New energy vehicle chassis structure with variable battery spacing

Abstract

The utility model discloses a new energy vehicle chassis structure with variable battery spacing, which comprises a chassis beam frame, a mounting upper plate and a mounting lower plate, a battery cell comprises an upper battery cell fixed on the lower surface of the upper plate and a lower battery cell fixed on the upper surface of the lower plate, and the upper battery cell and the lower battery cell are distributed in a staggered manner along the horizontal direction. A loosening mechanism which is connected with the lower plate and is used for loosening the lower plate and the chassis beam frame is arranged on the chassis beam frame; the lower plate is connected to the chassis beam frame in a liftable mode through the loosening mechanism, when a battery is rapidly charged or thermal runaway, combustion explosion or other risks occur, the loosening mechanism is driven to control the lower plate to be loosened from the bottom of the chassis beam frame, and the lower plate and a battery cell on the lower plate move downwards under the action of gravity; and the distance between the adjacent battery cells is increased to form a vacancy, so that the possibility of battery combustion is reduced, the heat dissipation performance is improved, and the stability of battery cell installation and the stability of action are ensured at the same time.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and particularly to a new energy vehicle chassis structure with variable battery spacing for increasing the battery spacing. Background Art

[0002] Nowadays, new energy vehicles are developing rapidly, and their total quantity is increasing year by year. Compared with fuel vehicles, new energy vehicles have obvious advantages and are also the future development direction of automobiles. However, their disadvantages are also obvious, mainly that the battery safety problem has not been effectively solved. When fast charging or in thermal runaway, there is not enough heat dissipation space between the closely arranged battery cells. After traffic accidents such as collisions and rear-end collisions, the battery is impacted and collides quickly, triggering a fire. The existing automobile chassis is provided with a battery cavity with a fixed structure, which cannot provide a safe space for the rapidly expanding battery. The expanding battery and the battery cavity form a very dangerous "bomb", laying a hidden danger for the secondary explosion of the automobile. Therefore, the existing automobile chassis structure needs to be optimized to adapt to new energy batteries.

[0003] The applicant applied for a Chinese invention patent in December 2022, with the patent application number 2022117366452 and the patent name "A new energy vehicle chassis structure with variable battery spacing and its explosion-proof method". The new energy vehicle chassis structure includes a chassis beam frame, a lower plate, a battery mounting rack, a pressure cylinder, and a grooved plate. The lower plate is located below the chassis beam frame. All the battery mounting racks are sequentially overlapped in the hollow part inside the chassis beam frame and are located above the lower plate. The battery mounting rack at the topmost layer is fixedly connected to the chassis beam frame. Each adjacent two battery mounting racks are connected by a connecting piece, and the chassis beam frame and the lower plate are connected by a grooved plate. One end of the pressure cylinder is connected to the chassis beam frame and the other end is connected to the lower plate. When there is a risk of battery combustion and explosion, the pressure cylinder breaks the grooved plate, causing the lower plate to separate from the beam frame and continue to move downward. Finally, the connecting pieces between the battery mounting racks are straightened, and the distance between the battery mounting racks is increased, that is, the distance between adjacent two layers of batteries is increased.

[0004] The above patent optimizes the automobile chassis structure, increases the heat dissipation effect of the battery cells by increasing the distance between the batteries, reduces the possibility of battery combustion and explosion, and improves the safety factor of new energy vehicles. However, the battery cells are installed on the battery mounting racks, and the mounting racks maintain their positions through the connecting pieces between the mounting racks. Due to limited chassis space and vehicle lightweighting, etc., the strength of the battery mounting racks and the connecting pieces between the mounting racks cannot be too high, and the battery cells themselves have a large weight, so the fixing strength of the battery cells also needs to be strengthened. Moreover, the increase in the distance between the battery cells relies on the downward movement of the lower plate to drive the connecting pieces and then drive each layer of battery mounting racks to move in sequence, resulting in a complex transmission path, a complex structure, and poor working stability. Therefore, it is necessary to simplify the structure and the transmission path to improve the working stability. Summary of the Invention

[0005] The present utility model provides a chassis structure for a new energy vehicle with variable battery spacing. In this chassis structure for a new energy vehicle with variable battery spacing, battery cells are distributed staggered in the horizontal direction on an upper plate and a lower plate. A loose-off mechanism is used to connect the lower plate to the chassis beam frame in a liftable manner. When the battery is rapidly charged or thermal runaway, combustion explosion or other risks occur, the loose-off mechanism is driven to control the lower plate to become loose from the bottom of the chassis beam frame. Under the action of gravity, the lower plate and the battery cells on the lower plate move downward, and the distance between adjacent battery cells is increased to form a vacancy, reducing the possibility of battery combustion and improving the heat dissipation performance while ensuring the stability of the installation and fixation of the battery cells and the stability of the operation.

[0006] To solve the above technical problems, a chassis structure for a new energy vehicle with variable battery spacing according to the present utility model includes a chassis beam frame, an upper plate installed on the top of the chassis beam frame, and a lower plate arranged at the bottom of the chassis beam frame. A battery cavity for accommodating battery cells is formed among the upper plate, the chassis beam frame and the lower plate. The battery cells include upper battery cells fixed on the lower surface of the upper plate and lower battery cells fixed on the upper surface of the lower plate. The upper battery cells and the lower battery cells are arranged staggered in the horizontal direction. A loose-off mechanism for connecting the lower plate to the chassis beam frame and for loosening the lower plate from the chassis beam frame is provided on the chassis beam frame.

[0007] Furthermore, the loose-off mechanism is provided with no less than 2 pairs and is symmetrically arranged on the chassis beam frame.

[0008] Furthermore, the loose-off mechanism includes a cylinder body, a piston sleeved in the cylinder body, and a piston rod arranged on the piston and extending out of the bottom of the cylinder body. The cylinder body is fixedly installed on the chassis beam frame. One end of the piston rod extending out of the cylinder body is fixedly connected to the edge of the lower plate. A retractable loose-off pin is arranged on the side wall of the cylinder body, and a limiting hole I adapted to the loose-off pin is arranged on the side wall of the piston.

[0009] Furthermore, a loose-off cylinder for driving the movement of the loose-off pin is connected to the upper side wall of the cylinder body. A compressed air tank is arranged on one side of the chassis beam frame. The compressed air tank is communicated with the loose-off cylinder through a loose-off control valve and an air pipe.

[0010] Furthermore, the loose-off cylinder includes a cylinder body I and a sliding sleeve I sleeved in the cylinder body I and separating the cylinder body I into an air inlet chamber I and a reset chamber I. The other end of the loose-off pin far from the piston extends into the air inlet chamber I of the cylinder body I and is fixedly connected to the sliding sleeve I. A reset spring I connecting the sliding sleeve I and the cylinder body I is arranged in the reset chamber I. An air inlet joint I communicated with the air inlet chamber I is arranged on the side wall of the cylinder body I near the air inlet chamber I.

[0011] Further, an air outlet hole I communicating with the limiting hole I is arranged at the center of the end of the loose pin extending into the cylinder body. An air inlet passage I communicating the limiting hole I and the rodless cavity in the cylinder body is arranged in the piston. An air inlet groove I communicating with the air inlet joint is arranged on the inner side wall of the air inlet cavity where the loose pin is located. A central air inlet passage I communicating the air inlet groove I and the air outlet hole I is arranged at the center of the loose pin.

[0012] Further, a reset cylinder for driving the piston to move upward is arranged on the side wall of the lower part of the cylinder body. The reset cylinder includes a cylinder body II and a sliding sleeve II sleeved in the cylinder body II and separating the cylinder body II into an air inlet cavity II and a reset cavity II. A reset pin passing through the air inlet cavity II and extending into the cylinder body is arranged on the sliding sleeve II. A limiting groove adapted to the reset pin is arranged on the side wall of the piston below the limiting hole. A reset spring II connecting the sliding sleeve II and the cylinder body II is arranged in the reset cavity. An air inlet joint II communicating with the air inlet cavity II is arranged on the side wall of the cylinder body II near the air inlet cavity II. An air outlet hole II communicating with the limiting groove is arranged at the center of the end of the reset pin extending into the cylinder body. An air inlet passage II communicating the limiting groove and the rod chamber in the cylinder body is arranged in the piston. An air inlet groove II communicating with the air inlet is arranged on the inner side wall of the air inlet cavity where the reset pin is located. A central air inlet passage II communicating the air inlet groove II and the air outlet hole II is arranged at the center of the reset pin.

[0013] Further, conical surfaces or arc surfaces facilitating the sliding of the loose pin and the reset pin are arranged at the edges of the upper surface and the lower surface of the piston.

[0014] Further, a limiting shaft for supporting on the bottom of the cylinder body when loosening is arranged at the position of the piston rod close to the piston. The diameter of the limiting shaft is larger than that of the piston rod.

[0015] Further, the moving stroke of the loosening mechanism is greater than the height of the upper battery cell or the lower battery cell.

[0016] The beneficial effects of the present utility model are as follows:

[0017] In the new energy vehicle chassis structure with variable battery spacing of the present utility model, the battery cells are distributed in a staggered manner in the horizontal direction on the upper plate and the lower plate. The lower plate is connected to the chassis beam frame in a liftable manner by using the loosening mechanism. When thermal runaway, combustion explosion or other risks occur during rapid charging of the battery, the loosening mechanism is driven to control the lower plate to loosen from the bottom of the chassis beam frame. Under the action of gravity, the lower plate and the battery cells on the lower plate move downward, and the distance between adjacent battery cells is increased to form a vacancy, which reduces the possibility of battery combustion, improves the heat dissipation performance, and at the same time ensures the stability of the battery cell installation and the operation stability. Description of the Drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 Structural schematic diagram of the chassis structure of a new energy vehicle with variable battery spacing according to the present utility model;

[0020] Figure 2 For Figure 1 Enlarged view of part a in

[0021] Figure 3 Top view of the chassis structure of a new energy vehicle with variable battery spacing according to the present utility model;

[0022] Figure 4 For Figure 3 Cross-sectional view taken along A-A in

[0023] Figure 5 For Figure 4 Schematic diagram after the distance between battery cells is increased in

[0024] Figure 6 For Figure 3 Cross-sectional view taken along B-B in

[0025] Figure 7 For Figure 6 All schematic diagrams after the distance between battery cells is increased in

[0026] Figure 8 For Figure 4 Enlarged view of part c in

[0027] Figure 9 For Figure 5 Enlarged view of part e in

[0028] Figure 10 For Figure 8 Schematic diagram of the release cylinder in

[0029] Figure 11 For Figure 8 Partial enlarged view of the connection part between the release cylinder and the piston in

[0030] Description of the drawings: 1 - upper plate; 2 - chassis beam frame; 3 - cross beam; 4 - lower plate; 5 - battery cell; 7 - release mechanism; 7.1 - air inlet joint I; 7.2 - release pin; 7.3 - release spring; 7.4 - air inlet joint II; 7.5 - reset pin; 7.6 - reset spring I; 9 - reset pipeline; 10 - release pipeline; 12 - release control valve; 13 - reset control valve; 15 - compressed air tank; 16 - piston; 17 - piston rod; 18 - release cylinder; 19 - reset cylinder; 20 - cylinder block I; 21 - sliding sleeve I;; 22 - reset cavity I; 23 - air inlet cavity I; 24 - air inlet groove I; 25 - air outlet hole I; 26 - central air inlet channel I; 27 - limit hole I; 28 - air inlet channel; 40 - connecting block. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] As Figure 1-9 The structural schematic diagram of a new energy vehicle chassis structure with variable battery spacing proposed by the present invention. A new energy vehicle chassis structure with variable battery spacing of the present invention includes a chassis beam frame 2 and a cross beam 3 that is part of the chassis beam frame 2, an upper plate 1 installed on the top of the chassis beam frame, and a lower plate 4 arranged at the bottom of the chassis beam frame. A battery cavity for accommodating battery cells 5 is formed between the upper plate 1, the chassis beam frame 2, and the lower plate 4. The battery cells 5 include an upper battery cell fixed on the lower surface of the upper plate 1 and a lower battery cell fixed on the upper surface of the lower plate 4. The upper battery cell and the lower battery cell are arranged in a staggered manner in the horizontal direction. A release mechanism 7 is provided on the chassis beam frame 2 and is connected to the lower plate 4 and is used to release the lower plate 4 from the chassis beam frame 2.

[0033] In this embodiment, by arranging the battery cells 5 in a staggered manner in the horizontal direction on the upper plate 1 and the lower plate 4, and using the release mechanism 7 to connect the lower plate to the chassis beam frame 2 in a liftable manner. When thermal runaway, combustion explosion or other risks occur during rapid charging of the battery, the release mechanism is driven to control the lower plate to be released from the bottom of the chassis beam frame. Under the action of gravity, the lower plate and the battery cells on the lower plate move downward together, and the distance between adjacent upper battery cells and lower battery cells is increased to form a vacancy, which reduces the possibility of battery combustion, improves the heat dissipation performance, and at the same time ensures the stability of the battery cell installation and the stability of the operation.

[0034] In a preferred implementation manner, the release mechanism 7 is provided with not less than 2 pairs and is symmetrically arranged on the chassis beam frame 2. With this structure, through multiple pairs of release mechanisms 7, multiple pairs of release mechanisms 7 can be arranged on the chassis beam frame 2 and at the middle position of the long side, which is convenient to realize the stability of the release mechanism 7 during operation and avoid jamming at critical moments, resulting in the inability of the lower plate and the lower battery cells to move downward together.

[0035] In a preferred embodiment, the release mechanism 7 includes a cylinder block, a piston 16 sleeved in the cylinder block, and a piston rod 17 disposed on the piston 16 and extending out of the bottom of the cylinder block. The cylinder block is fixedly installed on the chassis beam frame 2. One end of the piston rod 17 extending out of the cylinder block is fixedly connected to the edge of the lower plate 4. A retractable release pin 7.2 is provided on the side wall of the cylinder block, and a limiting hole I27 adapted to the release pin 7.2 is provided on the side wall of the piston 16. Before the release in this embodiment, the piston is limited by the release pin 7.2, so that the upper battery cell and the lower battery cell can be staggered horizontally in the battery cavity. The layout structure is compact, and the space position of the battery cavity can be utilized better. During the release, the release pin 7.2 retracts under an external force and slides out of the limiting hole, and at this time, the piston 16, the piston rod 17, the lower plate 4, and the lower battery cell slide downward under gravity to achieve the release function.

[0036] In a preferred embodiment, a release cylinder 18 for driving the release pin 7.2 to move back and forth is connected to the upper side wall of the cylinder block. A compressed air tank 15 is provided on one side of the chassis beam frame 2. The compressed air tank 15 is communicated with the release cylinder 18 through a release control valve 12 and a release air pipe 10. In this embodiment, during the release, the compressed air tank 15 provides air pressure for the release cylinder, and the air pressure is used to drive the release cylinder to act, so that the release pin 7.2 retracts, and the release pin 7.2 slides out of the limiting hole 27 of the piston 16.

[0037] In a preferred embodiment, the release cylinder 18 includes a cylinder block I20 and a sliding sleeve I21 sleeved in the cylinder block I20 and separating the cylinder block I20 into an air inlet chamber I23 and a reset chamber I22. The other end of the release pin 7.2 away from the piston 16 extends into the air inlet chamber I23 of the cylinder block I20 and is fixedly connected to the sliding sleeve I21. A release spring 7.3 connected between the sliding sleeve I21 and the cylinder block I20 is provided in the reset chamber I22. An air inlet joint I7.1 communicated with the air inlet chamber I23 is provided on the side wall of the cylinder block I20 near the air inlet chamber I23. During the implementation of this embodiment, the release cylinder 18 is installed on the side wall of the release mechanism 3 through bolts. Before the air inlet of the release cylinder 18, the release spring I7.3 drives the sliding sleeve I21 and the release pin 7.2 to move to the right and enter the limiting hole I27 on the side wall of the piston 16 to limit the piston 16. After the air inlet of the release cylinder 18, the compressed air tank 15 provides air pressure for the release cylinder 18 to enter the air inlet chamber I23 through the air inlet joint I7.1. The pressure in the air inlet chamber I23 increases, driving the sliding sleeve I21 to compress the release spring I7.3. At this time, the sliding sleeve I21 and the release pin 7.2 move to the left, and the release pin 7.2 slides out of the limiting hole I27 on the side wall of the piston 16, releasing the limit on the piston 16 and facilitating the downward sliding of the piston 16.

[0038] In a preferred embodiment, an air outlet hole I25 communicating with the limiting hole I27 is provided at the center of the end of the release pin 7.2 extending into the cylinder body. An air inlet passage I28 communicating the limiting hole I27 and the rodless chamber in the cylinder body is provided in the piston. An air inlet groove I24 communicating with the air inlet joint I7.1 is provided on the inner side wall of the air inlet chamber 23 where the release pin 7.2 is located. A central air inlet passage I26 communicating the air inlet groove I24 and the air outlet hole I25 is provided at the center of the release pin. In this embodiment, the compressed air tank 15 provides air pressure for the release cylinder 18. When the release pin 7.2 is driven to withdraw from the limiting hole I27, the pressurized air flow passes through the air inlet chamber 23, the air inlet groove I24, the central air inlet passage I26, the air outlet hole I25, the limiting hole I27 and the air inlet passage I28 and enters the rodless chamber in the cylinder body, generating a downward pressure on the piston, so that under the action of gravity and the downward pressure, the lower plate and the battery cell on the lower plate of the release mechanism 7 move downward faster. At the same time, the release mechanism 7 can be blocked, and the release efficiency of the release mechanism 7 is better.

[0039] In a preferred embodiment, a return cylinder 19 for driving the piston 16 to move upward is provided on the side wall of the lower part of the cylinder body. The return cylinder 19 includes a cylinder body II and a sliding sleeve II sleeved in the cylinder body II and dividing the cylinder body II into an air inlet chamber II and a return chamber II. A return pin 7.5 extending through the air inlet chamber II into the cylinder body is provided on the sliding sleeve II. A limiting groove adapted to the return pin is provided on the side wall of the piston below the limiting hole. A return spring II7.6 connecting the sliding sleeve II and the cylinder body II is provided in the return chamber. An air inlet joint II7.4 communicating with the air inlet chamber II is provided on the side wall of the cylinder body II near the air inlet chamber II. An air outlet hole II communicating with the limiting groove is provided at the center of the end of the return pin extending into the cylinder body. An air inlet passage II communicating the limiting groove and the rod chamber in the cylinder body is provided in the piston. An air inlet groove II communicating with the air inlet is provided on the inner side wall of the air inlet chamber where the return pin is located. A central air inlet passage II communicating the air inlet groove II and the air outlet hole II is provided at the center of the return pin. In this embodiment, the structure of the return cylinder 19 is the same as that of the release cylinder 18, and the action is opposite to that of the release cylinder 18. The return cylinder 19 is used to facilitate the continuous use of the release structure and extend the service life of the release structure. When resetting, the return cylinder 19 intakes air, and the compressed air tank 15 is communicated with the return cylinder 19 through the return control valve 13 and the return air pipe 9. When releasing, the release cylinder 18 intakes air.

[0040] In a preferred embodiment, a conical surface or an arc surface facilitating the sliding of the release pin 7.2 and the reset pin 7.5 is provided at the edges of the upper and lower surfaces of the piston. This structure facilitates the downward movement of the piston during release. The conical surface or the arc surface presses the reset pin 7.5, causing the reset pin 7.5 to contract. When the reset pin 7.5 enters the limit groove along the conical surface or the arc surface, the reset pin 7.5 automatically pops out under the action of the spring and enters the limit groove for limiting. During reset, the piston moves upward, and the conical surface or the arc surface presses the release pin 7.2, causing the release pin 7.2 to contract. When the release pin 7.2 enters the limit hole I27 along the conical surface or the arc surface, the release pin 7.2 automatically pops out under the action of the spring and enters the limit hole I27 for limiting.

[0041] In a preferred embodiment, a limit shaft for supporting on the bottom of the cylinder block during release is provided near the piston on the piston rod 17. The diameter of the limit shaft is larger than the diameter of the piston rod. This structure in this embodiment facilitates positioning and prevents the piston from contacting the bottom of the cylinder block.

[0042] In a preferred embodiment, the moving stroke of the release mechanism 7 is greater than the height of the upper battery cell or the lower battery cell. This structure creates a gap when the adjacent upper and lower battery cells are released in place, reducing the possibility of battery combustion, improving the heat dissipation performance, and ensuring the stability of the battery cell installation and the stability of the operation.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A new energy vehicle chassis structure with variable battery spacing, comprising a chassis beam frame, an upper plate installed on the top of the chassis beam frame, and a lower plate arranged at the bottom of the chassis beam frame. A battery cavity for accommodating battery cells is formed among the upper plate, the chassis beam frame and the lower plate, and it is characterized in that: The battery cell includes an upper battery cell fixed on the upper plate and a lower battery cell fixed on the lower plate. The upper battery cell and the lower battery cell are arranged in a staggered manner in the horizontal direction. A release mechanism is provided on the chassis beam frame, which is connected to the lower plate and is used to release the lower plate from the chassis beam frame.

2. The new energy vehicle chassis structure with variable battery spacing according to claim 1, characterized in that: The release mechanism is set to be not less than 2 pairs and is symmetrically arranged on the chassis beam frame.

3. A new energy vehicle chassis structure with variable battery spacing according to claim 1 or 2, characterized in that: The release mechanism includes a cylinder body, a piston sleeved in the cylinder body, and a piston rod arranged on the piston and extending out of the bottom of the cylinder body. The cylinder body is fixedly installed on the chassis beam frame. One end of the piston rod extending out of the cylinder body is fixedly connected to the edge of the lower plate. A retractable release pin is provided on the side wall of the cylinder body, and a limiting hole I adapted to the release pin is provided on the side wall of the piston.

4. A new energy vehicle chassis structure with variable battery spacing according to claim 3, characterized in that: A release air cylinder for driving the release pin to move back and forth is connected to the upper side wall of the cylinder body. A compressed air tank is arranged on one side of the chassis beam frame. The compressed air tank is communicated with the release air cylinder through a release control valve and an air pipe.

5. A new energy vehicle chassis structure with variable battery spacing according to claim 4, characterized in that: The release air cylinder includes a cylinder body I and a sliding sleeve I sleeved in the cylinder body I and separating the cylinder body I into an intake chamber I and a return chamber I. The other end of the release pin away from the piston extends into the intake chamber I of the cylinder body I and is fixedly connected to the sliding sleeve I. A return spring I connecting the sliding sleeve I and the cylinder body I is arranged in the return chamber I. An intake joint I communicating with the intake chamber I is provided on the side wall of the cylinder body I near the intake chamber I.

6. A new energy vehicle chassis structure with variable battery spacing according to claim 5, characterized in that: An air outlet hole I communicating with the limiting hole I is provided at the center of the end of the release pin extending into the cylinder body. An intake passage I communicating the limiting hole I and the rodless chamber in the cylinder body is arranged in the piston. An intake groove I communicating with the intake is provided on the inner side wall of the release pin in the intake chamber. A central intake passage I communicating the intake groove I and the air outlet hole I is arranged at the center of the release pin.

7. The chassis structure of a new energy vehicle with variable battery spacing according to claim 4, characterized in that: A return air cylinder for driving the piston to move upward is provided on the lower side wall of the cylinder body. The return air cylinder includes a cylinder body II and a sliding sleeve II sleeved in the cylinder body II and separating the cylinder body II into an intake chamber II and a return chamber II. A return pin extending through the intake chamber II and into the cylinder body is arranged on the sliding sleeve II. A limiting groove adapted to the return pin is provided on the side wall of the piston below the limiting hole. A return spring II connecting the sliding sleeve II and the cylinder body II is arranged in the return chamber. An intake joint II communicating with the intake chamber II is provided on the side wall of the cylinder body II near the intake chamber II. An air outlet hole II communicating with the limiting groove is provided at the center of the end of the return pin extending into the cylinder body. An intake passage II communicating the limiting groove and the rod chamber in the cylinder body is arranged in the piston. An intake groove II communicating with the intake is provided on the inner side wall of the return pin in the intake chamber. A central intake passage II communicating the intake groove II and the air outlet hole II is arranged at the center of the return pin.

8. A new energy vehicle chassis structure with variable battery spacing according to claim 7, characterized in that: Conical surfaces or arc surfaces facilitating the sliding of the release pin and the return pin are provided at the edges of the upper and lower surfaces of the piston.

9. The chassis structure of a new energy vehicle with variable battery spacing according to claim 7, characterized in that: A limiting shaft for supporting on the bottom of the cylinder body during release is provided at the position of the piston rod close to the piston. The diameter dimension of the limiting shaft is larger than the diameter dimension of the piston rod.

10. A new energy vehicle chassis structure with variable battery spacing according to claim 1, characterized in that: The moving stroke of the release mechanism is greater than the height of the upper battery cell or the lower battery cell.

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