CN111208136B - Method and device for on-line checking orientation of coating diaphragm - Google Patents
Method and device for on-line checking orientation of coating diaphragm Download PDFInfo
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- CN111208136B CN111208136B CN202010047769.4A CN202010047769A CN111208136B CN 111208136 B CN111208136 B CN 111208136B CN 202010047769 A CN202010047769 A CN 202010047769A CN 111208136 B CN111208136 B CN 111208136B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/8422—Investigating thin films, e.g. matrix isolation method
- G01N2021/8427—Coatings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for checking the orientation of a coating diaphragm on line, compared with the prior art, the method for judging the orientation of the coating diaphragm provided by the invention judges whether the orientation of the coating diaphragm is correct or not through the scribing test of a coating test pen by utilizing the difference of the surface tension of two surfaces of the coating, compares the orientation condition obtained by actual judgment with the correct orientation set in a PLC console after a certain time, and indicates that the orientation is correct if the judged actual orientation is consistent with the set correct orientation; if the actual orientation determined does not match the set correct orientation, the orientation is abnormal, and the operator should be prompted to switch the orientation of the diaphragm. The problem that the diaphragm can not be ensured to face 100% correctly at present is solved, and real-time inspection and feedback can be realized for subsequent tracing. In addition, the invention also provides a device for checking the orientation of the coating diaphragm on line.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a method and a device for detecting the orientation of a coating diaphragm on line.
Background
The lithium ion battery consists of a positive plate, a negative plate, a diaphragm, a tab, electrolyte and an outer package, wherein the diaphragm is mainly used for separating the positive plate from the negative plate so as to block electrons and allow lithium ions to migrate. In order to improve the hardness of the battery cell, prevent the battery cell from deforming during the circulation process, and increase the safety performance of the battery cell, it is necessary to perform a surface treatment on the separator, which is usually to add a functional coating to the separator, such as: ceramic coatings, PVDF coatings, etc. Currently, the membranes of the lithium battery industry can be divided into four categories according to the coating: uncoated diaphragms, single-sided coated diaphragms, double-sided same-coated diaphragms and double-sided different-coated diaphragms; the non-coated diaphragm and the diaphragm with the same coating on the double surfaces do not have the orientation problem, but the diaphragm with the coating on the single surface and the diaphragm with the different coating on the double surfaces have inconsistent two surfaces due to the addition of the functional coating; the influence of the orientation of the membrane on the performance of the cell is great during the use of the coated membrane.
Generally, the coating face should be facing the positive electrode, i.e. facing the positive electrode; such as: when the single-sided PVDF membrane is used, the membrane coating surface needs to be opposite to the positive plate, so that the membrane and the pole plate can be well bonded; if the coating surface of the diaphragm corresponds to the negative electrode, the diaphragm and the pole piece are not adhered, the hardness of the battery cell is reduced, and even the battery cell is seriously deformed. It is therefore important whether the coating face is oriented correctly or not.
At present, when the coated membrane is used in the industry, the orientation of the coated membrane is mainly determined in a mode that staff experience identifies the appearance of the coated membrane, but the method has the following defects:
1. the orientation of the coating diaphragm is subjectively judged by staff, and is influenced by staff experience and responsibility, and when the staff experience is insufficient or the responsibility is not strong, the missed judgment or the wrong judgment can be caused;
2. the diaphragm is partially coated, the appearance difference of two surfaces is extremely small, the diaphragm is difficult to identify by naked eyes, misjudgment is easily caused, and 100% of correct identification cannot be guaranteed;
3. through subjective judgment of staff, accurate data information cannot be formed, and traceability cannot be achieved;
4. when the staff misjudges, the staff is not easy to perceive, the large-batch production of bad batteries can be caused, the raw materials are seriously wasted, and the production cost is improved.
In view of the above, it is necessary to provide a technical solution to solve the above problems.
Disclosure of Invention
One of the objects of the present invention is: by providing the method for checking the orientation of the coating diaphragm on line, the problem that the orientation of the coating diaphragm cannot be guaranteed to be correct by 100% at present is solved, and by the method, the orientation of the coating diaphragm is guaranteed to be correct, real-time checking and feedback can be realized, and accurate data records are formed for subsequent tracing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of on-line checking the orientation of a coated membrane comprising the steps of:
s1, selecting a proper coating test pen according to the difference of surface tension of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen is c, one surface of the coating diaphragm is taken as an A surface, the surface tension value of the A surface is a, the other surface of the coating diaphragm is taken as a B surface, and the surface tension value of the B surface is B, wherein a is more than c and more than B;
s2, firstly, marking a line on one surface of the coating diaphragm by using the coating test pen, taking a picture by using a CCD imaging mechanism after 1-10S, judging the condition of the line segment by using a PLC (programmable logic controller) console, and presetting the correct orientation of the coating diaphragm in the PLC console, wherein if the judged actual orientation is consistent with the set correct orientation, the correct orientation is indicated; if the determined actual orientation does not match the set correct orientation, the orientation is abnormal.
The method for judging the orientation of the coating diaphragm provided by the invention judges whether the orientation of the surface is correct or not through the scribing test of the coating test pen by utilizing the difference of the surface tension of the two surfaces of the coating so as to finish the inspection of the orientation of the coating diaphragm. Firstly, selecting a proper coating test pen, wherein the surface tension value which can be detected by the coating test pen is between the surface tension values of two surfaces of the diaphragm, namely, a > c > b is satisfied; then, the coating test pen is used for scribing on the coating diaphragm, after a certain time, the CCD imaging mechanism is used for photographing to judge the condition of the line segment, the line segment is compared with the correct direction set in the PLC console, and if the judged actual direction is consistent with the set correct direction, the direction is correct; if the determined actual orientation does not match the set correct orientation, the orientation is abnormal, and the operator should be prompted to change the orientation of the diaphragm.
Preferably, in the step S2, the coating separator is set to have a correct orientation such that the surface a faces the positive electrode sheet or the surface B faces the negative electrode sheet.
In addition, the invention also provides another method for checking the orientation of the coating diaphragm on line, which comprises the following steps:
s1, selecting a proper coating test pen according to different surface tensions of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen is c, one surface of the coating diaphragm is a surface A, the surface tension value of the surface A is a, the other surface of the coating diaphragm is a surface B, the surface tension value of the surface B is B, and a > c > B;
s2, firstly, scribing on one surface of the coating diaphragm by using the coating test pen, taking a picture by using a CCD imaging mechanism after 1-10S, judging the condition of a line segment by using a PLC (programmable logic controller) console, and presetting the error orientation of the coating diaphragm in the PLC console, wherein if the judged actual orientation is not consistent with the set error orientation, the orientation is correct; if the determined actual orientation is consistent with the set error orientation, the orientation is abnormal.
Preferably, in the step S2, the coated separator is set to have an incorrect orientation in which the surface a faces the negative electrode tab or the surface B faces the positive electrode tab.
Preferably, in the step S2, if the line segment is kept uniform, complete, faultless and not contracted, it indicates that the surface is the a surface; otherwise, if the line segment has obvious fault and contraction, the surface is the B surface. That is, in the single-layer coating separator, the coating surface (i.e., surface a) should be arranged corresponding to the positive electrode sheet, and the surface B should be arranged opposite to the positive electrode sheet. When the arrangement that the surface A of the coating diaphragm faces the positive plate or the surface B faces the negative plate is set in the PLC console in advance, namely the set direction is correct, and if the obtained actual direction is judged to be consistent with the set direction, the direction is correct; otherwise, the direction is abnormal, and the worker is prompted to change the direction of the diaphragm to ensure that the surface A of the coating diaphragm faces the positive plate. Similarly, the above determination method is referred to when setting the error orientation.
Preferably, the coating test pen is arranged after the coating diaphragm is fed, and is used for judging the orientation accuracy of the coating diaphragm in advance before winding or laminating. Before the detection device is arranged for feeding, the accuracy of the orientation of the diaphragm before winding or laminating is ensured, the membrane is not covered with rain, the situation that the coating surface of the diaphragm does not correspond to the positive plate after winding or laminating is prevented, and the sheep death is refused to be firmly supplemented is prevented, so that the problem of error orientation of the diaphragm is avoided from the source, and the loss of raw materials is reduced. When a coil of diaphragm is replaced in the production of the battery core, the test is required to be performed again, namely, the test is required to be performed again once every coil of diaphragm is produced.
Preferably, the motion of the coating test pen, the imaging of the CCD imaging mechanism and the determination of the orientation of the coating membrane are controlled by the PLC console. The motion of coating test pen is controlled through the PLC control cabinet, and after the test program of diaphragm coating orientation is opened, the coating test pen can be automatically scribed on the surface of the diaphragm under the control of PLC, and the diaphragm passing through the CCD imaging mechanism is photographed and conveyed to the PLC control cabinet, and the PLC control cabinet judges the diaphragm orientation through a preset program, and the automation of coating diaphragm orientation detection is realized.
Preferably, the PLC console is provided with a plurality of comparison photographs for comparing with the imaging photograph of the CCD imaging mechanism to determine the condition of the line segment. A large number of pictures are stored in the PLC console in advance, and after the test chart of the coating diaphragm is transmitted to the PLC console, the program runs to detect the test chart and judge the condition of the test line. Of course, other comparison methods can be used for detection and comparison, for example, whether the line segment is in a state of being kept uniform and complete, having no fault and not shrinking can be judged by sensing the line segment, and whether the orientation of the coating diaphragm is correct or not can be judged.
Preferably, the coating test pen is a dyne pen, and the surface tension value of the dyne pen is 28-70.
The invention also aims to provide a device for checking the orientation of the coating diaphragm on line, which comprises a coating test pen, a CCD imaging mechanism and a PLC console, wherein the coating test pen is electrically connected with the PLC console, and the CCD imaging mechanism is electrically connected with the PLC console.
Preferably, the mounting distance between the coating test pen and the CCD imaging mechanism is greater than or equal to the product of the running speed of the coating diaphragm and the test time.
Preferably, an alarm is further arranged in the PLC console, and if it is determined that the coating surface or the thick coating surface of the coating diaphragm does not face the positive plate, the alarm is activated to give an alarm.
The invention has the beneficial effects that:
1) The invention provides a method for checking the orientation of a coating diaphragm on line, which comprises the following steps: s1, selecting a proper coating test pen according to the difference of surface tension of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen is c, one surface of the coating diaphragm is taken as an A surface, the surface tension value of the A surface is a, the other surface of the coating diaphragm is taken as a B surface, and the surface tension value of the B surface is B, wherein a is more than c and more than B; s2, firstly, marking a line on one surface of the coating diaphragm by using the coating test pen, taking a picture by using a CCD imaging mechanism after 1-10S, judging the condition of the line segment by using a PLC (programmable logic controller) console, and presetting the correct orientation of the coating diaphragm in the PLC console, wherein if the judged actual orientation is consistent with the set correct orientation, the correct orientation is indicated; if the determined actual orientation does not match the set correct orientation, the orientation is abnormal. Compared with the prior art, the method for judging the orientation of the coating diaphragm provided by the invention judges whether the orientation of the coating diaphragm is correct or not through the scribing test of the coating test pen by utilizing the difference of the surface tension of the two surfaces of the coating, compares the orientation condition obtained by actual judgment with the correct orientation set in the PLC console after a certain time, and indicates that the orientation is correct if the judged actual orientation is consistent with the set correct orientation; if the actual orientation determined does not match the set correct orientation, the orientation is abnormal, and the operator should be prompted to switch the orientation of the diaphragm. The method solves the problem that the diaphragm can not be ensured to face correctly by 100 percent at present, can ensure that the coating diaphragm faces correctly by 100 percent, can realize real-time inspection and feedback, and forms accurate data record for subsequent tracing.
2) The invention also provides a device for checking the orientation of the coating diaphragm on line, which has low cost and convenient manufacture, well solves the problem that the orientation of the coating diaphragm cannot be correctly ensured by 100 percent at present by the aid of a method for checking the orientation of the coating diaphragm, and is suitable for industrial practical application.
Drawings
FIG. 1 is a flow chart of the inspection method of the present invention.
FIG. 2 is a schematic view of the present invention.
FIG. 3 is an image of a line on the A side of the coated diaphragm.
FIG. 4 is an image of a line segment of the B-side of the coated diaphragm.
In the figure: 1-a coated test pen; 2-a CCD imaging mechanism; 3-PLC control console.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to specific embodiments and drawings of the specification, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 4, a method for on-line checking orientation of a coated separator includes the steps of:
s1, selecting a proper coating test pen 1 according to different surface tensions of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen 1 is c, one surface of the coating diaphragm is an A surface, the surface tension value of the A surface is a, the other surface of the coating diaphragm is a B surface, and the surface tension value of the B surface is B, wherein a is larger than c and larger than B;
s2, firstly, marking a line on one surface of the coating diaphragm by using the coating test pen 1, taking a picture by using the CCD imaging mechanism 2 after 1-10S, judging the condition of the line segment by using the PLC console 3, and setting the correct orientation of the coating diaphragm in the PLC console 3 in advance, wherein if the judged actual orientation is consistent with the set correct orientation, the orientation is correct; if the determined actual orientation does not match the set correct orientation, the orientation is abnormal.
In the embodiment, the PLC console 3 sets the correct orientation of the coating diaphragm to be that the surface A corresponds to the positive plate, and the coating test pen 1 is arranged opposite to the surface A and used for scribing on the surface A and is arranged after the coating diaphragm is fed and before the coating diaphragm is wound or laminated to judge the orientation accuracy of the coating diaphragm in advance. In addition, the movement of the coating test pen 1, the imaging of the CCD imaging mechanism 2 and the judgment of the orientation of the coating diaphragm are all controlled by the PLC console 3, after the testing program of the orientation of the coating of the diaphragm is started, the coating test pen 1 can automatically mark the surface of the diaphragm under the control of the PLC console 3, then the diaphragm passing through the CCD imaging mechanism 2 is photographed and transmitted to the PLC console 3, the PLC console 3 judges the orientation of the diaphragm through a preset program, and the automation of the orientation detection of the coating diaphragm is realized. A plurality of comparison pictures can be arranged in the PLC console 3, a large number of pictures are stored in the PLC console 3, after a test chart of the coating diaphragm (namely, an imaging picture of the CCD imaging mechanism) is transmitted to the PLC console 3, a program in the PLC console 3 runs to detect the test chart, the condition of a test line is judged, if a line section obtained through detection still keeps a uniform and complete, faultless and non-shrinkage state, the surface is represented as an A surface, the A surface is consistent with the setting, the orientation is represented correctly, and the next step of working procedure can be carried out. Of course, other comparison methods can be used for detection and comparison, for example, whether the line segment is in a state of being kept uniform and complete, having no fault and not shrinking can be judged by sensing the line segment, and whether the orientation of the coating diaphragm is correct or not can be judged.
For example, a single-side PVDF coating diaphragm of 16+2 μm is tested, the surface tension value of the A side of the diaphragm is 50, the surface tension value of the B side of the diaphragm is 36, the value range of the surface tension value which can be detected by the coating test pen 1 (adopting a dyne pen) is 50>c 36, the value of c is recommended to be 40-46, and the value is the model value of the dyne pen. Setting the surface A of the coating diaphragm towards the positive plate, starting a testing program of the orientation of the coating diaphragm after the diaphragm is fed, automatically scribing a line on the surface of the coating diaphragm by a coating testing pen 1 under the control of a PLC (programmable logic controller) console 3, automatically photographing and imaging by a CCD imaging mechanism 2 after 1-10 s, and transmitting a picture to the PLC console 3, judging that the surface is the surface A or the surface B according to an image of a line segment, if the surface A is judged, namely the actual orientation of the coating diaphragm is consistent with the setting, indicating that the diaphragm is in a normal orientation, and performing a winding or laminating process when the winding or laminating equipment normally operates; on the contrary, if the surface B is judged, namely the actual orientation of the coating diaphragm is inconsistent with the set orientation, the abnormal orientation of the diaphragm is indicated, and an alarm prompt is performed. The images of the line segments may be as shown in fig. 3-4. The detection principle of the diaphragm with different coatings on two surfaces is the same, and the diaphragm can be tested by referring to the testing method of the diaphragm with the coating on one surface, and the detailed description is omitted here.
The utility model provides a device of on-line inspection coating diaphragm orientation, includes coating test pen 1, CCD imaging mechanism 2 and PLC control cabinet 3, and coating test pen 1 is connected with 3 electricity of PLC control cabinet, and CCD imaging mechanism 2 is connected with 3 electricity of PLC control cabinet.
The PLC console 3 is also provided with an alarm, and if the orientation of the coating diaphragm is judged to be wrong, the alarm is started to give an alarm; on the contrary, if the orientation of the coating diaphragm is judged to be correct, the winding or laminating equipment is normally operated, and the winding or laminating process can be carried out. The installation distance between the coating test pen 1 and the CCD imaging mechanism 2 is greater than or equal to the product of the running speed of the coating diaphragm and the test time; the diaphragm can be set to be equal, the diaphragm can be shot through the set position of the CCD imaging mechanism after the test time is met, the running speed of the diaphragm is 1-50 m/min, the diaphragm can be selected according to the actual situation, and the test time can be more preferably 1-5 s.
Example 2
The difference from example 1 is the orientation setting of the PLC console 3 for the coated membrane and the position of the coated test pen 1. The PLC console 3 of the embodiment sets the surface B of the coating diaphragm to face the negative plate, the coating test pen 1 is arranged opposite to the surface B and used for marking a line on the surface B correspondingly, and if the line is in a correct direction, the judging method is the same as that of the embodiment 1, and if the judged direction of the coating diaphragm is consistent with the set direction, the direction is normal; on the other hand, if the determined orientation of the coated membrane is consistent with the set orientation, the orientation is wrong.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
Unlike example 1, the orientation of the PLC console 3 with respect to the surfaces a and B of the coated separator was set. The PLC console 3 of this embodiment sets the orientation of the coated separator a toward the negative plate, that is, the orientation is wrong, and accordingly, the determination method is changed accordingly, and if the determined orientation of the coated separator is not consistent with the setting, it indicates that the orientation is normal; on the other hand, if the determined orientation of the coated separator is consistent with the set orientation, it indicates that the orientation is wrong.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 3 is the orientation setting of the PLC console 3 for the coated membrane and the position of the coated test pen 1. In the PLC console of this embodiment, the surface B of the coating diaphragm is set to face the positive plate, the coating test pen 1 is disposed opposite to the surface B, and is used to mark a corresponding line on the surface B, and if the determined direction of the coating diaphragm is not consistent with the set direction, the direction is normal, and the direction is also wrong; on the other hand, if the determined orientation of the coated membrane is consistent with the set orientation, the orientation is wrong.
Compared with the prior art, the invention provides the setting and judging method of the four coating test pens, which can realize the detection of the coating diaphragm, ensure the 100% accuracy of the test result and improve the yield of the product. When the battery core needs to be subjected to defective product detection subsequently, the reason why the defective product is found in time by the original data can be traced back, so that the performance of the product can be corrected better.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, substitutions or alterations based on the present invention will fall within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. A method of on-line checking the orientation of a coated membrane, comprising the steps of:
s1, selecting a proper coating test pen according to the difference of surface tension of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen is c, one surface of the coating diaphragm is taken as an A surface, the surface tension value of the A surface is a, the other surface of the coating diaphragm is taken as a B surface, and the surface tension value of the B surface is B, wherein a is more than c and more than B;
s2, the coating test pen can automatically mark a line on the surface of the diaphragm under the control of the PLC console, a CCD imaging mechanism is used for photographing after 1-10S, and then the condition of the line segment is judged through the PLC console, if the line segment is kept uniform and complete, and has no fault and no shrinkage, the surface is an A surface; otherwise, if the line segment has obvious fault and shrinkage, the surface is represented as a surface B, the correct orientation of the coating diaphragm is set in the PLC console in advance, and the correct orientation of the coating diaphragm is set to be that the surface A faces the positive plate or the surface B faces the negative plate;
if the judged actual orientation is consistent with the set correct orientation, the orientation is correct; if the determined actual orientation does not match the set correct orientation, the orientation is abnormal.
2. A method of on-line checking the orientation of a coated membrane, comprising the steps of:
s1, selecting a proper coating test pen according to different surface tensions of two surfaces of a coating diaphragm, wherein the surface tension value which can be detected by the coating test pen is c, one surface of the coating diaphragm is a surface A, the surface tension value of the surface A is a, the other surface of the coating diaphragm is a surface B, the surface tension value of the surface B is B, and a > c > B;
s2, the coating test pen can automatically mark lines on the surface of the diaphragm under the control of a PLC (programmable logic controller) console, a CCD (charge coupled device) imaging mechanism is used for taking a picture after 1-10S, and then the condition of the line segment is judged through the PLC console, if the line segment is kept to be uniform and complete, and has no fault and no shrinkage, the surface is represented as an A surface; otherwise, if the line segment has obvious fault and shrinkage, the surface is a surface B, the wrong orientation of the coating diaphragm is set in the PLC console in advance, and the wrong orientation of the coating diaphragm is set to be that the surface A faces the negative plate or the surface B faces the positive plate;
if the judged actual orientation is not consistent with the set error orientation, indicating that the orientation is correct; if the determined actual orientation is consistent with the set error orientation, the orientation is abnormal.
3. The method for on-line inspection of the orientation of the coated membrane according to claim 1 or 2, wherein the coating test pen is provided after the coating membrane is fed for previously judging the accuracy of the orientation of the coated membrane before winding or lamination.
4. The method for on-line inspection of the orientation of the coated membrane according to claim 1 or 2, wherein the movement of the coated test pen, the imaging of the CCD imaging mechanism and the determination of the orientation of the coated membrane are controlled by the PLC console.
5. An apparatus for on-line inspection of the orientation of a coated membrane according to any one of claims 1 to 4, comprising a coating test pen, a CCD imaging mechanism and a PLC console, the coating test pen being electrically connected to the PLC console and the CCD imaging mechanism being electrically connected to the PLC console.
6. The apparatus of claim 5, wherein the coating test pen is mounted at a distance from the CCD imaging mechanism greater than or equal to the product of the running speed of the coated membrane and the test time.
7. The device of claim 6, wherein an alarm is further arranged in the PLC console; and if the orientation is judged to be wrong, starting the alarm to alarm.
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| CN202010047769.4A CN111208136B (en) | 2020-01-16 | 2020-01-16 | Method and device for on-line checking orientation of coating diaphragm |
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