| 摘要 |
PROBLEM TO BE SOLVED: To protect a secondary battery to be built while miniaturizing an exterior appearance.SOLUTION: A battery pack is connected to a battery driving apparatus BD, and can feed power to an apparatus-side secondary battery built in the battery driving apparatus BD. The battery pack comprises a square secondary battery cell 1 having constant thickness on an end face, a circuit board 30 connected to the secondary battery cell 1, and a body case 10 housing the secondary battery cell 1 and the circuit board 30. The circuit board 30 and the secondary cell 1 can be laminated. Thereby, the circuit board 30 and the secondary battery cell 1 can be efficiently arranged in a limited space of the body case 10. |
