Boundary temperature reliability verification method and device, electronic equipment and storage medium

Abstract

The application discloses a boundary temperature reliability verification method and device, electronic equipment and a storage medium. The boundary temperature reliability verification method comprises the following steps: determining a target charging strategy required for an electric core to reach a target boundary temperature; and verifying the reliability of the target boundary temperature for the electric core according to the target charging strategy. In the embodiment of the application, the association between the charging strategy and the boundary temperature is established, the boundary temperature which is difficult to detect and study is converted into an executable charging strategy by determining the target charging strategy required for the electric core to reach the target boundary temperature, the operability of the boundary temperature setting is improved, the reliability of the target boundary temperature is ensured by verifying the reliability of the target boundary temperature for the electric core according to the target charging strategy, and the accuracy and rationality of the target boundary temperature are improved.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a boundary temperature reliability verification method, apparatus, electronic device, and storage medium. Background Technology

[0002] With the development of new energy vehicles and energy storage systems, lithium-ion batteries have been widely used due to their advantages such as high energy density and long cycle life. The performance and safety of a battery are highly dependent on its operating temperature; when the battery cell operates within a reasonable temperature range, a balance between cycle life, performance, and safety can be maintained.

[0003] With the development of supercharging technology, the heat generated by battery cells increases dramatically during high-rate charging. Therefore, determining the safe boundary temperature of the battery cell and designing charging control strategies accordingly has become crucial to ensuring battery safety and improving system lifespan. Currently, boundary temperatures are usually set based on experience or conservative estimates, resulting in low accuracy and poor rationality. Summary of the Invention

[0004] The purpose of this application is to provide a boundary temperature reliability verification method, apparatus, electronic device, and storage medium that can solve the problems of low accuracy and poor rationality of boundary temperature.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide a boundary temperature reliability verification method, the method comprising: Determine the target charging strategy required to bring the cell's internal temperature to the target boundary temperature; Based on the target charging strategy, verify the reliability of the target boundary temperature for the battery cell.

[0006] Optionally, determining the target charging strategy required to bring the cell's interior to the target boundary temperature includes: The highest internal temperature of the battery cell was recorded during the charging process using multiple different test charging strategies. Based on the test charging strategy and the first internal maximum temperature, a correlation between the charging strategy and the internal maximum temperature is generated; The charging strategy corresponding to the target boundary temperature is determined based on the correlation relationship, and is used as the target charging strategy.

[0007] Optionally, after determining the target charging strategy required to bring the cell interior to the target boundary temperature, the method further includes: The second highest internal temperature of the battery cell is collected during the charging process using the target charging strategy. When the difference between the target boundary temperature and the second internal maximum temperature does not meet the target condition, the target charging strategy is adjusted, and the process of collecting the second internal maximum temperature of the battery cell during the charging process using the target charging strategy is returned.

[0008] Optionally, verifying the reliability of the target boundary temperature for the battery cell according to the target charging strategy includes: The target charging strategy is used to perform cyclic testing on the battery cell until the battery cell reaches the end of its lifespan. Reliability verification is performed on battery cells that have reached the end of their lifespan. If the reliability verification passes, then the target boundary temperature is determined to be reliable for the battery cell.

[0009] Optionally, the reliability verification of the battery cell that has reached the end of its life includes: structural reliability verification of the battery cell that has reached the end of its life.

[0010] Optionally, the reliability verification of the battery cell that has reached the end of its life includes: thermal safety reliability verification of the battery cell that has reached the end of its life.

[0011] Secondly, embodiments of this application provide a boundary temperature reliability verification device, the device comprising: The determination module is used to determine the target charging strategy required to bring the internal temperature of the battery cell to the target boundary temperature. The verification module is used to verify the reliability of the target boundary temperature for the battery cell according to the target charging strategy.

[0012] Optionally, the determining module is specifically used for: The highest internal temperature of the battery cell was recorded during the charging process using multiple different test charging strategies. Based on the test charging strategy and the first internal maximum temperature, a correlation between the charging strategy and the internal maximum temperature is generated; The charging strategy corresponding to the target boundary temperature is determined based on the correlation relationship, and is used as the target charging strategy.

[0013] Optionally, the device further includes: An adjustment module is used to collect the second highest internal temperature of the battery cell during the charging process using the target charging strategy; when the difference between the target boundary temperature and the second highest internal temperature does not meet the target condition, the target charging strategy is adjusted, and the process returns to the step of collecting the second highest internal temperature of the battery cell during the charging process using the target charging strategy.

[0014] Optionally, the verification module is specifically used for: The target charging strategy is used to perform cyclic testing on the battery cell until the battery cell reaches the end of its lifespan. Reliability verification is performed on battery cells that have reached the end of their lifespan. If the reliability verification passes, then the target boundary temperature is determined to be reliable for the battery cell.

[0015] Optionally, the verification module includes: a first verification unit, used to perform structural reliability verification on cells that have reached the end of their lifespan.

[0016] Optionally, the verification module includes a second verification unit for performing thermal safety and reliability verification on cells that have reached the end of their lifespan.

[0017] Thirdly, embodiments of this application provide an electronic device, which includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the boundary temperature reliability verification method as described in any of the preceding claims.

[0018] Fourthly, embodiments of this application provide a readable storage medium storing a program or instructions that, when executed by a processor, implement the boundary temperature reliability verification method as described in any of the preceding claims.

[0019] Fifthly, embodiments of this application provide a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the boundary temperature reliability verification method as described in any of the preceding claims.

[0020] In this embodiment, a target charging strategy required to bring the cell's interior to a target boundary temperature is first determined. Then, the reliability of the target boundary temperature for the cell is verified based on the target charging strategy. Therefore, this embodiment establishes a correlation between the charging strategy and the boundary temperature. By determining the target charging strategy required to bring the cell's interior to the target boundary temperature, the difficult-to-detect and study boundary temperature is transformed into an executable charging strategy, improving the operability of boundary temperature setting. By verifying the reliability of the target boundary temperature for the cell based on the target charging strategy, the set target boundary temperature is ensured to be a verified reliable value, improving the accuracy and rationality of the target boundary temperature.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some drawings of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart of a boundary temperature reliability verification method according to an embodiment of this application; Figure 2 This is a structural block diagram of a boundary temperature reliability verification device according to an embodiment of this application; Figure 3 This is a structural block diagram of an electronic device according to an embodiment of this application; Figure 4 This is a structural block diagram of a readable storage medium according to an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example 1: Reference Figure 1 The diagram shows a flowchart of a boundary temperature reliability verification method according to an embodiment of this application.

[0026] like Figure 1 As shown, the boundary temperature reliability verification method may include the following steps: Step 101: Determine the target charging strategy required to bring the cell interior to the target boundary temperature.

[0027] In this embodiment, by establishing a correlation between the charging strategy and the highest internal temperature of the battery cell, the target charging strategy required to bring the battery cell to the target boundary temperature can be determined. This transforms the difficult-to-detect and study target boundary temperature into an executable and controllable target charging strategy. The target charging strategy serves as the input condition for subsequent verification work, ensuring the rationality of the verification process.

[0028] In this embodiment, the target boundary temperature refers to the preset maximum internal temperature limit of the battery cell that is to be verified. The target charging strategy refers to the charging rate required to achieve the aforementioned target boundary temperature. The charging rate is a core indicator for measuring battery charging speed, referring to the ratio of charging capacity per unit time to the battery's nominal capacity.

[0029] Step 102: Verify the reliability of the target boundary temperature for the battery cell according to the target charging strategy.

[0030] In this embodiment of the application, the target boundary temperature is verified according to the target charging strategy corresponding to the target boundary temperature, thereby verifying the reliability of the target boundary temperature for the battery cell.

[0031] For example, the target charging strategy can be applied to the battery cell, and then various evaluation methods can be used to verify whether the battery cell will cause serious performance degradation or safety risks under the target charging strategy, thereby determining whether the target boundary temperature is truly reliable.

[0032] In this embodiment, a correlation between charging strategy and boundary temperature is established. By determining the target charging strategy required to bring the cell to the target boundary temperature, the boundary temperature, which is difficult to detect and study, is transformed into an executable charging strategy, thereby improving the operability of boundary temperature setting. By verifying the reliability of the target boundary temperature for the cell according to the target charging strategy, it is ensured that the set target boundary temperature is a verified reliable value, thus improving the accuracy and rationality of the target boundary temperature.

[0033] Example 2: In one optional implementation, the process of determining the target charging strategy required to bring the battery cell's interior to a target boundary temperature may include: collecting a first maximum internal temperature of the battery cell during charging using multiple different test charging strategies; generating a correlation between the charging strategy and the first maximum internal temperature based on the test charging strategies and the first maximum internal temperature; and determining the charging strategy corresponding to the target boundary temperature based on the correlation, as the target charging strategy. In this embodiment, by collecting multiple different test charging strategies and their corresponding first maximum internal temperatures and establishing a correlation, this correlation accurately reflects the relationship between the test charging strategies and the first maximum internal temperature, ensuring that the target charging strategy can accurately and repeatedly bring the battery cell's interior to the preset target boundary temperature, providing precise input conditions for subsequent reliability verification.

[0034] In this embodiment, a battery cell with a built-in temperature sensor is prepared. For example, a battery cell of the specification to be tested can be selected, and a temperature sensor (such as a thermocouple) can be pre-placed at a target location inside the cell (such as the center of the core or the root of the tab). After encapsulation, a test sample capable of real-time monitoring of the internal temperature is formed, which is the battery cell involved in this embodiment.

[0035] In this embodiment, the battery cell is subjected to charging tests, and multiple sets of test data are collected. For example, at a selected ambient temperature, the battery cell is charged using multiple different test charging strategies, and the highest internal temperature of the battery cell during the charging process using these strategies is collected; that is, a corresponding highest internal temperature is collected for each test charging strategy. For example, at a selected ambient temperature T... env At a temperature of 45~55℃, the battery cell is subjected to multiple different charging tests (e.g., charging tests C1, C2, and C3), and the first highest internal temperature reached by the battery cell under each charging test is recorded (e.g., the first highest internal temperature is T1, T2, and T3).

[0036] In this embodiment, the collected test data is used to establish a correlation between the charging strategy and the highest internal temperature. For example, data fitting is performed based on the tested charging strategy and the first highest internal temperature to generate a correlation between the charging strategy and the highest internal temperature. For instance, data fitting is performed on multiple corresponding sets of tested charging strategies and the first highest internal temperature (e.g., linear regression or polynomial fitting can be used, with a correlation coefficient R² ≥ 0.95), and a correlation curve (i.e., the correlation relationship) T = f(C, T) is plotted between the charging strategy C and the highest internal temperature T. env ).

[0037] In this embodiment, the charging strategy corresponding to the target boundary temperature is determined based on the aforementioned correlation, and this strategy is used as the target charging strategy. For example, the correlation curve between the charging strategy and the highest internal temperature is T=f(C, T). env Then the target boundary temperature T target Substitute into the correlation curve and solve for f(C). target T env )= T target Thus, the target boundary temperature T is obtained. target The target charging strategy C required at that time target .

[0038] Example 3: In one optional embodiment, after determining the target charging strategy required to bring the cell's internal temperature to the target boundary, the method further includes: acquiring a second maximum internal temperature of the cell during the charging process using the target charging strategy; adjusting the target charging strategy when the difference between the target boundary temperature and the second maximum internal temperature does not meet the target condition, and returning to the step of acquiring the second maximum internal temperature of the cell during the charging process using the target charging strategy; and stopping the adjustment of the target charging strategy when the difference between the target boundary temperature and the second maximum internal temperature meets the target condition. In this embodiment, considering that the target charging strategy derived from the correlation is a theoretical value, but due to fitting errors, individual cell differences, and test system fluctuations, directly using the target charging strategy may result in a deviation between the actual maximum internal temperature and the target boundary temperature, this deviation can be quantitatively evaluated through further actual measurement, and the target charging strategy can be dynamically adjusted to ensure that the maximum internal temperature of the cell can be accurately and repeatably controlled at the preset target boundary temperature.

[0039] In this embodiment, the target charging strategy is used again to charge the battery cell. During the charging process, the second highest internal temperature of the battery cell is collected. The difference between the target boundary temperature and the second highest internal temperature is calculated. If the difference does not meet the target condition, the target charging strategy is adjusted, and the adjusted target charging strategy is used again to charge the battery cell. The second highest internal temperature of the battery cell is collected during the charging process, and the difference between the target boundary temperature and the second highest internal temperature is calculated. This process is repeated until the difference meets the target condition. Alternatively, an iteration threshold can be set. If the number of iterations exceeds the threshold, iteration stops. If the difference still does not meet the target condition, the association can be re-established.

[0040] The target condition can be that the difference is less than a difference threshold, which can be set according to actual needs, such as 1℃, 2℃, etc. The iteration number threshold can also be set according to actual needs, such as 3 iterations, 5 iterations, etc.

[0041] Example 4: In one optional implementation, the process of verifying the reliability of the target boundary temperature for the battery cell according to the target charging strategy may include: performing cyclic testing on the battery cell using the target charging strategy until the battery cell reaches the end-of-life state; performing reliability verification on the battery cell that has reached the end-of-life state; if the reliability verification passes, then the target boundary temperature is determined to be reliable for the battery cell; if the reliability verification fails, then the target boundary temperature is determined to be unreliable for the battery cell. In this embodiment, considering that boundary temperature settings are often based on the stability of BOL (Beginning of Life), and lack evaluation of the battery cell at EOL (End of Life) under extreme temperatures, the reliability verification of the battery cell that has reached the end-of-life state is performed in conjunction with the full life cycle cyclic testing of the battery cell, thereby avoiding the risk that the battery cell is safe in the initial life stage but unsafe in the end-of-life stage.

[0042] In this embodiment, the target charging strategy is used to perform cyclic testing on the battery cell until the battery cell reaches the end of its lifespan. For example, at the selected ambient temperature, the target charging strategy is used to perform cyclic charge-discharge testing on the battery cell. RPT (Reference Performance Test) is performed at set intervals (e.g., every 100 or 200 cycles) to monitor the changes in the battery cell's SOH (State of Health, capacity retention rate) and / or internal resistance. When the SOH of the battery cell is less than or equal to a capacity retention rate threshold and / or the internal resistance is greater than or equal to an internal resistance threshold, the battery cell is determined to have reached the end of its lifespan.

[0043] The capacity retention rate threshold and the internal resistance threshold can be set according to actual needs, and this embodiment does not impose any restrictions on them. For example, the capacity retention rate threshold can be 80%, 70%, etc., and the internal resistance threshold can be 1.5 times the initial internal resistance, 2 times the initial internal resistance, etc.

[0044] Example 5: In one alternative implementation, the process of verifying the reliability of a battery cell that has reached the end of its lifespan may include: performing structural reliability verification on the battery cell that has reached the end of its lifespan.

[0045] For example, the process of verifying the structural reliability of a battery cell that has reached the end of its lifespan may include: performing macroscopic structural reliability verification on the battery cell that has reached the end of its lifespan, and / or performing microscopic structural reliability verification on the battery cell that has reached the end of its lifespan; if the macroscopic structural reliability verification passes and / or the microscopic structural reliability verification passes, the structural reliability verification is determined to have passed; otherwise, the structural reliability verification is determined to have failed.

[0046] For example, during the macroscopic structural reliability verification of a battery cell that has reached the end of its lifespan, an external force (such as vibration or impact) can be applied to the battery cell to observe whether the structure of the battery cell fails after the external force is applied, such as whether there are internal / external cracks or leakage. If the structure of the battery cell does not fail after the external force is applied, the macroscopic structural reliability verification is determined to be passed; otherwise, the macroscopic structural reliability verification is determined to be failed.

[0047] For example, during the microstructure reliability verification of a battery cell that has reached the end of its lifespan, the battery cell can be disassembled in an inert atmosphere (such as a glove box); SEM (Scanning Electron Microscope) detection results can be obtained, and / or XRD (X-ray Diffraction) detection results can be obtained; if the SEM detection results are reliable, and / or the XRD detection results are reliable, the microstructure reliability verification is determined to be passed; otherwise, the microstructure reliability verification is determined to be failed.

[0048] For example, in the process of obtaining SEM detection results using SEM, at least one of the following is observed using SEM: whether the positive electrode material particles are broken, whether there is lithium plating on the negative electrode surface, and whether the SEI (Solid-Electrolyte Interphase) film is thickened or ruptured. If at least one of the following is met: the positive electrode material particles are not broken, there is no lithium plating on the negative electrode surface, and the SEI film is not thickened or ruptured, then the SEM detection results are determined to be reliable; otherwise, the SEM detection results are determined to be unreliable.

[0049] For example, in the process of obtaining XRD detection results using XRD detection, XRD analysis is used to analyze the changes in the crystal structure of the positive and negative electrode materials to determine whether a phase transition exists. If no phase transition exists, the XRD detection results are determined to be reliable; otherwise, the XRD detection results are determined to be unreliable.

[0050] Example 6: In one alternative implementation, the process of verifying the reliability of a battery cell that has reached the end of its lifespan may include: performing thermal safety reliability verification on the battery cell that has reached the end of its lifespan.

[0051] In this embodiment, thermal safety and reliability verification is performed on battery cells that have reached the end of their lifespan. For example, an extreme thermal safety test is performed on the battery cells that have reached the end of their lifespan. Specifically, this may include performing an ARC (Accelerating Rate Calorimetry) test on the battery cells that have reached the end of their lifespan to obtain a first test result, and / or performing a hot box / gradient heating test on the battery cells that have reached the end of their lifespan to obtain a second test result. If the first test result is reliable, and / or the second test result is reliable, the thermal safety and reliability verification is determined to have passed; otherwise, the thermal safety and reliability verification is determined to have failed.

[0052] For example, during the process of obtaining the first test result by performing ARC testing on a battery cell that has reached the end of its lifespan, the self-generated heat initiation temperature and the thermal runaway trigger temperature are measured, and the thermal stability of the SEI film is analyzed. If the self-generated heat initiation temperature is less than a first temperature threshold and / or the thermal runaway trigger temperature is less than a second temperature threshold, then the first test result is determined to be reliable; otherwise, the first test result is determined to be unreliable.

[0053] For example, during the process of obtaining the second test result by performing a hot box / gradient heating test on a battery cell that has reached the end of its lifespan, the battery cell that has reached the end of its lifespan is placed in an environment with a set temperature (such as the target boundary temperature + safety margin) for a certain period of time, and the occurrence of fire or explosion is observed. If no fire or explosion occurs, the second test result is determined to be reliable; otherwise, the second test result is determined to be unreliable.

[0054] The following is an illustration using a specific example.

[0055] Sample preparation: Fabrication of pouch cells with built-in temperature sensors.

[0056] Model (Correlation) Establishment: The ambient temperature was set to 52℃. The battery cell was charged using test charging strategies of 1C, 1.5C, and 2C (specifically, charging rates), and the first maximum internal temperature under each test charging strategy was recorded. After fitting the correlation curves (correlation relationships) between the corresponding test charging strategies and the first maximum internal temperature, it was deduced that a target charging strategy of 1.75C is required to achieve the target boundary temperature of 60℃ inside the battery cell.

[0057] Verification: In a 52℃ environmental chamber, the battery cell was charged with a target charging strategy of 1.75C. The measured maximum internal temperature was stable at 60℃±1℃, which is in line with expectations.

[0058] Cycling: The battery cell is charged at an ambient temperature of 52℃ and a target charging strategy of 1.75C, and then discharged at a charging strategy of 1C until the battery cell reaches the end-of-life (EOL) state (e.g., SOH=80%).

[0059] Disassembly and analysis: Disassembling the EOL-state battery cell, SEM showed no obvious lithium dendrites on the negative electrode surface, and XRD showed that the changes in the positive electrode lattice parameters were within the allowable range.

[0060] Thermal safety verification: ARC testing was performed on cells in the EOL state, and it was found that the temperature was only 5°C lower than that in the BOL state, and no thermal runaway occurred during a 2-hour hot chamber test at 130°C.

[0061] Conclusion: It is confirmed that the battery cell operates reliably at an internal temperature of 60°C, and the high temperature alarm threshold or derating threshold of the BMS can be widened to the target boundary temperature.

[0062] In this embodiment, by establishing a correlation between the charging strategy and the highest internal temperature, the target boundary temperature is accurately located, making the boundary conditions repeatable and controllable. Combined with full life-cycle cycling, microphysical analysis, and thermal runaway testing, the usable boundary temperature of the cell is verified and broadened while ensuring safety, achieving a balance between performance and safety. An experimental verification process that can be directly used to set and correct BMS temperature control thresholds is provided, achieving a quantitative balance between performance and safety. This method can elevate the originally conservative boundary temperature control strategy to a higher level of boundary temperature, allowing for longer periods of high-power overcharging. A higher reliable boundary temperature means reduced power requirements for the cooling system, helping to reduce the energy consumption and weight of the thermal management system. Testing based on internal temperature rather than surface temperature avoids safety misjudgments caused by temperature lag. Thermal testing based on EOL cells avoids the risk that new batteries are safe but older batteries are not. The boundary temperature obtained through this method can be used as a BMS control parameter input to achieve real-time control of the charging strategy or cooling flow, thereby increasing the upper limit of the charging strategy or shortening the charging time while maintaining safety redundancy.

[0063] It should be noted that the boundary temperature reliability verification method involved in the above embodiments may include at least one of Embodiments 1 to 6. For example, Embodiment 1 can be implemented as an independent embodiment, Embodiment 1+2 can be implemented as an independent embodiment, Embodiment 1+3 can be implemented as an independent embodiment, Embodiment 1+2+3 can be implemented as an independent embodiment, Embodiment 1+4 can be implemented as an independent embodiment, Embodiment 1+2+4 can be implemented as an independent embodiment, Embodiment 1+3+4 can be implemented as an independent embodiment, Embodiment 1+2+3+4 can be implemented as an independent embodiment, Embodiment 1+4+5 can be implemented as an independent embodiment, Embodiment 1+2+4+5 can be implemented as an independent embodiment, Embodiment 1+3+4+5 can be implemented as an independent embodiment, and so on. Examples 1+2+3+4+5 can be implemented as independent embodiments, examples 1+4+6 can be implemented as independent embodiments, examples 1+2+4+6 can be implemented as independent embodiments, examples 1+3+4+6 can be implemented as independent embodiments, examples 1+2+3+4+6 can be implemented as independent embodiments, examples 1+4+5+6 can be implemented as independent embodiments, examples 1+2+4+5+6 can be implemented as independent embodiments, examples 1+3+4+5+6 can be implemented as independent embodiments, examples 1+2+3+4+5+6 can be implemented as independent embodiments, and so on, but are not limited to these examples, and will not be listed one by one here.

[0064] It should be noted that the boundary temperature reliability verification method provided in this application embodiment can be executed by a boundary temperature reliability verification device, or a control module within that device for executing the loading boundary temperature reliability verification method. This application embodiment uses the execution of the loading boundary temperature reliability verification method by a boundary temperature reliability verification device as an example to illustrate the boundary temperature reliability verification method provided in this application embodiment.

[0065] Reference Figure 2 The diagram shows a structural block diagram of a boundary temperature reliability verification device according to an embodiment of this application.

[0066] like Figure 2 As shown, the boundary temperature reliability verification device may include the following modules: The determination module 201 is used to determine the target charging strategy required to bring the internal temperature of the battery cell to the target boundary temperature. The verification module 202 is used to verify the reliability of the target boundary temperature for the battery cell according to the target charging strategy.

[0067] Optionally, the determining module 201 is specifically used for: The highest internal temperature of the battery cell was recorded during the charging process using multiple different test charging strategies. Based on the test charging strategy and the first internal maximum temperature, a correlation between the charging strategy and the internal maximum temperature is generated; The charging strategy corresponding to the target boundary temperature is determined based on the correlation relationship, and is used as the target charging strategy.

[0068] Optionally, the device further includes: An adjustment module is used to collect the second highest internal temperature of the battery cell during the charging process using the target charging strategy; when the difference between the target boundary temperature and the second highest internal temperature does not meet the target condition, the target charging strategy is adjusted, and the process returns to the step of collecting the second highest internal temperature of the battery cell during the charging process using the target charging strategy.

[0069] Optionally, the verification module 202 is specifically used for: The target charging strategy is used to perform cyclic testing on the battery cell until the battery cell reaches the end of its lifespan. Reliability verification is performed on battery cells that have reached the end of their lifespan. If the reliability verification passes, then the target boundary temperature is determined to be reliable for the battery cell.

[0070] Optionally, the verification module 202 includes: a first verification unit, used to perform structural reliability verification on battery cells that have reached the end of their lifespan.

[0071] Optionally, the verification module 202 includes a second verification unit for performing thermal safety and reliability verification on battery cells that have reached the end of their lifespan.

[0072] As the device embodiment is basically similar to the method embodiment, the description is relatively simple, and relevant parts can be found in the description of the method embodiment.

[0073] The boundary temperature reliability verification device in this application embodiment can be a device, or it can be a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, PDAs, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), televisions (TVs), ATMs, or self-service machines, etc., and this application embodiment does not specifically limit the scope.

[0074] The boundary temperature reliability verification device in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit it.

[0075] The boundary temperature reliability verification device provided in this application embodiment can realize the various processes implemented in the method embodiment of any of the above claims. To avoid repetition, it will not be described again here.

[0076] Optionally, embodiments of this application also provide an electronic device.

[0077] Reference Figure 3 The diagram shows a structural block diagram of an electronic device according to an embodiment of this application.

[0078] like Figure 3 As shown, the electronic device 11 includes a processor 111, a memory 112, and a program or instruction 1121 stored in the memory and executable on the processor. When the program or instruction 1121 is executed by the processor 111, it implements the various processes of any of the above-described boundary temperature reliability verification method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0079] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0080] Optionally, embodiments of this application also provide a readable storage medium.

[0081] Reference Figure 4 The diagram shows a structural block diagram of a readable storage medium according to an embodiment of this application.

[0082] like Figure 4 As shown, the readable storage medium 21 stores a program or instruction 211. When the program or instruction 211 is executed by the processor, it implements the various processes of any of the above boundary temperature reliability verification method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0083] The processor may be the processor in the electronic device described in the above embodiments.

[0084] Optionally, this application embodiment also provides a chip, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the various processes of the above-described boundary temperature reliability verification method embodiments, and achieving the same technical effect, so to avoid repetition, it will not be described again here.

[0085] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0086] The processors mentioned above may include, but are not limited to: Central Processing Unit (CPU), Network Processor (NP), Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0087] The aforementioned readable storage media include computer-readable storage media, which may include, but are not limited to: read-only memory (ROM), random access memory (RAM), compact disc read-only memory (CD-ROM), electronically erasable programmable read-only memory (EEPROM), hard disk, floppy disk, flash memory, etc.

[0088] The various embodiments in this specification are related to each other and are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0089] It should be noted that all actions involving the acquisition of signals, information, or data in this application are carried out in compliance with the relevant data protection laws and regulations of the locality and with authorization from the owner of the relevant device.

[0090] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0091] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0092] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0093] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms. The functional units in the various embodiments of this application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0094] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0095] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for verifying the reliability of boundary temperatures, characterized in that, The method includes: Determine the target charging strategy required to bring the cell's internal temperature to the target boundary temperature; Based on the target charging strategy, verify the reliability of the target boundary temperature for the battery cell.

2. The method according to claim 1, characterized in that, The determination of the target charging strategy required to bring the cell's internal temperature to the target boundary includes: The highest internal temperature of the battery cell was recorded during the charging process using multiple different test charging strategies. Based on the test charging strategy and the first internal maximum temperature, a correlation between the charging strategy and the internal maximum temperature is generated; The charging strategy corresponding to the target boundary temperature is determined based on the correlation relationship, and is used as the target charging strategy.

3. The method according to claim 1 or 2, characterized in that, After determining the target charging strategy required to bring the cell interior to the target boundary temperature, the method further includes: The second highest internal temperature of the battery cell is collected during the charging process using the target charging strategy. When the difference between the target boundary temperature and the second internal maximum temperature does not meet the target condition, the target charging strategy is adjusted, and the process of collecting the second internal maximum temperature of the battery cell during the charging process using the target charging strategy is returned.

4. The method according to any one of claims 1 to 3, characterized in that, The step of verifying the reliability of the target boundary temperature for the battery cell according to the target charging strategy includes: The target charging strategy is used to perform cyclic testing on the battery cell until the battery cell reaches the end of its lifespan. Reliability verification is performed on battery cells that have reached the end of their lifespan. If the reliability verification passes, then the target boundary temperature is determined to be reliable for the battery cell.

5. The method according to claim 4, characterized in that, The reliability verification of battery cells that have reached the end of their lifespan includes: Structural reliability verification is performed on battery cells that have reached the end of their lifespan.

6. The method according to claim 4 or 5, characterized in that, The reliability verification of battery cells that have reached the end of their lifespan includes: Thermal safety and reliability verification is performed on battery cells that have reached the end of their lifespan.

7. A boundary temperature reliability verification device, characterized in that, The device includes: The determination module is used to determine the target charging strategy required to bring the internal temperature of the battery cell to the target boundary temperature. The verification module is used to verify the reliability of the target boundary temperature for the battery cell according to the target charging strategy.

8. The apparatus according to claim 7, characterized in that, The determining module is specifically used for: The highest internal temperature of the battery cell was recorded during the charging process using multiple different test charging strategies. Based on the test charging strategy and the first internal maximum temperature, a correlation between the charging strategy and the internal maximum temperature is generated; The charging strategy corresponding to the target boundary temperature is determined based on the correlation relationship, and is used as the target charging strategy.

9. An electronic device, characterized in that, The electronic device includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the boundary temperature reliability verification method as described in any one of claims 1 to 6.

10. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the boundary temperature reliability verification method as described in any one of claims 1 to 6.

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