A battery testing method, testing device and readable storage medium

Abstract

The application discloses a battery test method, a test device and a readable storage medium, and establishes a probability relation table between a lithium precipitation area and a cycle diving interval of a battery capacity in advance, determines the corresponding cycle diving interval and the interval probability of the battery after the charge-discharge test of the set cycle number, solves the technical problem that the cycle diving interval test period of the battery is long in the prior art, the service life of the battery cannot be accurately determined, and the customer experience is affected and the after-sales cost is increased, realizes the technical effect that the test duration is effectively shortened under the condition of ensuring the test accuracy, improves the accuracy of the battery service life determination, improves the customer experience, and reduces the after-sales cost.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery testing method, testing equipment, and readable storage medium. Background Technology

[0002] During cycling, the battery capacity gradually decreases due to the loss of active materials and lithium plating at the interface. During use, various factors such as battery manufacturing process and user operating conditions may cause the battery to experience a rapid decline in SOH (State of Health) at different stages.

[0003] Current methods for detecting lithium plating in battery cells, such as superposition capacity analysis, electrolyte consumption rate monitoring, and differential curve peak area analysis, all require real-time monitoring of battery cycling. These methods can only provide early warnings based on data after lithium plating has occurred, resulting in long testing cycles and an inability to accurately predict the battery's cycle performance limits in advance. In contrast, factories conduct ORT (Ongoing Reliability Test) tests on each batch of mass-produced battery cells before delivery to customers to confirm the cycle performance of that batch.

[0004] However, the cycle testing period is long. For example, it takes 3 to 4 years for a 0.5P battery to reach 80% SOH after 6000 cycles. If the cycle drop range of the battery cannot be predicted in advance, and the battery fails to meet the specifications after being delivered to the customer, it will cause quality complaints and increase after-sales costs. Summary of the Invention

[0005] This invention provides a battery testing method, testing equipment, and readable storage medium, solving the technical problem in the prior art where the battery cycle test period is too long, making it impossible to accurately determine the battery's lifespan, thus affecting customer experience and increasing after-sales costs.

[0006] This invention provides a battery testing method, the testing method comprising:

[0007] The battery under test is pre-processed for charging and discharging based on its rated charge / discharge rate and rated charge / discharge voltage.

[0008] The battery under test, after charge-discharge pretreatment at a set temperature, is subjected to a static treatment for a first set time.

[0009] The battery under test after being left to stand is subjected to a set charge-discharge cycle test at a set charge-discharge rate for a set number of cycles, and then subjected to a second set set time of standing treatment. The set charge rate is determined based on the end-of-life capacity of the battery under test, and the set discharge rate is determined based on the temperature maintenance state of the battery under test during the cycle charge-discharge process. The set number of cycles is one of the following: 50 times or 100 times.

[0010] The battery under test, after completing the charge-discharge cycle test, is charged again to the rated voltage at the set charging rate, and then subjected to a resting treatment for a third set duration.

[0011] The battery under test was disassembled after being left to stand, and the lithium plating area of ​​the battery under test was determined.

[0012] Based on the lithium plating area, a probability relationship table between the preset lithium plating area and the cycle drop interval of the battery capacity is queried to determine the cycle drop interval of the battery capacity under test and the probability of the interval.

[0013] The lifespan of the battery under test is determined based on the identified cyclic drop intervals and the probability of each interval.

[0014] Furthermore, the method for determining the probability relationship table between the preset lithium plating area and the cycle drop range of battery capacity includes:

[0015] Set up multiple sets of test batteries;

[0016] Each group of test batteries is pre-treated for charging and discharging based on the rated charge-discharge rate and rated charge-discharge voltage of the test batteries.

[0017] Each group of test batteries, after charge-discharge pretreatment, is subjected to a first set time of static treatment at a set temperature.

[0018] After static treatment, each group of test batteries is subjected to charge-discharge cycle tests at a set charge-discharge rate for a set number of cycles to form a test control group, and is subjected to static treatment for a second set duration accordingly. The set charge rate is determined based on the end-of-life capacity of the test battery, the set discharge rate is determined based on the temperature maintenance state of the test battery during the cyclic charge-discharge process, and the set number of cycles includes at least 50 and 100 cycles.

[0019] Each group of test batteries that has completed the charge-discharge cycle test is charged again to the rated voltage at the set charging rate, and then subjected to a third set period of resting treatment.

[0020] The test batteries in each group that have been left to stand are disassembled to determine the lithium plating area of ​​the test batteries;

[0021] Based on disassembly experience with lithium plating area and corresponding battery capacity at different set cycle numbers, the probabilistic relationship between the cycle drop range of lithium plating area and battery capacity is determined, and a table is generated.

[0022] Furthermore, the pre-processing of the battery under test based on its rated charge / discharge rate and rated charge / discharge voltage includes:

[0023] The battery under test is left to stand at the first temperature for a fourth set time.

[0024] The battery under test is charged to the rated charging voltage using the rated charging rate at constant power, and then left to stand for a fifth set time.

[0025] The battery under test is discharged to the rated discharge voltage using the rated discharge rate at a constant power, and then left to stand for a sixth set time.

[0026] Repeat the above process of charging at the rated charging rate and discharging at the rated discharging rate at least twice to complete the charge and discharge pretreatment of the battery under test.

[0027] Furthermore, the test battery, after being left to stand, undergoes a set charge-discharge cycle test at a set charge-discharge rate for a set number of cycles, and a corresponding second set duration of standing time is performed, including:

[0028] The battery under test is charged to its rated charging voltage at a constant power using a set charging rate, and then left to stand for a second set time.

[0029] The battery under test is discharged to its rated discharge voltage at a constant power using a set discharge rate, and then left to stand for a second set time.

[0030] Based on the set number of cycles, the process of charging at the set charging rate and discharging at the set discharging rate is repeated to complete the charge-discharge cycle test of the battery under test.

[0031] Furthermore, the set charging rate is 1.67 times the rated charging rate; the set discharging rate is 0.1 times the rated discharging rate.

[0032] Further, determining the lithium plating area of ​​the test battery includes:

[0033] The lithium plating area of ​​the test cells was divided into three levels:

[0034] Grade 1: No lithium plating, no wrinkles;

[0035] Level 2: Lithium plating area on one side ≤ 10% or lithium plating area on the entire surface of a single core ≤ 1%;

[0036] Level 3: Lithium plating area on one side > 10% or lithium plating area on the entire surface of a single core package > 1%.

[0037] Furthermore, the set temperature is 25°C, the first set duration is 5 hours, the second set duration is 30 minutes, and the third set duration is 30 minutes.

[0038] Furthermore, the first temperature is 25°C, the fourth set duration is 5 hours, the fifth set duration is 10 minutes, and the sixth set duration is 10 minutes.

[0039] This invention also provides a battery testing device, the battery testing device comprising:

[0040] At least one processor; and

[0041] A memory communicatively connected to the at least one processor; wherein,

[0042] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the battery testing method described in any of the above embodiments.

[0043] This invention also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the battery testing method described in any of the above embodiments.

[0044] This invention discloses a battery testing method, testing equipment, and a readable storage medium. The testing method includes: performing charge / discharge pretreatment on the battery under test based on its rated charge / discharge rate and rated charge / discharge voltage; subjecting the pretreated battery to a first set time of resting at a set temperature; performing a set number of charge / discharge cycle tests on the rested battery at a set charge / discharge rate, and then performing a second set time of resting accordingly; charging the battery to its rated voltage again at a set charge rate after completing the charge / discharge cycle tests, and then performing a third set time of resting; disassembling the rested battery to determine its lithium plating area; querying a pre-defined probability relationship table between the lithium plating area and the battery capacity's cycle drop interval based on the lithium plating area to determine the cycle drop interval and probability of the battery capacity; and determining the battery's lifespan based on the determined cycle drop interval and probability. This invention uses a pre-established probability relationship table to determine the corresponding cycle failure range and its probability by looking up the lithium plating area after a set number of charge-discharge cycles. In the prior art, the test cycle for the cycle failure range of the battery is too long, which cannot accurately determine the battery's lifespan, thus affecting the customer's user experience and increasing after-sales costs. This invention achieves the technical effect of effectively shortening the test time while ensuring test accuracy, improving the accuracy of battery lifespan determination, enhancing the customer's user experience, and reducing after-sales costs. Attached Figure Description

[0045] Figure 1 This is a flowchart of a battery testing method provided in an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of a battery testing device provided in an embodiment of the present invention. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0049] For freshly produced batteries that have come off the production line in normal condition, with the steel clamps installed in their initial state, in one scenario, short-term charge-discharge cycles can be performed in a constant temperature chamber based on the charge-discharge rate used by the user, thus achieving the testing of long-cycle batteries in a short time. In another scenario, if the user has not defined the charge-discharge rate, the following test process can be performed by using a custom gradient charge-discharge rate, thereby achieving the purpose of verifying the appropriate charge-discharge rate of the battery.

[0050] Figure 1 This is a flowchart of a battery testing method provided in an embodiment of the present invention.

[0051] like Figure 1 As shown, the specific testing method for this battery includes the following steps:

[0052] S101, pre-processes the battery under test for charging and discharging based on the rated charge / discharge rate and rated charge / discharge voltage.

[0053] Specifically, the battery under test first needs to undergo charge-discharge pretreatment, namely, an initial charge-discharge performance test. The initial charge-discharge performance test is a performance test as specified in the national standard GB / T 36276-2023, used to determine whether the battery capacity meets the manufacturer's claimed rated capacity.

[0054] Optionally, S101 specifically includes:

[0055] The battery under test is left to stand at the first temperature for a fourth set time; the battery under test is charged to the rated charging voltage at a constant power using the rated charging rate, and left to stand for a fifth set time; the battery under test is discharged to the rated discharge voltage at a constant power using the rated discharge rate, and left to stand for a sixth set time; the above process of charging at the rated charging rate and discharging at the rated discharge rate is repeated at least twice to complete the charge and discharge pretreatment of the battery under test.

[0056] Specifically, the first temperature can be selected between 23℃ and 27℃. Assuming the rated charging voltage is 3.65V and the rated discharging voltage is 2.5V, in this embodiment of the invention, the first temperature is preferably 25℃. The fourth set duration is preferably 5 hours, the fifth set duration is preferably 10 minutes, and the sixth set duration is preferably 10 minutes.

[0057] The charge / discharge pretreatment is as follows: a) Place the battery under test at 25°C for 5 hours, which completes the process of placing the battery under test at the first temperature for the fourth set time; b) Charge the battery under test to 3.65V at a constant power using the rated charging rate Prc, and place it for 10 minutes, which completes the process of placing it for the fifth set time; c) Discharge the battery under test to 2.5V at a constant power using the rated discharging rate Prd, and place it for 10 minutes, which completes the process of placing it for the sixth set time; d) Repeat steps b) to c) at least twice to complete the charge / discharge pretreatment of the battery under test.

[0058] S102, the battery under test after charge and discharge pretreatment is subjected to a first set time of static treatment at a set temperature.

[0059] In this embodiment of the invention, the first set time is preferably 5 hours and the set temperature is 25°C. After the charge and discharge pretreatment, the battery to be tested is left to stand at 25°C for 5 hours, which completes the above-mentioned process of standing for the first set time.

[0060] S103, the battery under test after static treatment is subjected to a set charge-discharge cycle test with a set charge-discharge rate for a set number of cycles, and a static treatment for a second set duration is performed accordingly. The set charge rate is determined based on the end-of-life capacity of the battery under test, and the set discharge rate is determined based on the temperature maintenance state of the battery under test during the cyclic charge-discharge process. The set number of cycles is one of the following: 50 times or 100 times.

[0061] Optionally, the charging rate is set to 1.67 times the rated charging rate; the discharging rate is set to 0.1 times the rated discharging rate. The second set duration is preferably 30 minutes.

[0062] Specifically, the charging rate can be determined based on the end-of-life capacity of the battery under test, that is, the charging rate when the battery is used from the initial life (BOL) at the rated rate of Prc / Prd to the corresponding state of equilibrium (SOH), such as 60% SOH. For example, if the battery's capacity is considered to be at the end of its life when it reaches 60% of its total capacity, then the charging rate is set to 60% of the rated charging rate, i.e., 1 / 0.6 * Prc = 1.67 Prc. The end-of-life capacity can also be set to 60%, 70%, etc., as needed, without specific limitations here.

[0063] The selection of the discharge rate needs to ensure that the charging start temperature of the battery can be consistent with the ambient temperature during the cyclic charging and discharging steps. This is because if the charging rate in step g) is too high, it will lead to excessive temperature rise. When charging in step f) after resting for 30 minutes, the battery surface temperature will be too high, which will slow down the lithium plating process and cannot accurately help predict the lithium plating level of the cell. Therefore, in this embodiment of the invention, the discharge rate is set to 0.1Prd.

[0064] For example, due to the degradation of the total battery capacity, the rated rate will increase by a corresponding factor compared to the end of the battery's lifespan. For instance, a 280Ah battery initially uses a charge / discharge rate of Prc = Prd = 280 * 3.2 * 0.5 = 448W (rated rate defined as 0.5P). When the battery cycles to 60% SOH, the total battery capacity degradation is 280 * 0.6 = 168Ah. At this point, the corresponding 0.5P rated rate is Prc = Prd = 168 * 3.2 * 0.5 = 268.8W. However, if the power consumption remains constant at the initial 448W during battery use, the initial rate is equivalent to 448W ÷ 268.8W = 1.67 times the end-of-life rate.

[0065] Optionally, S103 specifically includes:

[0066] The battery under test is charged to its rated charging voltage using a set charging rate at constant power and left to stand for a second set time. The battery under test is then discharged to its rated discharge voltage using a set discharging rate at constant power and left to stand for a second set time. The charging and discharging cycles of the battery under test are repeated using the set charging rate and the discharging rate based on a set number of cycles to complete the charge-discharge cycle test of the battery under test.

[0067] Specifically, after the first set time of resting is completed, the charge-discharge cycle test includes: f) charging the battery under test to 3.65V at a constant power using 1.67Prc and letting it rest for 30 minutes, which completes the above-mentioned second set time of resting; g) discharging the battery under test to 2.5V at a constant power using 0.1Prd and letting it rest for 30 minutes, which is the second set time of resting again; h) repeating f) to g) 50 or 100 times to complete the charge-discharge cycle test of the battery under test.

[0068] It should be noted that the number of cycles can be set to other values ​​as needed, such as 70, 150, 180, etc. The higher the number of cycles, the higher the test accuracy. It is preferable to use 100 cycles, which ensures accuracy while having a better test duration.

[0069] S104, the battery under test that has completed the charge-discharge cycle test is charged again to the rated voltage at the set charging rate, and then subjected to a set resting period for a third time.

[0070] Specifically, the third set duration is preferably 30 minutes. After completing the charge-discharge cycle test of the battery under test, the battery under test is charged again at a constant power of 1.67Prc to 3.65V and left to stand for 30 minutes, thus completing the above-mentioned process of standing for the third set duration.

[0071] S105, disassemble the battery under test after it has been left to stand, and determine the lithium plating area of ​​the battery under test.

[0072] Specifically, after the third set time of resting is completed, the battery under test is disassembled to determine the lithium plating status of the negative electrode and obtain the lithium plating area.

[0073] S106, based on the lithium plating area, query the probability relationship table between the preset lithium plating area and the cycle drop interval of the battery capacity, and determine the cycle drop interval of the battery capacity under test and the probability of the interval.

[0074] Specifically, cycle degradation refers to the phenomenon where the battery's cycle capacity retention rate suddenly accelerates from a linear decline. By querying a preset probability relationship table based on lithium plating area, the cycle degradation range and probability of the tested battery's capacity can be determined. This allows for the prediction of the cycle degradation range (6000 to 10000 cycles) for long-cycle batteries within one month using a limited number of charge-discharge cycles (e.g., 100 cycles) and the degree of lithium plating at the interface.

[0075] The probability relationship tables for 50 charge-discharge cycles and 100 charge-discharge cycles differ slightly, as shown in Tables 1 and 2. Clearly, the probability relationship table for 100 charge-discharge cycles provides higher accuracy. In Tables 1 and 2, ★ indicates the probability of the battery experiencing a significant drop in power consumption within the corresponding SOH range under the current lithium plating conditions at the negative electrode interface; the more ★ present, the greater the probability of a significant drop in power consumption.

[0076] Table 1. Probability of cycle failure after 100 cycles based on lithium plating grade and different SOH levels.

[0077] BOL ~ 90% SOH none none ★ 90% SOH ~ 80% SOH none ★ ★★ 80% SOH ~ 70% SOH ★ ★★ ★★★ 70% SOH~60% SOH ★★ ★★★ ★★★★

[0078] Table 2. Probability of cycle failure after 50 cycles based on lithium plating grade and different SOH levels.

[0079] BOL ~ 90% SOH none ★ ★★ 90% SOH ~ 80% SOH ★ ★★ ★★★ 80% SOH ~ 70% SOH ★★ ★★★ ★★★★ 70% SOH~60% SOH ★★★ ★★★★ ★★★★★

[0080] S107, determine the lifespan of the battery under test based on the determined cyclic drop interval and the probability of the interval.

[0081] Specifically, after determining the cycle drop range and the probability of being in that range, the battery's cycle life can be quickly predicted and the user's warranty status can be assessed, thus improving the user experience.

[0082] In this embodiment of the invention, by pre-establishing a probability relationship table between the lithium plating area and the cyclic degradation range of the battery capacity, the corresponding cyclic degradation range and its probability are determined by looking up the lithium plating area of ​​the battery after a set number of charge-discharge cycles. This solves the technical problem in the prior art where the test cycle degradation range of the battery is too long, making it impossible to accurately determine the battery's lifespan, thus affecting the customer's user experience and increasing after-sales costs. This invention achieves the technical effect of effectively shortening the test time while ensuring test accuracy, improving the accuracy of battery lifespan determination, enhancing the customer's user experience, and reducing after-sales costs.

[0083] Optionally, the method for determining the probability relationship table between the preset lithium plating area and the cycle drop range of battery capacity includes:

[0084] S1, set up multiple sets of test batteries.

[0085] Specifically, at least 6 PCS (Power Conversion System) batteries are selected and divided into two or more groups for testing, with each group having a different number of cycles, forming a control group.

[0086] S2, pre-processing of each group of test batteries based on the rated charge / discharge rate and rated charge / discharge voltage of the test batteries.

[0087] Specifically, the charge-discharge pretreatment is as follows: 1) Place each group of test batteries at the first temperature of 25°C for a fourth set time of 5 hours; 2) Charge each group of test batteries to 3.65V at a constant power using the rated charging rate Prc, and place them for a fifth set time of 10 minutes; 3) Discharge each group of test batteries to 2.5V at a constant power using the rated discharging rate Prd, and place them for a sixth set time of 10 minutes; 4) Repeat steps 2) to 3) at least twice to complete the charge-discharge pretreatment of each group of test batteries.

[0088] S3, at a set temperature, each group of test batteries after charge-discharge pretreatment is subjected to a set set time of static treatment.

[0089] Specifically, after the charge and discharge pretreatment, each group of test batteries was left to stand at 25°C for a first set time of 5 hours.

[0090] S4. After the static treatment, each group of test batteries is subjected to a set charge-discharge cycle test with a set charge-discharge rate for a set number of cycles to form a test control group, and a static treatment for a second set time is performed accordingly. The set charge rate is determined based on the end-of-life capacity of the test battery, the set discharge rate is determined based on the temperature maintenance state of the test battery during the cycle charge-discharge process, and the set number of cycles includes at least 50 and 100 times.

[0091] Specifically, after the first set time of resting is completed, the charge-discharge cycle test includes: 5) charging each group of test batteries to 3.65V at constant power using 1.67Prc and resting for a second set time of 30min; 6) discharging each group of test batteries to 2.5V at constant power using 0.1Prd and resting for another second set time of 30min; 7) setting some groups of test batteries to cycle 5) to 6) 50 times, and setting other groups of test batteries to cycle 5) to 6) 100 times, to complete the charge-discharge cycle test of the test batteries with a control group.

[0092] S5, after completing the charge-discharge cycle test, each group of test batteries is charged again to the rated voltage at the set charging rate, and then subjected to a set resting period for a third time.

[0093] Specifically, after completing the charge-discharge cycle test of each group of test batteries, each group of test batteries was charged again at a constant power of 1.67Prc to 3.65V and then left to stand for a third set time of 30 minutes.

[0094] S6. Disassemble each group of test batteries after they have been left to stand to determine the lithium plating area of ​​the test batteries.

[0095] Specifically, after cycling through 100Ah, 280Ah, and 314Ah batches according to steps S1 to S5 to the disassembly interfaces of 90% SOH, 80% SOH, 70% SOH, and 60% SOH respectively, the experience of the corresponding cycling curve drop for the lithium plating levels shown in Tables 1 and 2 above was summarized.

[0096] Optionally, S6, determining the lithium plating area of ​​the test battery includes: dividing the lithium plating area of ​​the test battery into three levels: Level 1: no lithium plating, no wrinkles; Level 2: single-sided lithium plating area ≤10% or single-cell whole-surface lithium plating area ≤1%; Level 3: single-sided lithium plating area >10% or single-cell whole-surface lithium plating area >1%.

[0097] Specifically, after the third set time of resting is completed, each group of test batteries is disassembled to determine the lithium plating status of the negative electrode, obtain the lithium plating area, and classify the lithium plating area into grades. It should be noted that if parallel samples or the front and back sides of a single cell pack have different lithium plating grades after the same number of cycles, the sample with more severe lithium plating shall be used for judgment; for wound structure batteries, the electrode between two consecutive R-angle midlines is recorded as 1 (single) side for single-sided electrodes, and a single electrode sheet in a stacked structure is recorded as 1 (single) side.

[0098] S7. Based on the disassembly experience of lithium plating area and corresponding battery capacity for different set cycle numbers, determine the probabilistic relationship between the cycle drop range of lithium plating area and battery capacity, and generate a table.

[0099] Specifically, after obtaining the lithium plating area of ​​the test batteries with different set cycle numbers, the cycle failure range and probability of the batteries are evaluated based on the disassembly experience of a large amount of SOH in the long cycle system cells, and the above Tables 1 and 2 are obtained for use.

[0100] In this embodiment of the invention, the lithium plating area of ​​a single electrode and a single cell after different charge-discharge cycles was quantified, and lithium plating levels one, two, and three were defined according to the severity of lithium plating. Based on the lithium plating area of ​​power storage products and the experience of disassembling cells with low state of health (SOH) during cycles, a relationship was established between the lithium plating level and the probability of battery degradation in different SOH ranges. This allows for rapid prediction of battery cycle life, assessment of customer warranty status, and reduction of after-sales warranty issues.

[0101] Figure 2 This is a schematic diagram of a battery testing device provided in an embodiment of the present invention. The battery testing device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The battery testing device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0102] like Figure 2 As shown, the battery testing device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the battery testing device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0103] Multiple components in the battery testing device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless transceiver, etc. The communication unit 19 allows the battery testing device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0104] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as a battery testing method.

[0105] In some embodiments, the battery testing method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the battery testing device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the battery testing method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the battery testing method by any other suitable means (e.g., by means of firmware).

[0106] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0107] Computer programs used to implement the battery testing methods of this invention can be written in any combination of one or more programming languages. These computer programs can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are performed. The computer programs can be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0108] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0109] To provide user interaction, the systems and techniques described herein can be implemented on battery testing equipment, which includes: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the battery testing equipment. Other types of devices can also be used to provide user interaction; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0110] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0111] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0112] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is made herein.

[0113] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for testing a battery, characterized in that, The testing method includes: The battery under test is pre-processed for charging and discharging based on its rated charge / discharge rate and rated charge / discharge voltage. The battery under test, after charge-discharge pretreatment at a set temperature, is subjected to a static treatment for a first set time. The battery under test after being left to stand is subjected to a set charge-discharge cycle test at a set charge-discharge rate for a set number of cycles, and then subjected to a second set set time of standing treatment. The set charge rate is determined based on the end-of-life capacity of the battery under test, and the set discharge rate is determined based on the temperature maintenance state of the battery under test during the cycle charge-discharge process. The set number of cycles is one of the following: 50 times or 100 times. The battery under test, after completing the charge-discharge cycle test, is charged again to the rated voltage at the set charging rate, and then subjected to a resting treatment for a third set duration. The battery under test was disassembled after being left to stand, and the lithium plating area of ​​the battery under test was determined. Based on the lithium plating area, a probability relationship table between the preset lithium plating area and the cycle drop interval of the battery capacity is queried to determine the cycle drop interval of the battery capacity under test and the probability of the interval. The lifespan of the battery under test is determined based on the identified cyclic drop intervals and the probability of each interval.

2. The battery testing method according to claim 1, characterized in that, The method for determining the probability relationship table between the preset lithium plating area and the cycle drop range of the battery capacity includes: Set up multiple sets of test batteries; Each group of test batteries is pre-treated for charging and discharging based on the rated charge-discharge rate and rated charge-discharge voltage of the test batteries. Each group of test batteries after charge-discharge pretreatment was subjected to a first set time of static treatment at a set temperature. After static treatment, each group of test batteries is subjected to charge-discharge cycle tests at a set charge-discharge rate for a set number of cycles to form a test control group, and is subjected to static treatment for a second set duration accordingly. The set charge rate is determined based on the end-of-life capacity of the test battery, the set discharge rate is determined based on the temperature maintenance state of the test battery during the cyclic charge-discharge process, and the set number of cycles includes at least 50 and 100 cycles. Each group of test batteries that has completed the charge-discharge cycle test is charged again to the rated voltage at the set charging rate, and then subjected to a third set period of resting treatment. The test batteries in each group that have been left to stand are disassembled to determine the lithium plating area of ​​the test batteries; Based on disassembly experience with lithium plating area and corresponding battery capacity at different set cycle numbers, the probabilistic relationship between the cycle drop range of lithium plating area and battery capacity is determined, and a table is generated.

3. The battery testing method according to claim 1, characterized in that, The pre-processing of the battery under test based on its rated charge / discharge rate and rated charge / discharge voltage includes: The battery under test is left to stand at the first temperature for a fourth set time. The battery under test is charged to the rated charging voltage using the rated charging rate at constant power, and then left to stand for a fifth set time. The battery under test is discharged to the rated discharge voltage using the rated discharge rate at a constant power, and then left to stand for a sixth set time. Repeat the above process of charging at the rated charging rate and discharging at the rated discharging rate at least twice to complete the charge and discharge pretreatment of the battery under test.

4. The battery testing method according to claim 1, characterized in that, The test battery, after being left to stand, undergoes a set charge-discharge cycle test at a set charge-discharge rate for a set number of cycles, and a corresponding second set duration of standing time is performed, including: The battery under test is charged to its rated charging voltage at a constant power using a set charging rate, and then left to stand for a second set time. The battery under test is discharged to its rated discharge voltage at a constant power using a set discharge rate, and then left to stand for a second set time. Based on the set number of cycles, the process of charging at the set charging rate and discharging at the set discharging rate is repeated to complete the charge-discharge cycle test of the battery under test.

5. The battery testing method according to claim 4, characterized in that, The set charging rate is 1.67 times the rated charging rate; the set discharging rate is 0.1 times the rated discharging rate.

6. The battery testing method according to claim 2, characterized in that, Determining the lithium plating area of ​​the test battery includes: The lithium plating area of ​​the test cells was divided into three levels: Grade 1: No lithium plating, no wrinkles; Level 2: Lithium plating area on one side ≤ 10% or lithium plating area on the entire surface of a single core ≤ 1%; Level 3: Lithium plating area on one side > 10% or lithium plating area on the entire surface of a single core package > 1%.

7. The test method for the battery according to any one of claims 1 or 2, characterized in that, The set temperature is 25°C, the first set duration is 5 hours, the second set duration is 30 minutes, and the third set duration is 30 minutes.

8. The battery testing method according to claim 3, characterized in that, The first temperature is 25°C, the fourth set duration is 5 hours, the fifth set duration is 10 minutes, and the sixth set duration is 10 minutes.

9. A battery testing device, characterized in that, The battery testing equipment includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the test method for the battery according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the test method for the battery according to any one of claims 1-8.

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