Method for realizing double backup BMS (Battery Management System) by single equipment

Abstract

The invention relates to the related field of new energy lithium battery energy storage, in particular to a method for realizing a double-backup BMS (Battery Management System) by single equipment, which alternately acquires information of two packs through a BMU monitoring circuit, only increases the cost of a switching circuit, and is beneficial to mass deployment; the switching circuit adopts a voltage follower circuit as a switch, so that the defects of inaccurate voltage acquisition, limited service life of a relay, incapability of adapting to high-frequency switching action and the like caused by self voltage drop of a semiconductor element switching tube are avoided; a voltage follower circuit is used as a switch, and because a core element of the voltage follower circuit is an integrated operational amplifier, circuit fluctuation and pulse peaks caused by a high-frequency switch are prevented by utilizing the virtual short and virtual off characteristics of the integrated operational amplifier; data between the two BMU monitoring circuits can be compared and corrected mutually, so that the sampling result is more credible, and errors caused by repeated sampling of the same equipment are avoided; data generated by double backups of the whole circuit is not increased, so that extra pressure on bus communication is not generated, and the delay time of the whole system is not increased.

Description

technical field [0001] The invention relates to the field related to new energy lithium battery energy storage, in particular to a method for realizing dual-backup BMS with a single device. Background technique [0002] With the country's policy inclination towards the new energy industry, lithium batteries are widely used in many fields. As an important guarantee for the safe operation of the lithium battery energy storage system, the BMS system has become more and more important. In general, the BMS data acquisition slave board BMU is responsible for monitoring the voltage, current, temperature and other information of a battery pack (pack). However, in some special demand scenarios, in order to ensure the absolute reliability of the equipment, dual backup redundant BMUs will be used. Even if one is damaged, the data collection of the entire BMS equipment will not be affected. However, double backup means double the cost, which is not conducive to practical application. ...

AI Technical Summary

Problems solved by technology

However, double backup means double the cost, which is not conducive to practical application. In view of the above problems, a method for realizing dual backup BMS with a single device is designed.

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