Electrolytic Capacitor Electrolyte for Low-Scintillation High Voltage
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Solution Overview
Problem
High voltage electrolytic capacitors used in implantable cardioverter defibrillators face challenges in minimizing size while maintaining high energy density and efficiency, as conventional capacitors require large components and are prone to scintillations at higher voltages, leading to energy loss and reduced delivered-to-store ratio.
Innovation Solution
A method for manufacturing electrolytic capacitors involving the formation of an ester material from glycol and acids, followed by quenching and addition of ammonium-based materials, results in an electrolytic material with optimized conductivity and reduced scintillation rates, achieving a high delivered-to-store ratio and improved voltage withstand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If higher conductivity electrolytes are used to improve delivered-to-store ratio, then discharge efficiency is improved, but scintillations occur that damage the oxide and lead to energy loss
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte by using a carboxylic acid salt (such as lithium acetate, lithium propionate, or lithium butyrate) instead of traditional electrolytes. This parameter change allows the electrolyte to maintain high conductivity for efficient energy delivery while suppressing scintillation damage to the oxide layer, thereby resolving the contradiction between energy efficiency and reliability.
Solution Approach 2:
The patent creates a composite electrolyte system combining carboxylic acid salts with specific solvents (cyclic carbonates like EC, PC, or GC). This composite material approach achieves both high conductivity and low scintillation rates by leveraging the synergistic effects of the salt and solvent components, simultaneously improving delivered-to-store ratio and protecting the oxide layer.
2Quantity of substance
If the working voltage is increased to reduce capacitor size, then energy density is improved, but scintillations increase causing energy loss
Solution Approach 1:
The patent changes the electrolyte composition parameters by introducing carboxylic acid salts with specific molecular structures (acetate, propionate, butyrate). These parameter changes enable the electrolyte to withstand higher working voltages (900V-1000V) without generating scintillations, thus achieving high energy density while maintaining low energy loss.
3Use of energy by moving object
If conventional high voltage capacitors are used to achieve 80J energy output, then required energy is delivered, but device size becomes 60-70 cc
Solution Approach 1:
The patent changes multiple parameters including electrolyte composition (carboxylic acid salt concentration), solvent type (cyclic carbonate selection), and operating voltage (900V-1000V). These parameter changes enable the capacitor to achieve 80J energy output with significantly reduced volume, shrinking the device from conventional 60-70 cc to a more compact size suitable for implantable applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process yields capacitors with a high delivered-to-store ratio, reduced scintillation rates, and increased voltage withstand, enabling smaller, more efficient energy storage for implantable cardioverter defibrillators while maintaining battery life and reducing size requirements.
Implementation Method 1
quenching the ester material for a determined period
Implementation Method 2
the electrolyte that is used for the ionic mobility of the charge through from the anode to the cathode
Implementation Method 3
Aluminum electrolytic capacitors energy density is directly related to the surface area of the anodes generated in the electrochemical etching processes
Data Source
AI summary
A method is provided for manufacturing an electrolytic capacitor for an implantable cardioverter defibrillator. The method includes forming an ester material by adding at least one acid to a glycol, and quenching the ester material for a determined period. The method also includes adding an ammonium based material to the ester material after the ester material is quenched, and adding an additional acid after adding the ammonium based material to form an electrolytic material for the electrolytic capacitor.