Battery balancing circuit and balancing method thereof and battery module activating method

• Main Authors: KUO, KUONG, HSIAO, SUNG-HSIN
• Format: Patent
• Language: Chinese; English
• Published: 16.10.2012
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

A battery balancing circuit for balancing voltages of a reference battery module and at least a detachable battery module has a load channel, a charging-discharging channel, a micro controller unit (MCU), and an electricity control circuit. The reference battery module and the detachable battery module are parallel connected. The load channel is connected to the reference battery module. The charging-discharging channel is disconnected from the reference battery module. The load and charging-discharging channels are connected to the detachable battery module respectively through a first and a second switches. When the voltage of the detachable battery module is larger or less than a threshold value, the MCU controls the first and second switches, such that the detachable battery module is connected to the electricity control circuit through the charging-discharging channel, and disconnected from the load channel. Then the MCU charges or discharges the battery module by using the electricity circuit.