Lithium battery charge and discharge protection circuit and power module

Abstract

The invention discloses a charging and discharging protection circuit and a power supply module of a lithium battery pack. The circuit comprises a pull-up resistor, a voltage discrimination circuit, a charging delay circuit, a short circuit protection circuit, a charging control circuit and a discharging control circuit; the charging control circuit The circuit is connected to the negative electrode of the charging and discharging terminal of the lithium battery; the discharge control circuit is connected to the negative electrode of the lithium battery; the short-circuit protection circuit is connected to the discharging control circuit; the voltage discrimination circuit is connected to the negative electrode of the charging and discharging terminal and the charging delay The circuit is connected, and after the short-circuit fault is eliminated, the charging-type delay circuit is controlled to be turned on; the charging-type delay circuit is connected with the short-circuit protection circuit for releasing the circuit protection. The invention adopts the voltage discriminating circuit to open or close the rechargeable delay circuit, and can automatically cut off the discharge end of the lithium battery pack when the load is short-circuited; after the short-circuit fault is eliminated, the rechargeable delay circuit is turned on through the voltage discriminating circuit to eliminate the short-circuit protection, Automatically restores the power supply of the lithium battery pack.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a charging and discharging protection circuit and a power module of a lithium battery pack. Background technique [0002] In the field of battery management technology, due to short circuit and overcharging, the battery performance and life of lithium battery packs will decline, and even cause serious safety hazards such as smoke, fire, and explosion. [0003] The power of the traditional lithium battery charge and discharge control and short-circuit protection circuit is relatively small. If the output current of the battery pack is increased, the reliability of the circuit will be greatly affected when a large-power vehicle or electrical appliance is driven. In order to avoid This kind of influence often adopts the method of blown fuse or recoverable fuse. This kind of structure often has complicated production process, high requirements on fuse, and the response to ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a lithium battery pack charge and discharge protection circuit and a power module. The present invention uses a voltage discrimination circuit to turn on or off the charging delay circuit. When a load short circuit occurs, the lithium battery pack can be automatically cut off. The charging end of the lithium battery pack is short-circuit protected; after the short-circuit fault is eliminated, the charging delay circuit is turned on through the voltage discrimination circuit to eliminate the short-circuit protection, and the power supply of the lithium battery pack is automatically restored, which solves the current lithium battery charge and discharge control and short-circuit protection circuit. Low safety performance, but high maintenance costs, poor user experience, and not subject to high current factors, high reliability

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