Summary of the invention:
The purpose of this utility model is to provide a kind of cylindrical vast capacity lithium ion battery.
Cylindrical monomer 400Ah lithium ion battery comprises:
Cylindrical cell external case 1, battery mandrel 3, lug 4, binding post 6, positive and negative electrode end cap 11, anode pole piece, cathode pole piece, as the aluminium foil of collector, described binding post 6 is fixedly connected with at axis direction with battery mandrel 3, also comprises:
Bracing frame 5, slip ring 7, lug binding nut 8, insulation cushion 9, O type circle 10, binding post locking nut 12, dog screw 13.
As preferred version, described aluminum foil thickness is 30 ± 2 μ m, and width is 320 ± 1mm, and anode pole piece, cathode pole piece length are 33.81m; Described lug specification is: long 70 ± 1mm, and wide is 10 ± 0.1mm, thick is 0.15 ± 0.015mm.
As further preferred version, respectively be provided with 3 safe valve blocks on the positive and negative electrode end cap, its diameter is 13mm, and thickness is 0.5mm, and burst pressure is 7.5-8kg; Cylindrical cell external case 1 diameter is 134mm, and length is 450mm, and wall thickness is 1mm;
Annexation is: respectively weld 100 aluminium pole ears in positive and negative electrode pole piece edge-light paper tinsel position, and with high tempreture tape by lug root firm pasting; To divide equally the space that positive and negative electrode lug 4 in groups passes between binding post 6 and slip ring 7, and fix to clamp with lug binding nut 8, battery core is packed in cylindrical cell external case 1, respectively at battery case two ends cover upper support frame 5, after the bracing frame assembling finishes, in order binding post 6, O type circle 10, insulation cushion 9, positive and negative electrode end cap 11 are linked together respectively, fixing with binding post locking nut 12 and dog screw 13.
The utility model is with respect to the advantage of prior art:
(1) column lithium ion battery that the utility model is prepared, more than the monomer capacity reaches 400Ah, is the battery of the cylindrical maximum monomer capacity developed of having appeared in the newspapers on lithium ion battery market at present both at home and abroad.
(2) result of the column lithium ion battery acupuncture that prepared by the utility model experiment shows, battery does not burn, do not explode, only 34 ℃ of battery surface temperature.The fail safe of battery significantly is improved.
(3) the utility model has designed novel cylindrical shape, practical, and anti-corrosion, withstand voltage, shock resistance, vibration resistance are strong, and cost is low, and the cell capacity is large, and inside battery is rational in infrastructure, has greatly improved the thermal diffusivity of battery, thermal stability and fail safe.
(4), in preferred version, 3 safe valve blocks have been laid respectively dexterously on the end cap at battery two ends; Adopted unique " wiring cuff structure " on the connected mode of battery and binding post, these designs have significantly reduced the internal resistance of battery, have improved the security reliability of battery.
(5) the utility model technological process is simple, is applicable to being applied to industrial-scale production.
Embodiment:
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further details the present invention in order further more clearly to illustrate.
Embodiment 1:
Cylindrical monomer 400Ah lithium ion battery comprises:
Cylindrical cell external case 1, battery mandrel 3, lug 4, binding post 6, positive and negative electrode end cap 11, anode pole piece, cathode pole piece, as the aluminium foil of collector, described binding post 6 is fixedly connected with at axis direction with battery mandrel 3, also comprises:
Bracing frame 5, slip ring 7, lug binding nut 8, insulation cushion 9, O type circle 10, binding post locking nut 12, dog screw 13.
As preferred version, described aluminum foil thickness is 30 ± 2 μ m, and width is 320 ± 1mm, and anode pole piece, cathode pole piece length are 33.81m; Described lug specification is: long 70 ± 1mm, and wide is 10 ± 0.1mm, thick is 0.15 ± 0.015mm.
As further preferred version, respectively be provided with 3 safe valve blocks on the positive and negative electrode end cap, its diameter is 13mm, and thickness is 0.5mm, and burst pressure is 7.5-8kg; Cylindrical cell external case 1 diameter is 134mm, and length is 450mm, and wall thickness is 1mm;
Annexation is: respectively weld 100 aluminium pole ears in positive and negative electrode pole piece edge-light paper tinsel position, and with high tempreture tape by lug root firm pasting; To divide equally the space that positive and negative electrode lug 4 in groups passes between binding post 6 and slip ring 7, and fix to clamp with lug binding nut 8, battery core is packed in cylindrical cell external case 1, respectively at battery case two ends cover upper support frame 5, after the bracing frame assembling finishes, in order binding post 6, O type circle 10, insulation cushion 9, positive and negative electrode end cap 11 are linked together respectively, fixing with binding post locking nut 12 and dog screw 13.
Manufacture the method for above-mentioned cylindrical monomer 400Ah lithium ion battery, process is as follows:
(1) preparation of electrode
Prior baked raw material LiFePO4, conductive black, graphite, binding agent PVDF, solvent NMP fully is uniformly mixed according to the ratio of mass percent 42.0-43.0:1.3-1.7:0.8-1.2:2.5-3.5:51.0-53.0, makes battery anode slurry; Prior baked raw material lithium titanate, conductive black, graphite, binding agent PVDF, solvent NMP fully is uniformly mixed according to the ratio of mass percent 49.0-50.0:0.8-1.2:0.8-1.2:3.0-4.0:44.0-46.0, makes battery cathode slurry;
In coating and roll-in process, positive and negative electrode all adopts aluminium foil as collector, and aluminum foil thickness is 30 ± 2 μ m, and width is 320 ± 1mm, and the positive and negative electrode pole piece length is 33.81m;
(2) assembling of battery
100 ℃ of baking 48h of the pole piece that top step is made, again by positive and negative electrode pole piece and barrier film parallel aligned, be positioned on automatic winding-machine, respectively weld 100 aluminium pole ears in positive and negative electrode pole piece edge-light paper tinsel position, and with high tempreture tape by lug root firm pasting, positive and negative electrode aluminium pole ears specification is: long 70 ± 1mm, and wide is 10 ± 0.1mm, thick is 0.15 ± 0.015mm;
To divide equally the space that positive and negative electrode lug 4 in groups passes between binding post 6 and slip ring 7, and fix to clamp with lug binding nut 8, this connected mode is called " wiring cuff structure "; In the cylindrical cell external case 1 of carefully battery core being packed into; At battery case two ends cover upper support frame 5, after the bracing frame assembling finishes, in order binding post 6, O type circle 10, insulation cushion 9, positive and negative electrode end cap 11 are linked together respectively respectively, fixing with binding post locking nut 12 and dog screw 13; Respectively be provided with 3 safe valve blocks on the positive and negative electrode end cap, its diameter is 13mm, and thickness is 0.5mm, and burst pressure is 7.5-8kg, in coiling, assembling and welding process, carry out short-circuit testing with universal instrument, adopts vacuum liquid filling to carry out fluid injection, and electrolyte is LiPF
6(EC+PC+DMC+DEC), finally with laser welder, the end cap seal at battery two ends is burn-on.
The parameters of product is as follows:
Battery case: stainless steel; Diameter: 134mm; Length: 450mm; Weight: 12kg; Rated capacity: 400Ah; Rated operational voltage 1.8V; Internal resistance: 0.33m Ω; Service life cycle: more than 8000 times.
The cylindrical monomer 400Ah LiFePO of embodiment 1 preparation
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12as shown in Figure 2, its overall dimension schematic diagram as shown in Figure 3 for the product photo of lithium ion battery.
The BTS-5V200A battery detection equipment that adopts Shenzhen new Weir Electronics Co., Ltd. to produce, to the cylindrical monomer 400Ah LiFePO of embodiment 1 preparation
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12lithium ion battery carries out the constant current charge-discharge performance test.According to " used for electric vehicle lithium-ions battery " the automobile industry standard QC/T743-2006 of the People's Republic of China (PRC), charging process is constant voltage charge after first constant current charge, and the charging deboost is 2.3V; Discharge process is constant-current discharge, and discharge cut-off voltage is 0.5V, adopts the electric current of 0.33C to carry out charge-discharge test.
The cylindrical monomer 400Ah LiFePO of embodiment 1 preparation
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12lithium ion battery, weight is 12kg, and discharge capacity is 417.718Ah, and efficiency for charge-discharge is 99.6%, and the internal resistance of battery is 0.33m Ω, cycle life can reach (theory is calculated as 20000 times) more than 8000 times by the most conservative estimation.
From accompanying drawing 4, can find out, the charging/discharging voltage of battery is very steady, and the plateau potential retention time is grown (the platform capacity reaches 95% left and right of discharge capacity), and this is to have spinel-type Li
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12with rock salt Li
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12the feature of two phase reaction.The change of two-phase makes this electrode potential held stationary.When the two-phase transformation completes substantially, the hop of fast rise or decline just occurs in its current potential.Discharge and recharge the obvious voltage jump phenomenon produced while finishing and can be used for indicating termination to discharge and recharge, be convenient to the detection of battery capacity.
The cylindrical monomer 400Ah LiFePO of embodiment 1 preparation
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12the internal resistance of lithium ion battery is only 0.33m Ω, and conductivity is very good.High capacity cell pole piece cross-sectional area is also larger, therefore the internal resistance of cell less (resistance and cross-sectional area are inversely proportional to).The battery that adopts this technology to prepare is compared with the battery that adopts lamination techniques to prepare,, under the effect of tension force, make between positive and negative plate and barrier film and combine closely in winding process due to the pole piece of battery, volume core consolidation and cross-sectional area are large, and this makes the internal resistance of battery extremely small.
In the scope of experiment of the embodiment of the present invention 1, cylindrical LiFePO
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12the capacity of lithium ion battery has no decay, according to Li
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12the characteristics of material and the early stage small-capacity cells data-speculative, the cylindrical LiFePO of this 400Ah
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12the cycle life of lithium ion battery can reach (theory is calculated as 20000 times) more than 8000 times by the most conservative estimation, is 2-4 times of general lithium ion battery life-span on market, current home and abroad.
The cylindrical monomer 400Ah LiFePO of embodiment 1 preparation
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12lithium ion battery, its internal resistance, cycle life and other the key technical indexes have all completed the designing requirement of expection.
Cylindrical monomer 400Ah LiFePO to embodiment 1 preparation
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12lithium ion battery, according to " used for electric vehicle lithium-ions battery " the automobile industry standard QC/T743-2006 of the People's Republic of China (PRC), carry out the acupuncture experiment, and battery does not burn, do not explode; 6 safe valve blocks on the end cap of battery two ends all are not opened; The battery surface temperature only has 34 ℃.And conventional LiFePO in the market
4/ C battery acupuncture experiment, the battery surface temperature is 200 ℃, the fail safe of battery significantly is improved.
In sum, the prepared cylindrical monomer 400Ah LiFePO of the embodiment of the present invention 1
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12capacity of lithium ion battery is large, internal resistance is little, have extended cycle life, security reliability is good, environmental suitability is strong, consistency of performance is good, can be widely used in electric automobile, hybrid vehicle, military equipment, space flight and aviation, waterpower, firepower, wind-force, solar power station storage power-supply system, and on the uninterrupted power supply of post and telecommunications, thereby met the growing market demand, there is vast potential for future development.
The development and application green energy resource is historical inevitable choice.High power capacity, high-power, safe and reliable cylindrical lithium-ion power battery, will be at home, occupy critical role on outer market, and tool has unlimited potential and application prospect.