Coolant circuit for a drive device and method for operating a coolant circuit

1. A coolant circuit for a drive device, comprising:

a first coolant sub-circuit and a second coolant sub-circuit, in each of which a device to be temperature-controlled is arranged,

wherein at least one coolant pump is present in each of the two coolant sub-circuits, which is designed in at least one of the coolant sub-circuits as a fluid pump having variable delivery direction,

wherein the first coolant sub-circuit and the second coolant sub-circuit are fluidically connected to one another via a first connection, the first connection comprising at least one connecting valve,

wherein the first coolant sub-circuit and the second coolant sub-circuit are further fluidically connected to one another via a second connection, separate from the first connection, the second connection comprising a connecting line with least a flow restrictor,

wherein the second cooling sub-circuit comprises a first and a second junction, and the first cooling sub-circuit comprises a fourth and a fifth junction,

wherein the first connection joins the second and fifth junctions, and the second connection joins the first and fourth junctions,

wherein the second coolant sub-circuit comprises a second check valve which fluidically bypasses the at least one coolant pump and the device to be temperature-controlled of the second coolant sub-circuit, and

wherein the second check valve bridges the second junction to a point along the second coolant sub-circuit which is opposite the at least one coolant pump and the device to be temperature-controlled of the second coolant sub-circuit from the second junction.

2. The coolant circuit as claimed in claim 1 , wherein the at least one connecting valve of the first connection is a check valve which is oriented to permit flow only from the second coolant sub-circuit to the first coolant sub-circuit.

3. The coolant circuit as claimed in claim 2 , wherein a branch line branches off from the second coolant sub-circuit at a third junction and rejoins the second coolant sub-circuit at the first junction, and

wherein the branch line comprises at least one heat exchanger and/or a branch line valve.

4. The coolant circuit as claimed in claim 3 , wherein the second coolant sub-circuit comprises:

a second check valve which fluidically bypasses the at least one coolant pump and the device to be temperature-controlled of the second coolant sub-circuit;

a third check valve which is fluidically arranged between the third junction and the second junction; and

a fourth check valve which is fluidically arranged between the first junction and the third junction.

5. The coolant circuit as claimed in claim 4 , wherein the second check valve is oriented to permit flow only from the point along the second coolant sub-circuit to the second junction,

wherein the third check valve is oriented to permit flow only from the third junction to the second junction, and

wherein the fourth check valve is oriented to permit flow only from the second junction to the first junction.

6. The coolant circuit as claimed in claim 5 , wherein a first check valve is arranged on the first coolant sub-circuit between the fourth and fifth junctions, in parallel with the at least one coolant pump and the device to be temperature-controlled of the first coolant sub-circuit, and

wherein the first check valve is oriented to permit flow only from the fifth junction to the first junction.

7. The coolant circuit as claimed in claim 1 , wherein a first check valve is arranged in the first coolant sub-circuit and is fluidically connected in series with the at least one coolant pump and the device to be temperature-controlled of the first coolant sub-circuit.

8. The coolant circuit as claimed in claim 1 , wherein a branch line branches off from the second coolant sub-circuit at a third junction and rejoins the second coolant sub-circuit at the first junction.

9. The coolant circuit as claimed in claim 8 , wherein the branch line comprises at least one heat exchanger and/or a branch line valve.

10. The coolant circuit as claimed in claim 1 , wherein a fourth check valve is fluidically arranged on the second coolant sub-circuit between the first junction and the third junction.

11. The coolant circuit as claimed in claim 10 , wherein the fourth check valve is oriented to permit flow only from the second junction to the first junction.

12. The coolant circuit as claimed in claim 11 , wherein a flow restrictor is provided upstream of the fourth check valve and downstream of the second junction.

13. The coolant circuit as claimed in claim 1 , wherein the second check valve is oriented to permit flow only from the point along the second coolant sub-circuit to the second junction.

14. The coolant circuit as claimed in claim 1 , wherein a branch line branches off from the second coolant sub-circuit at a third junction and rejoins the second coolant sub-circuit at the first junction, and

wherein a third check valve is fluidically arranged on the second coolant sub-circuit between the third junction and the second junction.

15. The coolant circuit as claimed in claim 14 , wherein the third check valve is oriented to permit flow only from the third junction to the second junction.

16. A method for operating a coolant circuit for a drive device, comprising:

providing a first coolant sub-circuit and a second coolant sub-circuit, in each of which a device to be temperature-controlled and is at least one coolant pump designed to have variable delivery direction are arranged,

selecting one operating parameter from a plurality of operating parameters of at least one of the coolant pumps, and

setting the at least one coolant pump according to the selected operating parameter,

wherein the first coolant sub-circuit and the second coolant sub-circuit are fluidically connected to one another via a first connection, the first connection comprising at least one connecting valve,

wherein the first coolant sub-circuit and the second coolant sub-circuit are further fluidically connected to one another via a second connection, separate from the first connection, the second connection comprising a connecting line with least a flow restrictor,

wherein the second cooling sub-circuit comprises a first and a second junction, and the first cooling sub-circuit comprises a fourth and a fifth junction,

wherein the first connection joins the second and fifth junctions, and the second connection joins the first and fourth junctions,

wherein the second coolant sub-circuit comprises a second check valve which fluidically bypasses the at least one coolant pump and the device to be temperature-controlled of the second coolant sub-circuit, and

wherein the second check valve bridges the second junction to a point along the second coolant sub-circuit which is opposite the at least one coolant pump and the device to be temperature-controlled of the second coolant sub-circuit from the second junction.

17. A coolant circuit for a drive device, comprising:

a first coolant sub-circuit and a second coolant sub-circuit, in each of which a device to be temperature-controlled is arranged,

wherein at least one coolant pump is present in each of the two coolant sub-circuits, which is designed in at least one of the coolant sub-circuits as a fluid pump having variable delivery direction,

wherein the first coolant sub-circuit and the second coolant sub-circuit are fluidically connected to one another via a first connection, the first connection comprising at least one connecting valve, and

wherein the first coolant sub-circuit and the second coolant sub-circuit are further fluidically connected to one another via a second connection, separate from the first connection, the second connection comprising a connecting line with least a flow restrictor,

wherein the second cooling sub-circuit comprises a first and a second junction, and the first cooling sub-circuit comprises a fourth and a fifth junction,

wherein the first connection joins the second and fifth junctions, and the second connection joins the first and fourth junctions, and

wherein a fourth check valve is fluidically arranged on the second coolant sub-circuit between the first junction and the third junction.