Electrolyte tantalum capacitor with fully-sealed structure

Abstract

The utility model discloses an electrolyte tantalum capacitor with a fully-sealed structure, which belongs to the technical field of capacitors, and comprises an anode flat block, a resin filling shell coated outside the anode flat block and electrodes connected with two ends of the anode flat block, and mounting grooves are arranged at the ends of the resin filling shell close to the electrodes. According to the utility model, the two ends of the resin filling shell are respectively provided with the mounting grooves, and the interiors of the mounting grooves are filled with the montmorillonite nano-composite filling layers formed by compounding the montmorillonite and the organic resin, so that nano particles can form a zigzag path in the resin by utilizing the characteristics of a lamellar structure of the nano montmorillonite, and the nano particles can form a zigzag path in the resin; in addition, the surface of the electrode is provided with an arc-shaped groove and an arc-shaped protrusion, so that the contact area between the electrode and the montmorillonite nanometer composite filling layer is further increased, the moisture permeation path is prolonged, and the moisture-proof effect of the full-sealing structure of the capacitor is better.

Description

Technical Field

[0001] The utility model relates to an electrolyte tantalum capacitor, in particular to an electrolyte tantalum capacitor with a fully sealed structure, belonging to the technical field of capacitors. Background Art

[0002] In the prior art, a moisture-proof chip solid electrolyte tantalum capacitor is disclosed in the utility model with the application number 202020840585.9. In order to solve the problem that due to the inconsistent coefficient of thermal expansion between materials, the contact between layers will change poorly, resulting in peeling and delamination or bursting inside the capacitor. When the degree of damage is serious, the appearance of the capacitor will be deformed, cracked, etc. (usually called "popcorn") phenomenon, and the electrical performance of the capacitor will be affected or fail. By setting a moisture-proof layer that wraps the tantalum core, the moisture-proof effect is achieved, preventing water vapor from penetrating into the tantalum core, making the overall moisture-proof performance of the capacitor more excellent, and reducing its failure rate in high-temperature and high-humidity working environments. When this capacitor is in a high-temperature and high-humidity working environment for a long time, it has good moisture-proof performance and higher reliability.

[0003] There are still deficiencies similar to the above application:

[0004] Tantalum wires are led out from the side of the anode tantalum block. The tantalum wires pass through the moisture-proof layer and enter the inside of the resin-filled shell to connect with the electrode. If there are gaps, pores or incomplete encapsulation at the joint between the electrode and the tantalum wire wrapped by the resin, moisture will have the opportunity to enter the capacitor through these tiny defects. Therefore, only using a single moisture-proof layer for sealing and moisture-proofing has a poor use effect;

[0005] Therefore, an electrolyte tantalum capacitor with a fully sealed structure is designed to optimize the above problems. Content of the Utility Model

[0006] The main purpose of the present utility model is to provide an electrolyte tantalum capacitor with a fully sealed structure. By respectively opening installation grooves at both ends of the resin-filled housing, and filling a montmorillonite nano-composite filling layer composed of montmorillonite and organic resin in the installation grooves, utilizing the characteristics of the self-layer structure of nano-montmorillonite, nano-particles can form tortuous paths in the resin, extending the penetration path of moisture and thus reducing the penetration rate. Additionally, by opening arc-shaped grooves and arc-shaped protrusions on the surface of the electrode, the contact area between the electrode and the montmorillonite nano-composite filling layer is further increased, extending the moisture penetration path, and the moisture-proof effect of the fully sealed structure of the capacitor is better. The resin-filled housing is composed of an inner fluororesin layer, an aluminum oxide vapor deposition layer, and an outer polycarbonate layer. The outer polycarbonate layer increases the overall packaging strength, while the aluminum oxide vapor deposition layer and the inner fluororesin layer have good water vapor barrier properties, ensuring the packaging effect and the overall water vapor isolation performance.

[0007] The purpose of the present utility model can be achieved by adopting the following technical solutions:

[0008] An electrolyte tantalum capacitor with a fully sealed structure, comprising an anode tantalum block, a resin-filled housing wrapped around the outside of the anode tantalum block, and electrodes connected to both ends of the anode tantalum block. Installation grooves are respectively opened at positions of the resin-filled housing near the electrodes at both ends, and montmorillonite nano-composite filling layers are provided inside the installation grooves, and the electrodes pass through the inside of the montmorillonite nano-composite filling layers.

[0009] Preferably: The montmorillonite nano-composite filling layer includes montmorillonite nano-particles and organic resin, and the montmorillonite nano-particles are mixed inside the organic resin.

[0010] Preferably: Limiting grooves are respectively opened on both sides of the installation grooves, and the montmorillonite nano-composite filling layer is filled inside the limiting grooves.

[0011] Preferably: Arc-shaped grooves are uniformly opened along the length direction on the top and bottom of the electrode, and the arc-shaped grooves are parallel to the width direction of the electrode.

[0012] Preferably: Arc-shaped protrusions are provided between adjacent arc-shaped grooves on the top of the electrode, and the arc-shaped protrusions are parallel to the length direction of the arc-shaped grooves.

[0013] Preferably: The resin-filled housing includes an inner fluororesin layer, an aluminum oxide vapor deposition layer, and an outer polycarbonate layer. The inner fluororesin layer is wrapped around the outside of the anode tantalum block, the aluminum oxide vapor deposition layer is provided on the outside of the inner fluororesin layer, and the outer polycarbonate layer is wrapped around the outside of the aluminum oxide vapor deposition layer.

[0014] Preferably: A fiberglass layer is provided between the bottom end of the electrode and the bottom of the outer polycarbonate layer.

[0015] The beneficial effects of the present utility model are:

[0016] A tantalum electrolytic capacitor with a fully sealed structure provided by the present utility model has mounting grooves respectively opened at both ends of a resin-filled outer shell, and a montmorillonite nano composite filling layer composed of montmorillonite and organic resin is filled inside the mounting grooves. By utilizing the characteristics of the lamellar structure of nano montmorillonite itself, nano particles can form tortuous paths in the resin, extending the penetration path of moisture and thus reducing the penetration rate. In addition, by opening arc-shaped grooves and arc-shaped protrusions on the surface of the electrode, the contact area between the electrode and the montmorillonite nano composite filling layer is further increased, and the moisture penetration path is extended, so that the moisture-proof effect of the fully sealed structure of the capacitor is better;

[0017] The resin-filled outer shell is composed of an inner fluororesin layer, an aluminum oxide vapor deposition layer, and an outer polycarbonate layer. The outer polycarbonate layer is used to increase the overall packaging strength, while the aluminum oxide vapor deposition layer and the inner fluororesin layer have good water vapor barrier properties, ensuring the packaging effect and the overall water vapor isolation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front sectional view of the present utility model;

[0019] Figure 2 of the present utility model Figure 1 is the enlarged view at A in;

[0020] Figure 3 is the electrode structure diagram of the present utility model.

[0021] In the figure: 1, anode tantalum block; 2, inner fluororesin layer; 3, aluminum oxide vapor deposition layer; 4, outer polycarbonate layer; 5, electrode; 6, mounting groove; 7, limiting groove; 8, montmorillonite nano composite filling layer; 9, arc-shaped groove; 10, arc-shaped protrusion; 11, glass fiber layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the technical solutions of the present utility model clearer and more definite for those skilled in the art, the present utility model will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present utility model are not limited thereto.

[0023] As Figures 1-3 shown, this embodiment provides a tantalum electrolytic capacitor with a fully sealed structure, including an anode tantalum block 1, a resin-filled outer shell covering the outside of the anode tantalum block 1, and electrodes 5 connected to both ends of the anode tantalum block 1. Mounting grooves 6 are opened at positions of the resin-filled outer shell near the electrodes 5 at both ends, and montmorillonite nano composite filling layers 8 are provided inside the mounting grooves 6. The montmorillonite nano composite filling layer 8 includes montmorillonite nano particles and organic resin, and the montmorillonite nano particles are mixed inside the organic resin. The electrodes 5 pass through the inside of the montmorillonite nano composite filling layer 8.

[0024] Overall working principle: The outer side of the tantalum capacitor is fully sealed by a resin-filled housing to ensure the sealing effect during use. The electrode 5 passes through the inside of the resin-filled housing and penetrates out from the inside of the montmorillonite nanocomposite filler layer 8. The montmorillonite nanocomposite filler layer 8 is composed of montmorillonite and organic resin. Utilizing the characteristics of the self-layered structure of nano-montmorillonite, the nanoparticles can form tortuous paths in the resin, extending the penetration path of moisture and thus reducing the penetration rate.

[0025] In this embodiment, limiting grooves 7 are provided on both sides of the installation groove 6, and the montmorillonite nanocomposite filler layer 8 is filled inside the limiting grooves 7.

[0026] Local working principle: Through the setting of the limiting grooves 7, the stability after the montmorillonite nanocomposite filler layer 8 is filled can be ensured.

[0027] In this embodiment, arc-shaped grooves 9 are uniformly provided along the length direction at the top and bottom of the electrode 5, and the arc-shaped grooves 9 are parallel to the width direction of the electrode 5.

[0028] Local working principle: The arc-shaped grooves 9 on the surface of the electrode 5 increase the contact area between the electrode 5, the montmorillonite nanocomposite filler layer 8, and the resin-filled housing, not only increasing the stability, but also extending the penetration path of moisture and further reducing the penetration rate.

[0029] In this embodiment, arc-shaped protrusions 10 are provided at the top of the electrode 5 and between adjacent arc-shaped grooves 9, and the arc-shaped protrusions 10 are parallel to the length direction of the arc-shaped grooves 9.

[0030] Local working principle: The setting of the arc-shaped protrusions 10 on the surface of the electrode 5 further increases the contact area between the electrode 5, the montmorillonite nanocomposite filler layer 8, and the resin-filled housing, increases the stability, extends the penetration path of moisture, and further reduces the penetration rate.

[0031] In this embodiment, the resin-filled housing includes a fluororesin inner layer 2, an alumina vapor deposition layer 3, and a polycarbonate outer layer 4. The fluororesin inner layer 2 wraps around the outside of the anode tantalum block 1. An alumina vapor deposition layer 3 is provided on the outside of the fluororesin inner layer 2, and the polycarbonate outer layer 4 wraps around the outside of the alumina vapor deposition layer 3.

[0032] Local working principle: The polycarbonate outer layer 4 is used to increase the overall encapsulation strength. The alumina vapor deposition layer 3 and the fluororesin inner layer 2 have good water vapor barrier properties, ensuring the encapsulation effect and the overall water vapor isolation performance.

[0033] In this embodiment, a fiberglass layer 11 is provided between the bottom end of the electrode 5 and the bottom of the polycarbonate outer layer 4.

[0034] Local working principle: The use of the fiberglass layer 11 for heat insulation protection can prevent the performance of the capacitor from being damaged by excessive temperature shock during welding.

[0035] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and concept of the present invention, makes equivalent substitutions or changes, all belong to the protection scope of the present invention.

Claims

1. An electrolyte tantalum capacitor with a fully sealed structure, comprising an anode block (1), a resin-filled shell covering the outside of the anode block (1), and electrodes (5) connected to both ends of the anode block (1), characterized in that: A mounting groove (6) is provided at the end of the resin-filled shell near the electrode (5), a montmorillonite nanocomposite filling layer (8) is provided inside the mounting groove (6), and the electrode (5) passes through the inside of the montmorillonite nanocomposite filling layer (8).

2. The electrolytic tantalum capacitor with a fully sealed structure according to claim 1, characterized in that: The montmorillonite nanocomposite filling layer (8) comprises montmorillonite nanoparticles and an organic resin, wherein the montmorillonite nanoparticles are mixed inside the organic resin.

3. The electrolytic tantalum capacitor with a fully sealed structure according to claim 2, characterized in that: Limiting grooves (7) are provided on both sides of the installation groove (6), and the montmorillonite nanocomposite filling layer (8) is filled inside the limiting grooves (7).

4. The electrolytic tantalum capacitor with a fully sealed structure according to claim 3, characterized in that: The top and bottom of the electrode (5) are evenly provided with arc-shaped grooves (9) along the length direction, and the arc-shaped grooves (9) are parallel to the width direction of the electrode (5).

5. The electrolytic tantalum capacitor with a fully sealed structure according to claim 4, characterized in that: An arc-shaped protrusion (10) is provided at the top of the electrode (5) and between adjacent arc-shaped grooves (9), and the arc-shaped protrusion (10) is parallel to the length direction of the arc-shaped groove (9).

6. An electrolyte tantalum capacitor with a fully sealed structure according to any one of claims 1 to 5, characterized in that: The resin-filled shell comprises a fluororesin inner layer (2), an aluminum oxide vapor deposition layer (3) and a polycarbonate outer layer (4); the fluororesin inner layer (2) is wrapped around the outside of the anode tank (1); the aluminum oxide vapor deposition layer (3) is arranged on the outer side of the fluororesin inner layer (2); and the aluminum oxide vapor deposition layer (3) is wrapped on the outer side of the polycarbonate outer layer (4).

7. The electrolytic tantalum capacitor with a fully sealed structure according to claim 6, characterized in that: A glass fiber layer (11) is provided between the bottom end of the electrode (5) and the bottom of the polycarbonate outer layer (4).

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