Patent ID: 9214681
Filing Date: 2015-12-15
Classification: H01M

Abstract:
1. A power supply comprising a primary cell adapted to provide a primary cell current, the primary cell comprising: an active metal anode; a cathode current collector; an electrolyte in contact with the active metal anode and the cathode current collector; a passivation layer formed on a surface of the active metal anode by means of a chemical reaction between the active metal anode and the electrolyte; a resistor having a resistance from about 50 kiloohms to about 120 kiloohms, wherein the resistor is configured to limit the magnitude of the primary cell current, for the lifetime of the primary cell, to a maximum of a corresponding primary current density at which the passivation layer remains essentially unaffected, wherein the primary current density is 10 μA/cm an energy storage device that is configured to be charged using the primary cell current and to periodically provide a load current at a magnitude greater than the primary cell current, wherein an output of the resistor is coupled to a first side of the energy storage device, and the active metal anode is coupled to a second side of the energy storage device.