Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly which comprises a sealing ring, lower plastic cement, a sealing ring and a top cover piece, the lower plastic cement is provided with a first through hole, the top cover piece is provided with a second through hole, a pole is provided with a pole body part and an annular flange extending in the circumferential direction of the pole body part, and the pole body part penetrates through the first through hole and the second through hole. The cylinder part is sleeved with the sealing ring, the sealing ring is arranged between the annular flange and the top cover piece, the sealing ring is composed of an outer ring and a turnover inner ring, the thickness of the outer ring is larger than that of the turnover inner ring, the outer ring is attached to the surface of the annular flange, friction can be reduced through the arrangement of the turnover inner ring easy to turn over, and therefore the resistance during installation is reduced; and the whole sealing ring is prevented from turning over due to friction force when the sealing ring is mounted. In addition, the utility model also discloses a battery comprising the top cover assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a top cap subassembly and battery. BACKGROUND

[0002] New energy market competition is increasingly fierce, and enterprises gradually improve the requirement to the manufacturing process and cost of battery cell. As an important component of battery cell, the airtightness of top cap directly affects the safety of the battery cell. The existing sealing ring structure is generally regular annular structure. In the manufacturing process of top cap, the sealing ring and the pole are generally interference fit. The installation process of the sealing ring is easy to cause the flanging of the sealing ring, thereby causing the sealing property of the top cap to fail in the use process.

[0003] The existing solution is to manually check the installed sealing ring and screen out the sealing ring with flanging. However, this method is low in efficiency and high in cost, and it is difficult to ensure that all the flanged sealing rings are found.

[0004] Therefore, there is an urgent need to invent a top cap subassembly. UTILITY MODEL CONTENT

[0005] One of the purposes of the utility model is to provide a top cap subassembly to reduce the resistance of the sealing ring during installation and prevent the flanging effect.

[0006] To solve the above technical problems, the application adopts the following technical scheme:

[0007] A top cap subassembly is provided, which comprises a sealing ring, a lower plastic, a pole and a top cap sheet. The lower plastic has a first through hole. The top cap sheet has a second through hole. The pole has a columnar portion and an annular flange extending along the circumference of the columnar portion. The columnar portion is arranged in the first through hole and the second through hole. The sealing ring is sleeved on the columnar portion and arranged between the annular flange and the top cap sheet. The sealing ring is composed of an outer ring and a folded inner ring. The thickness of the outer ring is greater than that of the folded inner ring. The outer ring is in surface contact with the annular flange.

[0008] Specifically, the folded inner ring is provided with a notch.

[0009] Specifically, the folded inner ring forms a toothed structure through the notch.

[0010] Specifically, the teeth of the toothed structure are triangular or trapezoidal.

[0011] Specifically, the diameter of the inscribed circle of the folded inner ring is less than or equal to the diameter of the columnar portion.

[0012] Specifically, the lower plastic, the pole and the top cover sheet abut to form a cavity extending along the radial and axial direction of the sealing ring.

[0013] Specifically, the material of the sealing ring is rubber.

[0014] Specifically, the cross section of the outer ring along the thickness direction is square.

[0015] Specifically, the thickness of the folded inner ring is less than 2 / 3 of the thickness of the outer ring.

[0016] The beneficial effects of the utility model lie in: the sealing ring is divided into an outer ring and a folded inner ring, the folded inner ring is arranged to have a smaller thickness, the folded inner ring is more likely to deform compared with the outer ring, the folding of the folded inner ring significantly reduces the resistance of the sealing ring during installation when the sealing ring is installed, and the whole turning over of the sealing ring is prevented.

[0017] The second purpose of the utility model is to provide a battery comprising the top cover assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the utility model, form a part of the utility model, and are used to explain the utility model and do not constitute an improper limitation on the utility model. In the drawings:

[0019] Figure 1 It is a structure schematic view of the top cover assembly;

[0020] Figure 2 It is a sectional view of the top cover assembly;

[0021] Figure 3 It is Figure 2 the structure enlarged view of A;

[0022] Figure 4 It is a structure schematic view of the sealing ring;

[0023] Figure 5 It is a structure schematic view of the pole;

[0024] Figure 6 It is a structure schematic view of the sealing ring and the pole.

[0025] Wherein: 1-top cover sheet; 2-lower plastic; 3-pole; 31-annular flange; 32-column part; 4-upper plastic; 5-sealing ring; 51-outer ring; 52-folded inner ring; 6-cavity. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described in the embodiments of the present application in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0027] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the claims, and any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application, therefore the protection scope of the present application should be limited by the scope defined by the claims of the present application.

[0029] The top cover is an important component of the battery cell, and its airtightness directly affects the safety of the battery cell, so a sealing ring is arranged at the connection between the top cover and the pole to seal, and in order to improve the positioning and sealing performance between the sealing ring and the pole, the sealing ring and the pole are arranged in interference fit, and the sealing ring in interference fit with the pole has great resistance when being installed to the corresponding position of the pole, so that the sealing ring is prone to edge turning during installation, resulting in sealing failure.

[0030] As shown in Figures 1-5 In the present application, the sealing ring 5 is arranged as an outer ring 51 and a folded inner ring 52, the positioning function and the sealing function of the sealing ring 5 are separated by the arrangement of the outer ring 51 and the folded inner ring 52, the outer ring 51 is responsible for providing good sealing performance, and the folded inner ring 52 reduces the resistance and prevents turning during installation and realizes positioning. Such structure not only improves the reliability of sealing, but also makes the assembly more convenient during installation, thereby improving the overall use efficiency.

[0031] As shown in Figures 1-5As shown, a top cover assembly includes a sealing ring 5, a lower plastic 2, a pole 3 and a top cover sheet 1. The lower plastic 2 has a first through hole, the top cover sheet 1 has a second through hole, the pole 3 has a column portion 32 and an annular flange 31 extending along the circumference of the column portion 32, the column portion 32 is passed through the first through hole and the second through hole, the sealing ring 5 is sleeved on the column portion 32 and arranged between the annular flange 31 and the top cover sheet 1, the sealing ring 5 consists of an outer ring 51 and a folded inner ring 52, the thickness of the outer ring 51 is greater than that of the folded inner ring 52, and the outer ring 51 is in contact with the surface of the annular flange 31.

[0032] Exemplarily, the installation method of the top cover assembly is as follows: first, the sealing ring 5 is inserted into the column portion 32 of the pole 3, and the sealing ring 5 is moved so that the bottom of the outer ring 51 is in contact with the surface of the annular flange 31 to keep the sealing ring 5 flat. During the movement of the sealing ring 5, the inner ring 52 is partially folded, and the position where the inner ring 52 contacts the column portion 32 will be deformed or folded due to excessive friction. Since the thickness of the folded inner ring 52 is smaller than that of the outer ring 51, the folded inner ring 52 is more likely to deform, and the stress generated by the deformation of the folded inner ring 52 cannot cause the outer ring 51 to fold, so that the outer ring 51 will not be folded after the sealing ring 5 is installed at the specified position of the pole 3. In this case, after the sealing ring 5 is installed on the pole 3, the pole 3 is passed through the first through hole and the second through hole in sequence, wherein the diameter of the first through hole is larger than the outer diameter of the sealing ring 5, so that the sealing ring 5 can pass through the first through hole smoothly, and the sealing ring 5 and the lower plastic 2 are both in contact with the annular flange 31, and then the top cover sheet 1 is pressed down. When the top cover sheet 1 is pressed down, the lower plastic 2 is fixed so that the lower plastic 2 does not move up and down, and the thickness of the lower plastic 2 also controls the sealing ring 5 to be compressed with an appropriate amount, so that the sealing ring 5 can achieve sealing of the pole 3 and the top cover sheet 1, and then the upper plastic 4 is formed by injection molding to provide continuous downward pressure for the top cover plate.

[0033] Preferably, the thickness of the folded inner ring 52 is less than two-thirds of the thickness of the outer ring 51. This further enhances the flexibility of the folded inner ring 52, making it easier to deform during installation, thereby effectively reducing the installation resistance of the sealing ring 5. At the same time, this proportional design ensures that the outer ring 51 can maintain its original shape and excellent sealing performance when the folded inner ring 52 deforms.

[0034] like Figure 4 As shown, preferably, the foldable inner ring 52 is provided with a notch. This design enhances the flexibility of the foldable inner ring 52 and divides the foldable inner ring 52 into multiple parts, so that the foldable inner ring 52 has different folding degrees for positions with different resistances. After folding to different degrees according to different resistances, the sealing ring 5 can apply horizontal forces in different directions in the radial direction according to the folding degree, thereby effectively keeping the sealing ring 5 in a suitable position, reducing the increase in resistance caused by position deviation, and allowing it to be more easily folded during installation. The presence of the notch further reduces the resistance during installation.

[0035] Preferably, the inner ring 52 is formed into a toothed structure through the notches, further enhancing the stability of the sealing ring 5, making the folding process more smooth, and reducing the resistance during installation.

[0036] Preferably, the number of teeth is greater than 8, which enables the inner ring 52 to be folded in different directions flexibly. Such design not only improves the adaptability of the inner ring 52, but also allows it to accurately adjust the folding degree when facing various resistances, thereby effectively applying horizontal forces in different directions.

[0037] The teeth of the toothed structure can be selected in various shapes, such as trapezoidal, rectangular, and triangular. When the selected shape and the contact area of the pole 3 are larger, the friction between the pole 3 and the sealing ring 5 is larger, but the positioning effect on the sealing ring 5 is better. When the contact area between the sealing ring 5 and the pole 3 is smaller, the deformation is easier and the friction is smaller, but the positioning effect on the sealing ring 5 is poor.

[0038] Preferably, the teeth of the toothed structure are triangular. This shape makes the friction between the sealing ring 5 and the pole 3 smaller, and when the position deviation becomes larger, the contact area between the teeth and the pole 3 becomes larger, and the positioning effect on the sealing ring 5 is better.

[0039] Preferably, the diameter of the inner circle of the inner ring 52 is less than or equal to the diameter of the cylindrical portion 32. The inner ring 52 can closely fit the cylindrical portion 32, thereby improving the stability and positioning effect of the sealing ring 5. In this way, the resistance caused by the position deviation can be effectively reduced, ensuring that the sealing ring 5 always maintains good sealing performance under different working conditions.

[0040] Preferably, the diameter of the outer circle of the inner ring 52 is greater than the diameter of the cylindrical portion 32, preventing the outer ring 51 from being close to the cylindrical portion 32 and being flipped over.

[0041] Preferably, the diameter of the cylindrical portion 32 is the diameter of the inner circle of the inner ring 52 plus 1 / 4 to 3 / 4 of the difference between the diameter of the outer circle of the inner ring 52 and the diameter. Reasonable diameter design can promote the close fitting of the sealing ring 5, improve the sealing performance, and prevent the sealing ring 5 from being flipped over due to excessive friction resistance.

[0042] As shown in Figure 3 Preferably, after the lower plastic 2, the pole 3, and the top cover sheet 1 are connected, a cavity 6 extending in the radial and axial directions of the sealing ring 5 is formed. The existence of the cavity 6 can effectively increase the contact area of the sealing ring 5 and improve the sealing effect. When the upper plastic 4 is injection molded, the cavity 6 can be filled to reduce the risk of leakage.

[0043] Preferably, the sealing ring 5 is made of rubber, which has excellent elasticity and wear resistance, can effectively resist deformation and maintain good sealing performance. Rubber material performs well under different temperature and pressure conditions, suitable for various industrial applications. In addition, the corrosion resistance and chemical resistance of rubber make it stable in many environments, thereby prolonging the service life of the sealing ring 5. The selection of rubber as the material of the sealing ring 5 can ensure that it provides reliable sealing effect and performance in actual application.

[0044] Preferably, the cross section of the outer ring 51 in the thickness direction is square, which can more evenly distribute the pressure applied on the sealing ring 5, reduce local stress concentration, and improve overall stability. The square outer ring 51 can provide a larger contact area, further improve the sealing effect, and prevent leakage. The above description shows and describes several preferred embodiments of the utility model, but as before, it should be understood that the utility model is not limited to the form disclosed herein, should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept disclosed herein by the above teachings or related technical or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the utility model shall be within the protection scope of the claims attached to the utility model.

Claims

1. A cap assembly, characterized by: The top cover assembly comprises a sealing ring (5), a lower plastic (2), a pole (3) and a top cover sheet (1), the lower plastic (2) has a first through hole, the top cover sheet (1) has a second through hole, the pole (3) has a cylindrical part (32) and an annular flange (31) extending along the circumference of the cylindrical part (32), the cylindrical part (32) is arranged in the first through hole and the second through hole, the sealing ring (5) is sleeved on the cylindrical part (32) and arranged between the annular flange (31) and the top cover sheet (1), the sealing ring (5) is composed of an outer ring (51) and a folded inner ring (52), the thickness of the outer ring (51) is greater than that of the folded inner ring (52), and the outer ring (51) is in surface contact with the annular flange (31).

2. The roof assembly of claim 1, wherein: The thickness of the folded inner ring (52) is less than 2 / 3 of the thickness of the outer ring (51).

3. The roof assembly of claim 1, wherein: The folded inner ring (52) is provided with a notch.

4. The roof assembly of claim 3, wherein: The folded inner ring (52) forms a toothed structure through the notch.

5. The roof assembly of claim 4, wherein: The teeth of the toothed structure are triangular or trapezoidal.

6. The roof assembly of claim 2, wherein: The diameter of the inscribed circle of the folded inner ring (52) is less than or equal to the diameter of the cylindrical part (32).

7. The roof assembly of claim 1, wherein: The lower plastic (2), the pole (3) and the top cover sheet (1) abut to form a cavity (6) extending in the radial and axial directions of the sealing ring (5) after being connected.

8. The roof assembly of claim 1, wherein: The material of the sealing ring (5) is rubber.

9. The roof assembly of claim 1, wherein: The cross section of the outer ring (51) in the thickness direction is square.

10. A battery, characterized by: The top cover assembly comprises any one of claims 1-9.

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