Battery safety state evaluation method, device, equipment and medium

Abstract

The invention relates to the technical field of battery state monitoring, in particular to a battery safety state assessment method, device and equipment and a medium, and the method comprises the steps: obtaining a target health state value of a to-be-assessed battery; according to the target health state value, determining a target thermal runaway trigger temperature corresponding to the to-be-evaluated battery based on a first corresponding relation between a preset health state value and the thermal runaway trigger temperature; and according to the target thermal runaway trigger temperature, carrying out safety state evaluation on the to-be-evaluated battery to obtain a corresponding evaluation result. The battery safety state assessment method not only improves the efficiency and accuracy of battery safety state assessment, but also does not need destructive testing on the battery, and is simple in implementation method and good in applicability and robustness.

Description

Technical Field

[0001] The present invention relates to the technical field of battery status monitoring, and in particular to a battery safety status assessment method, device, equipment and medium. Background Art

[0002] As the global energy transition accelerates, electric vehicles will replace traditional fuel vehicles to dominate the automobile market. Electric vehicles with power batteries as energy storage media have advantages that fuel vehicles cannot replace, such as fast acceleration, good handling performance, and low pollution emissions. However, since power battery technology is not yet mature, the battery operation state is very easy to get out of control. Phenomena such as fire, explosion, and thermal runaway have greatly reduced the safety and reliability of electric vehicles. Therefore, accurately evaluating the power battery safety state (State of Safety, SOS) is of great practical significance.

[0003] At present, there are mainly the following methods for monitoring battery safety status:

[0004] The safety status of the battery under test is inferred based on the comparison of characteristic parameters (such as temperature and internal resistance) between the standard battery and the battery under test. However, the logical starting point of this method is to infer battery safety by comparing the longitudinal historical data of battery safety evolution. First of all, it must ensure the data reliability of the standard battery. In addition, there is a plateau period for the growth of battery internal resistance, which as a characteristic parameter leads to inaccurate inference results.

[0005] The battery status value is compared with the preset threshold value, and the failure state or safety state of the battery is determined according to the comparison result. Among them, the evaluation indicators for determining the battery status value may include constant current charging temperature rise, median voltage, capacity, power and stress, etc. By calculating the coefficient of variation of each indicator, an objective weight is assigned to each indicator according to the coefficient of variation, and then the battery status value is calculated. This method of predicting the safety status of the battery based on multiple indicators first requires the accumulation of multiple different indicators. In practical applications, there are great challenges in the number of sensors and data processing.

[0006] Based on safety characteristic parameters (including voltage, temperature, current and power, etc.), the safety status scores corresponding to each physical field, and the comprehensive scores of the actual safety status of the sample energy storage battery, a mechanism-data multi-domain model is established, and the safety status scores corresponding to the physical field are calculated according to the safety characteristic parameters under each physical field. However, modeling based on multiple physical fields first requires the collection of a large amount of data and the establishment of coupling relationships between different physical fields, and the implementation method is relatively complicated. In addition, a large amount of data and scenarios required to establish the model are obtained based on fresh batteries, which makes it difficult for this method to accurately evaluate the safety status of used batteries. Summary of the invention

[0007] In view of the above problems in the prior art, an object of the present invention is to provide a battery safety status assessment method, device, equipment and medium, which can improve the efficiency and accuracy of battery safety status assessment.

[0008] In order to solve the above problems, the present invention provides a battery safety status assessment method, comprising:

[0009] Obtain the target health status value of the battery to be evaluated;

[0010] Determining, according to the target health state value, a target thermal runaway trigger temperature corresponding to the battery to be evaluated based on a first corresponding relationship between a preset health state value and a thermal runaway trigger temperature;

[0011] The safety status of the battery to be evaluated is evaluated according to the target thermal runaway trigger temperature to obtain the corresponding evaluation result.

[0012] Furthermore, obtaining the target health status value of the battery to be evaluated includes:

[0013] Measuring the battery capacity or battery energy of the battery to be evaluated during actual operation;

[0014] The target health status value is calculated based on the battery capacity or battery energy.

[0015] Furthermore, the safety status of the battery to be evaluated is evaluated according to the target thermal runaway trigger temperature, including:

[0016] Obtaining a second corresponding relationship between a preset thermal runaway trigger temperature and a safety state assessment score;

[0017] According to the target thermal runaway trigger temperature and based on the second corresponding relationship, a target safety status assessment score corresponding to the battery to be assessed is determined.

[0018] Furthermore, the method further comprises:

[0019] Determine the safety warning level corresponding to the battery to be evaluated according to the target safety status evaluation score;

[0020] The batteries to be evaluated are classified and restricted according to their safety warning levels.

[0021] Furthermore, the safety warning level corresponding to the battery to be evaluated is determined according to the target safety status evaluation score, including:

[0022] If the target safety status assessment score is greater than or equal to the first score, determining that the battery to be assessed is in a safe state;

[0023] If the target safety status assessment score is greater than or equal to the second score and less than the first score, the safety warning level is determined to be level three warning;

[0024] If the target safety status assessment score is greater than or equal to the third score and less than the second score, the safety warning level is determined to be a level 2 warning;

[0025] If the target safety status assessment score is less than the third score, the safety warning level is determined to be level one warning.

[0026] Furthermore, the batteries to be evaluated are subject to graded restrictions according to the safety warning level, including:

[0027] If the safety warning level is level three, the maximum operating temperature of the battery to be evaluated is limited to the first temperature;

[0028] If the safety warning level is level 2, the maximum operating temperature of the battery to be evaluated is limited to the second temperature;

[0029] If the safety warning level is level one, the battery to be evaluated is controlled to stop working.

[0030] Further, the method also includes predetermining a first corresponding relationship between the health state value and the thermal runaway trigger temperature, including:

[0031] Get multiple batteries with different health status values;

[0032] Conduct thermal runaway tests on multiple batteries with different health status values ​​and record the corresponding thermal runaway trigger temperatures;

[0033] According to a plurality of batteries with different health state values ​​and their corresponding thermal runaway trigger temperatures, a first corresponding relationship between the health state value and the thermal runaway trigger temperature is obtained by fitting.

[0034] Another aspect of the present invention provides a battery safety status assessment device, comprising:

[0035] An acquisition module, used to obtain a target health status value of a battery to be evaluated;

[0036] A determination module, configured to determine, according to the target health state value and based on a first correspondence between a preset health state value and a thermal runaway trigger temperature, a target thermal runaway trigger temperature corresponding to the battery to be evaluated;

[0037] The evaluation module is used to evaluate the safety status of the battery to be evaluated according to the target thermal runaway trigger temperature and obtain the corresponding evaluation result.

[0038] Another aspect of the present invention provides an electronic device, including a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement the battery safety status assessment method as described above.

[0039] On the other hand, the present invention provides a computer-readable storage medium, which stores at least one instruction or at least one program. The at least one instruction or the at least one program is loaded and executed by a processor to implement the battery safety status assessment method as described above.

[0040] Another aspect of the present invention provides a computer program product, comprising a computer program / instruction, which implements the battery safety status assessment method as described above when executed by a processor.

[0041] Due to the above technical solution, the present invention has the following beneficial effects:

[0042] According to the battery safety status assessment method of an embodiment of the present invention, by pre-constructing the correlation relationship between the battery health state (State of Health, SOH) and thermal safety during the life cycle, when the SOH value of the battery to be assessed is known, the thermal runaway trigger temperature corresponding to the battery to be assessed can be determined according to the correlation relationship, and then the safety status of the battery can be judged according to the thermal runaway trigger temperature, thereby providing an efficient assessment method for safe operation and maintenance of the battery, which not only improves the efficiency and accuracy of the battery safety status assessment, but also eliminates the need to perform destructive testing on the battery, saving costs. At the same time, the implementation method is simple and has good applicability and robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a flow chart of a battery safety status assessment method provided by an embodiment of the present invention;

[0045] Figure 2 is a flow chart of a battery safety status assessment method provided by another embodiment of the present invention;

[0046] Figure 3 is a flow chart of a battery safety status assessment method provided by another embodiment of the present invention;

[0047] Figure 4 is a flow chart for constructing a first correspondence relationship provided by an embodiment of the present invention;

[0048] Figure 5 is a schematic diagram of a temperature curve of a thermal runaway test provided by an embodiment of the present invention;

[0049] Figure 6 is a flowchart for constructing a first correspondence relationship provided by a specific embodiment of the present invention;

[0050] Figure 7 is a schematic diagram of a first corresponding relationship provided by an embodiment of the present invention;

[0051] Figure 8 is a schematic structural diagram of a battery safety status assessment device provided by an embodiment of the present invention;

[0052] Fig. 9 is a block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0055] In order to make the purpose, technical solution and advantages disclosed in the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not used to limit the embodiments of the present invention.

[0056] Reference Manual Attached Figure 1 , which shows the process of a battery safety status assessment method provided by an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0057] S110: Obtain a target health status value of the battery to be evaluated.

[0058] In the embodiment of the present invention, the electrochemical parameters of the battery to be evaluated can be measured, and the target SOH value of the battery to be evaluated can be calculated based on the measured electrochemical parameters. The electrochemical parameters can include but are not limited to any one of capacity and energy.

[0059] In some embodiments, obtaining the target health state value of the battery to be evaluated may include: measuring the battery capacity or battery energy of the battery to be evaluated during actual operation; and calculating the target health state value based on the battery capacity or battery energy.

[0060] For example, the capacity or energy of the battery to be evaluated can be obtained based on the 0.5C / 0.5C constant current charge and discharge of the battery, and then the ratio of the capacity / energy of the battery to be evaluated to the capacity / energy of the fresh battery can be calculated based on the measured capacity or energy and the capacity or energy of the fresh battery, which is the target SOH value of the battery to be evaluated. In other words, the target SOH value of the battery to be evaluated = the capacity of the battery to be evaluated / the capacity of the fresh battery, or the target SOH value of the battery to be evaluated = the energy of the battery to be evaluated / the energy of the fresh battery.

[0061] The capacity or energy of the fresh battery may be predetermined, or may be obtained based on 0.5C / 0.5C constant current charging and discharging of the battery, and the embodiment of the present invention does not impose any specific limitation on this.

[0062] It should be noted that the above-mentioned implementation method of determining the target SOH value of the battery to be evaluated based on the battery capacity or battery energy is only an example. In practical applications, other electrochemical parameters (such as AC internal resistance) can also be used to determine the target SOH value of the battery to be evaluated. The embodiment of the present invention does not impose specific restrictions on this.

[0063] S120: Determine, according to the target health state value and based on a first corresponding relationship between a preset health state value and a thermal runaway trigger temperature, a target thermal runaway trigger temperature corresponding to the battery to be evaluated.

[0064] In the embodiment of the present invention, a plurality of batteries with different SOH values ​​may be subjected to thermal runaway tests in advance to obtain corresponding thermal runaway trigger temperatures, and then the first corresponding relationship between the SOH value and the thermal runaway trigger temperature may be summarized. The specific construction method will be described in detail later.

[0065] In the embodiment of the present invention, after the target SOH value of the battery to be evaluated is obtained, the thermal runaway trigger temperature of the battery can be reversely inferred through the SOH value according to a predetermined first corresponding relationship, so that the safety status of the battery can be evaluated.

[0066] Specifically, the first corresponding relationship may be the following function corresponding relationship:

[0067] T1=k1(SOH)+b1 (1)

[0068] Wherein, T1 represents the thermal runaway trigger temperature, which can be defined as the temperature when the temperature rise rate of the battery's self-generated heat exceeds 0.02°C / min, the temperature when three temperature rise rates are continuously monitored to be ≥3°C / s, the temperature at the time of fire, or the temperature at the time of explosion, etc. The target thermal runaway trigger temperature corresponding to the battery to be evaluated can be calculated using the above formula (1) according to the target SOH value of the battery to be evaluated.

[0069] It can be understood that after the embodiment of the present invention measures the battery SOH value, there is no need to arrange a destructive thermal runaway test. Instead, by summarizing the correlation between the obtained SOH value and the battery thermal runaway trigger temperature, the battery thermal runaway trigger temperature can be reversely inferred through the SOH value, thereby evaluating the safety status of the battery, saving time and cost.

[0070] S130: Perform safety status assessment on the battery to be assessed according to the target thermal runaway trigger temperature to obtain a corresponding assessment result.

[0071] In the embodiment of the present invention, the safety state of the battery can be directly evaluated according to the thermal runaway trigger temperature of the battery, and the safety state evaluation result of the battery can be determined, so as to provide early warning and maintenance for the battery safety. The evaluation result can include but is not limited to the target safety state evaluation score corresponding to the battery to be evaluated, the safety warning level and other information.

[0072] In summary, according to the battery safety status assessment method of an embodiment of the present invention, by pre-constructing the correlation relationship between the battery SOH and thermal safety during the life cycle, when the SOH value of the battery to be assessed is known, the thermal runaway trigger temperature corresponding to the battery to be assessed can be determined according to the correlation relationship, and then the safety status of the battery can be judged according to the thermal runaway trigger temperature, thereby providing an efficient assessment method for safe operation and maintenance of the battery, which not only improves the efficiency and accuracy of the battery safety status assessment, but also eliminates the need to perform destructive testing on the battery, saving costs. At the same time, the implementation method is simple and has good applicability and robustness.

[0073] In some embodiments, the Figure 2 , the safety status of the battery to be evaluated is evaluated according to the target thermal runaway trigger temperature, which may include:

[0074] S131: Obtain a second corresponding relationship between a preset thermal runaway trigger temperature and a safety state assessment score.

[0075] Specifically, thermal runaway tests can be performed on multiple batteries with different SOHs in advance, and the lower limit of the thermal runaway trigger temperature can be obtained as a base point. The thermal runaway trigger temperature can be linearly interpolated and scored to obtain a second corresponding relationship between the thermal runaway trigger temperature and the safety status assessment score.

[0076] Exemplarily, the second corresponding relationship may be the following function corresponding relationship:

[0077]

[0078] Among them, X represents the safety status assessment score, and T1 represents the thermal runaway trigger temperature. That is to say, when T1 is greater than or equal to 90°C, the safety status assessment score is 100 points; when T1 is less than or equal to 60°C, the safety status assessment score is 0 points, and when T1 is between 60°C and 90°C, the score is assigned according to the linear interpolation from 0 to 100.

[0079] It should be noted that the above-mentioned implementation method of linearly interpolating and assigning the thermal runaway trigger temperature obtained by the thermal runaway test to obtain the second corresponding relationship is only an example. In some embodiments, other methods can also be used to obtain the second corresponding relationship. For example, the second corresponding relationship can be set according to the experience of battery status monitoring technicians. The embodiment of the present invention does not impose specific limitations on this.

[0080] It should be noted that the same multiple batteries may be used to determine the first correspondence relationship and the second correspondence relationship, or different multiple batteries may be used to determine the first correspondence relationship and the second correspondence relationship, and the embodiment of the present invention does not impose specific limitations on this.

[0081] S132: Determine a target safety status assessment score corresponding to the battery to be assessed according to the target thermal runaway trigger temperature and based on the second corresponding relationship.

[0082] Specifically, after the target thermal runaway trigger temperature of the battery to be evaluated is obtained, the target safety status evaluation score corresponding to the battery to be evaluated can be calculated using the above formula (2).

[0083] It can be understood that the embodiment of the present invention uses the thermal runaway trigger temperature as a safety status scoring standard and quantifies the evaluation results of the battery safety status, so as to effectively evaluate the safety status of the battery before and after use and improve the accuracy of the evaluation results.

[0084] In some embodiments, the Figure 3 , the method may further include:

[0085] S133: Determine the safety warning level corresponding to the battery to be evaluated according to the target safety status evaluation score.

[0086] In the embodiment of the present invention, the safety level of the battery can be divided according to the safety status evaluation score of the battery.

[0087] Specifically, determining the safety warning level corresponding to the battery to be evaluated based on the target safety status assessment score may include: if the target safety status assessment score is greater than or equal to the first score, determining that the battery to be evaluated is in a safe state; if the target safety status assessment score is greater than or equal to the second score and less than the first score, determining that the safety warning level is a third-level warning; if the target safety status assessment score is greater than or equal to the third score and less than the second score, determining that the safety warning level is a second-level warning; if the target safety status assessment score is less than the third score, determining that the safety warning level is a first-level warning.

[0088] The first score, the second score and the second score may be preset according to actual conditions, for example, they may be set to 80 points, 50 points and 20 points respectively, and the embodiment of the present invention does not impose any specific limitation on this.

[0089] S134: Perform graded restrictions on the batteries to be evaluated according to the safety warning level.

[0090] In the embodiment of the present invention, early warning and maintenance can be performed on the battery to be evaluated according to the classified safety levels.

[0091] Specifically, the battery to be evaluated is subject to graded restrictions according to the safety warning level, which may include: if the safety warning level is the third warning level, limiting the maximum operating temperature of the battery to be evaluated to a first temperature; if the safety warning level is the second warning level, limiting the maximum operating temperature of the battery to be evaluated to a second temperature; if the safety warning level is the first warning level, controlling the battery to be evaluated to stop working.

[0092] The first temperature may be greater than the second temperature, and the first temperature and the second temperature may be preset according to actual conditions, for example, they may be set to 55° C. and 50° C. respectively, and the embodiment of the present invention does not impose any specific limitation on this.

[0093] Exemplarily, assuming that the first score, the second score and the second score are set to 80 points, 50 points and 20 points, and the first temperature and the second temperature are set to 55° C. and 50° C., it can be determined that:

[0094] When the target safety status assessment score X is ≥ 80 points, the battery to be assessed is in a safe state, and there is no need for early warning and maintenance of the battery to be assessed;

[0095] When 50 points ≤ target safety status assessment score X < 80 points, the safety warning level corresponding to the battery to be assessed is level 3 warning, and the maximum operating temperature of the battery to be assessed is limited to 55°C;

[0096] When 20 points ≤ target safety status assessment score X < 50 points, the safety warning level corresponding to the battery to be assessed is level 2 warning, and the maximum operating temperature of the battery to be assessed is limited to 50°C;

[0097] When the target safety status assessment score X is less than 20 points, the safety warning level corresponding to the battery to be assessed is a level one warning, and the battery to be assessed is controlled to stop working.

[0098] It can be understood that in the embodiment of the present invention, by performing more accurate risk level classification based on the evaluation result of the battery safety status, reasonable decision guidance can be made for battery maintenance.

[0099] The following is a detailed description of a method for constructing a first corresponding relationship between the SOH value and the thermal runaway trigger temperature.

[0100] Reference Manual Attached Figure 4 , which shows a construction process of a first correspondence relationship provided by an embodiment of the present invention. Figure 4 As shown, the process may include the following steps:

[0101] S410: Acquire multiple batteries with different health status values.

[0102] In the embodiment of the present invention, the battery can be aged quickly by the battery aging method, thereby obtaining multiple batteries with different SOH values. For example, the battery can be charged at a constant current to a cut-off voltage at 45°C, and then discharged at a constant current to a cut-off voltage, thereby aging the battery SOH to different SOH values.

[0103] In the embodiment of the present invention, the multiple batteries with different SOH values ​​may include not only aged batteries but also fresh batteries (i.e., batteries with SOH values ​​of 100%). The number of batteries with different SOH values ​​and the SOH values ​​of the batteries may be determined according to actual conditions, and the embodiment of the present invention does not impose any specific restrictions on this.

[0104] For example, at 45°C, the battery can be charged to 3.4V at 1.0C constant current, then charged to 3.65V at 0.8C constant current to 0.05C cut-off voltage, and then discharged to 2.5V at 2.0C constant current, and the battery SOH value can be aged to 90%, 80%, 70%, 60%, etc. The method for determining the SOH value of the battery can refer to Figure 1 The relevant contents in the illustrated embodiments will not be described in detail in the embodiments of the present invention.

[0105] It can be understood that the embodiment of the present invention uses a specific battery aging method to age the battery to different SOHs, and then performs a thermal runaway test on the battery before and after aging to establish a correlation between the battery SOH value and the thermal runaway trigger temperature. The data reliability is high and can ensure the efficiency and accuracy of the battery safety status assessment.

[0106] S420: Perform thermal runaway tests on multiple batteries with different health status values ​​respectively, and record corresponding thermal runaway trigger temperatures.

[0107] In the embodiment of the present invention, based on the national standard "Lithium-ion Batteries for Power Energy Storage" (GBT36276-2023), thermal runaway tests can be performed on multiple batteries with different health status values, and thermal safety characteristic values ​​such as the thermal runaway trigger temperature of the thermal runaway test can be extracted. Among them, the thermal runaway trigger temperature can be defined as the temperature when the temperature rise rate of the battery's self-generated heat exceeds 0.02°C / min, the temperature when three temperature rise rates are continuously monitored to be ≥3°C / s, the temperature at the time of fire, or the temperature at the time of explosion, etc. The embodiment of the present invention does not impose specific restrictions on this.

[0108] For example, during the thermal runaway test, the surface temperature data of the battery can be recorded to obtain the following Figure 5 The temperature curve shown in Figure 2 is shown in Figure 2. Differentiating the obtained temperature curve, we can get the curve of the surface temperature rise rate. According to the temperature rise rate, the thermal runaway can be divided into several stages. Figure 5 As shown, thermal runaway can be divided into three stages: I, II and III. In stage I, the temperature rise rate is less than the first rate (e.g., 0.02°C / min). When overcharged to stage II, the temperature rise rate quickly rises to the second rate (e.g., 1°C / min). As overcharging continues, the temperature rise rate rises rapidly, and before the battery thermal runaway occurs, the temperature rise rate is as high as the third rate (i.e., the highest temperature rise rate during the entire test process) until the maximum thermal runaway temperature Tmax is reached. Specifically, the temperature at the end of stage I (i.e., the temperature at the beginning of stage II) can be used as the thermal runaway trigger temperature.

[0109] S430: According to a plurality of batteries with different health status values ​​and their corresponding thermal runaway trigger temperatures, a first corresponding relationship between the health status value and the thermal runaway trigger temperature is obtained by fitting.

[0110] In the embodiment of the present invention, the first corresponding relationship may be a functional corresponding relationship as shown in formula (1), and a linear fitting method may be used to fit the functional corresponding relationship between the SOH value and the thermal runaway trigger temperature according to the acquired SOH values ​​and thermal runaway trigger temperatures corresponding to the multiple batteries. The specific fitting method may refer to the existing linear fitting method, and the embodiment of the present invention will not be described in detail here.

[0111] In practical applications, refer to the attached manual. Figure 6 In step S610, a plurality of fresh batteries may be first obtained. In step S620, a thermal runaway test may be first performed on the fresh battery to obtain the thermal runaway trigger temperature corresponding to the fresh battery. Then, in step S630, the electrochemical parameters such as the capacity and energy of the fresh battery may be measured to obtain the capacity or energy of the fresh battery for determining the SOH value of the aged battery. In step S640, the fresh battery may be subjected to cyclic aging / high temperature storage and other treatments, and in step S650, the electrochemical parameters such as the capacity and energy of the treated battery may be measured to determine the corresponding SOH value. Specifically, cyclic aging / high temperature storage and other treatments may be performed once or multiple times to obtain aged batteries with different SOH values. Thereafter, in step S660, thermal runaway tests may be performed on batteries with different SOH values ​​respectively to obtain the corresponding thermal runaway trigger temperatures. In step S670, the results of the fresh battery and the aged battery may be compared, and then in step S680, a first corresponding relationship between the battery SOH value and the thermal runaway trigger temperature as shown in formula (1) may be constructed.

[0112] For example, in conjunction with the reference specification Figure 7 , assuming that the thermal runaway trigger temperatures corresponding to multiple batteries with SOH values ​​of 100%, 90%, 80% and 70% are 95℃, 92℃, 76℃ and 68℃ respectively. Then we can construct the following Figure 7 The first corresponding relationship between the battery SOH value and the thermal runaway trigger temperature is shown.

[0113] It can be understood that the embodiment of the present invention implements thermal runaway tests on batteries with different SOH values, and constructs a correlation between the battery SOH and thermal safety during the life cycle based on the thermal runaway trigger temperature obtained during the thermal runaway test. The battery safety can then be evaluated based on the constructed correlation, thereby improving the efficiency and accuracy of the battery safety status assessment, and eliminating the need for destructive testing of the battery during the evaluation process, thereby saving costs and having good applicability and robustness.

[0114] Reference Manual Attached Figure 8 , which shows the structure of a battery safety status assessment device 800 provided by an embodiment of the present invention. Figure 8 As shown, the apparatus 800 may include:

[0115] An acquisition module 810 is used to acquire a target health status value of a battery to be evaluated;

[0116] A determination module 820, configured to determine a target thermal runaway trigger temperature corresponding to the battery to be evaluated according to the target health state value and based on a first correspondence between a preset health state value and a thermal runaway trigger temperature;

[0117] The evaluation module 830 is used to perform a safety status evaluation on the battery to be evaluated according to the target thermal runaway trigger temperature to obtain a corresponding evaluation result.

[0118] In some embodiments, the apparatus 800 may further include:

[0119] A corresponding relationship determination module, used to predetermine a first corresponding relationship between a health state value and a thermal runaway trigger temperature;

[0120] The corresponding relationship determination module may include:

[0121] An acquisition unit, used for acquiring a plurality of batteries having different health status values;

[0122] A thermal runaway test unit, used to perform thermal runaway tests on multiple batteries with different health status values, and record the corresponding thermal runaway trigger temperatures;

[0123] The corresponding relationship fitting unit is used to fit a first corresponding relationship between the health state value and the thermal runaway trigger temperature according to a plurality of batteries with different health state values ​​and their corresponding thermal runaway trigger temperatures.

[0124] It should be noted that the device provided in the above embodiment, when implementing its functions, only uses the division of the above functional modules as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device provided in the above embodiment and the corresponding method embodiment belong to the same concept, and the specific implementation process is detailed in the corresponding method embodiment, which will not be repeated here.

[0125] An embodiment of the present invention also provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement a battery safety status assessment method provided in the above method embodiment.

[0126] The memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory can also include a memory controller to provide the processor with access to the memory.

[0127] In conjunction with the reference manual Fig. 9 , which is a block diagram of an electronic device 900 according to an embodiment of the present invention. The electronic device 900 may include one or more processors 902, a system control logic 908 connected to at least one of the processors 902, a system memory 904 connected to the system control logic 908, a non-volatile memory (NVM) 906 connected to the system control logic 908, and a network interface 910 connected to the system control logic 908.

[0128] The processor 902 may include one or more single-core or multi-core processors. The processor 902 may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors, application processors, baseband processors, etc.). In the embodiments of the present invention, the processor 902 may be configured to execute the following: Figures 1 to 7 One or more of the various embodiments shown.

[0129] In some embodiments, system control logic 908 may include any suitable interface controller to provide any suitable interface to at least one of processors 902 and / or any suitable device or component in communication with system control logic 908 .

[0130] In some embodiments, the system control logic 908 may include one or more memory controllers to provide an interface to the system memory 904. The system memory 904 may be used to load and store data and / or instructions. In some embodiments, the memory 904 of the device 900 may include any suitable volatile memory, such as a suitable dynamic random access memory (DRAM).

[0131] NVM / memory 906 may include one or more tangible, non-transitory computer-readable media for storing data and / or instructions. In some embodiments, NVM / memory 906 may include any suitable non-volatile memory such as flash memory and / or any suitable non-volatile storage device, such as at least one of a HDD (Hard Disk Drive), a CD (Compact Disc) drive, and a DVD (Digital Versatile Disc) drive.

[0132] NVM / storage 906 may include a portion of storage resources installed on a device of apparatus 900, or it may be accessible to the apparatus but not necessarily a part of the apparatus. For example, NVM / storage 906 may be accessed over a network via network interface 910.

[0133] In particular, system memory 904 and NVM / storage 906 may include, respectively, a temporary copy and a permanent copy of instructions 920. Instructions 920 may include instructions that, when executed by at least one of processors 902, cause device 900 to perform the following operations: Figures 1 to 7 Instructions of the battery safety status assessment method shown. In some embodiments, instructions 920, hardware, firmware and / or software components thereof may be additionally / alternatively placed in system control logic 908, network interface 910 and / or processor 902.

[0134] The network interface 910 may include a transceiver for providing a radio interface for the device 900, thereby communicating with any other suitable device (such as a front-end module, an antenna, etc.) through one or more networks. In some embodiments, the network interface 910 may be integrated with other components of the device 900. For example, the network interface 910 may be integrated with at least one of a communication module of the processor 902, a system memory 904, an NVM / storage 906, and a firmware device (not shown) having instructions. When at least one of the processors 902 executes the instructions, the device 900 implements Figures 1 to 7 One or more of the various embodiments shown.

[0135] The network interface 910 may further include any suitable hardware and / or firmware to provide a multiple-input multiple-output radio interface. For example, the network interface 910 may be a network adapter, a wireless network adapter, a telephone modem and / or a wireless modem.

[0136] In one embodiment, at least one of the processors 902 may be packaged together with logic for one or more controllers of the system control logic 908 to form a system in package (SiP). In one embodiment, at least one of the processors 902 may be integrated on the same die with logic for one or more controllers of the system control logic 908 to form a system on chip (SoC).

[0137] The device 900 may further include an input / output (I / O) device 912. The I / O device 912 may include a user interface to enable a user to interact with the device 900; the design of the peripheral component interface enables the peripheral components to interact with the device 900. In some embodiments, the device 900 further includes a sensor for determining at least one of an environmental condition and location information related to the device 900.

[0138] In some embodiments, the user interface may include, but is not limited to, a display (e.g., an LCD display, a touch screen display, etc.), a speaker, a microphone, one or more cameras (e.g., a still image camera and / or a video camera), a flashlight (e.g., an LED flash), and a keyboard.

[0139] In some embodiments, the peripheral component interface may include, but is not limited to, a non-volatile memory port, an audio jack, and a power interface.

[0140] In some embodiments, the sensors may include, but are not limited to, gyroscope sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. The positioning unit may also be part of or interact with the network interface 910 to communicate with components of a positioning network (e.g., global positioning system (GPS) satellites).

[0141] It is to be understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the electronic device 900. In other embodiments of the present invention, the electronic device 900 may include more or fewer components than shown in the figure, or combine some components, or separate some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0142] An embodiment of the present invention also provides a computer-readable storage medium, which can be set in an electronic device to store at least one instruction or at least one program related to implementing a battery safety status assessment method. The at least one instruction or the at least one program is loaded and executed by the processor to implement the battery safety status assessment method provided by the above method embodiment.

[0143] Optionally, in an embodiment of the present invention, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store program codes.

[0144] One embodiment of the present invention also provides a computer program product, which includes a computer program / instructions. When the computer program product is run on an electronic device, the computer program / instructions are loaded and executed by a processor to implement the steps of the battery safety status assessment method provided in the various optional embodiments above.

[0145] It should be noted that the sequence of the embodiments of the present invention described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0146] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0147] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery safety status assessment method, characterized in that: The method comprises: Obtain the target health status value of the battery to be evaluated; According to the target health state value, based on a first corresponding relationship between a preset health state value and a thermal runaway trigger temperature, determining a target thermal runaway trigger temperature corresponding to the battery to be evaluated; A safety status assessment is performed on the battery to be assessed according to the target thermal runaway trigger temperature to obtain a corresponding assessment result.

2. The method according to claim 1, characterized in that The step of obtaining a target health status value of the battery to be evaluated includes: Measuring the battery capacity or battery energy of the battery to be evaluated during actual operation; The target health status value is calculated according to the battery capacity or the battery energy.

3. The method according to claim 1, characterized in that The step of performing safety status assessment on the battery to be assessed according to the target thermal runaway trigger temperature includes: Obtaining a second corresponding relationship between a preset thermal runaway trigger temperature and a safety state assessment score; According to the target thermal runaway trigger temperature and based on the second corresponding relationship, a target safety status assessment score corresponding to the battery to be assessed is determined.

4. The method according to claim 3, characterized in that: The method further comprises: Determining a safety warning level corresponding to the battery to be evaluated according to the target safety status evaluation score; The battery to be evaluated is graded and restricted according to the safety warning level.

5. The method according to claim 4, characterized in that The step of determining the safety warning level corresponding to the battery to be evaluated according to the target safety status evaluation score includes: If the target safety status assessment score is greater than or equal to a first score, determining that the battery to be assessed is in a safe state; If the target safety status assessment score is greater than or equal to the second score and less than the first score, determining the safety warning level to be a level three warning; If the target safety status assessment score is greater than or equal to the third score and less than the second score, determining the safety warning level to be a level 2 warning; If the target safety status assessment score is less than the third score, the safety warning level is determined to be a level one warning.

6. The method according to claim 4, characterized in that The step of performing graded restrictions on the battery to be evaluated according to the safety warning level includes: If the safety warning level is level three, limiting the maximum operating temperature of the battery to be evaluated to a first temperature; If the safety warning level is level 2 warning, limiting the maximum operating temperature of the battery to be evaluated to a second temperature; If the safety warning level is level one, the battery to be evaluated is controlled to stop working.

7. The method according to claim 1, characterized in that The method further includes predetermining a first corresponding relationship between the health state value and the thermal runaway trigger temperature, including: Get multiple batteries with different health status values; Performing thermal runaway tests on the multiple batteries with different health status values ​​respectively, and recording corresponding thermal runaway trigger temperatures; According to the multiple batteries with different health state values ​​and their corresponding thermal runaway trigger temperatures, a first corresponding relationship between the health state value and the thermal runaway trigger temperature is obtained by fitting.

8. A battery safety status assessment device, characterized in that: The device comprises: An acquisition module, used to obtain a target health status value of a battery to be evaluated; a determination module, configured to determine, according to the target health state value and based on a first corresponding relationship between a preset health state value and a thermal runaway trigger temperature, a target thermal runaway trigger temperature corresponding to the battery to be evaluated; The evaluation module is used to perform a safety status evaluation on the battery to be evaluated according to the target thermal runaway trigger temperature to obtain a corresponding evaluation result.

9. An electronic device, characterized in that: The electronic device includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement the battery safety status assessment method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement the battery safety status assessment method according to any one of claims 1 to 7.

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