Battery test method, test equipment and readable storage medium

Abstract

The invention discloses a battery test method, a test device and a readable storage medium, and the method comprises the steps: pre-establishing a probability relation table between a lithium precipitation area and a cycle diving interval of a battery capacity, and determining a corresponding cycle diving interval and the probability of the interval through the lithium precipitation area look-up table of the battery after a charge and discharge test of a set cycle number; the technical problems that in the prior art, the cycle diving interval testing period of the battery is long, the service life of the battery cannot be accurately determined, the use experience of a client is affected, and the after-sales cost is increased are solved, the technical effect that the testing time is effectively shortened under the condition that the testing accuracy is guaranteed is achieved, and the testing efficiency is improved. The accuracy of determining the service life of the battery is improved, the use experience of customers is improved, and the after-sales cost is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of battery technology, and in particular to a battery testing method, testing equipment, and readable storage medium. Background Art

[0002] During the battery cycle, the battery capacity will gradually decay due to the loss of active materials and lithium deposition on the interface. During use, the battery may experience a cycle dive at different SOH (State of Health) levels due to various factors such as battery manufacturing process and client usage conditions.

[0003] Current methods for detecting lithium deposition 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 cycles. These methods can only provide early warnings based on data after lithium deposition occurs. These long testing cycles make it impossible to accurately predict the battery's cycle performance drop. Each batch of mass-produced cells is subjected to an Ongoing Reliability Test (ORT) when it is delivered to customers to confirm the battery's cycling performance.

[0004] However, the cycle test cycle is long. For example, it takes 3 to 4 years for 0.5P to cycle 6,000 times to 80% SOH. If the battery's cycle drop range is not predicted in advance, if the battery is delivered to the customer and the cycle drop does not meet the specifications during use, it will also cause quality customer complaints and increase after-sales costs. Summary of the Invention

[0005] Embodiments of the present invention provide a battery testing method, testing equipment, and readable storage medium, which solve the technical problem in the prior art that the battery's cycle diving interval testing cycle is long, the battery's service life cannot be accurately determined, and thus the customer experience is affected and after-sales costs are increased.

[0006] An embodiment of the present invention provides a battery testing method, the testing method comprising:

[0007] Performing charge and discharge pretreatment on the battery to be tested based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery to be tested;

[0008] Performing a static treatment of a first set time on the battery to be tested after charge and discharge pretreatment at a set temperature;

[0009] perform a charge-discharge cycle test on the to-be-tested battery after the standing treatment at a set charge-discharge rate for a set number of cycles, and perform a second set standing treatment for a second set time, wherein the set charge rate is determined based on the end-of-life capacity of the to-be-tested battery, the set discharge rate is determined based on the temperature retention state of the to-be-tested battery during the cycle charge-discharge process, and the set number of cycles is one of 50 and 100;

[0010] charge the to-be-tested battery again to the rated voltage at the set charge rate after the completion of the charge-discharge cycle test, and perform a third set standing treatment for a third set time;

[0011] disassemble the to-be-tested battery after the completion of the standing treatment to determine the lithium precipitation area of the to-be-tested battery;

[0012] query a probability relationship table between preset lithium precipitation areas and cycle diving intervals of battery capacities based on the lithium precipitation area to determine the cycle diving interval in which the battery capacity of the to-be-tested battery is located and the interval probability;

[0013] determine the service life of the to-be-tested battery based on the determined cycle diving interval and interval probability.

[0014] Further, the determination method of the probability relationship table between the preset lithium precipitation areas and the cycle diving intervals of the battery capacities comprises:

[0015] setting a plurality of test batteries;

[0016] performing charge-discharge pretreatment on each group of test batteries based on the rated charge-discharge rate and the rated charge-discharge voltage of the test batteries;

[0017] performing a first set standing treatment for a first set time on each group of test batteries after the charge-discharge pretreatment at a set temperature;

[0018] performing a charge-discharge cycle test on each group of test batteries after the standing treatment at a set charge-discharge rate for a set number of cycles to form a test control group, and performing a second set standing treatment for a second set time, wherein the set charge rate is determined based on the end-of-life capacity of the test batteries, the set discharge rate is determined based on the temperature retention state of the test batteries during the cycle charge-discharge process, and the set number of cycles includes at least 50 and 100;

[0019] charging each group of test batteries again to the rated voltage at the set charge rate after the completion of the charge-discharge cycle test, and performing a third set standing treatment for a third set time;

[0020] disassembling each group of test batteries after the completion of the standing treatment to determine the lithium precipitation area of the test batteries;

[0021] Generate a table based on the probability relationship between the lithium precipitation area and the corresponding battery capacity cycle diving interval determined by the lithium precipitation area and the battery capacity disassembly experience of different setting cycle numbers.

[0022] Further, the pre-treatment of the battery under test by charging and discharging based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery under test comprises:

[0023] Let the battery under test stand at the first temperature for a fourth set duration;

[0024] Charge the battery under test to the rated charge voltage at the rated charge rate and let it stand for a fifth set duration;

[0025] Discharge the battery under test to the rated discharge voltage at the rated discharge rate and let it stand for a sixth set duration;

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

[0027] Further, the pre-treatment of the battery under test by charging and discharging based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery under test comprises:

[0028] Charge the battery under test to the rated charge voltage at the rated charge rate and let it stand for a fifth set duration;

[0029] Discharge the battery under test to the rated discharge voltage at the rated discharge rate and let it stand for a sixth set duration;

[0030] Repeat the above charging process at the rated charge rate and discharging process at the rated discharge rate at least twice to complete the pre-treatment of the battery under test by charging and discharging.

[0031] Further, the rated charge rate is 1.67 times the rated charge rate; the rated discharge rate is 0.1 times the rated discharge rate.

[0032] Further, determining the lithium precipitation area of the test battery comprises:

[0033] Divide the lithium precipitation area of the test battery into three grades:

[0034] Grade one: no lithium precipitation, no wrinkles;

[0035] Grade two: single-side lithium precipitation area ≤10% or single-core overall-side lithium precipitation area ≤1%;

[0036] Grade three: single-side lithium precipitation area >10% or single-core overall-side lithium precipitation area >1%.

[0037] Further, the set temperature is 25℃, the first set time length is 5h, the second set time length is 30min, and the third set time length is 30min.

[0038] Further, the first temperature is 25℃, the fourth set time length is 5h, the fifth set time length is 10min, and the sixth set time length is 10min.

[0039] The embodiment of the present application further provides a battery testing device, which comprises:

[0040] at least one processor; and

[0041] a memory connected with the at least one processor; wherein,

[0042] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the battery testing method in any of the above embodiments.

[0043] The embodiment of the present application further provides a computer readable storage medium, which stores computer instructions for enabling a processor to execute the battery testing method in any of the above embodiments when the processor executes the computer instructions.

[0044] The embodiment of the present application discloses a battery test method, test equipment and a readable storage medium, the test method comprises: based on the rated charge-discharge rate and the rated charge-discharge voltage of the battery to be tested, the battery to be tested is preprocessed; the battery to be tested after the charge-discharge preprocessing is placed for a first set time at a set temperature; the battery to be tested after the standing treatment is charged and discharged at a set charge-discharge rate for a set cycle number, and the second set time is correspondingly treated; the battery to be tested after the charge-discharge cycle test is charged to the rated voltage again at the set charge rate, and the third set time is treated; the battery to be tested after the standing treatment is disassembled, and the lithium precipitation area of the battery to be tested is determined; based on the lithium precipitation area, a probability relationship table between the preset lithium precipitation area and the cycle diving interval of the battery capacity is queried, the cycle diving interval of the battery capacity of the battery to be tested and the interval probability are determined; the service life of the battery to be tested is determined based on the determined cycle diving interval and the interval probability. Through the pre-established probability relationship table, the lithium precipitation area after the charge-discharge of the set cycle number is used to determine the corresponding cycle diving interval and the interval probability. In the prior art, the cycle diving interval test period of the battery is long, the service life of the battery cannot be accurately determined, and the technical problems of affecting the customer experience and increasing the after-sales cost are solved. The technical effect of effectively shortening the test time under the condition of ensuring the test accuracy is realized, the accuracy of the battery service life determination is improved, the customer experience is improved, and the after-sales cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a flowchart of a battery test method provided by the embodiment of the present application;

[0046] Figure 2 is a structural schematic diagram of a battery test equipment provided by the embodiment of the present application. DETAILED DESCRIPTION

[0047] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0048] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to limit a specific order. Each of the embodiments of the present application can be executed alone, and each of the embodiments can also be executed in combination with each other, and the embodiments of the present application do not specifically limit this.

[0049] For a fresh battery that is normally out of production, install a steel clamp in the initial state, in one case, short-time charge and discharge cycles can be carried out in a thermostat based on the charge and discharge rate used by the user, realizing the testing of long-cycle batteries in a short time; in another case, if the user does not define the charge and discharge rate, the following test process can be carried out through the self-defined gradient of the charge and discharge rate, so as to achieve the purpose of verifying the appropriate charge and discharge rate of the battery.

[0050] Figure 1 is a flowchart of a battery testing method provided by an embodiment of the application.

[0051] As shown in Figure 1 , the battery testing method specifically includes the following steps:

[0052] S101, based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery to be tested, the battery to be tested is preprocessed.

[0053] Specifically, the battery to be tested needs to be preprocessed, that is, initial charge and discharge performance test. The initial charge and discharge performance test is the performance test in GB / T 36276-2023 national standard document, which is used to determine whether the battery capacity meets the rated capacity claimed by the manufacturer.

[0054] Optionally, S101 specifically includes:

[0055] The battery to be tested is placed at a first temperature for a fourth set duration; the battery to be tested is charged to a rated charge voltage at a rated charge rate, and is placed for a fifth set duration; the battery to be tested is discharged to a rated discharge voltage at a rated discharge rate, and is placed for a sixth set duration; the above charging process at a rated charge rate and discharging process at a rated discharge rate are cycled at least twice to complete the charge and discharge preprocessing of the battery to be tested.

[0056] Specifically, the first temperature can be selected between 23℃-27℃, assuming that the rated charge voltage is 3.65V and the rated discharge voltage is 2.5V, in the embodiment of the application, the first temperature is preferably 25℃. The fourth set duration is preferably 5h, the fifth set duration is preferably 10min, and the sixth set duration is preferably 10min.

[0057] The charge-discharge pretreatment specifically comprises: a) placing the battery to be tested at 25 DEG C for 5h, i.e. completing the process of placing the battery to be tested at the first temperature for the fourth set time period; b) charging the battery to be tested at a constant power to 3.65V using a rated charge rate Prc, and placing for 10min, i.e. completing the process of placing for the fifth set time period; c) discharging the battery to be tested at a constant power to 2.5V using a rated discharge rate Prd, and placing for 10min, i.e. completing the process of placing for the sixth set time period; and d) repeating b) and c) at least twice to complete the charge-discharge pretreatment of the battery to be tested.

[0058] S102, placing the battery to be tested after the charge-discharge pretreatment at a set temperature for a first set time period;

[0059] In the embodiment of the application, the first set time period is preferably 5h, and the set temperature is 25 DEG C. Therefore, after the charge-discharge pretreatment, the battery to be tested is placed at 25 DEG C for 5h, i.e. completing the process of placing for the first set time period.

[0060] S103, performing a charge-discharge cycle test on the battery to be tested after the placing process at a set charge-discharge rate for a set cycle number, and performing a second set time period of placing process correspondingly, wherein the set charge rate is determined based on the end-of-life capacity of the battery to be tested, the set discharge rate is determined based on the temperature maintaining state of the battery to be tested during the cycle charge-discharge process, and the set cycle number is one of 50 times and 100 times.

[0061] Optionally, the set charge rate is 1.67 times of the rated charge rate, and the set discharge rate is 0.1 times of the rated discharge rate. The second set time period is preferably 30min.

[0062] Specifically, the set charge rate can be determined according to the end-of-life capacity of the battery to be tested, i.e. when the battery is used at the rated rate Prc / Prd from the beginning of life BOL to the corresponding SOH, such as the charge rate at 60% SOH. For example, if the capacity of the battery to be tested is considered as the end of life when the capacity is 60% of the total capacity, the set charge rate is 60% of the rated charge rate, i.e. 1 / 0.6*Prc=1.67Prc. The end-of-life capacity can also be set to 60%, 70% and the like as required, which is not limited here.

[0063] The selection of the set discharge rate needs to ensure that the battery can be consistent with the ambient temperature in the cycle charge-discharge step, because the charge rate is too high in the following g) step, which can cause a large temperature rise. After placing for 30min, the battery surface temperature is too high when charging in f), which can slow down the degree of lithium precipitation, and cannot accurately help to estimate the lithium precipitation level of the battery cell. Therefore, in the embodiment of the application, the set discharge rate is 0.1Prd.

[0064] Exemplarily, due to the attenuation of the total capacity of the battery, the rated rate will increase by a corresponding multiple compared with the end of life. For example, for a 280 Ah battery, the initial charging and discharging is performed at Prc=Prd=280*3.2*0.5=448 W (the rated rate is defined as 0.5P), when the battery is cycled to 60% SOH, the total capacity of the battery is attenuated to 280*0.6=168 Ah, at this time, the corresponding 0.5P rated rate Prc=Prd=168*3.2*0.5=268.8 W, while the power of the client remains constant at the initial 448 W during the use of the battery, at this time, the initial rate is equivalent to 1.67 times the end of life rate, i.e. 448 W ÷ 268.8 W = 1.67 times.

[0065] Optionally, S103 specifically comprises:

[0066] The battery to be tested is charged at a constant power using a set charging rate to a rated charging voltage, and is rested for a second set time period; the battery to be tested is discharged at a constant power using a set discharging rate to a rated discharging voltage, and is rested for a second set time period; the charging and discharging processes using the set charging rate and the set discharging rate are cycled for a set number of cycles to complete the charging and discharging cycle test of the battery to be tested.

[0067] Specifically, after the resting process of the first set time period is completed, the charging and discharging cycle test comprises: f) the battery to be tested is charged at a constant power using 1.67Prc to 3.65V, and is rested for 30 minutes, i.e. the process of resting for the second set time period is completed; g) the battery to be tested is discharged at a constant power using 0.1Prd to 2.5V, and is rested for 30 minutes, i.e. the process of resting for the second set time period is performed again; h) the processes f) to g) are cycled for 50 times or 100 times to complete the charging and discharging cycle test of the battery to be tested.

[0068] It should be noted that the set number of cycles can be set to other values according to needs, such as 70 times, 150 times, 180 times, etc. The higher the number of times, the higher the test accuracy, and preferably 100 times are used to ensure accuracy while the test time is relatively optimal.

[0069] S104, the battery to be tested is charged to a rated voltage again using a set charging rate, and is rested for a third set time period.

[0070] Specifically, the third set time period is preferably 30 minutes. After the charging and discharging cycle test of the battery to be tested is completed, the battery to be tested is charged at a constant power using 1.67Prc to 3.65V, and is rested for 30 minutes, i.e. the process of resting for the third set time period is completed.

[0071] S105, the battery to be tested is disassembled to determine the lithium precipitation area of the battery to be tested.

[0072] Specifically, after the static process of the third set duration is completed, the battery under test is disassembled to determine the lithium precipitation of the negative electrode of the battery under test, and the lithium precipitation area is obtained.

[0073] S106, based on the lithium precipitation area, a probability relationship table between the preset lithium precipitation area and the cycle diving interval of the battery capacity is queried to determine the cycle diving interval in which the battery capacity of the battery under test is located and the interval probability.

[0074] Specifically, the cycle diving refers to the phenomenon that the cycle capacity retention rate of the battery suddenly accelerates from linear decay. Based on the lithium precipitation area, the preset probability relationship table can be queried to determine the cycle diving interval in which the battery capacity of the battery under test is located and the interval probability, so that for a long cycle battery, the diving interval of the battery cycle life (6000-10000 times) can be predicted within one month through fewer charge-discharge cycle times (such as 100 times) and interface lithium precipitation conditions.

[0075] Wherein, the probability relationship table of 50 charge-discharge cycles is slightly different from the probability relationship table of 100 charge-discharge cycles, see Table 1 and Table 2, obviously, the probability relationship table of 100 charge-discharge cycles has higher probability accuracy. In Table 1 and Table 2, ★ represents the probability of the battery jumping in the corresponding SOH interval under the current negative electrode interface lithium precipitation condition, the more ★, the greater the cycle diving probability.

[0076] Table 1. Cycle diving probability table of 100 cycles according to lithium precipitation level to different SOH

[0077] Cycling Dive SOH Interval Lithiation Level One Lithiation Level Two Lithiation Level Three BOL - 90% SOH No No ★ 90% SOH - 80% SOH No ★ ★★ 80% SOH - 70% SOH ★ ★★ ★★★ 70% SOH - 60% SOH ★★ ★★★ ★★★★

[0078] Table 2. Cycle diving probability table of 50 cycles according to lithium precipitation level to different SOH

[0079] Cycling Dive SOH Interval Lithiation Level One Lithiation Level Two Lithiation Level Three BOL - 90% SOH No ★ ★★ 90% SOH - 80% SOH ★ ★★ ★★★ 80% SOH - 70% SOH ★★ ★★★ ★★★★ 70% SOH - 60% SOH ★★★ ★★★★ ★★★★★

[0080] S107, based on the determined cycle diving interval and interval probability, the service life of the battery under test is determined.

[0081] Specifically, after the cycle diving interval and interval probability are determined, the cycle life of the battery can be quickly predicted and the user warranty condition can be evaluated, which improves the user's use feeling.

[0082] In the embodiment of the present application, by pre-establishing the probability relationship table between the lithium precipitation area and the cycle diving interval of the battery capacity, the lithium precipitation area of the battery after the set number of cycles of charge and discharge test is looked up to determine the corresponding cycle diving interval and the interval probability, which solves the technical problems in the prior art that the cycle diving interval test period of the battery is long, 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 of effectively shortening the test time under the condition of ensuring the test accuracy, improves the accuracy of determining the service life of the battery, improves the customer experience and reduces the after-sales cost.

[0083] Optionally, the determination method of the probability relationship table between the preset lithium precipitation area and the cycle diving interval of the battery capacity comprises:

[0084] S1, a plurality of test batteries are set.

[0085] Specifically, at least 6PCS (Power Conversion System, energy storage converter) batteries are selected and divided into two or more groups for testing, each group has different cycle numbers, forming a control group.

[0086] S2, based on the rated charge and discharge rate and the rated charge and discharge voltage of the test battery, the charge and discharge pretreatment is performed on each group of test batteries.

[0087] Specifically, the charge and discharge pretreatment specifically comprises: 1) each group of test batteries is placed at a first temperature of 25℃ for a fourth set time of 5h; 2) each group of test batteries is charged to 3.65V at a rated charge rate Prc, and is placed for a fifth set time of 10min; 3) each group of test batteries is discharged to 2.5V at a rated discharge rate Prd, and is placed for a sixth set time of 10min; 4) cycle 2)~3) at least twice to complete the charge and discharge pretreatment of each group of test batteries.

[0088] S3, each group of test batteries after the charge and discharge pretreatment is placed at a set temperature for a first set time.

[0089] Specifically, after the charge and discharge pretreatment, each group of test batteries is placed at 25℃ for a first set time of 5h.

[0090] S4, each group of test batteries after the placement treatment is charged and discharged at a set charge and discharge rate for a set number of cycles to form a test control group, and a second set time of placement treatment is performed accordingly, wherein 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 retention state of the test battery during the cycle charge and discharge process, and the set number of cycles includes at least 50 times and 100 times;

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

[0092] S5, each group of test batteries that complete the charge-discharge cycle test is charged to the rated voltage again at a set charge rate, and a static treatment is performed for a third set duration.

[0093] Specifically, after the charge-discharge cycle test of each group of test batteries is completed, each group of test batteries is charged to 3.65V at constant power again at 1.67Prc, and static for a third set duration of 30min.

[0094] S6, each group of test batteries that completes the static treatment is disassembled to determine the lithium precipitation area of the test battery.

[0095] Specifically, after 100Ah, 280Ah, 314Ah are batched according to steps S1~S5, the cycle curves of the lithium precipitation grades shown in tables 1 and 2 are summarized by disassembling the interface to 90%SOH, 80%SOH, 70%SOH, 60%SOH.

[0096] Optionally, S6, determining the lithium precipitation area of the test battery includes: dividing the lithium precipitation area of the test battery into three grades: grade one: no lithium precipitation, no wrinkles; grade two: single-side lithium precipitation area ≤10% or single-core package whole-side lithium precipitation area ≤1%; grade three: single-side lithium precipitation area >10% or single-core package whole-side lithium precipitation area >1%.

[0097] Specifically, after the static treatment of the third set duration is completed, each group of test batteries is disassembled to determine the negative lithium precipitation of each group of test batteries, obtain the lithium precipitation area, and grade the lithium precipitation area. It should be noted that if the parallel samples or the positive and negative sides of a single core package are cycled the same number of times, there is a difference in lithium precipitation grade, and the sample with more serious lithium precipitation condition is determined; for the winding structure battery, the electrode piece between the center lines of the continuous two R angles is recorded as 1(single) side, and for the laminated structure single electrode piece, it is recorded as 1(single) side.

[0098] S7, based on the lithium precipitation area of different set cycle times and the corresponding battery capacity disassembly experience, the probability relationship between the lithium precipitation area and the cycle diving interval of the battery capacity is determined, and a table is generated.

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

[0100] In an embodiment of the present invention, the lithium plating area of ​​a single electrode and the entire surface of a single core package after different numbers of charge and discharge cycles of the battery is quantified, and lithium plating levels one, two, and three are defined according to the severity of lithium plating. Through the lithium plating area and cycle SOH cell disassembly experience of power storage products, a connection is established between the lithium plating level and the probability of the battery dropping in different SOH intervals, so that the cycle life of the battery can be quickly predicted, the customer warranty status can be evaluated, and after-sales warranty issues can be reduced.

[0101] Figure 2 1 is a schematic diagram of a battery test device provided in an embodiment of the present invention. The battery test device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The battery test device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, 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 examples and are not intended to limit the implementation of the present invention described and / or required 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 and a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores a computer program executable by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or loaded from the storage unit 18 into the random access memory (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 connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

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

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

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

[0106] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0107] Computer programs implementing the test methods for the batteries of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program running on the processor implements the functions / operations specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as part of a standalone software package, and partially on a remote machine or entirely on a remote machine or server.

[0108] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal form, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0109] To provide for interaction with a user, the systems and techniques described here can be implemented on a battery testing device having 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 a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the battery testing device. Other kinds of devices can be used to provide for interaction with a user as well; 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 acoustic, speech, or tactile input.

[0110] The systems and techniques described herein can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0111] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0112] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the application can be executed in parallel, executed in sequence, or executed in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application is not limited herein.

[0113] The above detailed description does not constitute a limitation on the protection scope of the present application. 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 replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery testing method, characterized in that: The test method includes: Performing charge and discharge pretreatment on the battery to be tested based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery to be tested; Performing a static treatment for a first set time on the battery to be tested after charge and discharge pretreatment at a set temperature; Performing a charge-discharge cycle test on the battery under test after the static treatment at a set charge-discharge rate for a set number of cycles, and performing a static treatment for a second set time accordingly, wherein the set charge rate is determined based on the end-of-life capacity of the battery under test, the set discharge rate is determined based on the temperature maintenance state of the battery under test during the cyclic charge and discharge process, and the set number of cycles is one of the following: 50 times and 100 times; charging the battery to be tested that has completed the charge-discharge cycle test again at the set charge rate to a rated voltage, and performing a static treatment for a third set time; Disassembling the battery to be tested after the static state, and determining the lithium deposition area of ​​the battery to be tested; Based on the lithium deposition area, query a probability relationship table between a preset lithium deposition area and a cycle drop interval of the battery capacity to determine the cycle drop interval in which the battery capacity of the battery to be tested is located and the probability of being in the interval; The service life of the battery to be tested is determined based on the determined cycle water drop interval and the probability of being in the 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 deposition area and the cycle drop interval of the battery capacity includes: Set up multiple test batteries; Performing charge and discharge pretreatment on each group of the test batteries based on the rated charge and discharge rate and the rated charge and discharge voltage of the test batteries; performing a static treatment for a first set time at a set temperature on each group of test batteries after charge and discharge pretreatment; Performing a charge-discharge cycle test for a set number of cycles at a set charge-discharge rate on each group of test batteries after the static treatment to form a test control group, and performing a static treatment for a second set time accordingly, wherein the set charge rate is determined based on the end-of-life capacity of the test battery, and the set discharge rate is determined based on the temperature maintenance state of the test battery during the cyclic charge and discharge process, and the set number of cycles includes at least 50 times and 100 times; charging the test batteries of each group that have completed the charge-discharge cycle test to the rated voltage at the set charge rate again, and performing a static treatment for a third set time; Disassembling each group of test batteries that have been left to stand, and determining the lithium deposition area of ​​the test batteries; Based on the lithium plating area and the corresponding battery capacity disassembly experience for different set cycle times, the probability relationship between the lithium plating area and the cycle drop interval of the battery capacity is determined, and a table is generated.

3. The battery testing method according to claim 1, wherein: Performing charge and discharge preprocessing on the battery to be tested based on the rated charge and discharge rate and the rated charge and discharge voltage of the battery to be tested includes: placing the battery under test at the first temperature for a fourth set time; Using a rated charging rate, the battery to be tested is charged at a constant power to a rated charging voltage, and left to stand for a fifth set time; Discharging the battery under test at a constant power to a rated discharge voltage using a rated discharge rate, and leaving the battery at rest for a sixth set time; The above process of charging using the rated charge rate and discharging using the rated discharge rate is cycled at least twice to complete the charge and discharge pretreatment of the battery to be tested.

4. The battery testing method according to claim 1, wherein: The battery to be tested after the static treatment is subjected to a charge-discharge cycle test for a set number of cycles at a set charge-discharge rate, and the static treatment for a second set time is performed accordingly, including: Using a set charging rate, the battery to be tested is charged at a constant power to a rated charging voltage, and left to stand for a second set time; Discharging the battery to be tested at a constant power to a rated discharge voltage using a set discharge rate, and leaving it to rest for a second set time; The process of charging at the set charge rate and discharging at the set discharge rate is repeated based on the set number of cycles to complete the charge and discharge cycle test of the battery to be tested.

5. The battery testing method according to claim 4, characterized in that: The set charge rate is 1.67 times the rated charge rate; the set discharge rate is 0.1 times the rated discharge 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 battery is divided into three levels: Level 1: no lithium deposition, no wrinkles; Level 2: lithium deposition area on a single surface ≤ 10% or lithium deposition area on the entire surface of a single core package ≤ 1%; Level 3: The lithium deposition area on a single surface is greater than 10% or the lithium deposition area on the entire surface of a single core package is greater than 1%.

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

8. The battery testing method according to claim 3, characterized in that: The first temperature is 25° C., the fourth set time is 5 hours, the fifth set time is 10 minutes, and the sixth set time 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 executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the battery testing method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery testing method according to any one of claims 1 to 8 when executed.

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