CN219295166U - Diffuser and electric automobile - Google Patents

Abstract

The embodiment of the application provides a diffuser and electric automobile, belongs to the technical field of automobiles. The diffuser is used for being arranged at the bottom of a vehicle body of the electric vehicle and comprises a top wall, a first side wall and a second side wall, wherein the first side wall and the second side wall are arranged at two sides of the top wall in the left-right direction at intervals; the top wall is provided with a first surface along the thickness direction and deviating from one side of the vehicle body, a channel for the air flow at the bottom of the vehicle body to pass through is formed among the first side wall, the second side wall and the first surface, and the channel is provided with an air inlet end and an air outlet end in the front-back direction; the channel is provided with a contraction area which gradually reduces from front to back between the air inlet end and the air outlet end, and the contraction area is used for arranging an electric driving assembly of the electric automobile so as to cool the electric driving assembly in an air-cooling way. The diffuser can improve the heat dissipation efficiency of an electric drive assembly in an electric automobile.

Description

Diffuser and electric automobile

Technical Field

The application relates to the technical field of automobiles, in particular to a diffuser and an electric automobile.

Background

The electric drive system of the traditional rear-drive electric automobile is usually arranged at the bottom of the automobile, the output power of the electric drive system is increased along with the increase of the speed or load of the automobile, then the heating value of a drive motor and a power module is increased, as the windward side of the rear-drive electric automobile is smaller, the electric drive system only depends on a natural air cooling mode to hardly meet the heat dissipation requirement, if heat dissipation components such as a cooling fan and the like are added on the automobile body, the volume and the cost of the electric drive system are increased, and therefore, how to effectively ensure the heat dissipation capability of the electric drive system is important.

Disclosure of Invention

The embodiment of the application provides a diffuser and an electric automobile, which can improve the heat dissipation efficiency of an electric driving assembly in the electric automobile.

In a first aspect, an embodiment of the present application provides a diffuser, where the diffuser is configured to be mounted at a vehicle bottom of an electric vehicle, and the diffuser includes a top wall, a first side wall and a second side wall, where the first side wall and the second side wall are disposed at two sides of the top wall in a left-right direction at intervals; the top wall is provided with a first surface along the thickness direction and deviating from one side of the vehicle body, a channel for the air flow at the bottom of the vehicle body to pass through is formed among the first side wall, the second side wall and the first surface, and the channel is provided with an air inlet end and an air outlet end in the front-back direction; the channel is provided with a contraction area which gradually reduces from front to back between the air inlet end and the air outlet end, and the contraction area is used for arranging an electric driving assembly of the electric automobile so as to cool the electric driving assembly in an air-cooling way.

In the scheme, the diffuser is arranged at the bottom of the automobile body, a channel for the airflow at the bottom of the automobile body to flow is formed between the first side wall, the second side wall and the top wall in the diffuser, the channel can rectify the airflow at the bottom of the automobile body, a contraction area gradually decreasing from front to back is formed in the channel, according to the aerodynamic and hydrodynamic principles, the ventilation area is reduced, the flow speed of the airflow is increased, therefore, the contraction area in the channel can accelerate the airflow, compared with natural air cooling, the electric driving assembly is arranged at the position, corresponding to the contraction area, of the bottom of the automobile body, the accelerated airflow has stronger heat dissipation capacity on the electric driving assembly, the cooling efficiency on the electric driving assembly is improved, and the heat dissipation efficiency of the electric driving assembly of the automobile is ensured.

In some embodiments, the first side wall and the second side wall each comprise a curved section and a flat section, the two curved sections are arranged opposite to each other from the front end of the flat section to the front edge in the left-right direction, and the curved sections are positioned on the front side of the rear wheel of the electric automobile so as to provide a mud blocking effect for the rear wheel; the two curved sections cooperate with the top wall to form a first constriction region of progressively decreasing front-to-back ventilation area.

According to the technical scheme, the first side wall and the second side wall are respectively provided with the bending sections, the two bending sections are matched with the top wall, namely, the air inlet end of the channel is provided with the horn mouth which is gradually reduced from the front to the rear, so that the ventilation area of the channel from the front to the rear is gradually reduced at the air inlet end, airflow entering the channel is rectified and accelerated, the corresponding electric control part of the electric drive assembly is arranged in the first contraction area, the airflow speed of the channel of the horn mouth is increased like the contraction part of the venturi tube, the corresponding electric control part in the electric drive assembly can be effectively cooled by the airflow which passes through the horn mouth, and dust accumulated on the upper part of the electric drive assembly can be removed. In addition, two bending sections are located the front side of two rear wheels of car respectively, not only make the bending section constitute the fender of car rear wheel, provide the fender mud effect to the rear wheel to the bending section has certain height in vertical direction, and the bending section can provide the shielding effect to the corresponding automatically controlled part of arranging the electric drive assembly in first shrink district, avoids muddy water to splash and dust to influence, has guaranteed the cleanness on electric drive assembly surface, has reduced electric drive system's fault rate.

In some embodiments, the first surface is provided with an air guiding piece between the first contraction zone and the air outlet end, a second contraction zone with gradually reduced front-to-back ventilation area is formed between the air guiding piece and the first side wall, and a third contraction zone with gradually reduced front-to-back ventilation area is formed between the air guiding piece and the second side wall.

According to the technical scheme, the air guide piece is arranged between the first contraction area and the air outlet end through the first surface, the air guide piece can provide blocking and guiding effects on air flow in the channel, so that the ventilation area is reduced, a second contraction area and a third contraction area are formed, the air flow speed in the second contraction area and the air flow speed in the third contraction area are increased, and each electric control part of the electric drive assembly can be respectively arranged in the first contraction area, the second contraction area and the third contraction area according to the position arrangement requirement, so that the arrangement of the corresponding electric control part in the electric drive assembly is more flexible.

In some embodiments, the air guide member includes two air guide plates, the two air guide plates are vertically arranged on the first surface in a herringbone shape, and a second contraction area and a third contraction area are formed between the two air guide plates and the first side wall and the second side wall respectively.

According to the technical scheme, the two air deflectors are vertically arranged on the first surface in the shape of the Chinese character 'lambdoidal', the two air deflectors are respectively matched with the first side wall and the second side wall, so that air flow in the channel is contracted left and right, a second contraction area and a third contraction area, which are distributed left and right, are gradually reduced from front to back, and the position arrangement of electric control components in the electric drive assembly is facilitated.

In some embodiments, in the front-rear direction, the top wall includes a first inclined section near one side of the air inlet end, the distance between the first inclined section and the bottom of the vehicle body gradually increases from the air inlet end to the air outlet end, and a first contraction area is formed between the first inclined section and the two curved sections.

Among the above-mentioned technical scheme, through being the low slope setting in front high back with the first slope section in the roof, can be better carry out rectification to the air current that gets into in the passageway and accelerate, improve the cooling effect to electric drive assembly.

In some embodiments, the top wall further includes a second inclined section near one side of the air outlet end, the second inclined section is engaged with the first inclined section, a distance between the second inclined section and the vehicle bottom part gradually decreases from the air inlet end to the air outlet end, and the second contraction zone and the third contraction zone are located in the second inclined section.

Among the above-mentioned technical scheme, through being low back with the second slope section and setting up in front, form the structure of upwarping promptly at the rear side of diffuser, comb the air current in the passageway, make the air current can pass through the car bottom fast to the second slope section is low back high setting before being, can let the air velocity of flow on vehicle upper portion be less than the velocity of flow of lower part, according to Bernoulli's principle can know, can play the purpose that increases the downforce of car, promotes the stability in the car driving process.

In some embodiments, the front end of the first angled section is equal in height to the rear end of the second angled section, and the front end of the first angled section and the rear end of the second angled section are both connected to the top end of the top wall.

In some embodiments, the top wall further includes a transition section through which the transition between the first angled section and the second angled section is rounded.

Among the above-mentioned technical scheme, the changeover portion makes can smooth and easy transition between first slope section and the second slope section, does benefit to the handing-over department that the air current can be more smooth and easy through first slope section and second slope section, avoids appearing the phenomenon of bottom air current disorder.

In some embodiments, the diffuser further comprises a rear bumper, which is a segmented structure, disposed at the rear end of the top wall, respectively. In this embodiment, the rear bumper is a three-stage structure, and the three-stage rear bumper is disposed at two sides and a middle position of the top wall respectively.

In a second aspect, an embodiment of the present application further provides an electric vehicle, where the electric vehicle includes a vehicle body, an electric driving assembly, and the foregoing diffuser, and the electric driving assembly is at least partially located in the constriction region.

In some embodiments, the electric vehicle further comprises a power battery, wherein the power battery is flatly arranged at the bottom of the vehicle body and positioned at the front side of the channel.

In the technical scheme, the power battery is tiled on the front side of the chassis at the bottom of the vehicle body and forms a whole with the front suspension chassis, so that the generation of vortex of the chassis and the vehicle frame can be effectively reduced, the wind resistance of the whole vehicle is reduced, and the crosswind stability is improved. The power battery is positioned at the front side of the channel, so that after the air flow at the bottom of the vehicle body passes through the power battery, the air flow at the upper side and the lower side of the power battery can enter the channel through the air inlet end.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a diffuser according to some embodiments of the present application;

FIG. 2 is a side view of the diffuser provided in FIG. 1;

FIG. 3 is a bottom oblique view of a diffuser provided in some embodiments of the present application;

FIG. 4 is a bottom view of a diffuser provided in some embodiments of the present application;

FIG. 5 is a side cross-sectional view of a diffuser provided in some embodiments of the present application;

FIG. 6 is a schematic view of another angle configuration of the diffuser provided in FIG. 1;

fig. 7 is a schematic structural diagram of an electric vehicle according to some embodiments of the present disclosure;

fig. 8 is a schematic structural diagram of an electric vehicle according to some embodiments of the present disclosure;

fig. 9 is a schematic structural diagram of an electric vehicle according to other embodiments of the present application.

Icon: a 100-diffuser; 10-top wall; 11-a first inclined section; 12-a second sloped section; 13-transition section; 14-a first surface; 20-a first sidewall; 21-a second sidewall; 22-bending sections; 23-straight sections; 24-avoiding holes; 30-an air guide; 31-air deflectors; 40-channel; 41-an air inlet end; 42-an air outlet end; 43-a first constriction region; 44-a second constriction region; 45-a third constriction region; 50-rear bumpers; 200-an electric automobile; 201-vehicle body; 202-a power cell; 2031-drive motor; 2032-motor controller; 2033-trinity controller; 204-, after; x-left-right direction; y-front-rear direction; z-thickness direction.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put in use of the product of the application, only for convenience of description and simplification of the description, and is not indicative or implying that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Examples

The embodiment of the application provides a diffuser, and electric drive assembly is located the shrink district of diffuser at least partially, and the shrink district can increase the air current velocity of car bottom, can improve the radiating efficiency to electric drive assembly in the electric automobile 200. Specifically, referring to fig. 1 to 6, the diffuser 100 includes a top wall 10, a first side wall 20 and a second side wall 21, and the first side wall 20 and the second side wall 21 are disposed at intervals on both sides of the top wall 10 in the left-right direction X; the top wall 10 has a first surface 14 along its thickness direction Z and facing away from the vehicle body 201, a passage 40 for the air flow at the bottom of the vehicle body 201 to pass through is formed between the first side wall 20, the second side wall 21 and the first surface 14, and in the front-rear direction Y, the passage 40 has an air inlet end 41 and an air outlet end 42; between the air inlet end 41 and the air outlet end 42, the channel 40 has a contraction area with gradually reduced ventilation area from front to back, and the contraction area is used for arranging electric drive components of the electric automobile 200 to cool the electric drive components by air cooling.

In this scheme, install the diffuser 100 in the bottom of automobile body 201, be formed with the passageway 40 that supplies the bottom air current of automobile body 201 to circulate between the first lateral wall 20, second lateral wall 21 and roof 10 in the diffuser 100, passageway 40 can play the effect of rectification to the air current of automobile body 201 bottom, and be formed with the shrink zone that reduces gradually from front to back ventilation area in the passageway 40, according to aerodynamic and hydrodynamic principle, ventilation area reduces, the velocity of flow of air current increases, therefore the shrink zone in passageway 40 can accelerate the air current, compared with natural forced air cooling, arrange electric drive subassembly in the position of automobile body 201 bottom corresponding to the shrink zone, the heat dispersion of the air current that accelerates to electric drive subassembly is stronger, the cooling efficiency to electric drive subassembly has been improved, the cooling efficiency of electric drive subassembly of electric automobile has been guaranteed.

In some embodiments, referring to fig. 3 and 4, each of the first side wall 20 and the second side wall 21 includes a curved section 22 and a flat section 23, the two curved sections 22 are disposed by bending back and forth along the left-right direction X from the front end of the flat section 23, and the curved sections 22 are located on the front side of the rear wheel 204 of the electric automobile 200 to provide a mud-stopping effect on the rear wheel 204; the two curved sections 22 cooperate with the top wall 10 to form a first constriction 43 of progressively decreasing front-to-rear ventilation area.

Through the first side wall 20 and the second side wall 21 each including the curved section 22, the two curved sections 22 cooperate with the top wall 10, that is, a flare opening gradually decreasing from front to back is formed at the air inlet end 41 of the channel 40, so that the ventilation area of the channel 40 gradually decreases from front to back at the air inlet end 41, thereby rectifying and accelerating the airflow entering the channel 40, arranging the corresponding electric control components of the electric drive assembly in the first constriction region 43, the constriction part of the flare opening 40 is similar to the venturi tube to increase the airflow speed, the airflow passing through quickly can effectively cool the corresponding electric control components in the electric drive assembly, and dust accumulated on the upper part of the electric drive assembly can also be removed. In addition, the two bending sections 22 are respectively located at the front sides of the two rear wheels 204 of the automobile, so that the bending sections 22 form a mud guard of the rear wheels 204 of the automobile, the mud guard function is provided for the rear wheels 204, the bending sections 22 have a certain height in the vertical direction, the bending sections 22 can provide shielding function for corresponding electric control components of the electric drive assembly arranged in the first contraction zone 43, mud water splashing and dust influence are avoided, surface cleaning of the electric drive assembly is guaranteed, and failure rate of the electric drive system is reduced.

Wherein, the curved section 22 and the flat section 23 may be integrally formed, and the curved section 22 is configured as a fender at the rear wheel 204 of the electric vehicle, and the fender is heightened in the vertical direction, so as to provide a better shielding effect for the electric control components of the electric driving assembly arranged in the first contraction zone 43, and prevent muddy water from entering the channel 40. And, the bending section 22 is equivalent to forming an air dam, and prevents air flow at two sides of the vehicle body from entering the bottom of the vehicle body 201, so that a certain turbulence effect is achieved, and air resistance can be reduced under a certain condition. The height of the bending section 22 can be selected according to practical conditions, so that the reverse airflow generated during running can be reduced, the downward pressure is generated, and the running stability of the automobile is improved.

In the present embodiment, the curved sections 22 of the first and second side walls 20, 21 constitute a fender of the rear wheel 204, and the diffuser 100 is mounted to the body 201 of the automobile through the first and second side walls 20, 21, that is, to the body 201 through the fender.

In some embodiments, referring to fig. 3 and 4, the first surface 14 is provided with the air guiding member 30 between the first contraction zone 43 and the air outlet end 42, the second contraction zone 44 with gradually decreasing front-to-back ventilation area is formed between the air guiding member 30 and the first side wall 20, and the third contraction zone 45 with gradually decreasing front-to-back ventilation area is formed between the air guiding member 30 and the second side wall 21. By arranging the air guide 30 between the first contraction zone 43 and the air outlet end 42 on the first surface 14, the air guide 30 can provide blocking and guiding effects for the air flow in the channel 40, so that the ventilation area is reduced, a second contraction zone 44 and a third contraction zone 45 are formed, the air flow speed in the second contraction zone 44 and the air flow speed in the third contraction zone 45 are increased, and the electric control components of the electric drive assembly can be respectively arranged in the first contraction zone 43, the second contraction zone 44 and the third contraction zone 45 according to the position arrangement requirement, so that the arrangement of the corresponding electric control components in the electric drive assembly is more flexible.

In some embodiments, referring to fig. 3 and 4, the air guiding member 30 includes two air guiding plates 31, the two air guiding plates 31 are vertically arranged on the first surface 14 in a herringbone manner, and a second contraction area 44 and a third contraction area 45 are formed between the two air guiding plates 31 and the first side wall 20 and the second side wall 21, respectively. The two air deflectors 31 are vertically arranged on the first surface 14 in a herringbone shape, and the herringbone two air deflectors 31 are respectively matched with the first side wall 20 and the second side wall 21, so that air flow in the channel 40 is contracted left and right, a second contraction area 44 and a third contraction area 45 with ventilation areas gradually reduced from front to back are formed, and the position arrangement of electric control components in the electric drive assembly is facilitated.

In some embodiments, referring to fig. 5, in the front-rear direction Y, the top wall 10 includes a first inclined section 11 near the air inlet end 41, the distance between the first inclined section 11 and the bottom of the vehicle body 201 increases gradually from the air inlet end 41 to the air outlet end 42, and a first contraction area 43 is formed between the first inclined section 11 and the two curved sections 22. By arranging the first inclined section 11 in the top wall 10 in a front high and rear low inclined manner, the airflow entering the channel 40 can be better rectified and accelerated, and the cooling effect on the electric drive assembly is improved.

In some embodiments, the top wall 10 further includes a second inclined section 12 near the air outlet end 42, the second inclined section 12 is connected to the first inclined section 11, the distance between the second inclined section 12 and the bottom of the vehicle body 201 gradually decreases from the air inlet end 41 to the air outlet end 42, and the second contraction area 44 and the third contraction area 45 are located in the second inclined section 12. Through being low back with second slope section 12 and setting up in front, form the upwarp structure at the rear side of diffuser promptly, comb the air current in the passageway 40, make the air current can pass through the car bottom fast to second slope section 12 is low back and sets up in front, can let the air velocity of flow in car upper portion be less than the velocity of flow of lower part, can know according to Bernoulli's principle, can play the purpose of increasing the downforce of car, promotes the stability in the car driving process.

The front end of the first inclined section 11 and the rear end of the second inclined section 12 may have the same height or different heights.

Alternatively, the front end of the first inclined section 11 is equal in height to the rear end of the second inclined section 12, and the front end of the first inclined section 11 and the rear end of the second inclined section 12 are both connected to the top end of the top wall 10.

In some embodiments, referring to fig. 5, the top wall 10 further includes a transition section 13, and the first inclined section 11 and the second inclined section 12 smoothly transition through the transition section 13. The transition section 13 enables smooth transition between the first inclined section 11 and the second inclined section 12, which is beneficial to enabling air flow to pass through the junction of the first inclined section 11 and the second inclined section 12 more smoothly, and avoids the phenomenon of bottom air flow disorder.

The first inclined section 11, the transition section 13 and the second inclined section 12 may be integrally formed or may be a split structure. In the present embodiment, the first inclined section 11, the transition section 13 and the second inclined section 12 are integrally formed.

In some embodiments, as shown in fig. 1, the diffuser 100 further includes a rear bumper 50 disposed at the rear end of the top wall 10. In the present embodiment, the rear bumper 50 is a three-stage split structure, and the three-stage rear bumper 50 is disposed at both sides and a middle position of the rear end of the top wall 10, respectively.

In addition, referring to fig. 7, 8 and 9, the electric vehicle 200 includes a vehicle body 201, an electric driving component and a diffuser 100, the electric driving component is at least partially located in a shrinkage area of the diffuser 100, the shrinkage area can increase an airflow speed at the bottom of the vehicle, and heat dissipation efficiency of the electric driving component in the electric vehicle 200 can be improved.

The electric vehicle 200 may be a car, a truck, a bus, or the like, and in this embodiment, the electric vehicle 200 is a small truck.

Referring to fig. 7, 8 and 9, the electric driving assembly of the electric vehicle 200 may include electric control components such as a driving motor 2031, a motor controller 2032 and a three-in-one controller 2033 (including a high-low voltage converter, an on-board charger and a high-voltage distribution box), and a plurality of electric control components in the electric driving assembly may respectively correspond to corresponding contraction areas of the channel 40 according to arrangement positions thereof. Each electric control component in the electric drive assembly is fixedly mounted on the vehicle body 201, the electric control component in the electric drive assembly can be arranged on one side of the diffuser on the vehicle body 201 and then is arranged in the contraction zone in an extending manner through a connecting piece or a connecting arm, of course, the electric control component in the electric drive assembly can also be directly arranged above the diffuser 100 on the vehicle body 201, then an avoidance opening is formed in the top wall 10 of the diffuser, and after passing through the avoidance opening of the top wall 10, the corresponding electric control component of the electric drive assembly at least partially stretches into the contraction zone downwards, so that the corresponding electric control component of the electric drive assembly is cooled through accelerated air flow. In this embodiment, please refer to fig. 7, 8 and 9, the three-in-one controller 2033 is disposed in the first contraction area 43 through the connecting arm, the driving motor 2031 is disposed in the second contraction area 44, the motor controller 2032 is disposed in the third contraction area 45, and the top wall 10 is correspondingly provided with avoiding openings for the driving motor 2031 or the motor controller 2032 to extend out of the second contraction area 44 and the third contraction area 45.

In some embodiments, referring to fig. 7, the electric vehicle 200 further includes a power battery 202, where the power battery 202 is disposed at the bottom of the vehicle body 201 and is located at the front side of the tunnel 40. The power battery 202 is flatly paved on the front side of the chassis at the bottom of the vehicle body 201 and forms a whole with the front suspension chassis, so that the generation of vortex of the chassis and the vehicle frame can be effectively reduced, the wind resistance of the whole vehicle is reduced, and the crosswind stability is improved. The power battery 202 is located at the front side of the channel 40, so that after the airflow at the bottom of the vehicle body 201 passes through the power battery 202, the airflows at the upper and lower sides of the power battery 202 can enter the channel 40 through the air inlet end 41.

The electric vehicle 200 further includes driving axles distributed along the left-right direction X, and the first side wall 20 and the second side wall 21 are correspondingly provided with avoidance holes 24 through which the driving axles pass. The drive axle may be a coaxial drive axle or a balance shaft drive axle, as shown in fig. 8, and fig. 9 is a schematic structural diagram of the coaxial drive axle.

It should be noted that, without conflict, features in the embodiments of the present application may be combined with each other.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The diffuser is used for being mounted at the bottom of a vehicle body of an electric vehicle and is characterized by comprising a top wall, a first side wall and a second side wall, wherein the first side wall and the second side wall are arranged at two sides of the top wall in the left-right direction at intervals; the top wall is provided with a first surface along the thickness direction and deviating from one side of the vehicle body, a channel for the airflow at the bottom of the vehicle body to pass through is formed among the first side wall, the second side wall and the first surface, and the channel is provided with an air inlet end and an air outlet end in the front-back direction;

the air inlet end and the air outlet end are arranged in a channel, the air inlet end and the air outlet end are connected in series, and the air inlet end and the air outlet end are connected in series.

2. The diffuser of claim 1, wherein said first and second side walls each comprise a curved section and a flat section, both of said curved sections being disposed in back-to-back bending from a front end of said flat section forward in said left-to-right direction, said curved sections being located on a front side of a rear wheel of said electric vehicle to provide a mud-stopping effect for said rear wheel; the two curved sections cooperate with the top wall to form a first constriction region of progressively decreasing forward and rearward ventilation area.

3. The diffuser of claim 2 wherein said first surface is provided with an air guide between said first constriction and said air outlet end, said air guide and said first sidewall defining a second constriction between said air guide and said first sidewall having a progressively decreasing front-to-back ventilation area, and a third constriction between said air guide and said second sidewall having a progressively decreasing front-to-back ventilation area.

4. A diffuser according to claim 3 wherein said air guide comprises two air deflectors arranged in a chevron configuration perpendicularly to said first surface, said two air deflectors forming said second and third constriction regions with said first and second sidewalls, respectively.

5. A diffuser according to claim 3, wherein in said front-rear direction, said top wall includes a first inclined section adjacent to said air inlet end side, a distance from said first inclined section to said underbody gradually increasing from said air inlet end to said air outlet end, said first inclined section and two of said curved sections defining said first constriction region therebetween.

6. The diffuser of claim 5 wherein said top wall further comprises a second angled section adjacent to one side of said air outlet end, said second angled section engaging said first angled section, said second angled section being progressively less distant from said underbody from said air inlet end toward said air outlet end, said second constriction region and said third constriction region being located in said second angled section.

7. The diffuser of claim 6 wherein the front end of the first angled section is equal in height to the rear end of the second angled section.

8. The diffuser of claim 6 wherein said top wall further comprises a transition section through which said first angled section and said second angled section smoothly transition.

9. An electric vehicle comprising a vehicle body, an electric drive assembly, and a diffuser according to any one of claims 1-8, wherein the electric drive assembly is at least partially located in the constriction region.

10. The electric vehicle of claim 9, further comprising a power battery disposed horizontally under the underbody and on a front side of the tunnel.

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