▎ 摘　　要

NOVELTY - The system comprises a battery cell (100) and a graphene layer (150) are positioned on an outer surface of the battery cell. The battery cell provides a side wall, a first end wall, and a second end wall, and where the graphene layer is positioned on the outer surface of the side wall. The graphene layer is positioned on the outer surface of the side wall that increases a strength of the side wall, and hence reduces a likelihood that the side wall ruptures during a thermal runaway event. The graphene layer is not positioned on the outer surface of the first end wall, and hence increases a likelihood that the first end wall ruptures during the thermal runaway event. USE - System for improving lithium-ion battery cells during thermal runaway. ADVANTAGE - System reduces the effectiveness of a battery passive thermal control system such that the system warms faster and/or operate more moderate temperatures in a cold environment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for improving lithium-ion battery cells during thermal runaway. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a battery cell including a graphene layer. Battery cell (100) Cylindrical Side wall (110) Upper end wall (120) Lower axial end wall (130) Graphene layer (150)