Electric vehicle cooling system and electric vehicle

Abstract

The present invention discloses an electric vehicle cooling system and electric vehicle, belonging to the field of vehicle technology. The cooling system includes a drive assembly cooling unit, an air conditioning cooling unit, a battery cooling unit, and a radiator unit. The drive assembly cooling unit includes an external drive assembly cooling water circuit, a water-cooled condenser, a three-way valve assembly, and a built-in drive assembly cooling water circuit connected thereto. The water-cooled condenser is connected to the air conditioning cooling unit via a refrigerant channel, which is in turn connected to the three-way valve assembly via a water channel. The three-way valve assembly is also connected to the radiator unit. The battery cooling unit includes a plate heat exchanger and a built-in battery pack cooling water circuit. The plate heat exchanger is connected to the air conditioning cooling unit via its refrigerant channel, which is in turn connected to the built-in battery pack cooling water circuit via a water channel. The three-way valve assembly enables the built-in drive assembly cooling water circuit and the water-cooled condenser to switch between series and parallel modes. The cooling mode is selected based on the actual vehicle conditions to reduce energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to an electric vehicle cooling system and an electric vehicle. Background Art

[0002] Electric vehicles typically use drive assembly cooling water circuits to cool the vehicle control and drive assembly, such as the drive motor and motor controller, and use air conditioning cooling circuits to dissipate heat from the interior of the cabin.

[0003] In related technology, a water-cooled condenser is installed in the drive assembly cooling water circuit to replace the condenser in the air conditioning cooling circuit, and both share a radiator. There are two layout configurations for the water-cooled condenser and the drive assembly's internal cooling water circuit: a parallel arrangement, where the coolant flows from the radiator and simultaneously passes through the drive assembly's internal cooling water circuit and the water-cooled condenser; and a series arrangement, where the coolant flows from the radiator and then sequentially passes through the drive assembly's internal cooling water circuit and the water-cooled condenser.

[0004] The cooling system of the electric vehicle provided by the related art is either a single series mode or a single parallel mode, which will result in the electric vehicle being unable to increase energy consumption in certain vehicle conditions. Summary of the Invention

[0005] In view of this, the present invention provides an electric vehicle cooling system and an electric vehicle, which can solve the technical problems existing in the related art.

[0006] Specifically, the following technical solutions are included:

[0007] On the one hand, an embodiment of the present invention provides an electric vehicle cooling system, the electric vehicle cooling system comprising: a drive assembly cooling unit, an air conditioning cooling unit, a battery cooling unit, and a radiator unit;

[0008] The drive assembly cooling unit includes: an external cooling water circuit for the drive assembly, a water-cooled condenser, a three-way valve assembly, and an internal cooling water circuit for the drive assembly disposed in the vehicle control and drive assembly, wherein the water-cooled condenser, the three-way valve assembly, and the internal cooling water circuit for the drive assembly are all connected to the external cooling water circuit for the drive assembly;

[0009] The water-cooled condenser has a refrigerant channel and a water channel. The water-cooled condenser is connected to the air-conditioning cooling unit via its refrigerant channel. The water-cooled condenser is connected to the three-way valve assembly via its water channel. The three-way valve assembly is also connected to the radiator unit.

[0010] The battery cooling unit includes: a plate heat exchanger and a battery pack built-in cooling water channel provided in the power battery pack, the plate heat exchanger having a refrigerant channel and a water channel, the plate heat exchanger being connected to the air conditioning cooling unit via its refrigerant channel, and the plate heat exchanger being connected to the battery pack built-in cooling water channel via its water channel;

[0011] The three-way valve assembly is configured to enable the built-in cooling water path of the drive assembly and the water-cooled condenser to switch between a series mode and a parallel mode.

[0012] In some possible implementations, the three-way valve assembly includes: a first three-way valve, a fourth three-way valve, a fifth three-way valve, and a sixth three-way valve;

[0013] The first interface of the first three-way valve is connected to one end of the radiator unit, the second interface of the first three-way valve is connected to the second interface of the sixth three-way valve, and the third interface of the first three-way valve is connected to one end of the built-in cooling water circuit of the drive assembly;

[0014] The first interface of the fifth three-way valve is connected to the other end of the built-in cooling water circuit of the drive assembly, the second interface of the fifth three-way valve is connected to the third interface of the sixth three-way valve, and the first interface of the sixth three-way valve is connected to one end of the water channel of the water-cooled condenser;

[0015] The third interface of the fifth three-way valve is connected to the third interface of the fourth three-way valve, the second interface of the fourth three-way valve is connected to the other end of the water channel of the water-cooled condenser, and the first interface of the fourth three-way valve is connected to the other end of the radiator unit.

[0016] In some possible implementations, the drive assembly cooling unit further includes a second three-way valve and a third three-way valve;

[0017] The first interface of the second three-way valve is connected to the third interface of the first three-way valve, and the second interface and the third interface of the second three-way valve are both connected to one end of the built-in cooling water circuit of the drive assembly;

[0018] The first interface of the third three-way valve is connected to the first interface of the fifth three-way valve, and the second interface and the third interface of the third three-way valve are both connected to the other end of the built-in cooling water circuit of the drive assembly.

[0019] In some possible implementations, the drive assembly cooling unit further includes: a second water pump and a third water pump;

[0020] The second water pump is located on the external cooling water path of the drive assembly between the first interface of the sixth three-way valve and the water-cooled condenser;

[0021] The third water pump is located on the external cooling water path of the drive assembly between the third interface of the first three-way valve and the first interface of the second three-way valve.

[0022] In some possible implementations, the battery cooling unit further includes a first water pump;

[0023] The water channel of the plate heat exchanger, the first water pump, and the built-in cooling water channel of the battery pack are sequentially connected in a closed loop.

[0024] In some possible implementations, the plate heat exchanger is a Chiller heat exchanger.

[0025] In some possible implementations, the air conditioning cooling unit includes a compressor, an evaporator, a blower, a thermal expansion valve, and an electronic expansion valve;

[0026] The refrigerant channels of the compressor and the water-cooled condenser are sequentially connected in series to the first air-conditioning external cooling circuit;

[0027] The first end of the first air-conditioning external cooling circuit is divided into two paths, one path is connected to the first end of the second air-conditioning external cooling circuit, and the other path is connected to the first end of the third air-conditioning external cooling circuit;

[0028] The second end of the second air-conditioning external cooling circuit and the second end of the third air-conditioning external cooling circuit merge and are connected to the second end of the first air-conditioning external cooling circuit;

[0029] The electronic expansion valve and the refrigerant channel of the plate heat exchanger are sequentially connected in series to the second air conditioner external cooling circuit along the refrigerant flow direction;

[0030] The thermal expansion valve and the evaporator are sequentially connected in series to the third air-conditioning external cooling circuit along the refrigerant flow direction, and the blower is arranged facing the evaporator.

[0031] In some possible implementations, the radiator unit includes an external cooling water circuit for the radiator, a radiator, and a fan;

[0032] One end of the external cooling water circuit of the radiator is connected to the first interface of the first three-way valve, and the other end of the external cooling water circuit of the radiator is connected to the first interface of the fourth three-way valve;

[0033] The radiator is connected to the external cooling water channel of the radiator, and the fan is arranged facing the radiator.

[0034] On the other hand, an embodiment of the present invention further provides an electric vehicle, which includes any one of the above-mentioned electric vehicle cooling systems.

[0035] In some possible implementations, the electric vehicle includes a control system, and the control system is electrically connected to the three-way valve assembly;

[0036] The control system is configured to:

[0037] Acquiring a current vehicle condition and determining a cooling method that matches the current vehicle condition, wherein the cooling method includes: a series connection of a cooling water path built into the drive assembly and the water-cooled condenser, and a parallel connection of the cooling water path built into the drive assembly and the water-cooled condenser;

[0038] According to the confirmed cooling mode, the operation of the three-way valve assembly is controlled to switch the electric vehicle cooling system to the series mode or the parallel mode.

[0039] The beneficial effects of the technical solution provided by the embodiment of the present invention include at least:

[0040] The electric vehicle cooling system provided by an embodiment of the present invention connects a water-cooled condenser to an air conditioning cooling unit through its refrigerant channel, and provides a three-way valve assembly in the drive assembly cooling unit. The three-way valve assembly is used to switch the drive assembly's built-in cooling water circuit and the water-cooled condenser between series mode and parallel mode. This allows the electric vehicle cooling system to have both series and parallel modes, and to select a cooling method that matches the actual operating conditions of the electric vehicle. For example, in parking conditions, a cooling method based on the series mode is selected, and in driving conditions, a cooling method based on the parallel mode is selected. Compared to cooling systems that only have a single series mode or parallel mode, the electric vehicle cooling system provided by an embodiment of the present invention has flexibility and can select a cooling mode based on the actual operating conditions of the electric vehicle, which helps reduce the energy consumption of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic structural diagram of an exemplary electric vehicle cooling system provided by an embodiment of the present invention;

[0043] Figure 2 A schematic structural diagram of an exemplary electric vehicle cooling system in series connection according to an embodiment of the present invention;

[0044] Figure 3A schematic structural diagram of an exemplary electric vehicle cooling system in parallel state provided by an embodiment of the present invention.

[0045] in, Figure 2 and Figure 3 The dotted line means that the line is disconnected.

[0046] The reference numerals represent:

[0047] 001, drive assembly cooling unit; 002, air conditioning cooling unit;

[0048] 003, battery cooling unit; 004, radiator unit;

[0049] 1. Drive assembly external cooling water circuit; 2. Water-cooled condenser; 3. Three-way valve assembly; 31. First three-way valve; 32. Second three-way valve; 33. Third three-way valve; 34. Fourth three-way valve; 35. Fifth three-way valve; 36. Sixth three-way valve; 4. Drive assembly internal cooling water circuit; 5. Plate heat exchanger; 6. Battery pack internal cooling water circuit; 71. First water pump; 72. Second water pump; 73. Third water pump; 8. Compressor; 9. Evaporator; 10. Blower; 11. Thermal expansion valve; 12. Electronic expansion valve; 131. First air conditioner external cooling circuit; 132. Second air conditioner external cooling circuit; 133. Third air conditioner external cooling circuit; 14. Radiator external cooling water circuit; 15. Radiator; 16. Fan

[0050] E1, vehicle control and drive assembly; E2, power battery pack.

[0051] The above drawings illustrate specific embodiments of the present invention, which will be described in more detail below. These drawings and the accompanying description are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0054] It should be noted that the three-way valves included in the three-way valve assembly involved in the embodiment of the present invention are all solenoid valves, and the first interface of the three-way valve is the interface arranged in the horizontal direction in the figure, the second interface is the interface arranged in the vertical direction and located above in the figure, and the third interface is the interface arranged in the vertical direction and located below in the figure.

[0055] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0056] Electric vehicles typically use drive assembly cooling water circuits to cool the vehicle control and drive assembly, such as the drive motor and motor controller, and use air conditioning cooling circuits to dissipate heat from the interior of the cabin.

[0057] Currently, a water-cooled condenser is typically installed in the drive assembly cooling water circuit to replace the condenser in the air conditioning cooling circuit, and both systems share a common radiator. There are two possible arrangements for the water-cooled condenser and the drive assembly's internal cooling water circuit: a parallel arrangement, where the coolant, after flowing from the radiator, flows simultaneously through the drive assembly's internal cooling water circuit and the water-cooled condenser; and a series arrangement, where the coolant, after flowing from the radiator, flows sequentially through the drive assembly's internal cooling water circuit and the water-cooled condenser.

[0058] The cooling system of the electric vehicle provided by the related art is either a single series mode or a single parallel mode, which will result in the electric vehicle being unable to increase energy consumption in certain vehicle conditions.

[0059] For example, the flow resistance ratio of parallel mode is lower than that of series mode. However, parallel mode is more complex to control. In terms of cooling performance, series mode has a greater advantage in parking conditions, while parallel mode has a greater advantage in driving conditions. Therefore, choosing a cooling method based on the actual operating conditions of an electric vehicle is particularly beneficial for reducing energy consumption.

[0060] In view of the technical problems existing in the related art, the embodiment of the present invention provides an electric vehicle cooling system, as shown in the attached Figure 1 As shown, the electric vehicle cooling system includes: a drive assembly cooling unit 001, an air conditioning cooling unit 002, a battery cooling unit 003, and a radiator unit 004.

[0061] Among them, the drive assembly cooling unit 001 includes: a drive assembly external cooling water circuit 1, a water-cooled condenser 2, a three-way valve assembly 3 and a drive assembly internal cooling water circuit 4 arranged in the automobile control and drive assembly E1. The water-cooled condenser 2, the three-way valve assembly 3 and the drive assembly internal cooling water circuit 4 are all connected to the drive assembly external cooling water circuit 1.

[0062] The water-cooled condenser 2 has a refrigerant channel and a water channel. The water-cooled condenser 2 is connected to the air-conditioning cooling unit 002 through its refrigerant channel. The water-cooled condenser 2 is connected to the three-way valve assembly 3 through its water channel. The three-way valve assembly 3 is also connected to the radiator unit 004.

[0063] The battery cooling unit 003 includes: a plate heat exchanger 5 and a battery pack built-in cooling water channel 6 arranged in the power battery pack E2. The plate heat exchanger 5 has a refrigerant channel and a water channel. The plate heat exchanger 5 is connected to the air-conditioning cooling unit 002 through its refrigerant channel, and the plate heat exchanger 5 is connected to the battery pack built-in cooling water channel 6 through its water channel.

[0064] The three-way valve assembly 3 is configured to enable the drive assembly built-in cooling water channel 4 and the water-cooled condenser 2 to be switched between a series mode and a parallel mode.

[0065] See also Figure 2 In series mode, the cooling water from the radiator unit 004 flows sequentially through the drive assembly built-in cooling water channel 4 and the water channel of the water-cooled condenser 2. Figure 3 In the parallel mode, the cooling water from the radiator unit 004 flows through the water channel of the built-in cooling water path 4 of the drive assembly and the water channel of the water-cooled condenser 2 at the same time.

[0066] The electric vehicle cooling system provided by an embodiment of the present invention connects the water-cooled condenser 2 to the air conditioning cooling unit 002 through its refrigerant channel, and sets a three-way valve assembly 3 in the drive assembly cooling unit 001. The three-way valve assembly 3 is used to switch the drive assembly's built-in cooling water path 4 and the water-cooled condenser 2 between series mode and parallel mode, so that the electric vehicle cooling system has both series mode and parallel mode. The cooling method that matches the actual operating conditions of the electric vehicle is selected. For example, under parking conditions, a cooling method based on the series mode is selected, and under driving conditions, a cooling method based on the parallel mode is selected. Compared with cooling systems that only have a single series mode or parallel mode, the electric vehicle cooling system provided by an embodiment of the present invention has flexibility and selects a cooling mode according to the actual operating conditions of the electric vehicle, which helps reduce the energy consumption of the electric vehicle.

[0067] The following further describes the structure and function of each unit involved in the electric vehicle cooling system provided by the embodiment of the present invention:

[0068] In some examples, such as the attached Figure 1 -Attached Figure 3 As shown, the three-way valve assembly 3 includes: a first three-way valve 31 , a fourth three-way valve 34 , a fifth three-way valve 35 and a sixth three-way valve 36 .

[0069] Among them, the first interface of the first three-way valve 31 is connected to one end of the radiator unit 004, the second interface of the first three-way valve 31 is connected to the second interface of the sixth three-way valve 36, and the third interface of the first three-way valve 31 is connected to one end of the built-in cooling water circuit 4 of the drive assembly.

[0070] The first interface of the fifth three-way valve 35 is connected to the other end of the built-in cooling water circuit 4 of the drive assembly, the second interface of the fifth three-way valve 35 is connected to the third interface of the sixth three-way valve 36, and the first interface of the sixth three-way valve 36 is connected to one end of the water channel of the water-cooled condenser 2.

[0071] The third interface of the fifth three-way valve 35 is connected to the third interface of the fourth three-way valve 34, the second interface of the fourth three-way valve 34 is connected to the other end of the water channel of the water-cooled condenser 2, and the first interface of the fourth three-way valve 34 is connected to the other end of the radiator unit 004.

[0072] As attached Figure 2 As shown, when the drive assembly built-in cooling water path 4 and the water-cooled condenser 2 are in series connection mode, the second port of the first three-way valve 31 is closed, the first and third ports of the first three-way valve 31 are opened, and the third port of the fifth three-way valve 35 is closed, while the first and second ports of the fifth three-way valve 35 are opened. In this way, cooling water from the radiator 15 directly enters the drive assembly built-in cooling water path 4 through the third port of the first three-way valve 31. After completing heat exchange in the drive assembly built-in cooling water path 4, the cooling water enters the fifth three-way valve 35 from the drive assembly built-in cooling water path 4, enters the third port of the sixth three-way valve 36 from the second port of the fifth three-way valve 35, and enters the water channel of the water-cooled condenser 2 through the first port of the sixth three-way valve 36. After completing heat exchange in the water-cooled condenser 2, the cooling water enters the fourth three-way valve 34 and finally enters the radiator 15 for cooling.

[0073] As can be seen, when the drive assembly internal cooling water path 4 and the water-cooled condenser 2 are connected in series, the cooling water from the radiator 15 first flows through the drive assembly internal cooling water path 4 to cool the vehicle control and drive assembly E1, and then enters the water-cooled condenser 2 to exchange heat with the refrigerant in the air conditioning cooling unit 002. Therefore, this series connection mode is more suitable for parking conditions and achieves the purpose of reducing energy consumption.

[0074] As attached Figure 3As shown, when the drive assembly's built-in cooling water circuit 4 and the water-cooled condenser 2 are in parallel mode, the first, second, and third ports of the first three-way valve 31 are opened, and the second port of the fifth three-way valve 35 is closed, while the first and third ports of the fifth three-way valve 35 are opened. In this way, the cooling water from the radiator 15 enters the first three-way valve 31 and is divided into two paths.

[0075] For the first cooling water, it enters the built-in cooling water path 4 of the drive assembly through the third interface of the first three-way valve 31. After the cooling water completes the heat exchange in the built-in cooling water path 4 of the drive assembly, it enters the fifth three-way valve 35 from the built-in cooling water path 4 of the drive assembly, enters the fourth three-way valve 34 from the third interface of the fifth three-way valve 35, and finally enters the radiator 15 for cooling.

[0076] For the second cooling water, it enters the sixth three-way valve 36 through the second interface of the first three-way valve 31, and enters the water channel of the water-cooled condenser 2 through the first interface of the sixth three-way valve 36. After the cooling water completes heat exchange in the water-cooled condenser 2, it enters the fourth three-way valve 34 and finally enters the radiator 15 for cooling.

[0077] As can be seen, when the drive assembly's internal cooling water circuit 4 and the water-cooled condenser 2 are in parallel mode, the cooling water from the radiator 15 is split into two paths: one path flows through the drive assembly's internal cooling water circuit 4 to cool the vehicle control and drive assembly E1, and the other path enters the water-cooled condenser 2 to exchange heat with the refrigerant in the air conditioning cooling unit 002. Therefore, this series mode is more suitable for driving conditions and achieves the goal of reducing energy consumption.

[0078] In some examples, the first three-way valve 31, the fourth three-way valve 34, the fifth three-way valve 35 and the sixth three-way valve 36 are all solenoid valves, so as to be electrically connected to the control system of the electric vehicle, thereby opening or closing the corresponding interfaces under the control of the control system.

[0079] In some examples, such as the attached Figure 1 -Attached Figure 3 As shown, the drive assembly cooling unit 001 also includes a second three-way valve 32 and a third three-way valve 33; the first interface of the second three-way valve 32 is connected to the third interface of the first three-way valve 31, and the second interface and the third interface of the second three-way valve 32 are both connected to one end of the built-in cooling water circuit 4 of the drive assembly; the first interface of the third three-way valve 33 is connected to the first interface of the fifth three-way valve 35, and the second interface and the third interface of the third three-way valve 33 are both connected to the other end of the built-in cooling water circuit 4 of the drive assembly.

[0080] By providing a second three-way valve 32 and a third three-way valve 33 at the ends of the built-in cooling water path 4 of the drive assembly, the cooling of the vehicle control and drive assembly E1 can be more flexibly controlled. For example, according to the specific layout of the vehicle control and drive assembly E1 and the actual operating conditions of the electric vehicle, certain specific components in the vehicle control and drive assembly E1 can be cooled.

[0081] In some examples, the second three-way valve 32 and the third three-way valve 33 are both solenoid valves, so as to be electrically connected to the control system of the electric vehicle, thereby opening or closing the corresponding interface under the control of the control system.

[0082] It can be understood that the built-in cooling water circuit 4 of the drive assembly is arranged in the automobile control and drive assembly E1, which may include multiple built-in water circuit sections inside the various components in the automobile control and drive assembly E1, and multiple external water circuit sections that connect the various components in the automobile control and drive assembly E1. These built-in water circuit sections are connected in series and / or in parallel with the external water circuit sections, so that the built-in cooling water circuit 4 of the drive assembly forms a complete and uninterrupted passage.

[0083] Attachment Figure 1 -Attached Figure 3 An example of a typical electric vehicle control and drive assembly E1 is shown in the attached figure. Figure 1 As shown, the vehicle control and drive assembly E1 includes: an Advanced Driving Assistance System (ADAS), a D+C-based high-voltage "electronic control" system integration (Conversion & Distribution Unit (CDU), a motor microcontroller unit (MCU), a front drive motor (FMotor), and a rear drive motor (RMotor). The ADAS, CDU, MCU, FMotor, and RMotor all have corresponding drive assembly built-in cooling water circuits 4.

[0084] See also Figure 1-Figure 3 The ADAS and CDU's built-in cooling water circuits are connected in parallel, and then in series with the MCU and RMotor's built-in cooling water circuits to form the first built-in cooling water circuit. The FMotor uses a separate second built-in cooling water circuit, which is arranged in parallel with the first.

[0085] Specifically, the first port of the second three-way valve 32 is connected to the third port of the first three-way valve 31, and the second and third ports of the second three-way valve 32 are connected to the inlet of the first and second built-in cooling water circuits, respectively. The first port of the third three-way valve 33 is connected to the first port of the fifth three-way valve 35, and the second and third ports of the third three-way valve 33 are connected to the outlet of the first and second built-in cooling water circuits, respectively.

[0086] The cooling water entering through the first interface of the second three-way valve 32 can flow into the corresponding component of the corresponding vehicle control and drive assembly E1 through at least one of the second interface and the third interface of the second three-way valve 32, and finally converge into the third three-way valve 33 through the second interface and the third interface of the third three-way valve 33 respectively, and be discharged through the first interface of the third three-way valve 33.

[0087] In the embodiment of the present invention, see Figure 1-Figure 3 For the first three-way valve 31, the second three-way valve 32, the third three-way valve 33, the fourth three-way valve 34 and the fifth three-way valve 35, their first interfaces are the interfaces arranged horizontally in the figure, the second interfaces are the interfaces arranged vertically and located above in the figure, and the third interfaces are the interfaces arranged vertically and located below in the figure.

[0088] Furthermore, as attached Figure 1 -Attached Figure 3 As shown, the drive assembly cooling unit 001 also includes: a second water pump 72 and a third water pump 73; the second water pump 72 is located on the drive assembly external cooling water circuit 1 between the first interface of the sixth three-way valve 36 and the water-cooled condenser 2; the third water pump 73 is located on the drive assembly external cooling water circuit 1 between the third interface of the first three-way valve 31 and the first interface of the second three-way valve 32.

[0089] The second water pump 72 and the third water pump 73 are provided to provide circulation power for the circulation of cooling water.

[0090] When the built-in cooling water channel 4 of the driving assembly and the water-cooled condenser 2 are in series connection mode, the second water pump 72 is in operation and the third water pump 73 is in operation.

[0091] When the built-in cooling water path 4 of the driving assembly and the water-cooled condenser 2 are in parallel mode, the second water pump 72 and the third water pump 73 both operate simultaneously.

[0092] As attached Figure 1 -Attached Figure 3 As shown, the battery cooling unit 003 further includes a first water pump 71 ; the water channel of the plate heat exchanger 5 , the first water pump 71 , and the battery pack built-in cooling water channel 6 are sequentially connected in a closed loop.

[0093] The first water pump 71 provides circulation power for the circulation of cooling water in the battery cooling unit 003 . The first water pump 71 can transport the cooling water from the plate heat exchanger 5 to the battery pack built-in cooling water path 6 of the power battery pack E2 .

[0094] The battery cooling unit 003 operates based on the following closed-loop water circuit:

[0095] The high-temperature cooling water and the low-temperature refrigerant exchange heat in the plate heat exchanger 5. The cooled cooling water is pumped by the first water pump 71 to the built-in cooling water path 6 of the battery pack to cool the power battery pack E2. After absorbing heat and rising in temperature, the cooling water circulates again into the plate heat exchanger 5 to exchange heat with the low-temperature refrigerant.

[0096] In some examples, the plate heat exchanger 5 involved in the embodiments of the present invention is a Chiller heat exchanger, thereby achieving higher heat exchange efficiency.

[0097] For the air conditioning cooling unit 002, in some examples, as shown in the attached Figure 1 -Attached Figure 3 As shown, the air conditioning cooling unit 002 includes a compressor 8 , an evaporator 9 , a blower 10 , a thermal expansion valve 11 and an electronic expansion valve 12 .

[0098] The refrigerant channels of the compressor 8 and the water-cooled condenser 2 are connected in series in sequence to the first air-conditioning external cooling circuit 131; the first end of the first air-conditioning external cooling circuit 131 is divided into two paths, one path is connected to the first end of the second air-conditioning external cooling circuit 132, and the other path is connected to the first end of the third air-conditioning external cooling circuit 133; the second end of the second air-conditioning external cooling circuit 132 and the second end of the third air-conditioning external cooling circuit 133 merge and are connected to the second end of the first air-conditioning external cooling circuit 131.

[0099] The refrigerant channels of the electronic expansion valve 12 and the plate heat exchanger 5 are sequentially connected in series to the second air-conditioning external cooling circuit 132 along the refrigerant flow direction.

[0100] The thermal expansion valve 11 and the evaporator 9 are sequentially connected in series to the third air-conditioning external cooling circuit 133 along the refrigerant flow direction, and the blower 10 is arranged facing the evaporator 9 .

[0101] The refrigerant channels of the electronic expansion valve 12 and the plate heat exchanger 5 are connected in series to the second air-conditioning external cooling circuit 132 along the refrigerant flow direction. This allows the refrigerant in the plate heat exchanger 5 to exchange heat with the cooling water circulating in the battery cooling unit 003, thereby cooling the power battery pack E2. The electronic expansion valve 12 adjusts the refrigerant flow rate in the second air-conditioning external cooling circuit 132 according to a pre-set program, ensuring that the power battery pack E2 is consistently and effectively cooled.

[0102] The thermal expansion valve 11 and the evaporator 9 are connected in series in the third air-conditioning external cooling circuit 133 along the flow direction of the refrigerant, and the blower 10 is arranged facing the evaporator 9. The evaporator 9 can convert the liquid refrigerant into gas, and then the blower 10 blows the gas out, thereby achieving the purpose of cooling. In this process, the thermal expansion valve 11 is used to control the superheat of the evaporator 9 when processing the refrigerant. Finally, the heat absorbed by the evaporator 9 of the air-conditioning cooling unit 002 is transferred to the water-cooled condenser 2 (wherein the refrigerant exchanges heat with the cooling water), and then released to the outside of the electric vehicle by the radiator 15.

[0103] In the embodiment of the present invention, the blower 10 is centrally arranged facing the evaporator 9 with a set distance between them.

[0104] In the embodiment of the present invention, the compressor 8 is used to compress and drive the refrigerant in the air-conditioning cooling unit 002 to provide power for the refrigeration cycle, thereby realizing the compression-condensation-expansion-evaporation refrigeration cycle.

[0105] For radiator unit 004, as shown in the attached Figure 1 -Attached Figure 3 As shown, the radiator unit 004 includes an external cooling water circuit 14 for the radiator, a radiator 15 and a fan 16; wherein, one end of the external cooling water circuit 14 for the radiator is connected to the first interface of the first three-way valve 31, and the other end of the external cooling water circuit 14 for the radiator is connected to the first interface of the fourth three-way valve 34; the radiator 15 is connected to the external cooling water circuit 14 for the radiator, and the fan 16 is arranged facing the radiator 15.

[0106] The fan 16 is used to provide air to the radiator 15 as a heat exchange medium. The cooling water flows in the core of the radiator 15, and the air passes outside the radiator 15. In this way, the hot cooling water cools down due to the heat dissipation to the air, and the cold air heats up due to absorbing the heat dissipated by the cooling water.

[0107] On the other hand, an embodiment of the present invention further provides an electric vehicle, which includes any of the above-mentioned electric vehicle cooling systems.

[0108] The electric vehicle provided by the embodiments of the present invention possesses all the advantages of an electric vehicle cooling system. Because the electric vehicle cooling system features both series and parallel modes, a cooling method that matches the actual operating conditions of the electric vehicle is selected. For example, a cooling method based on the series mode is selected for parking conditions, and a cooling method based on the parallel mode is selected for driving conditions. Compared to cooling systems with only a single series mode or parallel mode, the electric vehicle cooling system provided by the embodiments of the present invention offers flexibility, allowing the cooling mode to be selected based on the actual operating conditions of the electric vehicle. This helps reduce the electric vehicle's energy consumption and thus increase its range.

[0109] It can be understood that the electric vehicle is provided with a vehicle control and drive assembly E1 and a power battery pack E2 waiting for cooling components.

[0110] In some examples, the electric vehicle includes a control system, which is electrically connected to the three-way valve assembly 3 .

[0111] Wherein, the control system is configured as follows:

[0112] Obtain the current vehicle condition and confirm the cooling method that matches the current vehicle condition, wherein the cooling methods include: the built-in cooling water path 4 of the drive assembly and the water-cooled condenser 2 are in series mode, and the built-in cooling water path 4 of the drive assembly and the water-cooled condenser 2 are in parallel mode.

[0113] According to the confirmed cooling mode, the operation of the three-way valve assembly 3 is controlled to switch the electric vehicle cooling system to the series mode or the parallel mode.

[0114] For example, the current vehicle condition is obtained, including but not limited to at least one of the following vehicle condition information: current ambient temperature, current return air temperature, current vehicle speed, and current air conditioning status.

[0115] According to the above-mentioned current vehicle condition information, the control system determines the optimal cooling method corresponding to the current vehicle condition based on the built-in algorithm, and then controls the three-way valve assembly 3 according to the judgment result, so that the electric vehicle cooling system switches to the target cooling mode, that is, the series mode or the parallel mode. In this way, while ensuring excellent cooling effect, it ensures that energy consumption will not increase additionally, thereby achieving the purpose of reducing energy consumption, which is also beneficial to improving the endurance of the electric vehicle.

[0116] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0117] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An electric vehicle cooling system, characterized in that: The electric vehicle cooling system comprises: a drive assembly cooling unit (001), an air conditioning cooling unit (002), a battery cooling unit (003), and a radiator unit (004); The drive assembly cooling unit (001) comprises: a drive assembly external cooling water circuit (1), a water-cooled condenser (2), a three-way valve assembly (3), and a drive assembly internal cooling water circuit (4) arranged in the vehicle control and drive assembly (E1); the water-cooled condenser (2), the three-way valve assembly (3), and the drive assembly internal cooling water circuit (4) are all connected to the drive assembly external cooling water circuit (1); The water-cooled condenser (2) has a refrigerant channel and a water channel. The water-cooled condenser (2) is connected to the air-conditioning cooling unit (002) via its refrigerant channel. The water-cooled condenser (2) is connected to the three-way valve assembly (3) via its water channel. The three-way valve assembly (3) is also connected to the radiator unit (004). The battery cooling unit (003) comprises: a plate heat exchanger (5) and a battery pack built-in cooling water path (6) provided in the power battery pack (E2); the plate heat exchanger (5) has a refrigerant channel and a water channel; the plate heat exchanger (5) is connected to the air conditioning cooling unit (002) via its refrigerant channel; and the plate heat exchanger (5) is connected to the battery pack built-in cooling water path (6) via its water channel; The three-way valve assembly (3) is configured to enable the built-in cooling water circuit (4) of the drive assembly and the water-cooled condenser (2) to switch between a series mode and a parallel mode; The three-way valve assembly (3) comprises: a first three-way valve (31), a fourth three-way valve (34), a fifth three-way valve (35) and a sixth three-way valve (36); The first interface of the first three-way valve (31) is connected to one end of the radiator unit (004), the second interface of the first three-way valve (31) is connected to the second interface of the sixth three-way valve (36), and the third interface of the first three-way valve (31) is connected to one end of the built-in cooling water circuit (4) of the drive assembly; The first interface of the fifth three-way valve (35) is connected to the other end of the built-in cooling water circuit (4) of the drive assembly, the second interface of the fifth three-way valve (35) is connected to the third interface of the sixth three-way valve (36), and the first interface of the sixth three-way valve (36) is connected to one end of the water channel of the water-cooled condenser (2); The third interface of the fifth three-way valve (35) is connected to the third interface of the fourth three-way valve (34), the second interface of the fourth three-way valve (34) is connected to the other end of the water channel of the water-cooled condenser (2), and the first interface of the fourth three-way valve (34) is connected to the other end of the radiator unit (004).

2. The electric vehicle cooling system according to claim 1, characterized in that: The drive assembly cooling unit (001) further includes a second three-way valve (32) and a third three-way valve (33); The first interface of the second three-way valve (32) is connected to the third interface of the first three-way valve (31), and the second interface and the third interface of the second three-way valve (32) are both connected to one end of the built-in cooling water circuit (4) of the drive assembly; The first interface of the third three-way valve (33) is connected to the first interface of the fifth three-way valve (35), and the second interface and the third interface of the third three-way valve (33) are both connected to the other end of the built-in cooling water circuit (4) of the drive assembly.

3. The electric vehicle cooling system according to claim 2, characterized in that: The drive assembly cooling unit (001) further includes: a second water pump (72) and a third water pump (73); The second water pump (72) is located on the external cooling water circuit (1) of the drive assembly between the first interface of the sixth three-way valve (36) and the water-cooled condenser (2); The third water pump (73) is located on the external cooling water circuit (1) of the drive assembly between the third interface of the first three-way valve (31) and the first interface of the second three-way valve (32).

4. The electric vehicle cooling system according to claim 1, characterized in that: The battery cooling unit (003) further includes a first water pump (71); The water channel of the plate heat exchanger (5), the first water pump (71), and the battery pack built-in cooling water channel (6) are sequentially connected in a closed loop.

5. The electric vehicle cooling system according to claim 4, characterized in that: The plate heat exchanger (5) is a Chiller heat exchanger.

6. The electric vehicle cooling system according to claim 1, characterized in that: The air conditioning cooling unit (002) comprises a compressor (8), an evaporator (9), a blower (10), a thermal expansion valve (11) and an electronic expansion valve (12); The refrigerant channels of the compressor (8) and the water-cooled condenser (2) are sequentially connected in series to the first air-conditioning external cooling circuit (131); The first end of the first air-conditioning external cooling circuit (131) is divided into two paths, one path is connected to the first end of the second air-conditioning external cooling circuit (132), and the other path is connected to the first end of the third air-conditioning external cooling circuit (133); The second end of the second air-conditioning external cooling circuit (132) and the second end of the third air-conditioning external cooling circuit (133) merge and are connected to the second end of the first air-conditioning external cooling circuit (131); The electronic expansion valve (12) and the refrigerant channel of the plate heat exchanger (5) are sequentially connected in series to the second air-conditioning external cooling circuit (132) along the refrigerant flow direction; The thermal expansion valve (11) and the evaporator (9) are sequentially connected in series to the third air-conditioning external cooling circuit (133) along the refrigerant flow direction, and the blower (10) is arranged facing the evaporator (9).

7. The electric vehicle cooling system according to claim 1, characterized in that: The radiator unit (004) includes an external cooling water channel (14), a radiator (15) and a fan (16); One end of the radiator external cooling water circuit (14) is connected to the first interface of the first three-way valve (31), and the other end of the radiator external cooling water circuit (14) is connected to the first interface of the fourth three-way valve (34); The radiator (15) is connected to the radiator external cooling water channel (14), and the fan (16) is arranged facing the radiator (15).

8. An electric vehicle, characterized in that: The electric vehicle comprises the electric vehicle cooling system according to any one of claims 1 to 7.

9. The electric vehicle according to claim 8, characterized in that: The electric vehicle comprises a control system, wherein the control system is electrically connected to the three-way valve assembly (3); The control system is configured to: Acquiring a current vehicle condition and confirming a cooling method that matches the current vehicle condition, wherein the cooling method includes: the drive assembly built-in cooling water path (4) and the water-cooled condenser (2) are in a series mode, and the drive assembly built-in cooling water path (4) and the water-cooled condenser (2) are in a parallel mode; According to the confirmed cooling mode, the operation of the three-way valve assembly (3) is controlled to switch the electric vehicle cooling system to the series mode or the parallel mode.

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