Flow Battery SoC Detection Using In-Situ Optical Electrolyte Sensing
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Solution Overview
Problem
Conventional methods for monitoring the state of charge (SoC) of flow batteries involve damaging the battery structure and are cumbersome, requiring electrolyte extraction and dilution for detection.
Innovation Solution
A non-invasive detection method using a detection device with a light source and receiver to monitor SoC in real-time by emitting light through the electrolyte, analyzing the transmitted signal to determine SoC without extracting electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrolyte is taken out and diluted for detection, then state of charge can be monitored, but battery structure is damaged and detection procedure becomes complicated
Solution Approach 1:
The invention extracts only the necessary detection function from the complex electrolyte handling process. By using an optical sensor to detect light absorption characteristics of the electrolyte in situ, it extracts the state of charge information without physically removing or diluting the electrolyte, thus simplifying the detection procedure while maintaining measurement capability
Solution Approach 2:
The invention replaces the mechanical/chemical detection method (electrolyte extraction and dilution) with an optical detection method. The optical sensor uses light absorption characteristics to detect the state of charge, substituting the complex mechanical handling of electrolyte with a non-contact optical measurement system
2Measurement precision
If electrolyte is taken out for detection, then state of charge can be monitored, but battery structure is damaged
Solution Approach 1:
The invention enables the battery system to monitor its own state of charge using an integrated optical sensor that detects electrolyte properties in situ. The electrolyte itself serves as the detection medium by absorbing light, eliminating the need to extract it for external analysis, thus maintaining battery structure integrity while enabling self-monitoring
Solution Approach 2:
The invention introduces light as an intermediary medium to transfer information about the electrolyte's state of charge. The optical sensor uses light absorption characteristics as a mediator to obtain state of charge information without direct contact or extraction of the electrolyte, preserving the battery structure
3Measurement precision
If conventional detection method is used, then state of charge can be detected, but detection procedure is complicated and time-consuming
Solution Approach 1:
The invention enables continuous real-time monitoring of state of charge through the optical sensor that continuously measures light absorption characteristics of the electrolyte. This replaces the discontinuous, batch-style detection method requiring electrolyte extraction and dilution, providing uninterrupted state of charge information without time loss
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
Enables accurate and convenient real-time monitoring of SoC without damaging the battery structure or complicating procedures.
Implementation Method 1
the light source emits a light with a single wavelength; after the light passes through the negative electrode electrolyte, the receiver receives the light and outputs a signal
Data Source
AI summary
A detection method of a state of charge of a flow battery, comprising: providing a flow battery, executing a preliminary step, and executing a detection step; the preliminary step includes providing a detection device, operating the flow battery with at least one full charge and full discharge in a time interval, and obtaining a waveform according to the signal which is corresponding to a plurality of measured values and a plurality of time values in the time interval; defining the state of charge (SoC) values according to the waveform and obtaining a curve corresponding to the measured values and the plurality of state of charge values; the detection step includes detecting a negative electrode electrolyte and outputting the signal by the detection device; obtaining a value according to the signal; through the curve, one of the state of charge values corresponding to the value is obtained.