Battery Cell Leak Detection Using Trace Gas and Infrared Imaging
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Solution Overview
Problem
Existing battery cell manufacturing processes lack efficient methods for in-line leak detection, particularly of gases and electrolytes, which are crucial for ensuring the integrity and safety of battery cells before and after electrolyte introduction.
Innovation Solution
A system utilizing a movable platform with test stations that inject a trace gas into battery cells and employ an infrared camera to detect leaks, combined with a conveyor system for continuous testing of multiple cells, allowing for rapid assessment of seal integrity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional leak detection methods are used for battery cells, then detection accuracy may be adequate, but productivity is low and manufacturing efficiency is reduced
Solution Approach 1:
The testing system is divided into multiple test stations (first test station, second test station, etc.) arranged along the conveyor path. Each station performs specific testing functions (gas injection, leak detection) on different sections of the battery cell assembly line. This segmentation allows parallel processing of multiple cells simultaneously, increasing productivity from individual cell testing to batch processing while maintaining manageable complexity at each station.
Solution Approach 2:
The patent replaces traditional mechanical leak detection methods with infrared optical detection. An infrared camera detects leak locations by identifying infrared radiation patterns caused by gas escaping from battery cells. This substitution eliminates complex mechanical probing and sealing mechanisms, reducing device complexity while enabling non-contact, high-speed detection that increases productivity to 1,800 cells per hour.
2Productivity
If in-line leak detection is implemented, then manufacturing efficiency improves, but device complexity increases due to multiple test stations and conveyor integration
Solution Approach 1:
The test stations are designed with multi-functionality to handle various testing operations. The first test station performs gas injection through probes, while the second test station performs leak detection using infrared cameras. Both stations can process multiple cell types and configurations. This universality allows a single integrated system to perform multiple functions that would otherwise require separate dedicated devices, improving throughput while controlling overall system complexity.
Solution Approach 2:
The system performs preliminary gas injection into battery cells at the first test station before the cells proceed to the second test station for leak detection. This preliminary action ensures that cells are properly pressurized with test gas before detection begins, enabling continuous in-line testing without interrupting the manufacturing flow. The conveyor system continuously transports cells through the testing sequence, maintaining manufacturing throughput while integrating detection functions.
3Productivity
If rapid scanning of multiple battery cells is performed, then productivity increases to 1,800 cells per hour, but measurement precision may be compromised
Solution Approach 1:
The patent employs infrared cameras to detect leaks optically rather than through mechanical means. The infrared detection system captures thermal radiation patterns from escaping gas, providing precise leak location identification without physical contact. This optical detection method maintains high measurement precision even at scanning speeds of 1,800 cells per hour, as the infrared cameras can rapidly capture and analyze thermal signatures without the mechanical limitations of contact-based detection methods.
Solution Approach 2:
The system changes the detection parameter from mechanical measurement to infrared radiation detection. By monitoring infrared radiation intensity and patterns emitted by leaking gas, the system achieves rapid detection with high precision. The infrared cameras capture thermal signatures that clearly indicate leak presence and location, maintaining measurement accuracy despite the high-speed scanning required for 1,800 cells per hour productivity.
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 high-throughput, in-line leak detection of battery cells, capable of scanning up to 1,800 cells per hour, ensuring the integrity of seals and structural integrity before and after electrolyte addition, enhancing manufacturing efficiency and safety.
Implementation Method 1
a camera adjacent to the movable platform and configured to detect leakage of the gas out from within any of the battery cells
Implementation Method 2
the camera is an infrared camera including a filter configured to block transmission of infrared radiation outside of a wavelength range of 4-5 μm
Implementation Method 3
each one of the plurality of test stations further includes a back plate on a side of the pallet opposite to the camera, the back plate configured as a background radiation source for the camera and configured to be heated to a temperature of 10° C.-30° C. greater than an ambient temperature
Data Source
AI summary
A system configured to test battery cells. The system includes: a movable platform; a plurality of test stations movable by the movable platform, each one of the plurality of test stations configured to cooperate with a pallet on which the battery cells are seated, each one of the plurality of test stations including probes that are movable into cooperation with the battery cells and configured to inject gas into each one of the battery cells; and a camera adjacent to the movable platform and configured to detect leakage of the gas out from within any of the battery cells.