CN211016802U - Anode foil for aluminum electrolytic capacitor with edge portion left white and capacitor - Google Patents
Anode foil for aluminum electrolytic capacitor with edge portion left white and capacitor Download PDFInfo
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- CN211016802U CN211016802U CN201920965382.XU CN201920965382U CN211016802U CN 211016802 U CN211016802 U CN 211016802U CN 201920965382 U CN201920965382 U CN 201920965382U CN 211016802 U CN211016802 U CN 211016802U
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Abstract
An anode foil for an aluminum electrolytic capacitor with edge white left comprises an aluminum foil body and an electrical lead-out sheet, wherein a layer of aluminum powder layer is formed on the surface of the aluminum foil body in a sintering mode, and the electrical lead-out sheet is left white. The utility model discloses an aluminium electrolytic capacitor that limit portion left white is provided with the electrical property on the positive pole paper tinsel and draws forth the piece, and the electrical property draws forth and can not sinter the aluminium bisque on the piece, draws forth the usefulness as the electrical property. Because the toughness and the ductility of aluminium foil itself are good, can directly weld on the electric property draws forth the piece and draw forth the positive pole of condenser, if need extra extension positive pole lead wire simultaneously, then can carry out the riveting of positive pole lead wire in electric property draws forth piece department, can not damage the part of aluminium powder layer, simultaneously because the toughness and the ductility of aluminium foil itself are good, welding or riveted effect also can be better.
Description
Technical Field
The invention relates to an anode foil of an aluminum electrolytic capacitor, in particular to an anode foil for an aluminum electrolytic capacitor with white edges and a preparation method thereof.
Background
In the raw materials of the current aluminum electrolytic capacitor, the quality of the anode foil is the most important; the best quality anode foil is still the enterprise in japan at present. For example, the aluminum foil of the japan eastern ocean brand is formed by coating a layer of aluminum powder slurry on an aluminum foil substrate, and then forming and sintering the aluminum foil substrate to form an aluminum powder layer with high porosity and large specific surface area on the aluminum foil substrate, thereby forming an aluminum powder sintered foil. The aluminum powder sintered foil has certain withstand voltage value and capacitance after being subjected to a conventional aluminum capacitor anode foil forming process, becomes the aluminum powder sintered anode foil, can be theoretically used as an aluminum electrolytic capacitor anode foil, and is used for manufacturing the aluminum electrolytic capacitor.
However, it was found that the following problems were present in the production process of the Toyo aluminum foil used for the production of the capacitor:
the microstructure of the aluminum powder layer on the surface of the aluminum foil is composed of a plurality of partially connected tiny aluminum powder particles, so that the aluminum foil has much lower toughness and ductility than the aluminum foil, and is brittle and easy to crack. Therefore, when the lead is riveted, the aluminum foil at the riveted portion is often cracked and broken. Such poor conditions can damage the electrical properties of the anode foil, resulting in negative effects such as short circuits in the capacitor, poor contacts, excessive internal resistance, etc.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an anode foil for an aluminum electrolytic capacitor with white edges and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the anode foil for the aluminum electrolytic capacitor with edge white left comprises an aluminum foil body and an electrical lead-out sheet, wherein a layer of aluminum powder layer is formed on the surface of the aluminum foil body in a sintering mode, and the electrical lead-out sheet is white left.
In the invention, because the aluminum foil has good toughness and ductility, the anode of the capacitor can be led out by directly welding the electrical lead-out piece, and meanwhile, if the anode lead needs to be additionally lengthened, the anode lead can be riveted at the electrical lead-out piece without damaging the part of the aluminum powder layer.
Preferably, the anode foil for the aluminum electrolytic capacitor with the edge portion left white is characterized in that the porosity of the aluminum powder layer is 10% -50%, and the total thickness of the aluminum powder layer is 50-500 μm.
A method for manufacturing an anode foil for an aluminum electrolytic capacitor with white edges comprises the following steps:
1) 1) mixing aluminum powder and solvent according to the weight ratio: uniformly mixing a solvent =1: 0.5-1: 2 to form a mixed slurry for later use, wherein the solvent comprises one or more of alcohol, ethylene glycol, glycerol, NMP, resin, PVDF, xylene and methanol; the solvent can play a certain role in bonding, so that the aluminum powder can be uniform in thickness when being coated on the aluminum foil substrate.
2) Cleaning an aluminum foil substrate, and intermittently coating the mixed slurry prepared in the step 1) on the aluminum foil substrate by using a coating machine, so that the mixed slurry is intermittently coated on the aluminum foil substrate, and two ends or four sides of each section of the mixed slurry are blank aluminum foil substrates;
3) drying the aluminum foil substrate in the step 2), and then sintering at the sintering temperature of 500-700 ℃ for 1-120 min; the sintering atmosphere can be inert gas or vacuum condition;
4) step 3), after sintering is completed, die cutting is carried out on the blank part of the aluminum foil substrate, and the blank part is cut into the shape of the needed anode lead to form a primary anode foil;
5) and 4) carrying out chemical synthesis on the primary anode foil die-cut in the step 4) to finally form the anode foil.
In the above method for manufacturing anode foil for aluminum electrolytic capacitor with edge white left, preferably, the formation condition of step 5) is a conventional formation method for aluminum electrolytic capacitor anode foil, for example, the formulation of the formation solution comprises 100 g/L boric acid +1 g/L ammonium pentaborate, the formation temperature is 60-95 ℃, the formation voltage is 250-550V, and the initial current is 1-10 mA/cm
In the above method for manufacturing an anode foil for an aluminum electrolytic capacitor with a margin, preferably, the inert gas includes nitrogen, argon or helium.
An aluminum electrolytic capacitor comprises a core bag and a shell, wherein the core bag is hermetically arranged in the shell and is formed by laminating an anode foil, a cathode foil and electrolytic paper, and the anode foil adopts the anode foil; or the anode foil prepared by the method for manufacturing the anode foil for the aluminum electrolytic capacitor with the white edge.
The preparation method of the aluminum electrolytic capacitor comprises the following steps: 1) cutting the anode foil, the cathode foil and the electrolytic paper into designed sizes;
2) sandwiching an anode foil with edge part left white between two pieces of electrolytic paper, and dripping electrolyte on the electrolytic paper
3) Pasting a piece of cathode foil on the surface of the electrolytic paper, wherein the cathode foil completely covers the aluminum powder sintered part on the anode foil, pasting a layer of electrolytic paper on the cathode foil, and fastening the core package by using an adhesive tape;
4) and 3) turning over the semi-finished core package prepared in the step 3), and repeating the step 2) and the step 3) to form a complete core package, wherein the core package is a layer-by-layer stacked structure of electrolytic paper, cathode foil, electrolytic paper, aluminum powder sintered foil (anode foil), electrolytic paper, cathode foil and electrolytic paper in sequence.
5) And encapsulating the prepared core package to form a complete capacitor.
In the above method for manufacturing an aluminum electrolytic capacitor, preferably, the electrolytic paper is packaged by the oiled paper and the aluminum plastic film in step 7).
Compared with the prior art, the invention has the advantages that: the anode foil for the aluminum electrolytic capacitor with the edge part left white is provided with the electrical lead-out sheet, and an aluminum powder layer cannot be sintered on the electrical lead-out sheet for electrical lead-out. Because the toughness and the ductility of aluminium foil itself are good, can directly weld on the electric property draws forth the piece and draw forth the positive pole of condenser, if need extra extension positive pole lead wire simultaneously, then can carry out the riveting of positive pole lead wire in electric property draws forth piece department, can not damage the part of aluminium powder layer, simultaneously because the toughness and the ductility of aluminium foil itself are good, welding or riveted effect also can be better.
Drawings
Fig. 1 is a schematic structural view of the mixed slurry of example 1 after being coated on an aluminum foil substrate in a batch manner.
FIG. 2 is a schematic structural diagram of the blank part in step 4) of example 1 after die cutting.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described 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
The anode foil for the aluminum electrolytic capacitor with the edge left white as shown in fig. 1 and fig. 2 comprises an aluminum foil body and an electrical lead-out sheet, wherein a layer of aluminum powder layer is formed on the surface of the aluminum foil body in a sintering mode, and the electrical lead-out sheet is left white.
In this embodiment, the porosity of the aluminum powder layer is 40%, and the total thickness of the aluminum powder layer is 100 μm.
The method for manufacturing the anode foil for the aluminum electrolytic capacitor with the white edge comprises the following steps:
1) uniformly mixing aluminum powder and a solvent according to the proportion of 1:0.8 to form a mixed slurry for later use, wherein the solvent can be one or more of alcohol, glycol, glycerol, NMP, resin, PVDF, xylene and methanol;
2) cleaning an aluminum foil substrate, and intermittently coating the mixed slurry prepared in the step 1) on the aluminum foil substrate by using a coating machine, so that the mixed slurry is intermittently coated on the aluminum foil substrate, and both ends of each section of the mixed slurry are blank aluminum foil substrates; the coated aluminum foil substrate is shown in fig. 1.
3) Drying the aluminum foil substrate in the step 2), and then sintering at the sintering temperature of 500-700 ℃ for 1-120 min; the sintering atmosphere is an inert gas atmosphere formed by nitrogen gas flow.
4) Step 3), after sintering is completed, die cutting is carried out on the blank part of the aluminum foil substrate, and the shape of an anode lead is cut out of the blank part to form a primary anode foil; the schematic view of the die-cut structure is shown in fig. 2.
5) The formulation of the formation liquid comprises 100 g/L of boric acid +1 g/L of ammonium pentaborate, the formation temperature is 60-95 ℃, the formation voltage is 250-550V, and the initial current is 1-10 mA/cm.
In the aluminum electrolytic capacitor with the edge portion left blank according to the present embodiment, the electrical lead-out sheet is provided on the anode foil, and the electrical lead-out sheet is used for electrical lead-out without sintering an aluminum powder layer. Because the toughness and the ductility of aluminium foil itself are good, can directly weld on the electric property draws forth the piece and draw forth the positive pole of condenser, if need extra extension positive pole lead wire simultaneously, then can carry out the riveting of positive pole lead wire in electric property draws forth piece department, can not damage the part of aluminium powder layer, simultaneously because the toughness and the ductility of aluminium foil itself are good, welding or riveted effect also can be better.
This example also provides an aluminum electrolytic capacitor using the anode foil prepared in this example, which is formed by laminating an anode foil, a cathode foil and an electrolyte, wherein the effective size of the sintered part of aluminum powder on the anode foil is 3x3cm, the effective size of the cathode foil is 3.5x4cm, and the size of the electrolytic paper is 4x5 cm. The electrolyte in this example is a thermosetting gel electrolyte, and the electrolyte has a certain viscosity after being cured.
The aluminum electrolytic capacitor of the embodiment comprises the following steps:
1) the anode foil, cathode foil and electrolytic paper were first cut to size such that the effective size of the sintered portion of aluminum powder on the anode foil was 3x3cm, the effective size of the cathode foil was 3.5x4cm and the size of the electrolytic paper was 4x5 cm.
2) The anode foil with white edges prepared in the embodiment is sandwiched between two pieces of electrolytic paper, and sufficient thermosetting gel electrolyte or light-curing gel electrolyte is dripped on the electrolytic paper, so that the electrolyte is gelled under the condition of heating or light irradiation, and the electrolyte has certain viscosity.
3) A piece of cathode foil is attached to the surface of the electrolytic paper, and the cathode foil completely covers the sintered part of the aluminum powder on the anode foil. Because the size of the electrolytic paper is slightly larger than that of the cathode foil, after the cathode foil is attached, the periphery of the electrolytic paper still has a partially exposed electrolyte area, and the electrolytic paper adsorbs the solidified gel electrolyte with viscosity. And adhering a layer of electrolytic paper on the cathode foil, and adhering the electrolytic paper tightly by using the viscosity of the gel electrolyte at the periphery. When the gel electrolyte is not used, the core pack may be fastened using an adhesive tape.
4) And 3) turning over the semi-finished core package prepared in the step 3), and repeating the step 2) and the step 3) to form a complete core package, wherein the core package is a layer-by-layer stacked structure of electrolytic paper, cathode foil, electrolytic paper, aluminum powder sintered foil (anode foil), electrolytic paper, cathode foil and electrolytic paper in sequence.
5) And (3) encapsulating the core package prepared in the step 4) by using silicone oil paper and an aluminum plastic film to form a complete capacitor.
Claims (3)
1. An aluminum electrolytic capacitor anode foil with edge white, characterized in that: the battery cell lead-out piece is characterized by comprising an aluminum foil body and an electrical lead-out piece, wherein a layer of aluminum powder layer is formed on the surface of the aluminum foil body in a sintering mode, and the battery cell lead-out piece is left white.
2. The anode foil for an aluminum electrolytic capacitor with edge portion left white according to claim 1, characterized in that: the porosity of the aluminum powder layer is 10% -50%, and the total thickness of the aluminum powder layer is 50-500 μm.
3. An aluminum electrolytic capacitor, characterized in that: the core bag is sealed in the shell, the core bag is formed by laminating an anode foil, a cathode foil and electrolytic paper, and the anode foil adopts the anode foil in the claim 1 or 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920965382.XU CN211016802U (en) | 2019-06-25 | 2019-06-25 | Anode foil for aluminum electrolytic capacitor with edge portion left white and capacitor |
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| CN201920965382.XU CN211016802U (en) | 2019-06-25 | 2019-06-25 | Anode foil for aluminum electrolytic capacitor with edge portion left white and capacitor |
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| CN211016802U true CN211016802U (en) | 2020-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289170A (en) * | 2019-06-25 | 2019-09-27 | 湖南艾华集团股份有限公司 | Anode foil for aluminum electrolytic capacitor, preparation method and the capacitor that edge is left white |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289170A (en) * | 2019-06-25 | 2019-09-27 | 湖南艾华集团股份有限公司 | Anode foil for aluminum electrolytic capacitor, preparation method and the capacitor that edge is left white |
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