CN103811768B - Pit affluxion body in lithium ion batteries and preparation method thereof and equipment - Google Patents
Pit affluxion body in lithium ion batteries and preparation method thereof and equipment Download PDFInfo
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- CN103811768B CN103811768B CN201410063502.9A CN201410063502A CN103811768B CN 103811768 B CN103811768 B CN 103811768B CN 201410063502 A CN201410063502 A CN 201410063502A CN 103811768 B CN103811768 B CN 103811768B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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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
Abstract
A kind of pit affluxion body in lithium ion batteries and preparation method thereof and equipment, wherein manufacture method is: when collector passes through the roll compacting station between left-hand roll and dextrad roll, left-hand back-up sand bucket above left-hand roll is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and the dextrad back-up sand bucket above dextrad roll inserts hardness be greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, described particle is made to form right side pit at the opposite side of collector.In the present invention, pit affluxion body in lithium ion batteries active material and collection liquid surface increase contact-making surface, increase active material and afflux body surface adhered area, favourable enhancing adhesion strength, thus increase contact electric conductivity, it is simple that back-up sand milling method manufactures concave surface affluxion body in lithium ion batteries technique, is applicable to large-scale industrial production.
Description
Technical field
The present invention relates to a kind of lithium ion battery material and preparation method thereof and equipment, particularly one side or pit affluxion body in lithium ion batteries and preparation method thereof and equipment.
Background technology
Lithium ion battery is made up of positive electrode, negative material, collector, barrier film, electrolyte and shell etc., described collector is positive electrode and negative material slurry coating attachment carrier, also be the conductor device of positive electrode and negative material simultaneously, collector adopts Copper Foil or aluminium foil manufacture usually, in order to obtain less contact resistance, selected Copper Foil is fine copper material, and selected aluminium foil equally also adopts fine aluminium material.Along with pure electric automobile development, powerful requirement is proposed to the discharge power of lithium ion battery, the increase of discharge power, collector and positive pole, namely the contact conductive current of collector and negative material increases, existing collector has highlighted the characteristic along with the heat production of discharge-rate increase battery increases, a this heat production part comes from positive electrode and negative material, some is from the contact resistance of positive electrode and negative material and collector, the contact resistance of positive electrode and negative material and collector is larger, heat production will be more serious, reduce positive electrode, the contact resistance of negative material and collector, for the discharge-rate improving lithium ion battery, there is important practical significance.But, no matter existing collector is adopt cathode copper manufacture, or calender roll is made and is all belonged to planar structure, collector smooth flat is made to become male and fomale(M&F) in existing collector plane by methods such as processing blind hole by laser, chemical corrosion, electrolytic etchings, thus reach the contact conductive area increasing collector and positive pole, collector and negative material, after increasing conductive area, the contact resistance of positive electrode and negative material and collector reduces, after contact resistance reduces, large multiplying power discharging heat production will in improvement.
Document is recorded:
Chemical method is adopted to etch aluminum foil current collector surface, and then chemical deposition layer of metal film on collection liquid surface after the etching, modification is carried out to aluminum foil current collector, make the transmission resistance of electronics between collector and active material greatly reduce [Zhang Baohong etc., modified current collector on double layer capacitor performance affect power technology 2007. 31(7) 538-542].
Adopt laser processing preparation table mask to have the copper current collector of blind hole, the copper current collector and ganoid copper current collector with blind hole are made electrode slice, and be assembled into button cell and carry out charge and discharge cycles test.Compared with ganoid copper current collector, Porous Cu collector demonstrates performance advantage.Voltage-capacity curve shows, the collector with blind hole can holding electrode structure, and then ensures less interface contact resistance.Result shows: Porous Cu collector can improve cycle performance and coulombic efficiency [Tang Xingxian, the preparation of blind hole copper current collector and improvement China YouSe Acta Metallurgica Sinica (English edition) 2013 23(6 to silica-based anode circulation performance thereof) 1,723 1727].
After electrolytic etching process is carried out on the surface of negative current collector copper foil of lithium ion battery, surface defines uniform gully formula structure, Copper Foil can be contacted more closely with negative material, improve interfacial mechanical adhesion and conductivity, cushion lithium and negative active core-shell material reacts the electrode change in volume caused, decrease the generation of SEI film, the first charge-discharge efficiency of nano pure silicone powder and micro crystal graphite and the specific discharge capacity of circulation is made to be obtained for raising, battery performance makes moderate progress [Fan Xing, electrolytic etching copper foil of affluxion body anticathode performance affect battery 2009 39(3) 131-136].
By carrying out direct current etching processing to affluxion body in lithium ion batteries aluminium foil surface, improve the interface state of collector, active material and aluminium collection liquid surface mutually " engagement ", enhance the contact performance of active material and collector.Positive active material actual specific capacity and cyclical stability are all improved [Wang Lizhen, etc.: direct current etching aluminium collector is to LiCoO
2cathode performance affect battery 2008 38(5) 300-304].
The surperficial surface compared with shiny copper foil of hair side of hair surface copper foil, hair side surface is more coarse, the reducing degree of electrolyte on hair surface copper foil surface comparatively strong [Tang Zhiyuan etc.: the shadow corrosion science of Copper Foil As Cathode Current Collector On Performance of Li-ion Batteries and guard technology 2007 19(4) 265-269].
Above-mentioned achievement in research be confirmed increase collection liquid surface can improve performance of lithium ion battery, but in method described in document, it is large that laser processing preparation table mask has the collector of blind hole to there is equipment investment, production cost is high, the problem high to the technical requirement of operating personnel, is difficult to marketing; Chemical corrosion and metal etch method process collection liquid surface is adopted to exist big for environment pollution, and the problem that complex process production efficiency is low.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide that a kind of equipment investment is little, production cost is low to society, not high to the technical requirement of operating personnel; Environment is not polluted, and high pit affluxion body in lithium ion batteries of technique simple production efficiency and preparation method thereof and equipment.
Technical scheme of the present invention is: provide a kind of pit affluxion body in lithium ion batteries to society, and be provided with pit at least one side of described collector, described pit is formed in described collector is by the process of heat transfer.
Improve as to the present invention, described collector by the process of heat transfer is: when described collector passes through the roll compacting station between left-hand roll and dextrad roll, left-hand back-up sand bucket above left-hand roll is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the roll compacting of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and the dextrad back-up sand bucket above dextrad roll inserts hardness be greater than the particle of current collector material hardness between collector and dextrad roll, along with the roll compacting of dextrad roll, described particle is made to form right side pit at the opposite side of collector.
Improve as to the present invention, described particle is zircon sand particle or ceramic microsphere, and its average grain diameter is selected in 2 ~ 4 microns.
Improve as to the present invention, described collector by the process of heat transfer is: when described collector passes through the roll compacting station between left-hand roll and dextrad roll, left salient point on left-hand roll, along with the roll compacting of left-hand roll, makes described left salient point form left side pit in the side of collector; Or/and the right salient point above dextrad roll is along with the roll compacting of dextrad roll, described right salient point is made to form right side pit at the opposite side of collector.
Improve as to the present invention, the average diameter of described salient point is selected in 2 ~ 4 microns.
The present invention also provides a kind of milling method of pit affluxion body in lithium ion batteries, when collector is by heat transfer, looks unfamiliar into pit at least one of collector simultaneously.
Improve as to the present invention, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, left-hand back-up sand bucket above left-hand roll is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and the dextrad back-up sand bucket above dextrad roll inserts hardness be greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, described particle is made to form right side pit at the opposite side of collector.
Improve as to the present invention, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, the left salient point on left-hand roll, along with the extruding of left-hand roll, makes described left salient point form left side pit in the side of collector; Or/and the right salient point above dextrad roll is along with the extruding of dextrad roll, described right salient point is made to form right side pit at the opposite side of collector.
The present invention also provides a kind of equipment preparing pit affluxion body in lithium ion batteries, comprise the left-hand roll for rolling collector and dextrad roll, left-hand back-up sand bucket is provided with above described left-hand roll, when rolling collector, described left-hand back-up sand bucket is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and be provided with dextrad back-up sand bucket above described dextrad roll, when rolling collector, described dextrad back-up sand bucket is inserted hardness and is greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, makes described particle form right side pit in the side of collector.
The present invention also provides another kind to prepare the equipment of pit affluxion body in lithium ion batteries, comprise the left-hand roll for rolling collector and dextrad roll, described left-hand roll is provided with left salient point, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, left salient point on left-hand roll, along with the extruding of left-hand roll, makes described left salient point form left side pit in the side of collector; Or/and be provided with right salient point on described dextrad roll, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, right salient point above dextrad roll, along with the extruding of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
Left salient point in the present invention or/and right salient point preferably account for roller surface long-pending more than 50%.Left salient point, or/and right salient point can adopt laser to be formed on roller surface, in order to ensure that the hardness of roller surface is greater than collector, can carry out cure process in first breaker roll surface, then, then forming required left salient point or/and right salient point with laser.
The present invention adopts back-up sand milling method to manufacture pit affluxion body in lithium ion batteries.
The sand that described back-up sand adopts, selects zircon sand or ceramic microsphere, preferred zircon sand.
Described collector is the contact conductive devices of lithium ion cell positive or negative electrode active material, and what positive pole adopted is aluminium foil, and graphite cathode is adopted as Copper Foil.
The object that back-up sand milling method in the present invention manufactures pit affluxion body in lithium ion batteries is the pit gathered at collector plane machining, the plane of collector increases the interface state that namely pit gathered improves collector, make active material and collection liquid surface increase contact-making surface, enhance the contact electric conductivity of active material and collector.
Back-up sand milling method is: collector by during roll compacting station between left-hand roll and dextrad roll simultaneously, be positioned at the left-hand back-up sand bucket above left-hand roll and dextrad roll, dextrad back-up sand bucket synchronously inserts zircon sand, zircon sand fills between roll and collector, collector and zircon sand are simultaneously by roll compacting, roll pressed zircon sand, zircon sand extruding collector, because collector material is fine copper or fine aluminium, the hardness comparing collector due to zircon sand differs greatly, the hardness HRb=10 of the fine copper HOO trade mark, aluminium foil 3003H18 trade mark hardness HB=50, the hardness of zircon sand is HV=12Gpa, when roll roll compacting zircon sand, zircon sand extruding collector, collector generation pit is out of shape, the degree of depth of pit and the pit mouth size of pit, determined by the size of zircon sand.In the present invention, described zircon sand also can replace with ceramic microsphere.
According to Copper Foil 9 ~ 16 micron thickness that existing affluxion body in lithium ion batteries adopts usually, aluminium foil 15 ~ 30 micron thickness adopted, select the degree of depth of pit and the pit mouth size of pit to need to avoid collector to be punctured perforation by the zircon sand of roll compacting causes tensile property to reduce simultaneously, the degree of depth of pit distortion must be controlled, 1/20 ~ 1/10 of the degree of depth choice set fluid thickness of pit, after roll compacting, pit distribution accounts for more than 50% of the surface of whole collector, and it is more than 2.5 times of roll compacting frontal plane that collection liquid surface amasss; In the present invention, the degree of depth of described pit selects 1 ~ 2 micron, preferably 1.5 microns, the average diameter of particles size Selection of zircon sand 2 ~ 4 microns, preferably 3 microns, the particle zircon sand of 3 micron diameters is pressed into collector tissue with more than 50%, form dark 1.5 microns of pit, pit mouth size 3 microns.
Pit affluxion body in lithium ion batteries active material and collection liquid surface increase contact-making surface, increase active material and afflux body surface adhered area, favourable enhancing adhesion strength, thus increase contact electric conductivity, back-up sand milling method manufactures many pits affluxion body in lithium ion batteries, while rolling battery afflux liquid, battery current collecting surface is made to define pit, change traditional first rolling, rear surface is processed into the technique of pit, relative to chemical corrosion and metal etch method process collection liquid surface, there is manufacture craft simple, non-environmental-pollution, be applicable to the advantage of large-scale industrial production, relative to laser processing, there is equipment investment few, the advantage low to the technical requirement of operating personnel.
Accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram of an embodiment of the present invention;
Fig. 2 is the operation principle schematic diagram of the another kind of embodiment of the present invention.
In Fig. 1,1 left-hand roll, 2 dextrad rolls, 3 left-hand back-up sand buckets, 4 dextrad back-up sand buckets, 5 collectors, 6 particles;
In Fig. 2,1 left-hand roll, 2 dextrad rolls, 5 collectors, 7 left salient points, 8 right salient points.
Embodiment
Refer to Fig. 1, what the present invention disclosed is a kind of pit affluxion body in lithium ion batteries, and be provided with pit at least one side of described collector 5, described pit is formed in described collector is by the process of heat transfer.In Fig. 1, described collector 5 by the process of heat transfer is: when described collector 5 passes through the roll compacting station between left-hand roll 1 and dextrad roll 2, left-hand back-up sand bucket 2 above left-hand roll 1 is inserted hardness and is greater than the particle 6 of current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, described particle 6 is made to form left side pit in the left side of collector 5; Certainly, also can or dextrad back-up sand bucket 4 simultaneously above dextrad roll 2 insert hardness and be greater than the particle 6 of current collector material hardness between collector 5 and dextrad roll 2, along with the extruding of dextrad roll 2, described particle 6 is made to form right side pit on the right side of collector 5.In order to make particle 6 can depart from completely with collector 5 further, after this, jittering device (not shown) can be added, collector 5 is shaken, thus particle 6 is shaked out from collector 5 at roll compacting station.
Preferential, described particle 6 can be zircon sand particle or ceramic microsphere, and its average grain diameter is selected in 2 ~ 4 microns, and optimum is 3 microns.
Back-up sand milling method is adopted to manufacture pit affluxion body in lithium ion batteries in the present embodiment.
The material that described back-up sand adopts, selects zircon sand or ceramic microsphere, preferred zircon sand.
Described collector is the contact conductive devices of lithium ion cell positive or negative electrode active material, and what positive pole adopted is aluminium foil, and graphite cathode is adopted as Copper Foil.
The object that back-up sand milling method in the present embodiment manufactures pit affluxion body in lithium ion batteries is the pit gathered at collector plane machining, the plane of collector increases the interface state that namely pit gathered improves collector, make active material and collection liquid surface increase contact-making surface, enhance the contact electric conductivity of active material and collector.
Back-up sand milling method is: collector 5 by during roll compacting station between left-hand roll 1 and dextrad roll 2 simultaneously, be positioned at the left-hand back-up sand bucket 3 above left-hand roll 1 and dextrad roll 2, dextrad back-up sand bucket 4 synchronously inserts zircon sand (also can use ceramic microsphere), zircon sand fills in roll 1, between 2 and collector 5, collector 5 and zircon sand are simultaneously by roll compacting, roll pressed zircon sand, zircon sand extruding collector 5, because collector material is fine copper or fine aluminium, the hardness comparing collector 5 due to zircon sand differs greatly, the hardness HRb=10 of the fine copper HOO trade mark, aluminium foil 3003H18 trade mark hardness HB=50, the hardness of zircon sand is HV=12Gpa, when roll roll compacting zircon sand, zircon sand extruding collector, there is pit distortion in collector 5, the degree of depth of pit and the pit mouth size of pit, determined by the size of zircon sand.In the present embodiment, described zircon sand also can replace with ceramic microsphere.
According to Copper Foil 9 ~ 16 micron thickness that existing affluxion body in lithium ion batteries adopts usually, aluminium foil 15 ~ 30 micron thickness adopted, select the degree of depth of pit and the pit mouth size of pit to need to avoid collector 5 to be punctured perforation by the zircon sand of roll compacting causes tensile property to reduce simultaneously, the degree of depth of pit distortion must be controlled, 1/20 ~ 1/10 of the degree of depth choice set fluid thickness of pit, after roll compacting, pit distribution accounts for more than 50% of the surface of whole collector, and it is more than 2.5 times of roll compacting frontal plane that collection liquid surface amasss; In the present embodiment, the degree of depth of described pit selects 1 ~ 2 micron, preferably 1.5 microns, the average diameter of particles size Selection of zircon sand 2 ~ 4 microns, preferably 3 microns, the particle zircon sand of 3 micron diameters is pressed into collector tissue with more than 50%, form dark 1.5 microns of pit, pit mouth size 3 microns.
Like this, pit affluxion body in lithium ion batteries active material and collection liquid surface increase contact-making surface, increase active material and afflux body surface adhered area, favourable enhancing adhesion strength, thus increase contact electric conductivity, back-up sand milling method manufactures many pits affluxion body in lithium ion batteries, while rolling battery afflux liquid, battery current collecting surface is made to define pit, change traditional first rolling, rear surface is processed into the technique of pit, relative to chemical corrosion and metal etch method process collection liquid surface, there is manufacture craft simple, non-environmental-pollution, be applicable to the advantage of large-scale industrial production, relative to laser processing, there is equipment investment few, the advantage low to the technical requirement of operating personnel.
The present invention also provides a kind of milling method of pit affluxion body in lithium ion batteries, when collector 5 is by heat transfer, looks unfamiliar into pit at least one of collector 5 simultaneously.
Preferably, when described collector 5 passes through the roll compacting station between left-hand roll 1 and dextrad roll 2, left-hand back-up sand bucket 3 above left-hand roll 1 is inserted hardness and is greater than the particle 6 of current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, described particle 6 is made to form left side pit in the side of collector 5; Or/and the dextrad back-up sand bucket 4 above dextrad roll 2 inserts hardness be greater than the particle 6 of current collector material hardness between collector 5 and dextrad roll 2, along with the extruding of dextrad roll 2, described particle 6 is made to form right side pit at the opposite side of collector 5.
The present invention also provides a kind of equipment preparing pit affluxion body in lithium ion batteries, comprise the left-hand roll 1 for rolling collector 5 and dextrad roll 2, left-hand back-up sand bucket 3 is provided with above described left-hand roll 1, when rolling collector 5, described left-hand back-up sand bucket 3 is inserted hardness and is greater than the particle 6 of current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, described particle 6 is made to form left side pit in the side of collector 5; Or/and be provided with dextrad back-up sand bucket 4 above described dextrad roll 2, when rolling collector 5, described dextrad back-up sand bucket 4 is inserted hardness and is greater than the particle 6 of current collector material hardness between collector 5 and dextrad roll 2, along with the extruding of dextrad roll 2, described particle 6 is made to form right side pit in the side of collector 5.
Refer to Fig. 2, the present invention also provides another kind to prepare the equipment of pit affluxion body in lithium ion batteries, comprise the left-hand roll 1 for rolling collector 5 and dextrad roll 2, described left-hand roll 1 is provided with left salient point 7, when described collector 5 passes through the roll compacting station between left-hand roll 1 and dextrad roll 2, left salient point 7 on left-hand roll 1, along with the extruding of left-hand roll 1, makes described left salient point 7 form left side pit in the side of collector 5; Or/and be provided with right salient point 8 on described dextrad roll 2, when described collector 5 passes through the roll compacting station between left-hand roll 1 and dextrad roll 2, right salient point 8 on dextrad roll 2, along with the extruding of dextrad roll 2, makes described right salient point 8 form right side pit at the opposite side of collector 5.
Left salient point 7 in the present embodiment or/and right salient point 8 preferably account for roller surface long-pending more than 50%.Left salient point 7, or/and right salient point 8 can adopt laser to be formed on roller surface, in order to ensure that the hardness of roller surface is greater than collector, can carry out cure process in first breaker roll surface, then, then forming required left salient point 7 or/and right salient point 8 with laser.
Preferably, described collector 5 by the process of heat transfer is: when described collector 5 passes through the roll compacting station between left-hand roll 1 and dextrad roll 2, left salient point 7 on left-hand roll 1, along with the roll compacting of left-hand roll 1, makes described left salient point 7 form left side pit in the side of collector 5; Or/and the right salient point 8 on dextrad roll 2 is along with the roll compacting of dextrad roll 2, described right salient point 8 is made to form right side pit at the opposite side of collector.
In the present invention, the average diameter of described salient point 7,8 is selected in 2 ~ 4 microns.
The present invention is while rolling battery afflux liquid 5, battery afflux liquid 5 surface is made to define pit, change traditional first rolling, rear surface is processed into the technique of pit, relative to chemical corrosion and metal etch method process collection liquid surface, there is manufacture craft simple, non-environmental-pollution, be applicable to the advantage of large-scale industrial production; Relative to laser processing, there is equipment investment few, the advantage low to the technical requirement of operating personnel.
Claims (4)
1. a pit affluxion body in lithium ion batteries, pit is provided with at least one side of described collector, it is characterized in that: to be the described collector formed in described collector is by the process of heat transfer by the process of heat transfer be described pit: when described collector is by roll compacting station between left-hand roll and dextrad roll, left-hand back-up sand bucket above left-hand roll is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and the dextrad back-up sand bucket above dextrad roll inserts hardness be greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, described particle is made to form right side pit at the opposite side of collector.
2. pit affluxion body in lithium ion batteries according to claim 1, is characterized in that, described particle is zircon sand particle or ceramic microsphere, and its average grain diameter is selected in 2 ~ 4 microns.
3. the milling method of a pit affluxion body in lithium ion batteries, it is characterized in that: when collector is by heat transfer, simultaneously when collector at least one looks unfamiliar into collector described in pit by roll compacting station between left-hand roll and dextrad roll, left-hand back-up sand bucket above left-hand roll is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, described particle is made to form left side pit in the side of collector; Or/and the dextrad back-up sand bucket above dextrad roll inserts hardness be greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, described particle is made to form right side pit at the opposite side of collector.
4. prepare the equipment of pit affluxion body in lithium ion batteries for one kind, comprise the left-hand roll for rolling collector and dextrad roll, it is characterized in that, left-hand back-up sand bucket is provided with above described left-hand roll, when rolling collector, described left-hand back-up sand bucket is inserted hardness and is greater than the particle of current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, makes described particle form left side pit in the side of collector; Or/and be provided with dextrad back-up sand bucket above described dextrad roll, when rolling collector, described dextrad back-up sand bucket is inserted hardness and is greater than the particle of current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, makes described particle form right side pit in the side of collector.
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| CN107346831A (en) * | 2016-05-04 | 2017-11-14 | 上海奇谋能源技术开发有限公司 | A kind of method for improving lithium ion battery service life |
| CN109802091B (en) * | 2018-12-29 | 2020-08-25 | 深圳市豪鹏科技有限公司 | Preparation method of nickel electrode |
| CN113140734A (en) * | 2021-04-06 | 2021-07-20 | 河北师范大学 | Method for preparing modified current collector aluminum foil at room temperature |
| CN113458197A (en) * | 2021-05-13 | 2021-10-01 | 汪新纪 | Flexible roll-bending numerical control plate bending machine |
| CN114914455B (en) * | 2022-05-16 | 2024-04-16 | 荣烯新材(北京)科技有限公司 | Device and method for surface micro-molding of current collector foil |
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| CN102138237A (en) * | 2008-09-01 | 2011-07-27 | 丰田自动车株式会社 | Battery current collector foil, method of manufacturing battery current collector foil, and battery |
| CN102575322A (en) * | 2009-09-30 | 2012-07-11 | 东洋铝株式会社 | Perforated aluminum foil, and process for production thereof |
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