A battery pack, comprising: a battery module (40, 42, 44) having a bottom surface (1304, 1404, 1504); a cooling plate having a bottom pan and a top plate that are coupled together and define an interior region therebetween and extend along a longitudinal axis, the bottom surface of the battery module being disposed on the top plate of the cooling plate; the bottom pan including a bottom plate portion, outer side wall portions (82, 83, 84, 86, 88, 90, 92, 94, 96, 97, 98), inner side wall portions (110, 112, 114, 116), peripheral ledge portions (120, 124, 126, 128), triangular-shaped raised portions (150, 152, 198, 200, 250, 252, 298, 300), acute trapezoidal-shaped raised portions (154, 156, 158, 160, 174, 176, 178, 180, 194, 196, 254, 256, 258, 260, 274, 276, 278, 280, 294, 296) the bottom pan comprising bottom plate portion having a first, a second and a third cooling region (351, 352, 353) disposed underneath the battery module (40, 42, 44); the triangular-shaped raised portions and the acute trapezoidal-shaped raised portions being coupled to and extending in the direction away from the bottom plate portion directly contacting and being coupled to the top plate, and the triangular-shaped raised portions and trapezoidal-shaped raised portions are observed on a plane parallel to the bottom pan's plane; each of the first, second and third cooling regions comprising a first and a second flow path patterns (370, 570 and 770, 372, 572 and 772), the first flow path pattern has the shape of the second flow path pattern; the cooling regions comprising flow path patterns therein, intended to receive a refrigerant therethrough, are configured to maintain a temperature of at least a first half of a cross-sectional area of the battery module taken along a longitudinal plane within one degree Celsius of a first temperature level, the second flow path pattern configured to maintain a temperature of at least a second half of the cross-sectional area of the battery module taken along the longitudinal plane within one degree Celsius of the first temperature level; the first and second half of the cross-sectional area of the battery module being coincident and parallel with the longitudinal plane; the first flow path pattern including first flow channels (380, 382, 384, 386, 388, 390, 392, 394, 396, 398, 400) and the second flow path pattern including second flow channels (480, 482, 484, 486, 488, 490, 492, 494, 496, 498, 500); the inner side wall portion extending longitudinally along the longitudinal axis, the inner side wall portion being disposed between and separating the first flow path pattern from the second flow path pattern; and the peripheral ledge portions forming an outer periphery of the bottom pan and being co-planar with one another, and being coupled to the top plate. a battery module (40, 42, 44) having a bottom surface (1304, 1404, 1504); a cooling plate having a bottom pan and a top plate that are coupled together and define an interior region therebetween and extend along a longitudinal axis, the bottom surface of the battery module being disposed on the top plate of the cooling plate; the bottom pan including a bottom plate portion, outer side wall portions (82, 83, 84, 86, 88, 90, 92, 94, 96, 97, 98), inner side wall portions (110, 112, 114, 116), peripheral ledge portions (120, 124, 126, 128), triangular-shaped raised portions (150, 152, 198, 200, 250, 252, 298, 300), acute trapezoidal-shaped raised portions (154, 156, 158, 160, 174, 176, 178, 180, 194, 196, 254, 256, 258, 260, 274, 276, 278, 280, 294, 296) the bottom pan comprising bottom plate portion having a first, a second and a third cooling region (351, 352, 353) disposed underneath the battery module (40, 42, 44); the triangular-shaped raised portions and the acute trapezoidal-shaped raised portions being coupled to and extending in the direction away from the bottom plate portion directly contacting and being coupled to the top plate, and the triangular-shaped raised portions and trapezoidal-shaped raised portions are observed on a plane parallel to the bottom pan's plane; each of the first, second and third cooling regions comprising a first and a second flow path patterns (370, 570 and 770, 372, 572 and 772), the first flow path pattern has the shape of the second flow path pattern; the cooling regions comprising flow path patterns therein, intended to receive a refrigerant therethrough, are configured to maintain a temperature of at least a first half of a cross-sectional area of the battery module taken along a longitudinal plane within one degree Celsius of a first temperature level, the second flow path pattern configured to maintain a temperature of at least a second half of the cross-sectional area of the battery module taken along the longitudinal plane within one degree Celsius of the first temperature level; the first and second half of the cross-sectional area of the battery module being coincident and parallel with the longitudinal plane; the first flow path pattern including first flow channels (380, 382, 384, 386, 388, 390, 392, 394, 396, 398, 400) and the second flow path pattern including second flow channels (480, 482, 484, 486, 488, 490, 492, 494, 496, 498, 500); the inner side wall portion extending longitudinally along the longitudinal axis, the inner side wall portion being disposed between and separating the first flow path pattern from the second flow path pattern; and the peripheral ledge portions forming an outer periphery of the bottom pan and being co-planar with one another, and being coupled to the top plate.