CN216528451U

CN216528451U - Capacitor busbar and capacitor

Info

Publication number: CN216528451U
Application number: CN202122613782.4U
Authority: CN
Inventors: 郭乐强; 陈树木; 苏世鑫
Original assignee: XIAMEN FARATRONIC CO Ltd
Current assignee: XIAMEN FARATRONIC CO Ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-05-13
Anticipated expiration: 2031-10-28

Abstract

The utility model provides a capacitor bus bar and a capacitor, wherein the capacitor bus bar comprises: the connecting part extends from a specified edge of the main body part to a direction orthogonal to the thickness direction of the main body part, the connecting part is provided with a transition section and an extension section, the thickness of the extension section is thinner than that of the main body part, the transition section is positioned between the extension section and the main body part, and the transition section is constructed in a structure that the thickness is gradually increased from the extension section to be the same as that of the main body part. Therefore, the situation that the bus bar is broken in the manufacturing process of the capacitor and the capacitor is easy to deform can be avoided while the connection part and the end face electrode are well welded and combined.

Description

Capacitor busbar and capacitor

Technical Field

The utility model relates to the technical field of capacitors. In particular to a capacitor busbar and a capacitor.

Background

As the film capacitor is widely applied to new energy vehicles such as electric vehicles and hybrid vehicles, higher requirements are put on the power density of the film capacitor. The thin film capacitor mainly comprises a core, a busbar, filling resin and a shell, wherein an electrode terminal on the busbar and an end surface electrode on the core are combined through welding and then are installed in the shell, and the shell is filled with the resin. When the power density of the thin film capacitor is improved, the current passing through the busbar is correspondingly improved, and in order to reduce the heating of the capacitor, the increase of the thickness of the busbar is an effective measure. However, when the thick electrode terminal is welded to the end face electrode, poor welding is likely to occur or the capacitor core is heated to cause functional failure.

In the related art, as shown in fig. 1 to 3, the electrode terminal 11 on the busbar 1 is flattened so that the thickness of the electrode terminal 11 is thinner than the thickness of the main body portion 12 of the busbar 1, and thus the electrode terminal 11 and the end surface electrode can be well welded and bonded while reducing heat generation of the capacitor.

However, in the above structure, the root portion 11a of the electrode terminal 11 is subjected to a large stress during soldering or before curing of the potting resin, and is easily deformed or broken, resulting in a functional failure of the capacitor.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first object of the present invention is to provide a capacitor bus bar, which can avoid stress concentration of electrode terminals and prevent the bus bar from breaking or deforming.

A second object of the present invention is to provide a capacitor.

To achieve the above object, the present invention provides, in a first aspect, a capacitor busbar including:

a main body portion;

a connecting portion extending from a predetermined edge of the main body portion in a direction orthogonal to a thickness direction of the main body portion, the connecting portion having a transition section and an extension section, the extension section having a thickness thinner than that of the main body portion, the transition section being located between the extension section and the main body portion, and the transition section having a thickness gradually increasing from the extension section to a thickness equal to that of the main body portion.

According to the capacitor busbar provided by the embodiment of the utility model, the strength of the connecting part can be effectively improved through the thickness of the transition section, the local stress concentration of the connecting part is avoided, and the heat applied to the connecting part by the soldering iron can be weakened at the transition section during welding, so that the connecting part and the end face electrode are ensured to be well welded and combined, the phenomenon that the busbar is broken in the capacitor manufacturing process and the capacitor is easy to deform is avoided.

In addition, the capacitor busbar provided in the above embodiment of the present invention may further have the following additional technical features:

optionally, the connecting portion includes a first surface opposite to the end-face electrode of the capacitor core and a second surface opposite to the first surface, and the second surface of the transition section has a curved surface.

Further, the second surface of the transition section has a flat surface, and the flat surface extends from the second surface of the main body part and is connected with the curved surface.

Further, the plane is formed by extending a distance of not less than 0.5mm from the predetermined edge of the main body portion to the curved surface.

Optionally, the curved surface is arranged to protrude from the second surface to the first surface.

Further, the chamfer angle of the curved surface is 30-60 degrees.

Optionally, the first surface of the main body portion, the first surface of the transition section, and the first surface of the extension section are one plane.

Optionally, the thickness of the extension section is 50% to 80% of the thickness of the main body portion.

The utility model provides a capacitor in a second aspect, which comprises a capacitor core and a capacitor bus bar, wherein an end surface electrode is arranged on the end surface of the capacitor core, the capacitor bus bar is connected with the end surface electrode, and the capacitor bus bar is the capacitor bus bar.

According to the capacitor provided by the embodiment of the utility model, through the arrangement of the capacitor bus bar, the stress concentration of the electrode terminal on the bus bar can be avoided, and the bus bar is prevented from being broken or deformed.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a schematic structural diagram of a capacitor busbar in the prior art;

fig. 2 is a top view of a prior art capacitor bus bar;

fig. 3 is a cross-sectional view a-a of a prior art capacitor bus bar;

FIG. 4 is a schematic structural diagram of a capacitor semi-finished product according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a capacitor busbar according to an embodiment of the utility model;

fig. 6 is a plan view of a capacitor bus bar according to an embodiment of the present invention;

fig. 7 is a B-B sectional view of a capacitor bus bar according to an embodiment of the present invention;

description of reference numerals:

the capacitor comprises a capacitor busbar 100, a main body part 110, a connecting part 120, a transition section 121, an extension section 122 and a connecting terminal group 130;

capacitor core 200, and end face electrode 210.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The capacitor busbar and the capacitor according to the present invention are described in detail below with reference to fig. 4 to 7.

As shown in fig. 5, the capacitor busbar 100 provided by the present invention includes: a body portion 110 and a connecting portion 120. The main body 110 is a bus bar of the capacitor bus bar 100 in this embodiment, and the connection portion 120 is an electrode terminal of the capacitor bus bar 100 in this embodiment.

Specifically, the connecting portion 120 extends from a predetermined edge of the main body portion 110 in a direction orthogonal to the thickness direction of the main body portion 110, the connecting portion 120 includes a transition portion 121 and an extension portion 122, a thickness r1 of the extension portion 122 is thinner than a thickness r2 of the main body portion 110, the transition portion 121 is located between the extension portion 122 and the main body portion 110, and the thickness of the transition portion 121 increases from the extension portion 122 to be the same as the thickness of the main body portion 110.

With reference to fig. 4 and 6, in some examples, the connecting portion 120 is disposed in the through hole of the main body portion 110, and the connecting portion 120 is a transition section 121 and an extension section 122 extending from a front end edge of an inner wall of the through hole to a direction orthogonal to the thickness direction of the main body portion 110; wherein the extension 122 is approximately rectangular parallelepiped in shape, and the transition 121 is approximately ramp in shape. The thickness r1 of the extension section 122 is thinner than the thickness r2 of the main body portion 110, and the thickness of the transition section 121 increases from the extension section 122 to be the same as the thickness r2 of the main body portion 110. For example, the thickness r2 of the main body portion 110 is set to 0.6 mm, while the thickness r1 of the extension 122 is 0.3 mm, and the thickness of the transition section 121 increases from 0.3 mm at the boundary with the extension 122 to 0.6 mm at the boundary with the main body portion 110. Further, the first surface 122a of the extension section 122, the first surface 121a of the transition section 121, and the first surface 110a of the main body section 110, which are opposed to the end-face electrodes of the capacitor core, are overlapped on one face in the thickness direction thereof. Then, a second surface 121b of the transition section 121 opposite to the first surface is inclined. Thus, compared to the case where the second surface of the transition section 121 is perpendicular to the second surface of the extension section 122, heat applied to the electrode terminal during welding is easily transferred at the extension section 122, can be gradually weakened at the transition section 121, is difficult to move to the main body section 110, and can ensure good welding bonding of the electrode terminal to the end-face electrode; moreover, the transition section 121 gradually increases the thickness of the root of the electrode terminal, so that when a soldering iron contacts the electrode terminal, stress can be dispersed, and local stress is prevented from being large, so that the capacitor busbar cannot be broken; in addition, before the capacitor potting resin is cured, the transition section 121 can bear larger stress, so that the phenomenon of breakage of the capacitor busbar is avoided.

Of course, in another example, referring to fig. 4, the connection portion 120 may extend from a predetermined edge of the body portion 110 in a direction orthogonal to the thickness direction of the body portion 110 from the rear end edge of the body portion 110.

Therefore, according to the capacitor busbar 100 of the embodiment of the utility model, the strength of the connecting part 120 can be effectively improved through the thickness of the transition section 122, local stress concentration of the connecting part 120 is avoided, and heat applied to the connecting part 120 by a soldering iron can be weakened at the transition section 122 during soldering, so that the connecting part 120 and the end face electrode are well soldered and combined, and meanwhile, the phenomenon that the busbar is broken in the capacitor manufacturing process can be avoided.

In some examples, the second surface 122b of the transition section 122 has a curved surface 122b 1. The curved surface 122b1 causes the transition section 122 to increase in thickness from the boundary with the extension section 122 to the boundary with the body portion 110. And the curved surface 122b1 may allow the transition section 122 to better carry stresses than an inclined straight surface.

Further, the second surface 122b of the transition section 122 has a flat surface 122b2, and the flat surface 122b2 extends from the second surface 110b of the main body 110 and is connected to the curved surface 122b 1. This further improves the stress-bearing capacity of the transition piece 122. Of course, in other examples, the curved surface 122b1 may extend directly from the second surface 110b of the body portion 110.

In some examples, the flat surface 122b2 is formed to extend from a defined edge of the body portion 110 to the curved surface 122b 1a distance of 0.5mm or more. Specifically, the plane 122b2 is formed to extend from the edge of the second surface 110b of the main body 110a distance greater than or equal to 0.5mm, so that the transition section 122 can better carry stress.

In some examples, curved surface 122b1 is convexly disposed from the second surface toward the first surface. In other words, the curved surface 122b1 is concave to the first surface, not convex to the second surface.

In some examples, the chamfer α of the curved surface is 30 ° -60 °. This ensures that the transition piece 122 is better able to carry stresses while attenuating heat.

In some examples, the thickness r1 of the extension section 122 is 50% to 80% of the thickness of the main body portion r 2. For example, the thickness r2 of the main body portion 110 is set to 0.6 mm, and the thickness r1 of the extension 122 is 0.3 mm or 0.48 mm.

Fig. 4 is a schematic structural view of a capacitor semi-finished product, which includes a capacitor busbar 100 and a capacitor core 200, wherein an end face electrode 210 is formed on one end face of the capacitor core 200 by spraying metal such as zinc, and an end face electrode is also formed on the other end face by spraying metal such as zinc. The 2 capacitor elements 200 are arranged in the vertical direction with both end surfaces facing in the front-rear direction. The capacitor busbar 100 processes a conductive material into a predetermined shape, for example, by appropriately cutting and bending or folding a copper plate to form a main body portion 110, a connection portion 120, a through hole, and a connection terminal group 130. The connection part 120 may be formed in the through hole or at the edge of the body part 110. The connection portion 120 is connected to the end-face electrode 210 by soldering so that the capacitor bus bar 100 is electrically connected to the end-face electrode 210. Through the above-mentioned structural design to the capacitor busbar 100, the stress concentration of the electrode terminal on the busbar can be avoided, and the busbar is prevented from breaking or deforming.

For the capacitor, it may further include a filling resin and a case, and the filling resin and the case may have conventional structures and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A capacitor busbar, comprising:

a main body portion;

2. The capacitor busbar according to claim 1, wherein the connecting portion comprises a first surface opposite to the end-face electrode of the capacitor core and a second surface opposite to the first surface, and the second surface of the transition section has a curved surface.

3. The capacitor busbar according to claim 2, wherein the second surface of the transition section has a flat surface extending from the second surface of the main body portion and engaging with the curved surface.

4. The capacitor busbar according to claim 3, wherein the plane is formed by extending a distance of 0.5mm or more from the predetermined edge of the main body portion to the curved surface.

5. The capacitor busbar according to claim 2, wherein the curved surface is arranged to protrude from the second surface to the first surface.

6. The capacitor busbar according to claim 5, wherein the chamfer of the curved surface is 30 ° to 60 °.

7. The capacitor busbar according to claim 2, wherein the first surface of the main body portion, the first surface of the transition section, and the first surface of the extension section are one plane.

8. The capacitor busbar according to claim 1, wherein the thickness of the extension section is 50% to 80% of the thickness of the main body portion.

9. A capacitor, characterized in that, including capacitor core and capacitor mother row, have terminal surface electrode on the terminal surface of capacitor core, the capacitor mother row with terminal surface electrode connection, the capacitor mother arranges to be the capacitor of any one of claims 1-8 arranges.