Battery thermal runaway early warning processing method and device, equipment and storage medium

Abstract

The application provides a battery thermal runaway early warning processing method and device, equipment, and a storage medium. The method comprises the steps: acquiring current thermal runaway stateinformation of a target battery at current time; acquiring current fault information of acquisition equipment corresponding to the current thermal runaway state information; determining a current thermal runaway state information change result of the target battery based on the current thermal runaway state information and historical thermal runaway state information of the target battery at a first time, setting the first time to be the time of a preset time before the current time; performing early warning analysis on the current thermal runaway state information, the current fault information and the current thermal runaway state information change result based on a preset early warning model to obtain a current thermal runaway early warning level corresponding to the target battery; and performing thermal runaway early warning processing based on the current thermal runaway early warning level. According to the application, graded alarming and processing can be realized, the earlywarning cost is reduced, and the thermal runaway early warning function can be normally carried out under the condition that some sensors fail.

Description

technical field [0001] The application belongs to the technical field of lithium batteries and electric vehicles, and specifically relates to a battery thermal runaway early warning processing method, device, equipment and storage medium. Background technique [0002] With the rapid development of lithium-ion batteries, especially lithium-ion power batteries in the practical application process, with the occurrence of more and more frequent electric vehicle fire accidents, almost all electric vehicle fire incidents are related to power batteries. At present, due to the inherent problems in the raw materials and production process of lithium-ion power batteries, absolute safety during use cannot be achieved. The main safety hazards are thermal runaway and thermal runaway diffusion during battery use. Thermal runaway generally refers to the chain reaction caused by the heat release of the single battery, which leads to a sharp change in the temperature rise rate of the battery...

AI Technical Summary

Problems solved by technology

However, method 1) cannot warn of thermal runaway of the battery in advance, but only starts when the flame inside the battery system accumulates to a certain extent, causing serious consequences of open flame combustion, and the structure is complex, which destroys the overall structure and sealing of the battery box; method 2) requires Real-time monitoring of each single battery is low in economy and practicability; and a fixed temperature change rate threshold is used as the calibration basis for the temperature range, which cannot meet the needs of different types of single batteries; method 3) needs to rely on multiple The sensor performs detection, the structure is complex, its functional design and the battery management system (BMS) are redundant, the safety risk and cost are high; and this method does not consider the power loss in the process of performing sensor work, especially when the vehicle is in a deactivated state The power loss of the lower electrical appliances can easily lead to the 12V power supply on the vehicle. For example, the working principle of the smoke sensor is to realize the early warning of thermal runaway by monitoring the light wave penetration rate between the generator and the receiver, which needs to consume energy continuously to stimulate the light source; Under the impact of battery thermal runaway and high temperature gas flame, the electronic components and communication harness of the sensor are easily damaged. This method does not have an early warning judgment logic for the sensor failure mode (FTA). In practical applications, there are problems caused by the complexity of vehicle driving conditions. Risk of misjudgment or omission

Images