BATTERY CASE

摘要

The present invention provides a battery including a case and a battery cell accommodated in the case. The case is divided in a thicknesswise direction of the battery cell into an upper case (12) and a lower case (14). The cases have joint portions (1201, 1401) formed along peripheries thereof for jointing with each other. The joint portion of the lower case (14) has a joining thin wall formed to extend along a periphery thereof and project in the thicknesswise direction. The joint portion of the upper case (12) has a joining recess formed to extend along a periphery thereof for receiving the joining thin wall inserted therein. The joining thin wall and the joining recess in which the joining thin wall is inserted are joined together by welding. The upper case (12) has a projecting wall (1002) formed at a location of an outer face thereof positioned on the outer side of the joining recess in such a manner as to extend along the joining recess.