Metallized film capacitor

Abstract

The utility model relates to a metalized film capacitor in the technical field of capacitors, which comprises an electrode core, the electrode core is composed of a first metal foil, a first insulating layer, a metalized film, a second metal foil and a second insulating layer, one end of the first insulating layer extends outwards to form a reserved glue joint section, the reserved glue joint section is folded towards the bottom end face of the second insulating layer, and the metalized film is arranged on the metalized film. The first insulating layer is connected with the second insulating layer through the reserved glue joint section, and the first metal foil, the first insulating layer, the metallized film, the second metal foil and the second insulating layer are wound through one end close to the reserved glue joint section to form a columnar structure, so that the capacitor is broken down through the metallized film and is self-healed under the condition of overvoltage, and the service life of the capacitor is prolonged. And meanwhile, the minimum working capacitance of the capacitor can be ensured through the metal foil with good ductility, so that the metallized film capacitor can still keep effective working capacitance through the metal foil after multiple times of self-healing.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and in particular to a metallized film capacitor. Background Technology

[0002] A capacitor consists of two conductors placed close together, with a non-conductive insulating dielectric layer in between. When a voltage is applied between the two plates of a capacitor, it stores electrical charge. The capacitance of a capacitor is numerically equal to the ratio of the charge on one of the conducting plates to the voltage between the two plates.

[0003] The existing Chinese utility model patent with publication number CN204045399U discloses a metallized film capacitor, including a first metallized film and a second metallized film. Both the first and second metallized films are rectangular, and the first and second metallized films are staggered and overlapped. It has advantages such as the vapor-deposited metal being resistant to damage, strong self-healing ability, and fast charging and discharging.

[0004] While existing metallized film capacitors utilize self-healing metallized films as their raw material, possessing a certain degree of self-healing capability and fast charging and discharging characteristics, their capacitance decreases after repeated self-healing, failing to meet the requirements for voltage regulation and filtering in circuits. Therefore, there is an urgent need to develop a metallized film capacitor to meet the needs of practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a metallized film capacitor to solve the defect that the capacitance of existing metallized film capacitors decreases after multiple self-healing cycles, thus failing to meet the requirements of circuit voltage regulation and filtering.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A metallized film capacitor includes an electrode core, which is composed of a first metal foil, a first insulating layer, a metallized film, a second metal foil, and a second insulating layer. The first metal foil, the first insulating layer, the metallized film, the second metal foil, and the second insulating layer are stacked sequentially. One end of the first insulating layer extends outward as a reserved adhesive section. The reserved adhesive section is folded towards the bottom surface of the second insulating layer. The first insulating layer is connected to the second insulating layer through the reserved adhesive section. The first metal foil, the first insulating layer, the metallized film, the second metal foil, and the second insulating layer are wound together near the reserved adhesive section to form a columnar structure.

[0008] In the above description, as a further embodiment, the metallization film includes a first metallization film and a second metallization film. Both the first metallization film and the second metallization film are composed of a vapor-deposited electrode and a metallization thin film, and the first metallization film and the second metallization film are stacked one on top of the other.

[0009] In the above description, as a further embodiment, the vapor deposition electrode has a blank area on one side of the metallized film, and the first metallized film and the second metallized film have a symmetrical structure on the horizontal plane. The side of the first metallized film away from the blank area is electrically connected to the same side of the second metal foil, and the side of the second metallized film away from the blank area is electrically connected to the same side of the first metal foil.

[0010] In the above description, as a further embodiment, the first metal foil and the second metallization film form the first conductive region, and the second metal foil and the first metallization film form the second conductive region, with the first conductive region and the second conductive region having an interleaved structure.

[0011] As a further embodiment of the above description, a gold-plated particle layer is also included. The gold-plated particle layer is disposed on both sides of the columnar electrode core, and the first metal foil and the second metallization film are both electrically connected through the gold-plated particle layer.

[0012] As a further embodiment of the above description, the columnar electrode core is provided with metal pins on both sides. One end of the metal pin is welded to the center of the gold-plated particle layer, and the other end of the metal pin extends to the outside of the columnar electrode core.

[0013] As a further embodiment of the above description, the surface of the columnar electrode core is further provided with an outer plastic wrapping layer, and the end of the metal pin away from the electrode core is exposed to the outside.

[0014] Compared with the prior art, the beneficial effects of this utility model are: by adopting a combination structure of interleaved stacking of metal foil and metallized film, the capacitor can break down through the metallized film and self-heal under overvoltage conditions. At the same time, the minimum working capacitance of the capacitor can be guaranteed by the metal foil with good ductility, so that the metallized film capacitor can still maintain an effective working capacitance through the metal foil after multiple self-healing. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a metallized film capacitor described in this embodiment;

[0016] Figure 2 This is an exploded view of the structure of a metallized film capacitor described in this embodiment;

[0017] Figure 3This is a cross-sectional view of the metallized film capacitor described in this embodiment along the winding direction.

[0018] Figure 4 This is a cross-sectional view of the metallized film capacitor described in this embodiment.

[0019] In the figure: 1-first insulating layer, 11-reserved adhesive section, 2-first metal foil, 3-first metallization film, 31-evaporated electrode, 32-metallization film, 4-second metallization film, 5-second metal foil, 6-second insulating layer, 7-gold sputtering particle layer, 8-metal lead, 9-outer plastic wrapping layer, 10-electrode core. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] For this embodiment, please refer to Figures 1-4 The specific implementation of a metallized film capacitor includes an electrode core 10, which is composed of a first metal foil 2, a first insulating layer 1, a metallized film, a second metal foil 5, and a second insulating layer 6. The first metal foil 2, the first insulating layer 1, the metallized film, the second metal foil 5, and the second insulating layer 6 are stacked in sequence, and one end of the first insulating layer 1 extends outward to form a reserved adhesive section 11. The reserved adhesive section 11 is folded towards the bottom end of the second insulating layer 6, and the first insulating layer 1 is connected to the second insulating layer 6 through the reserved adhesive section 11. The first metal foil 2, the first insulating layer 1, the metallized film, the second metal foil 5, and the second insulating layer 6 are wound into a columnar structure near the reserved adhesive section 11. Metal leads 8 are also provided on both sides of the columnar electrode core 10, and an outer plastic wrapping layer 9 is provided on the surface of the columnar electrode core 10. The end of the metal lead 8 away from the electrode core 10 is exposed to the outside.

[0022] By employing a combination structure of interleaved stacked metal foil and metallized film, the capacitor can self-heal after breakdown through the metallized film under overvoltage conditions. At the same time, the minimum working capacitance of the capacitor can be guaranteed by the metal foil with good ductility, so that the metallized film capacitor can still maintain an effective working capacitance through the metal foil after multiple self-healing.

[0023] like Figure 3 As shown, the metallization film includes a first metallization film 3 and a second metallization film 4. Both the first metallization film 3 and the second metallization film 4 are composed of a vapor-deposited electrode 31 and a metallization film 32. The first metallization film 3 and the second metallization film 4 are stacked one on top of the other.

[0024] The vapor deposition electrode 31 has a blank area on one side of the metallization film 32, and the first metallization film 3 and the second metallization film 4 are symmetrical in the horizontal plane. The side of the first metallization film 3 away from the blank area is electrically connected to the same side of the second metal foil 5, and the side of the second metallization film 4 away from the blank area is electrically connected to the same side of the first metal foil 2.

[0025] Preferably, it also includes a gold-sprayed particle layer 7, which is disposed on both sides of the columnar electrode core 10. The first metal foil 2 and the second metallization film 4 are connected to each other and the second metal foil 5 and the first metallization film 3 through the gold-sprayed particle layer 7.

[0026] The first metal foil 2 and the second metallized film 4 form the first conductive region, and the second metal foil 5 and the first metallized film 3 form the second conductive region. The first and second conductive regions are interleaved. One end of the metal pin 8 is soldered to the center of the gold-plated particle layer 7, and the other end of the metal pin 8 extends to the outside of the columnar electrode core 10. The metal pin 8 near the first conductive region is connected to the positive terminal of the power supply, and the metal pin 8 near the second conductive region is connected to the negative terminal of the power supply. This allows the first conductive region to acquire positive charge and the second conductive region to acquire negative charge. The interleaved structure between the first and second conductive regions allows for faster charging and discharging speeds through the interleaved induced magnetic field.

[0027] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A metallized film capacitor, comprising an electrode core, the electrode core being composed of a first metal foil, a first insulating layer, a metallized film, a second metal foil, and a second insulating layer, characterized in that: The first metal foil, the first insulating layer, the metallized film, the second metal foil, and the second insulating layer are stacked in sequence. One end of the first insulating layer extends outward as a reserved adhesive section. The reserved adhesive section is folded towards the bottom surface of the second insulating layer. The first insulating layer is connected to the second insulating layer through the reserved adhesive section. The first metal foil, the first insulating layer, the metallized film, the second metal foil, and the second insulating layer are wound together near the reserved adhesive section to form a columnar structure.

2. The metallized film capacitor according to claim 1, characterized in that: The metallization film includes a first metallization film and a second metallization film. Both the first metallization film and the second metallization film are composed of vapor-deposited electrodes and metallization films. The first metallization film and the second metallization film are stacked one on top of the other.

3. A metallized film capacitor according to claim 2, characterized in that: The vapor deposition electrode has a blank area on one side of the metallized film, and the first metallized film and the second metallized film are symmetrical in the horizontal plane. The side of the first metallized film away from the blank area is electrically connected to the same side of the second metal foil, and the side of the second metallized film away from the blank area is electrically connected to the same side of the first metal foil.

4. A metallized film capacitor according to claim 3, characterized in that: The first metal foil and the second metallization film form a first conductive region, and the second metal foil and the first metallization film form a second conductive region. The first conductive region and the second conductive region have an interleaved structure.

5. A metallized film capacitor according to claim 3, characterized in that: It also includes a gold-plated particle layer, which is disposed on both sides of the columnar electrode core. The first metal foil and the second metallization film are connected through the gold-plated particle layer.

6. A metallized film capacitor according to claim 5, characterized in that: The columnar electrode core is also provided with metal pins on both sides. One end of the metal pin is welded to the center of the gold-plated particle layer, and the other end of the metal pin extends to the outside of the columnar electrode core.

7. A metallized film capacitor according to claim 6, characterized in that: The surface of the columnar electrode core is also provided with an outer plastic wrapping layer, and the end of the metal pin away from the electrode core is exposed to the outside.

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