The present disclosure provides a battery module, which comprises: a plurality of mono-batteries, each mono-battery has electrode terminals which are opposite in electrical polarity; and an electrical connection sheet connecting at least two corresponding electrode terminals, the electrical connection sheet is formed with at least one fusing portion, each fusing portion is positioned between two adjacent electrode terminals. The battery module further comprises: an insulating sheet supported on the fusing portion which is positioned between the two adjacent electrode terminals connected by the electrical connection sheet, when the fusing portion supporting the insulating sheet is fused and a fracturing slit is formed, the insulating sheet drops into the fracturing slit to electrically isolate two facing sides of the electrical connection sheet which are at the fracturing slit. Therefore it avoids the phenomenon of an electrical arc occurring at the fracturing slit and makes the electrical arc extinct.