Patent ID: 7781096
Filing Date: 2010-08-24
Classification: H01M,Y02E

Abstract:
1. A battery comprising: a case; and a battery cell accommodated in said case; wherein said case is divided in a thicknesswise direction of said battery cell into a first case and a second case; said first and second cases have joint portions for jointing with each other; the joint portion of one of said first and second cases has a joining thin wall formed to extend along a periphery of the joint portion and project in the thicknesswise direction; the joint portion of the other of said first and second cases has a joining recess formed to extend along a periphery of the joint portion for receiving said joining thin wall inserted therein in a state that said joint portions of said first and second cases joint with each other; said joining thin wall and said joining recess in which said joining thin wall is inserted while said joint portions of said first and second cases joint with each other are joined together by welding; and said the other case has a projecting wall formed at a location of an outer face positioned on the outer side of said joining recess in such a manner as to extend along said joining recess.