CN112097971A - Optical fiber sensor-based lithium dendrite in-situ detection method and system - Google Patents
Optical fiber sensor-based lithium dendrite in-situ detection method and system Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 187
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 158
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 210000001787 dendrite Anatomy 0.000 title claims abstract description 46
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 46
- 239000002985 plastic film Substances 0.000 claims abstract description 53
- 229920006255 plastic film Polymers 0.000 claims abstract description 53
- 230000009471 action Effects 0.000 claims abstract description 25
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000007769 metal material Substances 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 238000000840 electrochemical analysis Methods 0.000 claims abstract description 11
- 239000003792 electrolyte Substances 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 16
- 238000011056 performance test Methods 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- General Physics & Mathematics (AREA)
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Abstract
The invention relates to the technical field of lithium batteries, and particularly discloses a lithium dendrite in-situ detection method based on an optical fiber sensor, wherein the method comprises the following steps: evaporating a metal material which is the same as that of a pole piece to be detected on the surface of the first optical fiber sensor, and sleeving a protective sleeve on the surface of the second optical fiber sensor; the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate through the aluminum plastic film on the lithium battery and extend out of the aluminum plastic film to be connected with a demodulation system; injecting an electrolyte into the aluminum-plastic film; respectively acquiring detection signals of a first optical fiber sensor and a second optical fiber sensor through a demodulation system, and acquiring a lithium metal stress action signal; and analyzing the lithium metal growth state in the lithium battery according to the measured electrochemical test signal and the lithium metal stress action signal of the lithium battery. The invention also discloses a lithium dendrite in-situ detection system based on the optical fiber sensor. The method for detecting the lithium dendrite in situ based on the optical fiber sensor can realize the in situ detection of the lithium dendrite.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium dendrite in-situ detection method based on an optical fiber sensor and a lithium dendrite in-situ detection system based on the optical fiber sensor.
Background
Under the existing energy framework, the foreseeable exhaustion of petrochemical energy and the environmental protection theme of the modern society are in conflict with each other increasingly. The demand of replacing petrochemical energy drive with pure electric drive under various scenes is increasingly obvious. The discovery of lithium iron phosphate and ternary materials enables a lithium ion battery to be used as the most widely applied energy storage device in the century. However, with decades of development, the increasing speed of the energy density of lithium ion batteries has been significantly slowed down and gradually approaches the theoretical limit. Lithium metal batteries (such as lithium sulfur batteries) and novel non-negative electrode batteries are one of the most promising next-generation high energy density storage devices, and can meet the requirements of emerging industries. However, problems of volume expansion, SEI cracking, and "dead lithium" caused by non-uniform lithium metal deposition are the first problems limiting their large-scale application.
Researchers have employed various means to characterize and detect the deposition behavior of lithium metal, such as scanning electron microscopy, cryoelectron microscopy, and the like. However, these techniques have problems: (1) for a common commercial battery system, in-situ detection cannot be performed; (2) in-situ detection can be realized only by adopting a method for constructing a simulation battery (such as a nut battery), and the real behavior of lithium growth in a battery configuration with real application value cannot be reflected.
Disclosure of Invention
The invention provides an optical fiber sensor-based lithium dendrite in-situ detection method and an optical fiber sensor-based lithium dendrite in-situ detection system, which solve the problem that lithium dendrite in-situ detection cannot be carried out in the related technology.
The invention provides a lithium dendrite in-situ detection method based on a fiber sensor, which comprises the following steps:
evaporating a metal material which is the same as that of a pole piece to be detected on the surface of a first optical fiber sensor, sleeving a protective sleeve on the surface of a second optical fiber sensor, and connecting one end of each of the first optical fiber sensor and the second optical fiber sensor with a broadband light source;
the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate through an aluminum-plastic film on a lithium battery and extend out of the aluminum-plastic film to be connected with a demodulation system, wherein the lithium battery is connected with a battery performance testing system;
sealing the aluminum-plastic film, and injecting electrolyte into the aluminum-plastic film;
respectively acquiring detection signals of the first optical fiber sensor and the second optical fiber sensor through the demodulation system, and acquiring a lithium metal stress action signal in a lithium battery;
and analyzing the lithium metal growth state in the lithium battery according to the electrochemical test signal of the lithium battery measured by the battery performance test system and the lithium metal stress action signal.
Further, the other ends of the first optical fiber sensor and the second optical fiber sensor pass through an aluminum-plastic film on a lithium battery together and extend out of the aluminum-plastic film, wherein the lithium battery is connected with a battery performance testing system, and the system comprises:
and sequentially penetrating the other ends of the first optical fiber sensor and the second optical fiber sensor through aluminum plastic films on a plurality of lithium batteries and finally connecting the other ends of the first optical fiber sensor and the second optical fiber sensor with a demodulation system, wherein the plurality of lithium batteries are connected in series or in parallel and then are connected with a battery performance test system.
Further, the step of enabling the other ends of the first optical fiber sensor and the second optical fiber sensor to jointly penetrate through the aluminum plastic film on the lithium battery and extend out of the aluminum plastic film comprises the following steps:
and after the other ends of the first optical fiber sensor and the second optical fiber sensor are both arranged in the protective sleeve, the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate into an aluminum-plastic film on the lithium battery and extend out of the aluminum-plastic film.
Further, the obtaining, by the demodulation system, detection signals of the first optical fiber sensor and the second optical fiber sensor, respectively, and obtaining a lithium metal stress action signal in a lithium battery includes:
the demodulation system demodulates and analyzes the acquired first optical fiber sensor to obtain a first demodulation signal, the demodulation system demodulates and analyzes the acquired second optical fiber sensor to obtain a second demodulation signal, the first demodulation signal comprises a lithium metal stress action signal and a temperature interference signal of a lithium battery, and the second demodulation signal comprises a temperature interference signal;
and subtracting the second demodulation signal from the first demodulation signal to obtain a lithium metal stress action signal in the lithium battery.
Further, the metal material the same as the pole piece to be detected comprises any one of copper, gold and silver.
As another aspect of the present invention, there is provided a system for in-situ detection of lithium dendrite based on a fiber optic sensor, comprising: the detection device comprises a first optical fiber sensor, a second optical fiber sensor, a broadband light source, a lithium battery, a demodulation system and a battery test system, wherein a metal material which is the same as that of a pole piece to be detected is evaporated on the surface of the first optical fiber sensor, a protective sleeve is sleeved on the surface of the second optical fiber sensor, one end of the first optical fiber sensor and one end of the second optical fiber sensor are both connected with the broadband light source, the other end of the first optical fiber sensor and the other end of the second optical fiber sensor penetrate through an aluminum-plastic film on the lithium battery and extend out of the aluminum-plastic film to be connected with the demodulation system, and the battery test system is connected with the lithium battery;
the demodulation system can acquire detection signals of the first optical fiber sensor and the second optical fiber sensor and obtain a lithium metal stress action signal in the lithium battery, and the battery performance test system can measure an electrochemical test signal of the lithium battery.
Further, optical fiber sensor-based lithium dendrite in-situ detection system includes a plurality of lithium batteries, the other end of first optical fiber sensor with the other end of second optical fiber sensor passes a plurality ofly in proper order together aluminium-plastic film on the lithium battery and finally be connected with demodulation system, and a plurality of lithium batteries after series connection or parallel connection with battery capability test system connects.
Further, the system for in-situ detection of lithium dendrites based on the optical fiber sensor further comprises: and the protective sleeve is sleeved at the other ends of the first optical fiber sensor and the second optical fiber sensor and used for fixing the other ends of the first optical fiber sensor and the second optical fiber sensor together.
Further, the metal material the same as the pole piece to be detected comprises any one of copper, gold and silver.
According to the lithium dendrite in-situ detection method based on the optical fiber sensors, the surface state of the pole piece to be detected is monitored through the two optical fiber sensors, the growth condition of the lithium dendrite on the surface of the electrode can be monitored in situ on the basis of keeping the configuration of a commercial battery, and meanwhile, the growth condition of the lithium dendrite is compared with an electrochemical test signal. The method has the advantages that the battery can be operated in a conventional form, meanwhile, nondestructive monitoring is carried out, the stress change of the surface of the electrode is read, basic scientific problem research can be carried out, and failure early warning can be carried out. In addition, due to the adoption of the two optical fiber sensors, signals of the optical fibers can be compared through temperature sensitive response, signals of the stress sensitive response main optical fibers are decoupled, signals of stress main action are extracted, and the accuracy of the signals is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a lithium dendrite in-situ detection method based on an optical fiber sensor according to the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of a lithium dendrite in-situ detection system based on a fiber sensor according to the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the lithium dendrite in-situ detection system based on the optical fiber sensor provided by the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a method for in-situ detection of lithium dendrite based on an optical fiber sensor is provided, fig. 1 is a flowchart of the method for in-situ detection of lithium dendrite based on an optical fiber sensor according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a system for in-situ detection of lithium dendrite based on an optical fiber sensor according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, including:
s110, evaporating a metal material which is the same as that of a pole piece to be detected on the surface of a first optical fiber sensor, sleeving a protective sleeve on the surface of a second optical fiber sensor, wherein one end of each of the first optical fiber sensor and the second optical fiber sensor is connected with a broadband light source 14;
it should be noted that the protective sleeve is sleeved on the surface of the second optical fiber sensor, so that the second optical fiber sensor can be prevented from responding to the stress of the lithium ion battery, and therefore the second optical fiber sensor only responds to the temperature, and thus the surface of the first optical fiber sensor is evaporated with a metal material the same as that of the pole piece to be detected, so as to ensure the proceeding of the electrodeposition action and realize the response to the stress of the lithium metal.
S120, enabling the other ends of the first optical fiber sensor and the second optical fiber sensor to penetrate through an aluminum-plastic film 11 on a lithium battery together and extend out of the aluminum-plastic film 11 to be connected with a demodulation system 15, wherein the lithium battery is connected with a battery performance testing system 16;
as shown in fig. 2, the other ends of the first optical fiber sensor and the second optical fiber sensor are combined together and then pass through the micropores 12 of the aluminum-plastic film 11 on the lithium battery, then enter the lithium battery, then approach the electrode plate to be detected, and penetrate out of the aluminum-plastic film to be connected with the demodulation system, and meanwhile, two tabs of the lithium battery are both connected to the battery performance testing system.
It should be noted that the aluminum-plastic film 11 is a casing for covering a battery (including but not limited to a pouch battery and a cylindrical battery), a micropore 12 is formed in the surface of the casing, and two optical fiber sensors can penetrate into the micropore 12.
S130, sealing the aluminum-plastic film 11, and injecting an electrolyte into the aluminum-plastic film 11;
it should be noted that the sealing may be performed using a sealing, which may include, but is not limited to, epoxy, and a terminating tape for a battery.
It should be understood that after the electrolyte is injected into the aluminum plastic film, the lithium battery can enter a working state under the action of a battery performance testing system, so that the electrochemical performance test and the stress detection of lithium metal are realized.
S140, respectively acquiring detection signals of the first optical fiber sensor and the second optical fiber sensor through the demodulation system, and acquiring a lithium metal stress action signal in a lithium battery;
s150, analyzing the lithium metal growth state in the lithium battery according to the electrochemical test signal of the lithium battery measured by the battery performance test system and the lithium metal stress action signal.
According to the lithium dendrite in-situ detection method based on the optical fiber sensors, the surface state of the pole piece to be detected is monitored through the two optical fiber sensors, the growth condition of the lithium dendrite on the surface of the electrode can be monitored in situ on the basis of keeping the configuration of a commercial battery, and meanwhile, the growth condition of the lithium dendrite is compared with an electrochemical test signal. The method has the advantages that the battery can be operated in a conventional form, meanwhile, nondestructive monitoring is carried out, the stress change of the surface of the electrode is read, basic scientific problem research can be carried out, and failure early warning can be carried out. In addition, due to the adoption of the two optical fiber sensors, signals of the optical fibers can be compared through temperature sensitive response, signals of the stress sensitive response main optical fibers are decoupled, signals of stress main action are extracted, and the accuracy of the signals is ensured.
Specifically, the other ends of the first optical fiber sensor and the second optical fiber sensor pass through an aluminum-plastic film on a lithium battery and extend out of the aluminum-plastic film, wherein the lithium battery is connected with a battery performance testing system, which includes:
and sequentially penetrating the other ends of the first optical fiber sensor and the second optical fiber sensor through aluminum plastic films on a plurality of lithium batteries and finally connecting the other ends of the first optical fiber sensor and the second optical fiber sensor with a demodulation system, wherein the plurality of lithium batteries are connected in series or in parallel and then are connected with a battery performance test system.
As shown in fig. 3, continuous distribution monitoring of multiple lithium batteries can be simultaneously achieved, in this embodiment, optical fibers are installed in the protective sleeve 13 and introduced into holes of the aluminum-plastic film, then the lithium batteries are packaged and injected, the individual lithium batteries are connected in series through the optical fiber sensor group 20 (including the first optical fiber sensor and the second optical fiber sensor), demodulation and analysis are performed through the demodulation system after composite signals are collected, in addition, the multiple lithium batteries can be connected in series or in parallel, specifically, selection is performed as required, no setting is made here, the battery testing system connects the lithium battery packs connected in series or connected in parallel, electrochemical signals are detected, and finally, distributed continuous pole piece state monitoring of the battery packs can be achieved.
Specifically, the passing the other ends of the first optical fiber sensor and the second optical fiber sensor through an aluminum plastic film on a lithium battery and out of the aluminum plastic film includes:
and after the other ends of the first optical fiber sensor and the second optical fiber sensor are both arranged in the protective sleeve 13, the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate into an aluminum plastic film on the lithium battery and extend out of the aluminum plastic film.
It should be understood that the other end of the first optical fiber sensor and the other end of the second optical fiber sensor can be fixed by the protection sleeve 13 before penetrating into the aluminum plastic film of the lithium battery, and similarly, the other protection sleeve 13 can be used to fix the other end of the first optical fiber sensor and the other end of the second optical fiber sensor when extending out of the aluminum plastic film 11.
The protection sleeve 13 and the aluminum-plastic film 11 may be bonded and sealed by epoxy resin to prevent leakage after injection.
Specifically, the obtaining, by the demodulation system, detection signals of the first optical fiber sensor and the second optical fiber sensor, respectively, and obtaining a lithium metal stress action signal in a lithium battery includes:
the demodulation system demodulates and analyzes the acquired first optical fiber sensor to obtain a first demodulation signal, the demodulation system demodulates and analyzes the acquired second optical fiber sensor to obtain a second demodulation signal, the first demodulation signal comprises a lithium metal stress action signal and a temperature interference signal of a lithium battery, and the second demodulation signal comprises a temperature interference signal;
and subtracting the second demodulation signal from the first demodulation signal to obtain a lithium metal stress action signal in the lithium battery.
In some embodiments, the same metal material as the pole piece to be detected comprises any one of copper, gold and silver.
It should be understood that the same metallic materials as the pole pieces to be tested also include various alloys.
In summary, the method for in-situ detection of lithium dendrite based on the optical fiber sensor provided by the embodiment of the invention utilizes a stress sensitive response main optical fiber sensor and a temperature sensitive response contrast optical fiber sensor to continuously monitor the surface state of the electrode in real time, and combines an electrochemical test signal to expect to achieve nondestructive in-situ monitoring. The method has the advantages of high measurement precision, strong expansibility, lower cost and the like.
As another embodiment of the present invention, there is provided a system for in-situ detection of lithium dendrite based on a fiber sensor, as shown in fig. 2, including: the detection device comprises a first optical fiber sensor, a second optical fiber sensor, a broadband light source 14, a lithium battery, a demodulation system 15 and a battery test system 16, wherein a metal material which is the same as that of a pole piece to be detected is evaporated on the surface of the first optical fiber sensor, a protective sleeve is sleeved on the surface of the second optical fiber sensor, one end of the first optical fiber sensor and one end of the second optical fiber sensor are both connected with the broadband light source 14, the other end of the first optical fiber sensor and the other end of the second optical fiber sensor penetrate through an aluminum-plastic film 11 on the lithium battery and extend out of the aluminum-plastic film 11 to be connected with the demodulation system 15, and the battery test system 16 is connected with the lithium battery;
the demodulation system 15 can acquire detection signals of the first optical fiber sensor and the second optical fiber sensor, and obtain a lithium metal stress action signal in the lithium battery, and the battery performance test system 16 can measure an electrochemical test signal of the lithium battery.
According to the lithium dendrite in-situ detection system based on the optical fiber sensors, the surface state of the pole piece to be detected is monitored through the two optical fiber sensors, the growth condition of the lithium dendrite on the surface of the electrode can be monitored in situ on the basis of keeping the configuration of a commercial battery, and meanwhile, the growth condition of the lithium dendrite is compared with an electrochemical test signal. The method has the advantages that the battery can be operated in a conventional form, meanwhile, nondestructive monitoring is carried out, the stress change of the surface of the electrode is read, basic scientific problem research can be carried out, and failure early warning can be carried out. In addition, due to the adoption of the two optical fiber sensors, signals of the optical fibers can be compared through temperature sensitive response, signals of the stress sensitive response main optical fibers are decoupled, signals of stress main action are extracted, and the accuracy of the signals is ensured.
Specifically, as shown in fig. 3, the optical fiber sensor-based lithium dendrite in-situ detection system includes a plurality of lithium batteries, the other end of the first optical fiber sensor and the other end of the second optical fiber sensor sequentially penetrate through a plurality of aluminum plastic films on the lithium batteries and are finally connected with a demodulation system, and the plurality of lithium batteries are connected in series or in parallel and then are connected with the battery performance test system.
Specifically, the system for in-situ detection of lithium dendrites based on the optical fiber sensor further comprises: and the protective sleeve 13 is sleeved on the other ends of the first optical fiber sensor and the second optical fiber sensor and used for fixing the other ends of the first optical fiber sensor and the second optical fiber sensor together.
In some embodiments, the same metal material as the pole piece to be detected comprises any one of copper, gold and silver.
For a specific working principle of the optical fiber sensor-based lithium dendrite in-situ detection system provided by the embodiment of the invention, reference may be made to the foregoing description of the optical fiber sensor-based lithium dendrite in-situ detection method, and details are not repeated here.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A lithium dendrite in-situ detection method based on an optical fiber sensor is characterized by comprising the following steps:
evaporating a metal material which is the same as that of a pole piece to be detected on the surface of a first optical fiber sensor, sleeving a protective sleeve on the surface of a second optical fiber sensor, and connecting one end of each of the first optical fiber sensor and the second optical fiber sensor with a broadband light source;
the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate through an aluminum-plastic film on a lithium battery and extend out of the aluminum-plastic film to be connected with a demodulation system, wherein the lithium battery is connected with a battery performance testing system;
sealing the aluminum-plastic film, and injecting electrolyte into the aluminum-plastic film;
respectively acquiring detection signals of the first optical fiber sensor and the second optical fiber sensor through the demodulation system, and acquiring a lithium metal stress action signal in a lithium battery;
and analyzing the lithium metal growth state in the lithium battery according to the electrochemical test signal of the lithium battery measured by the battery performance test system and the lithium metal stress action signal.
2. The method for in-situ detection of lithium dendrite based on optical fiber sensor according to claim 1 wherein the other end of the first optical fiber sensor and the other end of the second optical fiber sensor are together passed through an aluminum plastic film on a lithium battery and extended out of the aluminum plastic film, wherein the lithium battery is connected to a battery performance testing system, comprising:
and sequentially penetrating the other ends of the first optical fiber sensor and the second optical fiber sensor through aluminum plastic films on a plurality of lithium batteries and finally connecting the other ends of the first optical fiber sensor and the second optical fiber sensor with a demodulation system, wherein the plurality of lithium batteries are connected in series or in parallel and then are connected with a battery performance test system.
3. The method for in-situ detection of lithium dendrite based on optical fiber sensor according to claim 1 or 2, wherein the step of passing the other end of the first optical fiber sensor and the other end of the second optical fiber sensor together through the aluminum plastic film on the lithium battery and out of the aluminum plastic film comprises:
and after the other ends of the first optical fiber sensor and the second optical fiber sensor are both arranged in the protective sleeve, the other ends of the first optical fiber sensor and the second optical fiber sensor penetrate into an aluminum-plastic film on the lithium battery and extend out of the aluminum-plastic film.
4. The method for in-situ detection of lithium dendrite based on optical fiber sensor according to claim 1, wherein the obtaining the detection signals of the first optical fiber sensor and the second optical fiber sensor respectively through the demodulation system and obtaining the lithium metal stress action signal in the lithium battery comprises:
the demodulation system demodulates and analyzes the acquired first optical fiber sensor to obtain a first demodulation signal, the demodulation system demodulates and analyzes the acquired second optical fiber sensor to obtain a second demodulation signal, the first demodulation signal comprises a lithium metal stress action signal and a temperature interference signal of a lithium battery, and the second demodulation signal comprises a temperature interference signal;
and subtracting the second demodulation signal from the first demodulation signal to obtain a lithium metal stress action signal in the lithium battery.
5. The method for in-situ detection of lithium dendrites based on the optical fiber sensor according to claim 1, wherein the metal material same as that of the pole piece to be detected comprises any one of copper, gold and silver.
6. An in-situ lithium dendrite detection system based on a fiber sensor, comprising: the detection device comprises a first optical fiber sensor, a second optical fiber sensor, a broadband light source, a lithium battery, a demodulation system and a battery test system, wherein a metal material which is the same as that of a pole piece to be detected is evaporated on the surface of the first optical fiber sensor, a protective sleeve is sleeved on the surface of the second optical fiber sensor, one end of the first optical fiber sensor and one end of the second optical fiber sensor are both connected with the broadband light source, the other end of the first optical fiber sensor and the other end of the second optical fiber sensor penetrate through an aluminum-plastic film on the lithium battery and extend out of the aluminum-plastic film to be connected with the demodulation system, and the battery test system is connected with the lithium battery;
the demodulation system can acquire detection signals of the first optical fiber sensor and the second optical fiber sensor and obtain a lithium metal stress action signal in the lithium battery, and the battery performance test system can measure an electrochemical test signal of the lithium battery.
7. The optical fiber sensor-based lithium dendrite in-situ detection system of claim 6 wherein the optical fiber sensor-based lithium dendrite in-situ detection system comprises a plurality of lithium batteries, the other end of the first optical fiber sensor and the other end of the second optical fiber sensor sequentially penetrate through aluminum plastic films on the plurality of lithium batteries and are finally connected with a demodulation system, and the plurality of lithium batteries are connected with the battery performance test system after being connected in series or in parallel.
8. The fiber sensor-based lithium dendrite in-situ detection system of claim 6 or 7 further comprising: and the protective sleeve is sleeved at the other ends of the first optical fiber sensor and the second optical fiber sensor and used for fixing the other ends of the first optical fiber sensor and the second optical fiber sensor together.
9. The system for in-situ detection of lithium dendrite based on the optical fiber sensor according to claim 6, wherein the same metal material as the pole piece to be detected comprises any one of copper, gold and silver.
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| CN113078375A (en) * | 2021-02-09 | 2021-07-06 | 南京大学 | Battery monitoring system and monitoring method |
| WO2022252532A1 (en) * | 2021-05-29 | 2022-12-08 | 浙江大学 | Lithium ion battery allowing implantation of optical sensor by optical fiber, and manufacturing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113078375A (en) * | 2021-02-09 | 2021-07-06 | 南京大学 | Battery monitoring system and monitoring method |
| WO2022252532A1 (en) * | 2021-05-29 | 2022-12-08 | 浙江大学 | Lithium ion battery allowing implantation of optical sensor by optical fiber, and manufacturing method |
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