POWER STORAGE DEVICE

PROBLEM TO BE SOLVED: To provide a power storage device capable of adjusting pressure for each accommodation space while avoiding an increase in size, and suppressing loss of battery performance.SOLUTION: A power storage device includes a housing that accommodates a laminate in which a bipolar electrode in which a positive electrode layer is provided on one surface of a current collector and a negative electrode layer is provided on the other surface of the current collector is stacked via a separator, and open valves respectively provided in housing spaces in the housing. The open valve includes two or more communication holes that communicate between each of the two or more housing spaces and the outer surface of the housing, an elastic member disposed in a state of being urged to the outer surface of the housing so as to close the two or more communication holes, and a communicating path that is formed by a space surrounded by the elastic member and the housing and communicates with the outside of the housing, and the communicating hole and a communicating passage nearest to the communicating hole are arranged on the outer surface of the housing such that a distance between the communicating hole and the communicating passage is shorter than the distance between the communicating holes.SELECTED DRAWING: Figure 2 【課題】サイズの大型化を回避しつつ収容空間ごとの圧力調整を可能とし、かつ、電池性能の損失を抑制することができる蓄電装置を提供する。【解決手段】蓄電装置は、集電体の一方の面に正極層が設けられると共に集電体の他方の面に負極層が設けられたバイポーラ電極がセパレータを介して積層された積層体を収容する筐体と、筐体内の収容空間のそれぞれに設けられる開放弁と、を備える。開放弁は、複数の収容空間のそれぞれと筐体の外面との間を連通する複数の連通孔と、複数の連通孔を塞ぐように筐体の外面に付勢された状態で配置される弾性部材と、弾性部材と筐体とによって囲まれる空間により形成され、筐体の外側に連通する連通路と、を有し、筐体の外面において、連通孔と連通孔に直近の連通路との距離が連通孔同士の距離よりも短くなるように、連通孔及び連通路が配置されている。【選択図】図２