Cell connection unit for a battery module

A cell connection unit (CCU) for connecting a plurality of aligned battery cells of a battery module, the CCU comprising:

• a plurality of busbars, each busbar of the plurality of busbars being connected to cell terminals of at least two battery cells of the plurality of aligned battery cells;
• and
• a plurality of carrier rails, at least some carrier rails of the plurality of carrier rails being mechanically connected to at least three busbars of the plurality of busbars,
• wherein each of the at least some carrier rails of the plurality of carrier rails is connected to three separate busbars of the plurality of busbars and includes:
• a first reception region at one end and connected to one busbar of the at least three busbars of the plurality of busbars, and receives the one busbar, and
• a separate second reception region at another end and connected to two busbars of the at least three busbars of the plurality of busbars, the second reception region extending completely between the two busbars to physically separate the two busbars and electrically insulate the two busbars from each other, and the second reception region receiving the two busbars from opposite directions,
• wherein the first reception region has a U-shape that wraps around a bottom surface, a side surface, and a top surface of a middle portion of the one busbar,
• wherein the second reception region has a first reception aperture and a second reception aperture shifted with respect to the first reception aperture along a lengthwise direction of a carrier rail of the at least some carrier rails, the first reception aperture and the second reception aperture accommodating the two busbars of the at least three busbars,
• wherein each carrier rail of the plurality of carrier rails extends in a lengthwise direction that is orthogonal to a lengthwise direction of each busbar of the plurality of busbars, and
• wherein tops of the first and second reception apertures are coplanar with each other, and bottoms of the first and second reception apertures are coplanar with each other.