CN114653547A - Coating method and device for high-viscosity slurry of secondary battery - Google Patents

Coating method and device for high-viscosity slurry of secondary battery Download PDF

Info

Publication number
CN114653547A
CN114653547A CN202210281114.2A CN202210281114A CN114653547A CN 114653547 A CN114653547 A CN 114653547A CN 202210281114 A CN202210281114 A CN 202210281114A CN 114653547 A CN114653547 A CN 114653547A
Authority
CN
China
Prior art keywords
coating
slurry
roller
gap
vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210281114.2A
Other languages
Chinese (zh)
Inventor
王俊勇
张聪聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boronelli Xingtai Battery Equipment Co ltd
Original Assignee
Boronelli Xingtai Battery Equipment Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boronelli Xingtai Battery Equipment Co ltd filed Critical Boronelli Xingtai Battery Equipment Co ltd
Priority to CN202210281114.2A priority Critical patent/CN114653547A/en
Publication of CN114653547A publication Critical patent/CN114653547A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/02—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to surfaces by single means not covered by groups B05C1/00 - B05C7/00, whether or not also using other means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0411—Methods of deposition of the material by extrusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a secondary battery high-viscosity slurry coating method and a device, wherein the coating method comprises the following steps: the coating substrate is coated through a slurry gap in a vacuum environment and a discharge port gap for controlling the thickness of the coating slurry in sequence to obtain a pole piece with uniform coating, and the discharge port gap is arranged by depending on a slurry cavity. The coating device comprises a coating back roll, a coating member is arranged on the coating back roll, a slit for coating the coating base material is formed by the coating member and the periphery of the coating back roll, the coating member comprises a vacuum cavity and a slurry cavity which are communicated through a slurry gap for coating the coating base material for the first time, and a coating base material guiding mechanism is arranged at one end of the vacuum cavity, which is far away from the slurry cavity; a slurry feeding port is formed in the slurry cavity, and a discharge port for secondary coating is formed between the shell at one end, away from the vacuum cavity, of the slurry cavity and the coating back roller. The device disclosed by the invention is simple in structure and convenient to operate, and can be used for effectively and uniformly coating the high-viscosity slurry.

Description

Coating method and device for high-viscosity slurry of secondary battery
Technical Field
The invention belongs to the technical field of secondary battery production, relates to a slurry coating method in secondary battery production, and particularly relates to a high-viscosity slurry coating method for a secondary battery. The invention also relates to a coating device for the high-viscosity slurry of the secondary battery.
Background
In the production process of the secondary battery, the coating process is a very important process, and the quality of the coating process directly influences the performance of the finally produced lithium battery pole piece. In the prior art, a coating process usually adopts an extrusion process or a transfer process, and slurry made of a secondary battery anode and cathode material (the slurry mainly comprises the secondary battery anode and cathode material, a conductive agent, a binder, a solvent and the like) is uniformly coated on a current collector to form a secondary battery pole piece with a flat and smooth surface, uniform dressing, good adhesion and no air bubbles. This is because if a high viscosity slurry is chosen, two problems arise: firstly, the adhesive force between the slurry and the base material is large, so that the slurry cannot automatically level (the slurry cannot form a flat and smooth surface under the action of gravity and surface tension); secondly, in the high-speed coating process, the slurry has poor fluidity, the slurry cannot rapidly drive the gas on the surface of the base material, and the base material can bring the gas adsorbed on the surface of the base material into the slurry, so that the defects of pinholes, foil leakage, bubbles and the like exist on the surface of the secondary battery pole piece.
In order to avoid the coating defect of the high-viscosity slurry, the prior art generally adopts a method of adding a large amount of diluting solvent into the slurry in a stirring process to reduce the viscosity of the slurry, but the above method can reduce the viscosity of the slurry, but negative effects such as slurry layering, active substance and conductive agent agglomeration, secondary battery internal resistance increase and the like are generated in the later coating process, the content of the diluting solvent in the low-viscosity slurry is high, the diluting solvent needs to be completely baked after the coating is completed, the energy consumption is high during drying, the production efficiency is influenced, and the resource waste is caused.
Disclosure of Invention
The invention aims to provide a coating method of high-viscosity slurry for a secondary battery, which is simple to operate, high in manufacturing efficiency and high in production quality.
Another object of the present invention is to provide a coating apparatus, which utilizes vacuum low pressure and multi-pass coating to solve the problems of uneven surface, foil leakage, and bubbles of the secondary battery pole piece during coating with high viscosity slurry in the prior art, so that the coating with high viscosity slurry is more uniform, flat and smooth.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a coating method of high-viscosity slurry for secondary batteries comprises the following steps: the coating substrate is coated through a slurry gap in a vacuum environment and a discharge port gap for controlling the thickness of the coating slurry in sequence to obtain a pole piece uniformly coated, and the discharge port gap is arranged by depending on a slurry cavity.
As the limitation of the method: after the coating substrate is coated through the slurry gap and before the coating is carried out through the discharge port gap, the coating substrate is further coated through the guide plate gap.
As a further limitation of the method, the size of the gap of the guide plate and the gap of the discharge hole can be adjusted under the driving of an external driving mechanism.
As a further limitation of the method, the gap of the guide plate is 0.2-15 mm, and the gap of the discharge hole is 0.01-5 mm.
As a further limitation of the method, a transverse whitening treatment step is arranged after the coating substrate is coated through the gaps of the guide plates or the gaps of the discharge holes; the coating substrate is simultaneously provided with a longitudinal whitening treatment step in the process of coating from the slurry gap to the discharge hole gap.
The invention also provides a coating device for the coating method, which comprises a coating back roller, wherein a coating member is arranged on the coating back roller, the coating member is of a cavity structure, and a slit for coating the coating base material is formed on the periphery of the coating member and the periphery of the coating back roller; the slurry cavity is provided with a slurry feeding port for injecting slurry, and a discharge port for recoating the coating base material and guiding out the coating base material is formed between the shell at one end, far away from the vacuum cavity, of the slurry cavity and the coating back roller.
As a limitation to the above-described coating apparatus: the slurry cavity is also internally provided with a guide plate which moves along the movement direction of the coating base material under the driving of an external driving mechanism, and a guide plate gap for secondary coating of the coating base material is formed between the guide plate and the periphery of the coating back roller.
As another limitation to the above-mentioned coating apparatus: the slurry cavity 1 is internally provided with a slurry baffle plate parallel to the motion direction of the coating substrate, the length of the slurry baffle plate extends to a discharge port from a slurry gap, and the slurry baffle plate is far away from or close to the coating back roll under the drive of an external drive mechanism.
As a third limitation to the above-described coating apparatus: it still includes the discharge gate shrouding that sets up along coating substrate width direction, the discharge gate shrouding is located between discharge gate and the guide plate or the rear of discharge gate, and keeps away from or is close to the coating back-up roll under external drive mechanism's drive.
As a fourth limitation on the above coating apparatus, the coating substrate introducing mechanism is one of the following structures:
Figure 270031DEST_PATH_IMAGE002
) The coating area base material passes through the vacuum sealing constant-speed roller and the vacuum sealing roller;
Figure DEST_PATH_IMAGE003
) Comprises a vacuum sealing constant speed roller arranged on a vacuum cavity shell, and a vacuum sealing constant speed rollerThe coating back roller is tangent, a press roller tangent with the coating back roller is arranged in the vacuum cavity, and the coating base material sequentially passes through the space between the vacuum sealing constant-speed roller and the coating back roller and the space between the press roller and the coating back roller;
Figure 983909DEST_PATH_IMAGE004
) The coating device comprises a vacuum sealing constant-speed roller arranged on a vacuum cavity shell, wherein the vacuum sealing constant-speed roller is tangent to a coating back roller, a roller and a press roller tangent to the coating back roller are arranged in a vacuum cavity, and a coating substrate sequentially passes through the space between the vacuum sealing constant-speed roller and the coating back roller, the press roller and the coating back roller;
Figure DEST_PATH_IMAGE005
) The coating device comprises a sealing component which is arranged on a vacuum cavity shell and is pressed against the periphery of a coating back roller, and a coating base material passes through the sealing component and the coating back roller.
As a fifth limitation to the above-described coating apparatus: the vacuum pumping ports comprise at least 2 vacuum chambers arranged at intervals along the moving direction of the coated substrate; the leading-in mechanism comprises a leading-in component arranged between 2 adjacent vacuumizing ports, the leading-in component is arranged on the vacuum cavity shell and is pressed against the periphery of the coating back roll, and the coating base material passes through the space between the leading-in component and the coating back roll.
As a further limitation to the limitation of the coating device for the high-viscosity slurry of the secondary battery, the gap between the guide plate and the coating back roll is 0.2-15 mm, the gap between the discharge port and the coating back roll is 0.01-5 mm, the distance between the discharge port sealing plate and the discharge port is 0.1-15 mm, and the distance between the guide plate and the discharge port is 0.01-15 mm.
As a further limitation to the above-mentioned secondary battery high viscosity paste coating apparatus, an angle between the discharge port and the coating back roll is 0 ° to 60 °.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that: (1) when the method of the invention is used for coating the slurry on the coating base material, the slurry gap in the vacuum environment is firstly introduced, so that the thin gas on the surface of the base material can be driven when the slurry with high viscosity is used for coating the base material, and the problems of pinholes, foil leakage, bubbles and the like on the surface of the pole piece, which are generated when the base material absorbs a large amount of gas on the surface of the base material and enters the slurry in the coating process in the prior art, are effectively avoided. Furthermore, a slurry gap and a discharge port gap are sequentially arranged in the slurry coating process, and the high-viscosity slurry can be coated smoothly and uniformly after a multi-pass coating procedure.
(2) The method of the invention also sets the gap of the guide plate to carry out two-pass coating in the coating process of the coating base material, and the coating of the high-viscosity slurry and the coating base material is smoother and more uniform by matching with one-pass coating of the slurry gap and three-pass coating of the gap of the discharge port.
(3) The coating device is additionally provided with a vacuum cavity structure based on slit coating in the prior art, the vacuum cavity structure is provided with a vacuumizing port for extracting gas, a vacuum environment can be formed only by continuously exhausting gas from the vacuumizing port during use, and the coating device is simple and convenient to operate.
(3) The device of the invention is provided with a guide plate structure which can be driven in the slurry cavity, and the transverse coating thickness of the slurry is adjusted by controlling the motion of the guide plate structure.
(4) The slurry baffle plate parallel to the movement direction of the coating base material is arranged in the slurry cavity of the device, the slurry baffle plate is controlled to be close to the coating back roller through an external driving mechanism, and the slurry baffle plate is always pressed on the coating back roller in the coating process, so that the longitudinal white leaving treatment of the coating base material is realized; the slurry cavity is internally provided with a discharge port sealing plate arranged along the width direction of the coating base material between the discharge port and the guide plate, and the discharge port sealing plate is controlled by an external driving mechanism to be far away from or close to the coating back roll to realize the transverse whitening treatment of the base material.
In conclusion, the coating device for the high-viscosity slurry of the secondary battery is simple in structure and convenient to operate, and can improve the production efficiency and reduce the energy consumption. The method can ensure that the high-viscosity slurry is more flat and smooth in coating, uniform in dressing, good in adhesive force and free of bubbles, and improves the coating quality of the secondary battery in the coating process link. When the device disclosed by the invention is used for coating the high-viscosity slurry, the energy consumption of subsequent drying can be effectively reduced by 5% -20%, and the method disclosed by the invention is suitable for slurry coating of any coating base material.
Drawings
The invention is described in further detail below with reference to the figures and the embodiments.
FIG. 1 is a front view of embodiment 1 of the present invention;
FIG. 2 is a top view of example 1 of the present invention;
FIG. 3 is a detailed view of the components in the slurry chamber 1 according to example 1 of the present invention;
FIG. 4 is a second construction view of the introducing mechanism in embodiment 1 of the present invention;
FIG. 5 is a schematic view showing a third structure of the introducing mechanism in embodiment 1 of the present invention;
FIG. 6 is a schematic view showing a fourth structure of the introducing mechanism in example 1 of the present invention;
FIG. 7 is a front view of embodiment 2 of the present invention;
FIG. 8 is a detailed view of the respective parts in the vacuum chamber 2 in example 2 of the present invention.
In the figure: 1. a slurry chamber; 2. a vacuum chamber; 3. coating a back roll; 4. passing through a roller; 5. coating a substrate; 6. pole pieces; 11. a discharge port; 12. a discharge hole closing plate; 13. a slurry chamber housing; 14. a baffle; 15. a slurry inlet; 16. a baffle driver; 17. a slurry baffle; 18. coating a board; 21. a vacuum pumping port; 22. a vacuum chamber housing; 23. vacuum sealing a constant speed roller; 24. a vacuum seal roller; 25. a compression roller; 27. a sealing member; 61. A longitudinal margin region; 62. a lateral margin.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1 coating apparatus for high viscosity slurry for secondary battery
This example provides a secondary battery high-viscosity slurry coating apparatus, as shown in fig. 1 and 2, which includes a coating back roll 3, and a coating member is provided on the coating back roll 3. The coating member of this embodiment has a cavity structure, and the coating member and the outer periphery of the coating backing roll 3 form a slit for coating the coating substrate. The coating member comprises a vacuum chamber 2 and a slurry chamber 1 which are communicated by a slurry gap, and the slurry gap in the embodiment can perform first coating on a coating substrate 5.
In order to achieve the vacuum effect of the vacuum chamber 2 in this embodiment, a vacuum-pumping port 21 for pumping gas is provided on the vacuum chamber 2. In order to enable the coated substrate to enter the vacuum chamber 2, a coated substrate introducing mechanism is arranged at one end of the vacuum chamber 2 far away from the slurry chamber 1, as shown in fig. 1, the coated substrate introducing mechanism is a vacuum sealing constant speed roller 23 and a vacuum sealing roller 24 which are tangent in the embodiment, and the coated substrate 5 passes through between the vacuum sealing constant speed roller 23 and the vacuum sealing roller 24; or as shown in fig. 4, the coating substrate introducing mechanism may also be a vacuum sealing constant speed roller 23 arranged on the casing of the vacuum chamber 2, the vacuum sealing constant speed roller 23 is tangent to the coating back roller 3, a press roller 25 tangent to the coating back roller 3 is arranged in the vacuum chamber 2, and the coating substrate 5 passes through between the vacuum sealing constant speed roller 23 and the coating back roller 3 and between the press roller 25 and the coating back roller 3 in sequence; or as shown in fig. 5, the coating substrate introducing mechanism may also be a vacuum sealing constant speed roller 23 arranged on the casing of the vacuum chamber 2, the vacuum sealing constant speed roller 23 is tangent to the coating back roller 3, a roller 4 and a press roller 25 tangent to the coating back roller 3 are arranged in the vacuum chamber 2, and the coating substrate 5 passes through the space between the vacuum sealing constant speed roller 23 and the coating back roller 3, the roller 4, the press roller 25 and the coating back roller 3 in sequence; alternatively, as shown in fig. 6, the coating substrate introducing mechanism may be a sealing member 27 disposed on the casing of the vacuum chamber 2 and pressed against the outer periphery of the coating back roller 3, and at this time, the sealing member 27 and the outer periphery of the coating back roller 3 form a slit through which the coating substrate 5 passes, wherein the sealing member is a flexible member such as a rubber strip, a silicone strip, or a fluororubber strip, and the coating substrate 5 passes between the sealing member 27 and the coating back roller 3.
In this embodiment, in order to realize that the coated substrate 5 can be carried into the slurry chamber 1 from the vacuum chamber 2, one side of the casing of the slurry chamber 1, which is close to the vacuum chamber 2, is the coating plate 18 (the coating plate 18 is a part of the casing of the slurry chamber 1), a slurry gap E is formed between the coating plate 18 and the periphery of the coating back roll 3, and this slurry gap E not only enables the coated substrate 5 to enter the slurry chamber 1 from the vacuum chamber 2, but also enables the coated substrate 5 to be coated once. The method is characterized in that one side of a slurry gap E formed between a coating plate 18 and a coating back roller 3 is a vacuum cavity 2, the other side of the slurry gap E is a slurry cavity 1, the vacuum cavity 2 is in a low-pressure vacuum environment, the pressure difference exists between the slurry cavity 1 and the vacuum cavity 2, slurry in the slurry cavity 1 flows from the slurry cavity 1 to the vacuum cavity 2 under the action of the pressure difference and flows into the area of the slurry gap E, the coating substrate 5 is firstly contacted with the slurry gap E in the process that the coating substrate 5 moves from the vacuum cavity 2 to the slurry cavity 1, the slurry and the coating substrate 5 are both in the low-pressure vacuum environment, and when the high-viscosity paste slurry is coated on the coating substrate 5, the thin gas on the surface of the substrate can be effectively driven, so that the problems that the coating surface of the existing secondary battery coating device has pinholes and the problems that the high-viscosity paste slurry cannot timely drive the gas on the surface of the coating substrate 5 are solved, Leakage of foil, air bubbles and the like.
Slurry cavity 1 is provided with guide plate 14, and this guide plate 14 can be followed 5 direction of motion movements of coating substrate under the drive of guide plate driver 16, and guide plate 14 and coating back-up roll 3's periphery forms guide plate gap D, and coating substrate 5 through slurry gap E one time coating can be under the drive of coating back-up roll 3, through guide plate gap D, and then realizes the two-pass coating to coating substrate 5.
The size of guide plate gap D is controlled through 16 drive guide plate 14's removal of guide plate driver to this embodiment, and wherein guide plate gap D's value range is 0.2mm ~ 15mm, and the substrate takes thick liquids to remove along substrate direction of motion, through guide plate gap D.
In this embodiment, a discharge port 11 is formed at one end of the slurry chamber 1 far from the vacuum chamber 2, the discharge port 11 and the periphery of the coating back roll 3 also form a slit, so that the discharge port 11 not only enables the coating substrate to be led out of the slurry chamber 1, but also can carry out three-time coating on the coating substrate 5, and the redundant slurry flows back into the slurry return chamber 1 under pressure by the flow guide plate 14.
To complete the present embodiment, a slurry baffle 17 is provided in the slurry chamber 1 parallel to the direction of movement of the coated substrate 5, and the slurry baffle 17 is driven by a slurry baffle driver to move away from or close to the coating backing roll 3. The baffle 17 of the present embodiment is made of a soft material, and may be a side baffle of the slurry chamber 1, and the baffle 17 is always present from the slurry gap E to the discharge port 11 in the longitudinal direction during the process of coating the coated substrate 5. That is, when the slurry dam 17 is driven against the outer periphery of the coating back roll 3, the coated base material 5 is controlled to form the longitudinal margin 61 as shown in fig. 3 due to the dam of the slurry by the dam plate 17.
This embodiment still is equipped with the discharge gate shrouding 12 that sets up along 5 width direction of coating substrate in thick liquids chamber 1, discharge gate shrouding 12 is located between discharge gate 11 and the guide plate 14 (discharge gate shrouding 12 also can set up the rear at discharge gate 11), and keeps away from or is close to coating backing roll 3 under the drive of discharge gate shrouding driver, when discharge gate shrouding 12 is driven to support and presses in coating backing roll 3's periphery, because discharge gate shrouding 12 blocks to thick liquids to control coating substrate 5 forms as shown in fig. 3 horizontal whitewashed district 62 that leaves.
The specific working process of this embodiment is as follows: in order to ensure the coating effect, the slurry is conveyed into the slurry cavity 1 through the slurry inlet 15, the slurry cavity above the coating base material 5 corresponding to the section from the front of the slurry gap E to the rear of the discharge port 11 is filled with the slurry, the pressure in the slurry cavity 1 is kept constant, then the gas in the vacuum cavity 2 is continuously pumped through the vacuum pumping port 21 to form a low-pressure vacuum space, after the coating base material 5 bypasses the roller 4, the gas passes through the vacuum sealing constant speed roller 23 and the vacuum sealing roller 24 which are arranged on the shell of the vacuum cavity 2 and enter the vacuum cavity 2 (or sequentially passes through the vacuum sealing constant speed roller 23 and the coating back roller 3 and the press roller 25 and the coating back roller 3 as shown in figure 4 and shown in figure 1 or sequentially passes through the vacuum sealing constant speed roller 23 and the coating back roller 3, the pass roller 4, the press roller 25 and the coating back roller 3 as shown in figure 5 or sequentially passes through the vacuum sealing constant speed roller 23 and the coating back roller 3 as shown in figure 6, passing between the sealing member and the application backing roll); thereafter, the coated substrate 5 enters a one-pass coating process, as shown in fig. 3, the coated substrate 5 passes through the slurry gap E for one-pass coating, and then the coated substrate 5 continues to move forward with the slurry under the driving of the coating backing roll 3. After that, the coating substrate 5 starts to enter a two-pass coating process, as shown in fig. 3, the gap D of the deflector generates extrusion force on the slurry, and the slurry and the coating substrate 5 are further coated and pasted tightly under the double extrusion action of the pressure and the gap D of the deflector, so that the foil leaking area which is not fully coated in one pass can be fully coated.
The coating substrate 5 with the slurry continuously moves along the substrate moving direction, and then the coating substrate 5 starts to enter three coating processes, as shown in fig. 3, an area F is formed between the discharge port 11 and the coating back roller 3, the shape of the discharge port in the area F can be any one of a plane, an arc, a curve or a special shape, wherein a discharge port gap G between the discharge port 11 and the coating back roller 3 can be adjusted by the driving of a discharge port driver, and the value range of G is 0.01 mm-5 mm; the included angle between the discharge port 11 and the coating back roller 3 is A, one side of the included angle A is a tangent line of a point on the coating back roller 3 closest to the discharge port 11, and the other side is a connecting line of the point on the discharge port 11 closest to the coating back roller 3 and a point on the discharge port 11 second closest to the coating back roller 3. In this embodiment, the discharge port 11 is an outer wall of the slurry chamber 1, and the external driver drives the baffle plate forming the discharge port 11 to move, so as to control the size of a, wherein a ranges from 0 ° to 60 °.
Because the discharge hole sealing plate 12 is arranged in the embodiment, the distance between the discharge hole sealing plate 12 and the discharge hole 11 is B, and the value range of B is 0.1 mm-15 mm. When the discharge port sealing plate 12 is driven by the discharge port sealing plate driver to be close to the back roll 3 and to be in close contact with the back roll 3, the slurry on the coating substrate 5 is blocked in the slurry cavity 1, and the slurry cannot pass through a discharge port gap G, so that a transverse blank area 62 of the pole piece 6 is realized; when control discharge gate shrouding 12 left F is regional (discharge gate shrouding driver control discharge gate shrouding 12 is kept away from backing roll 3 and is retracted to the discharge gate gap G that leaks promptly), thick liquids can pass through discharge gate gap G again, and F is regional to thick liquids production extrusion force this moment, and coating substrate 5 takes thick liquids to pass through F is regional, and unnecessary thick liquids can return to thick liquids chamber 1 through F is regional.
In addition, a gap C is formed between the guide plate 14 and the discharge hole 11, the size of the gap C can be controlled by controlling the guide plate driver 16 to drive the guide plate 14 to move, and adjustment of the transverse coating thickness is achieved, wherein the value range of the gap C is 0.01-15 mm, when the gap C is reduced, the resistance of slurry returning from the lower portion of the discharge hole 11 to the slurry cavity 1 is increased, further, the pressure of the discharge hole 11 to the slurry is increased, at the moment, the coating thickness is increased along with the increase of the slurry amount through the gap G, otherwise, when the gap C is increased, the coating thickness is reduced along with the increase of the slurry amount, and finally, slurry with the preset thickness is carried out from the discharge hole gap G between the discharge hole 11 and the coating back roll through the coating base material 5 in the region F to form the undried pole piece 6.
EXAMPLE 2 Secondary Battery high-viscosity slurry coating apparatus
As shown in fig. 7 and 8, the present embodiment has substantially the same structure as that of embodiment 1, except that in order to achieve the vacuum effect of the vacuum chamber 2, 4 vacuum ports 21 for extracting gas are provided on the vacuum chamber 2 before the coating substrate 5 contacts the slurry, and during the use, the gas in the vacuum chamber 2 is gradually extracted from each vacuum port 21 along the moving direction of the coating substrate 5, so as to form a gradient vacuum region, such that the closer to the slurry position, the higher the vacuum degree is, and finally, the vacuum environment of the contact region between the slurry and the substrate is achieved; as shown in fig. 7 and 8, the introducing mechanism includes an introducing member provided between the adjacent 2 vacuum outlets 21, the introducing member is provided on the housing of the vacuum chamber 2 and pressed against the outer periphery of the application back roller 3, and the application base material 5 passes between the introducing member and the application back roller 3. The coating substrate introducing member is a press roller 25 (a sealing member 27 or a height-filling block may be selected, specifically, the sealing member 27 is a flexible member such as a rubber strip, a silicone strip, or a fluororubber strip, and the height-filling block is a hard member made of a material such as stainless steel or aluminum alloy). Other structures of this embodiment are the same as those of embodiment 1, and are not described herein again.
Example 3 coating method of high viscosity paste for secondary battery
This example provides a method for applying a high-viscosity slurry for a secondary battery, which is performed according to the apparatus for applying a high-viscosity slurry for a secondary battery provided in example 1.
In the coating method of the embodiment, the coating substrate 5 is firstly coated once through the slurry gap in the vacuum environment, and then the slurry with high viscosity can drive the thin gas on the surface of the substrate when the coating substrate 5 is coated for the first time, so that the problems of pinholes, foil leakage, bubbles and the like caused by the existence of a large amount of gas on the surface of the coating substrate 5 in the coating process can be effectively avoided; then the coating base material 5 is coated for two times through the gap of the gap-adjustable guide plate, so that the coating of the slurry on the coating base material 5 is more compact, and the foil leakage area which is not fully coated in one time is effectively coated in a supplementing manner; and finally, coating the base material 5 for three times through a discharge hole gap for controlling the thickness of the coating slurry.
After the three coating processes, the coated substrate 5 can be coated with a high viscosity slurry to form a smoother and more uniform electrode sheet.
In the embodiment, the gap between the guide plate and the gap between the discharge port can be adjusted under the driving of the external driving mechanism, wherein the adjustment range of the gap between the guide plate is 0.2-15 mm, and the adjustment range of the gap between the discharge port is 0.01-5 mm.
In order to improve the embodiment, after the other coating substrate is coated through the gap of the guide plate or the gap of the discharge port, a transverse whitening treatment step is arranged, and in the process that the coating substrate is coated from the gap of the slurry to the gap of the discharge port, a longitudinal whitening treatment step is simultaneously arranged, so that the transverse whitening area 62 and the longitudinal whitening area 61 of the coating can be controlled according to specific coating requirements.
Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A coating method of high-viscosity slurry for secondary batteries is characterized in that: the coating substrate is coated through a slurry gap in a vacuum environment and a discharge port gap for controlling the thickness of the coating slurry in sequence to obtain a pole piece uniformly coated, and the discharge port gap is arranged by depending on a slurry cavity.
2. The method for coating a secondary battery high-viscosity slurry according to claim 1, characterized in that: after the coating substrate is coated through the slurry gap and before the coating is carried out through the discharge port gap, the coating substrate is also coated through the guide plate gap.
3. The method for coating a secondary battery high viscosity slurry according to claim 2, characterized in that: the guide plate gap and the discharge hole gap can be adjusted in size under the driving of an external driving mechanism.
4. The method for coating a secondary battery high viscosity slurry according to claim 3, characterized in that: the gap of the guide plate is 0.2-15 mm, and the gap of the discharge port is 0.01-5 mm.
5. The method for coating a secondary battery high viscosity slurry according to claim 4, characterized in that: after the coating base material is coated through the gaps of the guide plates or the gaps of the discharge ports, a transverse whitening treatment step is arranged; the coating substrate is simultaneously provided with a longitudinal whitening treatment step in the process of coating from the slurry gap to the discharge hole gap.
6. The coating apparatus for the secondary battery high viscosity slurry coating method according to any one of claims 1 to 5, characterized in that: the coating device comprises a coating back roller (3), wherein a coating member is arranged on the coating back roller (3), the coating member is of a cavity structure, a slit for coating a coating base material is formed by the periphery of the coating member and the coating back roller (3), the coating member comprises a vacuum cavity (2) and a slurry cavity (1) which are communicated through a slurry gap for coating the coating base material (5) for the first time, a vacuumizing opening (21) for extracting gas is formed in the vacuum cavity (2), and a coating base material introducing mechanism is arranged at one end, far away from the slurry cavity (1), of the vacuum cavity (2); a slurry feeding port (15) for injecting slurry is formed in the slurry cavity (1), and a discharge port (11) for recoating the coating base material and guiding out the coating base material is formed between the coating back roll (3) and a shell at one end, far away from the vacuum cavity (2), of the slurry cavity (1).
7. The coating apparatus of claim 6, wherein: a guide plate (14) which moves along the movement direction of the coating base material (5) under the drive of an external drive mechanism is also arranged in the slurry cavity (1), and a guide plate gap for secondary coating of the coating base material is formed between the guide plate (14) and the periphery of the coating back roll (3).
8. The coating apparatus according to claim 6 or 7, wherein: the coating back roll is characterized in that a slurry baffle (17) parallel to the movement direction of the coating base material (5) is arranged in the slurry cavity (1), the length of the slurry baffle (17) is extended to a discharge hole (11) from a slurry gap, and the slurry baffle (17) is far away from or close to the coating back roll (3) under the driving of an external driving mechanism.
9. The coating apparatus as set forth in claim 6 or 7, wherein: it still includes discharge gate shrouding (12) that set up along coating substrate (5) width direction, discharge gate shrouding (12) are located between discharge gate (11) and guide plate (14) or the rear of discharge gate (11), and keep away from or be close to coating backing roll (3) under external drive mechanism's the drive.
10. Coating device according to claim 6 or 7, characterized in that: the coating substrate guiding mechanism is one of the following structures:
Figure DEST_PATH_IMAGE001
) The coating device comprises a vacuum sealing constant-speed roller (23) and a vacuum sealing roller (24) which are arranged on a shell of a vacuum cavity (2) and are tangent, and a base material (5) in a coating area passes through the vacuum sealing constant-speed roller (23) and the vacuum sealing roller (24);
Figure DEST_PATH_IMAGE002
) The coating device comprises a vacuum sealing constant-speed roller (23) arranged on a shell of a vacuum cavity (2), wherein the vacuum sealing constant-speed roller (23) is tangent to a coating back roller (3), a press roller (25) tangent to the coating back roller (3) is arranged in the vacuum cavity (2), and a coating base material (5) sequentially passes through the space between the vacuum sealing constant-speed roller (23) and the coating back roller (3) and the space between the press roller (25) and the coating back roller (3);
Figure 182293DEST_PATH_IMAGE003
) The coating machine comprises a vacuum sealing constant-speed roller (23) arranged on a shell of a vacuum cavity (2), wherein the vacuum sealing constant-speed roller (23) is tangent to a coating back roller (3), a roller (4) and a pressing roller (25) tangent to the coating back roller (3) are arranged in the vacuum cavity (2), and a coating base material (5) sequentially passes through a space between the vacuum sealing constant-speed roller (23) and the coating back roller (3), the roller (4), the pressing roller (25) and the coating back roller (3);
Figure DEST_PATH_IMAGE004
) Comprises a sealing component (27) which is arranged on a shell of a vacuum cavity (2) and is pressed against the periphery of a coating back roller (3), and a coating base material (5) passes through between the sealing component (27) and the coating back roller (3).
11. The coating apparatus according to claim 6 or 7, wherein: the vacuum pumping ports (21) comprise at least 2 vacuum chambers (2) which are arranged at intervals along the moving direction of the coating base material (5); the leading-in mechanism comprises leading-in components arranged between 2 adjacent vacuumizing ports (21), the leading-in components are arranged on the shell of the vacuum cavity (2) and are pressed against the periphery of the coating back roller (3), and the coating base materials (5) pass through the space between the leading-in components and the coating back roller (3).
12. The secondary-battery high-viscosity paste coating apparatus as set forth in claim 7, wherein: the gap between the guide plate (14) and the coating back roller (3) is 0.2-15 mm, the gap between the discharge port (11) and the coating back roller (3) is 0.01-5 mm, the distance between the discharge port sealing plate (12) and the discharge port (11) is 0.1-15 mm, and the distance between the guide plate (14) and the discharge port (11) is 0.01-15 mm.
13. The secondary battery high viscosity paste application apparatus according to claim 7 or 12, characterized in that: the included angle between the discharge port (11) and the coating back roll (3) is 0-60 degrees.
CN202210281114.2A 2022-03-22 2022-03-22 Coating method and device for high-viscosity slurry of secondary battery Pending CN114653547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210281114.2A CN114653547A (en) 2022-03-22 2022-03-22 Coating method and device for high-viscosity slurry of secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210281114.2A CN114653547A (en) 2022-03-22 2022-03-22 Coating method and device for high-viscosity slurry of secondary battery

Publications (1)

Publication Number Publication Date
CN114653547A true CN114653547A (en) 2022-06-24

Family

ID=82031725

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210281114.2A Pending CN114653547A (en) 2022-03-22 2022-03-22 Coating method and device for high-viscosity slurry of secondary battery

Country Status (1)

Country Link
CN (1) CN114653547A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116159707A (en) * 2022-12-12 2023-05-26 安徽品优电池有限公司 Lithium ion battery electrode slurry homogenate coating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116159707A (en) * 2022-12-12 2023-05-26 安徽品优电池有限公司 Lithium ion battery electrode slurry homogenate coating device
CN116159707B (en) * 2022-12-12 2024-04-12 安徽品优电池有限公司 Lithium ion battery electrode slurry homogenate coating device

Similar Documents

Publication Publication Date Title
CN114653547A (en) Coating method and device for high-viscosity slurry of secondary battery
JP2010108678A (en) Electrode plate for nonaqueous secondary battery, and method and device for manufacturing the same
CN103909036B (en) The coating machine of lithium-ion-power cell
JP2013069645A (en) Coating device and coating method of electrode member of secondary battery
JP2010232073A (en) Method of manufacturing electrode for nonaqueous electrolyte secondary battery
CN217411305U (en) Coating device for high-viscosity slurry of secondary battery
CN102259082A (en) Paste baffle assisting polar plate to coat paste
JP4383008B2 (en) Fuel cell separator, method of laminating membrane / electrode assembly, and laminating apparatus
JP2012179540A (en) Coating apparatus and coating film formation system
US10399112B2 (en) Method and device for intermittent coating
CN216368664U (en) Coating device
US20230219112A1 (en) Dual Slot Die Coater Including Air Vent
CN204303935U (en) Be applicable to the equipment of lithium-ion battery with aluminium plastic film encapsulation
CN116273690A (en) Device for coating diaphragm with extrusion slurry and coating method
CN113727786B (en) Intermittent valve and intermittent coating device
KR102110854B1 (en) Coating Device of Electrode Mix Having Main Discharging Member and Auxiliary Discharging Member and Method for Coating with the Same
CN105870506A (en) Aluminum-plastic film packaging method and device
CN210965714U (en) Coating machine
CN115516659A (en) Double-slit die coater and method for coating electrode active material slurry using the same
CN110787966B (en) Lithium battery pole piece coating machine
CN217550275U (en) Backflow constant-temperature coating device
CN219985195U (en) Equipment for coating catalyst layer on proton membrane surface treatment
CN214211171U (en) Improved plaster blocking die
KR20230170252A (en) Dual slot die coater and electrode manufacturing method and electrode using the same
CN219898809U (en) Dimple coating system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination