CN114950864A - Battery pole piece coating machine and method for coating battery pole piece - Google Patents
Battery pole piece coating machine and method for coating battery pole piece Download PDFInfo
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- CN114950864A CN114950864A CN202210692319.XA CN202210692319A CN114950864A CN 114950864 A CN114950864 A CN 114950864A CN 202210692319 A CN202210692319 A CN 202210692319A CN 114950864 A CN114950864 A CN 114950864A
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- pole piece
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- spraying device
- glue layer
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- 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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
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- 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
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- 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
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1015—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target
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- 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
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
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- 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
- H01M4/0419—Methods of deposition of the material involving spraying
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to the technical field of lithium ion batteries, and particularly provides a battery pole piece coating machine and a method for coating a battery pole piece. The method for coating the battery pole piece comprises the steps of conveying the pole piece base material in the coating machine, coating the slurry to the base material by the coating die head when the base material passes through the coating die head, and spraying the slurry to the base material by the glue layer spraying device when the base material passes through the lower part of the coating die head. The invention solves the problem that the sizing agent and the glue layer are mutually soluble because the sizing agent and the glue material are separately arranged.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, and particularly provides a battery pole piece coating machine and a method for coating a battery pole piece.
Background
At present, in the manufacturing process of a lithium ion battery, a laser die cutting process is adopted for improving the die cutting capacity of a positive electrode, but when the positive electrode plate is subjected to laser die cutting, the laser cutting generates higher temperature when the positive electrode plate is subjected to laser die cutting in a black material area of the positive electrode, aluminum melting is generated after an aluminum foil base material of a middle layer is subjected to high temperature of more than 660 ℃, molten aluminum foil meets surrounding cold air and then quickly forms aluminum melt beads, and the aluminum melt beads are likely to roll on a film area of the positive electrode plate and cool and adhere to the film area on a base band moving at the die cutting speed of 4-12 m/min. And the aluminum bead metal foreign matter is attached to the positive plate and enters an assembly section lamination or winding process, and high-voltage insulation breakdown is formed in a hot-pressing short circuit detection process, so that the short circuit of the battery cell is caused. In order to avoid safety failure, the edge of the positive plate is coated with the polymer adhesive layer which has good thermal stability and insulativity, the intermediate aluminum current collector is prevented from being fused too early, the generation of rolling fluid aluminum molten beads is effectively reduced, and the short circuit failure of the assembly section lamination or the winding process can be reduced.
Most of the existing enterprises adopt a method of coating a high polymer adhesive layer by using a die head and a stainless steel gasket, namely, a specific die head is manufactured according to the fluidity and rheological property of slurry, two sets of feeding systems are arranged in an inner cavity of the die head, one set is used for coating the slurry, and the other set is used for coating the high polymer adhesive, but the equipment can cause the following problems: because the glue film is nearer with the thick liquids discharge gate, the problem that sizing material and thick liquids are mutually soluble appears very easily to lead to the glue film to scribble wide great, above-mentioned equipment exists not enoughly in the precision of control glue film width, consequently also leads to the anodal effective active material district of electricity core body not enough very easily, finally causes electric core capacity performance to hang down.
Accordingly, there is a need in the art for a new battery pole piece coating machine and a method for coating a battery pole piece to solve the problem that sizing materials are mutually soluble due to the fact that the sizing materials are too close to the sizing material discharge port when the existing coating machine is used for coating.
Disclosure of Invention
The invention aims to solve the technical problem, namely, the problem that sizing materials and sizing materials are mutually soluble due to the fact that the sizing materials and the sizing materials are too close to each other when the sizing materials and the sizing materials are coated by the existing coating machine is solved.
In a first aspect, the invention provides a battery pole piece coating machine, which comprises a coating die head and a glue layer spraying device, wherein the coating die head and the glue layer spraying device are both arranged above a pole piece substrate conveyed through the coating machine, the coating die head is used for coating liquid slurry on the central area of the pole piece substrate, the glue layer spraying device is used for spraying glue materials on two sides of the central area, and the glue layer spraying device is arranged at the downstream of the coating die head in the direction in which the pole piece substrate is conveyed.
In the preferable technical scheme of the battery pole piece coating machine, the glue layer spraying device is provided with a nozzle, and the nozzle is provided with an adjusting mechanism capable of adjusting the size of a nozzle of the nozzle.
In a preferable technical scheme of the battery pole piece coating machine, the adjusting mechanism comprises a drawing plate, and the drawing plate can be transversely drawn relative to the nozzle, so that the size of the nozzle is adjusted.
In the preferable technical scheme of the battery pole piece coating machine, the drawing plate is provided with scale marks, and the scale marks correspond to the size of the nozzle.
In a preferred technical solution of the above battery pole piece coater, the adjusting mechanism includes a knob assembly, the knob assembly includes a knob for being grasped by a person, a gear and a rack, the gear is connected to or integrally formed with the knob and is engaged with the rack, and when the knob is rotated, the gear drives the rack to move laterally relative to the nozzle, so as to adjust the size of the spout.
In the preferable technical scheme of the battery pole piece coating machine, the rack is provided with scale marks, and the scale marks correspond to the size of the nozzle.
In the preferable technical scheme of the battery pole piece coating machine, the glue layer spraying device comprises an adjustable feeding device, and the adjustable feeding device supplies glue to the nozzle in a flow adjustable manner.
In the preferable technical scheme of the battery pole piece coating machine, the adjustable feeding device comprises a buffer tank, a screw pump and a dispersing paddle, wherein the screw pump injects rubber materials into the buffer tank in a flow-adjustable mode, the dispersing paddle is located in the buffer tank and used for dispersing the rubber materials, and the buffer tank is communicated with the nozzle and used for supplying the rubber materials to the nozzle.
In the preferable technical scheme of the battery pole piece coating machine, a position sensor is arranged on the glue layer spraying device and used for detecting whether the pole piece base material reaches the position below the glue layer spraying device.
The invention also provides a method for coating the battery pole piece by the coating machine, which comprises the following steps:
conveying the pole piece substrate in the coating machine;
controlling the coating die head to apply liquid slurry to the central area of the pole piece substrate when the pole piece substrate passes below the coating die head;
and when the pole piece base material passes through the lower part of the glue layer spraying device, controlling the glue layer spraying device to spray glue materials to two sides of the central area.
In the preferred technical solution of the method for coating a battery pole piece with the coating machine, the glue layer spraying device is provided with a position sensor, and the step of controlling the glue layer spraying device to spray glue to both sides of the central area when the pole piece substrate passes below the glue layer spraying device specifically comprises:
and when the position sensor detects that the pole piece base material reaches the position below the glue layer spraying device, controlling the glue layer spraying device to spray glue materials to the two sides of the central area.
In a preferred technical scheme of the method for coating the battery pole piece by the coating machine, the glue layer spraying device is provided with a nozzle, the nozzle is provided with an adjusting mechanism capable of adjusting the size of a nozzle, and the method further comprises the following steps:
and adjusting the nozzle size of the nozzle through the adjusting mechanism before controlling the glue layer spraying device to spray glue to two sides of the central area.
In a preferred technical scheme of the method for coating the battery pole piece by the coating machine, the glue layer spraying device comprises an adjustable feeding device, and the step of controlling the glue layer spraying device to spray glue materials to two sides of the central area specifically comprises the following steps:
and controlling the adjustable feeding device to spray glue materials to two sides of the central area at a set flow rate so as to obtain a glue layer with a set thickness.
In the preferable technical scheme of the method for coating the battery pole piece by the coating machine, the adjustable feeding device comprises a buffer tank, a screw pump and a dispersing paddle, wherein the screw pump injects rubber materials into the buffer tank in a flow-adjustable mode, and the dispersing paddle is located in the buffer tank and used for dispersing the rubber materials.
Under the condition of adopting the technical scheme, the invention separately arranges the discharge ports of the sizing material and the sizing material, firstly coats the sizing material, and then coats the sizing material, at the moment, the discharge ports of the sizing material and the sizing material are not required to be arranged in the coating die head, and the discharge ports of the sizing material are independently arranged at the outer side of the coating die head, thereby solving the problem that the sizing material and the sizing material are mutually soluble due to the fact that the discharge ports of the sizing material and the sizing material are too close, in addition, the coating die head does not coat the sizing material any more, therefore, the gasket on the coating die head only needs to be arranged to meet the coating requirement of the sizing material, meanwhile, the sizing material spraying device can adjust the glue outlet width, different product models, namely different glue layer widths required by different types of the battery pole pieces can be met by the sizing material spraying device, therefore, the coating machine and the method not only solve the problem that the sizing material and the sizing material are mutually soluble due to simultaneous spraying, and can also satisfy the glue spraying requirements of different product models, and hardware compatibility is improved.
Scheme 1, a battery pole piece coating machine, comprising a coating die head and a glue layer spraying device,
the coating die head and the glue layer spraying device are arranged above a pole piece substrate conveyed through the coating machine, the coating die head is used for coating liquid slurry on the central area of the pole piece substrate, the glue layer spraying device is used for spraying glue materials on two sides of the central area, and the glue layer spraying device is arranged at the downstream of the coating die head in the conveying direction of the pole piece substrate.
Scheme 3, according to scheme 2 the battery pole piece coating machine is characterized in that, the adjusting mechanism includes a drawing plate, the drawing plate can be transversely drawn relative to the nozzle, and therefore the size of the nozzle is adjusted.
Scheme 4, according to scheme 3 battery sheet coating machine, characterized in that, be provided with the scale mark on the pull board, the scale mark with the size of spout corresponds.
Scheme 5, the battery pole piece coating machine of scheme 2, characterized in that, the adjustment mechanism includes knob subassembly, the knob subassembly includes knob, gear and rack, the knob is used for the people to grasp, the gear is connected to the knob or is made with the knob is integrative and with the rack meshing, when the knob is rotated, the gear drives the rack and moves transversely relative to the nozzle, thereby adjusts the size of spout.
Scheme 6, according to scheme 5 battery pole piece coating machine, characterized in that, be provided with the scale mark on the rack, the scale mark with the size of spout corresponds.
Scheme 7, according to any one of scheme 2 to 6 battery pole piece coating machine, characterized in that, glue film spraying device includes adjustable feedway, adjustable feedway is for the nozzle supply sizing material with the mode of flow adjustable.
Scheme 8 and 7 are characterized in that the adjustable feeding device comprises a buffer tank, a screw pump and a dispersing paddle, wherein the screw pump pumps sizing materials into the buffer tank in a flow-adjustable mode, the dispersing paddle is located in the buffer tank and used for dispersing the sizing materials, and the buffer tank is communicated with the nozzle and used for supplying the sizing materials to the nozzle.
Scheme 9, according to any one of scheme 1 to 6 battery pole piece coating machine, characterized in that, be provided with position sensor on the glue film spraying device, position sensor is used for detecting whether pole piece substrate reachs the below of glue film spraying device.
Scheme 10, a method for coating a battery pole piece using the coater of scheme 1, the method comprising the steps of:
conveying the pole piece substrate in the coating machine;
controlling the coating die head to apply liquid slurry to the central area of the pole piece substrate when the pole piece substrate passes below the coating die head;
and when the pole piece base material passes through the lower part of the glue layer spraying device, controlling the glue layer spraying device to spray glue materials to two sides of the central area.
and when the position sensor detects that the pole piece base material reaches the position below the glue layer spraying device, controlling the glue layer spraying device to spray glue materials to the two sides of the central area.
Scheme 12, the method according to scheme 10, wherein the glue layer spraying device is provided with a nozzle, the nozzle is provided with an adjusting mechanism capable of adjusting the size of the nozzle, and the method further comprises:
and adjusting the nozzle size of the nozzle through the adjusting mechanism before controlling the glue layer spraying device to spray glue to two sides of the central area.
Scheme 13 and the method according to scheme 10, wherein the glue layer spraying device includes an adjustable feeding device, and the step of controlling the glue layer spraying device to spray glue to both sides of the central area specifically includes:
and controlling the adjustable feeding device to spray glue materials to two sides of the central area at a set flow rate so as to obtain a glue layer with a set thickness.
The method according to claim 14 or 13, characterized in that the adjustable feeding device comprises a buffer tank, a screw pump and a dispersing paddle, wherein the screw pump pumps the rubber material into the buffer tank in a flow-adjustable manner, and the dispersing paddle is located in the buffer tank and used for dispersing the rubber material.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram showing the positional relationship between the glue layer spraying device and the substrate of the battery pole piece coating machine of the present invention;
FIG. 2 is a schematic structural diagram of a glue layer spraying device of the battery pole piece coating machine of the present invention;
FIG. 3 is a schematic view of a nozzle structure of a glue layer spraying device of the battery pole piece coating machine of the invention;
FIG. 4 is a flow chart of the main steps of the coating method of the battery pole piece of the present invention.
List of reference numerals:
1. coating machine; 11. a glue layer spraying device; 111. a nozzle; 1111. a spout; 1112. a drawing plate; 2. pole piece base material; 20. a central region; 21. on both sides of the central region.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
It should be noted that in the description of the present invention, the terms "central", "upper", "lower", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-3, in order to solve the problem that the sizing material and sizing material are mutually soluble when the existing battery pole piece coating machine is used for coating, the battery pole piece coating machine 1 of the present invention comprises a coating die head (not shown in the figure) and a glue layer spraying device 11, wherein the coating die head and the glue layer spraying device 11 are both arranged above a pole piece substrate 2 conveyed to pass through the coating machine 1, the coating die head is used for coating liquid sizing material (generally, the positive pole sizing material is composed of adhesive, conductive agent, positive pole material, etc., the negative pole sizing material is composed of adhesive, graphite carbon powder, etc.) to a central area 20 of the pole piece substrate 2, the glue layer spraying device 11 is used for spraying sizing material to two sides 21 of the central area, the glue layer spraying device 11 is disposed downstream of the coating die in the direction in which the pole piece substrate 2 is conveyed (i.e., the direction from right to left in fig. 1).
Preferably, as shown in fig. 2 and 3, the glue layer spraying device 11 is provided with a nozzle 111, the nozzle 111 is provided with a drawing plate 1112 capable of adjusting the size of a nozzle 1111 of the nozzle 111, and the drawing plate 1112 can be pulled transversely relative to the nozzle 111 to adjust the size of the nozzle 1111. The drawing plate 1112 can be provided with scale marks (not shown in the figure), and the scale marks correspond to the size of the nozzle 1111. In addition, the glue layer spraying device 11 further includes a buffer tank (not shown), a screw pump (not shown) and a dispersing paddle (not shown), the screw pump pumps glue into the buffer tank in a flow-adjustable manner, the dispersing paddle is located in the buffer tank and used for dispersing the glue, the buffer tank is communicated with the nozzle 111 and used for supplying the glue to the nozzle 111, and therefore the screw pump supplies the glue to the nozzle 111 in a flow-adjustable manner, so that the thickness of the glue layer sprayed on the pole piece substrate 2 is controlled. In a preferred mode, a position sensor (not shown in the figure) is arranged on the glue layer spraying device 11, and the position sensor is used for detecting whether the pole piece substrate 2 reaches the lower part of the glue layer spraying device 11.
The setting mode has the advantages that: pole piece substrate 2 sets up in the below of coating die head, at first use the coating die head to the central zone 20 coating of pole piece substrate 2 fixed thick liquids width, after a distance to pole piece substrate 2 coating, pole piece substrate 2 moves the below of glue film spraying device 11, according to pole piece substrate 2 to the thickness demand of glue film, set for the flow of the sizing material of spraying, and simultaneously, in order to satisfy the demand of different products to the glue film width, spout 1111 department on glue film spraying device 11 sets up the pull board 1112 that can adjust the spout size, set up the scale mark on pull board 1112 and correspond the size of spout 1111, adjust the position of pull board 1112 according to the product demand, make it correspond to the required size's of spout 1111 instruction scale mark department, adjust the play of spout 1111 width with this. The glue layer spraying device 11 is arranged at the downstream of the coating die head, and when the electrode plate base material 2 reaches the position below the glue layer spraying device 11, the coated sizing agent is slightly solidified, and then the sizing agent is sprayed, so that the mutual solubility problem caused by the simultaneous spraying of the sizing agent and the sizing agent can be avoided. In addition, in order to ensure that the sprayed glue is stable and the glue layer is uniformly coated on the pole piece base material 2, the glue layer spraying device 11 is provided with a screw pump for supplying materials, the screw pump is uniform and continuous in glue discharging relative to an air pressure pump, and the pressure of the screw pump is stable, so that the glue layer on the pole piece base material 2 is more easily and uniformly coated. The glue layer spraying device 11 can also be provided with a position sensor, the position sensor is used for detecting whether the pole piece base material 2 coated with the slurry runs to the position below the glue layer spraying device 11, and if the pole piece base material 2 is detected to run to the position below the glue layer spraying device 11, the glue layer spraying device 11 is started to perform glue layer coating on the two sides of the pole piece base material 2.
Although the adjustment mechanism is described above as a pull plate 1112, this is not limiting and those skilled in the art can make changes to the specific form of the adjustment mechanism without departing from the principles of the invention. For example, in one possible embodiment, the adjustment mechanism may also be provided in the form of a knob assembly (not shown). Specifically, the knob assembly includes a knob for gripping by a person, a gear attached to or integrally formed with the knob and engaged with the rack, and a rack that, when the knob is turned, the gear drives the rack to move laterally relative to the nozzle 111, thereby adjusting the size of the spout 1111. More preferably, a graduation mark is provided on the rack, and the graduation mark corresponds to the size of the spout 1111.
Knob subassembly carries out the rotation through the knob and drives the gear operation, and then drives the rack motion, realize the regulation to spout 1111 size through the motion of rack in spout 1111 department, it is similar through the embodiment of the size of a dimension of pull regulation spout 1111 with pull board 1112 among the aforesaid, equally, also can be provided with the scale mark that corresponds spout 1111 size on the rack, before glue film spraying device 11 carries out the spraying work, adjust spout 1111 size through knob subassembly, and then the play of control spout 1111 glues the width.
Of course, the pull plate 1112 and the knob assembly each have advantages and disadvantages in terms of size adjustment of the spout 1111. Specifically, the drawing plate 1112 has a simple structure, low cost, but limited operation precision, and the knob assembly is easy to precisely adjust and control, but has a relatively high cost due to a relatively responsible structure, and can be selected by a person skilled in the art according to the needs of an actual application scenario.
Furthermore, although the adjustable feeding device is described above as comprising a buffer tank into which the glue is injected in an adjustable flow, a screw pump located in the buffer tank for dispersing the glue, and a dispersing paddle in communication with the nozzle 111 for supplying the glue to the nozzle 111. This is not intended to be limiting and those skilled in the art may make variations in the specific form of the adjustable feed device without departing from the principles of the present invention. For example, the regulation and control of the flow of sizing material can be achieved by means of a combination of a conventional pump and a variable-opening solenoid valve.
Referring finally to fig. 4, the present invention also provides a method for coating a battery pole piece using the coating machine 1 shown in fig. 1-3. As shown in fig. 4, the method for coating the battery pole piece mainly comprises the following steps:
s100: conveying a pole piece substrate 2 in a coating machine 1;
s200: when the pole piece substrate 2 passes below the coating die head, controlling the coating die head to coat the liquid slurry on the central area 20 of the pole piece substrate 2;
s300: when the pole piece base material 2 passes below the glue layer spraying device 11, the glue layer spraying device 11 is controlled to spray glue to the two sides 21 of the central area.
In a preferred embodiment of the glue layer spraying device 11 for spraying glue, a position sensor is arranged on the glue layer spraying device 11, the position sensor detects whether the pole piece substrate 2 coated with the slurry runs below the glue layer spraying device 11, and when the position sensor detects that the pole piece substrate 2 reaches below the glue layer spraying device 11, the glue layer spraying device 11 is controlled to spray glue to two sides 21 of the central area of the pole piece substrate 2.
In another preferred embodiment of the glue spraying device 11 for spraying glue, a nozzle 111 is arranged on the glue spraying device 11, an adjusting mechanism capable of adjusting the size of the nozzle 1111 is arranged on the nozzle 111, the size of the nozzle 1111 to be set is adjusted by the adjusting mechanism, and the adjustment of the size of the nozzle 1111 is required to be performed before the glue spraying device 11 is controlled to spray glue to the two sides 21 of the central area of the pole piece substrate 2, namely, the glue is sprayed after the size of the nozzle 1111 is adjusted.
In another preferred manner of the glue spraying device 11 for spraying the glue, the glue spraying device 11 further includes an adjustable feeding device, the adjustable feeding device includes a buffer tank, a screw pump and a dispersing paddle, the screw pump pumps the glue into the buffer tank in a flow-adjustable manner, the dispersing paddle is located in the buffer tank for dispersing the glue, and the buffer tank is communicated with the nozzle 111 for supplying the glue to the nozzle 111. And (3) stably and uniformly spraying sizing materials to two sides 21 of the central area of the pole piece base material 2 at a set flow rate through a screw pump, and outputting through the set flow rate of the screw pump so as to obtain the required thickness of the sizing layer on the pole piece base material 2.
The technical effects of the present invention will be described below by the conventional comparative examples and examples 1 and 2 using the present invention.
Comparative example:
the electrode sheet base material 2 was coated using a coating die shimming method: the width of the coating anode is designed according to 201 +/-1 mm (the width of a slurry area is 197 +/-1 mm, the width of an adhesive layer is 4 +/-1 mm), a coating gasket is prepared in advance, a mold is repaired, the chamfer angle of the gasket is formed, and the double-sided surface density of the material area is 37.92 +/-0.4 mg/cm 2 Coating the adhesive layer with the thickness of more than 25 micrometers, compacting according to the design after coating, rolling, die cutting by using a laser die cutting machine according to the width 198 +/-1 mm (the width of a slurry area is 196 +/-1 mm, and the width of the adhesive layer is 2 +/-1 mm) of a pole piece, splitting a die-cut roll into two halves, wherein the splitting width is 99 +/-1 mm, baking the split roll until the moisture is qualified, stacking, welding, packaging, injecting, infiltrating, forming, final sealing, air exhausting, capacity grading, aging, K value screening and other battery cell manufacturing processes are carried out, and the capacity grading at 25 +/-3 ℃ is more than or equal to 190 Ah.
Example 1:
coating width coating slurry according to 197 +/-1 mm by using a coating die head gasket adding method, coating adhesive layers on two sides of a slurry area by using an adhesive layer spraying device 11 after coating 50cm length of the slurry, setting the size of a nozzle 1111 according to the width of the adhesive layer 4 +/-0.5 mm by using an adjusting mechanism in advance, setting spraying flow according to the thickness of the adhesive layer, adjusting a nozzle 111 to 5mm of the height of a pole piece base material 2 in advance, starting an adhesive layer spraying device 11 switch after the work is prepared, compacting and rolling according to the design after coating, performing die cutting by using a laser die cutting machine according to the width 198 +/-1 mm of the pole piece (the width of the slurry area is 196 +/-1 mm, and the width of the adhesive layer is 2 +/-0.5 mm), and performing the steps after the laser die cutting are the same as the steps after the comparison.
Example 2:
the procedure of this example was the same as in example 1, with the following differences: the size of a nozzle 1111 and the spraying flow rate are manually set in advance according to the width of the glue layer being 3 +/-0.5 mm and the thickness of the glue layer being more than 30um, and a laser die cutting machine is used for carrying out die cutting according to the width 198 +/-1 mm of the pole piece (the width of the material being 196 +/-1 mm and the width of the glue layer being 1 +/-0.5 mm).
The manufacturing data of the comparative example and the example 1 are shown in table 1, the manufacturing data of the example 2 are shown in table 2, the adhesive layer peel strength is 180-degree peel test, the selected adhesive layer thickness is 25um, the Hipot (high voltage insulation test) defective rate refers to the rate that the cell lasts for 10s under the voltage of 100V, the resistance value of the insulation resistance of the cell is less than 10M omega, and 200 cells are selected for the Hipot defective rate test.
Table 1:
table 2:
as can be seen by comparison, the coater 1 and the coating method thereof of the invention reduce the mutual soluble width of the sizing agent and the glue layer compared with the conventional method, increase the effective active material area of the positive electrode of the cell body, thereby increasing the capacity of the cell, simultaneously improving the peel strength of the glue layer, and reducing the Hipit reject ratio, in addition, because the different product models need different coating widths of the glue layer, the models of the gaskets needed by different product models are different, the purchasing of the gaskets has increased cost, and the gasket purchasing cycle is generally about ten days, the model changing speed is slow, but the sizing agent discharge port and the glue material discharge port are separately arranged due to the improvement of the glue layer spraying device 11, the different glue layer widths needed by different product models only need to adjust the glue layer spraying device 11, thereby meeting the requirements of different product models, the product model changing time is shortened. In addition, can make spout 1111 play glue width more accurate through adjustment mechanism such as pull board 1112, make the sizing material play glue stably and glue film thickness even through the control of screw pump. Compared with the conventional coating machine 1 and the operation method, the coating machine 1 and the coating method provided by the invention meet the design standard, have higher precision, better cell consistency, lower cost and higher production efficiency, and provide convenience for batch production.
In summary, the coating machine 1 can not only rapidly coat the adhesive layer, but also ensure the uniformity of the coating of the adhesive layer, and the coating width of the adhesive layer can be flexibly adjusted by adjusting the size of the nozzle 1111, and the requirements of different product models can be met, so that the coating machine 1 of the invention has wide applicability and high flexibility, and the processing cost is reduced.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structure so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
Although the foregoing embodiments describe the steps in the above sequential manner, it can be understood by those skilled in the art that, in order to achieve the effect of the present embodiment, the different steps need not be performed in the above sequential manner, and they may be performed simultaneously (in parallel) or in reverse order, for example, the order of "controlling the coating die to apply the liquid slurry to the central region 20 of the pole piece substrate 2 when the pole piece substrate 2 passes under the coating die" and "controlling the glue layer spraying device 11 to apply the glue to the two sides 21 of the central region when the pole piece substrate 2 passes under the glue layer spraying device 11" may be switched, and the glue layer spraying and then the slurry spraying may be performed, and these simple changes are within the protection scope of the present invention.
In addition, the size coating is performed on both sides of the size region using the size layer spraying apparatus 11 after the size coating mentioned in example 1 is performed for a length of 50cm, wherein the size coating is not performed simultaneously with the size coating, and is not limited to starting the size coating after the size coating is performed for 50 cm.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A battery pole piece coating machine, which comprises a coating die head and a glue layer spraying device,
the coating die head and the glue layer spraying device are arranged above a pole piece base material conveyed through the coating machine, the coating die head is used for coating liquid slurry on the central area of the pole piece base material, the glue layer spraying device is used for spraying glue materials on two sides of the central area, and the glue layer spraying device is arranged at the downstream of the coating die head in the conveying direction of the pole piece base material.
2. The battery pole piece coating machine according to claim 1, wherein a nozzle is arranged on the glue layer spraying device, and an adjusting mechanism capable of adjusting the size of a nozzle opening of the nozzle is arranged on the nozzle.
3. The battery pole piece coater of claim 2, wherein the adjusting mechanism comprises a drawing plate which can be pulled transversely relative to the nozzle to adjust the size of the nozzle.
4. The battery pole piece coating machine of claim 3, wherein scale lines are arranged on the drawing plate, and the scale lines correspond to the size of the nozzle.
5. The battery pole piece coater of claim 2, wherein the adjustment mechanism comprises a knob assembly comprising a knob for gripping by a person, a gear attached to or integral with the knob and engaged with the rack, and a rack, wherein when the knob is turned, the gear moves the rack laterally relative to the nozzle to adjust the size of the spout.
6. The battery pole piece coater of claim 5, wherein the rack is provided with scale lines corresponding to the size of the nozzle.
7. The battery pole piece coater of any one of claims 2 to 6, wherein the glue layer spraying device comprises an adjustable supply device which supplies glue to the nozzle in a flow-adjustable manner.
8. The battery pole piece coating machine of claim 7, wherein the adjustable feeding device comprises a buffer tank, a screw pump and a dispersing paddle, the screw pump injects rubber material into the buffer tank in a flow-adjustable manner, the dispersing paddle is located in the buffer tank and used for dispersing the rubber material, and the buffer tank is communicated with the nozzle and used for supplying the rubber material to the nozzle.
9. The battery pole piece coating machine according to any one of claims 1 to 6, wherein a position sensor is arranged on the glue layer spraying device, and the position sensor is used for detecting whether the pole piece substrate reaches the position below the glue layer spraying device.
10. A method of coating a battery pole piece using the coater of claim 1, comprising the steps of:
conveying the pole piece substrate in the coating machine;
controlling the coating die head to apply liquid slurry to the central area of the pole piece substrate when the pole piece substrate passes below the coating die head;
and when the pole piece base material passes through the lower part of the glue layer spraying device, controlling the glue layer spraying device to spray glue materials to two sides of the central area.
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