Flat battery and production method therefor

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Flat-type unit cell and specific unit cell components

Reexamination Certificate

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C429S127000, C429S211000, C429S128000, C429S124000, C429S231950, C029S623100

Reexamination Certificate

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07108941

ABSTRACT:
A positive electrode plate (7) and a negative electrode plate (8) are coiled around with a separator (9) interposed therebetween into a flat shape having a rectangular plan to obtain an intermediate product (17) of an electrode plate group, whose corners are then cut off along straight or curved lines to obtain a substantially octagonal electrode plate group (1a, 1b), so that it is accommodated in a negative electrode case (5) having a circular plan with good space efficiency. The problem of residual water in the coiled electrode plate group (1a, 1b, 1c) of a coin type battery having high load current characteristics is resolved by a vacuum dry treatment, and the problem of dust generated during the welding of leads is resolved by a method whereby dust is not scattered inside the case. Flat batteries with higher reliability are thus obtained.

REFERENCES:
patent: 3472699 (1969-10-01), Reisman et al.
patent: 6171724 (2001-01-01), Li et al.
patent: 6451478 (2002-09-01), Okahisa et al.
patent: 59-066055 (1984-04-01), None
patent: 61-168555 (1986-10-01), None
patent: 01-309251 (1989-12-01), None
patent: 11-073942 (1999-03-01), None
patent: 2000-164259 (2000-06-01), None
patent: 2000-182594 (2000-06-01), None

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