Patent ID: 7666543

Claim:
A battery comprising: a plurality of stacked unit-cell layers stacked on one another in a stacked direction, including: a first unit-cell layer including at least: a first unit cell; a first frame member which holds the first unit cell therein, wherein the first frame member includes an inlet for introducing a coolant into the inside of the battery and an outlet for discharging the coolant which has passed through the inside of the battery; and a space provided between the first unit cell and the first frame member through which the coolant passes; and a second unit-cell layer adjacent the first unit-cell layer in the stacked direction including at least a second unit cell and a second frame member which holds the second unit cell therein in the stacked direction relative to the first unit cell, wherein the first and second unit cells are flat unit cells each having a major surface facing in the stacked direction and each comprising a power generating element and an insulating cover covering the power generating element along the respective major surface, and wherein the first unit cell is held in contact at the major surface thereof with the second unit cell in the stacked direction.