CN105449261A - Soft-packing lithium ion battery - Google Patents
Soft-packing lithium ion battery Download PDFInfo
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- CN105449261A CN105449261A CN201410282822.3A CN201410282822A CN105449261A CN 105449261 A CN105449261 A CN 105449261A CN 201410282822 A CN201410282822 A CN 201410282822A CN 105449261 A CN105449261 A CN 105449261A
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- lithium ion
- ion battery
- packing lithium
- flexible packing
- positive electrode
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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
Abstract
The present invention provides a soft-packing lithium ion battery. The soft-packing lithium ion battery comprises a wound-type electric core, an electrolyte impregnating the wound-type electric core, and a packaging bag packaging the electric core and accommodating the electrolyte. The wound-type electric core comprises a positive electrode sheet, a negative electrode sheet and a barrier film, and the barrier film is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet comprises a positive electrode current collector and a positive electrode film, and the positive electrode film coats the positive electrode current collector and comprises a positive electrode active material, a conductive agent and a binder. The positive electrode sheet also comprises a hot-melt layer, the hot-melt layer coats the surface of the positive electrode current collector, wherein the surface of the positive electrode current collector is located on the outer periphery of the wound-type electric core and is not coated with the positive electrode film, the hot-melt layer comprises one or more of copolymers of ethylene, and the hot-melt layer has viscidity after thermocompression of the soft-packing lithium ion battery, and allows the wound-type electric core and the packaging bag of the soft-packing lithium ion battery to be bonded. The soft-packing lithium ion battery has a good safety performance and high energy density, and meanwhile is simple in preparation process and easy in mass production.
Description
Technical field
The present invention relates to cell art, particularly relate to a kind of flexible packing lithium ion battery.
Background technology
In recent years, along with the development that consumer electronics product is lightening, flexible packing lithium ion battery became more and more important, and its production capacity and output are doubled and redoubled, and reliability when therefore using flexible packing lithium ion battery is had higher requirement.
The battery core of tradition flexible packing lithium ion battery adopts winding or lamination usually, and battery core is directly sealed in packaging bag.Owing to usually there is gap between battery core and packaging bag, when flexible packing lithium ion battery falls for various reasons or rolls, sliding can appear in battery core in packaging bag, and then washes the sealing of packaging bag open, causes electrolyte leakage.
Application number is that the Chinese patent of CN201120357121.3 discloses a kind of epoxy glue that arranges between packaging bag and battery core to improve the method for the fail safe of flexible packing lithium ion battery.In the method, battery core bonds and is fixed on the inwall of packaging bag by epoxy glue, thus ensure that flexible packing lithium ion battery battery core when falling can not be slided, thus the sealing of packaging bag can not be washed open, and then effectively can prevent the electrolyte leakage that is packaged in packaging bag.But because epoxy glue itself has viscosity, the technology difficulty therefore increasing epoxy glue between battery core and packaging bag is comparatively large, is difficult to produce in batches; In addition, epoxy glue is not easy coating evenly, easily causes the thickness of flexible packing lithium ion battery excessive, and then causes energy density to decline.
Application number is that the Chinese patent of CN201110045468.9 discloses one in rolled-up electrode unit arranged outside adhesive, the space between rolled-up electrode unit and battery case is filled up, rolled-up electrode unit to be fixed on the method in battery case by the expansion after adhesive dipping electrolyte.The method can suppress rolled-up electrode unit rocking and rotating when external impact, thus improves the reliability of battery.But the method is not suitable for being applied in flexible packing lithium ion battery, one be the battery case of flexible packing lithium ion battery is aluminium plastic packaging bag, and its profile changes with the expansion of adhesive, cannot fixing wound electrode unit; Two is that the expansion of adhesive can cause the thickness of flexible packing lithium ion battery to increase, and then greatly reduces the energy density of flexible packing lithium ion battery.
Summary of the invention
In view of Problems existing in background technology, the object of the present invention is to provide a kind of flexible packing lithium ion battery, described flexible packing lithium ion battery has good security performance and higher energy density, simultaneously simple, the easy volume production of its preparation technology.
In order to achieve the above object, the invention provides a kind of flexible packing lithium ion battery, it comprises: takeup type battery core; Electrolyte, dipping takeup type battery core; And packaging bag, packaging electric core accommodating electrolyte.Takeup type battery core comprises: positive plate; Negative plate; And barrier film, be interval between positive plate and negative plate.Positive plate comprises: plus plate current-collecting body; And positive pole diaphragm, to be coated on plus plate current-collecting body and to comprise positive electrode active materials, conductive agent, binding agent.Negative plate comprises: negative current collector; And cathode membrane, to be coated on negative current collector and to comprise negative active core-shell material, conductive agent, binding agent.Positive plate also comprises hot melt layer; Hot melt layer be coated in plus plate current-collecting body be in the periphery of takeup type battery core and on the uncoated surface having positive pole diaphragm; Hot melt layer comprises one or more in ethylene copolymer; Hot melt layer has viscosity after flexible packing lithium ion battery hot pressing, bonds with the takeup type battery core and packaging bag that make flexible packing lithium ion battery.
Beneficial effect of the present invention is as follows:
1. the present invention by increasing hot melt layer in the positive plate of flexible packing lithium ion battery, and there is softening melting thus there is viscosity in hot melt layer after hot pressing, takeup type battery core, hot melt layer can be made, packaging bag is bonded together tightly, thus fall at flexible packing lithium ion battery, the machinery such as cylinder abuse time, can ensure that takeup type battery core there will not be slip, and then can effectively prevent the sealing of packaging bag to be rushed to open because of the slip of takeup type battery core the problem finally causing electrolyte leakage, substantially increase the security performance of flexible packing lithium ion battery.
2. the present invention is simple by the preparation technology at flexible packing lithium ion battery, easy volume production, and the energy density of flexible packing lithium ion battery is higher.
Accompanying drawing explanation
Fig. 1 illustrates the planar structure schematic diagram according to flexible packing lithium ion battery of the present invention;
Fig. 2 is the planar structure schematic diagram of the positive plate of Fig. 1.
Wherein, description of reference numerals is as follows:
1 takeup type battery core
11 positive plates
111 plus plate current-collecting bodies
112 positive pole diaphragms
113 hot melt layers
12 negative plates
121 negative current collectors
122 cathode membrane
13 barrier films
2 packaging bags
Embodiment
The following detailed description of flexible packing lithium ion battery according to the present invention and embodiment, comparative example and test result.
First illustrate according to flexible packing lithium ion battery of the present invention.
See figures.1.and.2, flexible packing lithium ion battery according to the present invention comprises: takeup type battery core 1; Electrolyte (not shown), dipping takeup type battery core 1; And packaging bag 2, packaging electric core 1 accommodating electrolyte.Takeup type battery core 1 comprises: positive plate 11; Negative plate 12; And barrier film 13, be interval between positive plate 11 and negative plate 12.Positive plate 11 comprises: plus plate current-collecting body 111; And positive pole diaphragm 112, to be coated on plus plate current-collecting body 111 and to comprise positive electrode active materials, conductive agent, binding agent.Negative plate 12 comprises: negative current collector 121; And cathode membrane 122, to be coated on negative current collector 121 and to comprise negative active core-shell material, conductive agent, binding agent.Positive plate 11 also comprises hot melt layer 113; Hot melt layer 113 be coated in plus plate current-collecting body 111 be in the periphery of takeup type battery core 1 and on the uncoated surface having positive pole diaphragm 112; Hot melt layer 113 comprises one or more in ethylene copolymer; Hot melt layer 113 has viscosity after flexible packing lithium ion battery hot pressing, bonds with packaging bag 2 to make the takeup type battery core 1 of flexible packing lithium ion battery.
In flexible packing lithium ion battery according to the present invention, the material of hot melt layer 113 is molten state or solution state, and therefore employing coating equipment is readily embodied in the even coating on plus plate current-collecting body; Hot melt layer 113 does not have viscosity after drying and forming-film, can facilitate follow-up process operations; After flexible packing lithium ion battery hot pressing, the material softening of hot melt layer 113 melts thus has viscosity, battery core 1, hot melt layer 113 can be made, packaging bag 2 is bonded together tightly, thus fall at flexible packing lithium ion battery, the machinery such as cylinder abuse time, can ensure that battery core 1 there will not be slip, and then can effectively prevent the sealing of packaging bag 2 to be rushed to open because of the slip of battery core 1 problem finally causing electrolyte leakage, substantially increase the security performance of flexible packing lithium ion battery.
In flexible packing lithium ion battery according to the present invention, the thickness of hot melt layer 113 can be 5 μm ~ 100 μm, preferably can be 10 μm ~ 50 μm.If hot melt layer 113 is too thick, the useful space of flexible packing lithium ion battery can be caused to diminish, reduce the energy density of flexible packing lithium ion battery; If hot melt layer 113 is too thin, the battery core 1 of flexible packing lithium ion battery is too little with the cohesive force of packaging bag 2, causes not having protective effect when flexible packing lithium ion battery falls.
In flexible packing lithium ion battery according to the present invention, in described ethylene copolymer, the mass percentage of vinyl monomer can be 60% ~ 90%.If the mass percentage of vinyl monomer is lower than 60%, then the caking property of hot melt layer 113 can be deteriorated; If the mass percentage of vinyl monomer is higher than 90%, then the hot melting temperature of hot melt layer 113 is too high, is therefore difficult to realize bonding.
In flexible packing lithium ion battery according to the present invention, described ethylene copolymer can be selected from ethene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl acrylate copolymer (EBA), ethylene methyl methacrylate copolymer (EMMA), ethene-vinyl acetate-hydroxyl terpolymer (E/VA/CO), ethylene/n-butyl acrylate-hydroxyl terpolymer (E/NBA/CO), one or more of ethylene/n-butyl acrylate-glycidyl ester copolymer (E/NBA/GMA).
In flexible packing lithium ion battery according to the present invention, described ethylene copolymer can adopt hot melt to melt.
In flexible packing lithium ion battery according to the present invention, the melting temperature of described hot melt can be 80 DEG C ~ 120 DEG C.
In flexible packing lithium ion battery according to the present invention, described ethylene copolymer can adopt solvent method to dissolve to realize the coating on the surface of plus plate current-collecting body 111.
According in flexible packing lithium ion battery of the present invention, when described ethylene copolymer adopts solvent method to dissolve, described solvent can be selected from one or more in toluene, cyclohexane.
In flexible packing lithium ion battery according to the present invention, when described ethylene copolymer adopts solvent method to dissolve, the weight ratio of described ethylene copolymer and described solvent can be 5:95 ~ 20:80.
Following explanation is according to the embodiment of flexible packing lithium ion battery of the present invention and comparative example.
Embodiment 1
1. the preparation of the positive plate of flexible packing lithium ion battery
(1) by positive active material cobalt acid lithium (LiCoO
2), conductive agent conductive carbon (SuperP), binding agent Kynoar (PVDF) in mass ratio 96:2:2 be dissolved in solvent N-methyl pyrilidone (NMP), stir, obtain anode sizing agent, afterwards anode sizing agent is coated on thickness be the plus plate current-collecting body aluminium foil 111 of 12 μm wherein one side on, afterwards through super-dry, cold pressing, obtain the positive pole diaphragm 112 that compacted density is 3.8g/cm3;
(2) ethene-vinyl acetate copolymer (EVA) is dissolved in cyclohexane and makes colloid, wherein, in EVA, the mass percentage of vinyl monomer is 75%, the weight ratio of EVA and cyclohexane is 20:80, afterwards colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 10 μm, coated length is 12mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
2. the preparation of the negative plate of flexible packing lithium ion battery
By negative electrode active material graphite, conductive agent conductive carbon (SuperP), binding agent butadiene-styrene rubber (SBR) and thickener sodium carboxymethylcellulose (CMC) in mass ratio 94:2:2:2 be dissolved in solvent deionized water, stir, obtain cathode size, afterwards cathode size is coated on thickness be the negative current collector Copper Foil 121 of 10 μm wherein one side on, afterwards through super-dry, cold pressing, obtaining compacted density is 1.6g/cm
3cathode membrane 122, then through cut-parts, welding negative lug, obtain the negative plate 12 of flexible packing lithium ion battery.
3. the preparation of the electrolyte of flexible packing lithium ion battery
Using methyl ethyl carbonate (EMC), diethyl carbonate (DEC), ethylene carbonate (EC), propene carbonate (PC) in mass ratio 1:1:1:1 mix as non-aqueous organic solvent, add lithium hexafluoro phosphate (LiPF afterwards
6) as lithium salts, make LiPF
6concentration be 1M, obtain the electrolyte of flexible packing lithium ion battery.
4. the preparation of flexible packing lithium ion battery
Positive plate 11, negative plate 12 and barrier film 13 (thickness is the PP/PE/PP film of 16 μm) is wound into battery core (i.e. takeup type battery core 1) successively, use packaging bag 2 (aluminum-plastic packaging bag) by battery core closedtop and side seal afterwards, leave liquid injection port, afterwards 85 DEG C, carry out hot pressing process under 0.5Mpa, then through injecting electrolyte, change into, the operation such as capacity obtains flexible packing lithium ion battery.
Embodiment 2
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
(2) ethylene-ethyl acrylate copolymer (EEA) is dissolved in toluene and makes colloid, wherein, in EEA, the mass percentage of vinyl monomer is 80%, the weight ratio of EEA and toluene is 5:95, afterwards colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 50 μm, coated length is 6mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Embodiment 3
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
(2) ethylene-ethyl acrylate copolymer (EEA) and ethene-vinyl acetate copolymer (EVA) are dissolved in cyclohexane and make colloid, wherein, in EEA, the mass percentage of vinyl monomer is 80%, in EVA, the mass percentage of vinyl monomer is 75%, EEA, the weight ratio of EVA and cyclohexane is 5:5:90, afterwards colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 20 μm, coated length is 6mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Embodiment 4
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
(2) ethene-vinyl acetate copolymer (EVA) is melted at 80 DEG C, make molten colloid, wherein, in EVA, the mass percentage of vinyl monomer is 60%, afterwards molten colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 25 μm, coated length is 6mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Embodiment 5
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
(2) ethylene-ethyl acrylate copolymer (EEA) is melted at 120 DEG C, make molten colloid, wherein, in EEA, the mass percentage of vinyl monomer is 90%, afterwards molten colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 20 μm, coated length is 12mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Embodiment 6
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
(2) ethene-vinyl acetate copolymer (EVA) and ethylene-ethyl acrylate copolymer (EEA) are melted at 110 DEG C, make molten colloid, wherein, in EVA, the mass percentage of vinyl monomer is 60%, in EEA, the mass percentage of vinyl monomer is 90%, the weight ratio of EEA and EVA is 20:80, afterwards molten colloid is coated on plus plate current-collecting body 111 be in the periphery of battery core 1 and uncoatedly have on the surface (the afterbody white space namely in Fig. 2) of positive pole diaphragm 112, wherein coating thickness is 20 μm, coated length is 12mm (outer perimeter of battery core is 12mm), the hot melt layer 113 obtained after drying, afterwards through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Comparative example 1
Method according to embodiment 1 prepares flexible packing lithium ion battery, just in the preparation (step 1) of the positive plate of flexible packing lithium ion battery:
By positive active material cobalt acid lithium (LiCoO
2), conductive agent conductive carbon (SuperP), binding agent Kynoar (PVDF) in mass ratio 96:2:2 be dissolved in solvent N-methyl pyrilidone (NMP), stir, obtain anode sizing agent, afterwards anode sizing agent is coated on thickness be the plus plate current-collecting body aluminium foil 111 of 12 μm wherein one side on, afterwards through super-dry, cold pressing, obtaining compacted density is 3.8g/cm
3positive pole diaphragm 112, then through cut-parts, welding positive pole ear, obtain the positive plate 11 of flexible packing lithium ion battery.
Finally provide performance test process and the test result of the flexible packing lithium ion battery of embodiment 1-6 and comparative example 1.
(1) flexible packing lithium ion battery fall simulation test
Often group gets 5 flexible packing lithium ion batteries, afterwards at 25 DEG C, with 0.5C multiplying power constant current charge to 4.2V, afterwards with 4.2V constant voltage charge to 0.05C, afterwards leave standstill 1h, afterwards simulation test is fallen to flexible packing lithium ion battery.
The open circuit voltage of flexible packing lithium ion battery is measured with universal instrument, with mightiness belt, flexible packing lithium ion battery is fixed on battery mould afterwards, subsequently battery mould is dropped to rigid ground from the height of 1.5 meters, drop test is carried out in 6 faces respectively along flexible packing lithium ion battery, wherein test 6 times for each, 36 times altogether.If smoldering appears in flexible packing lithium ion battery, on fire, leak, then represent not by falling simulation test.
(2) the cylinder simulation test of flexible packing lithium ion battery
Often group gets 5 flexible packing lithium ion batteries, afterwards at 25 DEG C, with 0.5C multiplying power constant current charge to 4.2V, afterwards with 4.2V constant voltage charge to 0.05C, afterwards leave standstill 1h, afterwards cylinder simulation test is carried out to flexible packing lithium ion battery.
The open circuit voltage of flexible packing lithium ion battery is measured with universal instrument, with mightiness belt, flexible packing lithium ion battery is fixed on battery mould afterwards, being put into by battery mould is subsequently highly the testing drum machine of 1 meter, wherein testing drum machine rotation per minute 16 times.If smoldering appears in flexible packing lithium ion battery, on fire, leak, then represent not by cylinder simulation test.
Table 1 provides the performance test results of embodiment 1-6 and comparative example 1.
As can be seen from the contrast of embodiment 1-6 and comparative example 1, the security performance of flexible packing lithium ion battery of the present invention is improved significantly.This is because flexible packing lithium ion battery of the present invention has hot melt layer 113, it softens melting after hot-pressing thus has viscosity, battery core 1, hot melt layer 113 can be made, packaging bag 2 is bonded together tightly, thus fall at flexible packing lithium ion battery, the machinery such as cylinder abuse time, can ensure that battery core 1 there will not be slip, and then can effectively prevent the sealing of packaging bag 2 to be rushed to open because of the slip of battery core 1 problem finally causing electrolyte leakage, substantially increase the security performance of flexible packing lithium ion battery.
As can be seen from the contrast of embodiment 1-6 and comparative example 1, flexible packing lithium ion battery of the present invention has higher operating voltage, thus can ensure that flexible packing lithium ion battery has higher energy density.
Claims (10)
1. a flexible packing lithium ion battery, comprising:
Takeup type battery core (1), comprising:
Positive plate (11), comprising:
Plus plate current-collecting body (111); And
Positive pole diaphragm (112), is coated in plus plate current-collecting body (111) and goes up and comprise positive electrode active materials, conductive agent, binding agent;
Negative plate (12), comprising:
Negative current collector (121); And
Cathode membrane (122), is coated in negative current collector (121) and goes up and comprise negative active core-shell material, conductive agent, binding agent;
Barrier film (13), is interval between positive plate (11) and negative plate (12);
Electrolyte, dipping takeup type battery core (1); And
Packaging bag (2), packaging electric core (1) accommodating electrolyte;
It is characterized in that,
Positive plate (11) also comprises hot melt layer (113);
Hot melt layer (113) be coated in plus plate current-collecting body (111) be in the periphery of takeup type battery core (1) and on the uncoated surface having positive pole diaphragm (112);
Hot melt layer (113) comprises one or more in ethylene copolymer;
Hot melt layer (113) has viscosity after flexible packing lithium ion battery hot pressing, bonds to make the takeup type battery core (1) of flexible packing lithium ion battery and packaging bag (2).
2. flexible packing lithium ion battery according to claim 1, is characterized in that, the thickness of hot melt layer (113) is 5 μm ~ 100 μm.
3. flexible packing lithium ion battery according to claim 2, is characterized in that, the thickness of hot melt layer (113) is 10 μm ~ 50 μm.
4. flexible packing lithium ion battery according to claim 1, is characterized in that, in described ethylene copolymer, the mass percentage of vinyl monomer is 60% ~ 90%.
5. flexible packing lithium ion battery according to claim 1, it is characterized in that, described ethylene copolymer is selected from ethene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl acrylate copolymer (EBA), ethylene methyl methacrylate copolymer (EMMA), ethene-vinyl acetate-hydroxyl terpolymer (E/VA/CO), ethylene/n-butyl acrylate-hydroxyl terpolymer (E/NBA/CO), one or more of ethylene/n-butyl acrylate-glycidyl ester copolymer (E/NBA/GMA).
6. flexible packing lithium ion battery according to claim 1, is characterized in that, described ethylene copolymer adopts hot melt to melt.
7. flexible packing lithium ion battery according to claim 6, is characterized in that, the melting temperature of described hot melt is 80 DEG C ~ 120 DEG C.
8. flexible packing lithium ion battery according to claim 1, is characterized in that, described ethylene copolymer adopts solvent method to dissolve to realize the coating on the surface of plus plate current-collecting body (111).
9. flexible packing lithium ion battery according to claim 8, is characterized in that, described solvent is selected from one or more in toluene, cyclohexane.
10. flexible packing lithium ion battery according to claim 8 or claim 9, it is characterized in that, the weight ratio of described ethylene copolymer and described solvent is 5:95 ~ 20:80.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410282822.3A CN105449261A (en) | 2014-06-20 | 2014-06-20 | Soft-packing lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410282822.3A CN105449261A (en) | 2014-06-20 | 2014-06-20 | Soft-packing lithium ion battery |
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| CN105449261A true CN105449261A (en) | 2016-03-30 |
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ID=55559214
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| CN201410282822.3A Pending CN105449261A (en) | 2014-06-20 | 2014-06-20 | Soft-packing lithium ion battery |
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| WO2018054332A1 (en) * | 2016-09-22 | 2018-03-29 | 宁德新能源科技有限公司 | Wound cell |
| CN110071320A (en) * | 2018-01-22 | 2019-07-30 | 宁德新能源科技有限公司 | Battery core and battery |
| CN111786032A (en) * | 2020-06-04 | 2020-10-16 | 惠州锂威新能源科技有限公司 | Preparation method of anti-drop lithium ion battery |
| CN112534607A (en) * | 2019-12-31 | 2021-03-19 | 宁德新能源科技有限公司 | Battery and electronic device |
| CN113054325A (en) * | 2019-12-27 | 2021-06-29 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| WO2021179256A1 (en) * | 2020-03-12 | 2021-09-16 | 宁德新能源科技有限公司 | Electrode assembly and battery |
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| CN111786032A (en) * | 2020-06-04 | 2020-10-16 | 惠州锂威新能源科技有限公司 | Preparation method of anti-drop lithium ion battery |
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Application publication date: 20160330 |