BATTERY ASSEMBLY
A spacer interposed between first and second unit cells has alternately arranged first and second corrugated portions. Each of the corrugated portions has first and second protrusions alternately and repeatedly formed continuously in a vertical direction. Each of the first protrusions protrudes from a center in a thickness direction toward the first unit cell so as to define a clearance functioning as a cooling passage between the second unit cell and the first protrusion. Each of the second protrusions protrudes from the center in the thickness direction toward the second unit cell so as to define a clearance functioning as a cooling passage between the first unit cell and the second protrusion. The arrangement phases of the first and second protrusions are different from each other in the first and second corrugated portions. A cooling medium flowing in the cooling passages is alternately brought into contact with the first and second unit cells, thus achieving the uniform cooling efficiency with respect to the unit cells.
1 . A battery assembly comprising:
a first unit cell and a second unit cell disposed adjacently to each other; and
a spacer interposed between the first unit cell and the second unit cell and adapted to form a cooling passage, through which a cooling medium is allowed to pass;
wherein the spacer comprises:
a first corrugated portion having first protrusions and second protrusions alternately and repeatedly formed in a direction crossing the cooling passage, wherein each of the first protrusion protrudes toward the first unit cell from a center in a thickness direction so as to define a clearance between the second unit cell and the first protrusion whereas each of the second protrusion protrudes toward the second unit cell from the center in the thickness direction so as to define a clearance between the first unit cell and the second protrusion; and
a second corrugated portion arranged adjacently to the first corrugated portion in the direction of the cooling passage and having the first and second protrusions alternately and repeatedly formed in the direction crossing the cooling passage at a phase different from that of the first corrugated portion.
2 . The battery assembly according to claim 1 , wherein the first protrusions abut against the first unit cell whereas the second protrusions abut against the second unit cell.
3 . The battery assembly according to claim 1 , wherein the respective first protrusions of the first corrugated portion and the respective second protrusions of the second corrugated portion are aligned in the direction of the cooling passage; and
wherein the respective second protrusions of the first corrugated portion and the respective first protrusions of the second corrugated portion are aligned in the direction of the cooling passage.
4 . The battery assembly according to claim 1 , wherein the first and second corrugated portions are alternately and repeatedly arranged in the direction of the cooling passage.
5 . The battery assembly according to claim 1 , wherein the spacer has a slit extending in the direction crossing the cooling passage, and
wherein the first corrugated portion and the second corrugated portion are formed upstream and downstream of the cooling passage in the slit.
6 . The battery assembly according to claim 1 , wherein the spacer further includes a connecting portion extending in the direction crossing the cooling passage.
7 . The battery assembly according to claim 6 , wherein the spacer further includes a first bar at one end in the direction crossing the cooling passages in the first and second corrugated portions as well as a second bar at the other end; and
wherein the connecting portion connects the first bar and the second bar to each other.
8 . The battery assembly according to claim 1 , wherein an upstream end of the cooling passage defined by the first and second protrusions is chamfered at a corner portion.
9 . The battery assembly according to claim 1 , wherein a downstream end of the cooling passage defined by the first and second protrusions is chamfered at a corner portion.