Calendering mechanism for pole piece rolling

Abstract

The utility model relates to the field of pole piece processing equipment, and discloses a calendaring mechanism for pole piece rolling, which comprises two support plates arranged oppositely, a rubber roller for supporting a pole piece body is rotatably arranged between the two support plates, a liftable bracket is arranged above the rubber roller, and the rubber roller is arranged above the bracket. The support is provided with a calendering wheel capable of calendering the tab area of the pole piece body together with the rubber roller, and one side of the support plate is also provided with a driving assembly for driving the support to move along the axial direction of the rubber roller. The calendering wheel is arranged above the rubber roller, so that the tab area of the pole piece body can be subjected to calendering operation before rolling, a stress space generated when the coating area of the pole piece body is rolled is released in advance, and the flatness of the surface of the pole piece body after rolling is ensured; the position of the support in the horizontal transverse direction is adjusted through the driving assembly, so that the mechanism can be suitable for calendaring the tab area of the pole piece bodies with different widths.

Description

Technical Field

[0001] The utility model relates to the field of pole piece processing equipment, in particular to a calendering mechanism for pole piece rolling. Background Art

[0002] Pole sheet rolling is an important process in the manufacturing process of lithium-ion batteries. Its main function is to increase the density and compaction of the pole sheet, thereby improving the energy density and cycle life of the battery. After the pole sheet is coated, there are some micropores and bubbles on its surface. If it is not rolled, these micropores and bubbles will affect the performance of the battery. By rolling, the micropores and bubbles in the pole sheet can be squeezed out to make the pole sheet more compact. At the same time, rolling can also make the contact between the active material in the pole sheet and the current collector closer, thereby improving the conductivity and electrochemical performance of the battery.

[0003] The pole lug area is a part of the pole piece, usually located on both sides of the pole piece coating area, and is used to connect the pole piece and the battery casing to realize the conduction of current from the pole piece to the battery casing for charging and discharging.

[0004] However, during the electrode sheet rolling process, since the pole lug area is relatively thin, it cannot contact the roller when the pole sheet is coated on both sides; therefore, the coated area is subjected to the pressure of the roller, and inconsistent surface density will cause inconsistent stress on the pole sheet. After the stress is released, the pole sheet surface will be uneven and the pole lug area will be wrinkled, which will ultimately affect the performance and safety of the battery. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a calendering mechanism for rolling a pole piece, by means of a calendering wheel arranged above a rubber roller, a pressing operation is performed on the pole ear area of ​​the pole piece body before rolling, so as to release the stress space generated when rolling the coating area of ​​the pole piece body in advance, and ensure the flatness of the surface of the pole piece body after rolling.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A rolling mechanism for rolling a pole piece comprises two support plates arranged opposite to each other, a rubber roller for supporting a pole piece body is rotatably mounted between the two support plates, a bracket capable of being raised and lowered is arranged above the rubber roller, a rolling wheel capable of rolling the pole ear area of ​​the pole piece body together with the rubber roller is mounted on the bracket, and a driving component for driving the bracket to move along the axis direction of the rubber roller is also arranged on one side of the support plate.

[0008] Optionally, the driving assembly includes a screw rod rotatably mounted on the support plate and parallel to the axis direction of the rubber roller, a sliding block is screwed onto the screw rod, a connecting frame is fixedly mounted on the lower end of the sliding block, a telescopic assembly perpendicular to the screw rod is mounted on the side of the connecting frame away from the screw rod, and the output end of the telescopic assembly is connected to the bracket.

[0009] Optionally, the two support plates are fixedly connected via a connecting plate parallel to the screw rod, and the connecting plate is slidably connected to the connecting frame via a slide rail assembly.

[0010] Optionally, one end of the screw rod is connected to the connecting plate, and the other end passes through the supporting plate and is connected to a handwheel.

[0011] Optionally, a locking block is provided on a side of the support plate opposite to the sliding block, and a locking handle for locking the screw rod is provided on the locking block.

[0012] Optionally, a position display capable of displaying the position of the sliding block is provided between the locking block and the hand wheel.

[0013] Optionally, the connecting frame adopts a U-shaped structure, and the connecting plate is inserted between the two ends of the connecting frame.

[0014] Optionally, two groups of the brackets and the calendering wheels are provided, and each group of the brackets is provided with a corresponding driving assembly and telescopic assembly that are independently driven.

[0015] Beneficial Effects

[0016] (1) The utility model arranges a calendering wheel above the rubber roller, so as to perform a calendering operation on the pole ear area of ​​the pole piece body before rolling, thereby releasing the stress space generated when rolling the coating area of ​​the pole piece body in advance, and ensuring the flatness of the surface of the pole piece body after rolling; wherein the pressing force of the calendering wheel on the pole ear area can be controlled by the lifting and lowering displacement of the bracket, and the horizontal position of the bracket is adjusted by the driving component, so that the mechanism can be suitable for calendering the pole ear area of ​​pole pieces of different widths; by calendering the pole ear area in advance by the mechanism, it is possible to avoid the unevenness of the surface of the pole piece body after the stress is released, prevent wrinkles in the pole ear area, ensure the flatness of the surface of the pole piece body, and avoid affecting the performance and safety of the battery.

[0017] (2) The driving assembly in the utility model adopts a structure in which a screw rod and a sliding block are screwed together, and the horizontal position adjustment of the calendering wheel is indirectly achieved by driving the connecting frame to move. The mechanical structure is simple and the operation and maintenance are convenient, which greatly improves the practicality of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the process structure of rolling the pole piece body;

[0020] Among them, 1. support plate; 2. rubber roller; 3. pole piece body; 31. coating area; 32. pole ear area; 4. bracket; 5. calendering wheel; 6. connecting plate; 7. driving assembly; 71. screw rod; 72. sliding block; 73. connecting frame; 74. hand wheel; 75. locking block; 76. position display; 8. slide rail assembly; 9. telescopic assembly; 10. lower roller; 11. upper roller. DETAILED DESCRIPTION

[0021] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] Embodiment 1

[0023] like Figure 1 As shown, a calendering mechanism for rolling a pole piece comprises two support plates 1 arranged opposite to each other, the two support plates 1 are fixedly connected by a connecting plate 6, and a rubber roller 2 is rotatably installed between the two support plates 1, and the rubber roller 2 is located below the connecting plate 6; a bracket 4 that can be raised and lowered is arranged above the rubber roller 2, and a calendering wheel 5 is installed on the bracket 4, and under the joint action of the rubber roller 2 and the calendering wheel 5, the pole ear area 32 of the pole piece body 3 can be calendered.

[0024] As mentioned above, the pole piece body 3 has a coating area 31 and a pole ear area 32, and the pole ear area 32 is located on one side of the coating area 31; the pole piece body 3 is moved to the roller press to be rolled under the drive of the external wheel group, and the rubber roller 2 is arranged at the front end of the rolling place. When the pole piece body 3 moves, the rubber roller 2 is passively driven through the pole piece body 3 belt transmission, and the calendering wheel 5 rises and falls synchronously with the bracket 4. When the outer circumferential surface of the calendering wheel 5 is in contact with the pole ear area 32, under the support of the rubber roller 2, the calendering wheel 5 and the rubber roller 2 can calender the pole ear area 32 between the two, and release the stress space generated by the coating area 31 during rolling in advance, so as to ensure the flatness of the surface of the pole piece body 3 after rolling.

[0025] Among them, the calendering wheel 5 is rotatably installed on the bracket 4, the lower part of the calendering wheel 5 protrudes from the bracket 4, and the axis of the calendering wheel 5 is parallel to the axis of the rubber roller 2; the bracket 4 is installed at the output end of the telescopic component 9, the telescopic component 9 is connected to the support plate 1, and the telescopic component 9 preferably adopts a cylinder, which can drive the bracket 4 to rise and fall in the height direction; since the calendering wheel 5 can be raised and lowered synchronously with the bracket 4, the pressing force of the calendering wheel 5 on the pole ear area 32 can be controlled by the lifting and lowering of the bracket 4, that is, the pressing force can be controlled by the air pressure regulating valve of the cylinder.

[0026] In order to adapt to pole piece bodies 3 of different widths, that is, to ensure that the calendering wheel 5 can be accurately pressed against the pole ear area 32 of the pole piece body 3, a driving component 7 for driving the bracket 4 to move along the axial direction of the rubber roller 2 is also provided on one side of the support plate 1. The driving component 7 drives the bracket 4 to move horizontally, which can indirectly drive the calendering wheel 5 to move along the axial direction of the rubber roller 2, so that the mechanism can be suitable for pole piece bodies 3 of different widths to perform calendering work in the pole ear area 32.

[0027] As mentioned above, the driving assembly 7 includes a screw rod 71, a sliding block 72 and a connecting frame 73. The screw rod 71 is parallel to the connecting plate 6, and one end of the screw rod 71 is connected to the connecting plate 6, and the other end passes through the support plate 1 and is connected to a hand wheel 74. Under the support of the support plate 1 and the connecting plate 6, the screw rod 71 can be rotated around its own axis by turning the hand wheel 74; the sliding block 72 is screwed and sleeved on the screw rod 71, that is, as the screw rod 71 rotates, the sliding block 72 can move linearly along the axis direction of the screw rod 71; the connecting frame 73 adopts a U-shaped structure, and one end of the connecting frame 73 is fixedly connected to the sliding block 72, and the other end bypasses the connecting plate 6 from below and is connected to the telescopic assembly 9, that is, the connecting plate 6 is passed between the two ends of the connecting frame 73.

[0028] The sliding block 72, the connecting frame 73 and the telescopic component 9 can move synchronously along the axial direction of the screw rod 71; the screw rod 71 is rotated by turning the hand wheel 74, and the sliding block 72 can move along the axial direction of the screw rod 71 at this time to drive the connecting frame 73 to move along the axial direction of the screw rod 71, and at the same time make the telescopic component 9 move accordingly, because the bracket 4 is connected to the output end of the telescopic component 9, the sliding block 72 can indirectly drive the bracket 4 and the calendering wheel 5 to move horizontally; through this structure, the calendering mechanism can be suitable for the calendering work of the pole ear area 32 of the pole piece body 3 with different widths, which greatly improves the application range of the mechanism.

[0029] Furthermore, in order to ensure the stability of the movement of the connecting frame 73, a slide rail assembly 8 is further provided between the connecting plate 6 and the connecting frame 73, that is, the connecting plate 6 and the connecting frame 73 are slidably connected by the slide rail assembly 8.

[0030] The slide rail assembly 8 is a common prior art, which includes a guide rail and a slider slidably installed on the guide rail. The guide rail here is fixedly installed on the connecting plate 6 and is parallel to the axial direction of the screw rod 71. The slider is fixedly installed on the inner side of the connecting frame 73. The slide rail assembly 8 can provide vertical support for the connecting frame 73 without affecting the horizontal movement of the connecting frame 73. Under the action of the slide rail assembly 8, the freedom of the sliding block 72 to rotate axially around the screw rod 71 can be limited so that it can only move axially.

[0031] Furthermore, in order to prevent accidental displacement of the calendering wheel 5, the hand wheel 74 is provided with a locking mechanism; the locking mechanism includes a locking block 75 and a locking handle, the locking block 75 is arranged on the side of the support plate 1 opposite to the sliding block 72, one end of the screw rod 71 passes through the support plate 1 and continues to pass through the locking block 75 and is connected to the hand wheel 74, and the locking handle is arranged on the locking block 75.

[0032] By rotating the lock handle, one end of the lock handle will move toward the inside of the locking block 75 until it contacts the screw rod 71, preventing it from rotating. Similarly, by rotating the lock handle in the opposite direction, the lock on the screw rod 71 can be released, and the screw rod 71 can be driven to rotate by the hand wheel 74.

[0033] In addition, a position display 76 capable of displaying the position of the sliding block 72 is provided between the locking block 75 and the hand wheel 74. By displaying the position of the sliding block 72 on the screw rod 71, the specific horizontal position of the calendering wheel 5 at this time can be known to facilitate the adjustment of its position. Since the position display 76 adopts the existing technology, its working principle will not be repeated here.

[0034] Embodiment 2

[0035] like Figure 2 As shown, the rolling process of the pole piece body 3 is performed. Under the drive of the main driving roller, it passes through the tension swing roller, the tension detection roller and other wheel groups in sequence, and then enters between the upper roller 11 and the lower roller 10 to be rolled. The calendering mechanism is arranged at the front end of the rolling station. Its purpose is to release the stress space generated by the rolling of the coating area 31 of the pole piece body 3 in advance, so as to ensure the flatness of the surface of the pole piece body 3 after rolling.

[0036] Embodiment 3

[0037] On the basis of the first and second embodiments, there are usually two pole ear areas 32 on the pole piece body 3, and the two pole ear areas 32 are symmetrically distributed on both sides of the coating area 31; for this type of situation, the bracket 4 and the calendering wheel 5 of the present mechanism can be correspondingly set in two groups, each group having one bracket 4, and each group of brackets 4 is provided with a corresponding driving component 7 and telescopic component 9 for independent driving.

[0038] As mentioned above, the lifting and lowering of each bracket 4 is driven by an independent telescopic component 9, and the horizontal movement is driven by an independent driving component 7. Based on this, the calendering mechanism can simultaneously perform calendering operations on the pole piece body 3 with two pole ear areas 32, and the actions of the two groups do not affect each other, which improves the application scope of the mechanism and can better realize the calendering of the pole ear area 32.

[0039] In summary, the rubber roller 2 is passively operated through the belt drive of the pole piece body 3, the calendering wheel 5 is adjusted up and down by the cylinder, the pressing force is controlled by the air pressure regulating valve of the cylinder, and the bracket 4 and the calendering wheel 5 of the calendering mechanism can be horizontally moved left and right through the driving component 7. In order to solve the problem of wrinkles in the pole ear area 32, the utility model calenders the pole ear area 32 before rolling the pole piece body 3, releases the stress space generated when rolling the coating area 31 in advance, ensures the surface flatness of the pole piece body 3 after rolling, so that it will not affect the performance and safety of the battery produced later.

[0040] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A rolling mechanism for rolling a pole piece, comprising two supporting plates (1) arranged opposite to each other, a rubber roller (2) for supporting a pole piece body (3) being rotatably mounted between the two supporting plates (1), characterized in that: A bracket (4) capable of being raised and lowered is arranged above the rubber roller (2), and a calendering wheel (5) capable of calendering the pole ear region (32) of the pole piece body (3) together with the rubber roller (2) is mounted on the bracket (4), and a driving component (7) for driving the bracket (4) to move along the axis direction of the rubber roller (2) is also arranged on one side of the support plate (1).

2. The rolling mechanism for rolling pole pieces according to claim 1, characterized in that: The driving assembly (7) comprises a screw rod (71) rotatably mounted on the support plate (1) and parallel to the axis direction of the rubber roller (2); a sliding block (72) is screwed onto the screw rod (71); a connecting frame (73) is fixedly mounted on the lower end of the sliding block (72); a telescopic assembly (9) perpendicular to the screw rod (71) is mounted on a side of the connecting frame (73) away from the screw rod (71); and an output end of the telescopic assembly (9) is connected to the bracket (4).

3. The rolling mechanism for rolling pole pieces according to claim 2, characterized in that: The two support plates (1) are fixedly connected via a connecting plate (6) parallel to the screw rod (71), and the connecting plate (6) and the connecting frame (73) are slidably connected via a slide rail assembly (8).

4. The rolling mechanism for rolling pole pieces according to claim 3, characterized in that: One end of the screw rod (71) is connected to the connecting plate (6), and the other end passes through the supporting plate (1) and is connected to a hand wheel (74).

5. The rolling mechanism for rolling pole pieces according to claim 4, characterized in that: A locking block (75) is provided on a side of the support plate (1) opposite to the sliding block (72), and a locking handle for locking the screw rod (71) is provided on the locking block (75).

6. The rolling mechanism for rolling pole pieces according to claim 5, characterized in that: A position display (76) capable of displaying the position of the sliding block (72) is provided between the locking block (75) and the hand wheel (74).

7. The rolling mechanism for rolling pole pieces according to claim 3, characterized in that: The connecting frame (73) adopts a U-shaped structure, and the connecting plate (6) is inserted between the two ends of the connecting frame (73).

8. The calendering mechanism for rolling pole pieces according to any one of claims 1 to 7, characterized in that: The bracket (4) and the calendering wheel (5) are provided in two groups, and each group of the bracket (4) is provided with a corresponding driving assembly (7) and telescopic assembly (9) that are independently driven.

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