Patent ID: 8624552
Filing Date: 2014-01-07
Classification: H01M,Y02E

Abstract:
1. A battery pack for an electric tool comprising: a plurality of battery cells including first stage battery cells, second stage battery cells and third stage battery cells; a housing receiving the plurality of battery cells; an air flow passage defined in the housing; and a flow plate disposed in the air flow passage and configured such that an air flow flows to cool at least the first stage battery cells, the second stage battery cells and the third stage battery cells, wherein the first stage battery cells includes a plurality of battery cells that are arranged in a first direction, the second stage battery cells includes a plurality of battery cells that are arranged in a second direction, the third stage battery cells includes a plurality of battery cells that are arranged in a third direction, and the first stage battery cells, the second stage battery cells, and the third stage battery cells are arranged relative to each other in a fourth direction that is different from the first direction, the second direction, and the third direction.