PRISMATIC SEALED SECONDARY BATTERY

摘要

The positive electrode substrate exposed portions or the negative electrode substrate exposed portions, or both, of an electrode assembly is split into two groups, and therebetween is disposed an intermediate member made of a resin material and holding one or more connecting conductive members. Collector members for the substrate exposed portions split into two groups is electrically joined by a resistance welding method to the substrate exposed portions split into two groups, together with the connecting conductive member(s) of the intermediate member. The resin material portion of the intermediate member protrudes, in the extension direction of the substrate exposed portions split into two groups, beyond the ends of the substrate exposed portions split into two groups and the ends of the collector member to a prismatic outer can. This structure enables enhanced resistance between the substrate exposed portions and the collector member and curbs variation in the welding strength.

主权项

1. A prismatic sealed secondary battery comprising:
an electrode assembly comprising
positive electrode substrate exposed portions including a first group and a second group, andnegative electrode substrate exposed portions; a resin material disposed between the first group and the second group; a positive collector member that is electrically joined to the positive electrode substrate exposed portions; a negative collector member that is electrically joined to the negative electrode substrate exposed portions; a prismatic outer can into which the electrode assembly is inserted, the prismatic outer can including a mouth portion, a bottom, a first side surface, and a second side surface; and a sealing plate sealing the mouth portion of the prismatic outer can; wherein the first side surface of the prismatic outer can is perpendicular to the bottom of the prismatic outer can; wherein the second side surface of the prismatic outer can is perpendicular to the bottom of the prismatic outer can; wherein the first side surface of the prismatic outer can and the second side surface of the prismatic outer can are parallel to each other; wherein the positive electrode substrate exposed portions are arranged on the first side surface side of the prismatic outer can; wherein the negative electrode substrate exposed portions are arranged on the second side surface side of the prismatic outer can; wherein a distance from the first side surface of the prismatic outer can to a portion of the resin material which is nearest to the first side surface of the prismatic outer can is less than a distance from the first side surface of the prismatic outer can to a portion of the first group of positive electrode substrate exposed portions which is nearest to the first side surface of the prismatic outer can; wherein the distance from the first side surface of the prismatic outer can to the portion of the resin material which is nearest to the first side surface of the prismatic outer can is less than a distance from the first side surface of the prismatic outer can to a portion of the second group of positive electrode substrate exposed portions which is nearest to the first side surface of the prismatic outer can; and wherein the distance from the first side surface of the prismatic outer can to the portion of the resin material which is nearest to the first side surface of the prismatic outer can is less than a distance from the first side surface of the prismatic outer can to a portion of the positive collector member which is nearest to the first side surface of the prismatic outer can.