CN111146399A - Closed-loop adjusting method for coating surface density - Google Patents
Closed-loop adjusting method for coating surface density Download PDFInfo
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- CN111146399A CN111146399A CN201911273553.3A CN201911273553A CN111146399A CN 111146399 A CN111146399 A CN 111146399A CN 201911273553 A CN201911273553 A CN 201911273553A CN 111146399 A CN111146399 A CN 111146399A
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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Abstract
The invention provides a closed-loop adjusting method of coating surface density, which comprises the following steps: s1, substituting the solid content value and density value of the slurry into the calculation formula F of the coating surface density and the wet film thickness in advance, and determining the tolerance region Y of the coating surface density1Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2(ii) a S2, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness values if the actual wet film thickness value exceeds the tolerance region Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made. Compared with the prior art, the method determines the coating through the calculation formula FThe specific relational expression of the cloth cover density and the wet film thickness provides a precise regulation reference range for the regulation of the surface density, and solves the problem of inaccurate regulation of the surface density at present.
Description
Technical Field
The invention relates to the field of coating, in particular to a closed-loop adjusting method for coating surface density.
Background
The lithium ion battery has the advantages of high energy density, long service life, environmental protection and the like, so the lithium ion battery is more and more widely used. Coating is a critical part of the manufacturing process of lithium ion batteries. The quality of the pole piece coating is often directly determined by the quality of the battery. And the control of the coating surface density is one of the most critical control points of coating.
In order to improve the uniformity of the coating areal density and reduce process fluctuations, the use of areal density closed-loop control is now a common method. Among the existing closed-loop control methods, there are mainly two adjustment methods: firstly, closed-loop adjustment of surface density is realized according to on-line weight/thickness measurement of a tail; and secondly, closed-loop regulation is carried out according to the thickness of the wet film of the machine head. However, both of the two adjustment methods have certain disadvantages: 1) by adopting the on-line measurement closed-loop adjusting method of the tail, the measurement feedback device and the adjusting device are separated too far, so that the adjustment has hysteresis, the on-line adjustment cannot be well realized, the generation of bad pole pieces cannot be avoided, and the coating time of the working procedure can be increased by the subsequent adjustment; 2) the thickness of the wet film of the machine head is adjusted, although the hysteresis quality of adjustment is avoided, the corresponding relation between the thickness of the wet film and the surface density is lacked at present, and the condition of inaccurate adjustment exists.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
The invention aims to: the closed-loop adjusting method for the coating surface density is provided, and the problems of hysteresis and inaccuracy existing in the closed-loop adjusting method for the coating surface density in the prior art are solved. According to the invention, the corresponding relation between the thickness of the coating wet film and the surface density is provided, so that the consistency of the surface density can be controlled by accurately adjusting the thickness of the wet film, and the operability of the coating surface density wet film thickness measurement closed-loop adjusting method is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a closed-loop regulating method for coating surface density comprises the following steps:
s1, substituting the solid content value and density value of the slurry into the calculation formula F of the coating surface density and the wet film thickness in advance, and determining the tolerance region Y of the coating surface density1Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2(ii) a The calculation formula F is: rhom＝h(ρWt％)+C；ρmIs the coating areal density in mg/cm2(ii) a Rho is the density of the slurry and is given in g/cm3(ii) a The weight percent is the solid content of the slurry; h is the wet film thickness in μm; c is a compensation value;
s2, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness values if the actual wet film thickness value exceeds the tolerance region Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made.
By determining the relation between the coating surface density and the wet film thickness, the invention can obtain the calculated relation rho because only the solvent of the slurry is removed in the coating and drying processmAnd (4) s-hs rho Wt% (s is the coating area), and the calculation formula F can be obtained after simplification. Firstly, determining a tolerance area Y of the density value of a coating surface according to actual coating requirements1Tolerance region Y1The tolerance region Y is obtained from the calculation formula F for the process conditions that can be determined in actual production1Tolerance region Y of corresponding wet film thickness2The thickness value of the wet film obtained by actual measurement and the tolerance area Y are compared2Comparing to judge whether the actual wet film thickness value falls into the tolerance region Y2And then whether or not the wet film thickness needs to be adjusted. If the actual wet film thickness value is in the tolerance region Y2The actual coating surface density value is proved to be similar to other surface density values, the coating surface density consistency of the pole piece is high, and adjustment is not needed; whereas if the actual wet film thickness value is not within this range, the uniformity of the areal density of the coating is demonstrated to be poor, and the wet film thickness needs to be adjusted to improve the uniformity of the areal density of the coating. Therefore, the problem of inaccuracy existing in the closed-loop adjusting method of the coating surface density machine head is solved, and compared with the existing machine tail adjusting method, the problem that a measuring feedback device is far away from an adjusting device does not exist, so that the problem of hysteresis existing in adjustment is avoided, and the adjusting accuracy is improved.
Preferably, the slurry is a slurry of a suspension system, including one of a lithium battery electrode slurry, a ceramic coating slurry or a paint coating. Of course, other specific suspension slurries can be adopted, and the wet film thickness can be adjusted by adopting the calculation formula F indicated by the invention, so that the consistency of the coating surface density can be improved.
Preferably, when the coating surface density adjustment is started, the pole piece is debugged in advance, the actual coating surface density value and the wet film thickness value of the pole piece are measured, then the wet film thickness value is substituted into a calculation formula F to obtain a calculated coating surface density value, and a compensation value C in the calculation formula F is a difference value obtained by subtracting the calculated coating surface density value from the actual coating surface density value. The addition of the compensation value C further improves the accuracy of adjustment, and when the actual coating surface density of the first piece is the same as the calculated coating surface density value, the compensation value C is zero, namely, no compensation is needed.
Preferably, the debugging pole piece is N pole pieces, the compensation value C is an average value of N difference values, and N is a positive integer. The number of the pole pieces can be determined according to specific process requirements, and if the compensation value calculated in the first measurement is small, the result of the first measurement can be directly used as the compensation value; however, if the result of the compensation value is found to be larger, the surface density values of a plurality of groups of pole pieces can be measured according to the requirement, and then the average value of the obtained compensation values C is taken.
Preferably, the debugging pole piece is three pole pieces, and the obtained compensation value C is an average value of three difference values. And determining the compensation value C through the average value of three times, so that the accuracy of the compensation value can be further determined, and the accuracy of adjustment is ensured.
Preferably, in step S1, a map R of the coating areal density and wet film thickness at the solid content value and density value of the slurry is obtained from the calculation formula F, and a tolerance region Y is selected from the map R2. Whether the wet film thickness needs to be adjusted can be judged more intuitively from the correspondence map R.
Preferably, the step S1 further includes storing the calculation formula F in a PLC console.
Preferably, the step of S2 further comprises storing the measured actual wet film thickness value in the PLC console. And various data are controlled by utilizing the control console PLC, so that the calculation accuracy and the adjustment efficiency are improved. The control console adopted by the method is a conventional PLC control console which can be purchased from the market, and is not described again.
Preferably, the closed-loop adjusting method of the coating surface density is used for adjusting the coating surface density of the positive plate or the negative plate. The adjusting method is suitable for adjusting the positive plate or the negative plate, the final calculation formula F is determined according to the difference of the slurry density and the solid content of the positive plate or the negative plate, and the tolerance area Y1Is also entered by the particular pole pieceTo determine a suitable adjustment range, i.e. to determine a tolerance region Y2The range of (1). For other slurry in suspension system, the adjusting method refers to the adjusting method of the coating surface density of the positive and negative plates.
The invention has the beneficial effects that:
1) the invention provides a closed-loop adjusting method of coating surface density, which comprises the following steps: s1, substituting the solid content value and density value of the slurry into the calculation formula F of the coating surface density and the wet film thickness in advance, and determining the tolerance region Y of the coating surface density1Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2(ii) a S2, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness values if the actual wet film thickness value exceeds the tolerance region Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made. Compared with the prior art, the method determines the specific corresponding relation between the coating surface density and the wet film thickness through the calculation formula F, and then determines the tolerance area Y according to the actual production requirement1The tolerance region Y of the wet film thickness is obtained by using the corresponding relation2The range of the method provides an adjustment reference range for subsequent adjustment of the coating surface density, so that the problem of inaccurate adjustment of the coating surface density at present is solved, the uniformity of the surface density is improved, and the operability of the closed loop adjustment method for wet film thickness measurement of the coating surface density is improved.
2) The invention also provides a calculation mode of the compensation value, and the consistency of the coating surface density is further improved. The method has strong operability, the combination of the adjusting method and the prior art is strong, the method can be realized without overcoming external influence factors, and the method is suitable for industrialized actual production.
Drawings
Fig. 1 is a correspondence diagram R in example 1.
Fig. 2 is a correspondence diagram R in embodiment 2.
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 the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
It should be noted that, the adjusting part of the adjusting device adopted in the closed-loop adjusting method of the present invention is a conventional coating adjusting part, and the difference is that the adjusting device adopted in the present invention further includes a PLC console and a thickness measuring device electrically connected to the PLC console, the thickness measuring device is disposed at the head part, and the thickness measuring device includes a thickness sensor. When the pole piece passes near the thickness sensor, the thickness sensor can detect the coating thickness of slurry in the pole piece, then the measured data is transmitted and stored in the PLC console, and is displayed in the interactive interface, and the PLC console judges whether the measured data falls into the tolerance area Y or not through data operation2And transmitting the judgment result to the adjustment part, if it falls in the tolerance region Y2And in addition, no adjustment is needed; otherwise, the adjustment is carried out until the final wet film thickness value falls within the tolerance region Y2And completing closed-loop regulation of the coating surface density.
Example 1
A closed-loop regulating method for coating surface density comprises the following steps:
s1, the solid content value of the anode slurry is 47% and the density value is 1.33g/cm in advance3Substituting into calculation formula F of coating surface density and wet film thickness, and determining tolerance region Y of coating surface density according to actual production1Tolerance region Y of the negative electrode paste1In the range of 9.76. + -. 0.0976mg/cm2Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2Tolerance region Y2In the range of 156.1 + -1.56 μm; making a corresponding relation graph R of an initial corresponding relation of the coating surface density and the wet film thickness under the solid content value and the density value of the slurry obtained by the calculation formula F, and storing the initial corresponding relation graph R into a PLC console; the calculation formula F is: rhom＝h(ρWt％)+C；ρmFor coatingAreal density in mg/cm2(ii) a Rho is the density of the slurry and is given in g/cm3(ii) a The weight percent is the solid content of the slurry; h is the wet film thickness in μm; c is a compensation value; the obtained preliminary corresponding relation is rhom＝0.0625h+C。
And S2, when the coating surface density is adjusted, debugging the pole piece in advance, and calculating to obtain the actual value of the compensation value C. And (3) measuring the actual coating surface density value and the wet film thickness value of the pole piece, substituting the wet film thickness value into a calculation formula F to obtain the calculated coating surface density value, wherein the compensation value C in the calculation formula F is the difference value of subtracting the calculated coating surface density value from the actual coating surface density value. The pole pieces can be debugged according to actual production needs, so that the number of the pole pieces to be debugged can be determined, and the actual value of the compensation value C can be finally determined. The preselected debugging pole piece is 1 pole piece, and the calculated compensation value C is 0. Similarly, the obtained compensation value C is stored in the PLC console, and the final calculation formula F is obtained as rhom0.0625h to determine a final map R, and selecting a tolerance region Y of the wet film thickness in the map R2As shown in FIG. 1, the area within the box is the tolerance area Y2。
S3, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness values if the actual wet film thickness value exceeds the tolerance region Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made. That is, when the wet film thickness was measured to exceed 157.66 μm, it indicated that the coating areal density exceeded the tolerance region Y1The upper limit of (3) is required to be adjusted to reduce the thickness of the wet film so as to be kept within the tolerance region Y1Within the range; also when the wet film thickness was measured to be less than 154.54 μm, it indicates that the areal density exceeded the tolerance region Y1The lower limit of (2) is required to be adjusted to increase the thickness of the wet film so as to be kept within the tolerance region Y1Within the range; if the wet film thickness is uniformly maintained at about 156.1, the density of the coated surface is uniformly maintained at the targetWithin the standard, the coating surface density of the negative electrode is high in consistency.
Example 2
A closed-loop regulating method for coating surface density comprises the following steps:
s1, the solid content value of the positive electrode slurry is adjusted to 76% in advance, and the density value is adjusted to 2.5g/cm3Substituting into calculation formula F of coating surface density and wet film thickness, and determining tolerance region Y of coating surface density according to actual production1Tolerance region Y of the negative electrode paste1In the range of 19.7. + -. 0.197mg/cm2Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2Tolerance region Y2The range of (A) is 102.37 +/-1.02 mu m; making a corresponding relation graph R of an initial corresponding relation of the coating surface density and the wet film thickness under the solid content value and the density value of the slurry obtained by a calculation formula F, storing the initial corresponding relation graph R into a PLC console, and selecting a tolerance area Y of the coating surface density value in the corresponding relation graph R; the calculation formula F is: rhom＝h(ρWt％)+C；ρmIs the coating areal density in mg/cm2(ii) a Rho is the density of the slurry and is given in g/cm3(ii) a The weight percent is the solid content of the slurry; h is the wet film thickness in μm; c is a compensation value; the obtained preliminary corresponding relation is rhom＝0.19h+C。
And S2, when the coating surface density is adjusted, debugging the pole piece in advance, and calculating to obtain the actual value of the compensation value C. And (3) measuring the actual coating surface density value and the wet film thickness value of the pole piece, substituting the wet film thickness value into a calculation formula F to obtain the calculated coating surface density value, wherein the compensation value C in the calculation formula F is the difference value of subtracting the calculated coating surface density value from the actual coating surface density value. The pole pieces can be debugged according to actual production needs, so that the number of the pole pieces to be debugged can be determined, and the actual value of the compensation value C can be finally determined. The preselected debug pole pieces in this embodiment are 3 pole pieces, and the calculated compensation value C is 0.25. Similarly, the obtained compensation value C is stored in the PLC console, and the final calculation formula F is obtained as rhom0.19h +0.25 to determine the final mapping table R, and simultaneously selecting the wet film thickness in the mapping table RTolerance region Y of degree2. As shown in FIG. 2, the area within the box is the tolerance area Y2。
S3, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness values if the actual wet film thickness value exceeds the tolerance region Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made. That is, when the wet film thickness was measured to exceed 103.39 μm, it indicated that the coating areal density exceeded the tolerance region Y1The upper limit of (3) is required to be adjusted to reduce the thickness of the wet film so as to be kept within the tolerance region Y1Within the range; also when the wet film thickness was measured to be less than 101.35 μm, it indicates that the areal density exceeded the tolerance region Y1The lower limit of (2) is required to be adjusted to increase the thickness of the wet film so as to be kept within the tolerance region Y1Within the range; if the wet film thickness is kept consistent around 102.37, the coating surface density is consistent within the target specification, and the coating surface density consistency of the negative electrode is high.
Finally, the consistency of the coating surface density obtained by the adjustment of the invention is up to 98.8% by detecting and checking the coating surface density of the obtained pole piece, and repeated tests prove that a calculation formula F provided by the invention is suitable for the adjustment of the coating surface density of various sizing agents, has high consistency and completely meets the requirements of actual production. Compared with the prior art, the method has the advantages that the thickness of the wet film can be accurately adjusted by determining the relation between the coating surface density and the thickness of the wet film, so that the consistency of the coating surface density is ensured, and the energy density of the battery is ensured; the method solves the problems of hysteresis and inaccuracy existing in the closed-loop adjustment method for the coating surface density in the prior art.
It will be evident to those skilled in the art from the foregoing disclosure and teachings that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.
In addition, standard parts used in the invention can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, machines, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the details are not repeated.
Claims (7)
1. A closed-loop regulating method for coating surface density is characterized by comprising the following steps:
s1, substituting the solid content value and density value of the slurry into the calculation formula F of the coating surface density and the wet film thickness in advance, and determining the tolerance region Y of the coating surface density1Then, the tolerance region Y of the wet film thickness is determined by the calculation formula F2(ii) a The calculation formula F is: rhom＝h(ρWt％)+C；ρmIs the coating areal density in mg/cm2(ii) a Rho is the density of the slurry and is given in g/cm3(ii) a The weight percent is the solid content of the slurry; h is the wet film thickness in μm; c is a compensation value;
s2, measuring the actual wet film thickness, and comparing the measured thickness with the tolerance region Y2Comparing the inner wet film thickness value, if the actual wet film thickness value exceeds the valueOut of the tolerance area Y2Is adjusted so that the actual wet film thickness value falls within the tolerance region Y2Within the range of (1); on the contrary, if the actual wet film thickness value is in the tolerance region Y2Within the range of (3), no adjustment is made.
2. The closed-loop coating surface density adjusting method as claimed in claim 1, wherein when the coating surface density adjustment is started, the pole piece is debugged in advance, the actual coating surface density value and the wet film thickness value of the pole piece are measured, then the wet film thickness value is substituted into the calculation formula F to obtain the calculated coating surface density value, and the compensation value C in the calculation formula F is the difference value of the actual coating surface density value minus the calculated coating surface density value.
3. The closed-loop adjusting method for coating areal density according to claim 2, characterized in that the debugging pole piece is N pole pieces, the compensation value C is an average value of N difference values, and N is a positive integer.
4. The closed-loop coating area density adjusting method according to claim 1, wherein in step S1, a corresponding relation graph R of the coating area density and the wet film thickness under the solid content value and the density value of the slurry is obtained by a calculation formula F, and a tolerance region Y is selected from the corresponding relation graph R2。
5. The closed-loop adjusting method for coating areal density of claim 1, wherein in step S1, further comprising storing the calculation formula F into a PLC console.
6. The closed-loop coating areal density adjustment method of claim 1, wherein in step S2, further comprising storing the measured actual wet film thickness value in a PLC console.
7. The closed-loop adjusting method for the coating surface density according to claim 1, wherein the closed-loop adjusting method for the coating surface density is used for adjusting the coating surface density of the positive electrode sheet or the negative electrode sheet.
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| CN113959899A (en) * | 2021-10-11 | 2022-01-21 | 常州市大成真空技术有限公司 | Wet coating layer surface density measuring method and measuring system and electronic equipment |
| CN115000352A (en) * | 2022-06-14 | 2022-09-02 | 合肥国轩高科动力能源有限公司 | Power battery double-layer coating surface density adjusting method |
| 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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