Method for judging battery cell abnormity of battery pack
A technology of battery packs and battery cells, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of battery manufacturing process not meeting the ideal requirements, battery leakage, and endangering driving safety, etc., so as to facilitate computer automatic judgment, Achieve simple, easy-to-scale effects
Active Publication Date: 2021-12-17
力高(山东)新能源技术股份有限公司
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Problems solved by technology
Due to the fact that the battery manufacturing process does not meet the ideal requirements and the temperature distribution of the battery pack is uneven, the states of different batteries in the same vehicle cannot be completely consistent.
If it cannot be identified in time after the abnormality of the battery cell, with the use of the vehicle, the battery cell problem of the battery pack will become more and more serious, and even cause problems such as car crashes and battery leakage, which will endanger driving safety
Method used
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Embodiment 1
[0032] Such as Figure 1-3 As shown, a method for judging the abnormality of a battery cell includes the following steps:
[0033] S1. Use a constant current to charge the battery pack to full charge, obtain the voltage data V of each battery cell i during the charging process, and record the power Q charged into the battery pack at the same time;
[0034] S2. For each cell i, calculate based on V and Q value, and build The corresponding relationship with V; the specific method is:
[0035] S21, calculate the voltage interval where V max is the maximum voltage that occurs during the entire charging process, V min is the minimum voltage value that occurs during the entire charging process, and M is the number of intervals. All the voltage data V of each cell i obtained in step S1 during the charging process is divided into M interval voltage data sets, and the interval nodes are respectively V min , V min +ΔV, V min +2ΔV,...,V max -ΔV, V max ;
[0036] S22. Calcu...
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The invention relates to a method for judging battery cell abnormity of a battery pack. The method comprises the following steps of S1, charging a battery pack till that the battery pack is fully charged, and recording voltage data V of each battery cell and the charged electric quantity Q of the battery pack in the charging process; S2, calculating the value of each battery cell, establishing a corresponding relationship with V, and correspondingly obtaining a voltage according to the maximum value of each battery cell; S3, calculating the median Vmed of all battery cells, and calculating a conversion median absolute deviation CMAD based on the Vmed; and S4, comparing each cell with a larger value in the K-time CMAD and the voltage threshold V0, wherein the larger cell is an abnormal cell, and otherwise, the larger cell is a normal cell. According to the method, a charging voltage curve which is difficult to compare is converted into a visual curve through a differential method, and the difference between different battery cell charging curves is quantified through a method for calculating and converting the absolute deviation of the median so that automatic judgment of a computer is facilitated.
Description
technical field [0001] The invention belongs to the field of power batteries for electric vehicles, and in particular relates to a method for judging the abnormality of battery cell cells. Background technique [0002] As the core component of new energy vehicles, power batteries are directly related to the safe and stable driving of vehicles. Due to the fact that the battery manufacturing process does not meet the ideal requirements and the temperature distribution of the battery pack is uneven, the states of different battery cells in the same vehicle cannot be completely consistent. If it cannot be identified in time after the abnormality of the battery cell, with the use of the vehicle, the battery cell problem of the battery pack will become more and more serious, and even cause problems such as car crashes and battery leakage, which will endanger driving safety. [0003] For abnormal cells, some characteristic curves in the charging stage are obviously different from ...
Claims
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IPC IPC(8): G01R31/385G01R31/387
CPCG01R31/385G01R31/387
Inventor 沈永柏王翰超王云姜明军孙艳刘欢江梓贤
Owner 力高(山东)新能源技术股份有限公司