Membrane stacking device, lamination stacking device and battery production line

Abstract

The invention provides a membrane stacking device, a lamination device and a battery production line, and the membrane stacking device comprises a feeding mechanism which is used for providing a diaphragm; the cutting mechanism is arranged at the downstream position of the feeding mechanism, and the cutting mechanism is used for cutting the diaphragm; the film laying mechanism is arranged at the downstream position of the cutting mechanism and comprises a first rack, a winding roller, a first driving structure and a second driving structure, the first driving structure is used for driving the winding roller to move relative to the first rack in the horizontal direction, and the winding roller is provided with a first position close to the cutting mechanism and a second position away from the cutting mechanism; the winding roller has a film grabbing state and a loosening state, and the second driving structure drives the winding roller to rotate in the first direction or the second direction. According to the structure, the diaphragm can be laid in two directions only by arranging the feeding mechanism on the side part of the lamination table, so that the occupied space of the diaphragm stacking device in the horizontal direction is reduced, the additional vertical space is not occupied, and the overall size of the diaphragm stacking device is relatively small.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production equipment, and in particular to a film stacking device, a sheet stacking device and a battery production line. Background Art

[0002] Lamination is an important process in battery production. In the lamination process, the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked back and forth to form a battery cell. During lamination, the unrolled diaphragm needs to be laid on the lamination table. In the lamination process in the prior art, the diaphragm is usually laid in the following two ways. One is to set an unwinding mechanism on both sides of the side of the lamination table, and the diaphragm clamps clamp the diaphragm at the two unwinding mechanisms respectively, and realize the reciprocating laying of the diaphragm. Although this structure has a high film laying efficiency, the two unwinding mechanisms occupy a large space, making the overall volume of the lamination device larger. The other is to set the unwinding mechanism above the lamination table, and the unwinding mechanism unwinds the diaphragm toward the bottom. The diaphragm is laid in a "Z" shape under the reciprocating movement of the swing roller. This structure only needs to set one unwinding mechanism, but it occupies the space above the lamination table, which is not conducive to the layout flexibility of the lamination device. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art battery lamination process that the film lamination equipment occupies a large space, resulting in a large volume of the lamination device, thereby providing a film lamination device, a lamination device and a battery production line.

[0004] In order to solve the above problems, the present invention provides a film stacking device, including: a feeding mechanism, used to provide a diaphragm; a cutting mechanism, arranged at a downstream position of the feeding mechanism, the cutting mechanism is used to cut the diaphragm; a film laying mechanism, arranged at a downstream position of the cutting mechanism, the film laying mechanism includes a first frame, a roller, a first driving structure and a second driving structure, the first driving structure is used to drive the roller to move in a horizontal direction relative to the first frame, and make the roller have a first position close to the cutting mechanism and a second position away from the cutting mechanism, the roller has a film grabbing state and a loosening state, the second driving structure drives the roller to rotate in the first direction or the second direction, wherein the roller moves from the first position to the second position, or from the second position to the first position, so as to lay the diaphragm on the stacking table.

[0005] Optionally, the roller includes: a first mounting seat connected to the driving end of the second driving structure; a first clamping plate and a second clamping plate, both of which are movably arranged on the first mounting seat, and the first clamping plate and the second clamping plate can move closer to or away from each other.

[0006] Optionally, the roller also includes a first elastic member and a second elastic member, both of which are arranged on the first mounting seat, the first elastic member is suitable for applying an elastic force to the first clamping plate toward the second clamping plate, and the second elastic member is suitable for applying an elastic force to the second clamping plate toward the first clamping plate.

[0007] Optionally, the film stacking device also includes a clamping mechanism, which includes: a second mounting seat; a pushing top portion movably disposed on the second mounting seat; and a third driving structure disposed on the second mounting seat and used to drive the pushing top portion to extend or retract, wherein when the pushing top portion is in an extended state, the pushing top portion can open the first clamping plate and the second clamping plate to place the winding roller in a loosened state.

[0008] Optionally, the roller also includes a first slide plate and a second slide plate, both of which are movably arranged on the first mounting seat, the first clamping plate is arranged on the first slide plate, the first elastic member is connected between the first mounting seat and the first slide plate, the second clamping plate is arranged on the second slide plate, the second elastic member is connected between the first mounting seat and the second slide plate, the first slide plate is provided with a first convex portion, the second slide plate is provided with a second convex portion, the first convex portion and the second convex portion are arranged opposite to each other, and the end of the pushing top portion includes a conical portion, and when the pushing top portion is in an extended state, it can drive the first convex portion and the second convex portion to move away from each other.

[0009] Optionally, the clamping mechanism is arranged at the first position; or, there are two clamping mechanisms, which are arranged at the first position and the second position respectively.

[0010] Optionally, there are two film laying mechanisms, and in the direction perpendicular to the flow of the diaphragm, the two film laying mechanisms are respectively located on both sides of the feeding mechanism, and in the flow direction along the diaphragm, the rollers of the two film laying mechanisms are arranged opposite to each other, and the film laying mechanism also includes a fourth drive structure, and the fourth drive structure is used to drive the rollers to move in the vertical direction relative to the first frame.

[0011] Optionally, the film stacking device further comprises a film clamping mechanism, which is disposed upstream of the cutting mechanism and can clamp the diaphragm or release the diaphragm.

[0012] Optionally, the film clamping mechanism includes a third mounting seat, a third clamping plate, a fourth clamping plate and a fifth driving structure, at least one of the third clamping plate and the fourth clamping plate is movably arranged on the third mounting seat, and the fifth driving structure is used to drive the third clamping plate and the fourth clamping plate to move closer to or away from each other.

[0013] Optionally, the cutting mechanism includes a fourth mounting seat, a cutting strip and a sixth driving structure, the fourth mounting seat is movably arranged on the third mounting seat, the cutting strip is arranged on the fourth mounting seat and is located at a downstream position of the third clamping plate and the fourth clamping plate, and the sixth driving structure drives the fourth mounting seat to move in a vertical direction.

[0014] Optionally, at least one end of the cutting strip is provided with a seventh driving structure, which is disposed on the fourth mounting seat and is used to apply a pulling force toward the outside to the end of the cutting strip.

[0015] Optionally, the film stacking device further comprises a deviation correcting mechanism, and the deviation correcting mechanism is arranged between the feeding mechanism and the film clamping mechanism.

[0016] Optionally, in the flow direction along the diaphragm, the correcting mechanism includes a passing roller, a detection structure and a correcting roller, and the correcting mechanism also includes an eighth driving structure, which is used to drive the cutting mechanism, the film clamping mechanism, and the correcting roller to move synchronously in the flow direction perpendicular to the diaphragm.

[0017] Optionally, the film stacking device also includes a second frame, a fifth mounting seat and a ninth driving structure, the fifth mounting seat is movably arranged on the second frame, the ninth driving structure is used to drive the fifth mounting seat to move upstream or downstream along the direction of diaphragm flow relative to the second frame, and the cutting mechanism, the film clamping mechanism and the correction mechanism are all arranged on the fifth mounting seat.

[0018] Optionally, the film stacking device further comprises a slitting mechanism, which is arranged at a downstream position of the cutting mechanism, and is used to slit the membrane into a plurality of strips.

[0019] Optionally, the slitting mechanism includes a sixth mounting seat, a seventh mounting seat, a blade, a tenth driving structure and an adjustment structure, the seventh mounting seat is movably arranged on the sixth mounting seat, the tenth driving structure is arranged on the seventh mounting seat, the blade is arranged on the driving end of the tenth driving structure, the tenth driving structure can drive the blade to extend or retract, and the adjustment structure is used to adjust the relative position of the seventh mounting seat relative to the sixth mounting seat.

[0020] Optionally, in the flow direction along the diaphragm, the feeding mechanism includes an unwinding roller, a pressure roller, an electrostatic elimination structure, a tensioning structure and a buffer structure.

[0021] Optionally, the feeding mechanism further includes an eighth mounting seat and an eleventh driving structure, the unwinding roller is movably disposed on the eighth mounting seat, and the eleventh driving structure drives the unwinding roller to move along its axial direction.

[0022] The present invention also provides a stacking device, comprising: a stacking table; a film stacking device, the film stacking device is the above-mentioned film stacking device, and the film laying mechanism is arranged on the side of the stacking table; a film making mechanism, used to provide positive electrode sheets and negative electrode sheets; and a conveying mechanism, used to convey the positive electrode sheets and negative electrode sheets to the stacking table.

[0023] The present application also provides a battery production line, comprising the above-mentioned stacking device.

[0024] The present invention has the following advantages:

[0025] By using the technical solution of the present invention, when laying the diaphragm, the first drive structure drives the roller to move to the first position, the roller is in a film-grasping state and fixes the diaphragm, and the second drive structure drives the roller to rotate in the first direction to cache the diaphragm. Then the first drive structure drives the roller to move from the first position to the second position, and from the second position to the first position. During the movement, the second drive structure drives the roller to rotate in the second direction, thereby releasing the cached diaphragm, laying the diaphragm on the stacking table, and being able to lay the diaphragm from two directions (the direction from the first position to the second position, and the direction from the second position to the first position). In the above structure, only one feeding mechanism can be set on the side of the stacking table, so that the diaphragm can be laid in two directions, which reduces the space occupied by the stacking device in the horizontal direction, and does not occupy additional vertical space, so that the overall volume of the stacking device is small. Therefore, the technical solution of the present invention solves the defect that the stacking equipment occupies a large space and the stacking device is large in volume in the battery stacking process in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of a film stacking device according to the present invention is shown;

[0028] Figure 2 Shows Figure 1 The enlarged schematic diagram at A in the middle;

[0029] Figure 3 Shows Figure 1 A schematic diagram of the structure of the feeding mechanism of the middle film stacking device;

[0030] Figure 4 Shows Figure 3 A schematic diagram of the structure of the unwinding roller, the eighth mounting seat and the eleventh driving structure of the middle feeding mechanism;

[0031] Figure 5 Shows Figure 1 A schematic diagram of the structure of the deviation correction mechanism, film clamping mechanism, cutting mechanism and slitting mechanism of the middle film stacking device;

[0032] Figure 6 Shows Figure 5 A schematic diagram of the structure of the detection structure of the deviation correction mechanism;

[0033] Figure 7 Shows Figure 5 A schematic diagram of the structure of the film clamping mechanism and the cutting mechanism from a side perspective;

[0034] Figure 8 Shows Figure 5 A schematic structural diagram of the film clamping mechanism and the cutting mechanism from another side perspective;

[0035] Fig. 9 Shows Figure 5 Structural diagram of the middle cutting mechanism;

[0036] Fig.10 Shows Figure 1 A schematic diagram of the structure of a film laying mechanism of a middle film stacking device;

[0037] Fig.11 Shows Fig.10 A schematic diagram of the structure of the winding roller of the mid-film laying structure;

[0038] Fig.12 Shows Figure 1 Schematic diagram of the cooperation between the clamping mechanism and the winding roller of the middle film stacking device;

[0039] Fig.13 Shows Fig.12 The enlarged schematic diagram of point B in the middle;

[0040] Fig.14 Shows Figure 1 A schematic diagram of the structure of two film laying mechanisms in the middle film stacking device;

[0041] Fig.15 The structural schematic diagram of the lamination table is shown;

[0042] Fig.16 Shows Figure 1 Schematic diagram of step 1 of the first method of laying the diaphragm in the middle stack membrane device;

[0043] Fig.17 Shows Figure 1 Schematic diagram of step 2 of the first membrane laying method of the middle stack membrane device;

[0044] Fig.18 Shows Figure 1 Schematic diagram of step 3 of the first membrane laying method of the middle stack membrane device;

[0045] Fig.19 Shows Figure 1 Schematic diagram of step 4 of the first membrane laying method of the middle stack membrane device;

[0046] Fig. 20 Shows Figure 1Schematic diagram of step 5 of the first membrane laying method of the middle stack membrane device;

[0047] Fig.21 Shows Figure 1 Schematic diagram of step 1 of the second method of laying the diaphragm of the middle stacked membrane device;

[0048] Fig. 22 Shows Figure 1 Schematic diagram of step 2 of the second method of laying the diaphragm in the middle stacked membrane device;

[0049] Fig.23 Shows Figure 1 Schematic diagram of step 3 of the second method of laying the diaphragm of the middle stacked membrane device;

[0050] Fig.24 Shows Figure 1 Schematic diagram of step 4 of the second method of laying the diaphragm in the middle stacked membrane device;

[0051] Fig.25 Shows Figure 1 Schematic diagram of step 5 of the second method of laying the diaphragm in the middle stacked membrane device;

[0052] Fig.26 Shows Figure 1 Schematic diagram of step six of the second method of laying the diaphragm in the middle stacked membrane device;

[0053] Fig. 27 Shows Figure 1 Schematic diagram of step seven of the second method of laying the diaphragm in the middle stacked membrane device;

[0054] Fig.28 Shows Figure 1 Schematic diagram of step eight of the second method of laying the diaphragm in the middle stack membrane device.

[0055] Description of reference numerals:

[0056] 1. diaphragm; 2. laminating table; 10. feeding mechanism; 11. unwinding roller; 12. pressing roller; 13. static elimination structure; 14. tensioning structure; 15. buffer structure; 16. eighth mounting seat; 17. eleventh driving structure; 20. cutting mechanism; 21. fourth mounting seat; 22. cutting strip; 23. sixth driving structure; 24. seventh driving structure; 30. film laying mechanism; 31. first frame; 32. winding roller; 3201. first winding roller; 3202. second winding roller; 321. first mounting seat; 322. first clamping plate; 323. second clamping plate; 324. first elastic member; 325. second elastic member; 326. first slide plate; 3261. first convex portion; 327. second slide plate; 327 1. Second convex portion; 33. First driving structure; 34. Second driving structure; 35. Fourth driving structure; 40. Clamping mechanism; 41. Second mounting seat; 42. Pushing top portion; 421. Conical portion; 43. Third driving structure; 50. Film clamping mechanism; 51. Third mounting seat; 52. Third clamping plate; 53. Fourth clamping plate; 54. Fifth driving structure; 60. Deviation correction mechanism; 61. Over roller; 62. Detection structure; 63. Deviation correction roller; 64. Eighth driving structure; 70. Second frame; 80. Fifth mounting seat; 90. Ninth driving structure; 100. Cutting mechanism; 101. Sixth mounting seat; 102. Seventh mounting seat; 103. Blade; 104. Tenth driving structure; 105. Adjustment structure. DETAILED DESCRIPTION

[0057] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0061] like Figures 1 to 27 As shown, an embodiment of the film stacking device according to the present application includes a feeding mechanism 10, a cutting mechanism 20 and a film laying mechanism 30. Among them, the feeding mechanism 10 is used to provide the diaphragm 1. The cutting mechanism 20 is arranged at the downstream position of the feeding mechanism 10, and the cutting mechanism 20 is used to cut the diaphragm 1. The film laying mechanism 30 is arranged at the downstream position of the cutting mechanism 20, and the film laying mechanism 30 includes a first frame 31, a roller 32, a first driving structure 33 and a second driving structure 34. The first driving structure 33 is used to drive the roller 32 to move in a horizontal direction relative to the first frame 31, and make the roller 32 have a first position close to the cutting mechanism 20 and a second position away from the cutting mechanism 20. The roller 32 has a film grabbing state and a loosening state, and the second driving structure 34 drives the roller 32 to rotate in the first direction or the second direction.

[0062] Furthermore, the winding roller 32 moves from the first position to the second position, or from the second position to the first position, so as to lay the diaphragm 1 on the lamination table 2 .

[0063] By using the technical solution of this embodiment, when laying the diaphragm, the first driving structure 33 drives the roller 32 to move to the first position, the roller 32 is in the film-grasping state and fixes the diaphragm 1, and the second driving structure 34 drives the roller 32 to rotate in the first direction to cache the diaphragm 1. Then the first driving structure 33 drives the roller 32 to move from the first position to the second position, and from the second position to the first position. During the movement, the second driving structure 34 drives the roller 32 to rotate in the second direction, thereby releasing the cached diaphragm 1, so that the diaphragm 1 is laid on the stacking table 2, and the diaphragm 1 can be laid from two directions (the direction from the first position to the second position, and the direction from the second position to the first position). In the above structure, only one feeding mechanism 10 can be set on the side of the stacking table 2, so that the diaphragm 1 can be laid in two directions, which reduces the space occupied by the stacking device in the horizontal direction, and does not occupy additional vertical space, so that the overall volume of the stacking device is small. Therefore, the technical solution of this embodiment solves the problem that in the prior art battery lamination process, the film lamination equipment occupies a large space, resulting in a large volume of the lamination device.

[0064] Combination Figure 1 and Figure 2 It can be seen that in the film stacking device of this embodiment, when laying the membrane 1, it must pass through the feeding mechanism 10, the deviation correction mechanism 60, the film clamping mechanism 50, the cutting mechanism 20, the slitting mechanism 100 and the film laying mechanism 30 in sequence. In order to facilitate understanding of the technical solution of this embodiment, the following first introduces each mechanism in detail according to the order in which the membrane 1 passes during the circulation process.

[0065] 1. Feeding

[0066] like Figures 1 to 3 As shown, along the flow direction of the diaphragm 1 , the feeding mechanism 10 includes a unwinding roller 11 , a pressure roller 12 , an electrostatic elimination structure 13 , a tensioning structure 14 and a buffer structure 15 .

[0067] In this embodiment, the function of the feeding mechanism 10 is to unwind the diaphragm 1 and provide it to the downstream process. Figure 4 It can be seen that the unwinding roller 11 is driven to rotate by a motor. When unwinding, the membrane roll is placed on the unwinding roller 11, and after the motor is started, the unwinding roller 11 can be driven to rotate, so that the unwinding roller 11 unwinds the membrane roll.

[0068] Optionally, the unwinding roller 11 and the motor shaft of the motor may be directly connected or indirectly connected. Figure 4 In the technical solution, the motor shaft of the motor is connected to the unwinding roller 11 through a synchronous belt, that is, indirectly connected.

[0069] Optionally, the unwinding roller 11 is an inflatable shaft, and the diaphragm roll can be clamped or released by inflating or deflating the unwinding roller 11.

[0070] from Figure 3 It can be seen that the pressure roller 12 is arranged at the downstream position of the unwinding roller 11, and its function is to press the diaphragm 1, that is, to tension the diaphragm 1. Further, the pressure roller 12 can be connected to the driving end of the linear drive mechanism, that is, the position of the pressure roller 12 can be adjusted, thereby adjusting the tension degree.

[0071] In this embodiment, the function of the static elimination structure 13 is to eliminate static electricity on the surface of the diaphragm 1. Figure 3 It can be seen that the static elimination structures 13 are arranged in two separated groups, which are respectively located on both sides of the diaphragm 1 . The two static elimination structures 13 can eliminate static electricity on both the front and back sides of the diaphragm 1 .

[0072] In this embodiment, the tensioning structure 14 is used to tension the diaphragm 1. Specifically, the tensioning structure 14 includes a swing rod, the middle part of which is connected to the motor shaft of the motor, and tensioning rollers are provided at both ends of the swing rod, and the diaphragm 1 passes through the two tensioning rollers from both sides. When the swing rod swings, the two tensioning rollers can be driven to swing, thereby achieving a tensioning effect on the diaphragm 1, and the tensioning degree of the tensioning rollers can be controlled by controlling the swing angle of the swing rod.

[0073] like Figure 3 As shown, a buffer structure 15 is provided downstream of the tensioning structure 14. The function of the buffer structure 15 is to buffer the diaphragm 1 when the downstream production rhythm slows down, and to release the buffered diaphragm 1 when the downstream production rhythm speeds up. Specifically, the buffer structure 15 includes a buffer roller, which is connected to the driving end of a linear drive mechanism and can move. In this embodiment, the buffer roller can move along Figure 3 Move left and right as shown.

[0074] Specifically, when the diaphragm 1 needs to be cached, the cache roller moves away from the downstream, that is, toward Figure 3 When the diaphragm 1 needs to be released, the buffer roller moves in the downstream direction, i.e. towards Figure 3 The left side of the diagram is shown. This allows the feed and feed of the film stacking device to match.

[0075] like Figure 4 As shown, in the technical solution of this embodiment, the feeding mechanism 10 also includes an eighth mounting seat 16 and an eleventh driving structure 17, the unwinding roller 11 is movably arranged on the eighth mounting seat 16, and the eleventh driving structure 17 drives the unwinding roller 11 to move along its axial direction.

[0076] Specifically, the eleventh driving structure 17 is used to correct the first deviation of the unwound diaphragm 1. The mounting frame of the unwinding roller 11 can be slidably mounted on the eighth mounting seat 16. Specifically, the two are connected by a slide rail and a slider. The sliding direction of the unwinding roller 11 is consistent with the axial direction of the unwinding roller 11, that is, the unwinding roller 11 can be on the eighth mounting seat 16, along the Figure 4 The eleventh driving structure 17 drives the unwinding roller 11 to slide relative to the eighth mounting seat 16.

[0077] Furthermore, the eleventh driving structure 17 is specifically a motor, the motor shaft of the motor is connected to the rotating shaft of the lead screw nut, and the slider of the lead screw nut is connected to the mounting frame of the unwinding roller 11. Therefore, when the motor is forward or reverse, the slider of the lead screw nut can drive the unwinding roller 11 to slide relative to the eighth mounting seat 16.

[0078] Optionally, the eleventh driving structure 17 may also be a linear driving mechanism such as a driving cylinder.

[0079] Furthermore, a sensor is provided on the circulation path of the diaphragm 1, and the sensor detects the degree of deviation of the diaphragm 1. When the sensor detects that the degree of deviation of the diaphragm 1 exceeds a threshold value, the control system starts the eleventh driving structure 17, thereby driving the unwinding roller 11 to move on the eighth mounting seat 16, until the sensor detects that the position of the diaphragm 1 is returned to the correct position, and the deviation is completely corrected.

[0080] Optionally, the sensor in this embodiment is arranged between two static elimination structures 13 .

[0081] In addition, the feeding mechanism 10 also includes a plurality of rollers, which play a role in limiting the flow path and reversing of the membrane 1. When the membrane 1 passes through the last roller, it is fed to the subsequent mechanism.

[0082] 2. Correction

[0083] After the membrane 1 is unwound, it needs to be corrected again to ensure the accuracy of the subsequent laying of the membrane 1. That is, after the membrane 1 flows out of the feeding mechanism 10, it needs to enter the correcting mechanism 60, which is arranged between the feeding mechanism 10 and the film clamping mechanism 50.

[0084] like Figure 5 As shown, in the technical solution of this embodiment, in the flow direction along the diaphragm 1, the correcting mechanism 60 includes a passing roller 61, a detection structure 62 and a correcting roller 63, and the correcting mechanism 60 also includes an eighth driving structure 64, and the eighth driving structure 64 is used to drive the cutting mechanism 20, the film clamping mechanism 50, and the correcting roller 63 to move synchronously along the flow direction perpendicular to the diaphragm 1.

[0085] from Figure 5It can be seen that the function of the roller 61 is to adjust the direction of the flow of the diaphragm 1 into the deviation correction mechanism 60 .

[0086] The function of the detection structure 62 is to detect the degree of displacement of the diaphragm 1. Its specific structure is as follows: Figure 6 As shown, the detection structure 62 includes a mounting plate, and the side of the mounting plate has a notch. Two sensors are respectively arranged on the upper and lower sides of the notch. One of the two sensors is a transmitting end, and the other is a receiving end (for example, emitting light and receiving light). When the diaphragm 1 flows through the notch, it can block part of the sensor. When the degree of displacement of the diaphragm 1 is different, the area of ​​the blocked sensor is also different. The sensor determines whether the displacement of the diaphragm 1 exceeds the threshold by detecting the blocking area of ​​the diaphragm 1.

[0087] Of course, the detection structure 62 may also adopt other conventional detection sensors.

[0088] like Figure 6 As shown, the function of the deflection correction roller 63 is to adjust the position of the diaphragm 1 so that it returns to the normal position from the offset position. The diaphragm passes through the deflection correction roller 63, and the eighth driving structure 64 can drive the deflection correction roller 63 to move, so that the deflection correction roller 63 drives the diaphragm 1 to move through friction force to achieve position adjustment.

[0089] Furthermore, the eighth driving structure 64 is a linear driving mechanism such as a linear motor and a driving cylinder. The eighth driving structure 64 can drive the correcting roller 63 to move along a flow direction perpendicular to the diaphragm, that is, drive the correcting roller 63 to move along the direction of its axis.

[0090] When the detection structure 62 detects that the deviation degree of the diaphragm 1 exceeds the threshold value, the control system starts the eighth driving structure 64, so that the correction roller 63 moves along its axial direction until the detection structure 62 detects that the position of the diaphragm 1 has returned to the correct position, and the correction is complete.

[0091] Further, from Figure 5 It can be seen that there are two deflection correction rollers 63 arranged in parallel, and the relative positions of the two deflection correction rollers 63 are fixed and move synchronously. Figure 2 It can be seen that the diaphragm 1 passes through the upper and lower sides of the two deflection correction rollers 63. Such an arrangement enables the deflection correction roller 63 to exert a greater friction force on the diaphragm 1, ensuring that when the deflection correction roller 63 moves, the diaphragm 1 can be driven to move by the greater friction force, thereby achieving a deflection correction effect.

[0092] Of course, when the surface friction of the correction roller 63 is large, only one correction roller 63 may be provided. Alternatively, more than two correction rollers 63 may be provided, and the diaphragm 1 passes through each correction roller 63 in an up-and-down staggered manner in turn, thereby applying a greater friction force.

[0093] In addition, in order to ensure that the diaphragm 1 is also corrected at the downstream position of the correcting roller 63, in this embodiment, the eighth driving structure 64 needs to drive the correcting roller 63, the downstream film clamping mechanism 50 and the cutting mechanism 20 (along the flow direction perpendicular to the diaphragm 1) to move synchronously to ensure the consistency of the position of the diaphragm 1 upstream and downstream.

[0094] In some embodiments not shown, if the unwinding accuracy of the diaphragm 1 is high and its position accuracy can be guaranteed, it is also a feasible embodiment not to provide the deviation correction mechanism 60.

[0095] After passing through the deviation correction roller 63, the diaphragm flows into the subsequent mechanism.

[0096] 3. Film clamping and cutting

[0097] After the diaphragm 1 flows out of the deviation correction mechanism 60, it needs to pass through the film clamping mechanism 50 and the cutting mechanism 20 before film laying. The film clamping mechanism 50 is arranged at the upstream position of the cutting mechanism 20, and the film clamping mechanism 50 can clamp the diaphragm 1 or release the diaphragm 1. The cutting mechanism 20 can cut the diaphragm 1.

[0098] The function of the film clamping mechanism 50 is to clamp the diaphragm 1, thereby fixing the diaphragm 1. The function of the cutting mechanism 20 is to cut the diaphragm 1. The timing of clamping and releasing the diaphragm 1 by the film clamping mechanism 50, and the timing of cutting the diaphragm 1 by the cutting mechanism 20 will be described in detail below during the laying process of the diaphragm 1. This section first introduces the structures of the film clamping mechanism 50 and the cutting mechanism 20.

[0099] like Figure 7 and Figure 8 As shown, in the technical solution of this embodiment, the film clamping mechanism 50 includes a third mounting seat 51, a third clamping plate 52, a fourth clamping plate 53 and a fifth driving structure 54. At least one of the third clamping plate 52 and the fourth clamping plate 53 is movably arranged on the third mounting seat 51, and the fifth driving structure 54 is used to drive the third clamping plate 52 and the fourth clamping plate 53 to move closer to or away from each other.

[0100] Specifically, the third clamping plate 52 and the fourth clamping plate 53 are both flat plate structures, and the two are arranged opposite to each other. When the third clamping plate 52 and the fourth clamping plate 53 move closer to each other, the diaphragm 1 can be clamped, and when the third clamping plate 52 and the fourth clamping plate 53 move away from each other, the diaphragm can be loosened.

[0101] The third clamping plate 52 and the fourth clamping plate 53 may be arranged on the third mounting seat 51 in the following ways: 1. The third clamping plate 52 and the fourth clamping plate 53 are both movably arranged on the third mounting seat 51; 2. The third clamping plate 52 is movably arranged on the third mounting seat 51, and the fourth clamping plate 53 is fixedly arranged on the third mounting seat 51; 3. The third clamping plate 52 is fixedly arranged on the third mounting seat 51, and the fourth clamping plate 53 is movably arranged on the third mounting seat 51. The second arrangement is adopted in this embodiment.

[0102] from Figure 7 It can be seen that the fifth driving structure 54 is a linear driving structure, which can be a linear motor, a driving cylinder, etc. The fifth driving structure 54 is arranged on the third mounting seat 51 and is located below the third clamping plate 52. The driving end of the fifth driving structure 54 is connected to the third clamping plate 52. Those skilled in the art can understand that when the driving end of the fifth driving structure 54 is extended, the third clamping plate 52 can be driven to move toward the fourth clamping plate 53, that is, the diaphragm 1 is clamped. When the driving end of the fifth driving structure 54 is retracted, the third clamping plate 52 can be driven to move away from the fourth clamping plate 53, that is, the diaphragm 1 is released.

[0103] like Figure 7 and Figure 8 As shown, in the technical solution of this embodiment, the cutting mechanism 20 includes a fourth mounting seat 21, a cutting strip 22 and a sixth driving structure 23. The fourth mounting seat 21 is movably arranged on the third mounting seat 51, and the cutting strip 22 is arranged on the fourth mounting seat 21 and is located at a downstream position of the third clamping plate 52 and the fourth clamping plate 53. The sixth driving structure 23 drives the fourth mounting seat 21 to move in the vertical direction.

[0104] Specifically, the fourth mounting seat 21 can be mounted on the third mounting seat 51 through a guide rail structure. Figure 8 It can be seen that the sixth drive structure 23 is a linear drive structure, which can be a linear motor, a drive cylinder, etc. The drive end of the sixth drive structure 23 is connected to the fourth mounting seat 21. Those skilled in the art can understand that when the drive end of the sixth drive structure 23 is extended, the fourth mounting seat 21 can be driven to move upward relative to the third mounting seat 51, and when the drive end of the sixth drive structure 23 is retracted, the fourth mounting seat 21 can be driven to move downward relative to the third mounting seat 51. Since the cutting strip 22 is arranged on the fourth mounting seat 21, the sixth drive structure 23 can drive the cutting strip 22 to move in the up and down directions. During the movement, the cutting strip 22 passes through the diaphragm 1 to achieve cutting of the diaphragm 1.

[0105] Optionally, the cutting strip 22 may be a metal wire, which generates heat when energized and cuts the diaphragm 1 after passing through the diaphragm 1 .

[0106] Further, from Figure 7 and Figure 8 It can also be seen that the third mounting seat 51 is a plate-shaped structure. The fourth mounting seat 21 is arranged on the first surface of the third mounting seat 51, and the sixth driving structure 23 is arranged on the first surface of the fourth mounting seat 21. Extension plates are arranged on both sides of the fourth mounting seat 21, and the ends of the extension plates are wound from the side of the third mounting seat 51 to the front side of the second surface of the third mounting seat 51, and the two ends of the cutting strip 22 are respectively connected to the two extension plates. The fifth driving structure is arranged on the second surface of the third mounting seat 51.

[0107] Such arrangement enables the fifth driving structure 54 and the sixth driving structure 23 to be located on two surfaces of the third mounting seat 51 respectively, and their movement travels do not interfere with each other, and can ensure that the cutting strip 22 is located downstream of the third clamping plate 52 and the fourth clamping plate 53 .

[0108] In this embodiment, the first surface of the third mounting seat 51 is a surface facing the upstream direction, and the second surface of the third mounting seat 51 is a surface facing the downstream direction.

[0109] like Figure 7 and Figure 8 As shown, in the technical solution of this embodiment, a seventh driving structure 24 is provided at least at one end of the cutting strip 22 . The seventh driving structure 24 is provided on the fourth mounting seat 21 and is used to apply a pulling force toward the outside to the end of the cutting strip 22 .

[0110] Specifically, at high temperatures, the cutting strip 22 may expand, causing it to be not a straight line. At this time, cutting the diaphragm 1 will result in an uneven cut, affecting the quality of the battery cell. By setting the seventh drive structure 24, the seventh drive structure 24 can apply an outward pulling force to the end of the cutting strip 22, so that the cutting strip 22 can always remain in a tensioned state at different temperatures, thereby ensuring the cutting quality of the diaphragm 1.

[0111] from Figure 7 and Figure 8 It can be seen that one end of the cutting strip 22 is fixed on one of the extension plates, and the seventh driving structure 24 can be optionally a guide rail cylinder, which is arranged on another extension plate, and the other end of the cutting strip 22 is connected to the slider of the guide rail cylinder. The guide rail cylinder always applies an outward pulling force to the end of the cutting strip 22 to keep it in a straight line state, and the applied pulling force is preferably not to damage the cutting strip 22.

[0112] Of course, the seventh driving structure 24 can also be other linear driving mechanisms such as a linear motor and a driving cylinder.

[0113] In an embodiment not shown, a seventh driving structure 24 may also be provided on both extension plates. In this case, both ends of the cutting strip 22 are respectively connected to the driving ends of the two seventh driving structures 24. The pulling forces applied by the two seventh driving structures 24 are in opposite directions, further ensuring that the cutting strip 22 is in a tensioned state.

[0114] 4. Cutting

[0115] like Figure 5 and Fig. 9 As shown, in the technical solution of this embodiment, the film stacking device further includes a slitting mechanism 100, which is arranged at a downstream position of the cutting mechanism 20, and the slitting mechanism 100 is used to slit the diaphragm 1 into multiple strips.

[0116] Specifically, from Fig.15 It can be seen that there are two rows of stacking positions on the stacking table 2, so the stacking device in this embodiment can lay diaphragms for two rows of battery cells at a time, and the laying efficiency is higher. Before laying the diaphragm 1, the diaphragm 1 needs to be cut into two rows by the cutting mechanism 100, and the two rows of diaphragms 1 are laid on the two rows of pole pieces respectively.

[0117] It should be noted that in some embodiments not shown, if there is only one row of stacking positions on the stacking table, that is, only one row of pole pieces needs to be laid with the diaphragm 1, then there is no need to cut the diaphragm 1, that is, not providing the cutting mechanism 100 is also a feasible implementation method.

[0118] like Fig. 9 As shown, in the technical solution of this embodiment, the slitting mechanism 100 includes a sixth mounting seat 101, a seventh mounting seat 102, a blade 103, a tenth driving structure 104 and an adjusting structure 105. The seventh mounting seat 102 is movably arranged on the sixth mounting seat 101, the tenth driving structure 104 is arranged on the seventh mounting seat 102, and the blade 103 is arranged on the driving end of the tenth driving structure 104. The tenth driving structure 104 can drive the blade 103 to extend or retract, and the adjusting structure 105 is used to adjust the relative position of the seventh mounting seat 102 relative to the sixth mounting seat 101.

[0119] Specifically, the sixth mounting seat 101 is a plate-shaped structure, and the seventh mounting seat 102 is a plate-shaped structure. The seventh mounting seat 102 is movably arranged on the sixth mounting seat 101, and the moving direction is horizontal and along the flow direction perpendicular to the diaphragm 1. The movement of the seventh mounting seat 102 can be guided by structures such as guide rails, slide rails, linear grooves and protrusions.

[0120] Optionally, the adjustment structure 105 is a micrometer head, which is fixedly arranged on the sixth mounting seat 101, and the adjustment head of the micrometer head is connected to the side of the seventh mounting seat 102. The operator can control the head of the micrometer head to extend or retract by rotating the micrometer head, so as to achieve fine adjustment of the horizontal position of the seventh mounting seat 102. When the seventh mounting seat 102 moves, the tenth driving structure 104 and the blade 103 are driven to move synchronously, so as to achieve fine adjustment of the horizontal position of the blade 103, thereby ensuring the slitting accuracy of the diaphragm 1.

[0121] Further, from Fig. 9 It can be seen that the tenth driving structure 104 is optionally a driving cylinder, which is fixedly arranged on the seventh mounting seat 102, and the push rod of the driving cylinder is connected to the blade 103 through an "L"-shaped plate. Those skilled in the art can understand that when the push rod of the driving cylinder is extended, the blade 103 is extended, and the diaphragm 1 can be cut at this time, and when the push rod of the driving cylinder is retracted, the blade 103 is retracted, and the diaphragm 1 is not cut at this time.

[0122] Furthermore, a protective cover is also provided on the sixth mounting seat 101. When the blade 103 is in the retracted state, the blade 103 is located in the protective cover, thereby preventing the operator from being cut.

[0123] Furthermore, the blade 103 in this embodiment is set to one, and in some embodiments not shown, when it is necessary to lay diaphragms for more columns of pole pieces, the number of blades 103 can be increased accordingly.

[0124] After the diaphragm 1 is cut, the next process can be carried out, that is, the diaphragm 1 is laid on the lamination table 2 by the film laying mechanism 30 .

[0125] like Figure 5 As shown, in the technical solution of this embodiment, the film stacking device further includes a second frame 70, a fifth mounting seat 80 and a ninth driving structure 90. The fifth mounting seat 80 is movably arranged on the second frame 70, and the ninth driving structure 90 is used to drive the fifth mounting seat 80 to move upstream or downstream along the flow direction of the diaphragm 1 relative to the second frame. And the slitting mechanism 100 (when the mechanism is provided), the cutting mechanism 20, the film clamping mechanism 50 and the deviation correction mechanism 60 are all arranged on the fifth mounting seat 80.

[0126] Specifically, the ninth driving structure 90 may be a driving cylinder, the fifth mounting seat 80 may be a mounting plate, and the driving cylinder may drive the mounting plate to move along the flow direction of the pole piece, including moving in the upstream direction and moving in the downstream direction. The movement of the mounting plate may drive the slitting mechanism 100, the cutting mechanism 20, the film clamping mechanism 50 and the deviation correction mechanism 60 to move synchronously.

[0127] The ninth driving structure 90 and the fifth mounting seat 80 mainly have the following three functions:

[0128] 1. The film clamping mechanism 50 clamps the diaphragm 1 and then transports it downstream for a certain distance, so that the winding roller 32 can grab the diaphragm 1;

[0129] 2. Move the cutting mechanism 20 to the edge of the lamination table 2 to cut the diaphragm 1;

[0130] 3. Make sure that each mechanism on the fifth mounting seat 80 has a certain distance from the stacking table 2 to provide a buffer position.

[0131] The above three functions will be described in detail in the following steps of laying the diaphragm 1.

[0132] 5. Film laying mechanism

[0133] like Figure 1 and Figure 2 ,as well as Fig.10 As shown, first, as described above, the film laying mechanism 30 is arranged at the downstream position of the cutting mechanism 20, that is, the slitting mechanism 100, and the film laying mechanism 30 includes a first frame 31, a winding roller 32, a first driving structure 33 and a second driving structure 34. The first driving structure 33 is used to drive the winding roller 32 to move in the horizontal direction relative to the first frame 31, and to make the winding roller 32 have a first position close to the cutting mechanism 20 and a second position away from the cutting mechanism 20. The winding roller 32 has a film grabbing state and a loosening state, and the second driving structure 34 drives the winding roller 32 to rotate in the first direction or the second direction.

[0134] Specifically, the roller 32 can rotate along its own axis, and the second driving structure 34 can drive the roller 32 to rotate in a first direction or a second direction. The first direction and the second direction refer to two opposite directions, including the first direction being clockwise and the second direction being counterclockwise, and including the first direction being counterclockwise and the second direction being clockwise.

[0135] Those skilled in the art can understand that when the winding roller 32 rotates in the first direction, the diaphragm 1 can be wound on the winding roller 32, that is, the diaphragm 1 is cached. When the winding roller 32 rotates in the second direction, the cached diaphragm 1 can be released and laid on the lamination table 2.

[0136] like Figure 1 and Fig.10As shown, the first driving structure 33 can drive the roller 32 to translate in the horizontal direction, that is, drive the roller 32 to move in the direction close to the cutting mechanism 20, and drive the roller 32 to move in the direction away from the cutting mechanism 20. The moving path of the roller 32 has two extreme positions, that is, the first position and the second position. When the roller 32 is in the first position, the roller 32 is close to the cutting mechanism 20, and when the roller 32 is in the second position, the roller 32 is away from the cutting mechanism 20. The stacking table 2 is located between the first position and the second position, that is, whether the roller 32 moves from the first position to the second position or from the second position to the first position, it can completely pass above the stacking table 2.

[0137] Optionally, the first driving structure 33 and the second driving structure 34 may both be linear driving mechanisms such as linear motors and driving cylinders.

[0138] Furthermore, the roller 32 has a film-grasping state and a loosening state, wherein the film-grasping state refers to fixing the diaphragm 1 on the roller 32, and the loosening state refers to loosening the diaphragm 1 from the roller 32. The roller 32 can be switched between the film-grasping state and the loosening state by providing a structure that can be opened and closed, such as a clip or an adsorption hole.

[0139] The following introduces two ways of laying film on roller 32:

[0140] Method 1: The roller 32 stops at the first position, the roller 32 is in a film clamping state and grabs the diaphragm 1, and the roller 32 rotates in the first direction to cache the diaphragm 1 until the diaphragm to be laid is cached; then the roller 32 starts to reciprocate between the first position and the second position, and at the same time the roller 32 rotates in the second direction to release the cached diaphragm 1 and lay the diaphragm 1 on the stacking table 2; until the roller 32 has released the cached diaphragm 1, the roller 32 returns to the first position to cache the diaphragm 1 again.

[0141] Method 2: The roller 32 is in a film-grasping state at the first position and grabs the diaphragm 1, and then the roller 32 moves from the first position toward the second position, and at the same time the roller 32 rotates in the first direction to cache the diaphragm 1, that is, the first layer of diaphragm 1 is laid while the diaphragm 1 is cached; after the roller moves to the second position, that is, after the first layer of diaphragm 1 is laid, the roller 32 rotates in the second direction, and at the same time the roller 32 moves in the first direction, that is, the cached diaphragm 1 is released; according to the amount of diaphragm 1 cached by the roller 32, the roller 32 can end a reciprocating laying after moving to the first position, or it can complete a laying after moving back and forth a certain number of times; after the roller 32 releases the cached diaphragm 1, the roller 32 returns to the first position to grab the diaphragm 1 again.

[0142] For ease of description, the two methods are referred to as film laying method 1 and film laying method 2 below. Those skilled in the art can understand that no matter which method is used, when only the feeding mechanism 10 is provided on one side of the laminating table 2, the roller can achieve the effect of reciprocating diaphragm laying. Therefore, while reducing the occupied space of the laminating equipment, efficient diaphragm laying can still be ensured.

[0143] The present embodiment adopts the film laying method 1, which has the advantage that the position of the winding roller 32 for winding and caching the diaphragm 1 is close to the correction mechanism 60, so the diaphragm 1 can be wound and cached after completing the correction mechanism 60, thereby ensuring the winding accuracy of the diaphragm 1 on the winding roller 32, thereby ensuring the accuracy of subsequently laying the diaphragm 1 on the stacking table 1.

[0144] like Fig.11 As shown, in the technical solution of this embodiment, the roller 32 includes a first mounting seat 321, a first clamping plate 322 and a second clamping plate 323. The first mounting seat 321 is connected to the driving end of the second driving structure 34. The first clamping plate 322 and the second clamping plate 323 are both movably arranged on the first mounting seat 321, and the first clamping plate 322 and the second clamping plate 323 can move closer to each other or move away from each other.

[0145] Specifically, the first mounting seat 321 is connected to the driving end of the second driving structure 34. The second driving structure 34 can be a motor. When the motor shaft of the motor rotates, it can drive the first mounting seat 321 to rotate, thereby driving the first clamping plate 322 and the second clamping plate 323 to rotate. When the motor rotates forward or reverse, it can drive the roller 32 to rotate in the first direction or in the second direction.

[0146] from Fig.10 and Fig.11 It can be seen that the first clamping plate 322 and the second clamping plate 323 are both long strip structures, the first ends of the first clamping plate 322 and the second clamping plate 323 are both movably arranged on the first mounting seat 321, and the second ends of the first clamping plate 322 and the second clamping plate 323 extend horizontally in a direction away from the first mounting seat 321. Furthermore, the surfaces of the first clamping plate 322 and the second clamping plate 323 facing each other are both planes, so that the two can clamp the diaphragm, and the surfaces of the first clamping plate 322 and the second clamping plate 323 facing each other are both arc-shaped surfaces, so that the two can form a round roller structure after closing, so as to facilitate the winding of the buffer diaphragm 1.

[0147] Furthermore, the movement direction of the first clamping plate 322 and the second clamping plate 323 on the first mounting seat 321 is the direction of approaching each other and moving away from each other. The movement of the first clamping plate 322 and the second clamping plate 323 on the first mounting seat 321 can be achieved by structures such as guide rails and slide rails. Those skilled in the art can understand that when the first clamping plate 322 and the second clamping plate 323 move closer to each other, the two can clamp the diaphragm 1, so that the roller 32 is in a film-grasping state. When the first clamping plate 322 and the second clamping plate 323 move away from each other, the two can release the diaphragm 1, so that the roller 32 is in a released state.

[0148] like Fig.11 As shown, in the technical solution of this embodiment, the roller 32 further includes a first elastic member 324 and a second elastic member 325. The first elastic member 324 and the second elastic member 325 are both arranged on the first mounting seat 321, and the first elastic member 324 is suitable for applying an elastic force on the first clamping plate 322 toward the second clamping plate 323, and the second elastic member 325 is suitable for applying an elastic force on the second clamping plate 323 toward the first clamping plate 322.

[0149] That is, the first elastic member 324 and the second elastic member 325 apply elastic forces toward each other to the first clamping plate 322 and the second clamping plate 323 respectively. When the first clamping plate 322 and the second clamping plate 323 are not subjected to other external forces, the first elastic member 324 and the second elastic member 325 make the first clamping plate 322 and the second clamping plate 323 in a closed state. When the first clamping plate 322 and the second clamping plate 323 are subjected to an external force that moves away from each other, the first clamping plate 322 and the second clamping plate 323 can be stretched open, and the first elastic member 324 and the second elastic member 325 are compressed. The external force can be achieved by a driving mechanism or by a push-up structure. When the external force disappears, the first elastic member 324 and the second elastic member 325 release the elastic force, so that the first clamping plate 322 and the second clamping plate 323 are in a closed state again.

[0150] Optionally, the first elastic member 324 and the second elastic member 325 may be springs.

[0151] In some embodiments not shown, the first clamping plate 322 and the second clamping plate 323 may be connected to a linear drive mechanism such as a cylinder (or a linear drive mechanism is connected between the two), and the moving positions of the first clamping plate 322 and the second clamping plate 323 may be controlled by the linear drive. In this embodiment, the first elastic member 324 and the second elastic member 325 may not be provided.

[0152] like Figure 1 , Fig.12 and Fig.13As shown, in the technical solution of this embodiment, the film stacking device also includes a clamping mechanism 40, which includes a second mounting seat 41, a pushing top portion 42 and a third driving structure 43. Among them, the pushing top portion 42 is movably arranged on the second mounting seat 41. The third driving structure 43 is arranged on the second mounting seat 41 and is used to drive the pushing top portion 42 to extend or retract. Further, when the pushing top portion 42 is in the extended state, the pushing top portion 42 can open the first clamping plate 322 and the second clamping plate 323 to make the winding roller 32 in a loose state.

[0153] It should be noted that the clamping mechanism 40 refers to the first clamping plate 322 and the second clamping plate 323 being opened when the roller 32 moves to the clamping mechanism 40, so that the roller 32 is in a loose state. Correspondingly, when the roller 32 does not move to the clamping mechanism 40, the first elastic member 324 and the second elastic member 325 keep the roller 32 in a closed state, that is, a film-grasping state.

[0154] In the above-mentioned embodiment where the first clamping plate 322 and the second clamping plate 323 are connected to the linear drive mechanism, the clamping mechanism 40 may not be provided.

[0155] like Fig.12 As shown, further, the second mounting seat 41 includes a supporting column, which can be arranged at a position where the first clamping plate 322 and the second clamping plate 323 are opened when needed. The third driving structure 43 can be a driving cylinder, which is arranged at the top position of the supporting column, and the pushing part 42 is a block structure and is connected to the driving end of the driving cylinder.

[0156] Those skilled in the art can understand that when the roller 32 moves to the clamping mechanism 40 and the first clamping plate 322 and the second clamping plate 323 need to be opened, the third driving structure 43 drives the pushing portion 42 to extend, thereby opening the first clamping plate 322 and the second clamping plate 323. When the first clamping plate 322 and the second clamping plate 323 need to be closed, the third driving structure 43 drives the pushing portion 42 to retract, and at this time, the first elastic member 324 and the second elastic member 325 release their elastic force, so that the first clamping plate 322 and the second clamping plate 323 are in a closed state again.

[0157] like Fig.12 and Fig.13 As shown, in the technical solution of this embodiment, the roller 32 further includes a first slide plate 326 and a second slide plate 327, and the first slide plate 326 and the second slide plate 327 are both movably arranged on the first mounting seat 321. The first clamping plate 322 is arranged on the first slide plate 326, the first elastic member 324 is connected between the first mounting seat 321 and the first slide plate 326, the second clamping plate 323 is arranged on the second slide plate 327, and the second elastic member 325 is connected between the first mounting seat 321 and the second slide plate 327.

[0158] Furthermore, a first protrusion 3261 is provided on the first slide plate 326, and a second protrusion 3271 is provided on the second slide plate 327. The first protrusion 3261 and the second protrusion 3271 are arranged opposite to each other. The end of the pushing part 42 includes a tapered part 421. When the pushing part 42 is in an extended state, it can drive the first protrusion 3261 and the second protrusion 3271 to move away from each other.

[0159] Specifically, the moving direction of the first slide plate 326 and the second slide plate 327 is the direction in which the first clamping plate 322 and the second clamping plate 323 approach and move away from each other. The movement of the first slide plate 326 and the second slide plate 327 can be achieved by structures such as guide rails and slide rails. The first clamping plate 322 is fixedly arranged on the first slide plate 326, and the second clamping plate 323 is fixedly arranged on the second slide plate 327. Therefore, when the first slide plate 326 and the second slide plate 327 move, the first clamping plate 322 and the second clamping plate 323 can be driven to move relative to each other.

[0160] from Fig.11 and Fig.12 It can be seen that the first elastic member 324 is disposed on the side of the first slide plate 326 away from the second slide plate 327, that is, the first elastic member 324 applies an elastic force on the first slide plate 326 in the direction of the second slide plate 327. The second elastic member 325 is disposed on the side of the second slide plate 327 away from the first slide plate 326, that is, the second elastic member 325 applies an elastic force on the second slide plate 327 in the direction of the first slide plate 326.

[0161] from Fig.13 It can be seen that the first slide plate 326 is provided with a first convex portion 3261, and the second slide plate 327 is provided with a second convex portion 3271. The first convex portion 3261 and the second convex portion 3271 are arranged opposite to each other, and the distance between the first convex portion 3261 and the second convex portion 3271 is smaller than the width of the push portion 42. When the push portion 42 extends, its conical portion 421 first extends between the first convex portion 3261 and the second convex portion 3271. As the push portion 42 continues to extend forward, the widest position of the push portion 42 pushes the first convex portion 3261 and the second convex portion 3271 away from each other, thereby driving the first slide plate 326 and the second slide plate 327 to move away from each other, so that the first clamping plate 322 and the second clamping plate 323 are stretched open, that is, the winding roller 32 is in a loose state. When the push portion 42 retracts, the elastic force of the first elastic member 324 and the second elastic member 325 causes the first slide plate 326 and the second slide plate 327 to move closer to each other until the first clamping plate 322 and the second clamping plate 323 are closed, that is, the winding roller 32 is in a film-grabbing state.

[0162] Optionally, the first convex portion 3261 and the second convex portion 3271 are rollers. When the push-top portion 42 is extended, the rollers and the inclined surface of the conical portion 421, as well as the two side surfaces of the push-top portion 42 have a small friction force, ensuring that the push-top portion 42 can smoothly push open the first slide plate 326 and the second slide plate 327.

[0163] Furthermore, the advantage of the above structure is that the push-up portion 42 does not need to be inserted into the gap between the first clamping plate 322 and the second clamping plate 323 to open the clamping, but the first clamping plate 322 and the second clamping plate 323 are opened indirectly by opening the first slide plate 326 and the second slide plate 327. Therefore, there is no need to set a gap or avoidance groove on the first clamping plate 322 and the second clamping plate 323, ensuring that the contact surface between the first clamping plate 322 and the second clamping plate 323 is a complete plane, thereby ensuring the degree of clamping of the diaphragm 1.

[0164] As for the setting position of the clamping mechanism 40, it is mentioned above that the clamping mechanism 40 can be set at the position where the roller 32 needs to be in the open position, which is described in detail below.

[0165] First, if Figure 1 and Figure 2 As shown, since the roller 32 needs to grab the diaphragm 1 at the first position, the first clamping plate 322 and the second clamping plate 323 need to be in an open state before the diaphragm 1 can be extended to the position between the first clamping plate 322 and the second clamping plate 323. Therefore, a clamping mechanism 40 needs to be set at the first position. In addition, when the buffered diaphragm 1 on the roller 32 is laid at the first position (the diaphragm 1 with an odd number of times the length of the stacking platform 2 is cached in the first film laying method, and the diaphragm 1 with an even number of times the length of the stacking platform 2 is cached in the second film laying method), the roller 32 needs to be in a loose state at the first position after laying is completed, so as to loosen the tail of the diaphragm.

[0166] Secondly, when the buffer membrane 1 on the roller 32 is laid at the second position (the membrane 1 of the even-numbered stacking platform 2 length is cached in the first film laying method, and the membrane 1 of the odd-numbered stacking platform 2 length is cached in the second film laying method), a clamping mechanism 40 is also required to be arranged at the second position. The clamping mechanism 40 makes the roller 32 in a loose state at the second position after laying, thereby loosening the membrane tail. In this embodiment, two clamping mechanisms 40 are arranged, and the two clamping mechanisms 40 are arranged at the first position and the second position respectively.

[0167] Of course, those skilled in the art can add a clamping mechanism 40 at a position where the roller 32 needs to be in a loosened state according to actual needs.

[0168] Furthermore, in this embodiment, there are two film laying mechanisms 30, and in the direction perpendicular to the flow of the diaphragm 1, the two film laying mechanisms 30 are respectively located on both sides of the feeding mechanism 10. In addition, in the flow direction of the diaphragm 1, the rollers 32 of the two film laying mechanisms 30 are arranged opposite to each other, and the film laying mechanism 30 also includes a fourth driving structure 35, which is used to drive the rollers 32 to move in the vertical direction relative to the first frame 31.

[0169] Specifically, the film laying efficiency of the film laying device can be further improved by providing two film laying mechanisms 30. The two film laying mechanisms 30 have substantially the same structure and are arranged in mirror symmetry along the laminating table 2. The extension directions of the rollers 32 of the two film laying mechanisms 30 are opposite and symmetrical.

[0170] Among the two rollers 32 of the two film laying mechanisms 30, at the same time, one is laying the diaphragm 1 and the other is caching the diaphragm 1. The two rollers 32 are staggered to lay the diaphragm 1 and cache the diaphragm 1, so that a roller 32 is laying the diaphragm 1 at every moment, which greatly improves the laying efficiency of the diaphragm 1.

[0171] Furthermore, in the case where two film laying mechanisms 30 are provided, a fourth driving structure 35 is also required to be provided, and the fourth driving structure 35 can drive the winding roller 32 to move in the vertical direction. The function of the fourth driving structure 35 is to make the two winding rollers 32 staggered in the vertical direction, so that the two rollers will not conflict with each other during the movement between the first position and the second position.

[0172] Optionally, the fourth driving structure 35 may be a linear driving mechanism such as a linear motor or a driving cylinder.

[0173] When two film laying mechanisms 30 are provided, how the two cooperate to lay the diaphragm 1 will be described in detail in the following film laying steps.

[0174] In addition, in some embodiments not shown, it is also a feasible embodiment to only provide one film laying mechanism 30. Alternatively, in the present embodiment where two film laying mechanisms 30 are provided, it is also a feasible manner to only operate one of the film laying mechanisms 30 (i.e., the other film laying mechanism 30 is not started), which is equivalent to providing one film laying mechanism 30.

[0175] The above is the specific structure of the film laying device of this embodiment. The following is a detailed description of how to use the film laying device of this embodiment to lay the diaphragm.

[0176] 6. Film laying steps

[0177] As described above, the film laying device in this embodiment can use one roller 32 for film laying (set up one film laying mechanism 30, or set up two film laying mechanisms 30 but only start one), or can use two rollers 32 to collaboratively lay the film, which are introduced below respectively.

[0178] 1. Single roll 32 film laying (taking film laying method 1 as an example)

[0179] Step 1: Fig.16 As shown, the winding roller 32 moves to the first position, and the film clamping mechanism 50 and the cutting mechanism 20 move upstream synchronously for a distance through the ninth driving structure 90 and make way for the winding roller 32; the first clamping plate 322 and the second clamping plate 323 are opened by the clamping mechanism 40, and the film clamping mechanism 50 clamps the diaphragm 1, and moves downward for a distance through the ninth driving structure 90 to feed the end of the diaphragm 1 between the first clamping plate 322 and the second clamping plate 323, and then the first clamping plate 322 and the second clamping plate 323 are closed to clamp the diaphragm 1; the film clamping mechanism 50 releases the diaphragm, and then the winding roller 32 rotates in the first direction to cache the diaphragm 1 on the winding roller 32 until the diaphragm 1 of the preset length is cached;

[0180] Step 2: Fig.17 As shown, after the diaphragm 1 is cached, the roller 32 moves toward the second position and rotates in the second direction while moving, that is, releasing the cached diaphragm 1 and laying the diaphragm on the lamination table; until the first layer of diaphragm is laid;

[0181] Step 3: Fig.18 As shown, after the roller 32 lays the first layer of diaphragm, the film clamping mechanism 50 and the cutting mechanism 20 move synchronously downstream for a distance through the ninth driving structure 90 until the cutting mechanism 20 is at the edge of the laminating table 2; then the film clamping mechanism 50 clamps the diaphragm 1, and the cutting mechanism 20 cuts the diaphragm;

[0182] Step 4: Fig.19 As shown, the film clamping mechanism 50 and the cutting mechanism 20 move upstream synchronously for a distance through the ninth driving structure 90, and at the same time, the winding roller 32 moves from the second position to the first position and rotates in the second direction while moving, that is, releasing the buffered diaphragm 1 and laying the diaphragm on the laminating table. The number of reciprocating movements of the winding roller 32 can be selected according to the length of the buffered diaphragm 1;

[0183] Step 5: Fig. 20 As shown, after the roller 32 has laid the diaphragm, the first clamping plate 322 and the second clamping plate 323 are opened by the clamping mechanism 40, and the roller 32 loosens the tail of the diaphragm; then the roller 32 moves back to the front side of the clamping mechanism 50 and the cutting mechanism 20, ready to re-buffer the diaphragm (refer to the content of step one).

[0184] By repeating the above steps 1 to 5 repeatedly, high-speed reciprocating diaphragm 1 laying can be achieved.

[0185] It should be noted that if the above-mentioned film laying method 2 is adopted, the film laying steps are basically the same as the above-mentioned steps, with the difference that: at the end of step 1, the roller 32 rotates in the first direction, and at the same time the roller 32 also moves toward the second position. In step 2, the roller 32 buffers the diaphragm 1, thereby completing the laying of the first layer of diaphragm 1.

[0186] 2. Double roll 32 film laying

[0187] First, it should be noted that, in order to facilitate the distinction between the two rollers 32 , the roller 32 in one of the film laying mechanisms 30 is referred to as a first roller 3201 , and the roller 32 in the other film laying mechanism 30 is referred to as a second roller 3202 .

[0188] Step 1: Fig.21 As shown, the first roller 3201 moves to the first position, and the film clamping mechanism 50 and the cutting mechanism 20 move upstream synchronously for a distance through the ninth driving structure 90 and make way for the first roller 3201; the first clamping plate 322 and the second clamping plate 323 of the first roller 3201 are opened by the clamping mechanism 40, and the film clamping mechanism 50 clamps the diaphragm 1 and moves downstream for a distance through the ninth driving structure 90 to feed the end of the diaphragm 1 between the first clamping plate 322 and the second clamping plate 323, and then the first clamping plate 322 and the second clamping plate 323 are closed, so that the first roller 3201 clamps the diaphragm 1; the film clamping mechanism 50 releases the diaphragm, and then the first roller 3201 rotates in the first direction to cache the diaphragm 1 on the first roller 3201 until the preset length of the diaphragm 1 is cached; at this time, the second roller 3202 is waiting at the upper position to cache the diaphragm 1, and does not affect the horizontal movement of the first roller 3201;

[0189] Step 2: Fig. 22 As shown, after the first roller 3201 has cached the membrane 1, it moves toward the second position and rotates in the second direction while moving, that is, releasing the cached membrane 1 and laying the membrane on the laminating table; until the first layer of membrane is laid;

[0190] Step 3: Fig.23 As shown, after the first roll 3201 lays the first layer of diaphragm, the film clamping mechanism 50 and the cutting mechanism 20 move synchronously downstream for a distance through the ninth driving structure 90 until the cutting mechanism 20 is at the edge of the laminating table 2; then the film clamping mechanism 50 clamps the diaphragm 1, and the cutting mechanism 20 cuts the diaphragm;

[0191] Step 4: Fig.24As shown, the film clamping mechanism 50 and the cutting mechanism 20 move synchronously upstream for a distance through the ninth driving structure 90, and at the same time, the first roller 3201 moves from the second position to the first position and rotates in the second direction while moving, that is, releasing the cached diaphragm 1 and laying the diaphragm on the stacking table; according to the length of the cached diaphragm 1, the number of reciprocating movements of the first roller 3201 can be selected; at the same time, the second roller 3202 moves to the front side of the film clamping mechanism 50 and the cutting mechanism 20 to start caching the diaphragm (the caching method is the same as the caching method of the first roller 3201 in step one, which will not be repeated).

[0192] Step 5: Fig.25 As shown, after the first roller 3201 has laid the diaphragm 1, the first clamping plate 322 and the second clamping plate 323 are opened by the clamping mechanism 40, and the first roller 3201 releases the tail of the diaphragm; and the first roller 3201 moves to the upper side to wait for the next buffering of the diaphragm 1; at this time, the second roller 3202 has buffered the diaphragm 1 and is ready to lay the diaphragm 1;

[0193] Step 6: Fig.26 As shown, after the second roller 3202 has cached the membrane 1, it moves toward the second position and rotates in the second direction while moving, that is, releasing the cached membrane 1 and laying the membrane on the laminating table; until the first layer of membrane is laid;

[0194] Step 7: Fig. 27 As shown, after the second roll 3202 lays the first layer of the membrane 1, the film clamping mechanism 50 and the cutting mechanism 20 move synchronously downstream for a distance through the ninth driving structure 90 until the cutting mechanism 20 is at the edge of the laminating table 2; then the film clamping mechanism 50 clamps the membrane 1, and the cutting mechanism 20 cuts the membrane;

[0195] Step 8: Fig.28 As shown, the film clamping mechanism 50 and the cutting mechanism 20 move synchronously upstream for a distance through the ninth driving structure 90. At the same time, the second roller 3202 moves from the second position to the first position and rotates in the second direction while moving, that is, the cached diaphragm 1 is released and the diaphragm is laid on the stacking table; according to the length of the cached diaphragm 1, the number of reciprocating movements of the second roller 3202 can be selected; at the same time, the first roller 3201 moves to the front side of the film clamping mechanism 50 and the cutting mechanism 20 to start caching the diaphragm (the content of step one of the caching method will not be repeated).

[0196] By reciprocating the above steps 1 to 8, the dual rollers 32 can cooperate with the high-speed reciprocating diaphragm 1 to lay the diaphragm 1, ensuring that the rollers 32 are laying the diaphragm 1 at any time, and the film laying efficiency is greatly improved.

[0197] It should be noted that if the first roller 3201 and the second roller 3202 adopt the above-mentioned film laying method 2, the film laying steps are basically the same as the above-mentioned steps, with the difference being: at the end of step one, the first roller 3201 rotates in the first direction, and at the same time the first roller 3201 also moves toward the second position, and in step two, the first roller 3201 buffers the diaphragm 1 while completing the laying of the first layer of diaphragm 1; at the end of step six, the second roller 3202 rotates in the first direction, and at the same time the second roller 3202 also moves toward the second position, and in step seven, the second roller 3202 buffers the diaphragm 1 while completing the laying of the first layer of diaphragm 1.

[0198] The present application also provides a lamination device. According to an embodiment of the lamination device of the present application, the lamination device includes a lamination table 2, the above-mentioned film lamination device, a film making mechanism and a conveying mechanism.

[0199] from Fig.15 It can be seen that a lamination position is arranged on the top of the lamination platform 2, and a positive electrode sheet pressing knife and a negative electrode sheet pressing knife are arranged on the side of the lamination position.

[0200] Furthermore, the feeding mechanism 10, the deviation correcting mechanism 60, the film clamping mechanism 50, the cutting mechanism 20 and the slitting mechanism 100 of the film stacking device are located at the end of the stacking platform 2. The two film laying mechanisms 30 are located at both sides of the stacking platform 2 respectively.

[0201] In this embodiment, only one feeding mechanism 10 is provided on one side of the lamination table 2 .

[0202] The film-making mechanism is used for processing the positive electrode sheets and the negative electrode sheets, and the transport mechanism can transport the positive electrode sheets and the negative electrode sheets back and forth to the lamination table.

[0203] Furthermore, the working process of the stacking device is as follows: the transport mechanism transports a group of positive electrode sheets to the stacking platform - the film laying mechanism 30 lays a layer of diaphragm 1 - the mechanism transports a group of negative electrode sheets to the stacking platform - the film laying mechanism 30 lays a layer of diaphragm 1, and so on. And after laying a layer of positive electrode sheets and a layer of diaphragm, the positive electrode sheet pressing knife presses the material below, and after laying a layer of negative electrode sheets and a layer of diaphragm, the negative electrode sheet pressing knife presses the material below, and the positive electrode sheet pressing knife and the negative electrode sheet pressing knife work alternately and reciprocatingly.

[0204] In addition, the stacking position of the stacking table 2 can be moved in the vertical direction by a driving mechanism. After each layer of material is placed, the stacking position drops a certain distance, which drives all the laid materials to drop a certain distance, thereby ensuring that the top material always remains in a horizontal plane.

[0205] The present application also provides a battery production line. The battery production line according to the present application includes the above-mentioned stacking device.

[0206] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A film stacking device, characterized in that: include: A feeding mechanism (10) for providing the diaphragm (1); A cutting mechanism (20) is arranged at a downstream position of the feeding mechanism (10), and the cutting mechanism (20) is used to cut off the diaphragm (1); A film laying mechanism (30) is arranged at a downstream position of the cutting mechanism (20), and the film laying mechanism (30) comprises a first frame (31), a winding roller (32), a first driving structure (33) and a second driving structure (34). The first driving structure (33) is used to drive the winding roller (32) to move in a horizontal direction relative to the first frame (31), and to make the winding roller (32) have a first position close to the cutting mechanism (20) and a second position away from the cutting mechanism (20). The winding roller (32) has a film grasping state and a release state. The second driving structure (34) drives the winding roller (32) to rotate in a first direction or a second direction. The winding roller (32) is moved from a first position to a second position, or from a second position to a first position, so that the diaphragm (1) can be laid on the lamination table (2).

2. The film stacking device according to claim 1, characterized in that: The winding roller (32) comprises: A first mounting seat (321) connected to a driving end of the second driving structure (34); The first clamping plate (322) and the second clamping plate (323) are both movably arranged on the first mounting seat (321), and the first clamping plate (322) and the second clamping plate (323) can move closer to each other or move away from each other.

3. The film stacking device according to claim 2, characterized in that: The roller (32) further comprises a first elastic member (324) and a second elastic member (325), wherein the first elastic member (324) and the second elastic member (325) are both arranged on the first mounting seat (321), wherein the first elastic member (324) is suitable for applying an elastic force to the first clamping plate (322) toward the second clamping plate (323), and the second elastic member (325) is suitable for applying an elastic force to the second clamping plate (323) toward the first clamping plate (322).

4. The film stacking device according to claim 3, characterized in that: The film stacking device further comprises a clamping mechanism (40), wherein the clamping mechanism (40) comprises: A second mounting seat (41); A pushing portion (42) movably disposed on the second mounting seat (41); A third driving structure (43) is disposed on the second mounting seat (41) and is used to drive the pushing portion (42) to extend or retract. When the pushing portion (42) is in the extended state, the pushing portion (42) can open the first clamping plate (322) and the second clamping plate (323) so that the rolling roller (32) is in the loosened state.

5. The film stacking device according to claim 4, characterized in that: The rolling roller (32) further comprises a first slide plate (326) and a second slide plate (327), wherein the first slide plate (326) and the second slide plate (327) are both movably arranged on the first mounting seat (321), the first clamping plate (322) is arranged on the first slide plate (326), the first elastic member (324) is connected between the first mounting seat (321) and the first slide plate (326), the second clamping plate (323) is arranged on the second slide plate (327), and the second elastic member (325) is connected between the first mounting seat (321) and the second slide plate (327). The first slide plate (326) is provided with a first protrusion (3261), and the second slide plate (327) is provided with a second protrusion (3271). The first protrusion (3261) and the second protrusion (3271) are arranged opposite to each other. The end of the pushing part (42) includes a conical part (421). When the pushing part (42) is in an extended state, it can drive the first protrusion (3261) and the second protrusion (3271) to move away from each other.

6. The film stacking device according to claim 4, characterized in that: The clamping mechanism (40) is arranged at the first position; or, there are two clamping mechanisms (40), and the two clamping mechanisms (40) are arranged at the first position and the second position respectively.

7. The film stacking device according to any one of claims 1 to 6, characterized in that: There are two film laying mechanisms (30). In the direction perpendicular to the flow of the diaphragm (1), the two film laying mechanisms (30) are respectively located on both sides of the feeding mechanism (10). In the flow direction along the diaphragm (1), the winding rollers (32) of the two film laying mechanisms (30) are arranged opposite to each other. The film laying mechanism (30) also includes a fourth driving structure (35). The fourth driving structure (35) is used to drive the winding roller (32) to move in a vertical direction relative to the first frame (31).

8. The film stacking device according to any one of claims 1 to 6, characterized in that: The film stacking device further comprises a film clamping mechanism (50), wherein the film clamping mechanism (50) is arranged at an upstream position of the cutting mechanism (20), and the film clamping mechanism (50) is capable of clamping the diaphragm (1) or releasing the diaphragm (1).

9. The film stacking device according to claim 8, characterized in that: The film clamping mechanism (50) comprises a third mounting seat (51), a third clamping plate (52), a fourth clamping plate (53) and a fifth driving structure (54), wherein at least one of the third clamping plate (52) and the fourth clamping plate (53) is movably arranged on the third mounting seat (51), and the fifth driving structure (54) is used for driving the third clamping plate (52) and the fourth clamping plate (53) to move closer to or away from each other.

10. The film stacking device according to claim 9, characterized in that: The cutting mechanism (20) comprises a fourth mounting seat (21), a cutting strip (22) and a sixth driving structure (23); the fourth mounting seat (21) is movably arranged on the third mounting seat (51); the cutting strip (22) is arranged on the fourth mounting seat (21) and is located downstream of the third clamping plate (52) and the fourth clamping plate (53); and the sixth driving structure (23) drives the fourth mounting seat (21) to move in a vertical direction.

11. The film stacking device according to claim 10, characterized in that: At least one end of the cutting strip (22) is provided with a seventh driving structure (24), the seventh driving structure (24) being arranged on the fourth mounting seat (21) and used for applying a pulling force toward the outside to the end of the cutting strip (22).

12. The film stacking device according to claim 8, characterized in that: The film stacking device further comprises a deviation correction mechanism (60), wherein the deviation correction mechanism (60) is arranged between the feeding mechanism (10) and the film clamping mechanism (50).

13. The film stacking device according to claim 12, characterized in that: In the flow direction along the diaphragm (1), the correcting mechanism (60) includes a passing roller (61), a detection structure (62) and a correcting roller (63), and the correcting mechanism (60) also includes an eighth driving structure (64), and the eighth driving structure (64) is used to drive the cutting mechanism (20), the film clamping mechanism (50), and the correcting roller (63) to move synchronously along the flow direction perpendicular to the diaphragm (1).

14. The film stacking device according to claim 12, characterized in that: The film stacking device also includes a second frame (70), a fifth mounting seat (80) and a ninth driving structure (90); the fifth mounting seat (80) is movably arranged on the second frame (70); the ninth driving structure (90) is used to drive the fifth mounting seat (80) to move upstream or downstream along the direction of flow of the diaphragm (1) relative to the second frame; the cutting mechanism (20), the film clamping mechanism (50) and the deviation correction mechanism (60) are all arranged on the fifth mounting seat (80).

15. The film stacking device according to any one of claims 1 to 6, characterized in that: The film stacking device further comprises a slitting mechanism (100), wherein the slitting mechanism (100) is arranged at a downstream position of the cutting mechanism (20), and the slitting mechanism (100) is used to slit the diaphragm (1) into a plurality of strips.

16. The film stacking device according to claim 15, characterized in that: The slitting mechanism (100) comprises a sixth mounting seat (101), a seventh mounting seat (102), a blade (103), a tenth driving structure (104) and an adjusting structure (105); the seventh mounting seat (102) is movably arranged on the sixth mounting seat (101); the tenth driving structure (104) is arranged on the seventh mounting seat (102); the blade (103) is arranged on the driving end of the tenth driving structure (104); the tenth driving structure (104) is capable of driving the blade (103) to extend or retract; and the adjusting structure (105) is used to adjust the relative position of the seventh mounting seat (102) relative to the sixth mounting seat (101).

17. The film stacking device according to any one of claims 1 to 6, characterized in that: In the flow direction along the diaphragm (1), the feeding mechanism (10) comprises an unwinding roller (11), a pressure roller (12), an electrostatic elimination structure (13), a tensioning structure (14) and a buffer structure (15).

18. The film stacking device according to claim 17, characterized in that: The feeding mechanism (10) further comprises an eighth mounting seat (16) and an eleventh driving structure (17), the unwinding roller (11) being movably arranged on the eighth mounting seat (16), and the eleventh driving structure (17) driving the unwinding roller (11) to move along its axial direction.

19. A lamination device, characterized in that: include: Lamination table (2); A film stacking device, wherein the film stacking device is the film stacking device according to any one of claims 1 to 18, and the film laying mechanism (30) is arranged on the side of the stacking platform (2); A film-making mechanism, used for providing positive and negative electrode sheets; A transport mechanism is used to transport the positive electrode sheet and the negative electrode sheet to the stacking platform (2).

20. A battery production line, characterized in that: Comprising a lamination device as claimed in claim 19.

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