CN115305445A - 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
CN115305445A
CN115305445A CN202211099334.XA CN202211099334A CN115305445A CN 115305445 A CN115305445 A CN 115305445A CN 202211099334 A CN202211099334 A CN 202211099334A CN 115305445 A CN115305445 A CN 115305445A
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lithium
liquid
supplementing
pool
pole piece
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CN115305445B (en
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张永胜
丁雷
张永琪
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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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • 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 lithium supplementing method, and belongs to the technical field of lithium supplementing of lithium batteries. A pole piece lithium supplementing device comprises an unreeling vacuum cavity, a lithium supplementing vacuum cavity and a reeling vacuum cavity which are arranged along the material flowing direction, and a solid lithium liquefying device communicated with the lithium supplementing vacuum cavity; 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 conduit, 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 height; the lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recovery unit through pipelines. The invention 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 supplement of lithium batteries, and particularly relates to a lithium pole piece lithium supplement device and a lithium supplement method.
Background
Formation is a process of charging a lithium ion battery for the first time, and during formation of the lithium ion battery, the process mainly comprises the step of charging the battery for the first time after the battery cell completes liquid injection, and the process activates active substances in the battery, so that the lithium ion battery is activated, and the charging and discharging performance, the self-discharging performance, the storage performance and other comprehensive performances of the battery are improved. In the formation process of the lithium ion battery, an electrochemical reaction occurs in the battery, and a passivation thin layer, i.e., a Solid Electrolyte Interface (SEI) film, covering the surface of the carbon electrode is formed on a phase Interface between the negative electrode and the Electrolyte, where the SEI film has Solid Electrolyte properties, but the formation of the SEI film consumes original lithium ions in the battery, thereby causing initial capacity loss, cycle life reduction, rate performance reduction, and the like of the lithium ion battery, and limiting the improvement of the energy density of the lithium ion battery. In view of this, by supplementing lithium elements on the surface of the high-capacity low-first-efficiency negative electrode sheet, the first 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 types of lithium supplement processes for the negative electrode of a lithium ion battery, such as lithium foil supplement, lithium powder supplement, lithium metal negative electrode, and the like. However, the conventional rolling lithium foil technology can only achieve micron (μm) level, is relatively complex and is difficult to control, so that most of the existing evaporation lithium plating methods are adopted to complete lithium supplement operation, and the evaporation lithium plating technology is simpler than a direct compounding method of a lithium foil and a negative electrode, and can ensure lithium supplement uniformity. In addition, the lithium atom film on the inner wall of the device has high purity, and the lithium atom film deposited on the inner wall has to be cleaned by opening a cavity because the active chemical property of the metal lithium can cause the lithium atom film to be easily burnt, but the repeated vacuum breaking and vacuumizing operations not only reduce the production efficiency, but also have great potential safety hazard. Therefore, the existing lithium supplementing device or method for the pole piece still has the need of improvement.
Disclosure of Invention
In view of the above-mentioned problems, the present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the pole piece lithium supplementing device and the pole piece lithium supplementing method provided by the invention can be used for relieving the cleaning problem that part of lithium atoms are deposited on the inner wall of the cavity to form a film in the prior art, improving the production efficiency, ensuring better safety and realizing the recycling of lithium.
In order to solve the technical problem, the present application is implemented as follows:
according to one aspect of the application, a pole piece lithium supplementing device is provided, and 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, and the solid lithium liquefying device is communicated with the lithium supplementing vacuum cavity;
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 conduit, 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 height;
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 liquefaction device comprises a feeding chamber, a vacuum chamber and a lithium source liquefaction vacuum chamber which are arranged in sequence, and the vacuum chamber and the lithium source liquefaction vacuum chamber are respectively connected with a vacuum pumping device.
In some embodiments, a lithium transfer unit is disposed in the solid lithium liquefaction device, and the lithium transfer unit is configured to transfer the lithium source placed in the feeding chamber to the vacuum chamber for vacuum treatment and then to the lithium source liquefaction vacuum chamber.
In some of these embodiments, the lithium transfer unit comprises a conveyor belt and a drive mechanism for driving the conveyor belt in motion.
In some embodiments, a seal is disposed between the charging 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, and the second liquid-state lithium pool and the second heating device are both located within the lithium source liquefaction vacuum chamber.
In some of these embodiments, the second liquid lithium cell is provided with a second detection means for detecting the liquid level.
In some embodiments, a cover plate is disposed in the vacuum chamber, and the cover plate is disposed above the first liquid lithium pool in an openable and closable manner.
In some embodiments, a cover plate is disposed in the vacuum chamber for liquefying lithium source, and the cover plate is disposed 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 chamber 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.
In some embodiments, a first valve set 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 guide pipe.
In some embodiments, the vacuum chamber for lithium supplement is provided with a third heating device for heating the lithium source in the first liquid lithium pool.
In some embodiments, the solid-state lithium liquefaction device is provided with a fourth heating device for heating the lithium source in the second liquid-state lithium cell.
In some embodiments, the unwinding vacuum chamber and the winding vacuum chamber are both provided with winding rollers for winding pole pieces, the lithium supplementing vacuum chamber is provided with a cooling roller matched with the winding rollers, and the cooling roller is provided with a cooling device.
According to another aspect of the present application, there is provided a method for lithium supplement to a pole piece, where the method for lithium supplement adopts the device for lithium supplement to a pole piece as described above, and the method for lithium supplement includes:
heating and melting a solid lithium source in a solid lithium liquefaction device into liquid lithium;
conveying the liquid lithium in a second liquid lithium pool in the solid lithium liquefying device to the first liquid lithium pool through a conduit; detecting the liquid level in the first liquid lithium pool by using a first detection part, closing the third valve group when the liquid level reaches a preset height, and stopping conveying liquid lithium to the first liquid lithium pool;
conveying the pole piece to the upper part of a first liquid lithium pool in a vacuum environment, and vaporizing the liquid lithium in the first liquid lithium pool to evaporate and deposit the lithium on the pole piece;
and after the pole piece is used for supplementing lithium, the first heating device and the second heating device are respectively used for heating the lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity and the inner wall of the solid lithium liquefying device to obtain recovered liquid lithium, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
In some embodiments, in the lithium replenishing method, during the deposition of lithium on the pole piece, the cover plate located above the first liquid lithium pool is opened; and after the pole piece is supplemented with lithium, closing the cover plate positioned above the first liquid lithium pool to prevent the liquid lithium from evaporating.
In some embodiments, in the lithium replenishing method, a first detection component is used to detect a liquid level in a first liquid lithium pool, liquid lithium is automatically delivered into the first liquid lithium pool when the liquid level drops by a preset height, and after the lithium source is replenished, a third valve set is closed, and then the solid lithium source is delivered into a second liquid lithium pool.
In some embodiments, the liquid level of the liquid lithium in the first liquid lithium reservoir is between 8mm and 12mm.
The technical scheme of the invention at least has 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, and the independent solid lithium liquefying device is communicated with the lithium supplementing vacuum cavity. Through making the second liquid lithium pond in the solid-state lithium liquefaction device and supplementing the first liquid lithium pond in the lithium vacuum cavity and being linked together through the pipe, can be with the liquid lithium after the liquefaction in passing through the pipe flow direction first liquid lithium pond by the second liquid lithium pond in the solid-state lithium liquefaction device, when carrying out the pole piece and supplementing lithium operation, need not to open the chamber like this and supply the raw materials, can avoid need broken the vacuum because of supplying the raw materials, the problem that the production efficiency that the vacuum pumping caused reduces again, the operation is simplified, and the production efficiency is improved. And a first heating device capable of heating the lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity is arranged in the lithium supplementing vacuum cavity, so that the inner wall of the cavity can be cleaned after production is finished, the lithium layer on the inner wall of the cavity is liquefied, the cleaning problem that part of lithium atoms are formed into a film on the inner wall of the lithium supplementing vacuum cavity after evaporation coating is solved, the utilization rate of a lithium source is improved, and potential safety hazards are reduced. Meanwhile, the lithium supplementing vacuum cavity and the solid lithium liquefying device are respectively connected with the lithium recovery unit through pipelines, and liquid lithium obtained after heating the lithium layers on the inner walls of the cavities is recycled after treatment, so that the liquid lithium obtained after heating can flow into the lithium recovery unit for recovery, storage or post-treatment through the arrangement of the lithium recovery 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 cell is provided with and is used for detecting the first detection part of liquid level height, detects the height of liquid lithium liquid level in the first liquid lithium cell through first detection part, can guarantee that the lithium source is sufficient, guarantees the coating by vaporization effect, can alleviate the problem that the evaporation liquid level that constantly consumes after the liquefaction of lithium source leads to descends, influences strip surface lithium membrane homogeneity, enables to mend the lithium homogeneity and obtains guaranteeing.
Additional aspects and advantages of the present 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 invention.
Drawings
Fig. 1 is a schematic structural diagram of a lithium supplementing device for a pole piece according to some embodiments of the present invention;
fig. 2 is a schematic structural diagram of a solid-state lithium liquefaction device in a pole piece lithium supplement device according to some embodiments of the present invention;
fig. 3 is a schematic structural diagram of another lithium supplementing device for a pole piece according to some embodiments of the present invention.
Description of reference numerals:
10-unwinding a vacuum cavity; 101-unwinding roller;
20-lithium supplement vacuum cavity; 201-a first liquid lithium cell; 202-a first heating device; 203-third heating means; 204-a first detection component; 205-a cover plate; 206-a chill roll; 261-a first chill roll; 262-a second chill roll; 207-set of rollers;
30-rolling a vacuum cavity; 301-a wind-up roll;
40-a solid lithium liquefaction unit; 401-a feeding chamber; 411 — lithium transfer unit; 4111-a conveyor belt; 4112-a drive mechanism; 402-a vacuum chamber; 403-lithium source liquefaction vacuum chamber; 431-a second liquid lithium cell; 432-a second heating device; 433-a fourth heating device; 434-a second detection component; 404-a seal;
51-a first lithium recovery bin; 52-a second lithium recovery bin; 60-a vacuum-pumping device; 70-a valve; 80-pole piece;
910-a first recovery pipe; 911-first valve set; 920-a second recovery pipe; 921 — second valve group; 930-a catheter; 931-third valve group.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and these ranges or values should be understood to encompass values close to these ranges or values. For numerical ranges, one or more new numerical ranges may be obtained by combining the individual values, or by combining the individual values.
In the related technology, the operation of pole piece lithium supplement is performed by adopting an evaporation lithium plating process, so that the problems of cleanness or safety of lithium layer formed by depositing part of lithium on the inner wall of a chamber and the like exist, and the problems that the lithium source needs to be heated and vaporized by opening a cavity to supplement a new lithium source when the lithium source is used up, so that the environment needs to be vacuumized and cooled, the lithium source can be supplemented, the production efficiency is reduced, new impurities are possibly introduced, and the lithium atom film is polluted exist. In addition, the lithium device is mended to current pole piece, along with the consumption gradually of lithium source, the distance of lithium source apart from the pole piece is bigger and bigger, will lead to the homogeneity of lithium layer thickness to receive the influence, can't guarantee process efficiency.
In view of this, the technical scheme of the embodiment of the present application provides an improved pole piece lithium supplement device and a pole piece lithium supplement method. The technical scheme of the embodiment of the application can relieve the cleaning problem or the safety problem caused by the film formation of redundant lithium atoms on the inner wall of the chamber after the evaporation coating, and achieves the purposes of improving the utilization rate of lithium, recycling the lithium and reducing potential safety hazards; the problem of reduction of production efficiency caused by the fact that vacuum breaking and vacuum re-pumping are needed for supplementing raw materials after the lithium source is used can be solved, and the purposes of simplifying operation flow and improving production efficiency are achieved; the problems that the evaporation liquid level is reduced and the uniformity of a lithium film on the surface of a strip is affected due to continuous consumption of the liquefied lithium source can be solved, and the purposes of ensuring the sufficiency of the lithium source, ensuring the evaporation effect and improving the uniformity of lithium supplement are achieved. See below for a description of specific embodiments.
Referring to fig. 1 to 3, in some embodiments, a pole piece lithium supplement device is provided, which includes an unreeling vacuum chamber 10, a lithium supplement vacuum chamber 20, a reeling vacuum chamber 30, and a solid lithium liquefying device 40 connected to the lithium supplement vacuum chamber 20.
The unreeling vacuum chamber 10 is used for unreeling a pole piece 80 coiled material to the lithium supplement vacuum chamber 20, the lithium supplement vacuum chamber 20 is used for performing lithium supplement operation on the pole piece 80 coiled material, and the reeling vacuum chamber 30 is used for reeling the pole piece 80 after lithium supplement through the lithium supplement vacuum chamber 20; the solid lithium liquefying device 40 may be independently disposed, and the solid lithium liquefying device 40 is communicated with the lithium replenishing vacuum chamber 20, and may be configured to replenish a lithium source, liquefy the solid lithium source to form liquid lithium, and transport the liquid lithium into the lithium replenishing vacuum chamber 20.
Optionally, the lithium supplementing vacuum cavity can supplement lithium to the pole piece on a single surface or on two surfaces. As shown in fig. 1, in the present embodiment, the vacuum chamber 20 can perform single-sided lithium supplement on the pole piece 80. As shown in fig. 3, the vacuum chamber 20 for lithium supplement can perform double-sided lithium supplement on the electrode plate 80, and the process and arrangement for double-sided lithium supplement are described in the following section. As shown in fig. 1, when lithium is replenished on one side, one cooling roller 206 may be provided, and the unwinding vacuum chamber 10, the lithium replenishing vacuum chamber 20, and the winding vacuum chamber 30 may be sequentially provided. The way of single-sided lithium supplement can be that the pole piece 80 released by the unwinding roller 101 in the unwinding vacuum chamber 10 passes through the roller set 207 and then enters the cooling roller 206, the cooling roller 206 is abutted against one side of the pole piece 80, and in the lithium supplement vacuum chamber 20, liquid lithium is vaporized and then deposited on the other side surface of the pole piece 80 so as to form a lithium layer on one side surface of the pole piece 80; the pole piece 80 coming out of the cooling roller 206 passes through the roller set 207 and then enters the winding roller 301 in the winding vacuum chamber 30 for winding.
It should be understood that the lithium supplementing device and method for the pole piece of the present embodiment are mainly illustrated by taking a single-sided lithium supplementing manner as an example, and double-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 is further 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. Therefore, the unreeling vacuum cavity 10, the lithium supplementing vacuum cavity 20 and the reeling vacuum cavity 30 are conveniently and respectively vacuumized, the vacuum degree of each cavity can be independently controlled, and the lithium supplementing vacuum cavity is convenient to operate and easy to control.
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 chamber 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 to 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 chamber 20, the second heating device 432 is configured to heat the lithium layer deposited on the 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 height.
Optionally, the first detecting component 204 may be a height sensor or a liquid level sensor, and the specific type of the first detecting component 204 is not limited in this embodiment as long as it can be used for detecting the level of the lithium liquid in the lithium battery. In addition, the pole piece lithium supplement device can be provided with a controller, and the first detection component 204 can be in signal connection with the controller. The controller may be any controller known in the related art, and the specific structure and operation principle of the controller may be described in the prior art, which is not limited in this embodiment and will not be described in detail herein.
In this embodiment, the lithium replenishing vacuum chamber 20 and the solid lithium liquefying device 40 are respectively connected to the lithium recovery unit through a pipeline. For example, the lithium replenishing vacuum chamber 20 and the solid lithium liquefying device 40 may be connected to the lithium recovery unit through two pipelines, respectively; alternatively, the vacuum chamber 20 for lithium replenishment is connected to one lithium recovery unit through one pipe, and the solid lithium liquefying device 40 is connected to the other lithium recovery unit through the other pipe.
When the pole piece lithium supplementing device works, the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20 and the reeling vacuum chamber 30 can be respectively vacuumized until the required vacuum degree is reached, the pole piece 80 can be unreeled into the pole piece lithium supplementing vacuum chamber 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 chamber 20 through the conduit 930, the liquid level height of the lithium source in the first liquid lithium pool 201 is detected by the first detection component 204, the conveying of the lithium source can be stopped when the preset height is reached, the cover plate 205 positioned above the first liquid lithium pool 201 is opened, in the process, the lithium source is ensured to be sufficient, the liquid lithium in the first liquid lithium pool 201 is further heated to be vaporized, and the lithium is evaporated on one side surface of the electrode pole piece bearing electrode active materials by the evaporating lithium source under the vacuum condition to form an evaporated lithium layer. After the vacuum deposition is completed, the cover plate 205 is closed, and at this time, the first heating device 202 and the second heating device 432 may be opened to liquefy the lithium film attached to the inner walls of the lithium replenishing vacuum chamber 20 and the solid lithium liquefying device 40, and the recovered lithium may be flowed into the lithium recovery unit through the pipeline to recover and reuse the lithium.
Therefore, according to the technical scheme provided by the embodiment of the application, the additional independent solid lithium liquefying device 40 is adopted, the second liquid lithium pool 431 in the solid lithium liquefying device 40 is communicated with the first liquid lithium pool 201 in the lithium supplementing vacuum cavity 20 through the conduit 930, and liquefied liquid lithium can flow into the first liquid lithium pool 201 from the second liquid lithium pool 431 through the conduit 930, so that when the lithium supplementing operation of the pole piece 80 is carried out, the cavity does not need to be opened to supplement raw materials, the problem of reduction of the production efficiency caused by vacuum breaking and vacuum re-pumping of the supplemented raw materials after the lithium source is used can be 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 capable of heating the lithium layer deposited on the inner wall of the lithium supplementing vacuum chamber 20 is arranged in the lithium supplementing vacuum chamber 20, and the second heating device 432 capable of heating the lithium layer deposited on the inner wall of the solid lithium liquefying device 40 is arranged in the solid lithium liquefying device 40, so that the inner wall of the chamber can be cleaned when the pole roll is replaced, for example, the first heating device 202 and the second heating device 432 can be respectively used for heating the inner wall of each chamber, so that the lithium film attached to the inner wall of each chamber is liquefied, the cleaning problem that part of lithium atoms are formed into films on the inner walls of the lithium supplementing vacuum chamber 20 and the solid lithium liquefying device 40 after evaporation and film coating is solved, the utilization rate of a lithium source is improved, and potential safety hazards are reduced. In the embodiment, the heating device is arranged in the lithium supplementing vacuum cavity 20 and 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 vacuum lithium supplementing cavity 20 and the solid lithium liquefying device 40 are respectively connected with the lithium recovery unit through pipelines, liquid lithium obtained after heating the lithium layers on the inner walls of the cavities may need to be processed and reused, and in order to ensure the quality reliability of the lithium atom thin film plated on the pole piece 80, the liquid lithium obtained after heating can flow into the lithium recovery unit for recovery, storage or further post-processing through the arrangement of the lithium recovery unit, liquefied lithium is recovered, the recycling of lithium can be realized, the utilization rate of lithium resources is improved, the waste of lithium is reduced or avoided, and the cost is reduced.
According to the technical scheme that this application embodiment provided, first liquid lithium cell 201 is provided with and is used for detecting the first detection part 204 of liquid level height, detects the height of liquid lithium liquid level in first liquid lithium cell 201 through first detection part 204, can guarantee that the lithium source is sufficient, guarantees the coating by vaporization effect. In addition, in some preferred embodiments of the present application, the second liquid lithium pool 431 is also provided with a detection component for detecting a liquid level, and a cover plate capable of opening and closing is provided above both the first liquid lithium pool 201 and the second liquid lithium pool 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 each liquid lithium pool is kept in a required height range, the distance between the liquid level of the first liquid lithium pool 201 and a strip (pole piece) is kept unchanged, and the evaporation process can be controlled through the cover plate 205; therefore, the problems that the evaporation liquid level is reduced and the uniformity of a lithium film on the surface of a strip is influenced due to continuous consumption of a lithium source after liquefaction can be solved, 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 lithium liquefaction device 40 includes a feeding chamber 401, a vacuum chamber 402 and a lithium source liquefaction vacuum chamber 403 which are arranged in sequence (arranged along the material flow direction), the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403 are respectively connected with the vacuum pumping device 60, a second liquid lithium pool 431 and a second heating device 432 are both positioned in the lithium source liquefaction vacuum chamber 403, and the second heating device 432 is configured to heat a lithium layer deposited on the inner wall of the lithium source liquefaction vacuum chamber 403. The above-described dosing chamber 401 may be used for dosing a solid lithium source, for example by manually dosing the lithium source in the dosing chamber 401. The solid-state lithium source is then transported into the vacuum chamber 402, where the vacuum chamber 402 may function as a transition, temporary storage, or pre-treatment; vacuum chamber 402 may be evacuated, vacuum chamber 402 may be used for transition, temporary storage, or the lithium source may be pretreated, such as to evacuate atmospheric or other contaminants from the surface of the lithium source, and to achieve a desired vacuum before entering lithium source liquefaction vacuum chamber 403. Then, the solid lithium source is transported into the lithium source liquefaction vacuum chamber 403 and is input into the second liquid lithium cell 431, and the solid lithium source is liquefied by heating in a vacuum environment.
In some embodiments, a cover plate (not shown) is disposed inside the lithium source liquefaction vacuum chamber 403, and the cover plate is disposed above the second liquid lithium pool 431 and can be connected to the controller, and the controller can control the opening and closing of the cover plate to protect the second liquid lithium pool 431 before the solid lithium source is put into the feeding chamber 401, and can close the cover plate above the second liquid lithium pool 431 to prevent the lithium source in the second liquid lithium pool 431 from evaporating after heating. As to a specific implementation manner of opening or closing the cover, reference may be made to the related art, and this embodiment is not limited thereto.
In this embodiment, the vacuum degree of the vacuum chamber 402 may be kept to be equal to that of the lithium source liquefaction vacuum chamber 403. It should be understood that the charging chamber 401, vacuum chamber 402, and lithium source liquefaction vacuum chamber 403 are in communication with one another so that solid lithium source can be transferred from charging chamber 401 to vacuum chamber 402 and from vacuum chamber 402 to lithium source liquefaction vacuum chamber 403.
Alternatively, the evacuation device 60 may include a vacuum pump set, 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 liquefaction vacuum chamber 403 may be respectively connected to each vacuum pump unit through vacuum tubes, and each vacuum pump unit is used to respectively evacuate each chamber. Through making each cavity be connected with each evacuating device 60 respectively such as unreeling vacuum cavity 10, mend lithium vacuum cavity 20, rolling vacuum cavity 30, lithium source liquefaction vacuum cavity 403, can realize the independent 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 liquefaction device 40, and the lithium transfer unit 411 is configured to transfer the lithium source disposed in the feeding chamber 401 to the vacuum chamber 402 for vacuum treatment, and then to the lithium source liquefaction vacuum chamber 403, and enter the second liquid lithium pool 431.
Alternatively, the lithium transfer unit 411 includes a conveyor 4111 and a driving mechanism 4112 for driving the conveyor 4111 to move. Optionally, the driving mechanism 4112 may include a motor set; in addition, in other embodiments, other types of driving mechanisms may also be adopted, and this embodiment is not limited to this.
Through the arrangement of the lithium transfer unit 411, the solid lithium source can be transferred from the feeding chamber 401 to the vacuum chamber 402, and then transferred from the vacuum chamber 402 to the lithium source liquefaction 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 disposed between charging chamber 401 and vacuum chamber 402, and between vacuum chamber 402 and lithium source liquefaction vacuum chamber 403. Alternatively, the seal 404 may be a sealing valve set. The sealing valve group can ensure that the sealing performance between the feeding chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403 is good, and the sealing valve group is easy to realize and convenient to operate.
For the solid lithium liquefaction device 40, when the solid lithium source is conveyed from the feeding chamber 401 and the vacuum chamber 402 to the lithium source liquefaction vacuum chamber 403 in sequence, the sealing valve group can be opened, so that the solid lithium source can be conveyed from each chamber to each other; and, through the setting of sealing valve group, in the process of the transmission, also can guarantee the leakproofness between each cavity.
Therefore, in the present embodiment, by providing the sealing member 404, the sealing performance between the chambers can be enhanced, the vacuum environment of the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403 can be ensured, the structure is simple, and the overall sealing performance of the device is good.
When the solid-state lithium source is conveyed into the lithium source liquefaction vacuum chamber 403, the lithium source can be manually put into the feeding chamber 401 and placed on the conveyor belt 4111, and the driving mechanism 4112, such as a conveying motor set, can drive the conveyor belt 4111 to move so as to convey the solid-state lithium source into the vacuum chamber 402 for vacuum treatment; the sealing valve sets can ensure that the sealing performance between the charging chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403 is good. Then, the solid lithium source is transported into the lithium source liquefaction vacuum chamber 403, the cover plate is opened, so that the solid lithium source is transported into the second liquid lithium pool 431, and after the solid lithium source is replenished, the cover plate is closed. Thus, when the liquid level in the first liquid lithium cell 201 is lowered by a certain height, the liquid lithium in the second liquid lithium cell 431 can be transferred to the first liquid lithium cell 201 through the conduit 930 by opening the third valve group 931, and when the predetermined height is reached, the solid lithium source is transferred to the second liquid lithium cell 431 of the lithium source liquefaction vacuum chamber 403 by closing the third valve group 931. Therefore, the lithium source can be supplemented at any time, the lithium source is sufficient, the lithium source is not required to be supplemented again in a vacuum breaking and re-vacuumizing mode, the production efficiency is improved, the problems that the evaporation liquid level is reduced and the uniformity of a lithium film on the surface of a strip is influenced due to continuous consumption after the lithium source is liquefied can be solved, and the evaporation effect is ensured.
In some embodiments, the second liquid lithium cell 431 is provided with a second detection part 434 for detecting a liquid level height. Alternatively, the second detecting component 434 may be a liquid level sensor or a liquid level sensor, and the specific type of the second detecting component 434 is not limited in this embodiment as long as it can be used for detecting or sensing the change of the liquid level of the lithium in the lithium battery. In addition, the second detecting unit 434 and the first detecting unit 204 may be respectively connected to the controller in the lithium replenishing apparatus by signals.
In order to monitor the lithium liquid level of the second liquid lithium cell 431, the embodiment further provides a second detecting component 434, the second detecting component 434 is used for monitoring the lithium liquid level of the second liquid lithium cell 431 in real time, and when the lithium liquid level of the second liquid lithium cell 431 drops to a certain height, liquid lithium can be delivered into the first liquid lithium cell 201, and a solid lithium source can be put into the second liquid lithium cell 431. Therefore, the liquid level height of each liquid lithium pool can be monitored and maintained, the distance between the liquid level of each liquid lithium pool and the pole piece is guaranteed to be unchanged, and the uniformity of lithium plating is guaranteed.
In some embodiments, the vacuum chamber 20 for replenishing lithium is provided with a third heating device 203 for heating the lithium source in the first liquid lithium cell 201. The lithium supplementing vacuum cavity 20 is provided with not only a first heating device 202 for heating the inner wall thereof, but also a third heating device 203 for heating the lithium source in the first liquid lithium pool 201. The third heating device 203 is configured to heat the lithium source in the first liquid lithium pool 201 to maintain the temperature of the liquid lithium, and also to heat the liquid lithium to vaporize the liquid lithium, so that the vaporized lithium is deposited on the pole piece 80 to form a lithium layer.
In some embodiments, the solid lithium liquefying device 40 is provided with a fourth heating device 433 for heating the lithium source in the second liquid lithium pool 431. The lithium source liquefaction vacuum chamber 403 in the solid lithium liquefaction device 40 is provided therein with not only the 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. The fourth heating device 433 is configured to heat the solid lithium source in the second liquid lithium pool 431, so that the solid lithium source is liquefied to form liquid lithium.
Optionally, the first heating device 202 is disposed on an inner wall of the lithium supplement vacuum chamber 20; the third heating device 203 is disposed in the 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 below the second liquid lithium pool 431.
Alternatively, the first heating means 202, the second heating means 432, the third heating means 203 and the fourth heating means 433 may be heat induction heating means, respectively. The first heating device 202, the second heating device 432, the third heating device 203 and the fourth heating device 433 may be of the same structure or type, or of 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 adopt a conventional or improved structure that can be used for heating in the related art, and the embodiment is not limited thereto.
In some embodiments, a cover plate 205 is disposed in the vacuum chamber 20, and the cover plate 205 is disposed above the first liquid lithium pool 201 in an openable and closable manner for protecting the pole piece strip 80 on the surface of the cooling roller 206 before the cooling roller 206 is started. In this embodiment, a cover plate 205 is disposed above the first liquid lithium pool 201, and the cover plate 205 can be opened or closed, for example, when the pole piece 80 is subjected to lithium supplement operation, the cover plate 205 can be opened, so that vaporized lithium is deposited on the pole piece 80 to form a lithium layer; after the lithium supplement is completed or is close to being completed, the lithium supplement 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, the evaporation of the liquid lithium is prevented, at this time, the pole piece 80 is still suspended between the unreeling vacuum chamber 10 and the reeling vacuum chamber 30, otherwise, the constant vacuum state (needing to be threaded) of the lithium supplement 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 is simple in structure, convenient to operate and low in cost.
Alternatively, the cover 205 may be connected to a controller, and the controller may be used to control the opening and closing of the cover 205. As to a specific implementation manner of opening or closing the cover, reference may be made to the related art, and this embodiment is not limited thereto.
In some embodiments, the lithium recycling unit comprises a first lithium recycling bin 51 and a second lithium recycling bin 52, the lithium supplementing vacuum chamber 20 is connected with the first lithium recycling bin 51 through a first recycling pipe 910, and the solid lithium liquefying device 40 is connected with the second lithium recycling bin 52 through a second recycling pipe 920.
In this embodiment, a first lithium recycling bin 51 may be disposed at one side of the lithium supplementing vacuum chamber 20, the lithium supplementing vacuum chamber 20 is connected to the first lithium recycling bin 51 through a first recycling pipe 910, for example, the bottom end of the lithium supplementing vacuum chamber 20 may be provided with one or more outlets, in this embodiment, the two outlets are connected to the first lithium recycling bin 51 through the outlets and the first recycling pipe 910. A second lithium recovery bin 52 may be disposed at one side of the solid lithium liquefaction device 40, and the lithium source liquefaction vacuum chamber 403 in the solid 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 disposed, and are communicated with the second lithium recovery bin 52 through the outlets and the second recovery pipe 920. In this way, the arrangement is convenient, the operation is easy, and the lithium film attached to the inner wall of the lithium replenishing vacuum chamber 20 can be liquefied, the liquefied lithium can be recovered through the first recovery pipe 910 and the first lithium recovery bin 51 connected thereto, the lithium film attached to the inner wall of the lithium source liquefaction vacuum chamber 403 can be liquefied, and the liquefied lithium can be recovered through the second recovery pipe 920 and the second lithium recovery bin 52 connected thereto.
In some embodiments, a first valve set 911 is disposed on the first recycling pipe 910; and/or a second valve group 921 is arranged on the second recovery pipe 920; and/or, a third valve assembly 931 may be disposed on conduit 930.
The valve group is arranged on each connecting pipe, so that the valve group on the connecting pipe can be opened when the chambers are required to be communicated, or the valve group on the connecting pipe can be closed when the chambers are not required to be communicated. Specifically, when the lithium source is delivered from the second liquid lithium cell 431 to the first liquid lithium cell 201, the third valve group 931 may be opened to communicate the second liquid lithium cell 431 with the first liquid lithium cell 201 through the conduit 930; when the liquid level in the first liquid lithium pool 201 meets the required level, the third valve set 931 may be closed to stop the lithium source in the second liquid lithium pool 431 from being delivered into the first liquid lithium pool 201. When the liquid lithium on the inner wall of the lithium supplementing vacuum chamber 20 needs to be recovered, the first valve set 911 may be opened, so that the liquid lithium is transported into the first lithium recovering bin 51 through the first recovering pipe 910; when lithium on the inner wall of the lithium source liquefaction vacuum chamber 403 needs to be recovered, the second valve set 921 can be opened, so that liquid lithium can be sent into the second lithium recovery bin 52 through the second recovery pipe 920; otherwise, the first valve set 911 or the second valve set 921 may be closed.
Optionally, the first valve set 911, the second valve set 921 and the third valve set 931 may include control valves, such as electrically controlled valves, which may be connected with a controller. Thus, when the first valve set 911, the second valve set 921 or the third valve set 931 needs to be opened or closed, the valves can be automatically opened or closed under the control of the controller.
The first valve set 911, the second valve set 921 and the third valve set 931 may respectively include one or more valves, preferably two or more valves are provided, and the specific number of the valves may be selected and set according to actual requirements.
In some embodiments, a winding roller for winding the pole piece 80 is disposed in each of the unwinding vacuum chamber 10 and the winding vacuum chamber 30, a cooling roller 206 matched with the winding roller is disposed in the lithium supplement vacuum chamber 20, and the cooling roller 206 is provided with a cooling device.
Optionally, an unwinding roller 101 for winding the pole piece 80 is arranged in the unwinding vacuum chamber 10, and a winding roller 301 for winding the lithium-plated pole piece 80 is arranged in the winding vacuum chamber 30. Optionally, roller sets 207 are arranged between the unwinding roller 101 and the cooling roller 206 and between the cooling roller 206 and the winding roller 301, so that smooth transportation of pole pieces is facilitated.
Optionally, valves 70 are respectively disposed between the unwinding vacuum chamber 10 and the lithium supplementing vacuum chamber 20 and between the lithium supplementing vacuum chamber 20 and the winding vacuum chamber 30, that is, the valves 70 are respectively disposed at the joints of the lithium supplementing vacuum chamber 20, the unwinding vacuum chamber 10 and the winding vacuum chamber 30, so that the valves 70 can be closed when the pole roll is replaced, and the vacuum degree of the lithium supplementing vacuum chamber 20 is ensured to be unchanged. Therefore, the unwinding vacuum cavity 10, the lithium supplementing vacuum cavity 20 and the winding vacuum cavity 30 are arranged, the pole piece unwinding mechanism, the lithium plating generation mechanism and the pole piece winding mechanism can be respectively placed in the independent cavities, when a pole piece roll is replaced, the connection position of the lithium supplementing vacuum cavity 20 and the unwinding vacuum cavity 10 is sealed, the connection position of the lithium supplementing vacuum cavity 20 and the winding vacuum cavity 30 is sealed, the pole piece roll can be replaced through independent vacuum breaking, and the efficiency of replacing the pole piece roll is improved.
As shown in fig. 3, the present application can also perform double-sided lithium supplement on the pole piece 80. When double-sided lithium supplement 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 layout of the unreeling vacuum chamber 10, the lithium supplement vacuum chamber 20 and the reeling vacuum chamber 30 is slightly different from that of single-sided lithium supplement. Optionally, a winding vacuum chamber 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 chamber 30. Optionally, two first liquid lithium pools 201 are disposed in the lithium supplementing vacuum chamber 20, and the two first liquid lithium pools 201 are respectively located below the first cooling roller 261 and the second cooling roller 262. A cover plate 205 may be disposed above each of the two first liquid lithium cells 201. The two first liquid lithium cells 201 may be connected to the solid-state lithium liquefaction device 40 through conduits 930 and a third valve group 931, respectively. Alternatively, a first lithium recovery bin 51 may be provided, and the outlets below the two first liquid lithium batteries 201 are communicated with the first lithium recovery bin 51 together. Alternatively, two first lithium recovery bins 51 may be provided, and the two first lithium recovery bins 51 are respectively communicated with outlets below the two first liquid lithium cells 201.
The way of double-sided lithium supplement can be that the pole piece 80 released by the unwinding roller 101 in the unwinding vacuum chamber 10 enters a first cooling roller 261 after passing through a roller set, the first cooling roller 261 is abutted against the first surface of the pole piece 80, and liquid lithium is vaporized and deposited on the second surface of the pole piece 80 above one of the first liquid lithium pools 201 of the lithium supplement vacuum chamber 20 so as to form a lithium layer on the second surface of the pole piece 80; the pole piece 80 coming out of the first cooling roller 261 enters the second cooling roller 262 after passing through the roller set, the second cooling roller 262 is abutted against the second surface of the pole piece 80, and liquid lithium is deposited on the first surface of the pole piece 80 after being vaporized above the other first liquid lithium pool 201 of the lithium supplement vacuum cavity 20 so as to form a lithium layer on the first surface of the pole piece 80, so that double-sided lithium supplement of the pole piece 80 can be realized; the pole piece 80 coming out of the second cooling roller 262 passes through the roller set and then enters the winding roller 301 in the winding vacuum chamber 30 for winding.
In some embodiments, a method for pole piece lithium supplement is provided, where the method for pole piece lithium supplement adopts the aforementioned device for pole piece lithium supplement, and the method for lithium supplement includes:
heating and melting the solid lithium source in the solid lithium liquefying device 40 into liquid lithium;
delivering the liquid lithium in the second liquid lithium pool 431 to the first liquid lithium pool 201 through a conduit 930; detecting the liquid level in the first liquid lithium reservoir 201 by the first detecting unit 204, and closing the third valve group 931 on the duct 930 to stop the liquid lithium being delivered into the first liquid lithium reservoir 201 when the liquid level reaches a preset level;
conveying the pole piece 80 to the upper part of the first liquid lithium pool 201 in a vacuum environment, and vaporizing the liquid lithium in the first liquid lithium pool 201 to enable the lithium to be evaporated and deposited on the pole piece 80;
after the pole piece 80 completes lithium supplement, the first heating device 202 and the second heating device 432 are respectively used for heating and depositing lithium layers on the inner wall of the lithium supplement vacuum cavity 20 and the inner wall of the solid lithium liquefying device 40 to obtain recovered liquid lithium, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
It should be understood that the method for pole piece lithium supplement and the device for pole piece lithium supplement of the present embodiment are based on the same inventive concept, and therefore have at least all the features and advantages of the device for pole piece lithium supplement, and are not described herein again. In the method for pole piece lithium supplement, the structure of the device and the connection arrangement thereof can refer to the description of the pole piece lithium supplement device.
In some embodiments, in the lithium replenishment method, during the deposition of lithium onto the pole piece 80, the cover plate 205 located above the first liquid lithium pool 201 is opened; after the pole piece 80 is completed with lithium supplement, the cover plate 205 located above the first liquid lithium pool 201 is closed to prevent the liquid lithium from evaporating.
In some embodiments, the liquid level in the first liquid lithium pool 201 is detected by the first detection component 204, and when the liquid level drops to a preset level, such as 3mm to 8mm, the third valve set 931 may be opened to automatically deliver liquid lithium to the first liquid lithium pool 201, and after the lithium supply is completed, the third valve set 931 is closed to deliver the solid lithium to the second liquid lithium pool 431.
In some embodiments, the liquid level of the liquid lithium in the first liquid lithium reservoir 201 is 8mm to 12mm. In some embodiments, the liquid level of the liquid lithium in the first liquid lithium reservoir 201 is between 9mm and 11mm. In some embodiments, the level of liquid lithium in the first pool of liquid lithium 201 is 10mm.
In some specific embodiments, the method for supplementing lithium to a pole piece comprises the following steps:
the three operations 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 meanwhile, valves 70 are respectively 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 respectively 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 pole rolls are replaced, and the vacuum degree of the lithium supplementing vacuum cavity 20 is ensured to be unchanged.
After the pole coil is placed on the unwinding roller 101 of the unwinding vacuum chamber 10, the horizontal transition is carried out to supplementThe roller set 207 of the lithium vacuum cavity 20 is wound on the cooling roller 206 and then on the winding roller 301 of the winding vacuum cavity 30; vacuumizing after fixing; after the chambers are closed, the vacuum pumping devices 60 can be used for respectively pumping the chambers, and the vacuum degrees of the unreeling vacuum chamber 10, the lithium supplementing vacuum chamber 20 and the reeling vacuum chamber 30 need to reach about 1 × 10 -2 Pa、5×10 -4 Pa、1×10 -2 Pa。
The transport can then be started and the apparatus operated to deposit lithium layers of different thickness depending on the transport speed.
The cover plate is opened first, the solid lithium is conveyed to the second liquid lithium pool 431 through the feeding chamber 401, and after the supplement of the solid lithium is finished, the cover plate is closed and heated to be liquefied. The independent solid lithium liquefying device 40 can be started during vacuumizing, the third heating device 203 and the fourth heating device 433 heat the lithium source to about 180 ℃, the automatic valve (the third valve group 931) can be started after the vacuum degree is reached, the lithium source is conveyed into the first liquid lithium pool 201 at the bottom of the lithium supplementing vacuum cavity 20 from the second liquid lithium pool 431 through the conduit 930, and the third valve group 931 is closed when the first detection component 204 such as a height sensor detects that the liquid level of the first liquid lithium pool 201 is about 10mm.
And then, heating the liquid lithium in the first liquid lithium pool 201 to about 800 ℃ by using the third heating device 203, further vaporizing the liquid lithium, and after the liquid lithium is vaporized, opening the cover plate 205 to deposit a lithium layer on the pole piece 80 positioned right above the first liquid lithium pool 201.
Because lithium vaporization can bring a large amount of heat, the heat is taken away when lithium is deposited, and a cooling device is arranged on the inner wall of the cooling roller 206, so that cooling liquid circulates on the inner wall, and the cooling temperature is ensured to be about-20 ℃. The pole piece 80 after lithium supplement is carried to the winding vacuum cavity 30, and is wound by the winding roller 301.
When all the pole rolls are close to finish lithium supplement, the third heating device 203 needs to be set to 180 ℃, and the tape conveying speed is reduced to 0m/min. Meanwhile, the valves 70 on the two sides of the lithium supplementing vacuum cavity 20 are closed to enable the lithium supplementing vacuum cavity 20 to be in a vacuum and high-temperature state all the time, the cover plate 205 above the first liquid lithium pool 201 is closed to prevent the liquid lithium from evaporating, the pole piece 80 is still suspended between the unreeling vacuum cavity 10 and the reeling vacuum cavity 30, and otherwise, a constant vacuum state (needing threading) of lithium supplementing vacuum cannot be achieved, and a new pole roll is replaced.
Further, in the process of lithium supplement of the pole piece, the feeding of a lithium source is also involved. Specifically, the solid-state lithium source can be manually fed into the feeding chamber 401 of the independent solid-state lithium liquefying device 40 and placed on the conveyor 4111, and the driving mechanism 4112, such as a conveying motor set, can drive the conveyor 4111 to move so as to convey the solid-state lithium source to the vacuum chamber 402 for vacuum treatment; the sealing valve sets can ensure that the sealing performance between the charging chamber 401 and the vacuum chamber 402 and between the vacuum chamber 402 and the lithium source liquefaction vacuum chamber 403 is perfect.
When the first detection component 204 detects that the liquid level in the first liquid lithium pool 201 drops to a preset height, such as 3mm-8mm, the third valve group 931 may be opened, the lithium source in the second liquid lithium pool 431 may be automatically transported into the first liquid lithium pool 201, after the lithium source is completely replenished, the third valve group 931 may be closed, and then the solid lithium source may be transported into the second liquid lithium pool 431.
Furthermore, after the pole piece is completed with lithium supplement, the recovery of lithium is also involved. Specifically, when the lithium supplement production is stopped, all pump groups can be closed, the lithium layer on the inner wall of the deposited chamber starts to be cleaned, the cooling cycle of the cooling roller 206 is closed, the first valve group 911 and the second valve group 921 are opened, and the first heating device 202 and the second heating device 432 are simultaneously opened, so that the inner walls of the lithium supplement vacuum chamber 20 and the lithium source liquefaction vacuum chamber 403 are heated to about 200 ℃, so as to liquefy the lithium film attached to the inner walls thereof, 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, that is, the liquid lithium can respectively flow into the first lithium recovery bin 51 and the second lithium recovery bin 52, so that the lithium can be recovered and reused. In addition, after the first lithium recovery bin 51 and the second lithium recovery bin 52 finish lithium collection, 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 of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. Further, the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (14)

1. A pole piece lithium supplement device is characterized by comprising an unreeling vacuum cavity, a lithium supplement vacuum cavity and a reeling vacuum cavity which are arranged along the material flowing direction, and a solid lithium liquefying device communicated with the lithium supplement vacuum cavity;
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 conduit, 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 height;
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 of claim 1, wherein the solid lithium liquefying device comprises a feeding chamber, a vacuum chamber and a lithium source liquefying vacuum chamber which are arranged in sequence, and the vacuum chamber and the lithium source liquefying vacuum chamber are respectively connected with a vacuumizing device.
3. The pole piece lithium supplementing device of claim 2, wherein a lithium transmission unit is arranged in the solid lithium liquefying device, and the lithium transmission unit is used for transmitting the lithium source placed in the feeding chamber to the vacuum chamber for vacuum treatment and then to the lithium source liquefying vacuum chamber.
4. The pole piece lithium supplementing device according to claim 3, wherein the lithium transmission unit comprises a conveyor belt and a driving mechanism for driving the conveyor belt to move;
and/or sealing pieces are arranged between the feeding chamber and the vacuum chamber and between the vacuum chamber and the lithium source liquefaction vacuum chamber.
5. The pole piece lithium supplementing device according to claim 2, wherein the solid lithium liquefying device is further provided with a second heating device, the second liquid lithium pool and the second heating device are both located in the lithium source liquefying vacuum chamber, and the second heating device is configured to heat a lithium layer deposited on the inner wall of the lithium source liquefying vacuum chamber.
6. The pole piece lithium supplementing device according to claim 5, wherein a cover plate is arranged in the lithium supplementing vacuum cavity, and the cover plate is arranged above the first liquid lithium pool in an openable and closable manner; and/or the presence of a gas in the atmosphere,
and a cover plate is arranged in the lithium source liquefaction vacuum cavity and can be opened and closed and is arranged above the second liquid lithium pool.
7. The pole piece lithium supplementing device according to claim 5, wherein the second liquid lithium pool is provided with a second detection part for detecting liquid level.
8. The pole piece lithium supplementing device according to claim 1, wherein the lithium recovering unit comprises a first lithium recovering bin and a second lithium recovering bin, the lithium supplementing vacuum cavity is connected with the first lithium recovering bin through a first recovering pipe, and the solid lithium liquefying device is connected with the second lithium recovering bin through a second recovering pipe.
9. The pole piece lithium supplementing device according to claim 8, 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.
10. The pole piece lithium supplementing device according to any one of claims 1 to 9, wherein the lithium supplementing vacuum cavity is provided with a third heating device for heating a lithium source in the first liquid lithium pool; and/or the presence of a gas in the gas,
the solid-state lithium liquefaction device is provided with a fourth heating device for heating the lithium source in the second liquid-state lithium pool.
11. The pole piece lithium supplementing device according to any one of claims 1 to 9, wherein winding rollers for winding the pole piece are arranged in the unwinding vacuum chamber and the winding vacuum chamber, a cooling roller matched with the winding rollers is arranged in the lithium supplementing vacuum chamber, and the cooling roller is provided with a cooling device.
12. A method for supplementing lithium to a pole piece, wherein the method for supplementing lithium adopts the device for supplementing lithium to a pole piece according to any one of claims 1 to 11, and the method for supplementing lithium comprises the following steps:
heating and melting a solid lithium source in a solid lithium liquefying device into liquid lithium;
conveying the liquid lithium in a second liquid lithium pool in the solid lithium liquefying device to the first liquid lithium pool through a conduit; detecting the liquid level in the first liquid lithium pool by using a first detection part, closing the third valve group when the liquid level reaches a preset height, and stopping conveying liquid lithium to the first liquid lithium pool;
conveying the pole piece to the upper part of a first liquid lithium pool in a vacuum environment, and vaporizing the liquid lithium in the first liquid lithium pool to evaporate and deposit the lithium on the pole piece;
and after the pole piece is used for supplementing lithium, the first heating device and the second heating device are respectively used for heating the lithium layer deposited on the inner wall of the lithium supplementing vacuum cavity and the inner wall of the solid lithium liquefying device to obtain recovered liquid lithium, and the recovered liquid lithium flows into the lithium recovery unit through a pipeline.
13. The pole piece lithium supplementing method according to claim 12, wherein in the lithium supplementing method, a cover plate located above a first liquid lithium pool is opened in the process of depositing lithium to the pole piece; and after the pole piece is supplemented with lithium, closing a cover plate positioned above the first liquid lithium pool to prevent the liquid lithium from evaporating.
14. The pole piece lithium supplementing method according to claim 12, wherein in the lithium supplementing method, a first detection part is used for detecting the liquid level in the first liquid lithium pool, when the liquid level is lowered by a preset height, liquid lithium is automatically conveyed into the first liquid lithium pool, after the lithium source is supplemented, the third valve group is closed, and then the solid lithium source is conveyed 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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