Meaning
Physical disassembly process of a battery in a controlled, inert environment is performed to inspect internal components and gather material samples for post-mortem analysis. Performing a cell teardown requires a glove box filled with argon to prevent the reactive lithium and electrolyte from igniting when exposed to moisture and oxygen. Sourcing teams and failure analysis laboratories utilize this procedure to identify the root cause of early cell failure, such as electrode misalignment, current collector corrosion or lithium plating.
Safety Protocol
Discharging the battery to a safe state of charge is the first and most critical step before starting the procedure. If the cell teardown is attempted on a fully charged cell, the risk of a high energy short circuit increases. Technicians use insulated tools and ceramic blades to minimize the risk of accidental electrical bridging.
Internal Inspection
Visual analysis reveals macroscopic defects such as electrode wrinkling, binder dissolution or heavy separator clogging. The physical structure of the winding or stacking is examined for manufacturing defects that could cause local hot spots. These physical findings are matched against the electrochemical test history to correlate cell performance with material changes.
Sample Recovery
Electrode samples are harvested for further chemical testing.
