阅读说明：本技术 一种耐边缘短路的液态铝电解电容器及其制备方法 (Liquid aluminum electrolytic capacitor resistant to edge short circuit and preparation method thereof ) 是由 蔡锦丰 彭小昕 蓝云鹏 夏凯翔 夏静 夏浩午 于 2021-07-28 设计创作，主要内容包括：一种耐边缘短路的液态铝电解电容器,包括外壳和芯包,芯包通过胶塞密封设置在外壳内；芯包包括阳极箔、阴极箔和电解纸；芯包的底部或/和顶部吸附有三羟乙基异氰尿酸酯粉末。本发明中将三羟乙基异氰尿酸酯粉末吸附在芯包的底部或/和顶部后发生部分溶解,可以很好的吸收芯包的底部或/和顶部上多余的电解液,提高芯包边缘的闪火电压；与此同时,剩余的三羟乙基异氰尿酸酯,可通过自身的热溶解,吸收芯包防爆过程中散发的热量,延缓电解液的气化,使得防爆阀不会瞬间承受大的气压,防爆阀在打开时有一个过程,防爆阀缓慢打开,这可以很好的实现电容器的点防爆。(A liquid aluminum electrolytic capacitor resistant to edge short circuit comprises a shell and a core bag, wherein the core bag is arranged in the shell in a sealing mode through a rubber plug; the core bag comprises anode foil, cathode foil and electrolytic paper; the bottom or/and the top of the core bag is adsorbed with the trihydroxyethyl isocyanurate powder. According to the invention, the trihydroxyethyl isocyanurate powder is partially dissolved after being adsorbed at the bottom or/and the top of the core package, so that redundant electrolyte at the bottom or/and the top of the core package can be well absorbed, and the flash voltage at the edge of the core package is improved; meanwhile, the remained trihydroxyethyl isocyanurate can be dissolved by heat of the remained trihydroxyethyl isocyanurate, absorbs heat emitted in the explosion-proof process of the core package, delays the gasification of electrolyte, prevents the explosion-proof valve from instantly bearing large air pressure, has a process when being opened, and is slowly opened, so that the capacitor can be well protected against explosion.)

1. The liquid aluminum electrolytic capacitor with the edge short circuit resistance comprises a shell and a core bag, wherein the core bag is arranged in the shell in a sealing mode through a rubber plug; the method is characterized in that: the core bag comprises anode foil, cathode foil and electrolytic paper; the bottom or/and the top of the core bag is/are adsorbed with the trihydroxyethyl isocyanurate powder.

2. The liquid aluminum electrolytic capacitor resistant to edge shorts of claim 1, wherein: the electrolytic paper extends out of the upper end and the lower end of the anode foil.

3. The liquid aluminum electrolytic capacitor resistant to edge shorts of claim 1, wherein: the outer layer of the core bag is wound with 1-2 layers of electrolytic paper and is fixed by adhesive tape or glue.

4. The method for manufacturing an edge short resistant liquid aluminum electrolytic capacitor according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:

cutting the anode foil, the cathode foil and the electrolytic paper into predetermined sizes;

riveting the anode guide pin and the anode foil, riveting the cathode guide pin and the cathode foil, and winding the anode foil, the cathode foil and the electrolytic paper which are subjected to riveting treatment into a core package;

immersing the core bag into electrolyte for impregnation;

adsorbing the trihydroxyethyl isocyanurate powder at the bottom or/and the top of the core package subjected to impregnation in the step 3);

assembling;

a sleeve;

and (5) aging.

5. The method for manufacturing the liquid aluminum electrolytic capacitor resistant to the edge short circuit according to claim 4, characterized in that: and 3) after impregnation treatment, performing centrifugation and liquid removal.

6. The method for manufacturing the liquid aluminum electrolytic capacitor resistant to the edge short circuit according to claim 4, characterized in that: and 4), putting the bottom of the core bag into the trihydroxyethyl isocyanurate powder, and adsorbing the powder.

7. The method for manufacturing the liquid aluminum electrolytic capacitor resistant to the edge short circuit according to claim 4, characterized in that: said step 4), spray-coating the powder of trihydroxyethyl isocyanurate on the top of the core bag by using a spray nozzle.

Technical Field

The invention relates to the field of aluminum electrolytic capacitors, in particular to a liquid aluminum electrolytic capacitor resistant to edge short circuit and a preparation method thereof.

Background

Capacitors are widely used in electronic products such as information electronics, instruments and meters, and electromechanical home appliances, as one of indispensable components in electronic products. The aluminum electrolytic capacitor is the most special capacitor in the capacitors and has the advantages of small volume, high power, high cost performance and the like. However, in the production process of the aluminum electrolytic capacitor, when the core package is impregnated, because the whole core package is impregnated in the electrolyte, the electrolyte is present at the bottom and the top of the core package, and after the capacitor is assembled, the phenomenon that the anode foil on the core package and the bottom of the aluminum shell are ignited is likely to occur.

In order to solve the problem, a layer of electrolytic paper can be padded at the bottom of the aluminum shell, the core package is isolated from the aluminum shell by adopting a physical isolation method, and the electrolytic paper can absorb certain electrolyte so as to reduce the possibility of short circuit between the core package and the aluminum shell. For example, in the utility model with patent No. 201620414372.3, the packing paper is between the core pack and the aluminum shell. However, the method has the disadvantages that firstly, the electrolytic paper can improve the explosion-proof pressure of the aluminum shell, and hinder the release of the internal pressure to a certain extent, so that the explosion-proof valve cracks in the opening process of the explosion-proof valve, and the explosion-proof valve cannot realize point explosion prevention, and secondly, the electrolytic paper padded at the bottom of the aluminum shell is easily punched out from the bottom of the aluminum shell when the explosion-proof valve is opened, and does not meet the requirements of the explosion-proof process. In addition, excessive electrolyte existing at the contact part of the upper part of the core bag and the colloidal particles is easy to cause edge flash fire, so that the capacitor is easy to strike fire.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a liquid aluminum electrolytic capacitor which is resistant to edge short circuit and can well realize capacitor point explosion prevention and a preparation method thereof.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: the liquid aluminum electrolytic capacitor with the edge short circuit resistance comprises a shell and a core bag, wherein the core bag is arranged in the shell in a sealing mode through a rubber plug; the core bag comprises anode foil, cathode foil and electrolytic paper; the bottom or/and the top of the core bag is/are adsorbed with the trihydroxyethyl isocyanurate powder.

In the above liquid aluminum electrolytic capacitor resistant to edge short, preferably, the electrolytic paper extends out of the upper and lower ends of the anode foil.

In the liquid aluminum electrolytic capacitor resistant to edge short circuit, preferably, the outer layer of the core package is wound with 1-2 layers of electrolytic paper and fixed by using adhesive tape or glue.

The preparation method of the edge short circuit resistant liquid aluminum electrolytic capacitor comprises the following steps:

1) cutting the anode foil, the cathode foil and the electrolytic paper into predetermined sizes;

2) riveting the anode guide pin and the anode foil, riveting the cathode guide pin and the cathode foil, and winding the anode foil, the cathode foil and the electrolytic paper which are subjected to riveting treatment into a core package;

3) immersing the core bag into electrolyte for impregnation;

4) adsorbing the trihydroxyethyl isocyanurate powder at the bottom or/and the top of the core package subjected to impregnation in the step 3);

5) assembling;

6) a sleeve;

7) and (5) aging.

In the above method for manufacturing a liquid aluminum electrolytic capacitor resistant to edge short, it is preferable that the impregnation treatment in step 3) is followed by centrifugal liquid removal.

Preferably, in the above method for preparing the liquid aluminum electrolytic capacitor resistant to the edge short, in step 4), the bottom of the core package is placed in the tris (hydroxyethyl) isocyanurate powder, and the powder is adsorbed.

In the above method for preparing the liquid aluminum electrolytic capacitor resistant to the edge short, preferably, in step 4), the tris (hydroxyethyl) isocyanurate powder is sprayed on the top of the core package by using a nozzle.

Compared with the prior art, the invention has the advantages that: according to the invention, the trihydroxyethyl isocyanurate powder is partially dissolved after being adsorbed at the bottom or/and the top of the core package, so that redundant electrolyte at the bottom or/and the top of the core package can be well absorbed, and the flash voltage at the edge of the core package is improved; meanwhile, the remained trihydroxyethyl isocyanurate can be dissolved by heat of the remained trihydroxyethyl isocyanurate, absorbs heat emitted in the explosion-proof process of the core package, delays the gasification of electrolyte, prevents the explosion-proof valve from instantly bearing large air pressure, has a process when being opened, and is slowly opened, so that the capacitor can be well protected against explosion.

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 liquid aluminum electrolytic capacitor with the edge short circuit resistance comprises a shell and a core bag, wherein the core bag is arranged in the shell in a sealing mode through a butyl rubber plug. The core bag comprises anode foil, cathode foil and electrolytic paper, wherein the electrolytic paper extends out of the upper end and the lower end of the anode foil. And the trihydroxyethyl isocyanurate powder is adsorbed at the bottom and the top of the core bag.

When cutting the anode foil, burr is often formed at the cutting position, so that point discharge is easily generated at the cutting position when the product is used, the anode foil is conducted with the aluminum shell, or the anode foil is conducted with the cathode foil, and the capacitor is damaged. Through the design that the electrolytic paper stretches out the upper and lower both ends of anode foil, can increase the distance of anode foil and aluminium shell, separate anode foil and negative pole foil better simultaneously, reduced the influence of tip discharge to the condenser.

In this embodiment, the method for manufacturing the liquid aluminum electrolytic capacitor resistant to the edge short circuit includes the following steps:

(1) the anode foil, cathode foil and electrolytic paper are cut to the specified size of the capacitor as designed.

(2) And riveting the anode guide pin with the anode foil, and riveting the cathode guide pin with the cathode foil. And then stacking the anode foil, the cathode foil and the electrolytic paper together, enabling the electrolytic paper to extend out of the upper end and the lower end of the anode foil, and winding the anode foil, the cathode foil and the electrolytic paper into a core package by using a winding machine. After winding, 1-2 layers of electrolytic paper are wound on the outer layer of the core bag and fixed by using an adhesive tape.

(3) And immersing the core bag into electrolyte, and performing impregnation treatment on the core bag by using a hydraulic impregnation device so that the electrolyte is fully impregnated on the electrolytic paper. And after impregnation treatment, performing centrifugal liquid removal, and throwing away redundant electrolyte outside the core bag.

(4) And (4) placing the core package treated in the step (3) into the trihydroxyethyl isocyanurate powder, so that the powder enters the bottom of the core package, and the powder is fully adsorbed to the bottom of the core package. And after the bottom adsorption is finished, spraying the trihydroxyethyl isocyanurate powder on the top of the core bag by using a nozzle.

(5) And (4) assembling the core package treated in the step (4) on an assembling machine, and shaking off the redundant trihydroxyethyl isocyanurate powder through a vibrating disk of the assembling machine in the assembling process.

(6) And sleeving the assembled and sealed capacitor with a sleeve.

(7) And applying voltage to the capacitor sleeved with the insulating sleeve, aging in an aging machine, and obtaining a product after aging is completed.

According to the liquid aluminum electrolytic capacitor resistant to the edge short circuit, the trihydroxyethyl isocyanurate powder is adsorbed at the bottom and the top of the core package, and redundant electrolyte on the bottom and the top of the core package can be well absorbed through partial dissolution of the trihydroxyethyl isocyanurate powder, so that the flash voltage at the edge of the core package is improved; meanwhile, the remained trihydroxyethyl isocyanurate can be dissolved by heat of the remained trihydroxyethyl isocyanurate, absorbs heat emitted in the explosion-proof process of the core package, delays the gasification of electrolyte, prevents the explosion-proof valve from instantly bearing large air pressure, has a process when being opened, and is slowly opened, so that the capacitor can be well protected against explosion.