CN110048167A - A kind of preparation method of high resistant water resistance oxygen high temperature resistant battery core - Google Patents
A kind of preparation method of high resistant water resistance oxygen high temperature resistant battery core Download PDFInfo
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- CN110048167A CN110048167A CN201910301015.4A CN201910301015A CN110048167A CN 110048167 A CN110048167 A CN 110048167A CN 201910301015 A CN201910301015 A CN 201910301015A CN 110048167 A CN110048167 A CN 110048167A
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- insulating film
- film
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- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000001301 oxygen Substances 0.000 title claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 82
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 82
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000004913 activation Effects 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 72
- 239000010410 layer Substances 0.000 claims description 35
- 239000003292 glue Substances 0.000 claims description 14
- 239000004831 Hot glue Substances 0.000 claims description 11
- 229920002799 BoPET Polymers 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 9
- 238000005253 cladding Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000009736 wetting Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical group C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000003522 acrylic cement Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000005030 aluminium foil Substances 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 239000006188 syrup Substances 0.000 description 4
- 235000020357 syrup Nutrition 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 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
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/1245—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the external coating on the casing
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a kind of preparation methods of high resistant water resistance oxygen high temperature resistant battery core, belong to lithium ion battery preparation field.One layer of Al is coated on battery core surface2O3/ PET/CPP insulating film, the Al2O3/ PET/CPP insulating film is by Al2O3, PET and CPP composition, this layer of insulating film, which can be played effectively, to block water, hinders oxygen and function resistant to high temperature, passes through Al2O3The coating function of/PET/CPP insulating film, make the core being prepared after heat-sealing, the control of ambient humidity is required to decrease in back segment charging, activation procedure, it can be carried out under the conditions of general ambient temperature and moisture, the consumption for greatly reducing the energy during battery core preparation section, reduces the manufacturing cost of power battery.And due to Al2O3/ PET/CPP insulating film outer layer is Al2O3Layer, Al2O3There is layer good high temperature resistance to promote the service life and security performance of power battery so that the battery core being prepared remains to work normally in higher temperature.
Description
Technical field
The invention belongs to lithium ion battery preparation fields, and in particular to a kind of preparation side of high resistant water resistance oxygen high temperature resistant battery core
Method.
Background technique
With the fast development in new-energy automobile field, development that lithium-ion-power cell is also advanced by leaps and bounds.I
Know that main raw material(s) used in lithium ion battery such as anode LFP/NCM, electrolyte moisture are extremely sensitive, lithium ion thus
Power battery is especially high to the humid control requirement of environment during the manufacturing, and battery manufacture whole process is all in low humidity
(RH≤40%) is carried out under the conditions of degree.Especially since battery core injects electrolyte, to ensure battery performance, the institute that fluid injection starts
There is process that must carry out in the environment of dew point≤- 40 DEG C.The lithium-ion-power cell that the environmental Kuznets Curves of high standard are is manufacturing
It is higher to the fringe cost of energy consumption in the process, while the influence that the quality of environmental Kuznets Curves generates performance of lithium ion battery is non-
Chang Ju great is a problem urgently to be resolved so how to minimize influence of the environmental factor to lithium-ion-power cell.
Meanwhile with the raising that user requires vehicle course continuation mileage, vehicle is to lithium-ion-power cell energy density
It is required that higher and higher.The lithium-ion-power cell for the LFP-C system that the country several years ago generally uses slightly aobvious power in energy density
Not from the heart, the domestic power battery manufacturer headed by CATL turns to the production of NCM-C and NCM-SIC system battery one after another.But
It is it is well known that NCM (especially nickelic system) is without LFP safety, thus in progress NCM system lithium-ion-power cell production
It manufactures and is necessary in application, improving the high temperature resistance of battery core to improve its security performance.
Summary of the invention
Above-mentioned to solve the problems, such as, the object of the present invention is to provide a kind of preparations of high resistant water resistance oxygen high temperature resistant battery core
Method.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of preparation method of high resistant water resistance oxygen high temperature resistant battery core, comprising the following steps:
(1) anode pole piece, diaphragm, cathode pole piece are prepared by core by winding or lamination process；It will be single in core
Positive pole ear and negative lug be ultrasonically welded in positive strap and negative straps respectively, the positive strap and negative
Pole connection sheet surface is coated with hot melt adhesive layer；
(2) in the symmetrically placed Al in the top and bottom of core2O3/ PET/CPP insulating film, the Al2O3/ PET/CPP insulation
The CPP layer of film is contacted with core inwardly, Al2O3Layer is emerging in outside；The Al2O3/ PET/CPP insulating film can coat core
Entire area, and Al2O3The length of/PET/CPP insulating film is greater than the length of core；
(3) to Al2O3Top margin, bottom edge and the first side of/PET/CPP insulating film are sealed, and the heat-sealing position on this three side
It sets close to core edge, heat-sealing temperature is 160-190 DEG C；The Al2O3The heat-sealing position of the top margin of/PET/CPP insulating film with just
Hot melt adhesive layer alignment in pole connection sheet and negative straps；
(4) core, which is placed in 70-90 DEG C of temperature, vacuumizes baking water removal, in -60~-40 DEG C of environment after being cooled to room temperature
Middle injection electrolyte；
(5) 16-24h is stood, after liquid complete wetting core to be electrolysed, to Al in -60~-40 DEG C of environment2O3/PET/CPP
The second side of insulating film is sealed, and far from core, heat-sealing temperature is 160-190 DEG C for the heat-sealing position of second side；
(6) electricizing activation is carried out to core in the environment of ambient temperature and moisture；
(7) after the core vacuumizing and exhausting after electricizing activation, to Al2O3/ PET/CPP insulating film carries out shaping heat-sealing, described
Shaping hot edge seal is located at Al2O3The middle part of/PET/CPP insulating film and close core edge, cut off extra Al2O3/ PET/CPP is exhausted
Velum obtains Al2O3The battery core of/PET/CPP insulating film cladding；
(8) by Al2O3The battery core of/PET/CPP insulating film cladding enters shell assembled formation.
Further scheme, the distance between heat-sealing position and the heat-sealing position of first side of the second side are core
2-3 times of length, it is therefore an objective in two layers of Al2O3Generation when reserving the chemical conversion of enough space battery cores in/PET/CPP insulating film
Gas.
Further scheme, the Al2O3/ PET/CPP insulating film is prepared by the following method to obtain:
(1) first that CPP film is compound on a pet film, obtain PET/CPP film；The CPP film thickness is 60-100 μm, PET
Film thickness is 10-20 μm；It is further preferred that the complex method of the CPP film and PET film is that coating adhesive means or melting are squeezed
Thermal-adhering mode out；
(2) by Al2O3Slurry is coated in the pet layer surface in PET/CPP film and forms Al2O3Layer, obtains Al2O3/PET/CPP
Insulating film.
Further scheme, the Al2O3Slurry is by Al2O3Powder, binder, water are mixed with to obtain, Al2O3The thickness of layer
It is 2-3 μm.
Further scheme, the binder are butadiene-styrene rubber class binder or polyacrylic binder.
Further scheme, hot melt adhesive layer is PP glue or MODIFIED PP glue etc. in the step (1).
Further scheme, the coating positional distance positive strap of hot melt adhesive layer or negative straps in the step (1)
The distance of top margin be the 1/2-1/3 of positive strap or negative straps width, the length of hot melt adhesive layer and positive strap or
The equal length of negative straps, hot melt adhesive layer with a thickness of 100-500 μm.
Compared with prior art, the invention has the benefit that
A kind of preparation method of high resistant water resistance oxygen high temperature resistant battery core provided by the invention coats one layer on battery core surface
Al2O3/ PET/CPP insulating film, this layer of insulating film, which can be played effectively, to block water, hinders oxygen and function resistant to high temperature, passes through Al2O3/
The coating function of PET/CPP insulating film makes the core being prepared after heat-sealing, right in back segment charging, activation procedure
The control of ambient humidity requires to decrease, and can be carried out under the conditions of general ambient temperature and moisture, greatly reduces battery core preparation
The consumption of the energy in process, reduces the manufacturing cost of power battery.And due to Al2O3/ PET/CPP insulating film outer layer is
Al2O3Layer, Al2O3Layer has good high temperature resistance, so that the battery core being prepared remains to normal work in higher temperature
Make, promotes the service life and security performance of power battery.
Detailed description of the invention
Fig. 1 is Al2O3/ PET/CPP insulating film seals schematic diagram；
Appended drawing reference: 1- core, 11- positive strap, 12- negative straps, 2-Al2O3/ PET/CPP insulating film, 3-PP
Glue, the first side 21-, 22- top margin, the bottom edge 23-, the second side 24-, 25- shaping hot edge seal, 4- seal position.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further explained.Obviously, described embodiment is this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment 1 is coated with adhesive means and prepares Al2O3/ PET/CPP insulating film
(1) glue is uniformly coated on PET film surface with gravure coater, realizes the adherency between CPP film and PET film
PET/CPP film is made, wherein CPP film thickness is 60 μm, and PET film is with a thickness of 10 μm；
(2) by Al2O3Powder, butadiene-styrene rubber class binder, water are mixed according to mass percent 49:0.5:50, are then passed through
The Al of high speed disperser preparation stable homogeneous2O3Slurry, using gravure coater by Al2O3Slurry is coated uniformly on PET/CPP
The pet layer surface of film, Al2O3Coating layer thickness is prepared at 3 μm and blocks water, hinders oxygen and Al resistant to high temperature2O3/ PET/CPP insulation
Film.
2 melting extrusion thermal-adhering mode of embodiment prepares Al2O3/ PET/CPP insulating film
(1) CPP particle is melted using hot extrusion equipment under 180 DEG C of hot conditions, is processed into thickness by squeezing out to get to know
The film that degree is 70 μm, CPP film squeeze out width and PET film with wide；The CPP film and PET film of extrusion are answered a pager's call by heat realizes the two
It is compound, for PET film with a thickness of 20 μm, PET/CPP film is prepared at 150 DEG C in the control of hot rewarming degree；
(2) by Al2O3Powder, polyacrylic binder, water are mixed according to mass percent 49:0.5:50, are then passed through
The Al of high speed disperser preparation stable homogeneous2O3Slurry, using gravure coater by Al2O3Slurry is coated uniformly on PET/CPP
The pet layer surface of film, Al2O3Coating layer thickness is prepared at 2 μm and blocks water, hinders oxygen and Al resistant to high temperature2O3/ PET/CPP insulation
Film.
The preparation of 3 high resistant water resistance oxygen high temperature resistant battery core of embodiment
(1) viscous syrup containing positive active material is coated on aluminium foil and is dried, positive pole is made in laser film-making
Piece, using aluminium foil as positive pole ear；Viscous syrup containing negative electrode active material is coated on copper foil, drying, laser film-making,
Cathode pole piece is made, using copper foil as negative lug；Volume is made in anode pole piece, diaphragm, cathode pole piece by way of lamination
Core 1；As shown in Figure 1, positive pole ear and negative lug single in core are ultrasonically welded within positive strap 11 respectively and born
In pole connection sheet 12, the surface of the positive strap 11 and negative straps 12 is coated with PP glue 3, the coating of the PP glue 3
The distance of positional distance positive strap or negative straps top margin is the 1/3, PP of positive strap or negative straps width
The equal length of the length of glue 3 and positive strap or negative straps, PP glue 3 with a thickness of 500 μm.
(2) in the symmetrically placed Al being prepared by embodiment 1 in the top and bottom of core2O3/ PET/CPP insulating film 2,
The Al2O3The CPP layer of/PET/CPP insulating film 2 is contacted with core inwardly, Al2O3Layer is emerging in outside；The Al2O3/PET/
CPP insulating film can coat core entire area, and Al2O3The length of/PET/CPP insulating film is 2.5 times of core length.
(3) to Al2O3Top margin 22, bottom edge 23 and the first side 21 of/PET/CPP insulating film are sealed, and this three side
Position 4 is sealed close to core edge, heat-sealing temperature is 190 DEG C, while ensuring that insulating film merges completely up and down on three sides sealed
Together without gap, the Al2O3On the heat-sealing position of the top margin of/PET/CPP insulating film and positive strap and negative straps
PP glue 3 be aligned；
(4) core, which is placed in 80 DEG C of temperature, vacuumizes baking water removal, injects electricity after being cooled to room temperature in -60 DEG C of environment
Solve liquid；
(5) it stands for 24 hours, after liquid complete wetting core to be electrolysed, to Al in -60 DEG C of environment2O3/ PET/CPP insulating film
Second side 24 is sealed, and heat-sealing temperature is 190 DEG C, between the position of second side heat-sealing and the position of first side heat-sealing
Distance be 2 times of core length, thus in two layers of Al2O3Enough space battery cores are reserved in/PET/CPP insulating film
At when the gas that generates；
(6) electricizing activation is carried out to core in the environment of ambient temperature and moisture；
(7) after the core vacuumizing and exhausting after electricizing activation, to Al2O3/ PET/CPP insulating film carries out shaping heat-sealing, described
Shaping hot edge seal 25 is located at Al2O3The middle part of/PET/CPP insulating film and close core edge, cut off extra Al2O3/PET/CPP
Insulating film obtains Al2O3The battery core of/PET/CPP insulating film cladding；
(8) by Al2O3The battery core of/PET/CPP insulating film cladding enters shell assembled formation.
The preparation of 4 high resistant water resistance oxygen high temperature resistant battery core of embodiment
(1) viscous syrup containing positive active material is coated on aluminium foil and is dried, positive pole is made in laser film-making
Piece, using aluminium foil as positive pole ear；Viscous syrup containing negative electrode active material is coated on copper foil, drying, laser film-making,
Cathode pole piece is made, using copper foil as negative lug；Volume is made in anode pole piece, diaphragm, cathode pole piece by way of winding
Core 1；Positive pole ear and negative lug single in core are ultrasonically welded within positive strap 11 and negative straps 12 respectively
On, the surface of the positive strap 11 and negative straps 12 is coated with PP glue 3, and the coating positional distance of the PP glue 3 is just
Pole connection sheet or the distance of negative straps top margin be 1/2, the PP glue 3 of positive strap or negative straps width length with
The equal length of positive strap or negative straps, PP glue 3 with a thickness of 100 μm.
(2) in the symmetrically placed Al being prepared by embodiment 2 in the top and bottom of core2O3/ PET/CPP insulating film 2,
The Al2O3The CPP layer of/PET/CPP insulating film 2 is contacted with core inwardly, Al2O3Layer is emerging in outside；The Al2O3/PET/
CPP insulating film can coat core entire area, and Al2O3The length of/PET/CPP insulating film is 3 times of core length；
(3) to Al2O3Top margin 22, bottom edge 23 and the first side 21 of/PET/CPP insulating film are sealed, and this three side
Position 4 is sealed close to core edge, heat-sealing temperature is 160 DEG C, while ensuring that insulating film merges completely up and down on three sides sealed
Together without gap, the Al2O3On the heat-sealing position of the top margin of/PET/CPP insulating film and positive strap and negative straps
PP glue 3 be aligned；
(4) core, which is placed in 80 DEG C of temperature, vacuumizes baking water removal, injects electricity after being cooled to room temperature in -40 DEG C of environment
Solve liquid；
(5) 16h is stood, after liquid complete wetting core to be electrolysed, to Al in -40 DEG C of environment2O3/ PET/CPP insulating film
Second side 24 is sealed, and heat-sealing temperature is 160 DEG C, between the position of second side heat-sealing and the position of first side heat-sealing
Distance be 2.5 times of core length, i.e. the position that seals of second side 24 is far from core, thus in two layers of Al2O3/PET/CPP
The gas generated when the chemical conversion of enough space battery cores is reserved in insulating film；
(6) electricizing activation is carried out to core in the environment of ambient temperature and moisture；
(7) after the core vacuumizing and exhausting after electricizing activation, to Al2O3/ PET/CPP insulating film carries out shaping heat-sealing, described
Shaping hot edge seal 25 is located at Al2O3The middle part of/PET/CPP insulating film and close core edge, cut off extra Al2O3/PET/CPP
Insulating film obtains Al2O3The battery core of/PET/CPP insulating film cladding；
(8) by Al2O3The battery core of/PET/CPP insulating film cladding enters shell assembled formation.
Claims (8)
1. a kind of preparation method of high resistant water resistance oxygen high temperature resistant battery core, it is characterised in that: the following steps are included:
(1) anode pole piece, diaphragm, cathode pole piece are prepared by core by winding or lamination process；By in core it is single just
Pole tab and negative lug are respectively welded in positive strap and negative straps, the positive strap and negative straps
Surface be coated with hot melt adhesive layer；
(2) in the symmetrically placed Al in the top and bottom of core2O3/ PET/CPP insulating film, the Al2O3/ PET/CPP insulating film
CPP layers contact with core inwardly, Al2O3Layer is emerging in outside；The Al2O3/ PET/CPP insulating film can coat core whole
Area, and Al2O3The length of/PET/CPP insulating film is greater than the length of core；
(3) to Al2O3Top margin, bottom edge and the first side of/PET/CPP insulating film are sealed, and the heat-sealing position patch on this three side
Nearly core edge, heat-sealing temperature are 160-190 DEG C；The Al2O3The heat-sealing position of the top margin of/PET/CPP insulating film and anode are even
Hot melt adhesive layer alignment in contact pin and negative straps；
(4) core, which is placed in 70-90 DEG C of temperature, vacuumizes baking water removal, infuses in -60~-40 DEG C of environment after being cooled to room temperature
Enter electrolyte；
(5) 16-24h is stood, after liquid complete wetting core to be electrolysed, to Al in -60~-40 DEG C of environment2O3/ PET/CPP insulation
The second side of film is sealed, and far from core, heat-sealing temperature is 160-190 DEG C for the heat-sealing position of second side；
(6) electricizing activation is carried out to core in the environment of ambient temperature and moisture；
(7) after the core vacuumizing and exhausting after electricizing activation, to Al2O3/ PET/CPP insulating film carries out shaping heat-sealing, the shaping
Hot edge seal is located at Al2O3The middle part of/PET/CPP insulating film and close core edge, cut off extra Al2O3/ PET/CPP insulating film,
Obtain Al2O3The battery core of/PET/CPP insulating film cladding；
(8) by Al2O3The battery core of/PET/CPP insulating film cladding enters shell assembled formation.
2. preparation method according to claim 1, it is characterised in that: the heat-sealing position of the second side and first side
Heat-sealing the distance between position be 2-3 times of core length.
3. preparation method according to claim 1, it is characterised in that: the Al2O3/ PET/CPP insulating film passes through with lower section
Method is prepared:
(1) first that CPP film is compound on a pet film, obtain PET/CPP film；The CPP film thickness is 60-100 μm, and PET film is thick
Degree is 10-20 μm；
(2) by Al2O3Slurry is coated in the pet layer surface in PET/CPP film and forms Al2O3Layer, obtains Al2O3/ PET/CPP insulation
Film.
4. preparation method according to claim 3, it is characterised in that: CPP film and PET film is compound in the step (1)
Mode is coating adhesive means or melting extrusion thermal-adhering mode.
5. preparation method according to claim 3, it is characterised in that: the Al2O3Slurry is by Al2O3Powder, binder, water
It is mixed with to obtain, Al2O3Layer with a thickness of 2-3 μm.
6. preparation method according to claim 5, it is characterised in that: the binder is butadiene-styrene rubber class binder or gathers
Acrylic adhesive.
7. preparation method according to claim 1, it is characterised in that: hot melt adhesive layer is PP glue in the step (1).
8. preparation method according to claim 1, it is characterised in that: the coating position of hot melt adhesive layer in the step (1)
It is the 1/2-1/3 of positive strap or negative straps width, heat apart from the distance of positive strap or negative straps top margin
The equal length of the length of melt layer and positive strap or negative straps, hot melt adhesive layer with a thickness of 100-500 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910301015.4A CN110048167B (en) | 2019-04-15 | 2019-04-15 | Preparation method of high-water-resistance, oxygen-resistance and high-temperature-resistance battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910301015.4A CN110048167B (en) | 2019-04-15 | 2019-04-15 | Preparation method of high-water-resistance, oxygen-resistance and high-temperature-resistance battery cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110048167A true CN110048167A (en) | 2019-07-23 |
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| CN112234259A (en) * | 2020-01-06 | 2021-01-15 | 蜂巢能源科技有限公司 | Battery cell manufacturing method and lithium ion battery |
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