Method for judging abnormal voltage of battery pack cell
A technology of abnormal voltage and battery pack, applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc., it can solve the problems of comparing the voltage difference of different cells, difficult, and the battery voltage changes greatly, and achieves easy promotion, Improve stability and high accuracy
Pending Publication Date: 2022-01-18
力高(山东)新能源技术股份有限公司
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Problems solved by technology
However, due to the influence of current, the voltage of the battery varies greatly, so that it is difficult to directly compare the difference between the voltages of different cells
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Embodiment 1
[0025] Such as figure 1 As shown, a method for judging the abnormal voltage of a battery cell includes the following steps:
[0026] S1. Collect each piece of voltage data of the battery cell, take one piece of voltage data, and judge the time interval between the piece of voltage data and the collection of the first voltage data. When the time interval is less than T 0 , it is judged whether all the voltage data in the voltage data are invalid, if so, discard the entire data, if not, then the voltage data is the first voltage data;
[0027] S2. Calculate the voltage median V of the first voltage data med , and calculate the highest voltage V max vs. median voltage V med The difference ΔV max , ΔV max =V max -V med , and the highest voltage V max with a minimum voltage of V min Difference ΔV, ΔV=V max -V min ;
[0028] S3. Calculate the difference ratio r of the first voltage data, and repeat the above operation until T 0 Traverse all the voltage data collected in...
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The invention relates to a method for judging abnormal voltage of a battery pack cell, the method comprises the following steps: acquiring each piece of voltage data of the battery pack cell, extracting first voltage data, calculating the median of the first voltage data, and calculating the voltage difference between the median and the highest / lowest voltage according to the median, calculating a voltage difference ratio of each piece of first voltage data based on an invalid value, a voltage difference and a voltage difference threshold value of the voltage data, calculating the median of the voltage difference ratio, comparing the median with a voltage difference threshold value, judging whether the voltage of the battery cell is too high / too low or not, if so, calculating the probability that each single battery cell becomes the highest / lowest voltage single battery cell within a certain time period, and judging the single battery cell with abnormal voltage in combination with a probability threshold. According to the method, the battery voltage difference which is difficult to compare directly is converted into a value between 0 and 1 through a normalization method, so that the battery voltages at different moments can be compared, and the stability of the result is improved through a statistical method.
Description
technical field [0001] The invention belongs to the technical field of power batteries for electric vehicles, and in particular relates to a method for judging the abnormal voltage of battery cell cells. Background technique [0002] With the rapid development of the new energy vehicle industry, the safety of power batteries has received more and more attention. A large number of experiments have shown that the safety problem of the power battery does not appear suddenly, and there is a process from quantitative change to qualitative change. If the problem is discovered in advance and actively intervenes in the process of battery safety deterioration, it can be delayed to a large extent. Even prevent problems from happening and improve the safety of new energy vehicles. [0003] As one of the important characteristics of the battery, the voltage of the battery can indirectly reflect the safety status of the battery: if the voltage performance of a cell in the battery pack i...
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IPC IPC(8): G01R19/165G01R31/36G01R31/396
CPCG01R19/16542G01R19/16576G01R31/396G01R31/3648
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