Capacitor

Abstract

The utility model discloses a capacitor, which comprises a metal shell, a capacitor core, a first electrode and a second electrode, an accommodating cavity with an opening in one side is defined by the metal shell; the capacitor core is arranged in the accommodating cavity of the metal shell; the first electrode is connected with the first end face of the capacitor core, and the first electrode is led out of the metal shell; the first end face of the capacitor core is opposite to the first end face, the second electrode is connected with a second end face, opposite to the first end face, of the capacitor core, the second electrode is led out of the metal shell, an insulating part is arranged between the second electrode and the metal shell, and the insulating part at least partially wraps the second electrode and the capacitor core. Under the condition that the power density of the capacitor is improved, the capacitor provided by the utility model has better insulating property, and solves the problem of insulation between the metal shell and the electrodes.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors. Background Art

[0002] With the rapid development of power electronics technology, metallized film capacitors have been widely used in the field of new energy vehicles. Film capacitors generally include capacitor cores, lead electrodes, packaging shells and filling resins; capacitor cores contain plates, dielectrics and metal layers sprayed on both end faces of the dielectric. The lead electrodes are generally leads, welding pieces or busbars, and the filling resin can be epoxy resin.

[0003] In the related art, the packaging shell is usually a plastic shell. The plastic shell has poor thermal conductivity, and the heat generated by the capacitor cannot be dissipated in time. The capacitor has poor ripple current resistance and cannot meet the high power requirements of the market.

[0004] However, as the power density requirements for film capacitors in the automotive field continue to increase, the traditional plastic shells of film capacitors are gradually unable to meet the high power requirements of the electronic control market, and metal shells are needed. The use of metal shells requires solving insulation problems, which gave rise to this case. Utility Model Content

[0005] 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, one purpose of the utility model is to provide a capacitor with better insulation performance while improving the power density of the capacitor, and solve the insulation problem between the metal shell and the electrode.

[0006] In order to achieve the above-mentioned object, the first embodiment of the utility model provides a capacitor, comprising:

[0007] A metal shell, wherein the metal shell defines a receiving cavity with an opening on one side;

[0008] A capacitor core, the capacitor core is placed in the accommodating cavity of the metal shell;

[0009] A first electrode, the first electrode is connected to a first end surface of the capacitor core, and the first electrode is led out of the metal shell;

[0010] A second electrode is connected to a second end face of the capacitor core opposite to the first end face, the second electrode is led out of the metal shell, an insulating member is provided between the second electrode and the metal shell, and the insulating member at least partially covers the second electrode and the capacitor core.

[0011] According to a capacitor of an embodiment of the utility model, an insulating member is provided between the second electrode and the metal shell, and the insulating member at least partially covers the second electrode and the capacitor core, so that the capacitor has better insulation performance while improving the power density, thereby solving the insulation problem between the metal shell and the electrode.

[0012] In addition, a capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0013] Optionally, a U-shaped groove is formed on the insulating member, and the capacitor core is accommodated in the U-shaped groove.

[0014] Specifically, an embedding groove is formed at the bottom of the U-shaped groove of the insulating member, and the embedding groove accommodates a welding point generated by welding the second electrode and the capacitor core.

[0015] Optionally, the insulating member is a plastic member or insulating paper.

[0016] Optionally, the capacitor core is a metallized film capacitor core.

[0017] Optionally, the second electrode is led out of the metal shell along the second end surface of the capacitor core and a side surface adjacent to the second end surface.

[0018] Optionally, the insulating member is coated on the bottom surface and side surfaces of the capacitor core and the second electrode, wherein the area of ​​the side coated portion accounts for one third of the side area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0020] Figure 2 It is a partial structural schematic diagram of an embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0022] Description of symbols

[0023] Metal shell 1 , accommodating cavity 11 , capacitor core 2 , first electrode 3 , second electrode 4 , insulating member 5 , U-shaped groove 51 , embedding groove 52 . DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] like Figures 1 to 3 As shown, a capacitor according to an embodiment of the utility model includes a metal shell 1, a capacitor core 2, a first electrode 3 and a second electrode 4.

[0027] The metal shell 1 defines a receiving cavity 11 with one side open, and the receiving cavity 11 is used to place the capacitor core 2 .

[0028] The capacitor core 2 is placed in the accommodating cavity 11 of the metal shell 1. Optionally, the capacitor core 2 is a metallized film capacitor core.

[0029] The first electrode 3 is connected to the first end surface of the capacitor core 2, and the first electrode 3 is led out of the metal shell 1. The first electrode 3 may be a positive electrode.

[0030] The second electrode 4 is connected to the second end face of the capacitor core 2 opposite to the first end face, and the second electrode 4 is led out of the metal shell 1. Optionally, the second electrode 4 is led out of the metal shell 1 along the second end face of the capacitor core 2 and the side face adjacent to the second end face. An insulating member 5 is provided between the second electrode 4 and the metal shell 1, and the insulating member 5 at least partially covers the second electrode 4 and the capacitor core 2.

[0031] Optionally, the insulating member 5 is a plastic member or insulating paper, and the material includes PPS (polyphenylene sulfide), PC (polycarbonate), PBT (polybutylene terephthalate), and PET (polyethylene terephthalate).

[0032] According to a capacitor of an embodiment of the utility model, an insulating member 5 is provided between the second electrode 4 and the metal shell 1, and the insulating member 5 at least partially covers the second electrode 4 and the capacitor core 2, so that the capacitor has better insulation performance while improving the power density, thereby solving the insulation problem between the metal shell and the electrode.

[0033] Optionally, a U-shaped groove 51 is formed on the insulating member 5, and the capacitor core 2 is accommodated in the U-shaped groove 51. Specifically, an embedding groove 52 is formed at the bottom of the U-shaped groove 51 of the insulating member 5, and the embedding groove 52 accommodates the welding point generated by welding the second electrode 4 and the capacitor core 2, so that the insulating member 5 is installed more firmly and is not easy to slide.

[0034] Optionally, the insulating member 5 is coated on the bottom and side surfaces of the capacitor core 2 and the second electrode 4, wherein the area of ​​the side coated portion accounts for one third of the side area.

[0035] 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.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] 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.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] 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.

[0040] 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 capacitor, characterized in that: include: A metal shell, wherein the metal shell defines a receiving cavity with an opening on one side; A capacitor core, the capacitor core is placed in the accommodating cavity of the metal shell; A first electrode, the first electrode is connected to a first end surface of the capacitor core, and the first electrode is led out of the metal shell; A second electrode is connected to a second end face of the capacitor core opposite to the first end face, the second electrode is led out of the metal shell, an insulating member is provided between the second electrode and the metal shell, and the insulating member at least partially covers the second electrode and the capacitor core.

2. A capacitor according to claim 1, characterized in that: A U-shaped groove is formed on the insulating member, and the capacitor core is accommodated in the U-shaped groove.

3. A capacitor according to claim 2, characterized in that: An embedding groove is formed at the bottom of the U-shaped groove of the insulating member, and the embedding groove accommodates a welding point generated by welding the second electrode and the capacitor core.

4. A capacitor according to claim 1, characterized in that: The insulating member is a plastic member or insulating paper.

5. A capacitor according to claim 1, characterized in that: The capacitor core is a metallized film capacitor core.

6. A capacitor according to claim 1, characterized in that: The second electrode is led out of the metal shell along the second end surface of the capacitor core and the side surface adjacent to the second end surface.

7. A capacitor according to claim 1, characterized in that: The insulating member is coated on the bottom surface and the side surface of the capacitor core and the second electrode, wherein the area of ​​the side surface coated portion accounts for one third of the area of ​​the side surface.

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