Battery Cell Degradation Pattern Control Using OCV Fluctuation
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Solution Overview
Problem
Current battery management systems fail to provide specific information on battery degradation and adjust control conditions based on the degradation rate, leading to inadequate prediction of battery deterioration and lifespan.
Innovation Solution
A battery management apparatus that measures voltage and resistance fluctuations to determine degradation acceleration rates, allowing for adjustments to control conditions such as C-rate and discharge termination voltage to optimize battery performance and extend lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery degradation is monitored only by measuring full charge capacity loss, then the degradation degree can be determined ex post facto, but specific information for predicting future battery state and degradation rate cannot be provided
Solution Approach 1:
The patent measures open circuit voltage (OCV) at predetermined time points before significant degradation occurs, and calculates voltage fluctuation rates in advance. This preliminary measurement and calculation of voltage characteristics allows the system to predict future degradation trends and provide early warning information about battery health status.
Solution Approach 2:
The patent establishes a feedback mechanism where measured OCV values and calculated voltage fluctuation rates are continuously compared against reference values. The system uses this feedback to determine degradation acceleration degrees and adjust control conditions, thereby providing ongoing prediction information about future battery state rather than just historical degradation data.
2Device complexity
If fixed control conditions are used for battery management, then the control system is simple to implement, but the battery cannot adapt to degradation and control optimization is limited
Solution Approach 1:
The patent transforms the static control system into a dynamic one by automatically adjusting control conditions (charging current, discharging current, temperature thresholds) based on real-time degradation assessment. The control parameters are no longer fixed but dynamically modified according to the determined degradation acceleration degree, enabling the system to adapt to battery aging while maintaining manageable complexity through automated adjustment logic.
Solution Approach 2:
The patent changes control parameters (charging current limits, discharging current limits, temperature thresholds) based on degradation stage. By modifying these parameters according to the battery's degradation acceleration degree, the system achieves adaptability without requiring complete system redesign, thus balancing complexity and versatility.
3Productivity
If aggressive charging and discharging rates are used to maximize productivity, then energy output is maximized, but battery degradation accelerates rapidly
Solution Approach 1:
The patent applies preliminary anti-action by implementing control restrictions before severe degradation occurs. Based on voltage fluctuation rate analysis, the system proactively limits charging and discharging rates when degradation acceleration is detected, preventing the aggressive use conditions that would otherwise cause rapid battery deterioration and extend battery lifespan.
Data Source
AI summary
A battery management apparatus for providing more specific information about degradation of a battery cell and changing a control condition according to a degradation pattern of the battery cell. Since not only the degradation degree of the battery cell but also the degradation pattern of the battery cell is estimated, the present state of the battery cell may be more accurately estimated.