A whole vehicle thermal management system for electric vehicle fast charging

Abstract

The application provides a whole vehicle thermal management system for battery fast charging of an electric vehicle, comprising an air conditioning system or a heat pump system, a battery thermal management system and a motor electric control cooling system, the whole vehicle thermal management system contains two sets of compression refrigeration systems, which are respectively used for passenger cabin refrigeration and battery refrigeration. When the battery is in a fast charging state, the two sets of compression refrigeration systems are all used for cooling the battery, which not only increases the range of selection of the compressor and the expansion valve type, but also enables the compressor / expansion valve to be more accurately controlled and to be in the most suitable working interval. The heat of the motor electric control cooling circuit is transmitted to the battery thermal management circuit through a water-water heat exchanger, which can be used for heating the battery and can also be used as a heat source of the heat pump system to heat the passenger cabin, and the switching of the air conditioning system and the heat pump state relies on the on-off of the electromagnetic valve, so that the heat of the motor electric control system is utilized, the large power consumption caused by the pure PTC heating of the passenger cabin or the battery in winter is reduced, and the cruising range of the electric commercial vehicle in winter is increased.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more particularly to a vehicle thermal management system for fast battery charging in electric vehicles. Background Technology

[0002] The market share of pure electric vehicles has increased significantly in recent years. However, the driving range of pure electric vehicles remains a major challenge. Currently, many manufacturers are trying to alleviate this problem by continuously increasing battery capacity. However, this has led to issues such as long charging times for large-capacity batteries or the use of fast charging technology resulting in excessive heat generation that cannot be quickly cooled. In addition, electric vehicles have low range in winter, with some electricity being consumed by electric heaters to warm the passenger compartment and the battery. The heat from the motor and electronic control system is often directly dissipated into the external environment, resulting in low overall heat utilization efficiency. Furthermore, the independent thermal management systems within the vehicle further reduce energy efficiency.

[0003] To address the aforementioned issues and meet the cooling requirements during fast battery charging, it's not simply a matter of increasing the power of individual components. Instead, a holistic approach is needed, rationally planning the components of each system and comprehensively utilizing the vehicle's heat resources to shorten charging time and improve overall heat utilization. Therefore, a comprehensive thermal management system for electric vehicles specifically designed for fast battery charging is urgently needed. Summary of the Invention

[0004] This application provides a vehicle thermal management system for fast battery charging of electric vehicles, which solves the technical problem that existing electric vehicle thermal management systems cannot comprehensively utilize the heat of the entire vehicle.

[0005] This application provides a vehicle thermal management system for fast battery charging in electric vehicles. The system includes an air conditioning system or a heat pump system, a battery thermal management system, and a motor electronic control cooling system; wherein the air conditioning system or the heat pump system includes a first compressor (…). Figure 1 The compressor 1), the first solenoid valve ( Figure 1 Solenoid valve 2), first water-cooled condenser ( Figure 1 The water-cooled condenser 1) and the first electronic expansion valve ( Figure 1 The electronic expansion valve 1), evaporator, and second solenoid valve (in the middle) Figure 1 Solenoid valve 3), heat pump heating core, second electronic expansion valve ( Figure 1 The electronic expansion valve 2) and the first chiiller ( Figure 1 The chiller 1), gas-liquid separator, and second water-cooled condenser (in the middle) Figure 1 Water-cooled condenser 2), condenser radiator, first water pump ( Figure 1 2) Water pump in the middle, first expansion tank ( Figure 1a third solenoid valve (1) in the battery thermal management system, the first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, Figure 1 a first chiller, a second chiller (2) in the air conditioning system, a water-water heat exchanger, a first three-way valve (1) in the air conditioning system, Figure 1 a water-water heat exchanger, a first three-way valve (1) in the air conditioning system, Figure 1 a water-water heat exchanger, a first three-way valve (1) in the air conditioning system, Figure 1 a water-water heat exchanger, a first three-way valve (1) in the air conditioning system, Figure 1 a water-water heat exchanger, a first three-way valve (1) in the air conditioning system.

[0006] In an implementation form of the present application, when the battery needs to be cooled in the fast charging mode, the compression refrigeration components of the air conditioning system can be used for battery cooling, realizing that two sets of compression refrigeration systems are used for battery cooling.

[0007] In an implementation form of the present application, the first solenoid valve, the second solenoid valve, the third solenoid valve, the first electronic expansion valve, the second electronic expansion valve, and the third electronic expansion valve are used to switch the air conditioning system and the heat pump system, so as to facilitate the air conditioning system to cool the passenger compartment or cool the battery in the fast charging mode.

[0008] In an implementation form of the present application, the first chiller couples the air conditioning system and the battery thermal management system, and when the battery is fast charging, the cold energy of the air conditioning system is transferred to the cooling liquid of the battery thermal management system through the first chiller, so as to cool the battery.

[0009] In an implementation form of the present application, the water-water heat exchanger is used to couple the battery thermal management system and the motor electronic control cooling system, and the heat of the motor electronic control system is transferred to the cooling liquid of the battery thermal management system through the water-water heat exchanger, so as to heat the battery or serve as a heat source of the heat pump system.

[0010] In an implementation form of the present application, the first water-cooled condenser and the second water-cooled condenser transfer the heat of the air conditioning system and the heat of the battery thermal management system to the cooling liquid, and dissipate to the external environment through the water-cooled radiator.

[0011] In an implementation form of the present application, the first three-way valve is a one-bit two-way on-off three-way valve, which is used to realize the switching of battery cooling, self-circulation, heating or battery shutdown.

[0012] In an implementation form of the present application, the second three-way valve is a one-bit two-way on-off three-way valve, which is used to realize the heat transfer of the motor electronic control loop to the battery thermal management system or the motor electronic control cooling liquid for self-circulation or flowing through the low-temperature radiator for heat dissipation.

[0013] In an implementation form of the present application, the heating water PTC is used to heat the cooling liquid to heat the battery or as a heat source for heat absorption of the heat pump system.

[0014] In an implementation form of the present application, in the air conditioning system or the heat pump system, a gas-liquid separator is arranged in front of the compressor inlet pipe.

[0015] The whole vehicle thermal management system for battery fast charging of an electric vehicle provided by the present application can realize the heat dissipation demand in the battery fast charging state, and the refrigeration system can also be in a suitable working interval when the battery is discharging, thereby avoiding the selection of a larger refrigeration system due to the consideration of the heat dissipation demand in the battery fast charging, and saving the cost. Through the regulation and control of the electromagnetic valve, the switching of the air conditioning system and the heat pump system is realized, and the heat of the motor electronic control cooling system is used as the heat source of the heat pump, thereby reasonably utilizing the whole vehicle energy and improving the cruising range of the electric commercial vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 2 The whole vehicle thermal management system for battery fast charging of an electric vehicle provided by the present application is shown in a component block diagram;

[0018] Figure 3 The schematic diagram of the components responding to the battery fast charging mode provided by the present application is shown;

[0019] Figure 4 The schematic diagram of the components responding to the summer driving provided by the present application is shown;

[0020] Figure 5 The schematic diagram of the components responding to the winter driving provided by the present application is shown;

[0021] Figure 1 A schematic view of components responding to winter parking of the present application is provided. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] The present application provides a whole vehicle thermal management system for electric vehicle fast charging, to solve the technical problem that the existing electric vehicle thermal management system cannot comprehensively utilize the heat of the whole vehicle.

[0024] The technical solutions proposed by the present application will be described in detail below with the help of drawings.

[0025] Figure 1 A block diagram of a whole vehicle thermal management system for electric vehicle fast charging provided by the present application is provided. The system mainly includes an air conditioning system or a heat pump system, a battery thermal management system and a motor electric control cooling system.

[0026] The air conditioning system or the heat pump system comprises a compressor 1, a solenoid valve 2, a water-cooled condenser 1, an electronic expansion valve 1, an evaporator, a solenoid valve 3, a heat pump heater core, an electronic expansion valve 2, a chiller 1, a gas-liquid separator, a water-cooled condenser 2, a condenser radiator, a water pump 2 and an expansion tank 2.

[0027] The components of the air conditioning system / heat pump system on the refrigerant side are connected as follows: the output port of the compressor 1 is connected to the three-way junction 1, the other two ends of the three-way junction 1 are respectively connected to the input port of the electromagnetic valve 2 and the input port of the electromagnetic valve 3, the output port of the electromagnetic valve 2 is connected to one end of the water-cooled condenser 1 on the refrigerant side, the other end of the water-cooled condenser 1 on the refrigerant side is connected to the three-way junction 2, one end of the three-way junction 2 is connected to the input port of the electronic expansion valve 1, the output port of the electronic expansion valve 1 is connected to one end of the evaporator, the other end of the evaporator is connected to the three-way junction 4, one end of the three-way junction 2 is connected to one end of the three-way junction 3, one end of the three-way junction 3 is connected to the input port of the electronic expansion valve 2, the output port of the electronic expansion valve 2 is connected to the input port of the chiller 2 on the refrigerant side, the output port of the chiller 2 on the refrigerant side is connected to the three-way junction 4, one end of the three-way junction 4 is connected to the input port of the gas-liquid separator, the output port of the gas-liquid separator is connected to the input port of the compressor 1, the output port of the electromagnetic valve 3 is connected to one end of the heat pump heater core, the other end of the heat pump heater core is connected to the three-way junction 3. The components on the cooling liquid side are connected as follows: the output port of the water pump 2 is connected to the three-way junction 6, one end of the three-way junction 6 is connected to one end of the water-cooled condenser 1 on the cooling liquid side, the other end of the water-cooled condenser 1 on the cooling liquid side is connected to the three-way junction 5, one end of the three-way junction 5 is connected to one end of the condenser radiator, the other end of the condenser radiator is connected to the input port of the water pump 2, one end of the three-way junction 6 is connected to one end of the water-cooled condenser 2 on the cooling liquid side, the other end of the water-cooled condenser 2 on the cooling liquid side is connected to the three-way junction 5.

[0028] The battery thermal management system comprises: a liquid-cooled battery, a heating water PTC, an electromagnetic valve 1, a chiller 1, a chiller 2, a compressor 2, a water-cooled condenser 2, an electronic expansion valve 3, a condenser radiator, a water pump 2, an expansion tank 2, a water-cooled condenser 1, an electronic expansion valve 2, a gas-liquid separator, a compressor 1, an electromagnetic valve 2, a water pump 1, an expansion tank 1, a water-water heat exchanger, and a three-way valve 1.

[0029] The components of the battery thermal management system refrigerant side are connected as follows: the output port of the compressor 2 is connected to one end of the water-cooled condenser 2 refrigerant side, the other end of the water-cooled condenser 2 refrigerant side is connected to the input port of the electronic expansion valve 3, the output port of the electronic expansion valve 3 is connected to the input port of the chiller 2 refrigerant side, and the output port of the chiller 2 refrigerant side is connected to the input port of the compressor 2. The components of the battery thermal management system cooling liquid side are connected as follows: the output port of the liquid-cooled battery is connected to the three-way junction 9, one end of the three-way junction 9 is connected to the input port of the heated water PTC, the output port of the heated water PTC is connected to the three-way junction 7, the other two ends of the three-way junction 7 are respectively connected to the input port of the electromagnetic valve 1 and the input port of the chiller 2 cooling liquid side, the output port of the electromagnetic valve 1 is connected to the input port of the chiller 1 cooling liquid side, the output port of the chiller 1 cooling liquid side is connected to the three-way junction 8, the output port of the chiller 2 cooling liquid side is connected to the three-way junction 8, one end of the three-way junction 8 is connected to the input port of the water pump 1, the output port of the water pump 1 is connected to the input port of the water-water heat exchanger cooling liquid I side, the output port of the water-water heat exchanger cooling liquid I side is connected to the input port A of the three-way valve 1, the output port B of the three-way valve 1 is connected to the input port of the liquid-cooled battery, and the output port C of the three-way valve 1 is connected to the three-way junction 9.

[0030] The motor electric control cooling system mainly includes: motor electric control, water pump 3, expansion tank 3, proportional three-way valve, low-temperature radiator, three-way valve 2, and water-water heat exchanger.

[0031] The components of the motor electric control cooling system are connected as follows: the output port of the motor electric control is connected to the input port of the water pump 3, the output port of the water pump 3 is connected to the input port A of the proportional three-way valve, the output port B of the proportional three-way valve is connected to one end of the low-temperature radiator, the other end of the low-temperature radiator is connected to the three-way junction 11, the output port C of the proportional three-way valve is connected to the three-way junction 11, one end of the three-way junction 11 is connected to the input port A of the three-way valve, the output port B of the three-way valve is connected to the input port of the water-water heat exchanger cooling liquid II side, the output port of the water-water heat exchanger cooling liquid II side is connected to the three-way junction 10, and the other two sides of the three-way junction 10 are respectively connected to the output port C of the three-way valve 2 and the input port of the motor electric control.

[0032] In the present application, when the battery needs to be cooled in the fast charging mode, the compression refrigeration components of the air conditioning system can be used for battery cooling, realizing that two sets of compression refrigeration systems are used for battery cooling.

[0033] In the present application, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the first electronic expansion valve, the second electronic expansion valve, and the third electronic expansion valve are used to switch the air conditioning system and the heat pump system, so as to facilitate the air conditioning system to cool the passenger compartment or to cool when the battery is fast charging.

[0034] In the application, the first chiller couples the air conditioning system with the battery thermal management system, and the cold energy of the air conditioning system is transferred to the cooling liquid of the battery thermal management system through the first chiller to cool the battery when the battery is fast-charged.

[0035] In the application, the water-water heat exchanger is used to couple the battery thermal management system with the motor electronic control cooling system, and the heat of the motor electronic control system is transferred to the cooling liquid of the battery thermal management system through the water-water heat exchanger to heat the battery or as a heat source of a heat pump system.

[0036] In the application, the first water-cooled condenser and the second water-cooled condenser transfer the heat of the air conditioning system and the heat of the battery thermal management system to the cooling liquid, which is dissipated to the external environment through a water-cooled radiator.

[0037] In the application, the first three-way valve is a one-position two-way on-off three-way valve, which is used to switch between battery cooling, self-circulation, heating or battery shutdown.

[0038] In the application, the second three-way valve is a one-position two-way on-off three-way valve, which is used to transfer the heat of the motor electronic control loop to the battery thermal management system or the motor electronic control cooling liquid for self-circulation or flowing through a low-temperature radiator for heat dissipation.

[0039] In the application, the heating water PTC is used to heat the cooling liquid to heat the battery or as a heat source for heat absorption of a heat pump system.

[0040] In the application, a gas-liquid separator is arranged in front of the compressor inlet pipe in the air conditioning system or the heat pump system.

[0041] In the application, the proportional three-way valve can adjust the flow distribution size of two channels, which can not only make part of the cooling liquid go to the battery thermal management loop, but also avoid the temperature of the cooling liquid of the motor electronic control loop being too high to affect the normal work of the motor electronic control system.

[0042] It should be noted that the battery contains multiple blocks, and the cooling pipeline is connected in series and in parallel, and the battery input / output in the description refers to the input / output of the main cooling liquid pipeline. Similarly, the motor electronic control cooling pipeline is connected in series and in parallel, and the motor electronic control input / output in the description refers to the input / output of the main cooling liquid pipeline. Figure 2 The positional relationship of each part shown is only an example for illustration, and does not represent the actual installation orientation and sequence.

[0043] The following will take the drawings as an example to specifically describe the embodiments of the application.

[0044] Embodiment 1

[0045] In the embodiments of the present application, Figure 2 An example shows the working condition of the battery fast charging mode, and the battery is cooled. Figure 3 In the working condition, the electromagnetic valve 1 is opened, the electromagnetic valve 2 is opened, the electromagnetic valve 3 is closed, the electronic expansion valve 1 is closed, the electronic expansion valve 2 and the electronic expansion valve 3 are adjusted according to the demand, and the three-way valve AB is connected. The heat of the battery thermal management system is transferred to the refrigerant side through the chiller, then to the cooling liquid side through the water-water heat exchanger, and finally to the outside environment through the condensing radiator. The cooling liquid of the battery thermal management system is cooled by two sets of compression refrigeration systems. One cooling liquid flow path is: liquid-cooled battery -> heating water PTC -> chiller 2 -> water pump 1 -> water-water heat exchanger -> three-way valve 1 -> liquid-cooled battery, and the refrigerant flow path for cooling this path is: compressor 2 -> water-cooled condenser 2 -> electronic expansion valve 3 -> chiller 2 -> compressor 2. The other cooling liquid flow path is: liquid-cooled battery -> heating water PTC -> electromagnetic valve 1 -> chiller 1 -> water pump 1 -> water-water heat exchanger -> three-way valve 1 -> liquid-cooled battery, and the refrigerant flow path for cooling this path is: compressor 1 -> electromagnetic valve 2 -> water-cooled condenser 1 -> electronic expansion valve 2 -> chiller 1 -> gas-liquid separator -> compressor 1. The cooling liquid flow path for cooling the two refrigerant paths is: water pump 2 -> water-cooled condenser 1 / water-cooled condenser 2 -> condensing radiator -> water pump 2.

[0046] Embodiment 2

[0047] In the embodiments of the present application, Figure 3 An example shows the working condition of summer driving, the passenger compartment needs to be refrigerated, the battery needs to be cooled, and the motor control is cooled by the low-temperature radiator. Figure 4 In the working condition, the electromagnetic valve 1 is closed, the electromagnetic valve 2 is opened, the electromagnetic valve 3 is closed, the electronic expansion valve 2 is closed, the electronic expansion valve 1 and the electronic expansion valve 3 are adjusted according to the demand, and the three-way valve 1 AB is connected. At this time, two sets of compression refrigeration circuits are used to cool the battery and the passenger compartment. The heat of the battery thermal management system is transferred to the refrigerant side through the chiller 2, the heat of the passenger compartment is transferred to the refrigerant side through the evaporator, the heat of the refrigerant side is transferred to the cooling liquid circuit through the water-cooled condenser, and finally dissipated to the outside environment through the condensing radiator. When the battery is cooled, the cooling liquid flow path is: liquid-cooled battery -> heating water PTC -> chiller 2 -> water pump 1 -> water-water heat exchanger -> three-way valve 1 -> liquid-cooled battery, and the refrigerant flow path for cooling this path is: compressor 2 -> water-cooled condenser 2 -> electronic expansion valve 3 -> chiller 2 -> compressor 2. When the passenger compartment is refrigerated, the refrigerant flow path is: compressor 1 -> electromagnetic valve 2 -> water-cooled condenser 1 -> electronic expansion valve 1 -> evaporator -> gas-liquid separator -> compressor 1. The cooling liquid flow path for cooling the refrigerant is: water pump 2 -> water-cooled condenser 1 / water-cooled condenser 2 -> condensing radiator -> water pump 2.

[0048] Embodiment 3

[0049] In the embodiments of the present application, Figure 4 The example shows the winter driving condition, and the heat pump system indirectly absorbs the heat of the motor electronic control loop to heat the passenger cabin and heat the battery. Figure 5 In the working condition, the electromagnetic valve 1 is opened, the electromagnetic valve 2 is closed, the electromagnetic valve 3 is opened, the proportional three-way valve AC is connected, the three-way valve 2AB is connected, the three-way valve 1AB is connected, and the cooling liquid of the battery thermal management system flows in the following direction: liquid-cooled battery→heating water PTC→chiller 2 / (electromagnetic valve 1→chiller 1)→water pump 1→water-water heat exchanger→three-way valve 1→liquid-cooled battery, and the cooling liquid of the motor electronic control cooling system flows in the following direction: motor electronic control→water pump 3→proportional three-way valve→three-way valve 2→water-water heat exchanger→motor electronic control. The refrigerant of the heat pump system flows in the following direction: compressor 1→electromagnetic valve 3→heat pump heater core→electronic expansion valve 2→chiller 1→gas-liquid separator→compressor 1.

[0050] Embodiment 4

[0051] In the embodiments of the present application, Figure 5 The example shows the winter parking condition, and the heat pump system absorbs the heat of the water PTC heated cooling liquid to heat the passenger cabin. ​ In the working condition, the electromagnetic valve 1 is opened, the electromagnetic valve 2 is closed, the electromagnetic valve 3 is opened, the three-way valve 1AC is connected, and the refrigerant of the heat pump system flows in the following direction: compressor 1→electromagnetic valve 3→heat pump heater core→electronic expansion valve 2→chiller 1→gas-liquid separator→compressor 1. The cooling liquid of the battery thermal management system flows in the following direction: water pump 1→water-water heat exchanger→three-way valve 1→heating water PTC→chiller 2 / (electromagnetic valve 1→chiller 1)→water pump 1.

[0052] The whole vehicle thermal management system for battery fast charging provided in the present application can meet the heat dissipation demand in the battery fast charging state, and the refrigeration system can also be in a suitable working interval when the battery is discharging, thereby avoiding the selection of a larger refrigeration system considering the heat dissipation demand in the battery fast charging, and saving the cost. Through the regulation and control of the electromagnetic valve, the switching of the air conditioning system and the heat pump system is realized, and the heat of the motor electronic control cooling system is used as the heat source of the heat pump, thereby reasonably utilizing the whole vehicle energy and improving the cruising range of the electric commercial vehicle.

[0053] The same and similar parts among the various embodiments in the present application can be referred to each other, and each embodiment mainly describes the difference from other embodiments. Especially, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the related parts can be referred to the part of the method embodiments.

[0054] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0055] The above description is merely illustrative of the application, and not restrictive. Various modifications and changes can become apparent to those skilled in the art. Incorporating any modification, equivalent substitution, improvement, etc. within the spirit and principle of the application, shall be included in the scope of the claims of the application.

Claims

1. A thermal management system for electric vehicles used in fast battery charging, characterized in that, The system includes an air conditioning system or a heat pump system, a battery thermal management system, and a motor electronic control cooling system; wherein, the air conditioning system or the heat pump system includes a first compressor, a first solenoid valve, a first water-cooled condenser, a first electronic expansion valve, an evaporator, a second solenoid valve, a heat pump heating core, a second electronic expansion valve, a first chiller, a gas-liquid separator, a second water-cooled condenser, a condenser radiator, a first water pump, and a first expansion tank; the battery thermal management system includes a liquid-cooled battery, a heating water PTC, a third solenoid valve, the first chiller, the second chiller, a second compressor, the second water-cooled condenser, the third electronic expansion valve, the condenser radiator, and the... The system comprises a first water pump, a first expansion tank, a first water-cooled condenser, a second electronic expansion valve, a gas-liquid separator, a first compressor, a first solenoid valve, a second water pump, a second expansion tank, a water-to-water heat exchanger, and a first three-way valve. The motor-controlled cooling system includes a motor control unit, a third water pump, a third expansion tank, a proportional three-way valve, a low-temperature radiator, a second three-way valve, and the water-to-water heat exchanger. The output port of the heating water PTC is connected to the first three-way junction (7), and the other two ends of the first three-way junction (7) are respectively connected to the input port of the third solenoid valve and the input port of the second chiller coolant side. The output port of the third solenoid valve is connected to the first chiller coolant side. The input port of the first chiller is connected to the output port of the first chiller coolant side, which is connected to the second three-way junction (8). One end of the second three-way junction (8) is connected to the input port of the second water pump. The water-to-water heat exchanger is used to couple the battery thermal management system with the motor electronic control cooling system. The heat from the motor electronic control cooling system is transferred to the coolant of the battery thermal management system through the water-to-water heat exchanger to heat the battery or serve as a heat source for the heat pump system. The output port of the second water pump is connected to the input port of the water-to-water heat exchanger on the coolant side I, and the output port of the water-to-water heat exchanger on the coolant side I is connected to the input port of the first three-way valve. The input port A is connected, the output port B of the first three-way valve is connected to the input port of the coolant II side of the water-to-water heat exchanger, and the output port of the coolant II side of the water-to-water heat exchanger is connected to the third three-way node (10); the output port of the third water pump is connected to the input port A of the proportional three-way valve, the output port B of the proportional three-way valve is connected to one end of the low-temperature radiator, the other end of the low-temperature radiator is connected to the fourth three-way node (11), and the output port C of the proportional three-way valve is connected to the fourth three-way node (11); the proportional three-way valve can adjust the flow distribution of the two channels, which can both allow a portion of the coolant to heat the battery thermal management circuit and prevent the coolant temperature of the motor control circuit from being too high, thus affecting the normal operation of the motor control cooling system.

2. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, When heat dissipation is required in the battery fast charging mode, the compression refrigeration component of the air conditioning system can be used to cool the battery, thus enabling two compression refrigeration systems to cool the battery.

3. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The first solenoid valve, the second solenoid valve, the third solenoid valve, the first electronic expansion valve, the second electronic expansion valve, and the third electronic expansion valve are used to switch between the air conditioning system and the heat pump system, so as to facilitate the air conditioning system to cool the passenger compartment or the battery during fast charging.

4. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The first chiller couples the air conditioning system to the battery thermal management system. During battery fast charging, the first chiller transfers the cooling energy of the air conditioning system to the coolant in the battery thermal management system to cool the battery.

5. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The first and second water-cooled condensers transfer the heat from the air conditioning system and the battery thermal management system to the coolant, which is then dissipated to the external environment through the water-cooled radiator.

6. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The first three-way valve is a one-position two-way on / off three-way valve, used to switch between battery cooling, self-circulation, heating, or battery shutdown.

7. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The second three-way valve is a one-position two-way on / off three-way valve, used to transfer heat from the motor control circuit to the battery thermal management system or for the motor control coolant to circulate or flow through a low-temperature radiator for heat dissipation.

8. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, The heated water PTC is used to heat the coolant to heat the battery or as a heat source for the heat pump system.

9. The electric vehicle thermal management system for fast battery charging according to claim 1, characterized in that, In the air conditioning system or the heat pump system, a gas-liquid separator is arranged before the inlet pipe of the first compressor.

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