Charging/discharging active equalization circuit for lithium ion power battery pack

Abstract

The invention provides a charging / discharging active equalization circuit for a lithium ion power battery pack, comprising a voltage acquisition module, a single battery selection circuit, a voltage equalization circuit, a storage battery and a power battery pack. The charging / discharging active equalization circuit for the lithium ion power battery pack serves as a part of a battery management system of on-board power battery pack and is developed based on the improvement of the traditional charging / discharging equalization method; the equalization circuit is simple, reliable and easy to control; when the power battery pack is equalized, no electric energy of the power battery pack is consumed basically; and the active equalization course is rapid and high-efficient and the charging / discharging state of battery can be managed effectively, so that the service life of battery can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of battery charge and discharge, and in particular relates to an active equalization circuit for charge and discharge of a lithium-ion power battery pack. Background technique [0002] Modern electric vehicles mostly use series power battery packs, and lithium-ion power batteries will be used in large quantities in the future. The safe and efficient use of power batteries is of great significance to the normal operation of electric vehicles. [0003] During the use of the battery pack, due to the inconsistency between the individual batteries, the difference caused by continuous charge and discharge cycles will accelerate the capacity decay of some individual batteries. Due to the craftsmanship and other reasons in the production process, even batteries of the same batch and type have differences in capacity, internal resistance, etc., and in the long-term use process, this difference will become larger and...

AI Technical Summary

Problems solved by technology

[0003] During the use of the battery pack, due to the inconsistency between the individual batteries, the difference caused by continuous charge and discharge cycles will accelerate the capacity decay of some individual batteries.

Due to the craftsmanship and other reasons in the production process, even batteries of the same batch and type have differences in capacity, internal resistance, etc., and in the long-term use process, this difference will become larger and larger, and then Unbalanced charging and discharging of the power battery pack

Imbalance has a great impact on the performance of the battery pack in series, which will reduce the overall capacity of the battery pack and shorten the service life

Images