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Dynamic monitoring method of lithium battery temperature based on ofdr

A dynamic monitoring and lithium battery technology, applied in thermometers, thermometers with physical/chemical changes, measuring electricity, etc., can solve the problems of complex temperature sensor layout and easy measurement results to be affected by the outside world, and achieve comprehensive monitoring and high temperature resolution. High, high data refresh rate effect

Active Publication Date: 2022-03-22
武汉昊衡科技有限公司
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Problems solved by technology

[0004] Aiming at the problems of complex layout of traditional temperature sensors and easy external influence on measurement results, the present invention proposes an OFDR-based lithium battery temperature dynamic monitoring device and method for real-time monitoring of lithium battery temperature and over-temperature warning

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  • Dynamic monitoring method of lithium battery temperature based on ofdr
  • Dynamic monitoring method of lithium battery temperature based on ofdr
  • Dynamic monitoring method of lithium battery temperature based on ofdr

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] Such as figure 1 As shown, the OFDR-based new energy electric vehicle lithium battery temperature dynamic monitoring device of the embodiment of the present invention includes a linear frequency sweep laser 1, an optical fiber beam splitter 2, an optical fiber circulator 3, a distributed optical fiber network 4, and an optical fiber coupler 5. Photoelectric detector 6, data acquisition card 7, computer 8 and alarm module 9. The linear sweep laser 1 is connected to the input d end of the fiber beam splitter 2, its output e end is connected to the a port of the optical fiber circulator 3, and...

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Abstract

The invention discloses a method for dynamically monitoring the temperature of a lithium battery based on OFDR. The method comprises: the signal light returned through the distributed optical fiber network and the reference light undergo beat frequency interference to generate a beat frequency interference signal; the sensor in the distributed optical fiber network The optical fiber is arranged horizontally or vertically on the upper and lower surfaces and sides of the lithium battery pack, or buried between a single lithium battery pack; the beat frequency interference signal is collected to obtain a reference spectrum; the strain or temperature at the transverse starting position of the sensing fiber is changed to collect the beat frequency The interference signal is used to obtain the measurement spectrum; the reference spectrum and the measurement spectrum are processed to obtain the Rayleigh scattering spectrum of the measurement light and the reference light, and the cross-correlation peak deviation value of each position is calculated, combined with the strain or temperature frequency shift coefficient, the final position is obtained ‑Strain or position‑temperature graph, record the coordinates of the strain or temperature sudden change in the graph; draw the two-dimensional temperature field of the lithium battery in real time and in equal proportions, and perform dynamic monitoring of the lithium battery temperature.

Description

technical field [0001] The invention relates to the field of temperature detection, in particular to a method for dynamically monitoring the temperature of a lithium battery based on OFDR. Background technique [0002] With the rapid development of power battery technology, lithium batteries with high specific energy and high specific power are widely used in electric vehicles, toys, electric vehicles, electronic digital products, energy storage and other industries. Since lithium batteries are usually used as energy supply devices through individual battery packs connected in series and parallel to form battery panels, the difference in balance and ventilation between the monomers will cause inconsistent temperatures of lithium batteries at different locations under the same working load, which is not conducive to energy utilization. Efficient utilization and extension of battery life. Therefore, during long-term use, it is necessary to monitor the temperature of each part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/3206G01R31/389G01R31/396
CPCG01K11/3206
Inventor 王辉文张晓磊温永强王希
Owner 武汉昊衡科技有限公司
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