Pole piece manufacturing equipment

Abstract

The utility model discloses pole piece manufacturing equipment which comprises a conveying device used for driving a pole piece to move along a conveying path; the rolling device is arranged on the conveying path and is used for rolling the film coating area; the first stretching roller is arranged at the upstream of the rolling device and is used for stretching the tab area; the second stretching roller is arranged at the downstream of the rolling device and is used for stretching the tab area; and the heating device is arranged outside the first stretching roller and is opposite to the first convex structure, and / or the heating device is arranged outside the second stretching roller and is opposite to the second convex structure. According to the technical scheme provided by the invention, the technical problem that the tape breakage risk exists if the tab area is forcibly stretched or the stretching force applied to the tab area is too large can be solved.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and particularly to a pole piece manufacturing device. Background Art

[0002] With the development of lithium batteries, the requirements for battery energy are getting higher and higher. To achieve a higher energy density, the rolled pole piece needs to be more densely compressed. Generally, tab areas and coated film areas are alternately arranged on the pole piece. During the rolling process of the pole piece, the elongation rate of the tab area is smaller than that of the coated film area. Therefore, wrinkles may appear in the tab area or wavy edges may appear in the coated film area after rolling. Thus, a stretching mechanism is needed to stretch the tab area so that the elongation rates of the tab area and the coated film area are the same to reduce wrinkles in the tab area and wavy edges in the coated film area. However, since the tab area is generally thinner, there is a risk of tape breakage if the tab area is forcibly stretched or the stretching force applied to the tab area is too large. Summary of the Utility Model

[0003] This application provides a pole piece manufacturing device to solve the technical problem that there is a risk of tape breakage if the tab area is forcibly stretched or the stretching force applied to the tab area is too large.

[0004] A pole piece manufacturing device, the pole piece has a tab area and a coated film area, the pole piece manufacturing device has a conveying path, and the pole piece manufacturing device includes:

[0005] A conveying device for driving the pole piece to move along the conveying path;

[0006] A rolling device arranged on the conveying path for rolling the coated film area;

[0007] A first stretching roller, along the conveying path, the first stretching roller is arranged upstream of the rolling device, and a first convex structure is arranged on the outer periphery of the first stretching roller for stretching the tab area;

[0008] A second stretching roller is arranged downstream of the rolling device, and a second convex structure is arranged on the outer periphery of the second stretching roller for stretching the tab area;

[0009] A heating device, along the conveying path, the second stretching roller is arranged outside the first stretching roller and is arranged opposite to the first convex structure, and / or is arranged outside the second stretching roller and is arranged opposite to the second convex structure.

[0010] Optionally, the heating device includes a first heater and a second heater, the first heater is arranged opposite to the first convex structure, and the second heater is arranged opposite to the second convex structure.

[0011] Optionally, along the axis direction of the first stretching roller, the first stretching roller includes alternately distributed first roller sections and second roller sections, the first roller sections and the second roller sections are connected, and the first convex structure protrudes from the outer periphery of the second roller section;

[0012] The pole piece manufacturing equipment further includes a first marker and a second marker;

[0013] Along the conveying path, the first marker is arranged upstream of the first roller section and is used for setting a coating area marker in the coating area;

[0014] The second marker is arranged upstream of the second roller section and is used for setting an ear area marker in the ear area.

[0015] Optionally, the first marker and / or the second marker is a laser.

[0016] Optionally, along the axis direction of the second stretching roller, the second stretching roller includes alternately distributed third roller sections and fourth roller sections, the third roller sections and the fourth roller sections are connected, and the second convex structure protrudes from the outer periphery of the fourth roller section;

[0017] The pole piece manufacturing equipment further includes a first detector and a second detector;

[0018] The first detector is arranged downstream of the third roller section and is used for detecting the coating area marker;

[0019] The second detector is arranged downstream of the fourth roller section and is used for detecting the ear area marker.

[0020] Optionally, the first detector and / or the second detector is a scanner.

[0021] Optionally, the pole piece manufacturing equipment further includes a first guide roller and a second guide roller, and the first guide roller and the second guide roller are respectively arranged on opposite sides of the conveying path; along the conveying path, the first guide roller is arranged upstream of the first stretching roller, the second guide roller is arranged upstream of the first guide roller, and the first marker and the second marker are located between the first guide roller and the second guide roller.

[0022] Optionally, the pole piece manufacturing equipment further includes a third guide roller and a fourth guide roller, and the third guide roller and the fourth guide roller are respectively arranged on opposite sides of the conveying path;

[0023] Along the conveying path, the third guide roller is arranged downstream of the second stretching roller, the fourth guide roller is arranged downstream of the third guide roller, and the first detector and the second detector are located between the third guide roller and the fourth guide roller.

[0024] Optionally, the pole piece manufacturing equipment has an adjustment direction perpendicular to the conveying path,

[0025] The pole piece manufacturing equipment further includes an adjusting device, and the adjusting device is used for driving the first stretching roller and / or the second stretching roller to move in the adjustment direction to adjust the magnitude of the stretching tension applied to the pole piece.

[0026] Optionally, the pole piece manufacturing equipment further includes a first guide roller and a first tension isolating roller,

[0027] The first over-roller and the first tension isolation roller are respectively arranged on opposite sides of the conveying path, and the first stretching roller and the first tension isolation roller are arranged on the same side of the conveying path;

[0028] Both the first over-roller and the first tension isolation roller are arranged upstream of the first stretching roller;

[0029] The pole piece manufacturing equipment further includes a third over-roller and a second tension isolation roller. The second stretching roller and the third over-roller are respectively arranged on opposite sides of the conveying path, and the second stretching roller and the second tension isolation roller are arranged on the same side of the conveying path;

[0030] Both the third over-roller and the second tension isolation roller are arranged downstream of the second stretching roller.

[0031] The pole piece manufacturing equipment of the present application has at least the following beneficial effects:

[0032] In the pole piece manufacturing equipment of the present application, by respectively arranging stretching rollers upstream and downstream of the rolling device, the stretching roller located upstream of the rolling device can pre-stretch the tab area of the pole piece, so that when the stretching roller located downstream of the rolling device stretches the tab area of the pole piece, it does not need to apply too large a stretching tension to the pole piece, which can reduce the risk of tape breakage, and at the same time can also relieve the diagonal pattern that appears after the pole piece is stretched; by arranging a heating device at the convex structure of the stretching roller, the tab area of the pole piece can be heated, making the tab area easier to stretch, so that the magnitude of the stretching tension applied by the stretching roller to the tab area can be further reduced. Description of the Drawings

[0033] The following will combine the drawings and describe the specific embodiments of the present application in detail, and the technical solutions and other beneficial effects of the present application will be obvious.

[0034] Figure 1 It is a top-view structural schematic diagram of the pole piece provided by the embodiment of the present application;

[0035] Figure 2 It is a structural schematic diagram of the pole piece manufacturing equipment provided by the embodiment of the present application;

[0036] Figure 3 It is a conveying schematic diagram of the pole piece in the pole piece manufacturing equipment provided by the embodiment of the present application;

[0037] Figure 4 It is a position state schematic diagram between the marker, the detector and each roller in the top view direction provided by the embodiment of the present application;

[0038] Figure 5 It is a position state schematic diagram between the marker and the pole piece in the top view direction provided by the embodiment of the present application;

[0039] Figure 6It is a schematic diagram of the positional state between the detector and the pole piece in the top-down direction provided by an embodiment of the present application;

[0040] Figure 7 It is a schematic semi-sectional structure diagram of the first stretching roller provided by an embodiment of the present application;

[0041] Figure 8 It is a schematic semi-sectional structure diagram of the second stretching roller provided by an embodiment of the present application;

[0042] Figure 9 It is a schematic diagram of the positional state between the heater and the stretching roller provided by an embodiment of the present application.

[0043] Reference numerals: 10 - pole piece, 11 - tab area, 111 - tab area mark, 1111 - first tab area mark, 1112 - second tab area mark, 12 - coating area, 121 - coating area mark, 1211 - first coating area mark, 1212 - second coating area mark, 20 - conveying device, 21 - unwind roller, 22 - wind-up roller, 30 - rolling device, 31 - first roll, 32 - second roll, 40 - first stretching roller, 41 - first convex structure, 42 - first roller section, 43 - second roller section, 50 - second stretching roller, 51 - second convex structure, 52 - third roller section, 53 - fourth roller section, 60 - heating device, 61 - first heater, 62 - second heater, 63 - heating wheel, 64 - transmission rod, 70 - first marker, 80 - second marker, 90 - first detector, 100 - second detector, 110 - first idler roller, 120 - second idler roller, 130 - third idler roller, 140 - fourth idler roller, 150 - adjusting device, 160 - first tension isolating roller, 170 - fifth idler roller, 180 - second tension isolating roller, 190 - sixth idler roller, 200 - seventh idler roller, 210 - eighth idler roller, 220 - ninth idler roller, 230 - tenth idler roller, 240 - processing device, X - conveying path, Z - adjusting direction, Y - bandwidth direction. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the term "and / or" in this article is only a relational term describing the associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after without special explanation. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0046] As Figure 1 shown, in the manufacture of lithium-ion batteries, an active material layer is coated on the surface of the current collector. After drying, an active layer is formed on the surface of the current collector. The area of the current collector coated with the active material layer is called the coating film area 12, and the area not coated with the active material layer is called the tab area 11. Finally, after die-cutting, the electrode sheet 10 that can be used for winding or stacking can be obtained. That is, before die-cutting, the electrode sheet 10 generally has the tab area 11 and the coating film area 12 arranged alternately along the width direction Y of the current collector. After die-cutting, each electrode sheet 10 includes the tab area 11 and the coating film area 12. Since the thickness of the coating film area 12 is greater than that of the tab area 11, during the rolling process of the electrode sheet 10, the elongation rate of the tab area 11 is smaller than that of the coating film area 12. Therefore, problems such as wrinkles in the tab area 11 or wavy edges in the coating film area 12 will occur in the rolled electrode sheet 10. In order to reduce the elongation rate difference between the tab area 11 and the coating film area 12, improve the tab appearance, and reduce the risk of tape breakage, an electrode sheet manufacturing apparatus is provided in an embodiment of the present application.

[0047] The electrode sheet manufacturing apparatus includes a conveying device 20, a rolling device 30, a first stretching roller 40, a second stretching roller 50, and a heating device 60. The conveying device 20 is used to drive the electrode sheet 10 to move along the conveying path X. The rolling device 30 is arranged on opposite sides of the conveying path X and is used to roll the coating film area 12. Along the conveying path X, the first stretching roller 40 is arranged upstream of the rolling device 30, and a first convex structure 41 is arranged on the outer periphery of the first stretching roller 40 for stretching the tab area 11. Along the conveying path X, the second stretching roller 50 is arranged downstream of the rolling device 30, and a second convex structure 51 is arranged on the outer periphery of the second stretching roller 50 for stretching the tab area 11. The heating device 60 is arranged outside the first stretching roller 40 and is arranged opposite to the first convex structure 41, and / or is arranged outside the second stretching roller 50 and is arranged opposite to the second convex structure 51 for heating the tab area 11.

[0048] The pole piece manufacturing equipment of the present application is provided with stretching rollers upstream and downstream of the rolling device 30 respectively. The first stretching roller 40 located upstream of the rolling device 30 can pre-stretch the tab area 11 of the pole piece 10, so that when the second stretching roller 50 located downstream of the rolling device 30 stretches the tab area 11 of the pole piece 10, it is not necessary to apply too large a stretching tension to the pole piece 10, thereby reducing the risk of tape breakage. At the same time, it can also relieve the twill pattern that appears after the pole piece 10 is stretched. By providing a heating device 60 at the convex structure of the stretching roller, the tab area 11 of the pole piece 10 can be heated, making the tab area 11 easier to stretch, and further reducing the magnitude of the stretching tension applied by the stretching roller to the tab area 11. The following will be elaborated in detail.

[0049] Please refer to Figure 2 and Figure 3 , in an embodiment, the conveying device 20 may be composed of an unwinding roller 21 and a winding roller 22. The unwinding roller 21 is arranged at the uppermost upstream of the conveying path X and is used to carry and release the pole piece 10 before rolling and stretching. The winding roller 22 is arranged at the lowermost downstream of the conveying path X and is used to wind the pole piece 10 after rolling and stretching. The unwinding roller 21 and the winding roller 22 work together, one unwinding and the other winding, so as to drive the pole piece 10 to move along the conveying path X. The rolling device 30 includes a first rolling roller 31 and a second rolling roller 32 distributed on opposite sides of the conveying path X. The axial directions of the first rolling roller 31 and the second rolling roller 32 are horizontally arranged respectively. Both ends of the axial direction of the first rolling roller 31 and both ends of the axial direction of the second rolling roller 32 can be rotatably connected to the frame of the pole piece manufacturing equipment (not shown in the figure). The conveying path X passes between the first rolling roller 31 and the second rolling roller 32. That is, in a specific implementation, the pole piece 10 passes between the first rolling roller 31 and the second rolling roller 32, and the first rolling roller 31 and the second rolling roller 32 cooperate to roll and extend the pole piece 10. Since the thickness of the coating area 12 of the pole piece 10 is greater than the thickness of the tab area 11, therefore, in this process, the first rolling roller 31 and the second rolling roller 32 mainly roll and extend the coating area 12. Since the rolling device 30 is a conventional technology, the specific structure and working principle of the rolling device 30 will not be elaborated in detail in the present application. In addition, it should be noted that since the setting methods of the first rolling roller 31 and the second rolling roller 32 can be realized by existing technologies, they will not be elaborated in detail in the embodiments of the present application.

[0050] Along the axial direction of the first stretching roller 40, the first stretching roller 40 includes alternately distributed first roller segments 42 and second roller segments 43. The first roller segments 42 and the second roller segments 43 are connected, and the first convex structure 41 protrudes from the outer periphery of the second roller segment 43, as Figure 4 and Figure 7As shown. The axial direction of the first stretching roller 40 is the same as the axial direction of the first rolling roller 31 or the second rolling roller 32. Both ends in the axial direction of the first stretching roller 40 can be rotatably connected to the frame. In one embodiment, the conveying path X bypasses from above the first stretching roller 40 and then passes between the first rolling roller 31 and the second rolling roller 32. That is, in specific implementation, the pole piece 10 bypasses from above the first stretching roller 40 and then passes through between the first rolling roller 31 and the second rolling roller 32. The tab area 11 of the pole piece 10 is arranged in one-to-one correspondence with the first convex structure 41 of the first stretching roller 40. During the process that the pole piece 10 bypasses from above the first stretching roller 40, the first stretching roller 40 applies a stretching tension to the pole piece 10, and the first convex structure 41 performs the first stretching on the tab area 11.

[0051] Along the axial direction of the second stretching roller 50, the second stretching roller 50 includes alternately distributed third roller sections 52 and fourth roller sections 53. The third roller sections 52 and the fourth roller sections 53 are connected, and the second convex structure 51 protrudes from the outer periphery of the fourth roller section 53, as Figure 4 and Figure 8 shown. The axial direction of the second stretching roller 50 is the same as the axial direction of the first rolling roller 31 or the second rolling roller 32. Both ends in the axial direction of the second stretching roller 50 can be rotatably connected to the frame. In one embodiment, the conveying path X passes between the first rolling roller 31 and the second rolling roller 32 and then bypasses from above the second stretching roller 50. That is, in specific implementation, the pole piece 10 passes between the first rolling roller 31 and the second rolling roller 32 and then bypasses from above the first stretching roller 40. The tab area 11 of the pole piece 10 is arranged in one-to-one correspondence with the second convex structure 51 of the second stretching roller 50. During the process that the pole piece 10 bypasses from above the second stretching roller 50, the second stretching roller 50 applies a stretching tension to the pole piece 10, and the second convex structure 51 performs the second stretching on the tab area 11.

[0052] Since the stretching roller is a conventional technology, the working principles of the first stretching roller 40 and the second stretching roller 50 will not be described in detail in this application. The pole piece manufacturing equipment of this application sets the first stretching roller 40 upstream of the rolling device 30 and sets the second stretching roller 50 downstream of the rolling device 30. The first stretching roller 40 mainly plays the role of pre-stretching the tab area 11, so that the tab area 11 is stretched once before the rolling device 30 rolls and extends the coating area 12, thereby reducing the difference in the amount of deformation between the tab area 11 and the coating area 12 of the pole piece 10 after being rolled and extended by the rolling device 30. Such a design can enable the second stretching roller 50 not to apply too large a stretching tension when performing the second stretching on the tab area 11 of the pole piece 10. On the one hand, it can reduce the risk of tape breakage, and on the other hand, it can also relieve the diagonal lines that appear in the tab area 11 due to too large a stretching tension.

[0053] In one embodiment, the heating device 60 may include a first heater 61 and a second heater 62. The first heater 61 is disposed opposite to the first convex structure 41, and the second heater 62 is disposed opposite to the second convex structure 51. The first heater 61 or the second heater 62 may be in various forms. For example, it may be a plurality of heating wheels 63 schematically shown in Figure 9 . It should be noted that Figure 9 illustrates by taking the first heater 61 and the first stretching roller 40 as examples. The same design may also be adopted between the second heater 62 and the second stretching roller 50. Therefore, no additional drawings will be provided to illustrate the second heater 62 and the second stretching roller 50. The plurality of heating wheels 63 are arranged at intervals along the axis direction of the first stretching roller 40, and the heating wheels 63 correspond to the first convex structures 41 one by one. The plurality of heating wheels 63 may be connected by a transmission rod 64. The two ends of the transmission rod 64 are rotatably connected to the bracket. The heating wheel 63 may be heated by means of an internal heating wire, etc. The heating wire may be electrically connected to an external power source through a slip ring and a cable. Since the use of slip ring technology to achieve electrical conduction is a conventional technology, it will not be described in detail in this application.

[0054] In specific implementation, the electrode sheet 10 passes through between the first heater 61 and the first stretching roller 40. The heating wheel 63 will heat the tab area 11 of the electrode sheet 10, so that the first stretching roller 40 can more easily stretch the tab area 11 of the electrode sheet 10 without applying too much stretching force, thereby reducing the risk of tape breakage. Of course, the above only shows one embodiment. In specific implementation, the first heater 61 and the second heater 62 are not limited to the above one. For example, they may also be electromagnetic heaters, infrared heaters, etc. Since there are various forms of their setting methods and they can all be implemented by existing technologies. For example, an infrared heater may be disposed on a bracket and then fixedly connected to the frame through the bracket, etc. Therefore, it will not be described in detail in this application.

[0055] In one embodiment, the electrode sheet manufacturing equipment further includes a first marker 70 and a second marker 80. Along the conveying path X, the first marker 70 is disposed upstream of the first roller section 42, and the working direction is towards the coating area 12 of the electrode sheet 10, and a coating area mark 121 may be set in the coating area 12; the second marker 80 is disposed upstream of the second roller section 43, and the working direction is towards the tab area 11 of the electrode sheet 10, and a tab area mark 111 may be set in the tab area 11, such as Figure 3As shown. Designed in this way, in specific implementation, the first marker 70 and the second marker 80 can be used to set marks on the coating area 12 and the tab area 11 of the electrode sheet 10 respectively, so as to judge the elongation rate difference between the tab area 11 and the coating area 12 of the electrode sheet 10 after the stretching and rolling extension effects of the first stretching roller 40, the rolling device 30 and the second stretching roller 50. Specifically, for example, the first marker 70 can be controlled to mark the first coating area mark 1211 in the coating area 12, and the second marker 80 can be controlled to mark the first tab area mark 1111 in the tab area 11; after setting an interval time, the first marker 70 is controlled to mark the second coating area mark 1212 in the coating area 12, and the second marker 80 is controlled to mark the second tab area mark 1112 in the tab area 11, as Figure 5 shown; measure the distance L1 between the first tab area mark 1111 and the second tab area mark 1112 and the distance L2 between the first coating area mark 1211 and the second coating area mark 1212 before stretching by the first stretching roller 40, as Figure 5 shown; and measure the distance L3 between the first tab area mark 1111 and the second tab area mark 1112 and the distance L4 between the first coating area mark 1211 and the second coating area mark 1212 after stretching by the second stretching roller 50, as Figure 6 shown. The elongation rate of the tab area 11 is calculated by the formula (L3 - L1) / L1; the elongation rate of the coating area 12 is calculated by the formula (L4 - L2) / L2, and then the elongation rate difference between the coating area 12 and the tab area 11 can be calculated. The first marker 70 and the second marker 80 can adopt lasers with adjustable power, and can be fixedly connected to the frame through brackets or other means for laser dot marking on the coating area 12 or the tab area 11. The depth of the mark can be controlled within 0.5 μm, which will not cause damage to the tab area 11 and the coating area 12 and cause problems such as low cell capacity.

[0056] In one embodiment, the first stretching roller 40 and the second stretching roller 50 can be designed as adjustable structures, so that the stretching tension applied by the first stretching roller 40 or the second stretching roller 50 to the electrode sheet 10 can be flexibly adjusted according to the elongation rate difference between the coating area 12 and the tab area 11, and then the elongation rate of the tab area 11 can be adjusted to reduce the elongation rate difference between the coating area 12 and the tab area 11. In Figure 2 or Figure 3 the embodiment shown in, the vertical direction is also the adjustment direction Z of the first stretching roller 40 and the second stretching roller 50. Of course, the adjustment direction Z of the first stretching roller 40 and the second stretching roller 50 is not limited to the vertical direction. In other embodiments, the adjustment direction Z can also be set as required, but the adjustment direction Z should be perpendicular to the conveying path X to realize that when the first stretching roller 40 or the second stretching roller 50 is moved along the adjustment direction Z, its stretching tension on the electrode sheet 10 can be adjusted.

[0057] When the elongation difference between the coating film area 12 and the tab area 11 is greater than a certain set value, such as 0.2%, it indicates that the stretching of the tab area 11 is insufficient. By adjusting the first stretching roller 40 and / or the second stretching roller 50 to move upward, the stretching tension on the electrode sheet 10 can be increased, thereby improving the elongation degree of the tab area 11. For another example, when the elongation difference between the coating film area 12 and the tab area 11 is less than a certain set value, such as 0.2%, it indicates that the stretching of the tab area 11 is excessive. By adjusting the first stretching roller 40 and / or the second stretching roller 50 to move downward, the stretching tension on the electrode sheet 10 can be reduced, thereby reducing the elongation degree of the tab area 11.

[0058] In one embodiment, both ends of the first stretching roller 40 can be respectively connected to the frame through an adjusting driving device (not shown in the figure). The adjusting driving device can be a linear driving mechanism such as a cylinder or an electric cylinder. Taking the electric cylinder as an example, an electric cylinder is arranged at each end of the first stretching roller 40. The body of the electric cylinder can be fixedly connected to the frame, and the shaft end of the first stretching roller 40 is rotatably connected to the telescopic shaft of the electric cylinder. By controlling the two electric cylinders to make their telescopic shafts move vertically, the first stretching roller 40 can be controlled to move upward or downward. Since there are various forms of the adjustable position of the roller shaft and it can also be realized by the prior art, the adjusting driving device for driving the displacement of the first stretching roller 40 will not be described in detail in this application. The adjustable design of the second stretching roller 50 is the same and will not be elaborated here.

[0059] In one embodiment, the distances L1 between the first tab area marker 1111 and the second tab area marker 1112, the distance L2 between the first coating film area marker 1211 and the second coating film area marker 1212, the distance L3 between the first tab area marker 1111 and the second tab area marker 1112, and the distance L4 between the first coating film area marker 1211 and the second coating film area marker 1212 can all be measured manually.

[0060] In another embodiment, for the above-mentioned distances, the electrode sheet manufacturing equipment can also adopt an automatic measurement method. For example, a processing device 240 can be set, and the processing device 240 is respectively communicatively connected to the first marker 70 and the second marker 80. The processing device 240 can be a processor with a built-in algorithm, and can calculate the distance L1 between the first tab area marker 1111 and the second tab area marker 1112, and the distance L2 between the first coating film area marker 1211 and the second coating film area marker 1212 according to the transmission speed of the electrode sheet 10 and the interval time when the marker marks. The transmission speed of the electrode sheet 10 can be obtained through calculation after measuring the rotation speed of the roller. For example, Figure 2 or Figure 3In the embodiment shown, a first guide roller 110 is arranged upstream of the first stretching roller 40, a second guide roller 120 is arranged upstream of the first guide roller 110, and the first guide roller 110 and the second guide roller 120 are respectively arranged on opposite sides of the conveying path X, so that the conveying path X passes between the first guide roller 110 and the second guide roller 120, that is, during operation, the pole piece 10 passes between the first guide roller 110 and the second guide roller 120. The axial directions of the first guide roller 110 and the second guide roller 120 are both the same as the axial direction of the first stretching roller 40. Both ends of the first guide roller 110 in the axial direction can be rotatably connected to the machine frame, and both ends of the second guide roller 120 in the axial direction can be rotatably connected to the machine frame. The first marker 70 and the second marker 80 are located between the first guide roller 110 and the second guide roller 120 and above the pole piece 10. With such a design, it can be ensured that the pole piece 10 is more stable during transportation, and the first marker 70 and the second marker 80 are more accurate during marking. By measuring the rotation speed of the first guide roller 110 and combining with the radius of the first guide roller 110, the linear speed of the first guide roller 110 can be calculated, that is, the transmission speed of the pole piece 10. Since measuring the rotation speed of the first guide roller 110 is a conventional technique, it will not be described in detail in this application. In addition, the measurement method of the transmission speed of the pole piece 10 is not limited to the above one, and any other feasible method can also be used.

[0061] In one embodiment, a first detector 90 can also be arranged downstream of the third roller section 52 and the working direction is towards the coating area 12 of the pole piece 10 for detecting the coating area mark 121; a second detector 100 is arranged downstream of the fourth roller section 53 and the working direction is towards the tab area 11 of the pole piece 10 for detecting the tab area mark 111, as Figure 3 shown. The first detector 90 and the second detector 100 can be scanners such as high-speed cameras or charge-coupled devices, and can be fixedly connected to the machine frame by means of brackets or the like for identifying the marks on the pole piece 10. The scanner is communicatively connected to the processing device 240, and the processing device 240 can calculate the distance L3 between the first tab area mark 1111 and the second tab area mark 1112 and the distance L4 between the first coating area mark 1211 and the second coating area mark 1212 by identifying the interval time between the marks through the scanner. The specific principle can refer to the above embodiment and will not be elaborated here.

[0062] After calculating the distance L1 between the first tab area mark 1111 and the second tab area mark 1112, the distance L2 between the first coating film area mark 1211 and the second coating film area mark 1212, the distance L3 between the first tab area mark 1111 and the second tab area mark 1112, and the distance L4 between the first coating film area mark 1211 and the second coating film area mark 1212, the processing device 240 can calculate the elongation rate of the tab area 11 through the formula (L3 - L1) / L1, calculate the elongation rate of the coating film area 12 through the formula (L4 - L2) / L2, and finally calculate the elongation rate difference between the tab area 11 and the coating film area 12.

[0063] In one embodiment, a third idler roller 130 may be provided downstream of the second stretching roller 50, and a fourth idler roller 140 may be provided downstream of the third idler roller 130. The third idler roller 130 and the fourth idler roller 140 are respectively disposed on opposite sides of the conveying path X, so that the conveying path X passes between the third idler roller 130 and the fourth idler roller 140, that is, the pole piece 10 passes between the third idler roller 130 and the fourth idler roller 140. The axial directions of the third idler roller 130 and the fourth idler roller 140 are both the same as the axial direction of the second stretching roller 50. Both ends of the third idler roller 130 in the axial direction can be rotatably connected to the frame, and both ends of the fourth idler roller 140 in the axial direction can be rotatably connected to the frame. The first detector 90 and the second detector 100 are located between the third idler roller 130 and the fourth idler roller 140 and above the pole piece 10. With such a design, it can be ensured that the pole piece 10 is more stable when being conveyed, and the first detector 90 and the second detector 100 are more accurate when detecting marks.

[0064] In one embodiment, an adjusting device 150 may be provided. The adjusting device 150 may be a controller or the like, and is respectively communicatively connected to the processing device 240 and the adjusting driving device. The adjusting device 150 has a built-in threshold. After the processing device 240 calculates the elongation rate difference between the tab area 11 and the coating film area 12, it feeds the data back to the adjusting device 150. The adjusting device 150 compares the elongation rate difference with the built-in threshold, and sends a control signal to the corresponding adjusting driving device according to the comparison result to drive the first stretching roller 40 or the second stretching roller 50 to move, so as to automatically adjust the stretching tension applied by the first stretching roller 40 or the second stretching roller 50 to the pole piece 10.

[0065] In one embodiment, a first tension isolation roller 160 may be disposed on one side of the first passing roller 110. The first passing roller 110 and the first tension isolation roller 160 are respectively disposed on opposite sides of the conveying path X, and the first stretching roller 40 and the first tension isolation roller 160 are disposed on the same side of the conveying path X; and both the first passing roller 110 and the first tension isolation roller 160 are disposed upstream of the first stretching roller 40. The distance between the first passing roller 110 and the first tension isolation roller 160 forms a part of the conveying path X. During operation, the pole piece 10 first crosses the second passing roller 120, then passes through the gap between the first passing roller 110 and the first tension isolation roller 160, and then crosses the first stretching roller 40. A second tension isolation roller 180 is disposed on one side of the third passing roller 130. The second stretching roller 50 and the third passing roller 130 are respectively disposed on opposite sides of the conveying path X, and the second stretching roller 50 and the second tension isolation roller 180 are disposed on the same side of the conveying path X; and both the second stretching roller 50 and the second tension isolation roller 180 are disposed downstream of the second stretching roller 50. The distance between the second stretching roller 50 and the second tension isolation roller 180 forms a part of the conveying path X. During operation, the pole piece 10 that has passed through the roller pressing device 30 first crosses the second stretching roller 50, then passes through the gap between the second stretching roller 50 and the third passing roller 130, and then is conveyed to the winding roller 22. The first tension isolation roller 160 and the second tension isolation roller 180 are provided. On the one hand, they can play a role in isolating the tension. On the other hand, they can also ensure that the pole piece 10 is conveyed more stably. In addition, the first tension isolation roller 160 can also flatten the pole piece 10 to ensure the flatness of the pole piece 10 after the laser marking of the pole piece 10 by the laser.

[0066] In one embodiment, a plurality of passing rollers may also be provided along the conveying path X, such as Figure 2 or Figure 3As shown in the figure, a fifth idler roll 170 can be provided between the downstream of the first stretching roll 40 and the upstream of the rolling device 30, a sixth idler roll 190 can be provided between the downstream of the rolling device 30 and the upstream of the second stretching roll 50, a seventh idler roll 200 can be provided between the downstream of the fifth idler roll 170 and the upstream of the rolling device 30, an eighth idler roll 210 can be provided between the downstream of the rolling device 30 and the upstream of the sixth idler roll 190, a ninth idler roll 220 can be provided upstream of the second idler roll 120, a tenth idler roll 230 can be provided downstream of the fourth idler roll 140, etc. The axial direction of each idler roll is the same as that of the first stretching roll 40 or the second stretching roll 50, and both ends of the axis can be rotatably connected to the frame. The conveying path X bypasses from below the ninth idler roll 220 from the unwinding roll 21 and then passes between the ninth idler roll 220 and the second idler roll 120, between the second idler roll 120 and the first idler roll 110, between the first idler roll 110 and the first tension isolation roll 160, between the first idler roll 110 and the first stretching roll 40, between the first stretching roll 40 and the fifth idler roll 170, below the seventh idler roll 200, between the first rolling roll 31 and the second rolling roll 32, below the eighth idler roll 210, between the sixth idler roll 190 and the second stretching roll 50, between the second stretching roll 50 and the third idler roll 130, between the second tension isolation roll 180 and the third idler roll 130, between the third idler roll 130 and the fourth idler roll 140, between the fourth idler roll 140 and the tenth idler roll 230, and below the tenth idler roll 230. Setting multiple idler rolls can improve the smoothness of the electrode sheet 10 during the conveying process. In specific implementation, the number and installation position of the idler rolls are not limited and can be set according to specific needs.

[0067] Next, the working principle of the electrode sheet manufacturing equipment shown in Figure 2 and Figure 3 will be introduced:

[0068] During the production process, the pole piece 10 between die-cutting processes is wound around the unwinding roller 21. During installation, the starting end of the pole piece 10 in the unwinding roller 21 is stretched along the conveying path X and wound around the winding roller 22 for several turns. Subsequently, driven by the winding roller 20, the unwinding roller 21 starts continuous unwinding. As the tape runs, the pole piece 10 successively passes between the ninth idler roller 220 and the second idler roller 120, and between the second idler roller 120 and the first idler roller 110. The processing device 240 sends signals to the first marker 70 and the second marker 80 above the pole piece 10 to mark the pole piece 10. Among them, the first marker 70 marks the coating area 12 of the pole piece 10 as the first coating area mark 1211; the second marker 80 marks the tab area 11 of the pole piece 10 as the first tab area mark 1111. After the pole piece 10 runs for a certain distance, the first marker 70 marks the coating area 12 of the pole piece 10 again as the second coating area mark 1212; the second marker 80 marks the tab area 11 of the pole piece 10 again as the second tab area mark 1112. The processing device 240 calculates the distance L1 between the first tab area mark 1111 and the second tab area mark 1112 and the distance L2 between the first coating area mark 1211 and the second coating area mark 1212.

[0069] After the pole piece 10 passes between the second idler roller 120 and the first idler roller 110, it is pre-stretched by the first stretching roller 40. At this time, certain elongation will occur in each tab area 11 of the pole piece 10, while the coating area 12 has a larger thickness and greater strength, so the elongation is generally very small. When the pole piece 10 passes through the rolling device 30, the first rolling roller 31 and the second rolling roller 32 perform rolling and extension on the pole piece 10. Because the tab area 11 has a small thickness, the rolling roller generally cannot contact the tab area 11, so the tab area 11 is less stressed and has less elongation; while the coating area 12 has a large thickness and is more stressed, causing larger elongation in each coating area 12.

[0070] After that, the second stretching roller 50 performs secondary stretching on the pole piece 10, and the stretching principle is the same as that of the first stretching roller 40, mainly stretching the tab area 11.

[0071] Subsequently, the pole piece 10 passes between the third idler roller 130 and the fourth idler roller 140, and the detector above the pole piece 10 detects the marks on the pole piece 10. Among them, the first detector 90 detects the first coating area mark 1211 and the second coating area mark 1212 on the coating area 12, and the second detector 100 detects the first tab area mark 1111 and the second tab area mark 1112 on the tab area 11; the processing device 240 calculates the distance L3 between the first tab area mark 1111 and the second tab area mark 1112 and the distance L4 between the first coating area mark 1211 and the second coating area mark 1212 according to the detection signals of the first detector 90 and the second detector 100.

[0072] The processing device 240 calculates the elongation difference between the tab area 11 and the coating film area 12. The elongation calculation formula for the tab area 11 is: (L3 - L1) / L1; the elongation calculation formula for the coating film area 12 is: (L4 - L2) / L2. The calculation formula for the elongation difference between the coating film area 12 and the tab area 11 is: the elongation of the coating film area - the elongation of the tab area. Then the processing device 240 feeds back the elongation difference to the adjustment device 150 for determination.

[0073] Generally, the range of the elongation difference between the normal coating film area 12 and the tab area 11 is -0.2% to 0.2%. When the elongation difference is greater than 0.2%, it indicates insufficient stretching of the tab area 11. Therefore, when the adjustment device 150 determines that the received elongation difference is greater than 0.2%, the adjustment device 150 sends a control signal to the adjustment drive device of the first stretching roller 40 and / or the adjustment drive device of the second stretching roller 50, and adjusts the first stretching roller 40 or the second stretching roller 50 to move upward to increase the stretching tension of the electrode sheet 10, thereby increasing the elongation of the tab area 11. Then the processing device 240 sends signals to the first marker 70 and the second marker 80 above the electrode sheet 10 again to mark the electrode sheet 10, and repeats the above subsequent steps until the adjustment device 150 determines that the received elongation difference is not greater than 0.2%, and the adjustment device 150 stops adjusting.

[0074] Similarly, when the elongation difference is less than -0.2%, it indicates overstretching of the tab area 11. Therefore, when the adjustment device 150 determines that the received elongation difference is less than -0.2%, the adjustment device 150 sends a control signal to the adjustment drive device of the first stretching roller 40 and / or the adjustment drive device of the second stretching roller 50, and adjusts the first stretching roller 40 or the second stretching roller 50 to move downward to reduce the stretching tension of the electrode sheet 10, thereby reducing the elongation of the tab area 11. Then the processing device 240 sends signals to the first marker 70 and the second marker 80 above the electrode sheet 10 again to mark the electrode sheet 10, and repeats the above subsequent steps until the adjustment device 150 determines that the received elongation difference is not less than -0.2%, and the adjustment device 150 stops adjusting.

[0075] Through the above solution, the elongation difference between the tab area 11 and the coating film area 12 can be reduced, the closed-loop control of the elongation of the electrode sheet 10 can be achieved, and problems such as wrinkles in the tab area 11 or the coating film area 12 and breakage of the electrode sheet 10 can be effectively avoided. At the same time, if the stretching tension of the stretching roller is set to be automatically adjusted, the manual adjustment during the roller pressing process can also be reduced, the adjustment accuracy is higher, and the operability is better.

[0076] It should be noted that the range of the elongation difference between the above-mentioned coating film area 12 and the tab area 11 is only an example, and it is not limited to the range of -0.2% to 0.2%. The specific range can be adjusted according to needs. For example, it can also be adjusted to -0.1% - 0.1%, -0.05% - 0.05%, etc.

[0077] As mentioned above, it is only a partial implementation manner of the embodiments of this application, and it does not impose any formal restrictions on this application. The protection scope of the embodiments of this application is not limited to this. Any simple modifications, equivalent changes, and decorations that can be easily thought of by those skilled in the technical field of this application within the technical scope disclosed by the embodiments of this application should be covered within the protection scope of the embodiments of this application.

Claims

1. A pole piece manufacturing device, characterized in that: The pole piece (10) has a pole ear area (11) and a coating area (12), the pole piece manufacturing equipment has a conveying path (X), and the pole piece manufacturing equipment comprises: A conveying device (20) for driving the pole piece (10) to move along the conveying path (X); A rolling device (30), arranged on the conveying path (X), for rolling the coating area (12); A first stretching roller (40), arranged along the conveying path (X) upstream of the rolling device (30), the first stretching roller (40) being provided with a first protruding structure (41) on the outer periphery of the first stretching roller (40) for stretching the tab region (11); A second stretching roller (50), arranged along the conveying path (X) downstream of the rolling device (30), the second stretching roller (50) being provided with a second protruding structure (51) on the outer periphery of the second stretching roller (50) for stretching the tab region (11); A heating device (60) is arranged outside the first stretching roller (40) and opposite to the first protruding structure (41), and / or is arranged outside the second stretching roller (50) and opposite to the second protruding structure (51).

2. The pole piece manufacturing equipment according to claim 1, characterized in that: The heating device (60) comprises a first heater (61) and a second heater (62), wherein the first heater (61) is arranged opposite to the first protruding structure (41), and the second heater (62) is arranged opposite to the second protruding structure (51).

3. The pole piece manufacturing equipment according to claim 1, characterized in that: Along the axial direction of the first stretching roller (40), the first stretching roller (40) comprises a first roller segment (42) and a second roller segment (43) which are alternately distributed, the first roller segment (42) and the second roller segment (43) are connected, and the first protruding structure (41) is protrudingly arranged on the outer periphery of the second roller segment (43); The pole piece manufacturing equipment further comprises a first marker (70) and a second marker (80); Along the conveying path (X), the first marker (70) is arranged upstream of the first roller segment (42) and is used to set a coating area mark (121) on the coating area (12); The second marker (80) is arranged upstream of the second roller segment (43) and is used to set a pole lug region mark (111) in the pole lug region (11).

4. The pole piece manufacturing equipment according to claim 3, characterized in that: The first marker (70) and / or the second marker (80) is a laser.

5. The pole piece manufacturing equipment according to claim 3, characterized in that: Along the axial direction of the second stretching roller (50), the second stretching roller (50) comprises a third roller segment (52) and a fourth roller segment (53) which are alternately distributed, the third roller segment (52) and the fourth roller segment (53) are connected, and the second protruding structure (51) is protrudingly arranged on the outer periphery of the fourth roller segment (53); The pole piece manufacturing equipment further comprises a first detector (90) and a second detector (100); Along the conveying path (X), the first detector (90) is arranged downstream of the third roller segment (52) for detecting the coating area mark (121); The second detector (100) is arranged downstream of the fourth roller segment (53) and is used to detect the tab area mark (111).

6. The pole piece manufacturing equipment according to claim 5, characterized in that: The first detector (90) and / or the second detector (100) is a scanner.

7. The pole piece manufacturing equipment according to claim 3, characterized in that: The pole piece manufacturing equipment further comprises a first roller (110) and a second roller (120), wherein the first roller (110) and the second roller (120) are arranged on opposite sides of the conveying path (X); Along the conveying path (X), the first roller (110) is arranged upstream of the first stretching roller (40), and the second roller (120) is arranged upstream of the first roller (110); The first marker (70) and the second marker (80) are located between the first roller (110) and the second roller (120).

8. The pole piece manufacturing equipment according to claim 5, characterized in that: The pole piece manufacturing equipment further comprises a third roller (130) and a fourth roller (140), wherein the third roller (130) and the fourth roller (140) are arranged on opposite sides of the conveying path (X); Along the conveying path (X), the third roller (130) is arranged downstream of the second stretching roller (50), and the fourth roller (140) is arranged downstream of the third roller (130); The first detector (90) and the second detector (100) are located between the third roller (130) and the fourth roller (140).

9. The pole piece manufacturing equipment according to claim 1, characterized in that: The pole piece manufacturing device has an adjustment direction (Z) perpendicular to the conveying path (X), The pole piece manufacturing equipment also includes an adjusting device (150), wherein the adjusting device (150) is used to drive the first stretching roller (40) and / or the second stretching roller (50) to move in the adjusting direction (Z) to adjust the magnitude of the stretching tension applied to the pole piece (10).

10. The pole piece manufacturing equipment according to claim 1, characterized in that: The electrode manufacturing equipment further comprises a first passing roller (110) and a first tension-breaking roller (160), wherein the first passing roller (110) and the first tension-breaking roller (160) are arranged on opposite sides of the conveying path (X), and the first stretching roller (40) and the first tension-breaking roller (160) are arranged on the same side of the conveying path (X); The first passing roller (110) and the first tension isolation roller (160) are both arranged upstream of the first stretching roller (40); The electrode manufacturing equipment further comprises a third roller (130) and a second tension-breaking roller (180), wherein the second stretching roller (50) and the third roller (130) are arranged on opposite sides of the conveying path (X), and the second stretching roller (50) and the second tension-breaking roller (180) are arranged on the same side of the conveying path (X); The third passing roller (130) and the second tension isolation roller (180) are both arranged downstream of the second stretching roller (50).

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