Early warning and alarming method for blowout of power lithium ion battery

Abstract

The invention provides an early warning and alarming method for blowout of a power lithium ion battery. Five parameters including temperature, air pressure, CO, CXHX and pressing force are used to perform warning and alarming judgment, at least multiple levels of preset values from low to high are set for each parameter, and the warning and alarming level is judged according to the preset value level of the acquired parameters. According to the invention, multistage warning and alarming is carried out for thermal runaway of the battery by adopting multistage and diversified parameters, so thatthe thermal runaway state of the battery can be accurately controlled in real time.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to an early warning device and method for explosive spraying of power lithium-ion batteries. Background technique [0002] With the continuous development of the global economy, the energy crisis has gradually deepened, and the awareness of environmental protection has continued to increase. As a new energy and environmentally friendly and low-carbon power battery industry, it has developed rapidly. Lithium-ion batteries have become the choice of many power batteries due to their excellent performance and mature technology. mainstream development direction. Especially as our country pays more and more attention to environmental protection issues, and the production cost of lithium batteries has been greatly reduced, it has been widely used in electric bicycles, electric vehicles, high-speed rail, cloud rail, aerospace and other transportation fields as well as power ...

AI Technical Summary

Problems solved by technology

The temperature parameter is judged by the temperature and its rate of change. When the temperature and its rate of change exceed a certain threshold, it is judged that thermal runaway has occurred. However, due to the large number of batteries in the battery module and the battery box, it is impossible to pass the BMS and itself. The arranged temperature sensor collects the temperature data of each battery, which leads to a great delay in the thermal runaway warning and a large number of misjudgments; the voltage parameters are judged by the voltage drop and its rate of change, when the voltage drop and its rate of change When a certain threshold is exceeded, it is judged that thermal runaway has occurred. However, due to the large number of batteries and technical limitations in the battery module and battery box, the voltage data of each battery cannot be collected through the BMS, resulting in a huge thermal runaway warning. Delay, and a large number of misjudgments; gas composition, judged by gas composition such as CO and hydrocarbons and their rate of change, when the gas composition and its rate of change exceed a certain threshold, it is judged that thermal runaway occurs, but generally there is a change in gas composition At this time, thermal runaway and explosive spraying have occurred. At this time, the alarm has lost the meaning of early warning, and it is impossible to realize the early alarm before explosive spraying; the smoke concentration is judged by the smoke concentration and its change rate. When the smoke concentration and its change rate When a certain threshold is exceeded, it is judged that thermal runaway has occurred, but generally when smoke occurs, thermal runaway and explosion have already occurred. At this time, the alarm has lost the meaning of early warning, and it is impossible to realize early warning before explosion

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