High voltage battery pack output short circuit protection circuit

Abstract

The invention relates to an output short-circuit protection circuit for a high tension battery. The output short-circuit protection circuit structurally comprises a detection control circuit, a switch circuit, a choke circuit, a load capacity match circuit and a switch buffer circuit. According to the output short-circuit protection circuit, the voltage of the load capacity match circuit or the choke circuit is detected by the detection control circuit, after the output short circuit is confirmed, the switch circuit is controlled to be switched off rapidly; after the switch buffer circuit is arranged, the switch circuit realizes the zero-voltage switching on and off, so that the energy impact and the voltage impact to the switch circuit can be reduced; and therefore, the switch circuit can be safely switched on and off. The short-circuit current is limited by the choke circuit, so that the energy impact to the battery and the switch circuit can be reduced. After the short-circuit fault is eliminated, the switch is controlled to be switched on by detecting the voltage condition of the detection control circuit, so that the battery can be reset to normally supply power.

Description

technical field [0001] The invention relates to a power protection circuit, in particular to an output short-circuit protection circuit of a high-voltage battery pack. Background technique [0002] With the development of science and technology, the application of battery packs has become more and more extensive, so the requirements for its safety performance have also increased accordingly, especially for vehicle power battery packs with large capacity and high voltage. The output of the battery pack is short-circuited, that is, for some reason, the positive and negative poles of the output of the battery pack are connected to each other with a very small resistance. This short circuit can generate excessive current and excessive heat, causing the life of the battery pack to be severely compromised. Due to the excessive heat generated by the short circuit, it will generate a high temperature enough to melt ordinary metals before the circuit breaks, which will easily lead t...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a high-voltage battery pack output short-circuit protection circuit to solve the problems of the existing high-voltage battery pack output short-circuit protection circuit switch circuit with large turn-off stress, large short-circuit current, and capacitive loads that easily lead to false protection problems.

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