Battery pack, treatment system and method for the production of a battery pack

A battery pack for supplying an electrically driven treatment apparatus with an electric driving power, the battery pack comprising:

• a stack housing, wherein the stack housing has a common housing opening defined by a housing edge;
• and
• a plurality of pouch cells having outer shells, wherein the plurality of pouch cells have cell tabs and are configured and disposed in a stack within the stack housing such that the cell tabs at least with tab parts project beyond at least one edge portion of the housing edge on the common housing opening without any housing wall or cover disposed between the tab parts and the outer shells, wherein the tab parts are directly electrically connected to each other solely by welded connections;
• a circuit board holding measuring electronics configured for measuring voltages of all of the plurality of pouch cells;
• wherein
• the housing edge defines an opening plane of the common housing opening,
• the tab parts extend in a stacking direction of the plurality of pouch cells in parallel to the opening plane,
• the stack housing is cuboid shaped and has at least four housing walls, wherein wall edges of four of the housing walls define the common housing opening,
• the at least four housing walls include a first housing wall and a second housing wall, the second housing wall is disposed opposite and with a distance to the first housing wall, the stack is disposed between the first housing wall and the second housing wall, and a height of the stack in a stack direction is limited by the first housing wall and the second housing wall,
• a frame, where in the frame supports the circuit board and is disposed on the common housing opening in parallel to the opening plane,
• wherein the circuit board is supported on an outer surface of the frame remote from the plurality of pouch cells,
• wherein the cell tabs and the circuit board are positioned in relation to each other by way of the stack housing and the frame, the frame having openings exposing the tab parts of the cell tabs;
• and
• at least one compensation element disposed in the stack between adjacent ones of the plurality of pouch cells,
• the at least one compensation element extends across a major part of a surface of the plurality of pouch cells and is configured to adjust the height of the stack to the distance between the first housing wall and the second housing wall across a compensation thickness of the at least one compensation element,
• the stack housing has a first housing part and a second housing part, the first housing part includes the first housing wall and a third housing wall of the at least four housing walls, the second housing part includes the second housing wall and a fourth housing wall of the at least four housing walls,
• the first housing part and the second housing part are mechanically connected to each other by at least one welded connection,
• when the first housing part and the second housing part are mechanically connected to each other, the fourth housing wall is disposed opposite and spaced apart from the third housing wall,
• none of the at least four housing walls overlaps another one of the at least four housing walls,
• the plurality of pouch cells are configured and disposed in the stack such that the cell tabs are disposed in two tab columns, wherein averted end limits of the tab columns define an intermediate zone,
• the circuit board is disposed within the intermediate zone and electrically connected, via electrical cell connectors, to a number of the cell tabs in each case by a welded connection,
• the electrical cell connectors in each case project beyond a board edge of the circuit board, and are disposed farther remote from the stack or outer shells of the plurality of pouch cells than the tab parts, and
• the cell tabs project beyond the at least one edge portion to an extent that allows for a common production step of the welded connections.