| 摘要 |
The present invention controls reduction of binding force of fastening members acting on a battery stack under a low-temperature environment. A battery module (10) according to one aspect is provided with a stack comprising a plurality of batteries (30), separators (70) provided on the batteries (30), and a pair of end plates (80a, 80b) disposed on both end portions of the plurality of batteries (30) in a stacking direction thereof. Binding bars (90a-d) are fixed to the pair of end plates (80a, 80b) so as to tightly fasten the plurality of batteries (30). When the temperature changes from 30ºC to -30ºC, a shrinkage &Dgr;L per unit length in a longitudinal direction of the binding bars (90a-d) is greater than a shrinkage &Dgr;S per unit length in the stacking direction of the stack. |
