Active equalizing charging method and device for LiFePO4 power battery packs

The invention provides an active equalizing charging method for LiFePO4 power battery packs. The method comprises the following steps: detecting the parameters of single batteries in real time, calculating the charge states of the single batteries according to the detected parameters, and calculating and updating the average charge state of a battery pack in real time according to the obtained charge states of the single batteries; comparing the charge state of each single battery with the average charge state of the battery pack; when the charge state of a single battery is less than the average charge state of the battery pack, carrying out equalizing charging on the single battery; when the charge state of a single battery is close to a threshold of the average charge state of the battery pack, ending the equalizing charging of the single battery; when the charging of all the single batteries subjected to equalizing charging is completed, determining that the equalizing charging of the whole battery pack is completed, at this moment, the charge states of all the batteries are basically consistent; repeating the steps so as to carry out a new cycle; and when the charge states of all the single batteries in the battery pack are all close to the average charge state of the battery pack, stopping equalizing charging.