Calendering roller group structure for dry-method pole piece calendaring

Abstract

The utility model discloses a calendaring roller group structure for dry-method pole piece calendaring, which is characterized in that a plurality of calendaring rollers are sequentially arranged along a main conveying direction X, and a roller gap is formed between every two adjacent calendaring rollers; the center shafts of the adjacent calendering rollers are arranged in a staggered mode in the vertical direction, the center shafts of the calendering rollers are arranged in a low-high interval staggered mode in the main conveying direction X. For the three continuously-arranged calendering rollers, the center shaft of the front calendering roller and the center shaft of the rear calendering roller are located on the same side of the center shaft of the middle calendering roller, and the center shaft of the middle calendering roller is located on the same side of the center shaft of the middle calendering roller. And the roller walking cambered surface of the electrode plate on the calendering roller is smaller than 1 / 2 of the circumferential surface. The plurality of calendering rollers are arranged in a low-high interval staggered manner, and the speed component of the speed of the electrode plate penetrating through the roller gap outlet in the main conveying direction is the same as the speed component of the speed of the electrode plate penetrating through the roller gap outlet in the main conveying direction, so that the production efficiency is improved, tiny cavities are prevented from appearing on the surface of the electrode plate, the surface uniformity of the electrode plate is improved, and the service life of the electrode plate is prolonged. The quality of the electrode plate is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of dry calendering equipment, in particular to a calendering roller group structure for dry pole piece calendering. Background Art

[0002] The dry process is to mix the active particles, conductive agent and dry-mix them evenly, then add the adhesive to form a self-supporting film under the fibrillation action of the adhesive, and finally roll it to cover the surface of the current collector.

[0003] Dry electrode technology has the advantages of lower cost, more environmental protection, more adaptable to large-scale production, higher energy density and better electrical performance. Dry electrodes have broad application prospects in next-generation batteries such as solid-state batteries.

[0004] Several calendering rollers of an existing multi-roll calender are usually arranged in a row along the main conveying direction, with the central axes of the calendering rollers located on the same plane. The arc surface of the electrode film on the calendering rollers is 1 / 2 of the circumference. This arrangement of calendering rollers results in uneven pressure generated during the calendering process, which can easily cause deformation of the electrode film. In addition, tiny cavities are likely to appear on the surface of the electrode film, affecting the surface uniformity of the electrode film, and further affecting the quality of the electrode film. Utility Model Content

[0005] In view of the shortcomings of the above-mentioned existing multi-roll calenders, the applicant provides a rationally structured calendering roller group structure for dry-process electrode sheet calendering, in which the calendering rollers are staggered, and the arc surface of the electrode sheet on the calendering roller is less than 1 / 2 of the circumference, thereby avoiding the appearance of tiny cavities on the electrode sheet, ensuring the uniformity of the electrode sheet surface, and ensuring the quality of the electrode sheet.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A calendering roller group structure for dry electrode sheet calendering, wherein a plurality of calendering rollers are arranged in sequence along a main conveying direction X, and roller gaps are provided between adjacent calendering rollers; the central axes of adjacent calendering rollers are arranged in a staggered manner in a vertical direction, and the central axes of the calendering rollers are arranged in a low-high staggered manner along the main conveying direction X; the central axes of the preceding calendering roller and the following calendering roller of the three calendering rollers arranged in succession are on the same side of the central axis of the middle calendering roller, and the roller arc surface of the electrode sheet on the calendering roller is less than 1 / 2 of the circumferential surface.

[0008] As a further improvement of the above technical solution:

[0009] The corresponding angle of the arc surface of the calendering roller is less than 180°, which is an obtuse angle.

[0010] After the electrode sheet passes through the adjacent calendering rollers, its moving speed V is decomposed into the horizontal velocity component V x The direction is the same as the main conveying direction X.

[0011] From front to back along the main conveying direction X, the radius of the last calendering roller is larger than the radius of the other calendering rollers.

[0012] Each calendering roller is connected to a motor separately and driven by an independent motor; the speed of each calendering roller is consistent.

[0013] From front to back along the main conveying direction X, the gap between adjacent calendering rollers remains unchanged or gradually decreases.

[0014] Along the main conveying direction X, the first calendering roller is provided with a back roller on the side opposite to the main conveying direction X, and the back roller is in close contact with the first calendering roller; the radius R4 of the back roller is greater than the radius R1 of the first calendering roller, and the back roller is a driven roller.

[0015] The central axes of the back roller and the first calendering roller are staggered in the vertical direction. The horizontal plane D passing through the central axis O4 of the back roller is located below the horizontal plane A passing through the central axis O1 of the first calendering roller. The angle γ between the line connecting the centers of the back roller and the first calendering roller and the line connecting the first calendering roller and the second calendering roller is an obtuse angle.

[0016] The first bearing and the second bearing are respectively sleeved on both ends of the roller body of the back roller from inside to outside in sequence; the first bearing is installed in the bearing seat, and the bearing seat is fixed on the frame; the second bearing is installed in the connecting seat, the connecting seat is connected to one end of the driving mechanism, and the driving mechanism is fixed on the frame.

[0017] The driving mechanism monitors the pressure in real time and adjusts the pressure according to the actual monitored pressure value; the driving mechanism adopts a hydraulic system or an actuator system.

[0018] The beneficial effects of the utility model are as follows:

[0019] Several calendering rollers of the utility model are arranged in a low-high interval staggered manner, so that the arc surface of the electrode sheet guided through the roller gap on the calendering roller is less than 1 / 2 of the circumferential surface, and the speed component of the electrode sheet passing through the roller gap outlet in the main conveying direction is the same as that in the main conveying direction. This same speed component is superimposed on the conveying speed in the main conveying direction, which not only increases the conveying speed, speeds up the rhythm of the electrode sheet being conveyed forward along the main conveying direction, and improves production efficiency, but also avoids the appearance of tiny cavities on the surface of the electrode sheet, improves the surface uniformity of the electrode sheet, and ensures the quality of the electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the multi-roller arrangement of the utility model.

[0021] Figure 2 It is a schematic diagram of the structure of the back roller.

[0022] In the figure: 1, first calendering roller; 2, second calendering roller; 3, third calendering roller; 4, back roller; 41, roller body; 42, first bearing; 43, bearing seat; 44, second bearing; 45, connecting seat; 46, driving mechanism; 101, first electrode sheet; 102, second electrode sheet. DETAILED DESCRIPTION

[0023] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0024] The utility model arranges a plurality of calendering rollers in sequence along the main conveying direction X, and the adjacent calendering rollers rotate in opposite directions (i.e., they rotate in opposite directions). For example, if the first calendering roller rotates clockwise, the second calendering roller rotates counterclockwise, and so on. There is a roller gap between adjacent calendering rollers, which is used to gradually calender the dry electrode material into a finished electrode sheet. The central axes of adjacent calendering rollers are staggered in the vertical direction, and the central axes of the calendering rollers are arranged in sequence in a staggered manner of "low-high-low-high..." along the main conveying direction X, and the connecting line of the central axes of the calendering rollers is in a low-high staggered wavy shape. For three calendering rollers arranged in succession, the central axis of the preceding calendering roller and the central axis of the succeeding calendering roller are on the same side of the central axis of the middle calendering roller, and are higher or lower than the central axis of the middle calendering roller: if the central axis of the middle calendering roller is in a low position, the central axis of the preceding calendering roller and the central axis of the succeeding calendering roller are both located above the central axis of the middle calendering roller, and are higher than the central axis of the middle calendering roller; on the contrary, if the central axis of the middle calendering roller is in a high position, the central axis of the preceding calendering roller and the central axis of the succeeding calendering roller are both located below the central axis of the middle calendering roller, and are lower than the central axis of the middle calendering roller. Several calendering rollers of the utility model are arranged in a low-high interval staggered manner, so that the arc surface of the electrode sheet guided through the roller gap on the calendering roller is less than 1 / 2 of the circumferential surface, and the speed component of the electrode sheet passing through the roller gap outlet in the main conveying direction is the same as that in the main conveying direction. This same speed component is superimposed on the conveying speed in the main conveying direction, which not only increases the conveying speed, speeds up the rhythm of the electrode sheet being conveyed forward along the main conveying direction, and improves production efficiency, but also avoids the appearance of tiny cavities on the surface of the electrode sheet, improves the surface uniformity of the electrode sheet, and ensures the quality of the electrode sheet.

[0025] Figure 1 An embodiment of the utility model is shown. The first calendering roller 1, the second calendering roller 2, and the third calendering roller 3 are arranged in sequence along the main conveying direction X, and the central axes of adjacent calendering rollers are staggered in the vertical direction. The horizontal plane A passing through the central axis O1 of the first calendering roller 1 and the horizontal plane C passing through the central axis O3 of the third calendering roller 3 are both located below the horizontal plane B passing through the central axis O2 of the second calendering roller 2. The horizontal plane A and the horizontal plane C can be at the same height in the vertical direction (i.e., the same horizontal plane) or staggered in the vertical direction (i.e., located at different horizontal planes). In this embodiment, the horizontal plane A and the horizontal plane C are also staggered.

[0026] The roll gap width between the first calendering roller 1 and the second calendering roller 2 is W1, and the roll gap width between the second calendering roller 2 and the third calendering roller 3 is W2, W2≤W1, that is, along the main conveying direction X from front to back, the roll gap between each adjacent calendering roller can remain unchanged or gradually decrease to meet the thickness requirements of multiple calendering and reduce the required rolling force.

[0027] The contact point between the first calendering roller 1 and the second calendering roller 2 is m, the contact point between the second calendering roller 2 and the third calendering roller 3 is p, and the electrode sheet outlet point of the third calendering roller 3 is q. The electrode material is pressed at the contact point m between the first calendering roller 1 and the second calendering roller 2 to form the first electrode sheet 101. The first electrode sheet 101 is transferred with the second calendering roller 2 to the contact point p between the second calendering roller 2 and the third calendering roller 3. After being pressed at the contact point p, the second electrode sheet 102 is formed. The second electrode sheet 102 is transferred with the third calendering roller 3 to the outlet point q of the third calendering roller 3 to be exported. After the first electrode sheet 101 passes through the contact point m, its movement speed V1 can be decomposed into a vertical downward speed component V 1y and a horizontal forward velocity component V 1x , V 1x The direction is the same as the main conveying direction X. After the second electrode sheet 102 passes through the pressure point p, its moving speed V2 can be decomposed into a vertical upward speed component V 2y and a horizontal forward velocity component V 2x , V 2x The direction is the same as the main conveying direction X. The arc surface S1 between the pressing point m and the pressing point p on the second calendering roller 2 is the arc surface of the first electrode sheet 101 on the second calendering roller 2. S1 is smaller than 1 / 2 of the circumference. The angle α corresponding to S1 is smaller than 180°, and α is an obtuse angle. The arc surface S2 between the pressing point p and the lead-out point q on the third calendering roller 3 is the arc surface of the second electrode sheet 102 on the third calendering roller 3. S2 is smaller than 1 / 2 of the circumference. The angle β corresponding to S2 is smaller than 180°, and β is an obtuse angle.

[0028] The first calendering roller 1, the second calendering roller 2, and the third calendering roller 3 are respectively connected to a motor and driven by independent motors, and the rotation speed and torque are independently controlled, and the speed of each calendering roller is consistent.

[0029] From front to back along the main conveying direction X, the radius of the last calendering roller is greater than the radius of the other calendering rollers, and the radius of the other calendering rollers may be equal or unequal. In this embodiment, the radius R1 of the first calendering roller 1 is equal to the radius R2 of the second calendering roller 2, and the radius R3 of the third calendering roller 3 is greater than the radius of the first calendering roller 1 and the second calendering roller 2. The last calendering roller has a larger radius and greater rigidity, and can withstand greater rolling force, which is conducive to improving the uniformity of the formed electrode sheet.

[0030] The first calendering roller 1 is provided with a back roller 4 on the side opposite to the main conveying direction X. The back roller 4 fits tightly with the first calendering roller 1. The horizontal plane D passing through the central axis O4 of the back roller 4 is located below the horizontal plane A passing through the central axis O1 of the first calendering roller 1, that is, the central axes of the back roller 4 and the first calendering roller 1 are staggered in the vertical direction; the angle γ between the O1-O4 line and the O1-O2 line is an obtuse angle. The radius R4 of the back roller 4 is larger than the radius R1 of the first calendering roller 1. The back roller 4 provides greater rigid support to the calendering roller, so that the calendering roller can withstand greater rolling force. The use of calendering rollers 1 and 2 with smaller diameters can increase the shear force of the material to improve the uniformity of the electrode sheet. The back roller 4 is a driven roller, which is not connected to the driving device and is driven to rotate by the first calendering roller 1.

[0031] like Figure 2 As shown, the first bearing 42 and the second bearing 44 are respectively sleeved on both ends of the roller body 41 of the back roller 4 from the inside to the outside, and there is a distance between the first bearing 42 and the second bearing 44. The first bearing 42 is installed in the bearing seat 43, and the bearing seat 43 is fixed on the frame. The second bearing 44 is installed in the connecting seat 45, and the connecting seat 45 is connected to one end of the driving mechanism 46, and the driving mechanism 46 is fixed on the frame. The driving mechanism 46 can pull the connecting seat 45 to move to eliminate the bearing clearance of the roller body 41, ensure the calendering accuracy, and prevent the first calendering roller 1 from moving laterally due to the rolling force and affecting the calendering accuracy. The driving mechanism 46 can monitor the pressure in real time, adjust the pressure according to the actual monitored pressure value, and ensure that the bearing clearance of the roller body 41 is eliminated in time. The driving mechanism 46 adopts a hydraulic system or an actuator system.

[0032] The above description is an explanation of the utility model, not a limitation of the utility model. The utility model can be modified in any form without violating the spirit of the utility model.

Claims

1. A calendering roller group structure for dry electrode calendering, wherein a plurality of calendering rollers are arranged in sequence along the main conveying direction X, and there is a roller gap between adjacent calendering rollers; characterized in that: The central axes of adjacent calendering rollers are staggered in the vertical direction, and the central axes of each calendering roller are arranged in a low-high staggered manner along the main conveying direction X. For the three calendering rollers arranged continuously, the central axis of the previous calendering roller and the central axis of the next calendering roller are on the same side of the central axis of the middle calendering roller, and the arc surface of the electrode sheet on the calendering roller is less than 1 / 2 of the circumferential surface.

2. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: The corresponding angle of the arc surface of the calendering roller is less than 180°, which is an obtuse angle.

3. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: After the electrode sheet passes through the adjacent calendering rollers, its moving speed V is decomposed into the horizontal velocity component V x The direction is the same as the main conveying direction X.

4. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: From front to back along the main conveying direction X, the radius of the last calendering roller is larger than the radius of the other calendering rollers.

5. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: Each calendering roller is connected to a motor separately and driven by an independent motor; the speed of each calendering roller is consistent.

6. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: From front to back along the main conveying direction X, the gap between adjacent calendering rollers remains unchanged or gradually decreases.

7. The calendering roller group structure for dry electrode calendering according to claim 1, characterized in that: Along the main conveying direction X, the first calendering roller is provided with a back roller (4) on the side opposite to the main conveying direction X, and the back roller (4) is tightly fitted with the first calendering roller (1); the radius R4 of the back roller (4) is greater than the radius R1 of the first calendering roller (1), and the back roller (4) is a driven roller.

8. The calendering roller group structure for dry electrode calendering according to claim 7, characterized in that: The central axes of the back roller (4) and the first calendering roller (1) are offset from each other in the vertical direction; a horizontal plane D passing through the central axis O4 of the back roller (4) is located below a horizontal plane A passing through the central axis O1 of the first calendering roller (1); and an angle γ between a line connecting the centers of the back roller (4) and the first calendering roller (1) and a line connecting the first calendering roller (1) and the second calendering roller (2) is an obtuse angle.

9. The calendering roller group structure for dry electrode calendering according to claim 8, characterized in that: A first bearing (42) and a second bearing (44) are respectively sleeved on both ends of a roller body (41) of the back roller (4) from the inside to the outside in sequence; the first bearing (42) is installed in a bearing seat (43), and the bearing seat (43) is fixed on the frame; the second bearing (44) is installed in a connecting seat (45), and the connecting seat (45) is connected to one end of a driving mechanism (46), and the driving mechanism (46) is fixed on the frame.

10. The calendering roller group structure for dry electrode calendering according to claim 9, characterized in that: The driving mechanism (46) monitors the pressure in real time and adjusts the pressure according to the actual monitored pressure value; the driving mechanism (46) adopts a hydraulic system or an actuator system.

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