CN219513135U - Composite current collector, electrode plate and battery - Google Patents
Composite current collector, electrode plate and battery Download PDFInfo
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- CN219513135U CN219513135U CN202320793659.1U CN202320793659U CN219513135U CN 219513135 U CN219513135 U CN 219513135U CN 202320793659 U CN202320793659 U CN 202320793659U CN 219513135 U CN219513135 U CN 219513135U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a composite current collector, an electrode plate and a battery, wherein the composite current collector comprises a matrix layer and a conductive layer; the conductive layers are arranged on the two opposite side surfaces of the substrate layer; a plurality of linear structures are disposed between at least one of the conductive layers and the base layer. According to the utility model, the plurality of line structures are arranged between the conductive layer and the substrate layer, and the line structures form a plurality of meshes between the substrate layer and the conductive layer, so that the surface area of the substrate layer is increased, the contact area of the conductive layer and the substrate layer is increased, the binding force between the conductive layer and the substrate layer is improved, the phenomenon that the conductive layer falls off can be effectively avoided, and the stability of the composite current collector is improved.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a composite current collector, an electrode plate and a battery.
Background
The lithium ion battery has the advantages of high energy density, high cycle performance, high voltage, low self-discharge, light weight and the like, and is widely applied to portable electronic equipment (such as mobile phones, digital cameras, notebook computers and the like) and large and medium-sized electric equipment such as electric automobiles, electric bicycles, electric tools and the like. With the increasing requirements for electronic products and new energy automobiles, the requirements for the safety performance of lithium ion batteries are also increasing.
The current collector is the carrier of the active material in the battery and is an important component of the battery. The traditional current collector takes a single metal foil as the current collector, and the current collector has poor toughness, mechanical property and mechanical property in the use process, so that the safety of the battery is reduced. The traditional single metal foil current collector is modified into the composite current collector comprising the polymer layer, so that the toughness of the current collector can be enhanced, the current collector has higher mechanical property and mechanical property, and the safety performance of the battery is further improved. However, the adhesion of the metal layer on the polymer layer is poor due to the large difference between the polymer material and the metal material, and the connection between the metal layer and the polymer layer is not tight. Along with the stress accumulation caused by the expansion of the pole piece in the battery circulation process, the metal layer has the risk of stripping and separating, and the safety of the battery is affected.
Disclosure of Invention
The utility model aims to solve the problem that a metal layer in the existing composite current collector is easy to fall off.
In order to solve the above problems, a first aspect of the present utility model provides a composite current collector, including a base layer and a conductive layer;
the conductive layers are arranged on two opposite side surfaces of the substrate layer;
a plurality of linear structures are disposed between at least one of the conductive layers and the base layer.
Further, the line-shaped structure forms a plurality of mesh openings between the conductive layer and the base layer, the conductive layer filling the mesh openings.
Further, the linear structure is embedded on at least part of the surface of the substrate layer, and/or the linear structure is embedded on at least part of the surface of the conductive layer.
Further, the linear structures are embedded in the matrix layer to a depth of greater than or equal to 0.2 μm and less than or equal to 3 μm, and/or the conductive layer is embedded in the matrix layer to a depth of greater than or equal to 0.2 μm and less than or equal to 3 μm.
Further, the matrix layer is a polymer layer.
Further, the substrate layer is a non-metallic conductive substrate layer, and the non-metallic conductive substrate layer contains a carbonaceous material.
Further, at least part of the linear structure is made of metal.
Further, one side surface of the substrate layer is provided with one conductive layer, and the conductive layer is continuously arranged on the substrate layer;
and/or, at least two conductive layers are arranged on one side surface of the substrate layer, and the at least two conductive layers are arranged on the substrate layer at intervals.
The second aspect of the utility model provides an electrode slice comprising an active material layer and the composite current collector, wherein the active material layer is arranged on the surface of the conductive layer and/or the surface of the matrix layer.
The third aspect of the utility model provides a battery comprising the electrode plate.
According to the composite current collector, the electrode pole piece and the battery, the plurality of linear structures are arranged between the conductive layer and the substrate layer, the plurality of meshes are formed between the substrate layer and the conductive layer by the linear structures, so that the surface area of the substrate layer is increased, the contact area between the conductive layer and the substrate layer is increased, the binding force between the conductive layer and the substrate layer is improved, the falling phenomenon of the conductive layer can be effectively avoided, and the stability of the composite current collector is improved; in addition, a plurality of linear structures are arranged between the conductive layer and the substrate layer, so that the mechanical strength of the composite current collector can be improved, and the safety of the battery under mechanical abuse conditions (such as needling or heavy impact and the like) is improved.
Drawings
Fig. 1 is a schematic structural view of a composite current collector according to an embodiment of the present utility model;
fig. 2 is a schematic structural view of a composite current collector according to an embodiment of the present utility model.
Reference numerals illustrate:
1-a substrate layer; a 2-conductive layer; 3-linear structure.
Detailed Description
The technical scheme of the utility model is clearly and thoroughly described below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. Furthermore, in the description of the utility model, the meaning of "at least one" is one or more.
In the description of the present specification, the term "on the basis of the above-described embodiment" means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same implementations or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1, the present embodiment provides a composite current collector including a base layer 1 and a conductive layer 2, the conductive layer 2 being disposed on opposite side surfaces of the base layer 1; a plurality of line structures 3 are arranged between at least one conductive layer 2 and the base layer 1, the line structures 3 forming a plurality of meshes between the base layer 1 and the conductive layer 2, the conductive layer 2 being filled in these meshes. As an alternative embodiment, one ends of the wire structures 3 are all embedded on the substrate layer 1, the other ends of the wire structures 3 are all embedded on the conductive layer 2, a plurality of meshes are formed between the wire structures 3, and the conductive layer 3 is filled in the meshes.
In the embodiment, the plurality of line structures are arranged between the conductive layer and the substrate layer, and the line structures form a plurality of meshes between the substrate layer and the conductive layer, so that the surface area of the substrate layer is increased, the contact area between the conductive layer and the substrate layer is increased, the binding force between the conductive layer and the substrate layer is improved, the phenomenon that the conductive layer falls off can be effectively avoided, and the stability of the composite current collector is improved; in addition, a plurality of linear structures are arranged between the conductive layer and the substrate layer, so that the mechanical strength of the composite current collector can be improved, and the safety of the battery under mechanical abuse conditions (such as needling or heavy impact and the like) is improved.
In this embodiment, a plurality of line structures 3 are arranged between the two conductive layers 2 and the base layer 1. The linear structures 3 may be uniformly distributed on the whole surfaces of the base layer 1 and the conductive layer 2, and the linear structures 3 may be disposed on part of the surfaces of the base layer 1 and the conductive layer 2, for example, the linear structures 3 may be disposed on the peripheral edges of the base layer 1 and the conductive layer 2, so as to increase the bonding force between the edges of the base layer 1 and the edges of the conductive layer 2. The linear structures 3 may be arranged regularly, or the linear structures 3 may be arranged irregularly. Preferably, the line structures 3 are irregularly arranged on the entire surfaces of the base layer 1 and the conductive layer 2 to increase the contact area between the conductive layer 2 and the base layer 1.
In this embodiment, the depth of the linear structures 3 embedded in the matrix layer 1 may be greater than or equal to 0.2 μm and less than or equal to 3 μm, and the depth of the linear structures 3 embedded in the conductive layer 2 may be greater than or equal to 0.2 μm and less than or equal to 3 μm, whereby the bonding of the linear structures 3 and the matrix layer 1 can be made more firm and the bonding of the linear structures 3 and the conductive layer 2 can be made more firm, thereby further improving the bonding strength between the conductive layer 2 and the matrix layer 1.
As an alternative embodiment, the linear structure 3 may be connected to the base layer 1 by high-temperature pressing, where the base layer 1 has viscosity after being softened by heating at high temperature, and can be bonded to the linear structure 3, so that the linear structure 3 is embedded in the base layer 1.
In this embodiment, the length of the wire 3 is greater than the diameter of the wire 3, preferably the diameter of the wire 3 is less than or equal to 2 μm and the length of the wire 3 is greater than or equal to 2 μm.
In this embodiment, the line-shaped structure 3 may be bent to further increase the contact area between the conductive layer 2 and the base layer 1, thereby further improving the bonding force between the conductive layer 2 and the base layer 1. The linear structure 3 may be made of metal and/or non-metal, and the linear structure 3 may be bent, if the linear structure 3 is made of metal, the material of the linear structure 3 may be one or more of Li, al, ag, au, ti, V, mn, fe, co, ni, cu, zn, mo, W, na, K, mg, ca, sr, ba, ga, in, ge, sn, la, and if the linear structure 3 is made of non-metal, the material of the linear structure 3 may be carbon fiber. As an alternative embodiment, the wire structure 3 is an aluminum wire, a copper wire, a silver wire or a copper wire and a carbon fiber.
In this embodiment, the substrate layer 1 is a polymer layer, wherein the polymer is an insulating material, and the polymer may be one or more selected from polyoxymethylene, polyethylene, polyvinylmethyl ether, polyvinylethyl ether, ethylene-propylene copolymer, polyvinyl alcohol, polyvinyl acetate, polyvinylidene fluoride-hexafluoropropylene copolymer, polyvinyl chloride, polyvinylidene chloride, polypropylene, polyacrylic acid, polymethyl methacrylate, polyethyl acrylate, poly (α -butyl cyanoacrylate), polyacrylonitrile, polyisobutenyl rubber, neoprene, natural rubber, ancient tower rubber, styrene-butadiene rubber, polydecylene formamide, polyhexamethylene adipamide, polyhexamethylene sebacamide, polyethylene terephthalate, polyethylene oxide, polyphenylene sulfide, poly [ bis (trifluoroethoxy) phosphazene ], polydimethyl siloxane, polyvinylcarbazole, polytetrafluoroethylene, polyacrylamide, and polycarbonate.
If the base layer 1 is a polymer layer, the linear structure 3 may be made of a metal material, the linear structure 3 may be made of a non-metal material, or the linear structure 3 may be made of a mixture of a metal material and a non-metal material.
The use of the polymer layer as the matrix layer 1 affects the conductivity of the composite current collector, so that, based on the above embodiment, the matrix layer 1 is a non-metal conductive matrix layer, and thus, the use of the non-metal conductive matrix layer in this embodiment can improve the electron conductivity of the composite current collector, thereby facilitating the conduction of current in the composite current collector, and improving the conductivity of the composite current collector.
Specifically, the nonmetallic conductive base layer includes a nonmetallic conductive material, which may be a carbonaceous material, for example: at least one of artificial graphite, natural graphite, mesophase carbon microspheres, graphene, hard carbon, soft carbon, C60, C70, carbon black, carbon fiber, carbon nanotube, petroleum coke and asphalt.
On the basis of the embodiment, the content of the carbon element in the non-metal conductive matrix layer is not lower than 75%, so that the high content of the carbon in the non-metal conductive matrix layer can improve the toughness of the non-metal conductive matrix layer, the safety of the battery under mechanical abuse conditions (such as needling or heavy impact and the like) is further improved, and the high content of the carbon in the non-metal conductive matrix layer can improve the electronic conduction capability of the composite current collector.
If the matrix layer 1 is a non-metal conductive matrix layer, at least part of the linear structure 3 is made of metal, so that electron conduction in the current collector can be promoted, and conductivity of the composite current collector can be improved.
In this embodiment, the non-metal conductive substrate layer further includes an adhesive material, where the adhesive material can bond the non-metal conductive materials together, and the adhesive material may be at least one of polyethylene oxide, polyvinylidene fluoride-hexafluoropropylene copolymer, polytetrafluoroethylene, polyacrylic acid, carboxymethyl cellulose, polystyrene-butadiene copolymer, and rubber.
One side surface of the substrate layer is provided with one conductive layer, and the conductive layer is continuously arranged on the substrate layer;
and/or, at least two conductive layers are arranged on one side surface of the substrate layer, and the at least two conductive layers are arranged on the substrate layer at intervals.
In this embodiment, if the substrate layer 1 is a polymer layer, the conductive layer 2 is continuously disposed on the surface of the substrate layer 1; if the substrate layer 1 is a nonmetallic conductive substrate layer, the conductive layers 2 may be continuously disposed on the surface of the substrate layer 1, or the conductive layers 2 may be disposed on the surface of the substrate layer 1 at intervals. As shown in fig. 1, each side surface of the base layer 1 may be provided with one conductive layer 2, and two conductive layers 2 are continuously provided on both side surfaces of the base layer 1, respectively; each side surface of the substrate layer 2 may also be provided with at least two conductive layers 2, and at least two conductive layers 2 are each provided on each side surface of the substrate layer 1 at intervals; as shown in fig. 2, a conductive layer 2 may be further disposed on one side surface of the base layer 2, the conductive layer 2 is continuously disposed on one side surface of the base layer 1, at least two conductive layers 2 are disposed on the other side surface of the base layer 2, and at least two conductive layers 2 are disposed on the other side surface of the base layer 1 at intervals. The conductive layers 2 are continuously arranged on the substrate layer 1, so that the uniformity of coating of the active material layers is facilitated, the conductive layers 2 are arranged on the substrate layer 1 at intervals, the intervals between the conductive layers 2 can be filled with the active material layers, and the energy density of the battery is facilitated to be improved.
In this embodiment, the conductive layer 2 may be formed by a coating method, a vapor deposition method, a vacuum sputtering method, a vacuum plating method, an electroplating method, a hot pressing method, or the like, and the conductive layer 2 is filled in the recesses formed in the line structure. The conductive layer 2 has good electron conducting capability, and the material of the conductive layer 2 can be one or more selected from aluminum, copper, nickel, iron, titanium, silver, gold, cobalt, chromium, molybdenum and tungsten.
The embodiment also provides an electrode plate, which comprises the composite current collector in any one of the cases.
In this embodiment, the electrode pad further includes an active material layer disposed on the surface of the conductive layer 2 and/or the surface of the base layer 1, where the active material layer disposed on the surface of the conductive layer 2 means that the active material layer is disposed on the surface of the conductive layer 2 facing away from the base layer 1. If the composite current collector is a negative electrode sheet, the active material layer is a negative electrode active material layer, and if the composite current collector is a positive electrode sheet, the active material layer is a positive electrode active material layer. The kind of the positive electrode active material in the positive electrode active material layer is not further limited in this embodiment, and the positive electrode active material may be one or more of lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, nickel cobalt manganese ternary material, and nickel cobalt aluminum ternary material, for example. The kind of the anode active material in the anode active material layer is not further limited in this embodiment, and the anode active material may be one or more of lithium metal, natural graphite, artificial graphite, hard carbon, soft carbon, and silicon-based materials, for example.
In this embodiment, the active material layer further includes a conductive agent and a binder, and the conductive agent may be one or more selected from graphite, acetylene black, carbon black, ketjen black, carbon nanotubes, graphene, and carbon nanofibers; the binder may be selected from one or more of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBR), nitrile-butadiene rubber (NBR), aqueous acrylic resin, polyvinyl alcohol, carboxymethyl cellulose (CMC), polyacrylic acid (PAA).
There is also provided a battery including the electrode tab of any of the above cases in this embodiment. The battery may be a lithium ion battery, a lithium polymer battery, or the like.
In order to illustrate the improvement of the binding force between the conductive layer 2 and the substrate layer 1 by the line structure 3, this embodiment shows an example of a control experiment, which includes four groups of experimental groups and two groups of control groups, wherein the control groups and the experimental groups are identical in other variables such as dimensions except for the material settings of the current collectors, and the control groups and the experimental groups are specifically set as follows:
experiment group 1: covering aluminum wires on two opposite side surfaces of the PET film, compounding the aluminum wires on the surface of the PET film by hot pressing at 165 ℃, and covering one aluminum layer on two side surfaces of the PET film by a vacuum evaporation method respectively to enable the aluminum wires to be embedded between the PET film and the aluminum layer, thereby obtaining the compound current collector.
The composite current collector is used as a positive electrode current collector, and a positive electrode active material layer is coated on the surface of the positive electrode current collector to obtain a positive electrode plate; the method comprises the steps of taking copper foil as a negative electrode current collector, and coating a negative electrode active material layer on the surface of the negative electrode current collector to obtain a negative electrode plate; and stacking and winding the positive plate, the negative plate and the diaphragm to obtain a battery cell, filling the battery cell into an aluminum plastic film, sealing, injecting electrolyte, aging, forming, sorting and the like to obtain the lithium battery.
Experiment group 2: PE and PET are mixed according to the mass ratio of 1:3, mixing, extruding at high temperature to form a film to obtain a substrate layer 1, covering copper wires on the surfaces of two opposite sides of the substrate layer 1, compounding the copper wires on the surface of the substrate layer 1 by hot pressing at 165 ℃, and covering a copper layer on the surfaces of two sides of the substrate layer 1 by a vacuum evaporation method respectively to enable the copper wires to be embedded between the substrate layer 1 and the copper layer, thereby obtaining the compound current collector.
The composite current collector is used as a negative current collector, and a negative active material layer is coated on the surface of the negative current collector to obtain a negative plate; coating an anode active material layer on the surface of an anode current collector by taking aluminum foil as the anode current collector to obtain an anode plate; the lithium battery was prepared by the method of experiment group 1.
Experiment group 3: PE and PET are mixed according to the mass ratio of 1:3, mixing, extruding at high temperature to form a film to obtain a substrate layer 1, taking copper wires and carbon fibers as linear structures 3, covering the linear structures 3 on the two opposite side surfaces of the substrate layer 1, compounding the linear structures 3 on the surface of the substrate layer 1 by hot pressing at 165 ℃, and covering a copper layer on the two side surfaces of the substrate layer 1 respectively by a vacuum evaporation method to enable the linear structures 3 to be embedded between the substrate layer 1 and the copper layer, thereby obtaining the composite current collector.
The composite current collector is used as a negative current collector, and a negative active material layer is coated on the surface of the negative current collector to obtain a negative plate; coating an anode active material layer on the surface of an anode current collector by taking aluminum foil as the anode current collector to obtain an anode plate; the lithium battery was prepared by the method of experiment group 1.
Experiment group 3: PE and PET are mixed according to the mass ratio of 1:3, mixing, extruding at high temperature to form a film to obtain a substrate layer 1, covering silver wires on two opposite side surfaces of the substrate layer 1, compounding the silver wires on the surface of the substrate layer 1 by hot pressing at 165 ℃, and covering copper layers on two side surfaces of the substrate layer 1 respectively by a vacuum evaporation method to enable the silver wires to be embedded between the substrate layer 1 and the copper layers to obtain the compound current collector.
The composite current collector is used as a negative current collector, and a negative active material layer is coated on the surface of the negative current collector to obtain a negative plate; coating an anode active material layer on the surface of an anode current collector by taking aluminum foil as the anode current collector to obtain an anode plate; the lithium battery was prepared by the method of experiment group 1.
Control group 1: coating an anode active material layer on the surface of an anode current collector by taking aluminum foil as the anode current collector to obtain an anode plate; the method comprises the steps of taking copper foil as a negative electrode current collector, and coating a negative electrode active material layer on the surface of the negative electrode current collector to obtain a negative electrode plate; the lithium battery was prepared by the method of experiment group 1.
Control group 2: a conventional composite current collector is adopted as a positive current collector, namely a linear structure 3 is not arranged between a substrate layer 1 and a conductive layer 2, PET is adopted as the substrate layer 1, and the conductive layers 2 are arranged on the surfaces of two sides of the substrate layer 1; the method comprises the steps of taking copper foil as a negative electrode current collector, and coating a negative electrode active material layer on the surface of the negative electrode current collector to obtain a negative electrode plate; the lithium battery was prepared by the method of experiment group 1.
The battery cells prepared by the groups are subjected to the following performance tests, wherein the test process is as follows:
(1) Peel force test method: discharging the battery cell to 0% SOC, cutting the pole piece into a rectangle with the width of 24mm, fixing one side on the surface of the hard flat plate through double-sided adhesive tape, covering the other side with transparent adhesive tape, stripping the transparent adhesive tape by 180 degrees, and recording the tensile force value.
(2) The method for testing the internal resistance of the battery cell comprises the following steps: the AC internal resistance meter was used for testing, the AC frequency was 1000Hz.
(3) The weight impact test method comprises the following steps: stainless steel columns with the diameter of 15.8mm and the mass of 9.1kg are used for freely falling at the height of 610mm to impact the middle position of the battery cell.
Table 1 test results of experimental and control groups
As can be seen from table 1, compared with the conventional metal foil current collector, the present embodiment can significantly improve the safety of the battery cell by adding the linear structure 3 between the substrate layer 1 and the conductive layer 2; in addition, compared with the conventional composite current collector, the linear structure 3 is added between the substrate layer 1 and the conductive layer 2, so that the safety of the battery cell is improved, the adhesive force of the conductive layer 2 in the composite current collector can be obviously improved, the falling phenomenon of the conductive layer 2 can be effectively avoided, and the stability of the composite current collector is improved.
In one specific embodiment, the battery is manufactured as follows:
the positive electrode active material layer is prepared from lithium cobaltate, a conductive agent and a binder in a mass ratio of 97:1.5: 1.5; and then coating the positive electrode active material on the surface of a positive electrode current collector through coating equipment, and then drying, rolling and cutting to obtain the positive electrode plate.
The negative electrode active material is graphite, a conductive agent and a binder in a mass ratio of 96:1: 3; and then coating the negative electrode active material on the surface of a negative electrode current collector through coating equipment, and then drying, rolling and cutting to obtain the negative electrode plate.
The PE separator had a thickness of 8. Mu.m.
And sequentially stacking the positive plate, the diaphragm and the negative plate together, winding to form a winding core, packaging with an aluminum plastic film to form a battery core, performing the procedures of liquid injection, aging, formation, secondary packaging and the like to obtain the battery, and finally testing the electrochemical performance of the battery. Wherein the mass ratio of EC to DEC to EMC in the electrolyte is 2:3:5, and the lithium salt is LiPF 6 The lithium salt concentration was 1mol/L.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.
Claims (10)
1. The composite current collector is characterized by comprising a substrate layer and a conductive layer;
the conductive layers are arranged on two opposite side surfaces of the substrate layer;
a plurality of linear structures are disposed between at least one of the conductive layers and the base layer.
2. The composite current collector of claim 1 wherein said wire-like structure forms a plurality of mesh openings between said conductive layer and said base layer, said conductive layer filling said mesh openings.
3. The composite current collector of claim 1 wherein the linear structures are embedded on at least a portion of the surface of the base layer and/or the linear structures are embedded on at least a portion of the surface of the conductive layer.
4. A composite current collector according to claim 3 wherein the linear structures are embedded within the matrix layer to a depth of greater than or equal to 0.2 μm and less than or equal to 3 μm and/or the linear structures are embedded within the conductive layer to a depth of greater than or equal to 0.2 μm and less than or equal to 3 μm.
5. The composite current collector of claim 1 wherein said matrix layer is a polymer layer.
6. The composite current collector of claim 1 wherein said matrix layer is a non-metallic conductive matrix layer comprising a carbonaceous material.
7. The composite current collector of claim 6 wherein at least a portion of said wire structure is a metallic material.
8. The composite current collector of claim 6 wherein one side surface of said base layer is provided with one of said conductive layers, said conductive layers being disposed continuously on said base layer;
and/or, at least two conductive layers are arranged on one side surface of the substrate layer, and the at least two conductive layers are arranged on the substrate layer at intervals.
9. An electrode sheet comprising an active material layer and a composite current collector according to any one of claims 1 to 8, the active material layer being provided on the surface of the conductive layer and/or the surface of the base layer.
10. A battery comprising the electrode sheet of claim 9.
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| CN202320793659.1U CN219513135U (en) | 2023-04-12 | 2023-04-12 | Composite current collector, electrode plate and battery |
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| CN202320793659.1U CN219513135U (en) | 2023-04-12 | 2023-04-12 | Composite current collector, electrode plate and battery |
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