CN102842700A - Poly lithium battery structure with high capacity and high output ratio power - Google Patents
Poly lithium battery structure with high capacity and high output ratio power Download PDFInfo
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- CN102842700A CN102842700A CN2012102879230A CN201210287923A CN102842700A CN 102842700 A CN102842700 A CN 102842700A CN 2012102879230 A CN2012102879230 A CN 2012102879230A CN 201210287923 A CN201210287923 A CN 201210287923A CN 102842700 A CN102842700 A CN 102842700A
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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
Abstract
The invention mainly discloses a poly lithium battery structure with high capacity and high output ratio power. The poly lithium battery structure comprises a plurality of single battery pole pieces, wherein all single battery pole pieces are equally divided into a plurality of small single piece groups, polar lugs, which have same polarity, of single battery pole pieces in the same single piece group, are reshaped by pressing and clamped by a positive clamp and a negative clamp through welding; positive auxiliary electrode aluminum conductive metal sheets and polytetrafluoroethylene clapboard sheets are stacked between two adjacent groups; clamps with same polarity in each group are connected by an output connector in a unified manner; and the poly lithium battery structure is finally formed by packaging an aluminum-plastic packaging film. The poly lithium battery structure disclosed by the invention breaks through the bottleneck of application of high output ratio power and high current discharge of the traditional polymer lithium ion battery. According to the poly lithium battery structure, the accumulation of the polarization effect and the heat effect of the high-capacity battery under the condition of high output ratio power and high current discharge is greatly improved, the working temperature of the battery is reduced by 30 percent and the output capacity of the battery is improved by 38 percent than those of the traditional polymer lithium ion battery structure, the polarization effect of the battery is reduced and the temperature of a thermal runway platform is improved by 80-95 DEG C.
Description
Technical field
The present invention relates to the height output specific power heavy-current discharge applied technical field of polymer Li-ion battery, relevant with the high output of a kind of big capacity specific power poly-lithium battery structure especially.
Background technology
Along with the development of modernized society, polymer Li-ion battery is with its excellent performance condition industry energy demand and application more and more widely.But in the high output of big capacity specific power heavy-current discharge applied technical field; For monomer high capacity cell with harsh instructions for use (discharge temp is low, discharge capacity than high) operation; Because its lug sheet metal cross section output nominal current density and monomer high capacity cell are worked under asymmetric condition in the working current density of height output specific power heavy-current discharge; Must cause inside battery pole piece group polarization condition abominable; And it is too fast to cause the inside battery thermal effect to assemble; It is low excessively to cause battery capacity under this condition of work, to export electric energy, and when work temperature too high, seriously influence the normal use of polymer Li-ion battery at the high output of battery specific power heavy-current discharge.Become the bottleneck that the high output of restriction polymer Li-ion battery specific power heavy-current discharge is used.
Can know that from the electrochemical principle analysis high capacity cell is under height output specific power heavy-current discharge condition, discharge-rate is high more, and the polarization phenomena of inside battery are just serious more.The polarization of transition causes the inside battery local current densities excessive, and too big current density makes the character of the active material (negative electrode) in the battery change even cause the cathode material lattice to subside, thereby makes irreversible capacity increase, and capacity produces decay.And this vicious circle, the destruction of part material crystals can cause the even more serious polarization phenomena of inside battery, and so circulation is gone down, and battery performance also can quicken to descend.Therefore system adjusts (both positive and negative polarity connector, auxiliary electrode, polytetrafluoroethylene partition, the corresponding isolation of pole piece divide into groups) distribution of current density of inside battery; The consistency of euqalizing current density is to improve battery high-rate discharge ability and the effective way that improves the high capacity cell cycle performance.
Export under the specific power heavy-current discharge continuous operation condition at height for high-rate polymer lithium ion battery; The polarization phenomena of its battery must be very serious; And since battery the increase along with local current densities, its polarization uniformity coefficient destroys, polarization phenomena are very serious.
As shown in Figure 1, constitute at the single pole piece composition of traditional traditional polymer lithium ion battery and to comprise: a slice copper collector sheet metal 10, two aluminium collector sheet metals 20, two positive electrode films 30, two slices 20 solid electrolyte barrier films 40, two negative material films 50.Two aluminium collector sheet metals 20 are positioned at outermost; Inwardly stack a slice positive electrode film 30, a slice 20 solid electrolyte barrier films 40, a slice negative material film 50 in each aluminium collector sheet metal 20 inboard successively, between two negative material films 50, stack a slice copper collector sheet metal 10.Above-mentioned pole piece forms monolithic battery pole piece 60 as shown in Figure 2 through after encapsulating, and forms positive pole ear 71 and negative lug 72 on copper collector sheet metal 10 and the aluminium collector sheet metal 20 after the extension hot pressing respectively.
Referring to Fig. 3, Fig. 4, the cell group is to be stacked by some monolithic battery pole pieces 60 to form again, the pressing shaping in groups of the lug of the same polarity of all monolithic battery pole pieces 60, and exporting electric conductor 80 then, to be clipped on the whole lug welding fixing.As shown in Figure 5 again, the positive and negative conductive metal sheet 90 of welding forms the cell complete structure on the output electric conductor 80, and is as shown in Figure 6 at last, adopts aluminum-plastic packaged back to form traditional polymer lithium ion battery 100.
Because when the pressing of lug integral body, lug quantity is more, make that outside lug bending amplitude is big; Cause lug sheet metal water conservancy diversion area limited and asymmetric with the current density of high output specific power heavy-current discharge; When this condition discharge, internal resistance increases, and temperature sharply raises; Polarization phenomena are serious, must cause cycle performance of battery rapid deterioration phenomenon serious.
In order to address the above problem, the inventor designs the high output of a kind of big capacity specific power poly-lithium battery structure, and this case produces thus.
Summary of the invention
Main purpose of the present invention provides the high output of a kind of big capacity specific power poly-lithium battery structure, effectively reduces the temperature of polymer Li-ion battery group heavy-current discharge, improves cycle life, effectively improves the service behaviour of battery pack high-multiplying power discharge.
In order to achieve the above object, the present invention realizes through following technical scheme:
The high output of a kind of big capacity specific power poly-lithium battery structure; Comprise some monolithic battery pole pieces, all monolithic battery pole pieces are divided into some monolithics group, the lug pressing shaping of the same polarity of monolithic battery pole piece in the same monolithic group; By positive and negative electrode anchor clamps welding clamping; Stacked anodal auxiliary electrode aluminium conductive metal sheet and polytetrafluoroethylene dividing plate thin slice between the adjacent set, each organizes the anchor clamps of same polarity by unified corresponding connection of out connector, and final plastic-aluminum packaging film encapsulation forms.
Described anodal auxiliary electrode aluminium conductive metal sheet and anodal anchor clamps are overall structure.
After the described plastic-aluminum packaging film encapsulation, around this structure cell, has the insulating radiation typing colloid layer of the moulding of being heating and curing.
Described out connector comprises insulation board and conductive metal sheet, draws conductive metal sheet on each anchor clamps, and the conductive metal sheet of same polarity is fixed on the same insulation board.
Described insulation board is inserted fixing tool after adopting PPC macromolecule resin material and conductive metal sheet to be separated by, and the synthetic processing mode of hot pressing forms the out connector overall structure.
Described insulation board adopts PPC macromolecule resin material and conductive metal sheet typing to be fixed on the injection mo(u)lding of mould mesohigh, forms the connector overall structure.
Described conductive metal sheet, its anodal raffinal sheet metal that adopts, negative pole adopts high-purity copper or nickel sheet metal, and its THICKNESS CONTROL is the 0.01-0.5 millimeter.
Described insulation board THICKNESS CONTROL is the 0.01-0.6 millimeter.
Described polytetrafluoroethylene dividing plate sheet thickness is the 0.1-0.4 millimeter.
It is the silver coating of 0.005-0.015 millimeter that described conductive metal sheet, its surface all have thickness.
After adopting such scheme, the present invention has many beneficial effects:
The present invention solves that pole piece group both positive and negative polarity in traditional high capacity polymer lithium ion battery is concentrated and because too much, the blocked up and long welding difficulty of bringing of edge pole piece water conservancy diversion metal pole piece of pole piece lamination number; Shake is disconnected easily; Welding current is too big, and frequency is too high, makes the problem of welding pole piece damaged.The serious pole piece group puncture short that causes.Adopt the structure of multilayer lug out connector, the sheet metal number of plies divides into groups to make that the pole piece lamination is counted attenuate, edge pole piece water conservancy diversion metal pole piece shortens from the solder joint center corresponding to pole piece, not damaged and punch-through, and the operation rate of finished products improves 60%.
Simultaneously, use the thin spacer of high temperature-resistant acid-resistant polytetrafluoroethylene to make the thermal effect of battery be uniformly distributed with the great polarization performance that improves battery.
Owing to adopt the grouping effect of high capacity cell pole piece group, effectively improved the conforming screening rate of battery pole piece, thereby the consistency manufacturing yields of battery is improved.
In a word; The technical scheme that the present invention proposes can effectively break through the bottleneck that the high output of restriction polymer Li-ion battery specific power heavy-current discharge is used, and significantly improves in the polarity effect of the condition of work battery of the high output of battery specific power heavy-current discharge and the accumulation of thermal effect; Battery operated temperature traditional polymer lithium ion battery structure on year-on-year basis will descend 30%; Output capacity improves 38%, and the battery polarization effect reduces, and the thermal runaway platform improves the 80-95 degree.
Description of drawings
Fig. 1 is that the pole piece composition of traditional polymer lithium ion battery constitutes sketch map;
Fig. 2 is the monolithic battery pole piece sketch map of traditional polymer lithium ion battery;
Fig. 3 is the battery pole piece group sketch map of traditional polymer lithium ion battery;
Fig. 4 is traditional polymer lithium ion battery pressing shaping and a conductive metal sheet formation sketch map in groups;
Fig. 5 is the positive and negative in groups lug conductive metal sheet of a traditional polymer lithium ion battery complete structure sketch map;
Fig. 6 is the aluminum-plastic packaged back of a traditional polymer lithium ion battery sketch map;
Fig. 7 stacks sketch map for divided battery pole piece in the preferred embodiment of the present invention;
Fig. 8 is the pressing shaping sketch map in groups of divided battery pole piece in the preferred embodiment of the present invention;
Fig. 9 places in battery and the connected mode sketch map for anodal auxiliary electrode aluminium conductive metal sheet in the preferred embodiment of the present invention;
Figure 10 lays structural representation for polytetrafluoroethylene dividing plate thin slice in the preferred embodiment of the present invention;
Figure 11 is for containing the monolithic group structure sketch map of anodal auxiliary electrode aluminium conductive metal sheet, polytetrafluoroethylene dividing plate thin slice in the preferred embodiment of the present invention;
Figure 12 is a plurality of monolithic group structure sketch mapes in the preferred embodiment of the present invention;
Figure 13 is each packet assembling sketch map in the preferred embodiment of the present invention;
Figure 14 is a plurality of monolithic group out connector scheme of installation in the preferred embodiment of the present invention;
Figure 15 is with the sketch map after aluminum-plastic packaged in the preferred embodiment of the present invention;
Figure 16 solidifies the back structural representation for preferred embodiment of the present invention.
Embodiment
In conjunction with Fig. 7 to Figure 16, preferred embodiment of the present invention is explained further details.
The high output of a kind of big capacity specific power poly-lithium battery structure includes the monolithic group 2 that at least two monolithic battery pole pieces 1 as shown in Figure 7 are constituted.
Monolithic battery pole piece 1 internal structure is identical with monolithic battery pole piece structure in the traditional polymer lithium ion battery group, neatly stacks according to order, and the positive pole ear 11 on each monolithic battery pole piece 1 is all neat corresponding with negative lug 12.
In a monolithic group 2,, as shown in Figure 8 with positive pole ear 11 and negative lug 12 pressing shaping respectively.Because adopt the form of dividing into groups, pole piece lamination number is few, thickness is little, and the lug distortion of edge pole piece is little.
In conjunction with Fig. 9, the edge of a monolithic group 2 stacks anodal auxiliary electrode aluminium conductive metal sheet 3, and its shape and size are identical with monolithic battery pole piece 1.The position of corresponding positive pole ear 11 on anodal auxiliary electrode aluminium conductive metal sheet 3 extends to form anodal anchor clamps 31 simultaneously, and anodal anchor clamps 31 are clamped the positive pole ear 11 of pressing shaping.Like Figure 10, shown in Figure 11; Stacked polytetrafluoroethylene dividing plate thin slice 4 again in the outside of anodal auxiliary electrode aluminium conductive metal sheet 3; Make polytetrafluoroethylene dividing plate thin slice 4 between adjacent two monolithic groups 2; The thickness of polytetrafluoroethylene dividing plate thin slice 4 is preferably between the 0.1-0.4 millimeter, like Figure 12, shown in Figure 13, on negative lug 12, adopts cathode 32 clampings then too.
After the marshalling, adopt out connector 4 that the lug group between each group is formed unified the connection between each group, shown in figure 14, out connector 5 mainly comprises insulation board 51 and conductive metal sheet 52.Conductive metal sheet 52 is fixedly drawn from each anchor clamps welding, it is separated by fixing by insulation board 51 then.
Out connector 5 mainly can be accomplished by two kinds of technology modes; One of which insulation board 51 uses sheet PPC (poly (propylene carbonate)) macromolecular material; After being separated by with each conductive metal sheet 52, insert fixing tool, the synthetic processing mode of hot pressing is accomplished anodal out connector 5 overall structures of multilayer.The anodal out connector overall structure of multilayer negative pole out connector 4 overall structures and multilayer in like manner technology forms.
Its two insulation boards, 51 same use PPC macromolecule resin materials and 52 typings of each conductive metal sheet are fixed on the injection mo(u)lding of mould mesohigh, accomplish anodal out connector 5 overall structures of multilayer.The anodal out connector overall structure of multilayer negative pole out connector 5 overall structures and multilayer in like manner technology forms.Above-mentioned two kinds of moulding process forms all need not mechanical connection and reinforce and weld the interface combination problem that solves.
Wherein conductive metal sheet 52, and positive pole ear is used to be the raffinal sheet metal, and negative pole is high-purity copper or nickel sheet metal, and its THICKNESS CONTROL is the 0.01-0.5 millimeter.Be coated with a silver coating on the surface of conductive metal sheet 52 in addition, its thickness is the 0.005-0.015 millimeter.Insulation board 51 THICKNESS CONTROL are the 0.01-0.6 millimeter.
After out connector 4 installations, adopt plastic-aluminum packaging film 6 encapsulation at outer surface, form cell, like Figure 15.The attribute that traditional polymer lithium ion battery profile consistency is poor in order to overcome at last, battery edge intensity low and radiating condition is not enough; In mold cavity according to design code battery overall dimension; Adopt resin, fire retardant, Graphene, thermal diffusion transduction agent, bonding agent, curing agent, mix insulation colloid; And colloid injected the cured film chamber with levelling in the chamber, the moulding that is heating and curing forms insulating radiation typing colloid layer 7.Cured layer thickness is consistent with battery centre gauge, amplifies 3～4 millimeters solidifying and setting along the battery periphery.After forming battery pack, the battery external form is in full accord.
Through the moulding of engineering plastics die cavity sizing and solidifying, peripheral intensity effectively strengthens, and has good thermal conductivity and stable heat dissipating layer.This technology has promptly solved the conforming problem of battery external form, strengthens bulk strength and thermal diffusivity simultaneously again.The time of being heating and curing is 0.5～1 hour, and the normal temperature cure time is 3～4 hours.
The present invention compares with traditional handicraft; Effectively reduce internal resistance 30%, pole piece consistency matching rate improves 85% in the battery, and the temperature rise of battery plus-negative plate end cell lowers 15%; Battery and battery pack are worked under height output specific power large current load 15-20C multiplying power technical conditions, and output capacity improves 36%.The battery polarization phenomenon reduces greatly, and the thermal effect accumulation rate reduces by 23% than original.As after the special-shaped electric core series connection of 20AH capacity, maximum temperature (last 20 seconds) is 72 ℃ under 2 minutes 45 seconds (cut-ff voltage 2.9V) situation of 20C multiplying power discharging, and mean temperature effectively reduces the temperature of polymer lithium ion power cell group heavy-current discharge less than 53 ℃.Cycle life improves 43%, effectively improves the service behaviour of battery pack high-multiplying power discharge.
The assembly technology of out connector formation is simple in an embodiment, and all parts are realized standardization manufacturings.Same out connector mechanism can realize the output of multichannel function according to multilayer lug sheet metal number, the thermal power reduction of adopting both positive and negative polarity multilayer lug out connector structure can effectively improve assembling and conductive current.The present invention improves the fail safe and the reliability of battery pack; The bad hidden danger that the heat transferred electricity core that elimination produces because of welding brings; Significantly improve the polarity effect and the accumulation of thermal effect at the condition of work battery of the high output of battery specific power heavy-current discharge, battery operated temperature traditional polymer lithium ion battery structure on year-on-year basis will descend 30%, output capacity raising 38%; The battery polarization effect reduces, and the thermal runaway platform improves temperature 80-95 degree.
The foregoing description only is used to the inventive concept of the present invention of explaining, but not to the qualification of rights protection of the present invention, allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should fall into protection scope of the present invention.
Claims (10)
1. one kind big capacity height is exported specific power poly-lithium battery structure; It is characterized in that: comprise some monolithic battery pole pieces; All monolithic battery pole pieces are divided into some monolithics group; The lug pressing shaping of the same polarity of monolithic battery pole piece in the same monolithic group by positive and negative electrode anchor clamps welding clamping, has stacked anodal auxiliary electrode aluminium conductive metal sheet and polytetrafluoroethylene dividing plate thin slice between the adjacent set; Each organizes the anchor clamps of same polarity by unified corresponding connection of out connector, and final plastic-aluminum packaging film encapsulation forms.
2. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure, it is characterized in that: described anodal auxiliary electrode aluminium conductive metal sheet and anodal anchor clamps are overall structure.
3. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure is characterized in that: after the described plastic-aluminum packaging film encapsulation, around this structure cell, have the insulating radiation typing colloid layer of the moulding of being heating and curing.
4. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure; It is characterized in that: described out connector comprises insulation board and conductive metal sheet; Draw conductive metal sheet on each anchor clamps, the conductive metal sheet of same polarity is fixed on the same insulation board.
5. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure; It is characterized in that: after described insulation board adopts PPC macromolecule resin material sheet and conductive metal sheet to be separated by; Insert fixing tool, the synthetic processing mode of hot pressing forms the out connector overall structure.
6. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure; It is characterized in that: described insulation board adopts PPC macromolecule resin material and conductive metal sheet typing to be fixed on the injection mo(u)lding of mould mesohigh, forms the connector overall structure.
7. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure; It is characterized in that: described conductive metal sheet; Its anodal raffinal sheet metal that adopts, negative pole adopts high-purity copper or nickel sheet metal, and its THICKNESS CONTROL is the 0.01-0.5 millimeter.
8. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure, it is characterized in that: described insulation board THICKNESS CONTROL is the 0.01-0.6 millimeter.
9. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure, it is characterized in that: described polytetrafluoroethylene dividing plate sheet thickness is the 0.1-0.4 millimeter.
10. the high output of a kind of big capacity as claimed in claim 1 specific power poly-lithium battery structure, it is characterized in that: it is the silver coating of 0.005-0.015 millimeter that described conductive metal sheet, its surface all have thickness.
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| CN201210287923.0A CN102842700B (en) | 2012-08-14 | 2012-08-14 | A kind of Large Copacity height exports specific power poly-lithium battery structure |
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| CN201210287923.0A CN102842700B (en) | 2012-08-14 | 2012-08-14 | A kind of Large Copacity height exports specific power poly-lithium battery structure |
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| CN103825053A (en) * | 2014-03-17 | 2014-05-28 | 山东润峰集团新能源科技有限公司 | Manufacturing process of high-performance flexible package lithium ion battery cell |
| CN108336282A (en) * | 2017-01-20 | 2018-07-27 | 孚能科技（赣州）有限公司 | Battery connecting apparatus and battery modules |
| CN109273657A (en) * | 2018-08-21 | 2019-01-25 | 厦门纬达科技有限公司 | A kind of silver-plated tab of positive aluminium and its manufacture craft of flexible package lithium cell |
| TWI672851B (en) * | 2016-08-04 | 2019-09-21 | 光陽工業股份有限公司 | Battery module |
| CN111710819A (en) * | 2019-03-18 | 2020-09-25 | 宁德新能源科技有限公司 | Pole piece, battery core and battery |
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| CN102842700B (en) | 2015-12-16 |
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