A battery module, comprising: a first battery cell; a first frame member having a first substantially rectangular ring-shaped outer plastic frame and a first heat exchanger; the first heat exchanger having first and second thermally conductive plates (360, 362) being coupled together and defining a first flow path portion extending therethrough, the first flow path portion having at least first and second flow path subportions (550, 552 and 554, 556) each extending through the first and second thermally conductive plates (360, 362); the first substantially rectangular ring-shaped outer plastic frame being coupled around an outer peripheral region of the first and second thermally conductive plates (360, 362); the first substantially rectangular ring-shaped outer plastic frame having first, second, third, and fourth side walls (280, 282, 284, 286); the first and second side walls (280, 282) extending substantially parallel to one another; the third and fourth side walls (284, 286) being coupled between the first and second side walls (280, 282) and extending substantially parallel to one another and perpendicular to the first and second side walls (280, 282); the first side wall having first and second apertures (300, 302) extending therethrough that communicate with the first and second flow path subportions (550, 552 and 554, 556), respectively; the second side wall having third and fourth apertures (310, 312) extending therethrough that communicate with the first and second flow path subportions (550, 552 and 554, 556), respectively; the first battery cell being disposed on and against a first side of the first thermally conductive plate; characterized in that the battery module further comprises a second battery cell disposed on and against the first side of the first thermally conductive plate, the second battery cell being further disposed proximate to the first battery cell, and in that an insulating layer is disposed between the first frame member and the first and second battery cells (170, 200), the frame member and the insulating layer holding the battery cells (170, 200) therebetween. a first battery cell; a first frame member having a first substantially rectangular ring-shaped outer plastic frame and a first heat exchanger; the first heat exchanger having first and second thermally conductive plates (360, 362) being coupled together and defining a first flow path portion extending therethrough, the first flow path portion having at least first and second flow path subportions (550, 552 and 554, 556) each extending through the first and second thermally conductive plates (360, 362); the first substantially rectangular ring-shaped outer plastic frame being coupled around an outer peripheral region of the first and second thermally conductive plates (360, 362); the first substantially rectangular ring-shaped outer plastic frame having first, second, third, and fourth side walls (280, 282, 284, 286); the first and second side walls (280, 282) extending substantially parallel to one another; the third and fourth side walls (284, 286) being coupled between the first and second side walls (280, 282) and extending substantially parallel to one another and perpendicular to the first and second side walls (280, 282); the first side wall having first and second apertures (300, 302) extending therethrough that communicate with the first and second flow path subportions (550, 552 and 554, 556), respectively; the second side wall having third and fourth apertures (310, 312) extending therethrough that communicate with the first and second flow path subportions (550, 552 and 554, 556), respectively; the first battery cell being disposed on and against a first side of the first thermally conductive plate; characterized in that the battery module further comprises a second battery cell disposed on and against the first side of the first thermally conductive plate, the second battery cell being further disposed proximate to the first battery cell, and in that an insulating layer is disposed between the first frame member and the first and second battery cells (170, 200), the frame member and the insulating layer holding the battery cells (170, 200) therebetween.