Recognition method of micro-short circuiting of batteries

The invention provides a recognition method of micro-short circuiting of batteries. Whether a series-connected battery pack has micro-short circuiting, which specific battery cell has micro-short circuiting and what time micro-short circuiting occurs can be judged by judging whether an off-group point exists in voltage derivative or voltage differential of each battery cell of the series-connected battery pack at the same time, and the condition that micro-short circuiting is internal short circuiting or external short circuiting can be distinguished with an information entropy judgment method. The recognition method of micro-short circuiting of the batteries plays a key role on safety improvement of products, such as an electric car and an airplane, utilizing the power battery pack.