阅读说明：本技术 一种铝电解电容器及其制作方法 (Aluminum electrolytic capacitor and manufacturing method thereof ) 是由 尹志华 李良 尹超 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种铝电解电容器及其制作方法,包括铝极板、金属铝壳、设置于铝极板与金属铝壳之间的高分子聚合物层以及封装于金属铝壳一端的封装盖板；其中,所述铝极板包括有复数个铝粉颗粒,每个所述铝粉颗粒的铝晶界中渗透有碳晶体的碳须,多个铝粉颗粒之间具有不规则的间隙；所述铝极板还包括有导电金属导针,导电金属导针包括有铝舌以及引出导针,所述铝舌埋设在所述铝粉颗粒中,所述引出导针用于作为铝电解电容器的正极。本发明铝电解电容器及其制作方法可大大提升铝电解电容器的性能。(The invention discloses an aluminum electrolytic capacitor and a manufacturing method thereof, wherein the aluminum electrolytic capacitor comprises an aluminum polar plate, a metal aluminum shell, a high polymer layer arranged between the aluminum polar plate and the metal aluminum shell, and a packaging cover plate packaged at one end of the metal aluminum shell; the aluminum polar plate comprises a plurality of aluminum powder particles, carbon whiskers of carbon crystals penetrate into an aluminum crystal boundary of each aluminum powder particle, and irregular gaps are formed among the aluminum powder particles; the aluminum polar plate also comprises a conductive metal guide pin, the conductive metal guide pin comprises an aluminum tongue and a leading-out guide pin, the aluminum tongue is embedded in the aluminum powder particles, and the leading-out guide pin is used as the anode of the aluminum electrolytic capacitor. The aluminum electrolytic capacitor and the manufacturing method thereof can greatly improve the performance of the aluminum electrolytic capacitor.)

1. An aluminum electrolytic capacitor is characterized by comprising an aluminum pole plate, a metal aluminum shell, a high polymer layer arranged between the aluminum pole plate and the metal aluminum shell and a packaging cover plate packaged at one end of the metal aluminum shell; the aluminum polar plate comprises a plurality of aluminum powder particles, carbon whiskers of carbon crystals penetrate into an aluminum crystal boundary of each aluminum powder particle, and irregular gaps are formed among the aluminum powder particles; the aluminum polar plate also comprises a conductive metal guide pin, the conductive metal guide pin comprises an aluminum tongue and a leading-out guide pin, the aluminum tongue is embedded in the aluminum powder particles, and the leading-out guide pin is used as the anode of the aluminum electrolytic capacitor.

2. The aluminum electrolytic capacitor of claim 1 wherein: one end of the metal aluminum shell is provided with an opening, and the aluminum polar plate provided with the metal guide pin is placed in the aluminum shell through the opening.

3. The aluminum electrolytic capacitor of claim 2 wherein: the other end of the metal aluminum shell is sealed, and a cathode guide pin is led out from one sealed end.

4. The aluminum electrolytic capacitor of claim 3 wherein: and a high-molecular conductive polymer is filled between the metal aluminum shell and the aluminum pole plate, and the high-molecular conductive polymer is combined with the aluminum shell into a whole after polymerization reaction.

5. The aluminum electrolytic capacitor of claim 1 wherein: an oxide film is formed on the surface of the aluminum powder particles, and the size of the aluminum powder particles is 3nm-0.5 mm.

6. A manufacturing method of an aluminum electrolytic capacitor is characterized by comprising the following steps:

s1, providing a pure anode aluminum polar plate, wherein the aluminum polar plate is obtained by doping and mixing organic powder and aluminum powder and performing vacuum high-temperature carbonization;

s2, performing electrochemical energizing to obtain a cell body;

and S3, packaging the cell body to obtain the aluminum electrolytic capacitor.

7. The method for manufacturing an aluminum electrolytic capacitor as claimed in claim 6, wherein the step S1 includes:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

s11, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

and S12, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film on the surface of the battery core casting body to obtain the pure anode aluminum plate.

8. The method for manufacturing an aluminum electrolytic capacitor as claimed in claim 6, wherein the step S2 further comprises the steps of: and infiltrating and filling a high molecular polymer into the pure anode aluminum polar plate to form a high molecular polymer layer, and arranging a negative electrode foil on the surface of the high molecular polymer layer to lead out the cathode of the aluminum electrolytic capacitor.

9. The method for manufacturing an aluminum electrolytic capacitor as claimed in claim 7, wherein the step S11 further comprises monitoring the die casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that no carbonization occurs in the organic powder in the composite powder.

10. The method for manufacturing an aluminum electrolytic capacitor as claimed in claim 7, wherein in step S2, the aluminum plate is subjected to ethanol immersion ultrasonic cleaning, ash powder formed by the organic powder being burned in the high temperature carbonization process is melted and precipitated, and then electrochemical energization is performed.

Technical Field

The invention belongs to the technical field of aluminum electrolytic capacitors, and particularly relates to an aluminum electrolytic capacitor and a manufacturing method thereof.

Background

The capacitor has a function of storing electric energy and instantly discharging the electric energy, and is an indispensable electronic component in the fields of electronics and power. The capacitor is widely applied to circuits such as power supply filtering, signal coupling, resonance, direct current isolation and the like, makes a contribution to the rapid development of modern electronic technology that the capacitor cannot be worn out, is also widely applied to electronic equipment such as household electrical appliances and computers, and is an irreplaceable electronic component in the electrical and electronic industries.

Among the capacitors, the aluminum electrolytic capacitor is the most commonly used device, and generally includes an anode foil, a cathode foil and an electrolytic paper, which are wound together to form a capacitor core package. At present, most of anode foils are corrosion foils, and although the corrosion foils can increase the surface area of the anode foils, the increased area is limited, so that the final performance improvement of the aluminum electrolytic capacitor is limited.

With the maturity of powder metallurgy technology, the powder metallurgy technology is used in a plurality of metal part rough blank preparation processes, generally is simple substance metal or alloy metal, and the processing technology is mature, after the powder is extruded and formed, the powder is calcined in a high-temperature vacuum to a crystallization state or a crystal boundary tends to a stable state, and then the temperature is reduced for finish machining, so that the process is efficient, high in quality and high in added value. Therefore, if the processing technology can be combined into the electrode production of the aluminum electrolytic capacitor, the performance of the aluminum electrolytic capacitor can be greatly improved.

The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.

Disclosure of Invention

The present invention is directed to an aluminum electrolytic capacitor and a method for manufacturing the same, which solves at least one of the above problems.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:

an aluminum electrolytic capacitor comprises an aluminum pole plate, a metal aluminum shell, a high polymer layer arranged between the aluminum pole plate and the metal aluminum shell, and a packaging cover plate packaged at one end of the metal aluminum shell; the aluminum polar plate comprises a plurality of aluminum powder particles, carbon whiskers of carbon crystals penetrate into an aluminum crystal boundary of each aluminum powder particle, and irregular gaps are formed among the aluminum powder particles; the aluminum polar plate also comprises a conductive metal guide pin, the conductive metal guide pin comprises an aluminum tongue and a leading-out guide pin, the aluminum tongue is embedded in the aluminum powder particles, and the leading-out guide pin is used as the anode of the aluminum electrolytic capacitor.

In some embodiments, an opening is provided at one end of the metal aluminum case, and the aluminum plate mounted with the metal guide pin is placed in the aluminum case through the opening.

In some embodiments, the other end of the metal aluminum case is sealed, and a cathode guide pin is led out from one sealed end.

In some embodiments, a high molecular conductive polymer is filled between the metal aluminum shell and the aluminum electrode plate, and the high molecular conductive polymer is integrated with the aluminum shell after a polymerization reaction.

In some embodiments, the surface of the aluminum powder particles is formed with an oxide film, and the size of the aluminum powder particles is 3nm-0.5 mm.

The technical scheme of another embodiment of the invention is as follows:

a manufacturing method of an aluminum electrolytic capacitor comprises the following steps:

s1, providing a pure anode aluminum polar plate, wherein the aluminum polar plate is obtained by doping and mixing organic powder and aluminum powder and performing vacuum high-temperature carbonization;

s2, performing electrochemical energizing to obtain a cell body;

and S3, packaging the cell body to obtain the aluminum electrolytic capacitor.

In some embodiments, step S1 includes:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

s11, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

and S12, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film on the surface of the battery core casting body to obtain the pure anode aluminum plate.

In some embodiments, step S2 further includes the steps of: and infiltrating and filling a high molecular polymer into the pure anode aluminum polar plate to form a high molecular polymer layer, and arranging a negative electrode foil on the surface of the high molecular polymer layer to lead out the cathode of the aluminum electrolytic capacitor.

In some embodiments, the step S11 further includes monitoring the die casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that no carbonization occurs in the organic powder in the composite powder.

In some embodiments, in step S2, the aluminum electrode plate is subjected to ethanol soaking ultrasonic cleaning, ash powder formed by organic powder cremation during high-temperature carbonization is melted and separated, and then electrochemical energization is performed.

The technical scheme of the invention has the beneficial effects that:

compared with the prior art, the aluminum electrolytic capacitor and the manufacturing method thereof can greatly improve the performance of the aluminum electrolytic capacitor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of FIG. 1;

FIG. 3 is an exploded schematic view of the aluminum plates of the aluminum electrolytic capacitor of FIG. 1;

FIG. 4 is a schematic view of a metal aluminum case of the aluminum electrolytic capacitor of FIG. 1;

FIG. 5 is another schematic structural diagram of an aluminum electrolytic capacitor according to an embodiment of the present invention;

fig. 6 is a flow chart of a method for manufacturing an aluminum electrolytic capacitor according to another embodiment of the invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer and more obvious, so that those skilled in the art can better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, "plurality" means two or more, and the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 3, an aluminum electrolytic capacitor 100 according to an embodiment of the present invention includes an aluminum plate 10, a metal aluminum case 20, a polymer layer 30 disposed between the aluminum plate 10 and the metal aluminum case 20, and a sealing cover plate 40 sealed at one end of the metal aluminum case 20; the aluminum polar plate 10 comprises a plurality of aluminum powder particles 101, carbon whiskers of carbon crystals penetrate into an aluminum grain boundary of each aluminum powder particle 101, and irregular gaps are formed among the aluminum powder particles 101; the aluminum electrode plate 10 further includes a conductive metal pin 102, the conductive metal pin 102 includes an aluminum tongue 1021 and a lead-out pin 1022, the aluminum tongue 1021 is embedded in the aluminum powder particles 101, and the lead-out pin 1022 is used as an anode of the aluminum electrolytic capacitor 100.

Referring to fig. 4, specifically, an opening is formed at one end of the metal aluminum case 20, and the aluminum plate 10 with the metal guide pin 1022 mounted thereon is placed in the aluminum case 20 through the opening; the other end of the aluminum case 20 is sealed, and a cathode guide pin 21 is led out at the sealed end. In some embodiments, the aluminum electrode plate 10 has a square shape, and the aluminum case 20 has a square shape corresponding to the aluminum electrode plate 10; it will be appreciated that in other embodiments, the aluminum plate may have other shapes, such as a cylindrical shape, as shown in fig. 5, and the aluminum shell 20 has a shape corresponding to the aluminum plate.

The conductive polymer material is filled between the metal aluminum shell 20 and the aluminum electrode plate 10, and in some embodiments, the conductive polymer material is a polymer, and the polymer is integrated with the aluminum shell after a polymerization reaction.

In some embodiments, the surface of the aluminum powder particles is formed with an oxide film, and the size of the aluminum powder particles is 3nm-0.5 mm.

Referring to fig. 6, as another embodiment of the present invention, a method for manufacturing an aluminum electrolytic capacitor is provided, including the steps of:

s1, providing a pure anode aluminum polar plate, wherein the aluminum polar plate is obtained by doping and mixing organic powder and aluminum powder and performing vacuum high-temperature carbonization;

specifically, the method comprises the following steps:

s10, mixing the organic powder with aluminum powder to obtain composite powder;

wherein the particle sizes of the aluminum powder and the organic powder are 3nm-0.5 mm; in one embodiment, the aluminum powder and the organic powder are uniformly mixed by a wet doping process to obtain a composite powder; specifically, aluminum powder and organic powder are mixed through a solvent, then the solvent is quickly separated out and dried to obtain a mixture of the aluminum powder and the organic powder, and the mixture is ground into powder to obtain composite powder.

In one embodiment, the aluminum powder and the organic powder are uniformly mixed by a dry doping process; specifically, the aluminum powder and the organic powder are directly stirred and mixed in a vibration mode through a mixer, the organic powder is adsorbed onto aluminum metal particles to obtain composite powder, and the composite powder is collected and packaged through a composite powder collector. The pollution degree in the dry doping process is small, and the dispersion is sufficient. In some embodiments, the organic powder is a starch (halogen-free, gluten-free) powder.

S11, carrying out die-casting molding on the composite powder to obtain a battery core casting body consisting of pills;

specifically, a current collector is placed into a prefabricated battery core die, wherein the current collector comprises a conductive metal guide pin, a conductive foil and the like; taking a current collector as a conductive metal guide pin as an example for explanation, the conductive metal guide pin is placed into a pre-manufactured battery cell mold, the composite powder is filled in the battery cell mold to wrap an aluminum tongue of the metal guide pin, and then the composite powder is die-cast through high pressure, so as to obtain a battery cell cast body formed by pills of the composite powder.

When the composite powder is subjected to high-pressure die casting, the pressure is converted into heat, organic matter powder in the composite powder is carbonized, and aluminum powder is recrystallized and precipitated, so that the composite powder is changed in quality, the pressure precision needs to be strictly controlled in the process of die casting the composite powder under high pressure, and the pressure precision requirement is high; in some examples, the step S11 further includes monitoring the die casting of the composite powder in real time, and controlling the pressure according to the monitored information to ensure that no carbonization occurs in the organic powder in the composite powder.

S12, carrying out vacuum high-temperature carbonization on the die-cast battery core casting body, then oxidizing, and forming an oxide film on the surface of the battery core casting body to obtain a pure aluminum anode plate;

in some embodiments, the die-cast battery core casting is subjected to vacuum high-temperature carbonization, specifically, the battery core casting is placed into a graphite mold groove cavity, and is placed into a carbonization process furnace for high-temperature baking, wherein the baking temperature is 180 ℃ to 350 ℃, and the baking time is 1 to 10 hours; and (3) carrying out high-temperature vacuum carbonization on the organic powder, enabling carbon whiskers of the carbon crystals to grow and penetrate into aluminum grain boundaries, and completing solid crystal filling (filling gaps among the aluminum grain boundaries).

In some embodiments, the die-cast battery core casting is subjected to high-temperature vacuum carbonization and graphene generation, specifically, the battery core casting is placed in a graphite mold groove cavity, and is placed in a carbonization process furnace to be subjected to high-temperature vacuum baking carbonization, wherein the baking temperature is 180 ℃ to 350 ℃, and the baking time is 1 hour to 10 hours. And transferring the carbon whisker to a high-temperature high-pressure CVD (chemical vapor deposition) vacuum furnace, performing a graphene generation process, specifically, further growing a conductive graphene tube in the carbon whisker of the carbon crystal subjected to vacuum carbonization at the temperature of 600-680 ℃ to form a high-conductivity cathode, and completing solid crystal (aluminum crystal boundary gap) filling. The electric conductor composed of the carbon whiskers, the carbon crystals and the graphene tube directly serves as a main body for the attachment and adsorption of the cathode low-conductivity electrolyte, plays a role in surface electrification of the anode in subsequent cathode extraction, and is connected with the metal conductor to form a good cathode.

S2, performing electrochemical energizing to obtain a cell body;

forming the pure anode aluminum polar plate obtained in the step S12 to obtain a cell body; specifically, the soot formed from the carbonized organic powder is dissolved and precipitated, and then electrochemically energized. Specifically, the aluminum electrode plate obtained in step S12 is subjected to ethanol soaking and ultrasonic cleaning, ash powder formed by organic powder cremation in the high-temperature carbonization process is melted and precipitated, and then electrochemical energization is performed. In some embodiments, the electrochemical energizing process comprises electrically oxidizing the aluminum electrode plate in an acid solution of adipic acid, boric acid, or a mixture thereof to grow an α -phase aluminum oxide dielectric film, wherein the film thickness of the dielectric film determines the withstand voltage and the specific volume. The size of the enabling current is 5% -30% of the current-carrying limit capacity of the aluminum pole plate, the enabling voltage is not provided with an upper limit, and in practical application, the voltage is applied from 3VDC to 2000 VDC. It should be noted that, during the energization process, the volume of the aluminum plate has a swelling phenomenon, which is a process of maximizing the specific volume of the aluminum-polarized anode due to the growth of the oxide film to enlarge the aluminum plate. In some embodiments, S2 further includes: and infiltrating and filling a high molecular polymer into the pure anode aluminum polar plate to form a high molecular polymer layer, and arranging a negative electrode foil on the surface of the high molecular polymer layer to lead out the cathode of the aluminum electrolytic capacitor. Wherein the negative foil is a corrosion foil, a carbon whisker foil or a super capacitor plate. In some embodiments, the negative foil is provided with a lead or current collecting foil to lead out the cathode of the aluminum electrolytic capacitor.

S3, packaging the cell body to obtain the aluminum electrolytic capacitor;

specifically, a metal aluminum shell is provided, a high-molecular conductive polymer is wrapped on the surface of the cell body, the cell body is filled into the metal aluminum shell, a conductive high-molecular material is filled in the metal aluminum shell, and the high-molecular conductive polymer is combined with the aluminum shell into a whole after polymerization reaction to form a cathode and a lead-out metal electrode of the capacitor; finally, the anode end face is packaged through epoxy resin or rubber particles, and the anode terminal transition section is wrapped in the sealing rubber head; various pin-shaped terminals are led out from the positive electrode and the negative electrode by resistance welding extension to obtain the aluminum electrolytic capacitor.

It is to be understood that the foregoing is a more detailed description of the invention as it relates to specific/preferred embodiments and that no limitation to the specific embodiments is intended as being implied by the limitation presented herein. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the present patent. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.

In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the invention as defined by the appended claims.

Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. One of ordinary skill in the art will readily appreciate that the above-disclosed, presently existing or later to be developed, processes, machines, manufacture, compositions of matter, means, methods, or steps, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.