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    • 107. 发明公开
    • POWER STORAGE ELEMENT
    • EP4138207A1
    • 2023-02-22
    • EP21803725.7
    • 2021-05-13
    • GS Yuasa International Ltd.
    • NAKAMURA, JunKAWAI, Akio
    • H01M50/557H01G11/74H01M50/516H01M50/562H01M50/567
    • In the present embodiment, there is provided an energy storage device including an electrode assembly, a case that houses the electrode assembly, and a metal external terminal disposed in the case, wherein the external terminal includes a flange portion spreading along the case outside the case and a shaft portion extending from the flange portion and penetrating the case, the flange portion is formed of a clad material including a plurality of metal layers stacked in a penetrating direction of the shaft portion, and includes a through hole through which the shaft portion is inserted, the shaft portion includes an enlarged diameter portion that spreads along a hole peripheral edge portion of the through hole in a first metal layer at an end on a case side of the plurality of metal layers, and a swaged portion that spreads along a hole peripheral edge portion of the through hole in a second metal layer at an end opposite to the case of the plurality of metal layers, and sandwiches the hole peripheral edge portion of the through hole of the flange portion between the swaged portion and the enlarged diameter portion, and the hole peripheral edge portion of the second metal layer is recessed toward the case relative to other portions of the second metal layer, and is formed at a position including the swaged portion inside as viewed from the penetrating direction.