Battery Degradation Diagnosis Using Electrode Profile Maps
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Solution Overview
Problem
Conventional battery diagnosis methods are inaccurate for battery cells containing multiple active materials in the positive or negative electrodes, as they fail to account for the deviation in degradation characteristics, leading to distorted electrode profiles and reduced diagnostic accuracy.
Innovation Solution
A battery diagnosing apparatus and method that generates comparison profiles based on electrode profile maps, adjusting and selecting a second profile to determine diagnostic factors representing the degradation state of battery cells with multiple active materials, using a processor to analyze capacity-voltage relationships and adjust profiles through scaling and shifting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional diagnosis method using overall battery cell profile is applied, then diagnostic process is simple, but diagnostic accuracy is greatly reduced for battery cells with multiple active materials
Solution Approach 1:
The patent segments the overall battery cell profile into individual electrode profiles (positive electrode and negative electrode profiles) by analyzing capacity-voltage relationships. This segmentation allows separate evaluation of each electrode's degradation state, resolving the contradiction by maintaining diagnostic simplicity while improving accuracy through focused analysis of individual electrode characteristics rather than treating the battery as a single unit.
Solution Approach 2:
The patent applies local quality by examining specific local characteristics of electrode profiles (such as voltage plateaus corresponding to specific active materials) rather than relying on the overall battery profile. This enables detection of degradation in specific active materials within electrodes, improving diagnostic accuracy while maintaining a systematic approach to analysis.
2Stability of the object's composition
If battery cell degrades with multiple active materials in electrodes, then capacity-voltage relationship becomes distorted, but conventional methods assume profile remains similar to release state
Solution Approach 1:
The patent introduces dynamics by creating multiple comparison profiles representing different degradation states of electrodes, rather than assuming a static reference profile. The system dynamically selects the most appropriate comparison profile based on the actual battery state, allowing accurate degradation assessment even when significant profile distortion occurs due to multiple active materials degrading at different rates.
Solution Approach 2:
The patent applies parameter changes by transforming the capacity-voltage relationship data into electrode-specific profiles and comparing them against a library of reference profiles with varying degradation parameters. This allows the system to accommodate and accurately measure profile distortions caused by parameter changes in multiple active materials during degradation.
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 at least two kinds of active materials, 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. The processor is configured to determine at least one diagnostic factor representing a degradation state of the battery cell based on the second profile.