Electrochemical energy storage safety early warning system and method

Abstract

The invention discloses an electrochemical energy storage safety early warning system and method. The system is based on a distributed optical fiber sensing technology. On the basis of the characteristic that backscattered signals in an optical fiber are related to information such as the position, temperature and stress of any point on the optical fiber, the optical fiber is arranged along each battery in an energy storage system, and therefore, real-time temperature and stress monitoring on each battery in the energy storage system is realized. When one or more batteries in the energy storage system are abnormal, the system can quickly sense the abnormality, and can accurately position the specific position of the abnormal battery. By linking the system with an existing battery management system and an existing safety fire-fighting system, effective restraining measures can be taken for abnormal batteries in the energy storage system at the first time, and the spreading and expandingof dangerous situations caused by untimely discovery and inaccurate positioning are avoided. The safety early warning system can effectively improve the operation safety level of the energy storage system.

Description

technical field [0001] The invention relates to an electrochemical energy storage safety early warning system and method, belonging to the field of energy storage. Background technique [0002] Electrochemical energy storage technology represented by lithium-ion batteries is widely used in modern electronic devices such as smartphones and laptops due to its high energy density, long cycle life, low self-discharge rate, and environmental protection. In recent years, the application value of large-scale energy storage technology based on electrochemical batteries in new energy power generation, electric vehicles, smart grids and other fields has been increasingly reflected. [0003] Since the theoretical capacity of electrochemical batteries such as lithium-ion batteries far exceeds that of traditional lead-acid batteries, and the energy concentration is high, the size of lithium-ion batteries is usually designed to be small to control the capacity of the battery cells. For e...

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Problems solved by technology

However, the number of battery cells in the battery module is large and the arrangement is tight. Considering the data processing capability of the battery management system and the needs of battery ventilation and heat dissipation, it is impossible to arrange enough sensors in the battery module, so the existing battery management system cannot Achieve real-time and continuous status monitoring of each battery cell in the module

At present, battery manufacturers usually choose to arrange three thermocouples on the frame of the battery module to monitor the temperature. In this way, each battery cell in the module cannot be monitored. Thermal constraints cause a certain lag in monitoring, so when a battery cell has an abnormal working condition, the existing battery management system cannot sense it immediately, let alone accurately give the specific location of the battery cell in the energy storage system. Therefore, it is impossible to take effective measures at the initial stage of danger and cause greater losses

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