Alkaline Battery Third Electrode Gas Pressure Control
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Solution Overview
Problem
Current rechargeable aqueous electrolyte battery technologies face inefficiencies due to gas generation competing with energy storage reactions, leading to unbalanced electrode states of charge and safety concerns from excessive gas pressure, which can result in battery short-circuiting and health hazards.
Innovation Solution
An electrochemical cell with a sealed vessel and a microcontroller-activated third electrode that catalyzes electrolysis to balance hydrogen and oxygen partial pressures, using sensors to monitor and adjust gas generation to maintain safe pressure levels and electrode charge balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas recombination is enhanced to maintain safe pressure levels, then battery safety is improved, but device complexity increases due to additional recombiner components
Solution Approach 1:
The battery system uses its own electrodes and electrolyte to perform gas recombination internally through electrochemical reactions, eliminating the need for external recombiner devices. The system serves itself by converting excess gas back into useful chemical energy storage.
Solution Approach 2:
The invention removes the separate recombiner component from the battery system and integrates the recombination function directly into the electrode-electrolyte system, simplifying the overall device architecture while maintaining safety.
2Reliability
If gas generation is increased to balance electrode states of charge, then charge balance is improved, but gas pressure control becomes more difficult
Solution Approach 1:
The system continuously monitors the states of charge of both electrodes and dynamically adjusts the electrochemical reactions to maintain charge balance. The feedback mechanism ensures that gas generation is optimized for charge balancing while pressure constraints are respected.
Solution Approach 2:
The invention changes the operational parameters of the electrochemical cell, specifically controlling the potential differences and current distribution to optimize gas generation for charge balancing while maintaining pressure within safe limits through dynamic parameter adjustment.
3Stress or pressure
If relief valves are used to vent excess gas, then gas pressure is controlled, but hydrogen and oxygen mixtures are released to the environment creating safety hazards
Solution Approach 1:
Instead of venting harmful gas mixtures to the environment, the invention converts the excess gas back into useful chemical energy by driving electrochemical reactions that regenerate water and restore electrode charge balance, transforming a harmful byproduct into a beneficial energy storage mechanism.
Solution Approach 2:
The system recovers the chemical energy that would otherwise be lost through gas venting by using the excess hydrogen and oxygen to drive reverse electrochemical reactions, converting them back into water and electrical energy that can be stored in the electrodes.
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
This solution effectively maintains safe gas pressures, balances electrode states of charge, and maximizes battery efficiency, preventing short-circuiting and extending cycle life while reducing environmental hazards.
Implementation Method 1
The third electrode is composed of material that catalyzes the electrolysis reaction when connected to either the anode or the cathode
Implementation Method 2
They are commonly made of high surface area catalytic materials such as platinum or palladium powder
Implementation Method 3
A process called recombination can convert the hydrogen and oxygen gas to liquid water which can go back into the electrolyte
Data Source
AI summary
An inventive, new system that measures gas composition and pressure in the headspace of an aqueous electrolyte battery is described. The system includes a microcontroller that can use the composition and pressure information to connect a third electrode to either the anode(s) or the cathode(s) in order to balance the state of charge between the two. Results have shown that such a system can control the gas pressure inside a sealed flooded aqueous electrolyte battery to remain below 20 kPa (3 psi) and greatly extend the useable life of the battery.