| 摘要 |
PROBLEM TO BE SOLVED: To reduce variations in an opening shape and an opening area of a pressure release valve.SOLUTION: A power storage device has an intersection groove 23 in a valve body 21 of a pressure release valve 20. The intersection groove 23 has an intersection part P in which a straight groove 24 and a straight groove 25 intersect with each other. A region including the intersection part P is used as a first cleavage part 26 and a region not including the intersection part P is used as a second cleavage part 27. Then, mechanical strength of the first cleavage part 26 is made weaker than that of the second cleavage part 27. |
