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

Abstract

The invention discloses a fiber grating sensor for temperature measurement of a lithium battery pack and a temperature measurement method thereof. The fiber grating sensor comprises an optical fiber,one or more fiber gratings are arranged on the optical fiber, and a packaging mechanism is arranged outside the fiber gratings; the packaging mechanism is provided with a hole matched with the shape of a lithium battery pole. During temperature measurement, the fiber grating provided with the packaging mechanism is installed on the pole column of each single lithium battery, and each fiber gratingmonitors the temperature of the corresponding single lithium battery; the fiber is connected to a fiber grating demodulator to measure the reflection central wavelength of each fiber grating; according to the relationship between the reflection center wavelength and the temperature, the temperature value of the corresponding single lithium battery can be obtained through calculation, the sensor can be conveniently installed on the pole column of each single battery of the lithium battery pack, temperature monitoring of each single battery is achieved, and as the optical fiber is an optical passive device, the sensor is high in anti-interference capacity and high in 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...

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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 numb

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