Patent ID: 8648602

Claim:
An energy storage cell apparatus, comprising: a current injection circuit configured to separately inject current into individual ones of a plurality of battery cells configured to store energy; an impedance-detection circuit coupled to detect an impedance characteristic of each of the plurality of battery cells responsive to the injected current therein; a filter circuit coupled to the impedance-detection circuit and configured to receive high-bandwidth impedance data regarding the detected impedance characteristic from the impedance-detection circuit, and separate low-frequency components of the impedance data from higher-frequency components of the impedance data; a memory circuit configured to store data corresponding to the high-bandwidth components; and an access circuit configured to provide the low-frequency components for the plurality of battery cells to a battery pack controller, and to access and provide the stored high-bandwidth components for a subset of the individual battery cells to the battery pack controller based upon available bandwidth for communicating the high-bandwidth components.