Button-type supercapacitor

Abstract

This utility model discloses a button-type supercapacitor, comprising: a first electrode shell and a second electrode shell that are fastened to each other, both of which are cylindrical structures with one open side. A sealing ring is provided on the outer side of the cylindrical wall of the second electrode shell, which seals and is engaged between the cylindrical walls of the first and second electrode shells to electrically isolate them; a gasket that is matched and disposed on the inner wall of the cylindrical wall of the second electrode shell; a first electrode plate that is attached to the middle of the first electrode shell through a conductive adhesive layer; a second electrode plate that is attached to the middle of the gasket through a conductive adhesive layer; and a diaphragm disposed between the first and second electrode plates. This utility model overcomes the negative impact of high-temperature processing on the sealing ring and has better overall sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically to a button-type supercapacitor. Background Technology

[0002] With the increasing demand for miniaturization and portability of electronic devices, button capacitors have gained widespread application due to their compact structure, relatively high energy density, fast charging and discharging speed, long cycle life, wide operating temperature range, and environmental friendliness. Based on the double-layer capacitance principle, button capacitors utilize high specific surface area electrode materials and electrolytes to store charge, making them particularly suitable for applications requiring low power and high-frequency charging and discharging, such as smart meters, sensors, and small toys. Compared to traditional electrolytic capacitors, button supercapacitors offer significant advantages in power density, cycle life, and rapid charging and discharging capabilities.

[0003] However, existing button capacitors still face several pressing technical problems in practical production and application. The main defects include leakage caused by unreasonable structural sealing design or improper manual operation during manufacturing, which directly affects the long-term stability and lifespan of the device. Furthermore, the high-temperature baking process required to cure the conductive adhesive connecting the electrodes and the casing during assembly can easily lead to thermal aging of the polymer sealing material, thereby reducing sealing reliability and increasing the risk of leakage. These problems not only reduce product reliability but also increase production costs and the difficulty of quality control.

[0004] To improve product performance and reliability and overcome the shortcomings of existing technologies, it is urgent to optimize the structure of button capacitors so that the new structure can avoid the negative impact of high-temperature processes on the seals and has better overall sealing performance. Utility Model Content

[0005] This invention provides a button-type supercapacitor that can effectively avoid the aging of sealing materials during the processing and has stronger overall sealing performance.

[0006] To achieve these objectives and other advantages of this utility model, a button-type supercapacitor is provided, comprising: a first electrode shell and a second electrode shell that are snapped together, both the first electrode shell and the second electrode shell being a cylindrical structure with one open side; a sealing ring is provided on the outer side of the cylindrical wall of the second electrode shell, the sealing ring sealing and engaging between the cylindrical walls of the first electrode shell and the second electrode shell to electrically isolate the first electrode shell from the second electrode shell; a gasket that is fitted to the bottom wall of the inner cylinder of the second electrode shell; a first electrode plate that is attached to the middle of the first electrode shell through a conductive adhesive layer; a second electrode plate that is attached to the middle of the gasket through a conductive adhesive layer; and a diaphragm disposed between the first electrode plate and the second electrode plate.

[0007] Preferably, the sealing ring completely covers the annular edge of the second electrode shell, the gasket is provided with a folded edge, the folded edge is matched and fitted to the inner ring of the sealing ring, and the bottom surface of the sealing ring is fitted to the inner bottom surface of the first electrode shell.

[0008] Preferably, the edge of the second pole shell is turned outward to form a U-shaped fold, and the sealing ring completely covers the U-shaped fold inside.

[0009] Preferably, the sealing ring is injection molded onto the outside of the U-shaped fold.

[0010] Preferably, the bottom surface of the first electrode shell is recessed to form an annular reinforcing rib, and the first electrode sheet is disposed within the annular reinforcing rib.

[0011] Preferably, the size of the annular reinforcing rib matches the size of the first electrode.

[0012] Preferably, the concave depth of the annular reinforcing rib is half the thickness of the first pole shell.

[0013] Preferably, the diaphragm is circular, and the diameter of the diaphragm is larger than the outer diameter of the gasket.

[0014] Preferably, the diaphragm is made of one of the following materials: nonwoven fabric, cellulose fiber, or composite cellulose.

[0015] Preferably, the first electrode shell, the second electrode shell, and the gasket are all made of 304 stainless steel.

[0016] This utility model has at least the following beneficial effects: First, this utility model uses a second electrode sheet attached to a gasket via a conductive adhesive layer instead of being directly attached to the second electrode shell. In the subsequent process that requires high-temperature baking to cure the conductive adhesive layer, this effectively avoids heat being directly transferred to the sealing ring on the outside of the second electrode shell cylinder wall. This significantly reduces the risk of thermal aging of the sealing ring material during the high-temperature baking process, helps maintain the elasticity and sealing reliability of the sealing ring, and reduces leakage problems caused by sealing failure. Secondly, by adopting a relatively interlocking first and second electrode shell structure, along with internal gasket clamping, electrode mounting, and diaphragm setting, the overall structure of the capacitor is compact, assembly and positioning are simple and accurate, and the disassembly process is relatively clear, which is conducive to improving production efficiency and product maintenance convenience.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the device in one technical solution of this utility model; Figure 2 This is an exploded view of the device in one technical solution of this utility model; Reference numerals in the attached drawings: 1-first electrode shell, 11-ring reinforcing rib, 2-second electrode shell, 21-sealing ring, 22-U-shaped fold, 3-gasket, 31-fold, 4-second electrode plate, 5-first electrode plate, 6-diaphragm, 7-conductive adhesive layer. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0021] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the components described are commercially available unless otherwise specified. In the description of this utility model, it should be noted that, unless otherwise explicitly stated and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] like Figure 1-2As shown, the technical solution of this application provides a button-type supercapacitor, including: a first electrode shell 1 and a second electrode shell 2 that are fastened together, both the first electrode shell 1 and the second electrode shell 2 being open cylindrical structures on one side. A sealing ring 21 is provided on the outer side of the cylindrical wall of the second electrode shell 2, the sealing ring 21 sealing and engaging between the cylindrical walls of the first electrode shell 1 and the second electrode shell 2 to electrically isolate the first electrode shell 1 and the second electrode shell 2; a gasket 3, which is matched and attached to the bottom wall of the inner cylinder of the second electrode shell 2; a first electrode 5, which is attached to the middle of the first electrode shell 1 through a conductive adhesive layer 7; a second electrode 4, which is attached to the middle of the gasket 3 through a conductive adhesive layer 7; and a diaphragm 6, which is disposed between the first electrode 5 and the second electrode 4. Specifically, both the first electrode shell 1 and the second electrode shell 2 are made of stainless steel and stamped into an open cylindrical structure on one side, and the sealing ring 21 is made of stainless steel. A support made of an elastomer material such as fluororubber, resistant to electrolyte corrosion, is disposed on the outer wall of the second electrode shell 2. When the first electrode shell 1 and the second electrode shell 2 are fastened together, the sealing ring 21 is sealed by the combined action of the first electrode shell 1 and the second electrode shell 2. The gasket 3 is a circular structure with a folded edge 31 formed by stamping stainless steel. The gasket 3 can be fitted into the interior of the second electrode shell 2. The gasket 3 and the second electrode shell 2 can be connected by laser welding. The first electrode 5 and the second electrode 4 are both circular electrode sheets. The first electrode 5 and the second electrode 4 are arranged coaxially to reduce contact resistance and improve capacity performance. The conductive adhesive layer 7 is made of a colloid composed of a base resin and conductive filler, which is readily available in the market. It is used to bond the first electrode 5 and the second electrode 4 to the first electrode shell 1 and the second electrode shell 2 respectively, without affecting the conductive circuit inside the capacitor.

[0023] In this technical solution, an uncured conductive adhesive layer 7 is first formed by coating the surfaces of the first electrode shell 1 and the gasket 3. The first electrode 5 and the second electrode 4 are then placed on the corresponding conductive adhesive layer 7. The first electrode shell 1 and the gasket 3 are placed in an oven for baking to allow the conductive adhesive layer 7 to fully cure. The gasket 3 is then welded to the inner wall of the second electrode shell 2 using a laser welding machine. Electrolyte is then added to the first electrode 5 and the second electrode 4, and the diaphragm 6 is laid on the first electrode 5. Finally, the second electrode shell 2, with the gasket 3 connected to it, is aligned and fastened to the first electrode shell 1 to complete the entire production process. In this technical solution, the second electrode 4 is indirectly connected to the second electrode shell 2 through the gasket 3. The high-temperature baking step avoids the risk of heat aging of the sealing ring 21 in the traditional direct bonding solution.

[0024] In another technical solution, the sealing ring 21 completely covers the annular edge of the second electrode shell 2, and the gasket 3 is provided with a folded edge 31. The folded edge 31 is matched and fitted to the inner ring of the sealing ring 21, and the bottom surface of the sealing ring 21 is fitted to the inner bottom surface of the first electrode shell 1. Specifically, the sealing ring 21 completely covers the annular edge of the second electrode shell 2, and the sealing ring 21 and the U-shaped folded edge 22 of the second electrode shell 2 form a three-dimensional mechanical interlock. The bottom surface of the sealing ring 21 is subjected to planar grinding treatment to ensure that it forms a tight seal when it contacts the inner bottom surface of the first electrode shell 1. The gasket 3 is formed by CNC precision stamping to form the folded edge 31. The outer diameter of the folded edge 31 is strictly matched with the inner diameter of the sealing ring 21. The upper edge of the outer wall of the sealing ring 21 is a sloping structure. When sealing, the outer wall of the sealing ring 21 is pressed against the cylinder wall of the first electrode shell 1 to form a gradient seal and block the electrolyte leakage path.

[0025] In another technical solution, the edge of the cylindrical wall of the second pole shell 2 is turned outward to form a U-shaped fold 22. The sealing ring 21 completely covers the U-shaped fold 22 inside. The edge of the cylindrical wall of the second pole shell 2 is turned outward by precision stamping to form a U-shaped fold 22. The U-shaped fold 22 is covered by a mold. Molten elastomer material is injected into the mold under pressure through insert injection molding process, so that the elastomer material completely fills the inner cavity, outer wall and end face of the U-shaped fold 22. After cooling, the sealing ring 21 is formed, realizing the three-dimensional mechanical interlock between the sealing ring 21 and the U-shaped fold 22.

[0026] In another technical solution, the sealing ring 21 is injection molded onto the outside of the U-shaped fold 22.

[0027] In another technical solution, a ring-shaped reinforcing rib 11 is formed concavely on the bottom surface of the first pole shell 1, and the first pole piece 5 is disposed in the ring-shaped reinforcing rib 11. The ring-shaped reinforcing rib 11 is formed concavely on the bottom surface of the first pole shell 1 by a stamping process. The ring-shaped reinforcing rib 11 improves the compressive and bending resistance of the first pole shell 1 and reduces the torsional deformation caused by external force during the assembly and sealing process.

[0028] In another technical solution, the size of the annular reinforcing rib 11 matches the size of the first electrode 5. The annular reinforcing rib 11 can ensure the accurate placement of the positive electrode 5 and reduce the short circuit rate.

[0029] In another technical solution, the concave depth of the annular reinforcing rib 11 is half the thickness of the first pole shell 1, so as to avoid insufficient improvement of the deformation resistance of the first pole shell 1 when the concave depth is too shallow, and at the same time to avoid the increased risk of stamping cracking when the concave depth is too deep.

[0030] In another technical solution, the diaphragm 6 is circular with a diameter larger than the outer diameter of the gasket 3. The diaphragm 6 is disc-shaped with a diameter 1-2 mm larger than the diameter of the gasket 3. When it is attached to the second electrode 4, the edge of the diaphragm 6 is slightly bent and formed into a cup shape due to the restriction of the sealing ring 21. After the first electrode shell 1 and the second electrode shell 2 are assembled, the cup-shaped diaphragm 6 can completely cover the positive electrode 5, improve the overall reliability of the product, and avoid short circuits caused by the misalignment of the first electrode 5 or excessive application of conductive adhesive 7.

[0031] In another technical solution, the diaphragm 6 is made of one of the following materials: non-woven fabric, cellulose fiber, or composite cellulose. In another technical solution, the first electrode shell 1, the second electrode shell 2, and the gasket 3 are all made of 304 stainless steel.

[0032] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0033] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A button-type supercapacitor, characterized in that, include: The first pole shell (1) and the second pole shell (2) are relatively fastened together. Both the first pole shell (1) and the second pole shell (2) are open cylindrical structures. A ring sealing ring (21) is provided on the outer side of the cylindrical wall of the second pole shell (2). The sealing ring (21) seals and is locked between the cylindrical wall of the first pole shell (1) and the cylindrical wall of the second pole shell (2) to electrically isolate the first pole shell (1) and the second pole shell (2). Gasket (3), which is fitted to the bottom wall of the inner cylinder of the second pole shell (2); The first electrode (5) is attached to the middle of the first electrode shell (1) through a conductive adhesive layer (7); The second electrode (4) is attached to the middle of the pad (3) by a conductive adhesive layer (7); A diaphragm (6) is disposed between the first electrode (5) and the second electrode (4).

2. The button-type supercapacitor as described in claim 1, characterized in that, The sealing ring (21) completely covers the annular edge of the second pole shell (2), the gasket (3) is provided with a folded edge (31), the folded edge (31) is matched and fitted to the inner ring of the sealing ring (21), and the bottom surface of the sealing ring (21) is fitted to the inner bottom surface of the first pole shell (1).

3. The button-type supercapacitor as described in claim 2, characterized in that, The edge of the cylinder wall of the second pole shell (2) is turned outward to form a U-shaped fold (22), and the sealing ring (21) completely covers the U-shaped fold (22) inside.

4. The button-type supercapacitor as described in claim 3, characterized in that, The sealing ring (21) is injection molded onto the outside of the U-shaped fold (22).

5. The button-type supercapacitor as described in claim 1, characterized in that, The bottom surface of the first pole shell (1) is recessed to form an annular reinforcing rib (11), and the first pole piece (5) is disposed inside the annular reinforcing rib (11).

6. The button-type supercapacitor as described in claim 5, characterized in that, The dimensions of the annular reinforcing rib (11) match the dimensions of the first electrode plate (5).

7. The button-type supercapacitor as described in claim 6, characterized in that, The concave depth of the ring-shaped reinforcing rib (11) is half the thickness of the first pole shell (1).

8. The button-type supercapacitor as described in claim 1, characterized in that, The diaphragm (6) is circular, and the diameter of the diaphragm (6) is larger than the outer diameter of the gasket (3).

9. The button-type supercapacitor as described in claim 1, characterized in that, The diaphragm (6) is made of one of the following materials: nonwoven fabric, cellulose fiber, or composite cellulose.

10. The button-type supercapacitor as described in claim 1, characterized in that, The first electrode shell (1), the second electrode shell (2), and the gasket (3) are all made of 304 stainless steel.

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