CN114122309B - Dry electrode preparation method and battery production line - Google Patents
Dry electrode preparation method and battery production line Download PDFInfo
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- CN114122309B CN114122309B CN202111196158.7A CN202111196158A CN114122309B CN 114122309 B CN114122309 B CN 114122309B CN 202111196158 A CN202111196158 A CN 202111196158A CN 114122309 B CN114122309 B CN 114122309B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 97
- 239000000047 product Substances 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 239000011265 semifinished product Substances 0.000 claims abstract description 29
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 24
- 238000010030 laminating Methods 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 49
- 238000005098 hot rolling Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000005097 cold rolling Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
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- 230000009286 beneficial effect Effects 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
Abstract
The invention provides a dry electrode preparation method and a battery production line, which comprise preforming treatment, wherein mixed raw materials are subjected to preforming treatment, so that a semi-finished dry electrode film with self-supporting property is formed by the mixed raw materials; carrying out delay press treatment, namely carrying out delay press treatment on the semi-finished product dry electrode film to enable the semi-finished product dry electrode film to form a finished product dry electrode film; and synthesizing a finished product dry electrode, and rolling and laminating the finished product dry electrode film and a current collector to form the finished product dry electrode. The mixed raw materials are preformed to form a semi-finished product dry electrode film with self-supporting property, and then the finished product dry electrode film is formed through the delay press treatment, and the finished product dry electrode film and a current collector are rolled to form a finished product dry electrode, so that the problem that the electrode film is easy to break in the preparation process is effectively solved, the semi-finished product dry electrode film is not required to be rolled for multiple times, the rolling times are reduced, and the manufacturing efficiency of the dry electrode is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a dry electrode preparation method and a battery production line.
Background
The electrode is the key for determining the energy density and the cycle performance of the battery, the traditional electrode manufacturing process is a wet coating manufacturing process, and the general process is as follows: stirring, homogenizing, coating, drying, roll forming, slitting and tabletting. The stirring and homogenizing process and the coating and drying process are lengthy, and the equipment requirement and the occupied area of a factory building are large, so that great waste is caused, and the stirring and homogenizing process needs to utilize a specific solvent (NMP), which is toxic, needs to be recovered, purified and reused, and needs huge, expensive and complex recovery equipment. Thus, dry electrode technology is beginning to be increasingly employed in the art.
The dry electrode technology is to mix electrode active material, conductive agent and adhesive to obtain electrode powder without using any solvent; and then manufacturing the electrode powder material with high pressure (extruder) to form a thin electrode material strip, and pressing the formed electrode material strip onto a metal foil current collector to form a finished electrode. The electrode powder is directly extruded, and belt breakage easily occurs in the extrusion process, so that the subsequent process is influenced; the thickness of the electrode to be manufactured is large enough to ensure that the finished electrode is not easy to break, but the power performance of the battery core and the like can be influenced by the excessive thickness of the electrode, and if the electrode is rolled to the required thickness, a plurality of rolling procedures are needed to realize, so that the finished electrode is easy to break in the rolling process.
Disclosure of Invention
The invention provides a dry electrode preparation method and a battery production line, which are used for solving the defects that the subsequent process is easily affected by breakage in the process of directly extruding electrode powder into a finished electrode or the power performance of a battery core is affected by overlarge thickness of a finished dry electrode film manufactured in the prior art, forming a semi-finished dry electrode film with self-supporting property by performing preforming treatment on mixed raw materials, forming the finished dry electrode film by performing extension press treatment, and synthesizing the finished dry electrode film and a current collector into the finished dry electrode by rolling, thereby effectively solving the problem that the electrode film is easy to break in the preparation process, avoiding multiple rolling, reducing the rolling times and improving the manufacturing efficiency of the dry electrode.
The invention provides a dry electrode preparation method, which comprises the following steps:
preforming, namely preforming the mixed raw materials to form a semi-finished product dry electrode film with self-supporting property;
carrying out delay press treatment, namely carrying out delay press treatment on the semi-finished product dry electrode film to enable the semi-finished product dry electrode film to form a finished product dry electrode film;
and synthesizing a finished product dry electrode, and rolling and laminating the finished product dry electrode film and a current collector to form the finished product dry electrode.
According to the dry electrode preparation method provided by the invention, the synthesis of the finished dry electrode further comprises judging whether a device for synthesizing the finished dry electrode has faults or not;
if yes, the delay device for forming the finished dry electrode film conveys the finished dry electrode film to the temporary storage device;
if not, the delay pressing device for forming the finished dry electrode film conveys the finished dry electrode film into the device for synthesizing the finished dry electrode.
According to the dry electrode preparation method provided by the invention, the preforming treatment comprises the following steps: performing two-stage compression treatment on the mixed raw materials, and extruding to form the semi-finished product dry electrode film;
or, carrying out primary extrusion and vibration extrusion treatment on the mixed raw materials, and extruding to form the semi-finished product dry electrode film;
or, carrying out paving treatment and flattening treatment on the mixed raw materials to form the semi-finished product dry electrode film.
According to the dry electrode preparation method provided by the invention, the delay press treatment comprises the following steps:
carrying out hot rolling treatment on the semi-finished product dry electrode film;
and carrying out cold rolling treatment on the semi-finished product dry electrode film subjected to hot rolling to form the finished product dry electrode film.
According to the dry electrode preparation method provided by the invention, the synthetic finished dry electrode comprises the following components:
hot rolling and laminating the finished dry electrode film and a current collector to form an initial electrode;
and cold rolling and shaping the initial electrode to form the finished dry electrode.
According to the dry electrode preparation method provided by the invention, the synthetic finished dry electrode further comprises: and before the initial electrode is formed, a small amount of adhesive is smeared on the joint surface of the finished dry electrode film and the joint surface of the current collector.
According to the dry electrode preparation method provided by the invention, the synthetic finished dry electrode further comprises: and before a small amount of adhesive is smeared on the bonding surface of the finished dry electrode film and the bonding surface of the current collector, roughening the bonding surface of the finished dry electrode film and the bonding surface of the current collector.
According to the dry electrode preparation method provided by the invention, the delay press treatment further comprises the following steps: and cutting off the residual edge of the finished dry electrode film.
According to the dry electrode preparation method provided by the invention, in the synthetic finished dry electrode, the finished dry electrode films above and below a current collector are simultaneously adhered to the current collector;
or, after the finished dry electrode film positioned above is attached to the upper surface of the current collector, the finished dry electrode film positioned below is attached to the lower surface of the current collector;
or after the finished dry electrode film positioned below is attached to the lower surface of the current collector, the finished dry electrode film positioned above is attached to the upper surface of the current collector.
The invention also provides a battery production line, which comprises a dry electrode preparation device, wherein the dry electrode preparation device is used for preparing a finished dry electrode by using the dry electrode preparation method.
According to the dry electrode preparation method and the battery production line, the mixed raw materials can be pretreated through the preforming treatment procedure to obtain the semi-finished dry electrode film with self-supporting property, so that the belt breakage is not easy to occur in the manufacturing process, and the belt breakage problem caused by direct rolling is solved; the semi-finished product dry electrode film is rolled into a finished product dry electrode film through a rolling procedure, multiple rolling is not needed, and the rolling times are reduced; the finished dry electrode can be quickly synthesized through the process of synthesizing the finished dry electrode, and the manufacturing efficiency of the dry electrode is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a dry electrode preparation method provided by the invention;
FIG. 2 is a schematic flow chart of a synthetic finished dry electrode provided by the present invention;
FIG. 3 is a schematic flow chart of a preforming process provided by the present invention;
FIG. 4 is a second schematic flow chart of the preforming process provided by the present invention;
FIG. 5 is a third schematic flow chart of the preforming process provided by the present invention;
FIG. 6 is a schematic flow chart of the flattening process provided by the present invention;
FIG. 7 is a second schematic flow chart of the flattening process according to the present invention;
FIG. 8 is a schematic flow chart of the delay press treatment provided by the invention;
FIG. 9 is a schematic diagram of a dry electrode film forming apparatus according to the present invention;
FIG. 10 is a second schematic diagram of a dry electrode film forming apparatus according to the present invention;
FIG. 11 is a third schematic diagram of a dry electrode film forming apparatus according to the present invention;
FIG. 12 is a schematic diagram showing the structure of a dry electrode film forming apparatus according to the present invention.
Reference numerals:
1: a pressure-spreading device; 11: a mixing device; 12: a first stage compression device;
13: a rotary cutting device; 14: a conveying device; 15: a secondary compression device;
16: an extrusion device; 21: a feeding mechanism; 22: a feeding mechanism;
23: an extrusion chamber; 24: a vibrating inner sleeve; 31: a feeding device;
32: a feeding device; 33: a conveying workbench; 34: a material distribution device;
35: a rolling mechanism; 36: a vibration pressing mechanism; 37: ironing mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The dry electrode manufacturing method of the present invention is described below with reference to fig. 1 to 12.
The dry electrode preparation method provided by the invention comprises the following steps:
step S1, performing, namely performing the mixed raw materials to form a semi-finished product dry electrode film with self-supporting property;
in actual operation, the mixed raw material is preformed by a preforming treatment device into a semi-finished dry electrode film having self-supporting properties.
Step S2, carrying out delay press treatment, namely carrying out delay press treatment on the semi-finished product dry electrode film to form a finished product dry electrode film;
wherein, the semi-finished dry electrode film is processed into the finished dry electrode film by the delay device 1.
And S4, synthesizing a finished product dry electrode, and rolling and laminating the finished product dry electrode film and a current collector to form the finished product dry electrode.
According to the dry electrode preparation method provided by the invention, the mixed raw materials can be pretreated through the preforming treatment procedure to obtain the semi-finished dry electrode film with self-supporting property, so that the belt is not easy to break in the manufacturing process, and the belt breakage problem caused by direct rolling is solved; the semi-finished dry electrode film is rolled into a finished dry electrode film through a rolling treatment procedure, multiple rolling is not needed, and the rolling times are reduced; the finished dry electrode can be quickly synthesized through the process of synthesizing the finished dry electrode, and the manufacturing efficiency of the dry electrode is improved.
In a first embodiment of the present invention, as shown in fig. 3, the preforming process may include: and carrying out two-stage compression treatment on the mixed raw materials, and extruding to form a semi-finished product dry electrode film.
Specifically, the preforming process includes:
step S112, performing primary compression treatment on the mixed raw materials to compress the mixed raw materials into a solidified state;
step S115, performing secondary compression treatment on the mixed raw materials to compress the solidified mixed raw materials into raw material blocks;
and step S116, extruding the raw material blocks to form a semi-finished dry electrode film.
Wherein, prior to step S115, the preforming process further includes:
step S113, rotary-cutting the solidified mixed raw material into small solidified raw materials;
step S114, the small pieces of solidified material are transported to a device for performing secondary compression processing on the mixed material.
And, before the first-stage compression treatment is performed on the mixed raw material, the preforming treatment further includes step S111, and the fibrillated mixed raw material is fully mixed to achieve the homogenization effect.
Specifically, as shown in fig. 9, the preforming processing apparatus includes a mixing apparatus 11, a first-stage compression apparatus 12 for performing a first-stage compression process on the mixed raw material, a rotary cutting apparatus 13 for rotary-cutting the solidified mixed raw material, a conveying apparatus 14, a second-stage compression apparatus 15 for performing a second-stage compression process on the mixed raw material, and an extrusion apparatus 16 for extruding a raw material block, which are sequentially disposed, wherein the mixing apparatus 11 may include two stirring shafts to improve mixing efficiency; the first-stage compression device 12 and the second-stage compression device 15 each include an extrusion cavity and a screw device, the first end of the extrusion cavity is provided with a feed inlet, the second end is provided with a discharge outlet, the screw device is used for extruding mixed raw materials from the first end to the second end of the extrusion cavity, the volume of the extrusion cavity is gradually reduced along the direction from the first end to the second end of the extrusion cavity (i.e., the extrusion direction), the cavity of the extrusion device 16 can be in a circular truncated cone structure, and the diameter of the cavity of the extrusion device 16 is gradually reduced from the feed end to the discharge end (extrusion direction) of the extrusion device 16. In actual operation, the mixing device 11 fully mixes the mixed raw materials, conveys the mixed raw materials into the first-stage compression device 12, the mixed raw materials are primarily compressed into solidified mixed raw materials by the first-stage compression device 12, conveyed into the rotary cutting device 13 by the spiral device of the first-stage compression device 12, rotary-cut into small solidified raw materials by the rotary cutting device 13, the small solidified raw materials enter the conveying device 14 and conveyed into the second-stage compression device 15 by the conveying device 14, compressed into raw material blocks by the second-stage compression device 15, and the raw material blocks enter the extrusion device 16 and are extruded into semi-finished dry electrode films.
In a second embodiment of the present invention, as shown in fig. 4, the preforming process may include: and carrying out primary extrusion and vibration extrusion treatment on the mixed raw materials, and extruding to form a semi-finished dry electrode film.
Specifically, the preforming process includes:
step S123, performing primary extrusion treatment on the mixed raw materials;
step S124, vibration extrusion is carried out on the mixed raw materials;
and step S125, extruding the mixed raw materials to form a semi-finished dry electrode film.
In actual operation, as shown in fig. 10, the pre-forming treatment device includes an extrusion cavity 23, where a first end of the extrusion cavity 23 is provided with a feed port, and a second end of the extrusion cavity is provided with a discharge port, and a screw device for extruding the mixed raw material from the first end to the second end of the extrusion cavity 23, so as to perform primary extrusion treatment on the mixed raw material. The preforming device further comprises a vibrating inner sleeve 24 arranged in the extrusion cavity 23, wherein the vibrating inner sleeve 24 can vibrate along the extrusion cavity 23 perpendicular to the extrusion direction so as to perform vibrating extrusion on the mixed raw materials; and then extruding the mixed raw materials from a discharge hole under the conveying action of a screw device to form a semi-finished product dry electrode film.
Also, along the direction from the first end to the second end of the extrusion chamber 23 (i.e., the extrusion direction), the volume of the extrusion chamber 23 is gradually reduced, for example, the inner wall surface of the extrusion chamber 23 may be provided in a truncated cone structure, the diameter of which is gradually reduced along the extrusion direction; either the diameter of the shaft of the screw in the extrusion direction is gradually increased or the diameter of the blades of the screw in the extrusion direction is gradually increased. Thus, the internal space of the extrusion cavity 23 is gradually reduced, so that the extrusion force of the mixed raw materials along with the conveying of the screw device is gradually increased, a better extrusion effect is formed, and the self-supporting property of the dry electrode film formed after extrusion is further improved.
In a second embodiment of the present invention, as shown in fig. 4, the preforming process further includes:
step S121, stirring the mixed raw materials;
step S122, the stirred mixed raw material is fed into the extrusion chamber 23.
Specifically, the preforming processing device further comprises a feeding mechanism 21 and a feeding mechanism 22, wherein a stirring device for stirring mixed raw materials is arranged inside the feeding mechanism 21, a discharge hole of the feeding mechanism 21 is communicated with a feed hole of the feeding mechanism 22, and a discharge hole of the feeding mechanism 22 is communicated with a feed hole of the extrusion cavity 23. In actual operation, the stirring device stirs the mixed raw material in the feeding mechanism 21, and the mixed raw material enters the feeding mechanism 22, and is fed into the extrusion chamber 23 by the feeding mechanism 22. Here, the feeding mechanism 22 may be a screw conveyor or a scraper conveyor.
In a third embodiment of the present invention, as shown in fig. 5, the preforming process may include: and (3) carrying out spreading treatment and flattening treatment on the mixed raw materials to form a semi-finished product dry electrode film.
Specifically, the preforming process includes:
step S133, flattening the mixed raw materials to form a raw material layer with a preset thickness and a preset width;
and step S134, flattening the raw material layer to form a semi-finished dry electrode film.
In step S133, the mixed raw material is subjected to flattening treatment by the distributing device 34, so that the mixed raw material forms a raw material layer having a preset thickness and a preset width.
Specifically, the pre-forming treatment device comprises a conveying workbench 33 and a distributing device 34, wherein the distributing device 34 is arranged above the conveying workbench 33, the distributing device 34 is arranged close to the feeding end of the conveying workbench 33, and the distributing device 34 can move the mixed raw materials piled on the conveying workbench 33 to two sides of the conveying workbench 33 so as to flatten the raw material layers with preset thickness and preset width.
Wherein the distributing device 34 comprises a screw blade shaft and a distributing drive for driving the screw blade shaft to rotate, and the distributing drive can be a motor. The axis of the spiral blade shaft is perpendicular to the conveying direction of the conveying workbench 33, the cloth drives the spiral blade shaft to rotate, and mixed raw materials can be driven to move towards two sides of the conveying workbench 33, so that the mixed raw materials are flattened on the table top of the conveying workbench 33 to form a raw material layer, the thickness uniformity of a formed finished dry electrode is ensured, and the breakage probability of a finished dry electrode film can be reduced. Here, the length of the helical blade shaft may coincide with the width of the table surface of the conveying table 33.
The screw blade shaft may include one or more sets of coaxially and symmetrically disposed screw blades, each set of screw blades having opposite rotation directions, so that the screw blades can spread the intermediate mixed raw material toward both sides of the conveying table 33. Specifically, each set of helical blades comprises two coaxially symmetrically arranged helical blades. Wherein, a plurality of groups of spiral blades can be arranged on the same shaft lever and driven and controlled by one cloth. The spiral blade shaft can only comprise a group of spiral blades, and the two spiral blades can be respectively arranged on the two shaft rods and driven and controlled by two cloth materials, and the two cloth materials drive and control the two shaft rods to rotate in the same direction; the screw blade shaft may comprise only one set of screw blades, which are controlled separately by two cloth drives, i.e. the cloth device 34 comprises two shaftless screw distributors.
The step S133 may include:
adjusting the spacing between the helical blade shaft and the transport table 33;
the helical blade shaft spreads the mixed raw materials.
Wherein the distance between the screw blade shaft and the transport table 33 can be adjusted by means of a cloth lifting device. Specifically, the cloth lifting device is arranged on a bracket of the cloth device 34, the cloth lifting device can be a screw nut device, the cloth drive is fixedly connected with a nut of the screw nut device, the axial direction of a screw of the screw nut device is perpendicular to the table surface of the conveying workbench 33, two opposite sliding grooves are arranged on the bracket of the cloth device 34, two ends of the screw blade shaft can respectively move up and down along the sliding grooves, and the cloth drive can drive the screw blade shaft to rotate in the sliding grooves. Thus, the motor of the screw-nut device drives the screw to rotate, so that the nut drives the motor and the screw blade shaft to move up and down, and the distance between the screw blade shaft and the table top of the conveying workbench 33 is adjusted, so that the thickness and the width of the flattened raw material layer are adjusted. In other embodiments, the cloth lifting device may be an electric push rod, an air cylinder, a hydraulic cylinder, or the like, and the cloth driving device may be fixedly mounted at the telescopic end of the cloth lifting device.
And, flattening the raw material layer by a flattening device to form a semi-finished dry electrode film on the raw material layer.
Specifically, the preform processing device further includes a flattening device provided above the conveying table 33 and downstream of the distributing device 34 to flatten the raw material layer.
Wherein the flattening device may comprise a compacting mechanism provided with a compacting surface corresponding to the table surface of the transport table 33 for compacting the raw material layer and an ironing mechanism 37; the ironing mechanism 37 is provided with an ironing plane corresponding to the surface of the conveying table 33 for ironing the raw material layer. The compacting mechanism can be arranged at the upstream of the ironing mechanism 37, so that the raw material layer is firstly compacted by the compacting surface of the compacting mechanism and then is ironed by the ironing surface of the ironing mechanism 37 to form a semi-finished dry electrode film; the compacting means may also be arranged downstream of the ironing means 37, so that the raw material layer is firstly ironed by the ironing surface of the ironing means 37 and then compacted by the compacting surface of the compacting means to form a semi-finished dry electrode film. Here, the positions of the compacting mechanism and the ironing mechanism 37 are not particularly limited, and may be specifically determined according to actual conditions.
As shown in fig. 6 and 11, step S134 may include:
vibrating and pressing the raw material layer;
ironing the material layer after vibration pressing treatment.
The compacting mechanism may be a compacting mechanism 36, where the compacting mechanism 36 includes a compacting block for compacting the raw material layer, and the compacting surface is a bottom surface of the compacting block. And the compaction mechanism further comprises a vibration drive for driving the vibration block to vibrate up and down, wherein the vibration drive can be a vibration motor, an air cylinder or a hydraulic cylinder and is used for driving the vibration block to move up and down, so that the vibration block can compact the raw material layer downwards. Specifically, the vibration pressing mechanism 36 may include a vibration pressing block and a vibration driving, where the size of the vibration pressing block may be matched with the width of the conveying workbench 33, so as to ensure that the raw material layer on the conveying workbench 33 can be compacted by the vibration pressing block, which is beneficial to improving the self-supporting property of the semi-finished dry electrode film and ensuring the thickness uniformity of the semi-finished dry electrode film; the vibration pressing mechanism 36 may also include a plurality of vibration blocks and a vibration drive that simultaneously controls the plurality of vibration blocks, the plurality of vibration blocks being uniformly distributed along the width direction of the conveying table 33 to maximally compact the raw material layer on the conveying table 33, thereby improving the self-supporting property of the semi-finished dry electrode film and ensuring the uniformity of the thickness of the semi-finished dry electrode film.
As shown in fig. 7 and 12, step S134 may include:
rolling the raw material layer;
ironing the rolled raw material layer.
The compacting mechanism may also be a rolling mechanism 35, where the rolling mechanism 35 includes a rolling wheel for rolling the raw material layer to compact the raw material layer. Here, the compacting surface is an outer wall surface of the roller, and the raw material layer is compacted by cooperation of the outer wall surface of the roller and the conveying table 33. Specifically, the roller wheel may be a fixed wheel, the roller wheel may also be a rotating wheel, and the raw material layer may be conveyed to the next process only through the conveying workbench 33; the rolling mechanism 35 may further include a rotation drive for driving the rollers to rotate, and the rotation drive may also function to convey the raw material layer, and the rotation drive and the conveying table 33 cooperate to convey the raw material layer to the next process.
In a third embodiment of the present invention, as shown in fig. 5, the preforming process further includes:
step S131, temporarily storing the mixed raw materials to a discharging bin;
step S132, the mixed raw materials in the discharging bin are transferred to the transfer table 33.
In actual operation, the mixed raw materials are temporarily stored through a discharging bin of the feeding device 31, and the feeding amount is controlled by regulating and controlling the opening degree of a discharging valve at a discharging opening of the discharging bin; the mixed raw material is conveyed onto a conveying table 33 by a feeding device 32. The feeding device 32 may be a screw conveyor or a scraper conveyor, and the discharge opening of the discharging bin is disposed corresponding to the feed opening of the feeding device 32, and the discharge opening of the feeding device 32 is disposed corresponding to the feed end of the conveying table 33.
In an alternative embodiment of the invention, the delay press process comprises:
step S21, carrying out hot rolling treatment on the semi-finished product dry electrode film;
and S22, performing cold rolling treatment on the semi-finished product dry electrode film subjected to hot rolling to form a finished product dry electrode.
Specifically, the semi-finished dry electrode film is subjected to the delay treatment by the delay device 1, the delay device 1 comprises a hot roller and a cold roller which are sequentially arranged, and the semi-finished dry electrode film is subjected to the hot rolling treatment by the hot roller, so that the semi-finished dry electrode film is easier to roll to the required thickness. And (3) continuously carrying out cold rolling treatment on the semi-finished product dry electrode film subjected to hot rolling through a cold roller, reducing the temperature of the semi-finished product dry electrode film, and shaping the semi-finished product dry electrode film into a finished product dry electrode film with the required thickness.
In an alternative embodiment of the invention, as shown in fig. 2, the composite finished dry electrode comprises:
step S43, performing hot rolling lamination on the finished dry electrode film and a current collector to form an initial electrode;
and S44, performing cold roll forming on the initial electrode to form a finished dry electrode.
Specifically, in actual operation, the finished dry electrode film is hot-rolled and laminated with the current collector by a hot roller. And cold rolling and shaping the finished dry electrode film and the current collector by a cold roller.
In addition, in the synthetic finished product dry electrode, the finished product dry electrode films above and below the current collector are simultaneously attached to the current collector, so that the manufacturing time is reduced, and the production efficiency is improved.
Or after the finished dry electrode film positioned above is attached to the upper surface of the current collector, the finished dry electrode film positioned below is attached to the lower surface of the current collector.
Or after the finished dry electrode film positioned below is attached to the lower surface of the current collector, the finished dry electrode film positioned above is attached to the upper surface of the current collector.
In an alternative embodiment, as shown in fig. 1, the dry electrode preparation method further includes step S3: judging whether a device for synthesizing a finished product dry electrode has a fault or not;
if the fault occurs, the delay device for forming the finished dry electrode film conveys the finished dry electrode film to the temporary storage device;
if no fault occurs, the delay press device for forming the finished dry electrode film conveys the finished dry electrode film into the device for synthesizing the finished dry electrode.
In actual operation, when the device for synthesizing the finished dry electrode fails, the finished dry electrode film can be temporarily stored through the temporary storage device, so that the operation of the previous process (the process for manufacturing the finished dry electrode film) is not stopped.
When the device for synthesizing the finished product dry electrode is recovered to be normal, the temporary storage device conveys the temporarily stored finished product dry electrode film into the device for synthesizing the finished product dry electrode.
Specifically, the temporary storage device can be a winding and unwinding device, the winding and unwinding device can comprise a winding roller and a guide roller assembly used for guiding the finished dry electrode film, the winding roller can be arranged below the guide roller assembly, the guide roller assembly can be arranged between the delay device and the device used for synthesizing the finished dry electrode, the guide roller assembly comprises two guide rollers arranged side by side, and when the device used for synthesizing the finished dry electrode normally operates, the guide roller assembly can not operate, namely, the two guide rollers of the guide roller assembly do not rotate. When the device for synthesizing the finished dry electrode fails, the two guide rollers start to rotate to drive the finished dry electrode film to move downwards to the winding roller and to be wound by the winding roller; when the device for synthesizing the finished dry electrode is recovered to be normal, the winding roller is reversed to start unwinding, and the two guide rollers reversely rotate to drive the finished dry electrode film to move towards the finished dry electrode device.
It should be noted that, the electrode film cutting device may be further provided before the guide roller assembly, when the device for synthesizing the finished product dry electrode is recovered to be normal, the finished product dry electrode film conveyed by the delay device may be cut off, so that the finished product dry electrode film does not enter the winding and unwinding device any more, and the guide roller assembly is convenient to drive the finished product dry electrode film to move towards the finished product dry electrode device.
In an alternative embodiment, the composite finished dry electrode further comprises step S42: and before forming the finished dry electrode, applying a small amount of adhesive on the bonding surface of the finished dry electrode film and the bonding surface of the current collector. In this way, the finished dry electrode film and current collector can be bonded into a unitary structure.
In an alternative embodiment, the composite finished dry electrode further comprises step S41, wherein the bonding surface of the finished dry electrode film and the bonding surface of the current collector are roughened before applying a small amount of adhesive to the bonding surface of the finished dry electrode film and the bonding surface of the current collector. In this way, the contact area between the adhesive and the bonding surface of the finished dry electrode film and the bonding surface of the current collector is increased, so that the adhesive is easier to coat on the bonding surface of the finished dry electrode film and the bonding surface of the current collector.
In actual operation, the bonding surface of the finished dry electrode film and the current collector is roughened by a plasma method, a laser method or an ultrasonic rolling method.
In some embodiments, the delay press process further includes step S23, where the residual edge of the finished dry electrode film is subjected to a cutting process.
In actual operation, the residual edges of the finished dry electrode film are cut off by a trimming device arranged at the tail end of the delay press device 1, so that the finished dry electrode film with fixed specification is formed.
In an alternative embodiment, the preforming process further comprises: and mixing the raw material powder required by the dry electrode to form a mixed raw material.
And, the preforming treatment further includes a fiberizing treatment of the mixed raw material.
According to the dry electrode preparation method provided by the invention, the dry powder electrode mixture raw material can be treated in advance through the preforming treatment procedure to obtain the semi-finished dry electrode film with self-supporting property, and the semi-finished dry electrode film is subjected to the calendering treatment procedure to form the finished dry electrode film without multiple rolling, so that the rolling times are reduced; when the subsequent device for synthesizing the finished product dry electrode fails, namely one or more of the roughening treatment device, the gluing device and the electrode synthesizing and rolling device fails, the temporary storage device can temporarily store the finished product dry electrode film, ensure the normal operation of the procedure of preparing the electrode film in advance, and lead out the temporarily stored finished product dry electrode film into the roughening treatment device until the device for synthesizing the finished product dry electrode is recovered to be normal; the roughening treatment device is used for roughening the bonding surface of the finished dry electrode film and the bonding surface of the current collector, so that the contact area of the adhesive and the finished dry electrode film and the current collector is increased, the bonding of the finished dry electrode film and the current collector is facilitated, and the bonding of the finished dry electrode film and the current collector is ensured to be more compact; and then the finished dry electrode film and the current collector are firstly bonded by a hot roller to form an initial electrode, and then are subjected to cold roller shaping treatment to quickly synthesize the finished dry electrode.
The battery production line provided by the invention is described below, and the battery production line described below and the dry electrode preparation method described above can be referred to correspondingly to each other.
The battery production line provided by the invention comprises a dry electrode preparation device, and the dry electrode preparation device prepares a finished dry electrode by using the dry electrode preparation method described in any one of the embodiments, and the beneficial effects achieved by the battery production line are consistent with those of the dry electrode preparation method provided by the invention, so that the description is omitted here.
The above-described embodiment of the apparatus is merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method of preparing a dry electrode, comprising:
preforming, namely preforming the mixed raw materials to form a semi-finished product dry electrode film with self-supporting property;
carrying out delay press treatment, namely carrying out delay press treatment on the semi-finished product dry electrode film to enable the semi-finished product dry electrode film to form a finished product dry electrode film;
synthesizing a finished product dry electrode, and rolling and laminating the finished product dry electrode film and a current collector to form a finished product dry electrode;
the pre-forming treatment comprises two-stage extrusion treatment of the mixed raw materials by a pre-forming treatment device, and extrusion forming of the semi-finished product dry electrode film, wherein the volume of an extrusion inner cavity of the pre-forming treatment device is gradually reduced along the extrusion direction;
the method further comprises the step of judging whether a device for synthesizing the finished product dry electrode has faults or not:
if yes, the delay device for forming the finished dry electrode film conveys the finished dry electrode film to the temporary storage device so as to temporarily store the finished dry electrode film, and normal operation of the procedure of preparing the electrode film in advance is ensured;
if not, the delay pressing device for forming the finished dry electrode film conveys the finished dry electrode film into the device for synthesizing the finished dry electrode.
2. The method of claim 1, wherein the two-stage extrusion of the mixed raw materials and extrusion to form the semi-finished dry electrode film comprises:
and carrying out primary extrusion and vibration extrusion treatment on the mixed raw materials, and extruding to form the semi-finished dry electrode film.
3. The method for manufacturing a dry electrode according to claim 1, wherein the delay press treatment comprises:
carrying out hot rolling treatment on the semi-finished product dry electrode film;
and carrying out cold rolling treatment on the semi-finished product dry electrode film subjected to hot rolling to form the finished product dry electrode film.
4. The method of claim 1, wherein the synthetic finished dry electrode comprises:
hot rolling and laminating the finished dry electrode film and a current collector to form an initial electrode;
and cold rolling and shaping the initial electrode to form the finished dry electrode.
5. The method of claim 4, wherein the synthetic finished dry electrode further comprises: and before the initial electrode is formed, a small amount of adhesive is smeared on the joint surface of the finished dry electrode film and the joint surface of the current collector.
6. The method of claim 5, wherein the synthetic finished dry electrode further comprises: and before a small amount of adhesive is smeared on the bonding surface of the finished dry electrode film and the bonding surface of the current collector, roughening the bonding surface of the finished dry electrode film and the bonding surface of the current collector.
7. The method for manufacturing a dry electrode according to claim 3, wherein the delay press treatment further comprises: and cutting off the residual edge of the finished dry electrode film.
8. The method of manufacturing a dry electrode according to claim 1, wherein in the synthetic finished dry electrode, the finished dry electrode films located above and below a current collector are simultaneously bonded to the current collector;
or, after the finished dry electrode film positioned above is attached to the upper surface of the current collector, the finished dry electrode film positioned below is attached to the lower surface of the current collector;
or after the finished dry electrode film positioned below is attached to the lower surface of the current collector, the finished dry electrode film positioned above is attached to the upper surface of the current collector.
9. A battery production line comprising a dry electrode preparation device, wherein the dry electrode preparation device prepares a finished dry electrode by using the dry electrode preparation method according to any one of claims 1 to 8.
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| CN114725320B (en) * | 2022-04-15 | 2023-06-20 | 三一技术装备有限公司 | Preparation method of dry pole piece |
| CN114709363A (en) * | 2022-04-29 | 2022-07-05 | 三一技术装备有限公司 | Dry-process pole piece and preparation method thereof |
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