Meaning
Measurement of the gaseous atmosphere inside a sealed container provides data on the chemical reactions occurring within the liquid or solid contents. In battery testing, headspace gas analysis allows researchers to identify the volatile organic compounds and gases generated during the aging or abuse of electrochemical cells. This technique is used to assess the stability of electrolytes and the effectiveness of safety vents.
Extraction Method
Sampling involves the withdrawal of a small volume of gas from the void above the sample using a syringe or an automated probe. During headspace gas analysis, the temperature of the container is often controlled to ensure that the vapor phase reaches equilibrium with the liquid phase. This standardized environment makes the resulting concentration data comparable across different tests and laboratory conditions.
Component Identification
Gas chromatography combined with mass spectrometry reveals the specific molecules present in the sample. By quantifying the ratio of hydrogen, methane, carbon dioxide and carbon monoxide, headspace gas analysis helps engineers determine the internal temperature and the degree of degradation inside a failed battery pack. These findings guide the development of better thermal management systems and earlier fire detection sensors.
Safety Assessment
Monitoring the accumulation of flammable gases inside storage modules prevents the formation of explosive atmospheres.
