Cover plate structure and button cell

Abstract

The invention provides a cover plate structure. The cover plate structure comprises a metal cover plate, a cover cap, an adhesive film and an aluminum connecting sheet, the metal cover plate is connected with a cell cathode; the aluminum connecting sheet is used for connecting the positive electrode of the battery cell; the metal cover plate, the cap and the adhesive film are arranged on the same side of the aluminum connecting sheet; a through hole is formed in the metal cover plate, the cover cap is arranged in the through hole, the periphery of the cover cap and the inner wall of the through hole are arranged at intervals through a first gap, and the metal cover plate and the aluminum connecting piece are arranged at intervals through a second gap. The adhesive film comprises a first film and a second film; the first film is filled in the first gap; the second film is filled in the second gap; according to the battery cover plate structure, the battery cell positive electrode and the cover cap are connected through the aluminum connecting piece, electric connection between the battery cell positive electrode and the cover cap is facilitated, the cover cap arranged in the through hole is directly adopted as the positive electrode output end, use of a positive electrode terminal with a complex structure is avoided, the cover plate structure is simplified, the product weight is reduced, and weight reduction and cost reduction of the battery cover plate structure are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of button batteries, and in particular to a cover plate structure and a button battery. Background Art Button batteries are smaller batteries that are currently widely used in various small electronic devices such as wireless Bluetooth headsets (TWS), wearable terminal products, and IoT terminals. Button batteries usually include a cover structure, a battery shell, and a battery cell. The battery cell is housed inside the battery shell. The cover structure is connected to the battery shell, and the battery shell is connected to the negative electrode of the battery cell. The cover structure includes a metal cover and an electrode terminal insulated and mounted on the metal cover. The electrode terminal is welded to the positive ear of the battery cell. In the prior art, the connection structure between the metal cover and the positive terminal is relatively complicated, resulting in a complex cover structure and more components for the existing steel shell button battery. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the invention

[0002] In view of the problem that the connection structure between the existing metal cover plate and the cap is relatively complicated, the present invention provides a cover plate structure and a button battery.

[0003] The technical solution adopted by the present invention to solve the above technical problems is as follows: In one aspect, the present invention provides a cover plate structure, including a metal cover plate, a cover cap, an adhesive film and an aluminum connecting sheet; The metal cover is used to connect the negative electrode of the battery cell and to cover the shell of the button battery; The aluminum connecting piece is used to connect the positive electrode of the battery cell, and the metal cover plate, the cap and the adhesive film are arranged on the same side of the aluminum connecting piece; The metal cover plate is provided with a through hole, the cap is arranged in the through hole, the outer periphery of the cap and the inner wall of the through hole are spaced apart by a first gap, and the metal cover plate and the aluminum material connecting sheet are spaced apart by a second gap; The adhesive film includes a first film and a second film; the first film is in a hollow cylindrical shape and filled in the first gap; the second film is in an annular sheet structure and filled in the second gap; the inner periphery of the second film is connected to the outer periphery of the first end of the first film.

[0004] Optionally, the outer periphery of the second film extends along a direction away from the axis of the cap body to the lower surface of the metal cover plate, and extends out of the outer periphery of the aluminum connecting plate. The side of the second film facing the metal cover plate is bonded to the lower surface of the metal cover plate, and the side of the second film facing the aluminum connecting plate is bonded to the upper surface of the aluminum connecting plate.

[0005] Optionally, the cap includes a cap body and a brim body, the brim body is an annular sheet structure, the cap body is a columnar structure, the inner periphery of the brim body is connected to the outer periphery of one end of the cap body close to the aluminum connecting plate, the outer periphery of the brim body extends in a direction away from the axis of the cap body, and the lower surface of the brim body abuts against the upper surface of the aluminum connecting plate; the first gap is arranged between the outer periphery of the eaves body and the inner wall of the through hole, and the inner periphery of the first film is bonded to the outer periphery of the eaves body.

[0006] Optionally, the adhesive film includes a third film, which is an annular sheet structure, the inner periphery of the third film is connected to the outer periphery of the second end of the first film, and the outer periphery of the third film extends along a direction away from the axis of the cap body to the upper surface of the metal cover plate and is bonded to the upper surface of the metal cover plate.

[0007] Optionally, the adhesive film includes a fourth film, which is an annular sheet structure, the outer periphery of the fourth film is connected to the inner periphery of the second end of the first film, the inner periphery of the fourth film extends to the upper surface of the eaves along a direction close to the axis of the cap body and is bonded to the upper surface of the eaves.

[0008] Optionally, the upper surface of the fourth film, the upper surface of the first film and the upper surface of the third film are flush; the lower surface of the fourth film is flush with the upper surface of the second film; the lower surface of the eaves, the lower surface of the first film and the lower surface of the second film are flush.

[0009] Optionally, the cap body is a hollow structure with one end open, and the eaves body is connected to the outer periphery of the open end of the cap body; The aluminum connecting piece is provided with an air hole, and the air hole is connected to the open end of the cap body.

[0010] Optionally, the thickness of the metal cover plate is amm, and the value of a is: 0.1≤a≤0.3; The width of the first gap is b mm, and the value of b is: 1.0≤b≤2.0.

[0011] Optionally, the distance between the inner periphery and the outer periphery of the second film is cmm, and the value of c is: 0.1≤c≤0.3; the thickness of the second film is dmm, and the value of d is: 0.2≤d≤0.4.

[0012] Optionally, the distance between the inner periphery and the outer periphery of the third film is emm, and the value of e is: 0.5≤e≤1.0; the thickness of the third film is fmm, and the value of f is: 0.1≤f≤0.3.

[0013] Optionally, the distance between the inner periphery and the outer periphery of the fourth film is gmm, and the value of g is: 0.6≤g≤1.0; the thickness of the fourth film is hmm, and the value of h is: 0.1≤h≤0.3.

[0014] Optionally, the distance between the outer periphery of the second film and the outer periphery of the aluminum connecting sheet is imm, and the value of i is: 0.3≤i≤0.8; The distance between the outer periphery of the second film and the outer periphery of the metal cover plate is j mm, and the value of j is: 0.3≤j≤1.5.

[0015] Another aspect of the present invention provides a button battery, comprising a shell, a battery cell and the cover plate structure as described above, wherein the battery cell is disposed in the shell, and the metal cover plate is sealingly covered on the shell.

[0016] The cover plate structure provided by the present invention connects the positive electrode of the battery cell and the cap through an aluminum connecting sheet, which facilitates the electrical connection between the positive electrode of the battery cell and the cap, and fills a first gap between the outer periphery of the cap and the inner wall of the through hole with a first film, so that the metal cover plate and the cap form a whole, and fills a second gap between the metal cover plate and the aluminum connecting sheet with a second film, thereby integrating the metal cover plate, the cap and the aluminum connecting sheet into a cover plate structure, which not only increases the bonding area of ​​the adhesive film to the metal cover plate, the cap and the aluminum connecting sheet, but also further increases the bonding strength of the adhesive film to the metal cover plate, the cap and the aluminum connecting sheet, improves the overall strength of the cover plate structure through the aluminum connecting sheet and the adhesive film, reduces the probability of deformation of the cover plate structure, and ensures reliable insulation and sealed connection between the metal cover plate and the cap; directly adopts the cap arranged in the through hole as the positive electrode output terminal, avoids the use of a positive electrode terminal with a complex structure, simplifies the cover plate structure, and achieves weight reduction and cost reduction of the battery cover plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a structural schematic diagram of a cover plate structure provided by an embodiment of the present invention; Figure 2 is a labeled schematic diagram of a cover plate structure provided by an embodiment of the present invention; Figure 3 is a schematic diagram of an assembly process of a battery provided by an embodiment of the present invention; The reference numerals in the drawings of the specification are as follows: 100-cover structure; 1-metal cover; 11-through hole; 2-cap; 21-cap body; 22-eaves body; 3-adhesive film; 31-first film; 32-second film; 33-third film; 34-fourth film; 4-aluminum connecting piece; 41-vent; 200-battery; 201-shell; 202-battery cell. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 As shown, in one embodiment, the present invention provides a cover plate structure 100, including a metal cover plate 1, a cover cap 2, an adhesive film 3 and an aluminum connecting sheet 4; The metal cover plate 1 is used to connect the negative electrode of the battery cell 202 and to cover the shell 201 of the button battery 200; The aluminum connecting piece 4 is used to connect the positive electrode of the battery cell 202, and the metal cover plate 1, the cap 2 and the adhesive film 3 are arranged on the same side of the aluminum connecting piece 4; The metal cover plate 1 is provided with a through hole 11, the cap 2 is arranged in the through hole 11, the outer periphery of the cap 2 and the inner wall of the through hole 11 are spaced apart by a first gap, and the metal cover plate 1 and the aluminum material connecting sheet 4 are spaced apart by a second gap; The adhesive film 3 includes a first film 31 and a second film 32. The first film 31 is a hollow cylindrical structure filled in the first gap; the second film 32 is an annular sheet structure filled in the second gap; the inner periphery of the second film 32 is connected to the outer periphery of the first end of the first film 31.

[0023] Specifically, the through hole 11 can be set in the area close to the edge of the metal cover plate 1, or in the middle of the metal cover plate 1, ensuring that the edge of the metal cover plate 1 has sufficient connection edge to be welded (or connected in other ways) to the shell 201 of the button battery 200.

[0024] Specifically, the material of the adhesive film 3 of the present invention is epoxy resin glue or PP glue.

[0025] The cover plate structure 100 provided by the present invention connects the positive electrode of the battery cell 202 and the cap 2 through the aluminum connecting piece 4, which facilitates the electrical connection between the positive electrode of the battery cell 202 and the cap 2, and fills the first gap between the outer periphery of the cap 2 and the inner wall of the through hole 11 with the first film 31, so that the metal cover plate 1 and the cap 2 form a whole, and fills the second gap between the metal cover plate 1 and the aluminum connecting piece 4 with the second film 32, so that the metal cover plate 1, the cap 2 and the aluminum connecting piece 4 are integrated into the cover plate structure 100, which not only increases the bonding area of ​​the adhesive film 3 to the metal cover plate 1, the cap 2 and the aluminum connecting piece 4, but also further increases the bonding strength of the adhesive film 3 to the metal cover plate 1, the cap 2 and the aluminum connecting piece 4, and improves the overall strength of the cover plate structure 100 through the aluminum connecting piece 4 and the adhesive film 3, reduces the probability of deformation of the cover plate structure 100, and ensures reliable insulation and sealed connection between the metal cover plate 1 and the cap 2; The cap 2 disposed in the through hole 11 is directly used as the positive electrode output terminal, so as to avoid the use of a positive electrode terminal with a complex structure, simplify the cover plate structure 100, and achieve weight reduction and cost reduction of the cover plate structure 100.

[0026] like Figure 1 As shown, in one embodiment, the outer periphery of the second film 32 extends to the lower surface of the metal cover plate 1 along the axial direction away from the cap body 21, and extends out of the outer periphery of the aluminum connecting sheet 4. The side of the second film 32 facing the metal cover plate 1 is bonded to the lower surface of the metal cover plate 1, and the side of the second film 32 facing the aluminum connecting sheet 4 is bonded to the upper surface of the aluminum connecting sheet 4.

[0027] Specifically, along the direction perpendicular to the lower surface of the metal cover plate 1, the projection of the second film 32 is located inside the lower surface of the metal cover plate 1; along the direction perpendicular to the upper surface of the aluminum connecting sheet 4, the periphery of the projection of the second film 32 is located outside the upper surface of the aluminum connecting sheet 4. The second film 32 bonds the metal cover plate 1 and the aluminum connecting sheet 4 into a whole, thereby increasing the bonding area of ​​the adhesive film 3 to the metal cover plate 1 and the aluminum connecting sheet 4, improving the overall strength of the cover plate structure 100, and reducing the probability of deformation of the cover plate structure 100; and avoiding contact between the metal cover plate 1 and the aluminum connecting sheet 4, thereby avoiding a short circuit in the battery 200.

[0028] like Figure 1 As shown, in one embodiment, the cap 2 includes a cap body 21 and a brim body 22, the brim body 22 is an annular sheet structure, the cap body 21 is a columnar structure, the inner periphery of the brim body 22 is connected to the outer periphery of one end of the cap body 21 close to the aluminum connecting plate 4, the outer periphery of the brim body 22 extends in a direction away from the axis of the cap body 21, and the lower surface of the eaves body 22 abuts against the upper surface of the aluminum connecting plate 4; the first gap is provided between the outer periphery of the eaves body 22 and the inner wall of the through hole 11, and the inner periphery of the first film 31 is bonded to the outer periphery of the eaves body 22.

[0029] Specifically, the first film 31 of the present invention is filled between the inner periphery of the metal cover plate 1 and the outer periphery of the eaves body 22 through a hot pressing process, thereby bonding the metal cover plate 1 and the cap 2 to form a whole.

[0030] like Figure 1 As shown, in one embodiment, the adhesive film 3 includes a third film 33, which is an annular sheet structure. The inner periphery of the third film 33 is connected to the outer periphery of the second end of the first film 31, and the outer periphery of the third film 33 extends along the direction away from the axis of the cap body 21 to the upper surface of the metal cover plate 1 and is bonded to the upper surface of the metal cover plate 1.

[0031] Specifically, the third film 33 extends to the upper surface of the metal cover plate 1 and bonds to the upper surface of the metal cover plate 1, thereby increasing the bonding area and bonding strength of the adhesive film 3 to the metal cover plate 1, improving the overall strength of the cover plate structure 100, and reducing the probability of deformation of the cover plate structure 100.

[0032] like Figure 1 As shown, in one embodiment, the adhesive film 3 includes a fourth film 34, which is an annular sheet structure. The outer periphery of the fourth film 34 is connected to the inner periphery of the second end of the first film 31, and the inner periphery of the fourth film 34 extends along the axial direction close to the cap body 21 to the upper surface of the eaves body 22 and is bonded to the upper surface of the eaves body 22.

[0033] Specifically, the fourth film 34 extends to the upper surface of the eaves 22 and is bonded to the upper surface of the eaves 22, thereby increasing the bonding area and bonding strength of the adhesive film 3 to the eaves 22, improving the overall strength of the cover structure 100, and reducing the probability of deformation of the cover structure 100.

[0034] like Figure 1 As shown, in one embodiment, the upper surface of the fourth film 34, the upper surface of the first film 31 and the upper surface of the third film 33 are flush; the lower surface of the fourth film 34 is flush with the upper surface of the second film 32; the lower surface of the eaves 22, the lower surface of the first film 31 and the lower surface of the second film 32 are flush. The simplified structure facilitates the close contact between the eaves 22 of the cap 2 and the aluminum connecting sheet 4, ensuring the reliability of the electrical connection between the positive electrode of the battery cell 202 and the cap 2. The eaves 22 and the metal cover plate 1 are staggered, which is conducive to buffering the non-axial force of the cap 2. Compared with the second film 32 and the third film 33, the thickness of the first film 31 and the thickness of the fourth film 34 are increased, which is conducive to improving the bonding reliability of the adhesive film 3 to the metal cover plate 1.

[0035] like Figure 1 As shown, in one embodiment, the cap body 21 is a hollow structure with an opening at one end, and the eaves body 22 is connected to the outer periphery of the opening end of the cap body 21; The aluminum connecting piece 4 is provided with a vent hole 41 , which is connected to the open end of the cap body 21 .

[0036] Specifically, in one embodiment, the cap 2 of the present invention is made of stainless steel, and the cap body 21 is a hollow structure with one end open, thereby reducing the overall weight of the cap body 21 and saving production costs.

[0037] In another embodiment, a ventilation hole 41 is provided on the aluminum connecting plate 4 to allow the gas generated by the battery cell 202 to pass through and enter the cavity of the cap body 21. The cap body 21 is a hollow structure with an open end, which can store more gas generated by the battery cell 202, reduce the pressure inside the battery 200, and avoid the occurrence of explosion accidents.

[0038] like Figure 2 As shown, in one embodiment, the thickness of the metal cover plate 1 is amm, and the value of a is: 0.1≤a≤0.3; The width of the first gap is b mm, and the value of b is: 1.0≤b≤2.0.

[0039] Specifically, the value of a is any point value among 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3mm, or a range value consisting of any two point values; in one embodiment, the value of a is 0.15mm-0.25mm.

[0040] When the value of a is: 0.1≤a≤0.3, it has the technical effect of optimal strength and optimal space utilization; when the value of a is less than 0.1, it will lead to poor strength and easy deformation or local collapse; when the value of a is greater than 0.3, the thickness of the component will occupy too much space, resulting in insufficient utilization of the cavity space of the product and low capacity density of Battery 200.

[0041] Specifically, the value of b is any point value among 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2.0mm, or a range value consisting of any two point values; in one embodiment, the value of b is 1.2mm-1.8mm.

[0042] When the value of b is: 1.0≤a≤2.0, it has the best technical effect of composite bonding strength; when the value of b is less than 1.0, it will lead to insufficient bonding area and substandard bonding strength; when the value of b is greater than 2.0, it will lead to an unbalanced ratio between the bonding film and the cap and cover plate, and insufficient strength.

[0043] like Figure 2 As shown, in one embodiment, the distance between the inner periphery and the outer periphery of the second film 32 is cmm, and the value of c is: 0.1≤c≤0.3; the thickness of the second film 32 is dmm, and the value of d is: 0.2≤d≤0.4.

[0044] Specifically, the value of c is any point value among 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3mm, or a range value consisting of any two point values; in one embodiment, the value of c is 0.15mm-0.25mm.

[0045] When the value of c is: 0.1≤C≤0.3, it has the optimal thickness range, easy to glue and sufficient strength. When the value of c is less than 0.1, the thickness of the glue will be insufficient, resulting in uneven thickness distribution, and its strength is difficult to guarantee. When the value of c is greater than 0.3, the thickness of the glue will occupy too much cavity space, affecting the capacity.

[0046] Specifically, the value of d is any point value among 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm, or a range value consisting of any two point values; in one embodiment, the value of d is 0.25mm-0.35mm.

[0047] When the value of d is: 0.2≤d≤0.4, it has the best technical effect of composite bonding; when the value of d is less than 0.2, the bonding area will be insufficient and its strength will be limited; when the value of d is greater than 0.4, the glue leakage area will be too large and the production difficulty coefficient will be high.

[0048] like Figure 2 As shown, in one embodiment, the distance between the inner periphery and the outer periphery of the third film 33 is emm, and the value of e is: 0.5≤e≤1.0; the thickness of the third film 33 is fmm, and the value of f is: 0.1≤f≤0.3.

[0049] Specifically, the value of e is any point value among 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, or a range value consisting of any two point values; in one embodiment, the value of e is 0.6mm-0.8mm.

[0050] When the value of e is: 0.5≤e≤1.0, it has the optimal length-to-thickness ratio and achieves the best technical effect of bonding strength; when the value of e is less than 0.5, it will lead to insufficient bonding area and its bonding strength does not meet the standard; when the value of e is greater than 1.0, it will lead to insufficient bonding area and its bonding strength does not meet the standard.

[0051] Specifically, the value of f is any point value among 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3mm, or a range value consisting of any two point values; in one embodiment, the value of f is 0.15mm-0.25mm.

[0052] When the value of f is: 0.1≤f≤0.3, it has the technical effect of having a suitable ratio between bonding thickness and bonding area, and having both strength and easy preparation; when the value of f is less than 0.1, it will lead to insufficient glue thickness and uneven distribution, and its bonding strength is not guaranteed; when the value of f is greater than 0.3, it will lead to a large glue thickness, insufficient space utilization and thus affect the product capacity.

[0053] like Figure 2 As shown, in one embodiment, the distance between the inner periphery and the outer periphery of the fourth film 34 is gmm, and the value of g is: 0.6≤g≤1.0; the thickness of the fourth film 34 is hmm, and the value of h is: 0.1≤h≤0.3.

[0054] Specifically, the value of g is any point value among 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, or a range value consisting of any two point values; in one embodiment, the value of g is 0.7mm-0.9mm.

[0055] When the value of g is: 0.6≤g≤1.0, it has the technical effect of the optimal ratio of stiffness to strength; when the value of g is less than 0.6, it will lead to insufficient bonding area and strength; when the value of g is greater than 1.0, it will lead to insufficient stiffness and easy deformation.

[0056] Specifically, the value of h is any point value among 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3mm, or a range of any two point values; in one embodiment, the value of h is 0.15mm-0.25mm.

[0057] When the value of h is: 0.1≤h≤0.3, the appropriate glue thickness is used to achieve the optimal flatness and strength technical effects; when the value of h is less than 0.1, the colloid thickness will be insufficient and its strength will be weak; when the value of h is greater than 0.3, the local thickness of the colloid will be too thick, thus affecting the flatness of the colloid.

[0058] like Figure 2 As shown, in one embodiment, the distance between the outer periphery of the second film 32 and the outer periphery of the aluminum connecting sheet 4 is imm, and the value of i is: 0.3≤i≤0.8; The distance between the outer periphery of the second film 32 and the outer periphery of the metal cover plate 1 is j mm, and the value of j is: 0.3≤j≤1.5.

[0059] Specifically, the value of i is any point value among 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm, or a range of any two point values; in one embodiment, the value of i is 0.4mm-0.6mm.

[0060] When the value of i is: 0.3≤i≤0.8, it has the technical effect of suitable bonding area and insulation safety distance; when the value of i is less than 0.3, it will lead to insufficient bonding area and insufficient margin for safety insulation; when the value of i is greater than 0.8, the glue path will be too long and the consistency of glue thickness cannot be guaranteed.

[0061] Specifically, the value of j is any point value among 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, or a range value consisting of any two point values; in one embodiment, the value of j is 0.8mm-1.2mm.

[0062] When the value of j is: 0.3≤j≤1.5, the composite material has the best structure and the film has the best bonding technical effect with the upper and lower metal parts; when the value of j is less than 0.3, the manufacturability will be low; when the value of j is greater than 1.5, the proportion of the metal cover plate and the aluminum connecting plate will be unbalanced, resulting in deformation.

[0063] like Figure 3 As shown, in one embodiment, another aspect of the present invention provides a button battery 200, including a shell 201, a battery cell 202 and the cover structure 100 described in any of the above embodiments, the battery cell 202 is arranged in the shell 201, and the metal cover is sealed to cover the shell 201.

[0064] The shell 201 is a hollow structure with one end open. The battery cell 202 is placed in the shell 201 . The cover structure 100 is connected to the open end of the shell 201 to complete the assembly of the button battery 200 .

[0065] Specifically, a positive electrode ear is provided at one end of the battery cell 202 close to the cover structure 100, and a negative electrode ear is provided at one end of the battery cell 202 away from the cover structure 100. The positive electrode ear of the battery cell 202 is welded to the aluminum connecting piece 4, the negative electrode ear of the battery cell 202 is connected to the bottom of the shell 201, and the open end of the shell 201 is welded to the outer periphery of the metal cover 1.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate structure, characterized in that: It includes a metal cover plate, a cover cap, an adhesive film and an aluminum connecting piece; The metal cover is used to connect the negative electrode of the battery cell and to cover the shell of the button battery; The aluminum connecting piece is used to connect the positive electrode of the battery cell, and the metal cover plate, the cap and the adhesive film are arranged on the same side of the aluminum connecting piece; The metal cover plate is provided with a through hole, the cap is arranged in the through hole, the outer periphery of the cap and the inner wall of the through hole are spaced apart by a first gap, and the metal cover plate and the aluminum material connecting sheet are spaced apart by a second gap; The adhesive film includes a first film and a second film; the first film is in a hollow cylindrical shape and filled in the first gap; the second film is in an annular sheet structure and filled in the second gap; the inner periphery of the second film is connected to the outer periphery of the first end of the first film.

2. The cover plate structure according to claim 1, characterized in that: The outer periphery of the second film extends to the lower surface of the metal cover plate along the direction away from the axis of the cap body, and extends out of the outer periphery of the aluminum connecting sheet. The side of the second film facing the metal cover plate is bonded to the lower surface of the metal cover plate, and the side of the second film facing the aluminum connecting sheet is bonded to the upper surface of the aluminum connecting sheet.

3. The cover plate structure according to claim 1, characterized in that: The cap comprises a cap body and an eaves body, wherein the eaves body is an annular sheet structure, the cap body is a columnar structure, the inner periphery of the eaves body is connected to the outer periphery of one end of the cap body close to the aluminum connecting sheet, the outer periphery of the eaves body extends in a direction away from the cap body axis, and the lower surface of the eaves body abuts against the upper surface of the aluminum connecting sheet; The first gap is arranged between the outer periphery of the eaves body and the inner wall of the through hole, and the inner periphery of the first film is bonded to the outer periphery of the eaves body.

4. The cover plate structure according to claim 3, characterized in that: The adhesive film includes a third film, which is an annular sheet structure. The inner periphery of the third film is connected to the outer periphery of the second end of the first film. The outer periphery of the third film extends to the upper surface of the metal cover plate along a direction away from the axis of the cap body and is bonded to the upper surface of the metal cover plate.

5. The cover plate structure according to claim 4, characterized in that: The adhesive film includes a fourth film, which is an annular sheet structure. The outer periphery of the fourth film is connected to the inner periphery of the second end of the first film. The inner periphery of the fourth film extends to the upper surface of the eaves along the direction close to the axis of the cap body and is bonded to the upper surface of the eaves.

6. The cover plate structure according to claim 5, characterized in that: The upper surface of the fourth film is flush with the upper surface of the first film and the upper surface of the third film; the lower surface of the fourth film is flush with the upper surface of the second film; the lower surface of the eaves, the lower surface of the first film and the lower surface of the second film are flush.

7. The cover plate structure according to claim 3, characterized in that: The cap body is a hollow structure with one end open, and the eaves body is connected to the outer periphery of the open end of the cap body; The aluminum connecting piece is provided with an air hole, and the air hole is connected to the open end of the cap body.

8. The cover plate structure according to claim 1, characterized in that: The thickness of the metal cover plate is amm, and the value of a is: 0.1≤a≤0.3; The width of the first gap is b mm, and the value of b is: 1.0≤b≤2.

0.

9. The cover plate structure according to claim 1, characterized in that: The distance between the inner periphery and the outer periphery of the second film is cmm, and the value of c is: 0.1≤c≤0.3; the thickness of the second film is dmm, and the value of d is: 0.2≤d≤0.

4.

10. The cover plate structure according to claim 4, characterized in that: The distance between the inner periphery and the outer periphery of the third film is emm, and the value of e is: 0.5≤e≤1.0; the thickness of the third film is fmm, and the value of f is: 0.1≤f≤0.

3.

11. The cover plate structure according to claim 5, characterized in that: The distance between the inner periphery and the outer periphery of the fourth film is gmm, and the value of g is: 0.6≤g≤1.0; the thickness of the fourth film is hmm, and the value of h is: 0.1≤h≤0.

3.

12. The cover plate structure according to claim 2, characterized in that: The distance between the outer periphery of the second film and the outer periphery of the aluminum connecting piece is imm, and the value of i is: 0.3≤i≤0.8; The distance between the outer periphery of the second film and the outer periphery of the metal cover plate is j mm, and the value of j is: 0.3≤j≤1.

5.

13. A button battery, characterized in that: It comprises a shell, a battery cell and a cover plate structure as described in any one of claims 1 to 12, wherein the battery cell is arranged in the shell, and the metal cover plate is sealingly covered on the shell.

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