Search

CN-116241542-B - Bolt assembly, fixing mechanism, battery system and automobile

CN116241542BCN 116241542 BCN116241542 BCN 116241542BCN-116241542-B

Abstract

The application relates to a bolt assembly, a fixing mechanism, a battery system and an automobile, and belongs to the technical field of new energy automobiles. The bolt assembly comprises a shell, a bolt, a compression spring, a clamping ring, a first cover plate, a first sealing ring and a second sealing ring, wherein a first external spline is arranged on the outer wall of a part of the non-threaded section, a first internal spline and a second external spline are respectively arranged on the inner wall and the outer wall of the clamping ring, a second internal spline is arranged on the inner wall of a first through hole of the first cover plate, the first sealing ring is positioned between the first cover plate and the shell, and the second sealing ring is positioned between the first cover plate and the non-threaded section. By adopting the application, the tightness of the bolt component can be improved, and the phenomenon of sliding wires of the bolt during installation can be avoided, thereby prolonging the service life of the bolt component.

Inventors

  • ZHU JIANFENG
  • SONG KAITONG
  • XIE KUN
  • WANG YADONG
  • HE CHANGJIAO
  • ZHAO YAN

Assignees

  • 奇瑞新能源汽车股份有限公司

Dates

Publication Date
20260505
Application Date
20230302

Claims (12)

  1. 1. A bolt assembly (2) is characterized in that the bolt assembly (2) comprises a shell (21), a bolt (22), a compression spring (23), a clamping ring (24), a first cover plate (25), a first sealing ring (26) and a second sealing ring (27); the shell (21) is used for being fixedly connected with the battery pack frame (002), the shell (21) is provided with a cylindrical structure with two open ends, and a cylindrical cavity (21 a) is arranged in the cylindrical structure; The bolt (22) comprises a threaded section (221), a flange part (222) and a non-threaded section (223) which are sequentially connected, wherein the threaded section (221) is used for being in threaded connection with a floating nut component (1), the diameter of the threaded section (221) is smaller than or equal to the inner diameter of a first opening (21 b) of the shell (21), the first opening (21 b) is an opening of the shell (21) close to the threaded section (221), the diameter of the flange part (222) is larger than the inner diameter of the first opening (21 b), the outer wall of the flange part (222) is attached to the inner wall of the cylindrical cavity (21 a), the flange part (222) can slide in the cylindrical cavity (21 a), when the flange part (222) is located at a limit position close to the first opening (21 b), a part of the threaded section (221) is located outside the first opening (21 b), the non-threaded section (223) is located in the cylindrical cavity (21 a), and the outer wall of the non-threaded section (223) is provided with a spline part (223); The compression spring (23) is connected with the wall surface of the flange part (222) which is far away from the thread section (221); The inner wall of the clamping ring (24) is provided with a first internal spline (24 b), the first internal spline (24 b) is matched with the first external spline (223 a), the outer wall of the clamping ring (24) is provided with a second external spline (24 a), the outer diameter of the clamping ring (24) is larger than the outer diameter of the compression spring (23), and the clamping ring (24) can slide on the part with the first external spline (223 a) on the outer wall of the non-threaded section (223); The first cover plate (25) is located in a second opening (21 c) of the shell (21) and is connected with the shell (21), the second opening (21 c) is an opening in the shell (21) close to the unthreaded section (223), the first cover plate (25) is provided with a first through hole (25 e) penetrating through a first surface (25 m) and a second surface (25 n), the first surface (25 m) is a surface in the first cover plate (25) close to the first opening (21 b), the second surface (25 n) is a surface opposite to the first surface (25 m), the inner diameter of the first through hole (25 e) is larger than the diameter of the unthreaded section (223), the inner wall of the first through hole (25 e) is provided with a second inner spline (25 b), and the second inner spline (25 b) is matched with the second outer spline (24 a); The first sealing ring (26) is positioned between the first cover plate (25) and the shell (21) and is connected with the first cover plate (25); the second sealing ring (27) is located between the first through hole (25 e) and the non-threaded section (223) and is connected with the inner wall of the first through hole (25 e).
  2. 2. Bolt assembly (2) according to claim 1, wherein the external thread of the outer wall of the thread section (221) is a fine-pitch thread.
  3. 3. The bolt assembly (2) of claim 1, wherein the first through hole (25 e) comprises a first hole section (251 e) and a second hole section (252 e); -the first hole section (251 e) is located on the side of the second hole section (252 e) close to the first surface (25 m), the inner wall of the first hole section (251 e) is provided with a second internal spline (25 b), and in case that the flange part (222) is located at the extreme position close to the first opening (21 b), the end of the first hole section (251 e) away from the first opening (21 b) is flush with the end of the first external spline (223 a) away from the first opening (21 b); The inner wall of the second hole section (252 e) is a smooth wall surface, and the second sealing ring (27) is located between the second hole section (252 e) and the non-threaded section (223) and is connected with the inner wall of the second hole section (252 e).
  4. 4. The bolt assembly (2) according to claim 1, wherein the diameter of the threaded section (221) is the same as the diameter of the non-threaded section (223).
  5. 5. Bolt assembly (2) according to any of claims 1 to 4, wherein the first sealing ring (26) and the second sealing ring (27) are both made of polytetrafluoroethylene.
  6. 6. A fixing mechanism, characterized in that it comprises a floating nut assembly (1) and a bolt assembly (2) according to any one of claims 1-5.
  7. 7. The fixation mechanism according to claim 6, wherein the floating nut assembly (1) comprises a dust cap (11), a floating nut (12) and a third sealing ring (13); The dustproof cover (11) is used for being connected with a vehicle body beam (001), a first cavity (11 a) and a second cavity (11 b) are formed in the dustproof cover (11), and the first cavity (11 a) is communicated with the second cavity (11 b); The floating nut (12) comprises a nut body (121) and a limiting protrusion (122), the nut body (121) is provided with a cylindrical structure, a threaded through hole (121 a) is formed in the axis direction of the cylindrical structure, the threaded through hole (121 a) is used for being in threaded connection with a threaded section (221) of a bolt (22) in a bolt assembly (2), one part of the nut body (121) is located in the first cavity (11 a), the other part of the nut body is located in the second cavity (11 b), the limiting protrusion (122) is located on the outer wall of the nut body (121) and is connected with the nut body (121), the limiting protrusion (122) is located in the first cavity (11 a), and the limiting protrusion (122) can move in the first cavity (11 a) along the axis direction of the cylindrical structure; The third sealing ring (13) is located between the dust cover (11) and the vehicle body beam (001) and is connected with the dust cover (11).
  8. 8. The securing mechanism according to claim 7, characterized in that the second cavity (11 b) is located at a side of the first cavity (11 a) remote from the bolt assembly (2).
  9. 9. The fastening mechanism according to claim 8, wherein, in the case where the limit projection (122) is located at a limit position away from the second cavity (11 b), a distance from a wall surface of the limit projection (122) near the second cavity (11 b) to the second cavity (11 b) is located within a first numerical range, the first numerical range being a double thread pitch to a triple thread pitch.
  10. 10. The fixing mechanism according to claim 7, wherein the internal thread of the inner wall of the threaded through hole (121 a) is a fine thread.
  11. 11. A battery system comprising a securing mechanism according to any one of claims 6-10.
  12. 12. An automobile is characterized in that, the automobile comprising the battery system according to claim 11.

Description

Bolt assembly, fixing mechanism, battery system and automobile Technical Field The application relates to the technical field of new energy automobiles, in particular to a bolt assembly, a fixing mechanism, a battery system and an automobile. Background For new energy automobiles, two energy supplementing modes, namely a charging mode and a power conversion mode, are currently included. Compared with a charging mode, the power conversion mode has the advantages of rapid energy compensation, low battery loss and the like. In the battery change mode, the vehicle is parked in the battery change station for battery change. The fixing mechanism of the new energy automobile comprises a bolt component and a nut component. The servo gun can complete replacement of the battery pack by disassembling and assembling the bolts in the bolt assembly. Currently, bolt assemblies have poor sealing performance, and at the same time, the servo gun typically directly screws the bolts during the process of mounting the battery pack to the vehicle body. However, the bolt assembly has poor sealing performance, and impurities such as dust, metal chips and the like are liable to enter the bolt assembly. When the battery pack is installed, the servo gun directly screws the bolt, and when the servo gun screws, the axis around the servo gun and the axis of the threaded hole possibly have coaxiality deviation, so that sliding wires are generated, and the service life of the bolt assembly can be reduced. Disclosure of Invention The embodiment of the application provides a bolt assembly, a fixing mechanism, a battery system and an automobile, which can solve the technical problems in the related art, and the technical scheme is as follows: in a first aspect, an embodiment of the present application provides a bolt assembly, where the bolt assembly includes a housing, a bolt, a compression spring, a clamping ring, a first cover plate, a first seal ring, and a second seal ring; the shell is used for being fixedly connected with the battery pack frame, the shell is provided with a cylindrical structure with two ends open, and a cylindrical cavity is formed in the cylindrical structure; The bolt comprises a threaded section, a flange part and a non-threaded section which are sequentially connected, wherein the threaded section is used for being in threaded connection with a floating nut component, the diameter of the threaded section is smaller than or equal to the inner diameter of a first opening of the shell, the first opening is an opening of the shell close to the threaded section, the diameter of the flange part is larger than the inner diameter of the first opening, the outer wall of the flange part is attached to the inner wall of the cylindrical cavity, the flange part can slide in the cylindrical cavity, a part of the threaded section is located outside the first opening under the condition that the flange part is located at the limit position close to the first opening, and the non-threaded section is located in the cylindrical cavity and is provided with a first external spline; the compression spring is connected with the wall surface of the flange part, which is far away from the thread section; The inner wall of the clamping ring is provided with a first internal spline which is matched with the first external spline, the outer wall of the clamping ring is provided with a second external spline, the outer diameter of the clamping ring is larger than that of the compression spring, and the clamping ring can slide on the part, provided with the first external spline, of the outer wall of the non-threaded section; The first cover plate is positioned in a second opening of the shell and is connected with the shell, the second opening is an opening, close to the non-threaded section, in the shell, the first cover plate is provided with a first through hole penetrating through a first surface and a second surface, the first surface is a surface, close to the first opening, in the first cover plate, the second surface is a surface opposite to the first surface, the inner diameter of the first through hole is larger than the diameter of the non-threaded section, the inner wall of the first through hole is provided with a second internal spline, and the second internal spline is matched with the second external spline; The first sealing ring is positioned between the first cover plate and the shell and is connected with the first cover plate; The second sealing ring is located between the first through hole and the non-threaded section and is connected with the inner wall of the first through hole. In one possible implementation, the external thread of the outer wall of the thread segment is a fine thread. In one possible implementation, the first through hole includes a first hole section and a second hole section; The first hole section is located on one side of the first surface of the second hole Duan Kaojin, and the inner wall of t