CN216084935U - Dry electrode pole piece film rolling device and dry electrode pole piece rolling system - Google Patents
Dry electrode pole piece film rolling device and dry electrode pole piece rolling system Download PDFInfo
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- CN216084935U CN216084935U CN202122421234.1U CN202122421234U CN216084935U CN 216084935 U CN216084935 U CN 216084935U CN 202122421234 U CN202122421234 U CN 202122421234U CN 216084935 U CN216084935 U CN 216084935U
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Abstract
The embodiment provides a dry electrode pole piece film rolling device and a dry electrode pole piece rolling system, and the rolling device comprises a first unwinding mechanism, a first winding mechanism and a first rolling mechanism which are oppositely arranged. When the rolling device works, the pole piece film is conveyed forwards to the first pressing roller mechanism under the action of the first unreeling mechanism and the reeling mechanism, and the large roller of the first pressing roller mechanism is matched with the at least two small rollers to gradually press the thick pole piece film into the thin pole piece film. The large-roller-diameter rolling equipment is beneficial to improving the compaction density of the pole piece film, and the small-roller-diameter rolling equipment is beneficial to improving the ductility of the pole piece film. The rolling device is combined with the big roller for rolling through a plurality of small rollers, the big roller keeps the pole piece film at a proper compacted density, the small roller keeps the pole piece film at a good ductility, the compacted density of the pole piece film is effectively prevented from being too high, the flexibility and tensile strength of the pole piece film are effectively improved, and the successful preparation of a subsequent dry electrode pole piece is ensured.
Description
Technical Field
The utility model relates to the technical field of lithium battery pole piece processing equipment, in particular to a dry electrode pole piece film rolling device and a dry electrode pole piece rolling system.
Background
The pole piece processing technology can be divided into a wet process and a dry process according to whether a solvent is used or not. The traditional wet process, which is the most common slurry coating process at present, is to uniformly mix an electrode active material, a conductive agent and a binder to prepare a liquid battery slurry mixture, and in order to ensure the fluidity of the battery slurry, the solvent content of the battery slurry is generally over 40%. The process of preparing the pole piece by the traditional coating process is also a process of heating and drying a large amount of solvent, which consumes huge electric power and energy consumption, and meanwhile, the production process of the pole piece needs to wait for the evaporation of the solvent, so that the production efficiency of the coating process is low.
The dry process theoretically does not need to add any solvent, the electrode sheet film can be prepared only by the fiberization of a dry adhesive under the solvent-free condition, and the dry electrode pole piece can be obtained by hot-pressing and compounding the electrode sheet film and a current collector. The process for preparing the pole piece film by the dry method does not need complex coating equipment, and the pole piece film can be prepared only by continuous heating and rolling.
The rolling device is the most central technical equipment in the dry electrode technology, and the rolling conditions and the selection of the rolling device have great influence on the dry technology. In order to obtain a pole piece with high compaction density by the wet coating pole piece rolling process, a large-roller-diameter heating rolling device is generally selected, the roller diameter reaches 600-800mm, and is even larger, and the larger the roller diameter of the rolling device is, the larger the compaction density of a pole piece film is.
The dry-process pole piece technology mainly comprises the steps of extending and thinning a pole piece film to about 100 mu m through multiple rolling, and then carrying out hot-pressing compounding on the pole piece film and a current collector to obtain the dry-process pole piece. In the process of rolling and extending the pole piece film, the pole piece film must keep a lower compaction density to maintain the processing characteristics of the pole piece film, but the existing rolling equipment directly uses large-roll-diameter rolling equipment to roll the dry pole piece film, so that the compaction density of the pole piece film is high, the pole piece film is brittle, the flexibility and the tensile strength are reduced, the preparation of a subsequent dry pole piece is very unfavorable, and the existing large-roll-diameter rolling equipment in the lithium battery industry is difficult to successfully prepare the dry pole piece film.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the defects that the dry electrode pole piece film is brittle, the flexibility and the tensile strength are reduced and the dry method pole piece preparation is not facilitated due to the fact that the dry electrode pole piece film is rolled by a large-roll-diameter rolling device in the prior art.
Therefore, the utility model provides a dry electrode pole piece film rolling device which comprises
The first unwinding mechanism and the winding mechanism are oppositely arranged; the first unwinding mechanism is used for conveying the pole piece film;
the first rolling mechanism is arranged between the first unwinding mechanism and the winding mechanism; the first rolling mechanism comprises at least one group of rolling assemblies, any group of rolling assemblies comprise a large roller and at least two small rollers arranged at the periphery of the large roller at intervals, the small rollers are tangent to the large roller, and the roller diameter of the large roller is larger than that of the small rollers.
Optionally, in the dry electrode sheet film rolling device, the outer periphery of the large roller is provided with a plurality of small rollers.
Optionally, in the dry electrode sheet film rolling device, a plurality of small rollers are distributed at equal intervals along the circumferential direction of the large roller.
Optionally, in the dry electrode sheet film rolling device, the rolling assemblies are at least two groups, wherein the two groups of rolling assemblies are arranged at intervals in the front-back direction, and the small rollers of the two groups of rolling assemblies are oppositely arranged on the upper side and the lower side of the two large rollers.
Optionally, in the dry electrode sheet film rolling device, the number of the small rolls in each group of rolling assemblies is the same.
Optionally, in the dry electrode sheet film rolling device, two groups of rolling assemblies are horizontally arranged at intervals.
Optionally, in the dry electrode sheet film rolling device, the two groups of rolling assemblies are vertically arranged at intervals.
The utility model provides a dry electrode sheet rolling system which comprises any one of the dry electrode sheet film rolling devices.
Optionally, in the dry electrode sheet rolling system, the two dry electrode sheet film rolling devices are arranged oppositely; the dry electrode pole piece rolling system also comprises
The second unwinding mechanism is arranged between the two electrode pole piece film rolling devices; the second unwinding mechanism is used for conveying a current collector;
the second rolling mechanism is arranged at the rear side of the electrode pole piece film rolling device and is provided with two second pressing rollers which are oppositely arranged and used for compounding the pole piece film and the current collector into a pole piece in a hot-pressing manner; the winding mechanism is arranged on the rear side of the second rolling mechanism.
Optionally, in the dry electrode sheet rolling system, a pre-pressing mechanism is arranged between the second unwinding mechanism and the second rolling mechanism, and the pre-pressing mechanism includes two oppositely-arranged pre-pressing rollers.
The technical scheme of the utility model has the following advantages:
1. when the dry electrode pole piece film rolling device provided by the utility model works, one end of a pole piece film is wound on the first unwinding mechanism, the other end of the pole piece film is wound on the winding mechanism, the first unwinding mechanism forwards conveys the pole piece film, the winding mechanism provides power at the rear side to wind the rolled pole piece film, the pole piece film is forwards conveyed to the first compression roller mechanism under the action of the first unwinding mechanism and the winding mechanism, and a large roller of the first compression roller mechanism is matched with at least two small rollers to gradually press the thick pole piece film into a thin pole piece film. The large-roller-diameter rolling equipment is beneficial to improving the compaction density of the pole piece film, and the small-roller-diameter rolling equipment is beneficial to improving the ductility of the pole piece film. The rolling device is combined with the big roller for rolling through a plurality of small rollers, the big roller keeps the pole piece film at a proper compacted density, the small roller keeps the pole piece film at a good ductility, the compacted density of the pole piece film is effectively prevented from being too high, the flexibility and tensile strength of the pole piece film are effectively improved, and the successful preparation of a subsequent dry electrode pole piece is ensured.
2. The rolling assemblies are arranged at intervals in the front and back, the small rollers of the two rolling assemblies are oppositely arranged on the upper side and the lower side of the two large rollers, the large rollers are positioned on the bottom surface of the pole piece film on the first rolling assembly, the compaction density of the bottom surface of the pole piece film is high, and the large rollers are positioned on the upper surface of the pole piece film on the second rolling assembly to compact the upper surface of the pole piece film so as to ensure the uniformity of the compaction density of the two surfaces of the pole piece film. The uniformity of the compaction density of the pole piece film can be ensured by arranging the two sets of rolling assemblies, and the equipment cost is saved.
The number of the small rollers outside each large roller is the same so as to ensure the rolling uniformity of the two surfaces of the pole piece film.
3. According to the dry electrode pole piece film rolling device provided by the utility model, the positive pole piece film and the negative pole piece film are flattened by the pre-pressing roller and then are subjected to hot pressing compounding with the current collector, so that the flatness of the upper surface and the lower surface of the dry electrode pole piece can be effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a dry electrode sheet film rolling apparatus provided in embodiment 1 of the present invention;
FIG. 2 is a schematic view of a dry electrode sheet film rolling apparatus provided in embodiment 2 of the present invention;
fig. 3 is a schematic view of a dry electrode sheet rolling system provided in example 2 of the present invention.
Description of reference numerals:
1-a first unwinding mechanism; 2-a winding mechanism; 31-a roll-in assembly; 311-first large roll; 312-a second large roll; 313-small rollers; 3-a second unwinding mechanism; 4-a second rolling mechanism; 51-a first pre-press roll; 52-second pre-press roll.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a dry electrode sheet film rolling device, as shown in fig. 1, which includes a first unwinding mechanism 1, a winding mechanism 2 and a first rolling mechanism, which are oppositely disposed. The first unwinding mechanism 1 is used for conveying an electrode sheet film; the first rolling mechanism is arranged between the first unwinding mechanism 1 and the winding mechanism 2; the first rolling mechanism comprises at least one group of rolling components 31, wherein any group of rolling components 31 comprises a large roller and at least two small rollers 313 arranged on the periphery of the large roller at intervals, the small rollers 313 are tangent to the large roller, and the roller diameter of the large roller is larger than that of the small rollers 313.
The dry electrode pole piece film rolling device with the structure has the advantages that during operation, one end of a pole piece film is wound on the first unwinding mechanism 1, the other end of the pole piece film is wound on the winding mechanism 2, the first unwinding mechanism 1 forwards conveys the pole piece film, the winding mechanism 2 provides power to wind the pole piece film finished through rolling at the rear side, the pole piece film is forwards conveyed to the first compression roller mechanism under the action of the first unwinding mechanism 1 and the winding mechanism 2, and the large roller and the at least two small rollers 313 of the first compression roller mechanism are matched to gradually press the thick pole piece film into a thin pole piece film. The large roller diameter rolling equipment is beneficial to improving the compaction density of the pole piece film, and the small roller 313 diameter rolling equipment is beneficial to improving the ductility of the pole piece film. The rolling device is combined with a large roller for rolling through a plurality of small rollers 313, the large roller keeps the pole piece film at a proper compacted density, the small rollers 313 keep the pole piece film at a good ductility, the compacted density of the pole piece film is effectively prevented from being too high, the flexibility and tensile strength of the pole piece film are effectively improved, and the successful preparation of the subsequent dry electrode pole piece is ensured.
Further, the first unwinding mechanism 1 is an unwinding roller, and the winding mechanism 2 is a winding roller. Referring to fig. 1, the large roller is provided at the outer circumference thereof with a plurality of small rollers 313, for example, the plurality of small rollers 313 are equally spaced in the circumferential direction of the large roller to roll the electrode sheet film in multiple stages. Or the small rollers 313 may be continuously distributed in the circumferential direction of the large roller.
After the pole piece film is extruded by the large roller, the compaction density of one surface of the pole piece film facing the large roller is larger than that of one surface of the pole piece film facing the small roller 313, and in order to eliminate the compaction density difference of the two surfaces of the pole piece film, at least two groups of rolling components 31 are arranged on each rolling device. Optimally, the rolling assemblies 31 are provided in two groups, the rolling assemblies 31 are arranged in a front-back spaced manner, the small rollers 313 of the rolling assemblies 31 are oppositely arranged on the upper side and the lower side of the two large rollers, the large rollers are arranged on the bottom surface of the pole piece film on the first group of rolling assemblies 31, the compaction density of the bottom surface of the pole piece film is high, and the large rollers are arranged on the upper surface of the pole piece film on the second group of rolling assemblies 31 to compact the upper surface of the pole piece film, so that the uniformity of the compaction density of the two surfaces of the pole piece film is ensured. The two sets of rolling assemblies 31 are arranged, so that the uniformity of the compacted density of the pole piece film can be ensured, and the equipment cost is saved.
For example, referring to fig. 1, the left rolling module 31 is a first rolling module 31, the large roller of the first rolling module is a first large roller 311, the right rolling module 31 is a second rolling module 31, the large roller of the first rolling module is a second large roller 312, the first large roller 311 is sequentially provided with 1, 2, 3 … n-level multi-level small rollers 313 on the periphery, the second large roller 312 is sequentially provided with S1, S2 and S3 … Sn-level multi-level small rollers 313 on the periphery, the number of the small rollers 313 on the periphery of each large roller can be set according to the roller diameter difference between the large roller and the small roller 313, when the roller diameter of the large roller is far larger than that of the small roller 313, the large roller can be provided with more small rollers 313 on the periphery, and when the roller diameter of the large roller is not greatly different from that of the small roller 313, two, three or four small rollers 313 can be provided on the periphery of the large roller. The pole piece film runs clockwise on the periphery of the first big roller 311 and runs anticlockwise on the periphery of the second big roller 312, namely the pole piece film is output by the last n-level small roller 313 of the first big roller 311, then winds between the S1 small roller 313 and the second big roller 312, and finally is output by the Sn-level small roller 313. The pole piece film is rolled by the first rolling assembly 31 and then conveyed to the second rolling assembly 31, the upper and lower rolling of the pole piece film are sequentially turned over, and the surface of the pole piece film facing the first large roller 311 faces the S1, S2 and S3 … Sn small roller 313, so that the difference of the upper and lower compacted densities of the pole piece film is eliminated, and the uniformity of the compacted density of the pole piece film is ensured.
Optimally, the number of the small rollers 313 in each group of the rolling assemblies 31 is the same, that is, the number of the small rollers 313 outside each large roller is the same, so as to ensure the uniformity of rolling on both sides of the pole piece film.
Referring to fig. 1, the two sets of rolling assemblies 31 may be horizontally disposed, or the two sets of rolling assemblies 31 may be obliquely disposed, as long as the small rollers 313 of the two sets of rolling assemblies 31 are oppositely disposed at the upper and lower sides of the two large rollers, so that the upper and lower surfaces of the electrode sheet film are rolled by the large rollers and the small rollers 313.
The large roller and the small roller 313 are combined, the rolling equipment has a compact structure, small occupied space and high rolling efficiency, and is suitable for large-scale mass production of dry electrode pole pieces.
Example 2
The embodiment provides a dry electrode pole piece film rolling device, referring to fig. 2, the difference from embodiment 1 is that two sets of rolling assemblies 31 are vertically arranged at intervals, the upper large roller is a first large roller 311, the lower large roller is a second large roller 312, and the pole piece film runs clockwise along the circumferential direction of the first large roller 311 and anticlockwise along the circumferential direction of the second large roller 312, so as to ensure the uniformity of the compacted density of the two surfaces of the pole piece film.
Example 3
The embodiment provides a dry electrode sheet rolling system, as shown in fig. 3, which includes a dry electrode sheet film rolling device, a second unwinding mechanism 3, and a second rolling mechanism 4.
The dry electrode pole piece film rolling devices are two, and the two electrode pole piece film rolling devices are arranged oppositely; the second unwinding mechanism 3 is arranged between the two electrode pole piece film rolling devices; the second unwinding mechanism 3 is used for conveying a current collector; the second rolling mechanism 4 is arranged at the rear side of the electrode pole piece film rolling device, the second rolling mechanism 4 is provided with two second pressing rollers which are oppositely arranged, and the second pressing rollers are used for hot-pressing and compounding the pole piece film and the current collector into a pole piece; the winding mechanism 2 is arranged on the rear side of the second rolling mechanism.
One end of the current collector is wound on the second unwinding mechanism 3, the other end of the current collector is wound on the winding mechanism 2, and the current collector is conveyed forwards under the matching action of the second unwinding mechanism 3 and the winding mechanism 2. For example, referring to fig. 3, two dry electrode sheet film rolling devices are arranged at intervals up and down, the upper rolling device is used for rolling and conveying a positive electrode sheet film, the lower rolling device is used for rolling and conveying a negative electrode sheet film, the current collector is converged with the positive electrode sheet film and the negative electrode sheet film at a second pressing roller, the second pressing roller is a metal roller with a heating function, and the current collector is hot-pressed and compounded with the positive electrode sheet film and the negative electrode sheet film to form a dry electrode sheet.
Further, a prepressing mechanism is arranged between the second unwinding mechanism 3 and the second rolling mechanism 4, and the prepressing mechanism comprises two opposite prepressing rollers. The two prepressing rollers are arranged at intervals up and down, the upper prepressing roller is a first prepressing roller 51, the lower prepressing roller is a second prepressing roller 52, the anode sheet film is wound to the first prepressing roller 51 after being output from the first rolling mechanism, and the first prepressing roller 51 flattens the surface of the anode sheet film; the negative electrode sheet film is output by the first rolling mechanism and then wound to the second prepressing roller 52, and the second prepressing roller 52 flattens the surface of the negative electrode sheet film; the positive plate film and the negative plate film are flattened by the pre-pressing roller and then are compounded with the current collector in a hot pressing manner, so that the flatness of the upper surface and the lower surface of the dry electrode plate can be effectively ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. A dry electrode pole piece film rolling device is characterized by comprising
The first unwinding mechanism (1) and the winding mechanism (2) are oppositely arranged; the first unwinding mechanism (1) is used for conveying the pole piece film;
the first rolling mechanism is arranged between the first unwinding mechanism (1) and the winding mechanism (2); the first rolling mechanism comprises at least one group of rolling assemblies (31), any group of rolling assemblies (31) comprises a large roller and at least two small rollers (313) arranged on the periphery of the large roller at intervals, the small rollers (313) are tangent to the large roller, and the roller diameter of the large roller is larger than that of the small rollers (313).
2. The dry electrode pole piece film rolling apparatus according to claim 1, wherein said large roll is provided with a plurality of said small rolls (313) on the outer circumference thereof.
3. The dry electrode pole piece film roll-in device of claim 2, wherein a plurality of small rolls (313) are equally spaced along the circumference of the large roll.
4. The dry electrode pole piece film rolling device according to any one of claims 1 to 3, wherein the rolling assemblies (31) have at least two groups, wherein the two groups of rolling assemblies (31) are arranged at intervals in front and back, and the small rollers (313) of the two groups of rolling assemblies (31) are oppositely arranged on the upper and lower sides of the two large rollers.
5. Dry electrode sheet film rolling apparatus according to claim 4, characterized in that the number of small rollers (313) per set of rolling assemblies (31) is the same.
6. The dry electrode pole piece film rolling device according to claim 4, wherein two groups of rolling assemblies (31) are horizontally arranged at intervals.
7. The dry electrode pole piece film rolling device according to claim 4, wherein two groups of rolling assemblies (31) are vertically spaced.
8. A dry electrode sheet rolling system, characterized by comprising the dry electrode sheet film rolling apparatus according to any one of claims 1 to 7.
9. The dry electrode sheet roll-in system of claim 8, wherein the dry electrode sheet roll-in system has two, two opposite roll-in devices; the dry electrode pole piece rolling system also comprises
The second unwinding mechanism (3) is arranged between the two electrode pole piece film rolling devices; the second unwinding mechanism (3) is used for conveying a current collector;
the second rolling mechanism (4) is arranged at the rear side of the electrode pole piece film rolling device, the second rolling mechanism (4) is provided with two second pressing rollers which are oppositely arranged, and the second pressing rollers are used for compounding a pole piece film and a current collector into a pole piece in a hot-pressing mode; the winding mechanism (2) is arranged on the rear side of the second rolling mechanism (4).
10. The rolling system for the dry electrode pole piece according to claim 9, wherein a pre-pressing mechanism is arranged between the second unwinding mechanism (3) and the second rolling mechanism (4), and the pre-pressing mechanism comprises two oppositely-arranged pre-pressing rollers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122421234.1U CN216084935U (en) | 2021-10-08 | 2021-10-08 | Dry electrode pole piece film rolling device and dry electrode pole piece rolling system |
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| CN202122421234.1U CN216084935U (en) | 2021-10-08 | 2021-10-08 | Dry electrode pole piece film rolling device and dry electrode pole piece rolling system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114975887A (en) * | 2022-06-27 | 2022-08-30 | 蔚来汽车科技(安徽)有限公司 | Processing method for dry electrode film and processing equipment for dry electrode film |
| CN116682929A (en) * | 2023-07-04 | 2023-09-01 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
| WO2024016207A1 (en) * | 2022-07-20 | 2024-01-25 | 宁德时代新能源科技股份有限公司 | Electrode sheet manufacturing apparatus and electrode sheet manufacturing method |
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2021
- 2021-10-08 CN CN202122421234.1U patent/CN216084935U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114975887A (en) * | 2022-06-27 | 2022-08-30 | 蔚来汽车科技(安徽)有限公司 | Processing method for dry electrode film and processing equipment for dry electrode film |
| 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 |
| WO2024016207A1 (en) * | 2022-07-20 | 2024-01-25 | 宁德时代新能源科技股份有限公司 | Electrode sheet manufacturing apparatus and electrode sheet manufacturing method |
| CN116682929A (en) * | 2023-07-04 | 2023-09-01 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
| CN116682929B (en) * | 2023-07-04 | 2024-02-20 | 肇庆理士电源技术有限公司 | Automatic production line for dry electrode preparation of power battery |
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