Battery monitoring circuit, apparatus and method

摘要

Various aspects of the present disclosure are directed to monitoring battery cells. In accordance with various embodiments, a battery pack having a plurality of battery cells connected in series is monitored. Current is separately injected into individual ones of the plurality of battery cells, such as by operating a balancing circuit coupled across an individual cell, to inject current (e.g., positive or negative) into the cell. For each of the battery cells, an output is provided to indicate cell voltage of the battery cell responsive to the current injected therein. An output indicative of current through each of the battery cells is provided as well. From the respective outputs as corresponding to each individual cell, amplitude and phase characteristics of the current and voltage outputs for each of the cells are extracted to provide an indication of an impedance characteristic of the cell(s).

主权项

1. An energy storage cell apparatus, comprising:
a plurality of battery cells; a current injection circuit configured to separately inject current into individual ones of the plurality of battery cells; an impedance-detection circuit coupled to detect an impedance characteristic of the plurality of battery cells responsive to the injected current therein; a data extraction 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,separate low-frequency components of the impedance data from higher-frequency components of the impedance data, andextract impedance information for the plurality of battery cells from the high-bandwidth impedance data; and an output circuit configured to provide the low-frequency components and the extracted impedance information as an output indicative of impedance characteristics of the energy storage cell apparatus.