Method for realizing online monitoring on energy storage cell safety state

Abstract

The invention relates to a method for online monitoring of the safety status of an energy storage battery. The method includes the following steps: determining the battery thermal runaway warning temperature; and providing early warning of battery thermal runaway. This method is based on the study of the reaction between the internal materials of the battery and the electrolyte. Through the research results of the temperature of the exothermic reaction between the internal materials of the battery and the electrolyte at different decay stages of the battery, it is possible to determine the temperature of the battery when the battery is in different stages of capacity decay. Out-of-control early warning temperature. Based on this research result, a method of using micro wireless sensors to detect the internal temperature of the battery is used. When the sensor detects the internal temperature of the battery, it is compared with the corresponding early warning value obtained from the research results, thereby realizing the detection of battery thermal Early warning of loss of control.

Description

Technical field: [0001] The invention relates to a method for monitoring the safety state of a battery, and more particularly to a method for on-line monitoring the safety state of an energy storage battery. Background technique: [0002] Clean renewable energy such as wind energy and solar energy have begun to be widely used. However, due to the intermittent and discontinuous nature of solar energy and wind energy, energy storage technology needs to be applied to improve the continuity and stability of energy supply. At present, the most widely used energy storage technology is electrochemical energy storage, that is, the discontinuous and unstable renewable energy is stored in the battery first, and then released from the battery when needed. [0003] The energy storage battery is an energy carrier, and the batteries currently used in energy storage technology have a high energy density. During the use of these batteries, due to improper use and the decline in their own sa...

AI Technical Summary

Problems solved by technology

However, this method has obvious shortcomings. The potential safety hazards of the battery generally exist inside the battery, and its thermal runaway is also caused by the internal reaction of the battery. It is impossible to directly and accurately predict the internal changes of the battery only by measuring the external parameters of the battery. When extreme conditions such as thermal runaway occur in the battery, early warning cannot be achieved only by the current parameter measurement, and the current measured temperature is the temperature on the surface of the battery case, which is affected by the poor thermal conductivity of the battery material and the slow heat transfer rate. , temperature measurement points and other factors, the temperature cannot accurately and timely reflect the internal temperature of the battery

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