Battery Cell Aging Detection Using Reversible Heat Ratio
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Solution Overview
Problem
Existing methods fail to effectively utilize temperature variation characteristics for real-time detection of battery aging, leading to a gap in monitoring battery capacity and lifespan degradation.
Innovation Solution
A method and device that calculate a reversible heat ratio based on heat values generated during charging and discharging phases of a battery cell, using specific heat capacity and temperature, to determine aging by comparing the ratio against a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature characteristics are only used in thermal runaway scenarios, then safety monitoring is maintained, but real-time aging detection capability is lost
Solution Approach 1:
The patent changes the parameter being measured from general temperature to reversible heat ratio, which is calculated from temperature variations during charging and discharging phases. This parameter transformation enables the system to detect aging while maintaining safety monitoring functionality
Solution Approach 2:
The patent segments the temperature measurement process into charging phase temperature and discharging phase temperature, then calculates heat values separately for each phase. This segmentation enables the derivation of reversible heat ratio, which serves as an aging indicator while preserving safety monitoring
2Measurement precision
If complex detection methods are used for battery aging, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses the battery cell's own temperature characteristics during normal charging and discharging operations to detect aging. The existing temperature sensors and operational data are leveraged to calculate reversible heat ratio, eliminating the need for additional specialized detection equipment
Solution Approach 2:
The patent replaces complex physical aging detection systems with a computational approach, using thermodynamic calculations based on temperature data to determine aging state through reversible heat ratio analysis
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 real-time monitoring of battery aging through temperature variation characteristics, simplifying detection and reducing costs by utilizing thermal characteristics for battery health assessment.
Implementation Method 1
A first heat value and a second heat value of the battery cell to be detected are calculated based on the mass, the composite specific heat capacity, and the temperature of the battery cell to be detected, where the first heat value is the sum of the heat generated in the multiple charging phases of the battery cell to be detected, and the second heat value is the sum of the heat generated in the multiple discharging phases of the battery cell to be detected
Data Source
AI summary
A method includes: determining multiple charging phases and multiple discharging phases of a battery cell to be detected; calculating a first heat value and a second heat value of the battery cell to be detected based on a mass, a composite specific heat capacity, and a temperature of the battery cell to be detected; calculating a reversible heat ratio of the battery cell to be detected based on the first heat value and the second heat value; and determining whether the battery cell to be detected has an aging issue based on the reversible heat ratio.