CN220821621U - Electrode preparation device - Google Patents
Electrode preparation device Download PDFInfo
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- CN220821621U CN220821621U CN202321245753.XU CN202321245753U CN220821621U CN 220821621 U CN220821621 U CN 220821621U CN 202321245753 U CN202321245753 U CN 202321245753U CN 220821621 U CN220821621 U CN 220821621U
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- thinning
- roller
- current collector
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- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 239000007772 electrode material Substances 0.000 claims abstract description 37
- 238000004804 winding Methods 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000012790 adhesive layer Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 13
- 238000010924 continuous production Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 15
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 238000010409 ironing Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007688 edging Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses an electrode preparation device, which comprises: the current collector winding and unwinding device comprises a current collector unwinding device, a pole piece winding device and a current collector, one end of the current collector is connected with the current collector unwinding device and is wound on the current collector unwinding device, and the other end of the current collector is connected with the pole piece winding device and is wound on the pole piece winding device; the film forming devices are positioned between the current collector unreeling device and the pole piece reeling device, are respectively arranged at two sides of the current collector, and are used for forming films of electrode materials and then arranged at two sides of the current collector to form pole pieces; and the feeding device is suitable for conveying the electrode material to the film forming device. According to the electrode preparation device, the electrode material film forming process and the electrode and current collector composite process after film forming are integrated, so that the continuous production operation of the electrode plate is realized, the electrode plate production flow is simplified, and the production efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of battery manufacturing, in particular to an electrode preparation device.
Background
Lithium ion device technology is a key technology for development of electric automobiles. The dry coating technology is one of the most advanced lithium ion battery manufacturing technologies at present, wherein the dry rolling tabletting process is the key of the procedure, and the dry rolling tabletting is the development direction of the process. However, the dry rolling tabletting technology used at present has the problems of complex process, high requirement on electrode film formation and difficult continuous production.
Disclosure of utility model
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the electrode preparation device which integrates the electrode material film forming process and the electrode and current collector composite process after film forming, thereby realizing the continuous production operation of the pole piece, simplifying the pole piece production flow and improving the production efficiency.
An electrode preparation apparatus according to an embodiment of the present utility model includes: the current collector winding and unwinding device comprises a current collector unwinding device, a pole piece winding device and a current collector, wherein the current collector unwinding device and the pole piece winding device are arranged at intervals, one end of the current collector is connected with the current collector unwinding device and is wound on the current collector unwinding device, and the other end of the current collector is connected with the pole piece winding device and is wound on the pole piece winding device; the film forming devices are positioned between the current collector unreeling device and the pole piece reeling device, the two film forming devices are respectively arranged at two sides of the current collector, the film forming devices are used for forming films of electrode materials and then are arranged at two sides of the current collector to form pole pieces, and the pole pieces are wound on the pole piece reeling device; and the feeding device is suitable for conveying electrode materials to the film forming device.
According to the electrode preparation device provided by the embodiment of the utility model, the current collector unreeling device and the pole piece reeling device which are mutually spaced are arranged, the current collector is arranged, the two ends of the current collector are respectively connected with the current collector unreeling device and the pole piece reeling device and are wound on the current collector unreeling device and the pole piece reeling device, the film forming device is arranged between the current collector unreeling device and the pole piece reeling device, and the two film forming devices are respectively arranged on the two sides of the current collector, so that the electrode after film formation can be directly compounded with the current collector, the electrode material film forming process and the compounding process integration of the electrode after film formation and the current collector are realized, the continuous production operation of the pole piece is realized, the pole piece production process is simplified, and the production efficiency is improved.
In some embodiments of the present utility model, the film forming apparatus includes: the feeding roller can rotate; the thinning mechanism comprises a thinning main roller and a thinning auxiliary roller, the thinning main roller and the thinning auxiliary roller are rotatable, the thinning main roller is positioned at one side of the feeding roller, which is close to the current collector, and are matched with each other, the feeding device is used for feeding materials between the thinning main roller and the feeding roller and forming a thick electrode film between the thinning main roller and the feeding roller, the thinning auxiliary roller is positioned at one side of the thinning main roller, which is far away from the feeding device, and the thinning auxiliary roller is matched with the thinning main roller and used for thinning the thick electrode film between the thinning main roller and the thinning auxiliary roller to form the thin electrode film; the composite roller is rotatable, the composite roller is located one side of the thinning main roller, which is close to the current collector, and is matched with the current collector, and the thin electrode film bypasses the composite roller, enters between the composite roller and the current collector and is arranged on the current collector.
In some embodiments of the utility model, the diameter of the feed roller is the same as that of the main thinning roller, and the diameters of the feed roller and the main thinning roller are 100-300mm; and/or the diameter of the thinning main roller is larger than that of the thinning auxiliary roller, the diameter of the thinning auxiliary roller is 100-250mm, and the ratio of the diameter of the thinning auxiliary roller to the diameter of the thinning main roller is 0.5-0.99; and/or the diameter of the composite roller is larger than that of the thinning main roller, and the diameter of the composite roller is 200-400mm.
In some embodiments of the utility model, the line speed of the thinning main roller and the feeding roller is the same; and/or the linear speed of the thinning main roller is greater than the linear speed of the thinning auxiliary roller, the ratio of the linear speed of the thinning main roller to the linear speed of the thinning auxiliary roller is A, and the A satisfies the following conditions: a is more than 1 and less than or equal to 2.
In some embodiments of the utility model, the temperature of the thinning main roller is greater than the temperature of the thinning auxiliary roller, and the temperature difference is 5-10 ℃; and/or the temperature of the feeding roller is less than the temperature of the thinning main roller; and/or the distance between the feeding roller and the thinning main roller is larger than the distance between the thinning main roller and the thinning auxiliary roller.
In some embodiments of the present utility model, the thinning mechanisms are multiple groups, the multiple groups of the thinning mechanisms are sequentially arranged in a direction from the feeding roller to the composite roller, and the thick electrode film is sequentially thinned in the multiple thinning mechanisms.
In some embodiments of the present utility model, in a direction from the feed roller to the composite roller, temperatures of the feed roller and the plurality of main thinning rollers are gradually increased, and a temperature difference between two adjacent stages is 5-20 ℃; and/or, along the moving direction of the electrode, the distance between the feeding roller and the thinning main roller close to the feeding roller and the distance between the thinning main roller and the thinning auxiliary roller in the thinning mechanisms are gradually decreased, and the difference between the adjacent two stages is 50-100 mu m.
In some embodiments of the utility model, an edging mechanism is provided on at least one surface of the thinning main roller and the composite roller.
In some embodiments of the utility model, the current collector is copper foil or aluminum foil, and the thickness of the current collector is 4-20 μm; and/or the surface of the current collector is provided with a carbon layer, or a conductive adhesive layer or a rough structure.
In some embodiments of the utility model, the electrode sheet is a positive electrode sheet or a negative electrode sheet.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of an electrode preparation apparatus according to an embodiment of the present utility model.
Reference numerals:
10. An electrode preparation device;
1. A current collector collecting and releasing device; 11. a current collector unreeling device; 12. a pole piece winding device; 13. a current collector; 14. a pole piece;
2. A film forming device; 21. a feed roller; 22. a thinning mechanism; 221. thinning the main roller; 222. thinning the auxiliary roller; 23. a composite roller;
3. And a feeding device.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
An electrode preparation apparatus 10 according to an embodiment of the present utility model is described below with reference to fig. 1.
As shown in fig. 1, an electrode preparation apparatus 10 according to an embodiment of the present utility model includes a current collector housing apparatus 1, a film forming apparatus 2, and a feeding apparatus 3.
Specifically, referring to fig. 1, the current collector winding and unwinding device 1 includes a current collector unwinding device 11, a pole piece winding device 12, and a current collector 13, where the current collector unwinding device 11 and the pole piece winding device 12 are arranged at intervals, one end of the current collector 13 is connected with the current collector unwinding device 11 and wound on the current collector unwinding device 11, and the other end of the current collector 13 is connected with the pole piece winding device 12 and wound on the pole piece winding device 12. Thus, the current collector unreeling device 11 can mount the current collector 13 and discharge the current collector 13, and the pole piece reeling device 12 can receive the pole piece 14 formed by combining the current collector 13 with the film-forming electrode material.
Further, the feeding device 3 is adapted to feed the electrode material to the film forming device 2. The film forming devices 2 are positioned between the current collector unreeling device 11 and the pole piece reeling device 12, the two film forming devices 2 are respectively arranged on two sides of the current collector 13, the film forming devices 2 are used for forming films of electrode materials and then are arranged on two sides of the current collector 13 to form pole pieces 14, and the pole pieces 14 are wound on the pole piece reeling device 12.
Thus, the electrode after film formation can be directly combined with the current collector 13 to form the electrode sheet 14. Compared with the electrode winding treatment after film forming, the electrode winding treatment after film forming and the current collector compounding into the electrode sheet can realize the integration of the electrode material film forming process and the compounding process of the electrode after film forming and the current collector 13, thereby realizing the continuous production operation of the electrode sheet 14, simplifying the production flow of the electrode sheet 14 and improving the production efficiency.
When the electrode preparation device 10 works, the feeding device 3 conveys electrode materials to the film forming device 2, the film forming device 2 forms films of the electrode materials, meanwhile, the current collector unreeling device 11 discharges the current collector 13, the electrode materials after film forming are arranged on two sides of the current collector 13 and form the pole pieces 14, and the pole piece reeling device 12 receives the pole pieces 14, so that the manufacture of the pole pieces 14 is completed.
According to the electrode preparation device 10 provided by the embodiment of the utility model, the current collector unreeling device 11 and the pole piece reeling device 12 which are mutually spaced are arranged, the current collector 13 is arranged, two ends of the current collector 13 are respectively connected with the current collector unreeling device 11 and the pole piece reeling device 12 and are wound on the current collector unreeling device, the film forming device 2 is arranged between the current collector unreeling device 11 and the pole piece reeling device 12, and the two film forming devices 2 are respectively arranged at two sides of the current collector 13, so that the electrode after film formation can be directly compounded with the current collector 13, the electrode material film forming process and the compounding process integration of the electrode after film formation and the current collector 13 are realized, the continuous production operation of the pole piece 14 is realized, the production flow of the pole piece 14 is simplified, and the production efficiency is improved.
In some embodiments of the present utility model, as shown in fig. 1, the film forming apparatus 2 includes a feed roller 21, a thinning mechanism 22, and a compounding roller 23.
The feeding roller 21 is rotatable, the thinning mechanism 22 comprises a thinning main roller 221 and a thinning auxiliary roller 222, the thinning main roller 221 and the thinning auxiliary roller 222 are rotatable, the thinning main roller 221 is located on one side, close to the current collector 13, of the feeding roller 21 and is matched with each other, the feeding device 3 is used for feeding materials between the thinning main roller 221 and the feeding roller 21 and forming films between the thinning main roller 221 and the feeding roller 21 to form a thick electrode film, the thinning auxiliary roller 222 is located on one side, far away from the feeding device 21, of the thinning main roller 221, and the thinning auxiliary roller 222 is matched with the thinning main roller 221 to conduct thinning treatment on the thick electrode film between the thinning main roller 221 and the thinning auxiliary roller 222 to form the thin electrode film.
It will be appreciated that there is a gap between the feed roller 21 and the main roller 221 and between the main roller 221 and the sub roller 222, and when electrode material enters the gap between the feed roller 21 and the main roller 221, the feed roller 21 and the main roller 221 squeeze it so that electrode material can be formed into a film, and a thick electrode film enters the gap between the main roller 221 and the sub roller 222 so that the thickness of the thick electrode film is reduced, thereby achieving thinning, forming a thin electrode film. Thus, the electrode material roll reduction is achieved by the multiple actions of the different rolls such as the feed roll 21, the reduction main roll 221, and the reduction sub roll 222, and the effect of electrode film formation can be improved and the working strength of the rolls in the film forming apparatus 2 can be reduced as compared to the electrode material roll reduction achieved by a single action of one roll.
Further, the composite roller 23 is rotatable, the composite roller 23 is located at one side of the thinning main roller 221 close to the current collector 13 and is matched with the current collector 13, and the thin electrode film bypasses the composite roller 23, enters between the composite roller 23 and the current collector 13 and is arranged on the current collector 13. Therefore, the current collector 13 and the thin electrode film are compounded by rolling the compound roller 23, so that the thin electrode film can be directly compounded with the current collector 13, and the production efficiency is improved.
In addition, since the two film forming devices 2 are respectively arranged at two sides of the current collector 13, the composite rollers 23 of the two film forming devices 2 are respectively arranged at two sides of the current collector 13, and the two composite rollers 23 jointly roll to act, so that the composite reliability of the thin electrode film and the current collector 13 is improved.
When the film forming device 2 works, the feeding device 3 firstly transmits electrode materials between the thinning main roller 221 and the feeding roller 21, the electrode materials are subjected to preliminary film forming through the combined action between the thinning main roller 221 and the feeding roller 21 to form a thick electrode film, then the thick electrode film is transmitted between the thinning main roller 221 and the thinning auxiliary roller 222 to realize further thinning treatment to form a thin electrode film, finally the thin electrode film is transmitted to the compound roller 23, and the thin electrode film and the current collector 13 are compounded through the rolling action of the compound roller 23 to form the pole piece 14.
The feeding device 3 is an intelligent uniform control system, and can automatically determine whether to feed according to the material amount between the thinning main roller 221 and the feeding roller 21, wherein the feeding thickness error (i.e. the difference between the thicknesses of the electrode materials at any two positions of the feeding device 3) is less than 1mm, such as 0.1mm, 0.3mm, 0.5mm or 0.9mm, etc., thereby improving the uniformity of film formation of the electrode materials and the film formation effect of the electrode materials.
In some embodiments of the present utility model, as shown in FIG. 1, the diameter of the feed roller 21 is the same as that of the ironing main roller 221, and the diameters of the feed roller 21 and ironing main roller 221 are 100-300mm, such as 100mm, 150mm, 200mm, 300mm, etc. Thereby, the feeding roller 21 and the thinning main roller 221 can make the electrode material roll uniformly when the electrode material is rolled.
If the diameters of the feed roller 21 and the main roller 221 are smaller than 100mm, the strength of the feed roller 21 and the main roller 221 is insufficient, and the film forming apparatus 2 is easily damaged because excessive pressure cannot be applied. If the diameters of the feeding roller 21 and the thinning main roller 221 are larger than 300mm, the contact arc length with the electrode material is longer, so that the pressure for rolling the electrode material is too small, and the film forming effect of the electrode material is poor. Accordingly, the diameters of the feed roller 21 and the thinning main roller 221 are 100-300mm, so that the electrode material film forming effect is good, the structural strength of the film forming device 2 is ensured, and the film forming device 2 is prevented from being damaged.
Further, the diameter of the thinning main roller 221 is larger than that of the thinning sub roller 222, the diameter of the thinning sub roller 222 is 100-250mm, such as 100mm, 150mm, 200mm or 250mm, and the ratio of the diameter of the thinning sub roller 222 to the diameter of the thinning main roller 221 is 0.5-0.99, such as 0.5, 0.6, 0.8 or 0.99, and the like. It can be understood that the diameter of the main thinning roller 221 is large, the structural strength is high, enough pressure can be borne, and the reliability of the main thinning roller 221 for transmitting high pressure is improved, so that the main thinning roller 221 has enough pressure when rolling the thick electrode film, and the thinning of the thick electrode film is realized. Since the diameter of the thinning sub roller 222 is small, the mechanism redundancy of the film forming apparatus 2 can be reduced, the installation space of the film forming apparatus 2 can be reduced, and the flexibility of the film forming apparatus 2 can be increased. Meanwhile, the diameter of the thinning auxiliary roller 222 is small, so that the fatigue strength of the thinning auxiliary roller 222 is improved, the service time of the thinning auxiliary roller 222 is prolonged, in addition, the diameter of the thinning auxiliary roller 222 is small, the rigidity is high, thinner steel strips can be rolled, and the thinning effect is improved.
The diameter of the composite roller 23 is larger than that of the thinning main roller 221, and the diameter of the composite roller 23 is 200-400mm, such as 200mm, 250mm, 300mm or 400 mm. Because the diameter of the composite roller 23 is larger, the structural strength is high, enough pressure can be born, and the reliability of the composite roller 23 for transmitting high pressure is improved, so that the composite roller 23 has enough pressure when rolling the thin electrode film and the current collector 13, and the thin electrode film and the current collector 13 are reliably fastened in a composite manner.
In some embodiments of the present utility model, as shown in fig. 1, the linear velocity of the thinning main roller 221 and the feed roller 21 is the same, so that the thickness of the formed thick electrode film is uniform.
The linear velocity of the thinning main roller 221 is greater than that of the thinning sub roller 222, and the ratio of the linear velocity of the thinning main roller 221 to that of the thinning sub roller 221 is a, which satisfies: a is more than 1 and less than or equal to 2, such as 1.2, 1.5, 1.8 or 2, etc. It can be understood that since the linear velocity of the main thinning roller 221 is greater than the linear velocity of the sub thinning roller 222, the moving velocity of the thick electrode film near the main thinning roller 221 is greater than the moving velocity of the electrode film near the sub thinning roller 222, so that the thick electrode film near the main thinning roller 221 extends in the advancing direction of the thick electrode film relative to the thick electrode film near the sub thinning roller 222, and the length of the thick electrode film is increased and the thickness is reduced, so that the thin electrode film is formed, and differential stretching thinning is realized, and the thinning effect is good.
In this case, if a is greater than 2, the movement speed of the electrode film near the main roll 221 side is easily made too fast, and breakage of the electrode film is caused. Therefore, A is less than or equal to 2, and the electrode film is prevented from being broken.
In some embodiments of the present utility model, as shown in fig. 1, the temperature of the ironing main roller 221 is greater than that of the ironing sub roller 222, and the temperature difference is 5-10 c, such as 5 c, 6 c, 8 c, 10 c, etc. It can be understood that the higher the temperature is, the weaker the deformation resistance of the electrode material is, the temperature of the thinning main roller 221 is higher than the temperature of the thinning sub roller 222, so that the thick electrode film near the thinning main roller 221 side is easier to deform than the thick electrode film near the thinning sub roller 222 side, so that the thickness of the thick electrode film is easier to reduce, thereby improving the thinning effect, while the thick electrode film near the thinning sub roller 222 side is less likely to deform, so that the thickness of the thick electrode film is less likely to reduce, thereby preventing the thick electrode film from being uncontrollable to be thinned, and preventing the thick electrode film from being excessively thinned. Therefore, the thickness of the thin electrode film formed after the thick electrode film is thinned can be controlled, the thick electrode film is prevented from being thinned excessively, and the thinning effect can be improved.
In addition, reducing the temperature of the reduction sub-roller 222 can reduce the consumption of energy, reduce damage to the reduction sub-roller 222 from high temperatures, and improve the life of the reduction sub-roller 222.
If the temperature difference between the main roller 221 and the sub roller 222 is greater than 10 ℃, uniformity of the thin electrode film is affected, and if the temperature difference between the main roller 221 and the sub roller 222 is less than 5 ℃, the thick electrode film is not easily thinned, and the thinning effect is poor. The difference between the temperature of the main roller 221 and the sub roller 222 is 5-10 deg.c, which can make the formed thin electrode film uniform and improve the thinning effect.
The temperature of the feed roller 21 is smaller than that of the thinning main roller 221, and thus, lowering the temperature of the feed roller 21 can reduce the consumption of energy, reduce damage to the feed roller 21 by high temperature, and improve the life of the feed roller 21.
The distance between the feeding roller 21 and the thinning main roller 221 is greater than the distance between the thinning main roller 221 and the thinning sub roller 222, and it is understood that the feeding roller 21 and the thinning main roller 221 are used for primarily rolling the electrode material into a film, and the distance between the feeding roller 21 and the thinning main roller 221 is greater, so that the pressure applied by the feeding roller 21 and the thinning main roller 221 can be reduced, thereby reducing damage to the feeding roller 21 and the thinning main roller 221, and prolonging the service lives of the feeding roller 21 and the thinning main roller 221. And the distance between the thinning main roller 221 and the thinning sub roller 222 is smaller than the distance between the feed roller 21 and the thinning main roller 221, the thinning action of the thick electrode film can be achieved.
In some embodiments of the present utility model, as shown in fig. 1, the thinning mechanisms 22 are plural sets, the plural sets of thinning mechanisms 22 are arranged in order in the direction from the feed roller 21 to the composite roller 23, and the thick electrode film is subjected to thinning processing in the plural thinning mechanisms 22 in order. Thus, the thick electrode film is formed into a thin electrode film through the thinning treatment of the plurality of groups of thinning mechanisms 22, so that the thinning effect is improved, meanwhile, the work of the thinning treatment is combined by the plurality of groups of thinning mechanisms 22, the working pressure of each group of thinning mechanisms 22 can be lightened, the requirement on the mechanical strength of the film forming device 2 is reduced, the film forming device 2 with lower mechanical strength can manufacture thinner pole pieces 14, and the applicability of the electrode preparation device 10 is improved.
In the example shown in fig. 1, the thinning mechanism 22 is two sets, but the present utility model is not limited thereto, and the thinning mechanism 22 may be more sets, such as 3 sets, 4 sets, 5 sets, 6 sets, or the like.
In some embodiments of the present utility model, as shown in fig. 1, in the direction of the feed roller 21 to the composite roller 23, the temperatures of the feed roller 21 and the plurality of main rolls 221 for thinning are gradually increased, and the temperature difference between the adjacent two stages is 5-20 ℃, such as 5 ℃,10 ℃, 18 ℃, 20 ℃, or the like.
It can be understood that the temperatures of the feed roller 21 and the plurality of thinning main rollers 221 are gradually increased in the direction from the feed roller 21 to the composite roller 23, so that breakage of the thick electrode film due to abrupt change in temperature can be prevented. Meanwhile, in the direction from the feed roller 21 to the composite roller 23, the temperatures of the feed roller 21 and the plurality of main thinning rollers 221 are gradually increased, so that when the thick electrode film is positioned between the feed roller 21 and the main thinning rollers 221 and between the main thinning rollers 221 and the auxiliary thinning rollers 222 in the direction from the feed roller 21 to the composite roller 23, the deformation resistance of the thick electrode film is gradually reduced, the thinning effect of the thick electrode film is gradually increased, the thickness of the thick electrode film is gradually reduced, and the thin electrode film is formed, thereby being more convenient to control the thickness of the formed thin electrode film, improving the thinning precision, and further improving the thinning effect.
Further, in the moving direction of the electrode, the distance between the feed roller 21 and the main roll 221 adjacent to the feed roller 21, the distance between the main roll 221 and the sub roll 222 in the plurality of thinning mechanisms 22 are gradually decreased, and the difference between the adjacent two stages is 50 to 100 μm, such as 50 μm, 60 μm, 70 μm, or 100 μm.
It is understood that the distance between the feed roller 21 and the main roller 221 adjacent to the feed roller 21, and the distance between the main roller 221 and the sub roller 222 in the plurality of thinning mechanisms 22 are gradually decreased in the moving direction of the electrode, so that the breakage of the thick electrode film caused by abrupt change of the distance can be prevented. Meanwhile, the thick electrode film is positioned between the feeding roller 21 and the thinning main roller 221 close to the feeding roller 21 along the moving direction of the electrode, and when the thick electrode film is positioned between the thinning main roller 221 and the thinning auxiliary roller 222 in the plurality of thinning mechanisms 22, the thinning effect of the thick electrode film is gradually increased, and the thick electrode film is gradually reduced to form the thin electrode film, so that the thickness of the formed thin electrode film is more convenient to control, the thinning precision is improved, and the thinning effect is improved.
In some embodiments of the present utility model, an edging mechanism is provided on at least one surface of the ironing main roller 221 and the composite roller 23. It will be appreciated that after the thick electrode film is thinned, the edge trimming mechanism in the composite roller 23 or the thinning main roller 221 can trim the edge of the thin electrode film, so that the edge of the thin electrode film is flat, and the manufacturing quality of the pole piece 14 is improved. The trimming mechanism may be a knife wheel or the like, and may be hidden in the thinning main roller 221 or the composite roller 23, for example, if the thin electrode film is detected to be close, the trimming mechanism may be exposed to trim the thin electrode film.
In some embodiments of the present utility model, the current collector 13 is copper foil or aluminum foil, and the thickness of the current collector 13 is 4-20 μm, such as 4 μm, 8 μm, 10 μm, or 20 μm, etc., whereby the conductivity of the current collector 13 may be improved.
The surface of the current collector 13 is provided with a carbon layer, or a conductive adhesive layer or a rough structure, so that the adsorption capacity of the current collector 13 can be improved, the thin electrode film can be conveniently separated from the composite roller 23 and adsorbed on the current collector 13, the thin electrode film and the current collector 13 can be tightly attached, and the manufacturing quality of the pole piece 14 can be improved.
In some embodiments of the utility model, pole piece 14 is a positive or negative pole piece. When the electrode sheet 14 is a positive electrode sheet, the electrode material may be one or more of ternary material, lithium-rich material, lithium iron phosphate, lithium iron manganese phosphate, lithium manganate or lithium nickel manganate, etc., and when the electrode sheet 14 is a negative electrode sheet, the electrode material may be one or more of artificial graphite, natural graphite, soft carbon, hard carbon or silicon-based material, etc. Thus, the electrode preparation device 10 can be adapted to manufacture different pole pieces 14 by changing the electrode material.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An electrode preparation apparatus, characterized by comprising:
The current collector winding and unwinding device comprises a current collector unwinding device, a pole piece winding device and a current collector, wherein the current collector unwinding device and the pole piece winding device are arranged at intervals, one end of the current collector is connected with the current collector unwinding device and is wound on the current collector unwinding device, and the other end of the current collector is connected with the pole piece winding device and is wound on the pole piece winding device;
The film forming device is located between the current collector unreeling device and the pole piece reeling device, the film forming device is two and is respectively arranged at two sides of the current collector, the film forming device is used for forming a film of an electrode material and then is arranged at two sides of the current collector to form pole pieces, the pole pieces are wound on the pole piece reeling device, and the film forming device comprises: the device comprises a feeding roller and a thinning mechanism, wherein the feeding roller is rotatable, the thinning mechanism comprises a thinning main roller and a thinning auxiliary roller, the thinning main roller and the thinning auxiliary roller are rotatable, the thinning main roller is positioned at one side of the feeding roller, which is close to the current collector, and are matched with each other, the feeding device is used for feeding materials between the thinning main roller and the feeding roller and forming a thick electrode film between the thinning main roller and the feeding roller, the thinning auxiliary roller is positioned at one side of the thinning main roller, which is far away from the feeding device, and the thinning auxiliary roller and the thinning main roller are matched with each other and are used for carrying out thinning treatment on the thick electrode film between the thinning main roller and the thinning auxiliary roller, so as to form the thin electrode film;
And the feeding device is suitable for conveying electrode materials to the film forming device.
2. The electrode preparation apparatus according to claim 1, wherein the film forming apparatus further comprises:
the composite roller is rotatable, is located one side of the thinning main roller, which is close to the current collector, and is matched with the current collector, and the thin electrode film after thinning enters between the composite roller and the current collector by bypassing the composite roller and is arranged on the current collector.
3. The electrode preparation device according to claim 2, wherein the diameter of the feed roller is the same as that of the main roll for thinning, and the diameters of the feed roller and the main roll for thinning are 100-300mm;
And/or the diameter of the thinning main roller is larger than that of the thinning auxiliary roller, the diameter of the thinning auxiliary roller is 100-250mm, and the ratio of the diameter of the thinning auxiliary roller to the diameter of the thinning main roller is 0.5-0.99;
And/or the diameter of the composite roller is larger than that of the thinning main roller, and the diameter of the composite roller is 200-400mm.
4. The electrode preparation apparatus according to claim 2, wherein the linear velocity of the thinning main roller and the feed roller is the same;
And/or the linear speed of the thinning main roller is greater than the linear speed of the thinning auxiliary roller, the ratio of the linear speed of the thinning main roller to the linear speed of the thinning auxiliary roller is A, and the A satisfies the following conditions: a is more than 1 and less than or equal to 2.
5. The electrode preparation apparatus according to claim 2, wherein the temperature of the thinning main roller is greater than the temperature of the thinning sub roller, and the temperature difference is 5-10 ℃;
And/or the temperature of the feeding roller is less than the temperature of the thinning main roller;
And/or the distance between the feeding roller and the thinning main roller is larger than the distance between the thinning main roller and the thinning auxiliary roller.
6. The electrode preparation apparatus according to claim 2, wherein the thinning mechanisms are provided in plural groups, the plural groups of the thinning mechanisms are sequentially arranged in a direction from the feed roller to the composite roller, and the thick electrode film is sequentially subjected to thinning processing in the plural thinning mechanisms.
7. The electrode preparation apparatus according to claim 6, wherein temperatures of the feed roller and the plurality of main rolls for thinning are gradually increased in a direction from the feed roller to the composite roller, and a temperature difference between adjacent two stages is 5 to 20 ℃;
And/or, along the moving direction of the electrode, the distance between the feeding roller and the thinning main roller close to the feeding roller and the distance between the thinning main roller and the thinning auxiliary roller in the thinning mechanisms are gradually decreased, and the difference between the adjacent two stages is 50-100 mu m.
8. The electrode preparation apparatus according to claim 2, wherein an edge trimming mechanism is provided on at least one surface of the thinning main roller and the composite roller.
9. The electrode preparation device according to claim 1, wherein the current collector is copper foil or aluminum foil, and the thickness of the current collector is 4-20 μm;
and/or the surface of the current collector is provided with a carbon layer, or a conductive adhesive layer or a rough structure.
10. The electrode preparation device of claim 1, wherein the electrode sheet is a positive electrode sheet or a negative electrode sheet.
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| CN202321245753.XU CN220821621U (en) | 2023-05-22 | 2023-05-22 | Electrode preparation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321245753.XU CN220821621U (en) | 2023-05-22 | 2023-05-22 | Electrode preparation device |
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| CN220821621U true CN220821621U (en) | 2024-04-19 |
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