Composite flaking equipment

Abstract

The utility model provides composite flaking equipment which comprises a pre-pressing mechanism, a flaking mechanism, a flaking mechanism and a flaking mechanism, the pre-pressing mechanism comprises two pre-pressing rollers, the two pre-pressing rollers are used for receiving foils, and a material belt is wound on the peripheral surface of at least one of the two pre-pressing rollers; the cutting mechanism is arranged opposite to the pre-pressing roller, and the material belt on the pre-pressing roller is cut into multiple sections by the cutting mechanism; the pre-pressing mechanism can be switched between a first state and a second state, when the pre-pressing mechanism is in the first state, the two pre-pressing rollers are spaced to form a gap for the foil to pass through, and when the pre-pressing mechanism is in the second state, the two pre-pressing rollers clamp the foil and the material belt and cover at least one section of the material belt on the foil to form a part to be compounded. The composite flaking equipment disclosed by the utility model can realize intermittent attachment of materials on the surface of the foil, and is better suitable for a lamination process. And in addition, the material belt on the pre-pressing roller is cut, so that the cutting precision and stability are improved, and the yield of products is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, and more specifically, to a composite film making device. Background Art

[0002] In the related art, the production of lithium electrode sheets requires the lamination of lithium strips onto copper foil. During the lamination process, frequent cutting of the electrode sheets by the cutter will cause the blade to stick to lithium, which will then make the blade blunt and cause burrs on the cut edge of the copper foil. The burrs can easily penetrate the diaphragm and cause a short circuit between the positive and negative electrodes, causing the battery to heat up or even explode, thereby endangering the personal safety of the user. For this reason, it is necessary to intermittently laminate lithium strips on the surface of the foil to adapt to the lamination process. However, the incoming lithium strips are usually laminated on diaphragms (such as PP film / PET film, etc.), the peeling force between the lithium strip and the diaphragm is very low, and the lithium strip itself is very thin and the material is very soft. It is difficult for existing equipment to laminate the lithium strip gaps onto the copper foil while ensuring the lamination effect and accuracy. Utility Model Content

[0003] The utility model provides a new technical solution for composite film making equipment, which can at least solve the problem in the prior art that it is difficult to composite lithium strip gaps on copper foil.

[0004] The utility model provides a composite sheet making device, comprising: a pre-pressing mechanism, the pre-pressing mechanism comprising two pre-pressing rollers, the two pre-pressing rollers are used to receive foil materials, and a material belt is wound around the outer peripheral surface of at least one of the two pre-pressing rollers; a cutting mechanism, the cutting mechanism is arranged opposite to the pre-pressing roller, and the cutting mechanism cuts the material belt on the pre-pressing roller into multiple sections; wherein the pre-pressing mechanism is switchable between a first state and a second state, when the pre-pressing mechanism is in the first state, the two pre-pressing rollers are spaced apart to form a gap for the foil material to pass through, and when the pre-pressing mechanism is in the second state, the two pre-pressing rollers clamp the foil material and the material belt and cover at least one section of the material belt on the foil material to form a component to be composited.

[0005] Optionally, the pre-pressing mechanism further comprises: a driving member, wherein the driving member is connected to at least one of the pre-pressing rollers to drive the two pre-pressing rollers to move closer to or away from each other in their radial direction.

[0006] Optionally, the pre-pressure roller is a negative pressure roller, and the negative pressure roller is used to adsorb the material belt.

[0007] Optionally, the cutting mechanism includes at least one of a die cutter and a laser cutter.

[0008] Optionally, the material belt is wound around the outer circumferential surface of each pre-pressing roller, the number of the cutting mechanisms is two, and the two cutting mechanisms are arranged in a one-to-one correspondence with the two pre-pressing rollers.

[0009] Optionally, the composite film making equipment also includes: a foil unwinding mechanism, which releases the foil between the two pre-pressing rollers; a first material film unwinding mechanism, which releases the first material film covered with the material strip to the pre-pressing roller; and a first material film winding mechanism, which receives the first material film from the pre-pressing mechanism.

[0010] Optionally, the composite film making equipment further comprises: a tension adjusting mechanism, which is disposed between the first material film unwinding mechanism and the pre-pressing roller and is used to adjust the tension of the first material film.

[0011] Optionally, the composite film making equipment also includes: a pressure roller, which is arranged opposite to the pre-pressing roller, and the pressure roller and the pre-pressing roller receive the first material film from the first material film unwinding mechanism, and the pressure roller presses the material strip against the outer peripheral surface of the pre-pressing roller.

[0012] Optionally, the composite sheet making equipment further comprises: a composite mechanism, which is arranged downstream of the pre-pressing mechanism, and receives the component to be composited from the pre-pressing mechanism and composites the material strip with the foil material to form a composite component.

[0013] Optionally, the composite film making equipment also includes: a second material film unwinding mechanism, which releases a second material film to the composite mechanism, and the second material film is located on the side of the foil material covered with the material strip; and a second material film winding mechanism, which receives the second material film from the composite mechanism.

[0014] Optionally, the composite film-making equipment further comprises: a composite winding mechanism, which is arranged downstream of the composite mechanism and winds up the composite member.

[0015] Optionally, the composite film making equipment further comprises: a third material film unwinding mechanism, wherein the third material film unwinding mechanism releases the third material film to the composite winding mechanism, so that the third material film is wound together with the composite component.

[0016] According to the composite film making equipment of the utility model, a material belt is wound around at least one of the two pre-pressing rollers, and the material belt is cut by a cutting mechanism. With the switching of the pre-pressing mechanism between the first state and the second state, the material belt can be intermittently attached to the surface of the foil to form a composite part, and then the composite part is composited to obtain a composite part, so that when cutting the composite part, the cutter is prevented from adhering to the material, making the cutter blunt and causing burrs during cutting, which is beneficial to improving the yield of the product. When applied to the production of lithium electrode sheets, it can be better suitable for the lamination process. Cutting the material belt on the pre-pressing roller is beneficial to improving the cutting accuracy and stability, thereby improving the yield of the product. In addition, the material belt can be attached to the foil to avoid waste of the material belt and reduce production costs.

[0017] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0019] Figure 1 This is a front view of a composite part made by a composite film making device according to an embodiment of the utility model;

[0020] Figure 2 It is a top view of a composite part made by a composite film making device according to an embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a composite film-making device according to an embodiment of the utility model;

[0022] Figure 4 It is an enlarged view of a part of the structure of a composite tableting device according to an embodiment of the utility model;

[0023] Figure 5 It is a process flow chart of a composite tableting device according to an embodiment of the utility model.

[0024] Reference numerals

[0025] Composite film making equipment 100;

[0026] Foil unwinding mechanism 1; first material film unwinding mechanism 2; tension adjusting mechanism 3; pre-pressing mechanism 4; pre-pressing roller 41; driving member 42; pressing roller 43; cutting mechanism 5; first material film winding mechanism 6; compounding mechanism 7; second material film unwinding mechanism 8; second material film winding mechanism 9; compound winding mechanism 10; third material film unwinding mechanism 11; deviation correcting mechanism 12; tape splicing mechanism 13; foil 14; material tape 15; first material film 16; second material film 17; third material film 18; part to be compounded 19; compound part 20; material-free area 21; material-containing area 22. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] The composite film-making device 100 according to the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 5 As shown, the composite film-making device 100 according to the embodiment of the utility model includes: a pre-pressing mechanism 4 and a cutting mechanism 5.

[0034] Specifically, the foil 14 pre-pressing mechanism 4 includes two pre-pressing rollers 41, which are used to receive the foil 14, and the material strip 15 is wound around the outer circumference of at least one of the two foil 14 pre-pressing rollers 41. The foil 14 cutting mechanism 5 is arranged opposite to the foil 14 pre-pressing rollers 41, and the foil 14 cutting mechanism 5 cuts the foil 14 material strip 15 on the foil 14 pre-pressing rollers 41 into multiple sections. The foil 14 pre-pressing mechanism 4 can be switched between a first state and a second state. When the foil 14 pre-pressing mechanism 4 is in the first state of the foil 14, the two foil 14 pre-pressing rollers 41 are spaced apart to form a gap for the foil 14 to pass through. When the foil 14 pre-pressing mechanism 4 is in the second state of the foil 14, the two foil 14 pre-pressing rollers 41 clamp the foil 14 and the material strip 15 and cover at least one section of the material strip 15 on the foil 14 to form a composite part 19.

[0035] In other words, the composite film-making device 100 according to the embodiment of the present invention is mainly composed of a pre-pressing mechanism 4 and a cutting mechanism 5 .

[0036] The pre-pressing mechanism 4 may be mainly composed of two pre-pressing rollers 41 , the axes of the two pre-pressing rollers 41 may be parallel to each other, each pre-pressing roller 41 may rotate around its own axis, and the rotation directions of the two pre-pressing rollers 41 are opposite. The foil 14 may pass between the two pre-pressing rollers 41 .

[0037] A material strip 15 may be wound around the outer circumference of one of the two pre-pressing rollers 41, or a material strip 15 may be wound around the outer circumference of each pre-pressing roller 41. The material strip 15 may be compounded with the foil 14 to form a composite member 20. Optionally, the material strip 15 may include but is not limited to a lithium strip, the foil 14 may be a copper foil, and the lithium strip may be compounded with the foil 14 to form a pole piece.

[0038] The cutting mechanism 5 can be arranged opposite to the pre-pressing roller 41 around which the material belt 15 is wound. Specifically, the cutting knife of the cutting mechanism 5 can face the outer peripheral surface of the pre-pressing roller 41. The cutting mechanism 5 can cut the lithium belt on the outer peripheral surface of the pre-pressing roller 41 into multiple sections, and the multiple sections of lithium belt can be arranged along the circumference of the pre-pressing roller 41.

[0039] In addition, the pre-pressing mechanism 4 can be switched between a first state and a second state. The first state can be an open state, and the second state can be a pressed state.

[0040] When the pre-pressing mechanism 4 is in the first state, the two pre-pressing rollers 41 can be spaced apart to form a gap, through which the foil 14 can pass, and the outer peripheral surface of the pre-pressing roller 41 can be spaced apart from the surface of the foil 14 , so that the material belt 15 on the pre-pressing roller 41 will not adhere to the surface of the foil 14 , thereby forming a material-free area 21 on the surface of the foil 14 .

[0041] When the pre-pressing mechanism 4 is in the second state, the two pre-pressing rollers 41 can clamp the foil 14, and the material strip 15 on the pre-pressing rollers 41 can abut against the foil 14, so the two pre-pressing rollers 41 can clamp the foil 14 and the material strip 15 together and make the material strip 15 adhere to the foil 14. As the pre-pressing rollers 41 rotate, the foil 14 is continuously conveyed, and one or more sections of the material strip 15 cut from the pre-pressing rollers 41 can adhere to the foil 14, thereby forming a material area 22 on the surface of the foil 14.

[0042] The film-making process of the composite film-making device 100 of this embodiment is described in detail below.

[0043] The copper foil passes between the two pre-pressing rollers 41, and the pre-pressing mechanism 4 switches to the second state. The two pre-pressing rollers 41 clamp the foil 14 and the material strip 15, and the foil 14 continues to be transported downstream. Each pre-pressing roller 41 rotates in the opposite direction so that a section of the material strip 15 on the pre-pressing roller 41 is attached to the surface of the foil 14, so that a section of the material area 22 is formed on the surface of the foil 14. After attaching a section of the material strip 15, the pre-pressing mechanism 4 can be switched to the first state, the two pre-pressing rollers 41 are separated from the foil 14, and the two pre-pressing rollers 41 stop rotating. At this time, the foil 14 continues to be transported downstream for a section, so that a section of the material-free area 21 is formed on the surface of the foil 14. Then repeat the above state switching, so that the material area 22 and the material area on the surface of the foil 14 can be arranged alternately, so as to realize the intermittent attachment of the material strip 15 on the surface of the foil 14 to form the to-be-compounded part 19. The to-be-compounded part 19 can be compounded to form a composite part 20 in the subsequent processing process.

[0044] In the composite part 20, the surface of the foil 14 may be intermittently composited with the material strip 15. That is, multiple sections of the material strip 15 are arranged at intervals along the length direction of the foil 14, and in the area between adjacent material strips 15, the material strip 15 is not attached to the surface of the foil 14. The cutter for cutting the composite part 20 can cut the foil 14 from between adjacent material strips 15, avoiding the adhesion of the cutter to the material, thereby avoiding burrs on the edge of the sheet formed by cutting, which is conducive to improving the yield of the product.

[0045] Alternatively, if Figure 1 and Figure 2 As shown, both sides of the foil 14 can be intermittently laminated with material strips 15 .

[0046] It should be noted that the composite film making equipment 100 of this embodiment can be used not only in the lithium battery industry, but also in other film-forming related industries, and is applicable to composite parts 20 that require compounding of a material strip 15 and a foil 14 .

[0047] When the composite film making device 100 is used in the lithium battery industry, the foil 14 can be a copper foil, and the material strip 15 can be a lithium strip. The composite film making device 100 of this embodiment can be used to intermittently attach lithium strips to the surface of the copper foil for composite, which can avoid the cutter from sticking lithium, and further avoid burrs on the edge of the electrode formed by cutting, which is beneficial to improving the yield rate of the negative electrode and improving the safety of the battery, while ensuring the lithium content of the negative electrode, and further ensuring the capacity of the battery.

[0048] Therefore, according to the composite film making equipment 100 of the embodiment of the utility model, the material belt 15 is wound around at least one of the two pre-pressing rollers 41, and the material belt 15 is cut by the cutting mechanism 5. With the switching of the pre-pressing mechanism 4 between the first state and the second state, it is possible to realize the intermittent attachment of the material belt 15 on the surface of the foil 14 to form the to-be-composite part 19, and then the to-be-composite part 19 is compounded to obtain the composite part 20, so as to avoid the cutter from adhering to the material when cutting the composite part 20, so that the cutter becomes blunt and burrs are generated during cutting, which is beneficial to improving the yield of the product. When applied to the production of lithium electrode sheets, it can be better suitable for the lamination process. Cutting the material belt 15 on the pre-pressing roller 41 is beneficial to improving the cutting accuracy and stability, thereby improving the yield of the product. In addition, the material belt 15 can be attached to the foil 14 to avoid the waste of the material belt 15 and reduce the production cost.

[0049] In some optional embodiments, the cutting mechanism 5 can be controlled as required to ensure that only the material strip 15 is cut and separated when the material strip 15 is cut, thereby avoiding damage to the surface of the pre-pressing roller 41 .

[0050] According to an embodiment of the present invention, the pre-pressing mechanism 4 further includes a driving member 42, which is connected to at least one pre-pressing roller 41 to drive the two pre-pressing rollers 41 to move closer to or farther from each other in their radial direction. Specifically, the following situations may be included but are not limited to.

[0051] In case 1, the pre-pressing mechanism 4 includes a driving member 42, which can be connected to a pre-pressing roller 41 and drive the pre-pressing roller 41 to approach or move away from another pre-pressing roller 41 along its radial direction;

[0052] In case 2, the pre-pressing mechanism 4 includes a driving member 42, which can be connected to the two pre-pressing rollers 41 respectively through a transmission mechanism, and synchronously drive the two pre-pressing rollers 41 to approach or move away from each other along their own radial direction;

[0053] Case three, if Figure 3 and Figure 4 As shown, the pre-pressing mechanism 4 includes two driving members 42 , and the two driving members 42 can be connected to the two pre-pressing rollers 41 in a one-to-one correspondence. The two driving members 42 respectively drive the corresponding pre-pressing roller 41 to approach or move away from the other pre-pressing roller 41 .

[0054] In the above three situations, the two pre-pressing rollers 41 can be moved closer to or farther away from each other in their radial direction, so that the pre-pressing mechanism 4 switches between the first state and the second state. When the pre-pressing mechanism 4 switches from the first state to the second state, the two pre-pressing rollers 41 move closer to each other, and when the pre-pressing mechanism 4 switches from the second state to the first state, the two pre-pressing rollers 41 move away from each other.

[0055] Optionally, the driving member 42 may include a cylinder and a mounting plate, the telescopic rod of the cylinder may be connected to the mounting plate, the pre-pressing roller 41 is rotatably arranged on the mounting plate, the cylinder drives the mounting plate through the telescopic rod, and then drives the pre-pressing roller 41 to move along its own radial direction.

[0056] In this embodiment, a driving member 42 is provided to be connected to the pre-pressing roller 41 and drives the pre-pressing roller 41 to move along its own radial direction, so that the pre-pressing mechanism 4 can be switched between the first state and the second state, and the process of intermittently attaching the material strip 15 to the surface of the foil 14 can be electrically controlled, which is beneficial to improving the degree of automation and control accuracy, and improving production efficiency.

[0057] According to some other embodiments of the present invention, the pre-pressure roller 41 is a negative pressure roller, and the negative pressure roller is used to adsorb the material belt 15 .

[0058] Specifically, the outer circumference of the pre-pressing roller 41 can form a negative pressure, and the material belt 15 can be adsorbed on the outer circumference of the pre-pressing roller 41, which is conducive to improving the stability and reliability of the material belt 15 when it is wound on the outer circumference of the pre-pressing roller 41, and at the same time avoiding the material belt 15 from adhering to the surface of the pre-pressing roller 41. When the pre-pressing mechanism 4 is in the second state, after the material belt 15 abuts against the surface of the foil 14, the pre-pressing roller 41 can stop adsorbing the material belt 15, so that the material belt 15 adheres to the surface of the foil 14.

[0059] For example, the pre-pressing roller 41 can be a hollow structure, and a plurality of adsorption holes can be provided on the outer peripheral surface of the pre-pressing roller 41. The pre-pressing roller 41 can be connected to a vacuum pumping mechanism, and a negative pressure can be formed in the cavity of the pre-pressing roller 41 by utilizing the vacuum pumping mechanism, thereby forming a negative pressure at the adsorption holes to adsorb the material belt 15.

[0060] In some specific embodiments of the present invention, the cutting mechanism 5 includes at least one of a die-cutting machine and a laser cutting machine. The die-cutting machine and the laser cutting machine have the advantages of mature technology, high reliability and high precision, and can accurately control the length of each cut material strip 15, which is beneficial to improving the accuracy and yield of the product.

[0061] According to some optional embodiments of the present invention, a material belt 15 is wound around the outer circumference of each pre-pressing roller 41 , and there are two cutting mechanisms 5 , which are arranged in a one-to-one correspondence with the two pre-pressing rollers 41 .

[0062] Specifically, the material belt 15 may be wound around the outer circumference of the two pre-pressing rollers 41, and a cutting mechanism 5 may be correspondingly provided on the outer circumference of each pre-pressing roller 41, and each cutting mechanism 5 may cut the material belt 15 on the corresponding pre-pressing roller 41. Thus, the two pre-pressing rollers 41 may intermittently attach the material belt 15 to both sides of the foil 14, respectively, to form a composite member 20 with materials on both sides.

[0063] According to some other embodiments of the present invention, the composite film making device 100 further includes: a foil unwinding mechanism 1, a first material film unwinding mechanism 2 and a first material film winding mechanism 6. The foil unwinding mechanism 1 releases the foil 14 between the two pre-pressing rollers 41. The first material film unwinding mechanism 2 releases the first material film 16 covered with the material strip 15 to the pre-pressing roller 41. The first material film winding mechanism 6 receives the first material film 16 from the pre-pressing mechanism 4.

[0064] Specifically, a foil unwinding mechanism 1 and a first material film unwinding mechanism 2 may be provided upstream of the pre-pressing mechanism 4 , and a first material film winding mechanism 6 may be provided downstream of the pre-pressing mechanism 4 .

[0065] The foil 14 reeling mechanism may include a foil unwinding roller, on which the foil 14 may be wound. The foil unwinding mechanism 1 may release the foil 14 to the pre-pressing mechanism 4.

[0066] Optionally, a deviation correction mechanism 12 and a tension control mechanism may be provided between the foil unwinding mechanism 1 and the pre-pressing mechanism 4 . The deviation correction mechanism 12 may be provided upstream of the tension control mechanism. The deviation correction mechanism 12 is used to correct the deviation of the foil 14 , and the tension control mechanism is used to control the tension of the foil 14 .

[0067] The first material film unwinding mechanism 2 may include a first material film unwinding roller, on which a first material film 16 may be wound, and a material tape 15 is attached to the first material film 16. It should be noted that the material tape 15 needs to be attached to the first material film 16 for storage and transportation. The first material film 16 may include but is not limited to PP film and PET film. When the material tape 15 is a lithium tape, the peeling force between the lithium tape and the first material film 16 is very low, and the lithium tape itself is very thin and the material is very soft.

[0068] Since the cutting mechanism 5 cuts the material strip 15 on the pre-pressing roller 41 during cutting, the first material film 16 will not be affected during cutting. The pre-pressing roller 41 as a carrier is less likely to be damaged during cutting than the first material film 16 .

[0069] The first material film unwinding mechanism 2 can release the first material film 16 with the material tape 15 attached to the pre-pressing mechanism 4, and then the material tape 15 on the first material film 16 can be transferred to the pre-pressing roller 41 in the pre-pressing mechanism 4. When the pre-pressing roller 41 is a negative pressure roller, the negative pressure roller can absorb the material tape 15 on the first material film 16.

[0070] The first material film winding mechanism 6 may include a first material film winding roller, which may be used to wind up the first material film 16 after passing through the pre-pressing mechanism 4 , and the wound first material film 16 is no longer attached with the material belt 15 .

[0071] In some specific embodiments, when the material strips 15 are attached to both sides of the foil 14, the number of the first material film unwinding mechanism 2 and the first material film winding mechanism 6 can be two respectively, and the two first material film unwinding mechanisms 2 can release the first material film 16 attached with the material strips 15 to both sides of the foil 14, and the two first material film winding mechanisms 6 can respectively wind up the first material film 16 released by the corresponding first material film unwinding mechanisms 2.

[0072] Optionally, the two first material film unwinding mechanisms 2, the two first material film winding mechanisms 6, the two pre-pressing rollers 41, the two driving members 42, and the two cutting structures may be symmetrically arranged along the vertical direction.

[0073] In this embodiment, the foil unwinding mechanism 1, the first material film unwinding mechanism 2 and the first material film winding mechanism 6 are provided, which is beneficial to improving the integration of the composite film making equipment 100 and improving the production efficiency.

[0074] In some specific embodiments of the present invention, the composite film making device 100 further includes a tension adjustment mechanism 3 , which is disposed between the first material film unwinding mechanism 2 and the pre-pressing roller 41 and is used to adjust the tension of the first material film 16 .

[0075] Specifically, since the pre-pressing roller 41 is displaced when the pre-pressing mechanism 4 is between the first state and the second state, the position where the first material film 16 abuts against the pre-pressing roller 41 for the pre-pressing roller 41 to adsorb the material belt 15 will also change accordingly, thereby affecting the tension of the first material film 16. A tension adjustment mechanism 3 is provided between the first material film unwinding mechanism 2 and the corresponding pre-pressing roller 41, which can adjust the tension of the first material film 16 attached with the material belt 15 to avoid damage or tearing of the material belt 15, which is beneficial to improving the yield of the composite part 20.

[0076] According to some optional embodiments of the present invention, the composite film making equipment 100 also includes a pressure roller 43, which is arranged opposite to the pre-pressing roller 41. The pressure roller 43 and the pre-pressing roller 41 receive the first material film 16 from the first material film unwinding mechanism 2, and the pressure roller 43 presses the material belt 15 against the outer peripheral surface of the pre-pressing roller 41.

[0077] Specifically, a pressing roller 43 is further provided on the outer peripheral side of the pre-pressing roller 41. In the rotation direction of the pre-pressing roller 41, the pressing roller 43 can be arranged upstream of the cutting mechanism 5, and the foil 14 passing through between the two pre-pressing rollers 41 can be located downstream of the cutting mechanism 5. In the conveying direction of the first material film 16, the pressing roller 43 can be located downstream of the first material film unwinding mechanism 2 and upstream of the first material film winding mechanism 6.

[0078] The pressure roller 43 can abut against the outer peripheral surface of the pre-pressing roller 41, and the first material film 16 can pass between the pressure roller 43 and the pre-pressing roller 41. Thus, the pressure roller 43 can press the first material film 16 against the outer peripheral surface of the pre-pressing roller 41, so that the pre-pressing roller 41 can adsorb the material belt 15 on the first material film 16.

[0079] In some optional embodiments, two pressure rollers 43 may be provided on the outer peripheral side of each pre-pressing roller 41. The two pressure rollers 43 may be arranged at intervals along the circumference of the pre-pressing roller 41. The two pressure rollers 43 may press the first material film 16 against the outer peripheral surface of the pre-pressing roller 41 to increase the contact area between the first material film 16 and the pre-pressing roller 41, thereby facilitating the pre-pressing roller 41 to adsorb the material belt 15.

[0080] According to some other embodiments of the present invention, the composite film making equipment 100 also includes a composite mechanism 7, which is arranged downstream of the pre-pressing mechanism 4. The composite mechanism 7 receives the component 19 to be composited from the pre-pressing mechanism 4 and composites the material strip 15 with the foil 14 to form a composite component 20.

[0081] Specifically, a composite mechanism 7 may be provided downstream of the pre-pressing mechanism 4, and the to-be-compounded component 19 formed by the pre-pressing mechanism 4 may be transported to the composite mechanism 7 for composite to form a composite component 20. During the composite process, the material strip 15 attached to the surface of the foil 14 may be pressed against the foil 14, so that the material strip 15 and the foil 14 are more tightly bonded.

[0082] Optionally, the composite mechanism 7 may include two composite rollers, the axes of the two composite rollers may be parallel to each other, the workpiece 19 to be composited may pass between the two composite rollers, and the composite rollers may roll the workpiece to be composited.

[0083] In this embodiment, the composite mechanism 7 cooperates with the pre-pressing mechanism 4 to first intermittently attach the material strip 15 to the surface of the foil 14, and then composite and press the material strip 15 and the copper foil. Since the position of the composite roller in the composite mechanism 7 can remain unchanged, the composite pressure can be kept unchanged, which is beneficial to improving the quality of rolling and improving the yield of the composite part 20.

[0084] In some specific embodiments of the present invention, the composite film making device 100 includes a second film unwinding mechanism 8 and a second film rewinding mechanism 9. The second film unwinding mechanism 8 releases a second film 17 to the composite mechanism 7, and the second film 17 is located on the side of the foil 14 covered with the material strip 15. The second film rewinding mechanism 9 receives the second film 17 from the composite mechanism 7.

[0085] Specifically, the second material film 17 can be a protective film, the second material film unwinding mechanism 8 can be arranged upstream of the composite mechanism 7, and the second material film winding mechanism 9 can be arranged downstream of the composite mechanism 7. The second material film 17 is wound on the outer peripheral surface of the composite roller, and when the composite roller rolls the component 19 to be composited, the second material film 17 can be located between the composite roller and the component 19 to be composited, thereby, the second material film 17 can protect the composite roller and prevent the material belt 15 from adhering to the composite roller.

[0086] like Figure 3 As shown, there are two second film unwinding mechanisms 8 and two second film winding mechanisms 9 respectively, and the two second film unwinding mechanisms 8 and the two second film winding mechanisms 9 can be symmetrically arranged on both sides of the to-be-compounded component 19 along the vertical direction.

[0087] A tension adjustment mechanism 3 may be provided between each second material film unwinding mechanism 8 and the composite roller and between each second material film winding mechanism 9 and the composite roller to adjust the tension of the second material film 17 to prevent the second material film 17 from wrinkling or tearing.

[0088] According to some optional embodiments of the present invention, the composite film making device 100 further includes a composite winding mechanism 10, which is arranged downstream of the composite mechanism 7, and the composite winding mechanism 10 winds up the composite member 20. Thus, the composite winding mechanism 10 can wind up the composite member 20 compounded by the composite mechanism 7 to store the composite member 20.

[0089] Optionally, a tension adjustment mechanism 3 and a tape splicing mechanism 13 may be provided between the composite mechanism 7 and the composite winding mechanism 10, and the tension adjustment mechanism 3 may be provided upstream of the tape splicing mechanism 13. The tape splicing mechanism 13 may splice the composite member 20 to increase the volume of a single winding.

[0090] In some other embodiments, a detection mechanism may be further provided between the composite mechanism 7 and the composite winding mechanism 10, and the detection mechanism may detect the composite part 20 and mark defective products to mark the area of ​​defective products, so as to facilitate the removal of defective products in subsequent processing.

[0091] According to some other embodiments of the present invention, the composite film making device 100 further includes a third material film unwinding mechanism 11 , which releases the third material film 18 to the composite winding mechanism 10 so that the third material film 18 is wound together with the composite part 20 .

[0092] like Figure 3 As shown, a third material film unwinding mechanism 11 can also be provided upstream of the composite winding mechanism 10. The third material film unwinding mechanism 11 can release a third material film 18 to the composite winding mechanism 10. The third material film 18 can be wound together with the composite part 20. After winding, two adjacent layers of the composite part 20 can be separated by the third material film 18. The third material film 18 can prevent the lithium tapes between the two adjacent layers of the composite part 20 from sticking to each other.

[0093] like Figure 5 As shown, the specific working process of the composite film-making device 100 of this embodiment is described in detail below.

[0094] The two first material film unwinding mechanisms 2 unwind downstream, that is, the A-side lithium tape unwinding and the B-side lithium tape unwinding, and then respectively perform unwinding correction and tension measurement on the two first material films 16, and at the same time perform tension control on the first material film 16. The first material film 16 is pressed against the surface of the pre-pressing roller 41, and the pre-pressing roller 41 adsorbs the material strip 15 on the first material film 16 to achieve sheet storage. The cutting mechanism 5 cuts the material strip 15 on the pre-pressing roller 41. At the same time, the foil unwinding mechanism 1 releases the foil 14 downstream, that is, the copper foil unwinding, and then performs unwinding correction and tension control on the foil 14. When the foil 14 passes through the pre-pressing mechanism 4, the pre-pressing roller 41 pre-presses and compounds the material strip 15 with the foil 14, so that the material strip 15 cut into multiple sections is intermittently attached to the foil 14 to form a component 19 to be compounded.

[0095] The second film unwinding mechanism 8 releases the second film 17 to the laminating mechanism 7, and the released second film 17 can be subjected to unwinding deviation correction and tension control. Then the second film 17 and the part to be laminated 19 are rolled together by the laminating mechanism 7, that is, laminated, and the second film 17 protects the laminating roller, and the part to be laminated 19 is rolled to form a composite part 20. The second film 17 after passing through the laminating roller is rolled by the second film winding mechanism 9, and can be subjected to tension control and unwinding deviation correction before rolling.

[0096] The composite mechanism 7 releases the composite part 20 downstream, and the composite part 20 can be sequentially subjected to tension control, winding correction, CCD detection and defective product marking, and then the composite tape is wound by the composite winding mechanism 10.

[0097] In summary, the composite film making equipment 100 of the embodiment of the utility model is to wind the material belt 15 around at least one of the two pre-pressing rollers 41, and use the cutting mechanism 5 to cut the material belt 15, and cooperate with the switching of the pre-pressing mechanism 4 between the first state and the second state, so that the material belt 15 can be intermittently attached to the surface of the foil 14 to form a composite part 19 to be composited, and then the composite part 19 to be composited is obtained to obtain the composite part 20, so as to avoid the cutter from adhering to the material when cutting the composite part 20, so that the cutter becomes blunt and burrs are generated during cutting, which is beneficial to improving the yield of the product. When applied to the production of lithium electrode sheets, it can be better suitable for the lamination process. Cutting the material belt 15 on the pre-pressing roller 41 is beneficial to improving the cutting accuracy and stability, thereby improving the yield of the product. In addition, the material belt 15 can be attached to the foil 14 to avoid the waste of the material belt 15 and reduce the production cost.

[0098] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A composite film-making device, characterized in that: include: A pre-pressing mechanism, the pre-pressing mechanism comprising two pre-pressing rollers, the two pre-pressing rollers are used to receive the foil material, and a material belt is wound around the outer circumference of at least one of the two pre-pressing rollers; A cutting mechanism, the cutting mechanism is arranged opposite to the pre-pressing roller, and the cutting mechanism cuts the material strip on the pre-pressing roller into multiple sections; The pre-pressing mechanism is switchable between a first state and a second state. When the pre-pressing mechanism is in the first state, the two pre-pressing rollers are spaced apart to form a gap for the foil to pass through. When the pre-pressing mechanism is in the second state, the two pre-pressing rollers clamp the foil and the material strip and cover at least a section of the material strip on the foil to form a component to be composited.

2. The composite film making equipment according to claim 1, characterized in that: The pre-pressing mechanism also includes: A driving member is connected to at least one of the pre-pressing rollers to drive the two pre-pressing rollers to approach or move away from each other in their radial direction.

3. The composite film making equipment according to claim 1, characterized in that: The pre-pressure roller is a negative pressure roller, and the negative pressure roller is used for adsorbing the material belt.

4. The composite film making equipment according to claim 1, characterized in that: The cutting mechanism includes at least one of a die cutter and a laser cutter.

5. The composite film-making equipment according to claim 1, characterized in that: The material belt is wound around the outer circumferential surface of each pre-pressing roller, and the number of the cutting mechanisms is two, and the two cutting mechanisms are arranged in a one-to-one correspondence with the two pre-pressing rollers.

6. The composite film making equipment according to claim 1, characterized in that: Also includes: A foil unwinding mechanism, wherein the foil unwinding mechanism releases the foil between the two pre-pressing rollers; a first material film unwinding mechanism, which releases the first material film covered with the material strip to the pre-pressing roller; A first material film winding mechanism receives the first material film from the pre-pressing mechanism.

7. The composite film-making equipment according to claim 6, characterized in that: Also includes: A tension adjustment mechanism is provided between the first material film unwinding mechanism and the pre-pressing roller, and is used for adjusting the tension of the first material film.

8. The composite film-making equipment according to claim 6, characterized in that: Also includes: A pressure roller is arranged opposite to the pre-pressing roller, and the pressure roller and the pre-pressing roller receive the first material film from the first material film unwinding mechanism, and the pressure roller presses the material strip onto the outer peripheral surface of the pre-pressing roller.

9. The composite film-making equipment according to claim 1, characterized in that: Also includes: A compounding mechanism is arranged downstream of the pre-pressing mechanism, and receives the component to be compounded from the pre-pressing mechanism and compounds the material strip with the foil material to form a compound component.

10. The composite film-making equipment according to claim 9, characterized in that: Also includes: a second material film unwinding mechanism, which releases a second material film to the composite mechanism, wherein the second material film is located on a side of the foil material covered with the material strip; The second material film winding mechanism receives the second material film from the compounding mechanism.

11. The composite film-making equipment according to claim 9, characterized in that: Also includes: A composite winding mechanism is provided downstream of the composite mechanism, and the composite winding mechanism winds up the composite member.

12. The composite tableting equipment according to claim 11, characterized in that: Also includes: A third material film unwinding mechanism is used to release the third material film to the composite winding mechanism so that the third material film is wound together with the composite component.

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