Intelligent lithium-ion battery management system for electric vehicles and its equalization control method

Abstract

The invention relates to an intelligent lithium-ion battery management system for electric vehicles, which is characterized in that: a microcontroller module, a power supply module, a data detection module, a charging and discharging control module, a safety protection module, a communication module, a data storage module and a balance management module connect. The equalization control method includes: performing an equalization self-test according to the collected voltage data of each single battery in the battery unit; if the equalization self-test passes, judging whether to enable the equalization control; if the difference between the single battery voltage and the average voltage is greater than the set threshold Voltage, and when the voltage of a single cell is greater than the set threshold, the PWM duty cycle obtained according to the voltage of the single cell is used as the equalization time for equalization control; otherwise, no equalization control is performed. The invention is a centralized battery management system, which has the characteristics of small size, stable performance, high detection accuracy, low cost, strong reliability and the like.

Description

technical field [0001] The invention belongs to the field of power battery management systems, in particular to a battery management system for lithium-ion power batteries. Background technique [0002] With the development of electric vehicles and hybrid power tools, various power batteries are widely used. Lithium batteries have become the most promising power batteries due to their small size, high energy density, long cycle life, and low self-discharge rate. However, the safety and stability of lithium batteries are not high, and overcharging and overdischarging will cause damage to lithium-ion batteries. Therefore, in order to ensure the safe operation of lithium-ion batteries, a high-performance battery management system must be equipped. [0003] Existing lithium-ion protection devices for electric vehicles mostly use lithium-ion battery protection boards to achieve some basic protection functions, have no storage function, have low balancing accuracy, and cannot pro...

AI Technical Summary

Problems solved by technology

However, the safety and stability of lithium batteries are not high, and overcharging and overdischarging will cause damage to lithium-ion batteries. Therefore, in order to ensure the safe operation of lithium-ion batteries, a high-performance battery management system must be equipped.

[0003] Existing lithium-ion protection devices for electric vehicles mostly use lithium-ion battery protection boards to achieve some basic protection functions, have no storage function, and the balance accuracy is not high, nor can they provide users with intuitive and comprehensive battery monitoring information

Even if the lithium battery management system is adopted, due to the high cost, large size and high power consumption of the existing lithium battery management system, it is difficult to apply it to electric vehicles with low cost and small capacity power batteries

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