Low thermal spread battery module

摘要

A battery pack (20) assembly including a plurality of cells (28) surrounded by a spacer (56) for creating a radial space (58) between the cell (28) and cylindrical sections (34, 36) defining a casing (26). At least two of the cylindrical sections (34, 36) are conical or in different radial positions to define differing volumes between the respective two cells (28). Each of the cylindrical sections (34, 36) may be eccentrically offset from the respective cell (28) to define a greater radial space (58) adjacent the air inlet chamber (48) and a lesser radial space (58) adjacent the respective exit to increase the velocity of the discharging air adjacent the respective exit. Each of the cylindrical sections (34, 36) may have a casing undulating surface (60) extending circumferentially and/or each of the walls of the cells (28) may have a similar cell undulating surface (62) to increase the cooling capacity of the cooling air.