Battery Pack Assembly

A battery pack thermal management assembly for drawing heat from a plurality of generally rectangular prismatic batteries having opposed major surfaces and arranged in a stacked configuration inside a housing, the thermal management assembly comprising:

• a plurality of thermal transfer sheets made from sheets of a compressed mass of exfoliated graphite particles, each said thermal transfer sheet being positioned to contact the major surface of at least one of the prismatic batteries;
• a cover plate having a top face and a bottom face and including a plurality of apertures through which the plurality of thermal transfer sheets extend, said apertures including at least one curved sidewall, said thermal transfer sheets being bent over said curved sidewall;
• and
• a heat sink, at least a portion of each of said thermal transfer sheets being secured between said heat sink and said top face.