BATTERY PACK AND ELECTRICAL DEVICE

A battery pack (1) includes a plurality of cells (11). Sealing parts of each cell include a first sealing part (12c), a second sealing part (12d) and a third sealing part (12e). The tab (13) extends out of the cell case (12) from the first sealing part (12c). The second sealing part (12d) is arranged on either of opposite sides of the accommodation portion (12a) in a second direction (y). The third sealing part (12e) extends from the second sealing part (12d) and connects the first sealing part (12c) and the second sealing part (12d). The plurality of cells (11) include adjacent first cell (111) and second cell. The third sealing part (12e) of the first cell (111) is disposed oriented toward the third sealing part (12e) of the second cell, and the third sealing part (12e) of the second cell (112) is disposed oriented toward the third sealing part (12e) of the first cell (111). A first structural member (121) is disposed between the third sealing part (12e) of the first cell (111) and the third sealing part (12e) of the adjacent second cell, and the first structural member (121) includes an insulating material. The first structural member (121) isolates the aluminum-plastic films of the adjacent cells (11), limits the electronic circulation loop between the aluminum-plastic film and the negative electrode of the cell, thereby improving electrochemical corrosion, improving the safety performance of the cells (11) and the battery pack (1).