Discharging current hardware protection circuit for vehicle-mounted lithium battery pack of electric vehicle

Abstract

The invention is applicable to battery protection, and provides a discharging current hardware protection circuit for a vehicle-mounted lithium battery pack of an electric vehicle. The discharging current hardware protection circuit comprises a signal sampling unit used for sampling the load current of the electric vehicle, and converting the sampling current into a sampling voltage to output; a detection unit used for outputting a high-level signal when the detected sampling voltage achieves a preset threshold value; and a hardware protection unit used for cutting off the connection between the lithium battery group and the vehicle load after the high-level signal is detected. According to the discharging current hardware protection circuit, when the lithium battery group of the vehicle is in short-circuit or overcurrent states, the hardware protection unit can response in time to automatically cut off the connection between the lithium battery group and the vehicle load; furthermore, due to the introduction of positive feedback to the detection unit, the output signal is relatively stable; in case that the detection unit determines that the lithium battery is in abnormal, the high level is output; even if the current fluctuation is not affected; the output signal is kept the same; and the output signal can be changed only by adopting software for unlocking.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle batteries, and in particular relates to a discharge current hardware protection circuit for a lithium battery pack mounted on an electric vehicle. Background technique [0002] In recent years, the environmental problems caused by traditional internal combustion engine vehicles and the shortage of oil resources have made people turn their attention to new energy vehicles. Pure electric vehicles have become an important development direction of electric vehicles because they can truly achieve "zero emission". With its excellent performance, lithium-ion batteries have become an ideal power source for the new generation of electric vehicles. However, there are also some problems in the wide application of lithium battery electric vehicles, such as battery discharge overcurrent, short circuit, etc., which will greatly shorten the battery life; therefore, during the use of lithium batteries, ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a discharge current hardware protection circuit for the on-board lithium battery pack of an electric vehicle, aiming at the problems of slow response and low reliability when the CPU is used for battery discharge monitoring in the prior art

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