Aluminum capacitor welding process strip

Abstract

The utility model relates to the technical field of aluminum electrolytic capacitors, in particular to an aluminum capacitor welding process strip, which comprises a support strip provided with a welding area. The plurality of aluminum foils are sequentially welded on the welding area along the interval arrangement; wherein a positive and negative electrode isolation wire is formed at the set position of the aluminum foil, the aluminum foil is divided into a positive electrode layer and a negative electrode layer by the positive and negative electrode isolation wire, the positive electrode layer is arranged towards the side where the supporting strip is located, the negative electrode layer is arranged away from the side where the supporting strip is located, and a through hole is formed in the positive electrode layer. In this way, the problems that in the welding process of an existing laminated solid aluminum electrolytic capacitor, the welding conductivity is low, and liquid aluminum is extruded to flow out and crystallize are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum electrolytic capacitor technical field, specifically, relate to a kind of aluminum capacitor welding process strip. BACKGROUND

[0002] The existing laminated solid aluminum electrolytic capacitor adopts symmetrical lamination, that is, multiple layers of aluminum foil are stacked on both sides of the lead frame. During product processing of the capacitor, the aluminum foil after being cut by a cutter needs to be stacked on the lead frame, and the front and back surfaces are crossed. Silver paste is needed to bond the negative layer between the stacked sheets each time, and the positive layer needs to be welded by resistance welding or laser welding, so as to firmly weld the multiple foil sheets and the lead frame. Among them, the existing welding method melts the aluminum foil on the lead frame by contacting the product with the upper and lower electrodes to generate high temperature instantaneously. Since the surface of the aluminum foil has an insulating layer, the conductivity between the upper and lower electrodes is poor, which affects the welding. At the same time, the aluminum melts during welding, and the electrode extrudes the aluminum foil, causing liquid aluminum to flow out from the end of the aluminum foil and solidify into small particles when it cools down. Because the plastic encapsulation film is very thin, the solidified small particles of aluminum will affect the plastic encapsulation film after encapsulation, thereby affecting the performance of the product. SUMMARY

[0003] To solve the problems of low welding conductivity and liquid aluminum extrusion and crystallization during the welding process of the existing laminated solid aluminum electrolytic capacitor, the utility model provides an aluminum capacitor welding process strip.

[0004] In a first aspect, the utility model provides an aluminum capacitor welding process strip, which comprises:

[0005] A support strip is provided with a welding area;

[0006] A plurality of aluminum foils are sequentially welded onto the welding area in an interval arrangement;

[0007] Among them, the set position of the aluminum foil is formed with a positive and negative electrode isolation line, the positive and negative electrode isolation line separates the aluminum foil into a positive electrode layer and a negative electrode layer, the positive electrode layer is arranged towards the side where the support strip is located, the negative electrode layer is arranged away from the side where the support strip is located, and the positive electrode layer is formed with a perforation.

[0008] In some embodiments, the aluminum foil includes a welding portion and an action portion extending along one side of the welding portion, the aluminum foil is welded on the support strip through the welding portion, the action portion extends outward along one side of the welding area of the support strip, the positive and negative electrode isolation line is formed on the action portion and separates the action portion into the positive electrode layer and the negative electrode layer.

[0009] In some embodiments, the perforation has a plurality of perforations arranged in an interval arrangement in the positive electrode layer.

[0010] In some embodiments, the cross-sectional shape of the perforation is circular or elliptical or polygonal.

[0011] In some embodiments, if the cross-sectional shape of the perforation is polygonal, a chamfer is formed between two adjacent sides.

[0012] In some embodiments, the ratio i between the cross-sectional area of the perforation and the surface area of the positive electrode layer on the side where the perforation is located is 0.18≤i≤0.42.

[0013] In some embodiments, along the extension direction of the action part, the positive electrode layer is sequentially divided into a first region, a second region, and a fifth region, the fifth region is arranged towards the side where the positive-negative electrode isolation line is located, and the first region is arranged away from the side where the positive-negative electrode isolation line is located.

[0014] In some embodiments, the perforation is formed in the second region, or the third region, or between the second region and the third region.

[0015] To solve the problems of low welding conductivity and liquid aluminum extrusion out of crystallization in the welding process of the existing laminated solid aluminum electrolytic capacitor, the utility model has the following advantages:

[0016] Through the technical scheme of the utility model, the perforation is formed in the positive electrode layer of the aluminum foil of the process strip, so that when the aluminum foil positive electrode layer is welded subsequently, a layer of aluminum will be attached to the edge of the aluminum foil surface at the perforation, this layer of aluminum will connect the aluminum foil and the lead frame of the capacitor, so as to increase the welding conductivity; at the same time, the formed liquid aluminum will flow to the perforation to reduce or not overflow from the end of the aluminum foil to the lead frame of the capacitor, so that the plastic sealing material will not be broken during subsequent plastic sealing. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic view of an aluminum capacitor welding process strip is shown;

[0018] Figure 2 A structure schematic view of the dashed circle A shown in Figure 1 is shown.

[0019] Reference signs: 10-process strip; 11-supporting strip; 111-welding area; 12-aluminum foil; 121-welding part; 122-action part; 123-positive-negative electrode isolation line; 124-positive electrode layer; 125-negative electrode layer; 126-perforation. DETAILED DESCRIPTION

[0020] The present disclosure will now be discussed with reference to a number of exemplary embodiments. It is to be appreciated that these embodiments are discussed solely for the purpose of enabling those with ordinary skill in the art to better understand and therefore implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way.

[0021] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "includes, but is not limited to." The term "based on" is to be construed as "based at least in part on." The terms "a" and "an" are to be construed to cover "one or more." The term "another" is to be construed to cover "at least one." The terms "on," "under," "to," "into," "in," "onto," "along" and the like are not intended to mean "direct" or "moving" into contact with. The terms "above," "below," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," "longitudinal," and the like are used for description and do not connote or depend on any particular orientation or position. These terms are used primarily just to describe particular embodiments and the use of these terms is by no means intended to exclude from the scope of the application devices, elements or components that are determined to be the same as the described ones for reasons other than orientation or position. Moreover, the terms "front," "back," "top," "bottom," "over," "under," and the like in relation to one element can be used to describe the relative position of another element when the spatial orientation of such elements is changed. The specific meaning of these terms will depend on the specific embodiments and will be understood by those skilled in the art based on the context in which these terms are used. Furthermore, the terms "mount," "provide," "have," "set," "connect," "couple," "affix," and the like are to be construed broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection via an intermediate medium; or it can be an internal connection between two devices, elements or components. The specific meaning of these terms will depend on the specific embodiments and will be understood by those skilled in the art based on the context in which these terms are used. Furthermore, the terms "first," "second," and the like are used primarily to distinguish different elements or components from one another (the specific type and structure of which can or can not be the same), and are not intended to connote or imply relative importance or quantity. Unless otherwise stated, the meaning of "a plurality" is two or more.

[0022] The present embodiment discloses an aluminum capacitor welding process strip 10, as shown in Figure 1 As shown in Figure 2 The aluminum capacitor welding process strip 10 includes a support strip 11 and a plurality of aluminum foils 12, the support strip 11 is provided with a welding area 111;

[0023] The plurality of aluminum foils 12 are sequentially welded to the welding area 111 in a spaced arrangement;

[0024] The set position of the aluminum foil 12 is formed with a positive and negative electrode isolation line 123, the positive and negative electrode isolation line 123 separates the aluminum foil 12 into a positive electrode layer 124 and a negative electrode layer 125, the positive electrode layer 124 is arranged towards the side where the support strip 11 is located, the negative electrode layer 125 is arranged away from the side where the support strip 11 is located, and the positive electrode layer 124 is formed with a perforation 126.

[0025] In the embodiment, an aluminum capacitor welding process strip 10 is provided, by forming a perforation 126 in the positive electrode layer 124 of the aluminum foil 12 of the process strip 10, so that when the aluminum foil 12 positive electrode layer 124 is subsequently welded, a layer of aluminum will be attached to the edge of the surface of the aluminum foil 12 at the perforation 126, which will connect the aluminum foil 12 and the lead frame of the capacitor, so as to increase the welding conductivity; at the same time, the liquid aluminum formed will flow to the perforation 126, so as to reduce or not overflow from the end of the aluminum foil 12 to the lead frame of the capacitor, so that the plastic sealing material will not be broken during subsequent plastic sealing.

[0026] Specifically, the support strip 11 can be a steel strip, and a plurality of aluminum foils 12 can be sequentially welded on the welding area 111 of the support strip 11 by laser or electric welding, and after welding, glue can be applied on the set position of the aluminum foil 12 by a roller to form the positive and negative electrode isolation line 123. In the present application, the glue can be silicone or other, and the positive and negative electrode isolation line 123 is preferably arranged around the outer circumferential surface of the aluminum foil 12, which can better isolate the mutual interference between the positive and negative electrode layers 125, so as to improve the quality of the product.

[0027] Specifically, the perforation 126 can be cut in the area above the positive and negative electrode isolation line 123 of the aluminum foil 12 welded on the support strip 11 by a cutter or laser cutting. In the present application, laser processing is preferred, which aims to destroy the edge layer to form a new conductive path to solve the problem of poor welding, and secondly to solve the problem of overflow of aluminum after welding by resistance welding, which exceeds the size of the product and causes the appearance to be unqualified after plastic sealing, and even causes the plastic sealing mold to be damaged.

[0028] Specifically, by using chemical cleaning and drying, immersion polymerization, graphite immersion drying and silver paste immersion drying, the surface below the positive and negative electrode isolation line 123 of the aluminum foil 12 and the corrosion hole are formed with the negative electrode layer 125, and finally the aluminum capacitor welding process strip 10 is formed, so as to facilitate the subsequent processing of the process strip 10 to form a chip type laminated aluminum electrolytic capacitor.

[0029] In some embodiments, the aluminum foil 12 comprises a welding portion 121 and an acting portion 122 extending along one side of the welding portion 121, the aluminum foil 12 is welded on the support strip 11 through the welding portion 121, the acting portion 122 extends outward along one side of the welding area 111 of the support strip 11, the positive and negative isolation line 123 is formed on the acting portion 122 and separates the acting portion 122 into the positive electrode layer 124 and the negative electrode layer 125.

[0030] Further, the perforations 126 are multiple, and the multiple perforations 126 are arranged in a spaced arrangement on the positive electrode layer 124.

[0031] Further, the cross-sectional shape of the perforations 126 is circular or elliptical or polygonal.

[0032] Further, if the cross-sectional shape of the perforations 126 is polygonal, a chamfer is formed between two adjacent sides.

[0033] Further, the ratio i between the cross-sectional area of the perforations 126 and the surface area on the positive electrode layer 124 on the side where the perforations 126 are located is 0.18≤i≤0.42.

[0034] Further, along the extension direction of the acting portion 122, the positive electrode layer 124 is sequentially divided into a first region, a second region, and a fifth region, the fifth region is arranged towards the side where the positive and negative isolation line 123 is located, and the first region is arranged away from the side where the positive and negative isolation line 123 is located.

[0035] Among them, the perforations 126 are formed in the second region, or the third region, or between the second region and the third region.

[0036] In this embodiment, the cross-sectional shape of the perforations 126 is square or rectangular or rounded rectangular or elliptical or other shapes that can be realized in real time, and the ratio i between the cross-sectional area of the perforations 126 and the surface area on the positive electrode layer 124 on the side where the perforations 126 are located is preferably 0.18≤i≤0.42, so that when the positive electrode layer 124 of the aluminum foil 12 is subsequently welded, a layer of aluminum will be attached to the edge of the insulating layer at the perforations 126 on the surface of the aluminum foil 12, this layer of aluminum connects the aluminum foil 12 and the lead frame, increasing the welding conductivity; at the same time, the liquid aluminum formed will flow to the perforations 126, so as to reduce or not overflow from the end of the aluminum foil 12 to the lead frame, so that the plastic sealing material will not be broken during plastic sealing; furthermore, it can prevent the reduction of the action area of the positive electrode layer 124 of the aluminum foil 12 due to the too large cross-sectional area of the perforations 126, which affects the product performance of the laminated solid aluminum electrolytic capacitor.

[0037] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other embodiments without departing from the scope of the application. The embodiments are therefore to be seen as exemplary and in no way restrictive, the scope of the application being defined by the claims below rather than by the above description, and all variations falling within the meaning and range of equivalency of the essential characteristics of the claims are therefore intended to be embraced therein.

[0038] Furthermore, it should be understood that, although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. An aluminum capacitor welding process strip, characterized by, The application relates to a support strip, which is provided with a welding area; a plurality of aluminum foils are welded to the welding area in a spaced arrangement; wherein a positive-negative electrode isolation line is formed at a set position of the aluminum foils, the positive-negative electrode isolation line separates the aluminum foils into a positive electrode layer and a negative electrode layer, the positive electrode layer is arranged towards the side where the support strip is located, the negative electrode layer is arranged away from the side where the support strip is located, and the positive electrode layer is provided with perforations. The aluminum foil comprises a welding portion and an action portion extending along one side of the welding portion, the aluminum foil is welded to the support strip through the welding portion, the action portion extends outward along one side of the welding area of the support strip, the positive-negative electrode isolation line is formed on the action portion and separates the action portion into the positive electrode layer and the negative electrode layer. The perforations are arranged in a spaced arrangement in the positive electrode layer. The cross-sectional shape of the perforations is circular, oval or polygonal.

2. The aluminum capacitor welding process strip of claim 1, wherein, If the cross-sectional shape of the perforations is polygonal, a chamfer is formed between two adjacent sides.

3. The aluminum capacitor weld process strip of claim 2, wherein, The ratio i between the cross-sectional area of the perforations and the surface area of the positive electrode layer on the side where the perforations are located is 0.18<=i<=0.

42.

4. The aluminum capacitor welding process strip of claim 1 or 2 or 3, wherein, Along the extension direction of the action portion, the positive electrode layer is sequentially divided into a first region, a second region and a fifth region, the fifth region is arranged towards the side where the positive-negative electrode isolation line is located, and the first region is arranged away from the side where the positive-negative electrode isolation line is located.

5. The aluminum capacitor welding process strip of claim 4, wherein, The perforations are formed in the second region, the third region or between the second region and the third region.

6. The aluminum capacitor weld process strip of claim 2 wherein, ​ 7. The aluminum capacitor welding process strip of claim 2 wherein, ​ ​

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