Battery equalization device

Abstract

The invention discloses a battery equalization device. The battery equalization device comprises a series battery pack, a power electronic switch array, a voltage and current sensor, an isolating type switching power supply, an external power supply switcher and an equalization controller. The equalization controller controls power electronic switches to connect batteries in the battery pack to an equalization charge circuit in turn, detects the states of the batteries and controls the isolating type switching power supply to charge the batteries with low voltage independently. The battery equalization device improves the measurement accuracy of each battery in the battery pack by adopting the bi-directional power electronic switches, constructs a low-impedance current path and reduces waste of energy resources. The battery equalization device can play a role when the battery pack is charged or discharged or left unused.

Description

technical field [0001] The invention belongs to the technical field of battery balancing, and in particular relates to a battery balancing circuit and a battery balancing method for the circuit. Background technique [0002] Conventional oil-powered vehicles such as automobiles and motorcycles will release a large amount of pollutants during use, and fuel prices are high, so electric vehicles have been used more and more, and various electric tools have also been widely used. However The management of energy storage batteries has become an important factor restricting its development. At present, mainstream electric vehicles and electric vehicle batteries are composed of a large number of low-voltage and small-capacity batteries. Each battery has different characteristics, forming a "bucket effect" during charging and discharging. Individual batteries with low capacity restrict the capacity of the overall battery pack. Play, and seriously affect the life of the battery pack...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent application (application number: 201010572115.X) discloses a battery equalization device, which uses equalization resistors to discharge batteries with high voltage, low energy utilization rate, severe heat generation, and low charging speed

[0005] Invention patent application (application number: 201110389048.2) discloses a battery power balance circuit and battery system. The scheme disclosed in this invention belongs to the active balance technology of the "Fit capacitance" method. Capacitors are used to transfer power between batteries of different voltages, and there is a balance The current is too low and the number of electronic switches requires a large number, resulting in complex circuits, high costs, and slow balancing effects, which are not suitable for high-current charging and discharging working conditions

The relay is a mechanical switch, which has the disadvantages of large volume, high cost, poor reliability, long switching time, and large closing power consumption.

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