Cell Module Gas Sensing for Fast Damaged Cell Localization
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Solution Overview
Problem
Existing methods for inspecting battery cell module assemblies struggle to accurately and rapidly detect damaged cells with defective pouches and their corresponding positions within the assembly, leading to difficulties in sorting and replacing defective cells during the manufacturing process.
Innovation Solution
A gas detection apparatus and method for cell module assemblies, featuring a gas detection chamber, sliding die, and multiple gas sensors positioned to correspond with each cell in the assembly. The apparatus includes a gas circulator and press to facilitate gas detection and cell positioning, allowing for accurate identification of damaged cells and their locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray inspection is used to detect damaged pouches, then detection capability is improved, but process complexity and equipment requirements increase
Solution Approach 1:
The patent replaces the mechanical/X-ray inspection system with a gas detection system that uses gas sensors to detect leaked electrolyte. The gas circulator creates airflow to carry gas molecules from damaged cells to sensors, enabling detection without complex imaging equipment. This substitutes a simple gas detection mechanism for the complex X-ray system.
Solution Approach 2:
The patent introduces gas (specifically, electrolyte vapor or leaked gas) as an intermediary medium to indicate cell damage. Instead of directly imaging the pouch damage, the system detects the presence of gas molecules that escape from damaged cells, using the gas as a mediator between the damaged cell and the detection system.
2Device complexity
If visual inspection is used to check welded portions, then equipment simplicity is maintained, but detection reliability decreases
Solution Approach 1:
The patent replaces visual inspection with automated gas detection using sensors. The gas circulator system actively transports gas molecules to sensor locations, enabling reliable detection of damaged cells without human visual inspection. This maintains equipment simplicity while dramatically improving reliability through automated chemical sensing.
Solution Approach 2:
The patent employs gas sensors that detect changes in gas composition or concentration as indicators of cell damage. The sensors respond to the presence of electrolyte vapor or leaked gas by changing their electrical properties, providing an automated signal for damaged cell identification without requiring visual observation.
3Device complexity
If gas detection is performed without gas circulation, then device simplicity is maintained, but detection speed and accuracy decrease
Solution Approach 1:
The gas circulator operates in periodic cycles, creating controlled airflow patterns that systematically move gas molecules from cell locations to sensor positions. This periodic circulation ensures that gas from damaged cells is periodically delivered to detectors, enabling rapid detection without requiring continuous complex gas flow management.
Solution Approach 2:
The patent introduces dynamic gas circulation instead of static detection. The gas circulator creates moving airflow that actively transports gas molecules, transforming the detection process from a passive waiting state to an active dynamic system. This dynamic approach significantly accelerates detection speed while adding only a single circulator component.
4Measurement precision
If multiple gas sensors are positioned to correspond with each cell, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the detection system into discrete sensor units, each corresponding to a specific cell position. This segmentation allows precise identification of which cell is damaged by determining which sensor detects the gas. The gas circulator directs gas flow to specific sensor zones, enabling cell-by-cell detection precision without requiring a single complex omnidirectional sensor.
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
Enables accurate and rapid detection of damaged cells with defective pouches within the cell module assembly, facilitating efficient sorting and replacement of defective cells, thereby reducing the defect rate of cell module assemblies during production.
Implementation Method 1
a plurality of gas sensors disposed at positions corresponding to positions of the plurality of cells
Implementation Method 2
The gas detection apparatus may further include a gas circulator provided in the gas detection chamber
Data Source
AI summary
A gas detection apparatus for cell module assemblies accurately and rapidly detects a damaged cell of a cell module assembly and the damaged position of the damaged cell. The gas detection apparatus includes a gas detection chamber configured to receive a cell module assembly; and a sliding die configured to be movable to the lower part of the gas detection chamber in the state in which the cell module assembly is disposed at the upper end thereof. The gas detection apparatus further includes a gas sensor provided in the gas detection chamber, the gas sensor including a plurality of gas sensors disposed so as to correspond to positions of cells of the cell module assembly. A gas detection method for cell module assemblies uses the gas detection apparatus for cell module assemblies.