Charging and discharging protection circuit of lithium battery management system and lithium battery management system

Abstract

The embodiment of the invention discloses a charging and discharging protection circuit of a lithium battery management system and the lithium battery management system. The charging and discharging protection circuit of the lithium battery management system comprises a first power supply circuit, a starting circuit, a DC / DC conversion circuit, a control circuit and a voltage feedback circuit; thefirst power supply circuit is used for converting an AC voltage into a DC voltage and outputting the DC voltage from the output end; the voltage feedback circuit is used for feeding back the collected output voltage of the DC / DC conversion circuit to the control circuit, and the control circuit is used for adjusting a drive control signal output to the input end of the DC / DC conversion circuit according to the output voltage of the DC / DC conversion circuit. According to the technical scheme provided by the embodiment of the invention, the charging protection of the lithium battery is realized, the circuit structure is simple, and the cost is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power electronics, and in particular to a charging and discharging protection circuit of a lithium battery management system and the lithium battery management system. Background technique [0002] Due to the advantages of lithium batteries such as small size, high energy density, no memory effect, high cycle life, high voltage, and low self-discharge rate, more and more products such as mobile phones, cameras, electric vehicles, and Bluetooth devices begin to use lithium batteries as their main products. power supply. [0003] Due to the high energy density of lithium batteries, there are certain risks in the process of charging and discharging. When the lithium battery is in an overcharged state, the temperature of the lithium battery rises, causing the electrolyte inside the lithium battery to decompose and generate gas, which increases the internal pressure of the lithium batter...

AI Technical Summary

Problems solved by technology

Conversely, in the state of over-discharge, the decomposition of the electrolyte causes the charge-discharge characteristics and durability of the lithium battery to deteriorate, reducing the number of times the lithium battery is charged.

Many inferior lithium battery charging management systems are unreasonably designed, which will cause the lithium battery to be in danger of being overcharged or overdischarged, and the safety and reliability are low.

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