An automatic equalization control method without battery cell voltage sensor

A single voltage, automatic equalization technology, applied in charge equalization circuit, battery circuit device, arrangement of multiple synchronous batteries, etc., can solve the problems of long control cycle, reduced equalization efficiency, multi-resources, etc., to reduce energy waste , The effect of saving control time and reducing system volume

CN104578309BActive Publication Date: 2016-08-31SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-31

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Abstract

The invention discloses an automatic equalization control method without a battery monomer voltage sensor. According to the method, the voltage of battery monomers is compared with the average voltage of a battery pack, so that the energy flow direction is determined, a current monomer qualified flag bit is reset, and according to the magnitude of the voltage of the monomers and the average monomer voltage of the battery pack, the output voltage and the working mode of a Buck-Boost conversion module are determined; comparison is achieved through a voltage comparator each time, the battery monomer voltage sensor is not needed, and system erection cost is saved; the allowable voltage difference range between the monomer voltage and the average voltage is set, when the monomer voltage is within the range, the battery monomers are not equalized, a next battery monomer is directly jumped to, system control time and equalization time are greatly shortened, the equalization frequency is reduced, the equalization efficiency is effectively improved, and excessive equalization is avoided.
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Description

technical field

[0001] The invention relates to an automatic equalization control method for a battery-free single voltage sensor. Background technique

[0002] The world is facing an unprecedented energy and environmental crisis, and the worldwide energy shortage and environmental deterioration have attracted the attention of all countries. Electric vehicles have the characteristics of energy saving and environmental protection, which is the key way to solve this major crisis, and has become an inevitable trend in the future development of the automobile industry. As an important part of the world's energy technology revolution and the national new energy strategy, electric vehicles are one of the country's seven strategic emerging industries. Lithium-ion batteries have the advantages of small size, light weight, fast charging speed, and good anti-memory effect compared with nickel-hydrogen and lead-acid batteries. They are widely used as power sources in electric vehicles...

Examples

Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] Such as figure 1 As shown, an equalization circuit based on Buck-Boost conversion and bidirectional LC resonant conversion, including microcontroller, balanced bus, Buck-Boost conversion circuit, bidirectional LC resonant conversion circuit, selection switch module, power battery pack and filter capacitor. The circuit realizes the soft switch equalization of battery pack to battery cell (Pack to Cell) or battery cell to battery pack (Cell to Pack) through Buck-Boost transformation and bidirectional LC resonance transformation. The working principle of this circuit is: the microcontroller obtains the average voltage of the cells according to the collected voltage of the battery pack, determines the balanced working mode by comparing the average voltage of the cells with the current balanced cell voltage, and controls the Buck-Boost conversion and ...