Battery Degradation Detection Using Differential Capacity Peaks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems fail to accurately judge the degree of battery degradation, limiting their ability to effectively extend the lifespan of batteries.
Innovation Solution
A battery management apparatus and method that analyzes voltage and differential capacity patterns in battery profiles to determine if degradation is accelerated, using reference patterns to identify peak changes and set discharge end voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery inspection methods are used to detect abnormality, then the system can identify defective batteries, but it cannot accurately judge the degree of degradation or accelerate lifespan extension
Solution Approach 1:
The patent segments the battery inspection process into multiple distinct stages: obtaining differential profiles at different cycles, selecting peaks from each profile, determining voltage and differential capacity change patterns for peak pairs, and comparing against reference patterns. This segmentation allows comprehensive degradation assessment without requiring a single complex inspection system.
Solution Approach 2:
The patent introduces a new dimension of analysis by examining differential profiles across multiple charge-discharge cycles rather than relying on single-point measurements. By analyzing voltage and differential capacity changes across cycles and comparing peak patterns, the system achieves accurate degradation detection without excessive complexity.
2Reliability
If the battery management system monitors detailed voltage and capacity patterns across multiple cycles, then it can accurately determine degradation acceleration, but the computational complexity and data processing requirements increase
Solution Approach 1:
The patent extracts key diagnostic information by selecting specific peaks from differential profiles and focusing analysis on voltage and differential capacity changes between peak pairs. This extraction approach allows accurate degradation assessment by concentrating on the most informative features rather than processing all raw data.
Solution Approach 2:
The patent performs preliminary actions by obtaining and storing differential profiles at different cycles before degradation becomes severe. These pre-collected data serve as reference patterns that simplify subsequent degradation assessment, allowing the system to compare current states against established baselines without real-time complexity.
3Loss of information
If the system only detects binary abnormality states, then the inspection process remains simple, but it cannot provide the granular degradation information needed for lifespan optimization
Solution Approach 1:
The patent applies local quality by analyzing specific regions of the differential profiles - particularly focusing on peak characteristics within defined voltage ranges. By examining voltage and differential capacity changes at specific peak locations rather than the entire profile, the system achieves comprehensive degradation information with manageable measurement complexity.
Solution Approach 2:
The patent utilizes parameter changes by monitoring variations in voltage and differential capacity values across multiple cycles. By tracking how these parameters evolve and comparing them against reference patterns, the system captures complete degradation state information while maintaining clear measurement criteria through standardized parameter comparison.
Data Source
AI summary
A battery management apparatus and method performs appropriate control to increase the lifespan of a battery cell by judging whether degradation of the battery cell is accelerated. Since both the voltage change pattern and the differential capacity change pattern between the plurality of peaks included in the plurality of differential profiles are considered, there is an advantage that it is possible to accurately determine whether the state of the battery cell is in a degradation accelerated state.