Power-off system for battery pack of electric car

Abstract

The invention relates to the field of electric car battery pack systems and discloses a power-off system for a battery pack of an electric car. The power-off system comprises a battery pack circuit combining device, a relay driving control circuit and a state detecting circuit; the battery pack circuit combining device comprises a battery pack positive and negative loop and a battery pack pre-charging loop, and relays are connected into the battery pack positive and negative loop and the battery pack pre-charging loop in series; the relay driving control circuit is electrically connected with the battery pack circuit combining device to control on-off of the relays in the battery pack circuit combining device; the state detecting circuit is electrically connected with the battery pack circuit combining device to detect the electric potentials of the connecting points of the battery pack circuit combining device as well as an electric car controller, a series connection battery set and a charging pile; and the relay driving control circuit and the state detecting circuit are connected with a battery management system. According to the power-off system for the battery pack of the electric car, the battery pack circuits are managed, and the working states of the circuits and the state of the series connection battery set are detected, so that isolation of high-low voltage signals is achieved, electric shock hazards and device damage are reduced, and circuit burnout in battery charging is avoided.

Description

technical field [0001] The invention relates to the field of electric vehicle battery pack systems, in particular to an electric vehicle battery pack power-off system. Background technique [0002] Electric vehicles are the current research hotspot. One of its core technologies is the battery management system, and an important part of the battery management system is to effectively control the high-voltage power-off unit; to meet the needs of normal charging, discharging and corresponding protection. In the prior art, due to the lack of specific standards, the application circuit structure of the high-voltage control and protection part is not perfect, and there is a lack of a system that can uniformly detect and manage the peripheral connection circuits of series battery packs. In the existing system, it is impossible to isolate the high-voltage electrical signal and the low-voltage electrical signal, which may easily cause hardware damage and detection errors. Contents ...

AI Technical Summary

Problems solved by technology

In the prior art, due to the lack of specific standards, the application circuit structure of the high-voltage control and protection part is not perfect, and there is a lack of a system that can uniformly detect and manage the peripheral connection circuits of series battery packs

In the existing system, it is impossible to isolate high-voltage electrical signals and low-voltage electrical signals, which may easily cause hardware damage and detection errors

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