Patent ID: 9583743
Date: 2017-02-28
CPC Classifications: H01G,H01M,Y02E,Y02T

Claim:
1. An electrical storage device comprising: a case body, which has an opening; a lid, which closes the opening and has a through hole; an electrode assembly accommodated in the case body; an electrode terminal, which passes through the through hole and is electrically connected to the electrode assembly, wherein the electrode terminal includes a base, which is located in the case body and has a cross-sectional area that is greater than an area of the through hole, and a polar column portion, which projects from the base and is shaped to pass from an inside of the case body through the through hole and protrude to an outside; an annular sealing member sandwiched between an inner surface of the lid, which faces the case body, and a seat surface of the base, which faces the inner surface; a tapered portion provided in at least a root portion coupled to the base of the polar column portion in at least a part of the polar column portion around an axis of the polar column portion, wherein the tapered portion spreads in a cross-sectional shape toward the base along the axis of the polar column portion, and the sealing member is arranged radially outside at a position of the tapered portion; and an insulating cover, which insulates the inner surface of the lid from the seat surface of the base, wherein the insulating cover includes a through portion for the polar column portion, and in a radial direction of the polar column portion, the sealing member is arranged inside of the through portion.