CN106531961B - Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery - Google Patents
Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery Download PDFInfo
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- CN106531961B CN106531961B CN201710026308.7A CN201710026308A CN106531961B CN 106531961 B CN106531961 B CN 106531961B CN 201710026308 A CN201710026308 A CN 201710026308A CN 106531961 B CN106531961 B CN 106531961B
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- groove
- roll shaft
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
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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
Present invention discloses a kind of lithium ion battery electrode pieces, including collector and coating layer of active substance；The coating layer of active substance even application is symmetrically uniformly distributed groove on collector two sides, the coating layer of active substance surface of the two sides.The present invention prepares the groove that thick pole piece has specific shape, can significantly improve electrolyte ownership in battery, is conducive to the use of battery long circulating；And thick pole piece is uniformly distributed specific shape groove, is conducive to the infiltration and diffusion of electrolyte, improves the rate charge-discharge chemical property of battery；Thick pole piece is uniformly distributed the specific surface area that specific shape groove increases pole piece simultaneously, reduces the polarized current density in battery charge and discharge process, improves large current charge anode diaphragm analysis lithium risk, improves the safe handling of battery.
Description
Technical field
The present invention relates to new energy field, especially relate to lithium ion battery electrode piece, pole piece rolling device and
Lithium ion battery.
Background technique
With wideling popularize for new-energy automobile, power battery demand increasingly increases.Especially for high energy measurement, height
Safety, the craving of long circulation life lithium-ion-power cell are especially prominent.Energy density lithium ion power battery usually has
Have: (1) activity substance content in high unit mass (volumetric spaces), (2) high gram volume positive/negative material, (3) more low quality
The packaging material etc. of density.In recent years, numerous lithium battery manufacturers are by increasing pole piece coating layer of active substance thickness or compacted density
The space hold ratio of active material is improved, achievees the purpose that promote battery integral energy density.However, thick coat electrode
Pole piece increases contact distance of the bottom active material with electrolyte, extends lithium-ion electric migration distance, will cause to be electrolysed
The infiltration and absorption of liquid are more difficult, so that the internal resistance of cell is larger, battery charge and discharge process polarization potential is higher, capacity hair
Wave a series of problems, such as abnormal, high rate performance is poor, low temperature analyses lithium, Capacity fading is fast.Especially in high current density and
Charge and discharge cause Li dendrite to be formed under low temperature environment, and Li dendrite, which pierces through isolation film, causes positive and negative anodes short-circuit, and there are certain safety
Hidden danger.Moreover, the generation of Li dendrite increases the side reaction of electrolyte and lithium metal, lithium active material is consumed, battery is reduced and follows
Ring utilization rate.
Mainly change with the following method for existing thick coating or high compacted density electrode plates those skilled in the art
The infiltration of kind electrolyte, to improve the migration rate of lithium ion, thus to solve because of heavy coated electrode pole piece internal concentration polarization
Greatly, high rate performance is poor, problem of pole piece consistency difference: (1) preparing the active material slurry containing different pore creating material concentration and coat
Collector obtains having porosity gradient coating pole piece in a thickness direction, to improve the infiltration infiltration of electrolyte, improves electrode
The transmission (such as patent of invention: CN102324493A, CN102694150A, CN102655229A) of middle lithium ion/electronics；(2) it adopts
Multiple layered coatings mode is carried out with low-solid content slurry, and the heavy coated electrode pole piece with different porosities gradient is prepared
(such as patent of invention: CN102969483A)；(3) several holes must be contained by carrying out roll pressing to current collector aluminum foil using band felting needle roller
Substrate, be coated using this substrate be conducive to improve electrode two sides coating became uneven the problem of (such as patent of invention:
CN102760863A)。
But in above-mentioned existing improved method, brings and make while improving thick coating pole piece electrolytic solution permeability problem
The different negative effects such as hole agent residual, multi-layer coated complex procedures, the punching easily broken band of collector, therefore, existing high-energy is close
The manufacturing method of degree lithium-ion-power cell thickness coated electrode pole piece could be improved.
Summary of the invention
The main object of the present invention is to provide a kind of lithium ion battery electrode piece, it is intended to solve existing high-energy density lithium
Ion battery bring negative issue due to using thick coating layer of active substance pole piece.
The present invention proposes a kind of lithium ion battery electrode piece, comprising: collector and coating layer of active substance；The active matter
Matter coating uniform is coated in collector two sides, and the coating layer of active substance surface of the two sides is symmetrically uniformly distributed groove.
Preferably, the coating layer of active substance of the two sides is with a thickness of 200 μm to 300 μm.
Preferably, the groove is one of cone-shaped groove, wedge-shaped impression or square groove or a variety of；The groove
Interstice coverage is 100 μm to 500 μm.
Preferably, the collector is one in metal aluminum foil, metal copper foil, conductive coating aluminium foil or conductive coating copper foil
Kind.
Preferably, the groove is prepared by specific boss roll shaft roll-in or the cold pressing of specific boss plate.
The present invention also proposes a kind of pole piece rolling device, comprising: roll shaft and roll shaft surface are uniformly distributed boss；The roller
Axis surface is uniformly distributed boss, and on the coating layer of active substance surface of the pole piece two sides, symmetrically roll-in goes out roll-in pole piece in the process
It is uniformly distributed groove.
Preferably, the equally distributed boss in roll shaft surface is in conical boss, wedge-shaped boss or square boss
It is one or more；The boss interstice coverage is 100 μm to 500 μm.
The present invention also proposes a kind of lithium ion battery, comprising: anode pole piece, cathode pole piece, isolation film, shell and electrolysis
The coating layer of active substance surface of liquid, the anode pole piece two sides is symmetrically uniformly distributed groove；The work of the cathode pole piece two sides
Property matter coatings surface is uniformly distributed groove.
Preferably, the collector of the anode pole piece is metal aluminum foil, and the aluminum foil thickness is 10 μm to 15 μm；It is described negative
The collector of pole pole piece is metal copper foil, and the copper thickness is 6 μm to 10 μm；The anode pole piece, cathode pole piece two sides
Coating layer of active substance is with a thickness of 200 μm to 300 μm.
Preferably, the anode pole piece positive active material, conductive agent, binder mass ratio be 93~97:2~5:1
~3；The cathode pole piece negative electrode active material, conductive agent, binder mass ratio are 91~95:2~5:3~6.
The invention has the advantages that:
Compare the migration speed that existing thick coating or high compacted density electrode plates improve the infiltration of electrolyte, improve lithium ion
The method of rate, the present invention program make the active matter of thick pole piece two sides by specific boss roll shaft roll-in or the cold pressing of specific boss plate
Matter coating surface is symmetrically uniformly distributed groove, improves the infiltration of electrolyte, improves the migration rate of lithium ion, and then solves lithium
Ion battery is because of the blocked up bring series of negative problem of electrode plates.Active material in the present invention program in coated collector
Any pore creating material is not added for layer, therefore can avoid being distilled or being decomposed due to pore creating material not exclusively, there is residual in pole piece to battery
Capacity will adversely affect；And compared to multiple coating process is layered, this method is easy to operate and pole piece hole is easy control
System；Compared to active material mode is coated with after collector punching, the present invention program operation will not lose battery energy density, and roller
Press operation is easy, high production efficiency.
The present invention prepares the groove that thick pole piece has specific shape, can significantly improve battery electrolyte ownership, have
Conducive to the use of battery long circulating；And thick pole piece is uniformly distributed specific shape groove, is conducive to the infiltration and expansion of electrolyte
It dissipates, improves the charge and discharge chemical property of battery；Thick pole piece is uniformly distributed specific shape groove and increases pole piece simultaneously
Specific surface area, reduce the polarized current density in battery charge and discharge process, improve large current charge anode diaphragm analysis lithium
Risk improves the safe handling of battery.
Detailed description of the invention
Electrodes of lithium-ion batteries surface topography schematic diagram in Fig. 1 one embodiment of the invention；
Electrodes of lithium-ion batteries the schematic diagram of the section structure in Fig. 2 one embodiment of the invention；
The roll shaft structure schematic diagram of pole piece rolling device in Fig. 3 one embodiment of the invention；
The roll shaft surface boss top view of pole piece rolling device in Fig. 4 one embodiment of the invention；
The roll shaft surface boss sectional view of pole piece rolling device in Fig. 5 one embodiment of the invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Figures 1 and 2, the embodiment of the present invention proposes a kind of lithium ion battery electrode piece, comprising: collector 3 and work
Property matter coatings 1；1 even application of coating layer of active substance is on collector two sides, 1 surface of coating layer of active substance of the two sides
Symmetrically it is uniformly distributed groove 2.
Some improvement plans are used to improve thick pole coating bring battery negative effect in the prior art, but existing
Still there are many shortcomings for technology, for example the pore creating material being added in slurry has the volatile characteristic of high temperature, in coating baking, do
If temperature control is improper during dry will lead to pore creating material distillation or decompose not exclusively, there is residual will cause to bear to battery capacity
Face is rung.In addition, preparation has different porosities gradient coating pole piece electrode, generallys use the multiple coating method of layering and realizes,
Preparation section is considerably complicated.Hole knockout is carried out to collector foil using band felting needle roller and obtains high porosity diaphragm structure, though
So it can effectively improve infiltration and diffusion of the electrolyte on diaphragm thickness direction, but pore-creating will cause the drop of battery energy density
It is low, meanwhile, high porosity diaphragm easily broken band in subsequent high-intensitive tension force stretching nipping process causes to produce and process low efficiency.
In consideration of it, the embodiment of the invention provides a kind of highly secure lithium ion battery electrode plates manufacturing method, use this method can be with
It is adjustable to produce thick coating pole piece pore-size distribution, process is implemented simply, and to pole piece active material without destruction, the short time can be criticized
Amount production.In addition, the battery using this pole piece structure has high electrolyte ownership, charging and discharging currents even density is effectively kept away
The formation for exempting from Li dendrite causes to pierce through isolation film generation internal short-circuit risk.
Further, the coating layer of active substance 1 of the two sides with a thickness of 200 μm to 300 μm.The groove 2 is circular cone
One of connected in star, wedge-shaped impression or square groove are a variety of；2 interstice coverage of groove is 100 μm to 500 μm.
Increase pole piece coating layer of active substance thickness or compacted density to improve the space hold ratio of active material, reaches and mention
Rise the purpose of battery integral energy density.However, thick coating pole piece increases contact distance of the bottom active material with electrolyte,
Extend lithium-ion electric migration distance, will cause electrolyte infiltration and absorb it is more difficult so that the internal resistance of cell compared with
Greatly, battery charge and discharge process polarization potential is higher, and capacity performance is abnormal, high rate performance is poor, low temperature analyses lithium, Capacity fading
A series of problems, such as fast.Especially under high current density and low temperature environment charging cause Li dendrite to be formed, Li dendrite pierce through every
Cause positive and negative anodes short-circuit from film, there are some potential safety problemss.Moreover, the generation of Li dendrite increases electrolyte and lithium metal
Side reaction consumes lithium active material, reduces circulating battery utilization rate.
The embodiment of the present invention is to improve battery energy density, uses heavy coated electrode structure and designs, but to improve thick pole
Piece bring negative performance effects, the present invention prepare thick pole piece and are uniformly distributed the groove with specific shape, can significantly mention
High battery electrolyte ownership is conducive to the infiltration and diffusion of electrolyte, improves the charge and discharge chemical property of battery；Simultaneously
It keeps certain trench gap that can increase the specific surface area of pole piece, reduces the polarized current density in battery charge and discharge process,
High current or low temperature charged anode diaphragm analysis lithium risk are improved, the safe handling of battery is improved.
Further, the collector 3 is in metal aluminum foil, metal copper foil, conductive coating aluminium foil or conductive coating copper foil
One kind.
Collector mainly collects the electric current that cell active materials generate defeated to form biggish current versus
Out, therefore collector should come into full contact with active material, and as small as possible be preferred is answered in internal resistance.Battery is led using functional coating
Electric substrate is surface-treated, and the contact resistance between positive and negative anodes active material and collector is reduced, and increases between the two attached
Put forth effort, the static conductive ability of collector can be increased, and then promote the overall performance of battery.
Further, the groove 2 is prepared by specific boss roll shaft roll-in or the cold pressing of specific boss plate.
The roll-in that it is 25N with drawing tension that positive and negative electrode pole piece coiled strip after the completion of coating is put by the embodiment of the present invention
On winding device, control tape running speed is 10m/min, and specific boss roll shaft roll-in is arranged and rolls power sizes values, cathode pole piece roll-in
Rolling power is 15 tons, and it is 50 tons that power is rolled in anode pole piece roll-in, carries out continuous rolling, and pole piece two sides symmetrically equally distributed ditch is made
Slot 2.Also it can be used and be similar to the plate with identical boss appearance structure, pole piece after coating is horizontally placed at two with identical
Between the plate of boss appearance structure, applies a certain size pressure and suppressed to obtain pole piece two sides symmetrically equally distributed ditch
Slot 2.
Referring to Fig. 3, Fig. 4 and Fig. 5, the embodiment of the present invention also proposes a kind of pole piece rolling device, comprising: roll shaft 5 and roller
5 surface of axis is uniformly distributed boss 4；5 surface of roll shaft is uniformly distributed boss 4, and roll-in pole piece is in the process in the pole piece two sides
Symmetrically roll-in goes out to be uniformly distributed groove 2 on coating layer of active substance 1 surface.
Above-mentioned specific roll shaft 5 can be prepared using laser ablation cylindrical roll shaft, and the roll shaft being prepared has equal
The film layer structure of even distribution boss 4, by the synchronous roll-in of above-mentioned two identical roll shaft 5 to prepare pole piece active matter coating surface
Double-sided symmetrical distribution groove 2.
Further, the equally distributed boss 4 in 5 surface of roll shaft is wedge-shaped boss；4 interstice coverage of boss is
100 μm to 500 μm.
The embodiment of the present invention selects wedge-shaped boss 4 to prepare simply, low manufacture cost, and is able to achieve the hair of the embodiment of the present invention
Improving eyesight.4 interstice coverage of boss described in the embodiment of the present invention is 100 μm to 500 μm, can keep electrode is with higher to compare table
Area, positive and negative anodes surface pore corresponding region are conducive to the storage of electrolyte.
The embodiment of the present invention also proposes a kind of lithium ion battery, comprising: anode pole piece, cathode pole piece, isolation film, shell with
And electrolyte, the coating layer of active substance surface of the anode pole piece two sides are symmetrically uniformly distributed groove；The cathode pole piece two
The coating layer of active substance surface of side is symmetrically uniformly distributed groove.
Anode pole piece, the cathode pole piece of above-mentioned lithium ion battery have been all made of the coating layer of active substance surface of two sides symmetrically
It is uniformly distributed the structure design of groove, the ownership of battery pole piece electrolyte is maximally improved, maximizes and improve lithium ion battery
Electrolytic solution permeability, and then improve lithium ion battery comprehensive electrochemical properties.
Anode pole piece, cathode pole piece involved in the embodiment of the present invention can be anode pole piece or cathode pole piece
The coating layer of active substance surface of two sides is symmetrically uniformly distributed groove.And the shape of the groove, size, spacing are for same
The positive and negative anodes pole piece of battery can random fit, but for the groove on the two sides coating layer of active substance surface of same pole piece should uniformly it is right
The distribution of title property reduces electrode plates localizing electrode phenomenon to meet the requirement of pole piece balanced current distribution.
Further, the collector of the anode pole piece is metal aluminum foil, and the aluminum foil thickness is 10 μm to 15 μm；It is described
The collector of cathode pole piece is metal copper foil, and the copper thickness is 6 μm to 10 μm；The anode pole piece, cathode pole piece two sides
Coating layer of active substance with a thickness of 200 μm to 300 μm.
Further, the anode pole piece positive active material, conductive agent, binder mass ratio be 93~97:2~5:
1~3；The cathode pole piece negative electrode active material, conductive agent, binder mass ratio are 91~95:2~5:3~6.
Prepare above-mentioned based lithium-ion battery positive plate: by anode material nickel cobalt manganic acid lithium LiNi0.5Co0.2Mn0.3O2, conductive agent
Carbon black, binder Kynoar (PVDF) according to mass ratio be 95:3:2 after mixing, be added Solvents N-methyl pyrrolidines
The mixing of ketone (NMP) uniform stirring, obtains uniform slurry of pole piece of positive pole.Above-mentioned slurry is coated on to the metal aluminum foil collection of 12 μ m thicks
Fluid is two-sided, and coating double thickness is about 300 μm, then dries in 110 DEG C of vacuum ovens.
The roll shaft of wedge-shaped boss is evenly distributed with using two identical surfaces, under 50 tons of pressure, to positive after drying
Pole piece two sides carries out continuous rolling, and anode pole piece surface is 100 μm there are vee-cut, trench gap distance after roll-in, groove
Width is 100 μm, and trench depth is 100 μm, and is symmetrically evenly distributed on anode pole piece both side surface.
Negative electrode tab preparation: by negative electrode active material artificial graphite FSN-1, conductive agent carbon black, binder carboxymethyl cellulose
(CMC) it is uniformly mixed with butadiene-styrene rubber (SBR) according to mass ratio for 93:3:2:2, it is mixed that solvent deionized water uniform stirring is added
It closes, obtains uniform cathode pole piece slurry.The metal copper foil collector that above-mentioned slurry is coated on 8 μ m thicks is two-sided, coats two-sided
Thickness is about 300 μm, is then dried in 100 DEG C of vacuum ovens.
The roll shaft of wedge-shaped boss is evenly distributed with using two identical surfaces, under 15 tons of pressure, to cathode after drying
Pole piece two sides carries out continuous rolling, and cathode pole piece surface is 100 μm there are vee-cut, trench gap distance after roll-in, groove
Width is 120 μm, and trench depth is 120 μm, and is symmetrically evenly distributed on cathode pole piece both side surface.
Production lithium-ion-power cell: anode pole piece, cathode pole piece, with PE/PP/PE ceramics is prepared in above-mentioned technique
Isolation film is assembled into battery core according to winding or lamination process, and above-mentioned ceramic diaphragm is that isolation film dual coating has aluminium oxide ceramics
Layer.Battery core is placed in battery case, welding encapsulation is carried out after vacuum drying treatment, and inject electrolyte, above-mentioned electrolyte is
The lithium hexafluorophosphate electrolyte solution of 1.0mol/L, with lithium hexafluoro phosphate (LiPF6) it is lithium salts, ethylene carbonate (EC), propylene carbonate
Ester (PC), dimethyl carbonate (DMC) are solvent, and each solvent quality ratio is 1:1:1.
The embodiment of the present invention has given in comparative example the lithium-ion-power cell in above-mentioned specific embodiment
Lithium-ion-power cell, the ingredient of lithium ion power battery cathode pole piece, cathode pole piece in comparative example, coating process,
Coating layer thickness, collector parameter etc. are identical with the lithium-ion-power cell in above-mentioned specific embodiment, and distinctive points only exist
In pole piece rolling process, using the smooth cylindrical roller bearing in surface, under 50 tons of pressure, to diaphragm two positive after drying
Face carries out continuous rolling, and the cylindrical roller bearing smooth using surface, under 15 tons of pressure, to cathode membrane after drying
Two sides carries out continuous rolling.Lithium-ion-power cell system in the production process of lithium-ion-power cell and above-mentioned specific embodiment
It is consistent to make process.
Lithium-ion-power cell in lithium-ion-power cell and comparative example in above-mentioned specific embodiment is carried out
High rate performance test, test condition are as follows:
(1) under the conditions of room temperature (25 ± 2 DEG C), monomer lithium-ion-power cell is first with 1I1(A) current discharge is to 2.8V,
30min is shelved, then with 1I1(A) electric current constant-current charge to 4.3V when turn constant-voltage charge, until charging current is down to 0.05I1(A) when
Stop charging, shelves 30min after charging；
(2) then with 1I1(A) electric current constant-current discharge shelves 30min to 2.8V；
(3) respectively with 1/2I1(A)、1.0I1(A)、2.0I1(A)、3.0I1(A) multiplying power electric current constant-current charge to 4.3V when turn
Constant-voltage charge, until charging current is down to 0.05I1(A) stop charging when, shelve 30min after charging.Test obtains different multiplying electricity
The charging capacity flowed down.
The multiplying power of the lithium-ion-power cell in lithium-ion-power cell and comparative example in above-mentioned specific embodiment
The performance test results comparison is as follows:
From the comparison of the high rate performance test result of above-mentioned two groups of lithium-ion-power cells as can be seen that present invention specific implementation
By the high rate performance of the lithium-ion-power cell for the thick electrode pole piece preparation being distributed with uniform double-sided symmetrical groove in example, hence it is evident that
Better than the high rate performance of the lithium-ion-power cell in the comparative example of the thick electrode pole piece preparation by smooth surface.From above-mentioned
Data more particularly illustrate the groove that the thick coat electrode plates surface provided in the embodiment of the present invention has specific shape,
It is more advantageous to the performance of thick coated electrode pole piece chemical property.The wound of thick coating pole piece manufacture craft in the embodiment of the present invention
Thick pole piece bring negative effect is newly not only overcome, while avoiding the band for improvement thick coating pole piece performance in the prior art
The various drawbacks come.
The thick coat electrode plates surface provided in the embodiment of the present invention has the groove of specific shape, can significantly improve
Battery electrolyte ownership is conducive to the use of battery long circulating；And thick coat electrode plates surface is uniformly distributed specific shape
Shape groove is conducive to the infiltration and diffusion of electrolyte, improves the charge and discharge chemical property of battery；Thick coat electrode simultaneously
Pole piece is uniformly distributed the specific surface area that specific shape groove increases pole piece, reduces the polarization in battery charge and discharge process
Current density improves large current charge or low temperature charging cathode pole piece analysis lithium risk, improves the safe handling of battery.This
Scheme of the invention is easy to operate and pole piece hole is easy to control, high production efficiency, and will not lose battery energy density.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (3)
1. a kind of lithium ion battery electrode piece characterized by comprising collector and coating layer of active substance；The active matter
Matter coating uniform is coated in collector two sides, and the coating layer of active substance surface of the two sides is symmetrically uniformly distributed groove；
The coating layer of active substance of the two sides is with a thickness of 200 μm to 300 μm；The groove be cone-shaped groove, wedge-shaped impression or
One of square groove is a variety of；The trench gap range is 100 μm to 500 μm；The collector is metal aluminum foil, gold
Belong to one of copper foil, conductive coating aluminium foil or conductive coating copper foil；
The groove is prepared by specific boss roll shaft roll-in or the cold pressing of specific boss plate；The roll shaft surface is uniformly distributed
Boss, on the coating layer of active substance surface of the pole piece two sides, symmetrically roll-in is symmetrically uniformly distributed roll-in pole piece out in the process
Groove；The equally distributed boss in roll shaft surface is conical boss, wedge-shaped one of boss or square boss or a variety of；
The boss interstice coverage is 100 μm to 500 μm；The roll shaft is prepared using laser ablation cylindrical roll shaft.
2. a kind of pole piece rolling device, which is characterized in that the pole piece rolling device be used to prepare lithium described in claim 1 from
Sub- cell electrode piece；It include: the equally distributed boss of roll shaft and roll shaft surface；The roll shaft surface is uniformly distributed boss,
On the coating layer of active substance surface of the pole piece two sides, symmetrically roll-in is symmetrically uniformly distributed groove out during roll-in pole piece；
The equally distributed boss in roll shaft surface is conical boss, wedge-shaped one of boss or square boss or a variety of；It is described
Boss interstice coverage is 100 μm to 500 μm；The roll shaft is prepared using laser ablation cylindrical roll shaft.
3. a kind of lithium ion battery, comprising: anode pole piece, cathode pole piece, isolation film, shell and electrolyte, which is characterized in that
The coating layer of active substance surface of the anode pole piece two sides is symmetrically uniformly distributed groove；The active matter of the cathode pole piece two sides
Matter coating surface is uniformly distributed groove；
The collector of the anode pole piece is metal aluminum foil, and the aluminum foil thickness is 10 μm to 15 μm；The collection of the cathode pole piece
Fluid is metal copper foil, and the copper thickness is 6 μm to 10 μm；The active material painting of the anode pole piece, cathode pole piece two sides
Layer is 200 μm to 300 μm；
The anode pole piece positive active material, conductive agent, binder mass ratio be 93~97:2~5:1~3；The cathode
Pole piece negative electrode active material, conductive agent, binder mass ratio are 91~95:2~5:3~6；
The groove is one of cone-shaped groove, wedge-shaped impression or square groove or a variety of；The trench gap range is
100 μm to 500 μm；
The groove is prepared by specific boss roll shaft roll-in or the cold pressing of specific boss plate；The roll shaft surface is uniformly distributed
Boss, on the coating layer of active substance surface of the pole piece two sides, symmetrically roll-in is symmetrically uniformly distributed roll-in pole piece out in the process
Groove；The equally distributed boss in roll shaft surface is conical boss, wedge-shaped one of boss or square boss or a variety of；
The boss interstice coverage is 100 μm to 500 μm；The roll shaft is prepared using laser ablation cylindrical roll shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026308.7A CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026308.7A CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106531961A CN106531961A (en) | 2017-03-22 |
| CN106531961B true CN106531961B (en) | 2019-07-23 |
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| CN201710026308.7A Active CN106531961B (en) | 2017-01-13 | 2017-01-13 | Lithium ion battery electrode piece, pole piece rolling device and lithium ion battery |
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