Busbar module
A busbar module includes: a circuit body having a flexible circuit board; busbars; and a holder. The circuit body has: conductor layers and protective layers to form a multiple-layered structure of wiring patterns; a band-shaped main strip to be located to extend in a stacking direction of cells; and a band-shaped branch strip branched from the main strip. The branch strip has: a bent portion extending in the stacking direction and having a bent shape around an axis crossing the stacking direction; and a connection portion disposed closer to an end of the branch strip than the bent portion and connected to the corresponding busbar. The bent portion has a thin-layer portion having a shape formed by removing, from the flexible circuit board, a part of the protective layers corresponding to a part of the conductor layers without being used as the wiring pattern in the branch strip.
1. A busbar module to be attached to a battery assembly having a stack of a plurality of cells, the busbar module comprising:
a circuit body having a flexible circuit board including wiring patterns;
a plurality of busbars to be connected to corresponding electrodes of the plurality of the cells; and
a holder holding the busbars and being extendable in a stacking direction of the plurality of the cells,
the circuit body having:
a plurality of conductor layers and a plurality of protective layers to form a multiple-layered structure of the wiring patterns;
a band-shaped main strip to be located to extend in the stacking direction; and
a band-shaped branch strip branched from the main strip, the branch strip having:
a bent portion extending in the stacking direction and having a bent shape around an axis crossing the stacking direction; and
a connection portion disposed closer to an end of the branch strip than the bent portion and connected to a corresponding one of the busbars,
the bent portion having a thin-layer portion having a shape formed by removing, from the flexible circuit board, a part of the protective layers corresponding to a part of the conductor layers not being used as the wiring pattern in the branch strip,
wherein a part of the wiring pattern passing through the thin-layer portion is thinner than other parts of the wiring pattern passing through a portion other than the thin-layer portion.
2. The busbar module according to claim 1 , wherein
the branch strip has a curved boundary shape between the thin-layer portion and a portion other than the thin-layer portion to be convex to separate from the thin-layer portion in a longitudinal direction of the branch strip.