Heat pump system and control method thereof, vehicle and computer readable storage medium

Abstract

The invention relates to a heat pump system and a control method thereof, a vehicle and a computer readable storage medium, the heat pump system comprises a refrigerant main path and a first refrigerant branch path, the first refrigerant branch path is communicated with the refrigerant main path, the first refrigerant branch path is provided with a battery cold plate, the battery cold plate is used for battery heat exchange, and the first refrigerant branch path is provided with a second refrigerant branch path. When the battery cold plate is in a non-heat-exchange state, one end of the first refrigerant branch is disconnected with the refrigerant main path so that the battery cold plate can store or release the refrigerant, the battery cold plate in the non-heat-exchange state is used as a dynamic storage device of the refrigerant, effective control over the condensation pressure is achieved, and the heat exchange efficiency of the battery cold plate is improved. The overall performance and energy efficiency of the heat pump system are improved, cost is reduced, and space is saved.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a heat pump system and a control method thereof, a vehicle, and a computer-readable storage medium. Background Art

[0002] Heat pump systems are widely used in electric vehicles and other electrical equipment to control the temperature of the cabin and / or the onboard refrigerator. In the heat pump cycle, the condensing pressure has a significant impact on the system performance and energy consumption. If the condensing pressure is too high, the compressor exhaust temperature will rise, the compression ratio will increase, the cooling capacity will decrease, and the power consumption will increase. If the condensing pressure is too low, it may cause the thermal expansion valve to work abnormally, affecting the normal operation of the refrigeration system and causing a significant decrease in cooling capacity. Therefore, adjusting the condensing pressure to keep it within a reasonable range can improve the system performance and energy efficiency level.

[0003] In the related art, there are two main ways to control the condensing pressure. One is to use a condensing pressure regulating valve to adjust the condensing pressure, and the other is to use an accumulator to adjust the condensing pressure. The former has the disadvantage that the condensing pressure regulating valve needs to be used with a pressure differential bypass valve and a liquid reservoir. The system is complex and costly, and is usually suitable for large-capacity equipment. The latter has the disadvantage that it requires the addition of a liquid reservoir and multiple pipelines, which greatly increases the complexity of the system and is costly. Summary of the invention

[0004] The embodiments of the present application provide a heat pump system and a control method thereof, a vehicle and a computer-readable storage medium, which achieve effective control of the condensing pressure, improve the overall performance and energy efficiency of the heat pump system, reduce costs, and save space, so as to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above object, according to a first aspect of the present application, a heat pump system is provided, comprising:

[0006] refrigerant main circuit; and,

[0007] A first refrigerant branch, connected to the refrigerant main circuit, wherein the first refrigerant branch is provided with a battery cold plate;

[0008] The battery cold plate is used for battery heat exchange. When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch is disconnected from the refrigerant main circuit, so that the battery cold plate stores or releases refrigerant.

[0009] Optionally, a first on-off device and a second on-off device are further provided on the first refrigerant branch, and the battery cold plate is located between the first on-off device and the second on-off device.

[0010] Optionally, the first on-off device comprises a first electronic expansion valve; and / or,

[0011] The second on-off device includes a second electronic expansion valve.

[0012] Optionally, the heat pump system further comprises a second refrigerant branch, wherein the second refrigerant branch is connected to the refrigerant main circuit to form a refrigerant circuit;

[0013] When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch is connected to the refrigerant circuit, and the other end of the first refrigerant branch is disconnected from the refrigerant circuit, so that the battery cold plate stores or releases refrigerant.

[0014] Optionally,

[0015] The second refrigerant branch includes a first refrigeration branch, and the first refrigeration branch and the refrigerant main circuit form a first refrigerant circuit; when the heat pump system is in a cooling mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is connected to the first refrigerant circuit so that the battery cold plate stores refrigerant, or the second end of the first refrigerant branch is connected to the first refrigerant circuit so that the battery cold plate releases refrigerant; and / or,

[0016] The second refrigerant branch includes a first heating branch, and the first heating branch and the refrigerant main circuit form a second refrigerant circuit; when the heat pump system is in a heating mode and the battery cold plate is in a non-heat exchange state, the second end of the first refrigerant branch is connected to the second refrigerant circuit so that the battery cold plate stores refrigerant, or the first end of the first refrigerant branch is connected to the second refrigerant circuit so that the battery cold plate releases refrigerant.

[0017] Optionally, the refrigerant main circuit includes a main circuit main section and a first main circuit branch section, the main circuit main section is provided with a compressor, and the first main circuit branch section is provided with a first condenser;

[0018] When the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchanging state, the outlet end of the main road main section is connected to the inlet end of the first main road branch section;

[0019] The first end of the first refrigerant branch is connected to the outlet end of the first main branch section, and the second end of the first refrigerant branch is disconnected from the inlet end of the main body section, so that the battery cold plate stores refrigerant; or the first end of the first refrigerant branch is disconnected from the outlet end of the first main branch section, and the second end of the first refrigerant branch is connected to the inlet end of the main body section, so that the battery cold plate releases refrigerant.

[0020] Optionally, the refrigerant main circuit further includes a second main circuit branch section, and the second main circuit branch section is provided with a first evaporator;

[0021] When the heat pump system is in a heating mode and the battery cold plate is in a non-heat exchanging state, the inlet end of the main road main section is connected to the outlet end of the second main road branch section;

[0022] The second end of the first refrigerant branch is connected to the outlet end of the main road section, and the first end of the first refrigerant branch is disconnected from the inlet end of the second main road section, so that the battery cold plate stores refrigerant; or the second end of the first refrigerant branch is disconnected from the outlet end of the main road section, and the first end of the first refrigerant branch is connected to the inlet end of the second main road section, so that the battery cold plate releases refrigerant.

[0023] Optionally, the heat pump system further comprises a first refrigerant passage and a second refrigerant passage, the first refrigerant passage is provided with a third on-off device, and the second refrigerant passage is provided with a fourth on-off device;

[0024] The first refrigerant passage is connected between the outlet end of the first main branch section and the first end of the first refrigerant branch, and the second refrigerant passage is connected between the second end of the first refrigerant branch and the inlet end of the main main section;

[0025] Among them, when the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is connected to the first refrigerant passage, and the second end of the first refrigerant branch is disconnected from the second refrigerant passage, so that the battery cold plate stores refrigerant; or, the first end of the first refrigerant branch is disconnected from the first refrigerant passage, and the second end of the first refrigerant branch is connected to the second refrigerant passage, so that the battery cold plate releases refrigerant.

[0026] Optionally, the heat pump system further includes a third refrigerant passage and a fourth refrigerant passage, the third refrigerant passage is provided with a fifth on-off device, the fourth refrigerant passage is provided with a sixth on-off device, the third refrigerant passage is connected between the outlet end of the second main branch section and the inlet end of the main body section, and the fourth refrigerant passage is connected between the first end of the first refrigerant branch and the inlet end of the second main branch section;

[0027] Among them, when the heat pump system is in heating mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is disconnected from the fourth refrigerant passage, and the third refrigerant passage is connected to the outlet end of the second main road branch section and the inlet end of the main road main section, so that the battery cold plate stores refrigerant; or, the first end of the first refrigerant branch is connected to the fourth refrigerant passage, and the third refrigerant passage is connected to the outlet end of the second main road branch section and the inlet end of the main road main section, so that the battery cold plate releases refrigerant.

[0028] Optionally,

[0029] The first main branch section is provided with a seventh on-off device; and / or,

[0030] The second main branch section is provided with an eighth on-off device; and / or,

[0031] The first refrigeration branch is provided with a ninth on-off device; and / or,

[0032] The first heating branch is provided with a tenth on-off device.

[0033] Optionally,

[0034] The first heating branch is provided with a second condenser and a first throttling device, and the first throttling device is located between the second condenser and the outlet end of the first heating branch; and / or,

[0035] The first refrigeration branch is provided with a second evaporator and a second throttling device, and the second throttling device is located between the second evaporator and the inlet end of the first refrigeration branch.

[0036] Optionally, a gas-liquid separation device is provided on the refrigerant main circuit, and the gas-liquid separation device is arranged corresponding to the inlet end of the compressor.

[0037] Optionally, the heat pump system further includes a fan, and the fan is arranged corresponding to the first condenser.

[0038] Optionally, a pressure detection device is provided on the refrigerant main circuit, and the pressure detection device is arranged corresponding to the outlet end of the compressor.

[0039] According to a second aspect of the present application, a vehicle is provided, comprising the heat pump system as described above.

[0040] According to a third aspect of the present application, a control method for a heat pump system is also provided, the heat pump system comprising a refrigerant main circuit and a first refrigerant branch circuit, the first refrigerant branch circuit being connected to the refrigerant main circuit, the first refrigerant branch circuit being provided with a battery cold plate, the control method for the heat pump system comprising:

[0041] When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch circuit is controlled to be disconnected from the refrigerant main circuit, so that the battery cold plate stores or releases refrigerant.

[0042] Optionally, when the battery cold plate is in a non-heat exchange state, the step of controlling one end of the first refrigerant branch circuit to be disconnected from the refrigerant main circuit includes:

[0043] When the actual condensing pressure of the heat pump system is greater than the target condensing pressure of the heat pump system, controlling the battery cold plate to store refrigerant;

[0044] When the actual condensing pressure of the heat pump system is less than the target condensing pressure of the heat pump system, the battery cold plate is controlled to release refrigerant.

[0045] Optionally, the heat pump system includes a compressor and a pressure detection device, the pressure detection device is arranged on the refrigerant main circuit and is arranged corresponding to the outlet end of the compressor, and the control method of the heat pump system further includes:

[0046] The pressure detection device is controlled to detect the actual condensing pressure of the heat pump system.

[0047] Optionally, the refrigerant main circuit is provided with a compressor and a first condenser, the heat pump system further includes a fan, the fan is provided corresponding to the first condenser, the heat pump system further includes an ambient temperature sensor, the ambient temperature sensor is used to detect the external ambient temperature of the heat pump system; the control method of the heat pump system further includes:

[0048] Acquire at least one operating parameter of the heat pump system, wherein the operating parameter includes a rotation speed of the compressor, an external ambient temperature of the heat pump system, and an operating gear of the fan;

[0049] A target condensing pressure of the heat pump system is determined according to the operating parameters.

[0050] Optionally, the heat pump system is communicatively connected to a battery system, and the control method of the heat pump system further includes:

[0051] Acquiring a battery temperature in the battery system;

[0052] According to the battery temperature, the flow rate of refrigerant stored in the battery cold plate is controlled.

[0053] According to a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the control method of the heat pump system as described above is implemented.

[0054] In the heat pump system of the embodiment of the present application, when the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch is disconnected from the refrigerant main circuit, so that the battery cold plate stores or releases refrigerant, effectively adjusting the amount of refrigerant in the system, thereby adjusting the condensing pressure, and improving the overall performance and energy efficiency of the heat pump system. There is no need to add additional pipelines, as well as special condensing pressure regulating devices or liquid reservoirs, which simplifies the system structure, reduces complexity and cost, and uses the existing battery cold plate as a dynamic storage device for the refrigerant. No additional physical space is required to install other equipment, which helps to optimize space. That is, by using the battery cold plate in a non-heat exchange state as a dynamic storage device for the refrigerant, effective control of the condensing pressure is achieved, the overall performance and energy efficiency of the heat pump system are improved, and costs are reduced and space is saved.

[0055] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0057] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0058] Figure 1 is a schematic structural diagram of a heat pump system provided in an exemplary embodiment of the present disclosure;

[0059] Figure 2 yes Figure 1 The working principle diagram of the battery cold plate storing refrigerant when the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchange state;

[0060] Figure 3 yes Figure 1 The working principle diagram of the battery cold plate releasing refrigerant when the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchange state;

[0061] Figure 4 yes Figure 1 The working principle diagram of the battery cold plate storing refrigerant when the heat pump system is in heating mode and the battery cold plate is in a non-heat exchange state;

[0062] Figure 5 yes Figure 1 The working principle diagram of the battery cold plate releasing refrigerant when the heat pump system is in heating mode and the battery cold plate is in a non-heat exchange state;

[0063] Figure 6 yes Figure 1 The working principle diagram of the heat pump system in cooling mode and the battery cold plate in heat exchange state;

[0064] Figure 7 yes Figure 1 The working principle diagram of the heat pump system in the heating mode and the battery cold plate in the heat exchange state;

[0065] Figure 8 is a first flow chart of a control method of a heat pump system provided in an exemplary embodiment of the present disclosure;

[0066] Fig. 9 1 is a second flow chart of a method for controlling a heat pump system provided in an exemplary embodiment of the present disclosure.

[0067] Description of reference numerals:

[0068] 100. heat pump system; 1. compressor; 2. pressure detection device; 3. seventh on-off device; 4. fan; 5. first condenser; 6. tenth on-off device; 7. second condenser; 8. first throttling device; 9. first evaporator; 10. eighth on-off device; 11. eleventh on-off device; 12. first on-off device; 13. battery cold plate; 14. second on-off device; 15. sixth on-off device; 16. third on-off device; 17. fourth on-off device; 18. fifth on-off device off device; 19, the second evaporator; 20, the second throttling device; 21, the ninth on-off device; 22, the gas-liquid separation device; 25, the refrigerant main circuit; 251, the main circuit main section; 252, the first main circuit branch section; 253, the second main circuit branch section; 26, the second refrigerant branch; 261, the first heating branch; 262, the first cooling branch; 27, the first refrigerant branch; 28, the first refrigerant passage; 29, the second refrigerant passage; 30, the third refrigerant passage; 31, the fourth refrigerant passage. DETAILED DESCRIPTION

[0069] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0070] According to a first aspect of the present application, a heat pump system is provided. Figure 1 , Figure 1 A schematic diagram of the structure of a heat pump system provided in an embodiment of the present application.

[0071] The heat pump system 100 includes a refrigerant main circuit 25 and a first refrigerant branch circuit 27. The first refrigerant branch circuit 27 is connected to the refrigerant main circuit 25. The first refrigerant branch circuit 27 is provided with a battery cold plate 13. The battery cold plate 13 is used for battery heat exchange. When the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch circuit 27 is disconnected from the refrigerant main circuit 25, so that the battery cold plate 13 can store or release refrigerant. That is, when the battery cold plate 13 is in a heat exchange state, the first refrigerant branch circuit 27 is connected to the refrigerant main circuit 25 (see Figure 6 and Figure 7 ), the refrigerant flows through the battery cold plate 13, exchanges heat with the battery, and adjusts the battery temperature. When the battery cold plate 13 is in a non-heat exchange state (see Figures 2 to 5 , that is, the battery cold plate 13 is not needed to adjust the battery temperature, and the battery cold plate 13 is in an "idle" state), one end of the first refrigerant branch 27 is disconnected from the refrigerant main path 25, and the refrigerant flows into the battery cold plate 13 or flows out of the battery cold plate 13 from the other end of the first refrigerant branch 27, which can increase or decrease the amount of refrigerant in the system, thereby indirectly adjusting the condensing pressure. Specifically, when the system needs more refrigerant, the battery cold plate 13 releases the refrigerant ( Figure 3 and Figure 5 ); On the contrary, when there is too much refrigerant in the system, the excess refrigerant is temporarily stored in the battery cold plate 13 ( Figure 2 and Figure 4 ).

[0072] In the technical solution of the present application, when the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is disconnected from the refrigerant main path 25, so that the battery cold plate 13 stores or releases refrigerant, effectively adjusting the amount of refrigerant in the system, thereby adjusting the condensing pressure, and improving the overall performance and energy efficiency of the heat pump system 100. There is no need to add additional pipelines, and a special condensing pressure regulating device or liquid reservoir, which simplifies the system structure, reduces complexity and cost, and uses the existing battery cold plate 13 as a dynamic storage device for the refrigerant. No additional physical space is required to install other equipment, which helps to optimize space. That is, by using the battery cold plate 13 in a non-heat exchange state as a dynamic storage device for the refrigerant, effective control of the condensing pressure is achieved, the overall performance and energy efficiency of the heat pump system 100 are improved, and the cost is reduced and space is saved.

[0073] In some embodiments, see Figure 1 The first refrigerant branch 27 is also provided with a first on-off device 12 and a second on-off device 14, and the battery cold plate 13 is located between the first on-off device 12 and the second on-off device 14. In these embodiments, when the battery cold plate 13 is in a heat exchange state, the first on-off device 12 and the second on-off device 14 are opened (see Figure 6 and Figure 7), the first refrigerant branch 27 is connected, the refrigerant flows through the battery cold plate 13, exchanges heat with the battery, and adjusts the battery temperature. Figures 2 to 5 When the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is disconnected from the refrigerant main path 25 by closing the first on-off device 12 and opening the second on-off device 14 (or vice versa), and the other end of the first refrigerant branch 27 is connected to the refrigerant main path 25, so that the refrigerant flows in or out, so that the battery cold plate 13 stores or releases the refrigerant. That is, by setting the first on-off device 12 and the second on-off device 14 on the first refrigerant branch 27 and placing the battery cold plate 13 between the two, the heat exchange state and the non-heat exchange state of the battery cold plate 13 can be flexibly switched, and the battery cold plate 13 can be controlled to store or release the refrigerant. For details, see Figure 2 When the heat pump system 100 is in cooling mode, the first on-off device 12 is closed and the second on-off device 14 is opened, and the refrigerant flows in from the first end (right end in the figure) of the first refrigerant branch 27, so that the battery cold plate 13 stores the refrigerant. Figure 3 When the refrigerant needs to be released, the first on-off device 12 is opened and the second on-off device 14 is closed, and the refrigerant flows out from the second end (left end in the figure) of the first refrigerant branch 27, so that the battery cold plate 13 releases the refrigerant; Figure 4 When the heat pump system 100 is in heating mode, the first on-off device 12 is turned on and the second on-off device 14 is turned off, and the refrigerant flows in from the second end of the first refrigerant branch 27, so that the battery cold plate 13 stores the refrigerant. Figure 5 When the refrigerant needs to be released, the first on-off device 12 is closed and the second on-off device 14 is opened, and the refrigerant flows out from the first end of the first refrigerant branch 27, so that the battery cold plate 13 releases the refrigerant.

[0074] In some embodiments, the first on-off device 12 includes a first electronic expansion valve, which can accurately adjust the opening as needed to ensure that the refrigerant is properly throttled and cooled before passing through the first electronic expansion valve and entering the battery cold plate 13, so as to avoid the battery cold plate 13 being affected by the high temperature of the refrigerant during the storage of the refrigerant, thereby protecting the safety of the battery. Specifically, by controlling the opening of the first electronic expansion valve to be less than or equal to a preset value, the refrigerant is throttled and cooled to a certain extent, for example, the opening degree of the first electronic expansion valve is less than or equal to 50% of the maximum opening.

[0075] In some embodiments, the second on-off device 14 includes a second electronic expansion valve, which can accurately adjust the opening as needed to ensure that the refrigerant has been properly throttled and cooled before passing through the second electronic expansion valve and entering the battery cold plate 13, so as to avoid the battery cold plate 13 being affected by the high temperature of the refrigerant during the storage of the refrigerant, thereby protecting the safety of the battery. Specifically, by controlling the opening of the second electronic expansion valve to be less than or equal to a preset value, the refrigerant is throttled and cooled to a certain extent, for example, the opening degree of the second electronic expansion valve is less than or equal to 50% of the maximum opening.

[0076] In some embodiments, see Figures 2 to 5 , the heat pump system 100 also includes a second refrigerant branch 26, which is connected to the refrigerant main circuit 25 to form a refrigerant circuit; wherein, when the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is connected to the refrigerant circuit, and the other end of the first refrigerant branch 27 is disconnected from the refrigerant circuit, so that the battery cold plate 13 stores or releases refrigerant. In these embodiments, the second refrigerant branch 26 is connected to the refrigerant main circuit 25, ensuring that the entire system forms a closed refrigerant circuit, and the second refrigerant branch 26 can be used to control the temperature of the cabin and / or the vehicle refrigerator, etc., and when one end of the first refrigerant branch 27 is connected to the refrigerant circuit and the other end is disconnected, a pressure difference is formed between the battery cold plate 13 and the refrigerant main circuit 25, and this pressure difference provides power for the refrigerant to enter or leave the battery cold plate 13, so that the refrigerant can be stored or released smoothly.

[0077] In some embodiments, see Figure 2 and Figure 3 , the second refrigerant branch 26 includes a first refrigeration branch 262, the first refrigeration branch 262 and the refrigerant main path 25 form a first refrigerant loop; when the heat pump system 100 is in the cooling mode and the battery cold plate 13 is in the non-heat exchange state, see Figure 2 The first end (right end in the figure) of the first refrigerant branch 27 is connected to the first refrigerant circuit so that the battery cold plate 13 stores refrigerant, or, specifically, see Figure 3 , the second end (left end in the figure) of the first refrigerant branch 27 is connected to the first refrigerant circuit so that the battery cold plate 13 releases the refrigerant. In these embodiments, the first refrigeration branch 262 is connected to the refrigerant main circuit 25, ensuring that the entire system forms a closed first refrigerant circuit, and the first refrigeration branch 262 can be used to cool the cabin and / or the vehicle refrigerator, etc., and when one end of the first refrigerant branch 27 is connected to the first refrigerant circuit and the other end is disconnected, a pressure difference is formed between the battery cold plate 13 and the refrigerant main circuit 25. This pressure difference provides power for the refrigerant to enter or leave the battery cold plate 13, so that the refrigerant can be stored or released smoothly, thereby ensuring that when the heat pump system 100 is in cooling mode and the battery cold plate 13 is in a non-heat exchange state, effective control of the condensation pressure is achieved.

[0078] In some embodiments, see Figure 4 and Figure 5 , the second refrigerant branch 26 includes a first heating branch 261, the first heating branch 261 and the refrigerant main path 25 form a second refrigerant loop; when the heat pump system 100 is in the heating mode and the battery cold plate 13 is in the non-heat exchange state, see Figure 4 The second end (left end in the figure) of the first refrigerant branch 27 is connected to the second refrigerant circuit so that the battery cold plate 13 stores refrigerant, or, specifically, see Figure 5 , the first end (right end in the figure) of the first refrigerant branch 27 is connected to the second refrigerant circuit, so that the battery cold plate 13 releases the refrigerant. In these embodiments, the first heating branch 261 is connected to the refrigerant main circuit 25, ensuring that the entire system forms a closed second refrigerant circuit. The first heating branch 261 can be used to heat the cabin and / or the vehicle refrigerator, etc., and when one end of the first refrigerant branch 27 is connected to the second refrigerant circuit and the other end is disconnected, a pressure difference is formed between the battery cold plate 13 and the refrigerant main circuit 25. This pressure difference provides power for the refrigerant to enter or leave the battery cold plate 13, so that the refrigerant can be stored or released smoothly, thereby ensuring that when the heat pump system 100 is in the heating mode and the battery cold plate 13 is in a non-heat exchange state, the condensation pressure is effectively controlled.

[0079] It can be understood that the second refrigerant branch 26 and the first refrigerant branch 27 share the compressor 1 and can also share the heat exchanger. The first heat exchanger is set on the refrigerant main circuit 25. When the heat pump system 100 is in cooling mode, the refrigerant passes through the first heat exchanger from the compressor 1 and then flows to the second refrigerant branch 26 and the first refrigerant branch 27 respectively, and the first heat exchanger releases heat. When the heat pump system 100 is in heating mode, the refrigerant passes through the second refrigerant branch 26 and the first refrigerant branch 27 from the compressor 1 and then flows to the first heat exchanger, and the first heat exchanger absorbs heat.

[0080] In some embodiments, see Figure 2 and Figure 3 The refrigerant main path 25 includes a main path main section 251 and a first main path branch section 252. The main path main section 251 is provided with a compressor 1, and the first main path branch section 252 is provided with a first condenser 5. When the heat pump system 100 is in the cooling mode and the battery cold plate 13 is in a non-heat exchange state, the outlet end (upper end in the figure) of the main path main section 251 is connected to the inlet end (left end in the figure) of the first main path branch section 252. Specifically, see Figure 2 , the first end (right end in the figure) of the first refrigerant branch 27 is connected to the outlet end (right end in the figure) of the first main branch section 252, and the second end (left end in the figure) of the first refrigerant branch 27 is disconnected from the inlet end (lower end in the figure) of the main main section 251, so that the battery cold plate 13 stores refrigerant; or, see specifically Figure 3, the first end of the first refrigerant branch 27 is disconnected from the outlet end of the first main branch section 252, and the second end of the first refrigerant branch 27 is connected to the inlet end of the main main section 251, so that the battery cold plate 13 releases refrigerant. In these embodiments, the first condenser 5 is specially designed for the condensation process. Compared with the general first heat exchanger, the first condenser 5 is more targeted, which can improve the condensation efficiency, optimize the performance of the system in the cooling mode, simplify the system management and enhance the system stability.

[0081] In some embodiments, see Figure 4 and Figure 5 , the refrigerant main path 25 also includes a second main path branch section 253, and the second main path branch section 253 is provided with a first evaporator 9; when the heat pump system 100 is in the heating mode and the battery cold plate 13 is in the non-heat exchange state, the inlet end of the main path main section 251 is connected to the outlet end (right end in the figure) of the second main path branch section 253; wherein, the second end of the first refrigerant branch 27 is connected to the outlet end of the main path main section 251, and the first end of the first refrigerant branch 27 is disconnected from the inlet end (left end in the figure) of the second main path branch section 253, so that the battery cold plate 13 stores refrigerant; or, the second end of the first refrigerant branch 27 is disconnected from the outlet end of the main path main section 251, and the first end of the first refrigerant branch 27 is connected to the inlet end of the second main path branch section 253, so that the battery cold plate 13 releases refrigerant. In these embodiments, the first evaporator 9 is specially designed for the evaporation process. Compared with the general first heat exchanger, the first evaporator 9 is more targeted and can improve the evaporation efficiency, optimize the performance of the system in the heating mode, simplify the system management and enhance the system stability.

[0082] It can be understood that in order to achieve the switching of the cooling mode and the heating mode of the heat pump system 100, a four-way reversing valve can be installed in the heat pump system 100. The four-way reversing valve is a common component used for mode switching of the heat pump system 100. It can change the flow direction of the refrigerant, thereby achieving the switching of the cooling mode and the heating mode. This application will not go into details.

[0083] In some embodiments, see Figure 2 and Figure 3 , the heat pump system 100 further includes a first refrigerant passage 28 and a second refrigerant passage 29, the first refrigerant passage 28 is provided with a third on-off device 16, and the second refrigerant passage 29 is provided with a fourth on-off device 17; wherein, when the heat pump system 100 is in cooling mode and the battery cold plate 13 is in a non-heat exchange state, the first refrigerant passage 28 is connected between the outlet end (right end in the figure) of the first main branch section 252 and the first end (right end in the figure) of the first refrigerant branch 27, wherein, specifically, see Figure 2, the first end of the first refrigerant branch 27 is connected to the first refrigerant passage 28, and the second end of the first refrigerant branch 27 is disconnected from the second refrigerant passage 29, so that the battery cold plate 13 stores refrigerant; or, see Figure 3 , the first end of the first refrigerant branch 27 is disconnected from the first refrigerant passage 28, and the second end of the first refrigerant branch 27 is connected to the second refrigerant passage 29, so that the battery cold plate 13 releases the refrigerant. In these embodiments, by introducing the first refrigerant passage 28 and the second refrigerant passage 29, and the corresponding third on-off device 16 and fourth on-off device 17, the system can more flexibly control the flow direction of the refrigerant, can smoothly switch to the cooling mode and the battery cold plate 13 is in a non-heat exchange state (see Figure 2). Figures 2 to 7 The refrigerant flow path is bolded, the arrow indicates the refrigerant flow direction, the on-off devices in the refrigerant flow path are turned on, and the other on-off devices are turned off, which will not be described in detail later). Since these on-off devices directly control the on-off to achieve flow direction switching, the response speed is fast, maintenance is simple, and flexibility is high, thereby improving the dynamic performance of the system during mode switching, and improving the reliability and efficiency of the system. Specifically, the third on-off device 16 can be a solenoid valve, and the fourth on-off device 17 can also be a solenoid valve, which can achieve fast and accurate switch control.

[0084] In some embodiments, see Figure 4 and Figure 5 , the heat pump system 100 also includes a third refrigerant passage 30 and a fourth refrigerant passage 31, the third refrigerant passage 30 is provided with a fifth on-off device 18, the fourth refrigerant passage 31 is provided with a sixth on-off device 15, the third refrigerant passage 30 is connected between the outlet end of the second main road branch section 253 and the inlet end of the main road main section 251, and the fourth refrigerant passage 31 is connected between the first end of the first refrigerant branch 27 and the inlet end of the second main road branch section 253; wherein, when the heat pump system 100 is in the heating mode and the battery cold plate 13 is in the non-heat exchange state, see specifically Figure 4 , the first end of the first refrigerant branch 27 is disconnected from the fourth refrigerant passage 31, and the third refrigerant passage 30 is connected to the outlet end of the second main road branch section 253 and the inlet end of the main road main section 251, so that the battery cold plate 13 stores refrigerant; or, see specifically Figure 5, the first end of the first refrigerant branch 27 is connected to the fourth refrigerant passage 31, and the third refrigerant passage 30 is connected to the outlet end of the second main branch section 253 and the inlet end of the main main section 251, so that the battery cold plate 13 releases the refrigerant. In these embodiments, by introducing the third refrigerant passage 30 and the fourth refrigerant passage 31, and the corresponding fifth on-off device 18 and the sixth on-off device 15, the system can more flexibly control the flow direction of the refrigerant, can smoothly switch to the heating mode and the battery cold plate 13 is in a non-heat exchange state. Since these on-off devices directly control the on-off to achieve flow direction switching, the response speed is fast, maintenance is simple, and flexibility is high, thereby improving the dynamic performance of the system during mode switching, and improving the reliability and efficiency of the system. Specifically, the fifth on-off device 18 can be a solenoid valve, and the sixth on-off device 15 can also be a solenoid valve, which can achieve fast and accurate switch control.

[0085] In some embodiments, the first main branch section 252 is provided with a seventh on-off device 3. In these embodiments, the seventh on-off device 3 controls the flow of refrigerant in the first main branch section 252. Figure 2 , Figure 3 and Figure 6 In the cooling mode, the seventh on-off device 3 is turned on to ensure that the refrigerant can flow smoothly through the first main branch section 252. Figure 4 , Figure 5 and Figure 7 In the heating mode, the seventh on-off device 3 is disconnected to cut off the refrigerant of the first main branch section 252. The system can more accurately control the flow direction and pressure of the refrigerant in the cooling and heating modes, ensuring that the system can operate efficiently under different working conditions. In addition, the existence of the seventh on-off device 3 also enhances the flexibility and reliability of the system, and facilitates maintenance and troubleshooting. Specifically, the seventh on-off device 3 is a solenoid valve that can achieve fast and accurate switch control.

[0086] In some embodiments, the second main branch section 253 is provided with an eighth on-off device 10. In these embodiments, the eighth on-off device 10 controls the flow of refrigerant in the second main branch section 253. Figure 4 , Figure 5 and Figure 7 In the heating mode, the eighth on-off device 10 is turned on to ensure that the refrigerant can flow smoothly through the second main branch section 253. Figure 2 , Figure 3 and Figure 6In the cooling mode, the eighth on-off device 10 is disconnected to cut off the refrigerant of the second main branch section 253. The system can more accurately control the flow direction and pressure of the refrigerant in the cooling and heating modes, ensuring that the system can operate efficiently under different working conditions. In addition, the existence of the eighth on-off device 10 also enhances the flexibility and reliability of the system, and facilitates maintenance and troubleshooting. Specifically, the eighth on-off device 10 is a solenoid valve that can achieve fast and accurate switch control.

[0087] In some embodiments, the first refrigeration branch 262 is provided with a ninth on-off device 21. In these embodiments, the ninth on-off device 21 controls the flow of refrigerant in the first refrigeration branch 262. Figure 2 , Figure 3 and Figure 6 In the cooling mode, the ninth on-off device 21 is turned on to ensure that the refrigerant can flow smoothly through the first cooling branch 262. Figure 4 , Figure 5 and Figure 7 In the heating mode, the ninth on-off device 21 is disconnected to cut off the refrigerant in the first refrigeration branch 262. The system can more accurately control the flow direction and pressure of the refrigerant in the cooling and heating modes, ensuring that the system can operate efficiently under different working conditions. In addition, the existence of the ninth on-off device 21 also enhances the flexibility and reliability of the system, facilitating maintenance and troubleshooting. Specifically, the ninth on-off device 21 is a solenoid valve that can achieve fast and accurate on-off control.

[0088] In some embodiments, the first heating branch 261 is provided with a tenth on-off device 6. In these embodiments, the tenth on-off device 6 controls the flow of the refrigerant in the first heating branch 261. Figure 4 , Figure 5 and Figure 7 In the heating mode, the tenth on-off device 6 is turned on to ensure that the refrigerant can flow smoothly through the first heating branch 261. Figure 2 , Figure 3 and Figure 6 In the cooling mode, the tenth on-off device 6 is disconnected, and the first heating branch 261 is cut off. The system can more accurately control the flow direction and pressure of the refrigerant in the cooling and heating modes, ensuring that the system can operate efficiently under different working conditions. In addition, the existence of the tenth on-off device 6 also enhances the flexibility and reliability of the system, and facilitates maintenance and troubleshooting. Specifically, the tenth on-off device 6 is a solenoid valve, which can achieve fast and accurate on-off control.

[0089] In some embodiments, see Figure 1, an eleventh on-off device 11 is also provided on the first refrigerant branch 27. It can be understood that when the first on-off device 12 and / or the second on-off device 14 is an electronic expansion valve, the electronic expansion valve can achieve precise flow control, and also has a full-open function and a two-way shut-off function. Even if the eleventh on-off device 11 is not provided, the refrigerant flow in the first refrigerant branch 27 can be cut off by the first on-off device 12 and the second on-off device 14. In these embodiments, the eleventh on-off device 11 is provided, and when necessary, the refrigerant flow of the first refrigerant branch 27 can be directly cut off by the eleventh on-off device 11 (for example, when the system is maintained or overhauled, the first refrigerant branch 27 is cut off to facilitate local maintenance or replacement of components), providing additional control flexibility, redundancy and multiple protections.

[0090] In some embodiments, see Figure 4 , Figure 5 and Figure 7 , the first heating branch 261 is provided with a second condenser 7 and a first throttling device 8, the first throttling device 8 is located between the second condenser 7 and the outlet end of the first heating branch 261 (the left end in the figure), in these embodiments, on the first heating branch 261, the refrigerant flows out through the first throttling device 8 after the second condenser 7, and then enters the first evaporator 9, the first throttling device 8 reduces the pressure and temperature of the refrigerant, so that it can effectively absorb heat when entering the first evaporator 9, thereby improving the heat exchange efficiency and stability of the system. Specifically, the first throttling device 8 is an electronic expansion valve to achieve precise flow control.

[0091] In some embodiments, see Figure 2 , Figure 3 and Figure 6 , the first refrigeration branch 262 is provided with a second evaporator 19 and a second throttling device 20, the second throttling device 20 is located between the second evaporator 19 and the inlet end (right end in the figure) of the first refrigeration branch 262, in these embodiments, on the first refrigeration branch 262, the refrigerant passes through the second throttling device 20 and enters the second evaporator 19, the second throttling device 20 reduces the pressure and temperature of the refrigerant, so that it can effectively absorb heat when entering the second evaporator 19, thereby improving the heat exchange efficiency and stability of the system. Specifically, the second throttling device 20 is an electronic expansion valve to achieve precise flow control.

[0092] In some embodiments, see Figure 1A gas-liquid separation device 22 is provided on the refrigerant main path 25, and the gas-liquid separation device 22 is arranged corresponding to the inlet end of the compressor 1. In these embodiments, it is ensured that only the gaseous component in the refrigerant in the refrigerant main path 25 enters the compressor 1, and the "liquid hammer" phenomenon caused by the liquid refrigerant directly entering the compressor 1 is prevented, thereby protecting the compressor 1 from damage. By ensuring that the refrigerant at the inlet end of the compressor 1 is gaseous, the efficiency of the compression process can be improved, the ineffective compression of the liquid refrigerant during the compression process can be avoided, the energy consumption can be reduced, and the overall energy efficiency of the refrigeration system can be improved.

[0093] In some embodiments, see Figure 1 The heat pump system 100 also includes a fan 4, and the fan 4 is arranged corresponding to the first condenser 5. In these embodiments, the fan 4 is arranged corresponding to the first condenser 5, which means that the fan 4 is located near the first condenser 5, and can force air flow, accelerate the air flow around the first condenser 5, thereby significantly improving the heat dissipation efficiency of the first condenser 5, thereby improving the overall performance and energy efficiency ratio of the system.

[0094] It is understandable that in addition to direct detection, there are other ways to indirectly infer or measure the refrigerant pressure. For example, since the pressure of the refrigerant has a certain relationship with its temperature, the corresponding pressure can be calculated by measuring the temperature of the refrigerant and using thermodynamic diagrams or formulas. For example, the refrigerant pressure can be inferred by measuring the flow change of the refrigerant and combining it with the thermodynamic characteristics of the system.

[0095] In some embodiments, see Figure 1 The heat pump system 100 includes a pressure detection device 2, which is arranged on the refrigerant main path 25 and corresponds to the outlet end of the compressor 1. In these embodiments, the refrigerant pressure is directly detected by the pressure detection device 2, which provides the most direct and accurate data of the refrigerant pressure, and is conducive to improving the real-time and accuracy of the refrigerant pressure detection. The pressure at the outlet end of the compressor 1 directly reflects the working state of the compressor 1 and the pressure level of the system. If it is set at other positions (such as the end of the evaporator or condenser), due to the delay effect of the refrigerant transmission, it may not be able to reflect the latest pressure changes in real time. In this way, the pressure detection device 2 is set at the outlet end of the compressor 1, which can monitor the refrigerant pressure in real time and accurately, so as to make appropriate adjustment strategies for the refrigerant pressure to ensure stable operation of the system and optimize the overall performance.

[0096] Understandable, see Figure 6When the heat pump system 100 is in cooling mode and the battery cold plate 13 is in heat exchange state, the main road main section 251 is connected with the first main road branch section 252, and the first main road branch section 252 is respectively connected with the first refrigerant branch 27 and the first refrigeration branch 262; in these embodiments, after the refrigerant flows out of the compressor 1, it first flows through the first condenser 5, and then flows into the battery cold plate 13 and the second evaporator 19 respectively, and finally flows back to the compressor 1, which can better exert the best performance of the first condenser 5. The heat pump system 100 can operate more efficiently in the cooling mode, which not only improves the overall performance and energy efficiency of the system, but also simplifies the management and maintenance of the system.

[0097] It is understandable, see Figure 7 When the heat pump system 100 is in the heating mode and the battery cold plate 13 is in the heat exchange state, the main road main section 251 is connected with the second main road branch section 253, and the second main road branch section 253 is respectively connected with the first refrigerant branch 27 and the first heating branch 261. In these embodiments, after the refrigerant flows out of the compressor 1, it first flows into the battery cold plate 13 and the second condenser 7 respectively, and then flows into the first evaporator 9, and finally flows back to the compressor 1, which can better exert the best performance of the first evaporator 9. The heat pump system 100 can operate more efficiently in the heating mode, which not only improves the overall performance and energy efficiency of the system, but also simplifies the management and maintenance of the system.

[0098] It can also be understood that the battery cold plate 13 has a certain storage capacity. When the battery cold plate 13 is in the heat exchange state, the battery cold plate 13 is not full of refrigerant. When the battery cold plate 13 switches from the heat exchange state to the non-heat exchange state, the battery cold plate 13 still has surplus space for storing refrigerant. When the battery cold plate 13 switches from the non-heat exchange state to the heat exchange state, in order to avoid the influence of the change in the amount of refrigerant caused by the storage or release of refrigerant on the heat exchange function of the battery cold plate 13, when the battery cold plate 13 switches from the non-heat exchange state to the heat exchange state, the speed of the compressor 1 is reduced to the minimum speed (for example, 900 rpm) to balance the system pressure, that is, at the minimum speed of the compressor 1, the heat pump system 100 is close to the "shutdown" state. After the first refrigerant branch 27 is connected, the refrigerant will flow again to reach a new balance and reach the initial distribution close to the "shutdown", and then the battery cold plate 13 is cooled / heated, so that the heat exchange function of the battery cold plate 13 itself will not be affected.

[0099] According to the second aspect of the present application, a vehicle is provided, including a heat pump system 100, the structure of the heat pump system 100 is as described above, and since the present vehicle adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The vehicle can be a plug-in hybrid vehicle or a new energy vehicle, etc., and the present application does not make specific limitations on this.

[0100] According to the third aspect of the present application, a control method for a heat pump system 100 is also provided. The specific structure of the heat pump system 100 can refer to the above-mentioned heat pump system 100, and the embodiments of the present application are not described in detail here. The heat pump system 100 includes a refrigerant main circuit 25 and a first refrigerant branch circuit 27. The first refrigerant branch circuit 27 is connected to the refrigerant main circuit 25. The first refrigerant branch circuit 27 is provided with a battery cold plate 13, wherein the battery cold plate 13 is used for battery heat exchange. When the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch circuit 27 is disconnected from the refrigerant main circuit 25, so that the battery cold plate 13 stores or releases the refrigerant, that is, the battery cold plate 13 acts as a temporary storage device for the refrigerant, thereby adjusting the amount of refrigerant in the system, and then indirectly adjusting the condensing pressure, thereby achieving effective control of the condensing pressure and improving the overall performance and energy efficiency of the heat pump system 100.

[0101] The following is a detailed description of the control method of the heat pump system 100. It should be noted that the order of the following embodiments is not intended to limit the preferred order of the embodiments. Figure 8 and Fig. 9 This is a flow chart of a control method of a heat pump system 100 provided in an embodiment of the present application. Figure 8 The specific process of the control method of the heat pump system 100 provided in the embodiment of the present application can be as follows:

[0102] S102 : When the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25 , so that the battery cold plate 13 stores or releases refrigerant.

[0103] In these embodiments, the control method of the heat pump system 100 includes the following steps: when the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25, so that the battery cold plate 13 stores or releases refrigerant, that is, S101: obtaining the working state of the battery cold plate 13; S103: when the battery cold plate 13 is in a heat exchange state, the first refrigerant branch 27 is controlled to be connected, and the refrigerant flows through the battery cold plate 13, exchanges heat with the battery, and adjusts the battery temperature, S102: when the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25, and the battery cold plate 13 can be used to store or release refrigerant. In this state, the battery cold plate 13 acts as a temporary storage device for the refrigerant, thereby adjusting the amount of refrigerant in the system, and then indirectly adjusting the condensing pressure, thereby achieving effective control of the condensing pressure and improving the overall performance and energy efficiency of the heat pump system 100.

[0104] Specifically, in cooling mode, see Figure 2When the battery cold plate 13 is in a non-heat exchange state, the second end (left end in the figure) of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25, and the refrigerant flows in from the first end (right end in the figure), so that the battery cold plate 13 stores the refrigerant. Figure 3 , control the first end (right end in the figure) of the first refrigerant branch 27 to be disconnected from the refrigerant main path 25, and the refrigerant flows out from the second end (left end in the figure), so that the battery cold plate 13 releases the refrigerant. In the heating mode, see Figure 4 When the battery cold plate 13 is in a non-heat exchange state, the first end (right end in the figure) of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25, and the refrigerant flows in from the second end (left end in the figure), so that the battery cold plate 13 stores the refrigerant. Figure 5 , the second end (the left end in the figure) of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25, and the refrigerant flows out from the first end (the right end in the figure), so that the battery cold plate 13 releases the refrigerant.

[0105] In some embodiments, see Fig. 9 When the battery cold plate 13 is in a non-heat exchange state, the step S102 of controlling one end of the first refrigerant branch 27 to be disconnected from the refrigerant main path 25 includes:

[0106] S1021: When the actual condensing pressure of the heat pump system 100 is greater than the target condensing pressure of the heat pump system 100, controlling the battery cold plate 13 to store refrigerant;

[0107] S1022: When the actual condensing pressure of the heat pump system 100 is less than the target condensing pressure of the heat pump system 100, the battery cold plate 13 is controlled to release the refrigerant.

[0108] In these embodiments, the actual condensing pressure is compared with the preset target condensing pressure. If the actual condensing pressure is greater than the target condensing pressure, it indicates that the refrigerant pressure in the system is too high and the condensing pressure needs to be lowered. By controlling one end of the first refrigerant branch 27 to be disconnected from the refrigerant main line 25, the refrigerant can flow into the battery cold plate 13 for storage, thereby reducing the condensing pressure in the system. If the actual condensing pressure is lower than the target condensing pressure, it indicates that the refrigerant pressure in the system is too low and the condensing pressure needs to be increased. By controlling one end of the first refrigerant branch 27 to be disconnected from the refrigerant main line 25, the refrigerant can be released from the battery cold plate 13, thereby increasing the condensing pressure in the system. That is, the storage or release of the refrigerant can be dynamically controlled according to the comparison result between the actual condensing pressure and the target condensing pressure to ensure that the system operates in the best state.

[0109] In some embodiments, the heat pump system 100 includes a pressure detection device 2, which is disposed on the refrigerant main path 25 and is disposed corresponding to the outlet end of the compressor 1. Fig. 9 , the control method of the heat pump system 100 further includes:

[0110] S104: Control the pressure detection device 2 to detect the actual condensing pressure of the heat pump system 100.

[0111] In these embodiments, the pressure at the outlet of the compressor 1 directly reflects the working state of the compressor 1 and the pressure level of the system. The refrigerant pressure is directly detected by the pressure detection device 2, which provides the most direct and accurate data of the refrigerant pressure, and is conducive to improving the real-time and accuracy of the refrigerant pressure detection. The pressure detection device 2 is controlled to detect the actual condensing pressure of the heat pump system 100, so as to make appropriate adjustment strategies for the refrigerant pressure to ensure stable operation of the system and optimize the overall performance.

[0112] In some embodiments, the refrigerant main circuit 25 is further provided with a first condenser 5, the heat pump system 100 further includes a fan 4, the fan 4 is provided corresponding to the first condenser 5, and the heat pump system 100 further includes an ambient temperature sensor, which is used to detect the external ambient temperature of the heat pump system 100, see Fig. 9 , the control method of the heat pump system 100 further includes:

[0113] S105: Acquire at least one operating parameter of the heat pump system 100, where the operating parameter includes the rotation speed of the compressor 1, the external environment temperature of the heat pump system 100, and the operating gear of the fan 4;

[0114] S106: Determine the target condensing pressure of the heat pump system 100 according to the operating parameters.

[0115] In these embodiments, the operating parameters include the speed of the compressor 1, the external ambient temperature of the heat pump system 100, and the operating position of the fan 4. According to the operating parameters, the target condensing pressure of the heat pump system 100 is determined. It can be understood that the higher the speed of the compressor 1, the higher the condensing pressure generated by the system. Therefore, the target condensing pressure needs to be adjusted according to the speed of the compressor 1. The higher the ambient temperature, the lower the heat dissipation efficiency of the condenser. The target condensing pressure needs to be increased to ensure the normal operation of the system. The higher the operating position of the fan 4, the better the heat dissipation effect of the condenser. The target condensing pressure can be appropriately reduced; otherwise, the target condensing pressure needs to be increased. The target condensing pressure is dynamically adjusted according to parameters such as the speed of the compressor 1, the ambient temperature, and the gear of the fan 4, which can achieve the optimized operation of the system and improve the overall energy efficiency. The target condensing pressure can be adjusted in real time according to the changes in different environments and working conditions, and the adaptability and flexibility of the system are enhanced. Specifically, the current speed of the compressor 1 is obtained by a sensor or other means, the current ambient temperature is obtained by a temperature sensor installed outside the heat pump system 100, and the current operating gear of the fan 4 (for example, low speed gear, medium speed gear or high speed gear) is obtained by detection or setting.

[0116] In some embodiments, the heat pump system 100 is in communication with the battery system, and the control method of the heat pump system 100 further includes:

[0117] S107: Acquire battery temperature in the battery system;

[0118] S108: Controlling the flow rate of the refrigerant stored in the battery cold plate 13 according to the battery temperature.

[0119] In these embodiments, the control method of the heat pump system 100 also includes: obtaining the battery temperature in the battery system, and controlling the refrigerant flow rate stored in the battery cold plate 13 according to the battery temperature, that is, even if the battery is in a non-heat exchange state, the battery temperature is monitored, and by controlling the refrigerant flow rate stored in the battery cold plate 13, a large amount of high-temperature refrigerant is prevented from quickly entering the battery cold plate 13, causing the temperature of the battery cold plate 13 to rise rapidly and affect the battery state. Specifically, an electronic expansion valve is set in the first refrigerant branch 27, and the opening of the electronic expansion valve is controlled, so that the high-temperature refrigerant slowly flows into the battery cold plate 13 through the electronic expansion valve and mixes with the original low-temperature refrigerant of the battery cold plate 13, so as to avoid the battery cold plate 13 being too high and affecting the battery state.

[0120] According to a fourth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the control method of the heat pump system 100 according to any of the above embodiments is implemented.

[0121] For example, when the program is executed by the processor, the following control method of the heat pump system 100 is implemented:

[0122] S102 : When the battery cold plate 13 is in a non-heat exchange state, one end of the first refrigerant branch 27 is controlled to be disconnected from the refrigerant main path 25 , so that the battery cold plate 13 stores or releases refrigerant.

[0123] For another example, when the program is executed by the processor, the following control method of the heat pump system 100 is implemented:

[0124] S1021: When the actual condensing pressure of the heat pump system 100 is greater than the target condensing pressure of the heat pump system 100, controlling the battery cold plate 13 to store refrigerant;

[0125] S1022: When the actual condensing pressure of the heat pump system 100 is less than the target condensing pressure of the heat pump system 100, the battery cold plate 13 is controlled to release the refrigerant.

[0126] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0127] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0128] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0129] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A heat pump system, characterized in that: The heat pump system comprises: refrigerant main circuit; and, A first refrigerant branch, connected to the refrigerant main circuit, wherein the first refrigerant branch is provided with a battery cold plate; The battery cold plate is used for battery heat exchange. When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch is disconnected from the refrigerant main circuit, so that the battery cold plate stores or releases refrigerant.

2. The heat pump system according to claim 1, characterized in that: The first refrigerant branch is also provided with a first on-off device and a second on-off device, and the battery cold plate is located between the first on-off device and the second on-off device.

3. The heat pump system according to claim 2, characterized in that: The first on-off device comprises a first electronic expansion valve; and / or, The second on-off device includes a second electronic expansion valve.

4. The heat pump system according to any one of claims 1 to 3, characterized in that: The heat pump system further includes a second refrigerant branch, which is connected to the refrigerant main circuit to form a refrigerant circuit; When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch is connected to the refrigerant circuit, and the other end of the first refrigerant branch is disconnected from the refrigerant circuit, so that the battery cold plate stores or releases refrigerant.

5. The heat pump system according to claim 4, characterized in that: The second refrigerant branch includes a first refrigeration branch, and the first refrigeration branch and the refrigerant main circuit form a first refrigerant loop; when the heat pump system is in a cooling mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is connected to the first refrigerant loop so that the battery cold plate stores refrigerant, or the second end of the first refrigerant branch is connected to the first refrigerant loop so that the battery cold plate releases refrigerant; and / or, The second refrigerant branch includes a first heating branch, and the first heating branch and the refrigerant main circuit form a second refrigerant circuit; when the heat pump system is in a heating mode and the battery cold plate is in a non-heat exchange state, the second end of the first refrigerant branch is connected to the second refrigerant circuit so that the battery cold plate stores refrigerant, or the first end of the first refrigerant branch is connected to the second refrigerant circuit so that the battery cold plate releases refrigerant.

6. The heat pump system according to claim 5, characterized in that: The refrigerant main path includes a main path main section and a first main path branch section, the main path main section is provided with a compressor, and the first main path branch section is provided with a first condenser; When the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchanging state, the outlet end of the main road main section is connected to the inlet end of the first main road branch section; The first end of the first refrigerant branch is connected to the outlet end of the first main branch section, and the second end of the first refrigerant branch is disconnected from the inlet end of the main body section, so that the battery cold plate stores refrigerant; or the first end of the first refrigerant branch is disconnected from the outlet end of the first main branch section, and the second end of the first refrigerant branch is connected to the inlet end of the main body section, so that the battery cold plate releases refrigerant.

7. The heat pump system according to claim 6, characterized in that: The refrigerant main path also includes a second main path branch section, and the second main path branch section is provided with a first evaporator; When the heat pump system is in a heating mode and the battery cold plate is in a non-heat exchanging state, the inlet end of the main road main section is connected to the outlet end of the second main road branch section; The second end of the first refrigerant branch is connected to the outlet end of the main road section, and the first end of the first refrigerant branch is disconnected from the inlet end of the second main road section, so that the battery cold plate stores refrigerant; or the second end of the first refrigerant branch is disconnected from the outlet end of the main road section, and the first end of the first refrigerant branch is connected to the inlet end of the second main road section, so that the battery cold plate releases refrigerant.

8. The heat pump system according to claim 7, characterized in that: The heat pump system further comprises a first refrigerant passage and a second refrigerant passage, the first refrigerant passage is provided with a third on-off device, and the second refrigerant passage is provided with a fourth on-off device; The first refrigerant passage is connected between the outlet end of the first main branch section and the first end of the first refrigerant branch, and the second refrigerant passage is connected between the second end of the first refrigerant branch and the inlet end of the main main section; Among them, when the heat pump system is in cooling mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is connected to the first refrigerant passage, and the second end of the first refrigerant branch is disconnected from the second refrigerant passage, so that the battery cold plate stores refrigerant; or, the first end of the first refrigerant branch is disconnected from the first refrigerant passage, and the second end of the first refrigerant branch is connected to the second refrigerant passage, so that the battery cold plate releases refrigerant.

9. The heat pump system according to claim 8, characterized in that: The heat pump system further comprises a third refrigerant passage and a fourth refrigerant passage, the third refrigerant passage is provided with a fifth on-off device, the fourth refrigerant passage is provided with a sixth on-off device, the third refrigerant passage is connected between the outlet end of the second main branch section and the inlet end of the main main section, and the fourth refrigerant passage is connected between the first end of the first refrigerant branch and the inlet end of the second main branch section; Among them, when the heat pump system is in heating mode and the battery cold plate is in a non-heat exchange state, the first end of the first refrigerant branch is disconnected from the fourth refrigerant passage, and the third refrigerant passage is connected to the outlet end of the second main road branch section and the inlet end of the main road main section, so that the battery cold plate stores refrigerant; or, the first end of the first refrigerant branch is connected to the fourth refrigerant passage, and the third refrigerant passage is connected to the outlet end of the second main road branch section and the inlet end of the main road main section, so that the battery cold plate releases refrigerant.

10. The heat pump system according to claim 7, characterized in that: The first main branch section is provided with a seventh on-off device; and / or, The second main branch section is provided with an eighth on-off device; and / or, The first refrigeration branch is provided with a ninth on-off device; and / or, The first heating branch is provided with a tenth on-off device.

11. The heat pump system according to claim 5, characterized in that: The first heating branch is provided with a second condenser and a first throttling device, and the first throttling device is located between the second condenser and the outlet end of the first heating branch; and / or, The first refrigeration branch is provided with a second evaporator and a second throttling device, and the second throttling device is located between the second evaporator and the inlet end of the first refrigeration branch.

12. The heat pump system according to claim 6, characterized in that: A gas-liquid separation device is provided on the refrigerant main circuit, and the gas-liquid separation device is arranged corresponding to the inlet end of the compressor.

13. The heat pump system according to claim 6, characterized in that: The heat pump system further includes a fan, and the fan is arranged corresponding to the first condenser.

14. The heat pump system according to claim 6, characterized in that: A pressure detection device is provided on the refrigerant main circuit, and the pressure detection device is arranged corresponding to the outlet end of the compressor.

15. A vehicle, characterized in that: A heat pump system comprising the heat pump system according to any one of claims 1 to 14.

16. A control method for a heat pump system, characterized in that: The heat pump system includes a refrigerant main circuit and a first refrigerant branch circuit, the first refrigerant branch circuit is connected to the refrigerant main circuit, the first refrigerant branch circuit is provided with a battery cold plate, and the control method of the heat pump system includes: When the battery cold plate is in a non-heat exchange state, one end of the first refrigerant branch circuit is controlled to be disconnected from the refrigerant main circuit, so that the battery cold plate stores or releases refrigerant.

17. The control method of the heat pump system according to claim 16, characterized in that: When the battery cold plate is in a non-heat exchange state, the step of controlling one end of the first refrigerant branch to be disconnected from the refrigerant main circuit includes: When the actual condensing pressure of the heat pump system is greater than the target condensing pressure of the heat pump system, controlling the battery cold plate to store refrigerant; When the actual condensing pressure of the heat pump system is less than the target condensing pressure of the heat pump system, the battery cold plate is controlled to release refrigerant.

18. The control method of the heat pump system according to claim 17, characterized in that: The heat pump system includes a compressor and a pressure detection device, wherein the pressure detection device is disposed on the refrigerant main circuit and is disposed corresponding to the outlet end of the compressor. The control method of the heat pump system also includes: The pressure detection device is controlled to detect the actual condensing pressure of the heat pump system.

19. The control method of the heat pump system according to claim 17, characterized in that: The refrigerant main circuit is provided with a compressor and a first condenser, the heat pump system further includes a fan, the fan is provided corresponding to the first condenser, the heat pump system further includes an ambient temperature sensor, the ambient temperature sensor is used to detect the external ambient temperature of the heat pump system; The control method of the heat pump system further includes: Acquire at least one operating parameter of the heat pump system, wherein the operating parameter includes a rotation speed of the compressor, an external ambient temperature of the heat pump system, and an operating gear of the fan; A target condensing pressure of the heat pump system is determined according to the operating parameters.

20. The control method of the heat pump system according to claim 16, characterized in that: The heat pump system is communicatively connected to the battery system, and the control method of the heat pump system further includes: Acquiring a battery temperature in the battery system; According to the battery temperature, the flow rate of refrigerant stored in the battery cold plate is controlled.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the heat pump system according to any one of claims 16 to 20 is implemented.

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