Solid aluminum electrolytic capacitor

Abstract

The utility model provides a solid aluminum electrolytic capacitor, which relates to the field of capacitors and comprises a capacitor shell, a capacitor core, a sealing layer and an isolating layer, the capacitor core is arranged inside the capacitor shell and is sealed by the sealing layer and the capacitor shell, and the isolating layer is arranged between the capacitor core and the sealing layer. The utility model provides a sealing mode suitable for a solid aluminum capacitor product, the mode is different from the traditional girdling and hemming assembly process, no stress is generated to the riveting part of the capacitor core, and the reliability of the manufactured product is good.

Description

Technical Field

[0001] The utility model relates to the field of capacitors, and in particular to a solid aluminum electrolytic capacitor. Background Art

[0002] Solid aluminum electrolytic capacitor (Conductive polymeraluminum solid electrolytic capacitor) is the abbreviation of conductive polymer solid aluminum electrolytic capacitor, which is one of the most advanced products among capacitor products. The biggest difference from ordinary liquid electrolytic capacitors is that solid capacitors use completely different dielectric materials—conductive polymer materials. Under high temperature, the expansion and activity of this solid polymer dielectric particles are lower than that of liquid electrolytes, and the boiling point is as high as 350 degrees Celsius, so there is almost no risk of explosion. In theory, since solid capacitors "have no pulp to explode", it is almost impossible for them to explode.

[0003] The inventors have found that the prior art will generate stress on the riveted parts of the capacitor core during the sealing process (assembly through waist crimping). Since the cathode material used in solid aluminum capacitors is a solid conductive polymer material, it has poor mechanical properties, low hardness, and poor wear resistance. The stress applied to the riveted parts can easily cause defects in the oxide film and the polymer layer, affecting the performance and reliability of the product. Utility Model Content

[0004] The utility model aims to provide a solid aluminum electrolytic capacitor, which has a sealing method suitable for solid aluminum capacitor products. The method is different from the traditional waist crimping assembly process, does not generate stress on the riveting part of the capacitor core, and the manufactured product has good reliability.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a solid aluminum electrolytic capacitor, comprising a capacitor housing, a capacitor core, a sealing layer and an isolation layer, wherein the capacitor core is arranged inside the capacitor housing and is sealed by the sealing layer and the capacitor housing, and the isolation layer is arranged between the capacitor core and the sealing layer.

[0007] In an optional embodiment, the isolation layer may be made of polytetrafluoroethylene sheets of different thicknesses, high-temperature tapes, raw tapes, or protective adhesives, and the material of the protective adhesive includes silicone or resin.

[0008] In an optional embodiment, the solid aluminum electrolytic capacitor further includes at least one pair of lead wires, and the at least one pair of lead wires passes through the sealing layer and the isolation layer to connect the capacitor core.

[0009] In an optional embodiment, the material of the lead wire includes aluminum, aluminum alloy, copper, etc.

[0010] In an optional implementation, the sealing layer is made of insulating resin or silicone material.

[0011] In an optional embodiment, the capacitor housing may be made of stainless steel, plastic, or aluminum alloy.

[0012] In an optional embodiment, when the capacitor casing is made of metal, an insulating layer is sprayed on the casing or insulated by an outer sleeve.

[0013] In an optional embodiment, a logo is printed on the capacitor housing or the bushing.

[0014] The beneficial effects of the embodiments of the utility model are:

[0015] The utility model provides a solid aluminum electrolytic capacitor, including a capacitor shell, a capacitor core, a sealing layer and an isolation layer. The capacitor core is arranged inside the capacitor shell and is sealed by the sealing layer and the capacitor shell. The isolation layer is arranged between the capacitor core and the sealing layer. The utility model has a sealing method suitable for solid aluminum capacitor products, because the cathode material of the solid aluminum product is a solid conductive polymer, unlike the liquid electrolyte, there will be leakage problems, and the traditional assembly method can be used for sealing; in addition, the traditional assembly method will apply stress to the capacitor core through waisting and curling sealing products. This stress is easy to cause defects in the oxide film and polymer layer of the capacitor core, which directly affects the performance and reliability of the product. The utility model abandons the traditional waisting and curling assembly process, and performs injection sealing on the capacitor core through the sealing layer. This method will not generate stress on the riveting part of the capacitor core, and the manufactured product has good reliability. At the same time, an isolation layer is arranged between the sealing layer and the capacitor core to prevent the material used in the sealing layer from damaging and contaminating the capacitor core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a solid aluminum electrolytic capacitor provided in the first embodiment of the utility model;

[0018] Figure 2This is a schematic diagram of a solid aluminum electrolytic capacitor provided in the second embodiment of the utility model.

[0019] icon:

[0020] 100-capacitor housing; 200-capacitor core; 300-sealing layer; 400-isolating layer; 500-lead wire. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Existing solid aluminum electrolytic capacitors are mainly sealed in two ways. 1. The lead-type solid aluminum capacitor leads out the positive and negative electrodes through positive and negative guide pins, and then mechanically waists and curls the edges with the matching size of the colloid and the shell; 2. The cover-type solid aluminum capacitor leads out the positive and negative electrodes through soft leads, and then rivets the soft leads to the corresponding cover, and waists and curls the edges with the matching size of the aluminum shell; these two existing technologies cannot achieve the production and preparation of large-capacity solid aluminum electrolytic capacitors, because the use of colloid and cover takes up a certain space, resulting in limited product capacity; secondly, due to the limited shape and size of the colloid and cover, the appearance and size of the product are also limited, and the product capacity volume utilization rate is low; in addition, the existing technology will generate stress on the capacitor core 200 during the sealing process, which is easy to cause defects in the oxide film and polymer layer of the capacitor core 200. Therefore, in order to solve the above problems, this embodiment provides a solid aluminum electrolytic capacitor.

[0028] First embodiment

[0029] like Figure 1 As shown, a solid aluminum electrolytic capacitor provided in this embodiment includes a capacitor housing 100, a capacitor core 200, a sealing layer 300 and an isolation layer 400. The capacitor core 200 is arranged inside the capacitor housing 100 and is sealed by the sealing layer 300 and the capacitor housing 100. The isolation layer 400 is arranged between the capacitor core 200 and the sealing layer 300. In detail, the sealing layer 300 in this embodiment can be sealed by pouring, so the production method is not limited by the shape and size of standard parts (guide pins, aluminum shells, rubber particles, etc.), and then the product shape (square, round, oval) and size are flexible and changeable, which improves the capacity volume utilization rate of the product. In addition, in this embodiment, a capacitor core 200 is arranged inside the capacitor housing 100, and in other embodiments, the number of capacitor cores 200 is not limited, depending on the actual situation.

[0030] It can be understood that the present embodiment has a sealing method suitable for solid aluminum capacitor products. The cathode material of the solid aluminum product is a solid conductive polymer. Unlike liquid electrolyte, there is no leakage problem, and the traditional assembly method can be used for sealing. In addition, the traditional assembly method will apply stress to the capacitor core 200 through waisting and curling sealing products. This stress can easily cause defects in the oxide film and polymer layer of the capacitor core 200, which directly affects the performance and reliability of the product. The present embodiment abandons the traditional waisting and curling assembly process, and the capacitor core 200 is injected and sealed through the sealing layer 300. This method will not generate stress on the riveted parts of the capacitor core 200, and the manufactured product has good reliability. At the same time, an isolation layer 400 is provided between the sealing layer 300 and the capacitor core 200 to prevent the material used in the sealing layer 300 from damaging and contaminating the capacitor core 200 body.

[0031] Specifically, the isolation layer 400 in this embodiment is made of high temperature tape or raw tape or protective glue. The material of the protective glue includes silicone or resin, and it mainly plays the role of protecting the capacitor core 200 and the isolation sealing layer 300.

[0032] Furthermore, the capacitor core 200 is soaked in protective glue or wrapped with adhesive tape. It is understandable that the protective glue and adhesive tape are actually a kind of protective measures for the capacitor core 200 to prevent the capacitor core 200 from directly contacting the sealing layer 300. The protective glue can be poured and filled after the capacitor core 200 is placed in the capacitor housing 100, or it can be processed before the capacitor core 200 is placed in the capacitor housing 100, such as soaking the capacitor core 200 in the protective glue liquid, and then taking out the capacitor core 200 and waiting for the protective glue to solidify, a layer of protective glue will be formed on its surface. In addition, the protective measures for the capacitor core 200 are not limited to the protective glue. In other embodiments, the protective measures for the capacitor core 200 can also be to wrap the tape around the capacitor core 200. Any material that contacts the capacitor core 200 and does not produce adverse reactions can be used as a protective measure for the capacitor core 200.

[0033] Specifically, the protective glue is mostly made of silicone. In detail, the protective glue in this embodiment is also called capacitor silicone, which is a silicone adhesive with flame retardant fixing effect. The curing method is the same as that of ordinary silicone. The elastomer formed after curing has excellent electrical properties, vibration resistance, aging resistance, high and low temperature resistance, insulation, moisture resistance and moisture resistance. It is commonly used for insulating bonding and fixing of speakers, coils, terminals, capacitors, resistors, inductors, glass, ceramics, metals and other parts. Therefore, this embodiment selects capacitor silicone as the protective glue.

[0034] It is worth noting that the protective glue used in this embodiment is not necessarily capacitor silicone. Any material that can achieve a flame retardant and fixing effect can be used as the protective glue of this embodiment and is within the protection scope of this embodiment.

[0035] Furthermore, the solid aluminum electrolytic capacitor further includes at least one pair of lead wires 500, and at least one pair of lead wires 500 passes through the sealing layer 300 and the isolation layer 400 to connect the capacitor core 200. In detail, in this embodiment, the lead end form of the lead wire 500 (whether a foil guide strip or a guide needle or other) and the number of the lead wires 500 (not limited to one pair of lead wires, multiple pairs or any number of positive and negative electrodes can be led) are not limited and can be adjusted according to requirements.

[0036] Specifically, the lead wire 500 is made of aluminum, aluminum alloy or copper.

[0037] Furthermore, the sealing layer 300 is made of insulating resin or silicone. It is understandable that the sealing layer 300 of this embodiment is made of insulating resin or silicone because, in addition to having good physical and mechanical properties, there should not be a large amount of freely movable charges in the insulating resin or silicone, that is, it has good electrical insulation performance. This performance is usually comprehensively measured by the size of the values ​​of volume insulation resistance, breakdown voltage, dielectric constant, power factor, corona, etc.

[0038] Specifically, the capacitor housing 100 can be made of stainless steel, plastic or aluminum alloy. Specifically, the advantages of the stainless steel capacitor housing 100 are high mechanical properties, not easy to deform, crack, not easy to rust and corrode, and long service life. The advantages of the plastic capacitor housing 100 are corrosion resistance, high plasticity and light weight. The advantages of the aluminum alloy capacitor housing 100 are corrosion resistance, easy processing, light weight, easy transportation, and excellent heat dissipation. The specific material to be selected depends on the situation.

[0039] In addition, when the capacitor housing 100 is made of metal, an insulating layer is sprayed on the housing or insulated by an outer sleeve; in addition, a logo is printed on the capacitor housing 100 or the sleeve outside the capacitor housing 100.

[0040] The solid aluminum electrolytic capacitor provided in this embodiment has the following advantages:

[0041] This embodiment is a sealing method suitable for solid aluminum capacitor products. Since the cathode material of the solid aluminum product is a solid conductive polymer, unlike liquid electrolyte, there is no leakage problem, and the traditional assembly method can be used for sealing. In addition, the traditional assembly method will apply stress to the capacitor core 200 through waisting and curling sealing products. This stress can easily cause defects in the oxide film and polymer layer of the capacitor core, which directly affects the performance and reliability of the product. The utility model abandons the traditional waisting and curling assembly process, and the capacitor core 200 is injected and sealed through the sealing layer 300, which will not generate stress on the riveted parts of the capacitor core 200. The manufactured product has good reliability. At the same time, an isolation layer 400 is provided between the sealing layer 300 and the capacitor core 200 to prevent the material used in the sealing layer 300 from damaging and contaminating the capacitor core 200 body.

[0042] Second embodiment

[0043] like Figure 2 As shown, the isolation layer 400 in this embodiment can be made of isolation material polytetrafluoroethylene sheets with different thicknesses. It can be understood that the polytetrafluoroethylene sheet is a non-metallic gasket.

[0044] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A solid aluminum electrolytic capacitor, characterized in that: The invention comprises a capacitor case, a capacitor core, a sealing layer and an isolation layer. The capacitor core is arranged inside the capacitor case and is sealed by the sealing layer and the capacitor case. The isolation layer is arranged between the capacitor core and the sealing layer.

2. A solid aluminum electrolytic capacitor according to claim 1, characterized in that: The isolation layer may be made of polytetrafluoroethylene sheets of different thicknesses, high-temperature tapes, raw tapes, or protective adhesives, and the material of the protective adhesive includes silica gel or resin.

3. A solid aluminum electrolytic capacitor according to claim 1, characterized in that: The solid aluminum electrolytic capacitor further includes at least one pair of lead wires, and the at least one pair of lead wires passes through the sealing layer and the isolation layer to connect the capacitor core.

4. A solid aluminum electrolytic capacitor according to claim 1, characterized in that: The sealing layer is made of insulating resin or silicone material.

5. A solid aluminum electrolytic capacitor according to claim 1, characterized in that: The capacitor housing can be made of stainless steel, plastic or aluminum alloy.

6. A solid aluminum electrolytic capacitor according to claim 1, characterized in that: When the capacitor shell is made of metal, an insulating layer is sprayed on the shell or insulated by an outer sleeve.

7. A solid aluminum electrolytic capacitor according to claim 6, characterized in that: A logo is printed on the capacitor shell or the sleeve.

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