| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage of a unit cell due to thermal stress by stably welding the unit cell to a connection fitting, and preventing an harmful effect due to heat generation of a welding part of the unit cell, and also to extend a replacement time of a welding electrode by reducing consumption of the welding electrode. SOLUTION: In a method of manufacturing a battery pack, connection fittings 20 are spot-welded to electrodes 19 of adjoining unit cells 10, and a plurality of unit cells 10 are connected through the connection fittings 20. In the manufacturing method, welding parts 23 of the connection fitting 20 are pressed against a surface of the unit cell 10 by welding and pressing means 40; a pair of electrodes 50 carrying a welding current are brought into contact with parts located on a surface of the connection fitting 20 and different from the welding parts 23; the welding current is carried to the connection fitting 20 by the pair of electrodes 50; the welding current carried to the connection fitting 20 is carried to the electrode 19 of the unit cell 10 by the welding parts 23 pressed by the welding and pressing means 40; and the welding part 23 of the connection fitting 20 is spot-welded to the electrode 19 of the unit cell 10. COPYRIGHT: (C)2009,JPO&INPIT
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