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Aluminum electrolytic capacitor electrolyte solution and a preparation method thereof and aluminum electrolytic capacitor

An aluminum electrolytic capacitor and electrolyte technology, applied in the field of electrolyte, can solve the problems of large surface tension, increased cost, core heating, etc., to avoid the increase of internal pressure at high temperature, improve the decrease of electrical conductivity, and widen the use temperature Effect

Active Publication Date: 2019-01-11
深圳市智胜新电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte mainly includes solute and solvent, among which the solvent is the main factor affecting the working temperature of the electrolyte. Most of the existing solvents are ethylene glycol systems. Generally, dimethylformamide is added as an auxiliary solvent in the early stage, which can significantly reduce the electrolysis temperature. The viscosity of the liquid and increase the conductivity of the electrolyte, however, the vapor pressure of dimethylformamide increases under high temperature conditions, causing early failure of the capacitor
In addition, γ-butyrolactone, diethylene glycol methyl ether, etc. can also be added as auxiliary solvents to improve the performance of capacitors at high temperatures. However, γ-butyrolactone, diethylene glycol methyl ether, etc. will cause electrolyte The conductivity of the electrolyte is severely reduced, the loss becomes larger, and the core heats up and fails early, so the use of branched chain electrolytes as solutes increases the cost
On the other hand, the surface tension of the existing electrolyte is relatively high, resulting in a slow impregnation rate of the core, which increases production costs and waste of resources

Method used

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  • Aluminum electrolytic capacitor electrolyte solution and a preparation method thereof and aluminum electrolytic capacitor
  • Aluminum electrolytic capacitor electrolyte solution and a preparation method thereof and aluminum electrolytic capacitor

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preparation example Construction

[0037] The present invention also provides a method for preparing an electrolyte for an aluminum electrolytic capacitor. In an embodiment of the method for preparing an electrolyte for an aluminum electrolytic capacitor of the present invention, the preparation method includes the following steps:

[0038] Provide 40-70 parts of main solvent, 10-30 parts of auxiliary solvent, 5-20 parts of solute, and 1-10 parts of additives, wherein the auxiliary solvent contains polyhydric alcohols or polyhydric alcohol derivatives;

[0039] Mix the main solvent and the auxiliary solvent, heat to 40-80°C, add the solute, stir and mix to obtain a mixed solution;

[0040] Continue to heat the mixed solution to 105-115°C, keep it for 60-90 minutes, add the additives, stir and mix, and cool to room temperature to obtain the electrolytic solution of the aluminum electrolytic capacitor.

[0041] In this embodiment, the main solvent and auxiliary solvent are heated to 40-80°C, and then the solute is added. ...

Embodiment 1

[0054] In parts by weight, the formula of aluminum electrolytic capacitor electrolyte is:

[0055] Main solvent: ethylene glycol, 65 parts;

[0056] Auxiliary solvent: 3-methylpentanediol, 20 parts;

[0057] Solute: ammonium sebacate, 1.5 parts; ammonium hydrogen azelate, 1 part; ammonium benzoate, 1 part; branched chain polycarboxylic acid ammonium salt, 10.8 parts;

[0058] Additives: modified polyvinyl alcohol borate, 5 parts; p-nitroanisole, 0.5 parts; ammonium hypophosphite, 0.2 parts.

[0059] Under the condition of air humidity lower than 60%, the electrolytic solution of aluminum electrolytic capacitor is prepared, and the preparation method includes the following steps:

[0060] First, mix 85% of the main solvent and auxiliary solvent and heat to 40°C, add 20% of the solute, stir and dissolve thoroughly to obtain the first mixed solution, continue to heat to 135°C, and keep for 30 minutes;

[0061] Then, the temperature is lowered to 105°C, the remaining solute is added, and the ...

Embodiment 2

[0065] In parts by weight, the formula of aluminum electrolytic capacitor electrolyte is:

[0066] Main solvent: ethylene glycol, 65 parts;

[0067] Auxiliary solvent: 2-methyl 2.4 pentanediol, 15 parts;

[0068] Solute: ammonium sebacate, 1.5 parts; ammonium dodecanedioate, 0.5 parts; ammonium benzoate, 1 part; branched chain polycarboxylic acid ammonium salt, 11.8 parts;

[0069] Additives: polyethylene glycol, 5 parts; p-nitrobenzyl alcohol, 0.5 parts; ammonium hypophosphite, 0.2 parts.

[0070] Under the condition of air humidity lower than 60%, the electrolytic solution of aluminum electrolytic capacitor is prepared, and the preparation method includes the following steps:

[0071] First, mix 85% of the main solvent and auxiliary solvent and heat to 60°C, add 15% of the solute, stir and dissolve thoroughly to obtain the first mixed solution, continue to heat to 140°C, and keep it for 40 minutes;

[0072] Then, the temperature is lowered to 105°C, the remaining solute is added, and th...

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Abstract

The invention discloses an aluminum electrolytic capacitor electrolyte solution and a preparation method thereof, and an aluminum electrolytic capacitor using the aluminum electrolytic capacitor electrolyte solution, wherein, the aluminum electrolytic capacitor electrolyte solution comprises a main solvent, 40-70; auxiliary solvent, 10-30 part; Solute, 5-20 part; and additives, 1-10 part; Whereinthe main solvent is an alcohol solvent and the auxiliary solvent contains a polyhydroxy alcohol substance. The technical proposal of the invention can overcome the shortcomings existing in the existing electrolyte, effectively broaden the use range of the electrolyte, and can reduce the surface tension of the electrolyte, thereby improving the core immersion rate.

Description

Technical field [0001] The present invention relates to the technical field of electrolyte, in particular to an aluminum electrolytic capacitor electrolyte and a preparation method thereof, and an aluminum electrolytic capacitor using the aluminum electrolytic capacitor electrolyte. Background technique [0002] At present, due to the filtering and energy storage functions of aluminum electrolytic capacitors, they are widely used in charging piles. However, in a lower temperature environment, the capacity of aluminum electrolytic capacitors will decrease, and the ESR value will increase exponentially, resulting in heat loss of the capacitor, resulting in its service life being far below the required use time of electric vehicles. [0003] As the actual cathode of an aluminum electrolytic capacitor, the electrolyte plays an important role in the physical properties of the capacitor. The electrolyte mainly includes solutes and solvents. Among them, the solvent is the main factor aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/145
CPCH01G9/035H01G9/145
Inventor 李文奎余克壮林翠华
Owner 深圳市智胜新电子技术有限公司
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