Dynamic Core Temperature Reconstruction for Transient Swelling Deconvolution in Prismatic Modules
Deconvoluting swelling requires dynamic internal thermal reconstruction to separate reversible expansion from heat driven volume growth.
Thermomechanical Transfer Function
Meaning
Mathematical model defining the relationship between temperature changes and the resulting mechanical stress or strain within a battery cell. Using a thermomechanical transfer function predicts how rapid temperature spikes translate into physical strain on the casing or internal components. This allows for the design of hardware that can withstand the rigors of high power operation.
Mechanical Stress
Displacement occurs whenever the material properties of the cell change with heat. The thermomechanical transfer function quantifies how quickly the expansion happens relative to the speed of the temperature rise.
Cyclic Fatigue
Repetitive loading often leads to failure in the cell interconnects or housing seals. By applying the thermomechanical transfer function to expected drive cycles, engineers can estimate the time to failure for a specific pack design. This analysis shows whether a cooling system is sufficient to prevent the stress levels from exceeding the elastic limit of the materials.
Accurate modeling reduces the need for destructive physical testing during the development phase of new battery modules.
Model Boundary
Calculation validity depends on the specific clamping force and environmental constraints of the pack. A different thermomechanical transfer function is required for every unique geometry or material combination used in the assembly.