Patent ID: 8883341

Claim:
A battery comprising a battery case, an electrode group housed in the battery case in a hermetically sealed manner, and an external terminal electrically connected to an electrode body of the electrode group and exposed to outside of the battery case, wherein the battery comprises: a terminal rivet including a columnar rivet portion, a base portion provided at a base end of the rivet portion, and a current collecting part connected to the electrode body of the electrode group, a surface of the base portion provided with the rivet portion having a sloped seat surface with a height increasing toward the rivet portion and the raised seat surface being formed over an entire circumference of the rivet portion; an annular elastic member; and an insulation spacer having higher hardness than the elastic member, the insulation spacer being formed with a first hole having a diameter larger than an outer diameter of the elastic member and smaller than an outer diameter of the sloped seat surface, the battery case is formed with a second hole through which the rivet portion is inserted, the terminal rivet is placed such that the base portion and the current collecting part are located inside the battery case and the rivet portion passes through the second hole and protrudes out of the battery case, the insulation spacer is placed so that the elastic member is located in the first hole and the insulation spacer is sandwiched between the base portion and the battery case, the rivet portion is riveted so that the external terminal is fixed to the battery case and electrically connected to the terminal rivet, and the elastic member is compressed in a thickness direction between the base portion and the battery case.