Thermal management system of oil-cooled electric drive assembly and vehicle comprising same

Abstract

The utility model provides a thermal management system of an oil cooling electric drive assembly and a vehicle comprising the thermal management system. The thermal management system of the oil cooling electric drive assembly comprises an oil pump, a control valve, a heat exchanger, a bypass oil way and a cooling oil way. The two ends of the oil pump are connected to the cooling oil way and the control valve respectively, the heat exchanger is connected with the bypass oil way in parallel, the heat exchanger and one end of the bypass oil way are connected to the control valve, the control valve controls lubricating oil pumped by the oil pump to flow through the heat exchanger or the bypass oil way, and the other end of the heat exchanger and the other end of the bypass oil way are connected to the cooling oil way. The cooling oil way is communicated with the electric driving assembly; wherein the control valve and the bypass oil way are both arranged on the heat exchanger, so that the control valve, the bypass oil way and the heat exchanger are integrated into a whole. The problems that the oil pump load is increased and the operation efficiency of the electric drive assembly is reduced due to the fact that the temperature of lubricating oil in the electric drive assembly cannot be accurately controlled are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle thermal management, and in particular relates to a thermal management system of an oil-cooled electric drive assembly and a vehicle comprising the same. Background Art

[0002] The oil-cooled electric drive system uses lubricating oil to cool the motors, bearings, gears and other components of the electric drive system. In the prior art, the lubricating oil must pass through a heat exchanger in the circulating oil circuit. However, when the lubricating oil is at a low temperature, the viscosity of the lubricating oil is high, the oil pump is difficult to start, and the energy consumption of the oil pump is very large. In addition, when the coolant temperature of the vehicle is not high and the vehicle power requirements are not high, the oil temperature in the circulating oil circuit will be lowered by the coolant, and the viscosity of the lubricating oil changes inversely proportional to the oil temperature. If the oil temperature of the lubricating oil is too low, its viscosity will be too high, thereby reducing the operating efficiency of the electric drive assembly. Utility Model Content

[0003] The utility model provides a thermal management system of an oil-cooled electric drive assembly and a vehicle comprising the same, so as to solve the problem that the temperature of lubricating oil in the electric drive assembly cannot be accurately controlled, resulting in increased oil pump load and reduced operating efficiency of the electric drive assembly.

[0004] In order to solve or improve the above technical problems to a certain extent, according to the utility model, a thermal management system of an oil-cooled electric drive assembly is provided, characterized in that it includes: an oil pump, a control valve, a heat exchanger, a bypass oil circuit and a cooling oil circuit;

[0005] Wherein, the two ends of the oil pump are respectively connected to the cooling oil circuit and the control valve, the heat exchanger is connected in parallel with the bypass oil circuit, one end of the heat exchanger and the bypass oil circuit is connected to the control valve, the control valve controls the lubricating oil extracted by the oil pump to flow through the heat exchanger or the bypass oil circuit, the other end of the heat exchanger and the bypass oil circuit is connected to the cooling oil circuit, and the cooling oil circuit is connected to the electric drive assembly;

[0006] Wherein, the control valve and the bypass oil circuit are both arranged on the heat exchanger to integrate the control valve, the bypass oil circuit and the heat exchanger into one.

[0007] In some embodiments, the control valve is disposed outside the shell of the heat exchanger, and the bypass oil circuit is disposed inside the shell of the heat exchanger.

[0008] In some embodiments, the control valve is a solenoid valve.

[0009] In some embodiments, there are multiple cooling oil circuits, the multiple cooling oil circuits are arranged in parallel, and the multiple cooling oil circuits are respectively connected to different components of the electric drive assembly.

[0010] In some embodiments, among the plurality of cooling oil circuits, at least some of the cooling oil circuits have different cross-sectional areas.

[0011] In some embodiments, among the plurality of cooling oil circuits, at least some of the cooling oil circuits have oil inlets with different areas.

[0012] In some embodiments, a first filter device is provided between the cooling oil circuit and the oil pump to filter out particulate matter in the lubricating oil.

[0013] In some embodiments, the first filtering device is disposed on the oil pump to be integrated with the oil pump.

[0014] In some embodiments, a second filter device is provided between the oil pump and the control valve to filter out particulate matter in the lubricating oil.

[0015] According to another aspect of the present invention, a vehicle is provided, comprising a thermal management system of the oil-cooled electric drive assembly as described in any one of the above embodiments.

[0016] The thermal management system of the oil-cooled electric drive assembly of the utility model adds a bypass oil circuit arranged in parallel with the heat exchanger, and controls the flow of lubricating oil through the heat exchanger or the bypass oil circuit through a control valve, so that the thermal management system can select different lubricating oil flow paths according to different working conditions, thereby achieving precise control of the temperature of the lubricating oil under different working conditions, thereby reducing the load of the oil pump, improving the reliability and service life of the oil pump, and can effectively improve the operating efficiency of the electric drive system and increase the vehicle's cruising range.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic block diagram of a thermal management system of an oil-cooled electric drive assembly according to an embodiment of the utility model;

[0019] Figure 2 A schematic block diagram of a thermal management system of an oil-cooled electric drive assembly according to another embodiment of the utility model;

[0020] Figure 3 This is a schematic structural diagram of a heat exchanger according to another embodiment of the present invention.

[0021]

Explanation of symbols

[0022] 10. Oil pump

[0023] 20. Control valve

[0024] 30. Heat exchanger

[0025] 40. Bypass oil circuit

[0026] 50. Cooling oil circuit

[0027] 501. Stator oil circuit

[0028] 502. Rotor oil circuit

[0029] 503, bearing oil circuit

[0030] 504, gear shaft oil circuit

[0031] 60. Lubricating oil pool

[0032] 70. First filtration device

[0033] 80. Second filtration device

[0034] 100. Stator

[0035] 200. Rotor

[0036] 300. Bearings

[0037] 400, gear shaft DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation and effects of a thermal management system of an oil-cooled electric drive assembly and a vehicle including the same proposed by the present invention in combination with the accompanying drawings and preferred embodiments.

[0039] According to an embodiment of the utility model, a thermal management system for an oil-cooled electric drive assembly is provided, such as Figure 1 As shown, it includes: an oil pump 10 , a control valve 20 , a heat exchanger 30 , a bypass oil circuit 40 and a cooling oil circuit 50 .

[0040] The two ends of the oil pump 10 are respectively connected to the cooling oil circuit 50 and the control valve 20 to provide power for the flow of lubricating oil in the thermal management system of the oil-cooled electric drive assembly.

[0041] Specifically, the oil inlet of the oil pump 10 is connected to the cooling oil circuit 50 , and the oil outlet is connected to the control valve 20 .

[0042] In one embodiment, if Figure 2As shown, the thermal management system of the oil-cooled electric drive assembly also includes a lubricating oil pool 60 to collect the lubricating oil of the thermal management system. The cooling oil circuit 50 is connected to the lubricating oil pool 60, and the oil inlet of the oil pump 10 is connected to the lubricating oil pool 60 to extract the lubricating oil in the lubricating oil pool 60 to realize the circulation of the lubricating oil.

[0043] like Figure 1 and Figure 2 As shown, the heat exchanger 30 is connected in parallel with the bypass oil circuit 40, and the oil inlets of the heat exchanger 30 and the bypass oil circuit 40 are both connected to the control valve 20, and the oil outlets of the heat exchanger 30 and the bypass oil circuit 40 are connected to the cooling oil circuit 50. In the thermal management system of the oil-cooled electric drive assembly, by controlling the operation of the control valve 20, the oil pump 10 and the heat exchanger 30 can be selectively connected, or the oil pump 10 and the bypass oil circuit 40 can be connected.

[0044] The heat exchanger 30 includes a lubricating oil chamber for the lubricating oil to flow through and a cooling liquid chamber for the coolant to flow through, so that heat is exchanged between the coolant flowing through the cooling liquid chamber and the lubricating oil flowing through the lubricating oil chamber, thereby reducing the temperature of the lubricating oil in the electric drive assembly.

[0045] In one embodiment, based on different vehicle operating conditions, the path through which the lubricating oil flows is switched by controlling the valve 20, as follows:

[0046] Working condition 1

[0047] When the ambient temperature is low, the control valve 20 is activated to connect the oil pump 10 with the bypass oil circuit 40, so that the lubricating oil does not flow through the heat exchanger 30 for heat exchange. Because the lower the temperature of the lubricating oil, the higher its viscosity. When the ambient temperature is low, the viscosity of the lubricating oil is high. If the lubricating oil flows through the heat exchanger 30, the flow resistance of the lubricating oil in the thermal management system of the oil-cooled electric drive assembly will increase. Therefore, when the ambient temperature is low, the control valve 20 controls the lubricating oil not to flow through the heat exchanger 30, which greatly reduces the flow resistance of the lubricating oil, making it easier to start the oil pump 10, and reducing the load of the oil pump 10 and the energy consumption of the whole vehicle.

[0048] Working condition 2

[0049] Under some characteristic working conditions, such as the initial stage of vehicle startup, the control valve 20 is actuated to connect the oil pump 10 with the bypass oil circuit 40, so that the lubricating oil does not flow through the heat exchanger 30 for heat exchange. Because the lower the temperature of the lubricating oil, the higher its viscosity. In the initial stage of vehicle startup, the viscosity of the lubricating oil is relatively high. If the lubricating oil flows through the heat exchanger 30, the viscosity of the lubricating oil in the thermal management system of the oil-cooled electric drive assembly will be too high, affecting the operating efficiency of the electric drive system. Therefore, in the initial stage of vehicle startup, the control valve 20 is used to control the lubricating oil not to flow through the heat exchanger 30, so that the temperature of the lubricating oil can be quickly raised to a reasonable range, thereby improving the operating efficiency of the electric drive system and the vehicle's cruising range.

[0050] Working condition three

[0051] When the temperature of the lubricating oil in the thermal management system of the oil-cooled electric drive assembly is high, for example, after the vehicle has been running for a period of time, the heat generated by the operation of the electric drive assembly causes the temperature of the lubricating oil to rise, and the control valve 20 is actuated to connect the oil pump 10 and the heat exchanger 30, so that the lubricating oil flows through the heat exchanger 30 for heat exchange, thereby reducing the temperature of the lubricating oil, and then cooling the various components of the electric drive system to avoid high-temperature failure of the electric drive system.

[0052] In one embodiment, the control valve 20 is a solenoid valve, which has the advantages of quick response, low power consumption, reliable operation and low cost.

[0053] like Figure 3 As shown, the heat exchanger 30, the control valve 20 and the bypass oil circuit 40 of the utility model are integrated into one body to reduce the number of interfaces of components and the number of assembled parts of the thermal management system of the oil-cooled electric drive assembly, thereby reducing the cost of parts and the cost of assembly, and effectively reducing the volume of the thermal management system of the oil-cooled electric drive assembly, thereby facilitating the arrangement of the thermal management system of the oil-cooled electric drive assembly in the whole vehicle.

[0054] Alternatively, if Figure 3 As shown, the control valve 20 is connected to the outer side of the shell of the heat exchanger 30. The control valve 20 can be fixedly connected to the outer side of the shell of the heat exchanger 30 by welding, or can be detachably connected to the outer side of the shell of the heat exchanger 30, so as to facilitate the maintenance and replacement of the control valve 20 after a failure. The bypass oil circuit 40 is arranged inside the shell of the heat exchanger 30.

[0055] like Figure 1 and Figure 2 As shown, one end of the cooling oil circuit 50 is connected to the heat exchanger 30 and the bypass oil circuit 40, and the other end is connected to the lubricating oil pool 60 or the oil pump 10. The cooling oil circuit 50 is connected to the components of the electric drive assembly to introduce the lubricating oil into the electric drive assembly to lubricate the electric drive assembly and absorb the heat generated when the electric drive assembly is running.

[0056] In one embodiment, there are multiple cooling oil circuits 50 , which are arranged in parallel. One end of each of the cooling oil circuits 50 is connected to the heat exchanger 30 and the bypass oil circuit 40 , and the other end is connected to the lubricating oil pool 60 or the oil pump 10 .

[0057] The plurality of cooling oil circuits 50 are respectively connected to different components of the electric drive assembly to achieve distribution of lubricating oil.

[0058] Alternatively, if Figure 1 and Figure 2The cooling oil circuit 50 includes a stator oil circuit 501, a rotor oil circuit 502, a bearing oil circuit 503 and a gear shaft oil circuit 504, which are respectively connected to the stator 100, the rotor 200, the bearing 300 and the gear shaft 400 of the electric drive assembly to lubricate and cool the stator 100, the rotor 200, the bearing 300 and the gear shaft 400.

[0059] In one embodiment, among the multiple cooling oil circuits 50, at least some of the cooling oil circuits 50 have different cross-sectional areas, that is, among the multiple oil circuits, at least some of the cooling oil circuits 50 have different pipe diameters. In this embodiment, by setting at least some of the cooling oil circuits 50 to have different pipe diameters, different distribution of lubricating oil can be achieved through the pipe diameters of the cooling oil circuits 50, so as to meet the different requirements of different components of the electric drive system for lubricating oil, thereby achieving accurate distribution of lubricating oil and effectively reducing the flow resistance of the lubricating oil.

[0060] Optionally, among the multiple cooling oil circuits 50, at least some of the cooling oil circuits 50 have different oil inlet areas, wherein the oil inlet is an opening of the cooling oil circuit 50 connecting the heat exchanger 30 and the bypass oil circuit 40. By setting the oil inlet to have different areas, different controls on the flow of the cooling oil circuit 50 can be achieved, thereby meeting different requirements of the components of the electric drive system for the flow of lubricating oil.

[0061] In one embodiment, if Figure 1 As shown, a first filter device 70 is provided between the cooling oil circuit 50 and the oil pump 10 , so as to filter out larger particles in the lubricating oil through the first filter device 70 , thereby preventing the larger particles in the lubricating oil from damaging the oil pump 10 .

[0062] like Figure 2 As shown, when a lubricating oil pool 60 is provided in the thermal management system of the oil-cooled electric drive assembly, the first filter device 70 is provided between the lubricating oil pool 60 and the oil pump 10 .

[0063] Optionally, the first filter device 70 is disposed on the oil pump 10, and the oil pump 10 and the first filter device 70 are integrated into one body, so as to reduce the number of component interfaces, thereby reducing the cost of parts and assembly costs.

[0064] In one embodiment, if Figure 1 and Figure 2 As shown, a second filter device 80 is provided between the oil pump 10 and the control valve 20 to filter out smaller particles in the lubricating oil, so as to prevent the particles in the lubricating oil from damaging the components in the electric drive assembly.

[0065] Another embodiment of the present invention provides a vehicle, which includes the thermal management system of the oil-cooled electric drive assembly of any of the above embodiments.

[0066] The thermal management system of the oil-cooled electric drive assembly of the utility model adds a bypass oil circuit arranged in parallel with the heat exchanger, and controls the flow of lubricating oil through the heat exchanger or the bypass oil circuit through a control valve, so that the thermal management system can select different lubricating oil flow paths according to different working conditions, thereby achieving precise control of the temperature of the lubricating oil under different working conditions, thereby reducing the load of the oil pump, improving the reliability and service life of the oil pump, and can effectively improve the operating efficiency of the electric drive system and increase the vehicle's cruising range.

[0067] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A thermal management system for an oil-cooled electric drive assembly, characterized in that: include: Oil pump, control valve, heat exchanger, bypass oil circuit and cooling oil circuit; Wherein, the two ends of the oil pump are respectively connected to the cooling oil circuit and the control valve, the heat exchanger is connected in parallel with the bypass oil circuit, one end of the heat exchanger and the bypass oil circuit is connected to the control valve, the control valve controls the lubricating oil extracted by the oil pump to flow through the heat exchanger or the bypass oil circuit, the other end of the heat exchanger and the bypass oil circuit is connected to the cooling oil circuit, and the cooling oil circuit is connected to the electric drive assembly; Wherein, the control valve and the bypass oil circuit are both arranged on the heat exchanger to integrate the control valve, the bypass oil circuit and the heat exchanger into one.

2. The thermal management system of the oil-cooled electric drive assembly according to claim 1, characterized in that: The control valve is arranged outside the shell of the heat exchanger, and the bypass oil circuit is arranged inside the shell of the heat exchanger.

3. The thermal management system of the oil-cooled electric drive assembly according to claim 1 or 2, characterized in that: The control valve is a solenoid valve.

4. The thermal management system of the oil-cooled electric drive assembly according to claim 1, characterized in that: There are multiple cooling oil circuits, and the multiple cooling oil circuits are arranged in parallel, and the multiple cooling oil circuits are respectively connected to different components of the electric drive assembly.

5. The thermal management system of the oil-cooled electric drive assembly according to claim 4, characterized in that: Among the plurality of cooling oil passages, at least some of the cooling oil passages have different cross-sectional areas.

6. The thermal management system of the oil-cooled electric drive assembly according to claim 4 or 5, characterized in that: Among the plurality of cooling oil circuits, at least some of the cooling oil circuits have oil inlet areas that are different.

7. The thermal management system of the oil-cooled electric drive assembly according to claim 1, characterized in that: A first filter device is provided between the cooling oil circuit and the oil pump to filter out particulate matter in the lubricating oil.

8. The thermal management system of the oil-cooled electric drive assembly according to claim 7, characterized in that: The first filtering device is arranged on the oil pump to be integrated with the oil pump.

9. The thermal management system of the oil-cooled electric drive assembly according to claim 1, characterized in that: A second filter device is provided between the oil pump and the control valve to filter out particulate matter in the lubricating oil.

10. A vehicle, characterized in that: A thermal management system comprising the oil-cooled electric drive assembly according to any one of claims 1-9.

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