System and method for quantitatively measuring gases generated by a battery cell or battery cell component as a function of time during testing

A system for measuring gases in a battery cell, comprising:

• a chamber including a cavity configured to receive a test sample, wherein the test sample comprises one of:
• a battery cell including terminals and a gas port;
• and
• a test fixture including terminals and a gas port and housing at least a portion of a battery cell;
• a check valve including a first port connected to the gas port of the battery cell and a second port connected to a node;
• a first gas source supplying a carrier gas to the node including an inert gas and a reference gas having a predetermined concentration;
• and
• at least one of a mass spectrometer and a gas analyzer configured to sample gas at the node and to determine a concentration of one or more gases in the battery cell as a function of time using the mass spectrometer.