CN117458668B

CN117458668B - Battery protection circuit, battery protection board and electronic equipment

Info

Publication number: CN117458668B
Application number: CN202311661795.6A
Authority: CN
Inventors: 邓旭同
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-12-06
Filing date: 2023-12-06
Publication date: 2024-05-24
Anticipated expiration: 2043-12-06
Also published as: CN117458668A

Abstract

The application discloses a battery protection circuit, a battery protection board and electronic equipment, and relates to the technical field of circuits. The battery protection circuit includes a switch module and a battery protection module. The first end of the switch module is connected with the negative electrode of the battery cell, and the second end of the switch module is connected with the negative electrode of the load of the electronic equipment. The input end of the battery protection module is connected with the positive electrode of the battery core and the positive electrode of the load, and the output end of the battery protection module is connected with the control end of the switch module. After the battery protection module and the battery core are assembled together, if the battery protection module detects that the input end of the battery protection module is powered down and powered up again, the control switch module is turned off. Therefore, after the battery core is privately replaced by a user, the battery core cannot supply power to a load in the electronic equipment through the switch module, so that the user can be prevented from privately replacing the battery core, and the potential safety hazard of the electronic equipment can be reduced.

Description

Battery protection circuit, battery protection board and electronic equipment

Technical Field

The present application relates to the field of circuit technologies, and in particular, to a battery protection circuit, a battery protection board, and an electronic device.

Background

Electronic devices such as cell phones, tablet computers, notebook computers, etc. typically include an energy storage unit. The energy storage unit has the function of storing electric energy and can supply power for other electronic devices in the electronic equipment.

In the related art, the energy storage unit includes a battery cell and a battery protection circuit. The battery cell is used for storing electric energy. The battery protection circuit is connected with the battery core. Generally, a battery protection circuit has an anti-counterfeiting function to prevent a user from privately replacing an energy storage unit to cause circuit abnormality.

However, in the related art, the anti-counterfeiting function of the battery protection circuit cannot prevent the user from privately replacing the battery cell, so that a certain potential safety hazard is also provided.

Disclosure of Invention

The application provides a battery protection circuit, a battery protection board and electronic equipment. The battery protection circuit is applied to electronic equipment, and can prevent users from privately replacing the battery core, so that potential safety hazards of the electronic equipment can be reduced. The technical scheme is as follows:

In a first aspect, a battery protection circuit is provided. The battery protection circuit is used for being assembled with the battery cell to form an energy storage unit. The energy storage unit is applied to the electronic equipment and is used for supplying power to a load in the electronic equipment. The battery protection circuit includes a switching module and a battery protection module.

The switch module has a first end, a second end, and a control end. The first end of the switch module is used for being connected with the negative electrode of the battery cell, the second end of the switch module is used for being connected with the negative electrode of the load, and the positive electrode of the battery cell is connected with the positive electrode of the load. Thus, the switch module can control whether the battery core supplies power to the load or not. That is, when the switch module is turned on, the battery cell supplies power to the load; when the switch module is turned off, the battery cell cannot supply power to the load.

The battery protection module has an input and an output. The input end of the battery protection module is used for being connected with the positive electrode of the battery core and the positive electrode of the load, and the output end of the battery protection module is connected with the control end of the switch module so as to control the on and off of the switch module. The battery protection module is used for: after the battery protection module and the battery core are assembled together, if the input end of the battery protection module is detected to be powered down and powered up again, the control switch module is turned off. Wherein, the input end power failure of the battery protection module means: the connection relation between the input end of the battery protection module and the positive electrode of the battery core is disconnected; the input end of the battery protection module is powered on: the input end of the battery protection module is connected with the positive electrode of the battery core. That is, after the battery protection module and the battery cell are assembled to form the energy storage unit, if the battery protection module detects that the connection relationship between the input end of the battery protection module and the positive electrode of the battery cell is disconnected and then reconnected, the battery protection module controls the switch module to be turned off, so that the battery cell cannot supply power to the load. Therefore, after the battery core is privately replaced by a user, the battery core cannot supply power to a load in the electronic equipment through the switch module, so that the user can be prevented from privately replacing the battery core, and the potential safety hazard of the electronic equipment can be reduced.

The structure and operation of the battery protection module in the battery protection circuit will be described from four possible embodiments.

In a first possible implementation, the battery protection module is specifically configured to: detecting the number of times of electrification of the input end of the battery protection module, and if the number of times of electrification of the input end of the battery protection module is larger than the preset number of times, controlling the switch module to be turned off. Wherein, the preset times meet the following requirements: when the battery protection module and the battery core are assembled together, the power-on frequency of the input end of the battery protection module is equal to the preset frequency.

In particular, in this possible implementation, the battery protection module may include a read-only memory and a processor. The read-only memory stores a computer program and a preset number of times. The communication end of the processor is connected with the memory to read the computer program and the preset times. The input end of the processor is used for being connected with the positive electrode of the battery cell and the positive electrode of the load so as to detect the power-on times of the battery protection module. The output end of the processor is connected with the control end of the switch module to control the on and off of the switch module. When the processor runs the computer program, the battery protection module can detect the power-on times of the input end of the battery protection module, and when the power-on times of the input end of the battery protection module are greater than the preset times, the switch module is controlled to be turned off.

In a second possible implementation, the battery protection module includes a register, and when the battery protection module is assembled with the battery cell and applied to the electronic device, the register has an initial value, and the value of the register changes when the input terminal of the battery protection module is powered down or powered up. The battery protection module is specifically used for: and reading the value of the register, and if the value of the register is not equal to the initial value, controlling the switch module to be turned off.

The load may include a system-level chip, and the communication end of the battery protection module is connected with the communication end of the system-level chip, so as to receive a preset communication signal transmitted to the battery protection module after the system-level chip is powered on for the first time, where the preset communication signal is used for writing an initial value into the register. That is, in this embodiment, the initial value in the register may be written into the register by the system on chip of the electronic device after the energy storage unit and the load are first assembled to form the electronic device.

In a third possible implementation, the battery protection module includes a fuse, a first resistor, a switching unit, and a detection control unit. The first end of the fuse is used for being connected with the positive electrode of the battery cell, and the second end of the fuse is connected with the first end of the first resistor. The second end of the first resistor is connected with the first end of the switch unit, and the second end of the switch unit is used for being connected with the ground wire.

The power end of the detection control unit is used for being connected with the positive electrode of the battery cell. The detection end of the detection control unit is connected with the second end of the fuse and the first end of the first resistor. The first output end of the detection control unit is connected with the control end of the switch module. The second output end of the detection control unit is connected with the control end of the switch unit.

The detection control unit is used for: detecting whether the fuse is disconnected when power is on; if the fuse is disconnected, the control switch module is turned off; if the fuse is not opened, the switch unit is controlled to be turned on so as to open the fuse.

Wherein the detection control unit includes: a second resistor, a third resistor and a processor. The first end of the second resistor is connected with the second end of the fuse and the first end of the first resistor. The second end of the second resistor is connected with the first end of the third resistor. The second end of the third resistor is used for being connected with the ground wire.

The power end of the processor is used for being connected with the positive electrode of the battery cell. The input end of the processor is connected with the second end of the second resistor and the first end of the third resistor. The first output end of the processor is connected with the control end of the switch module, and the second output end of the processor is connected with the control end of the switch unit.

The processor is used for: and detecting the voltage value of the third resistor when the power is on, and if the voltage value of the third resistor is not in the preset voltage range, determining that the fuse is disconnected and controlling the switch module to be turned off. If the voltage value of the third resistor is within the preset voltage range, the fuse is determined not to be disconnected, and the switch unit is controlled to be connected.

In a fourth possible implementation, the battery protection module includes a fuse, a first resistor, a switching unit, and a detection control unit. The first end of the fuse is used for being connected with the positive electrode of the battery cell, and the second end of the fuse is connected with the first end of the first resistor. The second end of the first resistor is connected with the first end of the switch unit, and the second end of the switch unit is used for being connected with the ground wire.

The detection control unit is used for: detecting the power-on times of the detection control unit; if the power-on times of the detection control unit are equal to the preset times, the control switch unit is controlled to be turned on so as to disconnect the fuse.

The detection control unit is also used for: detecting whether the fuse is disconnected when power is on; if the fuse is opened, the control switch module is turned off.

The battery protection circuit of the application is further developed below.

In some embodiments, the switch module includes a first switch and a second switch. The first end of the first switch is connected with the negative electrode of the battery cell. The second end of the first switch is connected with the first end of the second switch, and the second end of the second switch is used for being connected with the negative pole of the load.

The control end of the first switch and the control end of the second switch are connected with the output end of the battery protection module. The battery protection module is used for: after the battery protection module and the battery core are assembled together, if the input end of the battery protection module is detected to be powered down and powered up again, at least one of the first switch and the second switch is controlled to be turned off.

In some embodiments, the battery protection circuit further comprises: a thermistor. The first end of the thermistor is used for being connected with a load, and the second end of the thermistor is connected with the second end of the switch module. Thus, the load can detect the resistance value of the thermistor, so that the temperature of the energy storage unit can be determined according to the resistance value of the thermistor.

In some embodiments, the battery protection circuit further comprises: identity resistance. The first end of the identification resistor is used for being connected with a load, and the second end of the identification resistor is connected with the second end of the switch module, so that the load detects the resistance value of the identification resistor.

In some embodiments, the battery protection circuit further comprises: an identity identification chip. The identity identification chip stores an identity identification number, and is used for being connected with a load so that the load can read the identity identification number.

In a second aspect, there is provided a battery protection board comprising the battery protection circuit as in any one of the first aspects.

In a third aspect, an energy storage unit is provided that includes a battery cell and a battery protection plate. The battery protection board includes the battery protection circuit according to any one of the first aspects.

In a fourth aspect, there is provided an electronic device including the battery protection circuit as in any one of the first aspects or the battery protection board in the second aspect or the energy storage unit in the third aspect.

The technical effects obtained by the second, third and fourth aspects are similar to the technical effects obtained by the corresponding technical means in the first aspect, and are not described in detail herein.

Drawings

FIG. 1 is a schematic view of the appearance of a first electronic device;

FIG. 2 is an external schematic view of a second electronic device;

fig. 3 is a schematic structural diagram of an energy storage unit of an electronic device;

FIG. 4 is a power block diagram of an electronic device;

Fig. 5 is a circuit configuration diagram of a first electronic device in the related art;

Fig. 6 is a circuit configuration diagram of a second electronic device in the related art;

fig. 7 is a circuit configuration diagram of a first electronic device according to an embodiment of the present application;

Fig. 8 is a circuit configuration diagram of a second electronic device according to an embodiment of the present application;

fig. 9 is a circuit configuration diagram of a third electronic device according to an embodiment of the present application;

Fig. 10 is a circuit configuration diagram of a fourth electronic device according to an embodiment of the present application;

Fig. 11 is a circuit configuration diagram of a fifth electronic device according to an embodiment of the present application;

Fig. 12 is a circuit configuration diagram of a detection control unit according to an embodiment of the present application;

fig. 13 is a circuit configuration diagram of a sixth electronic device according to an embodiment of the present application;

fig. 14 is a circuit configuration diagram of a seventh electronic device according to an embodiment of the present application.

Wherein, the meanings represented by the reference numerals are respectively as follows:

related technology:

10. An electronic device;

11. an energy storage unit;

1102. a conductive metal;

112. a battery cell;

113. a battery protection plate;

114. A battery protection circuit;

1142. a battery protection module;

1144. An identity identification chip;

12. A load;

122. A charge-discharge chip;

124. A temperature detection module;

126. An identity recognition module;

The application comprises the following steps:

20. A battery protection circuit;

210. A switch module;

220. a battery protection module;

222. A processor;

224. a memory;

226. A detection control unit;

228. a switching unit;

230. An identity identification chip;

30. an energy storage unit;

310. A battery cell;

40. An electronic device;

410. A load;

412. A charge-discharge chip;

414. A temperature detection module;

416. And an identity recognition module.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that references to "a plurality" in this disclosure refer to two or more. In the description of the present application, "/" means or, unless otherwise indicated, for example, A/B may represent A or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in order to facilitate the clear description of the technical solution of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and function. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

Before explaining the battery protection circuit provided by the embodiment of the application in detail, an application scenario and related technologies of the battery protection circuit are described.

The electronic device 10 includes a cell phone, tablet computer, notebook computer, etc. Fig. 1 and 2 are schematic external views of two different electronic devices 10. In the embodiment shown in fig. 1, the electronic device 10 is a mobile phone; in the embodiment shown in fig. 2, the electronic device 10 is a tablet computer. The electronic device 10 generally includes an energy storage unit 11. The energy storage unit 11 has the function of storing electrical energy and is capable of powering a load 12 in the electronic device 10. The load 12 in the electronic device 10 refers to other electronic components in the electronic device 10 than the energy storage unit 11.

Fig. 3 is a schematic diagram of the structure of the energy storage unit 11 of the electronic device 10. As shown in fig. 3, the energy storage unit 11 includes a battery cell 112 and a battery protection plate 113. The positive electrode and the negative electrode of the battery cell 112 are connected to the battery protection plate 113 through the conductive metal 1102. Wherein the battery 112 is used for storing electrical energy. The battery protection board 113 includes a battery protection circuit 114 and a package structure for packaging the battery protection circuit 114. As shown in fig. 4, the battery cell 112 is connected to the battery protection circuit 114 through a conductive metal 1102 (the conductive metal 1102 is shown as a wire in fig. 4) so that the battery cell 112 can supply power to the load 12 in the electronic device 10 through the battery protection circuit 114.

Since the battery 112 in the electronic device 10 is typically a lithium battery 112, there is a great safety hazard in the disassembly process, and the circuit and the load 12 in the electronic device 10 are easy to be abnormal. Therefore, in the related art, the battery protection circuit 114 generally has an anti-counterfeit function for preventing the user from privately disassembling and replacing the energy storage unit 11 which is not satisfactory.

The principle of the battery protection circuit 114 in the related art for implementing the anti-counterfeit function will be described from two different schemes.

Fig. 5 is a circuit configuration diagram of an electronic device 10 in the related art. As shown in fig. 5, in the first scheme, the battery protection circuit 114 includes a battery protection module 1142, a first switch Q1, a second switch Q2, a first resistor R1, and a second resistor R2. The load 12 of the electronic device 10 includes a motherboard and a System On Chip (SOC), a charge and discharge chip 122, a temperature detection module 124, and an identification module 126 located on the motherboard. The input terminal a of the battery protection module 1142 is connected to the positive electrode of the battery cell 112, and is connected to the first input terminal c of the charge/discharge chip 122 through a board-to-board (BTB) connector. The output terminal b of the battery protection module 1142 is connected to the control terminal of the first switch Q1 and the control terminal of the second switch Q2. The negative electrode of the battery cell 112 is connected to a first end of the first switch Q1, a second end of the first switch Q1 is connected to a first end of the second switch Q2, and a second end of the second switch Q2 is connected to a second input end d of the charge-discharge chip 122 through BTB. The output terminal e of the charge/discharge chip 122 is connected to the input terminal f of the SOC.

The first resistor R1 is a thermistor. The first end of the first resistor R1 is connected to the detection end g of the SOC through the temperature detection module 124, and the second end of the first resistor R1 is connected to the second end of the second switch Q2. The second resistor R2 is an Identity (ID) resistor. The first end of the second resistor R2 is connected to the detection end h of the charge-discharge chip 122 through the identity module 126. A second terminal of the second resistor R2 is connected to a second terminal of the second switch Q2.

When the electronic device 10 is operating, the battery protection module 1142 may detect the voltage value and the current value of the positive electrode of the battery 112, and determine whether the battery 112 is overcharged or overdischarged according to the voltage value and the current value. When it is determined that the battery cell 112 is overcharged or overdischarged, the battery protection module 1142 may control at least one of the first switch Q1 and the second switch Q2 to be turned off, and the battery cell 112 cannot be charged or discharged. When it is determined that the battery 112 is not overcharged or overdischarged, the battery protection module 1142 may control the first switch Q1 and the second switch Q2 to be turned on, and at this time, the battery 112 may be charged or discharged.

When the battery 112 discharges, the positive and negative electrodes of the battery 112 output electric energy to the first input terminal c and the second input terminal d of the charge-discharge chip 122, and at this time, the charge-discharge chip 122 may supply power to other devices (such as SOC, speaker, display screen, etc.) in the electronic device 10. The charge-discharge chip 122 has a function of step-up conversion or step-down conversion. The SOC may be preset with a correspondence between the resistance value related to the first resistor R1 and the temperature. When the SOC works, the resistance value of the first resistor R1 may be detected by the temperature detection module 124, and the temperature of the energy storage unit 11 may be obtained according to the resistance value of the first resistor R1 and a preset corresponding relationship.

The battery protection circuit 114 performs the anti-counterfeiting function by: the charge and discharge chip 122 may have a preset resistance range. When the charge and discharge chip 122 works, the resistance value of the second resistor R2 can be detected through the identity recognition module 126, so that the identity recognition is performed on the energy storage unit 11 according to the preset resistance value range and the resistance value of the second resistor R2. For example, when the resistance value of the second resistor R2 is within the preset resistance value range, the charge-discharge chip 122 determines that the energy storage unit 11 meets the requirement, that is, the identification is successful, and at this time, the charge-discharge chip 122 works to receive the electric energy output by the battery cell 112 and supply power to the SOC. When the resistance value of the second resistor R2 is not within the preset resistance value range (i.e., the user replaces the energy storage unit 11 that does not meet the requirements), the charge-discharge chip 122 determines that the energy storage unit 11 does not meet the requirements, i.e., the identification fails, and at this time, the charge-discharge chip 122 does not work, does not supply power to the SOC, and the electronic device 10 cannot be started.

Fig. 6 is a circuit configuration diagram of another electronic device 10 in the related art. As shown in fig. 6, in the second scheme, the second resistor R2 in the battery protection circuit 114 is replaced with the identification chip 1144 as compared with the first scheme. The identification chip 1144 may store therein an identification number uniquely corresponding to the energy storage unit 11. When the charge and discharge chip 122 works, the identification number stored in the identification chip 1144 can be read by the identification module 126 and identified. For example, when the read identification number meets the requirement, the identification is successful, and the SOC controls the charge-discharge chip 122 to operate. When the read identification number is not satisfactory (i.e. the user replaces the energy storage unit 11 which is not satisfactory) or the identification number is not read, the identification fails, and the SOC control charging and discharging chip 122 does not work.

However, in the related art shown in fig. 5 and 6, the anti-counterfeit function of the battery protection circuit 114 does not prevent the user from privately replacing the battery cells 112. That is, the anti-counterfeit function of the battery protection circuit 114 cannot prevent the user from shearing the conductive metal 1102 connected between the battery cell 112 and the battery protection plate 113 and replacing the battery cell 112, and thus has a certain safety hazard.

Therefore, the embodiment of the application provides a battery protection circuit, a battery protection board and electronic equipment. The battery protection circuit is applied to electronic equipment, and can prevent users from privately replacing the battery core, so that potential safety hazards of the electronic equipment can be reduced.

The battery protection circuit provided by the embodiment of the application is explained in detail below. The battery protection circuit provided by the embodiment of the application can be applied to electronic equipment, such as the electronic equipment 10 shown in fig. 1 and 2. In the embodiment of the present application, the connection between the two electronic devices or/and the electrical unit is electrical connection, where electrical connection refers to transmission of an electrical signal between the two electronic devices or/and the electrical unit through connection. In addition, the electrical connection between the two electronic devices or/and the electrical unit may be direct connection through a wire or may be indirect connection through other electronic devices or/and the electrical unit. In the embodiment of the present application, the reference numerals of the electronic devices are not used any more than those of the same electronic devices in the related art.

Fig. 7 is a circuit configuration diagram of an electronic device 40 according to an embodiment of the present application. As shown in fig. 7, the battery protection circuit 20 is used to form the energy storage unit 30 together with the battery cell 310. The energy storage unit 30 is applied to the electronic device 40 for powering a load 410 in the electronic device 40. The battery protection circuit 20 includes a switch module 210 and a battery protection module 220.

The switching module 210 is a three-terminal switching device. The switch module 210 has a first end a, a second end b, and a control end c. The control terminal c of the switch module 210 may control on and off between the first terminal a and the second terminal b of the switch module 210. The first terminal a of the switch module 210 is used for being connected with the negative electrode of the battery cell 310, the second terminal b of the switch module 210 is used for being connected with the negative electrode of the load 410, and the positive electrode of the battery cell 310 is used for being connected with the positive electrode of the load 410. In this manner, the switch module 210 may control whether the battery cell 310 supplies power to the load 410. That is, when the switch module 210 is turned on, the battery cell 310 supplies power to the load 410; when the switch module 210 is turned off, the battery cell 310 cannot supply power to the load 410. Wherein, the conduction of the switch module 210 refers to the conduction between the first end a and the second end b of the switch module 210; switching off the switching module 210 means switching off between the first end a and the second end b of the switching module 210.

The battery protection module 220 has an input d and an output e. The input terminal d of the battery protection module 220 is used for connecting with the positive electrode of the battery cell 310 and the positive electrode of the load 410. The input terminal d of the battery protection module 220 may be used as a power terminal of the battery protection module 220, that is, when the input terminal d of the battery protection module 220 inputs the operating voltage of the battery protection module 220, the battery protection module 220 is powered on; the input terminal d of the battery protection module 220 may also be used as a detection terminal for detecting the voltage value and the current value of the positive electrode of the battery cell 310. The output terminal e of the battery protection module 220 is connected to the control terminal c of the switch module 210, and is used for outputting a control signal to control the on/off of the switch module 210.

In an embodiment of the present application, the battery protection module 220 may be used to perform the following step S100.

S100, after the battery protection module 220 is assembled with the electric core 310, if it is detected that the input terminal d of the battery protection module 220 is powered down and powered up again, the control switch module 210 is turned off.

Specifically, the assembly of the battery protection module 220 with the battery cells 310 refers to: the battery protection module 220 is connected with the battery cell 310 to form the energy storage unit 30, that is, the packaged energy storage unit 30 is completed. The power down of the input terminal d of the battery protection module 220 means: the connection between the input terminal d of the battery protection module 220 and the positive electrode of the battery cell 310 is disconnected. The power-up of the input terminal d of the battery protection module 220 means: the input terminal d of the battery protection module 220 is connected to the positive electrode of the battery cell 310 (or other voltage terminal having the same voltage value as the positive electrode of the battery cell 310). Thus, the input d of the battery protection module 220 is powered down and powered up again: the connection between the input d of the battery protection module 220 and the positive electrode of the cell 310 is disconnected and reconnected.

Based on this, step S100 specifically includes: after the battery protection module 220 is assembled with the battery cell 310 to form the energy storage unit 30, if the battery protection module 220 detects that the connection relationship between the input end d of the battery protection module 220 and the positive electrode of the battery cell 310 is disconnected and then reconnected, the battery protection module 220 controls the switch module 210 to be turned off, so that the battery cell 310 cannot supply power to the load 410. It is understood that in step S100, "the control switch module 210 is turned off" means that the control switch module 210 is permanently turned off. In this way, after the user privately replaces the battery cell 310, the battery cell 310 cannot supply power to the load 410 in the electronic device 40 through the switch module 210, which can prevent the user from privately replacing the battery cell 310, thereby reducing the potential safety hazard of the electronic device 40 and improving the safety of the electronic device 40.

It is understood that, in the embodiment of the present application, the battery protection module 220 is further configured to perform the following step S200.

S200, after the battery protection module 220 is assembled with the electric core 310, if the input end d of the battery protection module 220 is not detected to be powered down and powered up again, the switch module 210 is controlled to be turned on.

That is, after the battery protection module 220 and the battery cell 310 are assembled to form the energy storage unit 30, if the battery protection module 220 detects that the connection relationship between the input end d of the battery protection module 220 and the positive electrode of the battery cell 310 is not disconnected, the battery protection module 220 controls the switch module 210 to be turned on, so that the battery cell 310 can supply power to the load 410, and the load 410 works normally.

In the embodiment of the present application, the load 410 refers to other electronic devices that require input of electric energy to operate except for the battery protection circuit 20 in the electronic device 40 to which the battery protection circuit 20 is applied. For example, the load 410 may be an SOC, a speaker, a display screen, etc. in the electronic device 40. In some embodiments, the battery protection circuit 20 of the present application also has the function of preventing overcharging or overdischarging of the battery cell 310. Namely: when the battery protection module 220 executes the step S200, the input terminal d of the battery protection module 220 further detects the voltage value and the current value of the positive electrode of the battery cell 310, and determines whether the battery cell 310 is overcharged or overdischarged according to the voltage value and the current value. When the battery protection module 220 determines that the battery cell 310 is overcharged or overdischarged, the control switch module 210 is turned off, and the battery cell 310 cannot be charged or discharged.

For example, the battery protection module 220 is provided with a first voltage threshold and a second voltage threshold, the first voltage threshold being greater than the second voltage threshold. When the battery cell 310 is charged, the voltage value of the positive electrode of the battery cell 310 increases; when the cell 310 discharges, the voltage value of the positive electrode of the cell 310 decreases. The battery protection module 220 may detect a voltage value of the positive electrode of the battery cell 310 when the battery cell 310 is charged, and control the switch module 210 to be turned off when the voltage value of the positive electrode of the battery cell 310 is greater than or equal to the first voltage threshold value, so as to avoid overcharging the battery cell 310. The battery protection module 220 may detect a voltage value of the positive electrode of the battery cell 310 when the battery cell 310 discharges, and control the switch module 210 to turn off when the voltage value of the positive electrode of the battery cell 310 is less than or equal to the second voltage threshold value, so as to avoid overdischarge of the battery cell 310. It will be appreciated that the battery protection module 220 controls the switch module 210 to switch off during the process of preventing the battery cell 310 from being overcharged, not permanently, but only during the process of continuing to charge the battery cell 310. When the battery cell 310 starts to discharge, the battery protection module 220 controls the switch module 210 to conduct. Likewise, the battery protection module 220 controls the switch module 210 to be turned off during the process of preventing the battery cell 310 from being overdischarged, not permanently, but only during the process of continuing the discharging of the battery cell 310. When the electronic device 40 is connected to the charger and the battery cell 310 starts to charge, the battery protection module 220 controls the switch module 210 to be turned on.

It should be noted that, in the above embodiment, the battery cell 310 and the load 410 are introduced to describe the connection manner and the operation of the battery protection circuit 20 according to the embodiment of the present application for the sake of understanding. In fact, the battery protection circuit 20 does not include the battery cell 310 and the load 410. That is, the battery cell 310 and the load 410 are present as environmental elements with respect to the battery protection circuit 20, which should not be construed as limiting the battery protection circuit 20 provided by embodiments of the present application.

The structure and operation of the battery protection module 220 in the battery protection circuit 20 will be described from four possible embodiments with reference to the accompanying drawings.

1. In a first possible implementation, the battery protection module 220 stores a preset number of times. The preset times meet the following requirements: when the battery protection module 220 is assembled with the battery cell 310, the number of times of power-up of the input terminal d of the battery protection module 220 is equal to a preset number of times.

In this case, the step S100 performed by the battery protection module 220 may be specifically the following step S110.

S110, the battery protection module 220 detects the number of times of power-up of the input end d of the battery protection module 220, and if the number of times of power-up is greater than the preset number of times, the switch module 210 is controlled to be turned off.

The step S200 performed by the battery protection module 220 may specifically be the following step S210.

S210, the battery protection module 220 detects the power-on times of the input end d of the battery protection module 220, and if the power-on times are less than or equal to the preset times, the switch module 210 is controlled to be turned on.

Specifically, the input d of the battery protection module 220 may be powered up N times during the production of the battery protection module 220 and the battery protection circuit 20 before the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30. Here, N is a positive integer, for example, N may be 5, 7 or 10, which is not limited herein. After the battery protection circuit 20 is produced, the input terminal d of the battery protection module 220 is powered up once again when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30. That is, when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30, the input terminal d of the battery protection module 220 is powered up n+1 times. The preset number of times is equal to n+1.

The battery protection module 220 detects the number of times of power-up of the input terminal d of the battery protection module 220 when executing steps S110 and S210. Since the user replaces the battery cell 310, the connection relationship between the battery cell 310 and the battery protection circuit 20 is cut off, and a new battery cell 310 is reconnected to the battery protection circuit 20. Therefore, after the user replaces the battery cell 310, when the battery protection module 220 is powered on, it will be detected that the number of times the input terminal d is powered on is increased by one, and at this time, the input terminal d of the battery protection module 220 is powered on n+2 times, which is greater than the preset number of times. In this case, the battery protection module 220 controls the switching module 210 to be permanently turned off so that the battery cell 310 cannot supply power to the load 410. Otherwise, before the user replaces the battery cell 310, the input terminal d of the battery protection module 220 is powered on n+1 times, which is equal to the preset number of times. In this case, the battery protection module 220 controls the switch module 210 to be turned on, so that the battery cell 310 can supply power to the load 410.

In this possible implementation, as shown in fig. 8, the battery protection module 220 may include a memory 224 and a processor 222.

Specifically, the processor 222 has an input, an output, and a communication terminal f. The input terminal of the processor 222 is used for being connected with the positive electrode of the battery cell 310 and the positive electrode of the load 410 to detect the power-up frequency of the processor 222. The number of times the processor 222 is powered on is the number of times the battery protection module 220 is powered on. That is, the input terminal of the processor 222 is the input terminal d of the battery protection module 220. An output terminal of the processor 222 is connected to a control terminal of the switch module 210 to control on and off of the switch module 210. That is, the output terminal of the processor 222 is the output terminal e of the battery protection module 220. The communication terminal f of the processor 222 is connected to the memory 224.

The memory 224 stores a computer program and a predetermined number of times. The processor 222 may read the computer program and the preset number of times through the communication terminal f. The processor 222 may also run the computer program. The battery protection module 220 can perform the above steps S110 and S210 when the processor 222 runs the computer program. In some specific embodiments, to prevent the computer program and preset number of times stored in the memory 224 from being modified, the memory 224 may be a read only memory 224 (ROM).

2. In a second possible implementation, as shown in fig. 9, the battery protection module 220 includes a register, and when the battery protection module 220 is assembled with the battery cell 310 and applied to the electronic device 40, the register has an initial value, and the value of the register changes when the input terminal d of the battery protection module 220 is powered down or powered up.

In this case, the step S100 performed by the battery protection module 220 may be specifically the following step S120.

S120, the battery protection module 220 reads the value of the register, and if the value of the register is not equal to the initial value, the control switch module 210 is turned off.

The step S200 performed by the battery protection module 220 may specifically be the following step S220.

S220, the battery protection module 220 reads the value of the register, and if the value of the register is equal to the initial value, the control switch module 210 is turned on.

Specifically, the battery protection module 220 includes a register. The register may have an initial value when the battery protection module 220 is first assembled with the battery cell 310 and applied to the electronic device 40. The value stored in the register changes when the input d of the battery protection module 220 is powered down or powered up.

It will be appreciated that the register typically includes a plurality of capacitors. The principle of the register storing a "value" is to charge the capacitor. When a charge is stored in a capacitor, the capacitor is used to represent a value of "1"; when no charge is stored in a capacitor, the capacitor is used to represent a value of "0". In the present application, after the register stores the initial value, if the input terminal d of the battery protection module 220 is powered down or powered up, a change in the charge of the capacitor in the register, that is, a change in the value of the register is caused.

Based on this, when the battery protection module 220 operates, it can be determined whether the input terminal d of the battery protection module 220 is powered down and powered up again by reading the value of the register. When the value of the register is equal to the initial value, the battery protection module 220 determines that the input terminal d of the battery protection module 220 is not powered down and is powered up again, and at this time, the battery protection module 220 controls the switch module 210 to be turned on. When the value of the register is not equal to the initial value, the battery protection module 220 determines that the input terminal d of the battery protection module 220 is powered down and powered up again, and at this time, the battery protection module 220 controls the switch module 210 to be turned off.

In some possible embodiments, the initial value may be written to a register by one skilled in the art when battery protection module 220 is first assembled with cell 310.

In other possible embodiments, the initial value may be written to a register by the SOC of electronic device 40 after initial power-up.

Specifically, fig. 10 is a circuit configuration diagram of still another electronic device 40 according to an embodiment of the present application. As shown in fig. 10, the load 410 includes an SOC therein. The communication terminal g of the battery protection module 220 is used for connection with the communication terminal h of the SOC. The SOC is used to perform the following step S310.

S310, after the SOC is electrified for the first time, a preset communication signal is transmitted to the battery protection module 220 through the communication terminal h.

The preset communication signal is used for writing an initial value into the register. That is, after the battery protection module 220 is assembled with the battery cell 310 to form the energy storage unit 30, and the energy storage unit 30 and the load 410 are assembled for the first time to form the electronic device 40 (i.e. the load 410 is powered on for the first time), the SOC transmits a preset communication signal to the battery protection module 220 for writing an initial value in the register.

3. In a third possible implementation, as shown in fig. 11, the battery protection module 220 includes a FUSE, a first resistor R1, a switching unit 228, and a detection control unit 226.

Specifically, a first terminal of the FUSE is configured to be connected to the positive terminal of the cell 310. The second terminal of FUSE is connected to the first terminal of first resistor R1. The second terminal of the first resistor R1 is connected to the first terminal n of the switching unit 228, and the second terminal p of the switching unit 228 is connected to the ground GND. The ground GND may be connected to the negative electrode of the cell 310.

The detection terminal i of the detection control unit 226 is connected to the second terminal of the FUSE and the first terminal of the first resistor R1, and is used for detecting whether the FUSE is turned off. The first output terminal j of the detection control unit 226 is connected to the control terminal c of the switch module 210, and is used for controlling on and off of the switch module 210. That is, the first output terminal j of the detection control unit 226 is the output terminal e of the battery protection module 220. The power terminal k of the detection control unit 226 is used for being connected with the positive electrode of the battery cell 310, so that the detection control unit 226 can be powered on. That is, the power supply terminal k of the detection control unit 226 and the first terminal of the FUSE together constitute the input terminal d of the battery protection module 220. The second output terminal m of the detection control unit 226 is connected to the control terminal q of the switch unit 228, for controlling the on and off of the switch unit 228. Typically, the switching unit 228 is a normally-off switch. I.e. the detection control unit 226 does not control the switching unit 228, the switching unit 228 is in an off state.

In this embodiment, the step S100 performed by the battery protection module 220 may specifically be the following step S130.

S130, the detection control unit 226 detects whether the FUSE is turned off when powered on, and if the FUSE is turned off, the control switch module 210 is turned off.

The step S200 performed by the battery protection module 220 may specifically be the following step S230.

S230, the detection control unit 226 detects whether the FUSE is turned off when being powered on, and if the FUSE is not turned off, the control switch module 210 is turned on; and, the control switch unit 228 is turned on to blow the FUSE.

The FUSE is provided in the battery protection circuit 20 when the battery protection circuit 20 and the battery cell 310 are assembled after the battery protection circuit 20 is manufactured.

Specifically, in this embodiment, the detection control unit 226 detects whether the primary FUSE is opened only at each power-up. In this case, when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30 for the first time, that is, when the battery protection circuit 20 is powered on for the first time (after the FUSE is installed), the detection control unit 226 detects that the FUSE is not opened, which indicates that the battery cell 310 in the energy storage unit 30 is not replaced. At this time, the detection control unit 226 may control the switch module 210 to be turned on, so that the battery cell 310 outputs the power to the load 410. At the same time, the detection control unit 226 also controls the switch unit 228 to close so as to blow the FUSE. Thus, when the detection control unit 226 is powered up next time, that is, when the battery protection circuit 20 (after the FUSE is installed) is assembled with the battery cell 310 for the second time to form the energy storage unit 30, the detection control unit 226 detects that the FUSE is disconnected, which indicates that the battery cell 310 in the energy storage unit 30 is replaced. At this time, the detection control unit 226 may control the switching module 210 to be turned off so that the battery cell 310 cannot output the power to the load 410.

In this embodiment, the FUSE is provided in the battery protection circuit 20 in preparation for assembling the battery protection circuit 20 and the battery cell 310 together after the battery protection circuit 20 is produced, for the purpose of: the FUSE is prevented from blowing before the battery protection circuit 20 and the battery cell 310 are assembled together for the first time to form the energy storage unit 30, i.e., during the production of the battery protection circuit 20.

Fig. 12 is a circuit configuration diagram of a detection control unit 226 according to an embodiment of the present application. As shown in fig. 12, in some embodiments, the detection control unit 226 includes a second resistor R2, a third resistor R3, and a processor.

Specifically, the first end of the second resistor R2 is connected to the second end of the FUSE and the first end of the first resistor R1. That is, the first end of the second resistor R2 is the detection end i of the detection control unit 226. The second end of the second resistor R2 is connected to the first end of the third resistor R3. The second end of the third resistor R3 is for connection to ground GND. The input end of the processor is connected with the second end of the second resistor R2 and the first end of the third resistor R3. A first output of the processor is connected to the control terminal c of the switch module 210. That is, the first output terminal of the processor is the first output terminal j of the detection control unit 226. The power terminal of the processor is configured to connect to the positive electrode of the battery cell 310 so that the processor can be powered up. That is, the power terminal of the processor is the power terminal k of the detection control unit 226. A second output of the processor is connected to a control terminal q of the switching unit 228. That is, the second output terminal of the processor is the second output terminal m of the detection control unit 226.

The processor may comprise an analog-to-digital converter or the like to detect the voltage value of the third resistor R3. In this case, step S130 may specifically be: the processor detects the voltage value of the third resistor R3, and if the voltage value of the third resistor R3 is not within the preset voltage range, the switch module 210 is controlled to be turned off.

The step S230 may specifically be: the processor detects the voltage value of the third resistor R3, and if the voltage value of the third resistor R3 is within the preset voltage range, the switch module 210 is controlled to be turned on; and, the control switch unit 228 is turned on to blow the FUSE.

Specifically, a preset voltage range is provided in the processor. The preset voltage range should include a voltage range in which the voltage value of the third resistor R3 is located when the FUSE is not turned off, and not include a voltage range in which the voltage value of the third resistor R3 is located when the FUSE is turned off. That is, the minimum value of the preset voltage range is less than or equal to the minimum voltage value of the third resistor R3 when the FUSE is not turned off; the maximum value of the preset voltage range is larger than or equal to the maximum voltage value of the third resistor R3 when the FUSE is not opened; and the voltage value of the third resistor R3 is not within the preset voltage range when the FUSE opens. For example, if the voltage value of the positive electrode of the battery cell 310 may be any voltage value between 3V (volts) and 4.5V, the voltage value of the negative electrode of the battery cell 310 and the voltage value of the ground GND are both 0, the resistance value of the second resistor R2 is equal to the resistance value of the third resistor R3, and the resistance value of the FUSE is negligible, then there are: when the FUSE is not opened, the minimum voltage value of the third resistor R3 is 1.5V, and the maximum voltage value of the third resistor R3 is 2.25V; when the FUSE is turned off, the voltage value of the third resistor R3 is 0. In this case, the preset voltage range should include a range of 1.5V to 2.25V, and not include 0. For example, the preset voltage range may be 1.5V to 2.25V, or 1V to 3V.

In this embodiment, the processor is operative to: detecting the voltage value of the third resistor R3, if the voltage value of the third resistor R3 is within the preset voltage range, determining that the FUSE is not disconnected, and controlling the switch module 210 to be turned on by the processor; and, the control switch unit 228 is turned on to blow the FUSE. If the voltage value of the third resistor R3 is not within the preset voltage range, it is determined that the FUSE is turned off, and the processor controls the switch module 210 to be turned off.

4. In a fourth possible implementation manner, the first possible implementation manner and the third possible implementation manner are combined, so that the working process of the detection control unit 226 in the third possible implementation manner is improved, so as to solve the defect that the FUSE in the third possible implementation manner needs to be "to be set in the battery protection circuit 20 when the battery protection circuit 20 and the electric cell 310 are assembled together after the production of the battery protection circuit 20 is completed".

In this embodiment, the circuit structure of the electronic device is still as shown in fig. 11, and will not be described again. The step S100 performed by the battery protection module 220 may specifically be the following step S140.

S140, the detection control unit 226 detects whether the FUSE is turned off when powered on, and if the FUSE is turned off, the control switch module 210 is turned off.

The step S200 performed by the battery protection module 220 may specifically be the following step S240.

S240, the detection control unit 226 detects whether the FUSE is turned off when powered on, and if the FUSE is not turned off, the control switch module 210 is turned on.

The battery protection module 220 also needs to perform the following step S001.

S001, the detection control unit 226 detects the number of times of powering up the detection control unit 226, and if the number of times of powering up the detection control unit 226 is equal to the preset number of times, the control switch unit 228 is turned on to blow the FUSE.

The FUSE is disposed in the battery protection circuit 20 when the battery protection circuit 20 starts to be produced.

Before the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30, the input terminal d of the battery protection module 220 may be powered up N times, that is, the detection control unit 226 may be powered up N times, during the production process of the battery protection module 220 and the battery protection circuit 20. Here, N is a positive integer, for example, N may be 5, 7 or 10, which is not limited herein. After the battery protection circuit 20 is produced, the input terminal d of the battery protection module 220 is powered up once again when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30. That is, when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30, the input terminal d of the battery protection module 220 is powered up n+1 times, that is, the detection control unit 226 is powered up n+1 times. The preset number of times is equal to n+1.

In this way, when the battery protection circuit 20 and the battery cell 310 are assembled together to form the energy storage unit 30, that is, when the detection control unit 226 is powered on for the n+1th time, on the one hand, the detection control unit 226 detects that the FUSE is not turned off, so as to control the switch module 210 to be turned on. On the other hand, the detection control unit 226 detects that the number of times of powering up the detection control unit 226 is equal to the preset number of times, so as to control the switch unit 228 to be turned on to blow the FUSE. Therefore, after the user replaces the battery cell 310, that is, when the detection control unit 226 is powered on for the n+2th time, the FUSE is detected to be turned off, so as to control the switch module 210 to be turned off.

It will be appreciated that the conditions under which the FUSE blows are typically: the continuous on-time of the switching unit 228 is greater than or equal to a preset time period. The preset time period depends on the specifications of the FUSE, and may be generally 5 seconds, 8 seconds, or 10 seconds. That is, when the detection control unit 226 is powered on for the n+1th time, the switch unit 228 needs to be controlled to be turned on for at least a preset period of time to blow the FUSE. Thus, the detection control unit 226 detects that the FUSE is not opened at the n+1th power-up.

In this embodiment, the circuit configuration of the detection control unit 226 is still as shown in fig. 12. The principle of detecting whether the FUSE is blown by the detection control unit 226 is the same as that in the third implementation manner, and will not be described again.

In the four possible implementations described above, the battery protection module 220 may be a field programmable gate array (field programmable GATE ARRAY, FPGA) chip or a complex programmable logic device (complex programmable logic device, CPLD).

The structure of the switch module 210 in the battery protection circuit 20 will be described with reference to the accompanying drawings.

Fig. 13 is a circuit configuration diagram of still another electronic device 40 according to an embodiment of the present application. As shown in fig. 13, in some embodiments, the switch module 210 includes a first switch Q1 and a second switch Q2. A first terminal of the first switch Q1 is connected to the negative electrode of the cell 310. That is, the first end of the first switch Q1 is the first end a of the switch module 210. The second terminal of the first switch Q1 is connected to the first terminal of the second switch Q2, and the second terminal of the second switch Q2 is connected to the negative electrode of the load 410. That is, the second end of the second switch Q2 is the second end b of the switch module 210. The control terminal of the first switch Q1 and the control terminal of the second switch Q2 are both connected to the output terminal e of the battery protection module 220. That is, the control terminal of the first switch Q1 and the control terminal of the second switch Q2 together constitute the control terminal c of the switch module 210.

Here, the battery protection module 220 is configured to: after the battery protection module 220 is assembled with the battery cell 310, if it is detected that the input terminal d of the battery protection module 220 is powered down and powered up again, at least one of the first switch Q1 and the second switch Q2 is controlled to be turned off.

Specifically, the first switch Q1 and the second switch Q2 may be field effect transistors (FIELD EFFECT transistors, FETs), such as metal oxide semiconductor field effect transistors (metal oxide semiconductor FIELD EFFECT transistors, MOSFETs). In this case, the first end and the second end of the switch (including the first switch Q1 and the second switch Q2) are the source electrode and the drain electrode of the MOSFET, and the control end of the switch is the gate electrode of the MOSFET. The first switch Q1 and the second switch Q2 are connected in series. As such, when both the first switch Q1 and the second switch Q2 are turned on, the switch module 210 is turned on; when at least one of the first and second switches Q1, Q2 is turned off, the switch module 210 is turned off.

It will be appreciated that in the embodiment shown in fig. 13, the output terminal e of the battery protection module 220 has only one port, and the control terminal of the first switch Q1 and the control terminal of the second switch Q2 are connected to the ports. In other embodiments, the output terminal e of the battery protection module 220 may also have two independent ports, and the control terminal of the first switch Q1 and the control terminal of the second switch Q2 are connected to the two ports one by one.

It will be appreciated that in the embodiment shown in fig. 13, the switch module 210 includes two switches, namely a first switch Q1 and a second switch Q2. In other embodiments, the switch module 210 may also include fewer or more switches. For example, the switch module 210 may include only the first switch Q1, or may include three switches, which is not limited herein.

The battery protection circuit 20 according to the embodiment of the present application is further extended below with reference to the accompanying drawings.

As also shown in fig. 13, in some embodiments, the battery protection circuit 20 further includes a fourth resistor R4. The fourth resistor R4 is a thermistor. For example, the fourth resistor R4 may be a negative temperature coefficient (negative temperature coefficient, NTC) thermistor. The first end of the fourth resistor R4 is used for being connected to the load 410, and the second end of the fourth resistor R4 is connected to the second end of the switch module 210. In this way, the load 410 can detect the resistance value of the thermistor, thereby controlling the temperature of the energy storage unit 30 according to the resistance value of the thermistor.

In this embodiment, the load 410 may include an SOC and temperature detection module 414. Wherein, a first end of the temperature detection module 414 is used for being connected with a first end of the fourth resistor R4, and a second end of the temperature detection module 414 is connected with the SOC. The SOC may be preset with a correspondence between the resistance value related to the fourth resistor R4 and the temperature. When the electronic device 40 works, the SOC may detect the resistance value of the fourth resistor R4 through the temperature detection module 414, and determine the temperature of the environment where the fourth resistor R4 is located, that is, the temperature of the energy storage unit 30, according to the corresponding relationship between the preset resistance value and the temperature of the fourth resistor R4.

As also shown in fig. 13, in some embodiments, the battery protection circuit 20 further includes a fifth resistor R5. The fifth resistor R5 is an identity mark resistor. The first end of the fifth resistor R5 is used for being connected to the load 410, and the second end of the fifth resistor R5 is connected to the second end of the switch module 210. In this way, the load 410 may detect the resistance of the fifth resistor R5, so as to determine whether the energy storage unit 30 is a satisfactory energy storage unit 30 according to the resistance of the fifth resistor R5.

In this embodiment, the load 410 may include therein an SOC and an identification module 416. The first end of the identity module 416 is connected to the first end of the fifth resistor R5, and the second end of the identity module 416 is connected to the SOC. The SOC may be preset with a resistance range for identifying the energy storage unit 30. When the electronic device 40 is in operation, the SOC can detect the resistance value of the fifth resistor R5 through the identification module 416. When the resistance value of the fifth resistor R5 is within the preset resistance value range, the SOC determines that the energy storage unit 30 is a satisfactory energy storage unit 30; when the resistance value of the fifth resistor R5 is not within the preset resistance value range, the SOC determines that the energy storage unit 30 is not the energy storage unit 30 that meets the requirement.

It will be appreciated that as shown in fig. 13, the load 410 may also include a charge-discharge chip 412. The first input end of the charge-discharge chip 412 is used for being connected with the positive electrode of the battery cell 310, the second input end of the charge-discharge chip 412 is used for being connected with the second end b of the switch module 210, and the output end of the charge-discharge chip 412 is connected with the SOC, so that the charge-discharge chip 412 can receive the electric energy output by the battery cell 310 and supply power to the SOC. In some possible embodiments, a second terminal of the temperature detection module 414 may also be connected to the charge-discharge chip 412. In this case, the correspondence between the resistance value related to the fourth resistor R4 and the temperature may be stored in the charge-discharge chip 412, and the detection of the temperature of the energy storage unit 30 is completed by the charge-discharge chip 412. Likewise, a second end of the identity module 416 may also be connected to the charge-discharge chip 412. In this case, the preset resistance range may be stored in the charge-discharge chip 412, and the identity recognition process of the energy storage unit 30 is completed by the charge-discharge chip 412.

In some embodiments, as shown in fig. 14, battery protection circuit 20 also includes an identification chip 230. The identification chip 230 stores therein an identification number uniquely corresponding to the energy storage unit 30. The identification chip 230 is used to connect with the load 410 so that the load 410 reads the identification number.

In this embodiment, the load 410 may include therein an SOC and an identification module 416. Wherein, a first end of the identity module 416 is used to connect with the identity chip 230, and a second end of the identity module 416 is connected with the SOC. In operation of electronic device 40, SOC may read the identification number stored in identification chip 230 via identification module 416. When the read identification number meets the requirement, the SOC can control the charge-discharge chip 412 to work, and the SOC works normally. When the read identification number does not meet the requirement or the identification number is not read, the identification fails, and the SOC control charge-discharge chip 412 does not work.

The embodiment of the present application also provides a battery protection board including the battery protection circuit 20 in any one of the embodiments described above. Here, the battery protection board may be a module that encapsulates the battery protection circuit 20 described above. That is, the battery protection board may include a package structure and the battery protection circuit 20 encapsulated by the package structure.

The embodiment of the application also provides an energy storage unit 30, which comprises a battery core 310 and a battery protection board. The battery protection board may be a module that encapsulates the battery protection circuit 20 described above.

The embodiment of the present application also provides an electronic device 40 including the battery protection circuit 20 as in any of the above embodiments, or the battery protection board as in the above embodiments, or the energy storage unit 30 as in the above embodiments.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A battery protection circuit, used to be assembled with a battery cell to form an energy storage unit, the energy storage unit is applied to electronic equipment, characterized in that the battery protection circuit comprises: a switch module and a battery protection module;

The first end of the switch module is used to connect to the negative electrode of the battery cell, and the second end of the switch module is used to connect to the negative electrode of the load of the electronic device; the input end of the battery protection module is used to connect to the positive electrode of the battery cell and the positive electrode of the load, and the output end of the battery protection module is connected to the control end of the switch module;

The battery protection module is used to: after the battery protection module is assembled with the battery cell, if it is detected that the input end of the battery protection module is powered off and then powered on again, control the switch module to turn off;

Wherein, the battery protection module includes a fuse, a first resistor, a switch unit and a detection control unit;

The first end of the fuse is used to be connected to the positive electrode of the battery cell, the second end of the fuse is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the switch unit, and the second end of the switch unit is used to be connected to the ground wire;

The power supply end of the detection control unit is used to be connected to the positive electrode of the battery cell; the detection end of the detection control unit is connected to the second end of the fuse and the first end of the first resistor, the first output end of the detection control unit is connected to the control end of the switch module, and the second output end of the detection control unit is connected to the control end of the switch unit;

The detection control unit is used to: detect the number of times the detection control unit is powered on; if the number of times the detection control unit is powered on is equal to a preset number, control the switch unit to be turned on so that the fuse is disconnected;

Wherein, the preset number of times meets the following requirement: when the battery protection module and the battery cell are assembled together, the number of times the input end of the battery protection module is powered on is equal to the preset number of times;

The detection control unit is also used to: detect whether the fuse is disconnected when power is turned on; if the fuse is disconnected, control the switch module to turn off.

2. The battery protection circuit according to claim 1, characterized in that the switch module comprises a first switch and a second switch;

The first end of the first switch is connected to the negative electrode of the battery cell, the second end of the first switch is connected to the first end of the second switch, and the second end of the second switch is used to be connected to the negative electrode of the load;

The control end of the first switch and the control end of the second switch are both connected to the output end of the battery protection module, and the battery protection module is used to: after the battery protection module and the battery cell are assembled together, if it is detected that the input end of the battery protection module is powered off and powered on again, control at least one of the first switch and the second switch to be turned off.

3. The battery protection circuit according to claim 1 or 2, characterized in that the battery protection circuit further comprises: a thermistor; a first end of the thermistor is used to be connected to the load, and a second end of the thermistor is connected to the second end of the switch module, so that the load detects the resistance value of the thermistor.

4. The battery protection circuit according to claim 1 or 2, characterized in that the battery protection circuit further comprises: an identification resistor; a first end of the identification resistor is used to be connected to the load, and a second end of the identification resistor is connected to the second end of the switch module, so that the load detects the resistance value of the identification resistor.

5. The battery protection circuit according to claim 1 or 2, characterized in that the battery protection circuit further comprises: an identity identification chip; the identity identification chip stores an identity identification number, and the identity identification chip is used to connect to the load so that the load reads the identity identification number.

6. A battery protection board, characterized by comprising the battery protection circuit according to any one of claims 1 to 5.

7. An electronic device, characterized in that it comprises a battery cell and a battery protection circuit as described in any one of claims 1 to 5 or a battery protection board as described in claim 6.