Abstract: An electronic vapor provision device comprises: includes a first electrical resistive heater for vaporizing a precursor material to generate vapor in an airflow for inhalation by a user and a second electrical resistive heater for vaporizing the precursor material and/or heating said airflow. The first electrical resistive heater has a first thermal coefficient of resistance which is less than a second thermal coefficient of resistance of the second electrical resistive heater. The device further includes a control system to monitor for a change in the resistance of at least the second electrical resistive heater. The second electrical resistance heater therefore serves both as a heater and as a temperature monitor.

Abstract: A vapor provision system includes a reservoir defining a storage volume to hold aerosolizable substrate material; and an aerosolizable substrate material detection system including an optical source located externally of the reservoir and operable to emit light into the storage volume; an optical detector located externally of the reservoir and operable to detect light emitted by the optical source that has traversed an optical path through the storage volume; and a controller configured to determine a characteristic of light detected by the optical detector and deduce information regarding a depth of aerosolizable substrate material in the storage volume from the determined characteristic of the light.

Abstract: A control unit for an electronic vapor provision system includes a battery for providing electrical power to a heater which is used to produce vapor. The battery is a lithium iron phosphate battery. The battery provides an output voltage which remains at an approximately constant voltage level as the battery is discharged.

Abstract: A liquid storage tank of an electronic vapor provision device includes one or more boundary walls defining an interior volume of the tank for accommodating source liquid to be vaporized in the electronic vapor provision device; and one or more baffles, each baffle protruding from an inner surface of the boundary wall into the interior volume to impede a flow of source liquid between portions of the interior volume between which the baffle is located. The tank may be included in an electronic vapor provision device or in a component for an electronic vapor provision device such as a cartomizer.

Abstract: A control unit for an electronic vapor provision system includes a battery for providing electrical power to a heater which is used to produce vapor. The battery is a lithium iron phosphate battery. The battery provides an output voltage which remains at an approximately constant voltage level as the battery is discharged.

Abstract: An electronic vapor provision device comprises: includes a first electrical resistive heater for vaporizing a precursor material to generate vapor in an airflow for inhalation by a user and a second electrical resistive heater for vaporizing the precursor material and/or heating said airflow. The first electrical resistive heater has a first thermal coefficient of resistance which is less than a second thermal coefficient of resistance of the second electrical resistive heater. The device further includes a control system to monitor for a change in the resistance of at least the second electrical resistive heater. The second electrical resistance heater therefore serves both as a heater and as a temperature monitor.

Abstract: An electronic vapor provision device includes a first electrical resistive heater for vaporizing a precursor material to generate vapor in an airflow for inhalation by a user and a second electrical resistive heater for vaporizing the precursor material and/or heating said airflow. The first electrical resistive heater has a first thermal coefficient of resistance which is less than a second thermal coefficient of resistance of the second electrical resistive heater. The device further includes a control system to monitor for a change in the resistance of at least the second electrical resistive heater. The second electrical resistance heater therefore serves both as a heater and as a temperature monitor.

Abstract: An electronic aerosol provision system includes a vaporizer for generating an aerosol using electrical power; a battery for supplying electrical power to the vaporizer and to other components of the electronic aerosol provision system; a flat, flexible cable having a laminated structure and incorporating multiple conductor lines for transmitting electrical power and/or signals; and a temperature sensor incorporated into the flat, flexible cable and located adjacent the battery for sensing the temperature of the battery. The electronic aerosol provision system is configured to detect an error condition if the sensed temperature of the battery goes outside a specified operating range; and in response to such detection, to reduce or cease the supply of electrical power from the battery.

Abstract: A cartomizer for a vapor provision system, the cartomizer including: a container for holding a reservoir of free liquid to be vaporized; an atomizing chamber; a porous wick extending from inside the container, through an aperture in a wall of the atomizing chamber, to inside the atomizing chamber in order to convey the liquid from the reservoir to the inside of the atomizing chamber for vaporization; and a resilient seal provided in the aperture to restrict the liquid from entering the atomizing chamber from the reservoir except by travelling along the wick.

Abstract: A control unit for an electronic vapor provision system includes a battery for providing electrical power to a heater which is used to produce vapor. The battery is a lithium iron phosphate battery. The battery provides an output voltage which remains at an approximately constant voltage level as the battery is discharged.

Abstract: A vapor provision system includes a reservoir defining a storage volume to hold aerosolizable substrate material; and an aerosolizable substrate material detection system including an optical source located externally of the reservoir and operable to emit light into the storage volume; an optical detector located externally of the reservoir and operable to detect light emitted by the optical source that has traversed an optical path through the storage volume; and a controller configured to determine a characteristic of light detected by the optical detector and deduce information regarding a depth of aerosolizable substrate material in the storage volume from the determined characteristic of the light.

Abstract: A control unit for an electronic vapor provision system includes a battery for providing electrical power to a heater which is used to produce vapor. The battery is a lithium iron phosphate battery. The battery provides an output voltage which remains at an approximately constant voltage level as the battery is discharged.

Abstract: An electronic aerosol provision system includes a vaporizer for generating an aerosol using electrical power; a battery for supplying electrical power to the vaporizer and to other components of the electronic aerosol provision system; a flat, flexible cable having a laminated structure and incorporating multiple conductor lines for transmitting electrical power and/or signals; and a temperature sensor incorporated into the flat, flexible cable and located adjacent the battery for sensing the temperature of the battery. The electronic aerosol provision system is configured to detect an error condition if the sensed temperature of the battery goes outside a specified operating range; and in response to such detection, to reduce or cease the supply of electrical power from the battery.

Abstract: An electronic vapour provision device comprises: a first electrical resistive heater for vaporising a precursor material to generate vapour in an airflow for inhalation by a user and a second electrical resistive heater for vaporising the precursor material and/or heating said airflow. The first electrical resistive heater has a first thermal coefficient of resistance which is less than a second thermal coefficient of resistance of the second electrical resistive heater. The device further includes a control system to monitor for a change in the resistance of at least the second electrical resistive heater. The second electrical resistance heater therefore serves both as a heater and as a temperature monitor.

Abstract: A liquid storage tank of an electronic vapor provision device includes one or more boundary walls defining an interior volume of the tank for accommodating source liquid to be vaporized in the electronic vapor provision device; and one or more baffles, each baffle protruding from an inner surface of the boundary wall into the interior volume to impede a flow of source liquid between portions of the interior volume between which the baffle is located. The tank may be included in an electronic vapor provision device or in a component for an electronic vapor provision device such as a cartomizer.

Abstract: A cartomiser for a vapour provision system, the cartomiser including: a container for holding a reservoir of free liquid to be vaporised; an atomising chamber; a porous wick extending from inside the container, through an aperture in a wall of the atomising chamber, to inside the atomising chamber in order to convey the liquid from the reservoir to the inside of the atomising chamber for vaporisation; and a resilient seal provided in the aperture to restrict the liquid from entering the atomising chamber from the reservoir except by travelling along the wick.

Abstract: A control unit for an electronic vapor provision system includes a battery for providing electrical power to a heater which is used to produce vapor. The battery is a lithium iron phosphate battery. The battery provides an output voltage which remains at an approximately constant voltage level as the battery is discharged.