CN114759310A - Wet process lithium cell is deoiling system for diaphragm - Google Patents
Wet process lithium cell is deoiling system for diaphragm Download PDFInfo
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- CN114759310A CN114759310A CN202210427380.1A CN202210427380A CN114759310A CN 114759310 A CN114759310 A CN 114759310A CN 202210427380 A CN202210427380 A CN 202210427380A CN 114759310 A CN114759310 A CN 114759310A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a wet-method lithium battery diaphragm oil removal system which comprises a transmission assembly, two oil removal assemblies and an oil collection assembly, wherein the transmission assembly comprises a front end roller and a rear end roller which drive a diaphragm to transversely transmit, the two oil removal assemblies are respectively positioned on the upper side and the lower side of the diaphragm, each oil removal assembly comprises an oil removal transmission belt parallel to the diaphragm, the oil removal transmission belt is made of an oil absorption material with a porous structure, a gap for the diaphragm to pass through is formed between the two oil removal transmission belts, the oil collection assembly comprises an oil extrusion roller set and an exhaust fan, the exhaust fan comprises a shell and blades rotating in the shell, the shell comprises an inner shell and an outer shell, a cavity is formed between the inner shell and the outer shell, oil through holes are formed in the wall surface of the inner shell, an oil discharge pipe communicated with an oil collection tank is connected to the bottom surface of the outer shell, the oil extrusion roller set is used for extruding oil in the oil removal transmission belt, and an oil extrusion roller set is arranged above the oil extrusion roller set, And exhaust hoods are respectively arranged below the lower oil squeezing roller sets and are communicated with the cavity of the exhaust fan shell through exhaust pipes.
Description
Technical Field
The invention relates to an oil removing system for a wet lithium battery diaphragm, and belongs to the technical field of lithium battery diaphragm production.
Background
In the production process of the wet lithium battery diaphragm, the diaphragm which is subjected to sheet casting and bidirectional or unidirectional stretching contains more white oil in the film surface and film gaps before the diaphragm enters the extraction device, the white oil-containing diaphragm is soaked and extracted by extraction liquid in the extraction device, the white oil is retained in the extraction liquid in the extraction device, the white oil-free diaphragm is subjected to extraction and drying and then is processed in the subsequent production process step, and the extraction liquid containing the white oil is treated by an overflow and liquid recovery device of the extraction device, so that the aim of recycling is fulfilled. Because the oil film after casting and stretching at the present stage does not have a device for further effectively reducing the oil content of the membrane before extraction, especially the white oil content of the production line after speed increase is increased, the oil content of the membrane carrying the white oil has great influence on the capacity of an extraction device, the handling capacity of a liquid recovery device and other parameters, and the energy consumption and the cost of the extraction device and the liquid recovery device are directly influenced.
Disclosure of Invention
The invention aims to provide an oil removal system for a wet lithium battery diaphragm, which reduces the oil content of the diaphragm before extraction and is used for solving the technical problems of large extraction capacity design, large recovery and treatment capacity of a liquid recovery device and high energy consumption of the existing extraction device.
The invention adopts the following technical scheme: a deoiling system for a wet lithium battery diaphragm comprises a transmission assembly, a deoiling assembly and an oil collecting assembly, wherein the transmission assembly comprises a front end roller and a rear end roller which drive the diaphragm to transversely drive, the front end roller and the rear end roller are parallel to the horizontal plane, the deoiling assembly comprises two deoiling assemblies, the two deoiling assemblies are respectively positioned on the upper side and the lower side of the diaphragm between the front end roller and the rear end roller, each deoiling assembly comprises a frame, two deoiling transmission rollers installed on the frame and a deoiling transmission belt wound on the two deoiling transmission rollers, the deoiling transmission belt is parallel to the diaphragm and made of an oil absorbing material with a porous structure, a gap for the diaphragm to pass through is formed between the deoiling transmission belts of the two deoiling assemblies, each deoiling transmission belt is provided with a near section close to the diaphragm and a far section far from the diaphragm, the oil collecting assembly comprises an oil squeezing roller set and an exhaust fan, and the exhaust fan comprises a shell body shell, Be located the pivot of casing and the blade of rotation under the pivot drives, the casing includes inner shell and shell, the cavity has between inner shell and the shell, oil penetration hole has been seted up on the inner shell wall, be connected with the row oil pipe on the shell bottom surface, be connected with the sump oil tank on arranging the oil pipe, be connected with the blast pipe on the sump oil tank, crowded oily roller group is including setting up the crowded oily roller in both sides about the far-end section of deoiling drive belt respectively, install heating mechanism in the crowded oily roller, the below of crowded oily roller is equipped with the oil catch bowl, the top of the crowded oily roller set of the deoiling drive belt of diaphragm top, the below of the crowded oily roller set of deoiling drive belt of diaphragm below is equipped with the exhaust hood respectively, the exhaust hood passes through the cavity intercommunication of exhaust pipe and exhaust fan casing.
The fan filter is characterized in that a filtering channel is fixed on the outer side of the fan shell, one end of the filtering channel is communicated with the exhaust pipe, the other end of the filtering channel is communicated with the inside of the inner shell, an oil filtering plate is arranged in the filtering channel, an inlet hole plate is arranged at the joint of the filtering channel and the outer shell, a liquid collecting disc is arranged at the bottom in the filtering channel, an overflow pipe is connected to the liquid collecting disc, and the overflow pipe leads into an oil collecting tank.
The blade includes epipleural, lower plate and end plate, and the end plate is close to the inner shell wall, has seted up the oil drain hole on the end plate, and the porous structure of lower plate for having the trompil, epipleural are the enclosed construction of no trompil, blade inside has the adsorbed layer, and the adsorbed layer is in the space between epipleural, lower plate and the end plate, and the adsorbed layer is the porous multilayer oil absorption cotton felt that takes, and epipleural and lower plate are the polytetrafluoroethylene board.
The oil penetration holes are uniformly distributed on the wall surface of the inner shell, and the oil penetration holes are tapered holes with diameters gradually reduced from inside to outside.
The oil removal transmission belt sequentially comprises an outer oil absorption layer, an oil storage layer and an inner oil absorption layer from outside to inside, the outer oil absorption layer is used for contacting oil on the diaphragm, the outer oil absorption layer is of a carbon fiber layer porous structure, the oil storage layer is a multi-layer oil absorption cotton felt with holes, and the inner oil absorption layer is of a carbon fiber reinforced porous structure.
The frame includes the connecting rod support, installs the roller bearing frame on the connecting rod support, installs roller axle on the bearing roller seat, the deoiling driving roller is fixed at roller epaxially, connecting rod support lower part is fixed with the nut seat, and the lead screw of vertical setting is installed to nut seat internal thread, the below position department that lies in roller axle in the frame is equipped with adjusting motor, is connected with the transmission shaft that the level set up on adjusting motor's the output, and 90 commutators are installed to the tip of transmission shaft, the output of 90 commutators and the lower extreme fixed connection of lead screw, and when adjusting motor passed through the transmission shaft, when 90 commutator drive lead screw rotates, nut seat driven connecting rod support reciprocated along the lead screw.
And a temperature control mechanism is connected to the heating mechanism in the oil squeezing roller.
The rear part of the front-end roller is connected with a speed feedback mechanism.
The front-end roller and the rear-end roller respectively comprise three rollers, two rollers are positioned below the three rollers, and one roller is positioned above the three rollers; the oil squeezing roller sets on each oil removing transmission belt are respectively provided with three sets, and the three sets of oil squeezing roller sets are positioned in the middle of the oil removing transmission belt.
The exhaust pipe is a flexible pipeline; and a hood is arranged at the top of the exhaust pipe.
The beneficial effects of the invention are: when the oil removing system is used, the front end roller and the rear end roller are utilized to drive the diaphragm to horizontally drive, the oil removing transmission belt drives the upper side and the lower side of the diaphragm to absorb white oil on the diaphragm surface while the diaphragm drives the diaphragm to rotate on the two sides of the oil removing transmission belt, the oil squeezing roller group rotates on the two sides of the oil removing transmission belt to squeeze out the white oil absorbed on the oil removing transmission belt, the oil squeezing roller group is provided with a heating mechanism to heat the oil squeezing roller so as to adhere the roller surface and evaporate part of the white oil on the partial oil removing transmission belt to form an oil-gas mixture, the exhaust fan is started, the oil-gas mixture enters the inner part of the inner shell of the exhaust fan through the oil collecting cover and the exhaust pipe, the blades rotate to generate centrifugal force to throw oil drops in the oil-gas mixture to the surface of the inner shell, the oil drops enter a cavity between the inner shell and the outer shell through the oil penetrating holes on the inner shell, finally enter the oil collecting tank through the oil discharging pipe, and gas sucked in the fan sequentially enters a cavity between the inner shell and the outer shell, And the oil collecting tank is finally discharged by the exhaust pipe.
Preferably, the filtering channel is arranged on the outer side of the fan shell, after entering the filtering channel, the oil-gas mixture is firstly subjected to coarse filtering through the oil filtering plate and then enters the fan shell through the inlet orifice plate, and oil generated by coarse filtering is concentrated on the liquid collecting disc and then is guided into the liquid collecting tank through the overflow pipe.
Preferably, the oil penetration hole is a tapered hole, so that oil can quickly enter a cavity between the outer shell and the inner shell, and splashing backflow of the oil entering the interlayer is reduced.
Preferably, the oil removal transmission belt is divided into an outer oil absorption layer, an oil storage layer and an inner oil absorption layer from outside to inside, the outer oil absorption layer with the porous structure can quickly absorb redundant white oil on the membrane surface of the diaphragm, and the oil removal layer is used for storing oil.
Preferably, the screw rod is driven to rotate by the adjusting motor, the nut seat moves up and down on the screw rod when the screw rod rotates, so that the connecting rod support is driven to move up and down, the height position of the oil removing transmission roller is adjusted, and the size of a gap between the two oil removing transmission belts is changed.
Preferably, the heating mechanism in the oil squeezing roller is connected with a temperature control mechanism, and the heating temperature of the oil squeezing roller can be controlled by the temperature control mechanism, so that the white oil carried by the oil-containing diaphragm can be effectively evaporated.
Preferably, the speed feedback mechanism can feed back the diaphragm driving speed to the control system, so that the rotating speed of the front-end roller or the rear-end roller is adjusted to adjust the diaphragm speed.
Preferably, a plurality of rollers are adopted to enable the transmission of the diaphragm to be more stable.
Drawings
Fig. 1 is a schematic structural diagram of a degreasing system for a wet lithium battery separator according to an embodiment of the invention;
FIG. 2 is a schematic view of a degreasing transmission belt;
FIG. 3 is a schematic view of an oil-removing exhaust fan;
FIG. 4 is a schematic view of the sandwich structure between the inner and outer shells of the oil-removing exhaust fan;
FIG. 5 is a schematic view of a fan blade;
FIG. 6 is a schematic view of the oil removing driving roller and the frame;
FIG. 7 is a table showing the oil removing effect of the cast piece oiliness diaphragm in example 1;
FIG. 8 is a table showing the oil removal performance of the separator after stretching in example 2.
In the figure: 1. a front-end roller, 4 speed feedback mechanisms, 5a frame, 5a regulating motor, 5b a transmission shaft, 5 c.90-degree commutators, 5d lead screws, 5e nut seats, 5h connecting rod supports, 5i roller bearing seats, 5j roller shafts, 5k driving motors, 6 deoiling transmission rollers, 8 deoiling transmission belts, 8a upper oil absorption layer, 8b oil storage layer, 8c lower oil absorption layer, 9 oil extrusion roller sets, 10 oil collection tanks, 11 exhaust hoods, 12 exhaust pipes, 13 filtering channels, 13a oil filtering plates, 13b liquid collection discs, 14 overflow pipes, 15 exhaust fans, 15a outer shells, 15b inlet pore plates, 15c inner shells, 15d oil penetrating holes, 15e rotating shafts, 15f blades, 15f-1 upper side plates, 15f-2 adsorption layers, 15f-3 lower side plates, 15f-4 oil discharge pipes, 15g oil discharge pipes and 16 oil collection tanks, 17. exhaust pipe, 18, rear roller.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 6, the arrow direction in fig. 1 indicates the diaphragm transmission direction, the oil removing system for the wet lithium battery diaphragm according to an embodiment of the present invention includes a transmission assembly, two oil removing assemblies and an oil collecting assembly, the transmission assembly includes a front end roller 1 and a rear end roller 18 for driving the diaphragm to transmit transversely, the front end roller 1 and the rear end roller 18 are both parallel to the horizontal plane, the two oil removing assemblies are respectively located at the upper and lower sides of the diaphragm between the front end roller 1 and the rear end roller 18, each oil removing assembly includes a frame 5, two oil removing transmission rollers 6 mounted on the frame 5 and an oil removing transmission belt 8 wound on the two oil removing transmission rollers 6, the oil removing transmission belt 8 is parallel to the diaphragm, the oil removing transmission belt 8 is an oil absorbing material with a porous structure, and a gap for the diaphragm to pass through is provided between the oil removing transmission belts 8 of the two oil removing assemblies, each oil removing transmission belt 8 is provided with a near section close to the diaphragm and a far section far away from the diaphragm, the oil collecting assembly comprises an oil squeezing roller set 9 and an exhaust fan 15, the exhaust fan 15 comprises a shell, a rotating shaft 15e positioned in the shell and blades 15f driven by the rotating shaft 15e to rotate, the shell comprises an inner shell 15c and an outer shell 15a, a cavity is arranged between the inner shell 15c and the outer shell 15a, the wall surface of the inner shell 15c is provided with an oil penetration hole, the bottom surface of the outer shell 15a is connected with an oil discharge pipe 15g, the oil discharge pipe 15g is connected with an oil collecting tank 16, the oil collecting tank 16 is connected with an exhaust pipe 17, the oil squeezing roller set 9 comprises oil squeezing rollers respectively arranged at the upper side and the lower side of the far section of the oil removing transmission belt 8, a heating mechanism is arranged in the oil squeezing rollers, an oil collecting groove 11 is arranged below the oil squeezing roller set 8 above the diaphragm, and an exhaust hood 11 is respectively arranged below the oil squeezing roller set of the oil removing transmission belt 8 below the diaphragm, the exhaust hood 11 is communicated with the cavity of the shell of the exhaust fan 15 through an exhaust duct 12. The exhaust pipe 12 is a flexible pipeline; the top of the exhaust pipe 17 is provided with a blast cap.
A filtering channel 13 is fixed on the outer side of the fan shell, one end of the filtering channel 13 is communicated with the exhaust pipe 12, the other end of the filtering channel 13 is communicated with the inside of the inner shell 15c, an oil filtering plate 13a is arranged in the filtering channel 13, an inlet pore plate 15b is arranged at the joint of the filtering channel 13 and the outer shell 15a, a liquid collecting tray 13b is arranged at the bottom in the filtering channel 13, an overflow pipe 14 is connected to the liquid collecting tray 13b, and the overflow pipe 14 is communicated into an oil collecting tank 16. The oil penetration holes 15d are uniformly distributed on the wall surface of the inner shell 15c, and the oil penetration holes 15d are tapered holes with diameters gradually decreasing from inside to outside. The blades 15f comprise an upper side plate 15f-1, a lower side plate 15f-2 and an end plate 15f-4, the end plate 15f-4 is close to the wall surface of the inner shell 15c, oil discharge holes are formed in the end plate 15f-4, the lower side plate 15f-2 is of a porous structure with holes, the upper side plate 15f-1 is of a closed structure without holes, an adsorption layer 15f-3 is arranged inside the blades 15f, the adsorption layer 15f-3 is located in a space among the upper side plate 15f-1, the lower side plate 15f-2 and the end plate 15f-4, the adsorption layer 15f-3 is a multi-layer oil absorption cotton felt with holes, and the upper side plate 15f-1, the lower side plate 15f-2 and the end plate 15f-4 are all polytetrafluoroethylene plates.
The oil removal transmission belt 8 is composed of an outer oil absorption layer 8a, an oil storage layer 8b and an inner oil absorption layer 8c from outside to inside in sequence, the outer oil absorption layer 8a is used for being in contact with oil on the diaphragm, the outer oil absorption layer 8a is of a carbon fiber layer porous structure, the oil storage layer 8b is of a multi-layer oil absorption cotton felt with holes, and the inner oil absorption layer 8c is of a carbon fiber reinforced porous structure. The frame 5 comprises a connecting rod bracket 5h, a roller bearing seat 5i is arranged on the connecting rod bracket 5h, a roller shaft 5j is arranged on the bearing roller bearing seat 5i, the oil removing transmission roller 6 is fixed on a roller shaft 5j, a nut seat 5e is fixed at the lower part of the connecting rod bracket 5h, a vertically arranged screw rod 5d is arranged on the internal thread of the nut seat 5e, an adjusting motor 5a is arranged at the position, below the roller shaft 5j, of the rack 5h, a transmission shaft 5b which is horizontally arranged is connected to the output end of the adjusting motor 5a, a 90-degree commutator 5c is installed at the end of the transmission shaft 5b, the output end of the 90-degree commutator 5c is fixedly connected with the lower end of the lead screw 5d, and when the adjusting motor 5a drives the lead screw 5d to rotate through the transmission shaft 5b and the 90-degree commutator 5c, the nut seat 5e drives the connecting rod support 5h to move up and down along the lead screw 5 d.
And a heating mechanism in the oil squeezing roller is connected with a temperature control mechanism. The rear part of the front-end roller is connected with a speed feedback mechanism. The front-end roller 1 and the rear-end roller 18 respectively comprise three rollers, two rollers are positioned below and one roller is positioned above; the oil squeezing roller sets 9 on each oil removing transmission belt 8 are provided with three groups, and the three oil squeezing roller sets 9 are positioned in the middle of the oil removing transmission belt 8.
3 front-end rollers 3 form a staggered roller group with tension partition effect, which is used for isolating the tension of a diaphragm in a front-end process device and reducing the influence on the diaphragm tension of the front-end device, the rear part of the front-end rollers is provided with a speed feedback mechanism, an oil removing transmission belt 8 is positioned at the upper side and the lower side of the diaphragm behind the speed feedback mechanism, a driving motor 5k drives an oil removing transmission roller 6 to rotate, the oil removing transmission roller 6 drives the oil removing transmission belt 8 to move, an oil squeezing roller group 9 is positioned in the middle of the oil removing transmission belt 8 and is used for extruding and evaporating oil absorbed by the oil removing transmission belt, an oil collecting tank below the oil squeezing roller group is used for collecting the oil, the two oil removing transmission belts 8 are arranged in an up-and-down symmetrical way, two exhaust hoods 11 are respectively and symmetrically arranged, each exhaust hood positioned above can be provided with a suspension lock, the lower part of each exhaust hood positioned below can be adjustably supported, thereby changing the gap between each exhaust hood 11 and the oil removing transmission belt 8, the exhaust hood 11 is connected with the oil removal exhaust fan 15 through a flexible exhaust pipe 12 and a filtering channel 13, a liquid collecting disc and an overflow pipe are arranged below an oil filtering plate, and oil intercepted by the filtering channel can be discharged into an oil collecting tank 16; a liquid discharge pipe 15g at the lower part of the exhaust fan 15 is communicated with an oil collecting tank 16 to discharge oil in a cavity between the inner shell and the outer shell, an exhaust pipe 17 arranged at the upper part of the oil collecting tank leads gas in the exhaust fan 15 out, and rear-end rollers 18 which are arranged behind the oil removing driving roller 6 at the rear end and have a tension separating function in a staggered mode are arranged to separate the diaphragm tension of the rear-end process device and reduce the influence on the diaphragm tension in the rear-end process device.
In the embodiment, the gap between the oil removing transmission belt 8 and the oil-containing diaphragm which are symmetrically arranged up and down is adjusted through the frame of the oil removing transmission roller, the adjusting motor 5a drives the transmission shaft to rotate, the transmission shaft 5b drives the 90-degree commutators 5c at two ends to rotate, the 90-degree commutators 5c synchronously drive the screw rod 5d to rotate, as the screw rod 5d and the nut seat 5e form a thread pair, and the nut seat 5e is fixedly connected with the connecting rod bracket 5h, when the screw rod 5d rotates, the nut seat drives the connecting rod bracket to move up and down along the screw rod, so that the film surface of the oil removing transmission roller and the diaphragm is changed, the screw rod adopts the precise screw rod 5d, the gap inside the oil removing transmission belt 8 which is arranged up and down can be precisely adjusted within the range of 0-100mm, the precision is 1mm, and the contact distance between the oil-containing diaphragm is controlled.
The speed feedback mechanism controls the speed of the oil removing transmission roller through detecting the running speed of the diaphragm behind the front-end roller in real time and controlling the speed of the oil removing transmission roller through a servo control system, so that synchronous speed difference-free contact between micro-tension of the oil removing transmission belt and the oil-containing diaphragm is ensured.
The upper and lower crowded oil roller of the crowded oil roller set at upper and lower symmetrical arrangement's deoiling drive belt middle part is current deoiling drive belt (8) between the upper and lower crowded oil roller, through the upper and lower roller clearance of the crowded oil roller set of adjustment, clearance control range is 0 ~ 100mm, the roller temperature of each crowded oil roller is regulated and control alone to accessible temperature control mechanism, control by temperature change control range is 30 ~ 150 ℃, extrude the deoiling drive belt through the upper and lower roller interval that sets up crowded oil roller set, and through each roller temperature of the crowded oil roller set of control, can effective control the temperature of deoiling drive belt, and then white oil that effectively evaporation oiliness diaphragm was smugglied secretly, evaporation oil gas mixture is discharged by deoiling exhaust fan (17).
The oil removing transmission belts which are symmetrically arranged up and down adopt a multi-layer porous flexible structure, the outer oil absorption plate 8a adopts a carbon fiber layer porous structure, and the thickness is 2-10 mm; the oil storage layer is positioned in the middle, the number of the oil storage layer is at least 3, the oil storage layer is made of porous oil absorption cotton felt, and the thickness of the oil storage layer is 10-50 mm; the inner side of the oil storage layer is an inner oil absorption plate 8c which is of a carbon fiber reinforced structure.
The exhaust hood 11 arranged above and below the oil removing transmission belt is communicated with the exhaust fan 15 through the flexible air pipe 12, the outer oil suction plate 8a of the oil removing transmission belt 8 positioned below is a low-pressure side, the inner oil suction plate 8c is a high-pressure side, and the oil removing transmission belt 8 positioned below generates flowing power from top to bottom by the gravitational potential energy and the exhaust pressure together. The flow direction power of the oil-gas mixture is changed by adjusting the frequency 15 of the exhaust fan and the height of the exhaust hood 11.
An oil filter plate 13a which can be conveniently replaced is arranged in a filtering channel 13 at the front end of the exhaust fan, a liquid collecting disc 13b is arranged at the lower part of the filtering channel and is connected to an oil collecting tank 15g through an overflow pipe 14, a gas-liquid mixture pumped out by the exhaust fan is filtered through the oil filter plate 13a and enters the inner side of an inner shell 15c through an inlet pore plate 15b on an outer shell of the exhaust fan 1, a sandwich structure with a cavity is arranged between the outer shell 15a and the inner shell 15c, the inlet pore plate 15b is used as an air suction inlet of the fan, a blade 15f in the shell throws sucked oil into the cavity between the outer shell 15a and the inner shell 15c by adopting centrifugal force, the oil enters the cavity between the outer shell and the inner shell through an oil penetrating hole, the oil flows to the bottom of the cavity under the action of gravity, an oil discharging pipe is arranged at the lower part of the outer shell 15a and is communicated with the oil collecting tank 19, the oil penetrating hole on the wall surface of the inner shell 15c is a conical hole with the inner side of 2-5 mm and the outer side of 0.5-1 mm, the liquid drops are collected into a cavity between the outer shell and the inner shell, and meanwhile, the conical oil penetration hole can increase the pressure difference of oil on two sides of the inner shell and reduce splashing reflux of the oil entering the interlayer.
Blades of the fan are symmetrically arranged on the rotating shaft, an upper side plate 15f-1 of each blade 15f is a light plate with a closed non-porous structure, a corrosion-resistant and high-temperature-resistant plate with polytetrafluoroethylene on the surface is adopted, a lower side plate 15f-3 is a polytetrafluoroethylene plate with holes with the diameter of 1-2 mm, an adsorption layer 15f-2 is a porous oil absorption cotton felt, holes with the diameter of 1-5 mm are formed in an end plate 15f-4, the rotating shaft 5e is driven by the variable frequency motor to rotate and drive the blades 15f to rotate at a high speed, oil in an oil-gas mixture is absorbed, and the absorbed oil flies out from the holes in the end plate under the action of centrifugal force, so that periodic oil absorption and discharge work is completed.
The following analysis of the oil removal effect of the present invention is illustrated with reference to specific practical examples:
example 1:
in the production process of the wet lithium battery diaphragm casting piece, the outlet oil-containing diaphragm runs at the linear speed of 700mm in width, 1.5mm in thickness and 7 m/min: set up deoiling drive belt width 720mm, linear velocity 7m/min, exhaust fan amount of wind 1000 m/h, the top wind pressure-300 pa of the deoiling drive belt that is located the top, deoiling drive belt thickness 20mm (the thick 5mm of outer oil absorption board, oil storage layer is thick 10mm, the thick 5mm of interior oil absorption board), crowded oily roller set temperature sets up to 80 ℃, and diaphragm drive speed is 7m/min, and the roller interval of crowded oily roller sets up to 15mm from top to bottom.
The oil removal effect of the oil-containing diaphragm is detected by sampling and weighing, a statistical table shown in figure 7 is used for detecting the oil removal effect, the weight of a cast sheet film before oil removal is sampled under the condition that the thickness of the oil-containing diaphragm detected by a thickness detector is uniform through result analysis in figure 7, the same number of samples are taken for the oil-removed diaphragm, the weight ratio before and after oil removal is counted by multiple times of sampling, and the oil removal rate is about 15%.
Example 2:
in the wet-process lithium battery diaphragm biaxial stretching process, the width of an outlet oil-containing diaphragm is 4500mm, the thickness is 30 microns, and the linear speed of 50m/min is as follows: set up deoiling drive belt breadth 4500mm, linear velocity 50m/min, exhaust fan amount of wind 3000 m/h, the top wind pressure-350 pa of the deoiling drive belt that is located the top, deoiling drive belt thickness 15mm (outer oil absorption plate is thick 2.5mm, oil reservoir 10mm, interior oil absorption plate 2.5mm is thick), the crowded oily roller set temperature is set for 60 ℃, linear velocity 5m/min, the roller interval of crowded oily roller sets for 10mm from top to bottom.
The table in fig. 8 is a table showing that after the oil removal system of the present invention is used, statistics on the oil removal effect of the membrane after biaxial stretching is performed, statistics on the oil removal effect is performed by comparing the concentrations of white oil of the sample after being soaked in the single extraction liquid vessel, 10 groups of dichloromethane test solutions with the purity of 99.9% are passed, wherein 5 groups collect the concentration of dichloromethane before oil removal, and the other 5 groups collect the concentration of dichloromethane after oil removal, and the oil removal rate is at most 30% or more.
The above-mentioned embodiments are only specific embodiments for further detailed description of the technical solutions of the present invention, and are only specific embodiments of the present invention, and any person skilled in the art who is skilled in the art can substitute or change the technical solutions of the present invention and the inventive concept within the technical scope of the present invention, and all the equivalent alternatives or modifications are included in the scope of the present invention claimed.
Claims (10)
1. The utility model provides a wet process lithium cell is deoiling system for diaphragm which characterized in that: the oil removing device comprises a transmission assembly, two oil removing assemblies and an oil collecting assembly, wherein the transmission assembly comprises a front end roller and a rear end roller which drive a diaphragm to transversely drive, the front end roller and the rear end roller are parallel to a horizontal plane, the two oil removing assemblies are respectively positioned on the upper side and the lower side of the diaphragm between the front end roller and the rear end roller, each oil removing assembly comprises a rack, two oil removing transmission rollers which are installed on the rack and an oil removing transmission belt which is wound on the two oil removing transmission rollers, the oil removing transmission belt is parallel to the diaphragm and is made of an oil absorbing material with a porous structure, a gap for the diaphragm to pass through is formed between the oil removing transmission belts of the two oil removing assemblies, each oil removing transmission belt is provided with a near section close to the diaphragm and a far section far from the diaphragm, the oil collecting assembly comprises an oil squeezing roller group and an exhaust fan, the exhaust fan comprises a shell, a rotating shaft positioned in the shell and blades which rotate under the driving of the rotating shaft, the casing includes inner shell and shell, the cavity has between inner shell and the shell, oil through hole has been seted up on the inner shell wall, be connected with the row oil pipe on the shell bottom surface, be connected with the sump oil tank on arranging the oil pipe, be connected with the blast pipe on the sump oil tank, crowded oil roller group is including setting up the crowded oil roller of both sides about the far-end of deoiling drive belt respectively, install heating mechanism in the crowded oil roller, the below of crowded oil roller is equipped with the oil sump, the top of the crowded oil roller group of the deoiling drive belt of diaphragm top, the below of the crowded oil roller group of the deoiling drive belt of diaphragm below is equipped with the exhaust hood respectively, the exhaust hood passes through the cavity intercommunication of exhaust pipe and exhaust fan casing.
2. The oil removing system for the separator of the wet lithium battery as claimed in claim 1, wherein: the fan filter is characterized in that a filtering channel is fixed on the outer side of the fan shell, one end of the filtering channel is communicated with the exhaust pipe, the other end of the filtering channel is communicated with the inner portions of the inner shell and the outer shell, an oil filtering plate is arranged in the filtering channel, an inlet pore plate is arranged at the joint of the filtering channel and the outer shell, a liquid collecting disc is arranged at the bottom in the filtering channel, an overflow pipe is connected onto the liquid collecting disc, and the overflow pipe leads into the oil collecting tank.
3. The oil removing system for the separator of the wet lithium battery as claimed in claim 1, wherein: the blade includes epipleural, lower plate and end plate, and the end plate is close to the inner shell wall, has seted up the oil extraction hole on the end plate, and the porous structure of lower plate for having the trompil, epipleural be the enclosed construction that does not have the trompil, the inside adsorbed layer that has of blade, the adsorbed layer is located the space between epipleural, lower plate and the end plate, and the adsorbed layer is the porous multilayer oil absorption cotton felt that has the porose, and epipleural, lower plate and end plate are the polytetrafluoroethylene board.
4. The oil removing system for the separator of the wet lithium battery as claimed in claim 1, wherein: the oil penetrating holes are uniformly distributed on the wall surface of the inner shell, and the oil penetrating holes are tapered holes with diameters gradually reduced from inside to outside.
5. The oil removing system for the separator of the wet lithium battery as claimed in claim 1, wherein: the oil removal transmission belt sequentially comprises an outer oil absorption layer, an oil storage layer and an inner oil absorption layer from outside to inside, the outer oil absorption layer is used for contacting oil on the diaphragm, the outer oil absorption layer is of a carbon fiber layer porous structure, the oil storage layer is a multi-layer oil absorption cotton felt with holes, and the inner oil absorption layer is of a carbon fiber reinforced porous structure.
6. The oil removing system for the separator of the wet lithium battery as claimed in claim 1, wherein: the frame includes the connecting rod support, installs the roller bearing frame on the connecting rod support, installs the roller axle on the bearing roller seat, the deoiling driving roller is fixed on the roller axle, the connecting rod support lower part is fixed with the nut seat, and the lead screw of vertical setting is installed to nut seat internal thread, the below position department that lies in the roller axle in the frame is equipped with adjusting motor, is connected with the transmission shaft that the level set up on adjusting motor's the output, and 90 commutators are installed to the tip of transmission shaft, and 90 commutators's output and the lower extreme fixed connection of lead screw, when adjusting motor passed through the transmission shaft, 90 commutator drive lead screw rotates, the nut seat drives the connecting rod support and reciprocates along the lead screw.
7. The oil removing system for the wet lithium battery separator according to claim 1, wherein: and a heating mechanism in the oil squeezing roller is connected with a temperature control mechanism.
8. The oil removing system for the wet lithium battery separator according to claim 1, wherein: the rear part of the front-end roller is connected with a speed feedback mechanism.
9. The oil removing system for the wet lithium battery separator according to claim 1, wherein: the front-end roller and the rear-end roller respectively comprise three rollers, two rollers are positioned below and one roller is positioned above the three rollers; the oil squeezing roller sets on each oil removing transmission belt are respectively provided with three sets, and the three oil squeezing roller sets are positioned in the middle of the oil removing transmission belt.
10. The oil removing system for the wet lithium battery separator according to claim 1, wherein: the exhaust pipe is a flexible pipeline; and the top of the exhaust pipe is provided with a blast cap.
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| CN202210427380.1A CN114759310B (en) | 2022-04-22 | 2022-04-22 | Oil removal system for wet lithium battery diaphragm |
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| CN202210427380.1A CN114759310B (en) | 2022-04-22 | 2022-04-22 | Oil removal system for wet lithium battery diaphragm |
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| CN114759310B CN114759310B (en) | 2023-05-23 |
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|---|---|
| CN114759310B (en) | 2023-05-23 |
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Effective date of registration: 20230613 Address after: Room 202, Office Building 6, No. 11, Jinwen Road, Binjiang Economic Development Zone, Jiangning District, Nanjing, Jiangsu 211100 Patentee after: Zhongcai Lithium Film (Nanjing) Co.,Ltd. Address before: No. 368, Shunhe West Road, Tengzhou Economic Development Zone, Zaozhuang City, Shandong Province 277500 Patentee before: SINOMA LITHIUM FILM Co.,Ltd. |
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