A lamination device and lamination method

Abstract

The present invention provides a lamination device and a lamination method, belonging to the technical field of lithium battery production, including: a vertical plate; a lamination table, which is movably arranged and there are several of them, and each lamination table is provided with a pressing knife; a diaphragm unwinding mechanism, which is arranged on the vertical plate, and the diaphragm unwinding mechanism is adapted to reciprocate horizontally. Several lamination tables can move alternately so that one of the several lamination tables can move to the lower part of the diaphragm unwinding mechanism; a pole piece feeding mechanism, which is arranged corresponding to the lamination table; a flattening mechanism, which is arranged on the vertical plate and is movably arranged. The flattening mechanism is located above the lamination table and below the diaphragm unwinding mechanism and is adapted to drive the diaphragm to move horizontally; a cutting mechanism, which is adapted to cut off the diaphragm downstream of the flattening mechanism. The lamination device provided by the present invention realizes simultaneous blanking and lamination, can greatly shorten the blanking auxiliary time of lamination, that is, shorten the stop time of the lamination process, and improve the production efficiency of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and particularly to a laminating device and a laminating method. Background Art

[0002] During the process of manufacturing battery cores by laminating lithium batteries, a manipulator is usually used to move left and right to alternately stack positive and negative electrode sheets on a laminating table. And between adjacent positive and negative electrode sheets, a layer of separator is stacked through a separator unwinding mechanism, and the separator moves left and right in a reciprocating motion to stack in a Z shape. After laminating, the separator is cut off, and then a blanking manipulator is used to clamp the battery core and remove it for blanking. Therefore, during the blanking process of the battery core, the laminating process needs to be stopped, and after the blanking of the battery core is completed, the next laminating can be carried out, resulting in low production efficiency. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low production efficiency in the prior art of manufacturing battery cores by laminating, so as to provide a laminating device and a laminating method.

[0004] To solve the above problems, the present invention provides a laminating device, including: a vertical plate; a plurality of laminating tables, which are movably arranged, and each of the laminating tables is provided with a pressing knife; a separator unwinding mechanism, which is arranged on the vertical plate, and the separator unwinding mechanism is adapted to reciprocate horizontally. A plurality of the laminating tables can move alternately, so that one of the plurality of laminating tables can move to the lower part of the separator unwinding mechanism; a pole piece feeding mechanism, which is arranged corresponding to the laminating table; a flattening mechanism, which is arranged on the vertical plate and is movably arranged, and the flattening mechanism is located above the laminating table and below the separator unwinding mechanism, and is adapted to drive the separator to move horizontally; a cutting mechanism, which is adapted to cut off the separator downstream of the flattening mechanism.

[0005] Optionally, the flattening mechanism includes a pair of flattening rollers arranged oppositely, and the separator is allowed to pass through between the pair of flattening rollers.

[0006] Optionally, the flattening mechanism is telescopically arranged longitudinally.

[0007] Optionally, the separator unwinding mechanism includes a separator buffer structure, and the length of the separator buffered in the separator buffer structure is adjustable.

[0008] Optionally, the laminating device further includes a film clamping mechanism, and the film clamping mechanism is adapted to clamp the separator above or below the flattening mechanism and close to the flattening mechanism.

[0009] Optionally, the film clamping mechanism can move synchronously with the flattening mechanism horizontally.

[0010] Optionally, the film clamping mechanism is telescopically arranged longitudinally.

[0011] Optionally, the film clamping mechanism includes a pair of clamping rollers arranged oppositely, and a separator is adapted to be clamped between the pair of clamping rollers.

[0012] Optionally, the laminating device further includes a blanking mechanism, and the blanking mechanism is correspondingly arranged with the laminating tables among several laminating tables that are far from the separator unwinding mechanism.

[0013] The present invention also provides a laminating method, which is applied to the above laminating device, and includes: one of several laminating tables moves to the laminating station for laminating. Wherein, the separator unwinding mechanism reciprocates above the laminating station to lay a separator on the laminating table at the laminating station, and a positive electrode sheet or a negative electrode sheet is stacked on the separator through the electrode sheet feeding mechanism; after the last layer of electrode sheet is stacked on the laminating table located at the laminating station, the flattening mechanism moves transversely between the laminating table and the separator unwinding mechanism and drives the separator to move to lay a separator on the last layer of electrode sheet to complete the laminating; the laminating table located at the laminating station moves to the blanking station, and another laminating table among several laminating tables moves to the laminating station, and the cutting mechanism cuts the separator downstream of the flattening mechanism; the laminating table located at the blanking station performs blanking, and the pressing knife on the laminating table located at the laminating station presses the separator between the flattening mechanism and the separator unwinding mechanism onto the laminating table to perform laminating.

[0014] Optionally, after the laminating table located at the blanking station finishes blanking, it moves to the waiting station. When the laminating table located at the laminating station finishes laminating and moves towards the blanking station, the laminating table located at the waiting station moves towards the laminating station.

[0015] Optionally, the blanking station is located below the laminating station, and the waiting station is located in front of the laminating station and is arranged at the same height.

[0016] Optionally, after the laminating table located at the blanking station finishes blanking, it moves a predetermined distance on the horizontal plane where the laminating table is located to move out from the blanking station. After that, the laminating table moves one or more times along the vertical direction and the horizontal direction and finally moves to the laminating station.

[0017] Optionally, after laminating is completed, the laminating table located at the laminating station moves downward to the blanking station and drives the separator to extend to the blanking station. After that, the cutting mechanism cuts the separator.

[0018] Optionally, after the cutting mechanism cuts the separator, the separator buffer structure retracts the separator exceeding the flattening mechanism to make the cut end of the separator correspond to the laminating table located at the laminating station.

[0019] Optionally, the cutting mechanism cuts the separator at the position of the pressing knife on the laminating table near the blanking station.

[0020] Optionally, after the lamination is completed, the film clamping mechanism located above the flattening mechanism clamps and fixes the separator, and the cutting mechanism cuts off the separator. Then, the lamination table at the lamination station moves towards the unloading station.

[0021] Optionally, during the lamination process, every time a layer of positive electrode sheet or negative electrode sheet is stacked on the lamination table at the lamination station, the lamination table moves downward by a preset distance, so that the electrode sheet feeding mechanism or the separator unwinding mechanism feeds materials at the same height each time.

[0022] The present invention has the following advantages:

[0023] 1. For the lamination device provided by the present invention, the lamination table after lamination is completed moves to the unloading station for unloading, and another lamination table moves to the lamination station for lamination. Therefore, the lamination device realizes simultaneous unloading and lamination, which can significantly shorten the auxiliary time for unloading during lamination, that is, shorten the stop time during the lamination process, and improve the production efficiency of the battery cell.

[0024] 2. For the lamination device provided by the present invention, after the separator is cut off, the separator exceeding the flattening mechanism is retracted through the separator buffer structure, which avoids waste of the separator and improves the production quality.

[0025] 3. For the lamination device provided by the present invention, by setting the film clamping mechanism and cooperating with cutting the separator at the lamination station, the separator does not need to be retracted, further reducing the auxiliary time and facilitating the reuse of the separator for lamination.

[0026] 4. For the lamination device provided by the present invention, the film clamping mechanism and the flattening mechanism move reciprocally synchronously, and during the reciprocating movement, the film clamping mechanism does not need to clamp the separator, and only clamps the separator when the lamination is completed. The flattening mechanism and the film clamping mechanism are convenient to use.

[0027] 5. For the lamination device provided by the present invention, when it is necessary to use the flattening mechanism and / or the film clamping mechanism to clamp the separator, the flattening mechanism and / or the film clamping mechanism extend longitudinally. During the lamination process, when it is not necessary to use the flattening mechanism and / or the film clamping mechanism, the flattening mechanism and / or the film clamping mechanism can be retracted longitudinally. The flattening mechanism and / or the film clamping mechanism are convenient to use, ensuring that the flattening mechanism and / or the film clamping mechanism do not interfere with the lamination process.

[0028] 6. For the lamination method provided by the present invention, when the lamination table completes unloading at the unloading station, the lamination table first moves to the waiting station. When the lamination table at the lamination station completes lamination and moves towards the unloading station, the lamination table at the waiting station simultaneously moves towards the lamination station. Therefore, a new lamination table can be quickly replenished at the lamination station, shortening the production preparation time and further improving the production efficiency.

[0029] 7. A lamination method provided by the present invention sets the blanking station below the lamination station, and sets the waiting station in front of the lamination station and at the same height, making the movement of the lamination table more convenient.

[0030] 8. A lamination method provided by the present invention uses a cutting mechanism to cut the diaphragm near the laminated battery cell, so that there is no excess diaphragm on the laminated battery cell, ensuring the production quality of the battery cell. Moreover, the diaphragm can be retracted to the greatest extent for reuse, avoiding waste.

[0031] 9. A lamination method provided by the present invention, through the cooperation of the film clamping mechanism and the cutting mechanism, cuts the diaphragm at the lamination station and then performs the blanking process. After cutting, there is no need to retract the diaphragm further, further improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 FIG. 1 shows a schematic diagram of the first state during the lamination process of the lamination table of the lamination device provided in Embodiment 1 of the present invention at the lamination station;

[0034] Figure 2 FIG. 2 shows a schematic diagram of the second state during the lamination process of the lamination table of the lamination device provided in Embodiment 1 of the present invention at the lamination station;

[0035] Figure 3 FIG. 3 shows a schematic diagram of the third state during the lamination process of the lamination table of the lamination device provided in Embodiment 1 of the present invention at the lamination station;

[0036] Figure 4 FIG. 4 shows a schematic diagram of the flattening mechanism of the lamination device provided in Embodiment 1 of the present invention when clamping the diaphragm;

[0037] Figure 5 FIG. 5 shows a schematic diagram of the flattening mechanism of the lamination device provided in Embodiment 1 of the present invention driving the diaphragm to move and lay;

[0038] Figure 6 FIG. 6 shows a schematic diagram of the two lamination tables of the lamination device provided in Embodiment 1 of the present invention after alternating movement;

[0039] Figure 7 FIG. 7 shows a schematic diagram of the cutting mechanism of the lamination device provided in Embodiment 1 of the present invention when cutting the diaphragm;

[0040] Figure 8 Shows a schematic diagram of the first step of the lamination method provided in Embodiment 3 of the present invention;

[0041] Figure 9 Shows a schematic diagram of the second step of the lamination method provided in Embodiment 3 of the present invention;

[0042] Figure 10 Shows a schematic diagram of the third step of the lamination method provided in Embodiment 3 of the present invention;

[0043] Figure 11 Shows a schematic diagram of the fourth step of the lamination method provided in Embodiment 3 of the present invention;

[0044] Figure 12 Shows a schematic diagram of the fifth step of the lamination method provided in Embodiment 3 of the present invention;

[0045] Figure 13 Shows a schematic diagram of the sixth step of the lamination method provided in Embodiment 3 of the present invention;

[0046] Figure 14 Shows a schematic diagram of the first step of the lamination method provided in Embodiment 4 of the present invention;

[0047] Figure 15 Shows a schematic diagram of the second step of the lamination method provided in Embodiment 4 of the present invention;

[0048] Figure 16 Shows a schematic diagram of the third step of the lamination method provided in Embodiment 4 of the present invention;

[0049] Figure 17 Shows a schematic diagram of the fourth step of the lamination method provided in Embodiment 4 of the present invention;

[0050] Figure 18 Shows a schematic diagram of the fifth step of the lamination method provided in Embodiment 4 of the present invention;

[0051] Figure 19 Shows a schematic diagram of the sixth step of the lamination method provided in Embodiment 4 of the present invention.

[0052] Explanation of reference numerals:

[0053] 10. Lamination table; 20. Pressing knife; 30. Diaphragm unwinding mechanism; 31. Diaphragm buffer structure; 40. Smoothing mechanism; 41. Smoothing roller; 50. Cutting mechanism; 60. Film clamping mechanism; 61. Clamping roller; 70. Unloading mechanism. Detailed implementation manners

[0054] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Embodiment 1

[0059] As Figures 1 to 19 shown, a specific embodiment of the laminating device includes: a laminating table 10, a separator unwinding mechanism 30, a pole piece loading mechanism, a flattening mechanism 40, and a cutting mechanism 50. A pressing knife 20 is provided on each laminating table 10, and the pole piece loading mechanism is correspondingly arranged with the laminating table 10. A plurality of laminating tables 10 are provided, the separator unwinding mechanism 30 is arranged above the plurality of laminating tables 10, and the separator unwinding mechanism 30 is adapted to reciprocate horizontally. The laminating table 10 is movably arranged, and the plurality of laminating tables 10 can move alternately to respectively correspond to the separator unwinding mechanism 30. The flattening mechanism 40 is located above the plurality of laminating tables 10 and below the separator unwinding mechanism 30, and the flattening mechanism 40 is movably arranged, and the flattening mechanism 40 can drive the separator to move horizontally. The cutting mechanism 50 can cut the separator downstream of the flattening mechanism 40.

[0060] It should be noted that above the above-mentioned plurality of lamination tables 10 refers to above the plurality of lamination tables 10 as a whole, that is, above the topmost lamination table 10 among the plurality of lamination tables 10. The above-mentioned plurality of lamination tables 10 can move alternately, which means that one lamination table 10 can move to another lamination table 10 to replace it. Specifically, when the topmost lamination table 10 finishes lamination, it can move downward, and the lamination table 10 below it can move to the top for lamination.

[0061] It should be further noted that when the upper lamination table 10 moves downward, it can move directly downward in the vertical direction; when the lower lamination table 10 moves upward, in order not to interfere with the upper lamination table 10, the upward-moving lamination table 10 can first move a certain distance in the horizontal direction for dislocation.

[0062] In this embodiment, as Figures 1 to 19 shown, there are two lamination tables 10, and the two lamination tables 10 are arranged at intervals in the vertical direction. Please refer to Figures 1 to 5 , lamination is performed on the upper lamination table 10. After the upper lamination table 10 finishes lamination, please refer to Figure 6 and Figure 7 , the upper lamination table 10 moves downward, and the lower lamination table 10 moves to the upper position. Or, please refer to Figures 8 to 12 , and Figures 14 to 17 , lamination is performed on the upper lamination table 10. After the lower lamination table 10 finishes blanking, it moves to the waiting station at the same height as the upper lamination table 10 to wait. After the upper lamination table 10 finishes lamination, please refer to Figure 13 , and Figure 18 and Figure 19 , the upper lamination table 10 moves downward, and the lamination table 10 at the waiting station moves horizontally to the lamination station. That is, the two lamination tables 10 can exchange positions in the vertical direction to perform lamination and blanking respectively.

[0063] Of course, the lamination table 10 can also be set to more, such as three, four, etc., as long as the lamination efficiency and blanking efficiency are adapted to each other.

[0064] It should be noted that the above-mentioned vertical direction is the up and down direction in Figures 1 to 19 , and the above-mentioned horizontal direction is the left and right direction in Figures 1 to 19 .

[0065] The stacked stack table 10 after stacking moves downward to the blanking station for blanking, and another stack table 10 moves to the stacking station for stacking. Therefore, the stacking device can perform blanking and stacking simultaneously, which can significantly shorten the blanking auxiliary time of stacking, that is, shorten the stop time during the stacking process, and improve the production efficiency of the battery cell.

[0066] It should be noted that the electrode sheet feeding mechanism can be correspondingly arranged with the stack table 10 at the uppermost position, that is, the electrode sheet feeding mechanism is correspondingly arranged with the stacking station.

[0067] As Figures 1 to 19 shown, the flattening mechanism 40 includes a pair of flattening rollers 41 arranged oppositely. The flattening rollers 41 are movably arranged in the transverse direction, and the diaphragm is allowed to pass between the pair of flattening rollers 41.

[0068] It should be noted that the flattening rollers 41 can be telescopically arranged in the longitudinal direction or can always be in the extended state. Specifically, please refer to Figure 4 and Figure 5 and Figure 11 and Figure 12 . After stacking the last layer of electrode sheets, a pair of flattening rollers 41 extend longitudinally and are respectively arranged on both sides of the diaphragm, and drive the diaphragm to move in the transverse direction; during the stacking process, the flattening rollers 41 do not need to be used, and the pair of flattening rollers 41 can be retracted longitudinally, which is convenient to use and ensures that the flattening rollers 41 do not interfere with the stacking process. Or, please refer to Figures 14 to 19 . A pair of flattening rollers 41 are always in the extended state, that is, the diaphragm is always between the pair of flattening rollers 41. When the diaphragm unwinding mechanism 30 moves back and forth in the transverse direction, the pair of flattening rollers 41 move synchronously with the diaphragm unwinding mechanism 30.

[0069] It should be further noted that when the last layer of electrode sheets is stacked, the diaphragm unwinding mechanism 30 stops moving, and the flattening mechanism 40 is used to lay the last layer of diaphragm on the last layer of electrode sheets.

[0070] As Figures 1 to 7 shown, the diaphragm unwinding mechanism 30 includes a diaphragm buffer structure 31, and the length of the diaphragm buffered in the diaphragm buffer structure 31 is adjustable. After the diaphragm is cut, the diaphragm buffer structure 31 retracts the diaphragm that extends beyond the flattening mechanism 40, avoiding waste of the diaphragm and improving the production quality.

[0071] In this embodiment, please refer to Figures 1 to 7 . The diaphragm buffer structure 31 includes a fixed roller and a moving roller. The diaphragm is wound around the fixed roller and the moving roller, and the moving roller can move in the transverse direction to adjust the buffering distance of the diaphragm.

[0072] As Figures 8 to 19As shown, the laminating device further includes a film clamping mechanism 60. The film clamping mechanism 60 can clamp the diaphragm above and close to the flattening mechanism 40. By arranging the film clamping mechanism 60 to clamp the diaphragm when the diaphragm does not need to be retracted, it is convenient for the diaphragm to be laminated again.

[0073] Of course, the film clamping mechanism 60 can also be arranged below the flattening mechanism 40. Correspondingly, the cutting position of the cutting mechanism 50 is located downstream of the film clamping mechanism 60.

[0074] As Figures 8 to 19 shown, the film clamping mechanism 60 includes a pair of clamping rollers 61 arranged oppositely. The clamping rollers 61 are movably arranged in the transverse direction. A diaphragm is suitable for being clamped between the pair of clamping rollers 61 to clamp and fix the diaphragm.

[0075] It should be noted that the clamping rollers 61 can be telescopically arranged in the longitudinal direction or can always be in the extended state. Specifically, please refer to Figure 11 and Figure 12 . After stacking the last layer of electrode plates, the pair of clamping rollers 61 extend longitudinally and clamp the diaphragm. The pair of clamping rollers 61 and the pair of flattening rollers 41 move together in the transverse direction to lay a layer of diaphragm, and the pair of clamping rollers 61 are used to clamp and fix the diaphragm after the diaphragm is laid; during the lamination process, the clamping rollers 61 do not need to be used, and the pair of clamping rollers 61 can be retracted longitudinally. The clamping rollers 61 are convenient to use and ensure that the clamping rollers 61 do not interfere with the lamination process. Or, please refer to Figures 14 to 19 . The pair of clamping rollers 61 are always in the extended state, that is, the diaphragm is located between the pair of flattening rollers 41 and the pair of clamping rollers 61 at the same time, and the pair of flattening rollers 41 and the pair of clamping rollers 61 move synchronously.

[0076] It should be noted that the diaphragm unwinding mechanism 30, the flattening mechanism 40, and the film clamping mechanism 60 are all arranged on the vertical plate. The fixed roller, the moving roller, the flattening roller 41, and the clamping roller 61 are all arranged perpendicular to the vertical plate. The above-mentioned longitudinal direction is Figures 1 to 19 the direction perpendicular to the drawing plane in

[0077] Of course, the flattening mechanism 40 can also be other mechanisms that can drive the diaphragm to move.

[0078] As Figures 1 to 19 shown, the laminating device further includes a blanking mechanism 70. The blanking mechanism 70 is correspondingly arranged with the laminating table 10 among several laminating tables 10 that is far from the diaphragm unwinding mechanism 30. That is, the laminating table 10 corresponding to the diaphragm unwinding mechanism 30 (the laminating table 10 at the top) is used for lamination and does not require blanking operation. Therefore, the blanking mechanism 70 does not need to be correspondingly arranged at this laminating table 10, and the laminating table 10 below it can be provided with a corresponding blanking mechanism 70 according to the blanking needs.

[0079] Specifically, in this embodiment, as Figures 1 to 7 shown, the blanking mechanism 70 is correspondingly arranged on the side of the stacking table 10 located below.

[0080] It should be noted that the blanking mechanism 70 is not arranged corresponding to a certain stacking table 10. The setting position of the blanking mechanism 70 is corresponding to the blanking station. The blanking mechanism 70 is used to blank the battery cells on the stacking table 10 at the blanking station.

[0081] In this embodiment, the blanking mechanism 70 is a blanking gripper.

[0082] Embodiment 2

[0083] The first specific implementation manner of the stacking method provided in this embodiment is applied to the stacking device of Embodiment 1. As Figures 1 to 7 shown, the stacking method includes:

[0084] As Figures 1 to 3 shown, one of several stacking tables 10 is moved to the stacking station for stacking. Among them, the diaphragm unwinding mechanism 30 reciprocates above the stacking station to lay the diaphragm on the stacking table 10 at the stacking station, and the positive or negative electrode sheet is stacked on the diaphragm through the electrode sheet feeding mechanism;

[0085] As Figure 4 and Figure 5 shown, after the last layer of electrode sheet is stacked on the stacking table 10 at the stacking station, the flattening mechanism 40 moves horizontally between the stacking table 10 and the diaphragm unwinding mechanism 30, and drives the diaphragm to move horizontally to lay the diaphragm on the last layer of electrode sheet to complete the stacking;

[0086] As Figure 6 and Figure 7 shown, the stacking table 10 at the stacking station is moved to the blanking station. At the same time, another stacking table 10 among several stacking tables 10 is moved to the stacking station, and the cutting mechanism 50 cuts the diaphragm downstream of the flattening mechanism 40;

[0087] The stacking table 10 at the blanking station performs blanking, and the pressing knife 20 on the stacking table 10 at the stacking station presses the diaphragm between the flattening mechanism 40 and the diaphragm unwinding mechanism 30 onto the stacking table 10 for stacking.

[0088] It is worth noting that according to the stacking process requirements, the negative electrode sheet needs to wrap the positive electrode sheet. Therefore, the last layer of electrode sheet stacked on the stacking table 10 at the stacking station should be the negative electrode sheet, and then the flattening mechanism 40 is used to cover a layer of diaphragm on the outer layer of the negative electrode sheet.

[0089] In this embodiment, as Figure 4As shown, after the last layer of electrode sheets is stacked on the stacking table 10 at the stacking station, a pair of flattening rollers 41 extend longitudinally, and the pair of flattening rollers 41 are disposed on both sides of the separator.

[0090] In this embodiment, as Figures 1 to 7 shown, there are two stacking tables 10. One stacking table 10 is located at the stacking station for stacking, and the other stacking table 10 is located at the blanking station for blanking.

[0091] By providing the flattening mechanism 40, the last layer of separator can be laid on the last layer of electrode sheets at the stacking station, and the separator between the flattening mechanism 40 and the separator unwinding mechanism 30 can be used as the first layer of separator for the next battery cell, improving the stacking efficiency.

[0092] It should be noted that the pressing knife 20 moves along with the stacking table 10. During the movement of the stacking table 10 at the stacking station towards the blanking station, the pressing knife 20 keeps pressing the battery cell on the stacking table 10 to ensure the overall accuracy of the battery cell during the position transfer of the stacking table 10.

[0093] In this embodiment, after the blanking of the stacking table 10 at the blanking station is completed, it moves a predetermined distance on the horizontal plane where it is located to move out of the blanking station. After that, the stacking table 10 moves one or more times in the vertical and horizontal directions and finally moves to the stacking station.

[0094] It should be noted that after the stacking table 10 at the blanking station moves out of the blanking station along the horizontal plane where it is located, the stacking table 10 at the stacking station drives the stacked battery cell to move to the blanking station for blanking. At the same time, the stacking table 10 moved out of the blanking station moves upward a certain distance in the vertical direction, then moves along the horizontal plane where it is located to the position directly below the stacking station, and then moves upward again in the vertical direction to the stacking station.

[0095] As Figure 6 and Figure 7 shown, after stacking is completed, the stacking table 10 at the stacking station moves to the blanking station and drives the separator to extend to the blanking station. After that, the cutting mechanism 50 cuts the separator at the position of the pressing knife 20 on the stacking table 10 near the blanking station. And after the cutting mechanism 50 cuts the separator, the separator buffer structure 31 retracts the separator exceeding the flattening mechanism 40 to make the cut end of the separator correspond to the stacking table 10 at the stacking station. Using the cutting mechanism 50 to cut the separator near the stacked battery cell can ensure that there is no excess separator on the stacked battery cell, guaranteeing the production quality of the battery cell. And the separator can be retracted to the greatest extent for reuse, avoiding waste.

[0096] It should be noted that the cut end of the diaphragm corresponds to the lamination table 10 at the lamination station, which means that the diaphragm is retracted so that the cut end of the diaphragm is located on the lamination table 10, and the pressing knife 20 can press the diaphragm. Specifically, the cut end of the diaphragm is aligned with the lamination position on the lamination table 10 to ensure the alignment of the initial diaphragm.

[0097] In this embodiment, when retracting the diaphragm, the moving roller moves away from the fixed roller in the transverse direction, increasing the buffer distance between the moving roller and the fixed roller.

[0098] It should be noted that the diaphragm is movably arranged between a pair of flattening rollers 41, that is, a pair of flattening rollers 41 do not completely clamp the diaphragm. When laying the last layer of the diaphragm between a pair of flattening rollers 41, the diaphragm can be flattened to ensure the flatness of the diaphragm; and after the diaphragm is cut, using the tension of the diaphragm and the diaphragm buffer structure 31, the diaphragm is retracted, and a pair of flattening rollers 41 can also flatten the diaphragm during the retraction process.

[0099] In this embodiment, during the lamination process, every time a layer of positive electrode sheet or negative electrode sheet is stacked on the lamination table 10 at the lamination station, the lamination table 10 moves downward by a preset distance, so that the electrode sheet feeding mechanism or the diaphragm unwinding mechanism 30 feeds materials at the same height each time. It should be noted that the two lamination tables 10 alternate positions in the vertical direction, and each lamination table 10 is at the same height every time it moves to the lamination station. Of course, each lamination table 10 is also at the same height every time it moves to the unloading station, which is convenient for unloading.

[0100] In this embodiment, when the lamination table 10 at the lamination station finishes lamination and moves downward, the lamination table 10 that has completed unloading at the unloading station can move towards the lamination station; when the lamination table 10 at the lamination station moves to the unloading station, the diaphragm can be cut and retracted, and when the lamination table 10 at the unloading station moves to the lamination station, the pressing knife 20 can be used to press the diaphragm onto the lamination table 10 at the lamination station; the lamination table 10 at the lamination station continues to stack the next battery cell, and at the same time, the lamination table 10 at the unloading station can perform unloading. Therefore, by performing the parallel processing of several action sequences, the lamination auxiliary time can be shortened to the greatest extent, and the production efficiency can be improved.

[0101] Embodiment 3

[0102] The second specific implementation manner of the lamination method provided in this embodiment is applied to the lamination device of Embodiment 1, as Figures 8 to 13 shown, the lamination method includes:

[0103] As Figure 8As shown, one of several lamination tables 10 is moved to the lamination station for lamination. Among them, the diaphragm unwinding mechanism 30 reciprocates above the lamination station to lay a diaphragm on the lamination table 10 at the lamination station, and a positive or negative electrode plate is stacked on the diaphragm through the electrode plate feeding mechanism;

[0104] As Figure 9 and Figure 10 shown, during the lamination process on the lamination table 10 at the lamination station, another lamination table 10 that has completed blanking at the blanking station is moved to the waiting station at the same height as the lamination station;

[0105] As Figure 11 and Figure 12 shown, after stacking the last layer of electrode plate on the lamination table 10 at the lamination station, the flattening mechanism 40 and the diaphragm clamping mechanism 60 move horizontally between the lamination table 10 and the diaphragm unwinding mechanism 30, and drive the diaphragm to move horizontally to lay a diaphragm on the last layer of electrode plate, completing the lamination;

[0106] As Figure 13 shown, the diaphragm clamping mechanism 60 clamps the diaphragm, and the cutting mechanism 50 cuts the diaphragm downstream of the flattening mechanism 40. The lamination table 10 at the lamination station moves downward to the blanking station. At the same time, the lamination table 10 at the waiting station moves to the lamination station;

[0107] The lamination table 10 at the blanking station performs blanking. The pressing knife 20 on the lamination table 10 at the lamination station presses the diaphragm between the flattening mechanism 40 and the diaphragm unwinding mechanism 30 onto the lamination table 10 for lamination.

[0108] In this embodiment, as Figure 11 shown, after stacking the last layer of electrode plate on the lamination table 10 at the lamination station, a pair of flattening rollers 41 and a pair of clamping rollers 61 extend simultaneously, and the pair of flattening rollers 41 and the pair of clamping rollers 61 are respectively arranged on both sides of the diaphragm.

[0109] It should be noted that when laying the last layer of diaphragm, the pair of clamping rollers 61 do not clamp the diaphragm. After laying the last layer of diaphragm and before the cutting mechanism 50 cuts the diaphragm, the pair of clamping rollers 61 clamp and fix the diaphragm. And the diaphragm is movably arranged between the pair of flattening rollers 41, that is, the pair of flattening rollers 41 do not completely clamp the diaphragm. When the pair of flattening rollers 41 lay the last layer of diaphragm, they can flatten the diaphragm to ensure the flatness of the diaphragm.

[0110] It is worth noting that according to the lamination process requirements, it is necessary to wrap the positive electrode plate with the negative electrode plate. Therefore, the last layer of electrode plate stacked on the lamination table 10 at the lamination station should be the negative electrode plate, and then the flattening mechanism 40 is used to cover a layer of diaphragm on the outer layer of the negative electrode plate.

[0111] By setting the flattening mechanism 40, the last layer of separator can be laid on the last layer of electrode sheets at the lamination station. Moreover, the separator between the flattening mechanism 40 and the separator unwinding mechanism 30 can serve as the first layer of separator for the next battery cell, improving the lamination efficiency.

[0112] It should be noted that the pressing knife 20 moves along with the lamination table 10. During the movement of the lamination table 10 at the lamination station towards the blanking station, the pressing knife 20 keeps pressing the battery cell on the lamination table 10 to ensure the overall accuracy of the battery cell during the position transfer of the lamination table 10.

[0113] When the lamination table 10 finishes blanking at the blanking station, the lamination table 10 first moves to the waiting station. When the lamination table 10 at the lamination station finishes lamination and moves towards the blanking station, the lamination table 10 at the waiting station simultaneously moves towards the lamination station. Therefore, a new lamination table 10 can be quickly replenished at the lamination station, shortening the production preparation time and further improving the production efficiency.

[0114] In this embodiment, the blanking station is located below the lamination station, and the waiting station is located in front of the lamination station and at the same height, making the movement of the lamination table 10 more convenient.

[0115] It should be noted that, please refer to Figure 12 , the flattening mechanism 40 and the film clamping mechanism 60 move to the left to lay the last layer of separator. After the separator is laid, the flattening mechanism 40 and the film clamping mechanism 60 remain in the left position, while at this time the separator unwinding mechanism 30 is in the right position; moreover, the waiting station is located on the right side of the lamination station, making it more convenient for the lamination table 10 to move from the waiting station to the lamination station.

[0116] As Figure 12 and Figure 13 shown, after lamination is completed, the film clamping mechanism 60 clamps and fixes the separator, and the cutting mechanism 50 cuts the separator at the position of the pressing knife 20 on the lamination table 10 near the lamination station. After that, the lamination table 10 at the lamination station can move downward to the blanking station.

[0117] It should be noted that by cutting the separator in the above manner, when the lamination table 10 at the waiting station moves to the lamination station, the cut end of the separator can be aligned with the lamination position on the lamination table 10, ensuring the alignment degree of the initial separator. Therefore, through the cooperation of the film clamping mechanism 60 and the cutting mechanism 50, the separator is cut at the lamination station and then the blanking process is carried out. After cutting, there is no need to retract the separator, further improving the production efficiency.

[0118] In this embodiment, during the lamination process, each time a layer of positive electrode sheet or negative electrode sheet is stacked on the lamination table 10 at the lamination station, the lamination table 10 moves downward by a preset distance, so that the electrode sheet feeding mechanism or the separator unwinding mechanism 30 feeds materials at the same height each time.

[0119] It should be noted that the initial heights of the lamination table 10 at the waiting station and the lamination table 10 at the lamination station are set to be equal. That is to say, the two lamination tables 10 alternate positions in the vertical direction, and each lamination table 10 is at the same height each time it moves to the lamination station. Of course, each lamination table 10 is also at the same height each time it moves to the discharging station, which is convenient for discharging.

[0120] In this embodiment, the lamination table 10 at the lamination station performs lamination, the lamination table 10 at the discharging station performs discharging, and the lamination table 10 at the discharging station moves to the waiting station after discharging is completed, which can be carried out synchronously; the lamination table 10 at the lamination station moves downward after lamination is completed, and the lamination table 10 at the waiting station moves towards the lamination station, which can also be carried out synchronously. Therefore, by processing the action timings of several actions in parallel, the auxiliary discharging time can be shortened to the greatest extent, and the production efficiency can be improved.

[0121] Embodiment 4

[0122] The third specific implementation manner of the lamination method provided in this embodiment is applied to the lamination device of Embodiment 1. As Figures 14 to 19 shown, the difference between this lamination method and the lamination method described in Embodiment 3 is that in this embodiment, the flattening mechanism 40 and the film clamping mechanism 60 are always in the extended state along the longitudinal direction, that is, a pair of flattening rollers 41 and a pair of clamping rollers 61 are always in the extended state. When the separator unwinding mechanism 30 reciprocates horizontally to lay the separator, the flattening mechanism 40 and the film clamping mechanism 60 move synchronously with the separator unwinding mechanism 30; after the electrode sheet feeding mechanism finishes stacking the last layer of electrode sheet, the separator unwinding mechanism 30 stops moving, and the flattening mechanism 40 and the film clamping mechanism 60 move together horizontally to lay the last layer of separator on the last layer of electrode sheet.

[0123] It should be noted that when the lamination table 10 at the waiting station moves to the lamination station, after the pressing knife 20 on the lamination table 10 presses the separator between the flattening mechanism 40 (film clamping mechanism 60) and the separator unwinding mechanism 30 onto the lamination table 10, the flattening mechanism 40 and the film clamping mechanism 60 can return to the initial position to re-clamp the separator to cooperate with the separator unwinding mechanism 30 to start the next lamination.

[0124] During the lamination process, a pair of flattening rollers 41 can be used to continuously flatten the separator, ensuring the flatness of the separator and thus ensuring the quality of the battery cell.

[0125] It should be noted that in Embodiments 1 to 4, the blanking station is located below the lamination station. In other alternative embodiments, the blanking station can also be located in other positions relative to the lamination station. For example, it can be on the side of the lamination station. When the lamination table 10 at the lamination station finishes lamination and moves towards the side to the blanking station, another lamination table 10 can move to the lamination station for the next lamination.

[0126] According to the above description, the present patent application has the following advantages:

[0127] 1. By alternately laminating and blanking using two lamination tables, lamination and blanking can be carried out synchronously, improving production efficiency;

[0128] 2. Combining the movement process of the lamination table with several blanking actions within the same time sequence segment shortens the auxiliary time for blanking and further improves efficiency.

[0129] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A lamination device, characterized in that, Comprising: Vertical plate; Laminating tables (10), which are movably arranged and there are several of them. Each laminating table (10) is provided with a pressing knife (20); Diaphragm unwinding mechanism (30), which is arranged on the vertical plate. The diaphragm unwinding mechanism (30) is adapted to reciprocate horizontally to lay the diaphragm on the laminating tables. Several laminating tables (10) can move alternately so that one of the several laminating tables (10) can move to the lower part of the diaphragm unwinding mechanism (30); Pole piece loading mechanism, which is correspondingly arranged with the laminating table (10); Smoothing mechanism (40), which is arranged on the vertical plate and is movably arranged. The smoothing mechanism (40) is located above the laminating table (10) and below the diaphragm unwinding mechanism (30). After stacking the last layer of pole pieces on the laminating table, the smoothing mechanism is adapted to drive the diaphragm to move horizontally to lay the diaphragm on the last layer of pole pieces; Cutting mechanism (50), which is adapted to cut the diaphragm downstream of the smoothing mechanism (40); Unloading mechanism (70), which is correspondingly arranged with the laminating table (10) among several laminating tables (10) that is far from the diaphragm unwinding mechanism (30); Wherein, the smoothing mechanism (40) includes a pair of smoothing rollers (41) arranged oppositely. The diaphragm is allowed to pass between the pair of smoothing rollers (41), and the diaphragm is movably arranged between the pair of smoothing rollers. The diaphragm unwinding mechanism (30) includes a diaphragm buffer structure (31). The length of the diaphragm cached in the diaphragm buffer structure (31) is adjustable, and the diaphragm buffer structure (31) retracts the diaphragm exceeding the smoothing mechanism (40); After lamination is completed, the laminating table at the lamination station moves to the unloading station and drives the diaphragm to extend to the unloading station. Then, the cutting mechanism cuts the diaphragm at the position of the pressing knife on the laminating table near the unloading station. And after the cutting mechanism cuts the diaphragm, the diaphragm buffer structure retracts the diaphragm exceeding the smoothing mechanism, retracts the diaphragm to make the cut end of the diaphragm located on the laminating table at the lamination station, and enables the pressing knife to press the diaphragm.

2. The lamination device according to claim 1, wherein The smoothing mechanism (40) is telescopically arranged longitudinally.

3. The lamination device according to claim 1, characterized in that, The laminating device further includes a film clamping mechanism (60), and the film clamping mechanism (60) is adapted to clamp the diaphragm above or below the smoothing mechanism (40) and close to the smoothing mechanism (40).

4. The lamination device according to claim 3, characterized in that, The film clamping mechanism (60) can move synchronously with the smoothing mechanism (40) horizontally.

5. The lamination device according to claim 4, characterized in that, The film clamping mechanism (60) is telescopically arranged longitudinally.

6. The laminating device according to claim 3, wherein The film clamping mechanism (60) includes a pair of clamping rollers (61) arranged oppositely, and the diaphragm is adapted to be clamped between the pair of clamping rollers (61).

7. A lamination method, applied to the lamination device described in any one of claims 1-6, characterized in that, Comprising: One of the several laminating tables (10) moves to the lamination station for lamination. Wherein, the diaphragm unwinding mechanism (30) reciprocates above the lamination station to lay the diaphragm on the laminating table (10) at the lamination station, and the positive electrode plate or the negative electrode plate is stacked on the diaphragm through the pole piece loading mechanism; After stacking the last layer of electrode sheets on the stacking table (10) located at the stacking station, the flattening mechanism (40) moves horizontally between the stacking table (10) and the diaphragm unwinding mechanism (30), and drives the diaphragm to move to lay the diaphragm on the last layer of electrode sheets, completing the stacking. The stacking table (10) located at the stacking station moves to the blanking station, and drives the diaphragm to extend to the blanking station. Another stacking table (10) among several stacking tables (10) moves to the stacking station. The cutting mechanism (50) cuts the diaphragm at the position of the pressing knife on the stacking table near the blanking station; the diaphragm buffer structure (31) retracts the diaphragm exceeding the flattening mechanism (40). The diaphragm moves between a pair of flattening rollers, and the diaphragm is retracted so that the cut end of the diaphragm is located on the stacking table at the stacking station, and the pressing knife can press the diaphragm. The blanking mechanism is used to unload the stacking table (10) located at the blanking station. The pressing knife (20) on the stacking table (10) located at the stacking station presses the diaphragm between the flattening mechanism (40) and the diaphragm unwinding mechanism (30) onto the stacking table (10) for stacking.

8. The lamination method according to claim 7, characterized in that, After the stacking table (10) located at the blanking station finishes unloading, it moves to the waiting station. When the stacking table (10) located at the stacking station finishes stacking and moves towards the blanking station, the stacking table (10) located at the waiting station moves towards the stacking station.

9. The laminating method according to claim 8, wherein, The blanking station is located below the stacking station, and the waiting station is located in front of the stacking station and is set at the same height.

10. The laminating method according to claim 7, wherein, After the stacking table (10) located at the blanking station finishes unloading, it moves a predetermined distance on the horizontal plane where the stacking table (10) is located to move out from the blanking station. After that, the stacking table (10) moves vertically and horizontally one or more times, and finally moves to the stacking station.

11. The lamination method according to claim 7, wherein After stacking is completed, the stacking table (10) located at the stacking station moves downward to the blanking station, and drives the diaphragm to extend to the blanking station. After that, the cutting mechanism (50) cuts the diaphragm.

12. The laminating method according to claim 11, wherein, After the cutting mechanism (50) cuts the diaphragm, the diaphragm buffer structure (31) retracts the diaphragm exceeding the flattening mechanism (40), so that the cut end of the diaphragm corresponds to the stacking table (10) located at the stacking station.

13. The laminating method according to claim 12, wherein The cutting mechanism (50) cuts the diaphragm at the position of the pressing knife (20) on the stacking table (10) near the blanking station.

14. The laminating method according to claim 7, characterized in that, After stacking is completed, the film clamping mechanism (60) above the flattening mechanism (40) clamps and fixes the diaphragm, the cutting mechanism (50) cuts the diaphragm, and then the stacking table (10) located at the stacking station moves towards the blanking station again.

15. The lamination method according to claim 7, wherein During the stacking process, every time a layer of positive electrode sheet or negative electrode sheet is stacked on the stacking table (10) at the stacking station, the stacking table (10) moves downward by a preset distance, so that the electrode sheet feeding mechanism or the diaphragm unwinding mechanism (30) feeds materials at the same height each time.

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