Method and system for preventing fault misjudgment of battery management system

Abstract

The invention discloses a method for preventing fault misjudgment of a battery management system. The method comprises the steps that fault information is detected and first timing is started; when the first timing reaches first preset time, the fault information is still detected; 'first fault diagnose' is marked with a position bit; the power of a battery package is controlled to decline to a preset power at a first power speed, or the current of the battery package is controlled to decline to a preset current at a first current speed; the fault information is detected once every second preset time, and second timing is started; whether or not the fault information is detected again in third preset time is judged; if yes, 'second fault diagnosis' is marked with a position bit; the powerof the battery package is controlled to decline from the preset power to a limit power at a second power speed, or the current of the battery package is controlled to decline from the preset current to a limit current at a second current speed, and a relay of the battery package is controlled to be disconnected. The invention further discloses a system for preventing fault misjudgment of the battery management system.

Description

【Technical field】 [0001] The invention relates to the technical field of electric vehicles, in particular to a method and system for preventing misjudgment of a battery management system failure. 【Background technique】 [0002] With the rapid development of the new energy industry, new energy products are gradually popularized, and the safety of new energy products has attracted more and more people's attention. Therefore, improving the safety of new energy products has become the research focus of researchers in the new energy industry. BMS (BATTERY MANAGEMENT SYSTEM, battery management system) is the central control brain part of new energy battery products, and the stability of its operation affects the safety of the product. However, when the BMS is operating in a poor environment, it may be interfered by communication, which may lead to false detection and misjudgment, which will lead to the failure of the fault detection of the BMS, resulting in false alarms and abnorm...

AI Technical Summary

Problems solved by technology

However, when the BMS is operating in a poor environment, it may be interfered by communication and cause false detection and misjudgment, which will lead to the failure of the fault detection of the BMS, resulting in false alarms and abnormal shutdown of the product.

The abnormal stop of new energy products will aggravate the damage of product components and batteries, and in severe cases, it may cause short circuit fires in the product circuit or sudden stop of new energy vehicles during driving, resulting in traffic accidents

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