Quick lock change assembly and locking device using same

Abstract

The present application provides a quick lock change assembly including an outer case, a quick change bolt, an unlock ejector pin, and a bolt fixing ring, wherein the outer case has a hollow cavity formed therein, the quick change bolt is disposed in the cavity, the quick change bolt includes a guide stage, a thread fixing stage, a flange portion, and a tool fitting stage, a through hole is formed inside the quick change bolt along an axial direction, a first anti-loosening tooth is formed in the guide stage, and rotation of the quick change bolt is restricted by locking the first anti-loosening tooth, the unlock ejector pin is configured to be inserted and held in the through hole, a length of the unlock ejector pin is longer than a length of the through hole, when an external tool is inserted into the tool fitting stage, the external tool can push the unlock ejector pin to move it along the through hole and extend from the guide stage to unlock the first anti-loosening tooth, and the bolt fixing ring is fixed to the outer case and configured to lock the flange portion.

Description

[Technical Field]

[0001] The present application relates to the field of locking technology, and more particularly to a quick lock change assembly for a battery and a locking device using the same. [Background technology]

[0002] In recent years, with the rapid development of new energy vehicles, the number of new energy vehicles sold worldwide has been increasing. However, the power batteries of new energy vehicles require a long charging time, and this problem is generally solved by using a method of quickly replacing the power battery. This battery replacement mode achieves the purpose of powering the new energy vehicle by simply replacing the battery pack, which can quickly replenish electrical energy and is also useful for battery maintenance and extending the service life.

[0003] However, current locking devices for locking battery packs to vehicle bodies require a large amount of space, so there is a demand for a locking device that requires less space, achieves excellent fastening performance, and has a highly reliable locking structure. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a quick lock change assembly and a locking device using the same. [Means for solving the problem]

[0005] According to a first aspect, there is provided a quick lock change assembly including an outer case, a quick change bolt, an unlock ejector pin, and a bolt fixing ring, wherein the outer case has a hollow cavity formed therein, the quick change bolt is disposed in the cavity, the quick change bolt includes a guide stage, a thread fixing stage, a flange portion, and a tool fitting stage, a through hole formed axially inside the quick change bolt, a first locking tooth is formed in the guide stage, and rotation of the quick change bolt is limited by locking the first locking tooth, the unlock ejector pin is configured to be inserted into and held in the through hole, the length of the unlock ejector pin is longer than the length of the through hole, when an external tool is inserted into the tool fitting stage, the external tool pushes the unlock ejector pin to move it along the through hole and extend from the guide stage, thereby unlocking the first locking tooth, and the bolt fixing ring is fixed to the outer case and configured to fasten the flange portion. The quick release lock assembly design of the present application significantly reduces the installation space required for the locking device while providing excellent fastening performance and reliable anti-loosening and anti-rotation.

[0006] In some embodiments, the guide step has a frustum shape, and the first locking tooth is disposed on the conical surface of the guide step, which can better guide the installation of the quick-change bolt.

[0007] In some embodiments, a boss is formed on the top of the outer case, and the outer ring of the boss has a toothed structure. By utilizing the interference fit of the toothed structure, the outer case of the quick lock change assembly can be press-fit into the battery pack beam, thereby realizing rapid installation of the quick lock change assembly and the battery pack beam.

[0008] In some embodiments, a stepped portion is formed on the inner side of the bolt fixing ring, and the stepped portion fastens the flange portion. With this configuration, it is possible to prevent the quick change bolt from slipping out of the outer case.

[0009] In some embodiments, the unlocking ejector pin has a head and a neck-tight portion, a protrusion is formed on the inner wall of the through hole, the head is configured to engage with the protrusion to hold the unlocking ejector pin in the through hole, and the neck-tight portion is configured to move freely via the protrusion. With this configuration, the unlocking ejector pin can slide within the through hole within a predetermined range without coming out of the through hole.

[0010] According to a second aspect, there is provided a nut assembly including a quick-change nut, a locking mechanism, and an elastic member, wherein the quick-change nut includes a nut body having a threaded hole extending therethrough, a locking recess provided on the side of the locking mechanism facing the threaded hole, a second anti-loosening tooth formed on the inner surface of the locking recess, and the elastic member combined with the locking mechanism to bring the locking mechanism closer to the quick-change nut. The configuration of the nut assembly of the present application makes it possible to achieve excellent fastening performance and highly reliable prevention of loosening and rotation while significantly reducing the installation space required for the locking device.

[0011] In some embodiments, the nut assembly further includes a cover plate and a base, the cover plate is fixedly connected to the base, and a storage space is formed between the cover plate and the base, the quick-change nut further includes a base portion connected to the nut body, the base portion is disposed within the storage space, an opening is formed in the base through which the nut body extends, and the storage space is disposed to allow the quick-change nut to move within a predetermined range. This configuration allows for better centering of the quick-change bolt and the quick-change nut when the axis of the quick-change bolt and the axis of the quick-change nut are not aligned.

[0012] In some embodiments, a guide portion is formed on the side of the locking mechanism facing the cover plate, a guide hole that is guided and engaged with the guide portion is formed in the cover plate, the elastic member is fitted into the guide portion, and both ends of the elastic member abut against the cover plate and the locking mechanism, respectively. With this configuration, it is possible to position the elastic member while guiding the movement of the locking mechanism.

[0013] In some embodiments, a flange is provided on the base and / or the cover plate, and the flange is used to limit rotation of the quick-change nut relative to the base and / or the cover plate. By providing the flange, it is possible to prevent the quick-change nut from rotating relative to the base and / or the cover plate when the quick-change bolt and the quick-change nut are tightened.

[0014] In some embodiments, a protrusion is formed on the base surface, and a locking groove is formed on the locking mechanism to engage with the protrusion. This configuration positions the locking mechanism and prevents the locking mechanism from rotating relative to the quick-change nut.

[0015] According to a third aspect, there is provided a locking device including the quick-change assembly and the nut assembly, wherein the quick-change bolt is configured such that when the quick-change nut is fastened to the quick-change bolt, the guide step passes through the threaded hole of the quick-change nut and abuts against the inner surface of the locking recess, and the second locking tooth engages with the first locking tooth to lock or separates to unlock. By using the quick-change assembly and nut assembly of the present application, it is possible to significantly reduce the installation space required for the locking device while achieving excellent fastening performance and highly reliable prevention of loosening and rotation.

[0016] In some embodiments, the first locking tooth and the second locking tooth have an oblique tooth structure. By using locking teeth with an oblique tooth structure, loosening of the quick-change bolt can be better prevented.

[0017] In some embodiments, the inclination angle of the first locking tooth and the second locking tooth is between 30° and 60°. By setting the inclination angle of the locking teeth between 30° and 60°, the effect of preventing loosening and rotation can be maximized.

[0018] According to a fourth aspect, there is provided a vehicle including a battery pack beam, a body beam, and the locking device, wherein the battery pack beam has a hole formed therein, the body beam has a groove formed therein, the nut assembly is fixed in the groove of the body beam, and the quick lock-change assembly is fixed in the hole of the battery pack beam. This configuration can further reduce the installation space required for the locking device.

[0019] The locking device of the present application, and in particular the quick lock change assembly of the present application, can solve the problem of the installation space required for the quick lock release, realize easy assembly and replacement, and simplifies assembly and alignment, resulting in high assembly efficiency.

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application, and the exemplary embodiments and the description thereof are used to interpret the present application and do not constitute undue limitations on the present application. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic exploded view of a quick lock change assembly in a locking device according to some embodiments of the present application. FIG. [Figure 2] FIG. 2 is a schematic exploded view of a nut assembly in a locking device according to some embodiments of the present application. [Figure 3] 1 is a cross-sectional view of a locking device including a quick lock change assembly and a nut assembly according to some embodiments of the present disclosure. [Figure 4] 10 is a schematic diagram showing a state in which a quick lock change assembly and a nut assembly of a locking device according to some embodiments of the present application are attached to a battery pack beam and a vehicle body beam, respectively. FIG. [Figure 5] 10 is a cross-sectional view of the quick lock change assembly after it has been attached to the nut assembly. FIG. [Figure 6] 10 is a schematic diagram showing a state after a battery pack beam has been locked to a vehicle body beam using a locking device according to some embodiments of the present application. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative efforts fall within the scope of protection of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the specification of the present application are intended merely to describe specific embodiments and are not intended to limit the present application. The terms "comprise" and "have" and their equivalents in the specification, claims, and drawings of the present application are intended to be non-exclusive. Terms such as "first," "second," and the like in the specification, claims, and drawings of the present application are used to distinguish between different objects and are not used to describe a particular order or hierarchy.

[0024] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Appearances of the term "embodiment" in various places in this specification do not necessarily refer to the same embodiment, nor do they refer to embodiments that are mutually exclusive, independent, or alternative to other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that embodiments described herein can be combined with other embodiments.

[0025] It should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "attach," "connected," "connection," and "attachment" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0026] The term "and / or" in this application merely describes the relationship between related objects and indicates that three types of relationships can exist. For example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. In this application, the symbol " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0027] As used herein, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0028] The battery referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module, a battery pack, or the like.

[0029] The present application provides a quick lock change assembly that requires a small space, achieves excellent fastening performance, and has a highly reliable anti-loosening structure, and a locking device using the same.

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0031] The locking device 300 of the present application includes a quick lock change assembly 100 and a nut assembly 200.

[0032] FIG. 1 is a schematic exploded view of a quick lock change assembly in a locking device according to some embodiments of the present application. FIG. 2 is a schematic exploded view of a nut assembly in a locking device according to some embodiments of the present application. FIG. 3 is a cross-sectional view of a locking device including a quick lock change assembly and a nut assembly according to some embodiments of the present application. FIG. 4 is a schematic view showing a state in which the quick lock change assembly and the nut assembly of a locking device according to some embodiments of the present application are attached to a battery pack beam and a vehicle body beam, respectively. FIG. 5 is a cross-sectional view of a state after the quick lock change assembly has been attached to the nut assembly. FIG. 6 is a schematic view showing a state in which the battery pack beam has been locked to the vehicle body beam using a locking device according to some embodiments of the present application.

[0033] First, the structure of the quick lock change assembly 100 of the locking device 300 of the present invention will be described with reference to FIGS.

[0034] 1 and 3, the quick change assembly 100 includes an outer case 101, a quick change bolt 103, an unlocking ejector pin 105, and a bolt fixing ring 107. The outer case 101 has a generally cylindrical structure, with a hollow cavity formed therein and an opening 109 formed in the top wall. In some embodiments, the upper part of the outer case 101 is further formed with a boss 111, and the outer ring of the boss 111 has a toothed structure for press-fitting the outer case 101 into the battery pack beam 404 of the new energy vehicle by interference fit, as will be described later.

[0035] The quick-change bolt 103 is disposed in the cavity and configured to be axially movable so as to protrude from the cavity or be housed within the cavity through the opening 109. In other words, the quick-change bolt 103 forms a clearance fit with the outer case 101.

[0036] The quick-change bolt 103 includes a guide section 113, a thread-locking section 115, a flange 117, and a tool engagement section 119. The guide section 113 is located at the front end of the thread-locking section 115. A first locking tooth 121 is formed on the guide section 113. In some embodiments, the guide section 113 may be frustum-shaped. In this case, the first locking tooth 121 may be provided on the conical surface of the guide section 113. The thread-locking section 115 is provided with a screw thread and is used to engage with a quick-change nut 207 (described below), thereby achieving locking.

[0037] The tool engaging stage 119 is configured to engage with a tool, and when the battery is locked or unlocked, the tool drives the rotation of the tool engaging stage 119 to tighten or loosen the quick-change bolt 103. Although not shown, as will be understood by those skilled in the art, for example, the tool engaging stage 119 may have a polygonal through-hole formed therein, and the tip of the tool may be a polygonal prism that fits therewith, thereby allowing the tool to drive the rotation of the tool engaging stage 119.

[0038] A through hole 301 is formed in the axial direction inside the quick-change bolt 103. Specifically, as shown in Fig. 3, the through hole 301 passes through the guide section 113, the thread fixing section 115, and the flange portion 117 of the quick-change bolt 103. The unlock ejector pin 105 is configured to be inserted into and held in the through hole 301. In other words, the unlock ejector pin 105 can slide within a predetermined range along the through hole 301 and is held in the through hole 301 without coming out of the through hole 301.

[0039] 1 and 3 , the unlock ejector pin 105 has a head 123 and a neck-tight portion 125. Correspondingly, a protrusion 303 is formed on the inner wall of the through-hole 301. The head 123 of the unlock ejector pin 105 is configured to engage with the protrusion 303 to hold the unlock ejector pin 105 within the through-hole 301. The neck-tight portion 125 of the unlock ejector pin 105 is configured to move freely through the protrusion 303. For example, there may be an interference fit between the head 123 of the unlock ejector pin 105 and the protrusion 303, and there may be a clearance fit between the neck-tight portion 125 of the unlock ejector pin 105 and the protrusion 303. As a result, when the head 123 of the unlocking ejector pin 105 is inserted into the protrusion 303, the protrusion 303 catches on the head 123, preventing the unlocking ejector pin 105 from slipping out of the through-hole 301. At the same time, the neck tight portion 125 can move freely via the protrusion 303, allowing the unlocking ejector pin 105 to slide within the through-hole 301 within a predetermined range.

[0040] The length of the unlock ejector pin 105 is set to be longer than the length of the through hole 301. That is, when attaching or detaching the quick-change bolt 103, if a tool is inserted into the tool fitting step 119 and butted against the bottom of the unlock ejector pin 105, the head 123 of the unlock ejector pin 105 will protrude a predetermined length from the tip of the quick-change bolt 103.

[0041] The bolt fixing ring 107 is fixed to the outer case 101. In some embodiments, the bolt fixing ring 107 can be locked to the outer case 101 by a threaded connection. The bolt fixing ring 107 is configured to hold the flange portion 117 of the quick change bolt 103 and prevent the quick change bolt 103 from coming off the outer case 101 of the quick change assembly 100. In some embodiments, a stepped portion 127 may be formed on the inside of the bolt fixing ring 107, and the diameter of the space surrounded by the stepped portion 127 can be smaller than the diameter of the disk formed by the flange portion 117. This allows the stepped portion 127 to support the flange portion 117 before installing or after removing the quick change bolt 103, preventing the quick change bolt 103 from coming off the outer case 101.

[0042] Next, the structure of the nut assembly 200 of the locking device of the present invention will be described with reference to FIGS.

[0043] The nut assembly 200 includes a cover plate 201, an elastic member 203, a locking mechanism 205, a quick-change nut 207, and a base 209. The quick-change nut 207 has a nut body 211 and a base surface 213 connected to the nut body 211. A threaded hole that engages with the quick-change bolt 103 is formed in the nut body 211.

[0044] The locking mechanism 205 is disposed on the quick-change nut 207. A locking recess 305 is provided on the side of the locking mechanism 205 facing the threaded hole, and a second locking tooth 307 is formed on the inner surface of the locking recess 305. The second locking tooth 307 is adapted to be engaged with the first locking tooth 121 provided on the guide section 113 of the quick-change bolt 103 for locking or disengaging for unlocking. In other words, when the quick-change nut 207 is tightened onto the quick-change bolt 103, the guide section 113 passes through the threaded hole of the quick-change nut 207 and abuts against the inner surface of the locking recess 305, thereby engaging the first locking tooth 121 with the second locking tooth 307. In some embodiments, the first locking tooth 121 and the second locking tooth 307 have oblique tooth structures. In these embodiments, the inclination angle of the first locking tooth 121 and the second locking tooth 307 is preferably 30° to 60°.

[0045] In some embodiments, a protrusion 215 is formed on the base surface 213 of the quick-change nut 207. A corresponding locking groove 217 is formed on the locking mechanism 205. The protrusion 215 and the locking groove 217 engage with each other to position the locking mechanism 205 and, for example, prevent the locking mechanism 205 from rotating relative to the quick-change nut 207.

[0046] The elastic member 203 is disposed on the locking mechanism 205 and engages with the locking mechanism 205 to move the locking mechanism 205 closer to the quick-change nut 207. That is, the elastic member 203 biases the locking mechanism 205 toward the quick-change nut 207. In some embodiments, the elastic member 203 may be a spring.

[0047] An accommodation space is formed between the cover plate 201 and the base 209. In some embodiments, the cover plate 201 may be formed in a generally rectangular plate shape with a protruding middle, and the base 209 may be formed in a generally rectangular plate shape, thereby forming the accommodation space between the cover plate 201 and the base 209. In some embodiments, screw holes 219 may be drilled at four corners of the cover plate 201, and through holes 221 may be drilled in the base 209 at positions corresponding to the screw holes 219, so that the cover plate 201 can be fixedly connected to a body beam 402 of a new energy vehicle by, for example, bolts 406 shown in FIG. 4, as will be described later.

[0048] The base surface 213 of the quick-change nut 207 and the locking mechanism 205 are disposed within the accommodation space together with the elastic member 203. The accommodation space is configured to allow the quick-change nut 207 to move within a predetermined range, thereby ensuring alignment between the quick-change nut 207 and the quick lock change assembly 100. An opening 223 through which the nut body 211 extends is formed in the base 209. The diameter of the opening 223 is larger than the diameter of the outer ring of the nut body 211, thereby allowing the quick-change nut 207 to move within the predetermined range, as described above.

[0049] Both ends of the elastic member 203 abut against the cover plate 201 and the locking mechanism 205, respectively. In other words, when the cover plate 201 and the base 209 are locked by the bolt 406, the elastic member 203 is compressed, which pushes the locking mechanism 205 in a direction away from the cover plate 201 and brings the locking mechanism 205 closer to the quick-change nut 207.

[0050] In some embodiments, a guide portion 227 is formed on the side of the locking mechanism 205 opposite the cover plate 201. Correspondingly, a guide hole 229 that guides and engages with the guide portion 227 is formed in the cover plate 201. The guide portion 227 may protrude from the guide hole 229. Again, the diameter of the guide hole 229 is larger than the diameter of the guide portion 227, which allows the quick-change nut 207 to move within a predetermined range, as described above. In these embodiments, the elastic member 203 may be fitted into the guide portion 227.

[0051] In some embodiments, the base 209 is provided with a flange 225 to limit rotation of the quick-change nut 207 relative to the base 209. Alternatively, in other embodiments, the flange 225 may be located on the cover plate 201. Or, both the base 209 and the cover plate 201 may be provided with flanges 225.

[0052] Next, referring to FIG. 4, an embodiment of using the quick lock change assembly 100 and the nut assembly 200 of the present invention to lock a battery pack to the body of a new energy vehicle will be described.

[0053] As shown in Figure 4, a battery pack beam 404 of a new energy vehicle has a substantially circular hole 414 formed in it that corresponds to the shape of the outer case 101 of the quick change assembly 100. During installation, the boss 111 of the outer case 101 is aligned with the circular hole 414, and the outer case 101 of the quick change assembly 100 is pressed into the battery pack beam 404 through a toothed interference fit and then fixed with rivets, thereby achieving a quick installation of the quick change assembly 100 and the battery pack beam 404.

[0054] On the other hand, a substantially rectangular groove 408 corresponding to the outer shape of the nut assembly 200 is formed in the body beam 402 of the new energy vehicle, and the nut assembly 200 is disposed in and supported by the groove 408. A through hole 410 is formed in the groove 408 at a position corresponding to the threaded hole 219 of the nut assembly 200, and a bolt 406 is inserted into the through hole 410 and engaged with the threaded hole 219 to fix the nut assembly 200 in the groove 408 of the body beam 402. An opening 412 is formed in the groove 408 at a position corresponding to the nut body 211 of the nut assembly 200, and the nut body 211 passes through the opening 412 to engage with the quick-change bolt 103 of the quick-change assembly 100 to achieve locking.

[0055] During installation, a tool is inserted into the tool fitting recess 119 of the quick-change bolt 103 to rotate the quick-change bolt 103 and connect the quick-change bolt 103 to the quick-change nut 207. At this time, as described above, the tool abuts against the bottom of the unlock ejector pin 105, so the head 123 of the unlock ejector pin 105 protrudes a predetermined length from the top of the through-hole 301 of the quick-change bolt 103. As a result, when the quick-change bolt 103 is almost completely tightened, the unlock ejector pin 105 pushes up the locking mechanism 205 until the quick-change nut 207 is completely tightened onto the quick-change bolt 103. When the tool is then removed, the force of the unlock ejector pin 105 is released and the locking mechanism 205 returns to its original position due to the elastic member 203. As described above, the elastic member 203 presses the locking mechanism 205 toward the quick-change bolt 103, causing the second locking tooth 307 of the locking mechanism 205 to engage with the first locking tooth 121 on the guide section 113 of the quick-change bolt 103, preventing the quick-change bolt 103 from loosening. Figure 5 shows the state after the quick-change assembly has been attached to the nut assembly. Conversely, when removing the quick-change bolt 103, a tool abuts against the bottom of the unlock ejector pin 105, thereby pushing up the locking mechanism 205 and separating the second locking tooth 307 of the locking mechanism 205 from the first locking tooth 121 on the guide section 113 of the quick-change bolt 103, allowing the quick-change bolt 103 to be removed.

[0056] 6 is a schematic diagram showing the state after the battery pack beam has been locked to the vehicle body beam using the locking device. The locking device of the present application, particularly the integrated quick lock change assembly of the present application, allows for quick assembly of the locking device while simultaneously preventing loosening and rotation.

[0057] Although the locking device has been described above in combination with the power battery of a new energy vehicle, the locking device is not limited to being applied only to the power battery, but can also be applied to other situations requiring locking.

[0058] Finally, it should be noted that the above examples are only for illustrating the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand the following: Those skilled in the art may still modify the technical solutions described in the above examples or substitute some technical features therein with equivalents, but such modifications or substitutions shall not cause the substance of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. The device includes an outer case, a quick-change bolt, an unlocking ejector pin, and a bolt fixing ring; The outer case has a hollow cavity formed therein, The quick-change bolt is disposed in the cavity, and includes a guide section, a thread fixing section, a flange section, and a tool fitting section. A through hole is formed in the quick-change bolt along the axial direction. A first locking tooth is formed in the guide section, and rotation of the quick-change bolt is limited by locking the first locking tooth. the unlocking ejector pin is configured to be inserted into and held in the through hole, the length of the unlocking ejector pin is longer than the length of the through hole, and when an external tool is inserted into the tool fitting stage, the external tool can push the unlocking ejector pin to move it along the through hole and extend it from the guide stage, thereby unlocking the first locking tooth; The bolt fixing ring is fixed to the outer case and configured to fasten the flange portion.

2. 2. The quick lock change assembly according to claim 1, wherein the guide step is frustum-shaped, and the first locking tooth is disposed on the conical surface of the guide step.

3. 3. The quick lock change assembly according to claim 1, wherein a boss is formed on the top of the outer case, and an outer ring of the boss has a toothed structure.

4. 4. The quick lock change assembly according to claim 1, wherein a stepped portion is formed on the inside of the bolt fixing ring, and the stepped portion fastens a flange portion.

5. The quick lock change assembly according to any one of claims 1 to 4, wherein the unlocking ejector pin has a head and a neck-tight portion, a protrusion is formed on the inner wall of the through hole, the head is configured to engage with the protrusion to hold the unlocking ejector pin within the through hole, and the neck-tight portion is configured to move freely via the protrusion.

6. The quick change nut includes a locking mechanism, an elastic member, a cover plate, and a base. The quick change nut includes a nut body, and a threaded hole is formed through the nut body. a locking recess is provided on a side of the locking mechanism facing the screw hole, and a second locking tooth is formed on an inner surface of the locking recess; The elastic member is combined with the locking mechanism to move the locking mechanism closer to the quick-change nut; the cover plate is fixedly connected to the base, and an accommodating space is formed between the cover plate and the base; The quick change nut further includes a base portion connected to the nut body, the base portion being disposed within the accommodating space, and an opening through which the nut body extends is formed in the base. The nut assembly is arranged so that the accommodation space allows the quick change nut to move within a predetermined range.

7. 7. The nut assembly according to claim 6, wherein a guide portion is formed on a side of the locking mechanism facing the cover plate, a guide hole that is in guiding engagement with the guide portion is formed in the cover plate, the elastic member is fitted into the guide portion, and both ends of the elastic member abut against the cover plate and the locking mechanism, respectively.

8. The nut assembly according to claim 6 or 7, wherein the base and / or the cover plate are provided with flanges, and the flanges are used to limit rotation of the quick-change nut relative to the base and / or the cover plate.

9. The nut assembly according to any one of claims 6 to 8, wherein a protrusion is formed on the base surface portion, and an engagement groove that engages with the protrusion is formed on the locking mechanism.

10. A quick lock change assembly according to any one of claims 1 to 5; A nut assembly according to any one of claims 6 to 9; Including, the quick-change bolt is configured so that, when the quick-change nut is tightened onto the quick-change bolt, the guide step passes through the threaded hole of the quick-change nut and abuts against an inner surface of the lock recess, The second locking tooth is adapted to be engaged with the first locking tooth to lock or separated from the first locking tooth to unlock.

11. The locking device of claim 10 , wherein the first locking tooth and the second locking tooth are oblique tooth structures.

12. The locking device according to claim 11, wherein the inclination angle of the first locking tooth and the second locking tooth is between 30° and 60°.

13. a battery pack beam in which a hole is formed; a body beam in which a recessed groove is formed; A locking device according to any one of claims 10 to 12; Including, The nut assembly is fixed in a groove in the body beam, and the quick lock change assembly is fixed in a hole in the battery pack beam.

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