CN109449432A - Battery anode slice and its manufacturing method and lithium ion battery and its manufacturing method - Google Patents

Battery anode slice and its manufacturing method and lithium ion battery and its manufacturing method Download PDF

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Publication number
CN109449432A
CN109449432A CN201811072008.3A CN201811072008A CN109449432A CN 109449432 A CN109449432 A CN 109449432A CN 201811072008 A CN201811072008 A CN 201811072008A CN 109449432 A CN109449432 A CN 109449432A
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China
Prior art keywords
battery
positive
cathode
anode
diaphragm
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CN201811072008.3A
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Inventor
黄国文
李亮
欧瑞先
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Shenzhen Zhuoneng New Energy Co Ltd
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Shenzhen Zhuoneng New Energy Co Ltd
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Priority to CN201811072008.3A priority Critical patent/CN109449432A/en
Publication of CN109449432A publication Critical patent/CN109449432A/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
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention is suitable for field of batteries, discloses the manufacturing method of battery anode slice, the manufacturing method of battery anode slice, lithium ion battery and lithium ion battery, wherein the width of battery anode slice is 65mm ± 5mm；Battery anode slice include cathode metal substrate, with cathode metal substrate be conductively connected anode ear and coated on cathode metal substrate outside positive coating, positive coating includes the component of following parts by weight: positive active material 86.0%~98.6%；Positive conductive agent 0.4%~16.0%；Positive electrode binder 1.0%~6.0%；Positive conductive agent includes at least one of the agent of graininess positive conductive and fibrous positive conductive agent.The present invention is optimized by the component of width and anode on piece anode coating to battery anode slice, to improve the capacity of battery anode slice, the resistance of battery anode slice is reduced, and then is conducive to promote capacity, cycle performance and the security performance of lithium ion battery.

Description

Battery anode slice and its manufacturing method and lithium ion battery and its manufacturing method
Technical field
The present invention relates to field of batteries more particularly to a kind of battery anode slice, the battery anode slice manufacturing method, have The manufacturing method of the lithium ion battery of the battery anode slice and the lithium ion battery.
Background technique
In recent years, market requires the course continuation mileage of new-energy automobile higher and higher, and national Ministry of Industry and Information is for new as a result, The energy density of the power resources of energy automobile --- lithium ion battery proposes specific requirement, that is, arrives the year two thousand twenty and realize battery Monomer energy density reaches 300WH/kg.In the prior art, the width of 18650 type based lithium-ion battery positive plates is 55mm-56mm, Due to the bottleneck of lithium ion battery material technology, 18650 type lithium ion battery energy densities have arrived at the limit, are difficult to mention again It is high, it is difficult to meet in the market to the requirement of battery capacity.
Summary of the invention
The first purpose of this invention is to provide a kind of battery anode slice, aims to solve the problem that existing capacity of lithium ion battery Small technical problem.
In order to achieve the above objectives, scheme provided by the invention is: battery anode slice, and width is 65mm ± 5mm, the electricity Pond positive plate includes cathode metal substrate, the anode ear being conductively connected with the cathode metal substrate and is coated on the anode gold Belong to the positive coating outside substrate, the anode coating includes the component of following parts by weight:
Positive active material 86.0%~98.6%；
Positive conductive agent 0.4%~16.0%；
Positive electrode binder 1.0%~6.0%；
The positive conductive agent includes at least one of the agent of graininess positive conductive and fibrous positive conductive agent.
Optionally, the positive coating includes the component of following parts by weight: positive active material 95.0%；Positive conductive Agent 3.0%；Positive electrode binder 2.0%；Alternatively,
The anode coating includes the component of following parts by weight: positive active material 95.7%；Positive conductive agent 2.5%；Positive electrode binder 1.8%；Alternatively,
The anode coating includes the component of following parts by weight: positive active material 95.3%；Positive conductive agent 2.5%；Positive electrode binder 2.2%.
Optionally, the positive active material is LiM1O2、xLi2MnO3·(1-x)LiM1O2, spinel structure material, have At least one of compound-material of polyanionic structure, the spinel structure material are LiMn2O4Or LiMn1.5Ni0.5O4, the compound-material for having polyanionic structure is LiM2PO4Either phosphoric acid vanadium lithium or fluorinated phosphate vanadium Lithium or Li2M3SiO4, wherein M1For at least one of Co, Ni, Mn, Al, M2For at least one of Fe, Mn, M3For Fe, At least one of Co, Mn, 0 < x < 1；And/or
The positive conductive agent includes the agent of graininess positive conductive and fibrous positive conductive agent, and the graininess anode is led Electric agent and fibrous positive conductive agent parts by weight shared in the positive coating are respectively 0.2%~8.0% He 0.2%~8.0%, the graininess positive conductive agent is electrically conductive graphite or conductive carbon black, the threadiness positive conductive agent For the combination of carbon nanotube or carbon fiber or carbon nanotube and graphene；And/or
The positive electrode binder is Kynoar or polyvinyl alcohol；And/or
The cathode metal substrate with a thickness of 12 μm ± 2 μm, the battery anode slice with a thickness of 190 μm ± 5 μm； And/or
The cathode metal substrate is aluminium foil；And/or
The anode coating includes the positive top coat layer that two intervals are coated on the top surface of the cathode metal substrate The positive bottom coat of the bottom surface of the cathode metal substrate, and two positive top coatings are coated on two intervals The gap between gap and two positive bottom coats between layer is arranged in upper and lower face position, the anode ear welding In in the gap of two positive top coat layers.
Second object of the present invention is to provide a kind of manufacturing method of above-mentioned battery anode slice comprising following step It is rapid:
The positive active material, the positive conductive agent, the positive electrode binder are pressed institute by anode sizing agent preparation step State the weight part ratio in positive coating and be put into n-methlpyrrolidone solvent and mix, be made solid content be 40%~ 75% anode sizing agent；
The anode sizing agent is coated on the cathode metal substrate by anode sizing agent coating step, and anode coating is made Intermediate products；
The anode coating intermediate products are placed in 120 DEG C~150 DEG C of environment by anode sizing agent dry solidification step Solidification is dried, is the positive coating by the anode sizing agent dry solidification, anode solidification intermediate products is made；
Positive plate procedure of processing successively carries out roll-in to the anode solidification intermediate products, cuts and process, positive plate is made Semi-finished product；
Anode ear welding step welds anode ear on the positive plate semi-finished product, the battery anode slice is made.
Optionally, the embodiment of the anode sizing agent coating step are as follows: in the top surface and bottom of the cathode metal substrate Face is respectively separated the coating anode sizing agent, to form two spaced anode tops in the top surface of the cathode metal substrate Portion's coat forms two spaced positive bottom coats in the bottom surface of the cathode metal substrate, and described in two The gap between gap and two positive bottom coats between positive top coat layer is arranged in upper and lower face position；Institute It states in anode ear welding step, the anode ear is welded in two positive top coat layers of the positive plate semi-finished product In gap；And/or
In the anode sizing agent preparation step, the solid content of the anode sizing agent is 67% or 70% or 71%；And/or
The embodiment of the positive plate procedure of processing are as follows: it is 190 μm ± 5 μm that the anode, which is solidified intermediate products roll-in, First sheet body, is cut to the strip sheet body of 65mm ± 5mm wide by the first thick sheet body, be made the positive plate half at Product.
Third object of the present invention is to provide a kind of lithium ion battery comprising battery case, battery cathode sheet, One diaphragm, the second diaphragm, electrolyte and above-mentioned battery anode slice, the battery anode slice, the battery cathode sheet, described One diaphragm, second diaphragm and the electrolyte are all set in the battery case, and the battery anode slice, the battery Negative electrode tab, first diaphragm, second diaphragm are all dipped in the electrolyte, and the battery cathode sheet is located at the battery Between positive plate and the battery case, first diaphragm is set between the battery anode slice and the battery cathode sheet, Second diaphragm is set between the battery case and the battery cathode sheet, and the battery cathode sheet includes negative metal base Piece and coated on the cathode coating outside the negative metal substrate, the cathode coating includes the component of following parts by weight:
Negative electrode active material 86.0%~97.0%；
Cathode conductive agent 0.2%~6.0%；
Suspending agent 1.2%~4.0%；
Negative electrode binder 1.4%~3.4%.
Optionally, the cathode coating includes the component of following parts by weight: negative electrode active material 94.5%, negative conductive Agent 2.0%, suspending agent 1.5%, negative electrode binder 2.0%；Alternatively,
The cathode coating includes the component of following parts by weight: negative electrode active material 94.6%, cathode conductive agent 2.1%, suspending agent 1.4%, negative electrode binder 1.9%；Alternatively,
The cathode coating includes the component of following parts by weight: negative electrode active material 94.2%, cathode conductive agent 2.2%, suspending agent 1.6%, negative electrode binder 2.0%.
Optionally, the negative electrode active material is graphite powder, silicon based composite material, nitride, titanium type oxide, metal oxygen At least one of compound, alloy material；And/or
The cathode conductive agent is conductive carbon black or electrically conductive graphite or carbon nanotube；And/or
The negative electrode binder is sodium carboxymethylcellulose or butadiene-styrene rubber or polyacrylic acid or sodium alginate； And/or
The suspending agent is sodium carboxymethylcellulose；And/or
The width of the battery cathode sheet is 66.5mm ± 5mm and the width greater than the battery anode slice, described first The width of the width of diaphragm and second diaphragm is both greater than the width of the battery cathode sheet and is all 68.5mm ± 5mm；And/ Or,
The negative metal substrate with a thickness of 8 μm ± 2 μm, the battery cathode sheet with a thickness of 130 μm ± 5 μm；And/ Or,
The negative metal substrate is copper foil；And/or
The battery case is cylindrical, and the outer diameter of the battery case is 18.25mm ± 0.35mm, the battery case Height be 73mm ± 5mm；And/or
First diaphragm and second diaphragm be all polypropylene screen or polyethylene film or polypropylene screen, polyethylene film, The sandwich diaphragm of polypropylene screen.
Fourth object of the present invention is to provide a kind of manufacturing method of above-mentioned lithium ion battery, include the following steps: The battery case, the battery anode slice, the battery cathode sheet, first diaphragm, second diaphragm are prepared respectively With the electrolyte, the battery case, battery anode slice, the battery cathode sheet, first diaphragm, described is assembled Second diaphragm and the electrolyte, the battery anode slice are prepared using the manufacturing method of above-mentioned battery anode slice；
The battery cathode sheet is prepared using following steps:
Negative electrode slurry preparation step, by the negative electrode active material, the cathode conductive agent, the negative electrode binder, institute State suspending agent by the weight part ratio in cathode coating be put into deionized water be uniformly mixed, be made solid content be 45%~ 55% negative electrode slurry；
The negative electrode slurry is coated on the negative metal substrate, by the cathode by negative electrode slurry coating step Slurry dry solidification is the cathode coating, and cathode is made and coats intermediate products；
Cathode coating intermediate products are placed in 100 DEG C~130 DEG C of environment by negative electrode slurry dry solidification step Solidification is dried, cathode is made and solidifies intermediate products；
Negative electrode tab procedure of processing successively carries out roll-in to cathode solidification intermediate products, cuts and process, negative electrode tab is made Semi-finished product；
Negative pole lug welding step welds negative electrode lug on the negative electrode tab semi-finished product, the battery cathode sheet is made.
Optionally, the battery case, the battery anode slice, the battery cathode sheet, first diaphragm, described The assembling mode of two diaphragms and the electrolyte are as follows: by the battery anode slice, the battery cathode sheet, first diaphragm and Second diaphragm according to the second diaphragm, battery cathode sheet, the first diaphragm, battery anode slice laminated structure after be wound into cylinder The cylindric pole group core is assemblied in the battery case, semi-finished product battery core is made by shape pole group core, by described half at Product battery core is toasted 24 hours；Electrolyte is injected in the semi-finished product cell in-core, then the semi-finished product battery core is sealed, is made Obtain semi-finished product battery；Infiltration is just put after the semi-finished product battery is first inverted infiltration under 30 DEG C~45 DEG C of constant temperature Mode carries out infiltration activation 40 hours, then charges and is melted into the semi-finished product battery, the lithium ion battery is made.
Battery anode slice provided by the invention and its manufacturing method and lithium ion battery and its manufacturing method, by increasing electricity The width of pond positive plate improves the dressing amount of positive active material；Pass through the group to anode on piece anode coating simultaneously Divide and optimizes, so that the adhesive force of the capacity and positive coating of battery anode slice on cathode metal substrate is improved, The resistance of battery anode slice is reduced, and then is conducive to promote capacity, cycle performance and the security performance of lithium ion battery.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is schematic view of the front view of the battery anode slice provided in an embodiment of the present invention before welding anode ear；
Fig. 2 is overlooking structure diagram of the battery anode slice provided in an embodiment of the present invention before welding anode ear；
Fig. 3 is schematic view of the front view of the battery anode slice provided in an embodiment of the present invention after welding anode ear；
Fig. 4 is overlooking structure diagram of the battery anode slice provided in an embodiment of the present invention after welding anode ear；
Fig. 5 is the schematic diagram of internal structure of lithium ion battery provided in an embodiment of the present invention；
Fig. 6 is the external structure schematic diagram of lithium ion battery provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
It should also be noted that, when an element is referred to as being " fixed " or " disposed " on another element, it can be straight Connect on the other element or may be simultaneously present centering elements.When an element is known as " connection " another element, It, which can be, is directly connected to another element or may be simultaneously present centering elements.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result, Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model Within enclosing.
As shown in figures 1 to 6, battery anode slice 1 provided in an embodiment of the present invention, width L are 65mm ± 5mm；Anode Piece 1 includes cathode metal substrate 11, with the anode ear 13 of the conductive connection of cathode metal substrate 11 and coated on cathode metal substrate Positive coating 12 outside 11, positive coating 12 include the component of following parts by weight:
Positive active material 86.0%~98.6%；
Positive conductive agent 0.4%~16.0%；
Positive electrode binder 1.0%~6.0%；
Positive conductive agent includes at least one of the agent of graininess positive conductive and fibrous positive conductive agent.
Battery anode slice 1 provided in an embodiment of the present invention, relative to the lithium ion battery of existing 18650 type, anode The width L of piece 1 is increased, to improve the dressing amount of positive active material；Simultaneously by the component to positive coating 12 into Row optimization design improves the adhesive force of the capacity and positive coating 12 of battery anode slice 1 on cathode metal substrate 11, reduces The resistance of battery anode slice 1, and then be conducive to promote capacity, cycle performance and the security performance of lithium ion battery.
Specifically, battery anode slice 1 is rectangular sheet before winding, and the size of the rectangular sheet short side is anode The width L of piece 1.Battery anode slice 1 is after the coiling cylindrical sheet body, and the height of the cylinder sheet body is battery anode slice 1 Width L.The width L of battery anode slice 1 is arranged within the scope of 65mm ± 5mm the present embodiment, on the one hand effectively increases The width of battery anode slice 1, the height H for the lithium ion battery being on the other hand finally made convenient for control, another further aspect are conducive to protect After demonstrate,proving battery anode slice 1 and the winding of battery cathode sheet 3, battery cathode sheet 3 can encase battery anode slice 1 completely, be conducive to ensure The security performance of lithium ion battery.
Preferably, positive coating 12 includes the component of following parts by weight: positive active material 95.0%；Positive conductive agent 3.0%；Positive electrode binder 2.0%；Alternatively, positive coating 12 includes the component of following parts by weight: positive active material 95.7%；Positive conductive agent 2.5%；Positive electrode binder 1.8%；Alternatively, positive coating 12 includes the component of following parts by weight: Positive active material 95.3%；Positive conductive agent 2.5%；Positive electrode binder 2.2%.Through experimental test it is found that positive coating 12 Using the component of these parts by weight, 1 capacity of raising battery anode slice obtained improves positive coating 12 in cathode metal base The effect of adhesive force and reduction by 1 resistance of battery anode slice is all than more significant on piece 11.
Preferably, positive active material LiM1O2、xLi2MnO3·(1-x)LiM1O2, spinel structure material, have poly- yin At least one of compound-material of ionic structure (any one or any combination), spinel structure material are LiMn2O4 Or LiMn1.5Ni0.5O4, the compound-material for having polyanionic structure is LiM2PO4Either phosphoric acid vanadium lithium or fluorinated phosphate vanadium Lithium or Li2M3SiO4, wherein M1For at least one of Co, Ni, Mn, Al, M2For at least one of Fe, Mn, M3For Fe, At least one of Co, Mn, 0 < x < 1.LiM1O2For lithium metal oxide, xLi2MnO3·(1-x)LiM1O2For high capacity richness lithium Material, spinel structure material can be 4V grades of LiMn2O4Or 5V grades of LiMn1.5Ni0.5O4Deng.Herein, by living to anode Property substance material optimize, conducive to guarantee battery anode slice 1 capacity.
Preferably, positive conductive agent includes the agent of graininess positive conductive and fibrous positive conductive agent, and graininess anode is led Electric agent and fibrous positive conductive agent parts by weight shared in the positive coating are respectively 0.2%~8.0% He 0.2%~8.0%.Herein, simultaneously using granular conductive agent and fibrous conductive agent in the positive coating 12 of battery anode slice 1 Two different conductive agents are used cooperatively, since the two is had any different in partial size, specific surface area, configuration state, conductive effect, therefore two Person combines mutual reinforcement, there is the effect of one-plus-one is greater than two, to be conducive to reduce the internal resistance of battery, improves battery capacity, circulation Performance and high rate performance.
Preferably, the agent of graininess positive conductive is electrically conductive graphite or conductive carbon black.Herein, by being led to graininess anode The material of electric agent optimizes, and is conducive to cooperate with fibrous positive conductive agent in this way, effectively reduces the internal resistance of battery.
It is further preferable that graininess positive conductive agent is conductive carbon black 350G, SP-Li, acetylene black, Ketjen black, conductive stone Black KS-6, electrically conductive graphite KS-15, electrically conductive graphite SFG-6, any one in electrically conductive graphite SFG-15.
Preferably, fibrous positive conductive agent be carbon nanotube (CNT) either carbon fiber (VGCF) or carbon nanotube with The combination of graphene.Herein, by being optimized to the material of fibrous positive conductive agent, it is conducive in this way with graininess just The cooperation of pole conductive agent, effectively reduces the internal resistance of battery.
Preferably, positive electrode binder is Kynoar PVDF or PVAC polyvinylalcohol, and positive electrode binder uses both Binder, it is ensured that positive coating 12 has good adhesive property with cathode metal substrate 11.
Preferably, the thickness t of cathode metal substrate 111It is 12 μm ± 2 μm, the thickness t of battery anode slice 12It is 190 μm ± 5 μm, in this way, under the premise of guaranteeing that 1 figure of battery anode slice is lesser, conducive to the optimum performance for playing positive active material.
Preferably, cathode metal substrate 11 is aluminium foil, can meet the electric conductivity requirement of battery anode slice 1, and matter Amount is light, at low cost.
Preferably, positive coating 12 includes the positive top coating that two intervals are coated on the top surface of cathode metal substrate 11 Layer 121 and two intervals are coated on the positive bottom coat 122 of the bottom surface of cathode metal substrate 11, and two anode tops apply The gap between gap and two positive bottom coats 122 between coating 121 is arranged in upper and lower face position, and anode ear 13 welds It is connected in the gap of two positive top coat layers 121.Herein, by being applied to cathode metal substrate 11, anode ear 13 and anode The relative position of layer 12 optimizes, and anode ear 13 is welded in the gap of two positive top coat layers 121, can be made The lithium ion battery internal resistance that must be finally made is small, is conducive to circulation.
Further, the embodiment of the invention also provides the manufacturing methods of above-mentioned battery anode slice 1 comprising following step It is rapid:
Anode sizing agent preparation step presses positive active material, positive conductive agent, positive electrode binder in positive coating 12 Weight part ratio is put into n-methlpyrrolidone (NMP) solvent and mixes, and the anode slurry that solid content is 40%~75% is made Material；
Anode sizing agent is coated on cathode metal substrate 11 by anode sizing agent coating step, is made among anode coating and is produced Product；
Anode coating intermediate products are placed in 120 DEG C~150 DEG C of environment and carry out by anode sizing agent dry solidification step Anode sizing agent dry solidification is positive coating 12 by dry solidification, and anode solidification intermediate products are made；
Positive plate procedure of processing successively carries out roll-in to anode solidification intermediate products, cuts and process, be made positive plate half at Product；
Anode ear welding step welds anode ear 13 on positive plate semi-finished product, and battery anode slice 1 is made.
In the manufacturing method of battery anode slice 1 provided in an embodiment of the present invention, solvent is molten using n-methlpyrrolidone The solid content of agent, anode sizing agent is set as 40%~75%, is by anode sizing agent dry solidification in 120 DEG C~150 DEG C of environment Positive coating 12 is not only convenient for coating operation of the anode sizing agent on cathode metal substrate 11, but also is conducive to guarantee the dry of anode sizing agent Dry curing efficiency is very fast.The manufacturing method of battery anode slice 1 provided in an embodiment of the present invention, manufacturing process is simple, production effect Rate is high, and thus obtained battery anode slice 1, and the capacity of battery anode slice 1 is high, and positive coating 12 is on cathode metal substrate 11 Adhesive force it is strong, the resistance of battery anode slice 1 is low, conducive to promoted lithium ion battery capacity, cycle performance and security performance.
Preferably, the embodiment of anode sizing agent coating step are as follows: distinguish in the top and bottom of cathode metal substrate 11 Interval coating anode sizing agent, to form two spaced positive top coat layers 121 in the top surface of cathode metal substrate 11, Two spaced positive bottom coats 122, and two positive top coatings are formed in the bottom surface of cathode metal substrate 11 The gap between gap and two positive bottom coats 122 between layer 121 is arranged in upper and lower face position.Using this coating Mode is primarily to facilitate and reserves welding position to anode ear 13.
Preferably, in anode ear welding step, anode ear 13 is welded in two positive top coatings of positive plate semi-finished product In the gap of layer 121.In this way, being conducive to guarantee that the conductive contact with cathode metal substrate 11 may be implemented in anode ear 13.
Preferably, in anode sizing agent preparation step, the solid content of anode sizing agent is 67% or 70% or 71%, in this way Conducive to the paintability and dry solidification efficiency for combining anode sizing agent.
Preferably, the embodiment of positive plate procedure of processing are as follows: it is 190 μm ± 5 μm that anode, which is solidified intermediate products roll-in, First sheet body, is cut to the strip sheet body of 65mm ± 5mm wide by the first thick sheet body, and positive plate semi-finished product are made.
Further, the embodiment of the invention also provides a kind of lithium ion batteries comprising battery case 2, battery cathode Piece 3, the first diaphragm 4, the second diaphragm 5, electrolyte and above-mentioned battery anode slice 1, battery anode slice 1, battery cathode sheet 3, One diaphragm 4, the second diaphragm 5 and electrolyte are all set in battery case 2, and battery anode slice 1, battery cathode sheet 3, the first diaphragm 4, the second diaphragm 5 is all dipped in electrolyte, and battery cathode sheet 3 is between battery anode slice 1 and battery case 2, the first diaphragm 4 Between battery anode slice 1 and battery cathode sheet 3, the second diaphragm 5 is set between battery case 2 and battery cathode sheet 3.This hair The lithium ion battery that bright embodiment provides, due to using above-mentioned battery anode slice 1, therefore, effectively promote lithium ion battery Capacity, cycle performance and security performance.
Preferably, battery cathode sheet 3 is born including negative metal substrate and coated on the cathode coating outside negative metal substrate Pole coating includes the component of following parts by weight: negative electrode active material 86.0%~97.0%；Cathode conductive agent 0.2%~ 6.0%；Suspending agent 1.2%~4.0%；Negative electrode binder 1.4%~3.4%.Herein, it is carried out by the component to cathode coating Optimization design improves the adhesive force of the capacity and cathode coating of battery cathode sheet 3 on negative metal substrate, reduces battery The resistance of negative electrode tab 3, and then be conducive to further promote capacity, cycle performance and the security performance of lithium ion battery.In addition, suspending The setting of agent can keep cathode conductive agent, negative electrode active material well dispersed and in suspension in the negative electrode slurry made State ensures the stability of negative electrode slurry following process process (coating procedure), and cathode conductive agent is avoided to occur to reunite, avoid cathode Active material sedimentation.
Preferably, cathode coating includes the component of following parts by weight: negative electrode active material 94.5%, cathode conductive agent 2.0%, suspending agent 1.5%, negative electrode binder 2.0%.Alternatively, cathode coating includes the component of following parts by weight: cathode is living Property substance 94.6%, cathode conductive agent 2.1%, suspending agent 1.4%, negative electrode binder 1.9%；Alternatively, cathode coating includes such as The component of lower parts by weight: negative electrode active material 94.2%, cathode conductive agent 2.2%, suspending agent 1.6%, negative electrode binder 2.0%.Through experimental test it is found that cathode coating uses the component of these parts by weight, the raising battery cathode sheet 3 obtained holds Amount, improve cathode coating on negative metal substrate adhesive force and reduce by 3 resistance of battery cathode sheet effect all than more significant.
Preferably, negative electrode active material is graphite powder, silicon based composite material, nitride, titanium type oxide, metal oxidation At least one of object, alloy material.Graphite powder concretely natural graphite powder or graphous graphite powder；Nitride is concretely Li3-yMyN, wherein any one in M Mn, Cu, Ni, Co, Fe, 0 < y < 3；Metal oxide concretely Sn, Co, The oxide of the metals such as Fe, Ni, Ti, Cu, Mo, Mn；Alloy material concretely aluminum-based alloy material, kamash alloy material, silicon Any one in base alloy material.Herein, it is optimized by the material to negative electrode active material, has fully ensured that electricity The capacity of pond negative electrode tab 3.
Preferably, cathode conductive agent is conductive carbon black or electrically conductive graphite or carbon nanotube.Herein, by being led to cathode The material of electric agent optimizes, conducive to the internal resistance for reducing battery.
It is further preferable that cathode conductive agent be conductive carbon black 350G, SP-Li, electrically conductive graphite KS-6, electrically conductive graphite SFG-6, Ketjen black ECP, Ketjen black ECP-600JD, any one in carbon nanotube CNT.
Preferably, negative electrode binder is sodium carboxymethylcellulose (CMC) either butadiene-styrene rubber (SBR) or polyacrylic acid (PAA) or sodium alginate.Herein, optimized by the material to negative electrode binder, be conducive to guarantee cathode coating with Negative metal substrate has good adhesive property.
Preferably, suspending agent is sodium carboxymethylcellulose (CMC).Herein, suspending agent uses sodium carboxymethylcellulose, in addition to Cathode conductive agent, negative electrode active material can be made to be in outside suspended state in the negative electrode slurry made, meanwhile, using carboxymethyl The cementitiousness of sodium cellulosate acts synergistically with negative electrode binder, improves cathode coating each group after battery cathode sheet 3 is dried and divides it Between and the adhesive force between cathode coating and negative metal substrate.
Preferably, the width of battery cathode sheet 3 is 66.5mm ± 5mm and is greater than the width L of battery anode slice 1, first every The width of the width of film 4 and the second diaphragm 5 is both greater than the width of battery cathode sheet 3 and is all 68.5mm ± 5mm.Just due to battery The width of pole piece 1 be 65mm ± 5mm, therefore, herein, by the width to battery cathode sheet 3, the first diaphragm 4 and the second diaphragm 5 into Row optimization design is conducive to after guaranteeing that battery anode slice 1 and battery cathode sheet 3 are wound, and battery cathode sheet 3 can encase battery completely Positive plate 1, diaphragm can be with completely separated battery anode slice 1 and battery cathode sheet 3, and diaphragm can envelope battery cathode completely Piece 3 has sufficiently ensured the security performance of lithium ion battery.
Preferably, negative metal substrate with a thickness of 8 μm ± 2 μm, battery cathode sheet 3 with a thickness of 130 μm ± 5 μm, this Sample, under the premise of guaranteeing that 3 figure of battery cathode sheet is lesser, conducive to the optimum performance for playing negative electrode active material.
Preferably, negative metal substrate is copper foil, and electric conductivity is good, can meet the electric conductivity of battery cathode sheet 3 It is required that.
Preferably, cathode coating includes the cathode top coat layer of the top surface coated on negative metal substrate and is coated on negative The cathode bottom coat of the bottom surface of pole metal substrate, negative pole lug welding in negative metal substrate top surface and be located at cathode at the top of The side of coat.In this way, when being convenient for cell package, welding of the negative electrode lug in nickel plated steel shell bottom.
Preferably, cathode top coat layer is coated in the coated area of negative metal substrate surface greater than the cathode bottom Coated area of the layer in negative metal substrate surface.Herein, wide arc gap is stayed to be not coated by negative metal substrate bottom surface, due in electricity In the assembling process of pond, after battery cathode sheet winding, the non-coated of negative metal substrate bottom surface is aligned in core outmost turns with it Be nickel plated steel shell, without positive electrode, in this way, under the premise of guaranteeing battery performance, conducive to cost is reduced.
Preferably, negative metal substrate is rectangular sheet, and there are two be spaced opposite long outer edge and two intervals for tool Opposite short outer edge, negative electrode lug are welded in the top surface of negative metal substrate, cathode top coat layer close to a short outer edge The side of negative electrode lug, one end and cathode top of cathode bottom coat are extended to from another short outer edge of negative metal substrate The end close to negative electrode lug of portion's coat is in the setting of upper and lower face position, the other end and cathode top coat layer far from negative electrode lug End have 54.56mm ± 5mm distance.Herein, by the position to negative metal substrate, cathode coating and negative electrode lug into Row optimization design can not only reduce the dosage of cathode coating, but also be conducive to guarantee the performance for the lithium ion battery being finally made.
Preferably, battery case 2 is cylindrical, and the outside diameter d of battery case 2 is 18.25mm ± 0.35mm, battery case 2 Height H be 73mm ± 5mm.Herein, it is optimized by the shape to battery case 2, is conducive to save packaging (Pack) Cost improves packaging efficiency, and may make that the battery pack of battery pack is smaller, lighter.
Preferably, the first diaphragm 4 and the second diaphragm 5 are all polypropylene film or polyethylene film or poly- third with micropore Alkene, polyethylene, polyacrylic three layers of laminated film.
As a preferred embodiment of the present embodiment, lithium ion battery is cylindrical type, outside diameter d is 18.25 ± 0.35mm, height H are 73.0 ± 5.0mm, realize battery weight energy density and volume energy density all than 18650 type lithium ions Battery promotes 11%~16% beneficial effect, can replace 18650 type lithium ion battery applications in number, power, energy storage Etc. market segments.
Lithium ion battery provided in an embodiment of the present invention changes the group of coating on battery anode slice 1 and battery cathode sheet 3 Point, increase the width of battery anode slice 1 and battery cathode sheet 3, so that the dressing amount of active material is improved, so as to improve battery appearance Amount；Increase the width of the first diaphragm 4 and the second diaphragm 5, completely separated battery anode slice 1 and battery cathode sheet 3 and fully wrapped around Firmly battery cathode sheet 3 ensure the security performance of lithium ion battery；In addition, improving the reservoir quantity of lithium-ion battery electrolytes, ensure Electrolyte content infiltrates battery anode slice 1, battery cathode sheet 3, the first diaphragm 4 and the second diaphragm 5 enough.
Further, the embodiment of the invention also provides the manufacturing method of above-mentioned lithium ion battery, include the following steps: point Battery case 2, battery anode slice 1, battery cathode sheet 3, the first diaphragm 4, the second diaphragm 5 and electrolyte, assembled battery are not prepared Shell 2, battery anode slice 1, battery cathode sheet 3, the first diaphragm 4, the second diaphragm 5 and electrolyte, battery anode slice 1 is using above-mentioned Battery anode slice 1 manufacturing method preparation.The embodiment of the present invention, due to using the manufacturer of above-mentioned battery anode slice 1 Method prepares battery anode slice 1, therefore, the manufacturing process of lithium ion battery is effectively optimized, and promote the capacity of lithium ion battery, follow Ring performance and security performance.
Preferably, battery cathode sheet 3 is prepared using following steps:
Negative electrode slurry preparation step, by weight by negative electrode active material, cathode conductive agent, negative electrode binder, suspending agent Number ratio, which is put into deionized water, to be uniformly mixed, and the negative electrode slurry that solid content is 45%~55% is made；
Negative electrode slurry is coated on negative metal substrate by negative electrode slurry coating step, and cathode is made and coats intermediate products；
Cathode coating intermediate products are placed in 100 DEG C~130 DEG C of environment and carry out by negative electrode slurry dry solidification step Dry solidification is made cathode and solidifies intermediate products；
Negative electrode tab procedure of processing successively carries out roll-in to cathode solidification intermediate products, cuts and process, be made negative electrode tab half at Product；
Negative pole lug welding step welds negative electrode lug 31 on negative electrode tab semi-finished product, and battery cathode sheet 3 is made.
In the manufacturing method of battery cathode sheet 3 provided in an embodiment of the present invention, solvent uses deionized water, negative electrode slurry Solid content is set as 45%~55%, in 100 DEG C~130 DEG C of environment by negative electrode slurry dry solidification be cathode coating, both just In coating operation of the negative electrode slurry on negative metal substrate, and it is conducive to guarantee that the dry solidification efficiency of negative electrode slurry is very fast.This The manufacturing method for the battery cathode sheet 3 that inventive embodiments provide, manufacturing process is simple, high production efficiency, and thus obtained The capacity of battery cathode sheet 3, battery cathode sheet 3 is high, and adhesive force of the cathode coating on negative metal substrate is strong, battery cathode sheet 3 resistance is low, conducive to capacity, cycle performance and the security performance for promoting lithium ion battery.
Preferably, the embodiment of negative electrode slurry coating step are as follows: between the difference of the top and bottom of negative metal substrate Every coating negative electrode slurry, to form at least two spaced cathode top coat layers in the top surface of negative metal substrate, The bottom surface of negative metal substrate forms at least two spaced cathode bottom coats.Using this coating method, mainly It is easy for reserving welding position to negative electrode lug 31.
Preferably, in negative pole lug welding step, negative electrode lug 31 is welded in two cathode top coatings of negative electrode tab semi-finished product In the gap of layer.In this way, being conducive to guarantee that the conductive contact with negative metal substrate may be implemented in negative electrode lug 31.
Preferably, in negative electrode slurry preparation step, the solid content of negative electrode slurry is 50% or 48% or 52%, in this way Conducive to the paintability and dry solidification efficiency for combining negative electrode slurry.
Preferably, the embodiment of negative electrode tab procedure of processing are as follows: it is 130 μm ± 5 μm that cathode, which is solidified intermediate products roll-in, Second sheet body, is cut to the strip sheet body of 66.5mm ± 5mm wide by the second thick sheet body, and positive plate semi-finished product are made.
Preferably, battery case 2, battery anode slice 1, battery cathode sheet 3, the first diaphragm 4, the second diaphragm 5 and electrolyte Assembling mode are as follows: by battery anode slice 1, battery cathode sheet 3, the first diaphragm 4 and the second diaphragm 5 according to the second diaphragm 5, battery Negative electrode tab 3, the first diaphragm 4, battery anode slice 1 laminated structure after be wound into cylindric pole group core, by cylindric pole group roll up Core is assemblied in battery case 2, and semi-finished product battery core is made, and semi-finished product battery core is toasted 24 hours；It is injected in semi-finished product cell in-core Then electrolyte seals semi-finished product battery core, semi-finished product battery is made；Constant temperature by semi-finished product battery at 30 DEG C~45 DEG C Under the conditions of infiltration activation 40 hours, then double of finished battery chargingization are carried out in a manner of just putting infiltration after being first inverted infiltration At obtained lithium ion battery.Herein, it is optimized by the packaging technology to lithium ion battery, to effectively increase The comprehensive performance of lithium ion battery.Specifically, by increasing to the baking of semi-finished product battery core 24 hours, final system is reduced Obtain the water content of battery battery core；By the way that cell activation infiltrating time is increased to 40h, electrolyte can be made sufficiently to infiltrate diaphragm, electricity Pond positive plate 1 and battery cathode sheet 3；Meanwhile the activation pattern of invasion by improving battery, in 30 DEG C of -45 DEG C of constant temperatures Under, battery be first inverted infiltration, after just putting infiltration, to effectively increase effect of impregnation.
Preferably, battery case 2 includes nickel plated steel shell 21 and nut cap 22.Cylindric pole group core is assemblied in battery case The specific embodiment of semi-finished product battery core is made in 2 are as follows: cylindric pole group core is loaded in nickel plated steel shell 21, by negative electrode lug 31 It is welded to the bottom of nickel plated steel shell 21, then roller slot is carried out to nickel plated steel shell 21 by design parameter；13 Laser Welding of anode ear is welded At the confluence piece of nut cap 22, semi-finished product battery core is made.
In 21 design aspect of nickel plated steel shell, due to battery anode slice 1, battery cathode sheet 3, the first diaphragm 4 and the second diaphragm 5 Width all increase, cylindric pole group core height after winding increases, therefore, increase accordingly the height of nickel plated steel shell 21, from And the cavity volume of nickel plated steel shell 21 is improved, lower after having ensured 21 roller slot of nickel plated steel shell can accommodate cylinder along cavity completely Shape pole group core, while the processing performance of nickel plated steel shell 21 is improved, ensure nickel plated steel shell 21 in the stability of process.
The test result of lithium ion battery provided in an embodiment of the present invention are as follows: when with 0.2CA electric current to lithium ion battery into Row constant-current constant-voltage charging (cut-off current 0.01CA) carries out lithium ion battery to upper limit voltage, again with 0.2CA constant current When being discharged to lower voltage limit, discharge capacity of lithium ion battery is not less than nominal capacity；When with 0.5CA constant-current constant-voltage charging and 0.5CA constant-current discharge system to lithium ion battery carry out charge and discharge cycles test, the 300th week capacity of lithium ion battery conservation rate >= 78.5%.
Lithium ion battery provided in an embodiment of the present invention has as follows relative to the lithium ion battery of existing 18650 model Beneficial effect,
1) cell capacity is higher, can accomplish 4.6Ah；
2) battery energy density is higher.Single battery volume energy density and gravimetric energy density are all promoted than 18650 11%~16%, wherein gravimetric energy density reaches 320WH/kg, more than the target of the 300WH/kg of Ministry of Industry and Information's the year two thousand twenty；
3) lithium ion battery manufacturing cost is reduced.Lithium ion battery production procedure in the present embodiment, equipment depreciation, manually at This is identical as 18650 batteries, but in the present embodiment lithium ion battery capacity it is higher, calculate cost, this reality according to every watt-hour The manufacturing cost for applying lithium ion battery in example is lower；
4) packaging (Pack) cost is saved, packaging efficiency is improved.Compared to the lithium ion battery of 18650 models, this implementation The lithium ion battery that example provides, monomer lithium ion battery capacity boost 17%, in this way, required list in the case of equal energy output The quantity of body lithium ion battery can reduce 21%.Therefore, the cost for packing lithium ion battery reduces, and efficiency improves, manpower Cost also reduces.
5) battery pack of battery pack is smaller, lighter.Due to the promotion of volume energy density and gravimetric energy density, battery Pack that groups of space utilization rate is higher, the weight of battery group is lighter under identical energy, volume is smaller.
The manufacturing method and test process of lithium ion battery are described below by way of three preferred embodiments:
Embodiment 1:
The preparation of battery cathode sheet 3: by suspending agent dry powder 1.5%wt, graphite powder 94.5%wt, cathode conductive agent 2.0% Wt, negative electrode binder 2.0%wt are mixed, and are uniformly mixed after adding deionized water, and the cathode that solid content is 50% is made Slurry, on the intermittent metal copper foil for being coated in 8 μ m-thicks, 100 DEG C -130 DEG C at a temperature of it is dry after, be rolled into thickness about Second sheet body of 130 μ m-thicks, is cut into strip, and the blade width cut out is 66.5mm, and cathode is welded at the foil of gap Battery cathode sheet 3 is made in ear 31.
The preparation of battery anode slice 1: by positive electrode binder dry powder 2.0%wt, positive conductive agent 3.0%wt (wherein, particle Shape positive conductive agent 1.0%wt, fibrous positive conductive agent 2.0%wt), positive active material 95.0%wt and appropriate NMP it is mixed It closes, is made the anode sizing agent that solid content 67% is, on the intermittent metal aluminum foil for being coated in 12 μ m-thicks, in 120-150 DEG C of temperature After the lower drying of degree, it is rolled into the first sheet body of about 190 μ m-thick of thickness, is cut into strip, the width for cutting out sheet body is 65.0mm welds anode ear 13 at the foil of gap, battery anode slice 1 is made.
The assembling of lithium ion battery: by battery anode slice 1, battery cathode sheet 3, the first diaphragm 4 and the second diaphragm 5 according to Two diaphragms 5, battery cathode sheet 3, the first diaphragm 4, battery anode slice 1 laminated structure after be wound into cylindric pole group core, institute It is 68.5mm with the width of diaphragm (including the first diaphragm 4 and the second diaphragm 5).Cylindric pole group core is inserted in nickel plated steel shell 21 In, negative electrode lug 31 is welded to the bottom of nickel plated steel shell 21, then carry out roller slot by design parameter；13 Laser Welding of anode ear is welded At the confluence piece of nut cap 22, semi-finished product battery core is made.Semi-finished product battery core is toasted, electrolyte is injected, is carried out by design sealing parameter Semi-finished product battery is made in sealing；By semi-finished product cell activation, electrolyte is made sufficiently to infiltrate positive and negative pole material and diaphragm；According to change After being melted at technique to the charging of semi-finished product battery, that is, it is assembled into lithium ion battery.
The test of lithium ion battery: when carrying out constant-current constant-voltage charging to lithium ion with 0.2CA electric current, (cut-off current is When 0.01CA) carrying out being discharged to lower voltage limit to lithium ion battery to upper limit voltage, again with 0.2CA constant current, lithium ion is put Capacitance is not less than nominal capacity；18650 batteries are compared, realize that lithium ion gravimetric energy density promotes 9.81%, volume energy Density is respectively increased 9.24%；It is followed when carrying out charge and discharge to battery with 0.5CA constant-current constant-voltage charging and 0.5CA constant-current discharge system Ring test, the 300th week lithium ion capacity conservation rate >=78.5%.
Embodiment 2:
The preparation of battery cathode sheet 3: it by suspending agent dry powder 1.4%wt, graphite powder 94.6%wt, conductive agent 2.1%wt, bears Pole binder 1.9%wt is mixed, and is uniformly mixed after adding deionized water, and the negative electrode slurry that solid content is 48% is made, On the intermittent metal copper foil for being coated in 8 μ m-thicks, 100 DEG C -130 DEG C at a temperature of it is dry after, be rolled into about 125 μ m-thick of thickness The second pole piece, be cut into strip, the blade width cut out be 66.5mm, at the foil of gap weld negative electrode lug 31, system At battery cathode sheet 3.
The preparation of battery anode slice 1: by positive electrode binder dry powder 1.8%wt, positive conductive agent 2.5%wt (wherein, particle Shape positive conductive agent 1.0%wt, fibrous positive conductive agent 1.5%wt), positive active material 95.7%wt and appropriate NMP it is mixed It closes, solid content is made for 70% anode sizing agent, on the intermittent metal aluminum foil for being coated in 12 μ m-thicks, in 120-150 DEG C of temperature After the lower drying of degree, it is rolled into the first sheet body of about 192 μ m-thick of thickness, is cut into strip, the blade width cut out is 65.0mm welds anode ear 13 at the foil of gap, battery anode slice 1 is made.
The assembling of lithium ion battery: assembling mode is with embodiment 1, and this will not be detailed here.
The test of lithium ion battery: realize lithium ion battery gravimetric energy density and volume energy density than 18650 type lithiums Ion battery is respectively increased 13.81%, 13.61%；When with 0.5CA constant-current constant-voltage charging and 0.5CA constant-current discharge system to lithium Ion battery carries out charge and discharge cycles test, the 300th week capacity of lithium ion battery conservation rate >=79.0%.
Embodiment 3:
The preparation of battery cathode sheet 3: by suspending agent dry powder 1.6%wt, graphite powder 94.2%wt, cathode conductive agent 2.2% Wt, negative electrode binder 2.0%wt are mixed, and are uniformly mixed after adding deionized water, and the cathode that solid content is 52% is made Slurry, on the intermittent metal copper foil for being coated in 8 μ m-thicks, 100 DEG C -130 DEG C at a temperature of it is dry after, be rolled into thickness about Second sheet body of 135 μ m-thicks is cut into strip, and the blade width that sheet body is cut out is 66.5mm, welds at the foil of gap Battery cathode sheet 3 is made in negative electrode lug 31.
The preparation of battery anode slice 1: by positive electrode binder dry powder 2.2%wt, positive conductive agent 2.5%wt (wherein, particle Shape positive conductive agent 0.8%wt, fibrous positive conductive agent 1.7%wt), positive active material 95.3%wt and appropriate NMP it is mixed It closes, solid content is made for 71% anode sizing agent, on the intermittent metal aluminum foil for being coated in 12 μ m-thicks, at 120 DEG C -150 DEG C At a temperature of it is dry after, be rolled into the first sheet body of about 187 μ m-thick of thickness, be cut into strip, the width for cutting out sheet body is 65.0mm welds anode ear 13 at the foil of gap, battery anode slice 1 is made.
The assembling of lithium ion battery: assembling mode is with embodiment 1, and this will not be detailed here.
The test of lithium ion battery: realize lithium ion battery gravimetric energy density and volume energy density than 18650 type lithiums Ion battery is respectively increased 12.59%, 11.97%；When with 0.5CA constant-current constant-voltage charging and 0.5CA constant-current discharge system to lithium Ion battery carries out charge and discharge cycles test, the 300th week capacity of lithium ion battery conservation rate >=79.8%.
Comparative example:
The preparation of negative electrode tab: it by suspending agent dry powder 2.0%wt, graphite powder 93.8%wt, cathode conductive agent 2.0%wt, bears Pole binder 2.2%wt is mixed, and is uniformly mixed after adding deionized water, the negative electrode slurry of solid content 49% is made, Gap type is coated on the metal copper foil of 8 μ m-thicks, 100-130 DEG C at a temperature of it is dry after, be rolled into the piece of about 110 μ m-thick of thickness Body, is cut into strip, and blade width 57.5mm welds negative electrode lug at the foil of gap, battery cathode sheet is made.
The preparation of positive plate: by positive electrode binder dry powder 3.0%wt, positive conductive agent 3.0%wt, (wherein, graininess is being just Pole conductive agent 1.0%wt, fibrous positive conductive agent 2.0%wt), positive active material 94.0%wt and appropriate NMP mixing, system At the anode sizing agent of solid content 64%, clearance-type is coated on the metal aluminum foil of 12 μ m-thicks, 120 DEG C -150 DEG C at a temperature of it is dry After dry, it is rolled into the sheet body of about 170 μ m-thick of thickness, is cut into strip, blade width 55.5mm is welded at the foil of gap Battery anode slice is made in anode ear.
The assembling of lithium ion battery: battery positive and negative plate and diaphragm is suitable according to " diaphragm/negative electrode tab/diaphragm/positive plate " Cylindric pole group core, diaphragm width 60.5mm used are wound into after sequence superposition.Core is inserted in nickel plated steel shell, by negative electrode lug It is welded to steel shell bottom, then carries out roller slot by 18650 type lithium ion battery parameters；Anode ear Laser Welding is welded on nut cap confluence At piece, semi-finished product battery core is made.After toasting battery core according to 18650 type lithium-ion electric pool process, electrolyte is injected, according to 18650 Type lithium ion battery parameter is sealed, and electrolyte is made sufficiently to infiltrate positive and negative pole material and diaphragm；It charges the battery after chemical conversion, i.e., It is assembled into 18650 batteries.
The test of battery: supreme when carrying out constant-current constant-voltage charging (cut-off current 0.01CA) with 0.2CA current versus cell Voltage limit, when carrying out being discharged to lower voltage limit to battery with 0.2CA constant current again, discharge capacity of the cell holds not less than nominal Amount；Realize battery weight energy density 129.5WH/KG, volume energy density 329.1WH/L；When with 0.5CA constant-current constant-voltage charging Charge and discharge cycles test, the 300th week battery capacity conservation rate >=80.1% are carried out to battery with 0.5CA constant-current discharge system.
Test result control such as the following table 1:
Table 1
Table 1, which is shown, tests knot in comparative example (18650 type lithium ion battery), embodiment 1, embodiment 2 and embodiment 3 Fruit.As known from Table 1, the lithium ion battery that the embodiment of the present invention 1, embodiment 2, embodiment 3 provide, compared to existing 18650 type For number lithium ion battery, gravimetric energy density and volume energy density are all improved, and the 300th week capacity of lithium ion battery is protected Holdup >=79.8%, gravimetric energy density and volume energy density improve 11%~16% than 18650 type lithium ion batteries.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly It is included in other related technical areas in scope of patent protection of the invention.

Claims (10)

1. battery anode slice, which is characterized in that the width of the battery anode slice is 65mm ± 5mm；The battery anode slice packet Include cathode metal substrate, with the cathode metal substrate be conductively connected anode ear and coated on the cathode metal substrate outside Positive coating, the anode coating include the component of following parts by weight:
Positive active material 86.0%~98.6%；
Positive conductive agent 0.4%~16.0%；
Positive electrode binder 1.0%~6.0%；
The positive conductive agent includes at least one of the agent of graininess positive conductive and fibrous positive conductive agent.
2. battery anode slice as described in claim 1, which is characterized in that the anode coating includes the group of following parts by weight Point: positive active material 95.0%；Positive conductive agent 3.0%；Positive electrode binder 2.0%；Alternatively,
The anode coating includes the component of following parts by weight: positive active material 95.7%；Positive conductive agent 2.5%；Just Pole binder 1.8%；Alternatively,
The anode coating includes the component of following parts by weight: positive active material 95.3%；Positive conductive agent 2.5%；Just Pole binder 2.2%.
3. battery anode slice as claimed in claim 1 or 2, which is characterized in that the positive active material is LiM1O2、 xLi2MnO3·(1-x)LiM1O2, spinel structure material, at least one of the compound-material for having polyanionic structure, institute Stating spinel structure material is LiMn2O4Or LiMn1.5Ni0.5O4, the compound-material for having polyanionic structure is LiM2PO4Either phosphoric acid vanadium lithium or fluorinated phosphate vanadium lithium or Li2M3SiO4, wherein M1For at least one in Co, Ni, Mn, Al Person, M2For at least one of Fe, Mn, M3For at least one of Fe, Co, Mn, 0 < x < 1；And/or
The positive conductive agent includes the agent of graininess positive conductive and fibrous positive conductive agent, the graininess positive conductive agent Parts by weight shared in the positive coating are respectively 0.2%~8.0% and 0.2% with the fibrous positive conductive agent ~8.0%, the graininess positive conductive agent is electrically conductive graphite or conductive carbon black, and the threadiness positive conductive agent is received for carbon The combination of mitron or carbon fiber or carbon nanotube and graphene；And/or
The positive electrode binder is Kynoar or polyvinyl alcohol；And/or
The cathode metal substrate with a thickness of 12 μm ± 2 μm, the battery anode slice with a thickness of 190 μm ± 5 μm；And/or
The cathode metal substrate is aluminium foil；And/or
The anode coating includes the positive top coat layer and two that two intervals are coated on the top surface of the cathode metal substrate A interval is coated on the positive bottom coat of the bottom surface of the cathode metal substrate, and two positive top coat layers it Between gap and two positive bottom coats between gap in the setting of upper and lower face position, the anode ear is welded in two In the gap of a positive top coat layer.
4. the manufacturing method of battery anode slice as described in any one of claims 1 to 3, which comprises the steps of:
Anode sizing agent preparation step, by the positive active material, the positive conductive agent, the positive electrode binder by it is described just Weight part ratio in the coating of pole is put into n-methlpyrrolidone solvent and mixes, and it is 40%~75% that solid content, which is made, Anode sizing agent；
The anode sizing agent is coated on the cathode metal substrate by anode sizing agent coating step, and it is intermediate that anode coating is made Product；
The anode coating intermediate products are placed in 120 DEG C~150 DEG C of environment and carry out by anode sizing agent dry solidification step The anode sizing agent dry solidification is the positive coating, anode solidification intermediate products is made by dry solidification；
Positive plate procedure of processing successively carries out roll-in to the anode solidification intermediate products, cuts and process, be made positive plate half at Product；
Anode ear welding step welds anode ear on the positive plate semi-finished product, the battery anode slice is made.
5. the manufacturing method of battery anode slice as claimed in claim 4, which is characterized in that the anode sizing agent coating step Embodiment are as follows: be respectively separated the coating anode sizing agent in the top and bottom of the cathode metal substrate, with it is described just The top surface of pole metal substrate forms two spaced positive top coat layers, is formed in the bottom surface of the cathode metal substrate Two spaced positive bottom coats, and gap and two anodes between two positive top coat layers Gap between the coat of bottom is arranged in upper and lower face position；In the anode ear welding step, the anode ear is welded in institute It states in the gap of two positive top coat layers of positive plate semi-finished product；And/or
In the anode sizing agent preparation step, the solid content of the anode sizing agent is 67% or 70% or 71%；And/or
The embodiment of the positive plate procedure of processing are as follows: it is 190 μm of ± 5 μ m-thicks that the anode, which is solidified intermediate products roll-in, First sheet body is cut to the strip sheet body of 65mm ± 5mm wide by the first sheet body, and the positive plate semi-finished product are made.
6. lithium ion battery, which is characterized in that including battery case, battery cathode sheet, the first diaphragm, the second diaphragm, electrolyte With battery anode slice as described in any one of claims 1 to 3, the battery anode slice, the battery cathode sheet, described first Diaphragm, second diaphragm and the electrolyte are all set in the battery case, and the battery anode slice, the battery are negative Pole piece, first diaphragm, second diaphragm are all dipped in the electrolyte, and the battery cathode sheet is being located at the battery just Between pole piece and the battery case, first diaphragm is set between the battery anode slice and the battery cathode sheet, institute It states the second diaphragm to be set between the battery case and the battery cathode sheet, the battery cathode sheet includes negative metal substrate With the cathode coating being coated on outside the negative metal substrate, the cathode coating includes the component of following parts by weight:
Negative electrode active material 86.0%~97.0%；
Cathode conductive agent 0.2%~6.0%；
Suspending agent 1.2%~4.0%；
Negative electrode binder 1.4%~3.4%.
7. lithium ion battery as claimed in claim 6, which is characterized in that the cathode coating includes the group of following parts by weight Point: negative electrode active material 94.5%, cathode conductive agent 2.0%, suspending agent 1.5%, negative electrode binder 2.0%；Alternatively,
The cathode coating includes the component of following parts by weight: negative electrode active material 94.6%, cathode conductive agent 2.1%, is hanged Floating agent 1.4%, negative electrode binder 1.9%；Alternatively,
The cathode coating includes the component of following parts by weight: negative electrode active material 94.2%, cathode conductive agent 2.2%, is hanged Floating agent 1.6%, negative electrode binder 2.0%.
8. lithium ion battery as claimed in claim 7, which is characterized in that the negative electrode active material is graphite powder, silicon substrate is multiple At least one of condensation material, nitride, titanium type oxide, metal oxide, alloy material；And/or
The cathode conductive agent is conductive carbon black or electrically conductive graphite or carbon nanotube；And/or
The negative electrode binder is sodium carboxymethylcellulose or butadiene-styrene rubber or polyacrylic acid or sodium alginate；And/or
The suspending agent is sodium carboxymethylcellulose；And/or
The width of the battery cathode sheet is 66.5mm ± 5mm and is greater than the width of the battery anode slice, first diaphragm Width and the width of second diaphragm be both greater than the width of the battery cathode sheet and all for 68.5mm ± 5mm；And/or
The negative metal substrate with a thickness of 8 μm ± 2 μm, the battery cathode sheet with a thickness of 130 μm ± 5 μm；And/or
The negative metal substrate is copper foil；And/or
The battery case is cylindrical, and the outer diameter of the battery case is 18.25mm ± 0.35mm, the height of the battery case Degree is 73mm ± 5mm；And/or
First diaphragm and second diaphragm are all polypropylene screen or polyethylene film or polypropylene screen, polyethylene film, poly- third The sandwich diaphragm of alkene film.
9. including the following steps: to prepare institute respectively such as the manufacturing method of the described in any item lithium ion batteries of claim 6 to 8 State battery case, the battery anode slice, the battery cathode sheet, first diaphragm, second diaphragm and the electrolysis Liquid, assemble the battery case, the battery anode slice, the battery cathode sheet, first diaphragm, second diaphragm and The electrolyte, which is characterized in that the battery anode slice uses the manufacture of battery anode slice as described in claim 4 or 5 Method preparation；
The battery cathode sheet is prepared using following steps:
Negative electrode slurry preparation step, by the negative electrode active material, cathode conductive agent, the negative electrode binder, described outstanding Floating agent is put into deionized water by the weight part ratio in cathode coating to be uniformly mixed, and it is 45%~55% that solid content, which is made, Negative electrode slurry；
The negative electrode slurry is coated on the negative metal substrate, by the negative electrode slurry by negative electrode slurry coating step Dry solidification is the cathode coating, and cathode is made and coats intermediate products；
Cathode coating intermediate products are placed in 100 DEG C~130 DEG C of environment and carry out by negative electrode slurry dry solidification step Dry solidification is made cathode and solidifies intermediate products；
Negative electrode tab procedure of processing successively carries out roll-in to cathode solidification intermediate products, cuts and process, be made negative electrode tab half at Product；
Negative pole lug welding step welds negative electrode lug on the negative electrode tab semi-finished product, the battery cathode sheet is made.
10. the manufacturing method of lithium ion battery as claimed in claim 9, which is characterized in that the battery case, the battery Positive plate, the battery cathode sheet, first diaphragm, second diaphragm and the electrolyte assembling mode are as follows: by institute Battery anode slice, the battery cathode sheet, first diaphragm and second diaphragm are stated according to the second diaphragm, battery cathode Piece, the first diaphragm, battery anode slice laminated structure after be wound into cylindric pole group core, the cylindric pole group core is filled Assigned in the battery case, semi-finished product battery core is made, the semi-finished product battery core is toasted 24 hours；In the semi-finished product battery core Then interior injection electrolyte seals the semi-finished product battery core, semi-finished product battery is made；By the semi-finished product battery 30 DEG C~45 DEG C of constant temperature under infiltration activation 40 hours is carried out in a manner of just putting infiltration after being first inverted infiltration, then to described The charging chemical conversion of semi-finished product battery, is made the lithium ion battery.
CN201811072008.3A 2018-09-14 2018-09-14 Battery anode slice and its manufacturing method and lithium ion battery and its manufacturing method Pending CN109449432A (en)

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