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Electrolytic capacitor

A technology for electrolytic capacitors and capacitors, which is applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problems of insufficient withstand voltage, high withstand voltage, and inability to take into account chemical conversion properties of anode foils, and achieve good chemical conversion properties and high resistance. Voltage, the effect of reducing impedance

Pending Publication Date: 2022-01-28
路碧康株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the configurations of Patent Document 4 and Patent Document 5 cannot achieve both good chemical conversion performance and high withstand voltage, and it is determined that there are problems such as the progression of deterioration of the anode foil and the failure due to insufficient withstand voltage depending on the usage conditions of the electrolytic capacitor.

Method used

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  • Electrolytic capacitor
  • Electrolytic capacitor
  • Electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0048] Amine salts of polycarboxylic acids Example 2e 1 ~ 6 of the electrolytic solution containing ethylene glycol, water, and from 1 to 12 [% by mass], and adding hypophosphorous acid or a salt thereof 0.01 to 2 [mass%]. For making good the respective embodiments of the electrolytic solution in Example 2e spark voltage were measured and evaluated 400V arrival time [sec] and up to the voltage [V]. The composition of each electrolyte, and the performance evaluation results are shown in Table 1 below.

[0049] [Table 1]

[0050] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Ethylene glycol [wt%] 78.2 76.2 73.2 70.2 67.2 65.2 Water [wt%] 10.0 10.0 10.0 10.0 10.0 15.0 Dimethylene methamine [wt%] 1.0 3.0 6.0 9.0 12.0 9.0 Polyether additive [wt%] 10.0 10.0 10.0 10.0 10.0 10.0 Phosphate [wt%] 0.5 0.5 0.5 0.5 0.5 0.5 Ammonium hyposphate [wt%] 0.3 0.3 0.3 0.3 0.3 0.3 400V reaches time [second] 1...

reference example 1～2

[0052] Amine salts of polycarboxylic acids Reference Examples 1 to 2 electrolytic solution containing ethylene glycol, water and 14 to 20 [% by mass], and adding hypophosphorous acid or a salt thereof 0.01 to 2 [mass%]. For each of the prepared electrolytic solution for a good reference example spark voltage were measured and evaluated 400V arrival time [sec] and up to the voltage [V]. The composition of each electrolyte, and the performance evaluation results are shown in Table 2 below.

[0053] [Table 2]

[0054] Reference Example 1 Reference Example 2 Ethylene glycol [wt%] 65.2 59.2 Water [wt%] 10.0 10.0 Dimethylene methamine [wt%] 14.0 20.0 Polyether additive [wt%] 10.0 10.0 Phosphate [wt%] 0.5 0.5 Ammonium hyposphate [wt%] 0.3 0.3 400V reaches time [second] 148 154 Up to the voltage [V] 421 409

Embodiment 7～8

[0066] Amine salts of polycarboxylic acids electrolytic solution in Example 7-8 containing ethylene glycol, water, and from 1 to 12 [% by mass], and adding hypophosphorous acid or a salt thereof 0.01 to 2 [mass%]. For making good the respective embodiments of the electrolytic solution in Example 2e spark voltage were measured and evaluated 400V arrival time [sec] and up to the voltage [V]. The composition of each electrolyte, and the performance evaluation results are shown in Table 5 below.

[0067] [table 5]

[0068] Example 7 Example 8 Ethylene glycol [wt%] 73.0 73.5 Water [wt%] 10.0 10.0 Dimethylene methamine [wt%] 6.0 6.0 Polyether additive [wt%] 10.0 10.0 Phosphate [wt%] 0.5 0.0 Subphosphoric acid [wt%] 0.5 0.5 400V reaches time [second] 160 175 Up to the voltage [V] 443 441

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Abstract

Provided is an electrolytic capacitor that has low impedance as a result of the water content thereof being increased, that has a withstand voltage of 400V or more, and that makes it possible to increase long-term reliability. An electrolytic capacitor (1) that serves as a means for solving the problem addressed by the present invention includes ethylene glycol, 10-30 mass% of water, and 1-12 mass% of an amine salt of carboxylic acid as an electrolyte solution (2e), said electrolyte solution (2e) has 0.01-2 mass% of at least one of ammonium hypophosphite, an amine salt of hypophosphoric acid, and hypophosphoric acid added thereto, and the carboxylic acid is a polycarboxylic acid having a chain hydrocarbon skeleton and a molecular weight of 140-500.

Description

Technical field [0001] The present invention relates to an electrolytic capacitor. Background technique [0002] As an example of the electrolytic capacitor, it is configured to include an anode foil and a cathode foil electrically connected to the terminal to form a capacitor element, and an electrolyte is introduced into the capacitor element. The aluminum electrolytic capacitor utilizes an oxide film formed on the surface of the aluminum foil by an electrochemical surface as a dielectric, and the self-repair function is excellent. [0003] As an example, in the use of LED lighting, power circuit, etc., the demand for electrolytic capacitors in medium and high pressure is improved. In the medium and highly composed electrolytic capacitors, low impedance and high reliability have become a topic. [0004] Conventionally, as the electrolyte of the electrolytic capacitor, the following configuration is proposed: ethylene glycol is used as the main solvent, and contains 5 to 7 [% by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/145H01G9/045
CPCH01G9/035H01G9/145H01G9/045Y02E60/13
Inventor 野泽阳介
Owner 路碧康株式会社