| 摘要 |
PROBLEM TO BE SOLVED: To provide an electricity storage element having a valve that reduces working pressure on an anode side while securing sealing strength.SOLUTION: An electricity storage element of the present invention includes a case in which an electrode group and an electrolyte are accommodated, and a pressure adjusting valve 14 for adjusting pressure in the case. The case has a rectangular parallelepiped shape or a cylindrical shape with a wall thickness of 0.8 mm or less, formed by molding metal. The pressure adjusting valve 14 has such checking properties that a working pressure in the direction from the inside of the case toward the outside is 10-200 kPa, and the pressure adjusting valve does not work at a pressure of 0-500 kPa in the direction from the outside of the case toward the inside. |
