CN203746957U - Power battery pole core and power battery thereof - Google Patents
Power battery pole core and power battery thereof Download PDFInfo
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- CN203746957U CN203746957U CN201320764019.4U CN201320764019U CN203746957U CN 203746957 U CN203746957 U CN 203746957U CN 201320764019 U CN201320764019 U CN 201320764019U CN 203746957 U CN203746957 U CN 203746957U
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- Prior art keywords
- pole
- negative
- screening glass
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- negative pole
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- 239000011888 foil Substances 0.000 claims abstract description 100
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- 230000015572 biosynthetic process Effects 0.000 claims abstract description 11
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- 229910003002 lithium salt Inorganic materials 0.000 description 2
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- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910015175 LixMn2-yByO2 Inorganic materials 0.000 description 1
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- UMOAGNWVKLAAPT-UHFFFAOYSA-M O.P(=O)(O)(O)[O-].[Li+].[F] Chemical compound O.P(=O)(O)(O)[O-].[Li+].[F] UMOAGNWVKLAAPT-UHFFFAOYSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- NOJZFGZMTUAHLD-UHFFFAOYSA-N [Li].[Cl] Chemical compound [Li].[Cl] NOJZFGZMTUAHLD-UHFFFAOYSA-N 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
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- SIXOAUAWLZKQKX-UHFFFAOYSA-N carbonic acid;prop-1-ene Chemical compound CC=C.OC(O)=O SIXOAUAWLZKQKX-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002931 mesocarbon microbead Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- YYSONLHJONEUMT-UHFFFAOYSA-N pentan-3-yl hydrogen carbonate Chemical compound CCC(CC)OC(O)=O YYSONLHJONEUMT-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a power battery pole core and a power battery thereof. The powder battery pole core comprises a positive pole lug and a negative pole lug, wherein multiple layers of metal foils formed by winding of a non-dressing area of a positive pole are welded into a whole through a positive pole protective sheet; multiple layers of metal foils formed by winding of a non-dressing area of a negative pole are welded into a whole through a negative pole protective sheet; the width of the positive pole protective sheet is smaller than that of the multiple layers of metal foils formed by winding of the non-dressing area of the positive pole, and the width of the negative pole protective sheet is smaller than that of the multiple layers of metal foils formed by winding of the non-dressing area of the negative pole. The powder battery comprises the power battery pole core. The pole core is less prone to deformation, dislocation is mitigated when connecting pieces are welded, the assembly effect is good, and the pole core is further conductive to automated production; when in welding, the harm to the positive pole lug and the negative pole lug can be avoided, folds and dendrites of pole sheets after formation are obviously reduced, and the performances of the battery are further upgraded.
Description
Technical field
The utility model relates to electrokinetic cell field, especially refers to pole piece in electrokinetic cell.
Background technology
The public is day by day responsive to the environmental problem that uses the cost of fossil fuel and therefore cause, and this makes to reduce use cost, reduces the substitute of the conventional truck such as hybrid vehicle, pure electric vehicle of environmental pressure and is serving as the role who becomes more and more important.Although the use cost of the mixed power car in consumer and countries in the world and pure electric vehicle is cheap, environmental friendliness advantage attracts, they still require hybrid vehicle and pure electric automobile that good power performance and high security performance can be provided.
Electrokinetic cell is as one of core component of hybrid electric vehicle and pure electric vehicle, day by day by auto vendor and battery producer are paid attention to, owing to will considering the requirements such as high power capacity, high magnification, high security, the internal structure of existing electrokinetic cell and small-sized battery of mobile phone etc. is slightly had any different.
Existing electrokinetic cell generally comprises housing, cover plate, and is contained in pole piece and electrolyte in housing, cover plate, is generally also provided with positive and negative electrode terminal on this cover plate, and itself and cover plate insulate.Wherein pole piece is formed by positive plate, barrier film, negative plate successively stacked rear coiling.And all the edge on Width is separately provided with not dressing district on positive plate, negative plate, using Gai Wei dressing district as positive and negative lug.After coiling, positive and negative lug forms the structure of multilayer metal foil, and the inner of described positive and negative electrode terminal is electrically connected on the positive and negative lug of so-called multilayer metal foil on pole piece by electric connecting sheet respectively.The positive and negative lug that is multiple layer metal foil construction is directly welded on electric connecting sheet.
The mode that this kind of pole piece and electrical connector directly weld, when welding, large, yielding, the lug of pole piece thickness easily misplaces, and is unfavorable for assembling and automated production; Meanwhile, change into rear pole piece fold seriously and with dendrite, affect battery performance.
Summary of the invention
For the pole piece that overcomes prior art medium power battery directly welds with electrical connector, pole piece thickness is large, yielding, lug easily misplaces, be unfavorable for assembling and automated production, change into rear pole piece fold serious and with dendrite simultaneously, affect the problem of battery performance, the utility model embodiment provides a kind of electrokinetic cell pole piece, electrokinetic cell and preparation method thereof.
The utility model provides a kind of electrokinetic cell pole piece, is formed by the stacked rear coiling of positive plate, barrier film and negative plate;
Described positive plate comprises positive electrode metallic foil and applies positive electrode thereon, described positive plate is provided with and applies the anode dressing district of described positive electrode and not dressing district of the positive pole of uncoated described positive electrode, and described positive pole not dressing district is arranged on the edge on described positive plate Width;
Described negative plate comprises negative electrode metallic foil and applies negative material thereon, described negative plate is provided with and applies the negative pole dressing district of described negative material and not dressing district of the negative pole of uncoated described negative material, and described negative pole not dressing district is arranged on the edge on described negative plate Width;
Described positive pole not dressing district and described negative pole does not all form the structure of multilayer metal foil in dressing district after reeling;
Wherein, described electrokinetic cell pole piece comprises anode ear and negative electrode lug, described anode ear comprises by not the reel multilayer metal foil and the anodal screening glass that form of dressing district of positive pole, and described negative electrode lug comprises by not the reel multilayer metal foil and the negative pole screening glass that form of dressing district of negative pole; The described positive pole multilayer metal foil that dressing district coiling does not form is welded as a whole by anodal screening glass; The described negative pole multilayer metal foil that dressing district coiling does not form is welded as a whole by negative pole screening glass; The width of described anodal screening glass is less than the width of the multilayer metal foil of anodal not dressing district coiling formation, and the width of described negative pole screening glass is less than the width of the negative pole multilayer metal foil that dressing district coiling forms.
Further, the width of above-mentioned anodal screening glass or negative pole screening glass is 6-8mm, and the width of the multilayer metal foil that anodal not dressing district coiling forms or the negative pole multilayer metal foil that dressing district coiling forms is 7-9mm.
The length of above-mentioned anodal screening glass is less than the length of the multilayer metal foil of anodal not dressing district coiling formation, and the length of negative pole screening glass is less than the length of the negative pole multilayer metal foil that dressing district coiling forms.
Further, the length of above-mentioned anodal screening glass or negative pole screening glass is 58-62mm, and the length of the multilayer metal foil that anodal not dressing district coiling forms or the negative pole multilayer metal foil that dressing district coiling forms is 98-103mm.
Preferably, the thickness of above-mentioned anodal screening glass and negative pole screening glass be positive electrode metallic foil and negative electrode metallic foil thickness 10-20 doubly.
Preferably, the thickness of above-mentioned anodal screening glass and described negative pole screening glass is 100-250 micron.
Further, above-mentioned anodal screening glass is identical with the material of positive electrode metallic foil, and negative pole screening glass is identical with the material of described negative electrode metallic foil.
Further, anodal screening glass and positive electrode metallic foil are aluminium foil, and negative pole screening glass and described negative electrode metallic foil are Copper Foil.
Preferably; above-mentioned anodal screening glass is 2-4 with the solder joint number of anodal not dressing district welding; negative pole screening glass and negative pole not the solder joint number of dressing district welding are 2-4, and the phase of solder joint of the solder joint of anodal screening glass welding and the welding of negative pole screening glass is and is symmetrically arranged for pole piece.
Further, be coated with positive electrode on the two sides of positive plate, be coated with negative material on the two sides of negative plate.
In addition, the utility model also provides a kind of electrokinetic cell, comprises pole piece, electrolyte, housing and cover plate; Described electrolyte, pole piece are contained in the spatial accommodation of described housing and cover plate formation;
Described pole piece is the above-mentioned described electrokinetic cell pole piece of mentioning;
Described shell is provided with positive terminal, negative terminal, and described positive terminal is electrically connected to described anode ear by positive strap, and described negative terminal is electrically connected to described negative electrode lug by negative pole brace.
Adopt the disclosed electrokinetic cell pole piece of the utility model and electrokinetic cell thereof; owing to having increased anodal screening glass and negative pole screening glass in the pole piece in its electrokinetic cell; in advance the multilayer metal foil of anode ear is welded as a whole by above-mentioned anodal screening glass, in advance negative electrode lug multilayer metal foil is welded as a whole by above-mentioned negative pole screening glass.So, the pole piece attenuation after anode ear, negative electrode lug pre-welding, more smooth; Simultaneously pole piece is not yielding, and when soldered fitting, dislocation alleviates, and therefore assembles effectively, is beneficial to automated production; When welding, can not damage anode ear, negative electrode lug, making to change into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
Brief description of the drawings
Fig. 1 is the electrokinetic cell pole piece decomposing schematic representation providing in the utility model embodiment;
Fig. 2 is schematic perspective view after the electrokinetic cell pole piece coiling providing in the utility model embodiment;
Fig. 3 is the electrokinetic cell decomposing schematic representation providing in the utility model embodiment;
Fig. 4 is that the power pole piece providing in the utility model embodiment is made flow chart;
Fig. 5 is that the electrokinetic cell providing in the utility model embodiment is made flow chart;
Fig. 6 is the relatively schematic diagram of the loose point of cell thickness after the battery that adopts the utility model embodiment 5 and comparative example 1 to make changes into;
Fig. 7 disassembles the positive plate fold monodrome comparison diagram obtaining after the battery that adopts the utility model embodiment 5 and comparative example 1 to make changes into;
Fig. 8 disassembles the negative plate fold monodrome comparison diagram obtaining after the battery that adopts the utility model embodiment 5 and comparative example 1 to make changes into;
Fig. 9 disassembles the negative plate dendrite monodrome comparison diagram obtaining after the battery that adopts the utility model embodiment 5 and comparative example 1 to make changes into;
Figure 10 is the capacity surplus ratio comparison diagram after the battery that adopts the utility model embodiment 5 and comparative example 1 to make changes into.
Wherein, 1, positive plate; 2, barrier film; 3, negative plate; 4, housing; 5, cover plate 5; 11, not dressing district of positive pole; 12, anode dressing district; 13, anodal solder joint; 14, anodal screening glass; 31, not dressing district of negative pole; 32, negative pole dressing district; 33, negative pole solder joint; 34, negative pole screening glass; 51, positive terminal; 52, negative terminal; 53, anodal insulating element; 54, negative pole insulating element; 55, positive strap; 56, negative pole brace; 100, pole piece.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Inventor finds in R&D process, existing pole piece adopts the mode of positive plate, barrier film, the stacked rear coiling of negative plate, the both sides of the rolled pole piece after coiling all form not dressing district as positive and negative lug, and then itself and electric connecting sheet are directly welded, with extracted current to electrode terminal.But due to anode ear, the structure that negative electrode lug is multilayer metal foil after reeling, when welding, large, yielding, the lug of pole piece thickness easily misplaces, and is unfavorable for assembling and automated production; Meanwhile, change into rear pole piece fold seriously and with dendrite, affect battery performance.And the thickness of metal forming is very thin, when welding, easily hurt this metal forming.Through inventor's intellectual work and through test of many times checking, finally solve this problem.To carry out concrete example explanation to solution below.
embodiment 1
This example will be made specific explanations explanation to electrokinetic cell pole piece 100, and shown in following Fig. 1, Fig. 2, in figure, the X of mark is to the length direction that is positive plate 1, barrier film 2, negative plate 3, and Y-direction is the Width of positive plate 1, barrier film 2, negative plate 3.X is to being that length direction is also the coiling direction of pole piece 100.
Below will be taking lithium ion battery as electrokinetic cell as example describe, the electrokinetic cell pole piece 100 that this example provides, is formed by the stacked rear coiling of positive plate 1, barrier film 2 and negative plate 3;
Described positive plate 1 comprises positive electrode metallic foil and applies positive electrode thereon, described positive plate 1 is provided with and applies the anode dressing district 12 of described positive electrode and not dressing district 11 of the positive pole of uncoated described positive electrode, and described positive pole not dressing district 11 is arranged on the edge on described positive plate 1 Width;
Described negative plate 3 comprises negative electrode metallic foil and applies negative material thereon, described negative plate 3 is provided with and applies the negative pole dressing district 32 of described negative material and the not dressing district 31 of negative pole of uncoated described negative material, and described negative pole not dressing district 31 is arranged on the edge on described negative plate 3 Widths;
Described positive pole not dressing district 11 and described negative pole does not all form the structure of multilayer metal foil in dressing district 31 after reeling;
Wherein, electrokinetic cell pole piece comprises anode ear and negative electrode lug, described anode ear comprises by not the reel multilayer metal foil and the anodal screening glass 14 that form of dressing district 11 of positive pole, and described negative electrode lug comprises by not the reel multilayer metal foil and the negative pole screening glass 34 that form of dressing district 31 of negative pole; The described positive pole multilayer metal foil that dressing district 11 does not reel formation is welded as a whole by anodal screening glass 14; The described negative pole multilayer metal foil that dressing district 31 does not reel formation is welded as a whole by negative pole screening glass 34; The width of described anodal screening glass 14 is less than the width of the multilayer metal foil of anodal not dressing district 11 coiling formation, and the width of described negative pole screening glass 34 is less than the width of the negative pole multilayer metal foil that dressing district 31 coilings form.
The direction of the direction of the width of above-mentioned screening glass and the width of metal forming is the direction vertical with pole piece coiling direction, and the direction of the direction of the length of the screening glass of hereinafter mentioning and the length of metal forming is the direction that pole piece is reeled.
Preferably, in the preparation process of electrokinetic cell pole piece, the width of anodal screening glass 14 or negative pole screening glass 34 is 6-8mm, and the width of the multilayer metal foil that anodal not dressing district 11 coilings form or the negative pole multilayer metal foil that dressing district 31 coilings form is 7-9mm.Above-mentioned width be according to the concrete size of electrokinetic cell pole piece and fixed, those skilled in the art can be according to the specific requirement of the electrokinetic cell of different size, and the width of concrete size is set.
Further, the length of anodal screening glass 14 is less than the length of the multilayer metal foil of anodal not dressing district 11 coiling formation, and the length of negative pole screening glass 34 is less than the length of the negative pole multilayer metal foil that dressing district 31 coilings form.
Preferably, the length of anodal screening glass 14 or negative pole screening glass 34 is 58-62mm, and the length of the multilayer metal foil that anodal not dressing district 11 coilings form or the negative pole multilayer metal foil that dressing district 31 coilings form is 98-103mm.According to the size of concrete battery, make screening glass and the metal forming of different length size.
Fig. 1 has provided the state before positive plate 1, barrier film 2, negative plate 3 coilings, before coiling, first three is stacked together, and its septation 2 is between positive plate 1, barrier film 2, negative plate 3.
Due to positive plate 1, barrier film 2, negative plate 3 stacked successively after by along its length in figure the X of mark to reeling, in Fig. 1, anodal not dressing district 11 is arranged on positive plate 1 right hand edge along X to forward, and negative pole is not arranged on negative plate 3 left hand edges along X to forward in dressing district 31.So, its result as shown in Figure 2, can make positive pole not dressing district 11 and negative pole after coiling, will not lay respectively at the two ends of described pole piece 100 in dressing district 31, i.e. the left and right sides in Fig. 2, as anode ear and negative electrode lug.
Main improvement of the present utility model adopts anodal screening glass 14 in advance the multilayer metal foil of anode ear to be welded as a whole after being to reel, and adopts negative pole screening glass 34 in advance the multilayer metal foil of negative electrode lug to be welded as a whole.
The thickness of general positive electrode metallic foil is about 16 microns, and the thickness of negative electrode metallic foil is about 10 microns.The anodal screening glass 14 that this example is mentioned, the sheet metal that negative pole screening glass 34 is rectangle; for making anodal screening glass 14, negative pole screening glass 34 play the effect of protection welding, the thickness of advising anodal screening glass 14 and negative pole screening glass 34 is positive electrode metallic foil and negative electrode metallic foil thickness 10-20 times.Such as; the thickness of described anodal screening glass 14 and described negative pole screening glass 34 is 100-250 micron; such as anodal screening glass 14 and the described negative pole screening glass 34 of this example employing 200 micron thick; when actual fabrication, adopting a slice thickness is that the metal forming doubling of 100 microns forms, the length of its anodal screening glass 14, negative pole screening glass 34, width can according to solder joint, anodal not dressing district 11, negative pole not the size in dressing district 31 determine.The size of anodal screening glass 14 can be with negative pole screening glass 34 measure-alike, can be not identical yet, preferred size is identical.Such as, the anodal screening glass 14 that this example adopts, the length of negative pole screening glass 34 are 62mm.Material for anodal screening glass 14, negative pole screening glass 34 is not particularly limited, and can adopt various metals, alloy etc.Preferably, described anodal screening glass 14 is identical with the material of positive electrode metallic foil, and described negative pole screening glass 34 is identical with the material of described negative electrode metallic foil.Adopt the metal of material of the same race,, better effects if easier than different-metal material welding.Such as described anodal screening glass 14 is aluminium foil with positive electrode metallic foil, described negative pole screening glass 34 is Copper Foil with described negative electrode metallic foil.
As preferred mode; described anodal screening glass 14 is called anodal solder joint 13 with the described positive pole solder joint that does not weld in dressing district 11; its number is 2-4; described negative pole screening glass 34 is called negative pole solder joint 33 with the described negative pole solder joint that does not weld in dressing district 31; its number is 2-4, and the phase of solder joint that the solder joint that described anodal screening glass 14 welds and described negative pole screening glass 34 weld is and is symmetrically arranged for pole piece 100.What is called is symmetrically arranged and refers to by the centre symmetry line symmetry shown in Fig. 2.
Positive plate 1 can only apply positive electrode in its one side, also can on two face, all be coated with coated positive pole material.Negative plate 3 can only apply negative material in its one side, also can on two face, all apply negative material.Preferably, be coated with positive electrode on the two sides of described positive plate 1, and be coated with negative material on the two sides of described negative plate 3.
All can adopt technology known in those skilled in the art about positive plate 1, barrier film 2, negative plate 3, therefore only it be carried out to simple example explanation.
Battery diaphragm 2 plays the effect that stops the direct contact short circuit of both positive and negative polarity in lithium ion battery.In order to improve the fail safe of battery, not only require battery diaphragm 2 can stop at normal temperatures the direct contact short circuit of both positive and negative polarity, also require at high temperature this battery diaphragm 2 also can stop the direct contact short circuit of both positive and negative polarity simultaneously.Because electrolyte is organic solvent system, thereby need to there be barrier film 2 materials of organic solvent-resistant, generally adopt the polyolefin porous membrane of high-strength thin-film.Conventional battery diaphragm 2 comprises polyethylene, polypropylene etc. now, and Kynoar is also commonly used for barrier film 2.
Positive electrode comprises positive active material, conductive agent, positive electrode is bonded to adhesive on positive electrode metallic foil, additive etc.Positive active material is the layered mixed oxide of a kind of lithium and transition metal, and they are the active materials with certain ad hoc structure, can carry out reversible reacting with lithium ion.Such as, this type of positive active material can be LixNi1-yCoyO2 (wherein, 0.9≤x≤1.1,0≤y≤1.0), LixMn2-yByO2 (wherein, B is transition metal, 0.9≤x≤1.1,0≤y≤1.0), LiFePO4 etc.Conductive agent generally can adopt carbon-based material, as carbon black, carbon fiber and graphite etc., the example of adhesive comprises that fluorine resin and polyolefin compound are as PVDF(Kynoar), PTFE(polytetrafluoroethylene), VDF-HFP-TFE(biasfluoroethylene-hexafluoropropylene-tetrafluoroethene) copolymer and SBR(butadiene-styrene rubber) etc.
Negative material comprises negative electrode active material, conductive agent, negative material is bonded to adhesive on negative electrode metallic foil, additive etc., wherein negative electrode active material is to make lithium ion repeatedly embed and carbon-based material, silicon based material, nitride, tin-based oxide, ashbury metal, the nanometer anode material of deintercalation, and other some intermetallic compounds etc.Carbon-based material comprises native graphite, Delanium, carbonaceous mesophase spherules (MCMB), mesocarbon fiber (MCF) etc.Adhesive comprises that fluorine resin and polyolefin compound are as PVDF, PTFE, VDF-HFP-TFE copolymer and SBR etc.
Owing to having added anodal screening glass 14 and negative pole screening glass 34 in this example in pole piece 100, anodal screening glass 14 is placed between anode ear and soldering tip, the anode ear of multilayer metal foil shape is welded together; And negative pole screening glass 34 is placed between negative electrode lug and soldering tip, make the negative pole lug welding of multilayer metal foil shape together.So, can carry out shaping to pole piece 100, make its smooth, attenuation; Owing in advance anode ear, negative electrode lug being welded as a whole independently of one another, pole piece 100 is not yielding, can reduce the inconsistent phenomenon while being welded to connect part, therefore assembles better effects if, is beneficial to automated production simultaneously.And owing to having increased this positive pole screening glass 14 and negative pole screening glass 34, when welding, can not damage anode ear, negative electrode lug, making to change into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
embodiment 2
The utility model provides a kind of electrokinetic cell, as shown in Figure 3, comprises pole piece 100, electrolyte, housing and cover plate 5; Described electrolyte, pole piece 100 are contained in the spatial accommodation that described housing and cover plate 5 form;
Described pole piece 100 is for mentioning described electrokinetic cell pole piece 100 in embodiment 1;
Described shell is provided with positive terminal 51, negative terminal 52, and described positive terminal 51 is electrically connected to described anode ear by positive strap 55, and described negative terminal 52 is electrically connected to described negative electrode lug by negative pole brace 56.
Because pole piece 100 specifically describes in embodiment 1, therefore this example is no longer done repeat specification.
The material of its housing generally adopts box hat or aluminum hull, and it is the rectangular-shaped hollow-core construction of an end opening; Cover plate 5 correspondences are arranged on the opening part of this housing, and described cover plate 5 and housing welding are to an airtight spatial accommodation.Pole piece 100 is encapsulated in this spatial accommodation in advance.The positive terminal 51, negative terminal 52 arranging on this cover plate 5 all with the setting of cover plate 5 mutually insulateds, as shown in Figure 3, between this positive terminal 51 and cover plate 5, be provided with anodal insulating element 53, between this negative terminal 52 and cover plate 5, be provided with negative pole insulating element 54, so that positive terminal 51, negative terminal 52 are insulated and to be connected with cover plate 5 respectively.
This positive terminal 51, negative terminal 52 can be the shapes such as screw, column or sheet.The inner of positive terminal 51, negative terminal 52 is stretched in housing, is then connected to anode ear, negative electrode lug by positive strap 55, negative pole brace 56 respectively; The outer end of positive terminal 51, negative terminal 52 is exposed to outside battery through cover plate 5, and so can be load provides the interface of power supply.
On cover plate 5, be also provided with liquid injection hole (not shown), to facilitate after cell package, electrolyte injected in battery by this liquid injection hole.Fluid injection, by steel ball or other sealing parts, liquid injection hole is sealed after changing into, to form inside battery airtight space completely.
The electrolyte of the utility model electrokinetic cell is the chain acid esters that contains lithium salts and the mixed solution of ring-type acid esters.Lithium salts comprises lithium perchlorate (LiClO4), lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), chlorine lithium aluminate, lithium halide, fluorocarbon based fluorine oxygen lithium phosphate and fluorocarbon based Sulfonic Lithium etc., can use one of them or its mixture.The example of chain acid esters comprises dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), ethyl propyl carbonic acid ester (EPC), diphenyl carbonate (DPC), methyl acetate (MA), ethyl acetate (EA), ethyl propionate (PA), dimethoxy-ethane, diethoxyethane and other is fluorine-containing, sulfur-bearing or the chain organosilane ester containing unsaturated bond, can use one of them or its mixture.The example of ring-type acid esters comprises ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (γ-BL), sultone and other is fluorine-containing, sulfur-bearing or the ring-type organosilane ester containing unsaturated bond, can use one of them or its mixture.
Certainly, generally in electrokinetic cell, also comprise the parts such as spacer ring, spacer ring can guide positive strap 55, negative pole brace 56 to pass, and prevents internal short-circuit of battery, and this is conventionally known to one of skill in the art, less with the utility model degree of association, repeats no more.
Due to this routine disclosed lithium ion battery; make pole piece 100 before welding with positive strap 55 and negative pole brace 56; anodal screening glass 14 and negative pole screening glass 34 in pole piece 100, are added; similarly; can carry out shaping to pole piece 100; make its smooth, attenuation, simultaneously owing in advance anode ear, negative electrode lug being welded as a whole independently of one another.Adopt the pole piece 100 after this kind of mode welded not yielding, can reduce the inconsistent phenomenon while being welded to connect part, therefore assemble better effects if, be beneficial to automated production.And owing to having increased this positive pole screening glass 14 and negative pole screening glass 34, when welding, can not damage anode ear, negative electrode lug, making to change into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
embodiment 3
This example discloses a kind of manufacture method of electrokinetic cell pole piece 100, as shown in Figure 4, comprises the steps:
S1, preparation process: obtain positive plate 1, barrier film 2, negative plate 3, anodal screening glass 14 and negative pole screening glass 34;
S2, coiling step: described positive plate 1, barrier film 2, negative plate 3 is stacked successively, and dressing district 11 and described negative pole are not oppositely arranged in dressing district 31 to make described positive pole; Then reel along its length, form the pole piece 100 of rolled, make described positive pole not dressing district 11 and described negative pole after reeling, all do not form the structure of multilayer metal foil in dressing district 31, and the two ends that lay respectively at described pole piece 100 are as anode ear and negative electrode lug;
S3, one welding step: the multilayer metal foil of described anodal screening glass 14 and described anode ear is welded as a whole; Described negative pole screening glass 34 and the multilayer metal foil of described negative electrode lug are welded as a whole.
In step S1, its main purpose is that follow-up coiling and one welding are prepared, be conventionally known to one of skill in the art about the manufacture method of positive plate 1, barrier film 2, negative plate 3, such as the manufacture method of positive plate 1 is generally following process: cut the aluminium foil of suitable size as positive electrode metallic foil from the aluminium foil of entire volume; The making such as positive active material, additive, adhesive, conductive agent are obtained to anode sizing agent; Then carry out compressing tablet, the process such as dry makes positive plate 1.
Similarly, similar with the manufacture method of positive plate 1, the manufacture method of negative plate 3 is generally following process: from the Copper Foil of entire volume, cut the Copper Foil of suitable size as negative electrode metallic foil; The making such as negative electrode active material, additive, adhesive, conductive agent are obtained to cathode size; Then carry out compressing tablet, the process such as dry makes positive plate 1.
After the general barrier film 2 of buying the entire volumes such as polyethylene film, polypropylene screen or composite porous film of barrier film 2, cut the barrier film 2 of suitable size from above.
Anodal screening glass 14, negative pole screening glass 34 adopt the rectangle sheet metal of suitable size.Such as anodal screening glass 14 adopts the aluminium foil that Thickness Ratio positive electrode metallic foil is thicker, it can cut into slices and obtain from the aluminium foil of entire volume, and negative pole screening glass 34 adopts the Copper Foil that Thickness Ratio negative electrode metallic foil is thicker, and it can cut into slices and obtain from the Copper Foil of entire volume.
In the time applying anode sizing agent and cathode size, need to reserve not dressing district 11 of positive pole in the edge on the Width of positive electrode metallic foil, and edge on need to the Width at negative electrode metallic foil reserves not dressing district 31 of negative pole, generally can, in the time applying slurry, directly not apply above-mentioned zone; Or apply after slurry in entirety, needs are arranged to anodal not dressing district 11 and the not region in dressing district 31 of negative pole, wipe positive electrode and negative material above off, to form not dressing district 11 and not dressing district 31 of negative pole of positive pole.
In step S2, as shown in Figure 1, so-calledly make described positive pole dressing district 11 and described negative pole are not oppositely arranged in dressing district 31, be that both non-same limits arrange, in Fig. 1, anodal not dressing district 11 is arranged on positive plate 1 right hand edge along X to forward, and negative pole is not arranged on negative plate 3 left hand edges along X to forward in dressing district 31.So, can make positive pole not dressing district 11 and negative pole not dressing district 31 after coiling, by laying respectively at the two ends of described pole piece 100, as anode ear and negative electrode lug.
Above-mentioned steps S1, S2 are conventionally known to one of skill in the art, therefore repeat no more.
Step S3 is the technique that in this example, traditional fabrication method newly increases relatively, the pole piece of winding 100 is fixed, then get an anodal screening glass 14 compress be positioned at pole piece 100 1 sides positive pole not dressing district 11(be anode ear), then with soldering tip, anodal screening glass 14 is welded, be placed in positive pole not between dressing district 11 and soldering tip by anodal screening glass 14, similarly, get a negative pole screening glass 34 compress be positioned at pole piece 100 opposite sides negative pole not dressing district 31(be negative electrode lug), then weld with soldering tip anticathode screening glass 34, being placed in positive pole by anodal screening glass 14 does not weld between dressing district 11 and soldering tip, negative pole screening glass 34 is placed in to negative pole not to be welded between dressing district 31 and soldering tip.The process of welding anodal screening glass 14 and anodal not dressing district 11 with weld negative pole screening glass 34 and negative pole not the process between dressing district 31 can successively carry out, also can carry out simultaneously.When welding, as required, its solder joint is preferably arranged to 2-4.So, be welded as a whole by the multilayer metal foil of anode ear, and the multilayer metal foil of negative electrode lug is welded as a whole.
Electrokinetic cell pole piece 100 manufacture methods that adopt this example to provide; similarly; owing to reeling after acquisition pole piece 100; add the step of one welding; anodal screening glass 14 and the multilayer metal foil of anode ear are welded as a whole, and negative pole screening glass 34 and the multilayer metal foil of negative electrode lug are welded as a whole.Adopt the pole piece 100 after this kind of mode welded not yielding, can reduce the inconsistent phenomenon while being welded to connect part, therefore assemble better effects if, be beneficial to automated production.And owing to having increased this positive pole screening glass 14 and negative pole screening glass 34, when welding, can not damage anode ear, negative electrode lug, making to change into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
embodiment 4
This example provides a kind of manufacture method of electrokinetic cell, as shown in Figure 5, comprises the steps:
SA, pole piece 100 making steps: make described pole piece 100 according to the manufacture method of the electrokinetic cell pole piece 100 described in above-described embodiment 3;
SB, encapsulation fluid injection step: described pole piece 100 is packed in the spatial accommodation that housing and cover plate 5 form, then inwardly inject electrolyte, acquisition primary cell;
SC, change into sealing step: described primary cell is changed into, sealed after exhaust.
Step SA describes in detail in embodiment 3, repeats no more.SB, SC are conventionally known to one of skill in the art, wherein, about encapsulation, fluid injection, change into, the technique such as exhaust, sealing all can adopt existing technology.The utility model is not limited.Therefore also no longer describe in detail.
Similarly; in the electrokinetic cell manufacture method providing due to this example; improved pole piece 100 manufacture methods are comprised; reeling after acquisition pole piece 100; add the step of one welding; anodal screening glass 14 and the multilayer metal foil of anode ear are welded as a whole, and negative pole screening glass 34 and the multilayer metal foil of negative electrode lug are welded as a whole.Adopt the pole piece 100 after this kind of mode welded not yielding, can reduce the inconsistent phenomenon while being welded to connect part, therefore assemble better effects if, be beneficial to automated production.And owing to having increased this positive pole screening glass 14 and negative pole screening glass 34, when welding, can not damage anode ear, negative electrode lug, making to change into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
embodiment 5
Make 100 electrokinetic cells according to above-described embodiment 1-4, the battery that the electrokinetic cell that title prepares is prewelding.
comparative example 1
According to making 100 electrokinetic cells in prior art; it is most of identical with embodiment 5; just there is no anodal screening glass 14 and negative pole screening glass 34; the process that the multilayer metal foil of the anodal screening glass 14 of no-trump and anode ear is welded as a whole, the process that also multilayer metal foil of no-trump negative pole screening glass 34 and negative electrode lug is welded as a whole simultaneously.Claim that the electrokinetic cell preparing is the battery without prewelding.
performance test
The electrokinetic cell without prewelding that the battery of the prewelding that above-mentioned employing the present embodiment 5 is prepared and comparative example 1 prepare carries out following performance test:
1, cell thickness test
Electrokinetic cell thickness without prewelding in the electrokinetic cell of prewelding and comparative example 1 in embodiment 5 after measurement changes into, relatively schematic diagram of its measurement result point as loose in thickness in Fig. 6.From this figure, can obviously find out, the electrokinetic cell that adopts the utility model to provide, its thickness is obviously thinner with respect to the existing battery without prewelding.
2, pole piece fold, dendrite test
From embodiment 5 and comparative example 1, respectively get 30 preweldings and the battery without prewelding, it is disassembled, measure the fold on positive plate 1, negative plate 3 and the dendrite on negative plate 3 and generate situation.
Fold appears at the projection striped on pole piece 100 positive and negative plate 3 coiling faces.Can, according to striped size and quantity, carry out grade marking to each face.
Dendrite appear at the greyness on negative plate 3 coiling faces.Can, according to speckle size and quantity, carry out grade marking to each face.
Because of fold and all specifically refinement measurements of dendrite, therefore they are respectively divided into 5 grades, higher grade, and fold and dendrite are more.By disassembling a large amount of pole pieces, set up the database of pole piece fold and dendrite.
For making those skilled in the art more understand electrokinetic cell that the utility model provides and the difference of comparative example 1 medium power battery performance, as shown in following table 1, table 2, fold and dendrite are carried out to classification below.
Table 1 pole piece fold distribution table of grading
Table 2 negative plate distribution of dendritic registration form
As shown in Figure 7, obviously, adopt the electrokinetic cell of the pre-postwelding of the utility model embodiment, its positive plate 1 fold grade is mainly distributed in grade 1, in grade 2, distributes on a small quantity.In comparative example 1 without the battery of prewelding fold grade be mainly distributed in grade 2, in grade 1,3, also have more distribution.Visible, the positive plate 1 fold grade in the utility model embodiment relatively positive plate 1 lower grade of fold in example.
As shown in Figure 8, adopt the electrokinetic cell of the pre-postwelding of the utility model embodiment, its negative plate 3 fold grades are generally distributed in grade 1,2,3, are mainly distributed in grade 2.In comparative example 1 without the battery of prewelding fold distribution of grades in grade 1-4, be mainly distributed in grade 3.Visible, in the utility model embodiment, relatively the negative plate 3 lower grades of fold in example for negative plate 3 fold grades.
Visible, to adopt the utility model embodiment to provide electrokinetic cell pole piece 100, the fold situation of its positive and negative plate 3 has clear improvement.
As shown in Figure 9, adopt the electrokinetic cell of the pre-postwelding of the utility model embodiment, its negative plate 3 dendrite grades are generally distributed in grade 1,2, are mainly distributed in grade 1.And in comparative example 1 without the dendrite distribution of grades of prewelding electrokinetic cell in grade 1-3, be mainly distributed in grade 2.Visible, in the utility model embodiment, relatively the negative plate 3 lower grades of dendrite in example for negative plate 3 dendrite grades, and dendrite phenomenon is able to obvious improvement.
3, cycle performance test
Get at random in the electrokinetic cell of prewelding in the utility model embodiment 5 and comparative example 1 without each 2 of the electrokinetic cell of prewelding, be labeled as respectively prewelding 1, prewelding 2, without prewelding 1, without prewelding 2 electrokinetic cells, under 23 DEG C of environment, carry out charge and discharge cycles test 2000 times by 1C.Its result as shown in figure 10, two curves of figure middle and lower part are without prewelding 1 with without the capacity surplus ratio curve of prewelding 2, two curves on top are the capacity surplus ratio curve that adopts prewelding 1 and prewelding 2, the electrokinetic cell that visible employing the utility model embodiment 5 provides, after charge and discharge cycles test 2000 times, its residual capacity rate is apparently higher than the electrokinetic cell in comparative example 1.Battery cycle life promotes.
In sum; the electrokinetic cell pole piece 100, electrokinetic cell and the manufacture method thereof that adopt the utility model embodiment to provide; owing to having increased anodal screening glass 14 and negative pole screening glass 34 in the pole piece 100 in its electrokinetic cell; in advance the multilayer metal foil of anode ear is welded as a whole by above-mentioned anodal screening glass 14, in advance negative electrode lug multilayer metal foil is welded as a whole by above-mentioned negative pole screening glass 34.So, pole piece 100 attenuation after anode ear, negative electrode lug pre-welding, more smooth, when soldered fitting, dislocation alleviates, and therefore assembles effectively, is beneficial to automated production; And changing into rear pole piece fold and dendrite all has obviously and alleviates, thereby battery performance is got a promotion.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (11)
1. an electrokinetic cell pole piece, is formed by the stacked rear coiling of positive plate, barrier film and negative plate; Described positive plate comprises positive electrode metallic foil and applies positive electrode thereon, described positive plate is provided with and applies the anode dressing district of described positive electrode and not dressing district of the positive pole of uncoated described positive electrode, and described positive pole not dressing district is arranged on the edge on described positive plate Width; Described negative plate comprises negative electrode metallic foil and applies negative material thereon, described negative plate is provided with and applies the negative pole dressing district of described negative material and not dressing district of the negative pole of uncoated described negative material, and described negative pole not dressing district is arranged on the edge on described negative plate Width; Described positive pole not dressing district and described negative pole does not all form the structure of multilayer metal foil in dressing district after reeling; It is characterized in that, described electrical core of power battery comprises anode ear and negative electrode lug, described anode ear comprises by not the reel multilayer metal foil and the anodal screening glass that form of dressing district of positive pole, and described negative electrode lug comprises by not the reel multilayer metal foil and the negative pole screening glass that form of dressing district of negative pole; The described positive pole multilayer metal foil that dressing district coiling does not form is welded as a whole by anodal screening glass; The described negative pole multilayer metal foil that dressing district coiling does not form is welded as a whole by negative pole screening glass; The width of described anodal screening glass is less than the width of the multilayer metal foil of anodal not dressing district coiling formation, and the width of described negative pole screening glass is less than the width of the negative pole multilayer metal foil that dressing district coiling forms.
2. electrokinetic cell pole piece according to claim 1; it is characterized in that; the width of described anodal screening glass or negative pole screening glass is 6-8mm, and the width of the described positive pole multilayer metal foil that dressing district coiling forms or the negative pole multilayer metal foil that dressing district coiling forms is 7-9mm.
3. electrokinetic cell pole piece according to claim 1; it is characterized in that; the length of described anodal screening glass is less than the length of the multilayer metal foil of anodal not dressing district coiling formation, and the length of described negative pole screening glass is less than the length of the negative pole multilayer metal foil that dressing district coiling forms.
4. electrokinetic cell pole piece according to claim 3; it is characterized in that; the length of described anodal screening glass or negative pole screening glass is 58-62mm, and the length of the described positive pole multilayer metal foil that dressing district coiling forms or the negative pole multilayer metal foil that dressing district coiling forms is 98-103mm.
5. electrokinetic cell pole piece according to claim 1, is characterized in that, the thickness of described anodal screening glass and negative pole screening glass is positive electrode metallic foil and negative electrode metallic foil thickness 10-20 times.
6. electrokinetic cell pole piece according to claim 1, is characterized in that, the thickness of described anodal screening glass and described negative pole screening glass is 100-250 micron.
7. according to the electrokinetic cell pole piece described in claim 1 to 6 any one, it is characterized in that, described anodal screening glass is identical with the material of positive electrode metallic foil, and described negative pole screening glass is identical with the material of described negative electrode metallic foil.
8. electrokinetic cell pole piece according to claim 7, is characterized in that, described anodal screening glass and positive electrode metallic foil are aluminium foil, and described negative pole screening glass and described negative electrode metallic foil are Copper Foil.
9. electrokinetic cell pole piece according to claim 1; it is characterized in that; described anodal screening glass and described positive pole not the solder joint number of dressing district welding are 2-4; described negative pole screening glass and described negative pole not the solder joint number of dressing district welding are 2-4, and the phase of solder joint of the solder joint of described anodal screening glass welding and the welding of described negative pole screening glass is and is symmetrically arranged for pole piece.
10. electrokinetic cell pole piece according to claim 1, is characterized in that, is coated with positive electrode on the two sides of described positive plate, is coated with negative material on the two sides of described negative plate.
11. 1 kinds of electrokinetic cells, comprise pole piece, electrolyte, housing and cover plate; Described electrolyte, pole piece are contained in the spatial accommodation of described housing and cover plate formation; It is characterized in that, described pole piece is the electrokinetic cell pole piece described in any one in claim 1-10; Described shell is provided with positive terminal, negative terminal, and described positive terminal is electrically connected to described anode ear by positive strap, and described negative terminal is electrically connected to described negative electrode lug by negative pole brace.
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| CN201320764019.4U CN203746957U (en) | 2013-11-28 | 2013-11-28 | Power battery pole core and power battery thereof |
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| CN201320764019.4U CN203746957U (en) | 2013-11-28 | 2013-11-28 | Power battery pole core and power battery thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234329A (en) * | 2017-05-25 | 2017-10-10 | 河南力旋科技股份有限公司 | A kind of pole ear welding method of soft pack cell |
| CN109148806A (en) * | 2018-07-18 | 2019-01-04 | 湖北锂诺新能源科技有限公司 | The cell polar ear and top cover connection method and connection structure of power battery |
-
2013
- 2013-11-28 CN CN201320764019.4U patent/CN203746957U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234329A (en) * | 2017-05-25 | 2017-10-10 | 河南力旋科技股份有限公司 | A kind of pole ear welding method of soft pack cell |
| CN109148806A (en) * | 2018-07-18 | 2019-01-04 | 湖北锂诺新能源科技有限公司 | The cell polar ear and top cover connection method and connection structure of power battery |
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