CN207758271U - A kind of corrosion-resisting lithium battery encapsulation aluminum plastic film - Google Patents
A kind of corrosion-resisting lithium battery encapsulation aluminum plastic film Download PDFInfo
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- CN207758271U CN207758271U CN201721694768.9U CN201721694768U CN207758271U CN 207758271 U CN207758271 U CN 207758271U CN 201721694768 U CN201721694768 U CN 201721694768U CN 207758271 U CN207758271 U CN 207758271U
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Abstract
The utility model provides a kind of corrosion-resisting lithium battery encapsulation aluminum plastic film, includes mainly protective layer, aluminium foil layer and hot sealing layer, it is characterised in that：The protective layer is be bonded compound by cementing layer with aluminium foil layer, and the aluminium foil layer is compound by hot pressing with hot sealing layer；The mode that the aluminium foil layer is all made of anodic oxidation before bonding is compound and hot pressing is compound is surface-treated；The material of the hot sealing layer is Three Layer Coextruded Polyolefin composite membrane, and internal layer is adhesive layer, and middle layer is structure sheaf, and outer layer is barrier layer；The thickness of the protective layer is 10~50 μm, and the thickness of the aluminium foil layer is 20~80 μm, and the thickness of the hot sealing layer is 20~120 μm.The aluminum plastic film product has higher electrolyte resistance performance, encapsulation cohesive force, is suitable for high-performance lithium cell package aluminum plastic film.
Description
Technical field
The utility model is related to encapsulating material fields, relate generally to soft package lithium battery encapsulating material field, and in particular to one
Kind soft package lithium battery encapsulation aluminum plastic film.
Background technology
Aluminum plastic film is by outer protective layer（ON or PET etc.）, intermediate aluminium foil layer（AL layers）, internal layer hot sealing layer（CPP or PP）
The composite material of composition carries out pipe sensitive adhesion by adhesive between layers.Aluminum plastic film is electric core of flexible packing lithium battery encapsulation
Critical material, monolithic battery assembling after sealed to form battery with aluminum plastic film, aluminum plastic film play the role of protect content.It is full
The demand of sufficient lithium battery, each layer have material and technology very high requirement.
Currently, the preparation of aluminum plastic film mainly has two kinds of dry method and Re Fa on the market.Dry process is between AL and CPP with connecing
After agent bonding, directly press.And hot method between AL layers and CPP layers with MPP then, then slow increasing temperature and pressure again
Condition thermal synthesis.Aluminum plastic film there is also some problems in use at present, electrolyte resistance performance is mainly reflected in, in safety
There are certain security risks in problem.
It is formed from the organic solvent of electrolyte, predominantly carbonates, is the solvent that polarity is strong, permeability is strong.According to
Similar compatibility principle, the currently used internal layer adhesive with polar group are easy to be corroded by electrolyte, lose and glued
Close strength reduction or failure so that aluminum plastic film loses the packaging protecting effect to battery.
In terms of the component of the lithium salts of electrolyte, they are easily hydrolyzed, and are met water and are just resolved into extremely strong corrosive hydrogen fluorine
Acid and other gases, once and hydrofluoric acid invades aluminium foil layer with solvent, the aluminium foil surface Nian Jie with hot sealing layer soon will be broken quickly, made
Aluminium foil and interior UF membrane, cause more violent electrochemical corrosion so that packaging structure is destroyed.
At present for improve aluminum plastic film corrosion resistance solution it is more concentrate on increase internal layer barrier the number of plies or
Increase on thickness.Although these methods can improve rotproofness performance to a certain extent, also occurs a series of problems simultaneously.
If increase barrier the number of plies, showed on barrier property than single layer Obstruct membrane really it is more excellent, but on the one hand its layer with
Binding force between layer is weaker than single layer barrier layer, and on the other hand time cost when its preparation and processing cost will greatly improve.
And if increase thickness, cannot effectively solve the problems, such as corrosion-resistant, only extend the corrosion-resistant time, on the one hand increase material at
This, does not on the other hand meet the increasingly lightening trend of aluminum plastic film yet.
CN101992570A discloses a kind of lithium battery encapsulation aluminum plastic film, includes mainly protective layer, aluminium foil layer and heat-sealing
Layer, and the protective layer is be bonded compound by cementing layer respectively between aluminium foil layer and hot sealing layer and aluminium foil layer, the protection
Layer between aluminium foil layer and hot sealing layer and aluminium foil layer by cementing layer it is be bonded it is compound before, the protective layer, aluminium foil layer and heat-sealing
The processing of plasma technique surface grafting is respectively adopted in layer material surface, then again the protective layer and aluminium foil layer and aluminium
It is compound that layers of foil and hot pressing layer carry out hot pressing with the two sides of a cementing layer respectively.This method preparation process is required for all layers
Surface Treatment with Plasma is carried out, process is complicated, and cost is excessively high, is not suitable for industrialized production.CN101992570A also discloses that one
Kind lithium battery encapsulation aluminum plastic film, the material of wherein hot sealing layer are at least polyethylene film, polypropylene film, polyethylene-propylene
One of film, unsaturated acids modified poly ethylene film and unsaturated acids modified polypropylene film are not directed to improve electrolyte resistance
Function also have room for improvement.
Invention content
In view of the above-mentioned problems, the utility model provides a kind of corrosion-resisting lithium battery encapsulation aluminum plastic film, main includes protecting
Sheath, aluminium foil layer and hot sealing layer, the protective layer is be bonded compound by cementing layer with aluminium foil layer, and the aluminium foil layer is logical with hot sealing layer
It is compound to cross hot pressing；The mode that the aluminium foil layer is all made of anodic oxidation before bonding is compound and hot pressing is compound is surface-treated；
The material of the hot sealing layer is Three Layer Coextruded Polyolefin composite membrane, and internal layer is adhesive layer, and middle layer is structure sheaf, and outer layer is barrier
Layer；The thickness of the protective layer is 10~50 μm, and the thickness of the aluminium foil layer is 20~80 μm, and the thickness of the hot sealing layer is 20
~120 μm.
Preferably, the electrolyte main component for the anodic oxidation that aluminium foil layer material uses for sulfuric acid 50~80%, oxalic acid 5~
30%, 10~20% aqueous solution that the mixture of sulfonic acid 5~30% is made into.Preferably, the material of protective layer is to stretch to gather to benzene
Dioctyl phthalate butanediol ester（OPBT）Film.
Preferably, cementing layer is to be bonded protective layer and aluminium foil layer compound directly by the way of adhesive coating.
Preferably, adhesive layer is made of thermoplastic linear polymer.Wherein ethylenemethylmethacrylate copolymer
40~70%, ethylene-vinyl acetate copolymer 10~40%, ethylene octene copolymer 10~40%, antioxidant 0.2~2%, it is described viscous
It is 5-30 μm to tie layer overall thickness.
Preferably, structural material be HMW(high molecular weight)-high density polyethylene 40~60%, ultra-high molecular weight polyethylene 5~
20%, high density polyethylene (HDPE) 30~50%, antioxidant 0.5~2%, thickness is from 10~50 μm.
Preferably, barrier material is cast polypropylene film, 5-30 μm of thickness.
Preferably, adhesive layer：Structure sheaf：The ratio between thickness of barrier layer is 1:2:1.
Aluminium foil layer material is surface-treated by the way of anodic oxidation, the electrolyte main component of the anodic oxidation
10~20% aqueous solution being made by the mixture of sulfuric acid 50~80%, oxalic acid 5~30%, sulfonic acid 5~30%.With
Plasma (orifice) gas surface treating method disclosed in CN101992570A is compared, anodic oxidation more convenient and quicker, cheap, effect
Also more preferable.By anodizing, so that aluminium foil surface layer is formed oxide layer, improves the corrosion-resistant and electrolyte resistance performance of aluminium foil,
The high molecular material of aluminium foil and thermally stratified layer and the bond properties of adhesive can also be improved.Therefore cementing layer can directly use adhesive
The mode of coating, protective layer and aluminium foil layer bonding is compound.Compared with common heat curing type gluing method, direct gluing is obviously imitated
Rate higher, cost are lower.
The material of protective layer can be biaxial tension polyethylene terephthalate (PET) film, poly- 2,6 one naphthalene diformazan
Sour glycol ester (PEN) film, PEN/PET copolymerization film, PEN/PET blend films, polycaprolactam film, toughened polymer oneself two
Sour hexamethylene diamine film and special nylon MXD 6 film stretch polybutylene terephthalate (PBT)（OPBT）Film.Wherein in order to more
The technique effect of good realization the utility model, preferably stretches polybutylene terephthalate (PBT)（OPBT）Film, thickness 10
~50 μm.
The material of hot sealing layer is Three Layer Coextruded Polyolefin composite membrane, and internal layer is adhesive layer, and middle layer is structure sheaf, and outer layer is
Barrier layer.Main material of the more similar polyolefin of molecule segment structure as tolerance electrolytic corrosion is introduced, adhesive layer mainly rises
To the effect for bonding aluminium foil and polyolefin interior layer.Adhesive layer is that thermoplastic linear polymer forms by main body.The thermoplasticity
Linear polymer can be ethylenemethylmethacrylate copolymer, ethylene octene copolymer ethylene-vinyl acetate copolymer, line
Property low density polyethylene (LDPE) and ethylene-vinyl acetate copolymer intermingling material, low density polyethylene (LDPE) and ethylene-vinyl acetate copolymer it is total
Mixed material, polyvinyl butyral, linear low density polyethylene and polyvinyl butyral intermingling material, low density polyethylene (LDPE) with
Polyvinyl butyral intermingling material and ethylene-vinyl acetate and polyvinyl butyral intermingling material.Wherein in order to more preferably realize
The bond effect of adhesive layer and aluminium foil, preferably ethylenemethylmethacrylate copolymer, ethylene-vinyl acetate copolymer, ethylene
Octene copolymer and other auxiliary agents.More preferably ethylenemethylmethacrylate copolymer 40~70%, ethylene-vinyl acetate are total
Polymers 10~40%, ethylene octene copolymer 10~40%, antioxidant 0.2~2%, the adhesive layer overall thickness are 5-30 μm.
And structure sheaf primarily serves effect made of endothecium structure, can also play barrier electrolytic corrosion jointly with barrier layer
Effect, structural material be HMW(high molecular weight)-high density polyethylene 40~60%, ultra-high molecular weight polyethylene 5~20%, high density
Polyethylene 30~50%, antioxidant 0.5~2%, 10~50 μm of thickness.Barrier material is cast polypropylene film, 5-30 μm of thickness.
Structure sheaf and barrier layer collective effect, play the role of completely isolated electrolyte, and support the overall structure of aluminum plastic film, improve it
Mechanical property.In order to preferably realize the effect of the utility model, the ratio between thickness of structure sheaf and barrier layer is 5:1-1:1, it is excellent
It is selected as 2：1.
The utility model has the beneficial effects that：The aluminum plastic film is with superior heat resistance, wearability and flexible stretching
Polybutylene terephthalate (PBT)（OPBT）Film has high steam, oxygen obstruction rate and flexibility as outermost layer protective layer
Preferable aluminium foil carries out anodic oxidation pretreatment as middle layer, and to it, further increases its corrosion-resistant and easy adhesive property,
With Three Layer Coextruded Polyolefin composite membrane as innermost layer, it is Nian Jie with aluminium foil layer strong that Three Layer Coextruded Polyolefin composite membrane plays internal layer
Degree does not reduce, the effect of completely isolated electrolyte, and supports the overall structure of aluminum plastic film, improves its mechanical property and electrolyte resistance
Performance.The product have higher chemical resistance, every it is wet, oxygen barrier, encapsulation cohesive force and can it is explosion-proof, be suitable for high-performance lithium battery
Encapsulation aluminum plastic film.
Description of the drawings
Fig. 1：The structural schematic diagram of the lithium battery encapsulation aluminum plastic film of the utility model.
Wherein 1 indicates protective layer, and 10-50 μm, 2 indicate cementing layer（Adhesive）, 3 indicate adhesive layer, and 20-80 μm, 4 indicate
Adhesive layer, 5-30 μm, 5 expression structure sheafs, 10-50 μm, 6 expression barrier layers, 10-50 μm.
Specific implementation mode
The utility model is described further with reference to specific embodiment.
The distinguishing characteristics of table 1 embodiment and comparative example
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7（It is external Sample） | Comparative example 8（It is external Sample） | |
| Aluminium foil layer | Anodic oxygen Change, 50 μm | Anodic oxygen Change, 50 μ m | Anodic oxygen Change, 50 μ m | Non- anode Oxidation, 50μm | Anodic oxygen Change, 50 μ m | Anodic oxygen Change, 50 μ m | Anodic oxygen Change, 50 μ m | Anodic oxygen Change, 50 μm | Anodic oxygen Change, 50 μ m | Plasma Processing | Plasma Processing |
| Protective layer | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film | PET is thin Film | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film | OPBT is thin Film |
| Hot sealing layer | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Three layers altogether Cohering alkene Hydrocarbon is compound Film | Without structure Layer | Without barrier Layer | More barriers The number of plies | Barrier is thick Degree is 50 μm |
| Structure sheaf with Barrier layer The ratio between thickness | 2:1 | 1:1 | 5:1 | 2:1 | 2:1 | 1:2 | 10:1 | - | - | - | - |
Manufacture each embodiment and comparative example according to table 1 and manufacture aluminum plastic film, the other parameters that table 1 is not directed to, each embodiment with
Comparative example is consistent.The cohesive force carried out after cohesive force test and electrolyte immersion to embodiment and comparative example is tested.
Table 2：Cohesive force comparison is as follows：（Unit：N/15mm）
| Project | Implement Example 1 | Implement Example 2 | Implement Example 3 | Comparison Example 1 | Comparison Example 2 | Comparison Example 3 | Comparison Example 4 | Comparison Example 5 | Comparison Example 6 | Comparison Example 7 （It is external Sample） | Comparison Example 8 （It is external Sample） |
| Initial adhesion Power | 9-13 | 9-13 | 9-13 | 6-8 | 7-9 | 9-13 | 9-13 | 9-13 | 9-13 | 8~10 | 8~11 |
| Electrolyte soaks Bubble 7 days | 8-12 | 7-10 | 7-9 | 4-6 | 6-8 | 7-8 | 5-6 | 6-8 | 5-7 | 6~9 | 7~9 |
According to above-mentioned performance test comparing result, comparative example 1,2,3 and comparative example 3,4 are it is found that control certain proportion
The Laminate construction thickness of range and barrier layer thickness, can effectively improve anti-electrolytic corrosion effect, and improve bond effect.Comparison
Embodiment 1 is with comparative example 1 it is found that the aluminium foil of anodized has stronger initial adhesive force and anti-electrolyte effect.It is right
Than embodiment 1 and comparative example 2 it is found that the OPBT films that the utility model uses have more than common PET film as protective layer
Strong protecting effect.With comparative example 5,6 it is found that structure sheaf is indispensable with barrier layer, the two makes comparative example embodiment 1 jointly
With, have the effect of enhance electrolyte resistance.Compare the embodiments of the present invention and comparative example 7,8, it is known that the utility model
Aluminum plastic film improves electrolyte resistance performance while internal layer and aluminium foil layer adhesive strength are not reduced.
Claims (8)
1. a kind of corrosion-resisting lithium battery encapsulation aluminum plastic film includes mainly protective layer, aluminium foil layer and hot sealing layer, it is characterised in that：
The protective layer is be bonded compound by cementing layer with aluminium foil layer, and the aluminium foil layer is compound by hot pressing with hot sealing layer；The heat-sealing
The material of layer is Three Layer Coextruded Polyolefin composite membrane, and internal layer is adhesive layer, and middle layer is structure sheaf, and outer layer is barrier layer；It is described
The thickness of protective layer is 10~50 μm, and the thickness of the aluminium foil layer is 20~80 μm, and the thickness of the hot sealing layer is 20~120 μ
m。
2. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：The aluminium foil layer two sides is equal
There is the oxide layer that anodic oxidation is formed.
3. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：The material of protective layer is to draw
Stretch polybutylene terephthalate (PBT) film.
4. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：Cementing layer is directly to use
The mode of adhesive coating, protective layer and aluminium foil layer bonding is compound.
5. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：The adhesive layer overall thickness
It is 5-30 μm.
6. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：The Laminate construction thickness 10
~50 μm.
7. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：Barrier material is curtain coating
Polypropylene screen, 5-30 μm of thickness.
8. corrosion-resisting lithium battery encapsulation aluminum plastic film according to claim 1, it is characterised in that：Structure sheaf：Barrier layer
The ratio between thickness is 2:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721694768.9U CN207758271U (en) | 2017-12-08 | 2017-12-08 | A kind of corrosion-resisting lithium battery encapsulation aluminum plastic film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721694768.9U CN207758271U (en) | 2017-12-08 | 2017-12-08 | A kind of corrosion-resisting lithium battery encapsulation aluminum plastic film |
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| CN207758271U true CN207758271U (en) | 2018-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109367155A (en) * | 2018-10-18 | 2019-02-22 | 常州斯威克光伏新材料有限公司 | A kind of dynamic lithium battery aluminum plastic film and preparation method thereof |
| CN113036271A (en) * | 2021-02-04 | 2021-06-25 | 厦门大学 | Electrolyte-resistant and anti-stripping aluminum-plastic film, preparation method thereof and battery |
-
2017
- 2017-12-08 CN CN201721694768.9U patent/CN207758271U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109367155A (en) * | 2018-10-18 | 2019-02-22 | 常州斯威克光伏新材料有限公司 | A kind of dynamic lithium battery aluminum plastic film and preparation method thereof |
| CN113036271A (en) * | 2021-02-04 | 2021-06-25 | 厦门大学 | Electrolyte-resistant and anti-stripping aluminum-plastic film, preparation method thereof and battery |
| CN113036271B (en) * | 2021-02-04 | 2022-06-21 | 厦门大学 | Electrolyte-resistant and anti-stripping aluminum-plastic film, preparation method thereof and battery |
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Effective date of registration: 20200415 Address after: 201201 room 909a, building a, No. 3000, Longdong Avenue, Pudong New Area, Shanghai Patentee after: SHANGHAI HIUV NEW MATERIALS Co.,Ltd. Address before: 215600 Zhangjiagang North Economic Development Zone, Suzhou, Jiangsu Patentee before: AKCOME FILM & APPLIED NEW MATERIALS (SUZHOU) Co.,Ltd. |