Thin film capacitor

Abstract

The utility model provides a thin-film capacitor. The thin-film capacitor comprises a core group, an insulating core rod, an inner-layer copper strip and an outer-layer copper strip, the core group is provided with a plurality of cores; the insulating core rod is arranged at the winding axis of the core; the inner-layer copper strip and the outer-layer copper strip are respectively provided with a first positioning hole and a first connecting part, the insulating core rod can be sleeved into the first positioning hole so as to position the inner-layer copper strip, and the first connecting part is suitable for being connected with an electrode surface of the core; the outer-layer copper strip is provided with a second positioning hole and a second connecting part, the insulating core rod can be sleeved with the second positioning hole so that the outer-layer copper strip can be overlapped on the inner-layer copper strip, the second connecting part is suitable for being connected with the first connecting part, and when the outer-layer copper strip is overlapped with the inner-layer copper strip, the second connecting part is suitable for being connected with the insulating core rod. The outer-layer copper strip can completely or partially cover the upper surface of the inner-layer copper strip. The thin film capacitor can ensure the overcurrent capability and reduce the manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to a film capacitor. Background Art

[0002] With the rapid development of power electronics technology, metallized film capacitors are increasingly used in the field of new energy, and are widely used in rail transit, power grid, wind power, solar energy and other fields.

[0003] DC bus filter capacitors are mainly used for filtering and absorbing spikes, so their characteristics must be large capacity, high voltage impact resistance, and high ripple current resistance. High ripple current resistance requires the internal overcurrent area to be as large as possible. Generally, an integrated busbar is designed to increase the overcurrent capacity by increasing the overall busbar thickness and increasing the overcurrent cross-sectional area. However, increasing the thickness of the busbar as a whole will lead to unnecessary waste and high cost. Therefore, it is necessary to propose a film capacitor. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the utility model is to provide a film capacitor that can flexibly overlap copper strips at locations where the cross-sectional area needs to be increased, ensure overcurrent capability, and facilitate cost control.

[0005] In order to achieve the above object, the utility model proposes a film capacitor, which comprises: a core group, an insulating core rod, an inner copper strip and an outer copper strip;

[0006] The core group has a plurality of cores;

[0007] The insulating core rod is arranged at the winding axis of the core;

[0008] The inner copper belt and the outer copper belt have a first positioning hole and a first connecting portion, the first positioning hole can be inserted into the insulating core rod to position the inner copper belt, and the first connecting portion is suitable for connecting the electrode surface of the core;

[0009] The outer copper strip has a second positioning hole and a second connecting portion. The second positioning hole can be inserted into the insulating core rod so that the outer copper strip overlaps the inner copper strip. The second connecting portion is suitable for connecting the first connecting portion. When the outer copper strip overlaps the inner copper strip, the outer copper strip can fully or partially cover the upper surface of the inner copper strip.

[0010] According to a film capacitor proposed by the utility model, the inner copper strip and the outer copper strip are positioned by an insulating core rod, which makes it convenient for the inner copper strip to connect to the electrode surface of the core and for the outer copper strip to overlap on the inner copper strip. Thus, the cross-sectional area of ​​the confluence is increased by overlapping the outer copper strips, thereby improving the current carrying capacity of the confluence, which is beneficial to cost control.

[0011] In addition, a film capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0012] Optionally, the insulating core rod is cylindrical, and the first positioning hole and the second positioning hole are circular holes.

[0013] Optionally, the first connecting parts are arranged on two opposite sides of the inner copper strip in the length direction, and an electrode surface of the core is connected to two of the first connecting parts.

[0014] Optionally, the first connecting portion and the second connecting portion each have two first notches, and the two first notches are arranged at intervals.

[0015] Furthermore, a second gap is provided between the two first gaps.

[0016] Optionally, the inner copper belt is provided with a first bending portion, and the outer copper belt is provided with a second bending portion, and when the outer copper belt overlaps with the inner copper belt, the first bending portion overlaps with the second bending portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a film capacitor in a partially covered state with an outer copper tape according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A magnified view of point A;

[0019] Figure 3 This is a schematic structural diagram of a film capacitor in a fully covered state with an outer copper strip according to an embodiment of the utility model;

[0020] Description of reference numerals:

[0021] Core assembly 1, core 11, insulating core rod 2, inner copper strip 3, first positioning hole 31, first connecting portion 32, first bending portion 33, outer copper strip 4, second positioning hole 41, second connecting portion 42, second bending portion 43, first notch a, second notch b. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Reference below Figure 1-Figure 3 , the implementation of the thin film capacitor proposed in the embodiment of the utility model is described in detail.

[0026] The film capacitor according to the embodiment of the utility model comprises: a core group 1, an insulating core rod 2, an inner copper strip 3 and an outer copper strip 4.

[0027] Specifically, the core group 1 has a plurality of cores 11; the insulating core rod 2 is arranged at the winding axis of the core 11; the inner copper strip 3 and the outer copper strip 4 have a first positioning hole 31 and a first connecting portion 32, the first positioning hole 31 can be inserted into the insulating core rod 2 to position the inner copper strip 3, and the first connecting portion 32 is suitable for connecting the electrode surface of the core 11; the outer copper strip 4 has a second positioning hole 41 and a second connecting portion 42, the second positioning hole 41 can be inserted into the insulating core rod 2 so that the outer copper strip 4 overlaps the inner copper strip 3, and the second connecting portion 42 is suitable for connecting the first connecting portion 32. When the outer copper strip 4 overlaps the inner copper strip 3, the outer copper strip 4 can completely or partially cover the upper surface of the inner copper strip 3.

[0028] That is to say, the inner copper strip 3 can be initially positioned on the core group 1 through the first positioning hole 31 and the insulating core rod 2, and connected to each core 11 of the core group 1 through the first connecting portion 32 of the inner copper strip 3, so that the inner copper strip 3 forms an electrical connection with the core group 1; the outer copper strip 4 is positioned and overlapped with the inner copper strip 3 through the second positioning hole 41 and the insulating core rod 2, and then connected to the first connecting portion 32 through the second connecting portion 42 of the outer copper strip 4, so that the outer copper strip 4 forms an electrical connection with the inner copper strip 3. Since the currents of each core 11 need to be connected to the outside after convergence, the current density at the convergence is large. Therefore, the outer copper strip 4 overlaps with the inner copper strip 3 at the convergence, so that the cross-sectional area of ​​the convergence is increased, which is convenient for increasing the current carrying capacity of the convergence. That is to say, it is only increased where the cross-sectional area needs to be increased, avoiding the increase in cost by increasing the overall thickness of the integrated busbar.

[0029] Thus, the inner copper strip 3 and the outer copper strip 4 are positioned by the insulating core rod 2, which facilitates the inner copper strip 3 to connect to the electrode surface of the core 11, and at the same time facilitates the outer copper strip 4 to overlap on the inner copper strip 3. The cross-sectional area of ​​the confluence is increased by overlapping the outer copper strip 4, thereby improving the current carrying capacity of the confluence, which is beneficial to cost control.

[0030] As for the shapes of the insulating core rod 2, the first positioning hole 31 and the second positioning hole 41, the insulating core rod 2 is cylindrical, and the first positioning hole 31 and the second positioning hole 41 are round holes. It can be understood that since the core 11 is wound, a round hole-shaped through hole is formed at its center. The cylindrical setting of the insulating core rod 2 can better match the round hole of the core 11, and the installation of the insulating core rod 2 is more secure. The round hole setting of the first positioning hole 31 and the second positioning hole 41 facilitates the matching of the cylindrical insulating core rod 2, so that the positioning of the inner copper strip 3 and the outer copper strip 4 is more accurate. Among them, the first positioning hole 31 and the second positioning hole 41 can be integrally stamped.

[0031] For the connection between the core 11 and the first connection part 32, the first connection part 32 is arranged on two opposite sides of the length direction of the inner copper strip 3, and one electrode surface of one core 11 is connected to two first connection parts 32. By arranging the first connection parts 32 along two opposite sides of the length direction of the inner copper strip 3, it is convenient for the inner copper strip 3 to form an electrical connection with each core 11 of the core group 1 through the first connection part 32, and connecting two first connection parts 32 through one electrode surface of one core 11, so that the inner copper strip 3 and the electrode surface of the core 11 are more firmly connected. Among them, the first connection part 32 and the electrode surface of the core 11 can be connected by welding.

[0032] As for the shapes of the first connection part 32 and the second connection part 42, the first connection part 32 and the second connection part 42 each have two first notches a, and the two first notches a are arranged at intervals. It can be understood that by setting two notches, the welding points between the inner copper strip 3 and the electrode surface of the core 11 can be increased, so that the welding between the inner copper strip 3 and the electrode surface of the core 11 is more firmly, and at the same time, the welding between the outer copper strip 4 and the inner copper strip 3 is more firmly facilitated. Among them, the first notch a can be formed by integral stamping.

[0033] Furthermore, a second notch b is provided between the two first notches a. It can be understood that the second notch b can be provided to increase the connection area, so that the first connection portion 32 and the second connection portion 42 are more firmly connected, and it is also helpful to evenly distribute the current to avoid concentrating on one welding point and causing severe heat.

[0034] For the connection between the inner copper strip 3 and the outer copper strip 4 and the outside, the inner copper strip 3 is provided with a first bending portion 33, and the outer copper strip 4 is provided with a second bending portion 43. When the outer copper strip 4 overlaps with the inner copper strip 3, the first bending portion 33 overlaps with the second bending portion 43. It can be understood that, through the overlapping arrangement of the first bending portion 33 and the second bending portion 43, it is convenient for the current of each core 11 to finally converge at the overlapping position of the first bending portion 33 and the second bending portion 43, so as to facilitate the connection with the outside, wherein the first bending portion 33 and the second bending portion 43 can be welded after overlapping, and then led out from the outside by busbar switching, or directly welded together with the external lead.

[0035] In addition, the widths of the inner copper strip 3 and the outer copper strip 4 can be set to be consistent, and their lengths and thicknesses can be set according to different usage scenarios. The number of outer copper strips 4 can also be set to multiple, and multiple outer copper strips 4 overlap on the inner copper strip 3.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "inner layer" and "outer layer" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "inner layer" or "outer layer" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, the inner layer feature being "above" or "below" the outer layer feature may include the inner and outer layer features being in direct contact, or may include the inner and outer layer features not being in direct contact but being in contact through another feature between them. Moreover, the inner layer feature being "above", "above" and "above" the outer layer feature includes the inner layer feature being directly above and obliquely above the outer layer feature, or simply means that the inner layer feature is higher in level than the outer layer feature. The inner layer feature being "below", "below" and "below" the outer layer feature includes the inner layer feature being directly below and obliquely below the outer layer feature, or simply means that the inner layer feature is lower in level than the outer layer feature.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A film capacitor, characterized in that: include: Core assembly, insulating core rod, inner copper strip and outer copper strip; The core group has a plurality of cores; The insulating core rod is arranged at the winding axis of the core; The inner copper belt and the outer copper belt have a first positioning hole and a first connecting portion, the first positioning hole can be inserted into the insulating core rod to position the inner copper belt, and the first connecting portion is suitable for connecting the electrode surface of the core; The outer copper strip has a second positioning hole and a second connecting portion. The second positioning hole can be inserted into the insulating core rod so that the outer copper strip overlaps the inner copper strip. The second connecting portion is suitable for connecting the first connecting portion. When the outer copper strip overlaps the inner copper strip, the outer copper strip can fully or partially cover the upper surface of the inner copper strip.

2. The film capacitor according to claim 1, wherein: The insulating core rod is cylindrical, and the first positioning hole and the second positioning hole are circular holes.

3. The film capacitor according to claim 1, wherein: The first connection parts are arranged at two opposite sides of the inner copper strip in the length direction, and an electrode surface of the core is connected to two of the first connection parts.

4. The film capacitor according to claim 1, wherein: The first connecting portion and the second connecting portion each have two first notches, and the two first notches are arranged at intervals.

5. The film capacitor according to claim 4, characterized in that: A second gap is arranged between the two first gaps.

6. The film capacitor according to claim 1, wherein: The inner copper belt is provided with a first bending portion, and the outer copper belt is provided with a second bending portion. When the outer copper belt overlaps with the inner copper belt, the first bending portion overlaps with the second bending portion.

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