CN1527418A - Battery partitioning board - Google Patents
Battery partitioning board Download PDFInfo
- Publication number
- CN1527418A CN1527418A CNA031138861A CN03113886A CN1527418A CN 1527418 A CN1527418 A CN 1527418A CN A031138861 A CNA031138861 A CN A031138861A CN 03113886 A CN03113886 A CN 03113886A CN 1527418 A CN1527418 A CN 1527418A
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- Prior art keywords
- battery separator
- porous
- metal material
- polymer
- resin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The battery partitioning board includes at least one layer of composite porous metal material layer with metal fiber. The surface of the metal fiber may be covered with one layer of protective layer. The composite porous metal material layer may be metal fiber non-woven fabric, metal fiber net or polymer sheet or non-woven fabric with mixed metal fiber. The addition of the metal fiber to the battery partitioning board can raise the mechanical strength and safety of the battery partitioning board effectively, reduce the thickness of the battery partitioning board and the volume of the battery, and increase the amount of electrolyte or colloid stored in the battery.
Description
[technical field]
The present invention relates to a kind of battery separator.
[background technology]
Battery separator is that the negative electrode of battery and anode are separated, and to stop two short circuit between electrodes, allows electrolyte or ion to pass through simultaneously.The physical isolation that provides between negative electrode and anode is provided the required fundamental property of battery separator, be convenient to low resistance that electrolyte or ion pass through, excellent electrolyte wetability, battery assembling and use required mechanical strength, provide high charge density required minimum block board thickness, have the enough intensity that pierces through with the damage of impermeabilisation and electrode and have turn-off function.Wherein turn-off function is meant significantly being lower than and can causes that closing its micropore under the temperature that the battery Spurs wears blasts with prevention.Existing battery separator can be made by the porous thin slice of natural or synthetic material.These porous thin slices can comprise the sheets of fibres or the film of nonwoven or spinning.Typical material as these porous thin slices has olefin polymers such as polypropylene, polyethylene, announce the CN1057873C patent as China, it discloses a kind of employed dividing plate of battery and manufacture method thereof that adopts organic electrolyte, be that mixture by polyethylene, polypropylene, organic liquid and inorganic micro powder end is processed to form film like through extrusion modling, extract organic liquid and inorganic powder then thus in the film to make required dividing plate.But this dividing plate is only made by thin polymer film, so mechanical strength is relatively poor, is easy to produce deformation and the fail safe that influences battery.In addition, when temperature in the battery raises, because of the polymeric material coefficient of heat conduction of dividing plate is lower, can not in time to the dividing plate gross area, make microcellular structure fusion sealing thermal diffusion, thereby Yi Yin localized hyperthermia cause local barrier film cause thermal damage and can't effectively bring into play safety effect with cut-off current.
[summary of the invention]
The object of the present invention is to provide the higher and safer battery separator of a kind of mechanical strength.
To achieve these goals, the invention provides a kind of battery separator, comprise one deck porous metal material composite bed at least, this porous metal material composite bed includes metallic fiber.
Compare existing battery separator, battery separator of the present invention comprises one deck porous metal material composite bed, therefore can effectively improve the mechanical strength and the fail safe of battery separator, and can make the thickness of battery separator littler, thereby reduce the battery volume, improve the electrolyte of battery or the storage capacity of colloid.And contain metallic fiber in the metal material composite bed of battery separator of the present invention, its coefficient of heat conduction is higher, therefore when short circuit phenomenon takes place, can be fast with thermal diffusion to the dividing plate gross area and make the microcellular structure fusion seal with cut-off current.
[embodiment]
In the first embodiment of the invention, battery separator is to be made of two layers of polymers porous layer and the porous metal material composite bed that is sandwiched between the two.This porous polymer layer can be micro polymer porous membrane or adhesive-bonded fabric, and has a certain porosity, its material is a thermoplastic resin as vistanex, as the homopolymers of ethene, propylene, butylene, methyl butene, methylpentene or hexene, one or more of these alkene with can with the copolymer of one or more monomers of olefinic polymerization; Acrylic resin such as polymethyl acrylate, polymethyl methacrylate or ethylene-ethyl acrylate copolymer; Styrene resin such as BS, polystyrene, s-B-S copolymer, styrene-isoprene-styrene copolymer-or styrene-propene ester copolymer; Vinyl chloride resin; Fluoroethylene resin such as polyvinyl fluoride or polyvinylidene fluoride; Saturated ester resin such as polybutylene terephthalate (PBT); Merlon; Polyphenylene oxide; Polyacetals; Polyphenylene sulfide; Silicone resin; The thermoplastic polyurethane resin; Polyether-ether-ketone; Various thermoplastic elastomer (TPE)s; More than these resins crosslinked etc.This porous polymer layer material is preferably vistanex, more preferably polyethylene, polypropylene or the mixture of the two, and two porous polymer layer materials can be identical also can be different, be polyethylene or be polypropylene screen as two porous polymer layers, perhaps the one layer of polymeric porous layer is that polyethylene film and another layer is polypropylene screen.
If the aforementioned polymer porous layer is a porous membrane, as the polypropylene porous membrane, add a certain amount of filler during manufacturing, as organic filler or inorganic filler.Wherein inorganic filler comprises conventional inorganic fillers such as calcium carbonate, magnesium carbonate, brium carbonate, talcum, mica, silicon dioxide, titanium dioxide, hydrotalcite, diatomite, calcium sulfate, barium sulfate, magnesium sulfate, aluminium hydroxide, magnesium hydroxide, aluminium oxide, zinc oxide, zeolite and kaolin.Wherein be preferably calcium carbonate, hydrotalcite, barium sulfate, magnesium hydroxide and aluminium oxide etc.Organic filler can be various resin particles, as the homopolymers of styrene, ketenes, methyl methacrylate, EMA, glycidyl methacrylate or methyl acrylate, two or more is selected from the copolymer of monomer of above set of monomers and condensation polymer etc.The average grain particle diameter of above-mentioned filler is not more than 1.2 microns.Be the stability of strengthening this porous membrane, non-oxidizability etc., also optionally add a certain amount of additive when making this porous polymer layer, stretching auxiliary agent of making as aliphatic ester, low-molecular-weight polyolefin, stabilizer, antioxidant, ultra-violet absorber, fire retardant and non-ionic surface active agent etc.And make the technology of this porous membrane, can adopt dry method processing procedure or wet method processing procedure, the embodiment of dry method processing procedure is: one or more resins that will be selected from above-mentioned thermoplastic resin, as polyethylene and/or acrylic resin, put into mixing arrangement such as roller, mixing roll simultaneously with filler and non-essential suitable additives, single shaft is extruded or biaxial extruder mixes, with the preparation resin combination, by the film molding methods, produce film as inflation processing, calendering processing or extrusion molding by this resin combination.Then, with this film stretching with the micropore of formation at the interface at filler and interlaminar resin.Stretching can be adopted uniaxial tension or biaxial stretch-formed, and draft temperature preferably is less than or equal to the fusing point or the softening point of thermoplastic resin, and draw ratio should be lower than 16 times.Be thermal endurance and the intensity that improves this porous membrane, can make the thermoplastic resin of this porous membrane crosslinked, crosslinked by existing radioactive ray such as electron beam irradiation or the realization of other method.And the wet method processing procedure is processed into sheet after must utilizing hydrocarbon solvent or other low-molecular-weight molecule and olefin heating and melting earlier, is drawn into film then, at last solvent is before extracted with volatile solvent.
If the aforementioned polymer porous layer is the polymer adhesive-bonded fabric, as polyethylene adhesive-bonded fabric or polypropylene adhesive-bonded fabric, the perhaps adhesive-bonded fabric that mixes of polyethylene and polypropylene fibre formation, the average diameter of used fiber is no more than 3 microns.The fiber of above-mentioned polymer adhesive-bonded fabric can contain the fusion composition, by this fusion composition fibre fusion is fixed, fusion method can be depressed in nothing and carry out, and also can carry out adding to depress, perhaps depress the laggard row pressurization of fusion fusion composition in nothing, this melts and composition can be a thermoplastic resin.Then, form fleece by above-mentioned selected fiber, can be by dry method such as card method, contactless method, spin glutinous type adhesive-bonded fabric method or fusing fusing method and wait and form fleece, also can form this fleece, as horizontal fourdrinier wire mode, the short net mode of inclination cloth line style or fourdrinier wire-cylinder associated form by wet method.
Aforementioned porous metal material composite bed is preferably the stainless steel fibre layer, and this stainless steel fibre layer can or sandwich an amount of stainless steel fibre for stainless steel adhesive-bonded fabric, stainless steel fiber web and make in a polymer flake or polymer adhesive-bonded fabric.For preventing that stainless steel fibre is corroded, but TiN coating in its surface coating also can be covered with existing insulation coating.This stainless steel fibre adhesive-bonded fabric, stainless steel fiber web or in a polymer flake or polymer adhesive-bonded fabric, sandwich an amount of stainless steel fibre, adopt superfine stainless steel fibre to make by existing method, and make the stainless steel fibre layer that makes have porous, when it combines with the aforementioned polymer porous layer and after forming battery separator, does not influence porosity.Between this stainless steel fibre layer and the porous polymer layer with binder bind, fusion is cohered or by mechanical engagement aforementioned three-layered node integrator is formed battery separator.
After the preparation of aforementioned two layers of polymers porous layer and metal material composite bed, carry out hot binding by hot-rolling with three layers and be integral and form battery separator of the present invention.
The battery separator of the second embodiment of the present invention only is made of one deck porous metal material composite bed, this porous metal material composite bed is by mixing the superfine metallic fiber of an amount of diameter in one or more adhesive-bonded fabrics made that are selected from aforementioned thermoplastic resin or the thin slice, to strengthen the mechanical strength of battery separator, and keeping or improving under mechanical strength, porosity and the safety conditions, battery separator of the present invention can be made into thinner.When preparing this porous metal material composite bed, also can add aforementioned filler and additive, and this metallic fiber can carry out surface treatment by aforementioned manner.
The battery separator of the third embodiment of the present invention is made of the compound porous composite bed of metallic fiber and thermoplastic polymer one layer of polymeric porous layer and one deck, to reach mechanical strength, porosity and the fail safe that improves battery separator.Contain the fusion composition in the aforementioned polymer porous layer, also contain the fusion composition in the metal material composite bed, porous polymer layer and metal material composite bed pass through between hot-rolling, are integral and form battery separator thereby the two is carried out hot binding.
For strengthening the electrolyte wetability of battery separator of the present invention, can carry out hydrophilic treated to the above-mentioned battery separator that obtains, as carry out sulfonation processing, fluorine gas processing, vinyl monomer glycerol polymerization processing, surfactant processing, discharge process, give the hydrophilic resin processing or carry out the ionizing radiation processing.
Claims (14)
1. battery separator, it is characterized in that: this battery separator comprises one deck porous metal material composite bed at least, includes metallic fiber in this porous metal material composite bed.
2. battery separator as claimed in claim 1, it is characterized in that: described porous metal material composite bed is to be made by hybrid metal fiber in polymer resin matrix or the polymer fiber, include the fusion composition in described polymer resin matrix or the polymer fiber, described polymer fiber and metallic fiber are consolidated into one by this fusion composition.
3. battery separator as claimed in claim 1 is characterized in that: described metallic fiber surface is covered with protective layer.
4. battery separator as claimed in claim 2, it is characterized in that: described battery separator further comprises a porous polymer layer, and carries out heat fused or hot pressing fusion by its contained fusion composition between described porous polymer layer and described porous metal material composite bed.
5. battery separator as claimed in claim 1 is characterized in that: described metal material composite bed comprises the two layers of polymers porous layer and the porous metal material layer that is sandwiched between the two constitutes.
6. battery separator as claimed in claim 5 is characterized in that: described metal material layer is porous metal fiber adhesive-bonded fabric, metal web or the hybrid metal fiber is made in polymer resin matrix or polymer fiber thin slice or adhesive-bonded fabric.
7. battery separator as claimed in claim 6, it is characterized in that: described porous polymer layer is thermoplastic polymer adhesive-bonded fabric or thin slice, and described porous polymer layer and metal material interlayer carry out heat fused or hot pressing fusion by the contained fusion composition of porous polymer layer.
8. as claim 2,4 or 6 described battery separators, it is characterized in that: described polymer is to be thermoplastic resin.
9. battery separator as claimed in claim 8 is characterized in that: described thermoplastic resin is the crosslinked of vistanex, acrylic resin, styrene resin, vinyl chloride resin, fluoroethylene resin, saturated ester resin, Merlon, polyphenylene oxide, polyacetals, polyphenylene sulfide, silicone resin, thermoplastic polyurethane resin, polyether-ether-ketone, various thermoplastic elastomer (TPE) or above these resins.
10. battery separator as claimed in claim 9 is characterized in that: described thermoplastic resin is preferably polyolefin.
11. as claim 2,4 or 6 described battery separators, it is characterized in that: contain organic filler or inorganic filler in described porous metal material composite bed and the porous polymer layer.
12. battery separator as claimed in claim 11 is characterized in that: contain additive in described porous metal material composite bed and the porous polymer layer.
13. battery separator as claimed in claim 12 is characterized in that: described additive is the stretching auxiliary agent that aliphatic ester, low-molecular-weight polyolefin, stabilizer, antioxidant, ultra-violet absorber, fire retardant or non-ionic surface active agent are made.
14. battery separator as claimed in claim 1 is characterized in that: described metallic fiber is preferably stainless steel fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031138861A CN100446304C (en) | 2003-03-07 | 2003-03-07 | Battery partitioning board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031138861A CN100446304C (en) | 2003-03-07 | 2003-03-07 | Battery partitioning board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527418A true CN1527418A (en) | 2004-09-08 |
| CN100446304C CN100446304C (en) | 2008-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031138861A Expired - Fee Related CN100446304C (en) | 2003-03-07 | 2003-03-07 | Battery partitioning board |
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| Country | Link |
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| CN (1) | CN100446304C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102326277A (en) * | 2008-12-24 | 2012-01-18 | 三菱树脂株式会社 | Battery separator and non-water lithium battery |
| CN105226226A (en) * | 2015-09-22 | 2016-01-06 | 东莞市爱思普能源科技有限公司 | A kind of lithium ion battery separator and the method with its monitoring battery short circuit |
| CN108598339A (en) * | 2017-11-16 | 2018-09-28 | 乳源东阳光氟树脂有限公司 | A kind of smart polymer lithium battery diaphragm |
| CN114421026A (en) * | 2015-08-10 | 2022-04-29 | 达拉米克有限责任公司 | Improved separators, batteries, battery strings and related methods with improved performance |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59154752A (en) * | 1983-02-22 | 1984-09-03 | Japan Storage Battery Co Ltd | Nickel zinc battery |
| CN1046358A (en) * | 1985-11-05 | 1990-10-24 | 埃尔塔克系统公司 | Inorganic-polymer composite fibrous method for making and purposes (comprising) as the stable dividing plate of manufacturing dimension |
| DE69211510T2 (en) * | 1991-07-05 | 1996-10-10 | Asahi Chemical Ind | Separator of a battery in which an organic electrolyte is used and its production |
| US5667911A (en) * | 1994-11-17 | 1997-09-16 | Hoechst Celanese Corporation | Methods of making cross-ply microporous membrane battery separator, and the battery separators made thereby |
| JP2002198024A (en) * | 2000-12-26 | 2002-07-12 | Japan Vilene Co Ltd | Separator for cell |
-
2003
- 2003-03-07 CN CNB031138861A patent/CN100446304C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102326277A (en) * | 2008-12-24 | 2012-01-18 | 三菱树脂株式会社 | Battery separator and non-water lithium battery |
| CN114421026A (en) * | 2015-08-10 | 2022-04-29 | 达拉米克有限责任公司 | Improved separators, batteries, battery strings and related methods with improved performance |
| CN105226226A (en) * | 2015-09-22 | 2016-01-06 | 东莞市爱思普能源科技有限公司 | A kind of lithium ion battery separator and the method with its monitoring battery short circuit |
| CN108598339A (en) * | 2017-11-16 | 2018-09-28 | 乳源东阳光氟树脂有限公司 | A kind of smart polymer lithium battery diaphragm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100446304C (en) | 2008-12-24 |
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