Equalizing charge method and equalizing charge device for battery

Abstract

The invention relates to the technical field of charge, and discloses an equalizing charge method and an equalizing charge device for a battery. The device comprises a control module; the control module monitors the voltage signal of each single battery; and when the voltage signal of the monitored single battery exceeds a comparison voltage value, a shunt unit connected in parallel with the single battery is controlled to shunt so as to reduce the charge current of the single battery. Because the adopted shunt unit can automatically realize voltage balance between the single batteries, the equalizing charge method and the equalizing charge device for the battery can gradually reduce the inconsistency of a battery pack, ensure that all the single batteries in the battery pack reach consistency after several times of charge cycle, and effectively ensure the safety of each single lithium battery in use and prolong the service life; and the device has the advantages of simple control, low cost, higher efficiency and low heat consumption, can replace an expensive special equalizing chip, and can be widely applied in civilian industry products supplied with power by the lithium battery.

Description

technical field [0001] The invention relates to the technical field of charging, in particular to a battery equalization charging method and device. Background technique [0002] In engineering applications, lithium-ion battery cells or battery modules composed of single cells in parallel must be connected in series to form a battery pack, so the imbalance of each battery cell or battery module must be considered during the charging process. [0003] Due to the inconsistency of the performance parameters of lithium batteries, the difference in performance parameters will be enlarged during use, and the charging method of lithium ion battery packs in the prior art cannot solve the electrochemical characteristic deviation phenomenon in the long-term charging process of lithium ion batteries, so that lithium ion batteries The unbalanced charging of the battery cells in the battery pack cannot make the lithium battery pack reach the best charging and use state. And over time, t...

AI Technical Summary

Problems solved by technology

[0003] Due to the inconsistency of the performance parameters of the lithium battery will lead to the expansion of the performance parameter difference in the use process, and the charging method of the lithium ion battery pack in the prior art cannot solve the electrochemical characteristic deviation phenomenon in the long-term charging process of the lithium ion battery, so that the lithium ion The unbalanced charging of the battery cells in the battery pack cannot make the lithium battery pack reach the best charging and use state

And over time, this imbalance can worsen, seriously affecting battery life and reliability

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