Thermal management system of pure electric vehicle and vehicle with thermal management system

Abstract

The utility model discloses a thermal management system of a pure electric vehicle and a vehicle with the thermal management system, relates to the field of thermal management of pure electric vehicles, and aims to solve the problems that in the prior art, a thermal management system is complex, and thermal management is not carried out on a lithium ion starting power supply. And the air conditioner loop exchanges heat with the battery heat management loop to supply cold, and the heating loop exchanges heat with the battery heat management loop to supply heat. According to the utility model, the thermal management of the lithium ion starting power supply can be realized, the air conditioner loop is used for cooling the battery thermal management loop, and the heating loop is used for heating the battery thermal management loop, so that the thermal management of the whole battery thermal management loop is simpler, and the control logic is simpler and more efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of pure electric vehicles, in particular to a thermal management system of a pure electric vehicle and a vehicle with the same. Background Art

[0002] In winter, refined management of power batteries for pure electric vehicles is particularly important. For example, in winter, the dependence and consumption of other high-voltage accessories on the power battery should be reduced to ensure the vehicle's range. At the same time, the power battery must be heated at an appropriate discharge temperature, and the cockpit must be heated. Traditional thermal management solutions require the consumption of power battery power to achieve this. Traditional thermal management generally uses high-voltage PTC or high-pressure liquid PTC, etc. This solution consumes a lot of electricity. In winter, the available power and discharge capacity of the power battery have been greatly reduced. This heating method will undoubtedly make the range of the pure electric vehicle worse. At the same time, when the power battery temperature is low, the power battery also needs to be heated, which also consumes power from the power battery.

[0003] Chinese patent CN114347752A discloses a pure electric vehicle thermal management system and a control method thereof. The technical solution adopted is, including a battery thermal management circuit, a motor cooling circuit, an air conditioning circuit and a warm air heating circuit. The warm air heating circuit includes a fuel heater and a water heater. The battery thermal management circuit includes a first heat exchanger, a second heat exchanger and a third heat exchanger. The first heat exchanger can be selectively connected to the motor cooling circuit, the second heat exchanger can be selectively connected to the air conditioning circuit, and the third heat exchanger can be selectively connected to the warm air heating circuit.

[0004] Although this existing technology can perform thermal management on the power battery assembly, it performs heat exchange between the charging thermal management circuit, the air conditioning circuit, and the heating circuit and the battery thermal management circuit, making the entire thermal management system more complicated. Moreover, this existing technology only performs thermal management on the power battery assembly, but does not perform thermal management on the lithium-ion starting power supply. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a pure electric vehicle thermal management system and a vehicle having the same, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model first discloses a pure electric vehicle thermal management system, which adopts the following technical scheme: including a charging thermal management circuit, an air-conditioning circuit, a heating circuit and a battery thermal management circuit; the charging thermal management circuit includes a radiator, the air-conditioning circuit includes an air-conditioning condenser, and the positions of the radiator and the air-conditioning condenser correspond to each other; the air-conditioning circuit and the battery thermal management circuit are both connected to the refrigerator assembly, and the heating circuit and the battery thermal management circuit are both connected to the heat exchanger; the battery thermal management circuit includes a power battery assembly heat exchange pipeline and a lithium-ion start-stop power supply heat exchange pipeline; the front end of the lithium-ion start-stop power supply heat exchange pipeline is connected to the first interface of the electronic three-way valve, and the rear end is connected to the power battery assembly heat exchange pipeline; the second interface of the electronic three-way valve is connected between the power battery assembly heat exchange pipeline and the lithium-ion start-stop power supply heat exchange pipeline through a branch. The third interface is connected to the first delivery pump, and the front end of the first delivery pump is connected to the refrigerator assembly and the heat exchanger, and then connected to the rear end of the heat exchange pipeline of the power battery assembly to form a loop; the battery thermal management circuit is also connected to a first expansion kettle; by adding a lithium-ion start-stop power supply to the battery thermal management circuit, and setting branches before and after the lithium-ion start-stop power supply through an electronic three-way valve and a three-way pipe fitting, the access state of the lithium-ion start-stop power supply in the battery thermal management circuit can be changed through the electronic three-way valve, thereby achieving simultaneous thermal management of the power battery and the lithium-ion start-stop power supply, and also achieving separate thermal management of the power battery; the air-conditioning circuit includes an evaporator assembly, and the heating circuit includes a heater core assembly, the evaporator assembly and the heater core assembly are positioned correspondingly, and the two constitute a HVAC assembly; it also includes a control device, and the electronic three-way valve and the control device are electrically connected. This not only makes it possible to cool the power battery assembly and the lithium-ion start-stop power supply simultaneously when the air conditioner is cooling, but also makes it possible to use the heating circuit to heat the power battery assembly and the lithium-ion start-stop power supply, and provide a heat source to the air conditioning system to heat the cab, thereby reducing the power battery power consumption by thermal management, and making the overall structure simpler and the control logic more concise.

[0007] As an optimal technical solution of the present invention, the charging thermal management circuit also includes an OBC+DC module cooling pipeline, the rear end of the OBC+DC module cooling pipeline is connected to a second delivery pump, the rear end of the second delivery pump is connected to the cooling pipeline of the motor assembly cooling pipeline and the motor controller cooling pipeline, the rear end of the motor controller cooling pipeline is connected to the radiator and then connected to the front end of the OBC+DC module cooling pipeline to form a loop; there is a second expansion kettle between the OBC+DC module cooling pipeline and the second delivery pump.

[0008] As a preferred technical solution of the present invention, the air conditioning circuit also includes an air conditioning compressor. The rear end of the air conditioning compressor is connected to a pressure switch and then to the air conditioning condenser. The rear end of the air conditioning condenser is connected to the first port of a three-way pipe fitting. The second port of the three-way pipe fitting is connected to a first expansion valve, and the third port is connected to a second expansion valve. The rear end of the second expansion valve is connected to the evaporator assembly and then to the air conditioning compressor, forming a circuit. The first expansion valve is connected to the refrigerator assembly and then to the air conditioning compressor. During air conditioning cooling, a low-temperature liquid medium can be obtained through the air conditioning condenser and the first expansion valve, and the obtained low-temperature liquid medium is used by the refrigerator assembly to provide cooling for the battery thermal management circuit.

[0009] As a preferred technical solution of the present invention, the heating circuit also includes a liquid heater assembly. The antifreeze line of the heating circuit passes through the liquid heater assembly and then connects to a third delivery pump. The third delivery pump is connected to a heat exchanger and then to a heater core assembly. The heater core assembly is connected to the liquid heater assembly to form a loop. The front end of the heater core assembly is connected to a third expansion kettle. The oil inlet of the liquid heater assembly is connected to a fourth delivery pump, which is connected to the fuel tank. The fuel heater heats the antifreeze, which in turn supplies heat to the battery thermal management circuit through the heat exchanger. The heater core assembly also exchanges heat with the evaporator assembly to supply heat to the air conditioning circuit.

[0010] As a preferred technical solution of the present invention, the first expansion kettle is arranged between the first delivery pump and the third interface of the electronic three-way valve.

[0011] The utility model also discloses a pure electric vehicle, which includes the above-mentioned pure electric vehicle thermal management system.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: by adding a lithium-ion start-stop power supply to the battery thermal management circuit, the present invention can perform thermal management on the lithium-ion start-stop power supply while also performing thermal management on the power battery assembly. Branches are set before and after the lithium-ion start-stop power supply through an electronic three-way valve and a three-way pipe fitting. The electronic three-way valve can be used to change the access state of the lithium-ion start-stop power supply in the battery thermal management circuit, thereby achieving simultaneous thermal management of the power battery and the lithium-ion start-stop power supply, and also achieving separate thermal management of the power battery. The charging thermal management circuit does not directly exchange heat with the battery thermal management circuit. The air-conditioning circuit is used to cool the charging thermal management circuit and the battery thermal management circuit, and the heating circuit is used to heat the battery thermal management circuit. This can make the thermal management of the entire battery thermal management circuit simpler and the control logic more concise and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1This is a schematic structural diagram of the utility model.

[0014] In the figure: 1. Power battery assembly heat exchange pipeline; 2. First delivery pump; 3. First expansion kettle; 4. First expansion valve; 5. Refrigeration machine assembly; 6. Second delivery pump; 7. Second expansion kettle; 8. Radiator; 9. Air conditioning condenser; 10. OBC+DC module cooling pipeline; 11. Pressure switch; 12. Motor controller cooling pipeline; 13. Motor assembly cooling pipeline; 14. Air conditioning compressor; 15. Third delivery pump; 16. Liquid heater assembly; 17. HVAC assembly; 18. Third expansion kettle; 19. Evaporator assembly; 20. Fourth delivery pump; 21. Oil inlet; 22. Fuel tank; 23. Heater core assembly; 24. Electronic three-way valve; 2401, first interface; 2402, second interface; 2403, third interface; 25. Lithium-ion start-stop power supply heat exchange pipeline; 26. Second expansion valve; 27. Heat exchanger. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0016] like Figure 1 As shown, the utility model first discloses a pure electric vehicle thermal management system, which adopts a technical solution including a charging thermal management circuit, an air-conditioning circuit, a battery thermal management circuit and a control device. The charging thermal management circuit includes an OBC+DC module cooling pipeline 10, wherein OBC is a charger and DC is a DCDC converter. The rear end of the OBC+DC module cooling pipeline 10 is connected in parallel with a second expansion kettle 7 and a second delivery pump 6. The rear end of the second delivery pump 6 is connected in sequence to a motor assembly cooling pipeline 13 and a motor controller cooling pipeline 12. The rear end of the motor controller cooling pipeline 12 is connected to a radiator 8 and then to the OBC+DC module cooling pipeline 10 to form a loop. A first temperature sensor is connected to the charging thermal management circuit. The first temperature sensor, the second delivery pump 6 and the cooling fan of the radiator 8 are all electrically connected to the microprocessor in the control device.

[0017] To further facilitate rapid cooling at radiator 8, the air conditioning condenser 9 of the air conditioning circuit is positioned relative to radiator 8. The air conditioning circuit also includes an air conditioning compressor 14, which compresses low-temperature gas into high-temperature, high-pressure gas. The rear end of air conditioning compressor 14 is connected to a pressure switch 11 and then to the air conditioning condenser 9, condensing the gas into a medium-temperature, high-pressure liquid. This process releases heat. The rear end of air conditioning condenser 9 is connected to a first expansion valve 4, which further cools the liquid into a low-temperature, low-pressure liquid mist. A chiller assembly 5 (a refrigerator) is connected to the rear end of first expansion valve 4. The low-temperature, low-pressure liquid mist evaporates in the chiller assembly 5 into a low-temperature, low-pressure gas. This process absorbs heat. The rear end of the chiller assembly 5 is connected to the air conditioning compressor 14, forming a cycle. To provide cooling for the battery thermal management circuit, the battery thermal management circuit is connected to the chiller assembly 5. During the evaporation of the low-temperature, low-pressure liquid mist into low-temperature, low-pressure gas, heat is absorbed from the battery thermal management circuit, thereby lowering the overall temperature of the antifreeze fluid in the battery thermal management circuit and achieving a cooling effect for the battery thermal management circuit. A second temperature sensor is provided on the air conditioning circuit. The second temperature sensor and the air conditioning compressor 14 are electrically connected to the microprocessor in the control device.

[0018] A first delivery pump 2 is connected to the battery thermal management circuit to circulate the refrigerant in the battery thermal management circuit. The first delivery pump 2 is arranged at the rear end of the refrigerator assembly 5. In order to incorporate the lithium-ion start-stop power supply into the battery thermal management circuit, the rear end of the first delivery pump 2 is connected in parallel with the first expansion kettle 3 and the electronic three-way valve 24. The first delivery pump 2 is connected to the third interface 2403 of the electronic three-way valve 24. The first interface 2401 of the electronic three-way valve 24 is connected to the lithium-ion start-stop power supply heat exchange pipeline 25. The rear end of the lithium-ion start-stop power supply heat exchange pipeline 25 is connected to the power battery assembly heat exchange pipeline 1. In order to achieve independent thermal management of the power battery assembly, the second interface 2402 of the electronic three-way valve 24 is connected to a parallel branch pipe. The rear end of the parallel branch pipe is connected between the lithium-ion start-stop power supply heat exchange pipeline 25 and the power battery assembly heat exchange pipeline 1. The rear end of the power battery assembly heat exchange pipeline 1 is connected to the refrigerator assembly 5 to form a loop. There is a third temperature sensor on the battery thermal management circuit. The third temperature sensor, the first delivery pump 2 and the electronic three-way valve 24 are all electrically connected to the microprocessor in the control device.

[0019] Thus, the battery thermal management loop is supplied with cold, further, in order to supply heat to the battery thermal management loop in winter, and in order to avoid the heat supply from consuming the power battery, a heating loop is introduced, a heat exchanger 27 is connected between the power battery assembly heat exchange pipe 1 and the refrigerator assembly 5, the heating loop comprises a liquid heater assembly 16, the anti-freezing liquid pipe of the heating loop passes through the liquid heater assembly 16, the oil inlet 21 of the liquid heater assembly 16 is connected with the outlet of the fourth delivery pump 20, and the inlet of the fourth delivery pump 20 is connected with the oil tank 22. There is a third delivery pump 15 on the heating loop, the rear end of the third delivery pump 15 is connected with the heat exchanger 27, and the heat exchanger 27 is connected with the warm air core assembly 23; the third expansion water pot 18 is connected in parallel between the heat exchanger 27 and the warm air core assembly 23; and the rear end of the warm air core assembly 23 is connected with the liquid heater assembly 16 to form a loop. The warm air core assembly 23 can supply heat to the air conditioner loop, the refrigerator assembly 5 of the air conditioner loop is connected in parallel with the evaporator assembly 19, the evaporator assembly 19 is connected in series with the second expansion valve 26 at the front end, the evaporator assembly 19 and the warm air core assembly 23 are located opposite to each other, and the evaporator assembly 19 and the warm air core assembly 23 jointly form the HVAC assembly 17. There is a fourth temperature sensor on the heating loop, and there is a liquid level sensor in the oil tank 22; the fourth temperature sensor, the liquid level sensor, the third delivery pump 15, the liquid heater assembly 16, the fourth delivery pump 20 and the fan on the warm air core assembly 23 are electrically connected with the microprocessor in the control device.

[0020] The working principle of the utility model is as follows:

[0021] For the charging thermal management loop, the second delivery pump 6 drives the anti-freezing liquid to flow, the anti-freezing liquid enters the radiator 8 through the OBC+DC module cooling pipe 10, the motor assembly cooling pipe 13 and the motor controller cooling pipe 12, and then forms a cycle in the OBC+DC module cooling pipe 10. When the temperature of the OBC+DC module, the motor controller and the motor assembly is higher than the set temperature, the fan of the radiator 8 starts to work and can be controlled by PWM according to the heat dissipation requirement to adjust the air volume; when the temperature decreases to the set temperature, the fan stops working.

[0022] For the air conditioner loop, when refrigerating, first, when the refrigeration switch is turned on, the fan of the HVAC assembly 17 is turned on, and the air conditioner compressor 14 starts to work; the refrigerant forms a high-temperature and high-pressure gas after passing through the air conditioner compressor 14; when the pressure reaches a certain value, the pressure switch 11 is opened; the high-temperature and high-pressure gas is condensed after passing through the air conditioner condenser 9, and forms a medium-temperature and high-pressure liquid; this process is exothermic; the rear end of the air conditioner condenser 9 is connected with the second expansion valve 26; the liquid is further cooled to a low-temperature and low-pressure liquid mist; the liquid mist enters the evaporator assembly 19; the HVAC fan of the HVAC assembly 17 promotes the heat exchange between the evaporator assembly 19 and the circulating air, so that the overall air temperature is reduced.

[0023] During heating, first, the fuel in the fuel tank 22 is delivered to the liquid heater assembly 16 through the fourth delivery pump 20 and combustion begins. The third delivery pump 15 circulates the antifreeze in the circuit, and the antifreeze is slowly heated. The heating switch is turned on, and the fan of the HVAC assembly 17 starts working. The heat generated by the combustion of the liquid heater assembly 16 is transferred to the cockpit through the antifreeze and the heater core assembly 23 for heating.

[0024] For the battery thermal management circuit, when the temperature of the power battery assembly is higher than the set value, the air-conditioning compressor 14 starts to work, and the refrigerant forms a high-temperature and high-pressure gas after passing through the air-conditioning compressor 14. After reaching a certain pressure, the pressure switch 11 opens, and it forms a liquid after passing through the air-conditioning condenser 9. The low-temperature liquid medium becomes a low-temperature and low-pressure liquid mist after passing through the first expansion valve 4. It exchanges heat with the antifreeze circulating in the power battery assembly heat exchange pipeline 1 through the refrigerator assembly 5 to reduce the temperature of the antifreeze. The antifreeze circulates through the first delivery pump 2 to reduce the temperature of the power battery assembly cell to achieve the purpose of lowering the cell temperature. When the cell temperature is lower than the set value, the refrigeration circuit is closed. If the cell temperature is higher, the refrigeration circuit is started again to achieve optimal management of the refrigeration circuit.

[0025] When the temperature of the power battery assembly is lower than the set value, the fuel in the fuel tank 22 is delivered to the liquid heater assembly 16 through the fourth delivery pump 20 and begins to burn. The third delivery pump 15 circulates the antifreeze in the circuit and slowly heats it. The heat generated by the combustion in the liquid heater assembly 16 is transferred to the antifreeze in the power battery assembly heat exchange pipeline 1 through the antifreeze and the heat exchanger 27. The antifreeze circulation is driven by the first delivery pump 2. The temperature of the antifreeze in the battery thermal management circuit rises, slowly heating the temperature of the battery cell. When the temperature reaches the set value, the heating circuit is turned off. If it is lower than the set value, it is turned on again.

[0026] When the temperature of the lithium-ion start-stop power supply is high or low, the electronic three-way valve 24 is controlled to connect the first interface 2401 and the third interface 2403, and the lithium-ion start-stop power supply heat exchange pipeline 25 is connected to the battery thermal management circuit, so that the lithium-ion start-stop power supply and the power battery assembly are thermally managed together. When the lithium-ion start-stop power supply does not require thermal management, but the power battery assembly requires thermal management, the electronic three-way valve 24 is controlled to connect the second interface 2402 and the third interface 2403, so that the lithium-ion start-stop power supply heat exchange pipeline 25 is disconnected from the battery thermal management circuit, thereby realizing independent thermal management of the power battery assembly.

[0027] The circuits and mechanical connections involved in the present invention are conventional means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and they belong to common knowledge.

[0028] Components not described in detail herein are prior art.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermal management system for a pure electric vehicle, comprising a charging thermal management circuit, an air conditioning circuit, a heating circuit, and a battery thermal management circuit, wherein the charging thermal management circuit comprises a radiator (8), the air conditioning circuit comprises an air conditioning condenser (9), and the radiator (8) and the air conditioning condenser (9) are positioned correspondingly; the air conditioning circuit and the battery thermal management circuit are both connected to a refrigerator assembly (5), and the heating circuit and the battery thermal management circuit are both connected to a heat exchanger (27), characterized in that: The battery thermal management circuit comprises a power battery assembly heat exchange pipeline (1) and a lithium ion start-stop power supply heat exchange pipeline (25); the front end of the lithium ion start-stop power supply heat exchange pipeline (25) is connected to a first interface (2401) of an electronic three-way valve (24), and the rear end is connected to the power battery assembly heat exchange pipeline (1); the second interface (2402) of the electronic three-way valve (24) is connected between the power battery assembly heat exchange pipeline (1) and the lithium ion start-stop power supply heat exchange pipeline (25) through a branch line; the third interface (2403) is connected to a first delivery pump (2); the first The front end of the delivery pump (2) is connected to the refrigerator assembly (5) and the heat exchanger (27), and then connected to the rear end of the power battery assembly heat exchange pipeline (1), forming a loop; the battery thermal management loop is also connected to a first expansion kettle (3); the air conditioning loop includes an evaporator assembly (19), and the heating loop includes a heater core assembly (23); the evaporator assembly (19) and the heater core assembly (23) are positioned correspondingly, and the two constitute a heating, ventilation and air conditioning assembly (17); and a control device is also included, and the electronic three-way valve (24) is electrically connected to the control device.

2. The thermal management system for a pure electric vehicle according to claim 1, characterized in that: The charging thermal management loop also includes an OBC+DC module cooling pipeline (10), the rear end of the OBC+DC module cooling pipeline (10) is connected to a second delivery pump (6), the rear end of the second delivery pump (6) is connected to the cooling pipelines of the motor assembly cooling pipeline (13) and the motor controller cooling pipeline (12), the rear end of the motor controller cooling pipeline (12) is connected to the radiator (8) and then connected to the front end of the OBC+DC module cooling pipeline (10), forming a loop; a second expansion kettle (7) is provided between the OBC+DC module cooling pipeline (10) and the second delivery pump (6).

3. The thermal management system for a pure electric vehicle according to claim 1, characterized in that: The air-conditioning circuit also includes an air-conditioning compressor (14), the rear end of the air-conditioning compressor (14) is connected to the pressure switch (11) and then to the air-conditioning condenser (9), the rear end of the air-conditioning condenser (9) is connected to the first port of the three-way pipe fitting, the second port of the three-way pipe fitting is connected to the first expansion valve (4), and the third port is connected to the second expansion valve (26), the rear end of the second expansion valve (26) is connected to the evaporator assembly (19), and then to the air-conditioning compressor (14), forming a circuit; the first expansion valve (4) is connected to the refrigerator assembly (5), and then connected between the evaporator assembly (19) and the air-conditioning compressor (14).

4. The thermal management system for a pure electric vehicle according to claim 1, characterized in that: The heating circuit also includes a liquid heater assembly (16). The antifreeze pipeline of the heating circuit passes through the liquid heater assembly (16) and is then connected to the third delivery pump (15). The third delivery pump (15) is connected to the heat exchanger (27) and then to the heater core assembly (23). The heater core assembly (23) is connected to the liquid heater assembly (16) to form a circuit. The front end of the heater core assembly (23) is connected to the third expansion kettle (18). The oil inlet (21) of the liquid heater assembly (16) is connected to the fourth delivery pump (20), and the fourth delivery pump (20) is connected to the oil tank (22).

5. The thermal management system for a pure electric vehicle according to claim 1, characterized in that: The first expansion kettle (3) is arranged between the first delivery pump (2) and the third interface (2403) of the electronic three-way valve (24).

6. A vehicle, characterized in that: The vehicle is a pure electric vehicle, comprising the pure electric vehicle thermal management system according to any one of claims 1 to 5.

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