CN104157914A - High-power flexible packaged lithium ion battery and processing process thereof - Google Patents
High-power flexible packaged lithium ion battery and processing process thereof Download PDFInfo
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- CN104157914A CN104157914A CN201410443798.7A CN201410443798A CN104157914A CN 104157914 A CN104157914 A CN 104157914A CN 201410443798 A CN201410443798 A CN 201410443798A CN 104157914 A CN104157914 A CN 104157914A
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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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
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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 relates to a high-power flexible packaged lithium ion battery and a processing process thereof. An individual battery cell comprises a negative plate, a positive plate, a first membrane and a second membrane, wherein the first membrane, the negative plate, the second membrane and the positive plate are stacked in sequence; the positive plate is arranged in an innermost layer and formed by winding. According to the lithium ion battery, a first positive island region and a second positive island region which are not coated with active substances are arranged in a certain distance on the two sides of a positive tab; during winding, the second positive island region and the first positive island region are used for correspondingly wrapping a negative tab and the rear surface of the negative tab respectively, so that the lithium separation when the positive active substances are over against the negative tab is avoided. According to the preparation method, the battery is hotly and coldly pressed before formation, and excess electrolyte in the battery is squeezed into an airbag, so that the hardness of the battery is improved, the layers of membranes, the positive plate and the negative plate are in relatively close contact with each other, the interface impedance and the internal resistance of the battery are reduced, and the power energy density of the lithium ion battery is increased.
Description
Technical field
The invention belongs to lithium ion battery field, relate to a kind of lithium ion battery and manufacture craft thereof, relate in particular to a kind of high power flexible packing lithium ion battery and manufacture craft thereof.
Background technology
For meeting the requirement of market for large capacity version motive power flexible package lithium ion, the in the situation that of strict control pole piece surface density, need to realize by increasing pole piece length.But to adopting the power lithium-ion battery of winding process, the long meeting of pole piece brings unnecessary trouble to production process, causes product fraction defective to rise, and adopts the internal resistance of cell of long pole piece large, be unfavorable for the high current charge-discharge of electrokinetic cell, seriously hinder the raising of its power energy density.
In Chinese patent literature CN203119046U, mention a kind of pole piece structure that positive pole ear is placed in to positive plate centre, reduce lithium ion battery internal resistance, solve cycle performance of lithium ion battery poor, the problem that consistency is poor.But the method negative pole does not adopt lug to be placed in the middle structure of pole piece reduces DeGrain to the internal resistance of cell.In Chinese patent literature CN202905842U, mention a kind of positive and negative lug and be all welded on the middle pole piece structure of pole piece, further reduce the internal resistance of cell, improve battery efficiency and useful life.In these two patents, positive plate lug right-hand member certain distance and anode ear welding position reverse side left end certain distance, all do not arrange one without the blank foil district that applies active material, be referred to as in industry " island district " while avoiding negative electrode lug to reel just to positive pole material district, such pole piece structure can cause battery to produce afterwards a series of thermal runaway phenomenon of analysing lithium phenomenon and cause in charging, reduces battery security.Therefore, be necessary to arrange in this position Yi Duandao district, the fail safe that improves battery.
The both positive and negative polarity pole piece of flexible packing lithium ion battery, barrier film is cellular diaphragm structure, there is certain imbibition ability, after fluid injection can there is separation between layers because imbibition produce to expand in standing a period of time, cause barrier film to contact defective tightness with pole piece, interface impedance is increased, while changing into, interfacial reaction is inhomogeneous, be unfavorable for that negative terminal surface forms fine and close solid electrolyte interface film (SEI film), in addition can there is air-generating reaction in formation process, more aggravate the generation of this adverse effect, in the time that formation voltage exceedes 3.95V, the place that negative terminal surface SEI film is loose can produce analyses lithium phenomenon, can bring potential safety hazard to electrokinetic cell on the one hand, increase the internal resistance of cell, on the other hand because flexible packing lithium ion battery shell is the softer aluminum plastic film of material, battery core shows more obviously in the deformation of 3.9-4.1V compared with aluminium/lithium-ion battery with steel shell, need in this voltage range, carry out hot fixture shaping to battery core changing into after end, discharge inside battery stress, eliminate battery core metaboly.And analyse lithium phenomenon by formation voltage being reduced to when 3.95V avoids changing into, be unfavorable for the hot fixture shaping effect of battery.Therefore, for reducing the large capacity version flexible packaging power lithium ion internal resistance of cell, improve its power energy density, improve battery core metaboly, be necessary before flexible packing lithium ion battery changes into, by certain way by inside battery between layers comparatively fluffy contact become more tight.
Summary of the invention
The present invention is directed to the defect and the deficiency that in above-mentioned prior art, exist, a kind of high-power energy density flexible packing lithium ion battery and manufacturing process thereof are provided.
Term explanation:
Island district: island of the present invention district is term known in this field, refers to after electric core winding, and positive anticathode tab welding position positive and negative on anode pole piece band does not apply the blank foil district of positive active material.
Coating line: coating line of the present invention is term known in this field, refers to island district or edge, clear area, i.e. the critical place of active material and pole piece band.
Technical scheme of the present invention is as follows:
A kind of coiling monomer battery core, this monomer battery core comprises that negative plate, positive plate, the first barrier film and the second barrier film the order according to the first barrier film, negative plate, the second barrier film, positive plate stack, and positive plate is at innermost layer, and coiling makes;
When monomer battery core is launched, described positive plate comprises anode pole piece band, the both sides of described anode pole piece band are provided with positive active material, one side of described anode pole piece band is provided with positive pole ear, anodal the first island district and anodal the first clear area, and the opposite side of described anode pole piece band is provided with anodal the second island district, anodal the second clear area and anodal the 3rd clear area; Described positive pole ear and anodal the second clear area are positioned at the centre position of anode pole piece band and are oppositely arranged, and described positive pole the first island district and anodal the second island district lay respectively at the both sides of positive pole ear; Described positive pole the first clear area and anodal the 3rd clear area are positioned at the both sides of anode pole piece band and are arranged on the end of anode pole piece band;
Described negative plate comprises cathode pole piece band, and the both sides of described cathode pole piece band are provided with negative electrode active material, the both sides of described cathode pole piece band and be positioned at centre position place and be relatively set with negative lug and negative pole clear area.
According to the present invention, preferred, described positive pole the first island offset is from positive pole ear 0-270mm, and described positive pole the second island offset is from anodal the second clear area 0-270mm.
According to the present invention, preferred, described positive pole ear and the width of negative lug are 5-70mm, and thickness is 0.1-0.2mm.
According to the present invention, preferred, described positive pole the first island district and anodal the second island sector width are 13-80mm.
According to the present invention, preferred, described positive pole the first clear area width is 0-220mm, and described positive pole the 3rd clear area width is 15-620mm.
According to the present invention, preferred, described positive pole the second clear area and the width of negative pole clear area are 6-75mm.
According to the present invention, preferred, described anode pole piece band is aluminium foil material, and described cathode pole piece band is Copper Foil material.
According to the present invention, preferred, described positive pole ear is aluminium material, and described negative lug is nickel, copper or copper nickel plating material.
According to the present invention, preferably, described positive pole the first island district, anodal the first clear area, anodal the second island district and anodal the 3rd clear area are provided with polyethylene terephthalate insulating adhesive tape, insulating tape thickness is 0.02-0.04mm, insulating tape width is than the wide 0.5-1mm of width of anodal the first island district, anodal the first clear area, anodal the second island district and anodal the 3rd clear area, the long 2-8mm of length of anodal the first island district of insulating tape Length Ratio, anodal the first clear area, anodal the second island district and anodal the 3rd clear area; Described positive pole the second clear area is provided with polyethylene terephthalate insulating adhesive tape, insulating tape thickness is 0.02-0.04mm, anodal the second blank head of district 2-8mm of insulating tape Length Ratio, insulating tape width is than the wide 2.5-6.5mm of anodal the second clear area width.
According to the present invention, preferably, only in anodal the first coating line position, island district, anodal the first coating line position, clear area, anodal the second coating line position, island district and anodal the 3rd coating line position, clear area arrange polyethylene terephthalate insulating adhesive tape, insulating tape touch coating line both sides 2-8mm.
According to the present invention, preferably, described negative pole clear area is provided with polyimides acrylic insulating tape, and insulating tape thickness is 0.055-0.065mm, the width of insulating tape is than the wide 2-8mm of the width of negative pole clear area, the long 1.5-5.5mm of length of the Length Ratio negative pole clear area of insulating tape.
According to the present invention, preferred, described positive pole ear and negative lug expose 10-20mm, and exposed parts is respectively arranged with tab, and tab is apart from the edge 1.5-2.5mm of anode pole piece band or cathode pole piece band; Tab material is yellow glue, white glue or black glue.
According to the present invention, described positive active material and negative electrode active material are this area conventional ingredient, preferably, described positive active material is LiMn2O4, conductive agent and the binding agent slurry after being uniformly mixed, and described negative electrode active material is Delanium, conductive agent and the binding agent slurry after being uniformly mixed.
According to the present invention, a kind of high power flexible packing lithium ion battery, inside battery comprises at least one above-mentioned coiling monomer battery core, preferred, the number of coiling monomer battery core is 2, composes in parallel two volume core batteries.Coiling monomer battery core can be through pressing core to make rectangular lithium ion battery.
According to the present invention, a kind of preparation method of high power flexible packing lithium ion battery, step is as follows:
(1) by LiMn2O4, carbon black conductive agent (SP), binding agent Kynoar (PVDF) according to (90-100): (2-4): quality proportioning (1-3) stirs, make slip, obtain positive active material;
By Delanium, carbon black conductive agent (SP), binding agent sodium carboxymethylcellulose (CMC), thickener styrene butadiene rubbers (SBR) according to (94-97): (0.5-2): (1-2): quality proportioning (1-3) stirs, make slip, obtain negative electrode active material;
(2) positive active material and negative electrode active material are coated in respectively to the surface of anode pole piece band and the surface of cathode pole piece band, wherein, positive pole ear place, anodal the first island district, anodal the first clear area, anodal the second island district, anodal the second clear area and anodal the 3rd clear area do not apply positive active material; Negative lug place and negative pole clear area do not apply negative electrode active material;
The coating density of described positive active material is 160-210g/m
2,
The coating density of described negative electrode active material is 60-100g/m
2;
Then, drying, roll-in and cut, weld the lug with tab by positive pole ear place and negative lug place, or welding not the lug with tab for making compound lithium ion battery core, obtain positive plate and negative plate;
(3) stack by the order of the first barrier film, negative plate, the second barrier film, positive plate, positive plate is at innermost layer, step (2) is made to negative plate and positive plate and reel with the first barrier film and the second barrier film, anode pole piece band and cathode pole piece band all face up and place coiling core to be welded with one of lug;
The first described barrier film and the second barrier film are the barrier film of polypropylene diaphragm, polyethylene barrier film, ceramic coated polypropylene diaphragm, Kynoar (PVDF) coating polypropylene diaphragm or polypropylene-polyethylene-polypropylene three-layer-material composition, the complete monomer battery core of must reeling of reeling;
Or, by parallel at least two above-mentioned coiling monomer battery core welding, use insulating tape to fix, obtain compound lithium ion battery core;
(4) the coiling monomer battery core or the compound lithium ion battery core that step (3) are obtained are colded pressing, are changed into through encapsulation, vacuum bakeout, fluid injection, heat, to obtain final product;
Described hot pressing and the parameter of colding pressing are as follows:
Hot pressing: surface pressure 1-6kgf/cm
2, press core quantity 2-16 only, hot pressing temperature 60-80 DEG C, hot pressing time 20-180S at every turn;
Cold pressing: surface pressure 1-6kgf/cm
2, press core quantity 2-16 only at every turn, the temperature of colding pressing 25-30 DEG C, time 20-180S colds pressing.
According to the present invention, preferred, the coating density of the positive active material described in step (2) is 180-185g/m
2, the coating density of described negative electrode active material is 65-70g/m
2.
According to the present invention, preferably, after the middle surface of anode pole piece band of step (2) and the surface-coated active material of cathode pole piece band, anodal the first island district, anodal the first clear area, polyethylene terephthalate insulating adhesive tape is pasted in anodal the second island district and anodal the 3rd clear area, insulating tape thickness is 0.02-0.04mm, insulating tape width is than anodal the first island district, anodal the first clear area, the wide 0.5-1mm of width of anodal the second island district and anodal the 3rd clear area, anodal the first island district of insulating tape Length Ratio, anodal the first clear area, the long 2-8mm of length of anodal the second island district and anodal the 3rd clear area, polyethylene terephthalate insulating adhesive tape is pasted in anodal the second clear area, and insulating tape thickness is 0.02-0.04mm, anodal the second blank head of district 2-8mm of insulating tape Length Ratio, and insulating tape width is than the wide 2.5-6.5mm of anodal the second clear area width,
Polyimides acrylic insulating tape is pasted in negative pole clear area, and insulating tape thickness is 0.055-0.065mm, the long 2-8mm of length of the Length Ratio negative pole clear area of insulating tape, and the width of insulating tape is than the wide 1.5-5.5mm of the width of negative pole clear area.
According to the present invention, preferred, in step (3), the mode of at least two coiling monomer battery core welding in parallel is by ultrasonic bonding.When coiling, positive plate is at innermost layer, and with positive plate ending, after coiling finishes, the outermost layer that is exposed at volume core is the 3rd clear area on anode pole piece band.
According to the present invention, electrolyte is the conventional electrolyte in this area, preferably, electrolyte solvent described in step (4) is the mixed system of ethylene carbonate (EC), diethyl carbonate (DEC) and carbonic acid Methylethyl ester (EMC), and electrolyte is lithium hexafluoro phosphate (LiPF
6), and adding 1,2-vinylene carbonate (VC) as additive, reservoir quantity is according to 4.0g/Ah ± 0.1g note.
Preferred, after changing into, also comprise secondary encapsulation and partial volume step.
High power flexible packing lithium ion battery of the present invention inside comprises at least one coiling monomer battery core, each coiling monomer battery core is all respectively arranged with positive pole ear and negative lug, and be arranged on the centre position of anode pole piece band and cathode pole piece band, wherein said anode pole piece band is provided with anodal the first island district and anodal the second island district, it can effectively reduce the internal resistance of cell in the situation that ensureing that battery capacity is constant, improves its fail safe.
Beneficial effect of the present invention is as follows:
1, inside lithium ion cell of the present invention comprises at least one coiling monomer battery core, each coiling monomer battery core is all respectively arranged with positive and negative lug, the identical lug of wherein said monomer battery core polarity is by the mode of the ultrasonic bonding formation composite battery core that is welded as a whole, the internal resistance of cell is low, and power energy density is high.
2, lithium ion battery of the present invention arranges one section without positive pole the first island district and anodal the second island district that apply active material in a distance, positive pole ear both sides, when coiling, anodal the second island district and anodal the first island district are corresponding and wrap up the back side of negative lug and negative lug respectively, avoid the positive anticathode lug of positive active material and produce and analyse lithium.
3, in the preparation method of high power flexible packing lithium ion battery of the present invention, cold pressing by battery being carried out to heat before changing into, electrolyte unnecessary in battery is clamp-oned to air bag, improve battery hardness, make each layer of barrier film, positive plate and negative plate contact tightr, battery interface impedance reduces, and to reduce the internal resistance of cell, improves the power energy density of lithium ion battery.
4, lay respectively at the centre position of anode pole piece band and cathode pole piece band due to positive pole ear of the present invention and negative lug, and anode pole piece band arranges different Dao district, two positions, thereby ensureing on the basis that flexible packing lithium ion battery capacity is constant, can effectively reduce the internal resistance of cell, quantity of heat production while reducing battery discharge, can improve again the high rate performance of battery, can also avoid battery to analyse lithium from improving its fail safe.
Brief description of the drawings
Generalized section when Fig. 1 is the embodiment of the present invention 1 coiling monomer battery core positive plate expansion.
Generalized section when Fig. 2 is the embodiment of the present invention 1 coiling monomer battery core negative plate expansion.
Fig. 3 is the perspective view of the embodiment of the present invention 2 compound lithium ion battery cores.
Fig. 4 is the 3C discharge curve that the embodiment of the present invention 5 and comparative example 1-2 make the battery obtaining.
Wherein, 11-anode pole piece band, 12-positive active material, 13-positive pole ear, anodal the first island district of 14-, anodal the first clear area of 15-, anodal the second island district of 16-, anodal the second clear area of 17-, anodal the 3rd clear area of 18-;
21-cathode pole piece band, 22-negative electrode active material, 23-negative lug, 24-negative pole clear area;
31-monomer battery core, 32-insulating tape, 33-compound lithium ion battery core anode ear, 34-compound lithium ion battery core negative electrode lug, 35-tab, 36-weld.
Embodiment
In order to understand better the present invention, describe technical scheme of the present invention in detail with instantiation below, but the present invention is not limited thereto.
In embodiment, positive active material 12 is LiMn2O4: conductive agent SP: the slurry that binding agent PVDF mixes according to the proportioning of 95:3:2, negative electrode active material 22 is Delanium: conductive agent SP: binding agent CMC: the slurry that thickener SBR mixes according to the proportioning of 95.4:1:1.6:2, coiling monomer battery core capacity is 5Ah.
The solvent of electrolyte is the mixed system of ethylene carbonate (EC), diethyl carbonate (DEC) and carbonic acid Methylethyl ester (EMC), and electrolyte is lithium hexafluoro phosphate (LiPF
6), and add 1,2-vinylene carbonate (VC) as additive.
Embodiment 1, coiling monomer battery core
A kind of coiling monomer battery core, this monomer battery core comprises that negative plate, positive plate, the first barrier film and the second barrier film the order according to the first barrier film, negative plate, the second barrier film, positive plate stack, and positive plate is at innermost layer, and coiling makes;
When monomer battery core is launched, described positive plate comprises anode pole piece band 11, evenly there is positive active material 12 both sides of described anode pole piece band 11, one side of described anode pole piece band 11 is provided with positive pole ear 13, anodal the first island district 14 and anodal the first clear area 15, and the opposite side of described anode pole piece band 11 is provided with anodal the second island district 16, anodal the second clear area 17 and anodal the 3rd clear area 18; Described positive pole ear 13 and anodal the second clear area 17 are positioned at the centre position of anode pole piece band 11 and are oppositely arranged, and described positive pole the first island district 14 and anodal the second island district 16 lay respectively at the both sides of positive pole ear 13; Described positive pole the first clear area 15 and anodal the 3rd clear area 18 are positioned at the both sides of anode pole piece band 11 and are arranged on the end of anode pole piece band 11;
Described negative plate comprises cathode pole piece band 21, and the both sides of described cathode pole piece band 21 are evenly provided with negative electrode active material 22, the both sides of described cathode pole piece band 21 and be positioned at centre position place and be relatively set with negative lug 23 and negative pole clear area 24.
In the present embodiment, described positive pole the first island district 14 is 32mm with the distance of positive pole ear 13, and described positive pole the second island district 16 is 32mm with the distance of anodal the second clear area 17;
Described positive pole ear 13 and the width of negative lug 23 are 15mm, and thickness is 0.2mm;
Described positive pole the first island district 14 and anodal the second island district 16 width are 35mm;
Described positive pole the first clear area 15 width are 58mm, and described positive pole the 3rd clear area 18 width are 180mm;
Described positive pole the second clear area 17 and the width of negative pole clear area 24 are 24mm;
Described anode pole piece band 11 is aluminium foil material, and described cathode pole piece band 21 is Copper Foil material;
Described positive pole ear 13 is aluminium material, and described negative lug 23 is copper nickel plating material;
Described 14 coating line positions, positive pole the first island district, 15 coating line positions, anodal the first clear area, 16 coating line positions, anodal the second island district and 18 coating line positions, anodal the 3rd clear area are provided with polyethylene terephthalate (PET) insulating tape, insulating tape thickness is 0.02mm, insulating tape touch coating line both sides 5mm, and insulating tape width is than the wide 1mm of width of anodal the first island district 14, anodal the first clear area 15, anodal the second island district 16 and anodal the 3rd clear area 18; Anodal the second clear area 17 is provided with polyethylene terephthalate insulating adhesive tape, and insulating tape thickness is 0.02-0.04mm, anodal the second long 6mm in clear area 17 of insulating tape Length Ratio, and insulating tape width is than the wide 2.5mm of anodal the second clear area 17 width;
Described negative pole clear area 24 is provided with polyimides acrylic insulating tape, and insulating tape thickness is 0.055mm, the long 6mm of length of the Length Ratio negative pole clear area 24 of insulating tape, and the width of insulating tape is than the wide 1.5mm of the width of negative pole clear area 24;
Described positive pole ear 13 and negative lug 23 expose outside 20mm, and exposed parts arranges respectively tab.Tab is apart from the edge 2mm of anode pole piece band 11 or cathode pole piece band 21; Tab material is yellow glue;
On anode pole piece band 11, positive active material 12 coated side density are 185mg/cm
2, on cathode pole piece band 21, negative electrode active material 22 coated side density are 76mg/cm
2.
Embodiment 2, compound lithium ion battery core
After the coiling monomer battery core parallel connection that the battery core that the present embodiment makes is made by two embodiment 1, obtain, time in parallel, place according to the order of lug " left just right negative ", rear capacity in parallel is 10Ah.
Embodiment 3, coiling monomer battery core
The monomer battery core of reeling is as described in Example 1 different:
Described positive pole the first island district 14 is 270mm with the distance of positive pole ear 13, and described positive pole the second island district 16 is 270mm with the distance of anodal the second clear area 17;
Described positive pole ear 13 and the width of negative lug 23 are 70mm, and thickness is 0.2mm;
Described positive pole the first island district 14 and anodal the second island district 16 width are 80mm;
Described positive pole the first clear area 15 width are 220mm, and described positive pole the 3rd clear area 18 width are 620mm;
Described positive pole the second clear area 17 and the width of negative pole clear area 24 are 75mm;
Described negative lug 23 is copper material;
On anode pole piece band 11, positive active material 12 coated side density are 210mg/cm
2, on cathode pole piece band 21, negative electrode active material 22 coated side density are 100mg/cm
2.
Embodiment 4, coiling monomer battery core
The monomer battery core of reeling is as described in Example 1 different:
Described positive pole the first island district 14 is 10mm with the distance of positive pole ear 13, and described positive pole the second island district 16 is 10mm with the distance of anodal the second clear area 17;
Described positive pole ear 13 and the width of negative lug 23 are 5mm, and thickness is 0.1mm;
Described positive pole the first island district 14 and anodal the second island district 16 width are 13mm;
Described positive pole the first clear area 15 width are 10mm, and described positive pole the 3rd clear area 18 width are 15mm;
Described positive pole the second clear area 17 and the width of negative pole clear area 24 are 6mm;
Described negative lug 23 is nickel material;
On anode pole piece band 11, positive active material 12 coated side density are 160mg/cm
2, on cathode pole piece band 21, negative electrode active material 22 coated side density are 60mg/cm
2.
Embodiment 5
A preparation method for high power flexible packing lithium ion battery, comprises the compound lithium ion battery core using described in embodiment 2, and step is as follows:
(1) LiMn2O4, conductive agent SP, binding agent PVDF are stirred according to the proportioning of 95:3:2, make slip, obtain positive active material 12;
Delanium, conductive agent SP, binding agent CMC, thickener SBR are stirred according to the proportioning of 95.4:1:1.6:2, make slip, obtain negative electrode active material 22;
(2) positive active material 12 and negative electrode active material 22 are coated in respectively to the surface of anode pole piece band 11 and the surface of cathode pole piece band 21, wherein, positive pole ear 13 places, anodal the first island district 14, anodal the first clear area 15, anodal the second island district 16, anodal the second clear area 17 and anodal the 3rd clear area 18 do not apply positive active material 12; Negative lug 23 places and negative pole clear area 24 do not apply negative electrode active material 22;
After the surface-coated active material of the surface of anode pole piece band 11 and cathode pole piece band 21,14 coating line positions, anodal the first island district, 15 coating line positions, anodal the first clear area, 16 coating line positions, anodal the second island district and 18 coating line positions, anodal the 3rd clear area are provided with polyethylene terephthalate (PET) insulating tape, insulating tape thickness is 0.02mm, insulating tape touch coating line both sides 5mm, and insulating tape width is than the wide 1mm of width of anodal the first island district 14, anodal the first clear area 15, anodal the second island district 16 and anodal the 3rd clear area 18; Anodal the second clear area 17 is provided with polyethylene terephthalate insulating adhesive tape, and insulating tape thickness is 0.02-0.04mm, anodal the second long 6mm in clear area 17 of insulating tape Length Ratio, and insulating tape width is than the wide 2.5mm of anodal the second clear area 17 width;
Described negative pole clear area 24 is provided with polyimides acrylic insulating tape, and insulating tape thickness is 0.055mm, the long 6mm of length of the Length Ratio negative pole clear area 24 of insulating tape, and the width of insulating tape is than the wide 1.5mm of the width of negative pole clear area 24;
The coating density of described positive active material 12 is 185g/m
2,
The coating density of described negative electrode active material 22 is 76g/m
2;
Then, drying, roll-in and cut, by positive pole ear 13 places and negative lug 23 places welding not the lug with tab for making compound lithium ion battery core, obtain positive plate and negative plate;
(3) stack by the order of the first barrier film, negative plate, the second barrier film, positive plate, positive plate is at innermost layer, step (2) is made to negative plate and same the first barrier film of positive plate and the second barrier film reels, anode pole piece band 11 and cathode pole piece band 21 all face up and place coiling core to be welded with one of lug, finish up with positive plate, after coiling finishes, the outermost layer that is exposed at volume core is the 3rd clear area 18 of anode pole piece band 11;
Described barrier film material is polypropylene, the complete monomer battery core of must reeling of reeling;
The coiling monomer battery core that two steps (3) are obtained is by the mode parallel connection of ultrasonic bonding, and uses insulating tape to fix, and obtains compound lithium ion battery core;
As shown in Figure 3: when welding, compound lithium ion battery core anode ear 33 and compound lithium ion battery core negative electrode lug 34 heads are placed down, and tab 35 top edges are apart from barrier film top edge 1 ± 0.5mm; After lug welding in parallel finishes, compound lithium ion battery core anode ear 33 and compound lithium ion battery core negative electrode lug 34 are turned down upward, prune weld 36 with scissors, unnecessary lug is cut, make weld 36 just in time concordant with battery core 31 edges of outermost end; Insulating tapes 32 are pasted in weld 36 lower ends, and insulating tape 32 is than the wide 1-2mm of weld 36, and weld 36 are fixed on and roll up core upper end with insulating tape 32;
(4) Combined roll step (3) being obtained is colded pressing, is changed into through encapsulation, 80 DEG C of vacuum bakeouts, fluid injection, heat around monomer battery core, and secondary encapsulation, partial volume, to obtain final product;
Described reservoir quantity is 39.9～40.1g
Described hot pressing and the parameter of colding pressing are as shown in table 1:
Table 1
| Press core mode | Pressure (kgf) | Temperature (DEG C) | Time (S) | Press core quantity (PCS) |
| Hot pressing | 663 | 75 | 40 | 2 |
| Cold pressing | 663 | 25 | 70 | 2 |
Comparative example 1
The preparation method of high power flexible packing lithium ion battery as described in Example 5, different, in step (5), do not carry out the heat operation of colding pressing.
Comparative example 2
The monomer battery core of reeling as described in Example 1, different is that described positive pole ear 13 and negative lug 23 is separately positioned on described anode pole piece band 11 and the end of cathode pole piece band 21.
By the step of embodiment 5, the coiling monomer battery core of this comparative example is made to flexible packing lithium ion battery.
Experimental example
The flexible packing lithium ion battery that embodiment 5, comparative example 1 and comparative example 2 are made carries out electrical performance data test, and result is as table 2, shown in Fig. 4.
Three kinds of embodiment of table 2 make battery electrical property data mean value
Known by table 2 Data Comparison, the flexible packing lithium ion battery internal resistance that the present invention makes is less, and power energy density is higher.
Known by the different battery 3C of Fig. 4 discharge curve, high rate performance when high-power energy density flexible packing lithium ion battery heavy-current discharge that the present invention makes is better.
Claims (10)
1. a coiling monomer battery core, is characterized in that, this monomer battery core comprises that negative plate, positive plate, the first barrier film and the second barrier film the order according to the first barrier film, negative plate, the second barrier film, positive plate stack, and positive plate is at innermost layer, and coiling makes;
When monomer battery core is launched, described positive plate comprises anode pole piece band, the both sides of described anode pole piece band are provided with positive active material, one side of described anode pole piece band is provided with positive pole ear, anodal the first island district and anodal the first clear area, and the opposite side of described anode pole piece band is provided with anodal the second island district, anodal the second clear area and anodal the 3rd clear area; Described positive pole ear and anodal the second clear area are positioned at the centre position of anode pole piece band and are oppositely arranged, and described positive pole the first island district and anodal the second island district lay respectively at the both sides of positive pole ear; Described positive pole the first clear area and anodal the 3rd clear area are positioned at the both sides of anode pole piece band and are arranged on the end of anode pole piece band;
Described negative plate comprises cathode pole piece band, and the both sides of described cathode pole piece band are provided with negative electrode active material, the both sides of described cathode pole piece band and be positioned at centre position place and be relatively set with negative lug and negative pole clear area.
2. coiling monomer battery core according to claim 1, is characterized in that, described positive pole the first island offset is from positive pole ear 0-270mm, and described positive pole the second island offset is from anodal the second clear area 0-270mm.
3. coiling monomer battery core according to claim 1, is characterized in that, described positive pole ear and the width of negative lug are 5-70mm, and thickness is 0.1-0.2mm;
Described positive pole the first island district and anodal the second island sector width are 13-80mm;
Described positive pole the first clear area width is 0-220mm, and described positive pole the 3rd clear area width is 15-620mm;
Described positive pole the second clear area and the width of negative pole clear area are 6-75mm.
4. coiling monomer battery core according to claim 1, is characterized in that, described anode pole piece band is aluminium foil material, and described cathode pole piece band is Copper Foil material;
Described positive pole ear is aluminium material, and described negative lug is nickel, copper or copper nickel plating material.
5. coiling monomer battery core according to claim 1, it is characterized in that, described positive pole the first island district, anodal the first clear area, anodal the second island district and anodal the 3rd clear area are provided with polyethylene terephthalate insulating adhesive tape, insulating tape thickness is 0.02-0.04mm, insulating tape width is than the wide 0.5-1mm of width of anodal the first island district, anodal the first clear area, anodal the second island district and anodal the 3rd clear area, the long 2-8mm of length of anodal the first island district of insulating tape Length Ratio, anodal the first clear area, anodal the second island district and anodal the 3rd clear area; Described positive pole the second clear area is provided with polyethylene terephthalate insulating adhesive tape, insulating tape thickness is 0.02-0.04mm, anodal the second blank head of district 2-8mm of insulating tape Length Ratio, insulating tape width is than the wide 2.5-6.5mm of anodal the second clear area width;
Described negative pole clear area is provided with polyimides acrylic insulating tape, and insulating tape thickness is 0.055-0.065mm, the long 2-8mm of length of the Length Ratio negative pole clear area of insulating tape, and the width of insulating tape is than the wide 1.5-5.5mm of the width of negative pole clear area.
6. coiling monomer battery core according to claim 1, is characterized in that, described positive pole ear and negative lug expose 10-20mm, and exposed parts is respectively arranged with tab, and tab is apart from the edge 1.5-2.5mm of anode pole piece band or cathode pole piece band; Tab material is yellow glue, white glue or black glue.
7. a high power flexible packing lithium ion battery, inside battery comprises the coiling monomer battery core described at least one claim 1-6 any one.
8. a preparation method for high power flexible packing lithium ion battery, step is as follows:
(1) by LiMn2O4, carbon black conductive agent, binding agent Kynoar according to (90-100): (2-4): quality proportioning (1-3) stirs, and makes slip, obtains positive active material;
By Delanium, carbon black conductive agent, binding agent sodium carboxymethylcellulose, thickener styrene butadiene rubbers according to (94-97): (0.5-2): (1-2): quality proportioning (1-3) stirs, make slip, obtain negative electrode active material;
(2) positive active material and negative electrode active material are coated in respectively to the surface of anode pole piece band and the surface of cathode pole piece band, wherein, positive pole ear place, anodal the first island district, anodal the first clear area, anodal the second island district, anodal the second clear area and anodal the 3rd clear area do not apply positive active material; Negative lug place and negative pole clear area do not apply negative electrode active material;
The coating density of described positive active material is 160-210g/m
2,
The coating density of described negative electrode active material is 60-100g/m
2;
Then, drying, roll-in and cut, weld the lug with tab by positive pole ear place and negative lug place, or welding not the lug with tab for making compound lithium ion battery core, obtain positive plate and negative plate;
(3) stack by the order of the first barrier film, negative plate, the second barrier film, positive plate, positive plate is at innermost layer, step (2) is made to negative plate and positive plate and reel with the first barrier film and the second barrier film, anode pole piece band and cathode pole piece band all face up and place coiling core to be welded with one of lug;
The first described barrier film and the second barrier film are the barrier film of polypropylene diaphragm, polyethylene barrier film, ceramic coated polypropylene diaphragm, ceramic coated polyethylene barrier film, Kynoar coating polypropylene diaphragm, Kynoar coating polyethylene barrier film or polypropylene-polyethylene-polypropylene three-layer-material composition, the complete monomer battery core of must reeling of reeling;
Or, by parallel at least two above-mentioned coiling monomer battery core welding, use insulating tape to fix, obtain compound lithium ion battery core;
(4) the coiling monomer battery core or the compound lithium ion battery core that step (3) are obtained are colded pressing, are changed into through encapsulation, vacuum bakeout, fluid injection, heat, to obtain final product;
Described hot pressing and the parameter of colding pressing are as follows:
Hot pressing: surface pressure 1-6kgf/cm
2, press core quantity 2-16 only, hot pressing temperature 60-80 DEG C, hot pressing time 20-180S at every turn;
Cold pressing: surface pressure 1-6kgf/cm
2, press core quantity 2-16 only at every turn, the temperature of colding pressing 25-30 DEG C, time 20-180S colds pressing.
9. the preparation method of high power flexible packing lithium ion battery according to claim 8, it is characterized in that, after the middle surface of anode pole piece band of step (2) and the surface-coated active material of cathode pole piece band, anodal the first island district, anodal the first clear area, polyethylene terephthalate insulating adhesive tape is pasted in anodal the second island district and anodal the 3rd clear area, insulating tape thickness is 0.02-0.04mm, insulating tape width is than anodal the first island district, anodal the first clear area, the wide 0.5-1mm of width of anodal the second island district and anodal the 3rd clear area, anodal the first island district of insulating tape Length Ratio, anodal the first clear area, the long 2-8mm of length of anodal the second island district and anodal the 3rd clear area, polyethylene terephthalate insulating adhesive tape is pasted in anodal the second clear area, and insulating tape thickness is 0.02-0.04mm, anodal the second blank head of district 2-8mm of insulating tape Length Ratio, and insulating tape width is than the wide 2.5-6.5mm of anodal the second clear area width,
Polyimides acrylic insulating tape is pasted in negative pole clear area, and insulating tape thickness is 0.055-0.065mm, the long 2-8mm of length of the Length Ratio negative pole clear area of insulating tape, and the width of insulating tape is than the wide 1.5-5.5mm of the width of negative pole clear area.
10. the preparation method of high power flexible packing lithium ion battery according to claim 8, it is characterized in that, electrolyte solvent described in step (4) is the mixed system of ethylene carbonate, diethyl carbonate and carbonic acid Methylethyl ester, electrolyte is lithium hexafluoro phosphate, and add 1,2-vinylene carbonate is as additive, and reservoir quantity is according to 4.0g/Ah ± 0.1g note.
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| CN114759315B (en) * | 2021-01-08 | 2023-09-08 | 孚能科技(赣州)股份有限公司 | Manufacturing method of battery tab |
| CN113285133A (en) * | 2021-05-24 | 2021-08-20 | 中南大学 | In-situ test device and test method for potential distribution of lithium ion battery |
| CN113381058B (en) * | 2021-06-09 | 2023-10-31 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| WO2022257746A1 (en) * | 2021-06-09 | 2022-12-15 | 珠海冠宇电池股份有限公司 | Lithium-ion battery |
| CN113381058A (en) * | 2021-06-09 | 2021-09-10 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| CN113611818A (en) * | 2021-07-09 | 2021-11-05 | 深圳市浩然电池有限公司 | Lithium ion battery pole piece structure |
| WO2023000312A1 (en) * | 2021-07-23 | 2023-01-26 | 宁德新能源科技有限公司 | Cell and electrical device |
| CN113571756A (en) * | 2021-07-26 | 2021-10-29 | 珠海冠宇电池股份有限公司 | Battery cell manufacturing method and battery cell |
| CN114171714A (en) * | 2021-11-11 | 2022-03-11 | 深圳市量能科技有限公司 | High-rate battery positive plate and lithium ion battery |
| CN114156522A (en) * | 2021-12-02 | 2022-03-08 | 天津市捷威动力工业有限公司 | Hot-pressing compounding process of low-internal-resistance and high-magnification VDA 590 model soft-package battery cell |
| CN114447276B (en) * | 2022-04-11 | 2022-07-19 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114447276A (en) * | 2022-04-11 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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