Battery optical fiber in-situ detection system and method

An in-situ detection and battery technology, applied in secondary battery testing, secondary battery, secondary battery repair/maintenance, etc. The effect of distance online in-situ detection, small size and small transmission loss

Active Publication Date: 2022-02-18
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the very high reactivity of metal lithium, the current conventional characterization techniques using high-energy rays (neutrons, electrons, X-rays) will destroy the original state of metal lithium, and the cost and size of the equipment are also very high. severely limited its application

Method used

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  • Battery optical fiber in-situ detection system and method
  • Battery optical fiber in-situ detection system and method
  • Battery optical fiber in-situ detection system and method

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Embodiment

[0052] Tilted Fiber Bragg Grating (TFBG) is a research hotspot in fiber optic sensors in recent years. Optical methods are used to write TFBG on the fiber core. Tilted Fiber Bragg Grating can break the cylindrical symmetry of the mode coupling process and promote Light is coupled from the core to different cladding modes. The spectrum of this fiber grating sensor is an excellent narrow-band resonant peak comb spectrum, which provides a high-precision measurement tool for monitoring various small modulation changes. The cut-off mode in the cladding mode of the tilted fiber Bragg grating has a deep evanescent light field intensity and penetration depth, and has a very high sensitivity to the change of the environmental refractive index, so the cut-off mode can be used to realize the detection of the external environment refractive index and branches. It provides a high-precision measurement method for the growth of dendrites on the surface of the internal electrode of the batter...

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Abstract

The invention discloses a battery optical fiber in-situ detection system and method. The system includes a light source, a spectrometer and an optical fiber sensor. The optical fiber sensor is a reflective optical fiber sensor or a transmissive optical fiber sensor. The optical fiber sensor is implanted inside the battery. It is closely attached to one or two electrodes inside the battery, and the battery is connected to a charging and discharging device, an external electric load or an electrochemical workstation. The present invention uses optical means to obtain electrical information, and implants a miniature optical fiber sensor into the battery to realize real-time in-situ detection of the dendrite growth inside the battery, providing early warning for battery safety hazards caused by dendrite growth, and improving the safety of the battery. In addition, it can also detect the power, temperature and pressure information inside the battery at the same time. It has the characteristics of anti-electromagnetic interference, no charge, low transmission loss, and multi-point multiplexing. Real-time, remote, multi-parameter, networked in-situ monitoring of batteries.

Description

technical field [0001] The invention relates to a battery detection system, in particular to a battery optical fiber in-situ detection system and method, belonging to the field of optical fiber sensing and battery management. Background technique [0002] Lithium metal has a very high theoretical specific energy (3860mAhg -1 ) and relatively low electrochemical potential (-3.04V), the battery assembled after matching with the corresponding cathode material has the highest theoretical specific energy density. Therefore, metal lithium batteries are also considered to be one of the candidate materials with the most potential to break through the current energy density bottleneck of lithium-ion batteries. But so far, the application of metallic lithium as a negative electrode in secondary battery systems has not been commercialized on a large scale. The main reason is that lithium will dissolve unevenly on the upper surface of the electrode when the lithium metal lithium second...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42
CPCH01M10/4285Y02E60/10H01M10/48G01N21/4133G01N21/553G01N2201/088G01R31/392G01N21/01G01N21/41
Inventor 郭团麦耀华钟海李凯伟
Owner JINAN UNIVERSITY
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