Abnormal welding detection method and device for battery system

The invention provides a battery system abnormal welding detection method and device, and relates to the technical field of battery detection. The method comprises the following steps: if all battery cells and aluminum bars in the battery system have no first abnormity, detecting the welding positions of all battery cells and aluminum bars in the battery system; if the welding positions of all the battery cells and the aluminum row in the battery system have no second abnormity, a first parameter of the battery system is obtained, and the first parameter is used for measuring whether the welding positions of the battery cells and the aluminum row are qualified or not; if the first parameter of the battery system is not within the preset range, it is judged that welding abnormity exists in the battery system, and therefore when the battery system is abnormal in the using process, under the condition that the welding position of the battery cell and the aluminum row is not damaged, detection of the welding posi