Redox Flow Battery Cleansing Cycle for Electrolyte Rebalancing
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Solution Overview
Problem
Redox flow battery systems face capacity degradation due to electrolyte imbalances and side reactions, which existing methods fail to adequately mitigate, leading to increased system complexity and cost.
Innovation Solution
A method involving circulating positive and negative electrolytes between respective compartments using pumps, and performing a cleansing cycle by mixing them when battery capacity falls below a threshold, maintaining electrolyte health without additional storage tanks, thereby reducing system complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional chemicals are added to the redox flow battery system to reduce electrolyte imbalance, then capacity degradation is mitigated, but system complexity and cost increase due to separate tanks and additional chemicals
Solution Approach 1:
The patent merges the positive and negative electrolyte systems by allowing them to mix during a cleansing cycle. Instead of using separate tanks and additional chemicals to manage electrolyte imbalance, the invention combines the two electrolyte streams and uses their interaction to restore balance, thereby eliminating the need for separate storage tanks and reducing system complexity.
Solution Approach 2:
The cleansing cycle enables the redox flow battery system to self-correct its own electrolyte imbalance. By circulating and mixing the electrolytes during the cleansing cycle, the system automatically rebalances itself without requiring external chemicals or additional subsystems, making the system self-maintaining.
2Reliability
If additional chemicals and separate tanks are used to manage electrolyte states, then electrolyte imbalance is reduced, but system cost increases
Solution Approach 1:
The invention combines the functions of multiple separate tanks into a single integrated system. The positive and negative electrolytes are mixed in the existing cell during the cleansing cycle, eliminating the need for separate storage tanks and the chemicals they would contain, thereby reducing manufacturing cost.
Solution Approach 2:
The existing cell structure is made multi-functional by using it both for normal charge/discharge operations and for the cleansing cycle. The same cell that stores and processes electrolytes during operation also serves as the mixing chamber during cleansing, eliminating the need for additional dedicated tanks or equipment.
3Reliability
If electrolyte imbalance is not sufficiently mitigated due to subsystem inefficiencies, then capacity degradation occurs over time, but adding more subsystems increases system complexity
Solution Approach 1:
The cleansing cycle is implemented as a periodic maintenance operation that continuously restores electrolyte balance. By repeatedly circulating and mixing the electrolytes at scheduled intervals, the system maintains capacity over time through continuous corrective action rather than relying on complex real-time monitoring and adjustment subsystems.
Solution Approach 2:
The system uses periodic cleansing cycles to maintain electrolyte balance. Instead of implementing continuous complex monitoring and adjustment subsystems, the invention applies simple mixing operations at periodic intervals, achieving capacity maintenance through time-based periodic maintenance rather than continuous complex control.
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 approach extends the number of charge and discharge cycles without significant capacity loss, maintaining electrolyte health and reducing system complexity and cost compared to conventional methods.
Implementation Method 1
circulating a positive electrolyte between a positive electrode compartment and a positive electrolyte chamber with a positive electrolyte pump
Implementation Method 2
circulating a negative electrolyte between a negative electrode compartment and a negative electrolyte chamber with a negative electrolyte pump
Implementation Method 3
performing a battery cleansing cycle, including mixing the positive electrolyte with the negative electrolyte until a redox flow battery state of charge (SOC) is less than a threshold SOC
Data Source
AI summary
A method of cleansing a redox flow battery system may include operating the redox flow battery system in a charge, discharge, or idle mode, and responsive to a redox flow battery capacity being less than a threshold battery capacity, mixing the positive electrolyte with the negative electrolyte. In this way, battery capacity degradation following cyclic charging and discharging of the redox flow battery system can be substantially reduced.