Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
March 6, 2012
Patent Application Number
11919505
Date Filed
February 1, 2007
Patent Citations Received
0
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Patent Primary Examiner
Patent abstract
A positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween to form an electrode group 3 having a circular shape or an oval shape. Next, a center core member 2 for applying a pressure to the electrode group 3 is inserted in a winding core hole 6 of the electrode group 3. Thereafter, the electrode group 3 is deformed into a flat shape. Then, the flat electrode group 3 is accommodated in a rectangular flat armoring can 4 with a base and an opening portion of the armoring can 4 is sealed, thereby producing a rectangular flat secondary battery.
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