Single battery working condition cycle test method, system and device based on SOC adjustment
By combining the A-time Integration method and the SOC-OCV curve model, the SOC status of a single cell is accurately adjusted, which solves the problem of large SOC deviation in the working condition test of a single cell, improves the test accuracy and life, and is suitable for single cells for racing cars.
Patent Information
- Application Number
- CN202510504657.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-07-08
AI Technical Summary
In the prior art, in the working condition test of single-cell batteries, the SOC adjustment deviation is large, resulting in inaccurate SOC estimates, affecting the execution of the working condition test, especially in high-magnification pulse tests that cannot be completed normally.
A model based on the A-time integral method and the SOC-OCV curve is adopted. By obtaining the SOC-OCV correspondence data table, the initial SOC is adjusted to the target SOC, the capacity change value is recorded, and the SOC is initially adjusted and checked until the difference in the OCV value is met within a reasonable range, and the test is cycled until the preset number is reached.
It improves the accuracy and life of the working condition test of single-cell batteries, meets the performance requirements of single-cell batteries for racing cars, and solves the problem that SOC deviation affects SOC prediction.
Smart Images
Figure CN120275846A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of single cell testing, and particularly relates to a method, system and device for single cell operating condition cycle testing based on SOC adjustment. Background Art
[0002] During the current execution of the operating condition test of a single cell, SOC adjustment is involved. For example, in a certain customer's method, it is required to test the operating condition cycles at 85% SOC, 81% SOC, and 64% SOC, and the operating condition cycle is run 24 times at each SOC state; the current sampling test process is to obtain the change in the battery capacity value through the charge-discharge current integration method, and then eliminate the change in capacity through constant current charge-discharge to maintain the SOC of the battery. However, the deviation of the estimated capacity of the battery cell directly using the ampere-hour integration method is large, and the time deviation of adjusting the SOC estimated by the ampere-hour integration method after the current is set is large, resulting in too large a deviation of the estimated SOC, which affects the execution of the operating condition test.
[0003] When carrying out the operating condition cycle test for a racing lithium-ion battery, high-rate pulse test requirements will be encountered. The method requires a short pulse time, a large number of charge-discharge times in the operating condition test, and too large a deviation in adjusting the SOC directly affects the SOC estimation of the battery, resulting in the inability to complete the operating condition test verification process normally. Summary of the Invention
[0004] In view of the deficiencies of the prior art, the present invention discloses a method, system and device for single cell operating condition cycle testing based on SOC adjustment.
[0005] A method for single cell operating condition cycle testing based on SOC adjustment includes the following steps:
[0006] Obtain the SOC-OCV correspondence data table of the single cell;
[0007] Adjust the initial SOC of the single cell to the target SOC, and perform an operating condition cycle test based on the target SOC. The operating condition cycle test includes:
[0008] Perform an operating condition test on the single cell based on the target SOC, and record the capacity change value generated during the operating condition test;
[0009] Based on the capacity change value, preliminarily adjust the SOC of the single cell to obtain the initially adjusted SOC value;
[0010] Based on the SOC-OCV correspondence data table, check the OCV value corresponding to the initially adjusted SOC value, and adjust the SOC according to the check result;
[0011] After the SOC adjustment, perform the operating condition cycle test again, and update the cycle number counter;
[0012] When the number of cycles reaches the preset number of cycles N, the cycle test of the single cell under working conditions is completed.
[0013] As an implementable manner, the obtaining of the SOC-OCV correspondence data table of the single cell includes the following steps:
[0014] The single cell is charged and discharged in cycles according to a specified current. After the SOC is adjusted, the single cell is left static for M seconds, and its corresponding OCV is recorded.
[0015] According to the SOC and the corresponding OCV values required for the cycle test of the single cell, a SOC-OCV model database is established.
[0016] According to the SOC-OCV model database, a SOC-OCV correspondence data table is established.
[0017] As an implementable manner, the adjustment of the initial SOC of the single cell to the target SOC includes the following steps:
[0018] Using the ampere-hour integration method, the initial SOC of the single cell is adjusted to the target SOC.
[0019] The ampere-hour integration method is expressed as:
[0020]
[0021] Wherein, represents the target SoC value of the single cell, represents the initial SOC value of the single cell, represents the charge and discharge current of the single cell, represents the charge and discharge time of the single cell, represents the maximum capacity of the single cell.
[0022] As an implementable manner, the working condition test is carried out on the single cell based on the target SOC, and the capacity change value generated during the working condition test is recorded, including the following steps:
[0023] According to the SOC-OCV model database, the SOC value of the single cell is initialized, and the working condition test of the single cell is executed. The working condition test includes several small working condition tests.
[0024] After each small working condition test is completed, the capacity change value generated in each charge and discharge step during the working condition test is recorded.
[0025] The capacity change value generated by the single cell during the cumulative working condition test is accumulated.
[0026] As an implementable manner, the accumulation of the capacity change value generated by the single cell during the working condition test includes the following steps:
[0027] Automatically obtained through the software of the charge and discharge device. Using the ampere-hour integration method, the current and time of each step are integrated. The charging is positive and the discharging is negative. The capacity change of the single battery is obtained through cumulative calculation.
[0028] The calculation formula for the capacity change of the single battery is:
[0029]
[0030] Among them, represents the charging current value of the single battery, represents the discharging current value of the single battery, represents the charging and discharging time of the single battery.
[0031] As an implementable manner, based on the capacity change value generated in the working condition test, the SOC of the single battery is initially adjusted to obtain the initial SOC value, including the following steps:
[0032] After the working condition test, based on the capacity change value of the single battery generated by the working condition test, the high pulse current value of the single battery is used for constant current charging, and the battery SOC is adjusted through charge and discharge.
[0033] As an implementable manner, based on the SOC-OCV correspondence data table, the OCV value corresponding to the initial SOC value is checked, and the SOC is adjusted according to the check result, including the following steps:
[0034] After the initial adjustment of SOC is completed, the single battery is charged and discharged at a constant voltage until the voltage of the single battery approaches the open circuit state;
[0035] Based on the SOC-OCV correspondence data table, the initial OCV values corresponding to different initial SOC values are obtained;
[0036] The OCV values corresponding to different initial SOC values are used as the current OCV value, and a logical judgment rule is established;
[0037] According to the logical judgment rule, the current OCV value is checked, and the SOC is adjusted according to the check result.
[0038] As an implementable manner, the logical judgment rule includes:
[0039] If the absolute value of the difference between the current OCV value and the initial OCV value is less than 10 mv, it is judged that the battery basically meets the SOC requirement at this time, and the subsequent working condition cycle test is continued;
[0040] If the absolute value of the difference between the current OCV value and the initial OCV value is between 10 mv and 50 mv, the SOC of the battery is adjusted by charging and discharging at a current value of 0.5 to 1C of the single battery;
[0041] When the absolute value of the difference between the current OCV value and the initialized OCV value exceeds 50 mV, the SOC of the battery is adjusted by charging and discharging according to the current value of 1-2C of the single battery.
[0042] As an implementable manner, after the SOC is adjusted, the working condition cycle test is carried out again, and the cycle number counter is updated, including the following steps:
[0043] After the SOC adjustment is completed, after being left idle for H seconds, the working condition cycle test under the target SOC is executed again;
[0044] Update the cycle number counter and return to the cycle process to continue the cycle test.
[0045] A single battery working condition cycle test system based on SOC adjustment, including: a corresponding relationship data table acquisition module, a working condition cycle test initialization module, a capacity change value generation module, an SOC initial adjustment module, an SOC verification and adjustment module, a counter update module, and a test completion module.
[0046] The corresponding relationship data table acquisition module is used to acquire the SOC-OCV corresponding relationship data table of the single battery;
[0047] The working condition cycle test initialization module is used to adjust the initial SOC of the single battery to the target SOC and perform the working condition cycle test based on the target SOC. The working condition cycle test includes:
[0048] The capacity change value generation module is used to perform a working condition test on the single battery based on the target SOC and record the capacity change value generated during the working condition test;
[0049] The SOC initial adjustment module is used to initially adjust the SOC of the single battery to obtain an SOC initial adjustment value based on the capacity change value generated during the working condition test;
[0050] The SOC verification and adjustment module is used to verify the OCV value under the corresponding SOC initial adjustment value based on the SOC-OCV corresponding relationship data table and adjust the SOC according to the verification result;
[0051] The counter update module is used to perform the working condition cycle test again after the SOC is adjusted and update the cycle number counter;
[0052] The test completion module, when the cycle number reaches the preset cycle number N, completes the working condition cycle test of the single battery based on the target SOC.
[0053] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:
[0054] Obtain the SOC-OCV correspondence data table of the single cell;
[0055] Adjust the initial SOC of the single cell to the target SOC, and perform a working condition cycle test based on the target SOC. The working condition cycle test includes:
[0056] Perform a working condition test on the single cell based on the target SOC, and record the capacity change value generated during the working condition test;
[0057] Based on the capacity change value, initially adjust the SOC of the single cell to obtain the initially adjusted SOC value;
[0058] Based on the SOC-OCV correspondence data table, check the OCV value at the initially adjusted SOC value, and adjust the SOC according to the check result;
[0059] After the SOC is adjusted, perform the working condition cycle test again, and update the cycle count counter;
[0060] When the number of cycles reaches the preset number of cycles N, complete the working condition cycle test of the single cell.
[0061] A working condition cycle test device for a single cell based on SOC adjustment, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the following method is implemented:
[0062] Obtain the SOC-OCV correspondence data table of the single cell;
[0063] Adjust the initial SOC of the single cell to the target SOC, and perform a working condition cycle test based on the target SOC. The working condition cycle test includes:
[0064] Perform a working condition test on the single cell based on the target SOC, and record the capacity change value generated during the working condition test;
[0065] Based on the capacity change value, initially adjust the SOC of the single cell to obtain the initially adjusted SOC value;
[0066] Based on the SOC-OCV correspondence data table, check the OCV value at the initially adjusted SOC value, and adjust the SOC according to the check result;
[0067] After the SOC is adjusted, perform the working condition cycle test again, and update the cycle count counter;
[0068] When the number of cycles reaches the preset number of cycles N, complete the working condition cycle test of the single cell.
[0069] Due to the adoption of the above technical solutions, the present invention has significant technical effects:
[0070] 1. The technical solution of the present invention is based on a model combining the ampere-hour integration method and the SOC-OCV curve, and combines the initial adjustment and verification steps of SOC to better complete the working condition test of the single cell, greatly improving the accuracy of the working condition test of the single cell;
[0071] 2. The technical solution of the present invention adjusts the SOC state of the single cell according to the actual working state of the single cell to adapt to the working condition, meets the performance requirements of the single cell for the racing car, and improves the service life of the single cell under the off-condition at the same time;
[0072] 3. The technical solution of the present invention is applicable to single cells for racing cars, and solves the problem that the adjustment of SOC of single cells for racing cars has too large a deviation, which affects the SOC estimation of single cells. Description of the Drawings
[0073] The following drawings are examples of the specific implementation manners of the present application:
[0074] Figure 1 is a schematic flow chart of a method for testing the working condition cycle of a single cell based on SOC adjustment according to an embodiment of the present invention;
[0075] Figure 2 is a schematic diagram of the overall structure of a system for testing the working condition cycle of a single cell based on SOC adjustment according to an embodiment of the present invention;
[0076] Figure 3 is the SOC-OCV curve of the single cell according to an embodiment of the present invention;
[0077] Figure 4 is the power change curve of the original normal ampere-hour integration method and the ampere-hour integration method with SOC adjustment of the single cell according to an embodiment of the present invention. Specific Embodiments
[0078] The present invention will be further described below with reference to the drawings and embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.
[0079] Embodiment 1:
[0080] A method for testing the working condition cycle of a single cell based on SOC (State of Charge, SOC) adjustment, as Figure 1 shown, includes the following steps:
[0081] S100. Obtain the data table of the correspondence between the SOC-OCV (Open Circuit Voltage, OCV) of the single cell;
[0082] S200. Adjust the initial SOC of the single cell to the target SOC, and perform a working condition cycle test based on the target SOC. The working condition cycle test includes:
[0083] S210. Conduct a working condition test on the single cell based on the target SOC, and record the capacity change value generated during the working condition test;
[0084] S220. Based on the capacity change value, preliminarily adjust the SOC of the single cell to obtain the initially adjusted SOC value;
[0085] S230. Based on the SOC-OCV corresponding relationship data table, check the OCV value corresponding to the initially adjusted SOC value, and adjust the SOC according to the check result;
[0086] S240. After the SOC is adjusted, conduct a working condition cycle test again, and update the cycle number counter;
[0087] S300. When the number of cycles reaches the preset number of cycles N, complete the working condition cycle test of the single cell.
[0088] The present invention obtains the SOC-OCV corresponding relationship data table of the single cell; uses the ampere-hour integration method to adjust the initial SOC of the single cell to the target SOC; uses the SOC-adjusted ampere-hour integration method (i.e., the method based on the combination of the ampere-hour integration method and the SOC-OCV curve) to conduct a working condition cycle test based on the target SOC: conduct a working condition test on the single cell based on the target SOC, and record the capacity change value generated during the working condition test; based on the SOC-OCV corresponding relationship data table, check the OCV value under the initially adjusted SOC value, and adjust the SOC according to the check result; after the SOC is adjusted, conduct a working condition cycle test again, and update the cycle number counter; when the number of cycles reaches the preset number of cycles N, complete the working condition cycle test of the single cell.
[0089] In this embodiment, step S100 of obtaining the SOC-OCV corresponding relationship data table of the single cell specifically includes the following steps:
[0090] S110: By measuring the open circuit voltage (OCV) of the battery with a measurement accuracy of 0.001V, establish a dynamic SOC-OCV curve to reflect the actual working state of the battery in real time, and obtain the SOC-OCV curve of the single cell, as Figure 3 shown.
[0091] S120: Construct an SOC-OCV model database and an SOC-OCV corresponding relationship data table by combining the ampere-hour integration method with the SOC-OCV curve of the single cell for estimating the SOC of the single cell.
[0092] By performing ampere-hour integration on the single cell, the charge and discharge times and duration of the single cell are recorded. For example, assuming the rated capacity of the single cell is 2.5 Ah, the current for each charge and discharge is 5 A, and the duration is 1 / 20 hour. In this way, we can calculate the remaining capacity of the battery, that is, the state of charge (SOC) of the battery.
[0093] The ampere-hour integration method is expressed as:
[0094]
[0095] Where, represents the target SoC value of the single cell, represents the initial SOC value of the single cell, represents the charge and discharge current of the single cell, represents the charge and discharge time of the single cell, represents the maximum capacity of the single cell.
[0096] In this embodiment, in step S200, under high-rate working conditions, adjusting the SOC state of the battery specifically includes the following steps:
[0097] According to the ampere-hour integration method, adjust the initial SOC of the single cell to the target SOC.
[0098] The specific operation is as follows. Assume the initial SOC of the single cell is 80%, and the target SOC in this embodiment is 85%. According to the ampere-hour integration method in the working condition test, estimate the change amount ΔC of the capacity in the working condition test. Based on the change amount of the capacity, calculate according to a current of 5 A. When the change amount of the capacity in the working condition is positive, it is necessary to discharge to adjust the SOC to 85% SOC, and perform constant-current discharge using 5 A, where the discharge time t (t = |ΔC| / 5).
[0099] In this embodiment, step S210 performs a working condition cycle test based on the target SOC and records the capacity change value generated during the working condition test. In this embodiment, the target SOC is 85% and the number of cycles is 25 times. It specifically includes the following steps:
[0100] Before the test starts, initialize the SOC value of the single cell according to the SOC-OCV model database. In this embodiment, the target SOC is 85%. Execute the working condition test steps of the single cell, and perform the test according to the working conditions specified in the method. After each small working condition test is completed, record the capacity change value of the single cell accumulated in the working condition according to each charge and discharge change step in the working condition test. The capacity change value of the single cell is automatically obtained through the software of the charge and discharge device. The obtaining step is to integrate the current and time of each step using the ampere-hour integration method, with charging being positive and discharging being negative, and cumulatively calculate the capacity change value of the single cell.
[0101] The calculation formula for the change in the capacity of a single battery is as follows:
[0102]
[0103] Wherein, represents the charging current value of a single battery, represents the discharging current value of a single battery, represents the charging and discharging time of a single battery.
[0104] The initial SOC value of the battery is preliminarily estimated by measuring the open-circuit voltage (OCV) of the battery. This method is more accurate than the traditional method of estimating SOC only by current integration because there is a certain non-linear relationship between the open-circuit voltage and SOC. A relatively accurate SOC-OCV model can be established through experimental data, and the OCV data at different SOCs of the battery in this model will be used as a reference for subsequent SOC verification steps.
[0105] In this embodiment, step S220 preliminarily adjusts the SOC of the single battery based on the capacity change value to obtain the initially adjusted SOC value, which specifically includes the following steps:
[0106] After the working condition test, based on the capacity change value of the single battery generated by the working condition test, the SOC of the battery is adjusted by charging and discharging using the high pulse current value of the single battery. Constant current charging is performed according to the high pulse current value used by the single battery. According to the requirements of the capacity cut-off condition, charging and discharging are performed to the specified SOC value, and the initial adjustment of the SOC of the single battery is completed to obtain the initially adjusted SOC value. Using a high pulse current value for constant current charging or discharging depends on the positive or negative of the capacity change value. If the capacity change value is positive, discharging is performed to offset it. If the capacity change value is negative, charging is performed to make up for it, and the current value is generally 3C to 5C.
[0107] In this embodiment, step S230 checks the OCV value at the initially adjusted SOC value based on the SOC-OCV correspondence data table, and adjusts the SOC according to the check result, which specifically includes the following steps:
[0108] After the initial adjustment of the SOC is completed, constant voltage charging and discharging are performed on the single battery until the voltage of the single battery is close to the open-circuit state;
[0109] Obtain the initial OCV values corresponding to different initially adjusted SOC values based on the SOC-OCV correspondence data table;
[0110] Import the OCV values corresponding to different SOCs as the current OCV values into the software of the test equipment, and establish a logical judgment rule through the conditions in the software;
[0111] Check the current OCV value according to the described logic judgment rule, and adjust the SOC according to the check result.
[0112] The described logic judgment rule is as follows:
[0113] When the absolute value of the difference between the current OCV value and the initialized OCV value is less than 10 mV, it is judged that the battery basically meets the SOC requirement at this time, and the subsequent working condition cycle test is continued;
[0114] When the absolute value of the difference between the current OCV value and the initialized OCV value is between 10 mV and 50 mV, charge and discharge the battery according to a current value of 0.5 to 1 C to adjust the SOC of the battery;
[0115] When the absolute value of the difference between the current OCV value and the initialized OCV value exceeds 50 mV, adjust the voltage of the battery to the initialized OCV value according to a current value of 1 to 2 C.
[0116] Record the OCV value V1 of the battery in the resting state, initialize the data according to the SOC-OCV model database, and obtain the OCV data corresponding to 85% SOC as V2 = 3.814 V. The test equipment automatically determines the voltage difference, that is, V1 - V2. When the absolute value of the difference is between 10 mV and 50 mV, use a 2.5 A current to discharge / charge to adjust the voltage of the battery to 3.814 V.
[0117] When the recorded resting voltage value is lower than the OCV-SOC voltage value, use the charging and replenishing mode. When the voltage is higher than the OCV-SOC voltage value, use the constant current discharge mode until the voltage reaches the initialized voltage value.
[0118] After the SOC check is completed, perform the power working condition test and run the high-pulse power test of the actual battery application.
[0119] Compare the original ampere-hour integration method and the SOC-adjusted ampere-hour integration method, and their power changes are as Figure 4 shown. The data shows that after 62 cycles of the battery working condition using the original normal ampere-hour integration method, the battery decays to the end stage. Through the adjusted SOC ampere-hour integration method, the battery works for 165 cycles, completing the working condition cycle required by the test method, and greatly improving the off-condition life of the single battery.
[0120] The SOC-adjusted ampere-hour integration method can more accurately adjust the SOC state of the battery and meet the pulse power requirements of the cell working condition cycle.
[0121] In this embodiment, after the precise adjustment of the SOC described in step S240, the working condition cycle test is carried out again, and the cycle number counter is updated.
[0122] After completing the precise adjustment of the SOC, suspend for 300 s and then perform the 85% SOC power condition test again. Determine whether the cycle count counter reaches 25. If so, end the test; if not, return to step S210 of the loop process and continue the loop according to steps S210, S220, S230, and S240.
[0123] The technical solution of the present invention is based on a model that combines the ampere-hour integration method and the SOC-OCV curve, and combines the initial adjustment and verification steps of the SOC to better complete the condition test of the single battery, greatly improving the accuracy of the condition test of the single battery; the technical solution of the present invention adjusts the SOC state of the SOC adapted to the working condition according to the actual working state of the battery, meets the performance requirements of the single battery for the racing car, and at the same time improves the service life of the single battery under the relevant conditions. The technical solution of the present invention is applicable to single batteries for racing cars, and solves the problem that the adjustment of the SOC of single batteries for racing cars has too large a deviation, affecting the SOC estimation of single batteries.
[0124] Embodiment 2:
[0125] A single battery condition cycle test system based on SOC adjustment, as Figure 2 shown, includes: a correspondence data table acquisition module 100, a condition cycle test initialization module 200, a capacity change value generation module 300, an SOC initial adjustment module 400, an SOC verification adjustment module 500, a counter update module 600, and a test completion module 700.
[0126] The correspondence data table acquisition module 100 is used to acquire the SOC-OCV correspondence data table of the single battery.
[0127] The condition cycle test initialization module 200 is used to adjust the initial SOC of the single battery to the target SOC and perform a condition cycle test based on the target SOC. The condition cycle test includes:
[0128] The capacity change value generation module 300 is used to perform a condition test on the single battery based on the target SOC and record the capacity change value generated during the condition test.
[0129] The SOC initial adjustment module 400 is used to perform an initial adjustment on the SOC of the single battery based on the capacity change value generated during the condition test to obtain an initial SOC adjustment value.
[0130] The SOC verification adjustment module 500 is used to verify the OCV value corresponding to the initial SOC adjustment value based on the SOC-OCV correspondence data table and adjust the SOC according to the verification result.
[0131] The counter update module 600 is used to perform a condition cycle test again after the SOC adjustment and update the cycle count counter.
[0132] The test completion module 700 completes the cycling test of the single-cell working conditions based on the target SOC when the number of cycles reaches the preset number of cycles N.
[0133] All changes and modifications made without departing from the spirit and scope of the present invention, and all equivalent technical solutions also fall within the scope of the present invention.
[0134] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.
[0135] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, devices, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0136] The present invention is described with reference to the flowcharts and / or block diagrams of methods, terminal devices (systems), and computer program products according to the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing terminal devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing terminal devices generate means for realizing the specified functions in Figure 1 one or more of the flows Figure 1 or a plurality of flows and / or blocks
[0137] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including instruction means, and the instruction means realizes the specified functions in Figure 1 one or more of the flows Figure 1 or a plurality of flows and / or blocks
[0138] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable terminal device provide means for realizing the specified functions in the flowFigure 1 one process or multiple processes and / or boxes Figure 1 steps of functions specified in one box or multiple boxes.
[0139] It should be noted that:
[0140] "One embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in connection with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" that appear throughout the specification do not necessarily all refer to the same embodiment.
[0141] In addition, it should be noted that for the specific embodiments described in this specification, the shapes of their components, the names taken, etc. may be different. Any equivalent or simple changes made according to the structure, features and principles described in the inventive concept of the present invention are included within the protection scope of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the specific embodiments described or use similar ways to substitute as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, and they should all fall within the protection scope of the present invention.
Claims
1. A method for testing the working condition cycle of a single battery based on SOC adjustment, characterized in that, It includes the following steps: Obtain the SOC-OCV correspondence data table of the single cell; Adjust the initial SOC of the single cell to the target SOC, and perform a working condition cycle test based on the target SOC. The working condition cycle test includes: Perform a working condition test on the single cell based on the target SOC, and record the capacity change value generated during the working condition test; Based on the capacity change value, preliminarily adjust the SOC of the single cell to obtain the initial adjusted value of SOC; Based on the SOC-OCV correspondence data table, check the OCV value corresponding to the initial adjusted value of SOC, and adjust the SOC according to the check result; After the SOC is adjusted, perform the working condition cycle test again, and update the cycle number counter; When the cycle number reaches the preset cycle number N, complete the working condition cycle test of the single cell.
2. The method for testing the working condition cycle of a single battery based on SOC adjustment according to claim 1, wherein The obtaining of the SOC-OCV correspondence data table of the single cell includes the following steps: The single cell is charged and discharged cyclically according to the specified current. After the SOC is adjusted, the single cell is left standing for M seconds, and its corresponding OCV is recorded; Establish an SOC-OCV model database according to the SOC and the corresponding OCV values required for the working condition cycle of the single cell; Based on the SOC-OCV model database, establish an SOC-OCV correspondence data table.
3. The single-cell operating condition cycling test method based on SOC adjustment according to claim 1, wherein, The adjustment of the initial SOC of the single cell to the target SOC includes the following steps: Use the ampere-hour integration method to adjust the initial SOC of the single cell to the target SOC; The ampere-hour integration method is expressed as: ； Among them, represents the target SoC value of the single cell, represents the initial SOC value of the single cell, represents the charge and discharge current of the single cell, represents the charge and discharge time of the single cell, represents the maximum capacity of the single cell.
4. The method for testing the working condition cycle of a single battery based on SOC adjustment according to claim 2, wherein The performing of the working condition test on the single cell based on the target SOC and recording the capacity change value generated during the working condition test includes the following steps: Initialize the SOC value of the single cell according to the SOC-OCV model database, and perform the working condition test of the single cell. The working condition test includes several small working condition tests; After each small working condition test is completed, record the capacity change value generated in each charge and discharge step during the working condition test; Accumulate the capacity change value generated by the single cell during the working condition test.
5. According to the method for performing a working condition cycle test of a single cell based on SOC adjustment as described in claim 4, wherein The accumulation of the capacity change value generated by the single cell during the working condition test includes the following steps: Automatically obtain through the software of the charge and discharge device. Use the ampere-hour integration method to integrate the current and time of each step. The charging is positive and the discharging is negative. Obtain the capacity change of the single cell through cumulative calculation, The calculation formula for the capacity change of the single cell is: ； Among them, represents the charging current value of a single battery cell, represents the discharging current value of a single battery cell, represents the charging and discharging time of a single battery cell.
6. The method for testing the working condition cycle of a single battery based on SOC adjustment according to claim 1, characterized in that The preliminary adjustment of the SOC of the single cell based on the capacity change value generated during the working condition test to obtain the initial adjusted value of SOC includes the following steps: After the working condition test, based on the capacity change value of the single cell generated during the working condition test, use the high pulse current value of the single cell for constant current charging, and adjust the SOC of the battery through charge and discharge.
7. The method for testing the working condition cycle of a single battery based on SOC adjustment according to claim 1, wherein Based on the SOC-OCV correspondence data table, check the OCV value corresponding to the initial adjusted value of SOC, and adjust the SOC according to the check result, including the following steps: After the initial adjustment of SOC is completed, perform constant voltage charge and discharge on the single cell until the voltage of the single cell is close to the open circuit state; Obtain the initial OCV values corresponding to different initial SOC values based on the SOC-OCV correspondence data table; Take the OCV values corresponding to different initial SOC values as the current OCV values, and establish a logical judgment rule; Check the current OCV value according to the logical judgment rule, and adjust the SOC according to the check result.
8. The method for testing the working condition cycle of a single battery based on SOC adjustment according to claim 7, characterized in that, The logical judgment rule includes: When the absolute value of the difference between the current OCV value and the initial OCV value is less than 10 mV, it is judged that the battery basically meets the SOC requirement at this time, and continue with the subsequent working condition cycle test; When the absolute value of the difference between the current OCV value and the initial OCV value is between 10 mV and 50 mV, charge and discharge the battery at a current value of 0.5-1C for a single cell to adjust the SOC of the battery; When the absolute value of the difference between the current OCV value and the initial OCV value exceeds 50 mV, charge and discharge the battery at a current value of 1-2C for a single cell to adjust the SOC of the battery.
9. The method for cycle test of working conditions of a single cell based on SOC adjustment according to claim 1, characterized in that, After the SOC is adjusted, conduct the cycle test of working conditions again, and update the cycle count counter, including the following steps: After completing the SOC adjustment, wait for H seconds and then execute the cycle test of working conditions under the target SOC again; Update the cycle count counter, and return to the cycle process to continue the cycle test.
10. A single-cell working condition cycling test system based on SOC adjustment, characterized in that It includes: Correspondence data table acquisition module, working condition cycle test initialization module, capacity change value generation module, initial SOC adjustment module, SOC verification and adjustment module, counter update module, test completion module, The correspondence data table acquisition module is used to obtain the SOC-OCV correspondence data table of the single cell; The working condition cycle test initialization module is used to adjust the initial SOC of the single cell to the target SOC, and conduct the working condition cycle test based on the target SOC. The working condition cycle test includes: The capacity change value generation module is used to conduct a working condition test on the single cell based on the target SOC and record the capacity change value generated during the working condition test; The initial SOC adjustment module is used to initially adjust the SOC of the single cell based on the capacity change value generated during the working condition test to obtain the initial SOC value; The SOC verification and adjustment module is used to verify the OCV value under the corresponding initial SOC value based on the SOC-OCV correspondence data table, and adjust the SOC according to the verification result; The counter update module is used to conduct the working condition cycle test again after the SOC is adjusted, and update the cycle count counter; The test completion module, when the cycle count reaches the preset cycle count N, completes the cycle test of the working conditions of the single cell based on the target SOC.
11. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method according to any one of claims 1 to 9.
12. A single-cell working condition cycle test device based on SOC adjustment, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 9.