High-safety aluminum electrolytic capacitor

Abstract

The invention discloses a high-safety aluminum electrolytic capacitor which comprises an aluminum shell, a core package installed in the aluminum shell and a cover plate used for packaging the core package in the aluminum shell. Wherein the core package comprises a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer and a cathode aluminum foil layer which are sequentially arranged from inside to outside; an anode guide pin is riveted on the anode aluminum foil layer, and a cathode guide pin is riveted on the cathode aluminum foil layer; wherein an interlayer paper film is arranged at the position, riveted with the positive electrode guide pin, of the positive electrode aluminum foil layer and / or the position, riveted with the negative electrode guide pin, of the negative electrode aluminum foil layer; a packing paper layer is arranged at the bottom of the aluminum shell and is of a composite structure with a high-density dielectric layer and a low-density adsorption layer. The high-safety aluminum electrolytic capacitor provided by the invention can effectively prevent adverse factors of water molecules in the manufacturing process of the aluminum electrolytic capacitor, prevents a few positive electrodes from being wound, deviated and contacted with the aluminum shell to cause ignition and burning through of the aluminum shell or short circuit caused by direct short circuit of the aluminum shell, and improves the safety performance of the electrolytic capacitor.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic devices, and in particular relates to a high-safety aluminum electrolytic capacitor. Background Art

[0002] Among various capacitors, aluminum electrolytic capacitors are widely popular because they can achieve a larger CV value per unit area than other capacitors of the same size, can store more charge, and are cheaper.

[0003] In recent years, the application occasions of high voltage, large capacity and large ripple current leaded aluminum electrolytic capacitors have gradually increased, especially the large-scale use of 400-600V voltage range leaded plug-in high-safety aluminum electrolytic capacitors (large particle diameter: Φ16x30-Φ22x60mm, capacity range of 82UF-220UF), which has led to the increasingly widespread application of capacitors in this range.

[0004] However, this type of lead-type high-voltage aluminum electrolytic capacitor, especially the high-voltage 500V-600V aluminum electrolytic capacitor, for example, the 600V capacitor, has an electrolyte moisture content of less than 0.5%-3%. In the production process, the battery core will inevitably be exposed to the air. When exposed to the air, the desiccant properties of the electrolyte will adsorb water molecules in the air, change the local electrical parameter properties of the electrolyte, and easily cause a local short-board effect of the electrolyte flash voltage, which is a major factor leading to non-burr-type breakdown at the winding edge of the aluminum electrolytic capacitor; in addition, during the production process, the electrolyte is easily enriched at the edge of the core when the battery core is wound, and the enriched electrolyte is also likely to affect the performance of the capacitor; secondly, a small number of positive electrode windings deviate and contact the aluminum shell 10, which will also cause sparks to burn through the aluminum shell 10, resulting in a short circuit of the aluminum shell 10, and even a serious capacitor explosion.

[0005] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] An object of the present invention is to provide a high-safety aluminum electrolytic capacitor to solve at least one of the above-mentioned background technical problems.

[0007] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0008] A high-safety aluminum electrolytic capacitor comprises an aluminum shell, a core package installed in the aluminum shell, and a cover plate for encapsulating the core package in the aluminum shell; wherein the core package comprises a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer and a cathode aluminum foil layer arranged in sequence from the inside to the outside; a positive electrode guide pin is riveted on the anode aluminum foil layer, and a negative electrode guide pin is riveted on the cathode aluminum foil layer; wherein an interlayer paper film is provided at the position where the positive electrode guide pin is riveted on the anode aluminum foil layer and / or at the position where the negative electrode guide pin is riveted on the cathode aluminum foil layer; a pad paper layer is provided at the bottom of the aluminum shell, and the pad paper layer is a composite structure having a high-density dielectric layer and a low-density adsorption layer.

[0009] In some embodiments, the material of the backing paper layer is the same as the material of the interlayer paper film, and the composite density of the backing paper layer of the composite structure is 0.65 g / cm 3 -0.85g / cm 3 .

[0010] In some embodiments, the pad paper layer includes a first pad paper layer and a second pad paper layer; wherein the first pad paper layer is in contact with the core package, and the second pad paper layer is in contact with the bottom of the aluminum shell.

[0011] In some embodiments, the surface of the first pad paper layer is configured to be a rough surface.

[0012] In some embodiments, the surface of the first pad paper layer is provided with pores.

[0013] In some embodiments, the thickness of the pad paper layer is 0.1 mm-0.3 mm; the thickness of the electrolytic paper of the first electrolytic paper layer and the second electrolytic paper layer is 40 um-70 um.

[0014] In some embodiments, the upper surface and / or lower surface of the padding paper layer is a non-flat plane, and there is a gap between the lower surface of the padding paper layer and the bottom surface of the aluminum shell or there is a gap between the upper surface of the padding paper layer and the bottom of the core package.

[0015] In some embodiments, the pad paper layer is circular, the diameter of the pad paper layer is equal to the inner diameter of the aluminum shell, and the periphery of the pad paper layer is in close contact with the inner wall of the aluminum shell.

[0016] In some embodiments, the interlayer paper film is square, and the height of the interlayer paper film is less than or equal to the height of the anode aluminum foil layer and the cathode aluminum foil layer.

[0017] In some embodiments, the positive electrode guide pin includes a flat sheet-shaped riveted portion, and the height of the sheet-shaped riveted portion is smaller than the height of the interlayer paper film.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] Compared with the prior art, the high-safety aluminum electrolytic capacitor of the present invention can effectively prevent the adverse factors of water molecules in the aluminum electrolytic capacitor manufacturing process, prevent a small number of positive electrode windings from deviating and contacting the aluminum shell to cause ignition and burning through the aluminum shell or directly short-circuiting the aluminum shell to cause a short circuit, thereby improving the safety performance of the electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a three-dimensional schematic diagram of a high-safety aluminum electrolytic capacitor according to an embodiment of the present invention;

[0022] Figure 2 It is a partially exploded schematic diagram of a high-safety aluminum electrolytic capacitor according to an embodiment of the present invention;

[0023] Figure 3 It is a partially exploded schematic diagram of a high-safety aluminum electrolytic capacitor from another angle according to an embodiment of the present invention;

[0024] Figure 4 1 is a schematic diagram of a core package of a high-safety aluminum electrolytic capacitor according to an embodiment of the present invention;

[0025] Figure 5 is another schematic diagram of a core package of a high-safety aluminum electrolytic capacitor according to an embodiment of the present invention;

[0026] Figure 6 The present invention is a schematic diagram of the assembly of an interlayer paper film and a positive electrode guide pin of a high-safety aluminum electrolytic capacitor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention clearer and more understandable, and to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing or for circuit connection.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, unless otherwise clearly specified and defined, the meaning of "multiple" is two or more, and the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] Reference Figure 1-Figure 6 As shown, as an embodiment of the present invention, a high-safety aluminum electrolytic capacitor 100 is provided, comprising an aluminum shell 10, a core package 20 installed in the aluminum shell 10, and a cover plate 30 for encapsulating the core package 20 in the aluminum shell 10; wherein the core package 20 comprises a first electrolytic paper layer 203, an anode aluminum foil layer 204, a second electrolytic paper layer 205 and a cathode aluminum foil layer 206 arranged in sequence from the inside to the outside; a positive electrode guide pin 2010 is riveted on the anode aluminum foil layer 204, and a negative electrode guide pin 2011 is riveted on the cathode aluminum foil layer 206; wherein an interlayer paper film 202 is provided at the position where the positive electrode guide pin 2010 is riveted on the anode aluminum foil layer 204 and / or at the position where the negative electrode guide pin 2011 is riveted on the cathode aluminum foil layer 206; a pad paper layer 40 is provided at the bottom of the aluminum shell 10, and the pad paper layer 40 is a composite structure having a high-density dielectric layer and a low-density adsorption layer.

[0032] Reference Figure 4 , Figure 5 As shown, specifically, the first electrolytic paper layer 203 , the anode aluminum foil layer 204 riveted with the positive electrode guide needle 2010 , the second electrolytic paper layer 205 , and the cathode aluminum foil layer 206 riveted with the negative electrode guide needle 2011 are wound together to form the core package 20 .

[0033] In some embodiments, the material of the backing paper layer 40 is the same as the material of the interlayer paper film 202; in some embodiments, the composite density of the backing paper layer 40 of the composite structure is 0.65 g / cm 3 -0.85g / cm 3 .

[0034] By providing a padding paper layer 40 at the bottom of the aluminum shell 10, the electrolyte enriched at the edge of the core of the core package 20 after winding can be adsorbed, effectively preventing the damage and interference of water molecules in the process of the core package 20; in addition, the padding paper layer 40 can prevent a small number of positive electrode windings from deviating and contacting the aluminum shell 10 to cause sparks and burn through the aluminum shell 10, or directly short-circuit the aluminum shell 10.

[0035] Reference Figure 2 , Figure 3As shown, in some embodiments, the pad paper layer 40 is a thickened cotton and linen paper material using a composite mixed paper process of a round mesh process and a long mesh process. The pad paper layer 40 includes a first pad paper layer and a second pad paper layer, wherein the first pad paper layer contacts the core package 20 to absorb the electrolyte enriched at the edge of the core of the core package 20 after winding; the second pad paper layer contacts the bottom of the aluminum shell 10 to play an explosion-proof role; a gap is set between the first pad paper layer and the second pad paper layer, when the high-safety aluminum electrolytic capacitor bursts, the double-layer pad paper structure can buffer and prevent the splashing foam of the burst, and the first pad paper layer and the second pad paper layer can absorb the electrolyte when the capacitor bursts, avoiding the splashing of high-temperature and high-heat liquid when bursting, thereby improving the safety of the capacitor. In some embodiments, the thickness of the pad paper layer 40 is 0.1mm-0.3mm. Compared with other explosion-proof structures, the present invention uses the pad paper layer 40 to greatly reduce the thickness of the explosion-proof structure, and can increase the volume of the core package 20 within a limited volume range, thereby improving the performance of the capacitor. In some embodiments, the thickness of the first pad paper layer is greater than the thickness of the second pad paper layer, or the thickness of the first pad paper layer is equal to the thickness of the second pad paper layer. When the capacitor bursts, the first pad paper layer in contact with the core package 20 first blocks the burst splashes, and then the second pad paper layer is used for buffering and blocking, thereby improving the safety performance of the capacitor. In some embodiments, the surface of the first pad paper layer is set to a rough surface, and by setting it to a rough surface, the adsorption area is increased to facilitate the adsorption of the electrolyte enriched at the edge of the core of the core package 20 after winding. In some embodiments, the surface of the first pad paper layer is provided with pores, and the surface of the second pad paper layer is a smooth and flat surface.

[0036] In some embodiments, the second pad paper layer is configured to have a three-layer structure, including a paper film layer, a graphene layer and a polyethylene layer; wherein the graphene layer is disposed between the paper film layer and the polyethylene layer, the paper film layer is close to the first pad paper layer, and the polyethylene layer is in contact with the bottom of the aluminum shell 10; by such a configuration, through the adsorption of the paper film layer, the high strength of the graphene layer and the good elasticity of the polyethylene layer, when the capacitor core package 20 bursts, the second pad paper layer can play a good explosion-proof role.

[0037] In some embodiments, the thickness of the electrolytic paper of the first electrolytic paper layer and the second electrolytic paper layer is 40um-70um, and the electrolytic paper is a double-layer composite paper of a round screen or a double-layer composite paper of a round screen and a special screen. In some embodiments, the fiber structure of the electrolytic paper is a circular structure.

[0038] Reference Figure 2-Figure 5As shown, in some embodiments, the pad paper layer 40 is circular, and the diameter of the pad paper layer 40 is equal to the inner diameter of the aluminum shell 10, ensuring that the periphery of the pad paper layer 40 is in close contact with the inner wall of the aluminum shell 10. In some embodiments, the upper surface and / or lower surface of the pad paper layer 40 is a flat plane, the lower surface of the pad paper layer 40 is in full contact with the bottom surface of the aluminum shell 10, and the upper surface of the pad paper layer 40 is in full contact with the bottom of the core package 20; in some embodiments, the upper surface and / or lower surface of the pad paper layer 40 is a non-flat plane, and there is a gap between the lower surface of the pad paper layer 40 and the bottom surface of the aluminum shell 10 or there is a gap between the upper surface of the pad paper layer 40 and the bottom of the core package 20.

[0039] In some embodiments, the interlayer paper film 202 is a composite structure having a high-density dielectric layer and a low-density adsorption layer; in some embodiments, the composite density of the interlayer paper film 202 of the composite structure is 0.65 g / cm 3 -0.85g / cm 3 .

[0040] Reference Figure 5 , Figure 6 As shown, in some embodiments, the interlayer paper film 202 is square, and the height of the interlayer paper film 202 is less than or equal to the height of the anode aluminum foil layer 204 and the cathode aluminum foil layer 206; in some embodiments, the positive electrode guide needle 2010 has the same structure as the negative electrode guide needle 2011, and the positive electrode guide needle 2010 is used as an example for explanation; wherein, the positive electrode guide needle 2010 includes a flat sheet-like riveted portion 2012, and the height of the sheet-like riveted portion 2012 is less than the height of the interlayer paper film 202; the width of the sheet-like riveted portion 2012 is at least less than half the width of the interlayer paper film 202. By providing the interlayer paper film 202 at the position where the positive electrode guide pin 2010 is riveted on the anode aluminum foil layer 204 and / or at the position where the negative electrode guide pin 2011 is riveted on the cathode aluminum foil layer 206, the high-density dielectric layer is fractured during riveting to increase the current channel, reduce the local impedance, and avoid short circuits caused by local anti-riveting burrs piercing.

[0041] In some embodiments, the positive electrode guide needle 2010 and the negative electrode guide needle 2011 have different structures, the thickness of the negative electrode guide needle 2011 is 100uM-200uM, and the thickness of the negative electrode aluminum foil layer is 20uM-60uM. The surface of the positive electrode guide needle 2010 is polarized by high voltage, and the material of the positive electrode guide needle 2010 and the material of the anode aluminum foil are the same as 99.993% anode aluminum, and the low specific capacitance anode foil has a unit area capacity of 0.1uF / CM2-0.32uF / CM2, and a thickness of 70um-95um.

[0042] It is understandable that the above content is a further detailed description of the invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the invention is limited to these descriptions. For ordinary technicians in the technical field to which the invention belongs, without departing from the concept of the invention, they can also make several substitutions or modifications to the described embodiments, and these substitutions or modifications should be deemed to belong to the scope of protection of this patent. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0043] In this specification, the schematic representations of the above terms do not necessarily refer 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other. Although the embodiments and advantages of the invention have been described in detail, it should be understood that various changes, substitutions and modifications may be made herein without departing from the scope defined by the appended claims.

[0044] Furthermore, the scope of the invention is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, means, methods, and steps described in the specification. One of ordinary skill in the art will readily appreciate that the above disclosures, processes, machines, manufactures, compositions of matter, means, methods, or steps currently existing or to be developed that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the embodiments described herein may be utilized. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, means, methods, or steps within their scope.

Claims

1. A high-safety aluminum electrolytic capacitor, characterized by: It comprises an aluminum shell, a core package installed in the aluminum shell, and a cover plate for encapsulating the core package in the aluminum shell; wherein the core package comprises a first electrolytic paper layer, an anode aluminum foil layer, a second electrolytic paper layer and a cathode aluminum foil layer arranged in sequence from the inside to the outside; a positive electrode guide pin is riveted on the anode aluminum foil layer, and a negative electrode guide pin is riveted on the cathode aluminum foil layer; wherein an interlayer paper film is arranged at the position where the positive electrode guide pin is riveted on the anode aluminum foil layer and / or at the position where the negative electrode guide pin is riveted on the cathode aluminum foil layer; a pad paper layer is arranged at the bottom of the aluminum shell, and the pad paper layer is a composite structure having a high-density dielectric layer and a low-density adsorption layer.

2. The high-safety aluminum electrolytic capacitor according to claim 1, characterized in that: The material of the pad paper layer is the same as that of the interlayer paper film, and the composite density of the pad paper layer of the composite structure is 0.65g / cm 3 -0.85g / cm 3 .

3. The high-safety aluminum electrolytic capacitor according to claim 1, characterized in that: The pad paper layer includes a first pad paper layer and a second pad paper layer; wherein the first pad paper layer is in contact with the core package, and the second pad paper layer is in contact with the bottom of the aluminum shell.

4. The high-safety aluminum electrolytic capacitor according to claim 3, characterized in that: The surface of the first pad paper layer is configured to be a rough surface.

5. The high-safety aluminum electrolytic capacitor according to claim 3, characterized in that: The surface of the first pad paper layer is provided with pores.

6. The high safety aluminum electrolytic capacitor according to claim 1, characterized in that: The thickness of the pad paper layer is 0.1mm-0.3mm; the thickness of the electrolytic paper of the first electrolytic paper layer and the second electrolytic paper layer is 40um-70um.

7. The high safety aluminum electrolytic capacitor according to claim 1, characterized in that: The upper surface and / or lower surface of the pad paper layer is a non-flat plane, and there is a gap between the lower surface of the pad paper layer and the bottom surface of the aluminum shell or there is a gap between the upper surface of the pad paper layer and the bottom of the core package.

8. The high-safety aluminum electrolytic capacitor according to any one of claims 1 to 7, characterized in that: The pad paper layer is circular, the diameter of the pad paper layer is equal to the inner diameter of the aluminum shell, and the periphery of the pad paper layer is in close contact with the inner wall of the aluminum shell.

9. The high-safety aluminum electrolytic capacitor according to claim 8, characterized in that: The interlayer paper film is square, and the height of the interlayer paper film is less than or equal to the height of the anode aluminum foil layer and the cathode aluminum foil layer.

10. The high-safety aluminum electrolytic capacitor according to claim 9, characterized in that: The positive electrode guide pin includes a flat sheet-shaped riveted portion, and the height of the sheet-shaped riveted portion is smaller than the height of the interlayer paper film.

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