Slurry Double-Sided Coating Device

Abstract

The present invention discloses a slurry double-sided coating device, which includes a first pole coating device and a second pole coating device; the first pole coating device includes a first feeding mechanism, and a first pole pair roller pressing device is arranged at the discharging end of the first feeding mechanism. On both sides of the first pole pair roller pressing device are a first feeding roller group and a second feeding roller group respectively; the second pole coating device includes a second feeding mechanism, and a second pole pair roller pressing device is arranged at the discharging end of the second feeding mechanism. One side of the second pole pair roller pressing device is a third feeding roller group, and the other side is connected to the discharging end of the first pole pair roller pressing device, so that the second pole coating device and the first pole coating device are arranged continuously. The present invention realizes double-sided coating, and can directly process it into an unpacked battery cell, simplifies the process, improves the production efficiency, can disperse and coat the slurry with a high solid content, solves the quality problems and cost problems of lithium batteries caused by low-viscosity coating, and is applicable to all slurries for double-sided coating.

Description

Technical Field

[0001] The present invention belongs to the field of lithium battery production, and relates to a coating device, specifically a slurry double-sided coating device. Background Art

[0002] Slurry coating is to make the positive or negative electrode material of a lithium battery into a slurry, evenly coat and adhere it to the current collector to form a lithium battery electrode sheet, which is an important process section in the production of lithium batteries. After the slurry coating is completed, the positive electrode sheet and the negative electrode sheet are subjected to conventional rolling and slitting, and then wound or laminated, and then made into a lithium battery through a series of processes such as packaging, drying, and liquid injection.

[0003] The existing coating devices perform single-sided coating on the positive electrode slurry or the negative electrode slurry. After the coating is completed, a lamination or winding step is required, that is, the positive electrode sheet and the negative electrode sheet are stacked to form a laminated structure before the subsequent processes can be carried out. Such a single-sided coating device can only coat one side at a time, and stacking is required after the coating is completed, resulting in cumbersome processes and low efficiency. Summary of the Invention

[0004] To solve the above-mentioned deficiencies in the prior art, the present invention aims to provide a slurry double-sided coating device to achieve the purpose of double-sided coating of the slurry.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A slurry double-sided coating device includes a first electrode coating device and a second electrode coating device;

[0006] The first electrode coating device includes a first feeding mechanism, and a first electrode pair roll pressing device is arranged at one end of the discharge port of the first feeding mechanism. On both sides of the first electrode pair roll pressing device are a first feeding roll group and a second feeding roll group respectively;

[0007] The second electrode coating device includes a second feeding mechanism, and a second electrode pair roll pressing device is arranged at one end of the discharge port of the second feeding mechanism. One side of the second electrode pair roll pressing device is a third feeding roll group, and the other side of the second electrode pair roll pressing device is connected to the discharge end of the first electrode pair roll pressing device, so that the second electrode coating device and the first electrode coating device are arranged continuously along the processing direction.

[0008] As a limitation to the present invention: The first feeding roll group includes a first unwinding mechanism and a first flattening mechanism connected in sequence; the second feeding roll group includes a second unwinding mechanism and a second flattening mechanism connected in sequence; the third feeding roll group includes a third unwinding mechanism and a third flattening mechanism connected in sequence.

[0009] As a definition of the present invention: both the first feeding mechanism and the second feeding mechanism include a feed hopper and a feeding device for conveying the slurry to the feed hopper, and a dispersing device for dispersing the slurry is arranged in the feed hopper.

[0010] As a further limitation of the present invention: the first feeding roller group further includes a first functional film unwinding mechanism and a first functional film winding mechanism. The first functional film unwinding mechanism unwinds the film to the first flattening mechanism, and the corresponding roller in the first pair of polar rollers presses the device to collect the material through the first functional film winding mechanism; the second feeding roller group further includes a second functional film unwinding mechanism and a second functional film winding mechanism. The second functional film unwinding mechanism unwinds the film to the second flattening mechanism, and the corresponding coating roller in the first pair of polar rollers presses the device to collect the material through the second functional film winding mechanism; the third feeding roller group further includes a third functional film unwinding mechanism and a third functional film winding mechanism. The third functional film unwinding mechanism unwinds the film to the third flattening mechanism, and the corresponding coating roller in the second pair of polar rollers presses the device to collect the material through the third functional film winding mechanism.

[0011] As a further limitation of the present invention: the dispersing device is arranged at the discharge end of the feeding device, and the dispersing device is any one of a rotary dispersing device, a vibration dispersing device, and an air flow dispersing device; the rotary dispersing device includes a dispersing wheel and a motor for driving the dispersing wheel, and the dispersing wheel is any one of a hair wheel, a thorn wheel, and a knife wheel; the vibration dispersing device includes a vibration source; the air flow dispersing device includes an air pipe and an air outlet connected to the air pipe, and the air flow direction of the air outlet is arranged at an angle with the discharge direction of the feeding device.

[0012] As a further limitation of the present invention: a rubber pasting mechanism and a buffer mechanism are sequentially arranged between the second unwinding mechanism and the second flattening mechanism.

[0013] As a further limitation of the present invention: an alignment device, a turning roller, a first pole drying device, a first pole thickness detection device, a buffer mechanism, and a rubber pasting mechanism are arranged between the first pair of polar rollers pressing the device and the second pair of polar rollers pressing the device.

[0014] As a further limitation of the present invention: the feed hopper is arranged perpendicular or parallel to the feeding direction of the corresponding pair of rollers pressing the device.

[0015] As a further limitation of the present invention: an alignment device, a turning roller, a composite film drying device, a thickness shaping device, a thickness detection device, and a tracking cutting device are arranged at the discharge end of the second pair of polar rollers pressing the device.

[0016] As a further limitation of the present invention: a vibration source for vibrating the feed hopper is provided on the feed hopper. When the feed hopper is arranged perpendicular to the feeding direction of the corresponding pair of roller pressing devices, the feed hopper is conical. When the feed hopper is arranged parallel to the feeding direction of the corresponding pair of roller pressing devices, the feed hopper includes a functional plate that forms an acute angle with the feeding layer of the corresponding pair of roller pressing devices. The functional plate gradually approaches the feeding layer along the feeding direction of the pair of roller pressing devices, forming an inclined surface. Baffles are also provided on both sides of the functional plate.

[0017] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present invention compared with the prior art are as follows:

[0018] (1) The present invention is provided with a first pole coating device and a second pole coating device that are continuous along the processing direction. The coating of the first pole is realized through the first feeding mechanism and the first pole pair of roller pressing devices, and the second pole slurry is coated on the back side of the first pole through the second feeding mechanism and the second pole pair of roller pressing devices, realizing double-sided coating of the slurry. The separator of the composite lithium battery paper produced by this device is in the middle. One side of the separator is the negative electrode material and the current collector, and the other side of the separator is the positive electrode material and the current collector. At this time, an unpacked battery core has been formed, eliminating the need for winding or stacking, simplifying the process, and improving production efficiency;

[0019] (2) The feeding mechanism in the present invention includes a feeding device and a dispersing device. The twin-screw conveyor in the feeding device can transport the slurry with a high solid content, and the rotating dispersing device, vibrating dispersing device, and gas dispersing device in the dispersing device can effectively disperse the slurry with a high solid content, enabling the lithium battery slurry to be coated in a state of high viscosity (paste-like) or even ultra-high viscosity (block-like), reducing the possibility of problems such as stratification of low-viscosity slurry, agglomeration of active substances and conductive agents, shortening the subsequent drying time, reducing energy consumption, and improving efficiency.

[0020] In summary, the present invention realizes double-sided coating, can directly process into an unpacked battery core, simplifies the process, improves production efficiency, can disperse and coat the slurry with a high solid content, solves the quality problems and cost problems of lithium batteries caused by low-viscosity coating, and is applicable to all slurries for double-sided coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0023] Figure 2 is a schematic structural diagram of the feeding mechanism in Embodiment 1 of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the feeding mechanism in Embodiment 2 of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the feeding mechanism in Embodiment 3 of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the feeding mechanism in Embodiment 4 of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the feeding mechanism in Embodiment 5 of the present invention.

[0028] In the figure: 1 - First feeding mechanism, 2 - First pair of roller pressing devices, 3 - Coating roller, 4 - Negative current collector, 5 - Separator, 6 - First unwinding mechanism, 7 - First flattening mechanism, 8 - Second unwinding mechanism, 9 - Second flattening mechanism, 10 - Glue pasting mechanism, 11 - Buffer mechanism, 12 - Negative film, 13 - Alignment device, 14 - First functional film unwinding mechanism, 15 - First functional film winding mechanism, 16 - PET film, 17 - Second functional film unwinding mechanism, 18 - Second functional film winding mechanism, 19 - Absorbent paper, 20 - Deflection roller, 21 - First pole drying device, 22 - First pole thickness detection device, 23 - Second feeding mechanism, 24 - Second pair of roller pressing devices, 25 - Third unwinding mechanism, 26 - Thickness shaping device, 27 - Third flattening mechanism, 28 - Positive current collector, 29 - Composite film, 30 - Third functional film unwinding mechanism, 31 - Third functional film winding mechanism, 32 - Composite film drying device, 33 - Second pole thickness detection device, 34 - Tracking cutting device, 36 - Feed hopper, 361 - Functional plate, 362 - Anti - splash plate, 37 - Cylinder body, 38 - Twin - screw conveyor, 39 - Cylinder body feed inlet, 40 - Cylinder body discharge head, 41 - Discharge port, 42 - Vibration source, 43 - Dispersing wheel, 44 - Air pipe, 45 - Air outlet, 46 - Blocking roller, 47 - Smoothing roller, 48 - Support roller. Detailed implementation manners

[0029] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the slurry double - sided coating device described here is a preferred embodiment, which is only used to illustrate and explain the present invention and does not constitute a limitation to the present invention.

[0030] The orientation terms or position relationships such as "upper", "lower", "left", "right" in the present invention are based on the orientation relationship of the accompanying drawings of the present invention specification. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the content protected by the present invention.

[0031] Embodiment 1 Slurry double - sided coating device

[0032] As shown in this embodiment Figure 1 , Figure 2 shown, it is a slurry double-sided coating device, including a first pole coating device and a second pole coating device. The first pole coating device and the second pole coating device are continuously arranged along the processing direction. In this embodiment, the first pole coating device is used to coat the negative electrode slurry, and the second pole coating device is used to coat the positive electrode slurry, so that the double-sided coating of the positive electrode slurry and the negative electrode slurry is realized in this embodiment. Of course, the first pole coating device can also be used to coat the negative electrode slurry, and the second pole coating device can also be used to coat the positive electrode slurry.

[0033] The first pole coating device includes a first feeding mechanism 1 for inputting negative electrode slurry into the device. One end of the discharge port of the first feeding mechanism 1 is provided with a first pole pair roller pressing device 2. On both sides of the first pole pair roller pressing device 2 are a first feeding roller group and a second feeding roller group respectively. The materials arranged on the first feeding roller group and the second feeding roller group can be selected according to production needs. In this embodiment, a negative electrode current collector 4 is arranged on the first feeding roller group, and a separator 5 is arranged on the second feeding roller group. The first feeding roller group includes a first unwinding mechanism 6 and a first flattening mechanism 7 connected in sequence. Therefore, the first unwinding mechanism 6 in this embodiment is a negative electrode current collector unwinding mechanism. The second feeding roller group includes a second unwinding mechanism 8 and a second flattening mechanism 9 connected in sequence. Therefore, the second unwinding mechanism 8 in this embodiment is a separator unwinding mechanism. Further, an adhesive pasting mechanism 10 and a buffer mechanism 11 are sequentially arranged between the separator unwinding mechanism and the second flattening mechanism 9.

[0034] As Figure 1 shown, the arrow direction in the figure is the material conveying direction. The negative electrode current collector 4 and the separator 5 are pulled out by the corresponding unwinding mechanisms, and after passing through the corresponding flattening mechanisms, they are respectively wound onto two coating rollers 3 of the first pole pair roller pressing device 2. The negative electrode slurry is applied to the negative electrode current collector 4 or the separator 5 or between the two through the first feeding mechanism 1, and after being rolled by the first pole pair roller pressing device 2, it is pressed tightly and compactly, completing the composite of the separator 5 and the negative electrode slurry, and forming a negative electrode film 12 with a sandwich structure having the negative electrode current collector 4 and the separator 5 on both sides of the negative electrode slurry. In order to correct the deviation during the composite process, an alignment device 13 is arranged at the discharge end of the first pole pair roller pressing device 2. After the negative electrode film 12 is discharged, through the alignment detection of the alignment device 13, the alignment degree of the negative electrode film 12 is adjusted in real time.

[0035] Furthermore, the first feeding roller group further includes a first functional film unwinding mechanism 14 and a first functional film winding mechanism 15. In this embodiment, the first functional film is a PET (polyethylene terephthalate) film 16. Correspondingly, the first functional film unwinding mechanism 14 is a PET film unwinding mechanism, and the first functional film winding mechanism 15 is a PET film winding mechanism. The PET film unwinding mechanism feeds the material to the first flattening mechanism 7, and the corresponding coating roller 3 in the first pair of roller pressing devices 2 winds up the material through the PET film winding mechanism. The setting of the PET film 16 can prevent the dry pulp from passing through the mesh holes of the mesh current collector and sticking to the corresponding coating roller 3. Therefore, when the negative current collector 4 is a non-porous foil, the first functional film unwinding mechanism 14 and the first functional film winding mechanism 15 can be not used.

[0036] Similarly, the second feeding roller group also includes a second functional film unwinding mechanism 17 and a second functional film winding mechanism 18. In this embodiment, the second functional film is absorbent paper 19. Correspondingly, the second functional film unwinding mechanism 17 is an absorbent paper unwinding mechanism, and the second functional film winding mechanism 18 is an absorbent paper winding mechanism. The absorbent paper unwinding mechanism feeds the material to the second flattening mechanism 9, and the corresponding coating roller 3 in the first pair of roller pressing devices 2 winds up the material through the absorbent paper winding mechanism. The setting of the absorbent paper 19 can absorb the excess solvent in the slurry to improve the baking efficiency.

[0037] After the negative electrode film 12 is discharged, through the alignment detection of the alignment device 13, the alignment degree of the negative electrode film 12 is adjusted in real time. After alignment, the negative electrode film 12 is turned by the turning roller 20 so that the side with the separator 5 faces upward for subsequent coating of the positive electrode slurry. The turned negative electrode film 12 is surface-dried by the first pole drying device 21, then the thickness is detected by the first pole thickness detection device 22, then the buffer mechanism 11 keeps the negative electrode film under a certain tension, and the surface is glued by the gluing mechanism 10. In this embodiment, a buffer mechanism 11 is provided before and after the process of the gluing mechanism 11. After the above processing is completed, the coating of the second pole, that is, the positive electrode, is prepared.

[0038] The second pole coating device includes a second feeding mechanism 23 for inputting the positive electrode slurry into the device. One end of the discharge port of the second feeding mechanism 23 is provided with a second pole pair roll pressing device 24. The other side of the second pole pair roll pressing device 24 is connected to the discharge end of the first pole pair roll pressing device 2. That is, the negative electrode film 12 after the above treatment serves as the feedstock for the second pole pair roll pressing device 24 and is covered on the coating roll 3 on one side of the second pole pair roll pressing device 24, enabling the second pole coating device and the first pole coating device to be continuously arranged along the processing direction. The other side of the second pole pair roll pressing device 24 is a third feeding roll group, and the third feeding roll group includes a third unwinding mechanism 25 and a third flattening mechanism 27 that are connected in sequence. The materials provided on the third feeding roll group can be selected according to production needs. In this embodiment, a positive electrode current collector 28 is provided on the third feeding roll group. Therefore, the third unwinding mechanism 25 in this embodiment is a positive electrode current collector unwinding mechanism.

[0039] As Figure 1 shown (the arrow direction in the figure is the material conveying direction), the positive electrode current collector 28 is pulled out by the positive electrode current collector unwinding mechanism, and after passing through the third flattening mechanism 27, it and the negative electrode film 12 are respectively wound onto the two coating rolls 3 of the second pole pair roll pressing device 24. Since after being turned by the turning roll 20, the separator side of the negative electrode film 12 faces upward, the positive electrode slurry is applied to the other side of the negative electrode current collector 4 of the separator 5 through the second feeding mechanism 23, and then is roll-pressed by the second pole pair roll pressing device 24 to be compacted, completing the lamination of the negative electrode film 12 and the positive electrode slurry, and forming a composite film 29 with a sandwich structure of "negative electrode current collector - negative electrode slurry - separator - positive electrode slurry - positive electrode current collector". To correct the deviation during the lamination process, an alignment device 13 is provided at the discharge end of the second pole pair roll pressing device 24. After the composite film 29 is discharged, through the alignment detection of the alignment device 13, the alignment degree of the composite film 29 is adjusted in real time.

[0040] Furthermore, the third feeding roll group further includes a third functional film unwinding mechanism 30 and a third functional film winding mechanism 31. In this embodiment, the third functional film is a PET film 16. Correspondingly, the third functional film unwinding mechanism 30 is a PET film unwinding mechanism, and the third functional film winding mechanism 31 is a PET film winding mechanism. The PET film unwinding mechanism 30 feeds the material to the third flattening mechanism 27 and winds it up by the PET film winding mechanism from the corresponding coating roll 3 in the second pole pair roll pressing device 24. The setting of the PET film can prevent the dry slurry from passing through the mesh holes of the mesh current collector and sticking to the corresponding coating roll 3. Therefore, when the positive electrode current collector 28 is a non-porous foil, the third functional film unwinding mechanism 30 and the third functional film winding mechanism 31 can be not used.

[0041] As Figure 1As shown (the arrow direction in the figure is the material conveying direction), after the composite film 29 is discharged, through the alignment detection of the alignment device 13, the alignment degree of the composite film 29 is adjusted in real time. After the aligned composite film 29 is turned by the turning roller 20, it then passes through the composite film drying device 32 to complete surface drying, through the thickness shaping device 26 to complete shaping, and through the second extreme thickness detection device 33 to complete thickness detection. In order to improve the accuracy of the composite film 29, the surface drying, thickness shaping, and thickness detection processes can be repeated once or multiple times. In this embodiment, after the composite film 29 is turned, it undergoes surface drying, thickness shaping, and thickness detection twice. After completing the above steps, through the tracking cutting device 34, the composite film is made into composite lithium-ion paper of different lengths for use, and at this time, an unpackaged battery cell has been formed.

[0042] In the coating device of this embodiment, the slurry is evenly coated by the roll rolling device. This method has relatively high requirements for the physical state of the slurry. For example, the slurry should have a low kinematic viscosity, good self-leveling property, good adhesion performance, etc. The slurry is mainly composed of the positive electrode material or negative electrode material, conductive agent, adhesive, solvent, etc. of the lithium battery. Therefore, in order to make the slurry meet the physical property requirements of the coating process, a large amount of solvent needs to be added to the slurry during the mixing and stirring process of the slurry to reduce the viscosity and achieve the purpose of adapting to the coating process. However, this low-viscosity slurry is prone to stratification, and the active substances and conductive agents are prone to agglomeration, increasing the internal resistance of the lithium battery. Moreover, all the solvents need to be baked out during the subsequent drying, which also brings a series of cost problems such as high energy consumption during drying and solvent recovery.

[0043] To solve the above problems, this embodiment improves the feeding mechanism so that the slurry double-sided coating device in this embodiment can perform coating of high-solid-content slurry. As Figure 2 shown, it is the internal structure schematic diagram of the first feeding mechanism 1 and the second feeding mechanism 23 (the arrow direction in the figure is the material movement direction and the device movement direction). Since the structures of the first feeding mechanism 1 and the second feeding mechanism 23 are the same, only the internal structure of one of the feeding mechanisms is described in the figure (hereinafter referred to as the feeding mechanism). It should be noted that in order to simplify the expression in this embodiment, the first feeding mechanism 1 and the second feeding mechanism 23 adopt the same structure. In actual applications, the first feeding mechanism 1 and the second feeding mechanism 23 can select any one of the structures in this embodiment or other embodiments according to needs. The same applies hereinafter.

[0044] The feeding mechanism includes a feed hopper 36 and a material conveying device for conveying the slurry to the feed hopper 36. The material conveying device includes a cylinder body 37, a material conveying screw device arranged in the cylinder body 37, and a motor for driving the material conveying screw device. In this embodiment, the material conveying screw device is a twin-screw conveyor 38. Of course, the material conveying screw device can also be a screw conveyor or other structures capable of conveying high-solid-content materials. A cylinder body feed inlet 39 and a cylinder body discharge head 40 are arranged on the cylinder body 37. The cylinder body discharge head 40 extends into the feed hopper 36 to supply material to the feed hopper 36. The feed hopper 36 is arranged perpendicular to the feeding direction of the corresponding pair-roller rolling device, that is, the feed hopper 36 in this embodiment is arranged perpendicular to the feeding layer of the corresponding pair-roller rolling device. The feed hopper 36 is of a conical structure, and the lower end of the conical structure is the discharge port 41 of the feeding mechanism. In this embodiment, the opening of the discharge port 41 faces the gap formed between the two coating rollers 3 of the corresponding pair-roller rolling device. Of course, the opening of the discharge port 41 can also face above any one of the coating rollers 3 of the corresponding pair-roller rolling device. In order to make the slurry more uniform, a structure with a screening function such as a mesh hole or a slotted hole can be arranged on the discharge port 41. Of course, the discharge port 41 can also be an open structure. Further, in order to make the slurry more uniform and dispersed, a vibration source 42 for vibrating the feed hopper is arranged on the feed hopper 36. The vibration source 42 can be any one of common vibration devices such as a pneumatic vibrator, an electric vibrating table, and a piezoelectric crystal vibrator head.

[0045] A dispersing device for dispersing the slurry is arranged in the feed hopper 36. The dispersing device in this embodiment is a rotary dispersing device. The rotary dispersing device includes a dispersing wheel 43 and a motor for driving the dispersing wheel. The dispersing wheel 43 is arranged facing the cylinder body discharge head 40. The dispersing wheel 43 can be any one of a hair wheel, a thorn wheel, and a knife wheel.

[0046] The high-solid-content slurry enters the cylinder body 37 from the cylinder body feed inlet 39, is conveyed to the cylinder body discharge head 40 by the twin-screw conveyor 38, and the high-solid slurry discharged from the cylinder body discharge head 40 is dispersed by the dispersing wheel 43, falls on the inner wall of the feed hopper 36, and finally flows out from the discharge port 41 into the corresponding pair-roller rolling device. The slurry flowing out from the discharge port 41 has a uniform texture and a high density consistency, and the formed composite lithium-ion battery paper has excellent performance.

[0047] When using this embodiment, the negative electrode slurry with high solid content is placed into the feeding device of the first feeding mechanism 1. After being conveyed by the feeding device, the slurry enters the feeding hopper 36. After being dispersed by the dispersing device, it falls onto the first pair of roller pressing devices 2. Through the first pair of roller pressing devices 2, the negative electrode slurry is combined with the negative electrode current collector 4 and the separator 5 to form the negative electrode film 12. After the negative electrode film 12 is aligned, turned, dried, thickness detected, buffered, and pasted, the positive electrode slurry is coated by the second feeding mechanism, and the composite film 29 is formed through the second pair of roller pressing devices 24. After the composite film 29 is aligned, turned, dried, thickness shaped, thickness detected, and tracked and cut, a composite lithium battery paper with a sandwich structure of "negative electrode current collector - negative electrode slurry - separator - positive electrode slurry - positive electrode current collector" is formed.

[0048] Embodiment 2 Slurry Double-Sided Coating Device

[0049] This embodiment is as follows Figure 3 As shown (the arrow direction in the figure is the material movement direction and the device movement direction), it is a slurry double-sided coating device. The structure of this embodiment is roughly the same as that of Embodiment 1, except for the structures of the first feeding mechanism 1 and the second feeding mechanism 23. In this embodiment, the first feeding mechanism 1 has the same structure as the second feeding mechanism 23. For the sake of simplicity of expression, only the internal structure of one of the feeding mechanisms will be described, and the first feeding mechanism 1 and the second feeding mechanism 23 are collectively referred to as the feeding mechanism, the same hereinafter.

[0050] The structures of the feeding device and the feeding hopper 36 of the feeding mechanism in this embodiment are the same as those in Embodiment 1, except that in this embodiment, the opening of the discharge port 41 faces above the right coating roller 3 of the corresponding pair of roller pressing devices, and the dispersing device in the feeding hopper 36 is a vibration dispersing device. The vibration dispersing device includes a vibration source 42, which is arranged at the discharge end of the feeding device. The vibration direction of the vibration source 42 is perpendicular to the discharge direction of the feeding device, so that the high solid content slurry output by the feeding device is evenly cut under the vibration of the vibration source 42, thereby achieving the dispersion effect. The vibration source 42 can be any one of common vibration devices such as a pneumatic vibrator, an electric vibrating table, and a piezoelectric crystal vibrator head.

[0051] The usage method of this embodiment is roughly the same as that of Embodiment 1, except that in this embodiment, the high solid content slurry is placed into the feeding device, and after being conveyed by the feeding device, it enters the feeding hopper 36 and falls onto the corresponding pair of roller pressing devices after being dispersed by the vibration dispersing device.

[0052] Embodiment 3 Slurry Double-Sided Coating Device

[0053] This embodiment is as follows Figure 4As shown (the arrow direction in the figure is the material movement direction and the device movement direction), it is a double-sided slurry coating device. The structure of this embodiment is roughly the same as that of Embodiment 1, except for the structure of the feeding mechanism.

[0054] The structure of the material conveying device and the feed hopper 36 of the feeding mechanism in this embodiment is the same as that of Embodiment 1. The difference is that in this embodiment, the opening of the discharge port 41 faces above the left coating roller 3 of the corresponding double-roll rolling device, and the dispersing device in the feed hopper 36 is an air flow dispersing device. The air flow dispersing device includes an air pipe 44. The upper end of the air pipe 44 is connected to a gas source (the gas source part is omitted in the figure for clearer expression). The lower end of the air pipe 44 is connected to an air outlet 45. The air flow direction of the air outlet 45 is set at an angle to the discharge direction of the material conveying device, so that the high-solid-content slurry output by the material conveying device can be evenly cut under the high-pressure gas of the air outlet 45, thus achieving the dispersion effect. Further, to make the cutting effect better, the air flow direction of the air outlet 45 is perpendicular to the discharge direction of the material conveying device in this embodiment.

[0055] The usage method of this embodiment is roughly the same as that of Embodiment 1. The difference is that the high-solid-content slurry in this embodiment is placed into the material conveying device, conveyed by the material conveying device, enters the feed hopper 36, and after being dispersed by the air flow dispersing device, it falls onto the first double-roll rolling device.

[0056] Embodiment 4 Double-sided Slurry Coating Device

[0057] In this embodiment, as Figure 5 shown (the arrow direction in the figure is the material movement direction and the device movement direction), it is a double-sided slurry coating device. The structure of this embodiment is roughly the same as that of Embodiment 1, except for the structure of the feeding mechanism.

[0058] The structure of the material conveying device of the feeding mechanism in this embodiment is the same as that of Embodiment 1. The difference lies in the structure and installation position of the feed hopper 36. In this embodiment, the feed hopper 36 is arranged parallel to the feeding direction of the corresponding double-roll rolling device. The feed hopper 36 is of a box structure, and the discharge port 41 of the feeding mechanism is on the right side of the box structure. In this embodiment, the opening of the discharge port 41 faces above the left coating roller 3 of the corresponding rolling device. A dispersing device for dispersing the slurry is arranged in the feed hopper 36. The structure of the dispersing device in this embodiment is the same as that in Embodiment 1, which is a rotary dispersing device. A blocking roller 46 for preventing the slurry from splashing upward after dispersion is also arranged in the feed hopper. The rotation of the blocking roller 46 is driven by a motor. To ensure the flatness of the slurry at the discharge port 41, a leveling roller 47 is also arranged at the discharge port 41, and the rotation of the leveling roller 47 is driven by a motor. To make the operation stable, a support roller 48 is arranged below the leveling roller 47 and the feed hopper 36 to provide support for the leveling roller 47 and the feed hopper 36.

[0059] The usage method of this embodiment is roughly the same as that of Embodiment 1. The difference is that the high-solid-content slurry of this embodiment is placed into the feeding device. After being conveyed by the feeding device, it enters the feed hopper 36. After being dispersed by the rotary dispersion device and blocked by the blocking roller 46, it falls onto the feeding layer of the corresponding pair-roller rolling device. After being leveled by the rotation of the leveling roller 47, it is input into the corresponding pair-roller rolling device.

[0060] Embodiment 5 Slurry Double-Sided Coating Device

[0061] As shown in this embodiment Figure 6 (the arrow direction in the figure is the material movement direction and the device movement direction), it is a slurry double-sided coating device. The structure of this embodiment is roughly the same as that of Embodiment 1. The difference lies in the structure of the feeding mechanism.

[0062] The structure of the feeding device of the feeding mechanism in this embodiment is the same as that of Embodiment 1. The difference lies in the structure and installation position of the feed hopper 36. In this embodiment, the feed hopper 36 is arranged parallel to the feeding direction of the corresponding pair-roller rolling device. A dispersion device for dispersing the slurry is arranged in the feed hopper. The structure of the dispersion device in this embodiment is the same as that in Embodiment 1, which is a rotary dispersion device.

[0063] The feed hopper 36 includes a functional plate 361 that forms an acute angle with the feeding layer of the corresponding pair-roller rolling device. The functional plate 361 gradually approaches the feeding layer along the feeding direction of the pair-roller rolling device, forming an inclined plane with a leveling function. The lower edge of the functional plate 361 has a certain distance from the feeding layer of the corresponding pair-roller rolling device. By controlling the size of this distance, the leveling thickness of the slurry is controlled. In order to make the leveling more uniform and enable the splashed slurry after dispersion to continue to be coated, a vibration source 42 is arranged on the functional plate 361, which can make the splashed slurry attached to the functional plate 361 vibrate and fall. The vibration source 42 can be any one of common vibration devices such as a pneumatic vibrator, an electric vibrating table, and a piezoelectric crystal vibrator. In addition, baffles are arranged on both sides of the functional plate 361, and the arrangement of the baffles can keep the width of the slurry consistent. Further, a splash-proof plate 362 is also arranged on the side of the functional plate 361 facing the feeding device, which can prevent the slurry from splashing towards the feeding device under the action of the dispersion device.

[0064] The usage method of this embodiment is roughly the same as that of Embodiment 1. The difference is that the high-solid-content slurry of this embodiment is placed into the feeding device. After being conveyed by the feeding device, it enters the feed hopper 36. After being dispersed by the rotary dispersion device, it falls onto the feeding layer of the corresponding pair-roller rolling device. After being leveled by the functional plate 361, it is input into the corresponding pair-roller rolling device.

Claims

1. A slurry double-sided coating device, characterized in that: it includes a first pole coating device and a second pole coating device; the first pole coating device includes a first feeding mechanism, and at one end of the discharge port of the first feeding mechanism, there is a first pole pair roll pressing device, and on both sides of the first pole pair roll pressing device are a first feeding roll group and a second feeding roll group respectively; the second pole coating device includes a second feeding mechanism, and at one end of the discharge port of the second feeding mechanism, there is a second pole pair roll pressing device. One side of the second pole pair roll pressing device is a third feeding roll group, and the other side of the second pole pair roll pressing device is connected to the discharge end of the first pole pair roll pressing device, so that the second pole coating device and the first pole coating device are arranged continuously along the processing direction; both the first feeding mechanism and the second feeding mechanism include a feeding hopper and a feeding device for conveying the slurry to the feeding hopper. Inside the feeding hopper, there is a dispersing device for dispersing the slurry. The dispersing device is arranged at the discharge end of the feeding device, and the structure of the dispersing device is any one of the following, a1. A rotary dispersing device, including a dispersing wheel and a motor for driving the dispersing wheel. The dispersing wheel is any one of a wool wheel, a thorn wheel, and a knife wheel. Inside the feeding hopper, there is also a blocking roller for preventing the slurry from splashing upward after being dispersed. The rotation of the blocking roller is driven by the motor. At the discharge port, there is also a smoothing roller, and the rotation of the smoothing roller is driven by the motor. Below the smoothing roller and the feeding hopper, there is a supporting roller to provide support for the smoothing roller and the feeding hopper; a2. A rotary dispersing device, including a dispersing wheel and a motor for driving the dispersing wheel. The dispersing wheel is any one of a wool wheel, a thorn wheel, and a knife wheel. The feeding hopper is arranged parallel to the feeding direction of the corresponding pair roll pressing device. The feeding hopper includes a functional plate that forms an acute angle with the feeding layer of the corresponding pair roll pressing device. The functional plate gradually approaches the feeding layer along the feeding direction of the pair roll pressing device, forming an inclined plane with a smoothing function. There is a distance between the lower edge of the functional plate and the feeding layer of the corresponding pair roll pressing device. By controlling the size of this distance, the smoothing thickness of the slurry is controlled. On both sides of the functional plate, there are also baffles, and on the side of the functional plate facing the feeding device, there is also a splash-proof plate; b. A vibration dispersing device, including a vibration source. The vibration source is arranged at the discharge end of the feeding device, and the vibration direction of the vibration source is perpendicular to the discharge direction of the feeding device, so that the high-solid-content slurry output by the feeding device is evenly cut under the vibration of the vibration source, thereby achieving the dispersing effect; c. An air flow dispersing device, including an air pipe and an air outlet connected to the air pipe. The air flow direction of the air outlet is perpendicular to the discharge direction of the feeding device, and it can make the high-solid-content slurry output by the feeding device be evenly cut under the gas of the air outlet, thereby achieving the dispersing effect.

2. The slurry double-sided coating device according to claim 1, characterized in that: the first feeding roll group includes a first unwinding mechanism and a first flattening mechanism connected in sequence; the second feeding roll group includes a second unwinding mechanism and a second flattening mechanism connected in sequence; the third feeding roll group includes a third unwinding mechanism and a third flattening mechanism connected in sequence.

3. The slurry double-sided coating device according to claim 2, characterized in that: The first feeding roller group further includes a first functional film unwinding mechanism and a first functional film winding mechanism. The first functional film unwinding mechanism feeds the material to the first flattening mechanism, and the corresponding roller in the first pair of roller pressing devices winds the material through the first functional film winding mechanism; the second feeding roller group further includes a second functional film unwinding mechanism and a second functional film winding mechanism. The second functional film unwinding mechanism feeds the material to the second flattening mechanism, and the corresponding coating roller in the first pair of roller pressing devices winds the material through the second functional film winding mechanism; the third feeding roller group further includes a third functional film unwinding mechanism and a third functional film winding mechanism. The third functional film unwinding mechanism feeds the material to the third flattening mechanism, and the corresponding coating roller in the second pair of roller pressing devices winds the material through the third functional film winding mechanism.

4. The slurry double-sided coating device according to claim 3, characterized in that: A glue sticking mechanism and a buffer mechanism are sequentially arranged between the second unwinding mechanism and the second flattening mechanism.

5. The slurry double-sided coating device according to claim 3, characterized in that: An alignment device, a turning roller, a first pole drying device, a first pole thickness detection device, a buffer mechanism, and a glue sticking mechanism are arranged between the first pair of roller pressing devices and the second pair of roller pressing devices.

6. The slurry double-sided coating device according to claim 5, characterized in that: An alignment device, a turning roller, a composite film drying device, a thickness shaping device, a thickness detection device, and a tracking cutting device are arranged at the discharge end of the second pair of roller pressing devices.

7. The slurry double-sided coating device according to claim 1, characterized in that: The feed hopper is arranged perpendicular or parallel to the feeding direction of the corresponding pair of roller pressing devices.

8. The slurry double-sided coating device according to claim 7, characterized in that: A vibration source for vibrating the feed hopper is arranged on the feed hopper. When the feed hopper is arranged perpendicular to the feeding direction of the corresponding pair of roller pressing devices, the feed hopper is conical.

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