System, method, and computer program product for utilizing a fiber bragg grating to detect a gas indicating the onset of thermal runaway

1 . A system for detecting a gas, the system comprising:

a light source configured to emit light comprising a spectrum of wavelengths; and

a sensing fiber comprising a first end and a second end,

wherein the sensing fiber is positioned to receive the light emitted by the light source at the first end,

wherein the sensing fiber is optically coupled to a photodiode at the second end, and

wherein the sensing fiber comprises a filtering mechanism configured to reflect a portion of the spectrum of wavelengths of the light, wherein another portion of the spectrum of wavelengths of the light is received by the photodiode through the sensing fiber;

wherein the gas is detected based on comparing the spectrum of wavelengths of the light received by the photodiode, determined from an electrical output of the photodiode, with a spectral signature of the gas, and wherein detection is based on comparing the spectrum of wavelengths of the light received by the photodiode with a stored spectral signature of the gas, and requires that at least two electrical outputs meet respective threshold conditions indicative of the gas.

2 . The system of claim 1 , wherein the filtering mechanism is a fiber Bragg grating configured to reflect a reflected wavelength of the spectrum of wavelengths.

3 . The system of claim 2 , wherein the sensing fiber comprises a plurality of filtering mechanisms wherein each of the plurality of filtering mechanisms is configured to reflect a different portion of the spectrum of wavelengths.

4 . The system of claim 1 , further comprising a plurality of sensing fibers each sensing fiber optically coupled to a receiving photodiode, wherein the filtering mechanism of each of the plurality of sensing fibers is configured to reflect a different portion of the spectrum of wavelengths.

5 . The system of claim 4 , wherein the gas impedes a transmittance of the light within the transmitted spectrum of wavelengths according to a spectral signature, and wherein the plurality of sensing fibers are configured to identify the gas according to the spectral signature of the gas.

6 . The system of claim 1 , wherein the light source comprises an array of light emitting diodes.

7 . The system of claim 1 , wherein the spectrum of wavelengths comprises light of wavelengths between 0.75 micrometers and 15 micrometers.

8 . The system of claim 1 , wherein the gas comprises at least one of ethylene carbonate, diethyl carbonate, dimethyl carbonate, and ethyl methyl carbonate.

9 . The system of claim 1 , further comprising a battery cell, wherein the light source and sensing fiber are positioned proximate the battery cell.

10 . The system of claim 9 , wherein detecting the gas is an indicator of a first venting previous to an onset of thermal runaway in the battery cell.

11 . The system of claim 1 , further comprising a processor electrically connected to the light source and the photodiode, wherein the processor is configured to determine a presence of the gas based on an electrical output of the photodiode.

12 . The system of claim 11 , wherein the processor utilizes machine learning techniques to detect the gas based on the output of the photodiode.

13 . The system of claim 11 , wherein the processor further receives physical environment information from one or more sensing devices and alters at least one detection parameter based on the physical environment information.

14 . A method for detecting thermal runaway in a battery cell, the method comprising:

causing a light source to emit light comprising a transmitted spectrum of wavelengths;

receiving, from a photodiode optically coupled to a sensing fiber, an electrical output corresponding to an intensity of light received at the photodiode,

wherein the sensing fiber comprises a first end and a second end,

wherein the sensing fiber is positioned to receive the light emitted by the light source at the first end,

wherein the sensing fiber is optically coupled to the photodiode at the second end, and

wherein the sensing fiber comprises a filtering mechanism configured to reflect a portion of the transmitted spectrum of wavelengths of the light, wherein another portion of the spectrum of wavelengths of the light is received by the photodiode through the sensing fiber;

identifying a gas based on the electrical output of the photodiode; and

detecting thermal runaway in the battery cell based at least in part on identifying the gas, wherein the gas is detected based on comparing the spectrum of wavelengths of the light received by the photodiode, determined from an electrical output of the photodiode, with a spectral signature of the gas, and wherein detection is based on comparing the spectrum of wavelengths received by the photodiode with a stored spectral signature of the gas, and requires that at least two electrical outputs meet respective threshold conditions indicative of the gas.

15 . The method of claim 14 , further comprising utilizing machine learning techniques to identify the gas based on the electrical output of the photodiode.

16 . The method of claim 14 , further comprising utilizing a plurality of sensing fibers each sensing fiber optically coupled to a receiving photodiode to detect the gas, wherein the filtering mechanism of each of the plurality of sensing fibers is configured to reflect a different portion of the transmitted spectrum of wavelengths.

17 . The method of claim 16 , wherein the gas impedes a transmittance of the light within the transmitted spectrum of wavelengths according to a spectral signature, and wherein the plurality of sensing fibers are configured to identify the gas according to the spectral signature of the gas.

18 . The method of claim 14 , further comprising:

receiving physical environment information from one or more sensing devices; and

altering at least one detection parameter based on the physical environment information.

19 . The method of claim 14 , wherein the transmitted spectrum of wavelengths comprises light of wavelengths between 0.75 micrometers and 15 micrometers.

20 . A computer program product for detecting thermal runaway in a battery cell, the computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising an executable portion configured to:

cause a light source to emit light comprising a transmitted spectrum of wavelengths;

receive, from a photodiode optically coupled to a sensing fiber, an electrical output corresponding to an intensity of light received at the photodiode,

wherein the sensing fiber comprises a first end and a second end,

wherein the sensing fiber is positioned to receive the light emitted by the light source at the first end,

wherein the sensing fiber is optically coupled to the photodiode at the second end, and

wherein the sensing fiber comprises a filtering mechanism configured to reflect a portion of the transmitted spectrum of wavelengths of the light, wherein another portion of the spectrum of wavelengths of the light is received by the photodiode through the sensing fiber;

identify a gas based on the electrical output of the photodiode; and

detect thermal runaway in the battery cell based at least in part on identifying the gas, wherein the gas is detected based on comparing the spectrum of wavelengths of the light received by the photodiode, determined from an electrical output of the photodiode, with a spectral signature of the gas, and wherein detection is based on comparing the spectrum of wavelengths received by the photodiode with a stored spectral signature of the gas, and requires that at least two electrical outputs meet respective threshold conditions indicative of the gas.