Optical Fiber Sensor Monitoring Intercalation Stage Changes
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Solution Overview
Problem
Conventional battery management systems (BMS) struggle to provide accurate state-of-charge (SOC) and state-of-health (SOH) information for electrochemical energy storage devices, especially in smart grid and electric vehicle systems, due to limitations in measuring internal parameters like intercalation stage changes, which are crucial for reliable energy management and preventing degradation.
Innovation Solution
A monitoring and management system utilizing optical fibers with sensors to detect strain and temperature changes, allowing for real-time analysis of intercalation stage transitions within electrochemical energy devices, thereby providing more accurate SOC and SOH data through the use of fiber Bragg grating sensors and processors that analyze these parameters to determine the current intercalation state and generate reliable operational information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional voltage and current measurements are used to determine SOC, then the measurement method is simple, but the SOC estimation accuracy deteriorates due to flat voltage regions and aging-related correlation changes
Solution Approach 1:
The patent introduces an optical fiber sensor as an intermediary measurement tool that detects intercalation stage changes through strain and temperature signals. This mediator provides indirect but more accurate information about the battery's internal state, bypassing the limitations of direct voltage measurement while adding minimal system complexity.
Solution Approach 2:
The patent replaces the conventional electrical measurement system (voltage and current sensors) with an optical measurement system. By substituting electrical signals with optical signals detected through fiber Bragg grating sensors, the system achieves higher measurement precision for intercalation stage detection without being affected by electrical interference or voltage flatness issues.
2Reliability
If conventional BMS methods are used to detect battery failure, then the system is simple, but the ability to predict failure in advance deteriorates, limiting detection to end-of-life scenarios
Solution Approach 1:
The patent implements preliminary detection of intercalation stage changes that precede battery failure. By monitoring strain and temperature signals through optical fibers, the system detects early signs of degradation and intercalation anomalies before they lead to complete failure, enabling predictive maintenance and preventing catastrophic failures.
Solution Approach 2:
The patent establishes a feedback mechanism where optical sensor data on strain and temperature is continuously analyzed to detect changes in intercalation behavior. This feedback loop provides real-time information about battery health trends, allowing the system to predict future failure modes and adjust operational parameters to extend battery life.
3Measurement precision
If optical fiber sensors are used to detect intercalation stage changes, then the measurement accuracy improves, but the device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The patent makes the optical fiber sensor system multi-functional by using the same sensor infrastructure to simultaneously measure both strain and temperature. This universal approach allows a single optical fiber network to provide multiple measurement functions, reducing overall system complexity compared to using separate dedicated sensors for each parameter.
Solution Approach 2:
The patent combines strain measurement and temperature measurement capabilities into a unified optical sensing system. By merging these functions into a single optical fiber-based platform using fiber Bragg grating technology, the system achieves high measurement precision for intercalation stage detection while minimizing the increase in device complexity through functional integration.
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 enables more accurate and reliable monitoring of SOC and SOH, reducing the need for conservative overdesign in energy systems, improving the management of electrochemical energy storage devices, and extending their operational lifespan by providing precise data on remaining energy and health.
Implementation Method 1
a optical sensor configured to sense a strain of the battery housing
Implementation Method 2
a optical sensor configured to sense a temperature of the battery
Implementation Method 3
The output of the optical sensor is an electrical signal that includes information about the operating parameter of the battery
Data Source
AI summary
A system includes utilizes optical sensors arranged within or on portions of an electrochemical energy device (e.g., a rechargeable Li-ion battery, supercapacitor or fuel cell) to measure operating parameters (e.g., mechanical strain and/or temperature) of the electrochemical energy device during charge/recharge cycling. The measured parameter data is transmitted by way of light signals along optical fibers to a controller, which converts the light signals to electrical data signal using a light source/analyzer. A processor then extracts temperature and strain data features from the data signals, and utilizes a model-based process to detect intercalation stage changes (i.e., characteristic crystalline structure changes caused by certain concentrations of guest species, such as Li-ions, within the electrode material of the electrochemical energy device) indicated by the data features. The detected intercalation stage changes are used to generate highly accurate operating state information (e.g., state-of-charge and state-of-health), and management/control signals for optimizing charge/discharge rates.