Lithium-iron battery large-current equalization method based on FPGA control

Abstract

The invention discloses a lithium-iron battery large-current equalization method based on FPGA control. The method is characterized in that a lithium-iron battery control system is set, the lithium-iron battery control system comprises at least two serially-connected lithium-iron batteries, first contactors, second contactors, a large-current discharge resistor, a lithium-iron battery voltage detecting module, a FPGA controller and a protecting device, and each lithium-iron battery corresponds to one first contactor and one second contactor; the FPGA controller acquires the voltage of each lithium-iron battery through the lithium-iron battery detecting module, and the lithium-iron battery with the largest voltage is discharged through the large-current discharge resistor according to set time when the equalization degree among the lithium-iron batteries is larger than a set threshold. The lithium-iron battery large-current equalization method has the advantages that the FPGA controller is used as the main equalization controller, and control stability and quickness are increased; large-current discharge of the lithium-iron batteries is achieved by a contactor matrix manner so as to increase equalization reliability; the method is simple to operate, safe and reliable, and good in equalization effect.

Description

technical field [0001] The invention belongs to the technical field of equalization of lithium battery packs, and in particular relates to a large current equalization method for iron-lithium batteries based on FPGA control. Background technique [0002] The development of fuel vehicles has caused a huge consumption of oil resources, the deepening of the global energy crisis, and at the same time aggravated the harm of the greenhouse effect and air pollution. Most countries, governments and automobile companies in the world generally recognize that energy saving and emission reduction is the future development direction of the automobile industry, and the development of electric vehicles will be the best way to solve this difficulty. Electric vehicles have the advantages of low noise, no exhaust emissions, environmental friendliness, high thermal efficiency, low emissions, recyclable utilization, and improved energy structure. Various automobile manufacturers are actively d...

AI Technical Summary

Problems solved by technology

When the capacity of the iron-lithium battery is relatively large, the discharge current of the discharge resistor will hardly meet the requirements of fast equalization

If the power of the discharge resistor corresponding to each iron-lithium battery is increased, its volume and heat dissipation will face new challenges. Existing methods for balancing resistance have few methods for balancing large currents

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