CN102856583A - Cylindrical coil core explosion-proof lithium ion battery and processing method - Google Patents
Cylindrical coil core explosion-proof lithium ion battery and processing method Download PDFInfo
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- CN102856583A CN102856583A CN2012103827591A CN201210382759A CN102856583A CN 102856583 A CN102856583 A CN 102856583A CN 2012103827591 A CN2012103827591 A CN 2012103827591A CN 201210382759 A CN201210382759 A CN 201210382759A CN 102856583 A CN102856583 A CN 102856583A
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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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- 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 invention discloses a cylindrical coil core explosion-proof lithium ion battery comprising a shell, outer pole lugs, a cylindrical coil core and electrolyte, wherein the cylindrical coil core is composed of a plurality of coil core units, which are connected in parallel, the plurality of coil core units are clamped and fixed by two auxiliary modules of coil core, the shell is packaged by an aluminum-plastic film flexible package bag, two outer pole lugs are hermetically adhered at the bag opening of the aluminum-plastic film flexible package bag, and the pole lugs of all coil core units are connected with the outer pole lugs through corresponding anode and cathode current collectors. The invention further discloses a processing method of the battery. The lithium ion battery and the processing method disclosed by the invention are simple in production technique and low in cost; the safety performance is excellent, and the battery explosion problem is solved; and the advantages of simple technique and high production efficiency of cylindrical coil core batteries are combined, so that the technique is mature and stable, the production cost is low and the production efficiency is high.
Description
Technical field
The invention belongs to cylindrical roll core anti-explosion lithium ion battery and the processing method in lithium ion battery field, particularly a kind of Small And Medium Capacity.
Technical background
Lithium ion battery has been applied to the fields such as energy storage and power more and more with its high voltage, high-energy-density, the good advantages such as cycle performance.At present common lithium ion battery mainly contains metal shell lithium ion battery and plastic shell lithium ion battery from the shell classification; The housing of two kinds of batteries adopts the hard material structure, and improper use causes blast easily, and the external packing cost is high.Mainly contain takeup type and stacked two classes from the battery battery core classification; Stacked shortcoming is complex process, and production cost is high, efficient is low.And takeup type is divided into two kinds of cylinder takeup type (be commonly referred to volume core) and square takeup types, and pluses and minuses are respectively arranged.The coiled advantage of cylinder mainly contains: technical maturity is stable, and cost is low, and production efficiency is high; The pole piece gap is even, high conformity; The pole piece radius of curvature is large, and pole piece is difficult for falling material.These advantages are widely used winding process.But winding process also has its limitation, can not do greatly such as capacity, and reason is that the coiling difficulty increases, rolls up degradation unfavorable factor appearance under the core degree of registration when pole piece is long.The shortcoming of square takeup type volume core is mainly reflected in: square coiled each position difference of volume core radius of curvature causes the pole piece gap inhomogeneous, and at the little place of volume core radius of curvature, the pole piece gap is little, falls easily material.This inconsistency can affect the performance of battery performance.
Battery diaphragm refers to one deck diaphragm material between anode and negative pole, it is part very crucial in the battery, battery security and cost are had a direct impact, its Main Function is: the isolation positive and negative electrode also makes the electronics in the battery not pass freely through, and allows the ion in the electrolyte freely pass through between both positive and negative polarity.Battery diaphragm the ionic conduction ability be directly connected to the overall performance of battery; effect of its isolation both positive and negative polarity make battery overcharge or situation that temperature raises under can Limited Current rising; prevent that battery short circuit from setting off an explosion; have the self-closing protective effect of micropore, battery user and equipment are played the effect of safeguard protection.The conventional barrier film of present used in battery normally adopts polyethylene, polypropylene preparation, exists in actual use the not good easy short circuit of insulation effect, ion to spread defective undesirable and that intensity is relatively poor.
Summary of the invention
Purpose of the present invention is exactly the problem that exists for prior art, and a kind of cost is low, production efficiency is high cylindrical roll core anti-explosion lithium ion battery and processing method thereof are provided.
Its technical scheme: a kind of cylindrical roll core anti-explosion lithium ion battery comprises shell, outer lug, cylindrical roll core and electrolyte.Wherein: the cylindrical roll core is connected in parallel by a plurality of volume core units and forms, a plurality of volume core units are gripped therein by two volume core supplementary modules, shell adopts the aluminum plastic film soft packaging bag, outer lug is after being adhesively fixed with the lug connecting plate of PP material on the sack encapsulating face of aluminum plastic film outer packaging bag, the sealed sack place that is bonded in the aluminum plastic film soft packaging bag, the lug of all volume core units by correspondence just, negative current collector is connected with outer lug, volume core supplementary module is the soft rubber material of PP material or electrolyte resistance corrosion, plus plate current-collecting body is aluminium strip, negative current collector is copper strips or nickel strap, described volume core supplementary module arranges slot at its blind end, plus plate current-collecting body, negative current collector is pegged graft respectively and is fixed in end slot corresponding to volume core supplementary module.
Described volume core supplementary module is that two volume core supplementary modules are along the axially rectangular structure to being combined into of volume core, its inside is provided with and the cylindrical groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.
Described volume core supplementary module is that two volume core supplementary modules are along the rectangular structure of neighboring to being combined into of volume core, its inside is provided with and the arc groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects; Two volume core supplementary modules comprise upper and lower butted structure and left and right butted structure along the involutory mode in neighboring of rolling up core.
Sack place at the aluminum plastic film outer packaging bag is shaped with liquid injection port in advance, and the number of cylindrical roll core is 2～4.
Barrier film in the described volume core composed as follows: take the barrier film of polypropylene, polyethylene material as matrix, the coating that is formed by polymeric colloid material and inorganic filler in the matrix surface coating; The mixture that described polymeric colloid material is comprised of Kynoar, vinylidene fluoride-hexafluoropropylene copolymer, polyacrylonitrile and polymethyl methacrylate; Described inorganic filler is a kind of or its compositions of mixtures by nanometer-level inorganic powder material alundum (Al2O3), silicon dioxide.
The barrier film matrix of described polypropylene, polyethylene material is selected polypropylene microporous film or three layers of composite microporous separator of polypropylene, polyethylene/polypropylene; Described inorganic filler granularity is 50nm-200nm; Described barrier film coating layer thickness is 1-5 μ m; Process is coated with the barrier film porosity of polymeric colloid material and inorganic filler processing between 30%-50%; Described barrier film coating layer thickness is preferably 2-3 μ m.The weight of described inorganic filler accounts for the 30%-100% of coated polymeric colloidal materials weight.
Kynoar in the polymeric colloid material, vinylidene fluoride-hexafluoropropylene copolymer account for the 40%-70% of overall polymeric colloid material weight; Polyacrylonitrile accounts for the 5%-20% of overall polymeric colloid material weight; Polymethyl methacrylate accounts for the 10%-40% of overall polymeric colloid material weight; Polymeric colloid material solvent for use is selected from one or more of following solvent: butanone, acetone, oxolane, 1-METHYLPYRROLIDONE, ethyl acetate, ethanol, diethyl carbonate, butanols.
The processing method of aforesaid cylindrical roll core anti-explosion lithium ion battery comprises the steps:
1. the positive and negative lug that will roll up core unit adopts the form of ultrasonic bonding to be welded on the positive and negative electrode collector;
2. will roll up core and positive and negative electrode collector and insert in two volume core supplementary modules, the positive and negative electrode collector is drawn in volume core supplementary module slot;
3. connect after the projection of two volume core supplementary modules and the groove contraposition, will roll up core, roll up the core supplementary module and be assembled together;
4. the both positive and negative polarity collector is taked the form of laser welding or ultrasonic bonding to be welded on the outer lug;
5. paste protective tapes at both positive and negative polarity collector outer surface;
6. the volume core that will assemble is inserted in the aluminum plastic film outer packaging bag;
7. lug and aluminum plastic film packing bag mouth contact position are coated with one deck glue outside, outer lug is encapsulated with aluminum plastic film packaging bag high temperature extrusion, and reserve liquid injection port;
8. at last battery is carried out fluid injection, changes into rear sealing liquid injection port.
Lithium ion battery of the present invention and processing method, the lithium ion battery of the hard shells such as metal or plastics of comparing, have the following advantages: (1) production technology is simple, and cost is low.The lithium ion battery of hard shell, the takeup type cylindrical lithium ion battery of metal shell (take box hat 18650 cylindrical batteries as example) particularly, need to carry out a series of complicated technology flow processs such as negative lug and housing bottom welding, slot rolling, positive pole ear and block welding, sealing, increase production cost.The soft bag lithium ionic cell technique of aluminum plastic film packing is relatively simple, and the cost of raw material also is lower than the lithium ion battery of metal shell.(2) security performance is better than the lithium ion battery of hard shell.The lithium ion battery of hard shell is in the situation of improper use, and the inner hyperbar that produces easily causes battery explosion.And aluminum plastic film packing air pressure resistance intensity is low, has solved the problem of battery explosion.(3) combine the advantage that cylindrical roll core battery process is simple, production efficiency is high, technical maturity is stable, and production cost is low, and production efficiency is high.Battery separator of the present invention is gel polymer electrolyte film simultaneously, it adopts take Kynoar, vinylidene fluoride-hexafluoropropylene copolymer electrolyte colloid as matrix, the imbibition ability, the ionic conduction ability that add polyacrylonitrile, polymethyl methacrylate, inorganic nano level powder body material raising colloid, adopting the barrier film of polypropylene, polyethylene material is the matrix of polymeric colloid, has solved polymer dielectric colloid film mechanical strength problem rambunctious.The content that the present invention adjusts Kynoar, vinylidene fluoride-hexafluoropropylene copolymer improves membrane surface polymeric colloid adhesive property and polymer amorphous substance content, adds imbibition ability, the ionic conduction ability of polyacrylonitrile, polymethyl methacrylate, inorganic nano level powder body material raising colloid.To sum up this barrier film has improved the anti-short circuit of battery, anti-acupuncture, shock resistance, anti-extrusion ability, and then improves and improved the security performance of lithium ion battery.
Description of drawings
Fig. 1 be a kind of embodiment partly cut open structural representation.
Fig. 2 is a kind of volume core supplementary module three-view diagram, and wherein Fig. 2 a is right view, and Fig. 2 b is front view, and Fig. 2 c is vertical view.
Fig. 3 is the installation diagram of another kind of volume core supplementary module.
Embodiment
Below in conjunction with drawings and Examples, its technical scheme is clearly and completely described.
Embodiment 1, comprises shell, outer lug 1, cylindrical roll core 7 and electrolyte.Wherein: cylindrical roll core 7 is connected in parallel by two volume core units and forms, two volume core units are gripped therein by two volume core supplementary modules 8, shell adopts aluminum plastic film soft packaging bag 9, two outer lug 1 sealed sack places that are bonded in aluminum plastic film soft packaging bag 9, the lug 6 of all volume core units is connected with outer lug 1 by corresponding both positive and negative polarity collector 5.Volume core supplementary module 8 is the soft rubber material of PP material or electrolyte resistance corrosion, and the preferred number of cylindrical roll core 7 is 2～4.Be shaped with in advance lug connecting plate 3 on the sack encapsulating face of lug 1 and aluminum plastic film outer packaging bag 9 outside, material is the PP material, is used for connecting and fixing lug, is convenient to aluminum plastic film to the sealing of volume core supplementary module.Sack place at the aluminum plastic film outer packaging bag is shaped with liquid injection port 2 in advance.
Embodiment 2, with reference to accompanying drawing 2, on the basis of embodiment 1, the auxiliary mould 8 of described volume core be two volume core supplementary modules 8 along the axially rectangular structure to being combined into of volume cores, its inside is provided with and the cylindrical groove of rolling up core 7 and pegging graft and cooperating.Two volume core supplementary modules 8 are provided with projection 8-1 and the groove 8-2 that mutual grafting cooperates at its involutory surface, and projection and groove play the effect of fixing two volume core supplementary modules.Volume core supplementary module is provided with inside and outside through hole or the groove 8-4 that connects, as the passage of battery core fluid injection.Volume core supplementary module 8 arranges 4 in the slot 8-3(corresponding diagram 1 at its blind end), plus plate current-collecting body, negative current collector 5 are pegged graft respectively and are fixed in the end slot 8-3 of volume core supplementary module 8 correspondences.
Embodiment 3, with reference to accompanying drawing 3, and in conjunction with the embodiments 2, volume core supplementary module can also adopt two volume core supplementary modules 8 rectangular structure of neighboring to being combined into along volume cores 7, and its inside is provided with and the arc groove of rolling up core 7 and pegging graft and cooperate.
Preferably: outer lug is nickel strap or the aluminium strip that is converted into L-type, and the lower end knuckle is convenient to be welded with the both positive and negative polarity collector.In order to increase the tightness between outer lug and the aluminum plastic film packaging material, lug and aluminum plastic film packaging material contact position are coated with one deck glue outside.Volume core supplementary module can protect the volume core to avoid the damage of the external force such as extruding force, impact force.Played again simultaneously the effect of auxiliary fluid injection, made electrolyte can fully infiltrate the volume core.
Processing method around above-mentioned battery is:
1. the mode according to the cylindrical roll core is ready to roll up core unit, adopts the form of ultrasonic bonding to be welded on the positive and negative electrode collector the positive and negative lug of rolling up core unit;
2. will roll up core and positive and negative electrode collector and insert in two volume core supplementary modules, the positive and negative electrode collector is drawn in volume core supplementary module slot;
3. connect after the projection of two volume core supplementary modules and the groove contraposition, will roll up core, roll up the core supplementary module and be assembled together;
4. the both positive and negative polarity collector is taked the form of laser welding or ultrasonic bonding to be welded on the outer lug;
5. paste protective tapes at both positive and negative polarity collector outer surface;
6. the volume core that will assemble is inserted in the aluminum plastic film outer packaging bag;
7. lug and aluminum plastic film packing bag mouth contact position are coated with one deck glue outside, improve the sealing between outer lug and the aluminum plastic film packaging material, outer lug is encapsulated with aluminum plastic film packaging bag high temperature extrusion, and reserve liquid injection port;
8. at last battery is carried out fluid injection, changes into rear sealing liquid injection port.
Several exemplary embodiments of the barrier film preparation that the volume core adopts among the present invention below are provided.
Embodiment 4
3000g Kynoar, 6000g vinylidene fluoride-hexafluoropropylene copolymer, 800g polyacrylonitrile, 5000g polymethyl methacrylate are dissolved in 50000g acetone, 2000g ethyl acetate, the 1000g alcohol solvent, solution temperature 40-80 ℃, add again the 2500g alundum (Al2O3), 2500g silicon dioxide carries out dispersed with stirring, makes thick slurry.The thick slurry that will prepare with coating device is coated on the polypropylene microporous film, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
With the 3000g Kynoar, the 3000g vinylidene fluoride-hexafluoropropylene copolymer, the 800g polyacrylonitrile, the 4500g polymethyl methacrylate is dissolved into 15000g acetone, the 15000g oxolane, 2000g ethyl acetate, in the 1000g alcohol solvent, solution temperature 40-80 ℃, add again the 5000g alundum (Al2O3) and carry out dispersed with stirring, make thick slurry, the thick slurry that to make with coating device is coated in polypropylene, on the barrier film of polyethylene material, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
Embodiment 6
With the 4000g Kynoar, the 6000g vinylidene fluoride-hexafluoropropylene copolymer, the 800g polyacrylonitrile, the 5000g polymethyl methacrylate is dissolved into the 50000g 1-METHYLPYRROLIDONE, 2000g ethyl acetate, in the 1000g alcohol solvent, solution temperature 40-80 ℃, add again the 6000g alundum (Al2O3) and carry out dispersed with stirring, make thick slurry, the thick slurry that to make with coating device is coated in polypropylene, on the barrier film of polyethylene material, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
Embodiment 7
With the 4000g Kynoar, the 6000g vinylidene fluoride-hexafluoropropylene copolymer, the 800g polyacrylonitrile, the 5000g polymethyl methacrylate is dissolved into the 25000g butanone, the 25000g oxolane, the 1000g diethyl carbonate, 1000g ethyl acetate, in the 1000g butanols solvent, solution temperature 40-80 ℃, add again the 3500g alundum (Al2O3), 2500g silicon dioxide carries out dispersed with stirring, make thick slurry, the thick slurry that to make with coating device is coated in polypropylene, on the barrier film of polyethylene material, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
With the 5000g Kynoar, the 4000g vinylidene fluoride-hexafluoropropylene copolymer, the 800g polyacrylonitrile, the 5000g polymethyl methacrylate is dissolved into the 25000g butanone, the 25000g oxolane, the 1000g diethyl carbonate, 1000g ethyl acetate, in the 1000g butanols solvent, solution temperature 40-80 ℃, add again 6500g silicon dioxide and carry out dispersed with stirring, make thick slurry, the thick slurry that to make with coating device is coated in polypropylene, on the barrier film of polyethylene material, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
Embodiment 9
With the 3000g Kynoar, the 6000g vinylidene fluoride-hexafluoropropylene copolymer, the 800g polyacrylonitrile, the 5000g polymethyl methacrylate is dissolved into the 50000g 1-METHYLPYRROLIDONE, the 1000g diethyl carbonate, 1000g ethyl acetate, in the 1000g butanols solvent, solution temperature 40-80 ℃, add again the 7500g alundum (Al2O3) and carry out dispersed with stirring, make thick slurry, the thick slurry that to make with coating device is coated in polypropylene, on the barrier film of polyethylene material, the barrier film of coating slurry is dried in the coating device baking oven, barrier film after the oven dry is through 80 ℃ of vacuum bakeouts, remove residual solvent, just obtain the used barrier film of volume core in the previous embodiment, according to lithium-ion-power cell manufacturer demand, barrier film can be made the different in width barrier film through cutting.
For the above-mentioned explanation of the disclosed embodiments, only be preferred embodiment of the present invention, be not to limit practical range of the present invention.Be that every equivalence of doing according to the content in the present patent application claim changes and modification, all should be technology category of the present invention.
Claims (10)
1. cylindrical roll core anti-explosion lithium ion battery, comprise shell, outer lug, cylindrical roll core and electrolyte, it is characterized in that: the cylindrical roll core is connected in parallel by a plurality of volume core units and forms, a plurality of volume core units are gripped therein by two volume core supplementary modules, shell adopts the aluminum plastic film soft packaging bag, outer lug is after being adhesively fixed with the lug connecting plate of PP material on the sack encapsulating face of aluminum plastic film outer packaging bag, the sealed sack place that is bonded in the aluminum plastic film soft packaging bag, the lug of all volume core units by correspondence just, negative current collector is connected with outer lug, volume core supplementary module is the soft rubber material of PP material or electrolyte resistance corrosion, plus plate current-collecting body is aluminium strip, negative current collector is copper strips or nickel strap, described volume core supplementary module arranges slot at its blind end, plus plate current-collecting body, negative current collector is pegged graft respectively and is fixed in end slot corresponding to volume core supplementary module.
2. cylindrical roll core anti-explosion lithium ion battery according to claim 1, it is characterized in that: described volume core supplementary module is that two volume core supplementary modules are along the axially rectangular structure to being combined into of volume core, its inside is provided with and the cylindrical groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.
3. cylindrical roll core anti-explosion lithium ion battery according to claim 1, it is characterized in that: described volume core supplementary module is that two volume core supplementary modules are along the rectangular structure of neighboring to being combined into of volume core, its inside is provided with and the arc groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects; Two volume core supplementary modules comprise upper and lower butted structure and left and right butted structure along the involutory mode in neighboring of rolling up core.
4. according to claim 2 or 3 described cylindrical roll core anti-explosion lithium ion batteries, it is characterized in that: the sack place at the aluminum plastic film outer packaging bag is shaped with liquid injection port in advance, and the number of cylindrical roll core is 2～4.
5. cylindrical roll core anti-explosion lithium ion battery according to claim 1, it is characterized in that: the barrier film in the described volume core composed as follows: take the barrier film of polypropylene, polyethylene material as matrix, the coating that is formed by polymeric colloid material and inorganic filler in the matrix surface coating; The mixture that described polymeric colloid material is comprised of Kynoar, vinylidene fluoride-hexafluoropropylene copolymer, polyacrylonitrile and polymethyl methacrylate; Described inorganic filler is a kind of or its compositions of mixtures by nanometer-level inorganic powder material alundum (Al2O3), silicon dioxide.
6. cylindrical roll core anti-explosion lithium ion battery according to claim 5, it is characterized in that: the barrier film matrix of described polypropylene, polyethylene material is selected polypropylene microporous film or three layers of composite microporous separator of polypropylene, polyethylene/polypropylene; Described inorganic filler granularity is 50nm-200nm; Described barrier film coating layer thickness is 1-5 μ m; Process is coated with the barrier film porosity of polymeric colloid material and inorganic filler processing between 30%-50%; Described barrier film coating layer thickness is preferably 2-3 μ m.
7. cylindrical roll core anti-explosion lithium ion battery according to claim 6, it is characterized in that: the weight of inorganic filler accounts for the 30%-100% of coated polymeric colloidal materials weight.
8. cylindrical roll core anti-explosion lithium ion battery according to claim 7, it is characterized in that: the Kynoar in the polymeric colloid material, vinylidene fluoride-hexafluoropropylene copolymer account for the 40%-70% of overall polymeric colloid material weight; Polyacrylonitrile accounts for the 5%-20% of overall polymeric colloid material weight; Polymethyl methacrylate accounts for the 10%-40% of overall polymeric colloid material weight.
9. cylindrical roll core anti-explosion lithium ion battery according to claim 7, it is characterized in that: polymeric colloid material solvent for use is selected from one or more of following solvent: butanone, acetone, oxolane, 1-METHYLPYRROLIDONE, ethyl acetate, ethanol, diethyl carbonate, butanols.
10. according to the processing method of the described cylindrical roll core of the arbitrary claim of 4-9 anti-explosion lithium ion battery, it is characterized in that comprising the steps:
Adopt the form of ultrasonic bonding to be welded on the positive and negative electrode collector the positive and negative lug of volume core unit;
To roll up core and positive and negative electrode collector and insert in two volume core supplementary modules, the positive and negative electrode collector is drawn in volume core supplementary module slot;
Connect after the projection of two volume core supplementary modules and the groove contraposition, will roll up core, roll up the core supplementary module and be assembled together;
Take the form of laser welding or ultrasonic bonding to be welded on the outer lug both positive and negative polarity collector;
Paste protective tapes at both positive and negative polarity collector outer surface;
The volume core that assembles is inserted in the aluminum plastic film outer packaging bag;
Lug and aluminum plastic film packing bag mouth contact position are coated with one deck glue outside, outer lug is encapsulated with aluminum plastic film packaging bag high temperature extrusion, and reserve liquid injection port;
(8) at last battery is carried out fluid injection, changes into rear sealing liquid injection port.
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| CN107706460A (en) * | 2017-09-30 | 2018-02-16 | 苏州博众精工科技有限公司 | The battery core film-making coiling all-in-one of Protection glue is pasted at a high speed |
| CN108054320A (en) * | 2017-12-25 | 2018-05-18 | 陈益德 | Dry cell sale box |
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Application publication date: 20130102 |