Battery

摘要

A battery includes current collectors for electrically connecting a power generating element contained inside of a battery case to external terminals, respectively. A caulking head of a rivet for fixing the negative current collector to a cover is contained in a engagement recess which is a space inside of a engagement receiving portion in the cover. The positive current collector is caulked to the cover via a shaft of the positive external terminal. A caulking head at a tip end of the shaft is contained in the engagement recess which is a space defined inside of the engagement receiving portion. The caulking heads do not project from a lower surface of the cover, and therefore, a clearance space defined between the power generating element and the cover is set to the minimum.

主权项

1. A battery, comprising:
a battery case which contains a power generating element therein and whose top surface is opened; a cover which covers the top surface of the battery case and includes an expanding portion that is formed as a part of the cover expanding upward from an upper surface of the cover, a bottom surface of the cover being formed with a recess that includes a space inside of the expanding portion; an external terminal, at least part of the external terminal being disposed outside of the cover; a current collector which electrically connects the power generating element to the external terminal, the current collector comprising a base and a leg, the base comprising a caulked portion, the leg being connected to the power generating element; and a joining member which fixes the caulked portion to the cover, wherein the caulked portion and a head of the joining member are contained in the recess, and wherein the head of the joining member caulks the caulked portion for fixing the current collector to the cover.