Abstract:
디젤발전하이브리드에너지저장장치는디젤발전기를지능형충전장치를통해배터리의 DC 입력단에연결하고, 동시에부하에전력을공급하는 AC 출력단에연결되며, 평상시에배터리를운전하여특정서비스에부하전력을공급하며, 다중서비스를동시에제공하는경우디젤발전기를운용하여상기배터리의운전시간을연장하도록제어하는지능형전력관리시스템을포함하는것을특징으로한다.
Abstract:
A method for balancing cells of a battery module is provided to balance voltages of at least two battery cells included in a battery module by a battery management system (BMS). The method for balancing cells of a battery module includes the steps of: (a) measuring, by a measuring unit included in a BMS, an open circuit voltage (OCV) which is a charge voltage of each of battery cells; (b) setting, by a control unit of the BMS, a voltage included among the measured OCVs as a balancing voltage; (c) controlling, by the control unit of BMS, the respective battery cells having the measured OCVs which are higher than the balancing voltage to be balanced to have the balancing voltage by discharging currents to resistance based on the set balancing voltage by controlling a switch circuit which is included in a cell balancing unit of the BMS and is electrically connected to the resistance; and (d) controlling, by the control unit of the BMS, the respective battery cells having the measured OCVs which are lower than the balancing voltage to be balanced to have the balancing voltage by injecting currents of a current source into the respective battery cells having the measured OCVs which are lower than the balancing voltage by controlling the switch circuit which is included in the cell balancing unit and is electrically connected to the current source.
Abstract:
A method of estimating a state of charge of a battery relates to a method of estimating the state of charge (SOC) of a battery module having at least one battery cell through a battery management system (BMS) which includes (a) a step where a measuring unit included in the battery management system measures the off potential, which is the open circuit voltage of the battery cell; and (b) a step where a control unit of the battery management system estimates the state of charge corresponding with the off potential measured in step (a) based on a lookup table. The lookup table includes battery cell temperature, charging and discharging numbers and state of charge (SOC) corresponding with the off potential according to the discharge current amount.