A battery pack, comprising: a plurality of cells stacked in a first direction (x) a first structural member and a housing for accommodating the plurality of cells; wherein each cell comprises an electrode assembly, a cell case, and a tab; the cell case comprises an accommodation portion configured to accommodate the electrode assembly and a sealing part extending outward from a periphery of the accommodation portion; the tab is connected to the electrode assembly and extends out from the cell case, the sealing parts comprise a first sealing part, a second sealing part and a third sealing part; the tab extends out of the cell case from the first sealing part; and, in a second direction (y), the second sealing part is disposed on two opposite sides of the accommodation portion, and the third sealing part extends from the second sealing part and connects the first sealing part and the second sealing part; the first structural member comprises an insulating material, and, in the first direction (x), the first structural member is disposed between the third sealing part of the first cell and the third sealing part of the second cell. the first structural member comprises a first part disposed between the third sealing part of the first cell and the third sealing part of the second cell; and a second part disposed between the first sealing part of the first cell and the first sealing part of the second cell in the first direction (x); the housing comprises a first wall, a second wall and a plurality of side walls; the first wall and the second wall are disposed opposite to each other in a third direction (z), the first structural member is disposed on the first wall, and the first structural member extends between the third sealing part of the first cell and the third sealing part of the second cell in the second direction (y); characterized in that, the plurality of cells comprise a first cell and a second cell adjacent to each other, the third sealing part of the first cell is disposed oriented towards the third sealing part of the second cell, and the third sealing part of the second cell is disposed oriented towards the third sealing part of the first cell; and in the third direction (z), a length of a portion of the first part disposed between the third sealing part is H1, and a length of a portion of the second part disposed between the first sealing part is H2, where H1 is less than H2. the cell case comprises an accommodation portion configured to accommodate the electrode assembly and a sealing part extending outward from a periphery of the accommodation portion; the tab is connected to the electrode assembly and extends out from the cell case, the sealing parts comprise a first sealing part, a second sealing part and a third sealing part; the tab extends out of the cell case from the first sealing part; and, in a second direction (y), the second sealing part is disposed on two opposite sides of the accommodation portion, and the third sealing part extends from the second sealing part and connects the first sealing part and the second sealing part; the first structural member comprises an insulating material, and, in the first direction (x), the first structural member is disposed between the third sealing part of the first cell and the third sealing part of the second cell. the first structural member comprises a first part disposed between the third sealing part of the first cell and the third sealing part of the second cell; and a second part disposed between the first sealing part of the first cell and the first sealing part of the second cell in the first direction (x); the housing comprises a first wall, a second wall and a plurality of side walls; the first wall and the second wall are disposed opposite to each other in a third direction (z), the first structural member is disposed on the first wall, and the first structural member extends between the third sealing part of the first cell and the third sealing part of the second cell in the second direction (y); characterized in that, the plurality of cells comprise a first cell and a second cell adjacent to each other, the third sealing part of the first cell is disposed oriented towards the third sealing part of the second cell, and the third sealing part of the second cell is disposed oriented towards the third sealing part of the first cell; and in the third direction (z), a length of a portion of the first part disposed between the third sealing part is H1, and a length of a portion of the second part disposed between the first sealing part is H2, where H1 is less than H2.