CN114023918B - 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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- CN114023918B CN114023918B CN202111130211.3A CN202111130211A CN114023918B CN 114023918 B CN114023918 B CN 114023918B CN 202111130211 A CN202111130211 A CN 202111130211A CN 114023918 B CN114023918 B CN 114023918B
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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 20
- 238000001125 extrusion Methods 0.000 claims abstract description 137
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 230000008093 supporting effect Effects 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
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- 239000007772 electrode material Substances 0.000 description 3
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- H—ELECTRICITY
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- 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
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- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a dry electrode film preparation device and a battery production line, comprising: the extrusion preforming mechanism comprises an extrusion cavity and a screw device arranged in the extrusion cavity, wherein a feed inlet is formed in the first end of the extrusion cavity, a discharge outlet is formed in the second end of the extrusion cavity, and the screw device is used for extruding raw materials from the first end of the extrusion cavity to the second end of the extrusion cavity; the pressure-extending device comprises at least one stage of pressure-extending roller group, each stage of pressure-extending roller group comprises at least one pair of pressure-extending rollers, a pressure-extending gap is arranged between each pair of pressure-extending rollers, and the pressure-extending roller group at the initial end corresponds to the discharge hole of the extrusion cavity. According to the dry electrode film preparation device and the battery production line, the raw materials are pre-extruded to form the strip-shaped semi-finished product with certain self-supporting property, and then the strip-shaped semi-finished product is subjected to the delay treatment, so that the problem that the electrode film breaks the strip 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, raw material dry powder is 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 raw material to pass through is formed between each pair of delay press rollers, the delay press rollers can delay the passed raw material to form a dry electrode film, and the raw material dry powder output by the conveying system sequentially passes through the delay press functions of the multistage delay press rollers.
However, since the raw dry powder is not self-supporting when being output by the conveying system, the problem that the dry electrode film is easy to break is caused.
Disclosure of Invention
The invention provides a dry electrode film preparation device and a battery production line, which effectively avoid the problem of broken strips of an electrode film by carrying out pre-extrusion molding on raw materials to form a strip-shaped semi-finished product with certain self-supporting property and then carrying out delay press treatment.
The invention provides a dry electrode film preparation device, which comprises:
the extrusion preforming mechanism comprises an extrusion cavity and a screw device arranged in the extrusion cavity, wherein a feed inlet is formed in the first end of the extrusion cavity, a discharge outlet is formed in the second end of the extrusion cavity, and the screw device is used for extruding raw materials from the first end of the extrusion cavity to the second end of the extrusion cavity;
the pressure-extending device comprises at least one stage of pressure-extending roller group, each stage of pressure-extending roller group comprises at least one pair of pressure-extending rollers, a pressure-extending gap is arranged between each pair of pressure-extending rollers, and the pressure-extending roller group at the initial end corresponds to the discharge hole of the extrusion cavity.
According to the dry electrode film preparation device provided by the invention, the vibration inner sleeve is arranged in the extrusion cavity, and the vibration inner sleeve can vibrate along the extrusion direction perpendicular to the extrusion cavity.
According to the dry electrode film preparation device provided by the invention, along the direction from the first end to the second end of the extrusion cavity, the inner cavity volume of the extrusion cavity is gradually reduced, and/or the diameter of the rotating shaft of the screw device is gradually increased, and/or the diameter of the blade of the screw device is gradually increased.
According to the dry electrode film preparation device provided by the invention, at least two spiral devices are arranged in the extrusion 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 dry electrode film formed by delay press.
According to the dry electrode film preparation device provided by the invention, a first auxiliary supporting device is arranged between the discharge hole of the extrusion cavity and the extension roller group positioned at the initial end, and the first auxiliary supporting device is used for supporting the dry electrode film extruded by the extrusion cavity.
According to the dry electrode film preparation device provided by the invention, a second auxiliary supporting device is arranged between two adjacent stages of the extending roller groups, and the second auxiliary supporting device is used for supporting the dry electrode film which is extended and pressed by the extending roller groups.
The dry electrode film preparation device provided by the invention further comprises a feeding mechanism, wherein a discharge hole of the feeding mechanism is communicated with a feed hole of the extrusion cavity.
The dry electrode film preparation device provided by the invention further comprises a feeding mechanism, wherein a stirring device for stirring materials is arranged in the feeding mechanism, and a discharge hole of the feeding mechanism is communicated with a feed hole of the feeding mechanism.
According to the dry electrode film preparation device provided by the invention, the discharge hole is oval, rectangular or long-strip with zigzag 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 the thickness of the dry electrode film;
and the control module is used for controlling the rotating speeds of the feeding mechanism, the spiral device and the delay roller.
1. The invention provides a dry electrode film preparation device, which comprises an extrusion preforming mechanism and a pressure-delaying device, wherein the extrusion preforming mechanism comprises an extrusion cavity and a spiral device arranged in the extrusion cavity, a feed inlet is arranged at a first end of the extrusion cavity, a discharge outlet is arranged at a second end of the extrusion cavity, and the spiral device is used for extruding raw materials from the first end to the second end of the extrusion cavity. The pressure-delaying device comprises at least two stages of pressure-delaying roller groups, and the dry electrode film extruded by the extrusion cavity sequentially passes through the pressure-delaying function of each stage of pressure-delaying roller groups. 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 dry electrode film passes through the extending press gap, the 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 discharge port of the extrusion cavity, so that the dry electrode film extruded by the extrusion cavity can be firstly delayed and pressed by the delay roller group at the initial end.
The mixed raw material dry powder enters the extrusion cavity from the feed inlet, and under the driving and extrusion actions of the screw device, the mixed raw material dry powder is extruded and is extruded from the discharge outlet to form a dry electrode film, and the semi-finished dry electrode film formed after extrusion has certain self-supporting property. And then, the dry electrode film is subjected to the delay action of each stage of delay roller groups, so that a 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 pre-extruded and formed, the strip-shaped semi-finished product with certain self-supporting property is formed, and then the strip-shaped semi-finished product is subjected to the delay treatment, so that the problem of strip breakage of the electrode film is effectively avoided.
2. In a further scheme of the invention, the extrusion cavity is internally provided with the vibration inner sleeve, and the vibration inner sleeve can vibrate along the extrusion direction perpendicular to the extrusion cavity. The vibration inner sleeve is nested in the extrusion cavity, the screw device is arranged in the vibration inner sleeve, raw material dry powder is conveyed and extruded by the screw device in the vibration inner sleeve, meanwhile, the vibration inner sleeve can generate vibration force perpendicular to the extrusion direction, the effect of repeatedly compacting the raw material dry powder is achieved, the extrusion effect of the raw material dry powder is further improved, the dry electrode film extruded by the extruder has better self-supporting performance, and the problem of breakage of the dry electrode film is further reduced.
3. In a further aspect of the invention, along the direction from the feed inlet to the discharge outlet of the extrusion chamber, the inner chamber volume of the extrusion chamber is gradually reduced, and/or the diameter of the spindle of the screw device is gradually increased, and/or the diameter of the blade of the screw device is gradually increased.
So set up, along the feed inlet to the discharge gate direction in extrusion chamber, the inner space in extrusion chamber reduces gradually, and then makes raw materials dry powder increase gradually along with screw means's the extrusion force that carries the whereabouts, forms better extrusion effect, has further improved the self-supporting nature of the dry electrode membrane that forms after extruding.
4. In a further aspect of the invention, at least two screw means are provided in the extrusion chamber. So set up, the raw materials dry powder in the extrusion chamber receives the simultaneous extrusion and the transport of two at least spiral devices, and extrusion efficiency and extrusion effect can obtain effectively promoting, have further improved the self-supporting nature of the 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 characterized in that the raw materials are pre-extruded to form a strip-shaped semi-finished product with a certain self-supporting property, and then the strip-shaped semi-finished product is subjected to the delay treatment, so that the problem of breakage of an 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 an extrusion preform mechanism in accordance with one embodiment of the present invention;
FIG. 3 is a schematic view of an extrusion preform mechanism provided with two screw devices in an embodiment of the present invention;
FIG. 4 is a schematic view showing a change in the rotation axis of the screw device according to the embodiment of the present invention;
FIG. 5 is a schematic view of a variation of the helical blade of the screw device in an embodiment of the present invention;
FIG. 6 is a schematic view of the shape of a discharge port of an extrusion chamber in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of another discharge port shape of an extrusion chamber in accordance with an embodiment of the present invention;
11: a stirring device; 12: a feeding mechanism; 13: a feeding mechanism;
14: a feed port of the extrusion chamber; 15: a screw device; 16: an extrusion chamber;
17: a vibrating inner sleeve; 18: a discharge port of the extrusion cavity; 19: a first auxiliary supporting device;
20: a pressure-spreading device; 21: a roller set; 22: a second auxiliary supporting device;
23: and the trimming 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, including the extrusion preforming mechanism and the delay press 20, is described below with reference to fig. 1 to 7.
The extrusion preforming mechanism comprises an extrusion cavity 16 and a screw device 15 arranged in the extrusion cavity 16, specifically, the screw device 15 can comprise a rotating shaft, a screw blade arranged on the rotating shaft, a motor for driving the rotating shaft, a hydraulic motor or a pneumatic motor and other driving devices, and two ends of the rotating shaft are arranged at two end positions of the extrusion cavity 16 through bearings.
The first end of the extrusion cavity 16 is provided with a feed inlet, the second end is provided with a discharge outlet, the spiral device 15 is used for extruding raw materials from the first end to the second end of the extrusion cavity 16, raw material dry powder enters from the feed inlet 14 of the extrusion cavity, the raw material dry powder is extruded from the discharge outlet after extrusion of the spiral device 15, and the extruded raw material dry powder forms a dry electrode film structure, wherein the cross section shape of the extruded dry electrode film is consistent with the shape of the discharge outlet, specifically, the shape of the discharge outlet 18 of the extrusion cavity can be set to be rectangular as shown in fig. 6, zigzag as shown in fig. 7, elliptical, special-shaped and other shapes, and can be specifically set according to practical situations.
The stretching device 20 comprises at least one stage of stretching roller group 21, and the embodiment is preferably provided with more than two stages of stretching roller groups 21, and the dry electrode film extruded by the extrusion cavity 16 sequentially passes through the stretching action of each stage of stretching roller groups 21. Each stage of the extension press roller group 21 comprises at least one pair of extension press rollers, and an extension press gap is arranged between each pair of extension press rollers, and when the dry electrode film passes through the extension press gap, the dry electrode film is subjected to the extension press action of the extension press rollers. The initial end of the delay roller group 21 corresponds to the discharge port 18 of the extrusion cavity, so that the dry electrode film extruded by the extrusion cavity 16 can be firstly delayed by the initial end of the delay roller group 21.
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 delay gaps of each stage of delay roller groups 21 can be reduced step by step, the thickness of the dry electrode film is gradually reduced along with the delay effect of each stage of delay roller groups 21, the density is gradually increased, and the delay quality is ensured.
In the process of preparing the dry electrode film, the mixed raw material dry powder enters the extrusion cavity 16 from the feed inlet, and is extruded from the discharge outlet to form the dry electrode film under the driving and extrusion actions of the screw device 15, and the dry electrode film formed after extrusion has certain self-supporting property. And then, the dry electrode film is subjected to the delay action of each stage of delay roller group 21, so that a finished dry electrode film can be formed.
By means of the arrangement, the dry electrode film preparation device provided by the embodiment forms the strip-shaped dry electrode film with certain self-supporting property by pre-extrusion molding of raw materials, and then carries out the delay treatment, so that the problem that the dry electrode film is broken is effectively avoided.
In a further embodiment, a vibrating inner sleeve 17 is arranged in the extrusion chamber 16, and the vibrating inner sleeve 17 is capable of vibrating along the extrusion chamber 16 perpendicular to the extrusion direction.
In some embodiments, the vibration inner sleeve 17 may also be provided as an integral cavity-like structure nested between the screw 15 and the inner wall of the extrusion chamber 16. The outside of the extrusion chamber 16 may be provided with a vibration generating device, and the specific structure of the vibration generating device may refer to a vibration generating device in a vibration screen in the related art, which is not described herein. The vibration generating device can be connected with the vibration inner sleeve 17 through an opening formed on the side wall of the extrusion cavity 16 or an opening at the end part, so that the vibration inner sleeve 17 can be driven to generate a vibration effect.
Of course, in other embodiments, the vibration inner sleeve 17 may be configured as a split structure, for example, may be configured as a half-cavity structure, and the half-cavity structure is a pair, where the pair of half-cavity structures can be butted to form an integral cavity structure, where one half-cavity structure may be fixedly configured, and the other half-cavity structure may be connected to the vibration sound generating device, or both half-cavity structures may be connected to the vibration sound generating device.
The vibration inner sleeve 17 is nested in the extrusion cavity 16, the spiral device 15 is arranged in the vibration inner sleeve 17, raw material dry powder is conveyed and extruded by the spiral device 15 in the vibration inner sleeve 17, meanwhile, the vibration inner sleeve 17 can generate vibration perpendicular to the extrusion direction, the raw material dry powder is repeatedly compacted, the extrusion effect of the raw material dry powder is further improved, the dry electrode film extruded by the extruder has better self-supporting performance, and the belt breakage problem of the dry electrode film is further reduced.
In a further embodiment, the interior of the extrusion chamber 16 may be configured as follows:
1. along the direction from the first end to the second end of the extrusion chamber 16, the inner cavity volume of the extrusion chamber 16 is gradually reduced, for example, the inner wall surface of the extrusion chamber 16 may be configured as a circular table surface, and the large diameter end of the circular table surface is close to the first end of the extrusion chamber 16, and the small diameter end is close to the second end of the extrusion chamber 16;
2. the diameter of the rotation shaft of the screw 15 gradually increases along the direction from the first end to the second end of the extrusion chamber 16, as shown in fig. 4, for example, the rotation shaft of the screw 15 is set as a conical shaft, and the large diameter end of the conical shaft is close to the second end of the extrusion chamber 16, and the small diameter end is close to the first end of the extrusion chamber 16;
3. the diameter of the blades of the screw 15 increases gradually in the direction from the first end to the second end of the extrusion chamber 16, 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 first end to the second end direction in extrusion chamber, the inner space in extrusion chamber 16 reduces gradually, and then makes raw materials dry powder increase gradually along with the extrusion force that screw means 15 carried the whereabouts, forms better extrusion effect, has further improved the self-supporting nature of the dry electrode membrane that forms after extruding.
In a further embodiment, at least two screws 15 are arranged in the extrusion chamber 16, for example, two screws 15 may be arranged in the extrusion chamber 16, and the rotation axes of the two screws 15 may be arranged in parallel side by side.
So set up, a plurality of spiral devices 15 in the extrusion chamber 16 can simultaneous workings, carry the extrusion to raw materials dry powder simultaneously, have effectively improved extrusion efficiency on the one hand, and the extrusion force of a plurality of spiral devices 15 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 23 are arranged on two sides of the output end of the delay press device 20, and the edge cutting devices 23 are used for cutting edges of the dry electrode films formed by delay press.
The trimming device 23 may be specifically a cutter disposed at two sides of the output end of the delay device 20, and the distance between the two cutters is the width of the dry electrode film after cutting. The interval of the edge cutting device 23 can be adjusted according to actual demands, and the dry electrode film output by the output end of the delay pressing device 20 can reach the width of the actual demands after being cut by the edge cutting device 23.
A first auxiliary supporting device 19 is arranged between the discharge hole 18 of the extrusion cavity and the extension roller group 21 positioned at the initial end, and the first auxiliary supporting device 19 is used for supporting the dry electrode film extruded by the extrusion cavity 16.
The first auxiliary supporting device 19 may be specifically a supporting platform, the table surface of the supporting platform is a plane, and the dry electrode film extruded by the extrusion cavity 16 is transited to the extension roller set 21 at the starting end under the supporting action of the plane. The "initial end of the calender roll set 21" means the calender roll set 21 located at the initial end in the direction in which the dry electrode film is sequentially calendered.
Similarly, a second auxiliary supporting device 22 may be disposed between the two adjacent two-stage stretching roller sets 21 and between the terminal stretching roller set 21 and the trimming device, and the second auxiliary supporting device 22 is used for supporting the dry electrode film stretched by the stretching roller set 21.
The second auxiliary support device 22 may be of the same construction as the first auxiliary support device 19. So set up, when the dry electrode membrane after extruding by extrusion chamber 16 gets into and prolong the pressure device 20, and after the pressure effect that delays compression roller group 21 at each level, can all receive auxiliary stay effect, avoid producing the problem of broken area because of the effect of self gravity.
The dry electrode film preparation device in the embodiment of the invention can further comprise a feeding mechanism 13, wherein a discharge hole of the feeding mechanism 13 is communicated with a feed hole 14 of the extrusion cavity. The feeding mechanism 13 may be of the screw conveyor or belt conveyor type, etc., and the feeding mechanism 14 is used to feed the raw dry powder into the extrusion chamber 16. In this embodiment, the feeding mechanism 13 is preferably a screw conveyor, and the feeding cavity of the screw conveyor and the extrusion cavity 16 may be integrally formed, and the screw shaft of the screw conveyor and the rotating shaft of the screw device in the extrusion cavity 16 are integrally formed.
In addition, the dry electrode film preparation device provided by the embodiment can further comprise a feeding mechanism 12, a stirring device 11 for stirring materials is arranged inside the feeding mechanism 12, and a discharge hole of the feeding mechanism 12 is communicated with a feed hole of the feeding mechanism 13.
The stirring device 11 may specifically include a rotation shaft, blades provided on the rotation shaft, and a motor driving the rotation shaft. The shaft may be mounted on the sidewall of the feed mechanism 12 by bearings, and the motor drives the shaft and blades to rotate to agitate the dry powder of the feedstock material in the feed mechanism 12.
So set up, the raw materials dry powder after the stirring has better mobility, and then in follow-up feeding mechanism 13 and extrusion chamber 16, the raw materials dry powder can be more even, guarantees that the dry electrode membrane of extrusion has better uniformity.
In some embodiments, the extrusion chamber outlet 18 may be shaped as a zigzag strip. So set up, the dry electrode film of extrusion is the thin sheet structure, and the surface has the line of cockscomb structure, and in the follow-up pressure process of delaying, even if two adjacent positions thin thickness differences of dry electrode film are great, the raw materials of cockscomb structure protruding part is enough filled in thinner position yet, has guaranteed the thin thickness uniformity of dry electrode film after delaying the pressure.
In a further embodiment, the dry electrode film manufacturing apparatus further comprises a dry electrode film detection module for detecting the density and thickness of the dry electrode film, and a control module, and in other embodiments, for detecting the width of the dry electrode film. The control module is used for controlling the rotation speed of the screw device 15 and the extension roller.
When the detected density and thickness of the dry electrode film exceed the preset range, the control device can control the rotation speed of the spiral device 15 and the delay rollers, 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 rollers, 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 23. Meanwhile, the control module in the embodiment can also be used for controlling the feeding speed of the feeding mechanism.
The embodiment of the invention also provides a battery production line comprising the dry electrode film preparation device, and the battery production line provided by the embodiment of the invention effectively avoids the problem of broken strips of the electrode film by carrying out pre-extrusion molding on raw materials to form a strip-shaped semi-finished product 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 (11)
1. A dry electrode film production apparatus, comprising:
the extrusion preforming mechanism comprises an extrusion cavity and a screw device arranged in the extrusion cavity, wherein a feed inlet is formed in the first end of the extrusion cavity, a discharge outlet is formed in the second end of the extrusion cavity, and the screw device is used for extruding raw materials from the first end of the extrusion cavity to the second end of the extrusion cavity;
the pressure-extending device comprises at least one stage of pressure-extending roller group, each stage of pressure-extending roller group comprises at least one pair of pressure-extending rollers, a pressure-extending gap is arranged between each pair of pressure-extending rollers, and the pressure-extending roller group at the initial end corresponds to the discharge hole of the extrusion cavity; wherein,,
along the direction from the first end to the second 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 device is gradually increased, and/or the diameter of a blade of the screw device is gradually increased, and/or at least two screw devices are arranged in the extrusion cavity.
2. The dry electrode film manufacturing apparatus according to claim 1, wherein a vibration liner is provided in the pressing chamber, and the vibration liner is capable of vibrating in a pressing direction perpendicular to the pressing chamber.
3. 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.
4. The dry electrode film preparation apparatus according to claim 1, wherein the edge cutting devices are provided on both sides of the output end of the edge rolling device, and the edge cutting devices are used for cutting edges of the dry electrode film formed by the edge rolling.
5. The dry electrode film preparation device according to claim 1, wherein a first auxiliary supporting device is arranged between the discharge port of the extrusion cavity and the extension roller group positioned at the starting end, and the first auxiliary supporting device is used for supporting the dry electrode film extruded by the extrusion cavity.
6. The dry electrode film preparing apparatus according to claim 5, wherein a second auxiliary supporting device is provided between the two adjacent stages of the stretching roller groups, and the second auxiliary supporting device is used for supporting the dry electrode film stretched by the stretching roller groups.
7. The dry electrode film producing apparatus according to claim 1, further comprising a feeding mechanism, a discharge port of the feeding mechanism being communicated with a feed port of the extrusion chamber.
8. The dry electrode film producing apparatus according to claim 7, further comprising a feeding mechanism, wherein a stirring device for stirring the material is provided inside the feeding mechanism, and a discharge port of the feeding mechanism is communicated with a feed port of the feeding mechanism.
9. The apparatus according to claim 1, wherein the discharge port has an oval, rectangular or zigzag-shaped strip shape.
10. The dry electrode film production apparatus according to claim 7, further comprising:
the dry electrode film detection module is used for detecting the density and the thickness of the dry electrode film;
and the control module is used for controlling the speeds of the feeding mechanism, the spiral device and the delay roller.
11. A battery production line comprising the dry electrode film production apparatus according to any one of claims 1 to 10.
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| CN114975887B (en) * | 2022-06-27 | 2024-05-10 | 蔚来汽车科技(安徽)有限公司 | Processing method for dry electrode film and processing apparatus for dry electrode film |
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