Wide-temperature aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention belongs to the technical field of capacitors, and discloses a wide-temperature aluminum electrolytic capacitor and a preparation method thereof. According to the wide-temperature aluminum electrolytic capacitor, anode foil with the withstand voltage being 3.5-4.5 times of the working voltage and the thickness being 80 + / -10 mu and aluminum foil with the specific volume being 10 + / -0.5 mu F / cm < 2 > are adopted, 2-4 pairs of guide strips are adopted, the positions of the guide strips are evenly distributed, electrolytic paper with the density being 0.6 + / -0.5 is adopted, electrolyte serves as a cathode of the capacitor, and the electrolyte comprises 77-87 parts by weight of solvent and 20-25 parts by weight of main solute, and 2-10 parts of an additive. According to the capacitor, the ESR of the capacitor is reduced from the material and the structure, the high and low temperature characteristics of the capacitor are improved, the electrolyte is the cathode of the capacitor and can be used in the wide temperature range of-60 DEG C to 105 DEG C, and the electrolyte for the capacitor meets the conditions that (1) the high sparking voltage is larger than 100 V; 2) the conductivity is 50000 [mu] S / cm or above (40 DEG C); and 3) the pH value (40 DEG C) is 6.1 + / -0.5.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a wide temperature aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] The general temperature range of aluminum electrolytic capacitors is generally -40~+85℃, -25~+105℃, -40~+105℃, etc. Liquid aluminum electrolytic capacitors currently do not have capacitors with a low temperature of -60℃. However, with the development of electronic technology, higher requirements have been put forward for the working temperature range of aluminum electrolytic capacitors. For example, the bolt capacitor 16V4700 35*60 used in railway systems is required to be able to operate under the environment of -60~+105℃. normal work. [0003] Chinese patent application CN111653431A discloses an ultra-low temperature aluminum electrolytic capacitor and its manufacturing method. The manufacturing method includes the following steps: (1) core-wrap winding: the an...

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Problems solved by technology

In order to improve the conductivity, an appropriate amount of water will be added. It is necessary to solve the phenomenon that the saturated vapor pressure is relatively high at high temperature and the product is easy to bulge. At the same time, it is also necessary to solve the problem of aluminum hydroxide formed by water and aluminum and aluminum oxide film at high temperature. Problems: film thickness increases, capacity decreases, withstand voltage decreases, leakage current increases, and hydrogen gas is generated during the process of forming aluminum hydroxide, causing internal pressure to rise, shell drums and even explosion-proof valves to open, resulting in product failure

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