A battery charging strategy reliability testing method, device, terminal and storage medium

Abstract

The present invention discloses a battery charging strategy reliability test method, device, terminal and storage medium, which belongs to the field of new energy battery management technology, including: responding to the battery charging strategy initial reliability test instruction, obtaining initial test data to determine whether the design requirements are met; if so, responding to the battery charging strategy short-term reliability test instruction, obtaining short-term reliability test data to determine whether the design requirements are met; if so, responding to the battery charging strategy long-term reliability test instruction, obtaining long-term reliability test data to determine whether the design requirements are met. This patent sequentially tests the reliability of the battery strategy from the dimensions of negative electrode potential, temperature, expansion force, cycle life, etc., adjusts the design elements of the charging strategy based on the battery cell limit lithium-free charging database, and repeats the reliability test until the design requirements are met, so as to ensure the safety and life of the battery.

Description

Technical Field

[0001] The invention discloses a battery charging strategy reliability testing method, device, terminal and storage medium, belonging to the technical field of new energy battery management. Background Art

[0002] With the rapid development of new energy vehicles, users' complaints about long charging time are increasing. However, during fast charging, the battery's charging temperature rise and charging safety have become an unavoidable problem. Every year, there are reports of fire accidents in energy storage power stations and electric vehicles, but the cause of battery fires, failure mechanisms, and failure causes are still unclear. Because battery safety involves multi-dimensional factors such as force, electricity, heat, chemistry, and temperature fields, there is no systematic method to ensure battery safety and life under the premise of fast charging.

[0003] There are two methods for obtaining charging current. One is trial and error, and the other is a composite method of test and simulation to determine the lithium precipitation boundary. The trial and error method is generally based on the test data of battery charging current and negative electrode potential, and the limit charging current under the negative electrode potential threshold is extrapolated. This method requires the production of a large number of three-electrode batteries. The production of three batteries requires stability testing and durability testing, which takes a long time and it is difficult for three batteries to meet long-term testing requirements. Another method is a composite method of test and simulation, which is based on the calibration of the battery model based on the three-electrode test. Under the premise that the battery model is accurate, the charging current is changed in real time according to the negative electrode potential threshold requirements, which can effectively save test time and is supported by theory and control theory. Although the current method can obtain the shortest charging time, it often brings problems of insufficient cruising range and charging temperature exceeding the limit in actual use, that is, the actual problems of charging SOC not meeting the standard and battery temperature being too high, and no specific method is proposed for battery reliability verification. In general, the reliability evaluation method of charging strategy is currently in a state of absence. Summary of the invention

[0004] In view of the defects of the prior art, the present invention proposes a battery charging strategy reliability testing method, device, terminal and storage medium, and proposes a verification method for the reliability of the battery through dimensions such as negative electrode potential, temperature, expansion force, cycle life, etc.

[0005] The technical solution of the present invention is as follows:

[0006] According to a first aspect of an embodiment of the present invention, a battery charging strategy reliability testing method is provided, comprising:

[0007] In response to a battery charging strategy initial reliability test instruction, obtaining initial test data to determine whether the design requirements are met;

[0008] If so, in response to a battery charging strategy short-term reliability test instruction, obtaining short-term reliability test data to determine whether the design requirements are met;

[0009] If so, in response to the battery charging strategy long-term reliability test instruction, long-term reliability test data is obtained to determine whether the design requirements are met.

[0010] Preferably, the battery charging strategy initial reliability test instruction includes: charging the test battery under preset temperature conditions according to the charging strategy until it is fully charged.

[0011] Preferably, the battery charging strategy short-term reliability test instruction includes: charging the test battery under preset temperature conditions according to the charging strategy until it is fully charged, leaving the battery to stand for 2 hours to allow the temperature to return to the preset temperature, and then discharging it to 0% SOC at 1 / 3C with a battery preload of 3000N. The above process is one cycle, with 10-30 cycles.

[0012] Preferably, the process in the battery charging strategy long-term reliability test instruction is the same as the battery charging strategy short-term reliability test instruction, and the cycle is 2500 times. The battery charging strategy long-term reliability design requirements are the same as the battery charging strategy short-term reliability design requirements.

[0013] Preferably, the obtaining of initial test data to determine whether the design requirements are met includes:

[0014] Get the full charge time of the test battery and determine whether it is ≤ the charging target time:

[0015] Yes, proceed to the next step;

[0016] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met;

[0017] Obtain the maximum temperature of the battery cell during the charging process of the test battery and determine whether it is ≤ the battery cell operating temperature:

[0018] Yes, proceed to the next step;

[0019] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met;

[0020] Obtain the maximum cell Fuse temperature during the test battery charging process and determine whether it is ≤ the battery Fuse tolerance temperature:

[0021] Yes, proceed to the next step;

[0022] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met;

[0023] Obtain the lowest voltage value of the negative electrode potential charging process of the test battery and determine whether it is ≥ the standard voltage value:

[0024] Yes, proceed to the next step;

[0025] No, adjust the design elements of the charging strategy according to the battery cell limit lithium-free charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met.

[0026] Preferably, the obtaining of short-term reliability test data to determine whether the design requirements are met includes:

[0027] Obtain the expansion force of the test battery during charging and determine whether it is ≤ the standard clamping force:

[0028] Yes, proceed to the next step;

[0029] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0030] Obtain the cell size change rate during the test battery charging process and determine whether it is ≤ the standard cell size change rate:

[0031] Yes, proceed to the next step;

[0032] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0033] Obtain the capacity decay of the test battery during the charging process and determine whether it is ≤ standard capacity decay:

[0034] Yes, proceed to the next step;

[0035] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0036] Obtain the negative electrode plate image data of the test battery, obtain the electrode plate lithium deposition area ratio according to the negative electrode plate image data, and determine whether it is greater than or equal to the design requirement:

[0037] Yes, proceed to the next step;

[0038] No, adjust the design elements of the charging strategy according to the battery cell limit lithium-free charging database and repeatedly respond to the battery charging strategy short-term reliability test instructions until the requirements are met.

[0039] Preferably, the preset temperature includes: 25-45°C, and the design elements include at least: battery preload, module size, insulation pad design parameters and overall package design.

[0040] According to a second aspect of an embodiment of the present invention, there is provided a battery charging strategy reliability testing device, comprising:

[0041] An initial test module, used to respond to the battery charging strategy initial reliability test instruction, obtain initial test data to determine whether the design requirements are met;

[0042] A short-term test module is used to, in response to a battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether the design requirements are met;

[0043] The long-term testing module is used to, in response to the battery charging strategy long-term reliability testing instruction, obtain long-term reliability testing data to determine whether the design requirements are met.

[0044] According to a third aspect of an embodiment of the present invention, a terminal is provided, including:

[0045] one or more processors;

[0046] a memory for storing the one or more processor-executable instructions;

[0047] Wherein, the one or more processors are configured to:

[0048] Execute the method described in the first aspect of the embodiment of the present invention.

[0049] According to a fourth aspect of an embodiment of the present invention, a non-temporary computer-readable storage medium is provided. When instructions in the storage medium are executed by a processor of a terminal, the terminal is enabled to execute the method described in the first aspect of the embodiment of the present invention.

[0050] According to a fifth aspect of the embodiments of the present invention, an application product is provided. When the application product is running on a terminal, the terminal executes the method described in the first aspect of the embodiments of the present invention.

[0051] The beneficial effects of the present invention are:

[0052] This patent provides a battery charging strategy reliability test method, device, terminal and storage medium. It tests the reliability of the battery strategy from the dimensions of negative electrode potential, temperature, expansion force, cycle life, etc. through initial reliability test, short-term reliability test and long-term reliability test in sequence. It adjusts the design elements of the charging strategy based on the battery cell limit lithium-free charging database, and repeats the reliability test until the design requirements are met, so as to ensure the safety and life of the battery.

[0053] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a flow chart of a battery charging strategy reliability testing method according to an exemplary embodiment;

[0055] Figure 2 It is a schematic diagram of a response surface of the relationship between charge capacity, charging current and temperature in a battery cell limit non-lithium precipitation charging database according to a battery charging strategy reliability test method shown in an exemplary embodiment;

[0056] Figure 3 is a comparison curve diagram of new and old charging strategies according to a specific example of a battery charging strategy reliability test method shown in accordance with an exemplary embodiment;

[0057] Figure 4 is a schematic block diagram of a battery charging strategy reliability testing device according to an exemplary embodiment;

[0058] Figure 5 The present invention is a schematic block diagram of a terminal structure according to an exemplary embodiment. DETAILED DESCRIPTION

[0059] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0060] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0061] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] An embodiment of the present invention provides a battery charging strategy reliability test method, which is implemented by a terminal. The terminal may be a smart phone, a desktop computer, or a laptop computer, etc. The terminal at least includes a CPU, etc.

[0063] Embodiment 1

[0064] Figure 1 The present invention is a flow chart of a method for testing the reliability of a battery charging strategy according to an exemplary embodiment. The method is used in a terminal and includes the following steps:

[0065] Step 101, in response to the battery charging strategy initial reliability test instruction, obtain initial test data to determine whether it meets the design requirements, the specific content is as follows:

[0066] In response to the battery charging strategy initial reliability test instruction, the test battery is charged under the preset temperature conditions and the charging strategy is executed until it is fully charged. The initial test data is obtained to determine whether it meets the design requirements. The specific steps are as follows:

[0067] Get the full charge time of the test battery and determine whether it is ≤ the target charging time. The target charging time is selected based on experience:

[0068] Yes, proceed to the next step;

[0069] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instructions until the requirements are met;

[0070] Get the highest cell temperature during the test battery charging process and determine whether it is ≤ the cell operating temperature. The cell operating temperature is selected based on experience:

[0071] Yes, proceed to the next step;

[0072] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instructions until the requirements are met;

[0073] Get the maximum temperature of the battery cell fuse during the test battery charging process and determine whether it is ≤ the battery fuse tolerance temperature. The battery fuse tolerance temperature is selected based on experience:

[0074] Yes, proceed to the next step;

[0075] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instructions until the requirements are met;

[0076] Obtain the lowest voltage value of the negative electrode potential charging process of the test battery and determine whether it is ≥ the standard voltage value. The standard voltage value is selected based on experience:

[0077] Yes, proceed to the next step;

[0078] No, adjust the design elements of the charging strategy according to the cell limit lithium-free charging database and repeatedly respond to the battery charging strategy initial reliability test instructions until the requirements are met.

[0079] Step 102: If yes, in response to the battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether it meets the design requirements. The specific contents are as follows:

[0080] The battery charging strategy short-term reliability test instruction includes: charging the test battery under the preset temperature conditions and running the charging strategy until it is fully charged, leaving the battery for 2 hours to return to the preset temperature, and then discharging it to 0% SOC at 1 / 3C. The battery preload force is 3000N. The above process is one cycle, and the cycle is 10-30 times. Obtain short-term reliability test data to determine whether it meets the design requirements. The specific steps are as follows:

[0081] Obtain the expansion force of the test battery during charging and determine whether it is less than or equal to the standard clamping force, which is selected based on experience:

[0082] Yes, proceed to the next step;

[0083] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0084] Obtain the cell size change rate during the test battery charging process and determine whether it is ≤ the standard cell size change rate. The standard cell size change rate is selected based on experience:

[0085] Yes, proceed to the next step;

[0086] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0087] Obtain the capacity decay of the test battery during the charging process and determine whether it is less than or equal to the standard capacity decay, where the standard capacity decay is selected based on experience:

[0088] Yes, proceed to the next step;

[0089] No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met;

[0090] Obtain the negative electrode sheet image data of the test battery, obtain the electrode sheet lithium deposition area ratio according to the negative electrode sheet image data, and determine whether it is greater than or equal to the ratio design requirement, and the ratio design requirement is selected based on experience:

[0091] Yes, proceed to the next step;

[0092] No, adjust the design elements of the charging strategy according to the battery cell limit lithium-free charging database and repeatedly respond to the battery charging strategy short-term reliability test instructions until the requirements are met.

[0093] Step 103: If yes, in response to the battery charging strategy long-term reliability test instruction, obtain long-term reliability test data to determine whether the design requirements are met. The specific contents are as follows:

[0094] The process in the battery charging strategy long-term reliability test instruction is the same as the battery charging strategy short-term reliability test instruction, with 2500 cycles. The battery charging strategy long-term reliability design requirements are the same as the battery charging strategy short-term reliability design requirements.

[0095] The above preset temperature is: 25-45℃. During the test, the temperature values ​​can be selected for testing respectively, and the battery charging strategy corresponding to the corresponding temperature can be obtained. The above-mentioned battery cell limit non-lithium precipitation charging database is a method of simulation or actual measurement, with the priority condition of charging 0-100 charge capacity, and the charge capacity is divided into N intervals (N is a positive integer). Obtain each maximum charging current Ii that can fill each SOC interval and the negative electrode potential is greater than 0, and for the continuous charging process of I1, I2, ..., In, ensure that the maximum temperature is lower than the design requirements to obtain the relationship between charge capacity, charging current and temperature. The design elements of adjusting the charging strategy are based on the current charging strategy and the charge capacity, charging current and temperature relationship in the battery cell limit non-lithium precipitation charging database to seek the maximum charging current, and adjust the design elements according to time, expansion force, cycle life and other requirements. The design elements include at least: battery preload, module size, insulation pad design parameters and whole package design.

[0096] Specific examples are as follows:

[0097] A square battery has a charging upper and lower cut-off voltage of 2.8-4.3V and a battery capacity of 150Ah. A temperature sensor is implanted in the battery cell to record the battery fuse temperature. Now determine a reliable charging strategy for the battery under a 25℃ operating environment. First, charge the battery cell according to Table 1.

[0098] Table 1 25℃ charging strategy diagram

[0099]

[0100] The target charging time of this specific example is 80 minutes, and the full charging time of the test battery is 78 minutes, which is less than the target charging time of 80 minutes. The operating temperature of the battery cell of this specific example is 55°C, and the maximum temperature of the battery cell during the charging process of the test battery is 45°C, which is less than the operating temperature of the battery cell of 55°C. The battery Fuse tolerance temperature of this specific example is 65°C, and the maximum temperature of the battery cell Fuse during the charging process of the test battery is 58°C, which is less than the battery Fuse tolerance temperature. The standard voltage value of this specific example is 110mV, and the minimum voltage value of the negative electrode potential charging process of the test battery is higher than 110mV.

[0101] Then the short-term life test of the battery cell is carried out. This test can be carried out in the module or on the battery cell bench.

[0102] Short-term life test conditions: 25℃, charge for 20 cycles according to the established charging strategy, let stand for 2h in the middle until the battery temperature returns to 25℃, and then discharge to 0% charge capacity at 1 / 3C. The battery preload force is 3000N, and the expansion force changes during the intermediate detection process are all less than 3000N. During the test, the battery stress is monitored, and the long-term life test is continued. The test conditions are consistent with the short-term life, and the test cycle is 2500 cycles.

[0103] The standard clamping force of this specific example is 20000N, and the expansion force during the test battery charging process is 21000N, which exceeds the design requirement of 20000N. The standard battery cell size change rate of this specific example is 7%, and the battery cell size change rate during the test battery charging process is 8%, which is higher than the 7% indicator requirement of the battery design requirement. The standard capacity decay of this specific example is 80%, and the capacity decay of the test battery charging process is 70%, which is less than the battery design indicator requirement of 80%. The tested battery cell is disassembled to obtain the negative electrode plate image data of the test battery. The design requirement for the proportion of this specific example is 30%. The proportion of the electrode lithium plating area obtained based on the negative electrode plate image data is greater than the design requirement of 30%.

[0104] According to the principle of achieving comprehensive engineering indicators and maintaining platform module design as much as possible, we consider the solution of improving battery capacity, large surface expansion and expansion force indicators from the perspective of charging MAP update and module design (initial binding force of battery cells, change of module size, change of insulation pad parameter design). According to the battery cell limit non-lithium charging database, the charge capacity, charging current and temperature relationship response surface is drawn with the negative electrode potential threshold of 10mV. Figure 2 shown.

[0105] The relationship between the maximum charging current, voltage and SOC of the battery under 25℃ charging condition is shown in Table 2. In the area formed by the maximum charging current and the original charging strategy ( Figure 3 ) to seek new charging strategies, such as Figure 3 As shown, the new charging strategy is shown in Table 3. The SOC is charged according to Table 3 and the voltage of each SOC stop point is recorded.

[0106] Table 2 Relationship between the maximum charging current (XC) and voltage and temperature in each sub-SOC interval

[0107]

[0108] Table 3 New charging strategy diagram at 25℃

[0109]

[0110] The entire charging process took 80 minutes. The maximum temperature of the large surface during the entire charging process was 49°C, the maximum temperature of the fuse was 60°C, and the minimum negative electrode potential was 47mV. The expansion force changes in the short-term life test were all less than 3000N. The discharge capacity of the 2500-cycle test was 83% @ the initial discharge capacity, the final expansion force was 19500N, and the battery size change rate was 5%, meeting the design index requirements and no large-scale lithium deposition was found in the disassembly photos.

[0111] Embodiment 2

[0112] Figure 4 The present invention is a schematic block diagram of a battery charging strategy reliability test device according to an exemplary embodiment, comprising:

[0113] The initial test module 210 is used to respond to the battery charging strategy initial reliability test instruction and obtain initial test data to determine whether the design requirements are met;

[0114] The short-term test module 220 is used to, in response to the battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether the design requirements are met;

[0115] The long-term testing module 230 is used to, in response to the battery charging strategy long-term reliability testing instruction, obtain long-term reliability testing data to determine whether the design requirements are met.

[0116] This patent provides a battery charging strategy reliability test method, device, terminal and storage medium. It tests the reliability of the battery strategy from the dimensions of negative electrode potential, temperature, expansion force, cycle life, etc. through initial reliability test, short-term reliability test and long-term reliability test in sequence. It adjusts the design elements of the charging strategy based on the battery cell limit lithium-free charging database, and repeats the reliability test until the design requirements are met, so as to ensure the safety and life of the battery.

[0117] Embodiment 3

[0118] A schematic diagram of the structure of a terminal provided in an embodiment of the present application is as follows: Figure 5 As shown, the terminal includes a processor 301, a memory 302, an input device 303 and an output device 304; the number of processors 301 in the terminal can be one or more. Figure 5 A processor 301 is taken as an example; the processor 301, the memory 302, the input device 303 and the output device 304 in the terminal can be connected by a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0119] The memory 302 is a computer-readable storage medium that can be used to store software programs, computer executable programs, and modules. Figure 5 The processor 301 executes various functional applications and data processing of the terminal by running the software programs, instructions and modules stored in the memory 302, that is, implementing the above-mentioned battery charging strategy reliability test method.

[0120] The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 302 may further include a memory remotely arranged relative to the processor 301, and these remote memories may be connected to the device / terminal / server via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0121] The input device 303 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the device. The output device 304 may include a display device such as a display screen.

[0122] Embodiment 4

[0123] The embodiment of the present application further provides a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute a battery charging strategy reliability test method when executed by a computer processor, the method comprising:

[0124] Used to respond to the battery charging strategy initial reliability test instruction and obtain initial test data to determine whether the design requirements are met;

[0125] If so, in response to a battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether the design requirements are met;

[0126] If so, in response to the battery charging strategy long-term reliability test instruction, long-term reliability test data is obtained to determine whether the design requirements are met. Of course, the storage medium containing computer executable instructions provided in an embodiment of the present application, and its computer executable instructions are not limited to the method operations described above, and a battery charging strategy reliability test method provided in any embodiment of the present application can also be executed.

[0127] Through the above description of the implementation method, the technicians in the relevant field can clearly understand that the present application can be implemented with the help of software and necessary general hardware, and of course it 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 the present application can be essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0128] It is worth noting that in the embodiment of the above-mentioned data storage device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0129] Embodiment 5

[0130] The embodiment of the present application also provides an application product. When the application product is running on a terminal, the terminal executes a battery charging strategy reliability testing method described in the first aspect of the embodiment of the present invention.

[0131] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A battery charging strategy reliability testing method, characterized in that: include: In response to the battery charging strategy initial reliability test instruction, obtaining initial test data to determine whether the design requirements are met; If so, in response to a battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether the design requirements are met; If so, in response to a battery charging strategy long-term reliability test instruction, obtaining long-term reliability test data to determine whether the design requirements are met; The battery charging strategy initial reliability test instruction includes: charging the test battery under a preset temperature condition and running the charging strategy until it is fully charged; The battery charging strategy short-term reliability test instruction includes: charging the test battery under a preset temperature condition and running the charging strategy until it is fully charged, leaving the battery for 2 hours to return to the preset temperature, and then discharging it at 1 / 3C to 0% SOC, with a battery preload of 3000N. The above process is one cycle, and the cycle is 10-30 times; The process in the battery charging strategy long-term reliability test instruction is the same as the battery charging strategy short-term reliability test instruction, and the cycle is 2500 times. The battery charging strategy long-term reliability design requirements are the same as the battery charging strategy short-term reliability design requirements; The preset temperature includes: 25-45℃, and the design elements include at least: battery preload, module size, insulation pad design parameters and whole package design. The battery cell limit non-lithium deposition charging database is a simulation or actual measurement method that takes charging 0-100 charge capacity as the priority condition, divides the charge capacity into N intervals, and obtains each maximum charging current that can fill each SOC interval and the negative electrode potential is greater than 0. The continuous charging process of each maximum charging current ensures that the maximum temperature is lower than the design requirements to obtain the relationship between charge capacity, charging current and temperature. The relationship between charge capacity, charging current and temperature is obtained by ensuring that the maximum temperature is lower than the design requirements. The design elements of adjusting the charging strategy are based on the current charging strategy and the charge capacity, charging current and temperature relationship in the battery cell limit non-lithium deposition charging database to seek the maximum charging current, and adjust the design elements according to time, expansion force and cycle life requirements; The obtaining of initial test data to determine whether the design requirements are met includes: Get the full charge time of the test battery and determine whether it is ≤ the target charging time: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the maximum temperature of the battery cell during the charging process of the test battery and determine whether it is ≤ the battery cell operating temperature: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the maximum cell Fuse temperature during the test battery charging process and determine whether it is ≤ the battery Fuse tolerance temperature: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the lowest voltage value of the negative electrode potential charging process of the test battery and determine whether it is ≥ the standard voltage value: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; The obtaining of short-term reliability test data to determine whether the design requirements are met includes: Obtain the expansion force of the test battery during charging and determine whether it is ≤ the standard clamping force: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the cell size change rate during the test battery charging process and determine whether it is ≤ the standard cell size change rate: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the capacity decay of the test battery during the charging process and determine whether it is ≤ standard capacity decay: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the negative electrode plate image data of the test battery, obtain the electrode plate lithium deposition area ratio according to the negative electrode plate image data, and determine whether it is greater than or equal to the design requirement: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit lithium-free charging database and repeatedly respond to the battery charging strategy short-term reliability test instructions until the requirements are met.

2. A battery charging strategy reliability test device, characterized in that: include: An initial test module, used to respond to the battery charging strategy initial reliability test instruction, obtain initial test data to determine whether the design requirements are met; A short-term test module is used to, in response to a battery charging strategy short-term reliability test instruction, obtain short-term reliability test data to determine whether the design requirements are met; A long-term testing module is used to, in response to a battery charging strategy long-term reliability testing instruction, obtain long-term reliability testing data to determine whether the design requirements are met; The battery charging strategy initial reliability test instruction includes: charging the test battery under a preset temperature condition and running the charging strategy until it is fully charged; The battery charging strategy short-term reliability test instruction includes: charging the test battery under a preset temperature condition and running the charging strategy until it is fully charged, leaving the battery for 2 hours to return to the preset temperature, and then discharging it at 1 / 3C to 0% SOC, with a battery preload of 3000N. The above process is one cycle, and the cycle is 10-30 times; The process in the battery charging strategy long-term reliability test instruction is the same as the battery charging strategy short-term reliability test instruction, and the cycle is 2500 times. The battery charging strategy long-term reliability design requirements are the same as the battery charging strategy short-term reliability design requirements; The preset temperature includes: 25-45℃, and the design elements include at least: battery preload, module size, insulation pad design parameters and whole package design. The battery cell limit non-lithium deposition charging database is a simulation or actual measurement method that takes charging 0-100 charge capacity as the priority condition, divides the charge capacity into N intervals, and obtains each maximum charging current that can fill each SOC interval and the negative electrode potential is greater than 0. The continuous charging process of each maximum charging current ensures that the maximum temperature is lower than the design requirements to obtain the relationship between charge capacity, charging current and temperature. The relationship between charge capacity, charging current and temperature is obtained by ensuring that the maximum temperature is lower than the design requirements. The design elements of adjusting the charging strategy are based on the current charging strategy and the charge capacity, charging current and temperature relationship in the battery cell limit non-lithium deposition charging database to seek the maximum charging current, and adjust the design elements according to time, expansion force and cycle life requirements; The obtaining of initial test data to determine whether the design requirements are met includes: Get the full charge time of the test battery and determine whether it is ≤ the target charging time: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the maximum temperature of the battery cell during the charging process of the test battery and determine whether it is ≤ the battery cell operating temperature: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the maximum cell Fuse temperature during the test battery charging process and determine whether it is ≤ the battery Fuse tolerance temperature: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; Obtain the lowest voltage value of the negative electrode potential charging process of the test battery and determine whether it is ≥ the standard voltage value: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy initial reliability test instruction until the requirements are met; The obtaining of short-term reliability test data to determine whether the design requirements are met includes: Obtain the expansion force of the test battery during charging and determine whether it is ≤ the standard clamping force: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the cell size change rate during the test battery charging process and determine whether it is ≤ the standard cell size change rate: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the capacity decay of the test battery during the charging process and determine whether it is ≤ standard capacity decay: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit non-lithium plating charging database and repeatedly respond to the battery charging strategy short-term reliability test instruction until the requirements are met; Obtain the negative electrode plate image data of the test battery, obtain the electrode plate lithium deposition area ratio according to the negative electrode plate image data, and determine whether it is greater than or equal to the design requirement: Yes, proceed to the next step; No, adjust the design elements of the charging strategy according to the battery cell limit lithium-free charging database and repeatedly respond to the battery charging strategy short-term reliability test instructions until the requirements are met.

3. A terminal, characterized in that: include: one or more processors; a memory for storing said one or more processor executable instructions; Wherein, the one or more processors are configured to: Execute the battery charging strategy reliability testing method as described in claim 1.

4. A non-transitory computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by the processor of the terminal, the terminal is enabled to execute the battery charging strategy reliability testing method as claimed in claim 1.

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