General Decoupling and Sampling Technique for Reduced-Sensor Battery Management Systems in Modular Reconfigurable Batteries

The capacity and voltage rating of battery packs for electric vehicles or stationary energy storages are increasing, which challenge management monitoring. Breaking the larger pack into smaller modules using power electronics to achieve dynamic reconfiguration can be a solution. Reconfigurable batteries come with their own set problems, including many sensors complex monitoring systems, high-bandwidth communication interfaces, additional costs. Online parameter estimation methods simplify omit these problems reduce cost footprint system. However, most require only estimate subset elements in module’s equivalent circuit model (ECM). This paper proposes simple decoupling technique derive individual modules’ current profiles from output measurements without direct measurement at modules. determined high sampling rate minimum between system (BMS) With accurate profiles, an easily determine parameters Provided simulations experiments confirm this claim by estimating first-order ECM parallel capacitor. proposed reduces number 2N + 2 two pack’s terminals.