CN112002933B - Preparation method of flexible battery pack and prepared flexible battery pack - Google Patents
Preparation method of flexible battery pack and prepared flexible battery pack Download PDFInfo
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- CN112002933B CN112002933B CN202011039358.7A CN202011039358A CN112002933B CN 112002933 B CN112002933 B CN 112002933B CN 202011039358 A CN202011039358 A CN 202011039358A CN 112002933 B CN112002933 B CN 112002933B
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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
- H01M10/04—Construction or manufacture in general
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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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
- H01M10/058—Construction or manufacture
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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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
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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
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
- H01M10/286—Cells or batteries with wound or folded electrodes
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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
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
- H01M10/287—Small-sized flat cells or batteries for portable equipment
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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
- H01M10/24—Alkaline accumulators
- H01M10/30—Nickel accumulators
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a preparation method of a flexible battery pack, which relates to the technical field of battery preparation and comprises the following steps: (1) performing primary packaging on the winding core or the laminated core by adopting an aluminum plastic film, injecting electrolyte, and performing secondary packaging after formation to obtain a monomer battery core; (2) connecting the monomer battery cells prepared in the step (1) in parallel, in series or in series-parallel to form a battery pack; (3) and (3) putting the battery pack obtained in the step (2) into a mould, injecting a packaging material, and obtaining the flexible battery pack after the packaging material is polymerized. The invention also provides a battery prepared by the preparation method. The invention has the beneficial effects that: the flexible carrier is processed independently, so that the problem of safety of the battery pack caused by uneven distribution of the battery due to the fact that the battery sinks due to self weight when the flexible carrier and the battery pack are integrally formed is solved.
Description
Technical Field
The invention relates to the technical field of battery preparation, in particular to a preparation method of a flexible battery pack and the prepared flexible battery pack.
Background
With the continuous development of electronic technology, electronic components play an increasingly important role in human life, and electronic devices tend to be light, thin, small and intelligent. Flexible devices are becoming increasingly a new power source in the direction of being lightweight, thin, small, and intelligent, such as flexible screens, flexible cell phones, flexible wristwatches, and the like. The realization of flexible devices is pressing for the emergence of energy storage devices with flexibility and bendability.
Batteries currently on the market are typically packaged in four packaging ways: cylinder, square, button and soft package. The batteries prepared by the cylindrical, square and button methods in the four methods have no flexibility, the batteries prepared by the soft packaging method can be bent generally with the thickness of below 2mm, but after repeated bending, the positive and negative electrode materials fall off from the current collector, so that the performance of the batteries is influenced. For example, patent publication No. CN102544574A discloses a flexible lithium ion battery and a packaging method thereof, which uses one of aluminum plastic film, PDMS and PET to package the battery, thereby realizing the flexibility of the battery.
However, the flexible battery in the prior art has the following disadvantages: 1. the capacity of the battery is generally below 100mAh due to size limitation; 2. the performance of the battery is attenuated after repeated bending and folding, and the contact between the anode and cathode materials of the battery becomes not tight after folding, so that the internal resistance of the battery is increased, and the various performances of the battery are rapidly attenuated; 3. the positive and negative electrode materials of the battery are coated on the metal foil, and after the battery is bent for multiple times, the positive and negative electrode materials can fall off from the copper foil or the aluminum foil, and the diaphragm is pierced to cause short circuit of the battery, so that the safety problem is caused; 4. the diaphragm of the battery is porous organic matter, and the diaphragm is damaged after the battery is bent for multiple times, so that the safety problem caused by the contact short circuit of the anode and the cathode is caused.
There is also a method of assembling small battery packs into a battery pack and then packaging the battery pack using a flexible material in the prior art, but the packaging of the battery using a flexible material has the following disadvantages: firstly, when the battery pack is integrally packaged by using a chemical polymerization material, the battery pack can sink into the bottom of the packaging material due to the self weight, so that the battery pack is exposed outside the packaging material, and safety problems are easily caused; secondly, when the battery pack is integrally packaged, the position of the battery pack is difficult to fix in a specific area and needs to be continuously adjusted during production, so that the preparation process is complex and the effective efficiency is low. Thirdly, when the battery is integrally packaged, because the hardness of the used material is low, a thicker packaging layer is required, and the energy density of the battery is reduced; fourthly, when the battery is directly packaged by adopting the thermoplastic molding, the temperature is more than 150 ℃ during the thermoplastic molding and packaging, and the battery can be irreversibly degraded when being subjected to high temperature for a long time, so that the battery bulge fails.
Disclosure of Invention
The invention aims to solve the technical problem that the performance of a flexible battery in the prior art is influenced after the flexible battery is repeatedly bent, and provides a preparation method of a flexible battery pack.
The invention solves the technical problems through the following technical means:
a method of making a flexible battery comprising the steps of:
(1) packaging the coiled core or the stacked core for the first time by adopting an aluminum plastic film, injecting electrolyte, and packaging for the second time after formation to obtain a monomer battery core;
(2) preparing a battery pack: connecting the monomer battery cells prepared in the step (1) in parallel, in series or in series-parallel to form a battery pack, wherein the distance between adjacent monomer battery cells is 0-10 mm;
(3) packaging of the flexible battery pack: and (3) putting the battery pack obtained in the step (2) into a mould, then injecting a packaging material, and obtaining the flexible battery pack after the packaging material is polymerized.
Has the advantages that: according to the preparation method provided by the invention, when the distance between the adjacent monomer battery cells is larger than 0, the adjacent monomer battery cells are arranged at intervals, a gap is formed between the adjacent monomer battery cells, the packaging material is filled in the gap and covers the battery pack, and the prepared flexible battery pack can relieve stress generated during bending because of the buffering effect of the packaging material between the batteries, so that the performance of the battery is protected from being attenuated after being bent for many times.
By adopting the preparation method provided by the invention, the flexible battery pack with any shape and capacity can be prepared, so that the capacity of the flexible battery pack is not limited by the size.
The output voltage and the capacity of the battery are set through the internal winding core or the core stacking series-parallel connection, and the voltage of the battery is not limited by the voltage of a single traditional electric core.
The preparation method is simple to operate and can be directly finished outdoors from the first packaging.
Meanwhile, the single battery cell is placed in the groove of the flexible carrier, so that the safety problem of the battery pack caused by uneven distribution of the battery exposed outside the packaging material due to the weight of the battery due to the fact that the battery sinks when the flexible material and the battery pack are integrally formed is solved.
By adopting the preparation method, the process needing series operation can be carried out by adopting a parallel method, thereby improving the production efficiency and reducing the preparation cost of the product to a great extent.
The invention further adopts the flexible carrier for packaging, the flexible carrier and the packaging material are integrally formed, a thicker packaging layer is not needed, the energy density of the battery is improved, the battery is not in high temperature for a long time, and the bulge failure of the battery is prevented.
Preferably, the flexible carrier and the flexible cover plate are both made of a precursor material, and the precursor material comprises plastic, rubber, silicone grease or silica gel.
Preferably, the plastic comprises one or more of epoxy, polyvinyl chloride, polyurethane, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, polyethylene terephthalate, and polybutylene terephthalate.
Has the advantages that: the plastic in the invention has flexibility, so that the prepared battery pack has flexibility.
Preferably, the rubber comprises one or more of a polyolefin elastomer, a styrenic thermoplastic elastomer, a thermoplastic polyurethane elastomer, a thermoplastic elastomer.
Preferably, the encapsulating material comprises silicone, silicone grease, polydimethylsiloxane, or epoxy resin.
Has the advantages that: the heat-conducting and insulating non-flammable material is used for tightly packaging the positive electrode and the negative electrode of the battery, so that the short circuit of the single battery cells connected in series or in parallel due to the contact of the positive electrode and the negative electrode in the bending process can be effectively prevented, and the safety of the flexible battery pack is greatly improved.
Preferably, the flexible carrier is cuboid or dumbbell shaped.
Preferably, the packaging material further comprises an additive, wherein the additive is a colorant, a flame retardant or a lubricant, and the additive is added in an amount of 0-30% of the total amount of the packaging material.
Preferably, the precursor material further comprises an additive, wherein the additive is a coloring agent, an antistatic agent, an antioxidant, a flame retardant or a lubricant, and the additive amount of the additive is 0-30% of the total amount of the packaging material.
Preferably, tabs are disposed on the single battery cell in the battery pack, and the tabs are located at the same end or two opposite ends of the battery cell.
Preferably, the series-parallel connection of the unit cells includes series connection and parallel connection of battery packs.
Preferably, in the step (2), the number of the monomer cells is 2-999.
Has the advantages that: according to the invention, the output voltage and capacity of the battery can be designed through series-parallel connection of the small internal battery cores as required, and the battery voltage is not limited by the single voltage of the traditional battery core.
The invention can prepare flexible batteries with any shape and capacity, so that the capacity of the flexible battery is not limited by the size.
Preferably, the winding core comprises a positive pole piece, a diaphragm and a negative pole piece which are wound in sequence, wherein a positive active material is coated on one side or two sides of the positive pole piece, a negative active material is coated on one side or two sides of the negative pole piece, and when the positive active material is coated on one side of the positive pole piece, one side coated with the positive active material faces the diaphragm; when one side of the negative electrode tab is coated with the negative active material, the side coated with the negative active material is disposed toward the separator.
Preferably, the laminated core comprises a positive pole piece, a diaphragm and a negative pole piece which are sequentially laminated, wherein one side or two sides of the positive pole piece are coated with a positive active material, one side or two sides of the negative pole piece are coated with a negative active material, and when one side of the positive pole piece is coated with the positive active material, the side coated with the positive active material is arranged towards the diaphragm; when one side of the negative electrode tab is coated with the negative active material, the side coated with the negative active material is disposed toward the separator.
The laminated core or the coiled core can be a single secondary battery core, such as a lithium battery core, a nickel-hydrogen battery core and a nickel-cadmium battery core, and can also be a primary battery core, such as a zinc-manganese dry battery core.
Preferably, the positive active material includes one or more of lithium iron phosphate, lithium cobaltate, lithium manganate, nickel cobalt manganese ternary positive electrode material, nickel cobalt aluminum ternary positive electrode material, and lithium-rich layered positive electrode material.
Preferably, the negative active material comprises one or more of artificial graphite, natural graphite, mesocarbon microbeads, a carbon-silicon negative electrode and lithium titanate.
Preferably, the electrolyte includes one or more of Ethylene Carbonate (EC), Propylene Carbonate (PC), Vinylene Carbonate (VC), dimethyl carbonate (DMC), diethyl carbonate (DEC), Methyl Formate (MF), Ethyl Acetate (EA), Tetrahydrofuran (THF), Acetonitrile (AN).
Preferably, the lithium salt in the electrolyte comprises lithium hexafluorophosphate (LiPF) 6 ) Lithium bis (trifluoromethylsulfonyl) imide (LiTFSI), lithium bis (fluorosulfonyl) imide (LiFSI), lithium perchlorate (LiClO) 4 ) Lithium hexafluoroarsenate (LiAsF) 6 ) Lithium bis (oxalato) borate (LiBOB), lithium bis (perfluoroethylsulfonyl) imide (LiBETI) and lithium trifluoromethanesulfonate (LiCF) 3 SO 3 ) One or more of (a).
The invention also provides a flexible battery pack prepared by the preparation method.
Has the advantages that: the capacity of the flexible battery pack prepared by the invention is not limited by size.
The invention has the advantages that:
according to the preparation method, when the distance between the adjacent single battery cells is larger than 0, the adjacent single battery cells are arranged at intervals, gaps are reserved between the adjacent single battery cells, the packaging material is filled in the gaps and covers the battery pack, and the prepared flexible battery pack can relieve stress generated during bending due to the buffering effect of the packaging material between the batteries, so that the performance of the battery is protected from attenuation after being bent for many times.
When the distance between the adjacent monomer battery cores is 0-10mm, the flexible battery pack with any shape and capacity can be prepared by adopting the preparation method disclosed by the invention, so that the capacity of the flexible battery pack is not limited by the size.
The output voltage and the capacity of the battery are set through the internal winding core or the core stacking series-parallel connection, and the voltage of the battery is not limited by the voltage of a single traditional electric core.
The preparation method is simple to operate and can be directly finished outdoors from the first packaging.
According to the invention, the single battery cell is packaged on the flexible carrier, and the flexible carrier is formed independently, so that the safety problem of the battery pack caused by uneven battery distribution and exposure of the battery outside the packaging material due to the weight of the battery when the flexible material and the battery pack are integrally formed is solved.
By adopting the preparation method, the process needing series operation can be carried out by adopting a parallel method, thereby improving the production efficiency and reducing the preparation cost of the product to a great extent.
The invention adopts the flexible carrier for packaging, does not need a thicker packaging layer and improves the energy density of the battery.
According to the invention, the positive and negative electrodes of the battery are tightly packaged by using the heat-conducting and insulating non-flammable material, so that the short circuit of the positive and negative electrodes of the single battery cells connected in series or in parallel can be effectively prevented when the single battery cells are bent, and the safety of the flexible battery pack is greatly improved.
According to the invention, the output voltage and capacity of the battery can be designed through series-parallel connection of the small internal battery cores as required, and the battery voltage is not limited by the single voltage of the traditional battery core.
The invention can prepare flexible batteries with any shape and capacity, so that the capacity of the flexible battery is not limited by the size.
Drawings
Fig. 1 is a schematic structural diagram of a flexible battery pack before packaging is completed in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a flexible battery pack after packaging is completed in the embodiment of the present invention.
Fig. 3 is a graph showing the results of a bending test measurement performed on the flexible battery pack manufactured in example 1.
In the figure: a single battery cell 1; a flexible cover plate 2; a flexible carrier 3; a positive electrode tab 4; a negative electrode tab 5; a positive electrode 6; and a negative electrode 7.
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.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
Preparation method of flexible battery pack
(1) Preparing a monomer battery cell 1: in an argon-protected glove box, lithium cobaltate is used as a positive electrode active material, a coating machine is adopted to coat on an aluminum foil to prepare a positive electrode sheet, artificial graphite is used as a negative electrode active material, the coating machine is adopted to coat on the copper foil to prepare a negative electrode sheet, the positive electrode sheet, a diaphragm and the negative electrode sheet are prepared into a roll core through a winding process, when the roll core is formed, the positive electrode sheet, the diaphragm and the negative electrode sheet are sequentially stacked and then wound, the positive electrode sheet is arranged on the inner layer, the diaphragm is arranged between the positive electrode and the negative electrode, the negative electrode sheet is arranged on the outer layer, and then the roll core is packaged for the first time through an aluminum-plastic film;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF) 6 ) Then carrying out secondary packaging on the winding core, aging and forming, and carrying out tertiary packaging on the winding core after forming to obtain 8 monomer battery cores 1 with the capacity of 65mAh, wherein the size 3 x 14 x 30 (thickness, width, length, unit mm) of each monomer battery core 1; wherein the electrolyte is Ethylene Carbonate (EC) and dimethyl carbonate (DMC), the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1, and the formation and packaging methods are the prior art;
(2) preparing a battery pack: connecting the 8 monomer electric cores 1 prepared in the step (1) in parallel to form a battery pack, wherein a positive electrode lug and a negative electrode lug of the battery are respectively arranged at the end parts of the monomer electric cores 1, the 8 monomer electric cores 1 are connected in parallel through a wire (not shown), the distance between every two adjacent monomer electric cores 1 is 1mm, the positive electrode lugs 2 of the adjacent monomer electric cores 1 are connected through a wire, and the negative electrode lugs 3 of the adjacent monomer electric cores 1 are connected through a wire; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) preparing a mould: weighing 12g of epoxy resin A glue (main agent) and 10g of epoxy resin B glue (hardening agent), mixing, adding 0.1g of blue coloring agent to prepare a precursor material, pouring the precursor material into a mold to prepare a flexible carrier 3 and a flexible cover plate 2, wherein the preparation method of the precursor material in the embodiment is the prior art, as shown in fig. 1 and 2, the flexible carrier 3 is cuboid, the top wall of the flexible carrier 3 is provided with a groove for accommodating a battery pack, the flexible cover plate 2 is cuboid, the flexible cover plate 2 is matched with the groove, and the size of the flexible carrier is set according to the size of a single battery core 1; in the embodiment, the precursor materials are epoxy resin A glue and epoxy resin B glue, the epoxy resin A glue and the epoxy resin B glue are in the prior art, and the epoxy resin A glue and the epoxy resin B glue are mixed and then are subjected to polymerization reaction and solidification at normal temperature; epoxy resin a glue and epoxy resin B glue (JH-301) in this example were purchased from polymer macro new material science and technology limited, guan, inc; other flexible materials in the prior art can also be used as the precursor material in the present embodiment.
(4) Packaging of the flexible battery pack: weighing 5g of silica gel A glue and 5g of silica gel B glue, and mixing to obtain a packaging material; the silica gel A glue and the silica gel B glue (JH-908) in the embodiment are purchased from a polymer macro new material science and technology limited company in Dongguan;
and (3) placing the battery pack prepared in the step (2) in a groove of a flexible carrier 3, injecting a packaging material into the groove, covering a flexible cover plate 2 on the groove, contacting the packaging material in the groove to complete the packaging of the battery, and forming a cuboid by the flexible cover plate 2 and the flexible carrier 3 to prepare the complete flexible battery pack. For convenience of use, the battery positive electrode 6 and the battery negative electrode 7 are mounted on the outer side of the battery in this embodiment, and are connected by a lead (not shown), respectively. And (3) standing the packaged battery at 50 ℃ for 2h, and taking out to test the electrochemical performance of the flexible battery pack.
The flexible battery pack in this example was subjected to electrochemical performance testing, and the voltage, internal resistance, and capacity of the battery were measured by measuring the internal resistance and voltage of the battery using a BK-600A battery internal resistance tester from cantonese electronics ltd. The capacity is tested by a high-precision battery performance testing system CT-4008-5V6A-S1 device of New Wille electronic company in Shenzhen.
And (3) measuring results: the battery obtained in this example had a voltage of 4.20V, an internal resistance of 76.4m Ω, and a capacity of 510.69 mAh.
Example 2
Preparation method of flexible battery pack
(1) Preparing a monomer battery cell 1: the procedure was the same as in example 1;
(2) preparing a battery pack: connecting the 8 monomer electric cores 1 prepared in the step (1) in parallel to form a battery pack, wherein a positive electrode lug and a negative electrode lug of the battery are respectively arranged at the end parts of the monomer electric cores 1, the 8 monomer electric cores 1 are connected in parallel through a wire (not shown), the distance between every two adjacent monomer electric cores 1 is 0mm, the positive electrode lugs 2 of the adjacent monomer electric cores 1 are connected through a wire, and the negative electrode lugs 3 of the adjacent monomer electric cores 1 are connected through a wire; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) preparing a mould: weighing 100g of black silica gel, vulcanizing and molding at 180 degrees to prepare a flexible carrier 3 and a flexible cover plate 2, wherein the preparation method of the precursor material in the embodiment is the prior art, as shown in fig. 1 and 2, the flexible carrier 3 is rectangular, a groove for accommodating a battery pack is formed in the top wall of the flexible carrier 3, the flexible cover plate 2 is rectangular, the flexible cover plate 2 is matched with the groove, and the size of the flexible carrier is set according to the size of a single battery core 1; in the embodiment, the precursor material is silica gel, the silica gel is the prior art, and the material is vulcanized, fixed and molded at high temperature; the silica gel in the embodiment is purchased from Shenzhen Shiwo science and technology Limited; other flexible materials in the prior art can also be used as the precursor material in the present embodiment.
(4) Packaging of the flexible battery pack: weighing 5g of silica gel A glue and 5g of silica gel B glue, and mixing to obtain a packaging material; the silica gel A glue and the silica gel B glue (JH-908) in the embodiment are purchased from the New Material science and technology company, Macro, Inc., of Dongguan;
and (3) placing the battery pack prepared in the step (2) in a groove of a flexible carrier 3, injecting a packaging material into the groove, covering a flexible cover plate 2 on the groove, contacting the packaging material in the groove to complete the packaging of the battery, and forming a cuboid by the flexible cover plate 2 and the flexible carrier 3 to prepare the complete flexible battery pack. For convenience of use, the battery positive electrode 6 and the battery negative electrode 7 are mounted on the outer side of the battery in this embodiment, and are connected by a lead (not shown), respectively. And (3) standing the packaged battery at 50 ℃ for 2h, and taking out to test the electrochemical performance of the flexible battery pack.
The flexible battery pack in this example was subjected to electrochemical performance testing, and the voltage, internal resistance, and capacity of the battery were measured by measuring the internal resistance and voltage of the battery using a BK-600A battery internal resistance tester from cantonese electronics ltd. The capacity is tested by a high-precision battery performance testing system CT-4008-5V6A-S1 device of New Wille electronic company in Shenzhen.
And (3) measuring results: the battery obtained in this example had a voltage of 4.20V, an internal resistance of 76.4m Ω, and a capacity of 510.69 mAh.
Example 3
Preparation method of flexible battery pack
(1) Preparing a monomer battery cell 1: the procedure was the same as in example 1;
(2) preparing a battery pack: connecting the 8 monomer battery cores 1 prepared in the step (1) in series to form a battery pack, wherein a positive electrode tab and a negative electrode tab of the battery are respectively installed at the end parts of the monomer battery cores 1, the 8 monomer battery cores 1 are connected in series through a wire (not shown in the figure), the distance between the adjacent monomer battery cores 1 is 1mm, and the positive electrode tab 2 and the negative electrode tab 3 of the adjacent monomer battery cores 1 are connected through a wire (not shown in the figure); in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) preparing a mould: weighing 20g of soft polyvinyl chloride (PVC) and 0.1g of black coloring agent to prepare a precursor material, and pouring the precursor material into a mold to prepare a flexible carrier 3 and a flexible cover plate 2, wherein the preparation method of the precursor material in the embodiment is the prior art, as shown in fig. 1 and 2, the flexible carrier 3 is cuboid, a groove for accommodating a battery pack is formed in the top wall of the flexible carrier 3, the flexible cover plate 2 is cuboid, the flexible cover plate 2 is matched with the groove, and the size of the flexible carrier is set according to the size of the single battery core 1; the precursor material in this example is soft polyvinyl chloride, which is purchased from suzhou renpeng plastication ltd; other flexible materials in the prior art can also be used as the precursor material in the present embodiment.
(4) Packaging of the flexible battery pack: weighing 5g of silica gel A glue and 5g of silica gel B glue, and mixing to obtain a packaging material; the silica gel A glue and the silica gel B glue (JH-908) in the embodiment are purchased from the New Material science and technology company, Macro, Inc., of Dongguan;
and (3) placing the battery pack prepared in the step (2) in a groove of a flexible carrier 3, injecting a packaging material into the groove, covering a flexible cover plate 2 on the groove, contacting the packaging material in the groove to complete the packaging of the battery, and forming a cuboid by the flexible cover plate 2 and the flexible carrier 3 to prepare the complete flexible battery pack. For convenience of use, the positive electrode 6 and the negative electrode 7 of the battery are mounted on the outer side of the battery in this embodiment and are connected by leads (not shown), respectively. And (3) standing the packaged battery at 50 ℃ for 2h, and taking out to test the electrochemical performance of the flexible battery pack.
The flexible battery pack in this example was subjected to electrochemical performance testing, and the voltage, internal resistance, and capacity of the battery were measured by measuring the internal resistance and voltage of the battery using a BK-600A battery internal resistance tester from cantonese electronics ltd. The capacity is tested by a high-precision battery performance testing system CT-4008-5V6A-S1 device of New Wille electronic company in Shenzhen.
And (3) measuring results: the battery prepared in this example had a voltage of 33.60V, an internal resistance of 639.3m Ω, and a capacity of 68.29 mAh.
Example 4
Preparation method of flexible battery pack
(1) Preparing a monomer battery cell 1: the procedure was the same as in example 1;
(2) preparing a battery pack: connecting the 8 monomer electric cores 1 prepared in the step (1) in parallel from a first monomer electric core to a fourth monomer electric core from the left side, connecting the fifth monomer electric core to an eighth monomer electric core in parallel, then connecting the two battery packs in series to form a battery pack, respectively installing a positive electrode lug and a negative electrode lug of the battery at the end parts of the monomer electric cores 1, connecting the 8 monomer electric cores 1 in series and parallel through a wire (not shown), wherein the distance between the adjacent monomer electric cores 1 is 1mm, and connecting the positive electrode lug 2 and the negative electrode lug 3 of the monomer electric cores 1 through a wire; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) preparing a mould: weighing 20g of thermoplastic elastomer (TPE) and 0.1g of black colorant to obtain a precursor material, and pouring the precursor material into a mold to prepare a flexible carrier 3 and a flexible cover plate 2, wherein the preparation method of the precursor material in the embodiment is the prior art, as shown in fig. 1 and 2, the flexible carrier 3 is cuboid, a groove for accommodating a battery pack is formed in the top wall of the flexible carrier 3, the flexible cover plate 2 is cuboid, the flexible cover plate 2 is matched with the groove, and the size of the flexible carrier is set according to the size of the single battery core 1; the precursor material in this embodiment is a plastic elastomer, and the plastic elastomer in this embodiment is purchased from plastic polymer technology ltd available in Dongguan; other flexible materials in the prior art can also be used as the precursor material in the present embodiment.
(4) Packaging of the flexible battery pack: weighing 5g of silica gel A glue and 5g of silica gel B glue, and mixing to obtain a packaging material; the silica gel A glue and the silica gel B glue (JH-908) in the embodiment are purchased from the New Material science and technology company, Macro, Inc., of Dongguan;
and (3) placing the battery pack prepared in the step (2) in a groove of a flexible carrier 3, injecting a packaging material into the groove, covering a flexible cover plate 2 on the groove, contacting the packaging material in the groove to complete the packaging of the battery, and forming a cuboid by the flexible cover plate 2 and the flexible carrier 3 to prepare the complete flexible battery pack. For convenience of use, the battery positive electrode 6 and the battery negative electrode 7 are mounted on the outer side of the battery in this embodiment, and are connected by a lead (not shown), respectively. And (3) standing the packaged battery at 50 ℃ for 2h, and taking out to test the electrochemical performance of the flexible battery pack.
The flexible battery pack in this example was subjected to electrochemical performance testing, and the voltage, internal resistance, and capacity of the battery were measured by measuring the internal resistance and voltage of the battery using a BK-600A battery internal resistance tester from cantonese electronics ltd. The capacity is tested by a high-precision battery performance testing system CT-4008-5V6A-S1 device of New Wille electronic company in Shenzhen.
And (3) measuring results: the battery obtained in this example had a voltage of 8.40V, an internal resistance of 159.6m Ω, and a capacity of 251.61 mAh.
Example 5
Preparation method of flexible battery pack
(1) Preparing a monomer battery cell 1: the procedure was the same as in example 1;
(2) preparing a battery pack: connecting the 8 monomer electric cores 1 prepared in the step (1) in parallel to form a battery pack, wherein a positive electrode lug and a negative electrode lug of the battery are respectively arranged at the end parts of the monomer electric cores 1, the 8 monomer electric cores 1 are connected in parallel through a wire (not shown), the distance between every two adjacent monomer electric cores 1 is 1mm, the positive electrode lugs 2 of the adjacent monomer electric cores 1 are connected through a wire, and the negative electrode lugs 3 of the adjacent monomer electric cores 1 are connected through a wire; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) preparing a mould: weighing 20g of thermoplastic elastomer (TPE) and 0.1g of black colorant to obtain a precursor material, and pouring the precursor material into a mold to prepare a flexible carrier 3 and a flexible cover plate 2, wherein the preparation method of the precursor material in the embodiment is the prior art, as shown in fig. 1 and 2, the flexible carrier 3 is cuboid, a groove for accommodating a battery pack is formed in the top wall of the flexible carrier 3, the flexible cover plate 2 is cuboid, the flexible cover plate 2 is matched with the groove, and the size of the flexible carrier is set according to the size of the single battery core 1; the precursor material in this embodiment is TPE, and the TPE in this embodiment is purchased from plastic polymer technology limited, guan city; other flexible materials in the prior art can also be used as the precursor material in the present embodiment.
(4) Packaging of the flexible battery pack: weighing 5g of silica gel A glue and 5g of silica gel B glue, and mixing to obtain a packaging material; the silica gel A glue and the silica gel B glue (JH-908) in the embodiment are purchased from the New Material science and technology company, Macro, Inc., of Dongguan;
and (3) placing the battery pack prepared in the step (2) in a groove of a flexible carrier 3, injecting a packaging material into the groove, covering the flexible cover plate 2 on the groove to complete the packaging of the battery, and forming a complete cuboid by the flexible cover plate 2 and the flexible carrier 3 to prepare the complete flexible battery pack. For convenience of use, the battery positive electrode 6 and the battery negative electrode 7 are mounted on the outer side of the battery in this embodiment, and are connected by a lead (not shown), respectively. And (3) standing the packaged battery at 50 ℃ for 2h, and taking out to test the electrochemical performance of the flexible battery pack.
The flexible battery pack in this example was subjected to electrochemical performance testing, and the voltage, internal resistance, and capacity of the battery were measured by measuring the internal resistance and voltage of the battery using a BK-600A battery internal resistance tester from cantonese electronics ltd. The capacity is tested by a high-precision battery performance testing system CT-4008-5V6A-S1 device of New Wille electronic company in Shenzhen.
And (3) measuring results: the battery obtained in this example had a voltage of 4.20V, an internal resistance of 64.7m Ω, and a capacity of 502.62 mAh.
Example 6
This embodiment is different from embodiment 1 in that: the flexible carrier is dumbbell-shaped, and the shape of flexible apron sets up according to the shape of flexible carrier.
A bending test experiment was performed on the flexible battery pack prepared in example 1.
Wherein 5000 times of bending and 50 times of folding at 180 degrees. The capacity was measured during the course of the experiment at 505, 2020, 5050 bends, respectively. During measurement, the voltage of the battery is charged to 4.20, and then the capacity is measured by using a battery performance testing system of Shenzhen New Wille electronic Limited.
The bending test method comprises the following steps: firstly, bending the right half part of the battery by 60 degrees in the anticlockwise direction, and simultaneously bending the left half part of the battery by 60 degrees in the clockwise direction; secondly, bending the right half part of the battery by 60 degrees along the anticlockwise direction, and simultaneously bending the left half part of the battery by 60 degrees along the anticlockwise direction; and thirdly, repeating the bending test method, and performing 180-degree folding test after every 100 bending tests. This was repeated for 5000 bending tests, and 50 double-fold tests. A total of 5050 tests were performed.
And (3) testing results: as shown in fig. 3, fig. 3 is a graph of the cell cycle performance test results after bending 5050 of a flexible cell sample.
Table 1 shows the results of the bending test of the flexible battery pack
As can be seen from table 1 and fig. 3, after 5050 bending folding tests of 5 battery samples obtained by analyzing bending test data, the capacity of 5 groups of batteries is maintained at 99% or more, and the average capacity retention rate is 100% or more. In addition, after the cycle performance test is carried out on the battery bent 5050 times, the battery has good cycle performance. The capacity of the battery after 300 cycles is maintained above 90%. Through these two tests, it was demonstrated that the battery had good bending properties. The performance of the flexible batteries manufactured in other examples was substantially the same as that of example 1.
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. A method for preparing a flexible battery pack, comprising: the method comprises the following steps:
(1) packaging the coiled core or the stacked core for the first time by adopting an aluminum plastic film, injecting electrolyte, and packaging for the second time after formation to obtain a monomer battery core;
(2) preparing a battery pack: connecting the monomer battery cells prepared in the step (1) in parallel, in series or in series-parallel to form a battery pack, wherein the distance between adjacent monomer battery cells is 1-10 mm;
(3) packaging of the flexible battery pack: putting the battery pack obtained in the step (2) into a mold, then injecting a packaging material, and polymerizing the packaging material at normal temperature to obtain a flexible battery pack, wherein the mold comprises a flexible carrier and a flexible cover plate, the flexible carrier is provided with a groove for accommodating the battery pack, and the flexible cover plate covers the groove; the packaging material comprises silica gel, silicone grease, polydimethylsiloxane or epoxy resin.
2. The method of manufacturing a flexible battery according to claim 1, characterized in that: the flexible carrier and the flexible cover plate are both made of precursor materials, and the precursor materials comprise plastics, rubber, silicone grease or silica gel.
3. The method of manufacturing a flexible battery according to claim 2, characterized in that: the precursor material also comprises an additive, wherein the additive is a coloring agent, an antistatic agent, an antioxidant, a flame retardant or a lubricant, and the addition amount of the additive is 0-30% of the total amount of the precursor material.
4. The method of manufacturing a flexible battery according to claim 1, characterized in that: the packaging material also comprises an additive, wherein the additive is a colorant, a flame retardant or a lubricant, and the additive amount of the additive is 0-30% of the total amount of the packaging material.
5. The method of manufacturing a flexible battery according to claim 1, characterized in that: the flexible carrier is in a cuboid shape or a dumbbell shape.
6. The method of manufacturing a flexible battery according to claim 1, characterized in that: the number of the monomer battery cores in the step (2) is 2-999.
7. The method of manufacturing a flexible battery according to claim 1, characterized in that: the battery pack is characterized in that a single battery cell is provided with a positive pole lug and a negative pole lug, and the positive pole lug and the negative pole lug are both positioned at the same end or two opposite ends of the battery cell.
8. The method of manufacturing a flexible battery according to claim 1, characterized in that: the series-parallel connection of the single battery cells comprises series connection and parallel connection of battery packs.
9. A flexible battery manufactured by the manufacturing method of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2020105486971 | 2020-06-16 | ||
| CN202010548697.1A CN111653817A (en) | 2020-06-16 | 2020-06-16 | Preparation method of flexible battery pack and prepared flexible battery pack |
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| CN112002933A CN112002933A (en) | 2020-11-27 |
| CN112002933B true CN112002933B (en) | 2022-08-09 |
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| CN202010960095.7A Active CN112002931B (en) | 2020-06-16 | 2020-09-14 | Preparation method of flexible battery pack and prepared flexible battery pack |
| CN202011039358.7A Active CN112002933B (en) | 2020-06-16 | 2020-09-28 | Preparation method of flexible battery pack and prepared flexible battery pack |
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| CN202010960095.7A Active CN112002931B (en) | 2020-06-16 | 2020-09-14 | Preparation method of flexible battery pack and prepared flexible battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111653817A (en) * | 2020-06-16 | 2020-09-11 | 深圳信达新能源科技有限公司 | Preparation method of flexible battery pack and prepared flexible battery pack |
| CN112909404A (en) * | 2021-02-05 | 2021-06-04 | 盐城师范学院 | Flexible battery and preparation method thereof |
| CN113437348B (en) * | 2021-07-01 | 2022-11-04 | 上海大学 | Bidirectional bendable flexible battery and manufacturing method thereof |
| CN116210107A (en) * | 2021-07-22 | 2023-06-02 | 京东方科技集团股份有限公司 | Flexible battery and electronic device |
| CN113809453B (en) * | 2021-09-09 | 2023-11-14 | 嘉兴极展科技有限公司 | Manufacturing method of flexible stretchable battery pack |
| CN114256500B (en) * | 2021-12-01 | 2024-03-15 | 中国电子科技南湖研究院 | Strip-shaped flexible solid-state battery capable of being cut |
| CN114300796A (en) * | 2021-12-30 | 2022-04-08 | 三一技术装备有限公司 | Battery with a battery cell |
| CN115275308B (en) * | 2022-08-11 | 2023-03-14 | 扬州大学 | Integrated forming device of flexible surface type solid-state battery and working method thereof |
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Also Published As
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| CN112002933A (en) | 2020-11-27 |
| CN112002931A (en) | 2020-11-27 |
| WO2021253994A1 (en) | 2021-12-23 |
| CN112002931B (en) | 2022-03-18 |
| CN111653817A (en) | 2020-09-11 |
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