CN104681877B - A kind of electrokinetic cell pole piece, electrokinetic cell and preparation method thereof - Google Patents
A kind of electrokinetic cell pole piece, electrokinetic cell and preparation method thereof Download PDFInfo
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- CN104681877B CN104681877B CN201310617926.0A CN201310617926A CN104681877B CN 104681877 B CN104681877 B CN 104681877B CN 201310617926 A CN201310617926 A CN 201310617926A CN 104681877 B CN104681877 B CN 104681877B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical Kinetics & Catalysis (AREA)
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- Connection Of Batteries Or Terminals (AREA)
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Abstract
To overcome the pole piece of electrokinetic cell in the prior art directly to be welded with electrical connector, pole piece thickness is big, yielding, lug easily misplaces, it is unfavorable for assembling and automated production, pole piece fold is seriously and with dendrite be melted into simultaneously after, the problem of influenceing battery performance, the embodiments of the invention provide a kind of electrokinetic cell pole piece, electrokinetic cell and preparation method thereof.Wherein, electrokinetic cell pole piece, wind and formed after being stacked by positive plate, barrier film and negative plate；Also include positive pole screening glass and negative pole screening glass in pole piece, the multilayer metal foil of anode ear is welded as a whole by positive pole screening glass；The multilayer metal foil of negative electrode lug is welded as a whole by negative pole screening glass.In this way, its pole piece is thinning, it is more smooth；Pole piece is unlikely to deform simultaneously, and dislocation mitigates when welding connector, therefore assembling effect is good, beneficial to automated production；Anode ear, negative electrode lug will not be damaged during welding so that pole piece fold and dendrite have obvious mitigation after chemical conversion, so that battery performance gets a promotion.
Description
Technical field
The present invention relates to electrokinetic cell field, especially pole piece in electrokinetic cell.
Background technology
Public's environmental problem caused by the cost using fossil fuel and therefore is increasingly sensitive, and this, which allows to reduction, makes
With cost, the substitute for reducing the conventional trucks such as hybrid vehicle, the pure electric vehicle of environmental pressure act as what is become more and more important
Role.Although use cost that consumer and countries in the world are mixed power car and pure electric vehicle is cheap, environment-friendly advantage institute
Attract, they remain that hybrid vehicle and pure electric automobile can provide good power performance and high security
Energy.
Electrokinetic cell is increasingly auto vendor and Battery Plant as one of core component of hybrid electric vehicle and pure electric vehicle
Family is paid attention to, and due to high power capacity to be considered, high magnification, high security etc. require, the internal structure of existing electrokinetic cell with it is small
Battery of mobile phone of type etc. is slightly distinguished.
Existing electrokinetic cell generally comprises housing, cover plate, and the pole piece and electrolyte being contained in housing, cover plate, at this
Positive and negative electrode terminal is typically provided on cover plate, it insulate with cover plate.Wherein pole piece is folded successively by positive plate, barrier film, negative plate
Winding is postponed to be formed.And the edge on positive plate, negative plate on respective width is provided with non-dressing area, by this not
Dressing area is as positive and negative lug.After winding, positive and negative lug forms the structure of multilayer metal foil, the positive and negative electrode terminal
The inner is electrically connected on pole piece on the positive and negative lug of so-called multilayer metal foil by electric connecting sheet respectively.That is multilayer metal foil
The positive and negative lug of structure is directly welded on electric connecting sheet.
The mode that such a pole piece and electrical connector directly weld, pole piece thickness is big during welding, yielding, lug easily misplaces,
It is unfavorable for assembling and automated production；Meanwhile pole piece fold seriously and with dendrite, influences battery performance after chemical conversion.
The content of the invention
To overcome the pole piece of electrokinetic cell in the prior art directly to be welded with electrical connector, pole piece thickness is big, yielding, pole
Ear easily misplaces, and is unfavorable for assembling and automated production, while pole piece fold seriously and with dendrite, influences battery performance after chemical conversion
The problem of, the embodiments of the invention provide a kind of electrokinetic cell pole piece, electrokinetic cell and preparation method thereof.
On the one hand the embodiment of the present invention provides a kind of electrokinetic cell pole piece, after being stacked by positive plate, barrier film and negative plate
Winding is formed；
The positive plate includes positive electrode metallic foil and the positive electrode being coated on, and the positive plate is provided with coating institute
The non-dressing area of positive pole in the anode dressing area and the uncoated positive electrode of positive electrode is stated, the non-dressing area of positive pole is set
Edge on the positive plate width；
The negative plate includes negative electrode metallic foil and the negative material being coated on, and the negative plate is provided with coating institute
The non-dressing area of negative pole in the negative pole dressing area and the uncoated negative material of negative material is stated, the non-dressing area of negative pole is set
Edge on the negative plate width；
The structure of multilayer metal foil is respectively formed after the non-dressing area of positive pole and the non-dressing area of the negative pole are rolled, respectively
Positioned at the both ends of the pole piece as anode ear and negative electrode lug；
Wherein, in addition to positive pole screening glass and negative pole screening glass, by the positive pole screening glass by the more of the anode ear
Layer metal foil is welded as a whole；The multilayer metal foil of the negative electrode lug is welded as a whole by the negative pole screening glass.
On the other hand the embodiment of the present invention provides a kind of electrokinetic cell, including pole piece, electrolyte, housing and cover plate；Institute
State electrolyte, pole piece is contained in the receiving space that the housing and cover plate are formed；
The pole piece is the electrokinetic cell pole piece mentioned above；
The shell is provided with positive terminal, negative terminal, and the positive terminal is electrically connected to institute by positive strap
Integral anode ear is stated, the negative terminal is electrically connected to the integral negative electrode lug by negative straps.
The third aspect of the embodiment of the present invention provides a kind of preparation method of electrokinetic cell pole piece, comprises the following steps：
S1, preparation process：Obtain positive plate, barrier film, negative plate, positive pole screening glass and negative pole screening glass；
S2, winding steps：The positive plate, barrier film, negative plate are sequentially stacked, make the non-dressing area of the positive pole and described
The non-dressing area of negative pole is oppositely arranged；Then wind along its length, form the pole piece of rolled, make the non-dressing area of the positive pole and
The structure of multilayer metal foil is respectively formed after the non-dressing area of negative pole is rolled, and respectively positioned at the both ends of the pole piece as just
Lug and negative electrode lug；
S3, integrally molded step：The multilayer metal foil of the anode ear is welded as a whole by the positive pole screening glass；
The multilayer metal foil of the negative electrode lug is welded as a whole by the negative pole screening glass.
Fourth aspect of the embodiment of the present invention provides a kind of preparation method of electrokinetic cell, comprises the following steps：
SA, pole piece making step：The preparation method of the described electrokinetic cell pole piece provided according to above-described embodiment makes
The pole piece；
SB, encapsulation fluid injection step：The pole piece is loaded into housing with the receiving space of cover plate formation, then inwardly injecting
Electrolyte, obtain primary cell；
SC, chemical conversion sealing step：Sealed after the primary cell is melted into, is vented.
Using electrokinetic cell pole piece, electrokinetic cell and its manufacture method disclosed in the embodiment of the present invention, due in its power
Positive pole screening glass and negative pole screening glass are added in pole piece in battery, by above-mentioned positive pole screening glass in advance by the more of anode ear
Layer metal foil is welded as a whole, and negative electrode lug multilayer metal foil is welded as a whole in advance by above-mentioned negative pole screening glass.In this way, just
Pole piece after lug, negative electrode lug pre-welding is thinning, more smooth；Pole piece is unlikely to deform simultaneously, dislocation mitigation when welding connector, therefore
It is good to assemble effect, beneficial to automated production；Anode ear, negative electrode lug will not be damaged during welding so that pole piece pleat after chemical conversion
Wrinkle and dendrite have obvious mitigation, so that battery performance gets a promotion.
Brief description of the drawings
Fig. 1 is the electrokinetic cell pole piece decomposing schematic representation provided in the specific embodiment of the invention；
Fig. 2 is schematic perspective view after the electrokinetic cell pole piece winding provided in the specific embodiment of the invention；
Fig. 3 is the electrokinetic cell decomposing schematic representation provided in the specific embodiment of the invention；
Fig. 4 is the power pole piece Making programme figure provided in the specific embodiment of the invention；
Fig. 5 is the electrokinetic cell Making programme figure provided in the specific embodiment of the invention；
Fig. 6 is that the cell thickness scatterplot after the Battery formation made using the embodiment of the present invention 5 and comparative example 1 compares signal
Figure；
Fig. 7 is using the positive plate fold list for disassembling to obtain after the embodiment of the present invention 5 and the Battery formation of the making of comparative example 1
Value compares figure；
Fig. 8 is using the negative plate fold list for disassembling to obtain after the embodiment of the present invention 5 and the Battery formation of the making of comparative example 1
Value compares figure；
Fig. 9 is using the negative plate dendrite list for disassembling to obtain after the embodiment of the present invention 5 and the Battery formation of the making of comparative example 1
Value compares figure；
Figure 10 is that the capacity surplus ratio after the Battery formation made using the embodiment of the present invention 5 and comparative example 1 compares figure.
Wherein, 1, positive plate；2nd, barrier film；3rd, negative plate；4th, housing；5th, cover plate 5；11st, the non-dressing area of positive pole；12nd, positive pole
Dressing area；13rd, positive pole solder joint；14th, positive pole screening glass；31st, the non-dressing area of negative pole；32nd, negative pole dressing area；33rd, negative pole solder joint；
34th, negative pole screening glass；51st, positive terminal；52nd, negative terminal；53rd, positive pole insulating element；54th, negative insulation part；55th, positive pole
Connection sheet；56th, negative straps；100th, pole piece.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
Inventor has found that existing pole piece uses the side that positive plate, barrier film, negative plate are wound after being stacked in R＆D process
Formula, the both sides of the rolled pole piece after winding are respectively formed non-dressing area as positive and negative lug, then again that it is straight with electric connecting sheet
Welding is connect, with extracted current to electrode terminal.However, because the anode ear after winding, negative electrode lug are in the structure of multilayer metal foil,
Pole piece thickness is big during welding, yielding, lug easily misplaces, and is unfavorable for assembling and automated production；Meanwhile pole piece fold after chemical conversion
Seriously and with dendrite, battery performance is influenceed.The metal foil is easily hurt and the thickness of metal foil is very thin, during welding.Through
Cross the intellectual work of the present inventor and verified through test of many times, finally solve the problem.To have below to solution
Body illustrates.
Embodiment 1
This example will make specific explanations explanation to electrokinetic cell pole piece 100, shown in below figure 1, Fig. 2, the X that is marked in figure to
As positive plate 1, barrier film 2, the length direction of negative plate 3, Y-direction are then positive plate 1, barrier film 2, the width of negative plate 3.X
It is also the coiling direction of pole piece 100 to i.e. length direction.
Below will using lithium ion battery as electrokinetic cell exemplified by illustrate, this example provide electrokinetic cell pole piece 100,
Wind and formed after being stacked by positive plate 1, barrier film 2 and negative plate 3；
The positive plate 1 includes positive electrode metallic foil and the positive electrode being coated on, and the positive plate 1 is provided with coating
The non-dressing area 11 of the positive pole of the anode dressing area 12 of the positive electrode and the uncoated positive electrode, the non-dressing of positive pole
Area 11 is arranged on the edge on the width of positive plate 1；
The negative plate 3 includes negative electrode metallic foil and the negative material being coated on, and the negative plate 3 is provided with coating
The non-dressing area 31 of negative pole in the negative pole dressing area 32 and the uncoated negative material of the negative material, the non-dressing of negative pole
Area 31 is arranged on the edge on the width of negative plate 3；
The structure of multilayer metal foil is respectively formed after the non-dressing area 11 of positive pole and the non-dressing area 31 of the negative pole are rolled,
Respectively positioned at the both ends of the pole piece 100 as anode ear and negative electrode lug；
Wherein, in addition to positive pole screening glass 14 and negative pole screening glass 34, by the positive pole screening glass 14 by the positive pole
The multilayer metal foil of ear is welded as a whole；The multilayer metal foil of the negative electrode lug is welded as one by the negative pole screening glass 34
Body.
Fig. 1 gives the state before positive plate 1, barrier film 2, negative plate 3 are wound, and first three stacks together before winding,
Its septation 2 is located between positive plate 1, barrier film 2, negative plate 3.
By the X marked along its length in figure to being rolled up after being sequentially stacked due to positive plate 1, barrier film 2, negative plate 3
Around, for example in Fig. 1, the non-dressing area 11 of positive pole is arranged on the right hand edge of positive plate 1 along X to forward direction, and the non-dressing area 31 of negative pole is set
Put in the left hand edge of negative plate 3 along X to forward direction.In this way, its result is as shown in Fig. 2 may be such that the non-dressing area 11 of positive pole and negative pole
Non- dressing area 31 after the coiling, will be located at the both ends of the pole piece 100 respectively, i.e. the left and right sides in Fig. 2, as anode ear and
Negative electrode lug.
The main improvement of the embodiment of the present invention is after winding using positive pole screening glass 14 in advance by the multilayer of anode ear
Metal foil is welded as a whole, and the multilayer metal foil of negative electrode lug is welded as a whole in advance using negative pole screening glass 34.
The thickness of general positive electrode metallic foil is about 16 microns, and the thickness of negative electrode metallic foil is about 10 microns.What this example was mentioned
Positive pole screening glass 14, the sheet metal that negative pole screening glass 34 is rectangle, to make positive pole screening glass 14, negative pole screening glass 34 play protection
The effect of welding, it is proposed that the thickness of positive pole screening glass 14 and negative pole screening glass 34 is positive electrode metallic foil and negative electrode metallic foil thickness
10-20 times.For example the thickness of the positive pole screening glass 14 and the negative pole screening glass 34 is 100-250 microns, for example this example is adopted
A piece of thickness is used as 100 microns with 200 microns thick of positive pole screening glass 14 and the negative pole screening glass 34, during actual fabrication
Metal foil doubling forms, its positive pole screening glass 14, the length of negative pole screening glass 34, width can according to the non-dressing area 11 of positive pole,
The size in the non-dressing area 31 of negative pole determines.The size of positive pole screening glass 14 can be identical with the size of negative pole screening glass 34, also may be used
To differ, preferred size is identical.Such as this example use positive pole screening glass 14, the length of negative pole screening glass 34 is 62mm.It is right
It is not particularly limited in the material of positive pole screening glass 14, negative pole screening glass 34, various metals, alloy etc. can be used.Preferably, institute
State that positive pole screening glass 14 is identical with the material of positive electrode metallic foil, the material phase of the negative pole screening glass 34 and the negative electrode metallic foil
Together.Using the metal of material of the same race, be easier than different-metal material welding, effect it is more preferable.Such as the positive pole screening glass 14 with just
Pole metal foil is aluminium foil, and the negative pole screening glass 34 and the negative electrode metallic foil are copper foil.
As preferable mode, the solder joint that the positive pole screening glass 14 welds with the non-dressing area 11 of the positive pole is referred to as positive pole
Solder joint 13, its number are 2-4, and the solder joint that the negative pole screening glass 34 welds with the non-dressing area 31 of the negative pole is referred to as negative pole weldering
Point 33, its number are 2-4, and the solder joint that the positive pole screening glass 14 welds is relative with the solder joint that the negative pole screening glass 34 welds
In 100 symmetrical arrangement of pole piece.The so-called finger that is symmetrically arranged is symmetrical by the centre symmetry line shown in Fig. 2.
Positive plate 1 only can coat positive electrode in its one side, can also be coated with positive electrode on two face.It is negative
Pole piece 3 only can coat negative material in its one side, can also be coated with negative material on two face.Preferably, in institute
The two sides for stating positive plate 1 is coated with positive electrode, and is coated with negative material on the two sides of the negative plate 3.
Technology known in those skilled in the art can be used on positive plate 1, barrier film 2, negative plate 3, thus it is only right
It carries out simple example explanation.
Battery diaphragm 2 plays a part of preventing the direct contact short circuit of both positive and negative polarity in lithium ion battery.In order to improve battery
Security, the direct contact short circuit of both positive and negative polarity can be prevented at normal temperatures by not requiring nothing more than battery diaphragm 2, while also be required at high temperature
The battery diaphragm 2 can also prevent the direct contact short circuit of both positive and negative polarity.Because electrolyte is organic solvent system, thus need resistance to
The material of barrier film 2 of organic solvent, the general polyolefin porous membrane for using high-strength thin-film.Existing frequently-used battery diaphragm 2 wraps
Polyethylene, polypropylene etc. are included, Kynoar is also commonly used for barrier film 2.
Positive electrode include positive active material, conductive agent, the adhesive being bonded to positive electrode on positive electrode metallic foil,
Additive etc..Positive active material is a kind of layered mixed oxide of lithium and transition metal, and they are with certain specific
The active material of structure, reversible reaction can be carried out with lithium ion.For example such 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 can typically use carbon-based material, such as carbon black, carbon fiber and graphite, adhesive
Example includes fluorine resin and polyolefin compound such as PVDF（Kynoar）、PTFE（Polytetrafluoroethylene (PTFE)）、VDF-HFP-TFE
（Biasfluoroethylene-hexafluoropropylene-tetrafluoroethene）Copolymer and SBR（Butadiene-styrene rubber）Deng.
Negative material include negative electrode active material, conductive agent, the adhesive being bonded to negative material on negative electrode metallic foil,
Additive etc., wherein negative electrode active material are that can make lithium ion embedded and deintercalation carbon-based material, silicon systems material, nitrogen repeatedly
Compound, tin-based oxide, tin alloy, nanometer anode material, and some other intermetallic compounds etc..Carbon-based material includes
Native graphite, Delanium, carbonaceous mesophase spherules (MCMB), mesophase carbon fiber (MCF) etc..Adhesive include fluorine resin and
Polyolefin compound such as PVDF, PTFE, VDF-HFP-TFE copolymer and SBR etc..
Due to adding positive pole screening glass 14 and negative pole screening glass 34 in this example in pole piece 100, by positive pole screening glass 14
It is placed between anode ear and soldering tip, welds together the anode ear of multiple layer metal foil-like；And negative pole screening glass 34 is placed in negative
Between lug and soldering tip, make the negative pole lug welding of multiple layer metal foil-like together.In this way, shaping can be carried out to pole piece 100, make
Its is smooth, thinning；Simultaneously because anode ear, negative electrode lug are welded as a whole independently of one another in advance, pole piece 100 is unlikely to deform,
Inconsistent phenomenon during welded connections can be reduced, therefore assembling effect is more preferable, beneficial to automated production.And due to adding this just
Pole screening glass 14 and negative pole screening glass 34, anode ear, negative electrode lug will not be damaged during welding so that pole piece fold after chemical conversion
And dendrite has obvious mitigation, so that battery performance gets a promotion.
Embodiment 2
The embodiments of the invention provide a kind of electrokinetic cell, as shown in figure 3, including pole piece 100, electrolyte, housing and lid
Plate 5；The electrolyte, pole piece 100 are contained in the receiving space that the housing and cover plate 5 are formed；
The pole piece 100 is that described electrokinetic cell pole piece 100 is mentioned in embodiment 1；
The shell is provided with positive terminal 51, negative terminal 52, and the positive terminal 51 passes through the electricity of positive strap 55
The integral anode ear is connected to, the negative terminal 52 is electrically connected to the integral negative pole by negative straps 56
Ear.
Because pole piece 100 has specifically described in embodiment 1, therefore this example no longer does repeat specification.
The material of its housing typically uses box hat or aluminum hull, and it is the rectangular-shaped hollow-core construction of one end open；Cover plate 5 is right
The opening of the housing should be arranged on, is in a closed receiving space by the cover plate 5 and case weld.Pole piece 100 is advance
It is encapsulated in the receiving space.The positive terminal 51 that is set on the cover plate 5, negative terminal 52 with the mutually insulated of cover plate 5
Set, as shown in Figure 3, positive pole insulating element 53, the negative terminal 52 and cover plate are provided between the positive terminal 51 and cover plate 5
Negative insulation part 54 is provided between 5, positive terminal 51, negative terminal 52 are insulated with cover plate 5 respectively and are connected.
The positive terminal 51, negative terminal 52 can be the shapes such as screw, column or sheet.Positive terminal 51, negative pole
The inner of terminal 52 is stretched into housing, is then connected to anode ear, negative pole by positive strap 55, negative straps 56 respectively
Ear；Positive terminal 51, the outer end of negative terminal 52 outside battery, so can provide connecing for power supply through cover plate 5 for load
Mouthful.
Liquid injection hole is additionally provided with cover plate 5（Not shown in figure）, electrolyte is passed through into the note after cell package to facilitate
In fluid apertures injection battery.Liquid injection hole is sealed by steel ball or other sealing parts after fluid injection, chemical conversion, it is complete to form inside battery
The space of totally-enclosed.
The electrolyte of electrokinetic cell of the present invention is the mixed solution of the chain acid esters containing lithium salts and ring-type acid esters.Lithium salts bag
Include lithium perchlorate (LiClO4), lithium hexafluoro phosphate (LiPF6), LiBF4 (LiBF4), chlorine lithium aluminate, lithium halide, fluorohydrocarbon base
Fluorine oxygen lithium phosphate and fluorohydrocarbon base Sulfonic Lithium etc., one of them or its mixture can be used.The example of chain acid esters includes carbonic acid
Dimethyl ester (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 it is other it is fluorine-containing,
Sulfur-bearing or the chain organosilane ester containing unsaturated bond, one of them or its mixture can be used.The example of ring-type acid esters includes
Ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (γ-BL), sultone and its
Its fluorine-containing, sulfur-bearing or the ring-type organosilane ester containing unsaturated bond, one of them or its mixture can be used.
Certainly, part, spacer ring can guide positive strap 55, negative pole to connect also including spacer ring etc. typically in electrokinetic cell
Contact pin 56 passes through, and prevents internal short-circuit of battery, and this is known to those skilled in the art, smaller with the degree of association of the present invention, no
Repeat again.
Due to lithium ion battery disclosed in this example, pole piece 100 is set to be welded with positive strap 55 and negative straps 56
Before, positive pole screening glass 14 and negative pole screening glass 34 are added in pole piece 100, likewise it is possible to shaping is carried out to pole piece 100,
Make its smooth, thinning, simultaneously because anode ear, negative electrode lug are welded as a whole independently of one another in advance.Welded using this kind of mode
Pole piece 100 after connecing is unlikely to deform, and can reduce inconsistent phenomenon during welded connections, therefore assembling effect is more preferable, beneficial to automatic
Metaplasia is produced.And anode ear, negative electrode lug will not be caused due to adding the positive pole screening glass 14 and negative pole screening glass 34, during welding
Injury so that pole piece fold and dendrite have obvious mitigation after chemical conversion, so that battery performance gets a promotion.
Embodiment 3
This example discloses a kind of preparation method of electrokinetic cell pole piece 100, as shown in figure 4, comprising the following steps：
S1, preparation process：Obtain positive plate 1, barrier film 2, negative plate 3, positive pole screening glass 14 and negative pole screening glass 34；
S2, winding steps：The positive plate 1, barrier film 2, negative plate 3 are sequentially stacked, make the non-dressing area 11 of the positive pole
It is oppositely arranged with the non-dressing area 31 of the negative pole；Then wind along its length, form the pole piece 100 of rolled, make it is described just
The structure of multilayer metal foil is respectively formed after Ji Wei dressing area 11 and the non-dressing area 31 of the negative pole are rolled, and respectively positioned at described
The both ends of pole piece 100 are as anode ear and negative electrode lug；
S3, integrally molded step：The multilayer metal foil of the anode ear is welded as one by the positive pole screening glass 14
Body；The multilayer metal foil of the negative electrode lug is welded as a whole by the negative pole screening glass 34.
In step sl, its main purpose for follow-up winding and it is integrally molded prepare, on positive plate 1, barrier film 2, negative
The preparation method of pole piece 3 is known to those skilled in the art, for example the preparation method of positive plate 1 is generally following process：From
The aluminium foil of suitable size is cut in the aluminium foil of entire volume as positive electrode metallic foil；By positive active material, additive, adhesive, lead
The making such as electric agent obtain anode sizing agent；Then the processes such as tabletting, drying are carried out positive plate 1 is made.
Similarly, similar with the preparation method of positive plate 1, the preparation method of negative plate 3 is generally following process：From entire volume
Copper foil in cut the copper foil of suitable size as negative electrode metallic foil；By negative electrode active material, additive, adhesive, conductive agent
Cathode size is obtained Deng making；Then the processes such as tabletting, drying are carried out positive plate 1 is made.
After barrier film 2 typically buys the barrier film 2 of the entire volumes such as polyethylene film, polypropylene screen or composite porous film, cut from above
The barrier film 2 of suitable size.
Positive pole screening glass 14, negative pole screening glass 34 use the rectangular patch metal of suitable size.Such as positive pole screening glass 14
Using the thicker aluminium foil of thickness ratio positive electrode metallic foil, it can cut into slices from the aluminium foil of entire volume and obtain, and negative pole screening glass 34 is using thick
The degree copper foil thicker than negative electrode metallic foil, it can cut into slices from the copper foil of entire volume and obtain.
Coating anode sizing agent and during cathode size, it is necessary to which the edge on width in positive electrode metallic foil reserves positive pole
Non- dressing area 11, and edge on width in negative electrode metallic foil is needed reserve the non-dressing area 31 of negative pole, typically may be used
In coating slurry, to be directly not coated by above-mentioned zone；Or after overall coating slurry, it would be desirable to be arranged to the non-dressing of positive pole
Area 11 and the region in the non-dressing area 31 of negative pole, wipe positive electrode and negative material above off, to form the non-dressing area 11 of positive pole
With the non-dressing area 31 of negative pole.
In step S2, as shown in figure 1, so-called make the non-dressing area 11 of the positive pole and the non-dressing area 31 of the negative pole relative
Setting, i.e., both non-same sides are set, for example in Fig. 1, the non-dressing area 11 of positive pole is arranged on the right hand edge of positive plate 1 along X to forward direction,
And the non-dressing area 31 of negative pole is arranged on the left hand edge of negative plate 3 along X to forward direction.In this way, it may be such that the non-dressing area 11 of positive pole and bear
Ji Wei dressing area 31 after the coiling, will be located at the both ends of the pole piece 100 respectively, as anode ear and negative electrode lug.
Above-mentioned steps S1, S2 are known to those skilled in the art, therefore repeat no more.
Step S3 is the technique that relatively conventional preparation method newly increases in this example, and the pole piece 100 of winding is fixed
It is good, then take a positive pole screening glass 14 to compress positioned at the non-dressing area 11 of positive pole of the side of pole piece 100（That is anode ear）, then with weldering
Head welds to positive pole screening glass 14, i.e., positive pole screening glass 14 is placed between the non-dressing area 11 of positive pole and soldering tip, similarly,
A negative pole screening glass 34 is taken to compress positioned at the non-dressing area 31 of negative pole of the opposite side of pole piece 100（That is negative electrode lug）, then with soldering tip pair
Negative pole screening glass 34 is welded, i.e., positive pole screening glass 14 is placed between the non-dressing area 11 of positive pole and soldering tip and welded, will
Negative pole screening glass 34 is placed between the non-dressing area 31 of negative pole and soldering tip and welded.Weld positive pole screening glass 14 and the non-dressing of positive pole
Process between the process in area 11 and welding negative pole screening glass 34 and the non-dressing area 31 of negative pole can be carried out successively, can also be simultaneously
Carry out.During welding, as needed, its solder joint is preferably provided to 2-4.In this way, the multilayer metal foil of anode ear is welded as
One, and the multilayer metal foil of negative electrode lug is welded as a whole.
Using this example provide the preparation method of electrokinetic cell pole piece 100, similarly, due to winding obtain pole piece 100 after,
Integrally molded step is added, the multilayer metal foil of positive pole screening glass 14 and anode ear is welded as a whole, and negative pole is protected
The multilayer metal foil of bluff piece 34 and negative electrode lug is welded as a whole.Pole piece 100 after being welded using this kind of mode is unlikely to deform, and can be subtracted
Inconsistent phenomenon during few welded connections, therefore assembling effect is more preferable, beneficial to automated production.And protected due to adding the positive pole
Bluff piece 14 and negative pole screening glass 34, anode ear, negative electrode lug will not be damaged during welding so that pole piece fold and branch after chemical conversion
Crystalline substance has obvious mitigation, so that battery performance gets a promotion.
Embodiment 4
This example provides a kind of preparation method of electrokinetic cell, as shown in figure 5, comprising the following steps：
SA, the making step of pole piece 100：The preparation method of electrokinetic cell pole piece 100 according to above-described embodiment 3 makes
The pole piece 100；
SB, encapsulation fluid injection step：The pole piece 100 is loaded in the receiving space that housing and cover plate 5 formed, then inwardly
Electrolyte is injected, obtains primary cell；
SC, chemical conversion sealing step：Sealed after the primary cell is melted into, is vented.
Step SA has been elaborated in embodiment 3, is repeated no more.SB, SC are known to those skilled in the art,
Wherein, existing technology can be used on techniques such as encapsulation, fluid injection, chemical conversion, exhaust, sealings.The present invention is not carried out to it
Limitation.Therefore also no longer describe in detail.
Similarly, in the electrokinetic cell preparation method provided due to this example, the improved preparation method of pole piece 100 is included,
After winding obtains pole piece 100, integrally molded step is added, the multilayer metal foil of positive pole screening glass 14 and anode ear is welded
One is connected in, and the multilayer metal foil of negative pole screening glass 34 and negative electrode lug is welded as a whole.After being welded using this kind of mode
Pole piece 100 is unlikely to deform, and can reduce inconsistent phenomenon during welded connections, therefore assembling effect is more preferable, beneficial to automated production.
And anode ear, negative electrode lug will not be damaged due to adding the positive pole screening glass 14 and negative pole screening glass 34, during welding, make
Pole piece fold and dendrite have obvious mitigation after must being melted into, so that battery performance gets a promotion.
Embodiment 5
100 electrokinetic cells are made according to above-described embodiment 1-4, the electrokinetic cell being prepared is referred to as the battery of prewelding.
Comparative example 1
According to 100 electrokinetic cells are made in the prior art, it is most of same as Example 5, and simply no positive pole is protected
The process that the multilayer metal foil of bluff piece 14 and negative pole screening glass 34, no-trump positive pole screening glass 14 and anode ear is welded as a whole, together
When also no-trump negative pole screening glass 34 and negative electrode lug the process that is welded as a whole of multilayer metal foil.Claim the electrokinetic cell being prepared
For the battery without prewelding.
Performance test
Battery and comparative example 1 to the above-mentioned prewelding being prepared using the present embodiment 5 be prepared without prewelding
Electrokinetic cell carries out following performance test：
1st, cell thickness is tested
Electrokinetic cell thickness without prewelding in the electrokinetic cell and comparative example 1 of prewelding in embodiment 5 after measurement chemical conversion, its
Thickness scatterplot comparison schematic diagram in measurement result such as Fig. 6.From the figure it will be evident that using provided in an embodiment of the present invention dynamic
Power battery, its thickness are significantly thinner relative to the battery of existing no prewelding.
2nd, pole piece fold, dendrite test
30 preweldings and the battery without prewelding are respectively taken from embodiment 5 and comparative example 1, it is disassembled, measure positive pole
Piece 1, the fold on negative plate 3 and the generation situation of the dendrite on negative plate 3.
Fold is to appear in the projection striped on the winding face of 100 positive and negative plate of pole piece 3.Can be according to striped size and number
Amount, grade marking is carried out to each face.
Dendrite is to appear in the greyness on the winding face of negative plate 3.Each face can be carried out according to speckle size and quantity
Grade is given a mark.
Because fold and dendrite can not specifically refine measurement, therefore they are respectively divided into 5 grades, higher grade, fold and dendrite
It is more.By disassembling substantial amounts of pole piece, the database of pole piece fold and dendrite is established.
To make those skilled in the art more understand electrokinetic cell provided in an embodiment of the present invention and power electric in comparative example 1
The difference of pond performance, as shown in table 1 below, table 2, fold and dendrite are classified below.
The pole piece fold of table 1 is distributed table of grading
The negative plate distribution of dendritic registration form of table 2
As shown in Figure 7, it is clear that, it is main using the electrokinetic cell of the pre- postwelding of the embodiment of the present invention, its fold grade of positive plate 1
It is distributed in grade 1, is distributed on a small quantity in grade 2.And then fold grade is mainly distributed on grade to the battery without prewelding in comparative example 1
In 2, also there is more distribution in grade 1,3.It can be seen that in the fold grade of positive plate 1 relatively example in the embodiment of the present invention
The fold lower grade of positive plate 1.
As shown in figure 8, using the electrokinetic cell of the pre- postwelding of the embodiment of the present invention, its fold grade of negative plate 3 is typically distributed
In grade 1,2,3, it is mainly distributed in grade 2.And in comparative example 1 battery without prewelding then fold distribution of grades in grade 1-
In 4, it is mainly distributed in grade 3.It can be seen that the negative plate 3 in the embodiment of the present invention in the fold grade of negative plate 3 relatively example
Fold lower grade.
It can be seen that using electrokinetic cell pole piece 100 provided in an embodiment of the present invention, the fold situation of its positive and negative plate 3 has bright
It is aobvious to improve.
As shown in figure 9, using the electrokinetic cell of the pre- postwelding of the embodiment of the present invention, its dendrite grade of negative plate 3 is typically distributed
In grade 1,2, it is mainly distributed in grade 1.And the dendrite distribution of grades without prewelding electrokinetic cell is in grade 1- in comparative example 1
In 3, it is mainly distributed in grade 2.It can be seen that the negative plate 3 in the embodiment of the present invention in the dendrite grade of negative plate 3 relatively example
Dendrite lower grade, and dendrite phenomenon is obviously improved.
3rd, cycle performance is tested
It is random to take in the embodiment of the present invention 5 each 2 of the electrokinetic cell without prewelding in the electrokinetic cell of prewelding and comparative example 1,
Be respectively labeled as prewelding 1, prewelding 2, without prewelding 1, without the electrokinetic cell of prewelding 2, carry out charge and discharge cycles by 1C under 23 DEG C of environment
Test 2000 times.Its result is as shown in Figure 10, and two curves of figure middle and lower part are the capacity surplus ratio without prewelding 1 and without prewelding 2
Curve, two curves on top are the capacity surplus ratio curve using prewelding 1 and prewelding 2, it is seen that are carried using the embodiment of the present invention 5
The electrokinetic cell of confession, after charge and discharge cycles are tested 2000 times, its residual capacity rate is apparently higher than the power electric in comparative example 1
Pond.Battery cycle life is lifted.
In summary, using electrokinetic cell pole piece 100, electrokinetic cell and its manufacture method provided in an embodiment of the present invention,
Due to adding positive pole screening glass 14 and negative pole screening glass 34 in the pole piece 100 in its electrokinetic cell, protected by above-mentioned positive pole
The multilayer metal foil of anode ear is welded as a whole by bluff piece 14 in advance, by above-mentioned negative pole screening glass 34 in advance by negative electrode lug multilayer
Metal foil is welded as a whole.In this way, the pole piece 100 after anode ear, negative electrode lug pre-welding is thinning, and it is more smooth, weld wrong during connector
Position mitigates, therefore assembling effect is good, beneficial to automated production；And pole piece fold and dendrite have obvious mitigation after being melted into, so as to
Battery performance is set to get a promotion.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of electrokinetic cell pole piece, wind and formed after being stacked by positive plate, barrier film and negative plate；
The positive plate includes positive electrode metallic foil and the positive electrode being coated on, and it is described just that the positive plate is provided with coating
The non-dressing area of the positive pole of the anode dressing area of pole material and the uncoated positive electrode, the non-dressing area of positive pole are arranged on institute
State the edge on positive plate width；
The negative plate includes negative electrode metallic foil and the negative material being coated on, and the negative plate, which is provided with, coats described bear
The non-dressing area of the negative pole of the negative pole dressing area of pole material and the uncoated negative material, the non-dressing area of negative pole are arranged on institute
State the edge on negative plate width；
The structure of multilayer metal foil is respectively formed after the non-dressing area of positive pole and the non-dressing area of the negative pole are rolled, is located at respectively
The both ends of the pole piece are as anode ear and negative electrode lug；
Characterized in that, also include positive pole screening glass and negative pole screening glass, by the positive pole screening glass by the anode ear
Multilayer metal foil is welded as a whole；The multilayer metal foil of the negative electrode lug is welded as a whole by the negative pole screening glass.
2. electrokinetic cell pole piece according to claim 1, it is characterised in that the positive pole screening glass and negative pole screening glass
Thickness is 10-20 times of positive electrode metallic foil and negative electrode metallic foil thickness.
3. electrokinetic cell pole piece according to claim 1, it is characterised in that the positive pole screening glass and negative pole protection
The thickness of piece is 100-250 microns.
4. the electrokinetic cell pole piece according to any one in claim 1-3, it is characterised in that the positive pole screening glass with
The material of positive electrode metallic foil is identical, and the negative pole screening glass is identical with the material of the negative electrode metallic foil.
5. electrokinetic cell pole piece according to claim 4, it is characterised in that the positive pole screening glass and positive electrode metallic foil are equal
For aluminium foil, the negative pole screening glass and the negative electrode metallic foil are copper foil.
6. electrokinetic cell pole piece according to claim 1, it is characterised in that the positive pole screening glass does not apply with the positive pole
The solder joint number for expecting area's welding is 2-4, and the solder joint number of negative pole screening glass dressing area welding non-with the negative pole is 2-4
Individual, the solder joint of the positive pole screening glass welding is with the solder joint of negative pole screening glass welding relative to the symmetrical cloth of pole piece
Put.
7. electrokinetic cell pole piece according to claim 1, it is characterised in that be coated with just on the two sides of the positive plate
Pole material, negative material is coated with the two sides of the negative plate.
8. a kind of electrokinetic cell, including pole piece, electrolyte, housing and cover plate；The electrolyte, pole piece be contained in the housing and
In the receiving space that cover plate is formed；
Characterized in that, the pole piece is the electrokinetic cell pole piece described in any one in claim 1-7；
The shell is provided with positive terminal, negative terminal, and the positive terminal is electrically connected to described one by positive strap
The anode ear of body, the negative terminal are electrically connected to the integral negative electrode lug by negative straps.
9. the preparation method of any one electrokinetic cell pole piece in a kind of 1-7, it is characterised in that comprise the following steps：
S1, preparation process：Obtain positive plate, barrier film, negative plate, positive pole screening glass and negative pole screening glass；
S2, winding steps：The positive plate, barrier film, negative plate are sequentially stacked, make the non-dressing area of the positive pole and the negative pole
Non- dressing area is oppositely arranged；Then wind along its length, form the pole piece of rolled, make the non-dressing area of the positive pole and described
The structure of multilayer metal foil is respectively formed after the non-dressing area of negative pole is rolled, and respectively positioned at the both ends of the pole piece as anode ear
And negative electrode lug；
S3, integrally molded step：The multilayer metal foil of the anode ear is welded as a whole by the positive pole screening glass；Pass through
The multilayer metal foil of the negative electrode lug is welded as a whole by the negative pole screening glass.
10. a kind of preparation method of electrokinetic cell, it is characterised in that comprise the following steps：
SA, pole piece making step：The preparation method of electrokinetic cell pole piece according to claim 9 makes the pole piece；
SB, encapsulation fluid injection step：The pole piece is loaded into housing with the receiving space of cover plate formation, then inwardly injecting electrolysis
Liquid, obtain primary cell；
SC, chemical conversion sealing step：Sealed after the primary cell is melted into, is vented.
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| CN110021775B (en) * | 2018-01-08 | 2021-04-20 | 比亚迪股份有限公司 | Pole core, battery unit, battery module and car |
| WO2019183855A1 (en) * | 2018-03-28 | 2019-10-03 | 深圳前海优容科技有限公司 | Lithium battery and cell and electrode plate thereof |
| CN114552136A (en) | 2020-11-20 | 2022-05-27 | 北京小米移动软件有限公司 | Power supply module and manufacturing method thereof |
| CN113451712B (en) * | 2021-07-29 | 2024-04-09 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| WO2023050197A1 (en) * | 2021-09-29 | 2023-04-06 | 宁德时代新能源科技股份有限公司 | Battery cell and method and system for manufacturing same, and battery and electric device |
| CN114701569B (en) * | 2022-04-12 | 2023-07-18 | 三一技术装备有限公司 | Vehicle and chassis structure |
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| CN101521294A (en) * | 2008-10-10 | 2009-09-02 | 比亚迪股份有限公司 | Power battery for electric vehicle |
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