Meaning
Diagnostic techniques of this category monitor the real-time physical expansion and contraction of battery cells during electrochemical cycling. Utilized in development laboratories, in situ dilatometry measures electrode displacement under precise temperature and pressure controls. Sourcing teams use data from this method to evaluate how different chemistry options affect the mechanical design of module and pack enclosures, ensuring long-term structural reliability.
Operational Mechanism
High-resolution sensors monitor the thickness changes of a test cell as it undergoes controlled charge and discharge cycles. The in situ dilatometry system applies a constant force to the cell while recording micrometric shifts in displacement. This measurement correlates electrode phase transitions with voltage profiles.
An exact profile of mechanical breathing is captured.
Technical Benefit
Anode swelling and cathode breathing during cycling can cause internal cell pressure to rise. Employing in situ dilatometry identifies the onset of irreversible cell thickness changes that indicate issues like lithium plating or binder degradation. Early detection of these phenomena avoids expensive design failures later.
Sourcing Value
Pack engineers require precise displacement measurements to design robust module clamping brackets. Through in situ dilatometry, developers obtain the maximum expansion expected over the operating lifetime of a cell. This data optimizes foam thickness.
