CN116482551B - Calibration methods, measurement methods, systems, equipment and media for short circuits in modules - Google Patents

Abstract

The invention discloses a calibration method, measurement method, system, equipment and medium for short circuit in a module. The calibration method includes: setting a preset simulated short-circuit current in a battery module, and obtaining the charging and discharging conditions of the battery module. The voltage value during the cycle; the calibration standard of the battery module is determined according to the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current. This calibration method sets a simulated short-circuit current in the battery module to simulate a short circuit in the cell, performs a charge and discharge cycle, and calculates the median value of the standard score of the cell voltage in the module during the charge and discharge process, as well as its increase with the number of cycles. Changing trend; by changing the simulated short-circuit current to change the severity of the short circuit in the simulated battery cell, the changing trend and slope are obtained, which are used as calibration standards. The detection speed is fast, and there is no need to leave the battery alone for a long time, and it does not need to be disassembled. The battery core is tested; in addition, the calibration results can be used on the same type of battery core, which is highly scalable.

Description

Calibration methods, measurement methods, systems, equipment and media for short circuits in modules

Technical Field

The present invention relates to the field of battery technology, and in particular to a calibration method, measurement method, system, equipment and medium for short circuit in a module.

Background technique

Currently, a large number of batteries are used in energy storage power stations and new energy vehicles. During the battery manufacturing process, there may be dust in the air environment or poor quality of the separator, which may cause the internal voltage of the lithium battery to change. A tiny short circuit occurs between cells or within a single cell. This short circuit will not directly burn the battery, but will reduce the performance of the cell in a short period of time (weeks or months), causing a certain cell to Or the entire battery pack is completely unusable.

If the battery micro-short circuit is not dealt with in time in the early stage, it may evolve into a battery short circuit. Once the battery short circuit occurs, it may be accompanied by combustion, explosion and other accidents, causing losses to people and property. For this kind of battery self-discharge phenomenon, if it can be discovered and dealt with in time, it can effectively avoid battery problems. Timely discovery of batteries with this situation is crucial, and timely warning can effectively avoid battery problems. There are no risks such as burning and explosion, and the safety performance is improved.

The current mainstream internal short circuit detection method is to let the battery stand for a long time. Since the micro-short circuit battery continues to self-discharge during the standing process, its voltage will decrease with the decrease of SOC (state of charge, state of charge). By measuring the voltage difference before and after it is left standing, and finding the corresponding SOC, the corresponding degree of internal short circuit can be found. However, the disadvantage of this method is that for LFP (LiFePO4, lithium iron phosphate) batteries, there is a voltage platform within a large SOC range. The battery needs to be left at constant temperature for 7 to 30 days and high-precision measurement equipment is used. Measure the voltage change due to internal short circuit. The measurement time is long and the equipment requirements are high.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defect in the prior art that the detection of internal short circuit in a battery requires the battery to be kept at a constant temperature for a long time, resulting in low detection efficiency, and to provide a calibration method, measurement method, system, equipment and medium for internal short circuit in a module.

The present invention solves the above technical problems through the following technical solutions:

The present invention provides a calibration method for short circuit in a battery module. The calibration method includes:

Set a preset simulated short-circuit current in the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle;

The calibration standard of the battery module is determined according to the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current.

Preferably, the step of setting a preset simulated short-circuit current in the battery module includes:

The preselected cells of the battery module are connected in parallel to an electronic load, and the discharge current of the electronic load is set to set the simulated short-circuit current.

Preferably, after the step of obtaining the voltage value of the battery module during the charge and discharge cycle, the calibration method further includes:

Charge the preselected battery cells individually to bring the preselected battery cells to a standard state;

Set different simulated short-circuit currents for the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle.

Preferably, the step of determining the calibration reference of the battery module according to the corresponding relationship between the rate of change of the voltage value and the simulated short-circuit current includes:

The standard score of each cell of the battery module is determined according to the voltage value; the standard score is used to characterize the discrete degree of the voltage value of each cell of the battery module during the charge and discharge cycle;

Determine the change rate of the median value of the standard score with the number of charge and discharge cycles based on the median value of the standard score of each battery cell during each charge and discharge cycle;

The calibration standard of the battery module is determined according to the corresponding relationship between the change rate and the simulated short-circuit current.

Preferably, the standard score is determined according to the following formula:

Z _score (t)=(V _i (t)-mean(t))/std(t);

Among them, Z _score (t) is the standard score of cell No. i at time t, V _i (t) is the voltage of cell No. i at time t, mean (t) is the average voltage of all cells at time t, std (t) is the voltage standard deviation of all cells at time t.

Preferably, the step of determining the change rate of the median value of the standard score with the number of cycles based on the median value of the standard score of each battery cell during each charge and discharge cycle includes:

Determine the slope of the median value of the standard score as a function of the number of cycles according to the standard box diagram of each battery cell;

The step of determining the calibration reference of the battery module based on the corresponding relationship between the change rate and the simulated short-circuit current includes:

The calibration reference curve of each cell of the battery module is determined according to the corresponding relationship between the slope and the simulated short-circuit current.

Preferably, the step of obtaining the voltage value of the battery module during the charge and discharge cycle includes:

Obtain the charging voltage value of the battery module during the charge and discharge cycle.

The present invention also provides a method for measuring short circuit in a battery module, the method comprising:

Obtain the voltage value of the battery module under test during the charge and discharge cycle;

The short-circuit current of the battery module is determined based on the change rate of the voltage value and the calibration standard obtained by using the calibration method of the short circuit in the battery module as described above.

The invention also provides a calibration system for short circuit in the battery module. The calibration system includes:

A short-circuit state simulation module is used to set a preset simulated short-circuit current in the battery module and obtain the voltage value of the battery module during the charge and discharge cycle;

A calibration reference determination module is configured to determine the calibration reference of the battery module based on the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current.

Preferably, the short-circuit state simulation module is specifically configured to connect the preselected cells of the battery module to an electronic load in parallel, and set the discharge current of the electronic load to set the simulated short-circuit current.

Preferably, the calibration system also includes:

A battery cell charging module, used to charge the preselected battery cells individually so that the preselected battery cells reach a standard state;

The short-circuit state simulation module is specifically used to set different simulated short-circuit currents for the battery module and obtain the voltage value of the battery module during the charge and discharge cycle.

Preferably, the calibration reference determination module is specifically used to determine the standard score of each cell of the battery module according to the voltage value; the standard score is used to characterize the charging performance of each cell of the battery module. The degree of dispersion of voltage values during the discharge cycle;

The calibration reference determination module is specifically used to determine the change rate of the median value of the standard score with the number of charge and discharge cycles based on the median value of the standard score of each battery cell in each charge and discharge cycle;

The calibration reference determination module is specifically configured to determine the calibration reference of the battery module according to the corresponding relationship between the change rate and the simulated short-circuit current.

Preferably, the standard score is determined according to the following formula:

Z _score (t) = (V _i (t) - mean (t)) / std (t);

Among them, Z _score (t) is the standard score of cell No. i at time t, V _i (t) is the voltage of cell No. i at time t, mean (t) is the average voltage of all cells at time t, std (t) is the voltage standard deviation of all cells at time t.

Preferably, the calibration reference determination module is specifically used to determine the slope of the median value of the standard score changing with the number of cycles according to the standard box type diagram of each battery cell;

The calibration reference determination module is specifically configured to determine the calibration reference curve of each cell of the battery module according to the corresponding relationship between the slope and the simulated short-circuit current.

Preferably, the short circuit state simulation module is specifically used to obtain the charging voltage value of the battery module during the charge and discharge cycle.

The invention also provides a measurement system for short circuit in the battery module. The measurement system includes:

The charging voltage acquisition module is used to obtain the voltage value of the battery module under test during the charge and discharge cycle;

The short-circuit current determination module is configured to determine the short-circuit current of the battery module based on the change rate of the voltage value and the calibration standard obtained by using the calibration system for short circuit in the battery module as described above.

The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the short circuit in the battery module is realized as described above. The calibration method or the measurement method of short circuit in the battery module as mentioned above.

The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-described method for calibrating a short circuit in a battery module or the above-described method for calibrating a short circuit in a battery module is implemented. Short circuit measurement method.

The positive progressive effects of the present invention are:

The invention provides a calibration method and a measurement method for a short circuit in a battery module. By setting a simulated short-circuit current in the battery module to simulate a short circuit in the battery core, the charging and discharging cycle is performed, and the voltage standard of the battery core in the module is calculated during the charging and discharging process. The median value of the standard score, and its changing trend with the increase in the number of cycles; by changing the simulated short-circuit current to change the severity of the short circuit in the simulated battery core, the changing trend and slope of the median value of the standard score with the internal short-circuit self-discharge current are obtained , as the calibration standard. For new and uncalibrated batteries, subject them to charge and discharge cycles. According to the slope of the median standard score during the cycle and the calibration results, the degree of internal short circuit of the battery core can be obtained. Internally detecting micro-short circuit conditions in the battery can better prevent battery combustion and explosions. Compared with the existing technology, the detection speed is fast, the battery does not need to be left standing for a long time, and the battery core does not need to be disassembled for detection; in addition, the calibration results can be used on the same type of battery core, and the scalability is strong.

Description of drawings

In order to explain the technical solutions of the embodiments of this specification more clearly, the accompanying drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of this specification. For those of ordinary skill in the art, without exerting any creative efforts, this specification can also be applied to other applications based on these drawings. Other similar scenarios.

FIG. 1 is a first flowchart of a calibration method for a short circuit in a battery module in Embodiment 1 of the present invention.

FIG. 2 is a second flow chart of the calibration method for short circuit in the battery module in Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram showing the change of voltage of the battery module cells over time in Embodiment 1 of the present invention.

Figure 4 is a box diagram showing the change of the median standard score of the battery module cells with the number of charge and discharge cycles in Embodiment 1 of the present invention.

5 is a schematic diagram illustrating the corresponding relationship between the standard change rate of the battery module cells and the internal short-circuit current in Embodiment 1 of the present invention.

FIG. 6 is a schematic structural diagram of the calibration system for short circuit in the battery module in Embodiment 3 of the present invention.

FIG. 7 is a schematic structural diagram of an electronic device in Embodiment 5 of the present invention.

Detailed ways

The present invention is further described below by way of examples, but the present invention is not limited to the scope of the described examples.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places herein are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

It should be understood that the terms "system", "apparatus", "unit" and/or "module" as used herein are a means of distinguishing between different components, elements, parts, portions or assemblies at different levels. However, said words may be replaced by other expressions if they serve the same purpose.

As used herein, the words "a", "an", "an" and/or "the" do not exclusively refer to the singular and may include the plural unless the context clearly dictates an exception. Generally speaking, the terms "comprising" and "comprising" only imply the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

Definitions of inclusion herein, as used herein the terms “have,” “can have,” “include,” or “may include” indicate the presence of the corresponding functions, operations, elements, etc. herein, and do not limit the other one or The presence of multiple functions, operations, components, etc. Furthermore, it should be understood that the terms "comprising" or "having" as used herein indicate the presence of features, numbers, steps, operations, elements, components, or combinations thereof described in the specification without excluding one or more The presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

As used herein, the terms "A or B", "at least one of A and/or B" or "one or more of A and/or B" as used herein include the words recited therewith Any and all combinations of . For example, "A or B," "at least one of A and B," or "at least one of A or B" means (1) including at least one A, (2) including at least one B, or (3) including At least one A and at least one B both.

Flowcharts are used herein to illustrate the operations performed by the system according to the embodiments of this invention. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

Example 1

Please refer to FIG. 1 , which is a first flow chart of the calibration method for short circuit in the battery module in this embodiment. Specifically, as shown in Figure 1, the calibration method includes:

S101. Set a preset simulated short-circuit current in the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle;

S102. Determine the calibration standard of the battery module according to the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current.

Please refer to FIG2 , which is a second flow chart of the method for calibrating a short circuit in a battery module in this embodiment. Specifically, as shown in FIG2 , in an optional implementation, step S101 includes:

S1011. Connect the preselected cells of the battery module to the electronic load in parallel, and set the discharge current of the electronic load to set the simulated short-circuit current. Specifically, an electronic load can be connected in parallel with a cell in the battery module, and the electronic load can be set to discharge from the cell at a constant current as a micro short-circuit current. An external short circuit can simulate the capacity attenuation caused by an internal short circuit. Use charging and discharging equipment to cycle the battery module and record the cell voltage of each cell.

In this embodiment, step S101 includes:

S1012. Obtain the charging voltage value of the battery module during the charge and discharge cycle. Please refer to FIG. 3 , which is a schematic diagram of the voltage of the battery module cell changing with time in this embodiment. Specifically, as shown in Figure 3, at the starting point of the charging process, the voltage of each cell changes with time, and the difference is greater, that is, the lines in the solid line box in the figure are significantly different; when the charging ends and the discharging process begins, There is no distinction, that is, the lines in the dotted box in the figure basically overlap, and the distinction is not obvious. Therefore, it is preferable to obtain the charging voltage value of the battery module during the charge and discharge cycle.

In an optional implementation, after step S101, the calibration method further includes:

S201. Charge the preselected battery cells individually so that the preselected battery cells reach the standard state;

S202. Set different simulated short-circuit currents for the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle. Specifically, during the charge and discharge cycle, the micro-short-circuited battery core cannot reach the standard capacity of the battery core. The micro-short-circuited battery core needs to be recharged separately, and the power released due to the internal short circuit is charged with a small current to restore the battery. Mod consistency. Then change the size of the electronic load discharge current and repeat the above steps until multiple cell voltage data of micro short-circuit currents of different orders of magnitude are obtained.

In another optional implementation, step S102 includes:

S1021. Determine the standard score of each cell of the battery module based on the voltage value; the standard score is used to characterize the discrete degree of the voltage value of each cell of the battery module during the charge and discharge cycle;

Specifically, the standard score is determined according to the following formula:

Z _score (t)=(V _i (t)-mean(t))/std(t);

Among them, Z _score (t) is the standard score of cell No. i at time t, V _i (t) is the voltage of cell No. i at time t, mean (t) is the average voltage of all cells at time t, std (t) is the voltage standard deviation of all cells at time t.

S1022. Determine the change rate of the median value of the standard score with the number of charge and discharge cycles based on the median value of the standard score of each battery cell during each charge and discharge cycle;

S1023. Determine the calibration standard of the battery module according to the corresponding relationship between the change rate and the simulated short-circuit current.

In this embodiment, step S1022 includes: determining the slope of the median value of the standard score as a function of the number of cycles based on the standard score box plot of each cell;

Step S1023 includes: determining the calibration reference curve of each cell of the battery module according to the corresponding relationship between the slope and the simulated short-circuit current.

This is further explained below with specific examples. After connecting the battery module to the BMS (battery management system), choose to connect an electronic load in parallel with one of the cells, and set the electronic load to discharge from the cell at a constant current as a micro short-circuit current. Capacity fading caused by short circuit within the simulation. Use charge and discharge equipment to cycle charge and discharge the battery module, and record the cell voltage of each cell. Set the upper and lower voltage limits to [2.9, 3.5] V (volts), and charge and discharge with a current of 1C (coulomb). Cycle 20 times. As shown in Figure 3, the change of the cell voltage with time is measured. The micro-short-circuited cells are recharged separately, and the power released due to the internal short-circuit is charged with a small current to restore the consistency of the module. Then change the size of the electronic load discharge current and repeat the above steps until multiple cell voltage data of micro short-circuit currents of different orders of magnitude are obtained.

For the voltage during the advance charging process, the standard score Z_score(t) is calculated according to the above formula, and the standard score of all cells at all t times is calculated. According to the time spent in a single charge-discharge cycle, the standard score at the charging moment in a single charge-discharge cycle is extracted, and the median value Z_middle of the standard score during a single charge is calculated for each battery cell. And find the change of Z_middle with the number of cycles. As shown in Figure 4, the slope is k_c. Comparing the k_c values under different micro short-circuit currents, it is found that the internal short-circuit current I_isc and the slope k_c have an approximately linear relationship. As shown in Figure 5, use the measured data to draw the image of the slope k_c and the internal short-circuit current I_isc, which can be used as the calibration benchmark curve.

For the same type of battery module to be tested, charge and discharge for 5 cycles under the same conditions, and compare the slope k_c1 measured in the cycle with the calibrated slope k_c to obtain the corresponding internal short-circuit current I_isc. At the same time, the internal short-circuit level of the battery can be graded, and different measures can be taken for different levels. Thus, the corresponding internal short-circuit severity level can be obtained according to the obtained internal short-circuit current and corresponding measures can be taken.

This embodiment provides a calibration method for a short circuit within a battery module. By setting a simulated short circuit current in the battery module to simulate a short circuit within the cell, a charge and discharge cycle is performed, and the standard score of the cell voltage in the module is calculated during the charge and discharge process. The median value, and its changing trend as the number of cycles increases; by changing the simulated short-circuit current to change the severity of the short-circuit in the simulated battery core, the changing trend and slope of the standard median value with the internal short-circuit self-discharge current are obtained, so as to This serves as the calibration standard. For new and uncalibrated batteries, subject them to charge and discharge cycles. According to the slope of the median standard score during the cycle and the calibration results, the degree of internal short circuit of the battery core can be obtained. Internally detecting micro-short circuit conditions in the battery can better prevent battery combustion and explosions. Compared with the existing technology, the detection speed is fast, the battery does not need to be left standing for a long time, and the battery core does not need to be disassembled for detection; in addition, the calibration results can be used on the same type of battery core, and the scalability is strong.

Example 2

This embodiment provides a method for measuring a short circuit in a battery module, the method comprising:

Obtain the voltage value of the battery module under test during the charge and discharge cycle;

The short-circuit current of the battery module is determined based on the change rate of the voltage value and the calibration standard obtained by using the calibration method of short circuit in the battery module in Embodiment 1.

The calibration method for short circuit in a battery module provided in this embodiment determines the short circuit current of the battery module by utilizing the calibration reference obtained by the calibration method for short circuit in a battery module. Compared with the prior art, the detection speed is fast, the battery does not need to be left stationary for a long time, and the battery cells do not need to be disassembled for detection. In addition, the calibration reference is shared by battery cells of the same type, and the scalability is strong.

Example 3

Please refer to FIG. 6 , which is a schematic structural diagram of the calibration system for short circuit in the battery module in this embodiment. Specifically, as shown in Figure 6, the calibration system includes:

Short-circuit state simulation module 1 is used to set a preset simulated short-circuit current in the battery module and obtain the voltage value of the battery module during the charge and discharge cycle;

Specifically, the short circuit state simulation module is specifically used to obtain the charging voltage value of the battery module during the charge and discharge cycle.

The calibration reference determination module 2 is used to determine the calibration reference of the battery module according to the corresponding relationship between the rate of change of the voltage value and the simulated short-circuit current.

In an optional implementation, the short-circuit state simulation module is specifically configured to connect the preselected cells of the battery module to the electronic load in parallel, and set the discharge current of the electronic load to set the simulated short-circuit current.

In an optional embodiment, the calibration system further includes:

A battery cell charging module, used to charge the pre-selected battery cells individually so that the pre-selected battery cells reach a standard state;

The short-circuit state simulation module is specifically used to set different simulated short-circuit currents for the battery module and obtain the voltage value of the battery module during the charge and discharge cycle.

In an optional embodiment, the calibration reference determination module is specifically used to determine the standard score of each battery cell of the battery module according to the voltage value; the standard score is used to characterize the discrete degree of the voltage value of each battery cell of the battery module during the charge and discharge cycle;

The calibration reference determination module is specifically used to determine the change rate of the median value of the standard score with the number of charge and discharge cycles based on the median value of the standard score of each battery cell during each charge and discharge cycle;

The calibration reference determination module is specifically used to determine the calibration reference of the battery module based on the corresponding relationship between the change rate and the simulated short-circuit current.

Specifically, the standard score is determined according to the following formula:

Z _score (t)=(V _i (t)-mean(t))/std(t);

Among them, Z _score (t) is the standard score of cell No. i at time t, V _i (t) is the voltage of cell No. i at time t, mean (t) is the average voltage of all cells at time t, std (t) is the voltage standard deviation of all cells at time t.

In another optional implementation, the calibration reference determination module is specifically configured to determine the slope of the median value of the standard score as a function of the number of cycles based on the standard score box plot of each cell;

The calibration reference determination module is specifically used to determine the calibration reference curve of each cell of the battery module based on the corresponding relationship between the slope and the simulated short-circuit current.

The calibration system for short circuit in the battery module provided by this embodiment sets a simulated short circuit current in the battery module to simulate a short circuit in the cell, performs a charge and discharge cycle, and calculates the standard score of the cell voltage in the module during the charge and discharge process. The median value, and its changing trend as the number of cycles increases; by changing the simulated short-circuit current to change the severity of the short-circuit in the simulated battery core, the changing trend and slope of the standard median value with the internal short-circuit self-discharge current are obtained, so as to This serves as the calibration standard. For new and uncalibrated batteries, subject them to charge and discharge cycles. According to the slope of the median standard score during the cycle and the calibration results, the degree of internal short circuit of the battery core can be obtained. Internally detecting micro-short circuit conditions in the battery can better prevent battery combustion and explosions. Compared with the existing technology, the detection speed is fast, the battery does not need to be left standing for a long time, and the battery core does not need to be disassembled for detection; in addition, the calibration results can be used on the same type of battery core, and the scalability is strong.

Example 4

This embodiment also provides a measurement system for short circuit in the battery module. The measurement system includes:

The charging voltage acquisition module is used to obtain the voltage value of the battery module under test during the charge and discharge cycle;

The short-circuit current determination module is configured to determine the short-circuit current of the battery module based on the change rate of the voltage value and the calibration standard obtained by using the calibration system for short circuit in the battery module as described above.

The calibration system for short-circuit in the battery module provided by this embodiment determines the short-circuit current of the battery module by using the calibration benchmark obtained by the calibration system for short-circuit in the battery module. Compared with the existing technology, the detection speed is fast and there is no need to The battery can be left standing for a long time and does not need to be disassembled for testing; in addition, the same type of battery cells share a calibration benchmark, which is highly scalable.

Example 5

FIG7 is a schematic diagram of the structure of an electronic device provided in Example 5 of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the calibration method of the short circuit in the battery module of Example 1 or the measurement method of the short circuit in the battery module of Example 2 is implemented. The electronic device 30 shown in FIG7 is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

As shown in Fig. 7, the electronic device 30 may be in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 30 may include, but are not limited to: at least one processor 31, at least one memory 32, and a bus 33 connecting different system components (including the memory 32 and the processor 31).

Bus 33 includes a data bus, an address bus and a control bus.

The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and/or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

The memory 32 may also include a program/utility 325 having a set of (at least one) program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data. Each of the examples, or some combination thereof, may include the implementation of a network environment.

The processor 31 executes various functional applications and data processing by running computer programs stored in the memory 32, such as the calibration method for short circuit in the battery module in Embodiment 1 of the present invention or the short circuit in the battery module in Embodiment 2 of the present invention. Measurement methods.

Electronic device 30 may also communicate with one or more external devices 34 (eg, keyboard, pointing device, etc.). This communication may occur through the input/output (I/O) interface 35. Furthermore, the model generation device 30 may also communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN), and/or a public network, such as the Internet) through a network adapter 36 . As shown, network adapter 36 communicates with other modules of model-generated device 30 via bus 33 . It should be understood that, although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generated device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk Array) systems, tape drives, and data backup storage systems, etc.

It should be noted that although several units/modules or sub-units/modules of the electronic device are mentioned in the above detailed description, this division is only exemplary and not mandatory. Indeed, according to embodiments of the present invention, the features and functions of two or more units/modules described above may be embodied in one unit/module. Conversely, the features and functions of one unit/module described above may be further divided to be embodied by multiple units/modules.

Example 6

This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the calibration method of a short circuit in a battery module of Embodiment 1 or the calibration method of a short circuit in a battery module of Embodiment 2 is implemented. Short circuit measurement method.

Among them, the readable storage medium that can be used may more specifically include but is not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device or any of the above. The right combination.

In a possible implementation, the present invention can also be implemented in the form of a program product, which includes program code. When the program product is run on a terminal device, the program code is used to cause the terminal device to execute the implementation The calibration method of the short circuit in the battery module in Embodiment 1 or the measurement method of the short circuit in the battery module in Embodiment 2.

Among them, the program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be completely executed on the user device, partially executed on the user device, as an independent The software package executes partially on the user device, partially on the remote device, or entirely on the remote device.

Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (11)

1. A calibration method for short circuit in a battery module, characterized in that the calibration method includes: Set a preset simulated short-circuit current in the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle; Determine the calibration standard of the battery module according to the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current; The step of determining the calibration reference of the battery module based on the corresponding relationship between the change rate of the voltage value and the simulated short-circuit current includes: The standard score of each cell of the battery module is determined according to the voltage value; the standard score is used to characterize the discrete degree of the voltage value of each cell of the battery module during the charge and discharge cycle; Determine the rate of change of the median value of the standard score with the number of charge and discharge cycles according to the median value of the standard score of each battery cell during each charge and discharge cycle; The calibration standard of the battery module is determined according to the corresponding relationship between the change rate and the simulated short-circuit current. 2. The calibration method according to claim 1, wherein the step of setting a preset simulated short-circuit current in the battery module includes: The preselected cells of the battery module are connected in parallel to an electronic load, and the discharge current of the electronic load is set to set the simulated short-circuit current. 3. The calibration method according to claim 2, wherein after the step of obtaining the voltage value of the battery module during the charge and discharge cycle, the calibration method further includes: Charge the preselected battery cells individually to bring the preselected battery cells to a standard state; Set different simulated short-circuit currents for the battery module, and obtain the voltage value of the battery module during the charge and discharge cycle. 4. The calibration method as claimed in claim 1, characterized in that the standard score is determined according to the following formula: Z _score (t)=(V _i (t)-mean(t))/std(t); Among them, Z _score (t) is the standard score of cell No. i at time t, V _i (t) is the voltage of cell No. i at time t, mean (t) is the average voltage of all cells at time t, std (t) is the voltage standard deviation of all cells at time t. 5. The calibration method according to claim 1 or 4, wherein the median value of the standard score is determined according to the median value of the standard score of each battery core during each charge and discharge cycle. The steps for rate of change of turns include: Determine the slope of the median value of the standard score as a function of the number of cycles based on the standard score box plot of each cell; The step of determining the calibration reference of the battery module based on the corresponding relationship between the change rate and the simulated short-circuit current includes: The calibration reference curve of each cell of the battery module is determined according to the corresponding relationship between the slope and the simulated short-circuit current. 6. The calibration method according to any one of claims 1 to 5, wherein the step of obtaining the voltage value of the battery module during the charge and discharge cycle includes: Obtain the charging voltage value of the battery module during the charge and discharge cycle. 7. A method of measuring short circuit in a battery module, characterized in that the measuring method includes: Obtain the voltage value of the battery module under test during the charge and discharge cycle; The short-circuit current of the battery module is determined based on the change rate of the voltage value and the calibration standard obtained by using the calibration method for short circuit in the battery module according to any one of claims 1-6. 8. A calibration system for short circuit in a battery module, characterized in that the calibration system includes: A short-circuit state simulation module, used to set a preset simulated short-circuit current in the battery module and obtain the voltage value of the battery module during the charge and discharge cycle; A calibration reference determination module, used to determine a calibration reference of the battery module according to a corresponding relationship between a rate of change of the voltage value and the simulated short-circuit current; The calibration reference determination module is also used to determine the standard score of each cell of the battery module according to the voltage value; the standard score is used to characterize the charging and discharging cycle of each cell of the battery module. The degree of dispersion of voltage values during the process; the change rate of the median value of the standard score with the number of charge and discharge cycles is determined based on the median value of the standard score of each battery cell during each charge and discharge cycle; based on the change The corresponding relationship between the rate and the simulated short-circuit current determines the calibration standard of the battery module. 9. A measurement system for short circuit in a battery module, characterized in that the measurement system includes: The charging voltage acquisition module is used to obtain the voltage value of the battery module under test during the charge and discharge cycle; A short-circuit current determination module is configured to determine the short-circuit current of the battery module based on the change rate of the voltage value and the calibration standard obtained by using the calibration system for short circuits in the battery module as claimed in claim 8 . 10. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for calibrating the short circuit within the battery module as described in any one of claims 1 to 6 or the method for measuring the short circuit within the battery module as described in claim 7 is implemented. 11. A computer-readable storage medium with a computer program stored thereon, characterized in that when the computer program is executed by a processor, the short circuit in the battery module according to any one of claims 1 to 6 is achieved. Calibration method or the method of measuring short circuit in the battery module as claimed in claim 7.