Single battery temperature and pressure gas composite sensing optical fiber probe, system and application

Abstract

The invention discloses a single battery temperature and pressure gas composite sensing optical fiber probe, a system and application. A single battery temperature and pressure gas composite sensing optical fiber probe, a temperature and pressure sensing optical fiber probe and a gas sensing optical fiber probe; the temperature and pressure sensing optical fiber probe comprises a first single-mode optical fiber, a germanium-doped single-mode optical fiber and a microstructure optical fiber which are connected in sequence; a commercial single-mode fiber Bragg grating is engraved on the germanium-doped single-mode fiber and is used for sensing temperature; a pressure sensitization fiber bragg grating is engraved on the microstructure fiber and is used for sensing pressure; and the gas sensing optical fiber probe comprises a second single-mode optical fiber and a hollow-core light guide optical fiber which are connected with each other. The battery temperature and pressure gas quasi-distributed optical fiber sensing system comprises a sensing module, a demodulation module and a multi-path optical switch module, the sensing module comprises a plurality of temperature and pressure gas single battery composite sensing optical fiber probes. The safety of the power battery pack is effectively guaranteed by monitoring the temperature and pressure gas of the single batteries in real time.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a single battery temperature, pressure and gas composite sensing optical fiber probe, system and application. Background technique [0002] In the field of battery sensing, key monitoring indicators include operating voltage, temperature, internal pressure, and the type and concentration of gases generated by electrolyte decomposition. At present, battery safety monitoring is limited to the surface temperature of the battery. Traditional temperature sensing solutions include: thermocouple, thermistor, acoustic probe, electrochemical impedance spectroscopy )Wait. However, these solutions can only sense the shell temperature on the surface of the battery, even if the internal center temperature of the battery can be estimated by analyzing the heat conduction model, and the temperature data can be used to infer whether the battery has reached a state of thermal runaway and then ju...

AI Technical Summary

Problems solved by technology

At present, the safety detection of the power battery pack only stays on the temperature of the entire battery module, and does not involve the internal temperature and pressure of each single battery, as well as the CO and CO produced by the decomposition of the electrolyte during thermal runaway. 2 And a variety of VOC gases, there is a great potential safety hazard

Images