Battery pack active equalization circuit and method

• Main Authors: ZHANG YUPING, SONG HUAWEI, WANG YUANYANG, LUO FAN, YANG JIE, BIE CHUANYU
• Format: Patent
• Language: Chinese; English
• Published: 23.05.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides an active equalization circuit and method for a battery pack, and the method comprises the steps: determining a single battery which needs to be actively equalized in the battery pack, and enabling the single battery which needs to be actively equalized in the battery pack to be connected to a capacitive voltage-dividing equalization circuit and a voltage detection circuit; when the single battery is detected by the voltage detection circuit and the difference between the highest voltage and the lowest voltage of the single battery is greater than a first threshold value, the switch control circuit controls the active equalization circuit to start an equalization mode, and when the single battery is detected by the voltage detection circuit and the difference between the highest voltage and the lowest voltage of the single battery is less than a second threshold value, the active equalization circuit starts an equalization mode. And when the voltage difference between the single battery