CN116826212A - Pre-lithium battery cell and preparation method thereof - Google Patents

Pre-lithium battery cell and preparation method thereof Download PDF

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Publication number
CN116826212A
CN116826212A CN202310962244.7A CN202310962244A CN116826212A CN 116826212 A CN116826212 A CN 116826212A CN 202310962244 A CN202310962244 A CN 202310962244A CN 116826212 A CN116826212 A CN 116826212A
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CN
China
Prior art keywords
lithium
pole piece
coating
active material
current collector
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310962244.7A
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Chinese (zh)
Inventor
朱大超
郝鹏杰
刘超辉
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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Application filed by Hefei Guoxuan High Tech Power Energy Co Ltd filed Critical Hefei Guoxuan High Tech Power Energy Co Ltd
Priority to CN202310962244.7A priority Critical patent/CN116826212A/en
Publication of CN116826212A publication Critical patent/CN116826212A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a pre-lithium battery cell and a preparation method thereof, wherein the pre-lithium battery cell comprises a first pole piece, a first diaphragm, a second pole piece and a second diaphragm, the first pole piece comprises a first current collector, a first active substance layer and a lithium-rich metal coating, the first active substance layer and the lithium-rich metal coating are intermittently coated on the first current collector, and the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are sequentially wound after being placed to obtain the pre-lithium winding core; the pre-lithium battery core and the preparation method thereof prepare a first pole piece containing a current collector, a negative electrode material and a metal lithium coating, and then roll the positive electrode material, the negative electrode material and a diaphragm to form a roll core containing the materials; the preparation method of the high-efficiency pre-lithium battery cell is provided, and the position and the dosage of the lithium metal coating can be flexibly controlled, so that the pre-lithiation of the battery can be rapidly completed, and the pre-lithium efficiency and uniformity are improved.

Description

Pre-lithium battery cell and preparation method thereof
Technical Field
The invention relates to the technical field of lithium battery preparation, in particular to a pre-lithium battery cell and a preparation method thereof.
Background
In the manufacturing process of the lithium ion battery, the battery needs to be formed, in the first charge and discharge process of the battery, a layer of SEI film needs to be formed on the surface of the negative electrode material, a part of lithium ions from the positive electrode are permanently consumed, and the consumption of the other part of lithium ions directly leads to the reduction of the charge and discharge capacity of the lithium ion battery. One of the several "lithium-supplementing" methods currently used in the industry is electrochemical pre-lithium, i.e., adding a proper amount of lithium metal material into the battery, and supplementing consumed lithium ions by electrochemical means, thereby achieving the purpose of improving the capacity of the lithium ion battery.
The conventional method is that after the battery cell is manufactured, the prepared composite lithium sheet is stuck on two sides of the conventional battery cell, then the separator is wrapped, and the subsequent assembly, liquid injection and formation are carried out. This approach is cumbersome and inefficient and, for cores of greater thickness, it takes longer for the peripheral lithium metal ions to replenish the consumption of the innermost portion of the core.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a pre-lithium battery cell and a preparation method thereof, and the position and the dosage of a lithium metal coating can be flexibly controlled, so that the pre-lithiation of a battery can be rapidly completed, and the pre-lithium efficiency and uniformity are improved.
The invention provides a pre-lithium battery cell and a preparation method thereof.
Further, the first active material layer and the lithium-rich metal coating layer are disposed to extend along the length direction of the first current collector.
Further, a lithium-rich metal coating is disposed at the first active material layer coating gap location.
Further, the first current collector is made of copper, the thickness is 3-10 um, the first active material layer is made of negative electrode active material, the coating thickness is 50-100 um, and the thickness of the lithium-rich metal coating is 3-15 um.
Further, the second electrode sheet comprises a second current collector and a second active material layer continuously coated on the second current collector, wherein the second metal layer is made of aluminum, and the thickness of the second metal layer is 8-15 um.
The preparation method of the pre-lithium battery cell comprises the following steps that a first pole piece comprises a first current collector, a first active material layer and a lithium-rich metal coating, a second pole piece comprises a second current collector and a second active material layer, and the preparation method comprises the following steps:
s1: coating a first active material layer on a first current collector by adopting an intermittent coating mode to obtain a first pole piece coil stock;
s2: coating a second active material layer on a second current collector by adopting a continuous coating mode to obtain a second pole piece coil stock;
s3: and winding the first pole piece coil stock, the first diaphragm, the second pole piece coil stock and the second diaphragm through a winding needle in sequence to obtain a winding battery core, wherein the lithium-rich metal coating is coated at the gap position of the first active material layer coating on the first current collector before the first pole piece coil stock enters the winding needle.
Further, after step S3, the wound battery cell is assembled, injected with a liquid, packaged, and then formed, thereby obtaining a secondary battery.
Further, the first pole piece is obtained by unreeling through a first pole piece unreeling mechanism, the second pole piece is obtained by unreeling through a second pole piece unreeling mechanism, the output end of the first pole piece unreeling mechanism is connected with the input end of the reeling needle, and the output end of the second pole piece unreeling mechanism is connected with the input end of the reeling needle.
Further, in step S3, specifically includes:
compounding a lithium-rich metal coating on one surface of a PET film according to the set gap and length to obtain a coiled lithium metal composite layer material, and unreeling the lithium metal composite layer material through a lithium unreeling mechanism;
before a first pole piece coil stock unreeled by the first pole piece unreeling mechanism enters the winding needle, a lithium metal composite layer unreeled by the lithium unreeled mechanism is attached to the first pole piece coil stock, and a lithium-rich metal coating on the PET film is transferred to a gap position of a first active material layer coating on the first pole piece coil stock.
Further, in the gap position where the lithium-rich metal coating on the PET film is transferred to the first active material layer coating on the first pole piece coil stock, the widths of the first active material layers on two sides of the gap position are equal in length.
The pre-lithium battery cell and the preparation method thereof provided by the invention have the advantages that: the invention provides a pre-lithium battery cell and a preparation method thereof, and provides a novel winding core structure and a preparation method, wherein a composite pole piece (serving as a first pole piece) containing a current collector, a negative pole material and a lithium metal coating is prepared by precisely controlling the intermittent coating technology and the composite position of the lithium metal coating, and then winding is carried out on the positive and negative pole materials and a diaphragm to form a winding core containing the materials; the preparation method of the high-efficiency pre-lithium battery cell is provided, and the position and the dosage of the lithium metal coating can be flexibly controlled, so that the pre-lithiation of the battery can be rapidly completed, and the pre-lithium efficiency and uniformity are improved.
Drawings
FIG. 1 is a schematic diagram of a square wound cell structure;
FIG. 2 is a schematic diagram of a cylindrical wound cell structure;
FIG. 3 is a schematic view of the structure of a first pole piece;
fig. 4 is a schematic diagram of a winding preparation structure of a pre-lithium battery cell;
wherein, 1-first pole piece, 2-first diaphragm, 3-second pole piece, 4-second diaphragm, 5-lithium metal composite layer material, 10-first pole piece unreeling mechanism, 11-first current collector, 12-first active material layer, 13-lithium-rich metal coating, 20-first diaphragm unreeling mechanism, 30-second pole piece unreeling mechanism, 40-second diaphragm unreeling mechanism, 50-lithium unreeling mechanism, and 60-reel needle.
Detailed Description
In the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 4, the pre-lithium battery cell provided by the invention comprises a first pole piece 1, a first diaphragm 2, a second pole piece 3 and a second diaphragm 4, wherein the first pole piece 1 comprises a first current collector 11, a first active material layer 12 and a lithium-rich metal coating 13, the first active material layer 12 and the lithium-rich metal coating 13 are intermittently coated on the first current collector 11, and the first pole piece 1, the first diaphragm 2, the second pole piece 3 and the second diaphragm 4 are sequentially wound after being placed to obtain the pre-lithium winding core.
A square wound cell as shown in fig. 1. When l=0 in fig. 1, the structure becomes a cylindrical wound cell as shown in fig. 2. The lithium-rich metal coating 13 is directly coated on the first pole piece 1 so as to supplement lithium to the first pole piece 1 and realize lithium supplement to the battery cell, wherein the first active material layer 12 and the lithium-rich metal coating 13 are arranged along the length direction of the first current collector 11 in an extending manner, the length of the lithium-rich metal coating 13 is controllable, preferably, the length of the lithium-rich metal coating 13 is the length of a circle of the lithium-rich metal coating 13 in the sectional view of the pre-lithium winding core, one or more lithium-rich metal coatings 13 can be arranged, preferably, each lithium-rich metal coating 13 is arranged around the circle, and the consistency of lithium supplement efficiency of the battery cell at each position is improved.
In addition, the lithium-rich metal coating 13 can be arranged in two or more than two side by side in the length direction, each lithium-rich metal coating 13 is arranged at the coating gap position of the first active material layer 12, in appearance, the lithium-rich metal coating 13 with the width arranged side by side in the length direction of the first pole piece exists, the lithium-rich metal coating 13 with the length direction arranged intermittently also exists, the specific arrangement structure of the lithium-rich metal coating 13 can be selected according to the lithium supplementing requirement of an actual battery cell.
In addition, for the lithium-rich metal coating 13 with the width being arranged side by side, each lithium-rich metal coating 13 is obtained by unreeling and coating the lithium unreeling mechanisms 50 which are independently arranged, and the lithium unreeling mechanisms 50 work independently and do not disturb each other.
The embodiment provides a secondary battery, which is formed by assembling, injecting and packaging a pre-lithium battery core, wherein lithium ions lost after primary charging and discharging are supplemented through a lithium-rich metal coating, and the pre-lithiation of the battery core is completed, so that the primary efficiency and capacity of the battery are improved, and the capacity of the lithium battery is further improved.
After the first pole piece 1, the first diaphragm 2, the second pole piece 3 and the second diaphragm 4 are sequentially arranged up and down, the pre-lithium winding core is obtained by winding according to a conventional battery core processing mode, wherein the first diaphragm 2 and the second diaphragm 4 adopt conventional diaphragms.
In this embodiment, the lithium-rich metal coating 13 is disposed at a coating gap position of the first active material layer 12, preferably, the widths of the first active material layers on two sides of the gap position are equal, so that the lithium-rich metal coating 13 is located at a middle position of the first pole piece 1, that is, a middle position of the winding core, and lithium ions are simultaneously replenished to the inside and the outside in a subsequent electrochemical pre-lithium process, so as to improve uniformity and efficiency of pre-lithium. For the material of the first pole piece 1: the first current collector 11 is made of copper and has a thickness of 3-10 um, the first active material layer 12 is made of a negative electrode active material, and the coating thickness is 50-100 um, and since the lithium-rich metal coating 13 is too thin and the pre-lithium amount cannot meet the requirement, the lithium-rich metal coating 13 is too thick, lithium metal remains in the battery core, and the inflammability and the explosiveness of the lithium metal can reduce the safety of the battery, so the thickness of the lithium-rich metal coating 13 is 3-15 um.
The second pole piece 3 comprises a second current collector and a second active material layer continuously coated on the second current collector, the second metal layer is made of aluminum, the thickness is 8-15 um, and the second pole piece 3 is formed by conventional continuous coating.
The preparation process of the pre-lithium battery cell is as follows:
as shown in fig. 4, a preparation method of a pre-lithium battery cell is characterized in that a first pole piece 1 comprises a first current collector 11, a first active material layer 12 and a lithium-rich metal coating 13, a second pole piece 3 comprises a second current collector and a second active material layer, and the preparation method comprises the following steps:
s1: coating a first active material layer 12 on a first current collector 11 by adopting an intermittent coating mode to obtain a first pole piece coil stock;
the first active material layer 12 is coated on the first current collector 11 by adopting an intermittent coating mode, one or more blank areas are reserved in the length direction of the first pole piece 1, the first active material layer 12 is respectively arranged on two sides of the width of each blank area, and the blank areas are used for coating the lithium-rich metal coating 13.
S2: coating a second active material layer on a second current collector by adopting a continuous coating mode to obtain a second pole piece coil stock;
the continuous coating mode is a conventional coating mode; the first pole piece 1 is obtained by unreeling the first pole piece unreeling mechanism 10, the second pole piece 3 is obtained by unreeling the second pole piece unreeling mechanism 30, the output end of the first pole piece unreeling mechanism 10 is connected with the input end of the reeling needle 60, the output end of the second pole piece unreeling mechanism 30 is connected with the input end of the reeling needle 60, and as shown in fig. 4, the first pole piece unreeling mechanism 10, the first diaphragm unreeling mechanism 20, the second pole piece unreeling mechanism 30, the second diaphragm unreeling mechanism 40 and the lithium unreeling mechanism 50 are sequentially arranged around the reeling needle 60.
The first pole piece unreeling mechanism 10 comprises a first pole piece unreeling assembly, a first pole piece passing roller assembly, a first pole piece tensioning assembly, a first pole piece cutting assembly and the like, wherein a first pole piece 1 unreeled by the first pole piece unreeling assembly enters an input end of a reeling needle 60 after being conveyed by the first pole piece passing roller assembly and tensioned by the first pole piece tensioning assembly, and is cut by the first pole piece cutting assembly after the first pole piece 1 is unreeled to a set length.
The second pole piece unreeling mechanism 30 comprises a second pole piece unreeling assembly, a second pole piece unreeling roller assembly, a second pole piece tensioning assembly, a second pole piece cutting assembly and the like, wherein the second pole piece 3 unreeled by the second pole piece unreeling assembly enters the input end of the reeling needle 60 after being conveyed by the second pole piece unreeled roller assembly and tensioned by the second pole piece tensioning assembly, and is cut by the second pole piece cutting assembly after the second pole piece 2 is unreeled to a set length.
The first diaphragm unreeling mechanism 20 and the second diaphragm unreeling mechanism 40 are identical in structure and comprise a diaphragm unreeling assembly, a diaphragm passing roller assembly, a diaphragm tensioning assembly, a diaphragm cutting assembly and the like, the first diaphragm 2/first diaphragm 4 unreeled by the diaphragm unreeling assembly is conveyed through the diaphragm passing roller assembly and tensioned by the diaphragm tensioning assembly and then enters the input end of the reeling needle 60, and after the first diaphragm 2/first diaphragm 4 is unreeled to a set length, the diaphragm is cut by the diaphragm cutting assembly.
The lithium unreeling mechanism 50 comprises a lithium unreeling assembly, a lithium roller assembly, a lithium tensioning assembly and a reeling assembly, wherein the lithium metal composite layer material 5 unreeled by the lithium unreeled assembly is conveyed through the lithium roller assembly and is reeled through the reeling assembly after being tensioned by the lithium tensioning assembly.
S3: the winding cell is obtained by winding a first pole piece coil stock, a first diaphragm 2, a second pole piece coil stock and a second diaphragm 4 through a winding needle 60 in sequence, the first pole piece coil stock is coated with a lithium-rich metal coating 13 at the gap position of the coating of a first active material layer 12 on a first current collector 11 before entering the winding needle 60, and the winding cell is assembled, injected with liquid and packaged to obtain the secondary battery.
The specific process of coating the concave first pole piece 1 with the lithium-rich metal coating 13 is as follows:
s31: compounding the lithium-rich metal coating 13 on one surface of the PET film according to the set gap and length to obtain a coiled lithium metal composite layer material 5, and unreeling the lithium metal composite layer material 5 through a lithium unreeling mechanism 50;
because the lithium-rich metal coating 13 is softer in texture and difficult to roll under the condition of no support, in order to realize effective winding of the lithium-rich metal coating 13, the lithium-rich metal coating 13 is firstly compounded on one surface of the PET film, the obtained lithium metal composite layer material 5 is unreeled through a lithium unreeled mechanism and a lithium winding mechanism, and the lithium-rich metal coating 13 on the PET film is transferred to a gap position of the coating of the first active substance layer 12 on the first pole piece coil stock through being attached to the first pole piece 1 in the unreeled process.
S32: before the first pole piece coil stock unreeled by the first pole piece unreeling mechanism 10 enters the reeling needle 60, the lithium metal composite layer unreeled by the lithium unreeled mechanism 50 is attached to the first pole piece coil stock, and the lithium-rich metal coating 13 on the PET film is transferred to the gap position of the coating of the first active material layer 12 on the first pole piece coil stock.
Through steps S31 to S32, the first pole piece 1 is coated with lithium, and the lithium supplementing operation of the winding core is realized.
Through steps S1 to S3, a novel winding core structure and a preparation mode are provided, a composite pole piece (serving as a first pole piece) containing a current collector, a negative electrode material and a metal lithium coating is prepared through an intermittent coating technology and accurate control of the composite position of the lithium-rich metal coating, and then winding is carried out on the positive and negative electrode materials and the diaphragm to form the winding core containing the materials.
As an embodiment:
s100: coating a first active material layer 12 on the first current collector 11 by adopting an intermittent coating mode to obtain a first pole piece coil stock; as shown in fig. 3, the first current collector 11 is a copper foil with a thickness of 6um, the first active material is a silicon-carbon negative electrode material, the thickness of the coating is 57um, the coating is intermittently distributed on the front and back surfaces of the first current collector 11, and the positions of the two surfaces are overlapped.
S200: compounding a lithium-rich metal coating 13 on one surface of a PET film according to the set gap and length to obtain a coiled lithium metal composite layer material 5; the thickness of the lithium-rich metal coating 13 was 10um and the coating gap was 5mm.
S300: coating a second active material layer on a second current collector by adopting a conventional continuous coating mode to obtain a second pole piece coil stock; the second current collector is 12um aluminum foil, the second active substance is lithium iron phosphate anode material, the thickness of the coating is 50um, and the coating is continuously coated on two sides of the second current collector.
S400: according to the sequential winding of the first pole piece coil stock, the first diaphragm 2, the second pole piece coil stock and the second diaphragm 4, meanwhile, before entering a winding needle, the first pole piece 1 finishes the compounding of the lithium-rich metal coating 13 and the first current collector 11 by transferring the lithium-rich metal coating 13 on the PET film to the gap position of the first active material layer coating on the first pole piece 1, so as to obtain the material shown in fig. 3, and it is understood that as an embodiment, the lithium-rich metal coating 13 is positioned in the middle of the first active material layer 12 with equal length at two ends, and the coating length of the lithium-rich metal coating 13 corresponds to one circle of the number 13 shown in fig. 1. As other embodiments of the present invention, the first active material layer 12 may be divided into three or more sections, each two sections being separated by a section of the lithium-rich metal coating layer 13, and the application length of each section of the lithium-rich metal coating layer 13 being the length of one turn at the corresponding position after winding. Finally, the pre-lithium winding core disclosed by the invention is obtained, and the pre-lithium winding core is shown in figure 1.
S500: and assembling, injecting liquid and packaging the pre-lithium battery cell, and then forming to obtain the secondary battery.
Through steps S100 to S500, the preparation method of the high-efficiency pre-lithium battery cell is provided, and the position and the dosage of the lithium metal coating can be flexibly controlled, so that the pre-lithiation of the battery can be rapidly completed, and the pre-lithium efficiency and uniformity are improved.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (10)

1. The utility model provides a lithium electricity core in advance, a serial communication port, including first pole piece (1), first diaphragm (2), second pole piece (3) and second diaphragm (4), first pole piece (1) are including first current collector (11), first active material layer (12) and rich lithium metal coating (13) intermittent type are scribbled on first current collector (11), place the back in order of first pole piece (1), first diaphragm (2), second pole piece (3) and second diaphragm (4) and are coiled into and obtain the lithium core in advance.
2. The pre-lithium battery cell according to claim 1, wherein the first active material layer (12) and the lithium-rich metal coating (13) are arranged extending along the length direction of the first current collector (11).
3. The pre-lithium battery cell according to claim 2, characterized in that a lithium-rich metal coating (13) is provided at the coating gap position of the first active material layer (12).
4. The pre-lithium battery cell according to claim 1, wherein the first current collector (11) is made of copper and has a thickness of 3-10 um, the first active material layer (12) is a negative electrode active material, the coating thickness is 50-100 um, and the thickness of the lithium-rich metal coating (13) is 3-15 um.
5. The pre-lithium battery cell according to claim 1, wherein the second pole piece (3) comprises a second current collector and a second active material layer continuously coated on the second current collector, and the second metal layer is made of aluminum and has a thickness of 8-15 um.
6. The preparation method of the pre-lithium battery cell is characterized in that a first pole piece (1) comprises a first current collector (11), a first active material layer (12) and a lithium-rich metal coating (13), a second pole piece (3) comprises a second current collector and a second active material layer, and the preparation method comprises the following steps:
s1: coating a first active material layer (12) on a first current collector (11) by adopting an intermittent coating mode to obtain a first pole piece coil stock;
s2: coating a second active material layer on a second current collector by adopting a continuous coating mode to obtain a second pole piece coil stock;
s3: the winding core is obtained by winding a first pole piece coil stock, a first diaphragm (2), a second pole piece coil stock and a second diaphragm (4) through a winding needle (60), and the lithium-rich metal coating (13) is coated at the gap position of the coating of the first active material layer (12) on the first current collector (11) before the first pole piece coil stock enters the winding needle (60).
7. The method of manufacturing a pre-lithium battery cell according to claim 6, wherein after step S3, the wound battery cell is assembled, injected with a liquid, packaged, and then formed to obtain a secondary battery.
8. The manufacturing method of the pre-lithium battery cell according to claim 6, wherein the first pole piece (1) is obtained by unreeling through a first pole piece unreeling mechanism (10), the second pole piece (3) is obtained by unreeling through a second pole piece unreeling mechanism (30), an output end of the first pole piece unreeling mechanism (10) is connected with an input end of a reeling needle (60), and an output end of the second pole piece unreeling mechanism (30) is connected with an input end of the reeling needle (60).
9. The method for manufacturing a pre-lithium battery cell according to claim 8, wherein in step S3, specifically comprising:
compounding a lithium-rich metal coating (13) on one surface of a PET film according to a set gap and a set length to obtain a coiled lithium metal composite layer material (5), and unreeling the lithium metal composite layer material (5) through a lithium unreeling mechanism (50);
before a first pole piece coil stock unreeled by the first pole piece unreeling mechanism (10) enters a reeling needle (60), a lithium metal composite layer unreeled by the lithium unreeling mechanism (50) is attached to the first pole piece coil stock, and a lithium-rich metal coating (13) on the PET film is transferred to a gap position of a coating of a first active material layer (12) on the first pole piece coil stock.
10. The method of manufacturing a pre-lithium battery cell according to claim 9, wherein in the gap position where the lithium-rich metal coating (13) on the PET film is transferred to the first active material layer (12) coating on the first pole piece roll, the widths of the first active material layers on both sides of the gap position are equal.
CN202310962244.7A 2023-07-31 2023-07-31 Pre-lithium battery cell and preparation method thereof Pending CN116826212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310962244.7A CN116826212A (en) 2023-07-31 2023-07-31 Pre-lithium battery cell and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310962244.7A CN116826212A (en) 2023-07-31 2023-07-31 Pre-lithium battery cell and preparation method thereof

Publications (1)

Publication Number Publication Date
CN116826212A true CN116826212A (en) 2023-09-29

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ID=88112959

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310962244.7A Pending CN116826212A (en) 2023-07-31 2023-07-31 Pre-lithium battery cell and preparation method thereof

Country Status (1)

Country Link
CN (1) CN116826212A (en)

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