CN202797166U - Square lithium ion power battery - Google Patents
Square lithium ion power battery Download PDFInfo
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- CN202797166U CN202797166U CN201220434489XU CN201220434489U CN202797166U CN 202797166 U CN202797166 U CN 202797166U CN 201220434489X U CN201220434489X U CN 201220434489XU CN 201220434489 U CN201220434489 U CN 201220434489U CN 202797166 U CN202797166 U CN 202797166U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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
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Abstract
The utility model discloses a large-capacity square lithium ion power battery which comprises a square case and a plurality of square battery cells, each square battery cell is formed by winding a positive plate, a negative plate and a membrane into a square shape, a positive current collector in the positive plate extends out of each square battery cell formed by means of winding and is subjected to cutting and welding to form a positive current collector connection end, a negative current collector in the negative plate extends out of each square battery cell formed by means of winding and is subjected to cutting and welding to form a negative current collector connection end, the positive current collector connection ends of the plurality of the square battery cells are connected with a positive column through a positive bus sheet, and the negative current collector connection ends of the plurality of the square battery cells are connected with a negative column through a negative bus sheet, so that the high-rate charge-discharge property and the circulation performance of the square lithium ion power battery are improved. The square lithium ion power battery provided by the utility model can be applied to the field of traffic tools like a batter electric vehicle and an electric ship.
Description
Technical field
The utility model relates to lithium-ion-power cell and preparation field thereof, is specifically related to a kind of square lithium ion power battery.
Background technology
Along with being becoming tight world energy sources and Environmental Protection Situation day, lithium ion battery is looked at as the parent that new forms of energy more and more are subject to people.Lithium ion battery becomes the main direction of new forms of energy development because its energy density is high, and volume is light, and weight is little, and is environment friendly and pollution-free.Fast development along with electric automobile, space technology, national defense industry and electric energy storing system etc., have higher requirement in the aspects such as specific capacity, cycle life and fail safe to lithium ion battery, the chemical property of improvement and raising lithium ion battery can be from the aspects such as internal structure of electrode material and improvement high capacity cell.
The development need power-type lithium ion battery of the vehicles such as pure electric automobile has the performances such as large capacity, high-energy-density, high power density and high security.But because the manufacturing process of lithium-ion-power cell is to follow LiCoO substantially at present
2The technological process of production of/C battery causes high capacity lithium ion battery not taking into account simultaneously aspect energy density and the power density, and particularly the high capacity lithium ion battery power density is generally lower.Therefore, improve the internal structure design of high capacity cell, the structural design of especially anodal and negative current collector, improve the reliability that collector connects, can be under the prerequisite that energy content of battery density guarantees, significantly reduce the polarization in the electrode process and improve electrochemical reaction dynamics, thereby improve high power charge-discharge characteristic, cycle performance and the security performance of battery.
Publication number is that the Chinese invention patent application of CN 1588688A discloses a kind of lithium-ion-power cell, comprise the shell with positive and negative pole, also comprise many group energy units, described energy unit setting in the enclosure, and arrange along the length direction of the maximum side surface of shell, described energy unit is the volume core that positive and negative plate forms by barrier film interval coiling multi-turn, be connected with respectively positive and negative lug on the positive and negative plate of described volume core, the positive and negative lug of all energy units is connected to respectively the positive and negative pole of shell.The traditional positive and negative lug of this technical scheme employing is drawn the positive and negative pole that is connected to shell and is prepared lithium-ion-power cell, the reliability that positive and negative lug connects is lower, and easily polarization in the electrode process, during cycle-index 300 times, cycle performance (capability retention) is 90%, and cycle-index surpasses after 1000 times, and its capability retention descends very fast, be generally between 50% ~ 60%, its charge-discharge characteristic, cycle performance and security performance all remain further to be improved.
Granted publication number discloses a kind of square power lithium ion cell of high efficiency for the utility model patent of CN202333058U, the battery that comprises coiling, described battery is by positive plate, negative plate and membrane winding form, positive plate comprises plus plate current-collecting body and the positive electrode active materials coating that is produced on the plus plate current-collecting body, negative plate comprises negative current collector and the negative active core-shell material coating that is produced on the negative current collector, the two end portions of described battery is exposed respectively plus plate current-collecting body and negative current collector, the direct plus plate current-collecting body of an end with battery of the anodal exit of battery connects, and the direct negative current collector of an end with battery of the negative pole exit of battery connects.This technical scheme is by simplifying power lithium-ion battery production procedure and structural design, improve reliability and fail safe, but it does not improve to the structure of battery and to arranging of the battery in the battery, thereby causes its charge-discharge characteristic, cycle performance and security performance not good.
The utility model content
The purpose of this utility model provides a kind of large capacity square lithium ion power battery, by the structure of improvement square electric cell and the arrangement architecture of several square electric cells, to improve high-rate charge-discharge capability and the cycle performance of square lithium ion power battery.
A kind of square lithium ion power battery, comprise with the square shell of positive terminal and negative terminal and several square electric cells that place described square shell inner lamination to arrange, described square electric cell is by positive plate, barrier film and negative plate are wound into square forming, described positive plate comprises plus plate current-collecting body and the positive electrode active materials coating that is coated on the plus plate current-collecting body, described negative plate comprises negative current collector and the negative active core-shell material coating that is coated on the negative current collector, the axial end of square electric cell that described plus plate current-collecting body forms from reeling stretches out and cuts welding and forms the plus plate current-collecting body link, the axial other end of square electric cell that described negative current collector forms from reeling stretches out and cuts welding and forms the negative current collector link, plus plate current-collecting body link on described several square electric cells links to each other with described positive terminal by the positive pole sheet that confluxes, and the negative current collector link on described several square electric cells links to each other with described negative terminal by the negative pole sheet that confluxes.
The utility model is by improving the internal structure design of high capacity cell, namely improve the structure of square electric cell and the arrangement architecture of square electric cell, particularly plus plate current-collecting body stretches out and cut welding formation plus plate current-collecting body link from the square electric cell that reel to form, the square electric cell that negative current collector forms from reeling stretches out and cuts welding and forms the negative current collector link, the plus plate current-collecting body link of each square electric cell links to each other with the positive plate of each winding layer after the cutting welding, the negative current collector link of each square electric cell links to each other with the negative plate of each winding layer after the cutting welding, and can improve the reliability that collector connects, can be under the prerequisite that energy content of battery density guarantees, significantly reduce the polarization in the electrode process and improve electrochemical reaction dynamics, thereby improve the high power charge-discharge characteristic of battery, cycle performance and security performance.
As preferably, the number of plies that described positive plate, barrier film and negative plate are reeled is at least two-layer, the number of plies of reeling refers to that it is one deck that positive plate, barrier film and negative plate are combined around coiling axis one circle, described plus plate current-collecting body link all links to each other with all layers positive plate, and described negative current collector link all links to each other with all layers negative plate.
The each side such as square electric cell can battery capacity, battery charging/discharging characteristic need to be selected, and as preferably, described square electric cell is 8 ~ 20.Described square electric cell is 112mm ~ 212mm along the axial maximum length of reeling, the width of described square electric cell is 40mm ~ 60mm, the thickness of described square electric cell is 8mm ~ 10mm, the number of above-mentioned square electric cell and the size of square electric cell can guarantee that the utility model square lithium ion power battery has preferably charge-discharge characteristic, cycle performance and security performance.
As preferably, the axial length that described plus plate current-collecting body link is reeled along square electric cell is 8mm ~ 12mm, and the width of described plus plate current-collecting body link is 8mm ~ 20mm, and its thickness gets final product with the thickness that welds rear self-assembling formation, can not do strict demand.The axial length that described negative current collector link is reeled along square electric cell is 8mm ~ 12mm, and the width of described negative current collector link is 8mm ~ 20mm, and its thickness gets final product with the thickness that welds rear self-assembling formation, can not do strict demand.As preferably, the conflux width 12mm ~ 30mm of sheet of described positive pole, thickness 0.6mm ~ 1.2mm, the conflux width 12mm ~ 30mm of sheet of described negative pole, thickness 0.3mm ~ 0.5mm, the positive pole sheet that confluxes is connected with negative pole that the length of sheet connects the number of square electric cell as required, tightness degree and the square shell size that square electric cell is arranged specifically determined.The above-mentioned setting can further be improved the reliability that collector connects, can be under the prerequisite that energy content of battery density guarantees, significantly reduce the polarization in the electrode process and improve electrochemical reaction dynamics, thereby further improve high power charge-discharge characteristic, cycle performance and the security performance of battery.
As preferably, described square shell with positive terminal and negative terminal comprises square Al-alloy casing and with the Aluminum Alloy Cover of positive terminal and negative terminal, the size of described square Al-alloy casing (not containing positive and negative terminals) is (43 ~ 63) mm * (98 ~ 286) mm * (108 ~ 206) mm, several square electric cells in the described square shell are the stratiform close-packed arrays, thereby the compactedness that can keep on the one hand structure, conveniently use and carry, on the other hand, can guarantee the stability that battery uses.
As preferably, described plus plate current-collecting body is aluminium foil, described negative current collector is Copper Foil, the described positive pole sheet that confluxes is aluminium strip, described negative current collector is copper strips, be conducive to reduce the polarization in the electrode process and improve electrochemical reaction dynamics, thereby improve high power charge-discharge characteristic, cycle performance and the security performance of battery.
As preferably, described barrier film is porous polypropylene (PP) barrier film or porous polyethylene (PE)/polypropylene (PP)/polyethylene (PE) multilayer complex films.
As preferably, the sheet welding of confluxing of the plus plate current-collecting body link on described several square electric cells and described positive pole, described positive pole confluxes sheet with the welding of described positive terminal or rivets; The conflux sheet welding of negative current collector link on described several square electric cells and described negative pole, described negative pole confluxes sheet with the welding of described negative terminal or rivets.The above-mentioned setting can further be improved plus plate current-collecting body link and the anodal sheet that confluxes, positive pole sheet and positive terminal and negative current collector link and the negative pole reliability that sheet, negative pole conflux and be connected between sheet and the negative terminal of confluxing of confluxing, can be under the prerequisite that energy content of battery density guarantees, significantly reduce the polarization in the electrode process and improve electrochemical reaction dynamics, thereby further improve high power charge-discharge characteristic, cycle performance and the security performance of battery.
A kind of preparation method of square lithium ion power battery has simplified production technology, and its technique is easy to the industrial high efficiency rate and produces, and the square lithium ion power battery for preparing by this preparation method has more excellent performance.
A kind of preparation method of square lithium ion power battery comprises the processing square electric cell and to this square battery core encapsulation, the step of described processing square electric cell is as follows:
1) monolateral positive plate, barrier film and the monolateral negative plate that leaves uncoated negative active core-shell material coating that leaves uncoated positive electrode active materials coating together is wound into square, wherein on the positive plate on the monolateral and negative plate of uncoated positive electrode active materials coating uncoated negative active core-shell material coating monolateral be in respectively wireline reel to two ends;
2) the monolateral of uncoated positive electrode active materials coating forms the plus plate current-collecting body link through cutting, ultrasonic bonding on the positive plate after will reeling; The monolateral of uncoated negative active core-shell material coating on the negative plate after reeling formed the negative current collector link through cutting, energy storage electric resistance welding, obtain square electric cell.
Step to this square battery core encapsulation is as follows:
3) with the tight layered arrangement of several square electric cells, and the negative current collector link on the plus plate current-collecting body link on each square electric cell and each square electric cell is welded on respectively conflux sheet and negative pole of positive pole confluxes on the sheet, sheet and the negative pole sheet that confluxes that again positive pole confluxed welds respectively or is riveted on the positive terminal and negative terminal on the Aluminum Alloy Cover, put into square Al-alloy casing, conflux sheet and negative pole of positive pole confluxes and places the polyethylene insulation sheet between sheet and square aluminum alloy inner walls, Aluminum Alloy Cover and square Al-alloy casing laser welding are made square lithium ion power battery behind the injection electrolyte.
In the step 1), the monolateral preparation that leaves the positive plate of uncoated positive electrode active materials coating comprises:
A) preparation of positive electrode active materials: lithium salts, nickel salt, manganese salt and cobalt salt are dissolved in ethanol, form the slaine ethanolic solution, with the slaine ethanolic solution under air or oxygen atmosphere 400 ℃ ~ 600 ℃ light, light afterreaction 5min ~ 15min, cooling obtains positive electrode active materials aLi again after 700 ℃ ~ 900 ℃ annealing afterwards
2MnO
3(1-a) LiMO
2, wherein, 0.4≤a≤0.6, M=Mn
xNi
yCo
z, 1/3≤x≤0.4,1/3≤y≤0.4, and 4x+2y+3z=3;
B) content takes by weighing positive electrode active materials aLi in 90% ~ 92% step a) by mass percentage
2MnO
3(1-a) LiMO
2, 4% ~ 6% conductive agent and 3% ~ 5% binding agent, obtain compound, after adding 1-methyl 2-Pyrrolidone solvent vacuum stirring is even, continuous two-sidedly coat on the plus plate current-collecting body and in positive and negative two the monolateral parts that leave uncoated positive electrode active materials coating of plus plate current-collecting body homonymy, continuous rolling behind the oven dry removal 1-methyl 2-Pyrrolidone solvent makes the monolateral positive plate that leaves uncoated positive electrode active materials coating after cutting.
In the step a), the amount of lithium salts, nickel salt, manganese salt and cobalt salt mainly adds by the stoichiometric proportion of each element in the required layer structure lithium ion battery positive electrode, and it is excessive 1% ~ 6% that general lithium salts is wanted, thereby offsets the loss of lithium under the high temperature.Described lithium salts is LiNO
3Or LiCH
3COO2H
2O.Described nickel salt is Ni (NO
3)
26H
2O or Ni (CH
3COO)
24H
2O.Described manganese salt is Mn (NO
3)
26H
2O or Mn (CH
3COO)
24H
2O.Described cobalt salt is Co (CH
3COO)
24H
2O.The combustion-supporting method of ethanol is adopted in the preparation of this positive electrode active materials, the process of sol-gel in the middle of not relating to, and preparation process is simple, and the positive electrode active materials of preparation is equally distributed tiny primary particle and has good crystallinity, Li when being conducive to initial charge
2MnO
3The activation in zone provides the contact area of a considerable electrolyte and active material, has shortened the diffusion length of lithium ion in the material solid phase, thus Effective Raise the high rate performance of material.
This preparation method has simplified production procedure, be conducive to suitability for industrialized production, and adopt different welding procedures to be conducive to guarantee the degree of being connected firmly of each tie point, particularly through cutting, the plus plate current-collecting body link of the square electric cell that ultrasonic bonding forms and through cutting, the negative current collector link that the energy storage electric resistance welding forms all links to each other with negative plate with the positive plate of each winding layer, its structural design also helps and reduces the internal resistance of cell, thereby greatly improved the performance of the square lithium ion power battery of preparation, thereby greatly improved the high power charge-discharge characteristic of battery, cycle performance and security performance.
Compared with prior art, the utlity model has following advantage:
The utility model square lithium ion power battery, improve the structure of square electric cell and the arrangement architecture of square electric cell, particularly plus plate current-collecting body link and the negative current collector link of each square electric cell can form a plurality of afflux contact points after the cutting welding, so that the even dense distribution of both positive and negative polarity collector in the utility model square lithium ion power battery, the plus plate current-collecting body link is connected with convergent belt reliably with the negative current collector link, can guarantee balanced current distribution in electrode process, reduce the electrochemical reaction polarization and improve electrochemical reaction dynamics, thereby improve the high power characteristic of high capacity cell, cycle performance of battery is stable, security reliability is good, can be used for the vehicles such as electric automobile.
The preparation method of this square lithium-ion-power cell has simplified production procedure, be conducive to suitability for industrialized production, and adopt different welding procedures to be conducive to guarantee the degree of being connected firmly of each tie point, its structural design also helps and reduces the internal resistance of cell, greatly improve the performance of the square lithium ion power battery of preparation, thereby greatly improved high power charge-discharge characteristic, cycle performance and the security performance of battery.
Description of drawings
Fig. 1 is that positive plate, barrier film and negative plate are wound into square structural representation in the utility model;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of the square electric cell after the cutting welding forms plus plate current-collecting body link and negative current collector link;
Fig. 4 is the structural representation of several square electric cell assemblings in the utility model square lithium ion power battery.
Embodiment
Below in conjunction with accompanying drawing the utility model square lithium ion power battery is described further.
As shown in Figure 4, the utility model square lithium ion power battery, comprise with the square shell (not shown) of positive terminal and negative terminal and several square electric cells 1 that place the square shell inner lamination to arrange, such as Fig. 1, Fig. 2 and shown in Figure 3, square electric cell 1 is by positive plate, barrier film and negative plate are wound into square forming, positive plate comprises plus plate current-collecting body and the positive electrode active materials coating that is coated on the plus plate current-collecting body, negative plate comprises negative current collector and the negative active core-shell material coating that is coated on the negative current collector, the axial end of square electric cell that plus plate current-collecting body forms from reeling stretches out and cuts welding and forms plus plate current-collecting body link 2, and the other end that the square electric cell that negative current collector forms from reeling is axial and cutting welding form negative current collector link 3.The number of plies that positive plate, barrier film and negative plate are reeled is at least two-layer, the number of plies of reeling refers to that it is one deck that positive plate, barrier film and negative plate are combined around coiling axis one circle, plus plate current-collecting body link 2 all links to each other with all layers positive plate, and negative current collector link 3 all links to each other with all layers negative plate.As shown in Figure 4, the plus plate current-collecting body link 2 on several square electric cells links to each other with positive terminal by the positive pole sheet 4 that confluxes, and the negative current collector link 3 on several square electric cells links to each other with negative terminal by the negative pole sheet 5 that confluxes.
Square electric cell 1 is 8 ~ 20.Square electric cell 1 is 112mm ~ 212mm along the axial maximum length H that reels, and the width W of square electric cell is 40mm ~ 60mm, and the thickness T of square electric cell is 8mm ~ 10mm.The axial length m that the plus plate current-collecting body link is reeled along square electric cell is 8mm～12mm, the width R of plus plate current-collecting body link is 8mm ~ 20mm, the axial length n that the negative current collector link is reeled along square electric cell is 8mm～12mm, the width S of negative current collector link is 8mm ~ 20mm, and the width h of barrier film is 96mm ~ 274mm.Plus plate current-collecting body is aluminium foil, and negative current collector is Copper Foil, and conflux sheet 4 of positive pole is aluminium strip, and negative current collector 5 is copper strips, and barrier film is porous polypropylene (PP) barrier film or porous polyethylene (PE)/polypropylene (PP)/polyethylene (PE) multilayer complex films.
Preparation example 1
1) preparation of positive electrode active materials: press the mol ratio of 1.236:0.56:0.16:0.08 with raw material LiNO
3, Mn (CH
3COO)
24H
2O, Ni (CH
3COO)
26H
2O and Co (CH
3COO)
24H
2O is dissolved in absolute ethyl alcohol (wherein added excessive 3% lithium salts, be used for offsetting the loss of lithium under the high temperature), forms the slaine ethanolic solution, and the total concentration of lithium salts, nickel salt, manganese salt and cobalt salt is 1mol/L in the slaine ethanolic solution.
Get 10mL slaine ethanolic solution and put into the corundum crucible of 100mL, corundum crucible is put in the box type furnace that is heated in advance 500 ℃, light, vigorous reaction is 10 minutes in air, 25 ℃ of cool to room temperature, the primary product that obtains will be put in the box type furnace after the primary product grinding again, after carrying out annealing in process 16h under 800 ℃ of high temperature, with 25 ℃ of stove cool to room temperature, obtain positive electrode active materials.
The positive electrode active materials of preparation is passed through ICP-AES[Inductively Coupled Plasma Atomic Emission Spectrometry (ICP, IRIS Intrepid II) inductively coupled plasma atomic emission] test, measure the content of each element according to ICP-AES, by normalization, determine that its chemical formula is Li[Li
0.2Mn
0.56Ni
0.16Co
0.08] O
2, from X-ray diffractogram, as can be known, show Li
2MnO
3The existence of ordered structure microcell namely also can be write as 0.5Li
2MnO
30.5Li Mn
0.4Ni
0.4Co
0.2O
2From stereoscan photograph as can be known, the positive electrode active materials Li[Li of present embodiment preparation
0.2Mn
0.56Ni
0.16Co
0.08] O
2Be equally distributed tiny primary particle, size is 50nm ~ 150nm, and has good crystallinity.
2) the monolateral preparation that leaves the positive plate of uncoated positive electrode active materials coating: content takes by weighing the positive electrode active materials 0.5Li of 92% step 1) preparation by mass percentage
2MnO
30.5LiMn
0.4Ni
0.4Co
0.2O
2, 5% conductive agent (Cabot Cabot50 conductive carbon black) and 3% binding agent (polyvinylidene fluoride, technical grade, east, Shanghai fluorine chemical Science and Technology Ltd., model is FR901), obtain compound, adding with respect to 40% 1-methyl 2-Pyrrolidone (NMP) solvent vacuum stirring of compound weight evenly after, continuous two-sidedly coat on the aluminium foil and in positive and negative two the monolateral parts that leave uncoated positive electrode active materials coating of aluminium foil homonymy, continuous rolling behind the oven dry removal nmp solvent makes the monolateral positive plate that leaves uncoated positive electrode active materials coating after cutting.
Preparation example 2
1) preparation of positive electrode active materials: press the mol ratio of 1.236:0.54:0.13:0.13 with raw material LiNO
3, Mn (NO
3)
26H
2O, Ni (NO
3)
26H
2O and Co (CH
3COO)
24H
2O is dissolved in absolute ethyl alcohol (wherein added excessive 3% lithium salts, be used for offsetting the loss of lithium under the high temperature), forms the slaine ethanolic solution, and the total concentration of lithium salts, nickel salt, manganese salt and cobalt salt is 2mol/L in the slaine ethanolic solution.
Get 10mL slaine ethanolic solution and put into the corundum crucible of 100mL, corundum crucible is put in the box type furnace that is heated in advance 500 ℃, light, vigorous reaction is 10 minutes in air, 25 ℃ of cool to room temperature, the primary product that obtains will be put in the box type furnace after the primary product grinding again, after carrying out annealing in process 16h under 800 ℃ of high temperature, with 25 ℃ of stove cool to room temperature, obtain positive electrode active materials.
The positive electrode active materials of preparation is passed through ICP-AES[Inductively Coupled Plasma Atomic Emission Spectrometry (ICP, IRIS Intrepid II) inductively coupled plasma atomic emission] test, measure the content of each element according to ICP-AES, by normalization, determine that its chemical formula is Li[Li
0.2Mn
0.54Ni
0.13Co
0.13] O
2, from X-ray diffractogram, as can be known, show Li
2MnO
3The existence of ordered structure microcell namely also can be write as 0.5Li
2MnO
30.5Li Mn
1/3Ni
1/3Co
1/3O
2From stereoscan photograph as can be known, the positive electrode active materials Li[Li of present embodiment preparation
0.2Mn
0.54Ni
0.13Co
0.13] O
2Be equally distributed tiny primary particle, size is 50nm ~ 150nm, and has good crystallinity.
2) the monolateral preparation that leaves the positive plate of uncoated positive electrode active materials coating: content takes by weighing the positive electrode active materials 0.5Li of 92% step 1) preparation by mass percentage
2MnO
30.5LiMn
1/3Ni
1/3Co
1/3O
2, 5% conductive agent (Cabot Cabot50 conductive carbon black) and 3% binding agent (polyvinylidene fluoride, technical grade, east, Shanghai fluorine chemical Science and Technology Ltd., model is FR901), obtain compound, adding with respect to 40% 1-methyl 2-Pyrrolidone (NMP) solvent vacuum stirring of compound weight evenly after, continuous two-sidedly coat on the aluminium foil and in positive and negative two the monolateral parts that leave uncoated positive electrode active materials coating of aluminium foil homonymy, continuous rolling behind the oven dry removal nmp solvent makes the monolateral positive plate that leaves uncoated positive electrode active materials coating after cutting.
Preparation example 3
The monolateral preparation that leaves the negative plate of uncoated negative active core-shell material coating: content takes by weighing 93% modified natural graphite (Shenzhen Bei Terui Electron Material Co., Ltd by mass percentage, model is CG-8), 3% conductive agent (Cabot Cabot50 conductive carbon black) and 4% aqueous binders (CMC: the volume ratio of butadiene-styrene rubber (SBR-1500) is 1:1), obtain compound, adding with respect to 60% deionized water vacuum stirring of compound weight evenly after, continuous two-sidedly coat on the Copper Foil and in positive and negative two the monolateral parts that leave uncoated negative active core-shell material coating of Copper Foil homonymy, continuous rolling behind the oven dry deionized water; Make the monolateral negative plate that leaves uncoated negative active core-shell material coating after cutting.
1) (width C is 99mm preparation example 1 preparation monolateral to be left the positive plate of uncoated positive electrode active materials coating, monolaterally leave uncoated positive electrode active materials coating layer portion 13mm), porous polypropylene barrier film (width h is 96mm) and preparation example 3 preparations monolateral left the negative plate of uncoated negative active core-shell material coating, and (width A is 101mm, monolaterally leave uncoated negative active core-shell material coating layer portion 11mm) together be wound into square, wherein on the positive plate on the monolateral and negative plate of uncoated positive electrode active materials coating uncoated negative active core-shell material coating monolateral be in respectively wireline reel to two ends;
2) monolateral (aluminium foil) of uncoated positive electrode active materials coating forms plus plate current-collecting body link 2 through cutting, ultrasonic bonding on the positive plate after will reeling again, monolateral (Copper Foil) of uncoated negative active core-shell material coating on the negative plate after reeling formed negative current collector link 3 through cutting, energy storage electric resistance welding, obtain square electric cell 1;
Square electric cell 1 is 112mm along the axial maximum length H that reels, and the width W of square electric cell is 49mm, and the thickness T of square electric cell is 9.2mm.The axial length m that plus plate current-collecting body link 2 is reeled along square electric cell is 8mm, the width R of plus plate current-collecting body link 2 is 8mm, the axial length n that negative current collector link 3 is reeled along square electric cell is 8mm, and the width S of negative current collector link 3 is 8mm;
3) square electric cell 1 is 10, with 10 square electric cells, 1 tight layered arrangement, namely stack up and down successively compression, plus plate current-collecting body link 2 on each square electric cell 1 is welded on the positive pole sheet 4(aluminium strip that confluxes, width 12mm, thickness 0.6mm) on, negative current collector link 3 on each square electric cell 1 is welded on the negative pole sheet 5(copper strips that confluxes, width 12mm, thickness 0.3mm) on, sheet 4 and the negative pole sheet 5 that confluxes that again positive pole confluxed is welded on respectively on the positive terminal and negative terminal of surveying in the Aluminum Alloy Cover, put into the square Al-alloy casing that is of a size of 52mm * 98mm * 108mm, conflux sheet 4 and negative pole of positive pole confluxes and places the polyethylene insulation sheet between sheet 5 and square aluminum alloy inner walls, Aluminum Alloy Cover and square Al-alloy casing laser welding, injection LiPF
6Electrolyte is [with volume ratio 1:1 diethyl carbonate (DEC) and ethylene carbonate (EC) as solvent, with LiPF
6Be dissolved in the solvent, make electrolyte, LiPF in the electrolyte
6Concentration be 1mol/L] after make the square lithium ion power battery that design capacity is 50Ah.
The utility model square lithium ion power battery through in 25 ± 2 ℃ of environment with 0.1C(5A) be charged to 3.65V, shelve 10min, 0.1C after being discharged to 2.5V and changing into, iterative cycles is measured the charge-discharge performance of the utility model square lithium ion power battery and the variation of cyclical stability.
1) (width C is 189mm preparation example 2 preparation monolateral to be left the positive plate of uncoated positive electrode active materials coating, monolaterally leave uncoated positive electrode active materials coating layer portion 17mm), porous polypropylene barrier film (width h is 186mm) and preparation example 3 preparations monolateral left the negative plate of uncoated negative active core-shell material coating, and (width A is 192mm, monolaterally leave uncoated negative active core-shell material coating layer portion 14mm) together be wound into square, wherein on the positive plate on the monolateral and negative plate of uncoated positive electrode active materials coating uncoated negative active core-shell material coating monolateral be in respectively wireline reel to two ends;
2) monolateral (aluminium foil) of uncoated positive electrode active materials coating forms plus plate current-collecting body link 2 through cutting, ultrasonic bonding on the positive plate after will reeling again, monolateral (Copper Foil) of uncoated negative active core-shell material coating on the negative plate after reeling formed negative current collector link 3 through cutting, energy storage electric resistance welding, obtain square electric cell 1;
Square electric cell 1 is 206mm along the axial maximum length H that reels, and the width W of square electric cell is 49mm, and the thickness T of square electric cell is 9.2mm.The axial length m that plus plate current-collecting body link 2 is reeled along square electric cell is 10mm, the width R of plus plate current-collecting body link 2 is 15mm, the axial length n that negative current collector link 3 is reeled along square electric cell is 10mm, and the width S of negative current collector link 3 is 15mm;
3) square electric cell 1 is 10, with 10 square electric cells, 1 tight layered arrangement, namely stack up and down successively compression, plus plate current-collecting body link 2 on each square electric cell 1 is welded on the positive pole sheet 4(aluminium strip that confluxes, width 20mm, thickness 0.8mm) on, negative current collector link 3 on each square electric cell 1 is welded on the negative pole sheet 5(copper strips that confluxes, width 20mm, thickness 0.4mm) on, sheet 4 and the negative pole sheet 5 that confluxes that again positive pole confluxed is welded on respectively on the positive terminal and negative terminal of surveying in the Aluminum Alloy Cover, put into the square Al-alloy casing that is of a size of 52mm * 196mm * 108mm, conflux sheet 4 and negative pole of positive pole confluxes and places the polyethylene insulation sheet between sheet 5 and square aluminum alloy inner walls, Aluminum Alloy Cover and square Al-alloy casing laser welding, inject LiPF6 electrolyte [with volume ratio 1:1 diethyl carbonate (DEC) and ethylene carbonate (EC) as solvent, with LiPF
6Be dissolved in the solvent, make electrolyte, LiPF in the electrolyte
6Concentration be 1mol/L] after make the square lithium ion power battery that design capacity is 10Ah.
The utility model square lithium ion power battery through in 25 ± 2 ℃ of environment with 0.1C(10A) be charged to 3.65V, shelve 10min, 0.1C after being discharged to 2.5V and changing into, iterative cycles is measured the charge-discharge performance of the utility model square lithium ion power battery and the variation of cyclical stability.
1) (width C is 278mm preparation example 1 preparation monolateral to be left the positive plate of uncoated positive electrode active materials coating, monolaterally leave uncoated positive electrode active materials coating layer portion 20mm), porous polypropylene barrier film (width h is 274mm) and preparation example 3 preparations monolateral left the negative plate of uncoated negative active core-shell material coating, and (width A is 281mm, monolaterally leave uncoated negative active core-shell material coating layer portion 17mm) together be wound into square, wherein on the positive plate on the monolateral and negative plate of uncoated positive electrode active materials coating uncoated negative active core-shell material coating monolateral be in respectively wireline reel to two ends;
2) monolateral (aluminium foil) of uncoated positive electrode active materials coating forms plus plate current-collecting body link 2 through cutting, ultrasonic bonding on the positive plate after will reeling again, monolateral (Copper Foil) of uncoated negative active core-shell material coating on the negative plate after reeling formed negative current collector link 3 through cutting, energy storage electric resistance welding, obtain square electric cell 1;
Square electric cell 1 is 298mm along the axial maximum length H that reels, and the width W of square electric cell is 49mm, and the thickness T of square electric cell is 9.2mm.The axial length m that the plus plate current-collecting body link is reeled along square electric cell is 12mm, the width R of plus plate current-collecting body link is 20mm, the axial length n that the negative current collector link is reeled along square electric cell is 8mm, and the width S of negative current collector link is 20mm;
3) square electric cell 1 is 10, with 10 square electric cells, 1 tight layered arrangement, namely stack up and down successively compression, plus plate current-collecting body link 2 on each square electric cell 1 is welded on the positive pole sheet 4(aluminium strip that confluxes, width 30mm, thickness 1.0mm) on, negative current collector link 3 on each square electric cell 1 is welded on the negative pole sheet 5(copper strips that confluxes, width 30mm, thickness 0.5mm) on, sheet 4 and the negative pole sheet 5 that confluxes that again positive pole confluxed is welded on respectively on the positive terminal and negative terminal of surveying in the Aluminum Alloy Cover, put into the square Al-alloy casing that is of a size of 54mm * 286mm * 108mm, conflux sheet 4 and negative pole of positive pole confluxes and places the polyethylene insulation sheet between sheet 5 and square aluminum alloy inner walls, Aluminum Alloy Cover and square Al-alloy casing laser welding, injection LiPF
6Electrolyte is [with volume ratio 1:1 diethyl carbonate (DEC) and ethylene carbonate (EC) as solvent, with LiPF
6Be dissolved in the solvent, make electrolyte, LiPF in the electrolyte
6Concentration be 1mol/L] after make the square lithium ion power battery that design capacity is 150Ah.
The utility model square lithium ion power battery through in 25 ± 2 ℃ of environment with 0.1C(5A) be charged to 3.65V, shelve 10min, 0.1C after being discharged to 2.5V and changing into, iterative cycles is measured the charge-discharge performance of the utility model square lithium ion power battery and the variation of cyclical stability.
1) (width C is 189mm preparation example 2 preparation monolateral to be left the positive plate of uncoated positive electrode active materials coating, monolaterally leave uncoated positive electrode active materials coating layer portion 17mm), porous polypropylene barrier film (width h is 186mm) and preparation example 3 preparations monolateral left the negative plate of uncoated negative active core-shell material coating, and (width A is 192mm, monolaterally leave uncoated negative active core-shell material coating layer portion 14mm) together be wound into square, wherein on the positive plate on the monolateral and negative plate of uncoated positive electrode active materials coating uncoated negative active core-shell material coating monolateral be in respectively wireline reel to two ends;
2) monolateral (being aluminium foil) of uncoated positive electrode active materials coating forms plus plate current-collecting body link 2 through cutting, ultrasonic bonding on the positive plate after will reeling again, monolateral (Copper Foil) of uncoated negative active core-shell material coating on the negative plate after reeling formed negative current collector link 3 through cutting, energy storage electric resistance welding, obtain square electric cell 1;
Square electric cell 1 is 206mm along the axial maximum length H that reels, and the width W of square electric cell is 49mm, and the thickness T of square electric cell is 9.2mm.The axial length m that the plus plate current-collecting body link is reeled along square electric cell is 10mm, the width R of plus plate current-collecting body link is 15mm, the axial length n that the negative current collector link is reeled along square electric cell is 10mm, and the width S of negative current collector link is 15mm;
3) square electric cell 1 is 20, with 20 square electric cells, 1 tight layered arrangement, namely stack up and down successively compression, plus plate current-collecting body link 2 on each square electric cell 1 is welded on the positive pole sheet 4(aluminium strip that confluxes, width 20mm, thickness 1.2mm) on, negative current collector link 3 on each square electric cell 1 is welded on the negative pole sheet 5(copper strips that confluxes, width 20mm, thickness 0.5mm) on, sheet 4 and the negative pole sheet 5 that confluxes that again positive pole confluxed is welded on respectively on the positive terminal and negative terminal of surveying in the Aluminum Alloy Cover, put into the square Al-alloy casing that is of a size of 54mm * 196mm * 206mm, conflux sheet 4 and negative pole of positive pole confluxes and places the polyethylene insulation sheet between sheet 5 and square aluminum alloy inner walls, Aluminum Alloy Cover and square Al-alloy casing laser welding, injection LiPF
6Electrolyte is [with volume ratio 1:1 diethyl carbonate (DEC) and ethylene carbonate (EC) as solvent, with LiPF
6Be dissolved in the solvent, make electrolyte, LiPF in the electrolyte
6Concentration be 1mol/L] after make the square lithium ion power battery that design capacity is 200Ah.
The utility model square lithium ion power battery through in 25 ± 2 ℃ of environment with 0.1C(5A) be charged to 3.65V, shelve 10min, 0.1C after being discharged to 2.5V and changing into, iterative cycles is measured the charge-discharge performance of the utility model square lithium ion power battery and the variation of cyclical stability.
Square lithium ion power battery the performance test results to embodiment 1 ~ 4 preparation is summarized as follows:
1, specific power is high, and high-rate discharge ability is excellent.The quality that adopts embodiment 1, embodiment 2, embodiment 3 and embodiment 4 square lithium ion power batteries than power density be respectively 〉=1000W/Kg, 〉=800W/Kg, 〉=700W/Kg and 〉=600W/Kg, can respectively continous-stable discharge under 10C, 8C, 6C and 5C.
2, energy density is high, and cycle life is good.The square lithium ion power battery specific energy density of the utility model embodiment 1, embodiment 2, embodiment 3 and embodiment 4 is respectively 108Wh/Kg, 112Wh/Kg and 121Wh/Kg and 126Wh/Kg.Cycle charge-discharge under the 1C condition (be charged to 3.65V, shelve 10min, be discharged to 2.5V), the cycle life of the lithium ion battery of embodiment 1, embodiment 2, embodiment 3 and embodiment 4 reach more than 1500 times (Capacitance reserve initial capacity 80%).Table 1 is embodiment 1, embodiment 2, embodiment 3 and the embodiment 4 lithium ion batteries capability retention under 1C charge and discharge cycles condition (100% discharges and recharges degree DOD).
Table 1
| Cycle-index | 100 | 300 | 500 | 1000 | 1500 | 2000 |
| |
98.8% | 97.4% | 95.7% | 91.9% | 87.5% | 83.6 |
| Embodiment | ||||||
| 2 | 98.9% | 97.3% | 95.5% | 91.2% | 87.5% | 83.2 |
| Embodiment | ||||||
| 3 | 99.1% | 97.3% | 95.4% | 91.1% | 86.6% | 82.3 |
| Embodiment | ||||||
| 4 | 98.7% | 97.1% | 95.2% | 90.8% | 86.2% | 81.9% |
3, security reliability is high.The utility model embodiment 1, embodiment 2, embodiment 3 and embodiment 4 square lithium ion power batteries are through 7G acceleration and different frequency vibration, and without short circuit phenomenon, internal resistance of cell excursion is between ± 3%.Charging (charging voltage is to 5V) test is without blast, leakage and phenomenon on fire; Square lithium ion power battery is through acupuncture and the blast of extruding nothing and phenomenon on fire; Square lithium ion power battery through 70 ℃ of heating and 130 ℃ of thermal shock tests without blast, leakage and phenomenon on fire.
Large capacity rectangular lithium ion battery high-rate discharge ability of the present utility model is excellent, stable cycle performance, and long service life can be applicable to the field of vehicles such as pure electric automobile, electric ship.
Claims (8)
1. square lithium ion power battery, comprise with the square shell of positive terminal and negative terminal and several square electric cells that place described square shell inner lamination to arrange, described square electric cell is by positive plate, barrier film and negative plate are wound into square forming, described positive plate comprises plus plate current-collecting body and the positive electrode active materials coating that is coated on the plus plate current-collecting body, described negative plate comprises negative current collector and the negative active core-shell material coating that is coated on the negative current collector, it is characterized in that, the axial end of square electric cell that described plus plate current-collecting body forms from reeling stretches out and cuts welding and forms the plus plate current-collecting body link, the axial other end of square electric cell that described negative current collector forms from reeling stretches out and cuts welding and forms the negative current collector link, plus plate current-collecting body link on described several square electric cells links to each other with described positive terminal by the positive pole sheet that confluxes, and the negative current collector link on described several square electric cells links to each other with described negative terminal by the negative pole sheet that confluxes.
2. square lithium ion power battery according to claim 1, it is characterized in that, the number of plies that described positive plate, barrier film and negative plate are reeled is at least two-layer, and described plus plate current-collecting body link all links to each other with all layers positive plate, and described negative current collector link all links to each other with all layers negative plate.
3. square lithium ion power battery according to claim 1 is characterized in that, described square electric cell is 8 ~ 20.
4. square lithium ion power battery according to claim 1 is characterized in that, described square electric cell is 112 ~ 212mm along the axial maximum length of reeling, and the width of described square electric cell is 40 ~ 60mm, and the thickness of described square electric cell is 8 ~ 10mm;
The axial length that described plus plate current-collecting body link is reeled along square electric cell is 8 ~ 12mm, and the width of described plus plate current-collecting body link is 8 ~ 20mm;
The axial length that described negative current collector link is reeled along square electric cell is 8 ~ 12mm, and the width of described negative current collector link is 8 ~ 20mm.
5. square lithium ion power battery according to claim 1 is characterized in that, the conflux width 12 ~ 30mm of sheet of described positive pole, thickness 0.6 ~ 1.2mm;
The conflux width 12 ~ 30mm of sheet of described negative pole, thickness 0.3 ~ 0.5mm.
6. square lithium ion power battery according to claim 1, it is characterized in that, described square shell with positive terminal and negative terminal comprises square Al-alloy casing and with the Aluminum Alloy Cover of positive terminal and negative terminal, described square Al-alloy casing is of a size of (43 ~ 63) mm * (98 ~ 286) mm * (108 ~ 206) mm.
7. square lithium ion power battery according to claim 1 is characterized in that, described plus plate current-collecting body is aluminium foil, and described negative current collector is Copper Foil, and the described positive pole sheet that confluxes is aluminium strip, and described negative current collector is copper strips.
8. square lithium ion power battery according to claim 1 is characterized in that, the conflux sheet welding of the plus plate current-collecting body link on described several square electric cells and described positive pole, and described positive pole confluxes sheet with the welding of described positive terminal or rivets;
The conflux sheet welding of negative current collector link on described several square electric cells and described negative pole, described negative pole confluxes sheet with the welding of described negative terminal or rivets.
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| CN201220434489XU CN202797166U (en) | 2012-08-29 | 2012-08-29 | Square lithium ion power battery |
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|---|---|---|---|
| CN201220434489XU CN202797166U (en) | 2012-08-29 | 2012-08-29 | Square lithium ion power battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895762A (en) * | 2017-11-24 | 2018-04-10 | 杭州天丰电源股份有限公司 | A kind of lithium ion battery |
| CN108598597A (en) * | 2018-04-02 | 2018-09-28 | 范能文 | Power battery production method and power battery |
| CN115207519A (en) * | 2022-09-15 | 2022-10-18 | 上海汽车集团股份有限公司 | Vehicle power battery and vehicle power battery pack |
-
2012
- 2012-08-29 CN CN201220434489XU patent/CN202797166U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895762A (en) * | 2017-11-24 | 2018-04-10 | 杭州天丰电源股份有限公司 | A kind of lithium ion battery |
| CN107895762B (en) * | 2017-11-24 | 2020-03-03 | 杭州天丰电源股份有限公司 | Lithium ion battery |
| CN108598597A (en) * | 2018-04-02 | 2018-09-28 | 范能文 | Power battery production method and power battery |
| CN115207519A (en) * | 2022-09-15 | 2022-10-18 | 上海汽车集团股份有限公司 | Vehicle power battery and vehicle power battery pack |
| CN115207519B (en) * | 2022-09-15 | 2022-11-22 | 上海汽车集团股份有限公司 | Vehicle power battery and vehicle power battery pack |
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