A button cell

Abstract

This invention proposes a coin cell battery, comprising a casing, a top cover assembly, and an electrode core, with a semi-closed structure open at one end. The top cover assembly closes the opening of the casing, forming a cavity between the top cover assembly and the casing for accommodating the electrode core. The top cover assembly includes a first electrode plate, a second electrode plate, and an insulating sealant. The insulating sealant includes a first sealing sheet, a second sealing sheet, and a connector. The connector is disposed between the first and second sealing sheets and connects them. A first groove is formed on the inner side of the connector and between the first and second sealing sheets, and the outer edge of the first electrode plate is accommodated in the first groove. A second groove is formed on the outer side of the connector and between the first and second sealing sheets, and the inner edge of the second electrode plate is accommodated in the second groove. The coin cell battery of this invention achieves reliable insulation and sealing through the provision of the insulating sealant.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more particularly to a button cell battery. Background Technology

[0002] With the increasing prevalence of smart wearable products, the demand for small-sized lithium-ion button-type rechargeable batteries (referred to as button lithium-ion batteries) is also growing. Button lithium-ion batteries are increasingly used in smart wearable products, such as wireless Bluetooth headsets. As their application expands, the requirements for these batteries are becoming more stringent. Existing button batteries require insulation and sealing in the top cover and casing, but their sealing performance is currently relatively poor. Summary of the Invention

[0003] The purpose of this invention is to address the problem of poor insulation and sealing performance of existing button cell batteries by providing a button cell battery.

[0004] This invention provides a button cell battery, including a casing, a top cover assembly, and an electrode core. The casing is a semi-closed structure with one open end. The top cover assembly closes the opening of the casing to form a cavity for accommodating the electrode core between the top cover assembly and the casing. The top cover assembly includes a first electrode plate, a second electrode plate, and an insulating seal. The outer periphery of the second electrode plate is connected to the edge of the opening of the casing, and a through hole is provided on the second electrode plate. The first electrode plate is installed in the through hole through the insulating seal. The insulating seal includes a first sealing sheet, a second sealing sheet, and a connector. The connector is disposed between the first sealing sheet and the second sealing sheet and connects the first sealing sheet and the second sealing sheet. A first groove is formed on the inner side of the connector and between the first sealing sheet and the second sealing sheet, and the outer edge of the first electrode plate is accommodated in the first groove. A second groove is formed on the outer side of the connector and between the first sealing sheet and the second sealing sheet, and the inner edge of the second electrode plate is accommodated in the second groove. The electrode core is electrically connected to the first electrode plate and the second electrode plate, and / or the electrode core is electrically connected to the first electrode plate and the casing.

[0005] Optionally, the top cover assembly further includes a waterproof membrane disposed on the side of the first sealing sheet away from the cavity.

[0006] Optionally, the side of the first electrode plate facing away from the cavity and the side of the second electrode plate facing away from the cavity are respectively sealed to one side surface of the first sealing sheet; the side of the first electrode plate facing the cavity and the side of the second electrode plate facing the cavity are respectively sealed to one side surface of the second sealing sheet.

[0007] Optionally, the through hole is a circular hole, and both the first sealing sheet and the second sealing sheet are annular sheets; the waterproof membrane is annular, the center lines of the waterproof membrane and the first sealing sheet coincide, the inner diameter of the waterproof membrane is larger than the inner diameter of the first sealing sheet, and the outer diameter of the waterproof membrane is smaller than the outer diameter of the first sealing sheet.

[0008] Optionally, the connector is an annular component, the projection of the waterproof membrane in the direction of the connector covers and extends beyond the connector, and the inner edge of the waterproof membrane extends beyond the inner edge of the connector by a distance greater than or equal to 1 mm, the outer edge of the waterproof membrane extends beyond the outer edge of the connector by a distance greater than or equal to 1 mm, and the arc-shaped hole is a C-shaped hole.

[0009] Optionally, the through hole is an arc-shaped hole, and the first electrode plate is an arc-shaped steel sheet that matches the arc-shaped hole; the first sealing sheet and the second sealing sheet are circular sheets, and the first sealing sheet is provided with a first clearance hole exposing the first electrode plate; the second sealing sheet is provided with a second clearance hole exposing the first electrode plate, and the first electrode plate is electrically connected to the electrode core through the second clearance hole, and the first clearance hole and the second clearance hole are respectively provided at both ends of the first electrode plate.

[0010] Optionally, the diameter of the waterproof membrane is smaller than the diameter of the first sealing sheet; the projection of the waterproof membrane in the direction of the connector covers and extends beyond the connector, and the distance by which the outer edge of the waterproof membrane extends beyond the outer edge of the connector is greater than or equal to 1 mm.

[0011] Optionally, the thickness of the waterproof membrane is 0.06–0.20 mm; the sum of the thicknesses of the first sealing sheet and the second sealing sheet is 0.05–0.20 mm; the thickness of the first electrode plate is 0.10–0.30 mm; and the thickness of the second electrode plate is 0.10–0.30 mm.

[0012] Optionally, the outer periphery of the first electrode plate and the inner periphery of the second electrode plate are respectively provided with connecting portions, which are connected to the first sealing sheet and the second sealing sheet respectively; the connecting portion is a groove or multiple connecting holes.

[0013] Optionally, the first sealing sheet and the second sealing sheet are made of thermoplastic plastic;

[0014] The first sealing sheet and the second sealing sheet are respectively heat-sealed or heat-fused to the first electrode plate and the second electrode plate;

[0015] The connector is formed by the first sealing sheet and / or the second sealing sheet flowing into the gap between the first electrode plate and the second electrode plate during the heat sealing / heat melting process;

[0016] The electrode core is a wound electrode core or a stacked electrode core.

[0017] In this invention, the outer edge of the first electrode plate is housed within a first groove, and the inner edge of the second electrode plate is housed within a second groove. Insulation between the first and second electrode plates is achieved through a connector, improving the reliability and safety of the coin cell. Simultaneously, the first sealing plate, the second sealing plate, and the connector form a first groove for accommodating the outer edge of the first electrode plate and a second groove for accommodating the inner edge of the second electrode plate, making the sealing connection more reliable and preventing leakage from the coin cell. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a button cell battery provided in an embodiment of the present invention;

[0019] Figure 2 This is an exploded view of the top cover assembly of a button battery according to an embodiment of the present invention;

[0020] Figure 3 This is a cross-sectional schematic diagram of a button cell provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a button cell battery provided in another embodiment of the present invention;

[0022] Figure 5 This is an exploded view of the top cover assembly of a button battery according to another embodiment of the present invention;

[0023] Figure 6 This is a cross-sectional schematic diagram of a button cell provided in another embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0026] like Figures 1-6As shown, an embodiment of the present invention provides a button cell battery, including a housing 1, a top cover assembly 2, and an electrode core 3. The housing 1 is a semi-closed structure with one open end. The top cover assembly 2 closes the opening of the housing 1, forming a cavity between the top cover assembly 2 and the housing 1 for accommodating the electrode core 3. The top cover assembly 2 includes a first electrode plate 21, a second electrode plate 22, and an insulating seal 23. The outer periphery of the second electrode plate 22 is connected to the edge of the opening of the housing 1; specifically, the outer periphery of the second electrode plate 22 is welded to the edge of the opening of the housing 1. A through hole is provided on the second electrode plate 22. The first electrode plate 21 is installed in the through hole through the insulating seal 23. The insulating seal 23 includes a first sealing sheet 231, a second sealing sheet 232, and a connector 233. The connector 233 is disposed between the first sealing sheet 231 and the second sealing sheet 232 and connects the first sealing sheet 231 and the second sealing sheet 232. A first groove is formed between the inner side of the connector 233 and the first sealing sheet 231 and the second sealing sheet 232, and the outer edge of the first electrode plate 21 is accommodated in the first groove. A second groove is formed between the outer side of the connector 233 and the first sealing sheet 231 and the second sealing sheet 232, and the inner edge of the second electrode plate 22 is accommodated in the second groove. The electrode core 3 electrically connects the first electrode plate 21 and the second electrode plate 22, and / or the electrode core 3 electrically connects the first electrode plate 21 and the housing 1. The inner side of the connector 233 refers to the side of the connector 233 that is relatively biased towards the central axis of the button cell, and the outer side of the connector 233 refers to the side of the connector 233 that is away from the central axis of the button cell.

[0027] In this embodiment, the outer edge of the first electrode plate 21 is housed in the first groove, and the inner edge of the second electrode plate 22 is housed in the second groove. The first electrode plate 21 and the second electrode plate 22 are insulated from each other by a connector 233, improving the reliability and safety of the coin cell battery. Simultaneously, the first sealing plate 231, the second sealing plate 232, and the connector 233 form the first groove for accommodating the outer edge of the first electrode plate 21 and the second groove for accommodating the inner edge of the second electrode plate 22, making the sealing connection more reliable and preventing leakage of the coin cell battery.

[0028] Furthermore, the first electrode plate 21 is a positive electrode plate, and the second electrode plate 22 is a negative electrode plate. Both the first electrode plate 21 and the second electrode plate 22 are nickel-plated steel sheets. The electrode core 3 includes a positive electrode tab and a negative electrode tab. The positive electrode tab is electrically connected to the first electrode plate 21, and the negative electrode tab is electrically connected to the second electrode plate 22 through the housing 1. The waterproof membrane 24 is an aluminum-plastic film, on which a traceability code is printed for easy tracing of the button cell battery information. The waterproof membrane 24 and the insulating sealant 23 are connected by heat sealing.

[0029] like Figures 1-6As shown, in some embodiments of the present invention, the top cover assembly 2 further includes a waterproof membrane 24 disposed on the side of the first sealing sheet 231 away from the cavity.

[0030] like Figures 1-6 As shown, in some embodiments of the present invention, the side of the first electrode plate 21 facing away from the cavity and the side of the second electrode plate 22 facing away from the cavity are respectively connected to one side surface of the first sealing sheet 231 through a thermal composite seal. The side of the first electrode plate 21 facing the cavity and the side of the second electrode plate 22 facing the cavity are respectively connected to one side surface of the second sealing sheet 232 through a thermal composite seal.

[0031] Specifically, when gas is generated in the electrode core 3, causing the internal pressure of the casing 1 to rise, the first sealing plate 231 and the second sealing plate 232 cause the first electrode plate 21 and the second electrode plate 22 to bulge outward, preventing the button cell battery from exploding. Liquid injection is completed by piercing the connector 233 with a needle, and after injection, the casing is sealed with a waterproof membrane 24, improving the problem of edge weld spatter caused by electrolyte. The structure is simple.

[0032] In this embodiment, the specific formation process of the top cover assembly 2 is as follows: a second sealing sheet 232 is placed, and a first electrode plate 21 and a second electrode plate 22 are placed on the second sealing sheet 232. The first electrode plate 21 is placed in the through hole of the second electrode plate 22, with a gap between it and the second electrode plate 22. The second sealing sheet 232 is placed on the first electrode plate 21 and the second electrode plate 22. The first sealing sheet 231 and the second sealing sheet 232 are heated, and the heated first sealing sheet 231 and the second sealing sheet 232 flow into the gap between the first electrode plate 21 and the second electrode plate 22, forming a connector 233. The first sealing sheet 231 and the second sealing sheet 232 are connected to each other. The two sides of the first electrode plate 21 and the second electrode plate 22 are respectively thermally bonded to the first sealing sheet 231 and the second sealing sheet 232 to form the top cover, while simultaneously achieving an insulating and sealed connection.

[0033] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the through hole is a circular hole 221, and both the first sealing sheet 231 and the second sealing sheet 232 are annular sheets. The waterproof membrane 24 is annular, and the center lines of the waterproof membrane 24 and the first sealing sheet 231 coincide. The inner diameter of the waterproof membrane 24 is larger than the inner diameter of the first sealing sheet 231, and the outer diameter of the waterproof membrane 24 is smaller than the outer diameter of the first sealing sheet 231, to prevent the first electrode plate 21 and the second electrode plate 22 from short-circuiting through the waterproof membrane 24.

[0034] In some embodiments of the present invention, the connector 233 is an annular component, the waterproof membrane 24 covers and extends beyond the connector 233 in the direction of the connector 233, and the inner edge of the waterproof membrane 24 extends beyond the inner edge of the connector 233 by a distance greater than or equal to 1 mm, and the outer edge of the waterproof membrane 24 extends beyond the outer edge of the connector 233 by a distance greater than or equal to 1 mm, so as to prevent water vapor from entering the housing 1.

[0035] like Figure 5 and Figure 6 As shown, in some embodiments of the present invention, the through hole is an arc-shaped hole 222, and the first electrode plate 21 is an arc-shaped steel sheet matching the arc-shaped hole 222. The first sealing plate 231 and the second sealing plate 232 are circular plates. The first sealing plate 231 is provided with a first clearance hole 2311 exposing the first electrode plate 21. The second sealing plate 232 is provided with a second clearance hole 2321 exposing the first electrode plate 21. The first electrode plate 21 is connected to the electrode core 3 through the second clearance hole 2321. The first clearance hole 2311 and the second clearance hole 2321 are respectively provided at both ends of the first electrode plate 21. By setting the first electrode plate 21 to be arc-shaped, the two ends of the first electrode plate 21 are respectively connected to the outside and the electrode core 3 inside the housing 1, forming an arc-shaped current. The current direction of the arc-shaped current is opposite to the current direction generated inside the electrode core 3, so as to cancel the magnetic field generated inside the electrode core 3. Specifically, the arc-shaped hole can be a C-shaped hole.

[0036] like Figure 6 As shown, in some embodiments of the present invention, the diameter of the waterproof membrane 24 is smaller than the diameter of the first sealing sheet 231. The projection of the waterproof membrane 24 in the direction of the connector 233 covers and extends beyond the connector 233, and the distance by which the outer edge of the waterproof membrane 24 extends beyond the outer edge of the connector 233 is greater than or equal to 1 mm, preventing external moisture from entering the housing 1. Further, the waterproof membrane 24 is provided with a clearance hole exposing the first electrode plate 21.

[0037] In some embodiments of the present invention, the thickness of the waterproof membrane 24 is 0.06–0.20 mm. The sum of the thicknesses of the first sealing sheet 231 and the second sealing sheet 232 is 0.05–0.20 mm. The thickness of the first electrode plate 21 is 0.10–0.30 mm. The thickness of the second electrode plate 22 is 0.10–0.30 mm. By limiting the thicknesses of the waterproof membrane 24, the first sealing sheet 231, the second sealing sheet 232, the first electrode plate 21, and the second electrode plate 22, the space utilization rate of the top cover assembly 2 is increased.

[0038] like Figure 2 and Figure 3As shown, in some embodiments of the present invention, the outer periphery of the first electrode plate 21 and the inner periphery of the second electrode plate 22 are respectively provided with connecting portions 25. The connecting portions 25 are respectively connected to the first sealing sheet 231 and the second sealing sheet 232. By providing the connecting portions 25, the connection strength between the first sealing sheet 231 and the second sealing sheet 232 and the first electrode plate 21 and the second electrode plate 22 is increased.

[0039] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the connecting part 25 is a groove or multiple connecting holes. After the first sealing plate 231 and the second sealing plate 232 are heated, they flow into the groove or connecting holes and form a connecting column after cooling, thereby increasing the connection strength.

[0040] In some embodiments of the present invention, the first sealing sheet 231 and the second sealing sheet 232 are made of thermoplastic plastic, and the first sealing sheet 231 and the second sealing sheet 232 are respectively heat-sealed or heat-fused to the first electrode plate 21 and the second electrode plate 22.

[0041] The connector 233 is formed by the first sealing sheet 231 and / or the second sealing sheet 232 flowing into the gap between the first electrode plate 21 and the second electrode plate 22 during the heat sealing / heat melting process;

[0042] The pole core 3 is a wound pole core or a stacked pole core.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A button cell, characterized by, The device includes a housing, a top cover assembly, and an electrode core. The housing is a semi-closed structure with one open end. The top cover assembly closes the opening of the housing to form a cavity for accommodating the electrode core between the top cover assembly and the housing. The top cover assembly includes a first electrode plate, a second electrode plate, and an insulating seal. The outer periphery of the second electrode plate is connected to the edge of the opening of the housing, and a through hole is provided on the second electrode plate. The first electrode plate is installed in the through hole through the insulating seal. The through hole is an arc-shaped hole, and the first electrode plate is an arc-shaped steel sheet that matches the arc-shaped hole. The insulating seal includes a first sealing plate, a second sealing plate, and a connector. The connector is disposed between the first sealing plate and the second sealing plate and connects the first sealing plate and the second sealing plate. The inner side of the connector, the first sealing plate, and the second sealing plate... A first groove is formed between the sealing sheets, and the outer edge of the first electrode plate is accommodated in the first groove; a second groove is formed between the outer side of the connector and between the first and second sealing sheets, and the inner edge of the second electrode plate is accommodated in the second groove; the electrode core is electrically connected to the first electrode plate and the housing respectively; the top cover assembly also includes a waterproof membrane, which is disposed on the side of the first sealing sheet away from the cavity, and the projection of the waterproof membrane in the direction of the connector covers and extends out of the connector; the outer periphery of the first electrode plate and the inner periphery of the second electrode plate are respectively provided with connecting portions, which are respectively connected to the first sealing sheet and the second sealing sheet; the connecting portion is a groove or multiple connecting holes, and the first and second sealing sheets flow into the groove or connecting holes after being heated, and form a connecting column after cooling.

2. The button cell battery according to claim 1, characterized in that, The side of the first electrode plate facing away from the cavity and the side of the second electrode plate facing away from the cavity are respectively sealed to one side surface of the first sealing sheet; the side of the first electrode plate facing the cavity and the side of the second electrode plate facing the cavity are respectively sealed to one side surface of the second sealing sheet.

3. The button cell battery according to claim 2, characterized in that, The first sealing sheet and the second sealing sheet are circular pieces. The first sealing sheet is provided with a first clearance hole that exposes the first electrode plate. The second sealing sheet is provided with a second clearance hole that exposes the first electrode plate. The first electrode plate is electrically connected to the electrode core through the second clearance hole. The first clearance hole and the second clearance hole are respectively provided at both ends of the first electrode plate.

4. The button cell battery according to claim 3, characterized in that, The diameter of the waterproof membrane is smaller than the diameter of the first sealing sheet; the projection of the waterproof membrane in the direction of the connector covers and extends beyond the connector, the outer edge of the waterproof membrane extends beyond the outer edge of the connector by a distance greater than or equal to 1 mm, and the arc-shaped hole is a C-shaped hole.

5. The button cell battery according to claim 1, characterized in that, The thickness of the waterproof membrane is 0.06–0.20 mm; the sum of the thicknesses of the first sealing sheet and the second sealing sheet is 0.05–0.20 mm; the thickness of the first electrode plate is 0.10–0.30 mm; and the thickness of the second electrode plate is 0.10–0.30 mm.

6. The button cell battery according to claim 1, characterized in that, The first sealing sheet and the second sealing sheet are made of thermoplastic plastic; The first sealing sheet and the second sealing sheet are respectively heat-sealed or heat-fused to the first electrode plate and the second electrode plate; The connector is formed by the first sealing sheet and / or the second sealing sheet flowing into the gap between the first electrode plate and the second electrode plate during the heat sealing / heat melting process; The electrode core is a wound electrode core or a stacked electrode core.

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