Copper strip structure for capacitor core welding and capacitor with same

Abstract

The utility model discloses a copper strip structure used for capacitor core welding and a capacitor with the same, the copper strip structure comprises a copper strip body and at least one first connecting assembly arranged on the copper strip body, and each first connecting assembly is used for being connected with a first capacitor core; the first connecting assembly comprises a first positioning through hole and at least one first connecting part; the second connecting assembly is used for being connected with a second capacitor core, and the size of the second capacitor core is smaller than that of the first capacitor core; the second connecting assembly comprises a second positioning through hole and a second connecting part, one end of the second connecting part is connected with the copper strip body, the other end of the second connecting part is connected with the second capacitor core, and the middle position of the second connecting part is provided with at least one bending position. According to the technical scheme of the embodiment of the utility model, the welding spot stress between the copper strip and the capacitor core can be reduced so as to ensure the stability of the connection between the capacitor core and the copper strip.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a copper strip structure used for capacitor core welding and a capacitor having the same. Background Art

[0002] With the rapid development of power electronics technology, the application of metallized film capacitors in the field of new energy is becoming more and more extensive, and it is widely used in rail transit, power grid, wind power, solar energy and other fields. Among them, DC bus filter capacitors are mainly used for filtering and absorbing spikes, and are characterized by large capacity and small self-inductance. In order to meet the demand for large capacity, the capacitor often adopts a structure in which multiple cores are connected in parallel, and are led out through busbars or copper strips. In order to improve the internal space utilization and energy density, cores of different sizes are often arranged. However, due to the difference in the size of multiple capacitor cores and capacitor cores, it is easy to have irregular arrangement of capacitor cores, unstable relative distances, poor consistency in the position and size of solder joints at welding points, and thus cause greater stress. Therefore, how to reduce the stress of the solder joints between the copper strip and the capacitor core to ensure the stability of the connection between the capacitor core and the copper strip. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the above-mentioned technology to a certain extent at least. To this end, the purpose of the utility model is to provide a copper strip structure for capacitor core welding and a capacitor having the same, so as to reduce the stress of the welding point between the copper strip and the capacitor core, so as to ensure the stability of the connection between the capacitor core and the copper strip.

[0004] To achieve the above-mentioned purpose, the embodiment of the utility model proposes a copper strip structure for capacitor core welding, characterized in that it includes a copper strip body and:

[0005] At least one first connecting component, each of which is used to connect to a first capacitor core; the first connecting component includes a first positioning through hole and at least one first connecting portion;

[0006] A second connecting component is used to connect to a second capacitor core, the size of the second capacitor core is smaller than the size of the first capacitor core; the second connecting component includes a second positioning through hole and a second connecting portion, one end of the second connecting portion is connected to the copper strip body, and the other end is connected to the second capacitor core, and the middle position of the second connecting portion has at least one bend.

[0007] According to the copper strip structure of the embodiment of the utility model, it includes a copper strip body and at least one first connecting component and a second connecting component arranged on the copper strip body, each first connecting component is connected to a first capacitor core, the first connecting component includes a first positioning through hole and at least one first connecting part, the second connecting component is used to connect to the second capacitor core, the size of the second capacitor core is smaller than the size of the first capacitor core, the second connecting component includes a second positioning through hole and a second connecting part, one end of the second connecting part is connected to the copper strip body, and the other end is connected to the second capacitor core, and the middle position of the second connecting part has at least one bending point, thereby, through the setting of the second connecting component, it can be used to weld capacitor cores of different sizes, and the middle position of the second connecting part has at least one bending point, so that the second connecting part has a certain extensibility, so that after welding is completed, the solder joint stress can be reduced, thereby ensuring the stability of the connection between the copper strip and the capacitor core.

[0008] In addition, the copper strip structure for capacitor core welding proposed in the above embodiment of the utility model may also have the following additional technical features:

[0009] Optionally, the second connecting component further includes an avoidance portion, and the second connecting portion can pass through the avoidance portion to be connected to the capacitor core.

[0010] Optionally, the second connecting portion is integrally formed with the copper strip body, and the second connecting portion extends from an edge of the avoidance portion toward a center thereof.

[0011] Optionally, the second connecting part is a lead, a copper belt or a metal braided belt, one end of the second connecting part is connected to the surface of the copper belt body on a side away from the second capacitor core, and the other end passes through the avoidance part to be connected to the second capacitor core.

[0012] Optionally, the number of the first connecting parts in each of the first connecting components is two, and the two first connecting parts are respectively arranged on both sides of the first positioning through hole along the width direction of the copper strip body.

[0013] Optionally, the first connection portion is integrally formed with the copper belt body, a plurality of first notches are arranged at intervals on the long sides of the copper belt body, and the first connection portion is located at the first notches and protrudes outwardly along the width direction of the copper belt body.

[0014] Optionally, a second notch is provided at one end of the first connecting portion away from the copper strip body.

[0015] An embodiment of the utility model further provides a capacitor, comprising the copper strip structure for capacitor core welding as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a copper strip structure for capacitor core welding according to one embodiment of the utility model;

[0017] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0018] Figure 3 It is a structural schematic diagram of a copper strip structure for capacitor core welding according to another embodiment of the utility model, wherein the second connecting portion is a lead;

[0019] Figure 4 This is a schematic structural diagram of a copper strip structure for capacitor core welding according to another embodiment of the utility model, wherein the second connecting portion is a copper strip;

[0020] Figure 5 for Figure 1 A partial enlarged view of point B in the middle.

[0021] Explanation of reference numerals: copper strip body 100, first recess 110, first connecting component 200, first positioning through hole 210, first connecting portion 220, second connecting component 300, second positioning through hole 310, second connecting portion 320, second recess 321, avoidance portion 330, first capacitor core X, second capacitor core Y. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] It should be understood that in order to meet the demand for large capacitor capacity, multiple cores are connected in parallel inside the capacitor, and then led out through busbars or copper strips. In order to improve the space utilization inside the capacitor and increase the energy density, capacitor cores of different sizes can be arranged. However, the cores are not arranged regularly, the relative distance is not fixed, and the position and size of the solder joints at the welding point are not consistent, resulting in greater stress on the solder joints.

[0026] For this, please refer to Figure 1 and Figure 2 The embodiment of the utility model provides a copper strip structure for capacitor core welding, the copper strip structure comprising a copper strip body 100 and at least one first connecting component 200 and a second connecting component 300 disposed on the copper strip body 100. The first connecting component 200 and the second connecting component 300 are used to connect a first capacitor core X and a second capacitor core Y, respectively, wherein the first capacitor core X and the second capacitor core Y may be formed by winding a metallized film on a core rod.

[0027] Specifically, the copper strip body 100 is generally rectangular and may have a certain length for welding multiple capacitor cores. The copper strip body 100 may be made of copper. In other embodiments, the copper strip body 100 may also be made of other metal materials with higher conductivity, which is not specifically limited in this application.

[0028] The first connecting assembly 200 is arranged on the copper strip body 100. It should be noted that the number of the first connecting assembly 200 can be one, two or more than two. When the number of the first connecting assembly 200 is multiple, the multiple first connecting assemblies 200 can be arranged at intervals along the length direction of the copper strip body 100, and each first connecting assembly 200 can be connected to a first capacitor core X. Each first connecting assembly 200 includes a first positioning through hole 210 and at least one first connecting portion 220. The shape of the first positioning through hole 210 can be adapted to the cross-sectional shape of the core rod of the first capacitor core X, so that the two can cooperate to achieve the positioning of the capacitor core. One end of the first connecting portion 220 is connected to the copper strip body 100, and the other end is connected to the electrode surface of the first capacitor core X. The production personnel can weld the distal end of the first connecting portion 220 to the electrode surface of the first capacitor core X to achieve the fixation of the two.

[0029] It should be noted that in each first connecting component 200, the number of the first connecting parts 220 can be one, two or any number above two. Those skilled in the art can determine the corresponding number according to actual implementation needs, and there is no special limitation on this.

[0030] The second connecting component 300 is used to connect with the second capacitor core Y, and the size of the second capacitor core Y is smaller than the size of the first capacitor core X. Similarly, the number of the second connecting components 300 can also be one, two or more, and the first connecting component 200 and the second connecting component 300 can be arranged at intervals along the length direction of the copper strip body 100. When the number of the second connecting components 300 is multiple, due to the small size of the second capacitor core Y, if the width of the copper strip body 100 allows, the second connecting components 300 and the second connecting components 300 can be arranged at intervals along the width direction of the copper strip body 100. Of course, they can also be arranged at intervals along the length direction of the copper strip body 100, or arranged in a matrix, which is not particularly limited.

[0031] The second connection assembly 300 includes a second positioning through hole 310 and a second connection portion 320, wherein the shape of the second positioning through hole 310 is adapted to the cross-sectional shape of the core rod of the second capacitor core Y, and thus the two can cooperate to achieve the positioning of the second capacitor core Y. One end of the second connection portion 320 is connected to the copper strip body 100, and the other end is connected to the electrode surface of the second capacitor core Y, and the middle position of the second connection portion 320 has at least one bend, so that the second connection portion 320 can have a certain degree of stretchability, thereby reducing the stress on the solder joint and ensuring the stability of the connection between the copper strip and the capacitor core.

[0032] It should be noted that the bending direction of the bend can be any direction, for example, it can be a horizontal bend or a vertical bend. Furthermore, when there are multiple bends, the bending directions of the multiple bends can be the same or different.

[0033] Thus, the copper strip structure for capacitor core welding provided by the embodiment of the utility model includes a copper strip body 100 and at least one first connecting component 200 and a second connecting component 300 arranged on the copper strip body 100, each first connecting component 200 is connected to a first capacitor core X, the first connecting component 200 includes a first positioning through hole 210 and at least one first connecting portion 220, the second connecting component 300 is used to connect to the second capacitor core Y, the size of the second capacitor core Y is smaller than the size of the first capacitor core X, and the second connecting component 300 includes a second positioning through hole 310 And a second connecting part 320, one end of the second connecting part 320 is connected to the copper strip body 100, and the other end is connected to the second capacitor core Y, and the middle position of the second connecting part 320 has at least one bend. Therefore, through the setting of the second connecting component 300, it can be used to weld capacitor cores of different sizes, and the middle position of the second connecting part 320 has at least one bend, so that the second connecting part 320 has a certain stretchability, so that after the second connecting part 320 and the electrode surface of the second capacitor core Y are welded, the welding point stress can be reduced, thereby ensuring the stability of the connection between the copper strip and the capacitor core.

[0034] Please refer to Figure 2 In one embodiment of the utility model, the second connection assembly 300 further includes a relief portion 330, which can be a through-hole structure of any shape, through which the electrode surface of the second capacitor core Y can be exposed from the copper strip body 100, and the second connection portion 320 can pass through the relief portion 330 to connect with the electrode surface of the capacitor core. It should be understood that, due to the small size of the second capacitor core Y, the relief portion 330 can be arranged close to the second positioning through hole 310 or overlap with the second positioning through hole 310. In one embodiment, the relief portion 330 overlaps with the second positioning through hole 310.

[0035] In one embodiment of the present invention, the second connection part 320 is integrally formed with the copper strip body 100, for example, the copper strip body 100 can be stamped to form the second connection part 320, and the second connection part 320 extends from the edge of the avoidance part 330 to the center thereof. At this time, the bend on the second connection part 320 can be bent in the horizontal direction, for example, by setting the bend, the second connection part 320 is L-shaped as a whole. It should be noted that the present application does not limit the bending angle of the bend, and it is only necessary to make the second connection part 320 have a certain degree of stretchability.

[0036] Please refer to Figure 3 and Figure 4In other embodiments of the present invention, the second connection part 320 may be a lead, a copper belt or a metal braided belt. In this case, one end of the second connection part 320 is connected to the surface of the copper belt body 100 away from the capacitor core, and the other end passes through the avoidance part 330 and is connected to the second capacitor core Y. Thus, the use of a flexible connection can reduce costs, reduce welding stress, and improve welding efficiency.

[0037] Please refer to Figure 1 In one embodiment of the utility model, the number of the first connection parts 220 in each first connection component 200 is two, and the two first connection parts 220 are respectively arranged on both sides of the first positioning through hole 210 along the width direction of the copper strip body 100. In this way, the stability of the connection between the first connection component 200 and the first capacitor core X can be ensured. In one example, the two first connection parts 220 are respectively located on both sides of the first positioning through hole 210, and a V-shape, a slash shape (such as " / " or "\") or a straight shape can be formed between the two first connection parts 220 and the first positioning through hole 210. The present application does not specifically limit the setting position of the first connection part 220.

[0038] Please refer to Figure 1 and Figure 5 In one embodiment, the first connection part 220 is integrally formed with the copper strip body 100, and the copper strip body 100 can be stamped to form the first connection part 220. Specifically, the two long sides of the copper strip body 100 can be provided with a plurality of first notches 110 at intervals, and the first connection part 220 is located at the first notches 110, that is, a first connection part 220 can be provided at each first notch 110, and the first connection part 220 protrudes outward along the width direction of the copper strip body 100. The first connection part 220 can have a certain width to meet the welding requirements.

[0039] In one embodiment, a second recess 321 is provided at one end of the first connection portion 220 away from the copper strip body 100. The second recess 321 can be provided at the end position of the first connection portion 220. When welding, welding can be performed at the second recess 321, thereby ensuring the stability of the welding between the first connection portion 220 and the first capacitor core X, and also improving the welding efficiency.

[0040] It is worth noting that in the present application, the first connecting part 220 and the second connecting part 320 of different shapes and numbers are used to weld the first capacitor core X and the second capacitor core Y. On the basis of ensuring the connection strength, the plasticity of the first capacitor core X and the second capacitor core Y after welding with the copper strip body 100 is also improved.

[0041] The present utility model embodiment also provides a capacitor, which includes a copper strip structure for capacitor core welding as described in any of the above embodiments. Therefore, the copper strip structure for capacitor core welding provided by the utility model embodiment includes a copper strip body 100 and at least one first connection component 200 and a second connection component 300 arranged on the copper strip body 100, each first connection component 200 is connected to a first capacitor core X, the first connection component 200 includes a first positioning through hole 210 and at least one first connection portion 220, the second connection component 300 is used to connect to a second capacitor core Y, the size of the second capacitor core Y is smaller than the size of the first capacitor core X, and the second connection component 300 includes a second positioning through hole 310 And a second connecting part 320, one end of the second connecting part 320 is connected to the copper strip body 100, and the other end is connected to the second capacitor core Y, and the middle position of the second connecting part 320 has at least one bend. Therefore, through the setting of the second connecting component 300, it can be used to weld capacitor cores of different sizes, and the middle position of the second connecting part 320 has at least one bend, so that the second connecting part 320 has a certain stretchability, so that after the second connecting part 320 and the electrode surface of the second capacitor core Y are welded, the welding point stress can be reduced, thereby ensuring the stability of the connection between the copper strip and the capacitor core.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 copper strip structure for capacitor core welding, characterized in that: It includes a copper belt body and: At least one first connecting component, each of which is used to connect to a first capacitor core; the first connecting component includes a first positioning through hole and at least one first connecting portion; A second connecting component is used to connect to a second capacitor core, the size of the second capacitor core is smaller than the size of the first capacitor core; the second connecting component includes a second positioning through hole and a second connecting portion, one end of the second connecting portion is connected to the copper strip body, and the other end is connected to the second capacitor core, and the middle position of the second connecting portion has at least one bend.

2. The copper strip structure according to claim 1, characterized in that: The second connecting component further includes an avoidance portion, and the second connecting portion can pass through the avoidance portion to be connected to the capacitor core.

3. The copper strip structure according to claim 2, characterized in that: The second connection portion is integrally formed with the copper strip body, and the second connection portion extends from the edge of the avoidance portion toward the center thereof.

4. The copper strip structure according to claim 2, characterized in that: The second connecting part is a lead, a copper belt or a metal braided belt, one end of the second connecting part is connected to the surface of the copper belt body on a side away from the second capacitor core, and the other end passes through the avoidance part to be connected to the second capacitor core.

5. The copper strip structure according to claim 1, characterized in that: The number of the first connection parts in each of the first connection components is two, and the two first connection parts are respectively arranged on both sides of the first positioning through hole along the width direction of the copper strip body.

6. The copper strip structure according to claim 5, characterized in that: The first connection portion is integrally formed with the copper belt body. A plurality of first notches are arranged at intervals on the long side of the copper belt body. The first connection portion is located at the first notches and protrudes outward along the width direction of the copper belt body.

7. The copper strip structure according to claim 6, characterized in that: A second notch is disposed at one end of the first connection portion away from the copper strip body.

8. A capacitor, characterized in that: The invention comprises a copper strip structure for capacitor core welding as claimed in any one of claims 1 to 7.

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