Fiber-Optic Battery Probe for Simultaneous Temperature and SOC Sensing
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Solution Overview
Problem
Current sensors are unable to simultaneously measure internal temperature and the state of lithiation of an accumulator electrode with a single sensor, which is necessary for accurate estimation of the state of charge (SOC) of a battery.
Innovation Solution
A fiber-optic sensor with an optical probe comprising thermoluminescent materials that emit light at multiple wavelengths, allowing for simultaneous measurement of temperature and state of lithiation through luminescence ratiometry and absorption spectroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fiber-optic sensor is used to measure both temperature and state of charge, then device complexity is reduced, but measurement precision deteriorates due to the inability to simultaneously capture both parameters accurately
Solution Approach 1:
The patent combines temperature sensing and state of charge measurement functions into a single fiber-optic sensor by integrating two thermoluminescent materials with different emission characteristics. One material emits at a wavelength insensitive to electrode absorption (for temperature measurement), while the other emits at a wavelength sensitive to electrode absorption (for SOC measurement). This merging eliminates the need for separate sensors while maintaining measurement precision through differential analysis of the two emission signals.
Solution Approach 2:
The fiber-optic sensor achieves multi-functionality by incorporating thermoluminescent materials that can simultaneously provide temperature information and state of charge information through their optical emission properties. The sensor probe serves dual purposes: monitoring thermal conditions and detecting electrochemical state, making a single device capable of performing multiple measurement functions that traditionally required separate specialized sensors.
2Measurement precision
If thermoluminescent materials are used for simultaneous temperature and SOC measurement, then measurement capability is improved, but device complexity increases due to the need for multiple emission peaks and spectral analysis
Solution Approach 1:
The patent replaces complex mechanical or electronic multi-sensor arrangements with an optical solution based on thermoluminescence spectroscopy. Instead of using multiple separate physical sensors, the system uses the optical emission spectrum of thermoluminescent materials to encode both temperature and SOC information. The complexity is shifted from mechanical/electronic hardware to optical signal processing, where spectral analysis of the emitted light provides both measurement parameters simultaneously.
Solution Approach 2:
The invention utilizes changes in optical parameters (emission wavelength and intensity) of thermoluminescent materials to encode multiple measurement information. By selecting materials with specific emission characteristics that respond differently to temperature versus SOC changes, the system transforms physical-chemical parameter changes into distinguishable optical signals that can be decoded to extract both temperature and state of charge data from a single measurement.
3Loss of time
If a single sensor measures both parameters, then loss of time is reduced by eliminating sequential measurements, but measurement precision deteriorates due to interference between temperature and SOC signals
Solution Approach 1:
The patent segments the measurement information by assigning different spectral regions to different parameters. One thermoluminescent material's emission at a specific wavelength is used exclusively for temperature measurement, while another material's emission at a different wavelength is used for SOC measurement. This spectral segmentation allows simultaneous measurement without signal interference, as each parameter is extracted from a distinct portion of the optical spectrum, enabling time-efficient concurrent measurement while maintaining precision through spectral separation.
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 simultaneous measurement of internal temperature and state of lithiation, effectively estimating the state of charge (SOC) of a battery, thereby improving battery management and performance.
Implementation Method 1
The term 'thermoluminescence' is understood here and within the scope of the invention to mean the ability of a material to emit, almost instantaneously, at a given temperature and under the effect of light radiation referred to as absorption or excitation radiation, light radiation of the same wavelength or of a different wavelength, referred to as emission radiation.
Implementation Method 2
at one or more emission peaks in a region of variation of the optical absorption spectrum of the insertion material of an electrode
Data Source
AI summary
Sensor for sensing temperature and measuring the state of charge (SOC) of a fiber-optic accumulator comprising one or more thermoluminescent materials, at one or more emission peaks in a region of variation of the optical absorption spectrum of the insertion material of an electrode. A sensor for sensing temperature and measuring the state of charge (SOC) of a metal-ion accumulator, including an optical fiber one free end of which forms an optical probe including one or more thermoluminescent materials capable of emitting a light peak at at least two wavelengths, at least one of the two peaks being designed to be in at least one region of variation of the optical absorption spectrum of the metal ion insertion material of at least one electrode of the accumulator, the ratio of the two peaks depending on the temperature of the accumulator and the variation in intensity of at least one of the two peaks being dependent on the insertion of the metal ions into the electrode.