Thermal diffusion protection grade evaluation method, device, equipment and storage medium

Abstract

The invention discloses a thermal diffusion protection grade evaluation method, device and equipment and a storage medium, and relates to the technical field of energy storage management. The thermal diffusion protection grade evaluation method comprises the steps of determining a safety grade, a control grade and a passing rate grade of a to-be-evaluated energy storage system; according to the security level, the control level, the passing rate level and a preset evaluation matrix, determining a thermal diffusion protection level of the to-be-evaluated energy storage system; wherein the preset evaluation matrix is used for representing a mapping relation among the security level, the control level, the passing rate level and the thermal diffusion protection level. According to the thermal diffusion protection level evaluation method provided by the invention, the thermal diffusion safety level, the control level and the passing rate level of the to-be-evaluated energy storage system can be determined, and the thermal diffusion protection level of the to-be-evaluated energy storage system can be comprehensively and quantitatively evaluated in combination with the preset evaluation matrix.

Description

Technical Field

[0001] The present application relates to the field of energy storage management technology, and specifically to a thermal diffusion protection level assessment method, device, equipment and storage medium. Background Art

[0002] In recent years, with the rapid development of the electric vehicle industry, the country has paid more and more attention to the safety of electric vehicles, especially the safety of energy storage systems in electric vehicles. Among the safety performance of energy storage systems, the protection performance of thermal diffusion is one of the key safety performances. At present, the evaluation of thermal diffusion protection level is mainly carried out around a single dimension, which makes it difficult to comprehensively evaluate the protection performance of energy storage systems. Summary of the invention

[0003] Purpose of the invention: The embodiments of the present application provide a thermal diffusion protection level assessment method, device, equipment and storage medium to achieve a comprehensive assessment of the protection level of an energy storage system.

[0004] Technical solution: A thermal diffusion protection level assessment method described in an embodiment of the present application is applied to assess the thermal diffusion protection level of an energy storage system. The method includes:

[0005] Determine the safety level, control level and pass rate level of the energy storage system to be evaluated;

[0006] Determining a thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, the control level, the pass rate level, and a preset evaluation matrix;

[0007] The preset evaluation matrix is ​​used to characterize the mapping relationship among the safety level, the control level, the pass rate level and the thermal diffusion protection level.

[0008] In some embodiments, a method for determining the thermal diffusion protection level of the energy storage system to be evaluated includes:

[0009] According to the safety level, determining the safety level position of the energy storage system to be evaluated from the preset evaluation matrix;

[0010] According to the safety level position, the control level, and the pass rate level of the energy storage system to be evaluated, determining the control level position and the pass rate level position of the energy storage system to be evaluated from the preset evaluation matrix;

[0011] According to the control level position and the pass rate level position of the energy storage system to be evaluated, the thermal diffusion protection level of the energy storage system to be evaluated is determined from the preset evaluation matrix.

[0012] In some embodiments, the method for determining the security level includes:

[0013] Obtaining safety status information of the energy storage system to be evaluated after the thermal diffusion test;

[0014] The safety level is determined according to the safety status information after the heat diffusion test and a first preset evaluation criterion.

[0015] In some embodiments, the safety status information includes thermal runaway occurrence information, thermal event signal triggering information after thermal runaway occurs, fire or explosion information of the energy storage system to be evaluated after thermal runaway occurs, and the interval time from the occurrence of thermal runaway to the fire or explosion of the energy storage system to be evaluated;

[0016] The step of determining the safety level according to the safety status information after the thermal diffusion test and a first preset evaluation criterion includes:

[0017] The safety level is determined based on the thermal runaway occurrence information, the thermal event signal triggering information, the fire or explosion information of the energy storage system to be evaluated, the interval time and the preset time threshold.

[0018] In some embodiments, the method for determining the control level includes:

[0019] Obtaining thermal runaway state information of the energy storage system to be evaluated after a thermal diffusion test;

[0020] The control level is determined according to the thermal runaway state information after the thermal diffusion test and a second preset evaluation criterion.

[0021] In some embodiments, the energy storage system to be evaluated includes a plurality of battery modules, the battery modules include battery cells, and isolation devices are provided between the plurality of battery cells; the thermal runaway state information includes thermal runaway occurrence information of the triggered battery cell, thermal runaway occurrence information of the battery module where the triggered battery cell is located, thermal runaway occurrence information of the battery modules around the triggered battery cell, thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and thermal runaway occurrence information of each of the isolation devices;

[0022] Determining the control level according to the thermal runaway state information after the thermal diffusion test and a second preset evaluation criterion includes:

[0023] Determine the thermal runaway occurrence range based on the thermal runaway occurrence information of the triggered cell, the thermal runaway occurrence information of the battery module where the triggered cell is located, the thermal runaway occurrence information of the battery modules around the triggered cell, the thermal runaway occurrence information of the cells in the battery modules around the triggered cell, and the thermal runaway occurrence information of each of the isolation devices;

[0024] The control level is determined based on the thermal runaway occurrence range.

[0025] In some embodiments, determining the pass rate level includes:

[0026] Obtaining sample pass rate information of the energy storage system to be evaluated after a thermal diffusion test;

[0027] The pass rate level is determined according to the sample pass rate information after the thermal diffusion test and a third preset evaluation criterion.

[0028] In some embodiments, the sample pass rate information includes the sample pass rate and the number of passed samples; the step of determining the pass rate level according to the sample pass rate information after the thermal diffusion test and a third preset evaluation criterion includes:

[0029] The pass rate level is determined based on the sample pass rate, the number of passed samples, a preset pass rate threshold and a preset number threshold.

[0030] In some embodiments, after determining the thermal diffusion protection level of the energy storage system to be evaluated, the method further includes:

[0031] An evaluation result of the thermal diffusion protection level of the energy storage system to be evaluated is determined according to the thermal diffusion protection level of the energy storage system to be evaluated and a fourth preset evaluation criterion.

[0032] Accordingly, the embodiment of the present application further provides a thermal diffusion protection level assessment device, comprising:

[0033] A first determination module is used to determine the safety level of the energy storage system to be evaluated;

[0034] A second determination module is used to determine the control level of the energy storage system to be evaluated;

[0035] The third determination module is used to determine the pass rate level of the energy storage system to be evaluated;

[0036] A fourth determination module, configured to determine a thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, the control level, the pass rate level, and a preset evaluation matrix;

[0037] The preset evaluation matrix is ​​used to characterize the mapping relationship among the safety level, the control level, the pass rate level and the thermal diffusion protection level.

[0038] Correspondingly, an embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the thermal diffusion protection level assessment method as described above when executing the computer program.

[0039] Correspondingly, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the thermal diffusion protection level assessment method as described above is implemented.

[0040] Beneficial effects: Compared with the prior art, the thermal diffusion protection level assessment method, device, equipment and storage medium of the embodiments of the present application, the thermal diffusion protection level assessment method is applied to assessing the thermal diffusion protection level of an energy storage system, the method comprising: determining the safety level, control level and pass rate level of the energy storage system to be assessed; determining the thermal diffusion protection level of the energy storage system to be assessed according to the safety level, control level, pass rate level and a preset assessment matrix; wherein the preset assessment matrix is ​​used to characterize the mapping relationship between the safety level, control level, pass rate level and the thermal diffusion protection level. The thermal diffusion protection level assessment method provided in the present application can achieve a comprehensive assessment of the thermal diffusion protection level of the energy storage system to be assessed by determining the thermal diffusion safety level, control level and pass rate level of the energy storage system to be assessed, and combining with the preset assessment matrix. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 is a flow chart of a method for evaluating a thermal diffusion protection level provided in an embodiment of the present application;

[0043] Figure 2 It is a schematic diagram of the overall process of a thermal diffusion protection level evaluation method provided in an embodiment of the present application;

[0044] Figure 3 It is a principle structural block diagram of a thermal diffusion protection level assessment device provided in an embodiment of the present application;

[0045] Figure 4 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0046] Reference numerals:

[0047] 10 - first determination module; 20 - second determination module; 30 - third determination module; 40 - fourth determination module; 100 - thermal diffusion protection level assessment device. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely 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 creative work are within the scope of protection of the present application.

[0049] It should be understood that although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present application. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0050] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0051] In recent years, with the rapid development of the electric vehicle industry, the country has also paid more and more attention to the safety of electric vehicles, especially the safety of the use of energy storage systems (such as battery systems) on electric vehicles. Among the safety performance of energy storage systems, thermal diffusion protection performance is one of the key safety performances. However, regarding the thermal diffusion protection performance of energy storage systems, the country has issued the standard requirements of "GB38031-2020 Safety Requirements for Power Batteries for Electric Vehicles" and defined the threshold level requirements for the thermal diffusion protection level of energy storage systems, but there is no evaluation method for different thermal diffusion protection levels.

[0052] At present, most of the evaluations of the thermal diffusion protection level of energy storage systems in the industry are directly evaluated with reference to "GB 38031-2020 Safety requirements for power batteries for electric vehicles". Only a few will refer to "GB 38031-2020 Safety requirements for power batteries for electric vehicles" to form corporate standards to evaluate the thermal diffusion protection level of energy storage systems. There is no multi-dimensional evaluation method for the thermal diffusion protection level of energy storage systems.

[0053] In view of this, an embodiment of the present application provides a thermal diffusion protection level assessment method, device, equipment and storage medium. The present application determines the thermal diffusion safety level, control level and pass rate level of the energy storage system to be assessed, and combines a preset assessment matrix to achieve a comprehensive assessment of the thermal diffusion protection level of the energy storage system to be assessed.

[0054] In the technical solution of the embodiment of the present application, the energy storage system to be evaluated is exemplarily described as a battery system, and the same will not be repeated below.

[0055] Figure 1 This is a flow chart of a method for evaluating the thermal diffusion protection level provided in an embodiment of the present application. This method can be applied to an energy storage management system to implement a comprehensive evaluation process of the thermal diffusion protection level of the energy storage system. This method can be performed by a thermal diffusion protection level evaluation device, which can be implemented by software and / or hardware, and can be configured in a processor or controller of the energy storage management system. Please refer to Figure 1 , the method comprises the following steps:

[0056] Step 110: Determine the safety level, control level, and pass rate level of the energy storage system to be evaluated.

[0057] Among them, the safety level of the energy storage system to be evaluated refers to the safety (Safety, referred to as S) level of the thermal diffusion of the energy storage system to be evaluated. The control level of the energy storage system to be evaluated refers to the controllability (Controllability, referred to as C) level of the thermal diffusion of the energy storage system to be evaluated. The pass rate level of the energy storage system to be evaluated refers to the pass rate (Passing rate, referred to as P) level of the thermal diffusion of the energy storage system to be evaluated.

[0058] In some embodiments, the method for determining a security level includes the following steps:

[0059] Step 1: Obtain the safety status information of the energy storage system to be evaluated after the thermal diffusion test.

[0060] The safety status information of the energy storage system to be evaluated after the thermal diffusion test refers to the information related to the safety of the energy storage system to be evaluated collected after the thermal diffusion test is performed on the energy storage system to be evaluated (such as the single cells of the battery system).

[0061] In some embodiments, the safety status information includes information on the occurrence of thermal runaway, information on the triggering of a thermal event signal after the occurrence of thermal runaway, information on the ignition or explosion of the energy storage system to be evaluated after the occurrence of thermal runaway, and the interval from the occurrence of thermal runaway to the ignition or explosion of the energy storage system to be evaluated.

[0062] Among them, the thermal runaway occurrence information includes the occurrence of thermal runaway and the non-occurrence of thermal runaway. Among them, the thermal event signal triggering information after the thermal runaway occurs includes the thermal event signal not being triggered after the thermal runaway occurs and the thermal event signal being triggered after the thermal runaway occurs. For example, taking the battery system as an example, after the thermal runaway occurs in the single cell of the battery system, the battery management system (Battery Management System, BMS) does not report the thermal event trigger signal, or reports the thermal event trigger signal.

[0063] The fire or explosion information of the energy storage system to be evaluated after the thermal runaway occurs includes the fire or explosion of the energy storage system to be evaluated after the thermal runaway occurs and the no fire or explosion of the energy storage system to be evaluated after the thermal runaway occurs.

[0064] The interval from the occurrence of thermal runaway to the fire or explosion of the energy storage system to be evaluated refers to the time period (e.g., greater than or equal to 5 minutes, greater than or equal to 1 hour, greater than or equal to 24 hours, greater than or equal to 48 hours, etc.) after the thermal runaway occurs and the thermal event signal is triggered, and the energy storage system does not catch fire or explode within a certain period of time (e.g., greater than or equal to 5 minutes, greater than or equal to 1 hour, greater than or equal to 24 hours, greater than or equal to 48 hours, etc.).

[0065] Step 2: Determine the safety level according to the safety status information after the thermal diffusion test and the first preset evaluation criteria.

[0066] The first preset evaluation criterion is a criterion for evaluating the safety level of the energy storage system to be evaluated. The safety level includes a first safety level, a second safety level, a third safety level, a fourth safety level and a fifth safety level.

[0067] In some embodiments, the safety level is determined based on the safety status information after the thermal diffusion test and the first preset evaluation criteria, including: determining the safety level based on the thermal runaway occurrence information, the thermal event signal trigger information, the fire or explosion information of the energy storage system to be evaluated, the interval time and the preset time threshold.

[0068] Specifically, if thermal runaway of a single cell occurs and the thermal event signal is not triggered (such as the BMS does not report a thermal event trigger signal), or if the interval duration is less than the first preset duration and the energy storage system catches fire or explodes, the safety level is determined to be the first safety level. If thermal runaway occurs and the thermal event signal is triggered, the interval duration is greater than or equal to the first preset duration and less than the second preset duration, the safety level is determined to be the second safety level. If thermal runaway occurs and the thermal event signal is triggered, the interval duration is greater than or equal to the second preset duration and less than the third preset duration, the safety level is determined to be the third safety level. If thermal runaway occurs and the thermal event signal is triggered, the interval duration is greater than or equal to the third preset duration and less than the fourth preset duration, the safety level is determined to be the fourth safety level. If thermal runaway occurs and the thermal event signal is triggered, the interval duration is greater than or equal to the fourth preset duration, the safety level is determined to be the fifth safety level.

[0069] Exemplarily, the first preset time length is 5 minutes, the second preset time length is 1 hour, the third preset time length is 24 hours, and the fourth preset time length is 48 hours.

[0070] The first preset evaluation criterion is used to evaluate the safety of thermal diffusion of the energy storage system to be evaluated, and to score different safety performance levels. The first preset evaluation criterion is shown in Table 1.

[0071] Table 1 The first preset evaluation criteria

[0072]

[0073] For example, please refer to Table 1. The safety level S includes five scoring items. The larger the number corresponding to the safety level S, the higher the thermal diffusion safety of the corresponding energy storage system. For example, S equals 5, which means the safety level is the fifth safety level, that is, the highest safety level; S equals 1, which means the safety level is the first safety level, that is, the lowest safety level.

[0074] In some embodiments, a method for determining a control level includes the following steps:

[0075] Step 1: Obtain thermal runaway status information of the energy storage system to be evaluated after the thermal diffusion test.

[0076] The thermal runaway status information of the energy storage system to be evaluated after the thermal diffusion test refers to the information related to the thermal runaway of the energy storage system to be evaluated collected after the thermal diffusion test is performed on the energy storage system to be evaluated (such as the single cell of the battery system).

[0077] In some embodiments, the energy storage system to be evaluated includes multiple battery modules, the battery modules include battery cells, and isolation devices are arranged between the multiple battery cells; the thermal runaway status information includes thermal runaway occurrence information of the triggered battery cell, thermal runaway occurrence information of the battery module where the triggered battery cell is located, thermal runaway occurrence information of the battery modules around the triggered battery cell, thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and thermal runaway occurrence information of each isolation device.

[0078] For example, the energy storage system to be evaluated is a battery system, which includes multiple battery modules, each of which is composed of multiple battery cells (single battery cells), and isolation devices are provided between the multiple battery cells. The isolation device includes physical isolation, such as isolation using a diaphragm, insulating material or other structural design.

[0079] Among them, the thermal runaway occurrence information of the triggered cell includes that the triggered cell has thermal runaway and that the triggered cell has not thermal runaway. The thermal runaway occurrence information of the battery module where the triggered cell is located includes that the battery module where the triggered cell is located has thermal runaway and that the battery module where the triggered cell is located has not thermal runaway. The thermal runaway occurrence information of the battery modules around the triggered cell includes that the battery modules around the triggered cell have thermal runaway and that the battery modules around the triggered cell have not thermal runaway. The thermal runaway occurrence information of the cells in the battery modules around the triggered cell includes that the cells in the battery modules around the triggered cell have thermal runaway, the cells in the battery modules around the triggered cell have not thermal runaway, the module where the cells in the battery modules around the triggered cell are located has thermal runaway, the module where the cells in the battery modules around the triggered cell are located has not thermal runaway, the isolation device of the cells in the battery modules around the triggered cell has thermal runaway, and the isolation device of the cells in the battery modules around the triggered cell has not thermal runaway.

[0080] Among them, the battery module where the triggered cell is located, the battery module around the triggered cell, and the cell in the battery module around the triggered cell refer to: for example, the battery system includes a first battery module and a second battery module, and the first battery module includes multiple first cells, the second battery module includes multiple second cells, and taking the triggering of a first cell A in the first battery module as an example, the triggered cell is the first cell A, the battery module where the triggered cell is located refers to the first battery module, the battery module around the triggered cell refers to the second battery module, and the cell in the battery module around the triggered cell refers to one or several second cells. Similarly, if the battery system includes multiple battery modules, it is similar to this and will not be repeated.

[0081] Step 2: Determine the control level based on the thermal runaway state information after the thermal diffusion test and the second preset evaluation criterion.

[0082] The second preset evaluation criterion is a criterion for evaluating the control level of thermal diffusion of the energy storage system to be evaluated. The control level includes a first control level, a second control level, a third control level, a fourth control level and a fifth control level.

[0083] In some embodiments, the control level is determined according to the thermal runaway status information after the thermal diffusion test and the second preset evaluation criteria, including: determining the thermal runaway occurrence range based on the thermal runaway occurrence information of the triggered battery cell, the thermal runaway occurrence information of the battery module where the triggered battery cell is located, the thermal runaway occurrence information of the battery modules around the triggered battery cell, the thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and the thermal runaway occurrence information of each isolation device; determining the control level based on the thermal runaway occurrence range.

[0084] Specifically, if the triggered cell experiences thermal runaway and the battery module around the triggered cell experiences thermal runaway, the control level is determined to be the first control level. If the battery module where the triggered cell is located or the isolation device of the triggered cell experiences thermal runaway after the triggered cell experiences thermal runaway, the control level is determined to be the second control level; if the battery module where the cell in the battery module around the triggered cell is located or the isolation device of the cell in the battery module around the triggered cell does not experience thermal runaway after the triggered cell experiences thermal runaway, the control level is determined to be the third control level; if the cell in the battery module around the triggered cell does not experience thermal runaway after the triggered cell experiences thermal runaway, the control level is determined to be the fourth control level; if the triggered cell does not experience thermal runaway, the control level is determined to be the fifth control level.

[0085] Table 2 The second preset evaluation criteria

[0086]

[0087]

[0088] The second preset evaluation criteria are used to evaluate the controllability of the thermal diffusion of the energy storage system to be evaluated, and to evaluate and score different controllability levels. The second preset evaluation criteria are shown in Table 2.

[0089] For example, please refer to Table 2. The control level C includes five scoring items. The larger the number corresponding to the control level C, the better the controllability of the thermal diffusion of the corresponding energy storage system. For example, C equals 5, which means the control level is the fifth control level, that is, the best controllability; C equals 1, which means the control level is the first control level, that is, the worst controllability.

[0090] In some embodiments, determining the pass rate level includes the following steps:

[0091] Step 1: Obtain the pass rate information of the samples of the energy storage system to be evaluated after the thermal diffusion test.

[0092] The sample pass rate information of the energy storage system to be evaluated after the thermal diffusion test refers to the information related to the pass status of the samples of the energy storage system to be evaluated after the thermal diffusion test is performed on the energy storage system to be evaluated (such as the single cell of the battery system).

[0093] In some embodiments, the sample pass rate information includes the sample pass rate and the number of passed samples.

[0094] The sample passing rate refers to the percentage of samples that pass the test among multiple test samples. The number of samples that pass refers to the situation where a random sample among multiple test samples passes at one time and / or the situation where a preset number of samples pass continuously. For example, a random set of samples among multiple sets of samples passes the test at one time, two samples pass continuously for the first time among multiple sets of samples, and three samples pass continuously for the first time among multiple sets of samples.

[0095] Step 2: Determine the pass rate level according to the sample pass rate information after the thermal diffusion test and the third preset evaluation criterion.

[0096] The third preset evaluation criterion is a criterion for evaluating the pass rate level of the thermal diffusion of the energy storage system to be evaluated. The pass rate level includes a first pass rate level, a second pass rate level, a third pass rate level, a fourth pass rate level and a fifth pass rate level.

[0097] In some embodiments, the pass rate level is determined based on the sample pass rate information after the thermal diffusion test and the third preset evaluation criteria, including: determining the pass rate level based on the sample pass rate, the number of passed samples, the preset pass rate threshold and the preset number threshold.

[0098] The preset pass rate threshold may be 35%, 50%, etc., which may be set according to actual conditions and is not specifically limited here. The preset quantity threshold may be one set (or one piece), two sets (or two pieces), three sets (or three pieces), etc., which may be set according to actual conditions and is not specifically limited here.

[0099] Specifically, if the pass rate of the samples in the first preset number of samples is less than or equal to the first preset pass rate, the pass rate level is determined to be the first pass rate level; if the pass rate of the samples in the first preset number of samples is less than or equal to the second preset pass rate, the pass rate level is determined to be the second pass rate level; if a random one of the samples in the first preset number of samples passes at one time, the pass rate level is determined to be the third pass rate level; if two samples in the first preset number of samples pass consecutively for the first time, the pass rate level is determined to be the fourth pass rate level; if three samples in the first preset number of samples pass consecutively for the first time, the pass rate level is determined to be the fifth pass rate level. Exemplarily, the first preset pass rate is 35% and the second preset pass rate is 50%. In addition, the first preset pass rate and the second preset pass rate can also be other values, which can be set according to actual conditions and are not specifically limited here.

[0100] The first preset quantity is the number of pieces or sets of samples actually tested, and the specific value can be set according to actual conditions and is not specifically limited here.

[0101] The third preset evaluation criterion is used to evaluate the pass rate of the thermal diffusion samples of the energy storage system to be evaluated, and to evaluate and score different pass rate levels. The third preset evaluation criterion is shown in Table 3.

[0102] Table 3 The third preset evaluation criteria

[0103] P Grade Assessment Criteria 1 Sample pass rate ≤35% 2 Sample pass rate ≤50% 3 A set of samples passed 4 Both sets of samples passed 5 All three sets of samples passed

[0104] For example, please refer to Table 3. The pass rate level P includes five scoring items. The larger the number corresponding to the pass rate level P, the higher the pass rate of the corresponding energy storage system's thermal diffusion. The higher the pass rate, the better the thermal diffusion protection design. For example, P equals 5, which means the pass rate level is the fifth pass rate level, that is, the highest pass rate and the best thermal diffusion protection design; P equals 1, which means the pass rate level is the first pass rate level, that is, the lowest pass rate and the poor thermal diffusion protection design.

[0105] Step 120: Determine the thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, control level, pass rate level and a preset evaluation matrix, wherein the preset evaluation matrix is ​​used to characterize the mapping relationship between the safety level, control level, pass rate level and thermal diffusion protection level.

[0106] Since the preset evaluation matrix can characterize the mapping relationship between the safety level, control level, pass rate level and thermal diffusion protection level, after determining the safety level, control level and pass rate level of the energy storage system to be evaluated, the thermal diffusion protection level of the energy storage system to be evaluated can be determined according to the safety level, control level, pass rate level and the preset evaluation matrix, and a comprehensive evaluation of the thermal diffusion protection level of the energy storage system to be evaluated can be achieved from the three dimensions of safety, controllability and sample pass rate, solving the problem of the lack of multi-dimensional evaluation of the thermal diffusion protection level of the energy storage system in the prior art. It can also quantitatively evaluate the thermal diffusion protection level of the energy storage system, fully respond to the needs of graded evaluation of the thermal diffusion protection performance of different energy storage systems, and has excellent guiding significance and wide use value for the target setting of the thermal diffusion protection level of the energy storage system.

[0107] In some embodiments, the method for determining the thermal diffusion protection level of the energy storage system to be evaluated includes the following steps:

[0108] Step 1: According to the safety level, determine the safety level position of the energy storage system to be evaluated from the preset evaluation matrix.

[0109] Specifically, since the preset evaluation matrix can characterize the mapping relationship among the safety level, control level, pass rate level and thermal diffusion protection level, after determining the safety level of the energy storage system to be evaluated, the safety level position of the energy storage system to be evaluated can be determined from the preset evaluation matrix according to the safety level, which is conducive to the subsequent determination of the level positions of other dimensions (such as control level and pass rate level) and the determination of the thermal diffusion protection level.

[0110] Step 2: According to the safety level position, control level, and pass rate level of the energy storage system to be evaluated, the control level position and pass rate level position of the energy storage system to be evaluated are determined from a preset evaluation matrix.

[0111] Specifically, after determining the safety level position, control level, and pass rate level of the energy storage system to be evaluated, the control level position and pass rate level position of the energy storage system to be evaluated can be determined according to the mapping relationship between the safety level, control level, pass rate level, and thermal diffusion protection level represented by the preset evaluation matrix, which is conducive to the subsequent determination of the thermal diffusion protection level.

[0112] Step 3: Determine the thermal diffusion protection level of the energy storage system to be evaluated from a preset evaluation matrix according to the control level position and the pass rate level position of the energy storage system to be evaluated.

[0113] Among them, the thermal diffusion protection level includes the first protection level, the second protection level, the third protection level and the fourth protection level.

[0114] Specifically, after determining the control level position and pass rate level position of the energy storage system to be evaluated, according to the mapping relationship between the safety level, control level, pass rate level and thermal diffusion protection level represented by the preset evaluation matrix, the thermal diffusion protection level of the energy storage system to be evaluated can be determined from the preset evaluation matrix, so as to evaluate the energy storage system to be evaluated according to the thermal diffusion protection level of the energy storage system to be evaluated, and realize a comprehensive evaluation. It can also quantitatively evaluate the thermal diffusion protection level of the energy storage system, and can fully respond to the hierarchical evaluation requirements of the thermal diffusion protection performance of different energy storage systems, which has excellent guiding significance and wide use value for the target setting of the thermal diffusion protection level of the energy storage system.

[0115] Exemplarily, taking the energy storage system to be evaluated as a battery system as an example, the battery system thermal diffusion protection level (Battery Thermal Propagation Protection Level, referred to as BTPPL level), the structure of the preset evaluation matrix is ​​shown in Table 4. Exemplarily, referring to Table 4, the preset evaluation matrix includes a safety (S) level column, a control (C) level column, a pass rate (P) level column, and a thermal diffusion protection (BTPPL) level column.

[0116] Table 4 Preset evaluation matrix

[0117]

[0118]

[0119] Exemplarily, referring to Tables 1 to 4, the specific implementation process of determining the thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, control level, pass rate level and the preset evaluation matrix is ​​as follows: First, assuming that the safety level of the energy storage system to be evaluated is determined to be the fifth safety level (corresponding to the score of 5 in Table 1) according to Table 1, the control level of the energy storage system to be evaluated is determined to be the third control level (corresponding to the score of 3 in Table 2) according to Table 2, and the pass rate level of the energy storage system to be evaluated is determined to be the first pass rate level (corresponding to the score of 1 in Table 3) according to Table 3. Then, according to the score of the fifth safety level, referring to Table 4, it can be determined from the S level column in the preset evaluation matrix that the number corresponding to the safety level position of the energy storage system to be evaluated is 5. Secondly, referring to Table 4, according to the number 5 corresponding to the safety level position of the energy storage system to be evaluated, the score of 3 for the third control level, the C level column in the preset evaluation matrix, the score of 1 for the first pass rate level, and the P level column in the preset evaluation matrix, it can be determined that the number corresponding to the control level position of the energy storage system to be evaluated is 3, and the number corresponding to the pass rate level position of the energy storage system to be evaluated is in the range of 1-2. Finally, according to the number 3 corresponding to the control level position, the number range 1-2 corresponding to the pass rate level position, and the BTPPL level column, it can be determined that the thermal diffusion protection level of the energy storage system to be evaluated is the first protection level, and the corresponding score is 1. Therefore, the thermal diffusion protection level of the energy storage system can be evaluated from the dimensions of safety, controllability, and sample pass rate, achieving a comprehensive evaluation.

[0120] In some embodiments, after determining the thermal diffusion protection level of the energy storage system to be evaluated, the process further includes determining an evaluation result of the thermal diffusion protection level of the energy storage system to be evaluated, specifically including: determining an evaluation result of the thermal diffusion protection level of the energy storage system to be evaluated according to the thermal diffusion protection level of the energy storage system to be evaluated and a fourth preset evaluation criterion.

[0121] Specifically, the thermal diffusion protection level includes the first protection level, the second protection level, the third protection level and the fourth protection level. The thermal diffusion protection level evaluation results include: excellent, good, medium and general. The thermal diffusion protection level evaluation result of the energy storage system to be evaluated is determined according to the thermal diffusion protection level of the energy storage system to be evaluated and the fourth preset evaluation criterion, including: if the thermal diffusion protection level is the first protection level, the thermal diffusion protection level evaluation result is determined to be excellent; if the thermal diffusion protection level is the second protection level, the thermal diffusion protection level evaluation result is determined to be good; if the thermal diffusion protection level is the third protection level, the thermal diffusion protection level evaluation result is determined to be medium; if the thermal diffusion protection level is the fourth protection level, the thermal diffusion protection level evaluation result is determined to be general.

[0122] The fourth preset evaluation criterion is used to evaluate the comprehensive level of the thermal diffusion protection performance of the energy storage system. The fourth preset evaluation criterion is shown in Table 5.

[0123] Table 5 The fourth preset evaluation criteria

[0124] BTPPL Rating Definition 1 The energy storage system has an excellent level of thermal diffusion protection 2 The energy storage system has a good level of thermal diffusion protection 3 The thermal diffusion protection level of the energy storage system is medium 4 The thermal diffusion protection level of the energy storage system is average

[0125] Figure 2 This is a schematic diagram of the overall process of a thermal diffusion protection level evaluation method provided in an embodiment of the present application. For example, taking a battery system as an example, please refer to Figure 2 The evaluation process of the thermal diffusion protection level of the energy storage system to be evaluated includes the following steps:

[0126] Step 1: Collect battery system thermal diffusion test data.

[0127] Step 2: Based on the test data of step 1, refer to Table 1 to evaluate its safety S level.

[0128] Step 3: Based on the test data of step 1, refer to Table 2 to evaluate its controllability C level.

[0129] Step 4: Based on the test data of step 1, refer to Table 3 to evaluate the pass rate P level of the samples.

[0130] Step 5. Summarize the safety S level, controllability C level, and sample pass rate P level data from steps 2 to 4, and evaluate the battery system thermal diffusion protection level BTPPL with reference to the preset evaluation matrix in Table 4 to obtain the evaluation level data.

[0131] Step 6: Based on the evaluation data of the battery system thermal diffusion protection level BTPPL in step 5, refer to Table 5 to obtain the evaluation results of the battery system thermal diffusion protection level.

[0132] It can be seen from this that the present application provides an S-level safety assessment method for thermal diffusion of an energy storage system, a C-level assessment method for controllability of thermal diffusion of an energy storage system, a P-level assessment method for sample pass rate of thermal diffusion of an energy storage system, and a comprehensive assessment of the thermal diffusion protection level BTPPL of an energy storage system in multiple dimensions based on the safety level, controllability level, sample pass rate level and a preset assessment matrix. It can also quantitatively assess the thermal diffusion protection level of an energy storage system, and can fully respond to the needs of graded assessment of the thermal diffusion protection performance of different energy storage systems, and has excellent guiding significance and wide use value for the target setting of the thermal diffusion protection level of an energy storage system.

[0133] Figure 3 is a principle structure diagram of a thermal diffusion protection level assessment device provided in the embodiment of the present application. Correspondingly, the embodiment of the present application also provides a thermal diffusion protection level assessment device, please refer to Figure 3 The thermal diffusion protection level assessment device 100 includes: a first determination module 10, used to determine the safety level of the energy storage system to be assessed; a second determination module 20, used to determine the control level of the energy storage system to be assessed; a third determination module 30, used to determine the pass rate level of the energy storage system to be assessed; a fourth determination module 40, used to determine the thermal diffusion protection level of the energy storage system to be assessed according to the safety level, control level, pass rate level and a preset assessment matrix; wherein the preset assessment matrix is ​​used to characterize the mapping relationship between the safety level, control level, pass rate level and the thermal diffusion protection level.

[0134] In the technical solution of the embodiment of the present application, the thermal diffusion protection level assessment includes a first determination module for determining the safety level of the energy storage system to be assessed; a second determination module for determining the control level of the energy storage system to be assessed; a third determination module for determining the pass rate level of the energy storage system to be assessed; and a fourth determination module for determining the thermal diffusion protection level of the energy storage system to be assessed based on the safety level, control level, pass rate level and a preset assessment matrix; wherein the preset assessment matrix is ​​used to characterize the mapping relationship between the safety level, control level, pass rate level and thermal diffusion protection level. The thermal diffusion protection level assessment device provided in the present application can comprehensively assess the thermal diffusion protection level of the energy storage system to be assessed by determining the thermal diffusion safety level, control level and pass rate level of the energy storage system to be assessed, and combining with the preset assessment matrix. It can also quantitatively assess the thermal diffusion protection level of the energy storage system, and can fully respond to the hierarchical assessment requirements of the thermal diffusion protection performance of different energy storage systems, and has excellent guiding significance and wide use value for the target setting of the thermal diffusion protection level of the energy storage system.

[0135] In some embodiments, the fourth determination module 40 is used to: determine the safety level position of the energy storage system to be evaluated from a preset evaluation matrix according to the safety level; determine the control level position and the pass rate level position of the energy storage system to be evaluated from the preset evaluation matrix according to the safety level position, control level, and pass rate level of the energy storage system to be evaluated; determine the thermal diffusion protection level of the energy storage system to be evaluated from the preset evaluation matrix according to the control level position and the pass rate level position of the energy storage system to be evaluated.

[0136] In some embodiments, the first determination module 10 is used to: obtain safety status information of the energy storage system to be evaluated after a heat diffusion test; and determine the safety level according to the safety status information after the heat diffusion test and a first preset evaluation criterion.

[0137] In some embodiments, the safety status information includes thermal runaway occurrence information, thermal event signal triggering information after thermal runaway occurs, fire or explosion information of the energy storage system to be evaluated after thermal runaway occurs, and the interval time from the occurrence of thermal runaway to the fire or explosion of the energy storage system to be evaluated;

[0138] The first determination module 10 is further used to determine the safety level based on the thermal runaway occurrence information, the thermal event signal triggering information, the fire or explosion information of the energy storage system to be evaluated, the interval time and the preset time threshold.

[0139] In some embodiments, the second determination module 20 is used to: obtain thermal runaway state information of the energy storage system to be evaluated after a thermal diffusion test; and determine the control level according to the thermal runaway state information after the thermal diffusion test and a second preset evaluation criterion.

[0140] In some embodiments, the energy storage system to be evaluated includes multiple battery modules, the battery modules include battery cells, and isolation devices are provided between the multiple battery cells; the thermal runaway state information includes thermal runaway occurrence information of the triggered battery cell, thermal runaway occurrence information of the battery module where the triggered battery cell is located, thermal runaway occurrence information of the battery modules around the triggered battery cell, thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and thermal runaway occurrence information of each isolation device;

[0141] The second determination module 20 is also used to: determine the scope of thermal runaway based on the thermal runaway occurrence information of the triggered battery cell, the thermal runaway occurrence information of the battery module where the triggered battery cell is located, the thermal runaway occurrence information of the battery modules around the triggered battery cell, the thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and the thermal runaway occurrence information of each isolation device; and determine the control level based on the thermal runaway occurrence scope.

[0142] In some embodiments, the third determination module 30 is used to: obtain sample pass rate information of the energy storage system to be evaluated after the thermal diffusion test; and determine the pass rate level according to the sample pass rate information after the thermal diffusion test and the third preset evaluation criterion.

[0143] In some embodiments, the sample pass rate information includes the sample pass rate and the number of passed samples; the third determination module 30 is also used to determine the pass rate level based on the sample pass rate, the number of passed samples, the preset pass rate threshold and the preset number threshold.

[0144] In some embodiments, the thermal diffusion protection level assessment device 100 further includes a fifth determination module for determining an evaluation result of the thermal diffusion protection level of the energy storage system to be assessed according to the thermal diffusion protection level of the energy storage system to be assessed and a fourth preset assessment criterion.

[0145] Accordingly, the present application also provides an electronic device, see Figure 4 , Figure 4 The structure diagram of the electronic device of the embodiment of the present application is illustrated. 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 computer program, the steps of the above-mentioned thermal diffusion protection level evaluation method are implemented. Since the thermal diffusion protection level evaluation method is described in detail above, it will not be repeated here.

[0146] Accordingly, the embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned thermal diffusion protection level evaluation method are implemented. Since the thermal diffusion protection level evaluation method is described in detail above, it will not be repeated here.

[0147] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0148] The above is a detailed introduction to the thermal diffusion protection level assessment method, device, equipment and storage medium provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A method for evaluating thermal diffusion protection level, characterized in that: Applied to evaluating the thermal diffusion protection level of an energy storage system, the method comprises: Determine the safety level, control level and pass rate level of the energy storage system to be evaluated; Determining a thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, the control level, the pass rate level, and a preset evaluation matrix; The preset evaluation matrix is ​​used to characterize the mapping relationship among the safety level, the control level, the pass rate level and the thermal diffusion protection level.

2. The thermal diffusion protection level evaluation method according to claim 1, characterized in that: The method for determining the thermal diffusion protection level of the energy storage system to be evaluated comprises: According to the safety level, determining the safety level position of the energy storage system to be evaluated from the preset evaluation matrix; According to the safety level position, the control level, and the pass rate level of the energy storage system to be evaluated, determining the control level position and the pass rate level position of the energy storage system to be evaluated from the preset evaluation matrix; According to the control level position and the pass rate level position of the energy storage system to be evaluated, the thermal diffusion protection level of the energy storage system to be evaluated is determined from the preset evaluation matrix.

3. The thermal diffusion protection level evaluation method according to claim 1, characterized in that: The method for determining the security level comprises: Obtaining safety status information of the energy storage system to be evaluated after the thermal diffusion test; The safety level is determined according to the safety status information after the heat diffusion test and a first preset evaluation criterion.

4. The thermal diffusion protection level evaluation method according to claim 3, characterized in that: The safety status information includes thermal runaway occurrence information, thermal event signal triggering information after thermal runaway occurs, fire or explosion information of the energy storage system to be evaluated after thermal runaway occurs, and the interval time from the occurrence of thermal runaway to the fire or explosion of the energy storage system to be evaluated; The step of determining the safety level according to the safety status information after the thermal diffusion test and a first preset evaluation criterion includes: The safety level is determined based on the thermal runaway occurrence information, the thermal event signal triggering information, the fire or explosion information of the energy storage system to be evaluated, the interval time and the preset time threshold.

5. The thermal diffusion protection level evaluation method according to claim 1, characterized in that: The method for determining the control level comprises: Obtaining thermal runaway state information of the energy storage system to be evaluated after a thermal diffusion test; The control level is determined according to the thermal runaway state information after the thermal diffusion test and a second preset evaluation criterion.

6. The thermal diffusion protection level evaluation method according to claim 5, characterized in that: The energy storage system to be evaluated includes a plurality of battery modules, each of which includes battery cells, and an isolation device is provided between the plurality of battery cells; the thermal runaway state information includes thermal runaway occurrence information of the triggered battery cell, thermal runaway occurrence information of the battery module where the triggered battery cell is located, thermal runaway occurrence information of the battery modules around the triggered battery cell, thermal runaway occurrence information of the battery cells in the battery modules around the triggered battery cell, and thermal runaway occurrence information of each isolation device; Determining the control level according to the thermal runaway state information after the thermal diffusion test and a second preset evaluation criterion includes: Determine the thermal runaway occurrence range based on the thermal runaway occurrence information of the triggered cell, the thermal runaway occurrence information of the battery module where the triggered cell is located, the thermal runaway occurrence information of the battery modules around the triggered cell, the thermal runaway occurrence information of the cells in the battery modules around the triggered cell, and the thermal runaway occurrence information of each of the isolation devices; The control level is determined based on the thermal runaway occurrence range.

7. The thermal diffusion protection level evaluation method according to claim 1, characterized in that: Determine the pass rate level, including: Obtaining sample pass rate information of the energy storage system to be evaluated after a thermal diffusion test; The pass rate level is determined according to the sample pass rate information after the thermal diffusion test and a third preset evaluation criterion.

8. The thermal diffusion protection level evaluation method according to claim 7, characterized in that: The sample pass rate information includes the sample pass rate and the number of samples that passed; the pass rate level is determined according to the sample pass rate information after the thermal diffusion test and the third preset evaluation criteria, including: The pass rate level is determined based on the sample pass rate, the number of passed samples, a preset pass rate threshold and a preset number threshold.

9. The thermal diffusion protection level evaluation method according to claim 1, characterized in that: After determining the thermal diffusion protection level of the energy storage system to be evaluated, the method further includes: An evaluation result of the thermal diffusion protection level of the energy storage system to be evaluated is determined according to the thermal diffusion protection level of the energy storage system to be evaluated and a fourth preset evaluation criterion.

10. A thermal diffusion protection level assessment device, characterized in that: include: A first determination module is used to determine the safety level of the energy storage system to be evaluated; A second determination module is used to determine the control level of the energy storage system to be evaluated; The third determination module is used to determine the pass rate level of the energy storage system to be evaluated; A fourth determination module, configured to determine a thermal diffusion protection level of the energy storage system to be evaluated according to the safety level, the control level, the pass rate level, and a preset evaluation matrix; The preset evaluation matrix is ​​used to characterize the mapping relationship among the safety level, the control level, the pass rate level and the thermal diffusion protection level.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the thermal diffusion protection level evaluation method according to any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the thermal diffusion protection level evaluation method according to any one of claims 1 to 9 is implemented.

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