Bushing structure and battery pack comprising same

Abstract

The utility model relates to the technical field of battery production, in particular to a lining structure and a battery pack comprising the same, the lining structure comprises an upper lining and a lower lining, the upper lining comprises an upper cylinder penetrating through a mounting support and an upper abutting portion radially protruding out of the upper cylinder, a first penetrating hole is formed in the upper cylinder, and a second penetrating hole is formed in the lower cylinder; the upper propping part is propped against the mounting bracket; the lower bushing comprises a lower cylinder and a lower abutting part, the lower cylinder penetrates through the mounting support and is connected with the upper cylinder in a sleeving mode, the lower abutting part protrudes out of the lower cylinder in the radial direction, the lower abutting part abuts against the mounting support, a second penetrating hole is formed in the lower cylinder, and the fastener sequentially penetrates through the second penetrating hole and the first penetrating hole. According to the lining structure, the upper lining and the lower lining are matched in the sleeving mode and abut against the mounting support, welding deformation in the welding process can be avoided, the structural strength of the mounting support can be improved, and it is guaranteed that the battery pack is stably connected with the whole vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a bushing structure and a battery pack comprising the same. Background Art

[0002] The battery pack is the core energy source of new energy electric vehicles, and its safety and working reliability directly affect the safety of new energy electric vehicles. In order to improve the battery pack's ability to cope with various working conditions, it is necessary to improve the structural strength of the battery pack and ensure a stable connection between the battery pack and the vehicle.

[0003] Combination Figure 1 As shown, a conventional mounting bracket assembly 100 includes a mounting bracket 110 and a sleeve 120 fixedly mounted on the mounting bracket, wherein the interior of the sleeve 120 is formed with a through hole extending axially therethrough so as to be mounted on a vehicle body mounting beam via a fastener passing therethrough, wherein the mounting bracket 110 includes a first connecting plate 111 and a second connecting plate 112 arranged upper and lower, the sleeve 120 passes through the first connecting plate 111 and the second connecting plate 112 and is welded and fixed thereto, and annular welds are formed at the connection between the sleeve 120 and the first connecting plate 111 and the second connecting plate 112, respectively. However, due to the thermal stress generated by excessive welding, it is difficult to ensure the flatness of the welding joints between the sleeve 120 and the first connecting plate 111 and the second connecting plate 112, thereby affecting the assembly accuracy and connection strength of the battery pack and the entire vehicle.

[0004] In view of this, this application is specially filed. Utility Model Content

[0005] The present application provides a bushing structure and a battery pack including the same, so as to solve the problem of how to improve the safety performance of the battery pack so as to ensure a stable connection between the battery pack and the entire vehicle.

[0006] On the one hand, the present application provides a bushing structure for fixing a mounting bracket connected to a battery pack housing for fasteners to pass through, the bushing structure comprising:

[0007] An upper bushing, comprising an upper cylinder through which the mounting bracket is inserted and an upper stop portion radially protruding from the upper cylinder, wherein a first through hole is formed in the interior of the upper cylinder and passes through along the axial direction thereof, and a lower surface of the upper stop portion abuts against an upper surface of the mounting bracket;

[0008] The lower bushing includes a lower cylinder that passes through the mounting bracket and is sleeved with the upper cylinder, and a lower stop portion that radially protrudes from the lower cylinder, the upper surface of the lower stop portion abuts against the lower surface of the mounting bracket, and a second penetration hole that penetrates along its axial direction is formed inside the lower cylinder so that the fastener can pass through the second penetration hole and the first penetration hole in sequence.

[0009] In some embodiments, the upper cylinder passes through the second through hole from top to bottom and is sleeved with the lower cylinder, and the upper cylinder and the second through hole are interference fit.

[0010] In some embodiments, the second through hole is a stepped hole, which includes a stepped large hole located at the upper part of the lower cylinder and a stepped small hole located at the lower part of the lower cylinder. The upper cylinder passes through the stepped large hole from top to bottom and is sleeved with the lower cylinder. The upper cylinder and the stepped large hole are interference fit.

[0011] In some embodiments, the first one of the upper cylinder and the lower cylinder is provided with a limit block radially protruding from the first one, and the second one of the upper cylinder and the lower cylinder is provided with a limit groove for the limit block to be inserted and installed.

[0012] In some embodiments, the outer peripheral wall of the upper cylinder is provided with a limit block extending radially outward, and the lower cylinder is provided with a limit groove penetrating through the wall of the second through hole for accommodating the limit block.

[0013] In some embodiments, the limiting groove is constructed as a groove with an open top and penetrating through the wall of the second through hole, so that the limiting block can be inserted into the limiting groove from top to bottom and have an interference fit therewith.

[0014] In some embodiments, a plurality of the limit blocks are arranged at intervals along the circumference of the upper cylinder, and a plurality of the limit grooves are arranged at intervals along the circumference of the lower cylinder, so that the limit blocks can be inserted into the corresponding limit grooves.

[0015] In some embodiments, the limiting groove includes a first groove and a second groove disposed below the first groove and connected to the first groove;

[0016] The limiting block is an L-shaped protrusion, the L-shaped protrusion is inserted into the first groove, and the short arm of the L-shaped protrusion is at least partially inserted into the second groove.

[0017] In some embodiments, an annular first vibration-damping groove is provided on the upper portion of the outer peripheral wall of the upper cylinder; and / or

[0018] A second annular vibration-damping groove is arranged at the lower portion of the outer peripheral wall of the lower cylinder.

[0019] On the other hand, the present application also provides a battery pack, comprising the bushing structure as described above.

[0020] After adopting the above technical solution, the present application has the following beneficial effects compared with the prior art.

[0021] 1. The bushing structure in the present application is formed by the upper bushing and the lower bushing being sleeved together and respectively abutting against the upper surface and the lower surface of the mounting bracket. Compared with the prior art, the upper bushing and the lower bushing do not need to be welded and fixed to the mounting bracket, which can not only avoid the occurrence of welding deformation during welding and reduce production costs, but also improve the connection strength between the battery pack and the entire vehicle, thereby enhancing the safety performance of the battery pack.

[0022] 2. The battery pack in the present application includes the bushing structure in the present application, and thus also includes all the above-mentioned advantages of the bushing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a mounting bracket assembly in the prior art;

[0024] Figure 2 is a structural schematic diagram of a bushing structure in an embodiment of the present application;

[0025] Figure 3 is a bottom view of a bushing structure in an embodiment of the present application;

[0026] Figure 4 is an exploded view of a bushing structure in an embodiment of the present application;

[0027] Figure 5 is a front view of an upper bushing in an embodiment of the present application;

[0028] Figure 6 yes Figure 5 Sectional view along AA direction;

[0029] Figure 7 is a front view of a lower bushing in an embodiment of the present application;

[0030] Figure 8 yes Figure 7 Cross-sectional view along the BB direction;

[0031] Fig. 9 is an exploded view of another bushing structure in an embodiment of the present application;

[0032] Fig.10 is a front view of another upper bushing in an embodiment of the present application;

[0033] Fig.11 yes Fig.10 Sectional view along CC direction;

[0034] Fig.12 yes Fig.10 Cross-sectional view along the DD direction;

[0035] Fig.13 is a front view of another lower bushing in an embodiment of the present application;

[0036] Fig.14 yes Fig.13 Sectional view along EE direction;

[0037] Fig.15 yes Fig.13 Cross-sectional view along the FF axis.

[0038] In the figure: 100, mounting bracket assembly; 110, mounting bracket; 111, first connecting plate; 112, second connecting plate; 120, sleeve; 200, bushing structure; 210, upper bushing; 211, upper cylinder; 212, upper stop portion; 213, first through hole; 214, limit block; 2141, long arm; 2142, short arm; 215, first vibration damping groove; 220, lower bushing; 221, lower cylinder; 222, lower stop portion; 223, second through hole; 2231, stepped large hole; 2232, stepped small hole; 224, limit groove; 2241, first groove; 2242, second groove; 225, second vibration damping groove. DETAILED DESCRIPTION

[0039] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0040] In the embodiment of the present application, a bushing structure 200 is provided, which is used to be fixedly connected to the mounting bracket 110 of the battery pack housing for fasteners to pass through. For the specific structure of the bushing structure 200, please refer to Figures 2 to 15 , which includes an upper bushing 210 and a lower bushing 220, wherein the upper bushing 210 includes an upper cylinder 211 through which the mounting bracket 110 is installed and an upper stopper 212 radially protruding from the upper cylinder 211, and the upper cylinder 211 is provided with a first through hole 213 extending axially therethrough, and the lower surface of the upper stopper 212 abuts against the upper surface of the mounting bracket 110; the lower bushing 220 includes a lower cylinder 221 through which the mounting bracket 110 is installed and sleeved with the upper cylinder 211, and a radially protruding upper stopper 212 protruding from the upper cylinder 211. The lower stop portion 222 protrudes from the lower cylinder 221, and the upper surface of the lower stop portion 222 abuts against the lower surface of the mounting bracket 110, so that the mounting bracket 110 is clamped between the upper stop portion 212 and the lower stop portion 222, which is beneficial to reducing the vibration amplitude of the battery pack, and a second through hole 223 is formed in the interior of the lower cylinder 221 along its axial direction, so that the fastener passes through the second through hole 223 and the first through hole 213 in sequence, thereby forming a battery pack assembly.

[0041] According to the applied bushing structure 200, the upper bushing 210 and the lower bushing 220 are sleeved together and respectively abut against the upper surface and the lower surface of the mounting bracket 110. Compared with the prior art, the upper bushing 210 and the lower bushing 220 do not need to be welded and fixed to the mounting bracket 110, which can not only avoid the occurrence of welding deformation during the welding process and reduce production costs, but also improve the connection strength between the battery pack and the entire vehicle, thereby enhancing the safety performance of the battery pack.

[0042] like Figures 2 to 4 and Fig. 9 As shown, the upper cylinder 211 and the lower cylinder 221 are coaxially arranged, which is conducive to the precise fitting of the upper cylinder 211 and the lower cylinder 221, simplifies the assembly process, improves the assembly efficiency of the bushing structure 200, and thus improves the production efficiency of the battery pack.

[0043] like Figures 2 to 4 and Fig. 9 As shown, the first through hole 213 and the second through hole 223 are coaxially arranged, which is conducive to the fastener to quickly pass through the second through hole 223 and the first through hole 213 and be fastened to the vehicle body mounting beam, thereby achieving a fixed connection between the battery pack and the vehicle body mounting beam and improving the assembly efficiency of the battery pack.

[0044] For the specific structure of the mounting bracket 110, please refer to Figure 1 It includes a first connecting plate 111 and a second connecting plate 112 arranged up and down, and the first connecting plate 111 and the second connecting plate 112 are respectively provided with mounting holes. The bushing structure 200 replaces the sleeve 120 and can pass through the mounting holes provided on the first connecting plate 111 and the second connecting plate 112. The fastener passes through the second penetration hole 223 and the first penetration hole 213 in sequence to form a battery pack assembly, thereby fixing the battery pack assembly on the vehicle body mounting beam.

[0045] like Figures 1 to 4 and Fig. 9 As shown, the upper cylinder 211 is inserted into the mounting holes opened on the first connecting plate 111 and the second connecting plate 112 from top to bottom, and the lower surface of the upper stop portion 212 abuts against the upper surface of the first connecting plate 111, while the lower cylinder 221 is inserted into the mounting holes opened on the second connecting plate 112 from bottom to top and is sleeved with the upper cylinder 211, and the upper surface of the lower stop portion 222 abuts against the lower surface of the second connecting plate 112, so that the first connecting plate 111 and the second connecting plate 112 are clamped between the upper stop portion 212 and the lower stop portion 222, which is beneficial to reducing the vibration amplitude of the battery pack, and further the fastener passes through the second through hole 223 and the first through hole 213 in sequence to fix the battery pack on the vehicle body mounting beam to ensure the connection strength between the battery pack and the vehicle body mounting beam.

[0046] like Figures 1 to 4 and Fig. 9As shown, the lower surface of the upper stop portion 212 is in surface contact with the upper surface of the first connecting plate 111, the upper surface of the upper stop portion 212 is in surface contact with the lower surface of the vehicle body mounting beam, and the upper surface of the lower stop portion 222 is in surface contact with the lower surface of the second connecting plate 112, which is beneficial to improving the assembly accuracy of the battery pack and the vehicle body mounting beam.

[0047] like Figures 2 to 4 and Fig. 9 As shown, the upper cylinder 211 passes through the second penetration hole 223 from top to bottom and is sleeved with the lower cylinder 221. The upper cylinder 211 and the second penetration hole 223 are interference fit, and an interference fit is formed between the upper cylinder 211 and the lower cylinder 221. The upper bushing 210 and the lower bushing 220 have good sealing, high assembly reliability, and a stable connection structure, which prevents relative movement between the upper bushing 210 and the lower bushing 220 and affects the structural strength of the battery pack.

[0048] like Figure 8 and Fig.14 As shown, the second through hole 223 is a stepped hole, which includes a large stepped hole 2231 located at the upper part of the lower cylinder 221 and a small stepped hole 2232 located at the lower part of the lower cylinder 221. The upper cylinder 211 passes through the large stepped hole 2231 from top to bottom and is sleeved with the lower cylinder 221. The upper cylinder 211 and the large stepped hole 2231 are interference fit, so that an interference fit is formed between the upper cylinder 211 and the hole wall of the large stepped hole 2231. The upper cylinder 211 and the lower cylinder 221 are sealed and connected to prevent relative movement between the upper bushing 210 and the lower bushing 220.

[0049] The fastener passes through the stepped small hole 2232 , the stepped large hole 2231 and the first penetration hole 213 in sequence and passes out from the first penetration hole 213 , so that the battery pack is fixedly connected to the vehicle body mounting beam located above the upper bushing 210 .

[0050] The aperture of the stepped hole 2232 is equal to the aperture of the first penetration hole 213. Exemplarily, the diameter of the stepped hole 2232 is denoted as D1, and the diameter of the first penetration hole 213 is denoted as D1'. The fastener can be an M10 bolt, and the diameter of the M10 bolt is DM, wherein D1=D1'=(1.4~1.6)×DM, so that the fastener is matched with the stepped hole 2232 and the first penetration hole 213 and the clearance is within a reasonable range, which facilitates the fastener to pass through the stepped hole 2232, the stepped large hole 2231 and the first penetration hole 213 in sequence, which is beneficial to improving the installation and disassembly efficiency of the battery pack and achieving the purpose of quickly replacing the battery pack.

[0051] The diameter of the upper stop portion 212 is equal to the outer diameter of the lower stop portion 222. For example, the outer diameter of the upper cylinder 211 is recorded as D2, the outer diameter of the lower cylinder 221 is recorded as D3, the diameter of the upper stop portion 212 is recorded as D4, and the outer diameter of the lower stop portion 222 is recorded as D4', wherein D2 = (1.75~2)×D1, D3 = (2.5~3)×D1, D4 = D4' = (3.5~4)×D1, so that the lower cylinder 221 is sleeved on the outer side of the upper cylinder 211 and has an interference fit with the upper cylinder 211, the upper stop portion 212 is in contact with the first connecting plate 111 and covers the mounting hole opened on the first connecting plate 111, and the lower stop portion 222 is in contact with the second connecting plate 112 and covers the mounting hole opened on the second connecting plate 112.

[0052] like Figures 9 to 15 As shown, as an optional embodiment, the first of the upper cylinder 211 and the lower cylinder 221 is provided with a limit block 214 radially protruding from the first, and the second of the two is provided with a limit groove 224 for the limit block 214 to be inserted and installed. The limit block 214 is inserted into the limit groove 224 to form a plug-in structure to prevent relative rotation or up and down movement between the upper bushing 210 and the lower bushing 220. The plug-in structure is simple and the limiting effect is significant.

[0053] like Figures 9 to 15 As shown, the outer peripheral wall of the upper cylinder 211 is provided with a limit block 214 extending radially outward, and the lower cylinder 221 is provided with a limit groove 224 penetrating the wall of the second through hole 223 for accommodating the limit block 214. By providing the limit block 214 on the outer peripheral wall of the upper cylinder 211 and the limit groove 224 on the lower cylinder 221 for plugging and cooperating with the limit block 214, a plug-in structure is formed, which not only enables the upper cylinder 211 to be sleeved in the lower cylinder 221 to achieve the sleeved and fixed connection between the upper bushing 210 and the lower bushing 220, but also enables the limit block 214 to be plugged into the limit groove 224 to prevent relative rotation or up and down movement between the upper bushing 210 and the lower bushing 220, thereby enhancing the safety performance of the battery pack.

[0054] like Fig. 9 , Fig.14 and Fig.15 As shown, the limiting groove 224 is constructed as a groove with an open top and passing through the wall of the second through hole 223, so that the limiting block 214 can be inserted into the limiting groove 224 from top to bottom and have an interference fit with it, thereby realizing the sleeve fit and limiting fixation of the upper bushing 210 and the lower bushing 220.

[0055] like Figures 9 to 12 and Fig.14 , Fig.15As shown, a plurality of limit blocks 214 are arranged at intervals along the circumference of the upper cylinder 211, and a plurality of limit grooves 224 are arranged at intervals along the circumference of the lower cylinder 221, so that the limit blocks 214 can be inserted into the corresponding limit grooves 224. By providing a plurality of limit blocks 214 and limit grooves 224 that are inserted and matched with the limit blocks 214, the limit effect is further enhanced, thereby further improving the anti-rotation and anti-sequential movement effects.

[0056] like Fig.14 and Fig.15 As shown, the limiting groove 224 includes a first groove 2241 and a second groove 2242 arranged below the first groove 2241 and connected to the first groove 2241, that is, the limiting groove 224 is an L-shaped groove, the circumferential dimension of the second groove 2242 is larger than the circumferential dimension of the first groove 2241, and the limiting block 214 is an L-shaped protrusion, which is inserted into the first groove 2241, wherein the long arm 2141 of the L-shaped protrusion is located in the first groove 2241, and the short arm 2142 of the L-shaped protrusion is at least partially inserted into the second groove 2242, and the L-shaped protrusion is limited by the second groove 2242 so that the short arm 2142 of the L-shaped protrusion can move in the second groove 2242, thereby limiting the L-shaped protrusion from rotating relative to the lower cylinder 221 or moving up and down, thereby limiting the relative rotation or moving up and down between the upper bushing 210 and the lower bushing 220.

[0057] Exemplarily, when the upper bushing 210 is configured to rotate along the first circumferential direction, the short arm 2142 of the L-shaped protrusion can be inserted into the second groove 2242, and when it is rotated to the first preset position, it is limitedly engaged with the second groove 2242 to achieve a locking fit between the upper bushing 210 and the lower bushing 220; when the upper bushing 210 is configured to rotate along the second circumferential direction, the short arm 2142 of the L-shaped protrusion is separated from the second groove 2242 when it is rotated to the second preset position, to achieve an unlocking and separation between the upper bushing 210 and the lower bushing 220, wherein the first circumferential direction and the second circumferential direction are in opposite directions to each other.

[0058] Preferably, the circumferential dimension of the first groove 2241 is greater than the maximum circumferential dimension of the limiting block 214 , so that the limiting block 214 and the first groove 2241 are loosely matched, which is conducive to the rapid insertion of the limiting block 214 into the first groove 2241 .

[0059] like Figure 5 and Figure 6 As shown, a first annular vibration-damping groove 215 is provided on the upper portion of the outer wall of the upper cylinder 211. When the battery pack is subjected to a vibration test or an impact test, the first vibration-damping groove 215 can absorb and reduce the lateral vibration of the battery pack, effectively absorb and reduce the vibration of the battery pack itself and the vibration energy transmitted to the outside, and improve the structural strength of the upper bushing 210 to prevent the upper bushing 210 from being broken due to vibration or impact.

[0060] Preferably, a first annular vibration-damping pad is embedded in the first vibration-damping groove 215 , and the first annular vibration-damping pad has both high vibration-damping performance and high vibration-isolating performance, thereby further improving the structural strength of the upper bushing 210 .

[0061] like Figure 2 , Figure 4 , Figure 7 and Figure 8 As shown, a second annular vibration-damping groove 225 is provided at the lower portion of the outer peripheral wall of the lower cylinder 221. When the battery pack is subjected to a vibration test or an impact test, the second vibration-damping groove 225 can absorb and reduce the lateral vibration of the battery pack, effectively absorb and reduce the vibration of the battery pack itself and the vibration energy transmitted to the outside, and improve the structural strength of the lower bushing 220 to prevent the lower bushing 220 from being broken due to vibration or impact.

[0062] Preferably, a second annular vibration-damping pad is embedded in the second vibration-damping groove 225 , and the second annular vibration-damping pad has both high vibration-damping performance and high vibration-isolating performance, thereby further improving the structural strength of the lower bushing 220 .

[0063] Exemplarily, the minimum diameter of the first damping groove is recorded as D5, and the minimum diameter of the second damping groove is recorded as D6, wherein D5=D2-2, D6=D3-2. By providing the first damping groove 215 and the second damping groove 225, the larger stress generated during the vibration test or other tests can be absorbed, and the strength of the bushing structure 200 can be ensured, thereby improving the structural strength of the battery pack.

[0064] A battery pack is also provided in an embodiment of the present application, which includes the bushing structure 200 in the above embodiment, and also includes all the advantages of the bushing structure 200, which will not be described in detail here.

[0065] like Figure 1 As shown, the battery pack includes a first connecting plate 111 and a second connecting plate 112 which are spaced apart along the axial direction of the fastener. The first connecting plate 111 and the second connecting plate 112 are respectively provided with mounting holes for the bushing structure 200 to pass through. The fastener passes through the second penetration hole 223 and the first penetration hole 213 in sequence from bottom to top, thereby forming a battery pack assembly and fixedly connected to the vehicle body mounting beam.

[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A bushing structure, used for fixing a mounting bracket connected to a battery pack housing for fasteners to pass through, characterized in that: The bushing structure comprises: An upper bushing, comprising an upper cylinder through which the mounting bracket is inserted and an upper stop portion radially protruding from the upper cylinder, wherein a first through hole is formed in the interior of the upper cylinder and passes through along the axial direction thereof, and a lower surface of the upper stop portion abuts against an upper surface of the mounting bracket; The lower bushing includes a lower cylinder that passes through the mounting bracket and is sleeved with the upper cylinder, and a lower stop portion that radially protrudes from the lower cylinder, the upper surface of the lower stop portion abuts against the lower surface of the mounting bracket, and a second penetration hole that penetrates along its axial direction is formed inside the lower cylinder so that the fastener can pass through the second penetration hole and the first penetration hole in sequence.

2. The bushing structure according to claim 1, characterized in that: The upper cylinder passes through the second penetration hole from top to bottom and is sleeved with the lower cylinder, and the upper cylinder and the second penetration hole are interference fit.

3. The bushing structure according to claim 2, characterized in that: The second through hole is a stepped hole, which includes a stepped large hole located at the upper part of the lower cylinder and a stepped small hole located at the lower part of the lower cylinder. The upper cylinder passes through the stepped large hole from top to bottom and is sleeved with the lower cylinder. The upper cylinder and the stepped large hole are interference fit.

4. The bushing structure according to claim 3, characterized in that: The first one of the upper cylinder and the lower cylinder is provided with a limiting block radially protruding from the first one, and the second one of the upper cylinder and the lower cylinder is provided with a limiting groove for inserting the limiting block.

5. The bushing structure according to claim 4, characterized in that: The outer peripheral wall of the upper cylinder is provided with a limit block extending radially outward, and the lower cylinder is provided with a limit groove penetrating through the wall of the second through hole for accommodating the limit block.

6. The bushing structure according to claim 5, characterized in that: The limiting groove is constructed as a groove with an open top and penetrating through the wall of the second through hole, so that the limiting block can be inserted into the limiting groove from top to bottom and have an interference fit therewith.

7. The bushing structure according to claim 6, characterized in that: A plurality of the limit blocks are arranged at intervals along the circumference of the upper cylinder, and a plurality of the limit grooves are arranged at intervals along the circumference of the lower cylinder, so that the limit blocks can be inserted into the corresponding limit grooves.

8. The bushing structure according to claim 6, characterized in that: The limiting groove includes a first groove and a second groove arranged below the first groove and connected to the first groove; The limiting block is an L-shaped protrusion, the L-shaped protrusion is inserted into the first groove, and the short arm of the L-shaped protrusion is at least partially inserted into the second groove.

9. The bushing structure according to any one of claims 1 to 8, characterized in that: The upper portion of the outer peripheral wall of the upper cylinder is provided with an annular first vibration-damping groove; and / or A second annular vibration-damping groove is arranged at the lower portion of the outer peripheral wall of the lower cylinder.

10. A battery pack, characterized in that: The invention comprises the bushing structure as claimed in any one of claims 1 to 9.

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