Lithium battery management system and method based on bridge-removing bistable relay

Abstract

The present invention discloses a lithium battery management system and method based on a bridge-removing bistable relay. The system comprises a lithium battery pack, a battery manager and a bridge-removing bistable relay. The method comprises: when an electrical is higher than an equalization unlatching point in voltage or less than an over-discharge protection point in voltage, an equalization device performs equalization of the electrical core; when the electrical core is higher than the over-discharge protection point in voltage, the bridge-removing bistable relay breaks and separates from the bridge, and the lithium battery pack stops to charge; and when the voltage of the electrical core is lower than the voltage of the over-discharge protection point and is higher than the voltage of an upper resetting point, the charging is stopped and goes on the equalization; when the voltage of the electrical core is lower than the voltage of the resetting point and is higher than the voltage of the equalization unlatching point, the bridge-removing bistable relay is closed and performs bridge removing, and the lithium battery pack recovers charging. On the basis of an interval voltage control method, a special device bridge-removing bistable relay is employed to design a novel lithium battery management method through combination of the equalization control technology and the upper resetting management mode so as to fully develop the performances and the service life of the lithium battery.

Description

technical field [0001] The technical field of lithium battery protection of the present invention particularly relates to a lithium battery management system and a method thereof based on an off-bridge type bistable relay. Background technique [0002] A battery is an energy body. For users, the stored electricity has a wide range of applications, and is currently receiving more and more attention from users. However, since lithium batteries have the highest energy density among known secondary batteries, energy management is also the most troublesome. [0003] The potential safety hazard of lithium batteries comes from overcharging, and the main contradiction of overcharging comes from the consistency of lithium batteries caused during use. Generally speaking, a power battery is composed of several cells connected in series. Due to various reasons, it is impossible for each cell to be exactly the same. Absolutely identical products do not exist. Then in battery managemen...

AI Technical Summary

Problems solved by technology

[0010] Now the traditional method is to use MOS tube as the protection switch, and the MOS tube is a semiconductor switch, which is very sensitive to high voltage and high current.

The battery is a relatively random energy body, which is difficult to manage. In the face of a complex load environment, the MOS tube is often overheated and damaged due to abnormal electricity, and the reliability is not ideal.

For example, electric bicycles with inductive loads, although they have experienced nearly 20 years of development, the promotion of lithium batteries is always not ideal

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