Wave edge moisture barrier metallized film

Abstract

The utility model relates to the field of film capacitor discloses a wave edge moistureproof metallized film, including base film, the one side of base film is provided with metal plating, the one side of metal plating is provided with protective layer, the one side of protective layer is provided with plasma layer, the one side of metal plating is provided with high resistance part, the one side of metal plating is provided with low resistance part, the quality of metal plating is zinc aluminium, pure aluminium, aluminium zinc aluminium, copper zinc aluminium, aluminium magnesium among any one, the one side of base film away from metal plating is provided with plasma layer, the water drop angle theta of protective layer surface is 60~120 DEG. In the utility model, improve film moistureproof performance through the effect of protective layer and plasma layer, improve film self -healing and withstand voltage through the structure of metal plating, and under the effect of base film wave edge, enhance the contact firmness of the gold -spraying layer and core end face, improve the difficulty of moisture from the gold -spraying layer and core end face interface immersion, and then improve product overall life.

Description

Technical Field

[0001] This utility model relates to the field of thin film capacitors, and in particular to a wave-edge moisture-proof metallized thin film. Background Technology

[0002] Film capacitors are capacitors that use thin film materials as dielectrics and are widely used in electronic devices. Their structure typically consists of two conductor electrodes and a thin dielectric layer. Common materials for the dielectric layer include polyester, polypropylene, and polyimide. Film capacitors have good electrical performance and stability, and their dielectric constant is relatively high, enabling them to store a large amount of electrical energy in a small volume. Compared with electrolytic capacitors, film capacitors have lower leakage current, longer lifespan, and a wider operating temperature range, making them suitable for use in high-frequency and high-temperature environments.

[0003] Film capacitors have strong voltage withstand capability and are suitable for applications such as coupling, filtering and decoupling. They can effectively improve circuit performance. Due to their good mechanical strength and anti-aging properties, film capacitors are widely used in automotive electronics, communication equipment and consumer electronics.

[0004] With the increasing demands for film capacitor quality in the market, various industries have put forward dual 85-1000h testing requirements. When conducting dual 85-1000h tests, epoxy-encapsulated products with plastic shells are prone to poor capacitance decay, which is mainly caused by moisture infiltration corroding the metal plating. At the same time, the width of the low-resistivity section of the film capacitor plating on the market is generally 4mm to 8mm. Some areas of the low-resistivity section are located in the electric field region. Due to the poor self-healing property of the low-resistivity section, the capacitor is prone to breakdown in the low-resistivity section during actual operation. To address these issues, a wavy-edged moisture-proof metallized film is proposed. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides a wave-edge moisture-proof metallized film, which aims to improve the problem that traditional film capacitors are corroded by moisture and suffer poor capacity decay. At the same time, due to the poor self-healing property of the low-resistance part, the capacitor is prone to low-resistance part breakdown in actual operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wave-edge moisture-proof metallized film, comprising a base film, a metal coating on one side of the base film, a protective layer on one side of the metal coating, a plasma layer on one side of the protective layer, a high-resistivity portion on one side of the metal coating, and a low-resistivity portion on one side of the metal coating.

[0007] As a further description of the above technical solution: The metal coating is made of any one of zinc-aluminum, pure aluminum, aluminum-zinc-aluminum, copper-zinc-aluminum, or aluminum-magnesium.

[0008] As a further description of the above technical solution: One of the base films has the plasma layer on the side away from the metal coating, while the other base film does not have the plasma layer on the side away from the metal coating.

[0009] As a further description of the above technical solution: The water droplet angle θ on the surface of the protective layer is 60° to 120°.

[0010] As a further description of the above technical solution: The protective layer is made of either silicone oil or fluorinated oil.

[0011] As a further description of the above technical solution: The plasma layer is any one of nitrogen, oxygen, argon, nitrogen-oxygen, or a mixture of argon and oxygen.

[0012] As a further description of the above technical solution: The edge shape of the base film can be either a single wavy edge or a double wavy edge.

[0013] As a further description of the above technical solution: The structure of the metal coating is any one of the following: flat plate, gradient, two-step, gradient + flat plate, or three-step.

[0014] As a further description of the above technical solution: The width of the low-resistance section is a specific width.

[0015] This utility model has the following beneficial effects: In this invention, the moisture-proof performance of the film is improved by the action of the protective layer and the plasma layer; in addition, the low-resistance part of a specific width is used to ensure that the low-resistance part is not in the electric field area, thereby improving the film's pressure resistance; and the wavy edge of the base film enhances the contact reliability between the gold spray layer and the core end face, making it more difficult for moisture to penetrate from the interface between the gold spray layer and the core end face, thereby improving the overall lifespan of the product. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a wave-edge moisture-proof metallized film proposed in this utility model; Figure 2 This is a schematic diagram of the protective layer and plasma layer of a wavy edge moisture-proof metallized film proposed in this utility model; Figure 3 This is a schematic diagram of the protective layer and plasma layer of a wavy edge moisture-proof metallized film proposed in this utility model; Figure 4This is a schematic diagram of the wavy edge structure of the base film of the wavy edge moisture-proof metallized film proposed in this utility model; Figure 5 This is a schematic diagram of the wavy edge structure of the base film of the wavy edge moisture-proof metallized film proposed in this utility model; Figure 6 This is a schematic diagram of the wavy edge structure of the base film of the wavy edge moisture-proof metallized film proposed in this utility model; Figure 7 This is a schematic diagram of the wavy edge structure of the base film of the wavy edge moisture-proof metallized film proposed in this utility model; Figure 8 This is a schematic diagram of the metal coating structure of a wavy edge moisture-proof metallized film proposed in this utility model; Figure 9 This is a schematic diagram of the metal coating structure of a wavy edge moisture-proof metallized film proposed in this utility model; Figure 10 This is a schematic diagram of the metal coating structure of a wavy edge moisture-proof metallized film proposed in this utility model; Figure 11 This is a schematic diagram of the metal coating structure of a wavy edge moisture-proof metallized film proposed in this utility model.

[0017] Legend: 1. Base film; 2. Metal coating; 3. Protective layer; 4. Plasma layer; 5. High-resistivity section; 6. Low-resistivity section. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Refer to Figure 1 , Figure 3This utility model provides an embodiment of a wavy-edged moisture-proof metallized film, comprising a base film 1, a metal plating layer 2 disposed on one side of the base film 1, a protective layer 3 disposed on one side of the metal plating layer 2, a plasma layer 4 disposed on one side of the protective layer 3, a high-resistivity portion 5 disposed on one side of the metal plating layer 2, and a low-resistivity portion 6 disposed on one side of the metal plating layer 2. The protective layer 3 has anti-oxidation and anti-corrosion capabilities, and the plasma layer 4 is used to reduce the surface activity of the protective layer 3. The metal plating layer 2 is made of any one of zinc-aluminum, pure aluminum, aluminum-zinc-aluminum, copper-zinc-aluminum, or aluminum-magnesium. The water droplet angle θ on the surface of the protective layer 3 is 60° to 120°. The protective layer 3 is made of any one of silicone oil or fluorinated oil. The plasma layer 4 is any one of nitrogen, oxygen, argon, nitrogen-oxygen, or a mixture of argon and oxygen gases. The protective layer 3 is attached to the surface of the metal coating 2 by high-temperature evaporation of silicone oil or fluorine oil. The plasma layer 4 is formed by the ionization of gas under the action of an electric field. The plasma layer 4 interacts with the surface of the protective layer 3 to form stable chemical bonds, passivating the active sites on the surface of the protective layer 3, thereby reducing the activity of the surface of the protective layer 3 and improving its anti-oxidation and anti-corrosion performance. The protective layer 3 has different water droplet angles. The larger the water droplet angle, the better the hydrophobicity of the solid surface. The width of the low-resistivity part 6 in the metal coating 2 is smaller than the sum of the distance from the side of the high-resistivity part 5 away from the low-resistivity part 6 to the end and the distance between the two adjacent base films 1. This ensures that the low-resistivity part 6 is not in the electric field region, preventing the low-resistivity part 6 from breaking down. It also ensures that the electric field region is all high-resistivity part 5, improving self-healing and the film's withstand voltage.

[0020] Example 2: Refer to Figure 1 , Figure 2 A plasma layer 4 is provided on the side of the base film 1 away from the metal coating 2. The plasma layer 4 can also be a double-layer structure to increase the overall service life.

[0021] Example 3: Refer to Figure 4 The edge shape of the base film 1 can be either a single wavy edge or a double wavy edge. When the wavy edge is on the left side of the base film 1, it enhances the contact reliability between the gold spray layer and the core end face and increases the difficulty of moisture infiltrating from the interface between the gold spray layer and the core end face.

[0022] Example 4: Refer to Figure 5 When the wavy edge is on the right side of the base film 1, it can also enhance the contact reliability between the gold spray layer and the core end face, and increase the difficulty of moisture entering from the interface between the gold spray layer and the core end face.

[0023] Example 5: Refer to Figure 6 When the wavy edge is on the left and right sides of the base film 1, the effect of enhancing the contact reliability between the gold spray layer and the core end face is stronger, and the difficulty of moisture infiltrating from the interface between the gold spray layer and the core end face is increased.

[0024] Example 6: Refer to Figure 7 2. Metal plating layer and 5. High resistance part is a flat plate structure.

[0025] Example 7: Refer to Figure 8 The metal plating layer 2 and the high-resistivity part 5 have a gradient structure.

[0026] Example 8: Refer to Figure 9 The metal coating 2 and the high-resistivity part 5 have a two-step structure.

[0027] Example 9: Refer to Figure 10 The metal coating 2 and the high-resistivity part 5 are a gradient + flat plate structure.

[0028] Example 10: Refer to Figure 11 The metal coating 2 and the high-resistivity part 5 have a three-step structure.

[0029] Working principle: Under the protection of protective layer 3, the gas in plasma layer 4 is ionized under the action of electric field to form stable chemical bonds, passivating the active sites on the surface of protective layer 3, reducing the activity of the surface of protective layer 3, improving the anti-oxidation and anti-corrosion performance, and making protective layer 3 more hydrophobic. At the same time, through the width design of the low-resistance part 6 of metal plating layer 2, it is ensured that the low-resistance part 6 is not in the electric field area, improving self-healing and film pressure resistance. Combined with the wavy edge, it slows down the entry of water vapor into the interior, thereby improving the film's moisture resistance and pressure resistance, and thus improving the overall life of the product.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A corrugated edge moisture-proof metallized film, comprising a base film (1), characterized in that: A metal coating (2) is provided on one side of the base film (1), a protective layer (3) is provided on one side of the metal coating (2), a plasma layer (4) is provided on one side of the protective layer (3), a high-resistivity part (5) is provided on one side of the metal coating (2), and a low-resistivity part (6) is provided on one side of the metal coating (2).

2. The wavy-edged moisture-proof metallized film according to claim 1, characterized in that: The metal coating (2) is made of any one of zinc-aluminum, pure aluminum, aluminum-zinc-aluminum, copper-zinc-aluminum, or aluminum-magnesium.

3. The corrugated edge moisture-proof metallized film according to claim 1, characterized in that: One of the base films (1) has the plasma layer (4) disposed on the side away from the metal coating (2), while the other base film (1) does not have the plasma layer (4) disposed on the side away from the metal coating (2).

4. The wavy-edged moisture-proof metallized film according to claim 1, characterized in that: The water droplet angle θ on the surface of the protective layer (3) is 60° to 120°.

5. The corrugated edge moisture-proof metallized film according to claim 1, characterized in that: The protective layer (3) is made of either silicone oil or fluorinated oil.

6. The corrugated edge moisture-proof metallized film according to claim 1, characterized in that: The plasma layer (4) is any one of nitrogen, oxygen, argon, nitrogen-oxygen or argon-oxygen mixture.

7. The corrugated edge moisture-proof metallized film according to claim 1, characterized in that: The base film (1) has an edge shape that is either a single wavy edge or a double wavy edge.

8. The wavy-edged moisture-proof metallized film according to claim 1, characterized in that: The structure of the metal coating (2) is any one of flat plate, gradient, two-step, gradient + flat plate or three-step.

9. The corrugated edge moisture-proof metallized film according to claim 1, characterized in that: The width of the low-resistance portion (6) is a specific width.

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