Winding device and battery production line

Abstract

The utility model provides a winding device and a battery production line. The winding device comprises a pole piece unwinding mechanism, a winding mechanism, a pole piece processing mechanism and a caching mechanism, the pole piece unwinding mechanism is used for providing pole pieces, the winding mechanism is used for winding the pole pieces, the pole piece processing mechanism is arranged between the pole piece unwinding mechanism and the winding mechanism in the conveying direction of the pole pieces, and the pole piece processing mechanism is used for processing the pole pieces. The temporary storage mechanism is arranged between the pole piece processing mechanism and the winding mechanism in the conveying direction of the pole pieces and used for temporary storage of the pole pieces. Wherein the temporary storage mechanism comprises a first driving roller and a first pressing roller, the first pressing roller is used for pressing the pole piece on the first driving roller in an abutting mode, the first driving roller comprises a first feeding end and a first discharging end, and in the rotating direction of the first driving roller, the first pressing roller is located between the first feeding end and the first discharging end, and the first pressing roller and the first feeding end are spaced. According to the invention, the risk of wrinkling of the electrode plate in the preparation process of the electrode assembly can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a winding device and a battery production line. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] During the preparation of electrode assemblies, if the electrode sheets are wrinkled, it will directly affect the product yield of the electrode assemblies, and further affect the economic benefits of the battery. Therefore, how to effectively reduce the risk of wrinkles on the electrode sheets during the preparation of electrode assemblies is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a winding device and a battery production line, which can effectively reduce the risk of wrinkles on the electrode sheets during the preparation of the electrode assembly.

[0005] In a first aspect, an embodiment of the present application provides a winding device, which includes a pole piece unwinding mechanism, a winding mechanism, a pole piece processing mechanism and a cache mechanism, wherein the pole piece unwinding mechanism is used to provide pole pieces, the winding mechanism is used to wind the pole pieces, the pole piece processing mechanism is arranged between the pole piece unwinding mechanism and the winding mechanism along the conveying direction of the pole pieces, and the pole piece processing mechanism is used to process the pole pieces. The cache mechanism is arranged between the pole piece processing mechanism and the winding mechanism along the conveying direction of the pole pieces, and the cache mechanism is used to cache the pole pieces. Among them, the cache mechanism includes a first driving roller and a first pressing roller, the first pressing roller is used to press the pole piece against the first driving roller, the first driving roller includes a first feeding end and a first discharging end, and in the rotation direction of the first driving roller, the first pressing roller is located between the first feeding end and the first discharging end and is spaced apart from the first feeding end.

[0006] The above technical solution arranges the first pressing roller between the first feeding end and the first discharging end along the rotation direction of the first driving roller and is spaced from the first feeding end. When the first driving roller is started, the electrode sheet with wrinkles will first pass through a section of the surface of the first driving roller, so that the electrode sheet will be subjected to the tension from the first driving roller, and the wrinkles of the electrode sheet will be flattened under the action of the tension. Then, the flattened electrode sheet will pass through the first pressing roller again and then leave the first driving roller from the first discharging end. In this way, the risk of wrinkles on the electrode sheet during the preparation of the electrode assembly can be effectively reduced.

[0007] In some embodiments of the first aspect, in the rotation direction of the first driving roller, the distance between the first pressing roller and the first discharging end is smaller than the distance between the first pressing roller and the first feeding end.

[0008] When the first driving roller is started, the moving distance of the wrinkled pole piece on the surface of the first driving roller before passing through the first pressing roller can be further increased, so that the tension of the pole piece from the first driving roller can be further increased, thereby further improving the flattening effect of the first driving roller on the pole piece. In this way, the risk of wrinkles on the pole piece during the preparation of the electrode assembly can be further reduced.

[0009] In some embodiments of the first aspect, the cache mechanism includes a plurality of transmission rollers located downstream of the first drive roller, the plurality of transmission rollers are arranged between the first drive roller and the winding device along the conveying direction of the pole piece, and at least one transmission roller is capable of moving relative to the first drive roller.

[0010] The above technical solution can improve the structural compactness and setting flexibility of the cache mechanism by providing multiple transmission rollers.

[0011] In some embodiments of the first aspect, each driving roller is capable of moving in a direction perpendicular to a horizontal plane.

[0012] On the one hand, each transmission roller can move relative to the first drive roller, so that the efficiency of the cache mechanism in releasing the pole piece when the first drive roller stops rotating and the efficiency of caching the pole piece when the first drive roller starts rotating are improved, thereby improving the working efficiency of the cache mechanism; on the other hand, each transmission roller moves in a direction perpendicular to the horizontal plane, which is conducive to reducing the difficulty of the overall layout of the cache mechanism.

[0013] In some embodiments of the first aspect, at least two adjacent driving rollers along the conveying direction of the pole piece are staggered in a direction perpendicular to the horizontal plane.

[0014] The above technical solution is conducive to reducing the risk of interference between the pole pieces cached by the cache mechanism in a direction perpendicular to the horizontal plane, thereby improving the reliability of the winding device.

[0015] In some embodiments of the first aspect, the cache mechanism further includes a second drive roller and a second pressure roller, the second drive roller being located downstream of the plurality of transmission rollers. The second pressure roller is used to press the pole piece against the second drive roller, the second drive roller includes a second feed end and a second discharge end, and in the rotation direction of the second drive roller, the second pressure roller is located between the second feed end and the second discharge end and is spaced from the second feed end.

[0016] The above technical solution provides a second driving roller, which can cooperate with the first driving roller to drive the pole piece for transportation. This can not only improve the overall transportation efficiency of the pole piece to improve the production efficiency of the winding device, but also enable the cache mechanism to apply driving force to the pole piece at both ends of the pole piece transportation direction to improve the overall force uniformity during the pole piece transportation process and reduce the risk of pole piece breakage.

[0017] In some embodiments of the first aspect, a length of the first pressure roller is smaller than a length of the first driving roller.

[0018] Setting the length of the first pressing roller to be smaller than the length of the first driving roller can reduce the pressure of the first pressing roller on the empty foil area to a certain extent, thereby further reducing the risk of wrinkles on the pole piece during the preparation of the electrode assembly.

[0019] In some embodiments of the first aspect, a length L of the first pressing roller satisfies the relationship: 50 mm≤L≤300 mm.

[0020] The above technical solution can reduce the risk of relative sliding between the pole piece and the first driving roller while reducing the risk of the first pressing roller pressing the empty foil area of ​​the pole piece by setting the length L of the first pressing roller within the above range, thereby effectively improving the product yield.

[0021] In some embodiments of the first aspect, a diameter D of the first pressing roller satisfies the relationship: 10 mm≤D≤150 mm.

[0022] The above technical solution can reduce the risk of relative sliding between the pole piece and the first driving roller while reducing the space occupancy rate of the first pressing roller by setting the diameter D of the first pressing roller within the above range.

[0023] In some embodiments of the first aspect, the first pressing roller includes a roller body and a buffer layer, the buffer layer is disposed on the surface of the roller body, and the stiffness of the buffer layer is smaller than the stiffness of the roller body.

[0024] The above technical solution arranges a buffer layer, and the stiffness of the buffer layer is smaller than the stiffness of the roller body. On the one hand, the smaller stiffness of the buffer layer makes the texture of the buffer layer softer, thereby reducing the risk of damaging the pole piece when the first pressure roller is in direct contact with the pole piece; on the other hand, the higher stiffness of the roller body can improve the connection firmness between the first pressure roller and the external driving component, thereby improving the reliability of the cache mechanism.

[0025] In some embodiments of the first aspect, the pole piece processing mechanism includes a gluing mechanism, and the gluing mechanism is used to glue the pole piece.

[0026] The gluing mechanism can apply protective glue to both sides of the part of the pole piece to be glued before the pole piece is wound. The part to be glued is the corner of the innermost circle of the pole piece after winding, so that the corner of the pole piece after winding can be protected during the pressure process to reduce the risk of cracking.

[0027] In some embodiments of the first aspect, the winding device further includes a diaphragm unwinding mechanism, the diaphragm unwinding mechanism is used to provide the diaphragm, and the winding mechanism is used to wind the pole piece and the diaphragm.

[0028] In a second aspect, the present application provides a battery production line, which includes a winding device provided by any embodiment of the first aspect.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of the layout of a winding device provided in some embodiments of the present application;

[0032] Figure 2 A schematic side structural diagram of a first pressing roller of a winding device provided in some embodiments of the present application;

[0033] Figure 3 A schematic front view of the structure of a first pressing roller of a winding device provided in some embodiments of the present application;

[0034] Figure 4 A schematic side structural diagram of a first pressing roller of another winding device provided in some embodiments of the present application;

[0035] Figure 5 A schematic structural diagram of an electrode assembly provided in some embodiments of the present application.

[0036] The reference numerals in the specific implementation manner are as follows:

[0037] 100, pole piece; 200, protective glue; 300, horizontal surface;

[0038] 10. Pole piece unwinding mechanism; 20. Winding mechanism; 30. Pole piece processing mechanism; 31. Gluing mechanism; 311. First gluing assembly; 312. Second gluing assembly; 40. Buffer mechanism; 41. First driving roller; 411. First feeding end; 412. First discharging end; 42. First pressing roller; 421. Roller body; 422. Buffer layer; 43. Transmission roller; 44. Second driving roller; 441. Second feeding end; 442. Second discharging end; 45. Second pressing roller. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0041] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0044] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0045] The term "plurality" used in the present application refers to two or more (including two).

[0046] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0047] With the development of battery technology, battery cells are used in more and more fields and are gradually replacing traditional petrochemical energy in the field of automotive power. Battery cells can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable battery cells, the active material can be activated by charging after discharge and continue to be used.

[0048] The battery cell can be but is not limited to a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and the embodiments of the present application are not limited to this.

[0049] As an example, the battery cell may be, but is not limited to, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0050] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0051] In some embodiments, the battery may be a battery pack, which includes a battery case and battery cells, wherein the battery cells or battery modules are accommodated in the battery case.

[0052] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0053] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0054] During the preparation process of the electrode assembly, if wrinkles occur on the electrode sheet, it will directly affect the product yield of the electrode assembly, and further affect the economic benefits of the battery.

[0055] The current winding device is usually configured to process the pole piece by a pole piece processing mechanism. For example, the pole piece processing mechanism can be a gluing mechanism for gluing the pole piece, and the pole piece processing mechanism can also be a cutting mechanism for cutting the pole piece, and then the pole piece and / or the diaphragm are wound by the winding mechanism. Since the pole piece needs to be kept still during the process of the pole piece processing mechanism processing the pole piece, but in order to ensure that the overall production efficiency is not affected, a cache mechanism is usually added between the pole piece processing mechanism and the winding mechanism to cache the pole piece, so that the pole piece processing mechanism and the winding mechanism can work at the same time, reducing the impact on the overall production efficiency.

[0056] However, since the driving roller of the cache mechanism needs to be started and stopped frequently, when the driving roller of the cache mechanism stops, the tension of the pole piece between the cache mechanism and the pole piece processing mechanism will be reduced to a certain extent, which will easily cause wrinkles in the pole piece, especially in the empty foil area of ​​the pole piece without coating. The pressing roller of the cache mechanism used to press the pole piece against the driving roller is set on the feeding side of the driving roller. When the driving roller of the cache mechanism starts, the wrinkled pole piece will pass through the pressing roller, and the pressing roller will compact the wrinkles on the pole piece, resulting in irreversible wrinkles in the pole piece.

[0057] Based on the above considerations, an embodiment of the present application provides a winding device, which includes a pole piece unwinding mechanism, a winding mechanism, a pole piece processing mechanism and a cache mechanism. The pole piece unwinding mechanism is used to provide pole pieces, the winding mechanism is used to wind the pole pieces, the pole piece processing mechanism is arranged between the pole piece unwinding mechanism and the winding mechanism along the conveying direction of the pole pieces, and the pole piece processing mechanism is used to process the pole pieces. The cache mechanism is arranged between the pole piece processing mechanism and the winding mechanism along the conveying direction of the pole pieces, and the cache mechanism is used to cache the pole pieces. Among them, the cache mechanism includes a first driving roller and a first pressing roller, the first pressing roller is used to press the pole piece against the first driving roller, the first driving roller includes a first feeding end and a first discharging end, and in the rotation direction of the first driving roller, the first pressing roller is located between the first feeding end and the first discharging end and is spaced from the first feeding end.

[0058] Since the first pressure roller is located between the first feed end and the first discharge end and is spaced from the first feed end in the direction of rotation of the first driving roller, when the first driving roller is started, the electrode sheet with wrinkles will first pass through a section of the surface of the first driving roller, so that the electrode sheet will be subjected to the tension from the first driving roller, and the wrinkles of the electrode sheet will be flattened under the action of the tension, and then the flattened electrode sheet will pass through the first pressure roller again, and then leave the first driving roller from the first discharge end. In this way, the above technical solution can effectively reduce the risk of wrinkles on the electrode sheet during the preparation of the electrode assembly.

[0059] Figure 1 A schematic diagram of the layout of a winding device provided in some embodiments of the present application.

[0060] like Figure 1 As shown, the embodiment of the present application provides a winding device, which includes a pole piece unwinding mechanism 10, a winding mechanism 20, a pole piece processing mechanism 30 and a cache mechanism 40. The pole piece unwinding mechanism 10 is used to provide a pole piece 100, the winding mechanism 20 is used to wind the pole piece 100, the pole piece processing mechanism 30 is arranged between the pole piece unwinding mechanism 10 and the winding mechanism 20 along the conveying direction of the pole piece 100, and the pole piece processing mechanism 30 is used to process the pole piece 100. The cache mechanism 40 is arranged between the pole piece processing mechanism 30 and the winding mechanism 20 along the conveying direction of the pole piece 100, and the cache mechanism 40 is used to cache the pole piece 100. Among them, the cache mechanism 40 includes a first driving roller 41 and a first pressing roller 42. The first pressing roller 42 is used to press the pole piece 100 against the first driving roller 41. The first driving roller 41 includes a first feed end 411 and a first discharge end 412. In the rotation direction of the first driving roller 41, the first pressing roller 42 is located between the first feed end 411 and the first discharge end 412 and is spaced apart from the first feed end 411.

[0061] Exemplarily, the pole piece unwinding mechanism 10 is used to provide the pole piece 100, and the pole piece 100 is wound on the reel of the pole piece unwinding mechanism 10, and the pole piece 100 is unwound as the reel rotates. The winding mechanism 20 is used to wind the pole piece 100 to form an electrode assembly. The pole piece processing mechanism 30 is used to process the pole piece 100, for example, the pole piece processing mechanism 30 can be a gluing mechanism 31 for gluing the pole piece 100, and the pole piece processing mechanism 30 can also be a cutting mechanism for cutting the pole piece 100, and so on.

[0062] Since the pole piece 100 needs to be kept still during the processing of the pole piece 100 by the pole piece processing mechanism 30, but in order to ensure that the overall production efficiency is not affected, a cache mechanism 40 is set between the pole piece processing mechanism 30 and the winding mechanism 20 to cache the pole piece 100, which can enable the pole piece processing mechanism 30 and the winding mechanism 20 to work simultaneously and reduce the impact on the overall production efficiency.

[0063] The first driving roller 41 of the cache mechanism 40 is used to drive the pole piece 100 for transportation, and the first pressing roller 42 is used to press the pole piece 100 against the first driving roller 41 to reduce the risk of relative sliding between the pole piece 100 and the first driving roller 41 during the process of the first driving roller 41 driving the pole piece 100, thereby improving the stability of the transportation of the pole piece 100.

[0064] Furthermore, since the processing position of the pole piece processing mechanism 30 located upstream of the buffer mechanism 40 on the pole piece 100 is relatively accurate, the relative sliding between the pole piece 100 and the first driving roller 41 will also cause the processing position of the pole piece processing mechanism 30 to be offset, thereby affecting the product yield. Therefore, by providing the first pressing roller 42 to reduce the risk of relative sliding between the pole piece 100 and the first driving roller 41 during the process of the first driving roller 41 driving the pole piece 100, the overall product yield of the winding device can also be improved.

[0065] As an example, the buffer mechanism 40 may include a plurality of rollers, which are arranged between the pole piece processing mechanism 30 and the winding device along the conveying direction of the pole piece 100, the plurality of rollers are arranged at intervals, at least one of the plurality of rollers can move relative to the other rollers, and the pole piece 100 passes through each roller in turn, wherein at least one of the plurality of rollers is configured as the first driving roller 41. Optionally, the projection positions of the plurality of rollers on the same horizontal plane are distributed in a left-right staggered manner, and the pole piece 100 passes through each roller in turn to form a waveform propagating in the horizontal direction.

[0066] Specifically, when the pole piece processing mechanism 30 processes the pole piece 100, the first driving roller 41 of the cache mechanism 40 stops rotating, and at least one of the multiple rollers moves in a direction approaching each other relative to the other rollers to release the cached pole piece 100 for winding by the winding mechanism 20; when the pole piece processing mechanism 30 completes the processing of the pole piece 100, the first driving roller 41 of the cache mechanism 40 starts to rotate to drive the pole piece 100 of the entire conveyor line for conveyance, and at the same time, at least one of the multiple rollers moves in a direction away from each other relative to the other rollers to cache the pole piece 100, so as to provide the pole piece 100 for the winding mechanism 20 when the first driving roller 41 stops rotating next time.

[0067] As another example, the cache mechanism 40 may include an adjustable roller, the roller diameter of which can be adjusted, and when the roller diameter increases, the pole piece 100 can be cached when the first drive roller 41 rotates, and when the roller diameter decreases, the pole piece 100 can be provided to the winding mechanism 20 when the first drive roller 41 stops rotating. The specific structural form of the cache mechanism 40 can be selected according to the actual application environment.

[0068] Exemplarily, the first driving roller 41 includes a roller body and a driving motor, the driving motor is connected to the roller body for driving the roller body to rotate. Optionally, the first driving roller 41 may also include a moving component, the moving component is connected to the roller body for driving the roller body to move relative to the first pressing roller 42.

[0069] As an example, the winding device further includes a driving mechanism, which is connected to the first pressing roller 42 to drive the first pressing roller 42 to move relative to the first driving roller 41. When the first driving roller 41 is required to drive and transport the pole piece 100, the driving mechanism drives the first pressing roller 42 to move in a direction close to the first driving roller 41, so that the first pressing roller 42 presses the pole piece 100 against the first driving roller 41; when the pole piece 100 needs to be adjusted or the buffer mechanism 40 needs to be adjusted, the driving mechanism drives the first pressing roller 42 to move in a direction away from the first driving roller 41, and the pressure on the pole piece 100 is contacted to provide conditions for the corresponding adjustment work.

[0070] The first feed end 411 of the first driving roller 41 refers to the position where the pole piece 100 first contacts the surface of the first driving roller 41 when passing through the first driving roller 41, and the first discharge end 412 of the first driving roller 41 refers to the position where the pole piece 100 first separates from the surface of the first driving roller 41 after passing through the first driving roller 41. In other words, the first feed end 411 and the first discharge end 412 are respectively the two ends of the portion of the first driving roller 41 that contacts the pole piece 100 along the rotation direction of the first driving roller 41.

[0071] It is understandable that the first driving roller 41 of the cache mechanism 40 needs to be frequently started and stopped. When the first driving roller 41 of the cache mechanism 40 stops, the tension of the pole piece 100 between the cache mechanism 40 and the pole piece processing mechanism 30 will be reduced to a certain extent, which will easily cause wrinkles in the pole piece 100, especially in the empty foil area of ​​the pole piece 100 without coating. When the first driving roller 41 of the cache mechanism 40 is started, if the wrinkled pole piece 100 directly passes through the first pressing roller 42, the first pressing roller 42 will compact the wrinkles on the pole piece 100, resulting in irreversible wrinkles in the pole piece 100, thereby affecting product quality.

[0072] Thus, the above technical solution arranges the first pressing roller 42 between the first feeding end 411 and the first discharging end 412 along the rotation direction of the first driving roller 41 and is spaced from the first feeding end 411. When the first driving roller 41 is started, the electrode sheet 100 with wrinkles will first pass through a section of the surface of the first driving roller 41, so that the electrode sheet 100 will be subjected to the tension from the first driving roller 41, and the wrinkles of the electrode sheet 100 will be flattened under the action of the tension. Then, the flattened electrode sheet 100 will pass through the first pressing roller 42 again, and then leave the first driving roller 41 from the first discharging end 412. In this way, the risk of wrinkles on the electrode sheet 100 during the preparation of the electrode assembly can be effectively reduced.

[0073] In some embodiments, in the rotation direction of the first driving roller 41 , the distance between the first pressing roller 42 and the first discharging end 412 is smaller than the distance between the first pressing roller 42 and the first feeding end 411 .

[0074] When the first driving roller 41 is started, the moving distance of the wrinkled pole piece 100 on the surface of the first driving roller 41 before passing through the first pressing roller 42 can be further increased, so that the tension of the pole piece 100 from the first driving roller 41 can be further increased, thereby further improving the flattening effect of the first driving roller 41 on the pole piece 100. In this way, the risk of wrinkles on the pole piece 100 during the preparation of the electrode assembly can be further reduced.

[0075] In some embodiments, the cache mechanism 40 includes multiple transmission rollers 43 located downstream of the first drive roller 41, and the multiple transmission rollers 43 are arranged between the first drive roller 41 and the winding device along the conveying direction of the pole piece 100, and at least one transmission roller 43 can move relative to the first drive roller 41.

[0076] Exemplarily, a plurality of drive rollers 43 are arranged between the first drive roller 41 and the winding device along the conveying direction of the pole piece 100, the plurality of drive rollers 43 are arranged at intervals, at least one drive roller 43 is movable relative to the first drive roller 41, and the pole piece 100 passes through the first drive roller 41 and each drive roller 43 in sequence. The pole piece 100 located between the first drive roller 41 and each drive roller 43 is the pole piece 100 cached by the cache mechanism 40.

[0077] Specifically, when the pole piece processing mechanism 30 processes the pole piece 100, the first drive roller 41 stops rotating, and at least one transmission roller 43 moves in a direction close to the first drive roller 41 to release the cached pole piece 100 for winding by the winding mechanism 20; when the pole piece processing mechanism 30 completes the processing of the pole piece 100, the first drive roller 41 starts to rotate to drive the pole piece 100 of the entire conveyor line for conveyance, and at the same time, at least one transmission roller 43 moves in a direction close to the first drive roller 41 to cache the pole piece 100, so as to provide the pole piece 100 for the winding mechanism 20 when the first drive roller 41 stops rotating next time.

[0078] Optionally, the number of the transmission rollers 43 may be two, three, four, five or more, which may be selected according to the actual application environment.

[0079] As an example, the cache mechanism 40 includes five transmission rollers 43, and the five transmission rollers 43 are configured as two first transmission rollers and three second transmission rollers, the two first transmission rollers are arranged with intervals from the first drive roller in the horizontal direction, the three second transmission rollers are arranged with intervals from the two first transmission rollers in the direction perpendicular to the horizontal plane 300, and the three second transmission rollers are arranged with intervals from each other in the horizontal direction. The two first transmission rollers are fixedly arranged, and the three second transmission rollers can be moved in the direction perpendicular to the horizontal plane 300.

[0080] It can be understood that, when the overall pole piece 100 caching capacity of the caching mechanism 40 is certain, a plurality of drive rollers 43 cooperate with the first drive roller 41 to cache the pole piece 100, compared with a single drive roller 43 cooperating with the first drive roller 41 to cache the pole piece 100, the former has higher structural compactness and space utilization flexibility. For example, when one transmission roller 43 cooperates with the first drive roller 41 to cache the pole piece 100, the overall pole piece 100 caching capacity of the cache mechanism 40 can only be increased by increasing the distance between the transmission roller 43 and the first drive roller 41; and when multiple transmission rollers 43 cooperate with the first drive roller 41 to cache the pole piece 100, not only can the overall pole piece 100 caching capacity of the cache mechanism 40 be increased by increasing the distance between two adjacent transmission rollers 43 along the conveying direction of the pole piece 100, but the overall pole piece 100 caching capacity of the cache mechanism 40 can also be increased by the relative positions of the multiple transmission rollers 43. For example, the projection positions of the multiple transmission rollers 43 on the same horizontal plane are distributed in a left-right staggered manner, and the pole piece 100 passes through each transmission roller 43 in turn to form a waveform propagating in the horizontal direction.

[0081] In this way, the above technical solution can improve the structural compactness and setting flexibility of the cache mechanism 40 by providing a plurality of transmission rollers 43 .

[0082] In some embodiments, each driving roller 43 can move in a direction perpendicular to the horizontal plane 300 .

[0083] On the one hand, each transmission roller 43 can move relative to the first drive roller 41, so that the efficiency of the cache mechanism 40 in releasing the pole piece 100 when the first drive roller 41 stops rotating and the efficiency of caching the pole piece 100 when the first drive roller 41 starts rotating are improved, thereby improving the working efficiency of the cache mechanism 40; on the other hand, each transmission roller 43 moves in a direction perpendicular to the horizontal plane 300, which is conducive to reducing the difficulty of the overall layout of the cache mechanism 40.

[0084] In some embodiments, at least two adjacent driving rollers 43 along the conveying direction of the pole piece 100 are staggered in a direction perpendicular to the horizontal plane 300 .

[0085] It is understandable that the pole piece 100, under the action of gravity, has a tendency to move toward the ground in a direction perpendicular to the horizontal plane 300. Thus, the above technical solution is conducive to reducing the risk of interference of the pole piece 100 cached by the cache mechanism 40 in a direction perpendicular to the horizontal plane 300, thereby improving the reliability of the winding device.

[0086] As an example, every two adjacent driving rollers 43 along the conveying direction of the pole piece 100 are staggered in a direction perpendicular to the horizontal plane 300 .

[0087] In some embodiments, the cache mechanism 40 further includes a second drive roller 44 and a second pressure roller 45, and the second drive roller 44 is located downstream of the plurality of transmission rollers 43. The second pressure roller 45 is used to press the pole piece 100 against the second drive roller 44, and the second drive roller 44 includes a second feed end 441 and a second discharge end 442. In the rotation direction of the second drive roller 44, the second pressure roller 45 is located between the second feed end 441 and the second discharge end 442 and is spaced from the second feed end 441.

[0088] The second driving roller 44 can cooperate with the first driving roller 41 to drive the pole piece 100 for transportation. The second pressing roller 45 is used to press the pole piece 100 against the second driving roller 44 to reduce the risk of relative sliding between the pole piece 100 and the second driving roller 44 during the process of the second driving roller 44 driving the pole piece 100, thereby improving the stability of the transportation of the pole piece 100.

[0089] Exemplarily, the second driving roller 44 includes a roller body and a driving motor, the driving motor is connected to the roller body for driving the roller body to rotate. Optionally, the second driving roller 44 may also include a moving component, the moving component is connected to the roller body for driving the roller body to move relative to the second pressing roller 45.

[0090] The second feed end 441 of the second drive roller 44 refers to the position where the pole piece 100 first contacts the surface of the second drive roller 44 when passing through the second drive roller 44, and the second discharge end 442 of the second drive roller 44 refers to the position where the pole piece 100 first separates from the surface of the second drive roller 44 after passing through the second drive roller 44. In other words, the second feed end 441 and the second discharge end 442 are respectively the two ends of the portion of the second drive roller 44 that contacts the pole piece 100 along the rotation direction of the second drive roller 44.

[0091] The principle of the arrangement of the second driving roller 44 and the second pressing roller 45 is the same as the principle of the arrangement of the first driving roller 41 and the first pressing roller 42 mentioned above, which will not be repeated here. It can effectively reduce the risk of wrinkles on the electrode sheet 100 during the preparation of the electrode assembly.

[0092] The above technical solution provides a second driving roller 44, which can cooperate with the first driving roller 41 to drive the pole piece 100 for transportation. This can not only improve the overall transportation efficiency of the pole piece 100 to improve the production efficiency of the winding device, but also enable the cache mechanism 40 to apply driving force to the pole piece 100 at both ends in the transportation direction of the pole piece 100, so as to improve the overall force uniformity of the pole piece 100 during transportation and reduce the risk of breakage of the pole piece 100.

[0093] It should be noted that the second driving roller 44 may have the same structure as the first driving roller 41 , and the second pressing roller 45 may have the same structure as the first pressing roller 42 , which will not be described in detail herein.

[0094] In some embodiments, the length of the first pressing roller 42 is smaller than the length of the first driving roller 41 .

[0095] It is understandable that the pole piece 100 includes a coated area coated with a coating and an empty foil area without a coating, and during the transportation of the pole piece 100, wrinkles are mainly generated in the empty foil area of ​​the pole piece 100. In this way, setting the length of the first pressing roller 42 to be smaller than the length of the first driving roller 41 can reduce the pressure of the first pressing roller 42 on the empty foil area to a certain extent, thereby further reducing the risk of wrinkles in the pole piece 100 during the preparation of the electrode assembly.

[0096] Figure 2 This is a schematic side view of the first pressing roller 42 of a winding device provided in some embodiments of the present application. Figure 3 This is a schematic diagram of the front view structure of a first pressure roller 42 of a winding device provided in some embodiments of the present application.

[0097] Continue to refer Figures 2 to 3 In some embodiments, the length L of the first pressing roller 42 satisfies the relationship: 50 mm ≤ L ≤ 300 mm.

[0098] As an example, the length L of the first pressing roller 42 can be but is not limited to 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 120 mm, 140 mm, 160 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, 300 mm, etc.

[0099] It can be understood that the longer the length L of the first pressing roller 42 is, the larger the contact area between the first pressing roller 42 and the pole piece 100 is, and the greater the risk of the first pressing roller 42 pressing the empty foil area of ​​the pole piece 100 is; the shorter the length L of the first pressing roller 42 is, the smaller the contact area between the first pressing roller 42 and the pole piece 100 is, and the smaller the risk of the first pressing roller 42 pressing the empty foil area of ​​the pole piece 100 is. Among them, the smaller the contact area between the first pressing roller 42 and the pole piece 100 is, the greater the risk of relative sliding between the pole piece 100 and the first driving roller 41 is. However, since the processing position of the pole piece processing mechanism 30 located upstream of the cache mechanism 40 on the pole piece 100 is relatively precise, the relative sliding between the pole piece 100 and the first driving roller 41 will also affect the offset of the processing position of the pole piece processing mechanism 30, thereby affecting the product yield. The greater the risk of the first pressing roller 42 pressing the empty foil area of ​​the pole piece 100 is, the greater the risk of wrinkles in the pole piece 100 is.

[0100] In this way, the above technical solution can reduce the risk of relative sliding between the pole piece 100 and the first driving roller 41 while reducing the risk of the first pressure roller 42 pressing the empty foil area of ​​the pole piece 100 by setting the length L of the first pressure roller 42 within the above range, thereby effectively improving the product yield.

[0101] Further, the length L of the first pressing roller 42 satisfies the relationship: 80 mm ≤ L ≤ 160 mm. As an example, the length L of the first pressing roller 42 may be, but is not limited to, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, etc.

[0102] In some embodiments, the diameter D of the first pressing roller 42 satisfies the relationship: 10 mm≤D≤150 mm.

[0103] As an example, the diameter D of the first pressing roller 42 may be, but is not limited to, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, etc.

[0104] It is understandable that the larger the diameter D of the first pressure roller 42 is, the larger the contact area between the first pressure roller 42 and the pole piece 100 is, and the larger the space occupancy rate of the first pressure roller 42 is; the smaller the diameter D of the first pressure roller 42 is, the smaller the contact area between the first pressure roller 42 and the pole piece 100 is, and the smaller the space occupancy rate of the first pressure roller 42 is. Among them, the smaller the contact area between the first pressure roller 42 and the pole piece 100 is, the greater the risk of relative sliding between the pole piece 100 and the first drive roller 41 is. However, since the processing position of the pole piece processing mechanism 30 located upstream of the cache mechanism 40 on the pole piece 100 is relatively precise, the relative sliding between the pole piece 100 and the first drive roller 41 will also affect the offset of the processing position of the pole piece processing mechanism 30, thereby affecting the product yield. The larger the space occupancy rate of the first pressure roller 42 is, the greater the difficulty of the overall layout of the cache mechanism 40 will be, and it will also be inconvenient for maintenance.

[0105] Thus, the above technical solution can reduce the risk of relative sliding between the pole piece 100 and the first driving roller 41 while reducing the space occupancy rate of the first pressing roller 42 by setting the diameter D of the first pressing roller 42 within the above range.

[0106] Further, the diameter D of the first pressing roller 42 satisfies the relationship: 20 mm ≤ D ≤ 50 mm. As an example, the length L of the first pressing roller 42 may be, but is not limited to, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm, etc.

[0107] Figure 4 A schematic side view of the structure of a first pressure roller 42 of another winding device provided in some embodiments of the present application.

[0108] Continue to refer Figure 4 In some embodiments, the first pressing roller 42 includes a roller body 421 and a buffer layer 422 . The buffer layer 422 is disposed on the surface of the roller body 421 . The rigidity of the buffer layer 422 is smaller than that of the roller body 421 .

[0109] Exemplarily, stiffness is a physical quantity used to describe the ability of a structure to resist deformation under external force. The stiffness of the buffer layer 422 is less than that of the roller body 421, that is, the ability of the buffer layer 422 to resist deformation under external force is less than that of the roller body 421, that is, the texture of the buffer layer 422 is softer.

[0110] The stiffness of the buffer layer 422 and the roller body 421 can be measured by static loading method, dynamic testing method or finite element analysis. As an example, in the static loading method, a known static load is applied to the test sample, and then the displacement or deformation of the sample is measured. Specifically, the load is first gradually applied to the test structure, and then the corresponding displacement or deformation is measured, and finally the stiffness is calculated using the formula K=F / S, where K is the stiffness, F is the force applied to the test structure, and S is the displacement of the test structure under the force applied to the test structure. The specific steps of the dynamic testing method and finite element analysis can be referred to the methods in the existing technical literature and will not be repeated here.

[0111] The roller body 421 is used to be connected to an external driving component, and the driving component can drive the roller body 421 to rotate or move. For example, the driving component can be but is not limited to a motor or a screw assembly. The buffer layer 422 is arranged on the surface of the roller body 421 for direct contact with the pole piece 100. The buffer layer 422 can be detachably connected to the roller body 421, or it can be fixedly connected to the roller body 421. Among them, the buffer layer 422 can be directly connected to the roller body 421, or it can be restricted to the roller body 421 by other components. As an example, the connection method between the buffer layer 422 and the roller body 421 can be but is not limited to bolt connection, riveting, clamping or bonding. Optionally, the material of the buffer layer 422 can be but is not limited to polyurethane, silicone, rubber or latex.

[0112] The above technical solution arranges a buffer layer 422 whose stiffness is smaller than that of the roller body 421. On the one hand, the smaller stiffness of the buffer layer 422 makes the texture of the buffer layer 422 softer, thereby reducing the risk of damaging the pole piece 100 when the first pressure roller 42 is in direct contact with the pole piece 100; on the other hand, the higher stiffness of the roller body 421 can improve the connection firmness between the first pressure roller 42 and the external driving component, thereby improving the reliability of the cache mechanism 40.

[0113] In some embodiments, buffer layer 422 includes an elastomer.

[0114] When the first pressure roller 42 applies pressure to the pole piece 100, the elastomer can deform quickly to transmit the pressure to the pole piece 100. At the same time, the elastomer can undergo adaptive elastic deformation according to the shape of the pole piece 100 during the process of applying pressure to the pole piece 100, thereby improving the uniformity of the force on the pole piece 100 and further reducing the risk of damaging the pole piece 100.

[0115] Figure 5 A schematic structural diagram of an electrode assembly provided in some embodiments of the present application.

[0116] Continue to refer Figure 5 In some embodiments, the pole piece processing mechanism 30 includes a gluing mechanism 31 , and the gluing mechanism 31 is used to glue the pole piece 100 .

[0117] The glue sticking mechanism 31 can stick protective glue 200 on both sides of the part to be glued on the electrode sheet 100 before the electrode sheet 100 is wound. The part to be glued is the corner of the innermost circle of the wound electrode sheet 100, so that the corner of the wound electrode sheet 100 is protected during the pressure process to reduce the risk of cracking. Further, the glue sticking mechanism 31 is used to stick protective glue 200 on both sides of the part to be glued on the cathode electrode sheet 100.

[0118] As an example, the gluing mechanism 31 includes a first gluing component 311 and a second gluing component 312, and the first gluing component 311 and the second gluing component 312 are arranged at intervals along the conveying direction of the pole piece 100. The part of the pole piece 100 to be glued includes a first gluing portion and a second gluing portion, and the first gluing portion and the second gluing portion are respectively two opposite corners of the innermost circle of the pole piece 100 after winding along its own length direction. The first gluing component 311 and the second gluing component 312 can simultaneously apply protective glue 200 on both sides of the first gluing portion and both sides of the second gluing portion of the pole piece 100 before winding the pole piece 100, thereby greatly improving the overall gluing efficiency.

[0119] In some embodiments, the winding device further includes a diaphragm unwinding mechanism, the diaphragm unwinding mechanism is used to provide the diaphragm, and the winding mechanism 20 is used to wind the pole piece 100 and the diaphragm.

[0120] According to some embodiments of the present application, the present application also provides a battery production line, comprising a winding device of any of the above schemes.

[0121] In order to better understand the winding device provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned winding device in practical application is provided here for illustration.

[0122] The embodiment of the present application provides a winding device, which includes a pole piece unwinding mechanism 10, a winding mechanism 20, a gluing mechanism 31 and a buffer mechanism 40. The pole piece unwinding mechanism 10 is used to provide a pole piece 100, the winding mechanism 20 is used to wind the pole piece 100, the gluing mechanism 31 is arranged between the pole piece unwinding mechanism 10 and the winding mechanism 20 along the conveying direction of the pole piece 100, and the gluing mechanism 31 is used to glue the pole piece 100. The buffer mechanism 40 is arranged between the gluing mechanism 31 and the winding mechanism 20 along the conveying direction of the pole piece 100, and the buffer mechanism 40 is used to cache the pole piece 100.

[0123] The cache mechanism 40 includes a first drive roller 41, a first pressure roller 42, a plurality of transmission rollers 43, a second drive roller 44 and a second pressure roller 45. The first pressure roller 42 is used to press the pole piece 100 against the first drive roller 41. The plurality of transmission rollers 43 are located downstream of the first drive roller 41. The plurality of transmission rollers 43 are arranged between the first drive roller 41 and the winding device along the conveying direction of the pole piece 100. At least one transmission roller 43 can move relative to the first drive roller 41. Each transmission roller 43 can move in a direction perpendicular to the horizontal plane 300. At least two adjacent transmission rollers 43 along the conveying direction of the pole piece 100 are staggered in a direction perpendicular to the horizontal plane 300. The second drive roller 44 is located downstream of the plurality of transmission rollers 43. The second pressure roller 45 is used to press the pole piece 100 against the second drive roller 44.

[0124] The first driving roller 41 includes a first feed end 411 and a first discharge end 412. In the rotation direction of the first driving roller 41, the first pressure roller 42 is located between the first feed end 411 and the first discharge end 412 and is spaced apart from the first feed end 411. In the rotation direction of the first driving roller 41, the distance between the first pressure roller 42 and the first discharge end 412 is smaller than the distance between the first pressure roller 42 and the first feed end 411.

[0125] The second driving roller 44 includes a second feed end 441 and a second discharge end 442. In the rotation direction of the second driving roller 44, the second pressing roller 45 is located between the second feed end 441 and the second discharge end 442 and is spaced apart from the second feed end 441. The distance between the second pressing roller 45 and the second discharge end 442 is smaller than the distance between the second pressing roller 45 and the second feed end 441.

[0126] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A winding device, characterized in that: include: A pole piece unwinding mechanism, used for providing pole pieces; A winding mechanism, used for winding the pole piece; A pole piece processing mechanism, arranged between the pole piece unwinding mechanism and the winding mechanism along the conveying direction of the pole piece, the pole piece processing mechanism being used for processing the pole piece; A cache mechanism, arranged between the pole piece processing mechanism and the winding mechanism along the conveying direction of the pole piece, the cache mechanism being used to cache the pole piece; Wherein, the cache mechanism includes a first drive roller and a first pressure roller, the first pressure roller is used to press the pole piece against the first drive roller, the first drive roller includes a first feed end and a first discharge end, and in the rotation direction of the first drive roller, the first pressure roller is located between the first feed end and the first discharge end and is spaced from the first feed end.

2. The winding device according to claim 1, characterized in that In the rotation direction of the first driving roller, the distance between the first pressing roller and the first discharging end is smaller than the distance between the first pressing roller and the first feeding end.

3. The winding device according to claim 1, characterized in that: The cache mechanism includes a plurality of transmission rollers located downstream of the first driving roller, the plurality of transmission rollers are arranged between the first driving roller and the winding device along the conveying direction of the pole piece, and at least one of the transmission rollers can move relative to the first driving roller.

4. The winding device according to claim 3, characterized in that: Each of the driving rollers can move along a direction perpendicular to the horizontal plane.

5. The winding device according to claim 3, characterized in that: At least two adjacent driving rollers along the conveying direction of the pole piece are staggered in a direction perpendicular to the horizontal plane.

6. The winding device according to claim 3, characterized in that: The cache mechanism further comprises a second driving roller and a second pressing roller, wherein the second driving roller is located downstream of the plurality of transmission rollers; The second pressure roller is used to press the pole piece against the second driving roller, the second driving roller includes a second feed end and a second discharge end, and in the rotation direction of the second driving roller, the second pressure roller is located between the second feed end and the second discharge end and is spaced apart from the second feed end.

7. The winding device according to claim 1, characterized in that: The length of the first pressing roller is smaller than the length of the first driving roller.

8. The winding device according to claim 1, characterized in that The length L of the first pressing roller satisfies the relationship: 50 mm≤L≤300 mm.

9. The winding device according to claim 1, characterized in that: The diameter D of the first pressing roller satisfies the relationship: 10 mm ≤ D ≤ 150 mm.

10. The winding device according to claim 1, characterized in that The first pressing roller comprises a roller body and a buffer layer, wherein the buffer layer is arranged on the surface of the roller body, and the rigidity of the buffer layer is smaller than the rigidity of the roller body.

11. The winding device according to claim 1, characterized in that: The pole piece processing mechanism includes a gluing mechanism, and the gluing mechanism is used to glue the pole piece.

12. The winding device according to any one of claims 1 to 11, characterized in that: The winding device further comprises a diaphragm unwinding mechanism, wherein the diaphragm unwinding mechanism is used to provide the diaphragm, and the winding mechanism is used to wind the pole piece and the diaphragm.

13. A battery production line, characterized in that: Comprising a winding device as described in any one of claims 1-12.

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