Electrical storage device

摘要

An electrical storage device includes a case body having an opening, a lid, which closes the opening and has a through hole, an electrode assembly accommodated in the case body, and an electrode terminal. The electrode terminal has a base and a polar column portion, which projects from the base and shaped to pass from the inside of the case body through the through hole and protrude to the outside. A sealing member is sandwiched between the inner surface of the lid and a seat surface of the base. In a root portion of the polar column portion coupled to the base, in at least a part of the polar column portion around an axis thereof, a tapered portion, which spreads in the cross-sectional shape toward the base along the axis of the polar column portion, is provided. The sealing member is arranged radially outside of the tapered portion.

主权项

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.