Preparation equipment and preparation method of dry electrode composite lithium battery paper

Abstract

The invention discloses preparation equipment and a preparation method of dry electrode composite lithium battery paper. The preparation equipment of the dry electrode composite lithium battery paper comprises a first supporting wall plate and a second supporting wall plate which are oppositely arranged on a base, and a positive and negative pole piece manufacturing device, an isolating membrane unwinding device, a positive and negative pole piece flying shear stacking device and a composite lithium battery paper thermal compounding device which are assembled between the first supporting wall plate and the second supporting wall plate. The preparation method of the dry electrode composite lithium battery paper comprises the following steps: S1, quantitative feeding of positive and negative electrode dry pulp; s2, preparing positive and negative electrode membranes; s3, unwinding the positive and negative current collectors at constant tension; s4, trimming and shaping the positive and negative electrode films; s5, constant-tension unwinding of the isolating membrane; s6, carrying out flying shear cross-section stacking on the positive and negative pole pieces; and S7, thermally compounding the composite lithium battery paper. The manufacturing cost of the dry electrode composite lithium battery paper can be reduced, the environmental pollution can be reduced, and the method is suitable for preparing the dry electrode composite lithium battery paper.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium ion battery manufacturing, and relates to the preparation of dry electrode composite lithium battery paper, and specifically to a preparation device and a preparation method of dry electrode composite lithium battery paper. Background Art

[0002] Dry electrode composite lithium battery paper is a material used in the manufacture of lithium-ion batteries. With the development of the new energy market, lithium-ion batteries are being more widely used in all walks of life.

[0003] At present, in the manufacture of lithium-ion batteries at home and abroad, the process of positive and negative electrode fluid slurry, electrode coating, electrode drying, electrode rolling, electrode slitting, winding and lamination is usually adopted to produce the positive and negative electrode sheets of the battery, and then the positive and negative electrode sheets of the battery and the isolation film are wound or laminated into bare cells.

[0004] However, this production method usually requires the use of equipment such as coating machines, baking ovens, electrode rolling machines, slitting machines, winding machines and stacking machines. The use of such traditional large-scale equipment will lead to a series of problems such as large production line equipment investment, large floor space, long process route, low production efficiency, serious environmental pollution, high manufacturing cost, high solvent consumption, high energy consumption, and high pollution, resulting in waste of manpower, material resources, financial resources and energy. Summary of the invention

[0005] In order to solve the above deficiencies in the prior art, the present invention aims to provide a preparation device and a preparation method of dry electrode composite lithium battery paper, so as to achieve the purpose of reducing the production cost of dry electrode composite lithium battery paper and reducing pollution.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A preparation device for dry electrode composite lithium battery paper, comprising a first supporting wallboard and a second supporting wallboard arranged relatively on a base, a positive and negative electrode sheet making device assembled between the first supporting wallboard and the second supporting wallboard, a separator unwinding device, a positive and negative electrode sheet flying shear stacking device and a composite lithium battery paper thermal composite device; The positive and negative electrode sheet manufacturing device comprises a positive electrode sheet manufacturing unit and a negative electrode sheet manufacturing unit, wherein the positive electrode sheet output end of the positive electrode sheet manufacturing unit is connected to the positive electrode sheet input end of the positive and negative electrode sheet flying shear stacking device, and the negative electrode sheet output end of the negative electrode sheet manufacturing unit is connected to the negative electrode sheet input end of the positive and negative electrode sheet flying shear stacking device; The isolating film output end of the isolating film unwinding device is connected to the isolating film input end of the positive and negative electrode sheet flying shear stacking device; The output end of the positive and negative electrode sheet flying shear stacking device is connected to the input end of the composite lithium battery paper thermal composite device.

[0007] As a limitation of the present invention, the positive electrode sheet manufacturing unit includes a positive electrode dry slurry distribution assembly, a positive electrode film forming assembly whose feed end is connected to the discharge end of the positive electrode dry slurry distribution assembly, a positive current collector unwinding device for inputting a positive current collector, and a positive electrode film trimming and shaping assembly whose input end is connected to the output end of the positive electrode film forming assembly and the output end of the positive current collector unwinding device; The structure of the negative electrode sheet production unit is consistent with that of the positive electrode sheet production unit, including a negative electrode dry slurry cloth assembly, a negative electrode film forming assembly, a negative current collector unwinding assembly and a negative electrode film trimming and shaping assembly.

[0008] As a further limitation of the present invention, the positive electrode film forming assembly includes at least one pair of heated rollers rotating inwardly relative to each other.

[0009] As a further limitation of the present invention, two positive electrode dry pulp distribution assemblies and two negative electrode dry pulp distribution assemblies are provided; The positive electrode dry slurry distribution assembly includes a cylinder fixed to a supporting wall panel by a fixing flange, a feed port opened on the side of the cylinder, a servo motor screw feeder fixed at the top of the cylinder and with the power output end vertically downward through the top wall of the cylinder and located inside the cylinder, and a distribution port fixed at the bottom of the cylinder.

[0010] As a further limitation of the present invention, the positive electrode film forming assembly includes a positive electrode primary film forming roller system and a positive electrode secondary film forming roller system, wherein the positive electrode primary film forming roller system includes two pairs of heating rollers, and the positive electrode secondary film forming roller system includes a pair of heating rollers, and the extrusion position of each pair of heating rollers in the positive electrode primary film forming roller system is respectively connected with the feeding ports of the two positive electrode dry slurry feeding assemblies; Each pair of heating rollers includes a fixed heating roller and a movable heating roller, and the movable heating roller can move in the horizontal radial direction. The input end of the positive electrode secondary film-forming roller system is connected with the two output ends of the positive electrode primary film-forming roller system, and the input end of the positive electrode secondary film-forming roller system is located in the middle position of the two output ends of the positive electrode primary film-forming roller system.

[0011] As a further limitation of the present invention, the positive current collector unwinding device includes a current collector inflation shaft for installing the current collector roll, a current collector tension sensor for testing the current collector tension, and current collector guide rollers for changing the movement direction of the current collector so that the current collector is located on both sides of the sensor after bypassing the sensor.

[0012] As a further limitation of the present invention, the positive electrode film trimming and shaping assembly includes a tool holder, a blade fixed to the movable end of the tool holder, and a heating back roller for heating and compounding the materials output by the positive electrode secondary film forming roller system and the positive current collector unwinding device.

[0013] As a further limitation of the present invention, the isolation film unwinding device includes an isolation film air inflation shaft for installing the isolation film roll, an isolation film tension sensor for detecting the tension of the isolation film, and isolation film guide rollers for changing the movement direction of the isolation film so that the isolation film is located on both sides of the sensor after bypassing the sensor.

[0014] As another limitation of the present invention, the positive and negative electrode sheet flying shear stacking device includes a positive electrode sheet clamping roller for conveying positive electrode sheets, a negative electrode sheet clamping roller for conveying negative electrode sheets, a positive electrode sheet anvil for guiding the positive electrode sheets, a negative electrode sheet anvil for guiding the negative electrode sheets, an isolation membrane channel arranged between the positive electrode sheet anvil and the negative electrode sheet anvil for the isolation membrane to pass through, an isolation membrane guiding roller for introducing the isolation membrane into the isolation membrane channel, a positive electrode sheet feeding positioning roller located on the side of the positive electrode sheet anvil away from the isolation membrane channel for positioning and conveying the positive electrode sheet, a negative electrode sheet feeding positioning roller located on the side of the negative electrode sheet anvil away from the isolation membrane channel for positioning and conveying the negative electrode sheet, a positive electrode sheet flying shear located on the side of the positive electrode sheet anvil away from the isolation membrane channel, and a negative electrode sheet flying shear located on the side of the negative electrode sheet anvil away from the isolation membrane channel.

[0015] As a further limitation of the present invention, the positive electrode sheet flying shear includes a first cylinder whose power output end is perpendicular to the positive electrode sheet anvil and a first cutter head fixed at the power output end of the first cylinder, and the negative electrode sheet flying shear includes a second cylinder whose power output end is perpendicular to the negative electrode sheet anvil and a second cutter head fixed at the power output end of the second cylinder.

[0016] As a further limitation of the present invention, the composite lithium battery paper thermal composite device comprises a relatively arranged movable thermal composite unit and a fixed thermal composite unit, wherein the movable thermal composite unit comprises a feed guide roller, a composite lithium battery paper movable heating roller, a discharge guide roller, and a steel belt arranged around the feed guide roller, the composite lithium battery paper movable heating roller, and the discharge guide roller, which are arranged in sequence on the same tangent line; The fixed thermal composite unit includes a feed guide roller, a composite lithium battery paper fixed heating roller, a discharge guide roller, and a steel belt arranged in sequence on the same tangent line around the feed guide roller, the composite lithium battery paper fixed heating roller and the discharge guide roller.

[0017] As a further limitation of the present invention, the fixed heating roller, the movable heating roller, the fixed heating roller for composite lithium battery paper and the movable heating roller for composite lithium battery paper have the same structure, and all include a journal bearing, a heating roller body sleeved on the journal bearing and a heating tube passed through the interior of the heating roller body.

[0018] The present invention also discloses a method for preparing a dry electrode composite lithium battery paper. The method is based on the preparation device for the dry electrode composite lithium battery paper according to claim 1 and specifically comprises the following steps: S1. Quantitative feeding of positive and negative electrode dry slurry: quantitatively feeding the positive electrode film forming assembly and the negative electrode film forming assembly respectively through the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly; S2. Preparation of positive and negative electrode films: the positive electrode dry slurry provided by the positive electrode dry slurry distribution assembly enters the positive electrode primary film-forming roller system to be made into a positive electrode primary film, and then the positive electrode primary film enters the positive electrode secondary film-forming roller system to be made into a positive electrode composite film; the negative electrode dry slurry provided by the negative electrode dry slurry distribution assembly enters the negative electrode primary film-forming roller system to be made into a negative electrode primary film, and then the negative electrode primary film enters the negative electrode secondary film-forming roller system to be made into a negative electrode composite film; S3, constant tension unwinding of positive and negative current collectors: constant tension unwinding of the positive current collector roll and the negative current collector roll is performed by a positive current collector unwinding device and a negative current collector unwinding device; S4, positive and negative electrode film trimming and shaping: the positive electrode composite film and the negative electrode composite film enter the positive electrode film trimming and shaping device and the negative electrode film trimming and shaping device to be compounded and trimmed with the positive current collector and the negative current collector, and the positive electrode sheet and the negative electrode sheet are output; S5, constant tension unwinding of the isolation film: the isolation film roll is unwound with constant tension by the isolation film unwinding device; S6, positive and negative electrode sheet flying shear cross-section stacking: After the positive electrode sheet, the negative electrode sheet and the separator enter the positive and negative electrode sheet flying shear stacking device, the positive electrode sheet and the negative electrode sheet are cut into fixed-length sections, and at the same time, the positive electrode sheet, the negative electrode sheet and the separator are transported to the discharge end of the positive and negative electrode sheet flying shear stacking device, and stacking is completed at the discharge end; S7. Thermal composite of composite lithium battery paper: The positive and negative electrode sheets and isolation membrane outputted from the positive and negative electrode sheet flying shear cross-cutting stacking device are inputted into the thermal composite device for composite lithium battery paper, and thermal composite is completed in the thermal composite device for composite lithium battery paper to produce the final dry electrode composite lithium battery paper.

[0019] As a limitation of the present invention, in step S1, by setting the torque threshold of the servo motor screw feeder in the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly to 100Nm±3Nm, the positive electrode dry slurry and the negative electrode dry slurry are pressed out from the distribution port at a constant speed, thereby completing the feeding of the positive electrode film forming assembly.

[0020] As a further limitation of the present invention, step S2 is divided into the following two steps: (1) Adjustment of heating roller values: The temperature threshold of each heating roller in the positive electrode film forming assembly and the negative electrode film forming assembly is set to 230°C ± 5°C, and the speed threshold is set to the reference line speed, which is 4m / min-6.5m / min, so as to achieve a micro-tension rolling of 0.5Nm ± 0.05Nm for the positive electrode primary film and the negative electrode primary film; (2) Adjustment of the spacing between the heating rollers: In the positive electrode primary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.68 mm; in the negative electrode primary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.24 mm; in the positive electrode secondary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 1.35 mm; in the negative electrode secondary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.47 mm.

[0021] As a further limitation of the present invention, in step S3, the tension threshold of the current collector inflation axis needs to be set to 10 Nm±1 Nm.

[0022] As a further limitation of the present invention, in step S4, the rotation speed of the heated back roller is set to the baseline linear speed, and the gap between the blade and the heated back roller is adjusted at the same time, wherein in the positive electrode film trimming and shaping assembly, the gap between the blade and the heated back roller is 0.012 mm, and in the negative electrode film trimming and shaping assembly, the gap between the blade and the heated back roller is 0.008 mm.

[0023] As another limitation of the present invention, in step S5, the tension threshold of the isolation membrane air expansion shaft is set to 5Nm±1Nm.

[0024] As a further limitation of the present invention, in step S6, the rotation speed thresholds of the positive electrode sheet clamping roller, the positive electrode sheet feeding and positioning roller, the negative electrode sheet clamping roller, and the negative electrode sheet feeding and positioning roller are set as the reference linear speed, and the frequencies of the first cylinder and the second cylinder are adjusted to ensure that the positive electrode sheet flying shear and the negative electrode sheet can cut the positive and negative electrode sheets to a fixed length.

[0025] As a further limitation of the present invention, in step S7, it is necessary to adjust the spacing between the fixed heating roller of the composite lithium battery paper and the movable heating roller of the composite lithium battery paper to 2.181mm±0.002mm, and then perform thermal composite on the composite lithium battery paper through the composite lithium battery paper heating roller and steel belt in the composite lithium battery paper thermal composite device, and finally produce the composite lithium battery paper, wherein the rotation speed of the composite lithium battery paper heating roller is set to the baseline line speed.

[0026] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: (1) The present invention designs a highly integrated dry electrode composite lithium battery paper preparation device, by rationally arranging the separator unwinding device, the positive and negative electrode sheet making device, the positive and negative electrode sheet flying shear stacking device, and the composite lithium battery paper thermal composite device according to the process in an area formed by two supporting wall panels, the turnover distance between the various devices is greatly reduced, the production efficiency is improved, and because it replaces the traditional large-scale equipment, the equipment investment and land and plant occupation are reduced, the efficiency is improved, and the manufacturing cost is reduced.

[0027] (2) In the present invention, the preparation and compounding of the positive and negative electrode membranes are completed by heated rollers, and the heating efficiency is relatively high. Compared with the existing large-area heating and baking method of the oven, the volatilization of harmful gases is greatly curbed, which is beneficial to environmental protection.

[0028] (3) In the present invention, a servo motor screw feeder is provided in the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly, which can adjust the feeding speed to achieve uniform feeding of the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly.

[0029] (4) The present invention is provided with a positive electrode primary film-forming roller system, a positive electrode secondary film-forming roller system, a negative electrode primary film-forming roller system and a negative electrode secondary film-forming roller system, which are heated and composited twice, so that the density of the produced positive electrode composite film and negative electrode composite film can be made more uniform.

[0030] (5) In the present invention, each pair of heating rollers includes a fixed heating roller and a movable heating roller. The movable heating roller can be moved to change the distance between the two heating rollers to adapt to the production of dry electrode composite lithium battery paper of different models.

[0031] (6) In the present invention, both the current collector unwinding device and the isolation membrane unwinding device are provided with tension sensors, which can control the unwinding speed to ensure that the current collector and the isolation membrane are always in an unfolded state, without generating wrinkles or breaking due to excessive tension.

[0032] (7) The present invention is provided with a positive electrode film trimming and shaping assembly and a negative electrode film trimming and shaping assembly, which can trim and shape the positive and negative electrode sheets, so that the output positive and negative electrode sheets are more regular.

[0033] (8) The composite lithium battery paper thermal composite device of the present invention is provided with a steel belt, which can ensure that the elongation of the composite lithium battery paper is minimized and the compaction density is maximized during thermal composite bonding.

[0034] (9) The present invention has designed a method for preparing dry electrode composite lithium battery paper with a simple process. The preparation of dry electrode composite lithium battery paper can be completed in seven steps: quantitative feeding of positive and negative electrode dry slurry, preparation of positive and negative electrode membranes, constant tension unwinding of positive and negative current collectors, trimming and shaping of positive and negative electrode membranes, constant tension unwinding of isolation membranes, flying shearing and cross-cutting and stacking of positive and negative electrode sheets, and thermal compounding of composite lithium battery paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the positive electrode dry slurry cloth assembly in an embodiment of the present invention; Figure 3 Schematic diagram of the structure of the positive electrode primary film-forming roller system in an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the heating roller in the embodiment of the present invention; Figure 5 Schematic diagram of the structure of the positive current collector unwinding device in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the positive electrode film trimming and shaping assembly in an embodiment of the present invention; Figure 7 It is a structural schematic diagram of a release film unwinding device in an embodiment of the present invention; Figure 8 Schematic diagram of the structure of the positive and negative electrode sheet flying shear stacking device in an embodiment of the present invention; Fig. 9 It is a schematic structural diagram of a thermal composite device for composite lithium battery paper according to an embodiment of the present invention; Fig.10 This is a schematic diagram of the direction of output in an embodiment of the present invention; In the figure: 1. Base; 2. Support wallboard; 3. Positive electrode dry slurry distribution assembly; 4. Positive electrode primary film forming roller system; 5. Positive electrode secondary film forming roller system; 6. Positive current collector unwinding device; 7. Positive electrode film trimming and shaping assembly; 8. Separator film unwinding device; 9. Positive and negative electrode sheet flying shear stacking device; 10. Composite lithium battery paper thermal composite device; 31. Cylinder; 32. Feeding port; 33. Servo motor screw feeder; 34. Material distribution port; 41. Heating roller; 411, journal bearing; 412, heating tube; 413, heating roller body; 61. Current collector inflation shaft; 62. First guide roller; 63. Second guide roller; 64. Third guide roller; 65. Current collector tension sensor; 66. Current collector roll; 71. knife holder; 72. blade; 73. heated backing roller; 81. Isolation film air expansion shaft; 82. Fourth guide roller; 83. Fifth guide roller; 84. Isolation film tension sensor; 85. Isolation film roll; 91. positive electrode sheet clamping roller; 92. negative electrode sheet clamping roller; 93. sixth guide roller; 94. negative electrode sheet anvil; 95. positive electrode sheet anvil; 96. negative electrode sheet feeding and positioning roller; 97. positive electrode sheet feeding and positioning roller; 98. negative electrode sheet flying shear; 99. positive electrode sheet flying shear; 910. isolation membrane channel; 101, feed guide roller; 102, composite lithium battery paper movable heating roller; 103, discharge guide roller; 104, composite lithium battery paper fixed heating roller; A, positive electrode primary film; B, positive electrode composite film; C, positive current collector; D, positive electrode sheet; E, negative electrode primary film; F, negative electrode composite film; G, negative current collector; H, negative electrode sheet; I, isolation film; J, dry electrode composite lithium battery paper. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention, and are not used to limit the present invention.

[0038] The first embodiment of the present invention is a preparation device for a dry electrode composite lithium battery paper, such as Figure 1 As shown, it includes a base 1 and a supporting wall panel 2 fixed on the base 1, the supporting wall panel 2 includes a first supporting wall panel and a second supporting wall panel arranged opposite to each other, and a positive and negative electrode sheet making device, an isolation film unwinding device 8, a positive and negative electrode sheet flying shear stacking device 9 and a composite lithium battery paper thermal composite device 10 are installed between the first supporting wall panel and the second supporting wall panel.

[0039] 1. Positive and negative electrode production device The positive and negative electrode sheet manufacturing device comprises a positive electrode sheet manufacturing unit and a negative electrode sheet manufacturing unit of the same structure, and the positive electrode sheet manufacturing unit and the negative electrode sheet manufacturing unit are symmetrically arranged with the support wallboard 2 being perpendicular to the symmetry axis of the base 1. The positive electrode sheet manufacturing unit comprises a positive electrode dry slurry cloth assembly 3 fixed on the top of the support wallboard 2, a positive electrode film forming assembly fixed on the upper part of the support wallboard 2, a positive current collector unwinding device 6 fixed on the support wallboard 2, and a positive electrode film trimming and shaping assembly 7 fixed on the support wallboard 2.

[0040] The negative electrode sheet manufacturing unit comprises a negative electrode film forming assembly, a negative electrode dry slurry cloth assembly, a negative current collector unwinding device and a negative electrode film trimming and shaping assembly, which have the same structure as the positive electrode sheet manufacturing unit.

[0041] (1) Positive electrode dry slurry cloth assembly 3 The positive electrode dry slurry cloth assembly 3 is provided with two, such as Figure 2 As shown, the positive electrode dry slurry distribution assembly 3 includes a cylinder 31 fixed to the top of the supporting wall panel 2 by a fixing flange, a feed port 32 opened on the side surface of the cylinder 31, a servo motor screw feeder 33 fixed on the top of the cylinder 31 and with the power output end vertically downward through the top wall of the cylinder 31 and located inside the cylinder 31, and a distribution port 34 fixed at the bottom of the cylinder 31.

[0042] (2) Positive electrode film forming component The positive electrode film forming assembly includes a positive electrode primary film forming roller system 4 and a positive electrode secondary film forming roller system 5, such as Figure 3As shown, the positive electrode primary film-forming roller system 4 includes two pairs of heating rollers 41 that are arranged in sequence in the horizontal direction and rotate inward relative to each other, and the positive electrode secondary film-forming roller system 5 includes a pair of heating rollers 41 that rotate inward relative to each other; each pair of heating rollers 41 includes a fixed heating roller and a movable heating roller, and the fixed heating rollers in the two pairs of heating rollers in the positive electrode primary film-forming roller system 4 are adjacent to each other, and the positive electrode secondary film-forming roller system 5 is located directly below the two fixed heating rollers.

[0043] In actual use, the positive electrode dry slurry in the two positive electrode dry slurry distribution assemblies 3 will enter the positive electrode primary film-forming roller system 4 from the distribution port 34 under the extrusion of the servo motor screw feeder 33, forming two positive electrode primary films A. The two positive electrode primary films A enter the positive electrode secondary film-forming roller system 5 to produce a positive electrode composite film B.

[0044] It should be added here that the feeding ports 34 of the two positive electrode dry slurry feeding assemblies 3 are respectively located above the middle extrusion position of each pair of heated rollers in the positive electrode primary film-forming roller system 4, so that the positive electrode dry slurry can be directly film-formed once after being pressed out from the feeding ports 34.

[0045] (3) Positive current collector unwinding device 6 like Figure 5 As shown, the positive current collector unwinding device 6 includes a current collector inflation shaft 61, a current collector tension sensor 65 and a current collector guide roller, wherein the current collector inflation shaft 61 is fixed in the horizontal direction of the positive electrode secondary film-forming roller system 5 and close to the edge of the supporting wallboard 2 of the positive electrode secondary film-forming roller system 5.

[0046] The current collector guide rollers include a first guide roller 62, a second guide roller 63 and a third guide roller 64 with the same structure. The first guide roller 62 is located between the current collector inflation shaft 61 and the positive electrode secondary film-forming roller system 5, the second guide roller 63 is located directly below the movable heating roller in the positive electrode secondary film-forming roller system 5, and the third guide roller 64 is located directly below the fixed heating roller in the positive electrode secondary film-forming roller system 5 and the bottom of the third guide roller 64 is tangent to the top of the second guide roller 63.

[0047] The radius of the current collector tension sensor 65 is the same as that of the current collector guide roller, and the current collector tension sensor 65 and the second guide roller 63 are located on the same horizontal line.

[0048] In actual applications, the positive current collector C will sequentially bypass the first guide roller 62, the second guide roller 63, the current collector tension sensor 65 and the third guide roller 64 to enter the subsequent process.

[0049] It should be added here that: the inflation shaft is equipped with a current collector roll 66, wherein the current collector roll 66 equipped on the inflation shaft of the positive current collector unwinding device 6 is made of aluminum, and the current collector roll 66 equipped on the inflation shaft of the negative current collector unwinding device is made of copper.

[0050] (4) Positive electrode film trimming and shaping assembly 7 The positive electrode film trimming and shaping assembly 7 is located between the positive electrode secondary film forming roller system 5 and the supporting wall plate 2 perpendicular to the symmetry axis of the base 1, as shown in FIG. Figure 6 As shown, the positive electrode film trimming and shaping assembly 7 includes a tool holder 71 fixed on the supporting wall panel 2, a blade 72 fixed on the movable end of the tool holder 71 and a heating back roller 73 fixed on the supporting wall panel 2, wherein the heating back roller 73 is located directly below the blade 72.

[0051] In actual use, the positive electrode composite film B will enter the positive electrode film trimming and shaping assembly 7 together with the positive current collector C, and be compounded on the heated back roller 73. At the same time, the blade 72 will cut off the burrs of the positive electrode composite film B to produce a regular positive electrode sheet D.

[0052] 2. Release film unwinding device 8 like Figure 7 As shown, the isolation film unwinding device 8 includes an isolation film air inflation shaft 81 fixedly arranged at the middle top position of the supporting wall panel 2, an isolation film roll 85 installed on the air inflation shaft, an isolation film tension sensor 84 fixedly arranged on the supporting wall panel 2 and an isolation film guide roller fixedly arranged on the supporting wall panel 2, wherein the isolation film guide roller includes a fourth guide roller 82 and a fifth guide roller 83 with the same structure, the bottom of the fourth guide roller 82 is tangent to the top of the isolation film tension sensor 84, the top of the fifth guide roller 83 is tangent to the bottom of the isolation film tension sensor 84, and the end of the fifth guide roller 83 away from the isolation film tension sensor 84 is tangent to the symmetry axis of the supporting wall panel 2 perpendicular to the base 1.

[0053] In actual use, the isolation film I will bypass the fourth guide roller 82, the isolation film tension sensor 84 and the fifth guide roller 83 in sequence and enter the next step.

[0054] 3. Positive and negative electrode sheet flying shear stacking device 9 like Figure 8 As shown, the positive and negative electrode sheet flying shear stacking device 9 includes a positive electrode sheet clamping roller 91, a negative electrode sheet clamping roller 92, an isolation film guide roller, a positive electrode sheet anvil 95, a negative electrode sheet anvil 94, an isolation film channel 910, a positive electrode sheet feeding and positioning roller 97, a negative electrode sheet feeding and positioning roller 96, a positive electrode sheet flying shear 99 and a negative electrode sheet flying shear 98.

[0055] The positive electrode sheet clamping roller 91 and the negative electrode sheet clamping roller 92 are both composed of a pair of tangentially arranged guide rollers. The positive electrode sheet clamping roller 91 is located on the side close to the positive electrode sheet manufacturing device, and the negative electrode sheet clamping roller 92 is located on the side close to the negative electrode sheet manufacturing device. The isolation membrane guide roller is the sixth guide roller 93, which is located directly below the fifth guide roller 83 and the bottom of the isolation membrane guide roller is tangent to the central axis of the isolation membrane channel 910.

[0056] The gap between the positive electrode anvil 95 and the negative electrode anvil 94 constitutes the isolation membrane channel 910. The positive electrode anvil 95 and the negative electrode anvil 94 are symmetrically arranged with the central axis of the isolation membrane channel 910 as the symmetry axis. The cross-sections of the positive electrode anvil 95 and the negative electrode anvil 94 are both right-angled trapezoids. The lower bottoms of the positive electrode anvil 95 and the negative electrode anvil 94 constitute the isolation membrane channel 910. One side of the waist perpendicular to the upper and lower bottoms is the feed end of the positive and negative electrode sheet flying shear stacking device 9, and one side of the other waist is the discharge end of the positive and negative electrode sheet flying shear 98 stacking device 9.

[0057] There are eight positive electrode sheet feeding positioning rollers 97 and eight negative electrode sheet feeding positioning rollers 96 , respectively, which are evenly distributed at the boundaries of the positive electrode sheet anvil 95 and the negative electrode sheet anvil 94 away from the isolation membrane channel 910 .

[0058] The positive electrode sheet flying shear 99 is fixed on the supporting wall panel 2 and is located on the side of the positive electrode sheet anvil 95 away from the isolation membrane channel 910. The negative electrode sheet flying shear 98 is fixed on the supporting wall panel 2 and is located on the side of the negative electrode sheet anvil 94 away from the isolation membrane channel 910. The positive electrode sheet flying shear 99 includes a first cylinder fixed on the supporting wall panel 2 and the power output end is perpendicular to the positive electrode sheet anvil 95 and a first cutter head fixed on the power output end of the first cylinder. The negative electrode sheet flying shear 98 includes a second cylinder fixed on the supporting wall panel 2 and the power output end is perpendicular to the negative electrode sheet anvil 94 and a second cylinder cutter head fixed on the power output end of the second cylinder.

[0059] In actual use, the positive electrode sheet D will pass through the positive electrode sheet clamping roller 91 to enter between the positive electrode sheet anvil 95 and the positive electrode sheet feeding and positioning roller 97, and at the same time, the positive electrode sheet flying shear 99 will evenly cut the positive electrode sheet D. The negative electrode sheet H will pass through the negative electrode sheet clamping roller 92 to enter between the negative electrode sheet anvil 94 and the negative electrode sheet feeding and positioning roller 96, and at the same time, the negative electrode sheet flying shear 98 will evenly cut the negative electrode sheet H. After the isolation membrane I passes through the sixth guide roller 93 and enters the isolation membrane channel 910, it enters the subsequent process from the discharge end together with the positive electrode sheet D and the negative electrode sheet H.

[0060] 4. Composite lithium battery paper thermal composite device 10 like Fig. 9As shown, the composite lithium battery paper thermal composite device 10 includes a movable thermal composite unit and a fixed thermal composite unit, wherein the movable thermal composite unit includes a feed guide roller 101, a composite lithium battery paper movable heating roller 102, a discharge guide roller 103 arranged in sequence on the same straight line, and a steel belt arranged around the feed guide roller 101, the composite lithium battery paper heating roller and the discharge guide roller 103, wherein the feed guide roller 101, the composite lithium battery paper movable heating roller 102 and the discharge guide roller 103 are all tangent to the straight line, and the composite lithium battery paper movable heating roller 102 can move in the vertical direction; the fixed thermal composite unit has the same structure as the movable thermal composite unit, but the composite lithium battery paper movable heating roller 102 in the fixed thermal composite unit is replaced by a composite lithium battery paper fixed heating roller 104, and the fixed thermal composite unit is symmetrically arranged with the movable thermal composite unit with the straight line as the axis of symmetry.

[0061] In actual application, the positive electrode sheet D, isolation film I and negative electrode sheet H outputted and stacked by the positive and negative electrode sheet H flying shear 98 stacking device 9 are put into the active thermal composite unit and the fixed thermal composite unit for thermal composite, and finally the dry electrode composite lithium battery paper J is produced.

[0062] The structures of the fixed heating roller, the movable heating roller, the composite lithium battery paper fixed heating roller and the composite lithium battery paper movable heating roller are consistent, such as Figure 4 As shown, they all include a journal bearing 411, a heating roller body 413 sleeved on the journal bearing 411, and a heating tube 412 passing through the heating roller body 413; In addition, a movable bearing seat is installed at the end of the journal bearing 411 of the movable heating roller and the composite lithium battery paper movable heating roller, and the movable bearing seat can be used to move the movable heating roller and the composite lithium battery paper movable heating roller.

[0063] When using this embodiment, if Fig.10 As shown, first, the positive electrode dry slurry and the negative electrode dry slurry are added to the positive electrode dry slurry distributing assembly 3 and the negative electrode dry slurry distributing assembly respectively, and then the servo motor screw feeder 33 is started to make the positive electrode dry slurry and the negative electrode dry slurry enter the positive electrode film forming assembly and the negative electrode film forming assembly respectively, and produce the positive electrode composite film B and the negative electrode composite film F, the positive electrode composite film B and the positive current collector C provided by the positive current collector unwinding assembly enter the positive electrode film trimming and shaping assembly 7 to produce the positive electrode sheet D, the negative electrode composite film F and the negative current collector G provided by the negative current collector unwinding assembly enter the negative electrode film trimming and shaping assembly to produce the negative electrode sheet H, and then the positive electrode sheet D, the negative electrode sheet H and the isolation film I provided by the isolation film unwinding device 8 enter the positive and negative electrode sheet flying shear stacking device 9 for shearing and stacking, and after completion, the positive electrode sheet D, the negative electrode sheet H and the isolation film I enter the composite lithium battery paper thermal composite device 10 for thermal composite, and finally produce the dry electrode composite lithium battery paper J.

[0064] The second embodiment of the present invention is a method for preparing a dry electrode composite lithium battery paper, which is implemented on the basis of the first embodiment, and specifically includes the following steps: S1, quantitative feeding of positive and negative electrode dry slurry; S2, preparation of positive and negative electrode films; S3, constant tension unwinding of positive and negative current collectors; S4, trimming and shaping of positive and negative electrode films; S5, constant tension unwinding of isolation membranes; S6, flying shearing, cross-cutting and stacking of positive and negative electrode sheets; S7, thermal compounding of composite lithium battery paper.

[0065] S1. Quantitative feeding of positive and negative electrode dry slurry: First, the positive electrode dry slurry and the negative electrode dry slurry are added to the positive electrode dry slurry distribution component 3 and the negative electrode dry slurry distribution component respectively through the feed port 32, and then the torque threshold is set for the servo motor screw feeder 33 in the positive electrode dry slurry distribution component 3 and the negative electrode dry slurry distribution component, so that the positive electrode dry slurry and the negative electrode dry slurry are pressed out from the distribution port 34 at a constant speed to complete the feeding of the positive electrode film forming component and the negative electrode film forming component; wherein the torque threshold of the servo motor screw feeder 33 can be set to 100Nm±3Nm according to actual conditions, combined with the positive primary forming The data of the film roller system 4 and the negative electrode primary film forming roller system are adjusted to control the micro tension of the positive electrode primary film A and the negative electrode primary film E at 0.5Nm±0.05Nm. In this embodiment, the torque threshold of the servo motor screw feeder 33 is set to 100Nm, and the micro tension of the positive electrode primary film A and the negative electrode primary film E is controlled at 0.5Nm, so that the feeding speeds of the positive electrode dry slurry and the negative electrode dry slurry are 1.01728kg / min and 0.40974kg / min respectively, ensuring that the compaction density of the positive electrode primary film A and the negative electrode primary film E are 2.1g / cm 3 and 1.5 g / cm 3 S2. Preparation of positive and negative electrode films: set the temperature thresholds and speed thresholds of the four pairs of heating rollers of the positive electrode primary film-forming roller system 4 and the negative electrode primary film-forming roller system, wherein the speed threshold adopts the baseline line speed, and combines the quantitative feeding of the positive and negative electrode dry slurry to realize the micro-tension rolling of the positive electrode primary film A and the negative electrode primary film E, and then adjust the spacing between the fixed heating roller and the movable heating roller in each pair of heating rollers, so that the spacing between each fixed heating roller and the movable heating roller in the positive electrode primary film-forming roller system 4 is 0.68mm, and the spacing between each fixed heating roller and the movable heating roller in the negative electrode primary film-forming roller system is 0.24mm, to ensure that the thickness of the positive electrode primary film A and the negative electrode primary film E meets the set value.

[0066] A temperature threshold of the secondary electrode film composite roller system is set and the temperatures of the two pairs of heating rollers are heated to the threshold value, the rotation speed of the two pairs of heating rollers of the secondary electrode film composite roller system is set as the reference line speed, and then the gap between the fixed heating roller and the movable heating roller in each pair of heating rollers in the secondary electrode film composite roller system is adjusted so that in the positive electrode secondary film forming roller system 5, the spacing between the fixed heating roller and the movable heating roller is 1.35 mm, and in the negative electrode secondary film forming roller system, the spacing between the fixed heating roller and the movable heating roller is 0.47 mm. The positive electrode primary film A and the negative electrode primary film E respectively enter the two pairs of heating rollers of the secondary electrode film composite roller system and are thermally composited at the reference line speed to produce a positive electrode composite film B and a negative electrode composite film F; wherein the temperature threshold of each heating roller in the positive and negative electrode primary film forming roller systems and the positive and negative electrode secondary film forming roller systems can be 230°C±5°C. In this embodiment, 230°C is selected as the temperature threshold of each heating roller, and the reference line speed is set to 5m / min.

[0067] S3. Constant tension unwinding of positive and negative current collectors: Wind the positive current collector and the negative current collector on the corresponding current collector guide rollers and the current collector tension sensor 65 respectively, and set the tension threshold of the current collector air expansion shaft 61. The current collector tension sensor 65 controls the current collector air expansion shaft 61 to perform constant tension unwinding, wherein the tension threshold of the current collector air expansion shaft 61 can be 10Nm±1Nm. In this embodiment, 10Nm is selected as the tension threshold of the current collector air expansion shaft 61.

[0068] S4, trimming and shaping of positive and negative electrode films: the rotation speed of the heated back roller 73 is set to the reference line speed, the positive electrode composite film B and the negative electrode composite film F enter a heated back roller 73 respectively to be compounded with the corresponding positive current collector C and negative current collector G, and at the same time, the gap between the blade 72 and the heated back roller 73 is adjusted so that the gap between the blade 72 and the heated back roller 73 in the positive electrode film trimming shaping assembly 7 is 0.012 mm, and the gap between the blade 72 and the heated back roller 73 in the negative electrode film trimming shaping assembly is 0.008 mm, so as to cut off the burrs of the positive electrode composite film B and the negative electrode composite film F, so that the current collectors, the positive electrode composite film B and the negative electrode composite film F passing through the heated back roller 73 are compounded and shaped into regular positive electrode sheets D and negative electrode sheets H; S5. Constant tension unwinding of the isolation film: wind the isolation film I around the corresponding isolation film guide roller and the isolation film tension sensor 84, and set the tension threshold of the isolation film air expansion shaft 81. The isolation film tension sensor 84 controls the isolation film air expansion shaft 81 to perform constant tension unwinding. The tension threshold of the isolation film air expansion shaft 81 can be 5Nm±1Nm. In the present embodiment, the tension threshold of the isolation film air expansion shaft 81 is set to 5Nm.

[0069] S6. Flying shears and cross-cutting and stacking of positive and negative electrode sheets: set the rotation speed thresholds of the positive electrode sheet clamping roller 91, the positive electrode sheet feeding and positioning roller 97, the negative electrode sheet clamping roller 92, and the negative electrode sheet feeding and positioning roller 96 as the reference line speed, and adjust the movement frequency of the first cylinder and the second cylinder to 6.72s / time to ensure that the positive electrode sheet flying shear 99 and the negative electrode sheet can cut the positive electrode sheet D and the negative electrode sheet H to a fixed length of 560mm.

[0070] The positive electrode sheet D is fed into the positive and negative electrode sheet flying shear stacking device 9 through the positive electrode sheet clamping roller 91, and the negative electrode sheet H is fed into the positive and negative electrode sheet flying shear stacking device 9 through the negative electrode sheet clamping roller 92. After entering the positive and negative electrode sheet flying shear stacking device 9, the positive electrode sheet D and the negative electrode sheet H are respectively cut by the positive electrode sheet flying shear 99 and the negative electrode sheet flying shear 98 on the positive electrode sheet anvil 95 and the negative electrode sheet anvil 94, and then sent to the discharge end by the positive electrode sheet feeding positioning roller 97 and the negative electrode sheet feeding positioning roller 96. The isolation membrane I enters the isolation membrane channel 910 through the isolation membrane guide roller and is sent to the discharge end.

[0071] S7. Thermal compounding of composite lithium battery paper: The positive electrode sheet D, negative electrode sheet H and isolation film I outputted from the positive and negative electrode sheet flying shear stacking device 9 are inputted into the thermal compounding device 10 of composite lithium battery paper, and the spacing between the fixed heating roller 104 of composite lithium battery paper and the movable heating roller 102 of composite lithium battery paper is adjusted, and then the composite lithium battery paper is thermally compounded by the composite lithium battery paper heating roller and steel belt in the thermal compounding device 10, and finally the composite lithium battery paper is output; wherein the rotation speed of the composite lithium battery paper heating roller is set as the reference line speed, and the spacing between the fixed heating roller 104 of composite lithium battery paper and the movable heating roller 102 of composite lithium battery paper can be set as 2.181mm±0.002mm according to the actual situation. In the present embodiment, the spacing between the fixed heating roller 104 of composite lithium battery paper and the movable heating roller 102 of composite lithium battery paper is set as 2.181mm.

[0072] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation device for dry electrode composite lithium battery paper, characterized in that: It includes a first supporting wall plate and a second supporting wall plate which are arranged relatively on a base, a positive and negative electrode sheet manufacturing device which is assembled between the first supporting wall plate and the second supporting wall plate, a separator unwinding device, a positive and negative electrode sheet flying shear stacking device and a composite lithium battery paper thermal composite device; The positive and negative electrode sheet manufacturing device comprises a positive electrode sheet manufacturing unit and a negative electrode sheet manufacturing unit, wherein the positive electrode sheet output end of the positive electrode sheet manufacturing unit is connected to the positive electrode sheet input end of the positive and negative electrode sheet flying shear stacking device, and the negative electrode sheet output end of the negative electrode sheet manufacturing unit is connected to the negative electrode sheet input end of the positive and negative electrode sheet flying shear stacking device; The isolating film output end of the isolating film unwinding device is connected to the isolating film input end of the positive and negative electrode sheet flying shear stacking device; The output end of the positive and negative electrode sheet flying shear stacking device is connected to the input end of the composite lithium battery paper thermal composite device.

2. The preparation device of a dry electrode composite lithium battery paper according to claim 1, characterized in that: The positive electrode sheet manufacturing unit includes a positive electrode dry slurry distribution assembly, a positive electrode film forming assembly whose feed end is connected to the discharge end of the positive electrode dry slurry distribution assembly, a positive current collector unwinding device for inputting a positive current collector, and a positive electrode film trimming and shaping assembly whose input end is connected to the output end of the positive electrode film forming assembly and the output end of the positive current collector unwinding device; The structure of the negative electrode sheet production unit is consistent with that of the positive electrode sheet production unit, including a negative electrode dry slurry cloth assembly, a negative electrode film forming assembly, a negative current collector unwinding assembly and a negative electrode film trimming and shaping assembly.

3. The preparation device of a dry electrode composite lithium battery paper according to claim 2, characterized in that: The positive electrode film forming assembly includes at least one pair of heated rollers rotating inwardly relative to each other.

4. The preparation device of a dry electrode composite lithium battery paper according to claim 3, characterized in that: There are two positive electrode dry pulp cloth assemblies and two negative electrode dry pulp cloth assemblies; The positive electrode dry slurry distribution assembly includes a cylinder fixed to a supporting wall panel by a fixing flange, a feed port opened on the side of the cylinder, a servo motor screw feeder fixed at the top of the cylinder and with the power output end vertically downward through the top wall of the cylinder and located inside the cylinder, and a distribution port fixed at the bottom of the cylinder.

5. The preparation device of a dry electrode composite lithium battery paper according to claim 4, characterized in that: The positive electrode film forming assembly includes a positive electrode primary film forming roller system and a positive electrode secondary film forming roller system, wherein the positive electrode primary film forming roller system includes two pairs of heating rollers, and the positive electrode secondary film forming roller system includes a pair of heating rollers, and the extrusion position of each pair of heating rollers in the positive electrode primary film forming roller system is respectively connected with the feeding ports of the two positive electrode dry slurry feeding assemblies; Each pair of heating rollers includes a fixed heating roller and a movable heating roller, and the movable heating roller can move in the horizontal radial direction. The input end of the positive electrode secondary film-forming roller system is connected with the two output ends of the positive electrode primary film-forming roller system, and the input end of the positive electrode secondary film-forming roller system is located in the middle position of the two output ends of the positive electrode primary film-forming roller system.

6. A preparation device for dry electrode composite lithium battery paper according to any one of claims 2 to 5, characterized in that: The positive current collector unwinding device includes a current collector inflation shaft for installing the current collector roll, a current collector tension sensor for testing the current collector tension, and a current collector guide roller for changing the movement direction of the current collector so that the current collector is located at the sensor after bypassing the sensor.

7. The preparation device of a dry electrode composite lithium battery paper according to claim 6, characterized in that: The positive electrode film trimming and shaping assembly comprises a knife frame, a blade fixed on the movable end of the knife frame and a heating back roller for heating and compounding the materials output by the positive electrode secondary film forming roller system and the positive current collector unwinding device.

8. The preparation device of a dry electrode composite lithium battery paper according to claim 7, characterized in that: The isolation film unwinding device includes an isolation film air inflation shaft for installing the isolation film roll, an isolation film tension sensor for detecting the isolation film tension, and isolation film guide rollers for changing the movement direction of the isolation film so that the isolation film is located on both sides of the sensor after bypassing the sensor.

9. A preparation device for dry electrode composite lithium battery paper according to any one of claims 1-5, 7-8, characterized in that: The positive and negative electrode sheet flying shear stacking device includes a positive electrode sheet clamping roller for conveying positive electrode sheets, a negative electrode sheet clamping roller for conveying negative electrode sheets, a positive electrode sheet anvil for guiding the positive electrode sheets, a negative electrode sheet anvil for guiding the negative electrode sheets, an isolation membrane channel arranged between the positive electrode sheet anvil and the negative electrode sheet anvil for the isolation membrane to pass through, an isolation membrane guiding roller for introducing the isolation membrane into the isolation membrane channel, a positive electrode sheet feeding positioning roller located on the side of the positive electrode sheet anvil away from the isolation membrane channel for positioning and conveying the positive electrode sheet, a negative electrode sheet feeding positioning roller located on the side of the negative electrode sheet anvil away from the isolation membrane channel for positioning and conveying the negative electrode sheet, a positive electrode sheet flying shear located on the side of the positive electrode sheet anvil away from the isolation membrane channel, and a negative electrode sheet flying shear located on the side of the negative electrode sheet anvil away from the isolation membrane channel.

10. The preparation device of a dry electrode composite lithium battery paper according to claim 9, characterized in that: The positive electrode sheet flying shear comprises a first cylinder whose power output end is perpendicular to the positive electrode sheet anvil and a first cutter head fixed at the power output end of the first cylinder. The negative electrode sheet flying shear comprises a second cylinder whose power output end is perpendicular to the negative electrode sheet anvil and a second cutter head fixed at the power output end of the second cylinder.

11. A preparation device for dry electrode composite lithium battery paper according to any one of claims 5, 7-8 and 10, characterized in that: The composite lithium battery paper thermal composite device comprises a relatively arranged movable thermal composite unit and a fixed thermal composite unit, wherein the movable thermal composite unit comprises a feed guide roller, a composite lithium battery paper movable heating roller, a discharge guide roller, and a steel belt arranged around the feed guide roller, the composite lithium battery paper movable heating roller and the discharge guide roller in sequence on the same tangent line; The fixed thermal composite unit includes a feed guide roller, a composite lithium battery paper fixed heating roller, a discharge guide roller, and a steel belt arranged in sequence on the same tangent line around the feed guide roller, the composite lithium battery paper fixed heating roller and the discharge guide roller.

12. The preparation device of dry electrode composite lithium battery paper according to claim 11, characterized in that: The fixed heating roller, movable heating roller, composite lithium battery paper fixed heating roller and composite lithium battery paper movable heating roller have the same structure, and all include a journal bearing, a heating roller body sleeved on the journal bearing and a heating tube passing through the heating roller body.

13. A method for preparing a dry electrode composite lithium battery paper, characterized in that: The method is based on the preparation device of the dry electrode composite lithium battery paper according to claim 1, and specifically comprises the following steps: S1. Quantitative feeding of positive and negative electrode dry slurry: quantitatively feeding the positive electrode film forming assembly and the negative electrode film forming assembly respectively through the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly; S2. Preparation of positive and negative electrode films: the positive electrode dry slurry provided by the positive electrode dry slurry distribution assembly enters the positive electrode primary film-forming roller system to be made into a positive electrode primary film, and then the positive electrode primary film enters the positive electrode secondary film-forming roller system to be made into a positive electrode composite film; the negative electrode dry slurry provided by the negative electrode dry slurry distribution assembly enters the negative electrode primary film-forming roller system to be made into a negative electrode primary film, and then the negative electrode primary film enters the negative electrode secondary film-forming roller system to be made into a negative electrode composite film; S3, constant tension unwinding of positive and negative current collectors: constant tension unwinding of the positive current collector roll and the negative current collector roll is performed by a positive current collector unwinding device and a negative current collector unwinding device; S4, positive and negative electrode film trimming and shaping: the positive electrode composite film and the negative electrode composite film enter the positive electrode film trimming and shaping device and the negative electrode film trimming and shaping device to be compounded and trimmed with the positive current collector and the negative current collector, and the positive electrode sheet and the negative electrode sheet are output; S5, constant tension unwinding of the isolation film: the isolation film roll is unwound with constant tension by the isolation film unwinding device; S6, positive and negative electrode sheet flying shear cross-section stacking: After the positive electrode sheet, the negative electrode sheet and the separator enter the positive and negative electrode sheet flying shear stacking device, the positive electrode sheet and the negative electrode sheet are cut into fixed-length sections, and at the same time, the positive electrode sheet, the negative electrode sheet and the separator are transported to the discharge end of the positive and negative electrode sheet flying shear stacking device, and stacking is completed at the discharge end; S7. Thermal composite of composite lithium battery paper: The positive and negative electrode sheets and isolation membrane outputted from the positive and negative electrode sheet flying shear cross-cutting stacking device are inputted into the thermal composite device for composite lithium battery paper, and thermal composite is completed in the thermal composite device for composite lithium battery paper to produce the final dry electrode composite lithium battery paper.

14. The method for preparing a dry electrode composite lithium battery paper according to claim 13, characterized in that: In step S1, by setting the torque threshold of the servo motor screw feeder in the positive electrode dry slurry distribution assembly and the negative electrode dry slurry distribution assembly to 100Nm±3Nm, the positive electrode dry slurry and the negative electrode dry slurry are pressed out from the distribution port at a constant speed, thereby completing the feeding of the positive and negative electrode film forming assemblies.

15. The method for preparing a dry electrode composite lithium battery paper according to claim 14, characterized in that: The step S2 is divided into the following two steps: (1) Adjustment of heating roller values: The temperature threshold of each heating roller in the positive electrode film forming assembly and the negative electrode film forming assembly is set to 150°C to 280°C ± 5°C, and the speed threshold is set to the reference line speed, which is 4m / min-6.5m / min, so as to achieve a micro-tension rolling of 0.5Nm ± 0.05Nm for the positive electrode primary film and the negative electrode primary film; (2) Adjustment of the spacing between the heating rollers: In the positive electrode primary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.2 mm to 0.68 mm; in the negative electrode primary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.2 mm to 0.24 mm; in the positive electrode secondary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.2 mm to 1.35 mm; in the negative electrode secondary film-forming roller system, the spacing between each fixed heating roller and the movable heating roller is adjusted to 0.2 mm to 0.47 mm.

16. The method for preparing a dry electrode composite lithium battery paper according to claim 15, characterized in that: In the step S3, the tension threshold of the current collector inflation axis needs to be set to 10 Nm±1 Nm.

17. The method for preparing a dry electrode composite lithium battery paper according to claim 16, characterized in that: In step S4, the rotation speed of the heated back roller is set to the reference line speed, and the gap between the blade and the heated back roller is adjusted at the same time, wherein in the positive electrode film trimming and shaping assembly, the gap between the blade and the heated back roller is 0.012mm to 0.2mm, and in the negative electrode film trimming and shaping assembly, the gap between the blade and the heated back roller is 0.008mm to 0.2mm.

18. A method for preparing a dry electrode composite lithium battery paper according to any one of claims 13 to 17, characterized in that: In the step S5, the tension threshold of the isolation film inflation axis is set to 5Nm±1Nm.

19. The method for preparing a dry electrode composite lithium battery paper according to claim 18, characterized in that: In step S6, the rotation speed thresholds of the positive electrode sheet clamping roller, the positive electrode sheet feeding and positioning roller, the negative electrode sheet clamping roller, and the negative electrode sheet feeding and positioning roller are set as the reference line speed, and the frequencies of the first cylinder and the second cylinder are adjusted to ensure that the positive electrode sheet flying shear and the negative electrode sheet can cut the positive and negative electrode sheets to a fixed length.

20. The method for preparing a dry electrode composite lithium battery paper according to claim 19, characterized in that: In step S7, the spacing between the fixed heating roller of the composite lithium battery paper and the movable heating roller of the composite lithium battery paper needs to be adjusted to 2.181 mm ± 0.002 mm, and then the composite lithium battery paper is thermally composited by the composite lithium battery paper heating roller and the steel belt in the composite lithium battery paper thermal composite device to finally produce the composite lithium battery paper, wherein the rotation speed of the composite lithium battery paper heating roller is set as the baseline line speed.

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