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

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.