Rolling device

Abstract

The utility model discloses a rolling device which comprises a conveying device, a pre-rolling device and a main rolling device. The three groups of conveying devices comprise a first conveying device, a second conveying device and a third conveying device; the pre-rolling device is composed of an upper pre-pressing roller and a lower pre-pressing roller which are vertically distributed, and a first gap is formed between the upper pre-pressing roller and the lower pre-pressing roller. The main rolling device is composed of an upper main pressing roller and a lower main pressing roller which are distributed up and down, a second gap is formed between the upper main pressing roller and the lower main pressing roller, and the first gap and the second gap are located on the same horizontal plane; the first conveying device is located on the front side of the first gap, the second conveying device is located between the first gap and the second gap, the third conveying device is located on the rear side of the second gap, and the first conveying device improves the flow efficiency of the flaking and rolling procedures. The pre-pressing roller and the main pressing roller are matched to prevent material falling during rolling, and trapezoidal bulges are arranged on the pre-pressing roller and the main pressing roller to solve the problem of tab side wrinkles.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing technology, and in particular to a rolling device. Background Technology

[0002] The edge wrinkling problem caused by continuous rolling of electrode sheets during the manufacturing process of lithium-ion batteries is a pain point in the industry. This invention proposes a rolling device that can effectively solve this problem.

[0003] The invention patent with publication number CN105789551B discloses a battery electrode rolling device and rolling method. In the implementation of this patent, the position of the electrode is not positioned. In particular, the electrode enters and exits the pressure roller by using the free sliding method of the tray. Therefore, the electrode may be misaligned during the transmission process, which may lead to the deviation of the electrode entering the roller and cause the rolling pressure difference. In addition, the free sliding method may damage the electrode.

[0004] The electrode sheet described in this patent has tabs, and due to the thickness difference between the tab area and the coating area, there is still a problem of tab wrinkles after rolling.

[0005] This patent uses a single-roller pressing method, and the electrode sheet is in a cut state. In the current high-pressure, high-area-density technology, there may be a situation of material loss during the rolling process. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model proposes a roller pressing device.

[0007] This utility model proposes a roller pressing device, including a horizontal conveying device for conveying electrode sheets, and a main roller pressing device installed on the horizontal conveying device; the main roller pressing device includes an upper main pressing roller and a lower main pressing roller distributed vertically, and a driving component is installed on the main roller pressing device for driving the upper main pressing roller and the lower main pressing roller to rotate respectively; the outer surface of the upper main pressing roller and the lower main pressing roller are provided with a first annular protrusion, and the first annular protrusion corresponds to the thinning area and the empty foil area of ​​the electrode sheet.

[0008] By setting first annular protrusions on the surfaces of the upper and lower main pressure rollers, corresponding to the electrode thinning area and the empty foil area, pressure can be applied to the weak areas of the electrode in a targeted manner, avoiding wrinkles in the electrode tab area due to thickness differences, while improving the uniformity of roller pressing and reducing the risk of material dropping.

[0009] Preferably, on the horizontal conveying device, in its conveying direction, at a position in front of the main roller pressing device, a pre-roll pressing device is provided. The pre-roll pressing device includes an upper pre-pressing roller and a lower pre-pressing roller distributed vertically. Multiple sets of driving components are installed on the pre-roll pressing device, and the multiple sets of driving components are respectively used to drive the upper pre-pressing roller and the lower pre-pressing roller to rotate. The outer surfaces of the upper pre-pressing roller and the lower pre-pressing roller are provided with annular protrusions. There is a first gap between the upper pre-pressing roller and the lower pre-pressing roller. There is a second gap between the upper main pressing roller and the lower main pressing roller. The first gap and the second gap are located on the same horizontal plane.

[0010] The coordinated design of the pre-roll pressing device and the main rolling pressing device forms a graded rolling pressing process. The pre-pressing initially flattens the electrode sheet and releases stress, reducing the pressure load on the main pressing roller and effectively preventing material loss during the high-pressure compaction rolling process. At the same time, the double-gap coplanar design ensures the continuity of electrode sheet transmission.

[0011] Preferably, the horizontal conveying device is divided into three parts: a first conveying device, a second conveying device, and a third conveying device; the first conveying device is located in front of the first gap, the second conveying device is located between the first gap and the second gap, and the third conveying device is located behind the second gap.

[0012] The segmented conveyor structure enables precise control of the electrode conveying path. Combined with the positional layout of the pre-pressing and main pressing gaps, it optimizes the connection efficiency of the rolling process and reduces the transmission error of the electrode between multiple stations.

[0013] Preferably, the horizontal conveying device is provided with a positioning mechanism at the docking part of the first gap and the second gap. The positioning mechanism includes a plurality of clamping rollers distributed vertically. The plurality of clamping rollers are arranged at equal intervals along a straight line and their function is to position and convey the electrode sheet.

[0014] By using the mechanical positioning and equidistant arrangement of the clamping rollers, the electrode sheets are ensured to maintain precise alignment when entering and exiting the roller pressure gap, avoiding roller pressure differences caused by deviations in the entry roller angle, and improving the stability of electrode sheet transmission.

[0015] Preferably, the positioning mechanism comprises four groups: a first positioning mechanism, a second positioning mechanism, a third positioning mechanism, and a fourth positioning mechanism. The first positioning mechanism is located between the first conveying device and the first gap; the second positioning mechanism is located between the first gap and the second conveying device; the third positioning mechanism is located between the second conveying device and the second gap; and the fourth positioning mechanism is located between the second gap and the third conveying device.

[0016] A multi-level positioning mechanism forms a full-process positioning system, which performs position calibration at each key node from the electrode entering the pre-press to the completion of the main press, minimizing cumulative errors and ensuring consistent rolling quality.

[0017] Preferably, the horizontal conveying device includes a drive roller and a conveyor belt, wherein the drive roller can drive the conveyor belt and the clamping roller to rotate.

[0018] The combined design of the drive roller and the conveyor belt enables smooth and continuous conveying of the electrode sheets, while providing synchronous drive for the clamping roller, ensuring the coordination of positioning and transmission actions, and reducing mechanical wear and energy consumption.

[0019] Preferably, the conveyor belt has a micro-negative pressure function. During the electrode conveying process, the micro-negative pressure generates an adsorption effect to ensure that the electrode remains stable and does not shift.

[0020] The combination of micro-negative pressure adsorption technology and mechanical clamping forms a dual positioning guarantee, effectively overcoming the characteristics of thin and easily deformable electrodes. It is especially suitable for the stable transmission of high areal density electrodes, reducing quality defects caused by jitter or offset.

[0021] Preferably, the first conveying device is equipped with a rejection mechanism, which has a suction cup for adsorbing and removing defective electrodes with defects.

[0022] Online defect detection and rejection functions enable real-time quality control of the production process, preventing defective electrodes from entering subsequent processes and causing resource waste, thereby improving the overall yield.

[0023] Preferably, the outer surfaces of the upper pre-pressing roller and the lower pre-pressing roller are provided with a second annular protrusion; the second annular protrusion corresponds to the thinning area and the empty foil area of ​​the electrode sheet.

[0024] The second annular protrusion of the pre-pressing roller and the first annular protrusion of the main pressure roller form a gradient pressure structure, which performs progressive rolling pressure in the weak area of ​​the electrode sheet, further optimizes the stress distribution, reduces the risk of wrinkles, and improves the uniformity of electrode sheet elongation.

[0025] In this utility model, a roller pressing device is proposed, which improves the efficiency of the sheet making and roller pressing process through a first conveying device.

[0026] The problem of material falling off the electrode ear side is solved by using a combination of pre-press roller and main press roller, and by setting trapezoidal annular protrusions on the pre-press and main press rollers.

[0027] The conveying device is equipped with a slight negative pressure and clamping rollers, which stabilizes the position of the electrode sheet during the conveying process and ensures the consistency of the electrode sheet roller pressure.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is a main schematic diagram of the present invention;

[0030] Figure 2 This is a top view of the upper and lower preload rollers;

[0031] Figure 3 This is a top view of the upper and lower main pressure rollers;

[0032] The following are the labels in the diagram: 1. First conveying device; 12. First positioning mechanism; 14. Removing mechanism; 141. Suction cup; 2. Second conveying device; 221. Second positioning mechanism; 222. Third positioning mechanism; 3. Third conveying device; 32. Fourth positioning mechanism; 4. Pre-rolling device; 41. Upper pre-pressing roller; 42. Lower pre-pressing roller; 5. Main rolling device; 51. Upper main pressure roller; 52. Lower main pressure roller; 6. Drive roller; 7. Conveyor belt; 8. Annular protrusion. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] like Figures 1-3 The roller pressing device shown includes a horizontal conveying device, on which a pre-roll pressing device 4 and a main roller pressing device 5 are sequentially installed in the conveying direction. The pre-roll pressing device 4 includes an upper pre-pressing roller 41 and a lower pre-pressing roller 42 distributed vertically, and the main roller pressing device 5 includes an upper main pressing roller 51 and a lower main pressing roller 52 distributed vertically. Both the pre-roll pressing device 4 and the main roller pressing device 5 are equipped with driving components, and multiple sets of driving components are used to drive the upper pre-pressing roller 41, the lower pre-pressing roller 42, the upper main pressing roller 51, and the lower main pressing roller 52 to rotate.

[0035] The horizontal conveying device is divided into three parts: a first conveying device 1, a second conveying device 2, and a third conveying device 3. There is a first gap between the upper pre-pressing roller 41 and the lower pre-pressing roller 42. There is a second gap between the upper main pressure roller 51 and the lower main pressure roller 52. The first gap and the second gap are located on the same horizontal plane. The first conveying device 1 is located in front of the first gap, the second conveying device 2 is located between the first gap and the second gap, and the third conveying device 3 is located behind the second gap.

[0036] The horizontal conveying device is equipped with a positioning mechanism at the docking part with the first gap and the second gap. The positioning mechanism consists of several vertically distributed clamping rollers, which are equidistantly arranged in a straight line for positioning and conveying the electrode sheets.

[0037] The upper pre-pressing roller 41 and the upper main pressure roller 51 both rotate counterclockwise, while the lower pre-pressing roller 42 and the lower main pressure roller 52 both rotate clockwise. The upper pre-pressing roller 41 and the lower pre-pressing roller 42 transport the electrode sheet from the first conveying device 1 to the second conveying device 2, while the upper main pressure roller 51 and the lower main pressure roller 52 transport the electrode sheet from the second conveying device 2 to the third conveying device 3. Both the pre-pressing device 4 and the main pressing device 5 are equipped with driving components, which are used to drive the upper pre-pressing roller 41, the lower pre-pressing roller 42, the upper main pressure roller 51, and the lower main pressure roller 52 to rotate, respectively.

[0038] The first conveying device 1 is located in front of the first gap, the second conveying device 2 is located between the first gap and the second gap, and the third conveying device 3 is located behind the second gap.

[0039] Preferably, the conveyor belt 7 has a slight negative pressure to keep the adsorption electrode stationary during the conveying process.

[0040] Vacuum conveyor belts utilize slight negative pressure to adsorb the objects being transported. For example, in the field of lithium battery electrode transport, vacuum conveyor belts create negative pressure on the surface of the flat belt, allowing the electrodes to be adsorbed onto the conveyor belt surface, thus achieving stable transport and positioning of the electrodes. This effectively reduces friction and displacement of the electrodes during transport, improving transport efficiency and stability.

[0041] A negative pressure pump is installed in the conveyor belt 7 system, and connected to the adsorption chamber or adsorption tank under the belt via a pipeline. When the negative pressure pump is working, it extracts the air from the adsorption chamber, creating a micro-negative pressure environment. The micro-negative pressure generated in the adsorption chamber by the pump, along with the small holes in the chamber communicating with the belt surface, allows small electronic components to be adsorbed onto the belt, achieving stable conveying.

[0042] Preferably, the connecting parts of the conveying device with the first gap and the second gap are provided with positioning mechanisms. The positioning mechanisms consist of several vertically distributed clamping rollers, which are equidistantly arranged in a straight line for positioning and conveying the electrode sheets.

[0043] Preferably, the positioning mechanism comprises four sets: a first positioning mechanism 12, a second positioning mechanism 221, a third positioning mechanism 222, and a fourth positioning mechanism 32. The first positioning mechanism 12 is located between the first conveying device 1 and the first gap; the second positioning mechanism 221 is located between the first gap and the second conveying device 2; the third positioning mechanism 222 is located between the second conveying device 2 and the second gap; and the fourth positioning mechanism 32 is located between the second gap and the third conveying device 32.

[0044] Preferably, the conveying device includes a drive roller 6 and a conveyor belt 7, wherein the drive roller 6 can drive the conveyor belt 7 and the clamping roller to rotate.

[0045] After the electrode roll is identified and slit by the film-making CCD, it is made into an electrode sheet, which is then conveyed to the first conveying device 1.

[0046] Electrode production: The coated roll is processed by a laser slitting machine to produce electrode sheets that meet the process dimensions. After slitting, the electrode sheets are conveyed to the first conveying device 1. Before slitting, the coating roll is recorded with defect information by the CCD of the sheet making machine and fed back to the rejection mechanism 14.

[0047] The transmission roller 6 of the first conveying device 1 drives the conveyor belt 7 and the clamping roller to rotate. The conveyor belt 7 opens with a slight negative pressure to drive the electrode sheet to the position of the rejection mechanism 14. If the electrode sheet has defects, the suction cup 141 on the rejection mechanism 14 will suck up the electrode sheet.

[0048] Preferably, the first conveying device 1 is provided with a rejection mechanism 14, which has a suction cup 141 for removing defective electrode sheets.

[0049] Preferably, the outer surfaces of the upper pre-pressing roller 41, the lower pre-pressing roller 42, the upper main pressure roller 51, and the lower main pressure roller 52 are all provided with annular protrusions 8; the cross-section of the annular protrusion 8 is an isosceles trapezoid, and the length of the base near the axis is greater than the length of the base away from the axis. The annular protrusion 8 corresponds to the electrode thinning area and the empty foil area.

[0050] The first clamping roller 12 clamps the electrode sheet and feeds it into the pre-rolling device 4. The pre-rolling device 4 rolls the electrode sheet, and the annular protrusion 8 on the upper pre-rolling roller corresponds to the annular protrusion 8 on the lower pre-rolling roller 42. They work together to thin and leave blank areas of the electrode sheet, ensuring that the electrode sheet is stretched evenly and achieving the pre-pressing effect.

[0051] The transmission roller 6 of the second conveying device 2 drives the conveyor belt 7 and the second clamping roller 221 to rotate. The second clamping roller 221 steadily clamps the electrode sheet after it has been rolled by the pre-rolling device 4. The conveyor belt 7 turns on a slight negative pressure, and the third clamping roller 222 sends the electrode sheet into the main rolling device 5.

[0052] The main roller pressing device 5 presses the electrode sheet, and the annular protrusion 8 on the upper main roller 52 corresponds to the annular protrusion 8 on the lower main roller 52. Together they work on the thinning and blanking areas of the electrode sheet to ensure that the electrode sheet is stretched evenly and achieve the final rolling effect.

[0053] The transmission roller 6 on the third conveyor 3 drives the conveyor belt 7 and the fourth clamping roller 32 to rotate. The fourth clamping roller 32 steadily clamps the electrode sheet after it has been rolled by the main roller pressing device 5. The conveyor belt 7 turns on a slight negative pressure to send the electrode sheet to the next process.

[0054] The annular protrusions 8 on the pre-rolling device 4 and the main rolling device 5 in this invention can be set to a certain number, thereby enabling the simultaneous rolling of several electrode sheets and greatly improving the rolling efficiency.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A roller pressing device, characterized in that: The device includes a horizontal conveying device for conveying electrode sheets, and a main roller pressing device (5) is installed on the horizontal conveying device. The main roller pressing device (5) includes an upper main pressing roller (51) and a lower main pressing roller (52) distributed vertically. A driving component is installed on the main roller pressing device (5) to drive the upper main pressing roller (51) and the lower main pressing roller (52) to rotate, respectively. The outer surfaces of the upper main pressing roller (51) and the lower main pressing roller (52) are provided with a first annular protrusion (81), and the first annular protrusion (81) corresponds to the thinning area and the empty foil area of ​​the electrode sheet.

2. The roller pressing device according to claim 1, characterized in that, On the horizontal conveying device, in its conveying direction, at the position in front of the main roller pressing device (5), a pre-roll pressing device (4) is provided. The pre-roll pressing device (4) includes an upper pre-pressing roller (41) and a lower pre-pressing roller (42) distributed vertically. Multiple sets of driving components are installed on the pre-roll pressing device (4). The multiple sets of driving components are used to drive the upper pre-pressing roller (41) and the lower pre-pressing roller (42) to rotate respectively. The outer surfaces of the upper pre-pressing roller (41) and the lower pre-pressing roller (42) are provided with annular protrusions (8). There is a first gap between the upper pre-pressing roller (41) and the lower pre-pressing roller (42). There is a second gap between the upper main pressing roller (51) and the lower main pressing roller (52). The first gap and the second gap are located on the same horizontal plane.

3. The roller pressing device according to claim 2, characterized in that, The horizontal conveying device is divided into three parts: a first conveying device (1), a second conveying device (2), and a third conveying device (3); the first conveying device (1) is located in front of the first gap, the second conveying device (2) is located between the first gap and the second gap, and the third conveying device (3) is located behind the second gap.

4. The roller pressing device according to claim 3, characterized in that, The horizontal conveying device is equipped with a positioning mechanism at the docking part with the first gap and the second gap. The positioning mechanism includes a plurality of clamping rollers distributed vertically. The plurality of clamping rollers are arranged at equal intervals along a straight line and their function is to position and convey the electrode sheet.

5. A roller pressing device according to claim 4, characterized in that, The positioning mechanism is provided in four groups, namely a first positioning mechanism (12), a second positioning mechanism (221), a third positioning mechanism (222) and a fourth positioning mechanism (32). The first positioning mechanism (12) is located between the first conveying device (1) and the first gap; the second positioning mechanism (221) is located between the first gap and the second conveying device (2); the third positioning mechanism (222) is located between the second conveying device (2) and the second gap; and the fourth positioning mechanism (32) is located between the second gap and the third conveying device (3).

6. The roller pressing device according to claim 1, characterized in that, The horizontal conveying device includes a drive roller (6) and a conveyor belt (7), wherein the drive roller (6) can drive the conveyor belt (7) and the clamping roller to rotate.

7. A roller pressing device according to claim 6, characterized in that, The conveyor belt (7) has a micro negative pressure function. During the electrode conveying process, the micro negative pressure generates an adsorption effect to ensure that the electrode remains stable and does not shift.

8. A roller pressing device according to claim 3, characterized in that, The first conveying device (1) is equipped with a rejection mechanism (14), which is provided with a suction cup (141) for adsorbing and removing defective electrode sheets with defects.

9. A roller pressing device according to claim 2, characterized in that, The outer surfaces of the upper pre-pressing roller (41) and the lower pre-pressing roller (42) are provided with a second annular protrusion (82); the second annular protrusion (82) corresponds to the thinning area and empty foil area of ​​the electrode sheet.

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