A high humidity resistant laminated aluminum electrolytic capacitor and a manufacturing method thereof

Abstract

A high-humidity resistant laminated aluminum electrolytic capacitor includes a core, an anode guide pin, a cathode guide pin and a sealing assembly, wherein the core is arranged in the sealing assembly, the anode guide pin and the cathode guide pin are respectively connected to the core and extend out of the sealing assembly; the sealing assembly includes a metal shell and a metal base plate; the metal shell is sealed and connected to the metal base plate, the metal base plate is provided with two through holes, and a rubber pad with a middle opening is provided in the through hole; the core is mounted on the metal base plate, and an insulating gasket is provided between the core and the metal base plate; the anode guide pin and the cathode guide pin on the core respectively pass through the rubber pad and extend out of the metal base plate. The present invention adopts a metal sealing assembly to replace the original plastic sealing material, has better waterproofness, and improves the moisture resistance of the capacitor.

Description

Technical Field

[0001] The invention relates to an aluminum electrolytic capacitor, in particular to a high-humidity resistant laminated aluminum electrolytic capacitor and a manufacturing method thereof. Background Art

[0002] The laminated solid aluminum electrolytic capacitor uses solid conductive polymer instead of liquid electrolyte, and the core is connected in parallel in a stacked manner. Compared with liquid aluminum electrolytic capacitors, the manufactured capacitor has many advantages such as smaller size, smaller equivalent series resistance (ESR), wider temperature range and more environmental protection. It conforms to the development trend of miniaturization and high frequency of electronic products and meets the requirements of surface mount technology (SMT).

[0003] However, the plastic packaging material of traditional laminated solid aluminum electrolytic capacitors is hygroscopic, and there may be gaps between the plastic packaging material and the lead terminals. Therefore, under high temperature and high humidity conditions, water vapor or air can pass through the gap between the plastic packaging material body and the joint and enter the core, causing the product characteristics to deteriorate.

[0004] The Chinese patent application number CN202011070838.X "A manufacturing method for improving the high temperature and high humidity tolerance of multilayer aluminum electrolytic capacitors" discloses the following manufacturing method for improving the high temperature and high humidity tolerance of multilayer aluminum electrolytic capacitors: by immersing the encapsulated capacitor in a silicone solution to allow the silicone to enter the interior of the plastic encapsulation material, and then curing it at high temperature to allow the silicone to fill the gaps between the molding material particles and the gaps between the plastic encapsulation material and the lead terminals, thereby playing a role in preventing air and water, and preventing water vapor or air from passing through the gaps into the core, causing product characteristics to deteriorate.

[0005] However, the capacitor plastic packaging material in this patent is also water-absorbent; and multiple immersion in liquid and baking also increase the potential risk of deterioration of product performance parameters. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-humidity resistant laminated aluminum electrolytic capacitor.

[0007] In order to solve the above technical problems, the technical solution proposed by the present invention is: a high humidity resistant laminated aluminum electrolytic capacitor, comprising a core, an anode guide pin, a cathode guide pin and a sealing assembly, wherein the core is arranged in the sealing assembly, and the anode guide pin and the cathode guide pin are respectively connected to the core and extend out of the sealing assembly;

[0008] The sealing assembly comprises a metal shell and a metal base plate; the metal shell is sealed and connected to the metal base plate, the metal base plate is provided with two through holes, and a rubber pad with a middle opening is provided in the through holes;

[0009] The core is mounted on a metal base plate, and an insulating gasket is arranged between the core and the metal base plate; the anode guide pin and the cathode guide pin on the core respectively pass through the rubber pad and extend out of the metal base plate.

[0010] In the above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor, preferably, a sealing insulating glue is filled between the anode guide pin and the rubber pad, and between the cathode guide pin and the rubber pad; the sealing insulating glue includes one of silica gel or glass glue.

[0011] In the above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor, preferably, the sealing insulating adhesive is doped with silicon dioxide or aluminum oxide particles.

[0012] The above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor is preferably filled with nitrogen.

[0013] In the above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor, preferably, the core includes a plurality of single sheets stacked together; the single sheet includes an anode terminal, a cathode terminal, and a shielding rubber wire located between the anode terminal and the cathode terminal.

[0014] The above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor is preferably provided with a rubber seat plate at the bottom of the metal seat plate, and a groove is provided on the rubber seat plate. After the anode guide pin and the cathode guide pin extend out of the metal seat plate and the rubber seat plate, they are bent and arranged in the groove.

[0015] The method for manufacturing the above-mentioned high humidity resistant laminated aluminum electrolytic capacitor comprises the following steps:

[0016] (1) stacking the anode ends of the single sheets together and stacking the cathode ends together;

[0017] (2) electrically connecting the anode terminal of the single chip to the anode guide pin, and electrically connecting the cathode terminal of the single chip to the cathode guide pin;

[0018] (3) Insert the anode guide pin and cathode guide pin through the holes of the rubber pad on the metal base plate respectively;

[0019] (4) an insulating gasket is arranged between the core and the metal base plate to fix the core to the metal base plate;

[0020] (5) Nest the metal shell on the metal base plate and seal the metal shell and the metal base plate.

[0021] In the above-mentioned method for manufacturing the high-humidity resistant laminated aluminum electrolytic capacitor, preferably, the step (3) further comprises, after the anode guide pin and the cathode guide pin are passed through the holes of the rubber pad, filling the gap between the guide pin and the rubber pad with a sealing insulating adhesive.

[0022] In the method for manufacturing the above-mentioned high-humidity resistant laminated aluminum electrolytic capacitor, preferably, the step (5) further comprises, when the metal shell and the metal base plate are sealed, filling nitrogen into the metal shell.

[0023] In the above-mentioned method for manufacturing the high-humidity resistant laminated aluminum electrolytic capacitor, preferably, the step (5) further comprises inserting and fixing a rubber base plate under the metal base plate, and then bending and fixing the anode guide pin and the cathode guide pin in the groove at the bottom of the rubber base plate.

[0024] Compared with the prior art, the present invention has the advantages that: the present invention adopts a metal sealing component to replace the original plastic sealing material for packaging, which can better prevent water vapor from entering the interior of the product, thereby improving the moisture resistance of the laminated aluminum electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of the high-humidity resistant multilayer aluminum electrolytic capacitor in Example 1.

[0026] Figure 2 Schematic diagram of the single chip structure in Example 1.

[0027] Figure 3 Top view of the metal seat plate in Example 1.

[0028] Figure 4 Top view of the rubber seat plate in Example 1.

[0029] Figure 5 A cross-sectional view of the high-humidity resistant multilayer aluminum electrolytic capacitor in Example 2.

[0030] Legend

[0031] 1. Core; 11. Monolithic; 111. Porous aluminum foil; 112. Aluminum oxide; 113. Shielding rubber wire; 114. High molecular polymer layer; 115. Carbon layer; 116. Silver layer; 2. Anode guide pin; 3. Cathode guide pin; 4. Sealing assembly; 41. Metal shell; 42. Metal seat plate; 5. Rubber pad; 6. Silicone gel; 7. Rubber seat plate; 8. Insulating gasket; 9. Welding block; 10. Nitrogen. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully in combination with preferred embodiments below, but the protection scope of the present invention is not limited to the following specific embodiments.

[0033] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.

[0034] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, the high humidity resistant laminated aluminum electrolytic capacitor in this embodiment includes a core 1, an anode guide pin 2, a cathode guide pin 3 and a sealing assembly 4. The core 1 is arranged in the sealing assembly 4. The anode guide pin 2 and the cathode guide pin 3 are respectively connected to the core 1 and extend out of the sealing assembly 4. The entire sealing assembly 4 is filled with nitrogen 10. The nitrogen 10 is used to discharge the air in the capacitor, which can prevent the oxidation of the components in the capacitor and extend the service life of the capacitor. At the same time, the nitrogen 10 filled in the sealing assembly 4 can also be used to detect whether the air tightness of the entire capacitor is good, which is convenient for screening defective products.

[0037] The sealing assembly 4 includes a metal shell 41 and a metal base plate 42. The metal shell 41 is inverted and sealedly connected to the metal base plate 42. The metal base plate 42 is provided with two through holes, and a rubber pad 5 with a middle opening is provided in the two through holes. A rubber base plate 7 of the same size as the metal base plate 42 is connected to the bottom of the metal base plate 42, and two grooves are provided on the rubber base plate 7. The use of the rubber pad 5 and the rubber base plate 7 can prevent the guide pin from contacting the metal base plate 42, and avoid the guide pin and the metal base plate 42 from being short-circuited.

[0038] The core 1 is integrally mounted on the metal base plate 42, and an insulating gasket 8 is disposed between the core 1 and the metal base plate 42. The insulating gasket 8 isolates the core 1 from the metal base plate 42 to prevent the core 1 from being electrically connected to the metal base plate 42.

[0039] like Figure 2 As shown, the core 1 includes a plurality of single sheets 11 stacked together, the single sheet 11 includes an anode terminal, a cathode terminal and a shielding rubber wire 113 located between the anode terminal and the cathode terminal. The single sheet 11 as a whole is based on a porous aluminum foil 111, a layer of aluminum oxide 112 is formed on the surface of the porous aluminum foil 111, and the cathode terminal of the single sheet 11 also includes a polymer layer 114, a carbon layer 115 and a silver layer 116 from the inside to the outside.

[0040] like Figure 3 and Figure 4As shown, the anode guide pin 2 connected to the anode end of the single chip 11 passes through the rubber pad 5 and extends out of the metal seat plate 42 and the rubber seat plate 7, and is bent and embedded in the groove of the rubber seat plate 7. The cathode guide pin 3 connected to the cathode end of the single chip 11 passes through the rubber pad 5 and extends out of the metal seat plate 42 and the rubber seat plate 7, and is bent and embedded in the groove of the rubber seat plate 7. Silica gel 6 is filled between the positive cathode guide pin 3 and the rubber pad 5, and silica gel 6 is also doped with silica particles. The use of silica gel 6 doped with silica particles to fill the gap between the guide pin and the rubber pad 5 can well enhance the airtightness of the capacitor, prevent water vapor and air from entering the capacitor, and keep the various parameters and performances of the capacitor stable.

[0041] The manufacturing method of the high humidity resistant laminated aluminum electrolytic capacitor in this embodiment includes the following steps:

[0042] (1) The anode ends of all the single sheets 11 are stacked together, and the cathode ends are stacked together.

[0043] (2) The anode end of the single chip 11 is welded to the anode guide pin 2 using the welding block 9, and the cathode end is bonded to the cathode guide pin using a conductive metal paste.

[0044] (3) The anode guide pin 2 and the cathode guide pin 3 are respectively passed through the holes of the rubber pad 5 on the metal base plate 42, and the gap between the guide pin and the rubber pad 5 is filled with silica gel 6 doped with silicon dioxide particles.

[0045] (4) An insulating gasket 8 is provided between the core 1 and the metal base plate 42 , and the core 1 is fixed to the metal base plate 42 .

[0046] (5) The metal shell 41 is nested on the metal base plate 42, and nitrogen 10 is filled into the metal shell 41, and then the metal shell 41 and the metal base plate 42 are sealed by resistance welding. After the sealing is completed, the rubber base plate 7 is inserted under the metal base plate 42 and fixed, and then the anode guide pin 2 and the cathode guide pin 3 are bent and fixed in the groove at the bottom of the rubber base plate 7.

[0047] Example 2

[0048] like Figure 5 As shown, the difference between the high-humidity resistant laminated aluminum electrolytic capacitor in this embodiment and that in Embodiment 1 is that no groove is provided on the rubber seat plate 7, and the anode guide pin 2 and the cathode guide pin 3 only need to extend more than 2 mm after passing through the rubber pad 5 of the metal seat plate 42 and the rubber seat plate 7, so that the extended anode guide pin 2 and the cathode guide pin 3 can be electrically connected to the circuit board.

[0049] The manufacturing method of the high-humidity resistant laminated aluminum electrolytic capacitor in this embodiment is different from that in Embodiment 1 in that step (5) is changed to: inserting the metal shell 41 into the metal base plate 42, filling the metal shell 41 with nitrogen 10, and then sealing the metal shell 41 and the metal base plate 42 by resistance welding. After the sealing is completed, the rubber base plate 7 is inserted under the metal base plate 42 and fixed, and then the anode guide pin 2 and the cathode guide pin 3 are sheared so that the anode guide pin 2 and the cathode guide pin 3 extend out of the bottom surface of the rubber base plate 7 by more than 2 mm.

Claims

1. A high humidity resistant multilayer aluminum electrolytic capacitor, characterized in that: It comprises a core, an anode guide pin, a cathode guide pin and a sealing assembly, wherein the core is arranged in the sealing assembly, and the anode guide pin and the cathode guide pin are respectively connected to the core and extend out of the sealing assembly; The sealing assembly comprises a metal shell and a metal base plate; the metal shell is sealed and connected to the metal base plate, the metal base plate is provided with two through holes, and a rubber pad with a middle opening is provided in the through holes; The core is mounted on a metal base plate, and an insulating gasket is arranged between the core and the metal base plate; the anode guide pin and the cathode guide pin on the core respectively pass through the rubber pad and extend out of the metal base plate; The core comprises a plurality of single sheets stacked together; the single sheet comprises an anode terminal, a cathode terminal and a shielding rubber wire located between the anode terminal and the cathode terminal; A rubber seat plate is arranged at the bottom of the metal seat plate, and a groove is arranged on the rubber seat plate. After the anode guide pin and the cathode guide pin extend out of the metal seat plate and the rubber seat plate, they are bent and arranged in the groove.

2. The high humidity resistant multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: Sealing insulating glue is filled between the anode guide pin and the rubber pad, and between the cathode guide pin and the rubber pad; the sealing insulating glue includes one of silica gel or glass glue.

3. The high humidity resistant multilayer aluminum electrolytic capacitor according to claim 2, characterized in that: The sealing insulating adhesive is doped with silicon dioxide or aluminum oxide particles.

4. The high humidity resistant multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The metal shell is filled with nitrogen.

5. The method for manufacturing a high-humidity resistant multilayer aluminum electrolytic capacitor according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) stacking the anode ends of the single sheets together and stacking the cathode ends together; (2) electrically connecting the anode terminal of the single chip to the anode guide pin, and electrically connecting the cathode terminal of the single chip to the cathode guide pin; (3) Insert the anode guide pin and cathode guide pin through the holes of the rubber pad on the metal base plate respectively; (4) an insulating gasket is arranged between the core and the metal base plate to fix the core to the metal base plate; (5) Nest the metal shell on the metal base plate and seal the metal shell and the metal base plate.

6. The method for manufacturing a high-humidity resistant multilayer aluminum electrolytic capacitor according to claim 5, characterized in that: The step (3) further includes, after the anode guide pin and the cathode guide pin are passed through the holes of the rubber pad, filling the gap between the guide pin and the rubber pad with a sealing insulating adhesive.

7. The method for manufacturing a high-humidity resistant multilayer aluminum electrolytic capacitor according to claim 5, characterized in that: The step (5) further includes filling nitrogen into the metal shell when the metal shell and the metal base plate are sealed.

8. The method for manufacturing a high-humidity resistant multilayer aluminum electrolytic capacitor according to claim 5, characterized in that: The step (5) further includes inserting a rubber base plate under the metal base plate and fixing it, and then bending the anode guide pin and the cathode guide pin and fixing them in the groove at the bottom of the rubber base plate.

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