A lock body mechanism for new energy vehicle battery replacement

Abstract

The application relates to the technical field of new energy automobile battery replacement, and specifically discloses a lock body mechanism for new energy automobile battery replacement, which comprises a fixed shell, a nut connected to the inner side of the lower end of the fixed shell through a bearing, and a clamping spring arranged in the inner side of the lower end of the fixed shell. A drop-proof ring is in contact with and supports the upper surface of the clamping spring. A supporting spring is arranged on the outer side of the nut between the upper surface of the drop-proof ring and the lower surface of the upper end of the nut. A pneumatic sealing mechanism is installed on the nut. The upper end of the fixed shell is fixedly connected with a guide pipe coaxial with the fixed shell. The inner side of the guide pipe is provided with guide grooves at equal angles. A fixing bolt penetrates through the guide pipe. The application can prevent dust and sand from entering the thread structure between the fixing bolt and the nut, thereby ensuring that the fixing bolt and the nut can stably and effectively work.

Description

Technical Field

[0001] This invention relates to the field of battery swapping technology for new energy vehicles, specifically a lock mechanism for battery swapping in new energy vehicles. Background Technology

[0002] With the rise and continuous development of new energy vehicles, consumers' demands for rapid charging of these vehicles are gradually increasing. Each OEM is developing different fast-charging solutions in its respective area of ​​expertise. These solutions include increasing battery capacity, accelerating charging speed, and replacing batteries with fully charged ones.

[0003] Replacing the battery pack requires disassembling and securing the battery pack at the bottom of the car. Therefore, various parties have developed relevant bottom fixing structures for the battery pack to facilitate quick fixing and release during the replacement process. Thus, developing a smaller mechanical fixing mechanism that does not require external force is more in line with the current market demand for fast and simple battery replacement fixing.

[0004] However, due to the inconsistency of working environments, the dustproof and mud-proof functions of the fixing mechanism are becoming increasingly important under harsh working conditions. Current mechanical fixing mechanisms have structural flaws in their design. The threads are exposed when they engage and disengage, which cannot prevent dust, mud, and other dirt from the environment from contacting the threads. This leads to problems such as dirt, foreign matter accumulation, and rust on the threads, ultimately resulting in rapid overall failure. Furthermore, under long-term high and low temperature cycles and mud immersion working conditions, they are prone to deformation and failure. Dust, mud, and other impurities can enter the fixing mechanism, causing overall structural failure.

[0005] Therefore, a lock mechanism for battery swapping in new energy vehicles is needed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a lock body mechanism for battery swapping of new energy vehicles, so as to solve the problem mentioned in the background art that the existing lock body mechanism for battery swapping of new energy vehicles cannot prevent dust and dirt such as mud from contacting the threads, which can easily lead to thread structure failure.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A lock mechanism for battery swapping in new energy vehicles includes a fixed outer shell and a nut with a bearing connected to its lower inner side. The inner diameter of the opening on the lower inner side of the fixed outer shell is smaller than the inner diameter of its lower interior. A retaining spring is provided inside the lower end of the fixed outer shell, and an anti-drop ring is supported on the retaining spring. A support spring sleeved on the outside of the nut is provided between the upper surface of the anti-drop ring and the lower surface of the upper end of the nut. A pneumatic sealing mechanism is installed on the nut. A guide tube coaxial with the upper inner side of the fixed outer shell is fixedly connected. A guide groove is provided at equal angles on the inner side of the guide tube. A fixing bolt passes through the guide tube. The lower end of the fixing bolt corresponds to the threaded hole at the upper end of the nut. A guide block is provided at equal angles on the outer side of the upper middle part of the fixing bolt. The end of the guide block is slidably connected to the corresponding guide groove. A magnetic sealing mechanism is provided on the upper surface of the fixed outer shell.

[0009] Preferably, the outer diameter of the retaining spring is larger than the inner diameter of the inner opening at the lower end of the fixed housing, and the outer diameter of the retaining spring is smaller than the inner diameter of the lower end of the fixed housing.

[0010] Preferably, the pneumatic sealing mechanism includes an annular groove provided on the outer side of the upper end of the nut, an elastic air ring sleeved on the annular groove, the height of the elastic air ring being lower than the bearing height connecting the nut and the fixed housing, and a rubber ring provided at the position corresponding to the elastic air ring inside the lower end of the fixed housing.

[0011] Preferably, the pneumatic sealing mechanism further includes an air chamber set at an equal angle on the lower surface of the upper end of the nut, the upper end of a piston extending into the air chamber, the outer side of the upper end of the piston slidingly connected to the inner side of the air chamber, a sealing ring provided on the outer side of the upper end of the piston to fill the gap between the inner side of the air chamber and the outer side of the upper end of the piston, and a return spring provided between the upper end of the piston and the inner top end of the air chamber.

[0012] Preferably, an air supply pipe is provided inside the upper end of the nut. One end of the air supply pipe is connected to the elastic air ring, and the other end of the air supply pipe is connected to the corresponding air chamber. The other end of the air supply pipe is connected to the lower part of the upper end of the piston. The lower end of the piston slides through the lower opening of the air chamber. An elastic pad is provided inside the lower opening of the air chamber. The elastic pad is used to seal the gap between the piston and the lower opening of the air chamber. An installation ring is slidably sleeved on the lower outer side of the nut. The lower end of the piston is fixedly connected to the upper surface of the installation ring. The outer diameter of the installation ring is smaller than the inner diameter of the anti-drop ring.

[0013] Preferably, the magnetic sealing mechanism includes an annular groove on the upper surface of the fixed housing, a main magnetic ring in the annular groove, an annular plate fixedly connected to the lower surface of the main magnetic ring, two annular plates on the lower surface of the main magnetic ring, the inner side of the smaller diameter annular plate being bearing connected to the inner side of the annular groove, a secondary magnetic ring magnetically attracted to the upper surface of the main magnetic ring, the inner side of a flexible sealing gasket fixedly connected to the outer side of the fixing bolt, and the outer side of the flexible sealing gasket fixedly connected to the upper surface of the secondary magnetic ring.

[0014] Preferably, the annular piece with a larger diameter is provided with guide grooves at equal angles, the arc of the guide grooves is 90°, the inner bottom surface of the annular grooves extends through to the upper surface of the fixed shell through a U-shaped groove, the rear end of a U-shaped frame fixed to the lower surface of the main magnetic ring is provided between the two annular pieces, the rear side of the U-shaped frame is fixedly connected to a guide block, and the end of the guide block is slidably connected in the corresponding guide groove, the front end of the U-shaped frame extends through to the upper part of the fixed shell through the U-shaped groove, the front end of the U-shaped frame is fixedly connected to the lower surface of the pressure ring, and a spring sheet is provided between the inside of the U-shaped groove and the U-shaped frame.

[0015] Preferably, the upper surface of the main magnetic ring and the lower surface of the auxiliary magnetic ring are each divided into four equal-angled parts, and the magnetic poles of adjacent parts of the upper surface of the main magnetic ring and the lower surface of the auxiliary magnetic ring are opposite.

[0016] Preferably, elastic rings are provided on both the inner and outer sides of the main magnetic ring, and the elastic rings are used to fill the gap between the main magnetic ring and the ring groove.

[0017] Preferably, the diameter of the flexible sealing gasket is larger than the outer diameter of the secondary magnetic ring, so as to provide a margin for the stretching of the flexible sealing gasket.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the locking mechanism for battery swapping of new energy vehicles can prevent dust and mud from entering the threaded structure between the fixing bolt and the nut, thereby ensuring that the fixing bolt and nut work stably and effectively.

[0019] 1. The flexible sealing gasket and elastic gasket prevent dust and sand from entering between the fixing bolt and nut, thus ensuring the stable and effective operation of the fixing bolt and nut. In addition, before turning the nut, the mounting ring is pushed to drive the piston to move, which reduces the gas content in the elastic gasket, making it easier for the nut to turn. After the piston is reset by the return spring, the gas content in the elastic gasket increases, causing the elastic gasket to bulge, thus ensuring the sealing performance. The above process not only reduces the wear of the elastic gasket and ensures that the elastic gasket can play a sealing role for a long time, but also does not cause obstruction when the nut is turned.

[0020] 2. The upper surfaces of the main magnetic ring and the auxiliary magnetic ring are divided into four parts, with the magnetic poles of adjacent parts being opposite. As the battery pack gradually approaches the chassis, the pressure ring is pressed and approaches the upper surface of the fixed shell. The main magnetic ring can be rotated by the guide block and guide groove. When the main magnetic ring rotates, it can attract the auxiliary magnetic ring to rotate, thereby preventing the flexible sealing gasket from being stretched excessively, which would reduce the life of the flexible sealing gasket and help ensure that the flexible sealing gasket can continue to play a sealing role for a long time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention from a bottom view;

[0023] Figure 3 This is a schematic cross-sectional view of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged structural diagram of point A in the middle;

[0025] Figure 5 For the present invention Figure 3 Enlarged structural diagram of point B;

[0026] Figure 6 This is a schematic diagram of the connection structure of the fixing bolt and nut of the present invention;

[0027] Figure 7 For the present invention Figure 6 Enlarged structural diagram of point C;

[0028] Figure 8 This is a schematic diagram of the connection structure between the fixing bolt and the guide tube of the present invention;

[0029] Figure 9 This is a top view of the main magnetic ring and fixing bolts of the present invention.

[0030] In the diagram: 1. Fixed outer casing; 2. Fixing bolt; 3. Flexible sealing gasket; 4. Pressure bearing ring; 5. Nut; 6. Mounting ring; 7. Snap ring; 8. Anti-drop ring; 9. Guide tube; 10. Ring groove; 11. Annular plate; 12. Main magnetic ring; 13. Secondary magnetic ring; 14. U-shaped groove; 15. U-shaped frame; 16. Spring plate; 17. Guide block; 18. Air chamber; 19. Air supply pipe; 20. Return spring; 21. Piston; 22. Support spring; 23. Guide groove; 24. Guide groove; 25. Guide block; 26. Elastic air ring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-9 The present invention provides the following technical solution:

[0033] Example 1: To address the problem in previous lock mechanisms for battery swapping in new energy vehicles where a gap exists between the fixed housing 1 and the nut 5, allowing dust and mud to easily enter the threaded structure between the nut 5 and the fixing bolt 2, the following technical solution is provided: A lock mechanism for battery swapping in new energy vehicles includes a fixed housing 1 and a nut 5 connected to its lower inner side via a deep groove ball bearing. The inner diameter of the opening on the lower inner side of the fixed housing 1 is smaller than the inner diameter of its lower interior. A retaining spring 7 is provided inside the lower end of the fixed housing 1, and the retaining spring 7 contacts and supports... A support spring 22 is sleeved on the outside of the nut 5 between the upper surface of the anti-drop ring 8 and the lower surface of the upper end of the nut 5. A pneumatic sealing mechanism is installed on the nut 5. A guide tube 9 coaxially connected to the upper inner side of the fixed housing 1 is fixedly connected to it. A guide groove 24 is provided at equal angles on the inner side of the guide tube 9. A fixing bolt 2 passes through the guide tube 9. The lower end of the fixing bolt 2 corresponds to the threaded hole at the upper end of the nut 5. A guide block 25 is provided at equal angles on the outer side of the upper middle part of the fixing bolt 2. The end of the guide block 25 is slidably connected in the corresponding guide groove 24.

[0034] The outer diameter of the snap ring 7 is larger than the inner diameter of the inner opening at the lower end of the fixed housing 1, and the outer diameter of the snap ring 7 is smaller than the inner diameter at the lower end of the fixed housing 1. The pneumatic sealing mechanism includes an annular groove provided on the outer side of the upper end of the nut 5, on which an elastic air ring 26 is fitted. The height of the elastic air ring 26 is lower than the bearing height connecting the nut 5 and the fixed housing 1. A rubber ring is provided at the position corresponding to the elastic air ring 26 inside the lower end of the fixed housing 1. The pneumatic sealing mechanism also includes an air cavity 18 provided at equal angles on the lower surface of the upper end of the nut 5. The upper end of the piston 21 extends into the air cavity 18. The outer side of the upper end of the piston 21 is slidably connected to the inner side of the air cavity 18. A sealing ring is provided on the outer side of the upper end of the piston 21. The sealing ring is used to fill the inner side of the air cavity 18 and the piston 21. The gap between the upper outer sides, a return spring 20 is provided between the upper end of the piston 21 and the inner top of the air chamber 18, an air supply pipe 19 is provided inside the upper end of the nut 5, one end of the air supply pipe 19 is connected to the elastic air ring 26, the other end of the air supply pipe 19 is connected to the corresponding air chamber 18, and the other end of the air supply pipe 19 is connected to the lower part of the upper end of the piston 21. The lower end of the piston 21 slides through the lower end opening of the air chamber 18. An elastic pad is provided inside the lower end opening of the air chamber 18. The elastic pad is used to seal the gap between the piston 21 and the lower end opening of the air chamber 18. An installation ring 6 is slidably sleeved on the lower outer side of the nut 5. The lower end of the piston 21 is fixedly connected to the upper surface of the installation ring 6. The outer diameter of the installation ring 6 is smaller than the inner diameter of the anti-drop ring 8.

[0035] according to Figures 1-3 as well as Figure 5 When in use, the return spring 20 can keep the piston 21 in a relatively constant position in the air chamber 18, and then through the air supply pipe 19, it can ensure that there is a lot of gas in the elastic air ring 26 so that the elastic air ring 26 is in a stable bulging state.

[0036] When the elastic air ring 26 is inflated, it can cooperate with the rubber ring inside the fixed housing 1, so that dust and dirt cannot enter the gap between the nut 5 and the fixing bolt 2 from the inner side of the fixed housing 1 and the inner side of the upper end of the nut 5, thereby ensuring that the thread structure between the nut 5 and the fixing bolt 2 works stably and effectively.

[0037] In addition, when the nut 5 needs to be rotated, the tooling presses against the nut 5 and squeezes the mounting ring 6 upward, driving the piston 21 to move into the air chamber 18. This allows the gas in the elastic air ring 26 to be delivered into the air chamber 18 through the air supply pipe 19 (the tooling contacts the lower surface of the mounting ring 6 before fully pressing against the nut 5, causing the tooling to squeeze the mounting ring 6 during the process of fully pressing against the nut 5, causing it to move upward along the axial direction of the nut 5). This reduces the air pressure in the elastic air ring 26, reduces the squeezing between the elastic air ring 26 and the rubber ring, and avoids the friction between the rubber ring and the elastic air ring 26, which would hinder the rotation of the nut 5.

[0038] In addition, the reduced air pressure inside the elastic air ring 26 can prevent wear and tear, avoid premature failure of the elastic air ring 26, and help ensure its sealing effect for a long time.

[0039] Example 2: To solve the problem that in the previous lock mechanism of the battery swapping of new energy vehicles, there is a gap between the fixed outer shell 1 and the fixed bolt 2, and dust and mud can easily enter the threaded structure between the nut 5 and the fixed bolt 2 through this gap, the following technical solution is provided: Specifically, a magnetic sealing mechanism is provided on the upper surface of the fixed outer shell 1.

[0040] The magnetic sealing mechanism includes an annular groove 10 on the upper surface of the fixed housing 1, a main magnetic ring 12 inside the annular groove 10, and an annular piece 11 fixedly connected to the lower surface of the main magnetic ring 12. Two annular pieces 11 are provided on the lower surface of the main magnetic ring 12. The inner side of the smaller diameter annular piece 11 is connected to the inner side of the annular groove 10 through a deep groove ball bearing. A secondary magnetic ring 13 is magnetically attracted to the upper surface of the main magnetic ring 12. The inner side of a flexible sealing gasket 3 is fixedly connected to the outer side of the fixing bolt 2, and the outer side of the flexible sealing gasket 3 is fixedly connected to the upper surface of the secondary magnetic ring 13. A guide groove 23 is provided at equal angles on the larger diameter annular piece 11. The arc of the guide groove 23 is 90°. The inner bottom surface of the annular groove 10 extends to the upper surface of the fixed housing 1 through a U-shaped groove 14. A U-shaped frame 15 fixed to the lower surface of the main magnetic ring 12 is provided between the two annular pieces 11. A guide groove is fixedly connected to the rear end of the rear end of the U-shaped frame 15. Block 17, and the end of the guide block 17 is slidably connected to the corresponding guide groove 23. The front end of the U-shaped frame 15 passes through the U-shaped groove 14 to the top of the fixed housing 1. The front end of the U-shaped frame 15 is fixedly connected to the lower surface of the pressure ring 4. A spring plate 16 is provided between the inside of the U-shaped groove 14 and the U-shaped frame 15 (the elastic coefficient of the spring plate 16 is 1000N / m, and the spring plate 16 can drive the U-shaped frame 15 to move upward to the maximum value in the U-shaped groove 14). The upper surface of the main magnetic ring 12 and the lower surface of the auxiliary magnetic ring 13 are divided into four parts with equal angles. The magnetic poles of the adjacent parts of the upper surface of the main magnetic ring 12 and the lower surface of the auxiliary magnetic ring 13 are opposite. Elastic rings are provided on both the inner and outer sides of the main magnetic ring 12. The elastic rings are used to fill the gap between the main magnetic ring 12 and the ring groove 10. The diameter of the flexible sealing gasket 3 is larger than the outer diameter of the auxiliary magnetic ring 13, which is used to provide a margin for the stretching of the flexible sealing gasket 3.

[0041] according to Figure 3 , Figure 4 as well as Figures 6-9 When in use, the main magnetic ring 12 and the auxiliary magnetic ring 13 attract each other, which allows the main magnetic ring 12 and the auxiliary magnetic ring 13 to rotate synchronously and to be easily separated from each other.

[0042] As the nut 5 rotates, the fixing bolt 2 is driven to move down and rotate under the action of the guide tube 9, guide groove 24 and guide block 25. During this process, the battery pack gradually approaches the vehicle chassis, thereby gradually squeezing the pressure ring 4.

[0043] When the pressure ring 4 is squeezed, the U-shaped frame 15 will move down synchronously with it, which will enable the main magnetic ring 12 to rotate gradually under the action of the annular plate 11, the guide block 17 and the guide groove 23.

[0044] When the main magnetic ring 12 rotates, the auxiliary magnetic ring 13 connected to it rotates synchronously, which can prevent the flexible sealing gasket 3 from being stretched excessively, thereby preventing the flexible sealing gasket 3 from being worn too quickly, which helps to extend the service life of the flexible sealing gasket 3 and helps to ensure that it can play a sealing role for a long time.

[0045] In the above process, the flexible sealing gasket 3 can prevent dust and dirt from easily entering between the nut 5 and the fixing bolt 2 through this gap, which helps to ensure that the thread structure between the nut 5 and the fixing bolt 2 works stably and effectively.

[0046] During the entire battery swapping process, the pneumatic sealing mechanism first acts on the nut 5. The nut 5 rotates and the fixing bolt 2 moves upward and rotates at the same time, which causes the battery pack to gradually move away from the vehicle chassis. Then, through the spring plate 16 on the magnetic sealing mechanism, the U-shaped frame 15 is reset, and the main magnetic ring 12 is driven to rotate synchronously, so that the auxiliary magnetic ring 13 on the magnetic sealing mechanism rotates synchronously, avoiding the flexible sealing gasket 3 being excessively stretched.

[0047] In use, the new energy vehicle is first driven to the battery swapping station. Then, the fixture holds the nut 5 in place. As the fixture fully holds the nut 5, it comes into contact with and squeezes the mounting ring 6, causing it to move synchronously. When the fixture fully holds the nut 5, the gas content in the elastic gas ring 26 is insufficient to cause it to bulge, thus reducing friction between it and the rubber ring and preventing the frictional force between them from hindering the rotation of the nut 5. Subsequently, the fixture rotates the nut 5. After the nut 5 rotates, the fixing bolt 2 moves upward and rotates simultaneously under the action of the guide tube 9, guide groove 24, and guide block 25, thereby enabling the electric... The battery pack is no longer locked to the chassis. When the fixing bolt 2 moves, the weight of the battery pack will gradually separate the battery pack from the chassis. This allows the U-shaped frame 15 to be reset by the spring plate 16, which in turn allows the main magnetic ring 12 and the auxiliary magnetic ring 13 to rotate synchronously, preventing the flexible sealing gasket 3 from being excessively stretched. Then, the battery pack is removed and replaced with a new one. After that, the tooling holds the nut 5 and rotates the nut 5, so that the fixing bolt 2 moves down and rotates under the action of the guide tube 9, the guide groove 24 and the guide block 25, thereby locking and fixing the battery pack to the chassis.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lock mechanism for battery swapping in new energy vehicles, comprising a fixed outer shell (1) and a nut (5) with a bearing connected to the inner side of its lower end, characterized in that: The inner diameter of the opening at the lower end of the fixed housing (1) is smaller than the inner diameter of its lower end. A retaining ring (7) is provided inside the lower end of the fixed housing (1). An anti-drop ring (8) is supported on the retaining ring (7). A support spring (22) sleeved on the outside of the nut (5) is provided between the upper surface of the anti-drop ring (8) and the lower surface of the upper end of the nut (5). A pneumatic sealing mechanism is installed on the nut (5). A guide tube (9) coaxially connected to the inner side of the upper end of the fixed housing (1) is fixedly connected to it. A guide groove (24) is provided at equal angles on the inner side of the guide tube (9). A fixing bolt (2) is inserted through the upper part of the fixing shell (1). The lower end of the fixing bolt (2) corresponds to the threaded hole at the upper end of the nut (5). A guide block (25) is provided at an equal angle on the outer side of the upper middle part of the fixing bolt (2). The end of the guide block (25) is slidably connected in the corresponding guide groove (24). A magnetic sealing mechanism is provided on the upper surface of the fixing shell (1). The magnetic sealing mechanism includes an annular groove (10) provided on the upper surface of the fixing shell (1). A main magnetic ring (12) is provided in the annular groove (10). An annular piece (11) is fixedly connected to the lower surface of the main magnetic ring (12). (11) Two smaller diameter annular plates (11) are provided on the lower surface of the main magnetic ring (12). The inner bearing of the smaller diameter annular plate (11) is connected to the inner side of the annular groove (10). The upper surface of the main magnetic ring (12) is magnetically attracted to the auxiliary magnetic ring (13). The outer side of the fixing bolt (2) is fixedly connected to the inner side of the flexible sealing gasket (3). The outer side of the flexible sealing gasket (3) is fixedly connected to the upper surface of the auxiliary magnetic ring (13). The larger diameter annular plate (11) is provided with guide grooves (23) at equal angles. The arc of the guide grooves (23) is 90°. The inner bottom surface of the annular groove (10) is penetrated by a U-shaped groove (14). On the upper surface of the fixed outer shell (1), between the two annular pieces (11), a U-shaped frame (15) fixed to the lower surface of the main magnetic ring (12) is provided at the rear end. A guide block (17) is fixedly connected to the rear side of the U-shaped frame (15). The end of the guide block (17) is slidably connected to the corresponding guide groove (23). The front end of the U-shaped frame (15) passes through the U-shaped groove (14) to the top of the fixed outer shell (1). The front end of the U-shaped frame (15) is fixedly connected to the lower surface of the pressure ring (4). A spring piece (16) is provided between the inside of the U-shaped groove (14) and the U-shaped frame (15).

2. The lock mechanism for battery swapping in new energy vehicles according to claim 1, characterized in that: The outer diameter of the snap ring (7) is greater than the inner diameter of the inner opening at the lower end of the fixed housing (1), and the outer diameter of the snap ring (7) is smaller than the inner diameter at the lower end of the fixed housing (1).

3. A lock mechanism for battery swapping in new energy vehicles according to claim 2, characterized in that: The pneumatic sealing mechanism includes an annular groove provided on the outer side of the upper end of the nut (5), and an elastic air ring (26) is sleeved on the annular groove. The height of the elastic air ring (26) is lower than the bearing height connecting the nut (5) and the fixed housing (1). A rubber ring is provided at the position corresponding to the elastic air ring (26) inside the lower end of the fixed housing (1).

4. A lock mechanism for battery swapping in new energy vehicles according to claim 3, characterized in that: The pneumatic sealing mechanism also includes an air chamber (18) set at equal angles on the lower surface of the upper end of the nut (5). The upper end of the piston (21) extends into the air chamber (18). The outer side of the upper end of the piston (21) is slidably connected to the inner side of the air chamber (18). A sealing ring is provided on the outer side of the upper end of the piston (21). The sealing ring is used to fill the gap between the inner side of the air chamber (18) and the outer side of the upper end of the piston (21). A return spring (20) is provided between the upper end of the piston (21) and the inner top end of the air chamber (18).

5. A lock mechanism for battery swapping in new energy vehicles according to claim 4, characterized in that: The upper end of the nut (5) is provided with an air supply pipe (19). One end of the air supply pipe (19) is connected to the elastic air ring (26), and the other end of the air supply pipe (19) is connected to the corresponding air chamber (18). The other end of the air supply pipe (19) is connected to the lower end of the piston (21). The lower end of the piston (21) slides through the lower opening of the air chamber (18). An elastic pad is provided inside the lower opening of the air chamber (18). The elastic pad is used to seal the gap between the piston (21) and the lower opening of the air chamber (18). An installation ring (6) is slidably sleeved on the lower outer side of the nut (5). The lower end of the piston (21) is fixedly connected to the upper surface of the installation ring (6). The outer diameter of the installation ring (6) is smaller than the inner diameter of the anti-drop ring (8).

6. A lock mechanism for battery swapping in new energy vehicles according to claim 1, characterized in that: The upper surface of the main magnetic ring (12) and the lower surface of the auxiliary magnetic ring (13) are each divided into four equal-angled parts, and the magnetic poles of adjacent parts of the upper surface of the main magnetic ring (12) and the lower surface of the auxiliary magnetic ring (13) are opposite.

7. A lock mechanism for battery swapping in new energy vehicles according to claim 6, characterized in that: Both the inner and outer sides of the main magnetic ring (12) are provided with elastic rings, which are used to fill the gap between the main magnetic ring (12) and the ring groove (10).

8. A lock mechanism for battery swapping in new energy vehicles according to claim 6, characterized in that: The diameter of the flexible sealing gasket (3) is larger than the outer diameter of the auxiliary magnetic ring (13) to provide a margin for stretching of the flexible sealing gasket (3).

Images