Top cover assembly

Abstract

The utility model provides a top cover assembly, which is used for connecting a tab in a battery cell and comprises a top cover, a welding piece, a pole and an upper plastic piece, the welding piece comprises a bearing part, a first limiting section and a second limiting section, and the pole comprises a main body and a lug boss; the upper plastic part comprises a first section, a second section, a third section and a fourth section which are sequentially connected. According to the utility model, the upper plastic part is provided with the first section, the second section, the third section and the fourth section which are connected in sequence, and the first section and the third section are clamped between the first limiting sections in the welding part, so that the upper plastic part and the welding part are relatively fixed, and the third section and the bearing part in the welding part are used for clamping the lug boss in the pole; relative fixation between the pole and the upper plastic part as well as between the pole and the welding part is realized, so that the stability of connection of all parts between the top cover assembly is ensured, and the safety of a battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a top cap subassembly. BACKGROUND

[0002] Secondary battery is mainly applied to energy storage battery and power battery in new energy industry, and with the development of new energy industry, the requirement of battery is also continuously improved, and the safety performance and sealing performance of battery top cap as the core part of battery are paid more and more attention.

[0003] In the top cap assembling process, the assembling of battery top cap can be made by injection molding process, and the insulation and relative fixation between the welding ring and the pole are realized by the plastic part formed by injection molding. However, in the top cap subassembly provided by the related art, the connection between the parts is not tight enough, and is prone to looseness or even fall off, which affects the normal use of the battery cell and exists a great safety hazard. SUMMARY

[0004] The embodiment of the utility model provides a top cap subassembly, which can improve the technical problem of loose connection between the top cap subassemblies in the related art.

[0005] In a first aspect, the embodiment of the utility model provides a top cap subassembly for connecting the tab in the battery cell, which comprises:

[0006] A top cap, wherein a first through hole is arranged on the top cap;

[0007] A welding piece, at least part of the welding piece is arranged in the first through hole, the welding piece comprises a bearing part, a first limiting section and a second limiting section, along the axial direction of the first through hole, the first limiting section and the bearing part are arranged at both ends of the second limiting section and extend towards the first through hole;

[0008] A pole, the pole is arranged in a spaced manner with the welding piece, the pole comprises a main body and a protruding part, and the protruding part is protruded on the circumferential surface of the main body;

[0009] An upper plastic part, the upper plastic part comprises a first section, a second section, a third section and a fourth section connected in sequence, the second section is clamped between the first limiting section and the main body, the first section and the third section extend in the axial direction of the first through hole and are connected with both ends of the second section respectively and extend in the direction away from the pole, the first limiting section is at least partially clamped between the first section and the third section, and the fourth section is clamped between the second limiting section and the protruding part.

[0010] In an embodiment, the upper plastic part further comprises a fifth section, the fifth section is connected with one end of the fourth section away from the third section, and the fifth section is clamped between the protruding part and the bearing part.

[0011] In an embodiment, the top cover assembly further comprises a sealing member, at least part of the sealing member is connected with the upper surface of the bearing part, so that the sealing member can be mounted on the bearing part, and the pole column is connected with the sealing member.

[0012] In an embodiment, the bearing part is provided with a second through hole, and the sealing member comprises:

[0013] a mounting section clamped between the pole column and the bearing part;

[0014] a connecting section connected to one end of the mounting section close to the second through hole and extending along the axial direction of the second through hole towards the second through hole, and abutting against the side wall of the second through hole.

[0015] In an embodiment, the welding member further comprises a third limiting section, the third limiting section is arranged on the side of the second limiting section away from the bearing part, and one end of the third limiting section away from the second limiting section is connected with the top cover.

[0016] In an embodiment, the second limiting section comprises a first surface away from the pole column, the third limiting section is connected with the side wall of the first through hole, and the first surface is arranged spaced apart from the side wall of the first through hole.

[0017] The upper plastic member further comprises a sixth section connected to one end of the first section away from the second section, the sixth section extends along the first surface, so that the sixth section is clamped at least partially between the side wall of the first through hole and the first surface.

[0018] In an embodiment, the top cover is provided with a connecting groove, the opening of the connecting groove faces the side wall of the first through hole, and part of the third limiting section is accommodated in the connecting groove.

[0019] In an embodiment, along the axial direction of the first through hole, the ratio of the size of the third limiting section to the size of the top cover is between 0.2 and 0.5.

[0020] In an embodiment, the first limiting section and the second limiting section are both at least two, and at least two second limiting sections are arranged oppositely, so that the bearing part, the first limiting section and the second limiting section form an opening, and the pole column can be inserted between the second limiting sections from the opening.

[0021] In an embodiment, the upper surface of the pole column is provided with a positioning hole, and the positioning hole is strip-shaped.

[0022] The embodiment of the utility model has the advantages of:

[0023] The utility model discloses a top cover assembly, which comprises a top cover, a welding piece and an upper plastic piece, wherein the upper plastic piece is provided with a first section, a second section, a third section and a fourth section which are connected in sequence, the first section and the third section are provided with a first limiting section, the third section and the welding piece are provided with a bearing part, and the bearing part is provided with a protruding part. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by the drawings according to the drawings without the creative labor for the person skilled in the art.

[0025] Figure 1 It is the structural schematic diagram of top cover assembly provided by the embodiment of the utility model;

[0026] Figure 2 It is the explosion view of top cover assembly provided by the embodiment of the utility model;

[0027] Figure 3 It is the sectional view of top cover assembly provided by the embodiment of the utility model;

[0028] Figure 4 It is Figure 3 The enlarged view of A in Fig.

[0029] Figure 5 It is the structural schematic diagram of welding piece provided by the embodiment of the utility model;

[0030] Figure 6 It is the sectional view of welding piece provided by the embodiment of the utility model;

[0031] Figure 7 It is the structural schematic diagram of top cover provided by the embodiment of the utility model.

[0032] The respective reference numerals in the drawings are as follows:

[0033] 1, top cover assembly;

[0034] 11, top cover; 111, first through hole; 112, connecting groove; 1121, notch;

[0035] 12, welding piece; 121, bearing part; 122, first limiting section; 123, second limiting section; 1231, first surface; 124, third limiting section; 125, opening;

[0036] 13, pole; 131, main body; 132, protruding part; 133, positioning hole;

[0037] 14, upper plastic part; 141, first section; 142, second section; 143, third section; 144, fourth section; 145, fifth section; 146, sixth section;

[0038] 15, sealing part; 151, mounting section; 152, connecting section;

[0039] H1, radial direction of the first through hole;

[0040] H2, axial direction of the first through hole. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as 'up' and 'down' are generally used for indicating the up and down in the actual use or working state of the device, and the specific is the drawing direction in the drawings; and 'inner' and 'outer' are used for the contour of the device.

[0042] The power battery generally comprises a battery cell, a battery shell accommodating the battery cell, a battery top cover sealedly mounted on the battery shell, and an electrolyte filled in the battery shell. When the battery shell is closed by the battery top cover, the positive and negative pole lugs of the battery cell need to be connected with the bottom end of the pole inserted into the inside of the top cover, so that after the battery shell is closed by the battery top cover, the top end of the pole exposed outside is connected with the external circuit, and the positive and negative poles of the battery cell are led out. However, the inventor of the utility model finds that in the use process of the power battery provided in the related art, the connection between the various components in the top cover assembly is relatively loose, so that when the collision, falling and other situations occur, part of the parts are prone to displacement or even falling off, resulting in the occurrence of open circuit or short circuit.

[0043] Therefore, with reference to the drawings Figures 1 to 5The utility model discloses first aspect provides a kind of top cover assembly 1, for connecting electric core, top cover assembly 1 includes top cover 11, welding piece 12, pole 13 and upper plastic piece 14, top cover 11 is provided with first through-hole 111;Welding piece 12, at least part of welding piece 12 is arranged in first through-hole 111, welding piece 12 includes bearing portion 121, first limiting section 122 and second limiting section 123, along the axial direction H2 of first through-hole, first limiting section 122 and bearing portion 121 are arranged at the both ends of second limiting section 123 and extend towards first through-hole 111;Pole 13, pole 13 is spaced apart from welding piece 12, pole 13 includes main body 131 and protruding portion 132, and protruding portion 132 is protruded on the circumferential surface of main body 131;Upper plastic piece 14, upper plastic piece 14 includes first section 141, second section 142, third section 143 and fourth section 144 connected in sequence, second section 142 is clamped between first limiting section 122 and main body 131, first section 141 and third section 143 extend respectively at the both ends of second section 142 along the axial direction H2 of first through-hole and extend in the direction away from pole 13, first limiting section 122 is at least partially clamped between first section 141 and third section 143, and fourth section 144 is clamped between second limiting section 123 and protruding portion 132.

[0044] Welding piece 12 is fixed on top cover 11. Upper plastic piece 14 includes first section 141, second section 142, third section 143 and fourth section 144 connected in sequence, and first section 141 and third section 143 extend in the direction away from pole 13, so that the first limiting section 122 of welding piece 12 is clamped in the middle, so that the position of upper plastic piece 14 on the axial direction H2 of first through-hole is fixed by welding piece 12;The main body 131 of pole 13 and the first limiting section 122 of welding piece 12 clamp second section 142 in the middle, and the protruding portion 132 of pole 13 and the second limiting section 123 clamp fourth section 144 in the middle, so that the position of upper plastic piece 14 on the radial direction H1 of first through-hole is fixed by welding piece 12, so that upper plastic piece 14 is fixed on welding piece 12. At the same time, the protruding portion 132 of pole 13 is clamped in the middle by third section 143 and the bearing portion 121 of welding piece 12, so that the position of pole 13 on the axial direction H2 of first through-hole is fixed, and then the pole 13 is fixed on the welding piece 12, that is, the welding piece 12, the upper plastic piece 14 and the pole 13 are stably connected with the top cover 11, so that when the electric core vibrates in the production and use process, the components in the top cover assembly 1 are still stably connected together, so as to improve the connection reliability between the components in the top cover assembly 1.

[0045] The second section 142 also functions to isolate the pole column 13 and the first limiting section 122, preventing direct contact between the pole column 13 and the first limiting section 122 and avoiding possible short circuiting. Moreover, the second section 142 can function to some extent as a buffer, preventing damage caused by mutual friction or collision between the components in the top cover assembly 1 when the top cover assembly 1 is subjected to external vibration or impact. The third section 143 and the fourth section 144 further extend into the gap between the pole column 13 and the welding member 12, reducing the possibility of impurities such as dust and moisture in the external environment entering the interior of the battery cell through the gap, effectively extending the service life of the battery cell and improving the safety and performance stability of the battery.

[0046] The first through hole 111 is arranged in correspondence with the pole column 13, so that the pole column 13 can connect the connecting tab, the tab, and other structures inside the battery cell through the first through hole 111, realizing the conduction of the circuit. The welding member 12 includes the first limiting section 122, the second limiting section 123, and the bearing portion 121, which are connected to each other. The bearing portion 121 can be connected to the top cover 11 by welding, bonding, clamping, or the like, and can be connected to the outer surface of the top cover 11. The bearing portion 121 can also be connected to the inner wall of the first through hole 111, which is not limited in the embodiments of the present application. The first limiting section 122 and the second limiting section 123 can be made by integral molding, or the first limiting section 122 and the second limiting section 123 can be made separately and then connected to form the welding member 12 by subsequent welding, bonding, or the like. The second limiting section 123 is usually connected by welding, bonding, or clamping. The first limiting section 122 and the bearing portion 121 extend toward the first through hole 111, i.e., toward the interior of the welding member 12, so that the first limiting section 122, the second limiting section 123, and the bearing portion 121 enclose a groove, and the groove has an opening 125 toward the interior of the welding member 12.

[0047] The pole column 13 is made of a metal material, usually a material with good electrical conductivity such as copper, aluminum, nickel, or the like. The pole column 13 includes the main body 131 and the protruding portion 132, and is arranged spaced apart from the welding member 12, so that a zigzag gap is formed between the pole column 13 and the welding member 12, facilitating the formation of the upper plastic member 14 in the subsequent injection molding process.

[0048] The utility model discloses a top cover assembly 1, including upper plastic piece 14, welding piece 12, pole 13 and sealing piece 15, upper plastic piece 14 is connected with welding piece 12, pole 13 is connected with welding piece 12, and sealing piece 15 is connected with pole 13.

[0049] In an embodiment, referring to Figure 4 Upper plastic piece 14 further includes fifth section 145, and fifth section 145 is connected with the end of fourth section 144 away from third section 143, and fifth section 145 is clamped between protruding part 132 and bearing part 121.

[0050] The protruding part 132 of pole 13 and the bearing part 121 of welding piece 12 clamp fifth section 145 in the middle, so that the position of upper plastic piece 14 on the radial direction H1 of first through hole is further fixed, thereby further improving the stability of the connection between upper plastic piece 14 and other components. And fifth section 145 is made of insulating material, so that the insulation between pole 13 and welding piece 12 can be realized without setting additional insulating coating or other insulating structure, which simplifies the manufacturing steps of top cover assembly 1. The length of fifth section 145 can be set as required, for example, fifth section 145 can extend along bearing part 121 to the edge of first through hole 111.

[0051] It can be understood that, in order to form fifth section 145 of upper plastic piece 14 during injection molding, the mold used during injection molding can be adjusted, and the part of the mold used to support pole 13 is set to be higher than the part used to support welding piece 12, so that a certain gap is left between pole 13 and welding piece 12, facilitating the flow of fluid material used for injection molding.

[0052] In an embodiment, referring to Figures 2 to 4 Top cover assembly 1 further includes sealing piece 15, and at least part of sealing piece 15 is connected with the upper surface of bearing part 121, so that sealing piece 15 can be installed on bearing part 121, and pole 13 is connected with sealing piece 15.

[0053] For example, to enable the sealing member 15 to be directly mounted on the bearing portion 121, the bottom of the sealing member 15 can be configured as a flat surface, so that the sealing member 15 can be directly mounted on the upper surface of the bearing portion 121; or a groove can be provided on the sealing member 15, and a corresponding protrusion can be provided on the bearing portion 121, so that the sealing member 15 and the bearing portion 121 can be clamped with each other. The embodiments of the utility model do not limit this. After the sealing member 15 is mounted, the pole column 13 can be directly placed on the sealing member 15. When the injection molding process is subsequently performed, the fluid material can flow into the gap between the pole column 13 and the welding member 12 and solidify into the upper plastic member 14.

[0054] In the embodiments of the utility model, the sealing member 15 can be directly mounted on the bearing portion 121, so that the pole column 13, the sealing member 15 and the welding ring can be combined together first, and then locked by the injection molding mode to form a connection terminal, thereby facilitating the subsequent connection of the welding member 12 in the connection terminal and the top cover 11, simplifying the operation steps during the connection and reducing the difficulty of the connection.

[0055] In an embodiment, referring to Figure 4 , the bearing portion 121 is provided with a second through hole, and the sealing member 15 comprises:

[0056] an installation section 151 clamped between the pole column 13 and the bearing portion 121;

[0057] a connecting section 152 connected to one end of the installation section 151 close to the second through hole and extending along the axial direction of the second through hole towards the second through hole, and abutting against the side wall of the second through hole.

[0058] The installation section 151 of the sealing member 15 is clamped between the pole column 13 and the bearing portion 121, and the connecting section 152 is in contact with the side wall of the second through hole. Through the cooperation between the installation section 151 and the connecting section 152, the positioning and alignment of the sealing member 15 during assembly are facilitated, the human error is reduced, the assembly process is simplified, and the production efficiency of the top cover assembly 1 is improved. The installation section 151 is clamped between the pole column 13 and the bearing portion 121, thereby providing mechanical support for the pole column 13, and enabling the gap between the bottom of the pole column 13 and the bearing portion 121 to be formed without the aid of a mold. The design of the connecting section 152 further limits the position and deformation of the sealing member 15, thereby improving the anti-vibration and anti-impact capability of the sealing member 15 during use of the battery cell, and enhancing the overall stability of the top cover assembly 1.

[0059] In an embodiment, referring to Figure 5 and Figure 6 , the welding member 12 further comprises a third limiting section 124 provided on the side of the second limiting section 123 away from the bearing portion 121, and one end of the third limiting section 124 away from the second limiting section 123 is connected to the top cover 11.

[0060] The third limiting section 124 can be welded or bonded with the top cover 11, or can be clamped with the top cover 11 by setting a buckle on the top cover 11 and a clamping groove on the third limiting section 124. By setting a third limiting section 124, the third limiting section 124 and the second limiting section 123 can be used as positioning reference of the welding piece 12. By controlling the distance between the second limiting section 123 and the top cover 11 while controlling the abutment of the third limiting section 124 and the top cover 11, the third limiting section 124 and the top cover 11 can be accurately connected, thereby simplifying the assembly process between the welding piece 12 and the top cover 11 and improving the production efficiency.

[0061] In an embodiment, referring to Figure 5 The second limiting section 123 includes a first surface 1231 facing away from the pole 13, and the third limiting section 124 is connected with the side wall of the first through hole 111, and the first surface 1231 is arranged spaced apart from the side wall of the first through hole 111.

[0062] The upper plastic piece 14 further includes a sixth section 146 connected with one end of the first section 141 away from the second section 142, and the sixth section 146 extends along the first surface 1231 so as to be at least partially clamped between the side wall of the first through hole 111 and the first surface 1231.

[0063] Since the third limiting section 124 is arranged protruding from the first surface 1231, by controlling the connection of the third limiting section 124 on the side wall of the first through hole 111, a gap is left between the first surface 1231 and the side wall of the first through hole 111. Therefore, during the injection molding process, the fluid material can extend along the first surface 1231 of the second limiting section 123 to form a sixth section 146 clamped between the side wall of the first through hole 111 and the first surface 1231. At this time, the sixth section 146 and the fourth section 144 jointly clamp the second limiting section 123 of the welding piece 12, which increases the fixing effect of the upper plastic piece 14 on the welding piece 12 and reduces the probability of displacement, loosening or structural failure caused by vibration or impact, thereby improving the overall stability and tightness of the assembly.

[0064] Since the sixth section 146 is formed by filling the gap between the first surface 1231 and the side wall of the first through hole 111 with fluid material, the sixth section 146 ensures that there is no gap between the side wall of the first through hole 111 and the second limiting section 123, which can effectively prevent external gas or liquid from penetrating into the inside of the top cover assembly 1 and causing corrosion, thereby improving the sealing performance and safety performance of the top cover assembly 1. When subjected to vibration or impact, the tightly connected top cover assembly 1 is more conducive to stress dispersion, which is particularly important in application scenarios of battery cells that require high safety and stability.

[0065] In an embodiment, referring toFigure 7 The top cover 11 is provided with a connecting groove 112, and the groove opening 1121 of the connecting groove 112 faces the side wall of the first through hole 111. Part of the third limiting segment 124 is accommodated in the connecting groove 112.

[0066] By accommodating part of the third limiting segment 124 in the connecting groove 112, an embedded connection structure of the limiting segment and the top cover 11 is formed, which significantly improves the stability of the connection between the third limiting segment 124 and the top cover 11, thereby enhancing the stability of the entire assembly under mechanical vibration, thermal expansion and contraction, or external force impact, and avoiding the loosening or deviation of the welding piece 12. Moreover, the provision of the connecting groove 112 provides a clear installation position for the third limiting segment 124, so that the limiting segment can be more easily installed on the top cover 11 during assembly, reducing the assembly difficulty of the top cover assembly 1 and reducing the performance degradation of the top cover assembly 1 caused by assembly errors.

[0067] In some embodiments, the connecting groove 112 is located in the middle of the top cover 11, i.e., the groove opening 1121 of the connecting groove 112 is arranged in the middle of the side wall of the first through hole 111, so that the bottom surface of the welding piece 12 is at a higher position compared to the bottom surface of the top cover 11, thereby avoiding the welding piece 12 from affecting the structures such as the pole piece and the tab inside the battery cell.

[0068] In some embodiments, the connecting groove 112 is located at the bottom of the top cover 11, and at this time the connecting groove 112 has a groove opening 1121 facing the bottom surface of the top cover 11, so that when the welding piece 12 is installed, the third limiting segment 124 can be installed in the connecting groove 112 by moving from bottom to top, thereby reducing the assembly difficulty of the top cover assembly 1.

[0069] In an embodiment, along the axial direction H2 of the first through hole, the ratio of the size of the third limiting segment 124 to the size of the top cover 11 is between 0.2 and 0.5.

[0070] If the ratio of the size of the third limiting section 124 to the size of the top cover 11 is less than 0.2, the thickness of the third limiting section 124 is too small, the structural strength of the third limiting section 124 is low, and the connection strength of the third limiting section 124 and the top cover 11 is poor. If the ratio of the size of the third limiting section 124 to the size of the top cover 11 is greater than 0.5, the thickness of the third limiting section 124 is too large, the space occupied is large, the connecting groove 112 is large, and the thickness of the position of the top cover 11 provided with the connecting groove 112 is small, and the structural strength of the top cover 11 is low. Therefore, in the embodiment of the utility model, the ratio of the size of the third limiting section 124 to the size of the top cover 11 is set to be between 0.2 and 0.5, for example, it can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.35, 0.4, 0.45, 0.5, so that the third limiting section 124 maintains high structural strength, and at the same time, it is not necessary to open a large connecting groove 112 on the top cover 11, thereby reducing the negative impact on the top cover 11.

[0071] In an embodiment, referring to Figure 5 and Figure 6 , the first limiting section 122 and the second limiting section 123 are both at least two, and the at least two first limiting sections 122 are oppositely arranged, so that the bearing part 121, the first limiting section 122 and the second limiting section 123 form an opening 125, and the pole 13 can be inserted between the second limiting sections 123 from the opening 125.

[0072] Through the design of the bearing part 121, the first limiting section 122 and the second limiting section 123 forming the opening 125, the pole 13 can be directly inserted between the second limiting sections 123 from the opening 125, without a complex operation path, simplifying the assembly process, reducing the production difficulty and the precision requirement of the assembly equipment, improving the production efficiency, and reducing the possibility of human error.

[0073] In an embodiment, referring to Figure 1 , the upper surface of the pole 13 is provided with a positioning hole 133, and the positioning hole 133 is strip-shaped.

[0074] By observing the relative position and angle of the strip-shaped positioning hole 133 and the welding piece 12, it can be determined whether the pole column 13 and the welding piece 12 are accurately matched, so that the direction and position of the pole column 13 can be adjusted accordingly, thereby reducing the positioning error caused by the deviation of the pole column 13, and improving the overall precision of the assembly. For example, when the positioning hole 133 is perpendicular to the second limiting segment 123 on the welding piece 12, the pole column 13 is at the correct angle, thereby facilitating the worker to check the installation state of the pole column 13, and thereby improving the yield of the top cover assembly 1. It can be understood that the shape of the positioning hole 133 can be set according to actual needs, for example, the positioning hole 133 can be rectangular, oval or other shapes, as long as it can judge the angle of the pole column 13 by means of the positioning hole 133, and the present application does not limit this.

[0075] The embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A cap assembly, characterized by, A top cover assembly for connecting tabs in a battery cell, the top cover assembly comprising: a top cover having a first through hole defined therein; a welding member at least partially disposed in the first through hole, the welding member comprising a bearing portion, a first limiting segment and a second limiting segment, the first limiting segment and the bearing portion being disposed at two ends of the second limiting segment and extending towards the first through hole along an axial direction of the first through hole; a post spaced apart from the welding member, the post comprising a main body and a protruding portion protruding from a peripheral side surface of the main body; an upper plastic member comprising a first segment, a second segment, a third segment and a fourth segment connected in sequence, the second segment being clamped between the first limiting segment and the main body, the first segment and the third segment being connected to two ends of the second segment along the axial direction of the first through hole and extending away from the post, the first limiting segment being at least partially clamped between the first segment and the third segment, and the fourth segment being clamped between the second limiting segment and the protruding portion.

2. The roof assembly of claim 1, wherein, The upper plastic member further comprises a fifth segment connected to an end of the fourth segment away from the third segment, and the fifth segment is clamped between the protruding portion and the bearing portion.

3. The roof assembly of claim 1, wherein, The top cover assembly further comprises a sealing member at least partially connected to an upper surface of the bearing portion so that the sealing member can be mounted on the bearing portion, and the post is connected to the sealing member.

4. The roof assembly of claim 3, wherein, The bearing portion has a second through hole defined therein, and the sealing member comprises: a mounting segment clamped between the post and the bearing portion; a connecting segment connected to an end of the mounting segment close to the second through hole and extending towards the second through hole along an axial direction of the second through hole, and the connecting segment abuts against a side wall of the second through hole.

5. The roof assembly of claim 1, wherein, The welding member further comprises a third limiting segment disposed on a side of the second limiting segment away from the bearing portion, and an end of the third limiting segment away from the second limiting segment is connected to the top cover.

6. The roof assembly of claim 5, wherein, The second limiting segment comprises a first surface away from the post, the third limiting segment is connected to a side wall of the first through hole, and the first surface is spaced apart from the side wall of the first through hole; The upper plastic member further comprises a sixth segment connected to an end of the first segment away from the second segment, and the sixth segment extends along the first surface so that the sixth segment is at least partially clamped between the side wall of the first through hole and the first surface.

7. The roof assembly of claim 6, wherein, The top cover has a connecting groove defined therein, and an opening of the connecting groove faces the side wall of the first through hole, and part of the third limiting segment is accommodated in the connecting groove.

8. The roof assembly of claim 7, wherein, Along the axial direction of the first through hole, a ratio of a size of the third limiting segment to a size of the top cover is between 0.2 and 0.

5.

9. The roof assembly of any one of claims 1 to 8, wherein, The first limiting segment and the second limiting segment are both at least two, and at least two second limiting segments are oppositely disposed so that the bearing portion, the first limiting segment and the second limiting segment form an opening, and the post can be inserted into the second limiting segments from the opening.

10. The roof assembly of any one of claims 1 to 8, wherein, An upper surface of the post has a positioning hole defined therein, and the positioning hole is strip-shaped.

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