CN113865714A - Detection method for detecting transverse temperature distribution of pole piece and early warning of pole piece warping - Google Patents
Detection method for detecting transverse temperature distribution of pole piece and early warning of pole piece warping Download PDFInfo
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- CN113865714A CN113865714A CN202110998098.4A CN202110998098A CN113865714A CN 113865714 A CN113865714 A CN 113865714A CN 202110998098 A CN202110998098 A CN 202110998098A CN 113865714 A CN113865714 A CN 113865714A
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- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000009826 distribution Methods 0.000 title claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 19
- 238000005336 cracking Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010924 continuous production Methods 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010224 classification analysis Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0044—Furnaces, ovens, kilns
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses a detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping.A temperature sensor is arranged in an oven, and the temperature sensor is distributed along the width direction of the pole piece and is used for detecting the temperature difference in the width direction of the pole piece; setting early warning levels of the temperature difference of the pole pieces according to the temperature difference value, and sending early warning information of different levels according to the detected temperature difference; the temperature sensor installed in the oven is an infrared temperature sensor, and the infrared temperature sensor is one of a surface temperature sensor, a linear temperature sensor and a point temperature sensor. The detection method for detecting the transverse temperature distribution of the pole piece and early warning of the warping of the pole piece can realize closed-loop control of the temperature of a product, realize online temperature detection, find problems in advance, avoid problem amplification, contribute to improving the quality and the qualification rate of the product, avoid belt breakage, cannot influence continuous production, and greatly improve the production efficiency.
Description
Technical Field
The invention relates to the field of pole piece coating, in particular to a detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping.
Background
In the field of battery production, drying the coated pole piece is a very important process, and an oven is generally adopted to complete the process.
The heating function of the existing oven basically sets the heating temperature, and the feedback of the actual temperature on the film and foil pole pieces is avoided. The closed-loop control of the temperature is a closed loop of temperature detection of a heating bag in the oven or a certain point in the oven, and the actual temperature of a product is not closed. Especially, when the product is heated unevenly in different regions, the dryness of the coating is inconsistent, and even the coating cracks excessively, the problems cannot be found on line and the temperature and the air quantity of the oven can be adjusted in time, so that the problems are amplified, the conditions such as coating cracking and the like occur, the product percent of pass is reduced, the belt breakage remediation is needed, the continuous production is influenced, and the production efficiency is seriously reduced.
To this end, the invention aims to provide a new solution to the existing technical drawbacks
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping, and the technical defects that closed-loop control detection of product temperature cannot be realized, problems cannot be found and adjusted on line, product yield and production efficiency are influenced and the like in the prior art are overcome.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping comprises the following steps:
installing temperature sensors in the oven, wherein the temperature sensors are distributed along the width direction of the pole piece and are used for detecting the temperature difference in the width direction of the pole piece;
and setting the early warning level of the temperature difference of the pole piece according to the temperature difference value, and sending early warning information of different levels according to the detected temperature difference.
As a further improvement of the above technical solution, the temperature sensor installed in the oven is an infrared temperature sensor, and the infrared temperature sensor is one of a surface temperature sensor, a linear temperature sensor and a point temperature sensor.
As a further improvement of the above technical solution, the infrared temperature sensor is a point temperature sensor, at least three points are selected in the width direction of the pole piece to detect the temperature of the pole piece, and the distance from the point temperature sensor at the edge position of the pole piece to the edge position of the pole piece is greater than 10mm and less than 10 cm.
As a further improvement of the above technical solution, when the infrared temperature sensor is a surface temperature sensor or a linear temperature sensor, the obtained temperature information is a continuously changing temperature distribution image matched with the position of the pole piece.
As a further improvement of the above technical solution, a plurality of distance or height detecting elements are provided along the width direction of the pole piece, and the distance or height detecting elements are used for detecting the height of the pole piece in the width direction.
As a further improvement of the above technical solution, a distance or height detection element is used to collect height data of at least five points along the width direction of the pole piece, wherein:
the two distance or height detection elements on the left side are respectively 10mm and 10cm away from the left side edge of the pole piece, the two distance or height detection elements on the right side are respectively 10mm and 10cm away from the right side edge of the pole piece, and the rest distance or height detection elements are arranged in the middle of the pole piece and distributed along the width direction of the pole piece.
As a further improvement of the technical scheme, the early warning grade comprises three grades along the width direction of the pole piece, and each grade is set according to the difference between the real-time temperature value and the basic temperature value.
As a further improvement of the above technical solution:
1. the temperature difference of each subarea is in good grade within 3 degrees,
2. the temperature difference of each subarea is in a normal grade within 5-7 degrees,
3. the temperature difference of each zone is 10-12 degrees and is approximately in a dry or cracking grade.
As a further improvement of the technical scheme, the basic temperature value is an ideal drying temperature after coating of each pole piece, the ideal drying temperature is obtained through a large number of tests and test data, and the influence factors of the ideal temperature drying temperature comprise a slurry formula and slurry viscosity.
As a further improvement of the technical scheme, a temperature sensor is added to the number of oven sections for generating phase change on the pole piece coating.
As a further improvement of the technical scheme, the number of the oven sections provided with the sensors is 4-5 sections and 9-10 sections.
The invention has the beneficial effects that: the invention provides a method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warpage, which is mainly characterized in that a temperature sensor is arranged along the width direction of the pole piece, the temperature of each area of a product is monitored by the temperature sensor, closed-loop monitoring of the temperature of the product is realized, closed-loop control of a certain point in a heating bag or an oven in the prior art is replaced, the surface temperature of the product can be monitored more accurately, pretightening information is sent on line, operators can conveniently make corresponding adjustment according to the pretightening information, problems are found and solved in advance, the problem is avoided being enlarged, coating warpage cracking is prevented, the product percent of pass is favorably improved, the phenomena of belt breakage and the like are avoided, and the production efficiency is improved.
In conclusion, the detection method for detecting the transverse temperature distribution of the pole piece and early warning the warping of the pole piece solves the technical defects that the prior art cannot realize closed-loop control detection of the temperature of a product, cannot find problems and adjust on line, and influences the qualification rate and the production efficiency of the product.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram showing the arrangement of temperature sensors, distance or height detecting elements, in a plan view of an oven and a pole piece, according to example 1 of the present invention;
FIG. 2 is a schematic diagram of a pole piece width cross section and a structure with edge warping;
FIG. 3 is a schematic diagram of a pole piece width cross section and a structure with raised edges;
FIG. 4 is a schematic diagram of a cross section of the width of a pole piece and a structure with a middle fold.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical features in the invention can be interactively combined on the premise of not conflicting with each other, and refer to fig. 1-4.
The technical scheme aims at: the online detection is carried out on the temperature of the product in the oven, the closed-loop control of the product temperature, the set temperature of the oven and the partition heating of the air nozzle is realized, the warping of the product (pole piece, film and the like) caused by uneven heat exchange and uneven temperature distribution is early warned in advance, and the more serious cracking of the coating is prevented.
According to the detection of the transverse temperature distribution of the pole piece, the early warning of the warping degree of the pole piece and the control of the air volume (heat carrier) ratio of the middle area and the two side areas of the air nozzle, the average and consistent air volume and heat flowing through the foil are controlled.
The technical scheme is as follows: a detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping comprises the following steps:
installing temperature sensors in the oven, wherein the temperature sensors are distributed along the width direction of the pole piece and are used for detecting the temperature difference in the width direction of the pole piece;
and setting the early warning level of the temperature difference of the pole piece according to the temperature difference value, and sending early warning information of different levels according to the detected temperature difference.
In the scheme, the transverse temperature difference of the pole piece, excessive drying caused by the transverse temperature difference, abnormal surface tension warping deformation, even coating cracking, fruit tracing, reason tracing and quantitative classification are carried out. According to the online monitoring of the temperature difference, the deformation area and the deformation quantity, the grading early warning is carried out, and the problems are found and solved in advance; problem amplification is avoided: the coating cracking qualification rate is reduced, and the continuous production is influenced by the broken belt.
The temperature sensor installed in the oven is an infrared temperature sensor, the infrared temperature sensor is one of a surface temperature sensor, a linear temperature sensor and a point temperature sensor, and particularly, in practical application, an implementer can select a proper temperature sensor according to needs. For example, different levels of configuration are made according to cost and accuracy requirements; specifically, surface temperature detection and line temperature detection are carried out, and early warning is given according to the coloring of the image of the temperature grade region; and (4) performing grading feedback and early warning according to the feedback numerical value when the point temperature is detected.
Referring to fig. 1, in one embodiment, the infrared temperature sensor is a point temperature sensor, at least three points in the width direction of the pole piece are selected to detect the temperature of the pole piece, and in practical application, the temperatures of at least three points on the left, middle and right in the width direction of the pole piece and the foil are collected.
The distance between the position of the point temperature sensor at the edge position of the pole piece and the edge position of the pole piece is more than 10mm and less than 10 cm.
The reason for setting such a distance is:
within 10mm from the edge of the pole piece, the copper foil is a copper foil white area, the temperature of the copper foil white area is generally higher than that of a coating area, and a point type temperature sensor is easy to missense that the temperature of the coating area is high.
The position 10cm away from the edge of the pole piece is a boundary and transition area of air flow in the middle of the air nozzle and the edge air flow, and common pole piece warping and protruding abnormity are in the area.
When the infrared temperature sensor is a surface temperature sensor or a linear temperature sensor, the obtained temperature information is a continuously-changed temperature distribution image matched with the position of the pole piece, the temperature distribution image of the pole piece and the foil can be observed in real time, and the temperature changes are continuous.
In addition, a plurality of distance or height detection elements are arranged along the width direction of the pole piece, the distance or height detection elements are used for detecting the height of the pole piece in the width direction, and the height of the pole piece is detected in real time through the distance or height detection elements. The distance or height detection element generally adopts a height sensor after distance, and when the detected height exceeds a set value, an early warning is sent out.
Referring to fig. 1, in the present embodiment, a distance or height detection element is used to collect height data of at least five points along the width direction of a pole piece, wherein:
the two distance or height detection elements on the left side are respectively 10mm and 10cm away from the left side edge of the pole piece, the two distance or height detection elements on the right side are respectively 10mm and 10cm away from the right side edge of the pole piece, and the rest distance or height detection elements are arranged in the middle of the pole piece and distributed along the width direction of the pole piece.
In fig. 1, 1 is a pole piece, 2 is a point temperature sensor, 3 is a distance or height detecting element, and 4 is an oven.
The height detection is more than the temperature detection by at least two detection points, so as to finely distinguish the edge warping or bulging of the pole piece.
In the technical scheme, when the early warning level is set, the early warning level comprises three levels along the width direction of the pole piece, and each level is set according to the difference between the real-time temperature value and the basic temperature value.
In the present embodiment, the first and second electrodes are,
1. the temperature difference of each subarea is in good grade within 3 degrees,
2. the temperature difference of each subarea is in a normal grade within 5-7 degrees,
3. the temperature difference of each zone is 10-12 degrees and is approximately in a dry or cracking grade.
The basic temperature value is the ideal drying temperature of each coated pole piece, the ideal drying temperature is obtained through a large number of tests and test data, and the influence factors of the ideal temperature drying temperature comprise the slurry formula and the slurry viscosity.
In practical application, based on a large amount of experimental data, the difference of the transverse sections of the temperature of the pole piece is divided into 3 grades, the temperature is within 3 degrees, the temperature is normal at 5-7 degrees, and the temperature is likely to cause inconsistent drying and even cracking at 10-12 degrees.
When the temperature difference between the sub-regions is controlled within 3 degrees in the width direction of the product, the pole piece is integrally flat, and the drying degree and gradient of each drying oven are basically consistent;
when the temperature difference between each section in the width direction of the product is controlled to be about 5-7 degrees, the edge of the pole piece can be dried in advance, warped to a small extent, but not cracked too dry;
in the width direction of the product, when the temperature difference among all the sub-regions in a plurality of continuous drying ovens continuously exceeds 10-12 degrees, the large difference of the surface dryness and the inconsistent surface tension of the coating easily cause the obvious bulge or warpage, even cracking at the 10mm-10CM position of the edge of the pole piece.
The specific temperature may vary with the formulation and viscosity of the slurry, but the classification concept and method are basically the same, and the practitioner can make corresponding settings according to the different formulations of the slurry and the different viscosities thereof.
The number of oven sections generating phase change on the pole piece coating increases the temperature sensor; the number of the oven sections provided with the sensors is 4-5 sections and 9-10 sections.
In conclusion, according to the transverse temperature difference of the width of the pole piece and the deformation amount of the height direction, a combination criterion is formed, and the temperature, the wind speed, the air nozzle partition and the turbulent flow of the oven are finely controlled.
In the technical scheme, when the pole piece is warped at the edge, raised at the edge and folded at the middle part, the equipment performs early warning.
The conditions, positions and classifications of pole piece warping, bulging and wrinkling are as follows:
referring specifically to fig. 2, region a in fig. 2 is a pole piece edge warp region,
edge warping: the coating is often coated on a single surface, the temperature of the coating on the edge of the pole piece is high, the accumulated drying is inconsistent, and the surface tension is inconsistent and rises.
Referring specifically to fig. 3, region B in fig. 3 is a raised area at the edge of the pole piece,
edge projection: often occurs with double-sided coating, with wet second-side coating edges, inconsistent cumulative drying, and inconsistent surface tension. If the difference is not eliminated in the middle section oven, after the rear section oven forms fixed deformation, the outlet of the tail section oven is forcedly flattened, so that the pole piece coating is obviously cracked.
Referring specifically to fig. 4, region C in fig. 4 is a central wrinkled region of the pole piece,
middle wrinkling: in order to solve the problems of pole piece warping, raised temperature accumulated difference and excessive edge drying, the temperature of an oven and the air speed of an air nozzle are reduced; instead, the edges are just dry, but the middle is wet, causing microcreping.
Therefore, when the various pole pieces are warped, raised and wrinkled, the pole pieces are detected on line and found in time, and basic data and classification analysis are stored for solving the problems. The problem amplification is avoided, and the continuous production is influenced because the time is consumed for breaking and connecting the belt for hours.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A detection method for detecting transverse temperature distribution of a pole piece and early warning of pole piece warping is characterized by comprising the following steps:
installing temperature sensors in the oven, wherein the temperature sensors are distributed along the width direction of the pole piece and are used for detecting the temperature difference in the width direction of the pole piece;
and setting the early warning level of the temperature difference of the pole piece according to the temperature difference value, and sending early warning information of different levels according to the detected temperature difference.
2. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 1, wherein the detection method comprises the following steps: the temperature sensor installed in the oven is an infrared temperature sensor, and the infrared temperature sensor is one of a surface temperature sensor, a linear temperature sensor and a point temperature sensor.
3. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 2, wherein the detection method comprises the following steps: the infrared temperature sensor is a point temperature sensor, at least three points are selected in the width direction of the pole piece to detect the temperature of the pole piece, and the distance between the position of the point temperature sensor at the edge position of the pole piece and the edge position of the pole piece is more than 10mm and less than 10 cm.
4. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 1, wherein the detection method comprises the following steps: when the infrared temperature sensor is a surface temperature sensor or a linear temperature sensor, the obtained temperature information is a continuously-changed temperature distribution image matched with the position of the pole piece.
5. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 1, wherein the detection method comprises the following steps: a plurality of distance or height detecting elements for detecting the height of the pole piece in the width direction are provided along the width direction of the pole piece.
6. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 5, wherein the detection method comprises the following steps: the method comprises the steps that height data of at least five points are collected by distance or height detection elements along the width direction of a pole piece, wherein the two distance or height detection elements on the left side are respectively 10mm and 10cm away from the left edge of the pole piece, the two distance or height detection elements on the right side are respectively 10mm and 10cm away from the right edge of the pole piece, and the rest distance or height detection elements are arranged in the middle of the pole piece and distributed along the width direction of the pole piece.
7. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 1, wherein the detection method comprises the following steps: the early warning grades comprise three grades along the width direction of the pole piece, and each grade is set according to the difference between the real-time temperature value and the basic temperature value.
8. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 7, wherein the detection method comprises the following steps: the temperature difference of each subarea is in a good grade within 3 degrees, the temperature difference of each subarea is in a normal grade within 5-7 degrees, and the temperature difference of each subarea is in a rough drying or cracking grade within 10-12 degrees.
9. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 7, wherein the detection method comprises the following steps: the basic temperature value is the ideal drying temperature of each coated pole piece, the ideal drying temperature is obtained through a large number of tests and test data, and the influence factors of the ideal temperature drying temperature comprise the slurry formula and the slurry viscosity.
10. The detection method for detecting the transverse temperature distribution and warning the warping of the pole piece according to claim 1, wherein the detection method comprises the following steps: the number of oven sections generating phase change on the pole piece coating increases the temperature sensor; the number of the oven sections provided with the sensors is 4-5 sections and 9-10 sections.
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| CN202110998098.4A CN113865714A (en) | 2021-08-27 | 2021-08-27 | Detection method for detecting transverse temperature distribution of pole piece and early warning of pole piece warping |
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