| 摘要 |
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 ( 1 a , 1 b), 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 ( 1 a , 1 b , 1 c) 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. |
