CN116825948A - Dry electrode manufacturing method and dry electrode manufacturing apparatus - Google Patents
Dry electrode manufacturing method and dry electrode manufacturing apparatus Download PDFInfo
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- CN116825948A CN116825948A CN202310837011.4A CN202310837011A CN116825948A CN 116825948 A CN116825948 A CN 116825948A CN 202310837011 A CN202310837011 A CN 202310837011A CN 116825948 A CN116825948 A CN 116825948A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 93
- 239000000843 powder Substances 0.000 claims abstract description 89
- 238000013329 compounding Methods 0.000 claims abstract description 26
- 238000003490 calendering Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims description 36
- 238000007599 discharging Methods 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 17
- 238000007493 shaping process Methods 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 7
- 238000009966 trimming Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 22
- 238000005299 abrasion Methods 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 6
- 208000035874 Excoriation Diseases 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 239000008188 pellet Substances 0.000 description 4
- 238000003475 lamination Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
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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
- H01M4/0433—Molding
-
- 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
-
- 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
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The application provides a dry electrode manufacturing method and dry electrode manufacturing equipment, wherein the dry electrode manufacturing method comprises the following steps: processing the fibrillated powder into a dough; processing the powder mass into a plurality of strips; calendaring and thinning the plurality of strips to form a film; and compounding the material film and the current collector into an electrode plate. According to the dry electrode manufacturing method, before the fibrous powder is rolled and thinned to form the material film, the fibrous powder is processed into the powder dough, so that part or all of the raw materials can be combined to form a bulk structure, and the powder dough is processed into a plurality of material strips, so that the pressure of the material strips on a device used for performing a film forming process can be reduced, the abrasion on the device is reduced, and the film forming quality is improved. In addition, the stability and strength of the film formed by calendaring and thinning the strip are higher.
Description
Technical Field
The present application relates to the field of battery manufacturing technology, and more particularly, to a dry electrode manufacturing method and a dry electrode manufacturing apparatus for performing the same.
Background
In the prior art, the electrode film required by preparing the dry electrode is required to be sieved in advance, the sieved powder enters a heated film forming roller assembly to be rolled into a film, then enters a thinning roller to be thinned through a roller assembly, and finally is wound. However, since the powder is solid powder, the pressure to which the powder is directly rolled by the plurality of rollers is great, the roller surfaces of the rollers are easily worn and deformed by the solid powder and are scratched, the film forming quality is affected, and the maintenance cost is high.
Disclosure of Invention
The application provides a new technical scheme of a dry electrode manufacturing method, which at least can solve the problem that the roller surface of a roller in a film forming roller assembly in the prior art is easy to wear.
The application also provides dry electrode manufacturing equipment for executing the dry electrode manufacturing method.
According to a first aspect of the present application, there is provided a dry electrode manufacturing method comprising the steps of:
processing the fibrillated powder into a dough;
processing the powder mass into a plurality of strips;
calendaring and thinning the plurality of strips to form a film;
and compounding the material film and the current collector into an electrode plate.
Optionally, processing the powder mass into the plurality of strips specifically includes the steps of:
throwing a powder mass into a containing cavity of a bin, wherein the bin is provided with a plurality of discharging holes communicated with the containing cavity;
extruding the powder mass to enable the powder mass to flow out of the accommodating cavity through the plurality of discharging holes so as to form a plurality of strips corresponding to the plurality of discharging holes one by one.
Optionally, the plurality of processed strips are arranged at intervals along a preset direction, and the steps of calendaring and thinning the plurality of strips to form the material film specifically include the following steps:
and respectively extruding the plurality of strips from two sides of the arrangement direction of the plurality of strips to form the material film.
Optionally, the step of compounding the material film and the current collector into the electrode sheet specifically includes the steps of:
releasing the current collector and allowing the current collector to pass between the two material films;
and respectively extruding the two material films from two sides of the current collector so that the two material films are respectively attached to two sides of the current collector to form electrode plates.
Optionally, after the material film and the current collector are compounded into the electrode plate, the method further comprises the following steps:
trimming the electrode plate formed by compounding;
and rolling the trimmed electrode plate.
According to a second aspect of the present application, there is provided a dry electrode manufacturing apparatus for performing the dry electrode manufacturing method according to any one of the above embodiments, the dry electrode manufacturing apparatus comprising: a powder dough processing device for processing the fibrillated powder into the powder dough; the material strip processing device is used for receiving the powder material clusters and processing the powder material clusters into a plurality of material strips, and is provided with a discharge end from which the material strips flow out; the film forming device is arranged opposite to the discharging end and is used for receiving and extruding the plurality of strips to form a material film; and the compounding device is arranged at the downstream of the film forming device and is used for receiving and compounding the material film and the current collector to form the electrode plate.
Optionally, the strip processing device includes: the storage bin is internally provided with a containing cavity for containing the powder clusters, the storage bin is provided with a discharge end, the discharge end is provided with a plurality of discharge holes, and the discharge holes are mutually spaced and are respectively communicated with the containing cavity; the extrusion assembly is arranged in the accommodating cavity and opposite to the discharge end, and is used for extruding the powder mass to the discharge end so as to drive the powder mass to pass through the discharge hole to form a plurality of strips.
Optionally, the apertures of the plurality of discharge holes are the same or different.
Optionally, the bin comprises: the main body is internally provided with the accommodating cavity and is provided with a feed inlet and a discharge outlet, the feed inlet and the discharge outlet are communicated with the accommodating cavity, and the feed inlet is used for inputting the powder clusters; the end cover is detachably arranged on the discharge hole in a covering mode, and the plurality of discharge holes penetrate through the end cover along the thickness direction of the end cover.
Optionally, the extrusion assembly comprises: the pressing plate is movably arranged in the accommodating cavity to be close to or far away from the discharging end, and is matched with the discharging end to define an extrusion space for accommodating the powder clusters; the screw rod is connected with one side surface of the pressing plate, which is far away from the discharge end, and one end of the screw rod, which is far away from the discharge end, is positioned outside the accommodating cavity; the driving piece is connected with one end, far away from the discharge end, of the screw rod, so that the pressing plate is driven to be close to or far away from the discharge end.
Optionally, at least one of the plurality of discharge holes is a circular hole.
Optionally, at least a part of the plurality of discharging holes are arranged at intervals along a preset direction, the film forming device comprises two film forming rollers, the axes of the two film forming rollers respectively extend along the preset direction, and the two film forming rollers are spaced to receive and squeeze the plurality of strips.
Optionally, the film forming apparatus is two, and the dry electrode manufacturing apparatus further includes:
the current collector unreeling device is arranged between the two film forming devices and used for releasing the current collector and enabling the current collector to pass through between the two material films formed by the two film forming devices, and the compound device is positioned at the downstream of the current collector unreeling device.
Optionally, the dry electrode manufacturing apparatus further comprises: the shaping device is arranged at the downstream of the composite device and is positioned at one side of the electrode sheet and used for shaping the electrode sheet output by the composite device; and the winding device is arranged at the downstream of the shaping device and is used for winding the shaped electrode plate.
According to the dry electrode manufacturing method of the present application, before the fibrillated powder is rolled and thinned to form a material film, the fibrillated powder is processed into a powder mass so that a part or all of the raw materials can be combined to form a mass structure, thereby reducing the pressure acting on the apparatus for performing the film forming process and reducing the abrasion to the apparatus. In addition, the powder mass is processed into a plurality of strips, so that the pressure applied to the device during calendaring and thinning can be further reduced, the abrasion of the device is further reduced, and the film forming quality is improved. In addition, the stability and strength of the film formed by calendaring and thinning the strip are also higher.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flow chart of a dry electrode manufacturing method according to one embodiment provided by the present application;
fig. 2 is a left side view of one state of a strip processing device of a dry electrode manufacturing apparatus according to one embodiment provided by the present application;
fig. 3 is a left side view showing still another state of a strand processing apparatus of a dry electrode manufacturing apparatus according to an embodiment of the present application;
fig. 4 is a front view of a dry electrode manufacturing apparatus according to one embodiment provided by the present application.
Fig. 5 is a bottom view of an end cap of a rod processing apparatus in a dry electrode manufacturing apparatus according to one embodiment of the present application.
Reference numerals
An electrode manufacturing apparatus 100;
a strand processing device 10; a stock bin 11; a discharge end 111; a main body 112; a receiving cavity 1121; a feed inlet 1122; a discharge port 1123; a feed channel 1124; an end cap 113; a discharge hole 1131; a pressing space 114; a pressing plate 121; a screw 122;
a film forming device 20; a film forming roller 21;
a complex device 30; a composite roller 31;
unreeling device 40 of current collector 4;
a shaping device 50;
a winding device 60;
a dough 1; a material strip 2; a material film 3; a current collector 4; electrode sheet 5.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
A dry electrode manufacturing method according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the dry electrode manufacturing method according to an embodiment of the present application includes the steps of:
processing the fibrillated powder into powder clusters 1;
processing the powder mass 1 into a plurality of strips 2;
calendaring and thinning the plurality of strips 2 to form a film 3;
the material film 3 and the current collector 4 are compounded into an electrode plate 5.
Specifically, the electrode sheet 5 can be obtained by the dry electrode manufacturing method of the present application. The electrode plate 5 may be formed by compounding a material film 3 and a current collector 4, and the material film 3 may be an electrode film attached to the surface of the current collector 4. Alternatively, the raw materials for preparing the electrode film may include electrode powder and PTFE binder.
In the process of manufacturing the electrode sheet 5, the electrode powder and the PTFE binder may be mixed and the PTFE binder therein may be fibrillated to obtain a fibrillated powder. The electrode powder is a solid powder. Alternatively, the electrode powder and the PTFE binder may be stirred and sheared by a stirring device to mix the two and fibrillate the PTFE binder.
Processing the fibrillated powder into powder dough 1 may be the powder dough 1 processing step. Processing the powder mass 1 into a plurality of strands 2 may be a strand 2 processing step. Calendaring and thinning the plurality of strands 2 to form the web 3 may be a film forming process. Compounding the material film 3 and the current collector 4 into the electrode sheet 5 may be a compounding process.
The fibrillated powder can be processed into one or more dough pieces 1 such that at least a portion of the powder is bonded together to form a free standing dough structure.
The processed powder mass 1 can be processed into a plurality of strips 2, each strip 2 can be in a strip shape, and the strips 2 can be mutually dispersed. The manner in which the dough 1 is processed into the dough strip 2 may include, but is not limited to, extrusion molding and cutting molding.
The plurality of strips 2 formed by the process may be calendered and thinned into a film 3. In other words, the plurality of strips 2 may be connected to each other and stretched into a film-like structure by pressing the plurality of strips 2, while the thickness of the film-like structure may also be reduced by pressing to form the satisfactory film 3.
The formed material film 3 can be compounded with the current collector 4 to form the electrode sheet 5. The manner of compounding may include, but is not limited to, lamination, utilizing the adhesive properties of the PTFE adhesive to compound the membrane 3 with the current collector 4.
Alternatively, the plurality of strands 2 may be calendered and thinned using the film-forming roller 21 to form the web 3. In addition, the material film 3 and the current collector 4 may be roll-compounded into the electrode sheet 5 by using the compounding roller 31.
Thus, according to the dry electrode manufacturing method provided by the application, before the fibrillated powder is calendared and thinned to form the material film 3, the fibrillated powder is processed into the powder clusters 1, so that part or all of the raw materials can be combined to form a cluster structure, thereby reducing the pressure acting on a device for performing a film forming process and reducing the abrasion of the device. In addition, the powder mass 1 is processed into a plurality of material strips 2, so that the pressure applied during calendaring and thinning of the device can be further reduced, the abrasion of the device is further reduced, and the film forming quality is improved. In addition, the film 3 formed by calendaring and thinning the strip 2 is more stable and stronger.
According to one embodiment of the application, the processing of the dough 1 into a plurality of strands 2 comprises in particular the following steps:
feeding the dough 1 into a receiving cavity 1121 of a bin 11, the bin 11 having a plurality of discharge holes 1131 communicating with the receiving cavity 1121;
the dough 1 is extruded such that the dough 1 flows out of the receiving cavity 1121 through the plurality of discharge holes 1131 to form a plurality of strands 2 in one-to-one correspondence with the plurality of discharge holes 1131.
Specifically, after the processing of the dough 1 is completed, the dough 1 may be output and put into the receiving cavity 1121 of the bin 11, and the dough 1 may be extruded toward the plurality of discharge holes 1131 in the receiving cavity 1121, so that the dough 1 may be deformed into the plurality of strands 2 through the discharge holes 1131. The shape of the strip 2 may be related to the shape of the exit hole 1131. For example, the discharge hole 1131 is circular, the material strip 2 may be cylindrical, the discharge hole 1131 is square, and the material strip 2 may be quadrangular.
In this embodiment, the pellet 1 is put into the accommodating chamber 1121 and extruded, and the pressure toward the discharge hole 1131 is applied to the pellet 1 from the direction away from the discharge hole 1131, so that the pellet 1 sequentially flows out through the discharge hole 1131 of the silo 11, thereby extruding the pellet 1 into a plurality of strands 2. The shape and size of the strand 2 can be controlled by controlling the shape and size of the discharge hole 1131. The width of the formed material film 3 can be controlled by controlling the number of the discharging holes 1131 and the interval between the adjacent discharging holes 1131. Therefore, the discharge hole 1131 may be designed according to the required width of the material film 3.
According to other embodiments of the present application, the plurality of processed strips 2 are arranged at intervals along a preset direction, and the steps of calendaring and thinning the plurality of strips 2 to form the film 3 specifically include the following steps:
the plurality of strips 2 are respectively extruded from both sides in the arrangement direction of the plurality of strips 2 to form the material film 3. For convenience of explanation, a coordinate system as shown in fig. 2 to 4 may be established in which an X-axis direction, a Y-axis direction, and a Z-axis direction are perpendicular to each other. The preset direction may be the illustrated X-axis direction.
Alternatively, the preset direction may be the first horizontal direction. The plurality of strands 2 formed by processing the powder mass 1 may be arranged at intervals along the first horizontal direction. The plurality of strips 2 may constitute a strip group. In the film forming process, the groups of the strips may be brought close together and pressed in a second horizontal direction perpendicular to the first horizontal direction, thereby pressing each strip 2 into a sheet structure and extending the adjacent sheet structures in a direction close to each other until the adjacent sheet structures are connected to each other.
Specifically, as shown in fig. 2 to 4, the X-axis direction may be a first horizontal direction, the Y-axis direction may be a second horizontal direction, and the Z-axis direction may be a vertical direction. The plurality of strips 2 may be arranged at intervals along the X-axis direction, and the strip group may be pressed and approached along the Y-axis direction when the film forming process is performed.
In this embodiment, a plurality of strips 2 formed by processing are arranged along a preset direction, and the strips 2 are extruded from two sides of the arrangement direction of the strips 2, so that the formed material film 3 is more uniform, and the consistency of the material film 3 is improved.
In some embodiments of the present application, the step of compounding the material film 3 and the current collector 4 into the electrode sheet 5 specifically includes the steps of:
releasing the current collector 4 and allowing the current collector 4 to pass between the two material films 3;
two material films 3 are respectively extruded from both sides of the current collector 4 so that the two material films 3 are respectively attached to both sides of the current collector 4 to form electrode sheets 5.
Specifically, the two material films 3 may be processed through the powder dough 1 processing process, the strand 2 processing process, and the film forming process, and the two material films 3 may be spaced apart from each other.
The current collector 4 is released between the two material films 3 so that the current collector 4 passes between the two material films 3. For example, as shown in fig. 4, one of the two material films 3 may be positioned at the left side of the current collector 4, and the other of the two material films 3 may be positioned at the right side of the current collector 4. The two material films 3 and the current collector 4 located between the two material films 3 may constitute a component to be compounded.
The pressing force may be applied to the composite member from both sides of the composite member, and the direction of the pressing force may be the thickness direction of the material film 3. The two material films 3 can be attached to both sides of the current collector 4 by pressing, thereby forming the electrode sheet 5.
In this embodiment, the two material films 3 and the current collector 4 are structured by pressing, so that the two material films 3 and the current collector 4 are reliably connected, and the manufacturing process is simple and easy to implement.
According to some alternative embodiments of the present application, after the material film 3 and the current collector 4 are compounded into the electrode sheet 5, the method further comprises the steps of:
trimming the electrode sheet 5 formed by the combination;
and rolling the trimmed electrode sheet 5.
The electrode sheet 5 after the lamination may have uneven portions. By trimming the edge of the electrode sheet 5, an uneven portion on the electrode sheet 5 can be taken to improve the yield of the electrode sheet 5. The electrode plate 5 after trimming is rolled up, so that the electrode plate 5 can be stored, and the subsequent electrode plate 5 is convenient to use in the subsequent battery manufacturing process.
The dry electrode manufacturing apparatus 100 according to an embodiment of the present application is described in detail below with reference to the accompanying drawings.
As shown in fig. 2 to 4, the dry electrode manufacturing apparatus 100 according to an embodiment of the present application includes: a dough processing device (not shown), a strand processing device 10, a film forming device 20, and a compounding device 30.
Specifically, the powder dough processing device is used for processing the fibrillated powder into the powder dough 1. The powder dough processing apparatus may be disposed upstream of the strand processing apparatus 10. The strand processing device 10 is configured to receive the dough 1 and process the dough 1 into a plurality of strands 2, the strand processing device 10 having a discharge end 111, the plurality of strands 2 exiting from the discharge end 111. The film forming device 20 is disposed opposite the discharge end 111 for receiving and pressing the plurality of strands 2 to form the film 3. The compounding device 30 is provided downstream of the film forming device 20 and the current collector 4 unreeling device 40, and is used for receiving and compounding the film 3 and the current collector 4 to form the electrode sheet 5.
In other words, the dry electrode manufacturing apparatus 100 according to the embodiment of the present application is mainly composed of the powder dough processing device, the strand processing device 10, the film forming device 20, the current collector 4 unreeling device 40, and the compounding device 30.
The powder dough processing device may be disposed upstream of the strand processing device 10, or may be disposed separately from the strand processing device 10. The powder dough processing apparatus may process the fibrillated powder into powder dough 1, and the powder dough 1 may be transported and fed into the strand processing apparatus 10. The strand processing device 10 may process the powder mass 1 into a plurality of strands 2 and cause the plurality of strands 2 to flow out from its own discharge end 111.
The film forming device 20 may be located downstream of the strand processing device 10 and opposite the discharge end 111. Alternatively, the film forming device 20 may be adjacent to the discharge end 111. The plurality of strands 2 output from the strand processing device 10 may pass through the film forming device 20 and be calendered and thinned by the film forming device 20 to form the web 3. The film forming device 20 may output the material film 3 downstream.
The compounding device 30 may be disposed downstream of the film forming device 20 to receive the material film 3, while the compounding device 30 also receives the current collector 4 and composites the material film 3 and the current collector 4 to form the electrode sheet 5. The complex device 30 may output the electrode sheet 5.
Since the dry electrode manufacturing method according to the embodiment of the present application has the above technical effects, the dry electrode manufacturing apparatus 100 according to the embodiment of the present application also has the corresponding technical effects of reducing the pressure required for the film forming device 20 to press the raw material, reducing the abrasion to the film forming device 20, improving the service life of the film forming device 20, and at the same time, enhancing the stability and strength of the formed material film 3.
Optionally, the dry electrode manufacturing apparatus 100 may further include a stirring device, which may mix and fibrillate the raw materials.
According to one embodiment of the application, the strand processing apparatus 10 includes a magazine 11 and an extrusion assembly.
The storage bin 11 is internally provided with a containing cavity 1121, the containing cavity 1121 is used for containing the powder dough 1, the storage bin 11 is provided with a discharge end 111, the discharge end 111 is provided with a plurality of discharge holes 1131, and the plurality of discharge holes 1131 are mutually spaced and respectively communicated with the containing cavity 1121. At least a portion of the extrusion assembly is disposed within the receiving cavity 1121 and opposite the discharge end 111, the extrusion assembly being configured to extrude the dough 1 toward the discharge end 111 to drive the dough 1 through the discharge holes 1131 to form a plurality of strands 2.
In this embodiment, the strand processing apparatus 10 may be mainly composed of a hopper 11 and an extrusion assembly. The bin 11 may be provided with a receiving cavity 1121 therein, and the powder mass 1 may be thrown into the receiving cavity 1121 of the bin 11 and pressed in the receiving cavity 1121. Alternatively, the receiving cavity 1121 may be a cylindrical cavity.
One end of the silo 11 may be formed as a discharge end 111. For example, when the bin 11 is horizontally placed, the axis of the cylindrical cavity may extend in a horizontal direction, in which one end of the bin 11 may be formed as the discharge end 111. When the silo 11 is vertically placed, the axis of the cylindrical cavity may extend in a vertical direction, i.e. in the Z-axis direction as shown in fig. 2 and 3. In the vertical direction, the bottom end of the silo 11 may be formed as a discharge end 111.
The discharge end 111 may be provided with a plurality of discharge holes 1131 to allow the dough 1 to flow out when the dough 1 is extruded. The dough 1 may form a plurality of strands 2 after being shaped through the discharge holes 1131. Since the plurality of discharging holes 1131 are spaced apart from each other, the plurality of strands 2 may be distributed.
A portion or all of the compression assembly may be disposed within the receiving cavity 1121 with the portion of the compression assembly located within the receiving cavity 1121 opposite the discharge end 111. The extrusion assembly may extrude the dough 1 in a direction proximate to the discharge end 111, forcing the dough 1 out of the plurality of discharge holes 1131. The dough 1 may be a non-newtonian fluid that approximates a dough, so that the dough 1 may be extruded into strips as it exits the plurality of exit orifices 1131, forming a plurality of strips 2.
In this embodiment, the extrusion assembly is provided to apply pressure to the powder dough 1, so that the powder dough 1 forms the material strip 2 which is easier to be pressed into the material film 3, which is favorable for reducing the pressure required by the film forming process, further reducing the abrasion of the film forming device 20 caused by the film forming process, and improving the service life of the film forming device 20.
In some embodiments of the present application, the apertures of the plurality of exit holes 1131 may be the same or different. That is, the discharge end 111 may be provided with the discharge holes 1131 having the same hole diameter, or may be provided with the discharge holes 1131 having different hole diameters. The thickness of the material strips 2 can be controlled by the aperture of the discharge hole 1131, thereby controlling the width of the material film 3 made of a plurality of material strips 2. Accordingly, the aperture of the discharge hole 1131 may be designed according to the desired width of the material film 3 to produce material films 3 having different widths.
According to other embodiments of the application, the silo 11 comprises: a main body 112 and an end cap 113.
The main body 112 is provided with a containing cavity 1121, the main body 112 is provided with a feed inlet 1122 and a discharge outlet 1123, the feed inlet 1122 and the discharge outlet 1123 are communicated with the containing cavity 1121, and the feed inlet 1122 is used for inputting the powder dough 1. The end cover 113 is detachably covered on the discharge port 1123, and a plurality of discharge holes 1131 penetrate the end cover 113 along the thickness direction of the end cover 113.
The silo 11 of the present embodiment may be composed primarily of a main body 112 and an end cap 113. The inner hollow portion of the body 112 may be formed to accommodate the cavity 1121. The receiving chamber 1121 may communicate with the outside through a feed port 1122 and a discharge port 1123 on the main body 112. The dough 1 may be fed into the receiving cavity 1121 through the feed inlet 1122.
Optionally, a feeding channel 1124 may be disposed between the feeding port 1122 and the receiving cavity 1121, and the feeding port 1122 and the receiving cavity 1121 may communicate through the feeding channel 1124. For example, as shown in fig. 2 and 3, the feeding passage 1124 may include a horizontally disposed first passage and a vertically disposed second passage, a right end of the first passage may communicate with the receiving chamber 1121, a left end of the first passage may communicate with a lower end of the second passage, and an upper end of the second passage may be formed as the feeding port 1122.
In some alternative embodiments, the feed inlet 1122 may be flared open upward to facilitate directing the flow of the dough 1 into the feed channel 1124.
The end of the body 112 provided with the discharge port 1123 may be formed as the discharge end 111. The discharge port 1123 may be capped with an end cap 113, and the end cap 113 may close the discharge port 1123. A plurality of discharge holes 1131 may be provided on the end cover 113, and the discharge holes 1131 may penetrate the end cover 113 in a thickness direction of the end cover 113 such that the discharge holes 1131 communicate with the receiving cavity 1121.
For example, the bottom of the main body 112 may be provided with a discharge port 1123, the end cover 113 may be covered at the discharge port 1123 at the bottom of the main body 112, the discharge hole 1131 may penetrate the end cover 113 in the vertical direction, the upper end of the discharge hole 1131 is communicated with the accommodating cavity 1121, and the lower end of the discharge hole 1131 is communicated with the outside of the bin 11.
In addition, the end cap 113 is detachably connected to the silo 11. The end covers 113 with various specifications can be designed, and the proper end cover 113 is selected according to the width of the material film 3 required to be generated and is installed at the discharge port 1123 of the storage bin 11, so that the width of the material film 3 is controllable.
In other embodiments, the end cap 113 and the silo 11 may be a single piece to simplify the construction.
In some embodiments of the application, the extrusion assembly comprises: platen 121, screw 122 and drive (not shown).
The pressing plate 121 is movably arranged in the accommodating cavity 1121 to be close to or far away from the discharging end 111, the pressing plate 121 and the discharging end 111 cooperate to define an extrusion space 114, and the extrusion space 114 is used for accommodating the powder dough 1. One end of the screw 122 close to the discharge end 111 extends into the accommodating cavity 1121 and is connected with one side surface of the pressing plate 121 far away from the discharge end 111, and one end of the screw 122 far away from the discharge end 111 is located outside the accommodating cavity 1121. The driving member is connected to an end of the screw 122 remote from the discharge end 111 to drive the pressing plate 121 toward or away from the discharge end 111.
As shown in fig. 2, the pressing plate 121 may be disposed in the receiving cavity 1121. Alternatively, the shape and size of the pressing plate 121 may be adapted to the receiving cavity 1121, for example, the receiving cavity 1121 may be cylindrical and the pressing plate 121 may be a circular plate.
One side of the pressing plate 121 faces the discharge end 111 and cooperates with the discharge end 111 to define an extrusion space 114, and the dough 1 can enter the extrusion space 114 after being put into the accommodating cavity 1121.
One end of the screw 122 is close to the discharge end 111 and connected to the other side of the pressing plate 121, and the other end of the screw 122 is far away from the discharge end 111 and extends out of the accommodating cavity 1121 to be connected to a driving member. The driving member may drive the screw 122 toward or away from the discharge end 111, thereby causing the pressing plate 121 to be toward or away from the discharge end 111 to adjust the volume of the pressing space 114.
As shown in fig. 2, when the platen 121 is away from the discharge end 111, the platen 121 may be spaced apart from the powder mass 1 in the pressing space 114. As shown in fig. 3, when the pressing plate 121 is close to the discharge end 111, the pressing plate 121 may press the dough 1, so that the dough 1 is deformed into a shape adapted to the shaping space, and at the same time, the dough 1 flows out from the plurality of discharge holes 1131 on the discharge end 111 to form a plurality of strips 2.
Alternatively, the receiving cavity 1121 may be a cylindrical cavity extending in a vertical direction, the screw 122 may extend in a vertical direction, and the driving member may drive the screw 122 and the pressing plate 121 to move in a vertical direction. During the vertical downward movement of the pressing plate 121, the pressing plate 121 may press the dough 1 downward, so that the dough 1 flows downward from the plurality of discharging holes 1131.
In this embodiment, by providing the pressing plate 121 to press the dough, the powder dough 1 can be uniformly stressed, so that the formed plurality of strips 2 are uniform in size, and damage to the film forming device 20 caused by uneven pressure of the film forming device 20 when the plurality of strips 2 are pressed is avoided.
According to some alternative embodiments of the present application, at least one of the plurality of exit holes 1131 is a circular hole.
In other words, one or more of the plurality of exhaust holes 1131 may be a circular through hole. The circular hole may be circular in cross-section so that the strip 2 shaped through the discharge hole 1131 may be a cylindrical strip 2. The stability and strength of the formed web 3 can be improved after calendering and thinning the cylindrical web 2. At the same time, the cylindrical material strip 2 also reduces the risk of abrasion of the film forming device 20 by reducing the pressure required by the film forming device 20 to perform the film forming process.
According to other embodiments of the present application, at least a portion of the plurality of discharging holes 1131 are arranged at intervals along the preset direction, and the film forming device 20 includes two film forming rollers 21, the axes of the two film forming rollers 21 respectively extending along the preset direction, and the two film forming rollers 21 are spaced apart to receive and press the plurality of webs 2.
Specifically, as shown in fig. 5, the plurality of discharge holes 1131 may be arranged along a line so that the plurality of strands 2 flowing out of the discharge holes 1131 may be arranged along a line at intervals.
The film forming apparatus 20 may be mainly composed of two film forming rollers 21, the axes of the two film forming rollers 21 may be parallel to each other, and the axes of the two film forming rollers 21 may extend in the arrangement direction of the plurality of discharge holes 1131, respectively.
A gap may be formed between the outer circumferential surfaces of the two film forming rollers 21, and the gap of the two film forming rollers 21 may be opposite to the plurality of discharge holes 1131 so that the plurality of strands 2 may pass through the gap of the two film forming rollers 21. The two film-forming rollers 21 can be rotated in opposite directions to roll the plurality of strands 2, calender and thin the plurality of strands 2 into the web 3.
In this embodiment, the provision of two film-forming rollers 21 to receive and press the strand 2 can reduce the wear and pressure of the strand 2 on the roller surface and delay the service lives of the two film-forming rollers 21, as compared with the conventional two film-forming rollers directly pressing the fibrillated powder.
In some embodiments of the present application, the film forming device 20 is two, the dry electrode manufacturing apparatus 100 further includes a current collector 4 unreeling device 40 disposed between the two film forming devices 20, the current collector 4 unreeling device 40 is used for releasing the current collector 4 and allowing the current collector 4 to pass between the two material films 3 formed by the two film forming devices 20, and the compounding device 30 is located downstream of the current collector 4 unreeling device 40.
Specifically, each film forming apparatus 20 can produce and output one stock film 3. The two film forming devices 20 may be disposed at a distance such that the material films 3 output from the two film forming devices 20 may be spaced apart.
Alternatively, the number of the strand processing devices 10 may be two, and the two strand processing devices 10 are in one-to-one correspondence with the two film forming devices 20.
The current collector 4 unreeling device 40 may be disposed between the two film forming devices 20, and output the current collector 4 between the two material films 3 such that the current collector 4 may be sandwiched between the two material films 3. The current collector 4 unreeling device 40 may be a current collector 4 unreeling roller, and the current collector 4 may be wound on the current collector 4 unreeling roller.
The complex device 30 may be disposed downstream of the two film forming devices 20 and the current collector 4 unreeling device 40. The lamination device 30 may receive two sheets of material films 3 and one current collector 4 and laminate the two sheets of material films 3 on both sides of the current collector 4.
In some embodiments, the compounding device 30 can include two compounding rollers 31. The axes of the two composite rollers 31 may extend in the arrangement direction of the plurality of discharging holes 1131. The outer circumferential surfaces of the two composite rollers 31 can be spaced to form a roller gap, the two material films 3 and the one current collector 4 can pass through the roller gap of the two composite rollers 31, and the two composite rollers 31 can press the two material films 3 from two sides to a direction close to the current collector 4, so that the two material films 3 are pressed on the surface of the current collector 4.
According to some optional embodiments of the application, the dry electrode manufacturing apparatus 100 further comprises: the shaping device 50 winds up the device 60.
The shaping device 50 is disposed downstream of the composite device 30 and on one side of the electrode sheet 5, and is used for shaping the electrode sheet 5 output from the composite device 30. The winding device 60 is disposed downstream of the shaping device 50, and is used for winding the shaped electrode sheet 5.
Specifically, the shaping device 50 may include a doctor blade, which may be disposed at one side of the electrode sheet 5 output from the complex device 30. When the electrode plate 5 passes through the scraper, the scraper can trim uneven places on the electrode plate 5 so as to improve the yield of the electrode plate 5.
A winding device 60 may be disposed downstream of the shaping device 50, and the winding device 60 may receive the electrode sheet 5 shaped by the shaping device 50 and store the shaped electrode sheet 5. Alternatively, the winding device 60 may include a pole piece winding roller, and the pole piece winding roller may wind and store the electrode sheet 5 after being formed into a whole.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (15)
1. A method of manufacturing a dry electrode, comprising the steps of:
processing the fibrillated powder into a dough;
processing the powder mass into a plurality of strips;
calendaring and thinning the plurality of strips to form a film;
and compounding the material film and the current collector into an electrode plate.
2. The method of manufacturing a dry electrode according to claim 1, wherein processing the powder mass into the plurality of strands specifically comprises the steps of:
throwing a powder mass into a containing cavity of a bin, wherein the bin is provided with a plurality of discharging holes communicated with the containing cavity;
extruding the powder mass to enable the powder mass to flow out of the accommodating cavity through the plurality of discharging holes so as to form a plurality of strips corresponding to the plurality of discharging holes one by one.
3. The method of manufacturing a dry electrode according to claim 1, wherein the plurality of processed strips are arranged at intervals along a predetermined direction, and the steps of calendaring and thinning the plurality of strips to form the film specifically include the steps of:
and respectively extruding the plurality of strips from two sides of the arrangement direction of the plurality of strips to form the material film.
4. The method of manufacturing a dry electrode according to claim 1, wherein the step of combining the material film and the current collector into the electrode sheet specifically comprises the steps of:
releasing the current collector and allowing the current collector to pass between the two material films;
and respectively extruding the two material films from two sides of the current collector so that the two material films are respectively attached to two sides of the current collector to form electrode plates.
5. The method of manufacturing a dry electrode according to claim 1, further comprising, after compounding the material film and the current collector into an electrode sheet, the steps of:
trimming the electrode plate formed by compounding;
and rolling the trimmed electrode plate.
6. A dry electrode manufacturing apparatus, characterized in that the dry electrode manufacturing apparatus comprises:
a powder dough processing device for processing the fibrillated powder into the powder dough;
the material strip processing device is used for receiving the powder material clusters and processing the powder material clusters into a plurality of material strips, and is provided with a discharge end from which the material strips flow out;
the film forming device is arranged opposite to the discharging end and is used for receiving and extruding the plurality of strips to form a material film;
and the compounding device is arranged at the downstream of the film forming device and is used for receiving and compounding the material film and the current collector to form the electrode plate.
7. The dry electrode manufacturing apparatus according to claim 6, wherein the dry electrode manufacturing apparatus is configured to perform the dry electrode manufacturing method according to any one of claims 1 to 5.
8. The dry electrode manufacturing apparatus according to claim 6, wherein the strand processing device comprises:
the storage bin is internally provided with a containing cavity for containing the powder clusters, the storage bin is provided with a discharge end, the discharge end is provided with a plurality of discharge holes, and the discharge holes are mutually spaced and are respectively communicated with the containing cavity;
the extrusion assembly is arranged in the accommodating cavity and opposite to the discharge end, and is used for extruding the powder mass to the discharge end so as to drive the powder mass to pass through the discharge hole to form a plurality of strips.
9. The dry electrode manufacturing apparatus of claim 8, wherein the plurality of discharge holes have the same or different pore sizes.
10. The dry electrode manufacturing apparatus of claim 8, wherein the silo comprises:
the main body is internally provided with the accommodating cavity and is provided with a feed inlet and a discharge outlet, the feed inlet and the discharge outlet are communicated with the accommodating cavity, and the feed inlet is used for inputting the powder clusters;
the end cover is detachably arranged on the discharge hole in a covering mode, and the plurality of discharge holes penetrate through the end cover along the thickness direction of the end cover.
11. The dry electrode manufacturing apparatus of claim 8, wherein the pressing assembly comprises:
the pressing plate is movably arranged in the accommodating cavity to be close to or far away from the discharging end, and is matched with the discharging end to define an extrusion space for accommodating the powder clusters;
the screw rod is connected with one side surface of the pressing plate, which is far away from the discharge end, and one end of the screw rod, which is far away from the discharge end, is positioned outside the accommodating cavity;
the driving piece is connected with one end, far away from the discharge end, of the screw rod, so that the pressing plate is driven to be close to or far away from the discharge end.
12. The dry electrode manufacturing apparatus of claim 6, wherein at least one of the plurality of discharge holes is a circular hole.
13. The dry electrode manufacturing apparatus according to claim 6, wherein at least a part of the plurality of discharge holes are arranged at intervals in a preset direction, the film forming device includes two film forming rollers, axes of the two film forming rollers extend in the preset direction, respectively, and the two film forming rollers are spaced apart to receive and press the plurality of strands.
14. The dry electrode manufacturing apparatus according to claim 6, wherein the film forming means is two, the dry electrode manufacturing apparatus further comprising:
the current collector unreeling device is arranged between the two film forming devices and used for releasing the current collector and enabling the current collector to pass through between the two material films formed by the two film forming devices, and the compound device is positioned at the downstream of the current collector unreeling device.
15. The dry electrode manufacturing apparatus as claimed in claim 6, further comprising:
the shaping device is arranged at the downstream of the composite device and is positioned at one side of the electrode sheet and used for shaping the electrode sheet output by the composite device;
and the winding device is arranged at the downstream of the shaping device and is used for winding the shaped electrode plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837011.4A CN116825948A (en) | 2023-07-07 | 2023-07-07 | Dry electrode manufacturing method and dry electrode manufacturing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837011.4A CN116825948A (en) | 2023-07-07 | 2023-07-07 | Dry electrode manufacturing method and dry electrode manufacturing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116825948A true CN116825948A (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310837011.4A Pending CN116825948A (en) | 2023-07-07 | 2023-07-07 | Dry electrode manufacturing method and dry electrode manufacturing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116825948A (en) |
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2023
- 2023-07-07 CN CN202310837011.4A patent/CN116825948A/en active Pending
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