Battery charging and discharging rate determination method and device, equipment and storage medium

Abstract

The invention relates to a battery charge and discharge rate determination method, device and equipment and a storage medium. When the charge-discharge rate of the battery is determined, the target charge-discharge rate of the target battery is determined firstly, and the charge-discharge test is performed on the target battery based on the target charge-discharge rate; acquiring a battery temperature value of the target battery during the charge and discharge test; judging whether the battery temperature value exceeds a preset temperature threshold value or not; if not, increasing the value of the target charge-discharge rate according to a preset adjustment rule, and re-executing the charge-discharge test; if yes, taking the target charge-discharge rate as the maximum charge-discharge rate; visibly, the maximum charge-discharge rate can be determined by detecting the change condition of the battery temperature value of the charge-discharge test performed by the battery under different charge-discharge rates, the mode is simple and feasible, and the test result is accurate and reliable, so that the test time and the test cost are saved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, device, equipment and storage medium for determining a charge and discharge rate of a battery. Background Art

[0002] Lithium titanate battery is a lithium-ion secondary battery that uses lithium titanate as the negative electrode material of lithium-ion battery and the positive electrode is composed of conventional materials such as lithium manganese oxide and ternary materials. Lithium titanate battery has good safety performance, long cycle life, and can be charged and discharged at ultra-high rates. The maximum charge and discharge rate refers to the ratio of the maximum charge and discharge current that the battery can withstand under specific conditions to the rated capacity of the battery. At present, when determining the maximum charge and discharge rate of the battery, it is necessary to test the capacity retention rate of the battery at different charge and discharge rates, and evaluate the maximum charge and discharge rate of the battery based on the capacity retention rate. However, judging the maximum charge and discharge rate of the battery based on the capacity retention rate is relatively limited, and the maximum charge and discharge rate of the battery cannot be accurately determined.

[0003] Therefore, how to more accurately determine the maximum charge and discharge rate of a battery is a technical problem that those skilled in the art need to solve. Summary of the invention

[0004] The present application provides a method, device, equipment and storage medium for determining the charge and discharge rate of a battery to improve the accuracy of the maximum charge and discharge rate of the battery.

[0005] In a first aspect, the present application provides a method for determining a charge and discharge rate of a battery, comprising:

[0006] Determine the target charge and discharge rate of the target battery;

[0007] Performing a charge and discharge test on the target battery based on a target charge and discharge rate;

[0008] Acquiring a battery temperature value of the target battery when performing the charge and discharge test;

[0009] Determining whether the battery temperature value exceeds a predetermined temperature threshold;

[0010] If not, the target charge and discharge rate is adjusted higher according to a predetermined adjustment rule, and the charge and discharge test is performed again;

[0011] If so, the target charge-discharge rate is used as the maximum charge-discharge rate.

[0012] Optionally, before determining the target charge and discharge rate of the target battery, the method further includes:

[0013] Determining a first DC resistance value of the target battery before testing; accordingly, taking the target charge-discharge rate as the maximum charge-discharge rate includes:

[0014] Determining a second DC resistance value of the target battery after the test;

[0015] Determining whether a change rate between the first DC resistance value and the second DC resistance value exceeds a change rate threshold;

[0016] If not, the target charge-discharge rate is used as the maximum charge-discharge rate.

[0017] Optionally, before determining the first DC resistance value of the target battery before the test, the method further includes:

[0018] Determine the test temperature value of the current test;

[0019] The test environment temperature is adjusted to the test temperature value, and the step of determining the first DC resistance value of the target battery before the test is continued.

[0020] Optionally, performing a charge and discharge test on the target battery based on a target charge and discharge rate includes:

[0021] If the test type is a maximum charge rate test, then based on the target charge and discharge rate, the target battery is charged at a constant current and constant voltage to a charging upper limit voltage value;

[0022] If the test type is a maximum discharge rate test, the target battery is discharged at a constant current and constant voltage to a lower discharge limit voltage value based on the target charge and discharge rate.

[0023] Optionally, obtaining a battery temperature value of the target battery when performing the charge and discharge test includes:

[0024] When performing the charge and discharge test, battery temperature values ​​at different positions of the target battery are obtained.

[0025] Optionally, obtaining battery temperature values ​​at different positions of the target battery includes:

[0026] The battery temperature values ​​of the positive electrode column, the negative electrode column and the battery body of the target battery are obtained.

[0027] Optionally, determining whether the battery temperature value exceeds a predetermined temperature threshold includes:

[0028] It is determined whether, among the battery temperature values ​​at different positions of the target battery, at least one battery temperature value at the position exceeds a predetermined temperature threshold.

[0029] In a second aspect, the present application provides a device for determining a charge and discharge rate of a battery, comprising:

[0030] A first determination module, used to determine a target charge and discharge rate of a target battery;

[0031] A test module, configured to perform a charge and discharge test on the target battery based on a target charge and discharge rate;

[0032] An acquisition module, used for acquiring a battery temperature value of the target battery when performing the charge and discharge test;

[0033] A judging module, used to judge whether the battery temperature value exceeds a predetermined temperature threshold; if not, trigger the first adjusting module; if yes, trigger the determining module;

[0034] The first adjustment module is used to increase the value of the target charge and discharge rate according to a predetermined adjustment rule, and then re-trigger the test module to perform the charge and discharge test;

[0035] The determination module is used to use the target charge and discharge rate as the maximum charge and discharge rate.

[0036] In a third aspect, the present application provides an electronic device, including:

[0037] A processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of the above-mentioned charge and discharge rate determination method of the present application through the computer program.

[0038] In a fourth aspect, the present application provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the steps of the above-mentioned charge and discharge rate determination method of the present application.

[0039] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: when determining the charge and discharge rate of a battery, the present application first determines the target charge and discharge rate of the target battery, and performs a charge and discharge test on the target battery based on the target charge and discharge rate; obtains the battery temperature value of the target battery when performing the charge and discharge test; determines whether the battery temperature value exceeds a predetermined temperature threshold; if not, increases the value of the target charge and discharge rate according to a predetermined adjustment rule, and re-executes the charge and discharge test; if so, uses the target charge and discharge rate as the maximum charge and discharge rate; it can be seen that the present application can determine the maximum charge and discharge rate by detecting the change in the battery temperature value when the battery performs the charge and discharge test at different charge and discharge rates. This method is simple and feasible, and the test results are accurate and reliable, thereby saving test time and test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0043] Figure 1 A schematic flow chart of a method for determining a charge and discharge rate of a battery provided in an embodiment of the present application;

[0044] Figure 2 A schematic flow chart of another method for determining the charge and discharge rate of a battery provided in an embodiment of the present application;

[0045] Figure 3 A schematic flow chart of another method for determining the charge and discharge rate of a battery provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of the structure of a battery charge and discharge rate determination device provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] The embodiments of the present invention provide a method, device, equipment and storage medium for determining the charge and discharge rate of a battery, so as to improve the accuracy of the maximum charge and discharge rate of the battery.

[0051] See also Figure 1 , Figure 1 A schematic flow chart of a method for determining a charge and discharge rate of a battery provided in an embodiment of the present application, the method specifically comprises the following steps:

[0052] S101, determining a target charge and discharge rate of a target battery;

[0053] It should be noted that the charge and discharge rate refers to the current value required when the battery is charged to its rated capacity within a specified time, and the charge rate is generally represented by C. When testing the maximum charge and discharge rate in this embodiment, it is first necessary to determine the target charge and discharge rate. In the initial test, the target charge and discharge rate can be set to the initial charge and discharge rate, such as 1C. In the subsequent test process, the value of the target charge and discharge rate can be adjusted through S105. For example, before the test, the target charge and discharge rate is 1C, and after executing S105, the target charge and discharge rate is adjusted to 1.5C.

[0054] S102, performing a charge and discharge test on a target battery based on a target charge and discharge rate;

[0055] It should be noted that the test types in this embodiment include maximum charge rate test and maximum discharge rate test. If the test type is maximum charge rate test, the target battery is charged with constant current and constant voltage to the upper limit voltage value of charge based on the target charge and discharge rate; if the test type is maximum discharge rate test, the target battery is discharged with constant current and constant voltage to the lower limit voltage value of discharge based on the target charge and discharge rate.

[0056] That is to say, this embodiment needs to perform different test operations according to different test types. If the test type is the maximum charge rate test, the target charge and discharge rate is specifically the target charge rate. When performing the test operation, the target battery is charged to the upper limit voltage value Vmax with constant current and constant voltage based on the target charge rate. The maximum charge and discharge rate after the test is specifically the maximum charge rate, that is, the maximum rate of a single full charge of the battery. If the test type is the maximum discharge rate test, the target charge and discharge rate is specifically the target discharge rate. When performing the test operation, the target battery is discharged to the lower limit voltage value Vmin with constant current and constant voltage based on the target discharge rate. The maximum charge and discharge rate after the test is specifically the maximum discharge rate, that is, the maximum rate of a single full discharge of the battery.

[0057] S103, obtaining a battery temperature value of the target battery when performing a charge and discharge test;

[0058] In this embodiment, when the target battery performs the charge and discharge test, it is necessary to obtain the battery temperature value of the target battery so as to determine the maximum charge and discharge rate by detecting the temperature change of the battery. In this embodiment, when obtaining the battery temperature value of the target battery, the battery temperature value of the target battery can be periodically obtained according to a preset acquisition frequency, such as obtaining the battery temperature value every 1 second.

[0059] S104, determining whether the battery temperature value exceeds a predetermined temperature threshold;

[0060] If not, execute S105; if yes, execute S106;

[0061] S105, after increasing the value of the target charge and discharge rate according to a predetermined adjustment rule, re-performing the charge and discharge test;

[0062] S106: Taking the target charge-discharge rate as the maximum charge-discharge rate.

[0063] It should be noted that the predetermined temperature threshold in this embodiment can be the maximum operating temperature of the battery specified by the application end; if the battery temperature value is detected to exceed the predetermined temperature threshold under the target charge and discharge rate, then the target charge and discharge rate is increased, and the temperature of the target battery will be too high when charging and discharging, affecting the battery life and energy conversion efficiency. Therefore, in this embodiment, the target charge and discharge rate when the battery temperature value exceeds the predetermined temperature threshold is used as the maximum charge and discharge rate; if it is detected that the battery temperature value does not exceed the predetermined temperature threshold, the target charge and discharge rate is adjusted higher according to the predetermined adjustment rule, and S102 is re-executed to perform charge and discharge tests on the target battery until the battery temperature value exceeds the predetermined temperature threshold. Among them, the predetermined adjustment rule is a rule for adjusting the numerical value of the target charge and discharge rate, such as: the predetermined adjustment rule is: increase the numerical value of the target charge and discharge rate by 0.5C each time.

[0064] In summary, it can be seen that when determining the charge and discharge rate of a battery, the present application first determines the target charge and discharge rate of the target battery, and performs a charge and discharge test on the target battery based on the target charge and discharge rate; obtains the battery temperature value of the target battery when performing the charge and discharge test; determines whether the battery temperature value exceeds a predetermined temperature threshold; if not, adjusts the target charge and discharge rate higher according to a predetermined adjustment rule, and re-executes the charge and discharge test; if so, uses the target charge and discharge rate as the maximum charge and discharge rate; it can be seen that the present application can determine the maximum charge and discharge rate by detecting the change in the battery temperature value when the battery performs a charge and discharge test at different charge and discharge rates. This method is simple and feasible, and the test results are accurate and reliable, thereby saving test time and test costs.

[0065] See also Figure 2 , Figure 2A flow chart of another method for determining a charge and discharge rate of a battery provided in an embodiment of the present application, the method specifically comprises the following steps:

[0066] S201, determining a test temperature value of the current test, and adjusting the test environment temperature to the test temperature value;

[0067] S202, determining a first DC resistance value of the target battery before testing;

[0068] S203, determining a target charge and discharge rate of a target battery;

[0069] S204, performing a charge and discharge test on the target battery based on the target charge and discharge rate;

[0070] S205, obtaining a battery temperature value of the target battery when performing a charge and discharge test;

[0071] S206, determining whether the battery temperature value exceeds a predetermined temperature threshold;

[0072] If not, execute S207; if yes, execute S208;

[0073] S207, after increasing the value of the target charge and discharge rate according to a predetermined adjustment rule, re-performing the charge and discharge test;

[0074] S208, determining a second DC resistance value of the target battery after the test;

[0075] S209, determining whether the change rate of the first DC resistance value and the second DC resistance value exceeds a change rate threshold; if not, executing S210;

[0076] S210: Taking the target charge-discharge rate as the maximum charge-discharge rate.

[0077] It should be noted that, when determining the charge and discharge rate of the battery, the target battery can be placed in a temperature control box test cabinet for testing to determine the charge and discharge rate of the battery at different temperatures. Therefore, when testing, this solution first needs to determine the test temperature value, and adjust the ambient temperature in the temperature control box test cabinet to the test temperature value to determine the maximum charge and discharge rate of the target battery at the test temperature value; therefore, after executing S210, S201 can be re-executed to re-determine another test temperature value to determine the maximum charge and discharge rate of the target battery at another test temperature value. For example: set the test temperature value to 25°C, test the maximum charge and discharge rate of the target battery when the ambient temperature is 25°C, after the test, set the test temperature value to 30°C, test the maximum charge and discharge rate of the target battery when the ambient temperature is 30°C, and so on, the maximum charge and discharge rate at each temperature can be tested.

[0078] Furthermore, in order to improve the accuracy of the maximum charge and discharge rate, this embodiment needs to pass the HPPC (Hybrid Pulse Power Characteristic) test before and after the test to calculate the direct current internal resistance (DC-IR). In this embodiment, the direct current resistance value calculated before the test is called the first direct current resistance value, and the direct current resistance value after the test is called the second direct current resistance value. By comparing the change rate of the first direct current resistance value and the second direct current resistance value, it can be determined whether the battery can be charged at the target charge and discharge rate at the current test temperature value.

[0079] Specifically, when obtaining the first DC resistance value and the second DC resistance value, the present embodiment can calculate the target battery's charge and discharge DC-IR at 10% SOC (State of Charge), 50% SOC, and 90% SOC before the test, and calculate the target battery's charge and discharge DC-IR at 10% SOC, 50% SOC, and 90% SOC after the test. And the change rate threshold can be formulated into different indicators according to requirements. For example, in the present embodiment, the change rate threshold can be set to 10%, that is to say: if the change rate of the first DC resistance value and the second DC resistance value exceeds 10%, it means that the target battery is not feasible to charge at the current target charge and discharge rate, and the test is performed again; if it does not exceed 10%, it means that the target battery is feasible to charge at the current target charge and discharge rate, and the current target charge and discharge rate is used as the maximum charge and discharge rate.

[0080] In summary, this embodiment calculates the first DC resistance value through the HPPC test before executing the charge and discharge test, and calculates the second DC resistance value through the HPPC test after executing the charge and discharge test. The accuracy of the maximum charge and discharge rate can be further detected through the rate of change of the first DC resistance value and the second DC resistance value, thereby improving the reliability of the detection result. Moreover, this embodiment can determine the maximum charge and discharge rate of the target battery at different temperatures by setting the test temperature value of the current test, and then formulate a charge and discharge matrix table of the battery at different temperatures based on the result, thereby providing data support for the battery PACK-end application.

[0081] See also Figure 3 , Figure 3 A flow chart of a method for determining a charge and discharge rate of a battery provided in an embodiment of the present application is provided, and the method specifically comprises the following steps:

[0082] S301, determining a test temperature value of the current test, and adjusting the test environment temperature to the test temperature value;

[0083] S302, determining a first DC resistance value of the target battery before testing;

[0084] S303, determining a target charge and discharge rate of a target battery;

[0085] S304, performing a charge and discharge test on the target battery based on the target charge and discharge rate;

[0086] S305, obtaining battery temperature values ​​at different positions of the target battery when performing a charge and discharge test;

[0087] S306, determining whether, among the battery temperature values ​​at different positions of the target battery, the battery temperature value at at least one position exceeds a predetermined temperature threshold;

[0088] If not, execute S307; if yes, execute S308;

[0089] S307, after increasing the value of the target charge and discharge rate according to a predetermined adjustment rule, re-execute the charge and discharge test;

[0090] S308, determining a second DC resistance value of the target battery after the test;

[0091] S309, determining whether the change rate of the first DC resistance value and the second DC resistance value exceeds a change rate threshold; if not, executing S310;

[0092] S310: Taking the target charge-discharge rate as the maximum charge-discharge rate.

[0093] In this embodiment, when obtaining the battery temperature value of the target battery when performing a charge and discharge test, the battery temperature values ​​at different positions of the target battery can be obtained, and it can be determined whether there is at least one battery temperature value at different positions of the target battery that exceeds a predetermined temperature threshold, so as to more accurately detect the temperature change of the battery.

[0094] Specifically, when obtaining the battery temperature value, the present embodiment can obtain the battery temperature values ​​of the positive pole, the negative pole and the battery body of the target battery, that is, obtain three battery temperature values, namely, the positive pole temperature value, the negative pole temperature value and the battery body temperature value. When the target battery performs a charge and discharge test, it is necessary to obtain the positive pole temperature value, the negative pole temperature value and the battery body temperature value in real time, and determine whether any of the positive pole temperature value, the negative pole temperature value and the battery body temperature value exceeds a predetermined temperature threshold. If any of the temperature values ​​exceeds the predetermined temperature threshold, execute S308.

[0095] This embodiment provides a specific embodiment to illustrate the specific determination method of the maximum charge rate and the maximum discharge rate respectively:

[0096] 1. Determination process of the maximum rate of full charge of the battery:

[0097] Before testing, first select any temperature within the operating temperature range specified in the battery specification for testing. The selected temperature is the test temperature value. The specific measurement process is as follows:

[0098] 1.1. Before the rate charge test, the battery is first subjected to HPPC test (25°C) in a temperature control box test cabinet, and the charge and discharge DC-IR at 10% SOC, 50% SOC, and 90% SOC are calculated respectively.

[0099] 1.2. Use a thermometer to monitor the temperature rise of the positive and negative poles and the battery body, respectively, and record them as TC1, TC2, and TC3. Place the battery in a temperature control box test cabinet until the temperatures read at the three temperature monitoring points are all within the range of ±2°C of the set temperature of the temperature control box.

[0100] 1.3. Start the test, starting with a 1C charging rate, and charge the battery with constant current and constant voltage to the charging upper limit voltage Vmax specified in the specification. During the charging process, check TC1, TC2, and TC3 to confirm whether one of the three exceeds Tmax. If the temperature of one of the three reaches Tmax, stop the test. The charging rate at this time is the maximum rate of a single full charge of the battery at this temperature.

[0101] 1.4. If the temperatures of TC1, TC2, and TC3 are all lower than Tmax, increase the charging rate by another 0.5C and continue the charging test until the temperature of one of the three reaches Tmax, then stop the test.

[0102] 1.5. After the test, the battery is subjected to HPPC test to calculate the charge and discharge DC-IR at 10% SOC, 50% SOC, and 90% SOC.

[0103] 1.6. Compare the charge and discharge DC-IR before and after the rate charge test. If the change rate is less than 10%, it means that the battery can be charged at this temperature and rate.

[0104] 1.7. Select another temperature from the operating temperature range specified in the battery specification as the test temperature value of the battery, and re-execute 1.1-1.6 to obtain the maximum charge rate at different temperatures.

[0105] 2. Determination process of the maximum rate of battery full discharge:

[0106] Before testing, first select any temperature within the operating temperature range specified in the battery specification for testing. The selected temperature is the test temperature value. The specific measurement process is as follows:

[0107] 2.1. Before the rate discharge test, the battery is first subjected to HPPC test (25°C) in a temperature control box test cabinet, and the charge and discharge DC-IR at 10% SOC, 50% SOC, and 90% SOC are calculated respectively.

[0108] 2.2. Use a thermometer to monitor the temperature rise of the positive and negative poles and the battery body, which are recorded as TC1, TC2, and TC3 respectively. Place the battery in a temperature control box test cabinet until the temperatures read at the three temperature monitoring points are within ±2°C of the temperature control box set temperature.

[0109] 2.3. Start the test, starting with a 1C discharge rate, and discharge the battery at a constant current and constant voltage to the lower discharge voltage Vmin specified in the specification. During the discharge process, check TC1, TC2, and TC3 to confirm whether one of the three is greater than Tmax. If the temperature of one of the three reaches Tmax, stop the test. The discharge rate at this time is the maximum rate of a single full discharge of the battery.

[0110] 2.4. If the temperatures of TC1, TC2 and TC3 are all lower than Tmax, increase the discharge rate by 0.5C and continue the discharge test until the temperature of one of the three reaches Tmax, then stop the test.

[0111] 2.5. After the test, the battery is subjected to HPPC test to calculate the charge and discharge DC-IR at 10% SOC, 50% SOC, and 90% SOC.

[0112] 2.6. Compare the charge and discharge DC-IR before and after the rate discharge test. If the change rate is less than 10%, it means that the battery can be discharged at this temperature and rate.

[0113] 2.7. Select another temperature from the operating temperature range specified in the battery specification as the test temperature value of the battery, and re-execute 2.1-2.6 to obtain the maximum discharge rate at different temperatures.

[0114] In summary, this embodiment provides a method for evaluating the maximum charge and discharge rate of a lithium titanate battery. Any temperature within the operating temperature range specified in the battery specification can be selected for testing. By testing different rates in a constant temperature test cabinet and monitoring the temperature changes of the battery before and after the rate charge and discharge and the DC-IR changes under different SOCs, the maximum rate of a single full charge or discharge of the battery is determined. This test method can accurately evaluate the maximum charge and discharge rate of a lithium titanate battery, and can save test time and test costs when evaluating the maximum charge and discharge rate of the battery.

[0115] See also Figure 4 , Figure 4 A schematic diagram of the structure of a battery charge and discharge rate determination device provided in an embodiment of the present application, the device specifically comprises:

[0116] A first determination module 11 is used to determine a target charge and discharge rate of a target battery;

[0117] A test module 12, configured to perform a charge and discharge test on the target battery based on a target charge and discharge rate;

[0118] An acquisition module 13, used to acquire a battery temperature value of the target battery when performing the charge and discharge test;

[0119] The judging module 14 is used to judge whether the battery temperature value exceeds a predetermined temperature threshold; if not, the first adjusting module 15 is triggered; if yes, the determining module 16 is triggered;

[0120] The first adjustment module 15 is used to increase the value of the target charge and discharge rate according to a predetermined adjustment rule, and then re-trigger the test module to perform the charge and discharge test;

[0121] The determination module 16 is configured to use the target charge-discharge rate as the maximum charge-discharge rate.

[0122] As an optional embodiment, the device further includes:

[0123] A second determination module, used to determine a first DC resistance value of the target battery before testing before determining a target charge and discharge rate of the target battery;

[0124] Accordingly, the determination module specifically includes:

[0125] a determining unit, configured to determine a second DC resistance value of the target battery after the test;

[0126] a determination unit, configured to determine whether a change rate between the first DC resistance value and the second DC resistance value exceeds a change rate threshold; if not, triggering the determination unit;

[0127] The determination unit is used to use the target charge and discharge rate as the maximum charge and discharge rate.

[0128] As an optional embodiment, the device further includes:

[0129] A third determination module, configured to determine a test temperature value of a current test before determining a first DC resistance value of the target battery before the test;

[0130] The second adjustment module is used to adjust the test environment temperature to the test temperature value, and continue to execute the step of determining the first DC resistance value of the target battery before the test.

[0131] As an optional embodiment, the test module includes:

[0132] A first test unit is used to charge the target battery to a charging upper limit voltage value at a constant current and constant voltage based on the target charge and discharge rate when the test type is a maximum charge rate test;

[0133] The second test unit is used to discharge the target battery at a constant current and constant voltage to a lower discharge limit voltage value based on the target charge and discharge rate when the test type is a maximum discharge rate test.

[0134] As an optional embodiment, the acquisition module is specifically used to: acquire battery temperature values ​​at different positions of the target battery when performing the charge and discharge test.

[0135] As an optional embodiment, the acquisition module is specifically used to: acquire the battery temperature values ​​of the positive electrode column, the negative electrode column and the battery body of the target battery.

[0136] As an optional embodiment, the judgment module is specifically used to: judge whether, among the battery temperature values ​​at different positions of the target battery, there is at least one battery temperature value at a position exceeding a predetermined temperature threshold.

[0137] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0138] See also Figure 5 , Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application, the electronic device specifically includes:

[0139] The processor 21, the memory 22 and the computer program stored in the memory 22 and executable on the processor 21, the processor 21 executes the steps of the method for determining the charge and discharge rate described in any of the above method embodiments through the computer program.

[0140] Among them, the processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 21 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 21 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0141] The memory 22 may include one or more computer-readable storage media, which may be non-transitory. The memory 22 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In this embodiment, the memory 22 is at least used to store the following computer program 221, wherein, after the computer program is loaded and executed by the processor 21, it can implement the relevant steps in the charge and discharge rate determination method disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory 22 may also include an operating system 222 and data 223, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 222 may include Windows, Unix, Linux, etc.

[0142] In some embodiments, the electronic device may further include a display screen 23 , an input / output interface 24 , a communication interface 25 , a sensor 26 , a power source 27 , and a communication bus 28 .

[0143] certainly, Figure 5 The structure of the electronic device shown does not constitute a limitation on the electronic device in the embodiments of the present application. In actual applications, the electronic device may include Figure 5 More or fewer components than shown, or combinations of certain components.

[0144] In another exemplary embodiment, a computer storage medium is also provided, and when the program instructions are executed by the processor, the steps of the charge and discharge rate determination method described in any of the above method embodiments are implemented. The storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0145] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0146] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0147] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for determining a charge and discharge rate of a battery, characterized in that: include: Determine the target charge and discharge rate of the target battery; Performing a charge and discharge test on the target battery based on a target charge and discharge rate; Acquiring a battery temperature value of the target battery when performing the charge and discharge test; Determining whether the battery temperature value exceeds a predetermined temperature threshold; If not, the target charge and discharge rate is adjusted higher according to a predetermined adjustment rule, and the charge and discharge test is performed again; If so, the target charge-discharge rate is used as the maximum charge-discharge rate.

2. The method for determining the charge and discharge rate according to claim 1, characterized in that: Before determining the target charge and discharge rate of the target battery, the method further includes: Determining a first DC resistance value of the target battery before testing; accordingly, taking the target charge-discharge rate as the maximum charge-discharge rate includes: Determining a second DC resistance value of the target battery after the test; Determining whether a change rate between the first DC resistance value and the second DC resistance value exceeds a change rate threshold; If not, the target charge-discharge rate is used as the maximum charge-discharge rate.

3. The method for determining the charge and discharge rate according to claim 2, characterized in that: Before determining the first DC resistance value of the target battery before the test, the method further includes: Determine the test temperature value of the current test; The test environment temperature is adjusted to the test temperature value, and the step of determining the first DC resistance value of the target battery before the test is continued.

4. The method for determining the charge and discharge rate according to claim 1, characterized in that: The performing a charge and discharge test on the target battery based on the target charge and discharge rate includes: If the test type is a maximum charge rate test, then based on the target charge and discharge rate, the target battery is charged at a constant current and constant voltage to a charging upper limit voltage value; If the test type is a maximum discharge rate test, the target battery is discharged at a constant current and constant voltage to a discharge lower limit voltage value based on the target charge and discharge rate.

5. The method for determining the charge and discharge rate according to any one of claims 1 to 4, characterized in that: The obtaining of the battery temperature value of the target battery when performing the charge and discharge test includes: When performing the charge and discharge test, battery temperature values ​​at different positions of the target battery are obtained.

6. The method for determining the charge and discharge rate according to claim 5, characterized in that: The obtaining of battery temperature values ​​at different positions of the target battery includes: The battery temperature values ​​of the positive electrode column, the negative electrode column and the battery body of the target battery are obtained.

7. The method for determining the charge and discharge rate according to claim 5, characterized in that: The determining whether the battery temperature value exceeds a predetermined temperature threshold comprises: It is determined whether, among the battery temperature values ​​at different positions of the target battery, at least one battery temperature value at the position exceeds a predetermined temperature threshold.

8. A device for determining a battery charge and discharge rate, characterized in that: include: A first determination module, used to determine a target charge and discharge rate of a target battery; A test module, configured to perform a charge and discharge test on the target battery based on a target charge and discharge rate; An acquisition module, used for acquiring a battery temperature value of the target battery when performing the charge and discharge test; A judging module, used to judge whether the battery temperature value exceeds a predetermined temperature threshold; if not, trigger the first adjusting module; if yes, trigger the determining module; The first adjustment module is used to increase the value of the target charge and discharge rate according to a predetermined adjustment rule, and then re-trigger the test module to perform the charge and discharge test; The determination module is used to use the target charge and discharge rate as the maximum charge and discharge rate.

9. An electronic device, characterized in that: include: A processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of the method for determining the charge and discharge rate as described in any one of claims 1 to 7 of the present application through the computer program.

10. A computer storage medium, characterized in that: The computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the steps of the charge and discharge rate determination method described in any one of claims 1 to 7 of the present application.

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