US12573563USUSPTO Grant XML

Electrolytic capacitor with electrolyte and hydrophilic compound containing liquid

An electrolytic capacitor 1 includes: a capacitor element 3 in which an anode foil 5 and a cathode foil 7 each having a dielectric oxide film face each other across a separator 6 ; a body case 2 that houses the capacitor element 3 ; and a sealing member 4 that seals the body case 2 . An electrolyte and a hydrophilic compound are held between the anode foil 5 and the cathode foil 7 . A sealing member deterioration preventing agent immiscible with the hydrophilic compound is arranged inside the body case 2.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

electrolyte and a hydrophilic compound are held between the anode foil 5 and the cathode foil 7 .

Uses

Lithium-ion cells, EV batteries, Grid storage

Assignee

SUN Electronic Industries Corp.

Published

Mar 10, 2026

Inventors

Hirokazu Nishikori, Takashi Takezawa, Masakazu Hosogi, Tadahito Ito

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

electrolytic capacitor 1 includes: a capacitor element 3 in which an anode foil 5 and a cathode foil 7 each having a dielectric oxide film face each other across a separator 6 ; a body case 2 that houses the capacitor element 3 ; and a sealing member 4 that seals the body case 2 .

Key novelty

electrolyte and a hydrophilic compound are held between the anode foil 5 and the cathode foil 7 .

Applications

Lithium-ion cellsEV batteriesGrid storage

Relevant search intents

electrolyte

Claims preview

1 . An electrolytic capacitor, comprising: a capacitor element in which an anode foil and a cathode foil each having a dielectric oxide film face each other across a separator; a body case that houses the capacitor element; and a sealing member that seals the body case, wherein an electrolyte and a liquid containing a hydrophilic compound are held between the anode foil and the cathode foil, a sealing member deterioration preventing agent immiscible with the hydrophilic compound is arranged inside the body case, the sealing member deterioration preventing agent is arranged inside the body case, in a state immiscible with the hydrophilic compound within the capacitor element, the liquid contains the hydrophilic compound as at least part of a solvent, the liquid is an electrolytic solution having the electrolyte dissolved in the solvent, and the hydrophilic compound accounts for 50% by weight of the solvent. 2 . The electrolytic capacitor according to claim 1 , wherein the sealing member deterioration preventing agent is a terpenoid, an unsaturated fatty acid, a polyglycerol ester containing within a molecule thereof an unsaturated fatty acid group, a saturated fatty acid, or a derivative of any thereof. 3 . The electrolytic capacitor according to claim 1 , wherein the hydrophilic compound has a boiling point of 180 C. or higher.

Linked approaches

Fire-resistant electrolytes

Electrolyte formulations that suppress ignition and heat release.

Related patents

Solid electrolytes and methods for making the same

US12570540 • Florida State University Research Foundation, Inc.

Electrolyte circulation-based sodium hypochlorite generator with automatic electrolytic cell cleaning function

US12571111 • JTECHWATER CO., LTD.

Nonaqueous electrolyte secondary battery

US12573623 • PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Polymer, solid-state electrolyte, gel electrolyte, and battery

US12570773 • ZHUHAI COSMX BATTERY CO., LTD.