Capacitor

Abstract

The utility model provides a capacitor, which can improve the heat dissipation effect of the capacitor in a low-cost mode. The capacitor comprises a capacitor shell, a capacitor core, a packaging material, a first busbar and a second busbar, the capacitor core is arranged in the capacitor shell; the packaging material is filled in the capacitor shell; the first busbar and the second busbar are both buried in the packaging material and are lapped on two end surfaces of the capacitor core respectively; the first busbar and the second busbar are respectively provided with a first connecting terminal and a second connecting terminal which are exposed out of the packaging material; the surface of the capacitor housing is provided with at least one heat radiation fin.

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 commonly used heat dissipation method is to attach the body of the film capacitor to a cooling plate or a radiator to extract the heat inside the film capacitor. This requires additional equipment costs such as cooling plates and radiators, and requires a larger installation space, and cannot be applied to occasions with limited installation space. At the same time, the cooling plate or radiator needs to be installed separately by the user, which is not convenient enough. Utility Model Content

[0005] The purpose of the utility model is to provide a capacitor to solve the problems existing in the prior art and to improve the heat dissipation effect of the capacitor in a low-cost manner.

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

[0007] A capacitor comprises a capacitor housing, a capacitor core, a packaging material, a first bus and a second bus; the capacitor core is arranged in the capacitor housing; the packaging material is filled in the capacitor housing; the first bus and the second bus are both buried in the packaging material and overlapped on the two end surfaces of the capacitor core respectively; the first bus and the second bus are respectively provided with a first connecting terminal and a second connecting terminal exposed in the packaging material; and at least one heat dissipation fin is provided on the surface of the capacitor housing.

[0008] The capacitor housing is provided with a cavity with a side opening, the capacitor core, the first busbar and the second busbar are all arranged in the cavity, and the packaging material is encapsulated in the cavity.

[0009] Preferably, the heat dissipation fins are arranged at equal intervals on the upper surface of the capacitor housing; and foot seats are provided on both sides of the capacitor housing.

[0010] Preferably, a metal compression limiting sleeve is arranged in the foot seat.

[0011] The packaging material is made of epoxy resin, silicone or polyurethane.

[0012] The first busbar includes a first pole piece and a second pole piece, the thickness of the second pole piece is smaller than the thickness of the first pole piece; the second pole piece is connected to one end face of the capacitor core, the first pole piece is overlapped on the second pole piece, and the first connecting terminal is provided; the second busbar includes a third pole piece and a fourth pole piece, the thickness of the fourth pole piece is smaller than the thickness of the third pole piece; the fourth pole piece is connected to the other end face of the capacitor core, the third pole piece is overlapped on the fourth pole piece, and the second connecting terminal is provided.

[0013] Preferably, the second pole piece is provided with a first connecting pin connected to one end surface of the capacitor core, and the fourth pole piece is provided with a second connecting pin connected to the other end surface of the capacitor terminal.

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

[0015] The utility model can increase the surface area of ​​the capacitor housing by arranging at least one heat dissipation fin on the surface of the capacitor housing, so as to dissipate the heat generated by the capacitor when it is working in the form of heat exchange. Compared with using a cooling plate or a radiator, the utility model has lower cost and does not occupy a large space, which is conducive to the application of the product in a small installation space. At the same time, the capacitor can be equipped with heat dissipation fins when it leaves the factory, and no additional installation is required, which is more convenient. 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 cross-sectional view of a specific embodiment of the utility model;

[0019] Description of Figure Numbers:

[0020] 1---capacitor housing; 11---heat sink; 12---cavity; 13---foot;

[0021] 2----Capacitor core;

[0022] 3----Packaging materials;

[0023] 4----first busbar; 41---first pole piece; 411--first connecting terminal; 42---second pole piece; 421--first connecting pin;

[0024] 5----the second busbar; 51---the third pole piece; 511--the second connecting terminal; 52---the fourth pole piece; 521--the second connecting pin;

[0025] 6----Metal compression limiter. DETAILED DESCRIPTION

[0026] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] refer to Figures 1 to 3 As shown, the utility model discloses a capacitor, comprising a capacitor housing 1, a capacitor core 2, a packaging material 3, a first bus bar 4 and a second bus bar 5;

[0037] The capacitor core 2 is arranged in the capacitor housing 1;

[0038] The packaging material 3 is filled in the capacitor housing 1;

[0039] The first busbar 4 and the second busbar 5 are both buried in the packaging material 3 and overlapped on both end surfaces of the capacitor core 2 respectively; the first busbar 4 and the second busbar 5 are respectively provided with a first connection terminal 411 and a second connection terminal 511 exposed in the packaging material 3;

[0040] At least one heat dissipation fin 11 is disposed on the surface of the capacitor housing 1 .

[0041] Specific embodiments of the present utility model are shown below.

[0042] The capacitor housing 1 is provided with a cavity 12 with a side opening, the capacitor core 2 , the first busbar 4 and the second busbar 5 are all arranged in the cavity 12 , and the packaging material 3 is potted in the cavity 12 .

[0043] Furthermore, the heat dissipation fins 11 are arranged at equal intervals on the upper surface of the capacitor housing 1; both sides of the capacitor housing 1 are provided with foot seats 13 for locking the capacitor with bolts. In this embodiment, a metal pressure limiting sleeve 6 is arranged inside the foot seats 13.

[0044] The packaging material 3 is made of epoxy resin, silicone or polyurethane.

[0045] The first busbar 4 includes a first pole piece 41 and a second pole piece 42, the thickness of the second pole piece 42 is less than the thickness of the first pole piece 41; the second pole piece 42 is connected to one end face of the capacitor core 2, the first pole piece 41 is overlapped on the second pole piece 42, and the first connecting terminal 411 is provided; the second busbar 5 includes a third pole piece 51 and a fourth pole piece 52, the thickness of the fourth pole piece 52 is less than the thickness of the third pole piece 51; the fourth pole piece 52 is connected to the other end face of the capacitor core 2, the third pole piece 51 is overlapped on the fourth pole piece 52, and the second connecting terminal 511 is provided. By arranging the second pole piece 42 and the fourth pole piece 52 with thinner thickness on the two end faces of the capacitor core 2, and making the first pole piece 41 and the third pole piece 51 overlap with the second pole piece 42 and the fourth pole piece 52 respectively, the overall resistance value of the first busbar 4 and the second busbar 5 is lower. According to the formula P=I 2 R, since the current I passing through the capacitor is constant, the smaller the resistance, the less heat is generated, thereby avoiding overheating of the first bus 4 and the second bus 5, reducing the overall heat generation of the capacitor, and improving the working stability of the product. At the same time, since the second pole piece 42 and the fourth pole piece 52 are thinner and use less material, the cost is lower.

[0046] Furthermore, the second pole piece 42 is provided with a first connection pin 421 connected to one end surface of the capacitor core 2 , and the fourth pole piece 52 is provided with a second connection pin 521 connected to the other end surface of the capacitor core 2 .

[0047] Through the above scheme, the utility model can increase the surface area of ​​the capacitor housing 1 by arranging at least one heat dissipation fin 11 on the surface of the capacitor housing 1, so as to achieve the heat dissipation generated by the capacitor when working in the form of heat exchange. Compared with the use of cooling plates and radiators, the cost is lower and it does not take up a lot of space, which is conducive to the application of products in small installation spaces; at the same time, the capacitor can be equipped with heat dissipation fins 11 when leaving the factory, and no additional installation is required, which is more convenient.

[0048] 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, characterized in that: It includes a capacitor housing, a capacitor core, a packaging material, a first bus bar and a second bus bar; The capacitor core is arranged in the capacitor housing; The packaging material is filled in the capacitor housing; The first busbar and the second busbar are both buried in the packaging material and overlapped on both end surfaces of the capacitor core respectively; the first busbar and the second busbar are respectively provided with a first connecting terminal and a second connecting terminal exposed in the packaging material; At least one heat dissipation fin is arranged on the surface of the capacitor housing.

2. The capacitor according to claim 1, wherein: The capacitor housing is provided with a cavity with a side opening, the capacitor core, the first busbar and the second busbar are all arranged in the cavity, and the packaging material is encapsulated in the cavity.

3. The capacitor according to claim 2, wherein: The heat dissipation fins are arranged at equal intervals on the upper surface of the capacitor housing; and foot seats are arranged on both sides of the capacitor housing.

4. The capacitor according to claim 3, wherein: A metal compression limiting sleeve is arranged in the foot seat.

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

6. The capacitor according to claim 1, wherein: The first busbar includes a first pole piece and a second pole piece, the thickness of the second pole piece is smaller than the thickness of the first pole piece; the second pole piece is connected to one end face of the capacitor core, the first pole piece is overlapped on the second pole piece, and the first connecting terminal is provided; the second busbar includes a third pole piece and a fourth pole piece, the thickness of the fourth pole piece is smaller than the thickness of the third pole piece; the fourth pole piece is connected to the other end face of the capacitor core, the third pole piece is overlapped on the fourth pole piece, and the second connecting terminal is provided.

7. The capacitor according to claim 6, wherein: The second pole piece is provided with a first connection pin connected to one end surface of the capacitor core, and the fourth pole piece is provided with a second connection pin connected to the other end surface of the capacitor terminal.

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