Battery balancing circuit and method and battery module activation method

Abstract

A battery balancing circuit is used for balancing voltages of a plurality of battery modules that are connected in parallel. The battery modules include at least one removable battery module and a reference battery module. The battery balancing circuit comprises a load channel, a charging and discharging channel, a micro control unit and an electric quantity control circuit, wherein the load channel is connected with the battery modules through a plurality of load channel switchers; the charging and discharging channel is connected to the battery modules through a plurality of charging and discharging channel switchers; when the voltage of the removable battery module is not equal to a threshold value, the micro control unit controls the plurality of load channel switchers and the plurality of charging and discharging channel switchers to allow the removable battery module to be disconnected from the load channel and the removable battery module to be connected with the electric quantity control circuit; and the micro control unit charges or discharges the removable battery module through the electric quantity control circuit. The battery balancing circuit can prevent transient heavy current of the parallel battery modules from entering electronic devices and / or the battery modules, thereby prolonging the lives of chips in the electronic devices.

Description

Technical field [0001] The invention relates to a battery balance circuit, a balance method thereof and a battery module activation method. Background technique [0002] For energy storage equipment (such as the uninterruptible power system of a server), there are usually multiple battery modules connected in parallel to provide power to the electronic device. [0003] However, when a new battery module and an old battery module are connected in parallel, the voltages of the new battery module and the old battery module may be different from each other, which may cause an instantaneous large current to flow into the electronic device and / or the battery module itself. The large current flowing into the electronic device at this moment may damage the electronic device and / or the battery pack itself, resulting in shortened life of the electronic device and / or damage to the battery pack. [0004] In addition, when the battery module remains saturated or unused for a long time, the batte...

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Problems solved by technology

[0003] However, when a new battery module is connected in parallel with an old battery module, a momentary large current may flow into the electronic device and / or the battery module itself because the voltages of the new and old battery modules are different from each other.

This instantaneous high current rushing into the electronic device may damage the electronic device and / or the battery pack itself, resulting in shortened life of the electronic device and / or damage to the battery pack

[0004] In addition, when the battery module remains saturated or not in use for a long time, the battery module may be susceptible to factors such as material salinization, plate corrosion, and thermal runaway, which will lead to aging and failure of the battery module

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