Capacitor

Abstract

According to the capacitor provided by the utility model, the thermal resistance of the thin-film capacitor is effectively reduced, and the power density of the thin-film capacitor is improved. The capacitor comprises a capacitor shell, a packaging material and an electrode; the packaging material is filled in the capacitor shell; the lower part of the electrode is buried in the packaging material, the part, exposed out of the packaging material, of the electrode is provided with a supporting plane, and the outer side of the supporting plane is connected with at least one connecting terminal. According to the utility model, the supporting plane is designed at the exposed part of the electrode, the connecting terminal is connected to the supporting plane, and the supporting plane increases the surface area of the exposed part of the electrode, so that the heat exchange efficiency is improved, and the purpose of heat dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor. Background Art

[0002] Film capacitors are widely used in electronic equipment, industrial control, new energy vehicles and other fields. Their structure is mainly composed of positive and negative busbars, capacitor core, capacitor shell and packaging materials.

[0003] For film capacitors used in high-power applications, because a large ripple current passes through the film capacitor, the equivalent series resistance (ESR) of the film capacitor will have a higher heat power under the action of the current, making the heat dissipation of the film capacitor a key technical difficulty.

[0004] In the prior art, a common heat dissipation method is to attach the body of the film capacitor to a cooling plate or a heat sink to remove the heat inside the film capacitor. However, since the body of the film capacitor is generally encapsulated in a plastic shell, the plastic shell has poor thermal conductivity and high thermal resistance, resulting in low heat dissipation efficiency of the existing film capacitor structure. Utility Model Content

[0005] The purpose of the utility model is to provide a capacitor to solve the problems existing in the prior art, effectively reduce the thermal resistance of the film capacitor, and improve the power density of the film capacitor.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A capacitor comprises a capacitor housing, a packaging material and an electrode; the packaging material is filled in the capacitor housing; the lower part of the electrode is buried in the packaging material, and the part exposed from the packaging material is provided with a supporting plane, and the outer side of the supporting plane is connected to at least one connecting terminal.

[0008] The packaging material is made of epoxy resin, silicone or polyurethane.

[0009] The capacitor further comprises an insulating pad and a cooling device; the upper surface of the supporting plane is covered with an insulating pad made of an insulating heat-conducting material; the cooling device is attached to the upper surface of the insulating pad.

[0010] Preferably, the insulating pad is thermally conductive silicone or a thermally conductive silicone sheet.

[0011] Preferably, the temperature reduction device is a cooling plate or a radiator.

[0012] Preferably, the supporting plane and the insulating pad, and the insulating pad and the cooling device are relatively fixed by gluing.

[0013] Preferably, the supporting plane extends out of the side surface of the capacitor housing toward the outside of the capacitor housing.

[0014] After adopting the above technical solution, the utility model has the following technical effects:

[0015] The utility model designs a supporting plane on the exposed part of the electrode in advance, and the connecting terminal is connected to the supporting plane. The supporting plane increases the surface area of ​​the exposed part of the electrode, thereby improving the efficiency of heat exchange and achieving the purpose of heat dissipation. The supporting plane can be used to cooperate with the insulating pad and the cooling device. The insulating pad can ensure the electrical insulation between the electrode and the cooling device. When the capacitor is working, the self-heating of the electrode and the heat generated inside the capacitor are quickly and efficiently conducted to the cooling device through the insulating pad made of insulating heat-conducting material, thereby effectively reducing the thermal resistance of the film capacitor and improving the power density of the film capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of a specific embodiment of the utility model;

[0017] Figure 2 It is an exploded view of a specific embodiment of the utility model;

[0018] Figure 3 It is a front view of a specific embodiment of the utility model;

[0019] Description of Figure Numbers:

[0020] 1----capacitor housing; 2----packaging material; 3----electrode; 31---support plane; 32---connecting terminal; 4----insulating pad; 5----cooling device. DETAILED DESCRIPTION

[0021] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention to be protected.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the embodiments of the present utility model, it should be understood that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use, or is the orientation or position relationship commonly understood by those skilled in the art. It is only to simplify the description for the convenience of describing the embodiments of the present utility model, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present utility model.

[0026] In addition, the terms "first", "second", "third", etc. 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" or "second" 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.

[0027] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connected" 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, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected 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 utility model can be understood according to specific circumstances.

[0028] 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.

[0029] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0030] In addition, the present invention provides examples of various specific processes and materials, but a person skilled in the art may be aware of the application of other processes and / or the use of other materials.

[0031] refer to Figures 1 to 3 As shown, the utility model discloses a capacitor, including a capacitor housing 1, a packaging material 2, an electrode 3, an insulating pad 4 and a cooling device 5;

[0032] The packaging material 2 is filled in the capacitor housing 1;

[0033] The lower part of the electrode 3 is buried in the packaging material 2, and the part exposed from the packaging material 2 is provided with a supporting plane 31, and the outer side of the supporting plane 31 is connected to at least one connecting terminal 32;

[0034] The upper surface of the support plane 31 is covered with an insulating pad 4, which is made of an insulating and heat-conductive material;

[0035] The cooling device 5 is attached to the upper surface of the insulating pad 4 , and the insulating pad 4 can achieve electrical insulation between the cooling device 5 and the supporting plane 31 (ie, the electrode 3 ).

[0036] Specific embodiments of the present utility model are shown below.

[0037] Generally speaking, a capacitor is provided with two electrodes 3, and each electrode 3 is provided with at least one supporting plane 31 located outside the packaging material 2 according to the actual layout design and functional requirements. Figure 2One electrode is provided with two supporting planes 31 (respectively, the supporting plane 31a on the right and the supporting plane 31b below the left side), and the other electrode is provided with one supporting plane 31 (respectively, the supporting plane 31c above the left side).

[0038] The number and direction of the connection terminals 32 led out from the support plane 31 are set according to the actual layout design and functional requirements. Figure 2 The right support plane 31a is connected to two connection terminals 32 by bending downward and then extending horizontally, and the left support planes 31b and 31c are directly extended horizontally to form the connection terminals 32, that is, the extension length of the connection terminals 32 is greater than the width of the corresponding insulating pad 4.

[0039] The packaging material 2 is made of epoxy resin, silicone or polyurethane.

[0040] The above-mentioned insulating pad 4 is thermally conductive silicone or a thermally conductive silicone sheet. When using thermally conductive silicone, a cooling device 5 can be used to flatten the thermally conductive silicone to fill the gap between the supporting plane 31 and the cooling device 5. When using a thermally conductive silicone sheet, since its shape has been determined, the deformation is small and the structure is more stable.

[0041] The temperature-reducing device 5 is a cooling plate or a radiator.

[0042] The supporting plane 31 and the insulating pad 4 , and the insulating pad 4 and the cooling device 5 can be relatively fixed by gluing.

[0043] The support plane 31 extends out of the side of the capacitor housing 1 toward the outside of the capacitor housing 1, which can increase the area of ​​the support plane 31 suspended above the capacitor housing 1, thereby increasing the heat dissipation area and improving the heat dissipation effect.

[0044] The connection terminals 32 and the external device may be mounted by bolt locking, laser welding, resistance welding or other methods, and the ends of the corresponding connection terminals 32 may be provided with holes or various required connection structures.

[0045] Through the above scheme, the utility model designs a supporting plane 31 on the exposed part of the electrode 3, and the connecting terminal 32 is connected to the supporting plane 31. The supporting plane 31 increases the surface area of ​​the exposed part of the electrode 3, thereby improving the efficiency of heat exchange and achieving the purpose of heat dissipation. In addition, the supporting plane 31 can be used to cooperate with the insulating pad 4 and the cooling device 5. The insulating pad 4 can ensure the electrical insulation between the electrode 3 and the cooling device 5. When the capacitor is working, the self-heating of the electrode 3 and the heat generated inside the capacitor are quickly and efficiently conducted to the cooling device 5 through the insulating pad 4 made of insulating thermal conductive material, thereby effectively reducing the thermal resistance of the film capacitor and improving the power density of the film capacitor.

[0046] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A capacitor, Features: Including capacitor housing, packaging materials and electrodes; The packaging material is filled in the capacitor housing; The lower portion of the electrode is buried in the packaging material, and the portion exposed from the packaging material is provided with a supporting plane, and the outer side of the supporting plane is connected to at least one connecting terminal.

2. The capacitor according to claim 1, Features: The packaging material is made of epoxy resin, silicone or polyurethane.

3. The capacitor according to claim 1, Features: It also includes an insulating pad and a cooling device; the upper surface of the supporting plane is covered with an insulating pad, and the insulating pad is made of an insulating heat-conducting material; the cooling device is attached to the upper surface of the insulating pad.

4. The capacitor according to claim 3, Features: The insulating pad is thermally conductive silica gel or a thermally conductive silica gel sheet.

5. The capacitor according to claim 3, Features: The temperature reduction device is a cooling plate or a radiator.

6. The capacitor according to claim 3, Features: The supporting plane and the insulating pad, and the insulating pad and the cooling device are relatively fixed by gluing.

7. The capacitor according to claim 3, Features: The supporting plane extends out of the side surface of the capacitor housing toward the outside of the capacitor housing.

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