CN113488608A - Unit pole piece preparation method, unit pole piece and lithium battery - Google Patents
Unit pole piece preparation method, unit pole piece and lithium battery Download PDFInfo
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- CN113488608A CN113488608A CN202110747663.XA CN202110747663A CN113488608A CN 113488608 A CN113488608 A CN 113488608A CN 202110747663 A CN202110747663 A CN 202110747663A CN 113488608 A CN113488608 A CN 113488608A
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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
- H01M4/04—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
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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
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
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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
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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
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- General Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a unit pole piece preparation method, a unit pole piece and a lithium battery, and relates to the technical field of battery cell preparation. The preparation method of the unit pole piece comprises the following steps: preparing slurry; embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between the two blank areas; cutting the foil subjected to embossing treatment to obtain a unit foil with a tab, wherein the unit foil comprises a blank area and a rolling area, and the tab is formed in the blank area; coating the slurry on a rolling area of the unit foil to obtain a coating film sheet; drying the film coating sheet; and carrying out hot rolling on the dried film coating sheet to obtain the unit pole piece. The preparation method of the unit pole piece provided by the invention can avoid the waste of slurry and save the production cost.
Description
Technical Field
The invention relates to the technical field of battery cell preparation, in particular to a unit pole piece preparation method, a unit pole piece and a lithium battery.
Background
At present, in the process of preparing unit pole pieces in the market, the process is generally carried out according to the process sequence of pulping, coating, baking, rolling, slitting and die cutting.
Since the sizing agent is coated on the foil before the cutting and the die cutting, the sizing agent is attached to the cut leftover materials in the cutting and the die cutting processes, the waste of the sizing agent is extremely large, and the production cost is high.
Disclosure of Invention
The invention aims to provide a preparation method of a unit pole piece, which can avoid the waste of slurry and save the production cost.
Another object of the present invention is to provide a unit pole piece, which is lower in production cost.
It is a further object of the present invention to provide a lithium battery which is less expensive to produce.
The invention provides a technical scheme that:
a preparation method of a unit pole piece comprises the following steps:
preparing slurry;
embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between the two blank areas;
cutting the foil subjected to embossing treatment to obtain a unit foil with a tab, wherein the unit foil comprises the blank area and the rolling area, and the tab is formed in the blank area;
coating the slurry on the rolling area of the unit foil to obtain a coating film sheet;
drying the film coating sheet;
and carrying out hot rolling on the dried film coating sheet to obtain a unit pole piece.
In an alternative embodiment, the step of cutting the foil subjected to the embossing process to obtain the unit foil with the tab includes:
cutting the foil subjected to embossing treatment to obtain cut foils, wherein the cut foils consist of the rolling area and the blank area;
and die cutting is carried out on the cut foil pieces to obtain the unit foil pieces.
In an alternative embodiment, the step of slitting the embossed foil to obtain slit foils includes:
taking the middle point of the rolling area in the transverse direction as a starting point, and longitudinally slitting the foil;
and transversely cutting the foil subjected to longitudinal cutting to obtain the cut foil.
In an alternative embodiment, the step of applying the slurry to the calendering zone of the unit foil to obtain a film-coated sheet includes:
inserting the calendering zones of the unit foils into a cavity of a pasting mold;
injecting the slurry into the mold cavity to adhere the slurry to the calendered regions of the unit foils;
and carrying out tap treatment on the coating mould to obtain the coating sheet.
In an alternative embodiment, before the step of performing the tap treatment on the coating die to obtain the coated sheet, the method further includes:
and carrying out a strickling treatment on the slurry attached to the calendering zone of the unit foil.
In an alternative embodiment, the step of hot rolling the dried film-coated sheet to obtain a unit pole piece includes:
and carrying out hot rolling on the rolling area of the dried film coating sheet.
In an alternative embodiment, before the step of embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between two blank areas, the method further comprises:
the slurry is hermetically stored in an environment having a humidity of less than or equal to 20%.
In an alternative embodiment, the slurry has a solids content of 75% to 85% and a viscosity of 5000mpas to 100000 mpas.
The embodiment of the invention also provides a unit pole piece, wherein the unit pole piece is prepared by the unit pole piece preparation method, and the unit pole piece preparation method comprises the following steps: preparing slurry; embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between the two blank areas; cutting the foil subjected to embossing treatment to obtain a unit foil with a tab, wherein the unit foil comprises the blank area and the rolling area, and the tab is formed in the blank area; coating the slurry on the rolling area of the unit foil to obtain a coating film sheet; drying the film coating sheet; and carrying out hot rolling on the dried film coating sheet to obtain a unit pole piece.
The embodiment of the invention also provides a lithium battery, which comprises the unit pole piece, wherein the unit pole piece is prepared by the unit pole piece preparation method, and the unit pole piece preparation method comprises the following steps: preparing slurry; embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between the two blank areas; cutting the foil subjected to embossing treatment to obtain a unit foil with a tab, wherein the unit foil comprises the blank area and the rolling area, and the tab is formed in the blank area; coating the slurry on the rolling area of the unit foil to obtain a coating film sheet; drying the film coating sheet; and carrying out hot rolling on the dried film coating sheet to obtain a unit pole piece.
Compared with the prior art, the unit pole piece preparation method provided by the invention has the advantages that the foil is cut firstly to obtain the unit foil with the pole lug, then the unit foil is coated with slurry, and after the coating is finished, the unit foil is directly dried and hot-rolled to obtain the unit pole piece. Avoiding cutting after coating and preventing slurry waste. Therefore, the unit pole piece preparation method provided by the invention has the beneficial effects that: can avoid the waste of slurry and save the production cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a flow chart of a method for manufacturing a unit pole piece according to an embodiment of the present invention;
FIG. 2 is a schematic transverse cross-sectional view of a foil after embossing;
FIG. 3 is a block flow diagram illustrating the sub-steps of step S103 in FIG. 1;
FIG. 4 is a schematic structural diagram of a slit foil obtained by slitting a foil;
FIG. 5 is a schematic diagram of a unit foil obtained by die cutting a cut foil;
fig. 6 is a block flow diagram of a sub-step of sub-step S1031 in fig. 3;
FIG. 7 is a block flow diagram of sub-steps of step S104 in FIG. 1;
fig. 8 is a schematic structural diagram of a unit pole piece according to an embodiment of the present invention.
Icon: 10-white space; 11-a tab; 20-a calendering zone; 30-slitting the foil; 40-unit foil; 50-unit pole piece; 51-slurry layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Examples
Referring to fig. 1, fig. 1 is a flow chart of a method for manufacturing a unit pole piece according to the present embodiment, where the method for manufacturing a unit pole piece can avoid waste of slurry and save production cost. The preparation method of the unit pole piece comprises the following steps:
step S101, preparing a slurry.
And mixing the powder with a solvent to obtain the slurry meeting the process requirement. In order to prevent the slurry from cracking and falling off after coating, in this example, the prepared slurry has a solid content of 75% to 85% and a viscosity of 5000mpas to 100000 mpas.
Also, after the preparation of the slurry is completed, the slurry needs to be hermetically stored in an environment having a humidity of 20% or less.
Step S102, embossing the foil.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a foil after embossing. In this embodiment, an embossing mold is used to press and hold the middle region of one side of the foil, so that the two edges of the foil in the longitudinal direction form blank regions 10, and a rolling region 20 with concave-convex lines is formed between the two blank regions 10.
Embossing the foil to improve the adhesive force of the slurry during slurry coating in the rolling area 20 and prevent the foil from generating uneven extension in the hot rolling process to cause different thicknesses in different areas.
In practical application, the concave-convex lines of the rolling area 20 can be adjusted by selecting different embossing dies according to practical application conditions, and a triangular or rhombic convex structure can be formed.
And step S103, cutting the foil subjected to the embossing treatment to obtain a unit foil 40 with the tabs.
The cutting of the foil includes slitting and die cutting.
Referring to fig. 3, fig. 3 is a block diagram illustrating a flow of substeps of step S103, wherein step S103 comprises the substeps of:
and a substep S1031 of cutting the foil subjected to the embossing treatment to obtain a cut foil 30.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a slit foil 30 obtained by slitting a foil.
The slit foils 30 are composed of the calendering zone 20 and the whitening zone 10, and the single slit foil 30 includes a whitening zone 10 and an extending zone, and the whitening zone 10 is located at one side of the extending zone.
In the sub-step S1032, the cut foil sheet 30 is die cut to obtain the unit foil sheet 40.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a unit foil 40 obtained by die cutting the cut foil 30.
The die cutting treatment is to cut the unit foil 40 according to the shape and specification of the unit pole piece, wherein the unit foil 40 comprises a blank area 10 and a rolling area 20, and the tab 11 is formed by the blank area 10.
Referring to fig. 6, fig. 6 is a block diagram illustrating a flow of sub-step S1031, and the sub-step S1031 includes the following sub-steps:
the substep S1031a cuts the foil longitudinally with the midpoint of the calendering zone 20 in the transverse direction as the starting point.
Referring again to fig. 2, after the foil is embossed, the foil is longitudinally slit using the middle point of the calendering zone 20 shown in fig. 2 in the transverse direction as a cutting start point, and the length of the longitudinal slit is determined according to the width and the number of the unit foils 40 required. After longitudinal slitting, the web is divided into two portions, each portion comprising a calender zone 20 and a blank zone 10.
And a substep S1031b, transversely cutting the longitudinally cut foil to obtain the cut foil 30.
After longitudinal cutting, multiple times of interval transverse cutting are carried out according to the width of the required unit foil 40, and after each time of transverse cutting, two cut foils 30 can be obtained, wherein each cut foil 30 comprises a rolling area 20 and a blank area 10, as shown in fig. 4.
With reference to fig. 1, the method for manufacturing the unit electrode plate further includes:
in step S104, the slurry is applied to the rolling zone 20 of the unit foil 40 to obtain a coated sheet.
Referring to fig. 7, fig. 7 is a block diagram illustrating a flow of the sub-steps of step S104, wherein step S104 includes the following sub-steps:
in the substep S1041, the rolled region 20 of the unit foil 40 is inserted into the cavity of the pasting mold.
And (3) inserting the rolling area 20 of the unit foil 40 into a die cavity of the sizing die by adopting a universal sizing die, so that the tab is exposed, and only the rolling area 20 is coated.
In the sub-step S1042, the slurry is injected into the cavity so that the slurry is adhered to the rolled section 20 of the unit foil 40.
In the sub-step S1043, the paste attached to the rolling zone 20 of the unit foil 40 is subjected to a leveling process.
Adopt scraper or other devices to strickle off the thick liquids that adhere to in calendering district 20 for thick liquids can fully fill in the line of calendering district 20, guarantee that thick liquids can be firm to adhere to in calendering district 20.
And a substep S1044 of performing tap compaction treatment on the coating mould to obtain a coating film sheet.
The mode of ultrasonic vibration or mechanical vibration is adopted, the compaction density of the slurry in the calendering zone 20 is ensured, and the coating effect is improved.
With reference to fig. 1, the method for manufacturing the unit electrode plate further includes:
and step S105, drying the coated sheet.
The drying process is generally carried out in an environment of 100 ℃ to 180 ℃, so that the coated sheet can be rapidly dried.
Further, the preparation method of the unit pole piece also comprises the following steps:
and S106, carrying out hot rolling on the dried film coating sheet to obtain a unit pole piece.
In this embodiment, the hot-pressing roll is used to hot-roll the rolling area 20 of the dried film-coated sheet, so as to prevent the pole piece from rebounding after being compacted and prevent the pole tab from being hot-rolled.
In summary, the unit pole piece preparation method provided in this embodiment cuts and die-cuts the foil before coating the slurry, so as to avoid slurry waste, and embosses the foil at the best before coating, thereby improving the adhesion effect of the slurry, improving the ductility of the foil, preventing uneven extension in the hot rolling process, and further improving the quality of the prepared unit pole piece.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a unit pole piece 50 according to the present embodiment. The unit pole piece 50 includes a unit foil 40 and a slurry layer 51, and the unit pole piece 50 is prepared by the unit pole piece preparation method of the steps S101 to S106. The unit pole piece provided by the embodiment has lower preparation cost and better quality.
The present embodiment also provides a lithium battery, which includes the aforementioned unit electrode plate 50. The lithium battery is lower in preparation cost and better in electrical property.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a unit pole piece is characterized by comprising the following steps:
preparing slurry;
embossing the foil to form blank areas on two sides of the foil in the longitudinal direction, and forming a rolling area with concave-convex lines between the two blank areas;
cutting the foil subjected to embossing treatment to obtain a unit foil with a tab, wherein the unit foil comprises the blank area and the rolling area, and the tab is formed in the blank area;
coating the slurry on the rolling area of the unit foil to obtain a coating film sheet;
drying the film coating sheet;
and carrying out hot rolling on the dried film coating sheet to obtain a unit pole piece.
2. The method for preparing a unit pole piece according to claim 1, wherein the step of cutting the foil subjected to the embossing treatment to obtain the unit foil with the tab comprises the following steps:
cutting the foil subjected to embossing treatment to obtain cut foils, wherein the cut foils consist of the rolling area and the blank area;
and die cutting is carried out on the cut foil pieces to obtain the unit foil pieces.
3. The method for preparing the unit pole piece according to claim 2, wherein the step of slitting the foil subjected to the embossing treatment to obtain the slit foil comprises the following steps:
taking the middle point of the rolling area in the transverse direction as a starting point, and longitudinally slitting the foil;
and transversely cutting the foil subjected to longitudinal cutting to obtain the cut foil.
4. The method for preparing a unit pole piece according to claim 1, wherein the step of coating the slurry on the calendering zone of the unit foil to obtain a coated sheet comprises the following steps:
inserting the calendering zones of the unit foils into a cavity of a pasting mold;
injecting the slurry into the mold cavity to adhere the slurry to the calendered regions of the unit foils;
and carrying out tap treatment on the coating mould to obtain the coating sheet.
5. The method for preparing the unit pole piece according to claim 4, wherein before the step of performing the tapping process on the pasting mold to obtain the coating film sheet, the method further comprises the following steps:
and carrying out a strickling treatment on the slurry attached to the calendering zone of the unit foil.
6. The method for preparing the unit pole piece according to claim 1, wherein the step of hot rolling the dried film-coated sheet to obtain the unit pole piece comprises:
and carrying out hot rolling on the rolling area of the dried film coating sheet.
7. The method for preparing a unit pole piece according to claim 1, wherein before the step of embossing the foil to form blank regions on two sides of the foil in the longitudinal direction and forming a calendering region with concave-convex lines between the two blank regions, the method further comprises:
the slurry is hermetically stored in an environment having a humidity of less than or equal to 20%.
8. The method for preparing the unit pole piece according to claim 1, wherein the slurry has a solid content of 75 to 85% and a viscosity of 5000 to 100000 mpas.
9. A unit pole piece, which is characterized in that the unit pole piece is prepared by the unit pole piece preparation method of any one of claims 1 to 8.
10. A lithium battery comprising the unit pole piece according to claim 9.
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| CN202110747663.XA CN113488608B (en) | 2021-07-02 | 2021-07-02 | Unit pole piece preparation method, unit pole piece and lithium battery |
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| CN202110747663.XA CN113488608B (en) | 2021-07-02 | 2021-07-02 | Unit pole piece preparation method, unit pole piece and lithium battery |
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| CN114535934A (en) * | 2022-02-23 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Pole piece rolling method and pole piece |
| CN115020655A (en) * | 2022-07-07 | 2022-09-06 | 贵州航盛锂能科技有限公司 | Sodium ion battery negative electrode material and preparation method thereof |
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| CN113488608B (en) | 2022-12-16 |
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