CN213845034U

CN213845034U - High-temperature-resistant polypropylene film capacitor

Info

Publication number: CN213845034U
Application number: CN202023112029.9U
Authority: CN
Inventors: 曹向阳; 唐信元
Original assignee: Chengdu Duoji Electronics Co ltd
Current assignee: Chengdu Duoji Electronics Co ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-07-30
Anticipated expiration: 2030-12-22

Abstract

The utility model relates to a high temperature resistant polypropylene film capacitor, including the base film that uses the polypropylene film to make, shell subassembly, insulating closing plate and pin, be provided with metal coating on the base film, base film both sides limit is provided with blank and remains the limit, the base film noninductive coiling forms cylindric core, the pin with the welding of core tip, shell subassembly includes inner shell and shell, the core is installed in the inner shell, the inner shell tip with insulating closing plate connects, the pin runs through insulating closing plate, the shell cover is established outside the inner shell, the inner shell with it has phase change material to fill between the shell. The utility model discloses utilize the phase change material in inner shell and the shell intermediate layer to absorb the heat that the core during operation produced, and then improve the holistic high temperature resistance performance of condenser for the condenser is applicable to the precision equipment that the required precision is high, temperature coefficient is little.

Description

High-temperature-resistant polypropylene film capacitor

Technical Field

The utility model relates to a condenser technical field especially relates to a high temperature resistant polypropylene film capacitor.

Background

The thin film capacitor is a basic electronic component in a circuit, and is widely applied to the fields of medical equipment, automobile electronics, automatic control equipment and the like due to good temperature characteristics, frequency characteristics and low resistance characteristics. The metallized polypropylene film capacitor is suitable for making products into various shapes by the characteristics of high breakdown field intensity, low dielectric loss, low power consumption and the like, and meets the installation requirement. The existing polypropylene film capacitor has the defects of single film structure, limited charge stored in unit area, low capacity, poor high temperature resistance and relatively high heat shrinkage rate, thus causing poor stability of the polypropylene film capacitor.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a high temperature resistant polypropylene film capacitor against the poor stability of the existing polypropylene film capacitor.

The utility model provides a high temperature resistant polypropylene film capacitor, includes the base film that uses the polypropylene film to make, shell subassembly, insulating sealing plate and pin, be provided with the metal coating on the base film, base film both sides limit is provided with blank margin, the base film noninductive coiling forms cylindric core, the pin with core tip welding, the shell subassembly includes inner shell and shell, the core is installed in the inner shell, inner shell tip with insulating sealing plate connects, the pin runs through insulating sealing plate, the shell cover is established outside the inner shell, the inner shell with it has phase change material to fill between the shell.

Preferably, the edge of the metal plating layer is provided with a sawtooth edge.

Preferably, a plurality of bulges are arranged on the outer side wall of the inner shell, and the bulges are hemispherical.

Preferably, the metal plating layer includes an aluminum plating layer and a copper plating layer, and the aluminum plating layer is disposed between the base film and the copper plating layer.

Preferably, the blank margin is provided with a convex thickened part.

The utility model discloses an useful part lies in: 1. the phase-change material in the interlayer of the inner shell and the outer shell is used for absorbing heat generated during the operation of the core, so that the integral high-temperature resistance of the capacitor is improved, and the capacitor is suitable for precision equipment with high precision requirement and small temperature coefficient; 2. set up jagged edge at the metallic coating limit portion of plating of base film, can effectively gather the heat at metallic coating limit portion according to sharp-end heat effect, and then go out the heat transfer, the whole calorific capacity of condenser is little, long service life.

Drawings

FIG. 1 is a schematic perspective view of a high temperature polypropylene film capacitor according to an embodiment;

FIG. 2 is an exploded view of a high temperature resistant polypropylene film capacitor;

FIG. 3 is a schematic top view of a base film;

fig. 4 is a schematic sectional view taken along the line a-a in fig. 3.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 4, a high temperature resistant polypropylene film capacitor includes a base film 1 made of polypropylene film, a shell assembly 2, an insulating sealing plate 3 and pins 4, the base film 1 is provided with a metal plating layer 11, two side edges of the base film 1 are provided with blank margins 12, the base film 1 is wound noninductively to form a cylindrical core, the pins 4 are welded to end portions of the core, the shell assembly 2 includes an inner shell 21 and an outer shell 22, the core is installed in the inner shell 21, an end portion of the inner shell 21 is connected to the insulating sealing plate 3, the pins 4 penetrate through the insulating sealing plate 3, the outer shell 22 is sleeved outside the inner shell 21, and a phase change material 5 is filled between the inner shell 21 and the outer shell 22. Specifically, in the present embodiment, the base film 1 made of polypropylene has a wide capacity range, which can range from thousands of picofarads to tens of microfarads, and has good temperature resistance, high insulation resistance, and good self-healing performance. The base film 1 is plated with a metal plating layer 11, and blank margins 12 are arranged at two sides of the base film 1, so that a certain width is reserved when the base film 1 is wound. Further, in order to improve the heat dissipation performance of the case assembly 2, the case assembly 2 is divided into an inner case 21 and an outer case 22, and a phase change material 5 is filled between the inner case 21 and the outer case 22, and after a core installed in the inner case 21 operates for a certain period of time, the core dissipates heat through the inner case 21 made of metal, and absorbs heat through the phase change material 5. After the phase-change material 5 absorbs certain heat, the phase-change material melts, the surface temperature of the core is quickly reduced, the core is prevented from expanding due to high temperature, and the integral high-temperature resistance of the capacitor is improved. Further, an insulating sealing plate 3 is used as a sealing plate for sealing the inner casing 21, so that the sealing performance of the inner casing 21 reaches the IP68 level.

As shown in fig. 3 to 4, a serrated edge 111 is provided on the side of the metal plating layer 11. Specifically, according to the tip heat effect, when the capacitor works, the heat in the middle of the metal coating 11 can be rapidly dissipated to two sides of the capacitor, so that a large amount of heat cannot be accumulated in the core, the edge of the metal coating 11 is a sawtooth edge 111, the bonding force with the edge of the base film 1 is strong, and the edge cannot be curled when being heated.

As shown in fig. 2, a plurality of protrusions 211 are disposed on the outer side wall of the inner casing 21, and the protrusions 211 are hemispherical. Specifically, the protrusions 211 arranged on the side wall of the inner shell 21 can effectively increase the contact area between the inner shell 21 and the phase change material 5, and increase the heat conduction efficiency between the inner shell 21 and the phase change material 5.

As shown in fig. 4, the metal plating layer 11 includes an aluminum plating layer 111 and a copper plating layer 112, and the aluminum plating layer 111 is disposed between the base film 1 and the copper plating layer 112. Specifically, the aluminum plating layer 111 and the copper plating layer 112 are stacked to form the metal plating layer 11, the copper plating layer 112 is good in conductivity, the copper plating layer 112 is convenient to use for welding with the pins 4, the aluminum plating layer 111 is sprayed on the base film 1, the copper plating layer 112 is convenient to spray subsequently, and the abrasion loss of the base film 1 is reduced.

As shown in fig. 3 to 4, the blank margin 12 is provided with a raised thickened portion 121. Specifically, the blank margin 12 is provided with a raised thickened portion 121 for improving the hardness of the blank margin 12 and preventing the blank margin 12 from being damaged by pressure when the core formed by winding the base film 1 is subjected to hot pressing.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A high temperature resistant polypropylene film capacitor is characterized in that: the base film is provided with a metal coating, two sides of the base film are provided with blank edges, the base film is wound noninductively to form a cylindrical core, the pins are welded with the end portions of the core, the shell assembly comprises an inner shell and an outer shell, the core is installed in the inner shell, the end portions of the inner shell are connected with the insulating sealing plate, the pins penetrate through the insulating sealing plate, the outer shell is sleeved outside the inner shell, and phase change materials are filled between the inner shell and the outer shell.

2. A high temperature resistant polypropylene film capacitor according to claim 1 wherein: and the edge part of the metal coating is provided with a sawtooth edge.

3. A high temperature resistant polypropylene film capacitor according to claim 2 wherein: the outer side wall of the inner shell is provided with a plurality of bulges, and the bulges are hemispherical.

4. A high temperature resistant polypropylene film capacitor according to claim 3 wherein: the metal coating comprises an aluminum coating and a copper coating, and the aluminum coating is arranged between the base film and the copper coating.

5. The high temperature resistant polypropylene film capacitor of claim 4 wherein: and the blank margin is provided with a raised thickened part.