Separator tensioning device, and winding apparatus

Abstract

A separator tensioning device (100), comprising a plurality of tension rollers sequentially arranged in the conveying direction of a separator (30). The plurality of tension rollers comprise: at least three first rollers (10a), wherein the most upstream and most downstream tension rollers among the plurality of tension rollers in the conveying direction are both the first rollers, a first rib (101) is formed on the circumferential surface of each first roller, and the first rib extends obliquely in the circumferential direction of the first roller in the axial direction from one end to the other end of the first roller; and second rollers (10b), wherein the circumferential surface of each second roller is a smooth surface. Further disclosed is a winding apparatus (1A) having a separator tensioning device. The first rollers can ensure the uniform tension of the separator throughout the whole process, thereby effectively reducing the probability of the generation of wrinkles; and the second rollers can reduce the probability of excessive adjustment or generation of additional wrinkles when the number of the first rollers is too large, and can also achieve a buffer effect and reduce the wear on the separator, thereby improving the winding efficiency of an electrode assembly by means of the winding apparatus and improving the quality of a finished product.

Description

Diaphragm tightening device and winding equipment Technical Field

[0001] This application relates to a diaphragm tightening device and a winding device. Background Technology

[0002] Against the backdrop of the booming development of new energy fields such as lithium batteries, the separator, as a key component of the battery cell, plays a crucial role in the performance of the battery cell. With continuous technological innovation, in order to meet the higher energy density requirements of battery devices and improve charging and discharging efficiency, separators are developing towards thinner and lighter designs, with their thickness becoming smaller and smaller.

[0003] However, the diaphragm winding process faces severe challenges in actual production. Specifically, during the winding process, the tension control system of the winding equipment struggles to achieve ideal uniformity, resulting in uneven tension on the diaphragm. Furthermore, due to the diaphragm's extremely thin thickness and inherent physical properties, it exhibits very low rigidity and extremely high flexibility, making it highly susceptible to stress imbalance under uneven tension. Even slight tension differences can cause localized deformation of the diaphragm, leading to wrinkles. The thinner the diaphragm, the higher the probability of wrinkles caused by external force imbalance, and the more severe the wrinkles become. This significantly impacts the quality of the wound electrode assembly, affecting the performance and safety of the entire battery cell.

[0004] Application content

[0005] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a diaphragm tightening device and a winding device including the diaphragm tightening device. The diaphragm tightening device can effectively reduce the probability of wrinkle formation and improve the stability and surface quality of the diaphragm during the conveying process.

[0006] In a first aspect, embodiments of this application provide a diaphragm tightening device, including a plurality of tension rollers arranged sequentially along the conveying direction of the diaphragm. The plurality of tension rollers include: a first roller, the number of which is at least three, wherein the tension rollers located at the upstream and downstream ends in the conveying direction are both formed as first rollers, a first rib is formed on the circumferential surface of the first roller, and the first rib extends obliquely along the circumferential direction of the first roller in the direction from one end to the other end in the axial direction of the first roller; and a second roller, the circumferential surface of which is a smooth surface.

[0007] In the above technical solution, since the multiple tension rollers include at least three first rollers and second rollers, two of the multiple first rollers are respectively arranged at the upstream and downstream ends of the multiple tension rollers. A first rib is formed on the first roller, and the first rib extends obliquely along the circumference of the first roller in the direction from one end of the axial direction to the other end. In this way, the first roller can apply a first force to the diaphragm in the direction of at least one end of the axial direction through the first rib. Thus, the upstream first roller can adjust the initial tension of the diaphragm through the first rib and correct the deviation during feeding. The first roller in the middle position can correct the uneven tension during conveying in real time through the first rib and stabilize the conveying process of the diaphragm. The downstream first roller can make the diaphragm leave with uniform tension through the first rib. Therefore, the uniform tension of the diaphragm can be guaranteed throughout the process, effectively reducing the probability of wrinkle formation and improving the quality of the diaphragm and production efficiency. At the same time, a smooth second roller is also provided among the multiple tension rollers. The second roller can reduce the probability of over-adjustment or additional wrinkles when there are too many first rollers. It can also play a buffering role and reduce wear on the diaphragm. Thus, the diaphragm tightening device can effectively adjust the tension and reduce wrinkles while improving the stability and surface quality of the diaphragm during the conveying process.

[0008] In some embodiments, the ratio of the number of first rollers to the total number of tension rollers is greater than or equal to 30% and less than or equal to 50%.

[0009] In the above technical solution, by setting the ratio of the number of first rollers to the total number of tension rollers to be between 30% and 50%, the diaphragm tightening device not only has a sufficient number of first rollers to fully adjust the tension of the diaphragm and reduce the probability of wrinkles on the diaphragm, but also has an appropriate number of second rollers to reduce the probability of over-adjustment caused by too many first rollers and to reduce the probability of additional wrinkles. This allows the diaphragm to be transported smoothly between multiple tension rollers, reducing friction and surface damage to the diaphragm, improving the overall quality and efficiency of diaphragm transport, and ensuring the flatness of the diaphragm. Thus, it not only effectively adjusts the diaphragm tension but also ensures stable diaphragm transmission.

[0010] In some embodiments, the total number of tension rollers is N, and at least one first roller is disposed between the m-th tension roller and the n-th tension roller along the conveying direction, wherein m is the largest positive integer less than or equal to N / 3, and n is the smallest positive integer greater than or equal to 2N / 3.

[0011] In the above technical solution, by setting at least one first roller between the m-th tension roller and the n-th tension roller, on the one hand, the tension of the diaphragm in the middle section along the conveying direction can be effectively adjusted by the first roller located in the middle section, adjusting the uneven tension accumulated in the front section of the conveying direction, pulling and smoothing the wrinkles generated in the front section of the diaphragm in the conveying direction, and reducing the probability of further development of wrinkles on the diaphragm; on the other hand, multiple first rollers can be arranged relatively evenly along the conveying direction, reducing the situation of diaphragm tension loss of control and wrinkle aggravation due to the lack of reasonable tension adjustment points in the middle section along the conveying direction, so that the diaphragm can have a more stable tension state throughout the entire conveying process, thereby improving the diaphragm quality. In some embodiments, two or three of the multiple first rollers are arranged continuously along the conveying direction.

[0012] In some embodiments, two or three of the plurality of first rollers are arranged continuously along the conveying direction.

[0013] In the above technical solution, two or three of the multiple first rollers are arranged continuously along the conveying direction, which can improve the adjustment efficiency of diaphragm tension, realize the rapid elimination of uneven tension, and further reduce the possibility of wrinkles on the diaphragm.

[0014] In some embodiments, the total number of tension rollers is N. Along the conveying direction of the diaphragm, the (N-1)th tension roller and the Nth tension roller are both first rollers, and the (N-2)th tension roller is a second roller.

[0015] In the above technical solution, by making both the (N-1)th tension roller and the Nth tension roller the first roller, the tension of the diaphragm can be controlled more precisely and efficiently at the end of the conveying process, thereby improving the uniformity of the diaphragm tension, further reducing wrinkles, and improving the output quality of the diaphragm. Making the (N-2)th tension roller the second roller allows the diaphragm to transition smoothly, reducing the probability of tension disturbances and new wrinkles caused by continuous adjustments at the end, and effectively optimizing the entire diaphragm conveying process.

[0016] In some embodiments, along the conveying direction, one or more second rollers are provided between at least a set of two adjacent first rollers.

[0017] In the above technical solution, by providing one or more second rollers between at least one set of two adjacent first rollers, the one or more second rollers between the two first rollers can play a buffering role on the diaphragm, so that the tension fluctuation of the diaphragm is controlled within a small range, and the tension adjustment of the diaphragm is smoother and more continuous. At the same time, by providing one or more second rollers, friction can be reduced and wear on the diaphragm can be reduced.

[0018] In some embodiments, along the conveying direction, the number of second rollers between any two adjacent first rollers is greater than or equal to 1 and less than or equal to 4.

[0019] In the above technical solution, the number of second rollers between any two adjacent first rollers is greater than or equal to 1 and less than or equal to 4. This can effectively realize the transition and buffer between the tension adjustment of the two adjacent first rollers, improve the output quality of the diaphragm, reduce the number of second rollers, reduce the number of parts of the diaphragm winding device, reduce the space occupied, and reduce costs.

[0020] In some embodiments, in the direction from one end of the first roller to the other end in the axial direction of the first roller, the first ribs on the plurality of first rollers extend in the same direction in the circumferential direction of the first roller.

[0021] In the above technical solution, by making the first ribs on the multiple first rollers extend in the same direction in the circumferential direction of the first rollers, when the rotation directions of the two first rollers are the same, the two first rollers can pull the diaphragm in the same axial direction one after another, so as to improve the flattening efficiency of the diaphragm and reduce the probability of wrinkling. By making the rotation directions of the two first rollers opposite, the two first rollers can pull the diaphragm in both axial directions one after another, which can not only further reduce the probability of wrinkling of the diaphragm, but also reduce the probability of the diaphragm shifting due to continuous pulling by the first force in the same direction.

[0022] In some embodiments, the diaphragm tightening device is configured to deliver a diaphragm with a thickness greater than or equal to 5 μm and less than or equal to 10 μm.

[0023] In the above technical solution, the diaphragm tightening device is configured to transport diaphragms with a thickness greater than or equal to 5μ and less than or equal to 10μ, so as to meet the requirements of diaphragm flatness and integrity during the transport process for diaphragms with a thickness less than 10μ.

[0024] In some embodiments, the diaphragm tightening device is configured to deliver a diaphragm with a thickness greater than or equal to 5 μm and less than or equal to 8 μm.

[0025] In the above technical solution, the diaphragm tightening device is configured to transport a diaphragm with a thickness of 5μ-8μ, thereby ensuring the flatness and integrity of the diaphragm with a thickness of 5μ-8μ during the transport process.

[0026] In some embodiments, the first rib extends spirally in a direction from one axial end of the first roller toward the other.

[0027] In the above technical solution, the first rib extends spirally in the axial direction of the first roller, which can make the first force applied by the first rib to the diaphragm more uniform, reduce the probability of wrinkles due to uneven force, enhance the gripping force of the first roller on the diaphragm, reduce the probability of diaphragm slipping or shifting, and improve the stability of the diaphragm during the conveying process.

[0028] In some embodiments, the number of first ribs on at least one first roller is one, and the pitch of the first rib spiral extension is greater than or equal to 5 mm and less than or equal to 50 mm.

[0029] In the above technical solution, a first rib is provided on the first roller, and the pitch of the spiral extension of the first rib is greater than or equal to 5 mm and less than or equal to 50 mm. This can make the force of the first rib on the diaphragm more evenly and densely distributed in the axial direction, thereby reducing the uneven local tension of the diaphragm caused by excessive force interval, and thus reducing the probability of wrinkles.

[0030] In some embodiments, the pitch of the first helical extension is greater than or equal to 10 mm and less than or equal to 20 mm.

[0031] In the above technical solution, a first rib is provided on the first roller, and the pitch of the spiral extension of the first rib is 10mm-20mm. This can make the force of the first rib on the diaphragm more evenly and densely distributed in the axial direction, thereby further reducing the uneven local tension on the diaphragm and further reducing the probability of wrinkles.

[0032] In some embodiments, the number of first ribs on at least one first roller is multiple, and the multiple first ribs on the first roller extend in the same spiral direction.

[0033] In the above technical solution, by setting the spiral extension direction of multiple first ribs on the first roller to be the same, multiple first ribs can apply axial first force from multiple positions in the same pattern, making the force on the diaphragm more uniform, further reducing wrinkles caused by uneven local force, and also enhancing the ability to adjust the tension of the diaphragm, increasing the contact area with the diaphragm, improving the gripping force on the diaphragm, and ensuring the stability of the diaphragm during the conveying process.

[0034] In some embodiments, the distance between two adjacent first ribs in the axial direction of the first roller is greater than or equal to 5 mm and less than or equal to 50 mm.

[0035] In the above technical solution, the spacing d2 between adjacent first ribs satisfies: 5mm≤d2≤50mm, which can enhance the overall gripping force on the diaphragm, reduce the probability of the diaphragm slipping during transport, and allow for timely fine-tuning for tension changes at different positions, further improving the stability and flatness of diaphragm transport.

[0036] In some embodiments, the distance between two adjacent first ribs in the axial direction of the first roller is greater than or equal to 10 mm and less than or equal to 20 mm.

[0037] In the above technical solution, the spacing d2 between adjacent first ribs is 10mm-20mm, which can further enhance the overall gripping force on the diaphragm, further reduce the probability of diaphragm slippage, and also make more timely fine adjustments to the tension changes at different positions of the diaphragm, thereby improving the stability and flatness of the diaphragm conveying.

[0038] In some embodiments, the first roller includes a first segment and a second segment connected in the axial direction, and the first roller has a plurality of first ribs, which are respectively formed on the first segment and the second segment. In the axial direction of the first roller, the first ribs on the first segment and the first ribs on the second segment both extend spirally along the circumferential direction of the first roller, and the spiral extension directions of the first ribs on the first segment and the first ribs on the second segment are opposite.

[0039] In the above technical solution, the first roller includes a first section and a second section connected in the axial direction. The spiral extension direction of the first rib on the first section is opposite to that of the first rib on the second section. This allows the direction of the first force of the first rib on the first section to be opposite to the direction of the first force of the first rib on the second section. This reduces the probability of the diaphragm shifting due to unilateral force, ensuring that the diaphragm is always conveyed along the correct path. It also balances the tension of the diaphragm in the axial direction of the first roller, counteracting the uneven tension caused by local stretching or friction, reducing the probability of wrinkles caused by tension differences, and improving the flatness of the diaphragm during the conveying process.

[0040] In some embodiments, the first rib on the first segment and the first rib on the second segment are arranged symmetrically about the vertical plane of the first line segment, wherein the first line segment is parallel to the central axis of the first roller, and in the axial direction of the first roller, one end of the first line segment is flush with the end of the first rib on the first segment away from the second segment, and the other end of the first line segment is flush with the end of the first rib on the second segment away from the first segment.

[0041] In the above technical solution, the first rib on the first segment and the first rib on the second segment are arranged symmetrically, so that the magnitude of the first force of the first rib on the first segment and the first force of the first rib on the second segment are approximately equal and opposite in direction. As a result, the forces on both sides of the diaphragm in the width direction are balanced, reducing the probability of wrinkles caused by tension differences and improving the flatness of the diaphragm during the conveying process.

[0042] In some embodiments, the first rib on the first segment is connected to the first rib on the second segment.

[0043] In the above technical solution, the first rib on the first section is connected to the first rib on the second section, which can enhance the continuity of the force on the diaphragm, so that the force on the diaphragm at the connection between the first and second sections can be smoothly transitioned, reducing the probability of wrinkles or displacement caused by sudden changes in force. At the same time, it can also enhance the gripping force of the first roller on the diaphragm, reduce the probability of diaphragm slippage, ensure that the diaphragm is subjected to uniform force during conveying, and improve the stability of tension adjustment.

[0044] In some embodiments, the angle between the first rib and the central axis of the first roller is greater than or equal to 50° and less than or equal to 80°.

[0045] In the above technical solution, the angle between the first rib and the central axis of the first roller is 50°-80°. This allows the force generated by the first rib to effectively regulate the tension of the diaphragm in the width direction, avoiding wrinkles or deviations caused by uneven tension. It also provides sufficient friction to ensure that the diaphragm rotates stably with the first roller, reducing the probability of diaphragm slippage. Furthermore, it facilitates stable, efficient, and low-damage conveying of the diaphragm.

[0046] In some embodiments, the ratio of the length of the first rib in the axial direction of the first roller to the length of the first roller is greater than or equal to 0.5 and less than or equal to 1.

[0047] In the above technical solution, the ratio of the length of the first rib in the axial direction of the first roller to the length of the first roller is greater than or equal to 0.5 and less than or equal to 1. This ensures that the first rib has sufficient length in the axial direction of the first roller, thereby allowing the first rib to apply a more uniform axial force to the diaphragm. This reduces the probability of uneven tension caused by the lack of local force, lowers the risk of diaphragm wrinkles and twisting, and improves the flatness of the diaphragm conveying. At the same time, a sufficiently long first rib can increase the contact area between the first rib and the diaphragm, improve the gripping force, make the diaphragm more stable during conveying, less prone to slippage or deviation, and improve conveying accuracy.

[0048] In some embodiments, the first rib is a raised rib formed on the circumferential surface of the first roller and protruding radially outward.

[0049] In the above technical solution, the first rib is a raised rib formed on the circumferential surface of the first roller and protruding outward in the radial direction. It can improve the structural strength of the first roller, and the processing technology is relatively simple, which can shorten the production cycle and reduce costs.

[0050] In some embodiments, the surface of the first roller is formed with recessed grooves that extend obliquely toward the circumference of the first roller in a direction from one end of the first roller to the other in the axial direction. The number of grooves is one, and a first rib is formed between two adjacent groove segments in the axial direction. Alternatively, the number of grooves is multiple, and a first rib is formed between two adjacent grooves in the axial direction.

[0051] In the above technical solution, by processing grooves on the surface of the first roller to form the first rib, the heat dissipation effect and chip removal performance of the first roller can be improved, thereby enhancing the conveying quality of the diaphragm, while achieving precise tension adjustment.

[0052] In some embodiments, the height of the first rib in the radial direction of the first roller is greater than or equal to 1 mm and less than or equal to 10 mm.

[0053] In the above technical solution, the height of the first rib is greater than or equal to 1 mm and less than or equal to 10 mm. The first rib can provide sufficient friction and holding force to the diaphragm to ensure stable diaphragm transport, while reducing the risk of excessive compression or damage to the diaphragm and lowering the probability of indentations and damage on the diaphragm surface.

[0054] In some embodiments, the height of the first rib in the radial direction of the first roller is greater than or equal to 3 mm and less than or equal to 6 mm.

[0055] In the above technical solution, the height of the first rib is greater than or equal to 3mm and less than or equal to 6mm. This not only provides appropriate friction for the diaphragm, allowing it to stably follow the first roller during transport and reducing the probability of diaphragm slippage, but also enables effective adjustment of diaphragm tension, reducing the probability of wrinkles caused by uneven tension. Furthermore, it reduces the probability of excessive pressure on the diaphragm due to an excessively high first rib, thus lowering the risk of diaphragm damage. In addition, a first rib height of 3mm-6mm also improves the stability of the first roller during rotation, reducing the risk of rotational imbalance caused by an excessively high first rib.

[0056] In some embodiments, the thickness of the first rib is greater than or equal to 1 mm and less than or equal to 10 mm in the direction perpendicular to the extension direction of the first rib.

[0057] In the above technical solution, the thickness of the first rib is greater than or equal to 1 mm and less than or equal to 10 mm, which can make the thickness of the first rib moderate. This not only reduces the risk of excessive local pressure on the diaphragm and the probability of indentation or damage to the diaphragm, ensuring the smoothness of the diaphragm surface, but also improves the rotational balance performance of the first roller, improves the conveying accuracy of the diaphragm, and reduces vibration and noise.

[0058] In some embodiments, the thickness of the first rib is greater than or equal to 3 mm and less than or equal to 6 mm in the direction perpendicular to the extension direction of the first rib.

[0059] In the above technical solution, the thickness of the first rib is greater than or equal to 3mm and less than or equal to 6mm. This not only provides sufficient support and friction for the diaphragm, improving the stability of diaphragm conveying and reducing the probability of diaphragm slippage, but also reduces the risk of excessive compression of the diaphragm and the probability of diaphragm damage due to compression. In addition, it helps maintain the rotational balance of the first roller, reduces vibration, ensures stable equipment operation, and improves the accuracy and quality of diaphragm conveying.

[0060] Secondly, embodiments of this application provide a winding apparatus for winding an electrode assembly, the electrode assembly including an electrode sheet and a diaphragm, the winding apparatus including a diaphragm tightening device according to the first aspect of this application, the diaphragm tightening device being used to transport the diaphragm.

[0061] In the above-described technical method, since the winding equipment is equipped with the aforementioned diaphragm tightening device, and since the diaphragm tightening device is used to transport the diaphragm of the electrode assembly, the plurality of tension rollers of the diaphragm tightening device includes at least three first rollers and second rollers. Two of the plurality of first rollers are respectively arranged at the upstream and downstream ends of the plurality of tension rollers. A first rib is formed on the first roller, and the first rib extends obliquely along the circumference of the first roller in the direction from one end of the axial direction to the other end. In this way, the first roller can apply a first force toward at least one end of the axial direction to the diaphragm through the first rib. Thus, the upstream first roller can adjust the initial tension of the diaphragm through the first rib and correct the deviation during feeding. The first roller in the middle position can... The first rib corrects uneven tension during conveying, stabilizing the diaphragm conveying process. The downstream first roller can use the first rib to make the diaphragm leave with uniform tension. This ensures uniform diaphragm tension throughout the process, effectively reducing the probability of wrinkles and improving diaphragm quality and production efficiency. At the same time, a smooth second roller is also set among the multiple tension rollers. The second roller can reduce the probability of over-adjustment or additional wrinkles when there are too many first rollers. It can also play a buffering role and reduce wear on the diaphragm. Thus, the diaphragm tightening device can effectively adjust tension and reduce wrinkles while improving the stability and surface quality of the diaphragm during conveying. This, in turn, improves the winding efficiency of the winding equipment for electrode components and the quality of the finished product.

[0062] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0063] Figure 1 is a schematic diagram of the structure of a diaphragm tightening device according to some embodiments of this application;

[0064] Figure 2 is a structural schematic diagram of a diaphragm tightening device according to some other embodiments of the present application;

[0065] Figure 3 is a schematic diagram of the structure of a first roller according to some embodiments of the present application, wherein the first roller is provided with a spirally extending first rib;

[0066] Figure 4 is a structural schematic diagram of a first roller according to some other embodiments of the present application, wherein the first roller is provided with a plurality of spirally extending first ribs in the same direction;

[0067] Figure 5 is a structural schematic diagram of the first roller according to some embodiments of this application;

[0068] Figure 6 is a cross-sectional view of a first roller according to some embodiments of the present application;

[0069] Figure 7 is an enlarged view of point A circled in Figure 6;

[0070] Figure 8 is a schematic diagram of the structure of the first roller shown in Figure 6;

[0071] Figure 9 is a schematic diagram of the structure of the second roller according to an embodiment of this application;

[0072] Figure 10 is a partial structural schematic diagram of a winding device according to an embodiment of this application;

[0073] Figure 11 is a partial enlarged view of the winding device shown in Figure 10;

[0074] Figure 12 is a schematic diagram of an electrode assembly wound using a winding device according to an embodiment of this application.

[0075] Reference numerals: 1A, winding equipment; 100, diaphragm tightening device; 10a, first roller; 101, first rib; 102, first section; 103, second section; 10b, second roller; 30, diaphragm; 300, electrode assembly; 31, positive electrode sheet; 32, negative electrode sheet; 30a, upper diaphragm; 30b, lower diaphragm. Detailed Implementation

[0076] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0079] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0080] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0082] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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 or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0084] The electrode assembly mentioned in the embodiments of this application is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0085] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0086] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0087] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0088] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0089] Against the backdrop of the booming development of new energy fields such as lithium batteries, the separator, as a key component of battery devices, plays a crucial role in the performance of these devices. With continuous technological innovation, in order to meet the higher energy density requirements of battery devices and improve charging and discharging efficiency, separators are developing towards being lighter and thinner.

[0090] However, the diaphragm winding process faces severe challenges in actual production. On the one hand, the tension control system of the winding equipment is difficult to achieve ideal uniformity. Even slight differences in the mechanical structure and transmission components of various parts of the equipment during operation can lead to uneven tension. On the other hand, the thinner the diaphragm, the lower its rigidity and the higher its flexibility due to its physical properties, making it extremely susceptible to stress imbalance under uneven tension. Even slight tension differences can cause localized deformation of the diaphragm, leading to wrinkles. The thinner the diaphragm, the more exponentially the probability of wrinkles caused by external force imbalance increases, severely affecting diaphragm quality and consequently the performance and safety of the entire battery device.

[0091] Based on the above considerations, in order to reduce the probability of wrinkles occurring in the diaphragm during winding, this application designs a diaphragm tightening device. The diaphragm tightening device includes multiple tension rollers, each comprising at least three first rollers and second rollers. A first rib is formed on the first roller, extending obliquely circumferentially from one end towards the other in the axial direction of the first roller. Two of the first rollers are respectively arranged at the uppermost and lowermost points of the tension rollers. The second roller is a smooth roller. Thus, the uppermost first roller can adjust the initial tension of the diaphragm and correct deviations during feeding, while the first roller in the middle position can... The device corrects uneven tension during conveying in real time, stabilizing the diaphragm conveying process. The first roller at the downstream end ensures that the diaphragm leaves with uniform tension, thus guaranteeing uniform diaphragm tension throughout the process. This effectively reduces the probability of wrinkles and improves diaphragm quality and production efficiency. At the same time, a smooth second roller is also provided among the multiple tension rollers. The second roller reduces the number of first rollers, reducing over-adjustment or additional wrinkles caused by an excessive number of first rollers. It also acts as a buffer and reduces wear on the diaphragm. Thus, the diaphragm tightening device effectively adjusts tension and reduces wrinkles while improving the stability and surface quality of the diaphragm during conveying.

[0092] The diaphragm tightening device 100 according to an embodiment of the first aspect of this application is described below with reference to Figures 1-12.

[0093] Figure 1 is a structural schematic diagram of a diaphragm tightening device 100 according to some embodiments of the present application; Figure 2 is a structural schematic diagram of a diaphragm tightening device 100 according to other embodiments of the present application; Figure 3 is a structural schematic diagram of a first roller 10a according to some embodiments of the present application, wherein the first roller 10a is provided with a spirally extending first rib 101; Figure 4 is a structural schematic diagram of a first roller 10a according to other embodiments of the present application, wherein the first roller 10a is provided with a plurality of spirally extending first ribs 101 in the same direction; Figure 5 is a structural schematic diagram of a first roller 10a according to yet another embodiment of the present application. Figure 6 shows a cross-sectional view of the first roller 10a according to some embodiments of the present application; Figure 7 is an enlarged view of point A circled in Figure 6; Figure 8 is a structural schematic diagram of the first roller 10a shown in Figure 6.

[0094] Figure 9 is a structural schematic diagram of the second roller 10b according to an embodiment of the present application; Figure 10 is a partial structural schematic diagram of the winding device 1A according to an embodiment of the present application; Figure 11 is a partial enlarged view of the winding device shown in Figure 10; Figure 12 is a schematic diagram of the electrode assembly 300 wound using the winding device 1A according to an embodiment of the present application.

[0095] This application provides a diaphragm tightening device 100, as shown in Figures 1 and 2, which includes multiple tension rollers arranged sequentially along the conveying direction of the diaphragm 30 (e.g., the direction indicated by the hollow arrow in Figure 1). The multiple tension rollers include: a first roller 10a and a second roller 10b. The number of first rollers 10a is at least three. The tension rollers located at the upstream and downstream ends in the conveying direction are both formed as first rollers 10a. A first rib 101 is formed on the circumferential surface of the first roller 10a. In the axial direction of the first roller 10a, the first rib 101 extends obliquely along the circumferential direction of the first roller 10a. The circumferential surface of the second roller 10b is a smooth surface.

[0096] The tension roller is used to control the tension of the diaphragm 30 during its conveying process. Specifically, the tension roller can apply a certain pulling force or resistance to the diaphragm 30 to adjust its tension. When the diaphragm 30 passes through the tension roller, the speed or position of the tension roller can be adjusted by means of a motor, cylinder, or other device connected to the tension roller, thereby changing the magnitude of the pulling force on the diaphragm 30. This can improve the flatness of the diaphragm 30 during processing (such as winding) and reduce the probability of quality problems such as wrinkles caused by uneven tension.

[0097] As shown in Figures 1 and 2, in some examples, a portion of the multiple tension rollers is formed as a first roller 10a, and another portion is formed as a second roller 10b. The number of first rollers 10a can be three, four, five, six, eight, ten, or more, etc. The number of tension rollers is set to N, where N is a positive integer greater than 3, and the multiple tension rollers are arranged sequentially along the conveying direction of the diaphragm 30. Specifically, along the conveying direction, the first and Nth tension rollers are both first rollers 10a, and the remaining first rollers 10a are positioned between the first and Nth tension rollers.

[0098] As shown in Figures 1, 3, and 4, in some examples, the first roller 10a is a non-smooth roller, and first ribs 101 are formed on the circumferential surface of the first roller 10a. There can be one or more first ribs 101. When there are multiple first ribs 101, they can be arranged circumferentially and / or axially along the first roller 10a. For any given first rib 101, it extends along the axial direction of the first roller 10a (e.g., the X direction in Figures 3 and 4), and in the direction from one end of the first roller 10a axially towards the other end, the first rib 101 extends obliquely towards one side of the circumferential direction of the first roller 10a. Thus, during the rotation of the first roller 10a, the first rib 101 can apply a first force along the axial direction of the first roller 10a towards one axial end of the first roller 10a to the diaphragm 30 tensioned on the first roller 10a, allowing the first roller 10a to flatten the diaphragm 30.

[0099] Specifically, when the first roller 10a rotates around its own axis to transport the diaphragm 30, the first rib 101 can apply a first force toward one end of the first roller 10a in the axial direction to the diaphragm. At this time, the first force of one or more first ribs 101 can pull the diaphragm 30 toward one or both ends of the first roller 10a in the axial direction to flatten the diaphragm 30 and reduce the probability of the diaphragm 30 wrinkling.

[0100] In this embodiment, the first tension roller, the Nth tension roller, and at least one tension roller located between the first tension roller and the Nth tension roller along the conveying direction are configured as a first roller 10a having a first rib 101.

[0101] It should be noted that when the diaphragm 30 first enters the diaphragm tightening device 100, its initial tension may be uneven due to factors such as the previous process or the feeding method. Therefore, the upstream tension roller is set as a first roller 10a with a first rib 101. During rotation, the first rib 101 on the circumference of the upstream first roller 10a can apply a first force along one end of the axial direction to the diaphragm 30, thereby pulling the diaphragm 30 toward one or both ends of the axial direction of the first roller 10a. This can effectively correct the initial tension deviation of the diaphragm 30 when it enters the diaphragm tightening device 100, accurately adjust the initial tension, and reduce the probability of wrinkles caused by uneven initial tension.

[0102] When the diaphragm 30 is conveyed between multiple tension rollers located between the first and Nth tension rollers, the tension of the diaphragm 30 may still become uneven due to the increase in conveying distance and other potential factors (such as slight equipment vibration, small speed differences between different tension rollers, etc.). Therefore, at least one tension roller located between the first and Nth tension rollers is set as a first roller 10a with a first rib 101. The first roller 10a in the middle can pull the diaphragm 30 through the first force of the first rib 101, thereby readjusting the tension of the diaphragm 30. Specifically, wrinkles or tension deviations generated during conveying between multiple tension rollers between two adjacent first rollers 10a can be corrected in time by the middle first roller 10a, so that the tension of the diaphragm 30 remains in a relatively stable state throughout the conveying process, effectively reducing the probability of wrinkles forming in the diaphragm 30 during the intermediate conveying stage.

[0103] Since the final state of the diaphragm 30 after conveying has a significant impact on its subsequent processing, setting the downstream tension roller as the first roller 10a allows for final tension adjustment of the diaphragm 30. Specifically, the pulling force of the first rib 101 on the downstream first roller 10a ensures that the diaphragm 30 leaves the conveying device with a uniform tension. Even if the diaphragm 30 experiences minor tension changes or potential wrinkling during the preceding conveying process, the downstream first roller 10a can eliminate these defects by pulling the diaphragm, ensuring that the diaphragm 30 reaches its optimal state upon output, allowing it to enter the next process (e.g., the winding process) in a smooth and wrinkle-free condition.

[0104] In short, the upstream first roller 10a adjusts the initial tension of the diaphragm 30, corrects deviations during feeding, and reduces the probability of wrinkles in the diaphragm 30 from the source. The middle first roller 10a corrects uneven tension during conveying in real time, compensates for or releases local tension, and stabilizes the conveying process of the diaphragm 30. The downstream first roller 10a ensures that the diaphragm 30 leaves with uniform tension, eliminating minor defects. Therefore, uniform tension of the diaphragm 30 can be guaranteed throughout the entire process, effectively reducing the probability of wrinkles and improving the quality and production efficiency of the diaphragm 30.

[0105] As shown in Figures 1 and 5, in some examples, the circumferential surface of the second roller 10b is a smooth surface; that is, the second roller 10b is a smooth roller, which is a roller with a flat and smooth surface. The surface of the smooth roller is finely processed and has a very low roughness. During the conveying of the diaphragm 30, the smooth roller can reduce friction on the surface of the diaphragm 30, avoid scratching the diaphragm, and guide the diaphragm 30 to be conveyed stably, reducing the probability of the diaphragm 30 developing wrinkles, wear, or other surface damage due to the rough surface of the roller during the conveying process.

[0106] In this embodiment, a portion of the multiple tension rollers is formed as a first roller 10a with a first rib 101, and another portion is formed as a second roller 10b with a smooth surface. Thus, when the diaphragm 30 is conveyed by the multiple tension rollers, the first rib 101 on the circumferential surface of the first roller 10a can apply an axial pulling force to the diaphragm 30, thereby adjusting the tension of the diaphragm 30 and reducing the probability of wrinkles in the diaphragm 30. The smooth surface of the second roller 10b ensures a smooth transition of the diaphragm 30 during the conveying process.

[0107] It should be noted that if all tension rollers in the diaphragm tightening device 100 are first rollers 10a, the diaphragm 30 may become over-adjusted due to the frequent force exerted by the first rib 101, and these forces may even combine to create new tension unevenness. In this embodiment, a portion of the tension rollers is formed as a second roller 10b with a smooth surface. The second roller 10b allows the diaphragm 30 to have a relatively stable conveying process after tension adjustment by the first roller 10a, thus buffering the conveying and tension adjustment of the diaphragm 30 and reducing the probability of additional wrinkles caused by over-adjustment. Simultaneously, the smooth second roller 10b reduces wear on the surface of the diaphragm 30, ensuring the flatness of the diaphragm 30 and further reducing the probability of wrinkles.

[0108] In the above technical solution, since the multiple tension rollers include at least three first rollers 10a and second rollers 10b, two of the first rollers 10a are respectively arranged at the uppermost and lowermost ends of the multiple tension rollers, the second roller 10b is a smooth roller, and a first rib 101 is formed on the first roller 10a. The first rib 101 extends obliquely along the circumference of the first roller 10a in the direction from one end of the axial direction to the other end. In this way, the first roller 10a can apply a first force toward at least one end of the axial direction to the diaphragm through the first rib 101. Thus, the uppermost first roller 10a can adjust the initial tension of the diaphragm 30 through the first rib 101 to correct the deviation during feeding, and the first roller 10a in the middle position can... The first rib 101 corrects uneven tension during conveying in real time, stabilizing the conveying process of the diaphragm 30. The downstream first roller 10a can make the diaphragm 30 leave with uniform tension through the first rib 101. Thus, the tension of the diaphragm 30 can be kept uniform throughout the process, effectively reducing the probability of wrinkles and improving the quality and production efficiency of the diaphragm 30. At the same time, a smooth second roller 10b is also provided among the multiple tension rollers. The second roller 10b can reduce the probability of over-adjustment or additional wrinkles when there are too many first rollers 10a. It can also play a buffering role and reduce wear on the diaphragm 30. Thus, the diaphragm tightening device 100 can effectively adjust the tension and reduce wrinkles while improving the stability and surface quality of the diaphragm 30 during the conveying process.

[0109] In some embodiments of this application, as shown in Figures 1 and 2, the ratio of the number of first rollers 10a to the total number of tension rollers is greater than or equal to 30% and less than or equal to 50%.

[0110] In other words, the total number of tension rollers in the diaphragm 30 winding device is N, the number of the first roller 10a is 0.3N-0.5N, and the number of the second roller 10b is 0.5N-0.7N.

[0111] For example, the ratio of the number of first rollers 10a to the total number of tension rollers can be 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%, etc.

[0112] In some specific examples, when the total number N of the tension rollers of the diaphragm 30 winding device is equal to 18, the number of first rollers 10a can be six, seven, eight or nine, and the remaining tension rollers are all smooth second rollers 10b.

[0113] In some other specific examples, when the total number N of the tension rollers of the diaphragm 30 winding device is equal to 16, the number of first rollers 10a can be five, six, seven or eight, and the remaining tension rollers are all smooth second rollers 10b.

[0114] It should be noted that when the number of first rollers 10a is excessive, for example, exceeding half the total number of tension rollers, during the conveying of the diaphragm 30, the diaphragm 30 will be frequently subjected to the initial force of the first rib 101, causing the diaphragm 30 to shift or generate additional wrinkles due to over-adjustment. It will also increase the friction between the diaphragm 30 and the first rollers 10a, increasing wear on the diaphragm 30 and affecting its quality. Conversely, during long-distance conveying of the diaphragm 30, if the number of first rollers 10a is insufficient, the tension adjustment of the diaphragm 30 will be inadequate, making it difficult to ensure uniform tension throughout the process and effectively reducing wrinkles in the diaphragm 30.

[0115] In the above technical solution, by setting the ratio of the number of first rollers 10a to the total number of tension rollers to be between 30% and 50%, the diaphragm tightening device 100 not only has a sufficient number of first rollers 10a to fully adjust the tension of the diaphragm 30 and reduce the probability of wrinkles on the diaphragm 30, but also has an appropriate number of second rollers 10b to reduce the probability of over-adjustment caused by too many first rollers 10a and to reduce the probability of additional wrinkles. This allows the diaphragm 30 to be smoothly conveyed among multiple tension rollers, reducing friction and surface damage to the diaphragm 30, improving the overall quality and efficiency of diaphragm 30 conveying, and ensuring the flatness of the diaphragm 30. Thus, it not only effectively adjusts the tension of the diaphragm 30 but also ensures the stable transmission of the diaphragm 30.

[0116] In some embodiments of this application, referring to FIG1, the total number of tension rollers is N, and along the conveying direction (e.g., the direction of the hollow arrow shown in FIG1), at least one first roller 10a is disposed between the m-th tension roller and the n-th tension roller, where m is the largest positive integer less than or equal to N / 3 and n is the smallest positive integer greater than or equal to 2N / 3.

[0117] In other words, among the multiple tension rollers between the m-th tension roller and the n-th tension roller, at least one tension roller can be the first roller 10a, or multiple tension rollers can be formed as the first roller 10a. For example, along the conveying direction, the i-th tension roller is the first roller 10a, where i is an integer and satisfies: N / 3≤i≤2N / 3.

[0118] In some specific examples, the diaphragm 30 winding device includes six tension rollers arranged in sequence, with three tension rollers arranged between the N / 3rd tension roller and the 2N / 3rd tension roller. That is, the 2nd to 4th tension rollers are all located within this range. Any one of the 2nd to 4th tension rollers can be set as the first roller 10a. For example, as shown in Figure 6, the 4th tension roller is set as the first roller 10a.

[0119] In some other specific examples, the diaphragm 30 winding device includes 16 tension rollers arranged in sequence, wherein the 6th to 10th tension rollers are all located between the mth tension roller and the nth tension roller. In this case, at least one of the 6th to 10th tension rollers is the first roller 10a. For example, as shown in Figure 1, the 7th tension roller is the first roller 10a.

[0120] In some other specific examples, as shown in Figure 2, the diaphragm 30 winding device includes 18 tension rollers arranged in sequence, wherein the 6th to 12th tension rollers are all located between the mth tension roller and the nth tension roller. In this case, among the 6th to 12th tension rollers, the 10th tension roller is the first roller 10a.

[0121] It should be noted that if the first roller 10a is not set between the m-th tension roller and the n-th tension roller, when the diaphragm 30 is conveyed in the middle conveying section between the m-th tension roller and the n-th tension roller, it will pass through a large number of second rollers 10b in sequence. This will cause the slight tension unevenness on multiple tension rollers to accumulate along the conveying direction, and the wrinkles caused by the tension unevenness on multiple tension rollers will accumulate in sequence along the conveying direction, thus affecting the final output state of the diaphragm 30.

[0122] In the above technical solution, by setting at least one first roller 10a between the m-th tension roller and the n-th tension roller, on the one hand, the tension of the diaphragm 30 in the middle section along the conveying direction can be effectively adjusted by the first roller 10a set in the middle section along the conveying direction, adjusting the uneven tension accumulated in the front section of the conveying direction, pulling and smoothing the wrinkles generated in the front section of the diaphragm 30 in the conveying direction, and reducing the probability of further development of wrinkles on the diaphragm 30; on the other hand, multiple first rollers 10a can be arranged relatively evenly along the conveying direction, reducing the situation of uncontrolled tension and increased wrinkles of the diaphragm 30 due to the lack of reasonable tension adjustment points in the middle section along the conveying direction, so that the diaphragm 30 can have a relatively stable tension state throughout the entire conveying process, thereby improving the quality of the diaphragm 30.

[0123] In some embodiments of this application, referring to FIG1, two or three of the plurality of first rollers 10a are arranged continuously along the conveying direction.

[0124] In other words, there can be two first rollers 10a arranged continuously along the conveying direction, or there can be three first rollers 10a arranged continuously along the conveying direction. Here, continuous arrangement means that no second roller 10b is set between two adjacent first rollers 10a.

[0125] Among them, there may be one or more groups of first rollers 10a arranged continuously, and each group of continuously arranged first rollers 10a contains two or three first rollers 10a.

[0126] During the conveying process of the diaphragm 30, the continuously arranged first rollers 10a can perform concentrated and continuous adjustment of the tension of the diaphragm 30. For example, if there is a complex tension problem in a certain local area of ​​the diaphragm 30, the continuous first rollers 10a can work together, and the first ribs 101 on multiple first rollers 10a can apply axial force to the diaphragm 30 in that area in turn, forming a relay-style precise correction, making the tension adjustment more efficient. This helps to quickly eliminate the uneven tension in that local area, thereby more effectively reducing the possibility of wrinkles in the diaphragm 30 and improving the overall flatness and quality of the diaphragm 30.

[0127] In the above technical solution, two or three of the multiple first rollers 10a are arranged continuously along the conveying direction, which can improve the adjustment efficiency of the tension of the diaphragm 30, realize the rapid elimination of uneven tension, and further reduce the possibility of wrinkles on the diaphragm 30.

[0128] In some embodiments of this application, referring to FIG1, the total number of tension rollers is N. Along the conveying direction, the (N-1)th tension roller and the Nth tension roller are both first rollers 10a, and the (N-2)th tension roller is a second roller 10b.

[0129] In other words, along the conveying direction, the last two tension rollers among the multiple tension rollers are both first rollers 10a with first ribs 101, and the third to last tension roller is a smooth second roller 10b. That is, at the very end of the conveying direction, two first rollers 10a are arranged continuously, thereby allowing the two first rollers 10a to be used to perform the final tension adjustment of the diaphragm 30 and to smooth out the wrinkles of the diaphragm 30.

[0130] Specifically, when the diaphragm 30 is about to finish conveying, the first roller 10a of the two continuously arranged first rollers 10a can make preliminary fine adjustments to the diaphragm 30 that is about to be output, and the second roller 10a can make further fine adjustments and improvements to the diaphragm 30 so that the diaphragm 30 is output with extremely uniform tension, greatly reducing the probability of wrinkles and ensuring high product quality.

[0131] Meanwhile, setting the third-to-last tension roller as the smooth second roller 10b allows the diaphragm 30 to smoothly transition and be conveyed before the final adjustment in the conveying direction, reducing the probability of tension disorder or new wrinkles caused by continuous strong adjustment and optimizing the overall conveying effect.

[0132] In the above technical solution, by using both the (N-1)th tension roller and the Nth tension roller as the first roller 10a, the tension of the diaphragm 30 can be controlled more precisely and efficiently at the end of the conveying process, thereby improving the uniformity of the tension of the diaphragm 30, further reducing wrinkles, and improving the output quality of the diaphragm 30. Using the (N-2)th tension roller as the second roller 10b allows the diaphragm 30 to transition smoothly, reducing the probability of tension disturbances and new wrinkles caused by continuous adjustments at the end, and effectively optimizing the entire conveying process of the diaphragm 30.

[0133] In some embodiments of this application, as shown in Figures 1 and 2, one or more second rollers 10b are provided between at least one set of two adjacent first rollers 10a along the conveying direction.

[0134] For example, one, two, three, four, five, six or more second rollers 10b can be provided between two first rollers 10a.

[0135] In some examples, the diaphragm 30 winding device is configured to include 13 tension rollers, wherein the 1st, 5th, 8th, 11th, and 13th tension rollers are all first rollers 10a, and the remaining tension rollers are second rollers 10b. In this case, the two first rollers 10a at positions 1 and 5 along the conveying direction are a group of first rollers 10a arranged adjacent to each other along the conveying direction, and three second rollers 10b are arranged between the two first rollers 10a. Similarly, the two first rollers 10a at positions 5 and 8 along the conveying direction are also a group of first rollers 10a arranged adjacent to each other, and two second rollers 10b are arranged between the two first rollers 10a. Similarly, the two first rollers 10a at positions 11 and 13 along the conveying direction are also a group of first rollers 10a arranged adjacent to each other, and one second roller 10b is arranged between the two first rollers 10a.

[0136] In the above technical solution, by providing one or more second rollers 10b between at least one set of two adjacent first rollers 10a, the one or more second rollers 10b between the two first rollers 10a can play a buffering role on the diaphragm 30, so that the tension fluctuation of the diaphragm 30 is controlled within a small range, and the tension adjustment of the diaphragm 30 is smoother and more continuous. At the same time, by providing one or more second rollers 10b, friction can be reduced and wear on the diaphragm 30 can be reduced.

[0137] In some embodiments of this application, as shown in Figures 1 and 2, along the conveying direction, the number of second rollers 10b between any two adjacent first rollers 10a is greater than or equal to 1 and less than or equal to 4.

[0138] For example, the number of second rollers 10b between any two adjacent first rollers 10a can be one, two, three, or four.

[0139] In the above technical solution, the number of second rollers 10b between any two adjacent first rollers 10a is greater than or equal to 1 and less than or equal to 4. This can effectively realize the transition and buffer between the tension adjustment of the two adjacent first rollers 10a, improve the output quality of the diaphragm 30, and also reduce the number of second rollers 10b, reduce the number of parts of the diaphragm 30 winding device, reduce the space occupied, and reduce costs.

[0140] In some embodiments of this application, as shown in Figures 1 and 3, the first ribs 101 on a plurality of first rollers 10a extend in the same direction in the circumferential direction of the first rollers 10a from one end to the other in the axial direction.

[0141] In some examples, multiple first rollers 10a are arranged parallel to each other and spaced apart. The first ribs 101 of the multiple first rollers 10a extend in the same circumferential direction in the axial direction from one end to the other. When the rotation directions of the multiple first rollers 10a are also the same, the direction of the first force on the first ribs 101 of each first roller 10a is the same. In this case, when the diaphragm 30 passes sequentially through two first rollers 10a with the same direction of the first force, the two first rollers 10a can pull the diaphragm 30 in the same axial direction successively, thereby improving the flattening efficiency of the diaphragm 30 and further reducing the probability of wrinkling of the diaphragm 30.

[0142] When a portion of the first rollers 10a rotates in the opposite direction to another portion of the first rollers 10a, the first forces of the first ribs 101 on the two first rollers 10a with opposite rotation directions are opposite. Thus, when the diaphragm 30 passes through the two first rollers 10a with opposite first forces in sequence, the two first rollers 10a can pull the diaphragm 30 toward both sides of the axial direction one after the other. This can improve the flattening efficiency of the diaphragm 30 and further reduce the probability of the diaphragm 30 wrinkling. On the other hand, it can reduce the probability of the diaphragm 30 shifting due to being continuously pulled by the first forces in the same direction.

[0143] In the above technical solution, by making the first ribs 101 on the multiple first rollers 10a extend in the same circumferential direction, when the two first rollers 10a rotate in the same direction, the two first rollers 10a can pull the diaphragm 30 in the same axial direction one after another, thereby improving the flattening efficiency of the diaphragm 30 and reducing the probability of wrinkling. By making the rotation directions of the two first rollers 10a opposite, the two first rollers 10a can pull the diaphragm 30 in both axial directions one after another, which can not only further reduce the probability of wrinkling of the diaphragm 30, but also reduce the probability of the diaphragm 30 shifting due to continuous pulling by the first force in the same direction.

[0144] In some embodiments of this application, as shown in Figures 10 and 11, the diaphragm tightening device 100 is configured to convey a diaphragm 30 with a thickness h greater than or equal to 5 μm and less than or equal to 10 μm.

[0145] For example, as shown in Figure 11, the diaphragm tightening device 100 is configured to be used to convey diaphragms 30 with a thickness h equal to 10μ, 9μ, 8μ, 7μ, 6μ or 5μ.

[0146] It should be noted that the smaller the thickness h of the diaphragm 30, the higher the probability of wrinkles and damage to the diaphragm 30 during the conveying process. In this embodiment, the diaphragm tightening device 100 can precisely control the conveying tension of the diaphragm 30 by cooperating with the first roller 10a and the second roller 10b, thereby reducing friction on the diaphragm 30, reducing the risk of damage to the diaphragm 30, and ensuring that the diaphragm 30 remains flat during the conveying process. This can meet the requirements for the integrity and flatness of the diaphragm 30 with a small thickness during the conveying process.

[0147] In the above technical solution, the diaphragm tightening device 100 is configured to transport a diaphragm 30 with a thickness h less than or equal to 10 μm, so as to meet the requirements of the flatness and integrity of the diaphragm 30 with a thickness less than 10 μm during the transport process.

[0148] In some embodiments of this application, as shown in Figures 10 and 11, the diaphragm tightening device 100 is configured to convey a diaphragm 30 with a thickness h greater than or equal to 5 μm and less than or equal to 8 μm.

[0149] For example, as shown in Figure 11, the diaphragm tightening device 100 is configured to be used to convey diaphragms 30 with a thickness h of 5μ, 5.5μ, 6μ, 6.5μ, 7μ, 7.5μ or 8μ.

[0150] In the above technical solution, the diaphragm tightening device 100 is configured to transport a diaphragm 30 with a thickness h of 5μ-8μ, thereby ensuring the flatness and integrity of the diaphragm 30 with a thickness of 5μ-8μ during the transport process.

[0151] It should be noted that the thickness of the diaphragm can be measured using a micrometer, an optical microscope and image analysis software, a capacitive thickness gauge or an ultrasonic thickness gauge.

[0152] When measuring the thickness of a diaphragm using a micrometer, a micrometer screw gauge with an accuracy of 0.001 mm can be used. The principle of the micrometer screw gauge is: by rotating the screw, the distance between the anvil and the micrometer screw changes slightly, thereby accurately measuring the thickness of the object. The following describes the method for measuring the thickness of a diaphragm using a micrometer.

[0153] First, prepare the samples. Randomly select at least 10 samples from the diaphragm material. The sample size should ideally be a square with a side length of 5cm-10cm or a circle with a diameter of 5cm-10cm. Ensure the sample surface is flat and free of wrinkles, damage, or other defects that could affect the measurement. Before measurement, calibrate the micrometer using a standard gauge block. After cleaning the anvil and micrometer screw, place the standard gauge block between the gauge blocks and rotate the ratchet until a "click" sound is heard. Check if the reading matches the nominal value; if not, adjust according to the instructions.

[0154] During measurement, each sample is divided into a 3x3 grid or similar sections, and the measurement is taken at the center of each section. The sample is placed vertically between the anvil and the micrometer screw, and the ratchet is slowly rotated to bring the micrometer screw close to the diaphragm. A "clicking" sound indicates a tight contact; at this point, the reading is taken and recorded. Measurements at different locations on all samples are completed using this method.

[0155] After measurement, the data is processed. First, all measured data are summed and divided by the total to obtain the average. Then, the standard deviation is calculated using the standard deviation formula to measure the degree of data dispersion, thereby assessing the uniformity of the diaphragm thickness. Through these steps, the diaphragm thickness can be measured relatively accurately using a micrometer.

[0156] In some embodiments of this application, as shown in FIG3, the first rib 101 extends spirally in a direction from one axial end of the first roller 10a toward the other end.

[0157] In this embodiment, the first rib 101 extends spirally along the axial direction of the first roller 10a. When the first roller 10a rotates, the diaphragm 30 is subjected to force sequentially along the axial direction of the first roller 10a. This reduces the probability of localized force concentration on the diaphragm 30, making the first force applied by the first rib 101 to the diaphragm 30 more uniform and reducing the probability of wrinkles due to uneven force. In addition, the spirally extending first rib 101 can enhance the gripping force of the first roller 10a on the diaphragm 30, reducing the probability of the diaphragm 30 slipping or shifting, and improving the stability of the diaphragm 30 during the conveying process.

[0158] In the above technical solution, the first rib 101 extends spirally in the axial direction of the first roller 10a, which can make the first force applied by the first rib 101 to the diaphragm 30 more uniform, reduce the probability of wrinkles due to uneven force, and also enhance the gripping force of the first roller 10a on the diaphragm 30, reduce the probability of the diaphragm 30 slipping or shifting, and improve the stability of the diaphragm 30 during the conveying process.

[0159] In some embodiments of this application, as shown in FIG3, the number of first ribs 101 on at least one first roller 10a is one, and the pitch d1 of the first rib 101 spirally extending is greater than or equal to 5 mm and less than or equal to 50 mm.

[0160] For example, among a plurality of first rollers 10a, only one first roller 10a may have a spirally extending first rib 101, a portion of the first rollers 10a may have a spirally extending first rib 101, or each first roller 10a may have a spirally extending first rib 101.

[0161] For example, a first rib 101 is provided on the first roller 10a. The first rib 101 extends spirally in the axial direction of the first roller 10a. The pitch d1 of the first rib 101 can be 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, 15mm, 10mm or 5mm, etc.

[0162] When there is only one first rib 101 and the pitch d1 of the first rib 101 satisfies 5mm≤d1≤50mm, during the rotation of the first roller 10a, the force exerted by the first rib 101 on the diaphragm 30 can be more evenly and densely distributed in the axial direction, thereby reducing the uneven local tension of the diaphragm 30 caused by excessive force intervals, and thus reducing the probability of wrinkles.

[0163] In the above technical solution, a first rib 101 is provided on the first roller 10a, and the pitch d1 of the spiral extension of the first rib 101 is greater than or equal to 5 mm and less than or equal to 50 mm. This can make the force of the first rib 101 on the diaphragm 30 more evenly and densely distributed in the axial direction, thereby reducing the uneven local tension of the diaphragm 30 caused by excessive force interval, and thus reducing the probability of wrinkles.

[0164] In some embodiments of this application, as shown in FIG3, the pitch d1 of the first rib 101 spirally extends is greater than or equal to 10 mm and less than or equal to 20 mm.

[0165] For example, the pitch d1 of the first rib 101 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0166] In the above technical solution, a first rib 101 is provided on the first roller 10a, and the pitch d1 of the spiral extension of the first rib 101 is 10mm-20mm. This can make the force of the first rib 101 on the diaphragm 30 more evenly and densely distributed in the axial direction, thereby further reducing the uneven local tension on the diaphragm 30 and further reducing the probability of wrinkles.

[0167] It should be noted that tools such as vernier calipers, micrometers, flexible measuring tapes, or tape measures can be used to measure the pitch d1 of the first rib 101 on the first roller 10a. For example, when using vernier calipers to measure the pitch of the first rib of the first roller, the first roller and vernier calipers should be cleaned first to avoid impurities affecting accuracy. Then, determine the starting point of the measurement, choosing a prominent location, such as the intersection of the first rib and the edge of the outer circumference of the first roller. Next, determine the number of rotations; to reduce error, it is recommended to measure 5-10 rotations. During measurement, place the caliper feet parallel to the axis of the first roller and move them along the spiral direction of the first rib, reading the length L after crossing the selected number of rotations. Calculate the pitch using the formula d1 = L / n, where n is the number of rotations. To improve accuracy, multiple measurements should be taken at different positions on the first roller, following the above steps for each measurement. Finally, add the multiple pitch values ​​and divide by the number of measurements; the average value obtained is the more accurate pitch of the first rib.

[0168] In some embodiments of this application, as shown in FIG4, there are multiple first ribs 101 on at least one first roller 10a. The spiral extension direction of the multiple first ribs 101 on the first roller is the same. In the axial direction of the first roller 10a, the distance d2 between two adjacent first ribs 101 is greater than or equal to 5 mm and less than or equal to 50 mm.

[0169] For example, among a plurality of first rollers 10a, only one first roller 10a may be provided with a plurality of first ribs 101 with the same spiral, a portion of the first rollers 10a may be provided with a plurality of spirally extending first ribs 101, or each first roller 10a may be provided with a plurality of spirally extending first ribs 101.

[0170] For example, the number of first ribs 101 on the first roller 10a can be two, three, four, five, six, seven, eight, nine, ten, twelve, fifteen or more, etc.

[0171] During diaphragm 30 conveying, multiple first ribs 101 can apply axial first force from multiple positions with the same pattern, making the force on diaphragm 30 more uniform and further reducing wrinkles caused by uneven local force. Simultaneously, since multiple first ribs 101 can apply the first force to diaphragm 30 at the same time, it also enhances the ability to adjust the tension of diaphragm 30. Furthermore, multiple first ribs 101 can increase the contact area with diaphragm 30, improve the gripping force on diaphragm 30, and ensure the stability of diaphragm 30 during conveying. This is especially suitable for ultra-thin or wide diaphragms 30 with high requirements for flatness and conveying stability, ensuring high-quality conveying of diaphragm 30.

[0172] In the above technical solution, by setting the spiral extension direction of multiple first ribs 101 on the first roller 10a to be the same, the multiple first ribs 101 can apply the axial first force from multiple positions in the same pattern, making the force on the diaphragm 30 more uniform, further reducing wrinkles caused by uneven local force, and also enhancing the ability to adjust the tension of the diaphragm 30, increasing the contact area with the diaphragm 30, improving the gripping force on the diaphragm 30, and ensuring the stability of the diaphragm 30 during the conveying process.

[0173] In some embodiments of this application, as shown in FIG4, the distance d2 between two adjacent first ribs 101 in the axial direction of the first roller 10a is greater than or equal to 5 mm and less than or equal to 50 mm.

[0174] For example, the distance d2 between two adjacent first ribs 101 in the axial direction of the first roller 10a can be 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, 15mm, 10mm or 5mm, etc.

[0175] When the distance d2 between adjacent first ribs 101 satisfies 5mm≤d2≤50mm, during the conveying process of diaphragm 30, multiple first ribs 101 can cooperate with each other to form a tight and continuous force area on diaphragm 30. This not only enhances the overall gripping force on diaphragm 30 and reduces the probability of diaphragm 30 slipping during conveying, but also allows multiple first ribs 101 to make timely fine adjustments for tension changes at different positions, further improving the stability and flatness of diaphragm 30 conveying.

[0176] In the above technical solution, the spacing d2 between adjacent first ribs 101 satisfies: 5mm≤d2≤50mm, which can enhance the overall gripping force on the diaphragm 30, reduce the probability of the diaphragm 30 slipping during conveying, and also allow for timely fine-tuning for tension changes at different positions, further improving the stability and flatness of the diaphragm 30 during conveying.

[0177] In some embodiments of this application, as shown in FIG4, the distance d2 between two adjacent first ribs 101 in the axial direction of the first roller 10a is greater than or equal to 10 mm and less than or equal to 20 mm.

[0178] For example, the distance d2 between two adjacent first ribs 101 in the axial direction of the first roller 10a can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0179] In the above technical solution, the spacing d2 between adjacent first ribs 101 is 10mm-20mm, which can further enhance the overall gripping force on the diaphragm 30, further reduce the probability of the diaphragm 30 slipping, and can also make fine adjustments more timely for tension changes at different positions of the diaphragm 30, thereby improving the stability and flatness of the diaphragm 30 conveying.

[0180] It should be noted that the distance d2 between two adjacent first ribs 101 on the first roller 10a can be measured using tools such as a laser rangefinder, vernier caliper, microscope, and image measurement software.

[0181] For example, when using a vernier caliper to measure the distance d2 between two adjacent first ribs 101 on the first roller 10a, firstly, clean the measuring surface of the vernier caliper to ensure no impurities affect the measurement. Check the accuracy of the vernier caliper and verify that the zero mark of the vernier scale is aligned with the zero mark of the main scale. If they are not aligned, calibration is required. Then, locate the measuring point. Specifically, select two adjacent first ribs on the first roller. To ensure measurement accuracy, choose a relatively flat and clear section of the first rib. Determine two measuring points along the axial direction of the first rib, ensuring that the measuring surface of the vernier caliper is perpendicular to the axial direction of the first rib. Next, place the two measuring surfaces of the vernier caliper close to the two adjacent first ribs. Gently push the vernier caliper to ensure close contact between the measuring surface and the first rib, while keeping the caliper parallel to the axial direction of the first roller. Read the reading on the vernier caliper; this reading is the distance between the two adjacent first ribs at the measuring point. Finally, the average value of multiple measurements is taken. To obtain a more accurate spacing value, at least three measurements need to be taken at different locations for two adjacent first ribs, and then the average value of these measurements is calculated.

[0182] In some embodiments of this application, as shown in FIG5, the first roller 10a includes a first segment 102 and a second segment 103 connected in the axial direction. The first roller 10a has a plurality of first ribs 101, which are respectively formed on the first segment 102 and the second segment 103. In the axial direction of the first roller, the first ribs 101 on the first segment 102 and the first ribs 101 on the second segment 103 both extend spirally along the circumferential direction of the first roller, and the spiral extension directions of the first ribs 101 on the first segment 102 and the first ribs 101 on the second segment (103) are opposite.

[0183] The first rib 101 on the first segment 102 and the first rib 101 on the second segment 103 are arranged symmetrically. In the axial direction of the first roller 10a, the direction of the first force of the first rib 101 on the first segment 102 is away from the direction of the second segment 103, and the direction of the first force of the first rib 101 on the second segment 103 is away from the direction of the first segment 102.

[0184] In some examples, the number of first ribs 101 on the first segment 102 can be one, and the helical pitch of the first rib 101 on the first segment 102 is greater than or equal to 5 mm and less than or equal to 50 mm. Further, the helical pitch of the first rib 101 on the first segment 102 is greater than or equal to 10 mm and less than or equal to 20 mm. This allows the force exerted by the first rib 101 on the diaphragm 30 on the first segment to be more evenly and densely distributed in the axial direction, further reducing local tension unevenness on the diaphragm 30 in the first segment 102 region, and further reducing the probability of wrinkle formation.

[0185] In some examples, as shown in Figure 5, there are multiple first ribs 101 on the first segment 102, and the spiral extension direction of the multiple first ribs 101 on the first segment 102 is the same. In the axial direction of the first roller 10a, the distance d3 between two adjacent first ribs 101 on the first segment 102 is greater than or equal to 5 mm and less than or equal to 50 mm. Further, the distance d3 between two adjacent first ribs 101 on the first segment 102 is greater than or equal to 10 mm and less than or equal to 20 mm. As a result, the overall gripping force of the first segment 102 on the diaphragm 30 can be further enhanced, the probability of the diaphragm 30 slipping on the first segment 102 can be further reduced, and fine-tuning can be performed more promptly for tension changes at different positions of the diaphragm 30, thereby improving the stability and flatness of the diaphragm 30 conveying.

[0186] In some examples, the number of first ribs 101 on the second segment 103 can be one, and the spiral pitch of the first rib 101 on the second segment 103 is greater than or equal to 5 mm and less than or equal to 50 mm. Further, the spiral pitch of the first rib 101 on the second segment 103 is greater than or equal to 10 mm and less than or equal to 20 mm. This allows the force exerted by the first rib 101 on the diaphragm 30 on the second segment 103 to be more evenly and densely distributed in the axial direction, further reducing local tension unevenness on the diaphragm 30 within the region of the second segment 103, and further reducing the probability of wrinkle formation.

[0187] In some examples, as shown in Figure 5, there are multiple first ribs 101 on the second segment 103, and the spiral extension direction of the multiple first ribs 101 on the second segment 103 is the same. Furthermore, in the axial direction of the first roller 10a, the distance d4 between two adjacent first ribs 101 on the second segment 103 is greater than or equal to 5 mm and less than or equal to 50 mm. Further, the distance d4 between two adjacent first ribs 101 on the second segment 103 is greater than or equal to 10 mm and less than or equal to 20 mm. This further enhances the overall gripping force of the second segment 103 on the diaphragm 30, further reduces the probability of the diaphragm 30 slipping on the second segment 103, and allows for more timely fine-tuning of tension changes at different positions of the diaphragm 30, improving the stability and flatness of the diaphragm 30 conveying.

[0188] In this embodiment, the spiral extension directions of the first rib 101 on the first segment 102 and the first rib 101 on the second segment (103) are opposite. During the conveying of the diaphragm 30, the first rib 101 on the first segment 102 and the first rib 101 on the second segment 103 can simultaneously apply opposite forces to the diaphragm 30, so that the forces on both sides of the diaphragm 30 in the width direction are balanced. This reduces the probability that the diaphragm 30 will deviate due to unilateral force, ensuring that the diaphragm 30 is always conveyed along the correct path. At the same time, the first force of the first rib 101 on the first segment 102 and the first force of the first rib 101 on the second segment 103 can balance the tension of the diaphragm 30 in the axial direction of the first roller 10a, counteracting the uneven tension of the diaphragm 30 caused by local stretching or friction, reducing the probability of wrinkles caused by tension differences, and improving the flatness of the diaphragm 30 during the conveying process.

[0189] In the above technical solution, the first roller 10a includes a first section 102 and a second section 103 connected in the axial direction. The spiral extension direction of the first rib 101 on the first section 102 is opposite to that of the first rib 101 on the second section 103. This allows the direction of the first force of the first rib 101 on the first section 102 to be opposite to the direction of the first force of the first rib 101 on the second section 103. This reduces the probability of the diaphragm 30 shifting due to unilateral force, ensuring that the diaphragm 30 is always conveyed along the correct path. It also balances the tension of the diaphragm 30 in the axial direction of the first roller 10a, counteracting the uneven tension caused by local stretching or friction, reducing the probability of wrinkles caused by tension differences, and improving the flatness of the diaphragm 30 during the conveying process.

[0190] In some embodiments of this application, as shown in FIG5, the first rib 101 on the first segment 102 and the first rib 101 on the second segment 103 are arranged symmetrically about the vertical plane of the first line segment. The first line segment is parallel to the central axis of the first roller 10a, and in the axial direction of the first roller 10a, one end of the first line segment is flush with the end of the first rib 101 on the first segment 102 that is away from the second segment 103, and the other end of the first line segment is flush with the end of the first rib 101 on the second segment 103 that is away from the first segment 102.

[0191] When the diaphragm is tensioned on the first roller and the first roller rotates, the first force exerted by the first rib 101 on the diaphragm on the first section 102 is directed away from the second section 103, and the first force exerted by the first rib 101 on the diaphragm on the second section 103 is directed away from the first section 102. Furthermore, the magnitude of the first force exerted by the first rib 101 on the diaphragm on the first section 102 is approximately equal to the magnitude of the first force exerted by the first rib 101 on the diaphragm on the second section 103, and their directions are opposite.

[0192] This allows the forces on both sides of the diaphragm 30 in the width direction to be balanced, reducing the probability of the diaphragm 30 shifting due to unilateral force, and ensuring that the diaphragm 30 always transports along the correct path.

[0193] In the above technical solution, the first rib 101 on the first section 102 and the first rib 101 on the second section 103 are arranged symmetrically, so that the first force of the first rib 101 on the first section 102 and the first force of the first rib 101 on the second section 103 are approximately equal in magnitude and opposite in direction. As a result, the forces on both sides of the diaphragm 30 in the width direction are balanced, reducing the probability of wrinkles caused by tension differences and improving the flatness of the diaphragm 30 during the conveying process.

[0194] In some embodiments of this application, as shown in FIG5, the first rib 101 on the first segment 102 is connected to the first rib 101 on the second segment 103.

[0195] For example, the first segment 102 is provided with a plurality of first ribs 101, which are arranged in parallel and at intervals. The second segment 103 is provided with a plurality of first ribs 101 arranged in parallel and at intervals. The plurality of first ribs 101 on the first segment 102 corresponds one-to-one with the plurality of first ribs 101 on the second segment 103, and the first ribs 101 on the first segment 102 are connected to the corresponding first ribs 101 on the second segment 103.

[0196] In the above technical solution, the first rib 101 on the first section 102 is connected to the first rib 101 on the second section 103, which can enhance the continuity of the force on the diaphragm 30, so that the force on the diaphragm 30 at the connection between the first section 102 and the second section 103 can be smoothly transitioned, reducing the probability of wrinkles or displacement caused by sudden changes in force. At the same time, it can also enhance the gripping force of the first roller 10a on the diaphragm 30, reduce the probability of the diaphragm 30 slipping, ensure that the diaphragm 30 is subjected to uniform force during conveying, and improve the stability of tension adjustment.

[0197] In some embodiments of this application, as shown in Figures 3-5, the included angle α between the central axis of the first rib 101 and the first roller 10a is greater than or equal to 50° and less than or equal to 80°.

[0198] For example, the included angle α between the central axis of the first rib 101 and the first roller 10a can be 50°, 52°, 55°, 58°, 60°, 62°, 65°, 68°, 70°, 72°, 75°, 78° or 80°.

[0199] The included angle α between the central axis of the first rib 101 and the first roller 10a is greater than or equal to 50° and less than or equal to 80°, which allows the force exerted by the first rib 101 on the diaphragm 30 to have appropriate axial and circumferential components. The axial component can effectively control the tension of the diaphragm 30 in the width direction, avoiding wrinkles or deviation due to uneven tension; the circumferential component can provide sufficient friction to make the diaphragm 30 rotate stably with the first roller 10a, reducing the probability of the diaphragm 30 slipping.

[0200] Meanwhile, the included angle α between the central axis of the first rib 101 and the first roller 10a is greater than or equal to 50° and less than or equal to 80°, which can make the contact area between the first rib 101 and the diaphragm 30 moderate. Under the premise of ensuring the gripping force on the diaphragm 30, it will not cause friction damage due to excessive contact area, thus facilitating the stable, efficient and low-damage conveying of the diaphragm 30.

[0201] In the above technical solution, the included angle α between the first rib 101 and the central axis of the first roller 10a is 50°-80°. This allows the force generated by the first rib 101 to effectively regulate the tension of the diaphragm 30 in the width direction, avoiding wrinkles or deviation due to uneven tension. It also provides sufficient friction to ensure that the diaphragm 30 rotates stably with the first roller 10a, reducing the probability of the diaphragm 30 slipping. Furthermore, it facilitates stable, efficient, and low-damage conveying of the diaphragm 30.

[0202] It should be noted that the angle α between the central axis of the first rib 101 and the first roller 10a can be measured using tools such as a protractor, a trigonometric measuring tool, and a three-dimensional coordinate measuring machine. The protractor can be a standard semi-circular protractor or a specially designed protractor with a magnetic base to facilitate angle measurement on the first roller. The trigonometric measuring tool can be a caliper with trigonometric calculation functions or a professional trigonometric measuring instrument. By measuring parameters such as the axial and radial lengths of the first rib, the angle can be calculated using trigonometric relationships. The three-dimensional coordinate measuring machine can accurately measure the spatial position of the central axis of the first rib and the first roller, and then calculate the angle between them using software.

[0203] When measuring the angle α between the central axis of the first rib 101 and the first roller 10a using a protractor, firstly, the first roller is placed securely to prevent it from rolling, and the surface of the first roller and the protractor are cleaned to avoid interference from impurities. Next, a reference is established by using the characteristics of both ends of the first roller to determine its central axis direction. A flat reference plane perpendicular to the central axis is found on the side of the first roller, intersecting the first rib. Then, the measurement is performed by placing the bottom edge of the protractor against the reference plane, ensuring the center of the protractor is at the intersection of the first rib and the reference plane, and that the protractor plane is parallel to the side of the first roller. The angle value on the protractor is read along the direction of the first rib. Finally, multiple measurements are taken at different positions, and the average value is calculated to obtain the angle α.

[0204] In some embodiments of this application, as shown in Figures 3-6, the ratio of the length of the first rib 101 in the axial direction of the first roller 10a to the length of the first roller 10a is greater than or equal to 0.5 and less than or equal to 1.

[0205] In other words, when projected from the circumferential surface of the first roller 10a toward the central axis of the first roller 10a, the ratio of the projected length of the first rib 101 on the central axis of the first roller 10a to the total length of the first roller 10a is greater than or equal to 0.5 and less than or equal to 1.

[0206] For example, the ratio of the length of the first rib 101 in the axial direction to the length of the first roller 10a can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or 1, etc.

[0207] It should be noted that when the projected length of the first rib 101 in the axial direction of the first roller 10a is too short, for example, when the axial length of the first rib 101 in the axial direction of the first roller 10a is less than half the total length of the first roller 10a, it will severely affect the range of action of the first rib 101 on the diaphragm 30 in the width direction. This will cause the first rib 101 to act only locally on the diaphragm 30, resulting in a severely uneven tension distribution of the diaphragm 30 in the width direction, leading to deformations such as wrinkles and twists, and affecting the flatness of the diaphragm 30. At the same time, because the length of the first rib 101 is short, the area of ​​action on the diaphragm 30 is small, and the contact area with the diaphragm 30 is insufficient, resulting in a weakened gripping force of the first roller 10a on the diaphragm 30. The diaphragm 30 is prone to slipping during the conveying process, making it impossible to accurately control the conveying position and speed of the diaphragm 30.

[0208] In the above technical solution, the ratio of the length of the first rib 101 in the axial direction to the length of the first roller 10a is greater than or equal to 0.5 and less than or equal to 1. This allows the first rib 101 to have sufficient length in the axial direction of the first roller 10a. Consequently, the first rib 101 can apply a more uniform axial force to the diaphragm 30, reducing the probability of uneven tension caused by the lack of local force, reducing the risk of wrinkles and twists in the diaphragm 30, and improving the flatness of the diaphragm 30 during conveying. At the same time, the sufficient length of the first rib 101 can increase the contact area between the first rib 101 and the diaphragm 30, improve the gripping force, make the diaphragm 30 more stable during conveying, less prone to slippage or deviation, and improve conveying accuracy.

[0209] The length of the first rib 101 along the axial direction of the first roller 10a can be directly measured by calipers or a measuring tape.

[0210] In some embodiments of this application, as shown in FIG6, the first rib 101 is a raised rib formed on the circumferential surface of the first roller 10a and protruding outward in the radial direction.

[0211] In the above technical solution, the first rib 101 is a raised rib formed on the circumferential surface of the first roller 10a and protruding outward in the radial direction. It can improve the structural strength of the first roller 10a, and the processing technology is relatively simple, which can shorten the production cycle and reduce costs.

[0212] In some embodiments of this application, referring to FIG3, the surface of the first roller 10a is formed with recessed grooves. In the direction from one end of the first roller 10a to the other end in the axial direction, the grooves extend obliquely toward the circumferential direction of the first roller 10a. The number of grooves is one, and the first rib 101 is formed between two adjacent groove segments in the axial direction. Alternatively, the number of grooves is multiple, and the first rib 101 is formed between two adjacent grooves in the axial direction.

[0213] In the above technical solution, by processing grooves on the surface of the first roller 10a to form the first rib 101, the heat dissipation effect and chip removal performance of the first roller 10a can be improved, and the conveying quality of the diaphragm 30 can be enhanced, while achieving precise tension adjustment.

[0214] In some embodiments of this application, as shown in Figures 6 and 7, the height H1 of the first rib 101 in the radial direction of the first roller 10a is greater than or equal to 1 mm and less than or equal to 10 mm.

[0215] For example, as shown in Figures 6 and 7, the height H1 of the first rib 101 in the radial direction of the first roller 10a can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0216] In the above technical solution, the height H1 of the first rib 101 is greater than or equal to 1 mm and less than or equal to 10 mm. The first rib 101 can provide sufficient friction and gripping force to the diaphragm 30 to ensure stable conveying of the diaphragm 30, while reducing the risk of excessive squeezing or damage to the diaphragm 30 and reducing the probability of indentations and damage on the surface of the diaphragm 30.

[0217] In some embodiments of this application, the height H1 of the first rib 101 in the radial direction of the first roller 10a is greater than or equal to 3 mm and less than or equal to 6 mm.

[0218] For example, the height H1 of the first rib 101 in the radial direction of the first roller 10a can be: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm or 6mm.

[0219] In the above technical solution, the height H1 of the first rib 101 is greater than or equal to 3mm and less than or equal to 6mm. This not only provides appropriate friction for the diaphragm 30, allowing it to stably follow the rotation of the first roller 10a during conveying and reducing the probability of slippage, but also effectively adjusts the tension of the diaphragm 30, reducing the probability of wrinkles caused by uneven tension. Furthermore, it reduces the probability of excessive pressure on the diaphragm 30 due to excessive height of the first rib 101, thus lowering the risk of diaphragm 30 breakage. In addition, a height H1 of 3mm-6mm for the first rib 101 also improves the stability of the first roller 10a during rotation, reducing the risk of rotational imbalance caused by excessive height of the first rib 101.

[0220] It should be noted that the height H1 of the first rib 101 in the radial direction of the first roller 10a can be measured using tools such as depth calipers, micrometers, and optical profilometers. The following is a simple description of the procedure for measuring the height H1 of the first rib 101 in the radial direction of the first roller 10a using depth calipers. First, clean the surface of the first roller and the depth caliper, check the accuracy of the depth caliper, and check if the zero marks of the main scale and vernier scale are aligned. If there is a deviation, calibration is required. Second, determine the measurement position. On the radial direction of the first roller, select a relatively regular position of the first rib without obvious damage for measurement. To reduce errors, it is best to perform multiple measurements at different positions on the first rib, for example, once at each end and once in the middle of the rib. Third, perform the measurement operation. Place the base of the depth caliper flat on the surface of the first roller (excluding the first rib), so that the measuring rod of the depth caliper is perpendicular to the surface of the first roller, and the lower end of the measuring rod is aligned with the top of the first rib. Slowly adjust the vernier scale of the depth caliper so that the measuring rod lightly touches the top of the first rib. At this point, read the reading on the depth caliper; this reading is the height H1 of the first rib. Fourth, after taking measurements at multiple locations along the first rib, record the obtained measurement data. Calculate the average of these measurement data as the height H1 of the first rib.

[0221] In some embodiments of this application, as shown in FIG8, the thickness H2 of the first rib 101 is greater than or equal to 1 mm and less than or equal to 10 mm in the direction perpendicular to the extension direction of the first rib 101.

[0222] For example, in the direction perpendicular to the extension direction of the first rib 101, the thickness H2 of the first rib 101 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0223] It should be noted that when the thickness H2 of the first rib 101 is too thick, for example, when the thickness H2 of the first rib 101 exceeds 10mm, the excessively thick first rib 101 will cause excessive local stress on the diaphragm 30, which can easily leave indentations on the surface of the diaphragm 30, or even cause the diaphragm 30 to break, affecting the quality of the diaphragm 30. The excessively thick first rib 101 will increase the imbalance of the first roller 10a, causing the first roller 10a to generate large vibrations when rotating. This will not only reduce the conveying accuracy of the diaphragm 30, but also aggravate equipment wear, shorten the service life of the equipment, and increase energy consumption.

[0224] In the above technical solution, the thickness H2 of the first rib 101 is less than or equal to 10mm, which can make the thickness of the first rib 101 moderate. This not only reduces the risk of excessive local pressure on the diaphragm 30 and the probability of indentation or damage to the diaphragm 30, ensuring the smoothness of the diaphragm 30 surface, but also improves the rotational balance performance of the first roller 10a, improves the conveying accuracy of the diaphragm 30, and reduces vibration and noise.

[0225] In some embodiments of this application, the thickness H2 of the first rib 101 is greater than or equal to 3 mm and less than or equal to 6 mm in the direction perpendicular to the extension direction of the first rib 101.

[0226] For example, the thickness H2 of the first rib 101 perpendicular to its extension direction can be: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm or 6mm.

[0227] In the above technical solution, the thickness H2 of the first rib 101 is greater than or equal to 3mm and less than or equal to 6mm. This not only provides sufficient support and friction for the diaphragm 30, improving the stability of the diaphragm 30's conveying and reducing the probability of the diaphragm 30 slipping, but also reduces the risk of excessive compression of the diaphragm 30, lowering the probability of damage caused by compression. Furthermore, it helps maintain the rotational balance of the first roller 10a, reduces vibration, ensures stable equipment operation, and improves the conveying accuracy and quality of the diaphragm 30.

[0228] It should be noted that the thickness H2 of the first rib 101 perpendicular to its extension direction can be measured using tools such as vernier calipers, micrometers, and optical image measuring instruments. The following is a brief description of the procedure for measuring the thickness H2 of the first rib 101 perpendicular to its extension direction using vernier calipers. First, clean the first roller and the vernier caliper. Check the accuracy of the vernier caliper by closing the outer measuring jaws and checking if the zero marks of the main scale and vernier scale are aligned. If not, calibration is required. Second, locate the measurement point: In a plane perpendicular to the spiral extension direction of the first rib, find a relatively regular and uniformly thick section of the first rib as the measurement point. To reduce measurement error, it is best to select multiple measurement points at different locations on the first rib; for example, a measurement point can be selected at regular intervals along the length of the first rib. Third, measurement operation: Gently clamp the first rib with the outer measuring jaws of the vernier caliper perpendicular to the spiral extension direction. Ensure the measuring jaws are in close contact with the surface of the first rib, but do not apply excessive force to avoid deformation of the first rib. Read the reading on the vernier caliper; this reading is the thickness H2 of the first rib at that measurement point. Fourth, data processing: Record the multiple thickness data obtained from measuring the first rib at different locations, and calculate the average of these measurement data as the thickness H2 of the first rib.

[0229] Secondly, this application also provides a winding device 1A, as shown in Figures 10 and 12. The winding device 1A is used to wind an electrode assembly 300, which includes an electrode sheet and a diaphragm. The winding device 1A includes a diaphragm tightening device 100 of any of the above embodiments, which is used to transport the diaphragm.

[0230] In some embodiments, as shown in FIG12, the electrode assembly 300 includes a positive electrode 31 and a negative electrode 32, and the separator includes an upper separator 30a and a lower separator 30b. The upper separator 30a and the lower separator 30b are respectively arranged on the upper and lower sides of the negative electrode 32, and the positive electrode 31 and the negative electrode 32 are separated by the upper separator 30a and the lower separator 30b.

[0231] In some embodiments, the winding equipment 1A includes multiple unwinding mechanisms, including a positive electrode unwinding mechanism, a negative electrode unwinding mechanism, an upper diaphragm unwinding mechanism, and a lower diaphragm unwinding mechanism. The positive electrode unwinding mechanism includes an unwinding roller and a tension controller. The unwinding roller is used to carry the wound positive electrode 31. The tension controller can monitor and adjust the tension of the positive electrode 31 in real time during the unwinding process to ensure that the positive electrode 31 maintains appropriate tension during the conveying process and avoids problems such as wrinkles and stretching deformation caused by uneven tension.

[0232] The negative electrode unwinding mechanism is similar to the positive electrode unwinding mechanism, and is used to achieve smooth unwinding of the negative electrode 32. The negative electrode 32 unwinding mechanism also includes an unwinding roller and a tension controller to ensure the quality and stability of the unwinding of the negative electrode 32.

[0233] Both the upper diaphragm unwinding mechanism and the lower diaphragm unwinding mechanism are similar in structure to the positive electrode unwinding mechanism, and both include an unwinding roller and a tension controller. The diaphragm roll is placed on the unwinding roller, and the tension controller is used to control the tension of the upper diaphragm 30a and the lower diaphragm 30b during the unwinding process.

[0234] In some embodiments, the winding equipment 1A includes multiple conveying devices, including a positive electrode sheet conveying device, a negative electrode sheet conveying device, an upper diaphragm tightening device, and a lower diaphragm tightening device. Each conveying device includes a set of conveying rollers and a deviation correction device. The transmission rollers include multiple parallel rollers for conveying the positive electrode sheet 31, the negative electrode sheet 32, the upper diaphragm 30a, and the lower diaphragm 30b according to a set path and speed. During the conveying process, due to factors such as the flatness of the material itself and the unwinding tension, the electrode sheets and diaphragms may deviate. The deviation correction device uses sensors to detect the edge position of the material in real time. Once a deviation is detected, the speed or angle of the conveying rollers is immediately adjusted through the control system to return the material to the correct conveying path, ensuring the winding accuracy.

[0235] In some embodiments, the upper diaphragm tightening device and the lower diaphragm tightening device are both diaphragm tightening devices 100 of any of the above embodiments.

[0236] In some embodiments, the winding apparatus 1A further includes a stacking device, an alignment mechanism, and a winding mechanism. The stacking device is used to stack the conveyed positive electrode 31, negative electrode 32, upper diaphragm 30a, and lower diaphragm 30b in a predetermined order. The alignment mechanism uses a fine-tuning device to precisely adjust the electrode assembly 300 to ensure that each layer of material is fully aligned in the length and width directions, providing a good foundation for subsequent winding.

[0237] The winding mechanism includes a winding needle and a pressure roller. The winding needle rotates under the drive of a motor, which drives the stacked electrode assembly 300 to be wound around it. The pressure roller applies a certain pressure to the electrode assembly 300 being wound, so that the winding layers are more compact and prevent problems such as loosening and delamination.

[0238] In the above technical solution, since the winding equipment 1A is equipped with the aforementioned diaphragm tightening device 100, and since the diaphragm tightening device 100 is used to transport the diaphragm of the electrode assembly 300, the plurality of tension rollers of the diaphragm tightening device 100 includes at least three first rollers 10a and second rollers 10b. Two of the plurality of first rollers 10a are respectively arranged at the upstream and downstream ends of the plurality of tension rollers. The second roller 10b is a smooth roller. A first rib 101 is formed on the first roller 10a. The first rib 101 extends obliquely along the circumference of the first roller 10a in the direction from one end of the axial direction to the other end. In this way, the first roller 10a can apply a first force toward at least one end of the axial direction to the diaphragm through the first rib 101. Thus, the upstream first roller 10a can adjust the initial tension of the diaphragm 30 through the first rib 101 and correct the deviation during feeding. The first roller 10a in the middle position can correct uneven tension in the conveying process in real time through the first rib 101, stabilizing the conveying process of the diaphragm 30. The first roller 10a at the downstream end can make the diaphragm 30 leave with uniform tension through the first rib 101. Thus, the tension of the diaphragm 30 can be guaranteed to be uniform throughout the process, effectively reducing the probability of wrinkles and improving the quality and production efficiency of the diaphragm 30. At the same time, a smooth second roller 10b is also provided among the multiple tension rollers. The second roller 10b can reduce the probability of over-adjustment or additional wrinkles when there are too many first rollers 10a. It can also play a buffering role and reduce wear on the diaphragm 30. Thus, the diaphragm tightening device 100 can effectively adjust the tension and reduce wrinkles, while improving the stability and surface quality of the diaphragm 30 during the conveying process, thereby improving the winding efficiency and finished product quality of the winding equipment 1A for the electrode assembly 300.

[0239] A winding apparatus 1A according to a specific embodiment of the present application will now be described with reference to Figures 1-12.

[0240] Example 1,

[0241] The winding equipment 1A is used to wind the electrode assembly 300, as shown in Figure 12. The electrode assembly 300 includes a positive electrode 31, a negative electrode 32, an upper diaphragm 30a, and a lower diaphragm 30b. The winding equipment 1A includes a diaphragm tightening device 100 and a winding mechanism. There are two diaphragm tightening devices 100, which are used to transport the upper diaphragm 30a and the lower diaphragm 30b, respectively.

[0242] Specifically, as shown in Figure 1, the diaphragm tightening device 100 for conveying the upper diaphragm 30a includes 16 tension rollers arranged sequentially along the conveying direction of the upper diaphragm 30a (as indicated by the hollow arrow in Figure 1). The 1st, 4th, 7th, 12th and 16th tension rollers are the first rollers 10a, and the remaining tension rollers are the second rollers 10b.

[0243] As shown in Figure 2, the diaphragm tightening device 100 for conveying the lower diaphragm 30b includes 18 tension rollers arranged sequentially along the conveying direction of the lower diaphragm 30b (as indicated by the hollow arrow in Figure 1). Among them, the 1st, 5th, 10th, 13th, 16th and 18th tension rollers are all first rollers 10a, and the remaining tension rollers are all second rollers 10b.

[0244] As shown in Figure 4, a plurality of grooves are formed on the first roller 10a. The plurality of grooves extend spirally from one end to the other end in the axial direction of the first roller 10a. A first rib 101 is defined between adjacent grooves and extends spirally in the axial direction of the first roller 10a. The plurality of first ribs 101 are arranged in parallel and extend from one end edge to the other end edge in the axial direction of the first roller 10a.

[0245] Furthermore, in the axial direction of the first roller 10a, the distance d2 between two adjacent first ribs 101 is 10mm-20mm, the angle α between the first rib 101 and the central axis of the first roller 10a is 50°-80°, the height H1 of the first rib 101 in the radial direction of the first roller 10a is 3mm-6mm, and the thickness H2 of the first rib 101 perpendicular to the extension direction is 3mm-6mm.

[0246] As shown in Figure 5, the second roller 10b is a smooth roller.

[0247] Example 2,

[0248] As shown in Figure 2, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that in Embodiment 1, the first rib 101 of the first roller 10a extends unidirectionally spirally from one end of the first roller 10a to the other end, while in this Embodiment 2, the first roller 10a includes a first segment 102 and a second segment 103 connected axially. The first segment 102 is provided with a plurality of spirally extending and parallel first ribs 101, and the second segment 103 is also provided with a plurality of spirally extending and parallel first ribs 101. The plurality of first ribs 101 on the first segment 102 and the plurality of first ribs 101 on the second segment 103 are symmetrically arranged and connected one-to-one.

[0249] Furthermore, in the axial direction of the first roller 10a, the distance d3 between two adjacent first ribs 101 on the first section 102 is 10mm-20mm, the angle α between the first rib 101 on the first section 102 and the central axis of the first roller 10a is 50°-80°, the height H1 of the first rib 101 on the first section 102 in the radial direction of the first roller 10a is 3mm-6mm, and the thickness H2 of the first rib 101 on the first section 102 perpendicular to the extension direction is 3mm-6mm.

[0250] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A diaphragm tightening device (100), characterized in that, The plurality of tension rollers are arranged sequentially along the conveying direction of the diaphragm (30), and the plurality of tension rollers include: The first roller (10a) has at least three tension rollers, and the tension rollers located at the upstream and downstream ends in the conveying direction are all formed as the first roller (10a). The first roller (10a) has a first rib (101) formed on its circumferential surface. The first rib (101) extends obliquely along the circumferential direction of the first roller (10a) in the direction from one end of the first roller (10a) to the other end in the axial direction. The second roller (10b) has a smooth circumferential surface.

2. The diaphragm tightening device (100) according to claim 1, characterized in that, The ratio of the number of the first roller (10a) to the total number of the tension rollers is greater than or equal to 30% and less than or equal to 50%.

3. The diaphragm tightening device (100) according to claim 1 or 2, characterized in that, The total number of tension rollers is N. Along the conveying direction, at least one of the first rollers (10a) is disposed between the m-th tension roller and the n-th tension roller, where m is the largest positive integer less than or equal to N / 3 and n is the smallest positive integer greater than or equal to 2N / 3.

4. The diaphragm tightening device (100) according to any one of claims 1-3, characterized in that, Two or three of the plurality of first rollers (10a) are arranged continuously along the conveying direction.

5. The diaphragm tightening device (100) according to claim 4, characterized in that, The total number of tension rollers is N. Along the conveying direction, the (N-1)th tension roller and the Nth tension roller are both the first roller (10a), and the (N-2)th tension roller is the second roller (10b).

6. The diaphragm tightening device (100) according to any one of claims 1-5, characterized in that, Along the conveying direction, one or more second rollers (10b) are provided between at least one set of two adjacent first rollers (10a).

7. The diaphragm tightening device (100) according to claim 6, characterized in that, Along the conveying direction, the number of second rollers (10b) between any two adjacent sets of first rollers (10a) is greater than or equal to 1 and less than or equal to 4.

8. The diaphragm tightening device (100) according to any one of claims 1-7, characterized in that, In the direction from one end of the first roller (10a) toward the other end in the axial direction, the first ribs (101) on the plurality of first rollers (10a) extend in the same direction in the circumferential direction of the first roller (10a).

9. The diaphragm tightening device (100) according to any one of claims 1-8, characterized in that, The diaphragm tightening device (100) is configured to convey a diaphragm (30) with a thickness greater than or equal to 5 μm and less than or equal to 10 μm.

10. The diaphragm tightening device (100) according to claim 9, characterized in that, The diaphragm tightening device (100) is configured to convey a diaphragm (30) with a thickness greater than or equal to 5 μm and less than or equal to 8 μm.

11. The diaphragm tightening device (100) according to any one of claims 1-10, characterized in that, The first rib (101) extends spirally in the direction from one end of the first roller (10a) toward the other end in the axial direction.

12. The diaphragm tightening device (100) according to claim 11, characterized in that, The number of first ribs (101) on at least one first roller (10a) is one, and the pitch of the first rib (101) extending spirally is greater than or equal to 5 mm and less than or equal to 50 mm.

13. The diaphragm tightening device (100) according to claim 12, characterized in that, The pitch of the first rib (101) spiral extension is greater than or equal to 10 mm and less than or equal to 20 mm.

14. The diaphragm tightening device (100) according to claim 11, characterized in that, The number of first ribs (101) on at least one first roller (10a) is multiple, and the multiple first ribs (101) on the first roller have the same spiral extension direction. In the axial direction of the first roller (10a), the distance between two adjacent first ribs (101) is greater than or equal to 5 mm and less than or equal to 50 mm.

15. The diaphragm tightening device (100) according to claim 14, characterized in that, In the axial direction of the first roller (10a), the distance between two adjacent first ribs (101) is greater than or equal to 10 mm and less than or equal to 20 mm.

16. The diaphragm tightening device (100) according to claim 1, characterized in that, The first roller (10a) includes a first section (102) and a second section (103) connected axially. The first roller (10a) has a plurality of first ribs (101), which are respectively formed on the first section (102) and the second section (103). In the axial direction of the first roller (10a), the first rib (101) on the first segment (102) and the first rib (101) on the second segment (103) both extend spirally along the circumferential direction of the first roller (10a), and the spiral extension directions of the first rib (101) on the first segment (102) and the first rib (101) on the second segment (103) are opposite.

17. The diaphragm tightening device (100) according to claim 16, characterized in that, The first reinforcing bar (101) on the first segment (102) and the first reinforcing bar (101) on the second segment (103) are arranged symmetrically about the vertical plane of the first line segment. Wherein, the first line segment is parallel to the central axis of the first roller, and on the axial direction of the first roller, one end of the first line segment is flush with the end of the first rib on the first segment that is opposite to the second segment, and the other end of the first line segment is flush with the end of the first rib on the second segment that is opposite to the first segment.

18. The diaphragm tightening device (100) according to claim 16 or 17, characterized in that, The first rib (101) on the first segment (102) is connected to the first rib (101) on the second segment (103).

19. The diaphragm tightening device (100) according to any one of claims 1-18, characterized in that, The angle between the first rib (101) and the central axis of the first roller (10a) is greater than or equal to 50° and less than or equal to 80°.

20. The diaphragm tightening device (100) according to any one of claims 1-19, characterized in that, The ratio of the length of the first rib (101) in the axial direction of the first roller (10a) to the length of the first roller (10a) is greater than or equal to 0.5 and less than or equal to 1.

21. The diaphragm tightening device (100) according to any one of claims 1-20, characterized in that, The first rib (101) is a raised rib formed on the circumferential surface of the first roller (10a) and protruding outward in the radial direction.

22. The diaphragm tightening device (100) according to any one of claims 1-21, characterized in that, The surface of the first roller (10a) is formed with recessed grooves, which extend obliquely toward the circumference of the first roller (10a) in a direction from one end of the first roller (10a) to the other end in the axial direction. Wherein, the number of the grooves is one, and the first rib (101) is formed between two adjacent groove segments in the axial direction of the groove; or, the number of the grooves is multiple, and the first rib (101) is formed between two adjacent grooves in the axial direction of the groove.

23. The diaphragm tightening device (100) according to any one of claims 1-22, characterized in that, In the radial direction of the first roller (10a), the height of the first rib (101) is greater than or equal to 1 mm and less than or equal to 10 mm.

24. The diaphragm tightening device (100) according to claim 23, characterized in that, In the radial direction of the first roller (10a), the height of the first rib (101) is greater than or equal to 3 mm and less than or equal to 6 mm.

25. The diaphragm tightening device (100) according to any one of claims 1-24, characterized in that, In a direction perpendicular to the extension direction of the first rib (101), the thickness of the first rib (101) is greater than or equal to 1 mm and less than or equal to 10 mm.

26. The diaphragm tightening device (100) according to claim 25, characterized in that, In a direction perpendicular to the extension direction of the first rib (101), the thickness of the first rib (101) is greater than or equal to 3 mm and less than or equal to 6 mm.

27. A winding device (1A), characterized in that, The winding device (1A) is used to wind an electrode assembly (300), the electrode assembly (300) including an electrode sheet and a diaphragm, and the winding device (1A) includes a diaphragm tightening device (100) according to any one of claims 1-26, the diaphragm tightening device (100) being used to transport the diaphragm.

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