CN114558741A

CN114558741A - New energy automobile lithium battery pole piece coating equipment

Info

Publication number: CN114558741A
Application number: CN202210196507.3A
Authority: CN
Inventors: 刘振添
Original assignee: Guangzhou Pantai Energy Technology Co ltd
Current assignee: Guangzhou Pantai Energy Technology Co ltd
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-05-31
Anticipated expiration: 2042-03-02
Also published as: CN114558741B

Abstract

The invention belongs to the technical field of new energy automobile batteries, and particularly relates to new energy automobile lithium battery pole piece coating equipment which comprises a supporting frame, an unreeling mechanism, a tensioning mechanism, a guide mechanism, a coating mechanism, a drying mechanism, a cold pressing mechanism, a reeling mechanism and a pressing crease-resistant mechanism; according to the invention, the tensioning mechanism drives the driving rod to move in the process of adjusting the tensioning force motion, so that the driving rod drives the oscillating rod to rotate around the fixing seat, the oscillating rod drives the pressing rod to move, the pressing rod drives the pressing roller to move on the surface of the back roll, and the spring is arranged between the pressing rod and the oscillating rod, so that the spring stretches to enable the current collector to be pressed on the back roll by the pressing roller all the time, and further the current collector is prevented from wrinkling, so that the current collector is ensured to be flat and tightly attached to the back roll when passing through the surface of the back roll, the condition that the coating is uneven when slurry is coated on the surface of the current collector is avoided, and further the uniformity of the coating of the slurry on the surface of the current collector is ensured.

Description

New energy automobile lithium battery pole piece coating equipment

Technical Field

The invention belongs to the technical field of new energy automobile batteries, and particularly relates to a new energy automobile lithium battery pole piece coating device.

Background

A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode; during the charge and discharge process, lithium ions are intercalated and deintercalated between the two electrodes: during charging, lithium ions are extracted from the positive electrode and are inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging; the production and manufacturing of the lithium ion battery are closely connected processes by process steps; in general, the production of the lithium battery comprises a pole piece manufacturing process, a battery assembly process and a final liquid injection, pre-charging, formation and aging process; in the three-stage process, each procedure can be divided into a plurality of key processes, each step can greatly influence the final performance of the battery, the pole piece manufacturing procedure is the core content of the whole lithium battery manufacturing and is related to the electrochemical performance of the battery, and the quality of the slurry is particularly important;

coating process has important influence to lithium ion battery performance in the pole piece manufacturing procedure, and the coating is that the thick liquids with stirring is evenly coated on the mass flow body to a technology of drying the organic solvent in the thick liquids, guarantee that the even coating of pole piece has important influence to battery capacity, internal resistance, cycle life and security, have the requirement to the tensioning of mass flow body when the coating, but the untimely fold appears when can make the mass flow body pass through the backing roll when the tensioning is adjusted, and then influence the homogeneity of coating.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a new energy automobile lithium battery pole piece coating device. The invention is mainly used for solving the problem that the current collector is wrinkled when passing through a back roll due to the change of the tension force when the current collector is tensioned and adjusted by the existing coating equipment, so that the coating uniformity is influenced.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention provides a new energy automobile lithium battery pole piece coating device which comprises a supporting frame, an unreeling mechanism, a tensioning mechanism, a guide mechanism, a coating mechanism, a drying mechanism, a cold pressing mechanism and a reeling mechanism, wherein the unreeling mechanism is arranged on the supporting frame; the supporting frame is fixedly connected to the ground; the unwinding mechanism is arranged at one end of the supporting frame; the unwinding mechanism is used for unwinding the coiled current collector; the other end of the supporting frame is provided with the winding mechanism; the rolling mechanism is used for rolling the compacted battery grade sheet;

the coating mechanism is arranged behind the unwinding mechanism and used for coating slurry on the surface of the discharged current collector; the coating mechanism comprises a back roll, a coating roll, a slurry scraper and a slurry box; the bracket is rotatably connected with the coating roller; the back roll is arranged on one side of the coating roll; the other side of the coating roller is provided with the slurry box; the slurry box is fixedly connected to the supporting frame; the slurry scraper is arranged above the coating roller;

the drying mechanism is arranged behind the coating mechanism and used for drying the current collector coated with the slurry;

the cold pressing mechanism is arranged behind the drying mechanism and used for compacting the dried battery grade sheet;

the rolling mechanism is arranged behind the cold pressing mechanism and used for rolling the compacted battery grade sheet;

the tensioning mechanism is arranged between the unreeling mechanism and the coating mechanism; the tensioning mechanism is used for controlling the tensioning force of the current collector in the discharging process;

the guide mechanism is arranged between the unwinding mechanism and the winding mechanism; the guide mechanism comprises an uncoiling guide roller, a coating guide roller and a coiling guide roller; an uncoiling guide roller is arranged between the tensioning mechanism and the uncoiling mechanism; the uncoiling guide roller is rotationally connected to the supporting frame; a coating guide roller is arranged between the adjusting mechanism and the coating mechanism; the coating guide roller is connected to the supporting frame; the coiling guide roller is arranged between the coiling mechanism and the cold pressing mechanism; the coiling guide roller is rotationally connected to the supporting frame; the coating equipment also comprises a pressing crease-resist mechanism; the pressing crease-resistance mechanism comprises a fixed seat, an oscillating rod, a pressing roller, a driving rod and a spring; the pressing roller is arranged below the coating roller and the back roller and is in contact with the back roller; the two ends of the rotating shaft of the pressing roller are provided with the pressing rods; one end of the pressing rod is rotatably connected to a rotating shaft of the pressing roller; the other end of the pressing rod is provided with the swinging rod; the other end of the pressing rod is rotatably connected to one end of the swinging rod; the other end of the swinging rod is provided with the driving rod; one end of the driving rod is rotatably connected to the other end of the swinging rod; the other end of the driving rod is connected to the tensioning mechanism; the middle part of the swing rod is rotatably connected to the supporting seat; the supporting seat is fixedly connected to the cross bar of the supporting frame; the spring is arranged between one end of the swinging rod close to the driving rod and one end of the pressing rod close to the pressing roller; and two ends of the spring are fixedly connected to the swinging rod and the pressing rod.

When the current collector works, slurry is continuously or intermittently and uniformly coated on the surface of a transmission current collector according to different lithium ion battery core manufacturing processes during lithium battery production, the current collector is in a roll shape, after the current collector is unfolded, a compacted battery grade sheet is wound into a roll and then stored and transported after the compacted battery grade sheet sequentially passes through an uncoiling guide roller, a tensioning mechanism, a coating guide roller, a coating mechanism, a drying mechanism and a cold pressing mechanism, so that the current collector is continuously and uninterruptedly transmitted in the coating process, the diameter of the rolled current collector is continuously reduced in the process of producing the battery grade sheet, the tensioning force of the current collector in the transmission process is continuously changed, the tensioning force of the current collector is controlled through the tensioning mechanism, the current collector is in a stable state, when the tensioning force is changed, the tensioning mechanism is moved and adjusted, and the interaction force of the contact surface of the current collector and a back roller in the process is changed (the tightness degree of contact between the current collector and the back roller is changed Change), and further wrinkles appear on the current collector near the back roll, and further influences the uniformity of slurry coating on the surface of the current collector, and further influences the performance consistency of battery grade sheets, so that the tensioning mechanism drives the driving rod to move in the process of adjusting the tensioning force motion, and further the driving rod drives the swinging rod to rotate around the fixed seat, and further the swinging rod drives the pressing rod to move, and further the pressing rod drives the pressing roller to move on the surface of the back roll (the pressing roller moves between the contact tangent point of the current collector and the back roll and the nearest distance between the coating roller and the back roll), and because the spring is arranged between the pressing rod and the swinging rod, the spring is stretched, so that the current collector is always pressed on the back roll by the pressing roller, and further avoids the wrinkles caused by too loose between the back roll and the current collector due to untimely adjustment of the tensioning mechanism when the tensioning force of the current collector between the coating mechanism and the unwinding mechanism is changed because the diameter of the coiled current collector is continuously reduced, the current collector is ensured to be flat and tightly attached to the back roll when passing through the surface of the back roll, so that the condition that the slurry is coated on the surface of the current collector to cause uneven coating is avoided, the uniformity of the slurry coated on the surface of the current collector is further ensured, and the performance consistency of the battery grade sheet is further ensured; meanwhile, the compression roller moves along with the movement of the tensioning mechanism, so that the pressure between the compression roller and the back roller is relatively stable, the surface tension of the current collector is greater than that of the coating solution, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade sheet is improved, and the quality of a lithium battery is improved; the compression roller avoids the contact between the coating surface of the current collector and the coating roller when the tension force of the current collector changes, and further avoids the coating roller from scratching the surface of the coating slurry of the current collector, and further ensures the quality of the battery grade sheet.

Preferably, the tensioning mechanism comprises a tensioning roller, a connecting rod, a rotating shaft, a supporting seat, a first worm wheel, a first worm and a motor; the other end of the driving rod is rotatably connected to a rotating shaft of the tension roller; the supporting seat is fixedly connected to the ground; the support seat is rotatably connected with the rotating shaft; the middle part of the rotating shaft is fixedly connected with the first worm wheel; the first worm is in meshed transmission with the first worm wheel; the first worm is rotationally connected to the supporting seat; one end of the first worm is fixedly connected to a rotating shaft of the motor; the mounting seat of the motor is fixedly connected to the supporting seat; the two ends of the rotating shaft are provided with the connecting rods; one end of the connecting rod is fixedly connected to the rotating shaft; the other end of the connecting rod is rotatably connected to a rotating shaft of the tensioning roller; a flexible layer is arranged on the tooth surface of the first worm.

When the current collector tensioning device works, when the tensioning force of a driven current collector changes, the first worm is driven to rotate through the motor, the first worm drives the turbine to rotate, the turbine drives the rotating shaft to rotate, the rotating shaft drives the connecting rod to swing, the connecting rod drives the tensioning roller to move, and the tensioning force of the current collector is adjusted; and because the tooth surface of the first worm is provided with the flexible layer, when the motor is started to drive the turbine to rotate, the flexible layer plays a role in buffering, so that the impact force generated when the motor is started is avoided from swinging the connecting rod, the influence on the tension of a current collector is avoided, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade piece is improved, and the quality of a lithium battery is improved.

Preferably, two ends of the rotating shaft of the coating guide roller are respectively connected to the cross bar of the supporting frame through a first electric push rod and a second electric push rod; the cylinder bodies of the first electric push rod and the second electric push rod are fixedly connected to the supporting frame; the first connector at the end part of the extending end of the first electric push rod is rotatably connected to the rotating shaft of the coating guide roller; a first pressure sensor is arranged between the first connector and the guide rod of the first electric push rod; a second connector at the end part of the extending end of the second electric push rod is rotatably connected to a rotating shaft of the coating guide roller; a second pressure sensor is arranged between the second connector and the guide rod of the second electric push rod.

When the device works, a current collector is unwound from an unwinding mechanism and enters a coating mechanism by bypassing a coating guide roller after passing through a tensioning mechanism, if the current collector is stressed on two sides of the current collector to deviate when passing through the coating guide roller, the current collector is enabled to have wrinkles, and further the current collector in a wrinkle state enters the coating mechanism, so that slurry is unevenly distributed on the current collector, therefore, a first electric push rod and a second electric push rod are respectively arranged at two ends of a rotating shaft of the coating guide roller, a first pressure sensor is arranged between a guide rod of the first electric push rod and a first connector, a second pressure sensor is arranged between a guide rod of the second electric push rod and a second connector, when the current collector passes through the coating guide roller, the first pressure sensor and the second pressure sensor respectively measure pressure values on two sides of the current collector (the pressure value measured by the first pressure sensor is P1, and the pressure value measured by the second sensor is P2), the first sensor sends P1 and the second sensor sends P2 to a temporary storage element in the controller, a calculation element in the controller is controlled to calculate difference values between P1 and P2 in the temporary storage unit and a pressure value set in the controller (the pressure value set in the controller is recorded as Pe), if the difference value between P1 and Pe is a positive value (recorded as Pz1), the calculation element in the controller calculates a distance (recorded as Sz1) needing to be moved according to Pz1, further the first electric push rod is controlled by the controller to retract the Sz1 distance, if the difference value between P1 and Pe is a negative value (recorded as Pf1), the calculation element in the controller calculates a distance (recorded as Sf1) needing to be moved according to Pf1, further the controller controls the first electric push rod to extend the Sf1 distance, the last sensor sends P1 to the controller for repeated calculation, and when the difference value between P1 and P2 is 0, after the interval is set, a round of calculation is carried out, P2 measured by the second sensor and the first sensor carry out the same calculation and contrast controller to control the retraction or the extension of the second electric push rod, and then when the values of the first sensor and the second sensor deviate from the set pressure values, the pressure values received by the two sides of the current collector are automatically adjusted through the extension or the retraction of the first electric push rod and the second electric push rod, so that the current collector is prevented from wrinkling due to uneven stress on the two sides of the current collector, the surface smoothness of the current collector passing through a coating mechanism is further ensured, the uniform and smooth coating of slurry on the surface of the current collector is further ensured, the coating quality is further improved, the quality of a battery grade sheet is further improved, and the quality of a lithium battery is further improved; meanwhile, the tensioning mechanism can automatically adjust the tensioning wheel according to the numerical values of the first pressure sensor and the second pressure sensor to control the tensioning degree of the current collector.

Preferably, a leveling scraper is arranged above the back roll; flexible baffles are arranged at two ends of a coating area formed among the back roll, the coating roll, the slurry scraper and the leveling scraper; the flexible baffle is fixedly connected to the support frame through a support; a channel is arranged at the edge of the flexible baffle plate, which contacts the back roller and the coating roller; a compression rope is arranged in the channel; two ends of the pressing rope are respectively and fixedly connected to the side wall of the flexible baffle close to one side of the leveling scraper and one side of the slurry scraper; the middle part of the pressing rope pulling rope is provided with a sheet pulling rope; one end of the sheet pull rope is fixedly connected to the pressing rope; the other end of the sheet pull rope penetrates through the space between the back roller and the coating roller and then is connected to the fixed seat; the middle part of the sheet pull rope is provided with an elastic rope.

When the device works, the coating roller rotates to drive the slurry in the slurry box to adhere to the surface of the coating roller in the coating process, the slurry adhered to the surface of the coating roller is transferred to the surface of a moving current collector after passing through a gap between the slurry scraper and the coating roller, the influence of the tension of the current collector and the fluidity of the slurry is received in the transferring process, and further the smoothness of the upper surface of the slurry on the surface of the current collector is poor, so that the leveling scraper is arranged above the back roller, the gap between the leveling scraper and the surface of the current collector on the back roller is adjusted, the distance between the leveling scraper and the surface of the current collector is slightly smaller than the thickness of the slurry transferred to the surface of the current collector after passing through the gap between the slurry scraper and the coating roller (the thickness of the slurry passing through the leveling scraper meets the design requirement), and then the slurry on the current collector is scraped by the leveling scraper, so that the distribution of the slurry on the current collector is more uniform, the surface of the slurry is smoother, so that the surface quality of the coated battery grade piece is improved, the quality of the battery is improved, the thickness of the slurry on the surface of the current collector can be controlled more accurately, the influence of the slurry which is too thin or too thick on the rolling process of the battery grade piece during coating is avoided, the performance consistency of the battery grade piece is ensured, and the quality of the battery is improved; when the slurry is transferred to the surface of the collector moving on the backing roll from the coating roll, the phenomenon of laces (uneven edges) can occur, and simultaneously a leveling scraper can leave a small amount of slurry in a coating area during leveling so as to cause the slurry to move towards two sides, so that the coating surface is overlarge and laces are caused, and the utilization rate of the slurry is reduced, therefore, flexible baffles are arranged at two ends of the coating area formed between the backing roll, the coating roll, the slurry scraper and the leveling scraper, the distance between the flexible baffles is slightly larger than the width of the slurry adhered to the surface of the coating roll, when the tensioning rope is pulled by the flaky pulling rope, the elastic rope is arranged at the middle part of the flaky pulling rope, and the flexible baffles are pressed on the surfaces of the collector of the backing roll and the coating roll by the pressing rope under the action of the elastic rope, so that the slurry is prevented from moving towards the two ends of the coating area to cause the occurrence of laces on the edge of the sizing material, and then the regularity of the edges of the slurry is improved, the distance of cutting edges is reduced, and the waste of the slurry is reduced.

Preferably, the leveling blade and the backing roll are both connected to separate support columns; the back roll is rotatably connected to the independent support columns, and anti-seismic treatment is performed between the ground of the independent support columns.

The during operation, because the flattening scraper carries out the flattening to the thick liquids surface, consequently the vibrations that external equipment operation produced can disturb the flattening scraper, make the stability variation of flattening scraper, and then influence the flattening effect on flattening scraper flattening thick liquids surface, consequently through connecting flattening scraper and backing roll on independent support column, and set up the sand pit in independent support column below, support alone and connect on the concrete above the sand pit subaerial, and then avoided the vibrations that braced frame and subaerial other equipment operations produced to produce the disturbance to flattening scraper and backing roll, and then the mass flow body avoids influencing the flattening effect of flattening scraper to surface thick liquids.

Preferably, the leveling scraper is connected to the independent supporting column through a fine adjustment mechanism; the fine adjustment mechanism comprises a sliding seat, a second worm wheel, a second worm and a connecting shaft; the leveling scraper is rotationally connected to the sliding seat; the sliding seat is connected to the independent supporting column in a sliding mode; the sliding seats are symmetrically provided with the connecting shafts; one end of the connecting shaft is rotatably connected to the cross rod of the independent supporting column; the other end of the connecting shaft is provided with a thread structure; the other end of the connecting shaft is in threaded connection with the sliding seat; one side of the connecting shaft, which is close to the cross bar of the independent supporting column, is fixedly connected with the second worm wheel; the second worm wheel is in meshed transmission with the second worm; the second worm is rotatably connected to the cross rod of the independent support column.

When the device works, the smoothness of the surface of sizing agent on a current collector is improved by adjusting the clearance between the leveling scraper and the back roll, because the thickness of the coating is in micron unit, the assembly precision of the leveling scraper is greatly influenced on the clearance between the leveling scraper and the back roll when the leveling scraper is assembled on an independent support column through a fine adjustment mechanism, the thickness of the leveling scraper is determined and adjusted according to the thickness of the sizing agent coating when in adjustment, the leveling scraper is plugged between the leveling scraper and the back roll (two ends of the leveling scraper are plugged in) when in adjustment, then two worms are simultaneously rotated, the second worm drives the second worm wheel to rotate, the second worm wheel drives the connecting shaft to rotate, the connecting shaft drives the sliding seat to move, the leveling scraper is further driven to move towards the back roll, the two worms rotating while stopping when the leveling scraper contacts with the plug, then the second worm at one end of the leveling scraper is rotated, so that one end of the leveling scraper tightly presses the plug ruler, the No. two worms of flattening scraper other end afterwards, make the flattening scraper other end also sticis the clearance gauge, rotate the backing roll afterwards, remove the clearance gauge, and then carry out solitary adjustment through the both ends to the flattening scraper alone, reduce the clearance of assembly precision between flattening scraper and the backing roll, and then improved the smooth degree on mass collector sizing agent surface, because the worm gear transmission can have very big drive ratio, and then can carry out the regulation of micron to the flattening scraper, and then increased the accurate degree of interval between flattening scraper and the backing roll, and then improved the quality of coating, and then improved the quality of battery pole piece.

Preferably, a turnover cover is arranged on the slurry box; the flip cover can be turned over and opened; a sealing cover is arranged above the space between the two flexible baffles; the sealing cover is fixedly connected to the flexible baffle.

During operation, through setting up flip on the thick liquids case, and set up the closing cap between two flexible baffle, and then prolonged the speed of scattering and disappearing of thick liquids upper temperature, and then make the homogeneity of thick liquids viscosity in the thick liquids case, and then avoid making the sizing material mobility to appear the difference because of thick liquids viscosity is inhomogeneous in the thick liquids case, and then guaranteed sizing material from scribbling when roller transfer to the mass flow body on the sizing material evenly coats on the mass flow body, and then improved the quality of coating, and then improved the quality of several batteries, and then improved the quality that the battery is right.

Preferably, a dustproof soundproof cover is arranged on the outer side of the supporting frame; the dustproof sound-proof shield is fixedly connected to the supporting frame.

The during operation, set up dustproof sound-proof housing through the outside at braced frame, corresponding preventing rolling up the mechanism simultaneously, the position department of winding mechanism and thick liquids case is provided with the door, and then keep apart the inside space of coating equipment and the external world, and then avoid external dust to fall into on the mass flow body surface and coating do not pass through to dry battery pole piece, and then avoided the battery pole piece surface to appear scribbling defects such as some dirt, the resonance of mass flow body is aroused in the sound wave vibrations of avoiding external equipment to produce simultaneously, and then influence the homogeneity of coating, and then the quality of battery pole piece has been improved.

The invention has the following beneficial effects:

1. the invention controls the tension force of the current collector through the tensioning mechanism, so that the tension force of the current collector is in a stable state, when the tension force of the current collector is changed, the motion adjustment of the tensioning mechanism is followed, the interaction force between the current collector and the contact surface of the back roller is changed (the tightness degree of the contact between the current collector and the back roller is changed) in the process, so that the current collector near the back roller is wrinkled, the uniformity of slurry on the surface coating of the current collector is influenced, and the performance consistency of a battery grade sheet is influenced, therefore, the tensioning mechanism drives the driving rod to move in the process of adjusting the tension motion, the driving rod drives the oscillating rod to rotate around the fixed seat, the oscillating rod drives the pressing rod to move, and the pressing rod drives the pressing roller to move on the surface of the back roller (the pressing roller moves between the contact tangent point of the current collector and the back roller and the distance between the coating roller and the back roller), because the spring is arranged between the pressing rod and the swinging rod, the current collector is pressed on the back roller by the pressing roller all the time due to the stretching of the spring, and further the phenomenon that the current collector is too loose and wrinkles are generated between the back roller and the current collector due to the fact that the tensioning mechanism cannot adjust timely when the tensioning force of the current collector between the coating mechanism and the unwinding mechanism is changed due to the fact that the diameter of the coiled current collector is continuously reduced is avoided, and further the current collector is smooth and clings to the back roller when passing through the surface of the back roller, so that the condition that the coating is uneven due to the fact that slurry is coated on the surface of the current collector is avoided, the uniformity of the slurry coated on the surface of the current collector is further ensured, and the performance consistency of the battery grade piece is further ensured; meanwhile, the compression roller moves along with the movement of the tensioning mechanism, so that the pressure between the compression roller and the back roller is relatively stable, the surface tension of the current collector is greater than that of the coating solution, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade sheet is improved, and the quality of a lithium battery is improved; the compression roller avoids the contact between the coating surface of the current collector and the coating roller when the tension force of the current collector changes, and further avoids the coating roller from scratching the surface of the coating slurry of the current collector, and further ensures the quality of the battery grade sheet.

2. When the tension force of a driven current collector is changed, the first worm is driven to rotate through the motor, the first worm drives the turbine to rotate, the turbine drives the rotating shaft to rotate, the rotating shaft drives the connecting rod to swing, the connecting rod drives the tension roller to move, and the tension force of the current collector is adjusted; and because the tooth surface of the first worm is provided with the flexible layer, when the motor is started to drive the turbine to rotate, the flexible layer plays a role in buffering, so that the impact force generated when the motor is started is avoided from swinging the connecting rod, the influence on the tension of a current collector is avoided, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade piece is improved, and the quality of a lithium battery is improved.

3. In the invention, a first electric push rod and a second electric push rod are respectively arranged at two ends of a rotating shaft of a coating guide roller, a first pressure sensor is arranged between a guide rod of the first electric push rod and a first connector, a second pressure sensor is arranged between a guide rod of the second electric push rod and a second connector, when a current collector passes through the coating guide roller, the first pressure sensor and the second pressure sensor respectively measure pressure values at two sides of the current collector (the pressure value measured by the first sensor is P1, the pressure value measured by the second sensor is P2), the first sensor sends P2 to a temporary storage element in a controller by P1 and the second sensor, the calculating element is controlled to calculate difference values between P1 and P2 in the temporary storage element and a pressure value set in the controller (the pressure value set in the controller is Pe), and if the difference value between P1 and Pe is a positive value (is Pz1), the calculation element in the controller calculates the distance (marked as Sz1) required to move according to the Pz1, and then the controller controls the first electric push rod to retract to the Sz1, if the difference value of the P1-Pe is a negative value (marked as Pf1), the calculation element in the controller calculates the distance (marked as Sf1) required to move according to the Pf1, and then the controller controls the first electric push rod to extend out of the Sf1 distance, the latter sensor sends the P1 to the controller for repeated calculation, when the difference value of the P1-P2 is 0, the first calculation is finished, the first calculation is carried out after the set time interval, the same calculation is carried out by the P2 measured by the second sensor and the first sensor, the controller controls the second electric push rod to retract or extend out, and when the values of the first sensor and the second sensor deviate from the set time, the pressure values received by the two sides of the current collectors are automatically adjusted by extending or retracting through the first electric push rod and the second electric push rod, the current collector is prevented from wrinkling caused by uneven stress on two sides of the current collector, so that the surface smoothness of the current collector when the current collector passes through a coating mechanism is ensured, and the slurry is uniformly and flatly coated on the surface of the current collector, so that the coating quality is improved, the quality of a battery grade sheet is improved, and the quality of a lithium battery is improved; meanwhile, the tensioning mechanism can automatically adjust the tensioning wheel according to the numerical values of the first pressure sensor and the second pressure sensor to control the tensioning degree of the current collector.

4. In the invention, the leveling scraper is arranged above the back roll, the gap between the leveling scraper and the surface of the fluid-collecting body on the back roll is adjusted, the distance between the leveling scraper and the surface of the current collector is slightly smaller than the thickness of the slurry transferred to the surface of the current collector after the slurry passes through the gap between the slurry scraper and the coating roller (the thickness of the slurry passing through the leveling scraper meets the design requirement), further, the leveling scraper is used for leveling the slurry on the current collector, so that the slurry is more uniformly distributed on the current collector, the surface of the slurry is smoother, thereby improving the surface quality of the coated battery grade piece, further improving the quality of the battery, simultaneously more accurately controlling the thickness of the slurry on the surface of the current collector, further, the influence of too thin or too thick slurry on the rolling process of the battery grade piece during coating is avoided, the performance consistency of the battery grade piece is further ensured, and the quality of the battery is further improved; when the slurry is transferred to the surface of the collector moving on the backing roll from the coating roll, the phenomenon of laces (uneven edges) can occur, and simultaneously a leveling scraper can leave a small amount of slurry in a coating area during leveling so as to cause the slurry to move towards two sides, so that the coating surface is overlarge and laces are caused, and the utilization rate of the slurry is reduced, therefore, flexible baffles are arranged at two ends of the coating area formed between the backing roll, the coating roll, the slurry scraper and the leveling scraper, the distance between the flexible baffles is slightly larger than the width of the slurry adhered to the surface of the coating roll, when the tensioning rope is pulled by the flaky pulling rope, the elastic rope is arranged at the middle part of the flaky pulling rope, and the flexible baffles are pressed on the surfaces of the collector of the backing roll and the coating roll by the pressing rope under the action of the elastic rope, so that the slurry is prevented from moving towards the two ends of the coating area to cause the occurrence of laces on the edge of the sizing material, and then the regularity of the edges of the slurry is improved, the distance of cutting edges is reduced, and the waste of the slurry is reduced.

5. According to the invention, the leveling scraper and the back roll are connected to the independent supporting columns, and the sand pit is arranged below the independent supporting columns to independently support the concrete ground connected above the sand pit, so that the leveling scraper and the back roll are prevented from being disturbed by vibration generated by operation of the supporting frame and other equipment on the ground, and the leveling effect of the leveling scraper on the surface slurry of the current collector is further prevented from being influenced.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of a first overall structure of a coating apparatus in the present invention;

FIG. 2 is an exploded view of the coating apparatus of the present invention;

FIG. 3 is a front view of a coating apparatus of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a partial enlarged view at B in FIG. 3;

FIG. 6 is a schematic view of the attachment of the coating guide roll in the present invention;

FIG. 7 is a schematic view of the construction of the flexible baffle and hold-down cords of the present invention;

FIG. 8 is a schematic view of the leveling blade adjustment configuration of the present invention;

in the figure: the device comprises a supporting frame 1, an unreeling mechanism 2, a tensioning mechanism 3, a tensioning roller 31, a connecting rod 32, a rotating shaft 33, a supporting seat 34, a first worm wheel 35, a first worm 36, a guide mechanism 4, an unreeling guide roller 41, a coating guide roller 42, a reeling guide roller 43, a coating mechanism 5, a back roller 51, a coating roller 52, a slurry scraper 53, a slurry box 54, a turnover cover 541, a leveling scraper 55, a flexible baffle 56, a sealing cover 561, a pressing rope 57, a sheet-shaped pull rope 58, an elastic rope 59, a pressing crease-resistant mechanism 6, a fixed seat 61, a swing rod 62, a pressing rod 63, a pressing roller 64, a driving rod 65, a spring 66, a first electric push rod 7, a second electric push rod 71, a first pressure sensor 72, a second pressure sensor 73, an independent supporting column 8, a sliding seat 81, a second worm wheel 82, a second worm 83, a connecting shaft 84 and a dustproof and soundproof cover 9.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 8, a new energy automobile lithium battery pole piece coating device comprises a supporting frame 1, an unreeling mechanism 2, a tensioning mechanism 3, a guiding mechanism 4, a coating mechanism 5, a drying mechanism, a cold pressing mechanism and a reeling mechanism; the supporting frame 1 is fixedly connected to the ground; one end of the supporting frame 1 is provided with the unwinding mechanism 2; the unwinding mechanism 2 is used for unwinding the coiled current collector; the other end of the supporting frame 1 is provided with the winding mechanism; the rolling mechanism is used for rolling the compacted battery grade sheet;

the coating mechanism 5 is arranged behind the unwinding mechanism 2 and is used for coating slurry on the surface of the discharged current collector; the coating mechanism 5 comprises a back roll 51, a coating roll 52, a slurry scraper 53 and a slurry box 54; the coating roller 52 is rotatably connected to the bracket; the back roller 51 is arranged on one side of the coating roller 52; the other side of the coating roller 52 is provided with the slurry box 54; the slurry box 54 is fixedly connected to the support frame 1; the slurry scraper 53 is arranged above the coating roller 52;

the drying mechanism is arranged behind the coating mechanism 5 and is used for drying the current collector coated with the slurry;

the cold pressing mechanism is arranged behind the drying mechanism and is used for compacting the dried battery grade sheet;

the tensioning mechanism 3 is arranged between the unreeling mechanism 2 and the coating mechanism 5; the tensioning mechanism 3 is used for controlling the tensioning force of the current collector in the discharging process;

the guide mechanism 4 is arranged between the unreeling mechanism 2 and the reeling mechanism; the guide mechanism 4 comprises an uncoiling guide roller 41, a coating guide roller 42 and a coiling guide roller 43; an uncoiling guide roller 41 is arranged between the tensioning mechanism 3 and the unreeling mechanism 2; the unwinding guide roller 41 is rotatably connected to the support frame 1; a coating guide roller 42 is arranged between the adjusting mechanism and the coating mechanism 5; the coating guide roller 42 is connected to the support frame 1; the coiling guide roller 43 is arranged between the coiling mechanism and the cold pressing mechanism; the winding guide roller 43 is rotatably connected to the support frame 1; the coating equipment also comprises a pressing crease-resist mechanism 6; the pressing crease-resistance mechanism 6 comprises a fixed seat 61, a swing rod 62, a pressing rod 63, a pressing roller 64, a driving rod 65 and a spring 66; the pressure roller 64 is arranged below the coating roller 52 and the back roller 51 and is in contact with the back roller 51; the two ends of the rotating shaft of the pressing roller 64 are provided with the pressing rods 63; one end of the pressing rod 63 is rotatably connected to a rotating shaft of the pressing roller 64; the other end of the pressing rod 63 is provided with the swinging rod 62; the other end of the pressing rod 63 is rotatably connected to one end of the swinging rod 62; the other end of the swing lever 62 is provided with the driving lever 65; one end of the driving rod 65 is rotatably connected to the other end of the swinging rod 62; the other end of the driving rod 65 is connected to the tensioning mechanism 3; the middle part of the swing rod 62 is rotatably connected to the support seat 34; the supporting seat 34 is fixedly connected to the cross bar of the supporting frame 1; the spring 66 is arranged between one end of the swing rod 62 close to the driving rod 65 and one end of the pressing rod 63 close to the pressing roller 64; the two ends of the spring 66 are fixedly connected to the swing rod 62 and the pressing rod 63.

When the current collector works, slurry is continuously or intermittently and uniformly coated on the surface of a transmission current collector according to different lithium ion battery core manufacturing processes during lithium battery production, the current collector is in a roll shape, after the current collector is unfolded, a compacted battery grade sheet is wound into a roll and then stored and transported after sequentially passing through the uncoiling guide roller 41, the tensioning mechanism 3, the coating guide roller 42, the coating mechanism 5, the drying mechanism and the cold pressing mechanism, so that the current collector is continuously and uninterruptedly transmitted in the coating process, the diameter of the rolled current collector is continuously reduced in the process of producing the battery grade sheet, the tensioning force of the current collector in the transmission process is continuously changed, the tensioning force of the current collector is controlled by the tensioning mechanism 3, the tensioning force of the current collector is in a stable state, and when the tensioning force of the current collector is changed, the tensioning mechanism 3 is adjusted to move, and the interaction force of the contact surface of the current collector and the back roller 51 is changed in the process (the interaction force between the current collector and the back roller 51 is changed The tightness degree of contact changes), and then the current collector near the back roll 51 is wrinkled, and then the uniformity of slurry coating on the surface of the current collector is affected, and then the performance consistency of a battery grade sheet is affected, therefore, the tensioning mechanism 3 drives the driving rod 65 to move in the process of adjusting the tension motion, and then the driving rod 65 drives the oscillating rod 62 to rotate around the fixing seat 61, and then the oscillating rod 62 drives the pressing rod 63 to move, and then the pressing rod 63 drives the pressing roller 64 to move on the surface of the back roll 51 (the pressing roller 64 moves between the tangent point of the contact of the current collector and the back roll 51 and the closest distance between the coating roller 52 and the back roll 51), because the spring 66 is arranged between the pressing rod 63 and the oscillating rod 62, and then the spring 66 stretches to enable the current collector to be always pressed on the back roll 51 by the pressing roller 64, and then the tensioning mechanism 3 adjusts when the tension of the current collector between the coating mechanism 5 and the unwinding mechanism 2 is constantly changed due to the continuous reduction of the diameter of the coiled current collector The phenomenon that the back roll 51 and the current collector are too loose and are wrinkled is caused in time, so that the current collector is flat and clings to the back roll 51 when passing through the surface of the back roll 51, the condition that the slurry is coated on the surface of the current collector to cause uneven coating is avoided, the uniformity of the slurry coated on the surface of the current collector is ensured, and the performance consistency of a battery grade sheet is ensured; meanwhile, the compression roller 64 moves along with the movement of the tensioning mechanism 3, so that the pressure between the compression wheel and the back roller 51 is relatively stable, the surface tension of the current collector is greater than that of the coating solution, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade piece is improved, and the quality of a lithium battery is improved; the compression roller 64 prevents the current collector from contacting the coating surface of the coating roller 52 when the tension of the current collector changes, so that the coating roller 52 is prevented from scratching the surface of the current collector coating slurry, and the quality of the battery grade sheet is ensured.

As shown in fig. 3 to 5, the tensioning mechanism 3 includes a tensioning roller 31, a connecting rod 32, a rotating shaft 33, a supporting seat 34, a first worm wheel 35, a first worm 36 and a motor; the other end of the driving rod 65 is rotatably connected to the rotating shaft of the tension roller 31; the supporting seat 34 is fixedly connected to the ground; the support seat 34 is rotatably connected with the rotating shaft 33; the middle part of the rotating shaft 33 is fixedly connected with the first worm wheel 35; the first worm 36 is in meshed transmission with the first worm wheel 35; the first worm 36 is rotatably connected to the support seat 34; one end of the first worm 36 is fixedly connected to a rotating shaft of the motor; the mounting seat of the motor is fixedly connected to the supporting seat 34; the connecting rods 32 are arranged at two ends of the rotating shaft 33; one end of the connecting rod 32 is fixedly connected to the rotating shaft 33; the other end of the connecting rod 32 is rotatably connected to a rotating shaft of the tension roller 31; a flexible layer is arranged on the tooth surface of the first worm 36.

When the device works, when the tension force of a driven current collector changes, the motor drives the first worm 36 to rotate, the first worm 36 drives the turbine to rotate, the turbine drives the rotating shaft 33 to rotate, the rotating shaft 33 drives the connecting rod 32 to swing, and the connecting rod 32 drives the tension roller 31 to move, so that the tension force of the current collector is adjusted; because the tooth surface of the first worm 36 is provided with the flexible layer, when the motor is started to drive the turbine to rotate, the flexible layer plays a role in buffering, so that the impact force generated when the motor is started is avoided from swinging the connecting rod 32, the influence on the tension of the current collector is avoided, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade piece is improved, and the quality of a lithium battery is improved.

As shown in fig. 3 and 6, two ends of the rotating shaft of the coating guide roller 42 are respectively connected to the cross bar of the supporting frame 1 through a first electric push rod 7 and a second electric push rod 71; the cylinder bodies of the first electric push rod 7 and the second electric push rod 71 are fixedly connected to the supporting frame 1; the first connector at the end part of the extending end of the first electric push rod 7 is rotatably connected to the rotating shaft of the coating guide roller 42; a first pressure sensor 72 is arranged between the first connector and the guide rod of the first electric push rod 7; a second connector at the end part of the extending end of the second electric push rod 71 is rotatably connected to the rotating shaft of the coating guide roller 42; a second pressure sensor 73 is arranged between the second connector and the guide rod of the second electric push rod 71.

When the device works, the current collector is unwound from the unwinding mechanism 2 and passes through the tensioning mechanism 3 and then enters the coating mechanism 5 by bypassing the coating guide roller 42, if the current collector is subjected to deviation on two sides when passing through the coating guide roller 42, the current collector is wrinkled, and then the current collector in a wrinkled state enters the coating mechanism 5, so that the slurry is unevenly distributed on the current collector, therefore, a first electric push rod 7 and a second electric push rod 71 are respectively arranged at two ends of a rotating shaft of the coating guide roller 42, a first pressure sensor 72 is arranged between a guide rod of the first electric push rod 7 and a first connector, a second pressure sensor 73 is arranged between a guide rod of the second electric push rod 71 and a second connector, and when the current collector passes through the coating guide roller 42, the pressure values on two sides of the current collector are respectively measured by the first pressure sensor and the second pressure sensor 73 (the pressure value measured by the first pressure sensor is P1, the pressure value measured by the second sensor and the second sensor is marked as P2), the first sensor sends P1 and the second sensor P2 to a temporary storage element in the controller, a calculation element in the controller calculates the difference value between P1 and P2 in the temporary storage unit and a pressure value set in the controller (the pressure value set in the controller is marked as Pe), if the difference value between P1-Pe is a positive value (marked as Pz1), the calculation element in the controller calculates the distance (marked as Sz1) required to move according to Pz1, further the controller controls the first electric push rod 7 to retract the Sz1 distance, if the difference value between P1-Pe is a negative value (marked as Pf1), the calculation element in the controller calculates the distance (marked as Sf1) required to move according to Pf1, further the controller controls the first electric push rod 7 to extend the Sf1 distance, and the last sensor sends P1 to the controller to repeatedly calculate, when the difference value of P1-P2 is 0, one round of calculation is finished, one round of calculation is carried out after the interval set time, the same calculation contrast controller is carried out on P2 measured by the second sensor and the first sensor to control the second electric push rod 71 to retract or stretch out, and further when the values of the first sensor and the second sensor have deviation with the set pressure value, the pressure values on two sides of the current collector are automatically adjusted through the stretching out or retracting back of the first electric push rod 7 and the second electric push rod 71, so that the phenomenon that the current collector is wrinkled due to uneven stress on two sides of the current collector is avoided, the surface of the current collector is smooth when the current collector passes through the coating mechanism 5 is further ensured, the slurry is uniformly and smoothly coated on the surface of the current collector, the coating quality is further improved, the quality of a battery level piece is further improved, and the quality of a lithium battery is further improved; meanwhile, the tensioning mechanism 3 can automatically adjust the tensioning wheel according to the values of the first pressure sensor 72 and the second pressure sensor 73 to control the tensioning degree of the current collector.

As shown in fig. 3, 4 and 7, a leveling blade 55 is provided above the back roll 51; flexible baffle plates 56 are arranged at two ends of a coating area formed among the back roll 51, the coating roll 52, the slurry scraper 53 and the leveling scraper 55; the flexible baffle 56 is fixedly connected to the support frame 1 through a support; the edge of the flexible baffle 56 contacting the back roller 51 and the coating roller 52 is provided with a channel; a compression rope 57 is arranged in the channel; two ends of the pressing rope 57 are respectively fixedly connected to the side walls of the flexible baffle 56 close to the leveling scraper 55 and one side of the pulp scraper 53; the middle part of the pull rope of the pressing rope 57 is provided with a sheet pull rope 58; one end of the sheet-shaped pull rope 58 is fixedly connected to the pressing rope 57; the other end of the sheet-shaped pull rope 58 passes through the space between the back roller 51 and the coating roller 52 and then is connected to the fixed seat 61; an elastic rope 59 is arranged in the middle of the sheet-shaped pull rope 58.

During operation, the coating roller 52 rotates to drive the slurry in the slurry tank 54 to adhere to the surface of the coating roller 52 in the coating process, the slurry adhered to the surface of the coating roller 52 is transferred to the surface of a moving current collector after passing through a gap between the slurry scraper 53 and the coating roller 52, and is influenced by the tension of the current collector and the fluidity of the slurry in the transferring process, so that the flatness of the upper surface of the slurry on the surface of the current collector is poor, therefore, the leveling scraper 55 is arranged above the back roller 51, the gap between the leveling scraper 55 and the surface of the current collector on the back roller 51 is adjusted, the distance between the leveling scraper 55 and the surface of the current collector is slightly smaller than the thickness of the slurry transferred to the surface of the current collector after passing through the gap between the slurry scraper 53 and the coating roller 52 (the thickness of the slurry passing through the leveling scraper 55 meets the design requirement), and then the slurry on the current collector is leveled by the leveling scraper 55, the distribution of the slurry on the current collector is more uniform, the surface of the slurry is smoother, the surface quality of the coated battery grade piece is improved, the quality of the battery is improved, the thickness of the slurry on the surface of the current collector can be more accurately controlled, the influence of the slurry which is too thin or too thick on the rolling process of the battery grade piece during coating is avoided, the performance consistency of the battery grade piece is ensured, and the quality of the battery is improved; when the slurry is transferred from the coating roller 52 to the surface of the collector moving on the backing roller 51, a lace phenomenon (uneven edge) can occur, and simultaneously, a small amount of slurry is left in a coating area by the leveling scraper 55 during leveling, so that the slurry can move towards two sides, the coating surface is overlarge, the lace is caused, and the utilization rate of the slurry is reduced, therefore, flexible baffles 56 are arranged at two ends of the coating area formed between the backing roller 51, the coating roller 52, the slurry scraper 53 and the leveling scraper 55, the distance between the flexible baffles 56 is slightly larger than the width of the slurry adhered to the surface of the coating roller 52, when the compression rope 57 is pulled by the sheet-shaped pull rope 58, because the elastic rope 59 is arranged at the middle part of the sheet-shaped pull rope 58, the compression rope 57 compresses the edges of the flexible baffles 56 close to the backing roller 51 and the coating roller 52 on the surfaces of the collector of the backing roller 51 and the coating roller 52 under the action of the elastic rope 59, and the slurry is blocked to prevent the slurry from moving towards the edges of the slurry to cause the lace phenomenon, and then the regularity of the edges of the slurry is improved, the distance of cutting edges is reduced, and the waste of the slurry is reduced.

As shown in fig. 1-3, the screed 55 and the backing roll 51 are both attached to separate support posts 8; the back roll 51 is rotatably connected to the independent support columns 8, and anti-seismic treatment is performed between the ground surfaces of the independent support columns 8.

The during operation, because flattening scraper 55 carries out the flattening to the thick liquids surface, consequently the vibrations that external equipment operation produced can disturb flattening scraper 55, make flattening scraper 55's stability variation, and then influence flattening scraper 55 flattening thick liquids surface's flattening effect, consequently through connecting flattening scraper 55 and backing roll 51 on independent support column, and set up the sand pit in independent support column 8 below, support the concrete of connection above the sand pit alone subaerial, and then avoided the vibrations that braced frame 1 and subaerial other equipment operations produced to produce the disturbance to flattening scraper 55 and backing roll 51, and then avoid influencing flattening scraper 55 to the flattening effect of mass flow surface thick liquids.

As shown in fig. 4 and 8, the leveling blades 55 are attached to the individual support columns 8 by a fine adjustment mechanism; the fine adjustment mechanism comprises a sliding seat 81, a second worm wheel 82, a second worm 83 and a connecting shaft 84; the leveling blade 55 is rotatably connected to the sliding seat 81; the sliding seat 81 is connected to the independent supporting column 8 in a sliding manner; the sliding seat 81 is symmetrically provided with the connecting shafts 84; one end of the connecting shaft 84 is rotatably connected to the cross bar of the independent supporting column 8; the other end of the connecting shaft 84 is provided with a thread structure; the other end of the connecting shaft 84 is in threaded connection with the sliding seat 81; the second worm gear 82 is fixedly connected to one side, close to the cross bar of the independent support column 8, of the connecting shaft 84; the second worm wheel 82 is in meshed transmission with the second worm 83; the second worm 83 is rotatably connected to the cross bar of the independent support column 8.

When the plug ruler is in operation, the smoothness of the surface of sizing agent on a current collector is improved by adjusting the gap between the leveling scraper 55 and the back roll 51, because the thickness of the coating is in micron unit, the assembling precision of the leveling scraper 55 is greatly influenced on the gap between the leveling scraper 55 and the back roll 51 when the leveling scraper 55 is assembled on the independent supporting column 8 through a fine adjustment mechanism, the thickness of the plug ruler is determined and adjusted according to the thickness of the sizing agent coating when in adjustment, the plug ruler is plugged between the leveling scraper 55 and the back roll 51 (two ends of the leveling scraper 55 are plugged in) when in adjustment, then two second worms 83 are simultaneously rotated, the second worm 83 drives the second worm wheel 82 to rotate, the second worm wheel 82 drives the connecting shaft 84 to rotate, the sliding seat 81 is driven by the connecting shaft 84 to move, the leveling scraper 55 is driven to move towards the back roll 51, when the leveling scraper 55 contacts with the plug ruler, the two second worms 83 which rotate simultaneously are stopped, then rotate No. two worms 83 of flattening scraper 55 one end, make the one end of flattening scraper 55 sticis the clearance gauge, No. two worms 83 of flattening scraper 55 the other end afterwards, make the flattening scraper 55 other end also sticis the clearance gauge, rotate backing roll 51 afterwards, remove the clearance gauge, and then carry out solitary adjustment to the both ends of flattening scraper 55 alone, reduce the clearance of assembly precision between to flattening scraper 55 and backing roll 51, and then improved the smooth degree on mass flow body sizing agent surface, because worm gear transmission can have very big drive ratio, and then can carry out the regulation of micron to flattening scraper 55, and then increased the degree of accuracy of interval between flattening scraper 55 and the backing roll 51, and then improved the quality of coating, and then improved the quality of battery pole piece.

As shown in fig. 3 and 4, the slurry tank 54 is provided with a flip 541; the flip 541 can be turned over and opened; a sealing cover 561 is arranged above the space between the two flexible baffles 56; the cover 561 is fixedly connected to the flexible baffle 56.

During operation, through set up flip 541 on thick liquids case 54 to set up closing cap 561 between two flexible baffle 56, and then prolonged the speed of scattering and disappearing of thick liquids upper temperature, and then make the homogeneity of thick liquids viscosity in thick liquids case 54, and then avoid making the sizing material mobility to appear the difference because of thick liquids viscosity is inhomogeneous in thick liquids case 54, and then when having guaranteed that the sizing material shifts to the mass collector from scribbling roller 52 sizing material, the sizing material is evenly coated on the mass collector, and then the quality of coating has been improved, and then the quality of several batteries has been improved, and then the quality of battery pair has been improved.

As shown in fig. 1 and 2, a dust and sound proof cover 9 is arranged on the outer side of the support frame 1; the dust-proof and sound-proof cover 9 is fixedly connected to the support frame 1.

The during operation, set up dustproof sound-proof housing 9 through the outside at braced frame 1, corresponding anti-roll mechanism simultaneously, the position department of winding mechanism and thick liquids case 54 is provided with the door, and then keep apart the inside space of coating equipment with the external world, and then avoid external dust to fall into on the current collector surface and the coating does not dry the battery pole piece by baking, and then avoided the battery pole piece surface to appear scribbling some defects such as dirt, the sound wave vibrations of avoiding external equipment to produce simultaneously arouse the resonance of current collector, and then influence the homogeneity of coating, and then the quality of battery pole piece has been improved.

When the device works, the tensioning mechanism 3 is used for controlling the tensioning force of the current collector, so that the tensioning force of the current collector is in a stable state, when the tensioning force of the current collector is changed, the tensioning mechanism 3 is used for motion adjustment, the interaction force between the contact surface of the current collector and the back roller 51 is changed (the contact tightness degree between the current collector and the back roller 51 is changed) in the process, the current collector near the back roller 51 is wrinkled, the coating uniformity of slurry on the surface of the current collector is influenced, and the performance consistency of a battery grade sheet is influenced, therefore, the tensioning mechanism 3 drives the driving rod 65 to move in the process of adjusting the tensioning force motion, the driving rod 65 drives the oscillating rod 62 to rotate around the fixed seat 61, the oscillating rod 62 drives the pressing rod 63 to move, and the pressing rod 63 drives the pressing roller 64 to move on the surface of the back roller 51 (the pressing roller 64 moves between the closest distance between the coating roller 52 and the back roller 51 at the contact tangent point of the current collector and the back roller 51), because the spring 66 is arranged between the pressing rod 63 and the swinging rod 62, the current collector is pressed on the back roller 51 by the pressing roller 64 all the time due to the stretching of the spring 66, and further the phenomenon that the back roller 51 and the current collector are too loose and wrinkles are generated due to untimely adjustment of the tensioning mechanism 3 when the tensioning force of the current collector between the coating mechanism 5 and the unwinding mechanism 2 is changed due to the continuous reduction of the diameter of the coiled current collector is avoided, so that the current collector is smooth and clings to the back roller 51 when passing through the surface of the back roller 51, the phenomenon that the coating is uneven due to the fact that slurry is coated on the surface of the current collector is avoided, the uniformity of the coating of the slurry on the surface of the current collector is further ensured, and the performance consistency of a battery grade piece is further ensured; meanwhile, the compression roller 64 moves along with the movement of the tensioning mechanism 3, so that the pressure between the compression wheel and the back roller 51 is relatively stable, the surface tension of the current collector is greater than that of the coating solution, the slurry can be uniformly and flatly spread, the coating quality is improved, the quality of a battery grade piece is improved, and the quality of a lithium battery is improved; the compression roller 64 prevents the current collector from contacting the coating surface of the coating roller 52 when the tension of the current collector changes, so that the coating roller 52 is prevented from scratching the surface of the current collector coating slurry, and the quality of the battery grade sheet is ensured.

While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A new energy automobile lithium battery pole piece coating device comprises a supporting frame (1), an unreeling mechanism (2), a tensioning mechanism (3), a guide mechanism (4), a coating mechanism (5), a drying mechanism, a cold pressing mechanism and a reeling mechanism; the supporting frame (1) is fixedly connected to the ground; one end of the supporting frame (1) is provided with the unreeling mechanism (2); the unwinding mechanism (2) is used for unwinding the coiled current collector; the other end of the supporting frame (1) is provided with the winding mechanism; the rolling mechanism is used for rolling the compacted battery grade sheet;

the coating mechanism (5) is arranged behind the unwinding mechanism (2) and is used for coating slurry on the surface of the discharged current collector; the coating mechanism (5) comprises a back roll (51), a coating roll (52), a slurry scraper (53) and a slurry box (54); the bracket is rotatably connected with the coating roller (52); the back roll (51) is arranged on one side of the coating roll (52); the other side of the coating roller (52) is provided with the slurry box (54); the slurry box (54) is fixedly connected to the supporting frame (1); the pulp scraper (53) is arranged above the coating roller (52);

the drying mechanism is arranged behind the coating mechanism (5) and is used for drying the current collector coated with the slurry;

the tensioning mechanism (3) is arranged between the unreeling mechanism (2) and the coating mechanism (5); the tensioning mechanism (3) is used for controlling the tensioning force of the current collector in the discharging process;

the guide mechanism (4) is arranged between the unwinding mechanism (2) and the winding mechanism; the guide mechanism (4) comprises an uncoiling guide roller (41), a coating guide roller (42) and a coiling guide roller (43); an uncoiling guide roller (41) is arranged between the tensioning mechanism (3) and the uncoiling mechanism (2); the uncoiling guide roll (41) is rotationally connected to the supporting frame (1); a coating guide roller (42) is arranged between the adjusting mechanism and the coating mechanism (5); the coating guide roller (42) is connected to the support frame (1); the coiling guide roller (43) is arranged between the coiling mechanism and the cold pressing mechanism; the winding guide roller (43) is rotationally connected to the support frame (1); the method is characterized in that: the pressing crease-resist mechanism (6) is also included; the pressing crease-resistance mechanism (6) comprises a fixed seat (61), a swing rod (62), a pressing rod (63), a pressing roller (64), a driving rod (65) and a spring (66); the pressure roller (64) is arranged below the coating roller (52) and the back roller (51) and is in contact with the back roller (51); the two ends of the rotating shaft of the pressing roller (64) are provided with the pressing rods (63); one end of the pressing rod (63) is rotatably connected to a rotating shaft of the pressing roller (64); the other end of the pressing rod (63) is provided with the swinging rod (62); the other end of the pressing rod (63) is rotatably connected to one end of the swinging rod (62); the other end of the swinging rod (62) is provided with the driving rod (65); one end of the driving rod (65) is rotatably connected to the other end of the swinging rod (62); the other end of the driving rod (65) is connected to the tensioning mechanism (3); the middle part of the swing rod (62) is rotatably connected to the supporting seat (34); the supporting seat (34) is fixedly connected to a cross bar of the supporting frame (1); the spring (66) is arranged between one end of the swinging rod (62) close to the driving rod (65) and one end of the pressing rod (63) close to the pressing roller (64); and two ends of the spring (66) are fixedly connected to the swinging rod (62) and the pressing rod (63).

2. The new energy automobile lithium battery pole piece coating equipment of claim 1, characterized in that: the tensioning mechanism (3) comprises a tensioning roller (31), a connecting rod (32), a rotating shaft (33), a supporting seat (34), a first worm wheel (35), a first worm (36) and a motor; the other end of the driving rod (65) is rotatably connected to a rotating shaft of the tension roller (31); the supporting seat (34) is fixedly connected to the ground; the supporting seat (34) is rotatably connected with the rotating shaft (33); the middle part of the rotating shaft (33) is fixedly connected with the first worm wheel (35); the first worm (36) is in meshed transmission with the first worm wheel (35); the first worm (36) is rotationally connected to the supporting seat (34); one end of the first worm (36) is fixedly connected to a rotating shaft of the motor; the mounting seat of the motor is fixedly connected to the supporting seat (34); the two ends of the rotating shaft (33) are provided with the connecting rods (32); one end of the connecting rod (32) is fixedly connected to the rotating shaft (33); the other end of the connecting rod (32) is rotatably connected to a rotating shaft of the tension roller (31); a flexible layer is arranged on the tooth surface of the first worm (36).

3. The new energy automobile lithium battery pole piece coating equipment of claim 2, characterized in that: two ends of a rotating shaft of the coating guide roller (42) are connected to a cross bar of the supporting frame (1) through a first electric push rod (7) and a second electric push rod (71) respectively; the cylinder bodies of the first electric push rod (7) and the second electric push rod (71) are fixedly connected to the supporting frame (1); a first connector at the end part of the extending end of the first electric push rod (7) is rotatably connected to a rotating shaft of the coating guide roller (42); a first pressure sensor (72) is arranged between the first connector and the guide rod of the first electric push rod (7); a second connector at the end part of the extending end of the second electric push rod (71) is rotatably connected to a rotating shaft of the coating guide roller (42); a second pressure sensor (73) is arranged between the second connector and the guide rod of the second electric push rod (71).

4. The new energy automobile lithium battery pole piece coating equipment of claim 3, characterized in that: a leveling scraper (55) is arranged above the back roll (51); flexible baffles (56) are arranged at two ends of a coating area formed among the back roll (51), the coating roll (52), the slurry scraper (53) and the leveling scraper (55); the flexible baffle (56) is fixedly connected to the support frame (1) through a support; the edge of the flexible baffle (56) contacting the back roller (51) and the coating roller (52) is provided with a channel; a compression rope (57) is arranged in the channel; two ends of the pressing rope (57) are respectively and fixedly connected to the side walls of the flexible baffle (56) close to the leveling scraper (55) and one side of the pulp scraper (53); the middle part of the pull rope of the pressing rope (57) is provided with a sheet pull rope (58); one end of the sheet-shaped pull rope (58) is fixedly connected to the pressing rope (57); the other end of the sheet-shaped pull rope (58) penetrates through the space between the back roller (51) and the coating roller (52) and then is connected to the fixed seat (61); the middle part of the sheet-shaped pull rope (58) is provided with an elastic rope (59).

5. The new energy automobile lithium battery pole piece coating equipment as claimed in claim 4, characterized in that: the leveling scraper (55) and the backing roll (51) are both connected to independent support columns (8); the back roll (51) is rotatably connected to the independent supporting columns (8), and anti-seismic treatment is performed between the ground surfaces of the independent supporting columns (8).

6. The new energy automobile lithium battery pole piece coating equipment of claim 5, characterized in that: the leveling scraper (55) is connected to the independent supporting column (8) through a fine adjustment mechanism; the fine adjustment mechanism comprises a sliding seat (81), a second worm wheel (82), a second worm (83) and a connecting shaft (84); the leveling scraper (55) is rotatably connected to the sliding seat (81); the sliding seat (81) is connected to the independent supporting column (8) in a sliding manner; the sliding seat (81) is symmetrically provided with the connecting shafts (84); one end of the connecting shaft (84) is rotatably connected to the cross bar of the independent supporting column (8); the other end of the connecting shaft (84) is provided with a thread structure; the other end of the connecting shaft (84) is in threaded connection with the sliding seat (81); one side, close to the cross bar of the independent supporting column (8), of the connecting shaft (84) is fixedly connected with the second worm wheel (82); the second worm wheel (82) is in meshed transmission with the second worm (83); the second worm (83) is rotatably connected to the cross bar of the independent supporting column (8).

7. The new energy automobile lithium battery pole piece coating equipment of claim 6, characterized in that: a turnover cover (541) is arranged on the slurry box (54); the turnover cover (541) can be turned over and opened; a sealing cover (561) is arranged above the space between the two flexible baffles (56); the sealing cover (561) is fixedly connected to the flexible baffle (56).

8. The new energy automobile lithium battery pole piece coating equipment of claim 7, characterized in that: a dustproof and soundproof cover (9) is arranged on the outer side of the supporting frame (1); the dustproof sound-proof shield (9) is fixedly connected to the supporting frame (1).