| abstract |
The invention discloses a composite packaging material for a lithium battery, wherein a protective layer is bonded with an aluminum foil layer by utilizing a polyurethane adhesive layer containing polyhydric phenol hindered phenol. The adhesive layer has good damping characteristic, and can buffer and dissipate the stress applied to the composite packaging material by the stamping equipment, thereby improving the stamping property of the composite packaging material and reducing the damage of the composite packaging material during stamping. The composite packaging material of the invention can provide good interlayer adhesion and stamping ductility, and prevent the protective layer from fatigue damage caused by stress concentration, thereby increasing the stamping depth of the concave part of the composite packaging material. |