CN111774195A - Lithium device is mended to negative pole piece lithium powder - Google Patents
Lithium device is mended to negative pole piece lithium powder Download PDFInfo
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- CN111774195A CN111774195A CN202010579980.0A CN202010579980A CN111774195A CN 111774195 A CN111774195 A CN 111774195A CN 202010579980 A CN202010579980 A CN 202010579980A CN 111774195 A CN111774195 A CN 111774195A
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- lithium
- pole piece
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- collecting roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/081—Plant for applying liquids or other fluent materials to objects specially adapted for treating particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/0419—Methods of deposition of the material involving spraying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- 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
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
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- 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
Abstract
The invention provides a lithium supplementing device for lithium powder of a negative pole piece, which comprises an electrostatic lithium supplementing mechanism, wherein the electrostatic lithium supplementing mechanism comprises an electrostatic generating assembly, a plurality of spraying needle tubes, a slurry pump, an electrostatic collecting roller and a lithium powder slurry supplying assembly, the electrostatic collecting roller and the spraying assembly are oppositely arranged and are respectively positioned on two sides of the pole piece in the conveying direction, the electrostatic collecting roller is grounded, the electrostatic generating assembly is used for enabling lithium powder sprayed to the pole piece by the spraying needle tubes to be negatively charged, the spraying assembly comprises a plurality of spraying needle tubes, the spraying needle tubes are arranged at intervals in the width direction of the pole piece, the spraying needle tubes are all vertically directed to the pole piece, the lithium powder slurry supplying assembly and the slurry pump are communicated through a pipeline, and the slurry pump is respectively communicated with the spraying needle tubes through a pipeline. According to the invention, the pole piece can be subjected to pre-lithiation through the matching of the static electricity generation assembly, the static electricity collection roller and the injection assembly, and the number of the injection needle tubes is adjusted according to the actual width of the pole piece, so that the pre-lithiation is more uniform.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium supplementing device for lithium powder of a negative pole piece.
Background
Currently, lithium ion secondary batteries are widely used in the market with high cell energy density and the number of possible uses. When used as a power battery, energy density is an important performance requirement. At present, the use of high nickel ternary positive electrode materials and silicon negative electrode materials is an important development direction for lithium ion battery developers to improve the energy density of the batteries. Compared with graphite cathode materials, silicon cathode materials consume a large amount of lithium ions for forming an SEI film during the first charge of a battery, which is equivalent to the content of lithium ions in the consumed cathode materials, thereby reducing the capacity of the battery. Therefore, the lithium is supplemented to the silicon cathode or Si-C cathode material containing silicon in advance, which has an important promotion effect on the capacity of the battery.
The lithium supplement of the negative electrode is the prelithiation of the negative electrode, does not have mature equipment and high production cost, and is a main problem for limiting the difficulty of achieving industrialized production of the prelithiation process. The methods for supplementing lithium to the negative electrode are various, and mainly comprise electrochemical lithium supplementation, lithium foil rolling lithium supplementation, vacuum lithium plating, metal lithium powder and the like. The stable lithium supplement of the lithium powder is one of the earliest lithium supplement methods, is usually manufactured by using a pre-laboratory and a miniaturized experimental battery, has simple operation and obvious effect, and can complete the pre-lithiation only by scattering the lithium powder on the surface of a pole piece. However, in industrial application, the lithium powder directly used is easy to fly upward, and the safety problem is easy to occur. Therefore, a specific method and a specific device are needed for lithium supplement, for example, patent application No. 201210237240.4 discloses a method for lithium supplement of a negative plate by directly depositing lithium powder by using an electric field, which can complete lithium supplement, but only one lithium powder feeding port is difficult to be uniform in an electric field environment, lithium powder deposition needs a long time to reach the negative plate, the efficiency is poor, and the floating lithium powder is more prone to fire and explosion.
Further, as disclosed in the patent application No. 201811193753.3, a separator for lithium supplement of silicon-carbon negative electrode is composed of metallic lithium powder, a binder and a lithium ion battery separator, and although the first efficiency of the battery is improved after the separator is used, the thickness of the separator is usually very thin, the lithium powder is easy to penetrate the separator when being directly deposited on the separator and assembled, and the risk of battery short circuit is caused, and the redundant lithium powder in the edge area cannot be fully utilized.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a lithium supplementing device for negative pole piece lithium powder.
The invention provides a lithium supplementing device for lithium powder of a negative pole piece, which comprises an electrostatic lithium supplementing mechanism, wherein the electrostatic lithium supplementing mechanism comprises an electrostatic generating assembly, a plurality of injection needle tubes, a slurry pump, an electrostatic collecting roller and a lithium powder slurry supply assembly;
the static collecting roller and the spraying assembly are oppositely arranged and are respectively positioned on two sides of the pole piece in the conveying direction, the static collecting roller is grounded, and the static generating assembly is used for enabling the spraying needle tube to spray lithium powder to the pole piece to be negatively charged;
the injection assembly comprises a plurality of injection needle tubes, the injection needle tubes are arranged at intervals along the width direction of the pole piece, the injection needle tubes are all perpendicular to the pole piece, the lithium powder slurry supply assembly and the slurry pump are communicated through a pipeline, and the slurry pump is communicated with the injection needle tubes through a pipeline.
Preferably, the slurry pump is a variable frequency pump.
Preferably, a flow meter is arranged on a pipeline between the variable frequency pump and each injection needle tube.
Preferably, still include two limit baffle and adjust fixed subassembly, two limit baffle along the axial interval arrangement of static collection roller in the static one side of collecting the roller towards the pole piece, two limit baffle and static collection roller sliding fit all are equipped with between two limit baffle and the static collection roller and adjust fixed subassembly, adjust fixed subassembly and be used for making the limiting plate that corresponds along the axial displacement of static collection roller, form the space that is used for the pole piece to pass through between two limit baffle.
Preferably, adjust fixed subassembly and include roll stand and two locking mountings, the static is collected the roller and is rotated and set up on the roll stand, is equipped with the guide arm parallel with the axis of static collection roller on the roll stand, and two limit baffle are fixed on the guide arm through the locking mountings respectively, and the length direction of guide bar can be followed to the junction of limit baffle and guide arm and adjusted.
Preferably, the number of the electrostatic lithium supplementing devices is two, the two electrostatic lithium supplementing devices are arranged at intervals along the conveying direction of the pole piece, and the two electrostatic lithium supplementing devices are respectively used for supplementing lithium to two sides of the pole piece.
Preferably, the lithium ion battery further comprises two drying mechanisms, and the two drying mechanisms are arranged at the downstream of the two electrostatic lithium supplement mechanisms in a one-to-one correspondence manner.
Preferably, the drying mechanism is a hot air drying mechanism.
Preferably, the lithium ion battery pole piece conveying device further comprises an unwinding mechanism, a rolling mechanism and a winding mechanism, wherein the unwinding mechanism, the electrostatic lithium supplement mechanism, the drying mechanism, the rolling mechanism and the winding mechanism are arranged at intervals in sequence along the conveying direction of the pole piece.
The lithium supplementing device for the lithium powder of the negative pole piece provided by the invention has the following beneficial effects:
(1) the assembly and the electrostatic collecting roller are matched to enable lithium powder to be adsorbed on the pole piece through static electricity, lithium supplement is even, the pole piece is grounded through the electrostatic collecting roller to contact the pole piece, the grounding piece is not required to be fixed with the pole lug of the pole piece, the workload is reduced, and the use is more convenient.
(2) Lithium is mended to the pole piece through a plurality of injection needle pipes that set up along the width direction interval of pole piece, and the injection needle pipe makes injection range and injection speed more accurate, can improve the homogeneity of mending lithium.
(3) The pre-lithium injection device can be suitable for pre-lithium of pole pieces of different battery models by adjusting the number of the injection needle tubes.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode plate lithium powder lithium supplement device provided by the invention.
Fig. 2 is a schematic view of the structure of the electrostatic collecting roller in the present invention.
Description of reference numerals:
1-unwinding mechanism 2-winding mechanism 3-electrostatic collecting roller 4-injection needle tube 5-drying mechanism
6-rolling mechanism 7-limit baffle
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Referring to fig. 1, the lithium supplementing device for the lithium powder of the negative electrode plate provided by the invention comprises an electrostatic lithium supplementing mechanism, wherein the electrostatic lithium supplementing mechanism comprises an electrostatic generating assembly, a plurality of injection needle tubes 4, a slurry pump, an electrostatic collecting roller 3 and a lithium powder slurry supply assembly;
the static collecting roller 3 and the spraying assembly are oppositely arranged and are respectively positioned on two sides of the pole piece in the conveying direction, the static collecting roller 3 is grounded, and the static generating assembly is used for enabling the spraying needle tube 4 to spray lithium powder to the pole piece to be negatively charged, so that the negatively charged lithium powder is adsorbed on the pole piece under the action of static force;
the injection assembly comprises a plurality of injection needle tubes 4, the plurality of injection needle tubes 4 are arranged at intervals along the width direction of the pole piece, the plurality of injection needle tubes 4 point to the pole piece vertically, the lithium powder slurry supply assembly and the slurry pump are communicated through a pipeline, and the slurry pump is communicated with the plurality of injection needle tubes 4 through a pipeline.
When the lithium is replenished, the electrostatic collecting roller 3 contacts the pole piece, the pole piece can be grounded through grounding of the electrostatic collecting roller 3, a grounding part is not required to be fixed with a pole lug of the pole piece, the workload is reduced, the use is more convenient, and the electrostatic generating assembly enables the lithium powder sprayed to the pole piece by the spray needle tube 4 to be negatively charged, so that the negatively charged lithium powder is adsorbed on the pole piece due to the action of electrostatic force, and the lithium replenishment is completed; secondly, the pole piece is supplemented with lithium through a plurality of injection needle tubes 4 arranged at intervals in the width direction of the pole piece, the injection needle tubes 4 enable the injection range and the injection speed to be more accurate, the uniformity of lithium supplementation can be improved, and the number of the injection needle tubes 4 can be adjusted to be suitable for pre-lithium of pole pieces of different battery models.
In order to facilitate the adjustment of the supply speed of the lithium powder slurry and to facilitate the control of the thickness of the coating layer of the lithium powder slurry, in the embodiment, the slurry pump is a variable frequency pump.
In order to further accurately control the injection flow rate of the injection needle tubes 4, thereby being convenient for controlling the thickness of the coating layer of the lithium powder slurry, and the lithium is uniform in advance, in the embodiment, a flow meter is arranged on a pipeline between the variable frequency pump and each injection needle tube 4.
Referring to fig. 2, in order to avoid the lithium powder sticking to the foils on the two sides of the pole piece, in this embodiment, the lithium ion battery further comprises two limit baffles 7 and a regulating and fixing assembly, the two limit baffles 7 are arranged on one side of the electrostatic collecting roller 3 facing the pole piece along the axial interval of the electrostatic collecting roller 3, the two limit baffles 7 are in sliding fit with the electrostatic collecting roller 3, the regulating and fixing assembly is arranged between the two limit baffles 7 and the electrostatic collecting roller 3, the regulating and fixing assembly is used for enabling the corresponding limiting plate to move axially along the electrostatic collecting roller 3, and a space for the pole piece to pass through is formed between the two limit baffles 7. Moreover, the position between the two limit baffle plates 7 can be adjusted by adjusting the fixing component, so that the pole pieces with different widths can be suitable.
In order to conveniently adjust the positions of the two limit baffle plates 7, the lithium ion battery is suitable for pole pieces with different widths, and lithium powder is prevented from being adhered to foils on two sides of the pole pieces.
Specifically, the locking fixing piece is a hoop.
In order to supplement lithium to both sides of the pole piece, in the embodiment, two electrostatic lithium supplementing devices are provided, the two electrostatic lithium supplementing devices are arranged at intervals along the conveying direction of the pole piece, and the two electrostatic lithium supplementing devices are respectively used for supplementing lithium to both sides of the pole piece.
In order to volatilize the solvent in the lithium powder slurry on the pole piece, not affect the subsequent steps, and ensure the uniformity of pre-lithium, in the embodiment, the lithium ion battery further comprises two drying mechanisms 5, and the two drying mechanisms 5 are arranged at the downstream of the two electrostatic lithium supplement mechanisms in a one-to-one correspondence manner.
In a further embodiment, the drying mechanism 5 is a hot air drying mechanism. The hot air drying mechanism can further soften the lithium powder while ensuring that the solvent on the pole piece is completely volatilized, so that the lithium powder in the rolling process is crushed on the surface of the lithium powder to complete activation, and the more compact contact negative pole piece is used for completing pre-lithium, so that the surface of the pole piece cannot be damaged.
In order to ensure the continuity of lithium supplement, in this embodiment, the lithium pole piece feeding device further includes an unwinding mechanism 1, a rolling mechanism 6, and a winding mechanism 2, where the unwinding mechanism 1, the electrostatic lithium supplement mechanism, the drying mechanism 5, the rolling mechanism 6, and the winding mechanism 2 are sequentially arranged at intervals along the conveying direction of the pole piece.
The pole piece is unreeled by the unreeling mechanism, is sprayed and pre-lithium is carried out by the electrostatic lithium supplement mechanism on one side of the pole piece, is dried by the drying mechanism 5, is sprayed and pre-lithium is carried out by the electrostatic lithium supplement mechanism on the other side of the pole piece, is dried by the drying mechanism 5, is activated by a composite rolling method, and is finally coiled by the coiling mechanism to finish the pre-lithium of the negative pole piece.
Of course, in this embodiment, a tension and pole piece buffer mechanism for adjusting the operation of the pole piece between the mechanisms is further included.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The lithium supplementing device for the lithium powder of the negative pole piece is characterized by comprising an electrostatic lithium supplementing mechanism, wherein the electrostatic lithium supplementing mechanism comprises an electrostatic generating assembly, a plurality of spraying needle tubes (4), a slurry pump, an electrostatic collecting roller (3) and a lithium powder slurry supplying assembly;
the static collecting roller (3) and the spraying assembly are oppositely arranged and are respectively positioned on two sides of the pole piece in the conveying direction, the static collecting roller (3) is grounded, and the static generating assembly is used for enabling the spraying needle tube (4) to spray lithium powder to the pole piece to be negatively charged;
the injection assembly comprises a plurality of injection needle tubes (4), the plurality of injection needle tubes (4) are arranged at intervals along the width direction of the pole piece, the plurality of injection needle tubes (4) point to the pole piece vertically, the lithium powder slurry supply assembly and the slurry pump are communicated through a pipeline, and the slurry pump is communicated with the plurality of injection needle tubes (4) through pipelines respectively.
2. The negative electrode plate lithium powder lithium supplementing device of claim 1, wherein the slurry pump is a variable frequency pump.
3. The negative pole piece lithium powder lithium supplementing device according to claim 2, wherein a flow meter is arranged on a pipeline between the variable frequency pump and each injection needle tube (4).
4. The negative pole piece lithium powder lithium supplementing device of claim 1, further comprising two limit baffles (7) and an adjusting and fixing assembly, wherein the two limit baffles (7) are arranged on one side of the static collecting roller (3) facing the pole piece at intervals along the axial direction of the static collecting roller (3), the two limit baffles (7) are in sliding fit with the static collecting roller (3), the adjusting and fixing assembly is arranged between the two limit baffles (7) and the static collecting roller (3), the adjusting and fixing assembly is used for enabling the corresponding limit plate to move along the axial direction of the static collecting roller (3), and a space for the pole piece to pass through is formed between the two limit baffles (7).
5. The negative pole piece lithium powder lithium supplementing device of claim 4, wherein the adjusting and fixing assembly comprises a roller frame and two locking fixing pieces, the static electricity collecting roller (3) is rotatably arranged on the roller frame, a guide rod parallel to the axis of the static electricity collecting roller (3) is arranged on the roller frame, the two limit baffles (7) are respectively fixed on the guide rod through the locking fixing pieces, and the connection part of the limit baffles (7) and the guide rod can be adjusted along the length direction of the guide rod.
6. The negative pole piece lithium powder lithium supplementing device of any one of claims 1 to 5, wherein the number of the electrostatic lithium supplementing devices is two, the two electrostatic lithium supplementing devices are arranged at intervals along the conveying direction of the pole piece, and the two electrostatic lithium supplementing devices are respectively used for supplementing lithium to two sides of the pole piece.
7. The negative electrode plate lithium powder lithium supplementing device according to claim 6, further comprising two drying mechanisms (5), wherein the two drying mechanisms (5) are arranged at the downstream of the two electrostatic lithium supplementing mechanisms in a one-to-one correspondence manner.
8. The negative electrode plate lithium powder lithium supplementing device according to claim 7, wherein the drying mechanism (5) is a hot air drying mechanism.
9. The negative electrode plate lithium powder lithium supplementing device according to claim 7 or 8, further comprising an unwinding mechanism (1), a rolling mechanism (6) and a winding mechanism (2), wherein the unwinding mechanism (1), the electrostatic lithium supplementing mechanism, the drying mechanism (5), the rolling mechanism (6) and the winding mechanism (2) are sequentially arranged at intervals along the conveying direction of the electrode plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010579980.0A CN111774195A (en) | 2020-06-23 | 2020-06-23 | Lithium device is mended to negative pole piece lithium powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010579980.0A CN111774195A (en) | 2020-06-23 | 2020-06-23 | Lithium device is mended to negative pole piece lithium powder |
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| CN111774195A true CN111774195A (en) | 2020-10-16 |
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| CN202010579980.0A Pending CN111774195A (en) | 2020-06-23 | 2020-06-23 | Lithium device is mended to negative pole piece lithium powder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113909012A (en) * | 2021-10-08 | 2022-01-11 | 深圳石墨烯创新中心有限公司 | Production facility of graphite alkene coating current collector |
| CN114713469A (en) * | 2022-03-30 | 2022-07-08 | 丰宾电子（深圳）有限公司 | Novel silver paste spraying process for laminated pole piece of capacitor |
| CN114759166A (en) * | 2022-04-07 | 2022-07-15 | 广东捷盟智能装备有限公司 | Double-sided powder spraying and lithium supplementing process |
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| CN114759166A (en) * | 2022-04-07 | 2022-07-15 | 广东捷盟智能装备有限公司 | Double-sided powder spraying and lithium supplementing process |
| CN114759166B (en) * | 2022-04-07 | 2024-04-12 | 广东捷盟智能装备股份有限公司 | Double-sided powder spraying and lithium supplementing process |
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