CN112002931A - 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 PDF

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Publication number
CN112002931A
CN112002931A CN202010960095.7A CN202010960095A CN112002931A CN 112002931 A CN112002931 A CN 112002931A CN 202010960095 A CN202010960095 A CN 202010960095A CN 112002931 A CN112002931 A CN 112002931A
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Prior art keywords
battery
battery pack
flexible
flexible battery
manufacturing
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Granted
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CN202010960095.7A
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Chinese (zh)
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CN112002931B (en
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廖栋梁
毛彦勇
李开帝
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Shenzhen Yixin New Energy Technology Co.,Ltd.
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Shenzhen Xinda New Energy Technology Co ltd
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Priority to PCT/CN2021/090425 priority Critical patent/WO2021253994A1/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention discloses a preparation method of a flexible battery, which relates to the technical field of lithium batteries and 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; (2) preparing a battery pack: arranging the monomer battery cores injected with the electrolyte in series, parallel or series-parallel connection, wherein the number of the monomer battery cores is more than 2, and adjacent monomer battery cores are arranged at intervals; (3) and (3) putting the battery pack obtained in the step (2) into a mould, then injecting a precursor of the packaging agent, and polymerizing the precursor at normal temperature to obtain the flexible battery pack. The invention provides a flexible battery pack prepared by the preparation method. The invention has the beneficial effects that: according to the preparation method, the adjacent monomer battery cells are arranged at intervals, and the sealant is filled in the gaps between the adjacent monomer battery cells, so that the stress generated when the battery is repeatedly bent and folded can be effectively released, and the performance of the flexible battery pack is protected from being attenuated after the flexible battery pack is bent.

Description

Preparation method of flexible battery pack and prepared flexible battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to a preparation method of a flexible battery pack and the prepared flexible battery pack.
Background
With the development of society, electronic components play an increasingly important role in human life, and portable electronic components bring great convenience to people's life. With the development of portable electronic components, such as portable smart watches, electronic tags, exercise components, medical health devices and the like, the appearance of energy storage devices with flexibility and flexibility is more and more urgent.
Lithium batteries on the market today are typically packaged in four packaging ways: cylinder, square, button and soft package. The cylindrical, square and button cell batteries have no flexibility, and the soft package battery has certain flexibility under specific conditions (the soft package battery with the thickness less than 2mm has certain flexibility). The patent with publication number CN102544574A discloses a flexible lithium ion battery and a packaging method thereof, the flexible lithium ion battery includes a flexible casing and a battery main body located inside the flexible casing, and the flexible casing is made of flexible plastic prepared by high-temperature injection molding.
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 can be damaged after the battery is bent for multiple times, so that the safety problem caused by the contact short circuit of the positive electrode and the negative electrode is caused.
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:
the invention provides a preparation method of a flexible battery pack, which 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: arranging the monomer battery cores injected with the electrolyte in series, parallel or series-parallel connection, wherein the number of the monomer battery cores is more than 2, and adjacent monomer battery cores are arranged at intervals;
(3) and (3) putting the battery pack obtained in the step (2) into a mould, then injecting a precursor of the packaging agent, and polymerizing the precursor at normal temperature to obtain the flexible battery pack.
Has the advantages that: according to the preparation method provided by the invention, because the adjacent monomer battery cells are arranged at intervals, a gap is formed between the adjacent monomer battery cells, the packaging agent is filled in the gap and covers the battery pack, and the prepared flexible battery pack has the buffer effect of the packaging agent, the stress generated during bending can be relieved, 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.
Preferably, the number of the single battery cells is 2-99.
Preferably, the gap between adjacent individual cells is 0-10 mm.
Preferably, the encapsulant comprises one or more of silicone, silicone grease, or epoxy.
Has the advantages that: after the battery is processed at the temperature of over 100 ℃, the performance of the battery can be quickly attenuated and then loses efficacy, the battery can be packaged at normal temperature by adopting the packaging agent, and the battery performance can be prevented from losing efficacy due to quick attenuation under the condition that the performance of the battery is not influenced. The material is insulating and non-conducting, has good waterproofness and good heat dissipation performance, and the solid flexible material formed after polymerization has low thermal expansion rate and normal temperature of 10 DEG-12The dielectric ceramic has the advantages of high compressive strength, high tensile strength and high dielectric constant and voltage resistance.
Preferably, the encapsulant further comprises an additive which is a colorant, an antistatic agent, an antioxidant, a flame retardant or a lubricant.
Preferably, the colorant is added in an amount of 0 to 10% of the total amount of the encapsulant.
Preferably, the mold has a circular ring shape, a square shape, or a rectangular parallelepiped shape.
Has the advantages that: when the mold is in a circular ring shape, the mold can be applied to electronic products such as a bracelet and a watch.
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, 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.
Has the advantages that:
the positive and negative electrode materials of the existing flexible battery are easy to fall off from a current collector after being bent for multiple times and pierce a diaphragm, and the diaphragm is damaged after being bent for multiple times, so that the battery is short-circuited, and the safety problem is caused; the flexible battery prepared by the preparation method has good flexibility, and the performance of the battery is not attenuated after a large number of bending and folding.
Preferably, the positive active material comprises one or more of lithium iron phosphate, lithium cobaltate, lithium manganate, nickel cobalt manganese ternary positive electrode material and nickel cobalt aluminum ternary positive electrode material.
Preferably, the negative active material comprises one or more of artificial graphite, natural graphite, carbon silicon negative electrode, 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)3SO3) One or more of (a).
Preferably, the single battery cell is provided with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are located at the same end of the single battery cell, or the positive electrode tab and the negative electrode tab are respectively located at two ends of the battery cell.
Preferably, the positive electrode tabs of the adjacent monomer battery cells are connected through a wire, and the negative electrode tabs of the adjacent monomer battery cells are connected through a wire.
Preferably, the mold injected with the precursor of the encapsulant in step (3) is placed in a vacuum environment for 0-180 min.
The technical problem to be solved by the invention is to provide a flexible battery pack prepared by the preparation method.
Has the advantages that: the performance of the flexible battery pack is not attenuated after repeated bending and folding, and the flexible battery pack can be folded and bent (180 degrees), and meanwhile, the capacity of the flexible battery pack is not limited by the size.
The invention has the advantages that: 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 positive and negative electrode materials of the conventional flexible battery are easy to fall off from a current collector after being bent for multiple times and pierce a diaphragm, the diaphragm of the lithium battery is a porous organic matter, and the diaphragm is damaged after the battery is bent for multiple times and is likely to cause short circuit of the battery, so that the safety problem is caused.
According to the flexible battery pack, the adjacent monomer battery cells are arranged at intervals, gaps are reserved between the adjacent monomer battery cells, the packaging agent is filled in the gaps, and the packaging agent among the monomer battery cells can relieve stress formed in the bending and folding process, so that the performance of the flexible battery is not attenuated after the flexible battery is bent.
Drawings
Fig. 1 is a schematic view showing the mounting of a battery pack in embodiment 1 of the invention;
fig. 2 is a schematic view showing the mounting of a battery pack in embodiment 2 of the invention;
fig. 3 is a schematic view showing the mounting of a battery pack in embodiment 3 of the invention;
fig. 4 is a schematic view showing the mounting of a battery pack in embodiment 4 of the invention;
fig. 5 is a schematic view showing the mounting of a battery pack in embodiment 5 of the invention;
fig. 6 is a schematic view showing the mounting of a battery pack in embodiment 6 of the invention;
FIG. 7 is a graph showing the performance of 100 charge-discharge cycles in example 1 of the present invention;
fig. 8 is a graph showing the charge-discharge cycle performance of the battery of example 1 after bending for 100 times;
in the figure: a single battery cell 1; a positive electrode tab 2; a negative electrode tab 3; a wire 4; an encapsulant 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
A method of making a flexible battery comprising the steps of:
(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;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF)6) Then packaging the roll core for the second time, aging, forming, and packaging the roll core for the third time to obtain the electrolyte with a capacity of 125mAh, size 3 x 14 x 36 (thickness, width, length, unit mm) of individual cell 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: as shown in fig. 1, a positive electrode tab 2 and a negative electrode tab 3 of a battery are respectively installed at two ends of a single battery cell 1, four single battery cells 1 are connected in parallel, a gap between adjacent single battery cells 1 is 2mm, the positive electrode tabs 2 of the adjacent single battery cells 1 are connected through a lead 4, and the negative electrode tabs 3 of the adjacent single battery cells 1 are connected through a lead 4; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 10g of silica gel A glue and 10g of silica gel B glue, and mixing to prepare a precursor of the encapsulant 5; in the embodiment, the precursors of the encapsulant 5 are silica gel A and silica gel B, the silica gel A and the silica gel B are in the prior art, and the silica gel A and the silica gel B are mixed and then polymerized and cured at normal temperature; 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;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, setting the specific shape of the mold according to actual needs, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in a vacuum environment for 30min, taking out after 30min, standing for 5h, and completing battery packaging, namely preparing the flexible battery pack in the embodiment. For convenience of use, a battery anode 6 and a battery cathode 7 are arranged on the outer side of the battery in the embodiment and are respectively connected through leads.
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 4.20V, an internal resistance of 66.47m Ω, and a capacity of 503.23 mAh.
Example 2
A method of making a flexible battery comprising the steps of:
(1) in an argon-protected glove box, lithium iron phosphate is used as a positive electrode active material, a sprayer is used for spraying on an aluminum foil to prepare a positive plate, natural graphite is used as a negative electrode active material, a sprayer is used for spraying on a copper foil to prepare a negative plate, the positive plate, a diaphragm and the negative plate are used for preparing a winding core through a winding process, when the winding is formed, the positive plate, the diaphragm and the negative plate are sequentially stacked and then wound, the positive plate is arranged on the inner layer, the diaphragm is arranged between the positive electrode and the negative electrode, the negative plate is arranged on the outer layer, and then an aluminum plastic film is used for carrying out primary packaging on the winding;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF)6) The winding core is packaged for the second time, aging and formation are carried out on the winding core, the winding core is packaged for the third time after formation, a monomer battery core 1 with the capacity of 125mAh is obtained, and the size 4 x 14 x 38 (thickness, width, length, unit mm) of the monomer battery core 1 is obtained; 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: as shown in fig. 2, a positive electrode tab 2 and a negative electrode tab 3 of a battery are respectively installed at two ends of a single battery cell 1, four single battery cells 1 are connected in series, a gap between adjacent single battery cells 1 is 0mm, and the positive electrode tab 2 and the negative electrode tab 3 of the adjacent single battery cells 1 are connected through a wire 4; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 10g of silica gel A glue and 10g of silica gel B glue, and mixing to prepare a precursor of the encapsulant 5; in the embodiment, the precursors of the encapsulant 5 are silica gel A and silica gel B, the silica gel A and the silica gel B are in the prior art, and the silica gel A and the silica gel B are mixed and then polymerized and cured at normal temperature; 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;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, setting the specific shape of the mold according to actual needs, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in a vacuum environment for 30min, taking out after 30min, standing for 5h, and completing battery packaging, namely preparing the flexible battery pack in the embodiment. For convenience of use, any one of the positive electrode tabs 2 and any one of the negative electrode tabs 3 of the battery are exposed to the outside of the encapsulant 5 in this embodiment.
The flexible battery in this example was subjected to electrochemical performance tests, and the voltage, internal resistance, and capacity of the battery were measured in the same manner as in example 1.
And (3) measuring results: the battery obtained in this example had a voltage of 14.8V, an internal resistance of 608.82m Ω, and a capacity of 128.61 mAh.
Example 3
A method of making a flexible battery comprising the steps of:
(1) in an argon-protected glove box, taking a ternary material NCM523 as a positive electrode active material, coating a coating machine on an aluminum foil to prepare a positive electrode sheet, taking artificial graphite as a negative electrode active material, coating a coating machine on a copper foil to prepare a negative electrode sheet, and preparing a winding core from the positive electrode sheet, a diaphragm and the negative electrode sheet by a winding process, wherein during winding forming, the positive electrode sheet, the diaphragm and the negative electrode sheet are sequentially laminated 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 winding core is packaged for the first time by an aluminum;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF)6) The winding core is packaged for the second time, aging and formation are carried out on the winding core, the winding core is packaged for the third time after formation, a monomer battery core 1 with the capacity of 125mAh is obtained, and the size 3 x 14 x 36 (thickness, width, length, unit mm) of the monomer battery core 1 is obtained; 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: as shown in fig. 3, a positive electrode tab 2 and a negative electrode tab 3 of the battery are respectively installed at two ends of a single battery cell 1, four single battery cells 1 are connected in series and in parallel (two battery cells connected in series are arranged in parallel), a gap between adjacent single battery cells 1 is 10mm, the positive electrode tabs 2 of two adjacent single battery cells 1 are connected through a wire 4, the electrode tabs 3 are connected through a wire 4, and then the single battery cells 1 connected in series are arranged in parallel; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 12g of epoxy resin A glue (main agent) and 6g of epoxy resin B glue (hardening agent), mixing, adding 0.1g of blue coloring agent, and stirring to obtain a precursor of the packaging agent 5; the precursor of the encapsulant 5 in the embodiment is 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 polymerized and cured at normal temperature; epoxy resin A glue and epoxy resin B glue (JH-301) in the embodiment are purchased from the New Material science and technology Co., Ltd. of Dongguan;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, setting the specific shape of the mold according to actual needs, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in a vacuum environment for 30min, taking out after 30min, standing for 5h, and completing battery packaging, namely preparing the flexible battery pack in the embodiment. For convenience of use, any one of the positive electrode tabs 2 and any one of the negative electrode tabs 3 of the battery are exposed to the outside of the encapsulant 5 in this embodiment.
The flexible battery pack in this example was subjected to electrochemical performance tests, and the voltage, internal resistance, and capacity of the battery were measured in the same manner as in example 1.
And (3) measuring results: the battery prepared in this example had a voltage of 8.40V, an internal resistance of 156.21m Ω, and a capacity of 257.61 mAh.
Example 4
A method of making a flexible battery comprising the steps of:
(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;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF)6) The winding core is packaged for the second time, aging and formation are carried out on the winding core, the winding core is packaged for the third time after formation, a monomer battery core 1 with the capacity of 125mAh is obtained, and the size 3 x 14 x 36 (thickness, width, length, unit mm) of the monomer battery core 1 is obtained; 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: as shown in fig. 4, a positive electrode tab 2 and a negative electrode tab 3 of a battery are respectively installed at two ends of a single battery cell 1, and four single battery cells 1 are connected in parallel, wherein a gap between adjacent single battery cells 1 is 2mm, the positive electrode tabs 2 of adjacent single battery cells 1 are connected by a wire 4, and the negative electrode tabs 3 of adjacent single battery cells 1 are connected by a wire 4; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 12g of epoxy resin A glue (main agent) and 6g of epoxy resin B glue (hardening agent), mixing, adding 0.1g of blue coloring agent, and stirring to obtain a precursor of the packaging agent 5; the precursor of the encapsulant 5 in the embodiment is 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 polymerized and cured at normal temperature; epoxy resin A glue and epoxy resin B glue (JH-301) in the embodiment are purchased from the New Material science and technology Co., Ltd. of Dongguan;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, setting the specific shape of the mold according to actual needs, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in the air, standing for 5 hours, and completing the packaging of the battery, namely preparing the flexible battery pack in the embodiment. For convenience of use, any one of the positive electrode tabs 2 and any one of the negative electrode tabs 3 of the battery are exposed to the outside of the encapsulant 5 in this embodiment.
The flexible battery pack in this example was subjected to electrochemical performance tests, and the voltage, internal resistance, and capacity of the battery were measured in the same manner as in example 1.
And (3) measuring results: the battery prepared in this example had a voltage of 4.20V, an internal resistance of 68.62m Ω, and a capacity of 518.15 mAh.
Example 5
A method of making a flexible battery comprising the steps of:
(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;
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 four monomer battery cores 1 with the capacity of 25mAh, wherein the size of each monomer battery core 1 is 62 x 190 (the diameter is 6.2mm, and the height is 19 mm); 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: as shown in fig. 5, a positive electrode tab 2 and a negative electrode tab 3 of the battery are installed at the same end of a single battery cell 1, and four single battery cells 1 are connected in parallel, wherein the positive electrode tab 2 and the negative electrode tab 3 face the same side, a gap between adjacent single battery cells 1 is 2mm, the positive electrode tabs 2 of adjacent single battery cells 1 are connected by a wire 4, and the negative electrode tabs 3 of adjacent single battery cells 1 are connected by a wire 4; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 10g of heat-conducting silica gel A glue and 10g of heat-conducting silica gel B glue, mixing, and adding 0.1g of gray colorant to prepare a precursor of the packaging agent 5; in the embodiment, the precursor of the encapsulant 5 is the heat-conducting silica gel A and the heat-conducting silica gel B, the heat-conducting silica gel A and the heat-conducting silica gel B are mixed in the prior art, and then the mixture is polymerized and cured at normal temperature; the heat-conducting silica gel A glue and the heat-conducting silica gel B glue (JH-907) in the embodiment are purchased from the New Material science and technology company of Polymer macro of Dongguan city;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, setting the specific shape of the mold according to actual needs, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in a vacuum environment for 30min, taking out after 30min, standing for 5h, and completing battery packaging, namely preparing the flexible battery pack in the embodiment. For convenience of use, any one of the positive electrode tabs 2 and any one of the negative electrode tabs 3 of the battery are exposed to the outside of the encapsulant 5 in this embodiment.
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 4.20V, an internal resistance of 213.73m Ω, and a capacity of 105.82 mAh.
Example 6
A method of making a flexible battery comprising the steps of:
(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;
lithium salt is injected into the roll core and is 1mol/L lithium hexafluorophosphate (LiPF)6) The electrolyte is used for carrying out secondary packaging on the winding core, aging and formation are carried out on the winding core, the winding core is packaged for the third time after the formation, four monomer battery cores 1 with the capacity of 25mAh are obtained, and the size 62 x 190 (the diameter of each monomer battery core 1) is obtained6.2mm, height 19 mm); 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: as shown in fig. 6, a positive electrode tab 2 and a negative electrode tab 3 of the battery are respectively installed at two ends of a single battery cell 1, and eight single battery cells are connected in parallel in this embodiment; in the embodiment, the positive electrode tab 2 and the negative electrode tab 3 are in the prior art;
(3) weighing 10g of heat-conducting silica gel A glue and 10g of heat-conducting silica gel B glue, mixing, and adding 0.1g of black coloring agent to prepare a precursor of the packaging agent 5; in the embodiment, the precursor of the encapsulant 5 is the heat-conducting silica gel A and the heat-conducting silica gel B, the heat-conducting silica gel A and the heat-conducting silica gel B are mixed in the prior art, and then the mixture is polymerized and cured at normal temperature; the heat-conducting silica gel A glue and the heat-conducting silica gel B glue (JH-907) in the embodiment are purchased from the New Material science and technology company of Polymer macro of Dongguan city;
(4) and (3) placing the battery pack prepared in the step (2) into a mold, wherein the mold in the embodiment is annular, injecting the liquid precursor prepared in the step (3) into the mold, then placing the mold in a vacuum environment for 240min, taking out after 240min, standing for 5h, and completing battery packaging, so that the flexible battery pack in the embodiment is prepared. For convenience of use, any one of the positive electrode tabs 2 and any one of the negative electrode tabs 3 of the battery are exposed to the outside of the encapsulant 5 in this embodiment.
The flexible battery pack in this example was subjected to electrochemical performance tests, and the voltage, internal resistance, and capacity of the battery were measured in the same manner as in example 1.
And (3) measuring results: the battery prepared in this example had a voltage of 4.20V, an internal resistance of 159.12m Ω, and a capacity of 186.37 mAh.
Example 7
The charge and discharge cycle performance of the flexible battery pack prepared in example 1 was measured:
the battery packs manufactured in example 1 were designated as a flexible battery pack a and a flexible battery pack B, where the flexible battery pack a was not subjected to a bending test as a control group and the flexible battery pack B was subjected to a bending test as an experimental group.
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, performing 180-degree folding test after every 30 bending tests, repeating the bending test for 300 times, performing the folding test for 10 times, and performing the test for 310 times in total.
Fig. 7 and 8 show the results of the battery cycle performance test of the flexible battery pack a and the flexible battery pack B, respectively, and the solid lines in fig. 7 and 8 show the charge capacity and the discharge capacity, respectively, in which the charge capacity curve is located above the discharge capacity curve.
Table 1 shows the results of the cycle performance tests of the flexible battery pack A and the flexible battery pack B
Figure BDA0002680237300000141
As can be seen from table 1, fig. 5 and fig. 6, the flexible battery packs prepared by the two preparation methods of the present invention still maintain good electrochemical cycling performance after being subjected to a bending test.
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 (10)

1. A method for preparing a flexible battery pack, comprising: the method comprises the following steps:
(1) the method comprises the following steps of (1) performing primary packaging on a winding core or a stacked core by adopting an aluminum plastic film, injecting electrolyte, performing secondary packaging after formation, and preparing a monomer battery core;
(2) preparing a battery pack: arranging the monomer battery cores injected with the electrolyte in series, parallel or series-parallel connection, wherein the number of the monomer battery cores is more than 2, and adjacent monomer battery cores are arranged at intervals;
(3) and (3) putting the battery pack obtained in the step (2) into a mould, then injecting a precursor of the packaging agent, and polymerizing the precursor at normal temperature to obtain the flexible battery.
2. The method of manufacturing a flexible battery according to claim 1, characterized in that: the number of the single battery cores is 2-99.
3. The method of manufacturing a flexible battery according to claim 1, characterized in that: the gap between adjacent monomer battery cores is 0-10 mm.
4. The method of manufacturing a flexible battery according to claim 1, characterized in that: the encapsulant comprises one or more of silica gel, silicone grease, polydimethylsiloxane, or epoxy resin.
5. The method of manufacturing a flexible battery according to claim 4, characterized in that: the encapsulant also comprises additives, wherein the additives are colorants, antistatic agents, antioxidants, flame retardants or lubricants.
6. The method of manufacturing a flexible battery according to claim 5, characterized in that: the shape of the mould is circular ring shape, square shape or cuboid shape.
7. The method of manufacturing a flexible battery according to claim 1, characterized in that: and the lugs are arranged on the single battery cell in the battery pack and are 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. The method of manufacturing a flexible battery according to claim 1, characterized in that: and (4) placing the mold of the precursor injected with the packaging agent in the step (3) in a vacuum environment for 0-240 min.
10. A flexible battery manufactured by the manufacturing method of any one of claims 1 to 9.
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