A power battery locking assembly and a new energy vehicle

Abstract

The present invention relates to the technical field of vehicle battery swapping, and in particular, to a power battery locking assembly and a new energy vehicle. The locking assembly includes: In the first locking unit, a first fixed shaft is rotatably connected to a rotating part. A receiving groove and a locking groove are formed in the rotating part. The axis of rotation of the rotating part is parallel to the opening direction of the receiving groove. The opening of the receiving groove is strip-shaped. The first locking unit has a first abutting surface. The first abutting surface extends into the receiving groove and the locking groove. The axis of rotation of the rotating part intersects the first abutting surface. The rotating part has a second abutting surface located in the locking groove. The axis of rotation of the rotating part intersects the extension surface of the second abutting surface and the included angle is an acute angle. The distance between the first abutting surface and the second abutting surface gradually increases or decreases along the circumferential direction of the first fixed shaft. In the second locking unit, a locking tongue protrudes from the circumferential surface of one end of the second fixed shaft. The cross section of the locking tongue is a wedge-shaped surface. Thus, the problem of how to swap the battery in the limited height space of the chassis for battery swapping is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle battery swapping, and in particular, to a power battery locking assembly and a new energy vehicle. Background Art

[0002] At present, new energy vehicles mainly rely on electric energy. The electric energy supply methods of new energy vehicles generally include battery swapping mode and charging mode. The battery swapping mode can achieve the separation of the vehicle and the battery, and can solve the problem of too long charging time. At present, the main battery swapping methods on the market are chassis battery swapping, front cabin / rear end battery swapping, and side panel battery swapping. Among them, chassis battery swapping refers to the method of removing the original battery pack from the lower part of the chassis and replacing it with a new battery pack. Since battery swapping vehicles need to perform battery swapping operations frequently, in the battery swapping process, a locking mechanism is provided between the battery pack and the chassis. The locking mechanism is driven by a battery swapping device to lock and fix or separate the battery pack from the chassis. Chassis battery swapping is easier to implement than the other two methods, takes less time to replace the battery, has a high degree of automation, does not occupy the vehicle use space, and does not affect the overall vehicle shape. It is a currently highly feasible solution.

[0003] However, the battery swapping height space between the vehicle chassis and the flat ground is limited, and the height of conventional locking mechanisms often exceeds the battery swapping height range between the vehicle chassis and the flat ground. The existing chassis battery swapping method is to raise the vehicle by using a portable ramp or a tire jack or by digging a trench at the battery swapping position of the battery swapping station, and then use a battery swapping trolley to perform battery swapping at the bottom of the vehicle body. The above methods increase the construction cost of the battery swapping station and have limitations on the battery swapping site, making it difficult to meet the needs of vehicle owners for anytime, anywhere, fast and efficient battery swapping. Summary of the Invention

[0004] To solve the problem of how to perform battery swapping in the limited chassis battery swapping height space, the present invention provides a power battery locking assembly and a new energy vehicle.

[0005] In a first aspect, the present invention provides a power battery locking assembly, and the power battery locking assembly includes:

[0006] The first locking unit, the first locking unit includes a first fixed shaft and a rotating part; the first fixed shaft is rotatably connected to the rotating part; the first fixed shaft is used for detachably connecting to the chassis of the vehicle; an accommodating groove and a locking groove with intersecting opening directions are formed on the rotating part; the axis of rotation of the rotating part is parallel to the opening direction of the accommodating groove; the accommodating groove is located at the center of rotation of the rotating part; the opening of the accommodating groove is strip-shaped; the locking groove communicates with the accommodating groove; the first locking unit has a first abutting surface; the first abutting surface extends into the accommodating groove and the locking groove; the axis of rotation of the rotating part intersects the first abutting surface; the rotating part has a second abutting surface; the second abutting surface is located in the locking groove; the axis of rotation of the rotating part intersects the extension surface of the second abutting surface and the included angle is acute; the distance between the first abutting surface and the second abutting surface gradually increases or decreases along the circumferential direction around the first fixed shaft.

[0007] The second locking unit, the second locking unit includes a second fixed shaft and a locking tongue; the locking tongue is fixedly connected to one end of the second fixed shaft; the locking tongue protrudes from the circumferential surface of the second fixed shaft; the locking tongue has a first locking surface and a second locking surface facing away from each other; the included angle between the second locking surface and the axis of the second fixed shaft is acute; the distance between the first locking surface and the second locking surface gradually increases or decreases along the circumferential direction around the second fixed shaft.

[0008] Wherein, the power battery locking assembly has a locking state and an unlocking state.

[0009] In the locking state, the second fixed shaft passes through the accommodating groove, the locking tongue is located in the locking groove, the first locking surface is in contact with the first abutting surface, and the second locking surface is in contact with the second abutting surface.

[0010] In the unlocking state, the first locking unit is separated from the second locking unit.

[0011] In some embodiments, the first locking unit further includes a driving part; the driving part includes a gear; the gear is integrally formed or fixedly connected with the rotating part; the outer diameter of the gear is equal to the outer diameter of the rotating part.

[0012] In some embodiments, the gear is an incomplete gear; the locking groove and the projection of the gear on the end surface of one end of the rotating part along its own axis are arranged in a staggered manner.

[0013] In some embodiments, there are two locking tongues arranged oppositely; the gear includes two incomplete gears; in the locking state, the two locking tongues and the projections of the two incomplete gears on the end surface of one end of the rotating part along its own axis are arranged in an interleaved manner.

[0014] In some embodiments, the locking tongues correspond to the second abutting surfaces one by one; the angle between the second abutting surface and the axis of the first fixed shaft is a first inclination angle; the angle between the second locking surface of the locking tongue and the axis of the second fixed shaft is a second inclination angle; the first inclination angle of the second abutting surface is equal to the second inclination angle of the corresponding locking tongue;

[0015] The first inclination angles corresponding to the two second abutting surfaces have a difference.

[0016] In some embodiments, the distance between the second abutting surface and the teeth of the incomplete gear is a first distance; the first distance is negatively correlated with the first inclination angle.

[0017] In some embodiments, the opening width of the accommodating groove is greater than the diameter of the second fixed shaft.

[0018] In a second aspect, the present invention provides a new energy vehicle, which includes the power battery locking assembly according to any one of the above embodiments; the new energy vehicle further includes:

[0019] A vehicle body;

[0020] A chassis, which is detachably connected to the vehicle body; the first fixed shaft of the power battery locking assembly is detachably connected to the chassis;

[0021] Wheels, which are rotatably connected to the chassis;

[0022] A power battery box; the second fixed shaft of the power battery locking assembly is detachably connected to the power battery box.

[0023] In some embodiments, there are two locking tongues arranged oppositely; the arrangement direction of the two locking tongues is perpendicular to the driving direction of the vehicle.

[0024] In some embodiments, the locking tongues correspond to the second abutting surfaces one by one; the angle between the second abutting surface and the axis of the first fixed shaft is a first inclination angle; the angle between the second locking surface of the locking tongue and the axis of the second fixed shaft is a second inclination angle; the first inclination angle of the second abutting surface is equal to the second inclination angle of the corresponding locking tongue;

[0025] The second inclination angle of the locking tongue near the outer side of the vehicle body is smaller than the second inclination angle of the locking tongue near the inner side of the vehicle body.

[0026] To solve the problem of how to perform battery swapping in the limited battery swapping height space of the chassis, the present invention has the following advantages:

[0027] The vehicle chassis is rotatably connected to the rotating part through the first fixed shaft. The rotating part is arranged on one side close to the chassis, and the height space limit is small, thus avoiding digging a trench in the battery swapping station and reducing the construction cost of the battery swapping station. Compared with using multiple screws to fix the power battery, the screws are prone to slipping threads after a long service time, and regular replacement increases the maintenance cost. In the present invention, the locking tongue is engaged with the locking groove of the rotating part. The locking tongue and the locking groove are wedge-shaped bodies that cooperate with each other, and have a relatively long service life. The axial displacement of the second fixed shaft is restricted by the abutting fit between the first abutting surface and the first locking surface, and the radial displacement of the second fixed shaft is restricted by the abutting of the second abutting surface, that is, the inclined groove surface of the locking groove, and the second locking surface of the locking tongue. One end of the second fixed shaft away from the locking tongue can be detachably connected to the power battery, so as to realize the locking and fixing of the power battery, and the maintenance cost is relatively low. The processing errors of the chassis and the battery box frame of the power battery are relatively large, and the number of locking mechanisms is large. A certain redundancy is required for the locking distance of the locking assembly. According to different processing errors, the magnitude of the pressing force of the wedge-shaped surface between the locking tongue and the locking groove can be different, so as to improve the stability of fixing the power battery. Description of the Drawings

[0028] Figure 1 Shows a schematic diagram of a power battery locking assembly of an embodiment from a first perspective;

[0029] Figure 2 Shows Figure 1 A schematic diagram of the power battery locking assembly in the embodiment from a second perspective;

[0030] Figure 3 Shows a front view schematic diagram of a power battery locking assembly of an embodiment;

[0031] Figure 4 Shows a top view schematic diagram of a power battery locking assembly of an embodiment;

[0032] Figure 5 Shows Figure 4 A - A cross - sectional schematic diagram of the power battery locking assembly in the embodiment;

[0033] Figure 6 Shows a partial schematic diagram of a power battery locking assembly of an embodiment;

[0034] Figure 7 Shows Figure 6 A top view schematic diagram of the power battery locking assembly in the embodiment;

[0035] Figure 8 Shows Figure 6 A front view schematic diagram of the power battery locking assembly in the embodiment;

[0036] Figure 9Schematic diagram of the second locking unit of the power battery locking assembly according to an embodiment is shown.

[0037] Reference numerals: 10 first locking unit; 11 first fixed shaft; 12 rotating part; 13 receiving groove; 14 locking groove; 15 first contact surface; 16 second contact surface; 17 driving part; 18 gear; 20 second locking unit; 21 second fixed shaft; 22 locking tongue; 23 first locking surface; 24 second locking surface. Detailed implementation manners

[0038] The present disclosure will now be described with reference to several exemplary embodiments. It should be understood that the description of these embodiments is only for enabling those of ordinary skill in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0039] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. are based on the orientation or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to being able to represent orientation or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] Currently, chassis battery swapping is restricted by the site and has certain requirements for the height space for battery swapping. A swapping station often needs to dig a trench or use a jack to ensure sufficient height space for battery swapping, which will undoubtedly increase the construction cost of the swapping station. In order to reduce the construction cost of the swapping station and the requirements for the height space for chassis battery swapping, in this embodiment, a power battery locking assembly is disclosed. As Figure 1 shown, the power battery locking assembly may include a first locking unit 10 and a second locking unit 20.

[0041] As Figure 4 shown, the first locking unit 10 includes a first fixed shaft 11 and a rotating part 12. As Figure 5 shown, the first fixed shaft 11 is rotatably connected to the rotating part 12. The first fixed shaft 11 is used for detachably connecting to the chassis of the vehicle. As Figure 1 、 Figure 2 shown, the rotating part 12 is provided with a receiving groove 13 and a locking groove 14 with intersecting opening directions. The receiving groove 13 is used for receiving the second fixed shaft 21 and the locking tongue 22 of the second locking unit 20, and the locking groove 14 is used for limiting the locking tongue 22. The axis of rotation of the rotating part 12 is parallel to the opening direction of the receiving groove 13. The receiving groove 13 is located at the center of rotation of the rotating part 12. The opening of the receiving groove 13 is strip-shaped, so that the rotating part 12 can be locked and unlocked with the locking tongue 22 by rotation. The locking groove 14 communicates with the receiving groove 13. As Figure 3 shown, the first locking unit 10 has a first contact surface 15. The first contact surface 15 extends into the receiving groove 13 and the locking groove 14. The axis of rotation of the rotating part 12 intersects the first contact surface 15. The rotating part 12 has a second contact surface 16. The second contact surface 16 is located in the locking groove 14. The first contact surface 15 and the second contact surface 16 can be arranged at intervals. The axis of rotation of the rotating part 12 intersects the extension surface of the second contact surface 16 and the included angle is an acute angle. The distance between the first contact surface 15 and the second contact surface 16 gradually increases or decreases along the circumferential direction around the first fixed shaft 11. The second contact surface 16 can be an inclined surface or a spiral surface surrounding the first fixed shaft 11 in the circumferential direction. As Figure 6 、 Figure 7 shown, two second contact surfaces 16 can be arranged at intervals on the rotating part 12, and the inclination directions of the two second contact surfaces 16 are opposite, so as to facilitate the formation of a tight fixing on the locking tongue 22 and maintain relative rest with the locking tongue 22.

[0042] As Figure 6 、 Figure 7 shown, the second locking unit 20 includes a second fixed shaft 21 and a locking tongue 22. The locking tongue 22 is fixedly connected to one end of the second fixed shaft 21. The locking tongue 22 protrudes from the circumferential surface of the second fixed shaft 21, that is, the locking tongue 22 extends radially along the second fixed shaft 21. As Figure 8 、Figure 9 As shown, the locking tongue 22 has a first locking surface 23 and a second locking surface 24 that face away from each other. The angle between the second locking surface 24 and the axis of the second fixed shaft 21 is an acute angle. The distance between the first locking surface 23 and the second locking surface 24 gradually increases or decreases along the circumferential direction around the second fixed shaft 21. Thus, the cross-section of the locking tongue 22 is a wedge-shaped surface, and the orientation of the inclined surface of the locking tongue 22 can be opposite to the orientation of the second abutting surface 16, which is convenient for better abutting and fitting with the second abutting surface 16.

[0043] Among them, the power battery locking assembly has a locking state and an unlocking state. In the locking state, the second fixed shaft 21 is inserted into the receiving groove 13, the locking tongue 22 is located in the locking groove 14, the first locking surface 23 is in contact with the first abutting surface 15, and the second locking surface 24 is in contact with the second abutting surface 16. Thus, the first locking unit 10 limits the second locking unit 20, and the first abutting surface 15 and the second abutting surface 16 jointly limit the axial displacement of the second locking unit 20, and the second abutting surface 16 limits the circumferential displacement of the second locking unit 20. In the unlocking state, the first locking unit 10 is separated from the second locking unit 20. When unlocking, the rotating part 12 can be driven to rotate, the second locking surface 24 slides along the inclined direction of the second abutting surface 16, and at the same time the locking tongue 22 gradually enters the receiving groove 13, and then the second locking unit 20 is separated from the receiving groove 13 by relying on gravity, so that the second locking unit 20 disengages from the first locking unit 10.

[0044] Through the above settings, the rotating part 12 is arranged close to the vehicle chassis, thereby shortening the overall length of the power battery locking assembly, reducing the requirement for the height space of battery swapping, so that the battery swapping station does not need to change the height space requirement for chassis battery swapping by means such as digging a trench or using a jack, and reducing the construction cost of the battery swapping station. At the same time, compared with using multiple screws to fix the power battery, it is difficult to align multiple screw holes or elastic pins at the same time. By using the spiral engagement method of the locking tongue 22 and the rotating part 12, it is easy to disassemble and install, and the maintenance cost is relatively low. Moreover, the tightening force between the second abutting surface 16 and the second locking surface 24 changes less during long-term use, and the reliability is higher. In actual use, the processing errors of the chassis and the battery box frame of the power battery are relatively large, and the number of locking mechanisms is large. A certain redundancy is required for the locking distance of the locking mechanism. According to different processing errors, in this embodiment, when multiple power battery locking assemblies lock and fix the power battery, the tightening force of the wedge-shaped surfaces between the first locking unit 10 and the second locking unit 20 of each locking assembly can be different. Therefore, the mechanical tolerance of the power battery locking assembly in this embodiment is relatively large, which is convenient for multiple second locking units 20 on each battery box to be aligned and adapted to the first locking unit 10 on the vehicle when installing different battery boxes.

[0045] In this embodiment, as Figure 2 ,Figure 3 , Figure 5 , Figure 6 As shown in Figure 6 , the first locking unit 10 may further include a driving part 17. The driving part 17 may be a gear 18, which is driven by a servo motor in meshing transmission with the gear 18, or by other driving methods such as a hydraulic press or a pneumatic motor in meshing transmission with a rack. The gear 18 is integrally formed or fixedly connected with the rotating part 12, so as to drive the rotating part 12 to rotate, realizing the locking and separation of the second locking unit 20. The outer diameter of the gear 18 is equal to the outer diameter of the rotating part 12, thereby reducing the occupation of the vehicle chassis space and avoiding conflicts with other vehicle mechanisms.

[0046] In this embodiment, as Figure 2 shown, the gear 18 is an incomplete gear 18. The locking groove 14 and the projection of the gear 18 on one end face of the rotating part 12 along its own axis are arranged in a staggered manner. Since the locking groove 14 is formed on the rotating part 12, the axial thickness of the rotating part 12 at the position where the locking groove 14 is formed is reduced, so the structural strength is relatively poor. Through the above setting, when the power battery locking assembly is in the locked state, it can ensure that the structural strength of the rotating part 12 near the locking tongue 22 meets the requirements, and the service life of the rotating part 12 is extended.

[0047] In this embodiment, as Figure 6 , Figure 7 shown, when the angle between the axis of the locking tongue 22 along the radial direction of the second fixed shaft 21 and the axis in the length direction of the receiving groove 13 is 90°, the locking between the first locking unit 10 and the second locking unit 20 is relatively stable. And the more the number of locking tongues 22, the smaller the angle required for locking rotation, and the easier it is to jolt and fall off. In order to prevent the first locking unit 10 and the second locking unit 20 from being separated due to jolting, two locking tongues 22 may be arranged oppositely. As Figure 6 shown, the gear 18 includes two incomplete gears 18. In the locked state, the two locking tongues 22 and the projections of the two incomplete gears 18 on one end face of the rotating part 12 along its own axis are arranged in a staggered manner. Thus, while ensuring the structural strength of the rotating part 12 near the locking tongue 22 when the power battery locking assembly is in the locked state and extending the service life of the rotating part 12, the driving force for the rotation of the rotating part 12 is more uniform and stable.

[0048] In this embodiment, as Figure 6 , Figure 8As shown, the locking tongues 22 correspond to the second abutting surfaces 16 one by one, facilitating the second abutting surfaces 16 to abut against the locking tongues 22 to prevent the second locking unit 20 from disengaging. The angle between the second abutting surface 16 and the axis of the first fixed shaft 11 is the first inclination angle. The angle between the second locking surface 24 of the locking tongue 22 and the axis of the second fixed shaft 21 is the second inclination angle. The first inclination angle of the second abutting surface 16 is equal to the second inclination angle of the corresponding locking tongue 22. This ensures the contact area between the second abutting surface 16 and the corresponding locking tongue 22, enabling the locking tongue 22 to closely cooperate with the second abutting surface 16 and ensuring stable locking.

[0049] The first inclination angles corresponding to the two second abutting surfaces 16 have a difference, that is, the slopes of the two second abutting surfaces 16 are different, so that the abutting forces borne by the second locking surfaces 24 of the respective corresponding locking tongues 22 are different. In this way, different abutting forces can be designed according to specific needs to meet various design requirements.

[0050] In this embodiment, as Figure 8 shown, the distance between the second abutting surface 16 and the teeth of the incomplete gear 18 is the first distance, that is, the distance between the center of the second abutting surface 16 and the teeth of the incomplete gear 18 along the circumferential direction of the rotating part 12. The first distance is negatively correlated with the first inclination angle. The smaller the first distance, the larger the first inclination angle. Thus, while ensuring that the number of teeth of the incomplete gear 18 meets the requirements of mechanical drive, the structural strength of the part of the rotating part 12 close to the locking tongue 22 is ensured, and the reliability of the rotating part 12 is improved.

[0051] In this embodiment, as Figure 7 shown, the opening width of the receiving groove 13 is greater than the diameter of the second fixed shaft 21, so as to ensure that the second fixed shaft 21 can smoothly extend into the receiving groove 13, improve the mechanical tolerance, and reduce the time for the second fixed shaft 21 to align with the opening of the receiving groove 13.

[0052] In this embodiment, this embodiment discloses a new energy vehicle. The new energy vehicle includes a power battery locking assembly according to any one of the above embodiments. The new energy vehicle may further include a vehicle body, a chassis, wheels, and a power battery box. The chassis is detachably connected to the vehicle body. The wheels are rotatably connected to the chassis. The first fixed shaft 11 of the power battery locking assembly is detachably connected to the chassis. The second fixed shaft 21 of the power battery locking assembly is detachably connected to the power battery box. The chassis can quickly lock and separate the power battery box through the power battery locking assembly, so as to achieve the purpose of rapid battery swapping and ensure the efficiency of the new energy vehicle to supplement energy.

[0053] In this embodiment, there are two relatively arranged locking tongues 22 of the power battery locking assembly. The arrangement direction of the two locking tongues 22 is perpendicular to the driving direction of the vehicle. Thus, when the body of the new energy vehicle sways left and right, different jacking forces are provided through different slopes of the second contact surface 16 to avoid the shaking of the power battery box, so that the locking stability of the power battery locking assembly for the power battery box is relatively high. The new energy vehicle in this embodiment can be applied to commercial vehicles. The front and rear wheelbases of commercial vehicles are relatively large, while the left and right wheelbases are relatively short. Therefore, on bumpy roads, the front and rear bumping degrees are relatively small, while the left and right bumping degrees are relatively large. This embodiment can resist the left and right bumping and shaking of the vehicle, thereby maximizing the anti-vibration performance of commercial vehicles.

[0054] In this embodiment, the locking tongues 22 and the second contact surfaces 16 are in one-to-one correspondence, which is convenient for the second contact surfaces 16 to lock the locking tongues 22 and avoid the second locking unit 20 from coming out. The included angle between the second contact surface 16 and the axis of the first fixed shaft 11 is the first inclination angle. The included angle between the second locking surface 24 of the locking tongue 22 and the axis of the second fixed shaft 21 is the second inclination angle. The first inclination angle of the second contact surface 16 is equal to the second inclination angle of the corresponding locking tongue 22. Thus, the contact area between the second contact surface 16 and the corresponding locking tongue 22 is ensured, so that the locking tongue 22 can be closely matched with the second contact surface 16 to ensure stable locking.

[0055] The second inclination angle of the locking tongue 22 near the outer side of the vehicle body is smaller than the second inclination angle of the locking tongue 22 near the inner side of the vehicle body. That is, among the two power battery locking assemblies at both ends of the axis perpendicular to the driving direction of the vehicle of the power battery box, the slope of the outer locking tongue 22 can be made higher and the abutting force can be made larger, so as to form a larger force arm stroke with a larger distance to provide stable support and further ensure the stability of the power battery box.

[0056] It should be understood that the "this embodiment" mentioned in the present invention refers to the current technical points. Multiple "this embodiments" can be the same embodiment or different embodiments.

[0057] Those of ordinary skill in the art can understand that the above embodiments are specific cases for implementing the present disclosure, and in actual applications, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A power battery locking assembly, characterized in that, The power battery locking assembly includes: A first locking unit, the first locking unit includes a first fixed shaft and a rotating part; the first fixed shaft is rotatably connected to the rotating part; the first fixed shaft is used for detachably connecting to the chassis of the vehicle; an accommodating groove and a locking groove with intersecting opening directions are formed on the rotating part; the axis of rotation of the rotating part is parallel to the opening direction of the accommodating groove; the accommodating groove is located at the center of rotation of the rotating part; the opening of the accommodating groove is strip-shaped; the locking groove communicates with the accommodating groove; the first locking unit has a first abutting surface; the first abutting surface extends into the accommodating groove and the locking groove; the axis of rotation of the rotating part intersects the first abutting surface; the rotating part has a second abutting surface; the second abutting surface is located in the locking groove; the axis of rotation of the rotating part intersects the extension surface of the second abutting surface and the included angle is an acute angle; the distance between the first abutting surface and the second abutting surface gradually increases or decreases along the circumferential direction around the first fixed shaft; the first locking unit further includes a driving part; the driving part includes a gear; the gear is integrally formed with or fixedly connected to the rotating part; the outer diameter of the gear is equal to the outer diameter of the rotating part; the gear is an incomplete gear; the locking groove and the projection of the gear on one end surface of the rotating part along its own axis are arranged in a staggered manner; A second locking unit, the second locking unit includes a second fixed shaft and a locking tongue; the locking tongue is fixedly connected to one end of the second fixed shaft; the locking tongue protrudes from the circumferential surface of the second fixed shaft; the locking tongue has a first locking surface and a second locking surface facing away from each other; the included angle between the second locking surface and the axis of the second fixed shaft is an acute angle; the distance between the first locking surface and the second locking surface gradually increases or decreases along the circumferential direction around the second fixed shaft; there are two locking tongues arranged oppositely; the gear includes two incomplete gears; Wherein, the power battery locking assembly has a locking state and an unlocking state; In the locking state, the second fixed shaft penetrates through the accommodating groove, the locking tongue is located in the locking groove, the first locking surface is in contact with the first abutting surface, and the second locking surface is in contact with the second abutting surface; in the locking state, the projections of the two locking tongues and the two incomplete gears on one end surface of the rotating part along its own axis are arranged in a staggered manner; the locking tongue corresponds to the second abutting surface one by one; the included angle between the second abutting surface and the axis of the first fixed shaft is a first inclination angle; the included angle between the second locking surface of the locking tongue and the axis of the second fixed shaft is a second inclination angle; the first inclination angle of the second abutting surface is equal to the second inclination angle of the corresponding locking tongue; there is a difference in the first inclination angles corresponding to the two second abutting surfaces; In the unlocking state, the first locking unit is separated from the second locking unit.

2. The power battery locking assembly according to claim 1, wherein, The distance between the second abutting surface and the tooth of the incomplete gear is a first distance; the first distance is negatively correlated with the first inclination angle.

3. The locking assembly for a power battery according to claim 2, wherein The opening width of the receiving groove is greater than the diameter of the second fixed shaft.

4. A new energy vehicle, characterized in that, The new energy vehicle includes: A vehicle body; A chassis detachably connected to the vehicle body; Wheels rotatably connected to the chassis; The locking assembly for a power battery according to any one of claims 1-3; the first fixed shaft of the locking assembly for a power battery is detachably connected to the chassis; A power battery box; the second fixed shaft of the locking assembly for a power battery is detachably connected to the power battery box.

5. The new energy vehicle according to claim 4, wherein There are two locking tongues arranged opposite to each other; the arrangement direction of the two locking tongues is perpendicular to the driving direction of the vehicle.

6. The new energy vehicle according to claim 5, wherein The locking tongues correspond to the second abutting surfaces one by one; the included angle between the second abutting surface and the axis of the first fixed shaft is a first inclination angle; the included angle between the second locking surface of the locking tongue and the axis of the second fixed shaft is a second inclination angle; the first inclination angle of the second abutting surface is equal to the second inclination angle of the corresponding locking tongue; The second inclination angle of the locking tongue near the outer side of the vehicle body is smaller than the second inclination angle of the locking tongue near the inner side of the vehicle body.

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