Battery cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate assembly and a battery, the cover plate assembly comprises a cover plate body, a first plastic part and a second plastic part, the first plastic part is positioned 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 the side, back to the cover plate body, of the second plastic part, the tabs extend out through the second plastic part, the cover plate body and the first plastic part along the shaping slope, and the utilization rate of the internal space of the battery is increased. At least one of the first plastic part and the second plastic part is provided with a buckle structure, and at least one of the first plastic part and the second plastic part is provided with a clamping cavity. The first plastic part and the second plastic part are in clamping connection through the buckle structure and the clamping cavity, and the cover plate body is clamped and fixed between the first plastic part and the second plastic part after clamping connection, so that the connection stability of the first plastic part, the second plastic part and the cover plate body is effectively improved, and the reliability of the battery is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover 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 passed through 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 rate of the battery shell 1′. Moreover, the tabs located inside the shell 1′ have a poor shape due to space problems, which can easily cause short circuits, resulting in poor battery safety.

[0004] In addition, the positive first plastic part 24′ and the negative first plastic part 25′ are both installed outside the battery top cover 21′, and the second plastic part structure 26′ is installed inside the battery top cover 21′. The connection stability between the positive first plastic part 24′, the negative first plastic part 25′, the battery top cover 21′ and the second plastic part structure 26′ is poor, which reduces the reliability of the battery.

[0005] Therefore, there is an urgent need for a battery cover 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 battery cover assembly and a battery, which can improve the utilization rate of the internal space of the battery, prevent the short circuit problem caused by the poor retraction of the tabs, and improve the connection stability between the plastic part and the battery top cover.

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

[0008] In a first aspect, a battery cover 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] At least one of the first plastic part and the second plastic part is provided with a snap structure, at least one of the first plastic part and the second plastic part is provided with a snap cavity, and the first plastic part and the second plastic part are snapped together through the snap structure and the snap cavity.

[0013] As a preferred solution of the battery cover assembly provided by the present invention, the snap-fitting cavity includes a connected snap-fitting channel and a receiving groove, the snap-fit ​​structure includes at least one elastic snap-fit, the elastic snap-fit ​​includes a connected cantilever and a clamping head, the cantilever is passed through the snap-fitting channel, the clamping head is located in the receiving groove, and is hooked on the cavity wall of the snap-fitting cavity.

[0014] As a preferred solution of the battery cover assembly provided by the present invention, the buckle structure includes two elastic buckles arranged at intervals, and the cantilever arms of the two elastic buckles are provided with the clamping head on one side facing away from each other;

[0015] The accommodating groove and the clamping channel form a stepped groove structure, so that a stepped limiting surface is formed between the accommodating groove and the clamping channel, and the clamping head hook is clamped on the stepped limiting surface.

[0016] As a preferred solution of the battery cover assembly provided by the present invention, the buckle structure includes two elastic buckles arranged at intervals, and the cantilevered arms of the two elastic buckles are provided with the clamping head on one side facing each other;

[0017] The clamping cavity includes two clamping channels, a clamping boss is provided between the two clamping channels, the cantilevers of the two elastic buckles are correspondingly arranged in the two clamping channels, and the clamp head hook is clamped on the clamping boss.

[0018] As a preferred solution of the battery cover assembly provided by the present invention, a first boss is provided on a side of the second plastic part facing the cover body, and a first through hole is provided on the second plastic part, the first through hole passes through the first boss, and the snap structure is provided on the first boss;

[0019] The cover body is provided with a second through hole, and the first boss is limitedly positioned in the second through hole;

[0020] The first plastic part is provided with a third through hole directly facing the first through hole, the tab extends through the first through hole and the third through hole, and the engaging cavity is provided on the hole wall of the third through hole.

[0021] As a preferred solution of the battery cover assembly provided by the present invention, the first plastic part includes a first plastic plate body, a second boss is protruding from the side of the first plastic plate body facing away from the cover body, and the third through hole passes through the second boss.

[0022] As a preferred solution of the battery cover assembly provided by the present invention, 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;

[0023] 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 of the cover body.

[0024] As a preferred solution of the battery cover assembly provided by the present invention, a receiving groove is provided on the 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.

[0025] As a preferred solution of the battery cover assembly provided by the present invention, the cover body is provided with a mounting groove, and the first plastic part is installed in the mounting groove.

[0026] In a second aspect, a battery is provided, comprising a shell, a battery cell, and the battery cover assembly as described above, wherein the battery cell is disposed in the shell, and the battery cover assembly is disposed at an opening of the shell.

[0027] Beneficial effects of the utility model:

[0028] The utility model provides a battery cover assembly and a battery. Since the tabs extend along the shaping bevel through the second plastic part, the cover body and the first plastic part to be electrically connected to the corresponding poles, the tabs are connected to the poles outside the cover 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 provision of the shaping bevel can improve the shape of the tabs and protect the tabs, preventing the tabs from short-circuiting due to a poorly folded state. In addition, the first plastic part and the second plastic part are connected by a snap-fit ​​structure and a snap-fit ​​cavity. After the snap-fit ​​connection, the cover body is clamped between the first plastic part and the second plastic part, effectively improving the connection stability among the first plastic part, the second plastic part and the cover body, thereby improving the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 is a cross-sectional view of a battery in the prior art;

[0031] Figure 2 is a cross-sectional view of a cover assembly of a battery in the prior art;

[0032] Figure 3 is an axonometric view of a cover plate assembly in the prior art;

[0033] Figure 4 It is a first axonometric view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0034] Figure 5 It is a second axonometric view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0035] Figure 6 This is a first exploded schematic diagram of the cover assembly provided in a specific embodiment of the present utility model;

[0036] Figure 7 This is a second exploded schematic diagram of the cover assembly provided in a specific embodiment of the present utility model;

[0037] Figure 8 yes Figure 4 A partial enlarged view of point A in the middle;

[0038] Figure 9 It is a top view of the cover plate assembly provided in a specific embodiment of the present utility model;

[0039] Figure 10 yes Figure 9 Partial cross-sectional view from the CC direction;

[0040] Figure 11 This is a schematic diagram of one of the buckle structures provided in the specific embodiment of the present utility model;

[0041] Figure 12 yes Figure 9 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 12 middle:

[0047] 1. Cover plate body; 2. First plastic part; 3. Second plastic part; 4. Buckle structure; 5. Clamping cavity; 6. Explosion-proof valve;

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

[0049] 20. Third through hole; 21. First plastic plate; 22. Second boss; 23. Accommodation groove;

[0050] 31. shaping slope; 32. first boss; 33. first through hole;

[0051] 41. Elastic buckle;

[0052] 411, cantilever; 412, chuck;

[0053] 51. Snap-fit ​​channel; 52. Accommodating groove; 53. Step limit surface. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] like Figure 4 、 Figure 5 、 Figure 6 as well as Figure 7 As shown, this embodiment provides a battery cover assembly, including a cover body 1, a first plastic part 2 and a second plastic part 3.

[0061] 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. A snap structure 4 is provided on at least one of the first and second plastic parts 2, 3, and a snap cavity 5 is provided on at least one of the first and second plastic parts 2, 3. The snap structure 4 snaps into the snap cavity 5.

[0062] In some embodiments, the snap structure 4 is provided only on the second plastic part 3 , and the snap cavity 5 is provided only on the first plastic part 2 . The first plastic part 2 and the second plastic part 3 are snapped together via the snap structure 4 and the snap cavity 5 .

[0063] In some embodiments, the snap structure 4 is provided only on the first plastic part 2 , and the snap cavity 5 is provided only on the second plastic part 3 . The first plastic part 2 and the second plastic part 3 are snapped together via the snap structure 4 and the snap cavity 5 .

[0064] In some embodiments, a snap structure 4 is provided on both the first plastic part 2 and the second plastic part 3 . Accordingly, a snap cavity 5 is provided at corresponding positions on the first plastic part 2 and the second plastic part 3 . The first plastic part 2 and the second plastic part 3 are snapped together through the snap structure 4 and the snap cavity 5 .

[0065] The above-mentioned engaging cavity 5 can be a groove structure or a hole structure.

[0066] Because the tabs extend along the shaping bevel 31 through the second plastic part 3, the cover body 1, and the first plastic part 2 to electrically connect to the corresponding poles, the tabs are connected to the poles outside the cover assembly, avoiding excessive occupation of space inside the battery, improving the utilization rate of the battery's internal space, and facilitating an increase in the battery's energy density and a reduction in the battery's size. Furthermore, the provision of the shaping bevel 31 can improve the shape of the tabs and protect them, preventing short circuits caused by poorly folded tabs. Furthermore, the first plastic part 2 and the second plastic part 3 are connected by a snap-fit ​​structure 4 and a snap-fit ​​cavity 5. After the snap-fit ​​connection, the cover body 1 is clamped between the first plastic part 2 and the second plastic part 3, effectively improving the connection stability among the first plastic part 2, the second plastic part 3, and the cover body 1, thereby improving the reliability of the battery.

[0067] Alternatively, see Figure 4 and Figure 8The engaging cavity 5 includes a connecting engaging channel 51 and a receiving groove 52. The engaging structure 4 includes at least one elastic engaging buckle 41, which includes a connected cantilever 411 and a clamping head 412. The cantilever 411 passes through the engaging channel 51, and the clamping head 412 is located in the receiving groove 52 and hooks and engages with the wall of the engaging cavity 5. During engagement, the clamping head 412 and the cantilever 411 pass through the engaging channel 51 in sequence. After engagement is completed, the cantilever 411 is located in the engaging channel 51, and the clamping head 412 hooks and engages with the wall of the engaging cavity 5. The presence of the receiving groove 52 can conceal the clamping head 412, preventing it from protruding from the engaging cavity 5 and interfering with other external structures.

[0068] It is understandable that the snap structure 4 can include only one elastic snap 41, that is, a single-clip structure, or two elastic snaps 41, that is, a double-clip structure, or more than two elastic snaps 41, which can be selected according to specific design requirements and is not limited here.

[0069] In some embodiments, such as Figure 8 、 Figure 9 as well as Figure 10 As shown, the snap structure 4 includes two elastic snaps 41 spaced apart, and a clamping head 412 is protruded from the cantilever arms 411 of the two elastic snaps 41 facing away from each other. The receiving groove 52 and the engaging channel 51 of the engaging cavity 5 form a stepped groove structure, so that a stepped limiting surface 53 is formed between the receiving groove 52 and the engaging channel 51, and the clamping head 412 is hooked on the stepped limiting surface 53. More specifically, the receiving groove 52 and the engaging channel 51 form a T-shaped structure. When the two elastic snaps 41 pass through the engaging channel 51, the clamping head 412 slides along the inner wall of the engaging channel 51, causing the cantilever arms 411 to deform. When the clamping head 412 enters the receiving groove 52, the cantilever arms 411 return to their original shape, and the clamping head 412 is hooked on the stepped limiting surface 53.

[0070] In some embodiments, such as Figure 11 As shown, the snap structure 4 includes two elastic snaps 41 spaced apart, and the cantilever arms 411 of the two elastic snaps 41 are provided with a protruding snap head 412 on the sides facing each other. The snap cavity 5 includes two snap channels 51, with a snap boss disposed between the two snap channels 51. The cantilever arms 411 of the two elastic snaps 41 are disposed in a one-to-one correspondence through the two snap channels 51. When the snap head 412 passes through the snap channels 51, it can slide along the snap boss to deform the cantilever arms 411. After the snap head 412 enters the receiving groove 52, the cantilever arms 411 return to their original shape, and the snap head 412 hooks onto the snap boss.

[0071] In this embodiment, see Figure 6 、 Figure 7 as well as Figure 12A 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 a snap structure 4 is provided on the first boss 32; a second through hole 11 is provided on the cover body 1, and the first boss 32 is limited to be 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 through the first through hole 33 and the third through hole 20, and a snap-fit ​​cavity 5 is provided on the hole wall of the third through hole 20.

[0072] The plug-in fit between the first boss 32 and the second through-hole 11 enhances the connection stability between the second plastic component 3 and the cover body 1. The snap-fit ​​structure 4 is specifically disposed on the top surface of the first boss 32. The tab extends along the shaped slope 31 into the first through-hole 33 and ultimately exits the cover assembly through the third through-hole 20. Furthermore, since the engagement cavity 5 is located within the inner wall of the third through-hole 20, there is no need to create an engagement cavity 5 elsewhere in the cover body 1, which improves the strength of the cover body 1.

[0073] like Figure 5 and Figure 12 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.

[0074] 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.

[0075] 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, and the engaging cavity 5 is at least partially located on the second boss 22. The setting of the second boss 22 can reinforce the portion of the first plastic part 2 where the third through hole 20 is set, thereby reducing the deformation of the first plastic part 2.

[0076] like Figure 12 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.

[0077] See also Figure 4 and Figure 6The 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.

[0078] like Figure 12 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.

[0079] See also Figure 4 and Figure 6 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.

[0080] like Figure 6 and Figure 7 As shown, the cover body 1 is also equipped with an explosion-proof valve 6 and a liquid injection hole 13. The notch on the explosion-proof valve 6 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 6 and the liquid injection hole 13 can also be omitted from the cover body 1.

[0081] In this embodiment, the first plastic part 2 and the second plastic part 3 may be an integrated structure or a split structure.

[0082] 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.

[0083] This embodiment also provides a battery comprising a housing, a battery cell, and the battery cover assembly described above. The battery cell is disposed within the housing, and the battery cover assembly is disposed within an opening of the housing. The presence of the battery cover assembly improves internal space utilization within the battery and prevents short circuits caused by improperly retracted tabs. Furthermore, due to the secure connection between the first plastic component 2, the second plastic component 3, and the cover body 1, the battery exhibits high reliability.

[0084] 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 battery cover assembly, characterized in that: include: Cover plate body (1); A first plastic part (2), the first plastic part (2) being located outside the cover 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); At least one of the first plastic part (2) and the second plastic part (3) is provided with a snap-fit ​​structure (4), and at least one of the first plastic part (2) and the second plastic part (3) is provided with a snap-fit ​​cavity (5), and the first plastic part (2) and the second plastic part (3) are snap-fitted via the snap-fit ​​structure (4) and the snap-fit ​​cavity (5).

2. The battery cover assembly according to claim 1, characterized in that: The engaging cavity (5) comprises a connected engaging channel (51) and a receiving groove (52); the snap structure (4) comprises at least one elastic snap (41); the elastic snap (41) comprises a connected cantilever (411) and a clamping head (412); the cantilever (411) is arranged in the engaging channel (51); the clamping head (412) is located in the receiving groove (52) and is hooked to the cavity wall of the engaging cavity (5).

3. The battery cover assembly according to claim 2, characterized in that: The buckle structure (4) comprises two elastic buckles (41) arranged at intervals, and the cantilever arms (411) of the two elastic buckles (41) are provided with the clamping heads (412) on the sides facing away from each other; The accommodating groove (52) and the clamping channel (51) form a stepped groove structure, so that a stepped limiting surface (53) is formed between the accommodating groove (52) and the clamping channel (51), and the clamping head (412) is hooked on the stepped limiting surface (53).

4. The battery cover assembly according to claim 2, characterized in that: The buckle structure (4) comprises two elastic buckles (41) arranged at intervals, and the cantilever arms (411) of the two elastic buckles (41) are provided with the clamping heads (412) on the sides facing each other; The engaging cavity (5) comprises two engaging channels (51), a engaging boss is provided between the two engaging channels (51), the cantilevers (411) of the two elastic buckles (41) are respectively provided through the two engaging channels (51), and the clamping heads (412) are hooked on the engaging boss.

5. The battery cover assembly according to claim 1, characterized in that: A first boss (32) is provided on the 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 buckle structure (4) is provided on the first boss (32); A second through hole (11) is provided on the cover plate body (1), and the first boss (32) is penetrated and confined in the second through hole (11); The first plastic part (2) is provided with a third through hole (20) facing the first through hole (33); the tab extends through the first through hole (33) and the third through hole (20); and the engaging cavity (5) is provided on the hole wall of the third through hole (20).

6. The battery cover assembly according to claim 5, characterized in that: The first plastic component (2) comprises a first plastic component plate (21), a second boss (22) is provided on the 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).

7. The battery cover assembly according to claim 6, characterized in that: 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).

8. The battery cover assembly according to any one of claims 1 to 7, characterized in that: A receiving groove (23) is provided on the 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.

9. The battery cover assembly according to any one of claims 1 to 7, characterized in that: 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 battery cover assembly as described in any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the battery cover assembly is arranged at the opening of the shell.

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