CN108417887A - A kind of high power type lithium ion cell and preparation method thereof - Google Patents
A kind of high power type lithium ion cell and preparation method thereof Download PDFInfo
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- CN108417887A CN108417887A CN201810490970.2A CN201810490970A CN108417887A CN 108417887 A CN108417887 A CN 108417887A CN 201810490970 A CN201810490970 A CN 201810490970A CN 108417887 A CN108417887 A CN 108417887A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- 238000004804 winding Methods 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000006258 conductive agent Substances 0.000 claims description 8
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 239000007773 negative electrode material Substances 0.000 claims description 4
- 239000007774 positive electrode material Substances 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000010287 polarization Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000011883 electrode binding agent Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
-
- 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
-
- 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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to battery technology fields, more particularly to a kind of high power type lithium ion cell, including packaging bag, the positive plate and negative plate being placed in packaging bag, the isolation film being arranged between positive plate and negative plate and the electrolyte for being injected into packaging bag, positive plate, isolation film and negative plate are wound together forms core, positive plate has the uncoated area of anode, negative plate has the uncoated area of cathode, the uncoated area of anode folds to form the first folding part, the uncoated area of cathode folds to form the second folding part, the height of first folding part and the second folding part is no more than the height of core, the uncoated area of anode is welded with anode ear, the uncoated area of cathode is welded with negative electrode lug.The present invention can reduce the polarization resistance of battery core, improve the ability of battery core quick charge and discharge, while also maximizing the space availability ratio for promoting battery core, reduce the loss of the volume energy density of battery core.In addition, the invention also discloses a kind of preparation methods of high power type lithium ion cell.
Description
Technical field
The invention belongs to battery technology fields, and in particular to a kind of high power type lithium ion cell and preparation method thereof.
Background technology
Nowadays, with the rapid development of the sharp increase of population and social economy, resource and the energy are increasingly short, environmental protection
It is paid more and more attention, the exploitation and saving of the energy become an important topic of the world today.The energy be human society exist and
The basis of development, more and more continually experience energy plaque is weary and environmental pollution is endangered for the today's society based on fossil energy
Machine.Meanwhile along with the arriving of information-based cyberage, energy source use form is changing, renewable, pollution-free,
Small-sized discrete removable high-performance power supply demand rapid growth.Each state is all greatly developing green, high efficient secondary battery.Lithium from
Sub- battery as a kind of new secondary battery, have energy density and power density are big, operating voltage is high, it is light-weight, small,
It has extended cycle life, the advantages that safety is good, environmentally protective, it is dynamic in portable electronics, electric tool, large-scale energy storage, electronic traffic
Power power supply etc. has broad application prospects.
There are the losses of the energy density of battery for existing lithium ion battery greatly, and battery polarization internal resistance is higher, cannot be satisfied height
The requirement of energy density high-power battery, first, Chinese patent literature disclose a kind of lithium ion battery (publication number：CN
105514350 A) comprising：Anode pole piece, including plus plate current-collecting body and the dry compacting of coating be set on plus plate current-collecting body and
Including positive electrode active materials, positive conductive agent, positive electrode binder positive diaphragm；Cathode pole piece, including negative current collector and painting
Cloth drying compacting is set on negative current collector and includes the negative electrode film of negative electrode active material, cathode conductive agent, negative electrode binder
Piece；Isolation film；Electrolyte and packaging film.Optimize coat weight, compacted density and the positive and negative anodes capacity ratio of positive and negative electrode,
To achieve the purpose that improve the ability of battery core quick charge.In addition, to disclose a kind of lithium ion battery more for Chinese patent literature
Lug pole piece preparation method, multi-pole lug lithium ion battery pole group preparation method and battery (publication number：104600250 A of CN), packet
It includes：It rolled after gamut even spread active slurry on a current collector, cut into required width pole piece；The pole piece edge after cutting
At least two rectangle clear areas are scraped, in rectangle clear area soldering polar ear, and in tab welding position Double-face adhesive protection band.It is making
Standby electrode when, scrape at least two tab welding positions in electrode edge, reduce battery core internal resistance, the power for improving battery core is special
Property.Above-mentioned scheme reduces the energy density loss of battery to a certain extent, reduces battery polarization internal resistance, but this is several
At least there is also following defects for kind scheme：First, the space availability ratio of battery core is not high, and second, volume energy density is relatively low, causes
The practicability of structure is not strong.
Invention content
It is an object of the present invention to：In view of the deficiencies of the prior art, a kind of high power type lithium ion cell is provided, with
The polarization resistance of battery core can be reduced, improves the ability of battery core quick charge and discharge, while also maximizing the sky for promoting battery core
Between utilization rate and improve battery core energy density.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of high power type lithium ion cell, including packaging bag, the positive plate that is placed in the packaging bag and negative plate, setting
Isolation film between the positive plate and the negative plate and the electrolyte for being injected into the packaging bag, the positive plate, institute
It states isolation film and the negative plate winds form core together, the positive plate has the uncoated area of anode, the negative plate tool
There are the uncoated area of cathode, the uncoated area of anode to fold to form the first folding part, the uncoated area of cathode folds to form
The height of two-fold portion, first folding part and second folding part is no more than the height of the core, the anode
Uncoated area is welded with anode ear, and the uncoated area of cathode is welded with negative electrode lug.Increase the uncoated area of anode and cathode is not coated with
Area is covered, battery core space is helped to fully utilize, and by the first folding part of increase and the second folding part, saves space,
Reaching reduces the polarization resistance of battery core, so that transmission distance of the electronics on pole piece is equal to the width of battery pole piece, it is fast to improve battery core
The ability that speed is charged and discharged realizes the energy density for maximizing the space availability ratio for promoting battery core and improving battery core.
As a kind of a kind of improvement of high power type lithium ion cell of the present invention, first folding part and described
Second folding part is disposed as multilayered structure.First folding part and the second folding part are set as multilayered structure, reduce the pole of battery core
Change internal resistance.
As a kind of a kind of improvement of high power type lithium ion cell of the present invention, first folding part and described
The height of second folding part is the height 1/4-4/5 of the core.By the High definition of the first folding part and the second folding part
Range, it is more than the height of core to prevent the height of the first folding part and the second folding part, leads to battery core surface irregularity, Wu Faying
With, while preventing the height of the first folding part and the second folding part too small, cause the first folding part that can not be welded on anode ear
Together, the second folding part can not be together with negative pole lug welding.
As a kind of a kind of improvement of high power type lithium ion cell of the present invention, first folding part and described
The height of second folding part is the height 3/5 of the core.The height of the first folding part and the second folding part is further limited,
Do not only reach battery core surfacing, at the same the first folding part can together with anode ear seamless welding, the second folding part can with it is negative
Lug seamless welding is together.
As a kind of a kind of improvement of high power type lithium ion cell of the present invention, the height of first folding part
More than or equal to the height of second folding part.The height of first folding part might be less that the height of the second folding part, only
Meet the height 1/4-4/5 no more than core, is conducive to simplify production technology, improves preparation efficiency.
As a kind of a kind of improvement of high power type lithium ion cell of the present invention, first folding part and described
Four angles of the second folding part are fillet, and the radius of the fillet is 1mm-10mm.The four of first folding part and the second folding part
A angle is set as fillet, prevents the first folding part and the angle of the second folding part from puncturing shell, leads to battery leakage.
The second object of the present invention is to additionally provide a kind of preparation method of high power type lithium ion cell, including as follows
Step：
1) prepared by positive plate：Positive electrode active materials, positive conductive agent and positive alite paste are mixed into coating material, it then will be described
Coating material is coated in plus plate current-collecting body, prepares the positive plate for having positive coating area and the uncoated area of anode；
2) prepared by negative plate：Negative electrode active material, cathode conductive agent and cathode alite paste are mixed into coating material, it then will be described
Coating material is coated in negative current collector, prepares the negative plate for having cathode coating area and the uncoated area of the cathode；
3) it winds：The uncoated area of anode and the uncoated area of the cathode are placed in the opposite direction, and in the positive plate
The isolation film is placed with the negative plate, they are then wound into the core so that described in described core one end is exposed
The uncoated area of anode, the other end expose the uncoated area of cathode；
4) prewelding：The uncoated area of anode described in multilayer by winding welds together, and cathode described in the multilayer by winding is uncoated
Area welds together；
5) it folds：The uncoated area of anode described in multilayer by winding is folded into first folding part, described in the multilayer by winding
The uncoated area of cathode is folded into second folding part, and the height of first folding part and second folding part is no more than
The height of the core；
6) high power type lithium ion cell finally is made by encapsulation, drying, fluid injection, degasification and partial volume.
In the preparation method of the present invention, step 3) makes core one end expose the uncoated area of anode, and the other end exposes cathode not
Coating area contributes to the uncoated area of anode and cathode is uncoated distinguishes, prevents the uncoated area of anode and the uncoated area of cathode
Being in direct contact in battery leads to battery explosion, and step 4) makes transmission distance of the electronics on pole piece equal to the width of battery pole piece
Degree, improves the ability of battery core quick charge and discharge, and step 5) provides that the first folding part and the second folding part are no more than core
Highly, it is more than the height of core to prevent the height of the first folding part and the second folding part, leads to battery core surface irregularity, Wu Faying
With, while preventing the height of the first folding part and the second folding part too small, cause the first folding part that can not be welded on anode ear
Together, the second folding part can not be together with negative pole lug welding.
As a kind of a kind of improvement of the preparation method of high power type lithium ion cell of the present invention, the cathode is not
Coating area includes the uncoated area of the first cathode and the uncoated area of the second cathode that is connected to the uncoated area of the first cathode, described
The uncoated area of second cathode is occupied in the end of the negative plate, before step 3), negative pole lug welding is negative described second
Extremely uncoated area, and paste insulation gummed paper in weld and anode ear is welded on first folding part before step 6), and
Insulation gummed paper is pasted in weld, after executing the step, the negative electrode lug can be made consistent with anode ear direction.Increase by second
The uncoated area of cathode makes the direction of negative electrode lug be not necessarily to depending on the direction in the uncoated area of cathode together with negative pole lug welding,
It realizes that negative electrode lug is consistent with anode ear direction, the space of battery is efficiently used, while welding negative electrode lug before step 3), to production
Requirement reduce, be conducive to improve prepare efficiency.
As a kind of a kind of improvement of the preparation method of high power type lithium ion cell of the present invention, the anode is not
Coating area includes the first uncoated area of anode and the second positive uncoated area for be connected to first anode uncoated area, described
The second uncoated area of anode is occupied in the end of the positive plate, and before step 3), anode ear is being welded on described second just
Extremely uncoated area, and insulation gummed paper is pasted in weld, before step 6), by negative pole lug welding in second folding part, and
Insulation gummed paper is pasted in weld, after executing the step, the negative electrode lug can be made consistent with anode ear direction.Increase by second
The uncoated area of anode welds together with anode ear, and the direction of anode ear is made to be not necessarily to depending on the direction in the uncoated area of anode,
It realizes that negative electrode lug is consistent with anode ear direction, the space of battery is efficiently used, while welding anode ear before step 3), to production
Requirement reduce, be conducive to improve prepare efficiency.
As a kind of a kind of improvement of the preparation method of high power type lithium ion cell of the present invention, in step 5)
In, anode ear is welded on first folding part, while by negative pole lug welding in second folding part, and paste in weld
Insulate gummed paper.Anode ear and negative electrode lug are welded after folding, are simplified production process, are prevented due to not welded just before winding
Lug or negative electrode lug lead to battery failure.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of positive plate and negative plate in the present invention.
Fig. 3 is the structural schematic diagram after present invention winding.
Fig. 4 is the structural schematic diagram after the present invention folds.
Fig. 5 is the positive plate of embodiment 8 and the structural schematic diagram of negative plate in the present invention.
Fig. 6 is the structural schematic diagram of embodiment 9 in the present invention.
Wherein：1- positive plates；2- negative plates；3- core；11- anodes coating area；The uncoated area of 12- anodes；13- anodes
Ear；The uncoated area of the first anodes of 121-；The uncoated area of the second anodes of 122-：21- cathode coating area；The uncoated area of 22- cathode；
23- negative electrode lugs；The uncoated area of the first cathode of 221-；The uncoated area of the second cathode of 222-；The first folding parts 120-；The second foldings of 220-
Folded portion.
Specific implementation mode
Some vocabulary has such as been used to censure specific components in specification and claim.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is used as the mode for distinguishing component, but is used as the criterion of differentiation with the difference of component functionally.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer in acceptable error range, those skilled in the art can solve technology within a certain error range
Problem basically reaches technique effect.
In the description of the present invention, it is to be understood that, term "upper", "lower", "front", "rear", "left", "right", level "
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of the description present invention and
Simplify description, does not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration
And operation, therefore be not considered as limiting the invention.
In invention unless specifically defined or limited otherwise, the arts such as term " installation ", " connected ", " connection ", " fixation "
Language shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connects, and can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
Below in conjunction with attached drawing, invention is further described in detail, but not as a limitation of the invention.
Embodiment 1
As shown in Fig. 1 ~ 4, a kind of high power type lithium ion cell, including packaging bag, the positive plate 1 that is placed in packaging bag and negative
Pole piece 2, the isolation film being arranged between positive plate 1 and negative plate 2 and the electrolyte for being injected into packaging bag, positive plate 1, isolation film
It is wound together with negative plate 2 and forms core 3, there is positive plate 1 the uncoated area 12 of anode, negative plate 2 to have the uncoated area of cathode
22, the uncoated area 12 of anode, which folds, forms the first folding part 120, and the uncoated area 22 of cathode, which folds, forms the second folding part 220, the
The height of one folding part 120 and the second folding part 220 is no more than the height of core 3, and positive uncoated area 12 is welded with anode
Ear 13, the uncoated area of cathode 22 are welded with negative electrode lug 23.Increase the uncoated area 12 of anode and the uncoated area 22 of cathode, contributes to handle
Battery core space fully utilizes, and by increasing the first folding part 120 and the second folding part 220, saves space, reach reduction
The polarization resistance of battery core, make electronics on pole piece transmission distance be equal to battery pole piece width, improve battery core quick charge and
The ability of electric discharge, compared to the scheme that electrode edge scrapes two tab welding positions, the present invention reduces by 50% polarization resistance.
Preferably, the first folding part 120 and the second folding part 220 are disposed as multilayered structure, the first folding part 120 and
The height in two-fold portion 220 is the height 1/4 of core 3.The folding times in the uncoated area 12 of anode and the uncoated area of cathode 22
It is four times, so that the first folding part 120 and the height of the second folding part 220 is reached minimum value, prevent the first folding part 120 and second
The height of folding part 220 is too small, causes the first folding part 120 that can not weld together with anode ear 13,220 nothing of the second folding part
Method welds together with negative electrode lug 23.
Preferably, four angles of the first folding part 120 and the second folding part 220 are fillet, and the radius of fillet is 1mm.The
Four angles of one folding part 120 and the second folding part 220 are set as fillet, and radius of corner is set as minimum value, prevents the first folding
The radius of corner of folded 120 and second folding part 220 of portion is too small, punctures shell, leads to battery leakage.
Embodiment 2
As different from Example 1：The height of the present embodiment the first folding part 120 and the second folding part 220 is the height of core 3
Degree 4/5.The folding times in the uncoated area 12 of anode and the uncoated area of cathode 22 are twice, to make the first folding part 120 and the second folding
The height in folded portion 220 reaches maximum value, and it is more than the height of core 3 to prevent the height of the first folding part 120 and the second folding part 220
Degree, leads to battery core surface irregularity, can not apply.
Other structures are same as Example 1, and which is not described herein again.
Embodiment 3
As different from Example 1：The height of the present embodiment the first folding part 120 and the second folding part 220 is the height of core 3
Degree 3/5.The folding times in the uncoated area 12 of anode and the uncoated area of cathode 22 are three times, to make the first folding part 120 and the second folding
The height in folded portion 220 reaches median, does not only reach battery core surfacing, while the first folding part 120 can be with 13 nothing of anode ear
Seam weld is connected together, and the second folding part 220 can be together with 23 seamless welding of negative electrode lug.
Other structures are same as Example 1, and which is not described herein again.
Embodiment 4
As different from Example 1：The height of the first folding part of the present embodiment 120 is greater than or equal to the height of the second folding part 220
Degree.The height of first folding part 120 might be less that the height of the second folding part 220, as long as meeting the height no more than core 3
, be conducive to simplify production technology, improve preparation efficiency.
Other structures are same as Example 1, and which is not described herein again.
Embodiment 5
As different from Example 1：The radius of the present embodiment fillet is 10mm.Radius of corner is set as maximum value, prevents first
The radius of corner of folding part 120 and the second folding part 220 is excessive, and the area of the first folding part 120 and the second folding part 220 is excessive
It reduces, influences the polarization resistance of battery core.
Other structures are same as Example 1, and which is not described herein again.
Embodiment 6
As different from Example 1：The radius of the present embodiment fillet is 5mm.The radius for further limiting fillet, prevents cornering machine
The parameter of incompatible range class inputs, and also reaching prevents the radius of corner of the first folding part 120 and the second folding part 220 too small,
Shell is punctured, battery leakage is caused.
Other structures are same as Example 1, and which is not described herein again.
Embodiment 7
As shown in Fig. 1 ~ 4, a kind of preparation method of any high power type lithium ion cell of embodiment 1 ~ 6, including walk as follows
Suddenly：
1) prepared by positive plate：Positive electrode active materials, positive conductive agent and positive alite paste are mixed into coating material, it then will coating
Material is coated in plus plate current-collecting body, prepares the positive plate 1 for having positive coating area 11 and the uncoated area of the anode 12；
2) prepared by negative plate：Negative electrode active material, cathode conductive agent and cathode alite paste are mixed into coating material, it then will coating
Material is coated in negative current collector, prepares the negative plate 2 for having cathode coating area 21 and the uncoated area of the cathode 22；
3) it winds：The uncoated area of the uncoated area 12 of anode and cathode 22 is placed in the opposite direction, and in positive plate 1 and negative plate
2 place isolation film, they are then wound into core 3 so that the uncoated area 12 of anode is exposed in 3 one end of core, and the other end exposes
The uncoated area of cathode 22；
4) prewelding：The uncoated area of the multilayer of winding anode 12 is welded together, the uncoated area of the multilayer cathode of winding 22 is welded
It is connected together；
5) it folds：The uncoated area of the multilayer of winding anode 12 is folded into the first folding part 120, the multilayer cathode of winding is not coated with
It covers area 22 and is folded into the second folding part 220, the height of the first folding part 120 and the second folding part 220 is no more than the height of core 3
Degree；
6) high power type lithium ion cell finally is made by encapsulation, drying, fluid injection, degasification and partial volume.
In above-mentioned steps, the uncoated area 22 of cathode include the uncoated area 221 of the first cathode and with the uncoated area of the first cathode
The uncoated areas 222 of the second cathode of 221 connections, the uncoated area of the second cathode 222 are occupied in the end of negative plate 2, in step 3)
Before, negative electrode lug 23 is welded on the uncoated area 222 of the second cathode, and insulation gummed paper is pasted in weld, it, will before step 6)
Anode ear 13 is welded on the first folding part 120, and pastes insulation gummed paper in weld, after executing the step, can make negative electrode lug 23
With anode ear 13 towards consistent.Increase the uncoated area 222 of the second cathode with negative electrode lug 23 to weld together, makes the court of negative electrode lug 23
To without depending on the direction in the uncoated area of cathode 22, realizing that negative electrode lug 23 and anode ear 13 towards consistent, efficiently use electricity
The space in pond, while negative electrode lug 23 is welded before step 3), the requirement to production reduces, and is conducive to improve the efficiency prepared.
It should be noted that：In the manufacturing method of the present invention, step 3) makes 3 one end of core expose the uncoated area of anode
12, the other end exposes cathode uncoated area 22, helps the uncoated area 12 of anode and the uncoated area of cathode 22 to separate, prevents just
Extremely uncoated area 12 and the uncoated area of cathode 22 are in direct contact in battery leads to battery explosion, and step 4) makes electronics on pole piece
Transmission distance be approximately equal to the width of battery pole piece, improve the ability of battery core quick charge and discharge, step 5) provides the first folding
The height of folded 120 and second folding part 220 of portion is no more than the height of the core 3, prevents the first folding part 120 and second from folding
The height in portion 220 is more than the height of core 3, leads to battery core surface irregularity, can not apply, while preventing the first folding part 120
It is too small with the height of the second folding part 220, cause the first folding part 120 that can not weld together with anode ear 13, second folds
Portion 220 can not weld together with negative electrode lug 23.
Embodiment 8
As shown in figure 5, as different from Example 7：The uncoated area 12 of the present embodiment anode includes the first positive uncoated area 121
And the uncoated area 122 of the second anode being connected to the first positive uncoated area 121, the second positive uncoated area 122 is occupied in just
Anode ear 13 is welded on the second uncoated area 122 of anode, and paste and insulate in weld by the end of pole piece 1 before step 3
Negative electrode lug 23 is welded on the second folding part 220, and paste insulation gummed paper in weld, executes the step by gummed paper before step 6
After rapid, negative electrode lug 23 and anode ear 13 can be made towards consistent.Increase by the second uncoated area 122 of anode to be welded on anode ear 13
Together, so that the direction of anode ear 13 is not necessarily to depending on the direction in positive uncoated area 12, realize negative electrode lug 23 and anode ear 13
Towards the space of battery, while welding anode ear 13 before step 3) unanimously, is efficiently used, the requirement to production reduces, favorably
In the efficiency for improving preparation.
Other steps are same as Example 7, and which is not described herein again.
Embodiment 9
As shown in fig. 6, as different from Example 7：The present embodiment is welded on the first folding part in step 5), by anode ear 13
120, while negative electrode lug 23 is welded on the second folding part 220, and paste insulation gummed paper in weld.Anode ear is welded after folding
13 and negative electrode lug 23, simplify production process, prevents since welding anode ear 13 or negative electrode lug 23 lead to battery not before winding
Failure.
Other steps are same as Example 7, and which is not described herein again.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in above-mentioned specific implementation mode, every those skilled in the art exist
Made any conspicuously improved, replacement or modification all belongs to the scope of protection of the present invention on the basis of the present invention.This
Outside, although having used some specific terms in this specification, these terms are merely for convenience of description, not to the present invention
Constitute any restrictions.
Claims (10)
1. a kind of high power type lithium ion cell, including packaging bag, the positive plate (1) and negative plate that are placed in the packaging bag
(2), the isolation film being arranged between the positive plate (1) and the negative plate (2) and the electrolyte for being injected into the packaging bag,
It is characterized in that：The positive plate (1), the isolation film and the negative plate (2) wind form core (3) together, it is described just
There is pole piece (1) the uncoated area (12) of anode, the negative plate (2) to have the uncoated area of cathode (22), the anode uncoated
Area (12), which folds, forms the first folding part (120), and the uncoated area of cathode (22), which folds, forms the second folding part (220), institute
The height for stating the first folding part (120) and second folding part (220) is no more than the height of the core (3), it is described just
Extremely uncoated area (12) is welded with anode ear (13), and the uncoated area of cathode (22) is welded with negative electrode lug (23).
2. a kind of high power type lithium ion cell as described in claim 1, it is characterised in that：First folding part (120)
It is disposed as multilayered structure with second folding part (220).
3. a kind of high power type lithium ion cell as described in claim 1, it is characterised in that：First folding part (120)
Height with second folding part (220) is the height 1/4-4/5 of the core (3).
4. a kind of high power type lithium ion cell as claimed in claim 3, it is characterised in that：First folding part (120)
Height with second folding part (220) is the height 3/5 of the core (3).
5. a kind of high power type lithium ion cell as described in claim 1, it is characterised in that：First folding part (120)
Height be greater than or equal to second folding part (220) height.
6. a kind of high power type lithium ion cell as described in claim 1, it is characterised in that：First folding part (120)
Four angles with second folding part (220) are fillet, and the radius of the fillet is 1mm-10mm.
7. a kind of preparation method of claim 1-6 any one of them high power type lithium ion cells, which is characterized in that including
Following steps：
1) prepared by positive plate：Positive electrode active materials, positive conductive agent and positive alite paste are mixed into coating material, it then will be described
Coating material is coated in plus plate current-collecting body, prepares the positive plate for having positive coating area (11) and the uncoated area of anode (12)
(1)；
2) prepared by negative plate：Negative electrode active material, cathode conductive agent and cathode alite paste are mixed into coating material, it then will be described
Coating material is coated in negative current collector, prepares the negative plate for having cathode coating area (21) and the uncoated area of the cathode (22)
(2)；
3) it winds：The uncoated area of anode (12) is placed in the opposite direction with the uncoated area of the cathode (22), and in institute
It states positive plate (1) and the negative plate (2) places the isolation film, they are then wound into the core (3) so that described
The uncoated area of anode (12) is exposed in core (3) one end, and the other end exposes the uncoated area of cathode (22)；
4) prewelding：The uncoated area (12) of anode described in multilayer by winding welds together, and cathode described in the multilayer by winding is not
Coating area (22) welds together；
5) it folds：The uncoated area (12) of anode described in multilayer by winding is folded into first folding part (120), by winding
The uncoated area of cathode described in multilayer (22) is folded into second folding part (220), first folding part (120) and described
The height in two-fold portion (220) is no more than the height of the core (3)；
6) high power type lithium ion cell finally is made by encapsulation, drying, fluid injection, degasification and partial volume.
8. a kind of preparation method of high power type lithium ion cell as claimed in claim 7, it is characterised in that：The cathode is not
Coating area (22) includes the uncoated area of the first cathode (221) and is connected to the uncoated area of the first cathode (221) second negative
Extremely uncoated area (222), the uncoated area of the second cathode (222) occupy in the end of the negative plate (2), step 3) it
Before, negative electrode lug (23) is welded on the uncoated area of the second cathode (222), and the insulation gummed paper is pasted in weld, in step
It is rapid 6) before, anode ear (13) is welded on first folding part (120), and insulation gummed paper is pasted in weld, executes the step
After rapid, the negative electrode lug (23) can be made consistent with the anode ear (13) direction.
9. a kind of preparation method of high power type lithium ion cell as claimed in claim 7, it is characterised in that：The anode is not
Coating area (12) include the first uncoated area (121) of anode and be connected to the uncoated area (121) of first anode second just
Extremely uncoated area (122), the uncoated area (122) of second anode occupy in the end of the positive plate (1), step 3) it
Before, anode ear (13) is welded on the uncoated area (122) of second anode, and insulation gummed paper is pasted in weld, in step 6)
Before, negative electrode lug (23) is welded on second folding part (220), and insulation gummed paper is pasted in weld, execute the step it
Afterwards, the negative electrode lug (23) can be made consistent with the anode ear (13) direction.
10. a kind of preparation method of high power type lithium ion cell as claimed in claim 7, it is characterised in that：In step 5)
In, anode ear (13) is welded on first folding part (120), while negative electrode lug (23) is welded on second folding part
(220), and in weld insulation gummed paper is pasted.
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| CN201810490970.2A CN108417887A (en) | 2018-05-21 | 2018-05-21 | A kind of high power type lithium ion cell and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173000A (en) * | 2022-06-28 | 2022-10-11 | 江苏正力新能电池技术有限公司 | Electrode assembly, preparation method of electrode assembly, battery and battery module |
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Effective date of registration: 20220113 Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zenergy Battery Technologies Co.,ltd Address before: 523000 Dalang Town, Dongguan, Guangdong province Xiangshan Pine Hill Village Xiangshan Industrial Park Jiayuan Road No. 9 Applicant before: DONGGUAN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: JIANGSU TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: SHENZHEN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Application publication date: 20180817 |