A fiber grating sensor for temperature measurement of lithium battery pack and temperature measurement method thereof

Abstract

The invention discloses an optical fiber grating sensor for measuring the temperature of a lithium battery pack and a temperature measuring method thereof. A hole adapted to the shape of the pole of the lithium battery is provided. When measuring temperature, install the fiber grating with packaging mechanism on the pole of each lithium battery cell, and each fiber grating monitors the temperature of the corresponding lithium battery cell; connect the optical fiber to the fiber grating demodulator That is, the reflection center wavelength of each fiber grating is measured, and then according to the relationship between the reflection center wavelength and temperature, the temperature value of the corresponding lithium battery cell is calculated. The sensor can be easily installed on each battery cell of the lithium battery pack On the pole, the temperature monitoring of each battery cell is realized. Since the optical fiber is an optical passive device, it has strong anti-interference ability and high reliability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber grating sensor for measuring the temperature of a lithium battery pack and a temperature measuring method thereof. Background technique [0002] As a new type of fiber optic passive device, the fiber optic grating sensor has the advantages of all-optical transmission, anti-electromagnetic interference, corrosion resistance, high electrical insulation, low transmission loss, wide measurement range, easy multiplexing into a network, and miniaturization. It has received widespread attention worldwide and has become one of the fastest-growing technologies in the field of sensing, and has been widely used in civil engineering, aerospace, petrochemical, electric power, medical, shipbuilding and other fields. [0003] Electrochemical energy storage is currently the most cutting-edge energy storage technology. Among them, lithium-ion batteries h...

AI Technical Summary

Problems solved by technology

During the working process of lithium batteries, due to the internal chemical and electrochemical reactions and other reasons, a large amount of heat will accumulate to make the temperature too high, shortening its service life and causing safety problems, and the temperature differences and imbalances between lithium battery cells Sexuality will affect the life of the entire lithium battery pack

[0004] At present, the temperature monitoring of energy storage lithium battery packs generally adopts the method of thermistor or thermocouple. If you want to monitor each lithium battery cell in the lithium battery pack, you need a large number of devices, complicated wiring and other problems. The measurement signal is susceptible to interference from the electromagnetic environment

Therefore, the above two methods are not suitable for temperature monitoring of large-scale energy storage lithium battery packs

In addition, the existing method is mainly to fix the sensor on the shell or lug of the lithium battery for temperature monitoring. However, the pole generates the most heat during the working process of the lithium battery, which can better reflect the heat inside the lithium battery.

However, there is no sensor that measures the temperature of the pole in the prior art

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