Patent ID: 7678493

Claim:
A battery pack comprising: a case; a battery block disposed in the case and including a plurality of elongated batteries positioned so as to be perpendicular to a specified surface of the case and arranged vertically and horizontally in close proximity; and a circuit board connected with the batteries of the battery block, wherein: the batteries of the battery block are lined up in a plurality of horizontal rows and the batteries in each of the horizontal rows are lined up with the same orientation with respect to terminals of the batteries, the battery block includes a plurality of lead plates connected to the terminals of the batteries that are lined up with the same orientation to connect them in parallel and form a plurality of parallel units, and the parallel units are stacked vertically in such a manner that the orientation of any one of the stacked parallel units is different in the vertical direction with respect to adjacent parallel units; the lead plates, which connect the batteries of the parallel units in parallel, also connect the terminals of the batteries of at least one of the adjacent parallel units in the vertical direction to connect the at least one adjacent parallel unit in series; each of the lead plates is non-folded and has a projection that protrudes beyond the outer periphery of the battery block, and the lead plate projections are connected with the circuit board; the circuit board is disposed so as to oppose a side of the battery block in an orientation that allows the connections with the projections of the lead plates; and the lead plates and the projections are located in the sane plane, and the lead plate projections are connected with the circuit board so as to join the battery block and the circuit board as a single unit.