Battery Charging Control for Lithium Plating Diagnosis
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Solution Overview
Problem
Existing methods fail to accurately diagnose lithium precipitation in batteries, especially when it occurs gradually, posing risks of battery degradation, internal short circuits, and potential explosions.
Innovation Solution
A battery management apparatus and method that extracts inflection points from voltage changes over time, determines target and reference voltages based on temperature and current, and diagnoses lithium precipitation by comparing these values using a voltage table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage change over time is used to diagnose lithium precipitation, then large amounts of lithium precipitation can be detected, but gradual lithium precipitation cannot be accurately diagnosed
Solution Approach 1:
The patent changes the diagnostic parameter from simple voltage change over time to inflection point voltage characteristics. By analyzing the inflection point voltage (the voltage at which the rate of voltage change is maximum) during charging, the system can detect gradual lithium precipitation that accumulates over multiple charge cycles, rather than requiring large amounts of precipitation to be present at once.
Solution Approach 2:
The patent establishes a voltage table in advance that stores the relationship between inflection point voltage, temperature, and current. This preliminary action allows the system to compare real-time inflection point measurements against pre-established reference values, enabling accurate detection of gradual lithium precipitation by identifying deviations from normal voltage characteristics before significant degradation occurs.
2Ease of manufacture
If conventional voltage change monitoring is used, then simple implementation is achieved, but accurate diagnosis of gradual lithium precipitation is not possible
Solution Approach 1:
The patent transforms the diagnostic approach by focusing on inflection point voltage characteristics rather than simple voltage monitoring. This parameter change maintains implementation simplicity through automated calculation of inflection points from voltage-time data while significantly improving detection accuracy for gradual lithium precipitation.
Solution Approach 2:
The patent introduces a voltage table as an intermediary that stores pre-established relationships between inflection point voltage, temperature, and current. This intermediary enables accurate diagnosis by providing reference values for comparison, bridging the gap between simple measurement and complex analysis while maintaining system implementability.
Data Source
AI summary
A battery management apparatus according to an embodiment of the present disclosure includes an inflection point extracting unit configured to extract an inflection point from a battery profile representing a voltage change of a battery over time; and a control unit configured to determine a target voltage, a target temperature, and a target current amount of the battery corresponding to the inflection point, determine a reference voltage corresponding to the target temperature and the target current amount in a preset voltage table, and diagnose whether or not lithium precipitation occurs in the battery based on the reference voltage and the target voltage.