Patent ID: 8691412

Claim:
A battery pack comprising: a plurality of cylindrical battery cells arranged in a plurality of rows and a plurality of layers; a plurality of electrode tabs configured to connect the plurality of cylindrical battery cells in parallel, the plurality of electrode tabs each welded to at least two battery cells at weld portions, each electrode tab having a slit in between each pair of adjacent weld portions to form a pair of load absorbing parts in the electrode tab, each slit extending from an insulated portion of a first battery to an insulated portion of a second battery such that the pair of load absorbing parts in the electrode tab formed by the slit absorb a load exerted on the electrode tab when the first battery and the second battery move towards each other, the first and second batteries being connected by a corresponding electrode tab, each electrode tab extending past each end of a corresponding slit such that each end of the corresponding slit ends before a corresponding end of the electrode tab; a partition member for partitioning said battery cells; a lower case for supporting said partition member; a main circuit board electrically connected to said battery cells; and a display circuit board disposed on an opposite side of the partitioning member from said main circuit board; wherein said partition member is provided with a partition plate, a positioning plate for positioning said main circuit board, said positioning plate being provided on the side, facing said lower case, of said partition plate, and an attaching plate for attaching said display circuit board, said attaching plate being provided on the opposite side of said partition plate from said positioning plate, and said partition member is supported by a support protrusion projecting from the lower case and passing through an aperture in the main circuit board.