Winding device

Abstract

The invention provides a winding device, and relates to the field of batteries. The winding device comprises a first winding and unwinding mechanism, a second winding and unwinding mechanism and a winding mechanism, the first winding and unwinding mechanism is used for winding or unwinding the pole piece, and the second winding and unwinding mechanism is used for winding or unwinding the isolating membrane. And the winding mechanism is configured to be capable of winding the pole piece and the isolating membrane when the first winding and unwinding mechanism and the second winding and unwinding mechanism are used for unwinding, and capable of unwinding the pole piece and the isolating membrane when the first winding and unwinding mechanism and the second winding and unwinding mechanism are used for winding. When the wound electrode assembly is found not to meet the design requirement, the first winding and unwinding mechanism winds the pole piece, the second winding and unwinding mechanism winds the isolating membrane, after the electrode assembly wound by the winding mechanism is unwound and manually or automatically corrected, the first winding and unwinding mechanism unwinds the pole piece, the second winding and unwinding mechanism unwinds the isolating membrane, rewinding is conducted through the winding mechanism, and the winding mechanism is used for winding the electrode assembly. And the rewound electrode assembly meets the design requirement, the whole electrode assembly does not need to be wasted, and therefore the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a winding device. BACKGROUND

[0002] Batteries are widely used in the field of new energy, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. Batteries include electrode assemblies, which are components that undergo electrochemical reactions in batteries. Electrode assemblies include wound electrode assemblies and stacked electrode assemblies. Currently, the production cost of wound electrode assemblies is high. SUMMARY

[0003] 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.

[0004] The embodiments of the present application provide a winding device, which includes a first winding and unwinding mechanism, a second winding and unwinding mechanism, and a winding mechanism. The first winding and unwinding mechanism is used to wind or unwind electrode sheets. The second winding and unwinding mechanism is used to wind or unwind separator films. The winding mechanism is configured to wind the electrode sheets and the separator films when the first winding and unwinding mechanism and the second winding and unwinding mechanism are unwinding, and to unwind the electrode sheets and the separator films when the first winding and unwinding mechanism and the second winding and unwinding mechanism are winding.

[0005] In the above technical solution, during normal winding, the first winding and unwinding mechanism unwinds the electrode sheets, and the second winding and unwinding mechanism unwinds the separator films. The electrode sheets unwound by the first winding and unwinding mechanism and the separator films unwound by the second winding and unwinding mechanism are wound by the winding mechanism to form an electrode assembly. When it is found that the wound electrode assembly does not meet the design requirements, the first winding and unwinding mechanism winds the electrode sheets, and the second winding and unwinding mechanism winds the separator films, so that the electrode assembly wound by the winding mechanism is unwound. After manual or automatic correction, the first winding and unwinding mechanism unwinds the electrode sheets, and the second winding and unwinding mechanism unwinds the separator films. The rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0006] As an optional technical solution of the embodiments of the present application, the winding device further includes a first bidirectional flattening mechanism, which is located downstream of the first winding and unwinding mechanism and upstream of the winding mechanism. The first bidirectional flattening mechanism is configured to flatten the electrode sheets when the first winding and unwinding mechanism is winding or unwinding.

[0007] In the technical solution, when the first winding and unwinding mechanism unwinds the pole piece, the first bidirectional flattening mechanism can flatten the pole piece unwound by the first winding and unwinding mechanism, reducing the risk of creases on the pole piece and facilitating the electrode assembly wound by the winding mechanism to meet the design requirements. When the first winding and unwinding mechanism winds the pole piece, the electrode assembly wound by the winding mechanism is unwound, and the first bidirectional flattening mechanism can flatten the pole piece unwound by the winding mechanism, reducing the risk of creases on the pole piece and facilitating the pole piece to be smoothly wound to the first winding and unwinding mechanism, thereby facilitating rewinding.

[0008] As an optional technical solution of the embodiment, the first bidirectional flattening mechanism comprises a first flattening piece and a passing roller, and a first gap is formed between the first flattening piece and the passing roller, the first gap being used for the pole piece to pass through, and the first flattening piece and the passing roller being used for cooperating to flatten the pole piece.

[0009] In the technical solution, when the first winding and unwinding mechanism unwinds the pole piece, the pole piece can pass through the first gap formed between the first flattening piece and the passing roller in a forward direction and be flattened by the first flattening piece and the passing roller, reducing the risk of creases on the pole piece. When the first winding and unwinding mechanism winds the pole piece, the electrode assembly wound by the winding mechanism is unwound, and the pole piece can pass through the first gap formed between the first flattening piece and the passing roller in a reverse direction and be flattened by the first flattening piece and the passing roller, reducing the risk of creases on the pole piece.

[0010] As an optional technical solution of the embodiment, the first flattening piece comprises a first flattening portion, a first guide portion and a second guide portion, the first gap being formed between the first flattening portion and the outer circumferential surface of the passing 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 flattening portion, the first guide portion being configured to guide the pole piece to the first gap when the first winding and unwinding mechanism unwinds, and the second guide portion being configured to guide the pole piece to the first gap when the first winding and unwinding mechanism winds.

[0011] In the technical solution, the first guide portion is configured to guide the pole piece to the first gap when the first winding and unwinding mechanism unwinds, thereby realizing forward flattening of the pole piece. The second guide portion is configured to guide the pole piece to the first gap when the first winding and unwinding mechanism winds, thereby realizing reverse flattening of the pole piece. In this way, no matter whether the first winding and unwinding mechanism winds or unwinds, the pole piece can be flattened, reducing the risk of creases on the pole piece and facilitating rewinding of the winding mechanism.

[0012] As an optional technical solution of the embodiment, the first guide portion and the second guide portion are both bent away from the passing roller compared with the first flattening portion.

[0013] In the technical scheme, the first guide part is bent in a direction away from the passing roller compared with the first flattening part, so that the pole piece can be guided into the first gap when the first winding and unwinding mechanism unwinds, thereby realizing forward flattening of the pole piece. The second guide part is bent in a direction away from the passing roller compared with the first flattening part, so that the pole piece can be guided into the first gap when the first winding and unwinding mechanism winds, thereby realizing reverse flattening of the pole piece.

[0014] As an optional technical scheme of the embodiment, the first guide part and the second guide part extend along a circular arc track.

[0015] In the technical scheme, the first guide part and the second guide part extend along a circular arc track, so that the first guide part and the second guide part are relatively smooth, the transition is smooth, the stress on the pole piece can be reduced, and the risk of damage to the pole piece can be reduced.

[0016] As an optional technical scheme of the embodiment, the first flattening part extends along a straight line track, or the first flattening part extends along a circular arc track, and the center of the circular arc track is located on the axis of the passing roller.

[0017] In the technical scheme, when the first flattening part extends along a straight line track, the length of the first gap is relatively short, the pole piece can quickly pass through the first gap, the external force on the pole piece is relatively small, and the risk of damage to the pole piece is relatively small. When the first flattening part extends along a circular arc track and the center of the circular arc track is located on the axis of the passing roller, the length of the first gap is relatively long, the flattening effect on the pole piece is relatively good, and the pole piece can be bent, thereby changing the running direction.

[0018] As an optional technical scheme of the embodiment, the winding device comprises a plurality of the first bidirectional flattening mechanisms, and the plurality of first bidirectional flattening mechanisms are arranged along the conveying direction of the pole piece.

[0019] In the technical scheme, a plurality of first bidirectional flattening mechanisms are arranged along the conveying direction of the pole piece, so that the flattening effect on the pole piece is enhanced, the risk of wrinkling of the pole piece is reduced, and the quality of the wound pole piece is improved.

[0020] As an optional technical scheme of the embodiment, the winding device comprises a first conveying mechanism, the first conveying mechanism is located downstream of the first winding and unwinding mechanism and upstream of the winding mechanism, and the first conveying mechanism is used for conveying the pole piece in a forward direction or a reverse direction.

[0021] In the technical solution, the first conveying mechanism is arranged to provide sufficient power for the forward or reverse conveying of the pole piece, thereby accelerating the conveying speed of the pole piece, especially when the pole piece conveying path is long. In addition, the first conveying mechanism can form a tension break, so that the tension is balanced during the conveying of the pole piece, thereby reducing the risk of breakage of the pole piece due to excessive tension.

[0022] As an optional technical solution of the embodiment, the first conveying mechanism comprises a first driven roller and a first driving roller, the first driving roller and the first driven roller have a second gap therebetween for the pole piece to pass through, and the first driving roller is configured to be able to rotate forward or reverse to cooperate with the first driven roller to forward or reverse convey the pole piece.

[0023] In the technical solution, the first driving roller and the first driven roller have a second gap therebetween, and the pole piece can pass through the second gap. When the first driving roller rotates forward, the first driving roller and the first driven roller cooperate to forward convey the pole piece. When the first driving roller rotates reverse, the first driving roller and the first driven roller cooperate to reverse convey the pole piece.

[0024] As an optional technical solution of the embodiment, the first conveying mechanism further comprises a second bidirectional flattening mechanism, the upstream and / or downstream of the first driving roller is provided with the second bidirectional flattening mechanism, and the second bidirectional flattening mechanism is configured to be able to flatten the pole piece when the first driving roller and the first driven roller cooperate to forward or reverse convey the pole piece.

[0025] In the technical solution, the second bidirectional flattening mechanism is arranged upstream and / or downstream of the first driving roller, so that the pole piece is flattened before passing through the second gap, thereby reducing the risk of the wrinkled tab entering the second gap. In this way, the pole piece is less likely to damage the pole piece under the cooperation of the first driving roller and the first driven roller.

[0026] As an optional technical solution of the embodiment, the second bidirectional flattening mechanism comprises two second flattening pieces, the two second flattening pieces have a third gap therebetween for the pole piece to pass through, and the two second flattening pieces are used to cooperate to flatten the pole piece.

[0027] In the technical solution, when the first driving roller rotates forward, the pole piece can pass through the third gap formed between the two second flattening pieces in a forward direction and be flattened by the two second flattening pieces, thereby reducing the risk of wrinkling of the pole piece. When the first driving roller rotates reverse, the electrode assembly wound by the winding mechanism is unwound, the pole piece can pass through the third gap formed between the two second flattening pieces in a reverse direction and be flattened by the two second flattening pieces, thereby reducing the risk of wrinkling of the pole piece.

[0028] As an optional technical solution of the embodiment of the present application, the second smoothing member comprises a second smoothing part, a third guiding part and a fourth guiding part, and the second smoothing parts of the two second smoothing members form the third gap therebetween; along the conveying direction of the pole piece, the third guiding part and the fourth guiding part are respectively connected to the two sides of the second smoothing part, the third guiding part is configured to guide the pole piece to the third gap when the first driving roller and the first driven roller cooperate to convey the pole piece in the positive direction, and the fourth guiding part is configured to guide the pole piece to the third gap when the first driving roller and the first driven roller cooperate to convey the pole piece in the reverse direction.

[0029] In the above technical solution, the third guiding part is configured to guide the pole piece to the third gap when the first driving roller and the first driven roller cooperate to convey the pole piece in the positive direction, thereby realizing the positive smoothing of the pole piece. The fourth guiding part is configured to guide the pole piece to the third gap when the first driving roller and the first driven roller cooperate to convey the pole piece in the reverse direction, thereby realizing the reverse smoothing of the pole piece. In this way, no matter whether the first driving roller is rotating in the positive direction or the reverse direction, the pole piece can be smoothed, thereby reducing the risk of wrinkling of the pole piece and facilitating rewinding of the winding mechanism.

[0030] As an optional technical solution of the embodiment of the present application, the third guiding part and the fourth guiding part of each second smoothing member are bent away from the other second smoothing member compared with the second smoothing part.

[0031] In the above technical solution, by bending the third guiding part away from the other second smoothing member compared with the second smoothing part, the pole piece can be guided into the third gap when the first driving roller rotates in the positive direction, thereby realizing the positive smoothing of the pole piece. By bending the fourth guiding part away from the other second smoothing member compared with the second smoothing part, the pole piece can be guided into the third gap when the first driving roller rotates in the reverse direction, thereby realizing the reverse smoothing of the pole piece.

[0032] As an optional technical solution of the embodiment of the present application, the winding device comprises a plurality of first conveying mechanisms, and the plurality of first conveying mechanisms are arranged along the conveying direction of the pole piece. The first conveying mechanism closest to the winding mechanism is used to guide the pole piece into the winding mechanism along the conveying direction of the pole piece.

[0033] In the above technical solution, the first conveying mechanism closest to the winding mechanism can guide the pole piece into the winding mechanism, thereby further reducing the risk of wrinkling of the pole piece wound by the winding mechanism, and facilitating the winding electrode assembly to meet the design requirements, thereby reducing the production cost.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] As an optional technical solution of the embodiment of the present application, the first buffering mechanism comprises a first fixed roller set, a first movable roller set and a first driving mechanism, the first fixed roller set comprises at least one first fixed roller, the first movable roller set comprises at least one first movable roller, the first movable roller set and the first fixed roller set are arranged along a first direction, the pole piece is alternately arranged around the first fixed roller and the first movable roller, and the first driving mechanism is connected to the first movable roller and is used to drive the first movable roller to move along the first direction.

[0041] In the above technical solution, the pole piece is alternately arranged around the first fixed roller and the first movable roller, when the pole piece needs to be buffered, the first driving mechanism can drive the first movable roller to move away from the first fixed roller along the first direction, so as to increase the distance between the first movable roller and the first fixed roller, thereby achieving the buffering of the pole piece. When the pole piece needs to be released, the first driving mechanism can drive the first movable roller to move close to the first fixed roller along the first direction, so as to reduce the distance between the first movable roller and the first fixed roller, thereby achieving the release of the pole piece.

[0042] As an optional technical solution of the embodiment of the present application, the first fixed roller set comprises a plurality of first fixed rollers, and the plurality of first fixed rollers are arranged at intervals along a second direction; and / or the first movable roller set comprises a plurality of first movable rollers, and the plurality of first movable rollers are arranged at intervals along the second direction; wherein the second direction intersects the first direction.

[0043] In the above technical solution, by arranging a plurality of first fixed rollers and a plurality of first movable rollers, the pole piece is alternately arranged around the first fixed roller and the first movable roller, so that the length of the buffered pole piece can be increased.

[0044] As an optional technical solution of the embodiment of the present application, the winding device comprises a first conveying mechanism and a first buffering mechanism, the first conveying mechanism is used to convey the pole piece in a forward direction or a reverse direction, the first buffering mechanism is located downstream of the first winding and unwinding mechanism and upstream of the winding mechanism, the first buffering mechanism is used to buffer the pole piece, and upstream and downstream of the first buffering mechanism are both provided with the first conveying mechanism.

[0045] In the above technical solution, by arranging the first conveying mechanism upstream and / or downstream of the first buffering mechanism, the first conveying mechanism can conveniently provide the pole piece to the first buffering mechanism for buffering, and the pole piece can be quickly output when the first buffering mechanism releases the pole piece.

[0046] As an optional technical solution of the embodiment of the present application, the winding device comprises a second buffering mechanism, the second buffering mechanism is located downstream of the second winding and unwinding mechanism and upstream of the winding mechanism, and the second buffering mechanism is used for buffering the isolation film.

[0047] In the above technical solution, at the initial stage of starting of the winding device, the second winding and unwinding mechanism cannot be unwound too fast, otherwise the isolation film is prone to be broken. By arranging the second buffering mechanism, at the initial stage of starting of the winding device, the isolation film buffered by the second buffering mechanism can be quickly released to supply the winding mechanism, and the second winding and unwinding mechanism can be slowly accelerated, so that 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 wound electrode assembly can be unwound and the isolation film can be buffered into the second buffering mechanism instead of being all wound into the second winding and unwinding mechanism, and the isolation film buffered by the second buffering mechanism can be released during rewinding. In this way, the path of forward conveying and reverse conveying of the isolation film is shortened, which is beneficial to reducing the rewinding time, accelerating the rewinding efficiency, and further reducing the production cost.

[0048] As an optional technical solution of the embodiment of the present application, the second buffering mechanism comprises a second fixed roller set, a second movable roller set and a second driving mechanism, the second fixed roller set comprises at least one second fixed roller, the second movable roller set comprises at least one second movable roller, the second movable roller set and the second fixed roller set are arranged along a third direction, and the isolation film is alternately arranged 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 for driving the second movable roller to move along the third direction.

[0049] In the above technical solution, the isolation film is alternately arranged 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 to move away from the second fixed roller along the third direction, so as to increase the distance between the second movable roller and the second fixed roller, so as to achieve the buffering of the isolation film. When the isolation film needs to be released, the second driving mechanism can drive the second movable roller to move close to the second fixed roller along the third direction, so as to reduce the distance between the second movable roller and the second fixed roller, so as to achieve the release of the isolation film.

[0050] As an optional technical solution of the embodiment of the present application, the second fixed roller set comprises a plurality of second fixed rollers, and the plurality of second fixed rollers are arranged at intervals along a fourth direction; and / or the second movable roller set comprises 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 the third direction.

[0051] In the technical scheme, the plurality of second fixed rollers and the plurality of second movable rollers are arranged, so that the isolation film alternately passes through the second fixed rollers and the second movable rollers, and the length of the cached isolation film is increased.

[0052] As an optional technical scheme of the embodiment, the winding device comprises a first detection mechanism, the first detection mechanism is configured to detect the misalignment amount of the tab of the pole piece wound on the winding mechanism, and the first winding and unwinding mechanism and the second winding and unwinding mechanism are configured to respond to the first detection mechanism.

[0053] In the technical scheme, the first detection mechanism is arranged, so that the misalignment amount of the tab of the pole piece is detected. When the first detection mechanism detects that the misalignment amount of the tab of the pole piece exceeds a threshold value, the first winding and unwinding mechanism winds the pole piece, and the second winding and unwinding mechanism winds the isolation film, so that the electrode assembly wound by the winding mechanism is unwound. After the misalignment amount of the tab is manually or automatically corrected, the first winding and unwinding mechanism unwinds the pole piece, the second winding and unwinding mechanism unwinds the isolation film, and the rewinding is performed by the winding mechanism, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0054] As an optional technical scheme of the embodiment, the winding mechanism comprises a winding needle and an adjusting assembly, the winding needle is configured to wind the pole piece and the isolation film, the adjusting assembly is configured to adjust the winding radius of the winding needle, and the adjusting assembly is configured to respond to the first detection mechanism.

[0055] In the technical scheme, the adjusting assembly can adjust the winding radius of the winding needle, so that the misalignment amount of the tab is automatically corrected. When the first detection mechanism detects that the misalignment amount of the tab of the pole piece exceeds a threshold value, the first winding and unwinding mechanism winds the pole piece, and the second winding and unwinding mechanism winds the isolation film, so that the electrode assembly wound by the winding mechanism is unwound. The adjusting mechanism adjusts the winding radius of the winding needle according to the misalignment amount of the tab detected by the first detection mechanism, so that the misalignment amount of the tab is automatically corrected. Then, the first winding and unwinding mechanism unwinds the pole piece, the second winding and unwinding mechanism unwinds the isolation film, and the rewinding is performed by the winding mechanism, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0056] As an optional technical scheme of the embodiment, the winding device comprises two first winding and unwinding mechanisms, one first winding and unwinding mechanism is configured to wind or unwind the negative pole piece, and the other first winding and unwinding mechanism is configured to wind or unwind the positive pole piece. The winding device further comprises a second detection mechanism, the second detection mechanism is configured to detect the overhanging amount of the negative pole piece wound on the winding mechanism beyond the positive pole piece in the extension direction of the winding axis of the winding mechanism, and the first winding and unwinding mechanism is configured to respond to the second detection mechanism.

[0057] In the technical scheme, the second detection mechanism is arranged to detect the overhanging amount of the negative electrode sheet along the extension direction of the winding shaft of the winding mechanism beyond the positive electrode sheet. When the second detection mechanism detects that the overhanging amount is lower than the threshold value, the first take-up and pay-off mechanism winds the electrode sheet, and the second take-up and pay-off mechanism winds the separator, so that the electrode assembly wound by the winding mechanism is unwound, and after the overhanging amount is manually or automatically corrected, the first take-up and pay-off mechanism pays off the electrode sheet, and the second take-up and pay-off mechanism pays off the separator, and the rewinding is performed by the winding mechanism, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0058] As an optional technical scheme of the embodiment, the winding device further comprises a deviation rectifying mechanism, at least one of the deviation rectifying mechanisms is arranged corresponding to each of the first take-up and pay-off mechanisms, and the deviation rectifying mechanism is used for rectifying the negative electrode sheet or the positive electrode sheet in response to the second detection mechanism.

[0059] In the technical scheme, the deviation rectifying mechanism can rectify the positive electrode sheet or the negative electrode sheet to automatically correct the overhanging amount of the negative electrode sheet along the extension direction of the winding shaft of the winding mechanism beyond the positive electrode sheet. When the second detection mechanism detects that the overhanging amount is lower than the threshold value, the first take-up and pay-off mechanism winds the electrode sheet, and the second take-up and pay-off mechanism winds the separator, so that the electrode assembly wound by the winding mechanism is unwound, and after the deviation rectifying mechanism rectifies the positive electrode sheet or the negative electrode sheet, the first take-up and pay-off mechanism pays off the electrode sheet, and the second take-up and pay-off mechanism pays off the separator, and the rewinding is performed by the winding mechanism, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical schemes of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0061] Figure 1 The structural schematic diagram of the winding device provided by some embodiments of the present application is shown in the figure;

[0062] Figure 2 The structural schematic diagram of the winding device provided by some embodiments of the present application is shown in the figure;

[0063] Figure 3 The structural schematic diagram of the first bidirectional flattening mechanism provided by some embodiments of the present application is shown in the figure;

[0064] Figure 4A structure schematic view of a first bidirectional flattening mechanism provided for some embodiments of the present application;

[0065] Figure 5 A structure schematic view of a winding device provided for some embodiments of the present application;

[0066] Figure 6 A structure schematic view of a first conveying mechanism provided for some embodiments of the present application;

[0067] Figure 7 A structure schematic view of a second conveying mechanism provided for some embodiments of the present application;

[0068] Figure 8 A structure schematic view of a winding device provided for some embodiments of the present application;

[0069] Figure 9 A structure schematic view of a first buffering mechanism provided for some embodiments of the present application;

[0070] Figure 10 A structure schematic view of a second buffering mechanism provided for some embodiments of the present application;

[0071] Figure 11 A schematic block diagram of a first detection mechanism connected with a first winding and unwinding mechanism provided for some embodiments of the present application;

[0072] Figure 12 A schematic block diagram of a second detection mechanism connected with a first winding and unwinding mechanism provided for some embodiments of the present application.

[0073] Icon: 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 bidirectional smoothing mechanism; 410-pass roller; 420-first smoothing piece; 421-first smoothing part; 422-first guide part; 423-second guide part; 430-first gap; 500-first conveying mechanism; 510-first driving roller; 511-second gap; 520-first driven roller; 530-second smoothing piece; 531-second smoothing part; 532-third guide part; 533-fourth guide part; 540-third gap; 600-second conveying mechanism; 610-second driving roller; 620-second driven roller; 630-fourth gap; 700-first buffering mechanism; 710-first fixed roller set; 711-first fixed roller; 720-first movable roller set; 721-first movable roller; 800-second buffering mechanism; 810-second fixed roller set; 811-second fixed roller; 820-second movable roller set; 821-second movable roller; 910-first detection mechanism; 920-second detection mechanism; 930-correcting mechanism; 20-pole piece; 30-separation film. DETAILED DESCRIPTION

[0074] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0076] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0077] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0079] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0080] "Multiple" appearing in the present application means two or more (including two).

[0081] In the present application, the battery cell can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are also not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, and the present application embodiments are also not limited thereto.

[0082] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell to some extent.

[0083] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator film. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that the fuse does not occur when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator film can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure, and the embodiments of the present application are not limited thereto.

[0084] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace, etc. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0085] The battery includes an electrode assembly, and the electrode assembly is a component in which an electrochemical reaction occurs in the battery. The electrode assembly includes a winding type electrode assembly and a laminated type electrode assembly. At present, the production cost of the winding type electrode assembly is high.

[0086] For the production of the winding type electrode assembly, the existing technology generally unwinds the tab and the separator film through the unwinding mechanism, and winds the tab and the separator film to form the winding type electrode assembly through the winding mechanism. The electrode assembly that does not meet the design requirements is discarded, resulting in the waste of the whole electrode assembly, so that the production cost of the winding type electrode assembly is high.

[0087] In view of this, the embodiment of the present application provides a winding device, which comprises a first winding and unwinding mechanism, a second winding and unwinding mechanism and a winding mechanism. The first winding and unwinding mechanism is used for winding or unwinding a pole piece. The second winding and unwinding mechanism is used for winding or unwinding a separator film. The winding mechanism is configured to wind the pole piece and the separator film when the first winding and unwinding mechanism and the second winding and unwinding mechanism are unwinding, and to unwind the pole piece and the separator film when the first winding and unwinding mechanism and the second winding and unwinding mechanism are winding.

[0088] In normal winding, the first winding and unwinding mechanism unwinds the pole piece, and the second winding and unwinding mechanism unwinds the separator film. The pole piece unwound by the first winding and unwinding mechanism and the separator film unwound by the second winding and unwinding mechanism are wound to form an electrode assembly by the winding mechanism. When it is found that the wound electrode assembly does not meet the design requirements, the first winding and unwinding mechanism winds the pole piece, and the second winding and unwinding mechanism winds the separator film. The electrode assembly wound by the winding mechanism is unwound, and after manual or automatic correction, the first winding and unwinding mechanism unwinds the pole piece, and the second winding and unwinding mechanism unwinds the separator film. The rewound electrode assembly meets the design requirements by the winding mechanism, and the entire electrode assembly does not have to be wasted, thereby reducing production cost.

[0089] The technical solution described in the embodiment of the present application is applicable to manufacturing a wound electrode assembly, and is conducive to reducing production cost.

[0090] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the winding device 10 provided by some embodiments of the present application is shown. The embodiment of the present application provides a winding device 10, which comprises a first winding and unwinding mechanism 100, a second winding and unwinding mechanism 200 and a winding mechanism 300. The first winding and unwinding mechanism 100 is used for winding or unwinding a pole piece 20. The second winding and unwinding mechanism 200 is used for winding or unwinding a separator film 30. The winding mechanism 300 is configured to wind the pole piece 20 and the separator film 30 when the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 are unwinding, and to unwind the pole piece 20 and the separator film 30 when the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 are winding.

[0091] The first winding and unwinding mechanism 100 is a mechanism for winding or unwinding the pole piece 20. The pole piece 20 can be a positive pole piece or a negative pole piece. Generally, the winding device 10 comprises at least two first winding and unwinding mechanisms 100. At least one first winding and unwinding mechanism 100 is used for winding or unwinding a negative pole piece, and at least one first winding and unwinding mechanism 100 is used for winding or unwinding a positive pole piece. Please refer to Figure 1 , in Figure 1 the embodiment shown, the winding device 10 comprises two first winding and unwinding mechanisms 100. One of the first winding and unwinding mechanisms 100 is used for winding or unwinding a negative pole piece, and the other first winding and unwinding mechanism 100 is used for winding or unwinding a positive pole piece.

[0092] Optionally, the first winding and unwinding mechanism 100 comprises a first winding and unwinding roller 110 and a first driving member. The first winding and unwinding roller 110 is configured to set the jelly-roll of the electrode plate. The first driving member is connected to the first winding and unwinding roller 110 and is configured to drive the first winding and unwinding roller 110 to rotate forward or reverse. When the first driving member drives the first winding and unwinding roller 110 to rotate forward, the first winding and unwinding roller 110 unwinds the electrode plate 20. When the first driving member drives the first winding and unwinding roller 110 to rotate reverse, the first winding and unwinding roller 110 winds the electrode plate 20.

[0093] The second winding and unwinding mechanism 200 is configured to wind or unwind the separator film 30. The separator film 30 is arranged between the positive electrode plate and the negative electrode plate and is configured to separate the positive electrode plate and the negative electrode plate to reduce the risk of short circuit between the positive electrode plate and the negative electrode plate. The separator film 30 has a large number of through micro-holes and can ensure the free passage of electrolyte ions and has good penetration to metal ions. Please refer to Figure 1 In the embodiment shown in FIG. 1, the winding device 10 comprises two second winding and unwinding mechanisms 200. Along the winding direction of the winding mechanism 300, the negative electrode plate, the separator film 30 unwound by one of the second winding and unwinding mechanisms 200, the positive electrode plate, and the separator film 30 unwound by the other second winding and unwinding mechanism 200 are sequentially stacked into the winding mechanism 300. Figure 1 Optionally, the second winding and unwinding mechanism 200 comprises a second winding and unwinding roller 210 and a second driving member. The second winding and unwinding roller 210 is configured to set the jelly-roll of the separator film. The second driving member is connected to the second winding and unwinding roller 210 and is configured to drive the second winding and unwinding roller 210 to rotate forward or reverse. When the second driving member drives the second winding and unwinding roller 210 to rotate forward, the second winding and unwinding roller 210 unwinds the separator film 30. When the second driving member drives the second winding and unwinding roller 210 to rotate reverse, the second winding and unwinding roller 210 winds the separator film 30.

[0094] Please refer to

[0095] In the embodiment shown in FIG. 1, the winding device 10 comprises two first winding and unwinding mechanisms 100 and two second winding and unwinding mechanisms 200. Along the winding direction of the winding mechanism 300, one of the first winding and unwinding mechanisms 100, one of the second winding and unwinding mechanisms 200, the other of the first winding and unwinding mechanisms 100, and the other of the second winding and unwinding mechanisms 200 are sequentially arranged. Figure 1 Figure 1

[0096] ​​The winding mechanism 300 is a mechanism for winding the electrode tab 20 and the separator film 30 to form an electrode assembly. Generally, the winding mechanism 300 includes a winding needle, and the electrode tab 20 and the separator film 30 are wound to form an electrode assembly by the winding needle. In the embodiment of the present application, the winding needle can be forward rotated or reverse rotated. When the first winding and unwinding mechanism 100 unwinds the electrode tab 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30, the winding needle can be forward rotated to wind the electrode tab 20 and the separator film 30. When the first winding and unwinding mechanism 100 winds the electrode tab 20 and the second winding and unwinding mechanism 200 winds the separator film 30, the winding needle can be reverse rotated to unwind the wound electrode tab 20 and the separator film 30.

[0097] It should be noted that whether the electrode assembly wound by the winding mechanism 300 meets the design requirements can be determined by manual or detection mechanism. When the electrode assembly wound by the winding mechanism 300 does not meet the design requirements, the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 can be controlled by manual or controller to wind.

[0098] In normal winding, the first winding and unwinding mechanism 100 unwinds the electrode tab 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30, and the electrode tab 20 unwound by the first winding and unwinding mechanism 100 and the separator film 30 unwound by the second winding and unwinding mechanism 200 are wound to form an electrode assembly by the winding mechanism 300. When it is found that the wound electrode assembly does not meet the design requirements, the first winding and unwinding mechanism 100 winds the electrode tab 20 and the second winding and unwinding mechanism 200 winds the separator film 30, so that the electrode assembly wound by the winding mechanism 300 is unwound, and after manual or automatic correction, the first winding and unwinding mechanism 100 unwinds the electrode tab 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30, and the rewound electrode assembly meets the design requirements by rewinding by the winding mechanism 300, so that the entire electrode assembly does not have to be wasted, thereby reducing production cost.

[0099] Please refer to Figure 2 , Figure 2 The structure schematic diagram of the winding device 10 provided by some other embodiments of the present application is shown. The winding device 10 further includes a first bidirectional flattening mechanism 400, which is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. The first bidirectional flattening mechanism 400 is configured to be able to flatten the electrode tab 20 when the first winding and unwinding mechanism 100 winds or unwinds.

[0100] The first bidirectional flattening mechanism 400 is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the electrode tab 20, the first bidirectional flattening mechanism 400 is arranged between the first winding and unwinding mechanism 100 and the winding mechanism 300.

[0101] The first bidirectional flattening mechanism 400 is used for flattening the pole piece 20 when the first winding and unwinding mechanism 100 winds up, and is also used for flattening the pole piece 20 when the first winding and unwinding mechanism 100 unwinds. That is, the first bidirectional flattening mechanism 400 can flatten the pole piece 20 when the pole piece 20 is conveyed in a forward direction, and can also flatten the pole piece 20 when the pole piece 20 is conveyed in a reverse direction, thereby achieving bidirectional flattening of the pole piece 20.

[0102] The pole piece 20 includes a pole lug, and the first bidirectional flattening mechanism 400 can also flatten the pole lug, thereby reducing the risk of the pole lug being folded, creased, or wrinkled.

[0103] When the first winding and unwinding mechanism 100 unwinds the pole piece 20, the first bidirectional flattening mechanism 400 can flatten the pole piece 20 unwound by the first winding and unwinding mechanism 100, thereby reducing the risk of the pole piece 20 being wrinkled, and facilitating the electrode assembly wound by the winding mechanism 300 to meet the design requirements. When the first winding and unwinding mechanism 100 winds up the pole piece 20, the electrode assembly wound by the winding mechanism 300 is unwound, and the first bidirectional flattening mechanism 400 can flatten the pole piece 20 unwound by the winding mechanism 300, thereby reducing the risk of the pole piece 20 being wrinkled, and facilitating the pole piece 20 to be smoothly wound up to the first winding and unwinding mechanism 100, thereby facilitating rewinding.

[0104] Please refer to Figure 2 and Figure 3 , Figure 3 The first bidirectional flattening mechanism 400 provided in some embodiments of the present application is shown in a structural schematic view. In some embodiments, the first bidirectional flattening mechanism 400 includes a passing roller 410 and a first flattening piece 420, and the first flattening piece 420 and the passing roller 410 have a first gap 430 therebetween, which is used for the pole piece 20 to pass through. The first flattening piece 420 and the passing roller 410 are used to cooperate to flatten the pole piece 20.

[0105] The passing roller 410 is used for the pole piece 20 to pass around. The first flattening piece 420 is gap-set with the passing roller 410, and the first flattening piece 420 and the passing roller 410 form the first gap 430 therebetween, which is used for the pole piece 20 to pass through. In the process of the pole piece 20 passing through the first gap 430, the first flattening piece 420 and the passing roller 410 cooperate to flatten the pole piece 20.

[0106] When the first winding and unwinding mechanism 100 unwinds the pole piece 20, the pole piece 20 can pass through the first gap 430 formed between the first flattening member 420 and the over roller 410 in a forward direction and be flattened by the first flattening member 420 and the over roller 410, reducing the risk of creasing the pole piece 20. When the first winding and unwinding mechanism 100 winds up the pole piece 20, the electrode assembly wound by the winding mechanism 300 is unwound, the pole piece 20 can pass through the first gap 430 formed between the first flattening member 420 and the over roller 410 in a reverse direction and be flattened by the first flattening member 420 and the over roller 410, reducing the risk of creasing the pole piece 20.

[0107] Please refer to Figure 2 and Figure 3 In some embodiments, the first flattening member 420 includes a first flattening portion 421, a first guide portion 422, and a second guide portion 423. The first flattening portion 421 forms the first gap 430 with the outer circumferential surface of the over roller 410. The first guide portion 422 and the second guide portion 423 are respectively connected to two sides of the first flattening portion 421 along the conveying direction of the pole piece 20. The first guide portion 422 is configured to guide the pole piece 20 to the first gap 430 when the first winding and unwinding mechanism 100 unwinds, and the second guide portion 423 is configured to guide the pole piece 20 to the first gap 430 when the first winding and unwinding mechanism 100 winds up.

[0108] The first flattening portion 421 forms the first gap 430 with the outer circumferential surface of the over roller 410. The first guide portion 422 is connected to one end of the first flattening portion 421 along the conveying direction of the pole piece 20, and the second guide portion 423 is connected to the other end of the first flattening portion 421.

[0109] The first guide portion 422 and the second guide portion 423 are respectively used to guide the pole piece 20 into the first gap 430 when the pole piece 20 is conveyed in a forward direction and in a reverse direction, thereby flattening the pole piece 20.

[0110] The first guide portion 422 is configured to guide the pole piece 20 to the first gap 430 when the first winding and unwinding mechanism 100 unwinds, thereby achieving forward flattening of the pole piece 20. The second guide portion 423 is configured to guide the pole piece 20 to the first gap 430 when the first winding and unwinding mechanism 100 winds up, thereby achieving reverse flattening of the pole piece 20. In this way, the pole piece 20 can be flattened regardless of whether the first winding and unwinding mechanism 100 winds up or unwinds, reducing the risk of creasing the pole piece 20 and facilitating rewinding by the winding mechanism 300.

[0111] Please refer to Figure 2 and Figure 3 In some embodiments, the first guide portion 422 and the second guide portion 423 are both bent away from the over roller 410 compared to the first flattening portion 421.

[0112] The first guiding portion 422 is bent away from the passing roller 410 compared with the first smoothing portion 421. The first guiding portion 422 can extend along a straight line trajectory, or extend along an arc trajectory. The connection position between the first guiding portion 422 and the first smoothing portion 421 can adopt a round corner transition to reduce the stress on the pole piece 20.

[0113] Similarly, the second guiding portion 423 is bent away from the passing roller 410 compared with the first smoothing portion 421. The second guiding portion 423 can extend along a straight line trajectory, or extend along an arc trajectory. The connection position between the second guiding portion 423 and the first smoothing portion 421 can adopt a round corner transition to reduce the stress on the pole piece 20.

[0114] By bending the first guiding portion 422 away from the passing roller 410 compared with the first smoothing portion 421, the pole piece 20 can be guided into the first gap 430 when the first winding and unwinding mechanism 100 unwinds, so as to realize the forward smoothing of the pole piece 20. By bending the second guiding portion 423 away from the passing roller 410 compared with the first smoothing portion 421, the pole piece 20 can be guided into the first gap 430 when the first winding and unwinding mechanism 100 winds, so as to realize the reverse smoothing of the pole piece 20.

[0115] Please refer to Figure 3 and Figure 4 In some embodiments, the first guiding portion 422 and the second guiding portion 423 extend along an arc trajectory.

[0116] The first guiding portion 422 and the second guiding portion 423 both extend along an arc trajectory, so that the first guiding portion 422 and the second guiding portion 423 are relatively smooth, the transition is smooth, and the stress on the pole piece 20 can be reduced, and the risk of damage to the pole piece 20 can be reduced.

[0117] Please refer to Figure 4 In some embodiments, the first smoothing portion 421 extends along a straight line trajectory. At this time, the first smoothing portion 421 can be a flat plate structure.

[0118] When the first smoothing portion 421 extends along a straight line trajectory, the length of the first gap 430 is relatively short, the pole piece 20 can quickly pass through the first gap 430, the external force on the pole piece 20 is relatively small, and the risk of damage to the pole piece 20 is relatively small.

[0119] Please refer to Figure 4 , Figure 4 The structure schematic diagram of the first bidirectional smoothing mechanism 400 provided by another embodiment of the present application is shown. In another embodiment, the first smoothing portion 421 extends along an arc trajectory, and the center of the arc trajectory is located on the axis of the passing roller 410.

[0120] The first smoothing portion 421 extends along the arc track, and the cross section of the first smoothing portion 421 is an arc-shaped structure. The axis of the roller 410 passes through the center of the arc track. In other words, when the first smoothing portion 421 extends along the arc track, the first smoothing portion 421 can be arranged around the outside of the roller 410. Please refer to Figure 2 ,exist Figure 5 In the illustrated embodiment, the first smoothing portion 421 half surrounds the roller 410 .

[0121] 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.

[0122] Please refer to Figure 5 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 .

[0123] 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 .

[0124] 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 .

[0125] 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.

[0126] 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 .

[0127] 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.

[0128] Please refer to Figure 5 , Figure 6A structural schematic diagram of the winding device 10 is provided for some embodiments of the present application. In some embodiments, the winding device 10 comprises a first conveying mechanism 500, which is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300, and is configured to convey the pole piece 20 in a forward direction or a reverse direction.

[0129] The first conveying mechanism 500 is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the pole piece 20, the first conveying mechanism 500 is arranged between the first winding and unwinding mechanism 100 and the winding mechanism 300.

[0130] The first conveying mechanism 500 is configured to convey the pole piece 20 in a forward direction or a reverse direction. The first conveying mechanism 500 can have a cooperative relationship with the first winding and unwinding mechanism 100. For example, when the first winding and unwinding mechanism 100 unwinds, the first conveying mechanism 500 conveys the pole piece 20 in a forward direction. When the first winding and unwinding mechanism 100 winds, the first conveying mechanism 500 conveys the pole piece 20 in a reverse direction.

[0131] By arranging the first conveying mechanism 500, sufficient power is provided for conveying the pole piece 20 in a forward direction or a reverse direction, and the conveying speed of the pole piece 20 is accelerated, especially when the conveying path of the pole piece 20 is long. In addition, the first conveying mechanism 500 can form a tension break, so that the tension of the pole piece 20 is balanced during conveying, and the risk of breakage of the pole piece 20 due to excessive tension is reduced.

[0132] Please refer to Figure 6 and Figure 5 , Figure 6 A structural schematic diagram of the first conveying mechanism 500 is provided for some embodiments of the present application. In some embodiments, the first conveying mechanism 500 comprises a first driving roller 520 and a first driven roller 510, and the first driven roller 520 and the first driving roller 510 have a second gap 511 therebetween for the pole piece 20 to pass through. The first driving roller 510 is configured to be able to rotate in a forward direction or a reverse direction, so as to convey the pole piece 20 in a forward direction or a reverse direction in cooperation with the first driven roller 520.

[0133] The first driving roller 510 is able to rotate actively under the action of a driving mechanism, so as to actively convey the pole piece 20. The first driven roller 520 has no driving mechanism and is unable to rotate actively, but is able to rotate under the action of the pole piece 20.

[0134] The first driving roller 510 and the first driven roller 520 are arranged with a gap therebetween, and the first driving roller 510 and the first driven roller 520 form the second gap 511 therebetween for the pole piece 20 to pass through. In other words, along the thickness direction of the pole piece 20, the first driving roller 510 and the first driven roller 520 are respectively located on two sides of the pole piece 20.

[0135] The first driving roller 510 can rotate forward to cooperate with the first driven roller 520 to positively feed the pole piece 20. The first driving roller 510 can rotate reversely to cooperate with the first driven roller 520 to reversely feed the pole piece 20.

[0136] The first driving roller 510 and the first driven roller 520 have a second gap 511 therebetween, through which the pole piece 20 can pass. When the first driving roller 510 rotates forward, the first driving roller 510 and the first driven roller 520 cooperate to positively feed the pole piece 20. When the first driving roller 510 rotates reversely, the first driving roller 510 and the first driven roller 520 cooperate to reversely feed the pole piece 20.

[0137] Please refer to Figure 5 and Figure 5 In some embodiments, the first feeding mechanism 500 further comprises a second bidirectional flattening mechanism, which is arranged upstream and / or downstream of the first driving roller 510. The second bidirectional flattening mechanism is configured to flatten the pole piece 20 when the first driving roller 510 and the first driven roller 520 cooperate to positively or reversely feed the pole piece 20.

[0138] The second bidirectional flattening mechanism is used to flatten the pole piece 20 when the first driving roller 510 and the first driven roller 520 cooperate to positively feed the pole piece 20, and is also used to flatten the pole piece 20 when the first driving roller 510 and the first driven roller 520 cooperate to reversely feed the pole piece 20.

[0139] The second bidirectional flattening mechanism can be arranged only upstream of the first driving roller 510, or only downstream of the first driving roller 510, or both upstream and downstream of the first driving roller 510. Please refer to Figure 5 In the embodiment shown in Figure 6 , the second bidirectional flattening mechanism is arranged both upstream and downstream of the first driving roller 510.

[0140] By arranging the second bidirectional flattening mechanism upstream and / or downstream of the first driving roller 510, the pole piece 20 is flattened before passing through the second gap 511, reducing the risk of creased tabs entering the second gap 511, so that the pole piece 20 is less likely to be damaged by the cooperation of the first driving roller 510 and the first driven roller 520.

[0141] Please refer to Figure 5 and Figure 6 In some embodiments, the second bidirectional flattening mechanism comprises two second flattening pieces 530, and the two second flattening pieces 530 have a third gap 540 therebetween. The third gap 540 is used for the pole piece 20 to pass through, and the two second flattening pieces 530 are used to cooperate to flatten the pole piece 20.

[0142] The two second smoothing members 530 are arranged in a gap, and a third gap 540 is formed between the two second smoothing members 530 for the passage of the pole piece 20. In other words, along the thickness direction of the pole piece 20, the two second smoothing members 530 are respectively located on both sides of the pole piece 20. During the passage of the pole piece 20 from the third gap 540, the two second smoothing members 530 cooperate to smooth the pole piece 20.

[0143] When the first driving roller 510 rotates forward, the pole piece 20 can pass through the third gap 540 formed between the two second smoothing members 530 in a forward direction, and be smoothed by the two second smoothing members 530, thereby reducing the risk of wrinkling of the pole piece 20. When the first driving roller 510 rotates reversely, the electrode assembly wound by the winding mechanism 300 is unwound, and the pole piece 20 can pass through the third gap 540 formed between the two second smoothing members 530 in a reverse direction, and be smoothed by the two second smoothing members 530, thereby reducing the risk of wrinkling of the pole piece 20.

[0144] Please refer to Figure 5 and Figure 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 the second smoothing portions 531 of the two second smoothing members 530 form the third gap 540. Along the conveying direction of the pole piece 20, the third guide portion 532 and the fourth guide portion 533 are respectively connected to both sides of the second smoothing portion 531. The third guide portion 532 is configured to guide the pole piece 20 to the third gap 540 when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 in a forward direction, and the fourth guide portion 533 is configured to guide the pole piece 20 to the third gap 540 when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 in a reverse direction.

[0145] The second smoothing portion 531 of one second smoothing member 530 and the second smoothing portion 531 of another corresponding second smoothing member 530 form the third gap 540. Along the conveying direction of the pole piece 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.

[0146] The third guide portion 532 and the fourth guide portion 533 are respectively used to guide the pole piece 20 into the third gap 540 when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 in a forward direction and when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 in a reverse direction, thereby smoothing the pole piece 20.

[0147] The third guiding part 532 is configured to guide the pole piece 20 to the third gap 540 when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 forward, so as to realize forward smoothing of the pole piece 20. The fourth guiding part 533 is configured to guide the pole piece 20 to the third gap 540 when the first driving roller 510 and the first driven roller 520 cooperate to convey the pole piece 20 reversely, so as to realize reverse smoothing of the pole piece 20. In this way, the pole piece 20 can be smoothed no matter the first driving roller 510 rotates forward or reversely, which reduces the risk of wrinkling of the pole piece 20 and facilitates rewinding of the winding mechanism 300.

[0148] Please refer to Figure 6 and Figure 6 In some embodiments, the third guiding part 532 and the fourth guiding part 533 of each second smoothing part 530 are both bent away from the other second smoothing part 530 compared with the second smoothing part 531.

[0149] The third guiding part 532 of one second smoothing part 530 is bent away from the other second smoothing part 530 corresponding to the second smoothing part 530 compared with the second smoothing part 531 of the second smoothing part 530. Optionally, the third guiding part 532 can extend along a straight line trajectory, or the third guiding part 532 can extend along an arc trajectory. The connection position of the third guiding part 532 and the second smoothing part 531 can adopt a rounded transition to reduce stress on the pole piece 20.

[0150] Similarly, the fourth guiding part 533 of one second smoothing part 530 is bent away from the other second smoothing part 530 corresponding to the second smoothing part 530 compared with the second smoothing part 531 of the second smoothing part 530. Optionally, the fourth guiding part 533 can extend along a straight line trajectory, or the fourth guiding part 533 can extend along an arc trajectory. The connection position of the fourth guiding part 533 and the second smoothing part 531 can adopt a rounded transition to reduce stress on the pole piece 20.

[0151] By bending the third guiding part 532 away from the other second smoothing part 530 compared with the second smoothing part 531, the pole piece 20 can be guided into the third gap 540 when the first driving roller 510 rotates forward, so as to realize forward smoothing of the pole piece 20. By bending the fourth guiding part 533 away from the other second smoothing part 530 compared with the second smoothing part 531, the pole piece 20 can be guided into the third gap 540 when the first driving roller 510 rotates reversely, so as to realize reverse smoothing of the pole piece 20.

[0152] Please refer to Figure 5 In some embodiments, the third guiding part 532 and the fourth guiding part 533 extend along an arc trajectory.

[0153] The third guide part 532 and the fourth guide part 533 each extend along a circular arc trajectory, so that the third guide part 532 and the fourth guide part 533 are relatively smooth, the transition is smooth, the stress on the pole piece 20 can be reduced, and the risk of damage to the pole piece 20 is reduced.

[0154] Please refer to Figure 6 In some embodiments, the second smoothing part 531 extends along a straight line trajectory. At this time, the second smoothing part 531 can be a flat plate structure.

[0155] When the second smoothing part 531 extends along a straight line trajectory, the pole piece 20 is subjected to a smaller external force, and the risk of damage to the pole piece 20 is smaller.

[0156] In other embodiments, the second smoothing part 531 extends along a circular arc trajectory, and the centers of the circular arc trajectories of the second smoothing parts 531 of the two second smoothing parts 530 coincide.

[0157] When the second smoothing part 531 extends along a circular arc trajectory, the pole piece 20 can be bent, so as to change the tape running direction.

[0158] Please refer to Figure 5 and Figure 7 In some embodiments, the winding device 10 comprises a plurality of first conveying mechanisms 500, and the plurality of first conveying mechanisms 500 are arranged along the conveying direction of the pole piece 20. Along the conveying direction of the pole piece 20, the first conveying mechanism 500 closest to the winding mechanism 300 is used to guide the pole piece 20 into the winding mechanism 300.

[0159] The winding device 10 can comprise 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 pole piece 20.

[0160] Among them, along the conveying direction of the pole piece 20, the first conveying mechanism 500 closest to the winding mechanism 300 in the plurality of first conveying mechanisms 500 can be used as a guide mechanism to guide the pole piece 20 into the winding mechanism 300.

[0161] The first conveying mechanism 500 closest to the winding mechanism 300 can guide the pole piece 20 into the winding mechanism 300, further reduce the risk of creases of the pole piece 20 wound by the winding mechanism 300, and help the wound electrode assembly to meet the design requirements, thereby reducing the production cost.

[0162] Please refer to Figure 7 and Figure 5 , Figure 7A structural schematic diagram of the second conveying mechanism 600 provided for some embodiments of the present application. In some embodiments, the winding device 10 further comprises a second conveying mechanism 600, which is located downstream of the second winding and unwinding mechanism 200 and upstream of the winding mechanism 300, and is used for forward or reverse conveying of the isolation film 30.

[0163] The second conveying mechanism 600 is located downstream of the second winding and unwinding mechanism 200 and upstream of the winding mechanism 300. In other words, along the conveying direction of the isolation film 30, the second conveying mechanism 600 is arranged between the second winding and unwinding mechanism 200 and the winding mechanism 300.

[0164] The second conveying mechanism 600 is used for forward or reverse conveying of the isolation film 30. The second conveying mechanism 600 can have a cooperative relationship with the second winding and unwinding mechanism 200. For example, when the second winding and unwinding mechanism 200 unwinds, the first conveying mechanism 500 conveys the isolation film 30 forward. When the second winding and unwinding mechanism 200 winds, the second conveying mechanism 600 conveys the isolation film 30 reversely.

[0165] By arranging the second conveying mechanism 600, sufficient power is provided for forward or reverse conveying of the isolation film 30, and the conveying speed of the isolation film 30 is accelerated, which is particularly effective when the conveying path of the isolation film 30 is long. In addition, the second conveying mechanism 600 can form a tension break, so that the tension of the isolation film 30 is balanced during conveying, and the risk of breakage of the isolation film 30 due to excessive tension is reduced.

[0166] Please refer to Figure 8 and Figure 8 In some embodiments, the second conveying mechanism 600 comprises a second driven roller 620 and a second driving roller 610, and the second driving roller 610 and the second driven roller 620 have a fourth gap 630 therebetween for the isolation film 30 to pass through. The second driving roller 610 is configured to be able to rotate forward or reversely to cooperate with the second driven roller 620 to convey the isolation film 30 forward or reversely.

[0167] The second driving roller 610 can be driven to rotate by a driving mechanism to actively convey the isolation film 30. The second driven roller 620 has no driving mechanism and cannot be driven to rotate, but can be rotated by the isolation film 30.

[0168] The second driving roller 610 and the second driven roller 620 are arranged with a gap therebetween, and the fourth gap 630 is formed between the second driving roller 610 and the second driven roller 620 for the pole piece 20 to pass through. In other words, along the thickness direction of the isolation film 30, the second driving roller 610 and the second driven roller 620 are respectively located on both sides of the isolation film 30.

[0169] The second driving roller 610 can rotate forward to cooperate with the second driven roller 620 to positively feed the separator film 30. The second driving roller 610 can rotate reversely to cooperate with the second driven roller 620 to reversely feed the separator film 30.

[0170] The second driving roller 610 and the second driven roller 620 have a fourth gap 630 therebetween, through which the separator film 30 can pass. When the second driving roller 610 rotates forward, the second driving roller 610 and the second driven roller 620 cooperate to positively feed the separator film 30. When the second driving roller 610 rotates reversely, the second driving roller 610 and the second driven roller 620 cooperate to reversely feed the separator film 30.

[0171] Please refer to Figure 8 , Figure 9 A structure schematic diagram of the winding device 10 is provided for further embodiments of the present application. In further embodiments, the winding device 10 comprises a first buffer mechanism 700, which is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. The first buffer mechanism 700 is used to buffer the pole piece 20.

[0172] The first buffer mechanism 700 is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. In other words, along the feeding direction of the pole piece 20, the first buffer mechanism 700 is arranged between the first winding and unwinding mechanism 100 and the winding mechanism 300.

[0173] The first buffer mechanism 700 is used to buffer the pole piece 20. The pole piece 20 unwound by the first winding and unwinding mechanism 100 can be buffered in the first buffer mechanism 700, and the pole piece 20 unwound by the winding mechanism 300 can also be buffered in the first buffer mechanism 700. The pole piece 20 buffered in the first buffer mechanism 700 can be provided to the first winding and unwinding mechanism 100 or to the winding mechanism 300.

[0174] In the initial stage of starting the winding device 10, the first winding and unwinding mechanism 100 cannot unwind too fast, otherwise it is easy to cause the pole piece 20 to break. By arranging the first buffer mechanism 700, in the initial stage of starting the winding device 10, the pole piece 20 buffered in the first buffer mechanism 700 can be quickly released to supply the winding mechanism 300, while the first winding and unwinding mechanism 100 is slowly accelerated, so that 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 wound electrode assembly can be unwound and the pole piece 20 can be buffered in the first buffer mechanism 700, instead of being wound into the first winding and unwinding mechanism 100. When rewinding, the pole piece 20 buffered in the first buffer mechanism 700 can be released. In this way, the path of the pole piece 20 fed forward and reversely is shortened, which is beneficial to reduce the rewinding time, accelerate the rewinding efficiency, and thus reduce the production cost.

[0175] Please refer to Figure 9 and Figure 9 , Figure 9 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.

[0176] 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.

[0177] 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.

[0178] Along the first direction, the first fixed roller group 710 and the first movable roller group 720 are spaced apart. Correspondingly, the first fixed roller 711 and the first movable roller 721 are spaced apart along the first direction. Figure 9 , the first direction may be direction A shown in the figure.

[0179] The pole piece 20 is alternately wound around the first fixed roller 711 and the first movable roller 721. Figure 9 ,exist Figure 9 In the illustrated embodiment, 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 passes 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.

[0180] The first driving mechanism is connected to the first movable roller 721 and is used to drive the first movable roller 721 to move in the first direction. The first driving mechanism can include a linear driving member connected to the first movable roller 721 and driving the first movable roller 721 to move in the first direction. The linear driving member can be a linear electric cylinder, a linear pneumatic cylinder, a linear hydraulic cylinder, or the like. The first driving mechanism can also include a rotating driving member and a transmission mechanism. The rotating driving member is connected to the first movable roller 721 through the transmission mechanism, and the transmission mechanism converts the rotating motion output by the rotating driving member into the linear motion of the first movable roller 721 in the first direction. The rotating driving member can be an electric motor, an internal combustion engine, or the like. The transmission mechanism can be a crank slider mechanism, a screw nut mechanism, or the like.

[0181] The pole piece 20 is alternately arranged around the first fixed roller 711 and the first movable roller 721. When it is necessary to buffer the pole piece 20, the first driving mechanism can drive the first movable roller 721 to move 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 achieve buffering of the pole piece 20. When it is necessary to release the pole piece 20, the first driving mechanism can drive the first movable roller 721 to move towards 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 achieve release of the pole piece 20.

[0182] Please refer to Figure 8 In some embodiments, the first fixed roller group 710 includes a plurality of first fixed rollers 711, and the plurality of first fixed rollers 711 are arranged at intervals in the second direction. And / or the first movable roller group 720 includes a plurality of first movable rollers 721, and the plurality of first movable rollers 721 are arranged at intervals in the second direction. Wherein, the second direction intersects the first direction.

[0183] The angle between the second direction and the first direction can be an acute angle, and the angle between the second direction and the first direction can also be a right angle. Please refer to Figure 8 In the embodiment shown in Figure 10 , the second direction is the B direction shown in the figure. At this time, the second direction is perpendicular to the first direction.

[0184] The first fixed roller group 710 can 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 arranged at intervals along the second direction.

[0185] The first movable roller group 720 can 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 arranged at intervals along the second direction.

[0186] By setting the plurality of first fixed rollers 711 and the plurality of first movable rollers 721, the length of the cached pole piece 20 can be increased by making the pole piece 20 alternately pass by the first fixed rollers 711 and the first movable rollers 721.

[0187] Please refer to Figure 10 In some embodiments, the winding device 10 comprises a first conveying mechanism 500 and a first caching mechanism 700. The first conveying mechanism 500 is used to forward or reverse convey the pole piece 20. The first caching mechanism 700 is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300, and is used to cache the pole piece 20. The upstream and downstream of the first caching mechanism 700 are both provided with the first conveying mechanism 500.

[0188] The first conveying mechanism 500 is used to forward or reverse convey the pole piece 20. The first conveying mechanism 500 can have a cooperative relationship with the first winding and unwinding mechanism 100. For example, when the first winding and unwinding mechanism 100 unwinds, the first conveying mechanism 500 forwards the pole piece 20. When the first winding and unwinding mechanism 100 winds, the first conveying mechanism 500 reverses the pole piece 20.

[0189] The first caching mechanism 700 is located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. In other words, along the conveying direction of the pole piece 20, the first caching mechanism 700 is arranged between the first winding and unwinding mechanism 100 and the winding mechanism 300. The first caching mechanism 700 is used to cache the pole piece 20. The pole piece 20 unwound by the first winding and unwinding mechanism 100 can be cached in the first caching mechanism 700, and the pole piece 20 unwound by the winding mechanism 300 can also be cached in the first caching mechanism 700. The pole piece 20 cached in the first caching mechanism 700 can be provided to the first winding and unwinding mechanism 100 or the winding mechanism 300.

[0190] The upstream of the first caching mechanism 700 is provided with the first conveying mechanism 500, and the downstream of the first caching mechanism 700 is also provided with the first conveying mechanism 500.

[0191] By providing the first conveying mechanism 500 upstream and / or downstream of the first caching mechanism 700, the first conveying mechanism 500 can be facilitated to provide the pole piece 20 to the first caching mechanism 700 for caching, and the pole piece 20 can be quickly output when the first caching mechanism 700 releases the pole piece 20.

[0192] Please refer to Figure 8 and Figure 10 , Figure 10FIG. 8 is a schematic view of a second buffer mechanism 800 according to some embodiments of the present application. In some embodiments, the winding device 10 comprises the second buffer mechanism 800, which is located downstream of the second winding and unwinding mechanism 200 and upstream of the winding mechanism 300. The second buffer mechanism 800 is configured to buffer the separator film 30.

[0193] The second buffer mechanism 800 is located downstream of the second winding and unwinding mechanism 200 and upstream of the winding mechanism 300. In other words, along the conveying direction of the separator film 30, the second buffer mechanism 800 is arranged between the second winding and unwinding mechanism 200 and the winding mechanism 300.

[0194] The second buffer mechanism 800 is configured to buffer the separator film 30. The separator film 30 unwound by the second winding and unwinding mechanism 200 can be buffered in the second buffer mechanism 800, and the separator film 30 unwound by the winding mechanism 300 can also be buffered in the second buffer mechanism 800. The separator film 30 buffered in the second buffer mechanism 800 can be provided to the second winding and unwinding mechanism 200 or the winding mechanism 300.

[0195] At the initial stage of starting the winding device 10, the second winding and unwinding mechanism 200 cannot be unwound too fast, otherwise the separator film 30 can be broken. By providing the second buffer mechanism 800, at the initial stage of starting the winding device 10, the separator film 30 buffered in the second buffer mechanism 800 can be quickly released to supply the winding mechanism 300, and the second winding and unwinding mechanism 200 can be 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 wound electrode assembly wound by the winding mechanism 300 can be unwound and the separator film 30 can be buffered in the second buffer mechanism 800, instead of being wound in the second winding and unwinding mechanism 200. During rewinding, the separator film 30 buffered in the second buffer mechanism 800 can be released. In this way, the path of the forward conveying and reverse conveying of the separator film 30 is shortened, which is beneficial to reduce the rewinding time, accelerate the rewinding efficiency, and further reduce the production cost.

[0196] Please refer to Figure 10 and Figure 10 In some embodiments, the second buffer mechanism 800 comprises a second fixed roller set 810, a second movable roller set 820, and a second driving mechanism. The second fixed roller set 810 comprises at least one second fixed roller 811, and the second movable roller set 820 comprises 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 separator film 30 is alternately arranged around the second fixed roller 811 and the second movable roller 821. The second driving mechanism is connected to the second movable roller 821, and the second driving mechanism is configured to drive the second movable roller 821 to move along the third direction.

[0197] The second fixed roller set 810 includes at least one second fixed roller 811 which is fixed relative to the ground or the frame.

[0198] The second movable roller set 820 includes at least one second movable roller 821 which is movable relative to the ground or the frame.

[0199] The second fixed roller set 810 and the second movable roller set 820 are spaced apart along a third direction. Correspondingly, the second fixed roller 811 and the second movable roller 821 are spaced apart along the third direction. Please refer to Figure 8 The third direction can be the direction C shown in the figure.

[0200] The isolation film 30 is alternately wound around the second fixed roller 811 and the second movable roller 821. Please refer to Figure 10 In the embodiment shown in Figure 10 , the second fixed roller set 810 includes three second fixed rollers 811, the second movable roller set 820 includes two second movable rollers 821, and the isolation film 30 is sequentially wound around the second fixed roller 811 and the second movable roller 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.

[0201] The second driving mechanism is connected to the second movable roller 821 and is used to drive the second movable roller 821 to move along the third direction. The second driving mechanism can include a linear driving member which is connected to the second movable roller 821 and drives the second movable roller 821 to move along the third direction. The linear driving member can be a linear electric cylinder, a linear pneumatic cylinder, a linear hydraulic cylinder, etc. The second driving mechanism can also include a rotary driving member and a transmission mechanism, the rotary driving member is connected to the second movable roller 821 through the transmission mechanism, and the transmission mechanism converts the rotary motion output by the rotary driving member into the linear motion of the second movable roller 821 along the third direction. The rotary driving member can be an electric motor, an internal combustion engine, etc. The transmission mechanism can be a crank slider mechanism, a screw nut mechanism, etc.

[0202] The isolation film 30 is alternately wound around the second fixed roller 811 and the second movable roller 821. When it is needed to buffer the isolation film 30, the second driving mechanism can drive the second movable roller 821 to move away from the second fixed roller 811 along the third direction, so as to increase the distance between the second movable roller 821 and the second fixed roller 811, thereby achieving the buffering of the isolation film 30. When it is needed to release the isolation film 30, the second driving mechanism can drive the second movable roller 821 to move close to the second fixed roller 811 along the third direction, so as to reduce the distance between the second movable roller 821 and the second fixed roller 811, thereby achieving the release of the isolation film 30.

[0203] Please refer toFigure 10 and Figure 11 In some embodiments, the second fixed roller set 810 includes a plurality of second fixed rollers 811, and the plurality of second fixed rollers 811 are arranged along a fourth direction. In some embodiments, the second movable roller set 820 includes a plurality of second movable rollers 821, and the plurality of second movable rollers 821 are arranged along the fourth direction. In some embodiments, the fourth direction intersects the third direction.

[0204] The fourth direction can form an acute angle with the third direction, or the fourth direction can form a right angle with the third direction. Please refer to Figure 11 In the embodiments shown in Figure 11 , the fourth direction is the D direction shown in the figure. In this case, the fourth direction is perpendicular to the third direction.

[0205] The second fixed roller set 810 can 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 arranged along the fourth direction.

[0206] The second movable roller set 820 can 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 arranged along the fourth direction.

[0207] By arranging the plurality of second fixed rollers 811 and the plurality of second movable rollers 821, the length of the buffer isolation film 30 can be increased.

[0208] Please refer to Figure 12 , Figure 12 The first detection mechanism 910 provided in some embodiments of the present application is connected to the first winding and unwinding mechanism 100. In some embodiments, the winding device 10 includes the first detection mechanism 910, which is used to detect the misalignment amount of the tabs of the pole piece 20 wound on the winding mechanism 300. The first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 respond to the first detection mechanism 910.

[0209] The first detection mechanism 910 is a mechanism for detecting the misalignment amount of the tabs of the pole piece 20 wound on the winding mechanism 300. The misalignment amount of the tabs refers to the misalignment amount between the plurality of tabs of a pole piece 20 after winding. When the two tabs of a pole piece 20 are aligned after winding, the misalignment amount of the tabs is 0. When the two tabs of a pole piece 20 are misaligned after winding, the misalignment amount of the tabs is greater than 0. If the misalignment amount of the tabs exceeds a threshold value, the first winding and unwinding mechanism 100 winds the pole piece 20 in response to the first detection mechanism 910, and the second winding and unwinding mechanism 200 winds the isolation film 30 in response to the first detection mechanism 910.

[0210] In some embodiments, the first detection mechanism 910 comprises an industrial camera. The first detection mechanism 910 acquires image information of the electrode assembly wound by the winding mechanism 300 by taking a photo, and acquires the tab misalignment amount of the electrode tab 20 by analyzing the image information.

[0211] In other embodiments, the first detection mechanism 910 comprises a laser transmission sensor. The laser transmission sensor acquires the tab misalignment amount of the electrode tab 20 by analyzing the time length during which the tab blocks the laser transmission sensor.

[0212] The first detection mechanism 910 can be directly electrically connected with the first winding and unwinding mechanism 100, or indirectly electrically connected with the first winding and unwinding mechanism 100 through some intermediate component. For example, the winding device 10 comprises a controller, the first detection mechanism 910 is electrically connected with the controller, and the controller is electrically connected with the first winding and unwinding mechanism 100. When the first detection mechanism 910 detects that the tab misalignment amount of the electrode tab 20 is within the preset range, the controller controls the first winding and unwinding mechanism 100 to continue unwinding. When the first detection mechanism 910 detects that the tab misalignment amount of the electrode tab 20 exceeds the preset range, the controller controls the first winding and unwinding mechanism 100 to start winding.

[0213] The first detection mechanism 910 can be directly electrically connected with the second winding and unwinding mechanism 200, or indirectly electrically connected with the second winding and unwinding mechanism 200 through some intermediate component. For example, the winding device 10 comprises a controller, the first detection mechanism 910 is electrically connected with the controller, and the controller is electrically connected with the second winding and unwinding mechanism 200. When the first detection mechanism 910 detects that the tab misalignment amount of the electrode tab 20 is within the preset range, the controller controls the second winding and unwinding mechanism 200 to continue unwinding. When the first detection mechanism 910 detects that the tab misalignment amount of the electrode tab 20 exceeds the preset range, the controller controls the second winding and unwinding mechanism 200 to start winding.

[0214] By providing the first detection mechanism 910, it is convenient to detect the tab misalignment amount of the electrode tab 20. When the first detection mechanism 910 detects that the tab misalignment amount of the electrode tab 20 exceeds the threshold value, the first winding and unwinding mechanism 100 winds the electrode tab 20, and the second winding and unwinding mechanism 200 winds the separator film 30, so that the electrode assembly wound by the winding mechanism 300 is unwound, and after the tab misalignment amount is manually or automatically corrected, the first winding and unwinding mechanism 100 unwinds the electrode tab 20, the second winding and unwinding mechanism 200 unwinds the separator film 30, and the rewinding is performed by the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0215] Please refer to Figure 12In some embodiments, the winding mechanism 300 comprises a winding needle for winding the pole piece 20 and the separator film 30, and an adjusting assembly 310 for adjusting the winding radius of the winding needle, the adjusting assembly 310 being responsive to the first detection mechanism 910.

[0216] The winding mechanism 300 comprises a winding needle, and the pole piece 20 and the separator film 30 are wound to form an electrode assembly by the winding needle. In the embodiments of the present application, the winding needle can be positively rotated or reversely rotated. When the first winding and unwinding mechanism 100 unwinds the pole piece 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30, the winding needle can be positively rotated to wind the pole piece 20 and the separator film 30. When the first winding and unwinding mechanism 100 winds the pole piece 20 and the second winding and unwinding mechanism 200 winds the separator film 30, the winding needle can be reversely rotated to unwind the wound pole piece 20 and the separator film 30.

[0217] The adjusting assembly 310 can adjust the winding radius of the winding needle to correct the tab misalignment of the pole piece 20.

[0218] The first detection mechanism 910 can be directly electrically connected with the adjusting assembly 310 or indirectly electrically connected with the adjusting assembly 310 through an intermediate component. For example, the winding device 10 comprises a controller, the first detection mechanism 910 is electrically connected with the controller, and the controller is electrically connected with the adjusting assembly 310. When the first detection mechanism 910 detects that the tab misalignment of the pole piece 20 exceeds the preset range, the controller controls the adjusting assembly 310 to adjust the winding radius of the winding needle to correct the tab misalignment of the pole piece 20.

[0219] 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 winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 first wind to make the winding needle first release the wound pole piece 20 and the separator film 30, and then the adjusting assembly 310 adjusts the winding radius of the winding needle to correct the tab misalignment of the pole piece 20.

[0220] The adjusting assembly 310 can adjust the winding radius of the winding needle to automatically correct the tab misalignment. When the first detection mechanism 910 detects that the tab misalignment of the pole piece 20 exceeds the threshold value, the first winding and unwinding mechanism 100 winds the pole piece 20 and the second winding and unwinding mechanism 200 winds the separator film 30 to make the electrode assembly wound by the winding mechanism 300 unwind, and the adjusting assembly 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, and then the first winding and unwinding mechanism 100 unwinds the pole piece 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30 to rewinding by the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, without wasting the entire electrode assembly, thereby reducing the production cost.

[0221] In addition, when the amount of misalignment of the tab is corrected, the jelly-roll 20 and the separator 30 wound on the winding mechanism 300 can be completely unwound, or the jelly-roll 20 and the separator 30 wound on the winding mechanism 300 can be partially unwound.

[0222] Please refer to Figures 1-12 , ​ A second detection mechanism 920 provided for some embodiments of the present application is connected to the first winding and unwinding mechanism 100. In some embodiments, the winding device 10 includes two first winding and unwinding mechanisms 100, one of which is used to wind or unwind the negative electrode tab, and the other of which is used to wind or unwind the positive electrode tab. The winding device 10 further includes a second detection mechanism 920 for detecting the overhang of the negative electrode tab wound on the winding mechanism 300 beyond the positive electrode tab along the extension direction of the winding axis of the winding mechanism 300. The first winding and unwinding mechanism 100 is responsive to the second detection mechanism 920.

[0223] The winding device 10 includes two first winding and unwinding mechanisms 100, one of which is used to wind or unwind the negative electrode tab, and the other of which is used to wind or unwind the positive electrode tab. Optionally, the first winding and unwinding mechanism 100 includes a first winding and unwinding roller 110 for setting the electrode tab roll and a first driving member connected to the first winding and unwinding roller 110, the first driving member being used to drive the first winding and unwinding roller 110 to rotate forward or reverse. When the first driving member drives the first winding and unwinding roller 110 to rotate forward, the first winding and unwinding roller 110 unwinds the electrode tab 20. When the first driving member drives the first winding and unwinding roller 110 to rotate reverse, the first winding and unwinding roller 110 winds the electrode tab 20.

[0224] The second detection mechanism 920 is used to detect the overhang of the negative electrode tab wound on the winding mechanism 300 beyond the positive electrode tab along the extension 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 on the winding mechanism 300 by taking a picture, and obtains the overhang of the negative electrode tab beyond the positive electrode tab along the extension direction of the winding axis of the winding mechanism 300 by analyzing the image information.

[0225] The second detection mechanism 920 can be directly electrically connected with the first winding and unwinding mechanism 100, or indirectly electrically connected with the first winding and unwinding mechanism 100 through an intermediate component. For example, the winding device 10 comprises a controller, the second detection mechanism 920 is electrically connected with the controller, and the controller is electrically connected with the first winding and unwinding mechanism 100. When the second detection mechanism 920 detects that the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet is within the preset range, the controller controls the first winding and unwinding mechanism 100 to continue unwinding. When the second detection mechanism 920 detects that the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet exceeds the preset range, the controller controls the first winding and unwinding mechanism 100 to start winding.

[0226] The second detection mechanism 920 can be directly electrically connected with the second winding and unwinding mechanism 200, or indirectly electrically connected with the second winding and unwinding mechanism 200 through an intermediate component. For example, the winding device 10 comprises a controller, the second detection mechanism 920 is electrically connected with the controller, and the controller is electrically connected with the second winding and unwinding mechanism 200. When the second detection mechanism 920 detects that the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet is within the preset range, the controller controls the second winding and unwinding mechanism 200 to continue unwinding. When the second detection mechanism 920 detects that the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet exceeds the preset range, the controller controls the second winding and unwinding mechanism 200 to start winding.

[0227] By arranging the second detection mechanism 920, it is convenient to detect the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet wound on the winding mechanism 300. When the second detection mechanism 920 detects that the overhanging amount is lower than the threshold value, the first winding and unwinding mechanism 100 winds the electrode sheet 20, and the second winding and unwinding mechanism 200 winds the separator film 30, so that the electrode assembly wound on the winding mechanism 300 is unwound, and after the overhanging amount is manually or automatically corrected, the first winding and unwinding mechanism 100 unwinds the electrode sheet 20, the second winding and unwinding mechanism 200 unwinds the separator film 30, and rewinding is performed through the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing production cost.

[0228] Please refer to ​ In some embodiments, the winding device 10 further comprises a deviation rectifying mechanism 930, at least one deviation rectifying mechanism 930 is arranged corresponding to each first winding and unwinding mechanism 100, and the deviation rectifying mechanism 930 is responsive to the second detection mechanism 920. The deviation rectifying mechanism 930 is used for rectifying the negative electrode sheet or the positive electrode sheet.

[0229] The first winding and unwinding mechanism 100 for winding or unwinding the negative electrode sheet is correspondingly provided with at least one deviation rectifying mechanism 930, and the first winding and unwinding mechanism 100 for winding or unwinding the positive electrode sheet is correspondingly provided with at least one deviation rectifying mechanism 930.

[0230] The deviation rectifying mechanism 930 is a mechanism for rectifying the negative electrode sheet or the positive electrode sheet, and by rectifying the negative electrode sheet or the positive electrode sheet, the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet is adjusted.

[0231] The deviation rectifying mechanism 930 can rectify the positive electrode sheet or the negative electrode sheet to automatically repair the overhanging amount of the negative electrode sheet along the extension direction of the winding axis of the winding mechanism 300 beyond the positive electrode sheet. When the second detection mechanism 920 detects that the overhanging amount is lower than the threshold value, the first winding and unwinding mechanism 100 winds the electrode sheet 20, the second winding and unwinding mechanism 200 winds the isolation film 30, the electrode assembly wound by the winding mechanism 300 is unwound, and the deviation rectifying mechanism 930 rectifies the positive electrode sheet or the negative electrode sheet. After that, the first winding and unwinding mechanism 100 unwinds the electrode sheet 20, the second winding and unwinding mechanism 200 unwinds the isolation film 30, and the rewinding is performed by the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0232] According to some embodiments of the present application, please refer to ​ .

[0233] The embodiment of the application provides a winding device 10, which comprises a first winding and unwinding mechanism 100, a second winding and unwinding mechanism 200 and a winding mechanism 300. The first winding and unwinding mechanism 100 is used for winding or unwinding a pole piece 20, and the second winding and unwinding mechanism 200 is used for winding or unwinding an isolation film 30. The winding mechanism 300 is configured to wind the pole piece 20 and the isolation film 30 when the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 are unwound, and to unwind the pole piece 20 and the isolation film 30 when the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 are wound. In normal winding, the first winding and unwinding mechanism 100 unwinds the pole piece 20, the second winding and unwinding mechanism 200 unwinds the isolation film 30, and the pole piece 20 unwound by the first winding and unwinding mechanism 100 and the isolation film 30 unwound by the second winding and unwinding mechanism 200 are wound to form an electrode assembly by the winding mechanism 300. When it is found that the wound electrode assembly does not meet the design requirement, the first winding and unwinding mechanism 100 winds the pole piece 20, the second winding and unwinding mechanism 200 winds the isolation film 30, the electrode assembly wound by the winding mechanism 300 is unwound, manual or automatic correction is performed, then the first winding and unwinding mechanism 100 unwinds the pole piece 20, the second winding and unwinding mechanism 200 unwinds the isolation film 30, and rewinding is performed by the winding mechanism 300, so that the rewound electrode assembly meets the design requirement, and the entire electrode assembly does not have to be wasted, thereby reducing production cost.

[0234] The winding device 10 further comprises a first bidirectional flattening mechanism 400 located downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300. The first bidirectional flattening mechanism 400 is configured to flatten the pole piece 20 when the first winding and unwinding mechanism 100 winds or unwinds. When the first winding and unwinding mechanism 100 unwinds the pole piece 20, the first bidirectional flattening mechanism 400 can flatten the pole piece 20 unwound by the first winding and unwinding mechanism 100, so as to reduce the risk of wrinkling of the pole piece 20 and facilitate the winding mechanism 300 to wind the electrode assembly to meet the design requirement. When the first winding and unwinding mechanism 100 winds the pole piece 20, the electrode assembly wound by the winding mechanism 300 is unwound, and the first bidirectional flattening mechanism 400 can flatten the pole piece 20 unwound by the winding mechanism 300, so as to reduce the risk of wrinkling of the pole piece 20 and facilitate the pole piece 20 to be smoothly wound to the first winding and unwinding mechanism 100, thereby facilitating rewinding.

[0235] The first bidirectional flattening mechanism 400 comprises a passing roller 410 and a first flattening piece 420, and a first gap 430 is formed between the first flattening piece 420 and the passing roller 410, and the first gap 430 is used for the passage of the pole piece 20, and the first flattening piece 420 and the passing roller 410 are used to cooperate to flatten the pole piece 20. The first flattening piece 420 comprises a first flattening portion 421, a first guide portion 422 and a second guide portion 423, the first flattening portion 421 forms the first gap 430 with the outer circumferential surface of the passing roller 410; along the conveying direction of the pole piece 20, the first guide portion 422 and the second guide portion 423 are respectively connected to the two sides of the first flattening portion 421, the first guide portion 422 is configured to guide the pole piece 20 to the first gap 430 when the first unwinding and winding mechanism 100 unwinds, and the second guide portion 423 is configured to guide the pole piece 20 to the first gap 430 when the first unwinding and winding mechanism 100 winds. When the first unwinding and winding mechanism 100 unwinds the pole piece 20, the pole piece 20 can pass through the first gap 430 formed between the first flattening piece 420 and the passing roller 410 in the forward direction, and be flattened by the first flattening piece 420 and the passing roller 410, thereby reducing the risk of wrinkling of the pole piece 20. When the first unwinding and winding mechanism 100 winds the pole piece 20, the electrode assembly wound by the winding mechanism 300 is unwound, and the pole piece 20 can pass through the first gap 430 formed between the first flattening piece 420 and the passing roller 410 in the reverse direction, and be flattened by the first flattening piece 420 and the passing roller 410, thereby reducing the risk of wrinkling of the pole piece 20. The first guide portion 422 is configured to guide the pole piece 20 to the first gap 430 when the first unwinding and winding mechanism 100 unwinds, thereby realizing forward flattening of the pole piece 20. The second guide portion 423 is configured to guide the pole piece 20 to the first gap 430 when the first unwinding and winding mechanism 100 winds, thereby realizing reverse flattening of the pole piece 20, so that the pole piece 20 can be flattened whether the first unwinding and winding mechanism 100 winds or unwinds, thereby reducing the risk of wrinkling of the pole piece 20 and facilitating rewinding of the winding mechanism 300.

[0236] The winding device 10 comprises a first conveying mechanism 500, which is located downstream of the first unwinding and winding mechanism 100 and upstream of the winding mechanism 300, and is used to convey the pole piece 20 in the forward direction or the reverse direction. By arranging the first conveying mechanism 500, sufficient power is provided for conveying the pole piece 20 in the forward direction or the reverse direction, and the conveying speed of the pole piece 20 is accelerated, which is especially effective when the conveying path of the pole piece 20 is long. In addition, the first conveying mechanism 500 can form a tension break, so that the tension of the pole piece 20 is balanced during conveying, thereby reducing the risk of breakage of the pole piece 20 due to excessive tension.

[0237] The first conveying mechanism 500 comprises a first driven roller 520 and a first driving roller 510, and a second gap 511 is formed between the first driving roller 510 and the first driven roller 520, and the second gap 511 is used for the passage of the tab 20. The first driving roller 510 is configured to be able to rotate forward or reverse, so as to cooperate with the first driven roller 520 to forward or reverse convey the tab 20. The first conveying mechanism 500 further comprises a second bidirectional flattening mechanism arranged upstream and / or downstream of the first driving roller 510, and the second bidirectional flattening mechanism is configured to be able to flatten the tab 20 when the first driving roller 510 cooperates with the first driven roller 520 to forward or reverse convey the tab 20. The first driving roller 510 and the first driven roller 520 have the second gap 511 therebetween, and the tab 20 can pass through the second gap 511. When the first driving roller 510 rotates forward, the first driving roller 510 and the first driven roller 520 cooperate to forward convey the tab 20. When the first driving roller 510 rotates reversely, the first driving roller 510 and the first driven roller 520 cooperate to reverse convey the tab 20. By arranging the second bidirectional flattening mechanism upstream and / or downstream of the first driving roller 510, the tab 20 is flattened before passing through the second gap 511, so as to reduce the risk of the wrinkled tab entering the second gap 511, and thus the tab 20 is less likely to be damaged by the cooperation of the first driving roller 510 and the first driven roller 520.

[0238] The winding device 10 comprises a first buffering mechanism 700 arranged downstream of the first winding and unwinding mechanism 100 and upstream of the winding mechanism 300, and the first buffering mechanism 700 is used for buffering the tab 20. In the initial stage of starting the winding device 10, the first winding and unwinding mechanism 100 cannot be unwound too fast, otherwise the tab 20 is prone to be broken. By arranging the first buffering mechanism 700, in the initial stage of starting the winding device 10, the tab 20 buffered by the first buffering mechanism 700 can be quickly released, and the tab 20 is supplied to the winding mechanism 300, and the first winding and unwinding mechanism 100 is allowed to gradually speed up, so as to accelerate the production rhythm and reduce the production cost. In addition, when it is found that the wound electrode assembly does not meet the design requirements, the wound electrode assembly can be unwound and the tab 20 is buffered in the first buffering mechanism 700, instead of being all wound in the first winding and unwinding mechanism 100. When rewinding, the tab 20 buffered by the first buffering mechanism 700 can be released. In this way, the path of the forward conveying and reverse conveying of the tab 20 is shortened, which is conducive to reducing the rewinding time, accelerating the rewinding efficiency, and thus reducing the production cost.

[0239] The winding device 10 comprises a second buffering mechanism 800, which is located downstream of the second winding and unwinding mechanism 200 and upstream of the winding mechanism 300, and is used to buffer the isolation film 30. By arranging the second buffering mechanism 800, at the initial stage of starting the winding device 10, the isolation film 30 buffered in the second buffering mechanism 800 can be quickly released to supply the winding mechanism 300 with the isolation film 30, and the second winding and unwinding mechanism 200 can be slowly accelerated, so that 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 wound electrode assembly wound by the winding mechanism 300 can be unwound and the isolation film 30 can be buffered in the second buffering mechanism 800, instead of being all wound in the second winding and unwinding mechanism 200. During rewinding, the isolation film 30 buffered in the second buffering mechanism 800 can be released. In this way, the forward and reverse conveying paths of the isolation film 30 are shortened, which is beneficial to reduce the rewinding time, accelerate the rewinding efficiency, and thus reduce the production cost.

[0240] The winding device 10 comprises a first detection mechanism 910, which is used to detect the misalignment amount of the tab of the electrode piece 20 wound on the winding mechanism 300, and the first winding and unwinding mechanism 100 and the second winding and unwinding mechanism 200 are responsive to the first detection mechanism 910. The winding mechanism 300 comprises a winding needle and an adjusting assembly 310, the winding needle is used to wind the electrode piece 20 and the isolation film 30, and the adjusting assembly 310 is used to adjust the winding radius of the winding needle, and the adjusting assembly 310 is responsive to the first detection mechanism 910. The adjusting assembly 310 can adjust the winding radius of the winding needle, so as to automatically correct the misalignment amount of the tab. When the first detection mechanism 910 detects that the misalignment amount of the tab of the electrode piece 20 exceeds a threshold value, the first winding and unwinding mechanism 100 winds the electrode piece 20, the second winding and unwinding mechanism 200 winds the isolation film 30, the electrode assembly wound by the winding mechanism 300 is unwound, and the adjusting mechanism adjusts the winding radius of the winding needle according to the misalignment amount of the tab detected by the first detection mechanism 910, so as to automatically correct the misalignment amount of the tab. Then, the first winding and unwinding mechanism 100 unwinds the electrode piece 20, the second winding and unwinding mechanism 200 unwinds the isolation film 30, and rewinding is performed by the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0241] The winding device 10 comprises two first winding and unwinding mechanisms 100, one of which is used to wind or unwind the negative electrode sheet, and the other of which is used to wind or unwind the positive electrode sheet; the winding device 10 further comprises a second detection mechanism 920, which is used to detect the overhanging amount of the negative electrode sheet wound on the winding mechanism 300 beyond 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 is responsive to the second detection mechanism 920. The winding device 10 further comprises a correction mechanism 930, at least one correction mechanism 930 is arranged corresponding to each first winding and unwinding mechanism 100, the correction mechanism 930 is responsive to the second detection mechanism 920, and the correction mechanism 930 is used to correct the negative electrode sheet or the positive electrode sheet. The correction mechanism 930 can correct the positive electrode sheet or the negative electrode sheet to automatically repair the overhanging amount 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 overhanging amount is lower than a threshold value, the first winding and unwinding mechanism 100 winds the electrode sheet 20, the second winding and unwinding mechanism 200 winds the separator film 30, so that the electrode assembly wound by the winding mechanism 300 is unwound, and the correction mechanism 930 corrects the positive electrode sheet or the negative electrode sheet, and then the first winding and unwinding mechanism 100 unwinds the electrode sheet 20 and the second winding and unwinding mechanism 200 unwinds the separator film 30, so that the rewinding is performed by the winding mechanism 300, so that the rewound electrode assembly meets the design requirements, and the entire electrode assembly does not have to be wasted, thereby reducing the production cost.

[0242] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A winding device, characterized in that: include: A first rewinding and unwinding mechanism, used for rewinding or unwinding the pole piece; A 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The first guide portion and the second guide portion extend along arc tracks.

7. The winding device according to claim 4, characterized in that: 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 claim 2, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: The first conveying mechanism comprises: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 9, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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 with the first direction.

21. The winding device according to claim 1, characterized in that: 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; Wherein, the first conveying mechanism is provided both upstream and downstream of the first buffer mechanism.

22. The winding device according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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; Wherein, the fourth direction intersects with the third direction.

25. The winding device according to any one of claims 1 to 24, characterized in that: 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, characterized in that: 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 24, characterized in that: 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, characterized in that: 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.

Images