Battery Cell Gas Pouch Volume Measurement for Formation Quality Control
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Solution Overview
Problem
Current quality control systems for battery cells are time-intensive and data-poor, often requiring destructive testing to analyze the Solid Electrolyte Interphase (SEI) and involving costly inventory holds, while existing methods lack diagnostic and prognostic capabilities.
Innovation Solution
A quality control system that measures the volumetric expansion of a gas pouch during the cell formation process using various measurement instruments such as calipers, strain gauges, carbon coatings, RFID tags, and optical distance sensors to assess the quality of battery cells without destroying them, comparing the measured volume to thresholds to determine a quality score.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If destructive testing is used to analyze the Solid Electrolyte Interphase (SEI), then diagnostic capability is improved, but the battery cell is destroyed and production time is lost
Solution Approach 1:
The patent introduces a gas pouch as an intermediary element that captures gas produced during SEI formation. Instead of directly analyzing the SEI layer (which requires destroying the cell), the system measures gas volume and composition in the pouch, which serves as a proxy indicator of SEI quality and formation process health.
Solution Approach 2:
The patent replaces destructive mechanical analysis (cutting open the cell to examine SEI) with non-destructive measurement techniques. Gas volume is measured using optical sensors or pressure measurements, and gas composition is analyzed through the pouch material, eliminating the need for physical destruction of the battery cell.
2Reliability
If inventory hold and OCV monitoring are performed, then quality assessment is improved, but production downtime and costs increase
Solution Approach 1:
The patent performs quality assessment during the cell formation process itself, rather than after formation. By measuring gas volume and composition in real-time during formation, the system provides preliminary quality indication before the cell enters inventory hold, eliminating the need for extended monitoring periods.
Solution Approach 2:
The system provides immediate feedback on cell quality through gas measurements during formation. This real-time feedback allows for rapid identification of defective cells, enabling quick removal from the formation process and preventing them from entering inventory, thus maintaining productivity while ensuring quality.
3Reliability
If gas pouch expansion is measured, then non-destructive quality assessment is achieved, but measurement precision requirements increase
Solution Approach 1:
The patent transforms the measurement parameter from direct distance measurement to gas volume measurement. By measuring the volume of gas produced (which correlates to SEI formation quality) rather than directly measuring pouch expansion distance, the system reduces measurement precision requirements while maintaining assessment reliability.
Solution Approach 2:
The gas pouch is designed as a composite structure with specific material properties that amplify the measurement signal. The pouch material and configuration are optimized to convert small gas volume changes into measurable physical changes (such as pressure changes or optical property changes), reducing the precision burden on measurement instruments.
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 approach reduces production downtime and costs by providing a non-destructive, diagnostic method for assessing battery cell quality, enabling more efficient production and reducing the need for lengthy inventory holds, while offering a more accurate assessment of battery cell performance based on gas production during the formation process.
Implementation Method 1
a gas pouch (26) configured to expand from a deflated configuration to an inflated configuration as gas is produced during a cell formation process of the battery cell
Implementation Method 2
The measurement instrument is arranged to measure a distance defined by the gas pouch and transmit a signal to the computational system corresponding to the distance. The computational system is arranged to analyze the distance with the processor and determine a volumetric measurement of the gas within the gas pouch
Data Source
AI summary
A quality control system analyzes the quality of a battery cell, with the battery cell defining a gas pouch configured to expand from a deflated configuration to an inflated configuration when filled with a gas formed during a cell formation process. The system comprises a computational system comprising a processor and a memory and a measurement instrument in electronic communication with the computational system. The measurement instrument is arranged to measure a distance defined by the gas pouch and transmit a signal to the computational system corresponding to the distance. The computational system is arranged to analyze the distance with the processor and determine a volumetric measurement of the gas within the gas pouch and compare the volumetric measurement to a threshold in the memory to assess a quality score for the battery cell. A corresponding method analyzes the quality of the battery cell with the quality control system.