POWER STORAGE ELEMENT UNIT

To provide a power storage element unit which can permit thermal expansion of a resin.SOLUTION: A power storage element unit includes a storage box having a plurality of wall parts, and a plurality of power storage element modules stored in the storage box. At least one of the plurality of wall parts is composed of a laminate including a resin plate and a metal plate. The resin plate is provided with one of a plurality of through holes into which a shaft part of a screw is inserted and a plurality of screw holes on which the shaft part to which the plurality of through holes are inserted is screwed, and the metal plate is provided with the other of the plurality of through holes or the plurality of screw holes. The plurality of through holes includes one reference through hole and a plurality of wide through holes. Each of the plurality of wide through holes has a width larger than the diameter of the reference through hole, in a direction at which each of the wide through holes and the reference through hole are aligned.SELECTED DRAWING: Figure 8 【課題】樹脂の熱膨張を許容できる蓄電素子ユニットを提供する。【解決手段】蓄電素子ユニットは、複数の壁部を有する収納箱と、収納箱に収納される複数の蓄電素子モジュールと、を備える。複数の壁部の少なくとも一つは、樹脂板と金属板とを含む積層体から構成される。樹脂板に、ねじの軸部が通される複数の貫通孔または複数の貫通孔を通された軸部がねじ留めされる複数のねじ穴の一方が設けられ、金属板に、複数の貫通孔または複数のねじ穴の他方が設けられる。複数の貫通孔は、一つの基準貫通孔と、複数の幅広貫通孔とを含む。複数の幅広貫通孔の各々は、幅広貫通孔の各々と基準貫通孔とが並ぶ方向において、基準貫通孔の直径よりも大きな幅を有する。【選択図】図８