A winding method and a multi-station winding device with a pre-winding action

Abstract

The application provides a winding method with a pre-winding action and a multi-station winding device. The winding method with the pre-winding action comprises the following steps: a first conveying line conveys a first material belt to a material obtaining station; a winding mechanism located at a winding station performs a winding action, and the winding mechanism located at the material obtaining station moves to a pre-prepared position for butt joint with the first material belt; when the winding mechanism located at the winding station completes the winding action, the winding mechanism located at the material obtaining station obtains and cuts off the first material belt; when each winding mechanism on a winding line completes the action of the station, the winding mechanism moves to a downstream station; wherein the winding mechanism performs the pre-winding action when moving from the material obtaining station to the winding station. The pre-winding action is parallel to the movement of the winding mechanism from the material obtaining station to the winding station, so that the preliminary winding of the battery cell can be started during the station changing process. The winding method with the pre-winding action can shorten the time consumption of the battery cell manufacturing process.

Description

Technical Field

[0001] This invention relates to the field of battery cell manufacturing, and in particular to a winding method with pre-winding action and a multi-station winding device. Background Technology

[0002] Battery cell manufacturing can employ a winding process. A winding machine typically includes multiple stations, each responsible for different actions. In current winding methods, after completing the action at the current station, the winding machine controls the winding mechanism to move to the next station. Upon reaching the next station, the winding mechanism performs the next part of the action. Finally, the winding mechanism unloads the battery cell at the unloading station, then transfers it to the initial station to re-acquire the material strip, starting a new cycle.

[0003] The problem with current winding methods is that the entire winding process requires a certain amount of time to switch between different workstations of the winding mechanism, resulting in poor continuity of the winding process and difficulty in shortening the time required. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a winding method with pre-winding action and a multi-station winding device. The winding method with pre-winding action can shorten the time consumed in the battery cell manufacturing process.

[0005] According to the winding method with pre-winding action provided by the present invention, the winding method with pre-winding action uses a winding line, a first conveyor line and at least three winding mechanisms that move along the winding line, the winding line being connected end to end, the winding line including a material receiving station and a winding station, the winding station being located downstream of the material receiving station.

[0006] Winding methods with pre-winding action include:

[0007] The first conveyor line delivers the first material belt to the material receiving station;

[0008] The winding mechanism located at the winding station performs a winding action, and the winding mechanism located at the material receiving station moves to a preparatory position that is compatible with the first material strip.

[0009] When the winding mechanism at the winding station completes the winding action, the winding mechanism at the material receiving station acquires and cuts the first strip.

[0010] After the winding mechanism at each station completes its operation at that station, the winding mechanism moves to the downstream station.

[0011] The winding mechanism performs a pre-winding action when it moves from the material receiving station to the winding station.

[0012] The winding method with pre-winding action provided by the present invention has at least the following technical effects: by adding a pre-winding action, the winding mechanism performs a pre-winding action after acquiring the first material strip. The pre-winding action is parallel to the movement of the winding mechanism from the material acquisition station to the winding station, so that the initial winding of the battery cell can begin during the station change process, which shortens the time spent by the winding mechanism in winding the battery cell at the winding station. The winding method with pre-winding action can shorten the time spent in the battery cell manufacturing process.

[0013] According to some embodiments of the present invention, the winding line further includes an adhesive application station and a material unloading station. The winding mechanism located at the material receiving station can sequentially pass through the winding station, the adhesive application station, and the material unloading station to return to the material receiving station. The winding method with pre-winding action further includes:

[0014] The winding mechanism performs a finishing action when it moves from the winding station to the adhesive application station;

[0015] When the winding mechanism moves to the adhesive application station, it performs the adhesive application action.

[0016] The winding mechanism performs the unloading action when it moves to the unloading station.

[0017] According to some embodiments of the present invention, the winding line further includes a feeding station, and the winding mechanism located at the receiving station can sequentially pass through the winding station and the feeding station to return to the receiving station. The winding method with pre-winding action further includes:

[0018] After completing the winding action, the winding mechanism performs the finishing action and the adhesive application action.

[0019] The winding mechanism performs the unloading action when it moves to the unloading station.

[0020] According to some embodiments of the present invention, the winding mechanism includes a winding needle, the winding needle including a first needle body and a second needle body, and the step of moving the winding mechanism to a preparatory position for docking with the first strip includes:

[0021] The coiled needle extends axially to allow the first strip of material to pass between the first needle body and the second needle body;

[0022] Winding methods with pre-winding action also include:

[0023] As the winding mechanism moves from the upstream station to the material receiving station, the winding needle retracts axially to avoid the first material strip.

[0024] According to some embodiments of the present invention, the winding mechanism further includes a rotary cutter located between the first needle body and the second needle body, the rotary cutter including a cutting edge and a clamping part, and the step of the winding mechanism acquiring and cutting the first strip includes:

[0025] The rotary cutter rotates to bring the clamping part closer to the second needle body, and the clamping part and the second needle body clamp the first material strip;

[0026] The rotary cutter rotates to bring the blade closer to the first needle body, and the first needle body and the blade cut the first strip.

[0027] According to some embodiments of the present invention, the winding method with pre-winding action uses a second conveyor line, and the winding method with pre-winding action further includes:

[0028] The second conveyor line conveys the second strip to the winding station, and the winding mechanism located at the winding station obtains the second strip.

[0029] Obtain a first offset, which refers to the offset of the second strip relative to the winding mechanism;

[0030] The winding mechanism is controlled to move in order to counteract the first offset.

[0031] The winding method with pre-winding action provided by the present invention also has the following technical effects: after the winding mechanism at the material receiving station obtains the first material strip, it performs a pre-winding action during the process of moving to the winding station. During the process of reaching the winding station, it can also start a correction action according to the offset of the second material strip to adapt to the position of the second material strip. The pre-winding action, the correction action and the movement of the winding mechanism from the material receiving station to the winding station are parallel, which shortens the time consumed in the cell manufacturing process.

[0032] According to some embodiments of the present invention, the first conveyor line includes two diaphragm conveying units and a first electrode conveying unit, and the step of the first conveyor line conveying the first material belt to the receiving station further includes:

[0033] The diaphragm delivery unit provides a diaphragm, and the first electrode delivery unit provides the first electrode.

[0034] Obtain a second offset, which refers to the offset of the diaphragm relative to the first electrode;

[0035] Control the movement of the diaphragm to counteract the second offset;

[0036] The two diaphragms are respectively attached to both sides of the first electrode to form the first material strip;

[0037] The first material strip is sent to the material receiving station.

[0038] According to some embodiments of the present invention, the step of sending the first material strip to the material receiving station includes:

[0039] Cut the first material strip;

[0040] Apply protective adhesive to the cut location to reconnect the first strip;

[0041] The pasted first material strip is sent to the material receiving station;

[0042] Specifically, when applying the protective adhesive, a gap is left between the two sections of the first strip, and the position of the cut in the step of the winding mechanism acquiring and cutting the first strip is consistent with the position of the gap.

[0043] The multi-station winding device provided by the present invention includes a winding line, a first conveyor line, and at least three winding mechanisms. The winding line is connected end to end and includes a material receiving station and a winding station. The winding station is located downstream of the material receiving station. The first conveyor line is used to convey a first material strip to the material receiving station. The winding mechanisms are movable along the winding line.

[0044] The multi-station winding device provided by the present invention has at least the following technical effects: the multi-station winding device can use the winding method with pre-winding action provided by the present invention, so the initial winding of the battery cell can begin during the station change process, which shortens the time spent by the winding mechanism in the winding station to wind the battery cell, and the multi-station winding device can shorten the time spent in the battery cell manufacturing process.

[0045] According to some embodiments of the present invention, the winding line further includes an adhesive application station and a material unloading station. The winding mechanism can sequentially pass through the material receiving station, the winding station, the adhesive application station, and the material unloading station to return to the material receiving station. A finishing mechanism for finishing is installed between the winding station and the adhesive application station, and an adhesive application mechanism for applying adhesive is installed at the adhesive application station.

[0046] According to some embodiments of the present invention, the winding line further includes a material unloading station, and the winding mechanism is able to return to the material receiving station in sequence through the material receiving station, the winding station and the material unloading station, and the winding station is equipped with a finishing and adhesive application mechanism for finishing and applying adhesive.

[0047] According to some embodiments of the present invention, the first conveying line includes two diaphragm conveying units and a first electrode conveying unit, wherein the diaphragm conveying units are used to provide diaphragms, the first electrode conveying unit is used to provide first electrodes, and the first conveying line is capable of attaching the two diaphragms to both sides of the first electrode to form the first strip.

[0048] According to some embodiments of the present invention, the first conveyor line includes a pre-cutting station for cutting the first strip and for forming a gap at the cut position of the first strip and applying protective adhesive.

[0049] According to some embodiments of the present invention, the winding mechanism includes a winding needle and a rotary cutter. The winding needle includes a first needle body and a second needle body, which are used to clamp the first strip. The rotary cutter is located between the first needle body and the second needle body. The rotary cutter includes a cutting edge and a clamping part. The cutting edge is adapted to the first needle body, and the clamping part is adapted to the second needle body. The rotary cutter is rotatable so that the cutting edge cuts the first strip, and the rotary cutter is rotatable so that the clamping part clamps the first strip.

[0050] According to some embodiments of the present invention, the multi-station winding device further includes a second conveyor line for conveying a second strip to the winding station, and the winding mechanism is capable of extending and retracting along the axial direction to correct the deviation of the second strip. Attached Figure Description

[0051] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0052] Figure 1 This is a schematic diagram of one embodiment of the multi-station winding device of the present invention;

[0053] Figure 2 This is a schematic diagram of another embodiment of the multi-station winding device of the present invention;

[0054] Figure 3 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0055] Figure 4 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0056] Figure 5 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0057] Figure 6 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0058] Figure 7 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0059] Figure 8 This is a schematic diagram of the winding mechanism of the present invention performing a winding method with a pre-winding action;

[0060] Figure 9 This is a flowchart of the operation of the winding mechanism of the present invention;

[0061] Figure 10 This is a schematic diagram of the rotating cutter of the present invention.

[0062] Figure label:

[0063] Winding mechanism 110, first needle body 111, second needle body 112, blade 113, clamping part 114, finishing mechanism 120, adhesive application mechanism 130, finishing adhesive application mechanism 140.

[0064] First feed strip 210, diaphragm 211, first electrode 212, second feed strip 220

[0065] Material receiving station 310, winding station 320, adhesive application station 330, unloading station 340, bonding station 360, and pre-cutting station 370. Detailed Implementation

[0066] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0067] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or work position relationship, are based on the orientation or work position relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0068] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The terms "first," "second," "third," and "fourth," etc., are used to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features or the order of the indicated technical features. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0069] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0070] According to the winding method with pre-winding action provided by the present invention, the winding method with pre-winding action uses a winding line, a first conveyor line and at least three winding mechanisms 110 that move along the winding line. The winding line is connected end to end and includes a material receiving station 310 and a winding station 320. The winding station 320 is located downstream of the material receiving station 310.

[0071] Winding methods with pre-winding action include:

[0072] The first conveyor line conveys the first material belt 210 to the material receiving station 310;

[0073] The winding mechanism 110 located at the winding station 320 performs a winding action, and the winding mechanism 110 located at the material receiving station 310 moves to a preparatory position that is compatible with the first material strip 210.

[0074] When each winding mechanism 110 on the winding line completes the winding action, the winding mechanism 110 located at the material receiving station 310 obtains and cuts the first material strip 210.

[0075] After the winding mechanism 110 at each station completes its operation at that station, the winding mechanism 110 moves to the downstream station.

[0076] The winding mechanism 110 performs a pre-winding action when it moves from the material receiving station 310 to the winding station 320.

[0077] In the current winding method, the different actions are connected in series. When the winding mechanism 110 switches between different workstations, the winding mechanism 110 does not perform any other actions except for moving.

[0078] The pre-winding action refers to the rotation of the winding mechanism 110 causing the first material strip 210 to be pre-wound onto the winding mechanism 110. According to the winding method with pre-winding action provided by the present invention, by adding the pre-winding action, the pre-winding action is parallel to the movement of the winding mechanism 110 from the material receiving station 310 to the winding station 320, so that the initial winding of the battery cell can begin during the station change process, shortening the time spent by the winding mechanism to wind the battery cell at the winding station. The winding method with pre-winding action can shorten the time spent in the battery cell manufacturing process.

[0079] Understandably, the current winding mechanism 110 moves the first strip 210 to the winding station 320 for winding. When the current winding mechanism 110 completes the winding action, the next winding mechanism 110 will cut the first strip 210 at the material receiving station 310, thus realizing the connection and cycle between different winding mechanisms 110. When the winding mechanism 110 at the material receiving station 310 cuts the first strip 210, the winding mechanism 110 at the winding station 320 pauses winding and immediately resumes winding after the cutting is completed.

[0080] The battery cell manufacturing process also includes finishing, adhesive application, and unloading actions. The finishing action involves pressing down the end of the battery cell to prevent it from unwinding while the winding mechanism 110 continues to rotate to wind up the end. The adhesive application action involves applying finishing adhesive to the end of the finished battery cell to prevent it from unwinding. The unloading action involves removing the battery cell from the winding mechanism 110. The finishing action should precede the action of the next winding mechanism 110 cutting the first strip 210. Depending on the specific design, the winding, finishing, adhesive application, and unloading actions can be performed at the same station or at different stations.

[0081] In some embodiments, the winding line further includes an adhesive application station 330 and a material unloading station 340. The winding mechanism 110 located at the material receiving station 310 can sequentially pass through the winding station 320, the adhesive application station 330, and the material unloading station 340 back to the material receiving station 310. The winding method with pre-winding action further includes:

[0082] The winding mechanism 110 performs a finishing action when it moves from the winding station 320 to the adhesive application station 330.

[0083] When the winding mechanism 110 moves to the adhesive application station 330, it performs the adhesive application action.

[0084] When the winding mechanism 110 moves to the unloading station 340, it performs the unloading action.

[0085] By making the finishing action parallel to the movement of the winding mechanism 110 from the winding station 320 to the adhesive application station 330, the winding method with pre-winding action can further shorten the time required for the cell manufacturing process.

[0086] In some other embodiments, the winding line further includes a feeding station 340, and the winding mechanism 110 located at the receiving station 310 can sequentially pass through the winding station 320 and the feeding station 340 to return to the receiving station 310. The winding method with pre-winding action further includes:

[0087] After the winding mechanism 110 completes the winding action, it performs the finishing action and the adhesive application action.

[0088] When the winding mechanism 110 moves to the unloading station 340, it performs the unloading action.

[0089] By integrating the winding, finishing, and adhesive application actions into the winding station, the time required for the winding mechanism 110 to move from the winding station 320 to the adhesive application station 330 can be eliminated, thereby further shortening the time required for the battery cell manufacturing process.

[0090] According to some embodiments of the present invention, the winding mechanism 110 includes a winding needle, the winding needle including a first needle body 111 and a second needle body 112, and the step of moving the winding mechanism 110 to a preparatory position for docking with the first strip 210 includes:

[0091] The coiled needle extends toward the first material strip 210 so that the first material strip 210 passes between the first needle body 111 and the second needle body 112;

[0092] Winding methods with pre-winding action also include:

[0093] When the winding mechanism 110 moves from the upstream station to the material receiving station 310, the winding needle retracts in a direction away from the first material strip 210 to avoid the first material strip 210.

[0094] The movement away from the first material strip 210, that is, the avoidance movement of the first material strip 210, can take many forms, such as the first needle body 111 and the second needle body 112 turning outward, the first needle body 111 and the second needle body 112 folding, the first needle body 111 and the second needle body 112 retracting along the axis of the coiled needle, etc.

[0095] By avoiding interference with the winding mechanism 110's winding of the first material strip 210 at the previous winding mechanism 110 located at the winding station 320 when the winding mechanism 110 moves towards the material receiving station 310, the movement of the winding mechanism 110 towards the material receiving station 310 can be carried out in parallel with the winding process of the previous winding mechanism 110 winding the first material strip 210, thereby further shortening the battery cell manufacturing time. Similarly, the process of the winding mechanism 110 moving to the preparatory position adapted to the first material strip 210 can also be carried out in parallel with the winding process of the previous winding mechanism 110 winding the first material strip 210, thereby further shortening the battery cell manufacturing time.

[0096] In some embodiments, the winding mechanism 110 further includes a rotary cutter located between the first needle body 111 and the second needle body 112. The rotary cutter includes a cutting edge 113 and a clamping part 114. The step of the winding mechanism 110 acquiring and cutting the first strip 210 includes:

[0097] The rotating cutter rotates to bring the clamping part 114 close to the second needle body 112, and the clamping part 114 and the second needle body 112 clamp the first material strip 210;

[0098] The rotating cutter rotates to bring the blade 113 close to the first needle body 111, and the first needle body 111 and the blade 113 cut the first strip 210.

[0099] Reference Figure 10 The first needle body 111 includes a fixed cutting blade, and the second needle body 112 includes a clamping block. First, the clamping part 114 and the clamping block clamp the first material strip 210, limiting its position and preventing movement during cutting. Then, the cutting blade 113 and the fixed cutting blade work together to cut the first material strip 210. By placing the rotating cutter inside the needle winding mechanism, the volume of the winding mechanism 110 is effectively reduced, contributing to a more compact winding layout. Simultaneously, the rotating cutter has a cavity in the middle, which can serve as a flow channel for blowing or sucking dust, thereby increasing the cross-sectional area of ​​the flow channel and improving dust removal efficiency compared to traditional straight-line cutters. The clamping part 114 and / or the clamping block are elastic, avoiding rigid contact and reducing damage to the first material strip 210 during clamping. Furthermore, as the rotating cutter rotates, the clamping part 114 and / or the clamping block deform, preventing obstruction of the movement of the cutting blade 113.

[0100] According to some embodiments of the present invention, the winding method with pre-winding action uses a second conveyor line, and the winding method with pre-winding action further includes:

[0101] The second conveyor line conveys the second material belt 220 to the winding station 320;

[0102] The first strip 210 includes a first electrode 212, and the second strip 220 includes a second electrode.

[0103] When winding, refer to Figure 1 and Figure 2 The second strip 220 is fed in from the cutting point where the first strip 210 is wound. As the winding proceeds, the first strip 210 clamps the second strip 220, thereby obtaining the second strip 220.

[0104] The battery cell includes a cathode sheet, an anode sheet, and a separator separating the cathode and anode sheets. In existing winding methods, the cathode sheet, anode sheet, and two separators need to be joined together before being sent to the winding mechanism 110. After being cut, the cathode and anode sheets are fed into the joining position by their respective feeding mechanisms. The feeding mechanisms correct the offset based on the deviation when feeding the cathode sheet and the anode sheet. Because the conveying route of the cathode and anode sheets is relatively long during feeding, and the feeding mechanisms are far from the joining and winding positions, the correction suffers from lag and inadequate response. Furthermore, the correction of the two feeding mechanisms may interfere with each other. Therefore, the existing winding method has the problem of poor alignment of the edges of the cathode sheet, anode sheet, and separators, resulting in defective battery cells after winding.

[0105] In the winding method with pre-winding action of the present invention, the first material strip 210 is first sent to the winding mechanism 110, and then the second material strip 220 is sent to the winding mechanism 110. When the second material strip 220 is sent in, since the first material strip 210 is already in a wound state, its stability and controllability are good. The first material strip 210 can be controlled to perform the correction action according to the offset of the second material strip 220. Therefore, the offset when the second material strip 220 is sent in is easy to adjust and correct, which makes it easy to improve the quality of cell winding.

[0106] It is understandable that at this time, the first material strip 210 includes the first electrode 212, and the second material strip 220 includes the second electrode. One of the first electrode 212 and the second electrode is an anode and the other is a cathode.

[0107] The correction can be achieved through the movement of the winding mechanism 110.

[0108] In some embodiments, the winding method with a pre-winding action further includes:

[0109] Obtain the first offset, which refers to the offset of the second strip 220 relative to the winding mechanism 110;

[0110] The winding mechanism 110 is controlled to move to counteract the first offset.

[0111] Specifically, the first offset can be obtained using components such as CCD or sensors. Since the winding mechanism 110 directly corrects the deviation at this time, the correction position coincides with the winding position. The winding mechanism 110 clamps the first material strip 210 and corrects the deviation according to the second material strip 220, so that the first material strip 210 is adapted to the incoming position of the second material strip 220, thereby ensuring the alignment of the two side edges of the second material strip 220 and the first material strip 210. Therefore, it can solve the problems of correction lag and inadequate correction response, and improve the quality of the battery cell.

[0112] Simultaneously, after the winding mechanism 110 clamps the first strip 210, the winding mechanism 110 can begin the correction action to prepare for obtaining the second strip 220. That is, the correction action and the pre-winding action of the winding mechanism 110 can be performed in parallel.

[0113] According to some embodiments of the present invention, the first conveyor line includes two diaphragm conveying units and a first electrode conveying unit, and the step of the first conveyor line conveying the first material belt 210 to the receiving station 310 further includes:

[0114] The diaphragm conveying unit provides a diaphragm 211, and the first electrode conveying unit provides a first electrode 212;

[0115] Obtain the second offset, which refers to the offset of the diaphragm 211 relative to the first electrode 212;

[0116] Control the movement of diaphragm 211 to counteract the second offset;

[0117] Two diaphragms 211 are respectively attached to both sides of the first electrode 212 to form the first material strip 210;

[0118] The first conveyor belt 210 is sent to the material receiving station 310.

[0119] Understandably, in some current solutions, an electrode sheet is bonded to a separator 211. The resulting strip is relatively thin and has weak resistance to deformation. In other solutions, the electrode sheet needs to be cut by a feeding mechanism before being fed between the separators. After cutting, the electrode sheet is also thin and has weak resistance to deformation. This can easily lead to misalignment of the electrode head and tail, resulting in poor alignment between the electrode sheet and the separator. Furthermore, uneven stress and wrinkling can easily occur at the edges of the electrode sheet during transport, affecting the quality of the cell winding.

[0120] Some embodiments of the present invention improve the thickness and deformation resistance of the first strip 210 by bonding the two diaphragms 211 to the first electrode 212, making it less prone to wrinkling during transport. The pre-winding action of the winding method can improve the continuity of the cell winding process, thereby helping to improve the efficiency of the winding process. Since the second strip 220 is fed in during winding, the transport distance is shorter, and the risk of wrinkling during transport is lower.

[0121] The beneficial effects of this invention also lie in the fact that it eliminates the film-forming step in the prior art, so that the diaphragm 211 does not participate in film-forming and shortens the length of the diaphragm 211 at both ends; at the same time, it also eliminates a set of feeding mechanisms in the existing winding equipment. The first material strip 210 is fed through the acquisition and traction of the winding mechanism 110, ensuring the positional accuracy of the first material strip 210; by using the pre-bonded first material strip 210 and the second material strip 220 for winding, the problem that the first electrode 212, which is not bonded, is prone to offset at the head and tail after feeding and cutting in the prior art, resulting in poor alignment between the first electrode 212 and the diaphragm 211, can be eliminated, thus improving the alignment between the first electrode 212 and the diaphragm 211.

[0122] In some embodiments, the step of feeding the first conveyor belt 210 to the receiving station 310 includes:

[0123] Cut the first material strip 210;

[0124] Apply protective adhesive to the cut location to reconnect the first strip 210;

[0125] Send the pasted first material strip 210 to the material receiving station;

[0126] In the process of applying protective adhesive, a gap is left between the two sections of the first strip 210. In the step of the winding mechanism 110 acquiring and cutting the first strip 210, the cutting position is consistent with the position of the gap.

[0127] In some current winding methods, to prevent the chips and burrs generated when the winding mechanism 110 cuts the first strip 210 from piercing the diaphragm 211 or the first electrode 212, and to prevent the chips from contaminating the winding mechanism 110, protective adhesive is applied to the cutting position before cutting. The resulting chips and burrs are then held in place by the adhesive and will not pierce the diaphragm 211 or the first electrode 212 during subsequent winding. However, this method still generates chips and burrs, and therefore still poses certain risks.

[0128] In some embodiments of the present invention, a pre-cutting step is added during the conveying of the first material strip 210 to pre-cut the first material strip 210. When the winding mechanism 110 cuts, it only needs to cut the protective adhesive from the gap position. Therefore, the winding mechanism 110 will not cut into the diaphragm 211 or the first electrode 212 during the second cut, thus avoiding the generation of chips in the diaphragm 211 or the first electrode 212 during the second cut. In addition, the pre-cutting step cuts first and then applies the protective adhesive, so the chips generated during the cut will remain on the first conveying line, and the burrs generated will be stuck by the protective adhesive, which will not easily affect the subsequent winding.

[0129] In some embodiments, when the second conveyor line conveys the second material belt 220, protective adhesive may be applied to the second material belt 220, and then the second material belt 220 may be cut after application.

[0130] The multi-station winding device provided by the present invention includes a winding line, a first conveyor line, and at least three winding mechanisms 110 that move along the winding line. The winding line is connected end to end and includes a material receiving station 310 and a winding station 320. The winding station 320 is located downstream of the material receiving station 310. The first conveyor line is used to convey a first material strip 210 to the material receiving station 310. The winding mechanisms 110 are capable of moving along the winding line.

[0131] The multi-station winding device provided by the present invention can be used to perform the winding method with pre-winding action provided by the present invention. Therefore, the initial winding of the battery cell can begin during the station change process, which shortens the time spent by the winding mechanism 110 in winding station 320 for winding the battery cell. The multi-station winding device can shorten the time spent in the battery cell manufacturing process.

[0132] In some embodiments, the winding line further includes an adhesive application station 330 and a material unloading station 340. The winding mechanism 110 can sequentially pass through the material receiving station 310, the winding station 320, the adhesive application station 330, and the material unloading station 340 back to the material receiving station 310. A finishing mechanism 120 for finishing is installed between the winding station 320 and the adhesive application station 330. An adhesive application mechanism 130 for applying adhesive is installed at the adhesive application station 330.

[0133] In some embodiments, the winding line further includes a material unloading station 340, and the winding mechanism 110 can return to the material receiving station 310 by passing through the material receiving station 310, the winding station 320 and the material unloading station 340 in sequence. The winding station 320 is equipped with a finishing and adhesive application mechanism 140 for finishing and applying adhesive.

[0134] In some embodiments, the first conveying line includes two diaphragm conveying units and a first electrode conveying unit. The diaphragm conveying units are used to provide diaphragms 211, and the first electrode conveying unit is used to provide a first electrode 212. The first conveying line is capable of attaching the two diaphragms 211 to both sides of the first electrode 212 to form a first strip 210.

[0135] In some embodiments, the first conveyor line includes a pre-cutting station 370, which is used to cut the first material strip 210 and to form a gap at the cut position of the first material strip 210 and apply protective adhesive.

[0136] In some embodiments, the winding mechanism 110 includes a winding needle and a rotary cutter. The winding needle includes a first needle body 111 and a second needle body 112, which are used to clamp the first strip 210. The rotary cutter is located between the first needle body 111 and the second needle body 112. The rotary cutter includes a cutting edge 113 and a clamping part 114. The cutting edge 113 is adapted to the first needle body 111, and the clamping part 114 is adapted to the second needle body 112. The rotary cutter can rotate to cut the first strip 210 with the cutting edge 113 and to clamp the first strip 210 with the clamping part 114.

[0137] In some embodiments, the multi-station winding device further includes a second conveyor line for conveying a second strip 220 to the winding station 320, and the winding mechanism 110 is capable of extending and retracting along the axial direction to correct the deviation of the second strip 220.

[0138] The multi-station winding apparatus also includes functional modules and beneficial effects corresponding to the winding method with pre-winding action provided in any embodiment of the present invention. Technical details not described in detail in the above embodiments can be found in the winding method with pre-winding action provided in any embodiment of this application.

[0139] The following is for reference. Figures 1 to 10 The winding method and multi-station winding apparatus with pre-winding action according to the present invention are described in detail with two specific embodiments. It should be explained that, in Figures 3 to 8 In the diagram, the dashed lines representing the winding mechanism 110 and the solid lines representing the winding mechanism 110 indicate that they are located on different planes, thereby achieving spatial offset between the winding mechanism 110 and the first strip 210. It is important to understand that the following description is merely illustrative and not a specific limitation of the invention.

[0140] Example 1:

[0141] Reference Figure 1 as well as Figure 10 The multi-station winding device includes a turret, a first conveyor line, a second conveyor line, and four winding mechanisms 110.

[0142] A circular winding line is formed on the turret. The winding line includes a material receiving station 310, a winding station 320, an adhesive application station 330, and a material unloading station 340 arranged in sequence. A finishing mechanism 120 is installed between the winding station 320 and the adhesive application station 330. An adhesive application mechanism 130 is installed at the adhesive application station 330, and a material unloading mechanism is installed at the material unloading station 340.

[0143] The first conveyor line includes a first material preparation station, a bonding station 360, and a pre-cutting station 370 arranged sequentially. The first material preparation station includes two diaphragm conveying units and one first electrode conveying unit. The second conveyor line includes a second material preparation station and a cutting station arranged sequentially. The second material preparation station includes a second electrode conveying unit.

[0144] The turret is rotatable to allow the winding mechanism 110 to move cyclically along the winding line. The winding mechanism 110 includes a winding needle and a rotary cutter. The winding mechanism 110 is rotatable along its own axis and can extend or retract. The winding needle includes a first needle body 111 and a second needle body 112, which are used to clamp the first material strip 210. The rotary cutter is located between the first needle body 111 and the second needle body 112. The rotary cutter includes a cutting edge 113 and a clamping part 114. The cutting edge 113 is adapted to the first needle body 111, and the clamping part 114 is adapted to the second needle body 112.

[0145] Reference Figures 3 to 9 The multi-station winding device is used according to the following winding method with pre-winding action:

[0146] The first conveyor line conveys the first material belt 210 to the material receiving station 310, and the second conveyor line conveys the second material belt 220 to the winding station 320.

[0147] The winding mechanism 110 located at the winding station 320 performs a winding operation;

[0148] The winding mechanism 110 located at the material receiving station 310 moves to a preparatory position to dock with the first material strip 210;

[0149] When the winding mechanism 110 moves to the adhesive application station 330, it performs the adhesive application action.

[0150] When the winding mechanism 110 moves to the unloading station 340, it performs the unloading action;

[0151] When the winding mechanism 110 at the winding station 320 completes the winding action, the winding mechanism 110 at the material receiving station 310 acquires and cuts the first strip 210.

[0152] After each winding mechanism 110 on the winding line completes the action of the current station, the winding mechanism 110 located at the material receiving station 310 moves to the winding station 320, the winding mechanism 110 located at the winding station 320 moves to the adhesive application station 330, the winding mechanism 110 located at the adhesive application station 330 moves to the unloading station 340, and the winding mechanism 110 located at the unloading station 340 moves to the material receiving station 310.

[0153] When the winding mechanism 110 moves from the material receiving station 310 to the winding station 320, it performs a pre-winding action;

[0154] The winding mechanism 110 performs a finishing action when it moves from the winding station 320 to the adhesive application station 330.

[0155] When the winding mechanism 110 moves from the unloading station 340 to the receiving station 310, the winding needle retracts axially to avoid the first material strip 210, obtains the first offset, and controls the movement of the winding mechanism 110 to counteract the first offset.

[0156] The first offset refers to the offset of the second strip 220 relative to the winding mechanism 110.

[0157] The step of moving the winding mechanism 110 to the preparatory position for docking with the first strip 210 includes:

[0158] The coiled needle extends axially so that the first strip 210 is placed between the first needle body 111 and the second needle body 112.

[0159] The step of the winding mechanism 110 acquiring and cutting the first strip 210 includes:

[0160] The rotating cutter rotates to bring the clamping part 114 close to the second needle body 112, and the clamping part 114 and the second needle body 112 clamp the first material strip 210;

[0161] The rotating cutter rotates to bring the blade 113 close to the first needle body 111, and the first needle body 111 and the blade 113 cut the first strip 210.

[0162] The step of conveying the first conveyor belt 210 to the receiving station 310 also includes:

[0163] The diaphragm conveying unit provides a diaphragm 211, and the first electrode conveying unit provides a first electrode 212;

[0164] Get the second offset;

[0165] Control the movement of diaphragm 211 to counteract the second offset;

[0166] The second offset refers to the offset of the diaphragm 211 relative to the first electrode 212.

[0167] Two diaphragms 211 are respectively attached to both sides of the first electrode 212 to form the first material strip 210;

[0168] Cut the first material strip 210;

[0169] Apply protective adhesive to the cut location to reconnect the first strip 210;

[0170] Send the pasted first material strip 210 to the material receiving station;

[0171] In the process of applying protective adhesive, a gap is left between the two sections of the first strip 210. In the step of the winding mechanism 110 acquiring and cutting the first strip 210, the cutting position is consistent with the position of the gap.

[0172] Example 2:

[0173] Reference Figure 2 The difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 integrates the winding, finishing, and adhesive application actions into the winding station 320. The winding line also includes a material unloading station 340. The winding mechanism 110 can sequentially pass through the material receiving station 310, the winding station 320, and the material unloading station 340 back to the material receiving station 310. The winding station 320 is equipped with a finishing and adhesive application mechanism 140 for finishing and applying adhesive. In addition, Embodiment 2 replaces the rotating cutter of the winding mechanism 110 with an external cutter. When the winding mechanism 110 extends and retracts, the external cutter and the winding needle extend and retract separately. After the external cutter completes the cutting of the first strip 210, it can retract first.

[0174] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0175] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A winding method with a pre-winding action, characterized in that: A winding method with a pre-winding action uses a winding line, a first conveyor line, and at least three winding mechanisms that move along the winding line, the winding line being connected end to end, the winding line including a material receiving station and a winding station, the winding station being located downstream of the material receiving station; Winding methods with pre-winding action include: The first conveyor line delivers the first material belt to the material receiving station; The winding mechanism located at the winding station performs a winding action, and the winding mechanism located at the material receiving station moves to a preparatory position that is compatible with the first material strip. When the winding mechanism at the winding station completes the winding action, the winding mechanism at the material receiving station acquires and cuts the first strip. After each winding mechanism on the winding line completes its operation at its respective station, the winding mechanism moves to the downstream station. The winding mechanism performs a pre-winding action when it moves from the material receiving station to the winding station; The winding method with pre-winding action uses a second conveyor line, and the winding method with pre-winding action also includes: The second conveyor line conveys the second strip to the winding station, and the winding mechanism located at the winding station obtains the second strip. Obtain a first offset, which refers to the offset of the second strip relative to the winding mechanism; The winding mechanism is controlled to move in order to counteract the first offset.

2. The winding method with pre-winding action according to claim 1, characterized in that, The winding line further includes an adhesive application station and a material unloading station. The winding mechanism located at the material receiving station can sequentially pass through the winding station, the adhesive application station, and the material unloading station to return to the material receiving station. The winding method with pre-winding action further includes: The winding mechanism performs a finishing action when it moves from the winding station to the adhesive application station; When the winding mechanism moves to the adhesive application station, it performs the adhesive application action. The winding mechanism performs the unloading action when it moves to the unloading station.

3. The winding method with pre-winding action according to claim 1, characterized in that: The winding line also includes a feeding station, and the winding mechanism located at the feeding station can sequentially pass through the winding station and the feeding station to return to the feeding station. The winding method with pre-winding action further includes: After completing the winding action, the winding mechanism performs the finishing action and the adhesive application action. The winding mechanism performs the unloading action when it moves to the unloading station.

4. The winding method with pre-winding action according to claim 1, characterized in that, The winding mechanism includes a winding needle, which includes a first needle body and a second needle body. The step of moving the winding mechanism to a preparatory position to engage with the first material strip includes: The coiled needle extends axially to allow the first strip of material to pass between the first needle body and the second needle body; Winding methods with pre-winding action also include: As the winding mechanism moves from the upstream station to the material receiving station, the winding needle retracts axially to avoid the first material strip.

5. The winding method with pre-winding action according to claim 4, characterized in that, The winding mechanism further includes a rotary cutter located between the first needle body and the second needle body. The rotary cutter includes a cutting edge and a clamping part. The step of the winding mechanism acquiring and cutting the first strip includes: The rotary cutter rotates to bring the clamping part closer to the second needle body, and the clamping part and the second needle body clamp the first material strip; The rotary cutter rotates to bring the blade closer to the first needle body, and the first needle body and the blade cut the first strip.

6. The winding method with pre-winding action according to claim 1, characterized in that, The first conveyor line includes two diaphragm conveying units and one first electrode conveying unit. The step of conveying the first material belt to the receiving station by the first conveyor line also includes: The diaphragm delivery unit provides a diaphragm, and the first electrode delivery unit provides the first electrode. Obtain a second offset, which refers to the offset of the diaphragm relative to the first electrode; Control the movement of the diaphragm to counteract the second offset; The two diaphragms are respectively attached to both sides of the first electrode to form the first material strip; The first material strip is sent to the material receiving station.

7. The winding method with pre-winding action according to claim 6, characterized in that, The step of sending the first material strip to the material receiving station includes: Cut the first material strip; Apply protective adhesive to the cut location to reconnect the first strip; Send the pasted first material strip to the material receiving station; Specifically, when applying the protective adhesive, a gap is left between the two sections of the first strip, and the position of the cut in the step of the winding mechanism acquiring and cutting the first strip is consistent with the position of the gap.

8. A multi-station winding device, characterized in that, include: A winding line, the winding line being connected end to end, the winding line including a material receiving station and a winding station, the winding station being located downstream of the material receiving station; A first conveyor line is used to convey a first material belt to the material receiving station; At least three winding mechanisms, which are movable along the winding line; The multi-station winding device further includes a second conveyor line for conveying a second strip to the winding station, and the winding mechanism is capable of extending and retracting along the axial direction to correct the deviation of the second strip.

9. The multi-station winding device according to claim 8, characterized in that: The winding line also includes an adhesive application station and a material unloading station. The winding mechanism can sequentially pass through the material receiving station, the winding station, the adhesive application station, and the material unloading station to return to the material receiving station. A finishing mechanism for closing the winding station and the adhesive application station is installed between them, and an adhesive application mechanism for applying adhesive is installed at the adhesive application station.

10. The multi-station winding device according to claim 8, characterized in that: The winding line also includes a material unloading station. The winding mechanism can sequentially pass through the material receiving station, the winding station, and the material unloading station to return to the material receiving station. The winding station is equipped with a finishing and adhesive application mechanism for finishing and applying adhesive.

11. The multi-station winding device according to claim 8, characterized in that: The first conveyor line includes two diaphragm conveying units and a first electrode conveying unit. The diaphragm conveying units are used to provide diaphragms, and the first electrode conveying unit is used to provide first electrodes. The first conveyor line is capable of attaching the two diaphragms to both sides of the first electrode to form the first material strip.

12. The multi-station winding device according to claim 11, characterized in that: The first conveyor line includes a pre-cutting station for cutting the first material strip and for forming a gap at the cut position of the first material strip and applying protective adhesive.

13. The multi-station winding device according to claim 8, characterized in that: The winding mechanism includes a winding needle and a rotary cutter. The winding needle includes a first needle body and a second needle body, which are used to clamp the first strip. The rotary cutter is located between the first needle body and the second needle body. The rotary cutter includes a cutting edge and a clamping part. The cutting edge is adapted to the first needle body, and the clamping part is adapted to the second needle body. The rotary cutter can rotate to cut the first strip with the cutting edge, and the rotary cutter can rotate to press the first strip with the clamping part.

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