Battery pack balancing device based on utilization of battery pack capacity and control method thereof

Abstract

The invention relates to the field of battery pack balancing control, in particular to a battery pack balancing control device and a balancing control method thereof. The device is used for controlling balance of a battery pack with serial connection of more than one battery and comprises a judging module which is used for judging whether a battery pack is to be balanced and a balancing module which is used for balancing the battery pack. The battery pack and the judging module are respectively connected with the balancing module; the judging module is connected with the balancing module so as to control the balancing module to balance the battery, and the judging module controls the balancing module to balance the battery according to the monitored utilization rate of the battery pack capacity. The invention adopts the utilization rate of the battery pack capacity as a quantitative evaluation standard for judging the consistency of the battery pack, and realizes the real-time monitoring of the consistency of the battery pack through monitoring the utilization rate of the battery pack capacity. Therefore, the invention can accurately balance the batteries in the battery pack, improve the utilization rate of the battery pack capacity, and prolong the service life of the batteries.

Description

technical field The invention relates to the field of battery pack balance control, in particular to a battery pack balance control device and a balance control method. Background technique In order to achieve a certain voltage, power and energy level, batteries need to be used in series in groups, such as electric vehicles, energy storage systems, DC systems, etc. However, since it is impossible to achieve complete consistency during production and use, the consistency between batteries is relative, and the inconsistency is absolute. Batteries with small capacity, large internal resistance, and high self-discharge rate are more likely to be overcharged, overdischarged, and overheated during charging and discharging, resulting in faster battery performance degradation and a "positive feedback", which leads to battery consistency problems is accelerated and magnified. Since the application technology of the battery involves the knowledge of electrochemistry, electricity and...

AI Technical Summary

Problems solved by technology

The invention provides a battery pack balance control device to solve the technical problem of inaccurate battery balance in the prior art

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