Nonaqueous electrolyte secondary cells

Details Nonaqueous electrolyte secondary cells Nonaqueous electrolyte secondary cells

2005-05-31

2005-05-31

Bell, Bruce F. (Department: 1746)

Chemistry: electrical current producing apparatus, product, and

Plural concentric or single coiled electrode

C429S133000, C429S146000, C429S186000, C429S208000

Reexamination Certificate

active

06899973

ABSTRACT:
A nonaqueous electrolyte secondary cell comprises a rolled-up electrode unit2composed of a positive electrode23, a negative electrode21and a separator22interposed therebetween, and a negative electrode current collector plate3and a positive electrode current collector plate30joined to the respective ends of the electrode unit2. The negative electrode collector plate3is joined to an edge of the negative electrode21projecting at one of the opposite ends of the electrode unit2. The collector plate3has a two-layer structure comprising a copper layer31made of copper or an alloy consisting predominantly of copper, and a metal layer made of a metal not forming an intermetallic compound with lithium and having a lower laser beam reflectivity than copper or an alloy consisting predominantly of the metal. The collector plate3has its copper layer31contacted with the edge of the negative electrode21and welded thereto with a laser beam. This improves the weldability of the collector plate3to the rolled-up electrode unit2to achieve a high current collecting efficiency.

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