A balance control circuit

Abstract

The embodiments of the invention disclose an equalization control circuit. Multiple equalization control chips are arranged, each equalization control detects the battery state signals of adjacent two monomer batteries and performs equalization control on the two adjacent monomer batteries according to the battery state signals. Particularly, when the charged amounts of the two adjacent monomer batteries are different, the charged amount difference between the two monomer batteries is eliminated through charge transfer, and when the charged amounts of the any two adjacent monomer batteries are the same, the charge and discharge process of each monomer battery in a whole battery pack can be consistent, such that the performance differences between the monomer batteries are reduced and even eliminated, the service life of the battery pack is prolonged, and the problems in the prior art are solved.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to an equalization control circuit. Background technique [0002] As resource and environmental problems become increasingly prominent, electric vehicles powered by vehicle-mounted power supplies are being used more and more widely. Lithium batteries have the advantages of high energy density and volume density, high working voltage, no memory effect, low self-discharge and no environmental pollution problems, and are ideal power sources for electric vehicles. However, the voltage of a single lithium battery is too low. In order to obtain a higher working voltage, it is generally necessary to connect lithium batteries in series to form a battery pack. [0003] During the manufacturing process of the single battery, the performance of the single battery is dispersed, and the internal environment of the battery pack is also non-uniform during the use process. Ther...

AI Technical Summary

Problems solved by technology

However, the voltage of a single lithium battery is too small. In order to obtain a higher working voltage, it is generally necessary to connect lithium batteries in series to form a battery pack.

[0003] During the manufacturing process of the single battery, the performance of the single battery is dispersed, and the internal environment of the battery pack is also non-uniform during use. Therefore, as the use time increases, the performance difference between the single batteries will gradually widen. However, if no corresponding measures are taken to reduce this difference, it will cause overcharge of some single cells, over discharge of some single cells, overcharge and over discharge, which will not only affect the service life of the battery, but also damage the battery. , but also may generate a large amount of heat causing the battery to burn or explode

[0004] In the prior art, when the batteries of electric vehicles are used in series, due to the battery quality, batch and other reasons as well as the damage of individual single cells during use, after long-term use of the battery pack, the gap between the single cells The difference in performance will gradually widen, and this difference will become larger and larger with time, causing the single battery with small capacity to always be overcharged when charging multiple batteries in the battery pack at the same time. The discharge state accelerates the attenuation of its life, which eventually leads to the decline of the overall life of the battery pack.

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