Cover plate assembly of battery and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly of a battery and the battery, the cover plate assembly of the battery comprises a plate body, a pole mounting hole is formed along a first direction in a penetrating manner, and a first protruding part is formed on the plate body along the circumferential direction of the pole mounting hole; a second protruding part is also formed around the circumferential direction of the pole mounting hole; the polar column is arranged on the plate body, a step part is formed on the circumferential edge of the polar column, and the step part is located between the first protruding part and the second protruding part in the first direction; the insulating part is arranged between the plate body and the pole; the second protruding part is suitable for pressing the insulating part and the pole to the first protruding part; the insulating tail end of the insulating part is one end, close to the first protruding part, of the insulating part in the first direction; and the projection of the insulating tail end along the first direction is not overlapped with the step part. According to the cover plate assembly of the battery provided by the utility model, the insulating part can be prevented from being subjected to larger extrusion force, and the risk that the insulating part is extruded to deform is reduced.

Description

Technical Field

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

[0002] Batteries are typically equipped with a cover plate, which includes a cover plate body, terminals mounted on the cover plate body, and an insulating component between the terminals and the cover plate body. This serves to prevent short circuits and improve safety.

[0003] In related technologies, when installing the terminal post to the cover plate body, riveting is usually used. During the riveting process, the insulating parts are relatively brittle, which makes them prone to deformation and cracking under pressure. This can cause gaps between the cover plate body and the terminal post, resulting in insulation failure and potentially leading to a short circuit in the battery. Utility Model Content

[0004] In view of this, the present invention provides a battery cover assembly and a battery to solve the problem that insulating components are prone to deformation and cracking when subjected to pressure.

[0005] In a first aspect, this utility model provides a battery cover assembly, comprising:

[0006] The plate body has a pole mounting hole formed through it along a first direction, and a first protrusion is formed around the pole mounting hole along the circumference of the plate body; and a second protrusion is also formed around the pole mounting hole along the circumference of the plate body, the second protrusion being located on the side of the first protrusion away from the pole mounting hole along a second direction; the second direction is perpendicular to the first direction.

[0007] The pole is disposed on the plate body, and a stepped portion is formed on the circumferential edge of the pole. The stepped portion is located between the first protrusion and the second protrusion in the first direction.

[0008] An insulating component is disposed between the plate body and the pole post;

[0009] The second protrusion is adapted to press the insulating element and the pole post together to the first protrusion;

[0010] The insulating member has an insulating head end and an insulating end end at its two ends along the first direction, respectively. The insulating end end is the end of the insulating member that is close to the first protrusion along the first direction. The projection of the insulating end end along the first direction does not overlap with the step portion.

[0011] Beneficial Effects: While the insulating component, located between the plate body and the terminal post, ensures electrical insulation between them, its brittle nature makes it prone to deformation and cracking under pressure, leading to gaps between the cover plate body and the terminal post, and ultimately, insulation failure. This embodiment addresses this by ensuring that the projection of the insulating end along the first direction does not overlap with the stepped portion. This prevents the insulating end from appearing in the area between the lower surface of the stepped portion of the terminal post along the first direction and the upper surface of the first protrusion of the plate body. During riveting, this reduces the pressure on the insulating component from the terminal post and the plate body, preventing excessive compressive force and minimizing the risk of deformation. This ensures the insulating component is less prone to deformation and cracking during riveting, effectively preventing insulation failure due to deformation under pressure during assembly. This ensures reliable insulation performance between the terminal post and the plate body, reduces the risk of battery short circuits, and guarantees battery safety.

[0012] Secondly, this utility model also provides a battery, comprising: a casing; and a battery cell;

[0013] And the battery cover assembly as described above;

[0014] The casing has a partial opening, and the battery cover assembly is located at the opening of the casing. The casing and the battery cover assembly enclose a receiving space, and the battery cell is located within the receiving space.

[0015] Since the battery includes a cover assembly, which has the same effect as the cover assembly, it will not be elaborated further here. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery of this utility model;

[0018] Figure 2 This is a top view of the cover plate assembly of the battery of this utility model;

[0019] Figure 3 for Figure 2 Schematic diagram of section AA;

[0020] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0021] Figure 5This is a schematic diagram showing the disassembled state of the pole post and plate body of this utility model;

[0022] Figure 6 This is an enlarged view of the pole, sealing element, and first type of insulating element of this utility model;

[0023] Figure 7 This is an enlarged view of the pole, sealing element, and second type of insulating element of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Cover plate assembly; 2. Housing;

[0026] 10. Plate body; 101. Second protrusion; 102. Pole post mounting hole; 103. First protrusion;

[0027] 11. Pole post; 111. Stepped section;

[0028] 12. Sealing components;

[0029] 13. Insulating component; 131. Insulating start end; 132. Insulating end; 1321. Plane; 1322. Inclined surface. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] Batteries are typically equipped with a cover plate, which includes a cover plate body, terminals mounted on the cover plate body, and an insulating component between the terminals and the cover plate body. This serves to prevent short circuits and improve safety.

[0035] In related technologies, the cover plate body has pole mounting holes. During installation, the pole needs to be placed in the pole mounting holes of the cover plate body first. The pole forms a stepped structure, and the stepped structure of the pole overlaps with the circumferential edge of the cover plate body surrounding the pole mounting holes. By extending a flange structure on the cover plate body and using a riveting device to fold the flange structure, the pole is constrained in the position of the pole mounting holes.

[0036] However, a portion of the insulating component is located between the lower surface of the stepped structure of the terminal and the upper surface of the overlapping portion of the cover body. When installing the terminal to the cover body, a riveting method is typically used. During riveting, this area of ​​the insulating component is subjected to significant compressive force from the cover body and the terminal. The insulating component is relatively brittle, making it prone to deformation and cracking under pressure. This can create gaps between the cover body and the terminal, leading to insulation failure and potentially causing a short circuit in the battery.

[0037] The battery cover assembly provided in the embodiments of this utility model optimizes the structure of the insulating component, ensuring that it is not easily deformed or cracked during the riveting process, effectively avoiding gaps between the cover body and the terminal post, thereby improving the insulation effect, reducing the risk of battery short circuit, and ensuring battery safety.

[0038] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0039] According to an embodiment of the present invention, in one aspect, a battery cover assembly 1 is provided, comprising:

[0040] The plate body 10 has a pole mounting hole 102 formed through it along a first direction. A first protrusion 103 is formed around the pole mounting hole 102 in the circumferential direction. A second protrusion 101 is also formed around the pole mounting hole 102 in the circumferential direction. The second protrusion 101 is located on the side of the first protrusion 103 away from the pole mounting hole 102 along a second direction. The second direction is perpendicular to the first direction.

[0041] The pole post 11 is disposed on the plate body 10. A stepped portion 111 is formed on the circumferential edge of the pole post 11. The stepped portion 111 is located between the first protrusion 103 and the second protrusion 101 in the first direction.

[0042] Insulating component 13 is disposed between plate body 10 and pole post 11;

[0043] The second protrusion 101 is adapted to press the insulating member 13 and the pole post 11 against the first protrusion 103;

[0044] The insulating member 13 has an insulating head end 131 and an insulating end end 132 formed at both ends along the first direction. The insulating end end 132 is the end of the insulating member 13 that is close to the first protrusion 103 along the first direction. The projection of the insulating end end 132 along the first direction does not overlap with the step portion 111.

[0045] It needs to be explained that, in combination Figure 4 , Figure 5 As shown, the first direction refers to the direction perpendicular to the plane where the plate body 10 is located; the second direction refers to the direction parallel to the plane where the plate body 10 is located, which can specifically be the length direction of the plate body 10.

[0046] In this embodiment, the plate body 10 has a through-hole 102 for mounting poles along the first direction, which facilitates the insertion of at least a portion of the pole 11 into the pole mounting hole 102. The plate body 10 also has a first protrusion 103 around the pole mounting hole 102 in the circumferential direction, and a step 111 is formed on the circumferential edge of the pole 11. When the pole 11 is assembled with the plate body 10, the step 111 formed on the circumferential edge of the pole 11 abuts against the first protrusion 103 in the first direction, thereby limiting the position of one side surface of the pole 11.

[0047] The plate body 10 also has a second protrusion 101, which surrounds the outer periphery of the pole mounting hole 102, and a first protrusion 103 is formed in the area between the second protrusion 101 and the pole mounting hole 102 along the second direction.

[0048] In its initial state, the second protrusion 101 extends along a first direction. After the pole post 11 is placed into the pole post mounting hole 102, such that the stepped portion 111 abuts against the first protrusion 103, the second protrusion 101 can be folded towards the pole post mounting hole 102 using a riveting device. Subsequently, the pole post 11 can be pressed and installed between the first protrusion 103 and the second protrusion 101.

[0049] In this embodiment, the insulating element 13 is disposed between the plate body 10 and the terminal post 11, which ensures electrical insulation between the terminal post 11 and the plate body 10. However, because the insulating element 13 is relatively brittle, it is prone to deformation and cracking under pressure, resulting in gaps between the cover plate body and the terminal post, causing insulation failure. This embodiment avoids the insulating end 132 appearing in the area between the lower surface of the step portion 111 of the terminal post along the first direction and the upper surface of the first protrusion 103 of the plate body 10 by limiting the projection of the insulating end 132 along the first direction to not overlap with the step portion 111. This reduces the pressure on the insulating element 13 from the terminal post 11 and the plate body 10 during riveting, avoids excessive compressive force on the insulating element 13, reduces the risk of deformation of the insulating element 13, and ensures that the insulating element 13 is not easily deformed and cracked during riveting. This effectively avoids the insulation failure problem caused by the deformation of the insulating element 13 under pressure during assembly, ensures reliable insulation performance between the terminal post 11 and the plate body 10, reduces the risk of battery short circuit, and ensures battery safety.

[0050] In some embodiments, the insulating end 132 is located along the second direction between the side of the stepped portion 111 and the second protrusion 101.

[0051] By defining the insulating end 132 as located between the side of the stepped portion 111 and the second protrusion 101 along the second direction, it ensures that the insulating component 13 is positioned between the plate body 10 and the terminal post 11, providing good insulation. Simultaneously, it prevents the insulating end 132 from appearing in the area between the lower surface of the stepped portion 111 along the first direction and the upper surface of the first protrusion 103 of the plate body 10. This optimizes the stress distribution on the insulating component 13, effectively preventing deformation due to compression during assembly and avoiding excessive compression of the insulating end 132 during riveting. This ensures its integrity during assembly, further improving the stability and reliability of the insulating component, extending its service life, and enhancing the overall durability of the battery, thereby guaranteeing the overall safety performance of the battery.

[0052] In some embodiments, the battery cover assembly 1 further includes a seal 12, which is disposed at least between the step portion 111 and the first protrusion 103.

[0053] The battery cover assembly 1 in this embodiment also includes a sealing element 12. Since both the terminal post 11 and the plate body 10 can be made of conductive materials and have opposite charges, it is necessary to avoid contact between the terminal post 11 and the plate body 10. Furthermore, since the position where the terminal post 11 is installed on the plate body 10 has a terminal post mounting hole 102, after the terminal post 11 is installed into the terminal post mounting hole 102, in order to prevent electrolyte from flowing out from the gap between the two, it is necessary to ensure good sealing between the terminal post 11 and the plate body 10.

[0054] During the installation process, the sealing element 12, the pole post 11, and the insulating element 13 can be placed sequentially into the pole post mounting hole 102, so that the first protrusion 103 supports both the sealing element 12 and the pole post 11. Then, the second protrusion 101 is folded towards the pole post mounting hole 102, so that the insulating element 13, the pole post 11, and the sealing element 12 can be pressed tightly between the first protrusion 103 and the second protrusion 101.

[0055] By adopting a form in which the projection of the insulating end 132 along the first direction does not overlap with the step portion 111, more space can be provided for the seal 12, reducing the installation difficulty of the seal 12, ensuring its tight fit, and preventing the seal 12 from being squeezed and deformed during assembly. This allows the seal 12 to effectively fill the gap between the step portion 111 and the first protrusion 103, thereby improving the sealing effect.

[0056] In addition, the sealing element 12 and the insulating element 13 can be made of different materials. In this embodiment, the sealing element 12 has greater elasticity and is not easily cracked when squeezed by the plate body 10 and the terminal post 11, which can avoid insulation failure, ensure the stability of the internal environment of the battery, and reduce the risk of leakage.

[0057] In some embodiments, the sealing element 12 and the insulating element 13 are spaced apart.

[0058] The sealing element 12 and the insulating element 13 are spaced apart and do not contact each other, for example Figure 7 The structure shown avoids the pressure of the sealing element 12 on the insulating element 13, further preventing the insulating element 13 from cracking or deforming, and ensuring that it can maintain good insulation performance during long-term use.

[0059] By precisely controlling the position of the insulating end 132, it is ensured that it is not excessively squeezed during the riveting process, which not only maintains the integrity of the insulating component, but also improves the long-term stability of the battery and effectively reduces the risk of battery short circuit caused by insulation failure.

[0060] In some other embodiments, the seal 12 is disposed in contact with the insulator 13.

[0061] Combination Figure 6As shown, the seal 12 partially covers the insulator 13, which can better ensure the insulation effect between the plate body 10 and the pole 11. At this time, the dimensional accuracy of the seal 12 and the insulator 13 needs to be precisely matched to ensure that the seal 12 covers the insulator 13 seamlessly.

[0062] In some embodiments, combined with Figure 6 As shown, the end face of the insulating end 132 along the first direction is a plane 1321 parallel to the second direction.

[0063] By constructing the end face of the insulating end 132 along the first direction as a plane 1321 parallel to the second direction, a better connection between the seal 12 and the insulating element 13 is ensured, gaps caused by uneven end faces are reduced, sealing performance is further improved, and the risk of insulation failure between the plate body 10 and the pole post 11 is reduced.

[0064] In some embodiments, combined with Figure 7 As shown, the end face of the insulating end 132 along the first direction is an inclined surface 1322 at an angle to the second direction.

[0065] By constructing the end face of the insulating end 132 along the first direction as a bevel 1322, more space can be provided for the free extension of the seal 12 when it is compressed, so that the insulating element 13 is subjected to less compressive force from the seal 12, which can better prevent the insulating element 13 from cracking. At the same time, the pressure on the seal 12 can be more effectively dispersed, reducing local stress concentration, further improving the sealing effect, and ensuring the long-term stability and insulation performance between the plate body 10 and the pole post 11.

[0066] In some embodiments, combined with Figure 7 As shown, the angle between the inclined plane 1322 and the second direction is β, which satisfies: 20°≤β≤80°.

[0067] When the angle β between the inclined plane 1322 and the second direction is too small, the inclined plane 1322 becomes more inclined, increasing the extension space of the seal 12. However, this can easily lead to poor sealing, making the connection between the seal 12 and the insulator 13 prone to insulation failure. When the angle β between the inclined plane 1322 and the second direction is too large, the inclined plane 1322 becomes more gentle, limiting the extension space of the seal 12 and enhancing the sealing effect. However, this can easily cause excessive pressure on the insulator 13, resulting in local stress concentration and increasing the risk of cracking. Therefore, a reasonable selection of the angle β range can ensure the effective extension of the seal 12 while avoiding excessive pressure on the insulator 13. This improves the sealing performance while ensuring the long-term stability of the insulator 13 and the reliability of the overall structure. By precisely controlling the angle β, a balance between sealing and insulation is achieved.

[0068] For example, in this embodiment, the value of β can be 20°, 30°, 35°, 40°, 45°, 50°, 60°, 70°, or 80°, or it can be a range formed by any two of the above values. In specific implementations, the optimal value of the included angle β needs to be verified through multiple tests in combination with the actual application environment to ensure that excellent sealing and insulation effects can be maintained under different working conditions.

[0069] In some embodiments, the elastic modulus of the insulating element 13 is k, which satisfies: 400MPa≤k≤22GPa.

[0070] The elastic modulus is a measure of an object's ability to resist elastic deformation. When the elastic modulus of the insulating component 13 is too large, the insulating component 13 becomes too brittle and is prone to cracking, leading to sealing failure. Conversely, when the elastic modulus of the insulating component 13 is too small, the insulating component 13 is prone to deformation and can be squeezed out of the area between the plate body 10 and the pole post 11, posing a significant risk of insulation failure.

[0071] By rationally selecting the elastic modulus k, it is ensured that the insulating component 13 has sufficient flexibility to cope with extrusion and reduce stress concentration caused by excessive rigidity; at the same time, it does not lose the necessary rigidity to maintain structural stability and ensure that it is not easily deformed under pressure. Thus, while improving the sealing performance, the risk of cracking and insulation failure is minimized.

[0072] In one implementation, the insulating element 13 can be made of polypropylene, in which case the elastic modulus k of the insulating element 13 can range from 1.2 GPa to 1.6 GPa. In another implementation, the insulating element 13 can be made of polyethylene, in which case the elastic modulus k of the insulating element 13 can range from 0.4 GPa to 1.2 GPa.

[0073] For example, in this embodiment, the value of k can be 400MPa or 800MPa or 1GPa or 1.2GPa or 1.5GPa or 1.8GPa or 2GPa or 3GPa or 5GPa or 10GPa or 15GPa or 20GPa or 22GPa, or it can be any range formed by any two of the above values.

[0074] In some embodiments, the thickness of the insulating element 13 is h, which satisfies: 0.2mm≤h≤2mm.

[0075] If the thickness h of the insulating component 13 is too small, the insulation performance is poor, and the current can easily break down the insulating component 13, causing insulation failure. Conversely, if the thickness h of the insulating component 13 is too large, although the insulation performance can be improved, a larger space is required between the plate body 10 and the pole post 11 to accommodate the insulating component 13. This results in a greater impact from cracking of the insulating component 13, making it easier for gaps to appear between the plate body 10 and the pole post 11, leading to insulation failure. It may even cause uneven stress on the sealing component 12, increasing local stress concentration and reducing the sealing effect.

[0076] For example, in this embodiment, the value of h can be 0.2mm or 0.5mm or 0.8mm or 1mm or 1.5mm or 1.8mm or 2mm, or it can be a range formed by any two of the above values.

[0077] In some embodiments, on a plane perpendicular to the first direction, the overlap area of ​​the second protrusion 101 and the insulating member 13 is s, satisfying: 40mm. 2 ≤s≤340mm 2 .

[0078] When the overlap area s between the second protrusion 101 and the insulating member 13 is too small, the insulating member 13 will bear a large pressure and is prone to cracking; when the overlap area s between the second protrusion 101 and the insulating member 13 is too large, the second protrusion 101 will cover a large area of ​​the pole post 11, resulting in a small area on the upper surface of the pole post 11, which will affect the welding area with the busbar and thus affect the current flow of the pole post and the busbar.

[0079] For example, in this embodiment, the value of s can be 40mm. 2 Or 100mm 2 Or 150mm 2 Or 200mm 2 Or 340mm 2 "etc." can also be the range formed by any two of the above values.

[0080] According to an embodiment of the present invention, another aspect provides a battery comprising:

[0081] Casing 2;

[0082] Battery cell;

[0083] And the battery cover assembly as described above;

[0084] The housing 2 has a partial opening, and the battery cover assembly is located at the opening of the housing 2. The housing 2 and the battery cover assembly enclose a receiving space, and the battery cell is located in the receiving space.

[0085] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery cover assembly, characterized in that, include: The plate body (10) has a pole mounting hole (102) formed through it along a first direction. The plate body (10) has a first protrusion (103) formed along the circumference of the pole mounting hole (102). A second protrusion (101) is also formed along the circumference of the pole mounting hole (102). The second protrusion (101) is located on the side of the first protrusion (103) away from the pole mounting hole (102) along a second direction. The second direction is perpendicular to the first direction. A pole post (11) is disposed on the plate body (10). A step portion (111) is formed on the circumferential edge of the pole post (11). The step portion (111) is located between the first protrusion (103) and the second protrusion (101) in the first direction. An insulating component (13) is disposed between the plate body (10) and the pole post (11); The second protrusion (101) is adapted to press the insulating member (13) and the pole post (11) against the first protrusion (103); The insulating member (13) has an insulating head end (131) and an insulating end end (132) at both ends along the first direction. The insulating end end (132) is the end of the insulating member (13) that is close to the first protrusion (103) along the first direction. The projection of the insulating end end (132) along the first direction does not overlap with the stepped portion (111).

2. The battery cover assembly according to claim 1, characterized in that, The insulating end (132) is located along the second direction between the side of the stepped portion (111) and the second protrusion (101).

3. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly also includes a seal (12), which is disposed at least between the stepped portion (111) and the first protrusion (103).

4. The battery cover assembly according to claim 3, characterized in that, The sealing element (12) and the insulating element (13) are spaced apart.

5. The battery cover assembly according to claim 3, characterized in that, The sealing element (12) is disposed in contact with the insulating element (13).

6. The battery cover assembly according to claim 3, characterized in that, The end face of the insulating end (132) along the first direction is a plane (1321) parallel to the second direction.

7. The battery cover assembly according to claim 3, characterized in that, The end face of the insulating end (132) along the first direction is an inclined surface (1322) at an angle to the second direction.

8. The battery cover assembly according to claim 7, characterized in that, The angle between the inclined plane (1322) and the second direction is β, which satisfies: 20°≤β≤80°.

9. The cover assembly of the battery according to any one of claims 1 to 8, characterized in that, The elastic modulus of the insulating component (13) is k, which satisfies: 400MPa≤k≤22GPa.

10. The cover assembly of the battery according to any one of claims 1 to 8, characterized in that, The thickness of the insulating component (13) is h, which satisfies: 0.2mm≤h≤2mm.

11. The cover assembly of the battery according to any one of claims 1 to 8, characterized in that, On a plane perpendicular to the first direction, the overlap area between the second protrusion (101) and the insulating member (13) is s, satisfying: 40mm 2 ≤s≤340mm 2 .

12. A battery, characterized in that, include: Shell (2); Battery cell; And a cover assembly for the battery as described in any one of claims 1 to 11 above; The housing (2) has a partial opening, and the cover plate assembly of the battery is disposed at the opening of the housing (2). The housing (2) and the cover plate assembly of the battery enclose a receiving space, and the battery cell is disposed in the receiving space.

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