Secondary battery and case assembly thereof
By creating a pressure relief structure by opening thinning blind grooves on the cover sheet, the problems of lithium-ion battery cover deformation and sealing nail complexity are solved, achieving the effects of simplified manufacturing and improved welding reliability.
Patent Information
- Application Number
- CN202520303934.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-24
AI Technical Summary
When the existing fully sealed laser-welded square shell assembly of lithium-ion batteries is engraved with lines on a large-size cover plate to form a pressure relief structure, it is easy to cause the cover plate to deform. In addition, the sealing nail structure is complex and difficult to manufacture.
A pressure relief structure is formed by creating a thinning blind groove on the cover plate, which simplifies the design of the sealing nail. The pressure relief structure is formed by melting the thinning blind groove at a preset temperature, avoiding the scribing method. The cover plate and the outer shell are sealed together by a surface-to-surface mating method.
The problem of cover plate deformation was solved, the manufacturing process of sealing nails was simplified, and the welding reliability and sealing performance were improved.
Smart Images
Figure CN223843107U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a battery used in the field of new energy, and more particularly to a secondary battery and its casing assembly used in the field of new energy. Background Technology
[0002] As is well known, lithium-ion batteries are a type of secondary battery (rechargeable battery or storage battery) that can be widely used in the new energy field. With significant improvements in energy density, cycle life and safety, they are becoming increasingly popular in the new energy field.
[0003] Currently, for lithium-ion battery slab modules using fully sealed laser welding, the module includes an outer shell, terminal posts, and sealing pins. The outer shell comprises a housing and a cover. The pressure relief structure is located on the cover plate and is formed within it by scribing. However, because the cover plate is a large, sheet-like structure, scribing can easily cause deformation, affecting the laser sealing weld between the cover plate and the housing, resulting in poor welding (e.g., incomplete welds).
[0004] Although there are also products on the market that have etched lines on the sealing nails to create a pressure relief structure, the complex structure of these sealing nails makes them difficult to manufacture.
[0005] Therefore, there is an urgent need for a secondary battery and its casing assembly to overcome the above-mentioned defects. Utility Model Content
[0006] One objective of this invention is to provide a casing assembly for a secondary battery, which solves the problem of deformation of the cover plate caused by forming a pressure relief structure by scribing lines on a large cover plate, and simplifies the manufacturing of the sealing nails.
[0007] Another objective of this invention is to provide a secondary battery that, on the one hand, solves the problem of deformation of the cover plate caused by forming a pressure relief structure by scribing lines on a large cover plate, and on the other hand, simplifies the manufacturing of the sealing nails.
[0008] To achieve the above objectives, the secondary battery casing assembly of this utility model includes a casing, an electrode assembly, and a sealing pin. The casing has a first through hole and a second through hole. The electrode assembly passes through the first through hole and is assembled and connected to the casing. The electrode assembly also seals the first through hole. The sealing pin includes a cover plate that covers the second through hole and fits face-to-face with the casing, and a thinning blind groove for reducing the thickness of the cover plate. The position where the cover plate is thinned by the thinning blind groove forms a pressure relief structure opposite to the second through hole and melts at a preset temperature. The cover plate is also sealed to the casing.
[0009] Compared with the prior art, the outer shell assembly of this utility model forms a pressure relief structure on the cover plate by creating a thinning blind groove, which simplifies the structure of the sealing nail and makes it easier to manufacture. Furthermore, since the pressure relief structure is formed on the cover plate of the sealing nail, it solves the problem of deformation of the cover plate caused by forming the pressure relief structure by scribing lines on large-sized cover plates.
[0010] Preferably, the opening of the thinning blind groove is located on the end face of the cover sheet facing and / or away from the second through hole.
[0011] Preferably, the cross-sectional profile of the thinned blind groove is "V" shaped.
[0012] Preferably, the projection of the thinning blind groove in the thickness direction of the cover sheet is circular, elliptical, polygonal, arc-shaped, "V"-shaped, "Y"-shaped, or "X"-shaped.
[0013] Preferably, the end face of the cover plate facing the second through hole is parallel to the end face of the cover plate facing away from the second through hole.
[0014] Preferably, the outer casing includes a housing, the housing includes an end wall and a plurality of side walls surrounding the end wall, the first through hole is located on a first side wall among the plurality of side walls, the second through hole is located on a second side wall among the plurality of side walls, the pole post assembly is assembled and connected to the first side wall, and the cover plate is surface-fitted and sealed with the second side wall.
[0015] Preferably, the first sidewall and the second sidewall are arranged to intersect, the first through hole is adjacent to the second sidewall, and the second through hole is adjacent to the first sidewall.
[0016] Preferably, the end wall has a flat structure.
[0017] Preferably, the electrode assembly includes an electrode, a first insulating member facing the inner side of the first sidewall, and a second insulating member facing the outer side of the first sidewall. Both the second insulating member and the first insulating member have through holes. The electrode has a through body that passes through the through holes and the first through hole and is insulated from the first through hole, and an outward protrusion structure that protrudes laterally from the through body from both ends of the through body. The outward protrusion structure causes the first insulating member and the second insulating member to clamp the first sidewall.
[0018] Preferably, the pole assembly further includes a metal washer that is sleeved on the insert body and sandwiched between the second insulating member and the protruding structure opposite to the second insulating member.
[0019] Preferably, the first insulating member has a first side and a second side, the first side being directly opposite the first sidewall and the second side being opposite to the first sidewall.
[0020] Preferably, the first side has an outwardly protruding ring that passes through the first through hole and is partially embedded in the perforation of the second insulating member, and the perforation of the first insulating member also penetrates the outwardly protruding ring.
[0021] Preferably, the first side and / or the second side are provided with a convex ring structure arranged around the center line of the perforation of the first insulating member. The convex ring structure is arranged outwardly offset from the perforation. The convex ring structure on the first side is squeezed against the inner side of the first sidewall, and the convex ring structure on the second side is squeezed against the corresponding outer convex structure.
[0022] Preferably, the end of the first insulating member adjacent to the end wall is bent and extends into a barrier arranged parallel to the end wall.
[0023] To achieve the above objectives, the secondary battery of this invention includes the aforementioned outer casing assembly and an electrode core with a first tab and a second tab. The first tab is electrically connected to the terminal assembly, and the second tab is electrically connected to the outer casing.
[0024] Compared to existing technologies, the sealing pin structure is simpler and easier to manufacture because the pressure relief structure can be formed on the cover plate by creating a thinning blind groove. Furthermore, since the pressure relief structure is formed on the cover plate of the sealing pin, the defect of easily causing cover plate deformation when forming the pressure relief structure by scribing on large-sized cover plates is solved. Attached Figure Description
[0025] Figure 1 This is a perspective view of the secondary battery of this utility model.
[0026] Figure 2 yes Figure 1 The image shows a three-dimensional view of the secondary battery from another angle.
[0027] Figure 3 yes Figure 2 The diagram shows a secondary battery viewed in the direction indicated by the arrow next to it.
[0028] Figure 4 It is along Figure 3 Internal view of the section cut along line AA.
[0029] Figure 5 yes Figure 4 Enlarged view of section C.
[0030] Figure 6 It is along Figure 3Internal view of the section cut along the BB line.
[0031] Figure 7 yes Figure 6 Enlarged view of section D.
[0032] Figure 8 yes Figure 2 The diagram shown is an exploded 3D view of a secondary battery.
[0033] Figure 9 yes Figure 8 A further exploded 3D diagram.
[0034] Figure 10 yes Figure 8 A 3D view showing the concealed cover plate and sealing pins.
[0035] Figure 11 yes Figure 10 A 3D view of the hidden electrode core.
[0036] Figure 12 yes Figure 11 3D exploded view.
[0037] Figure 13 This is a plan view of the sealing nail in the secondary battery of this utility model, viewed in its thickness direction.
[0038] Figure 14 Yes Figure 13 The sealing nail shown is a deformed plan view.
[0039] Figure 15 Yes Figure 13 The diagram shows a further deformation of the sealing nail.
[0040] Figure 16 Yes Figure 13 The diagram shows another deformation of the sealing nail.
[0041] Figure 17 Yes Figure 1 The image shows a three-dimensional view of the deformation of the secondary battery. Detailed Implementation
[0042] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0043] Please see Figure 1 , Figure 2 , Figure 4 and Figure 9 The secondary battery 1000 of this utility model includes a housing assembly 100 (see...). Figure 9and an electrode core 200 having a first tab 210 and a second tab 220. The first tab 210 is electrically connected to the electrode post assembly 20 described below, and the second tab 220 is electrically connected to the housing 10 described below; alternatively, in Figure 4 and Figure 9 In this example, the electrode core 200 can be a stacked electrode core; obviously, depending on actual needs, the electrode core 200 can also be a wound electrode core, so this is not used as an example. Figure 4 and Figure 9 The limitation is that it is limited.
[0044] Combined Figure 5 , Figure 6 and Figure 7 The housing assembly 100 includes a housing 10, a pole post assembly 20, and a sealing pin 30. The housing 10 has a first through hole 11 and a second through hole 12. Optionally, [the following is omitted as the text is incomplete and requires further context]. Figure 12 In this example, the first through hole 11 and the second through hole 12 are both circular holes to facilitate their fabrication on the housing 10; obviously, depending on actual needs, the first through hole 11 and the second through hole 12 can also be other shapes known in the art, therefore, they are not considered as such. Figure 12 The diagram shows a limited extent. The electrode assembly 20 passes through the first through hole 11 and is assembled and connected to the housing 10. The electrode assembly 20 also seals the first through hole 11. (See diagram for details.) Figure 5 As shown.
[0045] The sealing pin 30 includes a cover plate 31 that covers the second through hole 12 and is in surface-to-surface contact with the outer casing 10, and a thinning blind groove 32 for reducing the thickness of the cover plate 31. The position where the cover plate 31 is thinned by the thinning blind groove 32 forms a pressure relief structure 33 that is opposite to the second through hole 12 and melts at a preset temperature. The cover plate 31 is also sealed to the outer casing 10. (See attached diagram.) Figure 6 and Figure 7 As shown; alternatively, as an example, both the sealing pin 30 and the housing 10 can be made of metal. In this case, the cover plate 31 of the sealing pin 30 is welded to the housing 10 to improve the reliability of the connection and seal between the sealing pin 30 and the housing 10. When the housing 10 is made of metal, stainless steel or other alloy materials are preferred. More specifically, as follows:
[0046] like Figure 6 and Figure 7As shown, as an example, the opening 321 of the thinning blind groove 32 is located on the end face 311 of the cover plate 31 facing away from the second through hole 12. This design allows the operator to better control the relative position between the thinning blind groove 32 and the second through hole 12 during the welding process between the cover plate 31 and the outer shell 10. Obviously, depending on actual needs, the opening 321 of the thinning blind groove 32 can also be located on the end face 312 of the cover plate 31 facing the second through hole 12; or, the opening 321 of the thinning blind groove 32 can be located on both the end face 312 of the cover plate 31 facing the second through hole 12 and the end face 311 facing away from the second through hole 12, that is, the thinning blind groove 32 is respectively opened on the two sides of the cover plate 31 facing and facing away from the second through hole 12. In addition, Figure 7 In this example, the cross-sectional profile of the thinning blind groove 32 is "V"-shaped to simplify its structure and facilitate its fabrication on the cover plate 31. Obviously, depending on actual needs, the cross-sectional profile of the thinning blind groove 32 can also be other shapes well-known in the art, therefore, it is not specified here. Figure 7 The above is a limited description. Furthermore, regarding… Figure 13 In this example, the projection of the thinning blind groove 32 of the sealing pin 30 onto the thickness direction of the cover plate 31 is circular; obviously, depending on actual needs, the projection of the thinning blind groove 32 of the sealing pin 30 onto the thickness direction of the cover plate 31 can also be other shapes; for example, in Figure 14 In the middle, the projection of the thinning blind groove 32' of the sealing nail 30' onto the thickness direction of the cover plate 31 is a semi-circle, which is a type of arc shape; Figure 15 In the middle, the projection of the thinning blind groove 32' of the sealing nail 30' onto the thickness direction of the cover plate 31 is two back-to-back and connected semicircles; Figure 16 In the middle, the projection of the thinning blind groove 32 of the sealing nail 30 onto the thickness direction of the cover plate 31 is an "X" shape. It should be noted that, besides... Figures 13 to 16 Besides the shape shown, the projection of the thinning blind groove 32 of the sealing nail 30 onto the thickness direction of the cover plate 31 can also be elliptical, polygonal, "V" shaped, or "Y" shaped, etc., therefore it is not limited to the shape shown. Figures 13 to 16 The above is for reference only; furthermore, to ensure that the thickness of the cover plate 31 of the sealing pin 30 (30', 30'', 30''') is consistent at all locations except where the thinning blind groove 32 is located, the end face 312 of the cover plate 31 facing the second through hole 12 and the end face 311 of the cover plate 31 facing away from the second through hole 12 are designed to be parallel to each other, as shown in the figure. Figure 7 As shown.
[0047] like Figures 1 to 2 and Figures 8 to 12As shown, as an example, the outer casing 10 includes a shell 10a, which includes an end wall 131 and four side walls surrounding the end wall 131. For ease of description, the four side walls are named the first side wall 132, the second side wall 133, the third side wall 134, and the fourth side wall 135, respectively, so that the shell 10a formed by the end wall 131 and the first to fourth side walls 135 is square. Since the number of side walls is determined by the shape of the end wall 131, the number of side walls is not determined by the shape of the end wall 131. Figures 1 to 2 and Figures 8 to 12 The diagram is for illustrative purposes only. When the outer casing 10 includes a housing 10a, and the housing 10a includes an end wall 131 and four side walls surrounding the end wall 131, then the first through hole 11 is located on the first side wall 132, the second through hole 12 is located on the second side wall 133, the pole post assembly 20 is assembled and connected to the first side wall 132, and the cover plate 31 is surface-to-surface fitted and sealed to the second side wall 133. Specifically, in Figures 8 to 12 In this example, the first sidewall 132 and the second sidewall 133 are arranged intersectingly, the first through hole 11 is adjacent to the second sidewall 133, and the second through hole 12 is adjacent to the first sidewall 132, so that the pole post assembly 20 and the sealing pin 30 are arranged at the corner of the first sidewall 132 and the second sidewall 133. On the one hand, this more effectively avoids the opening of the first through hole 11 from affecting the strength of the first sidewall 132, and the opening of the second through hole 12 from affecting the strength of the second sidewall 133. On the other hand, it provides more sufficient space for the electrical connection between the second pole tab 220 of the pole core 200 and the first sidewall 132. In addition, the end wall 131 has a flat structure to facilitate the manufacture of the housing 10a.
[0048] like Figures 1 to 5 and Figures 8 to 12 As shown, as an example, the pole assembly 20 includes a pole 21 and an inner side surface 1321 of the first sidewall 132 (see Figure 1321). Figure 5 The first insulating member 22 facing each other and the outer side surface 1322 of the first sidewall 132 (see) Figure 5The second insulating member 23 faces each other and has a through hole 231. The first insulating member 22 has a through hole 221. Optionally, as an example, the through holes 221 (231) are all circular holes to facilitate the production of the through holes 221 (231). Obviously, depending on actual needs, the through holes 221 (231) can also be other shapes known in the art. Additionally, the pole post 21 has a through-hole 221 (231) that passes through the through hole 221 (231) and the first through hole 11 and is insulated from the first through hole 11, and an outwardly protruding structure 212 (213) that protrudes laterally from the through-hole 211 from both ends of the through-hole 211. The outwardly protruding structure 212 (213) clamps the first insulating member 22 and the second insulating member 23 to the first sidewall 132; thus achieving the purpose of assembling and connecting the pole post assembly 20, which passes through the first through hole 11, with the outer shell 10 and sealing the first through hole 11, and ensuring that the pole post 21 in the pole post assembly 20 is insulated from the outer shell 10. Specifically, in Figures 1 to 5 and Figures 8 to 12 In this example, the pole assembly 20 further includes a metal washer 24, which is sleeved on the insert 211. The metal washer 24 is also sandwiched between the second insulator 23 and the protruding structure 212 opposite to the second insulator 23. Therefore, during the process of forming the aforementioned protruding structure 212 after the end of the pole 21 is riveted, the metal washer 24 bears the riveting thrust of the pole 21 on the second insulator 23, preventing the second insulator 23 from being damaged, thereby improving the insulation and sealing performance of the second insulator 23. Alternatively, in Figure 5 In this example, the outer diameter of the metal washer 24 is larger than the outer diameter of the convex structure 212 and smaller than the outer diameter of the second insulating member 23, but not... Figure 5 The above is for illustrative purposes only; additionally, the metal washer 24 and the pole post 21 may be made of metal materials, for example, the metal washer 24 is preferably made of stainless steel or other alloy materials, and the pole post 21 is preferably made of aluminum or other metal materials; furthermore, the first insulating element 22 and the second insulating element 23 may be made of plastic or composite materials, preferably PP, PPS or other corrosion-resistant plastic materials.
[0049] like Figure 5 As shown, as an example, the first insulating member 22 has a first side surface 222 and a second side surface 223, the first side surface 222 facing the first sidewall 132, and the second side surface 223 facing away from the first sidewall 132. Furthermore, in... Figure 5As an example, the first side 222 is provided with an outwardly protruding ring 224 that passes through the first through hole 11 and is partially embedded in the through hole 231 of the second insulating member 23. At this time, the through hole 221 of the first insulating member 22 also passes through the outwardly protruding ring 224, so as to achieve insulation separation between the pole post 21 and the outer casing 10 by means of the outwardly protruding ring 224. Since the outwardly protruding ring 224 is partially embedded in the through hole 231 of the second insulating member 23, it prevents the outwardly protruding ring 224 from moving closer to the metal washer. The 24 protrudes outward from the second insulating member 23, preventing interference with the metal washer 24 used to press against the second insulating member 23, thus ensuring the reliability of the metal washer 24 pressing against the second insulating member 23. Furthermore, since the convex ring 224 is partially embedded in the through hole 231 of the second insulating member 23, it can provide assembly positioning for the second insulating member 23 during the process of forming the convex structure 212 after the end of the pole post 21 is riveted, thereby facilitating the assembly operation of the second insulating member 23. In addition, in Figure 5 As an example, the first side 222 and the second side 223 are each provided with a convex ring structure 225 arranged around the center line L of the through hole 221 of the first insulating member 22. The convex ring structure 225 is staggered outward relative to the through hole 221. The convex ring structure 225 on the first side 222 is squeezed against the inner side 1321 of the first side wall 132, and the convex ring structure 225 on the second side 223 is squeezed against the corresponding outer convex structure 213. With the help of the convex ring structure 225, the first insulating member 22 is better pre-pressed against the electrode 21 and the first side wall 132 respectively when the electrode 21 is riveted, forming a reliable sealing effect, thereby improving the sealing effect of the secondary battery 1000 of this utility model. It is understood that, according to actual needs, only the first side 222 or the second side 223 may be provided with the convex ring structure 225, so it is not necessary to specify the convex ring structure 225. Figure 5 The above is the limit.
[0050] For example Figure 5 As shown, as an example, the end of the first insulating member 22 adjacent to the end wall 131 is bent and extends into a barrier 226 arranged parallel to the end wall 131. This barrier 226, by virtue of its position, better protects the polarity insulation when the pole post 21 (specifically, the outwardly protruding structure 213) is welded to the first electrode tab 210, thus avoiding the risk of a short circuit due to contact between the first electrode tab 210 and the outer casing 10. Specifically, in Figure 12 In the example, the first insulating member 22 is roughly "L" shaped, wherein the barrier body 226 forms the short side of the "L" shape, and the position of the first insulating member 22, except for the outer protruding ring body 224, forms the long side of the "L" shape.
[0051] like Figures 1 to 8As shown, as an example, the housing 10 also includes a cover plate 10b for covering the receiving cavity 136 enclosed by the end wall 131 and all the side walls. The cover plate 10b is also sealed and welded to all the side walls of the housing 10a to facilitate the assembly operation of the pole core 200 with the housing 10. Alternatively, the cover plate 10b may be made of the same or different hardware material as the housing 10a, and steps may be provided on all or part of the side walls of the cover plate 10b and the housing 10b to facilitate assembly positioning.
[0052] In summary, the assembly process of the secondary battery 1000 of this utility model is as follows: First, the electrode core 200 is installed inside the outer casing assembly 100, and the first electrode tab 210 of the electrode core 200 is welded to the electrode post 21, and the second electrode tab 220 of the electrode core 200 is welded to the casing 10a; then, the cover plate 10b is placed on the casing 10a, and the cover plate 10b is laser welded to the casing 10a for sealing; then, electrolyte is injected through the second through hole 12; finally, the sealing nail 30 is covered by the second through hole 12 and laser welded to the casing 10a for sealing.
[0053] Please see Figure 17 It is a Figure 1 The deformation of the secondary battery is shown. Figure 17 In the middle, because the end wall 131' of the shell 10a' in the outer shell 10' is irregularly shaped, correspondingly, it causes Figure 14 The secondary battery 1000' shown has an irregular shape, and the electrode core 200 is also irregularly shaped. Furthermore, because the end wall 131' is a hexagonal irregular shape, this results in an increase in the number of side walls of the casing 10a'. Specifically, a fifth side wall 138 and a sixth side wall 139 are added between the second side wall 133 and the third side wall 134, as shown in the diagram. Figure 17 As shown.
[0054] And at Figure 1 In the middle, since the end wall 131 of the secondary battery 1000 is square, correspondingly, it makes Figure 1 The secondary battery 1000 shown is square; and since the end wall 131 is square, the corresponding number of side walls of the casing 10a is four.
[0055] Apart from the differences mentioned above, the two are the same, so they will not be repeated here.
[0056] Compared with the prior art, since the pressure relief structure 33 can be formed on the cover plate 31 by creating a thinning blind groove 32, the structure of the sealing nails 30 (30', 30'', 30''') is simple and easy to manufacture. In addition, since the pressure relief structure 33 is formed on the cover plate 31 of the sealing nails 30 (30', 30'', 30'''), the defect that the pressure relief structure is easily deformed on the large-sized cover plate 10b (10b') when formed by scribing is solved.
[0057] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.
Claims
1. A casing assembly for a secondary battery, comprising a casing, an electrode assembly, and a sealing pin, wherein the casing has a first through hole and a second through hole, the electrode assembly passes through the first through hole and is assembled and connected to the casing, and the electrode assembly also seals the first through hole, characterized in that, The sealing pin includes a cover plate that covers the second through hole and fits face-to-face with the outer shell, and a thinning blind groove for reducing the thickness of the cover plate. The position where the cover plate is thinned by the thinning blind groove forms a pressure relief structure opposite to the second through hole and is melted at a preset temperature. The cover plate is also sealed to the outer shell.
2. The housing assembly according to claim 1, characterized in that, The opening of the thinning blind groove is located on the end face of the cover sheet facing and / or away from the second through hole; the cross-sectional profile of the thinning blind groove is "V" shaped.
3. The housing assembly according to claim 1, characterized in that, The projection of the thinning blind groove in the thickness direction of the cover sheet is circular, elliptical, polygonal, arc-shaped, "V"-shaped, "Y"-shaped, or "X"-shaped; the end face of the cover sheet facing the second through hole and the end face of the cover sheet facing away from the second through hole are parallel to each other.
4. The housing assembly according to claim 1, characterized in that, The outer casing includes a housing, which includes an end wall and a plurality of side walls surrounding the end wall. The first through hole is located on a first side wall among the plurality of side walls, and the second through hole is located on a second side wall among the plurality of side walls. The pole post assembly is assembled and connected to the first side wall, and the cover plate is surface-fitted and sealed to the second side wall.
5. The housing assembly according to claim 4, wherein the first sidewall and the second sidewall are arranged intersectingly, the first through hole is adjacent to the second sidewall, and the second through hole is adjacent to the first sidewall; the end wall is a flat structure.
6. The housing assembly according to claim 4, characterized in that, The pole assembly includes a pole, a first insulating member facing the inner side of the first sidewall, and a second insulating member facing the outer side of the first sidewall. Both the second insulating member and the first insulating member have through holes. The pole has a through body that passes through the through hole and the first through hole and is insulated from the first through hole, and an outward protrusion structure that protrudes outward from the two ends of the through body. The outward protrusion structure causes the first insulating member and the second insulating member to clamp the first sidewall.
7. The housing assembly according to claim 6, characterized in that, The pole assembly also includes a metal washer, which is sleeved on the insert body and sandwiched between the second insulating member and the protruding structure opposite to the second insulating member.
8. The housing assembly according to claim 6, characterized in that, The first insulating member has a first side and a second side, the first side being directly opposite the first sidewall and the second side being opposite to the first sidewall.
9. The housing assembly according to claim 8, characterized in that, The first side has an outwardly protruding ring that passes through the first through hole and is partially embedded in the through hole of the second insulating member, and the through hole of the first insulating member also passes through the outwardly protruding ring; the first side and / or the second side has a protruding ring structure arranged around the center line of the through hole of the first insulating member, the protruding ring structure being staggered outward relative to the through hole, the protruding ring structure on the first side is squeezed against the inner side of the first sidewall, and the protruding ring structure on the second side is squeezed against the corresponding outwardly protruding structure; The first insulating member extends from the end adjacent to the end wall by bending, forming a barrier arranged parallel to the end wall.
10. A secondary battery comprising a core with a first tab and a second tab, characterized in that, The secondary battery further includes a housing assembly according to any one of claims 1 to 9, wherein the first tab is electrically connected to the terminal assembly and the second tab is electrically connected to the housing.