Lithium battery short circuit protection method and system

Abstract

The invention discloses a lithium battery short circuit protection method and system. The lithium battery short circuit protection method comprises the following steps: detecting a voltage signal on a detection resistor of main loop current inside a lithium battery system, and sequentially processing the voltage signal through a filter circuit and an amplification circuit so as to obtain a voltage value within a set delay time; comparing the voltage value with a preset protection threshold by comparing latch circuits, and outputting a result to a restoring circuit; if the comparison result shows that load short circuit is caused, transmitting a closing signal to a switching tube driving circuit through the restoring circuit, and closing a main output loop of a lithium battery through the switching tube driving circuit. By adopting the lithium battery short circuit protection method and the lithium battery short circuit protection system, the protection threshold and the set delay time can be flexibly adjusted, can be applicable to battery cells of different models and different application situations, and can be flexibly configured as manual restoring or automatic restoring, so that the battery can be applicable to multiple situations of manned monitoring, unmanned monitoring and the like, and the reliability and the practicability can be improved due to flexible closing and starting modes after protection.

Description

technical field [0001] The invention relates to the field of battery protection, in particular to a lithium battery short-circuit protection method and system. Background technique [0002] With the increasing use of lithium batteries in areas such as communication base stations, data centers, outdoor emergency, and home energy storage, the reliability requirements for lithium battery management systems are also getting higher and higher. As a very critical protection in the lithium battery management system, short circuit protection has an important impact on the reliability and stability of the entire system. [0003] Some of the existing lithium batteries use a lithium battery single-cell protection IC to implement short-circuit protection, and the protection threshold and delay time cannot be adjusted flexibly, and the recovery method is also very simple; some directly use the MCU interrupt signal for short-circuit protection processing. Then the delay time setting cann...

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Problems solved by technology

[0003] Some of the existing lithium batteries use a lithium battery single-cell protection IC to implement short-circuit protection, and the protection threshold and delay time cannot be adjusted flexibly, and the recovery method is also very simple; some directly use the MCU interrupt signal for short-circuit protection processing. Then the delay time setting cannot be accurate to the microsecond level, and the stability is poor

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