Temperature measurement system and method of internal portion of lithium ion battery

Abstract

The present invention provides a temperature measurement system and method of an internal portion of a lithium ion battery. The system comprises a fiber bragg grating sensor, a fiber bragg grating interrogator and a data processing module; the fiber bragg grating interrogator is connected with the data processing module; the fiber bragg grating sensor comprises a grating and an optical fiber; thegrating is pasted at the internal portion of the lithium ion battery; and the optical fiber at the outer portion of the lithium ion battery is connected with the fiber bragg grating interrogator. According to the technical scheme, the accurate measurement of the temperature in the lithium ion battery is achieved, and the defect is overcome that a traditional measurement method cannot accurately measure the temperature in the lithium ion battery.

Description

technical field [0001] The invention relates to a temperature measurement system, in particular to a system and method for measuring the internal temperature of a lithium ion battery. Background technique [0002] With the widespread application of lithium-ion batteries in electronic products and electric vehicles, the safety issues during the use of lithium-ion batteries have attracted more and more attention. Among the physical quantities that affect the safety of lithium-ion batteries, temperature is a very important influence. factor. Temperature has an impact on the performance of lithium-ion batteries in all aspects, including the working conditions of the electrochemical system, cycle efficiency, capacity, power, safety, reliability, consistency, and life. Therefore, it is very important to measure the temperature of the lithium-ion battery. [0003] Currently, commonly used temperature measurement methods for batteries include thermocouples and infrared imaging. Al...

AI Technical Summary

Problems solved by technology

[0003] Currently, commonly used temperature measurement methods for batteries include thermocouples and infrared imaging. Although the two technologies have made good progress in battery temperature measurement, they both have certain defects.

Thermocouples need to use metal wires, which are prone to short circuit hazards, and the metal materials used are often very hard, which brings a lot of inconvenience to installation and use; infrared imaging technology uses infrared signals emitted by objects to measure, which is easily disturbed by airflow and accuracy. Not enough, and it needs to be corrected according to the emissivity of different measured objects when using it, and the follow-up data processing work is complicated

And due to the strong corrosive environment inside the lithium-ion battery, the two traditional temperature measurement methods can only measure the temperature on the surface of the lithium-ion battery, and cannot accurately measure the temperature inside the lithium-ion battery

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