Predictive Modeling of Creep Driven Pore Growth under Cyclic High Temperature Tooling Loads
Predictive creep modeling quantifies elevated temperature pore evolution in solid state cell tooling to establish precise hold times and prevent yield loss.
Mechanical Dwell Cycling
Meaning
Stress testing protocol that incorporates a specific hold period at peak load or displacement to evaluate the creep and relaxation behavior of a material. Mechanical dwell cycling reveals how battery pack structural adhesives and seals perform under sustained operational pressure. It identifies potential fatigue points that standard rapid cycling might miss.
Testing Procedure
Applying a load and holding it for a fixed duration simulates the static stresses encountered during vehicle charging or storage. During mechanical dwell cycling the test equipment monitors the decay of force or the gradual increase in strain. These hold periods range from minutes to several hours depending on the material specification.
Failure Mechanism
Repeated loading followed by static holds causes molecular rearrangement in polymers used for cell bonding. If mechanical dwell cycling triggers premature debonding, the assembly process requires modification to include more resilient materials. The technique exposes weaknesses in the bond line.
Data Acquisition
Software records the relationship between time and deformation to calculate the relaxation modulus of the assembly. This mechanical dwell cycling data allows engineers to predict the long term integrity of the battery enclosure over a ten year service life. Precise sensors track sub micron shifts during the hold phase.
The resulting curves indicate whether the material will stabilize or continue to deform until the structural seal fails.