a prismatic - cell battery pack is provided with integral coolant passages and a distributed array of coolant channels coupled between an intake plenum and a pair of exhaust plenums . coolant medium forced into the intake plenum draws heat away from the battery cells , and then exits via the exhaust plenum for expulsion of heat into the atmosphere . the battery pack is configured as a set of stackable interlocking battery cell modules including at least one battery cell in thermal proximity to an array of coolant channels distributed over the profile of the battery cell , and a pair of peripheral chambers joined to opposite ends of the coolant channels to form the intake and exhaust plenums when the modules are arranged and interlocked in a lineal stack . the entry end of each channel is closer to a centerline of the battery cell than the exit end of the channel .