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A device for cooling a heat source of a motor vehicle, including a cooling body (7) which is in thermal contact with the heat source, a first fluid stream for the discharge of heat being capable of flowing to the cooling body (7), wherein at least one second fluid stream for the discharge of heat ca

A device for cooling a heat source of a motor vehicle, including a cooling body (7) which is in thermal contact with the heat source, a first fluid stream for the discharge of heat being capable of flowing to the cooling body (7), wherein at least one second fluid stream for the discharge of heat can flow selectably to the cooling body (7).

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1. A device for cooling a heat source of a motor vehicle, comprising a cooling body (7) which is in thermal contact with the heat source, a first fluid stream for the discharge of heat being capable of flowing to the cooling body (7), wherein at least one second fluid stream for the discharge of hea

1. A device for cooling a heat source of a motor vehicle, comprising a cooling body (7) which is in thermal contact with the heat source, a first fluid stream for the discharge of heat being capable of flowing to the cooling body (7), wherein at least one second fluid stream for the discharge of heat can flow selectably to the cooling body (7), wherein the heat source is an electrical energy accumulator, the first fluid stream being driven by a compressor (1) of a refrigerating circuit and the second fluid stream being driven by a circulating pump (6), wherein the device is operable in a first mode wherein the compressor (1) is off and the at least one second fluid stream flows along a flow path defined by the circulating pump (6), a condenser (2) and the cooling body (7) so that the at least one second fluid stream receives heat from the heat source, and a second mode wherein the compressor (1) is on and the first fluid stream flows along a flow path defined by the compressor (1), an evaporator (5), the cooling body (7), and the condenser (2) so that the first fluid stream receives heat from the heat source. 2. The device as claimed in claim 1, wherein the fluid of the first fluid stream is identical to the fluid of the second fluid stream. 3. The device as claimed in claim 2, wherein the fluid is a refrigerant, the first fluid stream being driven by the compressor (1) of a refrigerating circuit and the second fluid stream being driven by the circulating pump (6). 4. The device as claimed in claim 3 wherein the second fluid stream flows through a valve (9) following the cooling body (7). 5. The device as claimed in claim 3, wherein a first duct for the first fluid stream and a second duct for the second fluid stream are formed in the cooling body (7). 6. The device as claimed in claim 3, wherein the two fluid streams flow through the same duct in the cooling body. 7. The device as claimed in claim 6, wherein the selection of the fluid stream takes place via at least one switchable valve (11, 12). 8. The device as claimed in claim 3, wherein at least one of the fluid streams can flow to an electrical heating element (10) for the selectable heating of the heat source. 9. The device as claimed in claim 3, wherein the refrigerating circuit is a refrigerating circuit of an air conditioning system. 10. The device as claimed in claim 1, wherein a fluid of the first fluid stream is a refrigerant of the refrigerating circuit, and wherein the fluid of the second fluid stream is a coolant, separate from the first fluid, of a coolant circuit. 11. The device as claimed in claim 10, wherein the coolant circuit comprises the circulating pump (13) and a cooler (14) for the discharge of heat from the fluid. 12. The device as claimed in claim 10, wherein the coolant circuit has a heat exchanger (15, 22) for the selectable heating of the coolant. 13. The device as claimed in claim 12, wherein the heat exchanger (22) transmits heat from a braking action of the vehicle to the fluid. 14. The device as claimed in claim 10, wherein a further heat source (19) can be cooled by means of the refrigerant circuit or the coolant circuit. 15. The device as claimed in claim 10, wherein the cooling body (7) can be separated selectably from the coolant circuit by means of a valve (17, 18). 16. The device as claimed in claim 1, wherein an electrical heating element (16) for the selectable heating of the heat source is arranged in the cooling body. 17. The device as claimed in claim 1, wherein a fluid of the first fluid stream is a refrigerant of a refrigerating circuit, and wherein a throttle element is provided, downstream of the cooling body (7), in the refrigerating circuit. 18. The device as claimed in claim 1, wherein a fluid of the first fluid stream is a refrigerant of a refrigerating circuit wherein a clock valve, is provided, upstream of the cooling body (7), in the refrigerating circuit, so that a clocked supply of refrigerant into the cooling body (7) becomes possible. 19. The device as claimed in claim 1, wherein the electrical energy accumulator is a lithium ion battery (23).