| 摘要 |
PROBLEM TO BE SOLVED: To reduce internal pressure of a sealed case with a simple structure.SOLUTION: In a battery pack 10, plural battery modules are housed in a sealed case. The sealed case has a square-cylindrical case body with a bottom. An opening of the case body is blocked by a rectangular plate-like lid member 14 fixed to the case body with bolts B. A clearance between a first insertion hole 18 provided nearest a corner 14a and a second insertion hole 19 adjacent to the first insertion hole 18 among insertion holes 17 provided on the lid member 14 is twice as large as a clearance between other insertion holes 17. A clearance d1 between a first bolt B1 inserted in the first insertion hole and a second bolt B2 inserted in the second insertion hole 19 is twice as large as a clearance d2 between other bolts B. |
