Series battery equalizing equipment

Abstract

The invention relates to series battery equalizing equipment. Each battery of a plurality of batteries connected in series is connected with an equalizing module, and the equalizing module comprises a diffluence module and a flyback transformer unit. The diffluence module of the equalizing module spans two adjacent single batteries. In the diffluence module, a grid electrode of a switching tube MOSFET is connected with the anode of the first single battery; a source electrode of the switching tube MOSFET is connected with an energy storage inductor; a gate electrode is connected with a controller; the energy storage inductor is connected with the cathode of the first single battery; the cathode of a diode is connected with the source electrode of the MOSFET; and the anode of the diode is connected with the cathode of the second battery. The flyback transformer unit is characterized in that a grid electrode of the switching tube MOSFET for controlling a flyback transformer is connectedwith the anode of a third battery; the source electrode is connected with a primary side same polarity of the transformer; the gate electrode is controlled by the controller; a primary side synonyms polarity and a vice-side same polarity of the flyback transformer are both connected with the cathode of the third battery; a vice-side synonyms polarity of the flyback transformer is connected with the anode of a protection diode of the flyback transformer; and the cathode of the protection diode is connected with the anode of the first battery.

Description

technical field [0001] The invention relates to a method and device for balancing the voltage and electric quantity of each battery during charging and discharging of a series battery pack, which is suitable for lithium-ion series battery packs used in electric vehicles and other high-power series battery packs. Background technique [0002] During the use of a series battery pack, there will inevitably be energy and performance differences between the batteries. When charging, the battery with small capacity and poor performance will be overcharged, and when discharging, the battery with small capacity and poor performance will be overcharged. overdischarge phenomenon. Continuous repeated overshoot and overdischarge will make the capacity of the poor battery smaller and smaller, and the performance will be worse and worse. This vicious cycle process accelerates the damage of the poor battery. However, the available capacity of the series battery pack is determined by the c...

AI Technical Summary

Problems solved by technology

However, the equalization efficiency of this method is low, and it can only be applied to battery packs with a small number of series connections.

[0011] To sum up, in the prior art, the system is relatively complex, the cost is high, and the reliability is also greatly affected. Therefore, for high-power and large-capacity battery packs, especially for electric vehicles, the working conditions vary greatly and the reliability requirements are high. , there are great difficulties in the practical promotion of the above-mentioned equalization device

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