Charging circuit for equalizing activation of multi-section series lithium ion battery pack and battery pack

Abstract

The invention discloses a charging circuit for equalizing activation of a multi-section series lithium ion battery pack and a battery pack. The charging circuit is used for charging the battery pack formed by arranging m lithium ion batteries in series and comprises a power frequency transformer, m rectifier bridges, m voltage-measuring control circuits and (m+1) guide lines, wherein the power frequency transformer is used for transforming mains supply to output voltage of m secondary windings corresponding to charging batteries; the m rectifier bridges are used for performing full-wave rectification on alternating current to form a sine wave direct current; the m voltage-measuring control circuits are used for detecting the voltage of each section battery and turning off the charging circuit; and the (m+1) guide lines are used for connecting the voltage-measuring control circuits and the batteries to form a charging loop. By the charging circuit, equalizing charge of all batteries isrealized, the battery pack is maintained and preserved, uncharged application capacity of the battery pack is ensured, the service life of the battery pack is prolonged, and most of over-discharged batteries can be continuously available after being activated and charged. Moreover, the circuit is simple and reliable, low in cost, convenient to maintain, and easy for industrialized production.

Description

technical field [0001] The invention relates to a charging circuit for a multi-section series lithium-ion battery pack, in particular to a multi-section series-connected lithium-ion battery pack balancing activation charging circuit and a battery pack. Background technique [0002] In recent years, the application of electric bicycles and electric vehicles has become more and more extensive. The energy provided by them is provided by multi-section series such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, lithium iron phosphate, titanate A battery pack composed of lithium-ion batteries such as lithium. At the same time, the application of various energy storage batteries is becoming more and more extensive. This creates the problem of charging these multi-cell Li-ion battery packs in series. Currently, most lithium-ion battery packs use a series charging circuit. Such as figure 1 As shown, a power module 01 charges a battery pa...

AI Technical Summary

Problems solved by technology

The main problems are as follows: 1) Too many power modules are used, resulting in high cost; 2) Too many wires and complex circuits lead to a decrease in reliability; 3) The voltage drop of the charging cable affects the pressure measurement accuracy, 4) The distance between the power modules The consistency is poor, making the charging of each battery unbalanced

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