Patent ID: 8603670
Filing Date: 2013-12-10
Classification: H01M,Y02E

Abstract:
1. A secondary battery, comprising: a sealing plate fitted with a terminal; an electrode assembly made up of positive electrode and negative electrode that are flatly wound with separators; and an outer can housing the electrode assembly in such a way that a winding axis direction of the electrode assembly is arranged in parallel to the sealing plate and having a mouth portion to which the sealing plate is hermetically fixed, the electrode assembly being provided with a wound positive electrode substrate exposed portion at one end of the electrode assembly and with a wound negative electrode exposed portion at another end of the electrode assembly, the positive electrode substrate exposed portion or the negative electrode substrate exposed portion being coupled with a collector, the terminal being coupled with the collector, the terminal having a coupling portion formed on one side of a flange portion, and the collector having an opening portion and a thin area made thinner than other portions formed in the circumference of the opening portion of the collector, the coupling portion being inserted through opening portions formed in a first insulating member, the sealing plate, a second insulating member and the collector, a tip end side of the coupling portion being deformed in a diameter-increasing direction in the thin area made thinner than other portions formed in the collector, a surface of the deforming portion in the coupling portion being made approximately flat with a surface of the collector, and a joint section of the deforming portion in the coupling portion and the collector being welded by irradiating a high-energy beam.