CN116371701A - Process and device for pre-oiling lithium calendering - Google Patents
Process and device for pre-oiling lithium calendering Download PDFInfo
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- CN116371701A CN116371701A CN202310466828.5A CN202310466828A CN116371701A CN 116371701 A CN116371701 A CN 116371701A CN 202310466828 A CN202310466828 A CN 202310466828A CN 116371701 A CN116371701 A CN 116371701A
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- lithium
- oil
- belt
- lithium belt
- flexible substrate
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 231
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 221
- 238000003490 calendering Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 150
- 238000003860 storage Methods 0.000 claims description 54
- 230000007246 mechanism Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 12
- 239000010687 lubricating oil Substances 0.000 claims description 8
- 239000002480 mineral oil Substances 0.000 claims description 6
- 235000010446 mineral oil Nutrition 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 239000002173 cutting fluid Substances 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 239000010690 paraffinic oil Substances 0.000 claims 1
- 230000003449 preventive effect Effects 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 37
- 239000011248 coating agent Substances 0.000 abstract description 36
- 238000005498 polishing Methods 0.000 abstract description 23
- 238000007581 slurry coating method Methods 0.000 abstract description 17
- 238000000227 grinding Methods 0.000 abstract description 16
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 description 37
- 239000002184 metal Substances 0.000 description 37
- 239000002002 slurry Substances 0.000 description 16
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000001764 infiltration Methods 0.000 description 6
- 230000008595 infiltration Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000005192 partition Methods 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 239000005662 Paraffin oil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/02—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a process and a device for pre-oiling lithium calendering; wherein, a lithium rolling precoating oil process is a precoating oil step carried out before a lithium belt is subjected to rolling coating; the method comprises the steps of controlling the roughness Ra of the lithium belt to be not higher than 0.5 and performing oiling operation on the pre-oiling step, and specifically comprises the steps of realizing oiling operation on the surface of the lithium belt by utilizing a flexible substrate with liquid absorption property, and performing grinding and polishing on the lithium belt by adjusting the pressure of the flexible substrate on the surface of the lithium belt so as to control the roughness Ra of the lithium belt. According to the invention, through the mutual matching of oil coating and lithium belt grinding and polishing, the problem of adhesion between the lithium belt and a roller during subsequent calendaring coating is effectively solved, the uniformity of subsequent slurry coating is realized, the subsequent calendaring uniformity is further achieved, and the production continuity is finally ensured.
Description
Technical Field
The invention relates to the field of batteries, in particular to a process and a device for pre-oiling lithium calendering.
Background
In the lithium ion battery negative electrode lithium supplementing field, the lithium belt rolling lithium supplementing has the characteristics of high efficiency, high safety, low cost and the like. However, in the process of lithium supplementing by rolling a lithium strip, it is necessary to apply a rolling slurry to the lithium strip by using an application roll, and then to roll the lithium strip coated with the rolling slurry by using a rolling roll. In particular, see chinese patent application CN206878096U, a method for rolling a lithium strip coated with a slurry, which enters between a first rolling roller and a second rolling roller, by using the first rolling roller and the second rolling roller is disclosed, although the method discloses that a layer of slurry is coated on the surface of the lithium strip to adjust the release force of the surface of the lithium strip, so that the purpose of separating the lithium strip from a roller can be effectively achieved by avoiding using a separation film, in practice, during the process of coating the slurry by rolling the lithium strip, a phenomenon that a small amount of lithium adheres to a coating roller still exists, and as the process of coating the slurry by rolling is performed, the adhering lithium becomes worse, so that not only does the slurry coating unevenly affect the rolling uniformity of the subsequent metallic lithium, but also even when the slurry is too little on the surface of the coating roller, the slurry cannot be coated on some places, so that the phenomenon of white exposure occurs, and finally, the serious consequence that the subsequent continuous production cannot be achieved due to the time delay of the rolling is caused.
Aiming at the problem of the lithium adhesion coating roller, the prior art discloses that the isolation effect between the lithium belt and the coating roller is improved by oiling the surface of the lithium belt, so that the problem of adhesion between the lithium belt and the coating roller is avoided. For example: chinese patent application CN218190626U discloses a system and a method for oiling a lithium metal strip, and the system only proposes a method and a mechanism for oiling a lithium metal strip, wherein an oiling roller is contacted with an oil storage component, so that lubricating oil is adhered to the surface of the oiling roller, meanwhile, the lithium metal strip is pressed down to contact with the oiling roller through a pressing component, and the effect of coating the lubricating oil on the surface of the lithium metal strip is achieved by transferring the oil on the oiling roller onto the lithium metal strip. The mode can theoretically realize the coating of lubricating oil, and further improve the isolation effect between the lithium belt and the compression roller. However, in practice, due to the soft nature and high adhesiveness of the lithium belt, even if the oiling roller is used for coating lubricating oil, the problem of sticking the roller generated in the process of calendaring and sizing the lithium belt is not completely solved, but on the contrary, the oiling roller cannot be replaced at will, so that the problem of lithium sticking is generated in the process of oiling the lithium belt, and the effect is poor.
Disclosure of Invention
Accordingly, the present invention has been made to solve the problems occurring in the prior art when coating a lithium strip with a rolling paste, such as a lithium metal adhesion coating roll, and to provide a process and apparatus for pre-oiling a lithium rolling paste.
A process for lithium calendaring a pre-oil comprising: the lithium belt roughness Ra is controlled to be not higher than 0.5 and an oiling operation is performed.
The flexible substrate with the liquid absorption property is used for acting on the surface of the lithium belt to realize oiling operation, and meanwhile, the pressure of the flexible substrate acting on the surface of the lithium belt is adjusted to grind and polish the lithium belt so as to control the roughness Ra of the lithium belt; preferably, the lithium belt roughness Ra is 0.025 to 0.5.
The flexible substrate is made of a high-resilience material; preferably, the high resilience material is a sponge; more preferably, the density of the sponge is 18-45 kg/m 3 。
The pressure of the flexible substrate acting on the surface of the lithium belt is 5-255N.
The pressure is determined using the following equation one: f (f) 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), where f 1 Pressure is given in N; θ is the included angle between the running direction of the lithium band and the horizontal line; l (L) 1 The lithium band is provided with a unit of m; d, d 1 The lithium band thickness is given in mm.
The oil adopted in the oiling operation is one or more of lubricating oil, white mineral oil, paraffin oil, heat conduction oil, engine oil, silicone oil, rust-proof oil, hydraulic oil and cutting fluid.
A lithium calendaring pre-oiling device comprising:
the oil storage tank is provided with an oil outlet;
a flexible substrate disposed on the outlet and having liquid-absorbing properties;
the support roller is arranged at a position adjacent to the oil outlet and forms a lithium belt channel with the flexible substrate;
and the adjusting mechanism is arranged on the oil storage tank and is used for adjusting the pressure of the flexible substrate acting on the supporting roller.
A baffle plate for adjusting the width of the oil outlet is also arranged in the oil storage tank; preferably, the width of the oil outlet is 0.1-10 mm.
The flexible substrate is made of a high-resilience material; preferably, the high resilience material is a sponge; more preferably, the density of the sponge is 18-45 kg/m 3 。
The device for pre-oiling the lithium calendaring further comprises a roller for adjusting the running direction of the lithium belt to be the vertical direction.
The technical scheme of the invention has the following advantages:
1. the invention provides a process for pre-oiling lithium rolling, which is a pre-oiling step carried out before rolling and coating a lithium belt; the roughness Ra of the surface of the lithium belt is controlled to be not higher than 0.5, and oiling operations are matched with each other, so that the uniformity of slurry coating in the subsequent lithium belt rolling process is realized, the uniformity of subsequent rolling is ensured, and the production continuity is realized;
the implementation mechanism of the invention is as follows: the inventor researches find that the main factors of the roller for causing the adhesion coating of the metal lithium to the rolled slurry are two aspects, namely, the roughness Ra of the surface of the metal lithium is higher, and the phenomenon of sticking the roller is more easy to occur when the roller is coated with the rolled slurry; another aspect is the wetting characteristics of the metallic lithium surface. Specifically, the relative sliding property between lithium and the roller is affected by the infiltration characteristic of the surface of the metal lithium, when the wettability of the surface of the metal lithium is good, the relative sliding of the metal lithium and the roller is smooth, the phenomenon that the lithium on the surface of the lithium belt sticks to the roller due to relative dislocation left on the roller when the slurry is coated and rolled is avoided, and the intrinsic property of the metal lithium is determined, so that the self infiltration characteristic is also determined; the method aims to change the infiltration characteristic of the metal lithium, and only the infiltration characteristic of the surface of the metal lithium can be improved through oil coating, so that the method can play a good role in lubrication and lithium isolation in the subsequent calendaring of the slurry coating mechanism, and the phenomenon of lithium sticking to rollers is reduced. Therefore, the invention reduces the roughness Ra of the surface of the lithium belt, controls the roughness Ra to be not higher than 0.5, and simultaneously, coats oil on the surface of the lithium belt to improve the infiltration characteristic of the lithium belt, thereby achieving the purpose of reducing the coating roller of the metal lithium adhesive coating calendaring slurry. In summary, the invention effectively achieves the aim of avoiding the adhesion of the metal lithium to the roller coated with the calendaring slurry by improving the infiltration characteristic of the surface of the metal lithium and adjusting the roughness of the lithium belt to cooperate together, realizes the uniformity of slurry coating, further achieves the subsequent calendaring uniformity, and finally ensures the continuity of production.
2. In the process for pre-oiling the lithium rolling, the method for controlling the roughness Ra of the surface of the lithium belt is further optimized, and the method for oiling the surface of the lithium belt is realized while the roughness Ra of the surface of the lithium belt is controlled, so that the operation is simpler. Specifically, the flexible substrate with liquid absorption property is used for acting on the surface of the lithium belt to realize oil coating, and meanwhile, the pressure of the flexible substrate acting on the lithium belt is adjusted to realize the leveling and polishing of the lithium belt; according to the invention, the flexible substrate is utilized to grind and polish the lithium belt, so that the roughness Ra of the lithium belt can be effectively reduced under the condition of not damaging the lithium belt, and the problem of roller adhesion of the subsequent lithium belt during calendaring and coating is effectively solved through the mutual cooperation of oil coating and lithium belt grinding and polishing. The inventor finds that too small roughness can cause slipping of an oiling roller to affect the reaction of the load calendaring slurry, so that the invention further optimizes the surface roughness Ra of the lithium belt after grinding and polishing, and effectively realizes the uniformity of subsequent slurry coating by controlling the surface roughness Ra of the lithium belt after grinding and polishing to be 0.025-0.5, further ensures the subsequent calendaring uniformity and realizes the production continuity.
3. In the process for pre-oiling the lithium calendaring, the adopted flexible substrate is preferably a high-resilience material, more preferably a sponge, the flexible substrate can be conveniently replaced, when the flexible substrate is selected as the sponge, even if a small amount of lithium is attached, the flexible substrate has little influence on oiling operation, and the sponge can be replaced regularly when the sponge is attached with the lithium, so that the oiling effect is better ensured.
4. In the process for pre-oiling the lithium calendaring, the pressure of the flexible substrate on the lithium belt can be further optimally controlled, so that the purpose of controlling the surface roughness Ra of the lithium belt after the polishing can meet the requirement, and the effect of polishing the lithium belt can be further achieved. Specifically, the pressure of the flexible substrate against the lithium strip is typically 5 to 255N; in order to obtain the pressure for enabling the surface roughness Ra of the lithium belt to reach 0.025-0.5 more accurately, the pressure can be determined by adopting a formula I of the invention, wherein the formula I is specifically as follows: f (f) 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), where f 1 Pressure is given in N; θ is the included angle between the running direction of the lithium band and the horizontal line; l (L) 1 The lithium band is provided with a unit of m; d, d 1 The thickness of the lithium belt is in mm, and the surface roughness Ra of the lithium belt after treatment can reach 0.025-0.5 by controlling the pressure value acting on the surface of the lithium belt under the pressure condition calculated by the formula I.
5. The invention provides a lithium calendaring pre-oiling device, which comprises an oil storage tank, a flexible substrate, a supporting roller and an adjusting mechanism, wherein the oil storage tank is arranged on the flexible substrate; the oil storage tank is provided with an oil outlet, the flexible substrate is arranged on the oil outlet and has a liquid absorption property, the supporting roller is arranged at a position adjacent to the oil outlet and forms a lithium belt channel with the flexible substrate, and the adjusting mechanism is arranged on the oil storage tank and is used for adjusting the pressure of the flexible substrate acting on the supporting roller. Through the mutual cooperation of oil storage tank, flexible substrate, backing roll and adjustment mechanism, can effectively realize simultaneously the surface coating oil in the lithium area and carry out the effect of grinding and polishing to the lithium area, avoid lithium area and roll adhesion to provide equipment support when carrying out the calendering coating for follow-up lithium area.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a lithium rolling pre-oiling device according to this invention;
FIG. 2 is a schematic view of the external structure of the oil reservoir of the present invention;
FIG. 3 is a schematic cross-sectional view of a reservoir according to the present invention;
FIG. 4 is a schematic diagram of a cross-sectional structure of a second embodiment of the oil reservoir according to the present invention;
wherein reference numerals in the respective figures correspond to the following:
1-oil storage tank, 2-flexible substrate, 3-backing roll, 4-pass roller, 5-lithium belt, 6-rubber roll, 7-steel roll, 8-baffle.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field.
Example 1
The lithium calendaring pre-oiling device is shown in fig. 1, and the specific structure of the device comprises an oil storage tank 1, a flexible substrate 2, a supporting roller 3 and an adjusting mechanism; the oil storage tank 1 is provided with an oil outlet, the flexible substrate 2 is arranged on the oil outlet and has a liquid absorption property, the supporting roller 3 is arranged at a position adjacent to the oil outlet and forms a lithium belt channel with the flexible substrate 2, and the adjusting mechanism is arranged on the oil storage tank and is used for adjusting the pressure of the flexible substrate acting on the supporting roller.
The process for realizing coating oil and grinding and polishing of the lithium belt by adopting the device for pre-oiling the lithium calendaring comprises the following steps: after one end of a metal lithium belt passes through a lithium belt between a flexible substrate 2 and a supporting roller 3 thereof, the pressure of the flexible substrate 2 acting on the lithium belt 5 is regulated by an regulating mechanism, so that the surface of the lithium belt can be ground and polished while oil is coated, the metal lithium belt enters a rolling slurry coating system after oil coating and grinding and polishing of the flexible substrate 2, the rolling slurry is coated on the metal lithium belt through a rubber roller 6 and a steel roller 7 in the system, and then the lithium belt coated with the rolling slurry is sent into a metal lithium rolling mechanism for rolling forming.
In the invention, the pressure f between the flexible substrate 2 and the lithium belt is mainly regulated 1 When the pressure f 1 The reservoir 1 with the flexible substrate 2 can, where appropriate, simultaneously produce a metallic lithium surface-smoothing and polishing effect during the pre-oiling process. When the pressure of the flexible substrate 2 acting on the lithium belt is regulated by the regulating mechanism, the pressure can be monitored in real time through the pressure real-time monitoring device arranged on the supporting roller 3, the supporting roller 3 is a free roller, the flexible substrate 2 is driven to extrude the lithium belt by regulating the position of the oil storage tank 1 based on the regulating mechanism, the force applied to the lithium belt is transmitted to the supporting roller 3, therefore, the acting force applied to the supporting roller 3 is the same as the force applied to the lithium belt by the flexible substrate 2, and the force applied to the lithium belt by the supporting roller 3 is detected to be the force applied to the lithium belt by the flexible substrate 2. Specifically, the pressure f between the oil storage tank 1 and the support roller 3 is regulated by monitoring the stress of the support roller 3 in real time 1 F is as follows 1 Can be adjusted between 5 and 250N. The adjustment mechanism is a mechanism for moving the position of the oil reservoir 1 to adjust the force applied to the lithium belt by the flexible substrate 2, including but not limited to a linear movement stepper motor or the like.
In the invention, grind to flatThe roughness Ra of the lithium belt after polishing is controlled to be not higher than 0.5, preferably 0.025-0.5, so that the uniformity of subsequent slurry coating is effectively realized, the subsequent calendaring uniformity is further ensured, and the production continuity is realized. While the roughness Ra of the lithium belt is controlled to be within 0.5, the pressure f between the flexible substrate 2 and the lithium belt can be adjusted 1 To achieve, in general, only the pressure f 1 The requirement of the roughness Ra of the lithium band can be met by controlling the pressure to be 5-255N, but in order to achieve the purpose of more accuracy, the pressure required by grinding and polishing can be obtained more accurately through a formula I, and the method is specifically as follows:
the first formula is: f (f) 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), where f 1 Pressure is given in N; θ is the included angle between the running direction of the lithium band and the horizontal line; l (L) 1 The lithium band is provided with a unit of m; d, d 1 The lithium band thickness is given in mm.
The structure of the oil storage tank can be cylindrical or other non-circular structures. In other non-circular structures, the oil outlet is arranged at the bottom of the oil storage tank, and the oil outlet is rectangular, as shown in fig. 2, in the structure, the oil coating amount can be determined through the width W of the oil outlet, and the coating range can be determined through the length L of the oil outlet, so that the length L of the oil outlet is matched with the width of the lithium belt. The width W of the oil outlet at the bottom of the oil storage tank is designed to be adjustable, and the width range is 0.1-10 mm. In order to better adapt to the application of lithium strips with different widths, in the embodiment, the partition plate 8 can be arranged inside the oil storage tank 1, the adjustment of the oil outlet length L can be effectively realized through the partition plate, and the lithium strip with different widths can be effectively applied to the application without replacing the oil storage tank and the flexible substrate 2, so that the application range is wider. Meanwhile, the number of the partition plates 8 provided inside the oil reservoir 1 may be one as shown in fig. 3 a; the number of the two oil outlets can be two, as shown in fig. 3 b, and the positions of the oil outlets on the oil storage tank 1 can be more accurately adjusted by the arrangement of the two partition plates 8, so that the oil storage tank is more convenient to be matched with a lithium belt.
When the structure of the oil storage tank is cylindrical, a plurality of through holes which are uniformly distributed can be formed in the cylindrical cambered surface, the through holes can be round or square, and the like, and the oil outlet of the oil storage tank 1 is formed by the plurality of through holes together, as shown in fig. 4, wherein a in fig. 4 is a schematic sectional view of the cylindrical oil storage tank in the radial direction, and b in fig. 4 is a schematic sectional view of the cylindrical oil storage tank in the axial direction. When the structure of the oil storage tank is cylindrical, the oil storage tank is an oil roller, and the flexible substrate is wrapped on the arc surface of the oil roller for one circle, and under the structure, when the oil coating operation is carried out, the cylindrical oil storage tank 1 slides and rolls on a lithium belt to jointly finish the oil coating and grinding polishing actions; the oil coating amount of the oil roller can be adjusted by the number of through holes, the pore size and the inter-pore distance arranged on the roller surface, the oil coating range can be adjusted by arranging a baffle plate 8 inside the oil storage tank, the baffle plate 8 can be arranged on one side of the oil roller in the axial direction, as shown by b in fig. 4, the number of the baffle plates 8 can be two, and the baffle plates 8 are respectively positioned on two opposite sides of the oil roller in the axial direction.
In the invention, the oil in the oil storage tank can be one or more of lubricating oil, white mineral oil, paraffin oil, heat conduction oil, engine oil, silicone oil, rust-proof oil, hydraulic oil, cutting fluid and the like; to ensure the application of oil, the amount of oil in the reservoir should be no less than 15% of the total volume of the reservoir.
And the oil storage tank is also provided with an oil filling hole for adding oil.
The flexible substrate 2 has the liquid absorption property, so that the oil in the oil storage tank 1 can be transferred to the surface of the lithium belt, and meanwhile, the flexible substrate 2 is made of flexible materials, so that the polishing of the lithium belt can be realized under the condition of not damaging the surface of the lithium belt; in order to achieve better and more controllable oil application and leveling polishing, the flexible material 2 of the present invention is preferably a high-resilience material with liquid-absorbing properties, such as a sponge, the density of which in this embodiment is preferably 18-45 kg/m 3 。
Since the direction of the lithium belt between the oil storage tank 1 and the supporting roller is not necessarily the vertical direction, in order to facilitate the smooth feeding of the oiled lithium belt into the subsequent calendaring coating process, the apparatus for pre-oiling lithium calendaring according to the present invention further comprises a passing roller 4 for adjusting the running direction of the lithium belt to the vertical direction, as shown in fig. 1.
Example 2
An oiling mechanism with a trapezoid oil storage tank 1 is adopted, wherein the width W of an oil outlet at the lower end of the oil storage tank 1 is set to be 1.1mm, and 25# white mineral oil with the total volume of 75% is added into a tank; width of lithium metal strip l 1 0.115m, lithium band thickness d 1 The included angle theta between the lithium belt and the horizontal plane is set to be 60 degrees and the length L of the oil storage tank 1 is 135mm by adjusting the baffle plate 8 according to the metal lithium belt width, the oil storage tank 1 adopts high-rebound medium-density sponge, and the density is 21kg/m 3 The oil storage tank 1 and the support roller 3 are arranged in a clamping state.
Based on formula one, f 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), the pressure f between the reservoir 1 and the backup roll 3 is calculated 1 At 40N, a pressure f between the backup roll 3 and the reservoir 1 is required 1 The fluctuation was + -3N, and at this time, the roughness Ra of the surface of the polished lithium belt was 0.27. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 3
The oiling mechanism in the form of a barrel-shaped oil storage tank 1 in the pattern shown in fig. 4 is adopted, 3 pairs of symmetrical circular holes (equally dividing the circumference into 360 degrees) are formed on the oil roller by taking the shaft as the center, the diameter of each hole is set to be 2.5mm, the distance between the holes and the level of each hole is set to be 3.0cm, the partition plate 8 is regulated to ensure that the width of an oiling surface is 170mm, 85% of oil with the total volume is added into the oil storage tank 1, the oil is prepared by silicone oil with the viscosity of 100cps and 32# antiwear hydraulic oil according to the proportion of 1:0.25, and the outer surface of the oil roller adopts high-rebound medium-density sponge with the density of 30kg/m 3 The sponge had a thickness of 1.5cm, and the oil roller and the backup roller 3 were similarly placed in a clamped state therebetween. The lithium metal band in this embodiment has a width l 1 0.150m, lithium band thickness d 1 The angle θ between the lithium strip and the horizontal was set at 54 ° at 2.48 mm.
Based on formula one, f 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), the pressure f between the reservoir 1 and the backup roll 3 is calculated 1 Set to 55N, a pressure f between the support rollers 3 is required 1 The fluctuation is within +/-3N, at the moment, the roughness Ra of the surface of the polished lithium belt is 0.19, the function of precoating the surface of the metal lithium belt with oil can be finished through the operation, the surface of the metal lithium belt reaches the polished state after being coated with oil, and the phenomenon of sticking rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 4
An oiling mechanism with a trapezoid oil storage tank 1 is adopted, as shown in the patterns of fig. 2-3, the width W of an oil outlet at the lower end of the oil storage tank 1 is set to be 3.0mm, 25# white mineral oil with the total volume of 75% is added into a tank, and a metal lithium belt is provided with a bandwidth l 1 0.39m, lithium band thickness d 1 An included angle theta between the lithium band and the horizontal plane is set to be 25 DEG according to the width l of the metal lithium band, wherein the included angle theta is 3.5mm 1 The baffle plate 8 is adjusted to ensure that the length L of the oil storage tank 1 is 400mm, the oil storage tank 1 adopts high-resilience medium-density sponge, and the density is 21kg/m 3 The oil storage tank 1 and the support roller 3 are arranged in a clamping state.
Based on formula one, f 1 ＝3.5·(5·tan 3 θ·l 1 ·d 1 2 +3.8), at which point the pressure f between the reservoir 1 and the support roller 3 is calculated 1 22N, but in this embodiment the actual pressure between the reservoir 1 and the support roller 3 is adjusted to 15N, requiring a pressure f between the support roller 3 1 The fluctuation was + -3N, and at this time, the roughness Ra of the surface of the polished lithium belt was 0.39. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 5
An oiling mechanism with a trapezoid oil storage tank 1 is adopted, wherein the width W of an oil outlet at the lower end of the oil storage tank 1 is set to be 4.5mm, and 25# white mineral oil with the total volume of 75% is added into a tank; width of lithium metal strip l 1 0.28m, lithium band thickness d 1 An included angle θ between the lithium band and the horizontal plane was set to 70 ° at 1.53mmAccording to the width l of the metal lithium band 1 The length L of the oil storage tank 1 is 300mm by adjusting the baffle plate 8, the oil storage tank 1 adopts high-resilience medium-density sponge, and the density is 21kg/m 3 The oil storage tank 1 and the support roller 3 are arranged in a clamping state.
Based on formula one, f 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), at which point the pressure f between the reservoir 1 and the support roller 3 is calculated 1 Set to 250N, a pressure f between the backup rolls 3 is required 1 The fluctuation was + -3N, and at this time, the roughness Ra of the surface of the polished lithium belt was 0.07. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 6
The difference from example 2 is that the pressure between the oil reservoir 1 and the backup roll 3 is adjusted to 5.2N, requiring the pressure f between the backup roll 3 1 The fluctuation was + -3N, and at this time, the roughness Ra of the surface of the polished lithium belt was 0.5. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 7
The difference from example 2 is that the pressure between the oil reservoir 1 and the backup roll 3 is adjusted to 248N, requiring the pressure f between the backup roll 3 1 The fluctuation was + -3N, and at this time, the roughness Ra of the surface of the polished lithium belt was 0.025. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 8
The difference from example 2 is that a sponge having a density of 45kg/m is used 3 The pressure between the oil reservoir 1 and the backup roller 3 is adjusted to 40N, and the pressure f between the backup roller 3 is required 1 Fluctuation is + -3N, and at this time, the roughness of the surface of the polished lithium belt is flattenedThe degree Ra is 0.21. Through the operation, the surface precoating oil function of the metal lithium belt can be completed, the surface of the metal lithium belt reaches a grinding and polishing state after being coated with oil, and the phenomenon of sticking to rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Example 9
The difference from example 2 is that a sponge having a density of 18kg/m is used 3 The pressure between the oil reservoir 1 and the backup roller 3 is adjusted to 40N, and the pressure f between the backup roller 3 is required 1 The fluctuation is within +/-3N, at the moment, the roughness Ra of the surface of the polished lithium belt is 0.30, the function of precoating the surface of the metal lithium belt with oil can be finished through the operation, the surface of the metal lithium belt reaches the polished state after being coated with oil, and the phenomenon of sticking rollers is avoided after the subsequent lithium belt enters the calendering slurry coating.
Comparative example 1
The lithium belt of example 2 was used as the comparative example, lubricating oil was adhered to the surface of the oiling roller as disclosed in chinese patent document CN218190626U, the lithium belt was simultaneously pressed down to contact the oiling roller by the pressing assembly, and the oil on the oiling roller was transferred to the lithium belt to achieve the oil precoating function, and the oil coating amount and oil type were exactly the same as those of example 2. After 15min of operation, the phenomenon that the metallic lithium adheres to the oiling roller can occur, so that the oiling is uneven. And conveying the metal lithium belt with the pre-oiled operation into a calendaring slurry coating system, wherein the phenomenon that the metal lithium adheres to a coating roller after the operation is performed for 25 minutes.
Further, it should be noted that the coating roller and the oiling roller in the conventional calendaring mechanism and the oiling mechanism cannot be replaced at will, and in this comparative example 1, when the conventional 626U oiling roller is used for pre-oiling, the pre-oiling roller generates the phenomenon of sticking lithium in a shorter time, which greatly affects the stability and the continuity of the subsequent lithium calendaring.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A process for lithium calendaring a pre-oil, comprising: the lithium belt roughness Ra is controlled to be not higher than 0.5 and an oiling operation is performed.
2. The process according to claim 1, wherein the flexible substrate with liquid absorbing property is used for acting on the surface of the lithium belt to realize oiling operation, and the pressure of the flexible substrate acting on the surface of the lithium belt is adjusted to polish the lithium belt so as to control the roughness Ra of the lithium belt; preferably, the lithium belt roughness Ra is 0.025 to 0.5.
3. The process of claim 2, wherein the flexible substrate is a high resilience material; preferably, the high resilience material is a sponge; more preferably, the density of the sponge is 18-45 kg/m 3 。
4. A process according to claim 2 or 3, wherein the pressure of the flexible substrate against the surface of the lithium strip is between 5 and 255N.
5. The process of any one of claims 2-4, wherein the pressure is determined using the following equation one: f (f) 1 ＝3.5×(5×tan 3 θ×l 1 ×d 1 2 +3.8), where f 1 Pressure is given in N; θ is the included angle between the running direction of the lithium band and the horizontal line; l (L) 1 The lithium band is provided with a unit of m; d, d 1 The lithium band thickness is given in mm.
6. The process of any one of claims 1-5, wherein the oil employed in the oiling operation is one or more of lubricating oil, white mineral oil, paraffinic oil, heat transfer oil, engine oil, silicone oil, rust preventive oil, hydraulic oil, cutting fluid.
7. A lithium rolling pre-oiling device, comprising:
the oil storage tank is provided with an oil outlet;
a flexible substrate disposed on the outlet and having liquid-absorbing properties;
the support roller is arranged at a position adjacent to the oil outlet and forms a lithium belt channel with the flexible substrate;
and the adjusting mechanism is arranged on the oil storage tank and is used for adjusting the pressure of the flexible substrate acting on the lithium belt.
8. The device according to claim 7, wherein a baffle plate for adjusting the width of the oil outlet is further arranged in the oil storage tank; preferably, the width of the oil outlet is 0.1-10 mm.
9. The device of claim 7, wherein the flexible substrate is a high resilience material; preferably, the high resilience material is a sponge; more preferably, the density of the sponge is 18-45 kg/m 3 。
10. The apparatus of any one of claims 7-9, further comprising a roller that adjusts the direction of travel of the lithium strip to a vertical direction.
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| CN104160536A (en) * | 2012-02-28 | 2014-11-19 | 株式会社Uacj | Aluminum foil for collectors and method for producing same |
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| CN112310338A (en) * | 2020-11-04 | 2021-02-02 | 远景动力技术(江苏)有限公司 | Pole piece calendering system and pole piece calendering process |
| CN214603663U (en) * | 2020-10-27 | 2021-11-05 | 湖南立方新能源科技有限责任公司 | Surface treatment device for metal lithium strip |
| CN114335432A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Metal lithium belt, negative plate and battery |
| CN114864875A (en) * | 2022-06-01 | 2022-08-05 | 深圳市强瑞精密技术股份有限公司 | Pole piece lithium supplement all-in-one machine and lithium supplement method thereof |
| CN218190626U (en) * | 2022-07-28 | 2023-01-03 | 广东利元亨智能装备股份有限公司 | Lithium piece oiling station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104160536A (en) * | 2012-02-28 | 2014-11-19 | 株式会社Uacj | Aluminum foil for collectors and method for producing same |
| CN206878096U (en) * | 2017-07-12 | 2018-01-12 | 宁德时代新能源科技股份有限公司 | Calender device |
| CN214603663U (en) * | 2020-10-27 | 2021-11-05 | 湖南立方新能源科技有限责任公司 | Surface treatment device for metal lithium strip |
| CN112310338A (en) * | 2020-11-04 | 2021-02-02 | 远景动力技术(江苏)有限公司 | Pole piece calendering system and pole piece calendering process |
| CN114335432A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Metal lithium belt, negative plate and battery |
| CN114864875A (en) * | 2022-06-01 | 2022-08-05 | 深圳市强瑞精密技术股份有限公司 | Pole piece lithium supplement all-in-one machine and lithium supplement method thereof |
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| CN116371701B (en) | 2024-03-22 |
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