2244 results about "Aluminum electrolytic capacitor" patented technology

Implantable medical devices (IMDs) and components, including flat electrolytic capacitors and methods of making and using same, particularly an improved electrolytic capacitor fabricated of an electrode stack assembly comprising a plurality of capacitor layers stacked in registration upon one another. Each capacitor layer comprises a valve metal cathode layer having a cathode tab, a valve metal anode layer having an anode tab, and a separator layer located between the cathode layers. The anode layer is assembled from a plurality of valve metal anode sheets that are etched and anodized, stacked side-by-side, and electrically and mechanically joined together by laser weld beads. A valve metal anode tab having a thickness equal to one or more anode sheet is inserted into a tab notch in one or more stacked anode sheet and joined to the anode sheet stack by laser welding the tab and sheet edges together.

The present invention provides a separator that, when used in a lithium ion secondary battery, polymer lithium secondary battery, aluminum electrolytic capacitor or electric double-layer capacitor, offers desired levels of various practical characteristics, undergoes minimal heat shrinkage even when overheated, and exhibits high reliability and excellent workability. The electronic component separator proposed by the present invention comprises a porous base made of a substance having a melting point of 180° C. or above, and a resin structure provided on at least one side of and/or inside the porous base, and the porous base and/or resin structure contains filler grains.

The invention relates to a 600V extra-high voltage aluminum electrolyte capacitor working electrolyte and a preparation and an application thereof; the working electrolyte comprises the following materials: 44.5-80.3% of main solvent, 5-15% of auxiliary solvent, 8-15% of solute, 0.5-2.5% of sparking voltage enhancer, 6-10% of stabilizer and 0.2-3% of hydrogen absorbent; the preparation method comprises the following steps: mixing the main solvent and the auxiliary solvent evenly, heating the mixture to 60-90 DEG C; adding sparking voltage enhancer, heating the mixture to 135-155 DEG C; cooling the heated mixture to 65-80 DEG C by circulating water, adding the solute and the stabilizer, heating the product to 105-135 DEG C; finally, adding the hydrogen absorbent and natural cooling to obtain the working electrolyte. Proper sparking voltage enhancer and stabilizer are added in the electrolyte to improve the high voltage resistant and high temperature resistant properties of electrolyte and to ensure the electrolyte to have low aerogenesis property; the aluminum electrolyte capacitor prepared by using the electrolyte has long service life and high voltage resistant property, and can not be broken down as the sparking voltage of the electrolyte is unstable.

A capacitor element includes a positive electrode body made of valve metal, a dielectric oxide layer on the positive electrode body, a solid electrolytic layer made of conductive polymer on the dielectric oxide layer, and a negative electrode layer on the solid electrolytic layer. A solid electrolytic capacitor includes the capacitor element, a package made of insulating resin covering the capacitor element, a base electrode provided at an edge surface of the package and made of non-valve metal coupled with the positive electrode body, a diffusion layer for connecting the positive electrode body to the base electrode, an external electrode on the base electrode, and an external electrode connected to the negative electrode layer. The solid electrolytic capacitor reduces the number of components and processes to reduce its cost and to have a small size, and has a small equivalent series resistance and a small equivalent series inductance.

A solid electrolytic capacitor having at least two capacitor elements using a valve action metal, such as tantalum or niobium, and laminated in a direction perpendicular to a mounting surface of a substrate. The capacitor elements have a width parallel to the mounting surface of the substrate greater than a thickness perpendicular to the mounting surface of the substrate, and an anode terminal is connected with anode leads led out to at least one side of an anode body made of the valve action metal generally in parallel to the mounting surface of the substrate. A cathode layer on a dielectric oxide film of the anode body is connected to a cathode terminal and is coated with exterior coating resin with a part of the anode terminal and a part of the cathode terminal exposed.

An electrolytic capacitor includes a capacitor element, an electrolyte solution with which the capacitor element is impregnated, and an outer package enclosing the capacitor element and the electrolyte solution. The capacitor element includes an anode foil having a dielectric layer on a surface thereof, a cathode foil, a separator disposed between the anode foil and the cathode foil, and a solid electrolyte layer in contact with the dielectric layer of the anode foil and the cathode foil. The electrolyte solution contains a low-volatile solvent that is at least one of polyalkylene glycol and a derivative of polyalkylene glycol.

A solid electrolytic capacitor including a valve metal positive electrode, an anodized layer formed on a surface of the positive electrode, a conductive polymer-containing negative electrode conductive layer, and a coupling agent layer and a surface active agent layer placed between the anodized layer and the negative electrode conductive layer.

The invention relates to the production of electronic components, and discloses a method for forming anode foil for electrolytic capacitors. The ultrahigh-voltage anode foil is formed through six stages, wherein from the stage 1 to stage 5, each stage has a formation tank, and in the stage 6, three formation tanks are connected in parallel; and an acid fluid mixture containing a boric acid, a citric acid or an azelaic acid (the electric conductance and pH value thereof are adjusted by using carbon-containing inorganic salts) and ammonium hypophosphite or sodium monophosphate for improving the boiled performance of an oxidation film is filled in each formation tank. Correspondingly, the processing step is also adjusted, and the produced anode foil not only can be applied to the fields and industries of aerospace and automotive frequency converters and industrial frequency converters and the like meeting the ultrahigh voltage requirements on a withstand voltage of 700-1200V, but also is dense in oxidation film surface, high in specific volume and short in boosting time.

The invention provides an online monitoring method for a DC-link capacitor of a three-phase system. The method comprises that voltage of the DC-link capacitor is collected, and a voltage drop curve of the DC-link capacitor is obtained; three-phase output current is collected, and capacitive current is reconstructed according to the three-phase output current; and the capacitance (C) and equivalent serial resistance (ESR) of the DC-link capacitor are obtained according to the voltage drop curve and the capacitive current of the DC-link capacitor. The voltage drop curve and the three-phase output current of the DC-link capacitor as well as control signals of a semiconductor switch are monitored in the process that power equipment as a three-phase frequency converter is switched off, so that the C and ESR of the DC-link capacitor are calculated accurately, and non-invasive online monitoring for the DC-link capacitor of the AC/DC/AC system is realized. The method can be applied to online monitoring for an aluminum electrolytic capacitor, other capacitors as a film capacitor as well as other three-phase systems including a wind power converter, a photovoltaic AC/DC/AC system and a three-phase aviation power system.

The invention discloses a method for manufacturing a solid aluminum electrolytic capacitor. The manufacturing method comprises the step of impregnating a core by a monomer and an oxidant respectively after restoration and carbonizing treatment of the coiled core. The method is characterized in that the impregnated core is subjected to two-stage polymerization, namely, firstly low-temperature polymerization and then high-temperature polymerization, so that the polymerization of the monomer and the oxidant fully generates a stable conductive polymer layer; a solvent can be discharged out of the capacitor more efficiently so as to improve the electrical property of the capacitor; and voltages of 0.5, 1 and 1.2 times of a rated voltage are applied to a product in an ageing treatment process respectively to carry out stepwise ageing treatment so as to avoid damage of the core caused by overvoltage shock during disposable ageing, reduce ESR and leakage current LC and achieve the aim of improving the electrical property.

The invention provides a working electrolyte for a flame-retardant wide-temperature high-voltage aluminum electrolytic capacitor, which comprises the following components in percentage by weight: 45-80% of main solvent, 0.1-5% of oxidation film stabilizer, 5-15% of secondary solvent, 0.2-3% of hydrogen absorption agent, 5-10% of solute, 5-15% of flame retardant and 5-15% of spark voltage increasing agent. The invention also provides a preparation method of the electrolyte and application of the electrolyte in preparation of a high-voltage electrolytic capacitor. In the electrolyte, appropriate solvent combination is adopted, thus the wide temperature from -40 DEG C to 105 DEG C is realized; a composite solute of an organic carboxylate with a branched chain and a straight-chain carboxylate with a long carbon chain is adopted, thus the stability is ensured, and the cost is controlled; the appropriate spark voltage increasing agent, oxidation film stabilizer and hydrogen absorption agent are added, thus the spark voltage of the electrolyte is increased, and the characteristic parameters of the aluminum electrolytic capacitor are not deteriorated after the aluminum electrolytic capacitor is used for a long time; and the flame retardant is added, thus the aluminum electrolytic capacitor is difficult to burn after striking fire.

The invention discloses working electrolyte of a 650V-700V extra-high-voltage aluminum electrolytic capacitor. The working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor comprises, by weight, 45-65% of primary solvents, 5-20.5% of secondary solvents, 10-20% of solutes, 8-25% of spark voltage improvers, 5-10% of stabilizers, 0.2-3% of hydrogen absorbents, and 2-5% of other additives. The invention further discloses a preparation method of the working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor and the 650V-700V extra-high-voltage aluminum electrolytic capacitor. According to the 650V-700V extra-high-voltage aluminum electrolytic capacitor, the working electrolyte and the preparation method of the working electrolyte, the spark voltage improvers and the stabilizers within the reasonable ranges are used, the high-voltage resistance and high-temperature resistance of the electrolyte are improved, and meanwhile the working electrolyte has low gas production performance. When the aluminum electrolytic capacitor with the electrolyte is subjected to a ripple current life test at 85 DEG C for 2000 hours, the aluminum electrolytic capacitor can resist the voltage of 650-700V and even higher voltage, and a breakdown phenomenon caused by unstable spark voltage of the electrolyte is avoided.

In an electrolytic capacitor of the present invention, a dielectric layer is provided on a surface of a valve metal element for an anode having a capacitor forming part and an electrode lead part, and further, a solid electrolyte layer and a charge collecting layer for a cathode are provided in this order thereon. The capacitor forming part and the electrode lead part of the valve metal element for an anode have rough surface layers on their surfaces, and are compressed in the thickness direction of the rough surface layers. Further, a region other than the electrode lead part and the charge collecting element for cathode is molded with a molding material. Exposed portions of the electrode lead part and the charge collecting element for cathode function as electrode terminals, respectively.

The invention provides a method of manufacturing a porous anode for a solid electrolytic capacitor, comprising a step of subjecting a molded body containing powder of at least one material selected from oxygen-containing niobium material and oxygen-containing tantalum material and a pore-forming agent which is solid at reduction temperature to reduction reaction using reducing agent and another step of removing the pore-forming agent from the reduction reaction product and a solid electrolytic capacitor using an anode obtained thereby. As niobium material and tantalum material, at least one material selected from niobium, niobium alloy, niobium compound, tantalum, tantalum alloy and tantalum compound is used respectively. In the invention, the peak position, the number and quantity of pores can be optimized according to the cathode agent used, whereby a solid electrolytic capacitor having an improved property for impregnation with cathode agent, high capacitance, low ESR, good tan δ characteristics and long-term reliability, is obtained.