CN219998263U - Coating integrated negative plate strip-shaped interval prelithiation device - Google Patents
Coating integrated negative plate strip-shaped interval prelithiation device Download PDFInfo
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- CN219998263U CN219998263U CN202321366987.XU CN202321366987U CN219998263U CN 219998263 U CN219998263 U CN 219998263U CN 202321366987 U CN202321366987 U CN 202321366987U CN 219998263 U CN219998263 U CN 219998263U
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- 239000011248 coating agent Substances 0.000 title claims abstract description 85
- 238000000576 coating method Methods 0.000 title claims abstract description 85
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 184
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 176
- 230000007246 mechanism Effects 0.000 claims abstract description 85
- 239000007888 film coating Substances 0.000 claims abstract description 42
- 238000009501 film coating Methods 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 38
- 238000010030 laminating Methods 0.000 claims description 51
- 238000004804 winding Methods 0.000 claims description 42
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 23
- 238000006138 lithiation reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 abstract description 6
- 238000003475 lamination Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 22
- 239000007788 liquid Substances 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a coating integrated anode strip-shaped interval prelithiation device, which comprises: the base film unreeling mechanism and the base film reeling mechanism are respectively used for unreeling and reeling the base film; a coating assembly for producing a first lithium film and a second lithium film; the first pole piece unreeling mechanism, the second pole piece unreeling mechanism, the first pole piece reeling mechanism and the second pole piece reeling mechanism are respectively used for unreeling and reeling the first pole piece and the second pole piece; the first film coating device is used for transferring and coating the metal lithium layers on the first lithium film and the second lithium film on the first pole piece at intervals in a strip mode, and the second film coating device is used for transferring and coating the residual metal lithium layers on the first lithium film and the second lithium film on the second pole piece. According to the utility model, the lithium supplementing amount can be accurately controlled by strip-shaped interval-type lamination of the coated lithium film on the negative plate, so that the problem of excessive metal lithium is avoided.
Description
Technical Field
The utility model relates to the technical field of battery manufacturing, in particular to a coating integrated anode strip-shaped interval pre-lithiation device.
Background
Lithium ion batteries are one of the most widely used secondary batteries because of their high specific energy, small size, and long cycle life. With the continuous development of high-power and high-energy equipment such as electronic equipment and electric vehicles, the energy density requirement on lithium ion batteries is higher and higher. In the first charge and discharge process of the lithium ion battery, a layer of solid electrolyte interface film (Solid electrolyte interface), abbreviated as SEI film, is formed to cover the surface of the electrode material. Wherein the generation of the SEI film consumes a part of lithium ions from the positive electrode, thereby causing the reduction of the energy density of the lithium ion battery irreversibly in the first charge and discharge process. To improve this problem, a metal lithium film is usually laminated on the negative electrode sheet in advance to increase the energy density of the lithium ion battery.
At present, the thinnest metal lithium film usually produced has about 5 μm due to the technical problem, and the metal lithium is excessive when the film is directly applied to a battery for lithium supplementation. The patent application document with the patent number of CN114709374A discloses a lithium supplementing device and a lithium supplementing method for an integrated negative plate, oil coating operation is carried out when the lithium strip is rolled, and the coated oil is finally inevitably introduced into a lithium ion battery, so that the battery performance is inevitably influenced; on the other hand, when the pole piece is covered with the lithium belt, the two sides of the pole piece are covered and combined in a divided way, so that the pole piece is calendered for 2 times, and the possibility of wrinkling of the pole lug and damage of copper foil in the pole piece is increased.
In view of the above, the utility model provides a coating integrated anode strip-shaped interval prelithiation device, which avoids the problem of excessive metal lithium by strip-shaped interval-type lamination of a lithium film formed after coating on an anode strip. In addition, through the control to the lithium film base film, the metal lithium is very easy to peel off from the base film, and then is transferred and covered on the pole piece, so that the condition of pole piece covering omission is avoided, and the product qualification rate is greatly increased.
Disclosure of Invention
The utility model provides a device and a method for pre-lithiation of a strip-shaped interval of a cathode plate, which are integrally coated, by the method and the device, liquid metal lithium can be coated on a base film to form a micron-sized ultrathin lithium film, the strip-shaped interval of the ultrathin lithium film is transferred to two rolls of battery pole plates, and a plurality of micron-sized lithium strips with strip-shaped intervals are formed on each pole plate, so that the total amount of lithium supplement to the cathode plate can be controlled more accurately. The method and the device can realize batch, continuous and roll-to-roll production, and play a decisive role in accurately controlling the lithium supplementing amount in the pre-lithium chemical industry in the lithium battery industry.
The utility model aims to provide a strip-shaped interval pre-lithiation device and method for a negative plate integrated with coating, which are used for accurately controlling the lithium supplementing amount of a pre-lithiation process and improving the production efficiency by rolling an ultrathin metal lithium film formed after coating twice and respectively transferring strip-shaped intervals to two rolls of pole pieces to be pre-lithiated.
The aim of the utility model can be achieved by the following technical scheme.
The utility model provides a coating integrated anode strip-shaped interval prelithiation device, which comprises:
the base film unreeling mechanism comprises a first base film unreeling mechanism and a second base film unreeling mechanism which are respectively used for unreeling the first base film and the second base film; the coating mechanism comprises a first coating mechanism and a second coating mechanism, and is used for coating liquid metal lithium on the first base film and the second base film respectively to form a first lithium film and a second lithium film; the first pole piece unreeling mechanism is used for unreeling the first pole piece; the first film laminating device is used for simultaneously transferring and laminating the metal lithium layers on the first lithium film and the second lithium film on the first pole piece at intervals to obtain a first pre-lithiated pole piece, wherein the metal lithium layer on the first lithium film and the metal lithium layer on the second lithium film are respectively transferred and laminated on the upper surface and the lower surface of the first pole piece; the first pole piece winding mechanism is used for winding the first pre-lithiated pole piece after pre-lithiation; the second pole piece unreeling mechanism is used for unreeling the second pole piece; the second film coating device is used for transferring and coating the residual metal lithium layers on the first lithium film and the second lithium film onto the second pole piece to obtain a second pre-lithiated pole piece, wherein the residual metal lithium layers on the first lithium film and the residual metal lithium layers on the second lithium film are respectively transferred and coated onto the upper surface and the lower surface of the second pole piece; the second pole piece winding mechanism is used for winding the second pre-lithiated pole piece; and the base film winding mechanism comprises a first base film winding mechanism and a second base film winding mechanism which are respectively used for winding the first base film and the second base film after the use is completed.
Optionally, the coating mechanism includes a coating head and a backing roll.
Optionally, the back roller has a cooling function.
Optionally, the first film laminating device comprises a first film laminating roller and a second film laminating roller; wherein the working area of at least one of the first laminating roller and the second laminating roller has a strip-shaped interval.
Alternatively, the stripe-shaped intervals are uniformly distributed concave-convex intervals with well-defined dividing lines, and the size of the concave-convex intervals is 1mm-10mm.
Alternatively, only one of the first and second film-coating rolls has a concavo-convex-like interval, and the width dimensions of the concave and convex portions thereof are 1mm to 10mm, preferably 3 to 5mm.
Optionally, the first film coating roller and the second film coating roller have concave-convex intervals, and the corresponding relationship of the two concave-convex intervals is convex-to-convex and concave-to-concave.
Alternatively, the concave section shape of the laminating roller having the strip-shaped intervals is rectangular.
Alternatively, the concave section of the laminating roller with strip-shaped intervals is semicircular or a groove shape with an arc-shaped bottom.
Optionally, at least one of a supporting roller mechanism, a tension detecting mechanism and a tension controlling mechanism is arranged between the coating device and the first film covering device.
Optionally, at least one of a peeling mechanism, a support roller mechanism, a tension detecting mechanism and a tension controlling mechanism is arranged at the downstream of the first film laminating device and/or the second film laminating device.
Optionally, the first and second base films have a coating disposed on their surfaces.
Optionally, the base film comprises polyethylene terephthalate (PET), biaxially oriented polypropylene film (BOPP), polyimide (PI), polytetrafluoroethylene (PTFE).
Optionally, the coating material comprises silicone oil, fluoride, mineral oil.
Optionally, the base film is plasma treated or corona treated prior to application of the coating material; after coating, a heating and/or curing treatment is carried out. So that the coating material and the base film are firmly bonded, and the coating material is prevented from being separated.
Optionally, the apparatus further comprises a gas source and a gas control valve connected to the liquid metal lithium delivery conduit upstream of the coating head for mixing gas into the liquid metal lithium.
The technical scheme of the utility model has at least one of the following advantages:
1. the coating mechanism keeps the high-temperature state of liquid lithium metal, reduces the tension of the lithium metal, and enables the lithium film formed after coating to be more uniform in thickness compared with the lithium film produced by the conventional rolling scheme.
2. The coating mechanism presses the ultrathin lithium film formed after coating onto the negative plate in a strip-shaped interval mode, so that the problem of excessive metal lithium is avoided.
3. Through the control of the coating on the lithium film base film, the metal lithium is very easy to peel off from the base film and then transfer and cover the pole piece, thereby avoiding the condition of pole piece covering leakage and greatly increasing the product qualification rate.
4. The liquid lithium metal is directly coated on the base film to form an ultrathin lithium film, and then the ultrathin lithium film is transferred and covered on the two pole pieces at intervals in a multi-time strip mode, so that the automation degree is high, no lithium metal is wasted, the production cost is low, and the efficiency is high;
5. the technical scheme of the utility model has simple and easy structure, and can be rapidly produced in batches by adopting a roll-to-roll scheme.
Drawings
FIG. 1 is a schematic representation of one embodiment of the present utility model.
Fig. 2 is a specific embodiment in which the concave section shape of the laminating roller having the strip-shaped intervals is rectangular.
Fig. 3 is a specific embodiment of a concave section of a laminating roller having a bar-shaped interval in a circular arc shape.
Reference numerals illustrate:
a 10-frame; 11 lithium source; 12 a first feed pump; 13 a first lithium liquid control valve; a second feed pump 14; 15 a second lithium liquid control valve; 16 air sources; 17 a first gas control valve; a second gas control valve 18; 19 a first coating line; a second coating line 20; 21 a first coating head; 22 a second coating head; 23 a first backing roll; 24 a second backing roll; 25 a first base film unreeling mechanism; 251 first base film unwind reel; a second base film unreeling mechanism; 261 a second base film unwind reel; 27 a first pole piece unreeling mechanism; 271 first pole piece unreeling shaft; 28 a first pole piece winding mechanism; 281 first pole piece take-up reel; 29 a second pole piece unreeling mechanism; 291 second pole piece unreeling shaft; 30 a second pole piece winding mechanism; 301 a second pole piece take-up reel; 31 a first base film winding mechanism; 311 a first base film take-up spool; 32 a second base film winding mechanism; 321 a second base film take-up spool; 33 a first film coating device; 331 a first film laminating roller; 332 a second laminating roller; 333 recess; 334; 34 a second film coating device; 341 a third laminating roller; 342 fourth laminating roller; m10 first base film; m20 second base film; m11 first lithium film; m21 a second lithium film; m12 first strip-shaped interval lithium film; m22 second strip-shaped interval lithium film; p1 is a first pole piece; p11 is a first prelithiation pole piece; a P2 second pole piece; p21 second prelithiation pole piece.
Detailed Description
The following describes specific embodiments of the present utility model. It is to be understood that other various embodiments can be devised and modifications to the embodiments by those skilled in the art based on the teachings of this disclosure without departing from the scope or spirit of this utility model. The following detailed description is, therefore, not to be taken in a limiting sense.
In the description of the present utility model, it should be understood that the terms "first," "second," "upper," "lower," and the like are merely for convenience in describing the present utility model and to simplify the description, and thus should not be construed as limiting the present utility model.
One specific embodiment of the coated integrated negative electrode strip-shaped interval prelithiation device is described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, in the present embodiment, a coated integrated anode strip-shaped interval prelithiation device includes:
a frame 10; a lithium source 11; a gas source 16;
a first lithium film coating forming apparatus comprising: a first feed pump 12, a first lithium liquid control valve 13, a first gas control valve 17, a first coating pipe 19, a first coating head 21, a first back roller 23 and a first base film unreeling mechanism 25; the first base film unreeling mechanism 25 further comprises a first base film unreeling shaft 251, wherein the first base film M10 is mounted on the first base film unreeling shaft 251, and the first base film unreeling mechanism 25 unreels the first base film and bypasses the first back roller 23; the first feed pump 12 is used for pumping liquid metal lithium in the lithium source 11 into the first coating head 21 through the first coating pipeline 19 so as to coat the first base film M10; since the first base film M10 is closely attached to the first back roller 23, the first back roller 23 can rapidly cool the liquid lithium metal coated on the first base film M10 to form an ultra-thin lithium metal layer, thereby forming the first lithium film M11. Optionally, inert gas is mixed into the liquid metal lithium pumped into the first coating pipeline 19, the gas is provided by the gas source 16, and the content of the mixed gas in the liquid metal lithium can be adjusted by controlling the first feed pump 12, the first lithium liquid control valve 13 and the first gas control valve 17, so that the first lithium film M11 formed after coating has discontinuous micropores, and the lithium carrying amount in unit area is further reduced.
A second lithium film coating forming apparatus comprising: a second feed pump 14, a second lithium liquid control valve 15, a second gas control valve 18, a second coating pipe 20, a second coating head 22, a second backing roll 24, and a second base film unreeling mechanism 26; the second base film unreeling mechanism 26 further comprises a second base film unreeling shaft 261, wherein the second base film M20 is mounted on the second base film unreeling shaft 261, and the second base film unreeling mechanism 26 is unreeled and then bypasses the second back roller 24; the second feed pump 14 is used for pumping liquid metal lithium in the lithium source 11 into the second coating head 22 through the second coating pipeline 20 so as to coat the second base film M20; since the second base film M20 is closely attached to the second back roller 24, the second back roller 24 can rapidly cool the liquid lithium metal coated on the second base film M20 to form an ultra-thin lithium metal layer, thereby forming the second lithium film M21. Optionally, inert gas is mixed into the liquid metal lithium pumped into the second coating pipeline 20, the gas is provided by the gas source 16, and the content of the mixed gas in the liquid metal lithium can be adjusted by controlling the second feed pump 14, the second lithium liquid control valve 15 and the second gas control valve 18, so that a second lithium film M21 formed after coating has discontinuous micropores, and the lithium loading amount in unit area is further reduced.
A first pole piece unreeling mechanism 27 and a first pole piece reeling mechanism 28, wherein the first pole piece unreeling mechanism 27 comprises a first pole piece unreeling shaft 271 for unreeling the first pole piece P1; the first pole piece winding mechanism 28 includes a first pole piece winding shaft 281 for winding the first pre-lithiated pole piece P11 formed after the pre-lithiation of the first pole piece P1.
A second pole piece unreeling mechanism 29 and a second pole piece reeling mechanism 30, the second pole piece unreeling mechanism 29 comprising a second pole piece unreeling shaft 291 for unreeling the second pole piece P2; the second pole piece winding mechanism 30 includes a second pole piece winding shaft 301 for winding the second pre-lithiated pole piece P21 formed after the pre-lithiation of the second pole piece P2.
The first base film winding mechanism 31, wherein the first base film winding mechanism 31 comprises a first base film winding shaft 311 for winding the first base film M10.
The second base film winding mechanism 32, the second base film winding mechanism 32 includes a second base film winding shaft 321 for winding the second base film M20.
The first film laminating device 33 includes a first film laminating roller 331 and a second film laminating roller 332 that are disposed opposite to each other, and at least one of the first film laminating roller 331 and the second film laminating roller 332 has a stripe-shaped interval of uneven shape on a working surface thereof, that is, a plurality of concave portions 333 and convex portions 334 are arrayed in an axial direction.
The second film coating device 34, the second film coating device 34 includes a third film coating roller 341 and a fourth film coating roller 342 that are disposed opposite to each other, and the third film coating roller 341 and the fourth film coating roller 342 are both conventional cylindrical roller surfaces, i.e., the roller surfaces have no uneven strip-shaped intervals.
In the present embodiment, it is preferable that only one of the first laminating roller 331 and the second laminating roller 332 in the first laminating apparatus 33 has a concave-convex strip-shaped interval on the work surface thereof, and the other laminating roller is a conventional cylindrical roller surface (for example, the first laminating roller 331 is a roller having a concave-convex strip-shaped interval, and the second laminating roller 332 is a roller having a conventional cylindrical roller surface). The cross-sectional shape of the concave portion of the first film laminating roller 331 is preferably rectangular (as shown in fig. 2) or circular arc (as shown in fig. 3), the width dimension of the concave portion is 1-10mm, the depth is not limited (may be 0.1-10 mm), the width dimension of the convex portion is 1-10mm, and the width of the concave portion is preferably the same as the width of the convex portion (e.g., the width of the concave portion is 5mm, the width of the convex portion is 5 mm).
The specific working principle and flow of the coating integrated anode strip-shaped interval prelithiation device are as follows:
mounting the first base film M10 onto the first base film unreeling shaft 251 in the first base film unreeling mechanism 25, so that the first base film M10 bypasses the first back roller 23; the first back roller 23 has a cooling function, and the temperature of the first back roller 23 is controlled to be-50 ℃ to 20 ℃, preferably-30 ℃ to-10 ℃. Controlling the temperature of the liquid metal lithium in the lithium source 11 to be greater than 180 ℃, preferably 200 ℃ to 260 ℃; the gas in the gas source 16 is inert gas, preferably argon, and the output pressure is controlled to be less than 2MPa, preferably 0.2MPa to 0.5MPa. Adjusting the first lithium liquid control valve 13, starting the first feed pump 12 to pump liquid metal lithium in the lithium source 11 into the first coating head 21 through the first coating pipeline 19; the liquid metal lithium in the first coating head 21 is forced to be extrusion coated onto the first base film M10 from the inside of the slit by the pressure of the first feed pump 12, and the liquid metal lithium on the first base film M10 is instantaneously solidified onto the first base film M10 due to the extremely low temperature of the first back roller 23, forming the first lithium film M11. The thickness of the metal lithium layer on the first lithium film M11 can be controlled to be 3 μm to 20 μm by adjusting the size of the slit of the first coating head 21 and the feeding speed of the first base film M10. After stable coating, the first gas control valve 17 is opened and regulated, so that a certain amount of argon gas can be mixed into the liquid metal in the first coating pipeline 19, a plurality of micropores without a lithium layer attached are formed on the first lithium film M11 produced by coating, and the maximum size of the micropores can be smaller than 1mm by controlling the pressure and the flow rate of the argon gas.
Mounting the second base film M20 onto a second base film unreeling shaft 261 in a second base film unreeling mechanism 26, so that the second base film M20 bypasses the second back roller 24; the second back roller 24 has a cooling function, and the temperature of the second back roller 24 is controlled to be-50 ℃ to 20 ℃, preferably-30 ℃ to-10 ℃. Adjusting the second lithium liquid control valve 15, and starting the second feed pump 14 to pump the liquid metal lithium in the lithium source 11 into the second coating head 22 through the second coating pipeline 20; the liquid metal lithium in the second coating head 22 is forced to be extrusion coated onto the second base film M20 from the inside of the slit by the pressure of the second feed pump 14, and the liquid metal lithium on the second base film M20 is instantaneously solidified onto the second base film M20 due to the extremely low temperature of the second back roller 24, forming the second lithium film M21. The thickness of the metal lithium layer on the second lithium film M21 can be controlled to be 3 μm to 20 μm by adjusting the size of the slit of the second coating head 22 and the feeding speed of the second base film M20. After stable coating, the second gas control valve 18 is opened and regulated to mix a certain amount of argon into the liquid metal in the second coating pipe 20, so that a plurality of micropores without a lithium layer attached are formed on the second lithium film M21 produced by coating, and the maximum size of the micropores can be made smaller than 1mm by controlling the pressure and the flow rate of the argon.
The first laminating roller 331 in the first laminating apparatus 33 is a roller having a concave-convex-like stripe-shaped interval, and the second laminating roller 332 is provided as a conventional cylindrical roller.
The first pole piece P1 is mounted on a first pole piece unreeling shaft 271, and is unreeled by the first pole piece unreeling mechanism 27 and enters the middle of a first laminating roller 331 and a second laminating roller 332 of the first laminating device 33; the first lithium film M11 formed after coating passes through the first film coating device 33 between the second film coating roller 332 and the first pole piece P1, and one surface of the first lithium film M11 with the ultrathin metal lithium layer is opposite to the first pole piece P1, and one surface of the first base film M10 on the first lithium film M11 is opposite to the second film coating roller 332. The second lithium film M21 formed after coating passes through the first film coating device 33 between the first film coating 331 and the first pole piece P1, and one surface of the second lithium film M21 with the ultrathin metal lithium layer is opposite to the first pole piece P1, and one surface of the second base film M20 on the second lithium film M21 is opposite to the first film coating roller 331. Since the first film coating roller 331 in the first film coating device 33 is a roller with concave-convex strip-shaped intervals, the portion corresponding to the convex portion 334 on the first film coating roller 331 is rolled, so that the ultrathin lithium layer at the corresponding portion on the first lithium film M11 and the second lithium film M21 is transferred and coated on the first pole piece P1, and the first pre-lithiated pole piece P11 is formed; while the portions of the first laminating roller 331 corresponding to the recesses 333 are not rolled, the ultrathin lithium layers of the corresponding portions of the first and second lithium films M11 and M21 remain on the first and second base films M10 and M20, and the first and second strip-shaped spacer lithium films M12 and M22 are formed, respectively. The first pre-lithiated pole piece P11 formed after being rolled by the first film coating device 33 is wound on the first pole piece winding shaft 281 and wound by the first pole piece winding mechanism 28.
The second pole piece P2 is mounted on the second pole piece unreeling shaft 291, and is unreeled by the second pole piece unreeling mechanism 29 and enters the middle of the third film coating roller 341 and the fourth film coating roller 342 of the second film coating device 34; the first strip-shaped interval lithium film M12 formed after being rolled by the first film coating device 33 passes through the second film coating device 34 between the fourth film coating roller 342 and the second electrode P2, and one surface of the first strip-shaped interval lithium film M12 with the strip-shaped ultrathin metal lithium layer is opposite to the second electrode P2, and one surface of the first base film M10 on the first strip-shaped interval lithium film M12 is opposite to the fourth film coating roller 342. The second strip-shaped interval lithium film M22 formed after being rolled by the first film coating device 33 passes through the second film coating device 34 between the third film coating roller 341 and the second electrode sheet P2, and one surface of the second strip-shaped interval lithium film M22 with the strip-shaped ultrathin metal lithium layer is opposite to the second electrode sheet P2, and one surface of the second base film M20 on the second strip-shaped interval lithium film M22 is opposite to the third film coating roller 341. Since the third film laminating roller 341 and the fourth film laminating roller 342 in the second film laminating device 34 are conventional cylindrical rollers, the first strip-shaped interval lithium film M12, the second pole piece P2 and the second strip-shaped interval lithium film M22 are rolled, so that the strip-shaped interval ultrathin metal lithium layers on the first strip-shaped interval lithium film M12 and the second strip-shaped interval lithium film M22 are transferred and laminated onto the second pole piece P2, and the second pre-lithiated pole piece P21 is formed. After rolling, the metallic lithium on the first strip-shaped interval lithium film M12 is transferred, and only the first base film M10 is remained; the metallic lithium layer on the second strip-shaped interval lithium film M22 is transferred, and only the second base film M20 remains. The second pre-lithiated pole piece P21 is wound on a second pole piece winding shaft 301 and is wound by a second pole piece winding mechanism 30; the first base film M10 and the second base film M20 after the film coating are completed are wound onto the first base film winding shaft 311 and the second base film winding shaft 321, respectively, and are wound by the first base film winding mechanism 31 and the second base film winding mechanism 32.
In the utility model, the ultrathin lithium film (the first lithium film M11 and the second lithium film M21) is directly formed by coating liquid metal lithium, then the strip-shaped interval is transferred to two negative pole pieces (the first pole piece P1 and the second pole piece P2) after rolling by a first laminating device 33 and a second laminating device 34 which are specially arranged, the width of the ultrathin metal lithium layer on the pre-lithiated pole piece (the first pre-lithiated pole piece P11 and the second pre-lithiated pole piece P21) can be determined by predefining the width of the concave-convex strip-shaped interval on a laminating roller in the first laminating device 33, for example, the interval of the ultrathin metal lithium layer on the pre-lithiated pole piece is expected to be 3mm, and the width of the concave part and the convex part in the first laminating device 33 is only required to be designed to be 3 mm. That is, the spacing distance of the ultra-thin lithium layers on the pre-lithiated pole piece can be controlled. On the other hand, assuming that the theoretical lithium supplementing amount requires a thickness of 3 μm, only an ultrathin lithium layer needs to be coated on 6 μm in the present utility model, and then strip-shaped intervals are transferred to the first and second pole pieces P1 and P2, with the lithium carrying amount being the same as the theoretical metal lithium content of 3 μm thickness. The method has the advantages that the difficulty of coating the metal lithium (the difficulty of coating the metal lithium with the thickness of 3 mu m is far greater than that of coating the metal lithium with the thickness of 6 mu m) is greatly reduced, the production efficiency is greatly improved (under the condition that the coating speed is the same, the yield of coating the metal lithium with the thickness of 6 mu m is 2 times that of coating the metal lithium with the thickness of 3 mu m, and in fact, the production efficiency is improved by far greater than 2 times due to the reduction of the difficulty).
Although the present utility model has been disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (10)
1. A coated integrated negative strip-shaped interval prelithiation device, characterized in that the device comprises:
the base film unreeling mechanism comprises a first base film unreeling mechanism and a second base film unreeling mechanism which are respectively used for unreeling the first base film and the second base film;
the coating mechanism comprises a first coating mechanism and a second coating mechanism, and is used for coating liquid metal lithium on the first base film and the second base film respectively to form a first lithium film and a second lithium film;
the first pole piece unreeling mechanism is used for unreeling the first pole piece;
the first film laminating device is used for simultaneously transferring and laminating the metal lithium layers on the first lithium film and the second lithium film on the first pole piece at intervals to obtain a first pre-lithiated pole piece, wherein the metal lithium layer on the first lithium film and the metal lithium layer on the second lithium film are respectively transferred and laminated on the upper surface and the lower surface of the first pole piece;
the first pole piece winding mechanism is used for winding the first pre-lithiated pole piece after pre-lithiation;
the second pole piece unreeling mechanism is used for unreeling the second pole piece;
the second film coating device is used for simultaneously transferring and coating the residual metal lithium layers on the first lithium film and the second lithium film onto the second pole piece to obtain a second pre-lithiated pole piece, wherein the residual metal lithium layers on the first lithium film and the residual metal lithium layers on the second lithium film are respectively transferred and coated onto the upper surface and the lower surface of the second pole piece;
the second pole piece winding mechanism is used for winding the second pre-lithiated pole piece; and
the base film winding mechanism comprises a first base film winding mechanism and a second base film winding mechanism which are respectively used for winding the first base film and the second base film after the use is completed.
2. The coated integral negative strip gap prelithiation device of claim 1, wherein the coating mechanism comprises a coating head and a backing roll.
3. The coated integrated negative strip gap prelithiation device of claim 2, wherein the backing roll has a cooling function.
4. The coated integral negative strip gap prelithiation device of claim 1, wherein the first laminating means comprises a first laminating roller and a second laminating roller, wherein a working area of at least one of the first laminating roller and the second laminating roller has a strip gap.
5. The coated integrated negative electrode strip gap prelithiation device of claim 4, wherein the strip gaps are uniformly distributed, concave-convex gaps with well defined demarcation lines, the concave-convex gaps being 1mm-10mm in size.
6. The coating-integrated anode strip gap prelithiation device of claim 4, wherein when the first and second coating rolls have strip gaps, the strip gaps of the two coating rolls correspond to a convex-to-convex and a concave-to-concave.
7. The coating-integrated anode strip-shaped interval prelithiation device according to claim 1, wherein at least one of a supporting roller mechanism, a tension detecting mechanism and a tension control mechanism is further arranged between the coating mechanism and the first film coating device.
8. The coated integrated negative electrode strip-shaped interval prelithiation device of claim 1, wherein at least one of a peeling mechanism, a support roller mechanism, a tension detection mechanism, and a tension control mechanism is further provided downstream of the first film coating device and/or the second film coating device.
9. The coated integral negative strip gap prelithiation device of claim 1, wherein the first and second base films have a coating disposed on their surfaces.
10. The coated integrated negative strip gap prelithiation device of claim 2, further comprising a gas source and a gas control valve connected to the liquid metal lithium delivery conduit upstream of the coating head for mixing gas into the liquid metal lithium.
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| CN202321366987.XU CN219998263U (en) | 2023-05-31 | 2023-05-31 | Coating integrated negative plate strip-shaped interval prelithiation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119181773A (en) * | 2024-11-26 | 2024-12-24 | 西北工业大学 | Accurate pre-lithiated ultrathin high-capacity negative electrode with controllable lithium layer thickness and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119181773A (en) * | 2024-11-26 | 2024-12-24 | 西北工业大学 | Accurate pre-lithiated ultrathin high-capacity negative electrode with controllable lithium layer thickness and preparation method thereof |
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