CN113571675B - Electrode pole piece and lithium ion battery - Google Patents
Electrode pole piece and lithium ion battery Download PDFInfo
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- CN113571675B CN113571675B CN202110843138.8A CN202110843138A CN113571675B CN 113571675 B CN113571675 B CN 113571675B CN 202110843138 A CN202110843138 A CN 202110843138A CN 113571675 B CN113571675 B CN 113571675B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses an electrode plate and a lithium ion battery, and relates to the field of lithium ion batteries, wherein the electrode plate comprises a composite current collector, a first foil and a second foil; the composite current collector comprises a substrate, a first conducting layer and a second conducting layer, wherein the substrate comprises a first surface and a second surface opposite to the first surface, the first conducting layer is fixedly connected to the first surface, and the second conducting layer is fixedly connected to the second surface; the first foil is fixedly connected with the first conducting layer, and the second foil is fixedly connected with the second conducting layer to form a three-layer structure area; the first foil is fixedly connected with the second foil to form a two-layer structure area; the parts of the first conductive layer and the second conductive layer in the three-layer structure area are contacted. The invention has the advantages that: the influence of the cold solder on the resistance of the battery cell can be effectively reduced, and the resistance of the battery cell is reduced.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to an electrode plate and a lithium ion battery.
Background
The lithium battery has the advantages of small volume, large capacity, long service life, low self-discharge rate, no memory effect, environmental protection and the like, and is widely applied to commercial vehicles, special vehicles, electric bicycles, energy storage systems, medical instruments and the like at present. The current collector refers to a structure or a part for collecting current, and mainly refers to metal foil on the lithium ion battery. Patent CN112789752a discloses a composite current collector, an electrode plate and an electrochemical device, where the composite current collector includes a substrate, a first connection layer, a first conductive layer, a second connection layer, and a second conductive layer, the first connection layer is used to bond the first conductive layer to a first surface of the substrate, and the second connection layer is used to bond the second conductive layer to a second surface of the substrate. Because the intermediate matrix of the existing composite current collector is generally made of a non-metallic material, the welding problem generally exists in the production process of the battery core, and when the conducting layers on the two sides of the composite current collector cannot be conducted or the conduction rate is low, the resistance value of the battery core is large, and the performance of the battery is influenced; because the substrate layer of the composite current collector is generally an insulating substance, the consistency of the electron density of the two surfaces of the pole piece in the charging process of the battery cell is difficult to ensure, and the performance of the battery is influenced; the composite current collector and the foil are generally welded by adopting a three-layer structure, namely the foil, the composite current collector and the foil, and the welding mode is easy to produce cold joint, so that the resistance of the battery cell is large.
Disclosure of Invention
The invention aims to provide an electrode pole piece capable of reducing the resistance value of a battery cell and a lithium ion battery.
The invention solves the technical problems through the following technical means: the electrode pole piece comprises a composite current collector (1), a first foil (2) and a second foil (3); the composite current collector (1) comprises a substrate (11), a first conductive layer (12) and a second conductive layer (13), wherein the substrate (11) comprises a first surface (111) and a second surface (112) opposite to the first surface (111), the first conductive layer (12) is fixedly connected to the first surface (111), and the second conductive layer (13) is fixedly connected to the second surface (112); the first foil (2) is fixedly connected with the first conducting layer (12), and the second foil (3) is fixedly connected with the second conducting layer (13), so that a three-layer structure area formed by sequentially connecting the first foil (2), the composite current collector (1) and the second foil (3) is formed; the first foil (2) is also fixedly connected with the second foil (3) to form a two-layer structure area; the parts of the first conductive layer (12) and the second conductive layer (13) in the three-layer structure area are contacted.
The parts of the first foil and the second foil, which are positioned in the three-layer structure area, play a role in protection, and can prevent the composite current collector from being welded through in the welding process; the parts of the first foil and the second foil in the two-layer structure area play a role in guiding flow, and the part of the second foil in the two-layer structure area is used as a tab of the electrode plate; the composite current collector, the first foil and the second foil adopt two sections of connection designs of a three-layer structure area and a two-layer structure area to play a dual overcurrent role, so that the influence of cold solder on the resistance value of the battery cell can be effectively reduced, and the resistance value of the battery cell is reduced.
As an optimized technical scheme, a plurality of through holes (113) penetrating between the first surface (111) and the second surface (112) are formed in the base body (11), conductive substances are filled in the through holes (113), and the conductive substances are communicated between the first conductive layer (12) and the second conductive layer (13). The through hole structure ensures the consistency of the electron density of the two surfaces of the electrode pole piece in the process of charging the battery cell, can effectively reduce the polarization of the battery cell and reduce the resistance value of the battery cell.
As the optimized technical scheme, the diameter of the through hole is 0.5 um-4 um.
As an optimized technical scheme, the substrate (11) adopts one of polyethylene terephthalate, polyimide, o-phenylphenol, polypropylene and polyethylene.
As an optimized technical scheme, the thickness of the substrate (11) is 3-12 um.
As an optimized technical scheme, the first conducting layer (12) and the second conducting layer (13) adopt one of aluminum, nickel, copper, iron and tungsten.
As an optimized technical scheme, the thicknesses of the first conducting layer (12) and the second conducting layer (13) are both 0.5-6 um.
As an optimized technical scheme, the electrode pole piece further comprises a first coating layer (4) and a second coating layer (5), wherein the first coating layer (4) is coated on one surface, opposite to the first surface (111), of the first conducting layer (12), and the second coating layer (5) is coated on one surface, opposite to the second surface (112), of the second conducting layer (13).
The electrode plate manufacturing method for manufacturing the electrode plate comprises the following steps: and simultaneously finishing roll welding on the three-layer structure area and the two-layer structure area by adopting a stepped roll welding head (6), wherein the part of the substrate (11) positioned in the three-layer structure area is extruded out of the welding mark area in the roll welding process, so that the parts of the first conducting layer (12) and the second conducting layer (13) positioned in the three-layer structure area are contacted.
The lithium ion battery comprises a positive pole piece and a negative pole piece, wherein the positive pole piece and/or the negative pole piece adopt the electrode pole pieces.
The invention has the advantages that:
1. the composite current collector, the first foil and the second foil adopt two sections of connection designs of a three-layer structure area and a two-layer structure area to play a dual overcurrent role, so that the influence of cold solder on the resistance value of the battery cell can be effectively reduced, and the resistance value of the battery cell is reduced.
2. The through hole structure ensures the consistency of the electron density of the two surfaces of the electrode pole piece in the process of charging the battery cell, can effectively reduce the polarization of the battery cell and reduce the resistance value of the battery cell.
Drawings
FIG. 1 is a schematic structural diagram of an electrode sheet according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a state before roll welding is performed by using a stepped roll welding head in the electrode sheet manufacturing method according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the electrode plate includes a composite current collector 1, a first foil 2, a second foil 3, a first coating layer 4, and a second coating layer 5.
The composite current collector 1 comprises a substrate 11, a first conductive layer 12 and a second conductive layer 13; the substrate 11 comprises a first surface 111 and a second surface 112 opposite to the first surface 111, a plurality of through holes 113 penetrating between the first surface 111 and the second surface 112 are arranged on the substrate 11, the through holes 113 are uniformly distributed on the substrate 11, and the diameter of each through hole 113 is 0.5-4 um; the substrate 11 is made of one of polyethylene terephthalate (PET), polyimide (PI), o-phenylphenol (OPP), polypropylene (PP) and Polyethylene (PE), and the thickness of the substrate 11 is 3-12 um; the first conductive layer 12 is fixedly connected to the first surface 111; the second conductive layer 13 is fixedly connected to the second surface 112; the through hole 113 is filled with a conductive material (not shown), the conductive material is communicated between the first conductive layer 12 and the second conductive layer 13, and the conductive material is the same as the first conductive layer 12 and the second conductive layer 13; when the electrode plate is used as a positive electrode plate, the first conducting layer 12, the second conducting layer 13 and the conducting material adopt one of aluminum and nickel; when the electrode pole piece is used as a negative pole piece, the first conducting layer 12, the second conducting layer 13 and the conducting substance adopt one of copper, iron and tungsten; the thicknesses of the first conductive layer 12 and the second conductive layer 13 are both 0.5um to 6um.
The front section of the first foil 2 is welded with the first conducting layer 12, and the front section of the second foil 3 is welded with the second conducting layer 13, so that a three-layer structure area formed by sequentially connecting the first foil 2, the composite current collector 1 and the second foil 3 is formed; the rear section of the first foil 2 is welded with the rear section of the second foil 3 to form a two-layer structure area; the parts of the first conductive layer 12 and the second conductive layer 13 in the three-layer structure area are contacted.
The first coating layer 4 is coated on the first conductive layer 12 opposite to the first surface 111, and the second coating layer 5 is coated on the second conductive layer 13 opposite to the second surface 112.
The electrode plate manufacturing method for manufacturing the electrode plate comprises the following steps:
firstly, processing a plurality of uniformly distributed through holes 113 between a first surface 111 and a second surface 112 of a substrate 11 by a mechanical or laser mode;
plating a first conductive layer 12 and a second conductive layer 13 on the first surface 111 and the second surface 112 by using a plating technology, wherein the materials of the first conductive layer 12 and the second conductive layer 13 are filled in each through hole 113 during plating, so that the first conductive layer 12 is communicated with the second conductive layer 13;
step three, as shown in fig. 2, simultaneously completing roll welding on the three-layer structure area and the two-layer structure area by using a stepped roll welding head 6, wherein the welding mark widths of the three-layer structure area and the two-layer structure area are both 2 mm-6 mm, and the part of the substrate 11, which is positioned in the three-layer structure area, is extruded out of the welding mark area in the roll welding process, so that the parts, which are positioned in the three-layer structure area, of the first conductive layer 12 and the second conductive layer 13 are in contact;
and step four, coating a first coating layer 4 and a second coating layer 5 on the first conductive layer 12 and the second conductive layer 13.
The lithium ion battery comprises a positive pole piece and a negative pole piece, wherein the positive pole piece and/or the negative pole piece adopt the electrode pole pieces.
The working principle of the electrode plate and the lithium ion battery is as follows: the composite current collector 1, the first foil 2 and the second foil 3 adopt a three-layer structure area and a two-layer structure area, so that a dual overcurrent effect can be achieved, the influence of cold solder on the resistance of the battery cell can be effectively reduced, and the consistency of the electronic density of the two surfaces of the electrode pole piece in the battery cell charging process is ensured by the through hole 113.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An electrode sheet, characterized in that: the current collector comprises a composite current collector (1), a first foil (2) and a second foil (3); the composite current collector (1) comprises a substrate (11), a first conductive layer (12) and a second conductive layer (13), wherein the substrate (11) comprises a first surface (111) and a second surface (112) opposite to the first surface (111), the first conductive layer (12) is fixedly connected to the first surface (111), and the second conductive layer (13) is fixedly connected to the second surface (112); the first foil (2) is fixedly connected with the first conducting layer (12), and the second foil (3) is fixedly connected with the second conducting layer (13), so that a three-layer structure area formed by sequentially connecting the first foil (2), the composite current collector (1) and the second foil (3) is formed; the first foil (2) is also fixedly connected with the second foil (3) to form a two-layer structure area; the parts of the first conductive layer (12) and the second conductive layer (13) in the three-layer structure area are contacted;
the method for manufacturing the electrode plate comprises the following steps: and simultaneously finishing roll welding on the three-layer structure area and the two-layer structure area by adopting a stepped roll welding head (6), wherein the part of the substrate (11) positioned in the three-layer structure area is extruded out of the welding mark area in the roll welding process, so that the parts of the first conducting layer (12) and the second conducting layer (13) positioned in the three-layer structure area are contacted.
2. The electrode tab of claim 1 wherein: the substrate (11) is provided with a plurality of through holes (113) penetrating between the first surface (111) and the second surface (112), conductive substances are filled in the through holes (113), and the conductive substances are communicated between the first conductive layer (12) and the second conductive layer (13).
3. The electrode tab of claim 2 wherein: the diameter of the through hole is 0.5 um-4 um.
4. The electrode pad of claim 1, wherein: the substrate (11) is made of one of polyethylene glycol terephthalate, polyimide, o-phenylphenol, polypropylene and polyethylene.
5. The electrode pad of claim 1, wherein: the thickness of the base body (11) is 3 um-12 um.
6. The electrode pad of claim 1, wherein: the first conducting layer (12) and the second conducting layer (13) adopt one of aluminum, nickel, copper, iron and tungsten.
7. The electrode pad of claim 1, wherein: the thickness of the first conducting layer (12) and the second conducting layer (13) is 0.5 um-6 um.
8. The electrode pad of claim 1, wherein: the electrode plate further comprises a first coating layer (4) and a second coating layer (5), wherein the first coating layer (4) is coated on one side, opposite to the first surface (111), of the first conducting layer (12), and the second coating layer (5) is coated on one side, opposite to the second surface (112), of the second conducting layer (13).
9. A lithium ion battery, characterized by: the electrode comprises a positive pole piece and a negative pole piece, wherein the positive pole piece and/or the negative pole piece adopt the electrode pole piece of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110843138.8A CN113571675B (en) | 2021-07-26 | 2021-07-26 | Electrode pole piece and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110843138.8A CN113571675B (en) | 2021-07-26 | 2021-07-26 | Electrode pole piece and lithium ion battery |
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| CN113571675A CN113571675A (en) | 2021-10-29 |
| CN113571675B true CN113571675B (en) | 2022-10-11 |
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| CN114068862A (en) * | 2021-11-11 | 2022-02-18 | 苏州达牛新能源科技有限公司 | Battery pole piece based on composite current collector and preparation method thereof |
| CN114156488A (en) * | 2021-11-29 | 2022-03-08 | 珠海冠宇电池股份有限公司 | Pole piece, preparation method thereof and battery |
| JP2024502222A (en) * | 2021-12-10 | 2024-01-18 | 寧徳時代新能源科技股▲分▼有限公司 | Composite current collectors, electrode sheets, secondary batteries, battery modules, battery packs, and electrical devices |
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| JPS566368A (en) * | 1979-06-28 | 1981-01-22 | Seiko Instr & Electronics Ltd | Superthin type solid electrolyte cell |
| US9548497B2 (en) * | 2011-06-10 | 2017-01-17 | Eaglepicher Technologies, Llc | Layered composite current collector with plurality of openings, methods of manufacture thereof, and articles including the same |
| CN211305284U (en) * | 2019-11-21 | 2020-08-21 | 深圳市海瀚新能源技术有限公司 | Utmost point ear welding set |
| CN112234210A (en) * | 2020-09-30 | 2021-01-15 | 江苏卓高新材料科技有限公司 | Composite current collector, preparation method thereof and battery |
| CN112751037A (en) * | 2021-02-07 | 2021-05-04 | 厦门海辰新能源科技有限公司 | Composite current collector, pole piece, battery and device using battery |
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