Chemistry: electrical current producing apparatus – product – and – Plural concentric or single coiled electrode
Reexamination Certificate
2011-01-11
2011-01-11
Mayes, Melvin C (Department: 1793)
Chemistry: electrical current producing apparatus, product, and
Plural concentric or single coiled electrode
C429S161000, C429S211000, C029S623100, C029S623400
Reexamination Certificate
active
07867644
ABSTRACT:
In a secondary battery, for providing a structure which can enable a welding operation even when a gap is formed between a current collecting plate and a winding assembly, recessed portions are formed in a positive current collecting plate. The recessed portions are disposed opposite to the winding assembly. A laser beam is irradiated to welding protrusions located between the recessed portions to melt the welding protrusions. Here, since the end surface of a positive electrode foil is uneven in height, the positive electrode foil does not contact the positive current collecting plate necessarily. The welding operation is performed by heating, melting, and dropping the welding protrusions by the use of a YAG laser under the welding condition of a laser power of 900 W and a welding speed 2 m/min.
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Aota Kinya
Arai Masatsugu
Nakai Kenji
Tada Akinori
Antonelli, Terry Stout & Kraus, LLP.
Hitachi Vehicle Energy, Ltd.
Mayes Melvin C
Stalder Melissa
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