CN110518249A - A kind of battery core pole piece and obtained battery core is assembled by it - Google Patents
A kind of battery core pole piece and obtained battery core is assembled by it Download PDFInfo
- Publication number
- CN110518249A CN110518249A CN201910848534.2A CN201910848534A CN110518249A CN 110518249 A CN110518249 A CN 110518249A CN 201910848534 A CN201910848534 A CN 201910848534A CN 110518249 A CN110518249 A CN 110518249A
- Authority
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- China
- Prior art keywords
- battery core
- pole piece
- safe floor
- combination
- particle
- Prior art date
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- 239000002245 particle Substances 0.000 claims description 41
- -1 polyethylene terephthalate Polymers 0.000 claims description 22
- 239000011810 insulating material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 11
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 10
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000004697 Polyetherimide Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 5
- 229920001601 polyetherimide Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 3
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910001935 vanadium oxide Inorganic materials 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 229910002706 AlOOH Inorganic materials 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- OCKPCBLVNKHBMX-UHFFFAOYSA-N butylbenzene Chemical compound CCCCC1=CC=CC=C1 OCKPCBLVNKHBMX-UHFFFAOYSA-N 0.000 claims 2
- 229920001971 elastomer Polymers 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 7
- 239000011162 core material Substances 0.000 description 73
- 238000000576 coating method Methods 0.000 description 20
- 239000011248 coating agent Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 15
- 238000005259 measurement Methods 0.000 description 9
- 238000002955 isolation Methods 0.000 description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000005030 aluminium foil Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000011267 electrode slurry Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910006636 γ-AlOOH Inorganic materials 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
- H01M10/052—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
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Obtained battery core is assembled the present invention relates to a kind of battery core pole piece and by it, the battery core pole piece includes collector, electrode diaphragm and safe floor, and the resistivity of the safe floor is 1 × 10‑4M~1 × 10 Ω4Ω m, battery core pole piece of the present invention is provided with safe floor, the setting of the safe floor is on the one hand, since safe floor has certain electric conductivity, when there is pole piece burrs on edges to pierce through diaphragm, burr can fall in safe layer surface, to form faint self discharge, have so similar defect battery core can the pressure drop according to caused by the self discharge of battery core screen, defect battery core stream is avoided to drain to market, on the other hand, the safe floor is due to there is certain resistance, when burr pierces through diaphragm and falls on safe layer surface, also it is too big to be unlikely to short circuit current, and cause thermal runaway, improve its safety.
Description
Technical field
The invention belongs to core material field, it is related to a kind of battery core pole piece and obtained battery core is assembled by it.
Background technique
Continuous promotion with the continuous universal and electric car of electric car to course continuation mileage demand, lithium ion power
The energy density of battery becomes high；Electrodes of lithium-ion batteries in process, the presence that pole piece edge would generally be jagged,
And according to current techniques, burr can not 100% full inspection, be only capable of inspecting by random samples；In order to promote energy density, what lithium ion battery used
Isolation film is more and more thinner, and this adds increased pole piece burrs on edges to pierce through the risk that diaphragm causes battery core internal short-circuit.
CN205921033U discloses a kind of battery and battery core pole piece, and wherein battery core pole piece includes flaky collector,
Active substance is respectively coated in the both side surface of collector, wherein a side surface of collector is welded with tab, the position of tab
It is not coated with active material, and the end of another side surface of collector is exposed, due to the burr of the collector of electrode plates
Can not 100% full inspection, there are the risks of biggish internal short-circuit for the inside battery that this scheme is prepared, and are to avoid above-mentioned wind
Dangerous, the thickness of isolation film cannot be too thin in battery, so that lower by the energy density of its battery being prepared.
Although above-mentioned document discloses some battery core pole pieces and preparation method thereof, but there are still collectors in battery core pole piece
Burr isolation film is damaged, to influence the safe handling of battery core, the energy density for the battery core that Ji Youqi is prepared
Therefore low problem develops a kind of safe floor soft, low in cost and small difficulty of processing, to solve inside battery core
The problem of short circuit is still of great significance.
Summary of the invention
Obtained battery core is assembled the purpose of the present invention is to provide a kind of battery core pole piece and by it, the battery core pole piece includes
Collector, electrode diaphragm and safe floor, the resistivity of the safe floor are 1 × 10-4M~1 × 10 Ω4Ω m, institute of the present invention
State battery core pole piece and be provided with safe floor, the setting of the safe floor on the one hand, since safe floor has certain electric conductivity, when having
When pole piece burrs on edges pierces through diaphragm, burr can fall in safe layer surface, to form faint self discharge, there is similar defect in this way
Battery core can the pressure drop according to caused by the self discharge of battery core screen, avoid defect battery core stream from draining to market, on the other hand,
The safe floor, when burr pierces through diaphragm and falls on safe layer surface, is also unlikely to short circuit current too due to there is certain resistance
Greatly, cause thermal runaway, improve its safety.
In order to achieve that object of the invention, the invention adopts the following technical scheme:
In a first aspect, the battery core pole piece includes collector, electrode diaphragm and peace the present invention provides a kind of battery core pole piece
Holostrome；The resistivity of the safe floor is 1 × 10-4M~1 × 10 Ω4Ω m, such as 2 × 10-4Ω·m、5×10-4Ω·
m、1×10-3Ω·m、5×10-3Ω·m、1×10-2Ω·m、5×10-2Ω·m、1×10-1Ω·m、1Ω·m、5Ω·
m、1×10Ω·m、1×102Ω m or 1 × 103Ω m etc..
Safe floor is provided in battery core pole piece of the present invention, the resistivity of the safe floor is 1 × 10-4M~1 Ω ×
104Ω m has certain electric conductivity, and when the burr of pole piece pierces through diaphragm, burr falls in safe layer surface, thus shape
At faint self discharge, can be screened later by pressure drop caused by self discharge, so that defect battery core is avoided to come into the market,
Meanwhile the setting of safe floor can be reduced destruction of the burr on collector to isolation film, to avoid that battery core internal short-circuit occurs
Risk, simultaneously as the safe floor has certain resistance value, after battery short circuit occurs for burr magnetic sheet diaphragm, so that short
Road electric current is smaller, avoids the generation of thermal failure phenomenon, further increases the safety of battery.
Preferably, the resistivity of the safe floor is 1 × 10-1M~1 × 10 Ω2Ω m, such as 0.1 Ω m, 0.3
Ω m, 0.5 Ω m, 0.7 Ω m, 0.9 Ω m, 1.2 Ω m, 10 Ω m or 100 Ω m etc..
Preferably, the electrode diaphragm contains active material.
Preferably, the active material includes positive electrode active materials or negative electrode active material.
Preferably, the positive electrode active materials include nickle cobalt lithium manganate (NCM), nickel cobalt lithium acid lithium (NCA), LiFePO4 or
Any one in LiMn2O4.
Preferably, the negative electrode active material includes the mixture or any one in lithium titanate of graphite, SiO and graphite
Kind.
Preferably, the electrode diaphragm is located at the surface of collector.
Preferably, the safe floor is located at the surface of collector, the surface of electrode diaphragm or collector and electrode diaphragm
In the surface of intersection any one or at least two combination.
Preferably, the safe floor is located at the edge of collector.
Preferably, the safe floor is located at the surface of collector, the surface of electrode diaphragm and collector and electrode diaphragm
The surface of intersection.
Preferably, the safe floor is located at the region not covered by electrode diaphragm on collector.
Preferably, the safe floor is located at the single side surface or double-sided surface of collector.
Preferably, the combination comprising insulating materials and conductive material in the safe floor and/or ceramic particle and conduction material
The combination of material, specifically includes: the combination of insulating materials and conductive material, the combination or insulation material of ceramic particle and conductive material
The combination of material, ceramic particle and conductive material.
Preferably, the insulating materials includes Kynoar, polyurethane, Sodium Polyacrylate, butadiene-styrene rubber, polyetherimide
Amine, carboxymethyl cellulose, acrylate, polyethylene terephthalate, polybutylene terephthalate, polypropylene or poly- second
In alkene any one or at least two combination, the combination examples include Kynoar and polyurethane combination,
The combination of Sodium Polyacrylate and butadiene-styrene rubber, the combination of polyetherimide and carboxymethyl cellulose, acrylate and poly- to benzene two
The combination or polybutylene terephthalate of formic acid glycol ester, the combination of polypropylene and polyethylene etc..
Preferably, the ceramic particle includes silica, silicon carbide, barium titanate, titanium oxide, vanadium oxide, Al2O3Or γ-
In AlOOH any one or at least two combination, the combination examples include silica and silicon carbide combination,
The combination of barium titanate and titanium oxide, vanadium oxide, Al2O3With the combination of γ-AlOOH etc..
Preferably, the conductive material includes carbon material and/or metal powder.
Preferably, carbon material include in conductive black, graphite or acetylene black any one or at least two combination；Institute
State combination examples includes the combination of conductive black and graphite, the combination of graphite and acetylene black or conductive black and acetylene black
Combination etc..
Preferably, the metal powder include in copper powder, aluminium powder or nickel powder any one or at least two combination, institute
State combination examples includes the combination of copper powder and aluminium powder, the combination of nickel powder and copper powder or aluminium powder and the combination of nickel powder etc..
Preferably, the combination of insulating materials and conductive material and/or ceramic particle and conductive material in the safe floor
Combined mass percentage be 1%-99%, such as 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%,
50%, 60%, 70%, 80% or 90% etc..
Preferably, the insulating materials includes insulating material particle.
Preferably, the insulating material particle include Kynoar particle, polyurethane particles, Sodium Polyacrylate particle,
Butadiene-styrene rubber particle, polyetherimide particle, carboxymethyl cellulose particle, acrylate particles, polyethylene terephthalate
Any one in ester particle, polybutylene terephthalate particle, PP GRANULES or polyethylene particle or at least two
Combination.
Insulating materials is graininess and/or glue in safe floor of the present invention.
Preferably, the partial size of the insulating material particle is 1-100 μm, such as 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μ
M, 50 μm, 60 μm, 70 μm, 80 μm or 90 μm etc., preferably 1-20 μm.
Preferably, the partial size of the ceramic particle is 1-100 μm, such as 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50
μm, 60 μm, 70 μm, 80 μm or 90 μm etc., preferably 1-20 μm.
The partial size of insulating materials material granule of the present invention and the partial size of ceramic particle are independent selected from 1-100 microns,
The number of plies of insulating material particle and/or ceramic particle is n-layer in the coating, wherein n >=1, such as 2,5,10 or 20 etc., preferably
For n >=2.
Preferably, the safe floor with a thickness of 1-100 μm, such as 2 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μ
M, 60 μm, 70 μm, 80 μm, 90 μm or 95 μm etc., preferably 15-60 μm.
Preferably, the preparation method of the safe floor includes any one in coating, attaching, sputtering or deposition.
Preferably, the safe floor is porous structure.
Preferably, the hole road shape of the porous structure include in round, ellipse or polygon any one or extremely
Few two kinds of combination.
Preferably, the duct of the porous structure is through-hole or half-via.
Second aspect, the present invention provides a kind of battery core, the anode pole piece and/or cathode pole piece of the battery core use such as the
Battery core pole piece described in one side.
Preferably, the battery core is assembled using battery core pole piece as described in relation to the first aspect by the method for winding or lamination
It arrives.
Compared with the existing technology, the invention has the following advantages:
(1) safe floor is set in battery core pole piece of the present invention, and the resistivity of the safe floor is 1 × 10-4M~1 Ω
×104Ω m has certain electric conductivity, and when there is pole piece burrs on edges to pierce through diaphragm, burr can fall in safe floor table
Face has the battery core of similar defect can the screening of the pressure drop according to caused by the self discharge of battery core in this way to form faint self discharge
Out, defect battery core stream is avoided to drain to market, on the other hand, the safe floor due to there is certain resistance, burr pierce through every
When film falls on safe layer surface, it is too big to be also unlikely to short circuit current, and causes thermal runaway, improves its safety；
(2) safe floor is set in battery core pole piece of the present invention, and the safe floor can prevent the burr of collector top edge
Isolation film is pierced through, to reduce the risk of battery core internal short-circuit；
(3) difficulty of processing of the safe floor of battery core pole piece of the present invention is small, low in cost, and soft.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of battery core pole piece described in the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of battery core pole piece described in the embodiment of the present invention 2 (containing tab)；
Fig. 3 is the cycle performance test curve of 4 gained battery core of the embodiment of the present invention 4 and comparative example；
1- electrode diaphragm, 2- safe floor, the area 3- Kong Bo, 4- tab.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.Those skilled in the art should be bright
, the described embodiments are merely helpful in understanding the present invention, should not be regarded as a specific limitation of the invention.
Embodiment 1
Battery core pole piece described in the present embodiment includes anode pole piece and cathode pole piece；
The anode pole piece is prepared by the following method:
(1) anode sizing agent is prepared；Using ternary material (NCM532) as positive electrode active materials, using carbon black as conductive agent,
Using Kynoar as binder, using N-Methyl pyrrolidone (NMP) as solvent, above-mentioned substance is uniformly mixed shape
At anode sizing agent；
(2) Kynoar and N-Methyl pyrrolidone are mixed according to the weight ratio of 1:10, conductive black are added later,
The weight ratio of conductive black and Kynoar is 5:95, obtains the mixed solution of Kynoar and conductive black；
(3) anode sizing agent is coated in the surface of plus plate current-collecting body aluminium foil, forms electrode diaphragm, it later will be in step (2)
Kynoar solution be coated in the position adjacent with electrode diaphragm on plus plate current-collecting body, form safe floor；Its coating method
As shown in Figure 1, being divided into three regions, respectively electrode diaphragm 1, safe floor 2 and the area Kong Bo 3, the safety on the collector
Layer is 2 adjacent with electrode diaphragm 1, and safe floor 2 and the non-conterminous side of electrode diaphragm 1 are the area Kong Bo 3, gained safe floor with a thickness of
40 μm of single side.
(4) the coated product of step (3) is prepared into anode pole piece by drying, roll-in, cross cutting, slitting.
The cathode pole piece is prepared by the following method:
(a) negative electrode slurry is prepared；Using graphite as negative electrode active material, using butadiene-styrene rubber as binder, with distilled water
As solvent, above-mentioned raw materials are uniformly mixed, form negative electrode slurry；
(b) negative electrode slurry is coated on to the two sides of negative current collector copper foil, is prepared into through drying, roll-in, cross cutting, slitting negative
Pole pole piece.
The preparation of battery core: by the above-mentioned anode pole piece being prepared, cathode pole piece and isolation film according to: cathode pole piece-every
From film-anode pole piece-isolation film mode by being rolled into naked battery core, hot pressing later is assembled and is welded on top cover shell
Battery core assembly is completed together, finally, battery core completes battery core production by fluid injection, chemical conversion, exhaust and sealing process.
The resistivity of the coating of the present embodiment anode pole piece is 0.8 Ω m, if cathode burrs on edges pierces through diaphragm, just
It can be in contact with safety coatings, form faint self discharge, cause battery core voltage to decline, in this way before storehouse under battery core when voltage tester
The battery core there are the risk will be found in time, and risk battery core recall rate can be promoted 5% by actual measurement.
Embodiment 2
The present embodiment the difference from embodiment 1 is that, in the preparation process of anode pole piece, the process for forming safe floor passes through
The hybrid conductive carbon black in polyethylene terephthalate (Polyethylene terephthalate, PET), conductive black
Weight ratio with polyethylene terephthalate is 2:98, and the film with a thickness of 20 μm, In is made in its fusion drawn later
The PET adhesive tape that width is 5mm is cut into after the side gluing of film；PET adhesive tape is attached to the edge of plus plate current-collecting body aluminium foil
(tab side) forms safe floor, and other conditions are identical compared with Example 1, and the structure of thus obtained anode pole piece is shown
It is intended to as shown in Fig. 2, the surface of the current collector aluminum foil of the anode pole piece includes electrode diaphragm 1 and safe floor 2, electrode diaphragm 1
It is adjacent with safe floor 2, and the edge of safe floor covering collector, tab 4 is connected to safe floor 2 and electrode diaphragm 1 is non-conterminous
Side.
The resistivity of the safe floor of anode pole piece obtained by the present embodiment is 0.05 Ω m, if cathode burrs on edges pierces through
Diaphragm will be in contact with safety coatings, form faint self discharge, and battery core voltage is caused to decline, electric in this way before storehouse under battery core
The battery core there are the risk will be found when pressure test in time, risk battery core recall rate can be promoted 3% by actual measurement.
Embodiment 3
The present embodiment the difference from embodiment 1 is that, in the preparation process of anode pole piece, the process for forming safe floor passes through
The weight ratio of the incorporation conductive black in polypropylene (polypropylene, PP), conductive black and PP are 1:99, are melted later,
And by the method for spraying, it is sprayed on position adjacent with electrode diaphragm on plus plate current-collecting body aluminium foil, spraying position such as Fig. 1 institute
Show, width 12mm, with a thickness of 10 μm, other conditions are identical compared with Example 1.
The resistivity of safe floor described in the present embodiment is 0.01 Ω m, if cathode burrs on edges pierces through diaphragm, Jiu Huiyu
Safety coatings are in contact, and form faint self discharge, and battery core voltage is caused to decline, will when voltage tester in this way before storehouse under battery core
There are the battery core of the risk, actual measurements risk battery core recall rate can be promoted 3% for discovery in time.
Embodiment 4
The present embodiment the difference from embodiment 1 is that, by embodiment 1 positive electrode safe floor replace are as follows: be by D50
3 μm of alumina particle gathers inclined tetrafluoroethene and conductive black according to the ratio mixing of weight ratio 93:2:5, and NMP is added later,
Form slurry, be coated onto position adjacent with electrode diaphragm on plus plate current-collecting body later, coating position as shown in Figure 1,
Formed safe floor, gained safe floor with a thickness of 40 μm, other conditions are identical compared with Example 1.
The resistivity of coating described in the present embodiment anode pole piece is 0.9 Ω m, if cathode burrs on edges pierces through diaphragm,
It will be in contact with safety coatings, form faint self discharge, cause battery core voltage to decline, the voltage tester in this way before storehouse under battery core
When will find battery core there are the risk in time, risk battery core recall rate can be promoted 5% by actual measurement.
Embodiment 5
The present embodiment and the difference of embodiment 4 are, the alumina particle in embodiment 4 is replaced with the matter such as same particle size
The Kynoar particle of amount, is added conductive black later, and the weight ratio for gathering inclined tetrafluoroethene and conductive carbon black is 94:6；Then
NMP is added and forms slurry, is coated onto position adjacent with electrode diaphragm on plus plate current-collecting body later, coating position is as schemed
Shown in 1, formed safe floor, gained safe floor with a thickness of 20 μm, other conditions are identical compared with Example 4.
The resistivity of coating described in the present embodiment anode pole piece is 1.2 Ω m, and actual measurement can propose risk battery core recall rate
Rise 2%.
Embodiment 6
The present embodiment and the difference of embodiment 4 be, the thickness of safe floor is replaced with 50 μm, other conditions and embodiment
4 compared to identical.
The resistivity of coating described in the present embodiment anode pole piece is 0.9 Ω m, and actual measurement can propose risk battery core recall rate
Rise 3%.
Embodiment 7
The present embodiment and the difference of embodiment 5 be, the thickness of safe floor is replaced with 10 μm, other conditions and embodiment
5 compared to identical.
The resistivity of coating described in the present embodiment anode pole piece is 0.9 Ω m, and actual measurement can propose risk battery core recall rate
Rise 5.5%.
Embodiment 8
The present embodiment the difference from embodiment 1 is that, the weight ratio of conductive black is promoted from 5% to 10%, other
Part is identical compared with Example 1.
The resistivity of coating described in the present embodiment anode pole piece is 0.0005 Ω m, and actual measurement can detect risk battery core
Rate promotes 5.3%.
Embodiment 9
The present embodiment the difference from embodiment 1 is that, the weight ratio of conductive black is reduced to 0.1% from 5%, other
Part is identical compared with Example 1.
The resistivity of coating described in the present embodiment anode pole piece is 10000 Ω m, and actual measurement can be by risk battery core recall rate
Promote 1%.
Comparative example 1
This comparative example is the difference from embodiment 1 is that be added without conductive carbon black, other conditions in the preparation process of safe floor
It is identical compared with Example 1.
The resistivity of coating described in this comparative example anode pole piece is 200M Ω m, can not detect that cathode burrs on edges is
No puncture diaphragm.
Comparative example 2
This comparative example is the difference from example 2 is that be added without conductive black, other conditions in the preparation process of safe floor
It is identical compared with Example 2.
The resistivity of coating described in this comparative example anode pole piece is 100M Ω m, can not detect that cathode burrs on edges is
No puncture diaphragm.
Comparative example 3
The difference of this comparative example and embodiment 3 is to be added without conductive black, other conditions in the preparation process of safe floor
It is identical compared with Example 3.
The resistivity of coating described in this comparative example anode pole piece is 500M Ω m, can not detect that cathode burrs on edges is
No puncture diaphragm.
Comparative example 4
The difference of this comparative example and embodiment 4 is to be added without conductive black, other conditions in the preparation process of safe floor
It is identical compared with Example 4.
The resistivity of coating described in this comparative example anode pole piece is 300M Ω m, can not detect that cathode burrs on edges is
No puncture diaphragm.
Performance test:
The test method of capacity retention ratio: battery is placed in 25 DEG C ± 2 DEG C of incubator, in the method for 0.5C constant current constant voltage
It charges to battery core, is then allowed to stand 30 minutes, is discharged with the multiplying power of 0.5C after standing battery, then stand 30 minutes again,
Loop test is carried out with this, until battery capacity conservation rate is 80% end of initial capacity.
The method of the detection of risk battery core described in embodiment and comparative example part are as follows: after battery core completes volume test, charging
To 70%SOC, battery standing 24 hours, cell voltage U1 is then measured, then after standing 48 hours, measures cell voltage again
U2, according to formula: (U1-U2)/48 calculates battery voltage drop hourly, told according to the size of voltage drop in
The battery of portion's micro-short circuit (inside has the battery core voltage drop of micro-short circuit significantly greater).
By taking embodiment 4 and comparative example 4 as an example, the cycle performance for the battery core that assembling obtains is tested, test result is such as
Shown in Fig. 3, as seen from the figure, the setting of the application safe floor will not adversely affect the cycle performance of battery core.
The Applicant declares that the foregoing is merely a specific embodiment of the invention, but protection scope of the present invention not office
It is limited to this, it should be clear to those skilled in the art, any to belong to those skilled in the art and take off in the present invention
In the technical scope of dew, any changes or substitutions that can be easily thought of, and all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of battery core pole piece, which is characterized in that the battery core pole piece includes collector, electrode diaphragm and safe floor；The peace
The resistivity of holostrome is 1 × 10-4M~1 × 10 Ω4Ω·m。
2. battery core pole piece as described in claim 1, which is characterized in that the resistivity of the safe floor is 1 × 10-1M~1 Ω
×102Ω·m；
Preferably, the electrode diaphragm contains active material；
Preferably, the electrode diaphragm is located at the surface of collector；
Preferably, the safe floor is located at the boundary on the surface of collector, the surface of electrode diaphragm or collector and electrode diaphragm
In the surface at place any one or at least two combination；
Preferably, the safe floor is located at the boundary on the surface of collector, the surface of electrode diaphragm and collector and electrode diaphragm
The surface at place；
Preferably, the safe floor is located at the single side surface or double-sided surface of collector.
3. battery core pole piece as claimed in claim 1 or 2, which is characterized in that include insulating materials and conduction in the safe floor
The combination of material and/or the combination of ceramic particle and conductive material；
Preferably, the insulating materials include Kynoar, polyurethane, Sodium Polyacrylate, butadiene-styrene rubber, polyetherimide,
Carboxymethyl cellulose, acrylate, polyethylene terephthalate, polybutylene terephthalate, polypropylene or polyethylene
In any one or at least two combination；
Preferably, the ceramic particle includes silica, silicon carbide, barium titanate, titanium oxide, vanadium oxide, Al2O3Or γ-
In AlOOH any one or at least two combination.
4. battery core pole piece as claimed in claim 3, which is characterized in that the conductive material includes carbon material and/or metal powder
End；
Preferably, carbon material include in conductive black, graphite or acetylene black any one or at least two combination；
Preferably, the metal powder include in copper powder, aluminium powder or nickel powder any one or at least two combination.
5. battery core pole piece as described in claim 3 or 4, which is characterized in that insulating materials and conductive material in the safe floor
Combination and/or the combined mass percentage of ceramic particle and conductive material be 1%-99%；
Preferably, the insulating materials includes insulating material particle；
Preferably, the insulating material particle includes Kynoar particle, polyurethane particles, Sodium Polyacrylate particle, butylbenzene
Rubber grain, polyetherimide particle, carboxymethyl cellulose particle, acrylate particles, polyethylene terephthalate
In grain, polybutylene terephthalate particle, PP GRANULES or polyethylene particle any one or at least two combination；
Preferably, the partial size of the insulating material particle is 1-100 μm, preferably 1-20 μm；
Preferably, the partial size of the ceramic particle is 1-100 μm, preferably 1-20 μm.
6. battery core pole piece as described in any one in claim 1-5, which is characterized in that the safe floor with a thickness of 1-100 μm,
Preferably 15-60 μm.
7. battery core pole piece as claimed in any one of claims 1 to 6, which is characterized in that the preparation method of the safe floor includes applying
Any one in covering, attach, sputter or depositing.
8. such as the described in any item battery core pole pieces of claim 1-7, which is characterized in that the safe floor is porous structure；
Preferably, the hole road shape of the porous structure includes any one in circle, ellipse or polygon or at least two
The combination of kind；
Preferably, the duct of the porous structure is through-hole or half-via.
9. a kind of battery core, which is characterized in that the anode pole piece and/or cathode pole piece of the battery core use claim 1-8 such as to appoint
Battery core pole piece described in one.
10. battery core as claimed in claim 9, which is characterized in that the battery core is used as claim 1-8 is described in any item
Battery core pole piece assembles to obtain by the method for winding or lamination.
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Effective date of registration: 20220126 Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zenergy Battery Technologies Co.,ltd Address before: 210000 249 Lantian Road, Airport Economic Development Zone, Jiangning District, Nanjing City, Jiangsu Province Applicant before: JIANGSU TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: DONGGUAN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: SHENZHEN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. |
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