Thin battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a thin battery cover plate and a battery, and a first skirt edge is formed on the circumferential edge of a first pole hole on a top cover sheet of the thin battery cover plate. And a second skirt edge is formed on the circumferential edge of the second pole hole of the upper plastic part and extends into the first pole hole. And the pole sequentially penetrates through the lower plastic part, the first pole hole and the second pole hole and then is connected with the riveting block. The sealing element is sleeved on the pole, one side of the sealing element is tightly pressed on the pole, and the other side of the sealing element is tightly pressed on the upper plastic part, the top cover plate and the lower plastic part. By arranging the first skirt edge and the second skirt edge, the top cover piece can be thinned, meanwhile, the contact area between the top cover piece and the pole and the upper plastic part is large, and the fixing effect on the pole is good. In addition, due to the fact that the thickness of the top cover piece is greatly reduced, the weight of the top cover piece can be greatly reduced, and the weight reduction effect and the cost reduction effect are obvious. The utility model further provides a battery which comprises the thin battery cover plate.

Description

Technical Field

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

[0002] The battery cover in the prior art generally includes a rivet block, a top cover sheet, an upper plastic part, a lower plastic part and a pole. During assembly, the upper plastic part is embedded in a recessed groove on one side of the top cover sheet, and the rivet block is embedded in a recessed groove on one side of the upper plastic part. The pole is sequentially passed through the lower plastic part, the top cover sheet, the upper plastic part and the rivet block and then riveted with the rivet block, thereby realizing the assembly of the pole and the top cover sheet.

[0003] Since it is necessary to set a sink groove on one side of the top cover sheet, the thickness of the top cover sheet cannot be set too thin. The thickness of the top cover sheet is generally set at about 2mm, so as to ensure that the top cover sheet is not easily deformed when the pole and the rivet block are riveted, and at the same time ensure that the structural strength of the pole and the top cover sheet after assembly is high. However, when adopting the above assembly scheme, on the one hand, each structural part is prone to production defects during processing, and there may be unqualified symmetry of the aluminum block, errors in the processing of the sink groove on the top cover sheet, etc., which will cause problems such as cracking of the upper plastic parts and deformation of the top cover sheet during assembly, and the assembly yield is low; on the other hand, the thickness of the top cover sheet is relatively large, which leads to increased costs and an increase in the total weight of the battery cover, which does not conform to the development trend of lightweight battery covers. Utility Model Content

[0004] The utility model aims to provide a thin battery cover plate and a battery, which can greatly reduce the weight of the top cover plate, have obvious weight reduction and cost reduction effects, and have a simple assembly structure, a high assembly yield, and are easy to process.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In one aspect, the utility model provides a thin battery cover, comprising:

[0007] A top cover sheet, wherein a first pole hole is provided on the top cover sheet, and a circumferential edge of the first pole hole extends to one side to form a first skirt;

[0008] An upper plastic part is arranged on one side of the top cover sheet, and a second pole hole is provided on the upper plastic part, and a circumferential edge of the second pole hole extends toward the side where the first skirt is located to form a second skirt, and the second skirt extends into the first pole hole and is located on the inner side of the first skirt;

[0009] A lower plastic part is arranged on a side of the top cover sheet away from the upper plastic part, and a third pole hole is provided on the lower plastic part;

[0010] The riveting block is arranged on the side of the upper plastic part facing away from the lower plastic part, and a fourth pole hole is provided on the riveting block;

[0011] The pole passes through the third pole hole, the first pole hole, the second pole hole, and the fourth pole hole in sequence and then is connected to the riveting block;

[0012] The seal is sleeved on the pole, one side of the seal is pressed against the pole, and the other side of the seal is pressed against the upper plastic part, the top cover sheet, and / or the lower plastic part.

[0013] Optionally, the pole includes a base part, a column part, and a connecting part connected in sequence. The base part abuts against the seal, the column part passes through the third pole hole, the first pole hole, and the second pole hole, and the connecting part passes through the fourth pole hole and then is connected to the riveting block.

[0014] Optionally, the first pole hole, the third pole hole, and the second pole hole are all of a first polygon structure, the cross-section of the column part is of a second polygon structure, and the number of sides of the first polygon structure is equal to that of the second polygon structure.

[0015] Optionally, the fourth pole hole is circular, and the cross-section of the connecting part is circular.

[0016] Optionally, along the radial direction of the third pole hole, the circumferential edge of the third pole hole extends towards the side where the base part is located to form a third skirt, and the third skirt abuts against the outer side of the first skirt;

[0017] Or, a first boss is provided on the inner side of the third skirt, and the first boss abuts against the free end of the extension of the first skirt.

[0018] Optionally, the seal includes a first sealing part, the first sealing part is sleeved on the column part, and the two ends of the first sealing part abut against the base part and the free end of the extension of the second skirt respectively along the axial direction of the pole.

[0019] Optionally, the seal further includes a second sealing part, the second sealing part is connected to the outer edge of the first sealing part, and the two ends of the second sealing part abut against the lower plastic part and the base part respectively along the axial direction of the pole.

[0020] Optionally, the thickness d of the top cover sheet is less than 1 mm.

[0021] Optionally, an arc-shaped guiding part is provided at the connection between the first skirt and the top cover sheet.

[0022] On the other hand, the present utility model provides a battery, comprising a housing and the thin battery cover plate in any of the above solutions.

[0023] The beneficial effects of the present utility model are as follows:

[0024] The present utility model provides a thin battery cover plate, comprising a top cover sheet, an upper plastic part, a lower plastic part, a riveting block, a pole column and a seal. Among them, the upper plastic part and the lower plastic part are respectively arranged on both sides of the top cover sheet. The top cover sheet is provided with a first pole column hole, and the circumferential edge of the first pole column hole extends to one side to form a first skirt. The upper plastic part is provided with a second pole column hole, and the circumferential edge of the second pole column hole extends to the side where the first skirt is located to form a second skirt. The second skirt extends into the first pole column hole and is located inside the first skirt. The lower plastic part is provided with a third pole column hole. The riveting block is arranged on the side of the upper plastic part facing away from the lower plastic part, and the riveting block is provided with a fourth pole column hole. During assembly, the pole column sequentially passes through the third pole column hole, the first pole column hole, the second pole column hole and the fourth pole column hole and then is connected to the riveting block. The seal is sleeved on the pole column, and one side of the seal is pressed against the pole column, and the other side of the seal is pressed against the upper plastic part, the top cover sheet and the lower plastic part.

[0025] By providing the first skirt and the second skirt, while thinning the top cover sheet, it can ensure that the contact area between the top cover sheet and the upper plastic part is relatively large, and at the same time, the contact area between the upper plastic part and the pole column is also relatively large, with good fixing effect on the pole column, ensuring that the mechanical strength of the thin battery cover plate after assembly is large enough. The assembly structure of the thin battery cover plate is simple, and the assembly yield is high. Moreover, the structures of the top cover sheet and the upper plastic part are relatively simple and easy to process. In addition, since the thickness of the top cover sheet is greatly thinned, the weight of the top cover sheet can be greatly reduced, and the effects of weight reduction and cost reduction are obvious.

[0026] The present utility model also provides a battery, comprising a housing and the above-mentioned thin battery cover plate. By adopting the thin battery cover plate, the overall weight of the battery can be reduced, making the battery more lightweight. At the same time, the volume of the battery is also reduced, and the energy density is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an exploded view of the thin battery cover plate provided in the embodiment of the present utility model;

[0028] Figure 2 is Figure 1 a partial enlarged view of A in

[0029] Figure 3 is a schematic structural view of the upper plastic part provided in the embodiment of the present utility model;

[0030] Figure 4 is a schematic structural view of the top cover sheet provided in the embodiment of the present utility model;

[0031] Figure 5 It is a schematic structural view of the terminal post provided in the embodiment of the present utility model;

[0032] Figure 6 It is a schematic structural view of the riveting block provided in the embodiment of the present utility model;

[0033] Figure 7 It is a schematic structural view of the seal provided in the embodiment of the present utility model;

[0034] Figure 8 It is a partial sectional view of the thin battery cover plate provided in the embodiment of the present utility model;

[0035] Figure 9 It is a partial sectional view of another thin battery cover plate provided in the embodiment of the present utility model.

[0036] In the figure:

[0037] 100, top cover sheet; 101, first terminal post hole; 102, first skirt; 103, arc-shaped guiding part; 200, upper plastic part; 201, second terminal post hole; 202, second skirt; 300, lower plastic part; 301, third terminal post hole; 302, third skirt; 303, first boss; 400, riveting block; 401, fourth terminal post hole; 402, counterbore; 500, terminal post; 510, base part; 520, column part; 530, connecting part; 531, second boss; 600, seal; 610, first sealing part; 620, second sealing part. Specific embodiments

[0038] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0039] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0042] As Figure 1 and Figure 8 shown, this embodiment provides a thin battery cover plate, which includes a top cover sheet 100, an upper plastic part 200, a lower plastic part 300, a riveting block 400, a pole column 500 and a seal 600.

[0043] Among them, a first pole column hole 101 is provided on the top cover sheet 100, and a first skirt 102 is formed by the circumferential edge of the first pole column hole 101 extending to one side. The upper plastic part 200 is arranged on one side of the top cover sheet 100, and a second pole column hole 201 is provided on the upper plastic part 200. The circumferential edge of the second pole column hole 201 extends to the side where the first skirt 102 is located to form a second skirt 202, and the second skirt 202 extends into the first pole column hole 101 and is located inside the first skirt 102. The lower plastic part 300 is arranged on the side of the top cover sheet 100 away from the upper plastic part 200, and a third pole column hole 301 is provided on the lower plastic part 300. The riveting block 400 is arranged on the side of the upper plastic part 200 away from the lower plastic part 300, and a fourth pole column hole 401 is provided on the riveting block 400. During assembly, the pole column 500 passes through the third pole column hole 301, the first pole column hole 101, the second pole column hole 201 and the fourth pole column hole 401 in sequence and is connected to the riveting block 400 by riveting. The seal 600 is sleeved on the pole column 500, and one side of the seal 600 is pressed against the pole column 500, and the other side of the seal 600 is pressed against the upper plastic part 200, the top cover sheet 100 and the lower plastic part 300.

[0044] After the pole column 500 and the riveting block 400 are riveted, both ends of the pole column 500 tightly press the riveting block 400 and the seal 600 respectively. The pole column 500 assembles the top cover sheet 100, the upper plastic part 200, the lower plastic part 300 and the seal 600 together. Through the upper plastic part 200, the lower plastic part 300 and the seal 600, the top cover sheet 100 can be insulated from the pole column 500. The gap between the pole column 500 and the upper plastic part 200, the lower plastic part 300 and the top cover sheet 100 is sealed by the seal 600.

[0045] Compared with the previous solution of setting more sinking grooves on the top cover sheet 100, the assembly structure of the thin battery cover plate in this embodiment is simple and has a high assembly yield. Moreover, the structures of both the top cover sheet 100 and the upper plastic part 200 are relatively simple and easy to process. Only a first skirt 102 needs to be set circumferentially around the first pole column hole 101 of the top cover sheet 100, and a second skirt 202 needs to be set circumferentially around the second pole column hole 201 of the upper plastic part 200. By setting the first skirt 102 and the second skirt 202, while thinning the top cover sheet 100, it can be ensured that the contact area between the top cover sheet 100 and the upper plastic part 200 is relatively large, and at the same time, the contact area between the upper plastic part 200 and the pole column 500 is also relatively large, with a good fixing effect on the pole column 500, ensuring that the mechanical strength of the thin battery cover plate after assembly is large enough. In addition, when using the assembly structure in this embodiment, the thickness d of the top cover sheet 100 is less than 1 mm. Since the thickness of the top cover sheet 100 is greatly thinned, the weight of the top cover sheet 100 can be greatly reduced, and the effects of weight reduction and cost reduction are obvious.

[0046] See Figure 2 , in this embodiment, an arc-shaped guiding part 103 is provided at the connection between the first skirt 102 and the top cover sheet 100. By providing the arc-shaped guiding part 103, it can play a good guiding role for the second skirt 202, so that the second skirt 202 of the upper plastic part 200 is more easily inserted into the first pole column hole 101 on the top cover sheet 100, and the positioning between the first skirt 102 and the second skirt 202 is accurate.

[0047] In some embodiments, after the pole column 500 and the riveting block 400 are riveted, along the axial direction of the pole column 500 ( Figure 1 the Z-axis direction shown in

[0048] ), the seal 600 will be compressed. In order to ensure good sealing effect of the seal 600, generally, the compression rate of the seal 600 along the axial direction of the pole column 500 needs to be controlled within the range of 30% - 40%. Exemplarily, the compression rate of the seal 600 can be 30%, 35% or 40%. Figure 5 , Figure 6 and Figure 8, the terminal post 500 includes a base portion 510, a column portion 520, and a connection portion 530 that are connected in sequence. The base portion 510 abuts against the seal 600. The column portion 520 passes through the third terminal post hole 301, the first terminal post hole 101, and the second terminal post hole 201. The connection portion 530 passes through the fourth terminal post hole 401 and then connects to the riveting block 400. It should be noted that a counterbore 402 is provided on the riveting block 400. The connection portion 530 passes through the fourth terminal post hole 401. After the connection portion 530 is riveted to the riveting block 400, the connection portion 530 deforms in its radial direction ( Figure 8 the X-axis direction shown in), forming a second boss 531. The second boss 531 abuts against the counterbore 402 of the riveting block 400. Thus, the base portion 510 and the connection portion 530 of the terminal post 500 respectively press against the seal 600 and the riveting block 400, realizing the installation of the terminal post 500 on the top cover sheet 100.

[0049] Continue to refer to Figure 1 , Figures 3 - 5 , the first terminal post hole 101, the third terminal post hole 301, and the second terminal post hole 201 are all of the first polygon structure. The cross-section of the column portion 520 is of the second polygon structure. The number of sides of the first polygon structure is equal to that of the second polygon structure. Exemplarily, both the first polygon structure and the second polygon structure in this embodiment are square. Of course, in other embodiments, both the first polygon structure and the second polygon structure can also be set to pentagon, hexagon, octagon, etc. By adopting the above polygon structure, the terminal post 500 can be prevented from rotating in the first terminal post hole 101, the third terminal post hole 301, and the second terminal post hole 201, ensuring that the terminal post 500 does not rotate during riveting and the assembly yield is relatively high. In addition, this structure also enables accurate positioning after the terminal post 500 and the top cover sheet 100 are assembled, and does not rotate during subsequent use, thereby ensuring reliable connection between the terminal post 500 and the electrode tab of the battery cell, or between the terminal post 500 and the connection piece, and it is not easy to have problems such as virtual connection or open circuit, with high reliability.

[0050] Furthermore, continue to refer to Figure 5 and Figure 6 , in this embodiment, the fourth terminal post hole 401 on the riveting block 400 is circular, and the cross-section of the connection portion 530 is circular. This setting is to make the force exerted by the connection portion 530 on the circumferential direction of the counterbore 402 of the riveting block 400 more uniform when the connection portion 530 is riveted to the riveting block 400, avoiding stress concentration, which may cause deformation of the top cover sheet 100, cracking of the upper plastic part 200, or poor assembly.

[0051] Continue to refer to Figure 1 , Figure 7 and Figure 8 , along the radial direction of the third terminal post hole 301 (i.e., Figure 1in the X-axis direction shown in [Figure], a circumferential edge of the third pole post hole 301 extends towards the side where the base portion 510 is located to form a third skirt 302, and the outer side of the third skirt 302 abuts against the outer side of the first skirt 102. Optionally, a first boss 303 is further provided on the inner side of the third skirt 302 along the radial direction of the third pole post hole 301. Along the axial direction of the third pole post hole 301 (i.e., Figure 1 in the Z-axis direction shown in [Figure]), the first boss 303 abuts against the free end of the first skirt 102 extending along the axial direction of the third pole post hole 301.

[0052] The seal 600 includes a first sealing portion 610. The first sealing portion 610 is sleeved on the column portion 520 of the pole post 500. Along the axial direction of the pole post 500 ( Figure 1 in the Z-axis direction shown in [Figure]), both ends of the first sealing portion 610 respectively abut against the base portion 510 of the pole post 500 and the free end of the second skirt 202 of the upper plastic part 200 extending along the axial direction of the pole post 500. Further, the seal 600 further includes a second sealing portion 620. The second sealing portion 620 is connected to the outer edge of the first sealing portion 610. Along the axial direction of the pole post 500, both ends of the second sealing portion 620 respectively abut against the first boss 303 of the lower plastic part 300 and the base portion 510 of the pole post 500. Thus, there are two insulating structures between the pole post 500 and the top cover plate 100 (both the lower plastic part 300 and the seal 600 are made of insulating materials), and the insulating effect is good.

[0053] Alternatively, referring to Figure 1 、 Figure 7 and Figure 9 , in some other embodiments, the first boss 303 may not be provided on the inner side of the third skirt 302. Along the axial direction of the pole post 500, the free end of the second skirt 202 of the upper plastic part 200 directly abuts against the first sealing portion 610 of the seal 600, the free end of the first skirt 102 of the top cover plate 100 directly abuts against the second sealing portion 620 of the seal 600, and the free end of the third skirt 302 of the lower plastic part 300 directly abuts against the second sealing portion 620 of the seal 600. At this time, the pole post 500 and the top cover plate 100 are insulated by the seal 600. The advantage of this structure is that the structure of the lower plastic part 300 is relatively simple, and the lower plastic part 300 is easy to demold during injection molding.

[0054] This embodiment also provides a battery, including a housing and the above-mentioned thin battery cover plate. By adopting the thin battery cover plate, the overall weight of the battery can be reduced, making the battery lighter. At the same time, the volume of the battery is also reduced, and the energy density is improved.

[0055] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A thin battery cover plate, characterized in that, Comprising: A top cover sheet (100), on which a first pole hole (101) is provided, and a first skirt (102) is formed by extending the circumferential edge of the first pole hole (101) to one side; An upper plastic part (200), arranged on one side of the top cover sheet (100), on which a second pole hole (201) is provided, and a second skirt (202) is formed by extending the circumferential edge of the second pole hole (201) to the side where the first skirt (102) is located. The second skirt (202) extends into the first pole hole (101) and is located inside the first skirt (102); A lower plastic part (300), arranged on the side of the top cover sheet (100) away from the upper plastic part (200), on which a third pole hole (301) is provided; A riveting block (400), arranged on the side of the upper plastic part (200) away from the lower plastic part (300), on which a fourth pole hole (401) is provided; A pole (500), sequentially passing through the third pole hole (301), the first pole hole (101), the second pole hole (201) and the fourth pole hole (401) and then connecting with the riveting block (400); A seal (600), sleeved on the pole (500), and one side of the seal (600) is pressed against the pole (500), and the other side of the seal (600) is pressed against the upper plastic part (200), the top cover sheet (100) and / or the lower plastic part (300).

2. The thin battery cover plate according to claim 1, characterized in that, The pole (500) includes a base part (510), a column part (520) and a connecting part (530) connected in sequence. The base part (510) abuts against the seal (600), the column part (520) passes through the third pole hole (301), the first pole hole (101) and the second pole hole (201), and the connecting part (530) passes through the fourth pole hole (401) and then connects with the riveting block (400).

3. The thin battery cover plate according to claim 2, wherein, The first pole hole (101), the third pole hole (301) and the second pole hole (201) are all of a first polygon structure, and the cross-section of the column part (520) is of a second polygon structure, and the number of sides of the first polygon structure is equal to that of the second polygon structure.

4. The thin battery cover plate according to claim 2, characterized in that The fourth pole hole (401) is circular, and the cross-section of the connecting part (530) is circular.

5. The thin battery cover plate according to claim 2, wherein, Along the radial direction of the third pole hole (301), a third skirt (302) is formed by extending the circumferential edge of the third pole hole (301) to the side where the base part (510) is located, and the third skirt (302) abuts against the outside of the first skirt (102); Or, a first boss (303) is provided inside the third skirt (302), and the first boss (303) abuts against the free end of the extension of the first skirt (102).

6. The thin battery cover plate according to claim 2, wherein The seal (600) includes a first sealing portion (610) sleeved on the column portion (520), and two ends of the first sealing portion (610) in the axial direction of the terminal post (500) respectively abut against the base portion (510) and the free end of the second skirt (202) extending along the axial direction of the terminal post (500).

7. The thin battery cover plate according to claim 6, characterized in that The seal (600) further includes a second sealing portion (620) connected to the outer edge of the first sealing portion (610), and two ends of the second sealing portion (620) in the axial direction of the terminal post (500) respectively abut against the lower plastic part (300) and the base portion (510).

8. The thin battery cover plate according to any one of claims 1-7, characterized in that, The thickness d of the top cover sheet (100) is less than 1 mm.

9. The thin battery cover plate according to any one of claims 1-7, characterized in that An arc-shaped guiding portion (103) is provided at the connection between the first skirt (102) and the top cover sheet (100).

10. A battery, characterized in that, It includes a housing and the thin battery cover plate according to any one of claims 1-9.

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