CN114509688A - Battery patrol device - Google Patents

Abstract

The invention relates to a battery inspection device. The battery inspection device includes: a load module, which is used to consume electric energy when connected to the output end of the battery; a voltage acquisition module, connected to the output end of the battery, used to collect the load voltage when the load module is connected to the output end of the battery, and also uses is used to collect the no-load voltage of the battery; the current acquisition module is used to collect the load current when the load module is connected to the output end of the battery; the processing module is used to collect the load current according to the no-load voltage, the load voltage and all The load current determines the internal resistance of the battery. By connecting the load module inside the battery inspection device, the battery inspection device can make it more convenient for the device to detect the internal resistance of the backup battery, thereby improving the daily inspection efficiency of the backup battery.

Description

Battery patrol device

technical field

The present invention relates to the technical field of power equipment, in particular to a battery inspection device.

Background technique

With the development of communication technology, the realization of automatic switching of power equipment is also vigorously promoted. Through a powerful communication network, various switchgear, ring network cabinets and other equipment are connected through the network, and these power equipment can be remotely controlled through the background control system. In daily use, the power supply of power equipment is changed from the AC voltage to the required DC voltage after being rectified and filtered, and then used by these power equipment. When the line fails, power failure or maintenance, there is no external power supply to use, and the backup battery built in the cabinet will be used as the power supply for power equipment. Due to the influence of product quality, use environment and other issues, the backup battery will have bad phenomena, resulting in that it cannot be used when the backup power supply is required, and the power equipment cannot be used normally. Therefore, during the maintenance of power equipment, it is necessary to test the performance of the backup battery to ensure that power is provided to the power equipment in the event of a line failure or power outage.

At present, most of the instruments and tools for battery testing are benchtop instruments or meters. Desktop testing instruments are inconvenient to carry during daily inspections of power equipment, and batteries cannot be removed from automated equipment for testing. Portable meters are mainly aimed at the development of large-capacity power starting batteries, and this type of meter needs an external load when detecting the internal resistance of the battery, which is not very convenient for the daily inspection of the backup battery of the power equipment.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a battery inspection device.

A battery inspection device, comprising:

a load module, configured to consume electric energy when the output end of the battery is connected;

a voltage acquisition module, connected to the output end of the battery, for collecting the load voltage when the load module is connected to the output end of the battery, and also for collecting the no-load voltage of the battery;

a current collection module, configured to collect load current when the load module is connected to the output end of the battery;

A processing module, configured to determine the internal resistance of the battery according to the no-load voltage, the load voltage and the load current.

In one embodiment, it also includes:

The converter unit is connected to the output end of the battery, and is used for converting the voltage of the battery into a preset working voltage, and providing the preset working voltage to the load module.

In one embodiment, the load module includes:

an adjustable load unit for consuming electrical energy when connected to the output end of the battery;

a control unit, connected to the output end of the converter unit, for outputting a control signal;

a switch unit, connected to the output end of the control unit, and connected to the output circuit of the battery in series with the adjustable load unit, for receiving the control signal and keeping on or off according to the control signal ;

The load adjustment unit is connected with the output end of the converter unit and the adjustable load unit, and is used for adjusting the load resistance value of the adjustable load unit.

In one embodiment, the adjustable load unit includes:

A first MOS transistor, the gate of the first MOS transistor is connected to the load adjustment unit, the source is connected to the switch unit through the current collection module, and the drain is connected to the output end of the battery.

In one embodiment, the control unit includes:

The NE555D time base integrated circuit is used to output the control signal.

In one embodiment, the switch unit includes:

A second MOS transistor, the drain of the second MOS transistor is grounded, the gate is connected to the output end of the control unit, and the source is connected to the adjustable load unit through the current acquisition module for receiving the control The control signal output by the unit is kept on or off according to the control signal.

In one of the embodiments, the load regulation unit includes:

a comparator unit, connected to the output end of the converter unit and the adjustable load unit, for outputting an adjustment signal, and the adjustment signal is used to adjust the load resistance of the adjustable load unit;

The voltage regulating unit is connected with the output end of the converter unit and the comparator unit, and is used for regulating the reference voltage of the comparator.

In one embodiment, the processing module includes:

The microprocessor is used to obtain the state of the battery according to the internal resistance of the battery and the standard internal resistance.

In one embodiment, it also includes:

A display module, connected with the output end of the microprocessor, is used for displaying the internal resistance of the battery and the state of the battery.

In one embodiment, it also includes:

The alarm module is connected with the output end of the microprocessor, and is used for alarming when the state of the battery is abnormal.

The load module consumes electric energy when it is connected to the output end of the battery and acts as a load. The voltage acquisition module is connected to the output terminal of the battery. When the load module is connected to the output terminal of the battery, that is, there is a load, the voltage acquisition module is used to acquire the load voltage, and the current acquisition module is used to acquire the load current. When the load module is not connected to the output terminal of the battery, that is, there is no load, the voltage acquisition module is used to collect the no-load voltage. The processing module is used for determining the internal resistance of the battery according to the no-load voltage, the load voltage and the load current. By connecting the load module inside the battery inspection device, it is more convenient for the device to detect the internal resistance of the backup battery, thereby improving the daily inspection efficiency of the backup battery.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the traditional technology, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the traditional technology. Obviously, the drawings in the following description are only the For some embodiments of the application, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a battery inspection device in one embodiment;

2 is a schematic structural diagram of a load module of a battery inspection device in another embodiment;

3 is a schematic structural diagram of an adjustable load unit of a battery patrol device in one embodiment;

4 is a schematic structural diagram of an adjustable load unit of a battery patrol device in another embodiment;

5 is a schematic structural diagram of a load adjustment unit of a battery patrol device in another embodiment;

FIG. 6 is a schematic structural diagram of a battery inspection device in another embodiment.

Detailed ways

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of this application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

It can be understood that the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between them.

As used herein, the singular forms "a," "an," and "the/the" can include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. designate the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more Possibilities of other features, integers, steps, operations, components, parts or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

As shown in FIG. 1 , a battery inspection device according to an embodiment includes a load module 100 , a voltage collection module 200 , a current collection module 300 and a processing module 400 . The load module 100 is used for consuming electric energy when the output terminal of the battery is connected. The voltage acquisition module 200 is connected to the output terminal of the battery, collects the load voltage when the load module 100 is connected to the output terminal of the battery, and collects the no-load voltage when the load module 100 is not connected to the output terminal of the battery, ie no load. The processing module 400 is configured to determine the internal resistance of the battery according to the no-load voltage and the load voltage collected by the voltage collection module 200 and the load current collected by the current collection module 300 .

The no-load voltage refers to the voltage of the battery when the load module 100 is not connected to the battery output terminal. The load voltage refers to the voltage of the load module 100 when the load module 100 is connected to the battery output terminal. The load current refers to the magnitude of the current flowing through the load module 100 when the load module 100 is connected to the battery output terminal. The internal resistance of the battery is the internal impedance of the battery, which is an important indicator that affects the performance of the battery.

When the load module 100 is not connected to the battery output terminal, that is, there is no load, the voltage collected by the voltage acquisition module 200 reflects the no-load voltage. When the load module 100 is connected to the battery output terminal, the voltage collected by the voltage collection module 200 reflects the load voltage. In addition, the internal resistance of the battery and the load module 100 are connected in series, so the currents flowing through the internal resistance of the battery and the load module 100 are the same. Therefore, according to the battery voltage value (ie no-load voltage) minus the voltage value across the load module 100 (ie the load voltage), the voltage value across the internal resistance of the battery can be obtained, and then according to Ohm's law: battery internal resistance = (no-load voltage - load voltage)/load current, the internal resistance of the battery can be calculated.

In one embodiment, the load module 100 changes the connection relationship with the battery output so that the voltage collection module 200 can collect the no-load voltage and the load voltage respectively, and the current collection module 300 collects the load current.

The processing module 400 determines the internal resistance value of the battery according to the no-load voltage, the load voltage and the load current. Therefore, by connecting the load module inside the battery inspection device, it is more convenient for the device to detect the internal resistance of the backup battery, thereby improving the daily inspection efficiency of the backup battery.

In one embodiment, the battery inspection device further includes a converter unit, the converter unit is connected to the output end of the battery for converting the voltage of the battery into a preset working voltage, and providing the preset working voltage to the load module 100 .

Wherein, the preset working voltage is the standard working voltage of each module in the battery inspection device, so it is determined by each module in the device.

In one embodiment, the converter unit is connected to the output terminal of the battery, and the load module 100 has a preset working voltage, that is, a standard working voltage, and the converter unit needs to convert the voltage value of the battery into the standard working voltage of the load module 100, for the load module 100 to operate normally. For example, the converter unit includes MC34063, which has a voltage input range of 2.5V-40V and an output voltage range of 1.25V-40V, which can be used for boost power converters and step-down power converters. The standard working voltage of the load module 100 is 12V. As a step-down power converter, the MC34063 can convert and output the voltage of the battery to 12V with only a few external devices, and provide the working voltage for the load module 100, which can achieve different Power supply connection between a power supply and modules with different voltage requirements. In other embodiments, the preset operating voltage includes 6V, so the converter unit can convert the power supply voltage to the preset operating voltage of 6V.

As shown in FIG. 2 , in one embodiment, the load module 100 of the battery inspection device includes: an adjustable load unit 102 , a control unit 104 , a switch unit 106 and a load adjustment unit 108 . The adjustable load unit 102 is used for consuming electric energy when the output end of the battery is connected, and its resistance value can be adjusted by the load adjustment unit 108 . The control unit 104 is connected to the output end of the converter unit for outputting a control signal. The switch unit 106 is connected to the output end of the control unit 104, and is connected to the output circuit of the battery in series with the adjustable load unit 102, for receiving the control signal, and keeping on or off according to the control signal.

The converter unit provides a stable working voltage for the control unit 104 and the load adjustment unit 108 , and the control unit 104 is used for sending a control signal to control the switching unit 106 to be turned on or off. If the switch unit 106 is in the on state, the adjustable load unit 102 is connected to the output end of the battery; if the switch unit 106 is in the off state, the adjustable load unit 102 is disconnected from the battery. The resistance value of the adjustable load unit 102 may be close to or the same as the internal resistance value of the battery. The load adjustment unit 108 is connected to the adjustable load unit 102 for adjusting the load resistance of the adjustable load unit 102 . In one embodiment, the load adjustment unit 108 may adjust the load resistance of the adjustable load unit 102 according to the change of the load current to keep the load current constant, and the adjustable load unit consumes power in a constant current mode.

As shown in FIG. 3 , in one embodiment, the adjustable load unit 102 of the battery inspection device includes a first MOS transistor Q1 . The gate of the first MOS transistor Q1 is connected to the load adjustment unit 108 , the source is connected to the switch unit 106 through the current acquisition module 300 , and the drain is connected to the output end of the battery.

When the switch unit 106 is in an on state, the first MOS transistor Q1 will be connected to the output end of the battery for consuming electric energy. At this time, the voltage acquisition module 200 will collect the load voltage, and the current acquisition module 300 will collect the load current. The transistor Q1 may be an NMOS transistor. The load adjustment unit 108 is used to adjust the load resistance value when the first MOS transistor Q1 is connected to the output end of the battery, so as to adjust the conduction depth of the first MOS transistor Q1, so that the first MOS transistor Q1 is connected to the output end of the battery when the first MOS transistor Q1 is connected to the output end of the battery. Power is consumed according to the conduction depth.

In one embodiment, as shown in FIG. 3 , the voltage acquisition module 200 includes a first resistor R1 and a second resistor R2 connected in series, wherein the first end of the first resistor R1 is connected to the output end of the battery, and the first resistor The second end of R1 is connected to the first end of the second resistor R2 , the second end of the second resistor R2 is grounded, and the node between the first resistor R1 and the second resistor R2 is connected to the processing module 400 . When the first MOS transistor Q1 is connected to the output end of the battery, the processing module 400 calculates the voltage across the first MOS transistor Q1, that is, the load voltage, according to the node signal between the first resistor R1 and the second resistor R2; When the output terminal of the battery is not connected, the processing module 400 calculates the battery voltage, that is, the no-load voltage, according to the node signal between the first resistor R1 and the second resistor R2.

In one embodiment, the control unit 104 in the battery inspection device includes an NE555D time base integrated circuit 110, and the NE555D time base integrated circuit 110 is used for outputting control signals.

Among them, the NE555D time-base integrated circuit 110 only needs simple resistors, capacitors, etc., to complete a specific oscillation delay effect, with high timing accuracy and good temperature stability, and its output terminal has a large supply current, which can directly drive a variety of Since the load is automatically controlled, the accuracy of controlling the switching unit 106 can be improved.

In one embodiment, the output end of the NE555D time base integrated circuit 110 is connected to the switch unit 106 for outputting a control signal to the switch unit 106 to control the turn-on or turn-off of the switch unit 106 in time. Specifically, whenever the key switch SB1 in the NE555D time base integrated circuit 110 is pressed, the output pin of the NE555D time base integrated circuit 110 will output a high level to control the switch unit 106 to be turned on. When the NE555D time base integrated circuit 110 At the end of the timing period, the output pin will output a low level to control the switch unit 106 to turn off. By regularly controlling the on or off of the switch unit 106, the access state of the load module 100 can be controlled more flexibly.

As shown in FIG. 3 , in one embodiment, the switch unit 106 of the battery inspection device includes a second MOS transistor Q2 , wherein the drain of the second MOS transistor Q2 is grounded, the gate is connected to the control unit 104 , and the source passes through the current acquisition module 300 Connected to the source of the adjustable load cell 102 . The second MOS transistor Q2 is used for receiving the control signal output by the control unit 104, and is kept on or off according to the control signal.

In one embodiment, the current collection module 300 includes a third resistor R3, a first end of the third resistor R3 is connected to the source of the first MOS transistor Q1, and a second end of the third resistor R3 is connected to the second MOS transistor source of the tube.

Please continue to refer to FIG. 3 , if the switch unit 106 is in the on state, the first MOS transistor Q1 is connected to the output end of the battery to consume power, and the first resistor R1 and the second resistor R3 of the voltage acquisition module 200 are connected in series to detect the first The load voltage across the MOS transistor Q1. If the switch unit 106 is in the off state, the first MOS transistor Q1 is disconnected from the battery. Since the resistances of the first resistor R1 and the second resistor R2 of the voltage acquisition module 200 are large, the internal resistance of the battery is small and can be ignored. , so the no-load voltage collected by the voltage collection module 200 can be regarded as the battery voltage. After the processing module 400 obtains the no-load voltage, the load voltage and the load current, the voltage across the internal resistance of the battery can be obtained by subtracting the voltage value across the load module 100 (ie the load voltage value) from the battery voltage value (ie the no-load voltage value) value. Then according to Ohm's law: battery internal resistance = (no-load voltage - load voltage) / load current, the internal resistance value of the battery can be calculated.

As shown in FIG. 4 , in one embodiment, a fourth resistor R4 may be connected between the gate of the first MOS transistor Q1 and the load adjustment unit 108 , and the fourth resistor R4 is used to limit the amount of electricity flowing through the first MOS transistor Q1 current, protect the first MOS transistor Q1 and prevent the current in the circuit from flowing backward to the output port of the load adjusting unit 108 . In another embodiment, the gate of the first MOS transistor Q1 may also be connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is grounded, and the fifth resistor R5 is a pull-down resistor for stabilizing the input The voltage of the first MOS transistor Q1.

As shown in FIG. 5 , in one embodiment, the load adjustment unit 108 of the battery inspection device includes: a comparator unit 602 and a voltage adjustment unit 604 . Specifically, the comparator unit 602 is connected to the output end of the converter unit and the adjustable load unit 102 for outputting an adjustment signal, and the adjustment signal is used to adjust the load resistance of the adjustable load unit 102 . The voltage adjusting unit 604 is connected to the output end of the converter unit and the comparator unit 602 , and is used for adjusting the load resistance value of the load module 100 by adjusting the reference voltage of the comparator unit 602 . By adjusting the load resistance value of the load module 100, the battery inspection device can accurately detect the internal resistance of the battery, thereby improving the detection efficiency of the battery inspection device. In this embodiment, the specific structures of the comparator unit 602 and the voltage regulating unit 604 are not limited in any way, as long as their functions can be realized.

In one embodiment, the comparator unit 602 includes an LM358, which includes two independent, high-gain, internal frequency-compensated dual operational amplifiers, which are suitable for a single power supply with a wide supply voltage range. The reverse input terminal of the LM358 inputs the voltage of the third resistor R3 in the current acquisition module 300, and the non-inverting input terminal of the LM358 inputs the reference voltage. The non-inverting input terminal is connected to the voltage regulating unit 604, and the voltage regulating unit 604 is used to adjust the conduction depth of the second MOS transistor Q2 connected to the output terminal of the comparator unit 602, thereby controlling the second MOS transistor Q2 to connect to the output terminal of the battery ability to consume electrical energy. If the voltage of the third resistor R3 is lower than the reference voltage, that is, the detection voltage input by the inverting input terminal of the LM358 is lower than the reference voltage of the non-inverting input terminal, the voltage regulating unit 604 increases the VGS of the first MOS transistor of the adjustable load unit 102 . When VGS is large to a certain extent, it will attract the electrons in the P substrate to form a conductive channel, which can realize that the detection voltage input by the inverting input terminal of LM358 is greater than or equal to the reference voltage of the non-inverting input terminal, that is, the current acquisition module 300 The collected load current is greater than or equal to the set current value.

In one embodiment, the processing module 400 in the battery inspection device includes a microprocessor, and the microprocessor is used to obtain the state of the battery according to the internal resistance and the standard internal resistance of the battery.

Specifically, the internal resistance of the battery is calculated and obtained according to the no-load voltage and the load voltage collected by the voltage collection module 200 and the load current collected by the current collection module 300 . The difference between the no-load voltage and the load voltage is approximately considered to be the voltage across the internal resistance of the battery. The current acquisition module 300 collects the load current. According to Ohm's law, the internal resistance of the battery=(no-load voltage-load voltage)/load current, The internal resistance of the battery can be calculated. The standard internal resistance of the battery can be set according to the factory information of the battery.

In one embodiment, the microprocessor is connected to the voltage acquisition module 200 and the current acquisition module 300 for acquiring no-load voltage, load voltage and load current. The microprocessor may be powered by an external power source, or may be connected to the output terminal of the conversion unit 500 and powered by the conversion unit 500 . After the microprocessor calculates the internal resistance of the battery according to the no-load voltage, load voltage and load current, the state of the battery can be judged by comparing the calculated internal resistance of the battery with the standard internal resistance. If the calculated internal resistance value of the battery is less than the standard internal resistance value, the battery state is excellent; if the battery internal resistance value is 0-20% higher than the standard internal resistance value, the battery state is good; if the battery internal resistance value is higher than 20-40% of the standard internal resistance value, the battery status is normal; if the battery internal resistance is higher than 40% of the standard internal resistance, the battery needs to be replaced. By accurately calculating the internal resistance value of the battery and comparing it with the standard internal resistance value, the state of the battery can be clearly understood and the battery can be replaced in time, which can effectively improve the accuracy and practicability of the battery inspection device.

As shown in FIG. 6 , in one embodiment, the battery inspection device further includes a display module 600. The display module 600 is connected to the output end of the microprocessor, and is used to display the internal resistance value of the battery and the state of the battery, which is convenient for the staff to know more clearly to understand the different states of the battery during the tour. This embodiment does not make any limitation on the specific structure of the display module 600, as long as its function can be realized. Alternatively, the display module 600 may be powered by an external power source, or may be connected to the output end of the transforming unit 500 and powered by the transforming unit 500 . In other embodiments, the display module 600 is further configured to display the no-load voltage value, the load voltage value and the load current value of the battery.

Please continue to refer to FIG. 6 , in one embodiment, the battery inspection device further includes an alarm module 700 , which is connected to the output end of the microprocessor and used for alarming when the state of the battery is abnormal. The abnormal state of the battery includes that the internal resistance of the battery is more than 40% higher than the standard internal resistance, and the alarm is used to remind the staff to replace the battery in time. Wherein, the alarm module 700 can realize the alarm by means of sound and light alarm. Optionally, the alarm module 700 can be powered by an external power supply, or can be connected to the output end of the transforming unit 500 and powered by the transforming unit 500 . This embodiment does not make any limitation on the specific structure of the alarm module 700, as long as its function can be realized.

In the description of this specification, reference to the description of the terms "some embodiments," "other embodiments," "ideal embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in the present specification. at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. A battery patrol apparatus, comprising:

the load module is used for consuming electric energy when the output end of the battery is connected;

the voltage acquisition module is connected with the output end of the battery, and is used for acquiring load voltage when the load module is connected to the output end of the battery and acquiring no-load voltage of the battery;

the current acquisition module is used for acquiring load current when the load module is connected to the output end of the battery;

and the processing module is used for determining the internal resistance of the battery according to the no-load voltage, the load voltage and the load current.

2. The battery patrol apparatus according to claim 1, further comprising:

and the converter unit is connected with the output end of the battery and used for converting the voltage of the battery into a preset working voltage and providing the preset working voltage for the load module.

3. The battery patrol apparatus according to claim 1, wherein the load module includes:

the adjustable load unit is used for consuming electric energy when the output end of the battery is connected;

the control unit is connected with the output end of the converter unit and used for outputting a control signal;

the switch unit is connected with the output end of the control unit, is connected with the adjustable load unit in series in an output loop of the battery, is used for receiving the control signal and keeps on or off according to the control signal;

and the load adjusting unit is connected with the output end of the converter unit and the adjustable load unit and is used for adjusting the load resistance value of the adjustable load unit.

4. The battery patrol apparatus according to claim 3, wherein the adjustable load unit comprises:

the grid electrode of the first MOS tube is connected with the load adjusting unit, the source electrode of the first MOS tube is connected with the switch unit through the current collecting module, and the drain electrode of the first MOS tube is connected with the output end of the battery.

5. The battery patrol apparatus according to claim 3, wherein the control unit includes:

and the NE555D time base integrated circuit is used for outputting the control signal.

6. The battery patrol apparatus according to claim 3, wherein the switch unit includes:

and the drain electrode of the second MOS tube is grounded, the grid electrode of the second MOS tube is connected with the output end of the control unit, and the source electrode of the second MOS tube is connected with the adjustable load unit through the current acquisition module and is used for receiving the control signal output by the control unit and keeping on or off according to the control signal.

7. The battery patrol apparatus according to claim 3, wherein the load adjustment unit includes:

the comparator unit is connected with the output end of the converter unit and the adjustable load unit and used for outputting an adjusting signal, and the adjusting signal is used for adjusting the load resistance value of the adjustable load unit;

and the voltage regulating unit is connected with the output end of the converter unit and the comparator unit and is used for regulating the reference voltage of the comparator.

8. The battery patrol apparatus according to claim 1, wherein the processing module comprises:

and the microprocessor is used for obtaining the state of the battery according to the internal resistance and the standard internal resistance of the battery.

9. The battery patrol apparatus according to claim 8, further comprising:

and the display module is connected with the output end of the microprocessor and used for displaying the internal resistance of the battery and the state of the battery.

10. The battery patrol apparatus according to claim 8, further comprising:

and the alarm module is connected with the output end of the microprocessor and used for giving an alarm when the state of the battery is abnormal.

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