A series battery equalization circuit

Abstract

The invention provides a series battery equalization circuit belonging to the field of electric power and electronic techniques. The circuit comprises a voltage sampling module, a controller, a disconnecting switch module and an energy storage module. A voltage acquisition input terminal of the voltage sampling module is connected to a series battery. A voltage acquisition output terminal of the voltage sampling module is connected to a voltage input terminal of a controller. A control signal output terminal of the controller is connected to a control terminal of the disconnecting switch module. A voltage input terminal of the disconnecting switch module is connected to the series battery. A first voltage output terminal and a second voltage output terminal of the disconnecting switch module are respectively connected to the two terminals of the energy storage module. According to the invention, high-precision balancing between voltages of batteries in the series battery can be realized to enable normal fully-charging and fully-discharging of the whole series battery. Transferring efficiency and equalization efficiency of electric quantities between the batteries can be raised. In addition, equalization can be realized in charging, discharging and static states by the series battery equalization circuit of the invention. The equalization of the batteries can be realized just by a capacitor. The cost for the equalization circuit is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an equalizing circuit of series battery packs. Background technique [0002] In the battery application system, in order to provide sufficient voltage for the device, the battery pack is usually composed of multiple cells in series, but if the capacity of the batteries does not match, it will affect the capacity of the entire battery pack. After working for a certain period of time, the battery packs formed in series will show great differences due to the inconsistency of the cells themselves, the inconsistency of the working temperature and other factors, which will seriously affect the life of the battery pack and the use of the system. , eventually affecting the normal use of electronic equipment. [0003] Overcharging and overdischarging the battery makes the battery vulnerable to damage, such as reduced battery capacity and reduced lifespan. Excessive...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a balance circuit for battery packs in series, which aims to solve the problems of large heat generation and high requirements for chargers in the battery balance circuit in the prior art

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