Patent ID: 8906533

Claim:
A battery module comprising: a plurality of battery cell packs, each having a substantially rectangular shape, wherein each of the battery cell packs includes end portions disposed along shorter sides thereof; a plurality of heat dissipation plates, the battery cell packs and the heat dissipation plates being alternately stacked in a stacking direction; and a cooler that absorbs heat radiated from the battery cell packs and absorbed by the heat dissipation plates, wherein each of the heat dissipation plates has an interlayer plate portion that is in contact with corresponding two of the battery cell packs and side wall plate portions that extend in the stacking direction with respect to the interlayer plate portion on both end sides of the interlayer plate portion and that are in contact with the cooler at outer faces thereof, and each of the heat dissipation plates has a low thermal resistance region between the interlayer plate portion and each side wall plate portion, the low thermal resistance region having a lower thermal resistance than the interlayer plate portion, wherein, in a cross-sectional view that is taken along the stacking direction and that includes the cooler, the cooler is arranged along side faces of the battery module at which the end portions are disposed, and wherein, in the cross-sectional view that is taken along the stacking direction and that includes the cooler, each of the end portions of the battery cell packs is disposed in a space defined by adjacent ones of the low thermal resistance regions, wherein the low thermal resistance region has a shape, when viewed in cross section, in which the thickness increases to form a curved concave outer face that increases in thickness in a direction from the interlayer plate portion toward the side wall plate portion.