Battery management unit, system and method

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

Reexamination Certificate

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Reexamination Certificate

active

07400113

ABSTRACT:
A battery management unit and system for managing the state of charge of cells or batteries. Each battery management unit measures cell or battery terminal voltage and provides this information to a central controller via a communication medium. Each battery management unit monitors a plurality of batteries and can selectively charge a selected battery via a charger and switch circuit or can selectively discharge a selected battery via a load and switch circuit under the control of a controller. The controller may control charging and discharging in accordance with measurements from voltage sensors or may convey information from a voltage sensors to the central controller and receive charging and discharging commands from the central controller. Charging and discharging is controlled to maintain all batteries within a desired state of charge ranged. The central controller may selectively connect a main charger or generator to a bank of batteries associated with a battery management unit.

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“A Review of Cell Equalization Methods for Lithium Ion and Lithium Polymer Battery Systems”; Moore Et Al; SAE 2001 World Congress Mar. 5-8, 2001.

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