CN114570773B - Pole piece extension consistency control method and control system - Google Patents
Pole piece extension consistency control method and control system Download PDFInfo
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- CN114570773B CN114570773B CN202210219305.6A CN202210219305A CN114570773B CN 114570773 B CN114570773 B CN 114570773B CN 202210219305 A CN202210219305 A CN 202210219305A CN 114570773 B CN114570773 B CN 114570773B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 84
- 238000005096 rolling process Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 11
- 239000011888 foil Substances 0.000 abstract description 17
- 238000005452 bending Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000283070 Equus zebra Species 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 238000012795 verification Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- H—ELECTRICITY
- 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
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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- H—ELECTRICITY
- 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
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
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- H—ELECTRICITY
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a pole piece extension consistency control method and a pole piece extension consistency control system, wherein the system comprises a code spraying device, a first camera, a second camera, a third camera and a PLC (programmable logic controller) which are sequentially arranged along the tape running direction of a pole piece, a code spraying port of the code spraying device is vertically downward and is opposite to the upper surface of the pole piece to be fed into a front roller, lenses of the first camera, the second camera and the third camera are vertically downward and are sequentially positioned between the front roller and a front tension roller, between the front tension roller and upper and lower rollers and between the rear tension roller and a rear roller; the PLC receives image information collected by the first camera, the second camera and the third camera to identify the code spraying position of the upper surface of the pole piece, judges the extension state of the pole piece in real time and sends a control instruction; and the pole piece rolling tension control system adjusts the tensile tension according to the control instruction to keep the pole piece in a consistent state of extension. The invention can ensure that the tab area is fully extended, and avoid the problem that the tab area is not fully extended to cause the snakelike bending of a pole piece or the foil area is wrinkled due to the over-stretching of the tab.
Description
Technical Field
The invention relates to the technical field of lithium battery pole piece rolling, in particular to a pole piece extension consistency control method and a pole piece extension consistency control system in a rolling process.
Background
In the manufacturing process of the lithium battery, after the pole pieces are coated, main material particles are in a free stacking state, the energy density of the pole pieces is small and does not meet industrial requirements, the compacted density of the pole pieces needs to be improved in a roller pressurizing mode, and foil materials are stressed and stretched in the rolling process; at present, the common zebra coating pole piece has the problem of inconsistent extension after rolling due to the thickness difference between a coating area and a foil area in the rolling process, the coating area is thick and can be fully extended, and the foil area is not fully extended, so that the pole piece is wrinkled or broken.
At present, in the industry, staff use an off-line extension measurement mode through a steel ruler to realize the off-line extension measurement, and then actively stretch the pole piece foil area in a tension difference wrinkle removing mode to enable the extension to be consistent with the coating area, but the extension of the foil area and the coating area cannot be quantized in the actual production process, and the sufficient extension of the pole lug area cannot be guaranteed, so that the problem that the pole piece is bent in a snake shape due to insufficient extension of the pole lug area or the foil area is wrinkled due to over-stretching of the pole lug often occurs.
Therefore, a method and a control system for realizing online foil extension measurement and feeding back measurement data to a tension control system for realizing closed-loop control after being integrated by a central control system are needed.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a pole piece extension consistency control method and a pole piece extension consistency control system, and aims to solve the problems that on-line foil extension measurement cannot be realized, and further pole piece extension consistency cannot be ensured.
In order to achieve the above purpose, the present invention provides a pole piece extension consistency control system, which is characterized in that the method comprises the following steps:
s1, controlling a code spraying device to spray codes on the upper surface of a pole piece, wherein the code spraying 1 is produced on the pole piece, the pole piece is conveyed forward in a roll-passing direction, and a coder of a pole piece rolling tension control system records the code spraying position of the pole piece;
s2, when the distance between the tape-walking distance of the pole piece and the code spraying position of the pole piece is recorded in the coding mode and reaches a preset value L, controlling a code spraying device to spray codes on the upper surface of the pole piece again, and enabling the code spraying device to generate a code spraying 2 on the pole piece;
s3, collecting an image signal of a pole piece passing through a belt between a front passing roller and a front tension roller, and identifying position information of a code spraying 1 and a code spraying 2, wherein the distance between the two is a code spraying reference distance a;
s4, collecting image signals of the pole piece between the front tension roller and the upper and lower rollers, and identifying the position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a front stretching extension identification distance b;
s5, collecting an image signal of the pole piece passing through the rear tension roller and the rear passing roller, and identifying the position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a rear stretching and extending identification distance c;
s6, judging the consistency of the elongation percentage: respectively calculating the front extensibility delta of the pole piece Before t = (b-a)/a, post-pole piece elongation delta After t = c-a/a and is compared with a predetermined standard pre-elongation rate δ Front side Standard post-elongation delta Rear end Carrying out comparison;
s7, controlling the consistency of the elongation rate: when delta Before t >δ Front side When the tension is reduced, the tension control system for rolling pole piece reduces the tension of the front tension roller, and when delta is equal to delta Before t <δ Front part When the tension control system is used for adjusting the tension of the pole piece rolling tension control system, the tension of the front tension roller is lifted; when delta After t >δ Rear end When the tension control system adjusts the rolling tension of the pole piece to reduce the stretching tension of the rear tension roll, when delta After t <δ Rear end And adjusting the pole piece rolling tension control system to improve the tensile tension of the rear tension roll.
Preferably, the position information of the code-spraying 1 and the code-spraying 2 in the steps S3, S4 and S5 is accurately identified by a CCD camera, and the specific process is as follows: the method comprises the steps of collecting image signals of the traveling of the pole piece through a CCD camera, accumulating pixel points in the length measurement mode of the CCD camera, shooting and recording the number of the pixel points from a starting point to an end point through the camera, and calculating the required length.
Preferably, in the steps S1 and S2, code spraying is simultaneously carried out on the left side and the right side of the pole piece respectively; and step S3, step S4 and step S5, respectively identifying the position information of the left and right code spraying, respectively calculating the extension rates of the left side and the right side of the pole piece, and judging the extension consistency of the left side and the right side by comparison.
Preferably, the stretching tension adjustment is realized by respectively controlling the left linear motor and/or the right linear motor of the front tension roller and the rear tension roller according to the calculated extension rates of the left side and the right side of the pole piece.
The invention also provides a pole piece extension consistency control system which is characterized by comprising a code spraying device, a first camera, a second camera, a third camera and a PLC (programmable logic controller), wherein the code spraying device, the first camera, the second camera, the third camera and the PLC are sequentially arranged along the tape travelling direction of the pole piece;
the code spraying port of the code spraying device is vertically downward and is opposite to the upper surface of the pole piece to be fed into the front roller, and the lenses of the first camera, the second camera and the third camera are vertically downward and are sequentially positioned between the front roller and the front tension roller, between the front tension roller and the upper and lower rollers and between the front tension roller and the rear roller;
the PLC receives image information collected by the first camera, the second camera and the third camera to identify the code spraying position of the upper surface of the pole piece so as to judge the extension state of the pole piece in real time and send a control instruction to the pole piece rolling tension control system according to the extension state of the pole piece;
and the pole piece rolling tension control system adjusts the tensile tension according to the control instruction so as to keep the extension consistency state of the pole piece.
Preferably, the PLC calculates the elongation of the pole piece, adjusts the pole piece rolling tension control system to reduce the stretching tension when the elongation is larger than a preset value, and adjusts the pole piece rolling tension control system to increase the stretching tension when the elongation is smaller than the preset value.
Preferably, the pole piece rolling tension control system comprises an encoder and a linear motor, the encoder records the pole piece strip length and sends the pole piece strip length to the PLC, and the linear motor adjusts the gap of the tension roller according to a control command sent by the PLC, so that the tension of the tension roller is adjusted.
Preferably, the PLC controls the code spraying device to spray codes to the pole piece twice, controls image information collected by the first camera, the second camera and the third camera to identify the length of the interval between the two sprayed codes on the upper surface of the pole piece, and sends a control instruction to the linear motor according to the calculated extension rate.
Preferably, linear electric motor is including setting up respectively in the left linear electric motor of preceding tension roller left and right sides, set up respectively in the left linear electric motor of back tension roller left and right sides, left linear electric motor and right linear electric motor are used for controlling tension roller left side tension size, right side tension size respectively to adjust the percentage elongation on pole piece left side, right side respectively.
Preferably, the first camera, the second camera and the third camera are CCD high-speed cameras.
Compared with the prior art, the invention has the beneficial effects that:
1. the pole piece extension consistency control system is arranged, so that huge workload generated by manual off-line extension measurement is saved;
2. the original manual measurement adopts a steel ruler as a measuring tool, the precision of the steel ruler is 0.5mm, a pole piece extension consistency control system identifies and measures the reference through an image, the identification precision can reach 0.1mm, and the precision is 5 times of the former precision;
3. the invention can ensure that the tab area is fully extended, and avoid the problem that the tab area is not fully extended to cause the snake-shaped bending of the pole piece or the foil area is wrinkled due to the over-stretching of the tab;
4. the pole piece extension consistency control system provided by the invention forms tension closed-loop control through primary closed-loop control, and ensures that the extension of the left side and the extension of the right side are consistent through secondary closed-loop control.
Drawings
FIG. 1 is a block diagram of a pole piece extension consistency control system according to the present invention.
FIG. 2 is a schematic diagram illustrating a control principle of a pole piece extension consistency control system according to the present invention.
Fig. 3 is a schematic diagram of the left and right stretch control of the present invention.
Fig. 4 is a schematic diagram of the motor arrangement structure for left and right extension control according to the present invention.
Fig. 5 is a schematic diagram of a camera recognizing a distance between two code spurts.
Fig. 6 is a schematic diagram of a pole piece code spraying structure in embodiment 2.
Fig. 7 is a schematic diagram of a pole piece code spraying structure in embodiment 4.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples, which should not be construed as limiting the invention.
The pole piece extension consistency control system provided by the invention comprises a code spraying device 1, a first camera 4, a second camera 6, a third camera 10 and a PLC12 which are sequentially arranged along the tape moving direction of a pole piece 2, wherein the control ends of the code spraying device 1, the first camera 4, the second camera 6 and the third camera 10 are all connected with the PLC12, and the PLC12 is connected with a pole piece rolling tension control system. The code spraying port of the code spraying device 1 is vertically downward and is opposite to the upper surface of the pole piece 2 which is ready to enter the front roller 3, and the lenses of the first camera 4, the second camera 6 and the third camera 10 are vertically downward and are sequentially positioned between the front roller 3 and the front tension roller 5, between the front tension roller 5 and the upper and lower rollers, and between the rear tension roller 9 and the rear roller 11.
Example one
The embodiment is a pole piece extension consistency control system for realizing on-line extension primary closed-loop control. As shown in fig. 1 and fig. 2, the PLC12 controls the code sprayer 1 to spray a code to the pole piece 2, the code is recorded as a code spraying 1, the mode of spraying the code with ink is used as a sampling reference, meanwhile, the PLC12 controls the encoder to record the length of the belt of the pole piece 2, a feedback signal is sent to the PLC12 until the length of the belt recorded by the encoder reaches a preset value L, and at this time, the PLC12 controls the code sprayer 1 to spray a code to the pole piece 2, and the code is recorded as a code spraying 2. Image information respectively acquired by the first camera 4, the second camera 6 and the third camera 10 identifies the distance between the code spraying 1 and the code spraying 2 on the upper surface of the pole piece 2 so as to judge the pole piece extension state in real time, online measurement data is fed back to the PLC12, online actual measurement extension is obtained through operation by the PLC12, a signal is fed back to a pole piece rolling tension control system through control logic according to the pole piece extension state, and the tension is adjusted to form closed-loop control; and the pole piece rolling tension control system adjusts the tensile tension according to the control instruction so as to keep the extension consistency state of the pole piece 2. . The pole piece tension control system of one-level closed-loop control comprises a CCD, a front tension driving roller and a rear tension driving roller, the CCD records the tape running length of a pole piece and sends the tape running length to a PLC12, the PLC12 calculates the extension rate of the pole piece 2, tension control is completed through the speed difference between the driving rollers, the rotating speed of the front stretching roller is V1, the rotating speed of a roller is V2, the rotating speed of the rear stretching roller is V3, front stretching is controlled through the speed difference of V2-V1, and rear stretching is controlled through the speed difference of V3-V2.
When the extensibility is larger than the preset value, the tension control system can reduce the driving speed of the rear part to achieve the effect of reducing the extensibility, and vice versa.
Example two
The embodiment is a pole piece extension consistency control method for realizing on-line extension primary closed-loop control, which comprises the following steps:
s1, controlling a code spraying device 1 to spray a code on the upper surface of a pole piece 2 by using ink, wherein the code spraying device 1 is produced on the pole piece 2, the pole piece 2 is carried forward in the direction of a roller 3, and a code spraying position of the pole piece is recorded by a coder of a pole piece rolling tension control system;
s2, when the distance between the tape-travelling distance of the pole piece and the code spraying position of the pole piece is recorded by coding and reaches a preset value L, controlling the code sprayer 1 to spray codes on the upper surface of the pole piece 2 again, and generating the code spraying 2 on the pole piece 2;
s3, a first camera 4 collects a traveling image signal of the pole piece 2 passing through the space between the front passing roller 3 and the front tension roller 5, and identifies the position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a code spraying reference distance a;
s4, a second camera 6 collects image signals of the pole piece 2 passing through the front tension roller 5 and between the upper roller and the lower roller, and identifies the position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a front stretching extension identification distance b;
s5, a third camera 10 collects image signals of the pole piece 2 passing through a space between the rear tension roller 9 and the rear passing roller 11, and identifies position information of the code spraying 1 and the code spraying 2, wherein the space between the two is a rear stretching and extending identification space c;
s6, judging the consistency of the elongation percentage: respectively calculating the front extensibility delta of the pole piece Before t = (b-a)/a, pole piece rear elongation delta After t = c-a/a and is compared with a predetermined standard pre-elongation rate δ Front side Standard post-elongation delta Rear end Carrying out comparison;
s7 elongation rate is uniformSex control: when delta Before t >δ Front side When the tension control system for rolling pole piece is adjusted to reduce the tensile tension of the front tension roller 5, when delta is delta Before t <δ Front side When the tension control system is used for adjusting the rolling tension of the pole piece, the stretching tension of the front tension roller 5 is lifted; when delta After t >δ Rear end When the tension is reduced, the tension control system for rolling the pole piece is adjusted to reduce the tension of the rear tension roll 9, and when delta is obtained After t <δ Rear end And meanwhile, the pole piece rolling tension control system is adjusted to improve the tensile tension of the rear tension roll 9.
The first camera 4, the second camera 6 and the third camera 10 are all CCD high-definition cameras, and the method for identifying the position information of the code spraying 1 and the code spraying 2 comprises the following steps: the CCD length measurement implementation mode is pixel point accumulation, and the required length is calculated by shooting and recording the number of pixel points from the starting point to the end point through a camera. The measurement mode is as follows:
as shown in fig. 5, lenses are arranged in front of the first camera 4, the second camera 6 and the third camera 10, the distance from the electrode to be measured to the lens is an object distance, the distance from the lens to the CCD lens is an image distance, u represents the object distance, v represents the image distance, f represents the focal length of the lens, n represents the number of pixels, p represents the pixel width, L represents the length of the material to be measured, and β represents the imaging magnification.
According to the imaging formula:
1/u+1/v＝1/f (1)
β＝v/u＝np/L (2)
the measured size can be obtained by the formulas (1) and (2):
L＝np/β＝(u/f-1)*n*p (3)
when the distance from the measured pole piece to the lens is far larger than the distance from the lens to the CCD lens, namely the object distance u > the image distance f, the measured size can be changed as follows:
L＝u*n*p/f (4)
according to the formula, the distance between the two code spraying codes can be calculated according to the number of the pixel points between the code spraying 1 and the code spraying 2. The measured size precision is strongly related to the pixel precision of the lens, and the purpose of improving the measurement precision is achieved through the high-precision lens.
The implementation effect is as follows:
the material system is as follows: NCM622, compacted density design: 3.45g/cc
Thickness of aluminum foil: 12um
Pole piece structure: as shown in figure 6, the code spraying position is 6mm of ceramic and 170mm of coating on the aluminum foil on one side of the pole piece
The tension of the front tension roller is set: 50N, pre-set standard pre-elongation delta Front side ：2.1‰
And (3) setting the tension of the rear tension roll: 140N, pre-set standard post-elongation delta Rear end ：7‰
The extension test data is shown in table 1:
TABLE 1
As can be seen from the data, the online extension closed loop can control the fluctuation of the extension rate to be +/-0.1%, and the subsequent extension consistency fluctuation range can be improved to be +/-0.05% through the verification and tension precision improvement.
EXAMPLE III
In this embodiment, for realizing the pole piece extension consistency control system of the online extension secondary closed-loop control, compared with the first embodiment, the linear motors arranged in this embodiment include the left linear motor 13 and the right linear motor 14 respectively arranged at the left and right sides of the front tension roller 5, and the left linear motor 13 and the right linear motor 14 respectively arranged at the left and right sides of the rear tension roller 9, as shown in fig. 4, the left linear motor 13 and the right linear motor 14 are respectively used for controlling the left tension and the right tension of the tension roller, so as to respectively adjust the extension rates of the left side and the right side of the pole piece 2. The PLC12 compares the extension difference of the left side and the right side of the foil, and feeds back signals to the linear motor through control logic, the gap of the tension roller is adjusted through the linear motor, the tension of the left side and the right side is changed through gap adjustment, and then the extension amount of the left side and the right side is adjusted to complete secondary closed-loop control.
Example four
The embodiment is a pole piece extension consistency control system for realizing on-line extension secondary closed-loop controlThe logic of the extension measurement is the same as that of the embodiment, and the difference is that the code spraying devices are respectively added on the left side and the right side of the foil, and the extension delta of the left side and the extension delta of the right side are simultaneously measured by the CCD Left side of And delta Right side And then a linear motor is additionally arranged on the tension roller. The linear motor is used for adjusting the gap between the tension clamping rollers and controlling the tension of the left side and the right side of the tension clamping rollers by adjusting the gap so as to balance the left and right extension consistency of the foil, and compared with the two embodiments, the two embodiments respectively and simultaneously code-spray the left side and the right side of the pole piece 2 in the steps S1 and S2; and step S3, step S4 and step S5, respectively identifying the position information of the left and right code spraying, respectively calculating the extension rates of the left side and the right side of the pole piece 2, and judging the extension consistency of the left side and the right side by comparison.
The overall extension consistency control logic is the same as the embodiment, and the difference is that the left and right extension rates and the closed-loop control (double closed-loop control system) of the left and right linear motors are increased. And respectively controlling a left linear motor 13 and/or a right linear motor 14 of the front tension roller 5 and the rear tension roller 9 according to the calculated elongation rates of the left side and the right side of the pole piece 2 to realize tension adjustment.
When delta is detected Left side of Or delta Right side When the extension delta is designed, a signal is fed back to the linear motor, and the motor controls to increase the gap between the rollers so as to reduce the extension;
when delta is detected Left side of Or delta Right side When the design extension delta is less than the design extension delta, the signal is fed back to the linear motor, and the motor controls to reduce the gap between the rollers so as to increase the extension;
meanwhile, the motors on the left side and the right side are respectively and independently controlled, so that the left side and the right side can be uniformly extended.
The implementation effect is as follows:
the material system is as follows: NCM622, compacted density design: 3.45g/cc
Thickness of aluminum foil: 12um
Pole piece structure: as shown in figure 7, the code spraying position is 6mm of ceramic on the aluminum foils at the two sides of the pole piece, and the coating is 170mm
Tension setting of a front tension roller: 50N, pre-set standard pre-elongation delta Front side ：2.1‰
And (3) setting the tension of the rear tension roll: 140N, preset markQuasi-rear elongation delta Rear end ：7‰
Later extension, for example, the gap is preset: 20mm
The extension test data is shown in table 2:
TABLE 2
| Test data | Left extension length | Left gap/mm | Right extension length | Right gap/mm |
| 1 | 0.711％ | 19.9 | 0.683％ | 20 |
| 2 | 0.742％ | 20 | 0.745％ | 19.8 |
| 3 | 0.726％ | 20.3 | 0.729％ | 20 |
| 4 | 0.681％ | 20.5 | 0.738％ | 20 |
| 5 | 0.767％ | 20 | 0.698％ | 19.5 |
| 6 | 0.745％ | 20.3 | 0.727％ | 19.7 |
| 7 | 0.720％ | 20.3 | 0.738％ | 19.9 |
As can be seen from the data, the online extension closed loop of the left side and the right side can be accurately adjusted, and the difference of the extension rates of the left side and the right side can control the fluctuation range +/-0.05%.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (10)
1. A pole piece extension consistency control method is characterized by comprising the following steps: the method comprises the following steps:
s1, controlling a code spraying device (1) to spray codes on the upper surface of a pole piece (2), wherein the code spraying 1 is generated on the pole piece (2), the pole piece (2) is conveyed towards a forward roller (3), and a coder of a pole piece rolling tension control system records the code spraying position of the pole piece;
s2, when the distance between the tape-moving distance of the pole piece and the code spraying position of the pole piece is recorded by the encoder to reach a preset value L, controlling the code spraying device (1) to spray codes on the upper surface of the pole piece (2) again, and generating a code spraying 2 on the pole piece (2);
s3, collecting a traveling image signal of the pole piece (2) passing through the space between the front passing roller (3) and the front tension roller (5), and identifying the position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a code spraying reference distance a;
s4, collecting image signals of the pole piece (2) passing through the front tension roller (5) and the upper and lower rollers, and identifying position information of the code spraying 1 and the code spraying 2, wherein the distance between the two is a front stretching extension identification distance b;
s5, collecting an image signal of the pole piece (2) passing through the space between the rear tension roller (9) and the rear passing roller (11), and identifying the position information of the code spraying 1 and the code spraying 2, wherein the space between the two is a rear stretching and extending identification space c;
s6, judging the consistency of the elongation rate: respectively calculating the front extensibility delta of the pole piece Before t = (b-a)/a, post-pole piece elongation delta After t = c-a/a and is compared with a predetermined standard pre-elongation rate δ Front side Standard post-elongation delta Rear end Carrying out comparison;
s7, controlling the consistency of the elongation: when delta Before t >δ Front side When the tension is adjusted, the rolling tension control system of the pole piece reduces the stretching tension of the front tension roller (5) to delta Before t <δ Front side When the pole piece rolling tension control system is used, the stretching tension of the front tension roller (5) is lifted by adjusting the pole piece rolling tension control system; when delta After t >δ Rear end When the tension is reduced, the tension control system for rolling the pole piece is adjusted to reduce the tensile tension of the rear tension roll (9), and when delta is equal to delta After t <δ Rear end And when the tension control system is adjusted to increase the tensile tension of the rear tension roller (9).
2. The method for controlling the pole piece extension consistency according to claim 1, characterized in that: the position information of the code spraying 1 and the code spraying 2 in the steps S3, S4 and S5 is accurately identified through a CCD camera, and the specific process is as follows: the CCD camera is used for collecting image signals of the walking belt of the pole piece (2), the length measurement of the CCD camera is realized by accumulating pixel points, and the required length is calculated by shooting and recording the number of the pixel points from the starting point to the end point through the camera.
3. The method for controlling the pole piece extension consistency according to claim 1, characterized in that: in the steps S1 and S2, code spraying is respectively carried out on the left side and the right side of the pole piece (2) at the same time; and step S3, step S4 and step S5, respectively identifying the position information of the left and right code spraying, respectively calculating the extension rates of the left side and the right side of the pole piece (2), and judging the extension consistency of the left side and the right side by comparison.
4. The method for controlling the pole piece extension consistency according to claim 3, characterized in that: and respectively controlling a left linear motor (13) and/or a right linear motor (14) of the front tension roller (5) and the rear tension roller (9) to realize tension adjustment according to the calculated elongation of the left side and the right side of the pole piece (2).
5. The utility model provides a pole piece extension uniformity control system which characterized in that: the system comprises a code spraying device (1), a first camera (4), a second camera (6), a third camera (10) and a PLC (programmable logic controller) (12), wherein the code spraying device, the first camera (4), the second camera (6), the third camera (10) and the PLC (12) are sequentially arranged along the tape moving direction of a pole piece (2), the control ends of the code spraying device (1), the first camera (4), the second camera (6) and the third camera (10) are all connected with the PLC (12), and the PLC (12) is connected with a pole piece rolling tension control system;
a code spraying port of the code spraying device (1) is vertically downward and is opposite to the upper surface of a pole piece (2) ready to enter a front roller (3), and lenses of the first camera (4), the second camera (6) and the third camera (10) are vertically downward and are sequentially positioned between the front roller (3) and the front tension roller (5), between the front tension roller (5) and the upper and lower rollers, and between the rear tension roller (9) and the rear roller (11);
the PLC (12) receives image information collected by the first camera (4), the second camera (6) and the third camera (10) to identify the code spraying position on the upper surface of the pole piece (2) so as to judge the extension state of the pole piece in real time and send a control instruction to the pole piece rolling tension control system according to the extension state of the pole piece;
the pole piece rolling tension control system adjusts the stretching tension according to the control instruction so as to keep the extension consistency state of the pole piece (2).
6. The pole piece extension uniformity control system of claim 5, wherein: and the PLC (12) calculates the elongation of the pole piece (2), adjusts the pole piece rolling tension control system to reduce the stretching tension when the elongation is greater than a preset value, and adjusts the pole piece rolling tension control system to increase the stretching tension when the elongation is less than the preset value.
7. The pole piece extension uniformity control system of claim 5, wherein: the pole piece rolling tension control system comprises an encoder and a linear motor, the encoder records the tape running length of the pole piece (2) and sends the tape running length to the PLC (12), and the linear motor adjusts the gap of the tension roller according to a control command sent by the PLC (12), so that the tension of the tension roller is adjusted.
8. The pole piece extension uniformity control system of claim 7, wherein: the PLC (12) controls the code spraying device (1) to spray codes to the pole piece (2) twice, controls image information collected by the first camera (4), the second camera (6) and the third camera (10) to identify the distance length between the two sprayed codes on the upper surface of the pole piece (2), and sends a control instruction to the linear motor according to the calculated extension rate.
9. The pole piece extension uniformity control system of claim 7, wherein: the linear electric motor is including setting up respectively in left linear electric motor (13), right linear electric motor (14) of preceding tension roller (5) left and right sides, set up respectively in left linear electric motor (13), right linear electric motor (14) of back tension roller (9) left and right sides, left side linear electric motor (13) and right linear electric motor (14) are used for controlling tension roller left side tension size, right side tension size respectively to adjust pole piece (2) left side, right side percentage of extensibility respectively.
10. The system of claim 5, wherein: the first camera (4), the second camera (6) and the third camera (10) are CCD high-speed cameras.
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Address after: No. 1, Chuneng Avenue, Lingkong Economic Zone, Xiaogan City, Hubei Province, 432099 Patentee after: CORNEX NEW ENERGY Co.,Ltd. Address before: 430000 No. 489 Xingguang Avenue, Jiangxia District, Wuhan City, Hubei Province Patentee before: CORNEX NEW ENERGY Co.,Ltd. |