Cooling system of new energy vehicle for motor driving system and new energy vehicle

Abstract

The utility model relates to a cooling system of a new energy vehicle for a motor driving system and the new energy vehicle, the motor driving system comprises a first motor and a gearbox oil tank, and the cooling system is used for exchanging heat with the first motor and the gearbox oil tank; the system is characterized in that the cooling system comprises a first motor cooling system and a first heat exchanger; the first motor cooling system is used for circularly cooling a cooling liquid of the first motor, an inlet of the first motor cooling system communicates with a cooling liquid outlet of the first motor, and an outlet communicates with a cooling liquid inlet of the first motor; the first heat exchanger is used for heating oil in the gearbox oil tank, one end of the first heat exchanger is communicated with the first motor cooling system, and the other end of the first heat exchanger is communicated with the first motor cooling system or output, so that high-temperature cooling liquid conveyed by the first motor cooling system exchanges heat with the oil in the gearbox oil tank. Oil in the gearbox oil tank is heated through high-temperature cooling liquid, viscosity is reduced, the temperature of the high-temperature cooling liquid is reduced, and refrigeration loads are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a cooling system for a new energy vehicle of a motor drive system and a new energy vehicle. Background Art

[0002] At present, in the motor cooling system of the electric drive system, the motor and the gearbox are independent systems. The current design has the following defects:

[0003] In cold regions, the oil temperature in the gearbox is relatively low and the viscosity is relatively high. The viscous lubricating oil will reduce the operating efficiency of the gearbox and cause abnormal wear of the gear shaft. The above problems need to be solved urgently. Summary of the Utility Model

[0004] The utility model discloses a cooling system for a new energy vehicle of a motor drive system and a new energy vehicle, aiming to solve the technical problems existing in the prior art.

[0005] The utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a cooling system for a new energy vehicle of a motor drive system. The motor drive system includes a first motor and a gearbox oil tank. The cooling system is used for heat exchange with the first motor and the gearbox oil tank. The cooling system includes a first motor cooling system and a first heat exchanger. The first motor cooling system is used for circulating and cooling the coolant of the first motor. The inlet of the first motor cooling system is connected to the coolant outlet of the first motor, and the outlet is connected to the coolant inlet of the first motor. The first heat exchanger is used for heating the oil in the gearbox oil tank, and one end is connected to the first motor cooling system, and the other end is connected to the first motor cooling system or externally output, so that the high-temperature coolant conveyed by the first motor cooling system exchanges heat with the oil in the gearbox oil tank.

[0007] In the cooling system for a new energy vehicle of a motor drive system of the utility model, the first motor cooling system includes a first conveying device, a first cooler and a first valve. The inlet of the first conveying device is connected to the coolant outlet of the first motor, and the outlet is connected to the hot medium inlet of the first heat exchanger and the inlet of the first valve. The hot medium outlet of the first heat exchanger is connected to the inlet of the first cooler or externally output. The outlet of the first valve is connected to the inlet of the first cooler. The outlet of the first cooler is connected to the coolant inlet of the first motor.

[0008] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the pressure drop of the coolant from the first heat exchanger to the inlet of the first cooler or for external output is greater than the pressure drop of the coolant from the first valve to the inlet of the first cooler.

[0009] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the first heat exchanger is a coil heat exchanger or a plate heat exchanger.

[0010] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the drive system further includes a second motor, and the cooling system further includes the second motor cooling system and a second heat exchanger; the inlet of the first motor cooling system is connected to the coolant outlets of the first motor and the second motor, and the outlet is connected to the coolant inlet of the first motor; the second motor cooling system is used to cool the coolant circulation of the second motor; and the inlet of the second motor cooling system is connected to the coolant outlets of the second motor and the first motor, and the outlet is connected to the coolant inlet of the second motor; the first heat exchanger is connected to the first motor cooling system and the second motor cooling system, so that the high-temperature coolant transported by the first motor cooling system enters the coolant inlet of the second motor after being cooled by the second motor cooling system; the second heat exchanger is used to heat the oil in the gearbox oil tank, and is connected to the second motor cooling system and the first motor cooling system, so that the high-temperature coolant transported by the second motor cooling system enters the coolant inlet of the first motor after being cooled by the first motor cooling system.

[0011] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the second motor cooling system includes a second conveying device, a second cooler and a second valve; the inlet of the second conveying device is connected to the coolant outlets of the second motor and the first motor, and the outlet is connected to the inlet of the heat medium of the second heat exchanger and the inlet of the second valve; the outlet of the heat medium of the second heat exchanger is connected to the inlet of the first cooler of the first motor cooling system; the outlet of the second valve is connected to the inlet of the second cooler; the outlet of the second cooler is connected to the coolant inlet of the second motor.

[0012] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the pressure drop of the coolant from the second heat exchanger to the coolant outlet of the first motor is greater than the pressure drop of the coolant from the second valve to the coolant outlet of the second motor.

[0013] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, the second heat exchanger is a coil heat exchanger or a plate heat exchanger.

[0014] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, an oil sump is further included; the inlet of the oil sump is communicated with the coolant outlet of the first motor, and the outlet is communicated with the inlet of the first motor cooling system.

[0015] In the cooling system of the new energy vehicle for the motor drive system of the present utility model, a filter is further included; the inlet of the filter is communicated with the coolant outlet of the first motor, and the outlet is communicated with the inlet of the first motor cooling system.

[0016] In a second aspect, the present utility model further provides a new energy vehicle, which includes the cooling system of the new energy vehicle for the motor drive system described in any one of the above.

[0017] The technical solution adopted by the present utility model can achieve the following beneficial effects:

[0018] The present utility model mainly provides a cooling system for a new energy vehicle for a motor drive system. Based on the first motor cooling system, the coolant of the first motor is circulated and cooled, and the oil in the gearbox oil tank is heated by the first heat exchanger. The high-temperature coolant heats the oil in the gearbox oil tank, reduces the viscosity, improves the operating efficiency of the gearbox, reduces abnormal wear, and reduces the temperature of the high-temperature coolant, reduces the refrigeration load, and does not increase additional energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. These drawings form a part of the present utility model. The schematic embodiments of the present utility model and their descriptions explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1 is one of the structural schematic diagrams of the cooling system of the new energy vehicle for the motor drive system of the present utility model;

[0021] Figure 2 is the second structural schematic diagram of the cooling system of the new energy vehicle for the motor drive system of the present utility model;

[0022] Figure 3 is the schematic diagram of the coolant flow direction of the cooling system of the new energy vehicle for the motor drive system of the present utility model under the heating condition;

[0023] Figure 4 is the schematic diagram of the coolant flow direction of the cooling system of the new energy vehicle for the motor drive system of the present utility model under the normal driving condition;

[0024] Figure 5Schematic diagram of coolant flow when the cooling system of a new energy vehicle for a motor drive system according to the present utility model is in a failure condition of the first motor cooling system or the second motor cooling system;

[0025] Figure 6 Schematic diagram of coolant flow when the cooling system of a new energy vehicle for a motor drive system according to the present utility model is in a strong cooling condition.

[0026] Explanation of reference numerals:

[0027] 1. First motor cooling system; 11. First conveying device; 12. First cooler; 13. First valve; 2. Second motor cooling system; 21. Second conveying device; 22. Second cooler; 23. Second valve; 3. First heat exchanger; 4. Second heat exchanger; 5. Oil sump; 6. Filter; A. First motor; B. Second motor; C. Gearbox oil tank. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments of the present utility model and the corresponding drawings. In the description of the present utility model, it should be noted that the term "or" is generally used in the sense of including "and / or" unless otherwise clearly specified in the content.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly defined 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, a magnetic connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly specifically limited.

[0030] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] To solve the problems existing in the prior art, the embodiments of the present application provide a cooling system and a new energy vehicle for a motor drive system of a new energy vehicle.

[0032] Example 1

[0033] This embodiment provides a cooling system for a new energy vehicle with an electric motor drive system. The electric motor drive system includes a first motor A and a transmission oil tank C. The cooling system is used for heat exchange with the first motor A and the transmission oil tank C; as Figure 1 shown, the cooling system includes a first motor cooling system 1 and a first heat exchanger 3; the first motor cooling system 1 is used for circulating and cooling the coolant of the first motor A, and the inlet of the first motor cooling system 1 is connected to the coolant outlet of the first motor A, and the outlet is connected to the coolant inlet of the first motor A; the first heat exchanger 3 is used for heating the oil in the transmission oil tank C, and one end is connected to the first motor cooling system 1, and the other end is connected to the first motor cooling system 1 or externally output, so that the high-temperature coolant transported by the first motor cooling system 1 exchanges heat with the oil in the transmission oil tank C.

[0034] A cooling system for a new energy vehicle with an electric motor drive system according to the present invention circulates and cools the coolant of the first motor A based on the first motor cooling system 1 and heats the oil in the transmission oil tank C with the first heat exchanger 3. The high-temperature coolant heats the oil in the transmission oil tank C, reduces the viscosity, improves the operating efficiency of the transmission, reduces abnormal wear, and reduces the temperature of the high-temperature coolant, reduces the refrigeration load, and does not increase additional energy consumption.

[0035] In some preferred embodiments, the first motor cooling system 1 includes a first conveying device 11, a first cooler 12 and a first valve 13; the inlet of the first conveying device 11 is connected to the coolant outlet of the first motor A, and the outlet is connected to the heat medium inlet of the first heat exchanger 3 and the inlet of the first valve 13; the heat medium outlet of the first heat exchanger 3 is connected to the inlet of the first cooler 12 or externally output; the outlet of the first valve 13 is connected to the inlet of the first cooler 12; the outlet of the first cooler 12 is connected to the coolant inlet of the first motor A; based on the setting of the first valve 13, it is possible to control whether to cool the first motor A, that is, the coolant flows through the first motor A or all flows into the first heat exchanger 3. In this way, if all the high-temperature coolant flows through the first heat exchanger 3, the heating effect on the oil in the transmission oil tank C can be improved, which is more suitable for quickly heating the transmission oil when the vehicle starts and heating the transmission oil in cold regions. That is, by switching the opening state of the first valve 13, it can adapt to different working conditions; specifically, the first conveying device 11 is an oil pump, and the first cooler 12 exchanges heat with the high-temperature coolant through the water circuit of the vehicle to reduce the coolant temperature.

[0036] In some preferred embodiments, the pressure drop of the coolant from the first heat exchanger 3 to the inlet of the first cooler 12 or for external transportation is greater than the pressure drop of the coolant from the first valve 13 to the port of the first cooler 12. Based on this setting, when the first valve 13 is opened, more coolant flows through the first valve 13, thereby reducing the flow rate of the high-temperature coolant flowing through the first heat exchanger 3, avoiding overheating of the transmission oil tank C, and reducing the load on the first conveying device 11.

[0037] Preferably, the first heat exchanger 3 is a coil heat exchanger or a plate heat exchanger, immersed in the oil in the transmission oil tank C. More preferably, it is a heat exchanger made of copper material to obtain a relatively large pressure drop while ensuring the heat transfer area, so that when the first valve 13 is opened, more coolant flows through the first valve 13, reducing the load on the first conveying device 11.

[0038] In some preferred embodiments, as Figure 2 shown, the drive system further includes a second motor B, that is, a dual-motor drive system at this time. The cooling system further includes a second motor B oil cooling system and a second heat exchanger 4. The inlet of the first motor cooling system 1 is connected to the coolant outlets of the first motor A and the second motor B, and the outlet is connected to the coolant inlet of the first motor A. The second motor B oil cooling system is used to circulate and cool the coolant of the second motor B. And the inlet of the second motor B oil cooling system is connected to the coolant outlets of the second motor B and the first motor A, and the outlet is connected to the coolant inlet of the second motor B. The first heat exchanger 3 is connected to the first motor cooling system 1 and the second motor B oil cooling system, so that the high-temperature coolant transported by the first motor cooling system 1 enters the coolant inlet of the second motor B after being cooled by the second motor B oil cooling system. The second heat exchanger 4 is used to heat the oil in the transmission oil tank C and is connected to the second motor B oil cooling system and the first motor cooling system 1, so that the high-temperature coolant transported by the second motor B oil cooling system enters the coolant inlet of the first motor A after being cooled by the first motor cooling system 1. Based on the first motor cooling system 1 circulating and cooling the coolant of the first motor A, the second motor cooling system 2 circulating and cooling the coolant of the second motor B, and the first heat exchanger 3 and the second heat exchanger 4 being respectively connected to the first motor cooling system 1 and the second motor cooling system 2. On the one hand, the high-temperature coolant heats the oil in the transmission oil tank C, reduces the viscosity, improves the operating efficiency of the transmission, reduces abnormal wear, and reduces the temperature of the high-temperature coolant, reduces the refrigeration load, and does not increase additional energy consumption. On the other hand, both the first motor cooling system 1 and the second motor cooling system 2 can cool the first motor A and the second motor B, serving as backups for each other to ensure that the vehicle can drive normally when any one fails. On the third hand, when both the first motor cooling system 1 and the second motor cooling system 2 are operating, it can improve the cooling effect on the first motor A or the second motor B, meeting the requirements of the forced cooling working conditions.

[0039] In some preferred embodiments, the second motor B oil cooling system includes a second conveying device 21, a second cooler 22, and a second valve 23; the inlet of the second conveying device 21 is connected to the coolant outlets of the second motor B and the first motor A, and the outlet is connected to the hot medium inlet of the second heat exchanger 4 and the inlet of the second valve 23; the hot medium outlet of the second heat exchanger 4 is connected to the inlet of the first cooler 12 of the first motor cooling system 1; the outlet of the second valve 23 is connected to the inlet of the second cooler 22; the outlet of the second cooler 22 is connected to the coolant inlet of the second motor B; based on the setting of the second valve 23, it is possible to control whether to cool the second motor B, that is, the coolant flows through the second motor B or all flows through the second heat exchanger 4 and into the first motor A. With this setting, on the one hand, the cooling effect on the first motor A can be improved, that is, it is more suitable for working conditions that require strong cooling. On the other hand, when all the high-temperature coolant flows through the second heat exchanger 4, the heating effect on the oil in the transmission oil tank C can be improved, which is more suitable for quickly heating the transmission oil when starting the vehicle and heating the transmission oil in cold regions. That is, by switching the opening state of the second valve 23, it can adapt to different working conditions; specifically, the second conveying device 21 is an oil pump, and the second cooler 22 exchanges heat with the high-temperature coolant through the water circuit of the vehicle to reduce the coolant temperature.

[0040] In some preferred embodiments, the pressure drop of the coolant from the second heat exchanger 4 to the coolant outlet of the first motor A is greater than the pressure drop of the coolant from the second valve 23 to the coolant outlet of the second motor B; based on this setting, when the second valve 23 is opened, more coolant flows through the second valve 23, thereby reducing the flow rate of the high-temperature coolant flowing through the second heat exchanger 4, avoiding overheating of the transmission oil tank C, and reducing the load of the second conveying device 21; correspondingly, the pressure drop of the coolant from the first heat exchanger 3 to the coolant outlet of the second motor B is greater than the pressure drop of the coolant from the first valve 13 to the coolant outlet of the first motor A.

[0041] Preferably, the second heat exchanger 4 is a coil heat exchanger or a plate heat exchanger, immersed in the oil in the transmission oil tank C. More preferably, it is a heat exchanger made of copper material to obtain a large pressure drop while ensuring the heat exchange area, so that when the second valve 23 is opened, more coolant flows through the second valve 23, reducing the load of the second conveying device 21.

[0042] In some preferred embodiments, an oil collecting box 5 is further included; the inlet of the oil collecting box 5 is connected to the coolant outlet of the first motor A, and the outlet is connected to the inlet of the first motor cooling system 1; when the drive system is a dual-motor drive, at this time, the inlet of the oil collecting box 5 is connected to the coolant outlets of the first motor A and the second motor B, and the outlet is connected to the inlets of the first motor cooling system 1 and the second motor cooling system 2; based on the setting of the oil collecting box 5, the coolant is cached to maintain stable oil supply.

[0043] In some preferred embodiments, a filter 6 is further included; the inlet of the filter 6 is connected to the coolant outlet of the first motor A, and the outlet is connected to the inlet of the first motor cooling system 1; when the drive system is a dual-motor drive, at this time, the inlet of the oil collecting box 5 is connected to the coolant outlets of the first motor A and the second motor B, and the outlet is connected to the inlets of the first motor cooling system 1 and the second motor cooling system 2; based on the filtration of the coolant by the filter 6, the cooling effect is prevented from being affected.

[0044] The operation method of the cooling system for a new energy vehicle with a motor drive system of the present invention will be described below in combination with specific application scenarios, specifically in combination with the usage scenario of a dual-motor drive.

[0045] 1. Heating conditions where heating efficiency needs to be improved, such as when the vehicle transmission oil temperature is low and heating is required, are called heating conditions. In this condition, the first motor cooling system 1 and / or the second motor cooling system 2 operates. Taking the operation of the first motor cooling system 1 as an example, as Figure 3 , the first valve 13 is in the closed state, and all the coolant conveyed by the first conveying device 11 enters the first heat exchanger 3 to heat the oil in the transmission oil tank C, so as to quickly raise the temperature of the oil or maintain an appropriate working temperature; when the second motor cooling system 2 operates alone, the working state is opposite, which will not be elaborated.

[0046] 2. The condition of normal vehicle driving. In this condition, the oil in the transmission oil tank C reaches the efficient temperature and no longer needs to be heated. Taking the operation of the first motor cooling system 1 as an example: as Figure 4 , after passing through the first conveying device 11, the coolant is divided into two paths. One path passes through the first valve 13 and the first cooler 12 and then enters the first motor A, and the other path passes through the first heat exchanger 3 and then enters the second motor B after passing through the second cooler 22. When the second motor cooling system 2 operates alone, it is opposite to the first motor cooling system 1 and will not be elaborated. At this time, most of the coolant will preferentially flow through the branch of the first valve 13. Such a design will not cause excessive heating of the transmission oil tank first, and secondly reduces the power consumption of the first conveying device 11.

[0047] 3. The operating condition where the first motor cooling system 1 or the second motor cooling system 2 works independently to cope with the failure of one of the conveying devices. For example, when the second conveying device 21 is damaged, the first motor cooling system 1 works. As Figure 5 , the coolant is divided into two paths after passing through the first conveying device 11. One path passes through the first valve 13 and the first cooler 12 and then enters the first motor A to cool the first motor A. The other path passes through the first heat exchanger 3 and then enters the second cooler 22 and then enters the second motor B to cool the second motor B, meeting the low-power driving of the vehicle. When the first conveying device 11 is damaged, the working state is opposite, which will not be elaborated.

[0048] 4. The operating condition where the first motor A or the second motor B needs strong cooling. For example, when the first motor A is overheated and more coolant is needed for cooling. As Figure 6 , the first conveying device 11 and the second conveying device 21 are turned on simultaneously, the first valve 13 is opened and the second valve 23 is closed, so as to pump more coolant through the second conveying device 21 to the first motor A through the second heat exchanger 4 and merge with the coolant pumped by the first conveying device 11, increasing the coolant volume for cooling the first motor A and realizing strong cooling of the first motor A. When the second motor B needs strong cooling, the working state is opposite, which will not be elaborated.

[0049] Embodiment 2

[0050] This embodiment provides a new energy vehicle, which includes the cooling system for the new energy vehicle of the motor drive system in the above Embodiment 1.

[0051] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims, and all of them belong to the protection scope of the present invention.

Claims

1. A cooling system for a new energy vehicle with an electric motor drive system, the electric motor drive system including a first electric motor and a gearbox oil tank, the cooling system being used for heat exchange with the first electric motor and the gearbox oil tank; characterized in that, The cooling system includes a first motor cooling system and a first heat exchanger; The first motor cooling system is used to cool the coolant circulated by the first motor, and the inlet of the first motor cooling system is connected to the coolant outlet of the first motor, and the outlet is connected to the coolant inlet of the first motor; The first heat exchanger is used to heat the oil in the transmission oil tank, and one end is connected to the first motor cooling system, and the other end is connected to the first motor cooling system or externally output, so that the high-temperature coolant transported by the first motor cooling system exchanges heat with the oil in the transmission oil tank.

2. The cooling system for a new energy vehicle used in a motor drive system according to claim 1, characterized in that, The first motor cooling system includes a first conveying device, a first cooler and a first valve; The inlet of the first conveying device is connected to the coolant outlet of the first motor, and the outlet is connected to the heat medium inlet of the first heat exchanger and the inlet of the first valve; The heat medium outlet of the first heat exchanger is connected to the inlet of the first cooler or externally output; The outlet of the first valve is connected to the inlet of the first cooler; The outlet of the first cooler is connected to the coolant inlet of the first motor.

3. The cooling system for a new energy vehicle used in a motor drive system according to claim 2, wherein, The pressure drop of the coolant from the first heat exchanger to the inlet of the first cooler or externally output is greater than the pressure drop of the coolant from the first valve to the inlet of the first cooler.

4. The cooling system for a new energy vehicle used in a motor drive system according to any one of claims 1-3, characterized in that, The first heat exchanger is a coil heat exchanger or a plate heat exchanger.

5. The cooling system for a new energy vehicle used in a motor drive system according to claim 1, wherein, The drive system further includes a second motor, and the cooling system further includes a second motor cooling system and a second heat exchanger; The inlet of the first motor cooling system is connected to the coolant outlets of the first motor and the second motor, and the outlet is connected to the coolant inlet of the first motor; The second motor cooling system is used to cool the coolant circulated by the second motor; and the inlet of the second motor cooling system is connected to the coolant outlets of the second motor and the first motor, and the outlet is connected to the coolant inlet of the second motor; The first heat exchanger is connected to the first motor cooling system and the second motor cooling system, so that the high-temperature coolant transported by the first motor cooling system enters the coolant inlet of the second motor after being cooled by the second motor cooling system; The second heat exchanger is used to heat the oil in the transmission oil tank, and is connected to the second motor cooling system and the first motor cooling system, so that the high-temperature coolant transported by the second motor cooling system enters the coolant inlet of the first motor after being cooled by the first motor cooling system.

6. The cooling system for a new energy vehicle used in a motor drive system according to claim 5, characterized in that, The second motor cooling system includes a second conveying device, a second cooler and a second valve; The inlet of the second conveying device is connected to the coolant outlets of the second motor and the first motor, and the outlet is connected to the heat medium inlet of the second heat exchanger and the inlet of the second valve; The heat medium outlet of the second heat exchanger is connected to the inlet of the first cooler of the first motor cooling system; The outlet of the second valve is connected to the inlet of the second cooler; The outlet of the second cooler is connected to the coolant inlet of the second motor.

7. The cooling system for a new energy vehicle used in a motor drive system according to claim 6, characterized in that, The pressure drop of the coolant from the second heat exchanger to the coolant outlet of the first motor is greater than the pressure drop of the coolant from the second valve to the coolant outlet of the second motor.

8. The cooling system for a new energy vehicle used in a motor drive system according to any one of claims 5-7, characterized in that, The second heat exchanger is a coil heat exchanger or a plate heat exchanger.

9. The cooling system for a new energy vehicle used in a motor drive system according to claim 1, characterized in that, It further includes an oil sump; the inlet of the oil sump is connected to the coolant outlet of the first motor, and the outlet is connected to the inlet of the first motor cooling system.

10. The cooling system for a new energy vehicle used in a motor drive system according to claim 1, characterized in that, It further includes a filter. The inlet of the filter is connected to the coolant outlet of the first motor, and the outlet is connected to the inlet of the first motor cooling system.

11. A new energy vehicle, characterized in that, It includes the cooling system for a new energy vehicle with a motor drive system according to any one of claims 1-10 above.

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