Battery Degradation Diagnosis Using Multi-Phase Electrode Profiles
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Solution Overview
Problem
Conventional battery diagnostic methods are inaccurate for battery cells with multi-phase characteristics, leading to significant degradation in diagnosis accuracy as the multi-phase characteristic changes over time, distorting the overall electrode design.
Innovation Solution
A battery diagnosing apparatus and method that generates comparison profiles based on electrode profile maps, using a processor to determine diagnostic factors like positive and negative electrode scale factors by comparing capacity-voltage relationships, adjusting profiles, and limiting voltage and State of Charge ranges for precise degradation state assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic methods are used for battery cells with multi-phase characteristics, then the diagnostic method is simple to implement, but the diagnosis accuracy greatly degrades as the battery cell degrades and multi-phase characteristics change
Solution Approach 1:
The patent segments the battery electrode profile analysis into multiple distinct phases (first phase, second phase, third phase) with different characteristics. Each phase is analyzed separately using phase-specific reference profiles, allowing accurate diagnosis even when the overall electrode design distorts due to degradation. This segmentation enables the system to handle multi-phase characteristics without requiring complex overall profile matching.
Solution Approach 2:
The patent changes the diagnostic parameter from overall electrode profile matching to phase-specific profile matching. By identifying and separating different phases based on their distinct voltage-capacity characteristics, the system adapts the diagnostic parameters to account for degradation-induced changes in multi-phase characteristics, thereby maintaining high diagnosis accuracy.
2Reliability
If conventional diagnostic methods are applied to battery cells with multi-phase characteristics, then the initial diagnosis may be accurate, but the accuracy greatly degrades over time as the multi-phase characteristic changes
Solution Approach 1:
The patent performs preliminary phase identification and separation before conducting the diagnostic comparison. By预先 identifying the different phases and their characteristics in the battery electrode profile, the system prepares phase-specific reference profiles that can accurately match degraded states. This preliminary action ensures that even as the battery ages and phases evolve, the diagnostic system remains reliable.
Solution Approach 2:
The patent implements a feedback mechanism where the diagnosed degradation state informs the selection and adjustment of reference profiles for subsequent diagnoses. As the battery undergoes multiple charge-discharge cycles and degradation progresses, the system uses feedback from previous diagnoses to update and refine the phase-specific reference profiles, maintaining diagnostic reliability throughout the battery's lifespan.
Data Source
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AI summary
Disclosed is a battery diagnosing apparatus and a battery diagnosing method. The battery diagnosing apparatus includes a data obtaining unit configured to obtain a first profile representing a capacity-voltage relationship of a battery cell containing an active material with a multi-phase characteristic, and a processor configured to generate a plurality of comparison profiles based on a plurality of electrode profiles included in an electrode profile map. The processor is configured to select, as a second profile, one comparison profile from the plurality of comparison profiles by comparing each of the plurality of comparison profiles with the first profile, and determine a positive electrode scale factor as a diagnostic factor representing a degradation state of the battery cell based on the second profile.