CN112687834B - Battery cell, manufacturing method of battery cell and battery - Google Patents
Battery cell, manufacturing method of battery cell and battery Download PDFInfo
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- CN112687834B CN112687834B CN202011559523.1A CN202011559523A CN112687834B CN 112687834 B CN112687834 B CN 112687834B CN 202011559523 A CN202011559523 A CN 202011559523A CN 112687834 B CN112687834 B CN 112687834B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The application provides a battery cell, a manufacturing method of the battery cell and a battery, wherein the battery cell comprises: the first electrode plate and the second electrode plate are alternately arranged to form a stacked core, the first electrode plate comprises a first sub-electrode plate and a second sub-electrode plate, and the first sub-electrode plate is positioned on at least one of two outermost layers of the stacked core; in the laminated core, a bonding layer is formed on the surface, close to the outer side, of the first sub-electrode plate, a first electrode material layer is arranged on the surface, close to the inner side, of the first sub-electrode plate, two opposite surfaces of the second sub-electrode plate are provided with the first electrode material layers, and two opposite surfaces of the second electrode plate are provided with second electrode material layers. This application can be alleviated because the wearing and tearing between electric core and the plastic-aluminum membrane corrode, and the plastic-aluminum membrane that leads to takes place damaged problem.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery cell, a manufacturing method of the battery cell and a battery.
Background
In the prior art, in the process of assembling the battery from the battery cell, a layer of aluminum-plastic film is usually coated outside the battery cell, however, since powder and foreign matters exist on the surface of the battery cell, the abrasion and corrosion between the battery cell and the aluminum-plastic film are easy to occur, and further the aluminum-plastic film is likely to be damaged.
Disclosure of Invention
The battery core, the manufacturing method of the battery core and the battery can solve the problem that the aluminum plastic film is damaged due to abrasion and corrosion between the battery core and the aluminum plastic film.
In order to achieve the above object, an embodiment of the present application provides an electrical core, including: a first electrode sheet and a second electrode sheet;
the first electrode plate and the second electrode plate are alternately arranged to form a stacked core, the first electrode plate comprises a first sub-electrode plate and a second sub-electrode plate, and the first sub-electrode plate is positioned on at least one of two outermost layers of the stacked core;
in the laminated core, an adhesive layer is formed on the surface, close to the outer side, of the first sub-electrode sheet, a first electrode material layer is arranged on the surface, close to the inner side, of the first sub-electrode sheet, two opposite surfaces of the second sub-electrode sheet are provided with the first electrode material layers, and two opposite surfaces of the second electrode sheet are provided with a second electrode material layer.
Optionally, the adhesive layer is a residual layer obtained after the protective layer on the surface of the first sub-electrode sheet is sublimated.
Optionally, the protective layer comprises inactive materials in the form of particles, and gaps are formed between the inactive materials in the protective layer, and the inactive materials can sublime when heated.
Optionally, before sublimation of the protective layer on the surface of the first sub-electrode sheet, the thickness of the protective layer ranges from 10 μm to 30 μm, and the thickness of the first electrode material layer on the surface of the first sub-electrode sheet ranges from 110 μm to 130 μm.
Optionally, the porosity of the bonding layer is greater than 40%, and the thickness of the bonding layer ranges from 1 μm to 5 μm.
In order to achieve the same object, the present application further provides a method for manufacturing a battery cell, including:
coating first electrode slurry on the first surface of a first current collector, and coating sublimable inactive slurry on the second surface of the first current collector to obtain a coated first current collector; respectively coating the first electrode slurry on two opposite surfaces of a second current collector to obtain the second current collector with a coating; respectively coating second electrode slurry on two opposite surfaces of the third current collector to obtain a third current collector with a coating;
performing rolling treatment on the first current collector with the coating to obtain a first sub-electrode slice; performing rolling treatment on the second current collector with the coating to obtain a second sub-electrode slice; performing rolling treatment on the coated third current collector to obtain a second electrode plate, wherein the first electrode plate comprises the first sub-electrode plate and the second sub-electrode plate;
alternately arranging the first electrode plates and the second electrode plates to form a stacked core, wherein the stacked core comprises two first sub-electrode plates which are respectively positioned at two ends of the stacked core, and the second surfaces of the first sub-electrode plates form the end surfaces of the stacked core;
and baking the stacked core at a preset temperature to obtain the battery core, wherein at the preset temperature, the inactive slurry on the second surface of the first sub-electrode plate is sublimated, and a bonding layer is formed on the end face of the stacked core.
Optionally, before baking the stacked core at the preset temperature, the method further includes:
and adhering adhesive tapes to the side parts of the stacked cores, wherein two ends of each adhesive tape are correspondingly adhered to the two first sub-electrode plates of the stacked cores respectively.
Optionally, before coating the second surface of the first current collector with the sublimable, non-active paste, the method further comprises:
mixing and stirring a sublimable inactive material and a binder to obtain the inactive slurry, wherein the inactive material comprises at least one of the following materials: azo compounds, sulfonyl hydrazide compounds, benzoic acid, oxalic acid, naphthalene pills, sulfur powder and urea.
Optionally, before the coating the first electrode slurry on the first surface of the first current collector, the method further comprises:
mixing and stirring a first active material, a binder and a conductive agent to obtain first electrode slurry;
before the coating of the second electrode slurry on the two opposite surfaces of the third current collector, respectively, the method further includes:
mixing and stirring a second active material, a binder and a conductive agent to obtain second electrode slurry;
wherein one of the first active material and the second active material is a positive electrode active material, and the other is a negative electrode active material.
In order to achieve the same purpose, the application also provides a battery, which comprises the battery core.
The embodiment of the application provides a cell, through the surperficial bonding coat that forms in the first sub-electrode piece outside, because the cushioning effect of bonding coat can effectually alleviate the wearing and tearing corruption between electric core and the plastic-aluminum membrane, and then reduces and leads to the plastic-aluminum membrane to take place damaged risk because the wearing and tearing corrode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a battery packaging apparatus provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery cell provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of the first sub-electrode sheet before the protective layer sublimates in the embodiment of the present application;
FIG. 4 is a schematic structural diagram of the first sub-electrode sheet after the protective layer is sublimated in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a second sub-electrode sheet in the embodiment of the present application;
FIG. 6 is a schematic structural diagram of a second electrode sheet in the embodiment of the present application;
fig. 7 is a flowchart of a method for manufacturing a battery cell according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 6, an electrical core provided in an embodiment of the present application includes: a first electrode sheet 100 and a second electrode sheet 200;
the first electrode sheet 100 and the second electrode sheet 200 are alternately arranged to form a stacked core, the first electrode sheet 100 includes a first sub-electrode sheet 110 and a second sub-electrode sheet 120, and the first sub-electrode sheet 110 is located on at least one of two outermost layers of the stacked core;
in the stacked core, an adhesive layer is formed on the surface of the first sub-electrode sheet 110 close to the outer side, a first electrode material layer 112 is disposed on the surface of the first sub-electrode sheet 110 close to the inner side, the first electrode material layers 112 are disposed on two opposite surfaces of the second sub-electrode sheet 120, and second electrode material layers 220 are disposed on two opposite surfaces of the second electrode sheet 200.
The battery cell can be a battery cell of a laminated lithium ion battery. One of the first and second electrode sheets 100 and 200 is a positive electrode sheet and the other is a negative electrode sheet, and accordingly, one of the first and second electrode material layers 112 and 220 is a positive electrode material layer and the other is a negative electrode material layer.
It should be noted that the first electrode sheet 100 is adapted to the shape of the second electrode sheet 200, for example, the shape and size of the first electrode sheet 100 are the same as those of the second electrode sheet 200. And in the stacked core, a membrane 300 is arranged between the adjacent first electrode plate 100 and the second electrode plate 200, so that the relative insulation between the adjacent electrode plates with different polarities is realized.
Specifically, the positive electrode sheet may be an outermost electrode sheet of the stacked core, or the negative electrode sheet may be an outermost electrode sheet of the stacked core.
The number of the first sub-electrode sheets 110 may be one or two, and when the number of the first sub-electrode sheets 110 is one, one outermost layer of the stacked cores is set as the first sub-electrode sheet 110; when the number of the first sub-electrode sheets 110 is two, both outermost layers of the stacked core are set as the first sub-electrode sheets 110.
The adhesive layer contains a binder, and the binder may include at least one of styrene-butadiene rubber (SBR), polyacrylic acid, polyurethane, polyvinyl alcohol, polyvinylidene fluoride (PVDF), and a copolymer of vinylidene fluoride and fluorinated olefin.
The forming process of the positive electrode material layer can be as follows: the positive active material, the binder and the conductive agent are mixed, and are stirred at a high speed to obtain a uniformly dispersed mixture, and the mixture is prepared into positive active material slurry by using the binder solvent. And uniformly coating the positive active material slurry on a positive current collector foil, and drying to obtain a positive material layer. Accordingly, the forming process of the anode material layer may be: the negative active material slurry is prepared by mixing a negative active material, a binder and a conductive agent, stirring at a high speed to obtain a uniformly dispersed mixture, and preparing the mixture into a negative active material slurry by using a binder solvent. And uniformly coating the negative active material slurry on a negative current collector foil, and drying to obtain a negative material layer.
The positive active material comprises one or a combination of a nickel-cobalt-manganese ternary material, a lithium iron phosphate material, a lithium cobaltate material, a lithium manganate material, a lithium nickelate material, a lithium-rich manganese-based material and active carbon. The negative active material comprises one or a combination of graphite, lithium titanate, a silicon-based material, hard carbon, a tin-based material, graphene and a carbon nano tube.
The conductive agent may include at least one of conductive carbon black (SP), ketjen black, acetylene black, graphite conductive agent (KS-6, KS-15, S-O, SEG-6), carbon fiber (VGCG), carbon Nanotube (CNT), and graphene.
The binder solvent may include one or a combination of N-methylpyrrolidone (NMP), N-Dimethylformamide (DMF), dimethylsulfoxide (DMSO), or water.
In this embodiment, through the surface formation tie coat in the first sub-electrode piece 110 outside, because the cushioning effect of tie coat can effectually alleviate the wearing and tearing corruption between electric core and the plastic-aluminum membrane, and then reduces because wearing and tearing corrode and lead to the plastic-aluminum membrane to take place damaged risk, simultaneously, can also promote the electrolyte of electric core and protect the liquid measure.
At present, in the manufacturing process of the battery cell of the laminated lithium ion battery, one more negative plate is required than one more positive plate in consideration of safety and practicability, so that the outmost layer of the battery cell is the negative plate. The outer side of the negative plate positioned on the outermost layer of the battery cell is generally required to be coated with a layer of electrode material the same as the inner side of the negative plate, however, the electrode material positioned on the outer side of the negative plate positioned on the outermost layer has no practical application, so that the weight of the battery cell is increased, the energy density of the battery cell is reduced, and on the other hand, more lithium ions are consumed due to the fact that the SEI film is generated on the outermost negative plate, so that the first effect of the battery cell is reduced, and the capacity of the battery cell is reduced. However, when the electrode material is applied to only one surface of the outermost negative electrode sheet, the negative electrode sheet is rolled up to the side where the electrode material is not applied during the roll-in process, and the electrode material on the surface of the negative electrode sheet is damaged. Based on this, in the prior art, the battery cell manufacturing process has to coat the two sides of the outermost negative electrode sheet with the same formula, the same weight and the same thickness, so that the stress generated by the extension of the two sides is offset when rolling, and the rolling phenomenon cannot occur. But this method causes the above problems.
Optionally, the adhesive layer is a residual layer obtained after the protective layer 113 on the surface of the first sub-electrode sheet 110 is sublimated, and the protective layer 113 is used for preventing the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 from being damaged in a rolling process.
Fig. 2 is a schematic structural view of the corresponding battery cell shown in fig. 1 before the protective layer 113 on the first sub-electrode sheet 110 is sublimated. Specifically, when the first electrode material layer 112 is coated on the surface of one side of the first sub-electrode sheet 110, the protective layer 113 may be coated on the surface of the other side of the first sub-electrode sheet 110 to ensure that both sides of the first sub-electrode sheet 110 are provided with coatings, and the first electrode material layer 112 and the protective layer 113 respectively located on both sides of the first sub-electrode sheet 110 may be adhered at the edge position of the first sub-electrode sheet 110, that is, the current collector of the first sub-electrode sheet 110 is coated by the first electrode material layer 112 and the protective layer 113. In this way, when the first sub-electrode sheet 110 with the coating is rolled, the stress generated by the extension of the two sides of the first sub-electrode sheet 110 is offset, so that the rolling phenomenon is avoided, and the damage of the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 is avoided. After the first and second electrode sheets 100 and 200 are rolled and the coatings on the surfaces of the first and second electrode sheets 100 and 200 are dried, the first and second electrode sheets 100 and 200 may be alternately stacked to form the stacked core, and then the stacked core may be baked to sublimate the protective layer 113 on the surface of the first sub-electrode sheet 110 to form the adhesive layer.
The forming process of the protective layer 113 may be: mixing the inactive material which is easy to be pyrolyzed and sublimated with the binder, stirring at a high speed to obtain a uniformly dispersed mixture, preparing the slurry of the material which is easy to be pyrolyzed and sublimated by using the binder solvent, uniformly coating the slurry on the surface of the first sub-electrode sheet 110, and drying to obtain the protective layer 113.
The inactive material easy to be pyrolyzed and sublimated comprises one or the combination of azo compounds, sulfonyl hydrazine compounds, benzoic acid, oxalic acid, naphthalene pills, sulfur powder and urea.
In this embodiment, by providing the protective layer 113 on the surface of the first sub-electrode sheet 110, in the process of rolling the first sub-electrode sheet 110, the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 can be prevented from being damaged, and at the same time, after the first electrode sheet 100 and the second electrode sheet 200 are stacked to form a stacked core, the protective layer 113 can be sublimated, so that the weight of the battery cell can be effectively reduced, and the energy density of the battery cell can be improved.
Optionally, the protective layer 113 includes an inactive material in a granular form, and gaps are formed between the inactive material in the protective layer 113, and the inactive material can sublimate when heated.
Specifically, the shape structure of the inactive material is particles or porous microspheres, and the particle size of the particles and the microspheres is 10 nm-100 μm.
In this embodiment, by using the granular inactive material and forming the gap on the protective layer 113, when the protective layer 113 is sublimated, the sublimation speed of the protective layer 113 can be increased, and at the same time, the sublimation thoroughness of the protective layer 113 can be increased.
Optionally, before the protective layer 113 on the surface of the first sub-electrode sheet 110 is sublimated, the thickness of the protective layer 113 ranges from 10 μm to 30 μm, and the thickness of the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 ranges from 110 μm to 130 μm.
Specifically, the thickness of the protective layer 113 is determined by several comparisons based on the condition that the thicknesses of the first electrode material layer 112 and the second electrode material layer 220 are kept unchanged, and in this range, after sublimation, the obtained battery cell is light in weight and has high energy density, and meanwhile, the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 is not damaged in the rolling process.
Due to the sublimation of the inactive material in the protective layer, the resulting residual layer has a higher porosity after sublimation of the inactive material. Specifically, under the condition that the thickness of the protective layer 113 ranges from 10 μm to 30 μm, the porosity of the bonding layer obtained after sublimation of the inactive material is greater than 40%, and the thickness of the bonding layer ranges from 1 μm to 5 μm.
In this embodiment, the thickness of the protective layer 113 is preferably selected so that the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 is not broken in the roll-pressing step while ensuring a light weight and a high energy density of the obtained battery cell.
Referring to fig. 7, a method for manufacturing a battery cell provided in an embodiment of the present application includes:
Since the first current collector 111 and the second current collector 121 both serve as current collectors of the first electrode tab 100, that is, the first current collector 111 and the second current collector 121 serve as current collectors of electrode tabs of the same polarity, the first current collector 111 and the second current collector 121 may be made of foils of the same material, for example, the first current collector 111 and the second current collector 121 may be made of copper foil or aluminum foil, and correspondingly, the third current collector 210 may also be made of copper foil or aluminum foil.
After the inactive material is coated on the first current collector 111, the inactive material layer forms a protective layer 113 on the surface of the first current collector 111, which is used for preventing the first electrode paste on the other side of the first current collector 111 from being damaged in a subsequent rolling process.
After the first electrode slurry is coated on the first current collector 111 or the second current collector 121, the first electrode slurry forms first electrode layers on the surfaces of the first current collector 111 and the second current collector 121, respectively. Correspondingly, after the second electrode paste is applied to the third current collector 210, the second electrode paste forms a second electrode layer on the surface of the third current collector 210.
specifically, the first current collector 111 may be a long current collector, and after the roll pressing process is performed on the coated first current collector 111, and after the slurry on the surface of the first current collector 111 is dried, the first current collector 111 may be cut to obtain at least two first sub-electrode sheets 110. Accordingly, the second current collector 121 may be a relatively long current collector, and after the roll pressing process is performed on the coated second current collector 121, and after the slurry on the surface of the second current collector 121 is dried, the second current collector 121 may be cut to obtain at least two second sub-electrode sheets 120. The third current collector 210 may be a relatively long current collector, and after the roll-pressing process is performed on the coated third current collector 210, and after the slurry on the surface of the third current collector 210 is dried, the third current collector 210 may be cut to obtain at least two third sub-electrode sheets. Thus, the efficiency of manufacturing the electrode sheet can be improved.
The method for manufacturing the battery cell provided in this embodiment is a method for manufacturing the battery cell provided in the foregoing embodiment.
In this embodiment, by providing the protective layer 113 on the surface of the first sub-electrode sheet 110, in the process of rolling the first sub-electrode sheet 110, the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 can be prevented from being damaged, and at the same time, after the first electrode sheet 100 and the second electrode sheet 200 are stacked to form a stacked core, the protective layer 113 can be sublimated, so that the weight of the battery cell can be effectively reduced, and the energy density of the battery cell can be improved.
Optionally, before the baking the stacked core at the preset temperature, the method further includes:
and adhering adhesive tapes 400 to the side parts of the stacked cores, wherein two ends of each adhesive tape 400 are correspondingly adhered to the two first sub-electrode sheets 110 of the stacked cores respectively.
Specifically, the adhesive tape 400 may be respectively adhered to two opposite sides of the stacked core, or the adhesive tape 400 may be respectively adhered to four sides of the stacked core, for example, please refer to fig. 1 and fig. 2, the adhesive tape 400 is respectively adhered to two opposite sides of the stacked core, two ends of the adhesive tape 400 are respectively adhered to two end surfaces of the stacked core, and the adhesive tape 400 is in an elastic stretching state.
In this embodiment, the adhesive tape 400 is disposed on the side wall of the stacked core, so that in the process of sublimating the protective layer 113 on the surface of the stacked core, due to the fixation of the adhesive tape 400, the first sub-electrode sheet 110 can be effectively prevented from being rolled up, and further, the problem that the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 is damaged in the process of sublimating the protective layer 113 is effectively prevented.
Optionally, before the coating of the sublimable inactive slurry on the second surface of the first current collector 111, the method further comprises:
mixing and stirring a sublimable inactive material and a binder to obtain the inactive slurry, wherein the inactive material comprises at least one of the following materials: azo compounds, sulfonyl hydrazine compounds, benzoic acid, oxalic acid, naphthalene pills, sulfur powder and urea.
Specifically, the binder solvent described in the above embodiment may be added to the mixture while mixing and stirring the inactive material and the binder.
In this embodiment, since the inactive materials are both characterized by being easily sublimable when heated, the use of the inactive materials is advantageous for sublimating the inactive materials after the stacked core is formed, thereby reducing the weight of the stacked core and improving the energy density of the battery cell.
Optionally, before the coating the first surface of the first current collector 111 with the first electrode paste, the method further includes:
mixing and stirring a first active material, a binder and a conductive agent to obtain first electrode slurry;
before the second electrode paste is coated on the two opposite surfaces of the third current collector 210, respectively, the method further includes:
mixing and stirring a second active material, a binder and a conductive agent to obtain second electrode slurry;
wherein one of the first active material and the second active material is a positive electrode active material, and the other is a negative electrode active material.
Specifically, the binder solvent described in the above embodiment may be added to the mixture while the first active material, the binder, and the conductive agent are mixed and stirred, and accordingly, the binder solvent described in the above embodiment may also be added to the mixture while the second active material, the binder, and the conductive agent are mixed and stirred.
By adopting the method, the first electrode slurry and the second electrode slurry can be prepared.
Optionally, the baking the stacked cores at the preset temperature includes:
and baking the stacked cores under the conditions that the temperature is less than 180 ℃ and the vacuum degree is more than 80Kpa.s.
In this embodiment, the stacked core is baked under the conditions of temperature less than 180 degrees celsius and vacuum greater than 80kpa.s, so that the protective layer 113 on the surface of the stacked core can be rapidly sublimated, and damage to the components in the stacked core due to excessive temperature can be avoided.
The following explains the manufacturing method of the battery cell with 8 specific embodiments, and at the same time, a relatively superior manufacturing method is determined by adjusting parameters in different embodiments.
The specific embodiment 1 specifically comprises the following steps:
(1) Manufacturing a first sub-electrode sheet 110P0:
mixing the ternary nickel-cobalt-manganese NCM serving as the positive electrode active substance, the PVDF serving as the binder and the conductive carbon black, and stirring at a high speed to obtain a uniformly dispersed mixture. In the mixture, the solid component contained 95% by weight of NCM, 2% by weight of PVDF as binder and 3% by weight of conductive carbon black. The mixture was made into positive electrode active material slurry using N-methylpyrrolidone as a solvent, and the solid content in the slurry was 70wt%. And uniformly coating the slurry on the single surface of the aluminum foil of the positive current collector, and drying to obtain the single-surface coating of the active material of the aluminum foil positive current collector, wherein the thickness of the coating is 120 mu m. Azodicarbonamide and a binder PVDF are mixed and stirred at high speed to obtain a uniformly dispersed mixture. In the mixture, the solid component contained 99% by weight of azodicarbonamide, 1% by weight of the binder PVDF. The mixture was made into a slurry of a porous polymer inactive material using N-methylpyrrolidone as a solvent, and the solid content in the slurry was 50wt%. And (3) uniformly coating the slurry on the other side of the single-sided coating aluminum foil current collector in the step (1), wherein the thickness of the coating is 20 microns, and drying and rolling to obtain the first sub-electrode sheet 110P0.
(2) Manufacturing a second sub-electrode sheet 120P1:
mixing the ternary nickel-cobalt-manganese NCM serving as the positive electrode active substance, the PVDF serving as the binder and the conductive carbon black, and stirring at a high speed to obtain a uniformly dispersed mixture. In the mixture, the solid component contained 95% by weight of NCM, 2% by weight of PVDF as binder and 3% by weight of conductive carbon black. The mixture was made into positive electrode active material slurry using N-methylpyrrolidone as a solvent, and the solid content in the slurry was 70wt%. The slurry is uniformly coated on both sides of the aluminum foil, and the second sub-electrode sheet 120P1 is obtained by drying and compacting with a roll press.
(3) Manufacturing a second electrode sheet 200N1:
the artificial graphite is used as an active substance, the SBR binder, the thickening agent sodium carboxymethyl cellulose and the conductive agent conductive carbon black are mixed, and the mixture containing the negative active substance is prepared by uniformly dispersing the mixture through high-speed stirring. In the mixture, the solid component comprises 95wt% of artificial graphite, 1.5wt% of sodium carboxymethyl cellulose, 1.5wt% of conductive carbon black Super-P and 2wt% of binder. Deionized water is used as a solvent to prepare cathode active substance slurry, and the solid content of the slurry is 50wt%. The slurry is uniformly coated on one side of the copper foil of the negative current collector, and the second electrode plate 200N1 is obtained after drying and compaction by a roll squeezer, wherein the thickness of the coating is 130 mu m.
(4) Assembling the battery:
punching the first sub-electrode plate 110P0, the second sub-electrode plate 120P1 and the second electrode plate 200N1, forming a bare cell laminated core by adopting Z-shaped lamination, fixing the laminated core by using adhesive paper, carrying out heat treatment on the laminated core, wherein the vacuum degree of the heat treatment is-80 KPa & s, the temperature is 110 ℃, the baking time is 10min, and then respectively rolling out an aluminum tab and a copper nickel-plated tab. And clamping the bare cell by using a glass clamp, wherein the strength of the glass clamp is 100MPa/m & lt 2 & gt, vacuum baking the bare cell for 24 hours at the high temperature of 85 ℃, and packaging the bare cell by using an aluminum-plastic film. The electrolyte is a lithium hexafluorophosphate electrolyte containing 1M, and the solvent is a mixed solvent of ethylene carbonate/dimethyl carbonate/1, 2 propylene carbonate-1. After packaging, the battery is fully electrified (pre-embedded with lithium) and aged to obtain a square flexible package battery with the length, width and thickness of 160mm multiplied by 60mm multiplied by 10mm, which is marked as C1.
Specific example 2:
the difference between embodiment 2 and embodiment 1 is that: the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 is changed from a positive electrode material layer to a negative electrode material layer, and the specific preparation method is as follows:
the artificial graphite is used as an active substance, the SBR binder, the thickener sodium carboxymethyl cellulose and the conductive carbon black are mixed, and the mixture containing the negative active substance is obtained by high-speed stirring and uniform dispersion. In the mixture, the solid component comprises 95wt% of artificial graphite, 1.5wt% of sodium carboxymethyl cellulose, 1.5wt% of conductive carbon black Super-P and 2wt% of binder. Deionized water is used as a solvent to prepare cathode active substance slurry, and the solid content of the slurry is 50wt%. And uniformly coating the slurry on the single surface of the copper foil, and drying to obtain the active material single-surface coating negative plate. The azodicarbonamide inactive material and SBR adhesive are mixed and stirred at high speed to obtain a uniformly dispersed mixture. In the mixture, the solid component comprises 98wt% of azodicarbonamide, 1wt% of SBR binder and 1wt% of thickening agent sodium carboxymethyl cellulose. The mixture was made into azodicarbonamide inactive material slurry using water as a solvent, the solid content in the slurry was 45wt%. And uniformly coating the slurry on the other side of the single-side coated copper foil current collector, wherein the thickness of the coating is 20 micrometers, and drying and rolling to obtain the first sub-electrode plate 110N0.
The battery obtained by assembling the first sub-electrode sheet 110N0, the second sub-electrode sheet 120P1, and the second electrode sheet 200N1 is C2.
Specific example 3:
the specific embodiment 3 is different from the specific embodiment 1 in that: the inactive material azodicarbonamide is changed into a naphthalene pill inactive material, and the prepared battery is C3.
Specific example 4:
embodiment 4 differs from embodiment 2 in that: the inactive material azodicarbonamide is changed into a naphthalene pill inactive material, and the prepared battery is C4.
Specific example 5:
embodiment 5 differs from embodiment 1 in that: the thickness of the azodicarbonamide inactive material coating was changed from 20 μm to 5 μm, and the resulting battery was C5.
Specific example 6:
embodiment 6 differs from embodiment 1 in that: the thickness of the azodicarbonamide inactive material coating was changed from 20 μm to 10 μm, and the resulting battery was C6.
Specific example 7:
embodiment 7 differs from embodiment 1 in that: the thickness of the azodicarbonamide inactive material coating was changed from 20 μm to 100 μm, and the resulting battery was C7.
Specific example 8:
comparative example 8 differs from specific example 1 in that: the pole piece of the active material/azodicarbonamide inactive material at the outermost layer of the laminated structure is changed into conventional 130 mu m negative electrode graphite/130 mu m negative electrode graphite, and the prepared battery is C8.
Table 1 shows the rolling condition of the first sub-electrode sheet 110 in the battery cell with the C1, C2, C3, C4, C5, C6, C7 and C8 lamination structure in the rolling process and the data table of the weight, the first effect, the gram capacity and the energy density of the battery cell, for the coating of the material which is easy to pyrolyze and sublimate and is not active, when the thickness of the coating is 20 μm, the stresses on both sides of the foil of the positive electrode or the negative electrode almost cancel each other out, and the phenomenon of rolling, rolling and breaking of the electrode sheet can not occur. The outermost layer of the laminated core is finished by a copper foil or an aluminum foil, so that the consumption of active lithium is reduced when an unused graphite layer of the outermost layer of the conventional laminated core is subjected to SEI film forming, the first effect of the battery cell is improved by 1%, and the gram capacity of the positive active substance is improved by 2-3 mAh/g. Compared with the conventional lithium ion battery C8 with a laminated structure, the coating with the thickness of 20 microns, which is easy to dissipate heat and sublimate the inactive material, has the advantages that the weight of the battery cell is reduced by 5 percent, the weight energy density of the battery with the outer layer and the single-side coating laminated structure is improved by 6 percent due to the reduction of the first effect and the weight of the battery cell, and the structural utilization rate of the battery cell with the laminated structure is greatly improved.
The embodiment of the application also provides a battery, which comprises the battery core.
In this embodiment, by providing the protective layer 113 on the surface of the first sub-electrode sheet 110, in the process of rolling the first sub-electrode sheet 110, the first electrode material layer 112 on the surface of the first sub-electrode sheet 110 can be prevented from being damaged, and at the same time, after the first electrode sheet 100 and the second electrode sheet 200 are stacked to form a stacked core, the protective layer 113 can be sublimated, so that the weight of the battery cell can be effectively reduced, and the energy density of the battery cell can be improved.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for manufacturing a battery cell is characterized by comprising the following steps:
coating first electrode slurry on the first surface of a first current collector, and coating sublimable inactive slurry on the second surface of the first current collector to obtain a coated first current collector; respectively coating the first electrode slurry on two opposite surfaces of a second current collector to obtain the second current collector with a coating; respectively coating second electrode slurry on two opposite surfaces of the third current collector to obtain a third current collector with a coating;
performing rolling treatment on the first current collector with the coating to obtain a first sub-electrode slice; performing rolling treatment on the second current collector with the coating to obtain a second sub-electrode slice; performing roll-in treatment on the coated third current collector to obtain a second electrode plate, wherein the first electrode plate comprises a first sub-electrode plate and a second sub-electrode plate;
alternately arranging the first electrode plates and the second electrode plates to form a stacked core, wherein the stacked core comprises two first sub-electrode plates which are respectively positioned at two ends of the stacked core, and the second surfaces of the first sub-electrode plates form the end surfaces of the stacked core;
and baking the stacked core at a preset temperature to obtain the battery core, wherein at the preset temperature, the inactive slurry on the second surface of the first sub-electrode plate is sublimated, and a bonding layer is formed on the end face of the stacked core.
2. The method of claim 1, wherein prior to baking the stack of cores at the predetermined temperature, the method further comprises:
and adhering adhesive tapes to the side parts of the stacked cores, wherein two ends of each adhesive tape are correspondingly adhered to the two first sub-electrode plates of the stacked cores respectively.
3. The method of claim 1, wherein prior to coating the second surface of the first current collector with the sublimable, non-reactive slurry, the method further comprises:
mixing and stirring a sublimable inactive material and a binder to obtain the inactive slurry, wherein the inactive material comprises at least one of the following materials: azo compounds, sulfonyl hydrazine compounds, benzoic acid, oxalic acid, naphthalene pills, sulfur powder and urea.
4. The method of claim 1, wherein prior to coating the first surface of the first current collector with the first electrode paste, the method further comprises:
mixing and stirring a first active material, a binder and a conductive agent to obtain first electrode slurry;
before the coating of the second electrode slurry on the two opposite surfaces of the third current collector, respectively, the method further includes:
mixing and stirring a second active material, a binder and a conductive agent to obtain second electrode slurry;
wherein one of the first active material and the second active material is a positive electrode active material, and the other is a negative electrode active material.
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| JPH07262986A (en) * | 1994-03-25 | 1995-10-13 | Fuji Elelctrochem Co Ltd | Non-aqueous electrolyte battery and manufacture thereof |
| KR20180085139A (en) * | 2017-01-18 | 2018-07-26 | 주식회사 엘지화학 | Electrode Assembly with Insulation Coating layer and Secondary Battery Cell Having the Same |
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| JP3440705B2 (en) * | 1996-08-01 | 2003-08-25 | 松下電器産業株式会社 | Manufacturing method of non-aqueous electrolyte secondary battery |
| JP4100188B2 (en) * | 2003-02-18 | 2008-06-11 | 日産自動車株式会社 | Bipolar battery |
| JP4527190B1 (en) * | 2009-01-14 | 2010-08-18 | パナソニック株式会社 | Non-aqueous battery positive electrode plate, non-aqueous battery electrode group and manufacturing method thereof, and rectangular non-aqueous secondary battery and manufacturing method thereof |
| CN106684319A (en) * | 2016-12-23 | 2017-05-17 | 国联汽车动力电池研究院有限责任公司 | Single-surface similar pole plate, light battery cell containing same and preparation method of single-surface similar pole plate |
| CN110534702A (en) * | 2018-05-26 | 2019-12-03 | 深圳格林德能源有限公司 | A kind of lithium ion battery silicon negative electrode tab |
| CN208478466U (en) * | 2018-07-13 | 2019-02-05 | 柔电（武汉）科技有限公司 | A kind of ultra-thin battery core and ultrathin lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07262986A (en) * | 1994-03-25 | 1995-10-13 | Fuji Elelctrochem Co Ltd | Non-aqueous electrolyte battery and manufacture thereof |
| KR20180085139A (en) * | 2017-01-18 | 2018-07-26 | 주식회사 엘지화학 | Electrode Assembly with Insulation Coating layer and Secondary Battery Cell Having the Same |
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