Power battery equalization effect verification method and device, vehicle and storage medium

Abstract

The application discloses a power battery equalization effect verification method and device, a vehicle and a storage medium. The method comprises the following steps: acquiring a first voltage difference set of the power battery within a first preset time before power battery equalization, and determining the voltage difference type before power battery equalization according to the first voltage difference set; acquiring a second voltage difference set of the power battery within the first preset time after power battery equalization, and determining the voltage difference type after power battery equalization according to the second voltage difference set; and verifying the power battery equalization effect according to the voltage difference type before power battery equalization and the voltage difference type after power battery equalization. The verification method can identify the source of the voltage difference, and verify the power battery equalization effect according to the voltage difference type before power battery equalization and the voltage difference type after power battery equalization, thereby reducing the after-sales maintenance cost and improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method for verifying the balancing effect of a power battery, a device for verifying the balancing effect of a power battery, a computer-readable storage medium, and a vehicle. Background Technology

[0002] Voltage differential issues within the battery pack of electric vehicles can lead to problems such as insufficient charging and short driving range. Therefore, it is necessary to balance the voltage differential of the individual cells within the battery pack. To determine the effectiveness of the battery pack balancing, verification of the balancing effect is required. Currently, verification of the balancing effect mainly involves real-vehicle testing after software reprogramming. This involves statistically analyzing the balancing activation duration and balancing current of the test vehicles to calculate the balancing capacity and evaluate the balancing effect. In practice, this process requires significant manpower and time to collect balancing vehicle data, and the analysis results are primarily used to determine whether the software is executing according to the strategy requirements. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a method for verifying the balancing effect of a power battery, capable of identifying the source of voltage difference and verifying the balancing effect of the power battery based on the type of voltage difference before and after balancing, thereby reducing after-sales maintenance costs and improving user experience.

[0004] The second objective of this invention is to provide a power battery balancing effect verification device.

[0005] A third objective of this invention is to provide a computer-readable storage medium.

[0006] The fourth objective of this invention is to provide a vehicle.

[0007] To achieve the above objectives, a first aspect of the present invention provides a method for verifying the balancing effect of a power battery. The method includes: obtaining a first voltage difference set of the power battery within a first preset time period before balancing, and determining the voltage difference type before balancing based on the first voltage difference set; obtaining a second voltage difference set of the power battery within a first preset time period after balancing, and determining the voltage difference type after balancing based on the second voltage difference set; and verifying the balancing effect of the power battery based on the voltage difference type before balancing and the voltage difference type after balancing.

[0008] According to the power battery balancing effect verification method of the present invention, a first voltage difference set of the power battery within a first preset time period before balancing is obtained, and the voltage difference type before balancing is determined based on the first voltage difference set. A second voltage difference set of the power battery within a first preset time period after balancing is obtained, and the voltage difference type after balancing is determined based on the second voltage difference set. The balancing effect of the power battery is verified based on the voltage difference types before and after balancing. Therefore, this method can identify the source of voltage difference and verify the balancing effect of the power battery based on the voltage difference types before and after balancing, reducing after-sales maintenance costs and improving user experience.

[0009] In addition, the power battery balancing effect verification method according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, obtaining a first voltage difference set of a power battery within a first preset time period before power battery equalization includes: obtaining the maximum and minimum voltage values ​​of individual cells in the power battery at second preset time intervals; determining the first voltage difference of the power battery based on the maximum and minimum voltage values; and determining a first voltage difference set based on multiple first voltage differences within the first preset time period, wherein the first preset time period is divided into multiple second preset time periods.

[0011] According to some embodiments of the present invention, determining the voltage difference type before equalization of the power battery based on a first voltage difference set includes: determining the slope of the fitted straight line based on the first voltage difference set; determining the voltage difference type before equalization of the power battery to be a voltage difference increasing type when the slope is greater than zero; determining the voltage difference type before equalization of the power battery to be a voltage difference decreasing type when the slope is less than zero; and determining the voltage difference type before equalization of the power battery to be a voltage difference stabilizing type when the slope is equal to zero.

[0012] According to some embodiments of the present invention, when the slope is greater than zero, the above-mentioned power battery balancing effect verification method further includes: determining that the absolute value of the difference between the maximum voltage difference and the minimum voltage difference in the first voltage difference set is greater than a first preset threshold, and the maximum voltage difference in the first voltage difference set is greater than a second preset threshold.

[0013] According to some embodiments of the present invention, when the power battery includes a vehicle power battery, verifying the power battery balancing effect based on the voltage difference type before and after power battery balancing includes: determining the change slope of the power battery before balancing based on a first voltage difference set; determining the change slope of the power battery after balancing based on a second voltage difference set; and verifying the power battery balancing effect based on the change slope of the power battery before and after balancing when the voltage difference type before and after power battery balancing are consistent.

[0014] According to some embodiments of the present invention, the verification of the power battery balancing effect based on the change slope before and after power battery balancing includes: if the change slope is greater than zero, and the change slope after power battery balancing is less than the change slope before power battery balancing, then the power battery balancing effect verification is determined to be effective; if the change slope is less than zero, and the change slope after power battery balancing is greater than the change slope before power battery balancing, then the power battery balancing effect verification is determined to be effective.

[0015] According to other embodiments of the present invention, when the power battery includes power batteries of multiple vehicles, the power battery balancing effect is verified based on the voltage difference type before power battery balancing and the voltage difference type after power battery balancing, including: obtaining the proportion of each voltage difference type of the power battery before balancing for all vehicles, and obtaining the proportion of each voltage difference type of the power battery after balancing for all vehicles; and verifying the power battery balancing effect based on the proportion of each voltage difference type before balancing and the proportion of each voltage difference type after balancing.

[0016] To achieve the above objectives, a second aspect of the present invention provides a power battery balancing effect verification device, comprising: a first acquisition module for acquiring a first voltage difference set of the power battery within a first preset time period before power battery balancing; a first determination module for determining the voltage difference type before power battery balancing based on the first voltage difference set; a second acquisition module for acquiring a second voltage difference set of the power battery within a first preset time period after power battery balancing; a second determination module for determining the voltage difference type after power battery balancing based on the second voltage difference set; and a verification module for verifying the power battery balancing effect based on the voltage difference type before power battery balancing and the voltage difference type after power battery balancing.

[0017] According to an embodiment of the present invention, a power battery balancing effect verification device comprises a first acquisition module acquiring a first voltage difference set of the power battery within a first preset time period before balancing, a first determination module determining the voltage difference type before balancing based on the first voltage difference set, a second acquisition module acquiring a second voltage difference set of the power battery within a first preset time period after balancing, a second determination module determining the voltage difference type after balancing based on the second voltage difference set, and a verification module verifying the power battery balancing effect based on the voltage difference type before and after balancing. Thus, the device can identify the source of voltage difference and verify the power battery balancing effect based on the voltage difference type before and after balancing, reducing after-sales maintenance costs and improving user experience.

[0018] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a power battery balancing effect verification program thereon, which, when executed by a processor, implements the power battery balancing effect verification method described above.

[0019] The computer-readable storage medium of this invention, by executing the above-described power battery balancing effect verification method, can identify the source of voltage difference and verify the power battery balancing effect according to the type of voltage difference before and after power battery balancing, thereby reducing after-sales maintenance costs and improving user experience.

[0020] To achieve the above objectives, a fourth aspect of the present invention provides a vehicle including a memory, a processor, and a power battery balancing effect verification program stored in the memory and executable on the processor. When the processor executes the power battery balancing effect verification program, it implements the above-described power battery balancing effect verification method.

[0021] According to the vehicle of the present invention, by performing the above-described power battery balancing effect verification method, the source of voltage difference can be identified, and the power battery balancing effect can be verified according to the type of voltage difference before and after power battery balancing, thereby reducing after-sales maintenance costs and improving user experience.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 A flowchart of a power battery balancing effect verification method according to some embodiments of the present invention;

[0024] Figure 2 This is a schematic diagram comparing the vehicle's balance effect before and after balancing according to some embodiments of the present invention.

[0025] Figure 3This is a block diagram of a power battery balancing effect verification device according to some embodiments of the present invention;

[0026] Figure 4 This is a block diagram of a vehicle according to some embodiments of the present invention. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following description, with reference to the accompanying drawings, outlines the power battery balancing effect verification method, power battery balancing effect verification device, computer-readable storage medium, and vehicle proposed in embodiments of the present invention.

[0029] Figure 1 This is a flowchart of a method for verifying the balancing effect of a power battery according to some embodiments of the present invention.

[0030] like Figure 1 As shown, the power battery balancing effect verification method of this invention embodiment may include the following steps:

[0031] S1, obtain the first voltage difference set of the power battery within a first preset time before the power battery equalization, and determine the voltage difference type before the power battery equalization based on the first voltage difference set. The first preset time can be calibrated according to the actual situation.

[0032] Specifically, before the power batteries are balanced, the voltage differences of the power batteries within a first preset time period are statistically analyzed using big data methods to form a voltage difference set, denoted as the first voltage difference set. For example, there are at least three voltage differences each month, which are used to determine the voltage difference type. For example, curve fitting is performed on the voltage differences in the first voltage difference set of the power batteries within the first preset time period to obtain the trend of voltage difference changes, thereby determining the voltage difference type before the power batteries are balanced.

[0033] S2, obtain the second voltage difference set of the power battery within a first preset time after the power battery is balanced, and determine the voltage difference type after the power battery is balanced based on the second voltage difference set.

[0034] Specifically, the need for battery balancing is determined based on the voltage difference of the power battery. For example, a voltage difference threshold is determined based on the battery's current charge level. When the voltage difference exceeds the threshold corresponding to the current battery charge level, balancing is required. The voltage difference threshold varies across different charge levels. Due to the battery's extreme discharge characteristics, the voltage difference threshold is larger when the charge level is at the lower or higher end of the range, and smaller when the charge level is in the middle range.

[0035] During the product design phase, balancing software can be flashed based on a balancing scheme that matches the voltage difference of the power battery before balancing with the balancing capability of the BMS (Battery Management System). During after-sales maintenance, the balancing scheme is determined based on the voltage difference of the power battery. After balancing, the voltage differences of the power battery over a first preset time period are statistically analyzed to form a voltage difference set, denoted as the second voltage difference set, which is used to determine the voltage difference type. For example, curve fitting can be performed on the voltage differences in the second voltage difference set of the power battery over the first preset time period to obtain the voltage difference change trend, thereby determining the voltage difference type after balancing.

[0036] S3 verifies the balancing effect of the power battery based on the type of voltage difference before and after balancing.

[0037] Specifically, after obtaining the voltage difference type before and after battery balancing, the balancing effect can be verified. For example, if the voltage difference type before and after balancing is both increasing, and the rate of increase in voltage difference after balancing is less than the rate of increase before balancing, then the balancing effect is effective; if the rate of increase in voltage difference after balancing is greater than the rate of increase before balancing, then the balancing effect is ineffective. Similarly, if the voltage difference type before balancing is increasing, and the voltage difference type after balancing is stable, then the balancing effect is effective. Therefore, the balancing effect of the battery can be verified based on the voltage difference type before and after balancing, and the source of the voltage difference can be determined based on the magnitude of the voltage difference before and after balancing. This reduces after-sales maintenance costs, mitigates problems such as insufficient charging and short driving range caused by battery voltage differences, reduces user complaints during driving, and improves user experience.

[0038] The following describes in detail the method for verifying the balancing effect of power batteries according to embodiments of the present invention.

[0039] In some embodiments of the present invention, obtaining a first voltage difference set of the power battery within a first preset time before the power battery equalization includes: obtaining the maximum and minimum voltage values ​​of individual cells in the power battery every second preset time; determining the first voltage difference of the power battery based on the maximum and minimum voltage values; and determining a first voltage difference set based on multiple first voltage differences within the first preset time, wherein the first preset time is divided into multiple second preset times, and the second preset times can be calibrated according to actual conditions.

[0040] Specifically, since the power battery comprises multiple individual cells, at regular intervals (a second preset time), the maximum and minimum voltage values ​​of each individual cell are obtained. The maximum voltage value among all individual cells is taken as the maximum voltage value of the power battery, and the minimum voltage value among all individual cells is taken as the minimum voltage value of the power battery. The maximum voltage value minus the minimum voltage value of the power battery is then used as the first voltage difference within the second preset time. The first preset time includes multiple second preset time intervals, thus yielding multiple first voltage differences, which form a set of first voltage differences.

[0041] In some embodiments of the present invention, determining the voltage difference type before the power battery equalization based on the first voltage difference set includes: determining the slope of the fitted straight line based on the first voltage difference set; determining the voltage difference type before the power battery equalization as a voltage difference increasing type when the slope is greater than zero; determining the voltage difference type before the power battery equalization as a voltage difference decreasing type when the slope is less than zero; and determining the voltage difference type before the power battery equalization as a voltage difference stabilizing type when the slope is equal to zero.

[0042] Specifically, after determining the first voltage difference set within a first preset time period through the above embodiments, curve fitting is performed on the first voltage difference set to determine the slope of the fitted line. Then, based on the slope of the fitted line, the voltage difference type of the power battery before equalization can be determined. For example, when the slope of the fitted line is greater than zero, it indicates that the first voltage difference of the power battery gradually increases with time, and the voltage difference type before equalization can be determined to be a voltage difference increasing type. When the slope of the fitted line is less than zero, it indicates that the first voltage difference of the power battery gradually decreases with time, and the voltage difference type before equalization can be determined to be a voltage difference decreasing type. When the slope of the fitted line is zero, it indicates that the first voltage difference of the power battery remains almost unchanged with time, and the voltage difference type before equalization can be determined to be a voltage difference stable type. It should be noted that, to ensure the effectiveness of calculating the slope of the fitted line, the first voltage difference set must contain at least three first voltage differences to more accurately determine the voltage difference type before equalization of the power battery.

[0043] In some embodiments of the present invention, when the slope is greater than zero, the above-mentioned power battery balancing effect verification method further includes: determining that the absolute value of the difference between the maximum and minimum voltage difference values ​​in the first voltage difference set is greater than a first preset threshold, and that the maximum voltage difference value in the first voltage difference set is greater than a second preset threshold. The first and second preset thresholds can be calibrated according to actual conditions.

[0044] Specifically, when the slope of the fitted line is greater than zero, the voltage difference type before the power battery equalization is voltage difference growth type. Considering the influence of different voltage differences of the cells and the extreme difference of self-discharge rate, the judgment condition of voltage difference growth type can be optimized as follows: when the slope of the fitted line is greater than zero, and the absolute value of the difference between the maximum and minimum voltage difference in the first voltage difference set is greater than the first preset threshold, and the maximum voltage difference in the first voltage difference set is greater than the second preset threshold, the power battery before equalization is considered to be voltage difference growth type, excluding the voltage difference caused by the consistency of individual cells.

[0045] In some embodiments of the present invention, when the power battery includes a vehicle power battery, the power battery balancing effect is verified based on the voltage difference type before and after balancing, including: determining the change slope of the power battery before balancing based on a first voltage difference set; determining the change slope of the power battery after balancing based on a second voltage difference set; and verifying the power battery balancing effect based on the change slope of the power battery before and after balancing when the voltage difference type before and after balancing are consistent.

[0046] Specifically, the slope of the power battery before equalization is determined based on the first voltage difference set, and the slope of the power battery after equalization (i.e., the slope of the fitted curve mentioned in the above embodiment) is determined based on the second voltage difference set. Then, the equalization effect of the power battery is verified based on the type of voltage difference before and after equalization and the magnitude of the slope. For example, when the type of voltage difference before and after equalization is the same, such as both being voltage difference increasing type, if the slope of the power battery after equalization is less than the slope of the power battery before equalization and the difference in slopes is greater than a certain value, the power battery equalization effect is considered effective; if the slope of the power battery after equalization is greater than or equal to the slope of the power battery before equalization, or if the slope of the power battery after equalization is less than the slope of the power battery before equalization and the difference in slopes is small, the power battery equalization effect is considered ineffective. As another example, when the type of voltage difference before and after equalization is inconsistent, such as the power battery before equalization being voltage difference increasing type and the power battery after equalization being voltage difference stable type, the power battery equalization effect is considered effective.

[0047] In some embodiments of the present invention, the power battery balancing effect is verified based on the change slope before and after power battery balancing, including: if the change slope is greater than zero, and the change slope after power battery balancing is less than the change slope before power battery balancing, then the power battery balancing effect verification is determined to be effective; if the change slope is less than zero, and the change slope after power battery balancing is greater than the change slope before power battery balancing, then the power battery balancing effect verification is determined to be effective.

[0048] Specifically, assuming the voltage difference type before and after battery equalization remains consistent, the validity of the battery equalization effect verification is determined by the magnitude of the slope of change before and after equalization. For example, if the slope of change before and after equalization is greater than zero, it indicates that the voltage difference type is increasing. If the slope after equalization is less than the slope before equalization, it means the voltage difference gradually decreases after equalization, and the battery equalization effect verification is considered valid. If the slope after equalization is greater than or equal to the slope before equalization, it indicates that the equalization has no effect, and the battery equalization effect verification is considered invalid. Similarly, if the slope of change before and after equalization is less than zero, it indicates that the voltage difference type is decreasing. If the slope after equalization is greater than the slope before equalization, it means the voltage difference gradually decreases after equalization, and the battery equalization effect verification is considered valid. If the slope after equalization is less than or equal to the slope before equalization, it indicates that the equalization has no effect, and the battery equalization effect verification is considered invalid.

[0049] In other embodiments of the present invention, when the power battery includes power batteries of multiple vehicles, the power battery balancing effect is verified based on the voltage difference type before and after power battery balancing, including: obtaining the percentage of each voltage difference type before power battery balancing for all vehicles, and obtaining the percentage of each voltage difference type after power battery balancing for all vehicles; and verifying the power battery balancing effect based on the percentage of each voltage difference type before and after balancing.

[0050] Specifically, when the power battery includes power batteries from multiple vehicles, the first voltage difference set for each power battery is obtained. Based on the first voltage difference set before equalization, the voltage difference type of each power battery is determined, and then the proportion of each voltage difference type is determined. For example, in 100 vehicles, 80 vehicles have a voltage difference type of increasing voltage difference (80%), 10 vehicles have a voltage difference type of decreasing voltage difference (10%), and 10 vehicles have a voltage difference type of stable voltage difference (10%). Similarly, the proportion of each voltage difference type after battery equalization is obtained, and then the proportions of each voltage difference type before and after battery equalization are compared to determine whether the power battery equalization effect is effective. Figure 2 As shown, before balancing, the percentage of cases with decreasing differential pressure was 22.0%, the percentage with stable differential pressure was 0.7%, and the percentage with increasing differential pressure was 77.3%. After balancing, the percentage with decreasing differential pressure was 85.3%, the percentage with stable differential pressure was 2.7%, and the percentage with increasing differential pressure was 12.0%. Taking the increasing differential pressure type as an example, before the balancing scheme was implemented, the percentage with increasing differential pressure was 77.3%, and after the implementation, the percentage with increasing differential pressure was 12.0%, indicating that the balancing scheme was effective. However, even after the implementation, there was still a 12% differential pressure, which suggests that the differential pressure may originate from abnormal self-discharge of the battery cell or module, requiring investigation of the battery cell or module.

[0051] In some embodiments, the equalization upgrade time of each vehicle is obtained, the pressure difference ΔSOC value of the vehicle in each period (one week is one period) within the equalization upgrade time to the latest time period is calculated (the ΔSOC of the latest time in each period is taken), and the slope K value of the fitted line is calculated. The magnitude of the slope K value of the fitted line is determined. K > 0, and the absolute value of MAXΔSOC - MINΔSOC > 1%, and MAXΔSOC ≥ 3%; the ΔSOC change type is pressure difference growth type; K = 0, the ΔSOC change type is pressure difference stability type; K < 0, the ΔSOC change type is pressure difference decrease type. The K value can be retained to 4 decimal places.

[0052] For example, in order to facilitate the statistical analysis of the voltage difference type before and after the power battery equalization, it is necessary to output data that meets the conditions for multiple vehicles, including VIN (Vehicle Identification Number), version number before equalization, recording time of the first voltage difference ΔSOC1 before equalization, recording time of the first voltage difference ΔSOC1 before equalization, recording time of the second voltage difference ΔSOC2 before equalization, recording time of the third voltage difference ΔSOC3 before equalization, recording time of the third voltage difference ΔSOC3 before equalization, slope K value of the fitted line before equalization, voltage difference type before equalization, version number after equalization, recording time of the first voltage difference ΔSOC1 after equalization, recording time of the first voltage difference ΔSOC1 after equalization, recording time of the second voltage difference ΔSOC2 after equalization, recording time of the second voltage difference ΔSOC2 after equalization, recording time of the third voltage difference ΔSOC3 after equalization, ..., latest update recording time after equalization, latest update third voltage difference ΔSOC3 after equalization, slope K value of the fitted line after equalization, and voltage difference type after equalization.

[0053] In summary, the power battery balancing effect verification method according to embodiments of the present invention obtains a first voltage difference set of the power battery within a first preset time period before balancing, and determines the voltage difference type before balancing based on the first voltage difference set. It then obtains a second voltage difference set of the power battery within a first preset time period after balancing, and determines the voltage difference type after balancing based on the second voltage difference set. Finally, it verifies the power battery balancing effect based on the voltage difference types before and after balancing. Therefore, this method can identify the source of voltage difference and verify the power battery balancing effect based on the voltage difference types before and after balancing, reducing after-sales maintenance costs and improving user experience.

[0054] Corresponding to the above embodiments, the present invention also proposes a power battery balancing effect verification device.

[0055] like Figure 3 As shown, the power battery equalization effect verification device 100 of this embodiment may include: a first acquisition module 110, a first determination module 120, a second acquisition module 130, a second determination module 140 and a verification module 150.

[0056] The first acquisition module 110 is used to acquire a first voltage difference set of the power battery within a first preset time period before power battery equalization. The first determination module 120 is used to determine the voltage difference type before power battery equalization based on the first voltage difference set. The second acquisition module 130 is used to acquire a second voltage difference set of the power battery within a first preset time period after power battery equalization. The second determination module 140 is used to determine the voltage difference type after power battery equalization based on the second voltage difference set. The verification module 150 is used to verify the power battery equalization effect based on the voltage difference type before and after power battery equalization.

[0057] In some embodiments of the present invention, the first acquisition module 110 acquires a set of first voltage differences of the power battery within a first preset time before the power battery equalization, specifically used for: acquiring the maximum and minimum voltage values ​​of individual cells in the power battery every second preset time; determining the first voltage difference of the power battery based on the maximum and minimum voltage values; and determining a set of first voltage differences based on multiple first voltage differences within the first preset time, wherein the first preset time is divided into multiple second preset times.

[0058] In some embodiments of the present invention, the first determining module 120 determines the voltage difference type before the power battery is balanced based on the first voltage difference set, specifically used for: determining the slope of the fitted straight line based on the first voltage difference set; when the slope is greater than zero, determining that the voltage difference type before the power battery is balanced is a voltage difference increasing type; when the slope is less than zero, determining that the voltage difference type before the power battery is balanced is a voltage difference decreasing type; and when the slope is equal to zero, determining that the voltage difference type before the power battery is balanced is a voltage difference stabilizing type.

[0059] In some embodiments of the present invention, when the slope is greater than zero, the first determining module 120 is further configured to: determine that the absolute value of the difference between the maximum voltage difference and the minimum voltage difference in the first voltage difference set is greater than a first preset threshold, and that the maximum voltage difference in the first voltage difference set is greater than a second preset threshold.

[0060] In some embodiments of the present invention, when the power battery includes a vehicle power battery, the verification module 150 verifies the power battery balancing effect based on the voltage difference type before and after power battery balancing. Specifically, it is used to: determine the change slope of the power battery before balancing based on a first voltage difference set; determine the change slope of the power battery after balancing based on a second voltage difference set; and verify the power battery balancing effect based on the change slope of the power battery before and after balancing when the voltage difference type before and after power battery balancing are consistent.

[0061] In some embodiments of the present invention, the verification module 150 verifies the power battery balancing effect based on the change slope before and after power battery balancing. Specifically, it is used to: if the change slope after power battery balancing is less than the change slope before power battery balancing when the change slope is greater than zero, then the power battery balancing effect verification is determined to be valid; if the change slope after power battery balancing is greater than the change slope before power battery balancing when the change slope is less than zero, then the power battery balancing effect verification is determined to be valid.

[0062] In other embodiments of the present invention, when the power battery includes power batteries of multiple vehicles, the verification module 150 verifies the power battery balancing effect based on the voltage difference type before and after power battery balancing. Specifically, it is used to: obtain the percentage of each voltage difference type before power battery balancing for all vehicles, and obtain the percentage of each voltage difference type after power battery balancing for all vehicles; and verify the power battery balancing effect based on the percentage of each voltage difference type before and after balancing.

[0063] It should be noted that for details not disclosed in the power battery balancing effect verification device of the present invention, please refer to the details disclosed in the power battery balancing effect verification method of the present invention, and will not be repeated here.

[0064] According to an embodiment of the present invention, a power battery balancing effect verification device comprises a first acquisition module acquiring a first voltage difference set of the power battery within a first preset time period before balancing, a first determination module determining the voltage difference type before balancing based on the first voltage difference set, a second acquisition module acquiring a second voltage difference set of the power battery within a first preset time period after balancing, a second determination module determining the voltage difference type after balancing based on the second voltage difference set, and a verification module verifying the power battery balancing effect based on the voltage difference type before and after balancing. Thus, the device can identify the source of voltage difference and verify the power battery balancing effect based on the voltage difference type before and after balancing, reducing after-sales maintenance costs and improving user experience.

[0065] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0066] The present invention provides a computer-readable storage medium storing a power battery balancing effect verification program thereon, which, when executed by a processor, implements the aforementioned power battery balancing effect verification method.

[0067] The computer-readable storage medium of this invention, by executing the above-described power battery balancing effect verification method, can identify the source of voltage difference and verify the power battery balancing effect according to the type of voltage difference before and after power battery balancing, thereby reducing after-sales maintenance costs and improving user experience.

[0068] Corresponding to the above embodiments, the present invention also proposes a vehicle.

[0069] like Figure 4 As shown, the vehicle 200 of this embodiment includes a memory 210, a processor 220, and a power battery balancing effect verification program stored in the memory 210 and run on the processor 220. When the processor 220 executes the power battery balancing effect verification program, it implements the above-mentioned power battery balancing effect verification method.

[0070] According to the vehicle of the present invention, by performing the above-described power battery balancing effect verification method, the source of voltage difference can be identified, and the power battery balancing effect can be verified according to the type of voltage difference before and after power battery balancing, thereby reducing after-sales maintenance costs and improving user experience.

[0071] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0072] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0073] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for verifying the balancing effect of a power battery, characterized in that, The method includes: Obtain the first voltage difference set of the power battery within a first preset time before the power battery equalization, and determine the voltage difference type of the power battery before equalization based on the first voltage difference set; Obtain the second voltage difference set of the power battery within a first preset time after the power battery is balanced, and determine the voltage difference type of the power battery after balancing based on the second voltage difference set; The balancing effect of the power battery is verified based on the type of voltage difference before and after the balancing of the power battery. Determining the voltage difference type of the power battery before equalization based on the first voltage difference set includes: determining the slope of the fitted straight line based on the first voltage difference set; if the slope is greater than zero, determining the voltage difference type of the power battery before equalization as a voltage difference increasing type; if the slope is less than zero, determining the voltage difference type of the power battery before equalization as a voltage difference decreasing type; and if the slope is equal to zero, determining the voltage difference type of the power battery before equalization as a voltage difference stabilizing type. When the slope is greater than zero, the method further includes: determining that the absolute value of the difference between the maximum voltage difference and the minimum voltage difference in the first voltage difference set is greater than a first preset threshold, and that the maximum voltage difference in the first voltage difference set is greater than a second preset threshold.

2. The method for verifying the balancing effect of a power battery according to claim 1, characterized in that, Obtaining the first voltage difference set of the power battery within a first preset time period before the power battery equalization includes: The maximum and minimum voltage values ​​of individual cells in the power battery are obtained every second preset time interval; The first voltage difference of the power battery is determined based on the maximum and minimum voltage values. The first voltage difference set is determined based on multiple first voltage differences within the first preset time period, wherein the first preset time period is divided into multiple second preset time periods.

3. The method for verifying the balancing effect of a power battery according to claim 1, characterized in that, When the power battery includes a vehicle's power battery, the power battery balancing effect is verified based on the voltage difference type before and after balancing, including: The slope of the power battery before equalization is determined based on the first voltage difference set. The slope of the power battery after equalization is determined based on the second voltage difference set. When the voltage difference type before and after the power battery equalization are the same, the power battery equalization effect is verified based on the change slope before and after the power battery equalization.

4. The method for verifying the balancing effect of a power battery according to claim 3, characterized in that, The power battery balancing effect is verified based on the slope of change before and after balancing, including: If the slope of change is greater than zero, and the slope of change after the power battery equalization is less than the slope of change before the power battery equalization, then the power battery equalization effect is determined to be effective. If the slope of change is less than zero, and the slope of change after the power battery is balanced is greater than the slope of change before the power battery is balanced, then the power battery balancing effect is verified as effective.

5. The method for verifying the balancing effect of a power battery according to claim 1, characterized in that, When the power battery includes power batteries from multiple vehicles, the power battery balancing effect is verified based on the voltage difference type before balancing and the voltage difference type after balancing, including: Obtain the percentage of each type of voltage difference before the power battery equalization for all vehicles, and obtain the percentage of each type of voltage difference after the power battery equalization for all vehicles; The balancing effect of the power battery was verified by the proportion of each type of pressure difference before balancing and the proportion of each type of pressure difference after balancing.

6. A power battery balancing effect verification device, characterized in that, include: The first acquisition module is used to acquire the first voltage difference set of the power battery within a first preset time before the power battery is balanced. The first determining module is used to determine the type of voltage difference before the power battery is balanced based on the first voltage difference set. The second acquisition module is used to acquire the second voltage difference set of the power battery within a first preset time after the power battery is balanced. The second determining module is used to determine the type of voltage difference after the power battery is balanced based on the second voltage difference set. The verification module is used to verify the balancing effect of the power battery based on the voltage difference type before and after the balancing of the power battery. The first determining module determines the voltage difference type before the power battery equalization based on the first voltage difference set, specifically: determining the slope of the fitted line based on the first voltage difference set; when the slope is greater than zero, determining the voltage difference type before the power battery equalization as voltage difference increasing type; when the slope is less than zero, determining the voltage difference type before the power battery equalization as voltage difference decreasing type; when the slope is equal to zero, determining the voltage difference type before the power battery equalization as voltage difference stabilizing type. When the slope is greater than zero, the first determining module is further configured to: determine that the absolute value of the difference between the maximum voltage difference and the minimum voltage difference in the first voltage difference set is greater than a first preset threshold, and that the maximum voltage difference in the first voltage difference set is greater than a second preset threshold.

7. A computer-readable storage medium, characterized in that, It stores a power battery balancing effect verification program, which, when executed by the processor, implements the power battery balancing effect verification method according to any one of claims 1-5.

8. A vehicle, characterized in that, The device includes a memory, a processor, and a power battery balancing effect verification program stored in the memory and executable on the processor. When the processor executes the power battery balancing effect verification program, it implements the power battery balancing effect verification method according to any one of claims 1-5.

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