| 摘要 |
PROBLEM TO BE SOLVED: To provide: a battery pack capable of obtaining excellent welding quality and a welding part high in tensile strength, small in connection resistance between battery electrodes, capable of reducing current-carrying loss in battery charging/discharging, and effective in improvement of battery life; and its welding method. SOLUTION: In a battery pack in which multiple battery cells are housed in one or multiple rows in an electrically insulating housing case and an electrode of each battery cell is coupled to an electrode of another battery cell through each connecting metallic plate, the connecting metallic plates 3 made of copper are disposed on both surfaces of a positive electrode part 6 of each battery cell 2 and a negative electrode part 7 of another battery cell 2 to respectively form lap joints, wherein the battery pack includes welding parts 5 each formed in one specific positions on the connecting metallic plate 3 above the positive electrode part 6 and on the other specific positions on the connecting metallic plate 3 above the negative electrode part 7 by applying arc spot welding. The depth h of weld penetration in the welding part 5 is larger than the thickness T1 of the connecting metallic plate 3 and smaller than the thickness T1 plus the thickness T2 of the positive electrode part 6 or the negative electrode part 7, and is formed in a range satisfying T1<h≤(T1+T2×4/5). COPYRIGHT: (C)2008,JPO&INPIT
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