CN110224178B - Flexible battery and preparation method thereof - Google Patents

Flexible battery and preparation method thereof Download PDF

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Publication number
CN110224178B
CN110224178B CN201910519652.9A CN201910519652A CN110224178B CN 110224178 B CN110224178 B CN 110224178B CN 201910519652 A CN201910519652 A CN 201910519652A CN 110224178 B CN110224178 B CN 110224178B
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film layer
carbon nanotube
metal
riveting
tab
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CN110224178A (en
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李赫然
李青
唐赞谦
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Dongxu Optoelectronic Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/15—Nano-sized carbon materials
    • C01B32/158—Carbon nanotubes
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • 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

Abstract

The embodiment of the invention relates to a flexible battery and a preparation method thereof, relates to the technical field of batteries, and mainly aims to provide a bending-resistant flexible battery. The main technical scheme adopted is as follows: the preparation method of the flexible battery comprises the following steps: preparing a carbon nanotube flexible battery cell based on the carbon nanotube film layer; and riveting the metal tab with the carbon nanotube film layer of the carbon nanotube flexible battery cell to prepare the flexible battery. Compared with a lithium ion battery, the carbon nano tube film layer has good mechanical bending performance and electrochemical performance, and is good in bending resistance when used as a current collector, and the bending resistance of the carbon nano tube film layer can be further improved by adopting a riveting mode due to the fact that the difference between the melting points of the metal lug and the carbon nano tube is large.

Description

Flexible battery and preparation method thereof
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a flexible battery and a preparation method thereof.
Background
The lithium ion battery is used as a green and environment-friendly new energy source, has the advantages of good reliability, high safety, small volume, light weight and the like, and is widely applied to the fields of digital products, electric automobiles, military products and the like at present. With the strong support of new energy in China, the development of lithium ion batteries is vigorous.
The lithium ion battery comprises a lithium ion battery core and a positive and negative electrode lug, wherein the positive and negative electrode lug is connected with the battery core in a welding way. Due to the limitation of the physical properties of the lithium ion battery cell, the shape of the lithium ion battery cell cannot maintain good electrochemical performance after being bent, even the short circuit of the positive electrode and the negative electrode occurs, and the lithium ion battery cell cannot meet the requirements of flexible and foldable properties.
Disclosure of Invention
In view of this, embodiments of the present invention provide a flexible battery and a method for manufacturing the same, and mainly aim to provide a flexible battery with bending resistance.
In order to achieve the above purpose, the embodiments of the present invention mainly provide the following technical solutions:
in one aspect, an embodiment of the present invention provides a method for manufacturing a flexible battery, including:
preparing a carbon nanotube flexible battery cell based on the carbon nanotube film layer;
and riveting the metal tab with the carbon nanotube film layer of the carbon nanotube flexible battery cell to prepare the flexible battery.
The purpose of the embodiments of the present invention and the technical problems solved thereby can be further realized by the following technical measures.
Optionally, the method for manufacturing a flexible battery, in which the metal tab is riveted to the carbon nanotube film layer of the carbon nanotube flexible battery cell, includes:
laminating the metal tab and the carbon nanotube film layer, wherein the metal tab comprises at least one riveting area and a non-riveting area;
punching a riveting area of the metal lug and penetrating the carbon nano tube film layer to enable a first part of metal material of the riveting area to penetrate through the hole and a second part of metal material of the riveting area to be punched to one side of the carbon nano tube film layer;
and pressing the second part of metal material on one side of the carbon nanotube film layer to enable the carbon nanotube film layer to be riveted between the non-riveting area and the pressed second part of metal material.
Optionally, in the preparation method of the flexible battery, the number of the riveting regions is multiple, and the multiple riveting regions are sequentially arranged in the extending direction of the metal tab.
Optionally, in the preparation method of the flexible battery, the pressing the second part of the metal material on one side of the carbon nanotube film layer specifically includes:
and pressing the laminated metal lug and the carbon nano tube film layer, flattening the second part of metal material, and extending the second part of metal material towards the periphery of the hole.
Optionally, in the preparation method of the flexible battery, the metal tab includes a nickel-made negative tab and an aluminum-made positive tab, the carbon nanotube film layer of the carbon nanotube flexible battery cell includes a first film layer coated with a positive active material and a second film layer coated with a negative active material, and the metal tab is riveted with the carbon nanotube film layer of the carbon nanotube flexible battery cell, which includes:
riveting the positive tab and the first film layer, and riveting the negative tab and the second film layer.
In another aspect, embodiments of the present invention provide a flexible battery including:
a carbon nanotube flexible electrical core prepared based on the carbon nanotube film layer;
and the metal tab is riveted with the carbon nanotube film layer of the carbon nanotube flexible battery cell.
The purpose of the embodiments of the present invention and the technical problems solved thereby can be further realized by the following technical measures.
Optionally, in the flexible battery, the metal tab is stacked on the carbon nanotube film, the metal tab includes at least one riveting area and a non-riveting area, the riveting area is punched through the carbon nanotube film, a first part of metal material of the riveting area penetrates through the hole, a second part of metal material of the riveting area is located on one side of the carbon nanotube film, and the carbon nanotube film is riveted between the non-riveting area and the pressed second part of metal material.
Optionally, in the flexible battery, the riveting region is multiple, and the multiple riveting regions are sequentially arranged in the extending direction of the metal tab.
Optionally, in the flexible battery, the second portion of the metal material extends toward the periphery of the hole.
Optionally, in the flexible battery, the metal tab includes a nickel negative tab and an aluminum positive tab, the carbon nanotube film layer of the carbon nanotube flexible battery cell includes a first film layer coated with a positive active material and a second film layer coated with a negative active material, the positive tab is riveted with the first film layer, and the negative tab is riveted with the second film layer.
By the technical scheme, the flexible battery and the preparation method thereof provided by the technical scheme of the invention at least have the following advantages:
in the technical scheme provided by the embodiment of the invention, the battery cell is prepared based on the carbon nano tube film layer, the metal lug is riveted with the carbon nano tube film layer of the carbon nano tube flexible battery cell, compared with a lithium ion battery, the carbon nano tube film layer has good mechanical bending performance and electrochemical performance, and the bending resistance of the carbon nano tube film layer as a current collector is better, and the bending resistance of the carbon nano tube film layer can be further improved by adopting a riveting mode due to the large difference of the melting points of the metal lug and the carbon nano tube.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the embodiments of the present invention more clear and clear, and to implement the technical solutions according to the contents of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flow chart of a method for manufacturing a flexible battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first view angle of a metal tab of a flexible battery riveted to a carbon nanotube film layer of a carbon nanotube flexible electrical core according to an embodiment of the present invention;
fig. 3 is a structural diagram of a second view angle of a metal tab of a flexible battery riveted to a carbon nanotube film layer of a carbon nanotube flexible electrical core according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a metal tab of a flexible battery according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the purpose of the predetermined embodiments of the invention, the following detailed description is provided for the flexible battery and the preparation method thereof, the specific implementation manner, the structure, the features and the effects thereof according to the embodiments of the present invention with reference to the accompanying drawings and the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Fig. 1 is a schematic diagram of an embodiment of a method for manufacturing a flexible battery according to the present invention, and referring to fig. 1, the method for manufacturing a flexible battery according to the present invention includes:
s10, preparing a carbon nanotube flexible battery cell based on the carbon nanotube film;
carbon nanotubes, also known as buckytubes, are one-dimensional quantum materials with a special structure (radial dimension is nanometer magnitude, axial dimension is micrometer magnitude, both ends of the tube are basically sealed). Carbon nanotubes are coaxial circular tubes consisting of several to tens of layers of carbon atoms arranged in a hexagonal pattern.
In implementation, the first film layer of the carbon nanotube flexible battery cell can be prepared by coating the positive active material on the carbon nanotube film layer, and the second film layer of the carbon nanotube flexible battery cell can be prepared by coating the negative active material on the carbon nanotube film layer. And preparing the carbon nano tube flexible battery cell from the first film layer and the second film layer.
And S20, riveting the metal tab with the carbon nanotube film layer of the carbon nanotube flexible battery cell to prepare the flexible battery.
Specifically, the metal tab includes a negative electrode tab made of nickel and an aluminum positive electrode tab, the carbon nanotube film layer of the carbon nanotube flexible battery cell includes a first film layer coated with a positive electrode active material and a second film layer coated with a negative electrode active material, and the metal tab is riveted with the carbon nanotube film layer of the carbon nanotube flexible battery cell, which may include: riveting the positive tab and the first film layer, and riveting the negative tab and the second film layer. The positive tab is used as the positive electrode of the flexible battery, and the negative tab is used as the negative electrode of the flexible battery.
In the technical scheme provided by the embodiment of the invention, the battery cell is prepared based on the carbon nano tube film layer, the metal lug is riveted with the carbon nano tube film layer of the carbon nano tube flexible battery cell, compared with a lithium ion battery, the carbon nano tube film layer has good mechanical bending performance and electrochemical performance, and the bending resistance of the carbon nano tube film layer as a current collector is better, and the bending resistance of the carbon nano tube film layer can be further improved by adopting a riveting mode due to the large difference of the melting points of the metal lug and the carbon nano tube.
During the riveting of the carbon nanotube rete of metal lug and the flexible electric core of carbon nanotube, can realize through modes such as rivet, in order to make flexible battery satisfy ultra-thin demand, can realize the riveting through metal lug, with metal lug with the riveting of the carbon nanotube rete of the flexible electric core of carbon nanotube, include:
laminating the metal tab and the carbon nanotube film layer, wherein the metal tab comprises at least one riveting area and a non-riveting area;
punching a riveting area of the metal lug and penetrating the carbon nano tube film layer to enable a first part of metal material of the riveting area to penetrate through the hole and a second part of metal material of the riveting area to be punched to one side of the carbon nano tube film layer;
when the riveting area is a plurality of areas, the riveting areas can be punched respectively or at one time. The plurality of riveting regions may be sequentially arranged in the extending direction of the metal tab, and may be in a single row, a plurality of rows, and the like.
And pressing the second part of metal material on one side of the carbon nanotube film layer to enable the carbon nanotube film layer to be riveted between the non-riveting area and the pressed second part of metal material.
And in the pressing process, the laminated metal tab and the carbon nano tube film layer are pressed oppositely, and the second part of metal material is flattened so as to extend towards the periphery of the hole. In some implementations, the metal tab and the carbon nanotube film layer stacked in an opposite-pressing manner include a first opposite-pressing portion and a second opposite-pressing portion, the first opposite-pressing portion presses one side of the metal tab in an opposite-pressing manner, and the second opposite-pressing portion presses one side of the carbon nanotube film layer in an opposite-pressing manner. The pressing surface of the first pressing part can be a plane or a groove surface with a preset shape, so that the second part of metal material is pressed into the preset shape. And in the pressing, pressing the groove surface towards the second part of the metal material. In the recess face, a cylinder may also be provided facing the punch hole, which prevents the second part of the metal material from being pressed into the punch hole.
Fig. 2 to 4 show an embodiment of a flexible battery provided in the present invention, and referring to fig. 2 to 4, a flexible battery provided in an embodiment of the present invention includes: a carbon nanotube flexible cell prepared based on the carbon nanotube film layer 10, and a metal tab 20. And the metal tab 20 is riveted with the carbon nanotube film layer 10 of the carbon nanotube flexible battery cell.
In the technical scheme provided by the embodiment of the invention, the battery cell is prepared based on the carbon nano tube film layer, the metal lug is riveted with the carbon nano tube film layer of the carbon nano tube flexible battery cell, compared with a lithium ion battery, the carbon nano tube film layer has good mechanical bending performance and electrochemical performance, and the bending resistance of the carbon nano tube film layer as a current collector is better, and the bending resistance of the carbon nano tube film layer can be further improved by adopting a riveting mode due to the large difference of the melting points of the metal lug and the carbon nano tube.
In carrying out riveting tensile test, 10 riveting point locations have been carried out tensile test, and the following tensile test table of result:
Figure BDA0002096252830000061
according to the test result, the tensile force can reach more than 1kgf, and the tensile force requirement of the flexible battery is met.
The coating of the carbon nanotube film with the positive active material can prepare a first film of the carbon nanotube flexible cell, and the coating of the carbon nanotube film with the negative active material can prepare a second film of the carbon nanotube flexible cell. And preparing the carbon nano tube flexible battery cell from the first film layer and the second film layer. The metal tab comprises a nickel-made negative electrode tab and an aluminum positive electrode tab, the carbon nanotube film layer of the carbon nanotube flexible battery cell comprises a first film layer coated with a positive active material and a second film layer coated with a negative active material, the positive electrode tab is riveted with the first film layer, and the negative electrode tab is riveted with the second film layer to form the flexible battery. The melting point of nickel is about 1453 ℃, the melting point of aluminum is about 660.37 ℃, the carbon nano tube film layer is converted into ash when the temperature reaches above 500 ℃, and the nickel negative electrode lug and the aluminum positive electrode lug can be respectively and firmly connected with the carbon nano tube film layer by a riveting method.
If the metal lug and the carbon nanotube film layer of the carbon nanotube flexible electric core are riveted through the rivet, the riveting caps on the two sides of the rivet are respectively riveted with the metal lug and the carbon nanotube film layer of the carbon nanotube flexible electric core, so that the flexible battery is thicker in thickness. In some embodiments, in a specific implementation, the metal tab 20 is stacked on the carbon nanotube film layer 10, the metal tab 20 includes at least one riveting region and a non-riveting region, the riveting region punch 21 penetrates through the carbon nanotube film layer 10, a first part of the metal material 20a of the riveting region penetrates through the hole, a second part of the metal material 20b of the riveting region is located on one side of the carbon nanotube film layer, and the carbon nanotube film layer 10 is riveted between the non-riveting region and the second part of the metal material 20b which is pressed. The number of the riveting areas can be one, or the number of the riveting areas is multiple, and the plurality of the riveting areas are sequentially arranged in the extending direction of the metal tab.
The second part of metal material 20b may extend in the circumferential direction of the hole to form a rivet cap, and the rivet cap may have a petal shape, a circular shape, a rectangular shape, or the like.
Specifically, the flexible battery described in this embodiment may be directly prepared by using the preparation method of the flexible battery provided in the foregoing embodiment, and specific implementation structures may refer to relevant contents described in the foregoing embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed apparatus should not be construed to reflect the intent as follows: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the components of the apparatus of the embodiments may be adapted and arranged in one or more arrangements different from the embodiments. The components of the embodiments may be combined into one component and, in addition, they may be divided into a plurality of sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the components of any apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination. The various component embodiments of the present invention may be implemented in hardware, or in a combination thereof.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or components not listed in a claim. The word "a" or "an" preceding a component or element does not exclude the presence of a plurality of such components or elements. The invention may be implemented by means of an apparatus comprising several distinct elements. In the claims enumerating several means, several of these means may be embodied by one and the same item. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (4)

1. A method of making a flexible battery, comprising:
preparing a carbon nanotube flexible battery cell based on the carbon nanotube film layer;
riveting a metal tab with a carbon nanotube film layer of the carbon nanotube flexible battery cell to prepare a flexible battery;
riveting a metal tab with a carbon nanotube film layer of the carbon nanotube flexible electrical core, comprising:
laminating the metal tab and the carbon nanotube film layer, wherein the metal tab comprises at least one riveting area and a non-riveting area;
punching a riveting area of the metal lug and penetrating the carbon nano tube film layer to enable a first part of metal material of the riveting area to penetrate through the hole and a second part of metal material of the riveting area to be punched to one side of the carbon nano tube film layer;
pressing the second part of metal material on one side of the carbon nanotube film layer to rivet the carbon nanotube film layer between the non-riveted area and the pressed second part of metal material, pressing the laminated metal tab and the carbon nanotube film layer, flattening the second part of metal material to extend the second part of metal material towards the periphery of the hole, the oppositely-pressed and laminated metal tab and the carbon nano tube film layer comprise a first oppositely-pressed part and a second oppositely-pressed part, the first oppositely-pressed part oppositely presses one side of the metal tab, the second oppositely-pressed part oppositely presses one side of the carbon nano tube film layer, the oppositely-pressed surface of the first oppositely-pressed part is a groove surface with a preset shape, so that the second portion of metal material is pressed into a predetermined shape, in which pressing the groove face, in which the cylinder facing the punched hole is arranged, is pressed towards the second portion of metal material.
2. The method for manufacturing a flexible battery according to claim 1,
the plurality of riveting areas are arranged in the extending direction of the metal tab in sequence.
3. The method for manufacturing a flexible battery according to claim 1, wherein the second portion of the metal material is pressed on one side of the carbon nanotube film layer, specifically:
and pressing the laminated metal lug and the carbon nano tube film layer, flattening the second part of metal material, and extending the second part of metal material towards the periphery of the hole.
4. The method of any one of claims 1-3, wherein the metal tab comprises a negative electrode tab made of nickel and a positive electrode tab made of aluminum, the carbon nanotube film layer of the carbon nanotube flexible cell comprises a first film layer coated with a positive electrode active material and a second film layer coated with a negative electrode active material, and the metal tab is riveted with the carbon nanotube film layer of the carbon nanotube flexible cell, comprising:
riveting the positive tab and the first film layer, and riveting the negative tab and the second film layer.
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