Meaning
Mechanical representation of viscoelastic behaviors through parallel combinations of spring-dashpot elements enables the prediction of stress relaxation in polymers over time. Within the battery pack, the generalized maxwell model simulates how elastomeric compression pads relax after being squeezed during cell installation. This simulation helps engineers predict whether the clamping force will remain sufficient to prevent cell movement throughout the life of the vehicle.
The boundary of the model occurs under extremely high strain rates where non-linear polymer responses dominate.
Viscoelastic Analysis
Relaxation curves derived from this approach assist in selecting materials that will not lose their holding force prematurely. An accurate generalized maxwell model allows designers to run virtual aging cycles of the pack under varying temperature profiles. This analysis prevents expensive physical testing protocols.
Mathematical Structure
The formulation utilizes a series of Maxwell elements, each representing a distinct relaxation time, connected in parallel with a single elastic spring.
Material Selection
Sourcing departments use the output parameters to compare the long-term load retention of different foam pads. While some inexpensive foams exhibit rapid force decay, others maintain high residual forces due to slower relaxation rates. By applying these model parameters to the sourcing sheet, the team ensures that the selected pad holds the cell securely.
This specification protects the battery cells from damage during shock events.
