Cover plate assembly

Abstract

The utility model provides a kind of cover plate assembly, cover plate assembly includes negative pole, negative pole includes first column and second column, first column includes first column main body and connecting portion, connecting portion is connected to the part surface of first column main body along the circumference of first column main body;The material of first column and second column is different;Second column includes second column main body and hooking portion, second column main body is connected to the lower end surface of first column main body;Hooking portion extends from the surface of second column body towards first column and does not contact the lower end surface of first column main body, hooking portion wraps connecting portion, and the sidewall between connecting portion and the lower end surface of first column main body of first column body.Lower end surface of the negative pole by setting the connecting portion and hooking portion of cooperation can improve the fastening between first column and second column.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly. Background Technology

[0002] Square batteries are a commonly used structure for lithium-ion power batteries. They generally include a casing, cell assembly, and cover plate. The cell assembly is located inside the casing, and the cover plate covers the open end of the casing. The cover plate includes a cover plate body and terminals mounted on the cover plate body. The terminals are used for electrical connection between the cell assembly and external electrical equipment.

[0003] To reduce the cost of the electrode while ensuring its conductivity, engineers designed a negative electrode that uses different materials spliced ​​together, such as a copper-aluminum negative electrode. The copper-aluminum negative electrode can be directly formed on existing copper-aluminum composite plates, or the copper and aluminum segments can be spliced ​​together using methods such as friction welding.

[0004] However, existing negative electrode posts suffer from an inherent defect: the composite interface is prone to detachment under extreme operating conditions of high rate or excessive current. This is because Joule heating is generated at the composite interface due to microscopic contact resistance when current flows through it. High current causes intense heat accumulation, leading to a rapid rise in interface temperature. Since different materials have significantly different coefficients of thermal expansion—for example, in copper-aluminum negative electrode posts, aluminum expands much more than copper—this generates enormous thermal shear stress at the interface. This stress, after weakening the material strength at high temperatures, easily leads to the peeling and detachment of the metallurgical bonding layer.

[0005] If the composite interface detaches, it will cause a sharp increase in circuit resistance, leading to exacerbated local overheating and potentially triggering thermal runaway, posing a serious safety hazard. Detachment of the composite interface can also directly cause an internal open circuit in the battery, resulting in instantaneous battery failure. Furthermore, the high temperature may melt surrounding sealing plastic components, causing electrolyte leakage, which can further lead to short circuits, fires, and explosions, severely impacting the overall safety and lifespan of the battery pack. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the defect of easy detachment of the composite surface of the negative electrode post in the prior art, and to provide a cover plate assembly.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution:

[0008] This utility model provides a cover plate assembly, which includes a negative electrode post, the negative electrode post including a first post and a second post, the first post including a first post body and a connecting part, the connecting part being connected to a portion of the surface of the first post body along the circumference of the first post body; the first post and the second post are made of different materials; the second post including a second post body and a hooking part, the second post body being connected to the lower end face of the first post body; the hooking part extending from the surface of the second post body toward the first post and not in contact with the lower end face of the first post body, the hooking part wrapping around the connecting part, and the first post body being a sidewall located between the connecting part and the lower end face of the first post body.

[0009] In this design, the negative electrode post improves the tightness between the first and second posts by incorporating a matching connecting part and a hook-on part. Specifically, the force driving the first and second posts to separate is primarily stress along the axial direction of the negative electrode post. Since the connecting part is located along the outer peripheral wall of the first post body, it is wrapped by the hook-on part at least along the direction having a radial component of the negative electrode post. When stress occurs, the inner wall surface of the hook-on part generates a supporting force on the end face of the connecting part, which has at least a axial component of the negative electrode post. This supporting force counteracts the stress, thereby reducing the tendency for the first and second posts to separate and thus improving the tightness of the negative electrode post.

[0010] Preferably, the connecting portion includes a first extension section, a second extension section, a third extension section, and a fourth extension section; the radially outer end of the second column body extends along the axial direction of the negative electrode post toward the connecting portion to form the first extension section; the first extension section extends along the radial direction of the negative electrode post toward the direction away from the second column body at one end in the axial direction of the negative electrode post to form the second extension section; the second extension section extends along the axial direction of the negative electrode post toward the direction away from the first extension section at one end in the radial direction of the negative electrode post to form the third extension section; the third extension section extends along the radial direction of the negative electrode post toward the direction close to the first column body at one end in the axial direction of the negative electrode post to form the fourth extension section; the second extension section, the third extension section, and the fourth extension section form a cavity, and the two end faces of the connecting portion in the axial direction of the negative electrode post abut against the second extension section and the fourth extension section, respectively.

[0011] In this design, the specific structure of the connecting part is achieved through the above-mentioned configuration. The second, third, and fourth extension sections form the main structural foundation of the concave cavity, while the first extension section connects the concave cavity structure to the main body of the second column, providing support for the concave cavity structure.

[0012] Preferably, the first extension abuts against the outer peripheral wall of the first column body.

[0013] In this scheme, the above settings make the overall structure of the negative electrode post more compact and prevent the relative movement of the first post and the second post in the radial direction of the negative electrode post.

[0014] Preferably, the third extension and the connecting portion abut against the end face of the negative electrode post that is radially away from the main body of the first post.

[0015] In this solution, with the above-mentioned arrangement, since the third extension section is the bottom wall of the cavity along the radial direction of the negative electrode post, the contact between the third extension section and the connecting part means that the connecting part fully extends into the cavity. This can increase the contact area between the two end faces of the connecting part and the two inner wall surfaces of the cavity, thereby further improving the tightness of the negative electrode post and further preventing the relative movement of the first post and the second post in the radial direction of the negative electrode post.

[0016] Preferably, the fourth extension section abuts against the main body of the first column at the end of the negative electrode column that is radially away from the third extension section.

[0017] In this solution, with the above-mentioned arrangement, since the inner wall surface of the fourth extension is one of the two inner wall surfaces that abut against the connecting part, and the fourth extension abuts against the main body of the first column, it means that the fourth extension covers the entire length of the connecting part. This can increase the contact area between the two end faces of the connecting part and the two inner wall surfaces of the cavity, thereby further improving the tightness of the negative electrode post and further preventing the relative movement of the first column and the second column in the radial direction of the negative electrode post.

[0018] Preferably, the connecting portion is welded to the second extension; and / or, the connecting portion is welded to the fourth extension.

[0019] In this solution, through the above-mentioned setup, the connecting part and the hanging part are integrated by welding on the basis of physical contact, which reduces the risk of failure of the connecting part and the hanging part, thereby further improving the tightness of the negative electrode post and preventing the first post and the second post from moving relative to each other.

[0020] Preferably, the junction of the first extension segment and the second column body is rounded; and / or, the junction of the first extension segment and the second extension segment is rounded; and / or, the junction of the second extension segment and the third extension segment is rounded; and / or, the junction of the third extension segment and the fourth extension segment is rounded.

[0021] In this solution, by adding the arc transition at the junction of each extension section of the hook-up part, the stress concentration generated by the hook-up part when it is under force can be reduced, and the risk of breakage at the junction of each extension section can be reduced. At the same time, the arc transition can also prevent damage to the negative terminal post during installation.

[0022] Preferably, the connecting part is annular and extends circumferentially along the main body of the first column; or, there are multiple connecting parts, which are spaced apart circumferentially along the main body of the first column.

[0023] In this solution, the connection part is located at least on both sides of the first column body in the radial direction, so that the support force is generated on both sides of the first column body at the same time, reducing the risk of failure of the connection part and the hanging part due to uneven force, thereby further improving the tightness of the negative electrode post.

[0024] Preferably, the thickness of the connecting part is 2~3mm, and the thickness of the hanging part is 0.5~1mm.

[0025] In this solution, the above-mentioned configuration ensures the structural strength of the connecting part and the hanging part, thereby further improving the tightness of the connection between the first column and the second column.

[0026] Preferably, the cover plate assembly further includes a cover plate body, which includes a metal plate and an insulating plate stacked with the metal plate; the cover plate body has a through hole for the electrode post, through which the negative electrode post passes, and the end face of the first post facing the insulating plate is the lower end face.

[0027] The positive and progressive effects of this utility model are as follows:

[0028] The cover plate assembly provided by this utility model improves the fastening between the first and second pillars by providing a matching connecting part and a hooking part. Specifically, the force driving the first and second pillars to separate is mainly stress along the axial direction of the negative pillar. Since the connecting part is provided along the outer peripheral wall of the first pillar body, the connecting part is wrapped by the hooking part at least along the direction with the radial component of the negative pillar. When stress is generated, the two inner wall surfaces of the hooking part will generate a supporting force on the two end faces of the connecting part with at least the axial component of the negative pillar. This supporting force counteracts the stress, thereby reducing the tendency for the first and second pillars to separate, and thus improving the fastening degree of the negative pillar. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the negative electrode post according to an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional view of a cover plate assembly according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of the negative electrode post before assembly according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of the second column after the first stamping according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] Negative electrode post 1000

[0035] First column 1

[0036] First column body 101

[0037] Connecting part 102

[0038] Second pillar 2

[0039] Second column main body 201

[0040] Connector 202

[0041] First extension 2021

[0042] Second extension 2022

[0043] Third extension 2023

[0044] Fourth extension 2024

[0045] Cover assembly 2000

[0046] Metal plate 3

[0047] Card connector 301

[0048] Sealing ring 4

[0049] Section 401

[0050] Pressure plate 5

[0051] Cavity 6

[0052] Through hole 7

[0053] Insulation board 8 Detailed Implementation

[0054] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0055] Example 1

[0056] like Figures 1 to 2 As shown, this embodiment provides a secondary battery, including a casing, a cell assembly, and a cover assembly 2000. The cell assembly is disposed inside the casing, and the cover assembly 2000 covers the opening end of the casing. The cover assembly 2000 includes a metal plate 3 and terminals mounted on the metal plate 3. The terminals are used to realize the electrical connection between the cell assembly and external electrical equipment.

[0057] In this embodiment, at least one electrode post is a negative electrode post 1000, which includes a first post 1 and a second post 2. The first post 1 includes a first post body 101 and a connecting portion 102. The connecting portion 102 extends from the outer peripheral wall of the first post body 101 toward the outside of the first post body 101, that is, the connecting portion 102 is connected to a portion of the surface of the first post body 101 circumferentially. The outer peripheral wall of the first post body 101 is the circumferential sidewall of the first post body 101, and the outside of the first post body 101 is the direction away from the first post 1 along the radial direction of the first post body 101. Preferably, the connecting portion 102 extends perpendicular to the outer peripheral wall of the first post 1, that is, entirely along the radial direction of the first post body 101. In other embodiments, the connecting portion 102 may also be at other angles to the outer peripheral wall of the first post 1.

[0058] like Figure 1 As shown, the second column 2 includes a second column body 201 and a connecting portion 202. The second column body 201 is located at one end of the first column body 101 along the axial direction of the negative electrode post 1000. Specifically, the second column body 201 is connected to the lower end face of the first column body 101. The connecting portion 202 extends from the surface of the second column body toward the first column but does not contact the lower end face of the first column body 101. The connecting portion 202 covers the connecting portion 102 and the sidewall of the first column body 101 located between the connecting portion 102 and the lower end face of the first column body 101. The first column 1 and the second column 2 are closely attached to achieve conductivity. One end of the second column 2 hook part 202 is connected to the body of the second column 2, and the other end of the hook part 202 is provided with a cavity 6. The connecting part 102 extends into the cavity 6, and the two end faces of the connecting part 102 in the axial direction of the negative electrode post 1000 respectively abut against the two inner wall surfaces of the cavity 6 in the axial direction of the negative electrode post 1000.

[0059] Thus, the negative electrode post 1000, by providing a matching connecting part 102 and a hook-on part 202, can improve the tightness between the first post 1 and the second post 2. Specifically, the force that drives the first post 1 and the second post 2 to separate is mainly stress along the axial direction of the negative electrode post 1000. Since the connecting part 102 is provided along the outer peripheral wall of the first post body 101, the connecting part 102 extends into the cavity 6 of the hook-on part 202 at least along the direction having a radial component of the negative electrode post 1000. When stress is generated, the two inner wall surfaces of the hook-on part 202 will generate a supporting force on the two end surfaces of the connecting part 102 having at least an axial component of the negative electrode post 1000. This supporting force will counteract the stress, thereby reducing the tendency for the first post 1 and the second post 2 to separate, and thus improving the tightness of the negative electrode post 1000.

[0060] In this embodiment, the mounting portion 202 includes a first extension 2021, a second extension 2022, a third extension 2023, and a fourth extension 2024. The radially outer end of the second column body 201 extends along the axial direction of the negative electrode post 1000 toward the connecting portion 102 to form a first extension segment 2021. The first extension segment 2021 extends along the radial direction of the negative electrode post 1000 toward the direction away from the second column body 201 to form a second extension segment 2022. The second extension segment 2022 extends along the axial direction of the negative electrode post 1000 toward the direction away from the first extension segment 2021 to form a third extension segment 2023. The third extension segment 2023 extends along the radial direction of the negative electrode post 1000 toward the direction close to the first column body 101 to form a fourth extension segment 2024. The second extension segment 2022, the third extension segment 2023, and the fourth extension segment 2024 form a concave cavity 6. The two end faces of the connecting part 102 on the axial direction of the negative electrode post 1000 abut against the second extension segment 2022 and the fourth extension segment 2024, respectively. Among them, the second extension segment 2022, the third extension segment 2023, and the fourth extension segment 2024 are the main structural foundation for forming the concave cavity 6. The first extension segment 2021 is used to connect the structure of the concave cavity 6 with the main body of the second post 201 and provides support for the structure of the concave cavity 6.

[0061] Furthermore, the first extension segment 2021 abuts against the outer peripheral wall of the first column body 101. Thus, through the above arrangement, the overall structure of the negative electrode post 1000 is made more compact, preventing relative movement of the first column 2021 and the second column 2022 in the radial direction of the negative electrode post 1000.

[0062] Furthermore, the third extension 2023 abuts against the connecting portion 102 at one end face of the negative electrode post 1000, away from the first column body 101 in the radial direction. Thus, with the above arrangement, since the third extension 2023 is the bottom wall of the cavity 6 along the radial direction of the negative electrode post 1000, the abutment between the third extension 2023 and the connecting portion 102 means that the connecting portion 102 fully extends into the cavity 6. This increases the contact area between the two end faces of the connecting portion 102 and the two inner wall surfaces of the cavity 6, thereby further improving the tightness of the negative electrode post 1000 and further preventing relative movement of the first column 2021 and the second column 2022 in the radial direction of the negative electrode post 1000.

[0063] Furthermore, such as Figure 1As shown, the fourth extension segment 2024 abuts against the first column body 101 at one end radially away from the third extension segment 2023 of the negative electrode post 1000. Thus, with the above arrangement, since the inner wall surface of the fourth extension segment 2024 is one of the two inner wall surfaces that abut against the connecting portion 102, and the abutment of the fourth extension segment 2024 against the first column body 101 means that the fourth extension segment 2024 covers the entire length of the connecting portion 102. This increases the contact area between the two end faces of the connecting portion 102 and the two inner wall surfaces of the cavity 6, thereby further improving the tightness of the negative electrode post 1000 and further preventing relative movement of the first column 2021 and the second column 2022 radially in the negative electrode post 1000.

[0064] Since the connecting part 102 and the hanging part 202 are prone to slippage and failure due to physical contact relying solely on abutment, the connecting part 102 is welded to the second extension 2022; or, the connecting part 102 is welded to the fourth extension 2024; or, preferably, the connecting part 102 is welded to both the second extension 2022 and the fourth extension 2024 simultaneously. Thus, through the above arrangement, the connecting part 102 and the hanging part 202 are integrated through welding on the basis of physical contact, reducing the risk of contact failure between the connecting part 102 and the hanging part 202, thereby further improving the tightness of the negative electrode post 1000 and further preventing relative movement between the first post 2021 and the second post 2022.

[0065] Furthermore, the junction of the first extension segment 2021 and the second column body 201 is rounded; or, the junction of the first extension segment 2021 and the second extension segment 2022 is rounded; or, the junction of the second extension segment 2022 and the third extension segment 2023 is rounded; or, the junction of the third extension segment 2023 and the fourth extension segment 2024 is rounded. Thus, by adding rounded transitions at the junctions of the extension segments of the hook-up portion 202, i.e., the connection points, the stress concentration generated by the hook-up portion 202 under force can be reduced, reducing the risk of breakage at the junctions of the extension segments. Simultaneously, the rounded transitions can also prevent damage to the negative electrode post 1000 during installation. Since the junction of the first extension segment 2021 and the second extension segment 2022 usually jams with other components during installation, stress concentration is more likely to occur. Therefore, in this embodiment, a rounded transition is provided at the junction of the first extension segment 2021 and the second extension segment 2022.

[0066] Specifically, the connecting part 102 can be configured in two ways: First, the connecting part 102 is an annular flange, extending circumferentially along the first column body 101; second, multiple connecting parts 102 are spaced apart circumferentially along the first column body 101. More preferably, the multiple connecting parts 102 are evenly spaced along the circumferential direction of the first column body 101. Thus, by configuring the connecting parts 102 at least on both sides of the first column body 101 in the radial direction, supporting forces are simultaneously generated on both sides of the first column body 101, reducing the risk of uneven force causing failure of the connection part 102 and the hook part 202, thereby further improving the tightness of the negative electrode post 1000. In this embodiment, the first configuration method is adopted.

[0067] Specifically, in this embodiment, the negative electrode post is a negative electrode post 1000. The first post 1 and the second body 2 are made of different materials. In this embodiment, the negative electrode post 1000 is a copper-aluminum negative electrode post, the first post 1 is made of aluminum, and the second post 2 is made of copper. This gives the negative electrode post 1000 better conductivity. In other alternative embodiments, the negative electrode post 1000 can also be made of other materials.

[0068] Preferably, the thickness of the connecting part 102 is 2-3 mm, and the thickness of the hanging part 202 is 0.5-1 mm. This configuration ensures the structural strength of the connecting part and the hanging part, thereby further improving the tightness of the connection between the first column and the second column.

[0069] In this embodiment, the first column 1 of the negative electrode post 1000 connects to an external electrical device on the side of the cover plate assembly 2000 facing outwards from the secondary battery, and the second column 2 connects to the cell assembly on the side of the cover plate assembly 2000 facing inwards from the secondary battery. Therefore, in this embodiment, the second column body 201 is located at the end of the first column body 101 axially near the cell assembly of the negative electrode post 1000. The metal plate 3 has a through hole 7 for mounting the negative electrode post 1000. Figure 2 The pole piece 1 is installed from top to bottom in the through hole 7, so that the first pole piece 1 protrudes above the metal plate 3 and the second pole piece 2 protrudes below the metal plate 3.

[0070] In other alternative embodiments, the second column body 201 may be disposed at the end of the first column body 101 that is axially away from the cell assembly on the negative electrode post 1000. In this state, the first column 1 is connected to the cell assembly, and the second column 2 is connected to the external electrical equipment.

[0071] Furthermore, in this embodiment, a sealing ring 4 is provided between the second column 2 and the metal plate 3. Specifically, the radial dimension of the second column body 201 is smaller than the dimension of the pole through hole 7. Adding a sealing ring 4 between the edge of the second column 2 and the pole through hole 7 helps to improve the sealing performance of the cover plate assembly 2000. Furthermore, the upper part of the sealing ring 4 extends radially away from the negative pole 1000 along the negative pole 1000 and is provided with an abutment section 401. The abutment section 401 is pressed between the second extension section 2022 and the metal plate 3, which can further improve the firmness of the sealing ring 4.

[0072] Specifically, the cover plate assembly 2000 also includes a pressure plate 5. The pressure plate 5 is pressed axially onto the fourth extension 2024 of the hook-on portion 202 along the negative electrode post 1000. A snap-fit ​​groove (e.g., ...) is provided at the bottom of the pressure plate 5. Figure 2 The image shows the assembled state (the outer contour of the snap-fit ​​component 301 is the snap-fit ​​groove). A snap-fit ​​component 301 extending beyond the surface of the metal plate 3 is also provided on the metal plate 3. The snap-fit ​​component 301 extends into and snaps into the snap-fit ​​groove. There are at least two snap-fit ​​components 301 and snap-fit ​​grooves, with two snap-fit ​​components 301 and snap-fit ​​grooves positioned on both sides of the negative electrode post 1000 along the installation direction of the negative electrode post 1000. The pressure plate 5 is made of insulating material. In this embodiment, the pressure plate 5 is made of plastic and is installed on the metal plate 3 by injection molding.

[0073] Specifically, such as Figure 2 As shown, the cover plate assembly 2000 also includes an insulating plate 8, on which a metal plate 3 is stacked. The insulating plate 8 is used to form an insulating region inside the cover plate assembly 2000. The end face of the first column 1 facing the insulating plate 8 is the lower end face, that is, the end of the negative electrode column 1000 closer to the cell assembly in the axial direction is the lower end face.

[0074] Example 2

[0075] This embodiment further discloses the molding method of the negative electrode post 100 in embodiment 1, based on embodiment 1.

[0076] like Figure 1 , Figure 3 and Figure 4 As shown, first prepare as follows Figure 3 The two material segments shown are the first column 1 and the second column 2. At this point, the second column 2 is simply a flat plate structure. (As shown...) Figure 4 As shown, the second column 2 is first stamped to form the first extension 2021 and the second extension 2022, and the second column 2 partially wraps around the bottom surface of the first column 1; as Figure 1As shown, the second stamping of the second column 2 forms the third extension section 2023 and the fourth extension section 2024 to completely cover the connecting part 102; then the connecting part 102 is connected to the third extension section 2023 and the fourth extension section 2024 by welding to complete the assembly of the negative electrode column 1000.

Claims

1. A cover plate assembly, the cover plate assembly including a negative electrode post, characterized in that, The negative electrode post includes a first post and a second post. The first post includes a main body and a connecting part. The connecting part is connected to a portion of the main body of the first post along the circumference. The first post and the second post are made of different materials. The second column includes a second column body and a hook-on portion. The second column body is connected to the lower end face of the first column body. The hook-on portion extends from the surface of the second column body toward the first column and does not contact the lower end face of the first column body. The hook-on portion wraps around the connecting portion and the side wall of the first column body located between the connecting portion and the lower end face of the first column body.

2. The cover plate assembly as claimed in claim 1, characterized in that, The connecting part includes a first extension section, a second extension section, a third extension section, and a fourth extension section; The radially outer end of the second column body extends along the axial direction of the negative electrode post toward the connecting part to form a first extension segment. The first extension segment extends along the radial direction of the negative electrode post toward the direction away from the second column body to form a second extension segment. The second extension segment extends along the axial direction of the negative electrode post toward the direction away from the first extension segment to form a third extension segment. The third extension segment extends along the radial direction of the negative electrode post toward the direction away from the second column body to form a fourth extension segment. The second, third, and fourth extensions form a concave cavity, and the two end faces of the connecting part on the axial direction of the negative electrode post abut against the second and fourth extensions, respectively.

3. The cover plate assembly as claimed in claim 2, characterized in that, The first extension section abuts against the outer peripheral wall of the first column body.

4. The cover plate assembly as claimed in claim 2, characterized in that, The third extension section and the connecting part abut against the end face of the negative electrode post that is radially away from the main body of the first post.

5. The cover plate assembly as claimed in claim 2, characterized in that, The fourth extension section abuts against the main body of the first column at the end furthest from the third extension section in the radial direction of the negative electrode post.

6. The cover plate assembly as claimed in claim 2, characterized in that, The connecting part is welded to the second extension section; And / or, the connecting part is welded to the fourth extension.

7. The cover plate assembly as claimed in claim 2, characterized in that, The first extension section and the second main column form a rounded transition at their junction; And / or, the junction of the first extension segment and the second extension segment is rounded. And / or, the junction of the second extension and the third extension is rounded. And / or, the junction of the third extension and the fourth extension is a circular arc transition.

8. The cover plate assembly as claimed in claim 1, characterized in that, The connecting part is ring-shaped and extends circumferentially along the main body of the first column; Alternatively, there may be multiple connecting parts, which are spaced apart circumferentially along the main body of the first column.

9. The cover plate assembly as claimed in any one of claims 1 to 8, characterized in that, The thickness of the connecting part is 2~3mm, and the thickness of the hanging part is 0.5~1mm.

10. The cover plate assembly as claimed in any one of claims 1 to 8, characterized in that, The cover plate assembly also includes a cover plate body, which includes a metal plate and an insulating plate stacked with the metal plate; a pole post through hole is formed on the cover plate body, through which the negative pole post passes, and the end face of the first pole post facing the insulating plate is the lower end face.

Images