Patent ID: 8626369

Claim:
An electric vehicle battery charging system, comprising: a battery pack, wherein said battery pack is configured for use within an electric vehicle and to provide power to said electric vehicle, and wherein said battery pack is comprised of at least one metal-air cell; at least one oxygen concentration sensor; a charging system controller coupled to said at least one oxygen concentration sensor and receiving an output data signal from said at least one oxygen concentration sensor, said charging system controller configured to determine an oxygen concentration level based on said output data signal from said at least one oxygen concentration sensor, wherein said charging system controller is configured to set battery pack charging conditions based on said oxygen concentration level, wherein said battery pack charging conditions include suspension of charging system operation when said oxygen concentration level exceeds a first preset oxygen concentration level and resumption of charging system operation when said oxygen concentration level falls below a second preset oxygen concentration level; and a battery pack charging system coupleable to said battery pack and to an external power source, wherein said battery pack charging system charges said battery pack in accordance with said battery pack charging conditions set by said charging system controller.