A battery unit comprises a battery case, and a plurality of battery modules stored and held in the battery case. The battery case includes a bottom wall and a partition. The plurality of battery modules are mounted on the bottom wall. The partition is provided and erected on the bottom wall. The partition separates the battery modules adjacent in a second direction traversing a first direction. The first direction is oriented from a first end of the battery case at which an inlet is formed to a second end at which an outlet is formed. The partition extends along a plane where the battery modules face each other in the second direction along the battery modules. The partition is inclined in the extending direction.
1. A battery unit comprising:
a battery case having an inlet to let in a cooling gas and an outlet to let out the gas; and
a plurality of battery modules stored and held in the battery case, wherein
the battery case includes,
a front battery storage, formed in a front side of the battery case, which contains an inlet side battery module group comprising a part of the plurality of the battery modules,
a rear battery storage, formed in a rear side of the battery case, which contains an outlet side battery module group comprising a part of the plurality of the battery modules, and
a central battery storage and an electric circuit storage formed between the front battery storage and the rear battery storage,
the battery case having a passage extending between the front battery storage and the rear battery storage to allow the cooling gas to flow from the front battery storage to the rear battery storage, and the passage extending at a position not in contact with the electric circuit storage to prevent the cooling gas from flowing into the electric circuit storage,
wherein the battery case includes,
a tray member on which the battery modules are disposed,
a cover member which covers the tray member, and
the cover member has a concaved position, at a position opposing the electric circuit storage, concaved to a lower direction of a vehicle than at positions opposing the front battery storage and the rear battery storage, and
wherein the cover member includes a tunnel, and
the tunnel is arranged in a position opposing the electric circuit storage, and a section thereof rises in an upper direction.
2. The battery unit according to claim 1 , wherein,
the concaved position opposes a recess of a floor panel of a vehicle arranged above the battery case.
3. The battery unit according to claim 1 , wherein,
a two-way flow passageway for cooling air which diverges in both of a width direction of the vehicle is disposed in a rear direction of the vehicle of the tunnel formed in the cover member.