A battery module, comprising: - a housing; - a plurality of battery cells disposed in the housing and surrounded by interior walls of the housing, wherein each of the plurality of battery cells comprises a first terminal having a first material and a second terminal; - a plurality of bus bar cell interconnects comprising the first material, wherein each of the plurality of bus bar cell interconnects is configured to electrically couple two adjacent battery cells of the plurality of battery cells via an electrical coupling with the first terminal of one of the adjacent battery cells and the second terminal of the other adjacent battery cell; - a printed circuit board, PCB, installed in the battery module such that the PCB is arranged over a central portion of each respective battery cells; - a plurality of first welds, wherein each first weld is disposed at a corresponding first welding point and directly couples a corresponding bus bar cell interconnect of the plurality of bus bar cell interconnects with a corresponding one of the first terminals comprising the first material, wherein each first welding point is welded from a position above the plurality of battery cells after the plurality of bus bar cell interconnects are disposed over the plurality of battery cells and after the PCB has been installed; - a terminal post connector for outputting a voltage from the plurality of battery cells, the terminal post connector comprising the first material; and - a shunt disposed on a side of the printed circuit board, PCB, of the battery module opposite to the side of the printed circuit board, PCB, facing the battery cells for carrying current from the plurality of battery cells to the terminal post connector, wherein the shunt is disposed on a lateral portion of the PCB that extends over the edge of one of the interior walls of the housing; wherein the terminal post connector is welded to the shunt at a first shunt welding point, wherein the first shunt welding point is accessible from above the plurality of battery cells. - a housing; - a plurality of battery cells disposed in the housing and surrounded by interior walls of the housing, wherein each of the plurality of battery cells comprises a first terminal having a first material and a second terminal; - a plurality of bus bar cell interconnects comprising the first material, wherein each of the plurality of bus bar cell interconnects is configured to electrically couple two adjacent battery cells of the plurality of battery cells via an electrical coupling with the first terminal of one of the adjacent battery cells and the second terminal of the other adjacent battery cell; - a printed circuit board, PCB, installed in the battery module such that the PCB is arranged over a central portion of each respective battery cells; - a plurality of first welds, wherein each first weld is disposed at a corresponding first welding point and directly couples a corresponding bus bar cell interconnect of the plurality of bus bar cell interconnects with a corresponding one of the first terminals comprising the first material, wherein each first welding point is welded from a position above the plurality of battery cells after the plurality of bus bar cell interconnects are disposed over the plurality of battery cells and after the PCB has been installed; - a terminal post connector for outputting a voltage from the plurality of battery cells, the terminal post connector comprising the first material; and - a shunt disposed on a side of the printed circuit board, PCB, of the battery module opposite to the side of the printed circuit board, PCB, facing the battery cells for carrying current from the plurality of battery cells to the terminal post connector, wherein the shunt is disposed on a lateral portion of the PCB that extends over the edge of one of the interior walls of the housing;