A lamination and lamination production line and its usage method

Abstract

This invention discloses a lamination production line and its usage method, including a powder nickel mesh lamination mechanism and a PTFE film pressing machine. The powder nickel mesh lamination mechanism includes an anti-clogging feeding mechanism, a dry powder roller pressing mechanism, a composite roller pressing mechanism, and a composite structure winding structure. The PTFE film pressing machine includes a vertical lamination roller pressing mechanism, a paper tape unwinding mechanism, a PTFE film unwinding mechanism, and a first composite structure unwinding mechanism. This invention can effectively prevent powder accumulation and adhesion, ensuring that the dry powder tape can be smoothly and continuously rolled and formed. By protecting the PTFE film during roller lamination with paper tape, wrinkling and damage to the PTFE film are effectively prevented. During operation, the dry powder tape forms a U-shaped suspended structure, thereby providing better redundancy and effectively preventing it from being pulled apart by the two roller structures.

Description

Technical Field

[0001] This invention relates to the field of machinery, and in particular to a pressure film composite production line and its method of use. Background Technology

[0002] Currently, lithium-ion battery electrode production typically involves coating a slurry onto a foil, as disclosed in invention patent CN 114932060 A, which describes a coating method and apparatus for lithium battery electrodes. However, this method has drawbacks. Due to the fluidity of the slurry, it is difficult to coat it evenly onto the foil, resulting in difficulty controlling its thickness and boundaries. This makes it challenging to maintain consistent slurry thickness across the electrode, which is crucial for slurry consistency. Furthermore, the slurry contains a large amount of water, necessitating prolonged drying.

[0003] To address the aforementioned issues, some researchers have employed dry powder extrusion to produce electrode sheets. For instance, invention patent CN 115207267 A discloses a dry powder lithium battery electrode sheet forming method and an electrode sheet forming device. This method involves pressing dry powder composite materials into uniform electrode composite materials using roller pressing, and then pressing them together with a current collector to form an electrode sheet.

[0004] However, the comparison document uses rollers rotating in opposite directions to move the dry powder composite material along the roller's rotation direction, and then presses it together with the current collector. However, it has the following problems: 1. Because dry powder needs to be pressed into dry powder composite materials, it has a certain degree of stickiness and is easy to agglomerate and block the feed inlet, making it difficult to feed material into the hopper.

[0005] 2. The dry powder composite material required for the electrode needs to be coated with a PTFE film. However, since the PTFE film is very thin, only 15-40 micrometers, it is easy to wrinkle or be damaged if it is directly rolled with rollers.

[0006] 3. Existing technology uses rollers, which move the dry powder composite material along the roller surface and press it together with the current collector. This method has no safety redundancy. Due to the influence of roller tolerance and the fact that the dry powder composite material is easy to break after being pressed into a film (similar to flour being pressed into a film), even slight differences in roller speed can easily cause the dry powder composite material to be subjected to excessive tensile force and break. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a pressure-film composite production line.

[0008] The objective of this invention is achieved through the following technical solution: A lamination production line includes a powder nickel mesh lamination mechanism and a PTFE film pressing machine; the powder nickel mesh lamination mechanism includes an anti-clogging feeding mechanism, a dry powder roller pressing mechanism, a composite roller pressing mechanism, and a composite structure winding structure; the PTFE film pressing machine includes a vertical lamination roller pressing mechanism, a paper tape unwinding mechanism, a PTFE film unwinding mechanism, and a first composite structure unwinding mechanism; the vertical lamination roller pressing mechanism includes a second frame, with fixed roller mounting frames fixed on both sides of the middle of the second frame, fixed rollers axially connected between the fixed roller mounting frames, a first lifting structure connected to the fixed roller mounting frames, a pressure sensor connected to the first lifting structure, a pressure display screen connected to the pressure sensor, and a lifting roller mounting frame slidably connected to the pressure sensor and axially connected between the lifting roller mounting frames; The paper tape unwinding mechanism includes a paper tape unwinding roller on one side of the fixed roller mounting frame and a paper tape take-up roller on the other side of the fixed roller mounting frame. The PTFE film unwinding mechanism includes a PTFE film unwinding roller and a guide roller located on one side of the fixed roller mounting frame; The first composite structure unwinding mechanism includes a first composite structure unwinding roller on one side of the fixed roller mounting frame and a first composite structure take-up roller on the other side of the fixed roller mounting frame; two oppositely arranged guide plates are installed on the feed side of the fixed roller and the lifting roller.

[0009] As a further improvement, a powder brush and a negative pressure powder suction pipe are provided on one side of the fixed roller mounting frame.

[0010] In a further improvement, the anti-clogging feeding mechanism includes an upper powder cylinder, with a feed inlet at the top and a first motor installed thereon. A partition is fixed at the bottom of the upper powder cylinder, and a discharge port is formed on the partition at a position offset from the feed inlet. A vertical partition is fixed above the discharge port. A gap is formed between the discharge port and the bottom of the vertical partition. The first motor is connected to a scraper that cooperates with the gap. A conical discharge port is formed at the bottom of the upper powder cylinder, and the conical discharge port is connected to a stirring and dispersing cylinder. A conical cavity is formed at the bottom of the stirring and dispersing cylinder. A second motor is connected to the top of the stirring and dispersing cylinder, and the second motor is connected to a conical cross plate. A baffle is installed above the cross plate, and a material leakage port is formed at the outer end of the baffle. A gap is formed between the cross plate and the stirring and dispersing cylinder. A material guide channel is connected to the bottom of the conical cavity, and a dry powder roller pressing mechanism is located at the bottom of the material guide channel.

[0011] In a further improvement, the dry powder roller pressing mechanism includes two opposing first pressure rollers, the first pressure rollers being connected to a translation adjustment structure; a powder scraper is also installed in conjunction with the first pressure rollers; a position detection sensor is installed below the first pressure rollers; an arc-shaped guide plate is installed on the right side of the pressure rollers, and a pressing plate is installed in conjunction with the arc-shaped guide plate, the pressing plate being connected to an adjusting screw.

[0012] As a further improvement, the position detection sensor is an infrared beam sensor.

[0013] In a further improvement, the composite roller pressing mechanism includes a nickel mesh unwinding roller, a nickel mesh tensioning guide roller group and two opposing second pressure rollers arranged sequentially along the nickel mesh moving direction, one of the second pressure rollers being connected to a second lifting structure.

[0014] A further improvement is that the second lifting structure is a lead screw mechanism.

[0015] A further improvement is that the composite structure winding structure includes a composite structure winding roller and a composite structure guide roller that cooperates with the composite structure winding roller. The composite structure guide roller is equipped with an L-shaped mounting block, and a negative pressure powder suction port is installed on the mounting block.

[0016] Further improvements include an adhesive drying device, which includes a composite structure unwinding roller, a water spray nozzle, a composite structure adhesive coating roller mechanism, an oven, and a second composite structure take-up roller arranged sequentially along the direction of travel of the composite structure.

[0017] A method of using the above-mentioned lamination and bonding production line includes the following steps: Step 1: Place the dry powder material into the anti-clogging feeding mechanism of the powder nickel mesh bonding mechanism. The dry powder material is rolled into a dry powder thin strip by the dry powder rolling mechanism and falls down to form a U-shape. Then, it is rolled into a composite structure together with the nickel mesh by the composite rolling mechanism and wound up by the composite structure winding structure. Step 2: Install the wound composite structure onto the PTFE film press, so that the composite structure, PTFE film and paper tape pass through the vertical film coating roller pressing mechanism at the same speed. Then the paper tape unwinding mechanism takes up the paper tape, and the PTFE film and composite structure are rolled together to form a composite film structure, which is then wound and stored by the first composite structure unwinding mechanism. Step 3: Install the wound composite film structure onto the coating and drying device, then unwind it so that the side without PTFE film faces the coating roller of the composite structure coating roller mechanism for coating. After drying in the oven, it is wound up by the second composite structure take-up roller.

[0018] The beneficial effects of this invention are as follows: 1. This invention can effectively prevent powder from accumulating and sticking to the plate, ensuring that the dry powder strip can be smoothly and continuously rolled into shape.

[0019] 2. Roller lamination of PTFE film with paper tape effectively prevents wrinkling and damage to the PTFE film.

[0020] 3. During operation, the dry powder belt forms a U-shaped suspended structure, which provides better redundancy and effectively prevents it from being pulled apart by the two rollers. Attached Figure Description

[0021] The invention will be further illustrated with reference to the accompanying drawings, but the contents of the drawings do not constitute any limitation on the invention.

[0022] Figure 1 This is a schematic diagram of the structure of the nickel mesh lamination mechanism for powder materials; Figure 2 This is a schematic cross-sectional view of a PTFE membrane pressing machine. Figure 3 A three-dimensional structural diagram of a PTFE membrane pressing machine; Figure 4 This is a schematic diagram of the adhesive coating and drying device. Detailed Implementation

[0023] To make the purpose, technical solution, and advantages of the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and examples.

[0024] Example 1 A lamination production line includes a powder nickel mesh lamination mechanism 1, a PTFE membrane pressing machine 2, and an adhesive coating and drying device 3. The three devices can be used individually or connected to form a production line.

[0025] The powder nickel mesh laminating mechanism 1 includes an anti-clogging feeding mechanism, a dry powder rolling mechanism, a composite rolling mechanism, and a composite structure winding structure.

[0026] like Figure 1 As shown, the anti-clogging feeding mechanism includes an upper powder cylinder 101. An inlet 102 is formed at the top of the upper powder cylinder 101, and a first motor 103 is installed thereon. A partition 104 is fixed to the lower part of the upper powder cylinder 101. A discharge port 105 is formed on the partition 104 at a position offset from the inlet 102. A vertical partition 106 is fixed above the discharge port 105. A gap 107 is formed between the discharge port 105 and the bottom of the vertical partition 106. The first motor 103 is connected to a scraper 108 that cooperates with the gap 107. A conical discharge port 10 is formed at the bottom of the upper powder cylinder 101. 9. A conical discharge port 109 is connected to a stirring and dispersing cylinder 110, and a conical cavity 111 is formed at the lower part of the stirring and dispersing cylinder 110. A second motor 1112 is connected to the top of the stirring and dispersing cylinder 110, and a conical cross plate 112 is connected to the second motor 1112. A baffle 113 is installed above the cross plate 112, and a material leakage port 1131 is formed at the outer end of the baffle 113. A gap 114 is formed between the cross plate 112 and the stirring and dispersing cylinder 110. A material guiding channel 115 is connected to the bottom of the conical cavity 111, and a dry powder roller pressing mechanism is located at the bottom of the material guiding channel 115.

[0027] In operation, the first motor 103 is turned on, and the dry powder material is conveyed to the upper powder cylinder 101. The scraper 108 is driven to rotate by the first motor 103, gradually driving the material into the discharge port 105 to prevent excessive material from entering the mixing and dispersing cylinder 110 and to prevent powder from settling and caking. The material entering the mixing and dispersing cylinder 110 first enters the baffle 113, and then the second motor 1112 drives the baffle 113 to rotate, thus gradually falling from the discharge port 1131 into the gap 114, where it is stirred and dispersed by the rotating cross plate 112, and then evenly enters the guide channel 115, and then enters the dry powder roller pressing mechanism to be squeezed into a dry powder thin strip, thereby ensuring uniform material conveying and preventing material from accumulating and agglomerating at the outlet. The upper powder cylinder 101 and the mixing and dispersing cylinder 110 are made of plexiglass. An infrared detection device is installed inside the upper powder cylinder 101. The infrared detection automatically controls the discharge of powder from the upper powder cylinder and the intermediate cylinder based on the powder height.

[0028] The dry powder rolling mechanism includes two opposing first pressure rollers 116, each connected to a translation adjustment structure. A powder scraper is also installed in conjunction with the first pressure rollers 116. A position detection sensor 117, consisting of multiple sets of infrared beam sensors arranged from top to bottom, is installed below each first pressure roller 116. An arc-shaped guide plate 118 is installed on the right side of the first pressure roller 116, and a pressure plate 119 is installed in conjunction with the arc-shaped guide plate 118. The pressure plate 119 is connected to an adjusting screw 120. The first pressure rollers 116 are used to compress the dry powder into a thin strip. However, because the thin strip is prone to breakage under tension, and the speed between rollers cannot be kept constant due to electrical control and mechanical tolerances, therefore… Figure 1 As shown, the dry powder strip, after being formed into a U-shape, enters the re-combining roller pressing mechanism. This U-shape acts as a buffer between the dry powder pressing mechanism and the composite pressing mechanism. The length is detected by a position sensor 117. When the length exceeds a preset limit, the composite pressing mechanism is accelerated; when the length is less than the preset limit, the speed is reduced to prevent the mechanical tension between the two mechanisms from breaking the dry powder strip. The first pressure roller 116 uses a DYG-703A-Ф100X280 precision horizontal roller press with a surface roughness of 0.8μm and an accuracy of ±0.005mm. A receiving box is located below the first pressure roller 116 to catch and process any falling powder. The gap between the first pressure roller 116 is manually adjusted using a worm gear structure, with a gap between 0-1mm. The gap between the two rollers is displayed using a digital dial indicator.

[0029] The composite rolling mechanism includes a nickel mesh unwinding roller 121, a nickel mesh tensioning guide roller group 122, and two opposing second pressure rollers 123 arranged sequentially along the nickel mesh moving direction. One of the second pressure rollers 123 is connected to a second lifting structure 124, which is a screw mechanism. The nickel mesh unwinding roller 121 is used to unwind the nickel mesh. The nickel mesh is repeatedly bent by the nickel mesh tensioning guide roller group 122 to make it soft, and then it enters the space between the second pressure rollers 123 together with the dry powder tape and is rolled together, and then wound up by the composite structure winding structure. The composite structure winding structure includes a composite structure winding roller 125 and a composite structure guide roller 126 that cooperates with the composite structure winding roller 125. The composite structure guide roller 126 is equipped with an L-shaped mounting block 127, and a negative pressure powder suction port 128 is installed on the mounting block 127 to absorb the powder that detaches from the surface of the composite structure.

[0030] like Figure 2 and Figure 3 The PTFE film pressing machine 2 shown includes a vertical film pressing mechanism, a paper tape unwinding mechanism, a PTFE film unwinding mechanism, and a first composite structure unwinding mechanism.

[0031] The vertical laminating roller pressing mechanism includes a second frame 21, with fixed roller mounting frames 22 fixed on both sides of the middle of the second frame 21. Fixed rollers 23 are axially connected between the fixed roller mounting frames 22. A first lifting structure 24 is connected to the fixed roller mounting frames 22, and a pressure sensor 26 is connected to the first lifting structure 24. The pressure sensor 26 is communicatively connected to a pressure display screen 25. The pressure sensor 26 is connected to lifting roller mounting frames 27 that are slidably connected to the fixed roller mounting frames 22. Lifting rollers 28 are axially connected between the lifting roller mounting frames 27. The paper tape unwinding mechanism includes a paper tape unwinding roller 29 on one side of the fixed roller mounting frame 22 and a paper tape take-up roller 210 on the other side of the fixed roller mounting frame 22. The PTFE film unwinding mechanism includes a PTFE film unwinding roller 211 and a guide roller 212 on one side of the fixed roller mounting frame 22.

[0032] The first composite structure unwinding mechanism includes a first composite structure unwinding roller 213 located on one side of the fixed roller mounting frame 22 and a first composite structure take-up roller 214 located on the other side of the fixed roller mounting frame 22; two oppositely arranged guide plates 215 are installed on the feed side of the fixed roller 23 and the lifting roller 28.

[0033] In use, the composite structure is at the bottom, the PTFE film is in the middle, and the paper tape is at the top. Together, they enter between the lifting roller 28 and the fixed roller 23. The paper tape protects the PTFE film and ensures that the pressure between the rollers is evenly transmitted to the PTFE film, effectively preventing wrinkling. After rolling, the paper tape is wound up and reused. The PTFE film and the composite structure are pressed together to form a composite film structure, which is then wound up by the first composite structure winding roller 214.

[0034] A powder brush 216 and a negative pressure powder suction pipe 217 are provided on one side of the fixed roller mounting frame 22 for adsorbing and recovering powder that is not firmly adhered to the surface of the composite structure.

[0035] like Figure 4 As shown, the composite film structure is then placed into the coating and drying device 3. The coating and drying device 3 includes a composite structure unwinding roller 31, a water spray nozzle 32, a composite structure coating roller mechanism 33, an oven 34, and a second composite structure winding roller 35, arranged sequentially along the direction of travel of the composite structure. The coating and drying device 3 applies a layer of adhesive to the side without the PTFE film. After coating, the electrode sheet is dried in a horizontal drying oven and finally wound into a roll, thereby producing an electrode sheet whose size and weight meet the process requirements.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A lamination and composite production line, characterized in that, The system includes a nickel mesh laminating mechanism (1) and a PTFE film pressing machine (2); the nickel mesh laminating mechanism (1) includes an anti-clogging feeding mechanism, a dry powder roller pressing mechanism, a composite roller pressing mechanism and a composite structure winding structure; the PTFE film pressing machine (2) includes a vertical laminating roller pressing mechanism, a paper tape unwinding mechanism, a PTFE film unwinding mechanism and a first composite structure unwinding mechanism; the vertical laminating roller pressing mechanism includes a second frame (21), with fixed roller mounting frames (22) fixed on both sides of the middle part of the second frame (21), and fixed rollers (23) axially connected between the fixed roller mounting frames (22), a first lifting structure (24) connected to the fixed roller mounting frames (22), a pressure sensor (26) connected to the first lifting structure (24), a pressure display screen (25) connected to the pressure sensor (26), and a lifting roller mounting frame (27) slidably connected to the fixed roller mounting frame (22), with lifting rollers (28) axially connected between the lifting roller mounting frames (27); The paper tape unwinding mechanism includes a paper tape unwinding roller (29) on one side of the fixed roller mounting frame (22) and a paper tape take-up roller (210) on the other side of the fixed roller mounting frame (22). The PTFE film unwinding mechanism includes a PTFE film unwinding roller (211) and a guide roller (212) located on one side of the fixed roller mounting frame (22). The first composite structure unwinding mechanism includes a first composite structure unwinding roller (213) located on one side of the fixed roller mounting frame (22) and a first composite structure take-up roller (214) located on the other side of the fixed roller mounting frame (22); two oppositely arranged guide plates (215) are installed on the feed side of the fixed roller (23) and the lifting roller (28); The anti-clogging feeding mechanism includes an upper powder cylinder (101), with a feed inlet (102) formed at the top of the upper powder cylinder (101) and a first motor (103) installed thereon. A partition (104) is fixed at the lower part of the upper powder cylinder (101), and a discharge port (105) is formed on the partition (104) at a position offset from the feed inlet (102). A vertical partition (106) is fixed above the discharge port (105). A gap (107) is formed between the discharge port (105) and the bottom of the vertical partition (106). The first motor (103) is connected to a scraper (108) that cooperates with the gap (107). A conical discharge port (108) is formed at the bottom of the upper powder cylinder (101). 9) A conical discharge port (109) is connected to a stirring and dispersing cylinder (110), and a conical cavity (111) is formed at the bottom of the stirring and dispersing cylinder (110); a second motor (1112) is connected to the top of the stirring and dispersing cylinder (110), and a conical cross plate (112) is connected to the second motor (1112). A baffle (113) is installed above the cross plate (112), and a material leakage port (1131) is formed at the outer end of the baffle (113); a gap (114) is formed between the cross plate (112) and the stirring and dispersing cylinder (110); a material guiding channel (115) is connected to the bottom of the conical cavity (111), and a dry powder roller pressing mechanism is located at the bottom of the material guiding channel (115).

2. The lamination and composite production line as described in claim 1, characterized in that, A powder brush (216) and a negative pressure powder suction pipe (217) are provided on one side of the fixed roller mounting frame (22).

3. The lamination and composite production line as described in claim 1, characterized in that, The dry powder roller pressing mechanism includes two opposing first pressure rollers (116), the first pressure rollers (116) are connected to a translation adjustment structure; a powder scraper is also installed in conjunction with the first pressure rollers (116); a position detection sensor (117) is installed below the first pressure rollers (116); an arc-shaped guide plate (118) is installed on the right side of the first pressure rollers (116), and a pressing plate (119) is installed in conjunction with the arc-shaped guide plate (118), and an adjusting screw (120) is connected to the pressing plate (119).

4. The lamination and composite production line as described in claim 3, characterized in that, The position detection sensor (117) is an infrared beam sensor.

5. The lamination and composite production line as described in claim 1, characterized in that, The composite rolling mechanism includes a nickel mesh unwinding roller (121), a nickel mesh tensioning guide roller group (122), and two opposing second pressure rollers (123) arranged sequentially along the moving direction of the nickel mesh, one of which is connected to a second lifting structure (124).

6. The lamination and composite production line as described in claim 5, characterized in that, The second lifting structure (124) is a lead screw mechanism.

7. The lamination and composite production line as described in claim 1, characterized in that, The composite structure winding structure includes a composite structure winding roller (125) and a composite structure guide roller (126) that cooperates with the composite structure winding roller (125). The composite structure guide roller (126) is equipped with an L-shaped mounting block (127), and a negative pressure powder suction port (128) is installed on the mounting block (127).

8. The lamination and composite production line as described in claim 1, characterized in that, It also includes a coating and drying device (3), which includes a composite structure unwinding roller (31), a water spray nozzle (32), a composite structure coating roller mechanism (33), an oven (34), and a second composite structure take-up roller (35) arranged sequentially along the direction of travel of the composite structure.

9. A method of using the lamination and composite production line according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Place the dry powder material into the anti-blocking feeding mechanism of the powder nickel mesh composite mechanism (1). The dry powder material is rolled into a dry powder thin strip by the dry powder roller pressing mechanism and falls down to form a U-shape. Then, it is rolled into a composite structure by the composite roller pressing mechanism together with the nickel mesh and is wound up by the composite structure winding structure. Step 2: Install the wound composite structure onto the PTFE film press (2), so that the composite structure, PTFE film and paper tape pass through the vertical film pressing mechanism at the same speed. Then the paper tape unwinding mechanism rolls up the paper tape, and the PTFE film and composite structure are pressed together to form a composite film structure, which is then wound and stored by the first composite structure unwinding mechanism. Step 3: Install the wound composite film structure onto the coating and drying device (3), then unwind it so that the side without PTFE film faces the coating roller of the composite structure coating roller mechanism (33) for coating, and then dry it in the oven (34) before being wound up by the second composite structure winding roller (35).

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