Energy balance control device and energy balance control method of battery pack

Abstract

The invention relates to the field of the balance control of battery packs, in particular to a balance control device and a balance control method of a battery pack. The device is used for controlling the balance of a battery pack formed by connecting more than one battery in series. The device comprises a judgment module and a balance module, wherein the judgment module is used for judging whether the battery pack needs to be balanced or not; the balance module is used for balancing the battery pack; the battery pack and the judgment module are respectively connected with the balance module; and the judgment module is connected with the balance module, is used for controlling whether the balance module carries out battery balance or not and controls whether the balance module balances the battery or not according to the monitoring of the utilization rate of the energy of the battery pack. The invention adopts the utilization rate of the energy of the battery pack as a quantitative evaluation standard for judging the uniformity of the battery pack, monitors the uniformity of the battery pack at real time by monitoring the utilization rate of the energy of the battery pack and can accurately carry out the battery balance on the battery pack, thereby enhancing the utilization rate of the energy and prolonging 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. technical background 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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