Battery Management Using Voltage Deviation for Lithium Plating Detection
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Solution Overview
Problem
Existing methods for diagnosing lithium precipitation in batteries are inaccurate when the precipitation occurs gradually, and there is a need for a technology that can accurately detect lithium precipitation even in early stages.
Innovation Solution
A battery management apparatus and method that diagnoses lithium precipitation based on a voltage deviation between a reference voltage and a target voltage, using a voltage table that considers temperature and current amount, and determines a reference voltage through interpolation or nearest values to accurately identify inflection points in battery profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage change over time is used to diagnose lithium precipitation, then diagnosis can be performed when large amount of precipitation occurs, but diagnosis accuracy deteriorates when precipitation accumulates gradually
Solution Approach 1:
The patent changes the diagnostic parameter from simple voltage change over time to voltage deviation from a reference profile at specific time points. By comparing actual voltage values with reference voltage values obtained through interpolation, the system can detect even gradual lithium precipitation that was previously undetectable using conventional voltage change methods
Solution Approach 2:
The patent creates a reference voltage profile through interpolation of measured voltage data at different states of charge. This reference profile serves as a template for comparison, allowing the system to identify deviations caused by lithium precipitation. The copying approach enables detection by comparing current voltage behavior against an idealized reference pattern
2Ease of manufacture
If conventional voltage change method is used, then diagnosis is simple to implement, but it cannot detect gradual lithium precipitation accumulation
Solution Approach 1:
The patent performs preliminary interpolation to generate reference voltage values before conducting the actual diagnosis. By pre-calculating and storing reference voltage profiles corresponding to different states of charge, the system simplifies the real-time diagnostic process while maintaining high accuracy. This preliminary action prepares the reference framework needed for accurate comparison
Solution Approach 2:
The patent introduces interpolated reference voltage values as an intermediary between raw voltage measurements and precipitation diagnosis. These reference values act as a mediator that translates complex voltage-time relationships into comparable deviations, making the diagnosis both accurate and computationally manageable
Data Source
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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.