Cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate assembly and a battery, the cover plate assembly comprises a cover plate body, a first plastic part, a second plastic part and an injection molding fixing structure, the first plastic part is located on the outer side of the cover plate body; the second plastic part is located on the inner side of the cover plate body, a shaping slope is arranged on one side, back to the cover plate body, of the second plastic part, and the tab extends out through the second plastic part, the cover plate body and the first plastic part along the shaping slope; the injection molding fixing structure comprises an injection molding column and an injection molding cavity which are inserted and matched; the first plastic part and the cover plate body are fixed through injection molding of the injection molding columns and the injection molding cavities; and / or the second plastic part and the cover plate body are fixed through injection molding of the injection molding column and the injection molding cavity, connection among the first plastic part, the second plastic part and the cover plate body can be achieved during injection molding, subsequent assembly of the first plastic part, the second plastic part and the cover plate body is not needed, it is ensured that the second plastic part and the battery top cover are firmly fixed, the subsequent assembly procedure can be omitted, and the production efficiency is improved. The production efficiency is improved and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery. Background Art

[0002] As a new type of secondary battery, lithium-ion batteries offer advantages such as high energy and power density, high operating voltage, light weight, compact size, long cycle life, excellent safety, and environmental friendliness. They hold broad application prospects in portable appliances, power tools, large-scale energy storage, and electric transportation power sources. The continuous development of the new energy vehicle industry has led to a growing market for power batteries. While maintaining performance, power batteries also require continuous improvements in energy density and safety.

[0003] like Figure 1 、 Figure 2 as well as Figure 3 As shown, taking a prismatic power battery as an example, the battery includes a housing 1′ and a cover assembly 2′ located at the opening of the housing 1′. The housing 1′ is used to mount a battery cell 3′. The cover assembly 2′ includes a battery top cover 21′, a positive electrode post 22′, a negative electrode post 23′, a positive first plastic part 24′, a negative first plastic part 25′, a second plastic part structure 26′, an explosion-proof valve 27′, etc. The positive and negative tabs 31′ and 32′ of the battery cell 3′ inside the housing 1′ are welded to the corresponding posts via connecting pieces 4′. In the prior art, the positive electrode post 22′ and the negative electrode post 23′ are both inserted and fixed on the battery top cover 21′, occupying part of the space inside the shell 1′. The positive electrode tab 31′, the negative electrode tab 32′ and the connecting piece 4′ are all placed inside the shell 1′, occupying the internal space of the shell 1′, which is not conducive to improving the internal space utilization of the battery shell 1′. Moreover, the tabs located inside the shell 1′ have a poor shape due to space issues, which can easily cause short circuits, resulting in poor battery safety. In the prior art, the second plastic structure 26′ is usually fixed to the inner side of the battery top cover 21′ by relying on the positive electrode post 22′ and / or the negative electrode post 23′. When the positive electrode post 22′ and the negative electrode post 23′ are located outside the battery top cover 21′, the second plastic structure 26′ can no longer be fixed to the abutment.

[0004] Moreover, in the prior art, after the battery top cover 21′, the positive electrode first plastic part 24′, the negative electrode first plastic part 25′, and the second plastic part structure 26′ are usually manufactured, they need to be assembled. The setting of this assembly process makes the production time longer, and the corresponding assembly tooling needs to be set up on the production line, which also increases the cost.

[0005] Therefore, there is an urgent need for a cover plate assembly and a battery to solve the above problems existing in the prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a cover plate assembly and a battery, which can save subsequent assembly steps, improve production efficiency and reduce production costs while ensuring that the second upper plastic part and the battery top cover are firmly fixed.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] In one aspect, a cover plate assembly is provided, comprising:

[0009] Cover plate body;

[0010] a first plastic part, the first plastic part being located on the outer side of the cover body;

[0011] a second plastic part, the second plastic part being located on an inner side of the cover body, the second plastic part being provided with a shaping slope on a side facing away from the cover body, and the tab extending along the shaping slope through the second plastic part, the cover body, and the first plastic part;

[0012] The injection molding fixing structure includes an injection molding column and an injection molding cavity that are plug-fitted;

[0013] The first plastic part and the cover plate body are fixed by injection molding through the injection molding column and the injection molding cavity; and / or the second plastic part and the cover plate body are fixed by injection molding through the injection molding column and the injection molding cavity.

[0014] As a preferred solution of the cover assembly provided by the present invention, the injection molding columns are protruding from the side of the first plastic part facing the cover body and the side of the second plastic part facing the cover body, and the injection molding cavity is provided on the cover body corresponding to each injection molding column.

[0015] As a preferred solution of the cover plate assembly provided by the present invention, the second plastic part is provided with the injection molding columns at both ends and the middle portion along the length direction;

[0016] And / or, the second plastic part is provided with at least two injection molding columns along the width direction;

[0017] And / or, at least two injection molding columns are provided on the first plastic part.

[0018] As a preferred solution of the cover plate assembly provided by the present invention, the injection cavity is recessed and arranged on the cover plate body.

[0019] As a preferred solution of the cover plate assembly provided by the present invention, a first boss is provided on a side of the second plastic part facing the cover plate body, a first through hole is provided on the second plastic part, the first through hole passes through the first boss, and the injection molding column is provided on the second plastic part and is spaced apart from the first boss;

[0020] The cover body is provided with a second through hole, and the first boss is limitedly positioned in the second through hole;

[0021] The first plastic part is provided with a third through hole directly facing the first through hole, and the tab extends through the first through hole and the third through hole.

[0022] As a preferred solution of the cover plate assembly provided by the present invention, the second through hole is a stepped hole, and the second through hole includes a first hole structure and a second hole structure. The cross-sectional size of the first hole structure is larger than the cross-sectional size of the second hole structure. A stepped limiting surface is formed between the first hole structure and the second hole structure. The first boss is limited to the first hole structure and contacts the stepped limiting surface.

[0023] As a preferred solution of the cover assembly provided by the present invention, the second plastic part is provided with two first bosses along the width direction, the second plastic part is provided with two material reduction grooves between the two first bosses, and a support rib is provided between the two material reduction grooves. The bottom wall of the material reduction groove has a slope, and the groove depth of the material reduction groove gradually deepens in the direction close to the support rib, and the support rib is against the cover body.

[0024] As a preferred solution of the cover plate assembly provided by the present invention, the first plastic component includes a first plastic plate body, a second boss is protruding from a side of the first plastic plate body facing away from the cover plate body, and the third through hole passes through the second boss;

[0025] The distance between the outer contour of the second boss and the outer contour of the first plastic plate is greater than or equal to 0 mm and less than or equal to 10 mm; and / or, the distance between the upper surface of the first plastic plate and the upper surface of the cover body is greater than or equal to 0 mm and less than or equal to 0.5H; wherein H is the thickness dimension of the cover body.

[0026] As a preferred solution of the cover assembly provided by the present invention, a receiving groove is provided on a side of the first plastic part facing away from the cover body, and the receiving groove is configured to accommodate a connecting piece and / or a pole electrically connected to the tab;

[0027] And / or, the cover body is provided with a mounting groove, and the first plastic part is installed in the mounting groove.

[0028] On the other hand, a battery is provided, comprising a shell, a battery cell and the cover plate assembly as described above, wherein the battery cell is disposed in the shell, and the cover plate assembly is disposed at an opening of the shell.

[0029] Beneficial effects of the utility model:

[0030] The utility model provides a cover plate assembly and a battery including the cover plate assembly. Since the tabs extend along the shaping slope through the second plastic part and the cover plate body to be electrically connected to the corresponding poles, the tabs are connected to the poles outside the cover plate assembly, avoiding excessive occupation of the internal space of the battery, improving the internal space utilization of the battery, and facilitating the improvement of the energy density of the battery and reducing the size of the battery. Moreover, the setting of the shaping slope can improve the shape of the tabs, protect the tabs, and prevent the tabs from short-circuiting due to a poor folding state. Since the first plastic part and the cover plate body are fixed by injection molding through an injection column and an injection cavity, and the second plastic part and the cover plate body are fixed by injection molding through an injection column and an injection cavity, the connection between the first plastic part, the second plastic part, and the cover plate body can be achieved at the same time as injection molding, without the need for subsequent assembly of the three. While ensuring that the second plastic part and the battery top cover are firmly fixed, the subsequent assembly process can be saved, thereby improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying any creative work.

[0032] Figure 1 is a cross-sectional view of a battery in the prior art;

[0033] Figure 2 is a cross-sectional view of a cover assembly of a battery in the prior art;

[0034] Figure 3 is an axonometric view of a cover plate assembly in the prior art;

[0035] Figure 4 It is a first axonometric view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0036] Figure 5 It is a second axonometric view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0037] Figure 6 This is a first exploded schematic diagram of the cover assembly provided in a specific embodiment of the present utility model;

[0038] Figure 7 This is a second exploded schematic diagram of the cover assembly provided in a specific embodiment of the present utility model;

[0039] Figure 8 It is a top view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0040] Figure 9 yes Figure 8 Partial cross-sectional view from the AA direction;

[0041] Figure 10 yes Figure 8 Section view from the center BB direction.

[0042] Figures 1 to 3 middle:

[0043] 1′, housing; 2′, cover assembly; 3′, battery cell; 4′, connecting piece;

[0044] 21′, battery top cover; 22′, positive electrode column; 23′, negative electrode column; 24′, positive electrode first plastic part; 25′, negative electrode first plastic part; 26′, second plastic part structure; 27′, explosion-proof valve;

[0045] 31′, positive electrode tab; 32′, negative electrode tab.

[0046] Figures 4 to 10 middle:

[0047] 1. Cover plate body; 2. First plastic part; 3. Second plastic part; 4. Injection molding fixing structure; 5. Explosion-proof valve;

[0048] 11. Second through hole; 12. Mounting slot; 13. Liquid injection hole;

[0049] 111. First hole structure; 112. Second hole structure; 113. Stepped limiting surface;

[0050] 20. Third through hole; 21. First plastic plate; 22. Second boss; 23. Accommodation groove;

[0051] 31. Shaping slope; 32. First boss; 33. First through hole; 34. Material reduction groove; 35. Support rib;

[0052] 41. Injection molding column; 42. Injection molding cavity. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0054] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0056] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0057] In this embodiment, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this utility model generally indicates that the related objects are in an "or" relationship.

[0058] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted.

[0059] like Figure 4 、 Figure 5 、 Figure 6 as well as Figure 7 As shown, this embodiment provides a cover assembly, including a cover body 1, a first plastic part 2, a second plastic part 3 and an injection molding fixing structure 4.

[0060] The first plastic part 2 is located outside the cover body 1, and the second plastic part 3 is located inside the cover body 1. A shaping slope 31 is provided on the side of the second plastic part 3 facing away from the cover body 1. The tab extends along the shaping slope 31 through the second plastic part 3, the cover body 1, and the first plastic part 2.

[0061] The cover assembly provided in this embodiment has a tab extending along the shaping slope 31 through the second plastic part 3, the cover body 1 and the first plastic part 2 to be electrically connected to the corresponding pole, so that the tab is connected to the pole outside the cover assembly, avoiding excessive occupation of the space inside the battery, improving the utilization rate of the internal space of the battery, and being beneficial to increasing the energy density of the battery and reducing the size of the battery; moreover, the provision of the shaping slope 31 can improve the shape of the tab, protect the tab, and prevent the tab from short-circuiting due to a poorly folded state.

[0062] The injection molding fixing structure 4 includes an injection molding column 41 and an injection molding cavity 42 that are plugged in together; the first plastic part 2 and the cover body 1 are injection-molded and fixed through the injection molding column 41 and the injection molding cavity 42; and / or, the second plastic part 3 and the cover body 1 are injection-molded and fixed through the injection molding column 41 and the injection molding cavity 42.

[0063] Since the first plastic part 2 and the cover body 1 are fixed by injection molding through the injection molding column 41 and the injection molding cavity 42, and the second plastic part 3 and the cover body 1 are fixed by injection molding through the injection molding column 41 and the injection molding cavity 42, the connection between the first plastic part 2, the second plastic part 3 and the cover body 1 can be achieved at the same time as injection molding, and there is no need to assemble the three later. While ensuring that the second plastic part 3 and the battery top cover are firmly fixed, it can save subsequent assembly steps, improve production efficiency and reduce production costs.

[0064] Specifically in this embodiment, injection molding columns 41 are protruding from both the side of the first plastic part 2 facing the cover body 1 and the side of the second plastic part 3 facing the cover body 1. An injection molding cavity 42 is provided on the cover body 1 corresponding to each injection molding column 41. The cover body 1 is typically made of aluminum, which provides high strength. Providing an injection molding cavity 42 thereon does not significantly weaken its strength. Furthermore, after the first and second plastic parts 2 and 3 are injection-molded and fixed to the cover body 1, injection molding stability is ensured.

[0065] See also Figure 6 and Figure 7 The second plastic part 3 is provided with injection molding columns 41 at both ends and in the middle along the length direction; and at least two injection molding columns 41 are provided along the width direction of the second plastic part 3. The presence of injection molding columns 41 in the middle and at both ends of the second plastic part 3, and at least two injection molding columns 41 along the width direction, can improve the connection strength between the second plastic part 3 and the cover body 1 in the length and width directions after injection molding.

[0066] Furthermore, at least two injection molding columns 41 are provided on the first plastic part 2. For example, after the first plastic part 2 is injection molded, four injection molding columns 41 are formed in a 2×2 array, effectively improving the connection strength between the first plastic part 2 and the cover body 1 after injection molding.

[0067] In this embodiment, the injection cavity 42 is recessed in the cover body 1. That is, the injection cavity 42 is a blind hole structure, not penetrating the cover body 1. On the one hand, it avoids excessive weakening of the cover body 1, and on the other hand, it can prevent the injection material from overflowing during injection molding, thereby improving the injection molding quality.

[0068] like Figure 6 、 Figure 7 、 Figure 8 as well as Figure 10 As shown, a first boss 32 is provided on the side of the second plastic part 3 facing the cover body 1, and a first through hole 33 is provided on the second plastic part 3, the first through hole 33 passes through the first boss 32, and an injection column 41 is provided on the second plastic part 3 and is spaced apart from the first boss 32; a second through hole 11 is provided on the cover body 1, and the first boss 32 is limitedly located in the second through hole 11; the first plastic part 2 is provided with a third through hole 20 opposite to the first through hole 33, and the tab extends out through the first through hole 33 and the third through hole 20.

[0069] The plug-in fit between the first boss 32 and the second through hole 11 further enhances the connection stability between the second plastic component 3 and the cover body 1, while also providing a positioning function between the two. The tab extends along the shaped slope 31 into the first through hole 33 and ultimately extends out of the cover assembly through the third through hole 20.

[0070] like Figure 5 and Figure 10 As shown, along the direction away from the first through hole 33 , the shaping slope 31 gradually extends in a direction away from the cover plate body 1 , so as to perform shaping when the tab is passed through.

[0071] If only a positive electrode or a negative electrode is designed on the cover body 1, the number N of the second through holes 11 is ≥1. If a positive electrode is set on one side of the cover body 1 and a negative electrode is set on one side, the number of the second through holes 11 at the positive electrode side and the negative electrode side is ≥1. After the tab passes through the cover assembly, it is folded over the top of the cover assembly, which can improve the internal space utilization of the battery.

[0072] Alternatively, see Figure 7 and Figure 10The second through hole 11 is a stepped hole. The second through hole 11 includes a first hole structure 111 and a second hole structure 112. The cross-sectional size of the first hole structure 111 is larger than the cross-sectional size of the second hole structure 112. A stepped limiting surface 113 is formed between the first hole structure 111 and the second hole structure 112. The first boss 32 is limited to the first hole structure 111 and contacts the stepped limiting surface 113, which can further improve the stability between the first boss 32 and the second through hole 11, and at the same time make the cover body 1 have higher strength.

[0073] Alternatively, see Figure 6 and Figure 10 The second plastic part 3 is provided with two first bosses 32 along the width direction, and the second plastic part 3 is provided with two material reduction grooves 34 between the two first bosses 32. A support rib 35 is provided between the two material reduction grooves 34. The bottom wall of the material reduction groove 34 has a slope, and the groove depth of the material reduction groove 34 gradually deepens in the direction close to the support rib 35, and the support rib 35 abuts against the cover body 1.

[0074] The provision of the material reduction groove 34 helps to achieve lightweighting of the second plastic part 3 and saves the material required for making the second plastic part 3. A shaping slope 31 is formed on the back of the material reduction groove 34, and the bottom wall of the material reduction groove 34 is inclined in the same direction as the shaping slope 31.

[0075] Since the support ribs 35 are against the cover body 1 , the overhang between the second plastic part 3 and the cover body 1 can be reduced, thereby improving the deformation resistance of the entire cover assembly in the thickness direction.

[0076] In this embodiment, Figure 6 As shown, the first plastic part 2 includes a first plastic plate 21, and a second boss 22 is protruded on the side of the first plastic plate 21 facing away from the cover body 1. The third through hole 20 passes through the second boss 22. The setting of the second boss 22 can reinforce the part where the third through hole 20 is set on the first plastic part 2, thereby reducing the deformation of the first plastic part 2.

[0077] like Figure 10 As shown, the distance L1 between the outer contour of the second boss 22 and the outer contour of the first plastic plate 21 is greater than or equal to 0 mm and less than or equal to 10 mm. The distance L1 should not be too large. If it is too large, the weight of the first plastic part 2 and the required materials will increase, resulting in an increase in the overall cost and weight of the cover assembly, which is not conducive to lightweight and miniaturized design.

[0078] See also Figure 4 、 Figure 6 and Figure 9 The cover body 1 is provided with a mounting groove 12, and the first plastic part 2 is installed in the mounting groove 12, which can improve the positioning accuracy and stability of the first plastic part 2 after installation, and reduce the thickness of the entire cover assembly to a certain extent.

[0079] like Figure 10 As shown, the upper surface of the first plastic plate 21 is lower than the upper surface of the cover body 1. The distance L2 between the upper surface of the first plastic plate 21 and the upper surface of the cover body 1 is greater than or equal to 0 mm and less than or equal to 0.5H, where H is the thickness of the cover body 1. Distance L2 should not be too large or too small. If distance L2 is too small, it will not improve space utilization. If it is too large, it will lead to low strength of the cover assembly and will not be suitable for use.

[0080] See also Figure 4 、 Figure 6 and Figure 9 The first plastic part 2 has a receiving groove 23 on its side facing away from the cover body 1. This groove 23 is configured to accommodate a connecting piece and / or a terminal post for electrical connection to the tab. The connecting piece is used to connect the tab and the terminal post. The provision of the receiving groove 23 not only facilitates the positioning of the connecting piece and / or the terminal post and improves installation stability, but also helps reduce the thickness of the entire cover assembly.

[0081] like Figure 6 and Figure 7 As shown, the cover body 1 is also equipped with an explosion-proof valve 5 and a liquid injection hole 13. The notch on the explosion-proof valve 5 can face the inside or outside of the cover body 1. The liquid injection hole 13 can be located near the positive electrode side, the negative electrode side, or between the positive and negative electrodes. In other embodiments, the explosion-proof valve 5 and the liquid injection hole 13 can also be omitted from the cover body 1.

[0082] In this embodiment, the first plastic part 2 and the second plastic part 3 may be an integrated structure or a split structure.

[0083] It is understandable that Figure 4 The two first plastic parts 2 are arranged as shown, one of which is at the positive pole position and the other is at the negative pole position.

[0084] This embodiment also provides a battery, comprising a housing, a battery cell, and the aforementioned cover plate assembly, wherein the battery cell is disposed within the housing, and the cover plate assembly is disposed at an opening of the housing. The beneficial effects of the battery having the aforementioned cover plate assembly are as described above.

[0085] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A cover plate assembly, characterized in that: include: Cover plate body (1); A first plastic part (2), the first plastic part (2) being located outside the cover plate body (1); A second plastic part (3), the second plastic part (3) is located on the inner side of the cover plate body (1), a shaping slope (31) is provided on the side of the second plastic part (3) facing away from the cover plate body (1), and the tab extends along the shaping slope (31) through the second plastic part (3), the cover plate body (1) and the first plastic part (2); An injection molding fixing structure (4) comprising an injection molding column (41) and an injection molding cavity (42) that are plug-fitted; The first plastic part (2) and the cover plate body (1) are fixed by injection molding via the injection molding column (41) and the injection molding cavity (42); and / or the second plastic part (3) and the cover plate body (1) are fixed by injection molding via the injection molding column (41) and the injection molding cavity (42).

2. The cover plate assembly according to claim 1, wherein: The injection molding columns (41) are both protrudingly provided on the side of the first plastic part (2) facing the cover plate body (1) and the side of the second plastic part (3) facing the cover plate body (1), and the injection molding cavity (42) is provided on the cover plate body (1) corresponding to each injection molding column (41).

3. The cover plate assembly according to claim 2, wherein: The second plastic part (3) is provided with injection molding columns (41) at both ends and the middle portion along the length direction; And / or, the second plastic part (3) is provided with at least two injection molding columns (41) along the width direction; And / or, at least two injection molding columns (41) are provided on the first plastic part (2).

4. The cover plate assembly according to claim 2, wherein: The injection cavity (42) is recessed and arranged on the cover plate body (1).

5. The cover plate assembly according to claim 1, wherein: A first boss (32) is provided on a side of the second plastic part (3) facing the cover plate body (1), and a first through hole (33) is provided on the second plastic part (3), the first through hole (33) passes through the first boss (32), and the second plastic part (3) is provided with the injection molding column (41) spaced apart from the first boss (32); A second through hole (11) is provided on the cover plate body (1), and the first boss (32) is disposed and confined within the second through hole (11); The first plastic part (2) is provided with a third through hole (20) directly opposite to the first through hole (33), and the tab extends through the first through hole (33) and the third through hole (20).

6. The cover plate assembly according to claim 5, wherein: The second through hole (11) is a stepped hole. The second through hole (11) comprises a first hole structure (111) and a second hole structure (112). The cross-sectional dimension of the first hole structure (111) is larger than the cross-sectional dimension of the second hole structure (112). A stepped limiting surface (113) is formed between the first hole structure (111) and the second hole structure (112). The first boss (32) is positioned through the first hole structure (111) and contacts the stepped limiting surface (113).

7. The cover plate assembly according to claim 5, wherein: The second plastic part (3) is provided with two first bosses (32) along the width direction, and the second plastic part (3) is provided with two material reduction grooves (34) between the two first bosses (32). A supporting rib (35) is provided between the two material reduction grooves (34). The bottom wall of the material reduction groove (34) has a slope, and the groove depth of the material reduction groove (34) gradually deepens in a direction close to the supporting rib (35), and the supporting rib (35) abuts against the cover plate body (1).

8. The cover plate assembly according to claim 5, wherein: The first plastic component (2) comprises a first plastic component plate (21), a second boss (22) is provided on a side of the first plastic component plate (21) facing away from the cover plate body (1), and the third through hole (20) passes through the second boss (22); The distance between the outer contour of the second boss (22) and the outer contour of the first plastic plate (21) is greater than or equal to 0 mm and less than or equal to 10 mm; and / or the distance between the upper surface of the first plastic plate (21) and the upper surface of the cover plate body (1) is greater than or equal to 0 mm and less than or equal to 0.5H; wherein H is the thickness dimension of the cover plate body (1).

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: A receiving groove (23) is provided on a side of the first plastic part (2) facing away from the cover plate body (1), and the receiving groove (23) is configured to accommodate a connecting piece and / or a pole electrically connected to the tab; And / or, the cover plate body (1) is provided with a mounting groove (12), and the first plastic part (2) is mounted in the mounting groove (12).

10. A battery, characterized in that: It comprises a shell, a battery cell and a cover plate assembly as described in any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the cover plate assembly is arranged at the opening of the shell.

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