Lithium battery pack charging and discharging protection circuit and power supply module

Abstract

The invention discloses a lithium battery pack charging and discharging protection circuit and a power supply module. The circuit comprises a pull-up resistor, a voltage discriminating circuit, a charging type delay circuit, a short-circuit protection circuit, a charging control circuit and a discharging control circuit; the charging control circuit is connected with the negative electrode of a charging and discharging end of a lithium battery pack; the discharging control circuit is connected with the negative electrode of the lithium battery pack; the short-circuit protection circuit is connected with the discharging control circuit; the voltage discriminating circuit is connected with the negative electrode of the charging and discharging end and the charging type delay circuit; after ashort-circuit fault is eliminated, the charging type delay circuit is controlled to start; the charging type delay circuit is connected with the short-circuit protection circuit; and circuit protection is removed. According to the lithium battery pack charging and discharging protection circuit and the power supply module disclosed by the invention, the charging type delay circuit is turned on orturned off by adoption of the voltage discriminating circuit; when a load is short-circuited, the discharging end of the lithium battery pack can be turned off automatically; after the short-circuitfault is eliminated, the charging type delay circuit is turned on through the voltage discriminating circuit, so that short-circuit protection is eliminated; and power supply of the lithium battery pack is automatically recovered.

Description

Technical field [0001] The present invention relates to the technical field of battery management, in particular to a lithium battery pack charging and discharging protection circuit and a power supply module. Background technique [0002] In the field of battery management technology, short circuit and overcharging will cause the battery performance and life of the lithium battery pack to decline, and even cause serious safety hazards such as smoke, fire, and explosion. [0003] The power of the traditional lithium battery pack 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 driving by higher-power vehicles or electrical appliances. In order to avoid This kind of influence often adopts blown fuse or recoverable fuse. This structure often has complicated production process, high requirements for fuse, and not sensitive enough 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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