Intelligent power lithium ion battery management system and charging control method

Abstract

The invention relates to an intelligent power lithium ion battery management system. The system comprises a microcontroller module, an acquisition module, a storage module, a safety protection module, a communication module, a charging and discharging control module and an equalization management module, wherein the acquisition module, the storage module, the safety protection module, the communication module, the charging and discharging control module and the equalization management module are connected to the microcontroller module. The charging method comprises the following steps that according to a single battery voltage collected by the acquisition module, a total voltage of a battery pack, a temperature, a current and other information, whether the battery allows to be charged is determined; if the battery allows to be charged, the battery management system automatically adjusts a charging mode to the battery pack; through CAN communication, an output current of an equalization power supply module is automatically adjusted; equalization charging is performed on a single battery with a low voltage till that differential voltages of all the single batteries are less than a threshold. By using the system and the method of the invention, according to data information of the battery pack, a charging mode can be automatically selected, a charging current is automatically matched, a charging protection function is possessed, charging efficiency of the battery pack can be increased and a circulation service life of the battery pack is prolonged.

Description

technical field [0001] The invention belongs to the field of power battery management systems, in particular to a battery management system for power lithium-ion batteries and a charging control method thereof. 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, low self-discharge rate, high energy density, and long cycle life. 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] The existing lithium battery management system has a single charging strategy and mostly uses constant current charging, which cannot be charged reasonably according to the characteristi...

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] The existing lithium battery management system has a single charging strategy and mostly uses constant current charging, which cannot be charged reasonably according to the characteristics of the battery. Often the charging efficiency is not high and it is easy to cause damage to the lithium-ion battery and shorten its service life.

At the same time, most lithium battery management systems adopt passive equalization, which has low equalization efficiency and easily leads to heat management problems.

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