US-12626870-B2 - Core package, aluminum electrolytic capacitor and packaging method thereof

US12626870B2US 12626870 B2US12626870 B2US 12626870B2US-12626870-B2

Abstract

The present disclosure provides a core package, an aluminum electrolytic capacitor and a packaging method thereof. The core package includes a plurality of first electrode foils and second electrode foils laminated one on another, each of the first electrode foils is an anode foil a cathode foil, and the second electrode foil is the other. Among the plurality of first electrode foils, a first conductive foil is arranged at the edge of each of the first electrode foils, a first portion of the first conductive foil is electrically coupled to the corresponding first electrode foil, and a second portion of the first conductive foil extends and protrudes relative to the corresponding first electrode foil; and the plurality of first conductive foils are connected to a first conductive foil strip through the second portion; and an oxide film is formed on a surface of the first conductive foil.

Inventors

Bo Liu
Lihua AI
Liang AI
Anan Wang

Assignees

HUNAN AIHUA HOLDINGS CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220824
Priority Date: 20220729

Claims (19)

1 . A core package, comprising: a plurality of first electrode foils and a plurality of second electrode foils laminated one on another, wherein every two adjacent first electrode foils are spaced by one of the plurality of second electrode foils, every two adjacent second electrode foils are spaced by one of the plurality of first electrode foils, the first electrode foil and the second electrode foil adjacent to each other are spaced by an electrolytic paper; and each of the first electrode foils is either of an anode foil and a cathode foil, and each of the second electrode foils is the other of the anode foil and the cathode foil; wherein among the plurality of first electrode foils, a first conductive foil is arranged at an edge of each of the first electrode foils, a first portion of the first conductive foil is electrically coupled to the corresponding first electrode foil, and a second portion of the first conductive foil extends and protrudes relative to the corresponding first electrode foil; and a plurality of first conductive foils are connected to one first conductive foil strip through the second portions; and wherein an oxide film is formed on a surface of the first conductive foil; wherein each of the first electrode foils comprises a main body portion and an electrode tab portion formed integrally, the electrode tab portion protrudes relative to an edge of the main body portion, and the first portion of the first conductive foil is connected to the first electrode foil through the electrode tab portion; and wherein the electrode tab portions of the plurality of first electrode foils are staggered in sequence along a first direction.
2 . The core package according to claim 1 , wherein among the plurality of second electrode foils, a second conductive foil is arranged at an edge of each of the second electrode foils, a first portion of the second conductive foil is electrically coupled to the corresponding second electrode foil, and a second portion of the second conductive foil extends and protrudes relative to the corresponding second electrode foil; and a plurality of the second conductive foils is connected to one second conductive foil strip through the second portions; and wherein an oxide film is formed on a surface of the second conductive foil.
3 . The core package according to claim 1 , wherein the first conductive foil is made of pure aluminum material, and properties of the oxide film on the surface of the first conductive foil are the same as that of an oxide film on a surface of the first electrode foil.
4 . The core package according to claim 1 , wherein the oxide film is formed on the surface of the first conductive foil through a chemical formation process, and the chemical formation process used for forming the oxide film on the surface of the first conductive foil is the same as that for forming the oxide film on the surface of the first electrode foil.
5 . The core package according to claim 1 , wherein the first electrode foil is the anode foil and the second electrode foil is the cathode foil; and each of the cathode foils comprises a main body portion and an electrode tab portion formed integrally, the electrode tab portion protrudes relative to an edge of the main body portion, and the plurality of cathode foils are connected to one third conductive foil strip through the electrode tab portions.
6 . The core package according to claim 1 , wherein the plurality of first conductive foils are arranged in sequence along a first direction, and the second portions of two adjacent first conductive foils are attached to each other.
7 . The core package according to claim 1 , wherein a thickness of the first conductive foil ranges from 5 μm to 50 μm.
8 . An aluminum electrolytic capacitor, comprising the core package according to claim 1 .
9 . The aluminum electrolytic capacitor according to claim 8 , wherein the aluminum electrolytic capacitor further comprises a first shell made of aluminum material with an opening at one end, and the core package is arranged inside the first shell; and the opening is provided with a first packaging cover plate, the first packaging cover plate is provided with a wiring post, and the first conductive foil strip is connected to the wiring post on the first packaging cover plate.
10 . The aluminum electrolytic capacitor according to claim 9 , wherein a size and a shape of the first shell are compatible with that of the core package.
11 . The aluminum electrolytic capacitor according to claim 8 , wherein the aluminum electrolytic capacitor further comprises a packaging bag made of an aluminum-plastic film, the packaging bag is formed as an accommodation cavity, an edge of the accommodation cavity is sealed, the core package is sealed inside the packaging bag, and the first conductive foil strip extends to the outside of the packaging bag by passing through a first sealing edge of the packaging bag.
12 . The aluminum electrolytic capacitor according to claim 11 , wherein the aluminum electrolytic capacitor further comprises a second shell made of the aluminum material with an opening at one end, and the packaging bag containing the core package is arranged inside the second shell; and a second packaging cover plate is arranged at the opening, a wiring post is arranged on the second packaging cover plate, and the first conductive foil strip is connected to the wiring post on the second packaging cover plate.
13 . The aluminum electrolytic capacitor according to claim 12 , wherein the packaging bag further comprises an airbag structure spaced apart from the accommodation cavity through an isolation strip; the isolation strip is provided with an exhaust structure connecting the airbag structure with the accommodation cavity; and inside the second shell, the airbag structure is arranged at one side of the accommodation cavity, and a direction from the accommodation cavity to the airbag structure is the direction along which the plurality of first electrode foils and the plurality of second electrode foils are laminated one on another.
14 . The aluminum electrolytic capacitor according to claim 13 , wherein a pressing clip is further arranged inside the second shell, the pressing clip holds the accommodation cavity, and the airbag structure is arranged at one side of the pressing clip.
15 . The aluminum electrolytic capacitor according to claim 13 , wherein the isolation strip is opposite to the first sealing edge of the packaging bag, or the isolation strip is arranged at a side of the first sealing edge adjacent to the isolation strip.
16 . The aluminum electrolytic capacitor according to claim 11 , wherein the aluminum electrolytic capacitor further comprises a second shell formed integrally, the packaging bag is arranged inside the second shell, the first conductive foil strip extends to the outside of the second shell, and the first conductive foil strip is sealed and insulated from the second shell.
17 . The aluminum electrolytic capacitor according to claim 11 , wherein a width of a second sealing edge of the packaging bag is greater than a width of the first sealing edge; and the second sealing edge is arranged at both sides of the first sealing edge.
18 . A packaging method, applied to the aluminum electrolytic capacitor according to claim 8 , wherein the method comprises: arranging the core package in an accommodation cavity of a packaging bag, a first conductive foil strip of the core package protruding out of an opening of the packaging bag, the packaging bag is made of an aluminum-plastic film; and thermally sealing the packaging bag at the opening to form a first sealing edge, and connection colloid on the first conductive foil strip is thermally sealed with the packaging bag.
19 . The packaging method according to claim 18 , wherein the packaging bag further comprises an airbag structure spaced apart from the accommodation cavity through a sealing isolation strip, the sealing isolation strip is provided with an exhaust structure connecting the airbag structure with the accommodation cavity, and the method further comprises: folding the airbag structure to one side of the packaging bag; arranging the packaging bag with the folded airbag structure in a second shell; arranging a second packaging cover plate at the opening of the second shell and connecting the first conductive foil strip with a wiring post on the second packaging cover plate; and sealing the second packaging cover plate to seal the packaging bag inside the second shell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the U.S. national phase of PCT Application No. PCT/CN2022/114490 filed on Aug. 24, 2022 which claims priority to Chinese Patent Application No. 202210904879.7 filed on Jul. 29, 2022, the disclosures of which are incorporated in their entirety by reference herein. TECHNICAL FIELD The present disclosure relates to the field of capacitor technology, in particular to a core package, an aluminum electrolytic capacitor and a packaging method thereof. BACKGROUND A traditional aluminum electrolytic capacitor is usually made of winding core package, which is assembled with aluminum shell, rubber plug and other accessories after immersion. With the miniaturization and flattening of electronic products, the traditional cylindrical aluminum electrolytic capacitor has no advantage in space utilization and restricts the development of miniaturization and flattening of the electronic products. Based on the application limitation of cylindrical aluminum electrolytic capacitors, square aluminum electrolytic capacitors have been developed in the market, which can effectively meet the requirements of miniaturization and flat structure of electronic products. However, performance of aluminum electrolytic capacitors may not be achieved through a capacitance extraction structure of an anode foil and a cathode foil in the current square aluminum electrolytic capacitor. In the prior art, for example, due to properties of anode foil material, it is difficult to realize a direct connection between a conductive foil strip for capacitance extraction and an anode foil, and the structure of the anode foil is damaged; for another example, a connection portion between the conductive foil strip and the anode foil is heated due to current accumulation. As a result, the performance of aluminum electrolytic capacitors may not be achieved. SUMMARY An object of the present disclosure is to provide a core package, an aluminum electrolytic capacitor and a packaging method thereof, so as to solve the problem that the performance of aluminum electrolytic capacitors may not be achieved through the capacitance extraction structure of the square aluminum electrolytic capacitors in the prior art. The present disclosure provides in some embodiments a core package, including a plurality of first electrode foils and a plurality of second electrode foils laminated one on another, wherein every two adjacent first electrode foils are spaced by one of the plurality of second electrode foils, every two adjacent second electrode foils are spaced by one of the plurality of first electrode foils, the first electrode foil and the second electrode foil adjacent to each other are spaced by an electrolytic paper; and each of the first electrode foils is either of an anode foil and a cathode foil, and each of the second electrode foils is the other of the anode foil and the cathode foil. Among the plurality of first electrode foils, a first conductive foil is arranged at an edge of each of the first electrode foils, a first portion of the first conductive foil is electrically coupled to the corresponding first electrode foil, and a second portion of the first conductive foil extends and protrudes relative to the corresponding first electrode foil; and a plurality of first conductive foils are connected to one first conductive foil strip through the second portion. An oxide film is formed on a surface of the first conductive foil. In a possible embodiment of the present disclosure, among the plurality of second electrode foils, a second conductive foil is arranged at an edge of each of the second electrode foils, a first portion of the second conductive foil is electrically coupled to the corresponding second electrode foil, and a second portion of the second conductive foil extends and protrudes relative to the corresponding second electrode foil; and a plurality of second conductive foils are connected to one second conductive foil strip through the second portion. An oxide film is formed on a surface of the second conductive foil. In a possible embodiment of the present disclosure, the first conductive foil is made of pure aluminum, and properties of the oxide film on the surface of the first conductive foil are the same as properties of an oxide film on a surface of the first electrode foil. In a possible embodiment of the present disclosure, the oxide film is formed on the surface of the first conductive foil through a chemical formation process, and the chemical formation process used for forming the oxide film on the surface of the first conductive foil is the same as a chemical formation process used for forming the oxide film on the surface of the first electrode foil. In a possible embodiment of the present disclosure, the first electrode foil is the anode foil and the second electrode foil is the cathode foil; and each of the cathode foils includes a main body portion and an electrode tab portion fo