CN107871873A - A kind of electrode foil structure, battery, preparation method and preparation system - Google Patents

A kind of electrode foil structure, battery, preparation method and preparation system Download PDF

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Publication number
CN107871873A
CN107871873A CN201710899677.7A CN201710899677A CN107871873A CN 107871873 A CN107871873 A CN 107871873A CN 201710899677 A CN201710899677 A CN 201710899677A CN 107871873 A CN107871873 A CN 107871873A
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China
Prior art keywords
metal foil
hole
foil
battery
shrinkage pool
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CN201710899677.7A
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Chinese (zh)
Inventor
吴小林
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Changsha Li Anneng Electronic Technology Co Ltd
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Changsha Li Anneng Electronic Technology Co Ltd
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Priority to CN201710899677.7A priority Critical patent/CN107871873A/en
Publication of CN107871873A publication Critical patent/CN107871873A/en
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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
    • H01M4/80—Porous plates, e.g. sintered carriers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The present invention provides a kind of electrode foil structure, battery, preparation method and preparation system, i.e. on the basis of original plane foil material, it is processed into high density, micron-sized to wearing mesh, be advantageous to improve caking property of the battery plus-negative plate material on copper Al foil substrate surface, consumption of binder is reduced, accordingly improves battery energy density；The injection and infiltration of electrolyte, while the specific surface area increase that foil is contacted with positive and negative pole material are also beneficial to, the contact internal resistance between material and foil material is reduced, improves the charge-discharge magnification performance of battery；After through micron order mesh being machined with due to foil, the flexible nature of its material can become more preferable, it is more beneficial for the winding of battery pole piece, it can more effectively prevent battery core when minor radius is wound, easily produce bonding and loosely the problem of material falls back or disconnected pole piece occur, battery production qualification rate and efficiency will be so greatly improved, reduces energy consumption, while improve battery cycle life.

Description

A kind of electrode foil structure, battery, preparation method and preparation system
Technical field
The present invention relates to battery manufacturing field, and in particular to a kind of electrode foil structure, battery, preparation method and preparation system System.
Background technology
The both positive and negative polarity copper aluminium foil of rechargeable battery currently used in the market, is substantially using large-tonnage roll-in calendering side Formula, or produced by way of electrolysis, belong to the non-porous foil material of burnishing surface；And such smooth foil, prior art Battery plus-negative plate material can be coated with directly on the surface of foil material, then by drying, roll-in compacting, slitting, film-making, winding Or the technique such as lamination, welding assembly, filling electrolyte, forming and capacity dividing, produce finished battery；
But inventor find, the existing non-porous foil of plane, during rechargeable battery is applied to also there is Following problem：
1) this smooth non-porous foil material, surface smoother, when slurry is made in battery plus-negative plate material, in order in copper aluminium Foil material surface forms certain cohesive force and adds a certain proportion of binding agent, it is necessary to mix, because this binder material can account for The certain proportion of battery material is removed, typically in 2%~5% scope, battery energy density can be had a certain impact；And pass through The mode of this chemical bonding, after coating up, also easily produce shedding or drop off phenomenon；
2) this smooth non-porous foil material, because material has certain hardness and tensile strength in itself, in electric core winding During technique, because pliability is poor, when rolling up small round corner, the bad control of winding tension, and fillet can not be too small, not so can Easily produce the quality problems of pole piece fracture or material falls back；
3) this smooth non-porous foil material, surface is strong seamless non-porous, and when electrolyte is filled, electrolyte can only be suitable Two planes for material are slowly permeated, and fluid injection efficiency is extremely low.
4) this smooth non-porous foil material, when moisture is dried, moisture can only slowly ooze along two planes of material Discharge thoroughly, drying efficiency is extremely low, can not more ensure that the moisture in battery is fully excluded.
The content of the invention
The present invention provides a kind of electrode foil structure, battery, preparation method and preparation system, for avoiding shedding/drop off Phenomenon, the osmotic efficiency of electrolyte in battery, moisture drying efficiency are improved, and more effectively reduce moisture.
The first aspect of the invention provides a kind of electrode foil structure, including：Metal foil；
At least one surface of the metal foil is provided with multiple high-accuracy, through shrinkage pools of micron order, the shrinkage pool Bottom surface is punched areas；
The shrinkage pool carries out regular arrangement according to certain density, and through hole is provided with each shrinkage pool；It is described to wear The pore diameter range of open-work：0.001mm~0.2mm, the scope of the density of such perforation are：Every square millimeter of 1~20000 hole.
Alternatively, the material of the metal foil includes but is not limited to：Aluminium, copper, nickel；It is each described recessed on the metal foil The shape in hole includes but is not limited to：Cone, pyramid shaped.
Alternatively, the cup depth of each shrinkage pool is less than 0.05mm, and the flanging burr depth beyond foil plane is small In 0.04mm
The second aspect of the invention provides a kind of preparation method of electrode foil structure, including：
Continuous rolling is carried out to metal foil, so that the metal foil has multiple shrinkage pools of at least one side, the shrinkage pool Bottom surface is punched areas；The shrinkage pool is arranged according to certain hole density, and through hole is provided with each shrinkage pool；It is described to penetrate The aperture in hole meets pore diameter range；
Processing is coated to the metal foil, the area of application of the metal foil is covered on the punched areas, Make perforation be applied thing all to coat；
Slitting and film-making cutoff process are carried out to the metal foil.
Alternatively, the pore diameter range is 0.001mm~0.2mm；The scope of the hole density is：1~20000 hole/every Square millimeter.
Alternatively, slitting and cut-out film-making processing are carried out to the metal foil, including：
Continuous slitting or segmentation cut-out are carried out respectively from x directions and y directions to the plane of the metal foil, battery pole is made Piece；
Wherein, the x directions are parallel with the center of rotation axis direction of rolling die；The y directions and the roller die The center of rotation axis direction of tool is vertical；And the continuous slitting in the x directions or segmentation off-position and the punched areas Formed and be arranged at intervals, the spaced size range in the x directions is 0.1~50mm；The continuous slitting in the y directions divides Section off-position is arranged at intervals with described the area of application, and the spaced size range in the y directions is 0.1~50mm.
The third aspect of the invention provides a kind of preparation system of electrode foil structure, including：Unwinding equipment, roll-in are set Standby and winding device；
Wherein, the first end of the affixed metal foil of the unwinding equipment；The second of the affixed metal foil of winding device End；
The unwinding equipment coordinates the rolling surface for controlling the metal foil to pass through the rolling equipment with the winding device Carry out the working process of shrinkage pool；
The rolling equipment, for carrying out roll-in to the metal foil, so that the metal foil has the more of at least one side Individual shrinkage pool, the bottom surface of the shrinkage pool is punched areas；The shrinkage pool is according to 1~20000 hole/mm2Hole density is arranged, each described Through hole is provided with shrinkage pool；The pore size of the through hole meets 0.001mm~0.2mm pore diameter range.
Alternatively, the rolling equipment, including：Upper roller die group and lower roller die group；
The rolling equipment, for carrying out roll-in to the metal foil, so that the metal foil has the more of at least one side Individual shrinkage pool, the bottom surface of the shrinkage pool is punched areas；The shrinkage pool is according to 1~20000 hole/mm2Hole density is arranged, each described Through hole is provided with shrinkage pool；The pore size of the through hole meets 0.001mm~0.2mm pore diameter ranges；
The upper roller die group rotates along upper central axis, and the surface of the upper roller die group is provided with the upper right of perforation Salient point；It is to the distribution density of salient point on described：1~20000 hole/mm2；The roller diameter scope of the upper roller die group is：10 ~1200mm；The roller length range of the upper roller die group is：10~1500mm；
The lower roller die group rotates along lower central axis, and the surface of the lower roller die group is provided with the lower right of perforation Salient point；The lower distribution density to salient point is：1~20000 hole/mm2；The roller diameter scope of the lower roller die group is：10 ~1200mm；The roller length range of the lower roller die group is：10~1500mm；
When the metal foil is moved to roll-in position, the upper roller die group and the lower roller die group opposite direction rotating pair The metal foil of the roll-in position carries out roller process, by described to salient point and the lower opposite cooperation to salient point Roll-in, so that described at least one side is processed in the metal foil multiple shrinkage pools, the pore diameter range of the shrinkage pool is 0.001mm~0.2mm；The scope of the hole density of the shrinkage pool is：1~20000 hole/every square millimeter；The shape of the shrinkage pool Include but is not limited to be cone, pyramid.
Alternatively, by adjusting fit clearance and depth between the upper roller die group and the lower roller die group, with Configure the shrinkage pool pore size in metal foil.
Alternatively, in addition to：Continuous slitting and segmentation cutoff process technique；
The fourth aspect of the invention provides a kind of battery, includes one side or its possible implementation of any one Described electrode foil structure, both positive and negative polarity pole piece of the electrode foil structure as the battery.
Electrode foil structure, battery, preparation method and preparation system provided in an embodiment of the present invention, roller is carried out to metal foil Pressure processing so that micron order perforation is distributed with the metal foil surface after roll-in, when battery plus-negative plate slurry is coated in foil surface, The shrinkage pool on foil surface can be filled up, while covers the salient point on surface, increases the bond area between battery material and foil, from And realize and preferably bonded with foil material, input accounting of the binding agent in battery material system so can have both been reduced, again might be used To increase battery energy density, it is better protected from shedding or drops off phenomenon；Correspondingly, the electrode foil structure becomes more in itself It is flexible, in electric core winding technique, it is more beneficial for roundlet angular distortion winding, and the smooth unperforated foil of ratio that can do of small round corner turns Bent angle is smaller, and so as to avoid the hardness of pole piece too high, disconnected pole piece or the risk dropped off are produced when winding small round corner；Also, After the electrode foil structure, coated in the positive and negative pole material with micron order bumps hole foil two sides：Comprising moisture content, lithium from Son, polyelectrolyte etc., these material compositions can freer higher efficiency pass through highdensity micron order hole, it is real Faster infiltrated inside present battery core or discharge of circulating, the fluid injection efficiency and moisture that can improve electrolyte are toasted efficiency, saved Energy consumption, greatly improve production production capacity；Correspondingly, the contact area between electrode foil structure and positive and negative pole material is bigger, So as to improve battery charging and discharging multiplying power.
Brief description of the drawings
Fig. 1 is a kind of side view of the preparation system of electrode foil structure provided in an embodiment of the present invention；
Fig. 2 is the cross-sectional view of another roll-in module provided in an embodiment of the present invention；
Fig. 3 is the side view of the preparation system of another electrode foil structure provided in an embodiment of the present invention；
Fig. 4 is schematic diagram of the metal foil provided in an embodiment of the present invention through itemizing process；
Fig. 5 is a kind of schematic flow sheet of the preparation method of electrode foil structure provided in an embodiment of the present invention；
Fig. 6 is the schematic flow sheet of the preparation method of another electrode foil structure provided in an embodiment of the present invention；
Fig. 7 is a kind of structural representation of electrode foil structure provided in an embodiment of the present invention；
Fig. 8 A are the electrolyte circulation schematic diagram of battery in the prior art.
Fig. 8 B are a kind of electrolyte circulation schematic diagram of battery provided in an embodiment of the present invention.
Embodiment
Fig. 1 is a kind of side view of the preparation system of electrode foil structure provided in an embodiment of the present invention, should referring to Fig. 1 System includes：Including：Unwinding equipment 10, rolling equipment 11 and winding device 13；
Wherein, the first end of the affixed metal foil 20 of the unwinding equipment 10；The affixed metal foil of winding device 13 20 the second end；
The unwinding equipment 10 coordinates with the winding device 13 controls the metal foil 20 to pass through the rolling equipment 11 Rolling surface；
Specifically, referring to Fig. 1, the metal foil 20 passes through the rolling surface of rolling equipment 11 along feed direction.
The rolling equipment 11, for carrying out roll-in to the metal foil 20, so that the metal foil 20 has at least one Multiple shrinkage pools in face, the bottom surface of the shrinkage pool is punched areas；The shrinkage pool is according to 1~20000 hole/mm2Hole density is arranged, often Through hole is provided with the individual shrinkage pool；The pore size of the through hole meets 0.001mm~0.2mm pore diameter range.
The preparation system of electrode foil structure provided in an embodiment of the present invention, roller process is carried out to metal foil so that roller Micron order perforation is distributed with metal foil surface after pressure, when battery plus-negative plate slurry is coated in foil surface, can fill up foil table The concave point in face, while the salient point on surface is covered, the bond area between battery material and foil is increased, so as to realize preferably Bonded with foil material, so can both reduce input accounting of the binding agent in battery material system, battery energy can be increased again Metric density, it is better protected from shedding or drops off phenomenon；Correspondingly, the electrode foil structure becomes more flexible in itself, in battery core During winding process, roundlet angular distortion winding is more beneficial for, and the turning angle of the smooth unperforated foil of ratio that small round corner can be done is smaller, from And avoid the hardness of pole piece too high, disconnected pole piece or the risk dropped off are produced when winding small round corner；Also, using the electrode foil After material structure, coated in the positive and negative pole material with micron order bumps hole foil two sides：Include moisture content, lithium ion, polymer electrolytic Liquid etc., these material compositions can freer higher efficiency by highdensity micron order hole, realize inside battery core Faster infiltrate or circulate, the fluid injection efficiency and moisture baking efficiency of electrolyte can be improved, energy consumption is saved, improve production Energy；Correspondingly, the contact area between electrode foil structure and positive and negative pole material is bigger, so as to improve battery charging and discharging multiplying power.
Further, referring to Fig. 1, the rolling equipment 11, including：Upper roller die group 110 and lower roller die group 111；
The upper roller die group 110 is rotated along upper central axis, and the surface of the upper roller die group 110 is provided with to convex Point；It is to the distribution density of salient point on described：1~20000 hole/mm2；The roller diameter scope of the upper roller die group 110 is：10 ~1200mm；The roller length range of the upper roller die group 110 is：10~1500mm；
The lower roller die group 111 rotates along lower central axis, and the surface of the lower roller die group 111 is provided with lower to convex Point；The lower distribution density to salient point is：1~20000 hole/mm2；The roller diameter scope of the lower roller die group 111 is：10 ~1200mm；The roller length range of the lower roller die group 111 is：10~1500mm；
When the metal foil 20 is moved to roll-in position, the upper roller die group 110 and the lower roller die group 111 are revolved Turn to carry out roller process to the metal foil 20 of the roll-in position, it is excessively described on to salient point with it is described lower to the opposite of salient point Coordinate roll-in, so that described at least one side is processed in the metal foil there are multiple shrinkage pools, the pore diameter range of the shrinkage pool is 0.001mm~0.2mm；The scope of the hole density of the shrinkage pool is：1~20000 hole/every square millimeter；The shape of the shrinkage pool Include but is not limited to be cone, pyramid and other geometries.
Alternatively, the upper roller die group 110 and the lower roller die group 111 rotate the gold to the roll-in position Belong to paper tinsel 20 carry out roller process, the surface of metal foil 20 formed micron order through hole, the shape of these micron order through holes, comprising But it is not limited to the shapes such as circular port, square opening, polygonal hole, round taper hole, pyramid hole, other irregularly-shaped holes；These micron orders The method for punching in hole, including but not limited to using the one side process for stamping or two-sided cooperation process for stamping, Dan Yuan of the small stroke of high speed The roll-in of roller one side or the two-sided cooperation rolling methods of double round rollers etc.；
Further, it is general according to current rechargeable battery positive and negative pole material, its raw material powder granule particle size In nanoscale, after the cell size that can implement coating is made, grain diameter size is typically in 0.001~0.05mm models in its slurry Enclose, with reference to battery technology technique, the micron order piercing aperture size in these metal foils, be typically designed in 0.001mm~0.2mm Scope, hole is smaller, and the density that can arrange is bigger, and hole number just can be more；And the micrometer grade hole of these high-accuracy processing, all pass through It is well-regulated evenly distributed to cross the method progress of science, according to precision optical machinery processing technology and battery technology technological requirement, its hole For density design in every square millimeter of 1~20000 hole scope, Kong Yue is more, and processing needs more accurate, is more beneficial for metal foil both sides Moisture content, electrolyte and lithium ion activity；Required according to battery pole piece manufacturing process, arrangement mode of this some holes on foil material surface On, including but not limited in a manner of equidistant matrix and it is non-equidistantly but in the way of having arrangement regulation arrange, regular transverse direction Segmented arranges and regular longitudinal divisionses formula arrangement mode.
Alternatively, electrode foil body structure surface processing micron level perforation mode on, including but not limited to one direction perforation, Twocouese perforation means, when unidirectionally perforating, the one side of material is concave surface, is simultaneously convex surface, can improve certain slurry caking property； During using two-way perforation, there is the concave and convex surface of symmetrical quantity on material two sides, is more beneficial for improving arrangement of apertures density, drop The difficulty of processing of low perforated die, positive and negative pole material is improved in the caking property on foil surface, be more beneficial for the drying of moisture content, be electrolysed The injection and infiltration of liquid, reduce consumption of binder to greatest extent, corresponding to improve the accounting of both positive and negative polarity main material in the battery, So as to improve battery energy density, the contact area between battery material and foil material is added after perforation, also can accordingly be improved The charge-discharge magnification performance of battery；
Alternatively, by adjusting fit clearance and depth between the upper roller die group and the lower roller die group, with Configure the shrinkage pool pore size in metal foil.
The salient point of the upper roller die group and the matching grooves of the lower roller die group are set；
The groove of the upper roller die group matches setting with the salient point of the lower roller die group；
Also include：The metal foil support platform, so that the salient point is located remotely from each other.So that it is not easy between salient point Collision, improve die life.
Specifically, a kind of possible implementation of roll-in module is given below, the roll-in module can be used on above-mentioned Roll-in module 110 or lower roller die group 111, top are upper roller die group, and bottom is lower roller die group；Upper roller die group and lower roll Pressing mold group cooperates, to match the shape of the shrinkage pool of metal foil surface；Preferably, the shrinkage pool cross section be shaped as it is trapezoidal Shape；
Further, the roller is used for the bottom surface that shrinkage pool is passed through in nipping process, i.e. punched areas to convex point pressing；To be formed Above-mentioned through hole；
Further, in order to provide roll-in efficiency, Fig. 2 is the transversal of another roll-in module provided in an embodiment of the present invention Face schematic diagram, reference picture 2, wherein, a upper roller die group can include multiple upper roller perforating molds, and adjacent two upper rollers are beaten There is upper roller gap digit between punch die；Correspondingly, a lower roller die group can include multiple lower roll perforating molds, adjacent There is lower roll gap digit between two lower roll perforating molds；Upper roller die group and lower roller die group can pass through motor or cylinder etc. His actuating mechanism controls, carry out remote and close control, battery foil material in metal foil described above, i.e. figure, from upper roll-in Passed through between module and lower roller die group.
On the basis of Fig. 1, Fig. 3 is the side of the preparation system of another electrode foil structure provided in an embodiment of the present invention View, referring to Fig. 3, the system, in addition to：Slitting equipment 12；
After coating and drying and processing, the slitting equipment 12, the x directions for the plane from the metal foil 20 Continuous slitting or segmentation cut-out are carried out with y directions, battery pole piece is made.
Wherein, the x directions are parallel with the center of rotation axis direction of rolling die；The y directions and the roller die The center of rotation axis direction of tool is vertical；And the continuous slitting in the x directions or segmentation off-position and the punched areas Formed and be arranged at intervals, the spaced size range in the x directions is 0.1~50mm；The continuous slitting in the y directions divides Section off-position is arranged at intervals with described the area of application, and the spaced size range in the y directions is 0.1~50mm.
Further, the spaced beneficial effect is in order to ensure producing burr when reducing slitting or cut-out. In slitting process, because each manufacturer processes battery methods difference, Y side is that slitting equipment is completed mostly, and X-direction has winding to cut It is disconnected, there is cross cutting mode to cut off, emphasis is to illustrate slitting or can produce burr when being breaking at punch position, is cut in plane foil position When putting, flange will not be produced, causes burr, battery short circuit would not be caused, improve battery security.
Further, Fig. 4 is schematic diagram of the metal foil provided in an embodiment of the present invention through itemizing process, referring to Fig. 4, wherein The area of application is covered on punched areas, and the continuous slitting line in y directions passes through the axis of the area of application, and not with wearing Bore region intersects；And the segmentation line of cut in x directions is through the partition strip of two the area of application covering, and not with punched areas phase Hand over.So as to improve the security of itemizing process process.
The preparation system of the electrode foil structure provided based on above-described embodiment, the preparation side of system execution is given below The possible implementation of method.
Fig. 5 is a kind of schematic flow sheet of the preparation method of electrode foil structure provided in an embodiment of the present invention, referring to figure 5, this method includes：
Step 100, roll-in is carried out to metal foil, so that metal foil has multiple shrinkage pools of at least one side, the bottom surface of shrinkage pool For punched areas；Shrinkage pool is arranged according to certain hole density, and through hole is provided with each shrinkage pool；The aperture of through hole meets aperture Scope；
Step 101, processing is coated to metal foil, the area of application of metal foil is covered on punched areas；
Step 102, slitting and cut-out film-making processing are carried out to the metal foil.
The preparation method of electrode foil structure provided in an embodiment of the present invention, roller process is carried out to metal foil so that roller Micron order perforation is distributed with metal foil surface after pressure, when battery plus-negative plate slurry is coated in foil surface, can fill up foil table The concave point in face, while the salient point on surface is covered, the bond area between battery material and foil is increased, so as to realize preferably Bonded with foil material, so can both reduce input accounting of the binding agent in battery material system, battery energy can be increased again Metric density, it is better protected from shedding or drops off phenomenon；Correspondingly, the electrode foil structure becomes more flexible in itself, in battery core During winding process, roundlet angular distortion winding is more beneficial for, and the turning angle of the smooth unperforated foil of ratio that small round corner can be done is smaller, from And avoid the hardness of pole piece too high, disconnected pole piece or the risk dropped off are produced when winding small round corner；Also, using the electrode foil After material structure, coated in the positive and negative pole material with micron order bumps hole foil two sides：Include moisture content, lithium ion, polymer electrolytic Liquid etc., these material compositions can freer higher efficiency by highdensity micron order hole, realize inside battery core Faster infiltrate or circulate, the fluid injection efficiency and moisture baking efficiency of electrolyte can be improved, energy consumption is saved, improve production Energy；Correspondingly, the contact area between electrode foil structure and positive and negative pole material is bigger, so as to improve battery charging and discharging multiplying power.
Preferably, the pore diameter range is 0.001mm~0.2mm；The scope of the hole density is：1~20000 hole/every Square millimeter.
On the basis of Fig. 5, Fig. 6 is the stream of the preparation method of another electrode foil structure provided in an embodiment of the present invention Journey schematic diagram, referring to Fig. 6, a kind of possible implementation of wherein step 102 is：
Step 102a, continuous slitting is carried out respectively from x directions and y directions to the plane of metal foil or segmentation is cut off, be made Battery pole piece；
Wherein, x directions are parallel with the center of rotation axis direction of rolling die；Y directions and the pivot of rolling die Axis direction is vertical；And the continuous slitting in x directions or segmentation off-position are formed with punched areas to be arranged at intervals, x directions Spaced size range is 0.1~50mm；The continuous slitting in y directions or segmentation off-position are set with the area of application interval Put, the spaced size range in y directions is 0.1~50mm.
By the way of step 102a, the spaced beneficial effect is in order to ensure being produced when reducing slitting or cut-out Setation pierces.I.e. in slitting process, because each manufacturer processes battery methods difference, Y side is that slitting equipment is completed mostly, X side To there is winding to cut off, there is cross cutting mode to cut off, emphasis is to illustrate slitting or can produce burr when being breaking at punch position, is cut When on plane foil position, flange will not be produced, causes burr, battery short circuit would not be caused, improve battery security.
Specifically, it may refer to Fig. 4 for the step 102a effects realized.
Further, the preparation system provided based on above-described embodiment, the preparation method provided using above-described embodiment, under Face provides the possible implementation of above-mentioned electrode foil structure.
Specifically, Fig. 7 is a kind of structural representation of electrode foil structure provided in an embodiment of the present invention, should referring to Fig. 7 Electrode foil structure, including：Metal foil 20；
The metal foil 20 has multiple shrinkage pool 20-1 of at least one side, and the bottom surface 20-1a of the shrinkage pool is punched areas；
The shrinkage pool is high-accuracy, the through shrinkage pool of micron order.
The shrinkage pool 20-1 carries out regular arrangement according to certain density, it is provided with and penetrates on each shrinkage pool 20-1 Hole 20-2；The pore diameter range of the through hole 20-2：0.001mm~0.2mm, the scope of the density of such perforation are：Every square of milli 1~20000 hole of rice.
Electrode foil structure provided in an embodiment of the present invention, roller process is carried out to metal foil so that the metal after roll-in Paper tinsel surface distributed has micron order perforation, when battery plus-negative plate slurry is coated in foil surface, can fill up the concave point on foil surface, together When cover surface salient point, increase the bond area between battery material and foil, preferably glued so as to realize with foil material Knot, so can both reduce input accounting of the binding agent in battery material system, and can increase battery energy density again, more preferably Ground prevents shedding or drops off phenomenon；Correspondingly, the electrode foil structure becomes more flexible in itself, in electric core winding technique, Roundlet angular distortion winding is more beneficial for, and the turning angle of the smooth unperforated foil of ratio that small round corner can be done is smaller, so as to avoid pole piece Hardness it is too high, disconnected pole piece or the risk dropped off are produced when winding small round corner；Also, after using the electrode foil structure, Coated in the positive and negative pole material with micron order bumps hole foil two sides：Comprising moisture content, lithium ion, macromolecule electrolyte etc., these Material composition can freer higher efficiency by highdensity micron order hole, realize and faster soaked inside battery core Profit or circulation, the fluid injection efficiency and moisture baking efficiency of electrolyte can be improved, energy consumption is saved, improves production capacity；Correspondingly, it is electric Contact area between pole foil structure and positive and negative pole material is bigger, so as to improve battery charging and discharging multiplying power.
The material of the metal foil includes but is not limited to：Aluminium, copper, nickel；The shape of each shrinkage pool on the metal foil Shape includes but is not limited to：Cone, pyramid shaped and other geometries.
Correspondingly, a kind of battery is also disclosed in the embodiment of the present invention, and it applies the electrode foil structure described in above-described embodiment, Both positive and negative polarity pole piece as the battery.
Battery provided in an embodiment of the present invention, it uses the preparation system and method for above-described embodiment, after obtaining roll-in Metal foil, the metal foil surface after roll-in are distributed with micron order perforation, when battery plus-negative plate slurry is coated in foil surface, can filled out The concave point on foil surface is mended, while covers the salient point on surface, increases the bond area between battery material and foil, so as to real Now preferably bonded with foil material, so can both reduce input accounting of the binding agent in battery material system, and can increase again Add battery energy density, be better protected from shedding or drop off phenomenon；Correspondingly, the electrode foil structure becomes more soft in itself It is tough, in electric core winding technique, it is more beneficial for roundlet angular distortion winding, and the turning of the smooth unperforated foil of ratio that small round corner can be done Angle is smaller, and so as to avoid the hardness of pole piece too high, disconnected pole piece or the risk dropped off are produced when winding small round corner；Also, make After the electrode foil structure, coated in the positive and negative pole material with micron order bumps hole foil two sides：Comprising moisture content, lithium ion, Macromolecule electrolyte etc., these material compositions can freer higher efficiency pass through highdensity micron order hole, realize Faster infiltrate or circulate inside battery core, the fluid injection efficiency and moisture baking efficiency of electrolyte can be improved, save production energy Consumption, improve production capacity；Correspondingly, the contact area between electrode foil structure and positive and negative pole material is bigger, is filled so as to improve battery Discharge-rate.
Specifically, Fig. 8 A be in the prior art battery electrolyte circulate schematic diagram, referring to Fig. 8 A, wherein, it is existing just Pole aluminium foil and negative pole aluminium foil are all planar structure, therefore the electrolyte of positive electrode and negative material, can only be in axial stream Logical direction is circulated, and efficiency is told somebody what one's real intentions are.
By contrast, Fig. 8 B are a kind of electrolyte circulation schematic diagram of battery provided in an embodiment of the present invention, the battery Positive pole aluminium flake and negative pole aluminium flake, the electrode foil knot being pressed into using Kun pressures system disclosed in the above embodiment of the present invention Structure, then it can be seen from Fig. 8 B, due to being provided with multiple high-accuracy, through shrinkage pools of micron order on aluminium foil, therefore electrolyte is just Pole and negative pole can also carry out radial direction circulation in addition to the axial direction circulation of routine, so as to accelerate the diffusion of electrolyte with Infiltration, can accelerate expulsion efficiency of the moisture in stoving process, can be with significantly more efficient control and reduction in battery material Moisture, so as to improve security, battery cycle life etc..
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology The scope of scheme.

Claims (10)

  1. A kind of 1. electrode foil structure, it is characterised in that including：Metal foil；
    At least one surface of the metal foil is provided with multiple high-accuracy, through shrinkage pools of micron order, the bottom surface of the shrinkage pool For punched areas；
    The shrinkage pool carries out regular arrangement according to certain density, and through hole is provided with each shrinkage pool；The through hole Pore diameter range：0.001mm~0.2mm, the scope of the density of such perforation are：Every square millimeter of 1~20000 hole.
  2. 2. electrode foil structure according to claim 1, it is characterised in that the material of the metal foil includes but unlimited In：Aluminium, copper, nickel；The shape of each shrinkage pool includes but is not limited on the metal foil：Cone, pyramid shaped.
  3. 3. the electrode foil structure described according to claim 1 and requiring 2, it is characterised in that the depression of each shrinkage pool is deep Degree is less than 0.05mm, and the flanging burr depth beyond foil plane is less than 0.04mm.
  4. A kind of 4. preparation method of electrode foil structure, it is characterised in that including：
    Continuous rolling is carried out to metal foil, so that the metal foil has multiple shrinkage pools of at least one side, the bottom surface of the shrinkage pool For punched areas；The shrinkage pool is arranged according to certain hole density, and through hole is provided with each shrinkage pool；The through hole Aperture meets pore diameter range；
    Processing is coated to the metal foil, the area of application of the metal foil is covered on the punched areas, makes to wear Hole is applied thing and all coated；
    Slitting and cut-out film-making processing are carried out to the metal foil.
  5. 5. according to the method for claim 4, it is characterised in that the pore diameter range is 0.001mm~0.2mm；The hole The scope of density is：1~20000 hole/every square millimeter.
  6. 6. according to the method for claim 5, it is characterised in that slitting and cut-out film-making processing are carried out to the metal foil, Including：
    Continuous slitting or segmentation cut-out are carried out respectively from x directions and y directions to the plane of the metal foil, battery pole piece is made；
    Wherein, the x directions are parallel with the center of rotation axis direction of rolling die；The y directions and the rolling die Center of rotation axis direction is vertical；And the continuous slitting in the x directions or segmentation off-position are formed with the punched areas It is arranged at intervals, the spaced size range in the x directions is 0.1~50mm；The continuous slitting or segmentation in the y directions are cut Disconnected position is arranged at intervals with described the area of application, and the spaced size range in the y directions is 0.1~50mm.
  7. A kind of 7. preparation system of electrode foil structure, it is characterised in that including：Unwinding equipment, rolling equipment and winding device；
    Wherein, the first end of the affixed metal foil of the unwinding equipment；Second end of the affixed metal foil of winding device；
    The unwinding equipment coordinates with the winding device controls the metal foil to be carried out by the rolling surface of the rolling equipment The working process of shrinkage pool；
    The rolling equipment, for carrying out roll-in to the metal foil, so that the metal foil has the multiple recessed of at least one side Hole, the bottom surface of the shrinkage pool is punched areas；The shrinkage pool is according to 1~20000 hole/mm2Hole density is arranged, each shrinkage pool On be provided with through hole；The pore size of the through hole meets 0.001mm~0.2mm pore diameter range.
  8. 8. preparation system according to claim 7, it is characterised in that the rolling equipment, including：Upper roller die group is with Roll-in module；
    The upper roller die group rotates along upper central axis, the surface of the upper roller die group be provided with perforation on to convex Point；It is to the distribution density of salient point on described：1~20000 hole/mm2；The roller diameter scope of the upper roller die group is：10~ 1200mm；The roller length range of the upper roller die group is：10~1500mm；
    The lower roller die group rotates along lower central axis, and the surface of the lower roller die group is provided with the lower to convex of perforation Point；The lower distribution density to salient point is：1~20000 hole/mm2；The roller diameter scope of the lower roller die group is：10~ 1200mm；The roller length range of the lower roller die group is：10~1500mm；
    When the metal foil is moved to roll-in position, the upper roller die group and the lower roller die group opposite direction rotating are to described The metal foil of roll-in position carries out roller process, by described to salient point and the lower opposite cooperation roller to salient point Pressure so that at least one side is processed in the metal foil multiple shrinkage pools, the pore diameter range of the shrinkage pool for 0.001mm~ 0.2mm；The scope of the hole density of the shrinkage pool is：1~20000 hole/every square millimeter；The shape of the shrinkage pool includes but unlimited Then cone, pyramid.
  9. 9. preparation system according to claim 8, it is characterised in that with by adjust the upper roller die group with it is described under Fit clearance and depth between roll-in module, to configure the shrinkage pool pore size in metal foil；
    The salient point of the upper roller die group and the matching grooves of the lower roller die group are set；
    The groove of the upper roller die group matches setting with the salient point of the lower roller die group；
    Also include：The metal foil support platform, so that the salient point is located remotely from each other.
  10. 10. a kind of battery, it is characterised in that include the electrode foil structure described in claim any one of 1-3, the electrode foil Both positive and negative polarity pole piece of the material structure as the battery.
CN201710899677.7A 2017-09-28 2017-09-28 A kind of electrode foil structure, battery, preparation method and preparation system Pending CN107871873A (en)

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CN113903885A (en) * 2021-09-30 2022-01-07 江苏天辉锂电池有限公司 Three-dimensional microporous aluminum foil, lithium ion battery anode, lithium ion battery, preparation method of lithium ion battery anode and electric equipment
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