Open-Air Battery Emissions Sampling With Funnel Dilution
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Solution Overview
Problem
Existing battery emissions testing equipment struggles to effectively capture and dilute emissions from batteries experiencing thermal runaway in an open air setup, making it challenging to bring emissions into the correct concentration range for measurement.
Innovation Solution
An open air battery emissions dilution and sampling system that includes a sample accumulator with a funneled cavity to capture and dilute emissions with ambient air, and a positive displacement pump or blower to create suction and move the diluted exhaust through tubing for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emissions are captured in an open air setup without enclosure, then measurement safety and equipment simplicity are improved, but emissions concentration becomes too low for accurate measurement
Solution Approach 1:
A dilution air system is introduced as an intermediary between the emissions source and the measurement instrument. Ambient air is drawn through a dilution air inlet and mixed with emissions in a defined mixing zone, creating a diluted sample that is safe for measurement while maintaining detectable concentrations of target compounds
Solution Approach 2:
The concentration parameter of emissions is deliberately changed by introducing dilution air. The system controls the ratio of emissions to dilution air to achieve optimal measurement concentrations, transforming highly concentrated unsafe emissions into safely diluted measurable samples
2Productivity
If a sample accumulator with funneled cavity is used to capture emissions, then emissions capture efficiency is improved, but device complexity increases
Solution Approach 1:
A funneled cavity with curved surfaces is used to capture emissions. The curved geometry naturally directs gas flow toward the sampling inlet, improving capture efficiency while maintaining a relatively simple single-piece structure that integrates the accumulation and mixing functions
3Reliability
If a positive displacement pump is used to create suction and move diluted exhaust, then emissions transport reliability is improved, but device complexity and energy consumption increase
Solution Approach 1:
A positive displacement pump is used to create controlled suction through the sampling system. The pump generates consistent negative pressure to draw dilution air through the funneled cavity and transport diluted emissions through tubing to the measurement instrument, ensuring reliable flow regardless of pressure variations during thermal runaway
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 efficiently captures and dilutes battery emissions during thermal runaway, allowing for accurate measurement and analysis of the diluted exhaust, even in an open air setup.
Implementation Method 1
operation of the positive displacement pump or blower creates suction within the funneled cavity to draw the ambient dilution air into the funneled cavity and move the diluted exhaust through the tubing
Implementation Method 2
captures and dilutes, with the ambient dilution air, emissions from a battery, at least partially disposed within the funneled cavity and experiencing thermal runaway, to form diluted exhaust
Data Source
AI summary
An open air battery emissions dilution and sampling system includes a sample accumulator that defines a funneled cavity having an open end exposed to ambient dilution air and that captures and dilutes with the ambient dilution air emissions from a battery, at least partially disposed within the funneled cavity and experiencing thermal runaway, to form diluted exhaust.