A battery pack comprising: a plurality of battery cells; a circuit board electrically connecting the plurality of battery cells together, the circuit board extending along a first direction and a second direction; and a bus bar (101, 102) connected to the circuit board to form a charge/discharge path, wherein the bus bar (101, 102) extends along a third direction, different from the first and second directions (D1, D2), wherein: the battery cells are arranged in rows along the first direction in which first and second side portions (S1, S2) of the circuit board face each other, the battery cells of first rows are biased toward the second side portion of the circuit board along the first direction to provide space for a first connection hole between the first rows and the first side portion of the circuit board, the battery cells of second rows are biased toward the first side portion of the circuit board along the first direction to provide space for a second connection hole between the second rows and the second side portion of the circuit board, the battery cells of two rows adjacent to each other along the second direction are electrically connected to each other by the circuit board such that the battery cells of two rows adjacent along the second direction to each other form one module, in the module the battery cells of one row are shifted along the first direction relative to the other row, the bus bar includes first and second bus bars (101, 102) extending along the first and second side portions (S1, S2) of the circuit board, and the first and second bus bars (101, 102) are respectively connected through the first and second connection holes of the circuit board to first and second polarities of the module that are different from each other. a plurality of battery cells; a circuit board electrically connecting the plurality of battery cells together, the circuit board extending along a first direction and a second direction; and a bus bar (101, 102) connected to the circuit board to form a charge/discharge path, wherein the bus bar (101, 102) extends along a third direction, different from the first and second directions (D1, D2), wherein: the battery cells are arranged in rows along the first direction in which first and second side portions (S1, S2) of the circuit board face each other, the battery cells of first rows are biased toward the second side portion of the circuit board along the first direction to provide space for a first connection hole between the first rows and the first side portion of the circuit board, the battery cells of second rows are biased toward the first side portion of the circuit board along the first direction to provide space for a second connection hole between the second rows and the second side portion of the circuit board, the battery cells of two rows adjacent to each other along the second direction are electrically connected to each other by the circuit board such that the battery cells of two rows adjacent along the second direction to each other form one module, in the module the battery cells of one row are shifted along the first direction relative to the other row, the bus bar includes first and second bus bars (101, 102) extending along the first and second side portions (S1, S2) of the circuit board, and the first and second bus bars (101, 102) are respectively connected through the first and second connection holes of the circuit board to first and second polarities of the module that are different from each other. the battery cells are arranged in rows along the first direction in which first and second side portions (S1, S2) of the circuit board face each other, the battery cells of first rows are biased toward the second side portion of the circuit board along the first direction to provide space for a first connection hole between the first rows and the first side portion of the circuit board, the battery cells of second rows are biased toward the first side portion of the circuit board along the first direction to provide space for a second connection hole between the second rows and the second side portion of the circuit board, the battery cells of two rows adjacent to each other along the second direction are electrically connected to each other by the circuit board such that the battery cells of two rows adjacent along the second direction to each other form one module, in the module the battery cells of one row are shifted along the first direction relative to the other row, the bus bar includes first and second bus bars (101, 102) extending along the first and second side portions (S1, S2) of the circuit board, and the first and second bus bars (101, 102) are respectively connected through the first and second connection holes of the circuit board to first and second polarities of the module that are different from each other.