NOVELTY - Battery module (100) comprises: at least one battery cell configured to deliver electric current; and a heat pipe placed in thermal communication with at least one battery cell, where the heat pipe comprises a container, a heat transfer fluid disposed within the container and capable of under going a phase change to absorb at least a portion of heat present within at least one battery cell, and a pressure control device cooperative with the container and heat transfer fluid such that pressure control device allows fluid communication between heat transfer fluid and an ambient environment.    USE - Used as a battery module.    ADVANTAGE - The battery module: prevents the thermal propagation of heat to adjacent cells or other heat-sensitive components; and includes battery cells, which serve as a thermal buffer, thus it achieves reduced power degeneration, improved battery life and durability, improved vehicle range and prevention of thermal runaway.    DETAILED DESCRIPTION - Battery module (100) comprises: at least one battery cell configured to deliver electric current; and a heat pipe placed in thermal communication with at least one battery cell, where the heat pipe comprises a container, a heat transfer fluid disposed within the container and capable of under going a phase change to absorb at least a portion of heat present within at least one battery cell, and a pressure control device cooperative with the container and heat transfer fluid such that pressure control device allows fluid communication between heat transfer fluid and an ambient environment upon reaching a thermal event in at least one battery cell. INDEPENDENT CLAIMS are also included for:    (1) an automobile comprising a propulsion system for providing drive power to the automobile, at least one battery module, which has heat pipe comprising heat transfer fluid, which is released from the heat pipe upon exposure of heat transfer fluid to thermal event produced by at least one battery cell; and    (2) manufacturing a heat pipe system for using in a battery module, comprising adding the heat transfer fluid into heat pipe, and affixing the heat pipe to another structure within heat pipe system such that heat pipe is exposed to a temperature increase which is sufficient to cause thermal event, and is provided with a pressure exerted by heat transfer fluid on heat pipe which exceeds a predetermined threshold, and allows the heat pipe to release at least a portion of heat transfer fluid.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a vehicle (1) with a hybrid propulsion system in the form of a battery pack (10) and an internal combustion engine (20).    Vehicle (1)    Battery pack (10)    Internal combustion engine (20)    Battery module (100)