Metallized capacitor film with improved oxidation resistance

Abstract

The utility model discloses a metalized capacitor film with improved oxidation resistance, which comprises a film base layer and a metal coating arranged on the film base layer, blank areas are symmetrically arranged on two side edges of the surface, close to the metal coating, of the film base layer, heat dissipation layers are arranged on the blank areas, and the heat dissipation layers are tightly attached to the side edges of the metal coating. A reinforcing layer is evaporated on the side, away from the metal coating, of the thin film base layer, an anti-oxidation layer is evaporated on the side, away from the thin film base layer, of the metal coating, the thickness of the reinforcing layer and the thickness of the anti-oxidation layer gradually change from the middle to the two sides in an arc mode, and the reinforcing layer and the anti-oxidation layer are parallel to each other. According to the utility model, the anti-oxidation layer covers the surface of the metal coating, so that the oxidation rate of the metal coating can be effectively reduced; the heat dissipation layer is arranged to accelerate the outward heat dissipation of the metal coating, so that the possibility of heating and even breakdown of the capacitor is effectively reduced; by arranging the reinforcing layer, the tensile strength of the whole film can be effectively improved, and then the possibility that the film cracks is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor films, in particular to a metallized capacitor film with improved anti-oxidation performance. Background Art

[0002] Capacitor film uses plastic film as dielectric, metal coating as electrode, and adopts non-inductive winding method to form capacitor element. The capacitor film on the current market is usually a composite structure of plastic film and metal coating.

[0003] However, the metal coating of the existing capacitor film oxidizes quickly in the air, and as the working time increases, its internal temperature rises rapidly, causing the stability of the capacitor to drop sharply, which can easily lead to the capacitor heating or even breakdown.

[0004] To this end, we propose a metallized capacitor film with improved anti-oxidation properties to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a metallized capacitor film with improved anti-oxidation performance to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A metallized capacitor film with improved anti-oxidation performance comprises a film base and a metal coating disposed on the film base, blank areas are symmetrically arranged on both sides of the surface of the film base close to the metal coating, a heat dissipation layer is arranged on the blank area, and the heat dissipation layer is closely attached to the side of the metal coating, a reinforcing layer is evaporated on the side of the film base away from the metal coating, and an anti-oxidation layer is evaporated on the side of the metal coating away from the film base, the thickness of the reinforcing layer and the anti-oxidation layer gradually changes in an arc shape from the middle to both sides, and the reinforcing layer and the anti-oxidation layer are parallel to each other.

[0008] Preferably, the heat dissipation layer includes a thermally conductive silicone layer and graphite heat sinks, and the graphite heat sinks are distributed at equal intervals along the extension direction of the thermally conductive silicone layer.

[0009] Furthermore, a heat conducting sheet is provided on one side of the graphite heat sink close to the metal coating, and the heat conducting sheet is in close contact with the surface of the metal coating.

[0010] Preferably, the reinforcing layer is made of one of polyester fiber felt, glass fiber felt and inorganic fiber felt.

[0011] Preferably, the anti-oxidation layer is made of polyimide.

[0012] In a further embodiment, the reinforcing layer is thin in the middle and thick on both sides, and the anti-oxidation layer is thick in the middle and thin on both sides.

[0013] In a further embodiment, the reinforcing layer is thick in the middle and thin at both sides, and the anti-oxidation layer is thin in the middle and thick at both sides.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model can effectively reduce the oxidation rate of the metal coating by arranging an anti-oxidation layer to cover the surface of the metal coating; can accelerate the heat dissipation of the metal coating to the outside by arranging a heat dissipation layer, thereby effectively reducing the possibility of heating or even breakdown of the capacitor; can effectively improve the tensile strength of the entire film by arranging a reinforcement layer, thereby reducing the possibility of cracks in the film; and can ensure that the thickness of the reinforcement layer and the anti-oxidation layer are gradually changed in an arc shape parallel to each other, thereby ensuring that the center of the film will not be offset when it is wound, thereby increasing the degree of tightness after winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the metal plating layer and the heat dissipation layer of the utility model;

[0018] Figure 3 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the front cross-sectional structure of the utility model.

[0020] In the figure: 1. Thin film base layer; 2. Metal coating; 3. Heat dissipation layer; 31. Thermal conductive silicone layer; 32. Graphite heat sink; 321. Thermal conductive sheet; 4. Reinforcement layer; 5. Anti-oxidation layer. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-2 , a metallized capacitor film with improved anti-oxidation performance, comprising a film base 1 and a metal coating 2 disposed on the film base 1, blank areas are symmetrically arranged on both sides of the surface of the film base 1 close to the metal coating 2, a heat dissipation layer 3 is arranged on the blank area, the heat dissipation layer 3 is consistent in thickness with the metal coating 2, the surfaces of the two sides away from the film base 1 are kept flush with each other, and the heat dissipation layer 3 is tightly fitted with the side of the metal coating 2 for conducting heat generated by the metal coating 2 outwardly, a reinforcing layer 4 is evaporated on the side of the film base 1 away from the metal coating 2 for enhancing the tensile strength of the film base 1, and an anti-oxidation layer 5 is evaporated on the side of the metal coating 2 away from the film base 1, the anti-oxidation layer 5 covers the surface of the metal coating 2 for reducing the erosion of the metal coating 2 by oxygen and moisture and improving the anti-oxidation ability of the metal coating 2, the thickness of the reinforcing layer 4 and the anti-oxidation layer 5 gradually changes from the middle to the two sides in an arc shape, and the reinforcing layer 4 and the anti-oxidation layer 5 are parallel to each other, so that the center of the entire film will not be offset when it is wound, and the tightness after winding is increased.

[0025] In order to ensure a better heat dissipation effect, a heat dissipation layer 3 is provided, including a thermally conductive silicone layer 31 and a graphite heat sink 32, and the graphite heat sink 32 is evenly spaced along the extension direction of the thermally conductive silicone layer 31. The thermally conductive silicone layer 31 and the graphite heat sink 32 accelerate the heat dissipation from the inside of the film to the outside, and a thermally conductive sheet 321 is provided on the side of the graphite heat sink 32 close to the metal coating 2, and the thermally conductive sheet 321 is tightly fitted to the surface of the metal coating 2. By increasing the contact area between the graphite heat sink 32 and the metal coating 2, the thermal conductivity efficiency can be improved and the heat dissipation can be accelerated.

[0026] Specifically, the reinforcing layer 4 is made of one of polyester fiber felt, glass fiber felt and inorganic fiber felt, which has high strength and toughness and can effectively enhance the overall performance of the film.

[0027] In order to ensure excellent anti-oxidation effect, the anti-oxidation layer 5 is made of polyimide. Polyimide is an organic polymer material with excellent thermal stability and mechanical properties, and is suitable for capacitors in high temperature environments.

[0028] Example 1, please refer to Figure 3 The reinforcing layer 4 is thin in the middle and thick on both sides, so that the reinforcing layer 4 bulges upward relative to the film base layer 1, enhancing the tensile strength of its two sides and making it less likely to produce cracks at its edges. The anti-oxidation layer 5 is thick in the middle and thin on both sides, so that the anti-oxidation layer 5 bulges upward relative to the metal plating layer 2, so that the reinforcing layer 4 of the inner film can fit tightly with the anti-oxidation layer 5 of the outer film during winding, reducing the deviation of the winding center and maintaining its tightness.

[0029] Example 2, please refer to Figure 4 The reinforcing layer 4 is thick in the middle and thin on both sides, so that the reinforcing layer 4 bulges downward relative to the film base layer 1, thereby enhancing the tensile strength of the middle part and making it less likely to break. The anti-oxidation layer 5 is thin in the middle and thick on both sides, so that the anti-oxidation layer 5 bulges downward relative to the metal plating layer 2, so that the reinforcing layer 4 of the inner film can fit tightly with the anti-oxidation layer 5 of the outer film during winding, thereby reducing the deviation of the winding center and maintaining its tightness.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A metallized capacitor film with improved anti-oxidation performance, comprising a film substrate (1) and a metal coating (2) disposed on the film substrate (1), characterized in that: The thin film base (1) has blank areas symmetrically arranged on both sides of the surface close to the metal coating (2), a heat dissipation layer (3) is arranged on the blank area, and the heat dissipation layer (3) is tightly fitted with the side of the metal coating (2), a reinforcing layer (4) is vapor-deposited on the side of the thin film base (1) away from the metal coating (2), and an anti-oxidation layer (5) is vapor-deposited on the side of the metal coating (2) away from the thin film base (1), the reinforcing layer (4) and the anti-oxidation layer (5) have arc-shaped thickness gradients from the middle to both sides, and the reinforcing layer (4) and the anti-oxidation layer (5) are parallel to each other.

2. The metallized capacitor film with improved oxidation resistance according to claim 1, characterized in that: The heat dissipation layer (3) comprises a heat-conducting silicone layer (31) and graphite heat sinks (32), and the graphite heat sinks (32) are distributed at equal intervals along the extension direction of the heat-conducting silicone layer (31).

3. The metallized capacitor film with improved oxidation resistance according to claim 2, characterized in that: A heat conducting sheet (321) is provided on one side of the graphite heat sink (32) close to the metal coating (2), and the heat conducting sheet (321) is tightly fitted to the surface of the metal coating (2).

4. The metallized capacitor film with improved oxidation resistance according to claim 1, characterized in that: The reinforcing layer (4) is made of a material selected from the group consisting of polyester fiber felt, glass fiber felt, and inorganic fiber felt.

5. The metallized capacitor film with improved oxidation resistance according to claim 1, characterized in that: The anti-oxidation layer (5) is made of polyimide.

6. The metallized capacitor film with improved oxidation resistance according to claim 1, characterized in that: The reinforcing layer (4) is thin in the middle and thick on both sides, and the anti-oxidation layer (5) is thick in the middle and thin on both sides.

7. The metallized capacitor film with improved oxidation resistance according to claim 1, characterized in that: The reinforcing layer (4) is thick in the middle and thin at both sides, and the anti-oxidation layer (5) is thin in the middle and thick at both sides.

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