Battery management system with active equalization system

Abstract

The invention discloses a battery management system with an active equalization system. The battery management system comprises a single chip microcomputer control circuit, the active equalization system and a data acquisition system, wherein the active equalization system and the data acquisition system are respectively connected with the single chip microcomputer control circuit; the active equalization system comprises a relay gating switch, an additional charge unit, an additional discharge unit and a digital analog switch; the data acquisition system comprises a battery cell voltage acquisition unit; the battery cell voltage acquisition unit comprises an integrated operational amplifier unit and a digital analog switch. According to the battery management system disclosed by the invention, the equalization system is provided with the additional charge unit and the additional discharge unit, and therefore equalization management can be performed on the voltage of each battery cell in a battery pack, and the phenomenon that the battery cells in the battery pack are overcharged or over-discharged can be further avoided; the battery management system disclosed by the invention can be widely applied in the aspects of communication, electric power, traffic and new energy, and has important significance in maintaining the normal operation of the battery pack.

Description

technical field [0001] The invention relates to a battery management system, in particular to a battery management system with an active balancing system. Background technique [0002] The battery as an important energy storage tool, because the voltage of a single battery is very low, it usually needs to be connected in series to form a battery pack to meet the voltage requirements. The most feared thing in the use of the battery pack is the overcharge and overdischarge of the single battery. Once this happens, the battery will be damaged, the capacity will be reduced, the lifespan will be shortened, and in severe cases, it will burst and catch fire. [0003] Therefore, when the battery is in use, even if it is a single battery, battery management must be performed, and a battery management system must be configured. This is an essential measure to ensure battery safety, performance and service life. When the batteries are used in series to form a battery pack, it is more...

AI Technical Summary

Problems solved by technology

The single battery in the battery pack has different usage characteristics due to the different manufacturing and use conditions of the battery. , different use history, etc., there are differences in the voltage, capacity, internal resistance and self-discharge rate, and if these differences are not properly controlled during the charging and discharging process, they will be further increased, resulting in some batteries. Overcharge and discharge phenomena, the capacity and life of these batteries will drop sharply, eventually leading to accidents

[0004] A traditional battery management system generally has a battery voltage detection unit, a current detection unit, and a temperature detection unit, and also includes high and low voltage, high and low temperature, and overcurrent alarm functions. The battery management system basically only monitors the operating status of the battery pack. With the rapid development of new energy and electric vehicles, in recent years, the battery management system including battery balancing function has an increasing market demand, but most battery management systems with balancing systems only perform balancing management on the entire battery pack, and It does not involve the management and control of each single battery in the battery pack, so the development of a battery management system that can manage each single battery in the battery pack is necessary

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