CN113964295A - Lithium supplementing device and method for lithium ion battery negative pole piece - Google Patents
Lithium supplementing device and method for lithium ion battery negative pole piece Download PDFInfo
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
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Abstract
The invention provides a lithium supplementing device and a lithium supplementing method for a lithium ion battery negative pole piece. The lithium transfer unit coats molten lithium liquid on the surface of the lithium conveying device, the lithium cooling unit cools the molten lithium liquid on the surface of the lithium conveying device to form a lithium layer, the lithium calendaring unit laminates the lithium to a negative electrode plate, and the lithium recovery unit recovers the lithium layer remaining on the surface of the lithium conveying device. The lithium supplementing device and the lithium supplementing method for the negative pole piece of the lithium ion battery can realize lamination lithium supplementing after the negative pole piece is cut into pieces on the basis of good lithium supplementing uniformity, and can realize melting recycling of residual lithium.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium supplementing device and a lithium supplementing method for a negative pole piece of a lithium ion battery.
Background
With the wide application of lithium ion batteries, the energy density of products such as high-endurance journey power automobiles, unmanned planes, high-power 3C and the like is higher and higher. Although the gram capacity of the pure Si material is more than 3000mAh/g, the pure Si material has the defects of large expansion, serious pulverization and the like which are difficult to overcome; SiO 2xThe material has gram capacity of more than 1500mAh/g, better expansion resistance and pulverization resistance, obviously improved cycle performance compared with pure Si, but obviously improved cycle performance compared with pure Si material, SiOxThe first efficiency of the material is low (30% lower). The general solution is prelithiation, where prelithiation directly on the negative pole piece is the most effective way to supplement lithium.
The method for pre-lithiating the pole piece mainly comprises a lithium powder lithium supplement method and a lithium rolling method. Wherein, the lithium powder has high activity in the lithium powder lithium supplementing method, is not easy to prepare and process, and needs Li on the surface2And O protection, which is difficult to effectively embed into active materials in the pole piece, leads to a large amount of lithium powder residues. The lithium calendering method presses the film lithium to the surface of the pole piece, has the advantages of easiness in processing, controllable film thickness and the like, but has poor lithium supplementing uniformity, complex transfer process, difficulty in large-scale industrialization, incomplete transfer of the lithium sheet and serious waste. In addition, the lithium calendering method can only use continuous pole pieces, the scattered pole pieces (cut laminations) cannot be continuously used for lithium supplement, and residual lithium at the gap position cannot be recycled, so that a large amount of waste is caused. At present, the problem can be effectively alleviated by adopting molten lithium liquid to supplement lithium for the pole piece.
Although the problem of poor lithium supplementing uniformity can be solved by adopting molten lithium liquid to supplement lithium for the pole piece, residual lithium cannot be recovered, and discontinuous lithium supplementing for the cut piece cannot be realized. Therefore, how to realize the recovery of residual lithium and discontinuous lithium supplement in the cutting pieces on the basis of good lithium supplement uniformity becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lithium supplement device and a lithium supplement method for a negative pole piece of a lithium ion battery, which can realize lamination lithium supplement after the negative pole piece is cut into pieces on the basis of good lithium supplement uniformity and simultaneously melt and recycle residual lithium; in addition, the lithium supplementing process provided by the invention is simple to operate, safe and controllable, and is beneficial to industrial production.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a lithium supplementing device for a lithium ion battery negative electrode piece, which comprises a lithium transfer unit, a lithium cooling unit, a lithium rolling unit and a lithium recovery unit which are arranged along a material flowing direction, and a lithium conveying device sleeved on the peripheries of the lithium cooling unit, the lithium rolling unit and the lithium recovery unit, wherein the lithium supplementing device comprises a lithium transfer unit, a lithium cooling unit, a lithium rolling unit and a lithium recovery unit, and a lithium conveying device sleeved on the peripheries of the lithium cooling unit, the lithium rolling unit and the lithium recovery unit
The lithium transfer unit is configured to transfer molten lithium liquid to a surface of the lithium delivery device,
the lithium cooling unit is configured to cool the molten lithium liquid coated on the surface of the lithium delivery device to form a lithium layer,
the lithium calendering unit is configured to laminate the lithium onto a negative electrode sheet, and
the lithium recovery unit is configured to recover the lithium layer remaining on the surface of the lithium delivery device.
In the invention, the metal lithium is molten lithium liquid, and the molten lithium liquid has good fluidity and is uniformly coated, thereby ensuring the uniformity and consistency of lithium supplement. Meanwhile, the area of a lithium layer on the surface of the lithium conveying device can be larger than that of the negative pole piece, the negative pole piece does not need a whole pole piece, the lamination lithium supplement can be realized after the negative pole piece is cut into pieces, and the melting recycling of residual lithium is realized through the lithium recovery unit after the lamination lithium supplement, so that the waste of lithium is avoided. In addition, the lithium supplementing process provided by the invention is simple to operate, safe and controllable, and is beneficial to industrial production.
In a preferred embodiment of the present invention, the lithium transfer unit includes a melting tank and a transfer roller located in the melting tank, the melting tank is filled with the molten lithium solution, the transfer roller is in contact with the lithium delivery device, and the transfer roller is partially immersed in the molten lithium solution.
The lithium transfer unit is configured to transfer the molten lithium liquid to a surface of the lithium delivery device under rotation of the transfer roller.
Preferably, the transfer roller and the lithium delivery device rotate in the same direction.
In a preferred embodiment of the present invention, the transfer roller is a micro-concave roller or a concave roller.
Preferably, the material of the transfer roller is ceramic.
Preferably, the material of the transfer roller is metal, and the surface of the transfer roller is coated with a ceramic coating.
Preferably, the heating part is arranged inside the transfer roller, so that the molten lithium liquid can be prevented from solidifying on the surface of the transfer roller to influence the subsequent coating process.
As a preferred embodiment of the present invention, the lithium transfer unit includes a vapor deposition device. And the molten lithium liquid is coated on the surface of the lithium conveying device by adopting a vapor deposition method, so that the lithium supplementing uniformity is further improved.
It should be noted that the structure of the vapor deposition device is not specifically required or limited in the present invention, and the vapor deposition device is used to coat the molten lithium liquid on the surface of the lithium delivery device. It is therefore understood that a vapor deposition apparatus capable of coating molten lithium on the surface of the lithium delivery apparatus can be used in the present invention, and those skilled in the art can select different types of vapor deposition apparatuses according to the use scenario or can adapt the structure of the vapor deposition apparatus.
Illustratively, the present invention provides a conventional structure of a vapor deposition apparatus, comprising: a transfer chamber, a heating component, a spray head assembly, a brake component, a transfer component, and the like.
In a preferred embodiment of the present invention, the lithium transfer device is a conveyor belt.
Preferably, the material of the conveyor belt is any one of rubber, plastic or metal foil, and the surface of the conveyor belt is coated with a ceramic coating.
Preferably, the metal foil is a copper foil or an iron foil.
Preferably, the lithium cooling unit includes a low temperature roller.
As a preferable technical solution of the present invention, the lithium rolling unit includes a rolling roller and a negative electrode plate, a gap is left between the rolling roller and the negative electrode plate, and the lithium conveying device passes through the gap.
The lithium rolling unit is configured to laminate the lithium on the surface of the lithium conveying device to the negative electrode sheet by the rolling roller while the lithium conveying device is conveyed from the lithium cooling unit to the lithium rolling unit.
As a preferable technical solution of the present invention, the lithium recovery unit includes a high temperature roller and a recovery roller, a gap is left between the high temperature roller and the recovery roller, the lithium delivery device passes through the gap, and the rotation of the high temperature roller and the low temperature roller of the lithium cooling unit drives the lithium delivery device to rotate.
The lithium recovery unit is configured to transfer and recover the residual lithium layer on the surface of the lithium delivery device through the recovery roller after the residual lithium layer is melted by the high-temperature roller when the lithium delivery device is transferred from the lithium calendaring unit to the lithium recovery unit.
Preferably, the high temperature roller rotates in the opposite direction to the recovery roller.
The low-temperature roller, the calendering roller and the high-temperature roller are distributed in a triangular shape.
In the invention, the lithium supplementing device also comprises an inert atmosphere chamber or a vacuum chamber, the lithium supplementing devices are placed in the inert atmosphere chamber or the vacuum chamber, and the lithium supplementing process is carried out in the inert atmosphere chamber or the vacuum chamber. The inert atmosphere chamber is connected with the gas drying unit, and the gas drying unit is arranged outside the inert atmosphere chamber and used for providing dry inert gas for the inert atmosphere chamber. The whole lithium supplementing process adopts vacuum and inert gas protection, and is safe and controllable.
In a second aspect, the invention provides a lithium supplementing method for a negative electrode plate of a lithium ion battery, wherein the lithium supplementing method adopts the lithium supplementing device of the first aspect; the lithium supplementing method comprises the following steps:
coating the molten lithium liquid on the surface of the lithium delivery device by the lithium transfer unit;
passing the lithium delivery device through the lithium cooling unit so that the molten lithium liquid on the surface of the lithium delivery device is cooled by the lithium cooling unit to form a solid lithium layer;
passing the lithium conveying device through the lithium calendering unit so as to laminate the lithium to the surface of the negative pole piece through the lithium calendering unit to obtain a lithium-supplemented negative pole piece; and
passing the lithium delivery device through the lithium recovery unit to recover the remaining lithium layer on the surface of the lithium delivery device by the lithium recovery unit.
According to the invention, the molten lithium liquid on the surface of the lithium conveying device is firstly cooled to form the solid lithium layer, and then the solid lithium layer is laminated on the surface of the negative pole piece, so that not only can the binder in the active material layer of the negative pole piece be prevented from losing efficacy due to overhigh temperature of the molten lithium liquid be avoided, but also the phenomenon that the temperature is higher due to the reaction between the high-temperature molten lithium liquid and the active material can be avoided. In addition, the lithium conveying device can be recycled for a long time, and no waste is generated.
In the invention, the negative pole piece comprises a negative active material, a conductive agent and a binder; the active material is SiOxAny one or a combination of at least two of graphite, hard carbon and nano silicon.
As a preferred technical scheme of the invention, the method is carried out under vacuum or inert gas environment.
Preferably, the vacuum is at a vacuum level of ≦ -60MPa, such as-60 MPa, -62MPa, 64MPa, -66MPa, -68MPa, -70MPa, or-75 MPa, but not limited to the values recited, and other values not recited within the range are equally applicable.
Preferably, the inert gas comprises any one of helium, neon, argon, krypton or xenon or a combination of at least two thereof.
In a preferred embodiment of the present invention, the molten lithium is obtained by heating lithium metal to a temperature of 180 ℃ or higher, and may be, for example, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃ or 260 ℃, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Preferably, the temperature of the lithium cooling unit is < 180 ℃, such as 170 ℃, 160 ℃, 150 ℃, 140 ℃, 1300 ℃, 120 ℃, 110 ℃, 100 ℃ or 90 ℃, but is not limited to the recited values, and other values not recited within this range of values are equally applicable.
Preferably, the temperature of the lithium recovery unit is 180 ℃ or higher, such as 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃ or 260 ℃, but is not limited to the recited values, and other values not recited within this range of values are equally applicable.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the area of the lithium layer on the surface of the lithium conveying device in the lithium supplementing device provided by the invention can be larger than that of the negative pole piece, the negative pole piece does not need to be a whole pole piece, and the lamination lithium supplementing can be realized after the negative pole piece is cut into pieces. Meanwhile, after the lamination is subjected to lithium supplement, the residual lithium is melted and recycled through the lithium recycling unit, so that the waste of lithium is avoided.
(2) The lithium metal in the invention is molten lithium liquid, the molten lithium liquid has good fluidity and is uniformly coated, so that the uniformity and consistency of lithium supplement are ensured, and the lithium supplement process is simple to operate, safe and controllable, and is beneficial to industrial production.
(3) According to the invention, the conventional operation of directly coating the molten lithium liquid on the pole piece is broken through, the molten lithium liquid is cooled and then pressed to the surface of the pole piece, so that the binder in the active material layer of the negative pole piece is prevented from losing effectiveness due to overhigh temperature of the molten lithium liquid, the reaction between the high-temperature molten lithium liquid and the active material can be avoided, and the lithium supplement effect is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a lithium supplementing device for a negative electrode plate of a lithium ion battery in example 1.
Fig. 2 is a schematic structural diagram of a lithium supplementing device for a negative electrode plate of a lithium ion battery in embodiment 2.
Reference numerals: 1-a melting tank; 2-a lithium cooling unit; 3-a lithium delivery device; 4-a lithium calendering unit; 5-a lithium recovery unit; 6-a transfer roll; 7-molten lithium bath; 8-vapor deposition apparatus.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention necessarily includes necessary piping, conventional valves and general pump equipment for achieving the complete process, but the above contents do not belong to the main inventive points of the present invention, and those skilled in the art can select the layout of the additional equipment based on the process flow and the equipment structure, and the present invention is not particularly limited to this.
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
At present, lithium is supplemented to a pole piece of a lithium ion battery by adopting molten lithium liquid, the problem of poor lithium supplementing uniformity can be solved, residual lithium cannot be recovered, waste is serious, and discontinuous cutting piece lithium supplementing cannot be realized.
In order to solve the technical problems, the invention provides a lithium supplementing device and a lithium supplementing method for a negative pole piece of a lithium ion battery, which can melt and recycle residual lithium on the basis of good lithium supplementing uniformity, and can realize lamination lithium supplementing after cutting pieces of the negative pole piece. In addition, the lithium supplementing process provided by the invention is simple to operate, safe and controllable, and is beneficial to industrial production.
In the embodiment of the invention, the lithium supplementing device for the negative electrode plate of the lithium ion battery comprises a lithium transfer unit, a lithium cooling unit 2, a lithium rolling unit 4, a lithium recovery unit 5 and a lithium conveying device 3, wherein the lithium transfer unit, the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5 are arranged along the material flowing direction, and the lithium conveying device 3 is sleeved on the peripheries of the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5. The lithium transfer unit is configured to transfer the molten lithium liquid 7 to a surface of the lithium delivery device 3. The lithium cooling unit 2 is configured to cool the molten lithium liquid 7 coated on the surface of the lithium delivery device 3 to form a lithium layer. The lithium rolling unit 4 is configured to laminate the lithium to a negative electrode sheet. The lithium recovery unit 5 is configured to recover the lithium layer remaining on the surface of the lithium delivery device 3.
Example 1
The embodiment provides a lithium supplement device for a lithium ion battery negative electrode piece, as shown in fig. 1, the lithium supplement device comprises a lithium transfer unit, a lithium cooling unit 2, a lithium rolling unit 4, a lithium recovery unit 5 and a lithium conveying device 3, wherein the lithium transfer unit, the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5 are arranged along the material flowing direction, and the lithium conveying device 3 is sleeved on the peripheries of the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5. In the present embodiment, the lithium transfer unit is configured to transfer the molten lithium liquid 7 to the surface of the lithium transport device 3, the lithium cooling unit 2 is configured to cool the molten lithium liquid 7 coated on the surface of the lithium transport device 3 to form a lithium layer, the lithium calendaring unit 4 is configured to laminate the lithium onto a negative electrode sheet, and the lithium recovery unit 5 is configured to recover the lithium layer remaining on the surface of the lithium transport device 3.
The lithium transfer unit comprises a melting tank 1 and a transfer roller 6 positioned in the melting tank 1, wherein the melting tank 1 is filled with the molten lithium liquid 7, the transfer roller 6 is in contact with the lithium conveying device 3, and the transfer roller 6 is partially immersed in the molten lithium liquid 7. The lithium transfer unit is configured to transfer the molten lithium liquid 7 to the surface of the lithium delivery device 3 under rotation of the transfer roller 6. The transfer roller 6 and the lithium transport device 3 rotate in the same direction.
The transfer roller 6 is a slightly concave roller. The material of the transfer roller 6 is ceramic. The heating part is arranged inside the transfer roller 6, so that the molten lithium liquid 7 can be prevented from solidifying on the surface of the transfer roller 6 to influence the subsequent coating process.
The lithium delivery device 3 is a conveyor belt. The material of conveyer belt is rubber, conveyer belt surface scribbles ceramic coating.
The lithium cooling unit 2 includes a low temperature roller.
The lithium calendering unit 4 comprises a calendering roller and a negative pole piece, a gap is reserved between the calendering roller and the negative pole piece, and the lithium conveying device 3 penetrates through the gap. The lithium rolling unit 4 is configured to laminate the lithium on the surface of the lithium transport device 3 to the negative electrode sheet by the rolling rollers when the lithium transport device 3 is transferred from the lithium cooling unit 2 to the lithium rolling unit 4.
The lithium recovery unit 5 comprises a high-temperature roller and a recovery roller, a gap is reserved between the high-temperature roller and the recovery roller, the lithium conveying device 3 penetrates through the gap, and the high-temperature roller and the low-temperature roller of the lithium cooling unit 2 rotate to drive the lithium conveying device 3 to rotate. The lithium recovery unit 5 is configured to transfer and recover the remaining lithium layer on the surface of the lithium delivery device 3 by the recovery roller after melting the lithium layer by the high temperature roller when the lithium delivery device 3 is transferred from the lithium calendaring unit 4 to the lithium recovery unit 5. The high-temperature roller and the recovery roller rotate in opposite directions. The low-temperature roller, the calendering roller and the high-temperature roller are distributed in a triangular shape.
The lithium supplementing device further comprises an inert atmosphere chamber. The inert gas is argon, the lithium supplementing devices are all placed in an argon atmosphere chamber, and the lithium supplementing process is all carried out in the argon atmosphere chamber. The argon atmosphere chamber is connected with the gas drying unit, and the gas drying unit is arranged outside the argon atmosphere chamber and used for providing dry argon for the argon atmosphere chamber. The whole lithium supplementing process adopts argon protection, and is safe and controllable.
Application example 1
When lithium is supplemented by the lithium supplementing device for the negative electrode plate of the lithium ion battery shown in fig. 1, firstly, metal lithium is heated to 180 ℃ in the melting tank 1 to obtain molten lithium liquid 7. The molten lithium liquid 7 is uniformly coated on the surface of the conveyor belt through a transfer roller 6, and the molten lithium liquid 7 on the surface of the conveyor belt forms a solid lithium layer after passing through a lithium cooling unit 2 with the temperature of 150 ℃. And then laminating the lithium on the surface of the conveyor belt to the negative pole piece through a calendering roller in a lithium calendering unit 4 to obtain the lithium-supplemented negative pole piece. And finally, melting the residual lithium layer on the surface of the lithium conveying device 3 through a high-temperature roller of the lithium recovery unit 5, and transferring and recovering the molten lithium layer through the recovery roller, wherein the temperature of the lithium recovery unit 5 is 180 ℃. The whole lithium supplement process is carried out in an argon atmosphere.
Example 2
The embodiment provides a lithium supplement device for a lithium ion battery negative electrode piece, as shown in fig. 2, the lithium supplement device comprises a lithium transfer unit, a lithium cooling unit 2, a lithium rolling unit 4, a lithium recovery unit 5 and a lithium conveying device 3, wherein the lithium transfer unit, the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5 are arranged along the material flowing direction, and the lithium conveying device 3 is sleeved on the peripheries of the lithium cooling unit 2, the lithium rolling unit 4 and the lithium recovery unit 5. In the present embodiment, the lithium transfer unit is configured to transfer the molten lithium liquid 7 to the surface of the lithium transport device 3, the lithium cooling unit 2 is configured to cool the molten lithium liquid 7 coated on the surface of the lithium transport device 3 to form a lithium layer, the lithium calendaring unit 4 is configured to laminate the lithium onto a negative electrode sheet, and the lithium recovery unit 5 is configured to recover the lithium layer remaining on the surface of the lithium transport device 3.
The lithium transfer unit comprises a vapor deposition device 8, and the vapor deposition device 8 coats the molten lithium liquid 7 on the surface of the lithium conveying device 3 by adopting a vapor deposition method, so that the lithium supplement uniformity is further improved.
The structure of the vapor deposition device 8 is not particularly required and limited in the present invention, and the vapor deposition device 8 is used to coat the molten lithium liquid 7 on the surface of the lithium delivery device 3. It is therefore understood that the vapor deposition apparatus 8 capable of coating molten lithium on the surface of the lithium transport device 3 may be used in the present invention, and those skilled in the art may select different types of vapor deposition apparatuses 8 according to the use scenario or may adapt the structure of the vapor deposition apparatus 8.
Illustratively, the present invention provides a conventional structure of a vapor deposition apparatus 8, including: a transfer chamber, a heating component, a spray head assembly, a brake component, a transfer component, and the like.
The lithium delivery device 3 is a conveyor belt. The conveyor belt is made of metal foil, and the surface of the conveyor belt is coated with a ceramic coating; the metal foil is a copper foil.
The lithium cooling unit 2 includes a low temperature roller.
The lithium calendering unit 4 comprises a calendering roller and a negative pole piece, a gap is reserved between the calendering roller and the negative pole piece, and the lithium conveying device 3 penetrates through the gap. The lithium rolling unit 4 is configured to laminate the lithium on the surface of the lithium transport device 3 to the negative electrode sheet by the rolling rollers when the lithium transport device 3 is transferred from the lithium cooling unit 2 to the lithium rolling unit 4.
The lithium recovery unit 5 comprises a high-temperature roller and a recovery roller, a gap is reserved between the high-temperature roller and the recovery roller, the lithium conveying device 3 penetrates through the gap, and the high-temperature roller and the low-temperature roller of the lithium cooling unit 2 rotate to drive the lithium conveying device 3 to rotate. The lithium recovery unit 5 is configured to transfer and recover the remaining lithium layer on the surface of the lithium delivery device 3 by the recovery roller after melting the lithium layer by the high temperature roller when the lithium delivery device 3 is transferred from the lithium calendaring unit 4 to the lithium recovery unit 5. The high-temperature roller and the recovery roller rotate in opposite directions. The low-temperature roller, the calendering roller and the high-temperature roller are distributed in a triangular shape.
In the invention, the lithium supplementing device also comprises a vacuum chamber, the lithium supplementing devices are all placed in the vacuum chamber, and the lithium supplementing process is all carried out in the vacuum chamber. The whole lithium supplementing process adopts vacuum and inert gas protection, and is safe and controllable.
Application example 2
When the lithium supplementing device for the negative electrode plate of the lithium ion battery shown in fig. 2 is used for supplementing lithium, firstly, a vapor deposition device 8 is used for uniformly coating molten lithium liquid 7 on the surface of a conveyor belt. The molten lithium 7 on the surface of the conveyor belt passes through the lithium cooling unit 2 at a temperature of 100 ℃ to form a solid lithium layer. And then laminating the lithium on the surface of the conveyor belt to the negative pole piece through a calendering roller in a lithium calendering unit 4 to obtain the lithium-supplemented negative pole piece. And finally, melting the residual lithium layer on the surface of the lithium conveying device 3 through a high-temperature roller of the lithium recovery unit 5, and transferring and recovering the molten lithium layer through the recovery roller, wherein the temperature of the lithium recovery unit 5 is 200 ℃. The whole lithium supplement process is carried out in a vacuum environment.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The lithium supplementing device is characterized by comprising a lithium transfer unit, a lithium cooling unit, a lithium rolling unit, a lithium recovery unit and a lithium conveying device, wherein the lithium transfer unit, the lithium cooling unit, the lithium rolling unit and the lithium recovery unit are arranged along the material flowing direction, the lithium conveying device is sleeved at the peripheries of the lithium cooling unit, the lithium rolling unit and the lithium recovery unit, and the lithium conveying device is arranged at the periphery of the lithium cooling unit, the lithium rolling unit and the lithium recovery unit in a sleeved mode
The lithium transfer unit is configured to transfer molten lithium liquid to a surface of the lithium delivery device,
the lithium cooling unit is configured to cool the molten lithium liquid coated on the surface of the lithium delivery device to form a lithium layer,
the lithium calendering unit is configured to laminate the lithium onto a negative electrode sheet, and
the lithium recovery unit is configured to recover the lithium layer remaining on the surface of the lithium delivery device.
2. The lithium replenishing device according to claim 1, wherein the lithium transfer unit comprises a melting tank into which the molten lithium liquid is injected and a transfer roller located in the melting tank, the transfer roller being in contact with the lithium delivery device and being partially immersed in the molten lithium liquid,
the lithium transfer unit is configured to transfer the molten lithium liquid to a surface of the lithium delivery device under rotation of the transfer roller;
preferably, the transfer roller and the lithium delivery device rotate in the same direction.
3. The lithium replenishing device according to claim 2, wherein the transfer roller is a micro-concave roller or a concave roller;
preferably, the material of the transfer roller is ceramic;
preferably, the material of the transfer roller is metal, and the surface of the transfer roller is coated with a ceramic coating;
preferably, the transfer roller is internally provided with a heating member.
4. The lithium replenishing device according to claim 1, wherein the lithium transfer unit comprises a vapor deposition device.
5. The lithium replenishing device according to any one of claims 1 to 4, wherein the lithium conveying device is a conveyor belt;
preferably, the material of the conveyor belt is any one of rubber, plastic or metal foil, and the surface of the conveyor belt is coated with a ceramic coating;
preferably, the metal foil is a copper foil or an iron foil;
preferably, the lithium cooling unit includes a low temperature roller.
6. The lithium supplementing device according to any one of claims 1 to 5, wherein the lithium rolling unit comprises a rolling roller and a negative pole piece, a gap is left between the rolling roller and the negative pole piece, and the lithium conveying device passes through the gap,
the lithium rolling unit is configured to laminate the lithium on the surface of the lithium conveying device to the negative electrode sheet by the rolling roller while the lithium conveying device is conveyed from the lithium cooling unit to the lithium rolling unit.
7. The lithium supplementing device according to any one of claims 1 to 6, wherein the lithium recovering unit comprises a high temperature roller and a recovering roller, a gap is reserved between the high temperature roller and the recovering roller, the lithium conveying device passes through the gap, the rotation of the high temperature roller and the low temperature roller of the lithium cooling unit drives the lithium conveying device to rotate,
the lithium recovery unit is configured to transfer and recover residual lithium layers on the surface of the lithium conveying device through the recovery roller after the residual lithium layers are melted by the high-temperature roller when the lithium conveying device is conveyed from the lithium calendaring unit to the lithium recovery unit;
preferably, the high-temperature roller and the recovery roller rotate in opposite directions;
preferably, the low temperature roll, the calendering roll and the high temperature roll are distributed in a triangular shape.
8. A lithium supplementing method for a lithium ion battery negative pole piece is characterized in that the lithium supplementing method adopts the lithium supplementing device according to any one of claims 1 to 7,
the lithium supplementing method comprises the following steps:
coating the molten lithium liquid on the surface of the lithium delivery device by the lithium transfer unit;
passing the lithium delivery device through the lithium cooling unit so that the molten lithium liquid on the surface of the lithium delivery device is cooled by the lithium cooling unit to form a solid lithium layer;
passing the lithium conveying device through the lithium calendering unit so as to laminate the lithium to the surface of the negative pole piece through the lithium calendering unit to obtain a lithium-supplemented negative pole piece; and
passing the lithium delivery device through the lithium recovery unit to recover the remaining lithium layer on the surface of the lithium delivery device by the lithium recovery unit.
9. The lithium supplement method according to claim 8, wherein the lithium supplement method is performed under vacuum or inert gas environment;
preferably, the vacuum degree of the vacuum is less than or equal to-60 MPa;
preferably, the inert gas comprises any one of helium, neon, argon, krypton or xenon or a combination of at least two thereof.
10. The lithium supplementing method according to claim 8 or 9, wherein the molten lithium liquid is obtained by heating metallic lithium to a temperature of 180 ℃ or higher;
preferably, the temperature of the lithium cooling unit is < 180 ℃;
preferably, the temperature of the lithium recovery unit is ≥ 180 ℃.
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008077963A (en) * | 2006-09-21 | 2008-04-03 | Matsushita Electric Ind Co Ltd | Method and device to store lithium ion in negative electrode precursor for non-aqueous electrolyte secondary battery |
| JP2013008602A (en) * | 2011-06-27 | 2013-01-10 | Panasonic Corp | Manufacturing apparatus and manufacturing method of negative electrode for lithium secondary battery |
| CN108598372A (en) * | 2018-06-26 | 2018-09-28 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece mends lithium system and mends lithium method |
| CN109256526A (en) * | 2017-07-12 | 2019-01-22 | 宁德时代新能源科技股份有限公司 | Lithium device is mended to pole piece |
| CN109360943A (en) * | 2018-12-03 | 2019-02-19 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece mends lithium device and mends lithium method |
| CN110438469A (en) * | 2019-08-08 | 2019-11-12 | 兰溪致德新能源材料有限公司 | The apparatus and method of lithium ion battery plus-negative plate material C VD benefit lithium |
| CN111162246A (en) * | 2018-11-08 | 2020-05-15 | 中国科学院化学研究所 | Continuous controllable effective pre-lithiation system and lithium supplementing method |
| CN210805916U (en) * | 2019-11-21 | 2020-06-19 | 宁德时代新能源科技股份有限公司 | Lithium device is mended to pole piece |
| CN210956887U (en) * | 2019-10-12 | 2020-07-07 | 界首市天鸿新材料股份有限公司 | A calender for production of lithium cell inlayer complex film |
| CN111682163A (en) * | 2020-06-10 | 2020-09-18 | 中国电子科技集团公司第十八研究所 | Lithium transfer type lithium supplementing method for lithium battery |
| CN112038582A (en) * | 2020-10-10 | 2020-12-04 | 合肥国轩高科动力能源有限公司 | Lithium supplementing device and lithium supplementing method |
| CN112234168A (en) * | 2020-10-15 | 2021-01-15 | 东莞赣锋电子有限公司 | Lithium ion battery pole piece lithium supplementing device and method thereof |
| CN112397688A (en) * | 2020-11-16 | 2021-02-23 | 东莞塔菲尔新能源科技有限公司 | Lithium system is mended to pole piece |
| WO2021032035A1 (en) * | 2019-08-20 | 2021-02-25 | 北京卫蓝新能源科技有限公司 | Gravure coating device for preparing large-width ultrathin metal lithium strip and method therefor |
| CN112467084A (en) * | 2020-11-23 | 2021-03-09 | 惠州赣锋锂电科技有限公司 | Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof |
| US20210135274A1 (en) * | 2017-04-03 | 2021-05-06 | Lg Chem, Ltd. | Pre-lithiation apparatus, method of producing negative electrode unit and negative electrode unit |
| CN113451544A (en) * | 2021-09-01 | 2021-09-28 | 浙江金羽新能源科技有限公司 | Pre-lithiation pole piece, preparation method, production system and lithium ion battery |
-
2021
- 2021-10-19 CN CN202111217449.XA patent/CN113964295B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008077963A (en) * | 2006-09-21 | 2008-04-03 | Matsushita Electric Ind Co Ltd | Method and device to store lithium ion in negative electrode precursor for non-aqueous electrolyte secondary battery |
| JP2013008602A (en) * | 2011-06-27 | 2013-01-10 | Panasonic Corp | Manufacturing apparatus and manufacturing method of negative electrode for lithium secondary battery |
| US20210135274A1 (en) * | 2017-04-03 | 2021-05-06 | Lg Chem, Ltd. | Pre-lithiation apparatus, method of producing negative electrode unit and negative electrode unit |
| CN109256526A (en) * | 2017-07-12 | 2019-01-22 | 宁德时代新能源科技股份有限公司 | Lithium device is mended to pole piece |
| CN108598372A (en) * | 2018-06-26 | 2018-09-28 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece mends lithium system and mends lithium method |
| CN111162246A (en) * | 2018-11-08 | 2020-05-15 | 中国科学院化学研究所 | Continuous controllable effective pre-lithiation system and lithium supplementing method |
| CN109360943A (en) * | 2018-12-03 | 2019-02-19 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece mends lithium device and mends lithium method |
| CN110438469A (en) * | 2019-08-08 | 2019-11-12 | 兰溪致德新能源材料有限公司 | The apparatus and method of lithium ion battery plus-negative plate material C VD benefit lithium |
| WO2021032035A1 (en) * | 2019-08-20 | 2021-02-25 | 北京卫蓝新能源科技有限公司 | Gravure coating device for preparing large-width ultrathin metal lithium strip and method therefor |
| CN210956887U (en) * | 2019-10-12 | 2020-07-07 | 界首市天鸿新材料股份有限公司 | A calender for production of lithium cell inlayer complex film |
| CN210805916U (en) * | 2019-11-21 | 2020-06-19 | 宁德时代新能源科技股份有限公司 | Lithium device is mended to pole piece |
| CN111682163A (en) * | 2020-06-10 | 2020-09-18 | 中国电子科技集团公司第十八研究所 | Lithium transfer type lithium supplementing method for lithium battery |
| CN112038582A (en) * | 2020-10-10 | 2020-12-04 | 合肥国轩高科动力能源有限公司 | Lithium supplementing device and lithium supplementing method |
| CN112234168A (en) * | 2020-10-15 | 2021-01-15 | 东莞赣锋电子有限公司 | Lithium ion battery pole piece lithium supplementing device and method thereof |
| CN112397688A (en) * | 2020-11-16 | 2021-02-23 | 东莞塔菲尔新能源科技有限公司 | Lithium system is mended to pole piece |
| CN112467084A (en) * | 2020-11-23 | 2021-03-09 | 惠州赣锋锂电科技有限公司 | Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof |
| CN113451544A (en) * | 2021-09-01 | 2021-09-28 | 浙江金羽新能源科技有限公司 | Pre-lithiation pole piece, preparation method, production system and lithium ion battery |
Non-Patent Citations (4)
| Title |
|---|
| 孙仲振等: "锂离子电池预锂化技术的研究", 《化工管理》 * |
| 孙仲振等: "锂离子电池预锂化技术的研究", 《化工管理》, no. 25, 1 September 2020 (2020-09-01), pages 77 - 78 * |
| 朱亮等: "锂离子电池预锂化技术的研究现状", 《电池》 * |
| 朱亮等: "锂离子电池预锂化技术的研究现状", 《电池》, vol. 48, no. 03, 25 June 2018 (2018-06-25), pages 206 - 209 * |
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