Battery thermal runaway test method, system, device, equipment and medium

Abstract

The invention discloses a battery thermal runaway test method, system, device and equipment and a medium, and the method comprises the steps: S1, obtaining the temperature of a battery module, processing the temperature of the battery module through employing a proportional-integral-differential control law according to the iteration temperature and the preset proportional gain, integral time and differential time, and obtaining the temperature of the battery module; a heating strategy of the battery module is obtained; s2, controlling the temperature of the battery module to be increased according to a preset first rate according to the heating strategy, sampling the temperature and voltage of the battery module according to a first period, and judging whether thermal runaway occurs in the battery module or not according to the temperature increasing rate of the battery module and the voltage decreasing rate of the battery module; controlling the battery module to stop heating when thermal runaway of the battery module occurs; and S3, increasing the iteration temperature according to the first rate, and returning to execute the S1 after each second period. According to the battery thermal runaway test method, the heating rate of the battery module has a linear characteristic, and the battery module is automatically controlled to stop heating.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery thermal runaway test method, system, device, equipment and medium. Background Art

[0002] As lithium batteries are increasingly used, their safety issues have become critical. Lithium batteries may experience thermal runaway under certain conditions, leading to fire or even explosion. Therefore, in-depth research on the thermal runaway characteristics of lithium batteries is crucial to improving product safety.

[0003] The traditional thermal runaway test scheme for lithium batteries usually controls the temperature rise by directly heating the lithium battery through a heating device, and determines whether the lithium battery has thermal runaway through the temperature curve. However, the traditional scheme has some obvious defects. First, due to the use of a fixed power to heat the lithium battery, the temperature rise rate of the lithium battery presents a nonlinear characteristic, making it difficult to accurately determine whether the lithium battery has thermal runaway. Secondly, when the lithium battery enters a thermal runaway state, heating needs to be stopped immediately to avoid further danger, but the traditional test scheme cannot automatically identify the thermal runaway phenomenon and turn off the heating source in time, and still relies on manual intervention to complete this process. In addition, for heating devices of different powers, the adaptability of the traditional test scheme is insufficient, resulting in the need to recalibrate each time the heating plate is replaced to ensure that the preset heating rate is achieved, which increases the complexity of the operation and the cost of testing.

[0004] These problems limit the accuracy and reliability of thermal runaway testing of lithium batteries and urgently need to be solved through technological innovation. Summary of the invention

[0005] In view of the above problems, the present application provides a battery thermal runaway test method, system, device, equipment and medium to solve the above technical problems.

[0006] In a first aspect, the present application provides a battery thermal runaway testing method, comprising:

[0007] Step S1: obtaining the temperature of the battery module, and processing the temperature of the battery module using a proportional-integral-differential control law according to the iterative temperature, a preset proportional gain, an integral time, and a differential time, so as to obtain a heating strategy for the battery module;

[0008] Step S2: according to the heating strategy, the temperature of the battery module is controlled to increase at a preset first rate, and the temperature and voltage of the battery module are sampled at a first period, and whether thermal runaway occurs in the battery module is determined according to the rising rate of the temperature of the battery module and the decreasing rate of the voltage of the battery module, and the battery module is controlled to stop heating when thermal runaway occurs in the battery module;

[0009] Step S3: increasing the iterative temperature at the first rate, and returning to execute step S1 after each second cycle;

[0010] Wherein, when the step S1 is initially executed, the iteration temperature is a preset initial temperature.

[0011] In a second aspect, the present application provides a battery thermal runaway test system, comprising: a sampling module, a main control module, a power module, a heating device and a battery module;

[0012] The sampling module is used to sample the temperature and voltage of the battery module according to a first cycle;

[0013] The main control module is used to receive the real-time temperature and real-time voltage of the battery module output by the sampling module in a first cycle, and process the temperature of the battery module according to the iterative temperature, the preset proportional gain, the integral time and the differential time by using the proportional integral differential control law every second cycle to obtain a heating strategy for the battery module;

[0014] The power module controls the heating device to heat the battery module according to the heating strategy of the battery module, so that the temperature of the battery module increases at a preset first rate.

[0015] In a third aspect, the present application provides a battery thermal runaway test device, comprising:

[0016] A power acquisition module is used to acquire the temperature of the battery module, and according to the iterative temperature, the temperature of the battery module is processed by a proportional-integral-differential control law according to a preset proportional gain, integral time and differential time, so as to obtain a heating strategy for the battery module;

[0017] A thermal runaway control module, configured to sample the temperature and voltage of the battery module according to a first cycle, and determine whether thermal runaway occurs in the battery module according to a rising rate of the temperature of the battery module and a falling rate of the voltage of the battery module;

[0018] If thermal runaway occurs in the battery module, the battery module is controlled to stop heating; otherwise, the temperature of the battery module is controlled to increase at a preset first rate according to the heating strategy;

[0019] A feedback module is used to increase the iteration temperature at the first rate, and control the power acquisition module to execute, after each second period: obtaining the temperature of the battery module, and processing the temperature of the battery module according to the iteration temperature, using a proportional-integral-differential control law according to a preset proportional gain, integral time, and differential time, so as to obtain a heating strategy for the battery module;

[0020] Wherein, when the power acquisition module is initially operated, the iteration temperature is a preset initial temperature.

[0021] In a fourth aspect, the present application provides an electronic device, including a memory and a processor, wherein:

[0022] The memory is used to store computer programs;

[0023] The processor is used to read the computer program in the memory and execute the steps of the battery thermal runaway test method as described in any one of the first aspects above.

[0024] In a fifth aspect, the present application provides a computer-readable storage medium having a readable computer program stored thereon, which, when executed by a processor, implements the steps of the battery thermal runaway test method as described in any one of the first aspects above.

[0025] The battery thermal runaway test method, system, device, equipment and medium provided by the present application, the battery thermal runaway test method uses a proportional-integral-differential control law to process the temperature of the battery module according to the iterative temperature, according to a preset proportional gain, integral time and differential time to obtain a heating strategy for the battery module, thereby achieving a linear increase in the temperature of the battery module at a preset first rate, and then when there is a deviation between the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, it can be more accurately judged whether the battery module has thermal runaway, so as to achieve automatic control of the battery module to stop heating; and the battery thermal runaway test method provided by the present application updates the iterative temperature at a preset first rate, reacquires the temperature of the battery module after each second cycle, and uses a proportional-integral-differential control law to process the temperature of the battery module according to the iterative temperature, according to a preset proportional gain, integral time and differential time to update the heating strategy of the battery module, thereby solving the problem that the heating strategy of the previous cycle is insufficient to control the linear temperature rise of the battery module due to the rise in the temperature of the battery module, thereby achieving real-time control of the heating rate of the battery module to present a linear characteristic. Based on the battery thermal runaway test method provided in the present application, the heating device of the battery module with different power can also be adaptively adjusted, and the heating device does not need to be calibrated when it is replaced, thereby reducing the operation complexity and testing cost.

[0026] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A flow chart of a battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0029] Figure 2 Another flow chart of the battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0030] Figure 3 Another flow chart of the battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0031] Figure 4 A flow chart showing step S1 of the battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0032] Figure 5 A flow chart of step S2 of the battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0033] Figure 6 Another flow chart of step S2 of the battery thermal runaway testing method provided in an embodiment of the present application is shown.

[0034] Figure 7 A schematic diagram of a battery thermal runaway testing system provided in an embodiment of the present application is shown.

[0035] Figure 8 A schematic diagram of a sampling module sampling battery module provided in an embodiment of the present application is shown.

[0036] Fig. 9 A schematic diagram of a battery thermal runaway testing device provided in an embodiment of the present application is shown.

[0037] Fig.10 A schematic diagram of an electronic device provided in an embodiment of the present application is shown.

[0038] Fig.11 A schematic diagram of a computer storage medium provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0040] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0041] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0042] It should be noted that, in the embodiments of the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0043] The present application provides a battery thermal runaway testing method. Figure 1 A flow chart of a battery thermal runaway test method provided in an embodiment of the present application is shown. Figure 1 As shown, the thermal runaway test method includes:

[0044] Step S1: Obtain the temperature of the battery module, and process the temperature of the battery module according to the iterative temperature, the preset proportional gain, the integral time and the differential time using the proportional-integral-differential control law to obtain a heating strategy for the battery module; optionally, when step S1 is initially executed, the iterative temperature is a preset initial temperature.

[0045] Step S2: According to the heating strategy, the temperature of the battery module is controlled to increase at a preset first rate, and the temperature and voltage of the battery module are sampled at a first period, and the battery module is judged whether thermal runaway occurs according to the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, and the battery module is controlled to stop heating when thermal runaway occurs. Optionally, when the battery module does not have thermal runaway, it will heat up at a first rate, at which time the voltage of the battery module will slowly decrease, and after thermal runaway occurs in the battery module, based on the characteristics of the lithium battery, the heating rate will be much higher than the preset first rate, and the voltage will also drop very quickly, so that the voltage drop rate of the battery module increases sharply. The embodiment of the present application judges whether thermal runaway occurs in the battery module based on this feature.

[0046] Step S3: Increase the iterative temperature at a first rate, and return to execute step S1 after each second cycle: obtain the temperature of the battery module, and according to the iterative temperature, use the proportional-integral-differential control law to process the temperature of the battery module according to the preset proportional gain, integral time and differential time to obtain a heating strategy for the battery module.

[0047] Among them, in the embodiment of the present application, there is no restriction on the time of the first cycle and the second cycle, but it is obvious that the time of the first cycle should be less than the second cycle to satisfy the battery thermal runaway test method provided in the above embodiment. In addition, the heating rate of the battery module is controlled by proportional gain, integral time and differential time. Specifically, the heating rate of the battery module is first rated to be the first rate, and then by setting the proportional gain, integral time and differential time, the obtained heating strategy can control the battery module to heat up at the first rate.

[0048] It can be understood that in the embodiment of the present application, when the heating rate of the battery module is determined by proportional gain, integral time and differential time, the values ​​of proportional gain, integral time and differential time can be calculated by simulating similar scenarios, or can be set according to empirical data, or can be obtained through multiple experiments, and the embodiment of the present application does not limit this.

[0049] The battery thermal runaway test method provided in the embodiment of the present application, according to the iterative temperature, uses the proportional-integral-differential control law to process the temperature of the battery module according to the preset proportional gain, integral time and differential time to obtain the heating strategy of the battery module, thereby realizing the temperature of the battery module being controlled to increase linearly according to the preset first rate, and then when there is a deviation between the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, it can be more accurately judged whether the battery module has thermal runaway, so as to realize automatic control of the battery module to stop heating; and the battery thermal runaway test method provided in the present application updates the iterative temperature according to the preset first rate, re-acquires the temperature of the battery module after each second cycle, and according to the iterative temperature, uses the proportional-integral-differential control law to process the temperature of the battery module according to the preset proportional gain, integral time and differential time to update the heating strategy of the battery module, which solves the problem that the heating strategy of the previous cycle is insufficient to control the linear temperature rise of the battery module due to the increase in the temperature of the battery module, thereby realizing the real-time control of the heating rate of the battery module to present a linear characteristic. Based on the battery thermal runaway test method provided in the present application, the heating device of the battery module with different power can also be adaptively adjusted, and the heating device does not need to be calibrated when it is replaced, thereby reducing the operation complexity and testing cost.

[0050] In some embodiments, Figure 2 Another flow chart of the battery thermal runaway test method provided in the embodiment of the present application is shown, Figure 2As shown, step S1: the step of obtaining the temperature of the battery module includes:

[0051] The temperature of the battery cell to be tested in the battery module is obtained, and the temperature of the battery module is processed according to the initial temperature, proportional gain, integral time and differential time using the proportional integral differential control law to obtain a heating strategy. Optionally, when actually performing a thermal failure test on a battery module, only one of the batteries in the battery module needs to be heated.

[0052] In some embodiments, Figure 3 Another flow chart of the battery thermal runaway test method provided in the embodiment of the present application is shown, Figure 3 As shown, step S1: the step of obtaining the temperature of the battery module also includes:

[0053] The temperature around at least one battery cell adjacent to the battery cell to be tested is obtained to obtain the temperature data of at least one battery cell in the battery module. Optionally, in the embodiment of the present application, the purpose of performing the battery thermal runaway test is to analyze the characteristic data during the battery thermal runaway test. Therefore, more temperature data can also be obtained by obtaining the temperature around at least one battery cell adjacent to the battery cell to be tested, so as to obtain more data for analysis after the battery thermal runaway test.

[0054] In some embodiments, Figure 4 The flowchart of step S1 of the battery thermal runaway test method provided in the embodiment of the present application is shown as follows: Figure 4 As shown, step S1: according to the iterative temperature, according to the preset proportional gain, integral time and differential time, the temperature of the battery module is processed by the proportional integral differential control law to obtain the heating strategy of the battery module, including:

[0055] The error temperature between the temperature of the battery module and the iteration temperature is obtained, that is, the error temperature = |iteration temperature - temperature|.

[0056] The error temperature is processed by using a continuous proportional-integral-differential control law according to a preset proportional gain, integral time and differential time to obtain a first output result.

[0057] The first output result is processed by using a discrete proportional integral differential control law to obtain a heating strategy, where the heating strategy is a heating voltage of the battery module or a heating power of the battery module.

[0058] Optionally, the continuous proportional-integral-derivative control law includes:

[0059]

[0060] Where, e(t) represents the error temperature, K p represents the proportional gain, T iIndicates the integration time, T d Indicates the derivative time.

[0061] The discrete proportional-integral-derivative control law includes:

[0062]

[0063] Wherein, u(k) represents the heating strategy, K p represents the proportional gain, T i Indicates the integration time, T d Denotes the differential time, T s Represents the sampling period, that is, the first period.

[0064] Among them, the heating strategy is the heating voltage of the battery module or the heating device of the battery module. Specifically, if the heating power supply heats the battery module through voltage control, the heating strategy is set to the heating voltage of the battery module so that the heating power supply outputs the voltage. If the heating power supply heats the battery pack through power control, the heating strategy is set to the heating power of the battery module so that the heating power supply outputs the power.

[0065] As an implementation mode, in the embodiment of the present application, the proportional gain is set to 7, the integral time is set to 0.4, and the differential time is set to 0.08. At this time, the sampling period, that is, the first period is 1S.

[0066] As an implementation mode, in the embodiment of the present application, the proportional gain is set to 7, the integral time is set to 2, and the differential time is set to 0.4. At this time, the sampling period, that is, the first period is 5S.

[0067] It can be understood that in the embodiments of the present application, the values ​​of the proportional gain, the integral time, the differential time and the sampling period are not limited to the above two implementation modes.

[0068] In some embodiments, Figure 5 The flowchart of step S2 of the battery thermal runaway test method provided in the embodiment of the present application is shown as follows: Figure 5 As shown, step S2: judging whether thermal runaway occurs in the battery module according to the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, comprises:

[0069] Determine whether the rising rate of the temperature of the battery module exceeds a preset second rate, and determine whether the falling rate of the voltage of the battery module exceeds a preset third rate,

[0070] If the rising rate of the temperature of the battery module exceeds the second rate, and / or the decreasing rate of the voltage of the battery module exceeds the third rate, it is determined that thermal runaway occurs in the battery module.

[0071] If the rising rate of the temperature of the battery module does not exceed the second rate, and the decreasing rate of the voltage of the battery module does not exceed the third rate, it is determined that thermal runaway does not occur in the battery module.

[0072] As an implementation mode, the second rate is set to 1°C / S and the third rate is set to 20mV / min. If the rising rate of the temperature of the battery module exceeds 1°C / S, and / or the decreasing rate of the voltage of the battery module exceeds 20mV / min, it is determined that thermal runaway occurs in the battery module.

[0073] It can be understood that in the embodiment of the present application, the setting values ​​of the second rate and the third rate are not limited to the above-mentioned implementation mode.

[0074] In some embodiments, Figure 6 Another flow chart of step S2 of the battery thermal runaway test method provided in the embodiment of the present application is shown, as Figure 6 As shown, before step S2: controlling the temperature of the battery module to increase at a preset first rate according to the heating strategy, the method further includes:

[0075] Determine whether the temperature of the heating device of the battery module reaches a preset upper temperature limit. If the temperature of the heating device reaches the preset upper temperature limit, control the battery module to stop heating. Otherwise, control the temperature of the battery module to increase at a preset first rate according to the heating strategy.

[0076] The heating device is used to control the temperature of the battery module to increase at a first rate according to a heating strategy.

[0077] In some embodiments, the heating device is a heating resistor wire.

[0078] The battery thermal runaway test method provided in the embodiment of the present application realizes the control of the linear temperature increase of the battery module. When there is a deviation between the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, it can more accurately determine whether the battery module has thermal runaway, thereby realizing automatic control of the battery module to stop heating; and the battery thermal runaway test method provided in the present application updates the heating strategy of the battery module at a preset first rate, which solves the problem that the heating strategy of the previous cycle is insufficient to control the linear temperature increase of the battery module due to the rise in the temperature of the battery module, thereby realizing real-time control of the heating rate of the battery module to present a linear characteristic. Based on the battery thermal runaway test method provided in the present application, the heating device of the battery module of different powers can also be adaptively adjusted, and the heating device does not need to be calibrated when replacing the heating device, thereby reducing the complexity of operation and testing costs.

[0079] Based on the above battery thermal runaway test method, the present application embodiment also provides a battery thermal runaway test system. Figure 7 A schematic diagram of a battery thermal runaway test system provided in an embodiment of the present application is shown. Figure 1 As shown, the battery thermal runaway test system includes: a sampling module, a main control module, a power module, a heating device and a battery module.

[0080] The sampling module is used to sample the temperature and voltage of the battery module according to the first cycle.

[0081] In some embodiments, the sampling module is a thermocouple voltage sampling circuit to sample the temperature and voltage of the battery module.

[0082] In some embodiments, Figure 8 A schematic diagram of a sampling module sampling battery module provided in an embodiment of the present application is shown. Figure 8 As shown, in the embodiment of the present application, the temperature (T3) and voltage (U1) of the battery cell to be tested are obtained through the sampling module, and the temperatures (T1, T2, T4, T5) around the two battery cells adjacent to the battery cell to be tested are obtained to obtain the temperature data and voltage data in the battery module.

[0083] The main control module is used to receive the real-time temperature and real-time voltage of the battery module output by the sampling module in the first cycle, and after each second cycle, according to the iterative temperature, according to the preset proportional gain, integral time and differential time, use the proportional integral differential control law to process the temperature of the battery module to obtain the heating strategy of the battery module.

[0084] In some embodiments, the main control module is a host computer / single-chip microcomputer / MCU and the like with processing functions to control the operation of the battery thermal runaway test system, such as setting the first cycle, the second cycle, the first rate, the upper temperature limit of the heating device, displaying the sampled voltage data and temperature data, etc.

[0085] The power module controls the heating device to heat the battery module according to the heating strategy of the battery module, so that the temperature of the battery module increases at a preset first rate.

[0086] For other details about the implementation of the above technical solution by each module in the above battery thermal runaway test system, please refer to the description of the battery thermal runaway test method provided in the above invention embodiment, which will not be repeated here.

[0087] Based on the above battery thermal runaway test method, the present application embodiment also provides a battery thermal runaway test device. Fig. 9 A schematic diagram of a battery thermal runaway test device provided in an embodiment of the present application is shown. Fig. 9 As shown, the battery thermal runaway test device includes:

[0088] The power acquisition module is used to obtain the temperature of the battery module. According to the iterative temperature, the proportional gain, integral time and differential time are preset, and the proportional integral differential control law is used to process the temperature of the battery module to obtain the heating strategy of the battery module.

[0089] The thermal runaway control module is used to control the temperature of the battery module to increase at a preset first rate according to the heating strategy, and to sample the temperature and voltage of the battery module according to the first period, and to determine whether the battery module has thermal runaway according to the rising rate of the temperature of the battery module and the decreasing rate of the voltage of the battery module, and to control the battery module to stop heating when thermal runaway occurs.

[0090] The feedback module is used to increase the iterative temperature at a first rate, and control the power acquisition module to execute after each second cycle: obtain the temperature of the battery module, and according to the iterative temperature, use the proportional-integral-differential control law to process the temperature of the battery module according to the preset proportional gain, integral time and differential time to obtain the heating strategy of the battery module.

[0091] When the power acquisition module is initially operated, the iteration temperature is a preset initial temperature.

[0092] For other details about how the modules in the battery thermal runaway test device implement the above technical solution, please refer to the description of the battery thermal runaway test method provided in the above invention embodiment, which will not be repeated here.

[0093] Based on the above battery thermal runaway test method, the embodiment of the present application also provides an electronic device, Fig.10 A schematic diagram of an electronic device provided by an embodiment of the present application is shown, Fig.10 As shown, the electronic device provided in the embodiment of the present application includes a processor 101 and a memory 102 coupled to the processor 101. The memory 102 stores a computer program, and when the computer program is executed by the processor 101, the processor 101 executes the steps of the battery thermal runaway test method in the above embodiment.

[0094] For other details about how the processor 101 in the electronic device implements the above technical solution, reference may be made to the description of the battery thermal runaway test method provided in the above invention embodiment, which will not be repeated here.

[0095] Among them, the processor 101 can also be called a CPU (Central Processing Unit), and the processor 101 may be an integrated circuit chip with signal processing capabilities; the processor 101 can also be a general-purpose processor, DSP (Digital Signal Process), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, among which the general-purpose processor can be a microprocessor or the processor 101 can also be any conventional processor, etc.

[0096] Based on the above-mentioned battery thermal runaway test method, the embodiment of the present application also provides a computer-readable storage medium, Fig.11 A schematic diagram of a computer storage medium provided in an embodiment of the present application is shown, Fig.11 As shown, the embodiment of the present application also provides a computer-readable storage medium, on which a readable computer program 111 is stored; wherein the computer program 111 can be stored in the above storage medium in the form of a software product, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, magnetic disk or optical disk, ROM (Read-Only Memory), RAM (Random Access Memory) and other media that can store program codes, or terminal devices such as computers, servers, mobile phones, and tablets.

[0097] The above contents are further detailed descriptions of the present application in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be regarded as the protection scope of the present application.

Claims

1. A battery thermal runaway test method, characterized in that: include: Step S1: obtaining the temperature of the battery module, and processing the temperature of the battery module using a proportional-integral-differential control law according to the iterative temperature, a preset proportional gain, an integral time, and a differential time, so as to obtain a heating strategy for the battery module; Step S2: controlling the temperature of the battery module to increase at a preset first rate according to the heating strategy, sampling the temperature and voltage of the battery module according to a first period, judging whether thermal runaway occurs in the battery module according to the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, and controlling the battery module to stop heating when thermal runaway occurs in the battery module; Step S3: increasing the iterative temperature at the first rate, and returning to execute step S1 after each second cycle; Wherein, when the step S1 is initially executed, the iteration temperature is a preset initial temperature.

2. The battery thermal runaway testing method according to claim 1, characterized in that: The step S1: obtaining the temperature of the battery module comprises: The temperature of the battery cell to be tested in the battery module is obtained, and the temperature of the battery module is processed according to the initial temperature, the proportional gain, the integral time and the differential time by using the proportional-integral-differential control law to obtain the heating strategy.

3. The battery thermal runaway testing method according to claim 2, characterized in that: The step S1: obtaining the temperature of the battery module, further comprises: The temperature around at least one battery cell adjacent to the battery cell to be tested is acquired to obtain temperature data of at least one battery cell in the battery module.

4. The battery thermal runaway testing method according to claim 1, characterized in that: The step S1: according to the iterative temperature, the temperature of the battery module is processed by a proportional-integral-differential control law according to a preset proportional gain, integral time and differential time to obtain a heating strategy for the battery module, including: Obtaining an error temperature between the temperature of the battery module and the iterative temperature; According to the preset proportional gain, integral time and differential time, the error temperature is processed by a continuous proportional integral differential control law to obtain a first output result; The first output result is processed by using a discrete proportional-integral-differential control law to obtain the heating strategy, where the heating strategy is a heating voltage of the battery module or a heating power of the battery module.

5. The battery thermal runaway testing method according to claim 1, characterized in that: The step S2: judging whether thermal runaway occurs in the battery module according to the rising rate of the temperature of the battery module and the falling rate of the voltage of the battery module, comprises: Determining whether a rising rate of the temperature of the battery module exceeds a preset second rate, and determining whether a falling rate of the voltage of the battery module exceeds a preset third rate; If the rising rate of the temperature of the battery module exceeds the second rate, and / or the decreasing rate of the voltage of the battery module exceeds the third rate, it is determined that thermal runaway occurs in the battery module; If the rising rate of the temperature of the battery module does not exceed the second rate, and the decreasing rate of the voltage of the battery module does not exceed the third rate, it is determined that thermal runaway does not occur in the battery module.

6. The battery thermal runaway testing method according to claim 1, characterized in that: Before the step S2 of controlling the temperature of the battery module to increase at a preset first rate according to the heating strategy, the method further includes: Determine whether the temperature of the heating device of the battery module reaches a preset upper temperature limit, if the temperature of the heating device reaches the preset upper temperature limit, control the battery module to stop heating, otherwise control the temperature of the battery module to increase at a preset first rate according to the heating strategy; The heating device is used to control the temperature of the battery module to increase at the first rate according to the heating strategy.

7. A battery thermal runaway test system, characterized in that: include: Sampling module, main control module, power module, heating device and battery module; The sampling module is used to sample the temperature and voltage of the battery module according to a first cycle; The main control module is used to receive the real-time temperature and real-time voltage of the battery module output by the sampling module in a first cycle, and process the temperature of the battery module according to the iterative temperature, the preset proportional gain, the integral time and the differential time by using the proportional integral differential control law every second cycle to obtain a heating strategy for the battery module; The power module controls the heating device to heat the battery module according to the heating strategy of the battery module, so that the temperature of the battery module increases at a preset first rate.

8. A battery thermal runaway test device, characterized in that: include: A power acquisition module is used to acquire the temperature of the battery module, and according to the iterative temperature, the temperature of the battery module is processed by a proportional-integral-differential control law according to a preset proportional gain, integral time and differential time, so as to obtain a heating strategy for the battery module; a thermal runaway control module, configured to control the temperature of the battery module to increase at a preset first rate according to the heating strategy, sample the temperature and voltage of the battery module at a first period, determine whether thermal runaway occurs in the battery module according to a rising rate of the temperature of the battery module and a falling rate of the voltage of the battery module, and control the battery module to stop heating when thermal runaway occurs in the battery module; A feedback module is used to increase the iteration temperature at the first rate, and control the power acquisition module to execute, after each second period: obtaining the temperature of the battery module, and processing the temperature of the battery module according to the iteration temperature, using a proportional-integral-differential control law according to a preset proportional gain, integral time, and differential time, so as to obtain a heating strategy for the battery module; Wherein, when the power acquisition module is initially operated, the iteration temperature is a preset initial temperature.

9. An electronic device, characterized in that: comprising a memory and a processor, wherein: The memory is used to store computer programs; The processor is used to read the computer program in the memory and execute the steps of the battery thermal runaway test method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: A readable computer program is stored thereon, and when the program is executed by a processor, the steps of the battery thermal runaway test method as claimed in any one of claims 1 to 6 are implemented.

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