Button type lithium ion battery, cover plate, shell and electronic product

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a button type lithium ion battery, a cover plate, a shell and an electronic product. The cover plate assembly comprises an aluminum outer cover plate, an insulating layer and a copper inner cover plate, the centers of the aluminum outer cover plate and the insulating layer are respectively provided with through holes which are opposite to each other, the aperture of the through hole of the insulating layer is equal to or smaller than that of the through hole of the aluminum outer cover plate, and the copper inner cover plate seals the through holes of the aluminum outer cover plate and the insulating layer. The insulating layer is spaced between the aluminum outer cover plate and the copper inner cover plate in an insulating manner, the two surfaces of the insulating layer are respectively combined with the surfaces of the aluminum outer cover plate and the copper inner cover plate in a sealing manner, and the top surface and the bottom surface of the copper inner cover plate are respectively exposed out of the top surface and the bottom surface of the cover plate assembly in an area of the copper inner cover plate, which is opposite to the through holes of the aluminum outer cover plate and the insulating layer; the periphery of the aluminum outer cover plate exceeds the peripheries of the insulating layer and the copper inner cover plate, and the outer edge of the aluminum outer cover plate is the outer edge of the cover plate assembly. By adopting the technical scheme, the magnetization risk of button lithium ions can be reduced, and the application reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, in particular to a button-type lithium-ion battery, a cover plate, a shell and an electronic product. Background Art

[0002] As the application of smart wearable products becomes more and more widespread, people's demand for small-sized button-type secondary rechargeable batteries (referred to as button-type lithium-ion batteries) is also increasing.

[0003] Button lithium-ion batteries are currently the most widely used type, and are increasingly used in smart wearable products, medical products, military products, etc.

[0004] The inventor discovered during the research process of the present utility model that the existing button-type lithium-ion batteries have certain magnetism or weak magnetism, and there is certain electromagnetic interference, which is not conducive to the safe use of electronic products. Summary of the invention

[0005] One of the purposes of the embodiments of the present utility model is to provide a button-type lithium-ion battery, a cover plate, a housing, and an electronic product. The use of this technical solution is conducive to reducing the magnetization risk of the button-type lithium-ion battery and improving application reliability.

[0006] In a first aspect, the present embodiment provides a cover plate assembly suitable for a button-type lithium-ion battery, comprising an aluminum outer cover plate, an insulating layer, and a copper inner cover plate.

[0007] Wherein, opposite through holes are respectively arranged at the centers of the aluminum outer cover plate and the insulating layer, and the aperture of the through hole of the insulating layer is equal to or smaller than the aperture of the through hole of the aluminum outer cover plate.

[0008] The copper inner cover plate seals the through holes of the aluminum outer cover plate and the insulating layer, the insulating layer is insulated between the aluminum outer cover plate and the copper inner cover plate, and the two surfaces of the insulating layer are sealed and combined with the surfaces of the aluminum outer cover plate and the copper inner cover plate respectively.

[0009] In the area of ​​the copper inner cover plate facing the through holes of the aluminum outer cover plate and the insulating layer: the top surface and the bottom surface of the copper inner cover plate are exposed to the top surface and the bottom surface of the cover plate assembly respectively,

[0010] The outer periphery of the aluminum outer cover plate exceeds the outer periphery of the insulating layer and the copper inner cover plate, and the outer edge of the aluminum outer cover plate is the outer edge of the cover plate assembly.

[0011] Optionally, the copper inner cover plate is sealed and bonded to the bottom surface of the aluminum outer cover plate through the insulating layer, and the bottom surface of the copper inner cover plate is completely exposed from the bottom surface of the cover plate assembly.

[0012] The area of ​​the copper inner cover plate facing the through holes of the aluminum outer cover plate and the insulating layer protrudes toward the top to form a boss on the top surface of the copper inner cover plate that is confined within the through holes of the aluminum outer cover plate and the insulating layer, and the top of the boss is exposed on the top surface of the cover plate assembly.

[0013] Optionally, a concave position is formed on the bottom surface of the copper inner cover plate, and the concave position is limited to the through hole of the aluminum outer cover plate and the insulating layer.

[0014] Optionally, the copper inner cover plate is made of a copper plate with uniform thickness.

[0015] Optionally, the boss located on the top surface of the copper inner cover plate and the recess located on the bottom surface are formed by stamping.

[0016] Optionally, the aluminum outer cover plate is made of an aluminum plate with uniform thickness, and / or the insulating layer is made of a film with uniform thickness.

[0017] Optionally, the copper inner cover plate is sealed and bonded to the top surface of the aluminum outer cover plate through the insulating layer.

[0018] The top surface of the copper inner cover plate is completely exposed on the top surface of the cover plate assembly, and the bottom surface of the copper inner cover plate is exposed on the bottom surface of the cover plate assembly through the through holes of the aluminum outer cover plate and the insulating layer.

[0019] In a fourth aspect, the shell for a button-type lithium-ion battery provided by an embodiment of the present utility model includes:

[0020] Any of the above-mentioned cover plate assemblies,

[0021] The top is an open aluminum shell.

[0022] The bottom surface of the outer edge of the aluminum outer cover plate of the cover plate assembly is sealed with the metal of the shell wall end surface at the opening of the aluminum shell by melting, forming a sealed chamber between the aluminum shell and the cover plate assembly for accommodating the battery cell of the lithium-ion battery.

[0023] Optionally, an injection hole is provided in the area of ​​the aluminum outer cover plate located at the periphery of the insulating layer and the copper inner cover plate, or at the bottom of the aluminum shell, and an aluminum sheet is tightly attached to the injection hole, and a closed annular sealing track is formed on the aluminum sheet. At the closed annular sealing track, the aluminum sheet and the aluminum material surface to which the aluminum sheet is tightly attached are molten and sealed, and the injection hole is sealed within the closed annular sealing track.

[0024] In a third aspect, the button-type lithium-ion battery provided by the embodiment of the utility model comprises:

[0025] The above-mentioned housing,

[0026] The battery cell is sealed in the shell, the positive electrode of the battery cell is an aluminum tab, and the negative electrode is a copper tab. The aluminum tab is welded to the inner wall of the aluminum shell or the bottom surface of the aluminum outer cover, and the copper tab is welded to the bottom surface of the copper inner cover plate.

[0027] In a fourth aspect, an embodiment of the utility model provides an electronic product, which includes: a battery compartment, in which the above-mentioned button-type lithium-ion battery is arranged to drive a circuit module of the electronic product.

[0028] As can be seen from the above, the cover assembly of this embodiment is used as the electrode assembly of the button-type lithium-ion battery. Compared with the cover made of steel plate in the prior art, the cover assembly of this embodiment is non-magnetic or weakly magnetic. When used in electronic products, it is not easy to be magnetized, which is beneficial to ensure the normal operation of the electronic products.

[0029] The shell of the button-type lithium-ion battery of this embodiment is an aluminum shell, and the pole ears of the battery cell are respectively aluminum pole ears and copper pole ears. Compared with the steel shell button-type lithium-ion battery in the prior art, the button-type lithium-ion battery of this embodiment does not contain magnetic or weakly magnetic materials, and will not be magnetized when used in electronic products, which is beneficial to ensure the normal operation of electronic products.

[0030] capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute an improper limitation of the present invention.

[0032] Figure 1 A schematic diagram of a top view of a cover plate provided in Example 1 of the utility model;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure of the cover plate as viewed from above;

[0034] Figure 3 for Figure 1 A three-dimensional schematic diagram of the exploded structure of the cover plate shown;

[0035] Figure 4 for Figure 3 A schematic diagram of the exploded structure of the cover plate shown;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of a button-type lithium-ion battery provided in Example 1 of the utility model;

[0037] Figure 6 for Figure 5 A schematic perspective view of the exploded structure of the shell of a button-type lithium-ion battery shown;

[0038] Figure 7 for Figure 6 The schematic diagram of the exploded structure of the shell of the button-type lithium-ion battery shown is a front view.

[0039] 1: Aluminum outer cover plate; 11: First through hole; 2: Copper inner cover plate; 21: Boss;

[0040] 3: insulation layer; 31: second through hole; 4: aluminum shell; 41: injection hole;

[0041] 5: Aluminum sheet. DETAILED DESCRIPTION

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0043] Examples of embodiments of the present invention described in detail below 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.

[0044] The embodiments described below with reference to the drawings attached to this specification are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "length", "width", "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 should not be construed as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example 1.

[0048] See also Figure 1-7 .

[0049] This embodiment provides a cover plate assembly suitable for button-type lithium-ion batteries. The cover plate assembly includes: an aluminum cover plate made of aluminum, a copper cover plate made of copper, and an insulating layer 3, wherein the outer periphery of the aluminum cover plate 1 is the outer periphery of the cover plate assembly, and the copper cover plate 2 is located within the outer periphery of the aluminum cover plate 1, so they are respectively recorded as the aluminum outer cover plate 1 and the copper inner cover plate 2 below.

[0050] A through hole is respectively provided at the center of the aluminum outer cover plate 1 and the insulating layer 3, which are respectively denoted as the first through hole 11 and the second through hole 31, wherein the aperture of the first through hole 11 of the aluminum outer cover plate 1 is equal to or preferably narrower than the aperture of the second through hole 31 of the insulating layer, so that the inner edge of the second through hole 31 of the insulating layer is flush with the inner edge of the first through hole 11 or preferably extends one circle inside the outer edge of the inner edge of the first through hole 11, so as to strengthen the insulating spacing between the insulating layer 3 and the aluminum outer cover plate 1 and the copper inner cover plate 2.

[0051] During assembly, the second through hole 31 of the insulating layer 3 is aligned with the center of the first through hole 11 of the aluminum outer cover plate 1, and the insulating layer 3 is stacked between the aluminum outer cover plate 1 and the copper inner cover plate 2 to form a three-layer stacked structure to form a cover plate assembly.

[0052] In the cover plate assembly, the two surfaces of the insulating layer 3 outside the second through hole 31 are sealed and integrated with the surfaces of the aluminum outer cover plate 1 and the copper inner cover plate 2 that are in contact with the surfaces, respectively, to form an integrated cover plate assembly structure.

[0053] On the cover assembly, at least in the top and bottom areas facing the first through hole 11: the top surface of the copper inner cover plate 2 is exposed on the top surface of the cover assembly, and the bottom surface of the copper inner cover plate 2 is exposed on the bottom surface of the cover assembly. The outer edges of the aluminum outer cover plate 1 located at the periphery of the copper inner cover plate 2 and the insulating layer 3 are exposed on the top and bottom surfaces of the cover assembly. When applied to button-type lithium-ion batteries, the aluminum outer cover plate 1 and the copper inner cover plate 2 of the cover assembly are used as the two electrodes of the button-type lithium-ion battery, which are electrically connected to the circuit module of the external electronic product to provide power.

[0054] As an illustration of this embodiment, Figure 1-7As shown, a boss 21 protruding toward the top can be provided in the central area of ​​the copper inner cover plate 2. When stacking, the copper inner cover plate 2 is stacked and sealed on the bottom surface of the aluminum outer cover plate 1 through the insulating layer 3, so that the boss 21 of the copper inner cover plate 2 faces the first through hole 11 and the second through hole 31 of the aluminum outer cover plate 1 and the insulating layer 3. The boss 21 is limited in the second through hole 31 and exposed to the top surface of the aluminum outer cover plate 1 through the second through hole 31, that is, exposed to the top surface of the cover plate assembly, so as to be connected to the outside as the electrode of the button battery. The bottom surface of the copper inner cover plate 2 is completely exposed to the bottom surface of the cover plate assembly, so as to electrically connect the electrodes of the lithium ion battery cell located inside the shell of the button lithium ion battery.

[0055] As an illustration of this embodiment, the copper inner cover plate 2 of this embodiment can be made of, but is not limited to, a copper plate of uniform thickness. After the sheet-like insulating layer 3 and the copper inner cover plate 2 are stacked on the bottom surface of the aluminum outer cover plate 1, the copper inner cover plate 2 is made to cover the first through hole 11 and the second through hole 31 with interference fit. The top surface of the cover plate assembly is punched from the bottom surface of the copper inner cover plate 2 facing the first through hole 11 and the second through hole 31, so that the punched area of ​​the copper inner cover plate 2 is deformed and bent upward into the first through hole 11 and the second through hole 31. A boss 21 limited to the first through hole 11 and the second through hole 31 is formed on the top surface of the copper inner cover plate 2. The boss 21 is used as the external electrode of the button-type lithium-ion battery. A concave position that is recessed into the first through hole 11 and the second through hole 31 is formed on the bottom surface of the copper inner cover plate 2 (i.e., the bottom surface of the boss 21) (because the edge of the concave position is curved, Figure 3 (not shown) to serve as the lug welding space for the battery cell of the lithium-ion battery. With this solution, the copper inner cover plate 2 is located on the bottom surface of the aluminum outer cover plate 1, and is located inside the shell of the button-type lithium-ion battery. During the use of the button-type lithium-ion battery, the air pressure inside the shell of the button-type lithium-ion battery increases. Under the action of the internal air pressure, the copper inner cover plate 2 has the pressure to further cling to the bottom surface of the aluminum outer cover plate 1, and the tightness of the connection between the aluminum outer cover plate 1 and the copper inner cover plate 2 in the cover plate assembly is further improved, which is beneficial to improving the sealing performance of the cover plate assembly. In addition, a recess for electrode welding is formed on the bottom surface of the copper inner cover plate 2, and space for electrode welding is reserved on the cover plate assembly without occupying the space inside the shell of the button-type lithium-ion battery, which is beneficial to improving the space utilization rate inside the shell and increasing the capacity of the button-type lithium-ion battery.

[0056] As an illustration of this embodiment, the aluminum cover plate 1 may be made of, but not limited to, an aluminum plate with uniform thickness (preset with first through holes 11 ). The insulating layer 3 may be made of, but not limited to, a film with uniform thickness (preset with second through holes 31 ).

[0057] The colloids on both surfaces of the insulating layer 3 can be melted into a fluid by hot pressing, and the surfaces of the aluminum outer cover plate 1 and the copper inner cover plate 2 in contact with the insulating layer 3 are fully sealed and combined together, and then cooled and formed to obtain a thermally composited cover plate assembly.

[0058] In addition, the technical solution of sealing and bonding the copper inner cover plate 2 to the top surface of the aluminum outer cover plate 1 through the insulating layer 3 can also be used but is not limited thereto. In this way, the top surface of the copper inner cover plate 2 is completely exposed to the top surface of the cover plate assembly, and the bottom surface of the copper inner cover plate 2 is exposed to the bottom surface of the cover plate assembly through the first through hole 11 and the second through hole 31, and is electrically connected to the electrodes of the battery cell in the button-type lithium-ion battery.

[0059] As can be seen from the above, the cover assembly of this embodiment is used as the electrode assembly of the button-type lithium-ion battery. Compared with the cover made of steel plate in the prior art, the cover assembly of this embodiment is non-magnetic or weakly magnetic. When used in electronic products, it is not easy to be magnetized, which is beneficial to ensure the normal operation of the electronic products.

[0060] When the cover plate assembly of the present embodiment is applied to the shell of a button-type lithium-ion battery, an aluminum shell 4 with an opening at the top is used as the main body of the shell. The cover plate assembly of the present embodiment seals the opening at the top of the aluminum shell 4 as an illustration of the present embodiment. The metal shell 1 can be formed by stamping a thinner aluminum plate, but is not limited to it. The shell wall thickness of the aluminum shell 4 is the thickness of the aluminum plate, and the stamping opening is used as the opening of the aluminum shell 4. The cover plate assembly is sealed on the opening of the aluminum shell 4, specifically, the bottom surface of the outer edge of the aluminum outer cover plate 1 and the end surface of the lateral shell wall at the opening of the aluminum shell 4 are metal-melted and sealed (for example, but not limited to ultrasonic welding or laser welding), and a sealed chamber for accommodating the battery cell (including electrolyte and electrolyte) of the lithium-ion battery is formed between the aluminum shell 4 and the cover plate assembly.

[0061] The assembly principle of button-type lithium-ion battery is to place the battery cell of button-type lithium-ion battery into aluminum shell 4, weld the copper pole ear made of copper foil as the positive pole ear of the battery cell to the bottom surface of copper inner cover plate 2, weld the aluminum pole ear made of aluminum foil as the negative pole ear of the battery cell to the bottom surface of aluminum outer cover plate 1 near the outer edge of insulating layer 3 (or weld to the inner wall of aluminum shell 4), and then seal the aluminum cover plate 1 of the combined cover to the opening of aluminum shell 4, so as to obtain button-type lithium-ion battery. Aluminum shell 4 and aluminum outer cover plate 1 are used as the negative pole of button-type lithium-ion battery, and copper inner cover plate 2 is used as the positive pole of button-type lithium-ion battery.

[0062] The technical solution of this embodiment is applicable to both battery cells using solid electrolytes and battery cells using electrolytes as electrolytes. When electrolytes are used, after the battery cells are placed in the aluminum shell 4 and the tabs are connected, the electrolyte is poured from the opening of the aluminum shell 4, and after the pouring, the aluminum cover plate 1 is further sealed.

[0063] As an illustration of this embodiment, it is also preferred but not limited to setting a vertically through hole portion as an injection hole 41 for electrolyte injection in the area of ​​the aluminum outer cover plate 1 of the cover plate assembly located on the periphery of the insulating layer 3, so that the aluminum outer cover plate 1 can seal the opening of the aluminum shell 4 before the electrolyte is injected, and then the electrolyte is injected into the shell through the injection hole 41. After the electrolyte injection is completed, the aluminum sheet is used to cover the injection hole 41 with an interference fit, so that the bottom surface of the aluminum sheet is sealed with the top surface of the cover outer plate to seal the injection hole 41. For example, but not limited to, a closed annular sealing track is formed on the aluminum sheet, and the injection hole 41 is located in the closed annular sealing track. At the position of the closed annular sealing track, the bottom surface of the aluminum sheet and the top surface of the aluminum cover outer plate are sealed and integrated by metal melting.

[0064] As an illustration of this embodiment, it is also possible to Figure 6 , 7 As shown, the injection hole 41 is arranged at the bottom of the aluminum shell 4, and the aluminum sheet for sealing the injection hole 41 is correspondingly arranged on the bottom surface of the bottom of the aluminum shell 4. The sealing method is as described above and will not be described in detail here.

[0065] The button-type lithium-ion battery of this embodiment can be applied to various electronic products. By placing the button-type lithium-ion battery in the power compartment of the electronic product so that the positive and negative electrodes of the battery are electrically connected to the preset electrode terminals on the power compartment, current can be provided for the circuit module of the electronic product.

[0066] As can be seen from the above, the shell of the button-type lithium-ion battery of this embodiment is an aluminum shell 4, and the pole ears of the battery cell are respectively aluminum pole ears and copper pole ears. Compared with the steel shell button-type lithium-ion battery in the prior art, the button-type lithium-ion battery of this embodiment does not contain magnetic or weakly magnetic materials, and will not be magnetized when used in electronic products, which is beneficial to ensure the normal operation of electronic products.

[0067] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A cover plate assembly suitable for a button-type lithium-ion battery, characterized in that: include, Aluminum outer cover, insulation layer and copper inner cover, Wherein, opposite through holes are respectively arranged at the centers of the aluminum outer cover plate and the insulating layer, and the aperture of the through hole of the insulating layer is equal to or smaller than the aperture of the through hole of the aluminum outer cover plate. The copper inner cover plate seals the through holes of the aluminum outer cover plate and the insulating layer, the insulating layer is insulated between the aluminum outer cover plate and the copper inner cover plate, and the two surfaces of the insulating layer are sealed and combined with the surfaces of the aluminum outer cover plate and the copper inner cover plate respectively. In the area of ​​the copper inner cover plate facing the through holes of the aluminum outer cover plate and the insulating layer: the top surface and the bottom surface of the copper inner cover plate are exposed to the top surface and the bottom surface of the cover plate assembly respectively, The outer periphery of the aluminum outer cover plate exceeds the outer periphery of the insulating layer and the copper inner cover plate, and the outer edge of the aluminum outer cover plate is the outer edge of the cover plate assembly.

2. The cover plate assembly of the button-type lithium-ion battery according to claim 1, characterized in that: The copper inner cover plate is sealed and bonded to the bottom surface of the aluminum outer cover plate through the insulating layer, and the bottom surface of the copper inner cover plate is completely exposed from the bottom surface of the cover plate assembly. The area of ​​the copper inner cover plate facing the through holes of the aluminum outer cover plate and the insulating layer protrudes toward the top to form a boss on the top surface of the copper inner cover plate that is confined within the through holes of the aluminum outer cover plate and the insulating layer, and the top of the boss is exposed on the top surface of the cover plate assembly.

3. The cover plate assembly of the button-type lithium-ion battery according to claim 2, characterized in that: A concave position is formed on the bottom surface of the copper inner cover plate, and the concave position is limited in the through hole of the aluminum outer cover plate and the insulating layer.

4. The cover plate assembly of the button-type lithium-ion battery according to claim 3, characterized in that: The copper inner cover plate is made of a copper plate with uniform thickness.

5. The cover plate assembly of the button-type lithium-ion battery according to claim 4, characterized in that: The boss located on the top surface of the copper inner cover plate and the recess located on the bottom surface are formed by stamping.

6. The cover plate assembly of the button-type lithium-ion battery according to claim 1, characterized in that: The aluminum outer cover plate is made of an aluminum plate with uniform thickness, and / or the insulating layer is made of a film with uniform thickness.

7. The cover plate assembly of the button-type lithium-ion battery according to claim 1, characterized in that: The copper inner cover plate is sealed and bonded to the top surface of the aluminum outer cover plate through the insulating layer. The top surface of the copper inner cover plate is completely exposed on the top surface of the cover plate assembly, and the bottom surface of the copper inner cover plate is exposed on the bottom surface of the cover plate assembly through the through holes of the aluminum outer cover plate and the insulating layer.

8. A shell suitable for a button-type lithium-ion battery, characterized in that: include: The cover plate assembly according to any one of claims 1 to 7, The top is an open aluminum shell. The bottom surface of the outer edge of the aluminum outer cover plate of the cover plate assembly is sealed with the metal of the shell wall end surface at the opening of the aluminum shell by melting, forming a sealed chamber between the aluminum shell and the cover plate assembly for accommodating the battery cell of the lithium-ion battery.

9. A button-type lithium-ion battery, characterized in that: include, The housing according to claim 8, The battery cell is sealed in the shell, the positive electrode of the battery cell is an aluminum tab, and the negative electrode is a copper tab. The aluminum tab is welded to the inner wall of the aluminum shell or the bottom surface of the aluminum outer cover, and the copper tab is welded to the bottom surface of the copper inner cover plate.

10. An electronic product, characterized in that: include: A battery compartment, in which the button-type lithium-ion battery according to claim 9 is arranged to drive the circuit module of the electronic product.

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