CN115050928A - Pole piece preparation method, pole piece and battery cell - Google Patents
Pole piece preparation method, pole piece and battery cell Download PDFInfo
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- CN115050928A CN115050928A CN202210768219.0A CN202210768219A CN115050928A CN 115050928 A CN115050928 A CN 115050928A CN 202210768219 A CN202210768219 A CN 202210768219A CN 115050928 A CN115050928 A CN 115050928A
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- pole piece
- active material
- current collector
- coating
- electrode plate
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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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- 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
- H01M4/0402—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
- 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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- 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 pole piece preparation method, a pole piece and a battery cell, wherein the pole piece preparation method comprises the following steps: pasting gummed paper on the preset position of the current collector; coating the active substance slurry on the surface of the current collector stuck with the gummed paper, and rolling and baking to obtain a pole piece; removing the gummed paper, and forming a blank foil area on the pole piece at a preset position; the adhesive tape is pasted on the preset position on the current collector before the active material slurry is coated, and after the pole piece is manufactured, the adhesive tape is removed, a hollow foil area is formed on the pole piece, the active material on the preset position is effectively removed, so that the edge of the coating area of the active material slurry is consistent with the thickness of the active material slurry coated in the middle, the consistency of the thickness of the pole piece is improved, and lithium precipitation is prevented from occurring more easily at the edge of the coating area of the active material slurry in the quick charging process.
Description
Technical Field
The invention relates to the technical field of battery manufacturing, in particular to a pole piece preparation method, a pole piece and a battery cell.
Background
Nowadays, with the rapid growth of population and the rapid development of social economy, the shortage of resources and energy sources is increasing, the environmental protection is increasingly emphasized, and the development and saving of energy sources become an important subject in the world today. Energy is the foundation of existence and development of human society, and the modern society based on mineral energy is increasingly frequently confronted with energy shortage and environmental pollution crisis. Meanwhile, with the coming of the information-oriented high-tech era, the energy application form is changing, and the demand of renewable, pollution-free, small-sized and discrete mobile high-performance power sources is rapidly increasing. Green, high-efficiency secondary batteries are being vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
At present, lithium ion batteries have entered into various aspects of daily life of people, and due to the improvement of the universality of the use of the lithium ion batteries, people have stricter requirements on the type of batteries, and besides the improvement of battery materials and manufacturing processes, the battery structure is further optimized.
In the prior art, pole pieces of a multi-tab battery are generally coated in a zebra mode, namely dressing coating is carried out in the middle of an aluminum foil, and a blank foil is reserved at the edge of the aluminum foil to be used for tab cutting and leading out. The process enables the edge of the coating area of the pole piece to have a thinning area, the active material content of the area is less, the capacity of accommodating lithium ions is insufficient, and lithium separation is easy to occur in the quick charging process.
Disclosure of Invention
One of the objectives of the present application is: the preparation method of the pole piece solves the technical problems that the edge of a pole piece coating area in the prior art is low in active material content and easy to separate lithium, achieves consistency of the thickness of the pole piece, and prevents the edge of the coating area of active material slurry from being easy to separate lithium in a quick charging process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a pole piece comprises the following steps:
pasting gummed paper on the preset position of the current collector;
coating the active substance slurry on the surface of the current collector stuck with the gummed paper, and rolling and baking to obtain a pole piece;
and removing the gummed paper, and forming a hollow foil area on the pole piece at a preset position.
Preferably, the empty foil region is spaced from the coated region of the active material slurry.
Preferably, the pole piece is cut along the length direction thereof to obtain a plurality of single pole pieces.
Preferably, the method further comprises the step of cutting a plurality of tabs along the empty foil area to obtain the multi-tab pole piece.
Preferably, the gummed paper comprises a base layer and an adhesive layer, wherein the adhesive layer is connected with the base layer and the current collector.
Preferably, the base layer is PET and the tie layer is an acrylate polymer.
Preferably, the thickness of the gummed paper is 8-20 μm.
Preferably, the width of the preset position is larger than that of the gummed paper.
Another object of the present invention is to: the pole piece is prepared by the preparation method of the pole piece, which is described in the specification.
Yet another object of the present invention is to: the battery cell comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, wherein the positive pole piece and/or the negative pole piece is/are the pole piece described in the specification.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a preparation method of a pole piece, which is characterized in that adhesive paper is pasted on a preset position on a current collector before active substance slurry is coated, and after the pole piece is prepared, the adhesive paper is removed, a hollow foil area is formed on the pole piece, and active substances on the preset position are effectively removed, so that the thickness of the edge of the coating area of the active substance slurry is consistent with that of the active substance slurry coated in the middle part, the consistency of the thickness of the pole piece is improved, and the lithium precipitation is prevented from being more easily generated on the edge of the coating area of the active substance slurry in the quick charging process.
Additional aspects and advantages of the invention 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
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the current collector of the present invention.
Fig. 2 is a schematic structural diagram of the pole piece after being pasted with the adhesive paper.
FIG. 3 is a schematic structural diagram of the pole piece after the adhesive paper is removed.
FIG. 4 is a schematic structural diagram of a pole piece according to the present invention.
FIG. 5 is another structural diagram of the pole piece of the present invention.
FIG. 6 is a schematic view of another structure of the pole piece of the present invention.
Fig. 7 is a schematic structural view of the adhesive paper of the present invention.
Reference numerals:
100. pole pieces;
10. a current collector; 11. a coating zone; 12. a predetermined position; 13. a region of empty foil; 131. a tab;
20. an active material slurry;
30. gummed paper; 31. a base layer; 32. a tie layer;
40. a single pole piece;
a. the width of the gummed paper; b. the width of the preset position; c. the length direction of the pole piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The term "and/or" in the present invention is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the present invention, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
The battery cell provided by the embodiment of the invention mainly depends on metal ions to move between the positive pole piece and the negative pole piece for working.
The positive pole piece provided by the embodiment of the invention comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector; the positive pole mass flow body includes anodal coating district and connects in anodal utmost point ear in anodal coating district, and anodal coating district has anodal active substance layer, and anodal utmost point ear does not coat anodal active substance layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may include, but is not limited to, metal foil, etc., and more specifically may include, but is not limited to, aluminum foil, etc., the positive electrode active material layer includes a positive electrode active material, a binder, a conductive material, the positive electrode active material may include, but is not limited to, one or more combinations of compounds represented by chemical formulas such as LiaNixCoyMzO2-bNb (where 0.95. ltoreq. a.ltoreq.1.2, x >0, y. gtoreq.0, z. gtoreq.0, and x + y + z. gtoreq.1, 0. ltoreq. b.ltoreq.1, M is selected from Mn, Al, N is selected from F, P, S is selected from one or more combinations of F, P, S), and the positive electrode active material may also be one or more combinations including, but not limited to, LiCoO2, LiNiO2, LiVO2, LiCrO2, LiMn2O4, LiCoMnO4, Li2NiMn3O8, lini0.5opo, lico 894, LiCoPO, lico 3959636, lico, lifes 9626, lifeps, or combinations of lifnos. 3648.
The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, wherein the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative coating area and a negative electrode lug connected to the negative coating area, the negative coating area is coated with a negative active material layer, and the negative electrode lug is not coated with the negative active material layer. Negative current collectors include, but are not limited to: copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, or a polymer substrate coated with a conductive metal. The negative electrode current collector may be selected from the group consisting of copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, conductive metal coated polymer substrate, and combinations thereof, the negative electrode active material layer includes a negative electrode active material, a binder, a conductive material, the negative electrode active material includes, but is not limited to: lithium metal, structured lithium metal, natural graphite, artificial graphite, mesophase micro carbon spheres (MCMB), hard carbon, soft carbon, silicon carbon composites, Li-Sn alloys, Li-Sn-O alloys, Sn, SnO2, spinel structured lithiated TiO2-Li4Ti5O12, Li-Al alloys, or any combination thereof. Wherein silicon carbon composite means at least about 5 wt% silicon based on the weight of the silicon carbon negative electrode active material.
The separator mentioned in the embodiments of the present invention may include a substrate layer and a surface treatment layer. The substrate layer is a non-woven fabric, a film or a composite film with a porous structure, and the material of the substrate layer is at least one selected from polyethylene, polypropylene, polyethylene terephthalate and polyimide. Specifically, a polypropylene porous film, a polyethylene porous film, a polypropylene nonwoven fabric, a polyethylene nonwoven fabric, or a polypropylene-polyethylene-polypropylene porous composite film can be used.
The "plurality" appearing in the present invention means two or more (including two).
The present invention will be described in further detail with reference to fig. 1 to 7, but the present invention is not limited thereto.
Referring to fig. 1 to 4, an embodiment of the invention is a method for manufacturing a pole piece, including the following steps:
pasting gummed paper 30 on the preset position 12 of the current collector 10;
coating the active substance slurry 20 on the surface of the current collector 10 adhered with the adhesive tape 30, and rolling and baking to obtain a pole piece 100;
the adhesive paper 30 is removed and the pole piece 100 forms a blank foil area 13 at the predetermined location 12.
Compared with the prior art, the embodiment of the invention is a preparation method of a pole piece, which is characterized in that adhesive tape 30 is pasted on a preset position 12 on a current collector 10 before active material slurry 20 is coated, after a pole piece 100 is prepared, the adhesive tape 30 is removed, a hollow foil area 13 is formed on the pole piece 100, active materials on the preset position are effectively removed, the thickness of the edge of a coating area 11 of the active material slurry 20 is consistent with that of the active material slurry 20 coated in the middle, the consistency of the thickness of the pole piece 100 is improved, and lithium precipitation is prevented from being more easily generated on the edge of the coating area 11 of the active material slurry 20 in the quick charging process.
It should be noted that the surface dyne value of the adhesive tape 30 is 40dyne, which effectively makes the surface dyne value of the adhesive tape 30 greater than the surface dyne value of the current collector 10, thereby preventing the active material slurry 20 from being unable to adhere to the surface of the adhesive tape 30, causing the active material slurry 20 to flow back to the coating area 11 of the active material slurry 20, and avoiding the occurrence of the phenomenon of the thick edge of the pole piece 100, which affects the consistency of the thickness of the pole piece 100. If the surface dyne value of the adhesive tape 30 is too small, the surface dyne value of the adhesive tape 30 is smaller than that of the current collector 10, the adsorption capacity of the surface of the adhesive tape 30 to the active substance slurry 20 is poor, and the active substance slurry 20 is easy to accumulate in the coating area 11, so that the thick edge phenomenon of the pole piece 100 is caused; if the surface dyne value of the adhesive tape 30 is too large, the surface dyne value of the adhesive tape is far larger than that of the current collector 10, the adsorption capacity of the surface of the current collector 10 to the active material slurry 20 is poor, the active material slurry 20 is easily accumulated on the surface of the adhesive tape 30, and the thickness of the active material slurry 20 in the coating area 11 is reduced, so that the energy density of a battery cell which is continuously manufactured is affected.
Note that the current collector 10 is provided with a coating region 11 adjacent to the predetermined position 12, and the active material slurry 20 is applied to the coating region 11.
The application method of the active material slurry 20 is batch application, continuous application, or zebra application.
It should be noted that the empty foil region 13 can be used for electrical connection, for example, after the cell is manufactured, the empty foil region 13 can be electrically connected with a current collecting plate, a casing, a cover plate or a pole. In order to increase the electrical conductivity of the empty foil region 13, a conductive adhesive may be provided in the contact area of the empty foil region 13 with the current collecting plate, the housing, the cover plate or the pole.
Referring to fig. 6, an embodiment of the present invention is such that the empty foil region 13 is spaced apart from the coating region 11 of the active material slurry 20. A plurality of predetermined positions 12 are sequentially arranged in the width direction of the current collector 10, a gummed paper 30 is pasted on each predetermined position 12, and after the electrode sheet 100 is manufactured, the gummed paper 30 is removed so that the empty foil region 13 is arranged at an interval from the coating region 11 of the active material slurry 20. In preparation for subsequent preparation of a plurality of pole pieces 100.
In the embodiment of the present invention, the pole piece 100 is cut along the length direction c to obtain a plurality of single pole pieces 40. By cutting along the length direction c of the pole piece 100, a plurality of single pole pieces 40 are obtained, the single pole pieces 40 can be effectively processed, and the processing efficiency is improved.
It should be noted that, in the embodiment of the present invention, the multiple regions of the single pole piece 100 are sequentially divided along the length direction c of each single pole piece 40, and the single pole piece is cut along the boundary between two adjacent regions of the single pole piece 100 to obtain multiple first single pole pieces, and the size of each first single pole piece is consistent, so that the multiple first single pole pieces are suitable for the battery cells of the same specification, and meanwhile, the multiple pole pieces 100 can be prepared, so as to improve the processing efficiency.
Referring to fig. 5, the embodiment of the present invention further includes cutting a plurality of tabs 131 along the empty foil area 13 to obtain a multi-tab electrode sheet. A plurality of utmost point ears 131 are cut out through empty paper tinsel district 13, obtain many utmost point ear pole pieces, compare in unipolar ear 131, and many utmost point ears 131's conductivity is higher, and resistance is little, and charge rate is higher.
It should be noted that the cutting can be performed on the die-cutting tab 131, and the tab 131 can also be cut by laser, unlike the die-cutting tab 131, when the tab 131 is cut by laser, the size of a laser beam is small, so that a welding seam after the laser cutting is small, and the accuracy of cutting the tab 131 can be effectively improved.
It should be noted that the distance between two adjacent tabs 131 can be set according to actual requirements.
Referring to fig. 7, the adhesive sheet 30 of the present embodiment includes a base layer 31 and an adhesive layer 32, wherein the adhesive layer 32 connects the base layer 31 and the current collector 10. Through basic unit 31 and tie coat 32's setting, tie coat 32 connects basic unit 31 and current collector 10, can effectually make adhesive tape 30 paste on current collector 10, after making pole piece 100, get rid of adhesive tape 30, form empty foil district 13 on pole piece 100, the effectual active material that puts in advance of getting rid of, the edge that makes active material thick liquids 20's coating district 11 keeps unanimous with the active material thick liquids 20's of middle part coating thickness, thereby improve the uniformity of pole piece 100 thickness.
In the embodiment of the present invention, the base layer 31 is PET, and the adhesive layer 32 is an acrylate polymer. Through basic unit 31 for PET, tie coat 32 is acrylate polymer's setting, because pole piece 100 toasts the temperature and is 90 ~ 130 ℃, acrylate polymer's thermal stability is higher, it loses the sticky temperature and is higher than pole piece 100's toasting temperature, make pole piece 100 toast the in-process, adhesive tape 30 can not lose the viscidity by the influence of toasting the temperature, adhesive tape 30 can not drop, the effectual back that prevents adhesive tape 30 and drop, the active material on the adhesive tape 30 drops on preset position 12, or, active material thick liquids 20 on 11 edges in coating district drop on preset position 12, thereby thin material district appears on pole piece 100, and then lead to appearing analyzing lithium in fast-charging in-process thin material district.
It should be noted that, in the embodiment of the present invention, the adhesive tape 30 is physically peeled off, and the thermal stability of the adhesive tape 30 is higher and is not affected by the baking temperature of the pole piece 100. The embodiment of the invention can strip the adhesive paper 30 after coating and baking, and also after rolling and splitting. In addition, in the embodiment of the invention, the adhesive paper 30 can be directly removed to form the empty foil area 13 on the pole piece 100, and the active substances are not required to be cleaned by laser, so that the operation is simple.
The thickness of the adhesive paper 30 of the embodiment of the invention is 8-20 μm. Through the thickness setting of adhesive tape 30, the thickness of adhesive tape 30 is 8 ~ 20 mu m, and in the in-process of active material thick liquids 20 coating, can normally pass through the opening of coating machine gasket, the coating of effective active material thick liquids 20 of preventing because of the too thick influence of the thickness of adhesive tape 30. If the thickness of the adhesive tape is less than 8 μm, the thickness of the adhesive tape 30 is smaller, the difference between the thickness of the adhesive tape 30 and the thickness of the coated active material slurry 20 is larger, and in order to maintain the thickness consistency of the pole piece 100, more active material slurry 20 needs to be coated on one side of the adhesive tape 30 close to the coating area 11, which is easy to cause waste; if the thickness of the adhesive tape 30 is greater than 20 μm, the thickness of the adhesive tape 30 is thick, affecting the coating of the active material slurry 20 in the coating region 11.
The embodiment of the present invention is that the width b of the preset position 12 is larger than the width a of the adhesive tape 30. Through the width a of adhesive tape 30, the setting of the width b of presetting position 12, the width b of presetting position 12 is greater than the width a of adhesive tape 30, when pasting adhesive tape 30, can effectually guarantee that adhesive tape 30 paste the back and can not surpass the edge of mass flow body, simultaneously, when utmost point ear 131 is cut, ensure that the cutter preserves the certain distance with the active material who coats district 11, prevent the cutter and the active material contact who coats district 11, lead to follow-up behind the making electric core, the easy short circuit of electric core.
It should be noted that the method can be used for the positive electrode plate and/or the negative electrode plate.
The adhesive paper 30 has a width of 10 to 11mm, and the preset position 12 has a width b of 11 to 15 mm. When the adhesive sheet 30 is attached, the adhesive sheet 30 is attached to the edge of the position to be coated with the active material paste 20.
It should be noted that the pole piece 100 prepared in the above embodiment of the present invention includes the empty foil area 13 and the coating area 11, and the empty foil area 13 is further provided with the safety area, which can ensure that when the tab 131 is cut by laser, the contact between the cutter and the active material on the coating area 11 is prevented, which affects the thickness uniformity of the active material on the coating area 11, and meanwhile, the active material on the edge of the active material layer is easily melted by heat, which causes the failure of the active material in the edge area.
Further, in order to prevent the active material in the edge area from losing efficacy due to the fact that the cutter is in contact with the active material in the coating area 11 and the active material on the edge of the active material layer is hot-melted when laser die cutting is carried out. The security zone may be coated with an insulating material to form an adjacent insulating layer to the coated area 11.
Another embodiment of the present invention is a pole piece, which is manufactured by the method of manufacturing a pole piece described in the foregoing specification.
Compared with the prior art, another embodiment of the present invention is a pole piece, the pole piece 100 is manufactured by the above-mentioned pole piece manufacturing method, the glue paper 30 of the pole piece 100 is removed, the empty foil area 13 is formed on the pole piece 100, and the active material on the preset position is effectively removed, so that the thickness of the edge of the coating area 11 of the active material slurry 20 is consistent with the thickness of the active material slurry 20 coated in the middle, thereby improving the consistency of the thickness of the pole piece 100, and preventing the lithium precipitation from occurring more easily at the edge of the coating area 11 of the active material slurry 20 in the quick charging process.
Another embodiment of the present invention is an electrical core, including a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, where the positive electrode plate and/or the negative electrode plate is a plate in the foregoing description.
Compared with the prior art, another embodiment of the invention is an electric core, wherein a positive pole piece, a negative pole piece and a diaphragm are used in cooperation, the diaphragm is arranged between the positive pole piece and the negative pole piece and is used for isolating the positive pole piece and the negative pole piece, the positive pole piece and/or the negative pole piece is the pole piece 100, the thickness consistency of the pole piece 100 is high, and lithium precipitation at the edge of an active substance in a charging process can be effectively prevented.
It should be noted that the battery core may be a winding core structure or a lamination structure. When the battery core is in a roll core structure, the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked and wound to form the roll core structure; when the battery core is of a laminated structure, the positive pole piece, the diaphragm and the negative pole piece are sequentially stacked, and the number of the positive pole piece, the negative pole piece and the diaphragm can be set according to actual requirements.
It should be noted that, when the battery cell is of a laminated structure, the battery cell has the advantages of high capacity density, high energy density, flexible size and the like; when the battery cell is in a roll core structure, the internal resistance of the battery cell is high under the condition that the positive plate and the negative plate are only provided with a single tab, and meanwhile, the production process is relatively simple and convenient to control.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A preparation method of a pole piece is characterized by comprising the following steps:
pasting gummed paper (30) on a preset position (12) of the current collector (10);
coating the active substance slurry (20) on the surface of the current collector (10) adhered with the gummed paper (30), and rolling and baking to obtain a pole piece (100);
and removing the gummed paper (30), and forming a hollow foil area (13) on the pole piece (100) at the preset position (12).
2. A method of manufacturing a pole piece as claimed in claim 1, characterized in that the empty foil area (13) is spaced from the coating area (11) of the active substance paste (20).
3. A method of manufacturing a pole piece as claimed in claim 2, wherein the pole piece (100) is cut along its length (c) to obtain a plurality of individual pole pieces (40).
4. A method for preparing a pole piece according to any one of claims 1 to 3, further comprising cutting a plurality of tabs (131) along the empty foil area (13) to obtain the multi-tab pole piece (100).
5. A method of manufacturing a pole piece according to claim 1, wherein the adhesive paper (30) comprises a base layer (31) and an adhesive layer (32), and the adhesive layer (32) connects the base layer (31) and the current collector (10).
6. A method of manufacturing a pole piece as claimed in claim 5 wherein the base layer (31) is PET and the adhesive layer (32) is an acrylate polymer.
7. The preparation method of the pole piece according to any one of claims 1 and 5 to 6, wherein the thickness of the adhesive paper (30) is 8 to 20 μm.
8. A method for preparing a pole piece according to claim 1, characterized in that the width (b) of the predetermined position (12) is greater than the width (a) of the adhesive paper (30).
9. A pole piece is characterized by being prepared by the pole piece preparation method of any one of claims 1 to 8.
10. An electrical core, comprising a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, wherein the positive electrode plate and/or the negative electrode plate is the electrode plate of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768219.0A CN115050928A (en) | 2022-07-01 | 2022-07-01 | Pole piece preparation method, pole piece and battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768219.0A CN115050928A (en) | 2022-07-01 | 2022-07-01 | Pole piece preparation method, pole piece and battery cell |
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| CN115050928A true CN115050928A (en) | 2022-09-13 |
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| CN202210768219.0A Pending CN115050928A (en) | 2022-07-01 | 2022-07-01 | Pole piece preparation method, pole piece and battery cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020107A (en) * | 2022-07-07 | 2022-09-06 | 中天超容科技有限公司 | Preparation method of pole piece, pole piece and capacitor |
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| CN115466581A (en) * | 2022-09-15 | 2022-12-13 | 珠海冠宇电池股份有限公司 | Adhesive paper, preparation method of adhesive paper and preparation method of lithium ion battery |
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