Lithium-Ion Battery Deterioration Rate Estimation Using Voltage and Temperature
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Solution Overview
Problem
The existing methods are unable to accurately determine the deterioration rate of lithium-ion batteries, as it relies solely on temperature information, which is insufficient.
Innovation Solution
A method that acquires battery voltage and temperature information, estimates deterioration rate based on correspondence between voltage ranges and temperature, and corrects voltage ranges using accumulated deterioration data to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only temperature information is used to determine deterioration rate, then the measurement process is simple, but the measurement precision is insufficient
Solution Approach 1:
The patent segments the determination process into multiple independent measurement steps: voltage measurement at first state of charge, voltage measurement at second state of charge, temperature measurement, and deterioration rate calculation. This segmentation allows comprehensive data collection while maintaining clear, manageable measurement procedures.
Solution Approach 2:
The patent transitions from one-dimensional temperature-based deterioration assessment to two-dimensional assessment by incorporating voltage measurements at different state of charge levels. This dimensional expansion enables more comprehensive characterization of battery deterioration without excessive complexity.
2Measurement precision
If voltage range correspondence information is corrected based on accumulated deterioration amount, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent implements feedback by using the calculated deterioration amount to correct the voltage range correspondence information. This corrected information is then used in subsequent deterioration rate estimations, creating a self-improving measurement system that increases precision through iterative refinement.
Solution Approach 2:
The patent performs preliminary correction of voltage range correspondence information based on accumulated deterioration data before using it for future measurements. This preliminary action ensures that subsequent deterioration rate estimations use the most accurate reference data available, improving overall measurement precision.
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 allows for more accurate estimation of lithium-ion battery deterioration rates by accounting for changes in stage structures of the negative electrode, improving the precision of battery health assessment.
Implementation Method 1
a negative electrode having stage structures switching depending on an electric storage amount
Implementation Method 2
The lithium-ion battery experiences a reduced battery capacity and thus suffers deterioration due to repeated charge and discharge
Implementation Method 3
Since the deterioration rate of the lithium-ion battery follows the Arrhenius law, the deterioration rate is increased as the temperature rises
Data Source
AI summary
A deterioration rate estimation method for a lithium-ion battery of estimating the deterioration rate of the lithium-ion battery including a negative electrode having stage structures switching depending on an electric storage amount includes a first step of acquiring first information about the stage structure, a second step of acquiring second information about the battery temperature of the lithium-ion battery, and a third step of estimating the deterioration rate from the first information and the second information.