Heat dissipation enhanced capacitor

Abstract

The utility model discloses a heat dissipation enhancement type capacitor, comprising a housing which is provided with an accommodating cavity with an opening at one end, and the side wall of one side of the housing is a cooling surface; the at least one capacitor core is arranged in the accommodating cavity, the capacitor core comprises a first end surface and a second end surface, and the first end surface is arranged close to the cooling surface; the extraction electrodes comprise a first electrode and a second electrode, the first electrode is connected to the first end face and is led out of the shell, and the second electrode is connected to the second end face, extends to the position between the first electrode and the inner side wall of the shell and is led out of the shell; and the insulating film is arranged in a region where the first electrode and the second electrode are stacked. According to the technical scheme of the embodiment of the utility model, a better heat dissipation effect can be obtained, and the current resistance of the thin film capacitor is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a heat dissipation enhanced capacitor. 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. However, with the increasing requirements for power density in the automotive field, the requirements for the current resistance of film capacitors are also increasing. In the current technical solution, the bottom of the film capacitor is often set as the cooling surface. Since the two plates of the capacitor core are located at both ends, the two lead electrodes are directly led out from the two end surfaces, so that one lead electrode is far away from the cooling surface at the bottom of the capacitor, resulting in poor heat dissipation effect. Utility Model Content

[0003] 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 heat dissipation enhanced capacitor to obtain a better heat dissipation effect, thereby improving the current resistance of the film capacitor.

[0004] To achieve the above object, an embodiment of the utility model provides a heat dissipation enhanced capacitor, comprising:

[0005] A shell having a receiving cavity with an opening at one end, wherein a side wall of the shell is a cooling surface;

[0006] at least one capacitor core, which is disposed in the accommodating cavity, the capacitor core comprising a first end surface and a second end surface, the first end surface being disposed close to the cooling surface;

[0007] The lead-out electrode comprises a first electrode and a second electrode, wherein the first electrode is connected to the first end surface and led out of the shell, and the second electrode is connected to the second end surface and extends between the first electrode and the inner side wall of the shell and led out of the shell;

[0008] The insulating film is disposed between the regions where the first electrode and the second electrode are stacked.

[0009] According to the heat dissipation enhanced capacitor of the embodiment of the utility model, it includes a shell, at least one capacitor core, an extraction electrode and an insulating film. The shell has a housing cavity with an opening at one end, and one side wall of the housing cavity is a cooling surface. The capacitor core is arranged in the housing cavity and includes a first end face and a second end face, and the first end face is arranged close to the cooling surface. The extraction electrode includes a first electrode and a second electrode, the first electrode is connected to the first end face and is led out of the shell, and the second electrode is connected to the second end face and extends between the first electrode and the inner side wall of the shell and is led out of the shell. As a result, the second electrode is led out of the shell after passing through the cooling surface, which improves the heat dissipation effect of the second electrode, thereby improving the current resistance of the film capacitor.

[0010] In addition, the heat dissipation enhanced capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0011] Optionally, at least one first welding joint is opened at a position of the first electrode corresponding to the first end surface, and an edge of the first welding joint extends radially inward to form a first welding portion; and at least one second welding joint is opened at a position of the second electrode corresponding to the second end surface, and an edge of the second welding joint extends radially inward to form a second welding portion.

[0012] Optionally, the first welding portion and the second welding portion have bent portions bent toward the capacitor core.

[0013] Optionally, the first electrode is provided with at least one first supporting portion, which is formed by the surface of the first electrode being recessed toward the first end surface, and the recess depth of the first supporting portion is adapted to the bending depth of the bending portion; the second electrode is provided with at least one second supporting portion, which is formed by the surface of the second electrode being recessed toward the second end surface, and the recess depth of the second supporting portion is adapted to the bending depth of the bending portion.

[0014] Optionally, each of the first end surface or the second end surface corresponds to at least one first supporting portion or the second supporting portion.

[0015] Optionally, a avoidance hole is provided at a position of the second electrode corresponding to the first welding port.

[0016] Optionally, each of the second end surfaces corresponds to two second welding ports, and the two second welding ports are staggered.

[0017] Optionally, there are multiple capacitor cores, and the multiple capacitor cores are arranged in an array in the accommodating cavity.

[0018] Optionally, drainage holes are provided on the first electrode and / or the second electrode, and the drainage holes are arranged corresponding to the gaps between four adjacent capacitor cores.

[0019] Optionally, the second electrode extends from a side of the capacitor core away from the opening to between the first electrode and an inner side wall of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a heat dissipation enhanced capacitor according to an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of assembling a first electrode and a second electrode according to an embodiment of the utility model;

[0022] Figure 3 FIG. 4 is a schematic structural diagram of a second electrode according to an embodiment of the utility model.

[0023] Description of reference numerals: housing 100 , capacitor core 200 , first electrode 310 , first welding port 311 , drainage hole 312 , second electrode 320 , second welding port 321 , avoidance hole 322 , insulating film 400 . 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] 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.

[0027] Please refer to Figures 1 to 3 The embodiment of the utility model provides a heat dissipation enhanced capacitor, including a housing 100 , at least one capacitor core 200 , lead electrodes and an insulating film 400 .

[0028] Specifically, the housing 100 can be in any shape, for example, a square tube structure, a cylindrical structure, etc. The housing 100 is provided with a receiving cavity with one end open to accommodate other components. In addition, one side wall of the housing 100 is a cooling surface, and the cooling surface can be contacted with an external cooling component or mechanism to conduct heat in the housing 100 to the outside.

[0029] The capacitor core 200 is disposed in the accommodating cavity. It should be noted that the number of the capacitor cores 200 may be one or more, and those skilled in the art may determine the corresponding number of capacitors according to actual implementation needs. In one example, the capacitor core 200 includes a plate, a dielectric, and a metal layer sprayed on a first end face and a second end face. The first end face is disposed close to the cooling surface.

[0030] The lead-out electrode includes a first electrode 310 and a second electrode 320. The first electrode 310 and the second electrode 320 may be in a plate-like structure at their portions opposite to the capacitor core 200. The first electrode 310 is connected to the first end surface and led out of the housing 100. The portion led out of the housing 100 is used for circuit connection. The second electrode 320 is connected to the second end surface and extends between the first electrode 310 and the inner side wall of the housing 100 and then leads out of the housing 100. Specifically, after the second electrode 320 is connected to the second end surface, it may extend from one side of the capacitor core 200 to between the first electrode 310 and the inner side wall (i.e., the cooling surface) of the housing 100 and then lead out of the housing 100. At this time, there is a certain stacking area between the first electrode 310 and the second electrode 320. To prevent the first electrode 310 and the second electrode 320 from short-circuiting, the insulating film 400 is disposed between the stacking areas of the first electrode 310 and the second electrode 320 to separate the two.

[0031] In one example, the second electrode 320 extends from the side of the capacitor core 200 away from the opening to between the first electrode 310 and the inner wall of the shell 100, thereby preventing the second electrode 320 from escaping from the potting material due to external force, and when the assembled capacitor core 200 and the lead-out electrode are placed in the accommodating cavity, the stability of the connection between the capacitor core 200 and the lead-out electrode can be ensured to avoid the two from falling off due to collision.

[0032] In one example, the first electrode 310 may have multiple first connection parts extending out of the shell 100, and the second electrode 320 may also have multiple second connection parts extending out of the shell 100, and the first connection parts and the second connection parts correspond one to one to facilitate circuit connection and ensure the effectiveness of the circuit connection.

[0033] Therefore, through the capacitor provided by the above embodiment, the second electrode 320 is led out of the housing 100 after passing through the cooling surface, thereby improving the heat dissipation effect of the second electrode 320 and further improving the current resistance of the film capacitor.

[0034] In one embodiment of the utility model, at least one first welding port 311 is provided at a position corresponding to the first end face of the first electrode 310, and the edge of the first welding port 311 extends radially inward to form a first welding portion, that is, when the first electrode 310 is connected to the first end face, the first welding portion can be welded to the first end face to ensure the effectiveness of the connection between the first electrode 310 and the first end face. Similarly, at least one second welding port 321 is provided at a position corresponding to the second end face of the second electrode 320, and the edge of the second welding port 321 extends radially inward to form a second welding portion, so that the second electrode 320 and the second end face are fixed by the second welding portion. In one example, the first welding port 311 and the second welding port 321 can be of any shape, such as circular or square.

[0035] In one embodiment, the first welding portion and the second welding portion both have a bending portion bent toward the capacitor core 200. Thus, through the setting of the bending portion, the first electrode 310 and the second electrode 320 can be supported by the first welding portion and the second welding portion, so that the first electrode 310 and the second electrode 320 are not completely attached to the end surface of the capacitor core 200, thereby reducing heat generation.

[0036] In one embodiment, at least one first support portion is provided on the first electrode 310, and the first support portion can be formed by the surface of the first electrode 310 being recessed toward the corresponding first end face, and the recess depth of the first support portion is adapted to the bending depth of the upper bending portion of the first welding portion. Thus, in addition to the first welding portion of the first electrode 310 being in contact with the first end face, the upper surface of the first support portion (i.e., the surface opposite to the first end face) is also in contact with the first end face. Since the first support portion has a certain area, it can well support the first electrode 310, reducing the risk of the first welding portion being broken due to external force.

[0037] In one example, a first supporting portion may be provided on the first electrode 310, and the first supporting portion may be provided in the middle position of the first electrode 310 plate; in another example, two first supporting portions may be provided on the first electrode 310, and the two first supporting portions may be provided at the corners of the first electrode 310 plate and are diagonally arranged, or four first supporting portions may be provided on the first electrode 310, and the four first supporting portions are provided at the four corners of the first electrode 310.

[0038] In another example, each first end surface may correspond to at least one first supporting portion, so as to better protect the first welding portion corresponding to the first end surface.

[0039] Similarly, at least one second support portion is provided on the second electrode 320, and the second support portion is formed by the surface of the second electrode 320 being recessed toward the second end face, and the recess depth of the second support portion is adapted to the bending depth of the bending portion of the second welding portion. Thus, in addition to the second welding portion of the second electrode 320 being in contact with the second end face, the lower surface of the second support portion (i.e., the surface opposite to the second end face) is also in contact with the second end face. Since the second support portion has a certain area, it can well support the second electrode 320, reducing the risk of the second welding portion being broken due to external force.

[0040] As described in the above embodiments, the second electrode 320 may be provided with one, two, four or any other number of second supporting parts.

[0041] In one example, each second end face corresponds to at least one second support portion, so as to better protect the second welding portion corresponding to the second end face. Preferably, each second end face may correspond to two second support portions, and the two second support portions may be arranged diagonally.

[0042] In one embodiment, since there is a stacked region between the second electrode 320 and the first electrode 310, in order to facilitate welding between the first electrode 310 and the first end surface and prevent the presence of the welding spot after welding from affecting the setting of the second electrode 320, an avoidance hole 322 is opened at the position of the second electrode 320 corresponding to the first welding port 311. The avoidance hole 322 can be of any shape, and the size of the avoidance hole 322 can meet the welding conditions and not affect the setting of the second electrode 320, and there is no special limitation on this. In one example, the avoidance hole 322 can be a round hole or a square hole.

[0043] In one embodiment of the utility model, each second end face corresponds to two second welding ports 321, and the two welding ports are staggered. That is, for each second end face, the second electrode 320 can be fixed to the second end face through the two second welding ports 321 to ensure the effectiveness of the fixation and avoid the situation that single-point welding easily causes desoldering. In addition, the two second welding ports 321 are staggered to prevent excessive local heat and increase the service life of the capacitor.

[0044] Similarly, each first end surface may correspond to two first welding openings 311 , and the two first welding openings 311 may be arranged flush with each other or staggered with each other.

[0045] In one embodiment of the present invention, there may be a plurality of capacitor cores 200, and the plurality of capacitor cores 200 are arranged in an array in the accommodation cavity. For example, there may be 9 capacitor cores 200, which are arranged in a 3×3 matrix in the accommodation cavity. The plurality of capacitor cores 200 are connected in parallel by connecting to the first electrode 310 and the second electrode 320, thereby increasing the capacitance of the capacitor.

[0046] Furthermore, when there are multiple capacitor cores 200, drainage holes 312 are provided on the first electrode 310 and / or the second electrode 320, and the drainage holes 312 are provided corresponding to the gaps between four adjacent capacitor cores 200. Thus, the provision of the drainage holes 312 can facilitate the flow of the capacitor potting material so that the potting material can fill the entire accommodating cavity, and can also prevent heat from being concentrated between the first electrode 310, the capacitor core 200 and the second electrode 320, so that the internal heat can be quickly dissipated to the outside, thereby improving the current resistance of the capacitor.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 heat dissipation enhanced capacitor, characterized in that: include: A shell having a receiving cavity with an opening at one end, wherein a side wall of the shell is a cooling surface; at least one capacitor core, which is disposed in the accommodating cavity, the capacitor core comprising a first end surface and a second end surface, the first end surface being disposed close to the cooling surface; The lead-out electrode comprises a first electrode and a second electrode, wherein the first electrode is connected to the first end surface and led out of the shell, and the second electrode is connected to the second end surface and extends between the first electrode and the inner side wall of the shell and led out of the shell; The insulating film is disposed between the regions where the first electrode and the second electrode are stacked.

2. The capacitor according to claim 1, characterized in that At least one first welding joint is formed at a position corresponding to the first end surface of the first electrode, and an edge of the first welding joint extends radially inward to form a first welding portion; at least one second welding joint is formed at a position corresponding to the second end surface of the second electrode, and an edge of the second welding joint extends radially inward to form a second welding portion.

3. The capacitor according to claim 2, characterized in that The first welding portion and the second welding portion have bent portions bent toward the capacitor core.

4. The capacitor according to claim 3, characterized in that The first electrode is provided with at least one first supporting portion, which is formed by the surface of the first electrode being recessed toward the first end surface, and the recess depth of the first supporting portion is adapted to the bending depth of the bending portion; the second electrode is provided with at least one second supporting portion, which is formed by the surface of the second electrode being recessed toward the second end surface, and the recess depth of the second supporting portion is adapted to the bending depth of the bending portion.

5. The capacitor according to claim 4, characterized in that Each of the first end surface or the second end surface corresponds to at least one of the first supporting portion or the second supporting portion.

6. The capacitor according to claim 2, characterized in that An avoidance hole is provided at a position of the second electrode corresponding to the first welding port.

7. The capacitor according to claim 2, characterized in that Each of the second end surfaces corresponds to two second welding ports, and the two second welding ports are staggered.

8. The capacitor according to claim 1, characterized in that There are multiple capacitor cores, and the multiple capacitor cores are arranged in an array in the accommodating cavity.

9. The capacitor according to claim 8, characterized in that The first electrode and / or the second electrode is provided with drainage holes, and the drainage holes are arranged corresponding to the gaps between four adjacent capacitor cores.

10. The capacitor according to claim 1, characterized in that The second electrode extends from a side of the capacitor core away from the opening to between the first electrode and an inner side wall of the housing.

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