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 wherein the membrane stacking device comprises: an unwinding mechanism for unwinding a diaphragm; the cutting mechanism is arranged at the downstream position of the unwinding mechanism; the first film laying mechanism and the second film laying mechanism are both arranged at the downstream position of the cutting mechanism, the first film laying mechanism comprises a first film clamping structure and a first driving structure, the second film laying mechanism comprises a second film clamping structure and a second driving structure, and the first film clamping structure and the second film clamping structure are both provided with first positions close to the cutting mechanism. According to the structure, under the condition that only one unwinding mechanism is arranged, the high-speed staggered membrane drawing process of the first membrane laying mechanism and the second membrane laying mechanism is achieved, and the defects that in the prior art, a membrane laying mechanism in a lamination stacking machine is large in occupied space and low in membrane laying efficiency are overcome.

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 one of the important processes in battery production. During lamination, the positive electrode sheets, diaphragms and negative electrode sheets need to be stacked back and forth to form a battery cell. A lamination machine is a device specially used for the lamination process. In the prior art, lamination machines usually use two methods for lamination. One method is that the lamination table is stationary and the diaphragm unwinding mechanism moves back and forth; the other method is that the diaphragm unwinding mechanism is stationary and the lamination table moves back and forth. In these two lamination methods, the positive electrode sheets and negative electrode sheets are placed on the lamination table through a conveying mechanism cycle, and the diaphragm moves back and forth relative to the lamination table to achieve laying in two directions, and finally form a battery cell form of "positive electrode sheet-diaphragm-negative electrode sheet-diaphragm-positive electrode sheet".

[0003] However, in the above-mentioned stacking machine, on the one hand, the stacking table and the diaphragm unwinding mechanism are heavy, so the reciprocating movement speed of the two is limited, affecting the stacking efficiency; on the other hand, the reciprocating movement of the stacking table or the diaphragm unwinding mechanism requires additional planar movement space, and the diaphragm unwinding mechanism is usually arranged on the top of the stacking table, which requires additional vertical space, so the stacking machine occupies a large space.

[0004] In order to solve the above problems, some stacking machines use a planar reciprocating film-pulling method to lay the diaphragm. Specifically, the film-pulling structure lays the diaphragm in two directions during the reciprocating movement of the two sides of the stacking table, thereby improving the laying efficiency of the diaphragm. However, in this stacking machine, a diaphragm unwinding mechanism must be provided on both sides of the stacking table, which increases the space occupied by the stacking machine in the horizontal direction. Some stacking machines use a form in which a diaphragm unwinding mechanism is provided only on one side of the stacking table. However, in this stacking machine, after laying a layer of diaphragm, the film-pulling structure must return to the front side of the diaphragm unwinding mechanism to re-grab the diaphragm, and the diaphragm cannot be laid during the return process (i.e., an empty stroke), which is equivalent to halving the diaphragm laying efficiency. It can be seen that there is a technical contradiction between equipment space and laying efficiency in the prior art of diaphragm laying by planar film-pulling. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the diaphragm laying mechanism in the stacking machine in the prior art that occupies a large space and has a low film laying efficiency, thereby providing a film stacking device, a stacking device and a battery production line.

[0006] In order to solve the above problems, the present invention provides a film stacking device, including: a reeling mechanism for reeling off a diaphragm; a cutting mechanism, arranged at a downstream position of the reeling mechanism; a first film laying mechanism and a second film laying mechanism, both of which are arranged at a downstream position of the cutting mechanism, the first film laying mechanism including a first film clamping structure and a first driving structure, the second film laying mechanism including a second film clamping structure and a second driving structure, and the first film clamping structure and the second film clamping structure both have a first position close to the cutting mechanism, and a second position away from the cutting mechanism, the first driving structure drives the first film clamping structure to move between the first position and the second position, and the second driving structure drives the second film clamping structure to move between the first position and the second position, wherein the first film clamping structure and the second film clamping structure both have a film clamping state and an avoidance state, and when one of the first film clamping structure and the second film clamping structure is in the avoidance state, the first film clamping structure and the second film clamping structure can pass alternately in the horizontal direction.

[0007] Optionally, the first clamping structure and the second clamping structure move in the same horizontal plane.

[0008] Optionally, the first clamping structure and the second clamping structure both include: a first clamping plate and a second clamping plate arranged opposite to each other, and a third driving structure, the third driving structure is connected to the driving end of the first driving structure or the second driving structure, the third driving structure is used to drive the first clamping plate and the second clamping plate to move closer to or away from each other, when the first clamping plate and the second clamping plate are closed, they are in a clamping state, and when the first clamping plate and the second clamping plate are relatively opened to a preset distance, they are in an avoidance state.

[0009] Optionally, the preset distance is greater than the distance between surfaces of the first clamping plate 51 and the second clamping plate 52 that are away from each other when they are in the clamping state.

[0010] Optionally, the first clamping structure and the second clamping structure also include a screw, a first slider and a second slider, the screw is respectively provided with a first external thread segment and a second external thread segment with opposite rotation directions on both sides, the first slider is provided with a first internal thread hole and is sleeved outside the first external thread segment, the second slider is provided with a second internal thread hole and is sleeved outside the second external thread segment, the first clamping plate is provided on the first slider, and the second clamping plate is provided on the second slider.

[0011] Optionally, the film stacking device further comprises a deviation correction mechanism, and the deviation correction mechanism is arranged between the unwinding mechanism and the cutting mechanism.

[0012] Optionally, the deflection correction mechanism includes a detection sensor, a deflection correction roller and a fourth driving structure, and the fourth driving structure is used to drive the deflection correction roller to move in the horizontal and / or vertical direction.

[0013] Optionally, the deviation correction roller and the cutting mechanism move synchronously.

[0014] 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, the first film laying mechanism and the second film laying mechanism are respectively arranged on both sides 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 the negative electrode sheets to the stacking table.

[0015] The present invention also provides a battery production line, comprising the above-mentioned stacking device.

[0016] The present invention has the following advantages:

[0017] By utilizing the technical solution of the present invention, when one of the first film clamping structure and the second film clamping structure grabs the diaphragm unwound by the unwinding mechanism and moves from the first position to the second position to lay the diaphragm, the other is in an avoidance state and moves from the second position to the first position, ready to move to the front side of the unwinding mechanism to grab the diaphragm. The first film clamping structure and the second film clamping structure have opposite movement directions and staggered in the horizontal direction, so that the idle stroke time coincides with the film laying time. From the perspective of the overall film laying process of the film stacking device, there is no idle stroke, which greatly improves the film laying efficiency. The above structure realizes the high-speed staggered film pulling process of the first film laying mechanism and the second film laying mechanism when only one unwinding mechanism is set, which solves the defects of the diaphragm laying mechanism in the stacking machine in the prior art that occupies a large space and has a low film laying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic structural diagram of an embodiment of a lamination device (including a film lamination device) of the present invention is shown;

[0020] Figure 2 Shows Figure 1 The enlarged schematic diagram at A in the middle;

[0021] Figure 3 Shows Figure 1 A schematic structural diagram of a first film laying mechanism or a second film laying mechanism of a middle film stacking device;

[0022] Figure 4 Shows Figure 3 The enlarged schematic diagram of point B in the middle;

[0023] Figure 5 Shows Figure 1A schematic diagram of the structure of the first film clamping structure and the second film clamping structure of the middle film stacking device when they are staggered in the horizontal direction;

[0024] Figure 6 Shows Figure 1 A schematic diagram of the structure of the cutting and deviation-correcting mechanism of the middle film stacking device;

[0025] Figure 7 Shows Figure 1 Schematic diagram of the structure of the lamination table of the middle lamination device.

[0026] Description of reference numerals:

[0027] 1. Laminating table; 10. Unwinding mechanism; 20. Cutting mechanism; 30. First film laying mechanism; 31. First film clamping structure; 32. First driving structure; 40. Second film laying mechanism; 41. Second film clamping structure; 42. Second driving structure; 51. First clamping plate; 52. Second clamping plate; 53. Third driving structure; 54. Screw; 55. First slider; 56. Second slider; 60. Deviation correction mechanism; 61. Detection sensor; 62. Deviation correction roller; 63. Fourth driving structure. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] like Figures 1 to 5 As shown, an embodiment of the film stacking device according to the present application includes an unwinding mechanism 10, a cutting mechanism 20, a first film laying mechanism 30 and a second film laying mechanism 40. Among them, the unwinding mechanism 10 is used to unwind the diaphragm. The cutting mechanism 20 is arranged at the downstream position of the unwinding mechanism 10. The first film laying mechanism 30 and the second film laying mechanism 40 are both arranged at the downstream position of the cutting mechanism 20. The first film laying mechanism 30 includes a first film clamping structure 31 and a first driving structure 32, and the second film laying mechanism 40 includes a second film clamping structure 41 and a second driving structure 42. And the first film clamping structure 31 and the second film clamping structure 41 both have a first position close to the cutting mechanism 20, and a second position away from the cutting mechanism 20, the first driving structure 32 drives the first film clamping structure 31 to move between the first position and the second position, and the second driving structure 42 drives the second film clamping structure 41 to move between the first position and the second position.

[0033] Furthermore, the first clamping structure 31 and the second clamping structure 41 both have a clamping state and an avoidance state. When one of the first clamping structure 31 and the second clamping structure 41 is in the avoidance state, the first clamping structure 31 and the second clamping structure 41 can pass through each other in a horizontal direction.

[0034] By utilizing the technical solution of this embodiment, when one of the first film clamping structure 31 and the second film clamping structure 41 grabs the diaphragm unwound by the unwinding mechanism 10 and moves from the first position to the second position to lay the diaphragm, the other is in an avoidance state and moves from the second position to the first position, ready to move to the front side of the unwinding mechanism 10 to grab the diaphragm. The first film clamping structure 31 and the second film clamping structure 41 move in opposite directions and staggered in the horizontal direction, so that the idle stroke time coincides with the film laying time. From the perspective of the overall film laying process of the film stacking device, there is no idle stroke, which greatly improves the film laying efficiency. The above structure realizes the high-speed staggered film pulling process of the first film laying mechanism 30 and the second film laying mechanism 40 when only one unwinding mechanism 10 is set, which solves the defects of the diaphragm laying mechanism in the stacking machine in the prior art that the space occupied by the diaphragm laying mechanism is large and the film laying efficiency is low.

[0035] like Figure 1 As shown, the unwinding mechanism 10 is used to unwind the membrane material strip, which may include an unwinding roller, a passing roller, a tensioning roller, a deviation correction roller, a static elimination device, etc. The cutting mechanism 20 is arranged at the downstream position of the unwinding mechanism 10, and its function is to cut the membrane after a membrane is laid.

[0036] like Figure 1As shown, the film stacking device also includes a first film laying mechanism 30 and a second film laying mechanism 40, the structures of the two are basically the same, and are arranged along a flow direction perpendicular to the membrane ( Figure 1 The first film structure 31 and the second film structure 41 are both movable between the first direction and the second direction. Figure 1 Those skilled in the art can understand that the first direction and the second direction are actually located at the front and rear ends of the laminating table 1, respectively, so when the first clamping structure 31 or the second clamping structure 41 grabs the diaphragm and moves from the first position to the second position, a layer of diaphragm can be laid on the laminating table 1. After laying a layer of diaphragm, it is necessary to return from the second position to the first position to grab the diaphragm again.

[0037] Furthermore, the first driving structure 32 drives the first clamping structure 31 to move in the horizontal direction. The first driving structure 32 can be a linear motor, a driving cylinder, etc.

[0038] Furthermore, the second driving structure 42 drives the second clamping structure 41 to move in the horizontal direction. The second driving structure 42 can be a linear motor, a driving cylinder, etc.

[0039] In this embodiment, the movement paths of the first film clamping structure 31 and the second film clamping structure 41 are basically always in opposite states. The specific film laying process is as follows:

[0040] 1. In the initial state, the first clamping structure 31 grabs the diaphragm at the first position, and the second clamping structure 41 is at the second position;

[0041] 2. The first clamping structure 31 moves from the first position toward the second position and lays the diaphragm, and at this time, the second clamping structure 41 moves from the second position toward the first position;

[0042] 3. The first film clamping structure 31 moves to the second position to lay a layer of diaphragm, at which time the cutting mechanism 20 cuts the diaphragm, and at the same time the second film clamping structure 41 moves to the first position to grab the diaphragm;

[0043] 4. The second film sandwich structure 41 moves from the first position toward the second position and lays the diaphragm. At this time, the first film sandwich structure 31 moves from the second position toward the first position;

[0044] 5. The second film clamping structure 41 moves to the second position to lay a layer of diaphragm. At this time, the cutting mechanism 20 cuts the diaphragm, and at the same time, the first film clamping structure 31 moves to the first position to grab the diaphragm.

[0045] By repeating the above steps 2 to 4, a high-speed staggered film drawing process can be realized. Those skilled in the art can understand that in this process, the idle travel time of the film clamping structure returning from the second position to the first position is overlapped with the film laying time of moving from the first position to the second position, so there is no idle travel time from the overall operation of the film stacking device.

[0046] Therefore, in the technical solution of this embodiment, uninterrupted continuous diaphragm laying can be achieved when only one unwinding mechanism 10 is provided, thereby solving the technical contradiction between the space occupied by the equipment and the film laying efficiency in the planar film drawing process in the prior art.

[0047] In the above steps, the first clamping structure 31 and the second clamping structure 41 will intersect in the reverse motion, so the first clamping structure 31 and the second clamping structure 41 both have a clamping state and an avoidance state. The clamping state refers to the state of grabbing the diaphragm, and the avoidance state refers to the two being able to cross each other in the horizontal direction without interference.

[0048] In the above steps 2 and 3, the first clamping structure 31 is in the clamping state, and the second clamping structure 41 is in the avoiding state. Correspondingly, in the above steps 4 and 5, the first clamping structure 31 is in the avoiding state, and the second clamping structure 41 is in the clamping state.

[0049] Optionally, the first sandwich structure 31 and the second sandwich structure are in an avoidance state, and can avoid by moving their own structures or positions.

[0050] like Figure 5 As shown, in the technical solution of this embodiment, the first clamping structure 31 and the second clamping structure 41 move in the same horizontal plane, that is, the two move back and forth alternately in the same plane.

[0051] Furthermore, in this embodiment, the first clamping structure 31 and the second clamping structure 41 are in an avoidance state, and their own structures are moved to switch to the avoidance state, so the height positions of the first clamping structure 31 and the second clamping structure 41 do not change.

[0052] With such arrangement, on the one hand, there is no need to add a vertical module to control the vertical height of the first clamping structure 31 and the second clamping structure 41, which simplifies the structure and the control process; on the other hand, the first clamping structure 31 and the second clamping structure 41 only move back and forth within the plane, the movement process is simple, and the production rhythm is more compact.

[0053] like Figure 3 and Figure 4As shown, in the technical solution of this embodiment, the first clamping structure 31 and the second clamping structure 41 both include a first clamping plate 51 and a second clamping plate 52 arranged opposite to each other, and a third driving structure 53. The third driving structure 53 is connected to the driving end of the first driving structure 32 or the second driving structure 42, and the third driving structure 53 is used to drive the first clamping plate 51 and the second clamping plate 52 to move closer to each other or away from each other. When the first clamping plate 51 and the second clamping plate 52 are closed, they are in the clamping state, and when the first clamping plate 51 and the second clamping plate 52 are relatively opened to a preset distance L, they are in the avoidance state.

[0054] Specifically, the first clamping structure 31 and the second clamping structure 41 are substantially the same, and both include a first clamping plate 51 and a second clamping plate 52. The first clamping plate 51 and the second clamping plate 52 can be opened and closed by the third driving structure 53. It can be understood by those skilled in the art that when the first clamping plate 51 and the second clamping plate 52 are closed, the diaphragm can be clamped, so that the diaphragm can be pulled when the clamping structure moves, thereby laying the diaphragm. When the first clamping plate 51 and the second clamping plate 52 of one of the first clamping structure 31 and the second clamping structure 41 are opened by a preset distance, the two can be staggered and pass without interference in the horizontal direction.

[0055] Furthermore, the preset distance L is greater than the distance between the surfaces of the first clamping plate 51 and the second clamping plate 52 which are away from each other when they are in the clamping state.

[0056] like Figure 5 As shown, taking the first clamping structure 31 moving toward the second direction and the second clamping structure 41 moving toward the first direction as an example, at this time, the first clamping plate 51 and the second clamping plate 52 of the first clamping structure 31 are closed and grab the diaphragm. At the same time, the first clamping plate 51 and the second clamping plate 52 of the second clamping structure 41 are opened to a distance greater than the distance (marked L in the figure) between the surfaces of the first clamping plate 51 and the second clamping plate 52 facing each other when they are in the clamping state, so that the first clamping structure 31 and the second clamping structure 41 can pass through each other in a staggered manner in the horizontal direction.

[0057] It should be noted that the distance between the surfaces of the first clamping plate 51 and the second clamping plate 52 facing each other when they are in the clamping state, that is, Figure 5 The distance between the upper surface of the first clamping plate 51 and the lower surface of the second clamping plate 52 of the second clamping membrane structure 41 includes the wall thickness of the first clamping plate 51, the wall thickness of the second clamping plate 52 and the thickness of the material (or other object) between the first clamping plate 51 and the second clamping plate 52.

[0058] like Figure 4As shown, in the technical solution of this embodiment, the first clamping film structure 31 and the second clamping film structure 41 both further include a screw rod 54, a first slider 55 and a second slider 56. The screw rod 54 is provided with a first external thread segment and a second external thread segment with opposite rotation directions on both sides, the first slider 55 is provided with a first internal thread hole and sleeved outside the first external thread segment, the second slider 56 is provided with a second internal thread hole and sleeved outside the second external thread segment, the first clamping plate 51 is provided on the first slider, and the second clamping plate 52 is provided on the second slider.

[0059] Through the above structure, the third driving structure 53 can drive the screw rod 54 to rotate, and the driving method can be direct drive or indirect drive. For example, the third driving structure 53 includes a motor, and the motor shaft of the motor can be directly connected to the screw rod 54, or can be connected through a transmission structure such as a belt or chain.

[0060] When the motor shaft of the motor rotates in the first direction, the first slider 55 and the second slider 56 can be driven to move away from each other, that is, the first clamping plate 51 and the second clamping plate 52 can be driven to move away from each other. At this time, the first clamping structure 31 and the second clamping structure 41 can be in an avoidance state.

[0061] When the motor shaft of the motor rotates in the second direction, the first slider 55 and the second slider 56 are driven to move toward each other, that is, the first clamping plate 51 and the second clamping plate 52 are driven to move toward each other. At this time, the first clamping structure 31 and the second clamping structure 41 are in the clamping state.

[0062] like Figure 6 As shown, in the technical solution of this embodiment, the film stacking device further includes a deviation correction mechanism 60, which is arranged between the unwinding mechanism 10 and the cutting mechanism 20. Specifically, before the first film clamping structure 31 and the second film clamping structure 41 grab the diaphragm, the deviation correction mechanism 60 needs to correct the position of the diaphragm to ensure the grabbing accuracy, thereby ensuring the position accuracy of the diaphragm laid on the stacking table 1.

[0063] Furthermore, the deflection correcting mechanism 60 includes a detection sensor 61, a deflection correcting roller 62 and a fourth driving structure 63, and the fourth driving structure 63 is used to drive the deflection correcting roller 62 to move in the horizontal and / or vertical direction.

[0064] Specifically, the detection sensor 61 detects whether the deviation of the diaphragm exceeds a threshold value. The correction roller 62 is used to apply friction to the diaphragm strip to achieve correction. When the detection sensor 61 detects that the deviation of the diaphragm exceeds the threshold value, the fourth driving structure 63 drives the correction roller 62 to move, thereby driving the diaphragm strip to move, until the detection sensor 61 detects that the deviation of the diaphragm is within the threshold value.

[0065] Optionally, the fourth driving structure 63 can drive the correcting roller 62 to move in a horizontal direction, including a direction perpendicular to the flow direction of the diaphragm, and the fourth driving structure 63 can also drive the correcting roller 62 to move in a vertical direction.

[0066] Furthermore, the deviation-correcting roller 62 and the cutting mechanism 20 move synchronously, thereby ensuring the position consistency of the diaphragm downstream after deviation correction.

[0067] like Figure 1 and Figure 7 As shown, the present application also provides a lamination device. According to an embodiment of the lamination device of the present application, the lamination platform 1, the above-mentioned film lamination device, a film-making mechanism and a conveying mechanism are included. Among them, the first film-laying mechanism and the second film-laying mechanism of the film-laying device are respectively arranged on both sides of the lamination platform 1. The film-making mechanism is used to provide positive electrode sheets and negative electrode sheets. The conveying mechanism is used to convey the positive electrode sheets and the negative electrode sheets to the lamination platform 1.

[0068] from Figure 7 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.

[0069] Furthermore, the unwinding mechanism 10 and the cutting mechanism 20 of the film stacking device are located at the ends of the stacking platform 1. The first film laying mechanism 30 and the second film laying mechanism 40 are located at both sides of the stacking platform 1 respectively.

[0070] In this embodiment, only one unwinding mechanism 10 is provided on one side of the lamination platform 1 .

[0071] 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.

[0072] Furthermore, the working process of the laminating device is, "... the conveying mechanism conveys a group of positive electrode sheets to the laminating platform 1 - the first film laying mechanism 30 lays a layer of diaphragm - the mechanism conveys a group of negative electrode sheets to the laminating platform 1 - the second film laying mechanism 40 lays a layer of diaphragm...", 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.

[0073] In addition, the stacking position of the stacking table 1 can be moved in the vertical direction by a driving mechanism. After each layer of material is placed, the stacking position is lowered by a certain distance, which drives all the laid materials to be lowered by a certain distance, thereby ensuring that the top material always remains in a horizontal plane.

[0074] The present application also provides a battery production line. The battery production line according to the present application includes the above-mentioned stacking device.

[0075] 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: An unwinding mechanism (10) for unwinding the diaphragm; A cutting mechanism (20) is arranged at a downstream position of the unwinding mechanism (10); The first film laying mechanism (30) and the second film laying mechanism (40) are both arranged at a downstream position of the cutting mechanism (20); the first film laying mechanism (30) includes a first film clamping structure (31) and a first driving structure (32); the second film laying mechanism (40) includes a second film clamping structure (41) and a second driving structure (42); and the first film clamping structure (31) and the second film clamping structure (41) both have a first position close to the cutting mechanism (20) and a second position away from the cutting mechanism (20); the first driving structure (32) drives the first film clamping structure (31) to move between the first position and the second position; and the second driving structure (42) drives the second film clamping structure (41) to move between the first position and the second position. Wherein, the first clamping structure (31) and the second clamping structure (41) both have a clamping state and an avoidance state. When one of the first clamping structure (31) and the second clamping structure (41) is in the avoidance state, the first clamping structure (31) and the second clamping structure (41) can pass through each other in a horizontal direction.

2. The film stacking device according to claim 1, characterized in that: The first clamping structure (31) and the second clamping structure (41) move in the same horizontal plane.

3. The film stacking device according to claim 1 or 2, characterized in that: The first clamping structure (31) and the second clamping structure (41) both comprise: a first clamping plate (51) and a second clamping plate (52) which are arranged opposite to each other, and a third driving structure (53), wherein the third driving structure (53) is connected to the driving end of the first driving structure (32) or the second driving structure (42), and the third driving structure (53) is used to drive the first clamping plate (51) and the second clamping plate (52) to move closer to or away from each other, and when the first clamping plate (51) and the second clamping plate (52) are closed, they are in the clamping state, and when the first clamping plate (51) and the second clamping plate (52) are relatively opened to a preset distance (L), they are in the avoidance state.

4. The film stacking device according to claim 3, characterized in that: The preset distance (L) is greater than the distance between the surfaces of the first clamping plate (51) and the second clamping plate (52) that are away from each other when they are in a clamping state.

5. The film stacking device according to claim 3, characterized in that: The first clamping structure (31) and the second clamping structure (41) both further include a screw (54), a first slider (55) and a second slider (56), wherein the screw (54) is provided with a first external thread segment and a second external thread segment of opposite rotation directions on both sides thereof, the first slider (55) is provided with a first internal thread hole and is sleeved on the outside of the first external thread segment, the second slider (56) is provided with a second internal thread hole and is sleeved on the outside of the second external thread segment, the first clamping plate (51) is provided on the first slider, and the second clamping plate (52) is provided on the second slider.

6. The film stacking device according to claim 1 or 2, characterized in that: The film stacking device further comprises a deviation correction mechanism (60), wherein the deviation correction mechanism (60) is arranged between the unwinding mechanism (10) and the cutting mechanism (20).

7. The film stacking device according to claim 6, characterized in that: The deflection correction mechanism (60) comprises a detection sensor (61), a deflection correction roller (62) and a fourth driving structure (63), wherein the fourth driving structure (63) is used for driving the deflection correction roller (62) to move in a horizontal and / or vertical direction.

8. The film stacking device according to claim 7, characterized in that: The deviation-correcting roller (62) and the cutting mechanism (20) move synchronously.

9. A lamination device, characterized in that: include: Lamination table (1); A film stacking device, wherein the film stacking device is the film stacking device according to any one of claims 1 to 8, wherein the first film laying mechanism and the second film laying mechanism are respectively arranged on both sides of the stacking platform (1); 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 (1).

10. A battery production line, characterized in that: Comprising the lamination device as claimed in claim 9.

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