Top cover assembly of battery and battery having same

Abstract

A top cover assembly (100) of a battery and a battery having same. The top cover assembly (100) of the battery comprises: a cover body (1), a mounting hole (11) being provided in the cover body (1); an explosion-proof valve (2) arranged in the mounting hole (11) and blocking the mounting hole (11); and a protection structure (3) comprising a protective film (31) and an adhesive layer (32). The protective film (31) is attached to the cover body (1) by means of the adhesive layer (32) and is opposite the mounting hole (11); the adhesive layer (32) extends in the circumferential direction of the mounting hole (11); and the width of the adhesive layer (32) is a, the distance between the outer contour of the adhesive layer (32) and the inner peripheral wall of the mounting hole (11) is b, and a≥b and 0.5 mm≤b≤1.5 mm. In the top cover assembly (100) of the battery, by defining a≥b and 0.5 mm≤b≤1.5 mm, the bonding area between the adhesive layer (32) and the cover body (1) can be ensured, the fitting strength between the protection structure (3) and the cover body (1) can be improved, the reliability and stability of the connection between the protective film (31) and the cover body (1) can be ensured, the protection structure (3) can be prevented from falling off of the cover body (1), and the production costs of the top cover assembly (100) of the battery can be saved on.

Description

Battery top cover assembly and battery having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the Patent Office of China on November 30, 2023, with application number 202323250710.3 and invention name “Top cover assembly of battery and battery having the same”, and the priority to the Chinese patent application filed with the Patent Office of China on November 30, 2023, with application number 202323267700.0 and invention name “Battery end cover structure and battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery top cover assembly and a battery having the same. Background Art

[0004] In existing technology, lithium-ion batteries can generate high-temperature, high-pressure gases during use. If these gases cannot be discharged outside the battery, they can catch fire and cause serious safety accidents. Therefore, battery cover manufacturers often design explosion-proof valves on the cover. If the internal pressure of the battery is too high, the valves automatically open to release the pressure. Currently, a protective patch structure is usually installed on the explosion-proof valve to protect it from dust contamination and electrolyte corrosion. However, the protective patch structure often has a weak bond with the cover, making it prone to falling off.

[0005] At present, lithium-ion batteries are widely used due to their high energy density and excellent cycle performance. In order to meet different application scenarios, lithium-ion batteries are designed as hard packs and soft packs. Among them, the hard pack is usually composed of a shell, an electrode group and an end cover. The electrode group is arranged inside the shell, and the end cover is arranged on the opening of the shell. Specifically, the inside of the shell is filled with an electrolyte, and the electrolyte reacts chemically with the positive and negative electrodes of the electrode group to discharge. At the same time, gas will also be generated in this chemical reaction, so the end cover of the lithium-ion battery is often provided with an explosion-proof valve to release gas pressure. In addition, a transparent patch is generally affixed to the outer side of the explosion-proof valve to protect the explosion-proof valve structure and avoid pollution such as dust. However, the bonding strength between the transparent patch and the explosion-proof valve is low and it is easy to fall off, resulting in missing stickers and losing the anti-fouling effect of the explosion-proof valve.

[0006] In addition, patches are usually transparent and colorless, and CCD machines have low recognition accuracy, making it impossible to tell whether a patch has been attached to the battery end cap, which can easily lead to the risk of missing a patch. CCD refers to a charge coupled device (CCD), also known as an image sensor, which is a semiconductor device that can convert optical images into digital signals. Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery top cover assembly that can ensure the bonding area between the adhesive layer and the cover body, improve the bonding strength between the protective structure and the cover body, and prevent the protective structure from falling off the cover body.

[0008] The present application also proposes a battery, which includes the above-mentioned top cover assembly of the battery.

[0009] In the first aspect, the present application provides a top cover assembly of a battery, comprising: a cover body, wherein the cover body is provided with a mounting hole; an explosion-proof valve, wherein the explosion-proof valve is arranged in the mounting hole and blocks the mounting hole; a protective structure, wherein the protective structure comprises a protective film and an adhesive layer, wherein the protective film is attached to the cover body through the adhesive layer and is opposite to the mounting hole, the adhesive layer extends along the circumferential direction of the mounting hole, the width of the adhesive layer is a, the distance between the outer contour of the adhesive layer and the inner circumferential wall of the mounting hole is b, and the following conditions are satisfied: a≥b, 0.5mm≤b≤1.5mm.

[0010] According to the first aspect of the present application, the battery top cover assembly is provided with a protective structure comprising a protective film and an adhesive layer. The protective film is attached to the cover body via the adhesive layer and is opposite the mounting hole. This prevents dust contamination, electrolyte from penetrating into and contacting the explosion-proof valve, and electrolyte contamination and corrosion of the explosion-proof valve, which could lead to valve malfunction, thereby achieving the purpose of protecting the explosion-proof valve. By limiting the width of the adhesive layer to a and the distance between the outer contour of the adhesive layer and the inner circumferential wall of the mounting hole to b, where a ≥ b and 0.5 mm ≤ b ≤ 1.5 mm, the adhesive layer can be bonded to the cover body in an area sufficient to improve the bonding strength between the protective structure and the cover body, ensure the reliability and stability of the connection between the protective film and the cover body, prevent the protective structure from falling off the cover body, and reduce the production cost of the battery top cover assembly.

[0011] In addition, the top cover assembly of the battery according to the first aspect of the present application may also have the following additional technical features:

[0012] In an optional embodiment, a satisfies: 0.5 mm ≤ a ≤ 1.5 mm.

[0013] In an optional embodiment, the outer contour of the adhesive layer is flush with the outer contour of the protective film.

[0014] In an optional embodiment, the thickness of the protective film is c, the thickness of the adhesive layer is d, and they satisfy: c≥d.

[0015] In an optional embodiment, the thickness of the protective film is c, and c satisfies: 0.1 mm ≤ c ≤ 0.5 mm; and / or the thickness of the adhesive layer is d, and d satisfies: 0.1 mm ≤ d ≤ 0.5 mm.

[0016] In an optional embodiment, the outer contour of one end of the protective film in the length direction is located inside the inner contour of the mounting hole and forms an exhaust port between the outer contour of the protective film and the inner contour of the mounting hole.

[0017] In an optional embodiment, the adhesive layer is formed into an open ring shape, and the opening of the adhesive layer is located at the exhaust port.

[0018] In an optional embodiment, at the exhaust port, along the length direction of the protective film, the maximum distance between the outer contour of the protective film and the inner contour of the mounting hole is 0.5 mm to 2 mm.

[0019] In an optional embodiment, the protective film is a PET film, a PP film or a PE film.

[0020] In a second aspect, the present application provides a battery, comprising the top cover assembly of the battery described in the first aspect.

[0021] According to the battery of the present application, by providing the above-mentioned battery top cover assembly, by providing a protective structure, the protective structure includes a protective film and an adhesive layer. The protective film is attached to the cover body through the adhesive layer and is opposite to the mounting hole. This can prevent dust pollution, prevent electrolyte from penetrating and contacting the explosion-proof valve, and avoid electrolyte contamination and corrosion of the explosion-proof valve, which may cause the explosion-proof valve to fail, thereby achieving the purpose of protecting the explosion-proof valve. By limiting the width of the adhesive layer to a and the distance between the outer contour of the adhesive layer and the inner peripheral wall of the mounting hole to b, a ≥ b, 0.5 mm ≤ b ≤ 1.5 mm, the area of ​​adhesion between the adhesive layer and the cover body can be guaranteed, the bonding strength between the protective structure and the cover body can be improved, the reliability and stability of the connection between the protective film and the cover body can be guaranteed, the protective structure can be prevented from falling off the cover body, and the production cost of the battery top cover assembly can be reduced.

[0022] Thirdly, the present application provides a battery top cover assembly to address the problem of existing transparent patches having low adhesion strength and easy detachment between the patch and the explosion-proof valve, resulting in missing patches and loss of anti-fouling effect on the explosion-proof valve. The battery top cover assembly includes a cover plate, a patch, and a double-sided adhesive strip. The cover plate is provided with an explosion-proof valve; the patch is located on the outer side of the cover plate and covers the explosion-proof valve; the double-sided adhesive strip is bonded between the cover plate and the patch, and the double-sided adhesive strip extends along the edge of the patch.

[0023] In an optional embodiment, the patch overlaps with the edge of the air vent of the explosion-proof valve, and the overlapping distance is less than or equal to the width of the double-sided adhesive strip.

[0024] In an optional embodiment, a notch is provided at the edge of the patch, and a distance that the notch extends radially along the patch is greater than an overlapping distance between the patch and the edge of the vent.

[0025] In an optional embodiment, there are at least two notches and the double-sided adhesive strip has at least two sections; a gap is formed between two adjacent sections of the double-sided adhesive strip, the gap corresponds to the notch, and the width of the gap is greater than or equal to the width of the notch.

[0026] In an optional embodiment, the overlap distance between the patch and the edge of the ventilation opening is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip is 1.5 mm to 3 mm.

[0027] In an optional embodiment, the ratio of the distance that the notch extends in the radial direction of the patch to the length of the patch is in a range of 1:8 to 1:25.

[0028] In an optional embodiment, the width of the notch is 1 mm to 4 mm, and / or the width of the gap is 2 mm to 10 mm.

[0029] In an optional embodiment, the patch is made of a colorless transparent material, and the double-sided adhesive strip is a fluorescent adhesive film.

[0030] In an optional embodiment, the patch is made of a colorless transparent material, and the double-sided adhesive strip is a colored adhesive film.

[0031] In a fourth aspect, the present application provides a battery, comprising a battery housing, an electrode group disposed inside the battery housing, and the top cover assembly of the battery in the third aspect, wherein the top cover assembly of the battery covers the opening of the battery housing.

[0032] The battery top cover assembly of this application has a double-sided adhesive strip bonded between the cover plate and the patch, which allows the patch to be more firmly attached to the explosion-proof valve and prevents it from falling off, thus preventing the explosion-proof valve from being contaminated. In addition, the double-sided adhesive strip extends along the edge of the patch to enhance sealing and ensure anti-contamination effect.

[0033] The battery according to the fourth aspect of the present application includes the top cover assembly of the battery according to the third aspect, and thus the battery according to the fourth aspect has all the beneficial effects of the top cover assembly of the battery according to the third aspect.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] FIG1 is an exploded view of a top cover assembly of a battery according to an embodiment of the present application;

[0037] FIG2 is a front view of a top cover assembly of a battery according to an embodiment of the present application;

[0038] FIG3 is a schematic structural diagram of a protective structure of a top cover assembly of a battery according to an embodiment of the present application;

[0039] 4 is a schematic structural diagram of the cooperation between the protective structure and the cover body of the top cover assembly of the battery according to an embodiment of the present application;

[0040] FIG5 is an exploded view of a top cover assembly of a battery according to an embodiment of the present application;

[0041] FIG6 is a top view of a top cover assembly of a battery according to an embodiment of the present application;

[0042] FIG7 is a schematic diagram of bonding a patch and a double-sided adhesive strip according to an embodiment of the present application;

[0043] FIG8 is a diagram showing the relationship between the dimensions of the patch, the vent, and the double-sided adhesive strip according to an embodiment of the present application.

[0044] Figure numerals: 100, top cover assembly of the battery; 1, cover body; 11, mounting hole; 2, explosion-proof valve; 3, protective structure; 31, protective film; 311, exhaust port; 32, adhesive layer; 321, opening; 200, top cover assembly of the battery; 110, cover plate; 120, patch; 130, double-sided adhesive strip; 111, explosion-proof valve; 112, pole; 1111, vent; 121, notch; 131, gap. DETAILED DESCRIPTION

[0045] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0048] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] Example 1

[0050] The top cover assembly 100 of the battery according to Embodiment 1 of the present application will be described below with reference to the accompanying drawings.

[0051] As shown in FIG1 , the top cover assembly 100 of the battery according to Embodiment 1 of the present application includes a cover body 1 , an explosion-proof valve 2 and a protection structure 3 .

[0052] Specifically, as shown in FIG1 , the cover body 1 is provided with a mounting hole 11. The explosion-proof valve 2 is disposed within and blocks the mounting hole 11. The provision of the explosion-proof valve 2 can discharge high-temperature, high-pressure gases within the battery, preventing fires and serious safety accidents, thereby improving the safety performance of the battery. Optionally, the cover body 1 is made of a plain aluminum sheet, and the explosion-proof valve 2 is laser welded to the cover body 1.

[0053] Further, referring to Figure 1, the protective structure 3 includes a protective film 31 and an adhesive layer 32. The protective film 31 is attached to the cover body 1 through the adhesive layer 32 and is opposite to the mounting hole 11. The setting of the protective film 31 can prevent dust pollution, prevent the electrolyte from penetrating into and contacting the explosion-proof valve 2, and avoid electrolyte contamination and corrosion of the explosion-proof valve 2, which may cause the explosion-proof valve 2 to fail, thereby achieving the purpose of protecting the explosion-proof valve 2.

[0054] Furthermore, referring to Figure 4, the adhesive layer 32 extends along the circumferential direction of the mounting hole 11, the width of the adhesive layer 32 is a, the distance between the outer contour of the adhesive layer 32 and the inner circumferential wall of the mounting hole 11 is b, and satisfies: a≥b, 0.5mm≤b≤1.5mm, which can ensure the bonding area of ​​the adhesive layer 32 and the cover body 1, improve the fitting strength and coordination degree between the protective structure 3 and the cover body 1, ensure the reliability and stability of the connection between the protective film 31 and the cover body 1, avoid the protective structure 3 from falling off the cover body 1, and save the production cost of the battery top cover assembly 100.

[0055] For example, the distance b between the outer contour of the adhesive layer 32 and the inner circumferential wall of the mounting hole 11 can be 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.4 mm, or 1.5 mm. In a specific example, referring to FIG4 , along the length direction of the battery top cover assembly 100 (refer to the direction i in FIG4 ), the outer diameter e of the adhesive layer 32 is 23.6 mm, the aperture f of the mounting hole 11 is 22 mm, and the distance b between the outer contour of the adhesive layer 32 and the inner circumferential wall of the mounting hole 11 is 0.8 mm.

[0056] According to the battery top cover assembly 100 of Example 1 of the present application, a protective structure 3 is provided. The protective structure 3 includes a protective film 31 and an adhesive layer 32. The protective film 31 is attached to the cover body 1 and opposite the mounting hole 11 via the adhesive layer 32. This prevents dust contamination, electrolyte from penetrating into and contacting the explosion-proof valve 2, and electrolyte contamination and corrosion of the explosion-proof valve 2, which could lead to functional failure of the explosion-proof valve 2, thereby achieving the purpose of protecting the explosion-proof valve 2. By limiting the width of the adhesive layer 32 to a and the distance between the outer contour of the adhesive layer 32 and the inner circumferential wall of the mounting hole 11 to b, where a ≥ b and 0.5 mm ≤ b ≤ 1.5 mm, the area of ​​adhesion between the adhesive layer 32 and the cover body 1 is guaranteed, improving the bonding strength between the protective structure 3 and the cover body 1, ensuring the reliability and stability of the connection between the protective film 31 and the cover body 1, preventing the protective structure 3 from falling off the cover body 1, and reducing the production cost of the battery top cover assembly 100.

[0057] In some embodiments of the present application, with reference to Figures 3 and 4, a satisfies: 0.5mm≤a≤1.5mm, which can ensure the bonding area of ​​the adhesive layer 32, ensure the width of the adhesive layer 32 and the cover body 1, improve the bonding strength between the protective structure 3 and the cover body 1, and ensure the reliability and stability of the connection between the protective film 31 and the cover body 1. For example, the width a of the adhesive layer 32 can be 0.5mm, 0.8mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm. In a specific example, with reference to Figure 3, along the length direction of the top cover assembly 100 of the battery, the outer diameter e of the adhesive layer 32 is 23.6mm, the inner diameter g of the adhesive layer 32 is 20.6mm, and the width a of the adhesive layer 32 is 1.5mm.

[0058] In some embodiments of the present application, as shown in Figures 3 and 4 , the outer contour of the adhesive layer 32 is flush with the outer contour of the protective film 31. This facilitates attachment of the protective structure 3 to the cover body 1, ensures reliable adhesion of the protective film 31 to the cover body 1, avoids insufficient adhesion strength at the periphery of the protective film 31, and prevents the adhesive layer 32 from overflowing from the outside of the protective film 31, causing waste and affecting the appearance. In a specific example, as shown in Figure 3 , along the length of the battery top cover assembly 100, the length of the protective film 31 is 23.6 mm, and the outer diameter e of the adhesive layer 32 is also 23.6 mm.

[0059] In some embodiments of the present application, the thickness of the protective film 31 is c, the thickness of the adhesive layer 32 is d, and the condition c≥d is satisfied. The thickness d of the adhesive layer 32 is limited to not exceed the thickness c of the protective film 31. This can avoid the waste of resources caused by the excessive thickness d of the adhesive layer 32, thereby saving the production cost of the battery top cover assembly 100 to a certain extent.

[0060] In some embodiments of the present application, the thickness of the protective film 31 is c, where c satisfies the following: 0.1 mm ≤ c ≤ 0.5 mm. This ensures the structural strength of the protective film 31, reduces the probability of deformation of the protective film 31, and reduces the production cost of the battery top cover assembly 100. For example, the thickness c of the protective film 31 can be 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.4 mm, or 0.5 mm. In one specific example, the thickness c of the protective film 31 is 0.15 mm.

[0061] Furthermore, the thickness of the adhesive layer 32 is d, where d satisfies the following relationship: 0.1 mm ≤ d ≤ 0.5 mm. This ensures the adhesive strength and peel strength of the adhesive layer 32, thereby reducing the production cost of the battery top cover assembly 100. For example, the thickness d of the adhesive layer 32 can be 0.1 mm, 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. In one specific example, the thickness d of the adhesive layer 32 is 0.1 mm.

[0062] Optionally, the adhesive layer 32 can be made of 3M double-sided tape. The peel strength of the adhesive layer 32 is greater than 20 N / in, ensuring reliable adhesion between the protective film 31 and the cover body 1, thereby improving the stability and reliability of the battery top cover assembly 100. Of course, the present application is not limited thereto. The adhesive layer 32 can also be made of BC double-sided tape, or other adhesives with equivalent bonding strength. Furthermore, the adhesive layer 32 is colorless and transparent, facilitating adhesion between the protective film 31 and the cover body 1.

[0063] In some embodiments of the present application, referring to Figures 2 and 4, the outer contour of one end of the protective film 31 in the length direction (refer to the j direction shown in Figure 4) is located on the inner side of the inner contour of the mounting hole 11 and forms an exhaust port 311 between the inner contour of the mounting hole 11, which can allow the explosion-proof valve 2 to ventilate, thereby preventing the protective structure 3 from blocking the normal opening of the explosion-proof valve 2, thereby improving the safety of the battery.

[0064] In a further embodiment of the present application, referring to Figures 1, 3 and 4, the adhesive layer 32 is formed into an open ring shape, and the opening 321 of the adhesive layer 32 is located at the exhaust port 311 to avoid the exhaust port 311, thereby preventing the adhesive layer 32 from blocking the exhaust port 311 and affecting the normal opening of the explosion-proof valve 2, thereby improving the safety and reliability of the battery.

[0065] In a further embodiment of the present application, as shown in FIG4 , at the vent 311 , along the length of the protective film 31 , the maximum distance h between the outer contour of the protective film 31 and the inner contour of the mounting hole 11 is 0.5 mm to 2 mm. This ensures that the explosion-proof valve 2 can open normally while preventing dust from outside the battery from contaminating the explosion-proof valve 2 through the vent 311 , preventing electrolyte from entering and contacting the explosion-proof valve 2 , and preventing electrolyte contamination and corrosion of the explosion-proof valve 2 that could cause the explosion-proof valve 2 to fail, thereby ensuring the effectiveness of the explosion-proof valve 2. For example, along the length of the protective film 31 , the maximum distance h between the outer contour of the protective film 31 and the inner contour of the mounting hole 11 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, or 2 mm. In a specific example, as shown in FIG4 , along the length of the protective film 31 , the maximum distance h between the outer contour of the protective film 31 and the inner contour of the mounting hole 11 is 0.6 mm.

[0066] In some embodiments of the present application, the protective film 31 is a PET (polyethylene terephthalate) film, a PP (polypropylene) film, or a PE (polyethylene) film, which has good mechanical properties, excellent electrical insulation, and good corrosion resistance. This can ensure the stability of the protective film 31, extend the service life of the protective film 31, and improve the reliability of the battery top cover assembly 100. Of course, the present application is not limited to this, and the protective film 31 can also be other plastic films.

[0067] In some embodiments of the present application, the protective film in the prior art is usually transparent and colorless, and the machine CCD (photosensitive coupling device) has low recognition, making it difficult to identify whether the protective film is attached to the mounting hole, and there is often a risk of missing the protective film. The protective film 31 of the present application can be green, blue, red or other easily recognizable colors. By limiting the color of the protective film 31 to an easily recognizable color, the detection accuracy of the CCD for the protective film 31 can be improved, and the problem of missing the protective film 31 can be avoided.

[0068] Example 2

[0069] The present application also provides a battery having the top cover assembly 100 of the battery of the above-mentioned embodiment 1.

[0070] According to the battery of Example 2 of the present application, the battery top cover assembly 100 described above is provided with a protective structure 3, which includes a protective film 31 and an adhesive layer 32. The protective film 31 is attached to the cover body 1 via the adhesive layer 32 and is opposite to the mounting hole 11. This prevents dust contamination, prevents electrolyte from penetrating and contacting the explosion-proof valve 2, and prevents electrolyte contamination and corrosion of the explosion-proof valve 2, which may cause the explosion-proof valve 2 to fail, thereby achieving the purpose of protecting the explosion-proof valve 2. By limiting the width of the adhesive layer 32 to a and the distance between the outer contour of the adhesive layer 32 and the inner peripheral wall of the mounting hole 11 to b, where a ≥ b and 0.5 mm ≤ b ≤ 1.5 mm, the area of ​​adhesion between the adhesive layer 32 and the cover body 1 is guaranteed, the bonding strength between the protective structure 3 and the cover body 1 is improved, the reliability and stability of the connection between the protective film 31 and the cover body 1 is guaranteed, the protective structure 3 is prevented from falling off the cover body 1, and the production cost of the battery top cover assembly 100 is reduced.

[0071] Example 3

[0072] 5 and 6 , the present application provides a battery top cover assembly 100, comprising a cover plate 110, a patch 120, and a double-sided adhesive strip 130. The cover plate 110 is provided with an explosion-proof valve 111; the patch 120 is located on the outer side of the cover plate 110 and covers the explosion-proof valve 111; and the double-sided adhesive strip 130 is bonded between the cover plate 110 and the patch 120, extending along the edge of the patch 120.

[0073] Specifically, the battery top cover assembly 100 in this embodiment has a double-sided adhesive strip 130 bonded between the cover plate 110 and the patch 120. This allows the patch 120 to be more firmly attached to the explosion-proof valve 111, preventing it from falling off and thus preventing the explosion-proof valve 111 from being contaminated. Furthermore, the double-sided adhesive strip 130 extends along the edge of the patch 120, enhancing sealing and ensuring anti-contamination.

[0074] More specifically, the explosion-proof valve 111 can be mounted on the cover plate 110 by laser welding. The cover plate 110 is further provided with positive and negative poles 112 , which are electrically connected to the positive and negative tabs of the electrode group.

[0075] It should be noted that the thickness of the double-sided adhesive strip 130 is generally smaller than the thickness of the patch 120, so as to ensure that the patch 120 does not bulge too much, thereby occupying a certain amount of space.

[0076] Furthermore, the material of the patch 120 can be but is not limited to PP, PE and PET, and PET can be selected; the thickness of the patch 120 is 0.1mm to 0.2mm, and 0.1mm can be selected; the peel strength of the double-sided adhesive strip 130 is 15N / in to 20N / in; the thickness of the double-sided adhesive strip 130 is 0.05mm to 0.15mm, and 0.08mm can be selected.

[0077] In some embodiments of the present application, referring to FIG. 8 , the patch 120 overlaps with the edge of the vent 1111 of the explosion-proof valve 111 , and the overlapping distance is less than or equal to the width of the double-sided tape 130 .

[0078] Specifically, in this solution, the patch 120 overlaps with the edge of the air vent 1111 of the explosion-proof valve 111, and the overlapping distance is less than or equal to the width of the double-sided tape 130, so that the double-sided tape 130 completely covers the overlapping area, thereby increasing the bonding strength between the patch 120 and the cover plate 110.

[0079] More specifically, the air vent 1111 of the explosion-proof valve 111 can be a waist hole, and the patch 120 has the same shape as the air vent 1111 , except that the patch 120 is slightly larger than the air vent 1111 , so that it overlaps the edge of the air vent 1111 .

[0080] Furthermore, the outer edge of the double-sided tape 130 is aligned with the edge of the patch 120, and the width of the double-sided tape 130 can be selected to be twice the overlap distance, that is, after the patch 120 is attached to the air vent 1111, the outer half of the double-sided tape 130 is respectively bonded to the patch 120 and the cover plate 110, and the inner half is only bonded to the patch 120.

[0081] In some embodiments of the present application, referring to Figure 8, a notch 121 is provided at the edge of the patch 120, and the distance that the notch 121 extends radially along the patch 120 is greater than the overlap distance between the patch 120 and the edge of the air vent 1111, that is, the depth of the notch 121 is greater than the overlap distance between the patch 120 and the edge of the air vent 1111.

[0082] Specifically, in this solution, a notch 121 is provided on the edge of the patch 120, and the depth of the notch 121 is greater than the overlap distance between the patch 120 and the edge of the vent 1111. The notch 121 facilitates ventilation of the explosion-proof valve 111, preventing the patch 120 from blocking the explosion-proof valve 111 from opening for ventilation.

[0083] In some embodiments of the present application, referring to Figure 7, there are at least two notches 121, and the double-sided adhesive strip 130 has at least two sections; a gap 131 is formed between two adjacent sections of the double-sided adhesive strip 130, the gap 131 corresponds to the notch 121, and the width of the gap 131 is greater than or equal to the width of the notch 121.

[0084] Specifically, in this solution, there are at least two notches 121, and the double-sided adhesive strip 130 has at least two sections; a gap 131 is formed between two adjacent sections of the double-sided adhesive strip 130, the gap 131 corresponds to the notch 121, and the width of the gap 131 is greater than or equal to the width of the notch 121; multiple notches 121 further facilitate ventilation of the explosion-proof valve 111, and gaps 131 are formed correspondingly between multiple sections of the double-sided adhesive strip 130 at the notch 121, forming an avoidance structure to prevent the double-sided adhesive strip 130 from blocking the notch 121.

[0085] In some embodiments of the present application, referring to FIG. 8 , the overlap distance between the patch 120 and the edge of the vent 1111 is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip 130 is 1.5 mm to 3 mm.

[0086] In some embodiments of the present application, referring to FIG8 , the ratio of the distance along which the notch extends radially of the patch to the length of the patch ranges from 1:8 to 1:25; specifically, the depth of the notch 121 is from 2 mm to 5 mm.

[0087] In some embodiments of the present application, referring to FIG. 8 , the width of the notch 121 is 1 mm to 4 mm, and / or the width of the gap 131 is 2 mm to 10 mm.

[0088] Specifically, assuming that the overlap distance is e3, the width of the double-sided tape 130 is c3, the depth of the notch 121 is a1, the width of the notch 121 is a2, the gap 131 is d3, the width of the patch 120 is a3, the width of the vent 1111 is A, and the distance between the inner edges of the upper and lower sections of the double-sided tape 130 is b3, then c3 = (a3-b3) / 2, d3 = (a3-A) / 2.

[0089] Optionally, a3 is 23.6 mm, b3 is 20.6 mm, c3 is 2 mm, d3 is 8 mm, A is 20.6 mm, e3 is 1.5 mm, a1 is 3 mm, and a2 is 3 mm.

[0090] If e3 is too small, the bonding strength of patch 120 will be low; if e3 is too large, production costs will increase. In addition, a1 and a2 should not be too large to prevent external dust from entering or electrolyte from being spilled during injection, which could cause explosion-proof valve 111 to fail.

[0091] In some embodiments of the present application, the patch 120 is made of a colorless transparent material, and the double-sided adhesive strip 130 is a fluorescent adhesive film.

[0092] Specifically, this solution is a specific implementation method for improving the CCD recognition accuracy of the machine and reducing the risk of missing the patch 120 of the explosion-proof valve 111.

[0093] In some embodiments of the present application, the patch 120 is made of a colorless transparent material, and the double-sided adhesive strip 130 is a colored adhesive film.

[0094] Specifically, this solution is another specific implementation method for improving the CCD recognition accuracy of the machine and reducing the risk of missing the patch 120 of the explosion-proof valve 111.

[0095] More specifically, the double-sided tape 130 is in a color that is easily recognizable, such as blue, green, or red.

[0096] For ease of understanding, it is further explained that the patch 120 is usually a transparent and colorless structure. The machine CCD has low recognition and cannot determine whether the battery end cap has been affixed with the patch 120, which easily leads to the risk of missing it. Among them, CCD refers to a charge coupled device (CCD), which can also be called a CCD image sensor. It is a semiconductor device that can convert optical images into digital signals.

[0097] Example 4

[0098] The present application also proposes a battery, comprising a battery housing, a pole group disposed inside the battery housing, and a battery top cover assembly 100, wherein the battery top cover assembly 100 covers an opening of the battery housing.

[0099] Specifically, the battery of Example 4 includes a battery top cover assembly 100, and thus the battery has all the beneficial effects of the battery top cover assembly 100. In addition, the battery of Example 4 also includes other components such as a battery protection plate. Only components related to this solution are listed here, and this does not limit the composition of the battery.

[0100] The top cover assembly of the battery according to the embodiment of the present application and other structures and operations of the battery are well known to ordinary technicians in this field and will not be described in detail here.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0102] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A top cover assembly of a battery, characterized in that: include: A cover body, wherein the cover body is provided with a mounting hole; an explosion-proof valve, the explosion-proof valve being arranged in the mounting hole and blocking the mounting hole; A protective structure, the protective structure comprising a protective film and an adhesive layer, the protective film being attached to the cover body via the adhesive layer and opposite to the mounting hole, the adhesive layer extending along the circumferential direction of the mounting hole, the width of the adhesive layer being a, the distance between the outer contour of the adhesive layer and the inner circumferential wall of the mounting hole being b, and satisfying: a≥b, 0.5mm≤b≤1.5mm.

2. The top cover assembly of the battery according to claim 1, characterized in that: The a satisfies: 0.5mm≤a≤1.5mm.

3. The top cover assembly of the battery according to claim 1, characterized in that: The outer contour of the adhesive layer is flush with the outer contour of the protective film.

4. The top cover assembly of the battery according to claim 1, characterized in that: The thickness of the protective film is c, the thickness of the adhesive layer is d, and they satisfy: c≥d.

5. The top cover assembly of the battery according to claim 1, characterized in that: The thickness of the protective film is c, and c satisfies: 0.1mm≤c≤0.5mm; And / or, the thickness of the adhesive layer is d, and d satisfies: 0.1 mm≤d≤0.5 mm.

6. The top cover assembly of the battery according to claim 1, characterized in that: An outer contour of one end of the protective film in the length direction is located inside the inner contour of the mounting hole and forms an exhaust port between the outer contour of the protective film and the inner contour of the mounting hole.

7. The top cover assembly of the battery according to claim 6, characterized in that: The adhesive layer is formed in an open ring shape, and the opening of the adhesive layer is located at the exhaust port.

8. The top cover assembly of the battery according to claim 6, characterized in that: At the exhaust port, along the length direction of the protective film, the maximum distance between the outer contour of the protective film and the inner contour of the mounting hole is 0.5 mm-2 mm.

9. The top cover assembly of the battery according to claim 1, characterized in that: The protective film is a PET film, a PP film or a PE film.

10. A battery, characterized in that: A top cover assembly comprising a battery according to any one of claims 1-9.

11. A top cover assembly of a battery, characterized in that: include: Cover plate, equipped with explosion-proof valve; A patch, located on the outer side of the cover plate and covering the explosion-proof valve; A double-sided adhesive strip is bonded between the cover plate and the patch, and the double-sided adhesive strip extends along the edge of the patch.

12. The top cover assembly of the battery according to claim 11, characterized in that: The patch overlaps with the edge of the air vent of the explosion-proof valve, and the overlapping distance is less than or equal to the width of the double-sided adhesive strip.

13. The top cover assembly of the battery according to claim 12, characterized in that: A notch is provided at the edge of the patch, and a distance that the notch extends radially along the patch is greater than a distance that overlaps the patch and the edge of the vent.

14. The top cover assembly of the battery according to claim 13, characterized in that: The notches have at least two, and the double-sided adhesive strip has at least two sections; A gap is formed between two adjacent sections of the double-sided adhesive strips, the gap corresponds to the notch, and the width of the gap is greater than or equal to the width of the notch.

15. The top cover assembly of the battery according to claim 12, characterized in that: The overlap distance between the patch and the edge of the ventilation opening is 1.5 mm to 2.5 mm, and / or the width of the double-sided adhesive strip is 1.5 mm to 3 mm.

16. The top cover assembly of the battery according to claim 13, characterized in that: The ratio of the distance that the notch extends along the radial direction of the patch to the length of the patch is in a range of 1:8 to 1:

25.

17. The top cover assembly of the battery according to claim 14, characterized in that: The width of the notch is 1 mm to 4 mm, and / or the width of the gap is 2 mm to 10 mm.

18. The top cover assembly of a battery according to any one of claims 11 to 17, characterized in that: The patch is made of colorless and transparent material, and the double-sided adhesive strip is a fluorescent adhesive film.

19. The top cover assembly of a battery according to any one of claims 11 to 17, characterized in that: The patch is made of colorless and transparent material, and the double-sided adhesive strip is a colored adhesive film.

20. A battery, characterized in that: The invention comprises a battery casing, a pole group arranged inside the battery casing, and a top cover assembly of the battery according to any one of claims 11 to 19, wherein the top cover assembly of the battery covers the opening of the battery casing.

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