| 摘要 |
A sealed battery includes a battery case. A side of the battery case includes a cleavage groove forming a cleavage line intersecting a ridge line. The cleavage line is formed exclusively of a curved line having a first curved segment curved to protrude in one direction as viewed in a direction normal to the side of the battery case and a second curved segment curved to protrude in a direction forming an angle of 90 degrees or larger with the direction in which the first curved segment protrudes, the first and second curved segments being connected with each other. An end of the first curved segment is connected with an end of the second curved segment. At least one of the first curved segment and the second curved segment intersects the ridge line. The cleavage groove has a depth that produces a ratio of the remaining thickness relative to the plate thickness of the battery case of 75% or smaller.
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