Overcurrent detection protection circuit for lithium battery protection board

Abstract

The invention discloses an overcurrent detection protection circuit for a lithium battery protection board, which is used for protecting a load and characterized in that the positive electrode of a lithium battery is connected with the positive electrode of the load, the negative electrode of the lithium battery is connected with the negative electrode of the load through a shunt resistor and a second switch tube, the shunt resistor is connected with a pin 1 of a comparator IC through a fifth resistor, a voltage reference circuit is connected with a pin 3 of the comparator IC, and a pin 4 of the comparator IC is connected with a grid electrode of the first switch tube through a time delay circuit; a logic IC group includes a first logic IC and a second logic IC, a drain electrode of the first switch tube is connected with a pin 5 and a pin 6 of the second logic IC through a tenth resistor, a pin 4 of the second logic IC is connected with a pin 1 and a pin 2 of the first logic IC through an eleventh resistor, and a pin 3 of the first logic IC is connected with a grid electrode of the second switch tube through a thirteenth resistor. The technical scheme of the invention aims to carry out reliable and effective protection on the battery. In addition, the overcurrent detection protection circuit has the advantages of simple and effective topology structure, low cost and higher reliability.

Description

technical field [0001] The invention relates to the field of lithium battery protection, in particular to an overcurrent detection and protection circuit for a lithium battery protection board. Background technique [0002] Due to the wide application of lithium battery technology, lithium battery project applications are more or less used in all walks of life, but because of the wide range of applications. Considering the material activity of lithium batteries, special attention should be paid to safety during use, so a battery protection board system is needed to ensure the safety of the battery during use, so that the voltage and current during actual use do not exceed the lithium battery itself security range. Then a reliable protection system is needed to monitor and protect the battery system so that it can be guaranteed within its safe range. Among them, the protection of overcurrent protection and short circuit protection in the use of lithium batteries is particul...

AI Technical Summary

Problems solved by technology

If the over-current value and delay or short-circuit value and delay parameters are not accurate enough, especially for high-current discharge loads, there may be over-protection or no protection effect for different load conditions.

[0003] At present, the existing hardware battery protection board technology uses a fixed value threshold and a fixed detection delay to detect the load current for protection against over-current or short-circuit protection. In the process of over-current and short-circuit protection, it cannot really meet the load matching of different attributes.

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