CN115376830A - Laminated solid aluminum electrolytic capacitor with good sealing performance - Google Patents
Laminated solid aluminum electrolytic capacitor with good sealing performance Download PDFInfo
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- CN115376830A CN115376830A CN202210841506.XA CN202210841506A CN115376830A CN 115376830 A CN115376830 A CN 115376830A CN 202210841506 A CN202210841506 A CN 202210841506A CN 115376830 A CN115376830 A CN 115376830A
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- cathode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/008—Terminals
- H01G9/012—Terminals specially adapted for solid capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
Abstract
A laminated solid aluminum electrolytic capacitor with good sealing performance comprises an insulating shell, a core, sealant, an anode lead-out piece and a cathode lead-out piece, wherein the core is arranged in the insulating shell in a sealing manner through the sealant; one end of the anode lead-out piece is electrically connected with the anode end of the core, the other end of the anode lead-out piece extends out of the insulating shell or the sealant is exposed, one end of the cathode lead-out piece is electrically connected with the cathode end of the core, and the other end of the cathode lead-out piece extends out of the insulating shell or the sealant is exposed. In the invention, the plastic shell is sealed by sealing glue instead of plastic packaging material, so that water vapor can be better prevented from entering the product, one side of the bonding pad section of the anode lead-out piece and the cathode lead-out piece is tightly attached to the insulating shell, and the other side of the bonding pad section is exposed, so that the bonding pad section and the sealant can be covered by solder paste during surface mounting, thereby reducing the water vapor entering the core from the joint of the electrode terminal and the plastic packaging material, and improving the high-humidity tolerance capability of the aluminum electrolytic capacitor.
Description
Technical Field
The invention relates to a solid-state aluminum electrolytic capacitor, in particular to a laminated solid-state aluminum electrolytic capacitor with good sealing performance.
Background
Compared with the liquid aluminum electrolytic capacitor, the manufactured capacitor has the advantages of smaller volume, smaller Equivalent Series Resistance (ESR), wide temperature range, environmental protection and the like, meets the development trend of miniaturization and high frequency of electronic products, and meets the requirements of Surface Mount Technology (SMT).
As shown in the patent (202122073854.0), the laminated solid-state aluminum electrolytic capacitor uses a monolithic capacitor core as a basic unit, a monolithic positive electrode end includes a porous aluminum foil and an aluminum oxide dielectric layer formed on the surface of the porous aluminum foil, a monolithic negative electrode end includes a porous aluminum foil and an aluminum oxide dielectric layer formed on the surface of the porous aluminum foil, a solid-state electrolyte first cathode formed on the surface of the dielectric layer, a carbon layer and a silver layer (i.e., a second cathode and a third cathode) formed on the solid-state electrolyte. And welding the positive ends of the single sheets and the positive lead-out terminal together, laminating and bonding the negative ends of the single sheets and the negative lead-out terminal together through metal slurry, laminating a plurality of single sheets on the single sheet laminated body to form a multilayer laminated body, packaging the laminated body by using plastic packaging materials, and bending the laminated body twice to be attached to the lower surface of the laminated solid-state capacitor, thereby forming the laminated solid-state aluminum electrolytic capacitor.
Because the plastic package material is not completely waterproof and has water absorption, and after reflow soldering is carried out during mounting, gaps can appear at joints due to different expansion coefficients between the plastic package material and the leading-out terminals after expansion with heat and contraction with cold. Under the condition of high temperature and high humidity, water vapor or air in the existing laminated solid aluminum electrolytic capacitor can penetrate through a joint gap and a plastic package material body and enter the core, so that the characteristic of the product is deteriorated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a laminated solid aluminum electrolytic capacitor with good sealing property.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a laminated solid aluminum electrolytic capacitor with good sealing performance comprises an insulating shell, a core, sealant, an anode lead-out piece and a cathode lead-out piece, wherein the core is arranged in the insulating shell in a sealing mode through the sealant; one end of the anode lead-out piece is electrically connected with the anode end of the core, the other end of the anode lead-out piece extends out of the insulating shell or the sealant is exposed, one end of the cathode lead-out piece is electrically connected with the cathode end of the core, and the other end of the cathode lead-out piece extends out of the insulating shell or the sealant is exposed.
Preferably, the sealant is filled in the insulating shell, and the core is filled in the insulating shell by the sealant.
In the laminated solid aluminum electrolytic capacitor with good sealing performance, preferably, the anode lead-out piece and the cathode lead-out piece are both in a zigzag shape; the anode lead-out piece and the cathode lead-out piece respectively comprise a connecting section, a lead-out section and a bonding pad section, the connecting section of the anode lead-out piece and the connecting section of the cathode lead-out piece are respectively and electrically connected with the anode end and the cathode end of the core, and the bonding pad sections of the anode lead-out piece and the cathode lead-out piece are exposed outside the insulating shell and the sealant.
Preferably, one side of the leading-out sections of the anode leading-out piece and the cathode leading-out piece is embedded on the inner wall of the insulating shell, and the other side of the leading-out sections is connected with the sealant in a sealing mode.
Preferably, in the laminated solid-state aluminum electrolytic capacitor with good sealing performance, the connecting section of the cathode lead-out piece is connected to the cathode end of the core through conductive paste, and the connecting section of the anode lead-out piece is connected to the anode end of the core through conductive paste or welded.
In the laminated solid-state aluminum electrolytic capacitor with good sealing performance, preferably, the core comprises one or more single sheets, and the single sheets are laminated to form the core; the single sheet comprises an anode, a cathode and isolating glue, wherein the isolating glue is arranged between the anode and the cathode; the anode comprises a valve metal foil and an oxidation film formed on the valve metal foil, the cathode comprises the valve metal foil, the oxidation film formed on the valve metal foil, a high-molecular conductive polymer layer and a cathode extraction layer, the high-molecular conductive polymer layer is formed on the surface of the oxidation film, and the cathode extraction layer is formed on the surface of the high-molecular conductive polymer layer.
In the laminated solid aluminum electrolytic capacitor with good sealing performance, preferably, the cathode lead-out layer includes a carbon layer and a conductive adhesive layer, the carbon layer is formed on the surface of the polymer conductive polymer layer, and the conductive adhesive layer is formed on the surface of the carbon layer.
In the laminated solid aluminum electrolytic capacitor with good sealing performance, preferably, after a plurality of single sheets are laminated together, the conductive adhesive layers of the cathode ends of two adjacent single sheets are connected together, and the anode ends of two adjacent single sheets are connected together through welding and melting.
In the laminated solid aluminum electrolytic capacitor with good sealing performance, preferably, the cathode lead-out layer includes a carbon layer and a silver paste layer, the carbon layer is formed on the surface of the polymer conductive polymer layer, and the silver paste layer is formed on the surface of the carbon layer.
In the laminated solid aluminum electrolytic capacitor with good sealing performance, preferably, after a plurality of single sheets are laminated together, the silver paste layers at the cathode ends of two adjacent single sheets are electrically connected together, and the anode ends of two adjacent single sheets are connected together through welding and melting.
Compared with the prior art, the invention has the advantages that: in the invention, the plastic shell is sealed by sealing glue instead of plastic packaging material, so that water vapor can be better prevented from entering the product, one side of the bonding pad section of the anode lead-out piece and the cathode lead-out piece is tightly attached to the insulating shell, and the other side of the bonding pad section is exposed, so that the bonding pad section and the sealant can be covered by solder paste during surface mounting, and the water vapor can be reduced from entering the core from the joint of the electrode terminal and the plastic packaging material. Meanwhile, in the invention, the anode lead-out sheet and the cathode lead-out sheet are Z-shaped; the connecting section of the anode lead-out piece and the cathode lead-out piece is deep into the top of the insulating surgery and is electrically connected with the cathode end and the anode end of the core, so that the distance of water vapor entering the core through the joint of the anode lead-out piece and the cathode lead-out piece with filling glue is prolonged, and the difficulty of the water vapor entering the core is increased.
Drawings
Fig. 1 is a schematic sectional view of a laminated solid-state aluminum electrolytic capacitor having good sealing performance in example 1.
Fig. 2 is a schematic bottom view of the laminated solid-state aluminum electrolytic capacitor with good sealing performance in example 1 before glue pouring.
Fig. 3 is a schematic top view of the laminated solid-state aluminum electrolytic capacitor of example 1.
Description of the figures
1. An insulating housing; 2. a core; 21. isolating glue; 22. a valve metal foil; 23. an oxide film; 24. a polymer conductive polymer layer; 25. a carbon layer; 26. a silver paste layer; 27. welding the melt; 3. sealing glue; 4. a cathode lead-out sheet; 5. a cathode lead-out sheet; 6. a connecting section; 7. a lead-out section; 8. a pad segment; 9. conducting paste; 10. and (7) welding the hole.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the laminated solid aluminum electrolytic capacitor with good sealing performance comprises an insulating shell 1, a core 2, a sealant 3, an anode lead-out sheet 4 and a cathode lead-out sheet 5, wherein the core 2 is arranged in the insulating shell 1 in a sealing manner through the sealant 3; one end of the anode lead-out piece 4 is electrically connected with the anode end of the core 2, the other end of the anode lead-out piece extends out of the insulating shell 1 or the sealant 3 is exposed, one end of the cathode lead-out piece 5 is electrically connected with the cathode end of the core 2, and the other end of the cathode lead-out piece extends out of the insulating shell 1 or the sealant 3 is exposed. In this embodiment, the sealant 3 is filled in the insulation housing 1, and the sealant 3 fills the core 2 in the insulation housing 1. In this embodiment, the sealant 3 may be an epoxy resin adhesive.
In the present embodiment, the structures of the anode lead-out sheet 4 and the cathode lead-out sheet 5 are similar. The anode lead-out sheet 4 and the cathode lead-out sheet 5 are Z-shaped; the anode lead-out piece 4 and the cathode lead-out piece 5 both comprise a connecting section 6, a lead-out section 7 and a bonding pad section 8, the connecting section 6 of the anode lead-out piece 4 and the connecting section 6 of the cathode lead-out piece 5 are respectively electrically connected with the anode end and the cathode end of the core 2, and the bonding pad sections 8 of the anode lead-out piece 4 and the cathode lead-out piece 5 are both exposed outside the insulating shell 1 and the sealant 3.
In this embodiment, as shown in fig. 1, the connection section 6, the lead-out section 7 and the bonding pad section 8 of the anode lead sheet 4 and the cathode lead sheet 5 are integrally formed, that is, the connection section 6, the lead-out section 7 and the bonding pad section 8 of the anode lead sheet 4 and the cathode lead sheet 5 are each a sheet bent in a zigzag shape. One side of a connecting section 6 of an anode lead-out piece 4 is embedded on the inner wall of the bottom surface of the insulating shell, the other side of the connecting section is connected with an anode end through conductive paste 9, one side of a lead-out section 7 of the anode lead-out piece 4 is embedded on the vertical side wall of the insulating shell 1, the other side of the lead-out section is connected with the sealant 3 in a sealing mode, and a bonding pad section 8 of the anode lead-out piece 4 is exposed outside the sealant 3. As shown in fig. 1 and 3, one side of the pad segment 8 of the anode tab 4 is closely attached to the insulating case, and the other side is exposed. The structure of the cathode lead 5 is similar to that of the anode lead 4. One side of a connecting section 6 of the cathode lead-out piece 5 is embedded on the inner wall of the bottom surface of the insulating shell, the other side of the connecting section is connected with the cathode end through conductive paste 9, one side of a lead-out section 7 of the cathode lead-out piece 5 is embedded on the vertical side wall of the insulating shell 1, the other side of the lead-out section is hermetically connected with the sealant 3, and a bonding pad section 8 of the cathode lead-out piece 5 is exposed outside the sealant 3.
In this embodiment, the connection section 6 of the anode tab 4 and the cathode tab 5 can be fixed to the inner wall of the bottom surface of the insulating housing by glue, and the connection section 7 of the anode tab 4 and the cathode tab 5 can also be fixed to the vertical side wall of the insulating housing by glue.
In the present embodiment, the core 2 comprises one or more individual sheets, which are arranged in a stack to form the core 2; the single piece comprises an anode, a cathode and isolating glue 21, wherein the isolating glue 21 is arranged between the anode and the cathode; the anode includes a valve metal foil 22 and an oxide film 23 formed on the valve metal foil 22, the cathode includes the valve metal foil 22, the oxide film 23 formed on the valve metal foil 22, a polymer conductive polymer layer 24 and a cathode extraction layer, the polymer conductive polymer layer 24 is formed on the surface of the oxide film 23, and the cathode extraction layer is on the surface of the polymer conductive polymer layer 24. In this embodiment, the valve metal foil 22 is a porous aluminum foil, and the oxide film 23 is an aluminum oxide film.
In the present embodiment, as shown in fig. 1, the core 2 comprises 5 single pieces, and the 5 single pieces are stacked to form the core 2; the single piece comprises an anode, a cathode and isolating glue 21, wherein the isolating glue 21 is arranged between the anode and the cathode and plays a role in isolating the anode and the cathode; the anode includes a valve metal foil 22 and an oxide film 23 formed on the valve metal foil 22, and the anode is provided with a welding hole 10. The cathode comprises a valve metal foil 22, an oxidation film 23 formed on the valve metal foil 22, a polymer conductive polymer layer 24 and a cathode extraction layer, wherein the polymer conductive polymer layer 24 is formed on the surface of the oxidation film 23, and the cathode extraction layer is formed on the surface of the polymer conductive polymer layer 24. In this embodiment, the valve metal foils 22 of the anode and the cathode are the same, and the oxide film 23 is formed on the valve metal foil 22. The cathode extraction layer comprises a carbon layer 25 and a silver paste layer 26, wherein the carbon layer 25 is formed on the surface of the polymer conductive polymer layer 24, and the silver paste layer 26 is formed on the surface of the carbon layer 25.
In this embodiment, after 5 sheets are laminated together, the silver paste layers 26 of the cathode ends of two adjacent sheets are joined together, the anode ends of two adjacent sheets are joined together by the welding melt 27, and the anodes are welded to the welding melt 27 through the welding holes 10. In this embodiment, the silver paste layer 26 may be replaced with a conductive paste layer.
When the laminated solid aluminum electrolytic capacitor with good sealing performance of the embodiment is manufactured, the anode lead-out sheet 4 and the cathode lead-out sheet 5 are fixedly connected to the preset position of the inner wall of the insulating shell 1, and then the anode end and the cathode end of the core 2 are electrically connected to the connecting section 6 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 through the conductive paste 9. And finally, filling and glue sealing are carried out through epoxy resin glue.
In this embodiment, seal through the plastics shell and glue 3 and replace the plastic envelope material and encapsulate, can prevent better that steam from getting into inside the product, insulating casing, opposite side are hugged closely to one side of the pad section 8 that piece 4 and the negative pole were drawn forth to the positive pole, and the solder paste can cover the joint of pad section 8 and sealed glue 3 when surface mounting, and reducible steam gets into inside core 2 from the junction of electrode terminal and plastic envelope material like this. Meanwhile, in the invention, the anode lead-out sheet 4 and the cathode lead-out sheet 5 are Z-shaped; the connecting section 6 of the anode lead-out piece 4 and the cathode lead-out piece 5 extends into the top of the insulating surgery and is electrically connected with the cathode end and the anode end of the core 2, so that the distance of water vapor entering the core 2 through the joint of the anode lead-out piece 4, the cathode lead-out piece 5 and filling glue is prolonged, and the difficulty of the water vapor entering the core 2 is increased.
Claims (10)
1. A laminated solid aluminum electrolytic capacitor with good sealing performance is characterized in that: the lead-out chip comprises an insulating shell, a core, sealant, an anode lead-out chip and a cathode lead-out chip, wherein the core is arranged in the insulating shell in a sealing manner through the sealant; one end of the anode lead-out piece is electrically connected with the anode end of the core, the other end of the anode lead-out piece extends out of the insulating shell or the sealant is exposed, one end of the cathode lead-out piece is electrically connected with the cathode end of the core, and the other end of the cathode lead-out piece extends out of the insulating shell or the sealant is exposed.
2. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 1, wherein: the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell through the sealing glue.
3. The laminated solid aluminum electrolytic capacitor with good sealing performance as claimed in claim 1, wherein: the anode lead-out sheet and the cathode lead-out sheet are Z-shaped; the anode leading-out piece and the cathode leading-out piece respectively comprise a connecting section, a leading-out section and a bonding pad section, the connecting section of the anode leading-out piece and the connecting section of the cathode leading-out piece are respectively electrically connected with the anode end and the cathode end of the core, and the bonding pad sections of the anode leading-out piece and the cathode leading-out piece are exposed outside the insulating shell and the sealant.
4. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 3, wherein: one side of the leading-out section of the anode leading-out piece and the leading-out section of the cathode leading-out piece are embedded on the inner wall of the insulating shell, and the other side of the leading-out section is connected with the sealant in a sealing mode.
5. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 3, wherein: the connecting section of the cathode lead-out sheet is connected to the cathode end of the core through conductive paste, and the connecting section of the anode lead-out sheet is connected to the anode end of the core through conductive paste or welded.
6. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in any one of claims 1 to 5, wherein: the core comprises one or more single sheets, and the single sheets are stacked to form the core; the single sheet comprises an anode, a cathode and isolating glue, wherein the isolating glue is arranged between the anode and the cathode; the anode comprises a valve metal foil and an oxide film formed on the valve metal foil, the cathode comprises the valve metal foil, the oxide film formed on the valve metal foil, a high-molecular conductive polymer layer and a cathode extraction layer, the high-molecular conductive polymer layer is formed on the surface of the oxide film, and the cathode extraction layer is formed on the surface of the high-molecular conductive polymer layer.
7. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 6, wherein: the cathode extraction layer comprises a carbon layer and a conductive adhesive layer, the carbon layer is formed on the surface of the high-molecular conductive polymer layer, and the conductive adhesive layer is formed on the surface of the carbon layer.
8. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 7, wherein: after the plurality of single sheets are laminated together, the conductive adhesive layers at the cathode ends of the two adjacent single sheets are connected together, and the anode ends of the two adjacent single sheets are connected together through welding and melting.
9. The laminated solid aluminum electrolytic capacitor with good sealing performance as claimed in claim 6, wherein: the cathode extraction layer comprises a carbon layer and a silver paste layer, the carbon layer is formed on the surface of the high-molecular conductive polymer layer, and the silver paste layer is formed on the surface of the carbon layer.
10. The laminated solid-state aluminum electrolytic capacitor with good sealing performance as claimed in claim 9, wherein: after the multiple single sheets are laminated together, the silver paste layers at the cathode ends of the two adjacent single sheets are electrically connected together, and the anode ends of the two adjacent single sheets are connected together through welding and melting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841506.XA CN115376830A (en) | 2022-07-18 | 2022-07-18 | Laminated solid aluminum electrolytic capacitor with good sealing performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841506.XA CN115376830A (en) | 2022-07-18 | 2022-07-18 | Laminated solid aluminum electrolytic capacitor with good sealing performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115376830A true CN115376830A (en) | 2022-11-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210841506.XA Pending CN115376830A (en) | 2022-07-18 | 2022-07-18 | Laminated solid aluminum electrolytic capacitor with good sealing performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115376830A (en) |
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2022
- 2022-07-18 CN CN202210841506.XA patent/CN115376830A/en active Pending
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