CN114039021B - Dry electrode film preparation device and battery production line - Google Patents
Dry electrode film preparation device and battery production line Download PDFInfo
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- CN114039021B CN114039021B CN202111130195.8A CN202111130195A CN114039021B CN 114039021 B CN114039021 B CN 114039021B CN 202111130195 A CN202111130195 A CN 202111130195A CN 114039021 B CN114039021 B CN 114039021B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a dry electrode film preparation device and a battery production line, comprising: the first-stage pretreatment device comprises a first compression device and a cutter device, wherein the output end of the first compression device corresponds to the input end of the cutter device, the first compression device is used for compressing the dry powder raw material so as to enable the dry powder raw material to form a compressed form, and the cutter device is used for cutting the dry powder raw material in the compressed form into a block form; the second-stage pretreatment device comprises a second compression device, wherein the second compression device is used for compression molding of dry powder raw materials in a block shape to form a semi-finished dry electrode film; the pressure-extending device comprises at least one stage of pressure-extending roller group, and each stage of pressure-extending roller group comprises at least one pair of pressure-extending rollers. According to the dry electrode film preparation device and the battery production line, the mixed dry powder raw materials are subjected to compression pretreatment for two times to form the semi-finished dry electrode film with certain self-supporting property, and then the semi-finished dry electrode film is subjected to pressure-delaying treatment, so that the problem of belt breakage of the electrode film is effectively avoided.
Description
Technical Field
The invention relates to the technical field of battery electrode preparation, in particular to a dry electrode film preparation device and a battery production line.
Background
The electrode film is one of the key conditions for determining the energy density of the battery, and in the prior art, the preparation process of the electrode film is mainly divided into a wet coating preparation process and a dry electrode film preparation process.
In the dry electrode film manufacturing process, firstly, electrode active materials, conductive agents and adhesives are mixed to obtain electrode powder without using any solvent; and then the electrode powder is manufactured to form a thin electrode material strip, and finally the formed electrode material strip is pressed onto a metal foil current collector to form a finished electrode.
In a dry electrode film manufacturing process in the prior art, dry powder raw materials are output to a multistage delay press roller set from a conveying system, each stage of delay press roller set comprises a pair of delay press rollers, a gap for the raw materials to pass through is formed between each pair of delay press rollers, the delay press rollers can delay the passed raw materials to form a dry electrode film, and the dry powder raw materials output by the conveying system sequentially pass through the delay press functions of the multistage delay press rollers.
However, since the dry powder raw material is not self-supporting when being output from the conveying system, the problem that the dry electrode film is easily broken is caused.
Disclosure of Invention
The invention provides a dry electrode film preparation device and a battery production line, which are used for forming a semi-finished product dry electrode film with certain self-supporting property by carrying out two-stage compression pretreatment on raw materials and then carrying out delay press treatment, so that the problem of belt breakage of the electrode film is effectively avoided.
A first aspect of the present invention provides a dry electrode film production apparatus comprising:
the first-stage pretreatment device comprises a first compression device and a cutter device, wherein the output end of the first compression device corresponds to the input end of the cutter device, the first compression device is used for compressing dry powder raw materials to enable the dry powder raw materials to form a compressed form, and the cutter device is used for cutting the dry powder raw materials in the compressed form into a block form;
the second-stage pretreatment device comprises a second compression device, wherein the second compression device is used for compression molding of the dry powder raw materials in a block shape to form a semi-finished dry electrode film;
the pressure-delaying device comprises at least one stage of pressure-delaying roller group, each stage of pressure-delaying roller group comprises at least one pair of pressure-delaying rollers, and the pressure-delaying rollers are used for carrying out pressure-delaying on the semi-finished dry electrode film so as to form the finished dry electrode film.
According to the dry electrode film preparation device provided by the invention, the primary pretreatment device further comprises:
and the output end of the mixing device corresponds to the input end of the first compression device, and the mixing device is used for secondarily mixing the dry powder raw materials.
According to the dry electrode film preparation device provided by the invention, the secondary pretreatment device further comprises:
and the input port of the conveying device is arranged below the output end of the cutter device, so that the dry powder raw materials in the block shape can fall into the input port of the conveying device, and the output port of the conveying device corresponds to the input port of the second compression device.
According to the dry electrode film manufacturing apparatus provided by the present invention, the first compression apparatus and the second compression apparatus each include:
the extrusion device is used for extruding raw materials from the input end to the output end of the extrusion cavity.
According to the dry electrode film preparation device provided by the invention, along the direction from the input end to the output end of the extrusion cavity, the inner cavity volume of the extrusion cavity is gradually reduced, and/or the diameter of a rotating shaft of the screw extrusion device is gradually increased, and/or the diameter of a blade of the screw extrusion device is gradually increased.
According to the dry electrode film preparation device provided by the invention, at least two spiral extrusion devices arranged side by side are arranged in the extrusion cavity.
According to the dry electrode film preparation device provided by the invention, the cutter device comprises:
the mounting frame is provided with a rotating shaft;
the blades are arranged in a plurality, and the blades are circumferentially arranged on the mounting frame by taking the rotating shaft as the center.
According to the dry electrode film preparation device provided by the invention, the mixing device comprises:
the mixing device comprises a mixing cavity and a spiral mixing device arranged in the mixing cavity, wherein the spiral mixing device can convey raw materials from an input end to an output end of the mixing cavity.
According to the dry electrode film preparation device provided by the invention, at least two spiral mixing devices arranged side by side are arranged in the mixing cavity.
According to the dry electrode film preparation device provided by the invention, the delay roller is provided with a heating device for heating the roller surface, and the heating device is provided with a temperature regulating module.
According to the dry electrode film preparation device provided by the invention, the two sides of the output end of the delay press device are provided with the edge cutting devices, and the edge cutting devices are used for cutting edges of the finished dry electrode film.
According to the dry electrode film preparation device provided by the invention, a first auxiliary supporting device is arranged between the output end of the second compressing device and the extension roller group positioned at the initial end, and the first auxiliary supporting device is used for supporting the semi-finished dry electrode film output by the second compressing device; and/or the number of the groups of groups,
and a second auxiliary supporting device is arranged between the two adjacent extending roller groups and used for supporting the dry electrode film which is extended and pressed by the extending roller groups.
According to the dry electrode film preparation device provided by the invention, the discharge hole of the second compression device is oval, rectangular or long-strip with sawtooth-shaped edges.
The dry electrode film preparation device provided by the invention further comprises:
the dry electrode film detection module is used for detecting the density and thickness of the semi-finished dry electrode film and the finished dry electrode film;
and the control module is used for controlling the speeds of the conveying device, the first compression device, the second compression device and the delay roller.
A second aspect of the present invention provides a battery production line comprising the dry electrode film production apparatus as described in any one of the above.
1. The dry electrode film preparation device provided by the invention comprises a first-stage pretreatment device, a second-stage pretreatment device and a delay device, wherein the first-stage pretreatment device comprises a first compression device and a cutter device; the secondary pretreatment device comprises a second compression device; the pressure-extending device comprises at least one stage of pressure-extending roller group.
The mixed dry powder raw materials firstly enter a first compression device of a first-stage pretreatment device for compression treatment to form dry powder raw materials in a compressed state, and then the dry powder raw materials in the compressed state are cut into block-shaped forms through a cutter device, so that the crushed block-shaped dry powder raw materials are formed.
The block-shaped dry powder raw material formed after the primary pretreatment can enable the raw material to have a certain solidification shape, is convenient for subsequent conveying and secondary compression treatment, and improves the compression effect of the secondary compression treatment. The dry powder raw material in the block shape enters the second compression device for compression and is discharged from a discharge hole of the second compression device, a semi-finished dry electrode film can be formed after compression treatment of the second compression device, and the semi-finished dry electrode film formed after secondary pretreatment has good self-supporting property. And then, the semi-finished dry electrode film is subjected to the delay pressing action of each stage of delay pressing roller group, so that the finished dry electrode film can be formed.
By means of the arrangement, the dry electrode film preparation device provided by the invention has the advantages that the raw materials are preprocessed twice to form the semi-finished product dry electrode film with certain self-supporting property, and then the voltage-delay processing is carried out, so that the problem of belt breakage of the electrode film is effectively avoided.
2. In a further scheme of the invention, the primary pretreatment device further comprises a mixing device, the output end of the mixing device corresponds to the input end of the first compression device, and the mixing device is used for secondarily mixing the dry powder raw materials. The dry powder raw materials are mixed dry powder raw materials, the mixing device is used for secondary mixing of the dry powder raw materials, and the dry powder raw materials are stirred through the mixing device, so that various components in the dry powder raw materials can be fully mixed and homogenized, further raw materials with uniform quality are formed, and the finished dry electrode film is guaranteed to have good quality consistency.
3. In a further technical scheme of the invention, the device further comprises a conveying device, the input port of the conveying device is arranged at the upper position of the conveying device, and the input port of the conveying device is positioned below the output end of the cutter device, so that the block-shaped dry powder raw materials formed after the cutter device is processed can fall into the input port of the conveying device, and the output port of the conveying device corresponds to the input port of the second compression device.
The dry powder raw materials in the block-shaped form formed by cutting through the cutter device can fall into the input port of the conveying device freely, and are conveyed to the second compression device for secondary compression through the conveying device, so that the production efficiency is effectively improved.
4. In a further aspect of the present invention, the first compression device and the second compression device both include: the extrusion device is used for extruding raw materials from the input end to the output end of the extrusion cavity.
Screw extrusion device is provided with helical blade in the pivot promptly, can drive helical blade and carry out helical rotation when the pivot rotates, can form the compression effect to the raw materials in extrusion chamber on the one hand, on the other hand can play the effect that the raw materials was carried simultaneously.
5. In a further aspect of the invention, the inner cavity volume of the extrusion chamber is gradually reduced along the direction from the input end to the output end of the extrusion chamber, and/or the diameter of the rotating shaft of the screw extrusion device is gradually increased, and/or the diameter of the blades of the screw extrusion device is gradually increased.
So set up, along the input to the output direction in extrusion chamber, the inner space in extrusion chamber reduces gradually, and then makes the extrusion force that dry powder raw materials received along with screw extrusion device's transport increase gradually, forms better extrusion effect, has further improved the self-supporting nature of the semi-manufactured goods dry electrode membrane that forms after extruding.
The invention also provides a battery production line comprising the dry electrode film preparation device, and the battery production line provided by the invention is arranged in such a way that the semi-finished product dry electrode film with certain self-supporting property is formed by carrying out two-stage compression pretreatment on raw materials and then carrying out delay press treatment, so that the problem of broken strips of the electrode film is effectively avoided. The development process of the beneficial effects is substantially similar to that brought by the dry electrode film preparation device, and will not be described herein.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an apparatus for preparing a dry electrode film in an embodiment of the present invention;
FIG. 2 is a schematic view of a mixing device provided with two spiral mixing devices in an embodiment of the invention;
FIG. 3 is a schematic view of a compression device provided with two screw extrusion devices in an embodiment of the present invention;
FIG. 4 is a schematic view showing a change in a rotation axis of the screw press according to the embodiment of the present invention;
FIG. 5 is a schematic view showing a variation of a screw blade of the screw press according to the embodiment of the present invention;
FIG. 6 is a schematic view of the shape of the discharge port of the compression chamber of the second compression device in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of another shape of the extrusion chamber discharge port of the second compression device in accordance with an embodiment of the present invention;
11: a first-stage pretreatment device; 12: a secondary pretreatment device; 13: a pressure-spreading device;
14: a first compression device; 15: a mixing device; 16: a cutter device;
17: a second compression device; 18: a conveying device; 19: a first auxiliary supporting device;
20: a second auxiliary supporting device; 21: a trimming device; 22: a spiral mixing device;
23: a screw extrusion device; 24: and a discharge hole of the extrusion cavity of the second compression device.
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 film manufacturing apparatus in the embodiment of the present invention, which includes a primary pretreatment apparatus 11, a secondary pretreatment apparatus 12, and a delay press apparatus 13, is described below with reference to fig. 1 to 7.
The primary pretreatment device 11 includes a first compression device 14 and a cutter device 16, an output end of the first compression device 14 corresponds to an input end of the cutter device 16, the first compression device 14 is used for compressing the dry powder raw material to form a compressed form of the dry powder raw material, and the cutter device 16 is used for cutting the dry powder raw material in the compressed form into a block form.
The secondary pretreatment device 12 comprises a second compression device 17, and the second compression device 17 is used for compression molding of dry powder raw materials in a block shape to form a semi-finished dry electrode film.
The pressure-delaying device 13 comprises at least one stage of pressure-delaying roller group, each stage of pressure-delaying roller group comprises at least one pair of pressure-delaying rollers, and the pressure-delaying rollers are used for delaying the semi-finished dry electrode film so as to form the finished dry electrode film.
In some embodiments, the first compression device 14 and the second compression device 17 each comprise a compression chamber and a screw extrusion device 23 disposed within the compression chamber, the screw extrusion device 23 being configured to extrude a feedstock from an input end to an output end of the compression chamber. Specifically, the screw extrusion device 23 may include a rotating shaft, a screw blade disposed on the rotating shaft, and a motor, a hydraulic motor, or a pneumatic motor for driving the rotating shaft, and the like, both ends of the rotating shaft being mounted at both end positions of the extrusion chamber through bearings.
The input end of the extrusion cavity is provided with a feed inlet, the output end is provided with a discharge outlet, the screw extrusion device 23 is used for extruding raw materials from the input end of the extrusion cavity to the output end, dry powder raw materials enter from the feed inlet of the extrusion cavity of the first compression device 14, are extruded from the discharge outlet after being compressed by the screw extrusion device 23 of the first compression device 14, and the extruded dry powder raw materials form a compressed form. The cutter device 16 is used to cut the dry powder material in compressed form into a block-like form. The dry powder raw material in the form of a block enters a second compression device 17, and is extruded by the second compression device 17 to form a semi-finished dry electrode film.
The semi-finished product dry electrode film formed after the secondary pretreatment has better self-supporting property. And then, the semi-finished dry electrode film is subjected to the delay pressing action of each stage of delay pressing roller group, so that the finished dry electrode film can be formed.
By means of the arrangement, the dry electrode film preparation device provided by the embodiment performs pretreatment on the raw materials twice, and performs delay press treatment after forming the semi-finished product dry electrode film with certain self-supporting property, so that the problem of belt breakage of the electrode film is effectively avoided.
The cross-sectional shape of the semi-finished dry electrode film extruded by the screw extrusion device 23 of the second compression device 17 is identical to the shape of the extrusion cavity discharge port 24 of the second compression device, specifically, the extrusion cavity discharge port 24 of the second compression device may be configured to have a rectangular shape as shown in fig. 6, a zigzag shape as shown in fig. 7, an elliptical shape, a special shape, or the like, and may be specifically configured according to practical situations.
The pressure-spreading device 13 comprises at least one stage of pressure-spreading roller group, and the embodiment is preferably provided with more than two stages of pressure-spreading roller groups, and the semi-finished dry electrode film extruded by the extrusion cavity of the second compression device 17 sequentially passes through the pressure-spreading function of each stage of pressure-spreading roller group. Each stage of the extending press roller group comprises at least one pair of extending press rollers, and an extending press gap is arranged between each pair of extending press rollers, and when the semi-finished product dry electrode film passes through the extending press gap, the semi-finished product dry electrode film is subjected to the extending press action of the extending press rollers. The delay roller group at the initial end corresponds to the extrusion cavity discharge port 24 of the second compression device, so that the semi-finished dry electrode film extruded by the extrusion cavity can be firstly delayed by the delay roller group at the initial end.
The thickness and the density of the dry electrode film are affected by the thickness and the gap between the two pairs of the pressing rollers, so that the gap between the pressing rollers can be adjusted according to the density and the thickness of the dry electrode film in actual production.
In addition, along the conveying direction of the dry electrode film, the pressure-delaying gaps of each stage of pressure-delaying roller groups can be gradually reduced, the thickness of the dry electrode film is gradually reduced along with the pressure-delaying effect of each stage of pressure-delaying roller groups, the density is gradually increased, and the pressure-delaying quality is ensured.
In a further embodiment of the present invention, the primary pretreatment device 11 further comprises a mixing device 15, an output end of the mixing device 15 corresponds to an input end of the first compression device 14, and the mixing device 15 is used for secondary mixing of dry powder raw materials.
Specifically, the mixing device 15 comprises a mixing chamber and a screw mixing device 22 arranged in the mixing chamber, the screw mixing device 22 being capable of transporting raw materials from an input end to an output end of the mixing chamber.
The screw mixing device 22 includes a rotating shaft and a screw blade provided on the rotating shaft, and the rotating shaft is installed in the mixing chamber through a bearing. Also, the shaft may be driven by an electric motor, an internal combustion engine, a hydraulic motor, a pneumatic motor, or the like.
So set up, mixing arrangement 15 can carry out intensive mixing to the dry powder raw materials, guarantees that the various components of dry powder raw materials misce bene, and then makes the finished product dry electrode membrane that forms have better uniformity. On the other hand, the mixing device 15 thus provided also has a conveying function, and can perform the function of conveying the dry powder raw material into the first compression device 14 while mixing the dry powder raw material, thereby improving the production efficiency.
Moreover, the dry powder raw material stirred by the mixing device 15 has better fluidity, so that the dry powder raw material can be more uniform in the subsequent first compression device 14, and the dry electrode film is ensured to have better consistency.
In order to further increase the mixing efficiency and mixing effect of the dry powder raw materials, at least two spiral mixing devices 22 are arranged side by side in the mixing chamber, as shown in fig. 2. So configured, the mixing effect and mixing efficiency are further improved by simultaneously delivering dry powder material and agitated dry powder material by at least two helical mixing devices 22.
In a further embodiment, the secondary pretreatment device 12 further comprises a conveying device 18, wherein an input port of the conveying device 18 is arranged below an output end of the cutter device 16, so that dry powder raw materials in a block shape can fall into the input port of the conveying device 18, and an output port of the conveying device 18 corresponds to an input port of the second compression device 17.
In this embodiment, the conveying device 18 may specifically include a conveying chamber and a screw conveying device 18 disposed in the conveying chamber, and the screw conveying device 18 may include a rotating shaft and a screw blade disposed on the rotating shaft.
The dry powder raw materials in the block shape formed by cutting of the cutter device 16 can fall into the input port of the conveying device 18 freely, and are conveyed to the second compression device 17 for secondary compression by the conveying device 18, so that the production efficiency is effectively improved.
In a further embodiment, the cutter device 16 comprises a mounting frame and blades, wherein the mounting frame is provided with a rotating shaft, the blades are provided in plurality, and the blades are circumferentially arranged on the mounting frame centering around the rotating shaft.
The pivot of mounting bracket can be driven by drive arrangement such as motor and rotate, and when the mounting bracket rotated, the blade rotated along with the mounting bracket, and then can carry out the rotary-cut to the dry powder raw materials of compression state, makes it form the fragment state.
In a further embodiment, the interior of the compression chambers of the first 14 and second 17 compression devices may be provided as follows:
1. along the direction from the input end to the output end of the extrusion cavity, the inner cavity volume of the extrusion cavity is gradually reduced, for example, the inner wall surface of the extrusion cavity can be a round table surface, the large-diameter end of the round table surface is close to the input end of the extrusion cavity, and the small-diameter end is close to the output end of the extrusion cavity;
2. the diameter of the rotating shaft of the screw extrusion device 23 gradually increases along the direction from the input end to the output end of the extrusion cavity, as shown in fig. 4, for example, the rotating shaft of the screw extrusion device 23 is set as a conical shaft, and the large diameter end of the conical shaft is close to the output end of the extrusion cavity, and the small diameter end is close to the input end of the extrusion cavity;
3. the diameter of the blades of the screw press 23 increases gradually in the direction from the input end to the output end of the press chamber, as shown in fig. 5.
So set up, through the combination of one or more of above-mentioned three kinds of setting methods, can make along the input to the output direction in extrusion chamber, the inner space in extrusion chamber reduces gradually, and then makes the dry powder raw materials increase gradually along with the extrusion force that screw extrusion device 23 carried and receives, forms better extrusion effect.
In a further embodiment, at least two screw presses 23 are provided in the pressing chambers of the first and second compressing devices 14, 17, for example, two screw presses 23 may be provided in the pressing chamber, and the rotation axes of the two screw presses 23 may be arranged in parallel side by side, as shown in fig. 3.
So set up, a plurality of screw extrusion device 23 in the extrusion chamber can simultaneous working, carries the extrusion to the dry powder raw materials simultaneously, has effectively improved extrusion efficiency on the one hand, and the extrusion force of a plurality of screw extrusion device 23 is bigger on the other hand, can effectively improve extrusion effect.
In a further embodiment, the spreader roll is provided with a heating device for heating the roll surface, the heating device being provided with a temperature regulation module.
In some embodiments, the heating device may be an electric heating device disposed inside the extension roller, and the roller surface of the extension roller has thermal conductivity, the roller surface is heated by the electric heating device, and the temperature adjusting module may adjust the heating temperature by adjusting the current of the electric heating device. Of course, in other embodiments, the heating means may be provided in other types, such as an air flow heating means, which provides for heating the roll surface by blowing a generated flow of hot air against the roll surface.
Of course, in other embodiments, the heating device may also directly heat the dry electrode film, for example, the heating device may be an air flow heating device capable of blowing hot air onto the surface of the dry electrode film.
The setting like this, the pressure roller is carrying out the time delay to dry electrode film, can heat dry electrode film simultaneously, makes dry electrode film have better toughness and intensity.
In a further embodiment, edge cutting devices 21 are arranged on two sides of the output end of the delay press device 13, and the edge cutting devices 21 are used for cutting edges of the dry electrode films formed by delay press.
The trimming device 21 may be specifically a cutter disposed at two sides of the output end of the delay device 13, and the distance between the two cutters is the width of the dry electrode film after cutting. The interval of the edge cutting device 21 can be adjusted according to actual demands, and the dry electrode film output by the output end of the delay pressing device 13 can reach the width of the actual demands after being cut by the edge cutting device 21.
A first auxiliary supporting device 19 is arranged between the extrusion cavity discharge port 24 of the second compression device and the extension roller set positioned at the initial end, and the first auxiliary supporting device 19 is used for supporting the semi-finished dry electrode film extruded by the extrusion cavity of the second compression device 17.
The first auxiliary supporting device 19 may be specifically a supporting platform, the table surface of the supporting platform is a plane, and the semi-finished dry electrode film extruded by the extrusion cavity is transited to the extension roller set at the starting end under the supporting action of the plane. The "initial end of the roll set" means a roll set located at the initial end in the direction in which the dry electrode film is sequentially rolled.
Similarly, a second auxiliary supporting device 20 may be disposed between two adjacent two-stage stretching roller sets and between the terminal stretching roller set and the edge cutting device 21, where the second auxiliary supporting device 20 is used for supporting the dry electrode film stretched by the stretching roller set.
The second auxiliary support device 20 may be of the same construction as the first auxiliary support device 19. So set up, when the semi-manufactured goods dry electrode membrane after extruding by the extrusion chamber of second compression device 17 gets into multistage pressure device 13 that extends, and after the pressure effect that extends compression roller group at each stage, can all receive auxiliary stay effect, avoid producing the problem of broken area because of self gravity's effect.
In some embodiments, the extrusion chamber discharge port 24 of the second compression device may be shaped as a zigzag-shaped elongated strip. The semi-finished product dry electrode film is arranged in such a way, the extruded semi-finished product dry electrode film is of a sheet structure, the surface of the extruded semi-finished product dry electrode film is provided with serrated lines, and in the subsequent delay pressing process, even if the thickness difference between two adjacent positions of the semi-finished product dry electrode film is large, the raw materials of the serrated protruding parts are filled in the thinner positions, so that the consistency of the thickness of the dry electrode film after delay pressing is ensured.
In a further embodiment, the dry electrode film preparation device further comprises a dry electrode film detection module and a control module, wherein the dry electrode film detection module is used for detecting the density and the thickness of the semi-finished dry electrode film and the finished dry electrode film; the control module is used to control the speeds of the conveying means 18, the first compression means 14, the second compression means 17 and the spreader rolls.
When the detected density and thickness of the dry electrode film exceed the preset range, the control device can control the speeds of the conveying device 18, the first compression device 14, the second compression device 17 and the delay rolls, so that the density and thickness of the dry electrode film can be adjusted, or can be combined with adjusting the delay gap between the delay rolls, so that the density and thickness of the dry electrode film can be adjusted.
When the detected width of the dry electrode film exceeds the preset range, the cutting width of the dry electrode film may be adjusted by adjusting the pitch of the trimming device 21.
The embodiment of the invention also provides a battery production line comprising the dry electrode film preparation device, and by adopting the arrangement, the production line provided by the embodiment of the invention effectively avoids the problem of broken strips of the electrode film by carrying out precompression molding on raw materials twice to form a semi-finished product dry electrode film with certain self-supporting property and then carrying out delay press treatment. The development process of the beneficial effects is substantially similar to that brought by the dry electrode film preparation device, and will not be described herein.
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 (14)
1. A dry electrode film production apparatus, comprising:
the first-stage pretreatment device comprises a first compression device, a cutter device and a mixing device, wherein the output end of the first compression device corresponds to the input end of the cutter device, the first compression device is used for compressing dry powder raw materials to enable the dry powder raw materials to form a compressed form, the cutter device is used for cutting the dry powder raw materials in the compressed form into a block form, the output end of the mixing device corresponds to the input end of the first compression device, and the mixing device is used for secondarily mixing the dry powder raw materials;
the second-stage pretreatment device comprises a second compression device, wherein the second compression device is used for compression molding of the dry powder raw materials in a block shape to form a semi-finished dry electrode film;
the pressure-delaying device comprises at least one stage of pressure-delaying roller group, each stage of pressure-delaying roller group comprises at least one pair of pressure-delaying rollers, and the pressure-delaying rollers are used for carrying out pressure-delaying on the semi-finished dry electrode film so as to form the finished dry electrode film.
2. The dry electrode film production apparatus according to claim 1, wherein the secondary pretreatment apparatus further comprises:
and the input port of the conveying device is arranged below the output end of the cutter device, so that the dry powder raw materials in the block shape can fall into the input port of the conveying device, and the output port of the conveying device corresponds to the input port of the second compression device.
3. The dry electrode film production apparatus according to claim 1, wherein the first compression means and the second compression means each comprise:
the extrusion device is used for extruding raw materials from the input end to the output end of the extrusion cavity.
4. A dry electrode film producing apparatus according to claim 3, wherein the inner cavity volume of the extrusion chamber is gradually reduced and/or the diameter of the rotation shaft of the screw extrusion apparatus is gradually increased and/or the diameter of the blade of the screw extrusion apparatus is gradually increased in the direction from the input end to the output end of the extrusion chamber.
5. A dry electrode film producing apparatus according to claim 3, wherein at least two of said screw extruders are disposed side by side in said extrusion chamber.
6. The dry electrode film manufacturing apparatus according to claim 1, wherein the cutter device comprises:
the mounting frame is provided with a rotating shaft;
the blades are arranged in a plurality, and the blades are circumferentially arranged on the mounting frame by taking the rotating shaft as the center.
7. The dry electrode film production apparatus according to claim 1, wherein the mixing apparatus comprises:
the mixing device comprises a mixing cavity and a spiral mixing device arranged in the mixing cavity, wherein the spiral mixing device can convey raw materials from an input end to an output end of the mixing cavity.
8. The dry electrode film manufacturing apparatus according to claim 7, wherein at least two of the spiral mixing devices are disposed side by side in the mixing chamber.
9. The dry electrode film producing apparatus according to claim 1, wherein the casting roll is provided with a heating device for heating a roll surface, the heating device being provided with a temperature adjusting module.
10. The dry electrode film preparation device according to claim 1, wherein edge cutting devices are arranged on two sides of the output end of the delay pressing device, and the edge cutting devices are used for cutting edges of the finished dry electrode film.
11. The dry electrode film manufacturing apparatus according to claim 1, wherein a first auxiliary supporting device is provided between the output end of the second compressing device and the set of the stretching rollers at the start end, and the first auxiliary supporting device is used for supporting the semi-finished dry electrode film output by the second compressing device; and/or the number of the groups of groups,
and a second auxiliary supporting device is arranged between the two adjacent extending roller groups and used for supporting the dry electrode film which is extended and pressed by the extending roller groups.
12. The apparatus according to claim 1, wherein the discharge port of the second compressing apparatus has an oval shape, a rectangular shape or a long shape with a zigzag edge.
13. The dry electrode film production apparatus according to claim 2, further comprising:
the dry electrode film detection module is used for detecting the density and thickness of the semi-finished dry electrode film and the finished dry electrode film;
and the control module is used for controlling the speeds of the conveying device, the first compression device, the second compression device and the delay roller.
14. A battery production line comprising the dry electrode film production apparatus according to any one of claims 1 to 13.
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| CN202111130195.8A CN114039021B (en) | 2021-09-26 | 2021-09-26 | Dry electrode film preparation device and battery production line |
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| US20050266298A1 (en) * | 2003-07-09 | 2005-12-01 | Maxwell Technologies, Inc. | Dry particle based electro-chemical device and methods of making same |
| CN213212186U (en) * | 2020-10-10 | 2021-05-14 | 赣州市创翔电源有限公司 | Automatic paste coating machine for power battery pack |
| CN213936237U (en) * | 2020-11-03 | 2021-08-10 | 深圳市科晶智达科技有限公司 | Dry preparation equipment for lithium battery electrode |
| CN112687833B (en) * | 2020-12-24 | 2022-06-14 | 蜂巢能源科技有限公司 | Dry method electrode plate preparation method, electrode plate prepared by dry method electrode plate preparation method and application |
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