CN108615828A - The lithium ion battery of lithium ion battery encapsulating film, lithium ion battery packaging method and its preparation - Google Patents
The lithium ion battery of lithium ion battery encapsulating film, lithium ion battery packaging method and its preparation Download PDFInfo
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- CN108615828A CN108615828A CN201810292701.5A CN201810292701A CN108615828A CN 108615828 A CN108615828 A CN 108615828A CN 201810292701 A CN201810292701 A CN 201810292701A CN 108615828 A CN108615828 A CN 108615828A
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- lithium ion
- ion battery
- layer
- battery core
- encapsulating film
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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- 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
-
- 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
Abstract
The present invention provides a kind of lithium ion battery encapsulating film, lithium ion battery packaging method and its lithium ion batteries of preparation, are related to technical field of lithium ion.Above-mentioned lithium ion battery encapsulating film nylon layer, aluminium layer and polypropylene layer by being made of within outer successively.Wherein：Nylon layer can prevent the infiltration of air especially oxygen, ensure that packaging foil has good deformability；Aluminium layer can prevent the infiltration of moisture in air, and the external damage to battery core can be prevented with certain Thickness Strength；Polypropylene in polypropylene layer will not effectively be prevented internal electrolyte etc. from being contacted with aluminium layer, aluminium layer avoided to be corroded by organic solvent dissolving, swelling etc. in battery core.After lithium ion battery encapsulating film of the present invention packs battery core, the problem of battery core internal gas being discharged in advance when aerogenesis is less inside battery core, discharges internal pressure, easily cause battery core thermal runaway to alleviate existing lithium ion battery under the conditions of overcharging.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly, to a kind of lithium ion battery encapsulating film, lithium-ion electric
Pond packaging method and its lithium ion battery of preparation.
Background technology
With the continuous development of lithium ion battery demand, the charge cutoff voltage of battery core is continuously improved in designer, or changes
The structure (such as tertiary cathode material constantly develops to nickelic direction) of material, to realize higher energy density requirement.Raising is filled
Electric blanking voltage changes material and mixes than inevitably making the continuous reduction of the thermal stability of core material.
Overcharge test, it is intended that battery core caused by simulation battery core is possible in the case of the component failures such as charger, protection board
Overcharge situation, this test one is to being that lithium-ion electric core tests difficult point, especially for lacking to explosion-proof valve, fuse etc.
The Soft Roll lithium-ion electric core of structural defence design.When battery core overcharge, the lithium ion in anode is excessively deviate from, and positive knot is caused
Structure caves in, and the structure of unstability is at Strong oxdiative state, and strong oxidation is generated to electrolyte, isolation film.Simultaneously
It is largely precipitated in negative terminal surface from the lithium ion of anode abjection and forms Li dendrite, the lithium of strong reduction-state equally has electrolyte
Reaction.The strong a large amount of heat of redox reaction release of inside battery in this way, along with battery itself produces in charging process
Raw Joule heat causes battery core high temperature to increase, and causes SEI decomposition, internal short-circuit, electrolyte decomposition occur for isolation film melting
Etc. series reactions, to cause battery core thermal failure.
Especially when battery core is under the conditions of overcharging, the electrolyte in battery generates oxygenolysis, the decomposition of SEI films, anode
Material oxygen release etc. will produce a large amount of gas, this makes battery core that serious bulging occur, this will produce following some problems：
(1) battery core bulging is serious, and pole piece, diaphragm deform, when the diaphragm size of deformation can not completely separated positive and negative electrode
When pole piece, positive and negative electrode overlap joint short circuit is easy to cause thermal runaway；
(2) battery core bulging is serious, and battery core internal resistance increases, and the Joule heat for generation of charging is more, when these heats cause diaphragm
When serious thermal contraction, diaphragm can not completely separated positive and negative electrode pole piece when, positive and negative electrode overlap joint short circuit, be easy cause thermal runaway；
(3) battery core bulging is serious, interface degradation between positive and negative electrode, will produce charging local current densities it is excessive, at the position
It is more easy to that thermal runaway occurs, and spreads to battery core entirety.
Therefore, the problem of encountering under environment, the encapsulation to existing lithium ion battery are overcharged above-mentioned according to lithium ion battery
Method is improved research so that and battery core internal gas is discharged when aerogenesis is less inside battery core, discharges internal pressure, it is existing to alleviate
There is the problem of lithium ion battery easily causes battery core thermal runaway under the conditions of overcharging, becomes very necessary and urgent.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of lithium ion battery encapsulating film, uses above-mentioned lithium ion battery encapsulating film
After being packed to battery core, under the conditions of overcharging, battery core internal gas is discharged when aerogenesis is less inside battery core, in release
The problem of pressing, easily causing battery core thermal runaway to alleviate existing lithium ion battery under the conditions of overcharging.
The second object of the present invention is to provide a kind of lithium ion battery packaging method, and this method has technological process letter
Not the advantages that special process equipment not being needed during single, operating cost is low and preparation process.
The third object of the present invention is to provide a kind of lithium ion battery, which is sealed by above-mentioned lithium ion battery
Dress method is prepared, and battery core internal gas can be discharged under the conditions of overcharging, and discharges internal pressure, existing lithium ion is effectively relieved
Battery easily causes the problem of battery core thermal runaway under the conditions of overcharging.
A kind of lithium ion battery encapsulating film provided by the invention, the encapsulating film by within outer successively by nylon layer, aluminium layer
It is formed with polypropylene layer.
Further, the thickness of the nylon layer is 20~30um；
Preferably, the thickness of the aluminium layer is 30~50um；
Preferably, the thickness of the polypropylene layer is 70~90um.
A kind of lithium ion battery packaging method provided by the invention, the packaging method include the following steps：Battery core is put
Enter in above-mentioned lithium ion battery encapsulating film, encapsulating film is folded, the polypropylene layer of innermost layer is opposite, then to outermost layer
Nylon layer carry out heating pressurization, through heat transfer polypropylene layer melted by heat, and under pressure two layers fusing polypropylene
Layer consolute completes encapsulation with postcooling.
Further, the just extremely nickel-cobalt-manganese ternary material of the battery core, cathode are artificial graphite, and the capacity of battery core is 25
~30Ah,
Further, the size of the battery core is thickness 7mm × wide 165mm × long 227mm, side seal width 15mm.
Further, the temperature heated to nylon layer is 120~140 DEG C.
Further, the pressure pressurizeed to nylon layer is 0.05~0.15MPa.
Further, the time that heating pressurization is carried out to nylon layer is 1~3s.
Further, the packaging method specifically includes following steps：
Battery core is put into above-mentioned lithium ion battery encapsulating film, encapsulating film is folded, the polypropylene layer phase of innermost layer
It is right, heating 1~3s of pressurization then is carried out to outermost nylon layer, the pressure of the pressurization is 0.05~0.15MPa, heats
Temperature is 120~140 DEG C, and through heat transfer polypropylene layer melted by heat, and the polypropylene layer of two layers of fusing is mixed under pressure
It is molten, with postcooling, complete encapsulation.
A kind of lithium ion battery provided by the invention, the lithium ion battery are prepared by above-mentioned lithium ion battery packaging method
It obtains.
Compared with prior art, beneficial effects of the present invention are：
Lithium ion battery encapsulating film provided by the invention nylon layer, aluminium layer and polypropylene layer by being made of within outer successively.
Wherein：Nylon layer can prevent the infiltration of air especially oxygen, maintain the environment inside battery core, ensure that packaging foil has well
Deformability；Aluminium layer can prevent the infiltration of moisture in air, maintain the environment inside battery core, have certain Thickness Strength
It can prevent the external damage to battery core；Polypropylene layer will not be battery core inner loop by organic solvent dissolving, swelling etc. in battery core
The most direct packaging protecting in border, insulation effectively prevent internal electrolyte etc. from being contacted with aluminium layer, aluminium layer are avoided to be corroded.This hair
After bright lithium ion battery encapsulating film packs battery core, battery core internal gas can be arranged when aerogenesis is less inside battery core
The problem of going out, discharging internal pressure, easily cause battery core thermal runaway to alleviate existing lithium ion battery under the conditions of overcharging.
Lithium ion battery packaging method provided by the invention is to be put into battery core in above-mentioned lithium ion battery encapsulating film,
Encapsulating film is folded, the polypropylene layer of innermost layer is opposite, then carries out heating pressurization to outermost nylon layer, is passed through heat
Polypropylene layer melted by heat is led, and the polypropylene layer consolute of two layers of fusing completes encapsulation with postcooling under pressure.It should
Special processing is not needed during lithium ion battery packaging method is simple with technological process, operating cost is low and preparation process to set
The advantages that standby.
Lithium ion battery provided by the invention is prepared by above-mentioned lithium ion battery packaging method, passes through above-mentioned encapsulation side
Battery core internal gas can be discharged under the conditions of overcharging for the lithium ion battery that method is prepared, and discharge internal pressure, be effectively relieved existing
There is the problem of lithium ion battery easily causes battery core thermal runaway under the conditions of overcharging.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
It is a part of the embodiment of the present invention to apply example, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
The every other embodiment that art personnel are obtained without making creative work belongs to the model that the present invention protects
It encloses.
According to an aspect of the present invention, a kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by Buddhist nun
Imperial layer, aluminium layer and polypropylene layer composition.
In the present invention, above-mentioned lithium ion battery encapsulating film nylon layer, aluminium layer and polypropylene layer by being made of within outer successively.
Lithium ion battery during reciprocal charging, inside constantly carrying out dynamic electrochemical reaction, it is single outside water, oxygen
When Deng into inside battery, it can be reacted with electrolyte, be quickly generated a large amount of hydrofluoric acid, when fluohydric acid content is excessively high, battery core is electric
Performance (such as capacity, cycle life, discharge platform) can be lost, and seriously affect the use of battery core.
It is packaged using lithium ion battery encapsulating film of the present invention, to completely cut off external environment, aluminum plastic film is mainly by nylon layer
(Nylon), aluminium layer (Al) and polypropylene (PP) layer composition.Wherein each section main function is as follows：
Nylon：The infiltration of air especially oxygen is prevented, the environment inside battery core is maintained, ensures that packaging foil has well
Deformability.
Al：The infiltration of moisture in air is prevented, the environment inside battery core is maintained, there is certain Thickness Strength can prevent
Damage of the outside to battery core.
PP：Will not be the most direct packaging protecting of battery core internal environment by organic solvent dissolving, swelling etc. in battery core,
Insulation effectively prevents internal electrolyte etc. from being contacted with aluminium layer, aluminium layer is avoided to be corroded.
It, can be when aerogenesis be less inside battery core by battery core after lithium ion battery encapsulating film of the present invention packs battery core
Internal gas is discharged, and discharges internal pressure, easily causes asking for battery core thermal runaway under the conditions of overcharging to alleviate existing lithium ion battery
Topic.
In the preferred embodiment of the present invention, the thickness of the nylon layer is 20~30um；
Preferably, the thickness of the aluminium layer is 30~50um；
Preferably, the thickness of the polypropylene layer is 70~90um.
In the present invention, the thickness of above-mentioned nylon layer is typical but non-limiting to be：20um、22um、24um、 26um、28um
Or 30um.
In the present invention, the thickness of above-mentioned aluminium layer is typical but non-limiting to be：30um, 35um, 40um, 45um or 50um.
In the present invention, the thickness of above-mentioned polypropylene layer is typical but non-limiting to be：70um, 75um, 80um, 85um or
90um。
According to an aspect of the present invention, a kind of lithium ion battery packaging method, the packaging method include the following steps：
Battery core is put into above-mentioned lithium ion battery encapsulating film, encapsulating film is folded, the polypropylene layer of innermost layer is opposite, then
Heating pressurization is carried out to outermost nylon layer, through heat transfer polypropylene layer melted by heat, and two layers of fusing under pressure
Polypropylene layer consolute complete encapsulation with postcooling.
Lithium ion battery packaging method provided by the invention is to be put into battery core in above-mentioned lithium ion battery encapsulating film,
Encapsulating film is folded, the polypropylene layer of innermost layer is opposite, then carries out heating pressurization to outermost nylon layer, is passed through heat
Polypropylene layer melted by heat is led, and the polypropylene layer consolute of two layers of fusing completes encapsulation with postcooling under pressure.It should
Special processing is not needed during lithium ion battery packaging method is simple with technological process, operating cost is low and preparation process to set
The advantages that standby.
In the preferred embodiment of the present invention, the just extremely nickel-cobalt-manganese ternary material of the battery core, cathode are behaved
Graphite is made, the capacity of battery core is 25~30Ah.
In the present invention, the capacity of above-mentioned battery core is typical but non-limiting to be：25Ah, 26Ah, 27Ah, 28Ah, 29Ah or
30Ah。
In the preferred embodiment of the present invention, the size of the battery core is 6~8mm of thickness × wide 160~170mm
× length 220~230mm, 13~18mm of side seal width.
Preferably, the size of the battery core is thickness 7mm × wide 165mm × long 227mm, side seal width 15mm.
In the preferred embodiment of the present invention, the temperature heated to nylon layer is 120~140 DEG C.
In the present invention, above-mentioned nylon layer heating temperature is typical but non-limiting to be：120℃、125℃、 130℃、135
DEG C or 140 DEG C.
In the preferred embodiment of the present invention, the pressure pressurizeed to nylon layer be 0.05~
0.15MPa。
In the present invention, above-mentioned nylon layer moulding pressure is typical but non-limiting to be：0.05MPa、 0.08MPa、
0.1MPa, 0.12MPa or 0.15MPa.
In the preferred embodiment of the present invention, the time that heating pressurization is carried out to nylon layer is 1~3s.
In the present invention, the time of above-mentioned nylon layer heating pressurization is typical but non-limiting to be：1s、1.5s、 2s、2.5s
Or 3s.
In the preferred embodiment of the present invention, the packaging method specifically includes following steps：
Battery core is put into above-mentioned lithium ion battery encapsulating film, encapsulating film is folded, the polypropylene layer phase of innermost layer
It is right, heating 1~3s of pressurization then is carried out to outermost nylon layer, the pressure of the pressurization is 0.05~0.15MPa, heats
Temperature is 120~140 DEG C, and through heat transfer polypropylene layer melted by heat, and the polypropylene layer of two layers of fusing is mixed under pressure
It is molten, with postcooling, complete encapsulation.
According to an aspect of the present invention, a kind of lithium ion battery, the lithium ion battery are sealed by above-mentioned lithium ion battery
Dress method is prepared.
Lithium ion battery of the present invention is prepared by above-mentioned lithium ion battery packaging method, is prepared by above-mentioned packaging method
Battery core internal gas can be discharged under the conditions of overcharging for obtained lithium ion battery, discharge internal pressure, be effectively relieved existing lithium from
Sub- battery easily causes the problem of battery core thermal runaway under the conditions of overcharging.
Technical scheme of the present invention is described further below in conjunction with embodiment.
Embodiment 1
A kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by nylon layer, aluminium layer and polypropylene layer group
At；
The thickness of the nylon layer is 20um；The thickness of the aluminium layer is 30um；The thickness of the polypropylene layer is 70um.
Embodiment 2
A kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by nylon layer, aluminium layer and polypropylene layer group
At；
The thickness of the nylon layer is 30um；The thickness of the aluminium layer is 50um；The thickness of the polypropylene layer is 90um.
Embodiment 3
A kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by nylon layer, aluminium layer and polypropylene layer group
At；
The thickness of the nylon layer is 22um；The thickness of the aluminium layer is 35um；The thickness of the polypropylene layer is 75um.
Embodiment 4
A kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by nylon layer, aluminium layer and polypropylene layer group
At；
The thickness of the nylon layer is 28um；The thickness of the aluminium layer is 45um；The thickness of the polypropylene layer is 85um.
Embodiment 5
A kind of lithium ion battery encapsulating film, the encapsulating film by within outer successively by nylon layer, aluminium layer and polypropylene layer group
At；
The thickness of the nylon layer is 25um；The thickness of the aluminium layer is 40um；The thickness of the polypropylene layer is 80um.
Embodiment 6
A kind of lithium ion battery packaging method, the packaging method specifically include following steps：
Battery core is put into lithium ion battery encapsulating film made from embodiment 1, encapsulating film is folded, innermost layer gathers
Propylene layer is opposite, then carries out heating pressurization 1s to outermost nylon layer, and the pressure of the pressurization is 0.05MPa, heats
Temperature is 120 DEG C, through heat transfer polypropylene layer melted by heat, and two layers of polypropylene layer consolute melted under pressure, with
Postcooling completes encapsulation.
Embodiment 7
A kind of lithium ion battery packaging method, the packaging method specifically include following steps：
Battery core is put into lithium ion battery encapsulating film made from embodiment 1, encapsulating film is folded, innermost layer gathers
Propylene layer is opposite, then carries out heating pressurization 1.5s to outermost nylon layer, and the pressure of the pressurization is 0.08MPa, heats
Temperature be 125 DEG C, through heat transfer polypropylene layer melted by heat, and under pressure two layers fusing polypropylene layer consolute,
With postcooling, encapsulation is completed.
Embodiment 8
A kind of lithium ion battery packaging method, the packaging method specifically include following steps：
Battery core is put into lithium ion battery encapsulating film made from embodiment 1, encapsulating film is folded, innermost layer gathers
Propylene layer is opposite, then carries out heating pressurization 2s to outermost nylon layer, and the pressure of the pressurization is 0.1MPa, the temperature of heating
Degree is 130 DEG C, through heat transfer polypropylene layer melted by heat, and two layers of polypropylene layer consolute melted under pressure, then
It is cooling, complete encapsulation.
Embodiment 9
A kind of lithium ion battery packaging method, the packaging method specifically include following steps：
Battery core is put into lithium ion battery encapsulating film made from embodiment 1, encapsulating film is folded, innermost layer gathers
Propylene layer is opposite, then carries out heating pressurization 2.5s to outermost nylon layer, and the pressure of the pressurization is 0.12MPa, heats
Temperature be 135 DEG C, through heat transfer polypropylene layer melted by heat, and under pressure two layers fusing polypropylene layer consolute,
With postcooling, encapsulation is completed.
Embodiment 10
A kind of lithium ion battery packaging method, the packaging method specifically include following steps：
Battery core is put into lithium ion battery encapsulating film made from embodiment 1, encapsulating film is folded, innermost layer gathers
Propylene layer is opposite, then carries out heating pressurization 3s to outermost nylon layer, and the pressure of the pressurization is 0.15MPa, heats
Temperature is 140 DEG C, through heat transfer polypropylene layer melted by heat, and two layers of polypropylene layer consolute melted under pressure, with
Postcooling completes encapsulation.
Experimental example 1
It, can be when aerogenesis be less inside battery core after showing that lithium ion battery encapsulating film of the present invention packs battery core
Battery core internal gas is discharged in advance, internal pressure is discharged, easily causes battery core under the conditions of overcharging to alleviate existing lithium ion battery
The problem of thermal runaway
Existing special envoy is packaged lithium ion battery with 6~10 packaging method of embodiment, and toasted, fluid injection, chemical conversion,
The follow-up battery core manufacturing process such as pumping, partial volume, is made lithium ion battery.Then overcharge charge cutoff is charged to using 1C electric currents
(generally 1.5 times of battery charging upper limit voltage, if battery core charge cutoff voltage is 4.2V, overcharge charging is cut voltage 6.3V
Only voltage is 6.3V), and the charging time reach and stop test after 1h, made from the encapsulation of 6~10 packaging method of the embodiment of the present application
Phenomena such as lithium ion battery cell does not smolder, catches fire, exploding.
In conclusion lithium ion battery encapsulating film provided by the invention by within outer successively by nylon layer, aluminium layer and poly- third
Alkene layer forms.Wherein：Nylon layer can prevent the infiltration of air especially oxygen, maintain the environment inside battery core, ensure packaging aluminium
Foil has good deformability；Aluminium layer can prevent the infiltration of moisture in air, maintain the environment inside battery core, have certain
Thickness Strength can prevent the external damage to battery core；Polypropylene layer will not by battery core organic solvent dissolving, swelling etc., be
The most direct packaging protecting of battery core internal environment, insulation effectively prevent internal electrolyte etc. from being contacted with aluminium layer, avoid aluminium layer quilt
Corrosion.It, can will be in battery core when aerogenesis inside battery core is less after lithium ion battery encapsulating film of the present invention packs battery core
Portion's gas discharge, the problem of discharging internal pressure, easily cause battery core thermal runaway to alleviate existing lithium ion battery under the conditions of overcharging.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of lithium ion battery encapsulating film, which is characterized in that the encapsulating film by within outer successively by nylon layer, aluminium layer and poly-
Propylene layer forms.
2. lithium ion battery encapsulating film according to claim 1, which is characterized in that the thickness of the nylon layer be 20~
30um；
Preferably, the thickness of the aluminium layer is 30~50um；
Preferably, the thickness of the polypropylene layer is 70~90um.
3. a kind of lithium ion battery packaging method, which is characterized in that the packaging method includes the following steps：Battery core is put into power
Profit requires in the lithium ion battery encapsulating film described in 1 or 2, and encapsulating film is folded, and the polypropylene layer of innermost layer is opposite, then
Heating pressurization is carried out to outermost nylon layer, through heat transfer polypropylene layer melted by heat, and two layers of fusing under pressure
Polypropylene layer consolute complete encapsulation with postcooling.
4. lithium ion battery packaging method according to claim 3, which is characterized in that the just extremely nickel cobalt manganese of the battery core
Ternary material, cathode are artificial graphite, and the capacity of battery core is 25~30Ah.
5. lithium ion battery packaging method according to claim 3, which is characterized in that the size of the battery core be thickness 6~
8mm × wide 160~170mm × 220~230mm of length, 13~18mm of side seal width.
6. lithium ion battery packaging method according to claim 5, which is characterized in that described to be heated to nylon layer
Temperature is 120~140 DEG C.
7. lithium ion battery packaging method according to claim 5, which is characterized in that described to pressurize to nylon layer
Pressure is 0.05~0.15MPa.
8. lithium ion battery packaging method according to claim 5, which is characterized in that it is described to nylon layer carry out heating plus
The time of pressure is 1~3s.
9. according to claim 3~8 any one of them lithium ion battery packaging method, which is characterized in that the packaging method
Specifically include following steps：
Battery core is put into lithium ion battery encapsulating film as claimed in claim 1 or 2, encapsulating film is folded, innermost layer
Polypropylene layer is opposite, then carries out heating 1~3s of pressurization to outermost nylon layer, and the pressure of the pressurization is 0.05~
0.15MPa, heating temperature be 120~140 DEG C, through heat transfer polypropylene layer melted by heat, and under pressure two layers it is molten
The polypropylene layer consolute of change completes encapsulation with postcooling.
10. a kind of lithium ion battery, which is characterized in that the lithium ion battery is by 3~9 any one of them of the claims
Lithium ion battery packaging method is prepared.
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| CN201810292701.5A CN108615828A (en) | 2018-03-30 | 2018-03-30 | The lithium ion battery of lithium ion battery encapsulating film, lithium ion battery packaging method and its preparation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635876A (en) * | 2020-12-31 | 2021-04-09 | 远景动力技术(江苏)有限公司 | Battery packaging structure, soft package lithium ion battery comprising battery packaging structure and preparation method |
| CN114379171A (en) * | 2020-10-21 | 2022-04-22 | 宁德新能源科技有限公司 | Packaging film, battery and electronic device |
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| CN112635876A (en) * | 2020-12-31 | 2021-04-09 | 远景动力技术(江苏)有限公司 | Battery packaging structure, soft package lithium ion battery comprising battery packaging structure and preparation method |
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