| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack which is thin at the initial stage and of which the thickness increases little even after repetition of charge and discharge cycles, and which has high energy density. SOLUTION: In the battery pack which houses square batteries in a box case of thin rectangular parallelepiped, an opening part is provided in the center on two faces having the largest area of the box case, and the opening part is covered by an insulation material. COPYRIGHT: (C)2004,JPO
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