A battery module (22, 122) comprising: - a plurality of electrochemical cells (24, 124) arranged within the battery module (22, 122); and - a thermal management system (60, 160) configured to provide thermal management to the plurality of electrochemical cells (24, 124), the thermal management system (60, 160) comprising; - a first thermal plate (61, 161) provided adjacent a first side of the battery module (22, 122); and - a second thermal plate (62, 162) provided adjacent a second side of the battery module (22, 122) opposite that of the first side of the battery module (22, 122); wherein the first thermal plate (61, 161) comprises a plurality of first integral fins (64, 164) that extends from the first thermal plate (61, 161) toward the second side of the battery module (22, 122), wherein the second thermal plate (62, 162) comprises a plurality of second integral fins (64, 164) that extends from the second thermal plate (62, 162) toward the first side of the battery module (22, 122), wherein the plurality of first and second integral fins (64, 164) comprise free ends, characterized in that the plurality of first integral fins (64, 164) and the plurality of second integral fins (64, 164) are arranged in an alternating order such that cooling or heating of at least one of the plurality of electrochemical cells (24, 124) is provided along a first side of the at least one electrochemical cell (24, 124) by a fin (64, 164) of the plurality of first integral fins (64, 164) and along a second side of the at least one electrochemical cell (24, 124) by a fin (64, 164) of the plurality of second integral fins (64, 164). - a plurality of electrochemical cells (24, 124) arranged within the battery module (22, 122); and - a thermal management system (60, 160) configured to provide thermal management to the plurality of electrochemical cells (24, 124), the thermal management system (60, 160) comprising; - a first thermal plate (61, 161) provided adjacent a first side of the battery module (22, 122); and - a second thermal plate (62, 162) provided adjacent a second side of the battery module (22, 122) opposite that of the first side of the battery module (22, 122); wherein the first thermal plate (61, 161) comprises a plurality of first integral fins (64, 164) that extends from the first thermal plate (61, 161) toward the second side of the battery module (22, 122), wherein the second thermal plate (62, 162) comprises a plurality of second integral fins (64, 164) that extends from the second thermal plate (62, 162) toward the first side of the battery module (22, 122), wherein the plurality of first and second integral fins (64, 164) comprise free ends, characterized in that the plurality of first integral fins (64, 164) and the plurality of second integral fins (64, 164) are arranged in an alternating order such that cooling or heating of at least one of the plurality of electrochemical cells (24, 124) is provided along a first side of the at least one electrochemical cell (24, 124) by a fin (64, 164) of the plurality of first integral fins (64, 164) and along a second side of the at least one electrochemical cell (24, 124) by a fin (64, 164) of the plurality of second integral fins (64, 164). - a first thermal plate (61, 161) provided adjacent a first side of the battery module (22, 122); and - a second thermal plate (62, 162) provided adjacent a second side of the battery module (22, 122) opposite that of the first side of the battery module (22, 122);