Flat battery and production method therefor

Details Flat battery and production method therefor Flat battery and production method therefor

2006-09-19

2006-09-19

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Flat-type unit cell and specific unit cell components

C429S127000, C429S211000, C429S128000, C429S124000, C429S231950, C029S623100

Reexamination Certificate

active

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.

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