Balanced charging device and balanced charging method

Abstract

The invention provides a balanced charging device, which comprises a controller, a plurality of charge-discharge subcircuits and a voltage converting device, wherein the controller is used for acquiring an actual voltage value of each single battery in a battery pack, comparing the actual voltage value with a given voltage range to determine an unbalanced single battery, sequentially controlling the switching on and off of each charge-discharge subcircuit connected with the unbalanced single battery and controlling the voltage converting device to charge or discharge the unbalanced single battery to balance the unbalanced single battery. A balanced charging method comprises the following steps: performing voltage sampling on each single battery in a series battery pack to obtain the actual voltage value of each single battery; comparing the actual voltage value with the given voltage range to determine the unbalanced single battery; and sequentially charging or discharging the unbalanced single battery to balance the unbalanced single battery. The balanced charging device and the balanced charging method provided by the invention solve the problem of unbalanced charging of the series battery pack and effectively improve the service performance of the battery pack.

Description

technical field [0001] The invention relates to a charging device, in particular to an equalizing charging device and an equalizing charging method for series battery packs. Background technique [0002] Rechargeable power batteries are widely used in various electronic products, especially electric vehicles, because of their better utilization. An electric vehicle has a battery pack as a power supply device in which a plurality of single cells are connected in series. Due to the limitations of the process conditions of the rechargeable power battery itself, there is a voltage difference between each single battery. After multiple charge and discharge cycles, the voltage difference between the single cells will become larger and larger, which will easily lead to unbalanced charging of the battery pack in series during the charging process, which will reduce the effective capacity of the battery pack in series and affect the battery pack. The use performance of electric veh...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of small effective capacity and poor performance of battery packs caused by unbalanced charging of series-connected battery packs, and to provide a new, simple and effective equalization charging device for series-connected battery packs

[0004] Another object of the present invention is to provide an unbalanced single battery that does not reach the minimum value of a given voltage range in the battery pack in order to solve the problems of small effective capacity and poor performance of the battery pack caused by unbalanced battery voltage. way to balance

[0005] Another object of the present invention is to solve the problem of small effective capacity and poor service performance of the battery pack caused by unbalanced voltage of the battery pack, and to provide a battery pack that exceeds the maximum value of the given voltage range. balanced approach

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