Battery Diagnosis Using Overpotential-Corrected Profiles
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Solution Overview
Problem
Existing battery diagnosis methods require low-rate charge and discharge to accurately reflect the battery state, limiting the ability to diagnose accurately when overpotential is present, especially at higher C-rates.
Innovation Solution
An apparatus and method that corrects battery profiles by removing overpotential using a preset overpotential profile, generating adjusted positive and negative electrode profiles, and diagnosing battery state based on extracted diagnosis factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If low-rate charge and discharge is used to obtain accurate battery profiles, then measurement precision is improved, but productivity deteriorates due to extended testing time
Solution Approach 1:
The patent pre-calculates and stores overpotential profiles for various C-rates before actual battery testing. These pre-computed correction profiles are then applied during rapid high-rate charge/discharge testing to eliminate the need for time-consuming low-rate characterization, thus achieving both speed and accuracy
Solution Approach 2:
The patent transforms the battery profile measurement from direct low-rate testing to a corrected high-rate measurement approach. By changing the measurement parameters (using high C-rate with overpotential correction instead of low C-rate without correction), the system achieves faster testing while maintaining profile accuracy
2Productivity
If high C-rate charge and discharge is used to improve productivity, then diagnosis speed is improved, but measurement precision deteriorates due to overpotential effects
Solution Approach 1:
The patent extracts and separates the overpotential component from the total voltage measurement during high-rate charge/discharge. By identifying and removing the overpotential effect through subtraction using pre-stored correction profiles, the system recovers the accurate battery state information that would otherwise be obscured by high-rate effects
Solution Approach 2:
The patent introduces overpotential correction profiles as an intermediary element between the high-rate battery testing and the final accurate state determination. These correction profiles act as a mediator that translates high-rate measurements into accurate low-rate equivalent profiles, enabling both speed and precision
3Measurement precision
If overpotential correction is applied to maintain measurement precision, then battery profile accuracy is improved, but device complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent performs the complex overpotential profile calculations and storage setup in advance, before actual battery diagnosis. This preliminary preparation moves the complexity from the operational phase to the setup phase, allowing the actual diagnosis to proceed rapidly with simple correction applications
Solution Approach 2:
The patent transforms the complexity from real-time calculations during testing to pre-computed parameter storage. By changing from dynamic correction calculations to static profile lookups and subtractions, the system reduces operational complexity while maintaining correction accuracy
Data Source
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AI summary
The present disclosure relates to an apparatus and method for diagnosing a battery, which may diagnose a state of a battery in consideration of an overpotential. The apparatus and method for diagnosing a battery according to the present disclosure have an advantage in that charging and discharging at a criterion C-rate is not forced to diagnose the state of the battery because the state of the battery is diagnosed based on a corrected profile in which overpotential is removed from the battery profile.