Electrically-driven cooling system and vehicle

Abstract

The utility model relates to the technical field of electric drive heat dissipation, and discloses an electric drive cooling system and a vehicle. The first filtering part is arranged in the first filtering oil way and is provided with a filter screen for filtering impurities in the cooling oil; the first end of the flushing oil way communicates with the oil pan, and the second end of the flushing oil way communicates with one end of the first filtering oil way; when the cooling oil is guided into the first filtering oil way through the flushing oil way, the first filtering oil way and the electric drive system are not communicated, and the cooling oil is guided into the oil pan through the first filtering oil way in the reverse direction so as to flush the filter screen. Therefore, through the arrangement of the flushing oil way, cooling oil in the oil pan can be guided into the first filtering oil way to flow reversely, so that the problem of blockage of the first filter is solved by flushing the first filter, the flow of the cooling oil entering the electric drive system is further guaranteed, and normal heat dissipation of the electric drive system is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive heat dissipation, and in particular to an electric drive cooling system and a vehicle. Background Art

[0002] Oil-cooled motors have good cooling performance and efficiency, which can effectively solve the disadvantages of water-cooled motors, reduce motor size, and increase power density. The oil pump in the oil cooling system will suck the cooling oil from the oil pan and pump it to the oil cooler. After being cooled by the oil cooler, it flows to the drive motor, bearings, gears and other parts that need cooling.

[0003] In the process of cooling oil flowing, in addition to taking away the heat generated by the motor, it also takes away the impurities generated by the operation of the mechanical structure and finally flows into the oil pan. When these impurities flow through the filter of the oil cooling system, they are easy to cause the filter screen to be blocked. When the filter screen is blocked, the cooling oil flow will be reduced, causing the drive motor to overheat, and in severe cases, the entire electric drive assembly will be damaged. Utility Model Content

[0004] In view of the above problems, an embodiment of the present application provides an electric drive cooling system and a vehicle, which can solve the clogging problem of the first filter by flushing the first filter, thereby ensuring the flow of cooling oil entering the electric drive system, so that the electric drive system can dissipate heat normally.

[0005] In a first aspect, the present application provides an electric drive cooling system, comprising: a first filter oil circuit, one end of which is connected to an oil pan, the first filter oil circuit being used to introduce cooling oil in the oil pan into an electric drive system to cool the electric drive system; a first filter element, arranged in the first filter oil circuit, the first filter element being provided with a filter screen for filtering impurities in the cooling oil; a flushing oil circuit, a first end of which is connected to the oil pan, the second end of the flushing oil circuit being connected to one end of the first filter oil circuit, so that the flushing oil circuit and the first filter oil circuit are connected in parallel; wherein, when the cooling oil is introduced into the electric drive system through the first filter oil circuit in a positive flow direction, the flushing oil circuit is not conductive; when the cooling oil is introduced into the first filter oil circuit through the flushing oil circuit, the first filter oil circuit and the electric drive system are not conductive, and the cooling oil is introduced into the oil pan through the first filter oil circuit in a reverse flow direction to flush the filter screen.

[0006] In some specific embodiments, a driving oil pump is provided in the first filter oil circuit, and the driving oil pump is used to drive the cooling oil in the first filter oil circuit to flow. When the driving oil pump rotates in the positive direction, the cooling oil is driven to flow in the positive direction, and when the driving oil pump rotates in the reverse direction, the cooling oil is driven to flow in the reverse direction.

[0007] In some specific embodiments, a first one-way valve is disposed in the flushing oil circuit, and the first one-way valve is turned on when the cooling oil is directed from the oil pan to the first filtering oil circuit.

[0008] In some specific embodiments, the electric drive cooling system includes a second filter oil circuit and a second one-way valve, the second one-way valve is arranged in the second filter oil circuit, and the second one-way valve is turned on when the cooling oil is guided from the first filter oil circuit to the second filter oil circuit.

[0009] In some specific embodiments, the electric drive cooling system includes a pressure differential sensor, which includes a first detection head and a second detection head. The first detection head is arranged on a side of the first filter element close to the oil pan, and the second detection head is arranged on a side of the first filter element away from the oil pan. The oil pump is driven to rotate in the opposite direction when the pressure differential sensor detects that the pressure differential on both sides of the first filter element is greater than a preset pressure differential.

[0010] In some specific embodiments, the electric drive cooling system further includes a vacuum sensor, which is disposed between the driving oil pump and the first filter element, and the driving oil pump is configured to rotate in the opposite direction when the vacuum sensor detects that the vacuum degree is greater than a preset vacuum degree.

[0011] In some specific embodiments, the electric drive cooling system includes a controller, which is connected to the driving oil pump and is also connected to a pressure difference sensor or a vacuum sensor; wherein the controller is used to control the driving oil pump to rotate in the opposite direction when the pressure difference sensor detects that the pressure difference on both sides of the first filter element is greater than a preset pressure difference, or when the vacuum sensor detects that the vacuum degree is greater than a preset vacuum degree.

[0012] In some specific embodiments, a second filter is provided in the flushing oil circuit, and the second filter is used to filter impurities in the cooling oil flowing from the oil pan to the first filter oil circuit.

[0013] In some specific embodiments, a third filter element and a third one-way valve are provided in the second filter oil circuit. The third one-way valve is connected in parallel with the third filter element. The third filter element is used to filter impurities in the cooling oil in the second filter oil circuit. The third one-way valve is used to introduce coolant into the electric drive system when the third filter element is blocked.

[0014] A second aspect of the present application provides a vehicle, comprising an electric drive cooling system as described in any one of the above items, wherein the electric drive cooling system is used to cool the electric drive system.

[0015] The present application has at least the following beneficial effects: based on the electric drive cooling system and vehicle provided by the present application, including: a first filter oil circuit, one end of which is connected to the oil pan, the first filter oil circuit is used to introduce the cooling oil in the oil pan into the electric drive system to cool the electric drive system; a first filter element is arranged in the first filter oil circuit, and the first filter element is provided with a filter screen for filtering impurities in the cooling oil; a flushing oil circuit, a first end of which is connected to the oil pan, and a second end of the flushing oil circuit is connected to one end of the first filter oil circuit, so that the flushing oil circuit and the first filter oil circuit are connected in parallel; wherein, when the cooling oil is introduced into the electric drive system through the first filter oil circuit in a positive flow direction, the flushing oil circuit is not conductive; when the cooling oil is introduced into the first filter oil circuit through the flushing oil circuit, the first filter oil circuit and the electric drive system are not conductive, and the cooling oil is introduced into the oil pan through the first filter oil circuit in a reverse flow direction to flush the filter screen. Therefore, by setting up the flushing oil circuit, the cooling oil in the oil pan can be guided to the first filter oil circuit for reverse flow, so as to flush the first filter to solve the blockage problem of the first filter, thereby ensuring the flow of cooling oil entering the electric drive system, so that the electric drive system can dissipate heat normally.

[0016] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, 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 embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the structural framework of an embodiment of an electric drive cooling system provided by the present application;

[0019] Figure 2 yes Figure 1 Schematic diagram of the coordination relationship between the electric drive cooling system and the electric drive system;

[0020] Figure 3 is a structural block diagram of another embodiment of the electric drive cooling system provided by the present application;

[0021] Figure 4 is a structural block diagram of another embodiment of the electric drive cooling system provided by the present application;

[0022] Figure 5is a structural block diagram of another embodiment of the electric drive cooling system provided by the present application;

[0023] Figure 6 It is a structural block diagram of another embodiment of the electric drive cooling system provided in the present application.

[0024] Explanation of the reference numerals: electric drive cooling system 10, first filter oil circuit 11, oil pan 12, first filter element 13, flushing oil circuit 14, drive oil pump 15, first check valve 16, second filter oil circuit 17, second check valve 18, differential pressure sensor 19, second filter element 21, third filter element 22, third check valve 23, electric drive system 30.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] In a first aspect, the present application provides an electric drive cooling system 10, which is applied to new energy vehicles to cool and dissipate heat from the electric drive system through the electric drive cooling system 10, thereby ensuring that the electric drive system operates within a normal temperature range.

[0030] Figure 1 is a schematic diagram of the structural framework of an embodiment of an electric drive cooling system 10 provided in the present application, Figure 2 yes Figure 1 Schematic diagram of the coordination relationship between the electric drive cooling system 10 and the electric drive system 30.

[0031] Combination Figure 1 as well as Figure 2 The electric drive cooling system 10 includes a first filter oil circuit 11 , one end of which is connected to the oil pan 12 , and the first filter oil circuit 11 is used to introduce the cooling oil in the oil pan 12 into the electric drive system 30 to cool the electric drive system 30 .

[0032] Specifically, the other end of the first filter oil circuit 11 is connected to the electric drive system 30, so that the first filter oil circuit 11 introduces the cooling oil into the electric drive system 30 through this end. The oil pan 12 can be the bottom shell of the gearbox. After the cooling oil in the electric drive cooling system 10 cools the electric drive system 30, it will eventually return to the oil pan 12. The first filter oil circuit 11 further introduces the cooling oil in the oil pan 12 into the electric drive system 30 to realize the circulation of the cooling oil in the electric drive cooling system 10.

[0033] More specifically, the electric drive cooling system 10 is also provided with an oil cooler. The cooling oil derived from the first filter oil circuit 11 reaches the oil cooler before entering the electric drive system 30 to cool the cooling oil through the oil cooler. The oil cooler further introduces the cooled cooling oil into the electric drive system 30 to achieve a good cooling effect on the electric drive system 30 through the cooling oil with a lower temperature. Among them, the cooling oil in the embodiment of the present application can not only have a cooling effect, but also have a lubricating effect on the electric drive system 30 to ensure that the electric drive system 30 works smoothly.

[0034] Continue to combine Figure 1 as well as Figure 2 The electric drive cooling system 10 further includes a first filter 13, which is disposed in the first filter oil path 11 and is provided with a filter screen for filtering impurities in the cooling oil. When the cooling oil flows in the first filter oil path 11, it passes through the first filter 13 to filter the impurities in the cooling oil through the filter screen of the first filter 13.

[0035] In some specific application scenarios, the first filter element 13 may be a metal filter suction filter, which filters impurities through a metal filter. At this time, the pore size of the filter of the metal filter may be relatively large to filter larger impurities in the cooling oil, that is, to achieve coarse filtration of the cooling oil.

[0036] Continue to combine Figure 1 as well as Figure 2 The electric drive cooling system 10 also includes a flushing oil circuit 14, a first end of the flushing oil circuit 14 is connected to the oil pan 12, and a second end of the flushing oil circuit 14 is connected to one end of the first filter oil circuit 11, that is, connected to the end of the first filter oil circuit 11 away from the oil pan 12, so that the flushing oil circuit 14 is connected in parallel with the first filter oil circuit 11.

[0037] In combination with the above, when the cooling oil is introduced into the electric drive system 30 along the positive flow direction through the first filter oil circuit 11, the flushing oil circuit 14 is not conductive. The positive flow direction of the first filter oil circuit 11 is the flow direction from the oil pan 12 to the electric drive system 30. In the process of introducing the cooling oil into the electric drive system 30 along the positive flow direction, the flushing oil circuit 14 is not conductive, so that the cooling oil will not flow back into the oil pan 12 through the flushing oil circuit 14, so as to ensure that a sufficient amount of cooling oil can be introduced into the electric drive system 30.

[0038] When the flushing oil circuit 14 is connected and the cooling oil is introduced into the first filter oil circuit 11 through the flushing oil circuit 14, the first filter oil circuit 11 and the electric drive system 30 are not connected, and the cooling oil is introduced into the oil pan 12 through the first filter oil circuit 11 in the reverse direction to flush the filter screen. At this time, the cooling oil led out from the second end of the flushing oil circuit 14 will be completely introduced into the first filter oil circuit 11, and will not be introduced into the electric drive system 30. Since the cooling oil introduced into the first filter oil circuit 11 at this time flows in the reverse direction, that is, flows from the electric drive system 30 to the oil pan 12, the filter screen of the first filter element 13 will be well flushed, thereby reducing or eliminating the blockage of the first filter element 13.

[0039] In summary, by setting the flushing oil circuit 14, the first filter oil circuit 11 can be flushed through the flushing oil circuit 14 based on specific control, thereby reducing or eliminating the blockage of the first filter element 13 to ensure that a sufficient amount of cooling oil enters the electric drive system 30 to cool the electric drive system 30 well.

[0040] Figure 3 It is a structural block diagram of another embodiment of the electric drive cooling system 10 provided in the present application.

[0041] Combination Figure 3In some specific embodiments, a driving oil pump 15 is provided in the first filter oil circuit 11. The driving oil pump 15 is used to drive the cooling oil in the first filter oil circuit 11 to flow. When the driving oil pump 15 rotates in the positive direction, the cooling oil flows in the positive direction. When the driving oil pump 15 rotates in the reverse direction, the cooling oil flows in the reverse direction.

[0042] Specifically, the driving oil pump 15 can be arranged on the side of the first filter element 13 away from the oil pan 12. At this time, the second end of the flushing oil circuit 14 is directly connected to the end of the driving oil pump 15 away from the oil pan 12. Figure 3 Of course, the location of the driving oil pump 15 is not limited thereto.

[0043] It should be understood that the driving oil pump 15 has two working states, namely, a state of rotating in the forward direction and a state of rotating in the reverse direction. In the two working states, the cooling oil is driven to flow in the forward direction and the reverse direction respectively.

[0044] More specifically, the driving oil pump 15 may be an electronic oil pump, such as Figure 3 As shown. However, in other embodiments, the type of the driving oil pump 15 is not limited thereto. For example, the driving oil pump 15 may be a mechanical pump, in which case the driving oil pump 15 is connected to the gear shaft of the electric drive system. It should be understood that when the vehicle is moving forward, the rotation direction of the gear shaft is the positive direction, and at this time the gear shaft drives the driving oil pump to rotate in the positive direction. When the vehicle is moving backward, that is, when the vehicle is in a reversing condition, the gear shaft drives the driving oil pump to rotate in the opposite direction to achieve reverse flushing.

[0045] In combination with the above content, when cooling oil needs to be introduced into the electric drive system 30 through the first filter oil circuit 11, the drive oil pump 15 rotates in the forward direction, and when the first filter oil circuit 11 needs to be flushed through the flushing oil circuit 14, the drive oil pump 15 rotates in the reverse direction.

[0046] Continue to combine Figure 3 In some specific embodiments, a first one-way valve 16 is provided in the flushing oil circuit 14, and the first one-way valve 16 is turned on when the cooling oil is directed from the oil pan 12 to the first filter oil circuit 11. At this time, the conducting direction of the first one-way valve 16 is the direction from the oil pan 12 to the first filter oil circuit 11, and when the cooling oil is directed from the first filter oil circuit 11 to the oil pan 12, the first one-way valve 16 is not turned on.

[0047] It should be understood that, through the setting of the first one-way valve 16, the flushing oil circuit 14 only has the function of introducing the cooling oil into the first filter oil circuit 11 for flushing. When the first filter oil circuit 11 introduces the cooling oil into the drive system, the cooling oil will not flow back into the oil pan 12 through the flushing oil circuit 14.

[0048] Figure 4 It is a structural block diagram of another embodiment of the electric drive cooling system 10 provided in the present application.

[0049] Combination Figure 4 In some specific embodiments, the electric drive cooling system 10 includes a second filter oil circuit 17 and a second one-way valve 18. The second one-way valve 18 is arranged in the second filter oil circuit 17. The second one-way valve 18 is turned on when the cooling oil is guided from the first filter oil circuit 11 to the second filter oil circuit 17.

[0050] It should be understood that the first filter oil circuit 11 and the electric drive system 30 are connected through the second filter oil circuit 17, so that the cooling oil is introduced into the electric drive system 30 through the first filter oil circuit 11 and the second filter oil circuit 17 in sequence. In combination with the above content, the oil cooler can be arranged in the second filter oil circuit 17, or in the oil circuit after the second filter oil circuit 17, and no specific limitation is made here.

[0051] The second one-way valve 18 and the first one-way valve 16 can be one-way valves of the same type, and the conducting direction of the second one-way valve 18 is the direction from the first filter oil circuit 11 to the electric drive system 30. When the cooling oil in the flushing oil circuit 14 is introduced into the first filter oil circuit 11, due to the setting of the second one-way valve 18, the cooling oil in the first filter oil circuit 11 will not be introduced into the second filter oil circuit 17.

[0052] Figure 5 It is a structural block diagram of another embodiment of the electric drive cooling system 10 provided in the present application.

[0053] Combination Figure 5 In some specific embodiments, the electric drive cooling system 10 includes a pressure difference sensor 19, which includes a first detection head and a second detection head. The first detection head is arranged on a side of the first filter element 13 close to the oil pan 12, and the second detection head is arranged on a side of the first filter element 13 away from the oil pan 12. The oil pump 15 is driven to rotate in the opposite direction when the pressure difference sensor 19 detects that the pressure difference between the two sides of the first filter element 13 is greater than the preset pressure difference.

[0054] In combination with the above, in an embodiment where the driving oil pump 15 is a mechanical pump, since the driving oil pump 15 is driven in different modes according to different forward directions of the vehicle, the pressure difference sensor 19 may not be provided.

[0055] Specifically, the first detection head of the differential pressure sensor 19 can be located between the driving oil pump 15 and the first filter element 13. The first detection head of the differential pressure sensor 19 is used to detect the oil pressure of the first filter oil circuit 11 on the side of the first filter element 13 away from the oil pan 12, and the second detection head is used to detect the oil pressure of the first filter oil circuit 11 on the side of the first filter element 13 close to the oil pan 12.

[0056] It should be understood that when the pressure difference between the two sides of the first filter element 13 is greater than the preset pressure difference, it means that the filter screen of the first filter element 13 is clogged, resulting in poor circulation of the cooling oil. At this time, it is necessary to drive the oil pump 15 to operate in the reverse direction so that the cooling oil in the flushing oil circuit 14 is introduced into the first filter oil circuit 11 to flush the filter screen of the first filter element 13.

[0057] Of course, detecting whether the filter screen of the first filter element 13 is clogged is not limited to the above-mentioned setting. In some specific embodiments, the electric drive cooling system 10 further includes a vacuum sensor (not shown), which is disposed between the driving oil pump 15 and the first filter element 13, and the driving oil pump 15 is used to rotate in the opposite direction when the vacuum sensor detects that the vacuum degree is greater than the preset vacuum degree.

[0058] It should be understood that since the driving oil pump 15 is arranged at the rear side of the first filter element 13, after the filter screen of the first filter element 13 is clogged, the operation of the driving oil pump 15 will increase the vacuum degree of the pipe section between the driving oil pump 15 and the first filter element 13. Therefore, when the vacuum degree detected by the vacuum sensor is greater than the preset vacuum degree, it indicates that the filter screen of the first filter element 13 is clogged. At this time, the driving oil pump 15 rotates in the opposite direction to introduce the cooling oil in the flushing oil circuit 14 into the first filter oil circuit 11, thereby flushing the filter screen of the first filter element 13.

[0059] In combination with the arrangement of the differential pressure sensor 19 or the vacuum sensor in the above embodiment, in order to automatically flush the first filter element 13 when the filter screen is clogged, in some specific embodiments:

[0060] The electric drive cooling system 10 includes a controller (not shown), which is connected to the driving oil pump 15 and is also connected to a pressure difference sensor 19 or a vacuum sensor.

[0061] Specifically, the controller is used to control the oil pump 15 to rotate in the opposite direction when the pressure difference sensor 19 detects that the pressure difference between the two sides of the first filter element 13 is greater than the preset pressure difference, or when the vacuum sensor detects that the vacuum degree is greater than the preset vacuum degree.

[0062] Therefore, through the setting of the controller, the first filter frame can be automatically flushed when the flushing conditions are met, without the need for manual operation, which is simple and timely.

[0063] Figure 6 It is a structural block diagram of another embodiment of the electric drive cooling system 10 provided in the present application.

[0064] Combination Figure 6In some specific embodiments, a second filter 21 is provided in the flushing oil circuit 14, and the second filter 21 is used to filter impurities in the cooling oil flowing from the oil pan 12 to the first filter oil circuit 11. The second filter 21 and the first filter 13 can be the same type of filter.

[0065] Among them, a third filter element 22 and a third one-way valve 23 are provided in the second filter oil circuit 17. The third one-way valve 23 is connected in parallel with the third filter element 22. The third filter element 22 is used to filter impurities in the cooling oil in the second filter oil circuit 17. The third one-way valve 23 is used to introduce coolant into the electric drive system 30 when the third filter element 22 is blocked.

[0066] Specifically, the third filter element 22 and the first filter element 13 can be different types of filters, the third filter element 22 is used to filter smaller impurities, and the first filter element 13 is used to filter larger impurities. At this time, the second filter oil circuit 17 is a coarse filter oil circuit.

[0067] The second aspect of the present application provides a vehicle, comprising an electric drive cooling system 10 as in any of the above embodiments, the electric drive cooling system 10 is used to cool the electric drive system 30. For the specific description of the electric cooling system, refer to the contents in the above embodiments, which will not be repeated here.

[0068] In summary, the electric drive cooling system 10 and the vehicle provided by the present application include: a first filter oil circuit 11, one end of which is connected to the oil pan 12, and the first filter oil circuit 11 is used to introduce the cooling oil in the oil pan 12 into the electric drive system 30 to cool the electric drive system 30; a first filter element 13, which is arranged in the first filter oil circuit 11, and the first filter element 13 is provided with a filter screen for filtering impurities in the cooling oil; a flushing oil circuit 14, a first end of which is connected to the oil pan 12, and the flushing oil circuit 14 is connected to the oil pan 12. The second end of the oil filter 4 is connected to one end of the first filter oil circuit 11, so that the flushing oil circuit 14 is connected in parallel with the first filter oil circuit 11; wherein, when the cooling oil is introduced into the electric drive system 30 through the first filter oil circuit 11 in the forward flow direction, the flushing oil circuit 14 is not conductive; when the cooling oil is introduced into the first filter oil circuit 11 through the flushing oil circuit 14, the first filter oil circuit 11 and the electric drive system 30 are not conductive, and the cooling oil is introduced into the oil pan 12 through the first filter oil circuit 11 in the reverse flow direction to flush the filter.

[0069] Therefore, based on any of the above embodiments, by setting the flushing oil circuit 14, the cooling oil in the oil pan 12 can be discharged to the first filter oil circuit 11 to flow in the reverse direction, so as to flush the first filter to solve the blockage problem of the first filter, thereby ensuring the flow of cooling oil entering the electric drive system 30, so that the electric drive system 30 can dissipate heat normally.

[0070] The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the scheme of the present application, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An electric drive cooling system, characterized in that: include: a first filter oil circuit, one end of which is connected to the oil pan, and the first filter oil circuit is used to guide the cooling oil in the oil pan into the electric drive system to cool the electric drive system; a first filter element, disposed in the first filter oil path, wherein the first filter element is provided with a filter screen for filtering impurities in the cooling oil; a flushing oil circuit, a first end of which is in communication with the oil pan, and a second end of which is in communication with one end of the first filtering oil circuit, so that the flushing oil circuit is connected in parallel with the first filtering oil circuit; Among them, when the cooling oil is introduced into the electric drive system through the first filter oil circuit along the positive flow direction, the flushing oil circuit is not conductive; when the cooling oil is introduced into the first filter oil circuit through the flushing oil circuit, the first filter oil circuit and the electric drive system are not conductive, and the cooling oil is introduced into the oil pan through the first filter oil circuit along the reverse flow direction to flush the filter.

2. The electric drive cooling system according to claim 1, characterized in that: A driving oil pump is provided in the first filter oil circuit, and the driving oil pump is used to drive the cooling oil in the first filter oil circuit to flow. When the driving oil pump rotates in the positive direction, it drives the cooling oil to flow along the positive flow direction, and when it rotates in the reverse direction, it drives the cooling oil to flow along the reverse flow direction.

3. The electric drive cooling system according to claim 1, characterized in that: A first one-way valve is disposed in the flushing oil passage, and the first one-way valve is opened when the cooling oil is guided from the oil pan to the first filter oil passage.

4. The electric drive cooling system according to claim 1, characterized in that: The electric drive cooling system includes a second filter oil circuit and a second one-way valve, wherein the second one-way valve is arranged in the second filter oil circuit, and the second one-way valve is turned on when the cooling oil is guided from the first filter oil circuit to the second filter oil circuit.

5. The electric drive cooling system according to claim 2, characterized in that: The electric drive cooling system includes a pressure differential sensor, which includes a first detection head and a second detection head. The first detection head is arranged on a side of the first filter element close to the oil pan, and the second detection head is arranged on a side of the first filter element away from the oil pan. The driving oil pump is used to rotate in the opposite direction when the pressure differential sensor detects that the pressure differential on both sides of the first filter element is greater than a preset pressure differential.

6. The electric drive cooling system according to claim 2, characterized in that: The electric drive cooling system also includes a vacuum sensor, which is disposed between the driving oil pump and the first filter element. The driving oil pump is configured to rotate in the opposite direction when the vacuum sensor detects that the vacuum degree is greater than a preset vacuum degree.

7. The electric drive cooling system according to claim 5, characterized in that: The electric drive cooling system includes a controller, the controller is connected to the drive oil pump, and the controller is also connected to the pressure difference sensor; Wherein, the controller is used to control the driving oil pump to rotate in the reverse direction when the pressure difference sensor detects that the pressure difference on both sides of the first filter element is greater than a preset pressure difference.

8. The electric drive cooling system according to claim 1, characterized in that: A second filter is provided in the flushing oil circuit, and the second filter is used to filter impurities in the cooling oil flowing from the oil pan to the first filter oil circuit.

9. The electric drive cooling system according to claim 4, characterized in that: A third filter element and a third one-way valve are provided in the second filter oil circuit. The third one-way valve is connected in parallel with the third filter element. The third filter element is used to filter impurities in the cooling oil in the second filter oil circuit. The third one-way valve is used to introduce the cooling oil into the electric drive system when the third filter element is blocked.

10. A vehicle, characterized in that: It comprises an electric drive cooling system as described in any one of claims 1 to 9, wherein the electric drive cooling system is used to cool the electric drive system.

Images