Aluminum electrolytic capacitor with low short circuit rate

Abstract

The utility model provides a kind of low short-circuit rate aluminum electrolytic capacitor, including shell, cover plate and core package, and core package is sealed by cover plate and is arranged in shell;Core package includes anode foil, electrolytic paper and cathode foil, and anode foil, electrolytic paper and cathode foil are wound to form cylindrical core package;The cutting mouth of anode foil winding starting section is coated with adhesive;Adhesive wraps the cutting mouth of anode foil winding starting section;Anode foil includes laminated foil.In the utility model, anode foil uses laminated foil, which can minimize the volume of aluminum electrolytic capacitor as far as possible;Because the thickness of laminated foil is greater than that of traditional etching aluminum foil, burr condition will be more serious, in the utility model, by coating adhesive on the cutting mouth of anode foil winding starting section, burr wrapping of cutting mouth is realized, the influence brought by burr is reduced, so as to achieve the purpose of reducing short-circuit rate, prevent explosion in aging process.

Description

Technical Field

[0001] This utility model relates to an aluminum electrolytic capacitor, and more particularly to an aluminum electrolytic capacitor with a low short-circuit rate. Background Technology

[0002] With the development of modern industrial technology, aluminum electrolytic capacitors, as indispensable components in electronic devices, face increasingly stringent requirements for miniaturization. Currently, the mainstream solution involves using multilayer foil as the anode foil, which offers higher specific capacitance than traditional etched aluminum foil, thus enabling the miniaturization of aluminum electrolytic capacitors with the same capacity. However, during the winding process of multilayer foil, excessive burrs at the cut edges can easily occur, potentially leading to problems such as explosions during product aging.

[0003] Currently, patent CN206505835U discloses a staggered winding technology, which can alleviate the impact of excessive burrs to some extent, but cannot completely solve the problem. However, since the thickness of the laminated foil is thicker than that of the traditional etched aluminum foil, the burr situation will be more serious, and the effect of reducing the impact of burrs through staggered winding technology is relatively limited. Utility Model Content

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide an aluminum electrolytic capacitor with a low short-circuit rate.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: an aluminum electrolytic capacitor with low short-circuit rate, comprising a shell, a cover plate, and a core package, wherein the core package is sealed inside the shell by the cover plate; the core package comprises an anode foil, electrolytic paper, and a cathode foil, wherein the anode foil, electrolytic paper, and cathode foil are wound to form a cylindrical core package; an adhesive is applied to the cut end of the starting section of the anode foil winding; the adhesive wraps the cut end of the starting section of the anode foil winding; the anode foil comprises a multilayer foil.

[0006] In the aforementioned aluminum electrolytic capacitor with low short-circuit rate, preferably, the anode foil at the winding start end of the core package is wound before the cathode foil.

[0007] In the aforementioned aluminum electrolytic capacitor with low short-circuit rate, preferably, the anode foil at the starting end of the core winding is wound 1-5 mm before the cathode foil.

[0008] Preferably, in the aforementioned low short-circuit rate aluminum electrolytic capacitor, the width of the anode foil is greater than the width of the cathode foil, and the two side edges of the cathode foil are located inside the two side edges of the anode foil.

[0009] Preferably, in the aforementioned aluminum electrolytic capacitor with low short-circuit rate, the end of the core package is wound with at least one additional turn of cathode foil outside the anode foil.

[0010] Compared with the prior art, the advantages of this utility model are as follows: In this utility model, the anode foil is made of laminated foil, which can minimize the volume of the aluminum electrolytic capacitor; since the thickness of the laminated foil is greater than that of the traditional etched aluminum foil, the burr situation will be more serious. In this utility model, by applying an adhesive to the cut end of the anode foil winding starting section, the burrs at the cut end are wrapped, reducing the impact of the burrs, thereby reducing the short circuit rate and preventing explosion during the aging process. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the aluminum electrolytic capacitor with low short-circuit rate in Example 1.

[0012] Figure 2 This is a schematic diagram of the core package after it has been unfolded in Example 1.

[0013] Legend

[0014] 1. Outer shell; 2. Cover plate; 3. Core package; 31. Anode foil; 32. Cathode foil; 33. Electrolytic paper; 4. Anode conductive foil strip; 5. Cathode conductive foil strip; 6. Anode terminal; 7. Cathode terminal; 8. Adhesive. Detailed Implementation

[0015] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0016] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0017] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention. Example 1

[0018] like Figure 1 The illustrated low short-circuit rate horn-shaped aluminum electrolytic capacitor includes a casing 1, a cover plate 2, and a core 3, the core 3 being sealed within the casing 1 by the cover plate 2. Figure 1As shown, the core package 3 includes an anode foil 31, electrolytic paper 33, and a cathode foil 32. The anode foil 31, electrolytic paper 33, and cathode foil 32 are wound to form a cylindrical core package 3. An adhesive 8 is applied to the cut edge of the initial winding section of the anode foil 31. The adhesive 8 wraps around the cut edge of the initial winding section of the anode foil 31. In this embodiment, the anode foil 31 includes a laminated foil, and the cathode foil 32 is a conventional aluminum foil. In this embodiment, the adhesive 8 includes one or more of polyvinyl alcohol, polyethylene glycol, and polyglycerol ether.

[0019] In this embodiment, an anode guide foil 4 and a cathode guide foil 5 are riveted to the anode foil 31 and the cathode foil 32, respectively. The anode guide foil 4 and the cathode guide foil 5 are electrically connected to the anode terminal 6 and the cathode terminal 7 on the cover plate 2, respectively.

[0020] In this embodiment, the anode foil 31 at the starting winding end of the core package 3 is wound 1-5 mm before the cathode foil 32. Because the anode foil 31 is wound before the cathode foil 32, the cut at the starting winding section of the anode foil 31 is offset from that of the cathode foil 32, which can reduce the occurrence of short circuits to some extent. However, since the anode foil 31 of the aluminum electrolytic capacitor in this embodiment is a laminated foil, and the thickness of the laminated foil is greater than that of traditional etched aluminum foil, the burr situation will be more severe. Traditional micro-misalignment winding technology is not ideal for reducing short circuits due to burrs. In this embodiment, by wrapping the cut at the starting winding section of the anode foil 31 with adhesive 8, the burrs at the cut are covered, reducing the impact of burrs and thus achieving the purpose of reducing the short circuit rate.

[0021] In this embodiment, as Figure 2 As shown, the width of the anode foil 31 is greater than the width of the cathode foil 32, and the two side edges of the cathode foil 32 are located inside the two side edges of the anode foil 31. The width of the electrolytic paper 33 is greater than the width of the anode foil 31, and the two side edges of the anode foil are located inside the two side edges of the electrolytic paper 33. Because the two side edges of the cathode foil 32 are located inside the two side edges of the anode foil 31, even if the burrs on both sides of the anode foil 31 pierce the electrolytic paper 33, it will not easily be misconnected to the cathode foil 32 and cause a short circuit.

[0022] In this embodiment, at least one additional turn of cathode foil 32 is wound around the outer side of the anode foil 31 at the end of the core package 3. This is because the price of the anode foil 31 is much higher than that of the cathode foil 32. Therefore, at least one additional turn of cathode foil 32 is wound around the outer side of the anode foil 31 at the end of the core package 3, so that the outermost anode foil 31 is wrapped with cathode foil 32. At the end of the core package 3, after the cathode foil 32 is wound, one to three turns of electrolytic paper 33 are wound, and then it is fixed with transparent tape or glue.

[0023] In this embodiment, the anode foil 31 is made of laminated foil, which can minimize the volume of the aluminum electrolytic capacitor. Since the thickness of the laminated foil is greater than that of the traditional etched aluminum foil, the burrs will be more severe. In this invention, adhesive 8 is applied to the cut end of the starting section of the anode foil 31 to wrap the burrs at the cut end, thereby reducing the impact of the burrs and thus reducing the short circuit rate and preventing explosion during the aging process.

Claims

1. A low short-circuit rate aluminum electrolytic capacitor, comprising a casing, a cover plate, and a core, wherein the core is sealed within the casing by the cover plate; characterized in that: The core package includes an anode foil, electrolytic paper, and a cathode foil, which are wound to form a cylindrical core package; an adhesive is applied to the cut end of the starting section of the anode foil winding; the adhesive wraps the cut end of the starting section of the anode foil winding; the anode foil includes laminated foil.

2. The aluminum electrolytic capacitor with low short-circuit rate according to claim 1, characterized in that: The anode foil at the starting point of the core package is wound before the cathode foil.

3. The aluminum electrolytic capacitor with low short-circuit rate according to claim 2, characterized in that: The anode foil at the starting end of the core package is wound 1-5 mm before the cathode foil.

4. The aluminum electrolytic capacitor with low short-circuit rate according to claim 1, characterized in that: The width of the anode foil is greater than the width of the cathode foil, and the two side edges of the cathode foil are located inside the two side edges of the anode foil.

5. The aluminum electrolytic capacitor with low short-circuit rate according to claim 1, characterized in that: The end of the core package is wound with at least one more turn of cathode foil on the outside of the anode foil.

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