POWER STORAGE ELEMENT AND MANUFACTURING METHOD OF THE SAME

To provide a power storage element in which sealability around a shaft body of an electrode terminal is improved.SOLUTION: A power storage element 10 includes: a container 100; an electrode terminal 200; and an upper insulation member 300. The electrode terminal 200 has: a terminal body 201 disposed outside the container 100; and a shaft body 210 which is connected to the terminal body 201 and arranged penetrating through a lid body 120, a wall part of the container 100. The upper insulation member 300 is disposed between the terminal body 201 and the lid body 120 of the container 100. A first seal part 50 and a second seal part 60, which are arranged side by side in a radial direction of the shaft body 210 and extend in a circumferential direction of the shaft body 210, are disposed in at least one of a space between the terminal body 201 and the upper insulation member 300 and a space between the upper insulation member 300 and the lid body 120. The second seal part 60 is formed of a material having flexibility higher than that of a material forming the first seal part 50.SELECTED DRAWING: Figure 4 【課題】電極端子の軸体周りの密閉性が向上された蓄電素子を提供すること。【解決手段】蓄電素子１０は、容器１００と、電極端子２００と、上部絶縁部材３００とを備える。電極端子２００は、容器１００の外部に配置された端子本体２０１、及び、端子本体２０１に接続され、かつ、容器１００の壁部である蓋体１２０を貫通して配置された軸体２１０を有する。上部絶縁部材３００は、端子本体２０１と容器１００の蓋体１２０との間に配置されている。端子本体２０１と上部絶縁部材３００との間、及び、上部絶縁部材３００と蓋体１２０との間の少なくとも一方において、軸体２１０の径方向に並び、かつ、軸体２１０の周方向に延びた第一シール部５０及び第二シール部６０が配置されている。第二シール部６０は、第一シール部５０を形成する材料よりも柔軟性が高い材料で形成されている。【選択図】図４