CN205439418U - Soft packaging material of lithium ion battery and use lithium ion battery of this material - Google Patents
Soft packaging material of lithium ion battery and use lithium ion battery of this material Download PDFInfo
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- CN205439418U CN205439418U CN201521131212.XU CN201521131212U CN205439418U CN 205439418 U CN205439418 U CN 205439418U CN 201521131212 U CN201521131212 U CN 201521131212U CN 205439418 U CN205439418 U CN 205439418U
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- lithium ion
- ion battery
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- corrosion
- flexible packing
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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
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Abstract
The utility model discloses the battery field specifically, relates to a soft packaging material of lithium ion battery and use lithium ion battery of this material. The utility model provides a soft packaging material of lithium ion battery includes by outer substrate layer, first adhesive linkage, metal foil layer, second adhesive linkage and the sealing layer that sets gradually in to, be provided with the one deck and prevent the corrosion treatment layer between sealing layer and second adhesive linkage, prevent that the corrosion treatment layer comprises the polytetrafluoroethylene film layer. This application is adopted and to be provided with the soft packaging material who prevents the corrosion treatment layer, and anti hydrofluoric acid ability obviously improves, can be better resist electrochemical corrosion, reinforcing lithium ion battery's safety in utilization with increase life. For further increasing the security, be provided with a spacing arch of extending to electric in -core portion at least on the internal surface of wrapping bag, can reduce electric core to the impact of bag, thereby reduce the metal burr of bag on by the mass flow body and impale and arouse that the bag is by the risk of electrochemical corrosion or short circuit.
Description
Technical field
This utility model field of batteries, specifically, relates to a kind of lithium ion battery flexible packing material and uses the lithium ion battery of this material.
Background technology
In correlation technique, general employing aluminum-plastic composite membrane is as lithium ion battery flexible packing material.The basic composition of aluminum-plastic composite membrane is the layer of polypropylene foil of inner side, middle aluminium foil layer and the nylon overcoat in outside.Lithium ion battery is when battery core encapsulates, and battery core periphery may remain burr or active material particle, in operation of bleeding, and these burrs or granule can puncture internal layer until aluminium foil layer；In battery core encapsulation process, owing to when mechanism or heat-sealing, superfusion causes plastic-aluminum combined film inner layer damaged, and then cause aluminium foil layer directly and electrolyte contacts, now present in electrolyte, contact aluminium lamination is caused pit corrosion by Microamounts of Hydrogen fluoric acid, lose it and intercept steam and the function of air, cause lithium ion battery tympanites or leakage etc. to be lost efficacy.Meanwhile, under the positive pole effect with aluminium foil interlayer potential differences, lithium ion will insert aluminium foil layer by the internal layer of damaged, forms aluminium lithium alloy, aluminium foil layer carries out electrochemical corrosion, thus accelerates the extent of corrosion of aluminium foil layer.
In prior art, the aluminum-plastic composite membrane of disclosed polyamide membrane/thermosetting cementing layer/aluminium foil/thermosetting cementing layer/unsaturated acid anhydride modified polypropylene film has water vapor barrier property, explosion-proof and the thermalsealing bond strength of excellence, but does not has positive effect to solving electrochemical corrosion.Prior art also has and improves resistance to electrochemical corrosion by inorganic oxide-high molecular film, lithium ion battery that housing is transparent, but although high molecular film can alleviate corrosiveness to a certain extent, but also can not tackle the problem at its root, the particularly energy density of lithium ion battery is more and more higher, under the thinnest trend of packaging bag used, etching problem is the most serious.In view of this, the packaging material of a kind of more preferable electrochemically resistant of necessary offer corrosion.
Utility model content
The utility model proposes a kind of lithium ion battery flexible packing material, can preferably resist electrochemical corrosion, strengthen the safety in utilization of lithium ion battery and increase service life.
The lithium ion battery flexible packing material proposed according to this utility model first aspect, including substrate layer the 10, first adhesive linkage 11 set gradually from outside to inside, metal foil layer the 12, second adhesive linkage 13 and sealant 15, being provided with one layer of corrosion-proof layer 14 between described sealant and described second adhesive linkage, corrosion-proof layer is made up of polytetrafluoroethylene film layer.
Preferably, described corrosion-proof layer is incorporated on sealant；Concrete, it is incorporated on sealant by the way of spraying or coating.
Preferably, the thickness of described corrosion-proof layer is less than the 50% of sealant thickness.
Preferably, described corrosion-proof layer is 30～70 μm with the thickness sum of sealant.
Preferably, one or more during the material of described sealant is polyethylene terephthalate, polrvinyl chloride, polyethylene or polypropylene.
Preferably, the outside of described substrate layer is additionally provided with decorative layer 16.
Preferably, described metal foil layer is aluminium foil layer or rustless steel layers of foil.
A kind of lithium ion battery proposed according to this utility model second aspect, including battery core 2, for the packaging bag 1 accommodating battery core and the electrolyte being poured in packaging bag, described packaging bag uses the lithium ion battery flexible packing material of the present invention.
Preferably, the inner surface of packaging bag is provided with at least one to the internal spacing preiection 3 extended of described battery core.
Preferably, the height of spacing preiection is 0.1～0.4mm.
The technical scheme that the application provides can reach following beneficial effect:
Lithium ion battery provided herein is combined with the flexible packing material of corrosion-proof layer by employing, and resistant to hydrogen fluoric acid ability significantly improves, and can preferably resist electrochemical corrosion, strengthens the safety in utilization of lithium ion battery and increases service life.
For increasing safety further, supplement as to bag structure design, on at least one inner surface on bag length direction or width, there is projection, this projection limits the motion of battery core, reducing the battery core impact to bag, reduction bag is pierced through by the metallic bur power on collector thus causes bag to be etched electrochemically or the risk of short circuit.
It should be appreciated that it is only exemplary that above general description and details hereinafter describe, the application can not be limited.
Accompanying drawing explanation
The structural representation of the lithium ion battery flexible packing material without decorative layer that Fig. 1 provides for the embodiment of the present application；
The structural representation of the lithium ion battery flexible packing material with decorative layer that Fig. 2 provides for the embodiment of the present application；
The inside of the lithium ion battery that Fig. 3 provides for the embodiment of the present application one is provided with the schematic diagram of bulge-structure in the width direction.
The inside of the lithium ion battery that Fig. 4 provides for the embodiment of the present application one is provided with the schematic diagram of bulge-structure along its length.Accompanying drawing illustrates:
1-packaging bag；10-substrate layer；11-the first adhesive linkage；12-metal foil layer；13-the second adhesive linkage；14-corrosion-proof layer；15-sealant；16-decorative layer；
2-battery core；
3-spacing preiection；
4-lug.
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet embodiments herein, and for explaining the principle of the application together with description.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the application is described in further detail."front", "rear" described in literary composition, "left", "right", " on ", D score is all with the laying state of the lithium ion battery flexible packing material in accompanying drawing and the lithium ion battery using this material as reference.
As shown in Figure 1, the a certain detailed description of the invention of the application provides a kind of lithium ion battery flexible packing material, and these packaging material include substrate layer the 10, first adhesive linkage 11, metal foil layer the 12, second adhesive linkage 13, corrosion-proof layer 14 and sealant 15 the most successively.
Substrate layer 10 is positioned at the outside of packaging material, plays the effect of outer protective, uses the heat-resistant resin thin film of single or multiple lift, for the cladding material that applicable employing is cold stamping shaped, is selected from polyamide or the extension film of polyester resin or unstretching film.And according to product appearance needs, also can set up the decorative layer such as matt layer, dyeing coating layer 16 (seeing Fig. 2) at the outer surface of substrate layer 10, strengthen the aesthetic property of product.Decorative layer 16 can use coating to be coated on the surface of substrate layer 10 through plate gravure coating method, it is possible to be coated on the surface of substrate layer 10 through extrusion coated mode.
Metal foil layer 12 can use general aluminium foil layer, it would however also be possible to employ stainless steel material, the layers of foil made such as martensitic stain less steel, austenitic stainless steel or ferritic stainless steel etc..
Corrosion-proof layer 14 is made up of polytetrafluoroethylene film layer, can use spraying or coating mode combine with on sealant 15.
Sealant 15 is positioned at inner side, directly contacts with electrolyte and battery core, is the ground floor safeguard procedures of metal foil layer 12, is also to prevent battery core and electrolyte by the last line of defense of external environment influence simultaneously.In the present embodiment, the material of sealant 15 can select the materials such as polyethylene terephthalate, polrvinyl chloride, polyethylene or polypropylene.And corrosion-proof layer 14 is 30～70 μm with the thickness sum of sealant 15, in order to avoid affecting the hot and humid test passing ratio of battery because thickness crosses thin.
As shown in Figure 3, the still another embodiment of the application provides a kind of lithium ion battery, including packaging bag 1, battery core 2, lug 4 and electrolyte (not shown), wherein, in packaging bag 1 uses the lithium ion battery flexible packing material provided in embodiment one to make, and battery core 2 and electrolyte are wrapped in by packaging bag 1 in the lump.
At least one it is provided with to the internal spacing preiection 3 extended of battery core on the inner surface of packaging bag.And at least one inner surface being further disposed upon preferably on length direction or width, the height of spacing preiection is 0.1～0.4mm.In the present embodiment, a packaging bag inner surface in the direction of the width having two and extends raised to battery core inside, the height of projection is 0.2mm.The energy density of raising lithium ion battery that so can be the biggest.
By experimental data, the technique effect of the application will be described in detail below.
Embodiment 1
1. corrosion-proof layer is in the process on sealant surface
Corrosion-proof layer 14 can use spraying or coating mode combine with on sealant 15.
2. the preparation of packaging material
The preparation of packaging material includes substrate layer the 10, first adhesive linkage 11, metal foil layer the 12, second adhesive linkage 13, corrosion-proof layer 14 and sealant 15 from outer layer to internal layer.Corrosion-proof layer 14 is to be coated on sealant 15 with plate gravure coating method.Substrate layer 10 used selects nylon, tack coat to use common binding agent.
With known technology by cobalt acid lithium, conductive agent, binding agent mixed pulp, coat in aluminum foil current collector, dry, cut after tabletting and obtain positive plate；By Delanium, conductive agent, binding agent mixed pulp, coat in copper foil current collector, dry, cut after tabletting and obtain positive plate；Positive and negative pole plate is respectively welded lug；With barrier film positive plate and negative plate separated and wind and make battery；This battery is placed on nylon membrane layer 10, (wherein corrosion-proof layer 14 thickness is 10 μm in packaging bag 1 that tack coat 11, aluminium foil layer 12, tack coat 13, corrosion-proof layer 14, sealant 15 are combined into, sealant 15 thickness is 35 μm), wrap up.
Arrange on inner surface on the width of packaging bag one inside battery core extend spacing preiection, the height 0.2mm of spacing preiection, as shown in Figure 3；One spacing preiection extended inside battery core can also be set on the inner surface on the length direction of packaging bag, the height 0.3mm of spacing preiection, as shown in Figure 4.Respectively placing a piece of acid MODIFIED PP polymer resin layer at lug by the upper and lower faces of packaging bag 1 hot edge seal, then by packaging bag 1, lug 4, polymer resin layer heat-seal bond, heat-sealing temperature is between 120～250 DEG C；First battery is packaged into pouch-type, in the liquid electrolyte inlet sack-type packaging then lithium hexafluoro phosphate, ethylene carbonate, anti-overcharge additive, flame-retardant additive made；After chemical conversion treatment, battery is carried out last heat-sealing together, makes flexible packing lithium ion battery.
Embodiment 2
Basic with embodiment 1, except for the difference that: wherein corrosion-proof layer 14 thickness is 20 μm, sealant 15 thickness is 35 μm.
Embodiment 3
Basic with embodiment 1, except for the difference that: wherein corrosion-proof layer 14 thickness is 30 μm, sealant 15 thickness is 35 μm.
Embodiment 4
Basic with embodiment 1, except for the difference that: respectively having two projections on packaging bag two inner surfacies in the direction of the width, projection is stretched out towards battery core, projection with 0.2mm.
Comparative example 1
Packaging bag 1 in embodiment 1 is changed into and does not increase the packaging bag of corrosion-proof layer 14, make flexible packing lithium ion battery by above-mentioned same procedure.
Comparative example 2
Packaging bag 1 in embodiment 1 is changed into and does not increase the packaging bag of corrosion-proof layer 14, packaging bag inner surface in the direction of the width is not provided with projection, makes flexible packing lithium ion battery by above-mentioned same procedure.
Example 1-4 prepare flexible packing lithium ion battery and comparative example 1, comparative example 2 obtained by flexible packing lithium ion battery do contrast test.Wherein the way of accelerated corrosion test is: by the negative terminal of charged lithium ion battery and packaging film plain conductor short circuit, simulation constitutes electron channel, then storing in the environment of above-mentioned battery being placed on 40-50 DEG C and relative humidity ＞ 90%, whether periodic testing battery housing there occurs electrochemical corrosion.Hot and humid and vibration-vacuum simulation is detection housing seal, and the ambient temperature of the most hot and humid test is 65-75 DEG C, and envionmental humidity is 85-95%；The way of vibration-vacuum simulation test is: first by battery by sinusoidal vibration, then transfers to battery keep more than 6 hours in the environment of vacuum ＜-90Kpa, determines whether leakage or the generation of gas leakage situation by front and back's weight change.
Table 1
Find out from comparing result, lithium ion battery provided herein is combined with the flexible packing material of corrosion-proof layer by employing, resistant to hydrogen fluoric acid ability significantly improves, and can preferably resist electrochemical corrosion, strengthens the safety in utilization of lithium ion battery and increases service life.For increasing safety further, supplement as to bag structure design, on at least one inner surface on bag length direction or width, there is projection, this projection limits the motion of battery core, reducing the battery core impact to bag, reduction bag is pierced through by the metallic bur power on collector thus causes bag to be etched electrochemically or the risk of short circuit.
According to above-mentioned principle, the application can also carry out suitable change and amendment to above-mentioned detailed description of the invention.Therefore, the application is not limited to detailed description of the invention disclosed and described above, should also be as some modifications and changes of the application falling in the protection domain of claims hereof.Although additionally, employ some specific terms in this specification, but these terms are merely for convenience of description, the application is not constituted any restriction.
Claims (9)
1. a lithium ion battery flexible packing material, described lithium ion battery flexible packing material includes substrate layer (10), the first adhesive linkage (11), metal foil layer (12), the second adhesive linkage (13) and the sealant (15) set gradually from outside to inside；It is characterized in that, being provided with one layer of corrosion-proof layer (14) between described sealant and described second adhesive linkage, described corrosion-proof layer is made up of polytetrafluoroethylene film layer；Described corrosion-proof layer is incorporated on described sealant.
Lithium ion battery flexible packing material the most according to claim 1, it is characterised in that the thickness of described corrosion-proof layer is less than the 50% of described sealant thickness.
Lithium ion battery flexible packing material the most according to claim 1, it is characterised in that described corrosion-proof layer is 30～70 μm with the thickness sum of described sealant.
Lithium ion battery flexible packing material the most according to claim 1, it is characterised in that the material of described sealant is the one in polyethylene terephthalate, polrvinyl chloride, polyethylene or polypropylene.
Lithium ion battery flexible packing material the most according to claim 1, it is characterised in that the outside of described substrate layer is additionally provided with decorative layer (16).
Lithium ion battery flexible packing material the most according to claim 1, it is characterised in that described metal foil layer is aluminium foil layer or rustless steel layers of foil.
7. a lithium ion battery, including battery core (2), for the packaging bag (1) accommodating battery core and the electrolyte being poured in packaging bag, it is characterized in that, described packaging bag uses the lithium ion battery flexible packing material described in any one of claim 1 to 6.
Lithium ion battery the most according to claim 7, it is characterised in that at least provided with one to the internal spacing preiection (3) extended of described battery core on the inner surface of described packaging bag.
Lithium ion battery the most according to claim 8, it is characterised in that the height of described spacing preiection is 0.1～0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521131212.XU CN205439418U (en) | 2015-12-29 | 2015-12-29 | Soft packaging material of lithium ion battery and use lithium ion battery of this material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521131212.XU CN205439418U (en) | 2015-12-29 | 2015-12-29 | Soft packaging material of lithium ion battery and use lithium ion battery of this material |
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| CN205439418U true CN205439418U (en) | 2016-08-10 |
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| CN201521131212.XU Active CN205439418U (en) | 2015-12-29 | 2015-12-29 | Soft packaging material of lithium ion battery and use lithium ion battery of this material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107444755A (en) * | 2017-08-24 | 2017-12-08 | 太仓贝斯特机械设备有限公司 | Packing electronic component bag |
| WO2018119869A1 (en) * | 2016-12-29 | 2018-07-05 | 北京旭碳新材料科技有限公司 | Aluminum laminated packaging film, and lithium-ion battery using same |
| CN110370738A (en) * | 2019-06-28 | 2019-10-25 | 佛山佛塑科技集团股份有限公司 | A kind of lithium ion battery flexible packaging film |
| WO2022141260A1 (en) * | 2020-12-30 | 2022-07-07 | 宁德新能源科技有限公司 | Composite foil, battery packaging shell, and battery |
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2015
- 2015-12-29 CN CN201521131212.XU patent/CN205439418U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018119869A1 (en) * | 2016-12-29 | 2018-07-05 | 北京旭碳新材料科技有限公司 | Aluminum laminated packaging film, and lithium-ion battery using same |
| JP2020513357A (en) * | 2016-12-29 | 2020-05-14 | ベイジン トンシュ カーボン アドヴァンスド マテリアルズ テクノロジー カンパニー リミテッドＢｅｉｊｉｎｇ Ｔｕｎｇｈｓｕ Ｃａｒｂｏｎ Ａｄｖａｎｃｅｄ Ｍａｔｅｒｉａｌｓ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ． | Aluminum / plastic encapsulating film and lithium ion battery using the same |
| CN107444755A (en) * | 2017-08-24 | 2017-12-08 | 太仓贝斯特机械设备有限公司 | Packing electronic component bag |
| CN110370738A (en) * | 2019-06-28 | 2019-10-25 | 佛山佛塑科技集团股份有限公司 | A kind of lithium ion battery flexible packaging film |
| WO2022141260A1 (en) * | 2020-12-30 | 2022-07-07 | 宁德新能源科技有限公司 | Composite foil, battery packaging shell, and battery |
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