Patent ID: 9692021
Date: 2017-06-27
CPC Classifications: H01G,H01M,Y02E,Y02T

Claim:
1. An electrical storage device comprising: a case having a through hole, wherein the case includes a case body and a lid in which the through hole is arranged; an electrode assembly accommodated in the case; 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 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 arranged to pass from an inside of the case through the through hole and protrudes to an outside of the case; a terminal insulating member, which is inserted between an inner circumferential surface of the through hole and an outer circumferential surface of the polar column portion, which faces the inner circumferential surface, wherein the terminal insulating member includes a circumferential wall which surrounds the polar column portion; and an annular sealing member sandwiched between an inner surface of the lid and a seat surface of the base, which faces the inner surface of the lid, wherein a tip end of the terminal insulating member on a side corresponding to the seat surface of the base has a tapered portion, and a cross-sectional shape of the tapered portion in a direction in which the base and the case inner surface face each other is inclined to the outside in a radial direction of the through hole from the side corresponding to the base toward the through hole, wherein the tapered portion is located between an inner circumferential edge of the sealing member and an outer circumferential surface of the polar column portion, and wherein the sealing member surrounds at least one of the tapered portion and the circumferential wall of the terminal insulating member.