Movement mechanism of film-drawing shaft, lamination stacking machine and movement track control method

Abstract

The embodiment of the invention provides a movement mechanism of a film-drawing shaft, a lamination machine and a movement track control method, and the movement mechanism of the film-drawing shaft comprises a fixed diaphragm double-passing roller, a film-drawing shaft upper double-roller, a diaphragm buffer roller, a film-drawing shaft lower double-roller and a lamination pressing cutter which are used for a diaphragm to pass through in sequence, the film-drawing shaft upper double rollers, the diaphragm buffer roller and the film-drawing shaft lower double rollers are all movably arranged; at least parts of the motion trails of the film-drawing shaft upper double rollers and the film-drawing shaft lower double rollers are curves; and the diaphragm temporary storage roller is used for opening the diaphragm when the belt length of the diaphragm between the upper double rollers of the diaphragm drawing shaft and the lower double rollers of the diaphragm drawing shaft is reduced. According to the embodiment of the utility model, at least parts of the motion trails of the upper double rollers and the lower double rollers of the membrane drawing shaft are set to be curves, so that the length of the membrane drawing belt from the upper double rollers of the membrane drawing shaft to the fixed membrane double-passing roller is kept unchanged, the length of the membrane belt from the lower double rollers of the membrane drawing shaft to the lamination pressing knife is kept unchanged, and the stability of membrane tension is promoted; and the precision of the stacked battery cell is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production and processing, and in particular to a motion mechanism of a film drawing shaft, a laminating machine and a motion trajectory control method. Background Art

[0002] In the current stacking equipment market, in order to meet the ever-increasing production speed and the strict requirements of battery cell alignment accuracy, the diaphragm is generally driven to move horizontally left and right through the synergistic effect of the double rollers on the film-pulling shaft and the double rollers under the film-pulling shaft, so as to achieve the alternating Z-shaped stacking of positive and negative electrode sheets. The film-pulling shaft trajectory scheme currently commonly used in the market is: the entire set of film-pulling shafts composed of the double rollers on the film-pulling shaft and the double rollers under the film-pulling shaft drives the diaphragm to move horizontally left and right.

[0003] However, the solutions of the prior art have the following disadvantages:

[0004] like Figure 1 As shown, the length of the diaphragm strip from the fixed diaphragm double roller A to the double roller B on the film-pulling shaft (a1b1 to a1b2 process) is continuously shortened, and the length from the stacking press D to the double roller C under the film-pulling shaft (c1d1 to c2d1) is continuously shortened, and the shortest positions of the AB segment and the CD segment are inconsistent, and vice versa; the continuous shortening of the diaphragm strip length will make the diaphragm tension fluctuation difficult to control, which will lead to a decrease in the accuracy of stacking the battery cells. Summary of the invention

[0005] The present invention provides a motion mechanism of a film-drawing shaft, a stacking machine and a motion trajectory control method, aiming to solve the problem in the prior art that when a whole set of film-drawing shaft drives the diaphragm to move horizontally left and right as a whole, the inconsistent length of the diaphragm leads to reduced accuracy of stacking cells.

[0006] The embodiment of the present invention provides a motion mechanism of a film-drawing shaft, comprising: a fixed diaphragm double roller, a double roller on the film-drawing shaft, a diaphragm buffer roller, a double roller under the film-drawing shaft and a lamination press knife, the double roller on the film-drawing shaft, the diaphragm buffer roller and the double roller under the film-drawing shaft are all movably arranged;

[0007] The movement trajectories of the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are at least partially curved; the diaphragm buffer roller is used to open the diaphragm when the length of the diaphragm between the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft decreases.

[0008] An embodiment of the present invention further provides a laminating machine, comprising the motion mechanism of the film drawing shaft as described above.

[0009] The embodiment of the present invention further provides a motion trajectory control method, which is applied to the motion mechanism of the film drawing shaft, comprising:

[0010] When the diaphragm needs to be moved from the first side to the second side, the double rollers on the film-drawing shaft, the double rollers under the film-drawing shaft and the diaphragm buffer roller are controlled to move in the following manner: at least part of the movement trajectory of the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft is a curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate from the first side to the second side to abut against the diaphragm.

[0011] Optionally, the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the membrane buffer roller are controlled to move in the following manner, including:

[0012] The double rollers on the film-drawing axis, the double rollers under the film-drawing axis and the diaphragm buffer roller are controlled to move in a first manner: the movement trajectories of the double rollers on the film-drawing axis and the double rollers under the film-drawing axis are respectively a lower curve and an upper curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate from the first side to the second side to support the diaphragm.

[0013] Optionally, after controlling the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the membrane buffer roller to move in the first manner, the method includes:

[0014] When the diaphragm moves from the first side to the first middle position, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in a second manner: the movement trajectories of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis are both translational from the first side to the second side, and the movement trajectory of the diaphragm buffer roller is controlled to translational from the first side to the second side to support the diaphragm.

[0015] Optionally, after controlling the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the membrane buffer roller to move in the second manner, the method includes:

[0016] When the diaphragm moves from the first middle position to the second middle position, the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are controlled to move in a third manner: the movement trajectory of the double rollers on the film-drawing shaft is vertical upward translation, and the movement trajectory of the double rollers under the film-drawing shaft is vertical downward translation, so that the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are restored to the height at the first side.

[0017] Optionally, in the first mode movement and the second mode movement state, the lower end of the diaphragm is connected to the end of the lamination pressing knife close to the first side;

[0018] In the third moving state, the lamination pressing knife controls the lower end of the diaphragm to move toward the second side, so that the lower end of the diaphragm is connected to the end of the lamination pressing knife close to the second side.

[0019] Optionally, when moving in the first mode, the motion trajectory of the double rollers on the film-drawing shaft is an arc curve with the fixed diaphragm double rollers as the center, and the motion trajectory of the double rollers under the film-drawing shaft is an arc curve with the end of the stacking press knife close to the first side as the center.

[0020] Optionally, also include:

[0021] When the diaphragm needs to be moved from the first side to the second side, the diaphragm buffer roller presses against the diaphragm from the direction close to the first side relative to the diaphragm; when the diaphragm needs to be moved from the second side to the first side, the diaphragm buffer roller presses against the diaphragm from the direction close to the second side relative to the diaphragm.

[0022] Optionally, also include:

[0023] When the diaphragm needs to be moved from the second side to the first side, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in the following manner: at least part of the movement trajectory of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis is a curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate in the direction from the second side to the first side to support the diaphragm.

[0024] The embodiment of the present invention provides a motion mechanism of a film-drawing shaft, a laminating machine and a motion trajectory control method, wherein the motion mechanism of the film-drawing shaft includes: a fixed diaphragm double roller, a double roller on the film-drawing shaft, a diaphragm buffer roller, a double roller under the film-drawing shaft and a laminating press knife for the diaphragm to pass through in sequence, the double roller on the film-drawing shaft, the diaphragm buffer roller and the double roller under the film-drawing shaft are all movably arranged; the motion trajectories of the double roller on the film-drawing shaft and the double roller under the film-drawing shaft are at least partially curved; the diaphragm buffer roller is used to open the diaphragm when the length of the diaphragm between the double roller on the film-drawing shaft and the double roller under the film-drawing shaft is reduced. In this embodiment, by setting at least part of the motion trajectories of the double roller on the film-drawing shaft and the double roller under the film-drawing shaft as a curve, it is ensured that the length of the diaphragm tape from the double roller on the film-drawing shaft to the fixed diaphragm double roller remains unchanged, and at the same time, the length of the diaphragm tape from the double roller under the film-drawing shaft to the laminating press knife remains unchanged, thereby promoting the stability of the diaphragm tension and further improving the accuracy of stacking the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the motion trajectory of a film-drawing shaft in the prior art provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a motion trajectory of a film-drawing shaft moving from a first side to a second side provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the motion trajectory of the film-drawing shaft provided in an embodiment of the present invention in a first motion state;

[0029] Figure 4 A schematic diagram of a motion trajectory of a film-drawing shaft moving from the second side to the first side provided in an embodiment of the present invention;

[0030] Figure 5 The motion trajectory of the entire film-drawing axis during one cycle of motion provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0032] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0033] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0034] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] See also Figure 2An embodiment of the present invention provides a motion mechanism of a film-drawing shaft, including: a fixed diaphragm double roller, an upper double roller of the film-drawing shaft, a diaphragm buffer roller, a lower double roller of the film-drawing shaft and a stacking press knife for allowing the diaphragm to pass through in sequence, the upper double roller of the film-drawing shaft, the diaphragm buffer roller and the lower double roller of the film-drawing shaft are all movably arranged; the motion trajectories of the upper double roller of the film-drawing shaft and the lower double roller of the film-drawing shaft are at least partially curved; the diaphragm buffer roller is used to open the diaphragm when the length of the diaphragm between the upper double roller of the film-drawing shaft and the lower double roller of the film-drawing shaft is reduced.

[0036] In this embodiment, the fixed diaphragm double roller is the starting point for the diaphragm to enter the film-drawing shaft, and plays a role in guiding and supporting the diaphragm. The double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are movably arranged so that the diaphragm can move along a specific trajectory, wherein at least a portion of the motion trajectory is a curve. The diaphragm buffer roller is capable of stretching the diaphragm when the length of the diaphragm strip between the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft is reduced, so that the length of the diaphragm strip from the fixed double roller to the lamination press remains unchanged. The lamination press is the end point of the lamination machine equipment, and is used for final processing such as cutting or laminating the previously processed diaphragm.

[0037] This embodiment ensures that the length of the diaphragm belt from the double rollers on the film-drawing shaft to the fixed diaphragm double-roller diaphragm belt remains unchanged, and at the same time ensures that the length of the diaphragm belt from the double rollers under the film-drawing shaft to the lamination pressing knife remains unchanged, by setting at least part of the movement trajectory of the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft as curves.

[0038] An embodiment of the present invention further provides a laminating machine, comprising the motion mechanism of the film drawing shaft as described above.

[0039] like Figure 2 As shown, an embodiment of the present invention further provides a motion trajectory control method, which is applied to the motion mechanism of the film drawing shaft as described above, comprising:

[0040] When the diaphragm needs to be moved from the first side to the second side, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move as follows: at least part of the movement trajectory of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis is a curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate in the direction from the first side to the second side to support the diaphragm.

[0041] In this embodiment, when the film-pulling shaft swings left and right, the movement trajectories of the double rollers on the film-pulling shaft and the double rollers under the film-pulling shaft move along a curve. This trajectory can ensure that the length of the diaphragm belt remains unchanged during the initial positive and negative reversing cycle of the film-pulling shaft, thereby ensuring the stability of the diaphragm tension and further improving the accuracy of stacking the battery cells.

[0042] In a specific embodiment, it is assumed that the film-pulling axis is at the horizontal leftmost end (i.e., the first side), and the diaphragm is threaded along the initial red trajectory a1b1c1d1e1, and the motor in the stacking machine equipment drives the entire film-pulling axis to move to the right (toward the second side), and the double rollers B on the film-pulling axis move along the lower curved trajectory, so that the belt lengths of a1b1, a1b2, a1b3, a1b4, a1b5, and a1b6 are consistent.

[0043] At the same time, the movement trajectories of the double roller B on the film-pulling axis and the double roller D under the film-pulling axis are symmetrical, so the double roller D under the film-pulling axis moves along the upper curved trajectory, so that the belt lengths from e1d1 to e1d2, e1d3 to e2d6, and e2d4 to e2d5 remain unchanged.

[0044] When the diaphragm moves from the first side to the second side, since the length of the belt from b1d1 to b2d2 under this motion trajectory is constantly shortening, this change in belt length can be offset by driving the diaphragm buffer roller C to the right from c1 to c2 and c2 to c3. For example, when driving to the right from c1 to c2, the diaphragm buffer roller will press against the diaphragm. It can also be offset by driving to the left from c3 to c4 and c4 to c1.

[0045] Further, such as Figure 3 As shown, the double rollers B on the film-pulling shaft, the double rollers D under the film-pulling shaft and the diaphragm buffer roller C are controlled to move in the following manner, including: controlling the double rollers B on the film-pulling shaft, the double rollers D under the film-pulling shaft and the diaphragm buffer roller C to move in a first manner: the movement trajectories of the double rollers B on the film-pulling shaft and the double rollers D under the film-pulling shaft are a lower curve and an upper curve respectively, and controlling the movement trajectory of the diaphragm buffer roller C to translate from the first side to the second side to support the diaphragm.

[0046] In this embodiment, the process of the first mode of movement can be explained as when the film-pulling shaft moves from the initial red trajectory a1b1c1d1e1 to the right (the second side), the double rollers B on the film-pulling shaft move along the lower curved trajectory, so that the belt length from a1b1 to a1b2 remains unchanged, and the lower double rollers D of the film-pulling shaft move along the upper curved trajectory, so that the belt length from e1d1 to e1d2 remains unchanged, and the movement trajectory of the diaphragm buffer roller C is from c1 to c2. At this time, the diaphragm buffer roller C is driven to the right to make the belt length from b1d1 to b2d2 consistent. At this time, the diaphragm buffer roller C resists the diaphragm to support the diaphragm, thereby ensuring that the belt length from the red trajectory a1b1c1d1e1 to the yellow trajectory a1b2c2d2e1 remains unchanged.

[0047] Furthermore, after controlling the double rollers on the film-pulling shaft, the double rollers under the film-pulling shaft and the diaphragm buffer roller C to move in a first manner, it includes: when the diaphragm moves from the first side to the first middle position, controlling the double rollers on the film-pulling shaft, the double rollers under the film-pulling shaft and the diaphragm buffer roller to move in a second manner: the movement trajectories of the double rollers on the film-pulling shaft and the double rollers under the film-pulling shaft are both translational movements from the first side to the second side, and the movement trajectory of the diaphragm buffer roller is controlled to be translational movements from the first side to the second side to support the diaphragm.

[0048] In this embodiment, after controlling the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the diaphragm buffer roller to move in the first manner, when the diaphragm from the lower double roller D of the film-drawing shaft to the left lamination pressing knife E1 in the motion trajectory of the film-drawing shaft is in a vertical state (that is, e1d2 is vertical), the position of the yellow trajectory a1b2c2d2e1 no longer changes, and the motor drives the upper double rollers of the film-drawing shaft and the lower double rollers of the film-drawing shaft to move in the second manner, that is, the motion trajectories of the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the diaphragm buffer roller are all translational movements from the first side to the second side, the motion trajectory of the upper double rollers of the film-drawing shaft is from b2 to b3, the motion trajectory of the lower double rollers of the film-drawing shaft is from d2 to d3, the motion trajectory of the diaphragm buffer roller is from c2 to c3, and the motion trajectory is the blue trajectory a1b3c3d3e1.

[0049] It should be noted that in the prior art, there is a diaphragm buffer mechanism during the entire diaphragm tape running process, which is used to adapt to the change in the diaphragm length during the movement of the film pulling shaft to stabilize the speed curve of the diaphragm movement. However, due to high-speed lamination, such as Figure 1 As shown, through simulation analysis, it is known that at the moment of the red trajectory a1b1c1d1e1 to the right or the blue trajectory a1b3c3d3 to the left reversing movement, there will be a mismatch in acceleration between the cache mechanism and the film pulling axis mechanism (instantaneous mutation). At this moment, the speed curve of the cache mechanism will mutate, making it difficult to ensure that the diaphragm cache change is consistent with the film pulling axis.

[0050] Therefore, in the present embodiment, the motion trajectory of the film-pulling shaft has passed the mutation critical point of the buffer mechanism, and the subsequent change in the length of the diaphragm belt can be ensured by the buffer mechanism above the double roller A of the fixed diaphragm.

[0051] Furthermore, after controlling the double rollers on the film-drawing shaft, the double rollers under the film-drawing shaft and the diaphragm buffer roller to move in the second manner, it includes: when the diaphragm moves from the first middle position to the second middle position, controlling the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft to move in the third manner: the movement trajectory of the double rollers on the film-drawing shaft is vertical upward translation, and the movement trajectory of the double rollers under the film-drawing shaft is vertical downward translation, so that the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft return to the height at the first side.

[0052] In this embodiment, after the double rollers on the film-pulling shaft, the double rollers under the film-pulling shaft and the diaphragm buffer roller move in the second manner, the double rollers on the film-pulling shaft and the double rollers under the film-pulling shaft are controlled to move in the third manner, that is, starting from the blue trajectory a1b3c3d3e1, they move in the third manner.

[0053] Specifically, the double rollers B on the film-drawing shaft move vertically upward, and the motion trajectory is from b3 to b4. The double rollers D under the film-drawing shaft move vertically downward, and the motion trajectory is from d3 to d4. At this moment, the motion trajectory of the film-drawing shaft is the orange trajectory a1b4c3d4e2.

[0054] To summarize, the above steps specifically describe the process of the film-pulling shaft moving from the first side to the second side, and the trajectory of movement from the second side to the first side is the same as the trajectory of movement from the first side to the second side, except that the double rollers on the film-pulling shaft, the double rollers under the film-pulling shaft and the diaphragm buffer roller are in opposite directions on the film-pulling shaft, which is specifically described in the following embodiments.

[0055] Furthermore, in the first mode movement and the second mode movement state, the lower end of the diaphragm is connected to the end of the lamination press knife close to the first side; in the third mode movement state, the lamination press knife controls the lower end of the diaphragm to move toward the second side, so that the lower end of the diaphragm is connected to the end of the lamination press knife close to the second side.

[0056] In this embodiment, in the first mode of motion, the motion trajectory of the film-drawing axis is the yellow trajectory a1b2c2d2e1, and in the second mode of motion, the motion trajectory of the film-drawing axis is the blue trajectory a1b3c3d3e1. Figure 2 It can be seen that the lower end of the diaphragm is connected to the end E1 of the lamination pressing knife close to the first side (the leftmost end). In the third mode of motion, the lamination pressing knife controls the lower end of the diaphragm to move toward the second side, and the end E2 of the lamination pressing knife close to the second side moves forward to press the diaphragm e1d3 section, so that the lower end of the diaphragm is connected to the end E2 of the lamination pressing knife close to the second side.

[0057] Furthermore, when moving in the first mode, the movement trajectory of the double rollers on the film-drawing shaft is an arc curve with the fixed diaphragm double rollers as the center, and the movement trajectory of the double rollers under the film-drawing shaft is an arc curve with the end of the stacking press knife close to the first side as the center.

[0058] In this embodiment, in the state of the first mode of movement, in order to ensure that the length of the strip from a1b1 to a1b2 remains unchanged and the length of the strip from e1d1 to e1d2 remains unchanged, when the double rollers B on the film-pulling shaft move along the lower curve trajectory, the movement trajectory of the double rollers on the film-pulling shaft is an arc curve with the fixed diaphragm double rollers as the center, and when the double rollers D under the film-pulling shaft move along the upper curve trajectory, the movement trajectory of the double rollers under the film-pulling shaft is an arc curve with the end of the stacking knife close to the first side as the center, which can ensure that the length of the diaphragm strip remains unchanged within the initial positive and negative reversing cycle of the film-pulling shaft, thereby promoting the stability of the diaphragm tension, and can further improve the accuracy of stacking the battery cells.

[0059] Furthermore, the motion trajectory control method also includes: when the diaphragm needs to be moved from the first side to the second side, the diaphragm buffer roller presses against the diaphragm from the direction relative to the diaphragm close to the first side; when the diaphragm needs to be moved from the second side to the first side, the diaphragm buffer roller presses against the diaphragm from the direction relative to the diaphragm close to the second side.

[0060] In this embodiment, when the diaphragm moves from the first side to the second side, since the double rollers B on the film-pulling shaft move along the lower curved trajectory and the double rollers D under the film-pulling shaft move along the upper curved trajectory, although the belt length from a1b1 to a1b2 and the belt length from e1d1 to e1d2 are guaranteed to remain unchanged, the diaphragm length gradually decreases during the movement from b1d1 to b2d2. In order to eliminate the change in the diaphragm length of this section, the diaphragm buffer roller C is made to abut the diaphragm from the direction close to the first side relative to the diaphragm, so that the diaphragm is abutted by the diaphragm buffer roller C between the double rollers B on the film-pulling shaft and the double rollers D under the film-pulling shaft and is bent toward the second side to increase its length. Therefore, the increased length of the diaphragm due to the abutment and bending by the diaphragm buffer roller C is offset by the reduced length of the diaphragm during the movement from b1d1 to b2d2, thereby ensuring that the belt length from the red trajectory a1b1c1d1e1 to the yellow trajectory a1b2c2d2e1 remains unchanged. On the contrary, when the diaphragm moves from the second side to the first side, the diaphragm buffer roller C presses against the diaphragm from the direction close to the second side relative to the diaphragm, so that the diaphragm is pressed against by the diaphragm buffer roller C between the double rollers B on the film-pulling shaft and the double rollers D under the film-pulling shaft and is bent toward the first side to increase its length. Thus, the increased length of the diaphragm caused by being pressed against and bent by the diaphragm buffer roller C is offset by the reduced length of the diaphragm during the movement from b3d3 to b4d4.

[0061] Further, such as Figure 4 As shown, the motion trajectory control method also includes: when the diaphragm needs to be moved from the second side to the first side, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in the following manner: at least part of the motion trajectory of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis is a curve, and the motion trajectory of the diaphragm buffer roller is controlled to translate in the direction from the second side to the first side to support the diaphragm.

[0062] In this embodiment, the following is the motion trajectory of the film-drawing shaft moving from the second side to the first side. Specifically, the film-drawing shaft is at the rightmost horizontal end at this moment, showing the orange trajectory a1b4c3d4e2 state, and the motor drives the entire film-drawing shaft to move to the left, that is, to move from the second side to the first side. At this time, the double rollers B on the film-drawing shaft move along the lower curve trajectory, and the motion trajectory is from b4 to b5. The motion process makes the belt length from a1b4 to a1b5 unchanged. The double rollers D under the film-drawing shaft move along the upper curve trajectory, and the motion trajectory is from d4 to d5. The motion process makes the belt length from e2d4 to e2d5 unchanged. When this trajectory moves, the belt length from b4d4 to b5d5 is constantly shortened. This section of belt length change can be offset by driving the membrane buffer roller C to the left. The motion trajectory of the membrane buffer roller C is from c3 to c4, thereby ensuring that the belt length from the orange trajectory a1b4c3d4e2 to the green trajectory a1b5c4d5e2 remains unchanged.

[0063] When the diaphragm from the double roller D under the film-drawing shaft to the lamination pressing knife E2 in the motion trajectory of the film-drawing shaft is completely vertical (that is, when e2d5 becomes vertical), the belt length position of the green trajectory a1b5c4d5e2 no longer changes, and the motor drives the film-drawing shaft to move toward the first side.

[0064] It should be noted that the green trajectory a1b5c4d5e2 of this movement has crossed the mutation critical point of the buffer mechanism of the fixed diaphragm double roller A, and the subsequent change in the diaphragm belt length can be guaranteed by the buffer mechanism above the fixed diaphragm double roller A.

[0065] At this time, the diaphragm presents a purple trajectory a1b6c1d6e2, and the stacking knife E1 moves forward and presses down on the diaphragm segment d6e2. At the same time, the double rollers B on the film-pulling shaft move vertically upward, and the motion trajectory is from b6 to b1. The double rollers D under the film-pulling shaft move vertically downward, and the motion trajectory is from d6 to d1. At this moment, the motion trajectory of the film-pulling shaft presents a red trajectory a1b1c1d1e1, that is, it returns to the initial position of the diaphragm, completing a cycle of the entire film-pulling shaft diaphragm movement. After that, the film-pulling shaft moves alternately left and right along the above-mentioned motion trajectory until the entire battery cell production is completed.

[0066] In summary, if Figure 5 The figure shows the motion trajectory of the entire film-pulling axis diaphragm during one cycle of motion.

[0067] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0068] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0069] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A motion mechanism of a film-drawing shaft, characterized in that: include: A fixed membrane double-passing roller, a double roller on a film-drawing shaft, a membrane buffer roller, a double roller under the film-drawing shaft and a lamination press are provided for the membrane to pass through in sequence, wherein the double roller on the film-drawing shaft, the membrane buffer roller and the double roller under the film-drawing shaft are all movably provided; The movement trajectories of the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are at least partially curved; the diaphragm buffer roller is used to open the diaphragm when the length of the diaphragm between the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft decreases.

2. A lamination machine, characterized in that: It comprises the motion mechanism of the film-drawing shaft as described in claim 1.

3. A motion trajectory control method, applied to the motion mechanism of the film drawing shaft as claimed in claim 1, characterized in that: include: When the diaphragm needs to be moved from the first side to the second side, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in the following manner: at least part of the movement trajectory of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis is a curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate in the direction from the first side to the second side to support the diaphragm.

4. The motion trajectory control method according to claim 3, characterized in that: The upper double roller of the film drawing shaft, the lower double roller of the film drawing shaft and the diaphragm buffer roller are controlled to move in the following manner, including: The double rollers on the film-drawing axis, the double rollers under the film-drawing axis and the diaphragm buffer roller are controlled to move in a first manner: the movement trajectories of the double rollers on the film-drawing axis and the double rollers under the film-drawing axis are respectively a lower curve and an upper curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate from the first side to the second side to support the diaphragm.

5. The motion trajectory control method according to claim 4, characterized in that: After controlling the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the diaphragm buffer roller to move in the first manner, the method includes: When the diaphragm moves from the first side to the first middle position, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in a second manner: the movement trajectories of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis are both translational from the first side to the second side, and the movement trajectory of the diaphragm buffer roller is controlled to translational from the first side to the second side to support the diaphragm.

6. The motion trajectory control method according to claim 5, characterized in that: After controlling the upper double rollers of the film-drawing shaft, the lower double rollers of the film-drawing shaft and the diaphragm buffer roller to move in the second mode, the method includes: When the diaphragm moves from the first middle position to the second middle position, the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are controlled to move in a third manner: the movement trajectory of the double rollers on the film-drawing shaft is vertical upward translation, and the movement trajectory of the double rollers under the film-drawing shaft is vertical downward translation, so that the double rollers on the film-drawing shaft and the double rollers under the film-drawing shaft are restored to the height at the first side.

7. The motion trajectory control method according to claim 6, characterized in that: In the first mode movement and the second mode movement state, the lower end of the diaphragm is connected to the end of the lamination pressing knife close to the first side; In the third moving state, the lamination pressing knife controls the lower end of the diaphragm to move toward the second side, so that the lower end of the diaphragm is connected to the end of the lamination pressing knife close to the second side.

8. The motion trajectory control method according to claim 7, characterized in that: When moving in the first mode, the movement trajectory of the double rollers on the film-drawing shaft is an arc curve with the fixed diaphragm double rollers as the center, and the movement trajectory of the double rollers under the film-drawing shaft is an arc curve with the end of the lamination pressing knife close to the first side as the center.

9. The motion trajectory control method according to claim 3, characterized in that: Also includes: When the diaphragm needs to be moved from the first side to the second side, the diaphragm buffer roller abuts against the diaphragm from a direction close to the first side relative to the diaphragm; When the diaphragm needs to be moved from the second side to the first side, the diaphragm buffer roller abuts against the diaphragm from a direction close to the second side relative to the diaphragm.

10. The motion trajectory control method according to claim 3, characterized in that: Also includes: When the diaphragm needs to be moved from the second side to the first side, the double rollers on the film-pulling axis, the double rollers under the film-pulling axis and the diaphragm buffer roller are controlled to move in the following manner: at least part of the movement trajectory of the double rollers on the film-pulling axis and the double rollers under the film-pulling axis is a curve, and the movement trajectory of the diaphragm buffer roller is controlled to translate in the direction from the second side to the first side to support the diaphragm.

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