Coolant circulation system with backup

Abstract

The application discloses a cooling liquid circulating system with backup, which comprises an air conditioner refrigerant circulating loop (3), a cooling liquid refrigerant circulating loop (2) and a cooling liquid circulating loop (1), wherein the air conditioner refrigerant circulating loop (3), the cooling liquid refrigerant circulating loop (2) and the cooling liquid circulating loop (1) share a same cooling liquid evaporator (24); the refrigerants of the air conditioner refrigerant circulating loop (3) and the cooling liquid refrigerant circulating loop (2) can respectively exchange heat with the cooling liquid of the cooling liquid circulating loop (1) through the cooling liquid evaporator (24). The application takes the air conditioner refrigerant circulation of a new energy vehicle as the refrigerant circulation backup of the cooling liquid circulation for battery cooling, improves the reliability of the battery cooling system, prevents the occurrence of irreversible accidents such as battery thermal runaway and vehicle spontaneous combustion.

Description

Technical Field

[0001] The present invention relates to the field of coolant circulation systems, and specifically to a coolant circulation system with a backup. Background Art

[0002] Currently, the batteries of new energy vehicles generally use coolant circulation for cooling, and at the same time, the vehicle has an air conditioner. Both the coolant circulation and the air conditioner have their own refrigerant circulations, and the two refrigerant circulations are independent of each other. When a failure occurs in the refrigerant circulation supporting the coolant circulation, the coolant cannot be cooled by the refrigerant circulation supporting the air conditioner, which may lead to thermal runaway of the battery and accidents such as spontaneous combustion. Summary of the Invention

[0003] The present invention provides a coolant circulation system with a backup, which uses the refrigerant circulation of the air conditioner to back up the refrigerant circulation of the coolant circulation to solve the problem that there is no replacement when a failure occurs in the refrigerant circulation configured for the battery coolant circulation in the prior art new energy vehicles.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The coolant circulation system with a backup includes an air conditioner refrigerant circulation circuit (3), a coolant refrigerant circulation circuit (2), and a coolant circulation circuit (1). Refrigerants circulate separately in the air conditioner refrigerant circulation circuit (3) and the coolant refrigerant circulation circuit (2), and coolant circulates in the coolant circulation circuit (1); The air conditioner refrigerant circulation circuit (3), the coolant refrigerant circulation circuit (2), and the coolant circulation circuit (1) share the same coolant evaporator (24); the coolant evaporator (24) has one coolant channel and two refrigerant channels; the coolant channel of the coolant evaporator (24) is added to the coolant circulation circuit (1) for coolant to pass through, the first refrigerant channel of the coolant evaporator (24) is added to the coolant refrigerant circulation circuit (2) for the corresponding refrigerant to pass through, and the second refrigerant channel of the coolant evaporator (24) is added to the air conditioner refrigerant circulation circuit (3) for the corresponding refrigerant to pass through; the refrigerants in the air conditioner refrigerant circulation circuit (3) and the coolant refrigerant circulation circuit (2) can respectively exchange heat with the coolant in the coolant circulation circuit (1) through the coolant evaporator (24).

[0005] Further, the coolant circulation circuit (1) includes a cold liquid tank (11), a liquid supply pump (12), and a heat load (13), and the cold liquid tank (11) is connected in a loop through the liquid supply pump (12), the coolant channel of the coolant evaporator (24), and the heat load (13).

[0006] Furthermore, the coolant refrigerant circulation loop (2) includes a compressor (21), a condenser (22), and a throttling device (23), and the first refrigerant passage of the compressor (21), condenser (22), throttling device (23), and coolant evaporator (24) forms a loop connection.

[0007] Furthermore, the air conditioning refrigerant circulation loop (3) includes an air conditioning compressor (31), an air conditioning condenser (32), an air conditioning flow regulating device (33), and an air conditioning evaporator (34), and the second refrigerant channel of the air conditioning compressor (31), air conditioning condenser (32), air conditioning flow regulating device (33), air conditioning evaporator (34), and coolant evaporator (24) forms a loop connection.

[0008] Furthermore, the air conditioner evaporator (34) is connected in parallel with an air conditioner evaporator valve (35).

[0009] Furthermore, the second refrigerant passage of the coolant evaporator (24) is connected in parallel with a coolant evaporator valve (36).

[0010] Compared with existing technologies, this invention uses the air conditioning refrigerant cycle of new energy vehicles as a backup for the coolant cycle of battery cooling. When the coolant cycle itself fails, it can be replaced by the air conditioning refrigerant cycle, thereby improving the reliability of the battery cooling system and preventing irreversible accidents such as battery thermal runaway and vehicle spontaneous combustion. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1 As shown, this embodiment discloses a coolant circulation system with backup, including a coolant circulation loop 1 and its matching coolant-refrigerant circulation loop 2, as well as a separate air conditioning refrigerant circulation loop 3. The three share the same coolant evaporator 24, which has one coolant channel and two refrigerant channels.

[0014] The coolant circulation loop 1 includes a coolant tank 11, a coolant supply pump 12, and a heat load 13. The outlet of the coolant tank 11 is connected to the inlet of the coolant supply pump 12 via a pipe. The outlet of the coolant supply pump 12 is connected to one end of the coolant passage in the coolant evaporator 24 via a pipe. The other end of the coolant passage in the coolant evaporator 24 is connected to the inlet of the heat load 13 via a pipe. The outlet of the heat load 13 is connected to the inlet of the coolant tank 11 via a pipe, thus forming a loop connection. In the coolant circulation loop 1, the coolant in the coolant tank 11 is sequentially pumped by the coolant supply pump 12 through the coolant passage in the coolant evaporator 24 and the heat load 13 before returning to the coolant tank 11, thereby forming a coolant circulation.

[0015] The coolant-refrigerant circulation loop 2 includes a compressor 21, a condenser 22, and a throttling device 23. The refrigerant outlet of the compressor 21 is connected to the inlet of the condenser 22 via a pipe. The outlet of the condenser 22 is connected to the inlet of the throttling device 23 via a pipe. The outlet of the throttling device 23 is connected to one end of the first refrigerant passage in the coolant evaporator 24 via a pipe. The other end of the first refrigerant passage in the coolant evaporator 24 is connected to the refrigerant return port of the compressor 21 via a pipe, thus forming a loop connection. In the coolant-refrigerant circulation loop 2, the high-temperature and high-pressure refrigerant output from the compressor 21 releases heat through the condenser 22, is throttled by the throttling device 23, and then enters the first refrigerant passage in the coolant evaporator 24. There, it exchanges heat with the coolant flowing through the coolant passage in the coolant evaporator 24 (from the coolant circulation loop 1) (i.e., absorbs heat from the coolant), and then returns to the compressor 21 from the first refrigerant passage in the coolant evaporator 24, thus forming a refrigerant circulation.

[0016] The air conditioning refrigerant circulation loop 3 is a separate air conditioning system for the new energy vehicle, which includes an air conditioning compressor 31, an air conditioning condenser 32, an air conditioning flow regulating device 33, and an air conditioning evaporator 34. The refrigerant outlet of the air conditioning compressor 31 is connected to the inlet of the air conditioning condenser 32 via a pipe. The outlet of the air conditioning condenser 32 is connected to the inlet of the air conditioning flow regulating device 33 via a pipe. The outlet of the air conditioning flow regulating device 33 is connected to the inlet of the air conditioning evaporator 34 via a pipe. The outlet of the air conditioning evaporator 34 is connected to one end of the second refrigerant passage in the coolant evaporator 24 via a pipe. The other end of the second refrigerant passage in the coolant evaporator 24 is connected to the refrigerant return port of the air conditioning compressor 31 via a pipe, thus forming a loop connection.

[0017] The air conditioner evaporator 34 is connected in parallel with an air conditioner evaporator valve 35. Specifically, the inlet of the air conditioner evaporator valve 35 is connected to the pipeline between the outlet of the air conditioning flow regulating device 33 and the inlet of the air conditioner evaporator 34 via a bypass pipeline, and the outlet of the air conditioner evaporator valve 35 is connected to the pipeline between the outlet of the air conditioner evaporator 34 and one end of the second refrigerant passage in the coolant evaporator 24 via a bypass pipeline.

[0018] A coolant evaporator valve 36 is connected in parallel to the second refrigerant passage of the coolant evaporator 24. Specifically, the inlet of the coolant evaporator valve 36 is connected via a bypass pipe to the outlet of the air conditioner evaporator 34 and one end of the second refrigerant passage in the coolant evaporator 24, and the outlet of the coolant evaporator valve 36 is connected via a bypass pipe to the other end of the second refrigerant passage in the coolant evaporator 24 and the refrigerant return port of the air conditioner compressor 31.

[0019] The air conditioning refrigerant circulation loop 3 serves as a backup for the coolant refrigerant circulation loop 2. When the coolant refrigerant circulation loop 2 fails, heat exchange occurs between the air conditioning refrigerant circulation loop 3 and the coolant in the coolant circulation loop 1.

[0020] In the air conditioning refrigerant circulation loop 3, when the air conditioning evaporator valve 35 and the coolant evaporator valve 36 are closed, the high-temperature and high-pressure refrigerant output by the air conditioning compressor 31 sequentially releases heat to the outside through the air conditioning condenser 32, is throttled by the air conditioning flow regulating device 33, absorbs heat from the air passing through the air conditioning evaporator 34, and then enters the second refrigerant channel in the coolant evaporator 24. There, it exchanges heat with the coolant flowing through the coolant channel in the coolant evaporator 24 (from the coolant circulation loop 1) (i.e., absorbs heat from the coolant), and then returns to the compressor 31 through the second refrigerant channel in the coolant evaporator 24, thus forming a refrigerant circulation. At this time, the refrigerant that has already absorbed heat in the air conditioning refrigerant circulation loop 3 absorbs heat from the coolant in the coolant circulation loop 1.

[0021] In the air conditioning refrigerant circulation loop 3, when the air conditioning evaporator valve 35 is closed and the coolant evaporator valve 36 is open, the high-temperature, high-pressure refrigerant output from the air conditioning compressor 31 sequentially releases heat to the outside through the air conditioning condenser 32, is throttled by the air conditioning flow regulating device 33, and absorbs heat from the air passing through the air conditioning evaporator 34. Then, without passing through the coolant evaporator 24, it returns directly to the compressor 31, thus forming a refrigerant circulation. At this time, the air conditioning refrigerant circulation only acts on the air, achieving only the function of air conditioning.

[0022] In the air conditioning refrigerant circulation loop 3, when the air conditioning evaporator valve 35 is open and the coolant evaporator valve 36 is closed, the high-temperature, high-pressure refrigerant output from the air conditioning compressor 31 sequentially releases heat through the air conditioning condenser 32, is throttled by the air conditioning flow regulating device 33, and bypasses the air conditioning evaporator 34, directly entering the second refrigerant channel in the coolant evaporator 24. There, it exchanges heat with the coolant flowing through the coolant channel in the coolant evaporator 24 (from the coolant circulation loop 1) (i.e., absorbs heat from the coolant), and then returns to the compressor 31 through the second refrigerant channel in the coolant evaporator 24, thus forming a refrigerant circulation. At this time, the air conditioning refrigerant circulation does not act on the air, but only on the coolant. This state occurs when the coolant refrigerant circulation fails and air conditioning is not required, in which case the air conditioning refrigerant circulation dissipates heat from the coolant.

[0023] In the air conditioning refrigerant circulation loop 3, when the air conditioning evaporator valve 35 and the coolant evaporator valve 36 are both open, the air conditioning refrigerant circulation loop 3 does not work; at this time, the air conditioning refrigerant circulation loop 3 has no effect. This state occurs when the coolant refrigerant circulation loop 2 is not faulty and the air conditioning is not needed.

[0024] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0025] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A coolant circulation system with backup, characterized in that, It includes an air conditioning refrigerant circulation loop (3), a coolant refrigerant circulation loop (2), and a coolant circulation loop (1), wherein refrigerant circulates in the air conditioning refrigerant circulation loop (3) and the coolant refrigerant circulation loop (2), and coolant circulates in the coolant circulation loop (1); The air conditioning refrigerant circulation loop (3), the coolant refrigerant circulation loop (2), and the coolant circulation loop (1) share the same coolant evaporator (24); the coolant evaporator (24) has one coolant channel and two refrigerant channels; the coolant channel of the coolant evaporator (24) is added to the coolant circulation loop (1) for coolant to pass through, the first refrigerant channel of the coolant evaporator (24) is added to the coolant refrigerant circulation loop (2) for the corresponding refrigerant to pass through, and the second refrigerant channel of the coolant evaporator (24) is added to the air conditioning refrigerant circulation loop (3) for the corresponding refrigerant to pass through; the refrigerants of the air conditioning refrigerant circulation loop (3) and the coolant refrigerant circulation loop (2) can exchange heat with the coolant of the coolant circulation loop (1) through the coolant evaporator (24).

2. The coolant circulation system with backup according to claim 1, characterized in that, The coolant circulation loop (1) includes a cold liquid tank (11), a liquid supply pump (12), and a heat load (13). The cold liquid tank (11) is connected in a loop through the liquid supply pump (12), the coolant channel of the coolant evaporator (24), and the heat load (13).

3. The coolant circulation system with backup according to claim 1, characterized in that, The coolant refrigerant circulation loop (2) includes a compressor (21), a condenser (22), and a throttling device (23). The first refrigerant passage of the compressor (21), condenser (22), throttling device (23), and coolant evaporator (24) forms a loop connection.

4. The coolant circulation system with backup according to claim 1, characterized in that, The air conditioning refrigerant circulation loop (3) includes an air conditioning compressor (31), an air conditioning condenser (32), an air conditioning flow regulating device (33), and an air conditioning evaporator (34). The second refrigerant channel of the air conditioning compressor (31), the air conditioning condenser (32), the air conditioning flow regulating device (33), the air conditioning evaporator (34), and the coolant evaporator (24) forms a loop connection.

5. The coolant circulation system with backup according to claim 4, characterized in that, The air conditioner evaporator (34) is connected in parallel with an air conditioner evaporator valve (35).

6. The coolant circulation system with backup according to claim 4, characterized in that, The second refrigerant passage of the coolant evaporator (24) is connected in parallel with the coolant evaporator valve (36).

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