CN112756217A - Coating detection method, coating control method and detection system for fuel cell - Google Patents
Coating detection method, coating control method and detection system for fuel cell Download PDFInfo
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- CN112756217A CN112756217A CN202110012869.8A CN202110012869A CN112756217A CN 112756217 A CN112756217 A CN 112756217A CN 202110012869 A CN202110012869 A CN 202110012869A CN 112756217 A CN112756217 A CN 112756217A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1005—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern
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Abstract
The invention provides a fuel cell coating detection method, a coating control method and a detection system, wherein the fuel cell coating detection method comprises the following steps: applying the slurry to a substrate, the slurry forming a coating on the substrate; the base material drives the dried coating to move along the front-back direction; the coating is detected by an X-ray detector, the X-ray moving device drives the X-ray detector to reciprocate along the left-right direction, the X-ray detector moves from the leftmost position to the rightmost position in the right direction and returns to the leftmost position, the coating is detected for multiple times, so that the actual surface density of the active substances at multiple measuring points of the coating is respectively obtained, and the measuring points corresponding to at least two times of detection are distributed at intervals along the left-right direction. The detection method can detect the migration and distribution conditions of the active substances in the coating more comprehensively and more accurately.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a coating detection method, a coating control method and a detection system for a fuel cell.
Background
The thickness of the battery coating is measured from the initial mechanical contact measurement to the current non-contact measurement of a laser thickness gauge, but the thickness of the whole coating is actually a mixture, the traditional thickness measurement is to estimate the surface density of the active substance based on the assumption that the active substance is evenly distributed after the thickness is measured, the migration and the distribution of the active substance in the drying process cannot be estimated, and the distribution condition of the active substance in the dried coating cannot be detected. The weight deviation of the coating at present is generally higher than a plus or minus 6 percent level, except that the density and the viscosity of the slurry are changed due to the reasons of gravity or agglomeration and sedimentation, solvent loss and the like in the process of storage and transportation of the slurry, and the actual flow is changed due to pipeline resistance or air bubbles and the like, so that the coating stability is influenced; also, the detection error of our detection method itself affects the stability of the coating. Therefore, how to accurately detect the content and distribution of the active material in the coating layer becomes an important research topic for coating the fuel cell.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a method for detecting the coating of a fuel cell, which can more accurately detect the distribution of an active material in a coating.
In order to achieve the above object, the present invention provides a method for detecting coating of a fuel cell, comprising the steps of:
coating the slurry on a base material, forming a coating on the base material by the slurry, and drying the coating on the base material;
the base material drives the dried coating to move along the front-back direction;
the X-ray detector is used for detecting the moving coating, and simultaneously, the X-ray moving device drives the X-ray detector to reciprocate along the left and right directions,
the X-ray detector moves from the leftmost position to the rightmost position in the rightward direction and returns to the leftmost position, the coating is detected for multiple times to respectively obtain the actual surface density of the active substance at multiple measuring points of the coating, and the measuring points corresponding to at least two times of detection are distributed at intervals in the leftward and rightward directions.
Further, when the X-ray detector is positioned at the leftmost position, the coating is detected once; when the X-ray detector is in the rightmost position, one pass of the coating is performed.
Further, the moving direction of the X-ray detector is perpendicular to the moving direction of the substrate.
As described above, the fuel cell coating detection method according to the present invention has the following advantageous effects:
the coating detection method of the fuel cell utilizes an X-ray moving device to drive an X-ray detector to move back and forth along the left-right direction, detects the coating moving along the front-back direction, detects the coating for many times in the process that the X-ray detector moves from the leftmost position to the rightmost position and returns to the leftmost position to respectively obtain the actual surface density of the active substance at a plurality of measuring points of the coating, and at least two times of detection correspond to the measuring points which are distributed at intervals along the left-right direction, namely the X-ray detector detects different positions of the coating along the left-right direction at least two times in the process of one back and forth movement, the detection method is more comprehensive, can detect the migration and distribution conditions of the active substance along the left-right direction, and combines the X-ray detector to detect the coating moving along the front-back direction, therefore, the migration and distribution conditions of the active substances in the front and back directions can be detected, the migration and distribution conditions of the active substances in the coating can be detected more comprehensively and accurately by the detection method, and the content of the active substances in the coating can be detected more accurately.
Another object of the present invention is to provide a coating control method capable of improving coating quality.
In order to achieve the above object, the present invention provides a coating control method, including the fuel cell coating detection method, and coating a slurry onto a substrate using a coater during a coating process; the coating control method further comprises the following steps:
the X-ray detector feeds back a detection result to the PLC control system, the PLC control system compares the obtained actual surface density with a set target range, and if the obtained actual surface density exceeds the set target range, the PLC control system regulates and controls the working state of the coating machine so as to regulate the slurry flow at the outlet of the coating machine until the obtained actual surface density reaches the set target range.
Further, the process of regulating the working state of the coating machine by the PLC control system comprises the following steps:
the PLC control system is according to the mathematical model relational expression: s ═ a (K)0*W+K1)*N*ρ*10]a/BV, wherein S is a set target value of the area density of the active material, a is a flow coefficient, W is a set target rotation speed of a screw pump of the coating machine, K0Is the compensation coefficient of screw pump, K1Calculating a set target rotating speed W of the screw pump for a correction coefficient of the slurry, wherein N is the solid content of the slurry, rho is the density of the slurry, B is the coating width, and V is the coating speed;
and the PLC control system controls the actual rotating speed of the screw pump to reach the set target rotating speed W.
Further, if the plurality of continuously acquired actual surface densities exceed the set target range, the PLC control system sends a regulation and control instruction to the coating machine so as to regulate the flow rate of the slurry at the outlet of the coating machine.
As described above, the coating control method according to the present invention has the following advantageous effects:
the coating control method realizes the detection of the surface density of the active substance in the coating by the fuel cell coating detection method, compares the obtained actual surface density with the set target range by the PLC control system, and regulates and controls the working state of the coating machine if the obtained actual surface density exceeds the set target range so as to adjust the slurry flow at the outlet of the coating machine until the obtained actual surface density reaches the set target range, and the coating control method can more comprehensively and more accurately detect the migration and distribution condition of the active substance in the coating and accurately detect the condition that the surface density of the active substance exceeds the set target range based on the fuel cell coating detection method, thereby ensuring that the control method can accurately adjust the slurry flow at the outlet of the coating machine so as to ensure the content of the active substance in the formed coating to be stable, and can better meet the design requirements, so that the coating quality is higher.
Another object of the present invention is to provide a detection system that can more accurately detect the distribution of an active material in a coating.
In order to achieve the above object, the present invention provides a detection system for implementing the fuel cell coating detection method, comprising an X-ray detector and an X-ray moving device, wherein the X-ray detector is mounted on the X-ray moving device, and the X-ray moving device can drive the X-ray detector to move back and forth along the left and right directions.
Further, the X-ray moving device adopts a servo module.
Furthermore, the detection system also comprises a detection rack, the X-ray moving device is arranged on the detection rack, a positioning roller is also arranged on the detection rack, and a detection channel is arranged between the positioning roller and the X-ray detector.
Furthermore, the number of the positioning rollers is two, the two positioning rollers are distributed at intervals along the front-back direction, and the X-ray detector is located between the two positioning rollers in the front-back direction.
As described above, the detection system according to the present invention has the following advantageous effects:
the detection system is based on the fuel cell coating detection method, realizes the detection of the content of the active substances in the coating, and can detect the migration and distribution conditions of the active substances in the coating more comprehensively and accurately.
Drawings
FIG. 1 is a perspective view of a detection system in an embodiment of the invention.
FIG. 2 is a front view of a detection system in an embodiment of the present invention.
FIG. 3 is a left side view of a detection system in an embodiment of the invention.
FIG. 4 is a bottom view of a detection system in an embodiment of the invention.
Fig. 5 is a linear flow chart of the screw pump in the embodiment of the present invention.
FIG. 6 is a schematic view of the position of a measurement point on a coating in an embodiment of the present invention.
FIG. 7 is a graph of weight distribution data for catalysts in examples of the present invention.
Description of the element reference numerals
1 base material
2X-ray detector
21X-ray generator
22 Detector
3X-ray moving device
4 measuring points
5 detecting rack
6 positioning roller
7 detection channel
8 display
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention unless otherwise specified.
Example one
As shown in fig. 1 to 4 and fig. 6, the present embodiment provides a method for detecting a coating of a fuel cell, including the following steps:
coating the slurry on the base material 1 to form a coating on the base material 1, and drying the coating on the base material 1;
the substrate 1 drives the dried coating to move along the front-back direction;
the X-ray detector 2 is used for detecting the coating in motion, meanwhile, the X-ray moving device 3 drives the X-ray detector 2 to move back and forth along the left and right directions,
the X-ray detector 2 moves from the leftmost position to the rightmost position in the rightward direction and then returns to the leftmost position, the coating is detected for multiple times to respectively obtain the actual surface density of the active substance at the multiple measuring points 4 of the coating, and the measuring points 4 corresponding to at least two times of detection are distributed at intervals in the leftward and rightward direction.
The coating detection method of the fuel cell utilizes an X-ray moving device 3 to drive an X-ray detector 2 to move back and forth along the left-right direction, and detects the coating moving along the front-back direction, the X-ray detector 2 moves from the leftmost position to the rightmost position and returns to the leftmost position, the coating is detected for a plurality of times to respectively obtain the actual surface density of the active substance at a plurality of measuring points 4 of the coating, and at least two times of detection are distributed along the left-right direction at intervals, namely, at least two times of detection of the X-ray detector 2 are carried out to detect different positions of the coating along the left-right direction in the process of one back and forth movement, the detection method is more comprehensive, the migration and distribution conditions of the active substance along the left-right direction can be detected, the coating moving along the front-back direction is detected by combining the X-ray detector 2, therefore, the migration and distribution conditions of the active substances in the front and back directions can be detected, the migration and distribution conditions of the active substances in the coating can be detected more comprehensively and accurately by the detection method, and the content of the active substances in the coating can be detected more accurately.
In the present embodiment, the process of moving the X-ray detector 2 from the leftmost position to the rightmost position in the rightward direction refers to a process of moving the X-ray detector 2 from the leftmost position to the rightmost position in the rightward direction, and the process does not include a state where the X-ray detector 2 is located at the leftmost position. Meanwhile, the leftmost position refers to the extreme position of the left side edge of the X-ray detector 2 during the reciprocating movement, and the rightmost position refers to the extreme position of the right side edge of the X-ray detector 2 during the reciprocating movement.
In this embodiment, when the X-ray detector 2 is located at the leftmost position, the coating is detected once; when the X-ray detector 2 is in the rightmost position, one detection of the coating is performed. Meanwhile, the moving direction of the X-ray detector 2 in this embodiment is perpendicular to the moving direction of the substrate 1. The detection mode can realize more comprehensive detection of the coating. Specifically, the X-ray detector 2 will perform 4 detections of the coating while moving from the leftmost position to the rightmost position and then returning to the leftmost position. In the embodiment, the coating is detected by the X-ray detector 2, and the distribution of the corresponding measuring points 4 on the coating is shown in fig. 6.
The embodiment also provides a coating control method, which comprises a fuel cell coating detection method, wherein the slurry is coated on the substrate 1 by using a coating machine in the coating process; the coating control method further comprises the following steps:
the X-ray detector 2 feeds back the detection result to the PLC control system, the PLC control system compares the obtained actual surface density with a set target range, and if the obtained actual surface density exceeds the set target range, the PLC control system regulates and controls the working state of the coating machine so as to regulate the slurry flow at the outlet of the coating machine until the obtained actual surface density reaches the set target range.
The coating control method realizes the detection of the surface density of the active substance in the coating by the fuel cell coating detection method, compares the obtained actual surface density with the set target range by the PLC control system, and regulates and controls the working state of the coating machine if the obtained actual surface density exceeds the set target range so as to adjust the slurry flow at the outlet of the coating machine until the obtained actual surface density reaches the set target range, and the coating control method can more comprehensively and more accurately detect the migration and distribution condition of the active substance in the coating and accurately detect the condition that the surface density of the active substance exceeds the set target range based on the fuel cell coating detection method, thereby ensuring that the control method can accurately adjust the slurry flow at the outlet of the coating machine so as to ensure the content of the active substance in the formed coating to be stable, and can better meet the design requirements, so that the coating quality is higher.
In this embodiment, the process of regulating the working state of the coater by the PLC control system includes the following steps:
the PLC control system is according to the mathematical model relational expression: s ═ a (K)0*W+K1)*N*ρ*10]a/BV, wherein S is a set target value of the area density of the active material, a is a flow coefficient, W is a set target rotation speed of a screw pump of the coating machine, K0Is the compensation coefficient of screw pump, K1Calculating a set target rotating speed W of the screw pump for a correction coefficient of the slurry, wherein N is the solid content of the slurry, rho is the density of the slurry, B is the coating width, and V is the coating speed;
and the PLC control system controls the actual rotating speed of the screw pump to reach the set target rotating speed W.
In the embodiment, the PLC control system regulates and controls the actual rotating speed of the screw pump to reach the set target rotating speed W according to the mathematical model relation, so that the flow of the slurry at the outlet of the coating machine can be accurately and quickly regulated to reach the set flow, the content of the active substance in the coating formed by coating can be accurately and quickly regulated to meet the set requirement, and the coating quality is higher.
In the detection method of the present embodiment, when the coating is detected by the X-ray detector 2, 3 measurement points 4 are provided in the lateral direction, that is, in the left-right direction. In this embodiment, if the actual areal densities continuously obtained by the PLC control system all exceed the set target range, the PLC control system sends a control instruction to the coating machine to adjust the coating machineSlurry flow at the machine outlet. Specifically, if the PLC control system continuously obtains that 3 actual areal densities detected by the X-ray detector 2 exceed the set target range, the operating state of the coating machine is regulated according to the mathematical model relational expression to adjust the flow rate of the slurry at the outlet of the coating machine, then the slurry is coated on the substrate 1 through the outlet of the coating machine, and then after drying by the oven, the coating is continuously quantitatively detected by the X-ray detector 2, and the number of the transverse measurement points 4 is set to 3, until the measured actual areal densities reach the set target range, the PLC control system stops adjusting the rotation speed of the screw pump. For example, in the present embodiment, the target range is set to 200. mu. + -20 g/cm2Continuously measuring 3 areal density values which are all lower than the lower limit or all exceed the upper limit, for example, 3 measured values are respectively 170g/cm2、175g/cm2、165g/cm2Or 3 measurements are 225g/cm each2、230g/cm2、228g/cm2And the PLC control system can adjust the working state of the coating machine until the obtained actual areal density reaches the set target range.
Meanwhile, as shown in fig. 1 to 4, the embodiment further provides a detection system for implementing the coating detection method for the fuel cell, which includes an X-ray detector 2 and an X-ray moving device 3, wherein the X-ray detector 2 is mounted on the X-ray moving device 3, and the X-ray moving device 3 can drive the X-ray detector 2 to reciprocate along the left-right direction. The detection system is based on the fuel cell coating detection method, realizes the detection of the content of the active substances in the coating, and can detect the migration and distribution conditions of the active substances in the coating more comprehensively and accurately.
In this embodiment, the X-ray moving device 3 employs a servo module to drive the X-ray detector 2 to move back and forth stably in the left-right direction, thereby ensuring that the X-ray detector 2 can accurately detect the surface density of the active material at the corresponding position of the coating.
As shown in fig. 1 to 4, the detection system in this embodiment further includes a detection rack 5, the X-ray moving device 3 is mounted on the detection rack 5, and a positioning roller 6 is further mounted on the detection rack 5, and a detection channel 7 is provided between the positioning roller 6 and the X-ray detector 2. When the coating is detected, the substrate 1 with the coating passes through the detection channel 7, and the side, which is not provided with the coating, of the substrate 1 is in contact with the positioning roller 6, so that the coating in the detection channel 7 is detected by the X-ray detector 2. In the embodiment, the substrate 1 and the coating are positioned by utilizing the contact action of the positioning roller 6 and the substrate 1, so that the distance between the X-ray detector 2 and the part to be detected of the coating can accurately meet the set requirement, and the part to be detected of the coating can be accurately detected. Meanwhile, in the present embodiment, there are two positioning rollers 6, the two positioning rollers 6 are spaced apart in the front-rear direction, and the X-ray detector 2 is located between the two positioning rollers 6 in the front-rear direction. The central axes of the two positioning rollers 6 are parallel to each other, and the heights of the two positioning rollers 6 are the same, so that the heights of the parts, which are in contact with the two positioning rollers 6, on the substrate 1 are the same, and the parts are in a horizontal state when the corresponding parts of the coating are detected by the X-ray detector 2, and the detection accuracy is higher. In addition, the positioning roller 6 is located above the X-ray detector 2 and the X-ray moving device 3 in this embodiment. In this embodiment, the X-ray detector 2 is in communication connection with the PLC control system. The PLC control system is in communication connection with the coating machine and can control the rotating speed of a screw pump of the coating machine.
The detection method in the embodiment is specifically an on-line detection method, the detection method is used for carrying out on-line detection on the dried coating while coating, and obtaining the surface density of the active substance in the coating, and during detection, the X-ray moving device 3 is used for driving the X-ray detector 2 to reciprocate along the left-right direction and detecting the coating moving along the front-back direction, the detection method can not only obtain the migration and distribution conditions of the active substance along the length direction, namely the front-back direction, of the coating, but also obtain the migration and distribution conditions of the active substance along the width direction, namely the left-right direction, of the coating, so that the condition that the surface density of the active substance in the coating exceeds a set range can be timely and accurately detected, the coating control method can timely and accurately regulate the working state of a coating machine, and the surface density of the active substance in the coating can better meet the set requirement, and ensures a higher quality of the coating formed.
The active material in this example specifically refers to a catalyst in a fuel cell. The detection method, the coating control method and the detection system in the embodiment are particularly applied to the technical field of fuel cells, and realize online detection of the catalyst in the coating. The coating detection method for the fuel cell in the embodiment can quickly and accurately detect the content and the distribution condition of the active substances in the coating, so that the coating control method can accurately control the content of the active substances in the coating formed by coating, and the formed coating has higher quality.
In the coating detection method and the coating control method for the fuel cell in the embodiment, the content of the catalyst is detected by the detection system, and then a mathematical model is established by combining the data processing and control system and the flow meter measured flow at the outlet of the screw pump to perform closed-loop control. In the embodiment, rho in the mathematical model relation is specifically the actually measured density of the slurry; b is the width of the coating along the left and right direction, and the unit is m; a is also called flow loss coefficient of the screw pump, and has no unit; the unit of S is mg/cm3(ii) a The unit of W is rpm/min; the unit of N is%; the unit of V is m; k1The unit of (a) is g/rpm; k0The unit of (b) is g/min.
The mathematical model between the rotating speed of the screw pump and the slurry flow at the outlet of the screw pump in the embodiment is as follows: q ═ K0*W+K1Wherein Q is the flow rate of the slurry at the outlet of the screw pump, and the unit is g/min, and can be obtained by measuring the flow rate at the outlet of the screw pump through a flowmeter, K1And K0It is obtained by taking multiple measurements with a flow meter located at the output of the screw pump and then fitting linearly, as shown in figure 5. The actual flow at the outlet of the coating machine and the flow at the outlet of the screw pump are in a direct proportion, and the specific relation is as follows: q1＝a*Q，Q1The flow coefficient a is an empirical value which needs to be calibrated through a plurality of experiments, and is mainly related to the height difference and the distance between the outlet of the screw pump and the outlet of the coating machine.
The detection system in this embodiment further includes a radiation protection device. The present detection system may be adapted for use with substrates 1 of a variety of different materials. The moving stroke of the X-ray moving device 3 in this embodiment is larger than the coating width B. The detection system in the embodiment further comprises a control cabinet arranged on the detection rack 5, the detection rack 5 is provided with a bearing structure, and the control cabinet is used for storing electric elements and an industrial personal computer. The industrial personal computer comprises a light splitting detection system and a data recording processing system, and calculates and outputs a judgment result. The industrial control computer comprises a display 8. The X-ray detector 2 in this embodiment includes an X-ray generator 21 and a detector 22, the X-ray generator 21 generating incident X-rays, also called primary X-rays, to excite a test sample; the detector 22 measures the energy and quantity of the secondary X-rays. The coating is in this embodiment specifically located on the lower surface of the substrate 1. The X-ray detector 2 detects the coating platinum loading by X-ray. The PLC control system in the embodiment comprises a data processing and controlling unit, the data processing and controlling unit can classify data according to the position and the measuring time of the measuring point 4, can set an upper limit and a lower limit, and can automatically control the output of the screw pump.
The coating control method in this embodiment further includes the steps of:
inputting a set target value S of the surface density of the active material and matched parameters including a coating width B, a coating speed V, a slurry solid content N, a slurry density rho and a fitted K into a PLC control system1And K0The flow coefficient a.
In this embodiment, when the actual surface density value of the catalyst is continuously three or more than three values beyond the set target range during coating, the PLC control system automatically adjusts the rotation speed of the screw pump until the actual surface density value of the catalyst reaches the set target range. In the detection method and the coating control method of the embodiment, the amount of the coating catalyst is detected on line and accurately controlled by using an X-ray and a control system.
The fuel cell coating detection method in the embodiment can perform full coverage detection on the catalyst content in coating quickly, accurately and nondestructively, reduce measurement errors, and use a closed-loop control system to ensure that the coating catalyst amount is stable, the coating catalyst amount can better reach a design value, the coating fluctuation range of the catalyst is smaller, and the process capability index CPK is larger than 1.67, as shown in FIG. 7.
Example two
The present embodiment is different from the first embodiment in that the number of the lateral measuring points 4 is increased to 5 when the coating is detected by the X-ray detector 2 in the present embodiment. In addition, the number of lateral measurement points 4 can also be adjusted according to the coating width in other embodiments.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A fuel cell coating detection method is characterized by comprising the following steps:
coating the slurry on the base material (1), forming a coating on the base material (1) by the slurry, and drying the coating on the base material (1);
the base material (1) drives the dried coating to move along the front-back direction;
the X-ray detector (2) is used for detecting the coating in motion, meanwhile, the X-ray moving device (3) drives the X-ray detector (2) to reciprocate along the left and right directions,
the X-ray detector (2) moves from the leftmost position to the rightmost position in the rightward direction and then returns to the leftmost position, the coating is detected for multiple times to respectively obtain the actual surface density of the active substances at the multiple measuring points (4) of the coating, and the measuring points (4) corresponding to at least two times of detection are distributed at intervals in the leftward and rightward direction.
2. The fuel cell coating detection method according to claim 1, wherein the coating is detected once when the X-ray detector (2) is located at the leftmost position; when the X-ray detector (2) is positioned at the rightmost position, the coating is detected once.
3. The fuel cell coating detection method according to claim 1, wherein the moving direction of the X-ray detector (2) is perpendicular to the moving direction of the substrate (1).
4. A coating control method, characterized by comprising the fuel cell coating detection method according to claim 1, and coating the slurry onto a substrate (1) with a coater during the coating process; the coating control method further comprises the following steps:
and the X-ray detector (2) feeds back the detection result to the PLC control system, the PLC control system compares the obtained actual surface density with a set target range, and if the obtained actual surface density exceeds the set target range, the PLC control system regulates and controls the working state of the coating machine so as to regulate the slurry flow at the outlet of the coating machine until the obtained actual surface density reaches the set target range.
5. The coating control method according to claim 4, wherein the process of controlling the working state of the coating machine by the PLC control system comprises the following steps:
the PLC control system is according to the mathematical model relational expression: s ═ a (K)0*W+K1)*N*ρ*10]a/BV, wherein S is a set target value of the area density of the active material, a is a flow coefficient, W is a set target rotation speed of a screw pump of the coating machine, K0Is the compensation coefficient of screw pump, K1Calculating a set target rotating speed W of the screw pump for a correction coefficient of the slurry, wherein N is the solid content of the slurry, rho is the density of the slurry, B is the coating width, and V is the coating speed;
and the PLC control system controls the actual rotating speed of the screw pump to reach the set target rotating speed W.
6. The coating control method according to claim 4, wherein if the plurality of continuously obtained actual areal densities exceed the set target range, the PLC control system sends a control instruction to the coating machine to adjust the flow rate of the slurry at the outlet of the coating machine.
7. A detection system for implementing the fuel cell coating detection method according to claim 1, comprising an X-ray detector (2) and an X-ray moving device (3), wherein the X-ray detector (2) is mounted on the X-ray moving device (3), and the X-ray moving device (3) can drive the X-ray detector (2) to reciprocate in the left-right direction.
8. The detection system according to claim 7, characterized in that the X-ray moving means (3) employs servo modules.
9. The detection system according to claim 7, further comprising a detection rack (5), wherein the X-ray moving device (3) is mounted on the detection rack (5), and a positioning roller (6) is further mounted on the detection rack (5), and a detection channel (7) is arranged between the positioning roller (6) and the X-ray detector (2).
10. The detection system according to claim 9, wherein there are two positioning rollers (6), the two positioning rollers (6) are spaced apart in the front-rear direction, and the X-ray detector (2) is located between the two positioning rollers (6) in the front-rear direction.
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| CN202110012869.8A CN112756217A (en) | 2021-01-06 | 2021-01-06 | Coating detection method, coating control method and detection system for fuel cell |
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| CN114405761A (en) * | 2022-01-27 | 2022-04-29 | 厦门特盈自动化科技有限公司 | Automatic dispensing control method, device and equipment of dispenser |
| CN114720324A (en) * | 2022-06-01 | 2022-07-08 | 浙江双元科技股份有限公司 | Method, device and system for detecting net coating amount of lithium battery pole piece |
| CN115722418A (en) * | 2021-08-31 | 2023-03-03 | 宁德时代新能源科技股份有限公司 | Coating quality detection method and system |
| CN117548302A (en) * | 2024-01-11 | 2024-02-13 | 未势能源科技有限公司 | Fuel cell special-shaped coating preparation method and device, coating device and storage medium |
| WO2024103240A1 (en) * | 2022-11-15 | 2024-05-23 | 宁德时代新能源科技股份有限公司 | Pole piece quality test method and apparatus, coating method and apparatus, and device, system and medium |
| CN118392715A (en) * | 2024-06-28 | 2024-07-26 | 南京华视智能科技股份有限公司 | Lithium battery pole piece dry-method coating surface density detection method and detection system |
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| CN115722418A (en) * | 2021-08-31 | 2023-03-03 | 宁德时代新能源科技股份有限公司 | Coating quality detection method and system |
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| CN118392715A (en) * | 2024-06-28 | 2024-07-26 | 南京华视智能科技股份有限公司 | Lithium battery pole piece dry-method coating surface density detection method and detection system |
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Application publication date: 20210507 |