Battery thermal management system based on separated heat pipe, battery thermal management method and vehicle

Abstract

The invention provides a battery heat management system based on a separated heat pipe, a battery heat management method and a vehicle, the battery heat management system comprises a battery heat exchange system, the battery heat exchange system comprises the separated heat pipe, and the battery heat exchange system is communicated with a PTC heating system and an air conditioning system through the separated heat pipe and performs heat exchange with the PTC heating system and the air conditioning system; the air conditioning system and the battery heat exchange system each comprise an electromagnetic valve, and the closed state combination of the electromagnetic valves is used for controlling a heat management mode. The heat management mode comprises a battery passenger compartment refrigeration mode, a battery heating mode and a battery passenger compartment heating mode, and in the battery passenger compartment refrigeration mode, a water pump in the PTC heating system does not work. According to the application, the control of the battery passenger compartment refrigeration mode, the battery heating mode and the battery passenger compartment heating mode can be realized based on the combination of the closed states of the electromagnetic valves, so that the thermal management requirements in different scenes are met. And on the other hand, the energy consumption in the heat management process can be reduced through the separated heat pipe and reduction of the working time of the water pump in the PTC heating system.

Description

Technical Field

[0001] The present application relates to the field of vehicle thermal management, and in particular, to a battery thermal management system based on a separate heat pipe, a battery thermal management method and a vehicle. Background Art

[0002] At present, power batteries in new energy vehicles mainly use air cooling or liquid cooling to dissipate heat. Air cooling is to force air to pass through the battery surface and remove the battery heat by forced convection. The system is simple and low in cost, but the heat dissipation efficiency is low. Liquid cooling is to drive the coolant of the water cooling plate in the liquid cooling system through a water pump to exchange heat between the battery and the wall, which has high heat exchange efficiency.

[0003] Air has the characteristics of small heat capacity and convection heat transfer coefficient, so the air cooling efficiency is low; the liquid cooling system has a higher heat transfer efficiency, but a water pump is usually required in the battery cooling system to drive the liquid medium to heat or cool the battery, which consumes a lot of energy. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a battery thermal management system based on a separate heat pipe, a battery thermal management method and a vehicle, which are used to realize the control of the battery passenger compartment cooling mode, the battery heating mode and the battery passenger compartment heating mode based on the closed state combination of the solenoid valve to meet the thermal management requirements in different scenarios. On the other hand, the present application can reduce the energy consumption of the thermal management process by separating the heat pipe and reducing the working time of the water pump in the PTC heating system.

[0005] In a first aspect, the present invention provides a battery thermal management system based on a separate heat pipe, the system comprising: an air conditioning system, a battery heat exchange system, and a PTC heating system;

[0006] The battery heat exchange system includes a separate heat pipe, and is connected to the PTC heating system and the air conditioning system through the separate heat pipe to perform heat exchange;

[0007] The air conditioning system and the battery heat exchange system both include solenoid valves, wherein the combination of closed states of the solenoid valves is used to control a thermal management mode;

[0008] The thermal management modes include a battery passenger compartment cooling mode, a battery heating mode, and a battery passenger compartment heating mode, wherein in the battery passenger compartment cooling mode, the water pump in the PTC heating system does not work.

[0009] The system of the present application realizes the combination of solenoid valve closed states through the solenoid valves of the air conditioning system and the solenoid valves of the battery heat exchange system, and then realizes the control of the battery passenger compartment cooling mode, the battery heating mode and the battery passenger compartment heating mode to meet the thermal management requirements in different scenarios. On the other hand, the present application can reduce the energy consumption of the thermal management process by separating the heat pipe and reducing the working time of the water pump in the PTC heating system.

[0010] In an optional embodiment, the air conditioning system includes a first solenoid valve, a second solenoid valve, a seventh solenoid valve, and an eighth solenoid valve, the battery heat exchange system includes a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve and a first water pump, and the water pump of the PTC heating system is the second water pump;

[0011] When the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are closed, the thermal management mode is the battery passenger compartment cooling mode, the air conditioning system performs heat exchange with the battery heat exchange system, the first water pump works, and the second water pump does not work;

[0012] When the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, and the eighth solenoid valve are closed, the thermal management mode is the battery passenger compartment heating mode.

[0013] This optional implementation can achieve a battery passenger compartment cooling mode by closing the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve, with the first water pump working and the second water pump not working.

[0014] In an optional implementation, when the fifth solenoid valve and the sixth solenoid valve are closed, the thermal management mode is the battery heating mode, and the PTC heating system performs heat exchange with the battery heat exchange system.

[0015] This optional implementation can achieve the battery heating mode by closing the fifth solenoid valve and the sixth solenoid valve.

[0016] In an optional embodiment, the air conditioning system further includes a compressor, a condenser, a first expansion valve, a second expansion valve evaporator and the battery cooler;

[0017] In the battery passenger compartment cooling mode, the refrigerant in the air-conditioning system is compressed by the compressor and flows to the first solenoid valve, then flows through the condenser and then flows through the first expansion valve and the second expansion valve, and respectively flows through the evaporator and the battery cooler and the second solenoid valve, and finally converges to flow to the compressor. The working fluid in the battery heat exchange system absorbs heat and evaporates in the battery cold plate, flows through the third solenoid valve and the fourth solenoid valve, and then flows to the battery cooler to exchange heat with the refrigerant in the air-conditioning system for condensation, and finally flows to the battery cold plate through the first heat exchanger in the battery heat exchange system.

[0018] This optional implementation can achieve heat exchange between the refrigerant in the air-conditioning system and the working fluid of the battery heat exchange system through the compressor, the condenser, the first expansion valve, the second expansion valve evaporator and the battery cooler.

[0019] In an optional embodiment, in the battery passenger compartment cooling mode, the heat pipe flow path of the separate heat pipe flowing through the battery cold plate is an evaporation section, and the heat pipe flow path of the separate heat pipe flowing through the battery cooler is a condensation section.

[0020] In an optional embodiment, the PTC heating system includes a PTC heater and the second heat exchanger;

[0021] In the battery heating mode, water in the PTC heating system flows to the PTC heater through the second water pump. After being heated, the water flows to the second heat exchanger to exchange heat with the working fluid in the battery heat exchange system. After the heated working fluid evaporates, it flows to the battery cold plate to heat the battery. After condensation, it flows to the first water pump and finally flows back to the second heat exchanger through the fifth solenoid valve and the sixth solenoid valve.

[0022] This optional implementation can achieve electromagnetic heating through the PTC heater and the second heat exchanger.

[0023] In an optional embodiment, in the battery heating mode, the heat pipe flow path of the separate heat pipe flowing through the battery cold plate is a condensation section, and the heat pipe flow path of the separate heat pipe flowing through the second heat exchanger is an evaporation section.

[0024] In an optional embodiment, in the battery passenger compartment heating mode, the high-temperature and high-pressure refrigerant in the air-conditioning system flows out of the compressor and passes through the seventh solenoid valve, and after the evaporator exchanges heat with the passenger compartment, flows through the condenser to absorb heat, and finally returns to the compressor through the eighth solenoid valve.

[0025] This optional implementation can realize self-heat circulation of the air-conditioning system.

[0026] In a second aspect, the present invention provides a battery thermal management method, which is applied to a battery thermal management system based on a separate heat pipe as described in any one of the aforementioned embodiments, and the method comprises:

[0027] Get the battery thermal load;

[0028] Based on the battery heat load, the solenoid valve of the air conditioning system and the solenoid valve of the battery heat exchange system are controlled to be closed and combined, and the working states of the first water pump of the battery heat exchange system and the second water pump of the PCT heating system are controlled.

[0029] The present application obtains the battery thermal load, and then can control the solenoid valve of the air-conditioning system and the solenoid valve of the battery heat exchange system to be closed and combined based on the battery thermal load, and control the working states of the first water pump of the battery heat exchange system and the second water pump of the PCT heating system.

[0030] In a third aspect, the present invention provides a vehicle, comprising a battery thermal management system based on a separate heat pipe as described in any one of the aforementioned embodiments.

[0031] The vehicle of the present application can realize the control of battery passenger compartment cooling mode, battery heating mode and battery passenger compartment heating mode based on the closed state combination of the solenoid valve to meet the thermal management requirements in different scenarios. On the other hand, the energy consumption of the thermal management process can be reduced by separating the heat pipe and reducing the working time of the water pump in the PTC heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a schematic diagram of a battery thermal management system based on a separate heat pipe disclosed in an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of a battery passenger compartment cooling mode disclosed in an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of a separate heat pipe in a battery cooling mode disclosed in an embodiment of the present application;

[0036] Figure 4 is a schematic diagram of a battery heating mode disclosed in an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of a battery passenger compartment heating mode disclosed in an embodiment of the present application;

[0038] Figure 6 It is a schematic diagram of a separate heat pipe in a battery heating mode disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0040] The battery thermal management system based on the separated heat pipe of the embodiment of the present application includes: an air conditioning system, a battery heat exchange system, and a PTC heating system; the battery heat exchange system includes a separated heat pipe, and is connected to the PTC heating system and the air conditioning system through the separated heat pipe to perform heat exchange. The air conditioning system and the battery heat exchange system both include solenoid valves, wherein the closed state combination of the solenoid valves is used to control the thermal management mode.

[0041] Further, the thermal management mode includes a battery passenger compartment cooling mode, a battery heating mode and a battery passenger compartment heating mode, wherein in the battery passenger compartment cooling mode, the water pump in the PTC heating system does not work.

[0042] The system of the embodiment of the present application realizes the combination of solenoid valve closed states through the solenoid valve of the air conditioning system and the solenoid valve of the battery heat exchange system, and then realizes the control of the battery passenger compartment cooling mode, the battery heating mode and the battery passenger compartment heating mode through the combination of solenoid valve closed states to meet the thermal management requirements in different scenarios. On the other hand, the present application can reduce the energy consumption of the thermal management process by separating the heat pipe and reducing the working time of the water pump in the PTC heating system.

[0043] The principle of reducing the energy consumption of the thermal management process by separating the heat pipe and reducing the working time of the water pump in the PTC heating system in the embodiment of the present application is as follows:

[0044] The separate heat pipe has the characteristic of high heat transfer coefficient, and the high heat transfer coefficient of the separate heat pipe can improve the heat exchange efficiency. In this way, under the premise of the same heat exchange amount, the separate heat pipe requires a shorter working time than air and other heat exchange methods, and thus consumes less energy. On the other hand, in the battery passenger compartment cooling mode, the water pump in the PTC heating system does not work. In this way, when meeting the thermal management requirements of different scenarios, the water pump in the PTC heating system does not need to work in every scenario, that is, the working time of the water pump in the PTC heating system is reduced, thereby saving part of the energy consumed by driving the water pump in the PTC heating system.

[0045] In the embodiments of the present application, as an optional implementation, please refer to Figure 1 , Figure 1 is a schematic diagram of a battery thermal management system based on a separate heat pipe disclosed in an embodiment of the present application, such as Figure 1 As shown, the air conditioning system includes multiple solenoid valves, which are the first solenoid valve, the second solenoid valve, the seventh solenoid valve, and the eighth solenoid valve. The battery heat exchange system includes the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve and the first water pump. The water pump of the PTC heating system is the second water pump.

[0046] Specifically, when the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are closed, the thermal management mode is the battery passenger compartment cooling mode, the air conditioning system and the battery heat exchange system perform heat exchange, the first water pump works, and the second water pump does not work;

[0047] Specifically, when the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, and the eighth solenoid valve are closed, the thermal management mode is the battery passenger compartment heating mode.

[0048] This optional implementation can achieve a battery passenger compartment cooling mode by closing the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve, operating the first water pump and not operating the second water pump.

[0049] In the embodiment of the present application, as an optional implementation, when the fifth solenoid valve and the sixth solenoid valve are closed, the thermal management mode is the battery heating mode, and the PTC heating system performs heat exchange with the battery heat exchange system.

[0050] This optional implementation can achieve the battery heating mode by closing the fifth solenoid valve and the sixth solenoid valve.

[0051] In an embodiment of the present application, as an optional implementation, the air-conditioning system further includes a compressor, a condenser, a first expansion valve, a second expansion valve evaporator and a battery cooler.

[0052] For further information, see Figure 2 , Figure 2 Schematic diagram of a battery passenger compartment cooling mode disclosed in an embodiment of the present application. Figure 2 As shown, in the battery passenger compartment cooling mode, the refrigerant in the air-conditioning system is compressed by the compressor and flows to the first solenoid valve, then passes through the condenser and is divided into the first expansion valve and the second expansion valve, and respectively flows through the evaporator and the battery cooler and the second solenoid valve, and finally converges to flow to the compressor, the working fluid in the battery heat exchange system absorbs heat and evaporates in the battery cold plate, flows through the third solenoid valve and the fourth solenoid valve, and then flows to the battery cooler for heat exchange and condensation with the refrigerant in the air-conditioning system, and finally flows to the battery cold plate through the first heat exchanger in the battery heat exchange system.

[0053] This optional implementation can achieve heat exchange between the refrigerant in the air-conditioning system and the working fluid of the battery heat exchange system through a compressor, a condenser, a first expansion valve, a second expansion valve evaporator and a battery cooler.

[0054] For further information, see Figure 3 , Figure 3 Schematic diagram of a separate heat pipe in a battery cooling mode disclosed in an embodiment of the present application. Figure 3 As shown, in the battery passenger compartment cooling mode, the heat pipe flow path of the separated heat pipe flowing through the battery cold plate is the evaporation section, and the heat pipe flow path of the separated heat pipe flowing through the battery cooler is the condensation section.

[0055] In the embodiment of the present application, as an optional implementation, the PTC heating system includes a PTC heater and a second heat exchanger;

[0056] For further information, see Figure 4 , Figure 4 Schematic diagram of a battery heating mode disclosed in an embodiment of the present application. Figure 4 As shown, in the battery heating mode, the water in the PTC heating system flows to the PTC heater through the second water pump, and after the water is heated, it flows to the second heat exchanger to exchange heat with the working fluid in the battery heat exchange system, and the heated working fluid evaporates and flows to the battery cold plate to heat the battery, and after condensation, it flows to the first water pump, and finally flows back to the second heat exchanger through the fifth solenoid valve and the sixth solenoid valve.

[0057] This optional implementation can achieve electromagnetic heating through a PTC heater and a second heat exchanger.

[0058] In the embodiment of the present application, as an optional implementation, please refer to Figure 5 , Figure 5 Schematic diagram of a battery passenger compartment heating mode disclosed in an embodiment of the present application. Figure 5 As shown, in the battery passenger compartment heating mode, the high-temperature and high-pressure refrigerant in the air-conditioning system flows out of the compressor and passes through the seventh solenoid valve, and after the evaporator exchanges heat with the passenger compartment, flows through the condenser to absorb heat, and finally returns to the compressor through the eighth solenoid valve.

[0059] This optional implementation can realize self-heat circulation of the air-conditioning system.

[0060] In the embodiment of the present application, as an optional implementation, please refer to Figure 6 , Figure 6 Schematic diagram of a separate heat pipe in a battery heating mode disclosed in an embodiment of the present application. Figure 6 As shown, in the battery heating mode, the heat pipe flow path of the separated heat pipe flowing through the battery cold plate is the condensation section, and the heat pipe flow path of the separated heat pipe flowing through the second heat exchanger is the evaporation section.

[0061] In addition, an embodiment of the present application further provides a battery thermal management method, which is applied to a battery thermal management system based on a separate heat pipe as in any of the aforementioned embodiments, and the method comprises the following steps:

[0062] Get the battery thermal load;

[0063] Based on the battery heat load, the solenoid valve of the air conditioning system and the solenoid valve of the battery heat exchange system are closed and combined, and the working states of the first water pump of the battery heat exchange system and the second water pump of the PCT heating system are controlled.

[0064] The method of the embodiment of the present application obtains the battery thermal load, and then can control the solenoid valve of the air-conditioning system and the solenoid valve of the battery heat exchange system to close and combine based on the battery thermal load, and control the working states of the first water pump of the battery heat exchange system and the second water pump of the PCT heating system.

[0065] On the other hand, an embodiment of the present application also provides a vehicle, the vehicle including a battery thermal management system based on a separate heat pipe as in any of the aforementioned embodiments.

[0066] The vehicle of the embodiment of the present application can realize the control of the battery passenger compartment cooling mode, the battery heating mode and the battery passenger compartment heating mode based on the closed state combination of the solenoid valve to meet the thermal management requirements in different scenarios. On the other hand, the energy consumption of the thermal management process can be reduced by separating the heat pipe and reducing the working time of the water pump in the PTC heating system.

[0067] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0068] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0069] Furthermore, the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0070] It should be noted that if the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0071] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0072] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery thermal management system based on a separate heat pipe, characterized in that: The system includes: an air conditioning system, a battery heat exchange system, and a PTC heating system; The battery heat exchange system includes a separate heat pipe, and is connected to the PTC heating system and the air conditioning system through the separate heat pipe to perform heat exchange; The air conditioning system and the battery heat exchange system both include solenoid valves, wherein the combination of closed states of the solenoid valves is used to control a thermal management mode; The thermal management modes include a battery passenger compartment cooling mode, a battery heating mode, and a battery passenger compartment heating mode, wherein in the battery passenger compartment cooling mode, the water pump in the PTC heating system does not work.

2. The system according to claim 1, characterized in that The air conditioning system includes a first solenoid valve, a second solenoid valve, a seventh solenoid valve, and an eighth solenoid valve, the battery heat exchange system includes a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve and a first water pump, and the water pump of the PTC heating system is a second water pump; When the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are closed, the thermal management mode is the battery passenger compartment cooling mode, the air conditioning system performs heat exchange with the battery heat exchange system, the first water pump works, and the second water pump does not work; When the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, and the eighth solenoid valve are closed, the thermal management mode is the battery passenger compartment heating mode.

3. The system according to claim 2, characterized in that When the fifth solenoid valve and the sixth solenoid valve are closed, the thermal management mode is the battery heating mode, and the PTC heating system performs heat exchange with the battery heat exchange system.

4. The system according to claim 2, characterized in that The air conditioning system also includes a compressor, a condenser, a first expansion valve, a second expansion valve evaporator and a battery cooler; In the battery passenger compartment cooling mode, the refrigerant in the air-conditioning system is compressed by the compressor and flows to the first solenoid valve, then flows through the condenser and then flows through the first expansion valve and the second expansion valve, and respectively flows through the evaporator and the battery cooler and the second solenoid valve, and finally converges to flow to the compressor. The working fluid in the battery heat exchange system absorbs heat and evaporates in the battery cold plate, flows through the third solenoid valve and the fourth solenoid valve, and then flows to the battery cooler to exchange heat with the refrigerant in the air-conditioning system for condensation, and finally flows to the battery cold plate through the first heat exchanger in the battery heat exchange system.

5. The system according to claim 4, characterized in that In the battery passenger compartment cooling mode, the heat pipe flow path of the separate heat pipe flowing through the battery cold plate is an evaporation section, and the heat pipe flow path of the separate heat pipe flowing through the battery cooler is a condensation section.

6. The system according to claim 4, characterized in that The PTC heating system comprises a PTC heater and a second heat exchanger; In the battery heating mode, water in the PTC heating system flows to the PTC heater through the second water pump. After being heated, the water flows to the second heat exchanger to exchange heat with the working fluid in the battery heat exchange system. After the heated working fluid evaporates, it flows to the battery cold plate to heat the battery. After condensation, it flows to the first water pump and finally flows back to the second heat exchanger through the fifth solenoid valve and the sixth solenoid valve.

7. The system according to claim 6, characterized in that In the battery heating mode, the heat pipe flow path of the separate heat pipe flowing through the battery cold plate is a condensation section, and the heat pipe flow path of the separate heat pipe flowing through the second heat exchanger is an evaporation section.

8. The system according to claim 4, characterized in that In the battery passenger compartment heating mode, the high-temperature and high-pressure refrigerant in the air-conditioning system flows out of the compressor and passes through the seventh solenoid valve, and after the evaporator exchanges heat with the passenger compartment, flows through the condenser to absorb heat, and finally returns to the compressor through the eighth solenoid valve.

9. A battery thermal management method, characterized in that: The method is applied to a battery thermal management system based on a separate heat pipe as claimed in any one of claims 1 to 8, and the method comprises: Get the battery thermal load; Based on the battery heat load, the solenoid valve of the air conditioning system and the solenoid valve of the battery heat exchange system are controlled to be closed and combined, and the working states of the first water pump of the battery heat exchange system and the second water pump of the PCT heating system are controlled.

10. A vehicle, characterized in that: The vehicle includes a battery thermal management system based on a separate heat pipe as described in any one of claims 1-8.

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