CN216450517U - Capacitor busbar and capacitor - Google Patents

Abstract

The utility model provides a capacitor bus bar and a capacitor, wherein the capacitor bus bar comprises: the electrode comprises a main body and an electrode terminal, wherein one surface of the main body and the electrode terminal, which is opposite to an end surface electrode, is a first surface, and the other surface of the main body and the electrode terminal, which is opposite to the first surface, is a second surface; the electrode terminal extends from the specified edge of the main body to the direction orthogonal to the thickness direction of the main body, the electrode terminal is provided with a bending part and an extending part, the first surface of the extending part is suitable for being welded and attached with the end surface electrode, the bending part is positioned between the extending part and the main body, and the bending part is bent and deformed from the specified edge of the main body to the thickness direction of the main body until the first surface of the extending part is lower than the first surface of the main body. Therefore, the electrode terminal can be tightly attached to the end face electrode, the contact resistance between the busbar and the core is reduced, the failure risk of electric parameters of the capacitor is reduced, the moisture resistance of the capacitor is ensured, and the condition that the busbar is broken in the manufacturing process of the capacitor is avoided.

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 increased, the current passing through the busbar is correspondingly increased, and in order to reduce the heating of the capacitor, it is an effective measure to ensure that the electrode terminal is in close contact with the end face electrode to reduce the contact resistance.

In the related art, as shown in fig. 1 and 2, the electrode terminal 11 and the body portion 12 are in the same plane on a side opposite to the end-face electrode 21. Thus, due to the difference in the size of the core 2, part of the electrode terminals 11 cannot be tightly attached to the end face electrodes 21, and the welding process needs to be filled with more welding solders 3, so that the contact resistance of the solders 3 is large and the cost is high; secondly, the stacking height of the welding solder 3 butted on the end surface electrode 21 in the welding process is generally more than or equal to 1mm and exceeds the thickness of the main body part of the busbar 1, and the higher solder 3 easily causes assembly interference of other components in the capacitor and even damages the adjacent protective insulating layer, thereby causing the risk of functional failure of the capacitor; moreover, in order to ensure the welding effect, the core 2 is tightly attached to the bus bar 1, so that the thickness of a resin layer wrapped on the surface layer of the core is insufficient, the moisture resistance is reduced, and the service life of the capacitor is shortened; in addition, the root of the electrode terminal bears a large stress during soldering or before curing of the potting resin, and is easily broken, resulting in 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, the first purpose of the utility model is to provide a capacitor busbar, which can ensure that an electrode terminal is tightly attached to an end face electrode, avoid stress concentration of the electrode terminal, prevent the busbar from being broken, and meet the requirements of mechanical performance and electrical performance of a product in a using process.

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

In order to achieve the above object, the present invention provides a capacitor busbar in a first aspect, including a main body and an electrode terminal, where one surface of the main body and the electrode terminal opposite to an end-face electrode is a first surface, and the other surface opposite to the first surface is a second surface;

the electrode terminal extends from a predetermined edge of the main body in a direction orthogonal to a thickness direction of the main body, and has a bent portion and an extended portion, a first surface of the extended portion is adapted to be welded to an end surface electrode, the bent portion is located between the extended portion and the main body, and the bent portion is configured to be bent and deformed from the predetermined edge of the main body in the thickness direction of the main body until the first surface of the extended portion is lower than the first surface of the main body.

According to the capacitor busbar provided by the embodiment of the utility model, the electrode terminal is flexible through the arrangement of the bending part, the size deviation of the core can be compensated in the welding process of the electrode terminal and the end surface electrode, so that the electrode terminal and the end surface electrode are tightly attached, and the contact resistance between the busbar and the core is reduced; secondly, the first surface of the extension part is lower than the first surface of the main body through the bending part, so that the part (extension part) welded by the electrode terminal and the end surface electrode sinks, more welding solders can be contained, the height of the welding solders cannot interfere the semi-finished product to be installed in the shell, and the risk of failure of capacitance electrical parameters is reduced; moreover, the welded part (extending part) of the electrode terminal and the end face electrode sinks, so that the thickness of filling resin wrapped by the core can be ensured, and the moisture resistance of the capacitor is ensured; in addition, the bent portion can avoid local stress concentration of the electrode terminal, and heat applied to the extending portion by a soldering iron can be weakened at the bent portion during soldering, so that the phenomenon that the mother bar is broken in a capacitor manufacturing process can be avoided while good soldering bonding of the electrode terminal and the end face electrode is ensured.

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

optionally, the main body extends out of a transition portion in a direction orthogonal to the thickness direction of the main body, a first surface of the transition portion and a first surface of the main body are one surface, a second surface of the transition portion and a second surface of the main body are one surface, the transition portion is located between the bending portion and the main body, and a boundary between the transition portion and the bending portion is a specified edge of the main body.

Further, the length of the transition part is more than or equal to 0.5 mm.

Optionally, the bending portion is formed with a first arc segment adjacent to the main body and a second arc segment adjacent to the extension portion.

Further, the bending direction of the first circular arc segment is opposite to the bending direction of the second circular arc segment.

Further, the bending direction of the first circular arc segment faces the first surface, and the bending direction of the second circular arc segment faces the second surface.

Further, the bending angle of the bending part is 30 to 90 °.

Optionally, the electrode terminal is integrally formed with the body.

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 an end surface of the capacitor core, and the capacitor bus bar is the capacitor bus bar.

According to the capacitor provided by the embodiment of the utility model, the electrode terminal is flexible due to the arrangement of the bending part in the capacitor bus bar, the size deviation of the core can be compensated in the welding process of the electrode terminal and the end surface electrode, so that the electrode terminal and the end surface electrode are tightly attached, and the contact resistance between the bus bar and the core is reduced; secondly, the first surface of the extension part is lower than the first surface of the main body through the bending part, so that the part (extension part) welded by the electrode terminal and the end surface electrode sinks, more welding solders can be contained, the height of the welding solders cannot interfere the semi-finished product to be installed in the shell, and the risk of failure of capacitance electrical parameters is reduced; moreover, the welded part (extending part) of the electrode terminal and the end face electrode sinks, so that the thickness of filling resin wrapped by the core can be ensured, and the moisture resistance of the capacitor is ensured; in addition, the bent portion can avoid local stress concentration of the electrode terminal, and heat applied to the extending portion by a soldering iron can be weakened at the bent portion during soldering, so that the phenomenon that the mother bar is broken in a capacitor manufacturing process can be avoided while good soldering bonding of the electrode terminal and the end face electrode is ensured.

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 schematic illustration of a prior art capacitor semi-finished product (solder-bearing weld structure);

fig. 3 is a schematic structural diagram of a capacitor busbar according to an embodiment of the utility model;

fig. 4 is a plan view of a capacitor bus bar according to an embodiment of the present invention;

fig. 5 is a B-B sectional view of a capacitor bus bar according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a capacitor semi-finished product according to an embodiment of the present invention;

FIG. 7 is a schematic view of a resin-coated busbar (welded structure with brazing filler metal) and core according to an embodiment of the utility model;

FIG. 8 is a schematic view illustrating an assembly of a bus bar and a core having a non-uniform width according to an embodiment of the present invention;

FIG. 9 is a partial enlarged view at H of FIG. 8;

description of reference numerals:

a capacitor busbar 100;

a main body 110, a transition part 111, and a through hole 112;

the electrode terminal 120 (120'), the bent portion 121, the first arc section 1211, the second arc section 1212, the extension portion 122;

a connection terminal group 130;

capacitor element 200(200 '), end face electrode 210 (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 with reference to fig. 3 to 9.

As shown in fig. 3 and 9, the capacitor busbar 100 according to the present invention includes: a body 110, and an electrode terminal 120. The main body 110 is a bus bar of the capacitor busbar 100 in this embodiment, and the electrode terminal 120 may be welded to an end surface electrode 210 of the capacitor core 200 (the end surface electrode 210 may also be regarded as a core metal-sprayed layer) to electrically connect the capacitor busbar 100 and the capacitor core 200. In the present embodiment is defined: the surface of the body 100 and the electrode terminal 120 opposite to the end-face electrode 210 is a first surface a (lower surface in the corresponding drawing), and the surface opposite to the first surface a is a second surface b (upper surface in the corresponding drawing).

Specifically, the electrode terminal 120 extends from a predetermined edge of the body 110 in a direction orthogonal to the thickness direction of the body 110, the electrode terminal 120 includes a bent portion 121 and an extended portion 122, a first surface 122a of the extended portion 122 is adapted to be welded to the end-face electrode 210, the bent portion 121 is located between the extended portion 122 and the body 110, and the bent portion 121 is configured to be bent and deformed from the predetermined edge of the body 110 in the thickness direction of the body 110 until the first surface 122a of the extended portion 122 is lower than the first surface 110a of the body 110.

In other words, the thickness direction of the body 110 is defined as the Z-axis direction, the length direction of the body 110 is defined as the X-axis direction, and the direction orthogonal to the thickness direction of the body 110 is defined as the Y-axis direction, and the bending portion 121 is configured to be bent and deformed from the predetermined edge of the body 110 to the thickness direction of the body 110 until the first surface 122a of the extension portion 122 is lower than the first surface 110a of the body 110, that is, the electrode terminal 120 extends from the predetermined edge of the body 110 in the Z-axis and Y-axis directions, wherein the bending portion 121 may extend in the Z-axis and Y-axis directions, and the extension portion 122 extends in the Y-axis direction. The first surface 122a of the extension 122 is lower than the first surface 110a of the body 110, which may be understood as a sink process of the electrode terminal 120 with respect to the body 110, and the depth of the sink is greater than 0.

Therefore, according to the capacitor busbar of the embodiment of the utility model, the electrode terminal 120 is flexible due to the arrangement of the bending part 121, the dimensional deviation of the core can be compensated in the welding process with the end surface electrode 210, the electrode terminal 120 and the end surface electrode 210 are tightly attached, and the contact resistance between the busbar and the core is reduced, for example: in fig. 8 and 9, the width of the capacitor core 200 on the left is smaller than that of the capacitor core 200 ' on the right, and the electrode terminal 120 corresponding to the capacitor core 200 on the left is brought into close contact with the end electrode 210 of the capacitor core 200 on the left by the electrode terminal 120 having flexibility on the capacitor bus bar 100, and the electrode terminal 120 ' corresponding to the capacitor core 200 ' on the right is slightly compressed to be brought into close contact with the end electrode 210 ' of the capacitor core 200 ' on the right. Secondly, the bent portion 121 makes the first surface 122a of the extension portion 122 lower than the first surface 110a of the body 110, so that the portion (the extension portion 122) where the electrode terminal 120 and the end-face electrode 210 are welded sinks, more welding filler metal can be accommodated, the height of the welding filler metal does not interfere with the semi-finished product to be installed in the housing, and the risk of failure of capacitance electrical parameters is reduced, for example: in fig. 7, the semi-arc area of the extension 122 is solder, and the height thereof is lower than the second surface 110b of the main body 110. Furthermore, the welded portion (extension portion 122) of the electrode terminal 120 and the end-face electrode 210 sinks, so as to ensure the thickness of the filling resin wrapped by the core and the moisture-proof performance of the capacitor, for example: in fig. 7, the resin coating is shown in the area of the diagonal boxes with sufficient clearance to ensure adequate resin coating thickness. In addition, the bent portion 121 of the present embodiment can prevent local stress concentration of the electrode terminal 120, compared to the case where the root portion of the electrode terminal is perpendicular to the main body, and the heat applied to the extending portion 122 by the soldering iron can be weakened at the bent portion 121 during soldering, thereby preventing the mother bar from being broken during the manufacturing process of the capacitor while ensuring good soldering bonding of the electrode terminal 120 and the end-face electrode 210.

In some examples, with reference to fig. 5, the main body 110 extends a transition portion 111 in a direction orthogonal to a thickness direction of the main body 110, a first surface 111a of the transition portion 111 is in a plane with the first surface 110a of the main body 110, a second surface 111b of the transition portion 111 is in a plane with the second surface 110b of the main body 110, the transition portion 111 is located between the bent portion 121 and the main body 110, and a boundary of the transition portion 111 and the bent portion 121 is a prescribed edge of the main body 110. Specifically, the electrode terminal 120 may be disposed in a through hole of the main body 110, for example, as shown in fig. 5, the transition portion 111 extends from a front end edge of one inner wall of the through hole 112 of the main body 100 to a direction orthogonal to the thickness direction of the main body 100; alternatively, the transition portion 111 extends from the rear end edge of the main body 100 in a direction orthogonal to the thickness direction of the main body 100. Thus, the provision of the transition portion 111 can improve the strength of the electrode terminal 120 while providing flexibility to the electrode terminal 120, as compared to when the electrode terminal 120 is extended directly from the front end edge of one inner wall of the through-hole 112 or from the rear end edge of the main body 100.

Optionally, the length of the transition 111 is ≧ 0.5 mm. That is, a transition portion 111 is formed by extending a length of not less than 0.5mm from a front end edge of one inner wall of the through hole 112 of the main body 100 or from a rear end edge of the main body 100 in a direction orthogonal to the thickness direction of the main body 100, and the electrode terminal 120 is extended from a free end of the transition portion 111. Thereby improving the strength of the electrode terminal 120 while ensuring the flexibility of the electrode terminal 120.

The transition portion 111 has a shape that expands in width toward the end edge of the main body at the boundary with the main body 110.

In some examples, in conjunction with fig. 5, the curved portion 121 is formed with a first arc section 1211 and a second arc section 1212, the first arc section 1211 being adjacent to the body 110, and the second arc section 1212 being adjacent to the extension 122. It is understood that the first circular arc 1211 extends from the main body 110, and the second circular arc 1212 extends from the first circular arc 1211 to the extending portion 122. The first arc section 1211 is bent in a direction opposite to the second arc section 1212. For example, the bending direction of the first arc section 1211 faces the first surface, and the bending direction of the second arc section 1212 faces the second surface, so that the whole bending portion 121 is similar to an S shape, thereby making the electrode terminal 120 flexible, and capable of matching with capacitor cores 200 of various width dimensions, making the welded portion of the electrode terminal 120 and the end face electrode 210 capable of accommodating more welding solders, ensuring the thickness of the filling resin wrapped by the core, ensuring the moisture resistance of the capacitor, and meeting the requirements of mechanical property and electrical property of the product in the using process.

In some examples, bend angle of bend 121 is 30 ° -90 °. Wherein, the bending angle is the included angle between the tangent line of the circular arc and the horizontal line. The bending angle is set to 30 ° to 90 ° to ensure the flexibility of the electrode terminal 120 and the strength of the electrode terminal 120.

Fig. 6 is a schematic structural view of a capacitor semi-finished product including a capacitor bus bar 100 and a capacitor core 200, wherein an end surface electrode 210 is formed on one end surface of the capacitor core 200 by spraying metal such as zinc, and an end surface electrode is also formed on the other end surface 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 110, an electrode terminal 120, a through hole 112, and a connection terminal group 130. The electrode terminal 120 may be formed within the through-hole 112 or at the edge of the body 110. The electrode terminals 120 are connected to the end-face electrodes 210 by soldering so that the capacitor bus bar 100 is electrically connected to the end-face electrodes 210. Through the structural design of the capacitor busbar 100, the electrode terminal 120 is flexible, the dimensional deviation of the core can be compensated in the welding process of the electrode terminal 120 and the end surface electrode 210, the electrode terminal 120 and the end surface electrode 210 are tightly attached, and the contact resistance between the busbar and the core is reduced. Secondly, the first surface 122a of the extension part 122 is lower than the first surface 110a of the main body 110 by the bending part 121, so that the part (the extension part 122) where the electrode terminal 120 and the end surface electrode 210 are welded sinks, more welding solder can be contained, the height of the welding solder does not interfere with the semi-finished product to be installed in the shell, and the risk of capacitance electrical parameter failure is reduced. Furthermore, the welded portion (extension portion 122) of the electrode terminal 120 and the end-face electrode 210 sinks, so that the thickness of the filling resin wrapped by the core can be ensured, and the moisture-proof performance of the capacitor can be ensured. In addition, local stress concentration of the electrode terminal 120 can be prevented, and heat applied to the extension portion 122 by a soldering iron can be weakened at the bent portion 121 at the time of soldering, whereby the occurrence of fracture or deformation of the bus bar during the capacitor manufacturing process can be prevented while ensuring good soldering bonding of the electrode terminal 120 to the end-face electrode 210.

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 and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 (8)

1. A capacitor busbar comprises a main body and electrode terminals, wherein one surfaces of the main body and the electrode terminals, which are opposite to end-face electrodes, are first surfaces, and the surface, which is opposite to the first surface, is a second surface; it is characterized in that the preparation method is characterized in that,

the electrode terminal extends from a predetermined edge of the main body in a direction orthogonal to a thickness direction of the main body, and has a bent portion and an extended portion, a first surface of the extended portion is suitable for welding and bonding with an end surface electrode, the bent portion is located between the extended portion and the main body, and the bent portion is configured to be bent and deformed from the predetermined edge of the main body in the thickness direction of the main body until the first surface of the extended portion is lower than the first surface of the main body.

2. The capacitor busbar according to claim 1, wherein the main body extends in a direction orthogonal to a thickness direction of the main body to form a transition portion, a first surface of the transition portion is flush with a first surface of the main body, a second surface of the transition portion is flush with a second surface of the main body, the transition portion is located between the bent portion and the main body, and a boundary between the transition portion and the bent portion is a predetermined edge of the main body.

3. The capacitor busbar according to claim 2, wherein the length of the transition part is greater than or equal to 0.5 mm.

4. The capacitor busbar according to claim 1, wherein the bent portion is formed with a first arc segment adjacent to the main body and a second arc segment adjacent to the extension portion.

5. The capacitor busbar according to claim 4, wherein the first circular arc segment is bent in a direction opposite to the second circular arc segment.

6. The capacitor busbar according to claim 5, wherein the first arc segment is bent toward the first surface, and the second arc segment is bent toward the second surface.

7. The capacitor busbar according to claim 1, wherein the bending angle of the bent portion is 30 ° to 90 °.

8. A capacitor, comprising a capacitor core and a capacitor bus bar, wherein the end face of the capacitor core is provided with an end face electrode, and the capacitor bus bar is the capacitor bus bar according to any one of claims 1 to 7.

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