Patent ID: 7659029

Claim:
A battery module comprising: a plurality of flat cells having a package member sealing a power generating element and an electrode tab extending from the package member, the plurality of the flat cells being stacked and the electrode tabs of the flat cells positioned adjacent to each other in a stacking direction to be connected electrically; and paired insulating plates nipping the electrode tab on opposite surface sides of the electrode tab along the stacking direction of the plurality of the flat cells and possessing an electric insulating property, wherein the paired insulating plates nipping the electrode tab are provided with an engaging member adapted to fasten the electrode tab by passing through the electrode tab along the stacking direction, wherein the electrode tab is provided with a through hole along the stacking direction, and wherein the engaging member is provided with a projecting part configured to be inserted into the through hole, wherein the engaging member is provided in at least one of the paired insulating plates, and a concave part provided in at least one of the paired insulating plates is configured to permit insertion therein of the leading end of the projecting part inserted in the through hole, wherein the leading end of the projecting part does not completely penetrate the insulating plate having the concave part.