Clock test-and-control type balanced charging method for lithium battery pack

Abstract

The invention discloses a clock test-and-control type balanced charging method of a lithium battery pack, wherein, a balanced charging circuit comprises the lithium battery pack, a plurality of module power supplies and a clock pulse generator, wherein, the lithium battery pack is composed of a plurality of single lithium batteries which are connected in series, an output end of each module power supply is correspondingly connected with the single lithium battery, and each module power supply is respectively equipped with an independent control switch; a pulse signal generated by the clock pulse generator controls connection and disconnection of the control switches of the plurality of the module power supplies; and each single lithium battery independently charges under control, and at the moment when the control switches of the module power supplies are disconnected and charging current is zero, the testing and controlling voltage of the corresponding single battery is sampled. The balanced charging method of the invention can eliminate influence of the charging loop resistance and the internal resistance of the battery, ensure voltage balance for each lithium battery during the charging process of the lithium battery pack and guarantee safety control against overcharge of each lithium battery pack.

Description

technical field [0001] The invention relates to a balanced protection charging technology for a lithium battery pack, in particular to a beat measurement and control type balanced charging method for a lithium battery pack. Background technique [0002] As the awareness of environmental protection is deeply rooted in the hearts of the people, new energy has been paid more and more attention by countries all over the world. Large-capacity lithium batteries have high single voltage, small size, and high energy, which will be the main body of new energy battery applications in the future. However, the problem of safe charging has always been a difficult problem for lithium battery applications. Several single lithium batteries are connected in series to form a battery pack. Charging will cause the voltage of each single lithium battery to be inconsistent. Once the voltage of a certain battery exceeds 4.20V, there will be a danger of explosion. How to control it is the problem w...

AI Technical Summary

Problems solved by technology

Large-capacity lithium batteries have high single voltage, small size, and high energy, which will be the main body of new energy battery applications in the future. However, the problem of safe charging has always been a difficult problem for lithium battery applications. Several single lithium batteries are connected in series to form a battery pack. Charging will cause the voltage of each single lithium battery to be inconsistent. Once the voltage of a certain battery exceeds 4.20V, there will be a danger of explosion. How to control it is the problem we are currently facing

That is to say, it consumes too much energy and cannot complete the high-current equalization capability of the power lithium battery. There is no reliable equalization technical guarantee for large-capacity lithium batteries.

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