Apparatus and method for electric voltage equalization of accumulator units connected in series

Abstract

Provided is an apparatus and method for equalizing voltage of accumulator units connected in series. The voltage equalizing apparatus includes a DC / AC converter (31), a current-limiting inductance (33); and N voltage-equalizing branch paths (32), wherein N is natural number. The current-limiting inductance of the equalizing apparatus can be distributed into each voltage equalizing branch path and be replaced by an equivalent leakage inductance, or by means of connecting a separate inductance on the prime side of the transformer. The voltage equalizing apparatus absorbs energy from the accumulator and transfers to the accumulator unit with lower voltage in the accumulator, thus the balance of the voltage of each accumulator unit. The invention is characterized in that the circuit structure and the control method is simple, the switch tube may realize soft switching, the converter volume is small, and autonomous democratic voltage equalizing of the accumulator is implemented.

Description

technical field [0001] The present invention proposes a device and method for voltage balancing of energy storage units connected in series, which belongs to a device and method for voltage balancing of energy storage devices, especially a device and method for voltage balancing of supercapacitors and storage batteries connected in series . Background technique [0002] Supercapacitors are also called electric double-layer capacitors or electrochemical capacitors, which have excellent pulse charge and discharge performance and large-capacity energy storage performance. Systems, electric locomotive regenerative braking systems and other applications have received extensive attention from scientific researchers. The voltage of a single supercapacitor is low, and multiple supercapacitors need to be combined in series in practical applications. Due to the limitation of materials and manufacturing level, the parameters of supercapacitors have certain dispersion, which leads to ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the above-mentioned voltage equalization device is that the device must monitor the voltage of each monomer in real time when it is working, and control the switching network to switch the balanced power supply to the corresponding monomer.

When the number of energy storage units increases, the scale of the monitoring circuit and switching network also increases, resulting in an increase in the size of the entire device, an increase in cost, and a decrease in reliability

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