Cutting and splicing apparatus, film coating system, and material tape cutting and splicing method

Abstract

The present application pertains to the technical field of batteries, and provides a cutting and splicing apparatus, a film coating system, and a material tape cutting and splicing method. The cutting and splicing apparatus comprises: a first cutting and splicing assembly, the first cutting and splicing assembly comprising a first cutter, a second cutter, and a first pressing member arranged between the first cutter and the second cutter; and a second cutting and splicing assembly, the second cutting and splicing assembly comprising a third cutter, a fourth cutter, and a second pressing member which is arranged between the third cutter and the fourth cutter and faces the first pressing member. The first pressing member and the second pressing member can move towards one another to press a first material tape and a second material tape located between the first pressing member and the second pressing member so as to obtain a spliced material tape. Moreover, the first cutter and the fourth cutter are used for cutting off a material head of the pressed first material tape and a material tail of the second material tape, respectively, and the second cutter and the third cutter are used for cutting off a material tail of the pressed first material tape and a material head of the second material tape, respectively.

Description

Cutting and splicing device, film wrapping system and material strip cutting and splicing method

[0001] Cross-references

[0002] This application refers to Chinese patent application No. 202311277607.X filed on September 28, 2023, entitled “Cutting and splicing device, wrapping system and material strip cutting and splicing method”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a cutting and splicing device for a material strip, a coating system for processing a battery cell, and a material strip cutting and splicing method. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] Coating with blue film is a critical step in the production of power batteries. Blue film, also known as separator, release film, or protective film, can be found in a variety of colors, including red, green, blue, white, and black, and can be either single-sided or double-sided. As an insulating material, blue film separates battery cells, preventing any potential problems with a single cell from affecting other cells.

[0006] Summary of the Invention

[0007] The present application provides a cutting and splicing device for a material strip, a coating system for processing a battery cell, and a material strip cutting and splicing method.

[0008] An embodiment of the first aspect of the present application provides a cutting and splicing device for material strips. The cutting and splicing device includes: a first cutting and splicing assembly, the first cutting and splicing assembly includes a first cutter, a second cutter, and a first pressing member arranged between the first cutter and the second cutter; and a second cutting and splicing assembly, the second cutting and splicing assembly includes a third cutter, a fourth cutter, and a second pressing member arranged between the third cutter and the fourth cutter and facing the first pressing member. The first pressing member and the second pressing member are capable of moving toward each other to press against the first material strip and the second material strip located between the first pressing member and the second pressing member to obtain a spliced ​​material strip, and the first cutter and the fourth cutter are respectively used to cut off the head of the pressed first material strip and the tail of the second material strip, and the second cutter and the third cutter are respectively used to cut off the tail of the pressed first material strip and the head of the second material strip.

[0009] In the technical solution of the embodiment of this application, by pressing the first and second pressing members together and cutting with the first and fourth cutters, or with the second and third cutters, the working and spare strips can be cut and spliced ​​without stopping the equipment. This improves production continuity. In the battery production scenario, it can improve the blue film coating efficiency and battery production efficiency.

[0010] In some embodiments, a first cutter and a second cutter are movably disposed in a first cutting and splicing assembly to score the first material strip, and a third cutter and a fourth cutter are movably disposed in a second cutting and splicing assembly to score the second material strip. Compared to cutting directly against the material strip by the cutter, using the movable cutter to score the pressed material strip increases the probability of severing the material strip, thereby further improving the efficiency of cutting and splicing the material strip.

[0011] In some embodiments, the first cutting and splicing assembly includes a first guide rail, a second guide rail, a first driver, and a second driver, wherein the first driver is used to drive the first cutter to move along the first guide rail, and the second driver is used to drive the second cutter to move along the second guide rail; and wherein the second cutting and splicing assembly includes a third guide rail, a fourth guide rail, a third driver, and a fourth driver, wherein the third driver is used to drive the third cutter to move along the third guide rail, and the fourth driver is used to drive the fourth cutter to move along the fourth guide rail. Thus, the cutter is guided and driven by the guide rail and the driver, and by presetting the positions of the guide rail and the driver, the direction of the cutter's movement can be made more precise, thereby further improving the efficiency of cutting and splicing the material strip. Furthermore, the first cutting and splicing assembly and the second cutting and splicing assembly can adapt to material strips of different specifications (e.g., different widths) to accurately cut material strips of different specifications.

[0012] In some embodiments, the first cutting and splicing assembly further includes a first material strip contact roller disposed between the first pressing member and the first cutter, and a second material strip contact roller disposed between the first pressing member and the second cutter; and the second cutting and splicing assembly further includes a third material strip contact roller disposed between the second pressing member and the third cutter, and a fourth material strip contact roller disposed between the second pressing member and the fourth cutter. By disposing the first material strip contact roller and the second material strip contact roller on both sides of the first pressing member, and disposing the third material strip contact roller and the fourth material strip contact roller on both sides of the second pressing member, the material strips on both sides of the first pressing member and the second pressing member can be guided, thereby reducing friction between the material strip and other components of the first cutting and splicing assembly or the second cutting and splicing assembly, thereby reducing damage to the surface of the material strip.

[0013] In some embodiments, the cutting and splicing device may further include: a first feed roller group and a second feed roller group. The first feed roller group includes: a first main roller for carrying the first material roll to be supplied; and a first material tape passing roller for guiding the first material tape from the first material roll to the first cutting and splicing assembly. The second feed roller group includes: a second main roller for carrying the second material roll to be supplied; and a second material tape passing roller for guiding the second material tape from the second material roll to the second cutting and splicing assembly. By setting the first feed roller group and the second feed roller group, the working material tape and the spare material tape can be placed in the cutting and splicing device 1 at the same time. Thus, when a working material tape is placed in one of the feed roller groups (for example, the first feed roller group), the user can place a spare material tape in the other feed roller group (for example, the second feed roller group) without affecting the normal operation of the working material tape.

[0014] In some embodiments, the first main roller is capable of rotating to at least partially pull the first material strip back from the first cutting and splicing assembly; and the second main roller is capable of rotating to at least partially pull the second material strip back from the second cutting and splicing assembly. Thus, when the first pressing member and the second pressing member are close to each other, the first or second material strip can be at least partially pulled back by rotating the first main roller or the second main roller, so that a portion of the first or second material strip at the starting position can be pulled between the first pressing member and the second pressing member, thereby better pressing this portion of the material strip.

[0015] In some embodiments, the first pressing member and the second pressing member are capable of moving away from each other. When the first pressing member and the second pressing member move away from each other, during the feeding process of the working material strip, the first pressing member or the second pressing member can be prevented from touching the working material strip, thereby performing normal feeding. In addition, during the process of the first main roller or the second main roller rotating to partially pull back the first material strip or the second material strip, the gap provided by the first pressing member and the second pressing member moving away from each other also allows the returned portion of the material strip to pass smoothly between the first pressing member and the second pressing member, thereby reducing excessive friction of the first pressing member 130 and the second pressing member 230 on the returned portion of the material strip.

[0016] In some embodiments, the first feed roller assembly further includes a first release paper recovery roller for pulling the first release paper from the first material roll, and the first material strip roller is configured to guide the first material strip from which the first release paper has been separated to the first cutting and splicing assembly; and the second feed roller assembly includes a second release paper recovery roller for pulling the second release paper from the second material roll, and the second material strip roller is configured to guide the second material strip from which the second release paper has been separated to the second cutting and splicing assembly. By providing the first release paper recovery roller and the second release paper recovery roller, the release paper in the blue film material roll can be recovered, thereby providing the material strip from which the release paper has been separated to the first cutting and splicing assembly and the second cutting and splicing assembly, thereby facilitating better lamination of the first material strip and the second material strip.

[0017] In some embodiments, the first feed roller assembly further includes a first release paper recovery buffer roller, disposed between the first main roller and the first release paper recovery roller, for buffering the movement of the first release paper while the first release paper recovery roller pulls the first release paper from the first material roll. Furthermore, the second feed roller assembly further includes a second release paper recovery buffer roller, disposed between the second main roller and the second release paper recovery roller, for buffering the movement of the second release paper while the second release paper recovery roller pulls the second release paper from the second material roll. When the operating speed of the release paper recovery roller does not match the speed at which the material strip is withdrawn from the material roll, the material strip may tear or accumulate. By setting the first release paper recovery buffer roller and the second release paper recovery buffer roller, when the operating speed of the release paper recovery roller does not match the speed at which the material tape is pulled out from the material roll, the movement of the release paper can be buffered, thereby offsetting the speed difference between the operating speed of the release paper recovery roller and the speed at which the material tape is pulled out from the material roll, making the recovery of the release paper smoother and smoother.

[0018] In some embodiments, the cutting and splicing device further includes a first scrap receiving roller and a second scrap receiving roller, wherein the first scrap receiving roller is used to recover the cut ends of the first material strip, and the second scrap receiving roller is used to recover the cut ends of the second material strip. By providing the first and second scrap receiving rollers, the scrap of the spare material strip can be promptly received after the spare material strip and the working material strip are spliced ​​together and the ends of the spare material strip are cut by the first cutter or the third cutter, thereby preventing the scrap from interfering with or blocking the spliced ​​material strips, thereby further improving production efficiency.

[0019] In some embodiments, the cutting and splicing device further includes a fifth guide rail and a fifth driver, the fifth driver being configured to drive the first cutting and splicing assembly and the second cutting and splicing assembly to move toward or away from each other along the fifth guide rail. Thus, the guide rail and the driver guide and drive the first cutting and splicing assembly and the second cutting and splicing assembly. By presetting the positions of the guide rail and the driver, the direction of movement of the first cutting and splicing assembly and the second cutting and splicing assembly can be made more precise, thereby further improving the efficiency of cutting and splicing the material strip.

[0020] In some embodiments, the cutting and splicing device further includes a deflection correction mechanism mechanically connected to at least one of the first feed roller group and the second feed roller group, for compensating for deviation of the first feed roller group or the second feed roller group during feeding. By providing the deflection correction mechanism, if the first feed roller group or the second feed roller group deviates during operation, the first feed roller group or the second feed roller group can be promptly compensated for the deviation, thereby further improving production efficiency.

[0021] The second aspect of this application provides a coating system for processing battery cells. This coating system includes: a cutting and splicing device according to the first aspect of this application; and a coating device for coating the separator received from the cutting and splicing device on the surface of the battery cell. This allows the cutting and splicing of the working and spare separators to be completed without shutting down the equipment, improving the coating efficiency of the blue film and battery production efficiency.

[0022] A third aspect of the present application provides a method for cutting and splicing a material strip using a cutting and splicing device. The cutting and splicing device includes: a first cutting and splicing assembly, the first cutting and splicing assembly including a first cutter, a second cutter, and a first pressing member disposed between the first and second cutters; and a second cutting and splicing assembly, the second cutting and splicing assembly including a third cutter, a fourth cutter, and a second pressing member disposed between the third and fourth cutters and facing the first pressing member. The method for cutting and splicing the material strip includes: providing a first material strip and a second material strip; controlling the first pressing member and the second pressing member to move toward each other to press against the first and second material strips located between the first pressing member and the second pressing member to form a spliced ​​material strip; and controlling the first and fourth cutters to respectively cut the beginning and end of the pressed first and second material strips, or controlling the second and third cutters to respectively cut the end and beginning of the pressed first and second material strips. Thus, the cutting and splicing of the working and spare material strips can be completed without stopping the equipment, thereby improving production continuity. In the battery production scenario, the blue film coating efficiency and battery production efficiency can be improved.

[0023] In some embodiments, the cutting and splicing device may further include: a first main roller for carrying a first material roll including a first material strip; and a second main roller for carrying a second material roll including a second material strip. And the method may further include: controlling the first pressing member and the second pressing member to move away from each other; and controlling the first main roller to rotate so as to at least partially pull back the first material strip whose material head has been cut off from the first cutting and splicing assembly, or controlling the second main roller to rotate so as to at least partially pull back the second material strip whose material head has been cut off from the second cutting and splicing assembly. Thus, in a scenario where the first pressing member and the second pressing member are close to each other, the first material strip or the second material strip can be at least partially pulled back by rotating the first main roller or the second main roller, so that part of the material strip at the material head position of the first material strip or the second material strip can be pulled between the first pressing member and the second pressing member, so that this part of the material strip can be better pressed together.

[0024] In some embodiments, the cutting and splicing device may further include a first scrap receiving roller and a second scrap receiving roller, and the method may further include: controlling the first scrap receiving roller to rotate to recover the cut ends of the first material strip, or controlling the second scrap receiving roller to rotate to recover the cut ends of the second material strip. Thus, after the spare material strip and the working material strip are spliced ​​together and the ends of the spare material strip are cut by the first cutter or the third cutter, the scrap of the spare material strip can be promptly received, preventing the scrap from interfering with or blocking the spliced ​​material strips, thereby further improving production efficiency.

[0025] In some embodiments, providing the first and second material strips may include: providing the first material strip from which the first release liner is separated; and providing the second material strip from which the second release liner is separated. Thus, in a scenario such as battery production, the release liner in the blue film roll can be recycled, thereby providing the material strip from which the release liner is separated to the first and second cutting and splicing assemblies. The two material strips from which the release liner is separated can be adhered using their adhesive surfaces, thereby facilitating better adhesion of the first and second material strips.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0028] FIG1 is a schematic structural diagram of a cutting and splicing device for a material strip according to some embodiments of the present application;

[0029] 2A and 2B are schematic structural diagrams of a first cutting and splicing assembly of a cutting and splicing device according to some embodiments of the present application;

[0030] 3A and 3B are schematic structural diagrams of a second cutting and splicing assembly of a cutting and splicing device according to some embodiments of the present application;

[0031] 4 to 7 are front views of cutting and splicing devices according to some embodiments of the present application;

[0032] FIG8 is a schematic structural diagram of a first feed roller group of a cutting and splicing device according to some embodiments of the present application;

[0033] FIG9 is a rear view of a cutting and splicing device according to some embodiments of the present application;

[0034] FIG10 is a flow chart of a method for cutting and splicing a material strip using a cutting and splicing device according to some embodiments of the present application; and

[0035] FIG11 is a schematic diagram of a material strip cutting and splicing method according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply 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 a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] As mentioned above, blue film coating is an important process in the production process of power batteries. Blue film (or isolation film) is usually supplied in the form of a roll. By obtaining the blue film from the blue film roll, the blue film is wrapped and coated on the battery cell. In the related art, after the current blue film roll is used up, the coating equipment needs to be shut down, and a new blue film roll is manually replaced, and the blue film tape before replacement is manually spliced ​​together with the blue film tape after replacement to form a continuous tape. After completing the blue film roll changing and splicing work, the coating equipment can be restarted to continue the blue film coating process.

[0045] However, since the coating equipment needs to be shut down, blue film coating cannot be continued during the shutdown process, which affects the continuity of production and reduces the production efficiency of the battery.

[0046] In view of this, the present application provides a cutting and splicing device for material strips and a coating system for processing battery cells.

[0047] The cutting and splicing device disclosed in the embodiment of the present application can be used in battery production, for example, to cut and splice blue film strips for battery cells. In addition, the cutting and splicing device disclosed in the embodiment of the present application can also be applied to other scenarios where cutting and splicing of strips is required to achieve continuous production.

[0048] Embodiments of the present application provide a cutting and splicing device for a material strip. Referring to Figures 1 to 7 , Figure 1 is a schematic structural diagram of a cutting and splicing device for a material strip according to some embodiments of the present application; Figures 2A and 2B are schematic structural diagrams of a first cutting and splicing assembly of the cutting and splicing device according to some embodiments of the present application; Figures 3A and 3B are schematic structural diagrams of a second cutting and splicing assembly of the cutting and splicing device according to some embodiments of the present application; and Figures 4 to 7 are front views of the cutting and splicing device according to some embodiments of the present application.

[0049] First, as shown in FIG1 , the cutting and splicing device 1 includes a first cutting and splicing component 100 and a second cutting and splicing component 200 .

[0050] 2A and 2B , the first cutting and splicing assembly 100 includes a first cutter 110 , a second cutter 120 , and a first pressing member 130 disposed between the first cutter 110 and the second cutter 120 .

[0051] 3A and 3B , the second cutting and splicing assembly 200 includes a third cutter 210 , a fourth cutter 220 , and a second pressing member 230 disposed between the third cutter 210 and the fourth cutter 220 and facing the first pressing member 130 .

[0052] The first pressing member 130 and the second pressing member 230 are movable toward each other to press the first material strip 901 and the second material strip 902 located between the first pressing member 130 and the second pressing member 230 to form a spliced ​​material strip. The first cutter 110 and the fourth cutter 220 are respectively used to cut off the beginning of the first material strip 901 and the end of the second material strip 902 that have been pressed against each other. The second cutter 120 and the third cutter 210 are respectively used to cut off the end of the first material strip 901 and the beginning of the second material strip 902 that have been pressed against each other.

[0053] The first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 in the cutting and splicing device 1 can be arranged opposite each other. Furthermore, the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can have symmetrical structures. For example, the first pressing member 130 and the second pressing member 230 can have the same shape and can be arranged opposite each other. Furthermore, the first cutter 110 can be arranged opposite the third cutter 210, and the second cutter 120 can be arranged opposite the fourth cutter 220.

[0054] Referring to FIG. 4 , in FIG. 4 , the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 are separated by a distance. In this case, the first material strip 901 and the second material strip 902 passing between the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can be free from interference with each other. Furthermore, in the example shown in FIG. 4 , the first material strip 901 can be used as a working material strip and guided out of the output roller 710 of the cutting and splicing device 1; while the second material strip 902 can be used as a spare material strip and temporarily not come into contact with the output roller 710. Continuing to refer to FIG. 5 , the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can be moved toward each other, thereby enabling the first pressing member 130 and the second pressing member 230 to move toward each other to press against the first material strip 901 and the second material strip 902 located between the first pressing member 130 and the second pressing member 230 to obtain a spliced ​​material strip. When the first pressing member 130 and the second pressing member 230 move toward each other and contact each other, the first material strip 901 and the second material strip 902 can be pressed together. In an example, the surfaces of the first material strip 901 and the second material strip 902 to be in contact with each other can be provided with adhesive to promote adhesion between the two.

[0055] 2A to 3B and 5 , the second cutter 120 and the third cutter 210 are respectively used to cut off the tail of the pressed first material strip 901 and the beginning of the second material strip 902. That is, in FIG5 , the second cutter 120 located at the bottom of the first cutting and splicing assembly 100 is used to cut off the tail of the pressed first material strip 901 (i.e., the position of the first material strip 901 located below the first cutting and splicing assembly 100 in FIG5 ); correspondingly, the third cutter 210 located at the top of the second cutting and splicing assembly 200 is used to cut off the beginning of the pressed second material strip 902 (i.e., the position of the second material strip 902 located above the second cutting and splicing assembly 200 in FIG5 ). Therefore, when the working material tape (first material tape 901) is about to be exhausted, the first material tape 901 is disconnected from its tail position by pressing the first pressing member 130 and the second pressing member 230, and by the cooperation of the second cutter 120 and the third cutter 210; and the spare material tape (second material tape 902) is disconnected from its head position, and the remaining part of the second material tape 902 is spliced ​​onto the current working material tape, so that the cutting and splicing of the working material tape and the spare material tape can be completed without stopping the equipment.

[0056] Figures 6 and 7 illustrate situations similar to Figures 4 and 5. As shown in Figure 6, the second material strip 902 can be used as a working material strip and be output from the output roller 710 of the cutting and splicing device 1; while the first material strip 901 can be used as a spare material strip and temporarily not come into contact with the output roller 710. Continuing with reference to Figure 7, the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can move toward each other, whereby the first pressing member 130 and the second pressing member 230 can move toward each other to press against the first material strip 901 and the second material strip 902 located between the first pressing member 130 and the second pressing member 230 to obtain a spliced ​​material strip. When the first pressing member 130 and the second pressing member 230 move toward each other and contact each other, the first material strip 901 and the second material strip 902 can be pressed together.

[0057] 2A to 3B and 7 , the first cutter 110 and the fourth cutter 220 are respectively used to cut off the beginning of the pressed first material strip 901 and the end of the second material strip 902. That is, in FIG7 , the first cutter 110 located at the upper portion of the first cutting and splicing assembly 100 is used to cut off the beginning of the pressed first material strip 901 (i.e., the position of the first material strip 901 located above the first cutting and splicing assembly 100 in FIG7 ); correspondingly, the fourth cutter 220 located at the lower portion of the second cutting and splicing assembly 200 is used to cut off the end of the pressed second material strip 902 (i.e., the position of the second material strip 902 located below the second cutting and splicing assembly 200 in FIG7 ). Therefore, when the working material tape (second material tape 902) is about to be exhausted, the second material tape 902 is disconnected from its tail position by pressing the first pressing member 130 and the second pressing member 230, and by the cooperation of the first cutter 110 and the fourth cutter 220; and the spare material tape (first material tape 901) is disconnected from its head position, and the remaining part of the first material tape 901 is spliced ​​onto the current working material tape, so that the cutting and splicing of the working material tape and the spare material tape can be completed without stopping the equipment.

[0058] In an example, the first material strip 901 and the second material strip 902 may be blue films (isolation films) for wrapping battery cells.

[0059] Thus, through the pressing of the first pressing member 130 and the second pressing member 230, and the coordinated cutting of the first cutter 110 and the fourth cutter 220, or the coordinated cutting of the second cutter 120 and the third cutter 210, the working and spare strips can be cut and spliced ​​without stopping the equipment. This improves production continuity. In battery production scenarios, it can improve the blue film coating efficiency and battery production efficiency.

[0060] According to some embodiments of the present application, the first cutter 110 and the second cutter 120 can be movably set in the first cutting and splicing assembly 100 to cut the first material strip 901, and the third cutter 210 and the fourth cutter 220 can be movably set in the second cutting and splicing assembly 200 to cut the second material strip 902.

[0061] For example, in Figures 4 to 7, the first cutter 110 and the second cutter 120 can be configured to move perpendicular to the XZ plane, so that the first material strip 901 can be cut along the direction shown by Y in Figure 1. The third cutter 210 and the fourth cutter 220 can also be configured to move perpendicular to the XZ plane, so that the second material strip 902 can be cut along the direction shown by Y in Figure 1.

[0062] In this example, the first cutter 110, the second cutter 120, the third cutter 210, and the fourth cutter 220 can each have a single-sided blade or a double-sided blade. For example, the first cutter 110, the second cutter 120, the third cutter 210, and the fourth cutter 220 can each have a single-sided blade, and the cutter can move from one side of the material strip to the other side of the material strip, for example, perpendicular to the XZ plane, to cut the corresponding material strip. When the cutter has a double-sided blade, the starting cutting position of the cutter can be set more flexibly.

[0063] Therefore, compared with the cutter directly cutting against the material strip along the X direction in Figure 4, for example, the movable cutter cuts the pressed material strip by swiping, which can increase the probability of cutting the material strip, thereby further improving the cutting and splicing efficiency of the material strip.

[0064] According to some embodiments of the present application, with continued reference to FIG2B , the first cutting and splicing assembly 100 may include a first guide rail 130, a second guide rail 140, a first driver 150, and a second driver 160. The first driver 150 is used to drive the first cutter 110 to move along the first guide rail 130, and the second driver 160 is used to drive the second cutter 120 to move along the second guide rail 140. Furthermore, with continued reference to FIG3B , the second cutting and splicing assembly 200 may include a third guide rail 230, a fourth guide rail 240, a third driver 250, and a fourth driver 260. The third driver 250 is used to drive the third cutter 210 to move along the third guide rail 230, and the fourth driver 260 is used to drive the fourth cutter 220 to move along the fourth guide rail 240.

[0065] The first guide rail 130, the second guide rail 140, the third guide rail 230, and the fourth guide rail 240 may be linear guide rails, and the first guide rail 130, the second guide rail 140, the third guide rail 230, and the fourth guide rail 240 may be arranged along the Y direction in FIG. 1 so that the corresponding cutter can move along this direction. The first drive 150, the second drive 160, the third drive 250, and the fourth drive 260 may each be a linear motor, a pneumatic element (e.g., a cylinder), or a screw drive mechanism.

[0066] Thus, the cutter is guided and driven by the guide rail and the driver. By presetting the positions of the guide rail and the driver, the direction of the cutter's movement can be made more precise, further improving the efficiency of cutting and splicing the material strips. Furthermore, the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can adapt to material strips of different specifications (e.g., different widths) to accurately cut material strips of different specifications.

[0067] According to some embodiments of the present application, with continued reference to FIG2A , the first cutting and splicing assembly 100 may further include a first material contact roller 170 disposed between the first pressing member 130 and the first cutter 110, and a second material contact roller 180 disposed between the first pressing member 130 and the second cutter 120. Furthermore, with continued reference to FIG3A , the second cutting and splicing assembly 200 may further include a third material contact roller 270 disposed between the second pressing member 230 and the third cutter 210, and a fourth material contact roller 280 disposed between the second pressing member 230 and the fourth cutter 220.

[0068] In the example, the surface materials of the first material strip contact roller 170 , the second material strip contact roller 180 , the third material strip contact roller 270 and the fourth material strip contact roller 280 may have a preset friction force for guiding the material strips on both sides of the first pressing member 130 and the second pressing member 230 .

[0069] In the example, the outermost surfaces of the first and second material contact rollers 170 and 180 can be flush with the front surfaces of the corresponding first pressing members 130; and the outermost surfaces of the third and fourth material contact rollers 270 and 280 can be flush with the front surfaces of the corresponding second pressing members 230.

[0070] By arranging a first material strip contact roller 170 and a second material strip contact roller 180 on both sides of the first pressing member 130, and arranging a third material strip contact roller 270 and a fourth material strip contact roller 280 on both sides of the second pressing member 230, the material strips on both sides of the first pressing member 130 and the second pressing member 230 can be guided, thereby reducing the friction between the material strip and other components of the first cutting and splicing assembly 100 or the second cutting and splicing assembly 200, thereby reducing damage to the surface of the material strip.

[0071] According to some embodiments of the present application, with continued reference to FIG. 1 , the cutting and splicing device 1 may further include: a first feed roller group 300 and a second feed roller group 400 .

[0072] The first feed roller set 300 includes: a first main roller 310 for carrying the first material roll to be supplied; and a first material strip passing roller 320 for guiding the first material strip from the first material roll to the first cutting and splicing assembly 100 .

[0073] The second feed roller set 400 may include: a second main roller 410 for carrying the second material roll to be supplied; and a second material strip passing roller 420 for guiding the second material strip from the second material roll to the second cutting and splicing assembly 200 .

[0074] In this example, a first main roller 310 and a second main roller 410 can be mounted on a bracket, respectively, to carry the first and second material rolls to be supplied. A first material strip passing roller 320 can be disposed between the first main roller 310 and the first cutting and splicing assembly 100 to guide the first material strip from the first material roll to the first cutting and splicing assembly 100; a second material strip passing roller 420 can be disposed between the second main roller 410 and the second cutting and splicing assembly 200 to guide the second material strip from the second material roll to the second cutting and splicing assembly 200.

[0075] It will be understood that the number of the first feed roller 320 and the second feed roller 420 may be more than one. For example, the first feed roller set 300 may include a plurality of first feed rollers 320 , and the second feed roller set 400 may include a plurality of second feed rollers 420 .

[0076] By setting up the first feed roller group 300 and the second feed roller group 400, the working material tape and the spare material tape can be placed in the cutting and splicing device 1 at the same time. Thus, when the working material tape is placed in one of the feed roller groups (for example, the first feed roller group 300), the user can place the spare material tape into the other feed roller group (for example, the second feed roller group 400) without affecting the normal operation of the working material tape.

[0077] According to some embodiments of the present application, the first main roller 310 is rotatable to at least partially pull the first material tape back from the first cutting and splicing assembly 100 ; and the second main roller 410 is rotatable to at least partially pull the second material tape back from the second cutting and splicing assembly 200 .

[0078] When the material belt (e.g., the first material belt 901) is being fed, the pulled material belt can drive the main roller (e.g., the first main roller 310) to rotate due to the traction of the rear equipment. For example, in the example of FIG4 , the pulled first material belt 901 can drive the first main roller 310 to rotate clockwise.

[0079] Accordingly, in the example, the first main roller 310 can rotate to at least partially pull the first material strip 901 back from the first cutting and splicing assembly 100, which means that the first main roller 310 can actively rotate counterclockwise to pull the first material strip 901 back from the first cutting and splicing assembly 100 to the material roll.

[0080] Similarly, in the example, the second main roller 410 can actively rotate counterclockwise to pull the second material strip from the second cutting and splicing assembly 200 back to the material roll.

[0081] Thus, in a scenario where the first pressing member 130 and the second pressing member 230 are close to each other, as shown in Figures 5 and 7, the first material tape or the second material tape can be at least partially pulled back by rotating the first main roller 310 or the second main roller 410, so that part of the material tape at the material head position of the first material tape or the second material tape (for example, the position of the first material tape or the second material tape above the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 in Figure 5 or 7) can be pulled between the first pressing member 130 and the second pressing member 230, so that this part of the material tape can be better pressed.

[0082] According to some embodiments of the present application, the first pressing member 130 and the second pressing member 230 are capable of moving away from each other.

[0083] 4 and 5 , the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 can both be moved from the position shown in FIG. 5 to the position shown in FIG. 4 , thereby enabling the first pressing member 130 and the second pressing member 230 to move away from each other.

[0084] When the first pressing member 130 and the second pressing member 230 move away from each other, during the feeding process of the working material strip, the first pressing member 130 or the second pressing member 230 can be prevented from contacting the working material strip, thereby allowing normal feeding. In addition, during the process of the first main roller 310 or the second main roller 410 rotating to partially retract the first material strip or the second material strip, the gap between the first pressing member 130 and the second pressing member 230 formed by the movement of the first pressing member 130 and the second pressing member 230 also allows the retracted portion of the material strip to pass smoothly between the first pressing member 130 and the second pressing member 230, thereby reducing excessive friction between the first pressing member 130 and the second pressing member 230 and the retracted portion of the material strip.

[0085] According to some embodiments of the present application, with continued reference to Figure 1, the first feed roller group 300 may further include a first release paper recovery roller 330 for pulling out the first release paper from the first material roll, and the first material tape roller 320 may be configured to guide the first material tape from which the first release paper has been separated to the first cutting and splicing assembly 100; and the second feed roller group 400 may include a second release paper recovery roller 430 for pulling out the second release paper from the second material roll, and the second material tape roller 420 may be configured to guide the second material tape from which the second release paper has been separated to the second cutting and splicing assembly 200.

[0086] For example, in the scenario of blue film coating, the blue film in the roll is usually covered with a layer of release paper. The release paper is used to cover the side surface with adhesive on the blue film tape. After tearing off the release paper, the side surface with adhesive on the blue film tape can be exposed, and the adhesive is conducive to better coating the blue film on the battery cell.

[0087] In an example, the first release paper recovery roller 330 and the second release paper recovery roller 430 may be driven to rotate by a motor to actively collect the release paper.

[0088] By setting the first release paper recovery roller 330 and the second release paper recovery roller 430, the release paper in the blue film roll can be recovered, thereby providing the first cutting and splicing component 100 and the second cutting and splicing component 200 with a material strip with the release paper separated. The two material strips with the release paper separated can be pasted together through their adhesive surfaces, thereby facilitating better fitting of the first material strip and the second material strip.

[0089] According to some embodiments of the present application, with continued reference to FIG1 , the first feed roller assembly 300 may further include a first release paper recovery buffer roller 340, which is disposed between the first main roller 310 and the first release paper recovery roller 330 and is configured to buffer the movement of the first release paper while the first release paper recovery roller 330 is pulling the first release paper from the first material roll. Furthermore, the second feed roller assembly 400 may further include a second release paper recovery buffer roller 440, which is disposed between the second main roller 410 and the second release paper recovery roller 430 and is configured to buffer the movement of the second release paper while the second release paper recovery roller 430 is pulling the second release paper from the second material roll.

[0090] In some embodiments, the first release paper recovery buffer roller 340 and the second release paper recovery buffer roller 440 can be elastically mounted on the bracket (e.g., via a spring or damper). Figure 8 is a schematic diagram of the structure of the first feed roller assembly of the cutting and splicing device in some embodiments of the present application. As shown in Figure 8, the first release paper recovery buffer roller 340 can be mounted on the bracket via a spring mechanism 341.

[0091] When the speed of the release paper recovery roller does not match the speed at which the strip is drawn from the roll, the strip may tear or accumulate. By providing the first release paper recovery buffer roller 340 and the second release paper recovery buffer roller 440, when the speed of the release paper recovery roller does not match the speed at which the strip is drawn from the roll, the movement of the release paper can be buffered, thereby offsetting the speed difference between the speed of the release paper recovery roller and the speed at which the strip is drawn from the roll, making the release paper recovery smoother and more stable.

[0092] According to some embodiments of the present application, with continued reference to FIG1 , the cutting and splicing device 1 may further include a first waste material receiving roller 500 and a second waste material receiving roller 600 , wherein the first waste material receiving roller 500 is used to recover the head of the cut first material strip, and the second waste material receiving roller 600 is used to recover the head of the cut second material strip.

[0093] As shown in Figures 1 and 4 to 7, the first scrap receiving roller 500 can be disposed on the first cutting and splicing assembly 100. In other words, the first cutting and splicing assembly 100 can be disposed between the first scrap receiving roller 500 and the first feed roller set 300. Similarly, the second scrap receiving roller 600 can be disposed on the second cutting and splicing assembly 200. In other words, the second cutting and splicing assembly 200 can be disposed between the second scrap receiving roller 600 and the second feed roller set 400.

[0094] In an example, the first remnant receiving roller 500 and the second remnant receiving roller 600 may be driven to rotate by a motor to actively collect remnants of the first material strip or the second material strip.

[0095] By setting up the first residual material receiving roller 500 and the second residual material receiving roller 600, the residual material of the spare material strip can be received in time after the spare material strip and the working material strip are spliced ​​and the material head of the spare material strip is cut off by the first cutter 110 or the third cutter 210, so as to prevent the residual material from interfering with or blocking the spliced ​​material strip, thereby further improving production efficiency.

[0096] It will be understood that the number of rollers in the first feed roller group 300 and the second feed roller group 400 in the above embodiment can be adjusted as needed. In addition, the first scrap receiving roller 500 in the above embodiment can also include multiple scrap receiving rollers, and the second scrap receiving roller 600 can also include multiple scrap receiving rollers.

[0097] According to some embodiments of the present application, referring to FIG9 , which is a rear view of the cutting and splicing device of some embodiments of the present application, the cutting and splicing device 1 may further include a fifth guide rail 720 and a fifth driver 730 , wherein the fifth driver 730 is configured to drive the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 to move toward or away from each other along the fifth guide rail 720 .

[0098] In an example, the fifth actuator 730 can be a linear motor, a pneumatic element (e.g., a cylinder), or a screw drive mechanism. A portion of the fifth actuator 730 can be fixed to a bracket, and another portion of the fifth actuator 730 can be connected to the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200, respectively. Furthermore, there can be one, two, or more fifth actuators 730. The example of FIG. 9 shows two fifth actuators 730. Furthermore, the fifth guide rail 720 can be arranged along the X direction as shown in FIG. 9 .

[0099] Therefore, the first cutting and splicing component 100 and the second cutting and splicing component 200 are guided and driven by the guide rails and the driver. By pre-setting the positions of the guide rails and the driver, the movement directions of the first cutting and splicing component 100 and the second cutting and splicing component 200 can be made more precise, thereby further improving the cutting and splicing efficiency of the material strip.

[0100] According to some embodiments of the present application, as shown in Figures 1 and 9, the cutting and splicing device 1 may further include a correction mechanism 800, which is mechanically connected to at least one of the first feed roller group 300 and the second feed roller group 400, and is used to compensate for the offset of the first feed roller group 300 or the second feed roller group 400 during feeding.

[0101] In an example, two correcting mechanisms 800 may be provided, one correcting mechanism 800 being used to connect with the first feed roller set 300 , and the other correcting mechanism 800 being used to connect with the second feed roller set 400 .

[0102] By setting up the correction mechanism 800, when the first feed roller group 300 or the second feed roller group 400 has a belt deviation during operation, the first feed roller group 300 or the second feed roller group 400 can be promptly compensated for the deviation, thereby further improving production efficiency.

[0103] The embodiment of the present application provides a coating system for processing battery cells (not shown in the figure). The coating system includes: a cutting and splicing device 1 and a coating device, which is used to coat the separator received from the cutting and splicing device 1 on the surface of the battery cell.

[0104] The wrapping device can be arranged close to the cutting and splicing device 1 and can receive the spliced ​​material strips from the output roller 710 of the cutting and splicing device 1 .

[0105] Therefore, by pressing the first pressing member 130 and the second pressing member 230, and by the coordinated cutting of the first cutter 110 and the fourth cutter 220, or by the coordinated cutting of the second cutter 120 and the third cutter 210, the cutting and splicing of the working diaphragm and the spare diaphragm can be completed without stopping the equipment, which can improve the blue film coating efficiency and the battery production efficiency.

[0106] The present invention provides a method for cutting and splicing a material strip using a cutting and splicing device. The cutting and splicing device includes: a first cutting and splicing assembly, the first cutting and splicing assembly including a first cutter, a second cutter, and a first pressing member disposed between the first and second cutters; and a second cutting and splicing assembly, the second cutting and splicing assembly including a third cutter, a fourth cutter, and a second pressing member disposed between the third and fourth cutters and facing the first pressing member.

[0107] FIG10 is a flow chart of a method 1000 for cutting and splicing a material strip using a cutting and splicing device according to some embodiments of the present application. As shown in FIG10 , the method 1000 includes:

[0108] Step S1001: providing a first material strip and a second material strip;

[0109] Step S1002: Control the first pressing member and the second pressing member to move toward each other to press the first material strip and the second material strip located between the first pressing member and the second pressing member to obtain a spliced ​​material strip; and

[0110] Step S1003: Control the first cutter and the fourth cutter to cut off the head of the pressed first material strip and the tail of the second material strip respectively, or control the second cutter and the third cutter to cut off the tail of the pressed first material strip and the head of the second material strip respectively.

[0111] In an example, the method 1000 may be performed using the cutting and splicing apparatus described above with respect to FIG. 1 to FIG. 9 .

[0112] For example, in the examples shown in Figures 4 to 5, the first material tape 901 provided can be used as a working material tape, and the second material tape 902 provided can be used as a spare material tape. When the first material tape 901 is about to be exhausted, the first pressing member and the second pressing member move toward each other to press the first material tape and the second material tape located between the first pressing member and the second pressing member to obtain a spliced ​​material tape. Through the coordinated cutting of the second cutter 120 and the third cutter 210, the first material tape 901 is disconnected from its tail position; and the spare material tape (second material tape 902) is disconnected from its head position, and the rest of the second material tape 902 is spliced ​​onto the current working material tape, so that the cutting and splicing of the working material tape and the spare material tape can be completed without stopping the equipment.

[0113] For another example, in the examples shown in Figures 6 to 7, the first material tape 901 provided can be used as a spare material tape, and the second material tape 902 provided can be used as a working material tape. When the working material tape (second material tape 902) is about to be exhausted, the first pressing member and the second pressing member move toward each other to press the first material tape and the second material tape located between the first pressing member and the second pressing member to obtain a spliced ​​material tape. Through the coordinated cutting of the first cutter 110 and the fourth cutter 220, the second material tape 902 is disconnected from its tail position; and the spare material tape (first material tape 901) is disconnected from its head position, and the rest of the first material tape 901 is spliced ​​onto the current working material tape, so that the cutting and splicing of the working material tape and the spare material tape can be completed without stopping the equipment.

[0114] This allows the cutting and splicing of working and backup strips to be completed without stopping the equipment, improving production continuity. In battery production scenarios, this can improve the efficiency of blue film coating and battery production.

[0115] According to some embodiments of the present application, the cutting and splicing device may further include: a first main roller for carrying a first material roll including a first material strip; and a second main roller for carrying a second material roll including a second material strip. In addition, the method 1000 may further include:

[0116] controlling the first pressing member and the second pressing member to move away from each other; and

[0117] The first main roller is controlled to rotate to at least partially pull the first material strip having the cut ends back from the first cutting and splicing assembly, or the second main roller is controlled to rotate to at least partially pull the second material strip having the cut ends back from the second cutting and splicing assembly.

[0118] In an example, the first main roller may include the first main roller 310 described above, and the second main roller may include the second main roller 410 described above.

[0119] Thus, in a scenario where the first pressing member and the second pressing member are close to each other, the first material strip or the second material strip can be at least partially pulled back by the rotation of the first main roller or the second main roller, so that part of the material strip at the head position of the first material strip or the second material strip can be pulled between the first pressing member and the second pressing member, so that this part of the material strip can be better pressed. In addition, since the first pressing member and the second pressing member move away from each other, during the process of the first main roller or the second main roller rotating to partially pull back the first material strip or the second material strip, the gap between the first pressing member and the second pressing member moving away from each other also allows the returned part of the material strip to pass smoothly between the first pressing member and the second pressing member, thereby reducing excessive friction of the first pressing member 130 and the second pressing member 230 on the returned part of the material strip.

[0120] According to some embodiments of the present application, the cutting and splicing device may further include a first scrap receiving roller and a second scrap receiving roller. In addition, method 1000 may further include: controlling the first scrap receiving roller to rotate to recover the cut ends of the first material strip, or controlling the second scrap receiving roller to rotate to recover the cut ends of the second material strip.

[0121] In an example, the first remnant receiving roller may include the first remnant receiving roller 500 described above, and the second remnant receiving roller may include the second remnant receiving roller 600 described above.

[0122] In this way, after the spare material tape and the working material tape are spliced ​​together and the material head of the spare material tape is cut off by the first cutter 110 or the third cutter 210, the remaining material of the spare material tape can be received in time to prevent the remaining material from interfering with or blocking the spliced ​​material tape, thereby further improving production efficiency.

[0123] According to some embodiments of the present application, step S1001 may include: providing a first material strip from which a first release liner has been separated; and providing a second material strip from which a second release liner has been separated. Thus, in a scenario such as battery production, the release liner in the blue film roll can be recycled, thereby providing the material strip from which the release liner has been separated to the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200. The two material strips from which the release liner has been separated can be adhered using their adhesive surfaces, thereby facilitating better bonding of the first and second material strips.

[0124] The technical solution of this application is further illustrated below through a specific embodiment.

[0125] As shown in Figures 1 to 9, the cutting and splicing device 1 includes: a first cutting and splicing assembly 100 and a second cutting and splicing assembly 200. The first cutting and splicing assembly 100 includes a movable first cutter 110, a second cutter 120, and a first pressing member 130 disposed between the first cutter 110 and the second cutter 120. The second cutting and splicing assembly 200 includes a movable third cutter 210, a fourth cutter 220, and a second pressing member 230 disposed between the third cutter 210 and the fourth cutter 220 and facing the first pressing member 130.

[0126] The cutting and splicing device 1 further includes a fifth guide rail 720 and a fifth driver 730. The fifth driver 730 is used to drive the first cutting and splicing assembly 100 and the second cutting and splicing assembly 200 to move toward or away from each other along the fifth guide rail 720. The cutting and splicing device 1 further includes a deviation correction mechanism 800. The deviation correction mechanism 800 is mechanically connected to at least one of the first feed roller group 300 and the second feed roller group 400, and is used to compensate for the deviation of the first feed roller group 300 or the second feed roller group 400 during feeding.

[0127] Under the action of the fifth driver 730, the first pressing member 130 and the second pressing member 230 can move toward each other to press the first material strip 901 and the second material strip 902 located between the first pressing member 130 and the second pressing member 230 to obtain a spliced ​​material strip. The first cutter 110 and the fourth cutter 220 are respectively used to slide and cut the beginning of the first material strip 901 and the end of the second material strip 902 that have been pressed against each other. The second cutter 120 and the third cutter 210 are respectively used to slide and cut the end of the first material strip 901 and the beginning of the second material strip 902 that have been pressed against each other.

[0128] The first cutting and splicing assembly 100 includes a first guide rail 130, a second guide rail 140, a first driver 150, and a second driver 160. The first driver 150 is used to drive the first cutter 110 to move along the first guide rail 130, and the second driver 160 is used to drive the second cutter 120 to move along the second guide rail 140. The second cutting and splicing assembly 200 may include a third guide rail 230, a fourth guide rail 240, a third driver 250, and a fourth driver 260. The third driver 250 is used to drive the third cutter 210 to move along the third guide rail 230, and the fourth driver 260 is used to drive the fourth cutter 220 to move along the fourth guide rail 240.

[0129] The first cutting and splicing assembly 100 further includes a first material strip contact roller 170 disposed between the first pressing member 130 and the first cutter 110, and a second material strip contact roller 180 disposed between the first pressing member 130 and the second cutter 120. The second cutting and splicing assembly 200 may further include a third material strip contact roller 270 disposed between the second pressing member 230 and the third cutter 210, and a fourth material strip contact roller 280 disposed between the second pressing member 230 and the fourth cutter 220.

[0130] In addition, the cutting and splicing device 1 further includes: a first feed roller group 300 and a second feed roller group 400 .

[0131] The first feed roller group 300 includes: a first main roller 310 for carrying the first material roll to be supplied; and a first material tape passing roller 320 for guiding the first material tape from the first material roll to the first cutting and splicing assembly 100; the first feed roller group 300 also includes a first release paper recovery roller 330 for pulling out the first release paper from the first material roll, and the first material tape passing roller 320 can be configured to guide the first material tape from which the first release paper has been separated to the first cutting and splicing assembly 100; the first feed roller group 300 also includes a first release paper recovery buffer roller 340, which is arranged between the first main roller 310 and the first release paper recovery roller 330, and is used to buffer the movement of the first release paper during the period when the first release paper recovery roller 330 pulls the first release paper out from the first material roll.

[0132] The second feed roller assembly 400 includes: a second main roller 410 for carrying the second material roll to be supplied; and a second material strip passing roller 420 for guiding the second material strip from the second material roll to the second cutting and splicing assembly 200; and the second feed roller assembly 400 may include a second release paper recovery roller 430 for pulling the second release paper from the second material roll, and the second material strip passing roller 420 may be configured to guide the second material strip separated from the second release paper to the second cutting and splicing assembly 200. The second feed roller assembly 400 also includes a second release paper recovery buffer roller 440, which is disposed between the second main roller 410 and the second release paper recovery roller 430 and is configured to buffer the movement of the second release paper during the period when the second release paper recovery roller 430 pulls the second release paper from the second material roll.

[0133] Furthermore, the first main roller 310 can rotate to at least partially pull the first material strip back from the first cutting and splicing assembly 100, and the second main roller 410 can rotate to at least partially pull the second material strip back from the second cutting and splicing assembly 200. The first pressing member 130 and the second pressing member 230 can move away from each other.

[0134] The cutting and splicing device 1 further includes a first residual material receiving roller 500 and a second residual material receiving roller 600. The first residual material receiving roller 500 is used to recover the cut ends of the first material strip, and the second residual material receiving roller 600 is used to recover the cut ends of the second material strip.

[0135] Furthermore, referring to Figure 11 , which is a schematic diagram illustrating a method for cutting and splicing a material strip according to an embodiment of the present application, a first material strip 1101 and a second material strip 1102 can be provided. As shown in state A in Figure 11 , first material strip 1101 can be directed from output roller 1110 of the cutting and splicing apparatus as a working material strip, while second material strip 1102 can be temporarily wound around second excess material receiving roller 1120 as a backup material strip.

[0136] As shown in state B in FIG11 , when the working tape (first tape 1101) is about to be exhausted, the first pressing member and the second pressing member move toward each other to press the first tape 1101 and the second tape 1102 located between the first pressing member and the second pressing member to obtain a spliced ​​tape. Then, as shown in state C in FIG11 , the first tape 1101 is cut off from its tail position by the cooperation of the second cutter and the third cutter; and the spare tape (second tape 1102) is cut off from its head position, and the rest of the second tape 1102 is spliced ​​onto the current working tape, thereby completing the cutting and splicing of the working tape and the spare tape without stopping the equipment. Then, as shown in state D in FIG11 , the second residual material receiving roller 1120 rotates to recover the head of the cut second tape 1102. In addition, as shown in state E of Figure 11, the first pressing member and the second pressing member are controlled to move away from each other, and the second main roller 1130 is controlled to rotate to pull back the second material strip 1102 whose material head has been cut off from the second cutting and splicing assembly at least partially, so that this part of the second material strip can be better spliced ​​with the first material strip. Subsequently, as shown in states F and G of Figure 11, the spliced ​​second material strip 1102 can continue to be exported through the output roller 1110, and the first pressing member and the second pressing member are further moved away from each other. In this way, the cutting and splicing of the working material strip and the spare material strip can be completed without stopping the equipment. This improves the continuity of production. In the scenario of battery production, the coating efficiency of the blue film and the production efficiency of the battery can be improved.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cutting and splicing device for a material strip, comprising: A first cutting and splicing assembly, the first cutting and splicing assembly comprising a first cutting knife, a second cutting knife and a first pressing member arranged between the first cutting knife and the second cutting knife; and a second cutting and splicing assembly, the second cutting and splicing assembly comprising a third cutter, a fourth cutter, and a second pressing member disposed between the third cutter and the fourth cutter and facing the first pressing member, The first pressing member and the second pressing member are movable toward each other to press against the first material strip and the second material strip located between the first pressing member and the second pressing member to obtain a spliced ​​material strip, and The first cutter and the fourth cutter are used to cut off the head of the first material strip and the tail of the second material strip respectively, and the second cutter and the third cutter are used to cut off the tail of the first material strip and the head of the second material strip respectively.

2. The cutting and splicing device according to claim 1, wherein: The first cutter and the second cutter are movably arranged in the first cutting and splicing assembly to cut the first material strip, and the third cutter and the fourth cutter are movably arranged in the second cutting and splicing assembly to cut the second material strip.

3. The cutting and splicing device according to claim 2, wherein: The first cutting and splicing assembly includes a first guide rail, a second guide rail, a first driver and a second driver, the first driver is used to drive the first cutter to move along the first guide rail, and the second driver is used to drive the second cutter to move along the second guide rail; and wherein, the second cutting and splicing assembly includes a third guide rail, a fourth guide rail, a third driver and a fourth driver, the third driver is used to drive the third cutter to move along the third guide rail, and the fourth driver is used to drive the fourth cutter to move along the fourth guide rail.

4. The cutting and splicing device according to any one of claims 1 to 3, wherein: The first cutting and splicing assembly also includes a first material tape contact roller arranged between the first pressing member and the first cutting knife, and a second material tape contact roller arranged between the first pressing member and the second cutting knife; and the second cutting and splicing assembly also includes a third material tape contact roller arranged between the second pressing member and the third cutting knife, and a fourth material tape contact roller arranged between the second pressing member and the fourth cutting knife.

5. The cutting and splicing device according to any one of claims 1 to 4, wherein: The cutting and splicing device also includes: A first feed roller set, the first feed roller set comprising: A first main roller for carrying a first material roll to be supplied; and A first material tape passing roller, used for guiding the first material tape from the first material roll to the first cutting and splicing assembly; and A second feed roller set, the second feed roller set comprising: A second main roller for carrying a second material roll to be supplied; and The second material tape passing roller is used for guiding the second material tape from the second material roll to the second cutting and splicing assembly.

6. The cutting and splicing device according to claim 5, wherein: The first main roller is rotatable to at least partially pull the first material strip back from the first cutting and splicing assembly; and wherein the second main roller is rotatable to at least partially pull the second material strip back from the second cutting and splicing assembly.

7. The cutting and splicing device according to claim 6, wherein: The first abutment member and the second abutment member are movable away from each other.

8. The cutting and splicing device according to claim 5, wherein: The first feed roller group further includes a first release paper recovery roller for pulling out the first release paper from the first material roll, and the first material strip passing roller is configured to guide the first material strip separated from the first release paper to the first cutting and splicing assembly; and The second feed roller group includes a second release paper recovery roller for pulling out the second release paper from the second material roll, and the second material tape passing roller is configured to guide the second material tape from which the second release paper is separated to the second cutting and splicing assembly.

9. The cutting and splicing device according to claim 8, wherein: The first feed roller group further includes a first release paper recovery buffer roller, which is disposed between the first main roller and the first release paper recovery roller and is used to buffer the movement of the first release paper during the period when the first release paper recovery roller pulls the first release paper out from the first material roll; and The second feed roller group further includes a second release paper recovery buffer roller. The roller is arranged between the second main roller and the second release paper recovery roller, and is used for buffering the movement of the second release paper during the period when the second release paper recovery roller pulls out the second release paper from the second material roll.

10. The cutting and splicing device according to any one of claims 1 to 9, wherein: The cutting and splicing device further comprises a first residual material receiving roller and a second residual material receiving roller, wherein the first residual material receiving roller is used to recover the material head of the cut first material strip, and the second residual material receiving roller is used to recover the material head of the cut second material strip.

11. The cutting and splicing device according to any one of claims 1 to 9, wherein: The cutting and splicing device further includes a fifth guide rail and a fifth driver, wherein the fifth driver is used to drive the first cutting and splicing assembly and the second cutting and splicing assembly to move toward or away from each other along the fifth guide rail.

12. The cutting and splicing device according to claim 5, wherein: The cutting and splicing device further comprises a deviation correction mechanism, which is mechanically connected to at least one of the first feed roller group and the second feed roller group and is used to compensate for the deviation of the first feed roller group or the second feed roller group during feeding.

13. A coating system for processing a battery cell, comprising: The cutting and splicing device according to any one of claims 1 to 12; and A coating device is used to coat the diaphragm received from the cutting and splicing device on the surface of the battery cell.

14. A method for cutting and splicing a material strip using a cutting and splicing device, the cutting and splicing device comprising: A first cutting and splicing assembly, the first cutting and splicing assembly comprising a first cutting knife, a second cutting knife and a first pressing member arranged between the first cutting knife and the second cutting knife; and a second cutting and splicing assembly, the second cutting and splicing assembly comprising a third cutter, a fourth cutter, and a second pressing member disposed between the third cutter and the fourth cutter and facing the first pressing member, and Wherein, the method comprises: Providing a first material strip and a second material strip; controlling the first pressing member and the second pressing member to move toward each other to press the first material strip and the second material strip located between the first pressing member and the second pressing member to obtain a spliced ​​material strip; and Control the first cutter and the fourth cutter to respectively cut off the first material strip and the second material strip pressed against the first material strip. The tail of the first tape or the head of the second tape is cut off by controlling the second cutter and the third cutter to cut off the tail of the first tape and the head of the second tape respectively.

15. The method according to claim 14, wherein: The cutting and splicing device also includes: a first main roller for carrying a first material roll including the first material strip; and a second main roller for carrying a second material roll including the second material strip, and Wherein, the method further comprises: controlling the first pressing member and the second pressing member to move away from each other; and The first main roller is controlled to rotate to at least partially pull the first material strip with the cut-off head back from the first cutting and splicing assembly, or the second main roller is controlled to rotate to at least partially pull the second material strip with the cut-off head back from the second cutting and splicing assembly.

16. The method according to claim 14, wherein: The cutting and splicing device further comprises a first waste material receiving roller and a second waste material receiving roller, and Wherein, the method further comprises: The first remnant material receiving roller is controlled to rotate to recover the cut ends of the first material strip, or the second remnant material receiving roller is controlled to rotate to recover the cut ends of the second material strip.

17. The method according to any one of claims 14 to 16, wherein: Providing the first material strip and the second material strip includes: providing a first material strip from which a first release paper is separated; and A second material strip from which the second release paper is separated is provided.

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