Battery cover and battery

Abstract

This utility model provides a battery cover and a battery. The battery cover includes: a cover body with a mounting hole extending through its thickness; an electrode assembly including a first limiting part, a connecting part, and a second limiting part distributed along its axial direction; the connecting part being disposed in the mounting hole and spaced apart from the inner wall surface of the mounting hole; the cover body being located between the first limiting part and the second limiting part; an insulating film provided between the first limiting part and the cover body, and between the second limiting part and the cover body; the insulating film being clamped and fixed to the cover body by the first limiting part and the second limiting part; and a sealing ring sleeved on the connecting part, with a first end of the sealing ring abutting against the first limiting part and a second end of the sealing ring abutting against the second limiting part.

Description

Technical Field

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

[0002] With the continuous trend towards miniaturization and high performance in portable electronic devices, micro batteries, as key power supply components, face stringent market demands regarding their size, performance, and stability. Currently, the terminals and cover plates of micro batteries are typically joined using thermoforming or riveting techniques. However, thermoforming is susceptible to electrolyte interference, leading to corrosion of the passivation layer and reduced connection reliability, which in turn affects the battery's sealing and lifespan. While riveting improves connection reliability, it usually employs an encapsulation structure to insulate the terminals and cover plate, resulting in a relatively large encapsulation thickness that is difficult to meet the requirements for thinner and lighter designs. Utility Model Content

[0003] This utility model provides a new technical solution for battery cover, which can at least solve the problem that the existing battery cover structure is not conducive to the design of thin and light batteries.

[0004] This utility model also provides a new technical solution for batteries.

[0005] According to a first aspect of the present invention, a battery cover is provided, comprising: a cover body having a mounting hole extending through its thickness; an electrode assembly including a first limiting portion, a connecting portion, and a second limiting portion distributed along its axial direction, the connecting portion being disposed in the mounting hole and spaced apart from the inner wall surface of the mounting hole, the cover body being located between the first limiting portion and the second limiting portion; an insulating film being provided between the first limiting portion and the cover body, and between the second limiting portion and the cover body, the insulating film being clamped and fixed to the cover body by the first limiting portion and the second limiting portion; and a sealing ring being sleeved on the connecting portion, abutting the first end of the sealing ring against the first limiting portion, and abutting the second end of the sealing ring against the second limiting portion.

[0006] Optionally, the insulating film is adhered to the pole assembly or the cover plate body.

[0007] Optionally, the insulating film is bonded to the pole assembly or the cover plate body by a thermosetting adhesive layer.

[0008] Optionally, the insulating film is a PEEK film or a PI film.

[0009] Optionally, the thickness of the insulating film is 0.015 mm to 0.03 mm; and / or, the thickness of the battery cover is 0.45 mm to 0.48 mm.

[0010] Optionally, the cover plate body is clamped and fixed by the pole assembly.

[0011] Optionally, the pole assembly includes: a fixing piece, the fixing piece being formed as the first limiting portion; a pole body, the pole body including a second limiting portion, the connecting portion and a riveting end distributed sequentially along its axial direction; the riveting end abuts against the side of the fixing piece away from the cover plate body, so that the fixing piece and the second limiting portion clamp the insulating film and the cover plate body.

[0012] Optionally, the outer periphery of the connecting portion is provided with a bulge, the bulge abutting against the sealing ring and the fixing piece, and the outer peripheral surface of the sealing ring abutting against the inner wall surface of the mounting hole.

[0013] Optionally, the cover plate body is provided with a plurality of mounting holes, and the pole body includes a plurality of connecting parts; the connecting parts correspond to the mounting holes, each connecting part is fitted with a sealing ring, the first end of each connecting part is located at the same second limiting part, and the second end of each connecting part is provided with a riveting end.

[0014] Optionally, the cover plate body has explosion-proof grooves on one side in its thickness direction.

[0015] According to a second aspect of the present invention, a battery is provided, comprising the battery cover as described in any of the preceding claims.

[0016] According to the present invention, the battery cover utilizes an insulating film as the insulating structure between the terminal assembly and the cover body. Compared with the existing adhesive-coated structure, the insulating film can be designed to be thinner, thereby reducing the overall thickness of the battery cover and facilitating the lightweight design of micro batteries, or effectively increasing battery capacity without reducing battery volume. By setting a sealing ring on the outer periphery of the connection part of the terminal assembly, a good sealing effect can be achieved, and the sealing ring does not increase the overall thickness of the battery cover. Compared with the adhesive-coated structure, it not only helps to reduce the overall thickness of the battery cover but also ensures the reliability of the seal. In addition, in the present invention, the cover body and the insulating film are clamped and fixed by the first and second limiting parts of the terminal assembly. Compared with hot pressing bonding, there is no need to passivate the parts, thus significantly enhancing the reliability of the battery cover connection and facilitating manufacturing.

[0017] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery cover according to an embodiment of the present invention;

[0020] Figure 2 This is a partial structural diagram of a battery cover plate before riveting according to an embodiment of the present invention;

[0021] Figure 3 This is a partial structural diagram of a battery cover plate after riveting, according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the overall structure of a battery cover according to another embodiment of the present invention;

[0023] Figure 5 This is a perspective view of a battery cover according to yet another embodiment of the present invention.

[0024] Figure Labels

[0025] 100. Battery cover;

[0026] 10. Cover plate body; 11. Explosion-proof groove; 20. Pole post assembly; 21. Fixing piece; 22. Pole post body; 221. Connecting part; 222. Second limiting part; 223. Riveted end; 30. Insulating film; 40. Sealing ring. Detailed Implementation

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] The battery cover 100 according to an embodiment of the present utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figures 1 to 5 As shown, the battery cover 100 according to an embodiment of the present utility model includes: a cover body 10, an electrode assembly 20, an insulating film 30, and a sealing ring 40.

[0034] Specifically, the cover plate body 10 is provided with a mounting hole extending through its thickness direction. The pole post assembly 20 includes a first limiting part, a connecting part 221, and a second limiting part 222 distributed along its axial direction. The connecting part 221 is disposed in the mounting hole and spaced apart from the inner wall surface of the mounting hole. The cover plate body 10 is located between the first limiting part and the second limiting part 222. The insulating film 30 is provided between the first limiting part and the cover plate body 10, and between the second limiting part 222 and the cover plate body 10. The insulating film 30 and the cover plate body 10 are clamped and fixed by the first limiting part and the second limiting part 222. The sealing ring 40 is sleeved on the connecting part 221. The first end of the sealing ring 40 abuts against the first limiting part, and the second end of the sealing ring 40 abuts against the second limiting part 222.

[0035] In other words, such as Figures 1 to 3 As shown, the battery cover 100 according to this embodiment of the present invention is mainly used in micro batteries. The battery cover 100 mainly includes a cover body 10 and a terminal assembly 20. The cover body 10 can be made of steel sheet, which has high mechanical strength and can meet the usage requirements of the battery. The cover body 10 has a mounting hole that extends through the thickness direction of the cover body 10. The terminal assembly 20 can be a positive terminal assembly or a negative terminal assembly. The terminal assembly 20 includes a first limiting portion, a connecting portion 221, and a second limiting portion 222 distributed sequentially along its axial direction. The radial dimension of the connecting portion 221 is smaller than the radial dimension of the mounting hole, and the radial dimensions of both the first limiting portion and the second limiting portion 222 are larger than the radial dimension of the mounting hole. The connecting portion 221 is located inside the mounting hole and spaced apart from its inner wall surface. The first limiting portion is located on a first side (e.g., the upper side) of the cover body 10 in its thickness direction, and the second limiting portion 222 is located on a second side (e.g., the lower side) of the cover body 10 in its thickness direction.

[0036] An insulating film 30 is provided between the first limiting part and the first side of the cover plate body 10, which can separate the first limiting part from the cover plate body 10; an insulating film 30 is provided between the second limiting part 222 and the second side of the cover plate body 10, which can separate the second limiting part 222 from the cover plate body 10; thus, insulation between the terminal post assembly 20 and the cover plate body 10 can be achieved by the insulating films 30 provided on both sides of the cover plate body 10. The insulating film 30 is not limited by the manufacturing process, so it can be designed to be thinner, and its thickness is much smaller than that of the traditional encapsulation structure, which is conducive to the lightweight and thin design of the battery cover plate 100.

[0037] In this embodiment, the cover plate body 10 and the insulating films 30 on both sides are clamped and fixed by the first limiting part and the second limiting part 222, and a sealing ring 40 is sleeved on the outer periphery of the connecting part 221. The sealing ring 40 can be a corrosion-resistant rubber ring. The first end of the sealing ring 40 abuts against the first limiting part, and the sealing ring 40 abuts against the second limiting part 222, thereby achieving a reliable seal between the terminal assembly 20 and the cover plate body 10. The sealing ring 40 does not occupy the space of the battery cover plate 100 in its thickness direction, so it does not increase the overall thickness of the battery cover plate 100, and can play a reliable sealing role. In use, even if the electrolyte passes through the insulating film 30 inside the battery cover plate 100, the sealing ring 40 can still play a good sealing role.

[0038] Therefore, according to the battery cover 100 provided in this embodiment, the insulating film 30 is used as the insulating structure between the terminal assembly 20 and the cover body 10. Compared with the existing adhesive structure, the insulating film 30 can be designed to be thinner, which is beneficial to reducing the overall thickness of the battery cover 100, and thus beneficial to the lightweight design of micro batteries, or to effectively increase the battery capacity without reducing the battery volume. By setting a sealing ring 40 on the outer periphery of the connection portion 221 of the terminal assembly 20, a good sealing effect can be achieved, and the sealing ring 40 will not increase the overall thickness of the battery cover 100. Compared with the adhesive structure, it is not only beneficial to reduce the overall thickness of the battery cover 100, but also to ensure the reliability of the seal. In addition, in the battery cover 100 of this utility model, the cover body 10 and the insulating film 30 are clamped and fixed by the first limiting portion and the second limiting portion 222 of the terminal assembly 20. Compared with hot pressing and bonding, there is no need to passivate the parts, so the reliability of the connection and the reliability of the seal of the battery cover 100 can be significantly enhanced, and it is also easy to manufacture.

[0039] In some specific embodiments of this utility model, the insulating film 30 is bonded to the pole assembly 20 or the cover plate body 10.

[0040] In other words, when assembling the battery cover 100, the insulating film 30 can be adhered to the cover body 10 or the corresponding first limiting part or second limiting part 222, thereby preventing the insulating film 30 from shifting during assembly, making assembly more convenient, reducing assembly difficulty, and improving the assembly efficiency of the battery cover 100. At the same time, the above-mentioned bonding method can also effectively block electrolyte and prevent electrolyte penetration.

[0041] According to one embodiment of the present invention, the insulating film 30 is bonded to the pole assembly 20 or the cover plate body 10 by a thermosetting adhesive layer.

[0042] Specifically, when assembling the battery cover 100, thermosetting adhesive can be applied to one side surface of the insulating film 30, and then the insulating film 30 can be bonded to the cover body 10 or the corresponding first limiting part or second limiting part 222 using the thermosetting adhesive. After the thermosetting adhesive cures, a stable thermosetting adhesive layer is formed. This thermosetting adhesive layer has good high temperature resistance and chemical corrosion resistance, and can effectively resist the effects of high temperature and chemical corrosion during battery use, thereby ensuring that the insulating film 30 is firmly and reliably fixed to the terminal assembly 20 or the cover body 10.

[0043] In some specific embodiments of this utility model, the insulating film 30 is a PEEK film or a PI film.

[0044] In other words, the insulating film 30 can be configured as a PEEK (polyetheretherketone) film. PEEK film possesses excellent electrical insulation and mechanical properties, allowing it to be manufactured thinner, thereby further optimizing the lightweight design of the battery cover 100. Furthermore, PEEK film exhibits good high-temperature resistance and chemical corrosion resistance, enabling it to withstand the effects of high-temperature environments and chemical corrosion during battery use, thus ensuring the reliability of the insulating film 30. Simultaneously, PEEK film also possesses inherent flame retardancy, effectively improving battery safety.

[0045] The insulating film 30 can also be configured as a PI (polyimide) film. PI films have excellent electrical insulation and mechanical properties, allowing the insulating film 30 to be manufactured thinner, thereby further optimizing the lightweight design of the battery cover 100. In addition, PI films have excellent high-temperature resistance and chemical corrosion resistance, enabling them to withstand the effects of high-temperature environments and chemical corrosion during battery use, thus ensuring the reliability of the insulating film 30.

[0046] According to one embodiment of the present invention, the thickness of the insulating film 30 is 0.015 mm to 0.03 mm.

[0047] In this embodiment, the insulating film 30 can be a PEEK film, and its thickness can be prepared in the range of 0.015 mm to 0.03 mm, such as 0.015 mm, 0.018 mm, 0.02 mm, 0.025 mm, 0.028 mm, and 0.03 mm. Within this thickness range, the PEEK film can further reduce the overall thickness of the battery cover 100 while ensuring insulation and mechanical properties, thereby better meeting the requirements of micro batteries for lightweight and thin design.

[0048] In some specific embodiments of this utility model, the pole assembly 20 includes: a fixing piece 21, which is formed as the first limiting part; a pole body 22, which includes a second limiting part 222, a connecting part 221, and a riveting end 223 distributed sequentially along its axial direction; the riveting end 223 abuts against the side of the fixing piece 21 away from the cover plate body 10, so that the fixing piece 21 and the second limiting part 222 clamp the insulating film 30 and the cover plate body 10.

[0049] Specifically, such as Figure 3 As shown, the pole assembly 20 mainly includes a fixing plate 21 and a pole body 22. The fixing plate 21 serves as the first limiting part of the pole assembly 20. The pole body 22 may include a second limiting part 222, a connecting part 221, and a riveting end 223 distributed sequentially along its axial direction. The second limiting part 222, the connecting part 221, and the riveting end 223 are integrally formed.

[0050] In other words, the pole body 22 is formed by riveting rivets, that is, the first end of the rivet is formed as the second limiting part 222, and the second end of the rivet is formed as the riveting end 223 after riveting. Specifically, as Figures 1 to 3 As shown, during the assembly of the battery cover 100, the first insulating film 30 is first bonded to the first side surface of the cover body 10, so that it surrounds the outer periphery of the mounting hole; then, the second insulating film 30 is bonded to the second side surface of the cover body 10, so that it also surrounds the outer periphery of the mounting hole; then, the second end of the rivet is passed through the mounting hole on the cover body 10, and a sealing ring 40 is fitted on the rivet to ensure that the sealing ring 40 is located inside the mounting hole; then, the fixing piece 21 is fitted on the second end of the rivet, and finally, the second end of the rivet is riveted by a riveting device to form the riveting end 223, thereby realizing a reliable connection between the terminal assembly 20 and the cover body 10.

[0051] like Figure 3 As shown, in some optional examples of this utility model, the cover plate body 10 is provided with explosion-proof grooves 11 on one side in the thickness direction.

[0052] In this example, the cover body 10 can burst and release pressure from the explosion-proof notch 11, thus eliminating the need for an additional explosion-proof valve and effectively simplifying the structure of the battery cover 100.

[0053] According to one embodiment of the present invention, the outer periphery of the connecting part 221 is provided with a bulge, the bulge abuts against the sealing ring 40 and the fixing piece 21, and the outer peripheral surface of the sealing ring 40 abuts against the inner wall surface of the mounting hole.

[0054] Specifically, during the riveting process, the outer periphery of the rivet (i.e., the connecting part 221) bulges, causing the bulging part to abut against the inner peripheral surface of the fixing piece 21, thereby ensuring the reliability of the connection. At the same time, the bulging part cooperates with the inner wall surface of the mounting hole to clamp the sealing ring 40, causing the inner peripheral surface of the sealing ring 40 to abut against the bulging part, and the outer peripheral surface of the sealing ring 40 to abut against the inner wall surface of the mounting hole, thereby effectively improving the sealing effect of the sealing ring 40.

[0055] In some optional examples of this utility model, the cover plate body 10 is provided with a plurality of mounting holes, and the pole body 22 includes a plurality of connecting portions 221; the connecting portions 221 correspond to the mounting holes, each connecting portion 221 is fitted with a sealing ring 40, the first end of each connecting portion 221 is located at the same second limiting portion 222, and the second end of each connecting portion 221 is provided with a riveting end 223.

[0056] To ensure the reliability of the connection between the pole assembly 20 and the cover plate body 10, if the pole body 22 uses a single connecting part 221, a thicker connecting part 221 is required. However, after the riveting process, the thicker connecting part 221 may experience excessive compression around its surroundings, which may have adverse effects on the insulating film 30, the sealing ring 40, and the cover plate body 10.

[0057] like Figure 4 and Figure 5 As shown, to ensure the reliability of the connection between the terminal assembly 20 and the cover body 10, this example provides multiple connecting portions 221 on one side of the second limiting portion 222. The first ends of the multiple connecting portions 221 are located at the same second limiting portion 222. The cover body 10 has mounting holes corresponding to the multiple connecting portions 221. Each connecting portion 221 is located in the corresponding mounting hole. The second end of each connecting portion 221 is provided with a riveting end 223, and each connecting portion 221 is fitted with a sealing ring 40. The insulating film 30 and the cover body 10 are clamped together by the cooperation of the second limiting portion 222, the fixing piece 21, and the multiple riveting ends 223. While ensuring the reliability of the connection, the multiple connecting portions 221 can be made relatively thin. The thinner connecting portions 221 will not cause excessive compression to the surroundings, thus effectively improving the reliability of the battery cover 100.

[0058] Specifically, the number of connecting parts 221 is 2, 3, 5, and 8, etc. Multiple connecting parts 221 can be spaced apart along the circumference of the cover plate body 10.

[0059] It should be noted that, while ensuring the reliability of the connection between the pole post assembly 20 and the cover plate body 10, the more connection parts 221 are provided, the smaller their diameter can be. This embodiment will not elaborate further.

[0060] In some specific embodiments of this utility model, the thickness of the battery cover 100 is 0.45mm to 0.48mm.

[0061] In other words, by adopting the above structure, the thickness of the battery cover 100 can be controlled between 0.45mm and 0.48mm. Correspondingly, the height of the electrode body 22 ranges from 0.45mm to 0.48mm, for example, 0.45mm, 0.46mm, 0.47mm, and 0.48mm. Specifically, when the thickness of the insulating film 30 is 0.015mm, the thickness of the battery cover 100 is 0.45mm; when the thickness of the insulating film 30 is 0.03mm, the thickness of the battery cover 100 is 0.48mm.

[0062] An embodiment of this utility model also provides a battery, which can be a micro battery, including the battery cover 100 described in any of the above embodiments. Since the battery cover 100 according to the embodiments of this utility model has the above-described technical effects, the battery according to the embodiments of this utility model also has corresponding technical effects, which will not be repeated in this embodiment.

[0063] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0064] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery cover plate, characterized by, include: The cover plate body (10) is provided with a mounting hole that extends through it along its thickness direction; The pole assembly (20) includes a first limiting part, a connecting part (221) and a second limiting part (222) distributed along its axial direction. The connecting part (221) is disposed in the mounting hole and spaced apart from the inner wall surface of the mounting hole. The cover plate body (10) is located between the first limiting part and the second limiting part (222). An insulating film (30) is provided between the first limiting part and the cover plate body (10) and between the second limiting part (222) and the cover plate body (10). The insulating film (30) and the cover plate body (10) are clamped and fixed by the first limiting part and the second limiting part (222). A sealing ring (40) is fitted onto the connecting part (221). The first end of the sealing ring (40) abuts against the first limiting part, and the second end of the sealing ring (40) abuts against the second limiting part (222).

2. The battery cover plate of claim 1, wherein, The insulating film (30) is bonded to the pole assembly (20) or the cover plate body (10).

3. The battery cover plate of claim 2, wherein, The insulating film (30) is bonded to the pole assembly (20) or the cover plate body (10) by a thermosetting adhesive layer.

4. The battery cover plate of claim 1, wherein, The insulating film (30) is a PEEK film or a PI film.

5. The battery cover plate of claim 1, wherein, The thickness of the insulating film (30) is 0.015 mm to 0.03 mm; and / or, The thickness of the battery cover is 0.45mm to 0.48mm.

6. The battery cover plate of claim 1, wherein, The pole assembly (20) includes: A fixing piece (21) is formed as the first limiting part; The pole body (22) includes a second limiting part (222), a connecting part (221), and a riveting end (223) distributed sequentially along its axial direction; The riveting end (223) abuts against the side of the fixing piece (21) away from the cover plate body (10), so that the fixing piece (21) and the second limiting part (222) clamp the insulating film (30) and the cover plate body (10).

7. The battery cover plate of claim 6, wherein, The outer periphery of the connecting part (221) is provided with a bulge, which abuts against the sealing ring (40) and the fixing piece (21), and the outer peripheral surface of the sealing ring (40) abuts against the inner wall surface of the mounting hole.

8. The battery cover plate of claim 6, wherein, The cover plate body (10) is provided with a plurality of mounting holes, and the pole body (22) includes a plurality of connecting parts (221); The connecting part (221) corresponds to the mounting hole. Each connecting part (221) is fitted with the sealing ring (40). The first end of each connecting part (221) is located at the same second limiting part (222). The second end of each connecting part (221) is provided with the riveting end (223).

9. The battery cover plate of claim 1, wherein, The cover plate body (10) has explosion-proof grooves (11) on one side in the thickness direction.

10. A battery, characterized by The battery cover includes any one of claims 1 to 9.

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