Production Method for Battery Pack Encapsulated Thermal Insulation Pads

A method of making an anti-thermal propagation cell includes providing a longitudinal base film web with first and second sides, the first side having an adhesive layer. A plurality of insulation pads, each with top and back faces, front and back edges, and left and right sides, is provided. The back face of an insulation pad is attached to the first side of the base film web so that left and right base film strips remain free. The left strip is folded over the left side and part of the top face, and the right strip is folded over the right side and part of the top face. A lidding film web with first and second sides, the first side having an adhesive layer, is provided. The first side of the lidding film web is attached to portions of the top face and the folded base film strips.