Battery module
The disclosure provides a battery module. The battery module includes a battery stacked body, which includes stacked batteries; cooling plates that are installed at the tail ends in a battery stacking direction of the battery stacked body, and the cooling plates and the battery stacked body are installed in a thermal insulation mode; and heat transfer device that are in thermal contact with the cooling plates, and heat of the batteries is transferred to the cooling plates through the heat transfer device; wherein in a normal charging-discharging state, the battery with the highest temperature in the battery stacked body is a battery A; and between a single cooling plate and the battery A, a thermal resistance between each battery and the heat transfer device is reduced along with the increase of a distance between the each battery and the cooling plate in the battery stacking direction.
1. A battery module, comprising:
a battery stacked body, wherein the battery stacked body comprises a plurality of stacked batteries;
a cooling plate, wherein the cooling plate is provided at a tail end in a battery stacking direction of the battery stacked body, and the cooling plate and the battery stacked body are provided in a thermal insulation manner; and
a heat transfer device, wherein the heat transfer device is in thermal contact with the cooling plate, and heat of the batteries is transferred to the cooling plate through the heat transfer device;
wherein in a working state, a battery with a highest temperature in the battery stacked body is a battery A; and between the cooling plate and the battery A, as a distance between each of the plurality of batteries and the cooling plate in the battery stacking direction is increased, a thermal resistance between the each of the plurality of batteries and the heat transfer device is reduced.
2. The battery module as cl aimed in claim 1 , wherein the battery stacked body further comprises heat-conducting fins, each battery at least contacts with one heat-conducting fin, and the heat-conducting fins are in thermal contact with the heat transfer device.
3. The battery module as claimed in claim 2 , wherein between the cooling plate and the battery A, a distance between each of the heat-conducting fins and the cooling plate in, the battery stacking direction is increased, a thickness of the each of the heat-conducting fins is increased.
4. The battery module as claimed in claim 2 , wherein between the cooling plate and the battery A, as a distance between the each of the plurality of batteries and the cooling plate in the battery stacking direction is increased, a thermal contact area between the each of the plurality of batteries and a corresponding heat-conducting fin in the heat-conducting fins is enlarged.
5. The battery module as claimed in claim 2 , wherein each of the heat-conducting fins is provided with at least one through hole; and between the cooling plate and the battery A, as a distance between the each of the heat-conducting fins and the cooling plate in the battery stacking direction is increased, a total cross-sectional area of the at least one through hole in the each of the heat-conducting fins is reduced.
6. The battery module as claimed in claim 2 , wherein each of the heat-conducting fins is provided with a bending portion, and is in thermal contact with the heat transfer device through the bending portion; and between the cooling plate and the battery A, as a distance between the each of the heat-conducting fins and the cooling plate in the battery stacking direction is increased, a thermal contact area between the bending portion of the each of the heat-conducting fins and the heat transfer device is enlarged.
7. The battery module as claimed in claim 6 , wherein the bending portion is provided with at least one through hole; and between the cooling plate and the battery A, as a distance between the each of the heat-conducting fins and the cooling plate in the battery stacking direction is increased, a total cross-sectional area of the at least one through hole in the bending portion of the each of the heat-conducting fins is reduced.
8. The battery module as claimed in claim 6 , wherein one side, in thermal contact with the heat transfer device, of the bending portion is provided with a groove, and the groove is not in thermal contact with the heat transfer device; and between the cooling plate and the battery A, in the battery stacking direction, as a distance between the each of the heat-conducting fins and the cooling plate is increased, a total area of the groove at the side, in thermal contact with the heat transfer device, of the bending portion of the each of the heat-conducting fins is reduced.
9. The battery module as claimed in claim 1 , wherein the batteries comprised in the battery stacked body are stacked in a vertical direction.
10. The battery module as claimed in claim 1 , wherein there are two heat transfer devices, and the heat transfer devices are respectively provided at two opposite sides of the battery stacked body.
11. The battery module as claimed in claim 1 , wherein the cooling plate is provided with a liquid inlet and a liquid outlet.
12. The battery module as claimed in claim 1 , wherein two tail ends of the battery stacked body in the battery stacking direction are provided with the cooling plate.
13. The battery module as claimed in claim 1 , wherein a thermal-insulating layer is provided between the cooling plate and the battery stacked body.