Nickel-metal hydride battery large current equalization method based on single-chip microcomputer control

Abstract

The invention discloses a nickel-metal hydride battery large current equalization method based on single-chip microcomputer control. Provided is a nickel-metal hydride battery system, which comprises at least two nickel-metal hydride batteries in series connection, a first contactor and a second contactor, the number of which is same with that of the nickel-metal hydride batteries, a large current discharge resistor, a nickel-metal hydride battery voltage detection module, a single-chip microcomputer controller and a protection device. The single-chip microcomputer controller obtains voltage of each nickel-metal hydride battery through the nickel-metal hydride battery voltage detection module; and when the balance degree between the nickel-metal hydride batteries is larger than a set threshold value, the nickel-metal hydride battery, of which the voltage is the largest, is discharged through the large current discharge resistor according to the set time. The method adopts a single-chip microcomputer to serve as a main equalization controller, thereby reducing cost of the system; through a contactor matrix manner, large current discharge of the nickel-metal hydride battery is realized, thereby improving equalization reliability and realizing large current discharge; and 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 battery packs, in particular to a large-current equalization method for nickel-metal hydride batteries based on single-chip microcomputer 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 a...

AI Technical Summary

Problems solved by technology

When the capacity of the Ni-MH 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 Ni-MH 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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