Method and device for controlling battery charging and discharging current

Abstract

The invention discloses a method and a device for controlling battery charging and discharging current. The method and the device are used for solving the problem that the charging and discharging current of a battery cannot be effectively controlled in the prior art. The method comprises the following steps that after a mixed energy storage system is electrified, the charge state, the health state and the open circuit voltage of a battery in the mixed energy storage system and the work current of the mixed energy storage system are determined; the internal resistance of the battery is determined according to the charge state and the health state of the battery and the work current of the mixed energy storage system; according to the determined open circuit voltage and the internal resistance of the battery as well as the preset expected battery charging current and the expected battery discharging current, the voltage upper limit value and the voltage lower limit value of the battery are determined; a two-way DC-DC (direct current to direct current) converter is used for controlling the charging and discharging current of the battery according to the voltage upper limit value and the voltage lower limit value, so that the charging current of the battery is not higher than the expected battery charging current, and in addition, the discharging current is not higher than the expected battery discharging current.

Description

technical field [0001] The invention relates to the technical field of battery charge and discharge control, in particular to a method and device for controlling battery charge and discharge current. Background technique [0002] At present, bidirectional DC-DC converters are usually used in large-capacity energy storage systems, especially in hybrid energy storage systems including supercapacitors and batteries, which can improve the capacity utilization of hybrid energy storage systems and benefit the utilization of batteries and supercapacitors. Modular use meets the reliability and safety of the operation of the hybrid energy storage system under various complex working conditions. [0003] The bidirectional DC-DC converter has energy bidirectional flow control characteristics such as constant voltage, constant power, and constant current. When multiple bidirectional DC-DC converters operate in coordination, the power distribution ratio can be determined by power sharin...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a method and device for controlling the charging and discharging current of the battery to solve the problem in the prior art that the charging and discharging current of the battery cannot be effectively controlled

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