A battery module, comprising: a housing having an electrically non-conductive oil disposed therein; battery cells (72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146) disposed in the housing that contact the electrically non-conductive oil; and first (170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234,236,238,240,242, 244) and second (270, 272, 274, 276, 278, 280, 282, 284, 286, 288, 290, 292, 294, 296, 298, 300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 326, 328, 330, 332, 334, 336, 338, 340, 342, 344) heat conductive fins disposed in the housing that contacts the electrically non-conductive oil, the first and second heat conductive fins configured to extract heat energy from the electrically non-conductive oil, wherein the battery module is characterized in that the battery module further comprises first and second conduits (250, 350) extending through the first and second heat conductive fins, respectively, the first and second conduits configured to receive first and second portions of a fluid, respectively, therethrough and to conduct heat energy from the first and second heat conductive fins, respectively, into the fluid to cool the battery cell, and wherein the first and second heat conductive fins are triangular-shaped sheets and disposed proximate to first and second ends, respectively, of the battery cell, wherein each of the battery cells includes a body portion and flange portions (382, 384), and a pair of electrodes extending upwardly from the body portion, and the flange portions extend from first and second ends of the body portion, and the battery cells are stacked proximate to one another within a lower housing portion of the housing, wherein the first heat conductive fins are disposed in the housing proximate to first ends of the battery cells, and wherein the second heat conductive fins are disposed in the housing proximate to second ends of the battery cells. a housing having an electrically non-conductive oil disposed therein; battery cells (72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146) disposed in the housing that contact the electrically non-conductive oil; and first (170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234,236,238,240,242, 244) and second (270, 272, 274, 276, 278, 280, 282, 284, 286, 288, 290, 292, 294, 296, 298, 300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 326, 328, 330, 332, 334, 336, 338, 340, 342, 344) heat conductive fins disposed in the housing that contacts the electrically non-conductive oil, the first and second heat conductive fins configured to extract heat energy from the electrically non-conductive oil, wherein the battery module is characterized in that the battery module further comprises first and second conduits (250, 350) extending through the first and second heat conductive fins, respectively, the first and second conduits configured to receive first and second portions of a fluid, respectively, therethrough and to conduct heat energy from the first and second heat conductive fins, respectively, into the fluid to cool the battery cell, and wherein the first and second heat conductive fins are triangular-shaped sheets and disposed proximate to first and second ends, respectively, of the battery cell, wherein each of the battery cells includes a body portion and flange portions (382, 384), and a pair of electrodes extending upwardly from the body portion, and the flange portions extend from first and second ends of the body portion, and the battery cells are stacked proximate to one another within a lower housing portion of the housing, wherein the first heat conductive fins are disposed in the housing proximate to first ends of the battery cells, and wherein the second heat conductive fins are disposed in the housing proximate to second ends of the battery cells.