A novel laminated wound film capacitor

Abstract

The application relates to the technical field of capacitors, in particular to a novel laminated winding thin-film capacitor which comprises a shell and a core, the core is installed in the interior of the shell, the bottom of the core is provided with a sealing plug, the core is located at the top of the sealing plug, the top of the shell is provided with anti-explosion patterns, the core is provided with two groups of insulating medium layers, and the two groups of insulating medium layers are both provided with a second metal plating layer and a first metal plating layer. The novel laminated winding thin-film capacitor increases the effective area of the metal plating layer and the insulating medium layer in the capacitor through a winding structure, realizes a larger capacitance value under the same volume, helps to meet the demand of electronic equipment for high-capacitance-value capacitors, improves the integration and portability of the equipment, enables the capacitor to quickly self-heal when local breakdown occurs through the winding structure, avoids the problem that the whole capacitor is disabled due to local failure, and improves the reliability and stability of the capacitor.

Description

Technical Field

[0001] This application relates to the field of capacitor technology, and in particular to a novel stacked wound film capacitor. Background Technology

[0002] Film capacitors are capacitors constructed by overlapping metal foil as electrodes with plastic films such as polyethylene terephthalate (PET), polypropylene (PP), polystyrene (PS), or polycarbonate (PC) films at both ends and then winding them into a cylindrical shape. Depending on the type of plastic film, they are called polyethylene terephthalate capacitors (also known as Mylar capacitors), polypropylene capacitors (also known as PP capacitors), polystyrene capacitors (also known as PS capacitors), and polycarbonate capacitors.

[0003] A search revealed Chinese Patent Publication No. CN207458772U, which discloses a novel stacked wound film capacitor. The capacitor includes an external device and an internal core device. The external device houses the internal core device, and a shell is mounted on the external device. A filling resin is placed inside the shell, and the filling resin is fixedly connected to the external device via the shell. A lead wire is located below the filling resin and is also fixedly connected to the shell via the filling resin. The internal core device has a first electrode metal foil, and a second electrode metal foil is located on the side of the first electrode metal foil. Both the second and first electrode metal foils are rotatably connected to the internal core device. This device, by incorporating a disc-like design with transverse gaps, provides insulation and enhances durability. The dielectric film encapsulating the metal layer facilitates electrical transmission while increasing protection, and the capacitor is easy to wind. The structure is simple and easy to implement.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: Traditional laminated capacitors have some performance limitations in use. Their relatively large size is a major limiting factor in the application of modern electronic devices, which increasingly pursue miniaturization and compactness. Furthermore, laminated capacitors have poor self-healing capabilities; once an internal fault occurs, it is difficult for them to repair themselves, resulting in a relatively short lifespan and reliability that is insufficient for demanding circuit applications. Utility Model Content

[0005] To address the problems mentioned in the background section, this application provides a novel stacked wound film capacitor.

[0006] This application provides a novel stacked wound film capacitor, which adopts the following technical solution: it includes a shell and a core, the core is installed inside the shell, a sealing plug is provided at the bottom of the core, the core is located at the top of the sealing plug, the top of the shell is provided with explosion-proof texture, two sets of insulating dielectric layers are provided on the core, a second metal plating layer and a first metal plating layer are provided on one side of each of the two sets of insulating dielectric layers, aluminum rods are fixedly installed on the surface of the first metal plating layer and the second metal plating layer, and positive and negative leads extending out of the shell are fixedly installed at the bottom of the aluminum rods.

[0007] Optionally, a filling resin is filled between the outer shell and the core, and a gap plate is provided on the inner wall of the outer shell at the top of the core.

[0008] Optionally, the outer shell is provided with an inwardly recessed groove, and the sealing plug is provided with a limiting groove corresponding to the inwardly recessed groove.

[0009] Optionally, the second metal plating layer and the first metal plating layer are both located on the same side of the insulating dielectric layer, and the insulating dielectric layer is impregnated with electrolyte.

[0010] Optionally, the insulating dielectric layer, the first metal plating layer, and the second metal plating layer are all rotatably connected to the core, and the insulating dielectric layer, the first metal plating layer, and the second metal plating layer are integrated into one piece, and a thin-film capacitor is manufactured by winding.

[0011] Optionally, the insulating dielectric layer is made of polypropylene film material, and the first metal coating and the second metal coating are attached to the insulating dielectric layer by vacuum evaporation to form a patterned structure.

[0012] Optionally, the aluminum rod is fixedly installed with the second metal plating layer and the first metal plating layer by a nail splicing buckle, and both the negative electrode pin and the positive electrode pin pass through the sealing plug and are sealed.

[0013] In summary, this application includes the following beneficial technical effects: This invention increases the effective area of ​​the metal plating layer and insulating dielectric layer inside the capacitor through a winding structure, achieving a larger capacitance value in the same volume. This helps meet the demand of electronic devices for high-capacitance capacitors, while also reducing the size and weight of the capacitor and improving the integration and portability of the device.

[0014] This invention enables the capacitor to quickly self-heal when a local breakdown occurs through a winding structure, avoiding the problem of the entire capacitor failing due to a local fault, which is common in traditional capacitors. This greatly improves the reliability and stability of the capacitor, extends its service life, and reduces maintenance costs and equipment failure risks. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the front in an embodiment of this application; Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the outer shell in an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the housing and core assembly in an embodiment of this application; Figure 4 This is a three-dimensional structural diagram of the insulating dielectric layer, the first metal plating layer, and the second metal plating layer in the embodiments of this application.

[0016] Reference numerals: 1. Outer shell; 101. Explosion-proof groove; 102. Inner groove; 103. Sealing plug; 104. Core; 105. Filling resin; 106. Gap plate; 107. Limiting groove; 2. Insulating dielectric layer; 201. First metal plating layer; 202. Second metal plating layer; 203. Aluminum rod; 204. Negative electrode pin; 205. Positive electrode pin; 206. Nail splicing buckle. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 - Figure 4 This application will be described in further detail.

[0018] This application discloses a novel stacked wound thin-film capacitor. For example... Figure 1 and Figure 3 As shown, the device includes a housing 1 and a core 104. The core 104 is installed inside the housing 1. A sealing plug 103 is provided at the bottom of the core 104, and the core 104 is located on top of the sealing plug 103. An explosion-proof pattern 101 is provided on the top of the housing 1. Two sets of insulating dielectric layers 2 are provided on the core 104. A second metal plating layer 202 and a first metal plating layer 201 are provided on one side of each of the two sets of insulating dielectric layers 2. An aluminum rod 203 is fixedly installed on the surface of both the first metal plating layer 201 and the second metal plating layer 202. The bottom is fixedly mounted with a positive terminal 205 and a negative terminal 204 extending out of the outer shell 1. A first metal plating layer 201 and a second metal plating layer 202 are laid on both sides of the insulating dielectric layer 2. When a voltage is applied to the negative terminal 204 and the positive terminal 205 of the capacitor, positive charges will concentrate on one of the second metal plating layers 202, and negative charges will concentrate on the other first metal plating layer 201, thereby forming an electric field between the first metal plating layer 201 and the second metal plating layer 202, realizing the storage of electrical energy.

[0019] Please see Figure 2 and Figure 3The space between the outer shell 1 and the core 104 is filled with filling resin 105. A gap plate 106 is provided on the inner wall of the outer shell 1 at the top of the core 104. The outer shell 1 is provided with an inwardly recessed groove 102. The sealing plug 103 is provided with a limiting groove 107 corresponding to the groove 102. Through the mutual cooperation between the groove 102 and the limiting groove 107, the sealing plug 103 can be better limited to the inner side of the outer shell 1 during installation, and can be more conveniently limited during use.

[0020] Please see Figure 3 and Figure 4 The second metal plating layer 202 and the first metal plating layer 201 are both located on the same side of the insulating dielectric layer 2. The insulating dielectric layer 2 is impregnated with electrolyte. The insulating dielectric layer 2, the first metal plating layer 201 and the second metal plating layer 202 are all rotatably connected to the core 104. The insulating dielectric layer 2, the first metal plating layer 201 and the second metal plating layer 202 are integrated into one piece and made into a film capacitor by winding. The winding method makes the first metal plating layer 201 and the second metal plating layer 202 and the insulating dielectric layer 2 inside the capacitor tightly attached, increasing the surface area of ​​the capacitor. This helps to improve the capacitance of the capacitor. At the same time, the winding structure also makes the electric field distribution inside the capacitor more uniform and reasonable.

[0021] Please see Figure 4 The insulating dielectric layer 2 is made of polypropylene film material. The first metal plating layer 201 and the second metal plating layer 202 are attached to the insulating dielectric layer 2 by vacuum evaporation to form a patterned structure. The aluminum rod 203 is fixedly installed with the second metal plating layer 202 and the first metal plating layer 201 by nail splicing buckle 206. The negative electrode lead 204 and the positive electrode lead 205 are both sealed through the sealing plug 103. The winding structure also makes the electric field distribution inside the capacitor more uniform and reasonable, reducing the non-uniformity of the electric field, thereby improving the voltage withstand capability and electrical performance stability of the capacitor. When the capacitor is working, if a breakdown fault occurs at a certain point of the first metal plating layer 201 and the second metal plating layer 202, the metal at that point will melt rapidly to form a tiny open circuit point, thereby isolating the fault area and preventing the fault from expanding.

[0022] The implementation principle of a novel stacked wound film capacitor according to an embodiment of this application is as follows: A first metal plating layer 201 and a second metal plating layer 202 are deposited on both sides of the insulating dielectric layer 2. When voltage is applied to the negative terminal 204 and the positive terminal 205 of the capacitor, positive charges concentrate on one of the second metal plating layers 202, and negative charges concentrate on the other first metal plating layer 201. This creates an electric field between the first metal plating layer 201 and the second metal plating layer 202, thus storing electrical energy. The insulating dielectric layer 2 acts as a charge isolation layer, and its dielectric properties directly affect the capacitance and insulation performance of the capacitor. The film capacitor is manufactured using a winding method, enabling… The first metal plating layer 201, the second metal plating layer 202, and the insulating dielectric layer 2 inside the capacitor are closely bonded together, increasing the surface area of ​​the capacitor. This helps to improve the capacitance of the capacitor. At the same time, the winding structure also makes the electric field distribution inside the capacitor more uniform and reasonable, reducing the non-uniformity of the electric field, thereby improving the capacitor's voltage withstand capability and electrical performance stability. When the capacitor is working, if a breakdown fault occurs at a certain point between the first metal plating layer 201 and the second metal plating layer 202, the metal at that point will melt rapidly, forming a tiny open circuit point, thereby isolating the fault area, preventing the fault from spreading, and allowing the capacitor to continue to work normally, thus improving the reliability and service life of the capacitor.

[0023] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel stacked wound film capacitor, comprising a shell (1) and a core (104), characterized in that: The core (104) is installed inside the outer shell (1). A sealing plug (103) is provided at the bottom of the core (104). The core (104) is located at the top of the sealing plug (103). An explosion-proof texture (101) is provided at the top of the outer shell (1). Two sets of insulating dielectric layers (2) are provided on the core (104). A second metal plating layer (202) and a first metal plating layer (201) are provided on one side of each of the two sets of insulating dielectric layers (2). An aluminum rod (203) is fixedly installed on the surface of the first metal plating layer (201) and the second metal plating layer (202). A positive electrode pin (205) and a negative electrode pin (204) extending out of the outer shell (1) are fixedly installed at the bottom of the aluminum rod (203).

2. The novel stacked wound film capacitor according to claim 1, characterized in that: The space between the outer shell (1) and the core (104) is filled with filling resin (105), and a gap plate (106) is provided on the inner wall of the outer shell (1) at the top of the core (104).

3. A novel stacked wound film capacitor according to claim 1, characterized in that: The outer shell (1) is provided with an inwardly recessed groove (102), and the sealing plug (103) is provided with a limiting groove (107) corresponding to the inwardly recessed groove (102).

4. A novel stacked wound film capacitor according to claim 1, characterized in that: The second metal plating layer (202) and the first metal plating layer (201) are both located on the same side of the insulating dielectric layer (2), and the insulating dielectric layer (2) is impregnated with electrolyte.

5. A novel stacked wound film capacitor according to claim 1, characterized in that: The insulating dielectric layer (2), the first metal plating layer (201) and the second metal plating layer (202) are all rotatably connected to the core (104). The insulating dielectric layer (2), the first metal plating layer (201) and the second metal plating layer (202) are integrated into one unit and are made into a thin film capacitor by winding.

6. A novel stacked wound film capacitor according to claim 1, characterized in that: The insulating dielectric layer (2) is made of polypropylene film material. The first metal coating (201) and the second metal coating (202) are attached to the insulating dielectric layer (2) by vacuum evaporation to form a patterned structure.

7. A novel stacked wound film capacitor according to claim 1, characterized in that: The aluminum rod (203) is fixedly installed with the second metal plating layer (202) and the first metal plating layer (201) by a nail splicing buckle (206), and the negative electrode pin (204) and the positive electrode pin (205) both pass through the sealing plug (103) and are sealed.

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