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Nonaqueous electrolyte secondary cells

  • US 6,653,017 B2
  • Filed: 03/13/2001
  • Issued: 11/25/2003
  • Est. Priority Date: 03/14/2000
  • Status: Expired due to Term
First Claim
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1. A nonaqueous electrolyte secondary cell comprising a positive electrode (41) and a negative electrode (43) each in the form of a strip and rolled up into a spiral form with a separator (42) interposed between the electrodes to obtain a rolled-up electrode unit (4), and a cell can (1) having the rolled-up electrode unit (4) accommodated therein, each of the positive electrode (41) and the negative electrode (43) being formed by coating a current collector in the form of a strip with an active substance, the cell being adapted to deliver electric power generated by the rolled-up electrode unit (4) to the outside via a pair of electrode terminal portions, the nonaqueous electrolyte secondary cell being characterized in that the current collector of the positive electrode (41) or the negative electrode (43) has an edge (48) projecting from at least one of opposite ends of the rolled-up electrode unit (4), the current collector edge (48) being covered with a current collecting plate (5), the current collecting plate (5) having a plurality of circular-arc protrusions (52) projecting in a circular-arc cross section toward the current collector edge (48) and a plurality of slit pieces (53) cut to a raised form toward the current collector edge (48), the circular-arc protrusions (52) being welded to the current collector edge (48) while biting into the current collector edge (48) along with the slit pieces (53), the current collecting plate (5) being connected to one of the electrode terminal portions.

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