CN202905885U - Quadrate lithium ion battery having coiled structure - Google Patents
Quadrate lithium ion battery having coiled structure Download PDFInfo
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- CN202905885U CN202905885U CN2012201569745U CN201220156974U CN202905885U CN 202905885 U CN202905885 U CN 202905885U CN 2012201569745 U CN2012201569745 U CN 2012201569745U CN 201220156974 U CN201220156974 U CN 201220156974U CN 202905885 U CN202905885 U CN 202905885U
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Abstract
The utility model belongs to the technical field of lithium ion batteries and relates to a quadrate lithium ion battery having a coiled structure. The quadrate lithium ion battery comprises an anode, a cathode, a diaphragm and an electrolyte. The anode comprises an anode current collector and an anode material layer coated on the anode current collector. A ratio of the thickness of the anode material layer on corner areas of the anode to the thickness of the anode material layer on a main area of the anode is less than or equal to 90%. The length of the corner areas in a coiling direction is 0.5 to 4 times the thickness of a battery cell. Compared with the prior art, the quadrate lithium ion battery having a coiled structure has the advantages that the quadrate lithium ion battery has an improved electrode structure; the thickness of the electrode materials coated on corner areas of the anode and the cathode is less than that of the electrode materials coated on main areas of the anode and the cathode so that the stress produced by electrode expansion is reduced in electrode charging and discharging; a battery deformation rate is reduced; apparent thickness of the battery in circulation is reduced; battery energy density is improved; and battery performances are improved.
Description
Technical field
The utility model belongs to technical field of lithium ion, relates in particular to a kind of rectangular lithium ion battery of takeup type structure, particularly a kind of rectangular lithium ion battery that can reduce the takeup type structure of deformation rate.
Background technology
The rectangular cell regular shape, thickness is controlled, can adapt to the trend of modern consumption electronics ultra-thin development; The relative cylindrical battery specific area of rectangular cell shape is large simultaneously, is conducive to the heat radiation of high capacity cell; Square structure also is conducive to the assembling of extensive battery, therefore also is suitable for the application of the extensive energy storage such as automobile power cell, energy-storage battery.At present, the assembling mode of rectangular cell electrode, diaphragm assembly mainly comprises lamination and coiling dual mode.Wherein, winding method assembling rectangular cell is conducive to mechanical automation production, enhances productivity and the reliability of product.
Yet with respect to the battery of laminated structure, the battery of takeup type structure deforms in cyclic process easily, thereby causes cell thickness to increase, and volume energy density reduces, and causes interelectrode interface variation, and battery performance worsens.Desirable rectangular cell should be a smooth square shape, and battery distortion refers to some position protuberance of battery and back side depression, or some position depression and various the making such as back side protuberance are caused the irregular phenomenon of battery.The reason that this phenomenon occurs is to cause having inhomogeneous stress distribution at the inside battery diverse location because electrode expands in the battery charging and discharging cyclic process of takeup type structure, thereby deforms easily; And the battery of laminated structure, each pole piece is independent, stacked in parallel, and pole piece evenly expands, and does not have stress distribution, thereby laminated battery plate is the even expansion of whole thickness direction, not have the problem of being out of shape.
The expansion of electrode in cyclic process comprises because the stress that the lattice dilatation, electrolyte in the electrode material charge and discharge process produces to the swelling of electrode, because of the electrode course of processing discharges the electrode that causes gradually in cyclic process expand, and the expansion that causes because of the skin covering of the surface growth in cyclic process of electrode active material.In laminated battery plate, evenly expand in each position of pole piece, and simultaneously each collector is not an integral body, can not limit mutually, so electrode is when expanding, and battery can wholely expand uniformly, is difficult for causing the problem of battery distortion.And the battery of takeup type structure, pole piece is subject to the constraint of collector, barrier film when expanding, thereby the inner non-homogeneous stress that produces is distributed, and causes the battery problem on deformation.
In view of this, necessaryly provide a kind of rectangular lithium ion battery that can solve the takeup type structure of problem on deformation.
The utility model content
The purpose of this utility model is: for the deficiencies in the prior art, and provide a kind of rectangular lithium ion battery that can solve the takeup type structure of problem on deformation.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of rectangular lithium ion battery of takeup type structure, comprise battery core, be used for holding the packaging bag of described battery core and be poured into the interior electrolyte of described packaging bag, described battery core comprises positive pole, negative pole and be interval in barrier film between described positive pole and the negative pole, described positive pole comprises plus plate current-collecting body and is coated on positive electrode material layer on the plus plate current-collecting body, described negative pole comprises negative current collector and is coated on negative electrode material layer on the negative current collector, less than or equal to 90%, described corner area is 0.5～4 battery core thickness in the length of coiling direction to described positive pole at the ratio of the thickness of the positive electrode material layer of the thickness of the positive electrode material layer of corner area and anodal body regions.Wherein, corner area refers near the zone of electrode its angle position.Its length at coiling direction of corner area is about 0.5～4 times of battery core thickness, and is best with 1～2 times battery core thickness, the too short effect that then is difficult to play the distortion of inhibition battery, the oversize energy content of battery density loss that then causes.Simultaneously, corner area comparative electrode angle position is as far as possible symmetrical, and its corner area both sides, relative rotation place Length Ratio so that distribution of electrodes is even, reaches better effect between 0.6～1.5.
Body regions refers to the zone except corner area.Use the battery of this electrode assembling of optimizing structure, discharge and recharge, in the cyclic process, the stress that produces because electrode expands at the corner area of its winding-structure is little, has alleviated the inhomogeneous problem of stress distribution, thereby can reduce the deformation rate of battery.Find in force, when the positive electrode layer thickness of corner area be equivalent to anodal body regions electrode material layer thickness 90% the time, the battery distortion namely is improved.
As a kind of improvement of the rectangular lithium ion battery of the utility model takeup type structure, described negative pole at the ratio of the thickness of the negative electrode material layer of the thickness of the negative electrode material layer of corner area and negative pole body regions less than or equal to 90%.For the electrode layers thickness of realizing the coating of electrode (negative or positive electrode) corner area is lower than the body regions electrode layers thickness, can adopt following implementation method:
The first is disposable coating, then draw at corner area, the sticking method such as get is taken out a certain amount of slurry or dry after the method such as worn, rejecting reduce active coating thickness;
The second is the slit of step adjusting dispense tip, directly is coated with less slurry at corner area;
The third is twice coating process, i.e. first integral body coating one deck, and then coating body regions is coated on corner area for the second time and is not coated with;
Wherein first method and second method are comparatively difficult on the implementation, and the third method is present comparatively simple, feasible method.
As a kind of improvement of the rectangular lithium ion battery of the utility model takeup type structure, described positive pole at the ratio of the thickness of the positive electrode material layer of the thickness of the positive electrode material layer of corner area and anodal body regions less than or equal to 30%.At this moment, the corner area active material is less, and it is few that the space is many, electrode expands; Cell expansion is mainly reflected in body regions, and there is stress distribution hardly in inside battery, and this moment, the electrode expansion was similar on impact and the laminated batteries of battery, and is cell integrated in the thickness direction expansion, and substantially do not have the phenomenon of distortion.
A kind of improvement as the rectangular lithium ion battery of the utility model takeup type structure, the corner area of described positive pole is blank plus plate current-collecting body, this is a kind of special circumstances of the present utility model, that is to say also coating electrode active material not of corner area, the expansion of at this moment battery charging and discharging cyclic process is similar to the expansion behavior of laminated batteries, and the deformation rate that reduces the circulating battery process is had preferably effect.
But because exposed collector produces dendritic metal fragment easily at its edge, this fragment pierces through easily barrier film and causes battery short circuit.Therefore, need to apply protective layer in uncoated zone, the short circuit of avoiding dendrite to cause.This protective layer can be realized by following several method
Method one is to tape, and uses the adhesive tape of some chemistry, electrochemical stability, pastes in blank collector zone;
Method two is that coated polymer layer or inorganic particle/binding agent protective finish are regional in blank collector;
Method three is that coated with conductive agent/binding agent conductive coating is on collector.
Front two kinds of methods can cover a small amount of zone, blank collector front and back, and rear a kind of method can be applied on the collector before the coating active material.Method one applies the mode more complicated, but protects effective; Method two needs the degree of precision coating machine; Mode three can cause the volume energy density loss, but can reduce the internal resistance of cell, is conducive to improve power density.But actual use flexibility is selected.For method one described adhesive tape, there is not special requirement, as long as some strength is arranged, can pierce through by anti-metallic particles, in battery system, keep simultaneously chemistry, electrochemical stability to get final product.Do not have specific (special) requirements for the described inorganic particle of method two, but require in electrolyte, not dissolve, in battery system, keep chemistry, electrochemical stability, such as alundum (Al2O3), titanium dioxide, zirconium dioxide, magnesium oxide, aluminum phosphate, zeolite etc.There is not special requirement for method two and method three described polymer and binding agent, as long as in battery system, keep caking property, chemistry, electrochemical stability, such as BS, polyvinylidene fluoride, vinylidene fluoride-TFE copolymer, calcium polyacrylate (CPA), polyester, polyimides etc.The thickness of adhesive tape, protective finish, conductive coating is not less than a times of collector, to reach basic protection requirement; The white space thinner thickness is not more than three times of collector thickness, so that can be brought into play the effect of design.
As a kind of improvement of the rectangular lithium ion battery of the utility model takeup type structure, described corner area is 1～2 battery core thickness in the length of coiling direction.
For the battery of winding-structure, from the past outer development of the internal layer of winding-structure, every increase one deck, the girth of electrode increases to some extent.Therefore, as a kind of optimal design, corner area its in the length of coiling direction with its position in battery core, increase progressively from the inside to the outside; Every layer of corner area length is 0.5～4 times of the folded cell thickness of its corner both sides collector, and more optimum design then is 1～2 times of the folded battery core thickness of corner both sides collector.So both be conducive to keep the proper alignment of pole piece body regions, and be conducive to again reach the purpose that reduces deformation rate with lower energy density loss.
In actual implementation process, can use separately the positive pole of optimizing structure, also can use simultaneously positive pole and the negative pole of optimizing structure; Negative pole, positive pole can be separate employing in various degree than scumbling cloth thickness or coating electrode material layer not.But separate out for fear of active lithium metal, negative pole must be higher than the capacity that the corresponding region positive pole is emitted lithium at the capacity of the lithium accepted in any zone, therefore can not use separately this negative pole of optimizing structure, or negative pole can not be lower than in weight and the body regions weight ratio of corner area anodal in corner area weight and body regions weight ratio.
Same separates out for fear of lithium metal, the normal dispensing area of negative pole should exceed anodal normal dispensing area, to avoid relatively moving of in battery assembling, use procedure both positive and negative polarity position, cause thinner or without the positive pole of the thicker coating of negative pole correspondence of coating electrode material, cause analysing lithium.The width that the size that depends on production process and the battery itself of battery, the normal dispensing area of negative pole should exceed anodal normal dispensing area can be 0.5mm～10mm.
The utility model is applicable to electrode at the battery system of processing, discharging and recharging, electrode has thickness swelling in the cyclic process.Shell to electrolyte, barrier film and battery does not have special requirement.Positive electrode active materials is not had special requirement yet, and lithium-transition metal composite oxide, lithium transition metal phosphates, lithium transition-metal silicate, lithium transition-metal fluorosulfuric acid salt etc. all can be used as the positive active material of the battery of this utility model.The anticathode material is without specific (special) requirements, more obvious for the battery advantage of using the material that lattice dilatation is larger in the charge and discharge process, such as alloy material of cathode such as graphite (the particularly Delanium of high graphitization degree, native graphite), silicon and silicon/carbon compound cathode materials, SnCoC etc.
With respect to prior art, the utility model has been optimized the takeup type rectangular lithium ion battery of electrode structure, corner area at its electrode, the electrode material layer thickness of coating is lower than the electrode material layer thickness of its body regions, with this reduce battery discharge and recharge and cyclic process in the stress that expands and to cause because of electrode, reduce the deformation rate of battery, reduce the apparent thickness of circulating battery process, improve the energy density of battery, and improve battery performance.
Description of drawings
Below in conjunction with the drawings and specific embodiments, lithium ion battery of the present utility model is elaborated, wherein:
Fig. 1 is the coiled square battery structural representation of the utility model embodiment 1 to 5;
Fig. 2 is the coiled square battery structural representation of the utility model embodiment 6 to 10;
Fig. 3 is the coiled square battery structural representation of the utility model embodiment 11 to 13.
Embodiment
Below in conjunction with embodiment and test result, the utility model is described in further detail.But execution mode of the present utility model is not limited to this.
As shown in Figure 1, the rectangular lithium ion battery of a kind of takeup type structure of the utility model, comprise battery core, be used for holding the packaging bag of described battery core and be poured into the interior electrolyte of described packaging bag, described battery core comprises anodal 1, negative pole 2 and be interval in described anodal 1 and negative pole 2 between barrier film 3, described anodal 1 comprises plus plate current-collecting body 11 and is coated on positive electrode material layer 12 on the plus plate current-collecting body 11, described negative pole 2 comprises negative current collector 21 and is coated on negative electrode material layer 22 on the negative current collector 21, the ratio of the thickness of the thickness of the positive electrode material layer 12 of described anodal corner area 13 and the positive electrode material layer 12 of anodal body regions is less than or equal to 90%, and described anodal corner area 13 is 0.5～4 battery core thickness in the length of coiling direction.
As shown in Figure 2, the ratio of the thickness of the negative electrode material layer 22 of the thickness of the negative electrode material layer 22 of negative pole corner area 15 and negative pole body regions is less than or equal to 90%.
As shown in Figure 3, the corner area of positive pole 1 and negative pole 2 is blank plus plate current-collecting body, i.e. uncoated active material layer.At this moment; in order to prevent that blank collector from puncturing barrier film 3; blank plus plate current-collecting body at anodal corner area 13 and negative pole corner area 15 is provided with protective layer 14, and this protective layer 14 can be adhesive tape, protective finish or conductive coating, and the thickness of protective layer 14 is 1～3 times of respective episode fluid.
Certainly, although only express in the utility model accompanying drawing anodal 1 and/or the one side of the corner area of negative pole 2 thickness is set less than the zone of the thickness of respective electrode body regions, obvious, can also be anodal 1 and/or the another side of the corner area of negative pole 2, perhaps anodal 1 and/or the two-sided thickness that all arranges of the corner area of negative pole 2 less than the zone of the thickness of respective electrode body regions.
Embodiment 1
Anodal 1 preparation: with the cobalt acid lithium powder (LiCoO of 94 weight portions
2), the acetylene black of 3 weight portions, the polyvinylidene fluoride (PVDF) of 3 weight portions, an amount of n-methlpyrrolidone, use the homogenizer dispersed with stirring, make it form uniform anode sizing agent.Then use the method for twice coating, twice compacting: at first use continuous coating method, this slurry is coated on the aluminum foil current collector, after the double spread dry out solvent anodal density is pressed onto 3.8g/cm
3Then be coated with the second layer, the second layer uses the gap coating method, and anodal gap width is 2 times of cell thickness, coating width is that battery winding direction width deducts gap width between every adjacent two gaps, and the coating weight ratio of anodal corner area 13 and body regions sees Table 1; Pole piece is cropped to suitable size, obtains unit positive pole 1.
The preparation of negative pole 2: with the natural graphite powder of 94 weight portions, the acetylene black of 1.5 weight portions, the butadiene-styrene rubber (emulsion of 2.5 weight portions, solid content about 50%, 2.5 be dry state substance weight ratio), the sodium carboxymethylcellulose of 2 weight portions, an amount of water, use the homogenizer dispersed with stirring, make it form uniform cathode size, wherein SBR emulsion just adds in the scattered rear final step of slurry, and low rate mixing is to prevent emulsion breaking.This slurry is coated on the Copper Foil collector, dry out solvent, the unit are negative pole coating weight of single face is 8.86mg/cm after the oven dry
2, then with identical weight coating another side; With the pole piece compacting, the density of coating is about 1.6g/cm after the compacting
3Pole piece is cropped to suitable size, obtains unit negative pole 2.
Electrolyte: with lithium hexafluoro phosphate (LiPF
6) be added to take weight ratio as ethylene carbonate: diethyl carbonate: in the mixed solvent of methyl ethyl carbonate=1: 1: 1, making lithium salt is 1 mole every liter, add sour vinylene as additive, vinylene carbonate accounts for 3% of electrolyte weight, obtains electrolyte.
Barrier film 3 is selected polypropylene porous film.
The preparation of lithium rechargeable battery: positive pole 1, barrier film 3, negative pole 2 coilings are formed electrode assemblie, and barrier film 3 is between positive pole 1 and the negative pole 2.The electrode group of gained is put into the battery case bag.In battery case, inject electrolyte, the Vacuum Package battery case.This battery is charged to 50%SOC with constant current 0.05C, and then vacuum is got rid of gas, and secondary encapsulation is namely finished the making of battery.
Embodiment 2～13
The negative pole of embodiment 2～5 adopts the method making identical with embodiment 1.The positive pole 1 of embodiment 2～5, the positive pole 1 of embodiment 6～10 and negative pole 2 all adopt the implementation method of twice coating, twice compacting.The positive pole 1 of embodiment 2 to 13 and the coating condition of negative pole 2 see Table 1.Wherein, the specific operation process of twice coating, twice compacting is as follows: use continuous coating method, the density with positive pole 1 behind the double spread is pressed onto 3.8g/cm
3, the density of negative pole 2 is pressed onto 1.5g/cm
3Then be coated with the second layer, the second layer uses the gap coating method, and anodal 1 gap width is 2 times of cell thickness, and the gap width of negative pole 2 is 1.2 times of cell thickness, and coating width is that battery winding direction width deducts gap width between every adjacent two gaps; In all embodiments of the present utility model, battery winding direction width is 200mm, and cell thickness is 5mm.After double-deck coated, the two-layer electrode coating total weight of double-deck applying area anodal 1 is 20.13mg/cm
2, negative pole 2 is 8.86mg/cm
2, with the electrode compacting, make the electrode layer averag density of double-deck applying area, anodal 1 is 4.1g/cm
3, negative pole 2 is 1.6g/cm
3The positive pole 1 of embodiment 11 to 13, negative pole 2 are only with the intermittent mode coating, and gap coating dimensional parameters is identical with the gap painting parameter of top embodiment, and coating weight anodal 1 is 20.13mg/cm
2, negative pole 2 is 8.86mg/cm
2, with the electrode compacting, making the coating density of positive pole 1 is 4.1g/cm
3, the coating density of negative pole 2 is 1.6g/cm
3Paste the green glue of 20um thickness in the blank collector zone of electrode.The operation of embodiment 12 is with embodiment 11, and different is that blank collector zone is coated with protective finish, and this protective finish comprises polyvinylidene fluoride and alundum (Al2O3), and the thickness of protective finish is 10 μ m.The operation of embodiment 13 is with embodiment 11, and different is before coating in blank collector zone coated with conductive coating, and conductive coating is the BS layer.
Take the corner position of center line as turning around of interstitial area, positive pole 1, barrier film 3, negative pole 2 coilings are formed electrode assemblie, barrier film 3 is between positive pole 1 and the negative pole 2.The electrode group of gained is put into the battery case bag.According to the method for embodiment 1 to battery encapsulate, initial charge, exhaust and secondary encapsulation, finish battery and make.
Table 1: the positive and negative electrode corner area coating weight of each embodiment, and electrode fabrication well after the ratio of corner area coating layer thickness and body regions coating layer thickness
* annotate: corner area and body regions thickness ratio are that 1 electrode is the gapless district, the making that is coated with continuously, once colds pressing of use individual layer; Ratio is that 0 use individual layer intermittently is coated with, and once colds pressing, and green glue or applying protecting coat paste in the post gap district of colding pressing, and perhaps go to coated with conductive coating on the blank collector in coating.
Circulating battery expands and the deformation rate test:
With 1C multiplying power constant current battery is charged to 4.2V, charges to electric current as 0.05C take the 4.2V constant voltage again, then with 1C multiplying power constant current discharge to 3.0V; Repeatedly charge, discharge 100 times.And then the battery constant current/constant voltage charged to 4.2V, and use the thickness distribution of laser thickness gauge scanning survey battery, calculate the average thickness of battery, be designated as T (100); Clamp batteries with two parallel flat boards, the clamping dynamics is 0.5 kilogram, with the maximum ga(u)ge of distance between two flat boards after as 100 circulations of battery, be designated as T (100, max).(100, max)/deformation rate of T (100)-1 after as the circulation of battery 100 week, its result is as shown in table 2 with T.
And the battery of the corner area that obtains with the coating of the one-time continuous of the routine pole piece preparation identical with body regions thickness is under identical test condition, and the deformation rate after 100 circulations is 2.46%.
Table 2: the deformation rate after 100 circulations of the battery of embodiment 1 to 13
Find out from table 2, when anodal corner area 13 adopts lower electrode coating weight, thereby reduce the coating layer thickness ratio of anodal corner area 13 and anodal body regions, or anodal 1 and negative pole 2 reduce simultaneously the coating layer thickness in corner area and electrode coating zone than after, the deformation of battery obviously alleviates.The coating layer thickness of anodal corner area 13 is down to 0.9 o'clock of body regions thickness, deformation rate can be reduced to 2.35% from 2.46%, the coating layer thickness of anodal corner area 13 and negative pole corner area 15 is down to 0.9 o'clock of body regions thickness of respective electrode simultaneously, and deformation rate can be reduced to 2.27% from 2.46%; When the corner area coating layer thickness be down to body regions thickness 0.3 or when following, the improvement effect is then more obvious, as when anodal corner area 13 coating layer thicknesses be 0.3 of body regions coating layer thickness, the coating layer thickness of negative pole corner area 15 is 0.1 o'clock of body regions coating layer thickness, the deformation rate of battery only has 0.52%, and deformation extent only has 1/5th of conventional batteries.
Battery is in charge and discharge process, pole piece can produce expansion, and the reason that causes pole piece to expand comprises the factors such as growth of stress that lattice dilatation in the electrode material charge and discharge process, electrolyte produce to the swelling of electrode, because of the electrode course of processing discharging gradually in cyclic process, electrode active material skin covering of the surface in cyclic process.The coiled square battery of prior art, the expansion of pole piece is limited by collector, barrier film, and the expansion of pole piece will cause inside battery to produce stress and inhomogeneous stress distribution, thereby cause the battery structure distortion that is distorted.Technology of the present utility model is thinner at the corner of winding-structure coating layer, uneven distribution that can relieve stresses; Thinner when corner area or not during the coating electrode layer, the corner area space is larger simultaneously, can make cell expansion be similar to the expansion fashion of laminated batteries, namely wholely expand rather than bird caging at thickness direction, therefore can alleviate the deformation of battery.
The according to the above description announcement of book and instruction, the utility model those skilled in the art can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the utility model is not limited to also should fall in the protection range of claim of the present utility model modifications and changes more of the present utility model.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the utility model just for convenience of description.
Claims (10)
1. the rectangular lithium ion battery of a takeup type structure, comprise battery core, be used for holding the packaging bag of described battery core and be poured into the interior electrolyte of described packaging bag, described battery core comprises positive pole, negative pole and be interval in barrier film between described positive pole and the negative pole, described positive pole comprises plus plate current-collecting body and is coated on positive electrode material layer on the plus plate current-collecting body, described negative pole comprises negative current collector and is coated on negative electrode material layer on the negative current collector, it is characterized in that: less than or equal to 90%, described corner area is 0.5～4 battery core thickness in the length of coiling direction to described positive pole at the ratio of the thickness of the positive electrode material layer of the thickness of the positive electrode material layer of corner area and anodal body regions.
2. the rectangular lithium ion battery of takeup type structure according to claim 1 is characterized in that: described negative pole at the ratio of the thickness of the negative electrode material layer of the thickness of the negative electrode material layer of corner area and negative pole body regions less than or equal to 90%.
3. the rectangular lithium ion battery of takeup type structure according to claim 1 is characterized in that: described positive pole at the ratio of the thickness of the positive electrode material layer of the thickness of the positive electrode material layer of corner area and anodal body regions less than or equal to 30%.
4. the rectangular lithium ion battery of takeup type structure according to claim 3, it is characterized in that: the corner area of described positive pole is blank plus plate current-collecting body.
5. the rectangular lithium ion battery of takeup type structure according to claim 4, it is characterized in that: post adhesive tape on the blank plus plate current-collecting body of described corner area, the thickness of described adhesive tape is 1～3 times of plus plate current-collecting body.
6. the rectangular lithium ion battery of takeup type structure according to claim 4 is characterized in that: scribble protective finish on the blank plus plate current-collecting body of described corner area.
7. the rectangular lithium ion battery of takeup type structure according to claim 6, it is characterized in that: the thickness of described protective finish is 1～3 times of plus plate current-collecting body.
8. the rectangular lithium ion battery of takeup type structure according to claim 4 is characterized in that: scribble conductive coating on the blank plus plate current-collecting body of described corner area.
9. the rectangular lithium ion battery of takeup type structure according to claim 8, it is characterized in that: the thickness of described conductive coating is 1～3 times of plus plate current-collecting body.
10. the rectangular lithium ion battery of takeup type structure according to claim 1, it is characterized in that: described corner area is 1～2 battery core thickness in the length of coiling direction.
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2012
- 2012-04-16 CN CN2012201569745U patent/CN202905885U/en not_active Expired - Lifetime
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