Battery Charge Control Using Degradation Acceleration Prediction
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Solution Overview
Problem
Current battery management systems fail to provide specific information about battery degradation and adjust control conditions based on the degradation rate, leading to inadequate prediction of future battery performance 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 charge termination voltage to optimize battery performance and extend lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If battery management systems use conventional degradation measurement methods, then they can determine degradation ex post facto, but they cannot provide specific information for determining battery state at future time points or predict lifespan
Solution Approach 1:
The patent applies preliminary action by measuring open circuit voltage (OCV) at multiple predetermined time points during charging (when voltage reaches reference charge voltage) before full degradation occurs. This allows the system to proactively detect degradation patterns and predict future battery state, rather than only determining degradation after the fact. The control unit calculates OCV at each time point and uses these preliminary measurements to predict remaining lifespan and provide maintenance recommendations in advance.
Solution Approach 2:
The patent implements feedback by continuously monitoring OCV changes over time and using this information to adjust battery management decisions. The control unit calculates degradation based on OCV differences between time points, feeds this degradation information back into the system, and uses it to determine appropriate charging control conditions. This closed-loop feedback enables accurate prediction of future battery state and allows the system to adapt to degradation patterns.
2Ease of operation
If battery management systems maintain fixed control conditions, then they simplify operation, but they cannot optimize battery performance or extend lifespan as degradation occurs
Solution Approach 1:
The patent applies dynamics by making control conditions adaptive rather than fixed. The control unit determines charging control conditions based on real-time degradation information calculated from OCV measurements. As degradation progresses, the system dynamically adjusts charging parameters such as charging current limits or voltage thresholds, allowing the battery management system to optimize performance and extend lifespan without requiring complex manual intervention. This dynamic adaptation resolves the contradiction between operational simplicity and reliability.
3Measurement precision
If battery management systems measure full charge capacity loss, then they can determine degradation degree, but they cannot provide specific information about degradation rate or predict future battery state
Solution Approach 1:
The patent applies preliminary action by measuring OCV at multiple predetermined time points during the charging process before degradation completes. By taking these preliminary measurements at intervals (when voltage reaches reference charge voltage), the system can calculate the rate of OCV change over time. This provides degradation rate information and enables prediction of future battery state, transforming static degradation measurement into dynamic degradation monitoring that loses no information about degradation progression.
Data Source
AI summary
A battery management apparatus for changing a control condition according to a degradation pattern in a charge situation of a battery cell. Since not only the degradation degree of the battery cell but also the degradation acceleration degree of the battery cell is estimated, the present degradation state of the battery cell may be more accurately estimated, and the future degradation state of the battery cell may also be predicted more accurately.