Battery pack

This assembled battery (1) is provided with: a plurality of battery cells (100) arranged in a first direction; and a case (200) having an internal space (230) in which the plurality of battery cells are housed. The housing (200) includes a first member (210), a second member (220) that forms an internal space (230) together with the first member (210), and a sealing portion (240) that seals a joint portion between the first member (210) and the second member (220). The first member (210) has a first portion (211) that comes into contact with the seal portion (240). The second member (220) has a second portion (220) that faces the first portion (211) with a seal portion (240) therebetween. When the expansion pressure of the internal space (230) acts on the housing (200), the force in the shearing direction acts on the sealing part (240) sandwiched between the first part (210) and the second part (220). 本发明的电池组(1)具备：多个电池单元(100)，沿着第1方向排列；和外壳(200)，具有收纳多个电池单元的内部空间(230)。外壳(200)包括第1部件(210)、与第1部件(210)一起形成内部空间(230)的第2