Prismatic Battery Cell Leak Testing With Infrared CO2 Imaging
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Solution Overview
Problem
Existing methods for leak testing prismatic battery cells are inadequate in detecting leaks non-destructively and identifying their locations, which is crucial for ensuring the continuous operation and safety of rechargeable energy storage systems.
Innovation Solution
A non-destructive leak testing system utilizing infrared cameras with CO2 gas delivery and optical filters, along with heated backdrops and mirrors, to pressurize and monitor battery cells at multiple stations, enabling precise detection and location of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional leak testing methods are used, then the testing process is simple, but the ability to detect and locate leaks non-destructively is insufficient
Solution Approach 1:
The testing system is divided into multiple test stations (first test station, second test station) along a conveyor line, with each station equipped with specialized infrared cameras and CO2 delivery systems for specific monitoring tasks. This segmentation allows comprehensive leak detection while maintaining modular complexity management.
Solution Approach 2:
CO2 gas is introduced as an intermediary substance to facilitate leak detection. The gas delivery systems inject CO2 into the battery cells, and infrared cameras detect CO2 leakage through thermal imaging, enabling non-destructive leak location without direct contact with the cell structure.
2Reliability
If multiple test stations are implemented, then leak detection coverage is improved, but the manufacturing process time increases
Solution Approach 1:
The conveyor system enables continuous movement of battery cells through multiple test stations, allowing leak detection to occur continuously during the manufacturing process rather than requiring separate batch testing. This maintains productivity while improving detection reliability through multiple inspection points.
Solution Approach 2:
Leak detection is performed at multiple stages before final assembly and electrolyte filling. The first test station monitors initial leaks, and the second test station provides final verification, ensuring defects are identified early in the manufacturing process when repairs are most efficient.
3Loss of information
If infrared monitoring is used, then leak location identification is enabled, but the system complexity and cost increase
Solution Approach 1:
Traditional mechanical leak detection methods (such as pressure gauges or visual inspection) are replaced with infrared thermal imaging technology. The infrared cameras detect thermal signatures of leaking CO2 gas, providing precise leak location information without mechanical contact or complex disassembly procedures.
Solution Approach 2:
The infrared cameras visualize invisible CO2 gas leaks as thermal patterns or color-coded heat maps, transforming undetectable gas leakage into visible thermal imagery. This allows operators to immediately identify leak locations through thermal contrast between leaking and non-leaking areas.
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
The system effectively identifies and locates leaks in prismatic battery cells, facilitating repair and improving the manufacturing process by ensuring leak-free cells before electrolyte filling, thus enhancing the reliability and safety of rechargeable energy storage systems.
Implementation Method 1
a first infrared camera equipped with a first optical CO2 lens filter... monitoring, via the first infrared camera, an exterior portion of the first portion of the cell and the backdrop to detect presence of CO2 gas
Implementation Method 2
a first infrared camera equipped with a first optical CO2 lens filter
Implementation Method 3
a first backdrop including a first heated surface... monitoring, via the first infrared camera, an exterior portion of the first portion of the cell and the backdrop
Data Source
AI summary
A leak testing system includes a first test station, a second test station, a conveyor, and a controller. The first test station includes a first infrared camera equipped with a first optical CO2 lens filter, a first backdrop including a first heated surface and a first mirror, a first vacuum source, and a first CO2 gas delivery system. The second test station includes a second infrared camera equipped with a second optical CO2 lens filter, a second backdrop including a second heated surface and a second mirror, a second vacuum source, and a second CO2 gas delivery system. The first infrared camera is disposed to monitor a first field of view that includes the first backdrop. The second infrared camera is disposed to monitor a second field of view that includes the second backdrop. The controller includes a cell test procedure that is captured in algorithmic code.