Secondary battery, method for manufacturing same, and heat-sealable insulating film for secondary battery

摘要

A secondary battery includes an outer housing and an electrode body including a positive electrode member, separator member and a negative electrode member stacked in this order wherein the positive electrode member and the negative electrode member are formed from a collector and an active material layer formed to cover one end on the collector, an insulating body in which an insulating material that does not exhibit adhesiveness at room temperature is adhered with an adhesive strength of 1 N/15 mm or greater onto the collector constituting the positive electrode member or the negative electrode member, and a peripheral edge of the positive electrode member or the negative electrode member has a cross-sectional surface including the collector and the insulating body.

主权项

1. A secondary battery comprising an outer housing and an electrode body comprising a positive electrode member, a separator member and a negative electrode member stacked in this order,
wherein the positive electrode member and the negative electrode member are formed from a collector and an active material layer formed to cover one end on the collector, an insulating body in which an insulating material that does not exhibit an adhesiveness at room temperature of an adhesive strength of 1 N/15 mm or greater onto the collector constituting the positive electrode member or the negative electrode member, and a peripheral edge of another end on the collector of the positive electrode member or the negative electrode member has a cross-sectional surface including the collector and the insulating body formed on the active material layer and the collector, the insulating body is made of a heat-sealable insulating film having a base material layer and a heat-sealable layer made of a polyolefin modified with an unsaturated carboxylic acid or a derivative thereof, and the cross-sectional surface has an L-shaped five-layered section including a series of the insulating body, the active material, the collector, the active material and the insulating body.