CN108306052B - Battery cell, manufacturing method thereof, battery and electronic device - Google Patents
Battery cell, manufacturing method thereof, battery and electronic device Download PDFInfo
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- CN108306052B CN108306052B CN201810185151.7A CN201810185151A CN108306052B CN 108306052 B CN108306052 B CN 108306052B CN 201810185151 A CN201810185151 A CN 201810185151A CN 108306052 B CN108306052 B CN 108306052B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 68
- 239000007774 positive electrode material Substances 0.000 claims abstract description 183
- 239000000758 substrate Substances 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims description 50
- 239000003792 electrolyte Substances 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 abstract description 25
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 11
- 238000001465 metallisation Methods 0.000 description 11
- 238000006479 redox reaction Methods 0.000 description 11
- 238000000151 deposition Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 230000008021 deposition Effects 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000011888 foil Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 238000004544 sputter deposition Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000009849 deactivation Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 150000002736 metal compounds Chemical class 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 1
- VGYDTVNNDKLMHX-UHFFFAOYSA-N lithium;manganese;nickel;oxocobalt Chemical compound [Li].[Mn].[Ni].[Co]=O VGYDTVNNDKLMHX-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a battery cell, a manufacturing method thereof, a battery and an electronic device. The manufacturing method of the battery cell comprises the following steps: providing a positive plate substrate; a positive electrode active material is arranged on the surface of a positive electrode substrate to form a first positive electrode active material layer; and disposing a second positive electrode active material layer at an edge region of the first positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m. By arranging the second positive electrode active material layer with the conductivity not more than 10 (-10) S/m at the edge area of the positive electrode plate of the battery cell, the phenomenon that lithium metal is deposited on the negative electrode plate of the battery cell can be reduced, and the service life of the battery cell is prolonged.
Description
Technical Field
The present disclosure relates to battery manufacturing, and more particularly to a battery cell, a battery and an electronic device.
Background
With the continuous popularization of mobile electronic products such as mobile phones, the mobile electronic products generally adopt a built-in battery design. The battery generally has an electric core, and the electric core generally comprises a positive plate, a negative plate and a diaphragm, wherein when the positive plate, the negative plate and the diaphragm are assembled, the edges of the positive plate and the negative plate can possibly have the problem of edge alignment, and at the moment, the edges of the positive plate and the negative plate can have oxidation-reduction reaction to cause the problem of lithium deposition at the edges of the negative plate.
Disclosure of Invention
The application provides a battery cell, a manufacturing method thereof, a battery and an electronic device, and aims to solve the problem that lithium deposition occurs at the edge of a negative electrode plate when the edges of the positive electrode plate and the negative electrode plate of the battery cell are aligned in the prior art.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: provided is a method for manufacturing a battery cell, wherein the method for manufacturing the battery cell comprises the following steps: providing a positive plate substrate; arranging a positive electrode active material on the surface of a positive electrode substrate to form a first positive electrode active material layer, wherein the positive electrode active material is used for absorbing or releasing charges so as to realize charge and discharge of the battery cell; and disposing a second positive electrode active material layer at an edge region of the first positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: the battery cell is used in a battery, wherein the battery cell comprises a positive plate, the positive plate comprises a positive plate substrate and a first positive electrode active material layer formed by positive electrode active materials, the first positive electrode active material layer is arranged on the surface of the positive plate substrate, and the first positive electrode active material is used for absorbing or releasing charges so as to realize charge and discharge of the battery cell; wherein the edge region of the first positive electrode active material layer is provided with a second positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m.
In order to solve the technical problem, another technical scheme adopted by the application is as follows: there is provided a battery, wherein the battery comprises the cell of any one of the preceding claims.
In order to solve the technical problem, another technical scheme adopted by the application is as follows: there is provided an electronic device, wherein the electronic device comprises a battery comprising a cell as defined in any of the preceding claims.
The beneficial effects of this application are: unlike the prior art, the application provides a battery cell, a manufacturing method thereof, a battery and an electronic device. By arranging the second positive electrode active material layer with the conductivity not more than 10 (-10) S/m at the edge part of the positive electrode plate of the battery core, the phenomenon of lithium metal deposition of the negative electrode plate of the battery core can be reduced, and the service life of the battery core is prolonged.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for manufacturing a battery cell according to the present application;
FIG. 2 is a flow chart of another embodiment of a method for manufacturing a battery cell according to the present application;
FIG. 3 is a flow chart of another embodiment of a method for manufacturing a battery cell according to the present application;
FIG. 4 is a flow chart of another embodiment of a method for manufacturing a battery cell according to the present application;
FIG. 5 is a schematic diagram of an embodiment of a battery cell provided in the present application;
FIG. 6 is a cross-sectional view of the cell shown in FIG. 5 at section A-A';
FIG. 7 is a schematic view of the structure of one of the battery cells of FIG. 6;
FIG. 8 is a schematic view of an embodiment of a positive plate in the battery unit provided in FIG. 7;
FIG. 9 is a schematic view of another embodiment of a positive plate in the battery cell provided in FIG. 7;
FIG. 10 is a schematic view of a further embodiment of a positive plate in the battery cell provided in FIG. 7;
FIG. 11 is a schematic view of a battery according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of an embodiment of an electronic device provided in the present application.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the application clearer, the technical scheme of the embodiment of the application will be described in further detail below with reference to the accompanying drawings.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for manufacturing a battery cell according to the present application.
The cell manufacturing method specifically comprises the following steps:
step S101: a positive electrode sheet substrate is provided.
In this step, the positive electrode sheet substrate is typically aluminum foil. The method comprises the following specific steps of: and manufacturing an aluminum block into an aluminum foil, and cutting the aluminum foil into preset sizes to form the positive plate substrate. The aluminum block is rolled into aluminum foil mainly by means of rolling force, namely, the roll gap is adjusted to keep a certain value so that the aluminum block is rolled into aluminum foil with uniform thickness.
Step S102: a positive electrode active material is provided on the surface of a positive electrode substrate to form a first positive electrode active material layer.
After step S101 is completed, step S102 is continued. That is, the positive electrode active material is uniformly coated on the surface of the positive electrode sheet substrate to form a positive electrode active material layer; cutting the positive electrode sheet substrate coated with the positive electrode active material into a size required for manufacturing a positive electrode sheet; welding a positive electrode lug at a preset position on the cut positive electrode plate substrate, and then finishing the manufacturing of the positive electrode plate through subsequent treatment. The positive electrode active material may include a lithium-containing metal compound or a lithium-intercalatable metal compound, such as lithium cobalt oxide, lithium manganese oxide, lithium nickel manganese cobalt oxide, lithium iron phosphate, lithium manganese phosphate, carbon black, and polyvinylidene fluoride (PVDF).
Step S103: and disposing a second positive electrode active material layer at an edge region of the first positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m.
After step S102 is completed, step S103 is continued. That is, a second positive electrode active material layer is provided at an edge region of the first positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m. The first positive electrode active material layer may have a higher conductivity than the second positive electrode active material layer, so that the conductivity of the middle region of the positive electrode sheet may be improved to improve the charge and discharge efficiency of the positive electrode sheet. In this step, a paste-penetration treatment may be performed on the edge region of the first positive electrode active material layer so that the paste penetrates into the positive electrode active material in the edge region of the first positive electrode active material layer to form the second positive electrode active material layer. The conductivity of the second positive electrode active material layer is not more than 10 (-10) S/m by selecting the glue with small conductivity, so that the conductivity of the edge part of the positive electrode plate can be weakened, and further the oxidation-reduction reaction performed by the edge of the positive electrode plate and the edge of the negative electrode plate can be weakened, and the problem of lithium metal deposition of the negative electrode plate is solved.
Further, an insulating paste may be used during the edge paste penetration process, so that the insulating paste penetrates into the first positive electrode active material layer, and wraps the positive electrode active material to form a non-conductive second positive electrode active material layer. In other embodiments, an insulating paste may also be used to cover the surface of the edge region of the first positive electrode active material layer to form a non-conductive second positive electrode active material layer. It is understood that forming the non-conductive second positive electrode active material layer at the edge of the positive electrode sheet can prevent the oxidation-reduction reaction between the edge of the positive electrode sheet and the edge of the negative electrode sheet, thereby avoiding the problem of lithium metal deposition on the negative electrode sheet. The insulating glue can be paraffin, PE glue or PP glue, and the like, and certain wettability is needed at the same time, so that the insulating glue is more easily adhered to the edge area of the first positive electrode active material layer.
In this step, the second positive electrode active material layer may be provided to the edge region of the positive electrode sheet substrate by vapor deposition, coating, electroplating, or sputtering. The method mainly comprises the steps of blocking the middle area of the first positive electrode active material layer by using a blocking object without blocking the edge area, and then arranging a material with small conductivity on the non-blocked edge area on the positive electrode plate substrate through the forming processes such as vapor plating, coating, electroplating or sputtering, so as to form a second positive electrode active material layer with the conductivity not more than 10 (-10) S/m. Wherein the material for forming the second positive electrode active material layer includes an organic material such as at least one of paraffin, PE paste, PP paste; or the material forming the second positive electrode active material layer includes at least one of a metal compound such as aluminum oxide, magnesium oxide, or barium sulfate.
Because the battery cell further includes the negative electrode sheet and the diaphragm sheet, in the method for manufacturing a battery cell according to the embodiment, the method for manufacturing a battery cell further includes manufacturing the negative electrode sheet and the diaphragm sheet. The manufacturing method of the negative plate comprises the following steps: providing a negative electrode sheet substrate, coating a negative electrode active material on the surface of the negative electrode sheet substrate to form a negative electrode active material layer, and then cutting the negative electrode sheet to a predetermined size. The negative electrode substrate may be copper foil, and the negative electrode active material may include graphite, sodium carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR) metal lithium, lithium storable metal powder, lithium storable metal oxide, various carbon materials, or the like. The method for manufacturing the diaphragm mainly cuts the diaphragm into predetermined dimensions.
In the method for manufacturing a battery cell according to this embodiment, positive and negative tabs are further disposed on the positive and negative electrode plates, respectively. That is, a positive electrode tab is arranged on the positive electrode sheet, and a negative electrode tab is arranged on the negative electrode sheet. The method of setting the positive electrode tab on the positive electrode sheet may be the same as the method of setting the negative electrode tab on the negative electrode sheet, taking the method of setting the positive electrode tab on the positive electrode sheet as an example. The method for arranging the positive electrode lug on the positive electrode plate comprises the following steps: when the positive plate substrate is cut, the positive plate substrate is cut into a sheet with a protruding part, wherein the protruding part can be used as a positive tab, i.e. the positive tab can be integrally arranged with the positive plate substrate; or welding the manufactured positive electrode tab to a preset position of the positive electrode plate, so that the positive electrode tab is electrically connected with the first positive electrode active material layer on the positive electrode plate.
The above method for manufacturing the battery cell is a method for manufacturing a positive electrode sheet, a negative electrode sheet, and a separator sheet. After the manufacturing of the positive plate, the negative plate and the diaphragm is completed, the diaphragm is arranged between the positive plate and the negative plate, the positive plate, the diaphragm and the negative plate are sequentially stacked, and then the stacked positive plate, diaphragm and negative plate are wound and formed to form a winding core of the battery cell; or the positive plate, the diaphragm, the negative plate and the diaphragm are stacked in the order of the positive plate, the diaphragm, the negative plate, the diaphragm and the positive plate … to form the structure required by the battery cell.
After the diaphragm is arranged between the positive plate and the negative plate, the positive plate, the negative plate and the diaphragm are required to be packaged, namely, after the diaphragm is arranged between the positive plate and the negative plate, the obtained combination of the positive plate, the diaphragm and the negative plate is packaged. The specific method of the packaging is that a shell is arranged, then a containing space is arranged in the shell, so that the positive plate, the diaphragm and the negative plate are arranged in the containing space, and then the containing space of the shell is sealed, so that the positive plate, the diaphragm and the negative plate are sealed in the containing space in the shell.
Before the accommodating space is sealed, electrolyte is injected into the accommodating space, so that the electrolyte submerges the positive plate, the diaphragm and the negative plate. The positive electrode plate and the negative electrode plate carry out charge transmission through electrolyte, so that the whole battery cell can be charged and discharged.
In this embodiment, the positive plate, the negative plate and the diaphragm can be cut into the same size, so that the assembly of the positive plate, the negative plate and the diaphragm is more convenient and quick, and the manufacturing efficiency of the battery cell is improved. Since the second positive electrode active material layer is provided at the edge of the positive electrode sheet and/or the negative electrode sheet and the conductivity of the second positive electrode active material layer is not more than 10 (-10) S/m, the problem that lithium deposition may occur at the edge of the negative electrode sheet when the positive electrode sheet, the negative electrode sheet and the separator sheet are the same in size can be prevented. Meanwhile, the sizes of the positive plate, the negative plate and the diaphragm are the same, so that the number of clamps or alignment tools can be reduced during assembly of the positive plate, the negative plate and the diaphragm, the assembly tools can be reduced, and the manufacturing cost can be reduced.
The application also provides a manufacturing method of the battery cell. Referring to fig. 2, fig. 2 is a flow chart of another embodiment of a method for manufacturing a battery cell according to the present application. The battery cell comprises a positive plate, and the manufacturing method of the battery cell specifically comprises the following steps:
s201: a positive electrode sheet substrate is provided.
The method for providing the positive electrode plate substrate and the material of the positive electrode plate substrate in this step are the same as those described in the previous step S101, and will not be described here again.
S202: and disposing a second positive electrode active material layer on an edge region of the surface of the positive electrode substrate, wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m.
After the preparation of the positive electrode sheet substrate in step S201 is completed, step S202 is continued. That is, the second positive electrode active material layer is formed in the edge region of the surface of the positive electrode substrate, and similarly, the second positive electrode active material layer may be formed in the edge region of the surface of the positive electrode substrate by a molding method such as vapor deposition, coating, plating, or sputtering. The forming method comprises the steps of shielding the middle area of the positive electrode plate substrate by using a barrier, and then arranging the material of the second positive electrode active material layer on the non-shielded edge area of the positive electrode plate substrate to form a second positive electrode active material layer, wherein the material for forming the second positive electrode active material layer comprises at least one of organic materials such as paraffin, PE (polyethylene) glue and PP (polypropylene) glue; or the material forming the second positive electrode active material layer includes at least one of metal oxide, such as aluminum oxide, magnesium oxide, or barium sulfate, such that the conductivity of the second positive electrode active material layer is not more than 10 (-10) S/m.
S203: the first positive electrode active material layer is provided on the surface of the positive electrode substrate except for the second positive electrode active material layer.
After step S202 is completed, step S203 is continued. That is, after the second positive electrode active material layer is provided in the edge region of the positive electrode substrate surface, the first positive electrode active material layer is provided in the center region of the positive electrode substrate surface except for the second positive electrode active material layer, so that the second positive electrode active material layer surrounds the first positive electrode active material layer. In this step, the first positive electrode active material layer may be formed by a molding process such as vapor deposition, coating, electroplating, or sputtering.
The method of manufacturing the battery cell also includes manufacturing the negative electrode sheet and the diaphragm sheet, as in the method described above. The manufacturing method of the negative electrode sheet and the diaphragm in the method is the same as the manufacturing method of the electrode sheet and the diaphragm described above. The same arrangement modes of the positive plate, the negative plate and the diaphragm comprise that corresponding lugs are respectively arranged on the positive plate and the negative plate, the arrangement structures of the positive plate, the negative plate and the diaphragm, the encapsulation mode that the positive plate, the negative plate and the diaphragm are encapsulated in the shell of the battery cell and the like can be the same as the method described above, and the details are omitted here.
Therefore, this embodiment provides a method for manufacturing a battery cell, in which a second positive electrode active material layer having a conductivity of not more than 10 (-10) S/m is disposed in an edge region of a positive electrode substrate, and then a first positive electrode active material layer is disposed in a middle region of the positive electrode sheet so that the second positive electrode active material layer surrounds the first positive electrode active material layer, so that the conductivity of the edge portion of the positive electrode substrate can be reduced, and further the oxidation-reduction reaction between the positive electrode sheet and the edge region of the negative electrode sheet is reduced, and the phenomenon of lithium metal deposition at the edge of the negative electrode sheet can be reduced; further, the second positive electrode active material layer can be set as an insulating layer so as to avoid oxidation-reduction reaction between the positive electrode plate and the edge area of the negative electrode plate, thus preventing the phenomenon of lithium metal deposition at the edge of the negative electrode plate; furthermore, the sizes of the positive plate, the negative plate and the diaphragm can be set to be the same size, so that the positive plate, the negative plate and the diaphragm are convenient to align during assembly, the number of clamps or alignment tools can be reduced, the assembly tools can be reduced, and the manufacturing cost can be reduced.
The application also provides a manufacturing method of the battery cell. Referring to fig. 3, fig. 3 is a flow chart of another embodiment of a method for manufacturing a battery cell provided in the present application. The battery cell comprises a positive plate, and the manufacturing method of the battery cell specifically comprises the following steps:
s301: a positive electrode sheet substrate is provided.
The method for providing the positive electrode plate substrate and the material of the positive electrode plate substrate in this step are the same as those described in the previous step S101, and will not be described here again.
S302: a positive electrode active material is disposed on a surface of a positive electrode substrate to form a first positive electrode active material layer.
After the preparation of the positive electrode sheet substrate in step S301 is completed, step S302 is continued. That is, the first positive electrode active material layer is formed on the surface of the positive electrode substrate, where the material of the first positive electrode active material layer and the arrangement manner on the positive electrode substrate may be the same as those described above, and details thereof will not be repeated here.
S303: and removing the positive electrode active material at the edge region of the first positive electrode active material layer, and then providing a second positive electrode active material layer having a conductivity of not more than 10 (-10) S/m in the removed region of the positive electrode active material.
After the preparation of the positive electrode sheet substrate in step S302 is completed, step S303 is continued. That is, after the first positive electrode active material layer is provided on the positive electrode sheet substrate, the positive electrode active material is removed from the edge region of the first positive electrode active material layer, and then the second positive electrode active material layer having a conductivity of not more than 10 (-10) S/m is provided in the region from which the positive electrode active material is removed. In this step, the positive electrode active material at the edge of the first positive electrode active material layer may be removed by laser burning; or the active material in the edge area of the first positive electrode active material layer can be corroded or dissolved and removed by using a reagent.
The method of manufacturing the battery cell also includes manufacturing the negative electrode sheet and the diaphragm sheet, as in the method described above. The manufacturing method of the negative electrode sheet and the diaphragm in the method is the same as the manufacturing method of the electrode sheet and the diaphragm described above. The same arrangement modes of the positive plate, the negative plate and the diaphragm comprise that corresponding lugs are respectively arranged on the positive plate and the negative plate, the arrangement structures of the positive plate, the negative plate and the diaphragm, the encapsulation mode that the positive plate, the negative plate and the diaphragm are encapsulated in the shell of the battery cell and the like can be the same as the method described above, and the details are omitted here.
According to the manufacturing method of the battery cell, the first positive electrode active material layer is arranged on the surface of the positive electrode substrate, then the positive electrode active material at the edge of the first positive electrode active material layer is removed, and the second positive electrode active material layer with the conductivity not more than 10 (-10) S/m is arranged in the area where the positive electrode active material is removed, so that the second positive electrode active material layer surrounds the first positive electrode active material layer, the conductivity of the edge part of the positive electrode substrate can be reduced, the oxidation-reduction reaction of the edge area of the positive electrode sheet and the negative electrode sheet is further weakened, and the phenomenon that lithium metal deposition occurs at the edge of the negative electrode sheet can be reduced; further, the second positive electrode active material layer can be set as an insulating layer so as to avoid oxidation-reduction reaction between the positive electrode plate and the edge area of the negative electrode plate, thus preventing the phenomenon of lithium metal deposition at the edge of the negative electrode plate; furthermore, the sizes of the positive plate, the negative plate and the diaphragm can be set to be the same size, so that the positive plate, the negative plate and the diaphragm are convenient to align during assembly, the number of clamps or alignment tools can be reduced, the assembly tools can be reduced, and the manufacturing cost can be reduced.
The application also provides a manufacturing method of the battery cell. Referring to fig. 4, fig. 4 is a flow chart of another embodiment of a method for manufacturing a battery cell provided in the present application. The battery cell comprises a positive plate, and the manufacturing method of the battery cell specifically comprises the following steps:
s401: a positive electrode sheet substrate is provided.
The method for providing the positive electrode sheet substrate in this step is the same as the method for providing the positive electrode sheet substrate described above, and the specific preparation method and material selection are referred to in the foregoing embodiments.
S402: a first positive electrode active material layer is provided on the surface of a positive electrode substrate.
After the preparation of the positive electrode sheet substrate in step S401 is completed, step S402 is continued. That is, the first positive electrode active material layer is formed on the surface of the positive electrode substrate, where the material of the first positive electrode active material layer and the arrangement manner on the positive electrode substrate may be the same as those described above, and details thereof will not be repeated here.
S403: and performing a deactivation treatment on the edge region of the first positive electrode active material layer to form a second positive electrode active material layer such that the conductivity of the second positive electrode active material layer is not more than 10 (-10) S/m.
After step S402 is completed, step S403 is continued. That is, after the first positive electrode active material layer is provided on the surface of the positive electrode substrate, the edge of the first positive electrode active material layer is subjected to a deactivation treatment, so that a second positive electrode active material layer having a conductivity of not more than 10 (-10) S/m is formed in the deactivated region. In this step, the positive electrode active material in the edge region of the first positive electrode active material layer may be heat-treated by a local heat treatment method, for example, by laser irradiation heating, so that the heat-treated first positive electrode active material layer has a reduced conductivity, so that the edge region of the first positive electrode active material layer eventually forms a second positive electrode active material layer having a conductivity of not more than 10 (-10) S/m. In this step, the conductivity of the positive electrode active material in the edge region of the first positive electrode active material layer may be completely removed to form the insulating layer.
The method of manufacturing the battery cell also includes manufacturing the negative electrode sheet and the diaphragm sheet, as in the method described above. The manufacturing method of the negative electrode sheet and the diaphragm in the method is the same as the manufacturing method of the electrode sheet and the diaphragm described above. The same arrangement modes of the positive plate, the negative plate and the diaphragm comprise that corresponding lugs are respectively arranged on the positive plate and the negative plate, the arrangement structures of the positive plate, the negative plate and the diaphragm, the encapsulation mode that the positive plate, the negative plate and the diaphragm are encapsulated in the shell of the battery cell and the like can be the same as the method described above, and the details are omitted here.
Therefore, this embodiment provides another method for manufacturing a battery cell, in which a first positive electrode active material layer is disposed on a surface of a positive electrode substrate, and then a positive electrode active material on an edge of the first positive electrode active material layer is subjected to deactivation treatment, so that a second positive electrode active material layer with a conductivity of not more than 10 (-10) S/m is formed on the edge of the first positive electrode active material layer, and the second positive electrode active material layer surrounds the first positive electrode active material layer, so that conductivity of an edge portion of the positive electrode substrate can be reduced, and further oxidation-reduction reaction between the positive electrode and the negative electrode is reduced, and a phenomenon of lithium metal deposition on the edge of the negative electrode can be reduced; further, the positive electrode active material at the edge of the first positive electrode active material layer can be completely removed, so that an insulating layer is formed at the edge of the first positive electrode active material layer, thereby avoiding oxidation-reduction reaction between the positive electrode plate and the edge area of the negative electrode plate, and preventing the edge of the negative electrode plate from depositing lithium metal; furthermore, the sizes of the positive plate, the negative plate and the diaphragm can be set to be the same size, so that the positive plate, the negative plate and the diaphragm are convenient to align during assembly, the number of clamps or alignment tools can be reduced, the assembly tools can be reduced, and the manufacturing cost can be reduced.
In summary, fig. 1 to 4 provide four manufacturing methods of the battery cells, in which the second positive electrode active material layer with the conductivity not greater than 10 (-10) S/m is disposed at the edge region of the positive electrode sheet, so as to reduce the conductivity of the edge of the positive electrode sheet, and weaken the oxidation-reduction reaction of the edge regions of the positive electrode sheet and the negative electrode sheet, so that the problem of lithium metal deposition at the edge of the negative electrode sheet can be alleviated. The difference is that the method of providing the second positive electrode active material layer having small conductivity in the edge region of the positive electrode sheet is different.
The present embodiment also provides a battery cell, please refer to fig. 5 to 7, fig. 5 is a schematic structural diagram of an embodiment of the battery cell provided in the present application, fig. 6 is a cross-sectional view of the battery cell shown in fig. 5 at A-A', and fig. 7 is a schematic structural diagram of a battery cell shown in fig. 6. The battery cell 200 is used in a battery, where the battery cell 200 includes a positive electrode sheet 210, a negative electrode sheet 220, and a separator sheet 230, and adjacent positive electrode sheet 210, separator sheet 230, and negative electrode sheet 220 may form a battery unit. Wherein the separator 230 is disposed between the positive electrode sheet 210 and the negative electrode sheet 220 to separate the positive electrode sheet 210 and the negative electrode sheet 220. The positive electrode sheet 210 includes a positive electrode sheet substrate 216 and a positive electrode active material layer disposed on a surface of the positive electrode sheet substrate, wherein the positive electrode active material layer includes a first positive electrode active material layer 212 and a second positive electrode active material layer 211, wherein the second positive electrode active material layer 211 is disposed at an edge region of the first positive electrode active material layer 212 and surrounds the first positive electrode active material layer 212, and a conductivity of the second positive electrode active material layer 211 is not more than 10 (-10) S/m.
Therefore, in this embodiment, by disposing the second positive electrode active material layer 211 with a conductivity not greater than 10 (-10) S/m at the edge portion of the positive electrode sheet 210, the oxidation-reduction reaction between the edges of the positive electrode sheet 210 and the negative electrode sheet 220 is weakened when the battery cell is operating normally, so that the problem of deposition of lithium metal at the edge of the negative electrode sheet 220 can be alleviated, and therefore, the performance of the battery cell can be improved and the service life of the battery cell can be prolonged. Further, the second positive electrode active material layer 211 may be further provided as an insulating layer, so that oxidation-reduction between the edges of the positive electrode sheet 210 and the negative electrode sheet 220 may be avoided, and thus, lithium metal deposition problem at the edge of the negative electrode sheet 220 may be prevented, and thus, performance of the battery cell may be further improved, and service life of the battery cell may be prolonged.
In this embodiment, the manufacturing methods of the positive electrode sheet 210, the negative electrode sheet 220 and the diaphragm sheet refer to the aforementioned cell manufacturing methods, and are not described herein. The surface of the positive electrode substrate 216 is provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211. The first positive electrode active material layers 212 and the second positive electrode active material layers 211 may be disposed on both sides of the positive electrode sheet substrate 216, wherein the first positive electrode active material layers 212 on both sides of the positive electrode sheet substrate 216 may be disposed symmetrically, and the second positive electrode active material layers 211 on both sides of the positive electrode sheet substrate 216 may be disposed symmetrically. The arrangement of the second positive electrode active material layer 211 on the positive electrode sheet 210 includes the following.
Referring to fig. 7 and 8, fig. 8 is a schematic structural diagram of an embodiment of a positive plate in the battery unit provided in fig. 7. The surface of the positive electrode substrate 216 of the positive electrode sheet 210 is provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211, wherein the second positive electrode active material layer 211 is disposed in an edge region of the positive electrode substrate 216, and the second positive electrode active material layer 211 forms a sealed annular region to surround the first positive electrode active material layer 212. The method is more suitable for the battery cells arranged in a lamination mode. This solution is suitable for the case that the size of the positive electrode sheet 210 is the same as that of the negative electrode sheet 220, when the size of the positive electrode sheet 210 is the same as that of the negative electrode sheet 220, the alignment phenomenon may occur at all edges of the positive electrode sheet 210 and the negative electrode sheet 220 after the positive electrode sheet 210, the negative electrode sheet 220 and the separator sheet 230 are assembled, and thus the problem of lithium deposition may occur at all edge regions of the negative electrode sheet 220, and therefore the first positive electrode active material layer 212 may be surrounded by forming a sealed annular region through the second positive electrode active material layer 211, thereby the problem of lithium deposition at the edge of the negative electrode sheet may be improved.
Referring to fig. 7 and 9, fig. 9 is a schematic structural diagram of another embodiment of a positive plate in the battery unit provided in fig. 7. The positive electrode sheet 210 also includes a positive electrode sheet substrate 216, and the surface of the positive electrode sheet substrate 216 is also provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211. The difference from the positive electrode sheet described in fig. 5 is that the second positive electrode active material layer 212 is disposed in a partial region of the edge of the positive electrode sheet substrate 216, and the second positive electrode active material layer 212 partially surrounds the first positive electrode active material layer 211, that is, the second positive electrode active material layer 212 is not a closed ring structure, for example, in the present embodiment, the second positive electrode active material layer 212 may be disposed in an edge region corresponding to 3 sides of the positive electrode sheet 210. This solution is suitable for the case that the positive electrode sheet 210 and the negative electrode sheet 220 have different sizes, wherein 3 sides of the positive electrode sheet 210 provided with the second positive electrode active material layer 212 are aligned with the corresponding 3 sides of the negative electrode sheet 220, and sides of the positive electrode sheet 210 not provided with the second positive electrode active material layer 212 are staggered with the corresponding sides of the negative electrode sheet 220, so that the lithium deposition problem at the edge of the negative electrode sheet 220 can be improved.
Referring to fig. 7 and 10, fig. 10 is a schematic structural diagram of another embodiment of a positive plate in the battery unit provided in fig. 7. The positive electrode sheet 210 also includes a positive electrode sheet substrate 216, and the surface of the positive electrode sheet substrate 216 is also provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211. The difference from the positive electrode sheet described in fig. 5 is that the second positive electrode active material layer 212 is provided at the edge regions of both sides of the positive electrode sheet substrate 216. The same scheme as that described in fig. 9 is applicable to the case where the positive electrode sheet 210 and the negative electrode sheet 220 are different in size, in which 2 sides of the positive electrode sheet 210 on which the second positive electrode active material layer 212 is disposed are aligned with the corresponding 2 sides of the negative electrode sheet 220, and sides of the positive electrode sheet 210 on which the second positive electrode active material layer 212 is not disposed are offset from the corresponding sides of the negative electrode sheet 220, so that the problem of lithium deposition at the edges of the negative electrode sheet 220 can be improved as well.
In this embodiment, in order to improve the manufacturing efficiency of the battery cell 200, the positive electrode sheet 210, the negative electrode sheet 220, and the diaphragm sheet 230 may be set to have the same size. So that the edges of the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet 230 can be aligned when they are assembled.
In this embodiment, the positive electrode tab 210 is further provided with a positive electrode tab 214, and the negative electrode tab 220 is also provided with a negative electrode tab 224, wherein the positive electrode tab 214 is electrically connected to the positive electrode tab substrate 216, and the negative electrode tab 224 is electrically connected to the negative electrode tab substrate. The positive electrode tab 214 and the negative electrode tab 224 respectively correspond to the positive electrode and the negative electrode of the battery cell 200, that is, the battery cell 200 completes the charge and discharge process through the positive electrode tab 214 and the negative electrode tab 224.
In this embodiment, the battery cell 200 further includes a housing 240, where the housing 240 is provided with a receiving space 241 for disposing the positive electrode tab 210, the negative electrode tab 220, and the diaphragm 230. After the positive plate 210, the negative plate 220 and the diaphragm 230 are disposed in the accommodating space 241, an electrolyte is further injected into the accommodating space 241, so that the positive plate 210, the negative plate 220 and the diaphragm 230 are immersed in the electrolyte, and the electrolyte is effective to enable the positive plate 210 and the negative plate 220 to perform charge transmission through the electrolyte, thereby realizing that the whole battery cell 200 can be charged and discharged. The electrolyte is prepared from high-purity organic solvent, electrolyte lithium salt (lithium hexafluorophosphate), necessary additives and other raw materials according to a certain proportion under a certain condition.
When the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet 230 are disposed in the accommodation space 241 and immersed in the electrolyte, it is necessary to ensure that the material used for manufacturing the second positive electrode active material layer 211 on the positive electrode sheet 210 does not react with the electrolyte or dissolve into the electrolyte.
In this embodiment, the positive electrode sheet 210, the negative electrode sheet 220 and the separator sheet 230 may be stacked in order of the positive electrode sheet 210, the separator sheet 230 and the negative electrode sheet 220, and then the stacked positive electrode sheet 210, the separator sheet 230 and the negative electrode sheet 220 are wound to form a winding core of the battery cell 200, and then the winding core is disposed in the accommodating space 241; alternatively, the positive electrode sheet 210, the separator sheet 230, and the negative electrode sheet 220 may be stacked in the order of the positive electrode sheet 210, the separator sheet 230, the negative electrode sheet 220, the separator sheet 230, and the positive electrode sheet 210 and … to form an electrode sheet assembly required for the battery cell, and then the electrode sheet assembly is disposed in the accommodating space 241.
The present application also provides a battery, referring to fig. 11, fig. 11 is a schematic structural diagram of an embodiment of a battery provided in the present application. The battery 500 is internally provided with a battery cell 510, and the battery cell 510 includes a battery cell as described in any one of the foregoing, which is not described herein.
The present application also provides an electronic device, please refer to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of an electronic device provided in the present application. The battery 610 is disposed inside the electronic device 600, and the battery 610 includes any of the foregoing batteries, which are not described herein.
In summary, the present embodiment provides a battery cell, a method for manufacturing the same, a battery and an electronic device. By arranging the second positive electrode active material layer with the conductivity not more than 10 (-10) S/m at the edge part of the positive electrode plate of the battery cell, the phenomenon of lithium metal deposition of the negative electrode plate of the battery cell can be reduced, and the service life of the battery cell is prolonged. Further, the positive plate, the negative plate and the diaphragm can be set to be of the same size, so that the positive plate, the negative plate and the diaphragm are simple and convenient to assemble and align, and excessive clamps or alignment tools are not needed, thereby simplifying the manufacturing process, improving the production efficiency and reducing the production cost.
The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (7)
1. A method of manufacturing a battery cell including a positive electrode sheet, the method comprising:
providing a positive plate substrate;
setting a positive electrode active material on the surface of the positive electrode substrate to form a first positive electrode active material layer;
performing glue permeation treatment on the edge area of the first positive electrode active material layer to form a second positive electrode active material layer, or;
covering an insulating adhesive on the surface of the edge area of the first positive electrode active material layer to form a second positive electrode active material layer;
wherein the second positive electrode active material layer has a conductivity of not more than 10 (-10) S/m;
providing a negative plate and a diaphragm;
and cutting the positive plate, the negative plate and the diaphragm into the same size.
2. The cell manufacturing method according to claim 1, further comprising:
a positive electrode tab is arranged on the positive electrode plate, and a negative electrode tab is arranged on the negative electrode plate;
disposing the membrane sheet between the positive electrode sheet and the negative electrode sheet;
and packaging the diaphragm sheet, the positive electrode sheet and the negative electrode sheet.
3. The method of manufacturing a battery cell according to claim 2, wherein,
the step of packaging the diaphragm sheet, the positive electrode sheet and the negative electrode sheet specifically comprises the following steps:
providing a housing for the electrical core;
and sealing the diaphragm, the positive plate and the negative plate in the accommodating space of the shell.
4. An electric core, which is used in a battery, characterized in that,
the battery cell comprises a positive plate, wherein the positive plate comprises a positive plate substrate and a first positive active material layer arranged on the surface of the positive plate substrate;
wherein the edge region of the first positive electrode active material layer is provided with a second positive electrode active material layer, and the conductivity of the second positive electrode active material layer is not more than 10 (-10) S/m;
the second positive electrode active material layer is formed by performing a glue-penetrating treatment on an edge region of the first positive electrode active material layer, or;
the second positive electrode active material layer is formed by covering an insulating paste on the surface of the edge region of the first positive electrode active material layer;
the battery cell also comprises a negative plate and a diaphragm, wherein the sizes of the positive plate, the negative plate and the diaphragm are the same.
5. The cell of claim 4, wherein the positive plate further comprises a positive tab, the negative plate further comprises a negative tab, and the cell is electrically connected to an external circuit through the positive tab and the negative tab to realize charge and discharge;
the diaphragm is arranged between the positive plate and the negative plate and is used for separating the positive plate from the negative plate;
the battery cell also comprises a shell, wherein the shell is provided with a containing space for containing the positive plate, the negative plate and the diaphragm, electrolyte is further arranged in the containing space, and the electrolyte submerges the positive plate and the negative plate so as to realize charge transmission between the positive plate and the negative plate.
6. A battery having a cell disposed therein, wherein the cell comprises the cell of claim 4.
7. An electronic device comprising a battery having a battery cell disposed therein, wherein the battery cell comprises the battery cell of claim 4.
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| CN109980177B (en) * | 2019-03-29 | 2021-10-22 | 东莞新能安科技有限公司 | Electrode sheet and electrochemical device comprising same |
| CN110010902A (en) | 2019-03-29 | 2019-07-12 | 宁德新能源科技有限公司 | Electrode plates and electrochemical appliance comprising the electrode plates |
| CN113410432B (en) * | 2020-05-08 | 2022-05-27 | 珠海冠宇电池股份有限公司 | Negative plate, preparation method and lithium ion battery comprising negative plate |
| CN112186273B (en) * | 2020-10-29 | 2022-03-29 | 珠海冠宇电池股份有限公司 | Winding core capable of reducing internal temperature rise for winding type lithium ion battery |
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