Bus bar module and power supply unit

1. A bus bar module comprising:

a plurality of bus bars in which a plurality of battery cells of a battery assembly electrically connect to each other;

a plurality of electric wires electrically connected to the plurality of bus bars; and

an electric wire routing structure that accommodates the plurality of electric wires,

wherein the electric wire routing structure includes a plurality of electric wire routing grooves formed in an upwardly opening gutter shape and disposed along an overlapping direction of the plurality of battery cells, and a plurality of lids connected to first side walls of the plurality of electric wire routing grooves via hinges so as to be rotatable and covering the plurality of electric wire routing grooves so as to block groove openings of the plurality of electric wire routing grooves, respectively,

wherein groove-side hinges and lid-side hinges are alternately set to be offset from each other in the overlapping direction of the plurality of battery cells, the groove-side hinges directly connecting the plurality of electric wire routing grooves to each other so that the connected electric wire routing grooves are movable, and the lid-side hinges connecting the plurality of lids to each other so that the connected lids are movable,

wherein either the groove-side hinge between two adjacent electric wire routing grooves of the plurality of electric wire routing grooves or the lid-side hinge between two adjacent lids of the plurality of the lids is disposed in a direction perpendicular to the overlapping direction,

wherein the plurality of electric wire routing grooves have second side walls opposite the first side walls, the first side walls and the second side walls both extending along the overlapping direction, and

wherein the groove-side hinges are directly connected to the second side walls.

2. A power supply unit comprising:

a battery assembly that includes a plurality of battery cells; and

a bus bar module according to claim 1 , attached to and overlapped with the battery assembly and electrically connecting the plurality of battery cells to each other.

3. The bus bar module according to claim 1 , wherein the bus bar module forms a power supply unit that is used in a hybrid vehicle or an electric vehicle.

4. The bus bar module according to claim 1 ,

wherein the battery assembly includes the plurality of battery cells that are disposed in a row along one direction and a battery resin frame that fixes the plural batteries together.

5. The bus bar module according to claim 1 ,

wherein the bus bar module includes plural bus bars, the plurality of voltage detection terminals, the plurality of electric wires, and the electric wire routing structure formed of an insulating resin.

6. The bus bar module according to claim 1 ,

wherein the plurality of bus bars are placed in a plurality of corresponding bus bar accommodation portions, and

the plurality of groove-side hinges are separate and spaced away from the plurality of bus bar accommodation portions.

7. The bus bar module according to claim 1 ,

wherein the plurality of groove-side hinges and the plurality of electric wire routing grooves are aligned with each other along an overlapping direction of the plurality of battery cells.

8. The bus bar module according to claim 1 ,

wherein each of the plurality of groove-side hinges are formed between an adjacent pair of the plurality of electric wire routing grooves.