Thermal management system for new energy vehicle and new energy vehicle

Abstract

The present application discloses a thermal management system for a new energy vehicle. The present application is designed with a heat dissipation main circuit, which has a first input end and a first output end; the cooling medium has a first flow rate; a first cooling branch, which has a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end; the first cooling branch includes a first component to be cooled; the output end of the first component to be cooled is connected to the second output end; a first throttle valve is connected between the second input end and the first component to be cooled; the first throttle valve has a third input end and a third output end; the first throttle valve has a second flow rate; a second cooling branch, the second cooling branch has a fourth input end and a fourth output end; the fourth input end is connected to the third input end; the fourth output end is connected to the third output end; the second cooling branch has a third flow rate; the first flow rate is equal to the sum of the second flow rate and the third flow rate.

Description

Technical Field

[0001] The present disclosure relates to the field of thermal management technology, and in particular to a thermal management system for a new energy vehicle and a new energy vehicle. Background Art

[0002] In recent years, China's new energy vehicles have performed outstandingly. In the field of intelligent driving of new energy vehicles, China has creatively created the MDC (Mobile Data Center) intelligent driving computing platform, which is known as the "super brain" of intelligent driving. Compared with other autonomous driving computing platforms, the MDC intelligent driving computing platform has the advantages of "three highs and one low", namely "high computing power, high security, high energy efficiency, and deterministic low latency".

[0003] As a computing power platform, MDC has larger physical boundaries and usually requires water cooling compared to traditional on-board controllers. However, the cooling flow rate required by MDC is less than the flow rate requirement of existing cooling pipelines. Directly adding MDC to existing cooling pipelines cannot meet the flow rate of existing cooling pipelines. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a thermal management system for new energy vehicles and a new energy vehicle that is suitable for the flow requirements of existing cooling pipes.

[0005] In a first aspect, a thermal management system for a new energy vehicle comprises:

[0006] A heat dissipation main circuit, the heat dissipation main circuit is used to provide a cooling medium; the heat dissipation main circuit has a first input end and a first output end; the cooling medium has a first flow rate;

[0007] a first cooling branch, wherein the first cooling branch has a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end; the first cooling branch includes a first component to be cooled; the output end of the first component to be cooled is connected to the second output end;

[0008] A first throttle valve is connected between the second input end and the first component to be cooled; the first throttle valve has a third input end and a third output end; the first throttle valve has a second flow rate;

[0009] a second cooling branch, the second cooling branch being used to provide cooling medium for the MDC module; the second cooling branch having a fourth input end and a fourth output end; the fourth input end being connected to the third input end; the fourth output end being connected to the third output end; the second cooling branch having a third flow rate;

[0010] The first flow rate is equal to the sum of the second flow rate and the third flow rate.

[0011] The technical solution provided in the embodiment of the present application also includes:

[0012] a third cooling branch, the third cooling branch having a fifth input end and a fifth output end; the fifth input end is connected to the first output end; the fifth output end is connected to the first input end; the third cooling branch includes a second component to be cooled; the third cooling branch has a fourth flow rate;

[0013] The first flow rate is equal to the sum of the second flow rate, the third flow rate and the fourth flow rate.

[0014] According to the technical solution provided in the embodiment of the present application, a second throttle valve is further provided on the first cooling branch between the first component to be cooled and the second output end;

[0015] The second throttle valve has a fifth flow rate, and the fifth flow rate is smaller than the second flow rate.

[0016] According to the technical solution provided in the embodiment of the present application, the first component to be cooled includes: a power supply component and a first drive motor located between the third output terminal and the second output terminal and connected in sequence.

[0017] According to the technical solution provided in the embodiment of the present application, the second component to be cooled includes: a range extender generator controller, a second drive motor and a generator located between the fifth input terminal and the fifth output terminal and connected in sequence.

[0018] According to the technical solution provided in the embodiment of the present application, the main heat dissipation circuit includes: a second water pump, a motor radiator, a temperature sensor and a first water pump connected in series in sequence.

[0019] According to the technical solution provided in the embodiment of the present application, the first water pump has a sixth input end and a sixth output end, and the sixth output end is connected to the third input end and the fourth input end;

[0020] The temperature sensor has a seventh input terminal and a seventh output terminal, and the seventh output terminal is connected to the sixth input terminal;

[0021] The motor radiator has an eighth input terminal and an eighth output terminal, and the eighth output terminal is connected to the seventh input terminal;

[0022] The second water pump has a ninth input end and a ninth output end, the ninth output end is connected to the eighth input end, and the ninth input end is connected to the second output end and the fourth output end.

[0023] According to the technical solution provided in the embodiment of the present application, the main heat dissipation circuit also includes: an expansion water tank, which has a tenth input terminal and a tenth output terminal, the tenth input terminal is connected to the eighth output terminal, and the tenth output terminal is connected to the seventh input terminal.

[0024] According to the technical solution provided in the embodiment of the present application, the first throttle valve has a first inner diameter, the second throttle valve has a second inner diameter, and the first inner diameter is larger than the second inner diameter.

[0025] In a second aspect, a new energy vehicle includes: a thermal management system for a new energy vehicle as described in any one of the above items.

[0026] In summary, the technical solution specifically discloses a thermal management system for a new energy vehicle and a new energy vehicle. The present application is designed with a heat dissipation main circuit, which is used to provide a cooling medium; the heat dissipation main circuit has a first input end and a first output end; the cooling medium has a first flow rate; a first cooling branch, the first cooling branch has a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end; the first cooling branch includes a first component to be cooled; the output end of the first component to be cooled is connected to the second output end; a first throttle valve is connected between the second input end and the first component to be cooled; the first throttle valve has a third input end and a third output end; the first throttle valve has a second flow rate; a second cooling branch, the second cooling branch is used to provide a cooling medium for the MDC module The second cooling branch has a fourth input end and a fourth output end; the fourth input end is connected to the third input end; the fourth output end is connected to the third output end; the second cooling branch has a third flow rate; the first flow rate is equal to the sum of the second flow rate and the third flow rate. Since the flow rate requirements of the MDC module and the first component to be cooled are different, they are set on different cooling branches, the first component to be cooled is set on the first cooling branch, and the MDC module is set on the second cooling branch. The first cooling branch and the second cooling branch are both used to shunt the heat dissipation main circuit. At the same time, a first throttle valve is set on the first cooling branch to balance the flow rate of the first cooling branch to avoid excessive pressure caused by different flow rate requirements of the MDC module and the first component to be cooled, thereby damaging the thermal management system of the new energy vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 This is a schematic diagram of the thermal management system structure of a new energy vehicle.

[0029] Numbers in the figure: 1. Main heat dissipation circuit; 2. First cooling branch; 3. First throttle valve; 4. Second cooling branch; 5. MDC module; 6. Third cooling branch; 7. Second throttle valve; 8. Power supply assembly; 9. First drive motor; 10. Range extender generator controller; 11. Second drive motor; 12. Generator; 13. First water pump; 14. Temperature sensor; 15. Motor radiator; 16. Second water pump; 17. Expansion water tank. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] Embodiment 1

[0033] Please refer to Figure 1 The present application provides a thermal management system for a new energy vehicle, including:

[0034] The heat dissipation main circuit 1 is used to provide a cooling medium; the heat dissipation main circuit 1 has a first input end and a first output end; the cooling medium has a first flow rate;

[0035] The first cooling branch 2 has a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end; the first cooling branch 2 includes a first component to be cooled; the output end of the first component to be cooled is connected to the second output end;

[0036] A first throttle valve 3 is connected between the second input end and the first component to be cooled; the first throttle valve 3 has a third input end and a third output end; the first throttle valve 3 has a second flow rate;

[0037] The second cooling branch 4 is used to provide cooling medium for the MDC module 5; the second cooling branch 4 has a fourth input end and a fourth output end; the fourth input end is connected to the third input end; the fourth output end is connected to the third output end; the second cooling branch 4 has a third flow rate;

[0038] The first flow rate is equal to the sum of the second flow rate and the third flow rate.

[0039] In this embodiment, Figure 1 The arrows in indicate the flow direction of the cooling medium;

[0040] The main heat dissipation circuit 1 is used to provide a cooling medium; optionally, the type of the cooling medium is, for example, liquid water;

[0041] The cooling medium is set to liquid water, and its higher specific heat capacity can be used to improve its heat absorption of the entire thermal management system. In addition, liquid water has a relatively low cost and less harm to the environment, making it more environmentally friendly. In practical applications, the cooling medium can also be other fluids with larger heat capacity, which are not limited here.

[0042] The heat dissipation main circuit 1 has a first input end and a first output end; the cooling medium has a first flow rate; the first cooling branch 2, the first cooling branch 2 has a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end;

[0043] Furthermore, the motor in the new energy vehicle will generate a lot of heat when the new energy vehicle is running, and excessive heat will harm the motor and the entire vehicle thermal management system, so the motor needs to work within a certain temperature range;

[0044] Specifically, the first cooling branch 2 includes a first component to be cooled; the output end of the first component to be cooled is connected to the second output end;

[0045] A first cooling branch 2, which is used to cool a first component to be cooled;

[0046] A first throttle valve 3 is provided between the second input end and the first component to be cooled; the first throttle valve 3 has a third input end and a third output end; the first throttle valve 3 has a second flow rate; the first throttle valve 3 is used to control the fluid flow rate at the input end of the first cooling branch 2 by changing the throttling cross section;

[0047] Further, the second flow rate is ≥12 L / min;

[0048] The second cooling branch 4 is used to provide a cooling medium for the MDC module 5 to cool the MDC module 5;

[0049] MDC is positioned as a computing platform for intelligent driving (hereinafter referred to as Huawei MDC platform), including standardized series of hardware products, intelligent driving operating systems AOS, VOS and MDC Core, supporting tool chains and vehicle-road-cloud collaborative services, supporting component service, interface standardization, and development toolization to meet automotive-grade safety requirements; the flow requirement of MDC module 5 is 1 to 3L / min;

[0050] The second cooling branch 4 has a fourth input end and a fourth output end; the fourth input end is connected to the third input end; the fourth output end is connected to the third output end; the second cooling branch 4 has a third flow rate; the first flow rate is equal to the sum of the second flow rate and the third flow rate;

[0051] Further, the third flow rate is 1 to 3 L / min;

[0052] Since the flow requirements of the MDC module 5 and the input end of the first component to be cooled are different, they are set on different cooling branches. The first component to be cooled is set on the first cooling branch 2, and the MDC module 5 is set on the second cooling branch 4. The first cooling branch 2 and the second cooling branch 4 are both used to divert the heat dissipation main circuit 1. At the same time, a first throttle valve 3 is set on the first cooling branch 2 to balance the flow of the first cooling branch 2 to meet the flow requirements of the input end of the first component to be cooled and avoid damaging the thermal management system of the new energy vehicle.

[0053] like Figure 1 As shown, it also includes:

[0054] A third cooling branch 6, the third cooling branch 6 has a fifth input end and a fifth output end; the fifth input end is connected to the first output end; the fifth output end is connected to the first input end;

[0055] Specifically, the third cooling branch 6 includes a second component to be cooled;

[0056] A third cooling branch 6, which is used to cool the second component to be cooled; the third cooling branch 6 has a fourth flow rate;

[0057] Further, the fourth flow rate is ≥ 12 L / min;

[0058] The first flow rate is equal to the sum of the second flow rate, the third flow rate and the fourth flow rate;

[0059] Since the flow requirements at the input ends of the MDC module 5 and the second component to be cooled are different, they are set on different cooling branches, and the second component to be cooled is set on the third cooling branch 6. The first cooling branch 2, the second cooling branch 4 and the third cooling branch 6 are all used to divert the main heat dissipation circuit 1 to avoid the MDC module 5 and the second component to be cooled being connected in series on the same branch. The excessive pressure generated in the MDC module 5 due to different flow requirements may damage the thermal management system of the new energy vehicle.

[0060] like Figure 1 As shown, a second throttle valve 7 is also provided on the first cooling branch 2 between the first component to be cooled and the second output end;

[0061] A second throttle valve 7, which is used to control the fluid flow at the output end of the first cooling branch 2 by changing the throttling cross section;

[0062] The second throttle valve 7 has a fifth flow rate, which is smaller than the second flow rate;

[0063] The first throttle valve 3 has a first inner diameter, and the second throttle valve 7 has a second inner diameter, and the first inner diameter is larger than the second inner diameter;

[0064] Preferably, the first inner diameter of the first throttle valve 3 is 10 mm, and the second inner diameter of the second throttle valve 7 is 7 mm; the flow rates input into the first cooling branch 2 and the third cooling branch 6 are the same, and the flow rate at the first throttle valve 3 in the first cooling branch 2 is smaller than the flow rate at the second throttle valve 7.

[0065] like Figure 1 As shown, specifically, the first component to be cooled includes: a power supply component 8 and a first drive motor 9 which are located between the third output terminal and the second output terminal and are connected in sequence;

[0066] The power supply assembly 8 includes a PDU, a DCDC and an OBC, which are a three-in-one structure; the power supply assembly 8 integrates the PDU, the DCDC and the OBC on a circuit board, and the power supply assembly 8 is small in size and is used for vehicle-mounted power supply;

[0067] PDU (Power Distribution Unit) is a power distribution unit, that is, a power distribution socket for a cabinet. PDU is a product designed to provide power distribution for cabinet-mounted electrical equipment. It has many series of specifications with different functions, different installation methods, and different socket combinations, and can provide suitable rack-mounted power distribution solutions for different power supply environments.

[0068] DCDC (DC-to-DC converter) is a DC-DC converter or power converter, which is used to convert a DC power supply of a certain voltage level into a DC power supply of another voltage level;

[0069] OBC (On Board Charger) is a car charger, which is used to facilitate the car power supply to charge digital products anytime and anywhere. It is generally used in car battery (12V car) power supply experiments;

[0070] When charging a new energy vehicle, instead of directly connecting the external charger to the large battery, the battery of the new energy vehicle is charged through the OBC, which mainly plays a protective role;

[0071] Preferably, the type of the first drive motor 9 is, for example, drive motor HW200.

[0072] like Figure 1As shown, specifically, the second component to be cooled includes: a range extender generator controller 10, a second drive motor 11 and a generator 12, which are located between the fifth input terminal and the fifth output terminal and are connected in sequence;

[0073] The range extender generator controller 10 is used to start the generator 12, convert the energy of the generator 12 into electrical energy, charge the battery, and provide energy to the second drive motor 11. It is responsible for starting and stopping the generator 12, converting energy, improving efficiency, and saving energy and reducing emissions;

[0074] The range extender generator controller 10 requires a lower water inlet temperature than the second drive motor 11 and the generator 12, and is arranged at the fifth input end of the third cooling branch 6. The water inlet temperature is the outlet water temperature of the motor radiator 15, and the temperature is relatively low, which is not easy to cause overheating of the range extender generator controller 10;

[0075] Preferably, the type of the second drive motor 11 is, for example, drive motor HW165.

[0076] like Figure 1 As shown, specifically, the heat dissipation main circuit 1 includes: a second water pump 16, a motor radiator 15, a temperature sensor 14 and a first water pump 13 connected in series in sequence;

[0077] The first water pump 13 has a sixth input terminal and a sixth output terminal, and the sixth output terminal is connected to the third input terminal and the fourth input terminal; the temperature sensor 14 has a seventh input terminal and a seventh output terminal, and the seventh output terminal is connected to the sixth input terminal; the motor radiator 15 has an eighth input terminal and an eighth output terminal, and the eighth output terminal is connected to the seventh input terminal; the second water pump 16 has a ninth input terminal and a ninth output terminal, and the ninth output terminal is connected to the eighth input terminal, and the ninth input terminal is connected to the second output terminal and the fourth output terminal;

[0078] Optionally, the type of the motor radiator 15 is, for example, a blast heat exchanger. Setting the motor radiator 15 as a blast heat exchanger can increase the air volume of the heat exchanger for heat dissipation, thereby improving the heat dissipation efficiency;

[0079] Optionally, the motor radiator 15 can be a heat exchanger. After the cooling medium absorbs heat in the MDC module, the first component to be cooled and the second component to be cooled, it is pumped into the motor radiator 15 by the first water pump 13. Air flows outside the motor radiator 15, and the heat in the cooling medium is dissipated to the air, the temperature is reduced, and then it flows out of the motor radiator 15, and then it is pumped back to the MDC module, the first component to be cooled and the second component to be cooled by the second water pump 16 for circulation, so as to ensure that the MDC module, the first component to be cooled and the second component to be cooled work within the normal temperature range. At this time, the temperature sensor 14 detects the temperature of the heat dissipation main circuit 1 in real time;

[0080] Furthermore, an electric fan may be provided outside the motor radiator 15, and the electric fan may increase the heat dissipation capacity of the motor radiator 15 and accelerate the cooling of the coolant.

[0081] like Figure 1 As shown, the heat dissipation main circuit 1 further includes: an expansion water tank 17, which has a tenth input end and a tenth output end, the tenth input end is connected to the eighth output end, and the tenth output end is connected to the seventh input end;

[0082] The expansion water tank 17 is used to control the pressure of the heat dissipation main circuit 1 and remove the gas in the liquid pipelines of the first cooling branch 1, the second cooling branch 4 and the third cooling branch 6; wherein the liquid pipelines are filled with cooling medium, and the first water pump 13 and the second water pump 16 drive the cooling medium to circulate in the heat dissipation main circuit 1;

[0083] Furthermore, the motor radiator 15 and the expansion water tank 17 are connected and communicated through a degassing pipe, and the expansion water tank 17 is also used to remove gas in the motor radiator 15 through the degassing pipe;

[0084] The motor radiator 15 is used to release the heat to the external space to achieve overall heat dissipation and cooling, so that it can be maintained within a good operating temperature range; and by setting an expansion water tank 17 connected to the pipeline, the pressure of the cooling medium in the pipeline can be stabilized and balanced, and the cooling medium can be conveniently replenished in the pipeline through the expansion water tank 17; through the thermal management system of the new energy vehicle, various motors of the new energy vehicle can be conveniently managed, and when the ambient temperature is low, electric heating is not required to maintain the operating temperature, the power consumption is low, the power consumption of the power supply component 8 of the new energy vehicle can be reduced, and the cruising range of the new energy vehicle can be improved.

[0085] Embodiment 2

[0086] Please refer to Figure 1 A new energy vehicle provided by the present application as shown includes: a thermal management system for the new energy vehicle as described in Embodiment 1;

[0087] Exemplarily, the thermal management system also includes electric drive water pump control, which includes a normal power-on state, a charge and discharge mode, a remote control mode (without range extension), a nap mode, and a pet mode;

[0088] (1) Normal power-on state: The vehicle is powered on at normal high voltage; the power assembly 8 or the range extender generator controller 10 or the MDC module is in working state; the first water pump 13 and the second water pump 16 are running at low speed, and the initial duty cycle is 20%; the water flow rate pumped by the first water pump 13 and the second water pump 16 during low-speed operation must meet the minimum flow rate requirements of each component of the electric drive system, and after meeting the speed limit in "electric drive water pump speed regulation", the water pump speed is regulated according to the flow rate requirements;

[0089] Furthermore, the duty cycle is the proportion of the power-on time to the total time in one pulse cycle, that is, in one pulse cycle, the power supply component 8 is intermittently powered, and the power supply time accounts for 20% of the total time.

[0090] (2) Charging and discharging mode, remote control mode (without range extension), nap mode, and pet mode: After the vehicle is powered on with high voltage, the first water pump 13 does not run. After the thermal management system meets the speed limit in "electric drive water pump speed regulation", it regulates the water pump speed according to the flow requirements of each part.

[0091] Exemplary operation strategy of the electric drive system after cooling down:

[0092] When the vehicle has a high-voltage power-off demand (except for emergency high-voltage power-off), VDC (Vehicle Dynamics Control) makes a comprehensive judgment based on the required temperature of the electric drive system. If the temperature of the electric drive system components is close to the power limit value, the electric drive system enters the post-cooling operation stage; the temperature of the first drive motor 9, the second drive motor 11, the range extender generator controller 10, the MDC module 5, and the power supply assembly 8 or the electric drive water inlet temperature is lower than the post-operation shutdown threshold temperature point or the post-operation exceeds 60s, and the post-operation is shut down.

[0093] Furthermore, new energy vehicles are not just pure electric vehicles. New energy vehicles include pure electric and plug-in hybrid vehicles, etc. The power battery capacity of plug-in hybrid vehicles is relatively high, the cruising range in pure electric mode is longer, the fuel rationality is stronger, and the exhaust emissions are lower; therefore, new energy vehicles refer to vehicles that use unconventional automotive fuels as a power source (or use conventional automotive fuels and adopt new on-board power devices), integrate advanced technologies in vehicle power control and drive, and form vehicles with advanced technical principles, new technologies and new structures. New energy vehicles include four major types: hybrid electric vehicles (HEV), pure electric vehicles (BEV, including solar vehicles), fuel cell electric vehicles (FCEV), and other new energy vehicles (such as supercapacitors, flywheels and other high-efficiency energy storage devices). Unconventional automotive fuels refer to fuels other than gasoline and diesel; new energy vehicles have the advantages of saving fuel energy, reducing exhaust emissions, high efficiency and low noise.

[0094] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0095] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0096] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A thermal management system for new energy vehicles, It is characterized in that include: A main heat dissipation circuit (1), the main heat dissipation circuit (1) being used to provide a cooling medium; The main heat dissipation circuit (1) has a first input end and a first output end; The cooling medium has a first flow rate; A first cooling branch (2), the first cooling branch (2) having a second input end and a second output end; the second input end is connected to the first output end; the second output end is connected to the first input end; the first cooling branch (2) comprises a first component to be cooled; the output end of the first component to be cooled is connected to the second output end; A first throttle valve (3) is connected between the second input end and the first component to be cooled; the first throttle valve (3) has a third input end and a third output end; the first throttle valve (3) has a second flow rate; a second cooling branch (4), the second cooling branch (4) being used to provide a cooling medium for the MDC module (5); the second cooling branch (4) having a fourth input end and a fourth output end; the fourth input end being connected to the third input end; the fourth output end being connected to the third output end; the second cooling branch (4) having a third flow rate; The first flow rate is equal to the sum of the second flow rate and the third flow rate.

2. A thermal management system for a new energy vehicle according to claim 1, It is characterized in that Also includes: A third cooling branch (6), the third cooling branch (6) having a fifth input end and a fifth output end; The fifth input end is connected to the first output end; the fifth output end is connected to the first input end; the third cooling branch (6) includes a second component to be cooled; the third cooling branch (6) has a fourth flow rate; The first flow rate is equal to the sum of the second flow rate, the third flow rate and the fourth flow rate.

3. A thermal management system for a new energy vehicle according to claim 2, Features: A second throttle valve (7) is also provided on the first cooling branch (2) between the first component to be cooled and the second output end; The second throttle valve (7) has a fifth flow rate, which is smaller than the second flow rate.

4. A thermal management system for a new energy vehicle according to any one of claim 3, Features: The first component to be cooled comprises: a power supply component (8) and a first drive motor (9) which are located between the third output end and the second output end and are connected in sequence.

5. A thermal management system for a new energy vehicle according to claim 2, Features: The second component to be cooled comprises: a range extender generator controller (10), a second drive motor (11) and a generator (12) which are located between the fifth input terminal and the fifth output terminal and are connected in sequence.

6. A thermal management system for a new energy vehicle according to claim 1, Features: The heat dissipation main circuit (1) comprises: a second water pump (16), a motor radiator (15), a temperature sensor (14), and a first water pump (13) which are sequentially connected in series.

7. A thermal management system for a new energy vehicle according to any one of claim 6, Features: The first water pump (13) has a sixth input end and a sixth output end, and the sixth output end is connected to the third input end and the fourth input end; The temperature sensor (14) has a seventh input end and a seventh output end, and the seventh output end is connected to the sixth input end; The motor radiator (15) has an eighth input end and an eighth output end, and the eighth output end is connected to the seventh input end; The second water pump (16) has a ninth input end and a ninth output end, the ninth output end is connected to the eighth input end, and the ninth input end is connected to the second output end and the fourth output end.

8. A thermal management system for a new energy vehicle according to claim 7, Features: The main heat dissipation circuit (1) further comprises: an expansion water tank (17) having a tenth input end and a tenth output end, the tenth input end being connected to the eighth output end, and the tenth output end being connected to the seventh input end.

9. A thermal management system for a new energy vehicle according to claim 4, Features: The first throttle valve (3) has a first inner diameter, and the second throttle valve (7) has a second inner diameter, and the first inner diameter is larger than the second inner diameter.

10. A new energy vehicle, It is characterized in that include: A thermal management system for a new energy vehicle as described in any one of claims 1 to 9.

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