CN103811768A - Concave pit lithium ion battery current collector as well as manufacturing method and equipment of concave pit lithium ion battery current collector - Google Patents
Concave pit lithium ion battery current collector as well as manufacturing method and equipment of concave pit lithium ion battery current collector Download PDFInfo
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- CN103811768A CN103811768A CN201410063502.9A CN201410063502A CN103811768A CN 103811768 A CN103811768 A CN 103811768A CN 201410063502 A CN201410063502 A CN 201410063502A CN 103811768 A CN103811768 A CN 103811768A
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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
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Abstract
The invention provides a concave pit lithium ion battery current collector as well as a manufacturing method and equipment of concave pit lithium ion battery current collector. The manufacturing method comprises the following steps: filling the part between the current collector and a leftward roller with grains with the rigidity which is greater than that of a current collector material by a leftward sand filling hopper above the leftward roller when the current collector passes through a rolling station between the leftward roller and a rightward roller; extruding by the leftward roller to form a left concave pit in one side of the current collector by the grains; or/and filling the part between the current collector and the rightward roller with the grains with the rigidity which is greater than that of the current collector material by a rightward sand filling hopper above the rightward roller; and extruding by the rightward roller to form a right concave pit in one side of the current collector by the grains. According to the concave pit lithium ion battery current collector as well as the manufacturing method and equipment of of the current collector, the contact face between an active material of the concave pit lithium ion battery current collector and the surface of the current collector is enlarged and the surface sticking area between the active material and the current collector is enlarged, so that the adhesion strength is easy to enhance and the contact conductivity is improved; a process for manufacturing the concave pit lithium ion battery current collector by using a sand filling and rolling method is simple and is suitable for 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 that carrier is adhered in positive electrode and the coating of negative material slurry, also be the electric conductor device of positive electrode and negative material simultaneously, collector adopts Copper Foil or aluminium foil manufacture conventionally, 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, the discharge power of lithium ion battery has been proposed to powerful requirement, the increase of discharge power, collector is with anodal, collector increases with the conductive current that contacts of negative material, existing collector has highlighted along with discharge-rate increases the characteristic that battery heat production 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 that improves lithium ion battery, there is important practical significance.But, no matter existing collector is to adopt cathode copper manufacture, still rolling rolling makes and all belongs to planar structure, make collector smooth flat become male and fomale(M&F) in existing collector plane by methods such as processing blind hole by laser, chemical corrosion, electrolytic etchings, thereby reach the conductive area that contacts that increases 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 be in improvement.
Document is recorded:
Adopt chemical method to carry out etching to aluminum foil current collector surface, and then chemical deposition layer of metal film on collection liquid surface after etching, aluminum foil current collector is carried out to modification, 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, copper current collector and the ganoid copper current collector with blind hole are made to 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, can keep electrode structure with the collector of blind hole, and then guarantees less interface contact resistance.Result shows: Porous Cu collector can improve cycle performance and a coulomb efficiency [Tang Xingxian, the preparation of blind hole copper current collector and silica-based anode circulation performance improved to China YouSe Acta Metallurgica Sinica (English edition) 2013 23(6) 1,723 1727].
Carry out after electrolytic etching processing on the surface of negative current collector copper foil of lithium ion battery, surface has formed uniform gully formula structure, Copper Foil can be contacted more closely with negative material, interface mechanical bond power and conductivity are improved, cushion lithium and reacted the electrode change in volume causing with negative active core-shell material, reduce 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 are all improved, battery performance [the Fan Xing that makes moderate progress, electrolytic etching copper foil of affluxion body anticathode performance affect battery 2009 39(3) 131-136].
By affluxion body in lithium ion batteries aluminium foil surface is carried out to direct current etching processing, improve the interface state of collector, active material and aluminium collection liquid surface be " engagement " mutually, strengthened the contact performance of active material and collector.Positive active material actual specific capacity and cyclical stability be all improved [Wang Lizhen, etc.: direct current etching aluminium collector is to LiCoO
2cathode performance affect battery 2008 38(5) 300-304].
The hair side surface of hair surface copper foil is compared with the surface of shiny copper foil, hair side surface is more coarse, and electrolyte is at the reducing degree on hair surface copper foil surface 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 document institute record method, laser processing preparation table mask has the collector of blind hole to exist equipment investment large, production cost is high, the problem high to operating personnel's technical requirement, is difficult to marketing; Adopt chemical corrosion and metal etch method processing collection liquid surface to exist big for environment pollution, and the low problem of complex process production efficiency.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, to society provide that a kind of equipment investment is little, production cost is low, not high to operating personnel's technical requirement; Environment is not polluted, and the 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, be provided with pit at least one side of described collector, described pit is to form in by the process of heat transfer at described collector.
As the present invention is improved, 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, the left-hand back-up sand bucket of left-hand roll top is inserted particle that hardness is greater than current collector material hardness between collector and left-hand roll, along with the roll compacting of left-hand roll, make described particle form left side pit in a side of collector; Or/and the dextrad back-up sand bucket of dextrad roll top is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the roll compacting of dextrad roll, make described particle at the opposite side formation right side of collector pit.
As the present invention is improved, described particle is zircon sand particle or ceramic microsphere, and its average grain diameter is selected in 2～4 microns.
As the present invention is improved, 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 a side of collector; Or/and the right salient point of dextrad roll top along with the roll compacting of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
As the present invention is improved, 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, and in the time that collector passes through heat transfer, the while is at least one pit of looking unfamiliar into of collector.
As the present invention is improved, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, the left-hand back-up sand bucket of left-hand roll top is inserted particle that hardness is greater than current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, make described particle form left side pit in a side of collector; Or/and the dextrad back-up sand bucket of dextrad roll top is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, make described particle at the opposite side formation right side of collector pit.
As the present invention is improved, 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 a side of collector; Or/and the right salient point of dextrad roll top along with the extruding of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
The present invention also provides a kind of equipment of preparing pit affluxion body in lithium ion batteries, comprise left-hand roll and dextrad roll for rolling collector, above described left-hand roll, be provided with left-hand back-up sand bucket, in the time of rolling collector, described left-hand back-up sand bucket is inserted particle that hardness is greater than current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, make described particle form left side pit in a side of collector; Or/and be provided with dextrad back-up sand bucket above described dextrad roll, in the time of rolling collector, described dextrad back-up sand bucket is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, makes described particle form right side pit in a side of collector.
The present invention also provides another kind to prepare the equipment of pit affluxion body in lithium ion batteries, comprise left-hand roll and dextrad roll for rolling collector, on described left-hand roll, be 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 a 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, the right salient point of dextrad roll top, 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 form on roller surface, for the hardness that guarantees roller surface is greater than collector, can carry out cure process in first breaker roll surface, then, then forms 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, preferably 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 is manufactured pit affluxion body in lithium ion batteries is the pit densely covered at collector plane machining, the plane of collector increases densely covered pit has improved the interface state of collector, make active material and collection liquid surface increase contact-making surface, strengthened the contact electric conductivity of active material with collector.
Back-up sand milling method is: while when collector passes through the roll compacting station between left-hand roll and dextrad roll, be positioned at the left-hand back-up sand bucket of left-hand roll and dextrad roll top, dextrad back-up sand bucket is synchronously inserted 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 of 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, in the time of roll roll compacting zircon sand, zircon sand extruding collector, the distortion of collector generation pit, the pit mouth size of the degree of depth of pit and pit, size by zircon sand determines.In the present invention, described zircon sand also can replace with ceramic microsphere.
Conventionally Copper Foil 9～16 micron thickness that adopt according to existing affluxion body in lithium ion batteries, aluminium foil 15～30 micron thickness that adopt, 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, must control the degree of depth of pit distortion, 1/20～1/10 of the degree of depth choice set fluid thickness of pit, after roll compacting, pit distribution accounts for the surperficial more than 50% of whole collector, and collection liquid surface is long-pending is the more than 2.5 times of roll compacting frontal plane; In the present invention, the degree of depth of described pit is selected 1～2 micron, preferably 1.5 microns, 2～4 microns of the average diameter of particles size Selection of zircon sand, preferably 3 microns, the particle zircon sand of 3 micron diameters is more than 50% to be pressed into collector tissue, form dark 1.5 microns of pit, 3 microns of pit mouth sizes.
Pit affluxion body in lithium ion batteries active material and collection liquid surface have increased contact-making surface, active material and afflux body surface adhered area are increased, favourable enhancing adhesion strength, thereby increase contact electric conductivity, back-up sand milling method is manufactured many pits affluxion body in lithium ion batteries, in rolling battery afflux liquid, make battery current collecting surface form pit, change traditional first rolling, rear surface is processed into the technique of pit, process collection liquid surface with respect to chemical corrosion and metal etch method, there is manufacture craft simple, non-environmental-pollution, be applicable to the advantage of large-scale industrial production, with respect to laser processing, there is equipment investment few, the advantage low to operating personnel's technical requirement.
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, is provided with pit at least one side of described collector 5, and described pit is to form in by the process of heat transfer at described collector.In Fig. 1, described collector 5 by the process of heat transfer is: when the roll compacting station of described collector 5 by between left-hand roll 1 and dextrad roll 2, the left-hand back-up sand bucket 2 of left-hand roll 1 top is inserted particle 6 that hardness is greater than current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, make described particle 6 form left side pit in the left side of collector 5; Certainly, also can or simultaneously insert particle 6 that hardness is greater than current collector material hardness between collector 5 and dextrad roll 2 at the dextrad back-up sand bucket 4 above dextrad roll 2, along with the extruding of dextrad roll 2, make described particle 6 at formation right side, the right side of collector 5 pit.In order further to make particle 6 depart from completely with collector 5, can after this, add jittering device (not shown) at roll compacting station, collector 5 is shaken, thereby particle 6 is shaked out from collector 5.
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.
In the present embodiment, adopt back-up sand milling method to manufacture pit affluxion body in lithium ion batteries.
The material that described back-up sand adopts, selects zircon sand or ceramic microsphere, preferably 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 is manufactured pit affluxion body in lithium ion batteries is the pit densely covered at collector plane machining, the plane of collector increases densely covered pit has improved the interface state of collector, make active material and collection liquid surface increase contact-making surface, strengthened the contact electric conductivity of active material with collector.
Back-up sand milling method is: while when roll compacting station by between left-hand roll 1 and dextrad roll 2 of collector 5, be positioned at the left-hand back-up sand bucket 3 of left-hand roll 1 and dextrad roll 2 tops, dextrad back-up sand bucket 4 is synchronously inserted zircon sand (also can use ceramic microsphere), zircon sand fills in roll 1, 2 and collector 5 between, 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 of 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, in the time of roll roll compacting zircon sand, zircon sand extruding collector, there is pit distortion in collector 5, the pit mouth size of the degree of depth of pit and pit, size by zircon sand determines.In the present embodiment, described zircon sand also can replace with ceramic microsphere.
Conventionally Copper Foil 9～16 micron thickness that adopt according to existing affluxion body in lithium ion batteries, aluminium foil 15～30 micron thickness that adopt, 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, must control the degree of depth of pit distortion, 1/20～1/10 of the degree of depth choice set fluid thickness of pit, after roll compacting, pit distribution accounts for the surperficial more than 50% of whole collector, and collection liquid surface is long-pending is the more than 2.5 times of roll compacting frontal plane; In the present embodiment, the degree of depth of described pit is selected 1～2 micron, preferably 1.5 microns, 2～4 microns of the average diameter of particles size Selection of zircon sand, preferably 3 microns, the particle zircon sand of 3 micron diameters is more than 50% to be pressed into collector tissue, form dark 1.5 microns of pit, 3 microns of pit mouth sizes.
Like this, pit affluxion body in lithium ion batteries active material and collection liquid surface have increased contact-making surface, active material and afflux body surface adhered area are increased, favourable enhancing adhesion strength, thereby increase contact electric conductivity, back-up sand milling method is manufactured many pits affluxion body in lithium ion batteries, in rolling battery afflux liquid, make battery current collecting surface form pit, change traditional first rolling, rear surface is processed into the technique of pit, process collection liquid surface with respect to chemical corrosion and metal etch method, there is manufacture craft simple, non-environmental-pollution, be applicable to the advantage of large-scale industrial production, with respect to laser processing, there is equipment investment few, the advantage low to operating personnel's technical requirement.
The present invention also provides a kind of milling method of pit affluxion body in lithium ion batteries, and in the time that collector 5 passes through heat transfer, the while is at least one pit of looking unfamiliar into of collector 5.
Preferably, when the roll compacting station of described collector 5 by between left-hand roll 1 and dextrad roll 2, the left-hand back-up sand bucket 3 of left-hand roll 1 top is inserted particle 6 that hardness is greater than current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, make described particle 6 form left side pit in a side of collector 5; Or/and the dextrad back-up sand bucket 4 of dextrad roll 2 tops is inserted particle 6 that hardness is greater than current collector material hardness between collector 5 and dextrad roll 2, along with the extruding of dextrad roll 2, make described particle 6 form right side pit at the opposite side of collector 5.
The present invention also provides a kind of equipment of preparing pit affluxion body in lithium ion batteries, comprise left-hand roll 1 and dextrad roll 2 for rolling collector 5, above described left-hand roll 1, be provided with left-hand back-up sand bucket 3, in the time of rolling collector 5, described left-hand back-up sand bucket 3 is inserted particle 6 that hardness is greater than current collector material hardness between collector 5 and left-hand roll 1, along with the extruding of left-hand roll 1, make described particle 6 form left side pit in a side of collector 5; Or/and be provided with dextrad back-up sand bucket 4 above described dextrad roll 2, in the time of rolling collector 5, described dextrad back-up sand bucket 4 is inserted particle 6 that hardness is greater than current collector material hardness between collector 5 and dextrad roll 2, along with the extruding of dextrad roll 2, make described particle 6 form right side pit in a 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 left-hand roll 1 and dextrad roll 2 for rolling collector 5, on described left-hand roll 1, be provided with left salient point 7, when the roll compacting station of described collector 5 by 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 a side of collector 5; Or/and be provided with right salient point 8 on described dextrad roll 2, when the roll compacting station of described collector 5 by 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 form on roller surface, for the hardness that guarantees roller surface is greater than collector, can carry out cure process in first breaker roll surface, then, then forms 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 the roll compacting station of described collector 5 by 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 a side of collector 5; Or/and the right salient point 8 on dextrad roll 2 along with the roll compacting of dextrad roll 2, makes described right salient point 8 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 in rolling battery afflux liquid 5, make battery afflux liquid 5 surfaces form pit, change traditional first rolling, rear surface is processed into the technique of pit, process collection liquid surface with respect to chemical corrosion and metal etch method, there is manufacture craft simple, non-environmental-pollution, the advantage of applicable large-scale industrial production; With respect to laser processing, there is equipment investment few, the advantage low to operating personnel's technical requirement.
Claims (10)
1. a pit affluxion body in lithium ion batteries, is provided with pit at least one side of described collector, it is characterized in that: described pit is to form in by the process of heat transfer at described collector.
2. pit affluxion body in lithium ion batteries according to claim 1, it is characterized in that, 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, the left-hand back-up sand bucket of left-hand roll top is inserted particle that hardness is greater than current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, make described particle form left side pit in a side of collector; Or/and the dextrad back-up sand bucket of dextrad roll top is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, make described particle at the opposite side formation right side of collector pit.
3. pit affluxion body in lithium ion batteries according to claim 2, is characterized in that, described particle is zircon sand particle or ceramic microsphere, and its average grain diameter is selected in 2～4 microns.
4. pit affluxion body in lithium ion batteries according to claim 1, it is characterized in that, 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 extruding of left-hand roll, makes described left salient point form left side pit in a side of collector; Or/and the right salient point on dextrad roll along with the extruding of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
5. pit affluxion body in lithium ion batteries according to claim 4, is characterized in that, the average diameter of described salient point is selected in 2～4 microns.
6. a milling method for pit affluxion body in lithium ion batteries, is characterized in that: in the time that collector passes through heat transfer, the while is at least one pit of looking unfamiliar into of collector.
7. the milling method of pit affluxion body in lithium ion batteries according to claim 6, it is characterized in that, when described collector passes through the roll compacting station between left-hand roll and dextrad roll, the left-hand back-up sand bucket of left-hand roll top is inserted particle that hardness is greater than current collector material hardness between collector and left-hand roll, along with the extruding of left-hand roll, make described particle form left side pit in a side of collector; Or/and the dextrad back-up sand bucket of dextrad roll top is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, make described particle at the opposite side formation right side of collector pit.
8. the milling method of pit affluxion body in lithium ion batteries according to claim 6, it is characterized in that, 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 a side of collector; Or/and the right salient point on dextrad roll along with the extruding of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
9. prepare the equipment of pit affluxion body in lithium ion batteries for one kind, comprise left-hand roll and dextrad roll for rolling collector, it is characterized in that, above described left-hand roll, be provided with left-hand back-up sand bucket, in the time of rolling collector, described left-hand back-up sand bucket is inserted particle that hardness is greater than 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 a side of collector; Or/and be provided with dextrad back-up sand bucket above described dextrad roll, in the time of rolling collector, described dextrad back-up sand bucket is inserted particle that hardness is greater than current collector material hardness between collector and dextrad roll, along with the extruding of dextrad roll, makes described particle form right side pit in a side of collector.
10. prepare the equipment of pit affluxion body in lithium ion batteries for one kind, comprise left-hand roll and dextrad roll for rolling collector, it is characterized in that, on described left-hand roll, be 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 a 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 on dextrad roll, along with the extruding of dextrad roll, makes described right salient point form right side pit at the opposite side of collector.
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| WO2017190642A1 (en) * | 2016-05-04 | 2017-11-09 | 王武生 | Method for prolonging service life of lithium ion battery |
| CN109802091A (en) * | 2018-12-29 | 2019-05-24 | 深圳市豪鹏科技有限公司 | A kind of 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 |
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| CN113458197A (en) * | 2021-05-13 | 2021-10-01 | 汪新纪 | Flexible roll-bending numerical control plate bending machine |
| CN114914455A (en) * | 2022-05-16 | 2022-08-16 | 喆烯新材(北京)科技有限公司 | Current collector foil surface micro-modeling device and method |
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