| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress that a center pin is stuck into an electrode group, and to improve exhaust efficiency of gas even in the case of a large capacity. <P>SOLUTION: In a lithium ion secondary battery, the center pin 10 is inserted into a hollow part 9a of the electrode group 9. The center pin 10 has the center part 11, peripheral parts 15, and end parts 17. The center part 11 is extended in the diameter direction of the hollow part 9a. The peripheral parts 15 are extended along one part of the inner wall face of the hollow part 9a from the first end 11a of the center part 11 in the diameter direction of the hollow part 9a so as to be arranged on mutually opposite sides against the center part 11. The end parts 17 are extended toward inside of the hollow part 9a from the end part in the peripheral direction of the peripheral parts 15 so as to go away from the inner wall face of the hollow part 9a, and are separated from the center part 11. <P>COPYRIGHT: (C)2009,JPO&INPIT |
