In-situ detection system for gas production of battery

Abstract

The utility model discloses a battery gas production in-situ detection system, and relates to the technical field of battery detection, the battery gas production in-situ detection system comprises a Raman spectrometer and a spectrum optical fiber, the Raman spectrometer is provided with an optical fiber probe, and the optical fiber probe is provided with a light emitting optical fiber and a receiving optical fiber; the spectrum optical fiber is provided with a coupling channel, and an air inlet end and a detection end which are communicated with the coupling channel, and the detection end is arranged opposite to the optical fiber probe; the Raman spectrometer emits exciting light into the coupling channel through the light-emitting optical fiber and receives Raman light generated in the coupling channel through the receiving optical fiber. According to the technical scheme, the accuracy of gas production detection of the battery can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to an in-situ detection system for battery gas generation. Background Technology

[0002] With the development of battery technology, battery cells are being applied in more and more fields, gradually replacing traditional petrochemical energy in the automotive power sector. During battery charging and discharging, chemical reactions may occur at the battery electrodes and electrolyte interfaces, releasing gases. Detecting and analyzing the gases generated by the battery can provide guidance for subsequent battery optimization design. Currently, for operating conditions with low gas production and low gas concentration, the detection effect of battery gas production is poor, and the detection and analysis results are inaccurate. Utility Model Content

[0003] The main objective of this invention is to propose an in-situ detection system for battery gas generation, aiming to improve the accuracy of battery gas generation detection.

[0004] To achieve the above objectives, the present invention proposes an in-situ detection system for battery gas generation, comprising:

[0005] A Raman spectrometer, wherein the Raman spectrometer has an optical fiber probe, the optical fiber probe being provided with an output optical fiber and a receiving optical fiber; and

[0006] The spectral fiber is provided with a coupling channel, and an air inlet and a detection end connected to the coupling channel, wherein the detection end is arranged opposite to the fiber optic probe.

[0007] The Raman spectrometer emits excitation light into the coupling channel through the light-emitting optical fiber and receives the Raman light generated in the coupling channel through the receiving optical fiber.

[0008] The technical solution of this application employs Raman spectroscopy for detecting gas generation from batteries. The battery under test can be connected to a spectral fiber, and the gas generated by the battery can enter the coupling channel of the spectral fiber. The Raman spectrometer emits excitation light into the coupling channel, which couples with the gas in the coupling channel to generate Raman light. The Raman spectrometer receives the Raman light through the receiving fiber in the fiber optic probe for spectral analysis, thereby achieving in-situ detection of gas generation from the battery. Using this in-situ detection system for battery gas generation, the generated gas from the battery can be directly introduced into the coupling channel to achieve coupling with the detection light source for signal excitation and reception. This detection method mainly relies on the repeated refraction of light in the spectral fiber to increase the optical path and enhance the response signal. It eliminates the need for complex optical path structures and can accurately detect low-concentration, low-volume gases, effectively enhancing the in-situ detection capability of the fiber optic and improving the accuracy of battery gas generation detection.

[0009] In some embodiments of this application, the battery gas generation in-situ detection system further includes:

[0010] A coupling structure, wherein the coupling structure is provided with an optical path positioned opposite to the optical fiber probe, and the coupling structure is connected to the detection end; and

[0011] A focusing lens is disposed on the coupling structure and is positioned opposite to the optical path.

[0012] This setup allows for the fixing of the detection end of the spectral fiber through a coupling structure, while the focusing lens enhances the optical signal focusing capability, improving the fiber optic probe's ability to emit and receive light, thus improving detection capabilities. This is beneficial for decoupling and analyzing low-concentration and low-volume gases, thereby increasing detection accuracy. Furthermore, it facilitates structural and functional expansion of the detection system through the design of the coupling structure.

[0013] In some embodiments of this application, the coupling structure includes a first connector and a second connector that overlap each other, a lens mounting cavity is formed between the first connector and the second connector, the second connector is provided with the optical path, and the focusing lens is disposed in the lens mounting cavity;

[0014] The first connector is connected to the fiber optic probe, and the second connector is connected to the detection end.

[0015] In this configuration, the focusing lens is positioned between the first and second connectors, which protects the focusing lens and prevents light leakage and external light from affecting the detection structure.

[0016] In some embodiments of this application, the coupling structure further includes a seal located between the first connector and the second connector, and disposed around the optical path.

[0017] This configuration improves the sealing capability of the coupling structure, preventing air leakage and ensuring accurate testing.

[0018] In some embodiments of this application, the coupling structure is provided with a cavity communicating with the optical path and an expansion interface communicating with the cavity, the expansion interface being configured to connect any one of an air pump, a barometer, and a thermometer.

[0019] This approach allows for the connection of power components such as air pumps and detection sensors such as temperature and pressure by setting an expansion interface on the coupling structure. For example, an air pump can be connected to the coupling structure to provide the power for gas diffusion, enabling the battery-generated gas or calibration gas to diffuse rapidly into the spectral fiber, thereby improving detection efficiency.

[0020] Additionally, a barometer can be connected to the coupling structure to detect the gas production from the battery and pressure changes in the coupling channel. This allows for a comprehensive assessment of the impact of pressure changes on the Raman signal, leading to more accurate detection and analysis results. Similarly, a thermometer can be connected to the coupling structure to detect gas temperature changes, thereby allowing for a comprehensive assessment of the impact of temperature changes on the Raman signal and achieving more accurate detection and analysis results.

[0021] In some embodiments of this application, the coupling structure is provided with a first male connector, the detection end is provided with a first female connector, and the first male connector is connected to the first female connector.

[0022] This setup makes it easy to assemble and disassemble the coupling structure and the spectral fiber, and is convenient to use.

[0023] In some embodiments of this application, the first male connector and the first female connector are threaded together.

[0024] This setup ensures a strong connection between the spectral fiber and the coupling structure, making them difficult to separate and providing good airtightness to prevent leaks and guarantee detection accuracy.

[0025] In some embodiments of this application, the fiber optic probe further includes a filter structure, wherein the output fiber and the receiving fiber are located on the side of the filter structure opposite to the spectral fiber.

[0026] In this configuration, the excitation light emitted from the output optical fiber is filtered and then enters the coupling channel. The Raman light generated by photo-gas coupling is received by the receiving optical fiber through the filter structure. The filter structure can filter out the excited Rayleigh scattering light and other stray light to improve detection accuracy.

[0027] In some embodiments of this application, the battery gas generation in-situ detection system further includes a gas chamber structure, wherein the gas chamber structure is provided with a buffer cavity communicating with the gas inlet end.

[0028] In this configuration, the gas generated by the battery under test first enters the gas chamber structure and then flows to the coupling channel of the spectral fiber. The gas chamber structure acts as a buffer, preventing electrolyte from being directly sprayed into the coupling channel when electrolyte splashes from the battery under test, thus avoiding electrolyte contamination and corrosion of the spectral fiber.

[0029] In some embodiments of this application, the battery gas generation in-situ detection system further includes a drying device connected to the gas inlet.

[0030] This configuration allows the gas generated by the battery to pass through a drying structure before being introduced into the optical fiber. During this process, if the electrolyte from the battery flows out with the gas, it can be absorbed by the drying device to prevent the electrolyte from entering the optical fiber and Raman spectrometer with the gas, thus avoiding contamination of precision components. This can prevent problems such as test signal attenuation and equipment failure, ensuring the stability and accuracy of the detection system.

[0031] In some embodiments of this application, the air inlet is provided with a second female connector, which is used to connect to a second male connector located on the battery under test;

[0032] Alternatively, the battery gas generation in-situ detection system may further include a gas guiding structure, which has an air inlet channel and a second male connector connected to the second female connector.

[0033] This configuration makes it easy to assemble and disassemble the air inlet of the spectral fiber with the battery or air delivery structure under test, thus facilitating its use.

[0034] In some embodiments of this application, the second male connector and the second female connector are threaded together.

[0035] This configuration ensures a strong connection between the second male connector and the second female connector, making them difficult to separate and providing good airtightness to prevent leaks and guarantee testing accuracy. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a connection structure diagram of the spectral optical fiber in the battery gas generation in-situ detection system provided in some embodiments of this application;

[0038] Figure 2 for Figure 1 Cross-sectional view of the detection end of the optical fiber for spectroscopy;

[0039] Figure 3 for Figure 1 A cross-sectional view of the air inlet end of the optical fiber;

[0040] Figure 4 This is a schematic diagram of the photo-gas coupling connection of a battery gas generation in-situ detection system provided in some embodiments of this application.

[0041] Explanation of icon numbers:

[0042] 100. Battery Gas Generation In-situ Detection System; 1. Raman Spectrometer; 11. Fiber Optic Probe; 12. Exciter; 13. Photodetector; 2. Spectroscopic Fiber; 21. Coupling Channel; 22. Gas Inlet; 23. Detection End; 24. First Female Connector; 25. Second Female Connector; 3. Coupling Structure; 31. First Connector; 32. Second Connector; 33. Seal; 34. First Male Connector; 35. Optical Path; 36. Cavity; 37. Expansion Interface; 38. Lens Mounting Cavity;

[0043] 4. Focusing lens; 5. Air chamber structure; 6. Drying device; 7. Air guiding structure; 71. Second male connector; 72. Air inlet channel; 8. Barometer; 9. Air pump.

[0044] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0051] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0054] The batteries described in this application can be categorized into primary batteries and rechargeable batteries based on whether they are rechargeable. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Batteries are currently widely used in electrical devices such as vehicles, ships, and aircraft.

[0055] During battery charging and discharging, chemical reactions may occur at the battery electrodes and electrolyte interface, releasing gases. In the battery manufacturing process, assembled batteries need to undergo three processes: electrolyte injection, formation, and aging, to produce a finished battery. Electrolyte injection involves injecting electrolyte into a vacuum-dried, deeply dehydrated battery casing. Formation is the charging process after electrolyte injection, and aging involves placing the formed battery at a specific temperature for a period of time. Simulating the chemical self-discharge process during the battery formation stage and analyzing the gases produced by the battery can provide guidance for subsequent battery optimization design. Currently, for operating conditions with low gas production and low gas concentration, the effectiveness of battery gas production detection is poor, and the analysis results are inaccurate.

[0056] Based on the above issues, please refer to Figures 1 to 4 This invention proposes an in-situ detection system 100 for battery gas generation. The in-situ detection system 100 includes a Raman spectrometer 1 and a spectral fiber 2. The Raman spectrometer 1 has a fiber optic probe 11, which is provided with an output fiber and a receiving fiber. The spectral fiber 2 is provided with a coupling channel 21, and an inlet end 22 and a detection end 23 connected to the coupling channel 21. The detection end 23 is arranged opposite to the fiber optic probe 11. The Raman spectrometer 1 emits excitation light into the coupling channel 21 through the output fiber and receives the Raman light generated in the coupling channel 21 through the receiving fiber.

[0057] In the technical solution of this application, Raman spectroscopy is used for in-situ detection of battery gas generation. The in-situ battery gas generation detection system 100 includes a Raman spectrometer 1 and a spectral fiber 2.

[0058] Raman spectrometer 1 can obtain Raman scattering spectra. These spectra reflect the intensity of light at different wavelengths. When a gas is irradiated with excitation light of a single wavelength, some photons change frequency upon collision with gas molecules, producing Raman scattered light. The frequencies of these scattered Raman lights differ from the incident light frequency. By detecting and analyzing these frequency differences, the structure and composition of the gas molecules can be inferred. Because different gases produce Raman scattering at different wavelengths, different peaks in the spectrum represent different gases.

[0059] The Raman spectrometer 1 is equipped with an optical fiber probe 11 for emitting excitation light and receiving the scattered light after excitation. The optical fiber probe 11 contains an emitting optical fiber and a receiving optical fiber. The Raman spectrometer 1 also includes an exciter 12 connected to the emitting optical fiber and a photodetector 13 connected to the receiving optical fiber. The exciter 12 generates excitation light, which can be transmitted to the detection area (i.e., the coupling channel 21 of the spectral optical fiber 2) through the emitting optical fiber. The Raman light generated after the excitation light couples with the detection gas can be transmitted to the photodetector 13 through the receiving optical fiber. The photodetector 13 converts the optical signal into an electrical signal based on the photoelectric effect to form spectral data. Integrating the emitting and receiving optical fibers into the optical fiber probe 11 makes connection and use more convenient.

[0060] The spectral fiber 2 serves as the photo-gas coupling structure 3 and is configured as a hollow fiber. A coupling channel 21 is provided within the spectral fiber 2, with both ends of the coupling channel 21 open. One end is the gas inlet 22, used to introduce the gas generated by the battery under test or the calibration gas. A calibration gas of known concentration can be introduced into the coupling channel 21 for detection to obtain a calibration spectral signal. When detecting gas generation in the battery under test, the battery is connected to the gas inlet 22, allowing the gas generated by the battery to be introduced into the coupling channel 21. The other end of the spectral fiber 2 serves as the detection end 23. The fiber optic probe 11 of the Raman spectrometer 1 is positioned opposite the detection end 23, i.e., the fiber optic probe 11 is oriented towards the detection end 23. Optionally, the fiber optic probe 11 and the detection end 23 can be coaxially aligned, or they can be partially aligned, or they can be offset by a certain distance. It is only necessary that the excitation light generated by the Raman spectrometer 1 can enter the coupling channel 21 from the detection end 23. The excitation light couples with the gas in the coupling channel 21 and is refracted and reflected in the coupling channel 21. The Raman light generated after photo-gas coupling can be collected and received by the receiving fiber in the fiber optic probe 11 at the detection end 23, and fed back to the photodetector 13 to form spectral data.

[0061] In this embodiment, during battery gas generation detection, the battery under test is connected to the spectral fiber 2. The gas generated by the battery can enter the coupling channel 21 of the spectral fiber 2. The Raman spectrometer 1 emits excitation light into the coupling channel 21. The excitation light couples with the gas in the coupling channel 21 to generate Raman light. The Raman spectrometer 1 receives the Raman light through the receiving fiber in the fiber optic probe 11 for spectral analysis, thereby achieving in-situ detection of battery gas generation. Using this in-situ battery gas generation detection system 100, the battery gas is directly introduced into the coupling channel 21 to achieve coupling with the detection light source for signal excitation and reception. This detection method mainly relies on the repeated refraction of light in the spectral fiber 2 to increase the optical path and enhance the response signal. It eliminates the need for complex optical path structures and can accurately detect low-concentration, low-volume gases, effectively enhancing the in-situ detection capability of the fiber optic and improving the accuracy of battery gas generation detection.

[0062] Please see Figure 1 and Figure 2 In some embodiments of this application, the battery gas generation in-situ detection system 100 further includes a coupling structure 3 and a focusing lens 4. The coupling structure 3 is provided with an optical path 35 that is disposed opposite to the optical fiber probe 11, and the coupling structure 3 is connected to the detection end 23. The focusing lens 4 is disposed on the coupling structure 3 and is disposed opposite to the optical path 35.

[0063] In this embodiment, the coupling structure 3 is connected to the detection end 23 of the spectral fiber 2 to facilitate fixing the detection end 23 of the spectral fiber 2. In addition, it also facilitates the structural and functional expansion of the detection system by designing the coupling structure 3. For example, it facilitates the installation of the focusing lens 4, the filter structure, and the extension connection of the air pump 9, the barometer 8, and the thermometer, etc., as shown in the following embodiment, in the fiber optic probe 11.

[0064] The focusing lens 4 enhances the focusing capability of the optical signal, improves the light emission and reception capabilities of the fiber optic probe 11, and enhances detection capabilities. This facilitates the decoupling and analysis of low-concentration and low-volume gases, thereby improving detection accuracy. Furthermore, the focusing lens 4 acts as a window to prevent gases and battery electrolytes from entering the fiber optic probe 11, avoiding contamination of precision components. This prevents signal attenuation and equipment malfunctions, ensuring the stability and accuracy of the detection system. Optionally, the focusing lens 4 can be embedded inside the coupling structure 3 or positioned on its surface.

[0065] Please see Figure 2In some embodiments of this application, the coupling structure 3 includes a first connector 31 and a second connector 32 that overlap each other, forming a lens mounting cavity 38 between the first connector 31 and the second connector 32, and the second connector 32 is provided with an optical path 35. The focusing lens 4 is disposed in the lens mounting cavity 38. The first connector 31 is connected to the fiber optic probe 11, and the second connector 32 is connected to the detection end 23.

[0066] In this embodiment, the focusing lens 4 is disposed between the first connecting member 31 and the second connecting member 32, which can protect the focusing lens 4 and prevent light leakage and the influence of external light on the detection structure. Optionally, the first connecting member 31 and the second connecting member 32 are detachably connected, which can facilitate the disassembly, assembly, and maintenance of the focusing lens 4, and can also replace different types of focusing lenses 4 as needed, improving the flexibility of use. In some embodiments, the coupling structure 3 with different focusing lenses 4 can also be replaced to suit different detection requirements.

[0067] Please see Figure 1 and Figure 2 In some embodiments of this application, the coupling structure 3 further includes a seal 33, which is located between the first connector 31 and the second connector 32 and is disposed around the optical path 35.

[0068] In this embodiment, the sealing element 33 can be configured as at least one of a sealing gasket, sealant, etc. By setting the sealing element 33, the sealing capability of the coupling structure 3 is improved, and the problem of air leakage in the coupling structure 3 is avoided, so as to ensure the detection accuracy.

[0069] See also Figure 2 and Figure 4 In some embodiments of this application, the coupling structure 3 is provided with a cavity 36 communicating with the optical path 35, and an expansion interface 37 communicating with the cavity 36. The expansion interface 37 is configured to connect any one of the air pump 9, the barometer 8, and the thermometer.

[0070] In this embodiment, an expansion interface 37 is provided on the coupling structure 3 to facilitate the connection of power components such as the air pump 9 and detection sensors such as temperature and pressure sensors. For example, the air pump 9 can be connected to the coupling structure 3 to provide power for gas diffusion, allowing the battery-generated gas or calibration gas to diffuse rapidly into the spectral fiber 2, improving detection efficiency. Additionally, a barometer 8 can be connected to the coupling structure 3 to detect the amount of gas generated by the battery and pressure changes in the coupling channel 21, thereby integrating the influence of pressure changes on the Raman signal to obtain more accurate detection and analysis results. Similarly, a thermometer can be connected to the coupling structure 3 to detect gas temperature changes, thereby integrating the influence of temperature changes on the Raman signal to obtain more accurate detection and analysis results.

[0071] Optionally, one, two, or more expansion interfaces 37 can be provided in the coupling structure 3 for connecting functional devices such as the air pump 9, barometer 8, and thermometer, according to usage requirements. Alternatively, expansion interfaces 37 that do not require connection to functional devices can be closed.

[0072] Please see Figure 2 In some embodiments of this application, the coupling structure 3 is provided with a first male connector 34, the detection end 23 is provided with a first female connector 24, and the first male connector 34 is connected to the first female connector 24.

[0073] In this embodiment, the detection end 23 of the spectral fiber 2 is connected to the coupling structure 3 via a first male connector 34 and a first female connector 24. The first male connector 34 and the first female connector 24 can be plug-in, threaded, or otherwise, making it easy to assemble and disassemble the spectral fiber 2 and the fiber optic probe 11. Optionally, high-temperature grease and sealant can be applied after the first male connector 34 and the first female connector 24 are connected to improve sealing performance and ensure airtightness for long-term use.

[0074] In some embodiments of this application, the first male connector 34 and the first female connector 24 are threaded together.

[0075] In this embodiment, the detection end 23 of the spectral fiber 2 is connected to the fiber optic probe 11 by a first male connector 34 and a first female connector 24. The connection between the spectral fiber 2 and the coupling structure 3 is strong, not easy to separate, and has good airtightness, avoiding air leakage and ensuring detection accuracy.

[0076] In some embodiments of this application, the fiber optic probe 11 further includes a filter structure, with the output fiber and the receiving fiber located on the side of the filter structure away from the spectral fiber 2.

[0077] In this embodiment, the fiber optic probe 11 is also provided with a filter structure, which can be a long-pass filter film, a filter, etc. With this configuration, the excitation light emitted from the output fiber enters the coupling channel 21 after passing through the filter structure. The Raman light generated by the light-gas coupling passes through the filter structure and is received by the receiving fiber. The filter structure can filter out the excited Rayleigh scattering light and other stray light to improve the detection accuracy.

[0078] Please see Figure 4 In some embodiments of this application, the battery gas generation in-situ detection system 100 further includes a gas chamber structure 5, which is provided with a buffer cavity communicating with the air inlet end 22.

[0079] In this embodiment, the gas chamber structure 5 is provided with a buffer cavity, which is connected to the gas inlet 22 of the spectral fiber 2. This allows the gas generated by the battery under test to first enter the buffer cavity of the gas chamber structure 5 before flowing to the coupling channel 21 of the spectral fiber 2. By utilizing the buffering effect of the gas chamber structure 5, electrolyte splashing from the battery under test can be prevented from directly spraying into the coupling channel 21, thus avoiding electrolyte contamination and corrosion of the spectral fiber 2. Furthermore, since the battery gas generation in-situ detection system 100 of this application mainly relies on the refraction and reflection of light in the spectral fiber 2, there is no need to provide an excessively large gas chamber structure 5, thereby reducing the volume of the gas chamber structure 5.

[0080] Optionally, the gas chamber structure 5 can be configured as a housing structure for accommodating the battery under test, that is, the battery under test can be placed in the battery gas chamber; or the gas chamber structure 5 can be configured as a connecting structure between the battery under test and the spectral optical fiber 2, with the battery under test placed outside the gas chamber structure 5.

[0081] Please see Figure 4 In some embodiments of this application, the battery gas generation in-situ detection system 100 further includes a drying device 6 connected to the air inlet end 22.

[0082] In this embodiment, a drying structure is provided so that the gas generated by the battery passes through the drying structure before being introduced into the spectral fiber 2. With this configuration, if the electrolyte of the battery splashes outward and flows out with the gas, the drying device 6 can absorb the electrolyte, thereby preventing the electrolyte from entering the spectral fiber 2 and Raman spectrometer 1 with the gas, avoiding contamination of precision components, and thus avoiding problems such as test signal attenuation and equipment failure, ensuring the functional stability and detection accuracy of the detection system.

[0083] Optionally, the drying device 6 can be configured to adsorb the electrolyte and other moisture carried by the gas by setting an adsorbent; or, a drying bottle can be set with an outlet at the top of the drying bottle, and an inlet pipe for introducing gas can be inserted into the drying bottle; in this configuration, if the electrolyte enters the drying bottle with the gas, due to gravity, the electrolyte will remain at the bottom of the drying bottle, while the gas will flow upward to be discharged from the outlet, thereby achieving the effect of removing the electrolyte and preventing the electrolyte from flowing with the gas to the spectral fiber 2.

[0084] Please see Figure 1 and Figure 3 In some embodiments of this application, the air inlet 22 is provided with a second female connector 25, which is used to connect with a second male connector 71 located on the battery under test; or, the battery gas generation in-situ detection system 100 further includes an air guide structure 7, which is provided with an air inlet channel 72 and a second male connector 71, which is connected to the second female connector 25.

[0085] In this embodiment, a second female connector 25 is provided at the air inlet end 22 of the spectral fiber 2. Optionally, the second female connector 25 can be directly connected to the second male connector 71 provided on the battery under test. The second male connector 71 of the battery under test can be located at the cell liquid injection port, through which the battery gas is discharged, or an exhaust port can be provided on the cell. In some embodiments, the battery gas generation in-situ detection system 100 includes a gas guiding structure 7, which is used to connect to the battery under test. The gas guiding structure 7 can be directly connected to the battery under test, or it can be provided on the gas chamber structure 5 or the drying device 6 in the previous embodiment. A second male connector 71 is provided on the gas guiding structure 7, and the spectral fiber 2 is connected to the air inlet channel 72 of the gas guiding structure 7 by mating the second male connector 71 and the second female connector 25. The second male connector 71 and the second female connector 25 can be plug-in, threaded, etc., to facilitate the assembly and disassembly of the air inlet end 22 of the spectral fiber 2 to the battery under test or the gas guiding structure 7. Optionally, high-temperature grease and sealant can be applied after the second male connector 71 and the second female connector 25 are connected to improve sealing performance and ensure airtightness for long-term use.

[0086] In some embodiments of this application, the second male connector 71 and the second female connector 25 are threaded together.

[0087] This configuration, with the second male connector 71 and the second female connector 25 connected by threads, provides high connection strength, is not easily separated, and has good airtightness, avoiding air leakage and ensuring detection accuracy.

[0088] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery gas generation in-situ detection system, characterized in that, include: A Raman spectrometer, wherein the Raman spectrometer has an optical fiber probe, and the optical fiber probe is provided with an output optical fiber and a receiving optical fiber; and The spectral fiber is provided with a coupling channel, and an air inlet and a detection end connected to the coupling channel, wherein the detection end is arranged opposite to the fiber optic probe. The Raman spectrometer emits excitation light into the coupling channel through the light-emitting optical fiber and receives the Raman light generated in the coupling channel through the receiving optical fiber.

2. The battery gas generation in-situ detection system as described in claim 1, characterized in that, The battery gas generation in-situ detection system also includes: A coupling structure, wherein the coupling structure is provided with an optical path positioned opposite to the optical fiber probe, and the coupling structure is connected to the detection end; and A focusing lens is disposed on the coupling structure and is positioned opposite to the optical path.

3. The battery gas generation in-situ detection system as described in claim 2, characterized in that, The coupling structure includes a first connector and a second connector that overlap each other, a lens mounting cavity is formed between the first connector and the second connector, the second connector is provided with the optical path, and the focusing lens is disposed in the lens mounting cavity; The first connector is connected to the fiber optic probe, and the second connector is connected to the detection end.

4. The battery gas generation in-situ detection system as described in claim 3, characterized in that, The coupling structure further includes a seal located between the first connector and the second connector, and arranged around the optical path.

5. The battery gas generation in-situ detection system as described in claim 2, characterized in that, The coupling structure is provided with a cavity communicating with the optical path and an expansion interface communicating with the cavity. The expansion interface is configured to connect any one of an air pump, a barometer, and a thermometer.

6. The battery gas generation in-situ detection system as described in claim 2, characterized in that, The coupling structure is provided with a first male connector, and the detection end is provided with a first female connector, and the first male connector is connected to the first female connector.

7. The battery gas generation in-situ detection system as described in claim 6, characterized in that, The first male connector and the first female connector are threaded together.

8. The battery gas generation in-situ detection system as described in any one of claims 1 to 7, characterized in that, The fiber optic probe also includes a filter structure, with the output fiber and the receiving fiber located on the side of the filter structure opposite to the spectral fiber.

9. The battery gas generation in-situ detection system as described in any one of claims 1 to 7, characterized in that, The battery gas generation in-situ detection system also includes a gas chamber structure, which has a buffer cavity connected to the gas inlet end.

10. The battery gas generation in-situ detection system as described in any one of claims 1 to 7, characterized in that, The battery gas generation in-situ detection system also includes a drying device connected to the gas inlet.

11. The battery gas generation in-situ detection system as described in any one of claims 1 to 7, characterized in that, The air inlet end is provided with a second female connector, which is used to connect to a second male connector located on the battery under test. Alternatively, the battery gas generation in-situ detection system may further include a gas guiding structure, which has an air inlet channel and a second male connector connected to the second female connector.

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