Secondary battery and secondary battery module

摘要

A secondary battery includes a battery casing accommodating an electricity-generating element group, and a battery cover having through-holes and sealing an opening in the battery casing. A first face at one end of each of positive and negative electrode connecting plates, which are each formed from a single plate of metal, is connected to a non-coated section of the electricity-generating element group. A second face at the other end of each of the positive and negative electrode connecting plates is a face onto which a busbar is welded, and the second face is exposed outward from one of the through-holes. Insulating base materials are interposed between THE positive and negative electrode connecting plates and an outer circumference of each through-hole, the insulating base materials and the battery cover are connected by brazing, and the insulating base materials and the positive and negative electrode connecting plates are connected by brazing.

主权项

1. A secondary battery comprising:
an electricity-generating element group formed by stacking in layers via separators a positive electrode connecting plate coated with a positive electrode active material, and a negative electrode connecting plate coated with a negative electrode active material, the electricity-generating element group further including portions, of the positive electrode plate and negative electrode plate, that are not coated with the positive electrode active material or negative electrode active material; a battery container accommodating the electricity-generating element group; a positive electrode external terminal and a negative electrode external terminal, each exposed outward from one of two through-holes, one for a positive electrode and the other for a negative electrode, in the battery container in order to conduct electric power charging/discharging between the electricity-generating element group and an external load; and an insulating base material disposed in close contact with an entire edge surface of each through-hole and with entire wall surfaces of the positive and negative electrode terminals at the positive and negative electrode connecting plates, wherein: the positive electrode connecting plate and the negative electrode connecting plate are each fabricated from a single blank material; an electricity-generating element connection portion connected to the electricity-generating element group is formed on a first face at one end of each of the positive and negative electrode connecting plates; the positive or negative electrode external terminal is formed on a second face at the other end of each of the connecting plates; the second faces of the positive and negative electrode connecting plates are exposed from the through-holes in parallel to an outer surface of the battery container; the battery container includes a battery casing and a battery cover sealing an opening in the battery casing, the battery cover including the through-hole for the positive electrode and the through-hole for the negative electrode; and the insulating base material covers upper and lower surfaces of the battery cover and seals the battery cover.