| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a battery pack restraining a lowering of discharging capacity even when used in the environment of low temperature. SOLUTION: A flat heating element 8 is operated when circumferential temperature of a cell 4 is lower than a prescribed value, and the operation of the flat heating element 8 is stopped when circumferential temperature of the cell 4 is higher than the prescribed value.</p> |
