CN105047997A - Lithium ion battery cell, lithium ion battery produced with the lithium ion battery cell and preparation method of the lithium ion battery - Google Patents
Lithium ion battery cell, lithium ion battery produced with the lithium ion battery cell and preparation method of the lithium ion battery Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 153
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 51
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000004888 barrier function Effects 0.000 claims description 131
- 239000000758 substrate Substances 0.000 claims description 74
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 199
- 238000007731 hot pressing Methods 0.000 description 58
- 238000003825 pressing Methods 0.000 description 57
- 229920002125 Sokalan® Polymers 0.000 description 27
- 239000002904 solvent Substances 0.000 description 27
- 239000002033 PVDF binder Substances 0.000 description 26
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 26
- 230000000694 effects Effects 0.000 description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 16
- 229910052782 aluminium Inorganic materials 0.000 description 16
- 239000002002 slurry Substances 0.000 description 16
- 238000002474 experimental method Methods 0.000 description 14
- 239000012528 membrane Substances 0.000 description 14
- 239000002985 plastic film Substances 0.000 description 14
- 229920006255 plastic film Polymers 0.000 description 14
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 13
- 239000000843 powder Substances 0.000 description 13
- 239000004743 Polypropylene Substances 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000004698 Polyethylene Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 239000012982 microporous membrane Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 239000004584 polyacrylic acid Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000003475 lamination Methods 0.000 description 5
- 239000011149 active material Substances 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium ion battery, a lithium ion battery produced with the lithium ion battery cell and a preparation method of the lithium ion battery. The battery cell comprises a first pole piece, a separator and a second pole piece, wherein the separator is interposed between the first pole piece and the second pole piece; the separator comprises a separator base material layer; a nano-scale aluminium oxide layer is applied and bonded to a top surface of the separator base material layer; the aluminium oxide layer directly faces and contacts the first pole piece; a binding material layer is applied to a bottom surface of the separator base material layer; the binding material layer directly faces and contacts the second pole piece. The technical project of the embodiment is beneficial to improving the heat resisting property of the lithium ion battery, reducing the temperature of the battery and increasing the security of the battery.
Description
Technical field
The present invention relates to lithium-ion electric core body field, particularly relate to a kind of lithium-ion electric core body and its lithium ion battery made and preparation method.
Background technology
Lithium ion battery uses more extensive at present in all kinds of consumer electronics product, but its fail safe is rather troubling, in the lithium ion battery of mainly its mobile phone and computer use, positive pole is the high cobalt acid lithium material of energy density, cobalt acid lithium battery has high-energy, platform is high, long-life advantage, its runaway temperature is only 150 DEG C simultaneously, so due in use procedure, the such as short circuit of various abnormal cause, to overcharge etc. and cause temperature to rise, reach diaphragm retracts temperature (about 110 DEG C), both positive and negative polarity crosses membrane contacts short circuit, heat increases severely and causes cells burst, jeopardize the person and the property safety of consumer, therefore, utilize the caking property of PVDF and pole piece on the thermal endurance of alundum (Al2O3) and barrier film, can prevent the pole powder on electrode be scattered and barrier film heat shrinkable cause both positive and negative polarity short circuit, obtain satisfied security performance.
Summary of the invention
One of object of the embodiment of the present invention is to provide a kind of lithium-ion electric core body and its lithium ion battery made and preparation method.Application the present embodiment technical scheme is conducive to the heat resistance improving lithium ion battery, reduces the temperature of battery, improves the fail safe of battery.
A kind of lithium-ion electric core body that the embodiment of the present invention provides, comprises the first pole piece, barrier film, the second pole piece, is interposed between described first pole piece, the second pole piece between described barrier film,
Described barrier film comprises barrier film substrate layer, also applies be bonded with nano level alundum (Al2O3) layer at the end face of described barrier film substrate layer, described alundum (Al2O3) layer and described first pole piece just to contacting,
Be covered with bonding material layer in the coated on bottom side of described barrier film substrate layer, described bonding material layer and described second pole piece are just to contacting.
Alternatively, described first pole piece is negative plate, and described second pole piece is positive plate.
Alternatively, the thickness of described alundum (Al2O3) layer is 0.1 μm ~ 5 μm.
Alternatively, the thickness of described alundum (Al2O3) layer is 4 μm.
Alternatively, the thickness of described bonding material layer is 0.1 μm ~ 5 μm.
Alternatively, the thickness of described bonding material layer is 3 μm.
Alternatively, the thickness of described barrier film substrate layer is 9 μm ~ 40 μm.
Alternatively, the thickness of described barrier film substrate layer is 10 μm.
Alternatively, the granularity of described alundum (Al2O3) is 10nm ~ 100nm.
Alternatively, the granularity of described alundum (Al2O3) is 10nm ~ 30nm.
Alternatively, the molecular weight of described bonding material layer is 500,000 ~ 2,000,000.
Alternatively, described bonding material layer is: polyvinylidene fluoride layer or polypropylene acid layer.
Alternatively, described lithium-ion electric core body is: winding battery core body or laminated battery core body.
Alternatively, described alundum (Al2O3) layer is mixed by alundum (Al2O3) and solvent N-methyl pyrilidone, and wherein the mass percent of alundum (Al2O3) and described 1-METHYLPYRROLIDONE is: 30%:70%.
Alternatively, described bonding material layer is mixed by Kynoar and solvent N-methyl pyrilidone, and wherein the mass percent of Kynoar and described 1-METHYLPYRROLIDONE is: 15%:70%.
Alternatively, described bonding material layer is mixed by polyacrylic acid and solvent N-methyl pyrilidone, and wherein the mass percent of polyacrylic acid and described 1-METHYLPYRROLIDONE is: 15%:70%.
Alternatively, described bonding material layer is together with described second pole piece adhesive bond.
A kind of lithium ion battery that the embodiment of the present invention provides, wraps the arbitrary described lithium-ion electric core body and aluminum plastic film housing stated,
In described aluminum plastic film housing, be also perfused with electrolyte, described electrolyte permeability is in described battery core body.
The preparation method of a kind of lithium ion battery that the embodiment of the present invention provides, is characterized in that,
Make the lithium-ion electric core body of above-mentioned arbitrary described structure,
Be encapsulated in aluminum plastic film housing by described lithium ion battery cell body, toward described aluminum plastic film shell perfusion in vivo electrolyte, seal aluminum plastic putamina body, obtains lithium ion battery, changes into described lithium ion battery.
Alternatively, after changing into described lithium ion battery, also comprise:
Lithium ion battery described in hot pressing, makes the bonding material layer on the barrier film in described lithium ion battery together with described second pole piece adhesive bond;
Then to cold pressing immediately described lithium ion battery, make the described bonding material layer on the barrier film in described lithium ion battery and described second pole piece bond formed-knot and be combined.
Alternatively, hot pressing temperature is: at 50 DEG C ~ 100 DEG C, and hot pressing pressure is 0.05kg/mm2 ~ 0.90kg/mm2, and hot pressing time is 2min ~ 60min;
Temperature of colding pressing is 18 DEG C ~ 20 DEG C, and pressure of colding pressing is 0.05kg/mm2 ~ 0.90kg/mm2, and the time of colding pressing is 2min ~ 60min.
Alternatively, described hot pressing temperature is: 60 DEG C, and described hot pressing pressure is: 0.20kg/mm2, and described hot pressing time is: 10min.
Alternatively, described in temperature of colding pressing be 20 DEG C, described in pressure of colding pressing be: 0.5kg/mm2, described in the time of colding pressing be: 5min.
11, lithium-ion electric core body according to claim 1, is characterized in that,
The molecular weight of described bonding material layer is 500,000 ~ 2,000,000.
12, according to arbitrary described lithium-ion electric core body of claim 1 to 12, it is characterized in that,
Described bonding material layer is: polyvinylidene fluoride layer or polypropylene acid layer.
13, according to arbitrary described lithium-ion electric core body of claim 1 to 12, it is characterized in that,
Described lithium-ion electric core body is: winding battery core body or laminated battery core body.
14, according to the lithium-ion electric core body described in claim 1 to 12, it is characterized in that,
Described alundum (Al2O3) layer is mixed by alundum (Al2O3) and solvent N-methyl pyrilidone, and wherein the mass percent of alundum (Al2O3) and described 1-METHYLPYRROLIDONE is: 30%:70%.
15, according to the lithium-ion electric core body described in claim 1 to 12, it is characterized in that,
Described bonding material layer is mixed by Kynoar and solvent N-methyl pyrilidone, and wherein the mass percent of Kynoar and described 1-METHYLPYRROLIDONE is: 15%:70%.
16, according to the lithium-ion electric core body described in claim 1 to 12, it is characterized in that,
Described bonding material layer is mixed by polyacrylic acid and solvent N-methyl pyrilidone, and wherein the mass percent of polyacrylic acid and described 1-METHYLPYRROLIDONE is: 15%:70%.
17, according to the lithium-ion electric core body described in claim 1 to 12, it is characterized in that,
Described bonding material layer is together with described second pole piece adhesive bond.
18, a lithium ion battery, is characterized in that, comprises arbitrary described lithium-ion electric core body and the aluminum plastic film housing of claim 1 to 17,
In described aluminum plastic film housing, be also perfused with electrolyte, described electrolyte permeability is in described battery core body.
19, a preparation method for lithium ion battery according to claim 18, is characterized in that,
Make the lithium-ion electric core body of the arbitrary described structure of claim 1 to 16,
Be encapsulated in aluminum plastic film housing by described lithium ion battery cell body, toward described aluminum plastic film shell perfusion in vivo electrolyte, seal aluminum plastic putamina body, obtains lithium ion battery, changes into described lithium ion battery.
20, the preparation method of lithium ion battery according to claim 19, is characterized in that,
After changing into described lithium ion battery, also comprise:
Lithium ion battery described in hot pressing, makes the bonding material layer on the barrier film in described lithium ion battery together with described second pole piece adhesive bond;
Then to cold pressing immediately described lithium ion battery, make the described bonding material layer on the barrier film in described lithium ion battery and described second pole piece bond formed-knot and be combined.
21, the preparation method of lithium ion battery according to claim 20, is characterized in that,
Hot pressing temperature is: at 50 DEG C ~ 100 DEG C, and hot pressing pressure is 0.05kg/mm2 ~ 0.90kg/mm2, and hot pressing time is 2min ~ 60min;
Temperature of colding pressing is 18 DEG C ~ 20 DEG C, and pressure of colding pressing is 0.05kg/mm2 ~ 0.90kg/mm2, and the time of colding pressing is 2min ~ 60min.
22, the preparation method of lithium ion battery according to claim 21, is characterized in that,
Described hot pressing temperature is: 60 DEG C, and described hot pressing pressure is: 0.20kg/mm2, and described hot pressing time is: 10min.
The preparation method of the lithium ion battery 23, according to claim 21 or 22, is characterized in that,
Described temperature of colding pressing is 20 DEG C, described in pressure of colding pressing be: 0.5kg/mm2, described in the time of colding pressing be: 5min.
Therefore, adopt the present embodiment technical scheme, because the two sides of the barrier film of the present embodiment is coated with Al in face respectively
2o
3layer 20, bonding material layer 30, barrier film interval is between the sheet of any the two poles of the earth, the high temperature of pole piece can be prevented to be delivered to barrier film substrate layer 10 and to cause barrier film heat shrinkable and cause the positive/negative plate on barrier film both sides contact and cause short circuit, and adopt the present embodiment technical scheme to also help the cutting resistance improving barrier film, anti-heavy impact performance, is conducive to the security performance of the lithium ion battery improving the present embodiment.
In addition, experiment proves, the present embodiment makes Al
2o
3layer 20 faces with negative plate and contacts, can obtain more excellent purpose less than effect, can more be conducive to preventing high temperature be delivered to barrier film substrate layer 10 and affect membrane properties, wall barrier film temperature is too high, more be conducive to the security performance of the lithium ion battery improving the present embodiment, the analysis of experimental data seen below in detail further.
In addition, the present embodiment can also after lithium ion battery changes into, hot pressing and cold pressing treatment are carried out to the lithium ion battery after changing into, make barrier film bonding material layer 30 on one side respectively with it just to the pole piece adhesive bond contacted, the active material layer of this pole piece is bonded to be wrapped in bonding material layer 30, the active material on pole piece now can also be prevented to be scattered, and be conducive to avoiding barrier film heat shrinkable further and causing both positive and negative polarity short circuit and cause potential safety hazard, therefore adopt this technical scheme, be conducive to the short circuit ratio reducing lithium ion battery further, improve the application security of battery.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention.
A kind of structural representation of lithium-ion electric core body pole piece of Fig. 1 for providing in the specific embodiment of the invention.
Reference numeral:
10: barrier film substrate layer; 20: alundum (Al2O3) (Al
2o
3) layer; 30: bonding material layer.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Shown in Figure 1, present embodiments provide a kind of barrier film being applicable to lithium ion battery, the present embodiment barrier film mainly comprises barrier film substrate layer 10, is coated with alundum (Al2O3) (Al in a surface bonding of barrier film substrate layer 10
2o
3) layer 20, be also coated with bonding material layer 30 on another surface of barrier film substrate layer 10.
As the signal of the present embodiment, the Al on the present embodiment barrier film
2o
3the Al of the nano-scale particle size that layer 20 adopts
2o
3powder, as the signal of the present embodiment, such as but be not limited to choose particle size range and be: the Al of 10nm ~ 100nm
2o
3powder makes Al as the material such as raw material mixed adhesive of the present embodiment
2o
3slurry, by this Al
2o
3slurry is coated in the one side of barrier film, and then namely dry roll-in obtains and be bonded with Al
2o
3the barrier film of layer 20.
As the signal of the present embodiment, the present embodiment preferred size scope is the Al of 10nm ~ 30nm
2o
3powder is as raw material.
The present inventor is carrying out finding in embodiment of the present invention research process to adopt nano-scale particle size scope to be 10nm ~ 30nm powder, due to Al
2o
3the specific surface of powder is large, is conducive to the liquid absorption improving lithium ion battery, improves the capacity of battery.
As the signal of the present embodiment, the jointing material of this enforcement can be, but not limited to select Kynoar (Polyvinylidenefluoride, be called for short PVDF) or polyacrylic acid (Polyacrylicacid, be called for short PAA), or the jointing material be made up of PVDF mixing PAA.
As the signal of the present embodiment, the present embodiment preferably select molecular weight be the daltonian jointing material in 500,000 dalton ~ 2,000,000 as raw material, such as but be not limited to select molecular weight to be the raw materials of 800,000 daltonian jointing materials as bonding material layer 30.
Barrier film substrate layer 10 in this enforcement can be various barrier film of the prior art, such as can be the microporous membrane that monolayer polyethylene (Polyethylene is called for short PE) layer is made; Or be the microporous membrane that polypropylene (Polypropylene is called for short PP) layer is made; Or by PE microporous membrane, be composited with PP microporous membrane, wherein PE microporous membrane is positioned at intermediate layer, PP microporous membrane is positioned at two surfaces of PE microporous membrane.
The thickness range of the barrier film substrate layer 10 in the present embodiment is 9 ~ 40um, such as 9um, 10um, 12um, 40um, specifically selects according to actual.
As the signal of the present embodiment, the thickness of the barrier film substrate layer 10 of the present embodiment can be, but not limited to be 9 μm ~ 40 μm.For example the present embodiment preferably 10 μm.
As the signal of the present embodiment, the Al of the present embodiment
2o
3the thickness of layer 20 and bonding material layer 30 can be set to 0.1 μm ~ 5 μm.The for example preferred Al of the present embodiment
2o
3the thickness of layer 20 is 4 μm, and the thickness of bonding material layer 30 is preferably 3 μm.
Above-mentioned one side is adopted to be coated with Al
2o
3the barrier film that layer 20 another side are coated with bonding material layer 30 is combined with the first pole piece, the second pole piece makes lithium-ion electric core body, makes the Al of barrier film
2o
3layer 20 faces with the first pole piece and contacts, and the bonding material layer 30 of barrier film faces with the second pole piece and contacts.
Wherein the first pole piece is the arbitrary of positive plate or negative plate, and the second pole piece is another of positive plate or negative plate.Preferred as the present embodiment, wherein the first pole piece is the arbitrary of negative plate, and the second pole piece is positive plate.
As the signal of the present embodiment, the lithium-ion electric core body of the present embodiment can for winding battery core body, also can be laminated cell body.
As the signal of the present embodiment, when utilizing the core of lithium ion cell of said structure to make lithium ion battery, can be, but not limited to conventionally the lithium-ion electric core body of said structure is packaged in predetermined aluminum plastic film housing, then electrolyte filling is carried out, electrolyte is made to infiltrate in barrier film in battery core body and pole piece in aluminum plastic film housing, carry out aluminum plastic film housing seal, obtain lithium ion battery, by formation cabinet on the lithium ion battery that obtains, conventionally carry out low current charge to change into, obtain the lithium ion battery of the present embodiment.
As the signal of the present embodiment, after lithium ion battery changes into, also further hot pressing is carried out to lithium ion battery, after hot-pressing processing, carry out cold pressing treatment immediately.Specifically, hot pressing lithium ion battery, wherein hot pressing temperature is: 50 DEG C ~ 100 DEG C, hot pressing pressure is: 0.05kg/mm2 ~ 0.90kg/mm2, hot pressing time is: 2min ~ 60min, make the bonding material layer 30 on barrier film with its just to the second pole piece adhesive bond contacted together.
As the signal of the present embodiment, preferably adopt following hot compression parameters: hot pressing temperature is: 60 DEG C, and hot pressing pressure is: 0.20kg/mm2, and hot pressing time is: 10min.
After hot-pressing processing, to cold pressing immediately this lithium ion battery, temperature of wherein colding pressing is: 18 DEG C ~ 20 DEG C, pressure of colding pressing is: 0.05kg/mm2 ~ 0.90kg/mm2, the time of colding pressing is: 2min ~ 60min, makes the bonding material layer 30 of barrier film one side and the second pole piece be bonded formed-knot by Van der Waals force and is combined.
As the signal of the present embodiment, preferably adopt following parameter of colding pressing: temperature of colding pressing is 20 DEG C, and pressure of colding pressing is: 0.5kg/mm2, and the time of colding pressing is: 5min.
As the signal of the present embodiment, the present embodiment preferably makes the bonding material layer 30 of positive plate and barrier film face adhesive bond, the Al of negative plate and barrier film
2o
3layer 20 faces contact.
Therefore, adopt the present embodiment technical scheme, because the two sides of the barrier film of the present embodiment is coated with Al in face respectively
2o
3layer 20, bonding material layer 30, barrier film interval is between the sheet of any the two poles of the earth, the high temperature of pole piece can be prevented to be delivered to barrier film substrate layer 10 and to cause barrier film heat shrinkable and cause the positive/negative plate on barrier film both sides contact and cause short circuit, and adopt the present embodiment technical scheme to also help the cutting resistance improving barrier film, anti-heavy impact performance, is conducive to the security performance of the lithium ion battery improving the present embodiment.
In addition, experiment proves, the present embodiment makes Al
2o
3layer 20 faces with negative plate and contacts, can obtain more excellent purpose less than effect, can more be conducive to preventing high temperature be delivered to barrier film substrate layer 10 and affect membrane properties, wall barrier film temperature is too high, more be conducive to the security performance of the lithium ion battery improving the present embodiment, the analysis of experimental data seen below in detail further.
In addition, the present embodiment can also after lithium ion battery changes into, hot pressing and cold pressing treatment are carried out to the lithium ion battery after changing into, make barrier film bonding material layer 30 on one side respectively with it just to the pole piece adhesive bond contacted, the active material layer of this pole piece is bonded to be wrapped in bonding material layer 30, the active material on pole piece now can also be prevented to be scattered, and be conducive to avoiding barrier film heat shrinkable further and causing both positive and negative polarity short circuit and cause potential safety hazard, therefore adopt this technical scheme, be conducive to the short circuit ratio reducing lithium ion battery further, improve the application security of battery.
experimental effect analysis contrasts:
Reference examples 1:
The microporous membrane that barrier film in this lithium ion battery adopts PE layer and PP layer to form, wherein PP layer is positioned at intermediate layer, and PP layer is positioned at two surfaces of PE layer, and the thickness of barrier film is 16 μm.
Lamination process conventionally, adopts above-mentioned barrier film and pole piece to carry out lamination, obtains laminated battery core body, laminated battery core body is carried out aluminum plastic film encapsulation, electrolyte filling, change into, obtain the lithium ion battery of this reference examples.
The specification of the lithium ion battery obtained is: be ASP7042126-S2A.Wherein, AS represents pure cobalt water-base cathode, and 7042126 represent that the thick, wide, long of this polymer Li-ion battery is of a size of 7mm, 42mm, 126mm, and S represents that nominal multiplying power is 20C, and 2 represent that battery is high capacity type, and A represents just very pure cobalt acid lithium.
reference examples 2:
This reference examples lithium ion battery and reference examples 1 difference are only:
The present embodiment adopts the barrier film of the PP+PE+PP three-layer composite structure described in reference examples 1 as barrier film substrate layer, the thickness of its septation substrate layer is 10 μm, a PVDF layer is also coated with on two surfaces of barrier film substrate layer, the thickness of each PVDF layer is respectively 3 μm, and the thickness of this reference examples barrier film is 16 μm.
Wherein, when applying PVDF layer, PVDF powder and solvent are carried out being mixed to get slurry, slurry is coated to membrane surface, dry roll-in, wherein the mass percent of PVDF and solvent is: 15%:85%, and solvent is chosen: 1-METHYLPYRROLIDONE.
After lithium ion battery changes into, also hot-pressing processing is carried out to lithium ion battery, after hot-pressing processing, carry out colding pressing heat treatment immediately.
Wherein hot compression parameters is as follows: hot pressing temperature is: 60 DEG C, and hot pressing pressure is: 0.20kg/mm2, and hot pressing time is: 10min.Cold pressing immediately after hot-pressing, parameter of colding pressing is: temperature of colding pressing is 20 DEG C, and pressure of colding pressing is: 0.5kg/mm2, and the time of colding pressing is: 5min.Positive plate, negative plate are combined respectively at the PVDF layer on the barrier film both sides between them is bonding.
The specification of the lithium ion battery obtained is with reference examples 1.
reference examples 3:
This reference examples lithium ion battery and reference examples 2 differences are only:
The present embodiment adopts the difference of reference examples 2 to be only:
Be PAA layer at the bonding material layer on barrier film substrate layer two surface, the thickness of each PAA layer is with reference examples 2.
Wherein, when applying PAA layer, PAA powder and solvent are carried out being mixed to get slurry, slurry is coated to membrane surface, dry roll-in, wherein the mass percent of PAA and solvent is: 15%:85%, and solvent is chosen: 1-METHYLPYRROLIDONE.
With reference examples 2 in like manner, also hot-pressing processing is carried out after lithium ion battery changes into, carry out colding pressing heat treatment immediately after hot-pressing, hot pressing and the parameter of colding pressing, with reference examples 2, make positive plate, negative plate combine respectively at the PAA layer on the barrier film both sides between them is bonding.
The specification of the lithium ion battery obtained is with reference examples 1.
reference examples 4:
This reference examples lithium ion battery and reference examples 1 difference are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is also coated with Al on two surfaces of barrier film substrate layer
2o
3layer, each Al
2o
3the thickness of layer is respectively 3 μm.
The preparation technology of the lithium ion battery of this reference examples is with reference examples 1, and the specification of the lithium ion battery obtained is with reference examples 1.
Wherein, at coating Al
2o
3during layer, by Al
2o
3powder and solvent carry out being mixed to get slurry, and slurry is coated to membrane surface, dry roll-in, wherein Al
2o
3with the mass percent of solvent be: 30%:70%, solvent is chosen: 1-METHYLPYRROLIDONE.
experimental example 1:
This experimental example lithium ion battery and reference examples 1 difference are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm;
At a surface bonding coating Al of barrier film substrate layer
2o
3layer, has PVDF layer, Al in another surface-coated of barrier film substrate layer
2o
3the coating thickness of layer is 4 μm, and the thickness of PVDF layer is 3 μm.
Wherein, when applying PVDF layer, PVDF powder and solvent are carried out being mixed to get slurry, slurry is coated to membrane surface, dry roll-in, wherein the mass percent of PVDF and solvent is: 15%:85%, and solvent is chosen: 1-METHYLPYRROLIDONE.
At coating Al
2o
3during layer, by Al
2o
3powder and solvent carry out being mixed to get slurry, and slurry is coated to membrane surface, dry roll-in, wherein Al
2o
3with the mass percent of solvent be: 30%:70%, solvent is chosen: 1-METHYLPYRROLIDONE.
Lamination process conventionally, adopts above-mentioned barrier film and pole piece to carry out lamination, the PVDF layer of barrier film and positive plate is faced, makes the Al of barrier film
2o
3layer faces with negative plate and contacts, and obtains laminated battery core body, laminated battery core body is carried out aluminum plastic film encapsulation, electrolyte filling, change into, obtain lithium ion battery.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 2:
This experimental example lithium ion battery and experimental example 1 difference are only:
This experimental example, after lithium ion battery changes into, also carries out hot-pressing processing to lithium ion battery, after hot-pressing processing, carry out colding pressing heat treatment immediately, and positive plate is just combined the bonding formed-knot of PVDF layer contacted with it.
Wherein hot compression parameters is as follows: hot pressing temperature is: 60 DEG C, and hot pressing pressure is: 0.20kg/mm2, and hot pressing time is: 10min.Cold pressing immediately after hot-pressing, parameter of colding pressing is: temperature of colding pressing is 20 DEG C, and pressure of colding pressing is: 0.5kg/mm2, and the time of colding pressing is: 5min.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 3:
This experimental example lithium ion battery and reference examples 2 differences are only:
This experimental example, after lithium ion battery changes into, also carries out hot compression parameters, after hot-pressing cold pressing the immediately parameter of heat treatment of hot pressing to lithium ion battery different:
The hot compression parameters that this experiment adopts is as follows: hot pressing temperature is: 50 DEG C, and hot pressing pressure is: 0.90kg/mm2, and hot pressing time is: 60min;
The parameter of colding pressing of this experimental example is: temperature of colding pressing is 18 DEG C, and pressure of colding pressing is: 0.05kg/mm2, and the time of colding pressing is: 60min.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 4:
This experimental example lithium ion battery and reference examples 2,3 differences are only:
The hot compression parameters that this experiment adopts is as follows: hot pressing temperature is: 80 DEG C, and hot pressing pressure is: 0.50kg/mm2, and hot pressing time is: 20min;
The parameter of colding pressing of this experimental example is: temperature of colding pressing is 23 DEG C, and pressure of colding pressing is: 0.50kg/mm2, and the time of colding pressing is: 20min.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 5:
This experimental example lithium ion battery and reference examples 2,3,4 differences are only:
The hot compression parameters that this experiment adopts is as follows: hot pressing temperature is: 100 DEG C, and hot pressing pressure is: 0.90kg/mm2, and hot pressing time is: 60min;
The parameter of colding pressing of this experimental example is: temperature of colding pressing is 18 DEG C, and pressure of colding pressing is: 0.90kg/mm2, and the time of colding pressing is: 60min.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 6:
This experimental example lithium ion battery and experimental example 2 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, and bonding is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 1 μm, and the thickness being coated in the PVDF layer on another surface of barrier film substrate layer is 2 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 7:
This experimental example lithium ion battery and experimental example 2 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 3 μm, and the PVDF layer thickness being coated in another surface of barrier film substrate layer is 3 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 8:
This experimental example lithium ion battery and experimental example 2 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 5 μm, and the PVDF layer thickness being coated in another surface of barrier film substrate layer is 4 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 9:
This experimental example lithium ion battery and experimental example 2 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 5 μm, and the PVDF layer thickness being coated in another surface of barrier film substrate layer is 5 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 10:
This experimental example lithium ion battery and experimental example 2 differences are only:
Al on the barrier film of this experimental example
2o
3layer, just to positive plate, contacts with positive plate, the PVDF layer on barrier film and negative plate is bonding combines.
The technique of the present embodiment is with experimental example 2, and the specification of the lithium ion battery obtained is with reference examples 1.
experimental example 11:
This experimental example lithium ion battery and reference examples 2 differences are only:
This experimental example has Al in a surface-coated of barrier film substrate layer
2o
3layer, has the non-PVDF layer of PAA layer in another surface-coated of barrier film substrate layer, Al
2o
3the coating thickness of layer is 4 μm, and the thickness of PAA layer is 3 μm.
Wherein, when applying PAA layer, PAA powder and solvent are carried out being mixed to get slurry, slurry is coated to membrane surface, dry roll-in, wherein the mass percent of PAA and solvent is: 15%:85%, and solvent is chosen: 1-METHYLPYRROLIDONE.
At coating Al
2o
3during layer, by Al
2o
3powder and solvent carry out being mixed to get slurry, and slurry is coated to membrane surface, dry roll-in, wherein Al
2o
3with the mass percent of solvent be: 30%:70%, solvent is chosen: 1-METHYLPYRROLIDONE.
The specification of the lithium ion battery obtained is with reference examples 1.
The technique of this experimental example is with experimental example 2.
experimental example 12:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 1 μm, and the thickness being coated in the PAA layer on another surface of barrier film substrate layer is 2 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 13:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 3 μm, and the PAA layer thickness being coated in another surface of barrier film substrate layer is 3 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 14:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 5 μm, and the PAA layer thickness being coated in another surface of barrier film substrate layer is 4 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 15:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 5 μm, and the PAA layer thickness being coated in another surface of barrier film substrate layer is 5 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 16:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 5 μm, and the PAA layer thickness being coated in another surface of barrier film substrate layer is 5 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 17:
This experimental example lithium ion battery and experimental example 11 differences are only:
The present embodiment adopts the barrier film of reference examples 1 as barrier film substrate layer, and the thickness of its septation substrate layer is 10 μm, is coated in the Al on a surface of barrier film substrate layer
2o
3the thickness of layer is 1 μm, and the PAA layer thickness being coated in another surface of barrier film substrate layer is 2 μm.
The specification of the lithium ion battery obtained is with reference examples 1.
experimental example 18:
This experimental example lithium ion battery and experimental example 10 differences are only:
Al on the barrier film of this experimental example
2o
3layer, just to positive plate, contacts with positive plate, the PAA layer on barrier film and negative plate is bonding combines.
The technique of the present embodiment is with experimental example 10, and the specification of the lithium ion battery obtained is with reference examples 1.
experimental example 19:
This experimental example lithium ion battery and experimental example 1-18 institute difference are only:
This experimental example is after obtaining lamination lithium-ion electric core body, hot-pressing processing is carried out to lithium-ion electric core body, after hot-pressing processing, carry out colding pressing heat treatment immediately, after heat treatment of colding pressing, just carry out aluminum plastic film encapsulation and electrolyte filling and lithium ion battery chemical synthesis technology.
The parameter of hot pressing and heat treatment of colding pressing, with experimental example 2, makes the positive plate in battery core body just combine to the polyvinylidene fluoride layer contacted is bonding with it.
The specification of the lithium ion battery obtained is with reference examples 1.
Get lithium ion battery sample 10 samples as battery of tests of above-mentioned reference examples 1-4 and experimental example 1-19 respectively at random, the regulation of GB GB18287-2013 respectively, carry out following group of experiment: volume test, cycle life, short circuit maximum temperature, overcharge temperature, anti-heavy impact and heat abuse, after obtaining experimental result, experimental result is averaged, obtains the Experimental comparison's data shown in following table:
Table one: Experimental comparison's tables of data
| Project | Average size ,/mah | Cycle life ,/time | Short circuit maximum temperature/DEG C | Overcharge temperature/DEG C | Heavy impact/DEG C | Heat abuse |
| Reference examples 1 | 2060 | 543 | 217 | 194 | On fire | On fire |
| Reference examples 2 | 2045 | 558 | 198 | On fire | On fire | On fire |
| Reference examples 3 | 2053 | 571 | 203 | On fire | On fire | On fire |
| Reference examples 4 | 2066 | 502 | 114 | 128 | 113 | Pass through |
| Experimental example 1 | 2078 | 432 | 108 | 114 | 128 | Pass through |
| Experimental example 2 | 2098 | 847 | 71 | 68 | 104 | Pass through |
| Experimental example 3 | 2063 | 628 | 101 | 116 | 121 | Pass through |
| Experimental example 4 | 2043 | 425 | 147 | 138 | 174 | Pass through |
| Experimental example 5 | 1993 | 406 | On fire | 125 | On fire | Pass through |
| Experimental example 6 | 2034 | 497 | 188 | On fire | 206 | Pass through |
| Experimental example 7 | 2059 | 527 | 117 | 129 | 112 | Pass through |
| Experimental example 8 | 2042 | 514 | 112 | 81 | 114 | Pass through |
| Experimental example 9 | 2058 | 506 | 87 | 93 | 114 | Pass through |
| Reference examples 10 | 2067 | 579 | 145 | 178 | 184 | Pass through |
| Experimental example 11 | 2081 | 719 | 73 | 75 | 106 | Pass through |
| Experimental example 12 | 2066 | 497 | 172 | 160 | On fire | Pass through |
| Experimental example 13 | 2065 | 563 | 153 | 148 | 119 | Pass through |
| Experimental example 14 | 2057 | 541 | 86 | 119 | 75 | Pass through |
| Experimental example 15 | 2061 | 511 | 95 | 126 | 104 | Pass through |
| Experimental example 16 | 2035 | 515 | 103 | 118 | 73 | Pass through |
| Experimental example 17 | 2034 | 613 | 116 | 107 | 81 | Pass through |
| Experimental example 18 | 2037 | 579 | 145 | 178 | 184 | Pass through |
| Experimental example 19 | 2015 | 468 | 138 | 124 | 131 | Pass through |
From upper table one, the experimental data of contrast reference examples 1-4 and experimental example 1-19 is visible, adopts the present embodiment at the one side coating Al of barrier film
2o
3layer, the technical scheme of another side adhesive material layer, the heat resistance of battery can be improved, what for example avoid under heat abuse situation is on fire, greatly reduce the on fire probability of battery when heavy impact, and greatly reduce the short circuit maximum temperature of battery and overcharge temperature, avoiding on fire, being conducive to the security performance improving battery.
Control experiment example 1, with experimental example 2 visible, adopt same membrane configuration, hot pressing and heat treatment of colding pressing also is carried out after Battery formation, greatly can also improve capacity, the heat resistance of battery, for example (,) avoid heat abuse situation under on fire, greatly reduce the on fire probability of battery when heavy impact, and greatly reduce the short circuit maximum temperature of battery and overcharge temperature, avoid on fire, be conducive to the security performance improving battery, it can obtain beyond thought effect relative to prior art.
Control experiment example 2 is visible with experimental example 3-5, adopt the hot pressing described in experimental example 2 and cold-press process, no matter be all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharge in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Control experiment example 2 is visible with experimental example 6-9, adopts the Al shown in test example 2
2o
3no matter layer and the coating thickness of PDVF layer are all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharges in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Control experiment example 2 is visible with experimental example 10, on membrane configuration, the just the same basis of battery preparation technique, makes PDVF layer and positive plate just to bonding, Al
2o
3layer with negative plate just to contacting, no matter be all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharge in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Control experiment example 11 is visible with experimental example 12-17, in preparation technology and battery structure same basic, adopt the membrane thicknesses shown in experimental example 11, no matter be all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharge in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Control experiment example 11 is visible with experimental example 18, on membrane configuration and thickness and the identical basis of preparation technology, as shown in experimental example 11, makes PAA layer and positive plate just to bonding, Al
2o
3layer with negative plate just to contacting, no matter be all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharge in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Control experiment example 11 is visible with experimental example 19, hot pressing and heat treatment of colding pressing also is carried out after Battery formation, greatly can also improve capacity, the heat resistance of battery, what for example avoid under heat abuse situation is on fire, greatly reduce the on fire probability of battery when heavy impact, and greatly reduce the short circuit maximum temperature of battery and overcharge temperature, avoid on fire, be conducive to the security performance improving battery, it can obtain beyond thought effect relative to prior art.
Control experiment example 2 is visible with experimental example 11, adopt the barrier film energy shown in experimental example 2, no matter be all can obtain beyond thought effect in battery capacity, useful life, anti-heavy impact, heat resistance, and it overcharge in temperature, heavy impact temperature, short circuit temperature in reduction and also can obtain beyond thought effect.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (10)
1. a lithium-ion electric core body, is characterized in that, comprises the first pole piece, barrier film, the second pole piece, is interposed between described first pole piece, the second pole piece between described barrier film,
Described barrier film comprises barrier film substrate layer, also applies be bonded with nano level alundum (Al2O3) layer at the end face of described barrier film substrate layer, described alundum (Al2O3) layer and described first pole piece just to contacting,
Be covered with bonding material layer in the coated on bottom side of described barrier film substrate layer, described bonding material layer and described second pole piece are just to contacting.
2. lithium-ion electric core body according to claim 1, is characterized in that,
Described first pole piece is negative plate, and described second pole piece is positive plate.
3. lithium-ion electric core body according to claim 1, is characterized in that,
The thickness of described alundum (Al2O3) layer is 0.1 μm ~ 5 μm.
4. lithium-ion electric core body according to claim 3, is characterized in that,
The thickness of described alundum (Al2O3) layer is 4 μm.
5. lithium-ion electric core body according to claim 1, is characterized in that,
The thickness of described bonding material layer is 0.1 μm ~ 5 μm.
6. lithium-ion electric core body according to claim 5, is characterized in that,
The thickness of described bonding material layer is 3 μm.
7. lithium-ion electric core body according to claim 1, is characterized in that,
The thickness of described barrier film substrate layer is 9 μm ~ 40 μm.
8. lithium-ion electric core body according to claim 7, is characterized in that,
The thickness of described barrier film substrate layer is 10 μm.
9. lithium-ion electric core body according to claim 1, is characterized in that,
The granularity of described alundum (Al2O3) is 10nm ~ 100nm.
10. lithium-ion electric core body according to claim 9, is characterized in that,
The granularity of described alundum (Al2O3) is 10nm ~ 30nm.
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| CN106207059A (en) * | 2016-08-12 | 2016-12-07 | 联想(北京)有限公司 | A kind of lithium ion battery separator, its preparation method and application |
| CN107275552A (en) * | 2017-05-19 | 2017-10-20 | 深圳瑞隆新能源科技有限公司 | A kind of lithium ion battery double-sided adhesive barrier film and lithium ion battery |
| CN111769253A (en) * | 2020-06-29 | 2020-10-13 | 天津力神电池股份有限公司 | A kind of battery positive electrode sheet, flexible packaging lithium carbon fluoride primary battery and preparation method thereof |
| CN112787037A (en) * | 2021-02-01 | 2021-05-11 | 合肥国轩高科动力能源有限公司 | Manufacturing method of high-performance safe soft package lithium ion battery |
| CN112909428A (en) * | 2021-01-26 | 2021-06-04 | 南京捷纳思新材料有限公司 | Battery diaphragm and preparation method thereof |
| WO2024082088A1 (en) * | 2022-10-17 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
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| WO2024082088A1 (en) * | 2022-10-17 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
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Application publication date: 20151111 |