A winding apparatus and a winding method

Abstract

The present application relates to a kind of winding equipment and winding method.The winding equipment includes: winding device, with the winding needle in the first station;Cutting device, arranged downstream of the first station, for cutting the membrane and the first pole piece passing through;And tape separation device, including first separation piece and second separation piece, first separation piece is arranged in the side of cutting device towards the first station, second separation piece can be controlledly moved between first position and second position;Second separation piece moves to first position, and form the membrane gap for membrane and first pole piece to pass through between first separation piece, and first separation piece can fix the membrane passing through, and second separation piece can fix the first pole piece passing through;Second separation piece moves to the second position, can drive first pole piece to leave the first station.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing equipment technology, and in particular to a winding device and winding method. Background Technology

[0002] The battery cell is an important component of a lithium-ion battery. It is generally formed by winding four layers of material strips: separator, cathode electrode, separator, and anode electrode. In order to improve winding efficiency, continuous winding technology for cathode or anode electrodes is often used. That is, each time a battery cell is wound, there is no need to use an electrode feeding device to insert the anode or cathode electrode into the winding needle mechanism, thus saving insertion time.

[0003] In actual production, diaphragms are easily damaged. When a defective section of the diaphragm enters the needle winding mechanism, it needs to be wound up and removed by the needle winding mechanism. However, in continuous winding technology for cathode or anode electrodes, the cathode or anode electrode and the diaphragm are always in a closed state (i.e., the cathode or anode electrode and the diaphragm are stacked side by side). The diaphragm can only be wound up together with the cathode or anode electrode, and the diaphragm cannot be wound up separately, resulting in waste of the cathode or anode electrode. Summary of the Invention

[0004] Therefore, it is necessary to provide a winding device and method that improves upon the above-mentioned defects, in order to address the problem that existing winding equipment can only wind the diaphragm together with the cathode or anode sheet when it needs to wind up the unqualified section of the diaphragm, and cannot wind the diaphragm separately, resulting in the waste of the cathode or anode sheet.

[0005] A winding device having a first station, the winding device comprising:

[0006] A winding device having a winding needle located at the first station, the winding needle being able to fix or loosen a diaphragm or a diaphragm and a first electrode sheet passing through the first station;

[0007] A cutting device, located downstream of the first station, is used to cut off the diaphragm or the diaphragm and the first electrode in transit; and

[0008] The strip separating device includes a first separating member and a second separating member. The first separating member is arranged on the side of the cutting device facing the first station, and the second separating member can be controlled to move between a first position and a second position.

[0009] When the second separating member moves to the first position, a membrane-penetrating gap is formed between it and the first separating member, allowing the diaphragm and the first electrode to pass through. The first separating member can fix the diaphragm that passes through, and the second separating member can fix the first electrode that passes through. When the second separating member moves to the second position, it can drive the first electrode away from the first station.

[0010] In one embodiment, when the second separator moves to the first position, it clamps the diaphragm and the first electrode together with the first separator.

[0011] In one embodiment, the first separator can controllably adsorb and fix the membrane along the path.

[0012] In one embodiment, the second separator can controllably adsorb and fix the first electrode along the path.

[0013] In one embodiment, the winding device further includes a swing drive device, which includes a swing drive member and a swing arm. The swing arm has a first end and a second end that are opposite to each other. The first end is driven to be connected to the swing drive member, and the second end is connected to the second separator. The swing drive member is used to drive the swing arm to swing around the first end, so as to drive the second separator to swing between the first position and the second position.

[0014] In one embodiment, the winding apparatus further includes a motion drive device, which is motive-connected to the second separator to drive the second separator to move between the first position and the second position.

[0015] In one embodiment, the coil needle is capable of extending or retracting along its own axial direction relative to the diaphragm or the diaphragm and the first electrode, and the coil needle has a slit;

[0016] When the winding needle located at the first station extends along its own axis, the diaphragm passing through the first station or the diaphragm and the first electrode can enter the slit.

[0017] In one embodiment, the winding device further includes a second station, the winding device including a turret, at least two winding needles mounted on the turret, and a guide roller located between the first station and the second station; when the turret rotates, it can drive each winding needle to pass through the first station and the second station in sequence; the cutting device and the first separating member are both located between the first station and the second station;

[0018] When the winding needle located at the first station rotates to the second station with the turret, another winding needle rotates to the first station, and the diaphragm or diaphragm and first electrode located between the first station and the second station is wound around the guide roller, so that the winding needle located at the first station can fix the diaphragm or diaphragm and first electrode in the path.

[0019] In one embodiment, two guide rollers are provided, each of which is rotatably connected to the turret about its own axis, and two winding needles are provided;

[0020] When the turret drives the two winding needles to alternately switch between the first station and the second station, the two guide rollers alternately supply the diaphragm passing between the first station and the second station or the diaphragm and the first electrode sheet to pass through.

[0021] In one embodiment, three guide rollers are provided, each of which is rotatably connected to the turret about its own axis; three winding needles are provided, with each guide roller located between two adjacent winding needles; and the winding device also has a third station.

[0022] During the rotation of the turret, the three winding needles can be driven to pass through the first station, the second station and the third station in sequence; when one of the winding needles is located at the first station, the other two winding needles are located at the second station and the third station respectively, passing through the diaphragm between the first station and the second station or the diaphragm and the first electrode sheet are wound around the corresponding guide roller.

[0023] A winding method using the winding equipment described in any of the above embodiments includes a diaphragm single-winding step, the diaphragm single-winding step comprising:

[0024] Downstream of the first station, the second separator is controlled to move toward the first separator to the first position, and the second separator is used to fix the first electrode sheet passing by, and the first separator is used to fix the diaphragm passing by.

[0025] The diaphragm and the first electrode are cut downstream of the first separator and the second separator using the cutting device.

[0026] Control the second separating member to move away from the first separating member to the second position, so that the second separating member drives the first electrode away from the first work station;

[0027] The winding needle located at the first station fixes the diaphragm passing through the first station and winds up any defective sections of the diaphragm.

[0028] In one embodiment, after the step of fixing the diaphragm passing through the first station with the winding needle located at the first station and winding up the defective section of the diaphragm, the method further includes:

[0029] The winding needle located at the first station rotates with the turret to the second station;

[0030] The second separator is controlled to move closer to the first separator until it reaches the first position, so as to drive the first electrode and the diaphragm to come together, and the first separator and the second separator together clamp the first electrode and the diaphragm that are passing by.

[0031] The diaphragm is cut downstream of the first separator and the second separator using the cutting device.

[0032] The winding needle located at the first station fixes the diaphragm and the first electrode sheet passing through the first station.

[0033] In the above-described winding equipment and method, when a defective section of the diaphragm arriving at the first station is detected during actual operation, firstly, the second separating member moves closer to the first separating member until it reaches the first position, allowing the diaphragm and the first electrode to pass through the membrane-penetrating gap between the first and second separating members. Then, the first separating member is controlled to fix the passing diaphragm, and the second separating member is controlled to fix the first electrode. Next, the cutting device cuts the passing diaphragm and the first electrode. Then, the second separating member moves away from the first separating member from the first position until it reaches the second position, at which point the second separating member causes the first electrode to separate from the diaphragm and leave the first station. Then, the winding needle at the first station fixes the diaphragm and winds it up until all the defective sections of the diaphragm are wound onto the winding needle. Finally, the defective section of the diaphragm wound onto the winding needle is unloaded, and the second separator moves from the second position to the first position, thereby driving the first electrode and the diaphragm to be stacked together, so that the winding needle at the first station can fix the diaphragm and the first electrode and wind them to form a battery cell on the winding needle.

[0034] In this way, by using the second separator to move between the first position and the second position, the first electrode sheet is driven away from the first station and separated from the diaphragm, or arrives at the first station and is stacked with the diaphragm. This allows the winding needle to individually wind up and remove the defective sections of the diaphragm, thus avoiding the waste of the first electrode sheet. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a winding device according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 The diagram shown illustrates the structure of the winding device when the second separator drives the first electrode sheet to separate from the diaphragm.

[0037] Figure 3 for Figure 1 The diagram shows the structure of the winding equipment when the winding head is winding up the defective section of the diaphragm;

[0038] Figure 4 for Figure 1 The diagram shows the structure of the winding equipment when the winding needle has finished winding the defective section of the diaphragm and rotated to the second station;

[0039] Figure 5 for Figure 1 The diagram shown is a structural schematic of the winding equipment when the cutting device cuts the diaphragm.

[0040] Figure 6 This is a flowchart illustrating the winding step in a winding method according to an embodiment of the present invention.

[0041] Figure 7 This is a schematic flowchart of the diaphragm single-roll step in the winding method of one embodiment of the present invention. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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 limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] Please see Figure 1 One embodiment of the present invention provides a winding device, including a winding device 20, a cutting device 30, and a strip separating device (not shown in the figure).

[0049] The winding equipment has a first station c1, and the winding device 20 has a winding needle 21 located at the first station c1. The winding needle 21 can fix or release the diaphragm a1 and the first electrode a2 passing through the first station c1. The cutting device 30 is arranged downstream of the first station c1 for cutting the passing diaphragm a1 or the diaphragm a1 and the first electrode a2. The strip separation device includes a first separating member 41 and a second separating member 42. The first separating member 41 is arranged on the side of the cutting device 30 facing the first station c1. The second separating member 42 can be controlled to be positioned at a first position close to the first separating member 41 (see...). Figure 1 ) and the second position away from the first separator 41 (see Figure 2 They move between ( ).

[0050] When the second separating member 42 moves to the first position, a membrane-penetrating gap is formed between the second separating member 42 and the first separating member 41, allowing the diaphragm a1 and the first electrode a2 to pass through. The first separating member 41 can fix the diaphragm a1 passing through the membrane-penetrating gap, and the second separating member 42 can fix the first electrode a2 passing through the membrane-penetrating gap. When the second separating member 42 moves to the second position, the second separating member 42 can drive the first electrode a2 away from the first station c1, that is, the first electrode a2 passing through the first station c1 separates from the diaphragm a1, so that the winding needle 21 can fix the diaphragm a1 and wind the diaphragm a1 separately.

[0051] In the actual operation of the aforementioned winding equipment, when the diaphragm a1 reaching the first station c1 is detected to be a defective segment d, firstly, the second separating member 42 moves closer to the first separating member 41 until it reaches the first position, so that the diaphragm a1 and the first electrode a2 pass through the membrane-penetrating gap between the first separating member 41 and the second separating member 42 (see...). Figure 1 Furthermore, the first separating member 41 is controlled to fix the diaphragm a1 along the path, and the second separating member 42 is controlled to fix the first electrode a2. Then, the cutting device 30 cuts off the diaphragm a1 and the first electrode a2 along the path (see...). Figure 1 Then, the second separating member 42 moves away from the first separating member 41 from the first position until it reaches the second position. At this time, the second separating member 42 drives the first electrode a2 to separate from the diaphragm a1 and leave the first station c1 (see...). Figure 2 Then, the winding needle 21 at the first station c1 fixes the diaphragm a1 and winds it up until all the defective sections d of the diaphragm a1 are wound onto the winding needle 21 (see...). Figure 3 Finally, the defective section d of the diaphragm a1 wound onto the winding needle 21 is unloaded. The second separating member 42 moves from the second position to the first position, thereby causing the first electrode a2 to be brought together and stacked with the diaphragm a1. This allows the winding needle 21 at the first station c1 to fix the diaphragm a1 and the first electrode a2 and wind them to form the battery cell b on the winding needle 21 (see...). Figure 4 and Figure 5 ).

[0052] Thus, by using the second separating member 42 to move between the first position and the second position, the first electrode a2 is driven away from the first station c1 and separated from the diaphragm a1, or reaches the first station c1 and is stacked together with the diaphragm a1, thereby enabling the winding needle 21 to individually wind up and remove the unqualified section d of the diaphragm a1, avoiding the waste of the first electrode a2.

[0053] Furthermore, the winding equipment also includes a film-coating device 10. The film-coating device 10 is arranged upstream of the first station c1 and is used to combine the passing diaphragm a1 and the first electrode a2. The combined diaphragm a1 and the first electrode a2 are stacked and conveyed downstream to the first station c1.

[0054] Specifically, in this embodiment, when the second separating member 42 moves to the first position, the second separating member 42 and the first separating member 41 together clamp the diaphragm a1 and the first electrode a2 passing through the membrane gap between them. Thus, before the cutting device 30 cuts the diaphragm a1 and the first electrode a2, the first separating member 41 and the second separating member 42 clamp the diaphragm a1 and the first electrode a2, thereby improving the cutting quality of the diaphragm a1 and the first electrode a2 by the cutting device 30.

[0055] It should be noted that the first position can be a fixed point or a range of positions, as long as the second separating member 42, when reaching the first position, can clamp and fix the diaphragm a1 and the first electrode a2 together with the first separating member 41. This is not limited here. Similarly, the second position can be a fixed point or a range of positions, as long as the second separating member 42, when reaching the second position, can move the first electrode a2 away from the first station c1. This is not limited here.

[0056] Specifically, in this embodiment, the first separating member 41 can controllably adsorb the diaphragm a1 passing through the membrane perforation gap, thereby fixing the diaphragm a1. When it is necessary to fix the diaphragm a1, the first separating member 41 is controlled to adsorb the diaphragm a1 so that when the first electrode a2 is taken away by the second separating member 42, the diaphragm a1 will not move with the first electrode a2. When it is not necessary to fix the diaphragm a1, the first separating member 41 is controlled to stop adsorbing the diaphragm a1. It should be noted that the first separating member 41 can use vacuum adsorption to adsorb the diaphragm a1, for example, the first separating member 41 is a vacuum adsorption plate. Of course, in other embodiments, the first separating member 41 can also use other methods to fix the diaphragm a1 passing through the membrane perforation gap, such as electrostatic adsorption, etc., which are not limited here.

[0057] Specifically, in this embodiment, the second separating member 42 can controllably adsorb the first electrode a2 passing through the membrane gap, thereby fixing the first electrode a2. When it is necessary to fix the first electrode a2, the second separating member 42 is controlled to adsorb the first electrode a2, so that when the second separating member 42 moves from the first position to the second position, it can carry away the first electrode a2. When it is not necessary to fix the first electrode a2, the second separating member 42 is controlled to stop adsorbing the first electrode a2. It should be noted that the second separating member 42 can use vacuum adsorption to adsorb the first electrode a2, for example, the second separating member 42 is a vacuum adsorption plate. Of course, in other embodiments, the second separating member 42 can also use other methods to fix the first electrode a2 passing through the membrane gap, such as electrostatic adsorption, etc., which are not limited here.

[0058] In some embodiments, the second separating member 42 can switch between a first position and a second position by oscillation. Specifically, the winding device further includes an oscillation drive (not shown), which includes an oscillation drive member (not shown) and a swing arm (not shown). The swing arm has a first end (not shown) and a second end (not shown) opposite to each other. The first end is driven to the oscillation drive member, and the second end is connected to the second separating member 42. The oscillation drive member drives the swing arm to oscillate around the first end, thereby causing the second separating member 42 to oscillate between the first position and the second position. Optionally, the oscillation drive member can be a motor.

[0059] It should be noted that the second separating member 42 is not limited to a swinging motion. In other embodiments, the second separating member 42 can also switch between the first and second positions by moving (e.g., linear movement). Specifically, the winding equipment also includes a moving drive device (not shown), which is drivenly connected to the second separating member 42 to drive the second separating member 42 to move between the first and second positions. Optionally, the moving drive device can be a linear motor, an electric cylinder, a pneumatic cylinder, a ball screw linear module, etc., and is not limited here.

[0060] Specifically, in this embodiment, the winding needle 21 can controllably extend or retract along its own axial direction relative to the diaphragm a1 or the diaphragm a1 and the first electrode a2, and the winding needle 21 has a slit 210. When the winding needle 21 located at the first station c1 extends along its own axial direction, the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing through the first station c1 can enter the slit 210, so that the winding needle 21 can clamp and fix the diaphragm a1 or the diaphragm a1 and the first electrode a2 entering the slit 210, thereby winding up the defective section d of the diaphragm a1 or winding the diaphragm a1 and the first electrode a2 to form the battery cell b. Further, the winding needle 21 is provided with two inner clamping needles (not shown in the figure), which are used to clamp and fix the diaphragm a1 or the diaphragm a1 and the first electrode a2 entering the slit 210. As for the specific structure of the winding needle 21, relatively mature existing technology can be used, and it is not limited here.

[0061] In the embodiments of this application, the winding device 20 includes a turret 25, at least two winding needles 21, and a guide roller 23. The at least two winding needles 21 are all mounted on the turret 25. The winding device also has a second station c2, and when the turret 25 rotates, it can drive each winding needle 21 sequentially through the first station c1 and the second station c2. The first separating member 41 of the cutting device 30 and the strip separating device are both located between the first station c1 and the second station c2, thereby enabling the cutting device 30 to cut the diaphragm a1 and the first electrode a2 passing between the first station c1 and the second station c2, the first separating member 41 to adsorb and fix the diaphragm a1 passing between the first station c1 and the second station c2, and the second separating member 42 to adsorb and fix the first electrode a2 passing between the first station c1 and the second station c2.

[0062] When the winding needle 21 located at the first station c1 rotates with the turret 25 to the second station c2, another winding needle 21 rotates to the first station c1, and the diaphragm a1 or diaphragm a1 and the first electrode a2 located between the first station c1 and the second station c2 is wound around the guide roller 23, so that the diaphragm a1 or diaphragm a1 and the first electrode a2 passing through the first station c1 are aligned with the slit 210 of the winding needle 21 located at the first station c1. At this time, when the winding needle 21 located at the first station c1 extends along its own axial direction, the diaphragm a1 or diaphragm a1 and the first electrode a2 passing through the first station c1 can enter the slit 210 of the winding needle 21 and be clamped and fixed.

[0063] Thus, during the winding operation, after the diaphragm a1 and the first electrode a2 are joined together at the film-joining device 10, they are then conveyed to the winding needle 21 at the first station c1. The winding needle 21 at the first station c1 rotates and winds the joined diaphragm a1 and the first electrode a2 to form the battery cell b.

[0064] When one battery cell b is wound, the winding needle 21 at the first station c1 stops rotating and rotates with the turret 25 to the second station c2. Simultaneously, another winding needle 21 rotates with the turret 25 to the first station c1. At this time, due to the rotation of the turret 25, the diaphragm a1 and the first electrode a2 located between the first station c1 and the second station c2 are wound onto the guide roller 23. Under the guidance of the guide roller 23 and the film-coating device 10, the slit 210 of the winding needle 21 at the first station c1 aligns with the diaphragm a1 and the first electrode a2 passing through the first station c1. The winding needle 21 at the first station c1 is controlled to extend axially, causing the diaphragm a1 and the first electrode a2 passing through the first station c1 to enter the slit 210 of the winding needle 21 and be clamped and fixed. Then, the cutting device 30 cuts the diaphragm a1 and the first electrode a2 passing between the first station c1 and the second station c2, causing the battery cell b on the winding needle 21 at the second station c2 to separate from the upstream diaphragm a1 and the first electrode a2, so that the battery cell b on the winding needle 21 can be further processed and unloaded. Furthermore, since the diaphragm a1 and the first electrode a2 passing through the first station c1 are clamped and fixed by the winding needle 21 at the first station c1, the rotation of the winding needle 21 at the first station c1 can realize the winding and forming of the next battery cell b.

[0065] When the diaphragm a1 input to the first station c1 is a defective segment d, the winding needle 21 located at the first station c1 stops rotating and rotates with the turret 25 to the second station c2. At the same time, another winding needle 21 rotates with the turret 25 to the first station c1 (see...). Figure 1 Then, the second separator 42 moves toward the first separator 41 until it reaches the first position. At this time, the diaphragm a1 and the first electrode a2 pass through the membrane gap between the first separator 41 and the second separator 42, and are thus clamped by the first separator 41 and the second separator 42 (see...). Figure 1 Then, the cutting device 30 cuts the diaphragm a1 and the first electrode a2 passing between the first station c1 and the second station c2, so that the battery cell b on the winding needle 21 located at the second station c2 is separated from the upstream diaphragm a1 and the first electrode a2, so as to facilitate subsequent processing and unloading of the battery cell b on the winding needle 21 (see...). Figure 2 Then, the first separating member 41 adsorbs and fixes the diaphragm a1, and the second separating member 42 adsorbs and fixes the first electrode a2, and controls the second separating member 42 to move away from the first separating member 41 until it reaches the second position (see...). Figure 2At this point, the first electrode a2 separates from the diaphragm a1 under the action of the second separating element 42, so that the material strip passing through the first station c1 contains only the diaphragm a1 and not the first electrode a2. Then, the winding needle 21 located at the first station c1 fixes the diaphragm a1 and rotates to wind up the defective section d of the diaphragm a1 onto the winding needle 21, until all the defective sections d of the diaphragm a1 are wound onto the winding needle 21 (see...). Figure 3 ).

[0066] After the defective section d of diaphragm a1 is wound up, the winding needle 21 at the first station c1 stops rotating and rotates with the turret 25 to the second station c2. Simultaneously, another winding needle 21 rotates with the turret 25 to the first station c1. Then, the second separating member 42 moves toward the first separating member 41 until it reaches the first position (see...). Figure 4 At this point, the second separating component 42 drives the first electrode a2 to be stacked with the diaphragm a1 again, so that the material strip passing through the first station c1 includes the diaphragm a1 and the first electrode a2. Then, the winding needle 21 located at the first station c1 extends along its own axis, so that the diaphragm a1 and the first electrode a2 passing through the first station c1 enter the slit 210 of the winding needle 21 and are clamped and fixed. The cutting component cuts the passing diaphragm a1, so that the defective section d of the diaphragm a1 on the winding needle 21 located at the second station c2 is separated from the diaphragm a1, so as to remove the defective section d of the diaphragm a1 on the winding needle 21 (see Figure 5 Meanwhile, the winding needle 21 located at the first station c1 rotates to wind the diaphragm a1 and the first electrode a2 to form the battery cell b.

[0067] It should be noted that the above operation steps are not limited to these. As long as the winding of cell b and the unqualified section d of separator a1 can be achieved, no limitation is made here.

[0068] Please see Figures 1 to 5In the illustrated embodiments, in some embodiments, there are two guide rollers 23, both of which are rotatably mounted on the turret 25 about their own axes. There are also two winding needles 21. When the turret 25 drives the two winding needles 21 to alternately switch between the first station c1 and the second station c2, the two guide rollers 23 alternately allow the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing between the first station c1 and the second station c2 to pass through. Thus, under the combined action of the guide rollers 23 and the film-coating device 10, the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing through the first station c1 are aligned with the slit 210 on the winding needle 21 located at the first station c1. As a result, when the winding needle 21 located at the first station c1 extends along its own axial direction, the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing through the first station c1 can enter the slit 210 of the winding needle 21 and be clamped and fixed. In other words, every time the turret 25 rotates 180°, the winding needle 21 located at the first station c1 rotates with the turret 25 to the second station c2, and at the same time, the winding needle 21 located at the second station c2 rotates with the turret 25 to the first station c1, thus driving the two winding needles 21 to achieve a position switch between the first station c1 and the second station c2.

[0069] It should be noted that, in this embodiment, the first station c1 can be a winding station, where the winding needle 21 at the first station c1 can wind the diaphragm a1 and the first electrode a2 to form the battery cell b when it rotates, or can wind up the defective section d of the diaphragm a1. The second station c2 can be a unloading station, where the winding needle 21 can unload the battery cell b or the defective section d of the diaphragm a1 on the winding needle 21 when it reaches the second station c2.

[0070] In other embodiments, there are three guide rollers 23, each rotatably connected to the turret 25 about its own axis. There are also three winding needles 21, spaced apart along the rotation direction of the turret 25, with each guide roller 23 located between two adjacent winding needles 21. The winding device also has a third station (not shown), which, during the rotation of the turret 25, drives the three winding needles 21 sequentially through the first station c1, the second station c2, and the third station. When one of the winding needles 21 is located at the first station c1, the other two winding needles 21 are located at the second station c2 and the third station respectively. The diaphragm a1 or the diaphragm a1 and the first electrode a2 passing between the first station c1 and the second station c2 are wound around the corresponding guide roller 23. Thus, under the combined action of the guide roller 23 and the film-coating device 10, the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing through the first station c1 are aligned with the slit 210 on the winding needle 21 located at the first station c1. As a result, when the winding needle 21 located at the first station c1 extends axially, the diaphragm a1 or the diaphragm a1 and the first electrode a2 passing through the first station c1 can enter the slit 210 of the winding needle 21 and be clamped and fixed. In other words, every time the turret 25 rotates 120°, the winding needle 21 located at the first station c1 follows the turret 25 to the second station c2, and at the same time, the winding needle 21 located at the second station c2 follows the turret 25 to the third station, and the winding needle 21 located at the third station follows the turret 25 to the first station c1.

[0071] It should be noted that, in this embodiment, the first station c1 can be a winding station, where the winding needle 21 at the first station c1 can wind the diaphragm a1 and the first electrode a2 to form the battery cell b when it rotates, or can rewind the defective section d of the diaphragm a1. The second station c2 can be a finishing and adhesive application station, where the winding needle 21 at the second station c2 can rotate to wind the tail ends of the diaphragm a1 and the first electrode a2, and use adhesive tape to attach the tail ends of the diaphragm a1 to the battery cell b to prevent the battery cell b from becoming loose. The third station can be a unloading station, where the winding needle 21 can unload the battery cell b or the defective section d of the diaphragm a1 on the winding needle 21 when it reaches the third station.

[0072] In the embodiments of this application, the diaphragm a1 is configured as two layers. The two layers of diaphragm a1 and the first electrode a2 are stacked together at the film-coating device 10 and then transported to the winding needle 21 at the first station c1 for winding. The two layers of diaphragm a1 are located on the same side of the first electrode a2. It can be understood that in order for the first separating member 41 to adsorb and fix the two layers of diaphragm a1 and the second separating member 42 to adsorb and fix the first electrode a2, when the two layers of diaphragm a1 and the first electrode a2 pass through the film-passing gap between the first separating member 41 and the second separating member 42, the two layers of diaphragm a1 are located on the side of the first electrode a2 facing the first separating member 41, and the first electrode a2 is located on the side of the two layers of diaphragm a1 facing the second separating member 42.

[0073] It should be noted that the two diaphragm layers a1 will adhere together due to electrostatic attraction. Therefore, when the first separating member 41 adsorbs the diaphragm layer a1, both diaphragm layers a1 will be adsorbed and fixed on the first separating member 41. Of course, in order to make the first separating member 41 more firmly adsorb and fix the two diaphragm layers a1, the cutting device 30 can use a thermal cutting method to cut the two diaphragm layers a1 and the first electrode a2. The cut ends of the two diaphragm layers a1 will be joined together by thermal fusion, thereby ensuring that the two diaphragm layers a1 can be more firmly adsorbed and fixed on the first separating member 41 when it adsorbs the diaphragm layer a1.

[0074] It should also be noted that a second electrode (not shown in the figure) is included between the two separators a1 in the wound cell b. This second electrode has the opposite polarity to the first electrode a2. That is, when the second electrode is the cathode, the first electrode a2 is the anode. When the second electrode is the anode, the first electrode a2 is the cathode.

[0075] Because the winding equipment in this application adopts a winding operation method in which the first electrode a2 is continuously wound and the second electrode is not continuously wound. That is to say, when a cell b is about to be wound, the second electrode is cut off by the upstream of the film-coating device 10 (at this time, the first electrode a2 is not cut off), and the winding needle 21 located at the first station c1 continues to wind until the tail end of the second electrode is wound onto the winding needle 21 and covered by two layers of separator a1. After the winding of one cell b is completed and before the winding of the next cell b, the first electrode a2 does not need to undergo the insertion process, while the second electrode does need to undergo the insertion process, that is, the end of the second electrode is inserted into the film-coating device 10, and then follows the separator a1 to the first station c1 and is wound onto the winding needle 21 located at the first station c1.

[0076] It should be noted that the cutting and insertion of the second electrode can be accomplished using relatively mature cutting and insertion devices, and no limitation is made here.

[0077] Based on the aforementioned winding equipment, this application also provides a winding method using the winding equipment. The winding method includes a winding step S10 and a diaphragm single-winding step S20. In the winding step S10, a winding needle 21 located at the first station c1 is used to wind the diaphragm a1, the first electrode a2, and the second electrode to form a battery cell b on the winding needle 21. It can be understood that the diaphragm a1 is configured as two layers, with both layers located on the same side of the first electrode a2, and the second electrode located between the two layers of diaphragm a1. That is, four layers of material strip are stacked and wound onto the winding needle 21 located at the first station c1 in the order of diaphragm a1, second electrode, diaphragm a1, and first electrode to form the battery cell b.

[0078] During the winding step S10, if the detection finds that the diaphragm a1 conveyed to the first station c1 is a defective segment d, the winding step S10 is stopped, and the diaphragm single-winding step S20 is executed to separately wind up the defective segment d of the diaphragm a1 conveyed to the first station c1.

[0079] Please see Figure 6 As shown, in a specific embodiment, the winding step S10 includes the following steps:

[0080] S11. The end of the second electrode is fed into the film-coating device 10, and then follows the diaphragm a1 to the winding needle 21 located at the first station c1. At this time, the two layers of diaphragm a1, the first electrode a2 and the second electrode are fed to the winding needle 21 at the first station c1 after being brought together by the film-coating device 10.

[0081] S12, the winding needle 21 located at the first station c1 rotates to wind the diaphragm a1, the first electrode a2 and the second electrode onto the winding needle 21 to form the battery cell b.

[0082] S13. When the winding of cell b on the winding needle 21 at the first station c1 is completed, the second electrode is cut off upstream of the film-coating device 10. The winding needle 21 at the first station c1 stops rotating and rotates with the turret 25 to the second station c2, while another winding needle 21 rotates with the turret 25 to the first station c1. At this time, due to the rotation of the turret 25, the diaphragm a1 and the first electrode a2 located between the first station c1 and the second station c2 are wound on the guide roller 23. Under the guidance of the guide roller 23 and the film-coating device 10, the slit 210 on the winding needle 21 at the first station c1 is aligned with the diaphragm a1 and the first electrode a2 passing through the first station c1.

[0083] S14. The winding needle 21 located at the first station c1 extends toward the passing diaphragm a1 and the first electrode a2, so that the diaphragm a1 and the first electrode a2 enter the slit 210 of the winding needle 21 located at the first station c1, thereby causing the winding needle 21 to clamp the diaphragm a1 and the first electrode a2.

[0084] S15. The cutting device 30 cuts the diaphragm a1 and the first electrode a2 between the first station c1 and the second station c2, so that the battery cell b on the winding needle 21 located at the second station c2 is separated from the upstream diaphragm a1 and the first electrode a2, so as to facilitate subsequent processing and unloading of the battery cell b on the winding needle 21. It should be noted that the battery cell b on the winding needle 21 located at the second station c2 can be unloaded at the second station c2, or the finishing adhesive can be applied at the second station c2 and then unloaded at the third station c3, which is not limited here.

[0085] S16. Repeat steps S11 to S15 to achieve mass production of cell b.

[0086] Please see Figure 7 As shown, in a specific embodiment, the single-roll diaphragm step S20 includes the following steps:

[0087] S21. Downstream of the first station c1, the second separating member 42 is controlled to move toward the first separating member 41 to a first position, and the second separating member 42 is used to fix the passing first electrode a2, and the first separating member 41 is used to fix the passing diaphragm a1. Specifically, the first separating member 41 is used to adsorb and fix the diaphragm a1, and the second separating member 42 is used to adsorb and fix the first electrode a2. Further, when the second separating member 42 moves to the first position, the first separating member 41 and the second separating member 42 together clamp the diaphragm a1 and the first electrode a2.

[0088] S22. The diaphragm a1 and the first electrode a2 are cut downstream of the first separator 41 and the second separator 42 using the cutting device 30, so that the cut end of the diaphragm a1 is adsorbed and fixed by the first separator 41, and the cut end of the first electrode a2 is adsorbed and fixed by the second separator 42.

[0089] S23. Control the second separating member 42 to move away from the first separating member 41 to the second position, so that the second separating member 42 drives the first electrode a2 to separate from the diaphragm a1 and leave the first station c1. That is, at this time, the material belt passing through the first station c1 only has the diaphragm a1.

[0090] S24. The winding needle 21 located at the first station c1 fixes the diaphragm a1 passing through the first station c1 and winds up the defective section d of the diaphragm a1. Specifically, firstly, the winding needle 21 located at the first station c1 extends toward the diaphragm a1 passing through the first station c1, so that the diaphragm a1 enters the slit 210 of the winding needle 21, thereby causing the winding needle 21 to clamp the diaphragm a1. Then, the winding needle 21 located at the first station c1 rotates, thereby realizing the separate winding of the defective section d of the diaphragm a1.

[0091] S25. The winding needle 21 located at the first station c1 rotates with the turret 25 to the second station c2, so that the defective section d of the diaphragm a1 wound on the winding needle 21 also leaves the first station c1, so as to facilitate the subsequent feeding and unloading of the defective section d of the diaphragm a1 on the winding needle 21. At the same time, another winding needle 21 on the turret 25 rotates with the turret 25 to the first station c1. It should be noted that the defective section d of the diaphragm a1 on the winding needle 21 can be unloaded at the second station c2, or it can be unloaded at the third station c3, which is not limited here.

[0092] S26. Control the second separator 42 to move closer to the first separator 42 until it reaches the first position, so as to drive the first electrode a2 and the diaphragm a1 to come together, and the first separator 41 and the second separator 42 together clamp the first electrode a2 and the diaphragm a1. At this time, the material belt passing through the first station c1 consists of the diaphragm a1 and the first electrode a2.

[0093] S27. The diaphragm a1 is cut downstream of the first separator 41 and the second separator 42 using the cutting device 30. At this time, the cut end of the diaphragm a1 and the cut end of the first electrode a2 are clamped by the first separator 41 and the second separator 42.

[0094] S28. The winding needle 21 located at the first station c2 fixes the diaphragm a1 and the first electrode a2 passing through the first station c1. Specifically, the winding needle 21 located at the first station c1 extends toward the diaphragm a1 and the first electrode a2 passing through the first station c1, so that the diaphragm a1 and the first electrode a2 enter the slit 210 of the winding needle 21, thereby causing the winding needle 21 to clamp the diaphragm a1 and the first electrode a2. At this time, the above winding step S10 can be performed again to wind and form the battery cell b.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A winding apparatus characterized by comprising: The winding device comprises: a first station, a winding device comprising a winding needle located at the first station, the winding needle being capable of fixing or releasing a diaphragm or a diaphragm and a first pole piece passing through the first station; a cutting device arranged downstream of the first station for cutting a passing diaphragm or diaphragm and first pole piece; and a material belt separating device comprising a first separating member and a second separating member, the first separating member being arranged on a side of the cutting device facing the first station, and the second separating member being controllably movable between a first position and a second position; 2. The winding apparatus according to claim 1, characterized by, wherein the second separating member, when moved to the first position, forms a diaphragm passing gap with the first separating member, the first separating member being capable of fixing a passing diaphragm, and the second separating member being capable of fixing a passing first pole piece; and the second separating member, when moved to the second position, is capable of leading the first pole piece out of the first station, and the winding needle is capable of fixing and winding a passing diaphragm through the first station.

3. The winding apparatus according to claim 1, characterized by, The second separating member, when moved to the first position, clamps a passing diaphragm and first pole piece together with the first separating member.

4. The winding apparatus according to claim 1, characterized by, The first separating member is capable of controllably adsorbing and fixing a passing diaphragm.

5. The winding apparatus according to claim 1, characterized by, The second separating member is capable of controllably adsorbing and fixing a passing first pole piece.

6. The winding apparatus according to claim 1, characterized by, The winding device further comprises a swing driving device, the swing driving device comprising a swing driving member and a swing arm, the swing arm having a first end and a second end opposite to each other; the first end is drivingly connected with the swing driving member, and the second end is connected with the second separating member; the swing driving member is used to drive the swing arm to swing around the first end, so as to drive the second separating member to swing between the first position and the second position.

7. The winding apparatus according to any one of claims 1 to 6, characterized by, The winding device further comprises a moving driving device, the moving driving device being drivingly connected with the second separating member, so as to drive the second separating member to move between the first position and the second position. The winding needle is capable of extending or retracting along an axial direction of itself relative to a passing diaphragm or diaphragm and first pole piece, and the winding needle has a slit; 8. The winding apparatus according to any one of claims 1 to 6, characterized by, When the winding needle located at the first station extends along an axial direction of itself, the diaphragm or diaphragm and first pole piece passing through the first station can enter into the slit. The winding device further comprises a second station, the winding device comprising a turret, at least two winding needles mounted on the turret, and a guide roller located between the first station and the second station; the turret is capable of driving each winding needle to pass through the first station and the second station in turn when the turret rotates; the cutting device and the first separating member are both located between the first station and the second station; When the winding needle located at the first station rotates to the second station with the turret, another winding needle rotates to the first station, and a diaphragm or diaphragm and first pole piece located between the first station and the second station passes around the guide roller, so that the winding needle located at the first station is capable of fixing and winding a passing diaphragm or diaphragm and first pole piece.

9. The winding apparatus according to claim 8, characterized by The guide rollers are provided in two, and each of the two guide rollers is rotatably connected to the turret about its own axis, and the winding needles are provided in two; when the turret drives the two winding needles to alternately switch between the first station and the second station, the two guide rollers alternately pass the diaphragm or the diaphragm and the first pole piece between the first station and the second station; or, The guide rollers are provided in three, and each of the three guide rollers is rotatably connected to the turret about its own axis, and the winding needles are provided in three, each of the guide rollers is located between two adjacent winding needles, and the winding device further has a third station; during the rotation of the turret, the three winding needles can pass through the first station, the second station and the third station in turn; when one of the winding needles is located at the first station, the other two winding needles are located at the second station and the third station respectively, and the diaphragm or the diaphragm and the first pole piece passing through between the first station and the second station are wound on the corresponding guide rollers.

10. A winding method applying the winding apparatus as claimed in any one of claims 1 to 9, characterized by, The diaphragm single winding step comprises: Downstream of the first station, the second separating piece is controlled to move towards the first separating piece to the first position, and the first pole piece passing through is fixed by the second separating piece, and the diaphragm passing through is fixed by the first separating piece; The cutting device is used to cut the diaphragm and the first pole piece downstream of the first separating piece and the second separating piece; The second separating piece is controlled to move away from the first separating piece to the second position, so that the second separating piece drives the first pole piece to leave the first station; The winding needle located at the first station fixes the diaphragm passing through the first station, and the unqualified section of the diaphragm is wound.

11. The winding method according to claim 10, characterized in that, The winding needle located at the first station is further rotated to the second station with the turret after the step of fixing the diaphragm passing through the first station by the winding needle located at the first station and winding the unqualified section of the diaphragm; The second separating piece is controlled to move towards the first separating piece until the first position is reached to drive the first pole piece to be close to the diaphragm, and the first separating piece and the second separating piece jointly clamp the first pole piece and the diaphragm passing through; The cutting device is used to cut the diaphragm downstream of the first separating piece and the second separating piece; The winding needle located at the first station fixes the diaphragm and the first pole piece passing through the first station. ​

Images