Diaphragm unwinding device and lamination equipment

Abstract

The utility model relates to the technical field of battery manufacturing equipment, and discloses a diaphragm unreeling device and lamination equipment, the diaphragm unreeling device is sequentially provided with an unreeling mechanism, a material receiving platform, a tension swing roller mechanism, a cache mechanism, a micro tension control mechanism and a diaphragm deviation rectifying mechanism along the moving direction of a diaphragm; the micro-tension control mechanism comprises a driving assembly, a tension roller and a swing rod. The tension roller is connected with the driving assembly through the swing rod, and the driving assembly is used for driving the swing rod to swing so that the tension roller can loosen or tension the diaphragm. According to the diaphragm unwinding device, the driving assembly is used for driving the swing rod to swing, so that the tension roller loosens or tensions the diaphragm, the tension of the diaphragm can be accurately controlled, fluctuation of the tension of the diaphragm is reduced, the diaphragm is prevented from being torn, and diaphragm unwinding is stable and high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing equipment technology, specifically to a separator unwinding device and a stacking device. Background Technology

[0002] In the battery production process, a diaphragm unwinding device is generally used to unwind the cell diaphragm.

[0003] During the unwinding process, if the tension of the diaphragm is too low, it may lead to problems such as diaphragm loosening or deviation, affecting the uniformity of diaphragm unwinding and resulting in poor unwinding performance. Therefore, existing diaphragm unwinding devices typically set a relatively high tension on the diaphragm during the unwinding process. However, setting a high tension can easily cause large tension fluctuations in the diaphragm, causing it to bear excessive tensile force and resulting in diaphragm tearing, thus leading to poor reliability of the diaphragm unwinding device. Utility Model Content

[0004] In view of this, the present invention provides a diaphragm unwinding device and a stacking device to solve the problem that the tension of the diaphragm fluctuates greatly during the unwinding process of the existing diaphragm unwinding device, the diaphragm is easy to tear, and the reliability of the diaphragm unwinding device is poor.

[0005] In the first aspect, this utility model provides a diaphragm unwinding device, which, along the moving direction of the diaphragm, is sequentially provided with: an unwinding mechanism, a receiving platform, a tension swing roller mechanism, a buffer mechanism, a micro-tension control mechanism, and a diaphragm correction mechanism;

[0006] The micro-tension control mechanism includes:

[0007] Driver components;

[0008] A tension roller and a swing arm, wherein the tension roller is connected to the drive assembly via the swing arm, and the drive assembly is used to drive the swing arm to swing so that the tension roller relaxes or tensions the diaphragm.

[0009] Secondly, this utility model also provides a stacking device, comprising:

[0010] Stacking table;

[0011] In the aforementioned diaphragm unwinding device, the stacking table is located on the side of the diaphragm correction mechanism away from the micro-tension control mechanism, and the diaphragm enters the stacking table after passing through the diaphragm correction mechanism.

[0012] Beneficial effects: This utility model uses an unwinding mechanism to unwind the diaphragm and provide the power for its movement. The diaphragm then enters the receiving platform for roll changing and tape connection. The tension swing roller mechanism adjusts the tension of the diaphragm behind the receiving platform in real time. A buffer mechanism cushions the diaphragm, effectively reducing external resistance during its operation. It compensates for the speed of the diaphragm in the unwinding mechanism and its speed when entering the stacking table. The drive component drives the swing arm to swing, causing the tension roller to relax or tighten the diaphragm. This allows for precise control of the diaphragm tension, reducing tension fluctuations and preventing diaphragm tearing. The unwinding of the diaphragm is stable and highly reliable. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a diaphragm unwinding device according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the micro-tension control mechanism of a diaphragm unwinding device according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1. Unwinding mechanism; 2. Receiving platform; 3. Tension swing roller mechanism; 4. Buffer mechanism; 401. First sub-roller; 402. Second sub-roller; 5. Micro-tension control mechanism; 501. Drive assembly; 5011. Telescopic component; 5012. Proportional valve; 502. Tension roller; 503. Swing rod; 504. Fixed shaft; 505. Forced roller; 6. Diaphragm correction mechanism; 7. Main drive mechanism; 701. Main drive roller; 702. Main and driven rollers; 8. Stacking table; 9. Diaphragm; 10. Reversing roller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] A battery cell includes the cell body, which comprises a separator and two electrodes with opposite polarities: a positive electrode and a negative electrode. The cell operates by the movement of metal ions between the positive and negative electrodes. The cell's cycling process involves metal ions moving from the positive electrode to the negative electrode and vice versa. The cell also includes tabs, which are electrically connected to the electrodes. The positive tab is connected to the positive electrode, and the negative tab is connected to the negative electrode. The cell charges and discharges through these tabs. Each electrode comprises a current collector and an active material layer coated on the surface of the current collector. If the electrode is a positive electrode, the current collector can be made of aluminum, and the active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. If the electrode is a negative electrode, the current collector can be made of copper, and the active material layer can be made of carbon or silicon, etc. The separator acts as an insulating layer to prevent short circuits inside the battery caused by contact between the positive and negative electrodes. It also acts as a semi-permeable layer to prevent larger molecules from passing through while allowing smaller charged ions to pass through.

[0020] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0021] According to embodiments of the present invention, on the one hand, such as Figure 1 As shown, a diaphragm unwinding device is provided, which includes, in sequence along the moving direction of the diaphragm 9: an unwinding mechanism 1, a receiving platform 2, a tension swing roller mechanism 3, a buffer mechanism 4, a micro-tension control mechanism 5, and a diaphragm correction mechanism 6.

[0022] Furthermore, the micro-tension control mechanism 5 includes: a drive assembly 501, a tension roller 502, and a swing arm 503. The tension roller 502 is connected to the drive assembly 501 via the swing arm 503. The drive assembly 501 is used to drive the swing arm 503 to swing, so that the tension roller 502 relaxes or tensions the diaphragm 9.

[0023] Therefore, the diaphragm unwinding device provided in this embodiment of the present invention unwinds the diaphragm 9 through the unwinding mechanism 1 and provides the power for the movement of the diaphragm 9. The diaphragm 9 then enters the receiving platform 2 for roll changing and tape connection. The tension swing roller mechanism 3 adjusts the tension of the diaphragm 9 in real time after entering the receiving platform 2. The buffer mechanism 4 buffers the diaphragm 9, effectively reducing external resistance during its operation and compensating for the speed of the diaphragm 9 at the unwinding mechanism 1 and its speed entering the stacking table 8. The drive component 501 drives the swing rod 503 to swing, causing the tension roller 502 to relax or tighten the diaphragm 9. This allows for precise control of the diaphragm 9 tension, reducing tension fluctuations and preventing tearing. The unwinding of the diaphragm 9 is stable and highly reliable. Furthermore, the diaphragm correction mechanism 6 ensures that the relative position of the diaphragm 9 is fixed, allowing the diaphragm 9 to stably enter the stacking table 8.

[0024] It should be noted that this embodiment of the invention does not limit the specific structure of the unwinding mechanism 1. Any existing structure can be selected as needed, such as an electric unwinding machine or a pneumatic unwinding device. Similarly, this embodiment of the invention does not limit the receiving platform 2 and the tension roller mechanism 3. For example, the receiving platform 2 can be a manual receiving platform. The tension roller mechanism 3 includes a cylinder, a control valve, and multiple guide rollers. The cylinder is electrically connected to the control valve. The extension and retraction end of the cylinder is equipped with an adjusting roller. The extension and retraction of the cylinder is controlled by the control valve, and the extension and retraction end drives the adjusting roller to move, thereby tensioning or relaxing the diaphragm 9, thus precisely controlling the unwinding tension of the diaphragm 9. The multiple guide rollers are used to support and transport the diaphragm 9.

[0025] In one embodiment, such as Figure 1 and Figure 2 As shown, the drive assembly 501 includes a telescopic member 5011 and a proportional valve 5012. The telescopic member 5011 is electrically connected to the proportional valve 5012. The proportional valve 5012 can precisely control the telescopic member 5011 to extend and retract, thereby driving the swing arm 503 to swing, which in turn controls the tension roller 502 to relax or tighten the diaphragm 9, controls the tension of the diaphragm 9, reduces the sudden change in directional tension, and improves the stability of the diaphragm 9 during transport.

[0026] Specifically, the telescopic component 5011 can be a conventional telescopic component such as a cylinder or a telescopic motor, and the proportional valve 5012 can be an electric proportional valve. In this respect, the present invention does not impose too many restrictions.

[0027] In addition, the diaphragm unwinding device can also be equipped with a tension sensor to detect the tension of the diaphragm 9 in real time. The tension sensor is electrically connected to the proportional valve 5012. The proportional valve 5012 adjusts the extension and retraction of the telescopic component 5011 according to the tension detected by the tension sensor to reduce tension fluctuations.

[0028] Furthermore, in one embodiment, such as Figure 2 As shown, the micro-tension control mechanism 5 also includes a fixed shaft 504, which is located on one side of the diaphragm 9. A swing arm 503 is rotatably mounted on the fixed shaft 504, which supports the swing arm 503. The swing arm 503 rotates around the fixed shaft 504 so that its two ends rotate in opposite directions. One end of the swing arm 503 is rotatably connected to the telescopic member 5011, and the other end is equipped with a tension roller 502.

[0029] When it is necessary to reduce the tension of the diaphragm 9, the extension component 5011 is stretched by the proportional valve 5012, and the end of the swing rod 503 connected to the tension roller 502 drives the tension roller 502 to relax the diaphragm 9, thereby reducing the tension of the diaphragm 9.

[0030] When it is necessary to increase the tension of the diaphragm 9, the expansion joint 5011 is controlled to contract by the proportional valve 5012, and the end of the swing rod 503 connected to the tension roller 502 drives the tension roller 502 to tighten the diaphragm 9, thereby increasing the tension of the diaphragm 9.

[0031] It should be noted that this embodiment of the invention does not restrict the rotatable manner of the swing arm 503 and the fixed shaft 504. Any existing rotation method can be selected as needed. For example, a circular hole is provided in the middle area of ​​the swing arm 503, and the fixed shaft 504 rotates relative to the swing arm 503 through the circular hole. Furthermore, multiple circular holes are provided on the swing arm 503, and the fixed shaft 504 can be installed on the corresponding circular holes as needed. This allows for precise control of the tension of the diaphragm 9 based on the distance of the lever arm and the extension / retraction amount of the telescopic component 5011.

[0032] Furthermore, in one embodiment, such as Figure 2 As shown, a force-receiving roller 505 is provided at one end of the swing arm 503 near the telescopic member 5011, and the force-receiving roller 505 is hinged to the telescopic end of the telescopic member 5011. By hinged the force-receiving roller 505 to the telescopic end of the telescopic member 5011, direct frictional contact between the telescopic end of the telescopic member 5011 can be avoided, reducing wear on the telescopic end of the telescopic member 5011 and the swing arm 503, and extending service life. The force-receiving roller 505 can also play a buffering role, absorbing the impact force during the movement. In addition, setting the force-receiving roller 505 is also conducive to improving the movement accuracy, that is, improving the control accuracy of the tension of the diaphragm 9.

[0033] In one embodiment, such as Figure 1 As shown, a pair of micro-tension control mechanisms 5 are provided, and the pair of micro-tension control mechanisms 5 are respectively located on opposite sides of the diaphragm 9. A gap is left between the pair of tension rollers 502 for the diaphragm 9 to pass through.

[0034] Specifically, during the cell stacking process, the separator 9 delivered by the separator unwinding device needs to be switched back and forth between the positive and negative sides, such as... Figure 1 As shown, the diaphragm 9 needs to switch back and forth between positions A and B. During the switching process, the speed and tension of the diaphragm 9 change significantly. This embodiment of the invention, by setting a pair of micro-tension control mechanisms 5 and using a pair of tension rollers 502 to control the tension on both sides of the diaphragm 9 respectively, can effectively reduce the speed change of the diaphragm 9, reduce tension fluctuations, and significantly improve the stability and reliability of the diaphragm unwinding mechanism.

[0035] In addition, the precise control of tension through the diaphragm unwinding device can expand the applicability of the diaphragm 9, thereby reducing the manufacturing cost of the battery cell.

[0036] In one embodiment, such as Figure 1As shown, the buffer mechanism 4 is a multi-stage buffer mechanism, including multiple first sub-rollers 401 and multiple second sub-rollers 402. The multiple first sub-rollers 401 are spaced apart on a first side, and the multiple second sub-rollers 402 are spaced apart on a second side. The first side and the second side are arranged opposite to each other, for example, the first side is the upper side and the second side is the lower side, or the first side is the front side and the second side is the rear side. The diaphragm 9 is alternately threaded on the first sub-rollers 401 and the second sub-rollers 402. By setting multiple first sub-rollers 401 and multiple second sub-rollers 402, the buffer stroke can be effectively reduced, the corresponding acceleration can be reduced, thereby effectively reducing the external resistance encountered by the diaphragm 9 during operation and reducing the tension fluctuation of the diaphragm 9.

[0037] Furthermore, such as Figure 1 As shown, a reversing roller 10 is also provided between the buffer mechanism 4 and the micro-tension control mechanism 5. The reversing roller 10 is used to adjust the direction of the diaphragm 9 so that the diaphragm 9 enters the micro-tension control mechanism 5.

[0038] It should be noted that the present invention does not limit the number of the first sub-roller 401 and the second sub-roller 402, and two, three or more can be selected as needed.

[0039] For example, such as Figure 1 As shown, two first sub-rollers 401 and three second sub-rollers 402 are provided. The three second sub-rollers 402 are arranged collinearly, and the straight line formed by the two first sub-rollers 401 is parallel to the straight line formed by the three second sub-rollers 402. The diaphragm 9 alternately passes through the second sub-rollers 402 and the first sub-rollers 401.

[0040] In one embodiment, such as Figure 1 As shown, a main drive mechanism 7 is also provided between the tension roller mechanism 3 and the buffer mechanism 4. Before the diaphragm 9 leaves the tension roller mechanism 3 and enters the buffer mechanism 4, the tension fluctuation of the diaphragm 9 during unwinding is reduced by the main drive mechanism 7.

[0041] Furthermore, in one embodiment, such as Figure 1 As shown, the main drive mechanism 7 includes a main drive roller 701. Along a first direction, the main drive roller 701 is positioned between a plurality of first sub-rollers 401 and a plurality of second sub-rollers 402. Along a second direction, the main drive roller 701 is positioned between the tension swing roller mechanism 3 and the buffer mechanism 4. The main drive roller 701 can eliminate fluctuations in the diaphragm 9 from the unwinding mechanism 1 to the main drive roller 701, redistributing the tension from the main drive roller 701, thereby achieving precise control of the diaphragm 9 tension.

[0042] Specifically, the first direction is the conveying direction of the diaphragm 9 between the first sub-roller 401 and the second sub-roller 402, such as... Figure 1 As indicated by arrow X, the second direction is the conveying direction of the diaphragm 9 between the tension roller mechanism 3 and the buffer mechanism 4, as shown in the image. Figure 1 As indicated by the arrow Y in the diagram.

[0043] It should be noted that in this embodiment of the present invention, the main drive roller 701 and the unwinding mechanism 1 are used to drive the diaphragm 9 to move, and the remaining rollers are all driven rollers.

[0044] Furthermore, in one embodiment, such as Figure 1 As shown, the main drive mechanism 7 also includes a master-slave roller 702. The master-slave roller 702 is located on the side of the main drive roller 701 away from the micro-tension control mechanism 5, and a gap is left between it and the main drive roller 701 for the diaphragm 9 to pass through. By setting the master-slave roller 702, the tension of the diaphragm 9 entering the buffer mechanism 4 is stabilized, preventing wrinkles from forming on the diaphragm 9. In addition, after the diaphragm 9 passes through the gap between the main drive roller 701 and the master-slave roller 702, it enters the buffer mechanism 4, which reduces the friction between the diaphragm 9 and the main drive roller 701, thereby extending the service life of the main drive roller 701.

[0045] The working principle of this utility model embodiment is as follows:

[0046] The diaphragm 9 is mounted on the unwinding mechanism 1. The unwinding mechanism 1 drives the diaphragm 9 to the receiving platform 2 for roll changing and tape connection. After that, the diaphragm 9 enters the tension swing roller mechanism 3 to control the tension of the unwound diaphragm 9. The diaphragm 9 passes through the main drive roller 701 and then enters the buffer mechanism 4 for buffering, alternately passing through the first sub-roller 401 and the second sub-roller 402. Next, the diaphragm 9 enters the micro-tension control mechanism 5 through the reversing roller 10. The proportional valve 5012 of the micro-tension control mechanism 5 controls the extension and retraction of the telescopic component 5011, thereby driving the swing rod 503 to rotate around the fixed shaft 504, thereby controlling the tension roller 502 to loosen or tighten the diaphragm 9 and control the tension of the diaphragm 9. Finally, the diaphragm 9 enters the stacking table 8 after passing through the diaphragm correction mechanism 6.

[0047] To achieve the basic functions of the diaphragm unwinding device, the diaphragm unwinding device in this embodiment may also include other necessary modules or components, such as a frame and a control system. It should be noted that any suitable existing structure can be selected from the other necessary modules or components included in the diaphragm unwinding device. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of this utility model is not limited thereto.

[0048] According to an embodiment of the present invention, another aspect provides a stacking device, which mainly includes: a stacking table 8 and a diaphragm unwinding device. The stacking table 8 is located on the side of the diaphragm correction mechanism 6 away from the micro-tension control mechanism 5, and the diaphragm 9 enters the stacking table 8 through the diaphragm correction mechanism 6.

[0049] The stacking equipment provided in this embodiment of the utility model unwinds the diaphragm 9 through the unwinding mechanism 1 and provides the power for the movement of the diaphragm 9. Then the diaphragm 9 enters the receiving platform 2 for roll changing and tape connection. The tension swing roller mechanism 3 adjusts the tension of the diaphragm 9 in real time after receiving the receiving platform 2. The buffer mechanism 4 buffers the diaphragm 9 to effectively reduce the external resistance during the operation of the diaphragm 9. It compensates for the speed of the diaphragm 9 in the unwinding mechanism 1 and the speed at which it enters the stacking table 8. The drive component 501 drives the swing rod 503 to swing so that the tension roller 502 relaxes or tightens the diaphragm 9. It can accurately control the tension of the diaphragm 9, reduce the tension fluctuation of the diaphragm 9, thereby avoiding tearing of the diaphragm 9. The unwinding of the diaphragm 9 is stable and highly reliable.

[0050] Moreover, after the tension fluctuation of the diaphragm 9 is reduced, it can effectively reduce edge damage of the diaphragm 9 during the stacking process and reduce defects such as foreign objects puncturing the diaphragm 9.

[0051] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A diaphragm unwinding device, characterized in that, Along the moving direction of the diaphragm (9), the following are arranged in sequence: unwinding mechanism (1), receiving platform (2), tension swing roller mechanism (3), buffer mechanism (4), micro-tension control mechanism (5) and diaphragm correction mechanism (6); The micro-tension control mechanism (5) includes: Driver component (501); Tension roller (502) and swing arm (503), wherein the tension roller (502) is connected to the drive assembly (501) via the swing arm (503), and the drive assembly (501) is used to drive the swing arm (503) to swing so that the tension roller (502) relaxes or tensions the diaphragm (9).

2. The diaphragm unwinding device according to claim 1, characterized in that, The drive assembly (501) includes a telescopic member (5011) and a proportional valve (5012). The telescopic member (5011) is extended or retracted by the proportional valve (5012) to drive the swing arm (503) to swing.

3. The diaphragm unwinding device according to claim 2, characterized in that, The micro-tension control mechanism (5) further includes a fixed shaft (504), which is located on one side of the diaphragm (9). The swing rod (503) is rotatably mounted on the fixed shaft (504). One end of the swing rod (503) is rotatably connected to the telescopic member (5011), and the other end is provided with the tension roller (502).

4. The diaphragm unwinding device according to claim 3, characterized in that, The swing arm (503) is provided with a force roller (505) at one end near the telescopic member (5011), and the force roller (505) is hinged to the telescopic end of the telescopic member (5011).

5. The diaphragm unwinding device according to any one of claims 1 to 4, characterized in that, The micro-tension control mechanism (5) is provided in pairs, and the pair of micro-tension control mechanisms (5) are respectively located on opposite sides of the diaphragm (9). A gap is left between the pair of tension rollers (502) through which the diaphragm (9) passes.

6. The diaphragm unwinding device according to any one of claims 1 to 4, characterized in that, The buffer mechanism (4) is a multi-level buffer mechanism, including: multiple first sub-rollers (401) and multiple second sub-rollers (402), the multiple first sub-rollers (401) are spaced apart on a first side, the multiple second sub-rollers (402) are spaced apart on a second side, the first side and the second side are arranged opposite to each other, and the diaphragm (9) is alternately passed through the first sub-rollers (401) and the second sub-rollers (402).

7. The diaphragm unwinding device according to claim 6, characterized in that, A main drive mechanism (7) is also provided between the tension swing roller mechanism (3) and the buffer mechanism (4).

8. The diaphragm unwinding device according to claim 7, characterized in that, The main drive mechanism (7) includes a main drive roller (701). Along a first direction, the main drive roller (701) is disposed between a plurality of first sub-rollers (401) and a plurality of second sub-rollers (402). Along a second direction, the main drive roller (701) is disposed between the tension swing roller mechanism (3) and the buffer mechanism (4).

9. The diaphragm unwinding device according to claim 8, characterized in that, The main drive mechanism (7) also includes a main driven roller (702), which is located on the side of the main drive roller (701) away from the micro-tension control mechanism (5) and has a gap between it and the main drive roller (701) through which a diaphragm (9) passes.

10. A stacking device, characterized in that, include: Stacking table (8); According to any one of claims 1 to 9, the diaphragm unwinding device, the stacking table (8) is located on the side of the diaphragm correction mechanism (6) away from the micro-tension control mechanism (5), and the diaphragm (9) enters the stacking table (8) through the diaphragm correction mechanism (6).

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