SECONDARY BATTERY AND BATTERY SYSTEM

摘要

Disclosed is a secondary battery comprising a rectangular battery can (1) provided with a positive electrode terminal and a negative electrode terminal; an electrode group which is arranged within the rectangular battery can and has a structure wherein a sheet-like positive electrode (2) electrically connected to the positive electrode terminal and a sheet-like negative electrode (3) electrically connected to the negative electrode terminal are laminated through a separator; a fixing tape (9); and a first and second insulating auxiliary sheet (8) each comprising a first portion having substantially the same width with the electrode group in the longitudinal direction of a surface of the rectangular battery can on which the positive electrode terminal and the negative electrode terminal are formed, and a second portion having a wider width than the electrode group in the longitudinal direction, with the center of the second portion being on substantially the same perpendicular line as the center of the first portion in the longitudinal direction with respect to the surface of the rectangular battery can on which the positive electrode terminal and the negative electrode terminal are formed.