A six-roller three-unroll dry composite film forming machine

Abstract

This invention relates to the field of lithium battery industry technology, and in particular to a six-roller three-unwind dry composite film forming machine; the first and second hot roller groups independently form films on both sides of the electrode sheet, and the third hot roller group hot-presses the double-sided coating with the foil material; each group of hot rollers is provided with clamping force by a hydraulic cylinder and precisely controlled by a roller gap adjustment component, which uses a wedge servo motor to drive the ball screw and wedge to achieve stable displacement of the bearing seat along the axis of the hydraulic cylinder; the electrode sheet is formed in one step through unwinding, double-sided coating, composite and rewinding, and the transmission stability is maintained by the cooperation of tension roller and over-roller, which significantly improves production efficiency and electrode sheet quality.

Description

Technical Field

[0001] This invention relates to the technical field of the lithium battery industry, and in particular to a six-roller three-unroll dry composite film forming machine. Background Technology

[0002] In the field of lithium-ion battery electrode manufacturing, dry film deposition technology is gradually becoming an important direction for industry technological upgrading due to its advantages such as no solvent recovery required, high environmental friendliness, and low energy consumption. Currently, most mainstream dry composite film deposition equipment in the industry adopts a multi-roller composite structure. However, this type of equipment generally suffers from a significant structural defect in actual production: it cannot simultaneously complete the coating of both sides of the electrode sheet in the same process. Due to the limitations of the equipment configuration, existing multi-roller composite film deposition machines are typically only equipped with single-sided coating and hot-pressing units, allowing only one surface of the foil to be coated and laminated. When battery design requires double-sided coating to enhance energy density, the existing production process is forced to be interrupted. The roll that has already undergone single-sided processing must be unloaded from the equipment, flipped or replaced, and re-threaded, tension-calibrated, and unwound before the coating operation on the other side can begin.

[0003] This intermittent, phased production method severely restricts large-scale production. The most direct impact is the disruption of the production cycle, requiring frequent equipment shutdowns for roll changes and alignment adjustments, significantly shortening effective operating time and making it difficult for overall capacity to meet the ever-increasing market demand. Even more serious is the difficulty in avoiding the process risks inherent in the secondary coating process. After the first coating, the rolls need to undergo storage, transfer, and re-loading, during which the foil is highly susceptible to deformation or displacement. When applying the second coating, it is difficult for the equipment to ensure that the second-coated area is perfectly aligned with the first-coated area in both the longitudinal and transverse directions. If the coating edges are misaligned or shifted between the two coatings, it not only wastes material but, more seriously, can lead to defects such as uneven surface density, exposed foil, or wavy edges on the electrode sheets, directly affecting the consistency and safety of the battery cells. Therefore, the industry urgently needs a film-forming equipment that can overcome the limitations of single-sided processing to address the pain points of low production efficiency and uncontrollable coating precision in existing processes.

[0004] Therefore, this application provides a six-roller three-unroll dry composite film forming machine to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a six-roller three-unwind dry lamination film forming machine, which solves the problems of existing dry lamination film forming machines that can only coat one side and require two unwindings for double-sided processing, resulting in low production efficiency and easy deviation of the secondary coating, affecting the quality of the electrode sheets.

[0006] To solve the above-mentioned technical problems, the present invention provides a six-roller three-unwind dry composite film forming machine, including a six-roller frame as the main support of the whole machine, an unwinding assembly fixedly installed at the upper center of the six-roller frame, a first hot roller group and a second hot roller group symmetrically arranged on both sides of the unwinding assembly within the orifice frame of the six-roller frame, and a third hot roller group arranged on the lower side of the unwinding assembly within the orifice frame of the six-roller frame; the first hot roller group and the second hot roller group are both configured to perform the film forming function of electrode coating, and the third hot roller group is configured to perform the composite film forming function, used to hot-press the A-side coating formed by the first hot roller group and the B-side coating formed by the second hot roller group with the foil output from the unwinding assembly to form the finished electrode sheet; The first, second, and third hot roller groups each consist of two hot rollers, with both ends of the hot rollers fixed to the six-roll frame via bearing seats. Feeding funnels are respectively installed above the first and second hot roller groups. A winding assembly is installed in the output direction of the third hot roller group. Passing rollers and tension rollers are arranged sequentially on the electrode transfer path between the unwinding assembly, the first, second, and third hot roller groups, and the winding assembly. After being released by the unwinding assembly, the electrode is guided through each hot roller group by passing rollers and tension rollers and is finally collected by the winding assembly.

[0007] A further improvement of the technical solution of the present invention is that: a hydraulic cylinder is configured on one side of at least one of the hot rollers in each group of hot rollers. The hydraulic cylinder is fixedly installed on the six-roll frame and acts on the bearing seat of the hot roller to provide the pressing driving force when the hot roller closes. The hot roller is kept in a rotating state through the bearing seat, and the rotation axes of the hot rollers are parallel to each other.

[0008] A further improvement to the technical solution of this invention is that: Roll gap adjustment components are provided at both ends of the roll gap between the two hot rollers in each group of hot rollers; two sets of roll gap adjustment components are correspondingly configured in each group of hot rollers, and the two sets of roll gap adjustment components are symmetrically arranged about the central axis of the hot rollers; the upper inclined iron is fixedly installed on the bearing seat of one of the hot rollers, the inclined iron guide plate is fixedly installed on the bearing seat of the other hot roller opposite to that hot roller, and the lower inclined iron is slidably mounted on the inclined iron guide plate, with the upper surface of the lower inclined iron and the lower surface of the upper inclined iron forming an inclined surface contact; the six-roll frame is fixedly... A servo motor for the inclined iron is fixedly installed. The output end of the servo motor is connected to the lower inclined iron via a ball screw. The servo motor drives the lower inclined iron to move up and down along the inclined iron guide plate perpendicular to the axis of the hot roller. The wedge-shaped thrust generated by the interaction between the upper and lower inclined irons pushes the bearing seat with the upper inclined iron to produce displacement along the axis of the hydraulic cylinder. In this process, the hydraulic cylinder provides the clamping driving force when the hot roller closes and also serves as a linear guide reference for the displacement of the bearing seat, restricting the degree of freedom of the bearing seat in the non-axial direction, thereby realizing the precise adjustment of the roll gap of the hot roller.

[0009] A further improvement of the technical solution of the present invention is that: the unwinding assembly includes a foil servo motor and a film air shaft. The foil servo motor is fixedly installed on the six-roll frame and is connected to the film air shaft for transmission. The foil servo motor drives the film air shaft to rotate at a constant linear speed to achieve constant tension unwinding of the foil. The structure of the winding assembly is the same as that of the unwinding assembly, which is also composed of a foil servo motor and a film air shaft, and is used to achieve constant tension winding of the finished electrode sheet.

[0010] A further improvement of the technical solution of the present invention is that: the first hot roller group and the second hot roller group are used to independently dry coat the A side and B side of the electrode sheet, respectively; the third hot roller group is located below the first hot roller group and the second hot roller group, and is used to hot press the double-layer coated film material processed by the first hot roller group and the second hot roller group with the bare foil material output by the unwinding assembly to form the finished electrode sheet.

[0011] A further improvement of the technical solution of the present invention is that: a main base plate is fixedly installed at the bottom of the six-roller frame, and the main base plate is fixedly connected to the ground foundation by anchor bolts; the six-roller frame adopts a mouth-shaped frame structure, and three sets of hot rollers are distributed on the six-roller frame in an inverted triangular shape.

[0012] A further improvement of the technical solution of the present invention is that: the guide roller is rotatably mounted on the six-roller frame through the bearing seat, and the tension roller is connected to the transmission path through the floating mechanism to adjust the tension of the electrode sheet in real time during the transmission process, so as to prevent the electrode sheet from wrinkling or breaking.

[0013] A further improvement of the technical solution of the present invention is that: in the output direction of the unwinding assembly, the first hot roller group, the second hot roller group and the third hot roller group, a guide roller and a tension roller are arranged sequentially along the transmission path; in the input direction of the winding assembly, a tension roller and a guide roller are arranged sequentially along the transmission path.

[0014] A further improvement of the technical solution of the present invention is that: the feeding funnel is fixedly suspended directly above the first hot roller group and the second hot roller group, and the discharge port of the feeding funnel is aligned with the roller gap inlet of the two groups of hot rollers, so as to uniformly introduce the coating into the space between the hot rollers for pressing into a film.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. The present invention provides a six-roll three-unwind dry lamination film forming machine. This film forming machine realizes integrated continuous production of double-sided coating and lamination of electrode sheets through the layout of the unwinding assembly in the center of the upper side of the six-roll frame and the first, second, and third hot roller groups on both sides and the lower side. Compared with the intermittent process of traditional single-sided coating equipment that requires secondary unwinding and flipping, this structure allows the foil to complete the A-side coating, B-side coating, and hot-press lamination of both sides with the foil in one conveyor belt process, completely eliminating the risk of coating area deviation caused by secondary loading and secondary alignment, and greatly improving the production cycle and dimensional accuracy of the finished electrode sheets.

[0016] 2. The present invention provides a six-roller three-release dry composite film forming machine. This film forming machine significantly improves the adjustment accuracy and stability of the hot roller gap by using the coordinated arrangement of hydraulic cylinders and roller gap adjustment components. By utilizing the hydraulic cylinder as both a pressing drive source and a linear guide reference for bearing seat displacement, combined with the wedge thrust mechanism of upper and lower wedges and ball screw transmission, the freedom of the bearing seat in the non-axial direction is restricted, so that the hot roller can maintain strict parallelism under high temperature and high pressure working conditions. This ensures the uniformity and consistency of the electrode coating thickness and solves the problem of roller gap drift caused by thermal expansion or vibration in traditional equipment.

[0017] 3. The present invention provides a six-roller three-unwind dry lamination film forming machine. The film forming machine ensures the tension stability and flatness of the electrode sheet during high-speed operation by arranging the unwinding assembly, the winding assembly, and the through rollers and tension rollers on the transmission path in a specific sequence. The constant tension unwinding and winding structure driven by the foil servo motor, combined with the unique path design of through rollers before tension rollers in the output direction and tension rollers before through rollers in the input direction, effectively absorbs the speed fluctuations between the hot roller groups, prevents the electrode sheet from wrinkling or stretching deformation during the lamination process, and ensures the uniform distribution of internal stress and excellent physical properties of the finished electrode sheet. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a six-roller, three-unroller, dry-winding composite film forming machine. Figure 2 for Figure 1 A sectional view; Figure 3 This is a schematic diagram of the assembly of the hot roller and the roller gap adjustment assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the hot roller of the present invention; Figure 5 This is a schematic diagram of the roller gap adjustment assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the winding assembly of the present invention.

[0020] Reference numerals: 1. Six-roll frame; 2. First hot roll assembly; 3. Second hot roll assembly; 4. Third hot roll assembly; 5. Hot roll; 6. Bearing housing; 7. Passing roll; 8. Tension roll; 9. Hydraulic cylinder; 10. Main machine base plate; 11. Feeding funnel; 12. Roll gap adjustment assembly; 121. Upper inclined plate; 122. Lower inclined plate; 123. Inclined plate guide plate; 124. Inclined plate servo motor; 125. Ball screw; 13. Rewinding assembly; 131. Foil servo motor; 132. Film air shaft; 14. Unwinding assembly. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The present invention will be further explained below with reference to specific embodiments.

[0025] like Figures 1-6As shown in the figure, this embodiment provides a six-roller three-unwind dry composite film forming machine, including a six-roller frame 1 as the main support of the whole machine. A main base plate 10 is fixedly installed at the bottom of the six-roller frame 1, and the main base plate 10 is fixedly connected to the ground foundation by anchor bolts. The six-roller frame 1 adopts a bevel frame structure. An unwinding assembly 14 is fixedly installed at the upper center of the six-roller frame 1. The first hot roller group 2 and the second hot roller group 3 are symmetrically arranged on both sides of the unwinding assembly 14 within the bevel frame of the six-roller frame 1, and a third hot roller group 4 is arranged on the lower side of the unwinding assembly 14, also within the bevel frame of the six-roller frame 1. The three groups of hot rollers 5 are distributed in an inverted triangular shape on the six-roller frame 1. The six-roller frame 1 adopts a high-rigidity bevel frame structure, which, together with the fixing method of the main base plate 10 and the anchor bolts, can effectively resist the reaction force generated during the pressing process of the hot rollers 5, prevent the equipment from deforming or resonating under high load operation, and thus ensure the long-term stability of electrode processing.

[0026] like Figure 1 , Figure 2 As shown, in this embodiment, the first hot roller group 2 and the second hot roller group 3 are both configured to perform the film-forming function of the electrode coating, respectively for independently dry coating film formation on the A side and B side of the electrode; the third hot roller group 4 is configured to perform the composite film-forming function, for hot-pressing the A side coating formed by the first hot roller group 2 and the B side coating formed by the second hot roller group 3 with the foil output from the unwinding assembly 14 to form the finished electrode. By symmetrically arranging the first hot roller group 2 and the second hot roller group 3 on both sides of the unwinding assembly 14, together with the third hot roller group 4 below, a compact triangular material flow path is formed, so that the electrode can simultaneously complete double-sided coating and hot-pressing composite in one continuous conveyor belt process, completely eliminating the coating deviation risk and production efficiency bottleneck caused by secondary unwinding in the traditional process.

[0027] like Figure 1 , Figure 2As shown, in this embodiment, the first hot roller assembly 2, the second hot roller assembly 3, and the third hot roller assembly 4 are each composed of two hot rollers 5. The two ends of the hot rollers 5 are fixed to the six-roll frame 1 through bearing seats 6. Feeding funnels 11 are respectively provided above the first hot roller assembly 2 and the second hot roller assembly 3. A winding assembly 13 is provided in the output direction of the third hot roller assembly 4. In the output direction of the unwinding assembly 14, the first hot roller assembly 2, the second hot roller assembly 3, and the third hot roller assembly 4, a guide roller 7 and a tension roller 8 are arranged sequentially along the transmission path. In the input direction of the winding assembly 13, a tension roller 8 and a guide roller 7 are arranged sequentially along the transmission path. The guide roller 7 is rotatably mounted on the six-roll frame 1 through bearing seats 6. The tension roller 8 is connected to the transmission path through a floating mechanism and is used to adjust the tension of the electrode sheet in real time during the transmission process to prevent the electrode sheet from wrinkling or breaking. The specific arrangement sequence of the guide roller 7 and tension roller 8, namely, that in the output direction of each hot roller group, the guide roller 7 is used first and then the tension roller 8 is used for adjustment, and in the winding input direction, the tension roller 8 is used first for buffering and then the guide roller 7 is used for guidance, can absorb the speed fluctuations caused by the rotation of the hot roller 5 to the greatest extent, and ensure that the electrode sheet is always in a flat and constant tension state before entering the next process, avoiding the electrode sheet stretching deformation or breakage caused by excessive local tension.

[0028] like Figure 1 , Figure 2 As shown, in this embodiment, a hydraulic cylinder 9 is disposed on one side of at least one of the hot rollers 5 in each group of hot rollers 5. The hydraulic cylinder 9 is fixedly mounted on the six-roll frame 1 and acts on the bearing seat 6 of the hot roller 5 to provide the clamping driving force when the hot roller 5 closes. The hot roller 5 is kept in a rotating state by the bearing seat 6, and the rotation axes of the hot roller 5 are parallel to each other. The hydraulic cylinder 9 not only serves as a power source to provide a constant clamping force when the hot roller 5 closes, ensuring that the hot rollers 5 maintain sufficient pressing force to achieve a firm bond between the coating and the foil, but also acts as a linear guide reference for the displacement of the bearing seat 6, using its own straightness to constrain the displacement trajectory of the bearing seat 6 and prevent the hot roller 5 from swaying under high pressure.

[0029] like Figures 2-5As shown, in this embodiment, roll gap adjustment components 12 are provided at both ends of the roll gap between the two hot rollers 5 in each group of hot rollers 5. Two sets of roll gap adjustment components 12 are configured in each group of hot rollers 5, and the two sets of roll gap adjustment components 12 are arranged symmetrically about the central axis of the hot rollers 5. The upper inclined iron 121 is fixedly installed on the bearing seat 6 of one of the hot rollers 5, and the inclined iron guide plate 123 is fixedly installed on the bearing seat 6 of the other hot roller 5 opposite to the hot roller 5. The lower inclined iron 122 is slidably mounted on the inclined iron guide plate 123, and the upper surface of the lower inclined iron 122 and the lower surface of the upper inclined iron 121 form an inclined surface contact. The inclined iron is fixedly installed on the six-roll frame 1. The output end of the servo motor 124 is connected to the lower wedge 122 via a ball screw 125. The wedge servo motor 124 drives the lower wedge 122 to move vertically along the wedge guide plate 123 perpendicular to the axis of the hot roller 5. The wedge thrust generated by the interaction between the upper wedge 121 and the lower wedge 122 pushes the bearing seat 6, which is equipped with the upper wedge 121, to move along the axis of the hydraulic cylinder 9. During this process, the hydraulic cylinder 9 provides the clamping driving force when the hot roller 5 closes, and also serves as the linear guide reference for the displacement of the bearing seat 6, restricting the degree of freedom of the bearing seat 6 in the non-axial direction, thereby realizing the precise adjustment of the roll gap of the hot roller 5. The roll gap adjustment assembly 12 drives the lower inclined iron 122, which is driven by the ball screw 125 and raised and lowered by the inclined iron servo motor 124. The wedge-shaped engagement between the upper inclined iron 121 and the lower inclined iron 122 converts the vertical motion into horizontal thrust, thereby precisely controlling the size of the roll gap of the hot roller 5. This structure, combined with the guiding action of the hydraulic cylinder 9, achieves micron-level adjustment accuracy and can effectively eliminate the backlash in the mechanical transmission, ensuring that the roll gap size remains stable under high temperature conditions, thereby ensuring the consistency of the electrode thickness.

[0030] like Figure 2 , Figure 6 As shown, in this embodiment, the unwinding assembly 14 includes a foil servo motor 131 and a film air shaft 132. The foil servo motor 131 is fixedly mounted on the six-roll frame 1 and is connected to the film air shaft 132 for transmission. The foil servo motor 131 drives the film air shaft 132 to rotate at a constant linear speed, thereby achieving constant tension unwinding of the foil. The winding assembly 13 has the same structure as the unwinding assembly 14, also consisting of a foil servo motor 131 and a film air shaft 132, and is used to achieve constant tension winding of the finished electrode sheet. The closed-loop control strategy of the foil servo motor 131 and the film air shaft 132 can adjust the output torque in real time according to the change of the unwinding diameter, ensuring that the electrode sheet maintains a constant linear speed and tension throughout the unwinding and winding process, avoiding wrinkling or interlayer misalignment of the electrode sheet caused by tension fluctuations.

[0031] like Figure 1 , Figure 2As shown, in this embodiment, the feeding funnel 11 is fixedly suspended directly above the first hot roller assembly 2 and the second hot roller assembly 3. The discharge port of the feeding funnel 11 is aligned with the roller gap inlet of the two sets of hot rollers 5, used to uniformly introduce the coating material between the hot rollers 5 for pressing into a film. The feeding funnel 11 adopts a low-position discharge design, with the discharge port close to the roller gap of the hot roller 5. Utilizing gravity and the traction of the hot rollers 5, the material is continuously and uniformly fed into the pressing zone, preventing the material from scattering or accumulating during the conveying process, thus ensuring the uniformity and density of the coating. After being released by the unwinding assembly 14, the electrode sheet is guided sequentially through the overroller 7 and tension roller 8 through each hot roller 5 and is finally collected by the winding assembly 13.

[0032] This invention also provides the working principle of a six-roller three-unroll dry composite film forming machine: When the equipment starts, the six-roll frame 1, fixed on the base plate 10 of the main unit, remains stable. The operator installs the foil roll to be processed onto the film air shaft 132 of the unwinding assembly 14. The foil servo motor 131 drives the film air shaft 132 to rotate and release the foil. After being guided by the guide roller 7 and adjusted by the floating tension roller 8, the foil is smoothly conveyed to the front of the third hot roller group 4 located below the six-roll frame 1. At the same time, the feeding funnel 11 continuously injects coating into the first hot roller group 2 and the second hot roller group 3 respectively. Under the pressing driving force provided by the hydraulic cylinder 9, the first hot roller group 2 and the second hot roller group 3 use the internally heated hot roller 5 to perform high-temperature rolling of the coating to form a uniform A-side and B-side coating. Then the foil passes through the roller gap of the third hot roller group 4. At this time, the third hot roller group 4 will press the first hot roller group 2 with the A-side coating. The film material output from the hot roller assembly 2, the film material output from the second hot roller assembly 3 with B-side coating, and the bare foil material input from the unwinding assembly 14 are subjected to three-layer co-extrusion hot-pressing composite. During this process, the hydraulic cylinder 9 not only provides pressure but also serves as a linear guide reference for the bearing seat 6. In conjunction with the wedge servo motor 124 in the roll gap adjustment assembly 12, the lower wedge 122 is driven to rise and fall along the wedge guide plate 123 via the ball screw 125. The wedge fit between the upper wedge 121 and the lower wedge 122 is used to precisely adjust the roll gap size to ensure the thickness tolerance of the composite electrode sheet. Finally, the finished composite electrode sheet is buffered and guided by the tension roller 8 and the overroller 7 in the input direction of the winding assembly 13. Then, the foil servo motor 131 of the winding assembly 13 drives the film air expansion shaft 132 to perform constant tension winding, thereby continuously completing the complete process of double-sided coating and composite film formation on one machine.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A six-roller, three-unroll, dry-film forming machine, characterized in that: The machine includes a six-roll frame (1) that serves as the main support for the entire machine. An unwinding assembly (14) is fixedly installed at the upper center of the six-roll frame (1). The first hot roller assembly (2) and the second hot roller assembly (3) are symmetrically arranged on both sides of the unwinding assembly (14) within the orifice frame of the six-roll frame (1). A third hot roller assembly (4) is also arranged on the lower side of the unwinding assembly (14) within the orifice frame of the six-roll frame (1). The first hot roller assembly (2) and the second hot roller assembly (3) are both configured to perform the film-forming function of the electrode coating. The third hot roller assembly (4) is configured to perform the composite film-forming function, which is used to hot-press the A-side coating formed by the first hot roller assembly (2) and the B-side coating formed by the second hot roller assembly (3) with the foil output by the unwinding assembly (14) to form the finished electrode. The first hot roller group (2), the second hot roller group (3), and the third hot roller group (4) are each composed of two hot rollers (5). The two ends of the hot rollers (5) are fixed to the six-roll frame (1) by bearing seats (6). Feeding funnels (11) are respectively set above the first hot roller group (2) and the second hot roller group (3). A winding assembly (13) is set in the output direction of the third hot roller group (4). A guide roller (7) and a tension roller (8) are arranged in sequence on the electrode transfer path between the unwinding assembly (14), the first hot roller group (2), the second hot roller group (3), the third hot roller group (4), and the winding assembly (13). After the electrode is released by the unwinding assembly (14), it is guided through the guide roller (7) and the tension roller (8) in sequence through each hot roller group and finally collected by the winding assembly (13).

2. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: At least one side of each set of hot rollers (5) is equipped with a hydraulic cylinder (9). The hydraulic cylinder (9) is fixedly installed on the six-roll frame (1) and acts on the bearing seat (6) of the hot roller (5) to provide the pressing driving force when the hot roller (5) closes. The hot roller (5) is kept in a rotating state through the bearing seat (6), and the rotation axes of the hot rollers (5) are parallel to each other.

3. The six-roller three-unroll dry composite film forming machine according to claim 2, characterized in that: Roll gap adjustment components (12) are provided at both ends of the roll gap between the two hot rollers (5) of each group of hot rollers (5). Two sets of roll gap adjustment components (12) are configured in each group of hot rollers (5), and the two sets of roll gap adjustment components (12) are arranged symmetrically about the central axis of the hot rollers (5). The upper inclined iron (121) is fixedly installed on the bearing seat (6) of one of the hot rollers (5), and the inclined iron guide plate (123) is fixedly installed on the bearing seat (6) of the other hot roller (5) opposite to the hot roller (5). The lower inclined iron (122) is slidably mounted on the inclined iron guide plate (123), and the upper surface of the lower inclined iron (122) and the lower surface of the upper inclined iron (121) form an inclined surface contact. The inclined iron servo motor is fixedly installed on the six-roll frame (1). (124) The output end of the wedge servo motor (124) is connected to the lower wedge (122) through the ball screw (125). The wedge servo motor (124) drives the lower wedge (122) to move up and down along the wedge guide plate (123) perpendicular to the axis of the hot roller (5). The wedge thrust between the upper wedge (121) and the lower wedge (122) pushes the bearing seat (6) on which the upper wedge (121) is installed to generate displacement along the axis of the hydraulic cylinder (9). In this process, the hydraulic cylinder (9) provides the clamping driving force when the hot roller (5) closes, and also serves as the linear guide reference for the displacement of the bearing seat (6), restricting the degree of freedom of the bearing seat (6) in the non-axial direction, thereby realizing the precise adjustment of the roll gap of the hot roller (5).

4. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: The unwinding assembly (14) includes a foil servo motor (131) and a film air shaft (132). The foil servo motor (131) is fixedly mounted on the six-roll frame (1) and is connected to the film air shaft (132) for transmission. The foil servo motor (131) drives the film air shaft (132) to rotate at a constant linear speed to achieve constant tension unwinding of the foil. The winding assembly (13) has the same structure as the unwinding assembly (14) and is also composed of a foil servo motor (131) and a film air shaft (132) to achieve constant tension winding of the finished electrode sheet.

5. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: The first hot roller assembly (2) and the second hot roller assembly (3) are used to independently dry-coat the A and B sides of the electrode sheet. The third hot roller assembly (4) is located below the first hot roller assembly (2) and the second hot roller assembly (3) and is used to hot-press the double-layer coated film after being processed by the first hot roller assembly (2) and the second hot roller assembly (3) with the bare foil output by the unwinding assembly (14) to form the finished electrode sheet.

6. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: The bottom of the six-roll frame (1) is fixedly provided with a main base plate (10), which is fixedly connected to the ground foundation by anchor bolts. The six-roll frame (1) adopts a mouth-shaped frame structure, and three sets of hot rollers (5) are distributed on the six-roll frame (1) in an inverted triangular shape.

7. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: The guide roller (7) is rotatably mounted on the six-roller frame (1) via the bearing seat (6), and the tension roller (8) is connected to the transmission path via a floating mechanism to adjust the tension of the electrode sheet in real time during the transmission process, so as to prevent the electrode sheet from wrinkling or breaking.

8. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: In the output direction of the unwinding assembly (14), the first hot roller group (2), the second hot roller group (3) and the third hot roller group (4), a guide roller (7) and a tension roller (8) are arranged sequentially along the transmission path; in the input direction of the winding assembly (13), a tension roller (8) and a guide roller (7) are arranged sequentially along the transmission path.

9. The six-roller three-unroll dry composite film forming machine according to claim 1, characterized in that: The feeding funnel (11) is fixedly suspended directly above the first hot roller group (2) and the second hot roller group (3). The outlet of the feeding funnel (11) is aligned with the roller gap inlet of the two groups of hot rollers (5) to uniformly introduce the coating material between the hot rollers (5) for pressing into a film.

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