Strain-Based Battery Monitoring for Degradation Control
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Solution Overview
Problem
Lithium-ion batteries experience degradation during operation, making it challenging to accurately determine their state of health (SOH) and implement effective battery revival protocols to reduce degradation rates, especially due to varying drive cycles and applications.
Innovation Solution
The method involves using a strain gauge to measure the initial and changed strain of a battery after charge/discharge cycling, correlating strain with battery voltage and SOH, and applying a thermal revival cycle to restore SOH to at least 2.0%, thereby monitoring and controlling electrochemical cell degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional battery testing methods are used to monitor SOH, then the testing process is simple, but the measurement precision of battery degradation is insufficient
Solution Approach 1:
The patent introduces strain gauges as intermediary sensors that indirectly measure battery SOH through mechanical strain detection. Instead of directly measuring electrochemical properties, the strain gauges detect physical deformation of the battery casing caused by internal electrochemical changes, providing a new measurement pathway that improves precision without requiring complex electrochemical analysis equipment
Solution Approach 2:
The patent replaces traditional electrochemical measurement methods with a mechanical measurement approach. By substituting complex electrochemical sensors and analysis systems with simple strain gauge measurements, the system achieves high measurement precision while reducing device complexity. The mechanical strain signal serves as a proxy for electrochemical state, enabling accurate SOH monitoring through a simpler mechanical measurement system
2Duration of action of stationary object
If battery revival protocols are implemented to reduce degradation, then the battery lifespan is extended, but the difficulty of detecting and measuring degradation reduction is high
Solution Approach 1:
The patent implements a feedback mechanism where strain gauge measurements provide continuous information about battery degradation state. This feedback enables real-time monitoring of SOH changes before and after revival protocols, allowing operators to objectively assess whether the revival treatment successfully reduced degradation. The strain signal serves as a quantitative feedback parameter that guides revival protocol effectiveness evaluation
Solution Approach 2:
The patent performs preliminary strain measurements before applying revival protocols to establish a baseline degradation state. This preliminary action enables direct comparison between pre- and post-revival strain signals, making it easier to detect and measure degradation reduction. By capturing the initial strain state, the system creates a reference point that simplifies subsequent evaluation of revival protocol effectiveness
3Measurement precision
If strain gauges are used to monitor battery strain, then the SOH estimation precision is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential mechanical strain signal from the battery system using strain gauges, separating this useful information from the complex electrochemical system. By taking out just the mechanical deformation aspect and measuring it independently, the system achieves precise SOH estimation without needing to measure or model all the complex electrochemical parameters, thus improving precision while managing device complexity
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 precise estimation of battery SOH and reduction in degradation rates through strain-based monitoring and thermal treatment, enhancing battery performance and extending its useful life.
Implementation Method 1
measuring a first strain of the battery (S1) using strain gauge at an initial state of said battery (εo)
Implementation Method 2
a battery revival cycle to reduce battery degradation rates... comprising thermal treatment wherein the SOH is determined to be less than or equal to 2.0%
Data Source
AI summary
A method and system for the monitoring and control of electrochemical cell degradation by use of strain-based battery testing. Strain-based battery is employed to recognize and implement a battery revival cycle to reduce battery degradation rates.