CN105149241B - A kind of method for separating of lithium-ion-power cell and the lithium-ion-power cell group prepared using the battery that sorting obtains - Google Patents
A kind of method for separating of lithium-ion-power cell and the lithium-ion-power cell group prepared using the battery that sorting obtains Download PDFInfo
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Abstract
The present invention relates to electric automobile power battery field, the lithium-ion-power cell group for disclosing a kind of method for separating of lithium-ion-power cell and being prepared using the battery that sorting obtains.The method for separating of the lithium-ion-power cell of the present invention includes：Alternative monomer lithium-ion-power cell is fully charged, it stands, then the monomer lithium-ion-power cell is subjected to constant-current discharge with 1.5 times of electric current for being not less than predetermined peak value operating current, the monomer lithium-ion-power cell that battery surface temperature is selected to be not higher than 50 DEG C.The method for separating of the present invention can realize the efficient separation to lithium-ion-power cell, the lithium-ion-power cell sorted using the method for the present invention prepares lithium-ion-power cell group, which has significantly higher cycle life and manufacture cost is relatively low.
Description
Technical field
The present invention relates to electric automobile power battery fields, and in particular, to a kind of sorting side of lithium-ion-power cell
Method and the lithium-ion-power cell group prepared using the battery that sorting obtains.
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.But new energy car battery price is held high at present
Expensive, service life is shorter to be compared with orthodox car without value advantage.Battery used has phosphorus at present on new-energy automobile
Sour lithium iron battery, lithium manganate battery and nickle cobalt lithium manganate battery.For Chinese market, LiFePO 4 material is mainstream technology
Route, is mainly characterized by that cycle life is long, and monomer ferric phosphate lithium cell cycle life can reach 2000 times or more, but
To have been found that very short time battery just will appear quality problems in actual use, it is difficult to ensure electric vehicle 5 years or
100000 kilometers of the related operation popularization promised to undertake, affect electric vehicle.Based on this situation, the enterprise of lithium-ion-power cell
All the cycle life of solution raising lithium-ion-power cell in actual use is actively being found with research and development institution.Often
Method is mostly that the electrochemical system of the structure and battery by improving material improves the cycle life of single battery, service life
It can reach 3000 times or more, but find in actual use, the battery run on electric vehicle uses
Service life is well below expection, so that the cost of power battery increases, influences the development of entire ev industry.Due to
Power battery is mostly to be applied in combination, and is only started with from the performance improvement of single battery, is also not enough to solve lithium-ion-power cell
The cost and life problems of group.Thus related research institutes and enterprise propose solution party from the angle of compounding separation method
Case, such as, it is proposed that a kind of detection method for separating for being related to self-discharge performance of lithium iron phosphate battery, this method are：1st, it is charged to
＜ 70%SOC/；2nd, storage a period of time, this time are referred to as stabilization time；3rd, the open-circuit voltage of battery, this step institute are tested
The voltage measured is referred to as V1；4th, storage a period of time, this time are referred to as the self discharge time；5th, the open circuit electricity of test battery
Pressure, the measured voltage of this step are referred to as V2；6th, the falling quantity of voltages of battery is calculated, falling quantity of voltages is referred to as △ V, △ V=
V1-V2；7th, △ V are determined as defective work more than the battery of standard value, and the battery that △ V are less than or equal to standard value is determined as non-defective unit.
This method does not need to high temperature ageing can sub-elect self-discharge performance of lithium iron phosphate battery in a short time, solve existing point
Choosing method needs to accelerate the velocity of discharge using high temperature ageing to shorten the problem of testing cost caused by detection time is high.But
This method is only slightly to contribute reducing cost, it is difficult to solve what lithium-ion-power cell was faced during automobile use
Lost of life problem.
Invention content
The purpose of the invention is to overcome in the prior art monomer lithium-ion-power cell have extended cycle life and be combined as
Lithium-ion-power cell group is applied the service life is shorter on electric vehicle the defects of, provides a kind of sorting side of lithium-ion-power cell
Method and the lithium-ion-power cell group prepared using the battery that sorting obtains.The lithium ion sorted using the method for the present invention
Power battery prepares lithium-ion-power cell group, which has significantly higher cycle life and be manufactured into
This is relatively low.
In practical operation, lithium-ion-power cell is when being stack battery by combination of monomers often over capacity point
At least one of choosing, voltage sorting, internal resistance sorting etc. step, wherein, the capacity point of traditional monomer lithium-ion-power cell
It is changeless, generally less than 1C to select electric current5A for the monomer lithium-ion-power cell of cylinder, sorts electric current
Even less than 0.8C5A.After being sorted through overcapacity, lithium-ion-power cell can be divided into different capacity gears, then carry out
Combination.However, between the actual life of monomer lithium-ion-power cell and the lithium-ion-power cell group of combination, there are huge
Big difference.The present inventor has been surprisingly found that under study for action, the distinct methods sorted to monomer lithium-ion-power cell
Seriously affect normal operation of the lithium-ion-power cell group being finally combined on electric vehicle, and by by alternative monomer
Lithium-ion-power cell is fully charged, stands, then by the monomer lithium-ion-power cell to be not less than predetermined peak value operating current
1.5 times of electric current carry out constant-current discharge, select battery surface temperature be not higher than 50 DEG C monomer lithium-ion-power cell as
The method for separating of qualified monomer lithium-ion-power cell carries out the sorting of lithium-ion-power cell, and utilizes the qualified monomer of sorting
Lithium ion power battery combination is lithium-ion-power cell group, which has significantly higher cycle life
And manufacture cost is relatively low.
Therefore, to achieve these goals, in a first aspect, the present invention provides a kind of sorting sides of lithium-ion-power cell
Method, the method includes：Alternative monomer lithium-ion-power cell is fully charged, it stands, then by the monomer lithium ion power
Battery carries out constant-current discharge with the electric current for being not less than the 1.5 of predetermined peak value operating current times, and battery surface temperature is selected to be not higher than
50 DEG C of monomer lithium-ion-power cell.
Second aspect, the present invention provides the lithium ions being prepared using the lithium-ion-power cell that the above method obtains
Power battery pack.
The method for separating of the present invention can realize the efficient separation to lithium-ion-power cell, utilize the method point of the present invention
Obtained lithium-ion-power cell is selected to prepare lithium-ion-power cell group, which has significantly higher follow
The ring service life, and it is relatively low to manufacture cost.Wherein, monomer lithium ion power electricity is prepared according to a preferred embodiment of the present invention
Chi Shi, that is, anode sizing agent and negative electrode slurry are subjected to ultrasound filtration processing respectively, the object then handled using ultrasound filtration
Material prepares battery, can effectively improve the qualification rate of monomer lithium-ion-power cell that sorting obtains.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific embodiment
The specific embodiment of the present invention is described in detail below.It is it should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In a first aspect, the present invention provides a kind of method for separating of lithium-ion-power cell, this method includes：It will be alternative
Monomer lithium-ion-power cell is fully charged, stands, and then the monomer lithium-ion-power cell is worked with being not less than predetermined peak value
1.5 times of electric current of electric current carries out constant-current discharge, the monomer lithium-ion-power cell that battery surface temperature is selected to be not higher than 50 DEG C.
It will be understood by those skilled in the art that in the present invention, predetermined peak value operating current is in actual use process
The maximum discharge current of middle lithium-ion-power cell.In sorting, when battery surface temperature is not higher than 50 DEG C, judge that this is alternative
Monomer lithium-ion-power cell it is qualified, when battery surface temperature is higher than 50 DEG C, judge the alternative monomer lithium ion power
Battery is unqualified.
In the method for the present invention, it has furthermore been found that in sorting, monomer lithium ion is moved under study for action by the present inventor
Power battery carries out constant-current discharge with 1.5-5 times of electric current of predetermined peak value operating current, can further improve the lithium being combined into
The cycle life of ion battery group, it is therefore preferred that by the monomer lithium-ion-power cell with predetermined peak value operating current
1.5-5 times of electric current carry out constant-current discharge.
In the method for the present invention, under preferable case, by monomer lithium-ion-power cell it is fully charged after, stand 30 minutes or more,
35-60 minutes further preferably are stood, constant-current discharge then is carried out to the monomer lithium-ion-power cell.
In the method for the present invention, in order to improve the obtained qualification rate of monomer lithium-ion-power cell of sorting, under preferable case,
The energy density of monomer lithium-ion-power cell is higher than 130Wh/kg, further preferably 140-380Wh/kg, and cycle life is big
In 500 times, further preferably 600-5000 times, it is further preferred that shape is cylinder.
In the method for the present invention, the preparation method of monomer lithium-ion-power cell sorted is not limited particularly
It is fixed, can be various methods commonly used in the art.It is excellent in order to improve the qualification rate of monomer lithium-ion-power cell that sorting obtains
In the case of choosing, the method further includes：Monomer lithium-ion-power cell is prepared by method comprising the following steps：Anode is starched
Material and negative electrode slurry carry out ultrasound filtration processing respectively, then prepare battery using the material that ultrasound filtration is handled.
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 is at least containing two kinds of elements of manganese and lithium, it is further preferred that positive-active
Substance 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
It is 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
It is one or more in sodium carboxymethylcellulose (CMC), Kynoar (PVDF), butadiene-styrene rubber (SBR) and polypropylene；It is conductive
Agent is not special for metal powder to be one or more in carbon black, graphite, carbon nanotubes, graphene and metal powder
It limits, can be various metal powders 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, negative electrode slurry 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 it is 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 one or more in carbon black, graphite, carbon nanotubes, graphene and metal powder, is not had for metal powder
It is special to limit, can be various metal powders commonly used in the art, this is known to those skilled in the art, no longer superfluous herein
It states.
In the method for the present invention, for the solvent that is used in anode sizing agent and negative electrode slurry, 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, ethyl alcohol or N- crassitudes
Ketone (NMP), the solvent used in negative electrode slurry can be water, ethyl alcohol or N-Methyl pyrrolidone (NMP).
In the method for the present invention, for the content of each component in anode sizing agent and negative electrode slurry, 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 negative electrode slurry,
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 anode sizing agent and negative electrode slurry respectively into
Before the processing of row ultrasound filtration, anode sizing agent and negative electrode slurry can be uniformly mixed.For by anode sizing agent and negative electrode slurry
There is no particular limitation for uniformly mixed mode, as long as can be uniformly mixed anode sizing agent and negative electrode slurry.In order to carry
The effect of high subsequent ultrasound filtration processing, under preferable case, the incorporation time of anode sizing agent and negative electrode slurry is small for 0.5-2
When.
In the method for the present invention, in order to further improve the qualification rate of monomer lithium-ion-power cell that sorting obtains, preferably
In the case of, the implementation number of ultrasound filtration processing is 3-5.It is further preferred that the implementation condition of ultrasound filtration processing includes：It is super
Acoustic frequency is 25-50kHz；Ultrasonic time is 3-60min, is still more preferably 15-35min；The mesh of sieve used in filtering
It is still more preferably 100-230 mesh for 50-500 mesh.It will be understood by those skilled in the art that the aforementioned ultrasonic time is
The time of primary ultrasound is carried out, moreover, ultrasound filtration processing is preferably first ultrasonically treated and is filtered processing again, and at this
In the case of kind, 1 ultrasound filtration processing is that 1 time carried out successively is ultrasonically treated and 1 filtration treatment, 2 ultrasound filtration processing
For 1 supersound process, 1 filtration treatment, 1 supersound process and 1 filtration treatment carried out successively.
In the method for the present invention, in order to further improve the qualification rate of monomer lithium-ion-power cell that sorting obtains, preferably
In the case of, the process that battery is prepared using the material that ultrasound filtration is handled is included：It handles to obtain using the ultrasound filtration
Material initial cells are made, and the initial cells are subjected to activation process and chemical conversion treatment successively.
It is not special to the method that initial cells are prepared using the material by ultrasound filtration processing in the method for the present invention
It limits, 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。
It, 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, including but not limited to methyl ethyl carbonate
(EMC), carbonic acid formicester (DC), ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), carbonic acid second fat etc..
In the method for the present invention, for preparing battery when membrane thicknesses used there is no particular limitation, can be this field
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, prepare battery case used during battery as aluminum alloy materials or stainless steel
Material.
In the method for the present invention, for the shape of battery, there is no particular limitation, can be commonly used in the art variously-shaped.
Under preferable case, the shape of battery is cylinder.
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
It is 20-30 hours.
In the method for the present invention, in order to further improve the qualification rate of monomer lithium-ion-power cell that sorting obtains, preferably
In the case of, 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 the electricity of chemical conversion
It flows for 0.6-15C5A is still more preferably 0.8-6C5A, the blanking voltage of chemical conversion is 3.8-4.0V.Those skilled in the art should
It should be appreciated 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 aforementioned 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 cycle remains above 85%, and can be pierced and tested by needle, securely and reliably.Under preferable case, electricity
The shape in pond is cylinder.
Second aspect, the present invention provides the lithium ions being prepared using the lithium-ion-power cell that the above method obtains
Power battery pack.
It is not special for the method that monomer lithium-ion-power cell is prepared as to lithium-ion-power cell group in the present invention
Restriction, can be commonly used in the art various by side that monomer lithium ion power battery combination is lithium-ion-power cell group
Method, such as monomer lithium-ion-power cell conducting wire or metal connecting sheet are used into serial or parallel connection or connection in series-parallel knot according to demand
The method of conjunction links together.
Embodiment
Below will by preparation example, comparison 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 field.
Wherein, 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 recycled 500 times under A is：QC/T743-2006.
Needle pierces the assay method tested：QC/T743-2006.
The assay method of the cycle life of lithium-ion-power cell group is：QC/T743-2006.
The instrument for measuring monomer lithium-ion-power cell surface temperature is infrared radiation thermometer, purchased from OMEGA companies, model
OS542。
Preparation example 1
This preparation example is used for the manufacturing method for illustrating monomer lithium-ion-power cell.
(1) by 5000g nickle cobalt lithium manganates, 150g carbon blacks, 150g Kynoar and 4000g N-Methyl pyrrolidones into
Row liquid phase mixes, and stirring forms uniform anode sizing agent in 1 hour, and 4 ultrasound filtration processing are then carried out to anode sizing agent,
In, primary be ultrasonically treated first is carried out when each ultrasound filtration is handled and 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 forms uniform negative electrode slurry in 1 hour, and 4 ultrasound filtration processing are then carried out to negative electrode slurry,
In, primary be ultrasonically treated first is carried out when each ultrasound filtration is handled and 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 negative electrode slurry 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
Negative electrode slurry and copper foil be bonded together, the coiled pole piece of anode and the coiled pole piece of cathode is respectively prepared, it is then that anode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of cathode 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, the injection 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) battery for sealing mouth at 35 DEG C is activated 25 hours, then carries 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 manufacturing method for illustrating monomer lithium-ion-power cell.
(1) 5000g nickel ion dopeds, 150g graphite, 150g carboxymethyl celluloses and 4000g ethyl alcohol are subjected to liquid phase mixing,
Stirring forms uniform anode sizing agent in 1.5 hours, and 3 ultrasound filtration processing are then carried out to anode sizing agent, wherein, it is ultrasonic every time
Primary be ultrasonically treated first is carried out 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 ethyl alcohol are subjected to liquid phase mixing, stirring
It forms uniform negative electrode slurry within 1.5 hours, 3 ultrasound filtration processing is then carried out to negative electrode slurry, wherein, each ultrasound filtration
Primary be ultrasonically treated first is carried out 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 negative electrode slurry 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
Negative electrode slurry and copper foil be bonded together, the coiled pole piece of anode and the coiled pole piece of cathode is respectively prepared, it is then that anode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of cathode 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, the injection 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) battery for sealing mouth at 40 DEG C is activated 20 hours, then carries 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 manufacturing 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 forms uniform anode sizing agent in 1 hour, then carries out 5 ultrasounds to anode sizing agent
Filtration treatment, wherein, primary be ultrasonically treated first is carried out when each ultrasound filtration is handled and carries out a filtration treatment again, and every time
The ultrasonic 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 N-Methyl pyrrolidones progress liquid phase are mixed
It closes, stirring forms uniform negative electrode slurry in 1 hour, and 5 ultrasound filtration processing are then carried out to negative electrode slurry, wherein, it is super every time
Primary be ultrasonically treated first is carried out 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 negative electrode slurry 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
Negative electrode slurry and copper foil be bonded together, the coiled pole piece of anode and the coiled pole piece of cathode is respectively prepared, it is then that anode is coiled
Pole piece is by the thickness of roll squeezer roll-in to 0.160mm, the thickness that the coiled pole piece of cathode 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, the injection 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) battery for sealing mouth at 30 DEG C is activated 30 hours, then carries 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
It flows 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
It flows 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.
Compare preparation example 1
According to the method for preparation example 1, the difference is that, it is respectively formed uniform anode sizing agent and cathode in step (1) and (2)
Without ultrasound filtration processing after slurry, but directly carry out step (3).
Compare preparation example 2
According to the method for preparation example 1, the difference is that, it is respectively formed uniform anode sizing agent and cathode in step (1) and (2)
Without ultrasound filtration processing after slurry, 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 comparison preparation example 1-2 respectively, pierces experiment and 23 into the hand-manipulating of needle
℃、1C5Capacity retention ratio determination experiment after being recycled 500 times under A, the results are shown in Table 1.
Table 1
Compared by the data of preparation example in table 1 and comparison preparation example it is found that starching anode sizing agent and cathode before preparing battery
Material carries out ultrasound filtration processing respectively, still has into the lithium-ion-power cell under state, manufactured in high current apparent
Higher energy density, capacity and cycle performance, moreover, in the feelings of energy density, capacity and cycle performance for not influencing battery
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 cycle remains above under A
85%, and can be pierced and tested by needle, securely and reliably.
Embodiment 1-9
Embodiment 1-9 is respectively used to the method for separating for illustrating the lithium-ion-power cell of the present invention.
It is fully charged to preparation example 1-7 and the obtained monomer lithium-ion-power cells of comparison preparation example 1-2 respectively, stand 40 points
Clock (preparation example 1-7 and comparison preparation example 1-2 correspond respectively to embodiment 1-9), corresponding to embodiment 1-9, respectively to aforementioned list
Body lithium-ion-power cell carries out constant-current discharge, and constant-current discharge electric current is respectively the predetermined peak value of monomer lithium-ion-power cell
3,1.5,5,3,3,3,3,3 and 3 times of operating current, when battery surface temperature is not higher than 50 DEG C, judgement monomer lithium ion moves
Power battery is qualified, and when battery surface temperature is higher than 50 DEG C, judgement monomer lithium-ion-power cell is unqualified.1-9 points of embodiment
To select the obtained qualification rate of monomer lithium-ion-power cell be respectively 87%, 89%, 86%, 81%, 82%, 76%, 78%,
32% and 31%.
Embodiment 10
According to the method for embodiment 1, the difference is that, constant-current discharge electric current is 7 times of predetermined peak value operating current.Embodiment
The qualification rate of monomer lithium-ion-power cell that 10 sortings obtain is 75%.
Comparative example 1
According to the method for embodiment 1, the difference is that, constant-current discharge electric current is 1 times of predetermined peak value operating current.
Comparative example 2
According to the method for embodiment 1, the difference is that, constant-current discharge electric current is 0.5C5A。
Comparative example 3
According to the method for embodiment 1, unlike, battery surface temperature is selected as 55-60 DEG C of monomer lithium ion power
Battery, for being combined into lithium-ion-power cell group.
Test example 2
In embodiment 1-10 and comparative example 1-3, the monomer lithium-ion-power cell of sorting is selected to be combined, wherein,
Method of the monomer lithium ion power battery combination for lithium-ion-power cell group is included：By 10 monomer lithium-ion-power cells
It is connected in series with metal connecting sheet.
To aforementioned combinatorial into lithium-ion-power cell group carry out 1C respectively5The complete charge and discharge circulation life determination experiments of A,
To capacity retention ratio be 80% when end-of-life.Embodiment 1-10 and the corresponding cycle-indexes of comparative example 1-3 are respectively
1880th, 1875,1870,1875,1878,1868,1871,1850,1830,1810,300,220 and 320.
By the results contrast of embodiment 1 and comparative example 1-3 it is found that carrying out capacity sorting to monomer lithium-ion-power cell
When, monomer lithium-ion-power cell is subjected to constant-current discharge with the electric current for being not less than the 1.5 of predetermined peak value operating current times, it can
Significantly improve the obtained monomer lithium ion power battery combination of sorting into lithium-ion-power cell group cycle life.And it is inciting somebody to action
Monomer lithium-ion-power cell be not less than the 1.5 of predetermined peak value operating current times electric current carry out constant-current discharge in the case of,
Monomer lithium-ion-power cell of the selection battery surface temperature not higher than 50 DEG C, can for being combined into lithium-ion-power cell group
Further improve the cycle life of lithium-ion-power cell group being combined into.
By the results contrast of embodiment 1 and embodiment 4 it is found that carrying out 3-5 ultrasound filtration processing, and in supersound process,
When supersonic frequency is 25-50kHz, and ultrasonic time is 15-35min, in the lithium-ion-power cell group for not influencing to be combined into
In the case of cycle life, the qualification rate of lithium-ion-power cell that sorting obtains can be further improved.
By the results contrast of embodiment 1 and embodiment 5-7 it is found that the battery for sealing mouth is carried out 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 cycle life of power battery pack, the qualification rate of lithium-ion-power cell that sorting obtains can be further improved.
By the results contrast of embodiment 1 and embodiment 8-9 it is found that distinguishing anode sizing agent and negative electrode slurry before preparing battery
Ultrasound filtration processing is carried out, under high current under chemical conversion state, in the cycle of lithium-ion-power cell group for not influencing to be combined into
In the case of service life, the qualification rate of lithium-ion-power cell that sorting obtains can be significantly improved.
By the results contrast of embodiment 1 and embodiment 10 it is found that by the monomer lithium-ion-power cell with predetermined peak value work
When making 1.5-5 times of electric current of electric current and carrying out constant-current discharge, the lithium-ion-power cell group that can further improve combination is followed
The qualification rate of lithium-ion-power cell that ring service life and sorting obtain.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of simple variants can be carried out to technical scheme of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, 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 also be regarded as the disclosure of the present invention.
Claims (9)
1. a kind of method for separating of lithium-ion-power cell, which is characterized in that the method includes：By alternative monomer lithium ion
Power battery is fully charged, stands, then by the monomer lithium-ion-power cell with 1.5-5 times of electricity of predetermined peak value operating current
Stream carries out constant-current discharge, the monomer lithium-ion-power cell that battery surface temperature is selected to be not higher than 50 DEG C；
The method further includes：Monomer lithium-ion-power cell is prepared by method comprising the following steps：By anode sizing agent and
Negative electrode slurry carries out ultrasound filtration processing respectively, then prepares battery, the utilization using the material that ultrasound filtration is handled
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 the electric current of chemical conversion 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 energy density of the monomer lithium-ion-power cell is higher than 130Wh/
Kg, cycle life are more than 500 times.
3. according to the method described in claim 2, wherein, the shape of the monomer lithium-ion-power cell is cylinder.
4. according to the method described in claim 1, wherein, the implementation number of the ultrasound filtration processing is 3-5.
5. according to the method described in claim 1, wherein, the implementation condition of the ultrasound filtration processing includes：Supersonic frequency is
25-50kHz；Ultrasonic time is 3-60min；The mesh of sieve used in filtering is 50-500 mesh.
6. according to the method described in claim 5, wherein, ultrasonic time 15-35min.
7. according to the method described in claim 5, wherein, the mesh of sieve used in filtering is 100-230 mesh.
8. 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,
It is one or more in ferric phosphate cobalt lithium and phosphoric acid ferrimanganic cobalt lithium；The negative electrode slurry 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 it is one or more.
9. it is moved using the lithium ion that the lithium-ion-power cell that any one the method in claim 1-8 obtains is prepared
Power battery pack.
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| CN102208573B (en) * | 2011-04-22 | 2013-07-31 | 东风汽车公司 | Power battery pack arrangement, connection and assembly structure |
| CN102364353B (en) * | 2011-11-14 | 2013-10-16 | 北京理工大学 | Method for assessing consistency of secondary battery based on heating effect |
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