NOVELTY - The pack has a pair of end plates (150) arranged to face each other. A set of battery cells (10) is arranged between the end plates in a direction (Z1). A pair of side plates (140) covers side surfaces of the cells, and is coupled to the end plate. A top plate (120) maintains an interval between the end plates to be constant and an interval between the side plates to be constant, where the top plate is located above in a protruding direction of electrode terminals (10a) of the cells. A set of bus bars (15) electrically connects electrode terminals of neighboring battery cells with each other.    USE - Battery pack for use in a rechargeable battery such as cylindrical rechargeable battery, rectangular rechargeable battery i.e. lithium ion battery, and polymer rechargeable battery, which is utilized as a power source and an uninterruptible power supply. Uses include but are not limited to a mobile device i.e. cell phone, electric vehicle, hybrid vehicle and electric bicycle.    ADVANTAGE - The top plate maintains the interval between the end plates to be constant and an interval between the side plates to be constant, and is interposed between the end plates or the side plates, thus effectively suppressing swelling of the battery cells, providing sufficient rigidity for effectively resisting to outer distortion, and effectively preventing a decrease in charging and discharging characteristics occurring due to deformation of a formed battery pack. The pack has a set of interconnection lines for transmitting state information of each battery cell of the pack together into one unit due to interconnection lines guides for pulling, where the interconnection lines can be easily handled without tangling or winding and extend toward the outside of the pack along a determined extension path, so that an appearance quality of the pack can be improved, and repairing and maintaining workability of a formed battery pack can be improved.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a battery pack.    Direction (Z1)    Battery cells (10)    Electrode terminals (10a)    Bus bars (15)    Top plate (120)    Side plates (140)    End plates (150)