CN111716616B - Rolling device, equipment for preparing electrode film and application of equipment - Google Patents

Rolling device, equipment for preparing electrode film and application of equipment Download PDF

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Publication number
CN111716616B
CN111716616B CN201910985791.0A CN201910985791A CN111716616B CN 111716616 B CN111716616 B CN 111716616B CN 201910985791 A CN201910985791 A CN 201910985791A CN 111716616 B CN111716616 B CN 111716616B
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conveyor
roll
mixing
rolling
rollers
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CN111716616A (en
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赵晓军
张永虎
张晓东
范一新
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Hefei Jixin Energy Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3405—Feeding the material to the mould or the compression means using carrying means
    • B29C2043/3416—Feeding the material to the mould or the compression means using carrying means conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B29C2043/3405—Feeding the material to the mould or the compression means using carrying means
    • B29C2043/3427—Feeding the material to the mould or the compression means using carrying means hopper, vessel, chute, tube, conveying screw, for material in discrete form, e.g. particles or powder or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/755—Membranes, diaphragms

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention provides a rolling device, equipment for preparing an electrode film and application of the rolling device. The rolling device includes: the folding device comprises a first conveyor, a folding mechanism, a second conveyor and a roller; the first conveyor and the second conveyor respectively comprise an input end and an output end, and the input end and the output end are connected through a conveyor belt; the input end of the first conveyor is a feeding port of the rolling device; the output end of the first conveyor is positioned above the input end of the second conveyor; the output end of the second conveyor corresponds to the inlet of a roll gap formed by the two roll rollers, and the outlet of the roll gap formed by the two roll rollers is the discharge hole of the roll pressing device; the folding mechanism comprises two rollers which are arranged in parallel, and the two rollers can reciprocate in the horizontal plane simultaneously; and the two rollers of the folding mechanism are arranged below the output end of the first conveyor and above the input end of the second conveyor. The invention can realize continuous film forming and improve the mechanical strength of the film.

Description

Rolling device, equipment for preparing electrode film and application of equipment
Technical Field
The invention belongs to the field of mechanical preparation of an electrode process of an electrochemical energy storage device, and particularly relates to a rolling device, equipment for preparing an electrode film and application of the rolling device.
Background
The electrode of the electrochemical energy storage device is composed of active substances, conductive agents, adhesives and other material components, and the manufacturing process is to mix the materials by different methods and combine different process means to adhere the mixture on a current collector to construct an electrode plate.
The preparation of electrode film of energy storage device is carried out by mixing active material, conductive agent and adhesive, rolling the mixed raw material on two parallel rollers with different speed and relative rotation to prepare film. Under the shear stress of the differential roller, the high molecular polymer is elongated into a fibrous shape. If the film is rolled in only one direction, the resulting fibers will all be in the rolling direction, and the film will need to be turned at an angle to be rolled again in order to form a network of intersecting fibers. After repeated many times, a plurality of layers of films with fiber networks in a cross structure are formed. The crossing polymer fiber network can coat the active substance and the conductive substance together.
However, the above method has disadvantages in that a continuous film cannot be formed because a certain angle of rotation is required between two roll presses, and the beginning and end portions of the film become waste, i.e., the production efficiency is low and the amount of waste is large. Therefore, there is a need for an apparatus that can produce a continuous electrode film of an energy storage device.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a rolling device, an electrode film preparation device and application thereof, wherein the electrode film can be continuously produced, and the produced electrode film has better interface stability and mechanical strength.
The invention is realized by the following technical scheme:
a rolling apparatus, comprising: the folding device comprises a first conveyor, a folding mechanism, a second conveyor and a roller press roller;
the first conveyor and the second conveyor respectively comprise an input end and an output end, and the input end and the output end are connected through a conveyor belt;
the input end of the first conveyor is a feeding port of the rolling device; the output end of the first conveyor is positioned above the input end of the second conveyor;
the output end of the second conveyor corresponds to the inlet of a roll gap formed by the two roll rollers, and the outlet of the roll gap formed by the two roll rollers is the discharge hole of the roll pressing device;
the folding mechanism comprises two rollers which are arranged in parallel, and the two rollers can reciprocate in the horizontal plane simultaneously;
and the two rollers of the folding mechanism are arranged below the output end of the first conveyor and above the input end of the second conveyor.
Preferably, the central axes of the two rolling rollers of the rolling device are arranged in parallel, and the plane where the two central axes are located is vertical to the horizontal plane;
the central axes of the two rollers in the folding mechanism are vertical to the conveying direction of the first conveyor; the moving directions of the two rollers are parallel to the conveying direction of the first conveyor;
the conveying direction of the first conveyor is perpendicular to the conveying direction of the second conveyor.
Preferably, the folding mechanism further comprises a support plate and a swinging mechanism;
two parallel light bars are fixedly arranged on one side of the supporting plate, and the central axes of the two light bars are positioned in the same horizontal plane; the two rollers are respectively sleeved on the two feed rods; the other side of the supporting plate is connected with the swinging mechanism, and the swinging mechanism can drive the supporting plate to reciprocate;
one ends of the two feed rods are fixed on the supporting plate, and the other ends of the two feed rods are free ends or are connected with the connecting plate; the connecting plate is connected with a sliding block, and the sliding block can reciprocate along the horizontal guide rail.
Preferably, the first conveyor and the second conveyor adopt one or two of a horizontal belt conveyor and a slope climbing belt conveyor;
the moving speeds of the first conveyor and the folding mechanism are the same, and the linear speed of the second conveyor is 1/n of the linear speed of the first conveyor;
n is the number of layers of the single-layer electrode film folded on the second conveyor.
The invention also provides equipment for preparing the electrode film, which comprises a mixing device and M sets of rolling devices; m is a natural number greater than or equal to 1;
the mixing device corresponds to a feeding port of a first set of rolling device, a discharging port of the first set of rolling device corresponds to a feeding port of a second set of rolling device, a discharging port of the second set of rolling device corresponds to a feeding port of a third set of rolling device, and so on, a discharging port of an M-1 set of rolling device corresponds to a feeding port of an M-1 set of rolling device.
The mixing device comprises: at least 2 mixing rolls, chutes and baffles;
the central axes of all the mixing rolls are arranged in parallel;
if the number of the mixing rolls is more than 2, all the mixing rolls are arranged in an S shape from top to bottom; the two adjacent mixing rolls form a roll gap; the inlet of the uppermost roll gap is a feeding port of the mixing device, and the outlet of the lowermost roll gap is a discharging port of the mixing device;
the baffle plates are respectively arranged at the inlet of the uppermost roll gap and the inlet of the lowermost roll gap; the chutes are respectively arranged at the inlets of the middle roll gaps;
preferably, two mixing rolls adjacent to the same mixing roll are respectively positioned above and below the mixing roll; taking a plane on which the central axis of the mixing roll and the central axis of the mixing roll positioned above the mixing roll are positioned as a first plane, taking a plane on which the central axis of the mixing roll and the central axis of the mixing roll positioned below the mixing roll are positioned as a second plane, and symmetrically arranging the first plane and the second plane above and below a horizontal plane on which the central axis of the mixing roll is positioned;
preferably, the baffle comprises two vertical plates vertical to the central axis of the mixing roll; one side edge of each vertical plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the upper mixing roll; the bottom edge of each vertical plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the mixing roll below; the intersection point of two arc edges of each vertical plate is tightly attached to the inlet of a roll gap formed by the upper mixing roll and the lower mixing roll;
preferably, the chute comprises a left side plate, an arc-shaped plate and a right side plate which are connected in sequence and smoothly; the left side edge of the left side plate is an arc-shaped edge, the arc-shaped edge is attached to the outer wall of the upper mixing roll, and the right side edge of the left side plate is connected with the left side edge of the arc-shaped plate; the left side edge of the right side plate is connected with the right side edge of the arc-shaped plate, the right side edge of the right side plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the upper mixing roll; the top edge of the left side plate, the top edge of the arc-shaped plate and the top edge of the right side plate are connected to form the top edge of the chute, and the top edge of the chute is in a V shape with an arc-shaped bottom; the bottom edge of the left side plate, the bottom edge of the arc-shaped plate and the bottom edge of the right side plate are connected to form the bottom edge of the chute, the bottom edge of the chute is in a V shape with an arc-shaped bottom, and meanwhile, the bottom edge of the chute is attached to the outer wall of the mixing roll below the chute; the intersection point of the left side edge and the bottom edge of the left side plate is tightly attached to a roll gap formed by the upper mixing roll and the lower mixing roll; and the intersection point of the right side edge and the bottom edge of the right side plate is closely attached to a roll gap formed by the upper mixing roll and the lower mixing roll.
The discharge port of the mixing device is positioned above the feed port of the first set of rolling devices; the central axis of the mixing roll of the mixing device is vertical to the central axis of the roll of the first set of rolling device;
the central axes of the rolling rollers of two adjacent sets of rolling devices are vertical;
in the two adjacent sets of rolling devices, the rolling roller of the front set of rolling device is positioned at the material inlet of the rear set of rolling device; the conveying directions of the first conveyors of the two adjacent sets of rolling devices are mutually vertical; the conveying directions of the second conveyors of the two adjacent sets of rolling devices are mutually vertical.
The equipment for preparing the electrode film further comprises a fine rolling device, wherein the fine rolling device comprises two fine rolling rollers and a conveyor;
the central axes of the two fine-rolling rollers are arranged in parallel, and the plane where the central axes of the two fine-rolling rollers are located is vertical to the horizontal plane;
two sides of a roll gap formed by the two fine rolling rolls are respectively provided with a conveyor; the input end of the conveyor at one side is a feeding port of the fine-rolling device, and the output end of the conveyor at the other side is a discharging port of the fine-rolling device;
the roll pressing roller of the M set of roll pressing device is arranged in parallel with the fine rolling roller of the fine rolling device, the plane where the central axes of the two roll pressing rollers of the M set of roll pressing device are located is parallel to the plane where the central axes of the two fine rolling rollers are located, and the middle planes of the two roll pressing rollers and the middle planes of the two fine rolling rollers are located in the same plane; the conveying direction of a second conveyor of the M set of rolling device is the same as the conveying direction of two conveyors in the fine rolling device; and the discharge port of the M sleeve rolling device is positioned at the feed port of the fine rolling device.
The invention also provides a method for producing an electrode film by using the equipment for preparing the electrode film, which comprises the following steps:
putting the mixed paste into a feeding port of a mixing device, and enabling the paste to sequentially pass through all roll gaps of the mixing device to form a continuous single-layer electrode film;
the continuous single-layer electrode film falls from a discharge port of the mixing device to a feed port of the first set of rolling device; then the continuous single-layer electrode film is folded into a continuous multi-layer electrode film through the reciprocating motion of the two rollers and the linear motion of the second conveyor, and the continuous multi-layer electrode film enters the roller gap formed by the two roller pressing rollers of the first set of rolling device from the output end of the second conveyor and is rolled into the continuous single-layer electrode film;
the continuous single-layer electrode film enters a feeding port of a rear set of rolling device after coming out from a discharge port of the front set of rolling device, then sequentially enters a next set of rolling device after passing through a folding mechanism of the rear set of rolling device, a second conveyor and a roll gap formed by two roll rollers, and so on until entering the feeding port of a fine-rolling device after passing through the roll gap formed by the M set of rolling device, and then becomes a finished electrode film after passing through the roll gap formed by the two fine-rolling rollers, and the finished electrode film is output from the discharge port of the fine-rolling device.
The invention also provides an electrode film, which is prepared by adopting the equipment or the method for preparing the electrode film.
Compared with the prior art, the invention has the beneficial effects that:
(1) the composite film formed by the invention has a cross network of fibers; and the continuous rolling is carried out according to a certain folding angle, the cross direction of the fiber is more, the anisotropy is better avoided, the interface stability among the component elements of the mixed electrode material is further obviously improved, the structural integrity is enhanced, and the electrode film is endowed with excellent mechanical strength. The equipment can ensure the uniformity of the mixed electrode material under high-temperature feeding, is safe and reliable, has low cost, greatly improves the production efficiency and the qualification rate of the battery polar plate, and obviously improves the production speed and the productivity;
(2) the invention can realize continuous film forming, and theoretically can form an electrode film with infinite length;
(3) the invention can respectively adjust the speed and the temperature of the roller so as to obtain the optimal shearing effect and the optimal rolling effect;
(4) the electrode film produced by the invention can be independently supported, has adjustable thickness, high mechanical strength and a three-dimensional interweaving network structure, is convenient for preparing a thick electrode plate with high capacity, high power and long cycle life, and can be used for lead-acid batteries, lithium ion batteries, solid lithium ion batteries, lithium capacitors, alkaline dry batteries, fuel cells, super capacitors and similar energy storage devices.
Drawings
Fig. 1 is a schematic structural view of an apparatus for preparing an electrode film according to the present invention;
FIG. 2 is a schematic structural diagram of a mixing device in an apparatus for preparing an electrode film according to the present invention;
fig. 3 is a schematic structural view of a rolling device in the apparatus for manufacturing an electrode film according to the present invention;
fig. 4 is a schematic structural view of a folding mechanism in the apparatus for manufacturing an electrode film according to the present invention;
fig. 5 is a schematic view of a folded multilayer electrode film;
FIG. 6 is a folding schematic;
FIG. 7 is a schematic view of the structure of a baffle plate in the kneading apparatus;
FIG. 8 is a schematic view of the structure of a chute in the kneading apparatus.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the present invention provides a rolling device, each set of the rolling device 200 is shown in fig. 3, and comprises: two roller pressing rollers 201, a first conveyor 202, a folding mechanism 203, and a second conveyor 204. The first conveyor 202 is located above the folding mechanism, and the second conveyor 204 is located below the folding mechanism 203, and the conveying directions of the two conveyors form an included angle, and preferably, the conveying directions of the two conveyors are perpendicular. The first conveyor and the second conveyor adopt one or two of a horizontal belt conveyor and a slope climbing belt conveyor, and the horizontal belt conveyor and the slope climbing belt conveyor can adopt various existing conveyor belt structures. The one end of two kinds of conveyer is the input, and the other end is the output, connects through the conveyer belt between input and the output, and the electrode film falls the input of conveyer, and the conveyer belt of conveyer transmits the electrode film to the output.
The first conveyor is positioned above the input end of the second conveyor, and the roller rollers are positioned at the output end of the second conveyor. The input end of the first conveyor is the feeding port of the rolling device, the output end of the second conveyor corresponds to the inlet of the roll gap formed by the two roll rollers, and the outlet of the roll gap formed by the two roll rollers is the discharging port of the rolling device.
The two roller pressing rollers 201 are temperature-adjustable rollers and run at different speeds. The two rolling rollers in the traditional rolling device are horizontally arranged, namely the central axes of the two rolling rollers are positioned in the same horizontal plane, while the two rolling rollers 201 in the invention are vertically arranged, the central axes of the two rolling rollers are parallel and positioned in the same plane vertical to the horizontal plane, thus being more convenient to be connected with a conveyor.
As shown in fig. 4, the folding mechanism 203 includes two horizontally disposed and parallel rollers, a supporting frame and a swinging mechanism, the film passes through the two rollers, and the swinging mechanism drives the two rollers to swing back and forth to form a continuous folding action. Specifically, two parallel optical bars are mounted on the support frame, and preferably, central axes of the two optical bars are located in the same horizontal plane. The two rollers are respectively sleeved on the two feed rods. The two rollers are not actively rotated and are rotated by the film. The support frame is connected with the swing mechanism. The swing mechanism can adopt various existing mechanisms capable of realizing reciprocating motion, for example, an air cylinder is adopted, the support frame is connected with a piston rod of the air cylinder to realize reciprocating motion, or a linear motor is adopted, the support frame is connected with a moving part of the linear motor, or a slide rail and a slide block are adopted, the support frame is connected with the slide block, or a belt and a synchronous toothed belt are adopted, or a screw-nut pair is adopted. The one end of two polished rods is fixed respectively on the support frame, if the rigidity of two polished rods meets the requirements, then the other end of two polished rods can be unsettled, but if the rigidity is not enough, can be connected the other end of two polished rods and a connecting plate, the connecting plate can be followed a horizontal guide reciprocating motion, for example can be on horizontal guide connecting block, the connecting plate is connected with the slider, the slider can be on horizontal guide reciprocating motion. When the swing mechanism drives the two polished rods to reciprocate, the two polished rods drive the sliding block to reciprocate on the horizontal guide rail through the connecting plate.
In each set of the rolling devices, a first conveyor 202 located above the folding mechanism is used for the transfer of the electrode films. The folding mechanism 203 is used to swing the electrode film. The conveying direction of the first conveying mechanism 202 is parallel to the velocity vector direction of the folding mechanism 203, and the linear velocities of the first conveyor 202 and the folding mechanism 203 are the same. The conveying direction of the second conveyor 204 located below the folding mechanism 203 is set perpendicular to the direction of the velocity vector of the folding mechanism 203, and the linear velocity of the second conveyor 204 is 1/n of the linear velocity of the folding mechanism, where n is the number of layers on which the folded films are overlapped. The folding mechanism 203 is matched with the conveyor to enable the electrode films which continuously run to be pulled apart by a certain angle, so that the continuous electrode films are folded by a certain angle through the compound motion formed by the first conveyor 202, the folding mechanism 203 and the second conveyor 204. Changing the speed ratio of the whole set of rolling device (namely the speed ratio among the first conveyor, the folding mechanism and the second conveyor) can realize the conversion of various folding angles alpha.
Specifically, the roll press device folds the single-layer electrode film as shown in fig. 6, and the number of layers of the single-layer electrode film fold determines the folding angle α. The folding angle α satisfies the following equation:
α＝arccos(1/n), (1)
60°≤α＜90°
n in formula (1) is the number of layers on which the folded films are stacked. Since n can only be an even number for successive folds (n must be an even number since the folding mechanism must be returned to the original position each time to effect successive folds). Except for the head and tail ends, the cross section of any folded film is n layers.
The width of the film is W, the folding length of the film is L,
L＝W/sinα (2)
the distance D of each fold is:
D＝2L/n (3)
according to this relationship, 2 layers are folded, and the folding angle is α ═ arccos (1/2) ═ 60 °; folding 4 layers, wherein the folding angle is alpha (arccos (1/4) ═ 75.52 degrees; and 6 layers are folded, and the folding angle is equal to α (arccos (1/6) ═ 80.41 degrees, and the like.
The invention also provides equipment for preparing the electrode film, which comprises a mixing device 100, an M-set rolling device 200 and a fine rolling device 300 as shown in figure 1. The fine rolling device is used for optimizing the thickness of the electrode film, and if the thickness of the electrode film from the rolling device meets the requirement, the fine rolling device is not needed.
The mixing device 100 can mix a plurality of active substance mixtures from a paste state into continuous single-layer electrode films, each set of the rolling device 200 can fold the single-layer electrode films to form continuous multi-layer composite electrode films and roll the continuous multi-layer composite electrode films into continuous single-layer electrode films, and the fine-rolling device 300 can finely roll the continuous single-layer electrode films to finished product electrode films within a certain thickness tolerance range.
As shown in fig. 2, the kneading apparatus 100 includes: a plurality of mixing rolls 101 (4 mixing rolls, respectively, a first mixing roll 1, a second mixing roll 2, a third mixing roll 3, and a 4 th mixing roll 4 in the example shown in fig. 2), a chute 102, and a baffle 105. The mixing device is used for pressing the mixture from the paste into a single-layer film capable of being folded. Some lotion only need mix a time, mixing device adopts 2 mixing rolls that set up horizontally under this condition can, some lotion need mix many times, if the number of times of mixing is few, the cream material can form discontinuous slice, some places connect promptly, some places do not connect, be the broken block, or can form continuous membrane nevertheless intensity of continuous membrane is too low, can be easy to break after the swing of two cylinders through the folding mechanism in the roll-in equipment, consequently under this condition, the cream material can form the single layer membrane that can be folded by folding mechanism that intensity accord with the requirement through mixing many times. The existing mixing device only has two mixing rolls, the paste needs to be turned over manually after passing through the mixing rolls to enter the same mixing device again for mixing, and a film meeting the requirements can be formed repeatedly, so that continuous production cannot be realized. The invention adopts a plurality of mixing rolls which are adjacent in pairs and are arranged in an S shape from top to bottom, namely a first mixing roll 1 is positioned at the upper right part (upper left part) of a second mixing roll 2, the second mixing roll 2 is positioned at the upper left part (upper right part) of a third mixing roll 3, the third mixing roll 3 is positioned at the upper right part (upper left part) of a fourth mixing roll 4, and so on, so that a first roll gap is formed between the first mixing roll 1 and the second mixing roll 2, a second roll gap is formed between the second mixing roll 2 and the third mixing roll 3, a third roll gap is formed between the third mixing roll 3 and the fourth mixing roll 4, and so on, a plurality of roll gaps are formed from top to bottom, and then the mixing for a plurality of times can be realized, the inlet of the first roll gap is the feeding port of the mixing device, and the outlet of the last roll gap is the discharging port of the mixing device.
Specifically, two adjacent mixing rolls are respectively positioned above and below the mixing roll, a plane where a central axis of the mixing roll and a central axis of the mixing roll positioned above the mixing roll are located is taken as a first plane, a plane where the central axis of the mixing roll and a central axis of the mixing roll positioned below the mixing roll are located is taken as a second plane, and the first plane and the second plane are symmetrically arranged above and below a horizontal plane where the central axis of the mixing roll is located; the included angle between the first plane and the second plane is preferably 90 degrees, so that the paste can be better ensured to smoothly pass through each roll gap under the action of gravity, and enough space for placing the bearing of each mixing roll can be ensured. Even if the roll gap between two adjacent mixing rolls is adjusted, the change of the included angle is very small because the adjusted distance is small, for example, it may become 90.01 degrees, and the two planes are still substantially perpendicular to each other.
Each mixing roll 101 is a temperature-adjustable roll, the surface temperature of each temperature-adjustable roll can be adjusted (only by using the existing temperature-adjustable roll, which is not described herein), preferably, the surface temperature can be adjusted between 0 ℃ and 350 ℃, and more preferably, the surface temperature can be adjusted between 0 ℃ and 250 ℃. The roll gap between two adjacent mixing rolls can also be independently and freely adjusted (the conventional device for adjusting the center distance between two rolls is only needed, and the detailed description is omitted). In addition, two adjacent mixing rolls are in differential operation, the speed ratio is 1.2-1.5, and no matter the speed of the upper mixing roll is high or the speed of the lower mixing roll is high, the speed of the two adjacent mixing rolls can reach the ratio, a certain differential ratio between the two adjacent mixing rolls can form corresponding shearing force, and the shearing force can pull the high molecular polymer in the paste into a fibrous shape.
In order to maintain the width of the electrode film after mixing and gather the paste, the chute 102 or the baffle 105 is arranged between two adjacent temperature-adjustable rollers. The baffle plate is used for limiting the width of feeding and discharging, and the chute is used for gathering materials from the previous roll gap and conveying the materials to the next roll gap. Can set up chute or baffle according to actual need in each roll gap department, it is preferred, set up the baffle respectively at the entrance of first roll gap, the entrance of last roll gap, the entrance at each roll gap in the middle sets up the chute respectively, like this the cream material is restricted in certain width by the baffle before getting into first roll gap, get up the cream material gathering through the chute before getting into each roll gap in the middle, the cream material is restricted in certain width by the baffle before getting into last roll gap, the width of the last ejection of compact has been guaranteed.
The mixing process comprises the following steps: the paste 104 is continuously fed into the first nip, and after being rolled by a plurality of pairs of kneading rolls 101, the paste is rolled into a continuous single-layer electrode film 103.
The structure of the baffle is shown in fig. 7, and comprises two vertical plates perpendicular to the central axis of the mixing roll, one side edge of each vertical plate is an arc-shaped edge, the arc-shaped edge is attached to the outer wall of the upper mixing roll (the attachment in the invention does not mean that the vertical plates are connected into a whole, but means that the arc degrees of the vertical plates are basically consistent and are as close as possible, and the gap between the vertical plates is narrow, so that the rotation of the mixing roll is not influenced, and the paste cannot leak from the gap between the vertical plates as much as possible), the bottom edge of each vertical plate is an arc-shaped edge, the arc-shaped edge is attached to the outer wall of the lower mixing roll, and the intersection point of the two arc-shaped edges of each vertical plate is tightly attached to the inlet of the gap formed by the upper mixing roll and the lower mixing roll.
The chute is structurally shown in fig. 8, the cross section of the chute is in a V shape with an arc bottom, the chute comprises a left side plate, an arc plate and a right side plate which are sequentially and smoothly connected, planes where the left side plate and the right side plate are respectively located are intersected to form a certain angle, the angle is an opening angle of the V shape, and the chute can be designed according to the actual condition of the paste. The left side limit of left side board is the arc limit, and this arc limit is laminated with the mixing roll's of top outer wall, the right side limit of left side board is connected with the left side limit of arc. The left side edge of the right side plate is connected with the right side edge of the arc-shaped plate, the right side edge of the right side plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the upper mixing roll; the top edge of the left side plate, the top edge of the arc-shaped plate and the top edge of the right side plate are connected to form the top edge of the chute, and the top edge of the chute is in a V shape with an arc-shaped bottom; the bottom edge of the left side plate, the bottom edge of the arc-shaped plate and the bottom edge of the right side plate are connected to form the bottom edge of the chute, the bottom edge of the chute is in a V shape with an arc-shaped bottom, and meanwhile, the bottom edge is attached to the outer wall of the mixing roll below. The intersection point of the left side edge and the bottom edge of the left side plate is closely attached to the roll gap formed by the upper mixing roll and the lower mixing roll, and the intersection point of the right side edge and the bottom edge of the right side plate is closely attached to the roll gap formed by the upper mixing roll and the lower mixing roll.
The number of the mixing rolls 101 and the surface temperature are determined according to the properties of the paste. In practical use, the times and the surface temperature of mixing required for forming a single-layer film by a certain paste can be determined by experiments, the number of required roll gaps can be determined according to the mixing times, and as two mixing rolls form one roll gap, the number of required mixing rolls can be determined according to the number of the roll gaps, and then the temperature-adjustable roll capable of achieving the required surface temperature is selected.
The mixing apparatus 100 further includes a frame, a driving member, and the like, which are the same as those of the conventional mixing apparatus, and thus, will not be described in detail herein. The baffle plate in the existing mixing device is arranged on a cross bar and can reciprocate along the cross bar, so that the baffle plate can be conveniently moved when the roll gap is adjusted. The invention also discloses a method for preparing the mixing roll, which comprises the steps of respectively installing a baffle plate and a chute on the corresponding transverse bars, installing each transverse bar on a frame, and enabling the baffle plate and the chute to reciprocate on the corresponding transverse bars.
The invention adopts a plurality of sets of rolling devices to realize the continuous production of the electrode film. In the multiple sets of rolling devices, the conveying direction of the first conveyor in two adjacent sets of rolling devices is vertical. In actual use, the single-layer electrode film 103 output by the mixing device 100 falls onto a first conveyor of a first set of rolling devices (in fig. 3, the part of the single-layer electrode film 103 falling onto the first conveyor is denoted as 205), the first conveyor 202 conveys the single-layer electrode film to a folding mechanism 203, the single-layer electrode film 205 is swung back and forth by a roller, a second conveyor 204 is matched for forward conveying, so that the single-layer electrode film 205 is pulled to a certain angle and is continuously conveyed forward to form a folded multilayer electrode film 206 (as shown in fig. 5, the multilayer electrode film 206 in fig. 5 comprises four layers of films), the multilayer electrode film 206 is rolled by a rolling roller of the first set of rolling devices to become a single-layer electrode film again, the single-layer electrode film is input onto the first conveyor of the second set of rolling devices, and continuously passes through the folding mechanism, the second conveyor and the rolling roller of the second set of rolling devices to enter the next set of rolling devices, by repeating this process, the network of fibers formed in the film by roll shearing becomes a cross-plied multilayer network. Each set of rolling device is folded for 1 time, and the M sets of rolling devices are folded for M times, so that:
total number of layers n M (4)
M, n are all natural numbers.
Such a multilayered intersecting network of fibers can effectively encapsulate the active material and the conductive material. The continuous production can be realized by the equipment of the invention, and an electrode film with infinite length can be theoretically prepared. In the traditional process, 3 folds are folded and then turned 90 degrees, the fibers of all layers are parallel to each other in the 3 folds, the fibers formed by rolling and shearing again are perpendicular to the fibers after turning 90 degrees, and the fibers form a cross network, but the 90-degree folding mode cannot produce a continuous film. The invention adopts continuous rolling with folding angle, namely, the folding method of more than or equal to 60 degrees and less than 90 degrees is adopted for continuous rolling, the formed fiber is not crossed, the crossing angle of the fiber between layers after folding is the residual angle of 2 times of the folding angle alpha, namely the crossing angle is pi-2 alpha, the angle between the fiber formed after rolling and shearing and the fiber formed by last rolling and shearing is the folding angle alpha, thus realizing fiber crossing and continuous production, and the repeated cross folding also obviously improves the interface stability between the component elements of the mixed electrode material, enhances the structural integrity and endows the electrode film with excellent mechanical strength.
Since each set of rolling devices needs a height difference from the first conveyor to the second conveyor, the types of the conveyor belts of the first conveyor and the second conveyor are selected according to actual production conditions, for example, if the rolling devices are arranged at different heights, the first conveyor and the second conveyor can both adopt horizontal conveyors. If the rolling devices are arranged at the same height, the first conveyor adopts a slope climbing belt conveyor, the second conveyor adopts a horizontal conveyor, or the first conveyor adopts the horizontal conveyor 202, the second conveyor adopts the horizontal conveyor and the slope climbing belt conveyor, the two conveyors are close to each other and form continuous conveying in the conveying direction. If the slope of the climbing belt conveyor is small but meets the requirement of height difference, and the slope does not affect the folding effect, the climbing belt conveyor can be arranged directly below the folding mechanism.
The fine rolling device 300 comprises two fine rolling rollers and conveyors arranged at two sides of a roller gap formed by the two fine rolling rollers; the two precision-rolling rollers run at a constant speed, the central axes of the two precision-rolling rollers are arranged in parallel, and the plane where the central axes of the two precision-rolling rollers are located is vertical to the horizontal plane. The conveyors positioned at two sides of a roll gap formed by the two fine-rolling rollers are horizontal conveyors, the input end of the conveyor close to one side of the rolling device is a feeding port of the fine-rolling device, and the output end of the conveyor at the other side is a discharging port of the fine-rolling device.
In one set of equipment, the central axis of each mixing roll of the mixing device is perpendicular to the central axis of each roll roller of the first set of roll-in device, the central axes of the roll rollers of the two adjacent roll-in devices are perpendicular, the roll roller of the Mth set of roll-in device is parallel to the central axis of the fine-extending roll of the fine-extending device, the plane where the central axes of the two roll rollers are located is parallel to the plane where the central axes of the two fine-extending rolls are located, and the midplane of the two roll rollers (the midplane is a plane perpendicular to the axial direction of the rolls, and the axial midpoint of the rolls is located in the plane) and the midplanes of the two fine-extending rolls are located on the same plane, so that the electrode film can be located in the middle parts of the roll rollers and the fine-extending rolls. The conveying direction of the second conveyor of the M-th set of rolling device is the same as the conveying direction of the two conveyors in the fine rolling device. The single-layer film coming out of the roll gap of the roll rollers of the last set of rolling device is conveyed into the roll gap formed by the two fine rolling rollers through the conveyor at one side of the roll gap of the two fine rolling rollers, and the single-layer film coming out of the roll gap formed by the two fine rolling rollers is output through the conveyor at the other side.
In order to meet the performance and capacity requirements of electrode films at different angles, the speed of each roller, the conveyor and the folding mechanism in the mixing device, the rolling device and the precision-stretching device can be adjusted, the speed is accurately matched, and continuous production is guaranteed.
One embodiment of the invention is as follows:
the mixing device adopts 4 mixing rolls with the size of phi 300x600, two adjacent mixing rolls are arranged at 45 degrees, and 4 mixing rolls form an S-shaped layout (as shown in figure 2). The linear velocities of the first kneading roll 1 and the third kneading roll 3 were 7.87m/min, and the linear velocities of the second kneading roll 2 and the fourth kneading roll 4 were 10 m/min. The upper parts of the first mixing roll 1 and the second mixing roll 2 are feed inlets, the lower parts of the third mixing roll 3 and the fourth mixing roll 4 are discharge outlets, a first roll gap is formed between the first mixing roll 1 and the second mixing roll 2, a second roll gap is formed between the second mixing roll 2 and the third mixing roll 3, and a third roll gap is formed between the third mixing roll 3 and the fourth mixing roll 4.
At the inlet of the first nip a baffle 105 is arranged to control the flow of paste 104 into the mixing apparatus. A chute 102 is arranged at the inlet of the second roll gap, and the paste coming out of the first roll gap is gathered and then is input into the second roll gap. And a baffle is arranged at the inlet of the third roll gap to limit the width of the paste entering the third roll gap. The adjacent roll gap is 0.8 mm. A set of rolling device 200 is connected under the discharge ports at the lower parts of the third mixing roll 3 and the fourth mixing roll 4. The spacing between the two vertical plates of the baffle 105 in the mixing device 100 is 270 mm.
The rolling device 200 includes: a 500X500 horizontal belt conveyor (as a first conveyor 202), a set of folding mechanism 203 (speed is 10m/min), a slope climbing belt conveyor (as a second conveyor 204), and rolling rollers 201, wherein the sizes of the two rolling rollers 201 are phi 300X600, the speed ratio of the two rolling rollers 201 is 1:1.27, the surface linear speeds of the two rolling rollers 201 are 10m/min and 7.87m/min respectively, the surface temperature of the rolling rollers is 30 ℃, and the roller gap is 0.8 mm.
The folding mechanism 203 in the rolling device 200 comprises a pair of rollers with the diameter of 50mmX600mm, a support frame and a swinging mechanism, wherein two parallel light bars with the diameter of 25mmX700mm are arranged on one side of the support frame, the two rollers are respectively sleeved on the two light bars, and the other ends of the two light bars in the embodiment are connected with a connecting plate. The swing mechanism in this embodiment adopts a screw-nut pair structure, specifically, the opposite side of the support frame is connected with a screw nut, the screw nut is matched with a ball screw of phi 25mmX800mm, the ball screw rotates to drive the screw nut to reciprocate, the screw nut drives the support frame to reciprocate, and the support frame further drives two rollers to reciprocate through a feed rod. The distance between the two rollers can be fixed or can be designed to be adjustable. In the embodiment, the roll gap of the roll device is adjustable from 0mm to 10mm, and the distance between two rollers in the folding mechanism is set to be 10 mm.
The surface temperature of the mixing roll and the roll press roll in the present embodiment is 20 to 50 degrees, preferably 25 to 40 degrees, and more preferably 30 degrees. The roll gap of the mixing roll and the roll pressing roll is 0.5-1.5mm, preferably 0.8-1.2 mm. The width of the conveyor is 300mm-1000mm, preferably 400-800mm, more preferably 500-600 mm. The conveying speed of the conveyor is 1-6 m/min.
The number of the rolling devices is determined according to the properties of the electrode film, namely, the ideal PDFE fiber network structure can be formed after several rolling times according to the properties of the electrode film. In this example, three sets of rolling devices were used.
The number of folds to be folded depends on the speed of the ramp-up belt conveyor below the folding device, which is the same as the folding mechanism 203, and the conveying speed of the ramp-up belt conveyor is 1/n of the folding mechanism 203 (if there is a horizontal belt conveyor connected to the ramp-up belt conveyor, the conveying speed is also 1/n of the folding mechanism 203). Two speeds were tested using the above apparatus and the results were as follows: 5.77m/min formed 2 folded films, 2.89m/min formed 4 folded films.
The tests carried out with the apparatus of this example were as follows:
fully mixing an active substance, a conductive agent, a pore-forming agent and a PDFE (Poly tetra fluoro ethylene) aqueous solution to form a paste material, putting the mixed paste material between a first mixing roller 1 and a second mixing roller 2 of a mixing device (as shown in figure 2), passing through a first roll gap and a chute, entering a second roll gap, passing through a baffle plate between the second mixing roller 2 and a third mixing roller 3, entering a third roll gap (namely, passing through three times of mixing, wherein the mixing times of different formulas are possibly different, and the number of the corresponding mixing rollers is designed according to requirements), falling onto a horizontal belt conveyor of a first set of rolling device, passing through a folding mechanism 203 of the first set of rolling device, a climbing belt conveyor and a rolling roller 201, entering a horizontal belt conveyor of a second set of rolling device, passing through a folding mechanism 203 of the second set of rolling device, the climbing belt conveyor, The rolled rolls enter a horizontal belt conveyor of a third set of rolling device, and are conveyed to a fine-rolling device 300 through a folding mechanism 203 of the third set of rolling device, a climbing belt conveyor and a rolling roll 201 by the horizontal belt conveyor. After 3 times of kneading and 3 times of folding and rolling, an active material single-layer electrode film having a cross PDFT fiber network was formed.
The test results are as follows:
in the above manner, the effects of the roller speed, the number of folded layers, the roller speed ratio of the two rollers in each pair of rollers, and the different roll gaps on the performance of the formed active material single-layer electrode film were examined. The maximum speed for producing the electrode film reaches 30 m/min; the maximum number of folding layers is 6, and the roll gap is 0.8mm, 1.5mm and 2 mm; the roller speed ratio is tested by 1.2-1.5. Test results show that the roller speed is increased, the production speed is accelerated, and the influence on the final film forming quality and performance is small; the number of folded layers increases, and the strength of the final film increases.
The electrode film which has the advantages of complete integral structure, independent support, adjustable thickness, high mechanical strength, high stability, compact interface among different material component particles and a three-dimensional interweaving network structure is prepared by the equipment, and the prepared electrode film can be compatible with a water system and an organic polymer binder. The shape and size of the electrode film can be regulated, the thickness of the electrode film can be regulated to 0.5-5 mm, and the quality and the volume energy density of the electrochemical energy storage device are further improved. Compared with the electrode materials prepared by the three methods in the prior art, the electrode materials are required to be blade-coated or deposited on a current collector in the form of liquid or dry powder, the electrochemical energy storage device prepared by the electrode film produced by the equipment has higher energy density, volume density and long cycle life, and is suitable for manufacturing anode active substance films and cathode active substance films of various electrochemical energy storage batteries, including lead-acid batteries, super batteries based on lead-acid systems, lithium ion batteries, solid lithium ion batteries, lithium capacitors, alkaline dry batteries, fuel batteries, super capacitors and anode and cathode active substance films of nickel-hydrogen batteries.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.

Claims (8)

1. An apparatus for producing an electrode film, characterized in that: comprises a mixing device and an M-sleeve rolling device; m is a natural number greater than 1;
the mixing device corresponds to a feeding port of a first set of rolling device, a discharging port of the first set of rolling device corresponds to a feeding port of a second set of rolling device, a discharging port of the second set of rolling device corresponds to a feeding port of a third set of rolling device, and so on, a discharging port of an M-1 set of rolling device corresponds to a feeding port of an M-1 set of rolling device;
the rolling device includes: the folding device comprises a first conveyor, a folding mechanism, a second conveyor and a roller;
the first conveyor and the second conveyor respectively comprise an input end and an output end, and the input end and the output end are connected through a conveyor belt;
the input end of the first conveyor is a feeding port of the rolling device; the output end of the first conveyor is positioned above the input end of the second conveyor;
the output end of the second conveyor corresponds to the inlet of a roll gap formed by the two roll rollers, and the outlet of the roll gap formed by the two roll rollers is the discharge hole of the roll pressing device;
the folding mechanism comprises two rollers which are arranged in parallel, and the two rollers can reciprocate in the horizontal plane simultaneously;
the two rollers of the folding mechanism are arranged below the output end of the first conveyor and above the input end of the second conveyor;
the central axes of the two rolling rollers of the rolling device are arranged in parallel, and the plane where the two central axes are located is vertical to the horizontal plane;
the central axes of the two rollers in the folding mechanism are vertical to the conveying direction of the first conveyor; the moving directions of the two rollers are parallel to the conveying direction of the first conveyor;
the conveying direction of the first conveyor is vertical to the conveying direction of the second conveyor;
the reciprocating motion of the two rollers and the linear motion of the second conveyor enable the continuous single-layer electrode film to be folded into a continuous multi-layer electrode film;
the folding mechanism is matched with the second conveyor, so that the electrode films which continuously run can be pulled away by a certain angle, and the continuous electrode films can be folded by a certain angle.
2. The apparatus for preparing an electrode film according to claim 1, characterized in that: the folding mechanism further comprises a supporting plate and a swinging mechanism;
two parallel light bars are fixedly arranged on one side of the supporting plate, and the central axes of the two light bars are positioned in the same horizontal plane; the two rollers are respectively sleeved on the two feed rods; the other side of the supporting plate is connected with the swinging mechanism, and the swinging mechanism can drive the supporting plate to reciprocate;
one ends of the two feed rods are fixed on the supporting plate, and the other ends of the two feed rods are free ends or are connected with the connecting plate; the connecting plate is connected with a sliding block, and the sliding block can reciprocate along the horizontal guide rail.
3. The apparatus for preparing an electrode film according to claim 2, characterized in that: the first conveyor and the second conveyor adopt one or two of a horizontal belt conveyor and a slope climbing belt conveyor;
the moving speeds of the first conveyor and the folding mechanism are the same, and the linear speed of the second conveyor is 1/n of the linear speed of the first conveyor;
n is the number of layers of the single-layer electrode film folded on the second conveyor.
4. The apparatus for preparing an electrode film according to claim 3, characterized in that: the mixing device comprises: at least 2 mixing rolls, chutes and baffles;
the central axes of all the mixing rolls are arranged in parallel;
if the number of the mixing rolls is more than 2, all the mixing rolls are arranged in an S shape from top to bottom; the two adjacent mixing rolls form a roll gap; the inlet of the uppermost roll gap is a feeding port of the mixing device, and the outlet of the lowermost roll gap is a discharging port of the mixing device;
the baffle plates are respectively arranged at the inlet of the uppermost roll gap and the inlet of the lowermost roll gap; the chutes are respectively arranged at the inlets of the middle roll gaps;
two mixing rolls adjacent to the same mixing roll are respectively positioned above and below the mixing roll; taking a plane on which the central axis of the mixing roll and the central axis of the mixing roll positioned above the mixing roll are positioned as a first plane, taking a plane on which the central axis of the mixing roll and the central axis of the mixing roll positioned below the mixing roll are positioned as a second plane, and symmetrically arranging the first plane and the second plane above and below a horizontal plane on which the central axis of the mixing roll is positioned;
the baffle comprises two vertical plates vertical to the central axis of the mixing roll; one side edge of each vertical plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the upper mixing roll; the bottom edge of each vertical plate is an arc-shaped edge, and the arc-shaped edge is attached to the outer wall of the mixing roll below; the intersection point of two arc edges of each vertical plate is tightly attached to the inlet of a roll gap formed by the upper mixing roll and the lower mixing roll;
the chute comprises a left side plate, an arc-shaped plate and a right side plate which are connected in sequence and smoothly; the left side edge of the left side plate is an arc-shaped edge, the arc-shaped edge is attached to the outer wall of the upper mixing roll, and the right side edge of the left side plate is connected with the left side edge of the arc-shaped plate; the left side edge of the right side plate is connected with the right side edge of the arc-shaped plate, the right side edge of the right side plate is an arc-shaped edge, and the right side edge of the right side plate is attached to the outer wall of the upper mixing roll; the top edge of the left side plate, the top edge of the arc-shaped plate and the top edge of the right side plate are connected to form the top edge of the chute, and the top edge of the chute is in a V shape with an arc-shaped bottom; the bottom edge of the left side plate, the bottom edge of the arc-shaped plate and the bottom edge of the right side plate are connected to form the bottom edge of the chute, the bottom edge of the chute is in a V shape with an arc-shaped bottom, and meanwhile, the bottom edge of the chute is attached to the outer wall of the mixing roll below the chute; the intersection point of the left side edge and the bottom edge of the left side plate is tightly attached to a roll gap formed by the upper mixing roll and the lower mixing roll; and the intersection point of the right side edge and the bottom edge of the right side plate is closely attached to a roll gap formed by the upper mixing roll and the lower mixing roll.
5. The apparatus for preparing an electrode film according to claim 4, characterized in that: the discharge port of the mixing device is positioned above the feed port of the first set of rolling devices; the central axis of the mixing roll of the mixing device is vertical to the central axis of the roll of the first set of rolling device;
the central axes of the rolling rollers of two adjacent sets of rolling devices are vertical;
in the two adjacent sets of rolling devices, the rolling roller of the front set of rolling device is positioned at the material inlet of the rear set of rolling device; the conveying directions of the first conveyors of the two adjacent sets of rolling devices are mutually vertical; the conveying directions of the second conveyors of the two adjacent sets of rolling devices are mutually vertical.
6. The apparatus for preparing an electrode film according to any one of claims 1 to 5, characterized in that: the equipment for preparing the electrode film further comprises a fine rolling device, wherein the fine rolling device comprises two fine rolling rollers and a conveyor;
the central axes of the two fine-rolling rollers are arranged in parallel, and the plane where the central axes of the two fine-rolling rollers are located is vertical to the horizontal plane;
two sides of a roll gap formed by the two fine rolling rolls are respectively provided with a conveyor; the input end of the conveyor at one side is a feeding port of the fine-rolling device, and the output end of the conveyor at the other side is a discharging port of the fine-rolling device;
the roll pressing roller of the M set of roll pressing device is arranged in parallel with the fine rolling roller of the fine rolling device, the plane where the central axes of the two roll pressing rollers of the M set of roll pressing device are located is parallel to the plane where the central axes of the two fine rolling rollers are located, the middle planes of the two roll pressing rollers and the middle planes of the two fine rolling rollers are located in the same plane, the middle plane is a plane which is vertical to the axial direction of the roll, and the middle point of the roll in the axial direction is located in the plane; the conveying direction of a second conveyor of the M set of rolling device is the same as the conveying direction of two conveyors in the fine rolling device; and the discharge port of the M sleeve rolling device is positioned at the feed port of the fine rolling device.
7. A method for producing an electrode film using the apparatus for producing an electrode film according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
putting the mixed paste into a feeding port of a mixing device, and enabling the paste to sequentially pass through all roll gaps of the mixing device to form a continuous single-layer electrode film;
the continuous single-layer electrode film falls from a discharge port of the mixing device to a feed port of the first set of rolling device; then the continuous single-layer electrode film is folded into a continuous multi-layer electrode film through the reciprocating motion of the two rollers and the linear motion of the second conveyor, and the continuous multi-layer electrode film enters the roller gap formed by the two roller pressing rollers of the first set of rolling device from the output end of the second conveyor and is rolled into the continuous single-layer electrode film;
the continuous single-layer electrode film enters a feeding port of a rear set of rolling device after coming out from a discharge port of the front set of rolling device, then sequentially enters a next set of rolling device after passing through a folding mechanism of the rear set of rolling device, a second conveyor and a roll gap formed by two roll rollers, and so on until entering the feeding port of a fine-rolling device after passing through the roll gap formed by the M set of rolling device, and then becomes a finished electrode film after passing through the roll gap formed by the two fine-rolling rollers, and the finished electrode film is output from the discharge port of the fine-rolling device.
8. An electrode film prepared according to the apparatus of any one of claims 1 to 6 or the method of claim 7.
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