Lithium battery internal short circuit processing method and device

The embodiment of the invention provides a lithium battery internal short circuit processing method and device. The method comprises the steps that in the effective charging process of a lithium battery system, the maximum voltage drop value is determined, the maximum voltage drop value is the maximum value of the voltage difference value of a single battery in the lithium battery system between the first moment and the second moment, and the first moment is earlier than the second moment; if the maximum voltage drop value is greater than 0, judging whether the maximum voltage drop value is greater than a preset threshold value or not, and if so, determining that the lithium battery is internally short-circuited and generating alarm information of different levels; and determining a corresponding control measure according to the level of the alarm information. The internal short-circuit fault and the corresponding level of the battery can be quickly judged according to the voltage dropcondition of the single