CN105140570B - A kind of lithium-ion-power cell group and its manufacture method - Google Patents
A kind of lithium-ion-power cell group and its manufacture method Download PDFInfo
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- CN105140570B CN105140570B CN201510477537.1A CN201510477537A CN105140570B CN 105140570 B CN105140570 B CN 105140570B CN 201510477537 A CN201510477537 A CN 201510477537A CN 105140570 B CN105140570 B CN 105140570B
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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
- H01M10/058—Construction or 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention relates to electric automobile power battery field, discloses a kind of lithium-ion-power cell group and its manufacture method.The shape of each single battery is cylinder in the lithium-ion-power cell group of the present invention, is connected between each single battery by metallic conductor, and the distance between bottom surface center of circle of any three adjacent single batteries is equal.The method of the present invention includes：Monomer lithium-ion-power cell is combined with metallic conductor by welding, and make it that the distance between the bottom surface center of circle of any three adjacent single batteries is equal, the shape of monomer lithium-ion-power cell is cylinder.The lithium-ion-power cell group of the present invention, has significantly higher energy density, has significantly longer course continuation mileage using the electric automobile of the lithium-ion-power cell group.Method of the invention, it is possible to significantly improve the energy efficiency of lithium-ion-power cell group, and it can significantly extend the course continuation mileage of electric automobile.
Description
Technical field
The present invention relates to electric automobile power battery field, and in particular, to a kind of lithium-ion-power cell group and its system
Make method.
Background technology
At present, new-energy automobile industry is on the node of new industry, who can be seized in this wheel industry transformation
Commanding elevation, obtains leading position, who will become the pilotage people of New World economy.Wherein, progressively substitution passes electric automobile
The fuel-engined vehicle of system, and the parts that lithium-ion-power cell is most crucial as electric automobile, are related to ev industry hair
The process of exhibition.The development of electric automobile at present also many is asked there is course continuation mileage is short, of high cost, battery is not long etc.
Topic.Wherein electric automobile course continuation mileage is short is caused by many reasons, and as car body is not done, light-weight design, vehicle body be too heavy, load
Cause very much the big influence course continuation mileage of power consumption greatly, battery and motor matching are unreasonable, less efficient to influence course continuation mileage.But
It is that the energy density of battery is one of them the most key factor.Industry is all exploring new battery material, battery life for this
Production method, battery combination method improve the energy density of lithium-ion-power cell.It is close to influence lithium-ion-power cell energy
The material of degree has positive active material and negative electrode active material.The positive active material of lithium-ion-power cell is close via energy
Relatively low LiMn2O4, LiFePO 4 material are spent, to the higher ternary material of energy density, two-spot material transition.Such as the spy in the U.S.
2 times close to LiFePO4 of the energy density of nickel cobalt lithium aluminate used in Si La companies.Negative electrode active material is relatively low from energy density
Hard carbon develop into graphite, and from graphite to the material mistake of the energy density higher such as silicon carbon alloy, lithium alloy, graphene
Cross.But it is possible to the high material safety of metric density can also be affected.And active material only embodies single battery
Energy density, really influence course continuation mileage on electric automobile is in groups after battery pack energy density, in electricity
In the design of chemical system, since the electrochemical energy metric density of cylinder is higher, the general electro-chemical systems for using cylinder.Lithium
Ion battery group is since its different energy density of assemble method also differ, course continuation mileage also difference.As it is special this
The energy density of single battery reaches more than 220Wh/kg used in drawing company MODEL S electric automobiles, combination power battery group
Energy density only has 144Wh/kg or so.The efficiency of the energy density of battery pack only has 65% (144/220=65%).
In order to improve the energy density of battery pack, the manufacture method of corresponding battery pack is all being sought by numerous research institutions.
Method disclosed in the application for a patent for invention that number of patent application is 201210166775.7 is directed to reducing the company between battery cell
Fitting, that application discloses a kind of lithium battery cap, battery core, lithium battery and battery core assemble method, including cover board and at least one
Electrode draws unit, and the cover board has upper and lower surface, and the electrode is drawn unit and matched somebody with somebody including one-to-one first
Hole, insulating seal and rivet are closed, first matching hole runs through the upper and lower surface, the insulating seal up and down
With upper and lower perforative first through hole, first matching hole entangles the insulating seal, and the first through hole is entangled described
Rivet, the rivet, insulating seal and cover board rivet clasp one, the insulating seal by the cover board and rivet insulation every
Open, and the rivet have be used for power pole directly through upper and lower perforative second through hole, electrode can be integrally directly from pole
Piece is connected to protection circuit plate, without centre part.But this method for common cylinder body lithium-ion-power cell and
Speech, the energy density raising of battery pack are limited.
Therefore, a kind of lithium ion for the energy density and energy efficiency that can significantly improve lithium-ion-power cell group is researched and developed
The manufacture method of power battery pack, has important practical significance.
The content of the invention
The purpose of the invention is to overcome the energy density of monomer lithium-ion-power cell in the prior art higher and group
It is combined into lithium-ion-power cell group and applies on electric automobile that lithium-ion-power cell group energy density is relatively low, electric automobile continuation of the journey
The defects of mileage is shorter, there is provided a kind of lithium-ion-power cell group and its manufacture method.The lithium-ion-power cell group of the present invention,
With significantly higher energy density and energy efficiency, have using the electric automobile of the lithium-ion-power cell group significantly longer
Course continuation mileage.The manufacture method of the lithium-ion-power cell group of the present invention, can significantly improve lithium-ion-power cell group
Energy density, energy efficiency is high, and can significantly extend the course continuation mileage of electric automobile.
The present inventor has been surprisingly found that under study for action, and shape is carried out for the monomer lithium-ion-power cell of cylinder
Cause that the distance between the bottom surface center of circle of any three adjacent single batteries is equal during combination, appoint in thus obtained battery pack
The distance between the bottom surface center of circle of three adjacent single batteries of meaning equal lithium-ion-power cell group, has significantly higher
Energy density and energy efficiency, have significantly longer course continuation mileage using the electric automobile of the lithium-ion-power cell group.
Therefore, to achieve these goals, it is described in a first aspect, the present invention provides a kind of lithium-ion-power cell group
The shape of each single battery is cylinder in lithium-ion-power cell group, is connected between each single battery by metallic conductor,
And the distance between bottom surface center of circle of any three adjacent single batteries is equal.
Second aspect, the present invention provides a kind of manufacture method of lithium-ion-power cell group, the described method includes：Pass through
Monomer lithium-ion-power cell is combined by the mode of welding with metallic conductor, and causes any three adjacent single batteries
The distance between the bottom surface center of circle it is equal, wherein, the shape of the monomer lithium-ion-power cell is cylinder.
The third aspect, the present invention provides the lithium-ion-power cell group that the above method obtains.
The present invention lithium-ion-power cell group, there is significantly higher energy density and energy efficiency, using the lithium from
The electric automobile of sub- power battery pack has significantly longer course continuation mileage.The manufacturer of the lithium-ion-power cell group of the present invention
Method, can significantly improve the energy efficiency (energy efficiency is up to 90.9%) of lithium-ion-power cell group, and can significantly extend
The course continuation mileage of electric automobile.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Fig. 1 is the combination schematic diagram of the lithium-ion-power cell group in a kind of preferred embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
In a first aspect, the present invention provides a kind of lithium-ion-power cell group, each list in the lithium-ion-power cell group
The shape of body battery is cylinder, is connected between each single battery by metallic conductor, and any three adjacent monomer electricity
The distance between the bottom surface center of circle in pond is equal.
It will be understood by those skilled in the art that the lithium-ion-power cell group in the present invention refers to by monomer lithium ion
Battery is linked together the different voltages of composition and the lithium-ion-power cell group of capacity by metallic conductor such as conductive connecting piece.
In the lithium-ion-power cell group of the present invention, for the mode of connection, there is no particular limitation, and can regard specifically needs
Will depending on, for example, connection mode can be connected in series either be connected in parallel or connection in series-parallel connection.
The present invention lithium-ion-power cell group in, in order to further improve the energy density of lithium-ion-power cell group and
Energy efficiency, under preferable case, the energy density of single battery is higher than 130Wh/kg, more preferably 135-325Wh/kg,
Cycle life is more than 500 times, more preferably 600-5000 times.
In the lithium-ion-power cell group of the present invention, the present inventor is it has furthermore been found that selection is eligible " any
Capacity difference between two single batteries is 10-100mAh, voltage difference 3-50mV, internal resistance difference for 1-10m Ω " monomer lithium from
Sub- power battery is combined, and can further improve the energy density and energy dose-effect of the lithium-ion-power cell group that combination obtains
Rate, therefore, in order to further improve the energy density of lithium-ion-power cell group and energy efficiency, under preferable case, any two
Capacity difference between a single battery is 10-100mAh, and voltage difference 3-50mV, internal resistance difference is 1-10m Ω.
Second aspect, the present invention provides a kind of manufacture method of lithium-ion-power cell group, this method includes：Pass through weldering
Monomer lithium-ion-power cell is combined by the mode connect with metallic conductor, and causes any three adjacent single batteries
The distance between the bottom surface center of circle is equal, wherein, the shape of the monomer lithium-ion-power cell is cylinder.
In the method for the present invention, do not limited particularly for the embodiment for being combined monomer lithium-ion-power cell
It is fixed, as long as enabling to the distance between the bottom surface center of circle of any three adjacent single batteries equal.Under preferable case,
The embodiment of combination includes：Monomer lithium-ion-power cell is subjected to arrangement fixation so that any three adjacent monomer lithiums
The distance between the bottom surface center of circle of ion battery is equal, sets metal to lead on the monomer lithium-ion-power cell fixed
Body, and welded with the mode of laser or resistance welding, then the battery being welded is loaded in battery case.
In the method for the present invention, when being combined to monomer lithium-ion-power cell, to monomer in the battery pack that is combined into
There is no particular limitation for line number and columns when the quantity of battery, arrangement, can be adjusted according to the actual requirements.
It is not special for the mode of welding when being combined to monomer lithium-ion-power cell in the method for the present invention
Restriction, can according to the actual requirements be adjusted, can such as carry out Series connection welding either in parallel welding or connection in series-parallel welding,
This is known to those skilled in the art.
In the method for the present invention, in order to improve the condition of satisfaction, " capacity difference between any two single battery is 10-
100mAh, voltage difference 3-50mV, the qualification rate for the monomer lithium-ion-power cell that internal resistance difference obtains for the sorting of 1-10m Ω ",
Under preferable case, the energy density of single battery is higher than 130Wh/kg, and more preferably 135-325Wh/kg, cycle life are big
In 500 times, more preferably 600-5000 times.
In the method for the present invention, for the preparation method of monomer lithium-ion-power cell, there is no particular limitation, can be this
The common various methods in field, in order to further improve the condition of satisfaction, " capacity difference between any two single battery is 10-
100mAh, voltage difference 3-50mV, the qualification rate for the monomer lithium-ion-power cell that internal resistance difference obtains for the sorting of 1-10m Ω ",
Under preferable case, the method further includes：Monomer lithium-ion-power cell is prepared by method comprising the following steps：By cathode
Slurry and cathode size carry out ultrasound filtration processing respectively, and the material then handled using ultrasound filtration prepares battery.
In the method for the present invention, anode sizing agent contains positive active material, adhesive and conductive agent, for positive electrode active material
There is no particular limitation for matter, adhesive and conductive agent, can be respectively various positive active materials commonly used in the art, adhesive
And conductive agent.Under preferable case, positive active material at least contains two kinds of elements of manganese and lithium, it is further preferred that positive-active
Material is nickle cobalt lithium manganate, cobalt acid lithium, nickel ion doped, lithium nickel cobalt dioxide, LiFePO4, lithium ferric manganese phosphate, ferric phosphate cobalt lithium and phosphorus
One or more in sour ferrimanganic cobalt lithium, it is further preferred that the D50 of positive active material is 1-20 microns；Adhesive is
One or more in sodium carboxymethylcellulose (CMC), Kynoar (PVDF), butadiene-styrene rubber (SBR) and polypropylene；It is conductive
Agent is the one or more in carbon black, graphite, carbon nanotubes, graphene and metal dust, not special for metal dust
Limit, can be various metal dusts commonly used in the art, this is known to those skilled in the art, and details are not described herein.
In the method for the present invention, cathode size contains negative electrode active material, adhesive and conductive agent, for negative electrode active material
There is no particular limitation for matter, adhesive and conductive agent, can be respectively various negative electrode active materials commonly used in the art, adhesive
And conductive agent.Under preferable case, negative electrode active material is the layer structure or spinelle knot that lithium ion can be embedded in or deviate from
Structure, it is further preferred that negative electrode active material is graphite, lithium titanate, graphene and can be in embedding lithium alloy one or more；It is viscous
Mixture is sodium carboxymethylcellulose (CMC), Kynoar (PVDF), butadiene-styrene rubber (SBR) and one kind or more in polypropylene
Kind；Conductive agent is the one or more in carbon black, graphite, carbon nanotubes, graphene and metal dust, is not had for metal dust
It is special to limit, can be various metal dusts commonly used in the art, this is known to those skilled in the art, no longer superfluous herein
State.
In the method for the present invention, for the solvent that is used in anode sizing agent and cathode size, there is no particular limitation, Ke Yifen
Various solvents that Wei be not commonly used in the art, for example, the solvent used in anode sizing agent can be water, ethanol or N- crassitudes
Ketone (NMP), the solvent used in cathode size can be water, ethanol or 1-methyl-2-pyrrolidinone (NMP).
In the method for the present invention, for the content of each component in anode sizing agent and cathode size, there is no particular limitation, can
To be respectively various contents commonly used in the art, for example, in terms of anode sizing agent, the content of positive active material can be 82-
96wt%, the content of adhesive can be 0.5-10wt%, and the content of conductive agent can be 0.5-8wt%；In terms of cathode size,
The content of negative electrode active material can be 82-96wt%, and the content of adhesive can be 0.5-10wt%, and the content of conductive agent can
Think 0.5-8wt%.
In the method for the present invention, it will be understood by those skilled in the art that to anode sizing agent and cathode size respectively into
Before the processing of row ultrasound filtration, anode sizing agent and cathode size can be uniformly mixed.For by anode sizing agent and cathode size
There is no particular limitation for uniformly mixed mode, as long as can be uniformly mixed anode sizing agent and cathode size.In order to carry
The effect of high follow-up ultrasound filtration processing, under preferable case, the incorporation time of anode sizing agent and cathode size is small for 0.5-2
When.
In the method for the present invention, in order to further improve the condition of satisfaction, " capacity difference between any two single battery is 10-
100mAh, voltage difference 3-50mV, the qualification rate for the monomer lithium-ion-power cell that internal resistance difference obtains for the sorting of 1-10m Ω ",
Under preferable case, the implementation number of ultrasound filtration processing is 3-5.It is further preferred that the implementation condition bag of ultrasound filtration processing
Include：Supersonic frequency is 25-50kHz；Ultrasonic time is 3-60min, is still more preferably 15-35min；Sieve used in filtering
Mesh is 50-500 mesh, is still more preferably 100-230 mesh.It will be understood by those skilled in the art that during aforementioned ultrasonic
Between to carry out once the ultrasonic time, moreover, ultrasound filtration processing is preferably first ultrasonically treated and carries out filtration treatment again, and
In this case, 1 ultrasound filtration processing is that 1 time carried out successively is ultrasonically treated and 1 filtration treatment, 2 ultrasound filtrations
Handle 1 supersound process, 1 filtration treatment, 1 supersound process and 1 filtration treatment to carry out successively.
In the method for the present invention, in order to further improve the condition of satisfaction, " capacity difference between any two single battery is 10-
100mAh, voltage difference 3-50mV, the qualification rate for the monomer lithium-ion-power cell that internal resistance difference obtains for the sorting of 1-10m Ω ",
Under preferable case, the process that the material that is handled using ultrasound filtration prepares battery includes：Handled using the ultrasound filtration
Initial cells are made in obtained material, and the initial cells are carried out activation process and chemical conversion treatment successively.
It is not special to the method using the material preparation initial cells by ultrasound filtration processing in the method for the present invention
Limit, can be the various methods commonly used in the art that battery is prepared using slurry.Such as this method includes to handle what is obtained
Material prepares battery according to the process of coating, roll-in, cutting, film-making, winding, fluid injection, sealing.Wherein, for 18650 models
Lithium-ion-power cell, in roll-in, the thickness of anode pole piece can be 0.155-0.165mm, and the thickness of cathode pole piece can be with
For 0.140-0.150mm, in cutting, the width of anode pole piece can be 56-57mm, and the width of cathode pole piece can be 58-
59mm。
, can be with for there is no particular limitation for electrolyte used in fluid injection during battery is prepared in the method for the present invention
For various electrolyte commonly used in the art, such as electrolyte can be organic solvent, include but not limited to methyl ethyl carbonate
(EMC), carbonic acid formicester (DC), ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), ethylene fat etc..
In the method for the present invention, for preparing battery when membrane thicknesses used there is no particular limitation, can be this area
Common thickness, under preferable case, prepares membrane thicknesses used during battery no more than 30 microns.
In the method for the present invention, for preparing battery when battery case used material there is no particular limitation, can be this
The common a variety of materials in field, under preferable case, it is aluminum alloy materials or stainless steel to prepare battery case used during battery
Material.
In the method for the present invention, under preferable case, the condition of activation process includes：Activation temperature is 25-50 DEG C, soak time
For 20-30 it is small when.
In the method for the present invention, in order to further improve the condition of satisfaction, " capacity difference between any two single battery is 10-
100mAh, voltage difference 3-50mV, the qualification rate for the monomer lithium-ion-power cell that internal resistance difference obtains for the sorting of 1-10m Ω ",
Under preferable case, the mode of chemical conversion treatment is melted into for constant current, and the electric current being melted into is more than 0.6C5A, it is further preferred that chemical conversion
Electric current be 0.6-15C5A, is still more preferably 0.8-6C5A, the blanking voltage of chemical conversion is 3.8-4.0V.People in the art
Member is it should be understood that 1C5In A, C5Refer to the numerical value of 5h rate discharge capacities, 1C5Refer to the C of 1 multiplying power5Electric discharge electric current.
In the method for the present invention, it will be understood by those skilled in the art that obtained by foregoing specific preparation method
Monomer lithium-ion-power cell, energy density are higher than 150Wh/kg, and the cycle life of battery is more than 500 times, and 23 DEG C, 1C5Under A
The capacity retention ratio of 500th circulation remains above 85%, and can be tested by acupuncture, securely and reliably.
The third aspect, the present invention provides the lithium-ion-power cell group that the above method manufactures.
The energy efficiency of the lithium-ion-power cell group of the present invention is up to 90.9%, can significantly extend the continuous of electric automobile
Navigate mileage.
Embodiment
Below will by preparation example, contrast preparation example, the present invention will be described in detail for embodiment and comparative example.Such as without spy
Do not mentionlet alone bright, each material used is commercially available, and the various methods of use are the conventional method of this area.
The energy density of battery refers to the energy of Unit Weight, wherein energy=capacity * voltages.
23℃、1C5The method of capacity retention ratio determination experiment after being circulated 500 times under A is：QC/T743-2006.
Acupuncture experiment assay method be：QC/T743-2006.
The sorting of the indexs such as self discharge, voltage, internal resistance is carried out using battery voltage internal resistance tester, wherein, cell voltage
Internal resistance test device is purchased from new Weir limited energy company of Shenzhen.
Battery capacity sorting is carried out using battery testing system, wherein, battery testing system is purchased from the new Weir energy in Shenzhen
Source Co., Ltd, model BTS-5V6A.
Preparation example 1
This preparation example is used for the manufacture method for illustrating monomer lithium-ion-power cell.
(1) by 5000g nickle cobalt lithium manganates, 150g carbon blacks, 150g Kynoar and 4000g 1-methyl-2-pyrrolidinones into
Row liquid phase mixes, and stirring 1 forms uniform anode sizing agent when small, and 4 ultrasound filtration processing are then carried out to anode sizing agent, its
In, each ultrasound filtration is first once ultrasonically treated when handling carries out a filtration treatment again, and be ultrasonically treated every time
Supersonic frequency is 40kHz, and ultrasonic time is 30min, and when filtering will cross 150 purposes by the anode sizing agent being ultrasonically treated
Sieve.
(2) by 3000g graphite, 30g conductive blacks, 30g sodium carboxymethylcelluloses and 120g butadiene-styrene rubber, 3300g water into
Row liquid phase mixes, and stirring 1 forms uniform cathode size when small, and 4 ultrasound filtration processing are then carried out to cathode size, its
In, each ultrasound filtration is first once ultrasonically treated when handling carries out a filtration treatment again, and be ultrasonically treated every time
Supersonic frequency is 40kHz, and ultrasonic time is 30min, and when filtering will cross 150 purposes by the cathode size being ultrasonically treated
Sieve.
(3) anode sizing agent and aluminium foil for being obtained step (1) by painting process are bonded together, and step (2) is obtained
Cathode size and copper foil be bonded together, the coiled pole piece of cathode and the coiled pole piece of anode is respectively prepared, it is then that cathode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of anode is passed through roll squeezer roll-in to 0.145mm
Degree, then is cut anode pole piece to the width of 56mm with cutting machine, and cathode pole piece is cut to the width of 58mm, pole in welding
Ear, is wound into cylindrical cell, puts into aluminum alloy battery shell, injects electrolyte (EC/DMC=1 into the battery of assembling:1
(volume ratio)), battery is sealed in the environment of humidity 1%, the lithium-ion-power cell of 18650 models is made.
(4) by the battery for sealing mouth activated at 35 DEG C 25 it is small when, then carry out constant current chemical conversion, the electric current of chemical conversion is
1C5A, the blanking voltage of chemical conversion is 3.9V.
Preparation example 2
This preparation example is used for the manufacture method for illustrating monomer lithium-ion-power cell.
(1) 5000g nickel ion dopeds, 150g graphite, 150g carboxymethyl celluloses and 4000g ethanol are subjected to liquid phase mixing,
Stir 1.5 it is small when form uniform anode sizing agent, the processing of 3 ultrasound filtrations is then carried out to anode sizing agent, wherein, ultrasound every time
First once it is ultrasonically treated during filtration treatment and carries out a filtration treatment again, and the supersonic frequency being ultrasonically treated every time is
50kHz, ultrasonic time are 15min, and when filtering will cross the sieve of 120 mesh by the anode sizing agent being ultrasonically treated.
(2) 3000g graphite, 30g carbon nanotubes, 150g butadiene-styrene rubber and 3300g ethanol are subjected to liquid phase mixing, stirring
1.5 form uniform cathode size when small, 3 ultrasound filtration processing are then carried out to cathode size, wherein, each ultrasound filtration
First once it is ultrasonically treated during processing and carries out a filtration treatment again, and the supersonic frequency being ultrasonically treated every time is
50kHz, ultrasonic time are 15min, and when filtering will cross the sieve of 120 mesh by the cathode size being ultrasonically treated.
(3) anode sizing agent and aluminium foil for being obtained step (1) by painting process are bonded together, and step (2) is obtained
Cathode size and copper foil be bonded together, the coiled pole piece of cathode and the coiled pole piece of anode is respectively prepared, it is then that cathode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of anode is passed through roll squeezer roll-in to 0.145mm
Degree, then is cut anode pole piece to the width of 56mm with cutting machine, and cathode pole piece is cut to the width of 58mm, pole in welding
Ear, is wound into cylindrical cell, puts into aluminum alloy battery shell, injects electrolyte (EC/DMC/PC=1 into the battery of assembling:
1:1 (volume ratio)), battery is sealed in the environment of humidity 1%, the lithium-ion-power cell of 18650 models is made.
(4) by the battery for sealing mouth activated at 40 DEG C 20 it is small when, then carry out constant current chemical conversion, the electric current of chemical conversion is
0.8C5A, the blanking voltage of chemical conversion is 3.8V.
Preparation example 3
This preparation example is used for the manufacture method for illustrating monomer lithium-ion-power cell.
(1) by 2500g LiMn2O4s, 2500g nickle cobalt lithium manganates, 150g carbon blacks, 150g Kynoar and 4000g N- first
Base pyrrolidones carries out liquid phase mixing, and stirring 1 forms uniform anode sizing agent when small, then carries out 5 ultrasounds to anode sizing agent
Filtration treatment, wherein, each ultrasound filtration is first once ultrasonically treated when handling carries out a filtration treatment again, and every time
The supersonic frequency of supersound process is 25kHz, and ultrasonic time is 35min, will be by the anode sizing agent that is ultrasonically treated during filtering
Cross the sieve of 150 mesh.
(2) 3000g graphite, 30g carbon blacks, 150g Kynoar and 3300g 1-methyl-2-pyrrolidinones progress liquid phase are mixed
To close, stirring 1 forms uniform cathode size when small, and 5 ultrasound filtration processing are then carried out to cathode size, wherein, it is super every time
First once it is ultrasonically treated during sound filtration treatment and carries out a filtration treatment again, and the supersonic frequency being ultrasonically treated every time is equal
For 25kHz, ultrasonic time is 35min, and when filtering will cross the sieve of 150 mesh by the cathode size being ultrasonically treated.
(3) anode sizing agent and aluminium foil for being obtained step (1) by painting process are bonded together, and step (2) is obtained
Cathode size and copper foil be bonded together, the coiled pole piece of cathode and the coiled pole piece of anode is respectively prepared, it is then that cathode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of anode is passed through roll squeezer roll-in to 0.145mm
Degree, then is cut anode pole piece to the width of 56mm with cutting machine, and cathode pole piece is cut to the width of 58mm, pole in welding
Ear, is wound into cylindrical cell, puts into aluminum alloy battery shell, injects electrolyte (EC/DMC=1 into the battery of assembling:1
(volume ratio)), battery is sealed in the environment of humidity 1%, the lithium-ion-power cell of 18650 models is made.
(4) by the battery for sealing mouth activated at 30 DEG C 30 it is small when, then carry out constant current chemical conversion, the initial current of chemical conversion is
6C5A, the blanking voltage of chemical conversion is 4.0V.
Preparation example 4
According to the method for preparation example 1, the difference is that, 2 ultrasound filtrations processing, and ultrasound are carried out in step (1) and (2)
The condition of processing is：Supersonic frequency is 20kHZ, ultrasonic time 60min.
Preparation example 5
According to the method for preparation example 1, the difference is that, constant current chemical conversion, and the electricity being melted into are carried out in step (4) during chemical conversion treatment
Flow for 0.6C5A。
Preparation example 6
According to the method for preparation example 1, the difference is that, constant current chemical conversion, and the electricity being melted into are carried out in step (4) during chemical conversion treatment
Flow for 15C5A。
Preparation example 7
According to the method for preparation example 1, the difference is that, constant current chemical conversion is carried out in step (4) during chemical conversion treatment, and what is be melted into cuts
Only voltage is 4.2V.
Contrast preparation example 1
According to the method for preparation example 1, the difference is that, uniform anode sizing agent and anode are formed in step (1) and (2) respectively
Handled after slurry without ultrasound filtration, but directly carry out step (3).
Contrast preparation example 2
According to the method for preparation example 1, the difference is that, uniform anode sizing agent and anode are formed in step (1) and (2) respectively
Handled after slurry without ultrasound filtration, but directly carry out step (3).And in step (4), when chemical conversion treatment, carries out constant current
Chemical conversion, and the initial current being melted into is 0.3C5A, the blanking voltage of chemical conversion is 4.0V.
Test example 1
Energy density is measured to the obtained battery of preparation example 1-7 and contrast preparation example 1-2 respectively, carries out acupuncture experiment and 23
℃、1C5Capacity retention ratio determination experiment after being circulated 500 times under A, the results are shown in Table 1.
Table 1
From the data of preparation example in table 1 and contrast preparation example relatively, anode sizing agent and anode are starched before preparing battery
Material carries out ultrasound filtration processing respectively, still has into the lithium-ion-power cell under state, manufactured in high current obvious
Higher energy density, capacity and cycle performance, moreover, not influencing the feelings of the energy density of battery, capacity and cycle performance
Under condition, the manufacture cost of battery can be substantially reduced.Wherein, the battery manufactured according to the method for preparation example, energy density
Higher than 150Wh/kg, cycle life is more than 500 times, and 23 DEG C, 1C5The capacity retention ratio of the 500th circulation remains above under A
85%, and can be tested by acupuncture, securely and reliably.
Embodiment 1-9
Embodiment 1-9 is respectively used to the manufacture method of the lithium-ion-power cell group of the explanation present invention.
By preparation example 1-7 and contrast preparation example 1-2, (preparation example 1-7 and contrast preparation example 1-2 correspond respectively to implement respectively
Example 1-9) obtained monomer lithium-ion-power cell carries out the sorting of the indexs such as self discharge, capacity, voltage, internal resistance in groups.Wherein,
The single battery that selection meets the following conditions is combined：Capacity difference is 10- between groups of any two single battery
100mAh, voltage difference 3-50mV, internal resistance difference is 1-10m Ω.The monomer lithium-ion-power cell for meeting aforementioned condition is considered as
Qualified battery is sorted, wherein, the qualification rate of the monomer lithium-ion-power cell that embodiment 1-9 is sorted is respectively 90%,
92%th, 91%, 86%, 88%, 81%, 83%, 44% and 41%.
(single battery quantity is 150, and battery pack is connection in series-parallel form 10S15P) as shown in Figure 1, to sorting groups of electricity
Pond carries out connection in series-parallel welding and is combined into lithium-ion-power cell group so that any three adjacent lists in lithium-ion-power cell group
The distance between the bottom surface center of circle of body battery is equal.Wherein, the process of combination includes：By qualified single battery according to Fig. 1 institutes
The mode of showing carries out arrangement fixation so that the distance between any three adjacent bottom surface centers of circle of monomer lithium-ion-power cell phase
Deng, conductive connecting piece is set on the single battery fixed, and welded with the mode of laser welding, then it will be welded
Battery load battery case in.
Embodiment 10
According to the method for embodiment 1, the difference is that, the single battery that selection meets the following conditions is combined：It is groups of
Capacity difference is 110-130mAh between any two single battery, and voltage difference 51-55mV, internal resistance difference is 12-15m Ω.Will symbol
The monomer lithium-ion-power cell for closing aforementioned condition is considered as the qualified battery of sorting, then embodiment 10 sort obtained monomer lithium from
The qualification rate of sub- power battery is 82%.
Comparative example 1
According to the method for embodiment 1, unlike, any three adjacent monomers in lithium-ion-power cell group during combination
The distance between bottom surface center of circle of battery is simultaneously unequal.
Test example 2
In embodiment 1-10 and comparative example 1, respectively measure aforementioned combinatorial into lithium-ion-power cell group energy it is close
Degree, the results are shown in Table 2.
Table 2
By the results contrast of embodiment and comparative example in table 2 understand, by monomer lithium ion power battery combination for lithium from
During sub- power battery pack, control the distance between bottom surface center of circle of any three adjacent single batteries in battery pack equal, by
This obtained lithium-ion-power cell group, has significantly higher energy density and energy efficiency, can significantly extend electronic vapour
The course continuation mileage of car.
In addition, the results contrast of embodiment 1 and embodiment 4 is understood, 3-5 ultrasound filtration processing is carried out, and at ultrasound
In reason, when supersonic frequency is 25-50kHz, and ultrasonic time is 15-35min, in the lithium-ion-power cell for not influencing to be combined into
In the case of the energy efficiency of group, the qualification rate for the lithium-ion-power cell that sorting obtains can be further improved (with any two
Capacity difference is 10-100mAh between a single battery, and voltage difference 3-50mV, internal resistance difference is that 1-10m Ω are standard).
The results contrast of embodiment 1 and embodiment 5-7 are understood, the battery for sealing mouth is subjected to activation process and constant current
Into, and the electric current being melted into is 0.8-6C5A, when the blanking voltage of chemical conversion is 3.8-4.0V, is moved in the lithium ion for not influencing to be combined into
In the case of the energy efficiency of power battery pack, can further improve sorting obtain lithium-ion-power cell qualification rate (with
Capacity difference is 10-100mAh between any two single battery, and voltage difference 3-50mV, internal resistance difference is that 1-10m Ω are standard).
The results contrast of embodiment 1 and embodiment 8-9 are understood, distinguish anode sizing agent and cathode size before preparing battery
Ultrasound filtration processing is carried out, under high current under chemical conversion state, in the energy for the lithium-ion-power cell group for not influencing to be combined into
In the case of efficiency, the qualification rate for the lithium-ion-power cell that sorting obtains can be further improved (with any two monomer electricity
Capacity difference is 10-100mAh between pond, and voltage difference 3-50mV, internal resistance difference is that 1-10m Ω are standard).
The results contrast of embodiment 1 and embodiment 10 is understood, during combination, the capacity difference between any two single battery
For 10-100mAh, voltage difference 3-50mV, when internal resistance difference is 1-10m Ω, the lithium ion power electricity of combination can be further improved
The qualification rate for the lithium-ion-power cell that the energy efficiency of pond group and sorting obtain.
The preferred embodiment of the present invention described in detail above, still, during present invention is not limited to the embodiments described above
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (8)
- A kind of 1. manufacture method of lithium-ion-power cell group, it is characterised in that the described method includes：Use by welding Monomer lithium-ion-power cell is combined by metallic conductor, and cause any three adjacent single batteries the bottom surface center of circle it Between distance it is equal, wherein, the shape of the monomer lithium-ion-power cell is cylinder, between any two single battery Capacity difference be 10-100mAh, voltage difference 3-50mV, internal resistance difference is 1-10m Ω,The method further includes：Monomer lithium-ion-power cell is prepared by method comprising the following steps：By anode sizing agent and Cathode size carries out ultrasound filtration processing respectively, and the material then handled using ultrasound filtration prepares battery, the utilization The process that the material that ultrasound filtration is handled prepares battery includes：The material handled using the ultrasound filtration is made just Beginning battery, and the initial cells are subjected to activation process and chemical conversion treatment successively, the mode of the chemical conversion treatment is constant current Into, and the electric current being melted into is 0.8-6C5A, the blanking voltage of chemical conversion is 3.8-4.0V.
- 2. according to the method described in claim 1, wherein, the embodiment of the combination includes：By monomer lithium ion power electricity Pond carries out arrangement fixation so that and the distance between any three adjacent bottom surface centers of circle of monomer lithium-ion-power cell are equal, Metallic conductor is set on the monomer lithium-ion-power cell fixed, and is welded with the mode of laser or resistance welding, Then the battery being welded is loaded in battery case.
- 3. according to the method described in claim 1, wherein, the implementation number of the ultrasound filtration processing is 3-5.
- 4. the method according to claim 1 or 3, wherein, the implementation condition of the ultrasound filtration processing includes：Supersonic frequency For 25-50kHz；Ultrasonic time is 3-60min；The mesh of sieve used in filtering is 50-500 mesh.
- 5. according to the method described in claim 4, wherein, ultrasonic time 15-35min.
- 6. according to the method described in claim 4, wherein, the mesh of sieve used in filtering is 100-230 mesh.
- 7. according to the method described in claim 1, wherein, the anode sizing agent contains positive active material, adhesive and conduction Agent, the positive active material for nickle cobalt lithium manganate, cobalt acid lithium, nickel ion doped, lithium nickel cobalt dioxide, LiFePO4, lithium ferric manganese phosphate, One or more in ferric phosphate cobalt lithium and phosphoric acid ferrimanganic cobalt lithium；The cathode size contain negative electrode active material, adhesive and Conductive agent, the negative electrode active material is graphite, lithium titanate, graphene and can be in embedding lithium alloy one or more.
- 8. the lithium-ion-power cell group obtained according to any one the method in claim 1-7.
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| CN102544515A (en) * | 2012-02-21 | 2012-07-04 | 杭州力奥科技有限公司 | Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece |
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| CN101212044A (en) * | 2006-12-29 | 2008-07-02 | 比亚迪股份有限公司 | Li-ion secondary battery anode preparation method |
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| CN102208573A (en) * | 2011-04-22 | 2011-10-05 | 东风汽车公司 | Power battery pack arrangement, connection and assembly structure |
| CN102544515A (en) * | 2012-02-21 | 2012-07-04 | 杭州力奥科技有限公司 | Lithium iron phosphate power battery water-based cathode slurry and method for preparing cathode pole piece |
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