Battery charging and discharging test method, battery test cabinet and storage medium

Abstract

The invention discloses a battery charging and discharging test method, a battery test cabinet and a storage medium, and is applied to the technical field of batteries. The charging and discharging test method comprises the following steps: acquiring battery parameters of a to-be-tested battery when the current charging and discharging cycle operation is completed, wherein the battery parameters at least comprise static alternating-current internal resistance and actual battery capacity; and when at least one of the condition that the static alternating-current internal resistance is greater than the real-time internal resistance threshold or the actual battery capacity is smaller than the preset capacity threshold is met, stopping executing the charge-discharge cycle operation. By limiting the static alternating-current internal resistance and the actual battery capacity of the to-be-tested battery, the safety of the to-be-tested battery in the charge-discharge test can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery charge and discharge test method, a battery test cabinet, and a non-transitory computer-readable storage medium. Background Art

[0002] As an indispensable energy carrier in modern society, batteries are widely used in consumer electronics, new energy vehicles, energy storage systems, and other fields, providing power for equipment operation, transportation, and energy storage. The battery's charge and discharge performance directly impacts the user experience of devices, the vehicle's endurance, and the stability of energy storage systems.

[0003] Battery charge and discharge testing is of great significance. By simulating actual usage scenarios and testing the battery's charge and discharge performance, potential battery issues can be promptly identified, production processes optimized, and product competitiveness enhanced. Battery charge and discharge testing drives innovation in battery technology, aiding the development of more efficient and safer battery products and accelerating the development of the new energy industry.

[0004] Traditional battery charge and discharge testing methods rely on a single threshold protection, which has a high false trigger rate under fluctuations in temperature, voltage, etc., and poses safety issues. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery charge and discharge test method, a battery test cabinet, and a non-transitory computer-readable storage medium. These methods improve the safety of charge and discharge tests by limiting the static AC internal resistance and actual battery capacity of the battery.

[0006] In a first aspect, the present application provides a battery charge and discharge test method, comprising obtaining battery parameters of a battery to be tested when completing a current charge and discharge cycle operation, wherein the battery parameters include at least a static AC internal resistance and an actual battery capacity; and stopping the charge and discharge cycle operation when at least one of the conditions that the static AC resistance is greater than a real-time internal resistance threshold or the actual battery capacity is less than a preset capacity threshold is satisfied.

[0007] In a second aspect, the present application provides a battery testing cabinet, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned battery charge and discharge testing method when executing the program.

[0008] In a third aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned battery charge and discharge test method when executed by a processor.

[0009] The battery charge and discharge test method, battery test cabinet, and non-transient computer-readable storage medium provided in the embodiments of the present application are such that, as the number of charge and discharge cycles increases, the static AC internal resistance of the battery under test will gradually increase due to factors such as pulverization of motor materials and reduction of electrolyte, and the actual battery capacity will gradually decrease. If the static AC internal resistance increases too much and / or the actual battery capacity is too low, it can easily lead to local overheating and even safety accidents. By limiting the static AC internal resistance and actual battery capacity of the battery under test, and promptly stopping the charge and discharge test for the battery under test with abnormal static AC internal resistance and / or actual battery capacity values, the safety of the charge and discharge test can be improved, effectively reducing the probability of safety risks.

[0010] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0012] Figure 1 This is an application scenario diagram of the battery charge and discharge test method provided in an embodiment of the present application;

[0013] Figure 2 This is a schematic diagram of the first flow chart of the battery charge and discharge test method provided in an embodiment of the present application;

[0014] Figure 3 This is a second flow chart of the battery charge and discharge test method provided in an embodiment of the present application;

[0015] Figure 4 3 is a schematic diagram of a third flow chart of a battery charge and discharge test method provided in an embodiment of the present application;

[0016] Figure 5 4 is a schematic diagram of a fourth flow chart of a battery charge and discharge test method provided in an embodiment of the present application;

[0017] Figure 6 This is a module diagram of a battery charge and discharge test device provided in an embodiment of the present application;

[0018] Figure 7 Schematic diagram of the structure of the battery test cabinet provided in the embodiment of the present application. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present application in detail. Examples of the embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0020] For ease of understanding, the following first introduces the technical background and application scenarios of this application:

[0021] Batteries are the energy cornerstone of modern society and play an indispensable role in life and production. They provide electricity for various devices to enable various batteries to have the ability to operate continuously, promote scientific and technological progress and energy transformation, and are a key factor in achieving convenient life and sustainable development.

[0022] Performing charge and discharge tests on batteries is of great significance. Through charge and discharge tests, we can evaluate battery performance, understand key indicators such as battery capacity and energy density, determine the amount of electricity the battery can store and release, and determine whether the battery meets actual usage requirements. Furthermore, charge and discharge tests help detect the battery's charge and discharge efficiency and understand the energy conversion during the charge and discharge process, which is crucial for optimizing battery usage and charging strategies. At the same time, long-term charge and discharge tests can simulate the battery's actual cycling process and thus predict the battery's lifespan, allowing users to prepare for replacement or maintenance in advance. Furthermore, charge and discharge tests can identify potential battery problems under different conditions, such as safety hazards such as overheating, overcharging, and over-discharging. This helps to promptly improve battery design and protection measures, ensure the safety and reliability of battery use, and avoid various accidents and losses caused by battery failures.

[0023] However, existing battery charge and discharge testing methods rely on a single threshold protection to ensure the safety of the testing process, which can easily lead to safety risks.

[0024] The battery charge and discharge test method provided in the present application limits the static AC internal resistance of the battery and the actual battery capacity, and promptly stops the charge and discharge test of the battery that reaches the preset cycle end condition, thereby improving the safety of the charge and discharge test and effectively reducing the probability of safety risks.

[0025] See also Figure 1 , Figure 1 Figure 1 is an application scenario diagram of a battery charge and discharge testing method provided in an embodiment of the present application. The application scenario provided in this application includes a battery testing cabinet 100 and a battery to be tested 110. Battery to be tested 110 is located in the battery testing cabinet 100, which includes a cabinet body 10, a controller 20, a power supply 30, a test circuit 40, and a test instrument 50. The battery charge and discharge testing method provided in this application can be executed by the controller 20.

[0026] The cabinet 10 is the outer shell structure used to house and protect the various components within the battery test cabinet 100 (such as the controller 20, power supply 30, and test circuit 40). The cabinet 10 provides physical support for the various internal components, preventing damage or loose connections due to vibration, collision, and other factors, thereby ensuring the normal operation of charge and discharge tests. The cabinet 10 also provides environmental protection, electromagnetic shielding, and safety measures for the various internal components, thereby extending the service life of the battery test cabinet 100 and improving safety.

[0027] Optionally, the material of the cabinet 10 can be metal material (such as cold-rolled steel plate, stainless steel, etc.), engineering plastic (such as polycarbonate, ABS plastic, etc.), composite material (such as carbon fiber reinforced composite material, etc.), etc., and the embodiment of the present application is not limited to this.

[0028] The controller 20 is a device with data processing capabilities. The controller 20 is connected to the power supply 30, the test circuit 40, and the test instrument 50, respectively, and can control the operation of the power supply 30, the test circuit 40, and the test instrument 50 to perform charge and discharge tests on the battery 110 to be tested. Optionally, the controller 20 can be a microcontroller (MCU), a single-chip microcomputer, a system on a chip (SoC), a field programmable gate array (FPGA), etc., which is not limited in the embodiments of the present application.

[0029] The power supply 30 is a device that provides electrical energy. The power supply 30 is connected to the controller 20, the test circuit 40, and the test instrument 50, respectively, to provide power to the controller 20, the test circuit 40, and the test instrument 50, respectively, to ensure the normal operation of the controller 20, the test circuit 40, and the test instrument 50. Optionally, the power supply 30 may be a linear DC power supply, a switching DC power supply, a programmable power supply, or the like, which is not limited in the present embodiment.

[0030] The test circuit 40 refers to a circuit system composed of various electronic components (such as resistors, capacitors, inductors, transistors, integrated circuits, etc.). The test instrument 50 refers to a device used to perform various performance tests and parameter measurements on the battery. The test circuit 40, the test instrument 50, and the battery under test 110 are interconnected. The power supply 30 charges and discharges the battery under test 110 through the test circuit 40. Under the control of the controller 20, the test circuit 40 and the test instrument 50 can measure, control, and analyze various parameters of the battery under test 110 in accordance with specific test requirements to obtain data and information related to the performance of the battery under test 110.

[0031] Optionally, the testing instrument 50 may include: an internal resistance meter, a high-precision multimeter, an oscilloscope, a data collector, a temperature tester, etc., which is not limited in the embodiment of the present application.

[0032] The battery under test 110 is a battery that needs to be charged and discharged. Optionally, the battery under test 110 can be a lithium-ion battery (such as a lithium-ion single cell, a lithium-ion battery module, a lithium-ion battery pack, etc.), a lead-acid battery, a nickel-metal hydride battery, etc., which is not limited in this embodiment of the present application.

[0033] Based on the above technical background and the introduction of related scenarios, the embodiment of the present application provides a battery charge and discharge test method. The battery charge and discharge test method is introduced in detail below:

[0034] See also Figure 2 A battery charge and discharge test method provided in an embodiment of the present application is implemented by steps 011 and 012, which are described in detail below.

[0035] Step 011: Obtain battery parameters of the battery under test when completing the current charge and discharge cycle operation, the battery parameters at least including static AC internal resistance and actual battery capacity;

[0036] The charge-discharge cycle operation refers to the process of regularly charging and discharging the battery under test. For example, the charging process is to charge the battery under test until the voltage of the battery under test reaches the charge cutoff voltage and then stop charging; the discharging process is to discharge the battery under test until the voltage of the battery under test reaches the discharge cutoff voltage and then stop discharging.

[0037] The static AC resistance refers to the resistance of the battery to AC current when it is in a relatively static state (without large current charging or discharging).

[0038] The actual battery capacity refers to the amount of charge that the battery under test can discharge during an actual test.

[0039] Specifically, after the battery under test completes a charge-discharge cycle, the static AC internal resistance of the battery under test is obtained from the internal resistance meter. Alternatively, the internal resistance meter can be used to obtain the static AC internal resistance of the battery under test using methods such as AC impedance measurement, electrochemical impedance spectroscopy (EIS), and high-frequency injection.

[0040] For example, using an internal resistance meter to obtain the static AC internal resistance of a battery under test using the AC impedance method involves correctly connecting the positive and negative test ports of the internal resistance meter to the positive and negative terminals of the battery under test. The internal resistance meter applies an AC signal of a specific frequency and amplitude to the battery under test and accurately measures the impedance response of the battery under test at different specific frequencies, including the impedance amplitude and phase angle. The internal resistance meter then fits the measured data (i.e., the impedance amplitude and phase angle) to an equivalent circuit model to obtain the static AC internal resistance of the battery under test.

[0041] By acquiring parameters such as voltage, current, and time during the charge or discharge process of the battery under test, the result obtained by integrating the current-time relationship curve is used as the actual battery capacity of the battery under test. For example, if the battery under test is charged with a constant current, the product of the constant current charging current and the charging time is the actual battery capacity of the battery under test.

[0042] Optionally, the static AC internal resistance can be set to be obtained after each charge and discharge cycle is completed; it can also be obtained after every N charge and discharge cycles are completed, for example, the static AC internal resistance of the 1st, 11th, 21st, etc. is obtained in sequence; it can also be obtained at different intervals in different cycle time periods, for example, the static AC internal resistance is not obtained within 100 cycles, the value of the static AC internal resistance is obtained every 20 cycles between 100 and 500 cycles, and the value of the static AC internal resistance is obtained every 10 cycles between 500 and 1000 cycles.

[0043] Optionally, the number of times the actual battery capacity is set to be obtained is similar to the number of times the static AC internal resistance is set to be obtained, and will not be described again to avoid repetition.

[0044] Step 012: When at least one of the following conditions is satisfied: the static AC resistance is greater than the real-time internal resistance threshold or the actual battery capacity is less than the preset capacity threshold, the charge and discharge cycle operation is stopped.

[0045] The real-time internal resistance threshold is a threshold determined based on the number of cycles and the static time.

[0046] The preset capacity threshold is a threshold set based on experience.

[0047] Specifically, if the static AC internal resistance is greater than the real-time internal resistance threshold, the battery under test will generate excessive heat during the charge and discharge cycle. A large amount of electrical energy will be converted into heat and lost, seriously reducing the energy conversion efficiency of the battery under test. Furthermore, excessive heat will cause the temperature of the battery under test to rise, accelerating the decomposition and aging of the internal chemical substances of the battery under test, reducing the service life of the battery under test, and even causing safety accidents such as combustion or even explosion of the battery under test. Therefore, to improve the safety of charge and discharge tests, the charge and discharge cycle operation of the battery under test is stopped when the static AC internal resistance of the battery under test is greater than the real-time internal resistance threshold.

[0048] If the actual battery capacity is less than the preset capacity threshold, the battery under test can provide less power. Further charge and discharge cycles on the battery under test in this situation can cause the chemical substances within the battery to overreact, accelerating battery aging and disrupting the internal chemical balance, leading to safety hazards such as overheating, combustion, and even explosion. Therefore, to improve the safety of charge and discharge tests, the charge and discharge cycles of the battery under test are stopped when the actual battery capacity is less than the preset capacity threshold.

[0049] Therefore, when at least one of the following conditions is met: the static AC resistance is greater than the real-time internal resistance threshold or the actual battery capacity is less than the preset capacity threshold, stopping the charge and discharge cycle operation on the battery to be tested can improve the safety of the charge and discharge test and effectively reduce the probability of safety risks.

[0050] In some embodiments, the real-time internal resistance threshold is determined based on the initial AC internal resistance of the battery to be tested, the current cycle number, and a preset duration.

[0051] The initial AC internal resistance refers to the static AC internal resistance of the battery under test obtained after the first charge-discharge cycle test. Alternatively, the initial AC internal resistance may be the static AC internal resistance of the battery under test after the first charge-discharge cycle, or the average of the static AC internal resistances after the first M charge-discharge cycles (M is an integer greater than 1).

[0052] The preset duration is a time length set based on experience. The static AC internal resistance of the battery under test is detected at the preset duration after the battery under test completes a charge-discharge cycle. For example, the preset duration may be 10 minutes, 30 minutes, or 60 minutes. Optionally, the preset duration is any duration between [10, 60] minutes.

[0053] As the number of charge and discharge cycles of the battery under test increases, the battery under test gradually ages, and the electrode material inside the battery under test undergoes irreversible chemical reactions (such as the loss of motor active substances, destruction of lattice structure, etc.). Passivation film and other products are formed at the interface between the electrode and the electrolyte inside the battery under test, thereby increasing the resistance to charge transfer, and ultimately leading to an increase in the static AC internal resistance of the battery under test.

[0054] Polarization will occur in the battery under test during the charge and discharge cycle. If the static AC internal resistance is tested immediately after charge and discharge, there will still be a large polarization effect inside the battery under test. The test value includes the polarization internal resistance and the actual static AC internal resistance, which cannot accurately reflect the static AC internal resistance of the battery under test.

[0055] Setting the real-time internal resistance threshold based on the current cycle count and preset duration of the battery under test can accurately assess the health of the battery under test and improve the reliability of charge and discharge tests.

[0056] In some embodiments, the real-time internal resistance threshold of the battery to be tested satisfies the relationship expressed by formula (1):

[0057]

[0058] Among them, R th (N, t) represents the real-time internal resistance threshold of the battery under test, N represents the current cycle number of the battery under test, t represents the preset duration, R0 represents the initial AC internal resistance of the battery under test, and α and β represent constant parameters determined based on the battery under test.

[0059] For example, when the battery to be tested is a lithium-ion battery, α=0.00082 and β=0.0005.

[0060] In some embodiments, the preset capacity threshold is determined based on an average battery capacity of the previous N charge and discharge cycles and a preset lower limit of battery health of the battery to be tested.

[0061] The preset lower limit of battery health is a threshold value set based on experience and used to measure the performance and life status of the battery to be tested.

[0062] Specifically, the preset capacity threshold can be the product of the average actual battery capacity at the completion of the 1st to Nth charge-discharge cycles and the preset battery health lower limit of the battery under test. Where N is a positive integer; optionally, N is greater than 2 and less than 11, which ensures the accuracy and reliability of the preset capacity threshold.

[0063] For example, when the battery to be tested is a lithium-ion battery, the preset capacity threshold is the product of the average value of the actual battery capacity when the first to third charge and discharge cycles are completed and the preset battery health lower limit of the battery to be tested.

[0064] In some embodiments, the lower limit of the battery health is in the interval (70%, 80%).

[0065] Specifically, within the interval (70%, 80%), the battery to be tested can usually maintain relatively stable charge and discharge performance. When the actual battery capacity of the battery to be tested is greater than the lower limit of the battery health, the charge and discharge test of the battery to be tested can be adapted to most scenarios of actual use of the battery to be tested and accurately evaluate the charge and discharge performance of the battery to be tested. When the actual battery capacity of the battery to be tested is not greater than the lower limit of the battery health, stopping the charge and discharge test of the battery to be tested can avoid excessive discharge damage to the battery to be tested, reduce safety risks, and save time and cost of charge and discharge testing.

[0066] In some embodiments, see Figure 3 Optionally, step 011 includes:

[0067] Step 0111: After the charge and discharge cycle operation is completed and the device is left to stand for a preset time, the static AC internal resistance is obtained.

[0068] The preset duration is a time length set based on experience. Different preset durations can be set depending on the battery being tested. For example, if the battery being tested is a lithium-ion battery, the preset duration can be set to 30 minutes.

[0069] Specifically, polarization occurs during the battery's charge-discharge cycle. If the static AC internal resistance is measured immediately after charge and discharge, a significant polarization effect will still be present. The resulting value will include both the polarized internal resistance and the true static AC internal resistance, failing to accurately reflect the battery's true static AC internal resistance. Therefore, to eliminate the polarization effect, the static AC internal resistance should be measured after the battery has been left idle for a preset period of time after the charge-discharge cycle. This improves the reliability of the charge-discharge test.

[0070] In some embodiments, see Figure 4 Optionally, step 011 includes:

[0071] Step 0112: When the current cycle number of the battery to be tested is greater than the preset cycle number, obtain battery parameters of the battery to be tested when performing charge and discharge cycle operations.

[0072] The preset number of cycles is a value set based on experience.

[0073] Specifically, when the current number of cycles of the battery to be tested is not greater than the preset number of cycles, the internal structure of the battery to be tested is usually in a relatively stable state, and the battery parameters are generally within the normal range (that is, the charge and discharge cycle can continue). The battery parameters are not obtained before the preset number of cycles, which can reduce the use time of the charge and discharge detection, reduce the loss and energy consumption of the battery detection cabinet, reduce data redundancy, and thus reduce the cost of charge and discharge detection.

[0074] When the current cycle number of the battery to be tested is greater than the preset cycle number, the battery parameters are obtained, so as to focus on the key stages of the battery to be tested, pay attention to the values of the battery parameters in a targeted manner, and stop the cycle in time.

[0075] Optionally, the static AC internal resistance and actual battery capacity of the battery to be tested may be obtained respectively after different numbers of cycles.

[0076] In some embodiments, see Figure 5 The battery charge and discharge test method also includes steps 013 and 014, which are described in detail below.

[0077] Step 013: Obtaining operating parameters of the battery under test during the charge and discharge cycle operation, where the operating parameters include at least one of temperature, voltage, current, charge and discharge time, and temperature change rate;

[0078] Step 014: If the operating parameters do not meet the preset charge and discharge cycle conditions, stop the charge and discharge cycle operation.

[0079] The charge and discharge time refers to the starting time difference of a charge and discharge cycle operation.

[0080] The preset charge-discharge cycle condition refers to one or more set conditions. If the one or more conditions are met, the charge-discharge cycle operation can continue to be performed on the battery to be tested.

[0081] For example, the preset charge-discharge cycle conditions include at least one of the following:

[0082] The temperature is within the preset temperature range;

[0083] The voltage is within the preset voltage range;

[0084] The current is within the preset current range;

[0085] The charge and discharge time is within the preset charge and discharge time range;

[0086] The absolute value of the temperature change rate is less than the preset change rate.

[0087] Specifically, different types of batteries under test correspond to different preset charge-discharge cycle conditions. Limiting the temperature and temperature change rate during the charge-discharge cycle prevents thermal runaway and ensures the stability of the charge-discharge test. Limiting the voltage, current, and charge-discharge time during the charge-discharge cycle prevents overcharging or discharging, improving the efficiency and accuracy of the charge-discharge test.

[0088] The technical solution of the present invention is further described in detail below through specific embodiments.

[0089] Example 1: The actual battery capacity of the battery 1 to be tested (lithium-ion battery) is less than a preset capacity threshold, triggering the stopping of the charge and discharge cycle operation.

[0090] Table 1 Some battery parameters and judgments of the battery 1 to be tested

[0091]

[0092]

[0093] Wherein, C0=6.0Ah represents the average value of the actual battery capacity obtained from the 1st, 2nd, and 3rd charge-discharge cycles of the battery 1 under test;

[0094] R0=5.80mΩ represents the average value of the static AC internal resistance obtained from the 1st, 2nd, and 3rd charge-discharge cycles of the battery 1 under test;

[0095] SOH cap =80% represents the preset lower limit of battery health of the battery 1 to be tested

[0096] t=30min represents the preset duration of the battery 1 to be tested;

[0097] C n Indicates the actual battery capacity obtained from the nth charge and discharge cycle of the battery 1 under test;

[0098] C th =4.80Ah represents the preset capacity threshold of the nth charge and discharge cycle of the battery 1 to be tested;

[0099] R ACn Indicates the static AC internal resistance obtained from the nth charge and discharge cycle of the battery 1 under test;

[0100] R th Indicates the real-time internal resistance threshold of the nth charge and discharge cycle of the battery 1 under test;

[0101] As can be seen from Table 1, when n=2187, after the battery 1 under test has been charged and discharged 2187 times:

[0102] Actual battery capacity C 2197 =4.79Ah, based on C0=4.8Ah, C 2187 <C th It is determined to terminate the cycle test action. Detect the static AC internal resistance R AC (2187) = 7.25 mΩ. The real-time internal resistance threshold R after the 2187th charge and discharge cycle is calculated according to formula (1). th (2187,30)=7.28mΩ, error accuracy <1%.

[0103] Example 2: The static AC internal resistance of the battery 2 to be tested (lithium-ion battery) is greater than the real-time internal resistance threshold, triggering the cessation of the charge and discharge cycle operation.

[0104] Table 2 Partial battery parameters and judgment of battery 2 to be tested

[0105]

[0106] Wherein, C0=4.8Ah represents the average value of the actual battery capacity obtained from the 1st, 2nd, and 3rd charge-discharge cycles of the battery 2 under test;

[0107] R0=14mΩ represents the average value of the static AC internal resistance obtained from the 1st, 2nd, and 3rd charge-discharge cycles of the battery 2 under test;

[0108] SOH cap =80% represents the preset lower limit of battery health of the battery 2 to be tested

[0109] t=30min represents the preset duration of the battery 2 to be tested;

[0110] C n Indicates the actual battery capacity obtained from the nth charge and discharge cycle of the battery 2 under test;

[0111] C th =3.84Ah represents the preset capacity threshold of the nth charge and discharge cycle of the battery 2 to be tested;

[0112] R ACn represents the static AC internal resistance obtained from the nth charge and discharge cycle of the battery 2 under test;

[0113] R th Indicates the real-time internal resistance threshold of the nth charge and discharge cycle of the battery 2 under test;

[0114] As can be seen from Table 2, when n=1765, after the battery 2 under test has been charged and discharged 1765 times:

[0115] Actual battery capacity C 1765 =3.9Ah (battery health is 81.04%), C 1765 >C th . Detect static AC internal resistance R AC (1765) = 17.52 mΩ. The real-time internal resistance threshold R after the 1765th charge and discharge cycle is calculated according to formula (1). th (1765,30)=17.45mΩ,R AC (1765)>R th (1765,30), determine the termination of the loop test action, the error accuracy is <1%.

[0116] In summary, by adopting the technical solution of the present application, by limiting the static AC internal resistance and actual battery capacity of the battery, the charge and discharge test of the battery to be tested with abnormal values of the static AC internal resistance and / or actual battery capacity can be stopped in time, thereby improving the safety of the charge and discharge test and effectively reducing the probability of safety risks.

[0117] According to the method described in the above embodiment, the present application embodiment also provides a battery charge and discharge test device 200 for executing the steps in the above battery charge and discharge test method. Figure 6 , Figure 6 : is a module diagram of a battery charge and discharge test device 200 provided in an embodiment of the present application. The battery charge and discharge test device 200 includes:

[0118] An acquisition module 201 is configured to acquire battery parameters of the battery under test when the battery completes a current charge and discharge cycle operation, wherein the battery parameters include at least a static AC internal resistance and an actual battery capacity;

[0119] The control module 202 is configured to stop the charge-discharge cycle operation when at least one of the following conditions is satisfied: the static AC resistance is greater than the real-time internal resistance threshold or the actual battery capacity is less than the preset capacity threshold.

[0120] It should be noted that the specific details of each module unit in the above-mentioned battery charge and discharge test device have been described in detail in the embodiment of the above-mentioned battery charge and discharge test method, and will not be repeated here.

[0121] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0122] In some embodiments, the battery charge and discharge testing device in the embodiments of the present application can be implemented in hardware, such as a battery test cabinet, or a component in the battery test cabinet, such as an integrated circuit or chip; the battery charge and discharge testing device can also be implemented in software, such as as an application installed in a battery test cabinet.

[0123] In some embodiments, see Figure 7 , Figure 7 3 is a schematic diagram of the structure of a battery testing cabinet provided in an embodiment of the present application. Battery testing cabinet 300 includes a processor 301 and a memory 302. Memory 302 stores a computer program 303 executable on processor 301. When executed by processor 301, program 303 implements the various processes of the aforementioned embodiment of the battery charge and discharge testing method, achieving the same technical effects. To avoid repetition, these details are not repeated here.

[0124] An embodiment of the present application also provides a non-transitory computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the various processes of the embodiment of the above-mentioned battery charge and discharge test method and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0125] The processor may be the processor in the battery test cabinet in the above embodiment. The computer readable storage medium may be a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0126] Computer-readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include RAM, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory or other solid-state memory technology, CD-ROM, Digital Versatile Disc (DVD) or other optical storage, tape cassettes, magnetic tape, disk storage or other magnetic storage devices. Of course, those skilled in the art will appreciate that computer storage media are not limited to the above.

[0127] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the aforementioned battery charge and discharge testing method. The processor may be the processor in the battery testing cabinet described in the aforementioned embodiment. When executed by the processor, the computer program implements each of the processes described in the aforementioned embodiment of the battery charge and discharge testing method, achieving the same technical effects. To avoid repetition, these processes are not described here.

[0128] It is understandable that in the specific implementation of this application, data related to user identity or characteristics is involved. When the above embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0129] In the description of this specification, the reference terms "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0130] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0131] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery charge and discharge test method, characterized in that: include: Obtaining battery parameters of the battery under test when completing the current charge and discharge cycle operation, wherein the battery parameters include at least static AC internal resistance and actual battery capacity; When at least one of the conditions that the static AC resistance is greater than a real-time internal resistance threshold or the actual battery capacity is less than a preset capacity threshold is satisfied, the charge and discharge cycle operation is stopped.

2. The battery charge and discharge test method according to claim 1, characterized in that: The step of obtaining battery parameters of the battery under test during the charge and discharge cycle operation includes: After the charge and discharge cycle operation is completed and the device is left to stand for a preset time, the static AC internal resistance is obtained.

3. The battery charge and discharge test method according to claim 2, characterized in that: The real-time internal resistance threshold is determined based on the initial AC internal resistance of the battery to be tested, the current cycle number and the preset time length.

4. The battery charge and discharge test method according to claim 3, characterized in that: The real-time internal resistance threshold satisfies the following relationship: Among them, R th (N, t) represents the real-time internal resistance threshold, N represents the current cycle number, t represents the preset duration, R0 represents the initial AC internal resistance, and α and β represent constant parameters determined based on the battery to be tested.

5. The battery charge and discharge test method according to claim 1, characterized in that: The preset capacity threshold is determined based on the average battery capacity of the previous N charge and discharge cycles and a preset battery health lower limit of the battery to be tested.

6. The battery charge and discharge test method according to claim 5, characterized in that: The lower limit of the battery health is in the interval (70%, 80%).

7. The battery charge and discharge test method according to claim 1, characterized in that: The step of obtaining battery parameters of the battery under test during the charge and discharge cycle operation includes: When the current cycle number of the battery to be tested is greater than the preset cycle number, battery parameters of the battery to be tested when performing the charge and discharge cycle operation are obtained.

8. The battery charge and discharge test method according to claim 1, characterized in that: Also includes: Obtaining operating parameters of the battery under test during a charge-discharge cycle operation, wherein the operating parameters include at least one of temperature, voltage, current, charge-discharge time, and temperature change rate; When the operating parameters do not meet the preset charge and discharge cycle conditions, the charge and discharge cycle operation is stopped.

9. A battery test cabinet, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the battery charge and discharge test method according to any one of claims 1 to 8 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the battery charge and discharge testing method according to any one of claims 1 to 8 is implemented.

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