CN115986223A - Winding type battery cell and battery - Google Patents
Winding type battery cell and battery Download PDFInfo
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- CN115986223A CN115986223A CN202211558969.1A CN202211558969A CN115986223A CN 115986223 A CN115986223 A CN 115986223A CN 202211558969 A CN202211558969 A CN 202211558969A CN 115986223 A CN115986223 A CN 115986223A
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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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- 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 application relates to the technical field of batteries, in particular to a winding type battery cell and a battery. According to the invention, a first active coating and a second active coating are respectively arranged on two sides of a current collector of a negative plate or a positive plate, and the first active coating is arranged on the surface of one side of the current collector close to a curling center; the second active coating sets up in the mass flow body and keeps away from the surface of curling center one side, and when the resistance of first active coating was greater than the resistance of second active coating, can make the electric conductivity of second active coating be greater than the electric conductivity of first active coating, the high electric conductivity of second active coating is favorable to promoting its dynamic property to can effectively keep the long-term battery capacity who circulates of coiling formula battery, and then improve the problem of analysing lithium, prolong the life of battery.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a winding type battery core and a battery.
Background
In recent years, with the continuous emergence of consumer electronics products such as smart phones, tablet computers, electronic bracelets and the like and the rapid growth of the market of electric vehicle products, lithium ion batteries as power sources of the products are receiving more and more attention. The service life of the lithium ion battery is therefore of great importance.
For a winding type structure battery cell, because the circumferences of all circles of the winding type battery cell are different, negative active substances corresponding to two sides of a surface arc on one side of the same folded negative plate close to the curling center are not balanced, so that the problems of lithium precipitation of the battery cell, capacity attenuation of a long-term circulation battery, circulation failure and the like are caused, and the service life of the battery is seriously influenced.
Therefore, it is desirable to provide a solution to the problem of long-term cycling capacity fading of wound batteries.
Disclosure of Invention
In view of the above, the invention provides a winding type battery cell and a battery. The winding type battery cell can effectively keep the battery capacity of long-term circulation, so that the problem of lithium precipitation is solved, and the service life of the battery is prolonged.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a winding type battery cell, which comprises a coiled negative plate and a coiled positive plate;
the negative plate comprises a first negative active coating, a current collector and a second negative active coating which are sequentially arranged; the first negative active coating is arranged on the surface of one side of the current collector close to the curling center; the second negative active coating is arranged on the surface of one side, away from the curling center, of the current collector; the resistance of the first negative active coating is greater than the resistance of the second negative active coating;
the positive plate comprises a first positive active coating, a current collector and a second positive active coating which are sequentially arranged; the first positive active coating is arranged on the surface of one side, close to the curling center, of the current collector; the second positive active coating is arranged on the surface of one side of the current collector, which is far away from the curling center; the resistance of the first positive active coating is greater than the resistance of the second positive active coating.
Preferably, the resistance of the first negative electrode active coating layer is 1 to 10 Ω.
Preferably, the second negative electrode active coating layer has a resistance of 0.1 to 5 Ω.
Preferably, the first positive electrode active coating layer has a resistance of 500 to 3000 Ω.
Preferably, the second positive electrode active coating layer has a resistance of 100 to 1000 Ω.
In the embodiment provided by the invention, the resistance of the first negative electrode active coating layer is larger than that of the second negative electrode active coating layer, and the resistance can be regulated and controlled by at least one of the following modes:
(1) The porosity of the first negative active coating is less than the porosity of the second negative active coating; preferably, the porosity of the first negative active coating is 25% to 40%, and the porosity of the second negative active coating is 25% to 40%;
(2) The conductive agent content of the first negative electrode active coating is less than that of the second negative electrode active coating; preferably, the conductive agent content of the first negative active coating is 0.5wt% to 15wt%, and the conductive agent content of the second negative active coating is 0.5wt% to 15wt%;
(3) The conductive agents of the first negative active coating and the second negative active coating are tubular conductive agents, and the length of the tube wall of the conductive agent of the first negative active coating is smaller than that of the tube wall of the conductive agent of the second negative active coating; preferably, the length of the conductive agent pipe wall of the first negative active coating is 10-25 nm, and the length of the conductive agent pipe wall of the second negative active coating is 10-25 nm;
(4) The graphite orientation index of the first negative active coating is greater than the graphite orientation index of the second negative active coating; preferably, the graphite orientation index of the first negative active coating is 1 to 5, and the graphite orientation index of the second negative active coating is 1 to 5;
the graphite orientation index is: the ratio of the peak intensity of graphite in the 004 crystal plane and the peak intensity of graphite in the 110 crystal plane in X-ray diffraction;
(5) The compacted density of the first negative active coating is greater than the compacted density of the second negative active coating; preferably, the first negative active coating layer has a compacted density of 1.2 to 1.8g/cm 3 The compacted density of the second negative active coating is 1.2-1.8 g/cm 3 ；
The resistance of the first positive electrode active coating is larger than that of the second positive electrode active coating, and the resistance is regulated and controlled in at least one mode of:
(1) The porosity of the first positive active coating is less than the porosity of the second positive active coating; preferably, the porosity of the first positive active coating is 15-30%, and the porosity of the second positive active coating is 15-30%;
(2) The conductive agent content of the first positive electrode active coating is less than that of the second positive electrode active coating; preferably, the conductive agent content of the first positive active coating is 0.5wt% -15 wt%, and the conductive agent content of the second positive active coating is 0.5wt% -15 wt%;
(3) The conductive agents of the first positive electrode active coating and the second positive electrode active coating are tubular conductive agents, and the length of the pipe wall of the conductive agent of the first positive electrode active coating is smaller than that of the pipe wall of the conductive agent of the second positive electrode active coating; preferably, the length of the conductive agent pipe wall of the first positive active coating is 10-25 nm, and the length of the conductive agent pipe wall of the second positive active coating is 10-25 nm;
(4) The compacted density of the first positive active coating layer is greater than the compacted density of the second positive active coating layer; preferably, the compacted density of the first positive active coating layer is 3.4 to 4.3g/cm 3 The compacted density of the second positive active coating is 3.4-4.3 g/cm 3 。
Preferably, the first negative active coating layer or the second negative active coating layer includes:
75-99.8 wt% of negative active material;
0.5 to 15 weight percent of conductive agent;
0.5 to 15 weight percent of binder.
Preferably, in the first negative electrode active coating layer or the second negative electrode active coating layer,
the negative active material is independently selected from one or more of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon and hard carbon;
the conductive agent is independently selected from one or more of conductive carbon black, carbon fiber, ketjen black, acetylene black, carbon nanotube, graphene, ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, metal powder and carbon fiber;
the binder is independently selected from one or more of Styrene Butadiene Rubber (SBR), polyacrylic acid, polyurethane, polyvinyl alcohol, polyvinylidene fluoride (PVDF), and vinylidene fluoride-fluorinated olefin copolymer.
Preferably, the first positive electrode active coating or the second positive electrode active coating comprises:
75-99.8 wt% of positive active material;
0.5 to 15 weight percent of conductive agent;
0.5 to 15 weight percent of binder.
Preferably, in the first positive electrode active coating layer or the second positive electrode active coating layer,
the positive active material is selected from one or more of nickel cobalt manganese, lithium iron phosphate, nickel cobalt aluminum, lithium cobaltate and lithium manganate independently;
the conductive agent is independently selected from one or more of conductive carbon black, ketjen black, conductive fiber, conductive polymer, acetylene black, carbon nanotube, graphene, crystalline flake graphite, conductive oxide and metal particles;
the binder is independently selected from one or more of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene and styrene butadiene rubber.
The types of the negative electrode active material, the positive electrode active material, the conductive agent, and the binder are not limited thereto, and those recognized by those skilled in the art are within the scope of the present invention.
In the present invention, the first negative electrode active coating, the second negative electrode active coating, the first positive electrode active coating, or the second positive electrode active coating may include other functional components recognized in the art in addition to the above-described components.
Preferably, the thickness of the first negative electrode active coating layer is 20 to 75 μm.
Preferably, the thickness of the second anode active coating layer is 20 to 75 μm.
Preferably, the thickness of the first positive active coating layer is 20 to 75 μm.
Preferably, the thickness of the second positive electrode active coating layer is 20 to 75 μm.
In the embodiment provided by the invention, the current collector used by the negative electrode is selected from one or more of copper foil, carbon-coated copper foil and perforated copper foil.
In the embodiment provided by the invention, the current collector used by the positive electrode is selected from one or more of aluminum foil, carbon-coated aluminum foil and perforated aluminum foil.
In the embodiment provided by the invention, the winding type battery cell further comprises one or more of a positive electrode tab, a negative electrode tab and a diaphragm.
In some embodiments, the separator is selected from one or both of polyethylene or polypropylene.
In the embodiment provided by the invention, the winding type battery cell can be a conventional winding core structure, a tab-in-core winding core structure, an electrodeless tab winding core structure, a tripolar tab winding core structure, a multi-tab winding core structure and the like.
The invention also provides a battery, which comprises the winding type battery cell.
According to an embodiment of the invention, the battery further comprises an electrolyte and/or a casing.
In some embodiments, the electrolyte is a nonaqueous electrolyte comprising a nonaqueous organic solvent and a lithium salt.
In some embodiments, the non-aqueous organic solvent is selected from one or more of Ethylene Carbonate (EC), propylene Carbonate (PC), diethyl carbonate (DEC), fluoroethylene carbonate (FEC), dimethyl carbonate (DMC), ethyl Methyl Carbonate (EMC), ethylene carbonate, γ -butyrolactone, propyl methyl carbonate, ethyl propionate.
In some embodiments, the lithium salt is selected from LiPF 6 、LiBF 4 、LiSbF 6 、LiClO 4 、LiCF 3 SO 3 、LiAlO 4 、LiAlCl 4 、Li(CF 3 SO 2 ) 2 N, liBOB and LiDFOB.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a first active coating and a second active coating are respectively arranged on two sides of a current collector of a negative plate or a positive plate, and the first active coating is arranged on the surface of one side of the current collector close to a curling center; the second active coating sets up in the mass flow body and keeps away from the surface of curling center one side, and when the resistance of first active coating was greater than the resistance of second active coating, can make the electric conductivity of second active coating be greater than the electric conductivity of first active coating, the high electric conductivity of second active coating is favorable to promoting its dynamic property to can effectively keep the long-term battery capacity who circulates of coiling formula battery, and then improve the problem of analysing lithium, prolong the life of battery.
Drawings
FIG. 1 is a schematic structural diagram of a negative electrode sheet;
FIG. 2 is a schematic structural view of a positive plate;
FIG. 3 is a schematic view of a conventional jelly roll structure;
fig. 4 is a schematic view of a structure of a core with a tab disposed therein;
figure 5 is a comparison of cycle life of wound cells.
Description of reference numerals:
1, negative pole piece; 1-1, a negative current collector; 1-2 a first negative active coating; 1-3 a second negative active coating;
2, positive plate; 2-1, a positive current collector; 2-2 a first positive active coating; 2-3 a second positive active coating;
3. a positive tab;
4. a negative tab;
5. a diaphragm.
Detailed Description
The invention discloses a winding type battery cell and a battery, and a person skilled in the art can appropriately improve process parameters for realization by referring to the content. It is specifically noted that all such substitutions and modifications will be apparent to those skilled in the art and are intended to be included herein. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
Interpretation of terms:
resistance: the resistance impedance of the pole piece tested on the thickness is measured; .
Graphite orientation index (OI value): it can be expressed as the degree of orientation of the particles of graphite material in the pole piece at the pole piece level, and the OI value affects the cycle performance and cycle expansion rate.
Porosity: refers to the percentage of the pore volume in the bulk material to the total volume of the material in its natural state.
Compacting density: in the manufacturing process of the lithium ion power battery, the compaction density has great influence on the performance of the battery. The calculation method comprises the following steps: compacted density = areal density/thickness of material.
There are two main methods for testing the coating, and the following are only exemplary, and there may be other more suitable methods;
the first method is a membrane resistance test method: taking a pole piece comprising the first coating and the second coating, testing the thickness D 'of the pole piece, directly carrying out the testing R' of the diaphragm resistance by using a diaphragm resistance meter, scraping the pole piece comprising the second coating, and testing the thickness D 'of the pole piece and the diaphragm resistance R' again, wherein for the second coating, the thickness D is D, and the resistance R2= (R '÷ R')/(D '÷ D') × D of the second coating is obtained;
the second test method is to assemble the power buckle to carry out the test of alternating current impedance (EIS), and the obtained alternating current impedance spectrum is compared with the impedance Rs at the first intersection point of the real axis to carry out the impedance comparison. The test process is similar to the test method, and the only difference is that the pole piece test is directly carried out, and the pole piece is assembled into a power failure to carry out EIS test.
The chemical components or materials and the like used in the present invention are commercially available.
The invention is further illustrated by the following examples:
example 1 wound cell
1. Structure and composition
The winding type battery cell of the embodiment comprises a coiled negative plate 1, a coiled positive plate 2, a positive tab 3, a negative tab 4 and a diaphragm 5.
(1) Negative plate
As shown in fig. 1, the negative electrode sheet 1 includes a negative electrode current collector 1-1, a first negative electrode active coating 1-2, and a second negative electrode active coating 1-3; the first negative active coating is arranged on the surface of one side, close to the curling center, of the negative current collector; the second negative active coating is arranged on the surface of one side, away from the curling center, of the negative current collector.
The resistance of the first negative active coating layer is greater than the resistance of the second negative active coating layer. The resistance of the first negative active coating is 1 to 10 omega, and the resistance of the second negative active coating is 0.1 to 5 omega.
The first negative active coating layer includes: 96.5wt% of active substance (artificial graphite), 1.5wt% of conductive agent (conductive carbon black), 2wt% of binder (sodium carboxymethylcellulose). The first negative active coating layer had a compacted density of 1.68g/cm 3 The thickness was 35 μm.
The second negative active coating layer includes: 96.5wt% of active substance (artificial graphite), 2.3wt% of conductive agent (conductive carbon black), 1.2wt% of binder (sodium carboxymethylcellulose). The second negative active coating layer had a compacted density of 1.55g/cm 3 The thickness was 35 μm.
(2) Positive plate
As shown in fig. 2, the positive plate 2 includes a positive current collector 2-1, a first positive active coating 2-2 and a second positive active coating 2-3; the first positive active coating is arranged on the surface of one side, close to the curling center, of the positive current collector; the second positive active coating is arranged on the surface of one side, away from the curling center, of the positive current collector.
The resistance of the first positive active coating layer is greater than the resistance of the second positive active coating layer. The resistance of the first positive active coating is 500-3000 omega, and the resistance of the second positive active coating is 100-1000 omega.
The first positive electrode active coating layer includes: 97wt% of an active material (lithium cobaltate material), 1wt% of a conductive agent (acetylene black), 2wt% of a binder (polyvinylidene fluoride). The compacted density of the first positive active coating layer is 4.15g/cm 3 The thickness was 30 μm.
The second positive electrode active coating layer includes: 97wt% of active material (lithium cobaltate material), 1.8wt% of conductive agent (acetylene black), 1.2wt% of binder (polyvinylidene fluoride). The compacted density of the second positive electrode active coating layer is 4g/cm 3 The thickness was 30 μm.
2. Preparation process
(1) Preparing a positive plate:
a. respectively and uniformly coating the slurry of the first positive electrode active material layer and the slurry of the second positive electrode active material layer on two surfaces of the aluminum foil, wherein the first active material layer is positioned on the surface of one side, close to the center of the winding core, in the current collector, and the second active material layer is positioned on the surface of one side, far away from the center of the winding core, in the current collector;
b. and drying the coated copper foil, and then rolling and slitting to obtain the positive plate.
(2) Preparing a negative plate: the same as the positive electrode sheet.
(3) And winding the positive plate, the negative plate and the diaphragm into a winding core.
(4) After being packaged into a shell, the battery cell is obtained after baking, liquid injection, formation, sorting and OCV.
As shown in fig. 3, the winding type battery cell of the present embodiment is a conventional winding core structure.
The technical scheme is also suitable for a core structure (shown in fig. 4) in the middle of the tab and other core structures formed by winding (such as a core structure without the tab, a core structure with the three tabs, a core structure with multiple tabs and the like).
Comparative example 1 wound cell
Compared with example 1, the comparative example has differences in resistance, formulation and compacted density, and is detailed in table 1:
TABLE 1
Test example 1 cycle life test
And packaging the battery cell of the example 1 and the battery cell of the comparative example 1 by using an aluminum plastic film, baking to remove moisture, injecting electrolyte, and forming to obtain the lithium ion battery.
The preparation method of the electrolyte comprises the following steps: propylene carbonate, ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate were mixed in a weight ratio of 1 6 Obtaining an electrolyte solution in which LiPF 6 The concentration of (2) is 1mol/L.
The cycle life comparison of the prepared lithium ion battery is carried out, and the cycle retention rate test mode at 45 ℃ is as follows: the charging mode is 3.0C-4.25V (cut off 2.0C) to 2.0C-4.30V (cut off 1.5C) to 1.5C-4.45V (cut off 0.025C), the discharging mode is 0.7C discharging, and the test is carried out for 600 circles.
As a result, as shown in fig. 5, the capacity retention rate was 92.4% at 500 cycles in example 1, and 84.2% at 500 cycles in comparative example 1. It can be seen that example 1 has a capacity retention rate 8.2% higher than comparative example 1 at 500 cycles and no cycle failure.
Example 2 and comparative example 2 wound cells
The resistance, formula, porosity and compacted density of the positive electrode and the negative electrode of the example 2 are different from those of the comparative example 2, and the preparation method of the pole piece is the same as that of the example 1 in the table 2.
Example 2 and comparative example 2 the capacity retention at 45 ℃ at 500 cycles was 88.5% and the capacity retention at 500 cycles was 82.8% for comparative example 2, according to the test method of test example 1. It can be seen that example 2 has a capacity retention rate at 500 cycles 5.7% higher than comparative example 1, and has no cycle failure.
TABLE 2
Example 3 and comparative example 3 wound cells
The positive and negative electrode resistances, the formulas, the lengths of the positive and negative electrode conductive agent tube walls, and the orientation of the negative electrode graphite in example 3 and comparative example 3 are different, and specifically, as shown in table 3, the preparation method of the electrode sheet is the same as that in example 1.
Example 3 and comparative example 3 the capacity retention at 45 ℃ at 500 cycles was 85.2% and the capacity retention at 500 cycles was 80.6% for comparative example 1, according to the test method of test example 1. It can be seen that example 3 has a capacity retention rate of 4.6% higher than comparative example 3 at 500 cycles and no cycle failure.
TABLE 3
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A coiled battery cell is characterized in that the coiled battery cell comprises a coiled negative plate and a coiled positive plate;
the negative plate comprises a first negative active coating, a current collector and a second negative active coating which are sequentially arranged; the first negative active coating is arranged on the surface of one side, close to the curling center, of the current collector; the second negative active coating is arranged on the surface of one side of the current collector, which is far away from the curling center; the resistance of the first negative active coating is greater than the resistance of the second negative active coating;
and/or the positive plate comprises a first positive active coating, a current collector and a second positive active coating which are sequentially arranged; the first positive active coating is arranged on the surface of one side, close to the curling center, of the current collector; the second positive active coating is arranged on the surface of one side of the current collector, which is far away from the curling center; the resistance of the first positive active coating layer is greater than the resistance of the second positive active coating layer.
2. The wound electrical core according to claim 1, wherein the resistance of the first negative active coating is 1 to 10 Ω, and the resistance of the second negative active coating is 0.1 to 5 Ω;
the resistance of the first positive active coating is 500-3000 omega, and the resistance of the second positive active coating is 100-1000 omega.
3. The wound cell of claim 1, wherein the resistance of the first negative active coating is greater than the resistance of the second negative active coating, and is controlled by at least one of:
(1) The porosity of the first negative active coating is less than the porosity of the second negative active coating;
(2) The conductive agent content of the first negative electrode active coating is less than that of the second negative electrode active coating;
(3) The conductive agents of the first negative active coating and the second negative active coating are tubular conductive agents, and the length of the tube wall of the conductive agent of the first negative active coating is smaller than that of the tube wall of the conductive agent of the second negative active coating;
(4) The graphite orientation index of the first negative active coating is greater than the graphite orientation index of the second negative active coating;
(5) The compacted density of the first negative active coating is greater than the compacted density of the second negative active coating;
the resistance of the first positive active coating is larger than that of the second positive active coating, and the resistance is regulated and controlled in at least one of the following modes:
(1) The porosity of the first positive active coating is less than the porosity of the second positive active coating;
(2) The conductive agent content of the first positive electrode active coating is less than that of the second positive electrode active coating;
(3) The conductive agents of the first positive active coating and the second positive active coating are tubular conductive agents, and the length of the conductive agent pipe wall of the first positive active coating is smaller than that of the conductive agent pipe wall of the second positive active coating;
(4) The first positive electrode active coating layer has a compacted density greater than that of the second positive electrode active coating layer.
4. The wound cell of claim 1, wherein the first or second negative active coating comprises:
75-99.8 wt% of negative active material;
0.5 to 15 weight percent of conductive agent;
0.5 to 15 weight percent of binder.
5. The wound cell of claim 4, wherein the first negative active coating or the second negative active coating,
the negative active material is independently selected from one or more of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon and hard carbon;
the conductive agent is independently selected from one or more of conductive carbon black, carbon fiber, ketjen black, acetylene black, carbon nanotube, graphene, ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, metal powder and carbon fiber;
the binder is independently selected from one or more of styrene butadiene rubber, polyacrylic acid, polyurethane, polyvinyl alcohol, polyvinylidene fluoride and vinylidene fluoride-fluorinated olefin copolymer.
6. The wound cell of claim 1, wherein the composition of the first or second positive active coating comprises:
75-99.8 wt% of positive active material;
0.5 to 15 weight percent of conductive agent;
0.5 to 15 weight percent of binder.
7. The wound cell of claim 6, wherein the first positive active coating or the second positive active coating,
the positive active material is one or more of nickel cobalt manganese, lithium iron phosphate, nickel cobalt aluminum, lithium cobaltate and lithium manganate;
the conductive agent is independently selected from one or more of conductive carbon black, ketjen black, conductive fibers, conductive polymers, acetylene black, carbon nanotubes, graphene, flake graphite, conductive oxides and metal particles;
the binder is independently selected from one or more of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene and styrene butadiene rubber.
8. The wound cell of claim 1, wherein the first negative active coating, the second negative active coating, the first positive active coating, or the second positive active coating has a thickness of 20-75 μm.
9. A wound cell according to any of claims 1 to 8, further comprising one or more of a positive tab, a negative tab, a separator.
10. A battery comprising a wound cell according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211558969.1A CN115986223A (en) | 2022-12-06 | 2022-12-06 | Winding type battery cell and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211558969.1A CN115986223A (en) | 2022-12-06 | 2022-12-06 | Winding type battery cell and battery |
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| CN115986223A true CN115986223A (en) | 2023-04-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344741A (en) * | 2023-05-26 | 2023-06-27 | 深圳市德兰明海新能源股份有限公司 | Positive electrode sheet, secondary battery, and electricity consumption device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116344741A (en) * | 2023-05-26 | 2023-06-27 | 深圳市德兰明海新能源股份有限公司 | Positive electrode sheet, secondary battery, and electricity consumption device |
| CN116344741B (en) * | 2023-05-26 | 2023-08-08 | 深圳市德兰明海新能源股份有限公司 | Positive electrode sheet, secondary battery, and electricity consumption device |
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