Cover plate structure and button cell

Abstract

The invention provides a cover plate structure which comprises a metal cover plate, a cover cap and an adhesive film, the metal cover plate is used for connecting a battery cell cathode, a through hole is formed in the middle of the metal cover plate, the cover cap is arranged in the through hole, the cover cap is used for connecting a battery cell anode and comprises a cap body and an eave body, and the periphery of the eave body and the inner wall of the through hole are arranged at intervals through a gap; the bonding film comprises a first film, the first film is in a hollow cylinder shape, the inner periphery of the first film is bonded with the outer periphery of the eave body, and the outer periphery of the first film is bonded with the inner wall of the through hole; according to the invention, the metal cover plate and the cover cap are bonded into a whole through the first film to form a battery cover plate structure, so that reliable insulation and sealing between the metal cover plate and the cover cap are ensured; the cover cap arranged in the through hole is directly used as the positive electrode output end, so that the use of a positive electrode terminal with a complex structure is avoided, the cover plate structure is simplified, and the weight and cost of the battery cover plate structure are reduced.

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 products such as wireless Bluetooth headsets (TWS). Steel shell button batteries usually include a cover plate, a shell and a battery cell. The battery cell is housed inside the shell. The cover plate is connected to the shell, and the shell is connected to the negative electrode of the battery cell. The cover plate structure includes a metal cover plate and an electrode terminal insulated and mounted on the metal cover plate. The electrode terminal is welded to the positive electrode ear of the battery cell. In the prior art, the connection structure between the metal cover plate and the positive terminal is relatively complicated, resulting in a complex cover plate structure of the existing steel shell button battery and more components; 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 metal cover plate and the cap of the existing button battery 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: On one hand, the present invention provides a cover plate structure, comprising a metal cover plate, a cover cap and an adhesive film, wherein the metal cover plate is used to connect the negative electrode of the battery cell and to cover the shell of the button battery, and a through hole is provided in the middle of the metal cover plate; The cap is arranged in the through hole, and the cap is used to connect the positive electrode of the battery cell; the cap includes a cap body and an eaves body, 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, and the outer periphery of the eaves body extends in a direction away from the axis of the cap body; the outer periphery of the eaves body is spaced apart from the inner wall of the through hole; The adhesive film includes a first film, the first film is in a hollow cylindrical shape, the inner periphery of the first film is bonded to the outer periphery of the eaves body, and the outer periphery of the first film is bonded to the inner wall of the through hole.

[0004] Optionally, the adhesive film includes a second film, which is an annular sheet structure, the inner periphery of the second film is connected to the outer periphery of the first end of the first film, and the outer periphery of the second film extends to the upper surface of the metal cover plate in a direction away from the axis of the cap body and is bonded to the upper surface of the metal cover plate.

[0005] Optionally, the adhesive film includes a third film, which is an annular sheet structure, the outer periphery of the third film is connected to the inner periphery of the first end of the first film, and the inner periphery of the third film extends along the direction close to the axis of the cap body to the upper surface of the eaves body and is bonded to the upper surface of the eaves body.

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

[0007] Optionally, the upper surface of the third film, the upper surface of the first film and the upper surface of the second film are flush; the lower surface of the third film is flush with the upper surface of the fourth film; the lower surface of the eaves, the lower surface of the first film and the lower surface of the fourth film are flush.

[0008] Optionally, the cap body is a hollow structure with one end open, and the eaves body is connected to the periphery of the open end of the cap body.

[0009] 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 gap is bmm, and the value of b is: 1.0≤b≤2.0.

[0010] Optionally, the distance between the inner periphery and the outer periphery of the second film is cmm, and the value of c is: 0.5≤c≤1.0; the thickness of the second film is dmm, and the value of d is: 0.1≤d≤0.3.

[0011] Optionally, the distance between the inner periphery and the outer periphery of the third film is emm, and the value of e is: 0.6≤e≤1.0; the thickness of the third film is fmm, and the value of f is: 0.1≤f≤0.3.

[0012] Optionally, the distance between the inner periphery and the outer periphery of the fourth film is gmm, and the value of g is: 0.5≤g≤2.0; the thickness of the fourth film is hmm, and the value of h is: 0.1≤h≤0.3.

[0013] 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 arranged in the shell, and the metal cover plate is sealingly covered on the shell.

[0014] According to the cover structure provided by the present invention, the outer periphery of the eaves of the cap is spaced apart from the inner wall of the through hole, and a first film is arranged between the outer periphery of the eaves of the cap and the inner wall of the through hole, and the metal cover and the cap are bonded to form a whole through the first film, which are integrated into a battery cover structure, thereby ensuring reliable insulation and sealing between the metal cover and the cap; the cap arranged in the through hole is directly used as the positive output terminal, thereby avoiding the use of a positive terminal with a complex structure, simplifying the cover structure, and achieving weight reduction and cost reduction of the battery cover structure; at the same time, the first film of the present invention is filled between the outer periphery of the eaves and the inner wall of the through hole through a hot pressing process, thereby bonding the metal cover and the cap to form a whole, which are integrated into a battery cover structure; ensuring reliable insulation and sealing between the metal cover and the cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] 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-cover cap; 21-cap body; 22-eaves body; 3-adhesive film; 31-first film; 32-second film; 33-third film; 34-fourth film; 200-battery; 201-shell; 202-battery cell. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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 and an adhesive film 3; The metal cover plate 1 is used to connect the negative electrode of the battery cell 202 and to cover the shell of the button battery 200. A through hole 11 is provided in the middle of the metal cover plate 1. The cap 2 is arranged in the through hole 11, and the cap 2 is used to connect the positive electrode of the battery cell 202; the cap 2 includes a cap body 21 and an eaves body 22, the eaves body 22 is an annular sheet structure, the cap body 21 is a columnar structure, the inner periphery of the eaves body 22 is connected to the outer periphery of one end of the cap body 21, and the outer periphery of the eaves body 22 extends in a direction away from the axis of the cap body 21; the outer periphery of the eaves body 22 is spaced apart from the inner wall of the through hole 22; The adhesive film 3 is used to bond the metal cover plate 1 and the cap 2 ; the adhesive film 3 includes a first film 31 , which is in a hollow cylindrical shape, the inner periphery of the first film 31 is bonded to the outer periphery of the eaves 22 , and the outer periphery of the first film 31 is bonded to the inner wall of the through hole 11 .

[0021] 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, to ensure that the edge of the metal cover plate 1 has sufficient connection edge to be welded (or connected in other ways) to the shell of the button battery 200.

[0022] Specifically, the material of the adhesive film 3 of the present invention is epoxy resin glue or PP glue.

[0023] The cover plate structure 100 provided by the present invention sets the outer periphery of the eaves 22 of the cap 2 and the inner wall of the through hole 11 at intervals, and sets a first film 31 between the outer periphery of the eaves 22 of the cap 2 and the inner wall of the through hole 11, and the metal cover plate 1 and the cap 2 are bonded together by the first film 31 to form a whole, integrated into the cover plate structure 100, thereby ensuring reliable insulation and sealing between the metal cover plate 1 and the cap 2; the cap 2 set in the through hole 11 is directly used as the positive output terminal, thereby avoiding the use of a positive terminal with a complex structure, simplifying the cover plate structure 100, and achieving weight reduction and cost reduction of the cover plate structure 100.

[0024] Specifically, the first film 31 of the present invention is filled between the outer periphery of the eaves 22 and the inner wall of the through hole 11 through a hot pressing process, thereby bonding the metal cover plate 1 and the cap 2 to form a whole, integrating them into a cover plate structure 100, and ensuring reliable insulation and sealing between the metal cover plate 1 and the cap 2.

[0025] like Figure 1 As shown, in one embodiment, the adhesive film 3 includes a second film 32, the second film 32 is an annular sheet structure, the inner periphery of the second film 32 is connected to the outer periphery of the first end of the first film 31, and the outer periphery of the second film 32 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.

[0026] Specifically, the second film 32 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, and reducing the probability of deformation of the cover plate structure 100.

[0027] like Figure 1 As shown, in one embodiment, the adhesive film 3 includes a third film 33, which is an annular sheet structure. The outer periphery of the third film 33 is connected to the inner periphery of the first end of the first film 31, and the inner periphery of the third film 33 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.

[0028] Specifically, the third film 33 extends to the upper surface of the eaves 22 and bonds 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 plate, and reducing the probability of deformation of the cover plate structure 100.

[0029] like Figure 1 As shown, in one embodiment, the adhesive film 3 includes a fourth film 34, which is an annular sheet structure. The inner periphery of the fourth film 34 is connected to the outer periphery of the second end of the first film 31, and the outer periphery of the fourth film 34 extends along the direction away from the axis of the cap body 21 to the lower surface of the metal cover plate 1 and is bonded to the lower surface of the metal cover plate 1.

[0030] Specifically, the fourth film 34 extends to the lower surface of the metal cover plate 1 and bonds to the lower 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, which is beneficial for the external force on the cap 2 to be transmitted to the metal cover plate 1 during the use of the battery 200 (such as when it falls or is hit), thereby extending the service life of the cover plate structure 100.

[0031] Furthermore, the fourth film 34 extends to the lower surface of the metal cover plate 1 and adheres to the lower surface of the metal cover plate 1, which can prevent the lower surface of the metal cover plate 1 from contacting the positive electrode ear of the battery cell 202 and avoid short circuit of the battery 200.

[0032] like Figure 1 As shown, in one embodiment, the upper surface of the third film 33, the upper surface of the first film 31 and the upper surface of the second film 32 are flush; the lower surface of the third film 33 is flush with the upper surface of the fourth film 34; the lower surface of the eaves 22, the lower surface of the first film 31 and the lower surface of the fourth film 34 are flush, and the eaves 22 and the metal cover 1 are staggered, which is beneficial to buffer the non-axial force of the cap 2. Compared with the second film 32 and the fourth film 34, the thickness of the first film 31 and the thickness of the third film 33 are increased, which is beneficial to increase the bonding reliability of the adhesive film 3 to the metal cover 1, and is beneficial to reduce the internal space of the button battery 200 occupied by the cover structure 100, ensuring reliable insulation between the metal cover 1 and the cap 2 and the positive electrode of the battery cell 202.

[0033] like Figure 1 As shown, in one embodiment, the cap body 21 is a hollow structure with one end open, and the eaves body 22 is connected to the outer periphery of the open end of the cap body 21 .

[0034] Specifically, 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. At the same time, the hollow portion inside the cap body 21 can also be used as a gas storage space to store the gas generated during the use of the battery 200.

[0035] 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 gap is bmm, and the value of b is: 1.0≤b≤2.0.

[0036] 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-0.2mm.

[0037] 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.

[0038] 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.

[0039] When the value of b is: 1.0≤b≤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 adhesion; when the value of b is greater than 2.0, it will lead to an unbalanced ratio between the adhesive film and the cap and cover plate, and insufficient strength.

[0040] 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: 0.5≤c≤1.0; the thickness of the second film 32 is dmm, and the value of d is: 0.1≤d≤0.3.

[0041] Specifically, the value of c 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 c is 0.7mm-0.9mm.

[0042] When the value of c is: 0.5≤c≤1.0, it has the optimal length-to-thickness ratio and achieves the best technical effect of bonding strength; when the value of c 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 c is greater than 1.0, the bonding film will be too long and the film thickness will be uneven, which will affect the bonding strength.

[0043] Specifically, the value of d 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 d is 0.15mm-0.2mm.

[0044] When the value of d is: 0.1≤b≤0.3, it has the technical effect of having a suitable ratio of bonding thickness to bonding area, and having both strength and easy preparation; when the value of d 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 d is greater than 0.3, it will lead to a large glue thickness, insufficient space utilization and thus affect the product capacity.

[0045] 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: 0.6≤e≤2.0; the thickness of the third film 33 is fmm, and the value of f is: 0.1≤f≤0.3.

[0046] Specifically, the value of e is any point value among 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, or a range value consisting of any two point values; in one embodiment, the value of e is 1mm-1.5mm.

[0047] When the value of e is: 0.6≤e≤2.0, it has the technical effect of the optimal ratio of stiffness to strength; when the value of e is less than 0.6, it will lead to insufficient bonding area and strength; when the value of e is greater than 2.0, it will lead to insufficient stiffness and easy deformation.

[0048] 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-0.2mm.

[0049] When the value of f is: 0.1≤f≤0.3, it has the technical effect of both flatness and strength; when the value of f is less than 0.1, it will lead to insufficient rigidity and easy deformation; when the value of f is greater than 0.3, it will lead to excessive hardness and high elasticity, and the production molding difficulty coefficient is high and easy to rebound.

[0050] 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: 0.5≤g≤1.5; the thickness of the fourth film 34 is hmm, and the value of h is: 0.1≤h≤0.3.

[0051] Specifically, the value of g is any point value among 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 g is 0.8mm-1.2mm.

[0052] When the value of g is: 0.5≤g≤1.5, it has the best technical effect of composite bonding; when the value of g is less than 0.5, the bonding area will be insufficient and its strength will be limited; when the value of g is greater than 1.5, the glue leakage area will be too large and the production difficulty coefficient will be high.

[0053] 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-0.2mm.

[0054] When the value of h is: 0.1≤h≤0.3, it has the optimal thickness range, easy to glue and sufficient strength to achieve the technical effect; when the value of h is less than 0.1, it will lead to insufficient glue thickness and uneven thickness distribution, and its strength is difficult to guarantee; when the value of h is greater than 0.3, the glue thickness will occupy too much cavity space, affecting the capacity.

[0055] like Figure 3 As shown, in one embodiment, the present invention provides a button battery 200, including a shell 201, a battery cell 202 and the cover structure 100 as described above, the battery cell 202 is arranged in the shell 201, and the metal cover is sealed to cover the shell 201.

[0056] The battery 200 of the present invention is a button battery 200. The battery 200 of the present invention also includes a battery cell 202 and a shell 201. The shell 201 is a hollow structure with one end open. The battery cell 202 is placed in the shell 201. The electrolyte is injected into the shell 201. The cover structure 100 is connected to the open end of the shell 201 to complete the battery cell 202 process.

[0057] Specifically, a positive pole ear is provided at one end of the battery cell 202 close to the cover structure 100, and a negative pole ear is provided at one end of the battery cell 202 away from the cover structure 100. The positive pole ear of the battery cell 202 is welded to the cap 2, the negative pole 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 side of the metal cover 1 close to the battery cell 202.

[0058] 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: Including metal cover plate, cover cap and adhesive film; The metal cover is used to connect the negative electrode of the battery cell and to cover the shell of the button battery. A through hole is provided in the middle of the metal cover; The cap is arranged in the through hole, and the cap is used to connect the positive electrode of the battery cell; the cap includes a cap body and an eaves body, 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, and the outer periphery of the eaves body extends in a direction away from the axis of the cap body; the outer periphery of the eaves body is spaced apart from the inner wall of the through hole; The adhesive film includes a first film, the first film is in a hollow cylindrical shape, the inner periphery of the first film is bonded to the outer periphery of the eaves body, and the outer periphery of the first film is bonded to the inner wall of the through hole.

2. The cover plate structure according to claim 1, characterized in that: The adhesive film includes a second film, which is an annular sheet structure. The inner periphery of the second film is connected to the outer periphery of the first end of the first film. The outer periphery of the second 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.

3. The cover plate structure according to claim 2, characterized in that: The adhesive film includes a third film, which is an annular sheet structure. The outer periphery of the third film is connected to the inner periphery of the first end of the first film. The inner periphery of the third 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.

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

5. The cover plate structure according to claim 4, characterized in that: The upper surface of the third film is flush with the upper surface of the first film and the upper surface of the second film; the lower surface of the third film is flush with the upper surface of the fourth film; the lower surface of the eaves, the lower surface of the first film and the lower surface of the fourth film are flush.

6. The cover plate structure according to claim 1, 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.

7. 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 gap is bmm, and the value of b is: 1.0≤b≤2.

0.

8. The cover plate structure according to claim 2, 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: 0.5≤c≤1.0; the thickness of the second film is dmm, and the value of d is: 0.1≤d≤0.

3.

9. The cover plate structure according to claim 3, 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: 0.6≤e≤1.0; the thickness of the third film is fmm, and the value of f is: 0.1≤f≤0.

3.

10. The cover plate structure according to claim 4, 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: 0.5≤g≤2.0; the thickness of the fourth film is hmm, and the value of h is: 0.1≤h≤0.

3.

11. 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 10, wherein the battery cell is arranged in the shell, and the metal cover plate is sealingly covered on the shell.

Images