CN113909050A - Coating surface density control device, coating machine and coating surface density control method - Google Patents
Coating surface density control device, coating machine and coating surface density control method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention provides a coating surface density control device, a coating machine and a coating surface density control method. The coating machine comprises a scraper roller, a coating roller and a coating surface density control device. In the coating surface density control device: the gap adjusting device is used for adjusting the gap between the scraper roller and the coating roller; the temperature measuring device is used for detecting temperature and providing a first detection signal and a second detection signal; the control unit is used for receiving the first detection signal and the second detection signal, comparing the first detection signal and the second detection signal, calculating the variation of the gap according to the comparison result, and controlling the gap adjusting device to compensate the gap according to the variation of the gap. The coating surface density control method comprises the following steps: acquiring a first detection signal and a second detection signal, wherein the first detection signal and the second detection signal are temperature detection signals; comparing the first detection signal with the second detection signal, and calculating the variation of the gap between the doctor roller and the coating roller according to the comparison result; and compensating the clearance according to the variation of the clearance.
Description
Technical Field
The invention relates to a technology related to lithium battery production, in particular to a coating surface density control device, a coating machine and a coating surface density control method.
Background
The coating process of the lithium battery pole piece is a very critical process in the production process of the lithium battery, the coating surface density is one of the most important technical parameters in the manufacture of the lithium battery, and the performance and the safety of the battery are directly determined.
The transfer type coating machine has the advantages of simple structure, simple and convenient operation, low cost of the whole machine and lower coating speed. Due to the characteristics, the equipment has wide application in research and development test production lines with low requirements on capacity and efficiency.
For transfer coating, the standard operating method for controlling surface density is generally as follows:
1) zero point calibration of the knife roll gap, namely measuring the gap between the scraper roll and the coating roll on the driving side and the operating side respectively by using a standard feeler gauge (for example, the thickness of 10-30 mu m), and setting the positions of the scraper roll on the driving side and the operating side after the measurement is finished to finish the zero point calibration of the knife roll gap;
2) determining the coating speed and starting the machine;
3) preliminarily setting a knife roll gap according to the surface density and empirical values of production requirements, and coating the coating test piece;
4) adjusting the gap of the knife roll according to the surface density deviation of the coated test piece, and if the surface density of the test piece is smaller, increasing the gap of the knife roll; if the surface density of the test piece is larger, the gap between the knife rolls is reduced;
5) and (4) manufacturing the coating test piece again, adjusting the gap of the knife roller according to the surface density deviation of the coating test piece, repeatedly debugging until the surface density of the coating test piece is qualified and approaches to the required median value, and starting formal production.
However, even after the surface density is debugged to be qualified by adopting the above operation, the coating surface density fluctuation still often occurs in the normal production process of the transfer coating, so that the product consistency is poor, even the pole piece is scrapped due to the over-poor surface density, and the problem of battery safety failure can be further caused.
When the surface density fluctuates in the existing transfer coating process, the surface density can only be passively monitored, then the gap between the knife rolls is manually adjusted, the whole process is relatively passive and lagged, and the fluctuation of the surface density cannot be predicted and intervened in advance.
Disclosure of Invention
An object of the present invention is to provide a coating surface density control device which can avoid fluctuation of the coating surface density.
The coating surface density control device for achieving the purpose is used for a coating machine, the coating machine comprises a scraper roller and a coating roller, and the coating surface density control device comprises a gap adjusting device, a temperature measuring device and a control unit; the gap adjusting device is used for adjusting the gap between the scraper roller and the coating roller; the temperature measuring device is used for detecting temperature and providing a first detection signal and a second detection signal; the control unit is used for receiving the first detection signal and the second detection signal, comparing the first detection signal and the second detection signal, calculating the variation of the gap according to the comparison result, and controlling the gap adjusting device to compensate the gap according to the variation of the gap.
In one or more embodiments of the coating areal density control device, the temperature measurement device is configured to provide the first detection signal at a first time and the second detection signal at a second time.
In one or more embodiments of the coating areal density control device, the first detection signal is an initial temperature of the coating roll and the second detection signal is a real-time temperature of the coating roll.
In one or more embodiments of the coating areal density control device, the temperature measurement device comprises a first temperature measurement device for providing the first detection signal and a second temperature measurement device for providing the second detection signal.
In one or more embodiments of the coating area density control device, the coater further includes a slurry tank, the first detection signal is a temperature of the coating roller, and the second detection signal is a temperature of slurry in the slurry tank.
In one or more embodiments of the coating areal density control device, the control unit further comprises a display device for displaying the comparison result.
The coating surface density control device predicts or calculates the change of the gap between the scraper roller and the coating roller in real time in advance in a temperature feedback mode and compensates and adjusts the gap, so that the automatic adjustment control of the surface density can be effectively realized, the stability of the gap between the scraper roller and the coating roller is ensured, the fluctuation of the surface density is eliminated, the performance and the safety of a battery are improved, and the coating surface density control device has the advantages of simple structure, convenience in manufacturing, lower cost and convenience in operation.
Another object of the present invention is to provide a coater which can avoid fluctuation in coating areal density.
The coating machine for realizing the purpose comprises the coating surface density control device.
This coating machine passes through the mode of temperature feedback, predicts in advance or real-time calculation the change in the clearance between scraper roller and the coating roller to compensate the regulation to this clearance, thereby can realize the automatically regulated control of surface density effectively, guarantee that the clearance between scraper roller and the coating roller is stable, in order to eliminate the surface density fluctuation, improve the performance and the security of battery, and this coating machine's simple structure, the manufacturing of being convenient for, the cost is lower, the simple operation.
It is still another object of the present invention to provide a coating areal density control method which can avoid fluctuations in coating areal density.
To achieve the object, a coating surface density control method for controlling the coating surface density of a coater including a doctor roll and a coating roll, the coating surface density control method comprising: acquiring a first detection signal and a second detection signal, wherein the first detection signal and the second detection signal are temperature detection signals; comparing the first detection signal with the second detection signal, and calculating the variation of the gap between the doctor roller and the coating roller according to the comparison result; and compensating the clearance according to the variation of the clearance.
In one or more embodiments of the method for controlling coating areal density, the first detection signal is an initial temperature of the coating roll, the second detection signal is a real-time temperature of the coating roll, and the method for controlling coating areal density calculates a real-time value of a change amount of the gap based on a temperature difference between the real-time temperature and the initial temperature, and compensates the gap based on the real-time value.
In one or more embodiments of the method for controlling coating areal density, the coater further includes a slurry tank, the first detection signal is a temperature of the coating roll, the second detection signal is a temperature of slurry in the slurry tank, and the method for controlling coating areal density predicts a change curve of a change amount of the gap with time from a temperature difference between the slurry and the coating roll, and compensates the gap according to the change curve.
The coating surface density control method predicts or calculates the change of the gap between the scraper roller and the coating roller in real time in advance in a temperature feedback mode, and compensates and adjusts the gap, so that the automatic adjustment control of the surface density can be effectively realized, the stability of the gap between the scraper roller and the coating roller is ensured, the surface density fluctuation is eliminated, and the performance and the safety of the battery are improved.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a part of a coater of a certain type.
Fig. 2 is a schematic illustration of the effect of temperature change of the applicator roll on the gap between the doctor roll and the applicator roll.
FIG. 3 is a graphical illustration of the areal density distribution of a comparative experiment demonstrating the effect of temperature on areal density.
Fig. 4 is a schematic view of a partial structure of a coater according to example 1.
Fig. 5 is a schematic view of a partial structure of a coater according to example 2.
Fig. 6 is a schematic flow chart of a coating areal density control method according to example 3.
Fig. 7 is a schematic flow chart of a coating areal density control method according to example 4.
Detailed Description
The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and do not limit the scope of the invention. It is to be noted that the drawings are designed solely as examples and are not to scale and should not be construed as limiting the scope of the invention as it may be practiced. Furthermore, some of the features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
The main structure and operation principle of a certain type of transfer coater 100 are shown in fig. 1, the coater 100 includes a doctor roll 1, a coating roll 2, a backing roll 3 and a slurry tank 4, during the coating process, a substrate 200 for preparing pole pieces is located between the coating roll 2 and the backing roll 3, the substrate 200 is attached to the backing roll 3 and is transported by the rotation of the backing roll 3, slurry 5 in the slurry tank 4 is transferred to the substrate 200 under the driving of the coating roll 2 for coating, the slurry 5 passes through the doctor roll 1 before being transferred to the substrate 200 on the coating roll 2, the cross section of the doctor roll 1 is generally comma-shaped, the transfer coating amount of the slurry 5 can be controlled by adjusting a gap G between the doctor roll 1 and the coating roll 2, so as to control the coating surface density, and the excessive slurry 5 is scraped to flow back by the doctor roll 1. Generally, the doctor roll 1 and the coating roll 2 are made of steel, and the backing roll 3 is made of rubber.
The inventor finds that the temperature change of the coating roller 2 is the main reason causing the fluctuation of the coating surface density in the process of implementing the invention. Referring to fig. 1 and 2, according to the working principle of transfer coating, the surface density in the coating process is mainly controlled by the gap G between the doctor roll 1 and the coating roll 2, so that it is difficult to avoid temperature fluctuation of slurry batches in production and ensure absolute stability of the temperature of the production environment, and if there is a temperature difference between the slurry 5 and the coating roll 2, the temperature of the coating roll 2 is inevitably changed in the coating process, which causes thermal expansion and contraction of the coating roll 2, and further changes the gap G between the doctor roll 1 and the coating roll 2.
In order to verify the mechanism that the surface density is affected by the temperature change of the coating roller 2, the inventor theoretically calculates the surface density change amount caused by the expansion and contraction of the coating roller 2, and verifies the theoretical calculation result through a comparative test.
The comparative test was conducted using the same tank of slurry 5 and the same coater 100 under three sets of test conditions and tested for areal density variation, as shown in fig. 3. The three sets of test conditions were as follows:
(a) under the condition that the temperature of the coating roller 2 is stable and unchanged, the temperature of the slurry 5 is adjusted to be 4 ℃ higher than the temperature of the coating roller 2, namely the total temperature change delta T of the coating roller 2 in the coating process is 4 ℃;
(b) under the condition that the temperature of the coating roller 2 is stable and unchanged, the temperature of the slurry 5 is adjusted to be 2 ℃ lower than that of the coating roller 2, namely the total temperature change delta T of the coating roller 2 in the coating process is-2 ℃;
(c) under the condition that the temperature of the coating roller 2 is stable and unchanged, the temperature of the slurry 5 is adjusted to be equivalent to the temperature of the coating roller 2, namely the total temperature change Delta T of the coating roller 2 in the coating process is less than 1 ℃.
The ratio of the surface density test results to the theoretical calculated values under the above three sets of test conditions is shown in table 1:
TABLE 1 Table for comparing the results of the test of the influence of temperature on the areal density with the theoretical values
| Group of | Temperature difference | Test results | Theoretical influence | Whether or not to coincide with |
| (a) | +4℃ | The surface density is reduced by 2.31 percent | The surface density is reduced by 2.52 percent | Substantially coincide with |
| (b) | －2℃ | The surface density is increased by 1.04 percent | The increase of the areal density is 1.26 percent | Substantially coincide with |
| (c) | ＜1℃ | Stable surface density | The surface density fluctuation is less than 0.63 percent | Substantially coincide with |
The following illustrates a theoretical calculation method of the amount of change in areal density caused by thermal expansion and contraction of the coating roller 2:
1. calculating the initial gap G between the doctor roll 1 and the coating roll 2 according to the set surface density of the comparative test1：
Typically, the gap G between the doctor roll 1 and the coating roll 2 is approximately equal to the thickness of the wet film being coated, and the initial gap G between the doctor roll 1 and the coating roll 2 is then1The calculation formula of (2) is as follows:
G1about area density/slurry solids content/slurry density (1)
For example, the comparative test was conducted to set the coating areal density at 185g/m2The solid content of the adopted slurry 5 is 70%, the density of the slurry is 2.3G/ml, and the initial gap G can be calculated by substituting the formula (1)1114.9 μm; for ease of operation, the calculation of equation (1) can be used as the initial gap G in the comparative experiment1In the actual production process, the production and coating tests are requiredSheet-like to the initial gap G1Adjusting;
2. referring to fig. 2, when the temperature of the slurry 5 is higher than the temperature of the coating roll 2, resulting in a total amount of temperature change Δ T of the coating roll 2 during the coating process, the initial diameter D of the coating roll 21After thermal expansion due to temperature increase, the diameter of the applicator roll 2 is increased to D2Resulting in a reduction of the gap G between the doctor roll 1 and the coating roll 2 to G2Then, the calculation formula of the variation Δ G of the gap G between the doctor roll 1 and the coating roll 2 is:
△G＝G2-G1＝－(D2-D1)/2＝－D1*α*△T/2 (2)
wherein alpha is the thermal expansion coefficient (linear expansion coefficient) of the coating roller 2, and when the material of the coating roller 2 is steel, alpha is approximately equal to 12 multiplied by 10-6The initial diameter D of the coating roller 2 of the comparative test is slightly different in the value of the thermal expansion coefficient of different steel materials due to different specific components1Assuming that the total amount of temperature change Δ T of the coating roller 2 during coating is 1 ℃ and Δ G ≈ 0.72 μm by substituting the formula (2), the amount of change in the area density due to the temperature change of the coating roller 2 is as follows:
change in areal density ═ Δ G/G1＝－0.72μm/114.9μm≈－0.63％ (3)
I.e., the temperature of the slurry 5, results in a reduction of the areal density by about 0.63% for every 1 c higher than the temperature of the coating roll 2, and similarly theoretical values of the variation in areal density under the above three sets of test conditions can be obtained.
According to the mechanism, the coater 100, the coating surface density control device 6 and the coating surface density control method according to one or more embodiments of the present invention compensate the gap G between the doctor roll 1 and the coating roll 2 in a temperature feedback manner, so as to realize automatic adjustment and control of the surface density and eliminate fluctuation of the surface density.
Example 1:
referring to fig. 4, a coater 100 according to embodiment 1 of the present invention includes a doctor roll 1, a coating roll 2, a backing roll 3, a slurry tank 4, and a coating surface density control device 6.
The coating surface density control device 6 includes a gap adjusting device 60, a temperature measuring device 61, and a control unit 62.
The gap adjusting device 60 is used to adjust the gap G between the doctor roll 1 and the applicator roll 2. For example, the gap adjusting device 60 includes a motor (not shown) in signal connection with the control unit 62 for driving the transmission mechanism under the control of the control unit 62, and a transmission mechanism (not shown) which may be a ball screw or other transmission mechanism for driving the doctor roller 1 to move relative to the coating roller 2 under the driving of the motor, thereby adjusting the gap G between the doctor roller 1 and the coating roller 2.
The temperature measuring device 61 is used for detecting the temperature of the coating roller 2, and for example, a contact type temperature measuring sensor, an induction type temperature measuring sensor, or other temperature measuring elements are used. The temperature measuring device 61 provides a first detection signal at a first time and a second detection signal at a second time, for example, the first detection signal is the initial temperature of the coating roller 2 before the coating process starts, and the second detection signal is the real-time temperature of the coating roller 2 during the coating process.
The control unit 62 is in signal connection with the temperature measuring device 61, the control unit 62 is used for receiving the first detection signal and the second detection signal, comparing the first detection signal and the second detection signal, calculating a real-time value of a variation quantity delta G of the gap G caused by the thermal expansion and the cold contraction of the coating roller 2 according to a comparison result, and controlling the gap adjusting device 60 to compensate the gap G according to the real-time value, so that the gap G is maintained as an initial gap G1For details, see the following.
Optionally, the control unit 62 is further configured to output the comparison result of the first detection signal and the second detection signal, for example, by screen display, or by printing, or by other means, for recording and reference by the testing personnel.
The control unit 62 includes one or more hardware processors such as one or more combinations of microcontrollers, microprocessors, Reduced Instruction Set Computers (RISC), Application Specific Integrated Circuits (ASIC), Application Specific Integrated Processors (ASIP), Central Processing Units (CPU), Graphics Processing Units (GPU), Physical Processing Units (PPU), microcontroller units, Digital Signal Processors (DSP), Field Programmable Gate Arrays (FPGA), Advanced RISC Machines (ARM), Programmable Logic Devices (PLD), any circuit or processor capable of performing one or more functions, and the like.
Example 2:
a coater 100 according to embodiment 2 of the present invention is shown in fig. 5, and this embodiment follows the reference numerals and parts of the contents of the foregoing embodiments, wherein the same reference numerals are used to designate the same or similar elements, and the description of the same technical contents is optionally omitted. For the description of the omitted parts, reference may be made to the foregoing embodiments, which are not repeated herein.
The main difference between embodiment 2 and embodiment 1 is that the temperature measuring device 61 of embodiment 2 includes a first temperature measuring device 611 and a second temperature measuring device 612, and the control unit 62 includes a controller 621 and a display device 622.
The first temperature measuring device 611 and the second temperature measuring device 612 are used to provide a first detection signal and a second detection signal, respectively, for example, the first detection signal is the temperature of the coating roller 2, and the second detection signal is the temperature of the slurry 5 in the slurry tank 4.
The display device 622 is in signal connection with the controller 621, the first temperature measuring device 611 and the second temperature measuring device 612, the display device 622 is used for receiving the first detection signal and the second detection signal, comparing the first detection signal and the second detection signal and displaying a comparison result, namely, a temperature difference between the slurry 5 and the coating roller 2, so that a tester can record and refer to the temperature difference, and the display device 622 is also used for sending the comparison result of the first detection signal and the second detection signal to the controller 621.
The controller 621 is configured to predict a time-dependent change curve of the change amount Δ G of the gap G caused by thermal expansion and contraction of the coating roller 2 based on the comparison result, and control the gap adjusting device 60 to compensate the gap G based on the change curve, thereby maintaining the gap G as the initial gap G1For details, see the following.
Therefore, the coater 100 and the coating surface density control device 6 according to one or more embodiments of the present invention predict or calculate in real time the change of the gap G between the doctor roll 1 and the coating roll 2 in advance in a temperature feedback manner according to the transfer coating principle and the aforementioned mechanism that the temperature affects the surface density, and perform compensation adjustment on the gap G, thereby effectively realizing automatic adjustment control of the surface density, ensuring the stable gap between the doctor roll 1 and the coating roll 2, eliminating the surface density fluctuation, and improving the performance and safety of the battery, and the coater 100 and the coating surface density control device 6 have simple structures, are convenient to manufacture, have low cost, and are convenient to operate.
Example 3:
the main steps of the coating areal density control method according to embodiment 3 of the invention are described below with reference to fig. 6:
s1, before the coating process is started, adjusting the initial gap G between the doctor roll 1 and the coating roll 21To meet the production requirements, the initial diameter D of the coating roller 2 is measured1And an initial temperature;
s2, starting coating, measuring the temperature of the coating roller 2 in real time in the coating process, and comparing the initial temperature and the real-time temperature of the coating roller 2, namely calculating the real-time temperature variation Delta T' of the coating roller 2;
s3, according to the initial diameter D of the coating roller 21Calculating a real-time value of the variation delta G of the gap G between the doctor roll 1 and the coating roll 2 caused by the expansion with heat and the contraction with cold of the coating roll 2 by using the real-time temperature variation delta T' and the formula (2);
s4, moving the doctor roll 1 according to the real-time value to compensate for the gap G so as to maintain the gap G as the initial gap G1。
Example 4:
the main steps of the coating areal density control method according to embodiment 4 of the invention are described below with reference to fig. 7:
s1', before the coating process is started, the initial gap G between the doctor roll 1 and the coating roll 2 is adjusted1To meet the production requirements, the initial diameter D of the coating roller 2 is measured1The initial temperature of the applicator roll 2 and the temperature of the slurry 5 in the slurry tank 4;
s2', comparing the initial temperature of the coating roller 2 with the temperature of the slurry 5 in the slurry tank 4, calculating the temperature difference between the initial temperature and the temperature of the coating roller 2 to obtain the total quantity delta T of the temperature change of the coating roller 2 in the coating process, and setting the time length required by the coating roller 2 and the slurry 5 to reach the isothermal temperature according to the empirical value, wherein the time length is the compensation time T;
s3', according to the initial diameter D of the coating roller 21Predicting a time-dependent change curve of a change quantity delta G of a gap G between the doctor roll 1 and the coating roll 2 caused by thermal expansion and contraction of the coating roll 2, wherein the total quantity delta T of temperature change, the compensation time T and the formula (2) are shown;
s4', start coating, and gradually move the doctor roll 1 according to the change curve to compensate the gap G for the compensation time t, thereby maintaining the gap G as the initial gap G1。
Therefore, according to the coating surface density control method of one or more embodiments of the invention, according to the transfer coating principle and the mechanism of the temperature influencing the surface density, the change of the gap G between the doctor roller 1 and the coating roller 2 is predicted in advance or calculated in real time in a temperature feedback mode, and the gap G is compensated and adjusted, so that the automatic adjustment control of the surface density can be effectively realized, the stability of the gap between the doctor roller 1 and the coating roller 2 is ensured, the surface density fluctuation is eliminated, and the performance and the safety of the battery are improved.
Optionally, the coating areal density control method further comprises correcting for deviations between theoretical and actual values using a compensation factor, including but not limited to deviations due to differences in the actual coefficients of thermal expansion of the different gauge coating rolls 2. For example, the value range of the compensation coefficient is 0.5-1.5, the initial value is set to 1, and the value of the compensation coefficient is corrected according to the test result in the actual use process, so that the accuracy of the automatic adjustment control of the surface density is further improved, and the stability of the surface density is improved.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.
Claims (10)
1. Coating surface density control device for coating machine, the coating machine comprises a doctor roller and a coating roller, and is characterized in that the coating surface density control device comprises:
the gap adjusting device is used for adjusting the gap between the scraper roller and the coating roller;
the temperature measuring device is used for detecting temperature and providing a first detection signal and a second detection signal;
and the control unit is used for receiving the first detection signal and the second detection signal, comparing the first detection signal and the second detection signal, calculating the variation of the gap according to the comparison result, and controlling the gap adjusting device to compensate the gap according to the variation of the gap.
2. A coated surface density control device as claimed in claim 1 wherein the temperature measuring means is arranged to provide the first detection signal at a first time and the second detection signal at a second time.
3. The coated surface density control device of claim 2, wherein the first detection signal is an initial temperature of the coating roll and the second detection signal is a real-time temperature of the coating roll.
4. The coated surface density control device of claim 1, wherein the temperature measuring device comprises a first temperature measuring device for providing the first detection signal and a second temperature measuring device for providing the second detection signal.
5. The coating area density control device according to claim 4, wherein the coater further comprises a slurry tank, the first detection signal is a temperature of the coating roll, and the second detection signal is a temperature of slurry in the slurry tank.
6. The coated surface density control device according to any one of claims 1 to 5, wherein the control unit further comprises a display device for displaying the comparison result.
7. A coater comprising the coating areal density control device according to any one of claims 1 to 6.
8. A coating surface density control method for controlling the coating surface density of a coater including a doctor roll and a coating roll, characterized in that the coating surface density control method comprises:
acquiring a first detection signal and a second detection signal, wherein the first detection signal and the second detection signal are temperature detection signals;
comparing the first detection signal with the second detection signal, and calculating the variation of the gap between the doctor roller and the coating roller according to the comparison result;
and compensating the clearance according to the variation of the clearance.
9. The method of claim 8, wherein the first detection signal is an initial temperature of the coating roll, the second detection signal is a real-time temperature of the coating roll, and the method of controlling the coating areal density calculates a real-time value of the amount of change of the gap based on a temperature difference between the real-time temperature and the initial temperature, and compensates for the gap based on the real-time value.
10. The coating areal density control method of claim 8, wherein the coater further comprises a slurry tank, the first detection signal is a temperature of the coating roll, the second detection signal is a temperature of slurry in the slurry tank, and the coating areal density control method predicts a change curve of a change amount of the gap with time based on a temperature difference between the slurry and the coating roll, and compensates for the gap based on the change curve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115970971A (en) * | 2022-12-13 | 2023-04-18 | 重庆太蓝新能源有限公司 | Coating apparatus and coating method |
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