Coating oven device and battery manufacturing equipment

Abstract

The embodiment of the utility model provides a coating oven device and battery manufacturing equipment. The coating oven device comprises a plurality of ovens and a temperature monitoring unit, wherein the temperature monitoring unit is used for monitoring temperature information of each oven; wherein the temperature monitoring unit comprises a central control demodulation system, an optical fiber and an optical fiber grating sensor; a fiber grating sensor is arranged in each drying oven, the optical fiber penetrates through the multiple drying ovens so that the fiber grating sensors in the multiple drying ovens can be sequentially connected in series and connected with the central control demodulation system, and the central control demodulation system is used for demodulating optical signals transmitted by the fiber grating sensors so as to obtain temperature information of the drying ovens. According to the technical scheme, the precision of monitoring the temperature in the oven can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a coating oven device and battery manufacturing equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the manufacturing process of batteries, after the electrode is coated, it needs to be placed in a coating oven for drying to achieve the drying of the electrode. The existing coating oven has the problem of low temperature monitoring accuracy, which affects the drying effect of the electrode. Utility Model Content

[0004] The present application provides a coating oven device and a battery manufacturing device, which can improve the accuracy of temperature monitoring inside the oven.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a coating oven device, which includes multiple ovens and a temperature monitoring unit, and the temperature monitoring unit is used to monitor the temperature information of each oven; wherein the temperature monitoring unit includes a central control demodulation system, an optical fiber and a fiber grating sensor; a fiber grating sensor is provided in each oven, and the optical fiber is passed through multiple ovens to connect the fiber grating sensors in the multiple ovens in series in sequence and connect them to the central control demodulation system, and the central control demodulation system is used to demodulate the optical signal transmitted by the fiber grating sensor to obtain the temperature information of each oven.

[0007] In this solution, each oven is provided with a fiber grating sensor, and optical fibers are used to connect the fiber grating sensors in multiple ovens in series to form an optical path network. When the temperature of the air in the oven changes, with air as the medium, the temperature change of the air will cause the fiber grating sensor in the oven to undergo corresponding microscopic deformation, which in turn causes the wavelength of the optical signal transmitted by the optical fiber to change. The central control demodulation system calculates the temperature data of the corresponding oven by demodulating the change of the optical signal, thereby obtaining the temperature information of the oven. This solution uses fiber grating sensors to monitor the temperature of the oven. The optical fiber is used as the conduction path. The transmission of the optical signal in the optical fiber is not affected by the electromagnetic environment, and the signal stability is high. In addition, the fiber grating sensor has high sensitivity, which can improve the temperature monitoring accuracy of the oven, thereby improving the drying uniformity of the electrode and the consistency of the battery performance.

[0008] According to some embodiments of the present application, the fiber grating sensor is mounted on the inner wall of the oven via a bracket.

[0009] In the above solution, the fiber grating sensor is installed on the inner wall of the oven through a bracket, and the fiber grating sensor does not directly contact the inner wall of the oven, which is not likely to affect the temperature measurement accuracy of the fiber grating sensor.

[0010] According to some embodiments of the present application, the bracket is disposed between the optical fiber sensor and the inner wall of the oven so that there is a gap between the optical fiber grating sensor and the inner wall of the oven.

[0011] In the above scheme, by setting the bracket, a gap is created between the fiber grating sensor and the inner wall of the oven, and the gap allows the gas inside the oven to flow freely, maintaining the fluidity of the internal space of the oven. Even if the temperature in the oven changes, the fiber grating sensor can quickly sense it, and the fiber grating sensor can measure the temperature in the oven more accurately, and the temperature monitoring is more real-time.

[0012] According to some embodiments of the present application, the bracket includes a first rod and a second rod, the first rod and the second rod are arranged at an angle, one end of the first rod and the second rod intersect at a first node and are connected to the inner wall of the oven, and the other end of the first rod and the second rod are connected to the fiber optic grating sensor.

[0013] In the above scheme, the bracket includes a first rod and a second rod, and the first rod and the second rod install the fiber grating sensor to the inner wall of the oven. The first rod, the second rod and the fiber grating sensor form a triangular structure. The triangular structure has strong stability, which can ensure the installation strength of the fiber grating sensor on the oven. At the same time, the space area between the first rod and the second rod can be used for gas to pass, which reduces the obstruction to the gas flow in the area where the fiber grating sensor is located, and ensures the accuracy of temperature monitoring.

[0014] According to some embodiments of the present application, the optical fiber is passed through the fiber grating sensor, and the fiber grating sensor has a first side away from the inner wall of the oven, and the first side is used to monitor the temperature of the air in the oven.

[0015] In the above scheme, since the air on the side of the fiber grating sensor close to the inner wall of the oven is easily affected by the temperature of the inner wall of the oven, the temperature of the space on the side of the inner wall of the oven cannot accurately reflect the actual temperature of the air in the oven. Therefore, by using the first side of the fiber grating sensor away from the inner wall of the oven to monitor the temperature of the gas in the oven, the temperature monitored by the fiber grating sensor is more accurate and has higher precision.

[0016] According to some embodiments of the present application, the fiber grating sensor has a second side close to the inner wall of the oven, and the second side is used to monitor the solvent concentration in the oven.

[0017] In the above scheme, by placing the fiber grating sensor close to the second side of the inner wall of the oven to monitor the concentration of the cathode and cathode solvents in the oven, the concentration of the cathode and cathode solvents can be monitored online to ensure the traceability of the drying effect of the coating process.

[0018] According to some embodiments of the present application, along the height direction of the oven, the oven includes a first wall and a second wall that are oppositely distributed, and both the first wall and the second wall are provided with at least one fiber grating sensor.

[0019] In the above scheme, by arranging at least one fiber grating sensor on the first wall and the second wall of the oven, the fiber grating sensor can realize temperature monitoring of the top area and the bottom area of ​​the oven and solvent concentration monitoring, with more monitoring points and a wider monitoring range. The temperature information and solvent concentration value inside the oven obtained by the temperature monitoring unit are more accurate.

[0020] According to some embodiments of the present application, a plurality of ovens are distributed in a rectangular array.

[0021] In the above scheme, the multiple ovens are distributed in an array, the distribution of the multiple ovens is simple, the occupied space is saved, the spatial layout is reasonable, and it is also convenient for the arrangement of the temperature monitoring unit.

[0022] According to some embodiments of the present application, the central control demodulation system is disposed outside the oven.

[0023] In the above scheme, the central control demodulation system is set outside the oven, independently of the oven, so that the staff can know the temperature conditions of each oven in real time and set relevant parameters of the central control demodulation system.

[0024] In a second aspect, an embodiment of the present application further provides a battery manufacturing device, the battery manufacturing device comprising the coating oven device of any of the aforementioned embodiments.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of oven temperature monitoring in the prior art;

[0028] Figure 2 A schematic diagram of the structure of a coating oven device provided in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of the structure of a single oven in a coating oven device provided in some embodiments of the present application;

[0030] Figure 4 A schematic diagram of the structure of a bracket provided in some embodiments of the present application;

[0031] Figure 5 A schematic diagram of a structure in which the bracket provided in some other embodiments of the present application is a telescopic rod;

[0032] Figure 6 A cross-sectional view of a fiber grating sensor provided in some embodiments of the present application.

[0033] Icons: 100-coating oven device; 10-oven; 11-first wall; 12-second wall; 20-temperature monitoring unit; 21-central control demodulation system; 22-optical fiber; 221-first optical fiber segment; 222-second optical fiber segment; 223-optical fiber interface; 23-fiber grating sensor; 231-first side; 232-second side; 233-external package; 234-base; 235-sensitive area; 24-bracket; 241-first rod; 242-second rod; 243-third rod; 244-first node; 25-telescopic rod; 251-first screw; 252-second screw; 253-adjusting cylinder; 200-existing oven; 201-thermocouple; 202-central control system. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0040] In the present application, the battery may include a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application.

[0041] In the battery manufacturing process, after the electrode is coated, it needs to be placed in a coating oven for drying to achieve the drying of the electrode. The existing ovens have the problem of low temperature monitoring accuracy.

[0042] Please refer to Figure 1In the existing oven device, multiple existing ovens 200 generally use thermocouples 201 in parallel to collect the temperature of a single point during the drying process. The thermocouple 201 of each existing oven 200 is connected to the central control system 202 through an independent thermocouple cable. That is to say, multiple thermocouples 201 of multiple existing ovens 200 are connected to the central control system 202 in parallel, which makes the wiring arrangement difficult, the wiring is complex, and the electrical signal is easily interfered. The temperature errors of each collection point are easily superimposed, resulting in inaccurate control of the drying temperature of the membrane in the existing oven 200. The temperature control accuracy is ±3°C, and the temperature difference accuracy is low, which leads to uneven drying of the pole piece, affecting the drying effect of the pole piece, and further affecting the consistency of the battery.

[0043] In view of this, in order to solve the problem of low accuracy of temperature monitoring in an oven, some embodiments of the present application provide a coating oven device, which includes multiple ovens and a temperature monitoring unit, and the temperature monitoring unit is used to monitor the temperature information of each of the ovens; wherein the temperature monitoring unit includes a central control demodulation system, an optical fiber and a fiber grating sensor; a fiber grating sensor is provided in each oven, and the optical fiber is passed through multiple ovens to connect the fiber grating sensors in the multiple ovens in series in sequence and connect them to the central control demodulation system, and the central control demodulation system is used to demodulate the optical signal transmitted by the fiber grating sensor to obtain the temperature information of each oven.

[0044] In such a coating oven device, a fiber grating sensor is used to monitor the temperature of the oven. The optical fiber is used as a conduction path. The optical signal transmission in the optical fiber is not affected by the electromagnetic environment. The signal stability is high. In addition, the fiber grating sensor has high sensitivity, which can improve the temperature monitoring accuracy of the oven, thereby improving the drying uniformity of the electrode and improving the consistency of battery performance.

[0045] The present application embodiment provides a coating oven device, please refer to Figure 2 and Figure 3 The coating oven device 100 includes a plurality of ovens 10 and a temperature monitoring unit 20, wherein the temperature monitoring unit 20 is used to monitor the temperature information of each oven 10; wherein the temperature monitoring unit 20 includes a central control demodulation system 21, an optical fiber 22 and an optical fiber grating sensor 23; an optical fiber grating sensor 23 is provided in each oven 10, and the optical fiber 22 is passed through the plurality of ovens 10 so as to connect the optical fiber grating sensors 23 in the plurality of ovens 10 in series in sequence and connect them to the central control demodulation system 21, and the central control demodulation system 21 is used to demodulate the optical signal transmitted by the optical fiber grating sensor 23 so as to obtain the temperature information of each oven 10.

[0046] The oven 10 refers to a vacuum drying device that provides drying or drying functions for the anode and cathode sheets after coating.

[0047] The multiple ovens in the existing oven device generally use thermocouples to collect the temperature of a single point during the drying process. The line layout is difficult and complex, the electrical signal is easily interfered, and the temperature errors of each collection point are easily superimposed, resulting in inaccurate control of the drying temperature of the film in the oven 10, and the temperature control accuracy is ±3°C. The fiber grating sensor 23 is used to monitor the temperature inside the oven 10. Because the fiber grating sensor 23 uses optical signals for transmission, the optical signal is not affected by the electromagnetic environment, and the temperature monitoring accuracy of the oven 10 can be controlled within ±0.5°C.

[0048] Fiber Bragg sensor 23 is a type of fiber optic sensor. The sensing process based on fiber optic Bragg obtains sensing information by modulating the Bragg wavelength of the fiber optic by external physical parameters. It is a wavelength modulated fiber optic sensor.

[0049] The fiber grating sensor 23 can directly measure physical quantities such as temperature and strain. The fiber grating sensor 23 has the advantage of being resistant to electromagnetic interference. Generally, the frequency of electromagnetic radiation is much lower than that of light waves, so the optical signal transmitted in the optical fiber 22 is not affected by electromagnetic interference.

[0050] Optical fiber 22, optical fiber is the abbreviation of optical fiber, which is a fiber made of glass or plastic and can be used as a light transmission tool. The transmission principle is "total reflection of light".

[0051] The central control demodulation system 21, that is, the fiber Bragg grating demodulation system or the fiber Bragg grating demodulator, can be directly purchased. The central control demodulation system 21 is a part of the fiber Bragg grating demodulator, which is an instrument used in the fields of mechanics and physics. The central control demodulation system 21 demodulates the optical signal transmitted by the optical fiber 22 to achieve quantitative monitoring of the temperature of the oven 10.

[0052] The number of the fiber grating sensors 23 in each oven 10 may be one or more. For example, the number of the fiber grating sensors 23 in each oven 10 may be one, two or four. The specific number of the fiber grating sensors 23 in each oven 10 may be determined according to actual conditions.

[0053] In this solution, each oven 10 is provided with a fiber grating sensor 23, and the fiber grating sensors 23 in multiple ovens 10 are connected in series using optical fibers 22 to form an optical path network. When the temperature of the air in the oven 10 changes, with air as the medium, the temperature change of the air will cause the fiber grating sensor 23 in the oven 10 to undergo microscopic deformation accordingly, thereby causing the wavelength of the optical signal transmitted by the optical fiber 22 to change. The central control demodulation system 21 calculates the temperature data of the corresponding oven 10 by demodulating the change of the optical signal, thereby obtaining the temperature information of the oven 10. This solution uses a fiber grating sensor 23 to monitor the temperature of the oven 10. The optical fiber 22 is used as the conduction path. The optical signal transmission in the optical fiber 22 is not affected by the electromagnetic environment, and the signal stability is high. In addition, the fiber grating sensor 23 has high sensitivity, which can improve the temperature monitoring accuracy of the oven 10, thereby improving the drying uniformity of the electrode piece and improving the consistency of battery performance.

[0054] According to some embodiments of this application, please refer to Figure 3 The fiber grating sensor 23 is installed on the inner wall of the oven 10 through a bracket 24 .

[0055] The bracket 24 refers to a frame structure that provides a mounting function for the fiber grating sensor 23 .

[0056] The fiber grating sensor 23 is mounted on the inner wall of the oven 10 through the bracket 24 . The fiber grating sensor 23 does not directly contact the inner wall of the oven 10 , and is not likely to affect the temperature measurement accuracy of the fiber grating sensor 23 .

[0057] According to some embodiments of the present application, the bracket 24 is disposed between the optical fiber 22 sensor and the inner wall of the oven 10 , so that there is a gap between the optical fiber grating sensor 23 and the inner wall of the oven 10 .

[0058] The structure of the bracket 24 can be various, and the specific structure of the bracket 24 can be determined according to the actual situation. For example, the bracket 24 can be a rectangular frame, a connecting rod or a triangular frame or a telescopic bracket 24, etc.

[0059] The specific range of the gap can be determined according to actual conditions. For example, the range of the gap can be 5 cm-20 cm.

[0060] By setting the bracket 24, there is a gap between the fiber grating sensor 23 and the inner wall of the oven 10, and the gap allows the gas inside the oven 10 to flow freely, maintaining the fluidity of the internal space of the oven 10. Even if the temperature in the oven 10 changes, the fiber grating sensor 23 can quickly sense it. The fiber grating sensor 23 can measure the temperature in the oven 10 more accurately, and the temperature monitoring is more real-time.

[0061] According to some embodiments of this application, please refer to Figure 3The bracket 24 includes a first rod 241 and a second rod 242, the first rod 241 and the second rod 242 are arranged at an angle, one end of the first rod 241 and the second rod 242 intersect at a first node 244 and are connected to the inner wall of the oven 10, and the other end of the first rod 241 and the second rod 242 are connected to the fiber grating sensor 23.

[0062] After one end of the first rod 241 and the second rod 242 meet at the first node 244, the first node 244 is welded and fixed to the inner wall of the oven 10. The other ends of the first rod 241 and the second rod 242 are respectively welded to the fiber grating sensor 23, that is, there are two welding points between the bracket 24 and the fiber grating sensor 23, and the first rod 241, the second rod 242 and the fiber grating sensor 23 form a triangular structure.

[0063] Of course, please refer to Figure 4 The bracket 24 may further include a third rod 243, which is disposed between the first rod 241 and the second rod 242, and is used to connect the first rod 241 and the second rod 242 as a whole. The third rod 243 may be connected to the middle of the first rod 241 and the second rod 242, so that the integrity of the bracket 24 is ensured, and a distance is provided between the third rod 243 and the fiber grating sensor 23, so that the gas can flow smoothly.

[0064] In addition, in addition to the triangular bracket 24, the bracket 24 can also be other brackets 24, such as a telescopic bracket 24. The telescopic bracket 24 is arranged between the fiber grating sensor 23 and the inner wall of the oven 10, and the telescopic bracket 24 can adjust the distance between the fiber grating sensor 23 and the inner wall of the oven 10. Since the fiber grating sensors 23 of each oven 10 are connected in series as a whole through the optical fiber 22, in order to ensure the smoothness and aesthetics of the layout of the optical fiber 22, the fiber grating sensors 23 in the same row in the height direction of each oven 10 should be in the same straight line as much as possible, but the manufacturing error of the bracket 24 and the installation error of the fiber grating sensor 23 are uncontrollable. Therefore, by using the bracket 24 as a telescopic bracket, the fiber grating sensors 23 in each oven 10 can be placed in the same straight line as much as possible by adjusting the length of the bracket 24.

[0065] Please refer to Figure 5The telescopic bracket includes a telescopic rod 25, and the telescopic rod 25 may include a first screw rod 251, a second screw rod 252 and an adjustment cylinder 253. The first screw rod 251 and the second screw rod 252 have external threads with opposite rotation directions, and the adjustment cylinder 253 has internal threads. The first screw rod 251 is welded and fixed to the inner wall of the oven 10. The first screw rod 251 and the second screw rod 252 are arranged at both ends of the adjustment cylinder 253, and the end of the second screw rod 252 away from the adjustment cylinder 253 is welded to the fiber grating sensor 23. By rotating the adjustment cylinder 253, the length of the telescopic rod 25 can be extended and retracted, and the adjustment is convenient. When the grating fiber 22 sensor needs to be replaced, it is only necessary to separate the second screw rod 252 from the adjustment cylinder 253, retain the first screw rod 251, and let the new fiber grating sensor 23 be connected to the second screw rod 252 and then cooperate with the adjustment cylinder 253. The fiber grating sensor 23 is easy to assemble and disassemble. Of course, the telescopic rod 25 can also be other telescopic structures, such as a sleeve structure, which will not be described one by one here.

[0066] The number of the telescopic rod 25 can be one or more. When the number of the telescopic rod 25 is one, one end of the telescopic rod 25 is welded to the inner wall of the oven 10, and the other end of the telescopic rod 25 is welded to the fiber grating sensor 23. By adjusting the length of the telescopic rod 25, the installation position of the fiber grating sensor 23 can be adjusted.

[0067] The bracket 24 includes a first rod 241 and a second rod 242. The first rod 241 and the second rod 242 install the fiber grating sensor 23 to the inner wall of the oven 10. The first rod 241, the second rod 242 and the fiber grating sensor 23 form a triangular structure. The triangular structure has strong stability, which can ensure the installation strength of the fiber grating sensor 23 on the oven 10. At the same time, the space area between the first rod 241 and the second rod 242 can be used for gas to pass through, reducing the obstruction to the gas flow in the area where the fiber grating sensor 23 is located, ensuring the accuracy of temperature monitoring.

[0068] According to some embodiments of this application, please refer to Figure 3 The optical fiber 22 is passed through the fiber grating sensor 23 . The fiber grating sensor 23 has a first side 231 away from the inner wall of the oven 10 . The first side 231 is used to monitor the temperature of the air in the oven 10 .

[0069] Please refer to Figure 3The optical fiber 22 may include a first optical fiber segment 221 located outside the oven 10 and a second optical fiber segment 222 located inside the oven 10. Two optical fiber interfaces 223 are respectively provided at both ends of the first optical fiber segment 221. The two optical fiber interfaces 223 are respectively provided on opposite sides of the oven 10. The second optical fiber segment 222 is located inside the oven 10 and is connected to the two optical fiber interfaces 223 on both sides of the width direction of the oven 10. In other words, the optical fiber interface 223 can realize a detachable connection between the first optical fiber segment 221 and the second optical fiber segment 222. The optical fiber interface 223 can be understood as an optical fiber connector or an optical fiber adapter, which can connect the two optical fibers 22 together permanently or detachably.

[0070] When the fiber grating sensor 23 in the oven 10 is damaged and needs maintenance and replacement, it is only necessary to replace the second optical fiber segment 222 in the oven 10 and the fiber grating sensor 23 on the second optical fiber segment 222, and connect the two ends of the new second optical fiber segment 222 to the optical fiber interfaces 223 on both sides of the oven 10, so that the fiber grating sensor 23 is easy to maintain.

[0071] The optical fiber 22 is passed through the fiber grating sensor 23 , that is, the fiber grating sensor 23 is fixedly passed through the optical fiber 22 , and the first side 231 refers to a side of the fiber grating sensor 23 away from the inner wall of the oven 10 .

[0072] Since the air on the side of the fiber grating sensor 23 close to the inner wall of the oven 10 is easily affected by the temperature of the inner wall of the oven 10, the temperature of the space on the side of the inner wall of the oven 10 cannot accurately reflect the actual temperature of the air in the oven 10. Therefore, by using the first side 231 of the fiber grating sensor 23 away from the inner wall of the oven 10 to monitor the temperature of the gas in the oven 10, the temperature monitored by the fiber grating sensor 23 is more accurate and has higher precision.

[0073] According to some embodiments of the present application, the fiber grating sensor 23 has a second side 232 close to the inner wall of the oven 10 , and the second side 232 is used to monitor the solvent concentration in the oven 10 .

[0074] The solvent concentration refers to the concentration of methylpyrrolidone (NMP, N-Methylpyrrolidone) in the oven 10. When making electrode sheets, NMP is used as a solvent to fuse together various materials required for the electrode, such as binders, positive electrode active materials, and conductive agents, so that the binder is in full contact with other materials and evenly distributed. As a solvent, the quality of NMP directly affects the quality of lithium-ion battery slurry coating, and it is an indispensable solvent material. From the distribution of NMP application fields, it is mainly used in the preparation of lithium batteries, accounting for 74%. In the process of drying the electrode sheets in the oven 10, it is necessary to monitor the solvent concentration in the oven 10, that is, the concentration of NMP, so as to achieve the traceability of the solvent concentration of each section of the oven 10 in the coating process, and provide underlying data for the analysis and optimization of the coating process.

[0075] When the temperature or gas composition of the gas in the oven 10 changes, such as when the solvent concentration changes, the grating sensitive area 235 on the fiber grating sensor 23 will also be strained in the length direction, and the wavelength of the reflected light signal in the optical fiber 22 will change. Of course, the frequency band of the wavelength of the reflected light signal caused by the temperature change is different from the frequency band of the wavelength of the reflected light signal caused by the gas composition change. Therefore, the central control demodulation system can obtain the wavelength of the reflected light in the corresponding frequency band to analyze the temperature change and gas composition change in the oven 10.

[0076] It should be noted that the material and structure of the first side 231 and the second side 232 of the fiber grating sensor 23 are exactly the same. The fiber grating sensor 23 on the same side will be deformed by temperature changes or changes in gas composition. However, the frequency band of the wavelength of the reflected light signal caused by temperature changes is different from the frequency band of the wavelength of the reflected light signal caused by changes in gas composition. Therefore, the temperature change or air composition change on the same side of the fiber grating sensor 23 will not affect the central control demodulation system 21 in obtaining the corresponding wavelength of the reflected light signal. That is to say, the central control demodulation system 21 can selectively obtain the reflected light signal of the corresponding wavelength range according to the setting.

[0077] For example, when the central control demodulation system 21 collects the wavelength of the optical signal of the first side 231 of the corresponding fiber Bragg grating sensor 23, it will only collect the wavelength deformation of the corresponding frequency band caused by temperature change for calculation and analysis, but will not collect the wavelength deformation of the corresponding frequency band caused by the change of gas composition, and automatically filter and ignore the wavelength deformation of the first side 231 of the fiber Bragg grating sensor 23 caused by the gas composition. Similarly, when the central control demodulation system 21 collects the wavelength of the optical signal of the second side 232 of the corresponding fiber Bragg grating sensor 23, it will only obtain the wavelength deformation of the corresponding frequency band caused by the change of gas composition for calculation and analysis, but will not collect the wavelength deformation of the corresponding frequency band caused by temperature change. In other words, temperature changes and gas composition changes will not affect the accuracy of the fiber Bragg grating sensor 23 in measuring temperature or solvent concentration, and the two are independent of each other and do not interfere with each other.

[0078] By placing the fiber grating sensor 23 close to the second side 232 of the inner wall of the oven 10 to monitor the solvent concentration of the cathode and cathode in the oven 10, online monitoring of the solvent concentration of the cathode and cathode can be achieved to ensure the traceability of the drying effect of the coating process.

[0079] According to some embodiments of this application, please refer to Figure 3 Along the height direction of the oven 10 , the oven 10 includes a first wall 11 and a second wall 12 that are relatively distributed, and each of the first wall 11 and the second wall 12 is provided with at least one fiber grating sensor 23 .

[0080] Please refer to Figure 6 The fiber Bragg grating sensor 23 includes an outer package 233, a substrate 234 and a sensitive area 235. The sensitive area 235 is a deformable grating. The substrate 234 is made of polytetrafluoroethylene and plays a role in supporting the sensitive area 235 to ensure that the overall structure of the sensitive area 235 remains stable during repeated deformation. The optical fiber 22 is arranged in the fiber Bragg grating sensor 23, and transmits the modulated optical signal to the optical detector of the central control demodulation system 21. The demodulator of the central control demodulation system 21 demodulates the returned optical signal to realize quantitative monitoring of temperature and gas composition.

[0081] The number of the fiber grating sensors 23 on the first wall 11 and the second wall 12 in the oven 10 may be one or more. In this embodiment, one fiber grating sensor 23 is disposed on each of the first wall 11 and the second wall 12, and the fiber grating sensor 23 monitors the temperature of the top area and the bottom area of ​​the oven 10 and monitors the solvent concentration.

[0082] By arranging at least one fiber grating sensor 23 on the first wall 11 and the second wall 12 of the oven 10, the fiber grating sensor 23 can realize temperature monitoring of the top area and the bottom area of ​​the oven 10 and solvent concentration monitoring, with more monitoring points and a wider monitoring range. The temperature information and solvent concentration value inside the oven 10 obtained by the temperature monitoring unit 20 are more accurate.

[0083] According to some embodiments of the present application, a plurality of ovens 10 are distributed in a rectangular array.

[0084] The distribution direction of the multiple ovens 10 is not limited to one direction. A part of the multiple ovens 10 can be distributed along the length direction, and another part of the ovens 10 can be distributed along the height direction or the width direction. That is to say, the multiple ovens 10 are distributed in multiple rows, and each row of ovens 10 has multiple ovens 10. The distribution is more straight, which is convenient for the distribution of the ovens 10.

[0085] The multiple ovens 10 are distributed in an array. The multiple ovens 10 are distributed in a simple manner, which saves space and has a reasonable spatial layout. It is also convenient for arranging the temperature monitoring unit 20.

[0086] According to some embodiments of the present application, the central control demodulation system 21 is disposed outside the oven 10 .

[0087] The central control demodulation system 21 can receive and demodulate the optical signals transmitted by the multiple fiber grating sensors 23 . One set of central control demodulation system 21 can realize the collection and analysis of the temperature information of multiple ovens 10 .

[0088] The central control demodulation system 21 is arranged outside the oven 10 , independently of the oven 10 , so that the staff can know the temperature of each oven 10 in real time and set relevant parameters of the central control demodulation system 21 .

[0089] The embodiment of the present application further provides a battery manufacturing device, which includes the coating oven device 100 of any of the aforementioned embodiments.

[0090] In some embodiments, please refer to Figures 2 to 6The coating oven device 100 includes a plurality of ovens 10 and a temperature monitoring unit 20, wherein the temperature monitoring unit 20 is used to monitor the temperature information of each oven 10; wherein the temperature monitoring unit 20 includes a central control demodulation system 21, an optical fiber 22 and a plurality of optical fiber grating sensors 23; an optical fiber grating sensor 23 is provided in each oven 10, and the optical fiber 22 is provided in the plurality of ovens 10 so as to sequentially connect the optical fiber grating sensors 23 in the plurality of ovens 10 in series and connect them to the central control demodulation system, and the central control demodulation system 21 is used to demodulate the optical signal transmitted by the optical fiber grating sensor 23 so as to obtain the temperature information of each oven 10. The optical fiber grating sensor 23 is installed on the inner wall of the oven 10 through a bracket 24. The bracket 24 is provided between the optical fiber 22 sensor and the inner wall of the oven 10 so as to allow a gap between the optical fiber grating sensor 23 and the inner wall of the oven 10. The bracket 24 includes a first rod 241 and a second rod 242, which are arranged at an angle. One end of the first rod 241 and the second rod 242 intersect at a first node 244 and are connected to the inner wall of the oven 10, and the other end of the first rod 241 and the second rod 242 are connected to the fiber grating sensor 23.

[0091] Each oven 10 is provided with a fiber grating sensor 23, and the fiber grating sensors 23 in multiple ovens 10 are connected in series using optical fibers 22 to form an optical path network. When the temperature of the air in the oven 10 changes, with air as the medium, the temperature change of the air will cause the fiber grating sensor 23 in the oven 10 to undergo microscopic deformation accordingly, thereby causing the wavelength of the optical signal transmitted by the optical fiber 22 to change. The central control demodulation system 21 calculates the temperature data of the corresponding oven 10 by demodulating the change of the optical signal, thereby obtaining the temperature information of the oven 10. This solution uses a fiber grating sensor 23 to monitor the temperature of the oven 10. The optical fiber 22 is used as the conduction path. The optical signal transmission in the optical fiber 22 is not affected by the electromagnetic environment, and the signal stability is high. In addition, the fiber grating sensor 23 has high sensitivity, which can improve the temperature monitoring accuracy of the oven 10, thereby improving the drying uniformity of the electrode and the consistency of the battery performance.

[0092] The fiber grating sensor 23 is mounted on the inner wall of the oven 10 through the bracket 24. The fiber grating sensor 23 does not directly contact the inner wall of the oven 10, and is not likely to affect the temperature measurement accuracy of the fiber grating sensor 23. The arrangement of the bracket 24 allows a gap between the fiber grating sensor 23 and the inner wall of the oven 10, and the gap allows the gas inside the oven 10 to flow freely, maintaining the fluidity of the inner space of the oven 10. Even if the temperature inside the oven 10 changes, the fiber grating sensor 23 can quickly sense it, and the fiber grating sensor 23 can measure the temperature inside the oven 10 more accurately, and the temperature monitoring is more real-time. The first rod 241 and the second rod 242 install the fiber grating sensor 23 to the inner wall of the oven 10. The first rod 241, the second rod 242 and the fiber grating sensor 23 form a triangular structure. The triangular structure has strong stability, which can ensure the installation strength of the fiber grating sensor 23 on the oven 10. At the same time, the space area between the first rod 241 and the second rod 242 can be used for gas to pass through, reducing the obstruction to the gas flow in the area where the fiber grating sensor 23 is located, ensuring the accuracy of temperature monitoring.

[0093] In some embodiments, the optical fiber 22 is passed through the fiber grating sensor 23, and the fiber grating sensor 23 has a first side 231 away from the inner wall of the oven 10, and the first side 231 is used to monitor the temperature of the air in the oven 10. The fiber grating sensor 23 has a second side 232 close to the inner wall of the oven 10, and the second side 232 is used to monitor the solvent concentration in the oven 10. Along the height direction of the oven 10, the oven 10 includes a first wall 11 and a second wall 12 that are relatively distributed, and each of the first wall 11 and the second wall 12 is provided with a fiber grating sensor 23. The multiple ovens 10 are distributed in a rectangular array, and the central control demodulation system 21 is arranged outside the oven 10.

[0094] Since the air on the side of the fiber grating sensor 23 close to the inner wall of the oven 10 is easily affected by the temperature of the inner wall of the oven 10, the temperature of the space on the side of the inner wall of the oven 10 cannot accurately reflect the actual temperature of the air in the oven 10. Therefore, by using the first side 231 of the fiber grating sensor 23 away from the inner wall of the oven 10 to monitor the temperature of the gas in the oven 10, the temperature monitored by the fiber grating sensor 23 is more accurate and has higher precision. By using the second side 232 of the fiber grating sensor 23 close to the inner wall of the oven 10 to monitor the solvent concentration of the cathode and cathode in the oven 10, the online monitoring of the concentration of the cathode and cathode solvents can be achieved to ensure the traceability of the drying effect of the coating process. By providing a fiber grating sensor 23 on both the first wall 11 and the second wall 12 of the oven 10, the fiber grating sensor 23 can realize the temperature monitoring and solvent concentration monitoring of the top area and the bottom area of ​​the oven 10, with more monitoring points and a wider monitoring range, and the temperature information and solvent concentration value inside the oven 10 obtained by the temperature monitoring unit 20 are more accurate. The central control demodulation system 21 is arranged outside the oven 10 , independently of the oven 10 , so that the staff can know the temperature of each oven 10 in real time and set relevant parameters of the central control demodulation system 21 .

[0095] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating oven device, characterized in that: include: Multiple ovens; A temperature monitoring unit, used to monitor the temperature information of each of the ovens; Wherein, the temperature monitoring unit includes a central control demodulation system, an optical fiber and a fiber grating sensor; the fiber grating sensor is arranged in each of the ovens, and the optical fiber is passed through multiple ovens to connect the fiber grating sensors in multiple ovens in series in sequence and connect them to the central control demodulation system; the central control demodulation system is used to demodulate the optical signal transmitted by the fiber grating sensor to obtain the temperature information of each oven.

2. The coating oven device according to claim 1, characterized in that: The fiber grating sensor is installed on the inner wall of the oven through a bracket.

3. The coating oven device according to claim 2, characterized in that: The bracket is arranged between the optical fiber sensor and the inner wall of the oven, so that there is a gap between the optical fiber grating sensor and the inner wall of the oven.

4. The coating oven device according to claim 3, characterized in that: The bracket includes a first rod and a second rod, the first rod and the second rod are arranged at an angle, one end of the first rod and the second rod meet at a first node and are connected to the inner wall of the oven, and the other end of the first rod and the second rod are connected to the fiber grating sensor.

5. The coating oven device according to claim 1, characterized in that: The optical fiber is passed through the fiber grating sensor. The fiber grating sensor has a first side away from the inner wall of the oven. The first side is used to monitor the temperature of the air in the oven.

6. The coating oven device according to claim 1, characterized in that: The fiber grating sensor has a second side close to the inner wall of the oven, and the second side is used to monitor the solvent concentration in the oven.

7. The coating oven device according to claim 1, characterized in that: Along the height direction of the oven, the oven comprises a first wall and a second wall that are oppositely distributed, and each of the first wall and the second wall is provided with at least one fiber grating sensor.

8. The coating oven device according to claim 1, characterized in that: The plurality of ovens are distributed in a rectangular array.

9. The coating oven device according to claim 1, characterized in that: The central control demodulation system is arranged outside the oven.

10. A battery manufacturing device, characterized in that: The coating oven device comprises the coating oven device according to any one of claims 1 to 9.

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