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A technology of aluminum electrolytic capacitors and capacitors, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problems of no high-voltage anode foil and cannot meet the needs of high-voltage capacitor production, and achieve the effect of eliminating technical hidden dangers and preventing breakdown
Inactive Publication Date: 2015-06-03
深圳市凯琦佳科技股份有限公司
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Problems solved by technology
[0006] However, the rated voltage of ordinary medium and high-voltage aluminum electrolytic capacitors generally does not exceed 630V. The main reason is that there is no supporting electrolyte and corresponding high-voltage anode foil, which cannot meet the current needs of high-voltage capacitor production.
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Embodiment 1
[0051] According to the usual production process, the capacitor is manufactured with a working voltage of 700V and a capacity of 6800uF. The special feature is that the anode foil is selected as the anode foil with a formation voltage of 950Vf. The composition of the electrolyte is as follows: (mass percentage, the same below):
[0052] Diethylene glycol 63%, 14% carboxylate ammonium salt described in the above (1) formula, ammonium pentaborate 10%, mannitol 12%, monobutyl phosphate 1%. The conductivity at 25°C is 0.4s / m, and its pH value at 25°C is 5.8.
Embodiment 2
[0054] This embodiment is basically the same as Embodiment 1, the difference being that the anode foil is selected as an anode foil with a formation voltage of 980Vf, and its electrolyte composition is as follows: (mass percentage, the same below):
[0055] Ethylene glycol 65%, 15% carboxylate ammonium salt described in the above (2) formula, ammonium pentaborate 8.5%, mannitol 10%, monobutyl phosphate 0.2%, nitroformic acid 1%, ammonium hypophosphite 0.3%. The conductivity at 25°C is 0.4s / m, and the pH value at 25°C is 7.2.
Embodiment 3
[0057] This embodiment is basically the same as Embodiment 1, the difference being that the anode foil is selected as an anode foil with a formation voltage of 1000Vf, and its electrolyte composition is as follows: (mass percentage, the same below):
[0058] Diethylene glycol butyl ether 75%, 8% carboxylate ammonium salt described in the above (3) formula, ammonium pentaborate 5%, mannitol 10.5%, monobutyl phosphate 0.5%, nitroformic acid 0.5%, ammonium hypophosphite 0.5% %. The conductivity at 25°C is 0.2 s / m, and its pH value at 25°C is 7.8.
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Abstract
The invention discloses a high-voltage aluminium electrolysis capacitor. The high-voltage aluminium electrolysis capacitor comprises a capacitor element, an electrolyte contained in the capacitor element, and an outer package which seals both the capacitor element and the electrolyte, wherein the capacitor element comprises an anode foil provided with an dielectric layer on the surface thereof, a cathode foil, and a diaphragm arranged between the anode foil and the cathode foil; the formation voltage of the anode foil is 950-1200vf; the electrolyte comprises the following components in percentage by weight: 63-75% of ethylene glycol or polyhydric alcohols, 4-15% of 24-50 carbon atom branched-chain binary or tricarboxylic acid ammonium salt, 1-10% of ammonium pentaborate, 1-12% of mannitol, and 0.2-1% of butyl phosphate; the conductivity of the electrolyte at 25 degrees centigrade is 0.1-0.4ms and the pH (potential of hydrogen) at 25 degrees centigrade is 5.8-7.8. As the formation voltage of the anode foil is 950-1200Vf and the electrolyte has very high flash fire voltage which can reach more than 700V, the capacitor has the working voltage of 700V, and the capacitor is effectively prevented from breakdown.
Description
technical field [0001] The invention relates to an electrolytic capacitor, in particular to a high-voltage aluminum electrolytic capacitor. Background technique [0002] Among aluminum electrolytic capacitors, shapes such as wound type and laminated type are widely used. This aluminum electrolytic capacitor has a structure in which the following are housed in a sealed case: an anode composed of aluminum foil having an aluminum oxide film on the surface, The cathode, and the spacer (Separator) that is arranged between the anode and the cathode and holds the electrolyte. [0003] The electrolytic solution for electrolytic capacitors is in direct contact with the dielectric layer as described above, and functions as a true cathode. That is, the electrolyte is interposed between the dielectric of the electrolytic capacitor and the current-collecting cathode, and the resistance component of the electrolyte is inserted in series into the electrolytic capacitor. Therefore, the ch...
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