Definitions for "Thermal runaway"
A critical condition arising during constant voltage charging in which the current and the temperature of the battery produce a cumulative mutually-reinforcing effect which further increases them and can lead to the destruction of the battery.
A conduction that exists when heat causes more electron-hole pairs to be generated, which, in turn, causes more heat and which may eventually cause diode destruction.
In batteries. Can occur if rating capacities are exceeded. Involves violent gassing, boiling of the electrolyte, damage to the plates and even melting of the battery case or explosion.
Keywords:  wildly, suddenly, goes, curve, smooth
a reaction that suddenly switches from a smooth curve and goes wildly out of control