CN115305445B - Pole piece lithium supplementing device and lithium supplementing method - Google Patents

Pole piece lithium supplementing device and lithium supplementing method Download PDF

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Publication number
CN115305445B
CN115305445B CN202211099334.XA CN202211099334A CN115305445B CN 115305445 B CN115305445 B CN 115305445B CN 202211099334 A CN202211099334 A CN 202211099334A CN 115305445 B CN115305445 B CN 115305445B
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lithium
liquid
supplementing
pool
pole piece
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CN115305445A (en
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张永胜
丁雷
张永祺
邓天泽
刘玉洲
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Suzhou Maxwell Technologies Co Ltd
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Suzhou Maxwell Technologies Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
    • C23C14/562—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks for coating elongated substrates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/54—Controlling or regulating the coating process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
    • C23C14/564—Means for minimising impurities in the coating chamber such as dust, moisture, residual gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0421—Methods of deposition of the material involving vapour deposition
    • H01M4/0423—Physical vapour deposition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The application discloses a pole piece lithium supplementing device and a pole piece lithium supplementing method, and belongs to the technical field of lithium battery lithium supplementing. The pole piece lithium supplementing device comprises an unreeling vacuum cavity, a lithium supplementing vacuum cavity, a reeling vacuum cavity and a solid lithium liquefying device, wherein the unreeling vacuum cavity, the lithium supplementing vacuum cavity and the reeling vacuum cavity are arranged along the material flowing direction; the lithium supplementing vacuum cavity is provided with a first liquid lithium pool and a first heating device, the solid lithium liquefying device is provided with a second liquid lithium pool, the second liquid lithium pool is connected with the first liquid lithium pool through a guide pipe, the first heating device is configured to heat a lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity, and the first liquid lithium pool is provided with a first detection part for detecting the liquid level; the lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recovery unit through pipelines. The application can improve the utilization rate of the lithium source, improve the production efficiency and ensure the evaporation effect.

Description

Pole piece lithium supplementing device and lithium supplementing method
Technical Field
The application belongs to the technical field of lithium battery lithium supplementing, and particularly relates to a pole piece lithium supplementing device and a lithium supplementing method.
Background
The formation is a process of charging the lithium ion battery for the first time, and when the lithium ion battery is formed, the process mainly comprises the process of charging the battery core for the first time after the battery core finishes liquid injection, and the process activates active substances in the battery, so that the lithium ion battery is activated, and the charge and discharge performance, self-discharge, storage and other comprehensive performances of the battery are improved. In the formation process of the lithium ion battery, electrochemical reaction can occur in the battery, a passivation thin layer (Solid Electrolyte Interface, SEI film) covering the surface of the carbon electrode is formed on the phase interface of the negative electrode and the electrolyte, and the SEI film has the property of solid electrolyte, but the SEI film is formed to consume the original lithium ions in the battery, so that the initial capacity loss, the cycle life reduction, the multiplying power performance reduction and the like of the lithium ion battery are caused, and the improvement of the energy density of the lithium ion battery is limited. In view of the above, by supplementing lithium elements on the surface of the high-capacity low-first-efficiency negative electrode plate, the first-time efficiency of the lithium ion battery containing the negative electrode can be effectively improved and the cycle performance can be improved.
In the related art, there are various forms of lithium-supplementing process for the negative electrode of the lithium ion battery, such as lithium foil lithium supplementing, lithium powder lithium supplementing, lithium metal negative electrode, and the like. However, the conventional lithium foil technology process can only achieve the micron (μm) level and is relatively complex and difficult to control, so that most of the current lithium supplementing operation is completed by adopting an evaporation lithium plating mode, the evaporation lithium plating technology is simpler than a mode of directly compounding a lithium foil with a negative electrode, and can ensure uniformity of lithium supplementing, but the conventional evaporation lithium plating device or technology has certain defects, for example, during evaporation plating, due to the characteristic of physical vapor deposition, movement of gaseous lithium atoms is uncontrollable, and lithium atoms which do not reach the surface of a pole piece are deposited on the inner wall of a lithium supplementing vacuum cavity and combined to form a lithium atom film, so that the utilization rate of a lithium source can be reduced, and waste of the lithium source is caused. In addition, the purity of the lithium atom film on the inner wall of the device is higher, and the lithium atom film deposited on the inner wall is required to be subjected to cavity opening and cleaning because of the extremely easy combustion of the active chemical property of the metal lithium, however, the operation of repeatedly breaking vacuum and vacuumizing reduces the production efficiency and has a large potential safety hazard. Accordingly, there is still a need for improvements in existing pole piece lithium replenishment devices or methods.
Disclosure of Invention
In view of the above-described problems, the present invention aims to solve, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides the pole piece lithium supplementing device and the pole piece lithium supplementing method, which can relieve the problem of cleaning the film formed by depositing part of lithium atoms on the inner wall of the cavity in the prior art, can improve the production efficiency, has better safety and can realize the recycling of lithium.
In order to solve the technical problems, the application is realized as follows:
According to one aspect of the application, there is provided a pole piece lithium supplementing device, which comprises an unreeling vacuum cavity, a lithium supplementing vacuum cavity, a reeling vacuum cavity and a solid lithium liquefying device communicated with the lithium supplementing vacuum cavity, wherein the unreeling vacuum cavity, the lithium supplementing vacuum cavity and the reeling vacuum cavity are arranged along the material flowing direction;
the lithium supplementing vacuum cavity is provided with a first liquid lithium pool and a first heating device, the solid lithium liquefying device is provided with a second liquid lithium pool, the second liquid lithium pool is connected with the first liquid lithium pool through a guide pipe, the first heating device is configured to heat a lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity, and the first liquid lithium pool is provided with a first detection component for detecting the liquid level;
The lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recovery unit through pipelines.
In some embodiments, the solid lithium liquefying device comprises a feeding chamber, a vacuum chamber and a lithium source liquefying vacuum chamber which are sequentially arranged, and the vacuum chamber and the lithium source liquefying vacuum chamber are respectively connected with the vacuumizing device.
In some embodiments, a lithium transfer unit is disposed in the solid lithium liquefying device, and the lithium transfer unit is used for transferring a lithium source disposed in the feeding chamber to the vacuum chamber for vacuum treatment, and then transferring the lithium source to the lithium source liquefying vacuum chamber.
In some of these embodiments, the lithium transfer unit includes a conveyor belt and a driving mechanism for driving the conveyor belt in motion.
In some embodiments, seals are provided between the dosing chamber and the vacuum chamber, and between the vacuum chamber and the lithium source liquefaction vacuum chamber.
In some embodiments, the solid-state lithium liquefaction device is further provided with a second heating device configured to heat a lithium layer deposited on an inner wall of the solid-state lithium liquefaction device, the second liquid lithium pool and the second heating device being both located within the lithium source liquefaction vacuum chamber.
In some embodiments, the second liquid lithium pool is provided with a second detection component for detecting the liquid level.
In some embodiments, a cover plate is disposed in the lithium supplementing vacuum chamber, and the cover plate is openable and closable and disposed above the first liquid lithium pool.
In some embodiments, a cover plate is arranged in the lithium source liquefaction vacuum chamber, and the cover plate is arranged above the second liquid lithium pool in an openable and closable manner.
In some embodiments, the lithium recovery unit comprises a first lithium recovery bin and a second lithium recovery bin, the lithium supplementing vacuum cavity is connected with the first lithium recovery bin through a first recovery pipe, and the solid-state lithium liquefying device is connected with the second lithium recovery bin through a second recovery pipe.
In some embodiments, a first valve group is disposed on the first recovery pipe; and/or a second valve group is arranged on the second recovery pipe; and/or a third valve group is arranged on the conduit.
In some embodiments, the lithium supplementing vacuum cavity is provided with a third heating device for heating the lithium source in the first liquid lithium pool.
In some of these embodiments, the solid state lithium liquefaction device is provided with fourth heating means for heating the lithium source in the second liquid lithium pool.
In some embodiments, the unreeling vacuum cavity and the reeling vacuum cavity are internally provided with a roller for winding the pole piece, the lithium supplementing vacuum cavity is internally provided with a cooling roller matched with the roller, and the cooling roller is provided with a cooling device.
According to another aspect of the present application, there is provided a pole piece lithium supplementing method, the lithium supplementing method adopting the pole piece lithium supplementing device as described above, the lithium supplementing method comprising:
heating and melting a solid lithium source in a solid lithium liquefying device into liquid lithium;
conveying liquid lithium in a second liquid lithium pool in the solid lithium liquefying device to the first liquid lithium pool through a guide pipe; detecting the liquid level in the first liquid lithium pool by using the first detection component, and closing the third valve group when the liquid level reaches a preset height, so as to stop conveying liquid lithium into the first liquid lithium pool;
In a vacuum environment, conveying the pole piece to the upper part of the first liquid lithium pool, and vaporizing the liquid lithium in the first liquid lithium pool so as to enable the lithium to be vaporized and deposited on the pole piece;
After the pole piece lithium supplementing is completed, the first heating device and the second heating device are used for heating the lithium layers deposited on the inner wall of the lithium supplementing vacuum cavity and the inner wall of the solid lithium liquefying device respectively, so that recovered liquid lithium is obtained, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
In some embodiments, in the lithium supplementing method, during the process of depositing lithium on the pole piece, opening a cover plate positioned above the first liquid lithium pool; after the pole piece lithium supplementing is completed, a cover plate positioned above the first liquid lithium pool is closed to prevent evaporation of liquid lithium.
In some embodiments, the method for supplementing lithium includes detecting a liquid level in a first liquid lithium pool by using a first detection component, automatically conveying liquid lithium into the first liquid lithium pool when the liquid level is reduced by a preset height, closing a third valve group after supplementing the lithium source, and conveying the solid lithium source into a second liquid lithium pool.
In some embodiments, the liquid level of liquid lithium in the first liquid lithium pool is 8mm to 12mm.
The implementation of the technical scheme of the invention has at least the following beneficial effects:
The pole piece lithium supplementing device provided by the embodiment of the application is not only provided with an unreeling vacuum cavity, a lithium supplementing vacuum cavity and a reeling vacuum cavity, but also provided with an independent solid lithium liquefying device which is communicated with the lithium supplementing vacuum cavity. Through making the second liquid lithium pond in the solid-state lithium liquefaction device be linked together through the pipe with the first liquid lithium pond in the moisturizing vacuum chamber, can flow towards the first liquid lithium pond by the second liquid lithium pond in the solid-state lithium liquefaction device after the liquefaction in, when carrying out pole piece moisturizing operation, need not to carry out the chamber and supplement raw materials like this, can avoid because of supplementing the problem that the raw materials needs broken vacuum, the production efficiency that the heavy evacuation caused reduces, has simplified the operation, has improved production efficiency. And be provided with the first heating device that can carry out the heating to the lithium layer of deposit on the lithium supplementing vacuum chamber inner wall in the lithium supplementing vacuum chamber, from this, can carry out the cleanness of cavity inner wall when production is finished, make the lithium layer liquefaction on the cavity inner wall, alleviate the clean problem of evaporation coating film back partial lithium atom at lithium supplementing vacuum chamber inner wall film formation, improved the utilization ratio of lithium source, reduced the potential safety hazard. Meanwhile, the lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recycling unit through pipelines, and liquid lithium obtained after the lithium layers on the inner walls of the cavities are heated possibly needs to be treated and then reused, so that the liquid lithium obtained after heating can flow into the lithium recycling unit to be recycled, stored or post-treated through the arrangement of the lithium recycling unit, the recycling of lithium is realized, the utilization rate of lithium resources is improved, the waste of lithium is reduced or avoided, and the cost is reduced.
Simultaneously, first liquid lithium pond is provided with the first detection component that is arranged in detecting liquid level, detects the height of liquid lithium liquid level in the first liquid lithium pond through first detection component, can guarantee that the lithium source is abundant, guarantees the coating by vaporization effect, can alleviate evaporation liquid level decline, the problem that influences strip surface lithium film uniformity that the continuous consumption leads to after the lithium source liquefaction, enables the lithium supplementing homogeneity and obtains guaranteeing.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
Fig. 1 is a schematic structural diagram of a pole piece lithium supplementing device according to some embodiments of the present invention;
Fig. 2 is a schematic structural diagram of a solid lithium liquefying device in a pole piece lithium supplementing device according to some embodiments of the present invention;
fig. 3 is a schematic structural diagram of another lithium-ion battery device with a pole piece according to some embodiments of the present invention.
Reference numerals illustrate:
10-unreeling the vacuum chamber; 101, unreeling rollers;
20-lithium supplementing vacuum cavity; 201-a first liquid lithium pool; 202-a first heating device; 203-a third heating device; 204-a first detection component; 205-cover plate; 206-cooling rollers; 261-a first chill roll; 262-a second chill roll; 207-roller set;
30-rolling the vacuum cavity; 301-a wind-up roll;
40-solid lithium liquefaction device; 401-a feeding chamber; 411-lithium transport unit; 4111-conveyor belt; 4112-drive mechanism; 402-a vacuum chamber; 403-lithium source liquefaction vacuum chamber; 431-a second liquid lithium pool; 432-a second heating device; 433-fourth heating means; 434-a second detection component; 404-a seal;
51-a first lithium recovery bin; 52-a second lithium recovery bin; 60-vacuumizing device; 70-valve; 80-pole pieces;
910-a first recovery tube; 911-first valve group; 920-a second recovery tube; 921-a second valve group; 930-a catheter; 931-third valve group.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For a range of values, one or more new ranges of values may be obtained by combining each other between the endpoints of each range, or between the individual points, and between the individual points.
In the related art, the pole piece lithium supplementing operation is performed by adopting the evaporation lithium plating process, so that the problems of cleaning or safety and the like of forming a lithium layer by depositing part of lithium on the inner wall of a chamber exist, and the problems of heating and vaporizing a lithium source when the lithium source is used up, carrying out the supplement of the lithium source after the environment is broken into vacuum and cooled, reducing the production efficiency, introducing new impurities and polluting a lithium atom film exist. In addition, the current pole piece lithium supplementing device, along with the gradual consumption of a lithium source, the distance between the lithium source and the pole piece is larger and larger, so that the uniformity of the thickness of a lithium layer is influenced, and the process efficiency cannot be ensured.
In view of this, the technical scheme of the embodiment of the application provides an improved pole piece lithium supplementing device and a pole piece lithium supplementing method. The technical scheme of the embodiment of the application can relieve the cleaning problem of film formation of redundant lithium atoms on the inner wall of the chamber after evaporation coating or the safety problem caused by film formation, and achieves the purposes of improving the utilization rate of lithium, realizing the recycling of lithium and reducing potential safety hazards; the problems of production efficiency reduction caused by the need of breaking vacuum and re-vacuumizing the supplementary raw materials after the use of the lithium source is finished can be solved, and the purposes of simplifying the operation flow and improving the production efficiency are achieved; the problems of evaporation liquid level reduction and influence on uniformity of lithium films on the surface of the strip caused by continuous consumption of the liquefied lithium source can be alleviated, and the purposes of ensuring sufficiency of the lithium source, ensuring evaporation effect and improving uniformity of lithium supplement are achieved. The description of the specific technical scheme is provided below.
Referring to fig. 1 to 3, in some embodiments, a pole piece lithium supplementing device is provided, which includes an unreeling vacuum chamber 10, a lithium supplementing vacuum chamber 20, a reeling vacuum chamber 30, and a solid lithium liquefying device 40 in communication with the lithium supplementing vacuum chamber 20.
The unreeling vacuum cavity 10 is used for unreeling a coiled material of the pole piece 80 to the lithium supplementing vacuum cavity 20, the lithium supplementing vacuum cavity 20 is used for carrying out lithium supplementing operation on the pole piece 80 on the coiled material of the pole piece 80, and the reeling vacuum cavity 30 is used for reeling the pole piece 80 subjected to lithium supplementing by the lithium supplementing vacuum cavity 20; the solid lithium liquefying device 40 may be independently disposed, and the solid lithium liquefying device 40 is communicated with the lithium supplementing vacuum chamber 20, and may be used for supplementing a lithium source, liquefying the solid lithium source to form liquid lithium, and delivering the liquid lithium into the lithium supplementing vacuum chamber 20.
Optionally, the lithium supplementing vacuum cavity can supplement lithium to one side or two sides of the pole piece. As shown in fig. 1, in this embodiment, the lithium-supplementing vacuum chamber 20 may supplement lithium to one side of the pole piece 80. As shown in fig. 3, the lithium-ion replenishing vacuum chamber 20 may be used to double-sided replenish lithium for the pole piece 80, and the process and arrangement of double-sided replenishing lithium will be described later. As shown in fig. 1, when single-sided lithium supplementing is performed, one cooling roller 206 may be disposed, and the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20, and the reeling vacuum chamber 30 may be sequentially disposed. The single-sided lithium supplementing method can be that the pole piece 80 released by the unreeling roller 101 in the unreeling vacuum cavity 10 enters the cooling roller 206 after passing through the roller group 207, the cooling roller 206 is abutted with one side of the pole piece 80, and in the lithium supplementing vacuum cavity 20, liquid lithium is vaporized and deposited on the other side surface of the pole piece 80 so as to deposit and form a lithium layer on one side surface of the pole piece 80; the pole piece 80 from the cooling roller 206 passes through the roller group 207 and then enters the winding roller 301 in the winding vacuum cavity 30 for winding.
It should be understood that the device and method for supplementing lithium to pole pieces in this embodiment are mainly described by taking a single-sided lithium supplementing manner as an example, and the two-sided lithium supplementing has the same or similar principle.
The pole piece lithium supplementing device can be applied to a formation system of a lithium ion battery, can provide more lithium ions for the formation of a solid electrolyte interface film (SEI film), and further is beneficial to improving the energy density of the lithium ion battery.
Optionally, the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20, and the reeling vacuum chamber 30 are respectively connected with a plurality of vacuum pumping devices 60. Thus, the unreeling vacuum cavity 10, the lithium supplementing vacuum cavity 20 and the reeling vacuum cavity 30 are conveniently and respectively vacuumized, the independent control of the vacuum degree of each cavity can be realized, the operation is convenient, and the control is easy.
Alternatively, the pole piece 80 may comprise a positive pole piece or a negative pole piece, preferably a negative pole piece.
In this embodiment, a first liquid lithium pool 201 and a first heating device 202 are disposed in the lithium supplementing vacuum cavity 20, a second liquid lithium pool 431 and a second heating device 432 are disposed in the solid lithium liquefying device 40, the second liquid lithium pool 431 is connected with the first liquid lithium pool 201 through a conduit 930, the first heating device 202 is configured to heat a lithium layer (lithium film) deposited on an inner wall of the lithium supplementing vacuum cavity 20, the second heating device 432 is configured to heat a lithium layer deposited on an inner wall of the solid lithium liquefying device 40, and the first liquid lithium pool 201 is provided with a first detecting component 204 for detecting a liquid level.
Alternatively, the first detecting member 204 may be a height sensor or a liquid level sensor, etc., and the specific type of the first detecting member 204 is not limited in this embodiment, as long as it can be used to detect the lithium liquid level in the lithium cell. In addition, the pole piece lithium supplementing device can be provided with a controller, and the first detection part 204 can be in signal connection with the controller. The controller may be any of various controllers well known in the related art, and the specific structure and operation principle of the controller may refer to the prior art, which is not limited in this embodiment, and will not be described in detail herein.
In this embodiment, the lithium supplementing vacuum chamber 20 and the solid lithium liquefying device 40 are connected to the lithium recovery unit through pipelines, respectively. For example, the lithium supplementing vacuum chamber 20 and the solid-state lithium liquefying device 40 may be connected to the lithium recovery unit through two pipes, respectively; or the lithium supplementing vacuum cavity 20 is connected with one lithium recovery unit through a pipeline, and the solid-state lithium liquefying device 40 is connected with the other lithium recovery unit through another pipeline.
When the pole piece lithium supplementing device works, the unreeling vacuum cavity 10, the lithium supplementing vacuum cavity 20 and the reeling vacuum cavity 30 can be vacuumized respectively until required vacuum degree is achieved, the pole piece 80 can be unreeled into the pole piece lithium supplementing vacuum cavity 20, a lithium source liquefied by the solid lithium liquefying device 40 is conveyed to the first liquid lithium pool 201 of the lithium supplementing vacuum cavity 20 through the guide pipe 930, the liquid level of the lithium source in the first liquid lithium pool 201 is detected by the first detecting component 204, after the preset height is achieved, the conveying of the lithium source can be stopped, the cover plate 205 positioned above the first liquid lithium pool 201 is opened, the sufficiency of the lithium source is ensured in the process, the liquid lithium in the first liquid lithium pool 201 is further heated to be vaporized, and the vacuum lithium is carried out on the surface of the electrode pole piece bearing electrode active material by the evaporating lithium source under the vacuum condition, so that an evaporating lithium layer is formed. After the vacuum evaporation is finished, the cover plate 205 is closed, and at this time, the first heating device 202 and the second heating device 432 can be turned on, so that the lithium film attached to the inner walls of the lithium supplementing vacuum chamber 20 and the solid lithium liquefying device 40 can be liquefied, and the recovered lithium can flow into the lithium recovery unit through the pipeline, and the lithium can be recovered and reused.
Therefore, according to the technical scheme provided by the embodiment of the application, through additionally arranging the independent solid lithium liquefying device 40 and enabling the second liquid lithium pool 431 in the solid lithium liquefying device 40 to be communicated with the first liquid lithium pool 201 in the lithium supplementing vacuum cavity 20 through the guide pipe 930, liquefied liquid lithium can flow into the first liquid lithium pool 201 from the second liquid lithium pool 431 through the guide pipe 930, so that when the lithium supplementing operation of the pole piece 80 is carried out, cavity opening supplementing raw materials are not needed, the problem of production efficiency reduction caused by the fact that the supplementing raw materials need to be broken and re-vacuumized after the lithium source is used is avoided, the operation is simplified, and the production efficiency is improved.
According to the technical scheme provided by the embodiment of the application, the first heating device 202 which can heat the lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity 20 is arranged in the lithium supplementing vacuum cavity 20, and the second heating device 432 which can heat the lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity is arranged in the solid lithium liquefying device 40, so that the inner wall of the cavity can be cleaned when the pole coil is replaced, for example, the first heating device 202 and the second heating device 432 can be used for heating the inner wall of each cavity respectively, so that the lithium film attached on the inner wall of each cavity is liquefied, the problem of cleaning the film formation of part of lithium atoms on the inner walls of the lithium supplementing vacuum cavity 20 and the solid lithium liquefying device 40 after the evaporation coating is solved, the utilization rate of a lithium source is improved, and the potential safety hazard is reduced. In this embodiment, the heating device is not only arranged in the lithium supplementing vacuum cavity 20, but also arranged in the solid lithium liquefying device 40, so that the safety of each cavity is fully ensured or the waste of lithium is avoided as much as possible, the utilization rate of lithium is further improved, and the safety of the whole device is ensured.
Meanwhile, the lithium supplementing vacuum cavity 20 and the solid lithium liquefying device 40 are respectively connected with the lithium recycling unit through pipelines, and the liquid lithium obtained after the lithium layers on the inner walls of the cavities are heated possibly needs to be reused after being treated.
According to the technical scheme provided by the embodiment of the application, the first liquid lithium pool 201 is provided with the first detection component 204 for detecting the liquid level height, and the first detection component 204 is used for detecting the liquid level height of the liquid lithium in the first liquid lithium pool 201, so that the sufficiency of a lithium source can be ensured, and the evaporation effect can be ensured. In addition, in some preferred embodiments of the present application, the second liquid lithium bath 431 is also provided with a detecting part for detecting a liquid level, and a cover plate capable of opening and closing is provided above both the first liquid lithium bath 201 and the second liquid lithium bath 431; therefore, the liquid level of the liquid lithium pools is monitored and maintained through the arrangement of the detection components, so that the liquid level in the liquid lithium pools is kept in a required height range, the distance between the liquid level of the first liquid lithium pool 201 and the strip (pole piece) can be kept unchanged, and the evaporation process can be controlled through the cover plate 205; therefore, the problem that the uniformity of the lithium film on the surface of the strip is affected due to the fact that the evaporation liquid level is reduced and the lithium source is continuously consumed after liquefaction can be relieved, the uniformity of lithium supplement can be ensured, and the quality of a film-coated product is improved.
As shown in fig. 2, in some embodiments, the solid-state lithium liquefying device 40 includes a feeding chamber 401, a vacuum chamber 402, and a lithium source liquefying vacuum chamber 403 (disposed along the material flow direction) disposed in sequence, the vacuum chamber 402 and the lithium source liquefying vacuum chamber 403 are respectively connected to the vacuumizing device 60, the second liquid lithium pool 431 and the second heating device 432 are both disposed in the lithium source liquefying vacuum chamber 403, and the second heating device 432 is configured to heat the lithium layer deposited on the inner wall of the lithium source liquefying vacuum chamber 403. The charging chamber 401 may be used to charge solid lithium sources, for example, by manually charging lithium sources into the charging chamber 401. The solid lithium source is then transferred into the vacuum chamber 402, and the vacuum chamber 402 may serve as a transition, temporary storage, or pretreatment; if the vacuum chamber 402 can be evacuated, the vacuum chamber 402 can be used for transition, temporary storage, or the lithium source can be pre-treated, e.g., atmospheric contamination or other contaminants on the surface of the lithium source can be evacuated, and the lithium source can be brought to a desired vacuum level before entering the lithium source liquefaction vacuum chamber 403. The solid lithium source is then transferred into the lithium source liquefaction vacuum chamber 403 and input into the second liquid lithium reservoir 431 where it is heated under vacuum to liquefy.
In some embodiments, a cover plate (not shown in the drawings) is disposed in the lithium source liquefying vacuum chamber 403, and the cover plate is openable and closable and disposed above the second liquid lithium pool 431, and may be connected to the controller, and the controller may be used to control the opening or closing of the cover plate, so as to protect the second liquid lithium pool 431 before the solid lithium source is put into the feeding chamber 401, and may close the cover plate above the second liquid lithium pool 431, so as to prevent the lithium source in the second liquid lithium pool 431 from evaporating after heating. As for the specific implementation of opening or closing the cover plate, reference may be made to the related art, which is not limited in this embodiment.
In this embodiment, the vacuum degree of the vacuum chamber 402 may be consistent with the vacuum degree of the lithium source liquefying vacuum chamber 403. It should be appreciated that the above-described feed chamber 401, vacuum chamber 402, and lithium source liquefaction vacuum chamber 403 are in communication with each other so that the solid lithium source can be transferred from the feed chamber 401 to the vacuum chamber 402 and then from the vacuum chamber 402 to the lithium source liquefaction vacuum chamber 403.
Alternatively, the evacuation device 60 may include a vacuum pump stack, which may include one or more vacuum pumps. In this embodiment, the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20, the reeling vacuum chamber 30, the vacuum chamber 402 and the lithium source liquefying vacuum chamber 403 may be connected with each vacuum pump set through vacuum pipes, and each chamber is vacuumized by the vacuum pump set. Through making each cavity such as unreeling vacuum chamber 10, benefit lithium vacuum chamber 20, rolling vacuum chamber 30, lithium source liquefaction vacuum chamber 403 etc. be connected with each evacuating device 60 respectively, can realize the individual control to the vacuum degree of each cavity, conveniently regulate and control the vacuum degree of every transition unit cavity respectively, convenient operation.
In some embodiments, a lithium transfer unit 411 is disposed in the solid lithium liquefying device 40, and the lithium transfer unit 411 is configured to transfer a lithium source disposed in the feeding chamber 401 to the vacuum chamber 402 for vacuum treatment, and then to the lithium source liquefying vacuum chamber 403, and into the second liquid lithium pool 431.
Alternatively, the lithium transfer unit 411 includes a conveyor belt 4111 and a driving mechanism 4112 for driving the movement of the conveyor belt 4111. Alternatively, the drive mechanism 4112 may include a motor set; in addition, in other embodiments, other types of driving mechanisms may be used, which are not limited in this embodiment.
By the arrangement of the lithium transfer unit 411, it is possible to realize that the solid lithium source is transferred from the charging chamber 401 to the vacuum chamber 402 and then from the vacuum chamber 402 to the lithium source liquefying vacuum chamber 403. The conveying mode of the conveying belt is adopted, the structure is simple, the cost is low, and the operation is easy.
In some embodiments, seals 404 are provided between the dosing chamber 401 and the vacuum chamber 402, and between the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403. Alternatively, the seal 404 may be a sealing valve train. The sealing valve group can ensure that the tightness between the feeding chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefying vacuum chamber 403 is good, and the sealing valve group is easy to realize and convenient to operate.
For the solid lithium liquefying device 40, when solid lithium sources are conveyed from the feeding chamber 401, the vacuum chamber 402 to the lithium source liquefying vacuum chamber 403 in sequence, a sealing valve group can be opened, so that the solid lithium sources can be conveyed from chamber to chamber; and through the arrangement of the sealing valve group, the sealing performance among the chambers can be ensured in the conveying process.
Therefore, the sealing member 404 can enhance the sealing performance between the chambers, ensure the vacuum environment of the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403, and has simple structure and good overall sealing performance.
When solid lithium source is conveyed into the lithium source liquefaction vacuum chamber 403, the lithium source can be manually thrown into the material throwing chamber 401 and placed on the conveyor belt 4111, and the driving mechanism 4112 such as a conveying power unit can drive the conveyor belt 4111 to move so as to convey the solid lithium source to the vacuum chamber 402 for vacuum treatment; the sealing valve group can ensure perfect tightness between the feeding chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefying vacuum chamber 403. Then, the solid lithium source is transferred into the lithium source liquefaction vacuum chamber 403, the cover plate is opened, so that the solid lithium source is transferred into the second liquid lithium pool 431, and after the solid lithium source replenishment is completed, the cover plate is closed. Thus, when the liquid level in the first liquid lithium pool 201 drops by a certain height, the third valve group 931 is opened, so that the liquid lithium in the second liquid lithium pool 431 can be transferred to the first liquid lithium pool 201 through the conduit 930, and when the predetermined height is reached, the third valve group 931 is closed, and then the solid lithium source is transferred to the second liquid lithium pool 431 of the lithium source liquefaction vacuum chamber 403. Therefore, the lithium source can be supplemented at any time, the sufficiency of the lithium source is ensured, the lithium source is not required to be supplemented in a vacuum breaking and heavy vacuumizing mode, the production efficiency is improved, the problems of evaporation liquid level reduction and influence on uniformity of lithium films on the surface of the strip caused by continuous consumption after the liquefaction of the lithium source can be solved, and the evaporation effect is ensured.
In some embodiments, second liquid lithium pool 431 is provided with a second detecting component 434 for detecting a liquid level. Alternatively, the second detecting member 434 may be a liquid level sensor or a liquid level sensor, etc., and the specific type of the second detecting member 434 is not limited in this embodiment, as long as it can be used to detect or sense a change in the lithium liquid level in the lithium pool. In addition, the second detecting component 434 and the first detecting component 204 may be respectively in signal connection with a controller in the lithium supplementing device.
In order to monitor the lithium liquid level of the second liquid lithium pool 431, the present embodiment further provides a second detecting component 434, and the second detecting component 434 is used to monitor the lithium liquid level of the second liquid lithium pool 431 in real time, when the lithium liquid level of the second liquid lithium pool 431 drops to a certain height, liquid lithium can be conveyed into the first liquid lithium pool 201, and meanwhile, a solid lithium source is put into the second liquid lithium pool 431. Therefore, the liquid level height of each liquid lithium pool can be monitored and maintained, the distance between the liquid level of the liquid lithium pool and the pole piece is kept unchanged, and the lithium plating uniformity is ensured.
In some embodiments, the lithium-replenishing vacuum chamber 20 is provided with a third heating means 203 for heating the lithium source in the first liquid lithium reservoir 201. The lithium supplementing vacuum chamber 20 is provided with a first heating device 202 for heating the inner wall of the lithium supplementing vacuum chamber, and a third heating device 203 for heating a lithium source in the first liquid lithium pool 201. By the arrangement of the third heating means 203, it is possible to heat the lithium source in the first liquid lithium reservoir 201 to maintain the temperature of the liquid lithium, and it is also possible to heat the liquid lithium to vaporize it, so that vaporized lithium is deposited on the pole piece 80 to form a lithium layer.
In some embodiments, solid state lithium liquefaction device 40 is provided with fourth heating device 433 for heating the lithium source in second liquid lithium reservoir 431. The lithium source liquefying vacuum chamber 403 in the solid lithium liquefying device 40 is provided with not only a second heating device 432 for heating the inner wall thereof, but also a fourth heating device 433 for heating the lithium source in the second liquid lithium pool 431. By the arrangement of the fourth heating device 433, it can be used to heat the solid lithium source in the second liquid lithium pool 431 so that the solid lithium source liquefies to form liquid lithium.
Optionally, the first heating device 202 is disposed on an inner wall of the lithium-compensating vacuum chamber 20; the third heating device 203 is disposed in the lithium supplementing vacuum chamber 20 and below the first liquid lithium pool 201. Optionally, the second heating device 432 is disposed on the inner wall of the lithium source liquefaction vacuum chamber 403; the fourth heating device 433 is disposed in the lithium source liquefaction vacuum chamber 403 and below the second liquid lithium pool 431.
Alternatively, the first heating device 202, the second heating device 432, the third heating device 203, and the fourth heating device 433 may be heat induction heating devices, respectively. The first heating device 202, the second heating device 432, the third heating device 203, and the fourth heating device 433 may have the same structure or type, or may have different structures or types. In addition, the first heating device 202, the second heating device 432, the third heating device 203, and the fourth heating device 433 may employ conventional or modified structures that can be used for heating in the related art, which is not limited in this embodiment.
In some embodiments, a cover 205 is disposed in the lithium supplementing vacuum chamber 20, and the cover 205 is disposed above the first liquid lithium pool 201 in a openable and closable manner, so as to protect the pole piece strip 80 located on the surface of the cooling roller 206 before the cooling roller 206 is not started. In this embodiment, a cover 205 is disposed above the first liquid lithium pool 201, and the cover 205 can be opened or closed, for example, when the pole piece 80 is subjected to lithium supplementing operation, the cover 205 can be opened, so that vaporized lithium is deposited on the pole piece 80 to form a lithium layer; when the lithium replenishment is completed or nearly completed, the lithium replenishment vacuum chamber 20 is in a vacuum and high temperature state, the cover plate 205 above the first liquid lithium pool 201 can be closed to prevent evaporation of liquid lithium, and the pole piece 80 is still suspended between the unreeling vacuum chamber 10 and the reeling vacuum chamber 30, otherwise, the logically true empty state (needing threading) of the lithium replenishment vacuum chamber 20 cannot be realized, and a new pole roll is replaced. Therefore, the cover plate 205 can be used for controlling the evaporation process, and has the advantages of simple structure, convenient operation and lower cost.
Alternatively, the cover 205 may be connected to a controller, and the controller may be used to control the opening or closing of the cover 205. As for the specific implementation of opening or closing the cover plate, reference may be made to the related art, which is not limited in this embodiment.
In some embodiments, the lithium recovery unit includes a first lithium recovery bin 51 and a second lithium recovery bin 52, the lithium replenishment vacuum chamber 20 is connected to the first lithium recovery bin 51 by a first recovery pipe 910, and the solid state lithium liquefaction device 40 is connected to the second lithium recovery bin 52 by a second recovery pipe 920.
In this embodiment, a first lithium recovery bin 51 may be disposed on one side of the lithium supplementing vacuum cavity 20, and the lithium supplementing vacuum cavity 20 is connected to the first lithium recovery bin 51 through a first recovery pipe 910, for example, one or more outlets may be disposed at the bottom end of the lithium supplementing vacuum cavity 20, in this embodiment, two outlets are disposed, and are communicated with the first lithium recovery bin 51 through the outlets and the first recovery pipe 910. A second lithium recovery bin 52 may be disposed on one side of the solid-state lithium liquefaction device 40, and the lithium source liquefaction vacuum chamber 403 in the solid-state lithium liquefaction device 40 is connected to the second lithium recovery bin 52 through a second recovery pipe 920, for example, one or more outlets may be disposed at the bottom end of the lithium source liquefaction vacuum chamber 403, in this embodiment, two outlets are connected to the second lithium recovery bin 52 through the outlets and the second recovery pipe 920. In this way, the arrangement is convenient, the independent operation is easy, the lithium films attached to the inner wall of the lithium supplementing vacuum cavity 20 can be liquefied respectively, the liquefied lithium is recovered through the first recovery pipe 910 and the first lithium recovery bin 51 which are connected with the lithium films, the lithium films attached to the inner wall of the lithium source liquefying vacuum cavity 403 are liquefied, and the liquefied lithium is recovered through the second recovery pipe 920 and the second lithium recovery bin 52 which are connected with the lithium films.
In some embodiments, a first valve group 911 is provided on the first recovery pipe 910; and/or a second valve group 921 is provided on the second recovery pipe 920; and/or, a third valve group 931 is provided on the conduit 930.
In this embodiment, the valve groups are disposed on each connecting pipe, so that the valve groups on the connecting pipe can be opened when the chambers are required to be communicated, or the valve groups on the connecting pipe can be closed when the chambers are not required to be communicated. Specifically, when the lithium source is transferred from the second liquid lithium cell 431 to the first liquid lithium cell 201, the third valve group 931 may be opened to allow the second liquid lithium cell 431 to communicate with the first liquid lithium cell 201 through the conduit 930; when the liquid level in the first liquid lithium cell 201 satisfies the required height, the third valve group 931 may be closed to stop the supply of the lithium source in the second liquid lithium cell 431 to the first liquid lithium cell 201. When the liquid lithium on the inner wall of the lithium supplementing vacuum cavity 20 needs to be recovered, the first valve group 911 can be opened, so that the liquid lithium can be carried out into the first lithium recovery bin 51 through the first recovery pipe 910; when it is desired to recover lithium on the inner wall of the lithium source liquefaction vacuum chamber 403, the second valve group 921 may be opened to allow liquid lithium to proceed into the second lithium recovery bin 52 through the second recovery pipe 920; and vice versa, the first valve group 911 or the second valve group 921 can be closed.
Alternatively, the first valve group 911, the second valve group 921, and the third valve group 931 may include control valves, such as electric control valves, which may be connected to a controller. Thus, when it is desired to open or close the first valve group 911, the second valve group 921, or the third valve group 931, the respective valves may be automatically opened or closed by the control of the controller.
The first valve group 911, the second valve group 921, and the third valve group 931 may each include one or more valves, preferably two or more valves, and the specific number of the valves may be selected according to the actual requirements.
In some embodiments, the unreeling vacuum chamber 10 and the reeling vacuum chamber 30 are provided with rollers for winding the pole piece 80, the lithium supplementing vacuum chamber 20 is provided with cooling rollers 206 matched with the rollers, and the cooling rollers 206 are provided with cooling devices.
Optionally, an unreeling roller 101 for winding the pole piece 80 is arranged in the unreeling vacuum cavity 10, and a reeling roller 301 for winding the pole piece 80 after lithium plating is arranged in the reeling vacuum cavity 30. Optionally, roller sets 207 are disposed between the unreeling roller 101 and the cooling roller 206, and between the cooling roller 206 and the reeling roller 301, so that smooth transportation of the pole piece is facilitated.
Optionally, valves 70 are disposed between the unreeling vacuum chamber 10 and the lithium supplementing vacuum chamber 20 and between the lithium supplementing vacuum chamber 20 and the reeling vacuum chamber 30, that is, valves 70 are disposed at the connection positions of the lithium supplementing vacuum chamber 20 and the unreeling vacuum chamber 10 and the reeling vacuum chamber 30, so that the valves 70 can be closed when the pole reel is replaced, and the vacuum degree of the lithium supplementing vacuum chamber 20 is ensured to be unchanged. Like this, through setting up to put a roll vacuum chamber 10, mend lithium vacuum chamber 20 and rolling vacuum chamber 30, can put pole piece unreeling mechanism, plating lithium generating mechanism and pole piece rolling mechanism in independent cavity respectively, when changing the pole piece book, seal the junction of mending lithium vacuum chamber 20 and unreeling vacuum chamber 10, seal the junction of mending lithium vacuum chamber 20 and rolling vacuum chamber 30, can be independent broken vacuum and change the pole piece book, help improving the efficiency of changing the pole piece book.
As shown in fig. 3, the present application may also double-sided lithium replenishment of the tab 80. When double-sided lithium supplementing is performed, two cooling rollers may be provided, for example, the cooling rollers include a first cooling roller 261 and a second cooling roller 262, and the arrangement modes of the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20 and the reeling vacuum chamber 30 are slightly different from those of single-sided lithium supplementing. Optionally, a winding vacuum cavity 30 is disposed between the first cooling roller 261 and the second cooling roller 262, and a winding roller 301 is disposed in the winding vacuum cavity 30. Optionally, two first liquid lithium pools 201 are disposed in the lithium supplementing vacuum cavity 20, and the two first liquid lithium pools 201 are respectively located below the first cooling roller 261 and the second cooling roller 262. One cover plate 205 may be provided over each of the two first liquid lithium cells 201. Two first liquid lithium pools 201 may be connected to solid lithium liquefaction plant 40 via conduit 930 and third valve set 931, respectively. Alternatively, one first lithium recovery bin 51 may be provided, and the outlets below the two first liquid lithium pools 201 are commonly communicated with the first lithium recovery bin 51. Alternatively, two first lithium recovery bins 51 may be provided, the two first lithium recovery bins 51 being respectively communicated with outlets under the two first liquid lithium pools 201.
The double-sided lithium supplementing method can be that the pole piece 80 released by the unreeling roller 101 in the unreeling vacuum cavity 10 enters the first cooling roller 261 after passing through the roller group, the first cooling roller 261 is abutted with the first surface of the pole piece 80, and the liquid lithium is vaporized above one of the first liquid lithium pools 201 of the lithium supplementing vacuum cavity 20 and then deposited on the second surface of the pole piece 80 so as to form a lithium layer on the second surface of the pole piece 80; the pole piece 80 from the first cooling roller 261 enters the second cooling roller 262 after passing through the roller group, the second cooling roller 262 is abutted with the second surface of the pole piece 80, and the liquid lithium is vaporized and deposited on the first surface of the pole piece 80 above the other first liquid lithium pool 201 of the lithium supplementing vacuum cavity 20, so that a lithium layer is deposited on the first surface of the pole piece 80, and double-sided lithium supplementing of the pole piece 80 can be realized; the pole piece 80 from the second cooling roller 262 passes through the roller group and then enters the winding roller 301 in the winding vacuum cavity 30 for winding.
In some embodiments, a pole piece lithium supplementing method is provided, the pole piece lithium supplementing method adopts the aforementioned pole piece lithium supplementing device, and the lithium supplementing method includes:
heating and melting the solid lithium source in the solid lithium liquefying device 40 into liquid lithium;
delivering liquid lithium in second liquid lithium cell 431 to first liquid lithium cell 201 via conduit 930; detecting the liquid level in the first liquid lithium pool 201 by using the first detection component 204, and closing the third valve group 931 on the guide pipe 930 after the liquid level reaches a preset height to stop conveying liquid lithium into the first liquid lithium pool 201;
In a vacuum environment, conveying the pole piece 80 to the upper part of the first liquid lithium pool 201, and vaporizing the liquid lithium in the first liquid lithium pool 201 to enable the lithium to be vaporized and deposited on the pole piece 80;
After the lithium supplementing of the pole piece 80 is completed, the lithium layers deposited on the inner wall of the lithium supplementing vacuum cavity 20 and the inner wall of the solid lithium liquefying device 40 are heated by the first heating device 202 and the second heating device 432 respectively, so that recovered liquid lithium is obtained, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
It should be understood that the pole piece lithium supplementing method and the pole piece lithium supplementing device according to the present embodiment are based on the same inventive concept, so that the pole piece lithium supplementing device has at least all the features and advantages of the pole piece lithium supplementing device, and will not be described herein. In the pole piece lithium supplementing method, the structure and the connection arrangement of the device can be referred to the description of the pole piece lithium supplementing device.
In some embodiments, during the lithium replenishment process, lithium is deposited onto pole piece 80, opening cover plate 205 over first liquid lithium reservoir 201; after the lithium addition of the pole piece 80 is completed, the cover plate 205 located above the first liquid lithium pool 201 is closed to prevent evaporation of liquid lithium.
In some embodiments, the first detection component 204 is utilized to detect the liquid level in the first liquid lithium pool 201, when the liquid level is reduced to 3mm-8mm, the third valve group 931 can be opened, liquid lithium is automatically conveyed into the first liquid lithium pool 201, after the lithium source is replenished, the third valve group 931 is closed, and then the solid lithium source is conveyed into the second liquid lithium pool 431.
In some embodiments, the liquid level of liquid lithium in the first liquid lithium cell 201 is 8mm-12mm. In some embodiments, the liquid level of liquid lithium in the first liquid lithium cell 201 is 9mm-11mm. In some embodiments, the liquid level of liquid lithium in the first liquid lithium cell 201 is 10mm.
In some specific embodiments, the pole piece lithium supplementing method comprises the following steps:
The three steps of unreeling, lithium supplementing and reeling are divided into three cavities, namely an unreeling vacuum cavity 10, a lithium supplementing vacuum cavity 20 and a reeling vacuum cavity 30, and valves 70 are arranged between the unreeling vacuum cavity 10 and the lithium supplementing vacuum cavity 20 and between the lithium supplementing vacuum cavity 20 and the reeling vacuum cavity 30, namely, the valves 70 are arranged at the joints of the lithium supplementing vacuum cavity 20, the unreeling vacuum cavity 10 and the reeling vacuum cavity 30, so that the valves 70 can be closed when the polar roll is replaced, and the vacuum degree of the lithium supplementing vacuum cavity 20 is ensured to be unchanged.
After the unreeling roller 101 of the unreeling vacuum chamber 10 is used for placing the pole reel, horizontally transiting to the roller group 207 of the lithium supplementing vacuum chamber 20, then to the cooling roller 206, and then to the reeling roller 301 of the reeling vacuum chamber 30 for reeling; after the fixation is finished, vacuumizing is started; after the chambers are closed, the vacuum devices 60 can be used for respectively vacuumizing the chambers, and the vacuum degrees of the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20 and the reeling vacuum chamber 30 respectively need to reach about 1 multiplied by 10 -2Pa、5×10-4Pa、1×10-2 Pa.
And then the tape can be started to run, so that the equipment can be operated, and lithium layers with different thicknesses can be deposited according to different tape speeds.
The cover plate is opened first, solid lithium is conveyed into the second liquid lithium pool 431 through the feeding chamber 401, and after the solid lithium is replenished, the cover plate is closed and heated to liquefy the solid lithium. When the vacuum pumping is performed, the independent solid lithium liquefying device 40 can be started, the third heating device 203 and the fourth heating device 433 heat the lithium source to about 180 ℃, after the vacuum degree is reached, the automatic valve (the third valve group 931) can be opened, the lithium source is conveyed from the second liquid lithium pool 431 to the first liquid lithium pool 201 at the bottom of the lithium supplementing vacuum cavity 20 through the guide pipe 930, and when the first detecting component 204 detects that the liquid level of the first liquid lithium pool 201 is about 10mm through the height sensor, the third valve group 931 is closed.
And then the third heating device 203 is used to heat the liquid lithium in the first liquid lithium pool 201 to about 800 ℃, further vaporize the liquid lithium, and after the liquid lithium is vaporized, the cover plate 205 is opened, and a lithium layer is deposited on the pole piece 80 located right above the first liquid lithium pool 201.
Since lithium vaporization brings about a large amount of heat, lithium needs to be deposited and simultaneously taken away, and a cooling device is arranged on the inner wall of the cooling roller 206 to circulate cooling liquid in the inner wall, so that the cooling temperature is about-20 ℃. The pole piece 80 after lithium supplementation is carried to the winding vacuum cavity 30 and is wound by the winding roller 301.
When all the pole rolls are close to completing lithium supplement, the third heating device 203 needs to be set at 180 ℃, and the tape feeding speed is reduced to 0m/min. Meanwhile, the valves 70 at two sides of the lithium supplementing vacuum cavity 20 are closed, so that the lithium supplementing vacuum cavity 20 is always in a vacuum and high-temperature state, the cover plate 205 above the first liquid lithium pool 201 is closed, evaporation of liquid lithium is prevented, the pole piece 80 is still suspended between the unreeling vacuum cavity 10 and the reeling vacuum cavity 30, otherwise, the logically true vacuum state (needing threading) of lithium supplementing vacuum cannot be realized, and a new pole roll is replaced.
Further, in the pole piece lithium supplementing process, the method also relates to the throwing of a lithium source. Specifically, the solid lithium source may be manually put into the feeding chamber 401 of the independent solid lithium liquefying device 40 and placed on the conveyor belt 4111, and the driving mechanism 4112, such as a power transmission unit, may drive the conveyor belt 4111 to move so as to transfer the solid lithium source to the vacuum chamber 402 for vacuum treatment; the sealing valve group can ensure perfect tightness between the feeding chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefying vacuum chamber 403.
When the first detection part 204 detects that the liquid level in the first liquid lithium pool 201 is reduced to a preset height, such as 3mm-8mm, the third valve group 931 can be opened to automatically convey the lithium source in the second liquid lithium pool 431 to the first liquid lithium pool 201, and after the lithium source replenishment is finished, the third valve group 931 is closed to convey the solid lithium source to the second liquid lithium pool 431.
Further, after the pole piece is supplemented with lithium, the recovery of lithium is also involved. Specifically, when the lithium supplementing production is stopped, all pump sets can be closed, the cleaning of the lithium layer on the inner wall of the deposited chamber is started, the cooling cycle of the cooling roller 206 is closed, the first valve set 911 and the second valve set 921 are opened, and meanwhile, the first heating device 202 and the second heating device 432 are opened, so that the inner walls of the lithium supplementing vacuum chamber 20 and the lithium source liquefying vacuum chamber 403 are heated to about 200 ℃, the lithium film attached to the inner walls of the lithium supplementing vacuum chamber 20 and the lithium source liquefying vacuum chamber 403 are liquefied, and the liquid lithium flows into the first recovery pipe 910 below the first liquid lithium pool 201 and the second recovery pipe 920 below the second liquid lithium pool 431, so that the liquid lithium can flow into the first lithium recovery bin 51 and the second lithium recovery bin 52 respectively, and the recovery and the reutilization of the lithium are realized. In addition, after the first lithium recovery bin 51 and the second lithium recovery bin 52 collect lithium, the recovered lithium source can be purified again, so that the recycling of the lithium source is realized, and the utilization rate of the lithium source is further improved.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, the term "and/or" as used herein is merely one association relationship describing the associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims (11)

1. The pole piece lithium supplementing device is characterized by comprising an unreeling vacuum cavity, a lithium supplementing vacuum cavity, a reeling vacuum cavity and a solid lithium liquefying device, wherein the unreeling vacuum cavity, the lithium supplementing vacuum cavity and the reeling vacuum cavity are arranged along the material flowing direction;
the solid lithium liquefying device comprises a feeding chamber, a vacuum chamber and a lithium source liquefying vacuum chamber which are sequentially arranged, and the vacuum chamber and the lithium source liquefying vacuum chamber are respectively connected with the vacuumizing device;
The lithium supplementing vacuum cavity is provided with a first liquid lithium pool and a first heating device, the solid lithium liquefying device is provided with a second liquid lithium pool, the second liquid lithium pool is connected with the first liquid lithium pool through a guide pipe, the first heating device is configured to heat a lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity, and the first liquid lithium pool is provided with a first detection component for detecting the liquid level; the second liquid lithium pool is provided with a second detection component for detecting the liquid level;
A cover plate is arranged in the lithium supplementing vacuum cavity, and the cover plate can be opened and closed and is arranged above the first liquid lithium pool; a cover plate is arranged in the lithium source liquefaction vacuum chamber, and the cover plate can be opened and closed and is arranged above the second liquid lithium pool;
The lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recovery unit through pipelines.
2. The pole piece lithium supplementing device according to claim 1, wherein a lithium transmission unit is arranged in the solid lithium liquefying device, and the lithium transmission unit is used for transmitting a lithium source placed in the feeding chamber to the vacuum chamber for vacuum treatment and then to the lithium source liquefying vacuum chamber.
3. The pole piece lithium supplementing device according to claim 2, wherein the lithium transmission unit comprises a conveyor belt and a driving mechanism for driving the conveyor belt to move;
and/or sealing elements are arranged between the feeding chamber and the vacuum chamber and between the vacuum chamber and the lithium source liquefying vacuum chamber.
4. The pole piece lithium replenishment device of claim 1, wherein the solid state lithium liquefaction device is further provided with a second heating device, the second liquid state lithium pool and the second heating device are both located within the lithium source liquefaction vacuum chamber, the second heating device is configured to heat a lithium layer deposited on an inner wall of the lithium source liquefaction vacuum chamber.
5. The pole piece lithium supplementing device of claim 1, wherein the lithium recovery unit comprises a first lithium recovery bin and a second lithium recovery bin, the lithium supplementing vacuum cavity is connected with the first lithium recovery bin through a first recovery pipe, and the solid lithium liquefying device is connected with the second lithium recovery bin through a second recovery pipe.
6. The pole piece lithium supplementing device according to claim 5, wherein a first valve group is arranged on the first recovery pipe;
And/or a second valve group is arranged on the second recovery pipe;
and/or a third valve group is arranged on the conduit.
7. The pole piece lithium-supplementing device according to any of the claims 1-6, wherein the lithium-supplementing vacuum chamber is provided with a third heating means for heating the lithium source in the first liquid lithium pool; and/or the number of the groups of groups,
The solid-state lithium liquefying device is provided with a fourth heating device for heating the lithium source in the second liquid lithium pool.
8. The lithium supplementing device for pole pieces according to any one of claims 1 to 6, wherein a winding roller for winding the pole pieces is arranged in each of the unreeling vacuum chamber and the reeling vacuum chamber, a cooling roller matched with the winding roller is arranged in the lithium supplementing vacuum chamber, and the cooling roller is provided with a cooling device.
9. A pole piece lithium supplementing method, characterized in that the pole piece lithium supplementing device as claimed in any one of claims 1-8 is adopted, and the lithium supplementing method comprises the following steps:
heating and melting a solid lithium source in a solid lithium liquefying device into liquid lithium;
conveying liquid lithium in a second liquid lithium pool in the solid lithium liquefying device to the first liquid lithium pool through a guide pipe; detecting the liquid level in the first liquid lithium pool by using the first detection component, and closing the third valve group when the liquid level reaches a preset height, so as to stop conveying liquid lithium into the first liquid lithium pool;
In a vacuum environment, conveying the pole piece to the upper part of the first liquid lithium pool, and vaporizing the liquid lithium in the first liquid lithium pool so as to enable the lithium to be vaporized and deposited on the pole piece;
After the pole piece lithium supplementing is completed, the first heating device and the second heating device are used for heating the lithium layers deposited on the inner wall of the lithium supplementing vacuum cavity and the inner wall of the solid lithium liquefying device respectively, so that recovered liquid lithium is obtained, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
10. The method of claim 9, wherein the cover plate above the first liquid lithium pool is opened during deposition of lithium onto the pole piece; after the pole piece lithium supplementing is completed, a cover plate positioned above the first liquid lithium pool is closed to prevent evaporation of liquid lithium.
11. The method according to claim 9, wherein the first detecting means detects the liquid level in the first liquid lithium pool, and when the liquid level drops by a predetermined height, liquid lithium is automatically transferred into the first liquid lithium pool, and after the lithium source is replenished, the third valve group is closed, and then the solid lithium source is transferred into the second liquid lithium pool.
CN202211099334.XA 2022-09-08 2022-09-08 Pole piece lithium supplementing device and lithium supplementing method Active CN115305445B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207398276U (en) * 2017-09-21 2018-05-22 中航锂电技术研究院有限公司 A kind of two-sided benefit lithium device of lithium ion battery negative electrode
CN110265623A (en) * 2019-05-28 2019-09-20 合肥国轩高科动力能源有限公司 A kind of pole piece mends lithium device and its mends lithium method
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207398276U (en) * 2017-09-21 2018-05-22 中航锂电技术研究院有限公司 A kind of two-sided benefit lithium device of lithium ion battery negative electrode
CN110265623A (en) * 2019-05-28 2019-09-20 合肥国轩高科动力能源有限公司 A kind of pole piece mends lithium device and its mends lithium method
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

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