CN100505379C - Lithium ion battery and method for manufacturing the same - Google Patents
Lithium ion battery and method for manufacturing the same Download PDFInfo
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- CN100505379C CN100505379C CNB2005101352545A CN200510135254A CN100505379C CN 100505379 C CN100505379 C CN 100505379C CN B2005101352545 A CNB2005101352545 A CN B2005101352545A CN 200510135254 A CN200510135254 A CN 200510135254A CN 100505379 C CN100505379 C CN 100505379C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A lithium-ion battery includes the battery shell and the electrode group sealed in the battery shell and the electrolyte, the said battery shell including the cover board and the main-body; the said cover board includes the injection hole, and the metal bead embedded in the injection hole, in which between the said metal bead and the injection hole is seamless. Since there is seamless between the metal bead and the injection hole, the lithium-ion battery of the invention has good sealing, thereby avoiding the battery electrolyte loss caused by sealing un-tight, and the cyclic performance improves.
Description
Technical field
The invention relates to a kind of battery and preparation method thereof, especially about a kind of lithium ion battery and preparation method thereof.
Background technology
Lithium ion battery is a kind of novel chemical power source, and energy density is big, operating voltage is high, the life-span is long, the characteristics of no environment public hazards because of it has, and is widely used in the portable type electronic products such as mobile phone.
Lithium ion battery comprises battery container and the electrode group and the electrolyte that are sealed in this battery container.Described battery container comprises cover plate and main body; Comprise liquid injection hole on the described cover plate, prior art is embedded with the steel ball that radius is slightly larger than the liquid injection hole radius at the liquid injection hole place, reaches the purpose of sealed cell.The method of the above-mentioned sealing lithium ion battery of preparation is to adopt mechanical pressure to make steel ball be embedded in the liquid injection hole place at present.
Mechanical pressure is restive, can make steel ball embed cover plate and cross dark or shallow excessively; Even the position of steel ball is moderate, also there is the slit in the liquid injection hole place of cover plate; Above-mentioned situation all can make battery sealing-performance poor.Especially lithium ion battery is poorly sealed, and on the one hand, the electrolyte in the battery can leak, and the parts on the corrosion cell cover plate cause the loss of electrolyte, influences the performance (as cycle life etc.) of battery; On the other hand, extraneous air enters inside battery, with electrolyte and/or the electrode group generation gas that reacts, causes the battery thickening, and the interior resistive of battery is big, has a strong impact on every performance (as cycle performance, capacity etc.) of battery.
To sum up, existing lithium-ion battery sealing-performance is not good, cycle performance is poor, is badly in need of the lithium ion battery of a kind of good airproof performance, cycle performance difference.
Summary of the invention
The objective of the invention is to overcome the shortcoming that lithium-ion battery sealing-performance can differ from the prior art, a kind of lithium ion battery of good airproof performance is provided.
Second purpose of the present invention provides the preparation method of this lithium ion battery.
The present inventor is through discovering, adopt the added metal welding or make liquid injection hole and bead be fused into one, can make between liquid injection hole and the bead seamlessly, and then obtain the lithium ion battery of good airproof performance, improve the performance (as cycle performance, capacity etc.) of battery.The present inventor also considers accuracy height when the method for preparing the sealing battery must guarantee welding and fusing, and the high temperature action time is very short.
The invention provides a kind of lithium ion battery, this battery comprises battery container and the electrode group and the electrolyte that are sealed in this battery container, and described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, wherein, seamless between described bead and the liquid injection hole.
The present invention also provides the preparation method of above-mentioned lithium ion battery to comprise the electrode group has been contained in the battery container, inject electrolyte, bead is embedded in the battery container cover plate liquid injection hole, described battery comprises battery container and the electrode group and the electrolyte that are sealed in this battery container, and described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, wherein, after described liquid injection port place embeds bead, the slit between sealing metal pearl and the liquid injection hole.
According to the present invention, after the liquid injection hole place embeds bead, the slit between sealing metal pearl and the liquid injection hole, because it is seamless between bead and the liquid injection hole, thereby good airproof performance, and then avoided loss by the poorly sealed battery electrolyte that causes, so cycle performance is improved.
During as embodiment 1 preparation lithium ion battery, make bead embed liquid injection hole after, the slit between laser welded seal bead and the liquid injection hole, and comparative example 1 adopts conventional method to prepare lithium ion battery.Relatively every performance of two kinds of batteries as can be known: the former leakage rate is 0.002%, and the latter reaches 0.012%; The former reaches 4.6 MPas withstand voltage, and the latter only is 3.8 MPas; Behind the cycle charge-discharge 500 times, method of scoring survey battery circulation back varied in thickness the former 0.49 millimeter, 0.81 millimeter of the latter, the two capacitance conservation rate relatively, the former 81.45%, the latter 63.54%, comprehensive two indexs as can be known, the former cycle performance is better than the latter greatly.
Description of drawings
Fig. 1 is the battery outside drawing;
Fig. 2 is a comparative example battery cover board profile;
Fig. 3 is a comparative example battery cover board vertical view;
Fig. 4 is a battery cover board profile of the present invention;
Fig. 5 is a battery cover board vertical view of the present invention;
Fig. 6 is a laser solder joint schematic diagram;
The graph of a relation of Fig. 7 battery capacity conservation rate and cycle-index;
Fig. 8 is the thickness of battery in the loop test process and the graph of a relation of cycle-index.
Among the figure
1---cover plate 2---side 3---base
4---top measurement point 5---middle part measurement point 6---bottom measurement points
7---liquid injection hole 8---bead
9---the slit between liquid injection hole and the bead
10---the welding region (black is represented) between liquid injection hole and the bead
11---the laser solder joint
12---the intersection of two laser solder joints
Embodiment
Lithium ion battery provided by the invention comprises battery container and the electrode group and the electrolyte that are sealed in this battery container, and described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, wherein, seamless between described bead and the liquid injection hole.
Promptly finish the sealing of battery behind the prior art liquid injection hole place embedding bead, in fact still there is the slit in the liquid injection hole place of battery cover board, influences the sealing of battery; Steel ball embeds cover plate and dark or shallow excessively situation may occur and also can make battery sealing-performance poor in addition.Loss by the poorly sealed battery electrolyte that causes because seamless between bead and the liquid injection hole, thereby the good airproof performance of battery, and then is avoided in slit between sealing metal pearl and the liquid injection hole, prevents the decline of battery performance.
Anyly can fill firmly that the material of bead and liquid injection hole slit can both reach goal of the invention of the present invention on the battery cover board.Because battery cover board and bead all are metal materials, the slit between preferred described bead and the liquid injection hole is by metal filled.The metal that adds can be identical with the used material of battery cover board and bead, also can be different, and preferred identical materials can combine tightr with bead and liquid injection hole.The edge that preferred plane, the bead of metal material on the battery cap surface of filling is exposed at the peak on battery cap surface and liquid injection hole in one plane.The metal that described added metal is can be for fusing point commonly used lower such as aluminium, tin etc. are added metal not more preferably, slit around direct deposite metal pearl and the liquid injection hole slit, bead and liquid injection hole are structure as a whole, and the former fluid injection bore region of the battery cover board after most preferably dissolving becomes the plane integrative-structure.
Because bead need embed in the liquid injection hole, so the radius of bead must be greater than the radius of liquid injection hole, bead radius of the present invention and liquid injection hole semidiameter are the 0.05-0.3 millimeter, preferred 0.1-0.2 millimeter.It is strong to have hardness, corrosion-resistant, and the metal that chemical property is stable can prepare bead of the present invention.Bead of the present invention is steel ball, the pill of aluminium or copper pearl etc.The metal for preparing described battery container cover plate can be usually used in preparing the various metals of battery container for this area, is preferably aluminium or steel.
Because the present invention only relates to the improvement that the prior art lithium ion battery is sealed, therefore other The Nomenclature Composition and Structure of Complexes to lithium ion battery has no particular limits.Lithium ion battery comprises electrode group and electrolyte, and described electrode group and electrolyte are sealed in the battery container, and described electrode group comprises positive pole, negative pole and the barrier film between positive pole and negative pole.
For example, described collector can be a various collector known in those skilled in the art, and as aluminium foil, Copper Foil, nickel plated steel strip etc., the present invention selects for use aluminium foil to make collector.
Described positive electrode can be a various positive electrode known in those skilled in the art, generally includes the conductive agent that positive active material, adhesive and selectivity contain, and described positive active material can be selected from the positive active material of lithium secondary battery routine, as Li
xNi
1-yCoO
2(wherein, 0.9≤x≤1.1,0≤y≤1.0), Li
mMn
2-nB
nO
2(wherein, B is a transition metal, 0.9≤m≤1.1,0≤n≤1.0), Li
1+aM
bMn
2-bO
4(wherein ,-0.1≤a≤0.2,0≤b≤1.0, M is one or more in lithium, boron, magnesium, aluminium, titanium, chromium, iron, cobalt, nickel, copper, zinc, gallium, yttrium, fluorine, iodine, the element sulphur).Preferred described positive active material is one or more of lithium-nickel-cobalt-oxygen thing, lithium and cobalt oxides or lithium manganese oxide.
Positive electrode of the present invention has no particular limits adhesive, can adopt known in the art all can be used for the adhesive of lithium secondary battery.Preferred described adhesive is the mixture of hydrophobicity adhesive and hydrophilic adhesive.The ratio of described hydrophobicity adhesive and hydrophilic adhesive has no particular limits, and can determine according to actual needs, and for example, the part by weight of hydrophilic adhesive and hydrophobicity adhesive can be 0.3:1-1:1.Described adhesive can use with the aqueous solution or emulsion form, also can use with solid form, preferably use with the aqueous solution or emulsion form, have no particular limits the concentration of described hydrophilic adhesive solution and the concentration of described hydrophobicity adhesive agent emulsion this moment, the viscosity that can be coated with according to the slurry of positive pole that will prepare and cathode size and the requirement of operability are adjusted flexibly to this concentration, the concentration of for example described hydrophilic adhesive solution can be 0.5-4 weight %, and the concentration of described hydrophobicity adhesive agent emulsion can be 10-80 weight %.Described hydrophobicity adhesive can be polytetrafluoroethylene, butadiene-styrene rubber or their mixture.Described hydrophilic adhesive can be hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol or their mixture.In described adhesive preferably polyethylene alcohol, polytetrafluoroethylene, CMC and the butadiene-styrene rubber one or more.The content of described adhesive is the 0.01-8 weight % of positive active material, is preferably 1-5 weight %.
Positive electrode provided by the invention can also optionally contain the common conductive agent that contains in the prior art positive electrode.Because conductive agent is used to increase the conductivity of electrode, reduce the internal resistance of battery, so the present invention preferably contains conductive agent.Described conductive agent can be selected from one or more in conductive carbon black, acetylene black, nickel powder, copper powder and the electrically conductive graphite.The content of described conductive agent and kind are conventionally known to one of skill in the art, for example, are benchmark with the positive electrode, and the content of conductive agent is generally 0-15 weight %, is preferably 0-10 weight %.
Consisting of of negative pole is conventionally known to one of skill in the art, and in general, negative pole comprises conducting base and coating and/or is filled in negative material on the conducting base.Described conducting base is conventionally known to one of skill in the art, for example can be selected from aluminium foil, Copper Foil, nickel plated steel strip, the Punching steel strip one or more.Described negative active core-shell material is conventionally known to one of skill in the art, it comprises negative electrode active material and adhesive, described negative electrode active material can be selected from the negative electrode active material of lithium secondary battery routine, as in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal, the silicon alloy one or more.Described adhesive can be selected from the adhesive of lithium secondary battery routine, as in polyvinyl alcohol, polytetrafluoroethylene, CMC (CMC), the butadiene-styrene rubber (SBR) one or more.In general, the content of described adhesive is the 0.5-8 weight % of negative electrode active material, is preferably 2-5 weight %.
The solvent that is used to prepare anode sizing agent and cathode size of the present invention can be selected from conventional solvent, as being selected from N-methyl pyrrolidone (NMP), N, dinethylformamide (DMF), N, one or more in N-diethylformamide (DEF), methyl-sulfoxide (DMSO), oxolane (THF) and water and the alcohols.The consumption of solvent can be coated on the described collector described slurry and gets final product.In general, the consumption of solvent is that to make the concentration of positive active material in the slurries be 40-90 weight %, is preferably 50-85 weight %.
Described barrier film has electrical insulation capability and liquid retainability energy, is arranged between positive pole and the negative pole, and is sealed in the battery case with positive pole, negative pole and electrolyte.Described barrier film can be the general various barrier films in this area, such as by those skilled in the art in the modified poly ethylene felt of respectively producing the trade mark, modified polypropene felt, ultra-fine fibre glass felt, vinylon felt or the nylon felt of known each manufacturer production and wettability microporous polyolefin film through welding or the bonding composite membrane that forms.
Described electrolyte is this area electrolyte commonly used, as the mixed solution of electrolyte lithium salt and nonaqueous solvents.Electrolyte lithium salt is selected from lithium hexafluoro phosphate (LiPF
6), in lithium perchlorate, LiBF4, hexafluoroarsenate lithium, lithium halide, chlorine lithium aluminate and the fluorocarbon based sulfonic acid lithium one or more.Organic solvent can be selected from chain acid esters and ring-type acid esters mixed solution, wherein the chain acid esters can be fluorine-containing for dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other, sulfur-bearing or contain at least a in the chain organosilane ester of unsaturated bond.The ring-type acid esters can (γ-BL), sultone and other be fluorine-containing, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond for ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton.In the described electrolyte, the concentration of electrolyte lithium salt is generally the 0.1-2 mol, is preferably the 0.8-1.2 mol.
The preparation method of lithium ion battery provided by the invention comprises the electrode group is contained in the battery container, injects electrolyte, and bead is embedded in the battery container cover plate liquid injection hole, and described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, wherein, after described liquid injection port place embeds bead, the slit between sealing metal pearl and the liquid injection hole.
The method in the slit between described sealing metal pearl and the liquid injection hole can be the accuracy height and the short various welding methods of high temperature action time that can guarantee welding and fusing well known in the art.The method of described sealing is selected from one or more in laser welding, electron beam welding and the plasma arc welding (PAW).More preferably laser welding, need not added metal, can be by laser welding apparatus such as laser welder, accurately regulate the density of laser energy and laser walking speed control solder joint and the molten bath size (as shown in Figure 6) of solder joint, directly the metal of fusing liquid injection hole and both sides, bead slit makes the two become the integrative-structure of sealing.The condition of laser welding all melts the metal of liquid injection hole and bead both sides and gets final product, the condition of described laser welding is different because of the model of laser-beam welding machine and kind, those skilled in the art can determine the condition of described laser welding according to the fusing point of the metal material of the specification of laser-beam welding machine and battery cover board liquid injection hole and bead.The solder joint scope of described laser welding is a center of circle annular section for the center of circle with liquid injection hole, described annular section inside radius is less than the liquid injection hole radius, with the difference in fluid injection aperture be the 0.01-0.1 millimeter, outer radius is less than the bead radius, with the difference of bead radius be the 0.01-0.5 millimeter.
The present invention is described further below in conjunction with embodiment.
The present embodiment explanation the invention provides lithium secondary battery and preparation method thereof.
(1) Zheng Ji preparation
(Atuofeina Corp 761#PVDF) is dissolved in 1350 gram N-N-methyl-2-2-pyrrolidone N-(NMP) solvents and makes binder solution, the 2895 gram LiCoO that will mix in advance then with 90 gram polyvinylidene fluoride
2Join in the above-mentioned solution with 90 gram acetylene black powder, fully mix and make anode sizing agent; With tensile pulp machine this anode sizing agent is coated to thick 20 microns aluminium foil two sides at interval, through 120 ℃ of vacuum and heating dryings 1 hour, roll-in, cut-parts make the positive pole of millimeter (wide) * 125,550 millimeters (length) * 43.8 micron (thick), contain 6.4 LiCoO that restrain on the every positive pole
2
(2) preparation of negative pole
With 30 gram CMC (CMC) (Jiangmen quantum Gao Ke company commodity, model is CMC1500) and 75 gram butadiene-styrene rubber (SBR) latex (Nantong Shen Hua chemical company commodity, the trade mark is TAIPOL1500E) be dissolved in the 1875 gram water, stir and make binder solution, with 1395 gram graphite (SODIFF company commodity, the trade mark is DAG84) join in this binder solution, mix and make cathode size, evenly be applied to 12 microns Copper Foil two sides with tensile pulp machine, through 120 ℃ of vacuum and heating dryings 1 hour, roll-in, cut-parts make the negative pole of millimeter (wide) * 125,515 millimeters (length) * 44.5 micron (thick), contain the graphite that 3.8-4.1 restrains on the every negative pole.
(3) preparation of electrolyte
With LiPF
6Be configured to LiPF with ethylene carbonate (EC) and dimethyl carbonate (DMC)
6Concentration is the solution (volume ratio of EC/DMC is 1:1) of 1 mol, obtains electrolyte.
(4) assembling of battery
The positive pole that above-mentioned (1) is obtained, the negative pole that (2) obtain are wound into the electrode group of a square lithium secondary battery with 25 microns polypropylene diaphragms, and this electrode group included in 4 millimeters * 34 millimeters * 50 millimeters the rectangular cell aluminum hull, inject about 2.8 milliliters of the electrolyte that above-mentioned (3) obtain, liquid injection hole is knocked in steel ball and is sealed, wherein the liquid injection hole radius is 0.5 millimeter, and the radius of steel ball is 0.55 millimeter.With alcohol cleaning liquid injection hole place's cover plate and steel ball, with battery in place, with laser-beam welding machine light on steel ball, the laser walking speed is 400 mm/min then, and weldingvoltage is 300 volts.The solder joint scope of described laser welding is a center of circle annular section for the center of circle with liquid injection hole, and described annular section inside radius is 0.7 millimeter, and outer radius is 0.9 millimeter.
The present embodiment explanation the invention provides lithium secondary battery and preparation method thereof.
Method according to embodiment 1 prepares electrolysis additive and lithium ion battery, and different is that the laser walking speed is 400 mm/min, and weldingvoltage is 300 volts.The solder joint scope of described laser welding is a center of circle annular section for the center of circle with liquid injection hole, and described annular section inside radius is 0.7 millimeter, and outer radius is 1.2 millimeters.
The present embodiment explanation the invention provides lithium secondary battery and preparation method thereof.
Method according to embodiment 1 prepares electrolysis additive and lithium ion battery, and different is that the laser walking speed is 400 mm/min, and weldingvoltage is 300 volts.The solder joint scope of described laser welding is a center of circle annular section for the center of circle with liquid injection hole, and described annular section inside radius is 0.7 millimeter, and outer radius is 1.5 millimeters.
Comparative example 1
This comparative example explanation prior art lithium ion battery and preparation method thereof.
Method according to embodiment 1 prepares electrolysis additive and lithium ion battery, the different sealings of just promptly finishing battery after the liquid injection hole place knocks in steel ball.
Battery performance test:
(1) leakage rate test:
With the battery that embodiment 1-3 and comparative example 1 are prepared, placing vacuum degree is the environment of 0.05 MPa after 2 hours, and with pH test paper wiping battery surface, if the phenomenon of leakage, i.e. test paper variable color is considered as leakage.Every kind of battery testing 1000 examples.Test result sees Table 1.
Table 1
| | Embodiment | 1 | |
|
Comparative example 1 |
| Leakage rate (%) | 0.002 | 0.001 | 0.001 | 0.012 |
As can be seen from Table 1, battery leakage rate provided by the invention is significantly less than the battery of comparative example 1, illustrates that battery of the present invention can prevent the leakage of battery electrolyte effectively.
(2) withstand voltage test:
Do not have the empty battery container of hold electrodes group and electrolyte according to the sealing of the method for embodiment 1-3 and comparative example 1, open pore in the battery container bottom, with 1.5 MPa air pressure to wherein filling air, and the force value during with the pressure release of Pressure gauge record battery, i.e. withstand voltage.Every kind of battery testing 100 examples.Test result sees Table 2.
Table 2
| | Embodiment | 1 | |
|
Comparative example 1 |
| Withstand voltage (MPa) | 4.6 | 4.9 | 5.1 | 3.8 |
As can be seen from Table 2, battery withstand voltage provided by the invention is much higher than the battery of comparative example 1, illustrates that battery energy anti-pressure ability of the present invention is strong.
(3) cycle performance test
Battery with embodiment 1-3 and comparative example 1 are prepared changes into the activation electrical property, and the cell voltage after changing into is not less than 3.85 volts.To the battery capacity of embodiment 1-3 and comparative example 1 preparation, under normal temperature, relative humidity 25-85% environmental condition, measure then.Assay method is as follows:
At first, as shown in Figure 1, test top measurement point (4), middle part measurement point (5) and bottom measurement point (6) thickness of the battery sample after changing into respectively with vernier caliper.Wherein, described top measurement point is apart from (1) 5 millimeter of cover plate, apart from (2) 17 millimeters of sides; Described middle part measurement point is apart from (1) 25 millimeter of cover plate, apart from (2) 17 millimeters of sides; (3) 5 millimeters apart from the base of described bottom measurement points are apart from (2) 17 millimeters of sides.Use BS-9300 (R) secondary cell device for detecting performance to test then, after the battery after changing into is lied prostrate with 1000 milliamperes of (1C) constant current charges to 4.2, with 4.2 volts of constant voltage charges, 100 milliamperes of charging initial currents, 20 milliamperes of charging cut-off currents.Be discharged to 3.0 volts with 1000 milliamperes then, measure the initial capacity that obtains battery discharge.Circulation repeats with 1000 milliamperes of (1C) constant current charge to 4.2 volts; Be discharged to 3.0 volts charge and discharge process with 1000 milliamperes (1C) again, write down the 10th, 30,60,100,150,200,250,350,400,450,500 time loop ends capacity, and be calculated as follows the battery capacity conservation rate: capability retention=loop ends capacity/initial capacity * 100%.In addition, after circulation 100 times, 300 times and 500 times, use the vernier caliper measurement cell thickness, and the counting cell varied in thickness: cell thickness (millimeter) before varied in thickness (millimeter)=circulation back cell thickness (millimeter)-circulation.
The capability retention measurement result is as shown in table 3.
Table 3
| Cycle- | Embodiment | 1 | |
|
Comparative example 1 |
| 10 | 97.88 | 98.18 | 98.01 | 96.2 | |
| 30 | 95.09 | 96.44 | 96.59 | 93.64 | |
| 60 | 94.01 | 95.33 | 95.85 | 90.91 | |
| 100 | 93.25 | 94.54 | 95.07 | 88.71 | |
| 150 | 91.94 | 93.06 | 93.86 | 85.18 | |
| 200 | 90.43 | 91.75 | 92.22 | 82.26 | |
| 250 | 89.01 | 90.83 | 90.64 | 79.82 | |
| 300 | 88.24 | 89.51 | 89.01 | 76.28 | |
| 350 | 86.33 | 87.62 | 87.22 | 73.53 | |
| 400 | 84.59 | 85.91 | 86.62 | 70.19 | |
| 450 | 82.53 | 83.13 | 85.91 | 66.04 | |
| 500 | 81.45 | 82.80 | 84.21 | 63.54 |
The cell thickness measurement result is as shown in table 4.
Table 4
From table 3, table 4 and Fig. 7, result shown in Figure 8 as can be seen: lithium ion battery cycle performance provided by the invention is better than the battery of comparative example 2 greatly, the battery of the technology of the present invention sealing, can effectively avoid the loss of electrolyte, thereby the cycle performance of battery is obviously improved, capacity still can remain on more than 80% after 500 circulations, and comparative example 1 only is 63.54% under the equal conditions; It also only is 60.5% of comparative example 1 that 500 circulation back cell thickness change.
Claims (9)
1. lithium ion battery, this battery comprise battery container and are sealed in electrode group and electrolyte in this battery container that described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, it is characterized in that, seamless between described bead and the liquid injection hole, and the edge of the peak of bead and liquid injection hole is in one plane.
2. battery according to claim 1, wherein, the slit between described bead and the liquid injection hole is by metal filled.
3. battery according to claim 1 and 2, wherein, described bead and liquid injection hole are structure as a whole.
4. battery according to claim 1, wherein, the bead radius is greater than the liquid injection hole radius, and described bead radius and liquid injection hole semidiameter are the 0.05-0.3 millimeter.
5. battery according to claim 1, wherein, described bead is steel ball, the pill of aluminium, copper pearl.
6. battery according to claim 1, wherein, described battery container cover plate is aluminium or steel.
7. the preparation method of the described lithium ion battery of claim 1, this method comprise the electrode group are contained in the battery container, inject electrolyte, and bead is embedded in the battery container cover plate liquid injection hole, and described battery container comprises cover plate and main body; Comprise liquid injection hole and the bead that is embedded in the liquid injection hole on the described cover plate, it is characterized in that, after described liquid injection port place embeds bead, the slit between sealing metal pearl and the liquid injection hole, and the edge of the peak of bead and liquid injection hole is in one plane.
8. method according to claim 7, wherein, the method for described sealing is selected from one or more in laser welding, electron beam welding and the plasma arc welding (PAW).
9. method according to claim 8, wherein, the solder joint scope of described laser welding is a center of circle annular section for the center of circle with liquid injection hole, described annular section inside radius is less than the liquid injection hole radius, with the difference in fluid injection aperture be the 0.01-0.1 millimeter, outer radius is less than the bead radius, with the difference of bead radius be the 0.01-0.5 millimeter.
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| CNB2005101352545A CN100505379C (en) | 2005-12-29 | 2005-12-29 | Lithium ion battery and method for manufacturing the same |
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