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Lithium battery temperature dynamic monitoring method based on OFDR

A dynamic monitoring and lithium battery technology, applied in thermometers, thermometers with physical/chemical changes, measuring devices, 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 temperature resolution High, solve the effect of complex layout

Active Publication Date: 2020-12-11
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

Method used

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  • Lithium battery temperature dynamic monitoring method based on OFDR
  • Lithium battery temperature dynamic monitoring method based on OFDR
  • Lithium battery temperature dynamic monitoring method 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 lithium battery temperature dynamic monitoring method based on OFDR. The method comprises the steps that: signal light returned by a distributed optical fiber network and reference light are subjected to beat frequency interference, so that beat frequency interference signals are generated, sensing optical fibers in the distributed optical fiber network are transversely or longitudinally arranged on the upper surface, the lower surface and the side face of a lithium battery assembly or buried between single lithium battery packs. the beat frequency interference signals are acquired, so that a reference spectrum is obtained; the strain or temperature of the transverse initial positions of the sensing optical fibers is changed, and beat frequency interference signals are acquired, so that a measurement spectrum is obtained; the reference spectrum and the measurement spectrum are processed, so that a Rayleigh scattering spectrum of the measurement light and the reference light is obtained, calculation is performed to obtain a cross-correlation peak deviation value of each position, on the basis of a strain or temperature frequency shift coefficient, a final position-strain or position-temperature curve graph is obtained, and coordinates of a strain or temperature sudden change position in the curve graph are recorded; and a two-dimensional temperature field of a lithium battery is drawn in real time in equal proportion, and the temperature of the lithium battery is dynamically monitored.

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 Applications(China)
IPC IPC(8): G01K11/32
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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