CN114689516B - Device and method for monitoring dendrite growth state of lithium battery - Google Patents
Device and method for monitoring dendrite growth state of lithium battery Download PDFInfo
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- CN114689516B CN114689516B CN202210431991.3A CN202210431991A CN114689516B CN 114689516 B CN114689516 B CN 114689516B CN 202210431991 A CN202210431991 A CN 202210431991A CN 114689516 B CN114689516 B CN 114689516B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 71
- 210000001787 dendrite Anatomy 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims description 23
- 238000012544 monitoring process Methods 0.000 title claims description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 108
- 238000001514 detection method Methods 0.000 claims abstract description 72
- 239000000523 sample Substances 0.000 claims abstract description 70
- 230000003287 optical effect Effects 0.000 claims abstract description 45
- 238000012806 monitoring device Methods 0.000 claims abstract description 19
- 230000007613 environmental effect Effects 0.000 claims description 21
- 230000003321 amplification Effects 0.000 claims description 14
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 229910052594 sapphire Inorganic materials 0.000 claims description 3
- 239000010980 sapphire Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 15
- 229910001416 lithium ion Inorganic materials 0.000 description 15
- 238000010586 diagram Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The device comprises an optical fiber coupler connected with a laser diode, a light-emitting detection photodiode and a light circulator through optical fibers, a light-emitting signal amplifying circuit system connected with the light-emitting detection photodiode, a signal processing and demodulating system and a laser diode control circuit system connected with the signal processing and demodulating system and the laser diode, the optical circulator is connected with the optical fiber sensing probe and the return light detection photodiode through optical fibers, the return light signal amplifying circuit system is connected with the return light detection photodiode and the signal processing and demodulating system, the temperature compensation signal amplifying circuit system is connected with the temperature compensation photodiode and the signal processing and demodulating system, the signal processing and demodulating system is connected with the bus, the price of each component in the device is lower and the volume is smaller, and the price of the lithium battery dendrite growth state monitoring device is reduced and is convenient to integrate with the inside of the lithium battery.
Description
Technical Field
The application relates to the field of dendrites of lithium batteries, in particular to a dendrite growth state monitoring device and method of a lithium battery.
Background
The electrolyte is an important component of the lithium battery, wets the anode, the cathode and the diaphragm of the lithium battery, and enables lithium ions to move between the anode and the cathode of the lithium battery, so that the lithium battery realizes normal charge and discharge circulation. The concentration of lithium ions in the electrolyte affects the growth of lithium dendrites of the lithium battery, however, the continuous growth of lithium dendrites can cause the lithium dendrites to puncture the separator of the lithium battery, thereby causing micro-short circuit inside the battery and causing thermal runaway of the lithium battery.
In order to avoid thermal runaway of lithium batteries, monitoring of lithium dendrite growth is required. Since the concentration of lithium ions in the electrolyte affects the growth of lithium dendrites of a lithium battery, the prior art obtains the growth condition of lithium dendrites by measuring the concentration of lithium ions. As shown in fig. 1, in the prior art, the concentration of lithium ions is measured by measuring the spectrum of an inclined grating or an optical fiber evanescent wave, so that the growth condition of lithium dendrites is monitored, namely, the abnormal change of the refractive index of the surface of an optical fiber sensor is caused by the change of the concentration of electrolyte ions, the spectral changes of the optical fields of the inclined grating and the optical fiber evanescent wave are caused by the abnormal change of the refractive index, and the monitoring of the growth state of the dendrites of a battery is realized by recording the spectral information of the sensor in real time through a spectrometer.
However, the spectrum demodulation instrument in the prior art is expensive, which results in the high price of the dendrite growth state monitoring device of the lithium battery in the prior art; and the spectrum demodulation instrument is large in size and inconvenient to integrate in the lithium battery.
Disclosure of Invention
The application provides a device and a method for monitoring the dendrite growth state of a lithium battery, which are used for solving the technical problems that the device and the method for monitoring the dendrite growth state of the lithium battery are high in price and inconvenient to integrate in the lithium battery.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
in a first aspect, the embodiment of the application discloses a lithium battery dendrite growth state monitoring device, which comprises a bus, a signal processing and demodulating system, an electric signal wire, an outgoing light signal amplifying circuit system, a laser diode control circuit system, a return light signal amplifying circuit system, a temperature compensation photodiode, an outgoing light detection photodiode, a return light detection photodiode, a laser diode, an optical fiber coupler, an optical circulator and an optical fiber sensing probe,
The light inlet end of the optical fiber coupler is connected with the laser diode through an optical fiber, one light outlet end of the optical fiber coupler is connected with the light outlet detection photodiode through an optical fiber, the light outlet detection photodiode is connected with the light outlet signal amplification circuit system through an electric signal wire, the light outlet signal amplification circuit system is connected with the signal processing and demodulation system through an electric signal wire, the light outlet signal amplification circuit system is connected with the laser diode control circuit system through an electric signal wire, and the laser diode control circuit system is connected with the signal processing and demodulation system and the laser diode through an electric signal wire;
The other light-emitting end of the optical fiber coupler is connected with an optical circulator through an optical fiber, the optical circulator is connected with an optical fiber sensing probe and a return light detection photodiode through an optical fiber, the return light detection photodiode is connected with a return light signal amplification circuit system through an electric signal wire, and the return light signal amplification circuit system is connected with a signal processing and demodulating system through the electric signal wire;
The temperature compensation photodiode is connected with a temperature compensation signal amplifying circuit system through an electric signal wire, the temperature compensation signal amplifying circuit system is connected with a signal processing and demodulating system through an electric signal wire, and the signal processing and demodulating system is connected with a bus.
Optionally, the device further comprises a metal shell, wherein a signal processing and demodulating system, an electric signal wire, an outgoing light signal amplifying circuit system, a laser diode control circuit system, a return light signal amplifying circuit system, a temperature compensation photodiode, an outgoing light detection photodiode, a return light detection photodiode, a laser diode, an optical fiber coupler and an optical circulator are arranged in the metal shell.
Optionally, the optical fiber sensing probe further comprises a plastic sleeve, wherein the plastic sleeve is arranged outside the optical fiber sensing probe in the circumferential direction.
Optionally, the optical fiber sensing probe comprises an optical fiber section and a probe, and the optical fiber section is connected with the probe.
Optionally, one end of the probe is a cylinder, the other end of the probe is a right-angle cone, and the cylinder end of the probe is bonded or fused with the optical fiber section through optical cement.
Optionally, the probe is any one of a quartz glass probe, a diamond probe, a sapphire probe, and a micromachined fiber probe.
In a second aspect, an embodiment of the application discloses a method for monitoring a dendrite growth state of a lithium battery, which comprises the steps of immersing an optical fiber sensing probe in electrolyte around a negative electrode of the lithium battery, dividing light emitted by a laser diode into first light splitting and second light splitting by an optical fiber coupler, transmitting the first light splitting to the optical fiber sensing probe by an optical fiber circulator and an optical fiber, and transmitting the second light splitting to a light-emitting detection photodiode by the optical fiber;
The method comprises the steps that light reflected by an optical fiber sensing probe is called return light, the return light is transmitted to a return light detection photodiode through an optical fiber and an optical circulator, an optical signal of the return light is converted into an electric signal of the return light by the return light detection photodiode, the electric signal of the return light is amplified into a first amplified electric signal by a return light signal amplifying circuit system, and the first amplified electric signal is transmitted to a signal processing and demodulating system;
The light-emitting detection photodiode detects the light-emitting variation of the second light beam, converts the light signal of the light-emitting variation into an electric signal of the light-emitting variation, and the light-emitting signal amplifying circuit system amplifies the electric signal of the light-emitting variation into a second amplified electric signal and transmits the second amplified electric signal to the signal processing and demodulating system;
the temperature compensation photodiode converts an optical signal influenced by the environment into an electric signal influenced by the environment, the temperature compensation signal amplifying circuit system amplifies the electric signal influenced by the environment into a third amplified electric signal, and the third amplified electric signal is transmitted to the signal processing and demodulating system;
The signal processing and demodulating system performs signal processing and demodulation on the first amplified electric signal, the second amplified electric signal and the third amplified electric signal, and uploads the first amplified electric signal, the second amplified electric signal and the third amplified electric signal after signal processing and demodulation through a bus;
the signal processing and demodulating system transmits the third amplified electric signal after signal processing and demodulation to the laser diode control circuit system, the light-emitting signal amplifying circuit system transmits the second amplified electric signal to the laser diode control circuit system, and the laser diode control circuit system adjusts the output light power of the laser diode according to the second amplified electric signal and the third amplified electric signal after signal processing and demodulation.
Optionally, the light-emitting signal amplifying circuit system amplifies the electrical signal of the light-emitting variation into a second amplified electrical signal, including:
The second amplified electrical signal is used as a reference signal for a signal processing and demodulation system, and the second amplified electrical signal is used as a feedback signal for a laser diode control circuitry.
Optionally, before adjusting the output optical power of the laser diode according to the second amplified electrical signal and the third amplified electrical signal after signal processing and demodulation, the laser diode control circuitry includes:
the bus sets the initial output optical power of the laser diode by the laser diode control circuitry.
The beneficial effects of the application are as follows:
The embodiment of the application provides a device and a method for monitoring the dendrite growth state of a lithium battery, wherein an optical fiber coupler divides light emitted by a laser diode into two parts, one part of the light is transmitted to an optical fiber sensing probe through an optical fiber and an optical circulator, and an electric signal of return light reflected by the optical fiber sensing probe is detected and amplified through a return light detection photodiode and a return light signal amplifying circuit system and is transmitted to a signal processing and demodulating system; the other part of light is transmitted to the light-emitting detection photodiode through the optical fiber, and the electric signal of the light-emitting variation is detected and amplified through the light-emitting detection photodiode and the light-emitting signal amplifying circuit system and transmitted to the signal processing and demodulating system; the electric signals influenced by the environment are detected and amplified through the temperature compensating photodiode and the temperature compensating signal amplifying circuit system and are transmitted to the signal processing and demodulating system.
The signal processing and demodulating system receives three electric signals simultaneously, processes and demodulates the three electric signals and then uploads the processed and demodulated electric signals to the bus, wherein the electric signals with the light-emitting variable quantity are uploaded to the bus after being processed and demodulated, so that the electric signal error caused by the fluctuation of the output light power of the laser diode is reduced, and further the lithium ion concentration error and the lithium battery dendrite growth state error caused by the electric signal error are reduced; the electrical signal of the environmental influence is processed and demodulated and then uploaded to the bus, so that the electrical signal error caused by the influence of the environmental factors on the dark current of the return light detection photodiode and the dark current of the light emitting detection photodiode is reduced, the lithium ion concentration error and the dendrite growth state error of the lithium battery after demodulation caused by the electrical signal error are further reduced, and the accuracy of dendrite growth state detection of the lithium battery is improved.
The prices of the signal processing and demodulating system, the electric signal lead, the light-emitting signal amplifying circuit system, the laser diode control circuit system, the light-returning signal amplifying circuit system, the temperature compensation photodiode, the light-emitting detection photodiode, the light-returning detection photodiode, the laser diode, the optical fiber coupler, the optical circulator and the optical fiber sensing probe are all lower, and the volumes are all smaller, so that the price of the lithium battery dendrite growth state monitoring device and method is reduced, and the lithium battery dendrite growth state monitoring device and method are convenient to integrate in a lithium battery.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a dendrite growth state monitoring device for a lithium battery in the prior art;
fig. 2 is a schematic structural diagram of a dendrite growth state monitoring device for a lithium battery according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for monitoring dendrite growth status of a lithium battery according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an optical fiber sensing probe according to an embodiment of the present application;
Wherein:
The optical fiber sensor comprises a 1-bus, a 2-metal shell, a 3-signal processing and demodulation system, a 4-electric signal wire, a 5-light emitting signal amplifying circuit system, a 6-laser diode control circuit system, a 7-return light signal amplifying circuit system, an 8-temperature compensation signal amplifying circuit system, a 9-temperature compensation photodiode, a 10-light emitting detection photodiode, a 11-return light detection photodiode, a 12-laser diode, a 13-optical fiber, a 14-optical fiber coupler, a 15-optical circulator, a 16-plastic sleeve, a 17-optical fiber sensing probe, a 18-optical fiber section and a 19-probe.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
Referring to fig. 2, the embodiment of the application provides a dendrite growth state monitoring device of a lithium battery, which comprises a bus 1, a signal processing and demodulating system 3, an electric signal wire 4, an outgoing light signal amplifying circuit system 5, a laser diode control circuit system 6, a return light signal amplifying circuit system 7, a temperature compensation signal amplifying circuit system 8, a temperature compensation photodiode 9, an outgoing light detecting photodiode 10, a return light detecting photodiode 11, a laser diode 12, an optical fiber 13, an optical fiber coupler 14, an optical circulator 15 and an optical fiber sensing probe 17, wherein the light inlet end of the optical fiber coupler 14 is connected with the laser diode 12 through the optical fiber 13, one light outlet end of the optical fiber coupler 14 is connected with the outgoing light detecting photodiode 10 through the optical fiber 13, the outgoing light detecting photodiode 10 is connected with the outgoing light signal amplifying circuit system 5 through the electric signal wire 4, the outgoing light signal amplifying circuit system 5 is connected with the signal processing and demodulating system 3 through the electric signal wire 4, the outgoing light signal amplifying circuit system 5 is connected with the laser diode control circuit system 6 through the electric signal wire 4, and the laser diode control circuit system 6 is connected with the signal processing and demodulating system 3 through the optical signal wire 4.
The laser diode 12 is optionally but not limited to an infrared laser diode and an ultraviolet laser diode. The optical fiber coupler 14 transmits a part of light of the laser diode 12 to the light-emitting detection photodiode 10 through the optical fiber 13, converts an optical signal of a light-emitting variation of a part of light of the laser diode 12 into an electrical signal of a light-emitting variation of a part of light of the laser diode 12 through the light-emitting detection photodiode 10, amplifies the electrical signal of the light-emitting variation of a part of light of the laser diode 12 through the light-emitting signal amplifying circuit system 5, and transmits the electrical signal to the signal processing and demodulating system 3, thereby reducing the influence of fluctuation of the output light power of the laser diode 12 caused by environmental factors on the demodulation result of the signal processing and demodulating system 3, further reducing the demodulated lithium ion concentration error and the lithium battery dendrite growth state error caused by the demodulation result error, and improving the accuracy of detecting the dendrite growth state of the lithium battery.
The other light-emitting end of the optical fiber coupler 14 is connected with an optical circulator 15 through an optical fiber 13, the optical circulator 15 is connected with an optical fiber sensing probe 17 and a return light detection photodiode 11 through the optical fiber 13, the return light detection photodiode 11 is connected with a return light signal amplifying circuit system 7 through an electric signal wire 4, and the return light signal amplifying circuit system 7 is connected with a signal processing and demodulating system 3 through the electric signal wire 4.
The optical fiber sensing probe 17 is placed on a battery negative electrode with electrolyte, the optical fiber coupler 14 transmits the other part of light of the laser diode 12 to the optical fiber sensing probe 17 through the optical fiber 13 and the optical circulator 15, the return light is reflected to the return light detection photodiode 11 through the optical fiber sensing probe 17, according to different lithium ion concentrations in the electrolyte, the return light intensity of the optical fiber sensing probe 17 is different, the return light detection photodiode 11 converts the light signal of the return light intensity into the electric signal of the return light intensity, the electric signal of the return light intensity is amplified through the return light signal amplifying circuit system 7 and transmitted to the signal processing and demodulating system 3, the lithium ion concentration in the electrolyte is indirectly obtained through the electric signal of the return light intensity, and then the monitoring of the dendrite growth state of the lithium battery is realized.
In some embodiments, the device for monitoring the dendrite growth state of the lithium battery provided by the embodiment of the application further comprises a plastic sleeve 16, wherein the plastic sleeve 16 is arranged outside the circumferential direction of the optical fiber sensing probe 17, and the plastic sleeve 16 improves the corrosion resistance of the optical fiber sensing probe 17, so that the stability of the device for monitoring the dendrite growth state of the lithium battery provided by the embodiment of the application is improved.
In some embodiments, referring to fig. 4, the fiber optic sensing probe 17 includes a fiber optic segment 18 and a probe 19, with the fiber optic segment 18 being connected to the probe 19.
In some embodiments, as shown in fig. 4, the probe 19 is an integrated optical fiber sensing probe, one end of the probe 19 is a cylinder, the other end of the probe 19 is a right-angle cone, and the cylindrical end of the probe 19 and the optical fiber section 18 are bonded or fusion connected through optical glue.
In some embodiments, probe 19 is any one of a quartz glass probe, a diamond probe, a sapphire probe, and a micromachined fiber optic probe. The probe 19 may be selected from other materials having good light transmittance.
The temperature compensation photodiode 9 is connected with the temperature compensation signal amplifying circuit system 8 through the electric signal wire 4, the temperature compensation signal amplifying circuit system 8 is connected with the signal processing and demodulating system 3 through the electric signal wire 4, and the signal processing and demodulating system 3 is connected with the bus 1.
The photodiodes with the same parameters as the return light detection photodiode 11 and the light emitting detection photodiode 10 are used as the temperature compensation photodiodes 9, the light signals of the environmental influences generated by the environmental factors are converted into the electric signals of the environmental influences through the temperature compensation photodiodes 9, the electric signals of the environmental influences are amplified through the temperature compensation signal amplifying circuit system 8 and transmitted to the signal processing and demodulating system 3, the electric signals of the environmental influences are processed and demodulated and then uploaded to the bus, the electric signal errors caused by the influence of the environmental factors on the dark currents of the return light detection photodiode 11 and the light emitting detection photodiode 10, especially the electric signal errors caused by the influence of the temperature on the dark currents of the return light detection photodiode 11 and the light emitting detection photodiode 10 are reduced, further the lithium ion concentration errors after demodulation and the lithium battery dendrite growth state errors caused by the electric signal errors are reduced, and the accuracy and the stability of lithium battery dendrite growth state detection are improved.
In some embodiments, further comprises a metal housing 2, the metal shell 2 is internally provided with a signal processing and demodulating system 3, an electric signal wire 4, an outgoing light signal amplifying circuit system 5, a laser diode control circuit system 6, a return light signal amplifying circuit system 7, a temperature compensation signal amplifying circuit system 8, a temperature compensation photodiode 9, an outgoing light detection photodiode 10, a return light detection photodiode 11, a laser diode 12, an optical fiber 13, an optical fiber coupler 14 and an optical circulator 15.
When the lithium battery dendrite growth state monitoring device provided by the embodiment of the application is integrally integrated in a battery, the plastic shell can be arranged in the circumferential direction of the metal shell 2, so that the corrosion resistance is improved, and the stability of the lithium battery dendrite growth state monitoring device provided by the embodiment of the application is further improved.
The signal processing and demodulating system 3 transmits the electrical signal of the environmental influence after signal processing and demodulation to the laser diode control circuit system 6, the light-emitting signal amplifying circuit system 5 transmits the electrical signal of the light-emitting variation of a part of light of the laser diode 12 to the laser diode control circuit system 6, and the influence of fluctuation of the light-emitting detection photodiode 11, the light-emitting detection photodiode 10 and the temperature compensation photodiode 9 on the demodulation result is eliminated through a reasonable algorithm by the feedback control of the light-emitting detection photodiode 10, the light-emitting signal amplifying circuit system 5 and the laser diode control circuit system 6, namely, the electrical signal of the light-emitting variation obtained through the light-emitting detection photodiode 10 and the light-emitting signal amplifying circuit system 5 and the electrical signal of the environmental influence obtained through the temperature compensation signal amplifying circuit system 8, and the output light power of the laser diode 12 is regulated.
The laser diode 12 maintains the constant output of the optical power of the laser diode 12 by compensating the optical power feedback to the laser diode control circuitry 6, that is, the laser diode control circuitry 6 adjusts the output optical power of the laser diode 12 according to the electrical signal of the output optical variation, so that the variation of the output optical power of the laser diode 12 is stabilized within one thousandth.
Referring to fig. 3, the present application further provides an embodiment of a dendrite growth status monitoring method for a lithium battery, corresponding to the foregoing embodiment of a dendrite growth status monitoring device for a lithium battery. This embodiment comprises the steps of:
step S110: the optical fiber sensing probe is soaked in electrolyte around a negative electrode of the lithium battery, the optical fiber coupler divides light emitted by the laser diode into first light splitting and second light splitting, the optical circulator and the optical fiber transmit the first light splitting to the optical fiber sensing probe, and the optical fiber transmits the second light splitting to the light emitting detection photodiode.
Step S120: the light reflected by the optical fiber sensing probe is called return light, the return light is transmitted to the return light detection photodiode through the optical fiber and the optical circulator, the return light detection photodiode converts an optical signal of the return light into an electric signal of the return light, the return light signal amplifying circuit system amplifies the electric signal of the return light into a first amplified electric signal, and the first amplified electric signal is transmitted to the signal processing and demodulating system.
Step S130: the light-emitting detection photodiode detects the light-emitting variation of the second light beam, converts the light signal of the light-emitting variation into an electric signal of the light-emitting variation, and the light-emitting signal amplifying circuit system amplifies the electric signal of the light-emitting variation into a second amplified electric signal and transmits the second amplified electric signal to the signal processing and demodulating system.
In some embodiments, the second amplified electrical signal is used as a reference signal for a signal processing and demodulation system and the second amplified electrical signal is used as a feedback signal for laser diode control circuitry.
Step S140: the temperature compensation photodiode converts an optical signal of an environmental influence into an electrical signal of the environmental influence, and the temperature compensation signal amplifying circuit system amplifies the electrical signal of the environmental influence into a third amplified electrical signal and transmits the third amplified electrical signal to the signal processing and demodulating system.
Step S150: the signal processing and demodulating system performs signal processing and demodulation on the first amplified electric signal, the second amplified electric signal and the third amplified electric signal, and uploads the first amplified electric signal, the second amplified electric signal and the third amplified electric signal after signal processing and demodulation through a bus.
Step S160: the signal processing and demodulating system transmits the third amplified electric signal after signal processing and demodulation to the laser diode control circuit system, the light-emitting signal amplifying circuit system transmits the second amplified electric signal to the laser diode control circuit system, and the laser diode control circuit system adjusts the output light power of the laser diode according to the second amplified electric signal and the third amplified electric signal after signal processing and demodulation.
In some embodiments, the laser diode control circuitry sets an initial output optical power of the laser diode by the laser diode control circuitry before adjusting the output optical power of the laser diode based on the second amplified electrical signal and the signal processed and demodulated third amplified electrical signal.
The signal processing and demodulating system receives three electric signals simultaneously, processes and demodulates the three electric signals and then uploads the processed and demodulated electric signals to the bus, wherein the electric signals with the light-emitting variable quantity are uploaded to the bus after being processed and demodulated, so that the electric signal error caused by the fluctuation of the output light power of the laser diode is reduced, and further the lithium ion concentration error and the lithium battery dendrite growth state error caused by the electric signal error are reduced; the electrical signal of the environmental influence is processed and demodulated and then uploaded to the bus, so that the electrical signal error caused by the influence of the environmental factors on the dark current of the return light detection photodiode and the dark current of the light emitting detection photodiode is reduced, the lithium ion concentration error and the dendrite growth state error of the lithium battery after demodulation caused by the electrical signal error are further reduced, and the accuracy of dendrite growth state detection of the lithium battery is improved.
As can be seen from the above embodiments, according to the device and method for monitoring dendrite growth state of a lithium battery provided by the embodiments of the present application, the optical fiber coupler divides light emitted by the laser diode into two parts, and one part of the light is transmitted to the optical fiber sensing probe through the optical fiber and the optical circulator, and an electrical signal of return light reflected by the optical fiber sensing probe is detected and amplified through the return light detection photodiode and the return light signal amplifying circuit system, and is transmitted to the signal processing and demodulating system; the other part of light is transmitted to the light-emitting detection photodiode through the optical fiber, and the electric signal of the light-emitting variation is detected and amplified through the light-emitting detection photodiode and the light-emitting signal amplifying circuit system and transmitted to the signal processing and demodulating system; the electric signals influenced by the environment are detected and amplified through the temperature compensating photodiode and the temperature compensating signal amplifying circuit system and are transmitted to the signal processing and demodulating system.
The signal processing and demodulating system receives three electric signals simultaneously, processes and demodulates the three electric signals and then uploads the processed and demodulated electric signals to the bus, wherein the electric signals with the light-emitting variable quantity are uploaded to the bus after being processed and demodulated, so that the electric signal error caused by the fluctuation of the output light power of the laser diode is reduced, and further the lithium ion concentration error and the lithium battery dendrite growth state error caused by the electric signal error are reduced; the electrical signal of the environmental influence is processed and demodulated and then uploaded to the bus, so that the electrical signal error caused by the influence of the environmental factors on the dark current of the return light detection photodiode and the dark current of the light emitting detection photodiode is reduced, the lithium ion concentration error and the dendrite growth state error of the lithium battery after demodulation caused by the electrical signal error are further reduced, and the accuracy of dendrite growth state detection of the lithium battery is improved.
The prices of the signal processing and demodulating system, the electric signal lead, the light-emitting signal amplifying circuit system, the laser diode control circuit system, the light-returning signal amplifying circuit system, the temperature compensation photodiode, the light-emitting detection photodiode, the light-returning detection photodiode, the laser diode, the optical fiber coupler, the optical circulator and the optical fiber sensing probe are all lower, and the volumes are all smaller, so that the price of the lithium battery dendrite growth state monitoring device and method is reduced, and the lithium battery dendrite growth state monitoring device and method are convenient to integrate in a lithium battery.
Since the foregoing embodiments are all described in other modes by reference to the above, the same parts are provided between different embodiments, and the same and similar parts are provided between the embodiments in the present specification. And will not be described in detail herein.
It should be noted that in this specification, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the statement "comprises one … …" does not exclude that an additional identical element is present in a circuit structure, article or device comprising the element.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the application herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The embodiments of the present application described above do not limit the scope of the present application.
Claims (9)
1. A lithium battery dendrite growth state monitoring device, comprising: a bus (1), a signal processing and demodulation system (3), an electric signal wire (4), an outgoing light signal amplifying circuit system (5), a laser diode control circuit system (6), a return light signal amplifying circuit system (7), a temperature compensation signal amplifying circuit system (8), a temperature compensation photodiode (9), an outgoing light detection photodiode (10), a return light detection photodiode (11), a laser diode (12), an optical fiber (13), an optical fiber coupler (14), an optical circulator (15) and an optical fiber sensing probe (17),
The light inlet end of the optical fiber coupler (14) is connected with the laser diode (12) through the optical fiber (13), one light outlet end of the optical fiber coupler (14) is connected with the light outlet detection photodiode (10) through the optical fiber (13), the light outlet detection photodiode (10) is connected with the light outlet signal amplification circuit system (5) through the electric signal wire (4), the light outlet signal amplification circuit system (5) is connected with the signal processing and demodulation system (3) through the electric signal wire (4), the light outlet signal amplification circuit system (5) is connected with the laser diode control circuit system (6) through the electric signal wire (4), and the laser diode control circuit system (6) is connected with the signal processing and demodulation system (3) and the laser diode (12) through the electric signal wire (4);
The other light emitting end of the optical fiber coupler (14) is connected with the optical circulator (15) through the optical fiber (13), the optical circulator (15) is connected with the optical fiber sensing probe (17) and the return light detection photodiode (11) through the optical fiber (13), the return light detection photodiode (11) is connected with the return light signal amplifying circuit system (7) through the electric signal wire (4), and the return light signal amplifying circuit system (7) is connected with the signal processing and demodulating system (3) through the electric signal wire (4);
The temperature compensation photodiode (9) is connected with the temperature compensation signal amplification circuit system (8) through the electric signal wire (4), the temperature compensation signal amplification circuit system (8) is connected with the signal processing and demodulation system (3) through the electric signal wire (4), and the signal processing and demodulation system (3) is connected with the bus (1).
2. The lithium battery dendrite growth state monitoring device according to claim 1, further comprising a metal housing (2), wherein the metal housing (2) is internally provided with the signal processing and demodulation system (3), the electrical signal wire (4), the light-emitting signal amplification circuitry (5), the laser diode control circuitry (6), the return light signal amplification circuitry (7), the temperature compensation signal amplification circuitry (8), the temperature compensation photodiode (9), the light-emitting detection photodiode (10), the return light detection photodiode (11), the laser diode (12), the optical fiber (13), the optical fiber coupler (14) and the optical circulator (15).
3. The lithium battery dendrite growth state monitoring device according to claim 1, further comprising a plastic sleeve (16), wherein the plastic sleeve (16) is provided outside the circumferential direction of the optical fiber sensing probe (17).
4. The lithium battery dendrite growth state monitoring device according to claim 1, characterized in that the optical fiber sensing probe (17) comprises an optical fiber section (18) and a probe (19), the optical fiber section (18) being connected with the probe (19).
5. The device for monitoring the dendrite growth state of the lithium battery according to claim 4, wherein one end of the probe (19) is a cylinder, the other end of the probe (19) is a right-angle cone, and the cylindrical end of the probe (19) is bonded or fusion-connected with the optical fiber section (18) through optical cement.
6. The lithium battery dendrite growth state monitoring device of claim 5, wherein the probe (19) is any one of a quartz glass probe, a diamond probe, a sapphire probe, and a micromachined fiber optic probe.
7. A method for monitoring dendrite growth state of a lithium battery, comprising:
The method comprises the steps that an optical fiber sensing probe is soaked in electrolyte around a negative electrode of a lithium battery, a fiber coupler divides light emitted by a laser diode into first light splitting and second light splitting, a light circulator and an optical fiber transmit the first light splitting to the optical fiber sensing probe, and the optical fiber transmits the second light splitting to a light emitting detection photodiode;
the method comprises the steps that light reflected by an optical fiber sensing probe is called return light, the return light is transmitted to a return light detection photodiode through an optical fiber and an optical circulator, an optical signal of the return light is converted into an electric signal of the return light by the return light detection photodiode, the electric signal of the return light is amplified into a first amplified electric signal by a return light signal amplifying circuit system, and the first amplified electric signal is transmitted to a signal processing and demodulating system;
the light-emitting detection photodiode detects the light-emitting variation of the second light beam, converts the light signal of the light-emitting variation into an electric signal of the light-emitting variation, and the light-emitting signal amplifying circuit system amplifies the electric signal of the light-emitting variation into a second amplified electric signal and transmits the second amplified electric signal to the signal processing and demodulating system;
The temperature compensation photodiode converts an optical signal with environmental influence into an electrical signal with environmental influence, the temperature compensation signal amplifying circuit system amplifies the electrical signal with environmental influence into a third amplified electrical signal, and the third amplified electrical signal is transmitted to the signal processing and demodulating system;
the signal processing and demodulating system performs signal processing and demodulation on the first amplified electric signal, the second amplified electric signal and the third amplified electric signal, and uploads the first amplified electric signal, the second amplified electric signal and the third amplified electric signal after signal processing and demodulation through a bus;
The signal processing and demodulating system transmits the third amplified electric signal after signal processing and demodulation to the laser diode control circuit system, the light-emitting signal amplifying circuit system transmits the second amplified electric signal to the laser diode control circuit system, and the laser diode control circuit system adjusts the output light power of the laser diode according to the second amplified electric signal and the third amplified electric signal after signal processing and demodulation.
8. The method of claim 7, wherein the light-out signal amplification circuitry amplifies the electrical signal of the light-out variation to a second amplified electrical signal, comprising:
And taking the second amplified electric signal as a reference signal of the signal processing and demodulating system, and taking the second amplified electric signal as a feedback signal of the laser diode control circuit system.
9. The method of claim 7, wherein the laser diode control circuitry adjusts the output optical power of the laser diode based on the second amplified electrical signal and the third amplified electrical signal after signal processing and demodulation, comprising:
The bus sets an initial output optical power of the laser diode through the laser diode control circuitry.
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| CN105258745A (en) * | 2015-11-09 | 2016-01-20 | 山东省科学院激光研究所 | Downhole optical fiber distributed flow monitoring system |
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| 新能源汽车动力电池锂沉积现象研究;戴文旭 等;《上海汽车》;20200131;第2-9页 * |
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