CN108054459B - Thermal management system and thermal management method for vehicle battery pack - Google Patents

Thermal management system and thermal management method for vehicle battery pack Download PDF

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Publication number
CN108054459B
CN108054459B CN201711065487.1A CN201711065487A CN108054459B CN 108054459 B CN108054459 B CN 108054459B CN 201711065487 A CN201711065487 A CN 201711065487A CN 108054459 B CN108054459 B CN 108054459B
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battery pack
thermal management
temperature
threshold value
water circulation
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CN108054459A (en
Inventor
胡攀
陈东亚
李连豹
韦虹
李军
王瑞平
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Ningbo Geely Royal Engine Components Co Ltd
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Ningbo Geely Royal Engine Components Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • H01M10/633Control systems characterised by algorithms, flow charts, software details or the like
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567Liquids
    • H01M10/6568Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/66Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/663Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/20Batteries in motive systems, e.g. vehicle, ship, plane
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a thermal management system and a thermal management method for a vehicle battery pack, and relates to the technical field of vehicles. The thermal management system of vehicle battery package includes ambient temperature sensor, battery temperature sensor, electronic control unit and water circulation passageway, water circulation passageway passes through electronic water pump, battery package, radiator and air conditioner cooling device in proper order for the conduction the heat that the battery package produced, works as the temperature that ambient temperature sensor detected out does not exceed first threshold value, and the temperature that battery temperature sensor detected out reaches the second threshold value and when not exceeding the third threshold value, the radiator with air conditioner cooling device is right together the battery package cools off. The invention also provides a corresponding heat management method. By the invention, the endurance mileage of the vehicle battery pack can be prolonged, and the fuel consumption of the vehicle can be reduced for a hybrid vehicle, so that the effects of energy conservation and emission reduction are greatly improved.

Description

Thermal management system and thermal management method for vehicle battery pack
Technical Field
The invention relates to the technical field of vehicles, in particular to a thermal management system and a thermal management method for a vehicle battery pack.
Background
At the present stage, the battery pack is used as a main power source for the operation of the pure electric vehicle and the hybrid vehicle, and the condition requirements required to be met by the normal operation of the battery pack are severe, wherein on one hand, the operating temperature of the battery pack is required to be within a certain temperature range so as to be capable of operating in an optimal state.
At present, in order to stabilize the working temperature of the battery pack within a certain range, the air conditioning system is usually only adopted to cool the battery pack, or the radiator is adopted to cool the battery pack when the battery pack is in a low-temperature state, and the air conditioning system is adopted to cool the battery pack when the battery pack is in a high-temperature state.
By adopting the mode to cool the battery pack, the air conditioning system consumes more electric quantity which is provided by the vehicle battery pack, so the shortening of the endurance mileage of the vehicle battery pack is caused as a result, and for the hybrid power vehicle, the shortening of the endurance mileage of the battery pack directly causes the increase of the fuel consumption of the vehicle, which is completely against the concept of energy conservation and emission reduction advocated by the current country.
Disclosure of Invention
The invention aims to provide a thermal management system of a vehicle battery pack, which can reduce the energy loss of an air conditioning system when the battery pack is cooled, thereby prolonging the endurance mileage of the battery pack, and reducing the fuel consumption of a vehicle for a hybrid vehicle, so as to finally achieve the purposes of energy conservation and emission reduction.
The invention also aims to provide a thermal management method for the vehicle battery pack, by the method, the energy loss of an air conditioning system can be fully reduced when the battery pack is cooled, so that the endurance mileage of the battery pack is prolonged, and for a hybrid vehicle, the vehicle oil consumption can be reduced, and the aims of energy conservation and emission reduction are finally achieved.
In particular, the present invention provides a thermal management system for a vehicle battery pack for regulating the temperature of the battery pack, comprising:
an ambient temperature sensor for detecting a temperature of an environment surrounding the battery pack;
the battery temperature sensor is arranged at the battery pack and used for detecting the temperature of the battery pack;
the electronic control unit is respectively connected with the environment temperature sensor and the battery temperature sensor and is used for receiving and judging the temperature detected by the environment temperature sensor and the temperature detected by the battery temperature sensor; and
the water circulation channel sequentially passes through the electronic water pump, the battery pack, the radiator and the air conditioner cooling device and is used for conducting heat generated by the battery pack, the electronic control unit receives and judges that the temperature detected by the environment temperature sensor does not exceed a first threshold value, and when the temperature detected by the battery temperature sensor reaches a second threshold value and does not exceed a third threshold value, the radiator and the air conditioner cooling device are together passed through the water circulation channel to cool the battery pack.
Further, the first threshold is 25 ℃;
optionally, the second threshold is 30 ℃ and the third threshold is 35 ℃.
Further, the air-conditioning cooling device comprises an air-conditioning system and a cooling device, the water circulation channel passes through a water side inlet end and a water side outlet end of the cooling device, and the air-conditioning system is connected with a refrigerant side port of the cooling device.
Furthermore, the electronic control unit is connected with the electronic water pump and is used for controlling the working state of the electronic water pump;
optionally, the electronic control unit is connected to the air conditioning system, and is configured to control a working state of the air conditioning system.
The water circulation channel passes through the heating system, when the electronic control unit receives and judges that the temperature detected by the battery temperature sensor does not reach a fourth threshold value, the water circulation channel sequentially passes through the electronic water pump, the battery pack, the heating system and the air-conditioning cooling device, the air-conditioning cooling device is in a non-working state, and the heating system is in a working state to heat the battery pack;
optionally, the fourth threshold is 10 ℃.
Furthermore, the heating system comprises a heat exchanger and a heating device, the water circulation channel passes through a cold side water jacket inlet end and a cold side water jacket outlet end of the heat exchanger, and the heating device is connected with a hot side water jacket port of the heat exchanger.
Further, the electronic control unit is connected with the heating device and used for controlling the working state of the heating device.
The water circulation channel passes through the three-way control valve, and meanwhile, the three-way control valve is also connected with the electronic control unit, and the electronic control unit controls the opening and closing of three ports of the three-way control valve, so that the radiator is selectively connected into the water circulation channel.
Further, still include the water-cooling intercooler, be located the electronic water pump with between the heating system, just water circulating channel passes through the water-cooling intercooler for reduce vehicle engine's the temperature of admitting air.
Particularly, the invention also provides a thermal management method of a vehicle battery pack, which is used for regulating the temperature of the battery pack and comprises the following steps:
detecting the temperature of the environment around the battery pack and the temperature of the battery pack;
when the temperature of the environment around the battery pack does not exceed a first threshold value, and the temperature of the battery pack reaches a second threshold value and does not exceed a third threshold value, the heat radiator and the air-conditioning cooling device together cool the battery pack through the water circulation channel;
optionally, the first threshold is 25 ℃;
optionally, the second threshold is 30 ℃, and the third threshold is 35 ℃;
optionally, the method further includes the step of cooling the battery pack through the water circulation channel only by using the heat sink when the temperature of the environment around the battery pack does not exceed a first threshold, and the temperature of the battery pack reaches a fourth threshold and does not exceed a second threshold;
optionally, the fourth threshold is 10 ℃;
optionally, the method further comprises the step of cooling the battery pack only by using the air conditioner cooling device through the water circulation channel when the temperature of the environment around the battery pack exceeds a first threshold;
optionally, the method further comprises the step of heating the battery pack only by using the heating system through the water circulation channel when the temperature of the battery pack does not reach a fourth threshold value.
According to the thermal management system and the thermal management method for the vehicle battery pack, the vehicle battery pack is cooled by combining the radiator and the air conditioner cooling device within a certain battery pack temperature range and a certain ambient temperature range around the battery pack, and the energy loss of the air conditioner cooling device is greatly reduced by applying the radiator within the temperature range, so that the endurance mileage of the battery pack can be prolonged, and the fuel consumption of a vehicle can be reduced for a hybrid vehicle, so that the effects of energy conservation and emission reduction are greatly improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a functional block diagram of a thermal management system for a vehicle battery pack according to one embodiment of the present invention;
fig. 2 is a flowchart of a method of thermal management of a vehicle battery pack according to one embodiment of the invention.
Detailed Description
Fig. 1 is a schematic block diagram of a thermal management system of a vehicle battery pack according to one embodiment of the present invention, which is used to regulate the temperature of the battery pack, as shown in fig. 1, and may generally include an ambient temperature sensor 1, a battery temperature sensor 2, an electronic control unit 3, and a water circulation passage 4. The ambient temperature sensor 1 is used to detect the temperature of the environment around the battery pack. The battery temperature sensor 2 is installed at the battery pack and used for detecting the temperature of the battery pack. The electronic control unit 3 is respectively connected with the environment temperature sensor 1 and the battery temperature sensor 2, and is used for receiving and judging the temperature detected by the environment temperature sensor 1 and the temperature detected by the battery temperature sensor 2. The water circulation channel 4 sequentially passes through the electronic water pump 5, the battery pack 6, the radiator 7 and the air-conditioning cooling device 8 according to the flowing direction of circulating water and is used for conducting heat generated by the battery pack 6, and when the electronic control unit 3 receives and judges that the temperature detected by the environment temperature sensor 1 does not exceed a first threshold value, and the temperature detected by the battery temperature sensor 2 reaches a second threshold value and does not exceed a third threshold value, the radiator 7 and the air-conditioning cooling device 8 cool the battery pack 6 through the water circulation channel 4. Here, the first threshold may be 25 ℃, the second threshold may be 30 ℃, and the third threshold may be 35 ℃.
According to the thermal management system of the vehicle battery pack, the vehicle battery pack is cooled by combining the radiator 7 and the air conditioner cooling device 8 within a certain battery pack temperature range and a certain ambient temperature range around the battery pack, and the energy loss of the air conditioner cooling device 8 is greatly reduced by applying the radiator 7 within the temperature range, so that the endurance mileage of the battery pack can be prolonged, and the fuel consumption of a vehicle can be reduced for a hybrid vehicle, so that the effects of energy conservation and emission reduction are greatly improved.
In one embodiment of the present invention, the air-conditioning cooling device 8 may include an air-conditioning system 9 and a cooling device 10, the water circulation passage 4 passes through a water-side inlet end and a water-side outlet end of the cooling device 10, and the air-conditioning system 9 is connected to a refrigerant-side port of the cooling device 10. By connecting the air conditioning system 9 to the refrigerant side port of the cooling device 10, the air conditioning system 9 can cool the water in the water circulation passage 4, thereby achieving the purpose of reducing the temperature of the battery pack 6. Here, it will be understood by those skilled in the art that the cooling device 10 may be a water cooling device, or may be other devices capable of providing a heat exchange site in the cooling device, which will not be described in detail herein.
In particular, the electronic control unit 3 may be connected to the electronic water pump 5 for controlling the operating state of the electronic water pump 5. The electronic control unit 3 may be connected to the air conditioning system 9 for controlling the operating state of the air conditioning system 9.
Therefore, in an embodiment of the present invention, the thermal management system of the vehicle battery pack may further include a heating system 11 located between the battery pack 6 and the radiator 7, the water circulation channel 4 passes through the heating system 11, when the electronic control unit 3 receives and determines that the temperature detected by the battery temperature sensor 2 does not reach a fourth threshold, the water circulation channel 4 passes through the electronic water pump 5, the battery pack 6, the heating system 11 and the air-conditioning cooling device 8 in sequence, the air-conditioning cooling device 8 is in a non-working state, and the heating system 11 is in a working state to heat the battery pack 6. Here, the fourth threshold may be 10 ℃. The heating system 11 heats the battery pack 6, so that the normal work of the battery pack 6 is fully ensured, and the stable operation of a vehicle is facilitated.
In particular, in one embodiment of the present invention, the heating system 11 may include a heat exchanger 12 and a heating device 13, the water circulation passage 4 passes through a cold side water jacket inlet end and a cold side water jacket outlet end of the heat exchanger 12, and the heating device 13 is connected to a hot side water jacket port of the heat exchanger 12. The arrangement of the heat exchanger 12 provides a heat exchange place for water in the water circulation channel 4, so that the heating device 13 can smoothly transfer heat into the battery pack 6 through the water circulation channel 4, and the normal operation of the battery pack 6 is ensured. Here, it will be understood by those skilled in the art that the heating device 13 may be an electric heating device, or may be other suitable heating devices existing in the prior art, and will not be described in detail herein.
In particular, the electronic control unit 3 may be connected to the heating device 13 for controlling the operating state of the heating device 13.
In order to conveniently connect the required heating or cooling equipment in the water circulation channel 4, in an embodiment of the present invention, the thermal management system of the vehicle battery pack may further include a three-way control valve 14, which is respectively connected to the heating system 11 and the radiator 7 and the air-conditioning cooling device 8, the water circulation channel 4 passes through the three-way control valve 14, and the three-way control valve 14 is also connected to the electronic control unit 3, and the electronic control unit 3 controls the three ports of the three-way control valve 14 to open and close, so as to selectively connect the radiator 7 into the water circulation channel 4. Specifically, when the heat sink 7 and the air-conditioning cooling device 8 are required to cool the battery pack 6, as shown in fig. 1, the electronic control unit 3 controls the end a and the end c of the three-way control valve 14 to communicate with each other, so that the heat sink 7 and the air-conditioning cooling device 8 can cool the battery pack 6 through the water circulation channel 4. When the heating system 11 is required to heat the battery pack 6, as shown in fig. 1, the electronic control unit 3 controls the a-side and the b-side of the three-way control valve 14 to communicate with each other, so that the heating system 11 is connected to the water circulation passage 4, thereby heating the battery pack 6 in a timely manner.
The above thermal management system can be applied to pure electric vehicles and hybrid vehicles, and for hybrid vehicles with supercharged engines, in an embodiment of the present invention, the thermal management system of the vehicle battery pack can further include a water-cooled intercooler 15 located between the electronic water pump 5 and the heating system 11, and the water circulation channel 4 passes through the water-cooled intercooler 15 for reducing the intake air temperature of the vehicle engine. The water-cooled intercooler 15 is connected into the water circulation channel 4, so that the temperature of the battery pack 6 is reduced by the heat management system, and meanwhile, the gas to enter the engine can be fully reduced, the air inlet temperature of the engine is controlled at a lower level all the time, the fuel consumption of the hybrid vehicle is fully reduced, and the effects of energy conservation and emission reduction are further improved.
In particular, the present invention also provides a thermal management method for a vehicle battery pack, as shown in fig. 2, fig. 2 is a flowchart of a thermal management method for a vehicle battery pack according to an embodiment of the present invention, which may generally include the following steps:
s100, detecting the temperature of the environment around the battery pack and the temperature of the battery pack;
and S200, when the temperature of the environment around the battery pack does not exceed a first threshold value, and the temperature of the battery pack reaches a second threshold value and does not exceed a third threshold value, the radiator and the air conditioner cooling device together cool the battery pack through the water circulation channel. Here, the first threshold may be 25 ℃; the second threshold may be 30 ℃ and the third threshold may be 35 ℃.
According to the heat management method of the vehicle battery pack, the radiator 7 and the air conditioning system are combined to cool the vehicle battery pack within a certain battery pack temperature range and a certain ambient temperature range around the battery pack, and the energy loss of the air conditioning system is greatly reduced by applying the radiator 7 within the temperature range, so that the cruising range of the battery pack can be prolonged, and the fuel consumption of a vehicle can be reduced for a hybrid vehicle, so that the effects of energy conservation and emission reduction are greatly improved.
In addition, in other temperature ranges, the method for thermally managing a vehicle battery pack may further include the step of cooling the battery pack through the water circulation passage only using the radiator when the temperature of the environment around the battery pack does not exceed the first threshold, and the temperature of the battery pack reaches the fourth threshold and does not exceed the second threshold. Here, the fourth threshold may be 10 ℃.
Meanwhile, the method can further comprise the step of cooling the battery pack through the water circulation channel only by using the air conditioner cooling device when the temperature of the environment around the battery pack exceeds a first threshold value.
Further, when the temperature of the battery pack is too low to cause the abnormal operation or the low working efficiency, the method can further comprise the step of heating the battery pack only by adopting the heating system through the water circulation channel when the temperature of the battery pack does not reach a fourth threshold value.
In conclusion, the heat management method of the vehicle battery pack cools the battery pack by independently adopting the radiator or the air-conditioning cooling device or combining the radiator and the air-conditioning cooling device in different temperature ranges, so that the normal work of the battery pack is effectively ensured, the service life of the battery pack is prolonged, and the energy loss of the air-conditioning cooling device is greatly reduced, so that the endurance mileage of the battery pack can be prolonged, and for a hybrid vehicle, the fuel consumption of the vehicle can be reduced, thereby greatly improving the effects of energy conservation and emission reduction.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations or modifications which are consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (19)

1. A thermal management system for a vehicle battery pack for regulating the temperature of the battery pack, comprising:
an ambient temperature sensor for detecting a temperature of an environment surrounding the battery pack;
the battery temperature sensor is arranged at the battery pack and used for detecting the temperature of the battery pack;
the electronic control unit is respectively connected with the environment temperature sensor and the battery temperature sensor and is used for receiving and judging the temperature detected by the environment temperature sensor and the temperature detected by the battery temperature sensor; and
the water circulation channel sequentially passes through the electronic water pump, the battery pack, the radiator and the air conditioner cooling device and is used for conducting heat generated by the battery pack, and when the electronic control unit receives and judges that the temperature detected by the environment temperature sensor does not exceed a first threshold value, and the temperature detected by the battery temperature sensor reaches a second threshold value and does not exceed a third threshold value, the radiator and the air conditioner cooling device together cool the battery pack through the water circulation channel;
when the temperature of the environment around the battery pack does not exceed a first threshold value, and the temperature of the battery pack reaches a fourth threshold value and does not exceed a second threshold value, only cooling the battery pack by using the radiator through the water circulation channel;
and when the temperature of the surrounding environment of the battery pack exceeds a first threshold value, only adopting the air conditioner cooling device to cool the battery pack through the water circulation channel.
2. The vehicle battery pack thermal management system of claim 1, wherein the first threshold is 25 ℃.
3. The vehicle battery pack thermal management system of claim 1, wherein the second threshold is 30 ℃.
4. The vehicle battery pack thermal management system of claim 1, wherein the third threshold is 35 ℃.
5. The vehicle battery pack thermal management system according to any one of claims 1 to 4, wherein the air-conditioning cooling device includes an air-conditioning system and a cooling device, the water circulation passage passes through a water-side inlet end and a water-side outlet end of the cooling device, and the air-conditioning system is connected to a refrigerant-side port of the cooling device.
6. The vehicle battery pack thermal management system of claim 5, wherein the electronic control unit is connected to the electronic water pump for controlling an operating state of the electronic water pump.
7. The vehicle battery pack thermal management system of claim 6, wherein the electronic control unit is coupled to the air conditioning system for controlling an operating state of the air conditioning system.
8. The vehicle battery pack thermal management system according to any one of claims 1 to 4, further comprising a heating system located between the battery pack and the radiator, wherein the water circulation passage passes through the heating system, and when the electronic control unit receives and judges that the temperature detected by the battery temperature sensor does not reach a fourth threshold value, the water circulation passage passes through the electronic water pump, the battery pack, the heating system and the air-conditioning cooling device in sequence, the air-conditioning cooling device is in a non-working state, and the heating system is in a working state to heat the battery pack.
9. The vehicle battery pack thermal management system of claim 1, wherein the fourth threshold is 10 ℃.
10. The vehicle battery pack thermal management system of claim 8, comprising a heat exchanger and a heating device, wherein the water circulation channel passes through a cold side water jacket inlet end and a cold side water jacket outlet end of the heat exchanger, and the heating device is connected to a hot side water jacket port of the heat exchanger.
11. The vehicle battery pack thermal management system of claim 10, wherein the electronic control unit is coupled to the heating device for controlling an operating state of the heating device.
12. The vehicle battery pack thermal management system according to claim 8, further comprising a three-way control valve connected to the heating system, the radiator and the air conditioning cooling device, respectively, wherein the water circulation passage passes through the three-way control valve, and the three-way control valve is also connected to the electronic control unit, and the electronic control unit controls opening and closing of three ports of the three-way control valve, thereby selectively connecting the radiator to the water circulation passage.
13. The vehicle battery pack thermal management system of claim 8, further comprising a water-cooled intercooler between the electronic water pump and the heating system, and the water circulation passage passes through the water-cooled intercooler for reducing an intake air temperature of a vehicle engine.
14. A thermal management method applied to the thermal management system of a vehicle battery pack according to any one of claims 1 to 13, for regulating the temperature of the battery pack, comprising the steps of:
detecting the temperature of the environment around the battery pack and the temperature of the battery pack;
when the temperature of the environment around the battery pack does not exceed a first threshold value, and the temperature of the battery pack reaches a second threshold value and does not exceed a third threshold value, the heat radiator and the air-conditioning cooling device together cool the battery pack through the water circulation channel;
when the temperature of the environment around the battery pack does not exceed a first threshold value, and the temperature of the battery pack reaches a fourth threshold value and does not exceed a second threshold value, only cooling the battery pack by using the radiator through the water circulation channel;
and when the temperature of the surrounding environment of the battery pack exceeds a first threshold value, only adopting the air conditioner cooling device to cool the battery pack through the water circulation channel.
15. The vehicle battery pack thermal management method according to claim 14, wherein the vehicle battery pack thermal management system further comprises a heating system located between the battery pack and the radiator;
the thermal management method further comprises:
and when the temperature of the battery pack does not reach a fourth threshold value, only heating the battery pack by the heating system through the water circulation channel.
16. The vehicle battery pack thermal management method according to claim 14, wherein the first threshold is 25 ℃.
17. The vehicle battery pack thermal management method according to claim 14, wherein the second threshold is 30 ℃.
18. The vehicle battery pack thermal management method according to claim 14, wherein the third threshold is 35 ℃.
19. The vehicle battery pack thermal management method according to claim 15, wherein the fourth threshold is 10 ℃.
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