Electric vehicle with lightweight structure

Abstract

The application relates to the field of automobile manufacturing, in particular to a lightweight electric automobile which comprises a vehicle body and a battery tray, and a bottom bearing cover plate arranged at the bottom of the vehicle body is covered on the top of the battery tray. The application has the advantages of reducing the automobile structure and the automobile weight.

Description

TECHNICAL FIELD

[0001] The application relates to the field of automobile manufacturing, in particular to a lightweight electric vehicle. BACKGROUND

[0002] The electric vehicle refers to a vehicle that meets the requirements of road traffic and safety regulations and is driven by a vehicle-mounted power source and a motor.

[0003] The electric vehicle in the prior art comprises a vehicle body, a bottom plate arranged at the bottom of the vehicle body, and a battery tray located below the bottom plate, wherein the battery tray is hollow inside and is provided with an opening at the top, a plurality of battery packs are arranged in the battery tray, a battery cover plate is arranged at the opening of the top of the battery tray, and a water cooling plate for cooling the battery packs is arranged below the battery tray.

[0004] The electric vehicle has a large weight, and the larger the weight is, the greater the power loss and production cost are. SUMMARY

[0005] In order to reduce the weight of the electric vehicle, the application provides a lightweight electric vehicle.

[0006] The lightweight electric vehicle provided by the application adopts the following technical scheme:

[0007] The lightweight electric vehicle comprises a vehicle body and a battery tray, and a bottom bearing cover plate is arranged at the top of the battery tray.

[0008] By adopting the above technical scheme, the bottom bearing cover plate is equivalent to the combination of the bottom plate and the battery cover plate in the prior art, so that the structure of the vehicle is reduced and the weight of the vehicle is reduced.

[0009] Optionally, the battery tray comprises a tray plate, side beams arranged at both sides of the tray plate in the length direction, a front cross beam arranged at one side of the tray plate in the width direction, and a rear cross beam arranged at the other side of the tray plate in the width direction, the two side beams, the front cross beam and the rear cross beam are enclosed in a rectangular shape, a plurality of intermediate cross beams parallel to the width direction are arranged on the tray plate in the length direction, cooling water channels are arranged between the front cross beam, the rear cross beam, the two side beams and the plurality of intermediate cross beams, and water inlet pipes and water outlet pipes communicated with the cooling water channels are arranged on the rear cross beam.

[0010] Through adoption of the technical scheme, the cooling liquid flows into the rear cross beam from the water inlet pipe, then flows into one side beam, flows into the other side beam through the front cross beam and the plurality of middle cross beams, then flows back into the rear cross beam, and finally flows out from the water outlet pipe. By opening the cooling water channel in the rear cross beam, the front cross beam, the side beam and the middle cross beam, the cooling capacity of the cooling liquid is transmitted to the battery pack in the battery tray, so that the battery pack is cooled and kept warm. Compared with arranging the water cooling plate below the battery tray to cool the battery pack, opening the cooling water channel in the battery tray is beneficial to reducing the weight of the automobile.

[0011] Optionally, a bottom guard plate is arranged below the tray plate, and a cooling water groove in a snake shape is opened on the upper surface of the bottom guard plate along the direction from the front cross beam to the rear cross beam. A water inlet hole is opened in the bottom of the middle cross beam closest to the front cross beam and communicates with the cooling water groove. A water outlet hole is opened in the bottom of the rear cross beam and is used for connecting the cooling water channel and the cooling water groove.

[0012] Through adoption of the technical scheme, the cooling liquid flows into the cooling water groove from the middle cross beam, and then flows back into the rear cross beam. During the flow of the cooling liquid in the cooling water groove, the bottom of the battery pack can be cooled and kept warm.

[0013] Optionally, a sealing cotton pad is arranged between the bottom support cover plate and the upper surface of the battery tray.

[0014] Through adoption of the technical scheme, the arrangement of the sealing cotton pad is beneficial to enhancing the sealing performance between the bottom support cover plate and the battery tray, and reduces the possibility that water enters the battery tray when the automobile is driven in water, thereby affecting the work of the battery pack.

[0015] Optionally, the cooling water channel in the rear cross beam is arranged to be blocked between the water inlet pipe and the water outlet pipe. A pressurizing pipe is arranged on one side of the middle cross beam relative to the rear cross beam. A control valve is arranged on the other end of the pressurizing pipe corresponding to the flow direction of the cooling liquid in the middle cross beam. A piston column is slidably arranged in the pressurizing pipe and tightly abuts the inner wall of the pressurizing pipe. A motor is embedded on the piston column. The motor and the control valve are electrically connected to a control system. A pressurizing hole is opened between the two end faces of the piston column relative to the axial direction of the piston column. A first accommodation slot is opened on the outer side wall of the pressurizing pipe for the output shaft of the motor to pass through and slide, and the first accommodation slot is parallel to the axis of the pressurizing pipe.

[0016] A blocking sliding pipe is slidably arranged in the middle cross beam and tightly abuts each side wall of the cooling water channel. The output shaft of the motor is rotatably arranged in the blocking sliding pipe and is connected with a blocking piece. A second accommodation slot is opened on the middle cross beam for the output shaft of the motor to pass through and slide, and the second accommodation slot is parallel to the first accommodation slot. A tension spring is arranged between one end of the blocking sliding pipe relative to the control valve and the side beam corresponding to the one end.

[0017] By adopting the technical scheme, the control system opens the control valve and controls the output shaft of the motor to drive the blocking sheet to rotate, the blocking sheet can rotate to block the blocking slide pipe, at this time, the continuous inlet of the cooling liquid can push the blocking slide pipe, the blocking sheet, the motor and the piston column to move, and the tension spring is stretched. The piston column gradually moves away from the control valve, and the air naturally flows into the pressurizing pipe. Then the control system closes the control valve and controls the output shaft of the motor to rotate reversely, so that the blocking slide is kept unblocked again, and the cooling liquid can flow through the blocking slide pipe, at this time, the deformation force of the tension spring drives the blocking slide pipe to quickly reverse and reset. The blocking slide pipe resets by the motor driving the piston column, and because the diameter of the pressurizing hole is small, the air in the pressurizing pipe is quickly extruded during the resetting of the piston column, so that the air circulates in the cavity formed by the two side beams and the two adjacent intermediate cross beams, which is beneficial to uniformly cool the positions on the battery pack.

[0018] Optionally, the blocking sheet is sleeved on the output shaft of the motor, and a longitudinal section of the blocking sheet is in a rhombus shape.

[0019] By adopting the technical scheme, the rhombus shape is beneficial to reduce the obstruction to the flow of the cooling liquid as much as possible, so that the tension spring can more smoothly pull the blocking sheet to reset quickly.

[0020] Optionally, a sealing ring is arranged between the piston column and the pressurizing pipe.

[0021] By adopting the technical scheme, the sealing ring is beneficial to improve the sealing performance between the piston column and the pressurizing pipe, and reduce the possibility that the air is not strong enough to be extruded from the pressurizing pipe when air leakage occurs between the piston column and the pressurizing pipe.

[0022] Optionally, the blocking sheet is made of rubber.

[0023] By adopting the technical scheme, when the blocking sheet rotates to block the blocking slide pipe, the blocking sheet can be deformed to some extent, which is beneficial to improve the blocking effect of the blocking sheet on the blocking slide pipe.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The bottom cover plate is equivalent to the combination of the bottom plate and the battery cover plate in the related art, so that the structure of the automobile is reduced, and the weight of the automobile is also reduced.

[0026] 2. Compared with arranging the water cooling plate under the battery tray to cool the battery pack, the cooling water channel arranged in the battery tray is beneficial to reduce the weight of the automobile.

[0027] 3. The flow of the cooling liquid is used as a power source to pressurize the air inside the battery pack, which is circulated in the battery tray, thereby improving the uniformity of temperature reduction and preservation at various locations on the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is an exploded view of the embodiment 1 of the present application.

[0029] Figure 2 is a sectional view of the positional relationship among the bottom guard plate, the side beam and the supporting plate in the embodiment 1 of the present application.

[0030] Figure 3 is a sectional view of the positional relationship among the plugging slide pipe, the intermediate cross beam and the pressurizing pipe in the embodiment 2 of the present application.

[0031] Figure 4 is Figure 3 is an enlarged view of part A.

[0032] Figure 5 is a sectional view of the positional relationship among the intermediate cross beam, the plugging slide pipe and the plugging sheet in the embodiment 2 of the present application.

[0033] Reference signs: 1, vehicle body; 2, bottom supporting cover plate; 31, supporting plate; 310, water inlet hole; 311, weight-reducing groove; 32, side beam; 33, front cross beam; 34, rear cross beam; 35, intermediate cross beam; 351, displacement slot two; 36, cooling water channel; 37, water inlet pipe; 38, water outlet pipe; 39, stop valve; 4, bottom guard plate; 401, cooling water groove; 5, sealing cotton pad; 6, pressurizing pipe; 601, displacement slot one; 7, control valve; 8, piston column; 801, pressurizing hole; 9, motor; 10, plugging slide pipe; 11, plugging sheet; 12, tension spring; 13, sealing ring. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying Figures 1-5 The present application will be further described in detail.

[0035] The embodiment of the present application discloses a lightweight electric vehicle.

[0036] Embodiment 1

[0037] Referring to Figure 1 The lightweight electric vehicle comprises a vehicle body 1 and a battery tray, the battery tray is hollow inside and has an opening at the top, a plurality of battery packs are placed in the battery tray, and a bottom supporting cover plate 2 provided at the bottom of the vehicle body 1 is attached to the top of the battery tray.

[0038] The bottom supporting cover plate 2 is equivalent to the combination of the bottom plate and the battery cover plate in the related art, and the arrangement of the bottom supporting cover plate 2 reduces the structure and weight of the vehicle.

[0039] Referring toFigure 1 The bottom cover plate 2 is provided with a sealing cotton pad 5 on the upper surface of the battery tray, which is beneficial to improve the sealing performance between the bottom cover plate 2 and the battery tray, and reduce the possibility of water flowing into the battery tray when the car drives in water, thereby affecting the operation of the battery pack.

[0040] Referring to Figure 1 and Figure 2 , the battery tray includes a horizontal support plate 31, two side beams 32 welded on both sides of the length direction of the support plate 31, a front cross beam 33 welded on one side of the width direction of the support plate 31, and a rear cross beam 34 welded on the other side of the width direction of the support plate 31. The two side beams 32, the front cross beam 33 and the rear cross beam 34 are enclosed in a rectangular shape.

[0041] A plurality of intermediate cross beams 35 parallel to the width direction of the support plate 31 are arranged on the support plate 31 along the length direction, and the ends of the intermediate cross beams 35 are welded with the corresponding side beams 32. The plurality of intermediate cross beams 35 divide the inner cavity of the battery tray into a plurality of unit cavities, and each unit cavity is placed with a battery pack.

[0042] Referring to Figure 1 and Figure 2 , a cooling water channel 36 is provided between the front cross beam 33, the rear cross beam 34, the two side beams 32 and the plurality of intermediate cross beams 35. The rear cross beam 34 is provided with a water inlet pipe 37 and a water outlet pipe 38 communicating with the cooling water channel 36, and the water inlet pipe 37 and the water outlet pipe 38 are both provided with a stop valve 39 electrically connected to the control system. The stop valve 39 can realize the functions of cutting off and adjusting the cooling liquid.

[0043] The cooling liquid enters the rear cross beam 34 from the water inlet pipe 37, then enters one side beam 32, and then flows into the other side beam 32 through the plurality of intermediate cross beams 35 and the front cross beam 33, and finally flows back into the rear cross beam 34 and flows out from the water outlet pipe 38.

[0044] During the flow of the cooling liquid in the cooling water channel 36, the cooling capacity is transferred to the unit cavities, thereby realizing the cooling and heat preservation of the battery pack.

[0045] By providing the cooling water channel 36 in the front cross beam 33, the rear cross beam 34, the side beam 32 and the intermediate cross beam 35 to cool the battery pack, the water cooling plate does not need to be additionally arranged below the battery tray to cool the battery pack, thereby reducing the structure and weight of the vehicle body 1.

[0046] Referring to Figure 1 and Figure 2 , the front cross beam 33 and the side beam 32 are in full welding state to prevent the cooling liquid from leaking out and ensure the reliability of the external connection of the battery pack. The intermediate cross beam 35 and the side beam 32, the intermediate cross beam 35 and the support plate 31 are also in full welding state to ensure the stability and safety of the single battery pack.

[0047] Referring to Figure 1 and Figure 2 , the bottom plate 31 is welded with a bottom guard plate 4, the upper surface of the bottom guard plate 4 is provided with a cooling water groove 401 in a snake shape along the direction from the front cross beam 33 to the rear cross beam 34, the bottom of the middle cross beam 35 closest to the front cross beam 33 is provided with a water inlet hole 310 communicated with the cooling water groove 401, and the bottom of the rear cross beam 34 is provided with a water outlet hole (not shown in the figure) for connecting the cooling water channel 36 and the cooling water groove 401.

[0048] The bottom plate 31 is welded by a plurality of unit plates parallel to each other, in order to further reduce the weight of the vehicle body 1, the weight reduction groove 311 is opened between the two ends of the unit plate, the edge beam 32 blocks the openings at both ends of the weight reduction groove 311, and the water inlet hole 310 penetrates the weight reduction groove 311.

[0049] The cooling liquid in the middle cross beam 35 enters the weight reduction groove 311 through the water inlet hole 310, the cooling liquid in the weight reduction groove 311 also flows into the cooling water groove 401 through the water inlet hole 310, and the cooling liquid can realize cooling and heat preservation for the bottom of the battery pack through the bottom plate 31 during the flowing process in the cooling water groove 401. The cooling liquid flows back to the cooling water channel through the water outlet hole, and finally flows out through the water outlet pipe 38.

[0050] The implementation principle of embodiment 1 is that the bottom plate and the battery cover plate in the related art are combined into the bottom cover plate 2, so as to reduce the automobile structure and weight. In addition, the cooling water channel 36 is opened in the battery tray, the cooling water groove 401 is opened on the bottom guard plate 4, the cooling liquid enters the cooling water channel 36 and the cooling water channel 36 from the water supply pipe, so as to realize cooling and heat preservation for the battery pack, and then the cooling liquid flows out from the water outlet pipe 38.

[0051] Embodiment 2

[0052] Referring to Figure 3 Since the battery pack is placed in the above-mentioned unit cavity, there is a gap between the battery pack and the corresponding middle cross beam 35 and edge beam 32, so that a ring-shaped heat dissipation cavity is formed in the unit cavity. From the flow path of the cooling liquid in the battery tray, the cooling effect of the ring-shaped heat dissipation cavity on each part of the battery pack is different.

[0053] Referring to Figure 1 , Figure 3 and Figure 4 , for the above-mentioned case, the difference between this embodiment and embodiment 1 is that the middle cross beam 35 is welded with a pressurizing pipe 6 on one side relative to the rear cross beam 34, and the pressurizing pipe 6 is threadedly connected with a control valve 7 electrically connected to the control system at the other end corresponding to the cooling liquid flowing direction in the middle cross beam 35.

[0054] The pressurizing pipe 6 has a piston column 8 slidingly arranged in the pipe 6 and abutting against the inner wall of the pipe 6. The piston column 8 has a pressurizing hole 801 formed between two end faces of the piston column 8. The piston column 8 has a motor 9 electrically connected to a control system. The pressurizing pipe 6 has a first accommodation slot 601 formed in the outer wall of the pipe 6 and through which an output shaft of the motor 9 extends.

[0055] With reference to Figure 1 , Figure 3 and Figure 4 , the middle cross beam 35 has a blocking slide pipe 10 slidingly arranged in the middle cross beam 35 and abutting against the side walls of the cooling water channel 36. The output shaft of the motor 9 extends into the blocking slide pipe 10 and is connected to a blocking piece 11. The middle cross beam 35 has a second accommodation slot 351 formed in the middle cross beam 35 and through which the output shaft of the motor 9 extends. The second accommodation slot 351 is parallel to the first accommodation slot 601. The blocking slide pipe 10 is provided with a tension spring 12 between one end of the blocking slide pipe 10 and the side beam 32 corresponding to the one end of the blocking slide pipe 10.

[0056] In order to install the piston column 8, the motor 9 and the blocking piece 11 into the blocking slide pipe 10, the pressurizing pipe 6 and the middle cross beam 35, the blocking slide pipe 10, the pressurizing pipe 6 and the middle cross beam 35 are separately provided and connected by welding.

[0057] With reference to Figure 1 , Figure 3 and Figure 4 , in addition, the rear cross beam 34 has the cooling water channel 36 blocked between the water inlet pipe 37 and the water outlet pipe 38. Thus, the cooling liquid flows into the rear cross beam 34 from the water inlet pipe 37 and can only flow into one side beam 32 and then flow into the other side beam 32 through the middle cross beam 35.

[0058] During the flow of the cooling liquid through the middle cross beam 35, the control system opens the control valve 7 and controls the output shaft of the motor 9 to drive the blocking piece 11 to rotate. The blocking piece 11 can rotate to separate the two ends of the blocking slide pipe 10. Thus, the cooling liquid can drive the blocking slide pipe 10, the blocking piece 11, the motor 9 and the piston column 8 to move, and the tension spring 12 is stretched.

[0059] With reference to Figure 1 , Figure 3 and Figure 4 , the piston column 8 gradually moves away from the control valve 7, and the air in the heat dissipation cavity flows into the pressurizing pipe 6. During the movement, the blocking slide pipe 10 always blocks the second accommodation slot 351. Thus, the possibility of the cooling liquid flowing into the unit cavity through the second accommodation slot 351, the first accommodation slot 601 and the pressurizing pipe 6 is reduced.

[0060] With reference to Figure 1 , Figure 3 and Figure 4After sliding for a distance, the control system closes the control valve 7 and reverses the rotation of the output shaft of the motor 9, thereby blocking the reconnection between the two ends of the sliding pipe 10. The coolant in one side beam 32 can flow into the other side beam 32 through the blocked sliding pipe 10. At this time, the deformation force of the tension spring 12 pulls the blocked sliding pipe 10 to quickly reverse and reset.

[0061] The blocked sliding pipe 10 is reset by the motor-driven piston column 8. Because the pressure hole 801 has a small diameter, the air in the pressurizing pipe 6 is quickly squeezed out during the resetting of the piston column 8, thereby driving the circulation of air in the ring-shaped heat dissipation cavity, which is beneficial to the uniform cooling of various positions on the battery pack.

[0062] Referring to Figure 3 , Figure 4 and Figure 5 , the blocking piece 11 is slidably sleeved on the output shaft of the motor 9 and is bonded. The longitudinal section of the blocking piece 11 is in a diamond shape, which can guide the flow of the coolant and reduce the obstruction caused by the blocking piece 11 to the flow of the coolant, so that the tension spring 12 can pull the blocking piece 11 to flow in reverse and reset more easily.

[0063] Referring to Figure 3 , Figure 4 and Figure 5 , the blocking piece 11 is made of rubber. When the motor 9 drives the blocking piece 11 to rotate to block the sliding pipe 10, the blocking piece 11 can deform to some extent, thereby improving the blocking effect on the sliding pipe 10 and ensuring that the coolant can push the sliding pipe 10 to slide.

[0064] Referring to Figure 3 , Figure 4 and Figure 5 , the outer side wall of the piston column 8 extends into the first and second displacement grooves 601 and 351, thereby reducing the possibility of air in the pressurizing pipe 6 being discharged through the first and second displacement grooves 601 and 351, and ensuring the strength of the air being squeezed out of the pressurizing pipe 6 by the piston column 8.

[0065] Referring to Figure 3 , Figure 4 and Figure 5 , a sealing ring 13 is arranged between the piston column 8 and the pressurizing pipe 6. The arrangement of the sealing ring 13 is beneficial to improving the sealing performance between the piston column 8 and the pressurizing pipe 6, and reducing the possibility of insufficient strength of air being squeezed out of the pressurizing pipe 6 due to air leakage between the two.

[0066] The implementation principle of the embodiment 2 is that the control system opens the control valve 7 and controls the output shaft of the motor 9 to drive the sealing plate 11 to rotate, and the sealing plate 11 can rotate to block the sealing slide pipe 10, so that the coolant can drive the sealing slide pipe 10, the sealing plate 11, the motor 9 and the piston column 8 to move, and the tension spring 12 is stretched. The piston column 8 gradually moves away from the control valve 7, and the air in the heat dissipation cavity flows into the pressurizing pipe 6. After sliding a distance, the control system closes the control valve 7 and controls the output shaft of the motor 9 to reverse rotation, so that the sealing slide pipe 10 is kept unblocked again, and the coolant can flow through the sealing slide pipe 10, at this time, the deformation force of the tension spring 12 pulls the sealing slide pipe 10 to quickly reverse slide to realize reset. The sealing slide pipe 10 is reset by the motor driving the piston column 8, and because the aperture of the pressurizing hole 801 is small, the air in the pressurizing pipe 6 is quickly extruded in the process of resetting the piston column 8, so as to drive the circulation flow of the air in the ring-shaped heat dissipation cavity, which is beneficial to realize the uniform cooling of all positions on the battery pack.

[0067] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A lightweight electric vehicle comprising a vehicle body (1) and a battery tray, characterized in that: The top of the battery tray is covered with a bottom supporting cover plate (2) arranged at the bottom of the vehicle body (1); The battery tray comprises a supporting plate (31), side beams (32) arranged at both sides of the supporting plate (31) in the length direction, a front cross beam (33) arranged at one side of the supporting plate (31) in the width direction, and a rear cross beam (34) arranged at the other side of the supporting plate (31) in the width direction, the two side beams (32), the front cross beam (33) and the rear cross beam (34) are enclosed in a rectangular shape, a plurality of intermediate cross beams (35) parallel to the width direction are arranged on the supporting plate (31) in the length direction, cooling water channels (36) are arranged between the front cross beam (33), the rear cross beam (34), the two side beams (32) and the plurality of intermediate cross beams (35), and the rear cross beam (34) is provided with an inlet pipe (37) and an outlet pipe (38) communicating with the cooling water channels (36). The cooling water channels (36) in the rear cross beam (34) are blocked between the inlet pipe (37) and the outlet pipe (38), one side of the intermediate cross beam (35) relative to the rear cross beam (34) is provided with a pressurizing pipe (6), the pressurizing pipe (6) is provided with a control valve (7) corresponding to the other end of the cooling liquid flow direction in the intermediate cross beam (35), the pressurizing pipe (6) is slidably provided with a piston column (8) tightly fitted with the inner wall, the piston column (8) is embedded with a motor (9), the motor (9) and the control valve (7) are electrically connected to the control system, the pressurizing hole (801) is arranged between the two end faces of the piston column (8) relative to the axis direction, the outside wall of the pressurizing pipe (6) is provided with a first accommodation slot (601) for the output shaft of the motor (9) to pass through and slide, and the first accommodation slot (601) is parallel to the axis of the pressurizing pipe (6). The intermediate cross beam (35) is slidably provided with a blocking sliding pipe (10) tightly fitted with each side wall of the cooling water channel (36), the output shaft of the motor (9) is rotatably inserted into the blocking sliding pipe (10) and connected with a blocking piece (11), the intermediate cross beam (35) is provided with a second accommodation slot (351) for the output shaft of the motor (9) to pass through and slide, the second accommodation slot (351) is parallel to the first accommodation slot (601), and the blocking sliding pipe (10) is provided with a tension spring (12) between one end of the blocking sliding pipe (10) relative to the control valve (7) and the side beam (32) corresponding to the end.

2. The lightweight electric vehicle of claim 1, wherein: A bottom protection plate (4) is arranged below the supporting plate (31), a cooling water groove (401) in a snake shape is arranged on the upper surface of the bottom protection plate (4) along the direction from the front cross beam (33) to the rear cross beam (34), a water inlet hole (310) communicating with the cooling water groove (401) is arranged at the bottom of the intermediate cross beam (35) closest to the front cross beam (33), and a water outlet hole for connecting the cooling water channel (36) and the cooling water groove (401) is arranged at the bottom of the rear cross beam (34).

3. The lightweight electric vehicle of claim 1, wherein: A sealing cotton pad (5) is arranged between the bottom supporting cover plate (2) and the upper surface of the battery tray.

4. The lightweight electric vehicle of claim 1, wherein: The blocking sheet (11) is sleeved on the output shaft of the motor (9), and the longitudinal section of the blocking sheet (11) is in a diamond shape.

5. The lightweight electric vehicle of claim 1, wherein: A sealing ring (13) is arranged between the piston column (8) and the pressurizing pipe (6).

6. The lightweight electric vehicle of claim 1, wherein: The blocking sheet (11) is made of rubber.

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