The invention relates to a
lithium ion battery internal
short circuit detection method based on an improved GAF, and belongs to the field of
lithium battery detection, and the method comprises the steps: amplifying a
voltage deviation through a curve Manhattan distance, selecting a reference curve to divide all curves, and calculating the curve Manhattan distance between an internal
short circuit curve and the reference curve through a sliding window; converting the one-dimensional data into a two-dimensional image through an improved Grubrum angle field; according to an application scene, the severity of the
short circuit is divided into z classes, z Grubrum angle field image data sets are correspondingly constructed, a model is used for classifying the image data sets, and the possibility of each class is obtained according to the probability corresponding to a
classification result. According to the method, the Manhattan distance of the curve is calculated by using the sliding window, the
voltage deviation characteristic is amplified, and the time characteristic of data is reserved; by improving the Grubm angle field, images with different internal short circuit degrees show different contour features, and the internal
short circuit fault of the battery can be effectively detected and tracked.