| 摘要 |
PROBLEM TO BE SOLVED: To aim at a uniform utilization rate of each electrode as for electrode groups in which plural electrodes were connected to a current collection body. SOLUTION: A positive electrode group 20 has plural positive electrodes 22 of connected through a current collecting tab 26 to a positive electrode current collection terminal 23. The positive electrodes 22 are divided into the first group 22a which is arranged and separated far from the positive electrode current collection terminal 23 and the second group 22b which is arranged adjacent to the positive electrode current collection terminal 23, and a current collection tab 26 of the positive electrode 22 of the first group 22a side is set thicker than the current collection tab 26 of the second group 22b side of the positive electrode 22, In addition, each current collection tab 26 of the first group 22a side and current collection tab 26 of the second group 22b side gathers, and laser welding is made individually for the positive electrode current collection terminal 23.
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