| abstract |
A battery monitoring device includes a first coil positioned within a cell of a battery, a second coil positioned to be magnetically coupled to the first coil through active material that is contained within the cell, and a controller that is configured to apply an electrical current to one of the first and second coils, detect induced electrical current in the other of the first and second coils, and determine a state-of-charge (SOC) of the battery based on the induced electrical current. |