ELECTRICAL STORAGE DEVICE

摘要

An electrical storage device includes a case, an electrode assembly accommodated in the case, an electrode terminal, a terminal insulating member, and an annular sealing member. The electrode terminal has a base located inside the case and a polar column portion, which projects from the base. An inner surface of the case at the circumference of the through hole and/or a tip end of the terminal insulating member on the side corresponding to the base has a tapered portion. A cross-sectional shape of the tapered portion in a direction in which the base and the inner surface face of the case each other is inclined to the outside in the radial direction of the through hole from the side corresponding to the base toward the through hole.

主权项

1. An electrical storage device comprising:
a case having a through hole, through which an electrode terminal passes; 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; and an annular sealing member sandwiched between an inner surface of the case and a seat surface of the base, which faces the inner surface, wherein at least one of the inner surface of the case at a circumference of the through hole and a tip end of the terminal insulating member on a side corresponding to 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, and 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.