| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-capacity, low cost lithium battery whose safety is secured. SOLUTION: The negative electrode current collecting plate 1 is plate-shaped, where a negative electrode lead strip 8 led out from the negative electrode of an electrode winding group 6 is joined to the rim of a plane part 1b of the current collecting plate 1 by laser welding, and is joined to the bottom of a battery container 4, which is the back of the laser-joined surface, by resistance welding. On the negative electrode current collecting plate 1, a through-hole 1d is formed on the circumference of the outer diameter of a winding core 5, the through-hole connecting a space 21, sectioned off by the lower end of the electrode winding group 6 and by the bottom of the battery container 4, to a hollow part 22 of the winding core 5. Upon overcharging, high-pressure gas is guided from the through-hole 1d to the hollow part 22, so that additional current collecting components, other than the negative electrode current collecting plate 1, at the negative electrode is not necessary. |
