Battery module and manufacturing method thereof

The invention provides a battery module and a manufacturing method thereof. The battery module comprises a plurality of battery cells, a plurality of metal sheets, a circuit board and solder. The metal sheet is electrically connected with the battery cell. Each metal sheet comprises a metal bump, and the metal bump is provided with an upper surface. The circuit board is disposed on the metal sheet and has a plurality of openings. The metal bumps of each metal sheet are respectively exposed out of the openings. Each opening area is divided into a first groove and a second groove by the metal bumps. The solder covers the upper surface of the metal bump of each metal sheet and each opening. The first groove is filled with the solder, and an air gap is stored in the second groove. The battery module and the manufacturing method thereof can have better structural reliability, and can effectively reduce the welding time and the use amount of soldering tin. 本发明提供一种电池模块及其制作方法。电池模块包括多个电池芯、多个金属片、电路板以及焊料。金属片电性连接电池芯。每一金属