Battery charging and discharging voltage curve reconstruction method, device, system and storage medium

Abstract

This invention discloses a method, apparatus, system, and storage medium for reconstructing battery charge-discharge voltage curves. The method includes: acquiring the charge-discharge voltage curve of a calibration battery corresponding to the battery under test and the current charge-discharge voltage curve of the battery under test; determining a reconstructed charging voltage curve based on the standard charging time corresponding to the calibration battery's charge-discharge voltage curve and the current charge-discharge voltage curve; determining an instantaneous voltage drop curve and an instantaneous voltage drop based on the reconstructed charging voltage curve, and determining a reconstructed discharge voltage curve based on the current charge-discharge voltage curve and the instantaneous voltage drop; and obtaining the reconstructed charge-discharge voltage curve of the battery under test based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharge voltage curve. This invention obtains the reconstructed charge-discharge voltage curve by using the calibration battery's charge-discharge voltage curve and the current charge-discharge voltage curve, achieving comparability between the calibration battery and individual battery cells, facilitating anomaly detection of individual battery cells.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method, apparatus, system, and storage medium for reconstructing battery charge and discharge voltage curves. Background Technology

[0002] The safety of lithium-ion batteries has always been a concern for both academia and industry. The safety of lithium-ion batteries is closely related to the personal and property safety of consumers. Current methods for detecting anomalies in lithium batteries primarily focus on reconstructing battery charge-discharge voltage curves for battery packs. Since the charge-discharge times of individual cells within a battery pack are consistent and possess a value of uniformity, an averaging method can be used to determine the corresponding calibration cell for each cell in the pack. Comparing the calibration cell with the cell under test in the pack can effectively detect anomalies. However, existing battery charge-discharge voltage curve reconstruction methods cannot be used for anomaly detection of individual cells outside the battery pack. This is because different cells are not correlated, and their charge-discharge times differ, especially when an anomaly occurs in a cell, making the differences in charge-discharge times more pronounced. Therefore, it is impossible to effectively determine the calibration cell for a cell or effectively compare the calibration cell with the cell, hindering effective anomaly detection for individual cells.

[0003] Therefore, how to achieve comparability between calibrated batteries and individual battery cells, and facilitate anomaly detection of individual battery cells, is an urgent problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to propose a method, apparatus, system, and storage medium for reconstructing battery charge and discharge voltage curves, aiming to solve the problem of how to achieve comparability between calibrated batteries and individual battery cells, and to facilitate anomaly detection of individual battery cells.

[0005] To achieve the above objectives, the present invention provides a method for reconstructing a battery charge-discharge voltage curve, the method comprising the following steps:

[0006] Obtain the calibration battery charge / discharge voltage curve corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test;

[0007] Based on the standard charging time corresponding to the calibrated battery charge-discharge voltage curve and the current charge-discharge voltage curve, a reconstructed charging voltage curve is determined;

[0008] The instantaneous voltage drop curve and instantaneous voltage drop are determined based on the reconstructed charging voltage curve, and the reconstructed discharging voltage curve is determined based on the current charging and discharging voltage curve and the instantaneous voltage drop.

[0009] Based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharging voltage curve, the reconstructed charging and discharging voltage curve of the battery under test is obtained.

[0010] Optionally, the steps of obtaining the calibration battery charge-discharge voltage curve corresponding to the battery under test and the current charge-discharge voltage curve of the battery under test include:

[0011] Obtain the battery type corresponding to the battery to be tested, and determine the calibration battery based on the battery type;

[0012] According to the preset sampling time, the first charge and discharge voltage data corresponding to the calibration battery is obtained, and the charge and discharge voltage curve of the calibration battery is determined according to the first charge and discharge voltage data.

[0013] According to the preset sampling time, the second charge and discharge voltage data corresponding to the battery under test is obtained, and the current charge and discharge voltage curve of the battery under test is determined according to the second charge and discharge voltage data.

[0014] Optionally, the step of determining the reconstructed charging voltage curve based on the standard charging time corresponding to the calibrated battery charging and discharging voltage curve and the current charging and discharging voltage curve includes:

[0015] Obtain the standard charging duration corresponding to the calibrated battery charge-discharge voltage curve, and determine the charging voltage curve segment in the current charge-discharge voltage curve;

[0016] Obtain the charging start time of the charging voltage curve segment, and take the charging start time as the starting point to extract a curve segment with a length equal to the standard charging time from the charging voltage curve segment to obtain the reconstructed charging voltage curve.

[0017] Optionally, the step of determining the instantaneous voltage drop curve and the instantaneous voltage drop based on the reconstructed charging voltage curve includes:

[0018] Calculate the internal resistance of the battery under test and obtain the corresponding charging end current in the reconstructed charging voltage curve;

[0019] The instantaneous voltage drop is calculated based on the internal resistance value and the charging end current.

[0020] Obtain the charging terminal voltage corresponding to the reconstructed charging voltage curve, and determine the instantaneous voltage drop curve based on the charging terminal voltage and the instantaneous voltage drop.

[0021] Optionally, the step of determining the instantaneous voltage drop curve based on the charging terminal voltage and the instantaneous voltage drop includes:

[0022] Obtain the battery type and operating condition information of the battery under test, and determine the time for the battery under test to complete the instantaneous voltage drop based on the battery type and the operating condition information;

[0023] The instantaneous voltage drop curve is determined based on the charging end voltage, the instantaneous voltage drop, and the time to complete the instantaneous voltage drop.

[0024] Optionally, the step of determining the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the instantaneous voltage drop includes:

[0025] Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and calculate the discharge start voltage calibration value based on the charging end voltage and the instantaneous voltage drop.

[0026] The reconstructed discharge voltage curve is determined based on the current charge / discharge voltage curve and the discharge head voltage calibration value.

[0027] Optionally, the step of determining the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the discharge head voltage calibration value includes:

[0028] Extract a segment of the discharge voltage curve from the current charge / discharge voltage curve, and obtain the discharge voltage value of the segment in sequence according to the time order of the discharge voltage curve segment;

[0029] The discharge voltage value is compared with the discharge start-up voltage calibration value to determine the discharge start-up voltage;

[0030] A segment of the discharge voltage curve, starting from the discharge head voltage, is extracted to obtain the reconstructed discharge voltage curve.

[0031] Optionally, the step of obtaining the reconstructed charge-discharge voltage curve of the battery under test based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharging voltage curve includes:

[0032] The end of the reconstructed charging voltage curve is spliced ​​with the beginning of the instantaneous voltage drop curve, and the end of the instantaneous voltage drop curve is spliced ​​with the beginning of the reconstructed discharging voltage curve to obtain the reconstructed charging and discharging voltage curve of the battery under test.

[0033] Furthermore, to achieve the above objectives, the present invention also provides a battery charge-discharge voltage curve reconstruction device, the battery charge-discharge voltage curve reconstruction device comprising:

[0034] The acquisition module is used to acquire the calibration battery charge-discharge voltage curve corresponding to the battery under test and the current charge-discharge voltage curve of the battery under test;

[0035] The first determining module is used to determine the reconstructed charging voltage curve based on the standard charging time corresponding to the calibrated battery charging and discharging voltage curve and the current charging and discharging voltage curve.

[0036] The second determining module is used to determine the instantaneous voltage drop curve and instantaneous voltage drop based on the reconstructed charging voltage curve, and to determine the reconstructed discharging voltage curve based on the current charging and discharging voltage curve and the instantaneous voltage drop.

[0037] The reconstruction module is used to obtain the reconstructed charge and discharge voltage curve of the battery under test based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharge voltage curve.

[0038] Furthermore, the acquisition module is also used for:

[0039] Obtain the battery type corresponding to the battery to be tested, and determine the calibration battery based on the battery type;

[0040] According to the preset sampling time, the first charge and discharge voltage data corresponding to the calibration battery is obtained, and the charge and discharge voltage curve of the calibration battery is determined according to the first charge and discharge voltage data.

[0041] According to the preset sampling time, the second charge and discharge voltage data corresponding to the battery under test is obtained, and the current charge and discharge voltage curve of the battery under test is determined according to the second charge and discharge voltage data.

[0042] Furthermore, the first determining module is also used for:

[0043] Obtain the standard charging duration corresponding to the calibrated battery charge-discharge voltage curve, and determine the charging voltage curve segment in the current charge-discharge voltage curve;

[0044] Obtain the charging start time of the charging voltage curve segment, and take the charging start time as the starting point to extract a curve segment with a length equal to the standard charging time from the charging voltage curve segment to obtain the reconstructed charging voltage curve.

[0045] Furthermore, the second determining module is also used for:

[0046] Calculate the internal resistance of the battery under test and obtain the corresponding charging end current in the reconstructed charging voltage curve;

[0047] The instantaneous voltage drop is calculated based on the internal resistance value and the charging end current.

[0048] Obtain the charging terminal voltage corresponding to the reconstructed charging voltage curve, and determine the instantaneous voltage drop curve based on the charging terminal voltage and the instantaneous voltage drop.

[0049] Furthermore, the second determining module is also used for:

[0050] Obtain the battery type and operating condition information of the battery under test, and determine the time for the battery under test to complete the instantaneous voltage drop based on the battery type and the operating condition information;

[0051] The instantaneous voltage drop curve is determined based on the charging end voltage, the instantaneous voltage drop, and the time to complete the instantaneous voltage drop.

[0052] Furthermore, the second determining module is also used for:

[0053] Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and calculate the discharge start voltage calibration value based on the charging end voltage and the instantaneous voltage drop.

[0054] The reconstructed discharge voltage curve is determined based on the current charge / discharge voltage curve and the discharge head voltage calibration value.

[0055] Furthermore, the second determining module is also used for:

[0056] Extract a segment of the discharge voltage curve from the current charge / discharge voltage curve, and obtain the discharge voltage value of the segment in sequence according to the time order of the discharge voltage curve segment;

[0057] The discharge voltage value is compared with the discharge start-up voltage calibration value to determine the discharge start-up voltage;

[0058] A segment of the discharge voltage curve, starting from the discharge head voltage, is extracted to obtain the reconstructed discharge voltage curve.

[0059] Furthermore, the reconstruction module is also used for:

[0060] The end of the reconstructed charging voltage curve is spliced ​​with the beginning of the instantaneous voltage drop curve, and the end of the instantaneous voltage drop curve is spliced ​​with the beginning of the reconstructed discharging voltage curve to obtain the reconstructed charging and discharging voltage curve of the battery under test.

[0061] In addition, to achieve the above objectives, the present invention also provides a battery charge-discharge voltage curve reconstruction system, the battery charge-discharge voltage curve reconstruction system comprising: a memory, a processor, and a battery charge-discharge voltage curve reconstruction program stored in the memory and executable on the processor, wherein when the battery charge-discharge voltage curve reconstruction program is executed by the processor, the steps of the battery charge-discharge voltage curve reconstruction method as described above are implemented.

[0062] In addition, to achieve the above objectives, the present invention also provides a storage medium storing a battery charge-discharge voltage curve reconstruction program, wherein when the battery charge-discharge voltage curve reconstruction program is executed by a processor, the battery charge-discharge voltage curve reconstruction program implements the steps of the battery charge-discharge voltage curve reconstruction method as described above.

[0063] The battery charge / discharge voltage curve reconstruction method proposed in this invention obtains the charge / discharge voltage curve of the calibration battery corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test; based on the standard charging time corresponding to the charge / discharge voltage curve of the calibration battery and the current charge / discharge voltage curve, a reconstructed charging voltage curve is determined; based on the reconstructed charging voltage curve, an instantaneous voltage drop curve and an instantaneous voltage drop are determined, and based on the current charge / discharge voltage curve and the instantaneous voltage drop, a reconstructed discharge voltage curve is determined; based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharge voltage curve, the reconstructed charge / discharge voltage curve of the battery under test is obtained. This invention reconstructs the current charge / discharge voltage curve from the charge / discharge voltage curve of the calibration battery to obtain the reconstructed charge / discharge voltage curve, ensuring that the charge / discharge voltage curve of the calibration battery and the reconstructed charge / discharge voltage curve are consistent on the time scale, thereby achieving comparability between the calibration battery and the individual battery cells, facilitating anomaly detection of individual battery cells. Attached Figure Description

[0064] Figure 1 This is a flowchart illustrating the first embodiment of the battery charge / discharge voltage curve reconstruction method of the present invention.

[0065] Figure 2 This is a schematic diagram showing the relationship between charging / discharging voltage and time during the offline identification process of the present invention.

[0066] Figure 3 This is a flowchart illustrating the second embodiment of the battery charge / discharge voltage curve reconstruction method of the present invention.

[0067] Figure 4 This is a flowchart illustrating the third embodiment of the battery charge / discharge voltage curve reconstruction method of the present invention.

[0068] Figure 5 This is a schematic diagram of the battery charge / discharge voltage curve reconstruction device of the present invention.

[0069] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0070] Reference Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the battery charge / discharge voltage curve reconstruction method of the present invention. The method includes:

[0071] Step S10: Obtain the calibration battery charge / discharge voltage curve corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test;

[0072] Step S20: Based on the standard charging time corresponding to the calibrated battery charge-discharge voltage curve and the current charge-discharge voltage curve, determine the reconstructed charging voltage curve;

[0073] Step S30: Determine the instantaneous voltage drop curve and instantaneous voltage drop based on the reconstructed charging voltage curve, and determine the reconstructed discharging voltage curve based on the current charging / discharging voltage curve and the instantaneous voltage drop.

[0074] Step S40: Based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharging voltage curve, obtain the reconstructed charging and discharging voltage curve of the battery under test.

[0075] This embodiment of the battery charge / discharge voltage curve reconstruction method is applied to the battery charge / discharge voltage curve reconstruction system in a battery anomaly detection system. This system can be applied to intelligent devices such as terminal devices and PC terminals. For ease of description, the battery charge / discharge voltage curve reconstruction system is simply referred to as the curve reconstruction system, and the following explanation uses the curve reconstruction system as an example. The curve reconstruction system acquires the calibration battery charge / discharge voltage curve corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test. The curve reconstruction system acquires the standard charging time corresponding to the calibration battery charge / discharge voltage curve, determines the charging voltage curve segment in the current charge / discharge voltage curve, acquires the charging start time of the charging voltage curve segment, and, using the charging start time as the starting point, extracts a curve segment with a length equal to the standard charging time from the charging voltage curve segment to obtain the reconstructed charging voltage curve. The curve reconstruction system calculates the internal resistance of the battery under test and obtains the corresponding charging end current in the reconstructed charging voltage curve. Based on the internal resistance and charging end current, it calculates the instantaneous voltage drop and obtains the charging end voltage corresponding to the reconstructed charging voltage curve. Based on the charging end voltage and the instantaneous voltage drop, it determines the instantaneous voltage drop curve. The curve reconstruction system obtains the charging end voltage corresponding to the reconstructed charging voltage curve and calculates the discharge start voltage calibration value based on the charging end voltage and the instantaneous voltage drop. Based on the current charge / discharge voltage curve and the discharge start voltage calibration value, it determines the reconstructed discharge voltage curve. The curve reconstruction system splices the end of the reconstructed charging voltage curve with the start of the instantaneous voltage drop curve and splices the end of the instantaneous voltage drop curve with the start of the reconstructed discharge voltage curve to obtain the reconstructed charge / discharge voltage curve of the battery under test.

[0076] The battery charge / discharge voltage curve reconstruction method of this embodiment obtains the charge / discharge voltage curve of the calibration battery corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test; based on the standard charging time corresponding to the charge / discharge voltage curve of the calibration battery and the current charge / discharge voltage curve, a reconstructed charging voltage curve is determined; based on the reconstructed charging voltage curve, an instantaneous voltage drop curve and an instantaneous voltage drop are determined, and based on the current charge / discharge voltage curve and the instantaneous voltage drop, a reconstructed discharge voltage curve is determined; based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharge voltage curve, the reconstructed charge / discharge voltage curve of the battery under test is obtained. This invention reconstructs the current charge / discharge voltage curve from the charge / discharge voltage curve of the calibration battery to obtain the reconstructed charge / discharge voltage curve, ensuring that the charge / discharge voltage curve of the calibration battery and the reconstructed charge / discharge voltage curve are consistent on the time scale, thereby achieving comparability between the calibration battery and individual battery cells, facilitating anomaly detection of individual battery cells.

[0077] The following will provide a detailed explanation of each step:

[0078] Step S10: Obtain the calibration battery charge / discharge voltage curve corresponding to the battery under test and the current charge / discharge voltage curve of the battery under test;

[0079] In this embodiment, the curve reconstruction system samples the normal charge and discharge voltage data of the battery under test based on a preset sampling time to obtain the calibrated charge and discharge voltage curve of the battery under test; similarly, the curve reconstruction system samples the normal charge and discharge voltage data of the battery under test based on a preset sampling time to obtain the current charge and discharge voltage curve of the battery under test.

[0080] Specifically, step S10 includes:

[0081] Step S101: Obtain the battery type corresponding to the battery to be tested, and determine the calibration battery based on the battery type;

[0082] Step S102: According to the preset sampling time, obtain the first charge and discharge voltage data corresponding to the calibration battery, and determine the charge and discharge voltage curve of the calibration battery according to the first charge and discharge voltage data.

[0083] In steps S102 to S103, the curve reconstruction system acquires the battery type corresponding to the battery under test, determines the corresponding calibration battery based on the battery type, performs actual measurements on the calibration battery at a preset sampling time, determines multiple charge-discharge voltage data curves for the calibration battery, and averages the multiple charge-discharge voltage data curves to obtain the calibration battery charge-discharge voltage curve corresponding to the calibration battery. It should be noted that the calibration battery charge-discharge voltage curves corresponding to different types of batteries under test are different; that is, the same type of battery under test can use the same calibration battery charge-discharge voltage curve. If the calibration battery is a battery pack (composed of multiple batteries connected in series), the maximum and minimum voltages in the charge-discharge voltage data can be removed before averaging to obtain the calibration battery charge-discharge voltage curve.

[0084] Optionally, the curve reconstruction system obtains the battery type corresponding to the battery to be tested, obtains a preset number of batteries of the same type, which are calibration batteries that have been tested without abnormalities, and obtains a set of calibration batteries. Each calibration battery in the set of calibration batteries is measured, and according to a preset sampling time, the first charge and discharge voltage data corresponding to each calibration battery is obtained, and the battery charge and discharge voltage curve of each calibration battery is obtained. Then, the charge and discharge voltage curves of all batteries are averaged to obtain the calibration battery charge and discharge voltage curve of the calibration battery of the same type as the battery to be tested.

[0085] Alternatively, the methods for obtaining the charge and discharge voltage curve of the calibration battery may also be: 1. Obtaining the charge and discharge voltage data of the calibration battery through an equivalent circuit model; 2. Obtaining the charge and discharge voltage data of the calibration battery through a battery degradation model; 3. Obtaining the charge and discharge voltage data of the calibration battery through other simulation methods.

[0086] Step S103: According to the preset sampling time, obtain the second charge / discharge voltage data corresponding to the battery under test, and determine the current charge / discharge voltage curve of the battery under test based on the second charge / discharge voltage data.

[0087] In this step, the curve reconstruction system performs charge and discharge operations on the battery under test. According to the preset sampling time, during the charge and discharge process of the battery under test, it acquires the second charge and discharge voltage data corresponding to the battery under test, and determines the current charge and discharge voltage curve of the battery under test based on the second charge and discharge voltage data.

[0088] Step S20: Based on the standard charging time corresponding to the calibrated battery charge-discharge voltage curve and the current charge-discharge voltage curve, determine the reconstructed charging voltage curve;

[0089] In this embodiment, after obtaining the calibration battery charge-discharge voltage curve and the current charge-discharge voltage curve of the battery to be tested, the curve reconstruction system obtains the standard charging time corresponding to the calibration battery charge-discharge voltage curve, and extracts the reconstructed charging voltage curve from the current charge-discharge voltage curve according to the standard charging time.

[0090] Specifically, step S20 includes:

[0091] Step S201: Obtain the standard charging time corresponding to the calibrated battery charge-discharge voltage curve, and determine the charging voltage curve segment in the current charge-discharge voltage curve;

[0092] In this step, the curve reconstruction system determines the corresponding charging voltage curve segment of the calibrated battery based on the corresponding charging and discharging voltage data on the calibrated battery charging and discharging voltage curve, and determines the standard charging time corresponding to the calibrated battery charging and discharging voltage curve based on the time scale information of the charging voltage curve segment; the curve reconstruction system determines and extracts the corresponding charging voltage curve segment from the current charging and discharging voltage curve based on the current charging and discharging voltage data on the current charging and discharging voltage curve.

[0093] Step S202: Obtain the charging start time of the charging voltage curve segment, and take the charging start time as the starting point to extract a curve segment with a length equal to the standard charging time from the charging voltage curve segment to obtain the reconstructed charging voltage curve.

[0094] In this step, the curve reconstruction system determines the charging start time of the charging voltage curve segment based on its time scale information. Using this start time as the starting point, it extracts a segment from the charging voltage curve segment with a length equal to the standard charging time, thus obtaining the reconstructed charging voltage curve. For example, if the standard charging time is 3 hours, the charging start time of the charging voltage curve segment is 12:00, and the charging end time is 16:00, the length of the charging voltage curve segment is 4 hours. The curve reconstruction system uses the charging start time of 12:00 as the starting point and extracts a segment from the charging voltage curve segment between 12:00 and 15:00 as the reconstructed charging voltage curve. It should be noted that if the charging time of the charging voltage curve segment is less than the standard charging time, it may be because the battery under test is not at zero charge or has not been fully charged. In this case, the battery under test needs to be discharged again until its charge reaches zero, and then charging and discharging are repeated. During this charging and discharging process, the current charge / discharge voltage curve of the battery under test is re-acquired.

[0095] Step S30: Determine the instantaneous voltage drop curve and instantaneous voltage drop based on the reconstructed charging voltage curve, and determine the reconstructed discharging voltage curve based on the current charging / discharging voltage curve and the instantaneous voltage drop.

[0096] In this embodiment, after determining the reconstructed charging voltage curve, the curve reconstruction system determines the instantaneous voltage drop curve and instantaneous voltage drop voltage corresponding to the battery under test based on the reconstructed charging voltage curve, and obtains the charging terminal voltage corresponding to the current charging and discharging voltage curve. Based on the charging terminal voltage and the instantaneous voltage drop voltage, the reconstructed discharging voltage curve is determined on the current charging and discharging voltage curve. It should be noted that during the charging and discharging process, due to the impedance effect, the voltage will experience a momentary voltage drop; therefore, it is necessary to determine the instantaneous voltage drop curve.

[0097] Specifically, the steps of determining the instantaneous voltage drop curve and the instantaneous voltage drop based on the reconstructed charging voltage curve include:

[0098] Step S301: Calculate the internal resistance value of the battery to be tested, and obtain the corresponding charging end current in the reconstructed charging voltage curve;

[0099] In this step, the curve reconstruction system calculates the internal resistance of the battery under test and obtains the corresponding charging end current in the reconstructed charging voltage curve. Specifically, the methods for calculating the internal resistance of the battery under test include offline identification and online identification. Offline identification is fast and convenient, with a small computational load, which can improve efficiency. Online identification can perform real-time calculation based on the actual operating data of the battery under test, and obtain an internal resistance value that is closer to the actual internal resistance value of the battery under test during operation.

[0100] The offline identification process involves inputting calibration pulses to the battery under test, obtaining and analyzing the relationship curve between the battery's charge / discharge voltage U and time T, thereby identifying relevant parameters. The relationship curve between charge / discharge voltage U and time T is shown below. Figure 2 As shown, Figure 2 In the curve, the relationship between charging / discharging voltage U and time T can be divided into four segments: AB, BC, CD, and DE. The specific determination of these four segments can be determined based on actual conditions, and the exact process is not limited here. The curve reconstruction system can calculate the internal resistance of the battery under test using either segment AB or segment CD, but CD is generally considered optimal. When the battery under test changes from loaded discharge to unloaded rest, the terminal voltage experiences a jump. Since the voltage across the capacitor in the battery under test cannot change abruptly in its equivalent circuit, the sudden rise in terminal voltage is caused by the internal resistance of the battery. The internal resistance of the battery under test can be calculated using the relationship between the voltage drop and current during the abrupt change in segment CD. The specific calculation formula is as follows:

[0101]

[0102] Where R0 is the internal resistance of the battery to be tested, and U D for Figure 2 The voltage value at point D, U C for Figure 2 The voltage value at point C is given, and I is the current value of the calibration pulse.

[0103] The online identification process is as follows: Online parameter identification is performed using a recursive least squares method with a forgetting factor. In practical applications, this method can quickly converge and track the ideal operating state of the battery, and the determined internal resistance value is more consistent with reality. Taking the second-order RC equivalent circuit of the battery under test as an example, the Laplace equation of the battery model is:

[0104]

[0105] Where E is the open-circuit voltage of the battery under test, U is the terminal voltage of the battery under test at a certain time, and R... s R is the internal resistance of capacitor s in the battery to be tested. p The internal resistance of capacitor p in the battery under test, R, and C are the internal resistances of the battery under test. s The capacitance value of capacitor s in the battery to be tested, C p The capacitance p in the battery to be tested is the capacitance value, and s is the Laplace operator.

[0106] Discretization is performed using a bilinear transform, let Where T is the sampling time interval and Z is the voltage signal value in the Z domain.

[0107] The discretized transfer function can be obtained as follows:

[0108]

[0109] Where a1, a2, a3, a4, and a5 are the corresponding constant coefficients, the transfer function is transformed into a difference equation:

[0110] y(k)=E(k)-U(k)=a 1y (k-1)+a 2y (k-2)+a3I(k)+a4I(k-1)+a5I(k-2)

[0111] Where I(k) is the system input, y(k) is the system output, k is the voltage signal value at the current moment, k-1 is the voltage signal value at the previous moment, and k-2 is the voltage signal value at the moment before the previous moment. Using the recursive least squares iterative formula with forgetting factor, the output value of the difference equation at each moment (i.e., the voltage of the battery under test) and the coefficients of the difference equation can be calculated. Based on the coefficients of the difference equation and the RC parameters, the constant coefficients a1, a2, a3, a4, and a5 can be calculated. Therefore, the internal resistance value of the battery under test can be identified and calculated online as follows:

[0112]

[0113] Step S302: Calculate the instantaneous voltage drop based on the internal resistance value and the charging end current;

[0114] In this step, after determining the internal resistance of the battery under test and the corresponding charging end current in the reconstructed charging voltage curve, the curve reconstruction system calculates the instantaneous voltage drop based on the internal resistance and the charging end current. Specifically, the formula for calculating the instantaneous voltage drop is as follows:

[0115] Δy=R0*I end

[0116] Where ΔV is the instantaneous voltage drop, R0 is the internal resistance of the battery under test, and I... end This is the charging end current.

[0117] Step S303: Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and determine the instantaneous voltage drop curve based on the charging end voltage and the instantaneous voltage drop.

[0118] In this step, the curve reconstruction system obtains the charging end voltage corresponding to the reconstructed charging voltage curve, and determines the instantaneous voltage drop curve in the current charge and discharge voltage curve of the battery under test based on the charging end voltage and the instantaneous voltage drop.

[0119] Specifically, the step of determining the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the instantaneous voltage drop includes:

[0120] Step S304: Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and calculate the discharge start voltage calibration value based on the charging end voltage and the instantaneous voltage drop.

[0121] Step S305: Determine the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the discharge head voltage calibration value.

[0122] In steps S304 to S305, the curve reconstruction system obtains the charging end voltage corresponding to the reconstructed charging voltage curve, calculates the difference between the charging end voltage and the instantaneous voltage drop, and then obtains the discharge start voltage calibration value of the battery under test. Based on the discharge start voltage calibration value, the system determines the first voltage value on the current charge-discharge voltage curve that is less than the discharge start voltage calibration value. Starting from this voltage value, the system extracts the curve segment on the current charge-discharge voltage curve after this voltage value to obtain the reconstructed discharge voltage curve.

[0123] Step S40: Based on the reconstructed charging voltage curve, the instantaneous voltage drop curve, and the reconstructed discharging voltage curve, obtain the reconstructed charging and discharging voltage curve of the battery under test.

[0124] Specifically, step S40 includes:

[0125] The end of the reconstructed charging voltage curve is spliced ​​with the beginning of the instantaneous voltage drop curve, and the end of the instantaneous voltage drop curve is spliced ​​with the beginning of the reconstructed discharging voltage curve to reconstruct the reconstructed charging and discharging voltage curve of the battery under test.

[0126] In this embodiment, after obtaining the reconstructed charging voltage curve, instantaneous voltage drop curve, and reconstructed discharging voltage curve, the curve reconstruction system splices the end of the reconstructed charging voltage curve with the beginning of the instantaneous voltage drop curve, and splices the end of the instantaneous voltage drop curve with the beginning of the reconstructed discharging voltage curve to reconstruct the reconstructed charging and discharging voltage curve of the battery under test. The time length of the reconstructed charging and discharging voltage curve may be the same as or different from the time length of the calibration battery charging and discharging voltage curve. The sampling time corresponding to the sample point in the calibration battery charging and discharging voltage curve is the same as the sampling time corresponding to the sample point in the reconstructed charging and discharging voltage curve.

[0127] The battery charge / discharge voltage curve reconstruction system in this embodiment acquires the calibration battery charge / discharge voltage curve and the current charge / discharge voltage curve of the battery under test. The system acquires the standard charging duration corresponding to the calibration battery charge / discharge voltage curve, determines a charging voltage curve segment within the current charge / discharge voltage curve, obtains the charging start time of the charging voltage curve segment, and, using the charging start time as the starting point, extracts a curve segment of length equal to the standard charging duration from the charging voltage curve segment to obtain the reconstructed charging voltage curve. The system calculates the internal resistance value of the battery under test and acquires the corresponding charging end current in the reconstructed charging voltage curve. Based on the internal resistance value and the charging end current... The system calculates the instantaneous voltage drop, obtains the charging terminal voltage corresponding to the reconstructed charging voltage curve, and determines the instantaneous voltage drop curve based on the charging terminal voltage and the instantaneous voltage drop. The curve reconstruction system obtains the charging terminal voltage corresponding to the reconstructed charging voltage curve, calculates the discharge terminal voltage calibration value based on the charging terminal voltage and the instantaneous voltage drop, and determines the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the discharge terminal voltage calibration value. The curve reconstruction system then splices the end of the reconstructed charging voltage curve with the beginning of the instantaneous voltage drop curve, and splices the end of the instantaneous voltage drop curve with the beginning of the reconstructed discharge voltage curve to obtain the reconstructed charge / discharge voltage curve of the battery under test. By reconstructing the current charge / discharge voltage curve using the calibrated battery's charge / discharge voltage curve, the reconstructed charge / discharge voltage curve and the reconstructed charge / discharge voltage curve remain consistent on the time scale, thereby achieving comparability between the calibrated battery and individual battery cells, facilitating anomaly detection of individual battery cells.

[0128] Further, refer to Figure 3 The second embodiment of the present invention is proposed. The difference between the second embodiment and the first embodiment is that the step of determining the instantaneous voltage drop curve based on the charging end voltage and the instantaneous voltage drop includes:

[0129] Step S3031: Obtain the battery type and operating condition information of the battery under test, and determine the time for the battery under test to complete the instantaneous voltage drop based on the battery type and the operating condition information;

[0130] Step S3032: Determine the instantaneous voltage drop curve based on the charging end voltage, the instantaneous voltage drop, and the time to complete the instantaneous voltage drop.

[0131] In this embodiment, the time for the battery under test to complete the instantaneous voltage drop can be determined based on the specific battery type and operating condition information. Since the internal resistance values ​​of different types of batteries under test are generally very small, the time to complete the instantaneous voltage drop is usually very short, such as 0.1 seconds or 1 second. Furthermore, the operating condition information of the battery under test also has a certain impact on the time to complete the instantaneous voltage drop. The time to complete the instantaneous voltage drop can be adjusted according to the operating condition information to make the instantaneous voltage drop time closer to the actual time. The curve reconstruction system acquires the battery type and operating condition information of the battery under test and determines the time for the battery to complete the instantaneous voltage drop based on this information. During the charging and discharging conversion process of the battery under test, due to the impedance effect, a segment of instantaneous voltage drop will appear on the current charging and discharging voltage curve. Based on the charging end voltage, instantaneous voltage drop voltage, and the time to complete the instantaneous voltage drop in the reconstructed charging voltage curve, the curve reconstruction system reconstructs the instantaneous voltage drop curve of the battery under test from the segment of instantaneous voltage drop on the current charging and discharging voltage curve.

[0132] The battery charge / discharge voltage curve reconstruction system of this embodiment determines the instantaneous voltage drop curve based on the charging end voltage, instantaneous voltage drop, and the time to complete the instantaneous voltage drop. This improves the comparability between the instantaneous voltage drop curve and the instantaneous voltage drop curve of the calibration battery in the charge / discharge voltage curve of the calibration battery, helps to achieve comparability between the calibration battery and the battery cell, and facilitates the detection of anomalies in the battery cell.

[0133] Further, refer to Figure 4 The present invention proposes a third embodiment, which differs from the first and second embodiments in that the step of determining the reconstructed discharge voltage curve based on the current charge / discharge voltage curve and the discharge head voltage calibration value includes:

[0134] Step 3051: Extract a segment of the discharge voltage curve from the current charge / discharge voltage curve, and obtain the discharge voltage value of the segment in sequence according to the time order of the discharge voltage curve segments.

[0135] Step 3052: Compare the discharge voltage value with the discharge start-end voltage calibration value to determine the discharge start-end voltage;

[0136] Step 3053: Extract a segment from the discharge voltage curve that starts at the discharge head voltage to obtain the reconstructed discharge voltage curve.

[0137] In this embodiment, the curve reconstruction system determines and extracts the discharge voltage curve segment from the current charge / discharge voltage curve based on the current charge / discharge voltage data. It then sequentially acquires the discharge voltage values ​​of the discharge voltage curve segments according to their time sequence. These discharge voltage values ​​are compared with the discharge start-up voltage calibration value to determine the first voltage value on the discharge voltage curve segment that is not greater than the discharge start-up voltage calibration value. This first voltage value is taken as the discharge start-up voltage. Starting from the position of this discharge start-up voltage on the discharge voltage curve segment, a curve segment is extracted from the discharge voltage curve segment starting at that position to determine the reconstructed discharge voltage curve. It can be understood that the reconstructed discharge voltage curve starts from the position of the first voltage value on the discharge voltage curve segment that is not greater than the discharge start-up voltage calibration value and ends at the position of the last voltage value on the discharge voltage curve segment.

[0138] The battery charge / discharge voltage curve reconstruction system of this embodiment compares the discharge voltage value of the discharge voltage curve segment with the discharge start voltage calibration value to determine the discharge start voltage. Based on the discharge start voltage, a reconstructed discharge voltage curve is obtained on the discharge voltage curve segment. This improves the comparability between the reconstructed discharge voltage curve and the calibration battery discharge voltage curve in the calibration battery charge / discharge voltage curve, which helps to achieve comparability between the calibration battery and the battery cell, and facilitates the detection of abnormalities in the battery cell.

[0139] like Figure 5 As shown, the present invention also provides a battery charge-discharge voltage curve reconstruction device. The battery charge-discharge voltage curve reconstruction device of the present invention includes:

[0140] The acquisition module 101 is used to acquire the calibration battery charge-discharge voltage curve corresponding to the battery under test and the current charge-discharge voltage curve of the battery under test.

[0141] The first determining module 102 is used to determine the reconstructed charging voltage curve based on the standard charging time corresponding to the calibration battery charging and discharging voltage curve and the current charging and discharging voltage curve.

[0142] The second determining module 103 is used to determine the instantaneous voltage drop curve and the instantaneous voltage drop based on the reconstructed charging voltage curve, and to determine the reconstructed discharging voltage curve based on the current charging and discharging voltage curve and the instantaneous voltage drop.

[0143] The reconstruction module 104 is used to obtain the reconstructed charge and discharge voltage curve of the battery under test based on the reconstructed charging voltage curve, the instantaneous voltage drop curve and the reconstructed discharge voltage curve.

[0144] Furthermore, the acquisition module is also used for:

[0145] Obtain the battery type corresponding to the battery to be tested, and determine the calibration battery set based on the battery type;

[0146] According to the preset sampling time, the first charge and discharge voltage data corresponding to each calibration battery in the calibration battery set is obtained, and the charge and discharge voltage curve of the calibration battery is determined according to the first charge and discharge voltage data.

[0147] According to the preset sampling time, the second charge and discharge voltage data corresponding to the battery under test is obtained, and the current charge and discharge voltage curve of the battery under test is determined according to the second charge and discharge voltage data.

[0148] Furthermore, the first determining module is also used for:

[0149] Obtain the standard charging duration corresponding to the calibrated battery charge-discharge voltage curve, and determine the charging voltage curve segment in the current charge-discharge voltage curve;

[0150] Obtain the charging start time of the charging voltage curve segment, and take the charging start time as the starting point to extract a curve segment with a length equal to the standard charging time from the charging voltage curve segment to obtain the reconstructed charging voltage curve.

[0151] Furthermore, the second determining module is also used for:

[0152] Calculate the internal resistance of the battery under test and obtain the corresponding charging end current in the reconstructed charging voltage curve;

[0153] The instantaneous voltage drop is calculated based on the internal resistance value and the charging end current.

[0154] Obtain the charging terminal voltage corresponding to the reconstructed charging voltage curve, and determine the instantaneous voltage drop curve based on the charging terminal voltage and the instantaneous voltage drop.

[0155] Furthermore, the second determining module is also used for:

[0156] Obtain the battery type and operating condition information of the battery under test, and determine the time for the battery under test to complete the instantaneous voltage drop based on the battery type and the operating condition information;

[0157] The instantaneous voltage drop curve is determined based on the charging end voltage, the instantaneous voltage drop, and the time to complete the instantaneous voltage drop.

[0158] Furthermore, the second determining module is also used for:

[0159] Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and calculate the discharge start voltage calibration value based on the charging end voltage and the instantaneous voltage drop.

[0160] The reconstructed discharge voltage curve is determined based on the current charge / discharge voltage curve and the discharge head voltage calibration value.

[0161] Furthermore, the second determining module is also used for:

[0162] Extract a segment of the discharge voltage curve from the current charge / discharge voltage curve, and obtain the discharge voltage value of the segment in sequence according to the time order of the discharge voltage curve segment;

[0163] The discharge voltage value is compared with the discharge start-up voltage calibration value to determine the discharge start-up voltage;

[0164] A segment of the discharge voltage curve, starting from the discharge head voltage, is extracted to obtain the reconstructed discharge voltage curve.

[0165] Furthermore, the reconstruction module is also used for:

[0166] The end of the reconstructed charging voltage curve is spliced ​​with the beginning of the instantaneous voltage drop curve, and the end of the instantaneous voltage drop curve is spliced ​​with the beginning of the reconstructed discharging voltage curve to obtain the reconstructed charging and discharging voltage curve of the battery under test.

[0167] The present invention also provides a battery charge and discharge voltage curve reconstruction system.

[0168] The battery charge / discharge voltage curve reconstruction system includes: a memory, a processor, and a battery charge / discharge voltage curve reconstruction program stored in the memory and executable on the processor. When the battery charge / discharge voltage curve reconstruction program is executed by the processor, it implements the steps of the battery charge / discharge voltage curve reconstruction method as described above.

[0169] The method implemented when the battery charge-discharge voltage curve reconstruction program running on the processor is executed can be referred to in various embodiments of the battery charge-discharge voltage curve reconstruction method of the present invention, and will not be repeated here.

[0170] The present invention also provides a storage medium.

[0171] The storage medium stores a battery charge / discharge voltage curve reconstruction program, which, when executed by the processor, implements the steps of the battery charge / discharge voltage curve reconstruction method as described above.

[0172] The method implemented when the battery charge-discharge voltage curve reconstruction program running on the processor is executed can be referred to in various embodiments of the battery charge-discharge voltage curve reconstruction method of the present invention, and will not be repeated here.

[0173] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0174] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0175] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0176] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery charge-discharge voltage curve reconstruction method, characterized in that, The battery charging and discharging voltage curve reconstruction method comprises the following steps: Obtain the calibration battery charging and discharging voltage curve corresponding to the battery to be detected and the current charging and discharging voltage curve of the battery to be detected; Determine the reconstructed charging voltage curve based on the charging standard time length corresponding to the calibration battery charging and discharging voltage curve and the current charging and discharging voltage curve; Determine the instantaneous pressure drop curve and the instantaneous pressure drop voltage according to the reconstructed charging voltage curve, and determine the reconstructed discharging voltage curve according to the current charging and discharging voltage curve and the instantaneous pressure drop voltage; Obtain the reconstructed charging and discharging voltage curve of the battery to be detected according to the reconstructed charging voltage curve, the instantaneous pressure drop curve and the reconstructed discharging voltage curve; The step of determining the reconstructed charging voltage curve based on the charging standard time length corresponding to the calibration battery charging and discharging voltage curve and the current charging and discharging voltage curve comprises: Obtain the reconstructed charging voltage curve by intercepting the current charging and discharging voltage curve according to the charging standard time length, wherein the length of the interception is the charging standard time length; The step of determining the instantaneous pressure drop curve and the instantaneous pressure drop voltage according to the reconstructed charging voltage curve comprises: Calculate the internal resistance value of the battery to be detected, and obtain the charging end current corresponding to the reconstructed charging voltage curve; Calculate the instantaneous pressure drop voltage according to the internal resistance value and the charging end current; Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and determine the instantaneous pressure drop curve according to the charging end voltage and the instantaneous pressure drop voltage; The step of determining the instantaneous pressure drop curve according to the charging end voltage and the instantaneous pressure drop voltage comprises: Obtain the battery type and working condition information of the battery to be detected, and determine the time for the battery to be detected to complete the instantaneous pressure drop based on the battery type and the working condition information; Determine the instantaneous pressure drop curve based on the charging end voltage, the instantaneous pressure drop voltage and the time for completing the instantaneous pressure drop; The step of determining the reconstructed discharging voltage curve according to the current charging and discharging voltage curve and the instantaneous pressure drop voltage comprises: Obtain the charging end voltage corresponding to the reconstructed charging voltage curve, and calculate the discharging first end voltage calibration value according to the difference between the charging end voltage and the instantaneous pressure drop voltage; Intercept the discharging voltage curve segment in the current charging and discharging voltage curve, take the position of the first discharging voltage value in the discharging voltage curve segment which is not greater than the discharging first end voltage calibration value as the starting point, and take the position of the last voltage value in the discharging voltage curve segment as the end point, thereby obtaining the reconstructed discharging voltage curve by intercepting the discharging voltage curve segment in the discharging voltage curve segment; The step of obtaining the reconstructed charging and discharging voltage curve of the battery to be detected according to the reconstructed charging voltage curve, the instantaneous pressure drop curve and the reconstructed discharging voltage curve comprises: Splice the end of the reconstructed charging voltage curve with the beginning of the instantaneous pressure drop curve, and splice the end of the instantaneous pressure drop curve with the beginning of the reconstructed discharging voltage curve, thereby obtaining the reconstructed charging and discharging voltage curve of the battery to be detected.

2. The battery charge-discharge voltage profile reconstruction method of claim 1, wherein, The step of acquiring the calibration battery charge-discharge voltage curve corresponding to the battery to be detected and the current charge-discharge voltage curve of the battery to be detected comprises: acquiring the battery type corresponding to the battery to be detected, and determining a calibration battery based on the battery type; According to the preset sampling time, the first charge-discharge voltage data corresponding to the calibration battery is acquired, and the calibration battery charge-discharge voltage curve is determined according to the first charge-discharge voltage data; According to the preset sampling time, the second charge-discharge voltage data corresponding to the battery to be detected is acquired, and the current charge-discharge voltage curve of the battery to be detected is determined according to the second charge-discharge voltage data.

3. The battery charge-discharge voltage profile reconstruction method of claim 1, wherein, The step of determining the reconstructed charge voltage curve based on the charge standard duration corresponding to the calibration battery charge-discharge voltage curve and the current charge-discharge voltage curve comprises: acquiring the charge standard duration corresponding to the calibration battery charge-discharge voltage curve, and determining the charge voltage curve segment in the current charge-discharge voltage curve; acquiring the charge starting time of the charge voltage curve segment, and taking the charge starting time as the starting point to intercept the curve segment with the length of the charge standard duration in the charge voltage curve segment to obtain the reconstructed charge voltage curve.

4. A battery charge-discharge voltage curve reconstruction device, characterized by, The battery charge-discharge voltage curve reconstruction device comprises: an acquisition module for acquiring the calibration battery charge-discharge voltage curve corresponding to the battery to be detected and the current charge-discharge voltage curve of the battery to be detected; a first determination module for determining a reconstructed charge voltage curve based on the charge standard duration corresponding to the calibration battery charge-discharge voltage curve and the current charge-discharge voltage curve; a second determination module for determining an instantaneous pressure drop curve and an instantaneous pressure drop voltage according to the reconstructed charge voltage curve, and determining a reconstructed discharge voltage curve according to the current charge-discharge voltage curve and the instantaneous pressure drop voltage; a reconstruction module for obtaining the reconstructed charge-discharge voltage curve of the battery to be detected according to the reconstructed charge voltage curve, the instantaneous pressure drop curve and the reconstructed discharge voltage curve; The step of determining the reconstructed charge voltage curve based on the charge standard duration corresponding to the calibration battery charge-discharge voltage curve and the current charge-discharge voltage curve comprises: According to the charge standard duration, the reconstructed charge voltage curve is obtained by intercepting the current charge-discharge voltage curve, and the length of the interception is the charge standard duration; The step of determining the reconstructed charge voltage curve based on the charge standard duration corresponding to the calibration battery charge-discharge voltage curve and the current charge-discharge voltage curve comprises: According to the charge standard duration, the reconstructed charge voltage curve is obtained by intercepting the current charge-discharge voltage curve, and the length of the interception is the charge standard duration; The step of determining the instantaneous pressure drop curve and the instantaneous pressure drop voltage according to the reconstructed charge voltage curve comprises: calculating the internal resistance value of the battery to be detected, and acquiring the corresponding charge end current in the reconstructed charge voltage curve; According to the internal resistance value and the charge end current, the instantaneous pressure drop voltage is calculated. acquire a charging end voltage corresponding to the reconstructed charging voltage curve, and determine a transient voltage drop curve according to the charging end voltage and the transient voltage drop voltage; the determining of the transient voltage drop curve according to the charging end voltage and the transient voltage drop voltage comprises: acquire a battery type and working condition information of the battery to be detected, and determine a time for the battery to be detected to complete transient voltage drop based on the battery type and the working condition information; determine a transient voltage drop curve based on the charging end voltage, the transient voltage drop voltage and the time for the battery to complete transient voltage drop; the determining of the reconstructed discharging voltage curve according to the current charging and discharging voltage curve and the transient voltage drop voltage comprises: acquire a charging end voltage corresponding to the reconstructed charging voltage curve, and calculate a discharging first end voltage calibration value according to a difference between the charging end voltage and the transient voltage drop voltage; cut a discharging voltage curve segment from the current charging and discharging voltage curve, take a position where a first discharging voltage value in the discharging voltage curve segment is not greater than the discharging first end voltage calibration value as a starting point, and take a position of a last voltage value in the discharging voltage curve segment as an ending point, so as to cut the reconstructed discharging voltage curve from the discharging voltage curve segment; the obtaining of the reconstructed charging and discharging voltage curve of the battery to be detected according to the reconstructed charging voltage curve, the transient voltage drop curve and the reconstructed discharging voltage curve comprises: splice an end of the reconstructed charging voltage curve with a first end of the transient voltage drop curve, and splice an end of the transient voltage drop curve with a first end of the reconstructed discharging voltage curve, so as to obtain the reconstructed charging and discharging voltage curve of the battery to be detected.

5. A battery charge-discharge voltage curve reconstruction system, characterized by, The battery charging and discharging voltage curve reconstruction system comprises a memory, a processor and a battery charging and discharging voltage curve reconstruction program stored on the memory and executable on the processor, and the battery charging and discharging voltage curve reconstruction program, when executed by the processor, implements the steps of the battery charging and discharging voltage curve reconstruction method according to any one of claims 1 to 3.

6. A storage medium, characterized by The storage medium stores a battery charging and discharging voltage curve reconstruction program, and the battery charging and discharging voltage curve reconstruction program, when executed by the processor, implements the steps of the battery charging and discharging voltage curve reconstruction method according to any one of claims 1 to 3.

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