A laminated solid aluminum electrolytic capacitor with good sealing

Abstract

The application discloses a laminated solid aluminum electrolytic capacitor with good sealing performance, which comprises an insulating shell, a core, sealing glue, an anode lead-out sheet and a cathode lead-out sheet, the core is sealed in the insulating shell through the sealing glue; one end of the anode lead-out sheet is electrically connected with an anode end of the core, and the other end of the anode lead-out sheet is exposed outside the insulating shell or the sealing glue; one end of the cathode lead-out sheet is electrically connected with a cathode end of the core, and the other end of the cathode lead-out sheet is exposed outside the insulating shell or the sealing glue. In the application, the plastic shell and the sealing glue are used to replace the plastic sealing material for packaging, so that water vapor can be better prevented from entering the product interior, one side of a pad section of the anode lead-out sheet and the cathode lead-out sheet is close to the insulating shell, and the other side of the pad section is exposed, tin paste can cover the joint between the pad section and the sealing glue when surface mounting, so that water vapor can be reduced from entering the core interior from the joint between the electrode terminal and the plastic sealing material, and the high-humidity resistance of the aluminum electrolytic capacitor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a solid-state aluminum electrolytic capacitor, in particular to a laminated solid-state aluminum electrolytic capacitor with good sealing performance. BACKGROUND

[0002] Compared with liquid aluminum electrolytic capacitors, the laminated solid-state aluminum electrolytic capacitor has the advantages of smaller size, smaller equivalent series resistance (ESR), wider temperature range, and environmental protection, etc., meets the development trend of miniaturization and high frequency of electronic products, and meets the requirements of surface mount technology (SMT).

[0003] As shown in the patent (202122073854.0), the laminated solid-state aluminum electrolytic capacitor takes a single capacitor core as a basic unit, the single positive electrode end includes a porous aluminum foil and an aluminum oxide dielectric layer formed on the surface of the porous aluminum foil, the negative electrode end includes a porous aluminum foil and an aluminum oxide dielectric layer formed on the surface thereof, a solid-state electrolyte first cathode formed on the surface of the dielectric layer, a carbon layer and a silver layer (i.e. a second cathode and a third cathode) formed on the solid-state electrolyte. The single positive electrode end and the positive electrode lead terminal are welded together, and the single negative electrode end and the negative electrode lead terminal are laminated and bonded together through a metal paste. A plurality of single pieces are laminated on the above single piece laminated body to form a multi-layer laminated body, and the laminated body is packaged with plastic sealing material and is attached to the lower surface of the laminated solid-state capacitor by bending twice, thereby forming a laminated solid-state aluminum electrolytic capacitor.

[0004] Since the plastic sealing material itself is not completely waterproof and has water absorption, and after reflow soldering during mounting, due to the different expansion coefficients between the plastic sealing material and the lead terminal, thermal expansion and contraction may cause gaps at the junction. Under high temperature and high humidity conditions, water vapor or air can pass through the gaps at the junction and enter the core inside the product, resulting in deterioration of product performance. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a laminated solid-state aluminum electrolytic capacitor with good sealing performance.

[0006] To solve the above technical problems, the technical solution provided by the present application is as follows: a laminated solid-state aluminum electrolytic capacitor with good sealing performance, comprising an insulating shell, a core, a sealing glue, an anode lead-out sheet and a cathode lead-out sheet, the core is sealed in the insulating shell by the sealing glue; one end of the anode lead-out sheet is electrically connected to the anode end of the core, and the other end of the anode lead-out sheet is exposed outside the insulating shell or the sealing glue, one end of the cathode lead-out sheet is electrically connected to the cathode end of the core, and the other end of the cathode lead-out sheet is exposed outside the insulating shell or the sealing glue.

[0007] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0008] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0009] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0010] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0011] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0012] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0013] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0014] The sealed laminated solid aluminum electrolytic capacitor has the advantages that the sealing glue is filled in the insulating shell, and the core is filled in the insulating shell by the sealing glue.

[0015] Preferably, the silver paste layers of the cathode ends of the adjacent two single pieces are electrically connected together after the plurality of single pieces are stacked together, and the anode ends of the adjacent two single pieces are connected together through the welding frit.

[0016] Compared with the prior art, the advantages of the present application are as follows: in the present application, the product is packaged by the plastic shell and the sealing glue instead of the plastic packaging material, so that the water vapor can be better prevented from entering the product, one side of the pad section of the anode lead-out piece and the cathode lead-out piece is close to the insulating shell, and the other side is exposed, the tin paste covers the joint of the pad section and the sealing glue when the surface mounting is performed, so that the water vapor entering the core from the joint of the electrode terminal and the plastic packaging material is reduced. Meanwhile, in the present application, the anode lead-out piece and the cathode lead-out piece are in Z shape, and the connecting section of the anode lead-out piece and the cathode lead-out piece is deep into the top of the insulating shell and is electrically connected with the cathode end and the anode end of the core, so that the distance of the water vapor entering the core from the joint of the anode lead-out piece and the cathode lead-out piece and the sealing glue is lengthened, and the difficulty of the water vapor entering the core is increased. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a sectional view of the sealed stacked solid aluminum electrolytic capacitor of the embodiment 1.

[0018] Figure 2 FIG. 2 is a bottom view of the sealed stacked solid aluminum electrolytic capacitor of the embodiment 1 before the sealing glue is filled.

[0019] Figure 3 FIG. 3 is a top view of the sealed stacked solid aluminum electrolytic capacitor of the embodiment 1.

[0020] LEGEND

[0021] 1, insulating shell; 2, core; 21, isolation glue; 22, valve metal foil; 23, oxide film; 24, high molecular conductive polymer layer; 25, carbon layer; 26, silver paste layer; 27, welding frit; 3, sealing glue; 4, cathode lead-out piece; 5, cathode lead-out piece; 6, connecting section; 7, lead-out section; 8, pad section; 9, conductive paste; 10, welding hole. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described in more detail below in combination with the drawings of the specification and the preferred embodiments, but the protection scope of the present application is not limited to the following specific embodiments.

[0023] It needs to be particularly pointed out that when a certain element is described as "fixed to, fixedly connected to, connected to or communicated with" another element, it can be directly fixed, fixedly connected, connected or communicated with the other element, or indirectly fixed, fixedly connected, connected or communicated with the other element through other intermediate connecting elements.

[0024] Unless otherwise defined, all the professional terms used below have the same meaning as commonly 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 protection scope of the present application.

[0025] Embodiment 1

[0026] As shown in Figure 1 and Figure 2 , a laminated solid aluminum electrolytic capacitor with good sealing includes an insulating shell 1, a core 2, a sealing glue 3, an anode lead-out sheet 4 and a cathode lead-out sheet 5, the core 2 is sealed in the insulating shell 1 by the sealing glue 3; one end of the anode lead-out sheet 4 is electrically connected to the anode end of the core 2, and the other end of the anode lead-out sheet 4 is exposed outside the insulating shell 1 or the sealing glue 3; one end of the cathode lead-out sheet 5 is electrically connected to the cathode end of the core 2, and the other end of the cathode lead-out sheet 5 is exposed outside the insulating shell 1 or the sealing glue 3. In this embodiment, the sealing glue 3 is filled in the insulating shell 1, and the core 2 is filled in the insulating shell 1 by the sealing glue 3. In this embodiment, the sealing glue 3 can be epoxy resin glue.

[0027] In this embodiment, the structures of the anode lead-out sheet 4 and the cathode lead-out sheet 5 are similar. The anode lead-out sheet 4 and the cathode lead-out sheet 5 are both Z-shaped; the anode lead-out sheet 4 and the cathode lead-out sheet 5 both include a connecting section 6, a lead-out section 7 and a solder pad section 8, the connecting section 6 of the anode lead-out sheet 4 and the connecting section 6 of the cathode lead-out sheet 5 are respectively electrically connected to the anode end and the cathode end of the core 2, and the solder pad sections 8 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 are both exposed outside the insulating shell 1 and the sealing glue 3.

[0028] In this embodiment, as shown in Figure 1 , the connecting section 6, the lead-out section 7 and the solder pad section 8 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 are integrally formed, that is, the connecting section 6, the lead-out section 7 and the solder pad section 8 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 are all a piece of sheet bent into Z shape. One side of the connecting section 6 of the anode lead-out sheet 4 is inlaid into the inner wall of the bottom surface of the insulating shell, and the other side is connected to the anode end through the conductive paste 9; one side of the lead-out section 7 of the anode lead-out sheet 4 is inlaid into the vertical side wall of the insulating shell 1, and the other side is sealingly connected to the sealing glue 3; the solder pad section 8 of the anode lead-out sheet 4 is exposed outside the sealing glue 3. Figure 1 and Figure 3As shown, one side of the pad section 8 of the anode lead-out piece 4 is close to the insulating shell, and the other side is exposed. The structure of the cathode lead-out piece 5 is similar to that of the anode lead-out piece 4. One side of the connecting section 6 of the cathode lead-out piece 5 is inlaid into the inner wall of the bottom surface of the insulating shell, and the other side is connected with the cathode end through the conductive paste 9. One side of the lead-out section 7 of the cathode lead-out piece 5 is inlaid into the vertical side wall of the insulating shell 1, and the other side is sealingly connected with the sealing glue 3. The pad section 8 of the cathode lead-out piece 5 is exposed outside the sealing glue 3.

[0029] In this embodiment, the connecting section 6 of the anode lead-out piece 4 and the cathode lead-out piece 5 can be fixedly connected with the inner wall of the bottom surface of the insulating shell through glue, and the lead-out section 7 of the anode lead-out piece 4 and the cathode lead-out piece 5 can also be fixedly connected with the vertical side wall of the insulating shell through glue.

[0030] In this embodiment, the core 2 includes one or more single pieces, and the multiple single pieces are stacked to form the core 2. The single piece includes an anode, a cathode, and a separation glue 21 arranged between the anode and the cathode. The anode includes a valve metal foil 22 and an oxide film 23 formed on the valve metal foil 22. The cathode includes the valve metal foil 22, the oxide film 23 formed on the valve metal foil 22, a high-molecular conductive polymer layer 24, and a cathode lead-out layer. The high-molecular conductive polymer layer 24 is formed on the surface of the oxide film 23, and the cathode lead-out layer is on the surface of the high-molecular conductive polymer layer 24. In this embodiment, the valve metal foil 22 is a porous aluminum foil, and the oxide film 23 is an aluminum trioxide film.

[0031] In this embodiment, as shown, Figure 1 the core 2 includes five single pieces, and the five single pieces are stacked to form the core 2. The single piece includes an anode, a cathode, and a separation glue 21 arranged between the anode and the cathode. The anode includes a valve metal foil 22 and an oxide film 23 formed on the valve metal foil 22. The cathode includes the valve metal foil 22, the oxide film 23 formed on the valve metal foil 22, a high-molecular conductive polymer layer 24, and a cathode lead-out layer. The high-molecular conductive polymer layer 24 is formed on the surface of the oxide film 23, and the cathode lead-out layer is on the surface of the high-molecular conductive polymer layer 24. In this embodiment, the valve metal foils 22 of the anode and the cathode are the same piece, and the oxide film 23 is formed on the valve metal foil 22. The cathode lead-out layer includes a carbon layer 25 and a silver paste layer 26. The carbon layer 25 is formed on the surface of the high-molecular conductive polymer layer 24, and the silver paste layer 26 is formed on the surface of the carbon layer 25.

[0032] In this embodiment, after the five single pieces are stacked together, the silver paste layers 26 of the cathode ends of the adjacent two single pieces are connected together, the anode ends of the adjacent two single pieces are connected together through the welding fusion body 27, and the anode is welded with the welding fusion body 27 through the welding hole 10. In this embodiment, the silver paste layer 26 can be replaced by a conductive glue layer.

[0033] In the preparation of the sealed laminated solid aluminum electrolytic capacitor of the present embodiment, the anode lead-out sheet 4 and the cathode lead-out sheet 5 are fixedly connected to the inner wall of the insulating shell 1 at predetermined positions, and then the anode end and the cathode end of the core 2 are electrically connected to the connecting section 6 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 through the conductive paste 9. Finally, epoxy resin glue is filled for glue sealing.

[0034] In the present embodiment, the plastic shell and sealing glue 3 are used to replace the plastic sealing material for packaging, which can better prevent water vapor from entering the product interior. One side of the pad section 8 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 is tightly attached to the insulating shell, and the other side is exposed. When surface mounting, the solder paste will cover the joint between the pad section 8 and the sealing glue 3, which can reduce the entry of water vapor into the core 2 from the joint between the electrode terminal and the plastic sealing material. Meanwhile, in the present application, the anode lead-out sheet 4 and the cathode lead-out sheet 5 are in Z shape, and the connecting section 6 of the anode lead-out sheet 4 and the cathode lead-out sheet 5 extends to the top of the insulating shell and is electrically connected to the anode end and the cathode end of the core 2. In this way, the distance of water vapor entering the core 2 through the joint between the anode lead-out sheet 4 and the cathode lead-out sheet 5 and the filled glue is lengthened, thereby increasing the difficulty of water vapor entering the core 2.

Claims

1. A stacked solid electrolytic aluminum electrolytic capacitor with excellent sealing property, characterized by: The application relates to an anode and cathode lead-out sheet of a capacitor, which comprises an insulating shell, a core, sealing glue, an anode lead-out sheet and a cathode lead-out sheet, the core is sealedly arranged in the insulating shell through the sealing glue; one end of the anode lead-out sheet is electrically connected with an anode end of the core, and the other end of the anode lead-out sheet is exposed outside the insulating shell or the sealing glue; one end of the cathode lead-out sheet is electrically connected with a cathode end of the core, and the other end of the cathode lead-out sheet is exposed outside the insulating shell or the sealing glue. The anode lead-out sheet and the cathode lead-out sheet are both in Z-shape; the anode lead-out sheet and the cathode lead-out sheet both comprise a connecting section, a lead-out section and a solder pad section; the connecting sections of the anode lead-out sheet and the cathode lead-out sheet are respectively electrically connected with the anode end and the cathode end of the core; and the solder pad sections of the anode lead-out sheet and the cathode lead-out sheet are both exposed outside the insulating shell and the sealing glue. One side of the connecting section of the anode lead-out sheet is inlaid into the inner wall of the bottom surface of the insulating shell, and the other side is connected with the anode end through conductive paste; one side of the lead-out section of the anode lead-out sheet is inlaid into the vertical side wall of the insulating shell, and the other side is sealingly connected with the sealing glue; and the solder pad section of the anode lead-out sheet is exposed outside the sealing glue. One side of the connecting section of the cathode lead-out sheet is inlaid into the inner wall of the bottom surface of the insulating shell, and the other side is connected with the cathode end through conductive paste; one side of the lead-out section of the cathode lead-out sheet is inlaid into the vertical side wall of the insulating shell, and the other side is sealingly connected with the sealing glue; and the solder pad section of the cathode lead-out sheet is exposed outside the sealing glue.

2. The sealed stacked solid electrolytic capacitor of claim 1 wherein: The sealing glue is filled in the insulating shell, and the sealing glue fills the core in the insulating shell.

3. The sealed stacked solid electrolytic capacitor of claim 1 wherein: The connecting section of the cathode lead-out sheet is connected with the cathode end of the core through conductive paste, and the connecting section of the anode lead-out sheet is connected with the anode end of the core through conductive paste or welding.

4. The sealed stacked solid electrolytic capacitor of any one of claims 1 to 3, wherein: The core comprises one or more single pieces, and the multiple single pieces are stacked to form the core; the single piece comprises an anode, a cathode and isolation glue, the isolation glue is arranged between the anode and the cathode; the anode comprises a valve metal foil and an oxide film formed on the valve metal foil; the cathode comprises a valve metal foil, an oxide film formed on the valve metal foil, a polymer conductive polymer layer and a cathode lead-out layer, the polymer conductive polymer layer is formed on the surface of the oxide film, and the cathode lead-out layer is on the surface of the polymer conductive polymer layer.

5. The sealed stacked solid electrolytic capacitor of claim 4 wherein: The cathode lead-out layer comprises a carbon layer and a conductive glue layer, the carbon layer is formed on the surface of the polymer conductive polymer layer, and the conductive glue layer is formed on the surface of the carbon layer.

6. The sealed stacked solid electrolytic capacitor of claim 5 wherein: After the multiple single pieces are stacked together, the conductive glue layers of the cathode ends of the adjacent two single pieces are connected together, and the anode ends of the adjacent two single pieces are connected together through welding fusion.

7. The sealed stacked solid electrolytic capacitor of claim 4 wherein: The cathode lead-out layer comprises a carbon layer and a silver paste layer, the carbon layer is formed on the surface of the polymer conductive polymer layer, and the silver paste layer is formed on the surface of the carbon layer.

8. The sealed stacked solid electrolytic capacitor of claim 7 wherein: After the multiple single pieces are stacked together, the silver paste layers of the cathode ends of the adjacent two single pieces are electrically connected together, and the anode ends of the adjacent two single pieces are connected together through welding fusion.

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