Patent ID: 8114535

Claim:
A battery pack assembly for providing electrical power comprising; a plurality of battery packs each including a plurality of cells each having an anode and a cathode for storing and transmitting electrical power disposed in a side by side relationship with each battery pack defining an air path therethrough for cooling, and at least one metering device for metering the quantity of air flowing respectively through said air paths to evenly cool all of said battery packs to a substantially uniform temperature; wherein said metering device is a metering plate defining a plurality of apertures for metering air flow into said air paths of said battery packs, and wherein said metering plate is disposed upstream of said battery packs and each of said apertures converges as said aperture extends through said metering plate creating an entry opening having area, A entry , and an exit opening having area, A exit , to establish a ratio, A entry /A exit , greater than one.