Redox Flow Battery Bank SOC Control for Side-Reaction Recovery
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Solution Overview
Problem
Redox flow batteries face challenges in enhancing energy density while minimizing side reactions that degrade battery performance, as existing methods limit the state of charge (SOC) range to prevent such reactions, thereby restricting the battery's operational flexibility and capacity.
Innovation Solution
The proposed solution involves a redox flow battery system with multiple banks, where some banks (first banks) operate within a standard SOC range to prevent side reactions, while others (second banks) are controlled to different SOC levels to reversibly dissolve side reaction products, allowing for expanded SOC usage without performance degradation, enabling continuous operation and improved energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the state of charge (SOC) range is expanded to enhance energy density, then the battery capacity is improved, but side reactions occur that degrade battery performance
Solution Approach 1:
The battery system is divided into multiple independent banks, each capable of operating at different SOC ranges. This segmentation allows the system to expand total capacity by adding banks operating at higher SOC while maintaining reliability through separate banks operating at lower, safer SOC levels.
Solution Approach 2:
Different banks are operated at different SOC parameters - some banks operate within a limited SOC range to prevent side reactions, while other banks operate at expanded SOC ranges to provide additional capacity. The system dynamically adjusts which banks are active and at what SOC levels based on operational requirements.
2Reliability
If the SOC range is limited to prevent side reactions, then battery performance is maintained, but operational flexibility and energy density are restricted
Solution Approach 1:
The battery system is divided into multiple independent banks, each capable of operating at different SOC ranges. This segmentation allows the system to expand total capacity by adding banks operating at higher SOC while maintaining reliability through separate banks operating at lower, safer SOC levels.
Solution Approach 2:
The system dynamically adjusts which banks are active and at what SOC levels based on operational requirements. Banks can be switched between different operational modes (limited SOC vs. expanded SOC) depending on whether priority is given to reliability or energy density, providing operational flexibility.
3Device complexity
If all banks operate at the same SOC level, then system simplicity is maintained, but the ability to recover from side reactions and expand capacity is limited
Solution Approach 1:
The battery system is divided into multiple independent banks, each capable of operating at different SOC ranges. This segmentation allows the system to expand total capacity by adding banks operating at higher SOC while maintaining reliability through separate banks operating at lower, safer SOC levels.
Solution Approach 2:
Different banks are operated at different SOC parameters - some banks operate within a limited SOC range to prevent side reactions, while other banks operate at expanded SOC ranges to provide additional capacity. The system dynamically adjusts which banks are active and at what SOC levels based on operational requirements.
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 enhances energy density by expanding the SOC range in first banks and allows for continuous recovery of electrolytic solutions in second banks, reducing operational restrictions and maintaining battery performance by periodically shifting SOC levels, thus improving overall battery efficiency.
Implementation Method 1
a power conversion device provided in each of the plurality of banks; and a controller that controls a state of charge of each of the plurality of banks by controlling the power conversion device
Implementation Method 2
each of the plurality of banks includes a battery cell that performs charging and discharging by the supply of an electrolytic solution
Data Source
AI summary
A redox flow battery system includes: a plurality of banks; a power conversion device provided in each of the plurality of banks; and a controller that controls a state of charge of each of the plurality of banks by controlling the power conversion device. In the redox flow battery system, each of the plurality of banks includes a battery cell that performs charging and discharging by a supply of an electrolytic solution, the plurality of banks include: a plurality of first banks controlled to be in a first state of charge; and one or more second banks excluding the first banks, and the controller controls a state of charge of the second bank to be a second state of charge different from the first state of charge.