A locking mechanism and a battery fixing device

Abstract

The present invention relates to a locking mechanism, which includes a locking housing, a locking connecting piece, a jacking device and a locking ball; the locking connecting piece is sleeved on the end of the locking housing, a locking hole is provided at the end of the locking housing, the locking ball is arranged in the locking housing and can partially extend out through the locking hole, when the locking ball partially extends out of the locking hole, the locking housing and the locking connecting piece are locked relative to each other; the jacking device includes an ejecting block and a jacking rod, the ejecting block is used to eject the locking ball out of the locking hole, the ejecting block has an ejecting groove for cooperating with the locking ball, during the movement of the jacking device between the locking position and the unlocking position, the locking ball is in line contact and cooperation with the ejecting groove. The present invention provides a locking mechanism with small deformation and stable structure. It solves the technical problem in the prior art that the small ball extruded out of the locking hole is prone to deformation, resulting in unsmooth locking or even locking failure.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and particularly to a locking mechanism on an electric vehicle and a battery fixing device using the locking mechanism. Background Art

[0002] The power supply methods for the power batteries of current electric vehicles are generally divided into two types: in-vehicle plug-in charging and battery replacement. Among them, the plug-in charging method has two modes: slow charging and fast charging. When using the plug-in charging method, there are the following defects: 1. The initial investment cost of the battery is relatively large, which hinders the popularization of electric vehicles to a certain extent; 2. The charging time is too long, at least 2 - 4 hours. Compared with refueling ordinary vehicles, the time spent on replenishing energy for electric vehicles is too long, which is very inconvenient and far from meeting people's needs. Moreover, the fast charging mode will cause greater damage to the battery, resulting in a shortened service life of the battery. The method of replacing the battery can effectively avoid the problems existing in the plug-in charging method. In recent years, it has developed, and accordingly, various battery box and battery frame structures have emerged.

[0003] The key to realizing fast battery replacement for electric vehicle power batteries lies in the design of the battery replacement locking mechanism. The main function of the battery replacement lock body is to keep the vehicle body and the battery pack in a firm connection state during non-battery replacement; during battery replacement, it enables the rapid connection and separation of the vehicle body and the battery pack.

[0004] The existing rapid bolt battery replacement device includes a structure with a large ball and a small ball in cooperation. By pushing the large ball upward, the large ball extrudes the small ball out of the locking hole of the lock body housing, so that part of the small ball extruded from the locking hole is used to position and lock the device externally sleeved on the lock body housing. However, such a setting has the following problems:

[0005] The rapid bolt battery replacement device has a structure of a large ball pushing a small ball. The stress concentration occurs at the contact point between the large ball and the small ball. Residual deformation appears in the small ball during the locking process, and many indentations appear on the ball surface, affecting the smoothness of the lock body and possibly resulting in failure of locking and unlocking. The cooperation structure between the lock body on the battery pack side of the rapid bolt battery replacement device and the battery pack is complex, with too many machined surfaces, high requirements for machining accuracy, and high costs.

[0006] In addition, the lock pin bolt of the rapid bolt battery replacement device has no anti-retreat and anti-unlocking structure. When the vehicle is running at high speed, the lock pin bolt may become loose, and at the same time, the lock pin bolt may also be disassembled manually, resulting in the loosening of the bolt, and there is a risk of the battery pack falling off.

[0007] Therefore, it is necessary to provide a locking mechanism without residual deformation, safe and reliable, and with a stable structure to solve the above technical problems. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a locking mechanism that is free of residual deformation, safe and reliable, and has a stable structure. It solves the technical problem in the prior art that the small ball extruded into the locking hole is prone to deformation, resulting in unsmooth locking or even locking failure.

[0009] The technical effects of the present invention are achieved as follows:

[0010] A locking mechanism includes a locking connecting piece, a locking housing, a jacking device, and a locking ball; the locking ball is arranged inside the locking housing, and a locking hole for partially protruding the locking ball is provided on the side surface of the end of the locking housing, and the aperture of the locking hole is smaller than the outer diameter of the locking ball to prevent the locking ball from falling off;

[0011] The jacking device includes an ejecting block and a jacking rod. The ejecting block is used to eject the locking ball out of the locking hole. The ejecting block has an ejecting groove that cooperates with the locking ball, and the jacking rod is used to control the position of the ejecting block; the jacking device can move between a locking position and an unlocking position; when the jacking device is in the locking position, the locking ball at least partially protrudes from the end of the locking housing through the locking hole, and when the jacking device is in the unlocking position, the locking ball is located inside the locking housing.

[0012] The locking connecting piece includes a locking block, and the locking block includes a locking step. The inner diameter of the locking step is greater than or equal to the outer diameter of the end of the locking housing, and when the jacking device is in the locking position, the radius of the inner hole of the locking step is smaller than the maximum distance from the locking ball to the axis of the end of the locking housing; this ensures that the locking ball can lock the locking connecting piece to the locking housing when the jacking rod is in the locking position.

[0013] During the movement of the jacking device between the locking position and the unlocking position, the locking ball and the ejecting groove can be in surface contact fit, or line contact fit, or a combination of both. Preferably, the locking ball and the ejecting groove are in line contact fit. The line contact fit and the surface contact fit are achieved by designing the ejecting groove to include all possible shapes that those skilled in the art can achieve this fit.

[0014] Further, the locking housing further includes a housing connecting portion, the housing connecting portion has an internal thread section of the housing, and the jacking rod has a thread section of the jacking rod. The internal thread section of the housing is in threaded cooperation with the thread section of the jacking rod. This makes the adjustment of the jacking rod more stable and accurate, and can also better maintain the locked state.

[0015] Further, it further includes a limit stop block. The outer surface of the limit stop block is in threaded engagement with the internal threaded section of the housing. The limit stop block is provided with a limit hole. The jacking rod further includes a jacking section. The inner diameter of the limit block is greater than or equal to the outer diameter of the jacking section and less than the outer diameter of the threaded section. The limit stop block can not only limit the rising position of the jacking rod to prevent over-jacking the locking ball, but also adjust different limit heights through threaded engagement, thereby controlling the volume of the locking ball finally protruding from the locking hole.

[0016] Further, it further includes an anti-retreat retaining ring. The anti-retreat retaining ring is provided with a limit stepped hole. The larger-diameter hole of the limit stepped hole is provided with a first toothed structure;

[0017] One end of the jacking rod away from the ejector block is provided with a jacking rod flange surface. The outer diameter of the jacking rod flange surface matches the larger-diameter hole of the limit stepped hole. The outer side of the limit step is provided with a second toothed structure. The first toothed structure matches the second toothed structure. The setting of this anti-retreat and anti-unlocking structure prevents the situation that the jacking rod may become loose.

[0018] Further, it further includes a lock pin nut. The inner surface of the lock pin nut is threadedly connected to the outer surface of the housing connection part. An elastic member is provided between the lock pin nut and the anti-retreat retaining ring. The elastic member is used to provide a biasing force towards the limit step for the anti-retreat retaining ring. The lock pin nut not only serves as a connecting member, but also cooperates with the elastic member to provide a biasing thrust. The elastic member can be a spring, an elastic washer, a foamed rubber, etc.

[0019] Further, the anti-retreat retaining ring is provided with a guide post. The elastic member is a return spring. The return spring is sleeved on the guide post. The lock pin nut is provided with a guide hole. The diameter of the guide hole is greater than the outer diameter of the guide post and less than the outer diameter of the return spring. Through the action of the guide post, the up and down movement of the anti-retreat retaining ring can be better guided, and the offset of the return spring can be prevented.

[0020] Further, a sealing ring is provided on the outer side of the anti-retreat retaining ring to prevent dust or liquid from entering the lock body and causing the lock body to fail.

[0021] There are multiple locking balls, preferably 3 - 6. The number of the ejection grooves is the same as the number of the locking balls. The multiple ejection grooves are evenly distributed on the ejector block.

[0022] Further, the locking connection member further includes a locking connection member body. The locking connection member body is provided with a floating hole. The locking block is arranged in the floating hole. There is a gap between the inner surface of the floating hole and the outer surface of the locking block. By setting a gap between the inner surface of the floating hole and the outer surface of the locking block as a floating gap, a floating effect is generated in the part fitting, and the load-bearing capacity of the lock body is strong.

[0023] Furthermore, an elastic reset member for the ejector block is provided at the upper end of the ejector block, and both ends of the elastic reset member of the ejector block are in contact with the ejector block and the locking housing respectively.

[0024] Furthermore, the ejector block is sequentially provided with a reset member contact portion, a locking ball contact portion, a housing guiding portion, and a jacking rod contact portion from top to bottom. The reset member contact portion is used to abut against one end of the elastic reset member of the ejector block. The locking ball contact portion is provided with the ejection groove, and the horizontal cross-section of the locking ball contact portion gradually increases from top to bottom. The outer surface of the housing guiding portion matches the inner cavity of the locking housing. The jacking rod contact surface is arranged at the jacking rod contact portion, and the jacking rod contact surface is in surface contact with the jacking rod surface.

[0025] In addition, the present application further includes a battery fixing device, which includes a fixing frame and the locking mechanism as described above. The fixing frame is provided with a lock body mounting hole for accommodating the locking mechanism. The locking connecting member is used to connect the battery. A limiting flange is arranged on the outer side of the locking housing, and the outer diameter of the limiting flange is greater than the inner diameter of one end of the lock body mounting hole.

[0026] As described above, the present invention has the following beneficial effects:

[0027] 1) The structure of the large ball pushing the small ball in the quick bolt battery swapping device is changed to the structure of the ejector block with a columnar shape and a running track surface for the small ball pushing the small ball. The force transmission is changed from point contact to line contact, greatly reducing the stress concentration problem at the contact point between the small ball and the large ball.

[0028] 2) The present invention is adapted to the battery side beam. By setting the mounting holes on the fixing frame, the mounting structure is simple and efficient.

[0029] 3) An anti-retreat retaining ring is added to the jacking rod. A toothed anti-retreat structure is added to the anti-retreat retaining ring 18, and a toothed anti-retreat structure is also added to the jacking rod, which can fit with each other, preventing the lock pin bolt from loosening during the high-speed operation of the vehicle and preventing the jacking rod from loosening during manual disassembly.

[0030] 4) A sealing ring is installed on the side of the lock body anti-retreat retaining ring to prevent dust or liquid from entering the lock body and causing the lock body to fail.

[0031] 5) In the device of the present application, the design of the floating lock body on the battery pack side in the prior art is changed to the floating lock body on the vehicle body side. In the locking connecting member connected to the vehicle body, a floating gap is reserved between the locking block and the locking connecting member body in the X direction and the Y direction, so that the locking block moves in the X direction and the Y direction within the locking connecting member body, achieving the purpose of floating the battery swapping lock body. Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the overall structure of the embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the cooperation between the ejection block and the locking ball in the embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the structure of the ejection block in the embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the structure of the anti - detachment component in the embodiment of the present invention;

[0037] Figure 5 For Figure 4 Schematic diagram of the structure of some parts from another angle.

[0038] Among them, the corresponding reference numerals in the drawings are as follows:

[0039] 1. Ejection block elastic reset member; 2. Ejection groove; 3. Locking ball; 4. Ejection block; 5. Locking housing; 6. Locking hole; 7. Locking connecting member; 8. Contact surface of the jacking rod; 9. Outer shell flange; 10. Extruded aluminum side beam of the battery pack; 11. Fixed frame; 12. Locking pin nut; 13. Limit stop block; 14. Dismantling bayonet; 15. Guide post; 16. Return spring; 17. Sealing ring; 18. Anti - retreat washer; 19. Jacking rod; 20. Jacking rod flange surface; 21. Guide hole; 22. Second toothed structure; 23. First toothed structure; 24. Cover plate of the locking connecting member; 25. Locking block; 26. Body of the locking connecting member. Specific embodiments

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] As Figures 1-5As shown in the figure, a locking mechanism includes a locking connecting piece 7, a locking housing 5, a lifting device, and a locking ball 3. The locking ball 3 is arranged inside the locking housing. A locking hole 6 for part of the locking ball to protrude is provided on the side surface of the end of the locking housing 3. The aperture of the locking hole 6 is smaller than the outer diameter of the locking ball to prevent the locking ball from falling off.

[0043] The lifting device includes an ejecting block 4 and a lifting rod 19. The ejecting block 4 is used to eject the locking ball 3 out of the locking hole.

[0044] The ejecting block 4 has an ejecting groove 2 that cooperates with the locking ball 3. An ejecting block return spring 1 is provided at the upper end of the ejecting block 4. Both ends of the ejecting block return spring 1 are in contact with the ejecting block 4 and the locking housing 5 respectively. Both the ejecting groove 2 and the locking ball 3 are 4 in number in this embodiment, and the ejecting grooves 2 are evenly arranged on the ejecting block 4.

[0045] The lifting rod 19 is in contact with the lifting rod contact surface 8 of the ejecting block 4 to control the position of the ejecting block 4. The lifting device can move between a locked position and an unlocked position. When the lifting device is in the locked position, the locking ball 4 at least partially protrudes from the end of the locking housing through the locking hole (as Figure 1 shown). When the lifting device is in the unlocked position, the locking ball 4 is inside the locking housing.

[0046] The locking connecting piece 7 includes a locking block 25. The locking block 25 includes a locking step. The inner diameter of the locking step is greater than or equal to the outer diameter of the end of the locking housing 5. And when the lifting device is in the locked position, the radius of the inner hole of the locking step is less than the maximum distance from the outer surface of the locking ball 3 to the axis of the end of the locking housing. This ensures that the locking ball can lock the locking connecting piece to the locking housing when the lifting rod is in the locked position.

[0047] During the movement of the lifting device between the locked position and the unlocked position, the locking ball 3 and the ejecting groove 2 are in line contact fit. The line contact fit includes all possible shapes that those skilled in the art can achieve this fit. In this embodiment, as Figure 3 shown, it is a preferred shape of the ejecting groove. By calculating the positions of the locking ball 3 at different positions according to the slope of the contact point between the ejecting block 4 and the locking ball 3, the outer shape of the ejecting groove 2 is designed to be in line contact with the locking ball 3. According to the CAE analysis conclusion of this structure, there is no residual deformation at the contact position of the locking ball during locking and unlocking, and theoretically, the sphere will not show plastic deformation.

[0048] The locking housing 5 further includes a housing connecting part. The housing connecting part has an internal thread section of the housing. The lifting rod 19 has a thread section of the lifting rod. The internal thread section of the housing is in threaded fit with the thread section of the lifting rod. This makes the adjustment of the lifting rod 19 more stable and precise, and can also better maintain the locked state.

[0049] It further includes a limit stop block 13. The outer surface of the limit stop block is in threaded cooperation with the internal threaded section of the housing. The limit stop block 13 is provided with a limit hole. The jacking rod 19 further includes a jacking section. The inner diameter of the limit block 13 is greater than or equal to the outer diameter of the jacking section and less than the outer diameter of the threaded section. The limit stop block 13 can not only limit the rising position of the jacking rod 19 to prevent over-jacking of the locking ball 4, but also adjust different limit heights through threaded cooperation, thereby controlling the volume of the locking ball finally protruding from the locking hole 6.

[0050] It further includes an anti-retreat retaining ring 18. The anti-retreat retaining ring 18 is provided with a limit step hole. The larger-diameter hole of the limit step hole is provided with a first toothed structure 23;

[0051] One end of the jacking rod 19 away from the ejector block is provided with a jacking rod flange surface 20. The outer diameter of the jacking rod flange surface 20 matches the larger-diameter hole of the limit step hole. A second toothed structure 22 is provided on the outside of the limit step. The first toothed structure 23 matches the second toothed structure 22. This anti-retreat and anti-unlocking structure is provided to prevent the jacking rod 19 from possibly rotating and loosening.

[0052] It further includes a lock pin nut 12. The lock pin nut 12 is installed in the fixing frame 11 through a disassembly bayonet 14. The inner surface of the lock pin nut 12 is in threaded connection with the outer surface of the housing connection part. An elastic member is provided between the lock pin nut 12 and the anti-retreat retaining ring 13. The elastic member is used to provide a biasing force towards the limit step for the anti-retreat retaining ring. The lock pin nut not only serves as a connecting member but also cooperates with the elastic member to provide a biasing thrust. In this embodiment, the elastic member is a return spring 16. A guide post 15 is provided on the anti-retreat retaining ring 18. The return spring 16 is sleeved on the guide post 15. The lock pin nut 12 is provided with a guide hole 21. The aperture of the guide hole 21 is greater than the outer diameter of the guide post 15 and less than the outer diameter of the return spring 16. Through the action of the guide post 15, the up and down movement of the anti-retreat retaining ring 18 can be better guided, and the offset of the return spring 16 can be prevented.

[0053] A sealing ring 17 is provided on the outside of the anti-retreat retaining ring 18 to prevent dust or liquid from entering the lock body and causing the lock body to fail. Preferably, in this embodiment, the sealing ring is an O-ring.

[0054] The locking connector 7 further includes a locking connector body 26. The locking connector body 26 is provided with a floating hole. The locking block 25 is arranged in the floating hole. There is a gap between the inner surface of the floating hole and the outer surface of the locking block 25. By setting a gap between the inner surface of the floating hole and the outer surface of the locking block 25 as a floating gap, a floating effect is generated for the part cooperation, and the lock body has strong load-bearing capacity.

[0055] Specifically, an ejector block elastic reset member 1 is provided at the upper end of the ejector block 4. The two ends of the ejector block elastic reset member 1 are respectively in contact with the ejector block 4 and the locking housing 5.

[0056] Further, the ejector block 4 is provided with a reset member contact portion, a locking ball contact portion, a housing guiding portion, and a lifting rod contact portion from top to bottom. The reset member contact portion is used to abut one end of the ejector block elastic reset member 1. The locking ball contact portion is provided with an ejection groove 2, and the horizontal cross-section of the locking ball contact portion gradually increases from top to bottom; the outer surface of the housing guiding portion matches the inner cavity of the locking housing, and the lifting rod contact surface 8 is arranged at the lifting rod contact portion, and the lifting rod contact surface 8 is in surface contact with the lifting rod surface.

[0057] With such a configuration of the ejector block 4, the upper and lower surfaces thereof can more stably contact the driving members that displace it, and the design of the locking ball contact portion enables a better design of the ejection groove 2, so that the ejection groove 2 can always be in contact with the locking ball 3 during the locking process. The design of the guiding portion enables the ejector block 4 to be guided when sliding relative to the inner cavity of the locking housing 5 during the entire movement process, and no position deviation will occur.

[0058] In addition, in this embodiment, a fixing frame 11 is further included. The fixing frame is provided with a lock body mounting hole for accommodating the locking mechanism. The fixing frame 11 is specifically an aluminum sleeve on the battery pack side beam 10. The locking connecting piece 7 is used to connect the battery, thereby integrally forming a battery fixing device. Specifically, a limiting flange 9 is provided on the outer side of the locking housing 5. The outer diameter of the limiting flange 9 is larger than the inner diameter of one end of the lock body mounting hole. The locking housing 5 of the locking assembly is screwed with the lock pin nut 12 in the cavity, so that the limiting flange 9 is used as a limiting member to cooperate to realize the stable connection between the locking assembly and the fixing frame 11.

[0059] Embodiment 2:

[0060] The difference from Embodiment 1 is that the lifting device includes an ejector block 4 and a lifting rod 19. The ejector block is used to eject the locking ball out of the locking hole. The lifting rod is integrally formed with the ejector block. The ejector block has an ejection groove that cooperates with the locking ball. The upper end of the ejector block is provided with an ejector block return spring, and both ends of the ejector block return spring are in contact with the ejector block and the locking housing respectively.

[0061] Embodiment 3:

[0062] The difference from Embodiment 1 is that the ejector block 4 has an ejection groove 2 that cooperates with the locking ball 3. The upper end of the ejector block 4 is provided with an ejector block elastic reset member 1, which is specifically an ejector block return spring. Both ends of the ejector block return spring are in contact with the ejector block 4 and the locking housing 5 respectively. Both the ejection groove 2 and the locking ball 3 are 2 or 3 in this embodiment, and the ejection grooves 2 are evenly arranged on the ejector block 4.

[0063] Embodiment 4:

[0064] The difference from Embodiment 1 is that in this embodiment, a lock pin nut 12 is further included. The inner surface of the lock pin nut 12 is threadedly connected to the outer surface of the housing connection part. An elastic member is provided between the lock pin nut 12 and the anti-retreat retaining ring 13. The elastic member is used to provide a biasing force towards the limiting step for the anti-retreat retaining ring. The lock pin nut not only serves as a connecting member but also cooperates with the elastic member to provide a biasing thrust. In this embodiment, the elastic member is an elastic washer or a sealing strip or a foaming material. The elastic material is in direct contact with the anti-retreat washer.

[0065] Through the above specific embodiments, the following technical effects are achieved:

[0066] 1) The structure of the large ball pushing the small ball in the quick bolt battery swapping device is changed to a structure where an ejector block with a columnar shape and a running track surface for the small ball pushes the small ball. The force transmission changes from point contact to line contact, greatly reducing the stress concentration problem at the contact point between the small ball and the large ball.

[0067] 2) The present invention is adapted to the battery pack side beam. By providing mounting holes on the fixing frame, the mounting structure is simple and efficient.

[0068] 3) An anti-retreat retaining ring is added to the jacking rod, and a toothed anti-retreat structure is added to the anti-retreat retaining ring 18. A similar anti-retreat structure is also added to the jacking rod, which can fit with each other, preventing the lock pin bolt from loosening during high-speed vehicle operation and also preventing the jacking rod from loosening during manual disassembly.

[0069] 4) A sealing ring is installed on the side of the lock body anti-retreat retaining ring to prevent dust or liquid from entering the lock body and causing the lock body to fail.

[0070] 5) In the device of the present application, the design of the floating lock body on the battery pack side in the prior art is changed to a floating lock body on the vehicle body side. In the locking connection member connected to the vehicle body, a floating gap is reserved between the locking block and the locking connection member body in the X and Y directions, enabling the locking block to move in the X and Y directions within the locking connection member body to achieve the purpose of floating the battery swapping lock body.

[0071] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein. Various changes and variations can also be made without departing from the scope of the present invention.

[0072] In this article, the front, rear, up, down and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the orientation words should not limit the scope of protection requested by the present application.

[0073] Without conflict, the above embodiments and the features in the embodiments herein can be combined with each other.

[0074] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A locking mechanism, characterized in that, It includes a locking housing (5), a locking connecting piece (7), a jacking device, a locking ball (3) and a fixing bracket (11); The locking housing (5) is of a hollow structure. The locking ball (3) is arranged inside the locking housing (5). A locking hole (6) is provided at the end of the locking housing (5). The locking ball (3) can partially protrude through the locking hole (6). The jacking device is located below the locking ball (3) and at least partially arranged inside the locking housing (5). The jacking device includes a jacking block (4) and a jacking rod (19). The jacking block (4) is used to jack the locking ball (3) out of the locking hole (6). The jacking block (4) has a jacking groove (2) that cooperates with the locking ball (3). The jacking rod (19) is used to control the position of the jacking block (4). The jacking device can move between a locking position and an unlocking position; The locking connecting piece (7) is sleeved on the end of the locking housing (5). When the locking ball (3) partially protrudes out of the locking hole (6), the locking housing (5) and the locking connecting piece (7) are locked relative to each other; The locking connecting piece (7) includes a locking block (25) and a locking connecting piece body (26). The locking block (25) includes a locking step. The inner diameter of the locking step is greater than or equal to the outer diameter of the end of the locking housing (5). And when the jacking device is in the locking position, the radius of the inner hole of the locking step is less than the maximum distance from the locking ball (3) to the axis of the end of the locking housing (5); The locking connecting piece body (26) is provided with a floating hole. The locking block (25) is arranged in the floating hole. There is a gap between the inner surface of the floating hole and the outer surface of the locking block (25); The fixing bracket (11) is provided with a lock body mounting hole for accommodating a locking mechanism. An outer limiting flange (9) is arranged on the outside of the locking housing (5). The outer diameter of the limiting flange (9) is greater than the inner diameter of one end of the lock body mounting hole; During the movement of the jacking device between the locking position and the unlocking position, the locking ball (3) and the jacking groove (2) are in line contact fit.

2. The locking mechanism according to claim 1, characterized in that, The locking housing (5) further includes a housing connecting part. The housing connecting part has an internal thread section of the housing. The jacking rod (19) has a thread section of the jacking rod. The internal thread section of the housing is in threaded cooperation with the thread section of the jacking rod.

3. The locking mechanism according to claim 2, characterized in that, It further includes a limiting stop block (13). The outer surface of the limiting stop block (13) is in threaded cooperation with the internal thread section of the housing. The limiting stop block (13) is provided with a limiting hole. The jacking rod (19) further includes a jacking section. The inner diameter of the limiting stop block (13) is greater than or equal to the outer diameter of the jacking section and less than the outer diameter of the thread section.

4. A locking mechanism according to claim 3, characterized in that, It further includes an anti-retreat retaining ring (18). The anti-retreat retaining ring (18) is provided with a limiting stepped hole. The limiting stepped hole is provided with a first tooth-shaped structure (23); One end of the jacking rod (19) away from the ejector block (4) is provided with a jacking rod flange surface (20), the outer diameter of the jacking rod flange surface (20) matches the limit step hole, and a limit step is provided on the jacking rod flange surface (20); a second tooth-shaped structure (22) is provided outside the limit step, and the first tooth-shaped structure (23) matches the second tooth-shaped structure (22).

5. A locking mechanism according to claim 4, characterized in that, It further includes a lock pin nut (12), the inner surface of the lock pin nut (12) is threadedly connected to the outer surface of the housing connection part, and an elastic member is provided between the lock pin nut (12) and the anti-backlash retaining ring (18), and the elastic member is used to provide a biasing force towards the limit step for the anti-backlash retaining ring (18).

6. A locking mechanism according to claim 5, characterized in that, A guide post (15) is provided on the anti-backlash retaining ring, the elastic member is a return spring (16), the return spring (16) is sleeved on the guide post, the lock pin nut (12) is provided with a guide hole (21), and the aperture of the guide hole (21) is larger than the outer diameter of the guide post (15) and smaller than the outer diameter of the return spring (16).

7. A locking mechanism according to claim 1, characterized in that, An ejector block elastic return member (1) is provided at the upper end of the ejector block (4), and both ends of the ejector block elastic return member (1) are in contact with the ejector block (4) and the locking housing (5) respectively.

8. A locking mechanism according to claim 7, characterized in that, The ejector block (4) is successively provided with a return member contact part, a locking ball contact part, a housing guide part and a jacking rod contact part from top to bottom. The return member contact part is used to abut against one end of the ejector block elastic return member (1). The top groove (2) is provided on the locking ball contact part, and the horizontal cross-section of the locking ball contact part gradually increases from top to bottom; the outer surface of the housing guide part matches the inner cavity of the locking housing (5), and the jacking rod contact surface (8) is provided on the jacking rod contact part, and the jacking rod contact surface (8) is in surface contact with the jacking rod (19).

9. A battery fixing device, characterized in that, It includes a fixed frame (11) and the locking mechanism according to any one of claims 1-8, and a locking connector (7) is used to connect the battery.

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