Non-aqueous electrolyte secondary cell with a spirally wound electrode unit
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United States of America Patent
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Feb 3, 2004
Grant Date -
Jul 11, 2002
app pub date -
Jun 22, 2001
filing date -
Jun 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A non-aqueous electrolyte secondary cell in which inner shorting may be prevented from occurring and which is improved in operational reliability and safety. The non-aqueous electrolyte secondary cell is comprised of an electrode unit loaded in a cell casing. The electrode unit is comprised at least of a strip-shaped cathode and a strip-shaped anode layered together and coiled longitudinally around a center pin. There is provided a pre-set clearance between the electrode unit and the cell casing so that (B+C)/2A, where A, B and C denote the inner diameter of the cell casing, the maximum outer diameter of the electrode unit and the minimum outer diameter of the electrode unit, respectively, is equal to or more than 0.954 and equal to or less than 0.988. The wound electrode unit has a degree of tightness to give a deformation of no more than 8%.
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