Winding device

Abstract

The present application relates to the field of batteries. Provided is a winding device. The winding device comprises a first winding and unwinding mechanism, a second winding and unwinding mechanism, and a winding mechanism, wherein the first winding and unwinding mechanism is configured to wind or unwind an electrode sheet, and the second winding and unwinding mechanism is configured to wind or unwind a separator. The winding mechanism is configured in such a way that, when the first winding and unwinding mechanism and the second winding and unwinding mechanism are unwound, the electrode sheet and the separator can be wound, and when the first winding and unwinding mechanism and the second winding and unwinding mechanism are wound, the electrode sheet and the separator can be unwound. When it is found that a wound electrode assembly does not meet a design requirement, the first winding and unwinding mechanism winds the electrode sheet, and the second winding and unwinding mechanism winds the separator, such that the electrode assembly wound by the winding mechanism is unwound, and is manually or automatically corrected; and then, the first winding and unwinding mechanism unwinds the electrode sheet, and the second winding and unwinding mechanism unwinds the separator, rewinding is performed by means of the winding mechanism, such that the rewound electrode assembly meets the design requirement, and in turn there is no need to waste the whole electrode assembly, thereby reducing the production cost.

Description

Winding device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application entitled “Winding Device” filed on April 3, 2024 (application number: 2024104061031), the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a winding device. Background Art

[0004] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. Batteries include electrode assemblies, which are the components within the battery where electrochemical reactions occur. Electrode assemblies include wound electrode assemblies and laminated electrode assemblies. Currently, wound electrode assemblies are relatively expensive to produce.

[0005] Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a winding device, which aims to improve the problem of high production cost of wound electrode assemblies in the related art.

[0007] An embodiment of the present application provides a winding device, which includes a first rewinding and unwinding mechanism, a second rewinding and unwinding mechanism and a winding mechanism, wherein the first rewinding and unwinding mechanism is used to rewind or unwind the pole piece; the second rewinding and unwinding mechanism is used to rewind or unwind the isolation film; the winding mechanism is configured to: be able to wind the pole piece and the isolation film when the first rewinding and unwinding mechanism and the second rewinding and unwinding mechanism are unwinding, and be able to unwind the pole piece and the isolation film when the first rewinding and unwinding mechanism and the second rewinding and unwinding mechanism are rewinding.

[0008] In the above technical solution, during normal winding, the first reel-in mechanism unwinds the electrode sheet, and the second reel-in mechanism unwinds the separator. The electrode sheet unwound by the first reel-in mechanism and the separator unwound by the second reel-in mechanism are then wound together by the winding mechanism to form an electrode assembly. If it is found that the wound electrode assembly does not meet the design requirements, the first reel-in mechanism rewinds the electrode sheet, and the second reel-in mechanism rewinds the separator, so that the electrode assembly wound by the winding mechanism is unwound. After manual or automatic correction, the first reel-in mechanism unwinds the electrode sheet, and the second reel-in mechanism unwinds the separator, and the winding mechanism rewinds the electrode assembly. This ensures that the rewound electrode assembly meets the design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs.

[0009] As an optional technical solution of an embodiment of the present application, the winding device also includes a first bidirectional smoothing mechanism, which is located downstream of the first rewinding and unwinding mechanism and upstream of the winding mechanism. The first bidirectional smoothing mechanism is configured to smooth the pole piece when the first rewinding and unwinding mechanism is rewinding or unwinding.

[0010] In the above technical solution, when the first reeling and unreeling mechanism unwinds the electrode sheet, the first bidirectional smoothing mechanism can smooth the electrode sheet unwound by the first reeling and unreeling mechanism, reducing the risk of wrinkling the electrode sheet, which helps ensure that the electrode assembly wound by the winding mechanism meets design requirements. When the first reeling and unreeling mechanism rewinds the electrode sheet, the electrode assembly wound by the winding mechanism unwinds, and the first bidirectional smoothing mechanism can smooth the electrode sheet unwound by the winding mechanism, reducing the risk of wrinkling the electrode sheet, allowing the electrode sheet to be smoothly rewound to the first reeling and unreeling mechanism, thereby facilitating rewinding.

[0011] As an optional technical solution of an embodiment of the present application, the first bidirectional smoothing mechanism includes a roller and a first smoothing member, and there is a first gap between the first smoothing member and the roller. The first gap is used for the pole piece to pass through, and the first smoothing member and the roller are used to cooperate to smooth the pole piece.

[0012] In the above technical solution, when the first rewinding and unwinding mechanism unwinds the electrode sheet, the electrode sheet can pass through the first gap formed between the first smoothing member and the roller in the forward direction and be smoothed by the first smoothing member and the roller, thereby reducing the risk of the electrode sheet wrinkling. When the first rewinding and unwinding mechanism rewinds the electrode sheet, the electrode assembly wound by the winding mechanism is unwound, and the electrode sheet can pass through the first gap formed between the first smoothing member and the roller in the reverse direction and be smoothed by the first smoothing member and the roller, thereby reducing the risk of the electrode sheet wrinkling.

[0013] As an optional technical solution of an embodiment of the present application, the first smoothing member includes a first smoothing portion, a first guide portion and a second guide portion, and the first gap is formed between the first smoothing portion and the outer peripheral surface of the roller; along the conveying direction of the pole piece, the first guide portion and the second guide portion are respectively connected to the two sides of the first smoothing portion, and the first guide portion is configured to guide the pole piece to the first gap when the first rewinding mechanism is unwinding, and the second guide portion is configured to guide the pole piece to the first gap when the first rewinding mechanism is rewinding.

[0014] In the above technical solution, the first guide portion is configured to guide the electrode sheet to the first gap when the first reel-and-unwind mechanism is unwinding, thereby achieving positive smoothing of the electrode sheet. The second guide portion is configured to guide the electrode sheet to the first gap when the first reel-and-unwind mechanism is rewinding, thereby achieving negative smoothing of the electrode sheet. In this way, regardless of whether the first reel-and-unwind mechanism is rewinding or unwinding, the electrode sheet can be smoothed, reducing the risk of wrinkling the electrode sheet and facilitating rewinding of the winding mechanism.

[0015] As an optional technical solution of an embodiment of the present application, the first guide portion and the second guide portion are both bent in a direction away from the roller compared to the first smoothing portion.

[0016] In the above technical solution, by bending the first guide portion away from the roller relative to the first smoothing portion, the electrode sheet is guided into the first gap when the first rewinding and unwinding mechanism unwinds, thereby achieving positive smoothing of the electrode sheet. By bending the second guide portion away from the roller relative to the first smoothing portion, the electrode sheet is guided into the first gap when the first rewinding and unwinding mechanism rewinds, thereby achieving negative smoothing of the electrode sheet.

[0017] As an optional technical solution of an embodiment of the present application, the first guide portion and the second guide portion extend along an arc trajectory.

[0018] In the above technical solution, the first guide portion and the second guide portion both extend along an arc trajectory, so that the first guide portion and the second guide portion are relatively smooth and the transition is smooth, which can reduce the stress on the pole piece and reduce the risk of pole piece damage.

[0019] As an optional technical solution of an embodiment of the present application, the first smoothing portion extends along a straight line trajectory; or the first smoothing portion extends along an arc trajectory, and the center of the arc trajectory is located on the axis of the roller.

[0020] In the above technical solution, when the first smoothing portion extends along a straight trajectory, the length of the first gap is short, the pole piece can pass through the first gap quickly, the external force on the pole piece is small, and the risk of damage to the pole piece is reduced. When the first smoothing portion extends along a circular trajectory with the center of the circular trajectory located on the axis of the roller, the length of the first gap is long, the smoothing effect on the pole piece is better, and the pole piece can be bent, thereby changing the running direction.

[0021] As an optional technical solution of an embodiment of the present application, the winding device includes a plurality of the first bidirectional smoothing mechanisms, and the plurality of the first bidirectional smoothing mechanisms are arranged along the conveying direction of the pole piece.

[0022] In the above technical solution, by arranging a plurality of first bidirectional smoothing mechanisms along the conveying direction of the electrode sheet, the smoothing effect on the electrode sheet is enhanced, the risk of wrinkling of the electrode sheet is reduced, and the quality of the wound electrode sheet is improved.

[0023] As an optional technical solution of an embodiment of the present application, the winding device includes a first conveying mechanism, which is located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism, and is used to convey the pole piece in a forward or reverse direction.

[0024] In the above technical solution, the first conveying mechanism is provided to provide sufficient power for forward or reverse conveying of the electrode, thereby accelerating the electrode conveying speed, especially when the electrode conveying path is long. In addition, the first conveying mechanism can form a tension barrier, so that the tension during the electrode conveying process is balanced, reducing the risk of electrode breakage due to excessive tension.

[0025] As an optional technical solution of an embodiment of the present application, the first conveying mechanism includes a first driven roller and a first active roller, and there is a second gap between the first active roller and the first driven roller, and the second gap is used for the passage of the pole piece. The first active roller is configured to be able to rotate forward or reverse to cooperate with the first driven roller to convey the pole piece in a forward or reverse direction.

[0026] In the above technical solution, a second gap is defined between the first active roller and the first driven roller, through which the electrode piece can pass. When the first active roller rotates in the forward direction, the first active roller and the first driven roller cooperate to transport the electrode piece in the forward direction. When the first active roller rotates in the reverse direction, the first active roller and the first driven roller cooperate to transport the electrode piece in the reverse direction.

[0027] As an optional technical solution of an embodiment of the present application, the first conveying mechanism also includes a second bidirectional smoothing mechanism, and the second bidirectional smoothing mechanism is arranged upstream and / or downstream of the first active roller. The second bidirectional smoothing mechanism is configured to smooth the electrode sheet when the first active roller and the first driven roller cooperate to convey the electrode sheet in forward or reverse direction.

[0028] In the above technical solution, a second bidirectional smoothing mechanism is arranged upstream and / or downstream of the first active roller, so that the pole piece is smoothed before passing through the second gap, thereby reducing the risk of wrinkled pole ears entering the second gap. In this way, the pole piece is not easily damaged under the cooperation of the first active roller and the first driven roller.

[0029] As an optional technical solution of an embodiment of the present application, the second bidirectional smoothing mechanism includes two second smoothing members, and there is a third gap between the two second smoothing members. The third gap is used for the pole piece to pass through, and the two second smoothing members are used to cooperate in smoothing the pole piece.

[0030] In the above technical solution, when the first active roller rotates in the forward direction, the electrode sheet can pass through the third gap formed between the two second smoothing members in the forward direction and be smoothed by the two second smoothing members, reducing the risk of electrode sheet wrinkling. When the first active roller rotates in the reverse direction, the electrode assembly wound by the winding mechanism is unwound, and the electrode sheet can pass through the third gap formed between the two second smoothing members in the reverse direction and be smoothed by the two second smoothing members, reducing the risk of electrode sheet wrinkling.

[0031] As an optional technical solution of an embodiment of the present application, the second smoothing member includes a second smoothing portion, a third guide portion and a fourth guide portion, and the third gap is formed between the second smoothing portions of the two second smoothing members; along the conveying direction of the electrode piece, the third guide portion and the fourth guide portion are respectively connected to the two sides of the second smoothing portion, and the third guide portion is configured to guide the electrode piece to the third gap when the first active roller and the first driven roller cooperate to convey the electrode piece in the forward direction, and the fourth guide portion is configured to guide the electrode piece to the third gap when the first active roller and the first driven roller cooperate to convey the electrode piece in the reverse direction.

[0032] In the above technical solution, the third guide portion is configured to guide the electrode sheet to the third gap when the first active roller and the first driven roller cooperate to convey the electrode sheet in the forward direction, thereby achieving forward smoothing of the electrode sheet. The fourth guide portion is configured to guide the electrode sheet to the third gap when the first active roller and the first driven roller cooperate to convey the electrode sheet in the reverse direction, thereby achieving reverse smoothing of the electrode sheet. In this way, regardless of whether the first active roller rotates forward or reverse, the electrode sheet can be smoothed, reducing the risk of wrinkling the electrode sheet and facilitating rewinding by the winding mechanism.

[0033] As an optional technical solution of the embodiment of the present application, the third guide portion and the fourth guide portion of each second smoothing member are bent in a direction away from the other second smoothing member compared to the second smoothing portion.

[0034] In the above technical solution, by bending the third guide portion in a direction away from the other second smoothing member relative to the second smoothing portion, the pole piece is guided into the third gap when the first active roller rotates in the forward direction, thereby achieving forward smoothing of the pole piece. By bending the fourth guide portion in a direction away from the other second smoothing member relative to the second smoothing portion, the pole piece is guided into the third gap when the first active roller rotates in the reverse direction, thereby achieving reverse smoothing of the pole piece.

[0035] As an optional technical solution of an embodiment of the present application, the winding device includes a plurality of the first conveying mechanisms, and the plurality of the first conveying mechanisms are arranged along the conveying direction of the pole piece. Along the conveying direction of the pole piece, the first conveying mechanism closest to the winding mechanism is used to introduce the pole piece into the winding mechanism.

[0036] In the above technical solution, the first conveying mechanism closest to the winding mechanism can guide the electrode sheet into the winding mechanism, further reducing the risk of wrinkling of the electrode sheet wound by the winding mechanism, which is conducive to making the wound electrode assembly meet the design requirements and thus reducing production costs.

[0037] As an optional technical solution of an embodiment of the present application, the winding device also includes a second conveying mechanism, which is located downstream of the second rewinding and unwinding mechanism and upstream of the winding mechanism, and the second conveying mechanism is used to convey the isolation film in a forward or reverse direction.

[0038] In this technical solution, the second conveying mechanism provides sufficient power for forward and reverse transport of the separator, accelerating the separator's transport speed, particularly over long conveying paths. Furthermore, the second conveying mechanism creates a tension barrier, balancing the separator's tension during transport and reducing the risk of separator breakage due to excessive tension.

[0039] As an optional technical solution of an embodiment of the present application, the second conveying mechanism includes a second driven roller and a second active roller, and there is a fourth gap between the second active roller and the second driven roller, and the fourth gap is used for the isolation film to pass through. The second active roller is configured to be able to rotate forward or reverse to cooperate with the second driven roller to convey the isolation film in a forward or reverse direction.

[0040] In the above technical solution, a fourth gap is defined between the second active roller and the second driven roller, through which the separator film can pass. When the second active roller rotates in the forward direction, the second active roller and the second driven roller cooperate to convey the separator film in the forward direction. When the second active roller rotates in the reverse direction, the second active roller and the second driven roller cooperate to convey the separator film in the reverse direction.

[0041] As an optional technical solution of an embodiment of the present application, the winding device includes a first cache mechanism, which is located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism, and is used to cache the pole piece.

[0042] In the above technical solution, at the initial stage of the winding device starting up, the first rewinding and unwinding mechanism cannot unwind too quickly, otherwise it will easily cause the electrode to break. By setting up a first cache mechanism, at the initial stage of the winding device starting up, the electrode cached by the first cache mechanism can be quickly released, and the electrode can be supplied to the winding mechanism, while the first rewinding and unwinding mechanism is slowly accelerated. In this way, the production rhythm can be accelerated and the production cost can be reduced. In addition, when it is found that the wound electrode assembly does not meet the design requirements, the electrode assembly wound by the winding mechanism can be unwound and the electrode can be cached in the first cache mechanism, without having to be rewound into the first rewinding and unwinding mechanism. When rewinding, the electrode cached in the first cache mechanism can be released. In this way, the path of forward and reverse conveyance of the electrode becomes shorter, which is conducive to reducing the rewinding time, accelerating the rewinding efficiency, and thus reducing production costs.

[0043] As an optional technical solution of an embodiment of the present application, the first cache mechanism includes a first fixed roller group, a first movable roller group and a first driving mechanism, the first fixed roller group includes at least one first fixed roller; the first movable roller group includes at least one first movable roller, the first movable roller group and the first fixed roller group are arranged along the first direction, and the pole pieces are alternately wound around the first fixed roller and the first movable roller; the first driving mechanism is connected to the first movable roller, and the first driving mechanism is used to drive the first movable roller to move along the first direction.

[0044] In the above technical solution, the pole piece is alternately wound around the first fixed roller and the first movable roller. When the pole piece needs to be cached, the first driving mechanism can drive the first movable roller away from the first fixed roller in the first direction, thereby increasing the distance between the first movable roller and the first fixed roller to cache the pole piece. When the pole piece needs to be released, the first driving mechanism can drive the first movable roller toward the first fixed roller in the first direction, thereby reducing the distance between the first movable roller and the first fixed roller to release the pole piece.

[0045] As an optional technical solution of an embodiment of the present application, the first fixed roller group includes a plurality of the first fixed rollers, and the plurality of the first fixed rollers are arranged at intervals along the second direction; and / or the first movable roller group includes a plurality of the first movable rollers, and the plurality of the first movable rollers are arranged at intervals along the second direction; wherein the second direction intersects with the first direction.

[0046] In the above technical solution, by providing a plurality of first fixed rollers and a plurality of first movable rollers, the pole pieces are alternately passed around the first fixed rollers and the first movable rollers, thereby increasing the length of the cached pole pieces.

[0047] As an optional technical solution of an embodiment of the present application, the winding device includes a first conveying mechanism and a first cache mechanism, the first conveying mechanism is used to convey the pole piece in forward or reverse direction; the first cache mechanism is located downstream of the first reeling and unwinding mechanism and upstream of the winding mechanism, and the first cache mechanism is used to cache the pole piece; wherein the first conveying mechanism is provided both upstream and downstream of the first cache mechanism.

[0048] In the above technical solution, by arranging the first conveying mechanism upstream and / or downstream of the first cache mechanism, it is convenient for the first conveying mechanism to provide the electrode sheet to the first cache mechanism for cache, and the electrode sheet can be quickly output when the first cache mechanism releases the electrode sheet.

[0049] As an optional technical solution of an embodiment of the present application, the winding device includes a second cache mechanism, which is located downstream of the second reeling and unreeling mechanism and upstream of the winding mechanism, and is used to cache the isolation film.

[0050] In the above technical solution, at the initial stage of the winding device starting up, the second rewinding and unwinding mechanism cannot unwind too quickly, otherwise it will easily cause the isolation membrane to break. By setting up a second cache mechanism, at the initial stage of the winding device starting up, the isolation membrane cached by the second cache mechanism can be quickly released, and the isolation membrane can be supplied to the winding mechanism, while the second rewinding and unwinding mechanism is slowly accelerated. In this way, the production rhythm can be accelerated and the production cost can be reduced. In addition, when it is found that the wound electrode assembly does not meet the design requirements, the electrode assembly wound by the winding mechanism can be unwound and the isolation membrane can be cached in the second cache mechanism, without having to be rewound into the second rewinding and unwinding mechanism. When rewinding, the isolation membrane cached in the second cache mechanism can be released. In this way, the path of forward and reverse conveyance of the isolation membrane becomes shorter, which is conducive to reducing the rewinding time, accelerating the rewinding efficiency, and thus reducing production costs.

[0051] As an optional technical solution of an embodiment of the present application, the second cache mechanism includes a second fixed roller group, a second movable roller group and a second driving mechanism, the second fixed roller group includes at least one second fixed roller; the second movable roller group includes at least one second movable roller, the second movable roller group and the second fixed roller group are arranged along a third direction, and the isolation membrane is alternately wound around the second fixed roller and the second movable roller; the second driving mechanism is connected to the second movable roller, and the second driving mechanism is used to drive the second movable roller to move along the third direction.

[0052] In the above technical solution, the isolation film is alternately wound around the second fixed roller and the second movable roller. When the isolation film needs to be buffered, the second driving mechanism can drive the second movable roller in the third direction away from the second fixed roller, thereby increasing the distance between the second movable roller and the second fixed roller to achieve buffering of the isolation film. When the isolation film needs to be released, the second driving mechanism can drive the second movable roller in the third direction toward the second fixed roller, thereby decreasing the distance between the second movable roller and the second fixed roller to achieve release of the isolation film.

[0053] As an optional technical solution of an embodiment of the present application, the second fixed roller group includes a plurality of second fixed rollers, and the plurality of second fixed rollers are arranged at intervals along the fourth direction; and / or the second movable roller group includes a plurality of second movable rollers, and the plurality of second movable rollers are arranged at intervals along the fourth direction; wherein, the fourth direction intersects with the third direction.

[0054] In the above technical solution, by providing a plurality of second fixed rollers and a plurality of second movable rollers, the isolation film is alternately passed around the second fixed rollers and the second movable rollers, thereby increasing the length of the buffered isolation film.

[0055] As an optional technical solution of an embodiment of the present application, the winding device includes a first detection mechanism, which is used to detect the misalignment of the pole ear of the pole piece wound on the winding mechanism, and the first rewinding and unwinding mechanism and the second rewinding and unwinding mechanism respond to the first detection mechanism.

[0056] In the above technical solution, a first detection mechanism is provided to facilitate detection of the amount of tab misalignment of the electrode sheet. When the first detection mechanism detects that the amount of tab misalignment of the electrode sheet exceeds a threshold value, the first rewinding and unwinding mechanism rewinds the electrode sheet, and the second rewinding and unwinding mechanism rewinds the separator, thereby unwinding the electrode assembly wound by the winding mechanism. After manually or automatically correcting the amount of tab misalignment, the first rewinding and unwinding mechanism unwinds the electrode sheet, and the second rewinding and unwinding mechanism unwinds the separator, and the winding mechanism rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, avoids wasting the entire electrode assembly, and thus reduces production costs.

[0057] As an optional technical solution of an embodiment of the present application, the winding mechanism includes a winding needle and an adjustment component, the winding needle is used to wind the pole piece and the isolation membrane, the adjustment component is used to adjust the winding radius of the winding needle, and the adjustment component responds to the first detection mechanism.

[0058] In the above technical solution, the adjustment component can adjust the winding radius of the winding needle, thereby automatically correcting the amount of tab misalignment. When the first detection mechanism detects that the amount of tab misalignment of the electrode sheet exceeds a threshold, the first reeling and unreeling mechanism rewinds the electrode sheet, and the second reeling and unreeling mechanism rewinds the separator, thereby unwinding the electrode assembly wound by the winding mechanism. The adjustment mechanism adjusts the winding radius of the winding needle based on the amount of tab misalignment detected by the first detection mechanism to automatically correct the amount of tab misalignment. Thereafter, the first reeling and unreeling mechanism unwinds the electrode sheet, and the second reeling and unreeling mechanism unwinds the separator, and the winding mechanism rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs.

[0059] As an optional technical solution of an embodiment of the present application, the winding device includes two first winding and unwinding mechanisms, one first winding and unwinding mechanism is used to wind up or unwind the negative electrode sheet, and the other first winding and unwinding mechanism is used to wind up or unwind the positive electrode sheet; the winding device also includes a second detection mechanism, the second detection mechanism is used to detect the amount by which the negative electrode sheet wound on the winding mechanism exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism, and the first winding and unwinding mechanism responds to the second detection mechanism.

[0060] In the above technical solution, a second detection mechanism is provided to facilitate detection of the amount by which the negative electrode sheet wound on the winding mechanism protrudes beyond the positive electrode sheet along the extension direction of the winding axis of the winding mechanism. When the second detection mechanism detects that the excess is below a threshold, the first rewinding and unwinding mechanism rewinds the electrode sheet, and the second rewinding and unwinding mechanism rewinds the separator, thereby unwinding the electrode assembly wound by the winding mechanism. After manually or automatically correcting the excess, the first rewinding and unwinding mechanism unwinds the electrode sheet, and the second rewinding and unwinding mechanism unwinds the separator, and the winding mechanism rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, avoids wasting the entire electrode assembly, and thus reduces production costs.

[0061] As an optional technical solution of an embodiment of the present application, the winding device also includes a correction mechanism, and each first reeling and unwinding mechanism is correspondingly provided with at least one correction mechanism, the correction mechanism responds to the second detection mechanism, and the correction mechanism is used to correct the negative electrode sheet or the positive electrode sheet.

[0062] In the above technical solution, the deviation correction mechanism is capable of correcting the deviation of the positive or negative electrode sheet to automatically correct the excess of the negative electrode sheet relative to the positive electrode sheet along the extension direction of the winding axis of the winding mechanism. When the second detection mechanism detects that the excess is below a threshold, the first reeling and unreeling mechanism rewinds the electrode sheet and the second reeling and unreeling mechanism rewinds the separator, thereby unwinding the electrode assembly wound by the winding mechanism. After the deviation correction mechanism corrects the deviation of the positive or negative electrode sheet, the first reeling and unreeling mechanism unwinds the electrode sheet and the second reeling and unreeling mechanism unwinds the separator, and the winding mechanism rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0064] FIG1 is a schematic structural diagram of a winding device provided in some embodiments of the present application;

[0065] FIG2 is a schematic structural diagram of a winding device provided in some other embodiments of the present application;

[0066] FIG3 is a schematic structural diagram of a first bidirectional smoothing mechanism provided in some embodiments of the present application;

[0067] FIG4 is a schematic structural diagram of a first bidirectional smoothing mechanism provided in other embodiments of the present application;

[0068] FIG5 is a schematic structural diagram of a winding device provided in some other embodiments of the present application;

[0069] FIG6 is a schematic structural diagram of a first conveying mechanism provided in some embodiments of the present application;

[0070] FIG7 is a schematic structural diagram of a second conveying mechanism provided in some embodiments of the present application;

[0071] FIG8 is a schematic structural diagram of a winding device provided in some further embodiments of the present application;

[0072] FIG9 is a schematic structural diagram of a first cache mechanism provided in some embodiments of the present application;

[0073] FIG10 is a schematic structural diagram of a second cache mechanism provided in some embodiments of the present application;

[0074] FIG11 is a schematic block diagram of the connection between a first detection mechanism and a first reeling and unreeling mechanism provided in some embodiments of the present application;

[0075] FIG12 is a schematic block diagram of the connection between the second detection mechanism and the first rewinding and unwinding mechanism provided in some embodiments of the present application.

[0076] Icons: 10-winding device; 100-first winding and unwinding mechanism; 110-first winding and unwinding roller; 200-second winding and unwinding mechanism; 210-second winding and unwinding roller; 300-winding mechanism; 310-adjusting assembly; 400-first two-way smoothing mechanism; 410-pass roller; 420-first smoothing member; 421-first smoothing portion; 422-first guide portion; 423-second guide portion; 430-first gap; 500-first conveying mechanism; 510-first active roller; 511-second gap; 520-first driven roller; 530-second smoothing member; 531-second smoothing portion; 532-third guide portion Guide portion; 533-fourth guide portion; 540-third gap; 600-second conveying mechanism; 610-second active roller; 620-second driven roller; 630-fourth gap; 700-first cache mechanism; 710-first fixed roller group; 711-first fixed roller; 720-first movable roller group; 721-first movable roller; 800-second cache mechanism; 810-second fixed roller group; 811-second fixed roller; 820-second movable roller group; 821-second movable roller; 910-first detection mechanism; 920-second detection mechanism; 930-correction mechanism; 20-pole piece; 30-isolating film. DETAILED DESCRIPTION

[0077] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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" and "second" 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-secondary relationship.

[0079] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0080] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0081] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0082] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0083] The term "plurality" used in this application refers to two or more (including two).

[0084] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0085] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0086] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive active material layer protrudes from the positive electrode collector coated with the positive active material layer, and the positive electrode collector not coated with the positive active material layer serves as the positive tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative active material layer protrudes from the negative electrode collector coated with the negative active material layer, and the negative electrode collector not coated with the negative active material layer serves as the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0087] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0088] Batteries include electrode assemblies, which are the components in the battery where electrochemical reactions occur. Electrode assemblies include wound electrode assemblies and laminated electrode assemblies. Currently, wound electrode assemblies are relatively expensive to produce.

[0089] For the production of wound electrode assemblies, the existing technology generally unwinds the pole pieces and the isolation membrane through an unwinding mechanism, and winds the pole pieces and the isolation membrane through the winding mechanism to form a wound electrode assembly. The electrode assemblies that do not meet the design requirements will be discarded, resulting in waste of the entire electrode assembly, thereby making the production cost of the wound motor assembly higher.

[0090] In view of this, an embodiment of the present application provides a winding device, comprising a first reeling and unreeling mechanism, a second reeling and unreeling mechanism, and a winding mechanism. The first reeling and unreeling mechanism is used to reel in or unreel the electrode sheet, and the second reeling and unreeling mechanism is used to reel in or unreel the separator. The winding mechanism is configured to: when the first and second reeling and unreeling mechanisms are unwinding, the electrode sheet and the separator can be wound; when the first and second reeling and unreeling mechanisms are rewinding, the electrode sheet and the separator can be unwound.

[0091] During normal winding, the first reel-and-unreel mechanism unwinds the electrode sheet, and the second reel-and-unreel mechanism unwinds the separator. The electrode sheet unwound by the first reel-and-unreel mechanism and the separator unwound by the second reel-and-unreel mechanism are then wound together to form an electrode assembly. If the wound electrode assembly is found to not meet design requirements, the first reel-and-unreel mechanism rewinds the electrode sheet, and the second reel-and-unreel mechanism rewinds the separator, unwinding the electrode assembly wound by the winding mechanism. After manual or automatic correction, the first reel-and-unreel mechanism unwinds the electrode sheet, and the second reel-and-unreel mechanism unwinds the separator. The winding mechanism then rewinds the electrode assembly, ensuring that the rewound electrode assembly meets design requirements, eliminating waste of the entire electrode assembly and reducing production costs.

[0092] The technical solution described in the embodiments of the present application is applicable to the manufacture of wound electrode assemblies, which is beneficial to reducing production costs.

[0093] Please refer to Figure 1, which is a schematic diagram of the structure of a winding device 10 provided in some embodiments of the present application. The embodiments of the present application provide a winding device 10, which includes a first rewinding and unwinding mechanism 100, a second rewinding and unwinding mechanism 200, and a winding mechanism 300. The first rewinding and unwinding mechanism 100 is used to rewind or unwind the pole piece 20, and the second rewinding and unwinding mechanism 200 is used to rewind or unwind the isolation film 30. The winding mechanism 300 is configured to: be able to wind the pole piece 20 and the isolation film 30 when the first rewinding and unwinding mechanism 100 and the second rewinding and unwinding mechanism 200 are unwinding, and be able to unwind the pole piece 20 and the isolation film 30 when the first rewinding and unwinding mechanism 100 and the second rewinding and unwinding mechanism 200 are rewinding.

[0094] The first reeling and unreeling mechanism 100 is a mechanism for reeling in or unreeling the electrode sheet 20. The electrode sheet 20 can be a positive electrode sheet or a negative electrode sheet. Generally speaking, the winding device 10 includes at least two first reeling and unreeling mechanisms 100, at least one first reeling and unreeling mechanism 100 is used to reel in or unreel the negative electrode sheet, and at least one first reeling and unreeling mechanism 100 is used to reel in or unreel the positive electrode sheet. Please refer to Figure 1. In the embodiment shown in Figure 1, the winding device 10 includes two first reeling and unreeling mechanisms 100, one of the first reeling and unreeling mechanisms 100 is used to reel in or unreel the negative electrode sheet, and the other first reeling and unreeling mechanism 100 is used to reel in or unreel the positive electrode sheet.

[0095] Optionally, the first rewinding and unwinding mechanism 100 includes a first rewinding and unwinding roller 110 and a first driving member. The first rewinding and unwinding roller 110 is used to set the pole piece material roll. The first driving member is connected to the first rewinding and unwinding roller 110 and is used to drive the first rewinding and unwinding roller 110 to rotate forward or reverse. When the first driving member drives the first rewinding and unwinding roller 110 to rotate forward, the first rewinding and unwinding roller 110 unwinds the pole piece 20. When the first driving member drives the first rewinding and unwinding roller 110 to rotate reversely, the first rewinding and unwinding roller 110 rewinds the pole piece 20.

[0096] The second rewinding and unwinding mechanism 200 is a mechanism for rewinding or unwinding the isolation membrane 30. The isolation membrane 30 is arranged between the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet and the negative electrode sheet to reduce the risk of short circuit between the positive electrode sheet and the negative electrode sheet. The isolation membrane 30 has a large number of through-holes, which can ensure the free passage of electrolyte ions and has good permeability to metal ions. Please refer to Figure 1. In the embodiment shown in Figure 1, the winding device 10 includes two second rewinding and unwinding mechanisms 200. Along the winding direction of the winding mechanism 300, the negative electrode sheet, the isolation membrane 30 unwound by one second rewinding and unwinding mechanism 200, the positive electrode sheet, and the isolation membrane 30 unwound by another rewinding and unwinding mechanism are stacked in sequence and enter the winding mechanism 300.

[0097] Optionally, the second rewinding and unwinding mechanism 200 includes a second rewinding and unwinding roller 210 and a second driving member. The second rewinding and unwinding roller 210 is used to set the release film roll. The second driving member is connected to the second rewinding and unwinding roller 210 and is used to drive the second rewinding and unwinding roller 210 to rotate forward or reverse. When the second driving member drives the second rewinding and unwinding roller 210 to rotate forward, the second rewinding and unwinding roller 210 unwinds the release film 30. When the second driving member drives the second rewinding and unwinding roller 210 to rotate reversely, the second rewinding and unwinding roller 210 rewinds the release film 30.

[0098] Please refer to Figure 1. In the embodiment shown in Figure 1, the winding device 10 includes two first rewinding and unwinding mechanisms 100 and two second rewinding and unwinding mechanisms 200. Along the winding direction of the winding mechanism 300, a first rewinding and unwinding mechanism 100, a second rewinding and unwinding mechanism 200, another first rewinding and unwinding mechanism 100 and another second rewinding and unwinding mechanism 200 are arranged in sequence.

[0099] The winding mechanism 300 is a mechanism for winding the electrode sheet 20 and the separator 30 to form an electrode assembly. Generally speaking, the winding mechanism 300 includes a winding needle, and the electrode sheet 20 and the separator 30 are wound by the winding needle to form the electrode assembly. In the embodiment of the present application, the winding needle can rotate forward or reverse. When the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 unwinds the separator 30, the winding needle can rotate forward, thereby winding the electrode sheet 20 and the separator 30. When the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 rewinds the separator 30, the winding needle can reverse, thereby unwinding the wound electrode sheet 20 and the separator 30.

[0100] It should be noted that whether the electrode assembly wound by the winding mechanism 300 meets the design requirements can be determined manually or by a detection mechanism. If the electrode assembly wound by the winding mechanism 300 does not meet the design requirements, the first and second winding and unwinding mechanisms 100 and 200 can be controlled manually or by a controller to rewind.

[0101] During normal winding, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 unwinds the separator 30. The electrode sheet 20 unwound by the first rewinding and unwinding mechanism 100 and the separator 30 unwound by the second rewinding and unwinding mechanism 200 are then wound together to form an electrode assembly. When it is found that the wound electrode assembly does not meet the design requirements, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 rewinds the separator 30, so that the electrode assembly wound by the winding mechanism 300 is unwound. After manual or automatic correction, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 unwinds the separator 30, and the electrode assembly is rewound by the winding mechanism 300. This ensures that the rewound electrode assembly meets the design requirements, avoids wasting the entire electrode assembly, and thus reduces production costs.

[0102] Please refer to Figure 2, which is a schematic diagram of the structure of the winding device 10 provided in other embodiments of the present application. The winding device 10 also includes a first bidirectional smoothing mechanism 400, which is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. The first bidirectional smoothing mechanism 400 is configured to smooth the electrode 20 when the first reeling and unreeling mechanism 100 is reeling or unreeling.

[0103] The first bidirectional smoothing mechanism 400 is located downstream of the first rewinding and unwinding mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the electrode 20, the first bidirectional smoothing mechanism 400 is disposed between the first rewinding and unwinding mechanism 100 and the winding mechanism 300.

[0104] The first bidirectional smoothing mechanism 400 is used to smooth the electrode sheet 20 when the first rewinding and unwinding mechanism 100 is rewinding, and the first bidirectional smoothing mechanism 400 is also used to smooth the electrode sheet 20 when the first rewinding and unwinding mechanism 100 is unwinding. In other words, the first bidirectional smoothing mechanism 400 can smooth the electrode sheet 20 when the electrode sheet 20 is transported in the forward direction, and can also smooth the electrode sheet 20 when the electrode sheet 20 is transported in the reverse direction, thereby achieving bidirectional smoothing of the electrode sheet 20 during transportation.

[0105] The pole piece 20 includes a pole tab, and the first bidirectional smoothing mechanism 400 can also smooth the pole tab, reducing the risk of the pole tab being folded, folded, wrinkled, and other problems.

[0106] When the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, the first bidirectional smoothing mechanism 400 can smooth the electrode sheet 20 unwound by the first rewinding and unwinding mechanism 100, reducing the risk of wrinkling the electrode sheet 20, which helps ensure that the electrode assembly wound by the winding mechanism 300 meets the design requirements. When the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, the electrode assembly wound by the winding mechanism 300 is unwound. The first bidirectional smoothing mechanism 400 can smooth the electrode sheet 20 unwound by the winding mechanism 300, reducing the risk of wrinkling the electrode sheet 20, allowing the electrode sheet 20 to be smoothly rewound to the first rewinding and unwinding mechanism 100, thereby facilitating rewinding.

[0107] Please refer to Figures 2 and 3. Figure 3 is a schematic diagram of the structure of a first bidirectional smoothing mechanism 400 provided in some embodiments of the present application. In some embodiments, the first bidirectional smoothing mechanism 400 includes a roller 410 and a first smoothing member 420. A first gap 430 is defined between the first smoothing member 420 and the roller 410. The first gap 430 is used to allow the electrode 20 to pass through. The first smoothing member 420 and the roller 410 cooperate to smooth the electrode 20.

[0108] The roller 410 is used to wind the electrode sheet 20. A first smoothing member 420 is spaced apart from the roller 410, forming a first gap 430 between the first smoothing member 420 and the roller 410. The first gap 430 is used to allow the electrode sheet 20 to pass through. As the electrode sheet 20 passes through the first gap 430, the first smoothing member 420 and the roller 410 cooperate to smooth the electrode sheet 20.

[0109] When the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, the electrode sheet 20 can pass through the first gap 430 formed between the first smoothing member 420 and the roller 410 in the forward direction and be smoothed by the first smoothing member 420 and the roller 410, thereby reducing the risk of wrinkling the electrode sheet 20. When the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, the electrode assembly wound by the winding mechanism 300 is unwound, and the electrode sheet 20 can pass through the first gap 430 formed between the first smoothing member 420 and the roller 410 in the reverse direction and be smoothed by the first smoothing member 420 and the roller 410, thereby reducing the risk of wrinkling the electrode sheet 20.

[0110] 2 and 3 , in some embodiments, the first smoothing member 420 includes a first smoothing portion 421, a first guide portion 422, and a second guide portion 423. A first gap 430 is formed between the first smoothing portion 421 and the outer circumferential surface of the roller 410. The first guide portion 422 and the second guide portion 423 are respectively connected to either side of the first smoothing portion 421 along the conveying direction of the electrode sheet 20. The first guide portion 422 is configured to guide the electrode sheet 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is unwinding, and the second guide portion 423 is configured to guide the electrode sheet 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is rewinding.

[0111] A first gap 430 is formed between the first smoothing portion 421 and the outer circumference of the roller 410 . Along the conveying direction of the pole piece 20 , the first guide portion 422 is connected to one end of the first smoothing portion 421 , and the second guide portion 423 is connected to the other end of the first smoothing portion 421 .

[0112] The first guide portion 422 and the second guide portion 423 are respectively used to guide the electrode piece 20 into the first gap 430 when the electrode piece 20 is transported in the forward direction and the reverse direction, so as to smooth the electrode piece 20 .

[0113] The first guide portion 422 is configured to guide the electrode sheet 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is unwinding, thereby achieving positive smoothing of the electrode sheet 20. The second guide portion 423 is configured to guide the electrode sheet 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is rewinding, thereby achieving negative smoothing of the electrode sheet 20. In this way, regardless of whether the first rewinding and unwinding mechanism 100 is rewinding or unwinding, the electrode sheet 20 can be smoothed, reducing the risk of wrinkling of the electrode sheet 20 and facilitating rewinding by the winding mechanism 300.

[0114] 2 and 3 , in some embodiments, the first guide portion 422 and the second guide portion 423 are bent in a direction away from the roller 410 compared to the first smoothing portion 421 .

[0115] The first guide portion 422 is bent away from the roller 410 compared to the first smoothing portion 421. The first guide portion 422 can extend along a straight line or an arc. The connection between the first guide portion 422 and the first smoothing portion 421 can be rounded to reduce stress on the electrode 20.

[0116] Similarly, the second guide portion 423 is bent away from the roller 410 relative to the first smoothing portion 421. The second guide portion 423 can extend along a straight path or an arc path. The connection between the second guide portion 423 and the first smoothing portion 421 can adopt a rounded transition to reduce stress on the electrode sheet 20.

[0117] By bending the first guide portion 422 away from the roller 410 relative to the first smoothing portion 421, the electrode piece 20 is guided into the first gap 430 when the first rewinding and unwinding mechanism 100 is unwinding, thereby achieving positive smoothing of the electrode piece 20. By bending the second guide portion 423 away from the roller 410 relative to the first smoothing portion 421, the electrode piece 20 is guided into the first gap 430 when the first rewinding and unwinding mechanism 100 is rewinding, thereby achieving negative smoothing of the electrode piece 20.

[0118] 2 and 3 , in some embodiments, the first guide portion 422 and the second guide portion 423 extend along an arc trajectory.

[0119] The first guide portion 422 and the second guide portion 423 both extend along an arc trajectory, so that the first guide portion 422 and the second guide portion 423 are relatively smooth and have a smooth transition, which can reduce the stress on the pole piece 20 and reduce the risk of damage to the pole piece 20.

[0120] 3 , in some embodiments, the first smoothing portion 421 extends along a straight line. In this case, the first smoothing portion 421 may be a flat plate structure.

[0121] When the first smoothing portion 421 extends along a straight line, the length of the first gap 430 is short, the pole piece 20 can quickly pass through the first gap 430 , the external force applied to the pole piece 20 is small, and the risk of damage to the pole piece 20 is small.

[0122] Please refer to Figure 4, which is a schematic structural diagram of a first bidirectional smoothing mechanism 400 provided in some other embodiments of the present application. In some other embodiments, the first smoothing portion 421 extends along an arc trajectory, and the center of the arc trajectory is located on the axis of the roller 410.

[0123] The first smoothing portion 421 extends along a circular arc, with a cross-section that is arc-shaped. The axis of the roller 410 passes through the center of the arc. In other words, when the first smoothing portion 421 extends along the arc, it can surround the outside of the roller 410. Referring to Figure 4 , in the embodiment shown in Figure 4 , the first smoothing portion 421 semi-encloses the roller 410.

[0124] When the first smoothing portion 421 extends along the arc trajectory and the center of the arc trajectory is located on the axis of the roller 410, the length of the first gap 430 is longer, the smoothing effect on the pole piece 20 is better, and the pole piece 20 can be bent, thereby changing the running direction.

[0125] Referring to FIG. 2 , in some embodiments, the winding device 10 includes a plurality of first bidirectional smoothing mechanisms 400 , and the plurality of first bidirectional smoothing mechanisms 400 are arranged along the conveying direction of the pole piece 20 .

[0126] The winding device 10 may include two first bidirectional smoothing mechanisms 400 , three first bidirectional smoothing mechanisms 400 , four first bidirectional smoothing mechanisms 400 , or more than four first bidirectional smoothing mechanisms 400 .

[0127] One first rewinding and unwinding mechanism 100 can be provided corresponding to a plurality of first bidirectional smoothing mechanisms 400 , so as to guide the pole piece 20 to the winding mechanism 300 , or guide the pole piece 20 unwound by the winding mechanism 300 to the first rewinding and unwinding mechanism 100 .

[0128] By arranging a plurality of first bidirectional smoothing mechanisms 400 along the conveying direction of the pole piece 20 , the smoothing effect on the pole piece 20 is enhanced, the risk of wrinkling of the pole piece 20 is reduced, and the quality of the wound pole piece 20 is improved.

[0129] In some embodiments, the winding device 10 may further be provided with a roller 410 for winding the isolation film 30 , so as to guide the isolation film 30 from the first unwinding mechanism 100 to the winding mechanism 300 , or from the winding mechanism 300 to the first unwinding mechanism 100 .

[0130] Optionally, each roller 410 is provided with a first smoothing member 420 to achieve bidirectional smoothing of the isolation film 30. In other words, a bidirectional smoothing mechanism can also be provided corresponding to the second rewinding and unwinding mechanism 200 to smooth the isolation film 30 in both directions.

[0131] Please refer to Figure 5, which is a schematic diagram of the structure of the winding device 10 provided in some embodiments of the present application. In some embodiments, the winding device 10 includes a first conveying mechanism 500, which is located downstream of the first rewinding and unwinding mechanism 100 and upstream of the winding mechanism 300. The first conveying mechanism 500 is used to convey the electrode 20 in a forward or reverse direction.

[0132] The first conveying mechanism 500 is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the electrode sheet 20, the first conveying mechanism 500 is disposed between the first reeling and unreeling mechanism 100 and the winding mechanism 300.

[0133] The first conveying mechanism 500 is used to convey the electrode sheet 20 in a forward or reverse direction. The first conveying mechanism 500 can have a cooperative relationship with the first reel-and-wind mechanism 100. For example, when the first reel-and-wind mechanism 100 is unwinding, the first conveying mechanism 500 conveys the electrode sheet 20 in a forward direction. When the first reel-and-wind mechanism 100 is rewinding, the first conveying mechanism 500 conveys the electrode sheet 20 in a reverse direction.

[0134] The first conveying mechanism 500 provides sufficient power for forward or reverse conveying of the electrode sheet 20, thereby accelerating the conveying speed of the electrode sheet 20, especially when the conveying path of the electrode sheet 20 is long. In addition, the first conveying mechanism 500 can form a tension barrier, thereby balancing the tension of the electrode sheet 20 during conveyance, reducing the risk of the electrode sheet 20 breaking due to excessive tension.

[0135] Please refer to Figures 5 and 6. Figure 6 is a schematic diagram of the structure of a first conveying mechanism 500 provided in some embodiments of the present application. In some embodiments, the first conveying mechanism 500 includes a first driven roller 520 and a first active roller 510. A second gap 511 is defined between the first active roller 510 and the first driven roller 520. The second gap 511 is used to allow the electrode sheet 20 to pass through. The first active roller 510 is configured to rotate forward or reverse to cooperate with the first driven roller 520 to convey the electrode sheet 20 in the forward or reverse direction.

[0136] The first active roller 510 can actively rotate under the action of a driving mechanism to actively transport the pole piece 20. The first driven roller 520 has no driving mechanism and cannot actively rotate, but can rotate under the action of the pole piece 20.

[0137] The first active roller 510 and the first driven roller 520 are spaced apart, and a second gap 511 is formed between the first active roller 510 and the first driven roller 520. The second gap 511 is used to allow the pole piece 20 to pass through. In other words, along the thickness direction of the pole piece 20, the first active roller 510 and the first driven roller 520 are respectively located on both sides of the pole piece 20.

[0138] The first active roller 510 can rotate forward to cooperate with the first driven roller 520 to transport the electrode piece 20 in a forward direction. The first active roller 510 can rotate backward to cooperate with the first driven roller 520 to transport the electrode piece 20 in a reverse direction.

[0139] A second gap 511 is defined between the first active roller 510 and the first driven roller 520, through which the electrode piece 20 can pass. When the first active roller 510 rotates in the forward direction, the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the forward direction. When the first active roller 510 rotates in the reverse direction, the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the reverse direction.

[0140] 5 and 6 , in some embodiments, the first conveying mechanism 500 further includes a second bidirectional smoothing mechanism, which is disposed upstream and / or downstream of the first active roller 510. The second bidirectional smoothing mechanism is configured to smooth the electrode sheet 20 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode sheet 20 in a forward or reverse direction.

[0141] The second bidirectional smoothing mechanism is used to smooth the electrode piece 20 when the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the forward direction. The second bidirectional smoothing mechanism is also used to smooth the electrode piece 20 when the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the reverse direction.

[0142] The second bidirectional smoothing mechanism may be provided only upstream of the first active roller 510, only downstream of the first active roller 510, or both upstream and downstream of the first active roller 510. Referring to FIG5 , in the embodiment shown in FIG5 , the second bidirectional smoothing mechanism is provided both upstream and downstream of the first active roller 510.

[0143] By arranging a second bidirectional smoothing mechanism upstream and / or downstream of the first active roller 510, the pole piece 20 is smoothed before passing through the second gap 511, thereby reducing the risk of wrinkled pole ears entering the second gap 511. In this way, the pole piece 20 is not easily damaged by the cooperation of the first active roller 510 and the first driven roller 520.

[0144] 5 and 6 , in some embodiments, the second bidirectional smoothing mechanism includes two second smoothing members 530 with a third gap 540 between them. The third gap 540 is used for the pole piece 20 to pass through, and the two second smoothing members 530 cooperate to smooth the pole piece 20.

[0145] The two second smoothing members 530 are spaced apart, forming a third gap 540 between the two second smoothing members 530. The third gap 540 is used to allow the pole piece 20 to pass through. In other words, along the thickness direction of the pole piece 20, the two second smoothing members 530 are located on either side of the pole piece 20. As the pole piece 20 passes through the third gap 540, the two second smoothing members 530 cooperate to smooth the pole piece 20.

[0146] When the first active roller 510 rotates forward, the electrode sheet 20 can pass through the third gap 540 formed between the two second smoothing members 530 in the forward direction and be smoothed by the two second smoothing members 530, thereby reducing the risk of wrinkling the electrode sheet 20. When the first active roller 510 rotates reversely, the electrode assembly wound by the winding mechanism 300 is unwound, and the electrode sheet 20 can pass through the third gap 540 formed between the two second smoothing members 530 in the reverse direction and be smoothed by the two second smoothing members 530, thereby reducing the risk of wrinkling the electrode sheet 20.

[0147] 5 and 6 , in some embodiments, the second smoothing member 530 includes a second smoothing portion 531, a third guide portion 532, and a fourth guide portion 533, and a third gap 540 is formed between the second smoothing portions 531 of the two second smoothing members 530. Along the conveying direction of the electrode 20, the third guide portion 532 and the fourth guide portion 533 are respectively connected to the two sides of the second smoothing portion 531. The third guide portion 532 is configured to guide the electrode 20 to the third gap 540 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode 20 in the forward direction, and the fourth guide portion 533 is configured to guide the electrode 20 to the third gap 540 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode 20 in the reverse direction.

[0148] A third gap 540 is formed between the second smoothing portion 531 of one second smoothing member 530 and the second smoothing portion 531 of the corresponding second smoothing member 530. Along the conveying direction of the electrode 20, the third guide portion 532 is connected to one end of the second smoothing portion 531, and the fourth guide portion 533 is connected to the other end of the second smoothing portion 531.

[0149] The third guide portion 532 and the fourth guide portion 533 are respectively used to guide the electrode piece 20 into the third gap 540 when the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the forward direction and the first active roller 510 and the first driven roller 520 cooperate to transport the electrode piece 20 in the reverse direction, thereby smoothing the electrode piece 20.

[0150] The third guide portion 532 is configured to guide the electrode sheet 20 to the third gap 540 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode sheet 20 in the forward direction, thereby achieving forward smoothing of the electrode sheet 20. The fourth guide portion 533 is configured to guide the electrode sheet 20 to the third gap 540 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode sheet 20 in the reverse direction, thereby achieving reverse smoothing of the electrode sheet 20. In this way, regardless of whether the first active roller 510 rotates forward or reverse, the electrode sheet 20 can be smoothed, reducing the risk of wrinkling of the electrode sheet 20 and facilitating rewinding of the winding mechanism 300.

[0151] 5 and 6 , in some embodiments, the third guide portion 532 and the fourth guide portion 533 of each second smoothing member 530 are bent in a direction away from the other second smoothing member 530 compared to the second smoothing portion 531 .

[0152] The third guide portion 532 of a second smoothing member 530 is bent away from the second smoothing member 531 of the second smoothing member 530, away from the corresponding second smoothing member 530. Alternatively, the third guide portion 532 may extend along a straight line or an arc. The connection between the third guide portion 532 and the second smoothing portion 531 may be rounded to reduce stress on the electrode 20.

[0153] Similarly, the fourth guide portion 533 of a second smoothing member 530 is bent away from the corresponding second smoothing member 530 relative to the second smoothing portion 531 of the second smoothing member 530. Alternatively, the fourth guide portion 533 may extend along a straight line or an arc. The connection between the fourth guide portion 533 and the second smoothing portion 531 may be rounded to reduce stress on the electrode 20.

[0154] By bending the third guide portion 532 in a direction away from the other second smoothing member 530 relative to the second smoothing portion 531, the pole piece 20 is guided into the third gap 540 when the first active roller 510 rotates in the forward direction, thereby achieving forward smoothing of the pole piece 20. By bending the fourth guide portion 533 in a direction away from the other second smoothing member 530 relative to the second smoothing portion 531, the pole piece 20 is guided into the third gap 540 when the first active roller 510 rotates in the reverse direction, thereby achieving reverse smoothing of the pole piece 20.

[0155] 6 , in some embodiments, the third guide portion 532 and the fourth guide portion 533 extend along arc paths.

[0156] The third guide portion 532 and the fourth guide portion 533 both extend along an arc trajectory, so that the third guide portion 532 and the fourth guide portion 533 are relatively smooth and have a smooth transition, which can reduce the stress on the pole piece 20 and reduce the risk of damage to the pole piece 20.

[0157] 6 , in some embodiments, the second smoothing portion 531 extends along a straight line. In this case, the second smoothing portion 531 may be a flat plate structure.

[0158] When the second smoothing portion 531 extends along a straight line, the external force applied to the pole piece 20 is small, and the risk of the pole piece 20 being damaged is small.

[0159] In other embodiments, the second smoothing portion 531 extends along an arc trajectory, and the centers of the arc trajectories of the second smoothing portions 531 of the two second smoothing members 530 coincide with each other.

[0160] When the second smoothing portion 531 extends along the arc trajectory, the pole piece 20 can be bent, thereby changing the running direction.

[0161] 5 and 6 , in some embodiments, the winding device 10 includes a plurality of first conveying mechanisms 500 arranged along the conveying direction of the electrode sheet 20. Along the conveying direction of the electrode sheet 20, the first conveying mechanism 500 closest to the winding mechanism 300 is used to guide the electrode sheet 20 into the winding mechanism 300.

[0162] The winding device 10 may include two first conveying mechanisms 500 , three first conveying mechanisms 500 , four first conveying mechanisms 500 , or more than four first conveying mechanisms 500 . The plurality of first conveying mechanisms 500 are arranged along the conveying direction of the electrode sheet 20 .

[0163] Among them, along the conveying direction of the electrode sheet 20 , the first conveying mechanism 500 closest to the winding mechanism 300 among the plurality of first conveying mechanisms 500 can serve as an introduction mechanism to introduce the electrode sheet 20 into the winding mechanism 300 .

[0164] The first conveying mechanism 500 closest to the winding mechanism 300 can guide the electrode sheet 20 into the winding mechanism 300, further reducing the risk of wrinkling of the electrode sheet 20 wound by the winding mechanism 300, which is conducive to making the wound electrode assembly meet the design requirements and thereby reducing production costs.

[0165] Please refer to Figures 5 and 7. Figure 7 is a schematic diagram of the structure of the second conveying mechanism 600 provided in some embodiments of the present application. In some embodiments, the winding device 10 further includes a second conveying mechanism 600, which is located downstream of the second rewinding and unwinding mechanism 200 and upstream of the winding mechanism 300. The second conveying mechanism 600 is used to convey the isolation film 30 in a forward or reverse direction.

[0166] The second conveying mechanism 600 is located downstream of the second rewinding and unwinding mechanism 200 and upstream of the winding mechanism 300. In other words, along the conveying direction of the separator 30, the second conveying mechanism 600 is disposed between the second rewinding and unwinding mechanism 200 and the winding mechanism 300.

[0167] The second conveying mechanism 600 is used to convey the release film 30 in either a forward or reverse direction. The second conveying mechanism 600 can cooperate with the second reel-and-wind mechanism 200. For example, when the second reel-and-wind mechanism 200 is unwinding, the first conveying mechanism 500 conveys the release film 30 in a forward direction. When the second reel-and-wind mechanism 200 is rewinding, the second conveying mechanism 600 conveys the release film 30 in a reverse direction.

[0168] The second conveying mechanism 600 provides sufficient power for forward or reverse conveyance of the separator 30, accelerating the conveyance of the separator 30. This is particularly effective when the separator 30 is conveyed over a long path. Furthermore, the second conveying mechanism 600 creates a tension barrier, balancing the tension of the separator 30 during conveyance, reducing the risk of the separator 30 breaking due to excessive tension.

[0169] 5 and 7 , in some embodiments, the second conveying mechanism 600 includes a second driven roller 620 and a second active roller 610. A fourth gap 630 is defined between the second active roller 610 and the second driven roller 620. The fourth gap 630 is configured to allow the separator 30 to pass through. The second active roller 610 is configured to rotate forward or reverse to cooperate with the second driven roller 620 to convey the separator 30 in a forward or reverse direction.

[0170] The second active roller 610 can actively rotate under the action of the driving mechanism to actively transport the isolation film 30. The second driven roller 620 has no driving mechanism and cannot actively rotate, but can rotate under the action of the isolation film 30.

[0171] A gap is provided between the second active roller 610 and the second driven roller 620, and a fourth gap 630 is formed between the second active roller 610 and the second driven roller 620. The fourth gap 630 is used to allow the electrode sheet 20 to pass through. In other words, along the thickness direction of the isolation diaphragm 30, the second active roller 610 and the second driven roller 620 are respectively located on both sides of the isolation diaphragm 30.

[0172] The second driving roller 610 can rotate forward to cooperate with the second driven roller 620 to forwardly transport the separator 30 . The second driving roller 610 can rotate backward to cooperate with the second driven roller 620 to reversely transport the separator 30 .

[0173] A fourth gap 630 is defined between the second active roller 610 and the second driven roller 620, through which the separator 30 can pass. When the second active roller 610 rotates in the forward direction, the second active roller 610 and the second driven roller 620 cooperate to convey the separator 30 in the forward direction. When the second active roller 610 rotates in the reverse direction, the second active roller 610 and the second driven roller 620 cooperate to convey the separator 30 in the reverse direction.

[0174] Please refer to Figure 8, which is a schematic diagram of the structure of the winding device 10 provided in some further embodiments of the present application. In some further embodiments, the winding device 10 includes a first buffer mechanism 700, which is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. The first buffer mechanism 700 is used to buffer the pole piece 20.

[0175] The first buffer mechanism 700 is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the electrode 20, the first buffer mechanism 700 is disposed between the first reeling and unreeling mechanism 100 and the winding mechanism 300.

[0176] The first buffer mechanism 700 is used to buffer the electrode pieces 20. The electrode pieces 20 unwound by the first reeling and unwinding mechanism 100 can be buffered in the first buffer mechanism 700, and the electrode pieces 20 unwound by the winding mechanism 300 can also be buffered in the first buffer mechanism 700. The electrode pieces 20 buffered in the first buffer mechanism 700 can be provided to the first reeling and unwinding mechanism 100 or the winding mechanism 300.

[0177] In the initial stage of the winding device 10 startup, the first rewinding and unwinding mechanism 100 cannot unwind too quickly, otherwise it will easily cause the electrode 20 to break. By providing the first buffer mechanism 700, in the initial stage of the winding device 10 startup, the electrode 20 cached by the first buffer mechanism 700 can be quickly released and the electrode 20 can be supplied to the winding mechanism 300, while the first rewinding and unwinding mechanism 100 is slowly accelerated. This can speed up the production cycle and reduce production costs. In addition, when it is found that the wound electrode assembly does not meet the design requirements, the electrode assembly wound by the winding mechanism 300 can be unwound and the electrode 20 can be cached in the first buffer mechanism 700, without having to rewind it all into the first rewinding and unwinding mechanism 100. During rewinding, the electrode 20 cached in the first buffer mechanism 700 can be released. In this way, the path for the forward and reverse transport of the electrode 20 is shortened, which is conducive to reducing the rewinding time, accelerating the rewinding efficiency, and thus reducing production costs.

[0178] Please refer to Figures 8 and 9. Figure 9 is a schematic diagram of the structure of the first buffer mechanism 700 provided in some embodiments of the present application. In some embodiments, the first buffer mechanism 700 includes a first fixed roller set 710, a first movable roller set 720, and a first drive mechanism. The first fixed roller set 710 includes at least one first fixed roller 711, and the first movable roller set 720 includes at least one first movable roller 721. The first movable roller set 720 and the first fixed roller set 710 are arranged along a first direction, and the pole pieces 20 are alternately wound around the first fixed rollers 711 and the first movable rollers 721. The first drive mechanism is connected to the first movable roller 721 and is configured to drive the first movable roller 721 to move along the first direction.

[0179] The first fixed roller group 710 includes at least one first fixed roller 711 , and the first fixed roller 711 is fixed relative to the ground or the frame.

[0180] The first movable roller set 720 includes at least one first movable roller 721 . The first movable roller 721 is movable relative to the ground or the frame.

[0181] Along the first direction, the first fixed roller set 710 and the first movable roller set 720 are spaced apart. Correspondingly, the first fixed roller 711 and the first movable roller 721 are spaced apart along the first direction. Referring to FIG. 9 , the first direction may be direction A shown in the figure.

[0182] The pole piece 20 is alternately wound around the first fixed roller 711 and the first movable roller 721. Referring to FIG9 , in the embodiment shown in FIG9 , the first fixed roller group 710 includes three first fixed rollers 711, and the first movable roller group 720 includes two first movable rollers 721. The pole piece 20 is wound around the first fixed roller 711 and the first movable roller 721 in the order of the first first fixed roller 711, the first first movable roller 721, the second first fixed roller 711, the second first movable roller 721, and the third first fixed roller 711.

[0183] A first drive mechanism is connected to the first movable roller 721 and is configured to drive the first movable roller 721 to move in a first direction. The first drive mechanism may include a linear drive element connected to the first movable roller 721 and configured to drive the first movable roller 721 to move in the first direction. The linear drive element may be a linear electric cylinder, a linear pneumatic cylinder, a linear oil cylinder, or the like. The first drive mechanism may also include a rotational drive element and a transmission mechanism. The rotational drive element is connected to the first movable roller 721 via the transmission mechanism, and the transmission mechanism converts the rotational motion output by the rotational drive element into linear motion of the first movable roller 721 in the first direction. The rotational drive element may be a motor, an internal combustion engine, or the like. The transmission mechanism may be a slider-crank mechanism, a screw-nut mechanism, or the like.

[0184] The pole piece 20 is alternately wound around the first fixed roller 711 and the first movable roller 721. When the pole piece 20 needs to be cached, the first driving mechanism can drive the first movable roller 721 away from the first fixed roller 711 in the first direction, thereby increasing the distance between the first movable roller 721 and the first fixed roller 711 to cache the pole piece 20. When the pole piece 20 needs to be released, the first driving mechanism can drive the first movable roller 721 toward the first fixed roller 711 in the first direction, thereby reducing the distance between the first movable roller 721 and the first fixed roller 711 to release the pole piece 20.

[0185] Referring to FIG. 9 , in some embodiments, the first fixed roller assembly 710 includes a plurality of first fixed rollers 711 spaced apart along the second direction. And / or the first movable roller assembly 720 includes a plurality of first movable rollers 721 spaced apart along the second direction. The second direction intersects the first direction.

[0186] The angle between the second direction and the first direction can be an acute angle, or a right angle. Referring to FIG9 , in the embodiment shown in FIG9 , the second direction is direction B as shown in the figure. In this case, the second direction is perpendicular to the first direction.

[0187] The first fixed roller group 710 may include two first fixed rollers 711, three first fixed rollers 711, four first fixed rollers 711, or more than four first fixed rollers 711. The plurality of first fixed rollers 711 are spaced apart along the second direction.

[0188] The first movable roller group 720 may include two first movable rollers 721, three first movable rollers 721, four first movable rollers 721, or more than four first movable rollers 721. The plurality of first movable rollers 721 are spaced apart along the second direction.

[0189] By providing a plurality of first fixed rollers 711 and a plurality of first movable rollers 721 , the pole pieces 20 are alternately passed around the first fixed rollers 711 and the first movable rollers 721 , thereby increasing the length of the buffered pole pieces 20 .

[0190] Referring to FIG8 , in some embodiments, the winding device 10 includes a first conveying mechanism 500 and a first buffer mechanism 700. The first conveying mechanism 500 is used to convey the electrode sheet 20 in a forward or reverse direction. The first buffer mechanism 700 is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. The first buffer mechanism 700 is used to buffer the electrode sheet 20. The first conveying mechanism 500 is provided both upstream and downstream of the first buffer mechanism 700.

[0191] The first conveying mechanism 500 is used to convey the electrode sheet 20 in a forward or reverse direction. The first conveying mechanism 500 can have a cooperative relationship with the first reel-and-wind mechanism 100. For example, when the first reel-and-wind mechanism 100 is unwinding, the first conveying mechanism 500 conveys the electrode sheet 20 in a forward direction. When the first reel-and-wind mechanism 100 is rewinding, the first conveying mechanism 500 conveys the electrode sheet 20 in a reverse direction.

[0192] The first buffer mechanism 700 is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the electrode sheet 20, the first buffer mechanism 700 is disposed between the first reeling and unreeling mechanism 100 and the winding mechanism 300. The first buffer mechanism 700 is used to buffer the electrode sheet 20. The electrode sheet 20 unwound by the first reeling and unreeling mechanism 100 can be buffered in the first buffer mechanism 700, and the electrode sheet 20 unwound by the winding mechanism 300 can also be buffered in the first buffer mechanism 700. The electrode sheet 20 buffered in the first buffer mechanism 700 can be provided to the first reeling and unreeling mechanism 100 or the winding mechanism 300.

[0193] A first conveying mechanism 500 is provided upstream of the first buffer mechanism 700 , and a first conveying mechanism 500 is also provided downstream of the first buffer mechanism 700 .

[0194] By arranging the first conveying mechanism 500 upstream and / or downstream of the first cache mechanism 700, it is convenient for the first conveying mechanism 500 to provide the electrode 20 to the first cache mechanism 700 for cache, and the electrode 20 can be quickly output when the first cache mechanism 700 releases the electrode 20.

[0195] Please refer to Figures 8 and 10. Figure 10 is a schematic diagram of the structure of a second buffer mechanism 800 provided in some embodiments of the present application. In some embodiments, the winding device 10 includes a second buffer mechanism 800, which is located downstream of the second rewinding and unwinding mechanism 200 and upstream of the winding mechanism 300. The second buffer mechanism 800 is used to buffer the isolation film 30.

[0196] The second buffer mechanism 800 is located downstream of the second rewinding and unwinding mechanism 200 and upstream of the winding mechanism 300. In other words, along the conveying direction of the separator 30, the second buffer mechanism 800 is disposed between the second rewinding and unwinding mechanism 200 and the winding mechanism 300.

[0197] The second buffer mechanism 800 is used to buffer the separator 30. The separator 30 unwound by the second rewinding and unwinding mechanism 200 can be buffered in the second buffer mechanism 800, and the separator 30 unwound by the winding mechanism 300 can also be buffered in the second buffer mechanism 800. The separator 30 buffered in the second buffer mechanism 800 can be provided to the second rewinding and unwinding mechanism 200 or the winding mechanism 300.

[0198] During the initial startup of the winding device 10, the second rewinding and unwinding mechanism 200 cannot unwind too quickly, otherwise the separator 30 may break. By providing a second buffer mechanism 800, during the initial startup of the winding device 10, the separator 30 cached in the second buffer mechanism 800 can be quickly released and supplied to the winding mechanism 300, while the second rewinding and unwinding mechanism 200 is slowly accelerated. This can speed up the production cycle and reduce production costs. In addition, if it is found that the wound electrode assembly does not meet the design requirements, the electrode assembly wound by the winding mechanism 300 can be unwound and the separator 30 can be cached in the second buffer mechanism 800, without having to rewind it all into the second rewinding and unwinding mechanism 200. During rewinding, the separator 30 cached in the second buffer mechanism 800 can be released. In this way, the forward and reverse transport paths of the separator 30 are shortened, which helps to reduce rewinding time, increase rewinding efficiency, and thus reduce production costs.

[0199] Referring to Figures 8 and 10 , in some embodiments, the second buffer mechanism 800 includes a second fixed roller set 810, a second movable roller set 820, and a second drive mechanism. The second fixed roller set 810 includes at least one second fixed roller 811, and the second movable roller set 820 includes at least one second movable roller 821. The second movable roller set 820 and the second fixed roller set 810 are arranged along a third direction, and the isolation film 30 is alternately wound around the second fixed roller 811 and the second movable roller 821. The second drive mechanism is connected to the second movable roller 821 and is configured to drive the second movable roller 821 to move along the third direction.

[0200] The second fixed roller group 810 includes at least one second fixed roller 811 , and the second fixed roller 811 is fixed relative to the ground or the frame.

[0201] The second movable roller set 820 includes at least one second movable roller 821 . The second movable roller 821 is movable relative to the ground or the frame.

[0202] Along the third direction, the second fixed roller group 810 and the second movable roller group 820 are spaced apart. Correspondingly, the second fixed roller 811 and the second movable roller 821 are spaced apart along the third direction. Referring to FIG. 10 , the third direction may be direction C as shown in the figure.

[0203] The isolation film 30 is alternately wound around the second fixed rollers 811 and the second movable rollers 821. Referring to FIG10 , in the embodiment shown in FIG10 , the second fixed roller assembly 810 includes three second fixed rollers 811, and the second movable roller assembly 820 includes two second movable rollers 821. The isolation film 30 is sequentially wound around the second fixed rollers 811 and the second movable rollers 821 in the order of the first second fixed roller 811, the first second movable roller 821, the second second fixed roller 811, the second second movable roller 821, and the third second fixed roller 811.

[0204] A second drive mechanism is connected to the second movable roller 821 and is configured to drive the second movable roller 821 to move along the third direction. The second drive mechanism may include a linear drive member connected to the second movable roller 821 and configured to drive the second movable roller 821 to move along the third direction. The linear drive member may be a linear electric cylinder, a linear pneumatic cylinder, a linear oil cylinder, or the like. The second drive mechanism may also include a rotational drive member and a transmission mechanism. The rotational drive member is connected to the second movable roller 821 via the transmission mechanism, and the transmission mechanism converts the rotational motion output by the rotational drive member into linear motion of the second movable roller 821 along the third direction. The rotational drive member may be a motor, an internal combustion engine, or the like. The transmission mechanism may be a crank slider mechanism, a screw-nut mechanism, or the like.

[0205] The isolation film 30 is alternately wound around the second fixed roller 811 and the second movable roller 821. When the isolation film 30 needs to be buffered, the second driving mechanism can drive the second movable roller 821 away from the second fixed roller 811 in the third direction, thereby increasing the distance between the second movable roller 821 and the second fixed roller 811 to achieve buffering of the isolation film 30. When the isolation film 30 needs to be released, the second driving mechanism can drive the second movable roller 821 toward the second fixed roller 811 in the third direction, thereby decreasing the distance between the second movable roller 821 and the second fixed roller 811 to achieve release of the isolation film 30.

[0206] Referring to Figures 8 and 10 , in some embodiments, the second fixed roller assembly 810 includes a plurality of second fixed rollers 811 spaced apart along a fourth direction. And / or the second movable roller assembly 820 includes a plurality of second movable rollers 821 spaced apart along a fourth direction. The fourth direction intersects the third direction.

[0207] The angle between the fourth direction and the third direction can be an acute angle or a right angle. Referring to FIG. 10 , in the embodiment shown in FIG. 10 , the fourth direction is direction D as shown in the figure. In this case, the fourth direction is perpendicular to the third direction.

[0208] The second fixed roller group 810 may include two second fixed rollers 811, three second fixed rollers 811, four second fixed rollers 811, or more than four second fixed rollers 811. The plurality of second fixed rollers 811 are spaced apart along the fourth direction.

[0209] The second movable roller group 820 may include two second movable rollers 821, three second movable rollers 821, four second movable rollers 821, or more than four second movable rollers 821. The plurality of second movable rollers 821 are spaced apart along the fourth direction.

[0210] By providing a plurality of second fixed rollers 811 and a plurality of second movable rollers 821 , the separator 30 is allowed to alternately pass around the second fixed rollers 811 and the second movable rollers 821 , thereby increasing the length of the buffered separator 30 .

[0211] Please refer to Figure 11, which is a schematic block diagram of the connection between a first detection mechanism 910 and a first reeling and unreeling mechanism 100, according to some embodiments of the present application. In some embodiments, the winding device 10 includes a first detection mechanism 910, which is used to detect the misalignment of the tabs of the pole piece 20 wound around the winding mechanism 300. The first reeling and unreeling mechanism 100 and the second reeling and unreeling mechanism 200 are responsive to the first detection mechanism 910.

[0212] The first detection mechanism 910 is a mechanism for detecting the amount of misalignment of the tabs of the pole piece 20 wound on the winding mechanism 300. The amount of misalignment of the tabs refers to the amount of misalignment between the multiple tabs of a pole piece 20 after winding. After winding, when the two tabs of a pole piece 20 are aligned, the amount of misalignment of the tabs is 0. When the two tabs of a pole piece 20 are misaligned after winding, the amount of misalignment of the tabs is greater than 0. If the amount of misalignment of the tabs exceeds the threshold, the first rewinding and unwinding mechanism 100 rewinds the pole piece 20 in response to the first detection mechanism 910, and the second rewinding and unwinding mechanism 200 rewinds the isolation film 30 in response to the first detection mechanism 910.

[0213] In some embodiments, the first detection mechanism 910 includes an industrial camera. The first detection mechanism 910 obtains image information of the electrode assembly wound by the winding mechanism 300 by taking a photo, and obtains the tab misalignment of the electrode sheet 20 by analyzing the image information.

[0214] In other embodiments, the first detection mechanism 910 includes a laser beam sensor, which obtains the tab misalignment of the pole piece 20 by analyzing the duration that the tab blocks the laser beam sensor.

[0215] The first detection mechanism 910 can be directly electrically connected to the first rewinding and unwinding mechanism 100, or it can be indirectly electrically connected to the first rewinding and unwinding mechanism 100 through an intermediate component. For example, the winding device 10 includes a controller, the first detection mechanism 910 is electrically connected to the controller, and the controller is electrically connected to the first rewinding and unwinding mechanism 100. When the first detection mechanism 910 detects that the misalignment of the tab of the pole piece 20 is within a preset range, the controller controls the first rewinding and unwinding mechanism 100 to continue unwinding. When the first detection mechanism 910 detects that the misalignment of the tab of the pole piece 20 exceeds the preset range, the controller controls the first rewinding and unwinding mechanism 100 to start rewinding.

[0216] The first detection mechanism 910 can be directly electrically connected to the second reeling and unwinding mechanism 200, or it can be indirectly electrically connected to the second reeling and unwinding mechanism 200 through an intermediate component. For example, the winding device 10 includes a controller, the first detection mechanism 910 is electrically connected to the controller, and the controller is electrically connected to the second reeling and unwinding mechanism 200. When the first detection mechanism 910 detects that the misalignment of the tab of the pole piece 20 is within a preset range, the controller controls the second reeling and unwinding mechanism 200 to continue unwinding. When the first detection mechanism 910 detects that the misalignment of the tab of the pole piece 20 exceeds the preset range, the controller controls the second reeling and unwinding mechanism 200 to start rewinding.

[0217] The first detection mechanism 910 is provided to facilitate detection of the tab misalignment of the electrode sheet 20. When the first detection mechanism 910 detects that the tab misalignment of the electrode sheet 20 exceeds a threshold value, the first reeling and unreeling mechanism 100 reels the electrode sheet 20, and the second reeling and unreeling mechanism 200 reels the separator 30, so that the electrode assembly wound by the winding mechanism 300 is unwound. After manually or automatically correcting the tab misalignment, the first reeling and unreeling mechanism 100 unwinds the electrode sheet 20, and the second reeling and unreeling mechanism 200 unwinds the separator 30, and the winding mechanism 300 rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, avoids wasting the entire electrode assembly, and thus reduces production costs.

[0218] Referring to Figure 11, in some embodiments, the winding mechanism 300 includes a winding needle and an adjustment component 310. The winding needle is used to wind the pole piece 20 and the isolation film 30. The adjustment component 310 is used to adjust the winding radius of the winding needle. The adjustment component 310 responds to the first detection mechanism 910.

[0219] The winding mechanism 300 includes a winding needle, which winds the electrode sheet 20 and separator 30 to form an electrode assembly. In the embodiment of the present application, the winding needle can rotate forward or reverse. When the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 unwinds the separator 30, the winding needle can rotate forward, thereby winding the electrode sheet 20 and separator 30. When the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 rewinds the separator 30, the winding needle can rotate reversely, thereby unwinding the wound electrode sheet 20 and separator 30.

[0220] The adjustment component 310 can adjust the winding radius of the winding needle to correct the misalignment of the tab of the pole piece 20.

[0221] The first detection mechanism 910 can be directly electrically connected to the adjustment assembly 310, or can be indirectly electrically connected to the adjustment assembly 310 through an intermediate component. For example, the winding device 10 includes a controller, the first detection mechanism 910 is electrically connected to the controller, and the controller is electrically connected to the adjustment assembly 310. When the first detection mechanism 910 detects that the tab misalignment of the electrode piece 20 exceeds a preset range, the controller controls the adjustment assembly 310 to adjust the winding radius of the winding needle to correct the tab misalignment of the electrode piece 20.

[0222] It should be noted that when the first detection mechanism 910 detects that the tab misalignment of the pole piece 20 exceeds the threshold value, the first rewinding mechanism 100 and the second rewinding mechanism 200 rewind first, so that the winding needle releases the wound pole piece 20 and the isolation film 30 first, and then the adjustment component 310 adjusts the winding radius of the winding needle to correct the tab misalignment of the pole piece 20.

[0223] The adjustment assembly 310 can adjust the winding radius of the winding needle, thereby automatically correcting the amount of tab misalignment. When the first detection mechanism 910 detects that the amount of tab misalignment of the electrode sheet 20 exceeds a threshold, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 rewinds the separator 30, thereby unwinding the electrode assembly wound by the winding mechanism 300. The adjustment mechanism adjusts the winding radius of the winding needle based on the amount of tab misalignment detected by the first detection mechanism 910 to automatically correct the amount of tab misalignment. Afterwards, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 unwinds the separator 30, and the winding mechanism 300 rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs.

[0224] In addition, when correcting the tab misalignment, the pole piece 20 and the separator 30 wound on the winding mechanism 300 may be completely unwound, or the pole piece 20 and the separator 30 wound on the winding mechanism 300 may be partially unwound.

[0225] Please refer to Figure 12, which is a schematic block diagram of the connection between the second detection mechanism 920 and the first reeling and unreeling mechanism 100 provided in some embodiments of the present application. In some embodiments, the winding device 10 includes two first reeling and unreeling mechanisms 100, one first reeling and unreeling mechanism 100 is used to reel in or unreel the negative electrode sheet, and the other first reeling and unreeling mechanism 100 is used to reel in or unreel the positive electrode sheet. The winding device 10 also includes a second detection mechanism 920, which is used to detect the amount by which the negative electrode sheet wound on the winding mechanism 300 exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300. The first reeling and unreeling mechanism 100 responds to the second detection mechanism 920.

[0226] The winding device 10 includes two first rewinding and unwinding mechanisms 100, one of which is used to rewind or unwind the negative electrode sheet, and the other is used to rewind or unwind the positive electrode sheet. Optionally, the first rewinding and unwinding mechanism 100 includes a first rewinding and unwinding roller 110 and a first driving member. The first rewinding and unwinding roller 110 is used to set the electrode sheet roll. The first driving member is connected to the first rewinding and unwinding roller 110, and the first driving member is used to drive the first rewinding and unwinding roller 110 to rotate forward or reverse. When the first driving member drives the first rewinding and unwinding roller 110 to rotate forward, the first rewinding and unwinding roller 110 unwinds the electrode sheet 20. When the first driving member drives the first rewinding and unwinding roller 110 to rotate reversely, the first rewinding and unwinding roller 110 rewinds the electrode sheet 20.

[0227] The second detection mechanism 920 is used to detect the amount by which the negative electrode sheet wound on the winding mechanism 300 extends beyond the positive electrode sheet along the direction of the winding axis of the winding mechanism 300, commonly known as overhang detection. Optionally, the second detection mechanism 920 includes an industrial camera. The second detection mechanism 920 obtains image information of the electrode assembly wound by the winding mechanism 300 by photographing it, and analyzes the image information to determine the amount by which the negative electrode sheet extends beyond the positive electrode sheet along the direction of the winding axis of the winding mechanism 300.

[0228] The second detection mechanism 920 can be directly electrically connected to the first rewinding and unwinding mechanism 100, or it can be indirectly electrically connected to the first rewinding and unwinding mechanism 100 through an intermediate component. For example, the winding device 10 includes a controller, the second detection mechanism 920 is electrically connected to the controller, and the controller is electrically connected to the first rewinding and unwinding mechanism 100. When the second detection mechanism 920 detects that the amount by which the negative electrode sheet exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300 is within a preset range, the controller controls the first rewinding and unwinding mechanism 100 to continue unwinding. When the second detection mechanism 920 detects that the amount by which the negative electrode sheet exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300 exceeds the preset range, the controller controls the first rewinding and unwinding mechanism 100 to start rewinding.

[0229] The second detection mechanism 920 can be directly electrically connected to the second rewinding and unwinding mechanism 200, or it can be indirectly electrically connected to the second rewinding and unwinding mechanism 200 through an intermediate component. For example, the winding device 10 includes a controller, the second detection mechanism 920 is electrically connected to the controller, and the controller is electrically connected to the second rewinding and unwinding mechanism 200. When the second detection mechanism 920 detects that the amount by which the negative electrode sheet exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300 is within a preset range, the controller controls the second rewinding and unwinding mechanism 200 to continue unwinding. When the second detection mechanism 920 detects that the amount by which the negative electrode sheet exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300 exceeds the preset range, the controller controls the second rewinding and unwinding mechanism 200 to start rewinding.

[0230] The second detection mechanism 920 is provided to facilitate detection of the amount by which the negative electrode sheet wound on the winding mechanism 300 exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300. When the second detection mechanism 920 detects that the excess is below a threshold, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 rewinds the separator 30, thereby unwinding the electrode assembly wound by the winding mechanism 300. After manually or automatically correcting the excess, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 unwinds the separator 30, and the winding mechanism 300 rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, avoids wasting the entire electrode assembly, and thus reduces production costs.

[0231] 12 , in some embodiments, the winding device 10 further includes a deflection correction mechanism 930. Each first rewinding and unwinding mechanism 100 is provided with at least one deflection correction mechanism 930. The deflection correction mechanism 930 responds to the second detection mechanism 920. The deflection correction mechanism 930 is used to correct the deflection of the negative electrode sheet or the positive electrode sheet.

[0232] The first rewinding and unwinding mechanism 100 for rewinding or unwinding the negative electrode sheet is correspondingly provided with at least one correcting mechanism 930 , and the first rewinding and unwinding mechanism 100 for rewinding or unwinding the positive electrode sheet is correspondingly provided with at least one correcting mechanism 930 .

[0233] The correction mechanism 930 is used to correct the negative electrode sheet or the positive electrode sheet, and adjusts the amount by which the negative electrode sheet exceeds the positive electrode sheet in the extension direction of the winding axis of the winding mechanism 300 by correcting the negative electrode sheet or the positive electrode sheet.

[0234] The deflection correction mechanism 930 can correct the deflection of the positive or negative electrode sheet to automatically correct the excess of the negative electrode sheet beyond the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300. When the second detection mechanism 920 detects that the excess is below a threshold, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 rewinds the separator 30, thereby unwinding the electrode assembly wound by the winding mechanism 300. After the deflection correction mechanism 930 corrects the deflection of the positive or negative electrode sheet, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 unwinds the separator 30, and the winding mechanism 300 rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs.

[0235] According to some embodiments of the present application, please refer to Figures 1 to 12.

[0236] An embodiment of the present application provides a winding device 10, which includes a first rewinding and unwinding mechanism 100, a second rewinding and unwinding mechanism 200, and a winding mechanism 300. The first rewinding and unwinding mechanism 100 is used to rewind or unwind the electrode sheet 20, and the second rewinding and unwinding mechanism 200 is used to rewind or unwind the separator 30. The winding mechanism 300 is configured to be able to wind the electrode sheet 20 and the separator 30 when the first rewinding and unwinding mechanism 100 and the second rewinding and unwinding mechanism 200 are unwinding, and to unwind the electrode sheet 20 and the separator 30 when the first rewinding and unwinding mechanism 100 and the second rewinding and unwinding mechanism 200 are rewinding. During normal winding, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, and the second rewinding and unwinding mechanism 200 unwinds the separator 30. The electrode sheet 20 unwound by the first rewinding and unwinding mechanism 100 and the separator 30 unwound by the second rewinding and unwinding mechanism 200 are wound together by the winding mechanism 300 to form an electrode assembly. When it is found that the wound electrode assembly does not meet the design requirements, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 rewinds the isolation film 30, so that the electrode assembly wound by the winding mechanism 300 is unwound. After manual or automatic correction, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 unwinds the isolation film 30, and the winding mechanism 300 rewinds it, so that the rewound electrode assembly meets the design requirements, and there is no need to waste the entire electrode assembly, thereby reducing production costs.

[0237] The winding device 10 also includes a first bidirectional smoothing mechanism 400, which is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. The first bidirectional smoothing mechanism 400 is configured to smooth the electrode sheet 20 when the first reeling and unreeling mechanism 100 is reeling or unreeling. When the first reeling and unreeling mechanism 100 is unreeling the electrode sheet 20, the first bidirectional smoothing mechanism 400 can smooth the electrode sheet 20 unreeled by the first reeling and unreeling mechanism 100, reducing the risk of wrinkling the electrode sheet 20, which helps ensure that the electrode assembly wound by the winding mechanism 300 meets design requirements. When the first reeling and unreeling mechanism 100 is reeling the electrode sheet 20, the first bidirectional smoothing mechanism 400 can smooth the electrode sheet 20 unreeled by the winding mechanism 300, reducing the risk of wrinkling the electrode sheet 20, allowing the electrode sheet 20 to be smoothly reeled into the first reeling and unreeling mechanism 100, thereby facilitating rewinding.

[0238] The first bidirectional smoothing mechanism 400 includes a roller 410 and a first smoothing member 420. A first gap 430 is defined between the first smoothing member 420 and the roller 410. The first gap 430 is used for the electrode 20 to pass through. The first smoothing member 420 and the roller 410 cooperate to smooth the electrode 20. The first smoothing member 420 includes a first smoothing portion 421, a first guide portion 422, and a second guide portion 423. A first gap 430 is formed between the first smoothing portion 421 and the outer circumference of the roller 410. Along the conveying direction of the electrode 20, the first guide portion 422 and the second guide portion 423 are respectively connected to both sides of the first smoothing portion 421. The first guide portion 422 is configured to guide the electrode 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is unwinding. The second guide portion 423 is configured to guide the electrode 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is rewinding. When the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20, the electrode sheet 20 can pass through the first gap 430 formed between the first smoothing member 420 and the roller 410 in the forward direction and be smoothed by the first smoothing member 420 and the roller 410, thereby reducing the risk of wrinkling the electrode sheet 20. When the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20, the electrode assembly wound by the winding mechanism 300 is unwound, and the electrode sheet 20 can pass through the first gap 430 formed between the first smoothing member 420 and the roller 410 in the reverse direction and be smoothed by the first smoothing member 420 and the roller 410, thereby reducing the risk of wrinkling the electrode sheet 20. The first guide portion 422 is configured to guide the electrode sheet 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 unwinds, thereby achieving forward smoothing of the electrode sheet 20. The second guide portion 423 is configured to guide the pole piece 20 to the first gap 430 when the first rewinding and unwinding mechanism 100 is rewinding, thereby achieving reverse smoothing of the pole piece 20. In this way, no matter whether the first rewinding and unwinding mechanism 100 is rewinding or unwinding, the pole piece 20 can be smoothed, reducing the risk of wrinkling of the pole piece 20 and facilitating rewinding of the winding mechanism 300.

[0239] The winding device 10 includes a first conveying mechanism 500, which is located downstream of the first reeling and unreeling mechanism 100 and upstream of the winding mechanism 300. The first conveying mechanism 500 is used to convey the electrode 20 in the forward or reverse direction. By providing the first conveying mechanism 500, sufficient power is provided for the forward or reverse conveyance of the electrode 20, thereby accelerating the conveying speed of the electrode 20, especially when the conveying path of the electrode 20 is long. In addition, the first conveying mechanism 500 can form a tension barrier, so that the tension of the electrode 20 is balanced during the conveyance process, reducing the risk of the electrode 20 breaking due to excessive tension.

[0240] The first conveying mechanism 500 includes a first driven roller 520 and a first active roller 510. There is a second gap 511 between the first active roller 510 and the first driven roller 520. The second gap 511 is used for the electrode 20 to pass through. The first active roller 510 is configured to be able to rotate forward or reverse to cooperate with the first driven roller 520 to convey the electrode 20 in a forward or reverse direction. The first conveying mechanism 500 also includes a second bidirectional smoothing mechanism. The second bidirectional smoothing mechanism is provided upstream and / or downstream of the first active roller 510. The second bidirectional smoothing mechanism is configured to smooth the electrode 20 when the first active roller 510 and the first driven roller 520 cooperate to convey the electrode 20 in a forward or reverse direction. There is a second gap 511 between the first active roller 510 and the first driven roller 520. The electrode 20 can pass through the second gap 511. When the first active roller 510 rotates forward, the first active roller 510 and the first driven roller 520 cooperate to convey the electrode 20 in a forward direction. When the first active roller 510 rotates in the reverse direction, the first active roller 510 and the first driven roller 520 cooperate to transport the electrode sheet 20 in the reverse direction. By arranging a second bidirectional smoothing mechanism upstream and / or downstream of the first active roller 510, the electrode sheet 20 is smoothed before passing through the second gap 511, reducing the risk of wrinkled electrode tabs entering the second gap 511. In this way, the electrode sheet 20 is not easily damaged by the cooperation of the first active roller 510 and the first driven roller 520.

[0241] The winding device 10 includes a first buffer mechanism 700, located downstream of the first reel-and-unwind mechanism 100 and upstream of the winding mechanism 300. The first buffer mechanism 700 is used to buffer the electrode sheets 20. During the initial startup of the winding device 10, the first reel-and-unwind mechanism 100 must not unwind too quickly, as this could easily cause the electrode sheets 20 to break. By providing the first buffer mechanism 700, during the initial startup of the winding device 10, the electrode sheets 20 buffered by the first buffer mechanism 700 can be quickly released and supplied to the winding mechanism 300, while the first reel-and-unwind mechanism 100 is slowly accelerated. This speeds up production and reduces production costs. Furthermore, if the wound electrode assembly is found to not meet design requirements, the electrode assembly wound by the winding mechanism 300 can be unwound and the electrode sheets 20 buffered in the first buffer mechanism 700, rather than being fully rewound into the first reel-and-unwind mechanism 100. During rewinding, the electrode sheets 20 buffered in the first buffer mechanism 700 can be released. In this way, the forward and reverse transport paths of the electrode 20 are shortened, which is beneficial to reducing the rewinding time, increasing the rewinding efficiency, and thus reducing the production cost.

[0242] The winding device 10 includes a second buffer mechanism 800, located downstream of the second reel-and-unreel mechanism 200 and upstream of the winding mechanism 300. The second buffer mechanism 800 is used to buffer the separator 30. By providing the second buffer mechanism 800, during the initial startup of the winding device 10, the separator 30 buffered in the second buffer mechanism 800 can be quickly released and supplied to the winding mechanism 300, while the second reel-and-unreel mechanism 200 slowly accelerates. This speeds up production and reduces costs. Furthermore, if the wound electrode assembly is found to not meet design requirements, the electrode assembly wound by the winding mechanism 300 can be unwound and the separator 30 buffered in the second buffer mechanism 800, rather than being rewound into the second reel-and-unreel mechanism 200. During rewinding, the separator 30 buffered in the second buffer mechanism 800 can be released. This shortens the forward and reverse transport paths of the separator 30, reducing rewinding time, increasing rewinding efficiency, and ultimately reducing production costs.

[0243] The winding device 10 includes a first detection mechanism 910, which is used to detect the misalignment of the tabs of the pole piece 20 wound on the winding mechanism 300. The first and second winding and unwinding mechanisms 100 and 200 are responsive to the first detection mechanism 910. The winding mechanism 300 includes a winding needle and an adjustment assembly 310. The winding needle is used to wind the pole piece 20 and the separator 30. The adjustment assembly 310 is used to adjust the winding radius of the winding needle. The adjustment assembly 310 is responsive to the first detection mechanism 910. The adjustment assembly 310 can adjust the winding radius of the winding needle, thereby automatically correcting the misalignment of the tabs. When the first detection mechanism 910 detects that the tab misalignment of the electrode piece 20 exceeds the threshold value, the first rewinding and unwinding mechanism 100 rewinds the electrode piece 20, and the second rewinding and unwinding mechanism 200 rewinds the isolation film 30, so that the electrode assembly wound by the winding mechanism 300 is unwound, and the adjustment mechanism adjusts the winding radius of the winding needle according to the tab misalignment detected by the first detection mechanism 910 to automatically correct the tab misalignment. Afterwards, the first rewinding and unwinding mechanism 100 unwinds the electrode piece 20, and the second rewinding and unwinding mechanism 200 unwinds the isolation film 30, and the electrode assembly is rewound through the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and there is no need to waste the entire electrode assembly, thereby reducing production costs.

[0244] The winding device 10 includes two first winding and unwinding mechanisms 100, one first winding and unwinding mechanism 100 is used to wind or unwind the negative electrode sheet, and the other first winding and unwinding mechanism 100 is used to wind or unwind the positive electrode sheet; the winding device 10 also includes a second detection mechanism 920, the second detection mechanism 920 is used to detect the amount by which the negative electrode sheet wound on the winding mechanism 300 exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300, and the first winding and unwinding mechanism 100 responds to the second detection mechanism 920. The winding device 10 also includes a correction mechanism 930, and each first winding and unwinding mechanism 100 is correspondingly provided with at least one correction mechanism 930, the correction mechanism 930 responds to the second detection mechanism 920, and the correction mechanism 930 is used to correct the deviation of the negative electrode sheet or the positive electrode sheet. The deflection correction mechanism 930 can correct the deflection of the positive or negative electrode sheet to automatically correct the excess of the negative electrode sheet beyond the positive electrode sheet along the extension direction of the winding axis of the winding mechanism 300. When the second detection mechanism 920 detects that the excess is below a threshold, the first rewinding and unwinding mechanism 100 rewinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 rewinds the separator 30, thereby unwinding the electrode assembly wound by the winding mechanism 300. After the deflection correction mechanism 930 corrects the deflection of the positive or negative electrode sheet, the first rewinding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second rewinding and unwinding mechanism 200 unwinds the separator 30, and the winding mechanism 300 rewinds the electrode assembly. This ensures that the rewound electrode assembly meets design requirements, eliminating the need to waste the entire electrode assembly, thereby reducing production costs.

[0245] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A winding device, wherein: include: A first rewinding and unwinding mechanism, used for rewinding or unwinding the pole piece; The second rewinding and unwinding mechanism is used for rewinding or unwinding the isolation film; The winding mechanism is configured to be able to wind the pole piece and the isolation film when the first and second winding mechanisms are unwinding, and to be able to unwind the pole piece and the isolation film when the first and second winding mechanisms are winding.

2. The winding device according to claim 1, wherein: The winding device also includes: The first bidirectional smoothing mechanism is located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism. The first bidirectional smoothing mechanism is configured to smooth the pole piece when the first reeling and unreeling mechanism is reeling or unreeling.

3. The winding device according to claim 2, wherein: The first bidirectional smoothing mechanism includes: Roller; A first smoothing member has a first gap with the roller, and the first gap is used for the pole piece to pass through. The first smoothing member and the roller are used to cooperate to smooth the pole piece.

4. The winding device according to claim 3, wherein: The first smoothing member comprises: a first smoothing portion, forming the first gap with the outer circumferential surface of the passing roller; A first guide portion and a second guide portion are respectively connected to both sides of the first smoothing portion along the conveying direction of the pole piece. The first guide portion is configured to guide the pole piece to the first gap when the first rewinding mechanism is unwinding, and the second guide portion is configured to guide the pole piece to the first gap when the first rewinding mechanism is rewinding.

5. The winding device according to claim 4, wherein: The first guide portion and the second guide portion are both bent in a direction away from the roller compared to the first smoothing portion.

6. The winding device according to claim 5, wherein: The first guide portion and the second guide portion extend along arc tracks.

7. The winding device according to any one of claims 4 to 6, wherein: The first smoothing portion extends along a straight line; or The first smoothing portion extends along an arc trajectory, and the center of the arc trajectory is located on the axis of the roller.

8. The winding device according to any one of claims 2 to 7, wherein: The winding device includes a plurality of the first bidirectional smoothing mechanisms, and the plurality of the first bidirectional smoothing mechanisms are arranged along the conveying direction of the pole piece.

9. The winding device according to any one of claims 1 to 8, wherein: The winding device includes a first conveying mechanism, which is located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism. The first conveying mechanism is used to convey the pole piece in a forward or reverse direction.

10. The winding device according to claim 9, wherein: The first conveying mechanism includes: a first driven roller; A first active roller has a second gap with the first driven roller, and the second gap is used for the pole piece to pass through. The first active roller is configured to be able to rotate forward or reverse to cooperate with the first driven roller to transport the pole piece in a forward or reverse direction.

11. The winding device according to claim 10, wherein: The first conveying mechanism also includes a second bidirectional smoothing mechanism, which is arranged upstream and / or downstream of the first active roller. The second bidirectional smoothing mechanism is configured to smooth the electrode sheet when the first active roller and the first driven roller cooperate to convey the electrode sheet in a forward or reverse direction.

12. The winding device according to claim 11, wherein: The second bidirectional smoothing mechanism includes two second smoothing members. A third gap is defined between the two second smoothing members. The third gap is used for the pole piece to pass through. The two second smoothing members are used to cooperate in smoothing the pole piece.

13. The winding device according to claim 12, wherein: The second smoothing member comprises: a second smoothing portion, wherein the third gap is formed between the second smoothing portions of the two second smoothing members; The third guide portion and the fourth guide portion are respectively connected to both sides of the second smoothing portion along the conveying direction of the electrode piece. The third guide portion is configured to guide the electrode piece to the third gap when the first active roller and the first driven roller cooperate to convey the electrode piece in the forward direction. The fourth guide portion is configured to guide the electrode piece to the third gap when the first active roller and the first driven roller cooperate to convey the electrode piece in the reverse direction.

14. The winding device according to claim 13, wherein: The third guiding portion and the fourth guiding portion of each second smoothing member are bent in a direction away from the other second smoothing member compared to the second smoothing portion.

15. The winding device according to any one of claims 9 to 14, wherein: The winding device includes a plurality of the first conveying mechanisms, which are arranged along the conveying direction of the electrode sheet. Along the conveying direction of the electrode sheet, the first conveying mechanism closest to the winding mechanism is used to guide the electrode sheet into the winding mechanism.

16. The winding device according to any one of claims 1 to 15, wherein: The winding device further includes a second conveying mechanism, which is located downstream of the second reeling and unreeling mechanism and upstream of the winding mechanism, and is used to convey the isolation film in a forward or reverse direction.

17. The winding device according to claim 16, wherein: The second conveying mechanism includes: a second driven roller; The second active roller has a fourth gap with the second driven roller, and the fourth gap is used for the isolation film to pass through. The second active roller is configured to be able to rotate forward or reverse to cooperate with the second driven roller to transport the isolation film in a forward or reverse direction.

18. The winding device according to any one of claims 1 to 17, wherein: The winding device includes a first cache mechanism, which is located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism, and is used to cache the pole piece.

19. The winding device according to claim 18, wherein: The first cache mechanism includes: A first fixed roller group, comprising at least one first fixed roller; a first movable roller group, comprising at least one first movable roller, wherein the first movable roller group and the first fixed roller group are arranged along a first direction, and the pole pieces are alternately wound around the first fixed roller and the first movable roller; The first driving mechanism is connected to the first movable roller, and the first driving mechanism is used to drive the first movable roller to move along the first direction.

20. The winding device according to claim 19, wherein: The first fixed roller group includes a plurality of first fixed rollers, and the plurality of first fixed rollers are spaced apart along the second direction; and / or The first movable roller group includes a plurality of first movable rollers, and the plurality of first movable rollers are spaced apart along the second direction; The second direction intersects the first direction.

21. The winding device according to any one of claims 1 to 20, wherein: The winding device comprises: a first conveying mechanism, the first conveying mechanism being used to convey the electrode piece in a forward or reverse direction; a first buffer mechanism, located downstream of the first reeling and unreeling mechanism and upstream of the winding mechanism, the first buffer mechanism being used to buffer the pole piece; The first conveying mechanism is provided upstream and downstream of the first buffer mechanism.

22. The winding device according to any one of claims 1 to 21, wherein: The winding device includes a second buffer mechanism, which is located downstream of the second reeling and unreeling mechanism and upstream of the winding mechanism, and is used to buffer the isolation film.

23. The winding device according to claim 22, wherein: The second cache mechanism includes: A second fixed roller group, comprising at least one second fixed roller; a second movable roller group, comprising at least one second movable roller, wherein the second movable roller group and the second fixed roller group are arranged along a third direction, and the isolation film is alternately wound around the second fixed roller and the second movable roller; The second driving mechanism is connected to the second movable roller, and the second driving mechanism is used to drive the second movable roller to move along the third direction.

24. The winding device according to claim 23, wherein: The second fixed roller group includes a plurality of second fixed rollers, and the plurality of second fixed rollers are spaced apart along the fourth direction; and / or The second movable roller group includes a plurality of second movable rollers, and the plurality of second movable rollers are arranged at intervals along the fourth direction; The fourth direction intersects the third direction.

25. The winding device according to any one of claims 1 to 24, wherein: The winding device includes a first detection mechanism, which is used to detect the misalignment of the pole tab of the pole piece wound on the winding mechanism, and the first rewinding and unwinding mechanism and the second rewinding and unwinding mechanism respond to the first detection mechanism.

26. The winding device according to claim 25, wherein: The winding mechanism includes a winding needle and an adjustment component. The winding needle is used to wind the pole piece and the isolation membrane. The adjustment component is used to adjust the winding radius of the winding needle. The adjustment component responds to the first detection mechanism.

27. The winding device according to any one of claims 1 to 26, wherein: The winding device includes two first winding and unwinding mechanisms, one first winding and unwinding mechanism is used to wind or unwind the negative electrode sheet, and the other first winding and unwinding mechanism is used to wind or unwind the positive electrode sheet; The winding device also includes: The second detection mechanism is used to detect the amount by which the negative electrode sheet wound on the winding mechanism exceeds the positive electrode sheet along the extension direction of the winding axis of the winding mechanism, and the first rewinding and unwinding mechanism responds to the second detection mechanism.

28. The winding device according to claim 27, wherein: The winding device also includes a correction mechanism. Each first rewinding and unwinding mechanism is correspondingly provided with at least one correction mechanism. The correction mechanism responds to the second detection mechanism and is used to correct the negative electrode sheet or the positive electrode sheet.

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