Relay bilateral control and diagnosis circuit and method and battery management system

Abstract

The invention discloses a relay bilateral control and diagnosis circuit, a relay bilateral control and diagnosis method and a battery management system. The circuit comprises a power supply end, a grounding end, a diagnosis power supply, a high-side control module, a low-side control module, a control module and a diagnosis switch, the first end of the high-side control module is electrically connected with the power supply end, the second end of the high-side control moduleis electrically connected with the first end of the relay, and the control end of the high-side control moduleis electrically connected with the control module; the first end of the low-side control module is electrically connected with a grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module; the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module; the first voltage sampling end of the control module is electrically connected with the first end of the relay, and the second voltage sampling end of the control moduleis electrically connected with the second end of the relay. According to the embodiment of the invention, accurate control and fault detection of the relay can be realized.

Description

technical field [0001] Embodiments of the present invention relate to relay control technology, in particular to a relay bilateral control and diagnosis circuit, method, and battery management system. Background technique [0002] With the increasing demand for energy and environmental protection, electric vehicles, as a new type of transportation, have become the development trend of modern vehicles due to their advantages of cleanliness, pollution-free, and high energy efficiency. [0003] As the power source of electric vehicles, power batteries are an indispensable part of electric vehicles. The power battery is connected or disconnected from the external circuit of the vehicle through the on-off of its internal relay. When the relay cannot be controlled or fails, the battery management system (BMS) cannot realize the opening and closing of the relay by cutting off the low-voltage drive of the relay. Especially when the main positive relay and the main negative relay c...

AI Technical Summary

Problems solved by technology

Due to the simple structure of the traditional control method, once the single-chip microcomputer instruction is given wrongly or the memory circuit is subjected to large electromagnetic interference from the outside, it is easy to cause the relay to switch incorrectly. The robustness of the system is not high. Capable of diagnosing relay failures

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