Hydrogen-Redox Flow Battery Pressure Control
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Solution Overview
Problem
Existing flow battery systems using hydrogen and halogen ions face challenges with complex and costly pressure control systems, which reduce efficiency, reliability, and increase costs due to the need for external compressors and additional components to maintain pressure differences between hydrogen and electrolyte chambers.
Innovation Solution
A hydrogen-redox flow battery assembly that allows an uncontrolled pressure difference between the hydrogen and electrolyte chambers, determined by proton diffusion through the membrane electrode assembly, eliminating the need for complex pressure control systems and external compressors, and allowing the hydrogen and electrolyte reservoirs to fluctuate freely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If an external hydrogen compressor is used to compress hydrogen gas, then hydrogen storage pressure is maintained, but system cost and complexity increase significantly
Solution Approach 1:
The invention extracts and eliminates the external hydrogen compressor from the system. Instead of using a mechanical compressor to maintain hydrogen pressure, the system allows the hydrogen chamber pressure to fluctuate naturally based on the electrochemical reactions, removing the complex pressure control mechanism while maintaining functional performance.
Solution Approach 2:
The hydrogen chamber serves itself by allowing pressure to be determined automatically by the proton diffusion process and hydrogen storage needs. The system self-regulates pressure through the electrochemical reactions without requiring external mechanical intervention or complex control systems.
2Stress or pressure
If pressure control systems with sensors and pumps are implemented, then pressure difference between chambers is maintained, but manufacturing cost increases
Solution Approach 1:
The invention removes pressure control systems including sensors, pumps, and associated control mechanisms. The pressure difference between hydrogen and electrolyte chambers is maintained passively through the membrane structure and natural proton diffusion processes, eliminating the need for active pressure control components and reducing manufacturing costs.
Solution Approach 2:
The invention replaces mechanical pressure control systems with an electrochemical-membrane based pressure regulation mechanism. The proton-selective membrane and electrochemical reactions naturally establish and maintain the required pressure difference without mechanical intervention.
3Strength
If tight pressure control is implemented to protect the membrane, then membrane damage is avoided, but system reliability decreases due to more components
Solution Approach 1:
The membrane is protected through self-regulating electrochemical processes and natural pressure equilibrium. The proton diffusion rate and electrochemical reactions automatically prevent excessive pressure buildup that could damage the membrane, eliminating the need for additional protective components that would reduce system reliability.
Solution Approach 2:
The system allows pressure parameters to fluctuate within safe ranges determined by the electrochemical reaction rates and membrane properties. Rather than maintaining tight pressure control, the system exploits the natural parameter changes during charge/discharge cycles while the membrane design and electrochemical processes ensure protection against damage.
4Stress or pressure
If external compressors and pressure control components are used, then hydrogen pressure is regulated, but energy efficiency decreases
Solution Approach 1:
The invention replaces energy-intensive mechanical compression with electrochemical proton diffusion through the membrane. Hydrogen pressure regulation is achieved through the natural thermodynamic processes of the electrochemical reactions and proton transport, eliminating the energy losses associated with mechanical compressors and pressure control systems.
Solution Approach 2:
The hydrogen pressure regulation is performed by the electrochemical system itself through proton diffusion and reaction dynamics. The system uses its own operational processes to maintain functional pressure levels without requiring additional energy input from external compression devices.
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 design simplifies the construction, reduces manufacturing and maintenance costs, enhances reliability, and increases efficiency by eliminating the need for energy-inefficient pressure control systems while maintaining optimal storage and power capacity.
Implementation Method 1
a membrane electrode assembly comprising a hydrogen electrode connected to the hydrogen chamber and an electrolyte electrode connected to the electrolyte chamber, and a membrane positioned between the hydrogen chamber and the electrolyte chamber, the membrane electrode assembly configured to only allow a diffusion of protons through the membrane electrode assembly between the hydrogen gas in the hydrogen chamber and the liquid electrolyte in the electrolyte chamber
Implementation Method 2
a flow battery assembly used to electrochemically generate and store electric power, especially to a flow battery assembly in which both charging and discharging reactions happen in the presence of hydrogen and of an electrolyte comprising a halogen ion
Data Source
AI summary
A hydrogen-redox flow battery assembly comprises one or more battery cells and is used to electrochemically generate and store electric power. Each battery cell includes a hydrogen chamber, an electrolyte chamber, a membrane electrode assembly positioned between the hydrogen chamber and the electrolyte chamber, a hydrogen reservoir and an electrolyte reservoir. The hydrogen-redox flow battery assembly is configured to allow an uncontrolled pressure difference between the pressure in the hydrogen chamber and the pressure in the electrolyte chamber, the pressure difference determined by a diffusion of protons through the membrane electrode assembly during a charge and/or a discharge operation. The one or more battery cells of the hydrogen-redox flow battery assembly is/are completely positioned in the hydrogen reservoir.