Capacitor
By setting an insulating partition between the poles of the capacitor, the problem of insufficient electrical gap design of the capacitor in high voltage and foreign matter polluted environments is solved, the risk of short circuit is reduced, and the safety and redundancy of the capacitor is improved.
Patent Information
- Application Number
- CN202420031514.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-05
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-01-05
AI Technical Summary
In the high voltage application and foreign object polluted environment, existing capacitors have insufficient electrical gap design, resulting in an increase in short circuit risk and is difficult to ensure safety.
Set up an insulating partition between the poles of the capacitor to increase physical isolation, expand electrical gaps, and avoid the risk of short circuit caused by metal foreign matter contamination.
By increasing the insulating partition, the safety margin of the capacitor is effectively improved, the risk of short circuit is reduced, the redundancy of the design is enhanced, and the overall safety of the capacitor is improved.
Smart Images
Figure CN222354951U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor. Background Art
[0002] With the rapid development of power electronics technology, metallized film capacitors are increasingly used in industrial control, new energy, automotive electronics, rail transit, power grids and other fields. At the same time, the failure safety problem of capacitors is becoming more and more prominent.
[0003] At present, the industry generally uses fixed-model IGBT modules, and the corresponding lead terminals are connected to the capacitor terminals to ensure the relevant overcurrent characteristics. However, this connection will have the following problems: Due to certain fluctuations in the voltage application conditions of the capacitor, it often occurs that the original design module needs to use high voltage. The parameters of the electrical clearance are strongly positively correlated with the rated voltage of the capacitor, so the electrical clearance of the positive and negative poles of the capacitor lead terminals has become a major design difficulty. In addition, due to the inevitable presence of foreign matter contamination in the capacitor's operating environment, foreign matter overlaps the electrode surface, which will cause the original limit of the electrical clearance risk to be greater, and there may be a short circuit risk. 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 capacitor, which, in view of the insufficient electrical clearance limit and margin of the existing AC lead-out terminal, proposes a method of adding physical isolation between the poles, increasing the safety margin and improving the design redundancy of the capacitor.
[0005] To achieve the above-mentioned purpose, an embodiment of the utility model provides a capacitor, which includes a housing, a first busbar, a second busbar, a capacitor core and a partition;
[0006] The first busbar draws power from the capacitor core, and the first busbar has a first connection terminal portion suitable for connecting to an external terminal;
[0007] The second busbar is opposite to the first busbar and draws power from the capacitor core, and the second busbar has a second connection terminal portion suitable for connecting to an external terminal;
[0008] The housing has a receiving cavity for receiving the capacitor core connected with the first busbar and the second busbar;
[0009] The partition is arranged outside the accommodation cavity and between the first connection terminal portion and the second connection terminal portion to separate the two, and the partition has insulation properties.
[0010] According to a capacitor of an embodiment of the utility model, an insulating partition is provided between a first connection terminal portion and a second connection terminal portion, and an electrical gap is increased by physical isolation. The partition can increase spatial isolation and avoid the risk of short circuit caused by metal foreign matter contamination.
[0011] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a front view of the capacitor involved in Embodiment 1 of the utility model;
[0013] Figure 2 It is a three-dimensional diagram of a capacitor involved in Embodiment 1 of the present utility model;
[0014] Figure 3 It is a schematic diagram of the internal structure of the capacitor involved in Embodiment 1 of the present utility model;
[0015] Figure 4 is a schematic diagram of a capacitor element assembly according to Embodiment 1 of the present utility model;
[0016] Figure 5 is a schematic diagram of another viewing angle of the capacitor element assembly involved in Embodiment 1 of the present utility model;
[0017] Figure 6 It is a partially exploded schematic diagram of a capacitor involved in Embodiment 1 of the utility model;
[0018] Figure 7 It is a front view of a capacitor involved in Embodiment 2 of the present utility model;
[0019] Figure 8 is a three-dimensional diagram of a capacitor according to Embodiment 2 of the present utility model;
[0020] Fig. 9 It is a schematic diagram of a capacitor element assembly involved in Example 2 of the present utility model.
[0021] Description of labels:
[0022] Capacitor core 100;
[0023] A first busbar 200, a first connection terminal portion 201, and a first electrode terminal 202;
[0024] A second busbar 300, a second connection terminal portion 301, and a second electrode terminal 302;
[0025] Shell 400, accommodating cavity 401, through hole 402;
[0026] Partition 500;
[0027] Filling resin 600;
[0028] A first insulating sheet 701, a second insulating sheet 702, and a third insulating sheet 703;
[0029] Sealing plate 800. DETAILED DESCRIPTION
[0030] 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.
[0031] The following is combined with Figure 1-Figure 9 The capacitor according to the embodiment of the present utility model is described in detail.
[0032] like Figure 1 and Figure 2 As shown, the capacitor according to the embodiment of the present invention includes a capacitor core 100 , a first bus bar 200 , a second bus bar 300 , a housing 400 and a partition 500 .
[0033] Specifically, combined Figure 3 The first busbar 200 draws electricity from the capacitor core 100, and the first busbar 200 has a first connection terminal portion 201 suitable for connecting to an external terminal; the second busbar 300 is opposite to the first busbar 200 and draws electricity from the capacitor core 100, and the second busbar 300 has a second connection terminal portion 301 suitable for connecting to an external terminal; the shell 400 has a accommodating cavity 401, which accommodates the capacitor core 100 connected with the first busbar 200 and the second busbar 300; the partition 500 is arranged outside the accommodating cavity 401 and is located between the first connection terminal portion 201 and the second connection terminal portion 301 to separate the two, and the partition 500 has insulation.
[0034] In other words, the first connection terminal part 201 and the second connection terminal part 300 are AC lead-out terminals, and there is a gap between the first connection terminal part 201 and the second connection terminal part 300, and the gap is an electrical gap. When the gap is relatively small and is at the limit and the margin is insufficient, a partition 500 is provided on the gap. The partition 500 increases physical isolation between the poles, thereby increasing the safety margin of the electrical gap.
[0035] Therefore, according to a capacitor of an embodiment of the utility model, an insulating partition 500 is provided between the first connecting terminal part 201 and the second connecting terminal part 301, and the electrical gap is increased by physical isolation. The partition 500 can increase spatial isolation and avoid the risk of short circuit caused by metal foreign matter contamination.
[0036] The above implementation is the most basic solution of this application, which can solve the problems raised in the background technology and achieve the purpose of this application. The following improves the above basic solution in many aspects to further improve its performance, thereby achieving better implementation effect.
[0037] Embodiment 1
[0038] Figure 3 This is a schematic diagram of the inside of a film capacitor without the resin filling. Figure 3 As shown, the film capacitor includes a plurality of capacitor cores 100, a first busbar 200, a second busbar 300 and a housing 400. The capacitor element assembly is formed by assembling the plurality of capacitor cores 100, the first busbar 200 and the second busbar 300 into one body, and then the capacitor element assembly is accommodated in the accommodation cavity 401 of the housing 400. Then, the housing 400 is filled with a filling resin 600, which is a thermosetting resin, so that the portion of the capacitor element assembly buried in the resin is protected by the housing 400 and the resin 600 from moisture and collision.
[0039] Combination Figure 4 The capacitor core 100 includes two end faces and a peripheral surface connecting the two end faces. The capacitor core 100 as a whole adopts a shape close to a flat cylinder. An end face electrode is formed on one end face of the capacitor core 100 by spraying a metal such as zinc, and another end face electrode is formed on the other end face by spraying the same metal such as zinc. Several capacitor cores 100 are arranged in the left and right directions so that the two end face electrodes face forward and backward respectively. In this state, several capacitor cores 100 are connected to the first busbar 200 and the second busbar 300.
[0040] Combination Figure 5 The first busbar 200 is formed by appropriately cutting and bending a conductive material such as a copper plate, and has a first connection terminal portion 201 and a first electrode terminal 202. The first electrode terminal 202 has a strip-shaped plate shape and extends from one edge of the through hole of the busbar body to the center. A plurality of first electrode terminals 202 may be provided on the busbar body. The plurality of first electrode terminals 202 are suitable for correspondingly fitting and connecting with the end surface electrodes of the plurality of capacitor cores 100.
[0041] For the first connection terminal parts 201 , a plurality of first connection terminal parts 201 are arranged at intervals along the length direction of the busbar body (ie, the left-right arrangement direction of the plurality of capacitor cores 100 ), and each first connection terminal part 201 is formed by bending and led out of the housing 400 .
[0042] Combination Figure 6 The second busbar 300 is also formed by appropriately cutting and bending a conductive material such as a copper plate to form a structure similar to the first busbar 200. The second busbar 300 has a second connection terminal portion 301 and a second electrode terminal 302. The second electrode terminal 302 has a strip-shaped plate shape and extends from one edge of the through hole of the busbar body to the center. A plurality of second electrode terminals 302 can be provided on the busbar body. The plurality of second electrode terminals 302 are suitable for correspondingly fitting and connecting with the end surface electrodes of the plurality of capacitor cores 100.
[0043] For the second connection terminal parts 301 , a plurality of second connection terminal parts 301 are arranged at intervals along the length direction of the busbar body (ie, the left-right arrangement direction of the plurality of capacitor cores 100 ), and each second connection terminal part 301 is formed by bending and led out of the housing 400 .
[0044] After the first connection terminal part 201 and the second connection terminal part 301 are led out of the housing 400, they are arranged at intervals in the horizontal direction (that is, the left-right arrangement direction of the plurality of capacitor cores 100). More specifically, the plurality of first connection terminal parts 201 and the plurality of second connection terminal parts 301 are arranged alternately and at intervals in the horizontal direction, and a partition 500 is provided between adjacent first connection terminal parts 201 and second connection terminal parts 301. Among them, the partition 500 is vertically arranged between the first connection terminal part 201 and the second connection terminal part 301. In this way, the partition 500 is used to form a characteristic structure of physical isolation between the electrodes, increase the physical isolation between the electrodes, effectively block metal particle contamination, and increase spatial isolation.
[0045] Furthermore, the partition 500 is disposed on the housing 400. Specifically, one end of the partition 500 is connected to the outer wall of the housing 400, and the other end extends outward and toward the gap between the first connection terminal portion 201 and the second connection terminal portion 301. In this way, the partition 500 is vertically disposed between the first connection terminal portion 201 and the second connection terminal portion 301.
[0046] More specifically, the root of the partition 500 connected to the outer side wall of the housing 400 can be supported by a triangular plate. When manufacturing the partition 500, the partition 500 can be integrally formed with the housing 400 by injection molding.
[0047] For the housing 400, a through hole 402 is provided on the bottom surface of the housing 400, and the first connection terminal portion 201 and the second connection terminal portion 301 are both led out of the through hole 402 to the outside of the accommodating cavity 401. Afterwards, the sealing plate 800 is abutted against the wall surface around the through hole 402 to seal the through hole 402 of the housing 400. The sealing plate 800 may be an aluminum plate. Therefore, a first insulating sheet 701 may be provided between the second busbar 300 and the sealing plate 800.
[0048] When assembling the capacitor element assembly, the second busbar 300 overlaps the rear end face of the capacitor core 100 from the rear, and the first busbar 200 overlaps the front end face of the capacitor core 100 from the front. Each first electrode terminal 202 and each second electrode terminal 302 are brought into contact with their corresponding end face electrodes, and then joined by a bonding method such as brazing, and the first busbar 200 and the second busbar 300 are separated by a second insulating sheet 702 at the overlapping position.
[0049] Thus, the first busbar 200 and the second busbar 300 are connected to the plurality of capacitor cores 100 and insulated in the overlapping area by the second insulating sheet 702. In this way, the first busbar 200, the second busbar 300, the plurality of capacitor cores 100 and the second insulating sheet 702 are assembled into one body to complete the capacitor element assembly.
[0050] like Figure 6 As shown, the capacitor element assembly is then accommodated in the accommodating cavity of the shell 400 from the bottom, and then a filling resin in a liquid state is injected into the accommodating cavity 401 from the top of the shell 400, so that the space between the capacitor element assembly and the shell 400 is filled with the filling resin 600; if the injection of the filling resin 600 is completed, the filling resin 600 in the shell 400 can be hardened, and the capacitor element assembly is fixed relative to the shell 400 by the hardened filling resin 600, and the through hole of the shell 400 is sealed by the sealing plate 800.
[0051] Embodiment 2
[0052] The structure and principle of this embodiment are roughly the same as those of the first embodiment, and the same parts will not be described in detail. The difference is that Figure 7-Figure 9 The film capacitor includes a plurality of capacitor cores 100, a first busbar 200, a second busbar 300, and a housing 400. The plurality of capacitor cores 100, the first busbar 200, and the second busbar 300 are assembled into one body to form a capacitor element assembly, and the capacitor element assembly is then accommodated in the housing 400. Then, the housing 400 is filled with a filling resin 600.
[0053] Combination Fig. 9The capacitor core 100 includes two end faces and a peripheral surface connecting the two end faces, and the capacitor core 100 as a whole adopts a shape close to a flat cylinder. An end face electrode is formed on one end face of the capacitor core 100 by spraying a metal such as zinc, and another end face electrode is formed on the other end face by spraying the same metal such as zinc. Several capacitor cores 100 are arranged in the left-right direction so that the two end face electrodes 102 face downward and upward respectively. In this state, several capacitor cores 100 are connected to the first busbar 200 and the second busbar 300.
[0054] Combination Fig. 9 The first busbar 200 is formed by appropriately cutting and bending a conductive material such as a copper plate, and has a first connection terminal portion 201 and a first electrode terminal 202. The first electrode terminal 202 has a strip-shaped plate shape and extends from one edge of the through hole of the busbar body to the center. A plurality of first electrode terminals 202 may be provided on the busbar body. The plurality of first electrode terminals 202 are suitable for correspondingly fitting and connecting with the end surface electrodes of the plurality of capacitor cores 100.
[0055] For the first connection terminal parts 201 , a plurality of first connection terminal parts 201 are arranged at intervals along the length direction of the busbar body (ie, the left-right arrangement direction of the plurality of capacitor cores 100 ), and each first connection terminal part 201 is formed by bending and led out of the housing 400 .
[0056] Combination Fig. 9 The second busbar 300 is also formed by appropriately cutting and bending a conductive material such as a copper plate to form a structure similar to the first busbar 200 .
[0057] When assembling the capacitor element assembly, the second busbar 300 overlaps the bottom surface of the capacitor core 100 from below, and the first busbar 200 overlaps the top surface of the capacitor core 100 from above. The first electrode terminals 202 or the electrode terminals of the second busbar 300 are brought into contact with the corresponding end electrodes, and then joined by a bonding method such as brazing, and the overlapping position of the first busbar 200 and the second busbar 300 is separated by a third insulating sheet 703.
[0058] The separator 500 is vertically arranged on the third insulating sheet 703. The separator 500 is vertically arranged between the first connection terminal portion 201 and the second connection terminal portion 301. In this way, the separator 500 is used to form a characteristic structure of physical isolation between electrodes, thereby increasing the physical isolation between the electrodes, effectively preventing metal particle contamination, and increasing spatial isolation.
[0059] Specifically, the partition 500 is a plastic part, and the partition 500 can be integrally formed with the third insulating sheet 703 by injection molding.
[0060] Thus, the first busbar 200 and the second busbar 300 are connected to a plurality of capacitor cores 100, and are insulated in the overlapping area by the third insulating sheet 703, and the partition 500 is erected on the top of the third insulating sheet 703. In this way, the first busbar 200, the second busbar 300, the plurality of capacitor cores 100, the third insulating sheet 703 and the partition 500 are assembled into one piece, completing the capacitor element assembly.
[0061] like Figure 8 As shown, the capacitor element assembly is then accommodated in the shell 400 from above, and then the shell 400 is injected with liquid filling resin, so that the space between the capacitor element assembly and the shell 400 is filled with the filling resin 600; if the filling resin 600 is injected, the filling resin 600 in the shell 400 can be hardened, and the capacitor element assembly is fixed relative to the shell 400 by the hardened filling resin 600.
[0062] 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.
[0063] 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 "several" is two or more, unless otherwise clearly and specifically defined.
[0064] 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.
[0065] 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.
[0066] 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 several 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.
[0067] 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: It includes a shell, a first busbar, a second busbar, a capacitor core and a partition; The first busbar draws power from the capacitor core, and the first busbar has a first connection terminal portion suitable for connecting to an external terminal; The second busbar is opposite to the first busbar and draws power from the capacitor core, and the second busbar has a second connection terminal portion suitable for connecting to an external terminal; The housing has a receiving cavity for receiving the capacitor core connected with the first busbar and the second busbar; The partition is arranged outside the accommodation cavity and between the first connection terminal portion and the second connection terminal portion to separate the two, and the partition has insulation properties.
2. The capacitor according to claim 1, wherein: The first connection terminal portion and the second connection terminal portion are arranged at intervals in a horizontal direction, and the partition plate is vertically disposed between the first connection terminal portion and the second connection terminal portion.
3. The capacitor according to claim 2, characterized in that There are a plurality of the first connection terminal parts and a plurality of the second connection terminal parts, and the plurality of the first connection terminal parts and the plurality of the second connection terminal parts are alternately arranged in a horizontal direction, and a partition is provided between adjacent first connection terminal parts and second connection terminal parts.
4. The capacitor according to claim 1, wherein The partition is arranged on the housing.
5. The capacitor according to claim 4, characterized in that One end of the partition is connected to the outer side wall of the housing, and the other end of the partition extends outward and toward a gap between the first connection terminal portion and the second connection terminal portion.
6. The capacitor according to claim 1, wherein: It also includes an insulating sheet, which is arranged in the overlapping area of the first busbar and the second busbar, and the partition is arranged on the insulating sheet.
7. The capacitor according to claim 6, characterized in that The partition is vertically arranged on the insulating sheet.
8. The capacitor according to claim 1, wherein: The partition is a plastic part.
9. The capacitor according to claim 1, wherein: A through hole is provided on one side of the housing, and the first connection terminal portion and the second connection terminal portion are both led out of the accommodating cavity through the through hole.
10. The capacitor according to claim 9, wherein: The invention further includes a sealing plate and a filling resin. The sealing plate abuts against a wall surface around the through hole, and the filling resin is filled in the accommodating cavity.