NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR PRODUCING SAME

摘要

The present invention relates to a non-aqueous electrolyte secondary battery provided with a non-aqueous electrolyte and an electrode group wherein an elongated first electrode (5), an elongated second electrode (6), and an elongated separator (7) interposed between the first electrode and the second electrode are wound in a coiled shape; the first electrode contains a sheet-shaped first collector (5a) and a first active material layer (5b) at the surfaces of the first collector; the second electrode contains a sheet-shaped second collector (6a) and a second active material layer (6b) at the surfaces of the second collector; and the winding terminus of the first electrode faces the second electrode that is disposed further on the outer peripheral side with the separator therebetween. When the secondary battery repeats rapid charging/discharging in a high-temperature environment, there have been problems such as rupturing of facing site (B) of the second electrode that faces the winding terminus of the first electrode. The present invention resolves this problem in the secondary battery by such means as reinforcing the facing site (B) of the second electrode that faces the winding terminus of the first electrode using a reinforcing section (24) that supplements the thickness of the secondary electrode.