Method for correcting deviation of adhesive tape, adhesive tape applying device, pole piece manufacturing system, and control method thereof

Abstract

The application discloses a kind of adhesive tape deviation correction method, paste glue equipment, pole piece manufacturing system and control method thereof, belong to battery pole piece manufacturing technical field;Adhesive tape deviation correction method includes: S1: obtain the first offset distance of adhesive tape in the width direction of foil;S2: whether first offset distance is less than the maximum deviation correction distance of single time set, if yes, then drive adhesive tape unwinding mechanism to move first offset distance;If no, then drive adhesive tape unwinding mechanism to move maximum deviation correction distance of single time;Wherein, the width of deviation correction area generated after adhesive tape unwinding mechanism moves maximum deviation correction distance of single time is within the permitted range;S3: if adhesive tape unwinding mechanism moves maximum deviation correction distance of single time, then return to execute S1 after preset time t1, wherein t1≥0.The application realizes the deviation correction processing of adhesive tape, and also avoids the problem that the rated length of deviation correction area is too large due to the too large single deviation correction distance, in turn leads to the pole piece area cannot be utilized, causes raw material loss increase.

Description

Technical Field

[0001] This invention belongs to the field of battery electrode manufacturing technology, and specifically relates to a tape correction method, adhesive application equipment, electrode manufacturing system and its control method. Background Technology

[0002] In the coating process of the electrode, a slurry is applied to the surface of the foil through a die to form a coating layer on the surface of the foil. The coating layer is then placed in an oven with the foil for drying and solidification, thereby forming the electrode.

[0003] To improve the forming efficiency of the electrode, the width of the foil is larger than the width of the final formed electrode, usually several times the width of the electrode to be formed. After the drying process of the coating is completed, the electrode assembly is cut to form multiple electrode strips. The cutting position needs to be an empty foil area without coating. This can be used to form tabs on the one hand, and avoids directly cutting the coating and causing damage to the coating on the other hand.

[0004] In the coating and molding process of electrode sheets, the conventional method is to set a pad at the die head outlet to block part of the outlet and prevent material from being discharged from that part, so as to form a spaced empty foil area on the surface of the foil. However, this method requires high surface precision of the pad, otherwise it will lead to unstable discharge effect.

[0005] In addition, adhesive can be applied to the foil before coating. After the foil is coated with slurry, the coating layer on the tape (or adhesive paper) can be peeled off along with the tape, and the area where the tape is attached can form an empty foil area. However, if the tape is continuously released by unwinding and attached to the foil, the tape will have a deviation problem. Summary of the Invention

[0006] The purpose of this invention is to provide a tape correction method, tape application equipment, electrode manufacturing system and control method, which can solve the problem of tape easily becoming misaligned on foil in the prior art, thereby reducing the amount of foil waste.

[0007] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0008] In a first aspect, the present invention provides a method for correcting tape deviation, comprising the following steps:

[0009] S1: Obtain the first offset distance of the tape in the width direction of the foil;

[0010] S2: Determine whether the first offset distance is less than the set single maximum correction distance. If yes, drive the tape unwinding mechanism to move the first offset distance; if no, drive the tape unwinding mechanism to move the single maximum correction distance. Wherein, the width of the correction area generated by the tape unwinding mechanism after moving the single maximum correction distance is within the permissible range.

[0011] S3: If the tape unwinding mechanism moves the maximum single correction distance, it will return to execute S1 after a preset time t1, where t1≥0.

[0012] The tape correction method provided by the present invention has at least the following beneficial effects: the method not only realizes the correction of tape, but also avoids the problem that the correction area within the rated length is too large due to the single correction distance being too large, which would lead to the electrode area being unusable and causing increased raw material loss. At the same time, it can also avoid the problem that the single movement distance of the tape unwinding mechanism is too large and easily deviates from the movement distance driven by the command.

[0013] Secondly, the present invention provides a tape correction method, applied to a tape unwinding mechanism of a tape applicator having multiple tapes spaced apart along their length on a release liner, comprising the following steps:

[0014] S1: Obtain the first offset distance of the tape in the width direction of the foil;

[0015] S2: Determine whether the first offset distance is less than the set single maximum correction distance. If yes, drive the tape unwinding mechanism to move the first offset distance; if no, drive the tape unwinding mechanism to move the single maximum correction distance. Wherein, the width of the correction area generated by the tape unwinding mechanism after moving the single maximum correction distance is within the permissible range.

[0016] S3: If the tape unwinding mechanism moves the maximum single correction distance, it is determined whether the tape being applied has completely detached from the release paper. If so, it returns to execute S1.

[0017] The tape correction method provided by the present invention has at least the following beneficial effects: In the tape application process, multiple tapes arranged at intervals can be used along the length of the foil; compared with the tape correction method provided in the first aspect, when the position of the tape on the foil is corrected and the correction distance reaches the maximum correction distance in a single operation, the method using the above steps can also avoid the entire correction area being located in a single piece of tape, thus preventing increased foil loss.

[0018] As a further improvement to the above technical solution, the step of determining whether the tape being applied has completely detached from the release paper, and if so, returning to execute S1, includes:

[0019] Acquire an image captured by the imaging unit that simultaneously contains the areas of the tape and the empty foil;

[0020] A straight line is fitted through the end of the tape;

[0021] Using the end of the straight line closest to the tape separation mechanism as a reference point, the time t2 for the interval between the two adjacent tapes to reach the tape separation mechanism is obtained based on the length of the tape, the distance between two adjacent tapes, the distance between the tape separation mechanism and the shooting unit, and the moving speed of the foil.

[0022] After acquiring the image, time t2 is elapsed, and execution returns to step S1.

[0023] By implementing the above steps, the exact time when the tape completely detaches from the release paper can be determined, thereby controlling the start time of the correction work and effectively avoiding increased foil material loss caused by the entire correction area being located in a single piece of tape.

[0024] As a further improvement to the above technical solution, the detection position is set downstream of the tape unwinding mechanism along the conveying direction of the foil to obtain the first offset distance. This arrangement allows for clear identification and acquisition of the first offset distance of the tape relative to the foil.

[0025] As a further improvement to the above technical solution, when the foil needs to be cut into sheet-like electrodes of a preset length, the distance between the starting points of two adjacent correction regions is greater than or equal to the preset length. This setting avoids the occurrence of two correction regions in a single electrode sheet, thus ensuring that the width of the correction region in a single electrode sheet remains within the permissible range, does not affect the use of the electrode sheet, and thereby improves the manufacturing yield of the electrode sheet.

[0026] Thirdly, the present invention provides an adhesive applicator that employs any of the above-mentioned tape correction methods.

[0027] The adhesive applicator provided by this invention has at least the following beneficial effects: The adhesive applicator adopts the above-mentioned tape correction method, which can solve the problem that the tape correction span is too large due to the excessive single correction distance, resulting in the electrode sheet in the correction area being unusable. At the same time, it can also solve the problem that when the single correction time is constant, the tape part that is bonded to the foil and bent at an angle is too large due to the excessive single correction distance, which can cause wrinkles. Moreover, it can also solve the problem that the actual correction length does not match the preset correction length due to correction error.

[0028] As a further improvement to the above technical solution, the adhesive application equipment includes a web-correcting drive and a tape unwinding mechanism. The output end of the web-correcting drive is connected to the tape unwinding mechanism to drive the tape unwinding mechanism to move along the width direction of the foil. When correcting the tape's web alignment, the web-correcting drive is used to drive the tape unwinding mechanism to move the tape along the width direction of the foil.

[0029] Fourthly, the present invention provides an electrode manufacturing system, which includes a foil unwinding device, an adhesive application device, a slurry coating device, an adhesive peeling device, and an electrode winding device arranged sequentially along the foil conveying path.

[0030] The electrode manufacturing system provided by this invention has at least the following beneficial effects: during the movement of the foil, the foil can be sequentially subjected to adhesive application, slurry coating, and adhesive peeling, thereby forming a coating layer on the surface of the foil and finally completing the electrode winding process; moreover, in the adhesive application process, since a maximum single correction distance is set, the problem of excessive correction area within the rated length due to a large single correction distance can be avoided, which would lead to the electrode within the correction area being unusable and resulting in losses.

[0031] Fifthly, the present invention provides an electrode manufacturing system, which includes a foil unwinding device, an adhesive application device, a slurry coating device, an adhesive peeling device, a slitting device, and an electrode post-processing device arranged sequentially along the foil conveying path. The electrode post-processing device includes an electrode cutting device or a slitting device and an electrode cutting device arranged sequentially along the foil conveying path. The electrode cutting device is used to cut the foil into sheet-like electrodes of a preset length.

[0032] The electrode manufacturing system provided by this invention has at least the following beneficial effects: During the foil conveying process, adhesive tape is first applied to the foil using an adhesive applicator, followed by a coating layer being applied to the surface of the foil using a slurry coating device. Then, the adhesive tape is peeled off the foil using a peeling device. Subsequently, the continuous foil is processed using an electrode post-processing device to manufacture electrode sheets. Optionally, the continuous foil can be cut into segments of predetermined length using an electrode cutting device. Alternatively, the continuous foil can be first slit using a slitting device to manufacture multiple electrode sheets, and then the electrode sheets can be cut using the electrode cutting device to form electrode sheets of predetermined length. Furthermore, using the aforementioned tape correction method during the adhesive applicator process avoids the problem of excessively large correction areas within the rated length due to large single correction distances, leading to unusable electrode sheets within these correction areas and resulting in losses.

[0033] Sixthly, the present invention provides a control method for an electrode manufacturing system, applicable to any of the electrode manufacturing systems described above, comprising the following steps: when the tape moves to the die head position of the slurry coating equipment, controlling the die head to be laterally adjusted according to the offset distance of the tape, so that the distance between the edge of the coating layer and the tape is constant.

[0034] The control method of the electrode manufacturing system provided by the present invention has at least the following beneficial effects: In the slurry coating process, the die head is adjusted laterally according to the offset distance of the tape to ensure that the distance between the edge of the coating layer and the tape remains constant, so that the coating layer on each electrode obtained by subsequent cutting is more accurate and more uniform in width. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0036] Figure 1 This is a schematic flowchart of the tape correction method provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the tape and coating on the foil.

[0038] Figure 3 This is a schematic diagram of the structure by which the tape corrects its alignment on the foil.

[0039] Figure 4 This is a schematic diagram of the adhesive application device provided in Embodiment 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of the tape unwinding mechanism and the tape correction drive in the tape application equipment provided in Embodiment 1 of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the correction drive component on the moving base in the adhesive application device provided in Embodiment 1 of the present invention;

[0042] Figure 7 This is a schematic diagram of the rack on the fixed seat in the adhesive application device provided in Embodiment 1 of the present invention;

[0043] Figure 8 This is a schematic diagram of the electrode manufacturing system provided in Embodiment 1 of the present invention;

[0044] Figure 9 This is a schematic diagram of the arrangement of the first die head and the second die head in the electrode manufacturing system provided in Embodiment 1 of the present invention; wherein, (a) indicates that the second die head is displaced upstream of the first die head and the discharge direction of the second die head is horizontal; (b) indicates that the first die head is located upstream of the second die head; (c) indicates that the first die head is located downstream of the second die head;

[0045] Figure 10 This is a schematic diagram of the adhesive stripping device in the electrode manufacturing system provided in Embodiment 1 of the present invention;

[0046] Figure 11 This is a schematic flowchart of the tape correction method provided in Embodiment 2 of the present invention;

[0047] Figure 12 This is a schematic diagram of the specific process of step S3′ in the tape correction method provided in Embodiment 2 of the present invention;

[0048] Figure 13 This is a schematic diagram of the specific flow of step S4 in the control method of the electrode manufacturing system provided in Embodiment 1 of the present invention;

[0049] Figure 14 This is a schematic diagram of the specific flow of step S5 in the control method of the electrode manufacturing system provided in Embodiment 1 of the present invention;

[0050] Figure 15 This is a schematic diagram of the specific flow of step S6 in the control method of the electrode manufacturing system provided in Embodiment 1 of the present invention;

[0051] Figure 16 This is a schematic diagram illustrating the working principle of the imaging unit in the tape correction method provided in Embodiment 2 of the present invention.

[0052] The following labels are used in the attached diagram: 110, foil; 120, tape; 130, coating layer; 140, correction zone; 150, tape interval zone; 210, foil unwinding equipment; 220, electrode rewinding equipment; 310, first tension control device; 320, second tension control device; 410, first weighing device; 420, second weighing device;

[0053] 500. Adhesive application equipment; 510. Release paper winding device; 511. First roll; 512. First motor; 520. Release paper unwinding device; 521. Second roll; 530. First buffer device; 531. First slide rail; 532. Counterweight; 540. Adhesive tape peeling mechanism; 551. Drive motor; 552. Gear; 553. Rack; 561. Fixed base; 562. Second slide rail; 563. Moving base;

[0054] 600. Slurry coating equipment; 610. First die head; 620. Second die head; 710. Air flotation device; 720. Drying oven; 800. Glue peeling equipment; 810. Brush; 820. Second buffer device; 830. Waste glue recycling device; 900. Tracking device. Detailed Implementation

[0055] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0056] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0057] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0058] It should be noted that in the attached diagram, the X direction points from the rear to the front of the adhesive applicator; the Y direction points from the left to the right of the adhesive applicator; and the Z direction points from the bottom to the top of the adhesive applicator.

[0059] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0060] Reference Figures 1 to 16 The following are several embodiments of the tape correction method, adhesive application equipment, electrode manufacturing system and control method of the present invention.

[0061] like Figure 1 As shown, Embodiment 1 of the present invention provides a tape correction method, which can be applied to an adhesive applicator 500.

[0062] Understandably, during the adhesive application process, one or more strips of adhesive tape 120 can be applied to the surface of the foil 110, depending on the actual manufacturing situation, to facilitate the subsequent fabrication of the coating layer 130 on the surface of the foil 110, such as... Figure 2 As shown, region A is the coating area. After the tape 120 is peeled off, an empty foil area will be formed at the application location of the tape 120. However, during the application process, the tape 120 will shift in position along the width direction of the foil 110, as shown... Figure 3 As shown, the tape 120 needs to be corrected. In this embodiment, the width direction of the foil 110 is set as the Y direction, and the length direction of the foil 110 is set as the X direction.

[0063] Specifically, the tape correction method includes the following steps:

[0064] Step S1: Obtain the first offset distance of the tape 120 in the width direction of the foil 110.

[0065] Step S2: Determine whether the first offset distance is less than the set single maximum correction distance. If yes, drive the tape unwinding mechanism to move the first offset distance; if no, drive the tape unwinding mechanism to move the single maximum correction distance. The width of the correction area 140 generated by the tape unwinding mechanism after moving the single maximum correction distance is within the permissible range.

[0066] Step S3: If the tape unwinding mechanism moves the maximum correction distance in a single movement, then return to execute S1 after a preset time t1, where t1≥0.

[0067] In step S1, a detection position can be set in the adhesive application process, and the detection unit can be used to obtain the position information of the tape 120 relative to the foil 110 at the detection position, and obtain the distance between the tape 120 and the foil 110 in the width direction. Specifically, a positioning reference can be set on the foil 110, such as taking one of the edges of the foil 110 in the length direction as the positioning reference, and obtaining the distance between one of the edges of the tape 120 in the length direction and the positioning reference.

[0068] Before the adhesive application begins, the position of the tape 120 on the foil 110 is set. At this time, the interval between the tape 120 and the positioning reference is the set spacing. During the adhesive application process, the tape 120 will experience a certain positional shift. Therefore, there is a certain deviation between the real-time spacing of the tape 120 and the positioning reference and the set spacing, which is the first offset distance.

[0069] It is understood that the detection device can be a machine vision system. The detection position of the detection device can be set downstream of the tape unwinding mechanism along the conveying direction of the foil 110, which can clearly identify the position information of the tape 120 and the foil 110 and obtain the corresponding first offset distance.

[0070] After obtaining the first offset distance, it is compared with a preset maximum single correction distance. Then, based on the comparison, the tape unwinding mechanism is adjusted by different offset amounts.

[0071] It is understandable that, such as Figure 3As shown, arrow B indicates the direction of movement of foil 110. After tape 120 moves by a certain offset with the tape unwinding mechanism, a correction zone 140 will be generated. If the single correction distance is too large, it will lead to... Figure 3 The correction area 140 of the inclined portion containing the adhesive tape 120 shown is too large, that is, the span of the adhesive tape 120 before and after correction is too large. This will cause the electrode sheets within the correction area 140 to be unusable and discarded as waste, resulting in raw material loss and increased costs. Alternatively, if the single correction distance is too large when the single correction time is constant, the portion of the adhesive tape 120 that is bonded to the foil 110 and bent at an angle will have an excessively large angle, causing wrinkles. Moreover, an excessively large single correction distance can also easily cause the actual correction length to be inconsistent with the preset correction length due to correction errors.

[0072] Therefore, by setting a second maximum correction distance, this tape correction method avoids the situation where the correction area 140 within the rated length is too large due to a large single correction distance, which would result in the electrode sheets within the correction area 140 being unusable and thus causing losses. At the same time, it also avoids the problem that the single movement distance of the tape unwinding mechanism is too long and easily deviates from the movement distance driven by the command.

[0073] It is understandable that the maximum single correction distance can be derived from experimental data or set according to the adhesive application requirements, and is not specifically limited here; however, it is necessary to ensure that the width of the correction area 140 generated by the tape unwinding mechanism after moving the maximum single correction distance is within the permissible range. Specifically, after the tape 120 is corrected according to the maximum single correction distance, the correction area 140 within the rated length is small, and the span of the tape 120 before and after correction is small. Therefore, the electrode within the correction area 140 is a qualified product and can be used. Moreover, there will be no situation where the angle of the tape 120 that is bonded to the foil 110 and bent at an angle is too large, causing wrinkles.

[0074] If the first offset distance is less than the maximum single correction distance, the tape unwinding mechanism can be driven to move according to the first offset distance to complete the tape 120 correction. At this time, the span of the tape 120 before and after correction is small, and the correction area 140 is small.

[0075] If the first offset distance is equal to or greater than the maximum single correction distance, then the tape unwinding mechanism can be driven to move according to the maximum single correction distance. At this time, the span of the tape 120 before and after correction and the correction area 140 are still within the allowable range, and will not affect the use of the electrode or cause material waste.

[0076] It is understandable that since the width of the correction area 140 generated by the tape unwinding mechanism after moving the maximum correction distance in a single movement is within the permissible range, if the position of the tape unwinding mechanism is still adjusted according to the first offset distance to complete the correction of the tape 120 when the first offset distance is larger than the maximum correction distance in a single movement, then the tape 120 will have a large span before and after correction, and the correction area 140 will be large. This will definitely cause the electrode sheet within the correction area 140 to be unusable, and the tape 120 on the foil 110 will easily become wrinkled.

[0077] It is understandable that time t1 can be preset manually, and no specific limitation is made here. Time t1 is related to the moving speed of foil 110; the greater the moving speed, the smaller time t1.

[0078] In some embodiments, time t1 can be 0, that is, after controlling the tape unwinding mechanism to move the maximum single correction distance, the first offset distance of the tape 120 relative to the foil 110 at this time is immediately detected and obtained, and compared with the maximum single correction distance, so as to control the tape unwinding mechanism to make lateral (that is, the width direction of the foil 110) adjustment according to the corresponding offset amount.

[0079] In other embodiments, time t1 can be 5s, 30s, 1min, etc. After controlling the tape unwinding mechanism to move the maximum single correction distance, timing begins. When time t1 is reached, the first offset distance is obtained and compared with the maximum single correction distance, thereby controlling the tape unwinding mechanism to move along the width direction of the foil 110.

[0080] It is understandable that when the first offset distance is less than the maximum single correction distance, after the tape unwinding mechanism moves laterally by the first offset distance, the tape unwinding mechanism will be corrected again after a certain time T. The time T can be set manually and is greater than the time t1.

[0081] When the first offset distance is too large and exceeds the maximum single correction distance, to prevent the correction area 140 from becoming too large and rendering the electrodes within that area unusable, a second correction is immediately performed on the tape unwinding mechanism after a lateral movement of the maximum single correction distance, at a time interval t1. If a second correction is performed on the tape unwinding mechanism at a time interval T, the first offset distance of the tape 120 will still exceed the maximum single correction distance, leading to a decrease in the correction effect.

[0082] Understandably, there are multiple spaced-apart correction zones 140 along the length of the foil 110, each with a correction starting point. After the coating layer 130 is manufactured, the adhesive is peeled off, and the slitting process is completed, the long electrode sheet is cut to a preset length L to form segments of electrode sheet.

[0083] In some embodiments, when the foil 110 needs to be subsequently cut into sheet-like electrodes of a preset length, the distance S between the starting points of two adjacent correction regions 140 is greater than the preset length. In other embodiments, the distance S between the starting points of two adjacent correction regions 140 is equal to the preset length. It is understood that this arrangement avoids the presence of two correction regions 140 in a single electrode sheet, thereby ensuring that the width of the correction region 140 in a single electrode sheet remains within the permissible range, preventing any impact on the use of the electrode sheet, and thus improving the yield rate of the electrode sheet products.

[0084] In some embodiments, the release paper wound on the tape unwinding mechanism is a continuous tape structure, and the surface of the release paper is covered with continuous tape 120.

[0085] In other embodiments, a plurality of adhesive tapes 120 are applied to the release liner wound on the tape unwinding mechanism, each tape 120 having a fixed nominal length, and all tapes 120 are spaced apart along the length of the release liner. In this case, as Figure 1 and Figure 11 As shown, step S3 is replaced with step S3'. In step S3': if the tape unwinding mechanism moves the maximum correction distance in a single movement, it is determined whether the tape 120 being applied has completely detached from the release paper. If so, the process returns to S1.

[0086] It is understandable that when multiple tapes 120 are used to cover the foil 110, there is a gap between adjacent tapes 120. When the position of the tape 120 on the foil 110 is corrected and the correction distance reaches the maximum single correction distance, it is first determined whether the tape 120 being applied has detached from the release paper. When the tape 120 being applied is completely detached from the release paper, the first offset distance can be obtained, and the tape unwinding mechanism is controlled to make lateral adjustments based on the comparison between the first offset distance and the maximum single correction distance. With this setting, at least a portion of the correction area 140 will fall within the gap between adjacent tapes 120, avoiding the entire correction area 140 being located within a single tape 120, which would increase the loss of the foil 110.

[0087] Specifically, such as Figure 12 As shown, in step S3', it is determined whether the tape 120 being applied has completely detached from the release paper. If so, the process returns to step S1, which includes:

[0088] Step S31: Acquire an image captured by the imaging unit that simultaneously contains the area containing tape 120 and empty foil.

[0089] Step S32: Fit a straight line through the end of tape 120.

[0090] Step S33: Using the end of the straight line closest to the tape separation mechanism as a reference point, based on the length of the tape 120, the distance between two adjacent tapes 120, the distance between the tape separation mechanism and the shooting unit, and the moving speed of the foil 110, obtain the time t2 when the interval area between two adjacent tapes 120 reaches the tape separation mechanism.

[0091] Step S34: After acquiring the image, wait t2 seconds, then return to execute S1.

[0092] The imaging unit can be a camera or a machine vision system. For example... Figure 16 As shown, the foil 110 moves from upstream to downstream, and the shooting unit is positioned downstream of the tape separation mechanism, with a certain distance s between the shooting unit and the tape separation mechanism. Figure 16 In the diagram, P1 is the set position of the tape separation mechanism, and P2 is the set position of the imaging unit. It is understandable that, due to the large size of the tape separation mechanism and the imaging unit, P1 can be defined as the position where the tape 120 separates from the release paper, and the center point of the image captured by the imaging unit can be defined as the reference point. In this case, P2 is the reference point, and therefore, the distance between P1 and P2 is s.

[0093] The imaging unit can acquire an image that simultaneously contains the tape 120 and the empty foil area. It is understood that the tape 120 in the image is completely adhered to the foil 110. After acquiring the image, a straight line is fitted to the end of the tape 120 in the image, and the end of the line closest to the tape separating mechanism is used as a reference point, which is located at P2. It is understood that if the reference point cannot be found at P2, the image is reacquired. After obtaining the reference point, time t2 can be calculated.

[0094] like Figure 16 As shown, assuming the length of tape 120 is b, and the distance between two adjacent tapes 120 is c, it can be understood that there is a tape gap region 150 between two adjacent tapes 120, the length of which is c. The moving speed of foil 110 is v. Therefore, according to the formula t2 = (b + cs) / v, time t2 can be calculated. Thus, after acquiring the image, at a time interval t2, the end of the properly applied tape 120 will move to the tape separation mechanism. At this point, the tape 120 is completely detached from the release paper, and the starting point of the empty foil area is located at the tape separation mechanism. Then, we can return to step S1. Tape 120 correction begins in the empty foil area.

[0095] By implementing the above steps, the exact time when the tape 120 being applied is completely detached from the release paper can be accurately determined, thereby controlling the start time of the correction work and effectively avoiding the increase in foil material 110 caused by the entire correction area 140 being located in a single piece of tape 120.

[0096] In addition, Embodiment 1 of the present invention provides an adhesive applicator 500, which adopts the tape correction method of the above embodiments.

[0097] Among them, such as Figures 5 to 7 As shown, the adhesive application equipment 500 includes a movable base 563, a fixed base 561, a web-aligning drive, and a tape unwinding mechanism. Specifically, the web-aligning drive and the tape unwinding mechanism are both located on the movable base 563. The fixed base 561 is equipped with a second slide rail 562, and the movable base 563 is mounted on the second slide rail 562 via a slider, enabling the movable base 563 to move stably relative to the fixed base 561 in the Y direction. The output end of the web-aligning drive is connected to the tape unwinding mechanism. When the web-aligning drive is working, it can drive the tape unwinding mechanism to move along the width direction of the foil 110.

[0098] In this embodiment, the correction drive is a drive motor 551, preferably a servo motor. The output shaft of the drive motor 551 is equipped with a gear 552, and the fixed base 561 is equipped with a rack 553. The gear 552 and rack 553 mesh with each other. Therefore, when the drive motor 551 is activated, the gear 552 rotates with the output shaft of the drive motor 551, causing the gear 552 to move linearly relative to the rack 553. This allows the movable base 563, together with the tape unwinding mechanism, to move precisely along the width direction of the foil 110, thereby completing the tape 120 correction operation.

[0099] In some embodiments, both the release paper winding device 510 and the release paper unwinding device 520 are mounted on the movable base 563. The release paper winding device 510 includes a first roll 511 and a first motor 512. The first roll 511 is used to wind release paper without adhesive tape 120. The first motor 512 can be a stepper motor, capable of driving the first roll 511 to rotate to complete the release paper winding operation. The release paper unwinding device 520 includes a second roll 521 and a second motor. The second roll 521 is used to unwind release paper containing adhesive tape 120. The second motor can be a stepper motor, capable of driving the second roll 521 to rotate to complete the release paper unwinding operation.

[0100] like Figure 4As shown, in some embodiments, adhesive tape 120 needs to be applied to both opposite surfaces of the foil 110. In this embodiment, the two opposite surfaces of the foil 110 are defined as surface A and surface B, respectively. Therefore, the adhesive application equipment 500 includes two release liner winding devices 510 and two release liner unwinding devices 520. One release liner winding device 510 and one release liner unwinding device 520 constitute the surface A adhesive application mechanism, and the other release liner winding device 510 and the other release liner unwinding device 520 constitute the surface B adhesive application mechanism.

[0101] Adhesive is applied to side A of the foil 110 by an A-side adhesive applicator, and adhesive is applied to side B of the foil 110 by a B-side adhesive applicator. The A-side adhesive applicator can be located downstream of the B-side adhesive applicator. Both the A-side and B-side adhesive applicators are equipped with a first buffer device 530 and a tape peeling mechanism 540 (or tape separation mechanism). The first buffer device 530 is located between the release paper unwinding device 520 and the tape peeling mechanism 540, and is used to tension the release paper. Specifically, as shown... Figure 4 As shown, the first buffer device 530 includes a pulley, a connecting plate, a first slide rail 531, and a counterweight 532. The pulley and the counterweight 532 are respectively arranged on opposite sides of the connecting plate. The connecting plate is mounted on the first slide rail 531 by a slider and can move up and down along the first slide rail 531.

[0102] like Figure 4 As shown, arrow C indicates the direction of movement of the foil 110, arrow D indicates the direction of movement of the release paper containing the adhesive tape 120, and arrow E indicates the direction of movement of the release paper without the adhesive tape 120. The tape peeling mechanism 540 is used to peel the adhesive tape 120 from the release paper. The tape peeling mechanism 540 has a bending section. After the release paper bends and turns along the bending section, the adhesive tape 120 will sequentially leave the release paper and adhere to the surface of the foil 110. The bent and turned release paper will then be wound up by the release paper winding device 510.

[0103] In addition, such as Figure 8 As shown, Embodiment 1 of the present invention provides an electrode manufacturing system. The structure of the electrode manufacturing system includes a foil unwinding device 210, a slurry coating device 600, a peeling device 800, an electrode winding device 220, and an adhesive application device 500 as described in the above embodiment.

[0104] The foil unwinding device 210, adhesive application device 500, slurry coating device 600, adhesive peeling device 800, and electrode rewinding device 220 are sequentially arranged along the conveying path of the foil 110. During the movement of the foil 110, the electrode manufacturing system can sequentially perform adhesive application, slurry coating, and adhesive peeling on the foil 110, thereby forming a coating layer 130 on the surface of the foil 110, and finally completing the electrode rewinding process.

[0105] In some embodiments, such as Figure 8 As shown, the electrode manufacturing system also includes a first tension control device 310, a second tension control device 320, a first weighing device 410, a second weighing device 420, an air flotation device 710, an oven 720, and a deviation correction device 900.

[0106] The foil unwinding device 210, the first tension control device 310, the first weighing device 410 and the adhesive applicator 500 are arranged sequentially along the conveying path of the foil 110. The first tension control device 310 is used to adjust the tension of the foil 110, and the first weighing device 410 is used to measure the weight of the foil 110 before adhesive application.

[0107] The slurry coating equipment 600, the air flotation device 710, the oven 720, the second tension control device 320, and the adhesive stripping device 800 are arranged sequentially along the conveying path of the foil 110. The air flotation device 710 is used to provide air flotation support for the electrode sheet, the oven 720 is used to dry the coating layer 130, and the second tension control device 320 is used to adjust the tension of the foil 110.

[0108] The peeling device 800, the second weighing device 420, the correction device 900, and the electrode winding device 220 are arranged sequentially along the conveying path of the foil 110. The second weighing device 420 is used to measure the weight of the foil 110 after coating and peeling treatment. The correction device 900 is used to correct the deviation of the electrode to facilitate the winding of the electrode by the electrode winding device 220.

[0109] On the other hand, Embodiment 2 of the present invention provides an electrode manufacturing system, which differs from the electrode manufacturing system of Embodiment 1 in that an electrode post-processing device is used to replace the electrode winding device 220.

[0110] In some embodiments, the electrode post-processing equipment includes a slitting device and an electrode cutting device. The slitting device and the electrode cutting device are arranged sequentially along the foil 110 conveying path. The electrode cutting device is used to cut the foil 110 into sheet-like electrodes of a predetermined length.

[0111] So, when the electrode manufacturing system is running, the foil 110 can first be coated with tape 120 by the adhesive applicator 500, then the coating layer 130 is manufactured on the surface of the foil 110 by the slurry coating equipment 600, and then the tape 120 on the foil 110 is peeled off by the adhesive peeling equipment 800, so that an empty foil area is formed on the foil 110. Then, the empty foil area of ​​the foil 110 is cut by the slitting equipment to manufacture multiple electrode sheets. Finally, the long electrode sheets are cut by the electrode cutting equipment to form sections of electrode sheets of the rated length.

[0112] In other embodiments, the electrode post-processing equipment is an electrode cutting equipment.

[0113] Furthermore, Embodiment 1 of the present invention provides a control method for an electrode manufacturing system, applied to the electrode manufacturing system of the above embodiments. The control method includes the following steps:

[0114] Step S4: When the tape 120 moves to the die head position of the slurry coating equipment 600, the control die head is adjusted laterally according to the offset distance of the tape 120 so that the distance between the edge of the coating layer 130 and the tape 120 is constant.

[0115] During the adhesive application process, the tape 120 may shift position on the foil 110, requiring correction. Furthermore, a coating layer 130 needs to be fabricated on the surface of the foil 110. To ensure good manufacturing quality of the electrode, the position of the die head needs to be adjusted according to the position of the tape 120 on the foil 110.

[0116] In the slurry coating process, the slurry flows out from the die head and forms a coating layer 130 on the surface of the foil 110. When manufacturing the coating layer 130, the die head can be adjusted laterally according to the offset distance of the tape 120 to ensure that the distance between the edge of the coating layer 130 and the edge of the tape 120 remains constant, so that the width of the coating layer 130 is more consistent in each electrode sheet obtained in the subsequent slitting process.

[0117] like Figure 13 As shown, step S4 specifically includes the following steps:

[0118] Step S41: Obtain the position information of the tape 120 collected by the detection unit.

[0119] Step S42: Based on the moving speed of the foil 110 and the distance between the die head and the detection unit, obtain the time t3 when the tape 120 reaches the die head.

[0120] Step S43: After obtaining the position information of tape 120, after a time interval of t3, control the die head to adjust laterally according to the offset distance of tape 120.

[0121] A detection unit can be positioned upstream of the die head to detect the actual position of the tape 120. For example, the detection unit can be a vision inspection system. Since the distance between the detection unit and the die head in the moving direction of the foil 110 is constant, and the moving speed of the foil 110 is known, when the detection unit detects that the tape 120 has moved with the foil 110 to the detection position, the time t3 taken for the tape 120 to move from the detection position to the die head position can be calculated. After the detection unit generates a detection signal, after a time interval t3, it controls the die head to adjust laterally according to the offset of the tape 120, ensuring that the distance between the edge of the coating layer 130 and the tape 120 remains constant.

[0122] like Figure 9 As shown, when both sides A and B of the foil 110 require a coating layer 130, adhesive tape 120 is applied to both sides of the foil 110. Therefore, during the slurry coating process, a first die 610 and a second die 620 are used to coat sides A and B of the foil 110 respectively. Figure 9 In (a), the second die head 620 is located upstream of the first die head 610. The second die head 620 first coats the B side of the foil 110, and then the first die head 610 coats the A side of the foil 110. At this time, the discharge direction of the second die head 620 is horizontal. Figure 9 In (b), the first die head 610 is located upstream of the second die head 620, with the discharge direction of the first die head 610 facing downwards and the discharge direction of the second die head 620 facing upwards. Figure 9 In (c), the second mold head 620 is located upstream of the first mold head 610, and the discharge direction of the first mold head 610 is downward, while the discharge direction of the second mold head 620 is upward.

[0123] Among them, such as Figure 14 As shown, in step S43, the step of controlling the die head to adjust laterally according to the offset distance of the tape 120 includes the following steps:

[0124] Step S51: Pre-fit the position information of the coating layer 130 on the foil 110 after the die head is adjusted.

[0125] Step S52: Determine whether the position information of the coating layer 130 is within the allowable range. If yes, control the die head to adjust laterally according to the offset distance of the tape 120; if no, control the die head to adjust laterally according to the set maximum offset distance.

[0126] Before formally adjusting the lateral offset of the die head, the position of the lower coating layer 130 after the die head adjustment can be predicted. Specifically, through pre-fitting processing, it can be determined whether the position of the coating layer 130 is appropriate after the lateral adjustment of the die head position.

[0127] If done properly, the die head is adjusted laterally according to the offset distance of the tape 120. After the die head position is adjusted, the distance between the edge of the coating layer 130 and the tape 120 can be kept constant, and the cut electrode sheet can be used.

[0128] If not done properly, it will affect the formation of the subsequent coating layer 130. Therefore, the die head needs to be adjusted laterally according to the set maximum offset distance so that the position of the subsequently manufactured coating layer 130 on the foil 110 is within the allowable range, thereby reducing the loss of raw materials. It is understood that the maximum offset distance is set manually in advance, and the specific value is not limited here.

[0129] In some embodiments, the control method for the electrode manufacturing system further includes the following steps:

[0130] Step S6: When the tape 120 moves to the peeling position, the peeling and winding mechanism of the peeling device 800 is adjusted laterally according to the offset distance of the tape 120.

[0131] Understandably, since the tape 120 undergoes a correction process when it is applied to the foil 110, the tape 120 can be peeled off the foil 110 by adjusting the tape offset. Specifically, the tape peeling and winding mechanism is driven to move along the width of the foil 110. At this time, the position of the tape peeling and winding mechanism is adjusted according to the offset distance of the tape 120 to be peeled, so that the tape peeling and winding mechanism can peel off all the tape 120 on the foil 110 with good peeling effect. This effectively avoids some tape 120 remaining on the foil 110, which would require rework, thereby improving work efficiency.

[0132] It is understandable that, such as Figure 10 As shown, since both sides A and B of the foil 110 are covered with adhesive tape 120, two peeling and winding mechanisms are required to peel the adhesive from sides A and B of the foil 110 respectively. After the adhesive tape 120 is peeled off from the surface of the foil 110, an empty foil area will be formed on the surface of the foil 110, which is convenient for the slitting equipment to slit the empty foil area to manufacture long electrode sheets.

[0133] The adhesive stripping and winding mechanism includes an adhesive stripping roller assembly, a brush 810, a second buffer device 820, and a waste adhesive recycling device 830. The adhesive stripping roller assembly is used to peel the adhesive tape 120 from the foil 110. The brush 810 is used to clean dust from the surface of the electrode sheet after peeling, ensuring a clean surface. The second buffer device 820 is used to control the tension of the peeled adhesive tape 120, and its structure is identical to the first buffer device 830. The waste adhesive recycling device 830 is used to recycle the peeled adhesive tape 120.

[0134] like Figure 15 As shown, step S6 specifically includes the following steps:

[0135] Step S61: Based on the moving speed of the foil 110 and the distance between the adhesive application position and the adhesive peeling position, obtain the time t4 when the tape 120 reaches the adhesive peeling position.

[0136] Step S62: After the tape 120 has finished applying the adhesive, at interval t4, control the peeling and winding mechanism to make lateral adjustments according to the offset distance of the tape 120.

[0137] It is understandable that the adhesive application position is located upstream of the adhesive peeling position. Looking along the moving direction of the foil 110, the distance between the adhesive application position and the adhesive peeling position is constant, and the moving speed of the foil 110 is known. Therefore, the time t4 taken for the tape 120 to move from the adhesive application position to the adhesive peeling position can be accurately calculated. A detection unit can be used to detect whether the tape 120 is at the adhesive application position; this detection unit can be a vision inspection system.

[0138] Furthermore, the offset of the tape 120 can be obtained during the tape application process. Therefore, if the time t4 taken for the tape 120 to reach the peeling position is obtained, after t4 is detected that the tape 120 has reached the application position, the peeling position of the peeling and winding mechanism can be accurately controlled according to the offset of the tape 120, thereby completely peeling the tape 120 off the foil 110.

[0139] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A tape correction method, applied to a tape unwinding mechanism of a tape applicator where a release liner is covered with multiple tapes spaced apart along their length, characterized in that, Includes the following steps: S1: Obtain the first offset distance of the tape in the width direction of the foil; wherein multiple tapes are arranged at intervals along the length direction of the foil, and after the tapes are applied to the surface of the foil, the surface of the foil is coated, and after the tapes are peeled off, the application position of the tapes forms an empty foil area; S2: Determine whether the first offset distance is less than the set single maximum correction distance. If yes, drive the tape unwinding mechanism to move the first offset distance; if no, drive the tape unwinding mechanism to move the single maximum correction distance. Wherein, the width of the correction area generated by the tape unwinding mechanism after moving the single maximum correction distance is within the permissible range. S3: If the tape unwinding mechanism moves the maximum single correction distance, it is determined whether the tape being applied has completely detached from the release paper. If so, it returns to execute S1. The step of determining whether the tape being applied has completely detached from the release paper, and if so, returning to execute S1, includes: Acquire an image captured by the imaging unit that simultaneously contains the areas of the tape and the empty foil; A straight line is fitted through the end of the tape; Using the end of the straight line closest to the tape separation mechanism as a reference point, the time t2 for the interval between the two adjacent tapes to reach the tape separation mechanism is obtained based on the length of the tape, the distance between two adjacent tapes, the distance between the tape separation mechanism and the shooting unit, and the moving speed of the foil. After acquiring the image, time t2 is elapsed, and execution returns to step S1.

2. The tape correction method according to claim 1, characterized in that, Along the conveying direction of the foil, the detection position is set downstream of the tape unwinding mechanism to obtain the first offset distance.

3. The tape correction method according to claim 1, characterized in that, When the foil needs to be cut into sheet-like electrodes of a preset length, the distance between the starting points of two adjacent correction regions is greater than or equal to the preset length.

4. An adhesive application device, characterized in that, The tape correction method as described in any one of claims 1 to 3 is adopted.

5. The adhesive applicator according to claim 4, characterized in that, It includes a web-correcting drive and a tape unwinding mechanism. The output end of the web-correcting drive is connected to the tape unwinding mechanism to drive the tape unwinding mechanism to move along the width direction of the foil.

6. An electrode manufacturing system, characterized in that, It includes a foil unwinding device arranged sequentially along the foil conveying path, an adhesive application device as described in claim 4 or 5, a slurry coating device, an adhesive peeling device, and an electrode winding device.

7. An electrode manufacturing system, characterized in that, The device includes a foil unwinding device arranged sequentially along the foil conveying path, an adhesive application device as described in claim 4 or 5, a slurry coating device, an adhesive peeling device, and an electrode post-processing device. The electrode post-processing device includes an electrode cutting device or a slitting device and an electrode cutting device arranged sequentially along the foil conveying path. The electrode cutting device is used to cut the foil into sheet-like electrodes of a preset length.

8. A control method for an electrode manufacturing system, applied to the electrode manufacturing system as described in claim 6 or 7, characterized in that, The process includes the following steps: when the tape moves to the die head position of the slurry coating equipment, the die head is controlled to be laterally adjusted according to the offset distance of the tape, so that the distance between the edge of the coating layer and the tape is constant.

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