Meaning
Spatial distribution measurement of mechanical force across the surface of a cell reveals localized high-stress zones. This imaging technique, known as tactile pressure mapping, uses thin, sensor-filled sheets placed between the cell and the compression plate. It provides real-time pressure data that allows engineers to evaluate the uniform support of the cell.
Sensor Technology
Piezoresistive or capacitive sensor arrays are integrated into a thin polymer sheet that fits within the module assembly. During cell charging, these arrays measure the local force variations, enabling tactile pressure mapping of the contact area. This high-resolution data shows where the pressure concentrates due to manufacturing tolerances or cell bulging.
Pressure Uniformity
Uniform compression prevents the creation of dry areas in the cell separator, where the liquid electrolyte has been squeezed out. Using tactile pressure mapping, engineers can confirm that the compression pad distributes the force evenly across the entire face of the cell, avoiding localized stress spots that lead to premature cell failure.
Sourcing Value
Sourcing managers utilize this pressure data to select the most effective elastomeric materials from foam suppliers. By comparing the pressure maps of different candidate foams, the procurement team can select the grade that maintains uniform pressure over the lifetime of the battery module. This selection ensures high performance of the battery pack while avoiding over-specifying expensive material options.
