Secondary Battery Tab Position Tracking for Deformation Analysis
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Solution Overview
Problem
Existing methods for analyzing secondary battery deformation, such as destructive disassembly, are inadequate as they cause damage and fail to accurately determine the cause of performance deterioration and deformation trends over charging and discharging cycles.
Innovation Solution
A non-destructive deformation analysis method using computed tomography (CT) imaging to obtain images of the secondary battery before and after deterioration, calculating the position of the tab in the electrode assembly, and determining deformation by comparing the change in tab position to a reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive disassembly methods are used to analyze battery deformation, then detailed internal structure information can be obtained, but the battery is damaged and actual deformation causes cannot be determined
Solution Approach 1:
The patent replaces mechanical disassembly with X-ray CT imaging technology. The CT scanner captures three-dimensional images of the battery's internal structure non-destructively, allowing measurement of electrode assembly deformation, tab position changes, and case expansion without physical contact or disassembly. This substitution resolves the contradiction by providing precise deformation measurements while maintaining battery integrity.
Solution Approach 2:
The patent introduces an intermediary measurement system consisting of external markers or reference objects placed around the battery during CT imaging. These intermediaries provide reference points for accurately measuring deformation without touching or damaging the battery, enabling precise quantification of dimensional changes while preserving battery integrity.
2Loss of information
If destructive analysis methods are used, then internal structure can be examined, but it becomes difficult to determine the actual cause of performance deterioration
Solution Approach 1:
The patent performs CT imaging at multiple stages before failure occurs - initially, after a certain number of charge-discharge cycles, and near the end of battery life. This preliminary action captures the progressive development of deformation, allowing researchers to identify when and how deformation begins, progresses, and correlates with performance deterioration, thereby determining actual causes without destructive disassembly.
Solution Approach 2:
The patent enables continuous or periodic monitoring of battery deformation through repeated non-destructive CT imaging throughout the battery's operational life. This continuous observation captures the dynamic process of deformation development, maintaining complete information about deformation evolution while preserving the battery for further testing and analysis.
3Measurement precision
If the battery is disassembled for analysis, then internal components can be inspected, but the analysis is limited in identifying deterioration trends over charging and discharging cycles
Solution Approach 1:
The patent replaces time-consuming manual disassembly and inspection with automated X-ray CT imaging and image processing. The CT scanner rapidly captures three-dimensional images, and software automatically measures deformation, calculates dimensional changes, and generates analysis reports. This substitution dramatically improves productivity by eliminating labor-intensive disassembly while maintaining complete internal structure visibility.
Solution Approach 2:
The patent implements automated image processing algorithms that automatically detect electrode assembly boundaries, measure deformation, calculate tab position changes, and generate deformation maps without human intervention. This self-service capability processes multiple batteries efficiently, significantly improving analysis productivity while providing comprehensive internal structure information.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for accurate, non-destructive analysis of secondary battery deformation, enabling the determination of electrode assembly deformation without disassembling the battery, thus providing insights into performance deterioration and charging/discharge cycle trends.
Implementation Method 1
obtaining a first image by performing computed tomography (CT) imaging on the secondary battery
Data Source
AI summary
A method and device for analyzing deformation of a secondary battery having an electrode assembly with a tab received in a case, the deformation analysis method including obtaining a first image by performing computed tomography (CT) imaging on the secondary battery, calculating a first position of the tab from the first image, obtaining a number of charge and discharge cycles of the secondary battery after charging and discharging the secondary battery multiple times so that the secondary battery deteriorates, obtaining a second image by performing CT imaging on the secondary battery deteriorated, calculating a second position of the tab from the second image and determining that the electrode assembly is deformed if an amount of change between the first position and the second position is greater than a reference value.