Thermal management device for the batteries of an electric or hybrid vehicle

1 . A thermal management device for an electric or hybrid motor vehicle, the thermal management device comprising:

a reversible circulation circuit configured to circulate a refrigerant fluid and which comprises:

a main loop, having, in the direction of circulation of the refrigerant fluid:

a compressor,

a first internal heat exchanger configured to directly or indirectly heat a flow of internal air en route to a vehicle interior of the electric or hybrid motor vehicle,

a first expansion device, and

a first heat exchanger;

a first bypass branch, which is connected in parallel at least with the first heat exchanger,

wherein the first bypass branch connects a first junction point disposed on the main loop upstream of the first expansion device, between the first internal heat exchanger and the first expansion device, to a second junction point disposed on the main loop upstream of the compressor, between the first heat exchanger and the compressor,

wherein the first bypass branch comprises a second expansion device disposed upstream of a cooler, and

wherein the cooler is configured to cool at least one of batteries or an electric powertrain of the electric or hybrid motor vehicle; and

a second bypass branch for bypassing the first internal heat exchanger and the first expansion device.

2 . The thermal management device as claimed in claim 1 ,

wherein the first heat exchanger is disposed both on the reversible circulation circuit and on an auxiliary circuit in which a heat transfer fluid is configured to circulate.

3 . The thermal management device as claimed in claim 1 ,

wherein the reversible circulation circuit comprises a third bypass branch connected in parallel with the second expansion device and with the cooler, and

wherein the third bypass branch comprises a third expansion device disposed upstream of an evaporator, through which the flow of internal air en route to the vehicle interior is configured to pass.

4 . The thermal management device as claimed in claim 1 ,

wherein the second bypass branch connects a third junction point disposed on the main loop downstream of the compressor, between the compressor and the first internal heat exchanger, to a fourth junction point disposed on the main loop downstream of the first expansion device, between the first expansion device and the first heat exchanger.

5 . The thermal management device as claimed in claim 4 ,

Wherein a third bypass branch connects a fifth junction point disposed on the first bypass branch upstream of the second expansion device, between a first junction point and the second expansion device, to a sixth junction point disposed on the first bypass branch downstream of the cooler, between the cooler and a second junction point,

the reversible circulation circuit further comprising a fourth bypass branch connecting a seventh junction point disposed on the main loop downstream of the first heat exchanger, between the first heat exchanger and the second junction point, to an eighth junction point disposed upstream of a third expansion device, on the first bypass branch or the third bypass branch.

6 . The thermal management device as claimed in claim 5 ,

wherein the reversible circulation circuit comprises a second internal heat exchanger configured to allow exchanges of heat between a first side disposed on the fourth bypass branch and a second side disposed on the first bypass branch or on the third bypass branch, downstream of an evaporator.

7 . The thermal management device as claimed in claim 1 ,

wherein the second bypass branch connects a third junction point disposed on the main loop downstream of the compressor, between the compressor and the first internal heat exchanger, to a fourth junction point disposed on the main loop upstream of a second junction point, between the first heat exchanger and the second junction point,

wherein the first heat exchanger is configured to allow the circulation of refrigerant fluid within it in one direction or the other.

8 . The thermal management device as claimed in claim 7 ,

wherein a third bypass branch connects a fifth junction point disposed on the first bypass branch upstream of the second expansion device, between a first junction point and the second expansion device, to a sixth junction point disposed on the first bypass branch downstream of the cooler, between the cooler and the second junction point,

the reversible circulation circuit moreover comprising a fourth bypass branch connecting a seventh junction point disposed on the main loop downstream of the first heat exchanger, between the first expansion device and the first heat exchanger, to an eighth junction point disposed upstream of a third expansion device, on the first bypass branch or the third bypass branch.

9 . The thermal management device as claimed in claim 8 ,

wherein the reversible circulation circuit comprises a second internal heat exchanger configured to allow exchanges of heat between a first side disposed on the fourth bypass branch and a second side disposed on the first bypass branch or on the third bypass branch, downstream of an evaporator.

10 . The thermal management device as claimed in claim 7 ,

wherein a third bypass branch connects a fifth junction point disposed on the first bypass branch upstream of the second expansion device, between a first junction point and the second expansion device, to a sixth junction point disposed on the first bypass branch downstream of the cooler, between the cooler and the second junction point,

the reversible circulation circuit further comprising a fourth bypass branch connecting a seventh junction point disposed on the main loop downstream of the first expansion device, between the first expansion device and the first heat exchanger, to an eighth junction point disposed on the main loop upstream of the first expansion device, between the first internal heat exchanger and the first expansion device.

11 . The thermal management device as claimed in claim 10 ,

wherein the reversible circulation circuit comprises a second internal heat exchanger configured to allow exchanges of heat between a first side disposed on the fourth bypass branch and a second side disposed on the first bypass branch or on the third bypass branch downstream of an evaporator.

12 . The thermal management device as claimed in claim 7 ,

wherein an third bypass branch connects a fifth junction point disposed on the main loop downstream of a first junction point, between the first junction point and the first expansion device, to a sixth junction point disposed on the first bypass branch downstream of the cooler, between the cooler and the second junction point,

wherein the first expansion device is also configured to allow the circulation of the refrigerant fluid within it in one direction or the other.

13 . The thermal management device as claimed in claim 12 ,

wherein the reversible circulation circuit comprises a second internal heat exchanger configured to allow exchanges of heat between a first side disposed on the main loop upstream of the first expansion device between the fifth junction point and the first expansion device and a second side disposed on the first bypass branch or on the third bypass branch downstream of an evaporator,

wherein the second internal heat exchanger is configured to allow the circulation of the refrigerant fluid within its first side in one direction or the other.

14 . The thermal management device as claimed in claim 1 ,

wherein the first bypass branch connects a first junction point disposed on the main loop downstream of the first expansion device, between the first expansion device and the first heat exchanger, to a second junction point disposed on the main loop upstream of the compressor, between the first heat exchanger and the compressor,

wherein the second bypass branch connects a third junction point disposed on the main loop downstream of the compressor, between the compressor and the first internal heat exchanger, to a fourth junction point disposed on the main loop upstream of the second junction point, between the first heat exchanger and the second junction point,

wherein the first heat exchanger is configured to allow the circulation of refrigerant fluid within it in one direction or the other.