Guasi-static equalizing charge system and method for serially connected lithium battery pack

Abstract

The invention discloses a guasi-static equalizing charge system for a serially connected lithium battery pack. The system comprises a single-chip machine, an A / D converter circuit, a voltage reference circuit, a decoder circuit I, a decoder circuit II and a charging circuit, wherein the I / O port of the single-chip machine is connected with the input end of the decoder circuit I; the charging circuit comprises a decoder circuit II, a relay charging control module and a charging control module; the input end of the decoder circuit II is connected with the I / O port of the single-chip machine; and the control input end of the charging control module is connected with the control output end of the single-chip machine. In the invention, voltage quick measurement and equalizing charge of a single lithium battery are tightly combined and the single-chip machine determines the battery which has the lowest voltage through a voltage detection loop and sends a control signal to make a charging loop work, so that the problem that the overall performance of the whole serially connected battery pack is influenced due to the difference of performance of each single battery when a plurality of lithium batteries are connected in series and charged is solved. In addition, the invention also discloses a guasi-static equalizing charge system for the serially connected lithium battery pack.

Description

technical field [0001] The invention relates to the field of rechargeable batteries, in particular to a quasi-static balanced charging system and method for series lithium battery packs. Background technique [0002] With the development of battery technology, many devices such as automobiles, electric vehicles, and electric tools in the prior art use series-connected battery packs to store electric energy. Due to the differences in capacity and self-discharge among the individual cells, after a period of use, the performance of the battery pack is greatly reduced, which affects the promotion and application of battery technology. [0003] Therefore, in the process of using multiple lithium batteries in series, it has become an urgent technical problem to use balanced charging on the single batteries to minimize the difference between them. In the known technology, the balanced charging technology is mostly solved by self-discharging the overvoltage single battery, but the ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, one of the purposes of the present invention is to provide a quasi-static equalization charging system for lithium battery packs in series, to solve the problem of the difference in performance of each single battery when multiple lithium batteries are charged in series. Issues that affect the overall performance of the entire battery pack in series

Images