CN106784587A - A kind of lithium battery group - Google Patents
A kind of lithium battery group Download PDFInfo
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- CN106784587A CN106784587A CN201710006902.XA CN201710006902A CN106784587A CN 106784587 A CN106784587 A CN 106784587A CN 201710006902 A CN201710006902 A CN 201710006902A CN 106784587 A CN106784587 A CN 106784587A
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- Prior art keywords
- lithium battery
- stop
- tracks
- control board
- lithium
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 87
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 210000004027 cell Anatomy 0.000 claims abstract description 24
- 239000005955 Ferric phosphate Substances 0.000 claims abstract description 20
- 229940032958 ferric phosphate Drugs 0.000 claims abstract description 20
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims abstract description 20
- 229910000399 iron(III) phosphate Inorganic materials 0.000 claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 210000005056 cell body Anatomy 0.000 claims abstract description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 18
- 230000005693 optoelectronics Effects 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 239000006258 conductive agent Substances 0.000 description 11
- 239000002041 carbon nanotube Substances 0.000 description 10
- 229910021393 carbon nanotube Inorganic materials 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 230000004888 barrier function Effects 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 9
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052493 LiFePO4 Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZSYNKHJUSDFTCQ-UHFFFAOYSA-N [Li].[Fe].P(O)(O)(O)=O Chemical compound [Li].[Fe].P(O)(O)(O)=O ZSYNKHJUSDFTCQ-UHFFFAOYSA-N 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004804 winding 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
- 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
- H01M50/572—Means for preventing undesired use or discharge
-
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a kind of lithium battery group, including including three section lithium batteries and lead assemblies, the three sections lithium battery includes the first lithium battery, second lithium battery and the 3rd lithium battery, first lithium battery, second lithium battery and the 3rd lithium battery are placed side by side in the opposite direction, the both positive and negative polarity of adjacent lithium battery is connected by nickel strap, wiring board is provided between first lithium battery and the second lithium battery, nickel strap of the two ends of the wiring board respectively with lithium battery group two ends is connected, the wiring board is connected with lead assemblies, it is characterised in that：The ferric phosphate lithium cell, including ferric phosphate lithium cell body, the ferric phosphate lithium cell body upper part are provided with anode pole piece and cathode pole piece, and low contact resistance device is provided with the anode pole piece.The present invention by lithium battery group set wiring board draw positive and negative lead wires again, excessively stream, cross put, overcharge or short circuit in the case of, wiring board can both protect battery with automatic shutdown circuit, and peril can be avoided again.
Description
Technical field
The present invention relates to cell art, more particularly to a kind of lithium battery group
Background technology
At present, lithium ion battery is widely used to number, electric tool, communication energy storage, solar energy storage and electronic
Numerous new energy fields such as automobile.Power-type lithium ion can be used in portable set, satellite, redundant electrical power, electric automobile
Etc. various fields, with the potentiality for substituting secondary energy sources, have broad prospects.
The domestic widely used cathode film of power-type lithium ion battery, negative electrode film, barrier film, electrolyte and shell, by winding
Or lamination process is made.It has have extended cycle life, output voltage is high, have a safety feature, memory-less effect, and from
Electric discharge is small to wait many merits, the need for substantially meeting existing market, has also obtained quick development.But as new energy is produced
The further development of industry, the especially fast development of electric automobile industry, requirement higher is proposed to lithium ion battery, such as
Ask that weight is lighter, specific energy is higher, security is more preferable, service life is longer, big multiplying power discharging property is more preferable, heat dispersion is more preferable
And the characteristic such as easy to assembly, particularly the energy density and security performance of high capacity lithium ion battery are proposed it is higher will
Ask.
Current many world-renowned automobile vendors are devoted to develop pure electric automobile and hybrid vehicle, and most of
What is used is all lithium-ion-power cell.In view of electric automobile security and service life the problems such as, current driving force battery
Mainly based on lithium iron phosphate dynamic battery, especially in many occupant's electric vehicles such as business type automobile and bus.Due to being
As the power resources of automobile, lithium iron phosphate dynamic battery at present using being or there is a problem of certain, mainly energy
The problems such as density deficiency causes short course continuation mileage, poor performance at low temperatures, memory type difference.
Currently, domestic and international lithium iron phosphate dynamic battery uses cathode film, negative electrode film, barrier film, electrolyte and shell, by volume
Around or lamination process made.Wherein positive pole is by LiFePO4, conductive agent (super-p and ks-6), adhesive, collector
Aluminium foil is constituted；Negative pole is made up of graphite, conductive agent (super-p), adhesive (SBR), thickener (cmc), copper foil of affluxion body；Every
Film is made by polypropylene or polythene material；Electrolyte is made up of organic solvent and lithium salts；Shell using metal shell or
Aluminum-plastic composite membrane.
Because LiFePO 4 material self-conductance rate is relatively low, poorly conductive will add substantial amounts of conductive agent (5%- when using
6%) it is, not high this results in battery energy density.Meanwhile, material self-conductance rate is relatively low, also causes LiFePO 4 material sheet
Body high rate performance is poor, and caloric value is higher when being used as electrokinetic cell, and long-term use has potential safety hazard.
On the other hand, LiFePO 4 material low temperature performance is poor, and -20 DEG C of electric discharges can only release the 40- of normal temperature capacity
50%, when temperature is used compared with low environment in the winter time, capacity is substantially reduced, and have impact on the course continuation mileages such as automobile.
The content of the invention
To overcome LiFePO 4 material low temperature performance present in prior art poor, -20 DEG C of electric discharges can only be released often
The 40-50% of warm capacity, when temperature is used compared with low environment in the winter time, the problem that capacity is substantially reduced, the invention provides one kind
Lithium battery group.
The technical solution adopted by the present invention is：A kind of lithium battery group, including include three section lithium batteries and lead assemblies, described three
Section lithium battery includes the first lithium battery, the second lithium battery and the 3rd lithium battery, first lithium battery, the second lithium battery and the 3rd
Lithium battery is placed side by side in the opposite direction, and the both positive and negative polarity of adjacent lithium battery is connected by nickel strap, first lithium battery and second
Wiring board is provided between lithium battery, the nickel strap of the two ends of the wiring board respectively with lithium battery group two ends is connected, the wiring board with draw
Line component is connected, it is characterised in that：The ferric phosphate lithium cell, including ferric phosphate lithium cell body, the ferric phosphate lithium cell sheet
Body top is provided with anode pole piece and cathode pole piece, and low contact resistance device is provided with the anode pole piece.
In some embodiments, low contact resistance device includes metal fixing plate, silver metal plate, conductive plate and fitness machine
Structure；The both sides of the metal fixing plate are separately installed with silver metal plate, and the opposite side of two silver metal plates is respectively mounted conduction
Plate, motion is connected on the conductive plate；The motion control conductive plate and the contact area of anode pole piece, realize electricity
Flow the adjustability of size.
In some embodiments, the motion includes tracks, motion control board and optoelectronic switch, the fortune
Dynamic rail road is fixed on silver metal plate, the length Hs of the length h less than silver metal plate of the tracks, more than the length of electrode slice
s；The motion control board and moving race orthogonal, and motion control board slip is fixed on tracks top, motion control board
Side is fixedly connected conductive plate；The optoelectronic switch is arranged on the end of tracks, realizes the proper motion of motion control board.
In some embodiments, the moving race orthogonal is fixed on silver metal plate.
In some embodiments, the motion control board is slided by carriage and is fixed on tracks top；Institute
Carriage is stated including slip ring and start stop apparatus is slided；The slip start stop apparatus is arranged on slip ring lower section, with slip ring activity even
Connect；The slip ring is a round-meshed projection, and the projection is arranged on any side two ends and the motion rail of motion control board
The region of road contact slide；The projection is integrally formed with motion control board.
In some embodiments, the slip start stop apparatus includes sliding seat, card spiral arm and rotary shaft；The sliding seat
Center position is provided with the rotary shaft of a rotation, and rotary shaft top is provided with the card spiral arm for driving rotary shaft rotation, card rotation
Arm is by its rotation of driving mechanisms control or stops.
In some embodiments, current collector aluminum foil, positive pole ear and insulating barrier, the collection are included on the anode pole piece
Fluid aluminium foil one end is fixedly installed positive pole ear, and the insulating barrier is covered in position of the lug near pole piece edge；The insulation
Layer is the structure of laterally disposed Ω, cladding lug in the intermediate groove of the structure of the laterally disposed Ω, and laterally disposed
Ω structure both sides near pole piece edge.
It is a further object to provide the anode sizing agent used in a kind of ferric phosphate lithium cell, its innovative point exists
In：Including LiFePO4, carbon nanotube powder or carbon nano tube paste, adhesive and 1-METHYLPYRROLIDONE solvent；It is described
Between 16-30nm, pipe range is 5-9 or 16-20 μm to the caliber of CNT；The carbon nano tube paste solid content is in 5-10%
Between.
In some embodiments, the addition of the CNT is in 0.5-1.5%；The addition of described adhesive is
2.5-3.5%.
In some embodiments, described adhesive includes the increasing of the blend polymer and 32-35wt% of 65-68wt%
Stick；The blend polymer includes (methyl) acrylate copolymer, vinyl-vinyl acetate copolymer and conjugated diene
The polymer of compound；The density range of the vinyl-vinyl acetate copolymer is 0.350~0.691g/cm3.
In some embodiments, in the blend polymer (methyl) acrylate copolymer addition be 26~
32wt%, vinyl-vinyl acetate copolymer addition is 50~61wt%, the addition of the polymer of conjugated diene compound
It is 13~18wt%.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, ferric phosphate lithium cell of the invention is bright improves production efficiency, improves the production capacity of dispensing mixing plant, while
It is cost-effective, reduce environmental pollution.Positive pole has saved the dispensing time using CNT as conductive agent, while solid content
The cost of organic solvent had both been saved in lifting (lifting 10-15%), and the pollution of NMP discharges is reduced again.
2nd, The present invention reduces the addition (addition is 0.5-1.5%) of conductive agent, the addition of adhesive is decreased
Amount (addition is 3% or so), thus substantially increases ratio (the active material ratio phase of anode active material of phosphate iron lithium
Than conventional conductive agent by 90% or so lifting to 96% or so), so as to improve the energy density (lifting of iron lithium dynamical battery
5% or so), in 155-160wh/kg, traditional ferric phosphate lithium cell is in 110-120wh/kg for carbon nano-tube power cell energy density.
3rd, battery of the present invention improves the high rate performance (2C electric discharges more than 99%) and low temperature discharge property of ferric phosphate lithium cell
Energy (- 20 DEG C of electric discharges more than 70%), while also reducing the internal resistance of cell, (the 50Ah internal resistances of cell are reduced to 0.5- by 0.8-0.9m Ω
0.6m Ω), the improvement of high rate performance reduces the caloric value of battery discharge, also improves the security performance (accompanying drawing 1,2) of battery.
The battery also improves the performance (gram volume is lifted to 143mAh/g by 140mAh/g) of positive pole LiFePO 4 material gram volume, enters
One step improves the energy density of battery.
4th, present invention improves self-discharge of battery performance, the normal temperature and low temperature discharge property of lithium iron phosphate dynamic battery are improve
Energy.Normal temperature charged storage in 28 days：Capability retention is 98.6% within 28 days, and self-discharge rate is 1.4%, and capacity restoration rate is
99.0%, attenuation rate is 1%；High temperature 60 DEG C charged storage in 7 days：Capability retention is 97.9%, and self-discharge rate is 2.1%, is held
Amount recovery rate is 98.5%, and attenuation rate is 1.5%.
5th, the present invention greatly improves LiFePO4 power using the CNT of specific caliber and pipe range as conductive agent
The cycle life of battery, 2000 weeks more than 86% normal temperature circulation life-span, it is contemplated that at 3000 weeks or so, 60 DEG C of cycle lives of high temperature existed
It is particularly well-suited within more than 1300 weeks make LiFePO4 motive-power battery, has been widely used for pure electric automobile, hybrid power
Numerous new energy fields such as automobile.
Brief description of the drawings
Fig. 1 is ferric phosphate lithium cell overall structure diagram of the present invention；
Fig. 2 is Fig. 1 ferric phosphate lithium cell overall structure side views；
Fig. 3 low contact resistance apparatus structure schematic diagrams of the present invention；
Fig. 4 is that slip ring is arranged on low contact resistance setting position schematic diagram；
Fig. 5 is slip ring structure schematic diagram；
Fig. 6 is the slip start stop apparatus structural representation in one embodiment of the present invention；
Fig. 7 is enlarged drawing at the B of Fig. 6；
Fig. 8 is the slip start stop apparatus structural representation in another embodiment of the present invention；
Fig. 9 is enlarged drawing at the C of Fig. 8；
Figure 10 is anode pole piece structural representation of the present invention；
Figure 11 is structural representation at the A of Figure 10；
Figure 12 is battery rate discharge curves；
Figure 13 is battery low temperature discharge curve (different temperatures electric discharge correlation curve)；
Figure 14 is the graph of a relation of discharge capacity and cycle-index in battery 1C normal temperature circulation curves；
Figure 15 is the graph of a relation of capability retention and cycle-index in battery 1C normal temperature circulation curves；
Figure 16 is the graph of a relation of discharge capacity and cycle-index in 60 DEG C of high temperature circulation curves of battery 1C；
Figure 17 is the graph of a relation of capability retention and cycle-index in 60 DEG C of high temperature circulation curves of battery 1C.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment is only used to explain the present invention, is not intended to limit the present invention.
The present invention discloses a kind of lithium battery group, including three section lithium batteries and lead assemblies are included, the three sections lithium battery pack
The first lithium battery, the second lithium battery and the 3rd lithium battery are included, first lithium battery, the second lithium battery and the 3rd lithium battery press phase
Opposite direction is placed side by side, and the both positive and negative polarity of adjacent lithium battery is connected by nickel strap, between first lithium battery and the second lithium battery
Wiring board is provided with, the nickel strap of the two ends of the wiring board respectively with lithium battery group two ends is connected, and the wiring board is connected with lead assemblies,
It is characterized in that：The ferric phosphate lithium cell, the battery improves existing lithium iron phosphate dynamic battery forthright difference, low temperature properties again
The drawbacks of energy is poor, energy density is low, while also substantially increasing the security performance of lithium ion battery, production efficiency, cycle life
Etc. performance.As shown in Figure 1：Including ferric phosphate lithium cell body, the ferric phosphate lithium cell body upper part is provided with anode pole piece 2-1
With cathode pole piece 2-2, low contact resistance device is installed on the anode pole piece 2-1, as shown in Figure 1：Low contact resistance device
Including metal fixing plate 1, silver metal plate 10, conductive plate 11 and motion；The both sides of the metal fixing plate 1 are separately installed with
Silver metal plate 10, the opposite side of two silver metal plates 10 is respectively mounted conductive plate 11, and fitness machine is connected on the conductive plate 11
Structure；The motion control conductive plate 11 and the contact area of anode pole piece 2-1, realize the adjustability of size of current.This hair
Bright motion drives conductive plate 11 to move back and forth in the z-axis direction (as shown in Figure 2), adjusts conductive plate 11 and positive pole
The contact area of pole piece 2-1, can effectively reduce contact resistance, it is to avoid high temperature is produced when electrode is by high current and is damaged
Simultaneously, moreover it is possible to improve the performance of anode pole piece gram volume, improvement reduces the caloric value of battery discharge, also improves battery
Security performance.
As it is further preferred that in this implementation method of the invention, as shown in Figure 3：Motion includes motion rail
Road 30, motion control board 31 and optoelectronic switch 32, the tracks 30 are fixed on silver metal plate 10, the tracks 30
Length h is less than the length H of silver metal plate 10, more than the length s (as shown in Fig. 2 side views) of electrode slice；The motion control board
31 is vertical with tracks 30, and motion control board 31 is slided and is fixed on the top of tracks 30, and the side of motion control board 31 is consolidated
Surely conductive plate 11 is connected；The optoelectronic switch 32 is arranged on the end of tracks 30, as shown in figure 3, optoelectronic switch 32 is installed
In the end termination away from conductive plate 11, when end is reached, optoelectronic switch 32 is closed, the stop motion of motion control board 31, is kept away
Exempt from motion control board 31 interruption of service such as to drop, realize the proper motion of motion control board 31.Certainly, motion control board 31 is another
End connection conductive plate 11, specifically, being that motion control board 31 connects conductive plate 11, motion control away from a side of optoelectronic switch 32
The reciprocating motion of making sheet 31 drives conductive plate 11 to be also carried out moving back and forth in track, and simple structure is easy to implement, most important
It is that can expand adjustable range；Tracks 30 are parallel to be fixed on silver metal plate 10, i.e., tracks 30 are parallel to silver metal
, perpendicular to tracks 30, perpendicular to motion control board 31, three is in three dimensions model for conductive plate 11 for plate 10, motion control board 31
It is vertical two-by-two in farmland.As it is further preferred that the motion control board 31 is slided by carriage is fixed on tracks
30 tops.Used as it is further preferred that tracks 30 are cylinder, and surface is smooth, is easy to the motion of motion control board 31.
As shown in figure 3, the carriage includes slip ring 40, the slip ring 40 is half toroidal, and is fixed
In the bottom of motion control board 31, the semicircular ring passes through tracks 30, it is ensured that motion control board 31 is smoothly in tracks
Moved reciprocatingly on 30.
In another embodiment of the present invention, the carriage includes slip ring 50 and slides start stop apparatus；The cunning
Dynamic start stop apparatus is arranged on the lower section of slip ring 50, is flexibly connected with slip ring；As shown in Figure 4：The slip ring 50 is one with circular hole 54
Projection, the projection is arranged on any side two ends of motion control board 31 and the region of the contact slide of tracks 30；Institute
Projection is stated to be integrally formed with motion control board 31.As shown in Figure 5：Projection of the invention include projection seat 51, connecting shaft 52 and in
Between be provided with the projection block 53 of circular hole 54；The size of the circular hole 54 can just meet the width of tracks 30；The projection
Seat 51 is fixed in tracks 30, and projection seat 51 is connected by connecting shaft 52 with projection block 53.The connecting shaft 52 can be with excellent
Elect L-type shape at an acute angle as.The setting of connecting shaft 52, can effective rushing of bringing of the motion in the circular hole 54 of kicking motion control panel 31
Power is hit, delays the damage speed of projection seat 51.L-type shape at an acute angle, can also be by changing the size of specific angle, and regulation is prominent
The distance of seat 51 and projection block 53 is played, the motion of different size of motion control board 31 is met.As it is further preferred that conduct
Coordinate the regulation of slip ring 50, the motion control plate surface also sets up a slim interior lining panel 54, and the interior lining panel 54 is controlled with motion
Making sheet 31 is closely connected, and the surface of the interior lining panel 54 is provided with some fixed strips 56, and the slip ring 50 is fixed on interior lining panel 54
In fixed strip, on the one hand preferably slip ring 50 can be fixed, on the other hand can adjust between two slip rings 50 away from
From so as to adjust effective sliding area of motion control board 31, meeting the size requirement of Different electrodes pole piece.
It is further preferred that the start and stop in order to preferably control motion control board 31, realize that Automated condtrol starts and stops
Only, in this implementation method of the invention, start stop apparatus is slided by connecting a controller, realize automatic and stopping.
As shown in Figure 6,7：The slip start stop apparatus includes start and stop seat 60 and start and stop first 61, and the motion of the start and stop seat 60 is by control
Device is controlled；The start and stop first 61 are connected with start and stop seat 60, and are integrally formed.60 installation activities of the start and stop seat are arranged on projection seat
On 51, the slip start stop apparatus is in integrally barb type structure.Preferably, both start and stop seat 60 and projection seat 51 pass through adapter phase
Even, the such design of the present invention, can control start and stop seat 60 to move by controller, adjust its distance with tracks 30,
To realize the start and stop of motion control board 31.As shown in Figure 7：First 61 surface of start and stop is in yi word pattern structure, and yi word pattern structure is
Mal-distribution, start and stop seat 60 is arranged on the position of yi word pattern 1/3,2/3 is partially toward at tracks 30 in addition, for opening
Stop motion control board 31.Asymmetric setting, can effectively expand start-up and shut-down control area, increase start-up and shut-down control dynamics, it is ensured that device
Trouble-free operation.
Because the start and stop distance of the structure control motion control board of above-mentioned slip start stop apparatus is shorter, as further excellent
Choosing, as shown in Figure 8,9：In this implementation method of the invention, further carried out preferably to sliding start stop apparatus, shown cunning
Dynamic start stop apparatus is controlled by rotary motion all around.The slip start stop apparatus may be mounted at motion control board 31
The one or both sides of the both ends of the surface contacted with tracks 30 are installed simultaneously, and start and stop are better.As shown in Figure 8：Slide start and stop
Device is arranged in the both ends of the surface that motion control board 31 is contacted with tracks 30, and end face is arranged on side, other end two
Install simultaneously side.As shown in Figure 9：Specifically, sliding start stop apparatus includes sliding seat 71, card spiral arm 73 and rotary shaft 72；It is described
The center position of sliding seat 71 is provided with the rotary shaft 72 of a rotation, and the top of rotary shaft 72 is provided with drive rotary shaft 72 and rotates
Card spiral arm 73, card spiral arm 73 by drive mechanism (not shown) control its rotate or stop.For example, in present embodiment
In, sliding start stop apparatus and be arranged in the both ends of the surface that motion control board 31 is contacted with tracks 30, end face is arranged on left side,
Install simultaneously the other end left and right sides.When needing to start, the slip start stop apparatus of both ends of the surface is driven by drive mechanism, card
Spiral arm 73 is pivoted away from tracks 30, until do not influence motion control board 31 to move, when needing to stop, the slip of both ends of the surface
Start stop apparatus is driven by drive mechanism, and the rotation of card spiral arm 73 carries out card rotation resistance to being in contact with tracks 30 and stops.Certainly, it is left
Right both sides are installed when sliding start stop apparatus simultaneously, and resistance stops better.
As another inventive point of the invention, as shown in Figure 10：In this implementation method of the invention, the positive pole pole
Include current collector aluminum foil 81, positive pole ear 82 and insulating barrier 83 on piece, the one end of the current collector aluminum foil 81 is fixedly installed positive pole pole
Ear 82, the insulating barrier 83 is covered in position of the lug near pole piece edge；As shown in figure 11：The insulating barrier 83 is put for horizontal
The knot of the structure of the Ω for putting, cladding lug in the intermediate groove 831 of the structure of the laterally disposed Ω, and laterally disposed Ω
Structure both sides are near pole piece edge.Insulating barrier of the invention 83 is arranged on the intersection of lug and pole piece, the insulation meter of insulating barrier 83
Area is big, can effectively improve insulation degree.
Another innovative point of the invention is to provide the anode sizing agent used in a kind of ferric phosphate lithium cell, specifically, bag
Include LiFePO4, carbon nanotube powder or carbon nano tube paste, adhesive and 1-METHYLPYRROLIDONE solvent；The carbon nanometer
Between 16-30nm, pipe range is 5-9 or 16-20 μm to the caliber of pipe；The carbon nano tube paste solid content is between 5-10%.
The addition of CNT is in 0.5-1.5%；The addition of described adhesive is 2.5-3.5%.LiFePO4 power type electricity
Pond using caliber between 16-30nm, pipe range be 5-9 or 16-20 μm of CNT as conductive agent, led when having saved dispensing
The electric agent scattered time, improve production efficiency.The wherein addition of CNT in 0.5-1.5%, far below conventional conductive
The addition (5-6%) of agent.Other kinds of caliber or pipe range can not reach this effect.
As it is further preferred that described adhesive includes the increasing of the blend polymer and 32-35wt% of 65-68wt%
Stick；The blend polymer includes (methyl) acrylate copolymer, vinyl-vinyl acetate copolymer and conjugated diene
The polymer of compound；The density range of the vinyl-vinyl acetate copolymer is 0.350~0.691g/cm3.More enter one
Step, (methyl) acrylate copolymer addition is 26~32wt%, ethylene-vinyl acetate c in blend polymer
Thing addition is 50~61wt%, and the addition of the polymer of conjugated diene compound is 13~18wt%.In the present invention, carbon
During nanotube battery dispensing, organic solvent (NMP) can be greatlyd save, slurry solid content can be lifted to 65% or so, than passing
System conductive agent slurry, improves 10-15%；Binder compound of the invention is used simultaneously, can substantially reduce adhesive
Addition (is reduced to 3% or so) by 5% or so.Additionally, on the one hand the lifting of slurry solid content can save organic solvent, subtract
Of low pollution, on the other hand can improve the feeding quantity of dispensing mixing plant, improve equipment capacity；The drop of adhesive addition
It is low, cost has both been saved, pole piece internal resistance can be improved again, improve battery high rate performance.
In the process for preparation of the above-mentioned slurry of pole piece of positive pole of the present invention, (addition is 0.5- to reduce the addition of conductive agent
1.5%) addition (addition is 3% or so) of adhesive, is decreased, positive active material phosphorus is thus substantially increased
The ratio (active material ratio is compared to conventional conductive agent by 90% or so lifting to 96% or so) of sour iron lithium, so as to improve iron
The energy density (lifting 5% or so) of lithium dynamical battery, carbon nano-tube power cell energy density in 155-160wh/kg, traditional phosphoric acid
Lithium iron battery is in 110-120wh/kg.
The battery being made up of above-mentioned anode pole piece, improves the high rate performance (2C electric discharges more than 99%) of ferric phosphate lithium cell
With low temperature performance (- 20 DEG C of electric discharges more than 70%), while also reducing the internal resistance of cell, (the 50Ah internal resistances of cell are by 0.8-0.9m
Ω is reduced to 0.5-0.6m Ω), the improvement of high rate performance reduces the caloric value of battery discharge, also improves the security of battery
Energy.The battery also improves the performance of positive pole LiFePO 4 material gram volume, and (gram volume is lifted to 143mAh/ by 140mAh/g
G), further improve the energy density of battery.
50Ah carbon nano-tube power cell multiplying power discharging data such as following tables：
The battery improves self-discharge of battery performance, improves the normal temperature and low temperature discharge property of lithium iron phosphate dynamic battery
Energy.Normal temperature charged storage in 28 days：Capability retention is 98.6% within 28 days, and self-discharge rate is 1.4%, and capacity restoration rate is
99.0%, attenuation rate is 1%；High temperature 60 DEG C charged storage in 7 days：Capability retention is 97.9%, and self-discharge rate is 2.1%, is held
Amount recovery rate is 98.5%, and attenuation rate is 1.5%.
Carbon nano-tube power cell also greatly improves the cycle life of lithium iron phosphate dynamic battery, normal temperature circulation life-span simultaneously
2000 weeks more than 86%, it is contemplated that at 3000 weeks or so, 60 DEG C of cycle lives of high temperature were more than 1300 weeks.It is therefore particularly suitable for system
Make LiFePO4 motive-power battery, have been widely used for numerous new energy fields such as pure electric automobile, hybrid vehicle.
Described above has shown and described the preferred embodiments of the present invention, as previously described, it should be understood that not office of the invention
Be limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and can be used for various other combinations, modification and
Environment, and can be changed by the technology or knowledge of above-mentioned teaching or association area in invention contemplated scope described herein
It is dynamic.And the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention, then all should be appended by the present invention
In scope of the claims.
Claims (10)
1. a kind of lithium battery group, including three section lithium batteries and lead assemblies are included, the three sections lithium battery includes the first lithium battery, the
Two lithium batteries and the 3rd lithium battery, first lithium battery, the second lithium battery and the 3rd lithium battery are placed side by side in the opposite direction,
The both positive and negative polarity of adjacent lithium battery is connected by nickel strap, is provided with wiring board between first lithium battery and the second lithium battery, the line
Nickel strap of the two ends of road plate respectively with lithium battery group two ends is connected, and the wiring board is connected with lead assemblies, it is characterised in that：It is described
Ferric phosphate lithium cell, including ferric phosphate lithium cell body, the ferric phosphate lithium cell body upper part be provided with anode pole piece (2-1) and
Cathode pole piece (2-2), is provided with low contact resistance device on the anode pole piece.
2. lithium battery group according to claim 1, it is characterised in that：The low contact resistance device includes metal fixing plate
(1), silver metal plate (10), conductive plate (11) and motion；The both sides of the metal fixing plate (1) are separately installed with silver metal
Plate (10), the opposite side of two silver metal plates (10) is respectively mounted conductive plate (11), and motion is connected on the conductive plate (11)
Mechanism；The motion controls the contact area of conductive plate (11) and anode pole piece, realizes the adjustability of size of current.
3. lithium battery group according to claim 2, it is characterised in that：The motion includes tracks (30), fortune
Dynamic control panel (31) and optoelectronic switch (32), the tracks (30) are fixed on silver metal plate (10), the tracks
(30) length h is less than the length H of silver metal plate (10), more than the length s of electrode slice；The motion control board (31) and motion
Track (30) is vertical, and motion control board (31) is slided and is fixed on tracks (30) top, and motion control board (31) side is solid
Surely connection conductive plate (11)；The optoelectronic switch (32) realizes motion control board (31) installed in the end of tracks (30)
Proper motion.
4. lithium battery group according to claim 3, it is characterised in that：The motion control board (31) is slided by carriage
It is dynamic to be fixed on tracks (30) top；The carriage includes slip ring (50) and slip start stop apparatus, slides start stop apparatus
Slip ring (50) lower section is fixed on, is flexibly connected with slip ring (50)；The slip start stop apparatus includes start and stop seat (60) and start and stop head
(61), the motion of start and stop seat (60) is by controller control；Start and stop head (61) and start and stop seat (60) company of being integrally formed
Connect.
5. lithium battery group according to claim 4, it is characterised in that：The carriage includes slip ring (40), described
Slip ring (40) is half toroidal, and is fixed on motion control board (31) bottom, and the semicircular ring passes through tracks
(30), it is ensured that motion control board 31 smoothly moves reciprocatingly in tracks (30).
6. lithium battery group according to claim 4, it is characterised in that：The slip ring (50) is prominent with circular hole (54) for one
Rise, the projection is arranged on any side two ends of motion control board (31) and the region of tracks (30) contact slide；Institute
Projection is stated to be integrally formed with motion control board (31).
7. lithium battery group according to claim 6, it is characterised in that：The projection includes projection seat (51), connecting shaft
And middle setting has the projection block (53) of circular hole (54) (52)；The size of the circular hole (54) can just meet tracks (30)
Width；The projection seat (51) is fixed in tracks (30), and projection seat (51) is by connecting shaft (52) and projection block
(53) connect.
8. lithium battery group according to claim 4, it is characterised in that：Described start and stop seat (60) installation activity is arranged on projection
On seat (51)；Both start and stop seat (60) and projection seat (51) are connected by adapter, and start and stop (60) are moved, adjust its with
The distance of tracks (30), realizes the start and stop of motion control board (31).
9. lithium battery group according to claim 4, it is characterised in that：Described start and stop head (61) surface is in yi word pattern structure,
Yi word pattern structure is mal-distribution, and start and stop seat (60) 2/3 are partially toward motion installed in the position of yi word pattern 1/3 in addition
Track (30) place, for start and stop motion control board (31).
10. lithium battery group according to claim 4, it is characterised in that：It is described slip start stop apparatus include sliding seat (71),
Card spiral arm (73) and rotary shaft (72)；Sliding seat (71) center position is provided with the rotary shaft (72) of a rotation, rotation
Rotating shaft (72) top is provided with the card spiral arm (73) for driving rotary shaft (72) rotation, and card spiral arm (73) is by its rotation of driving mechanisms control
Turn or stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710006902.XA CN106784587A (en) | 2017-01-05 | 2017-01-05 | A kind of lithium battery group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710006902.XA CN106784587A (en) | 2017-01-05 | 2017-01-05 | A kind of lithium battery group |
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| CN106784587A true CN106784587A (en) | 2017-05-31 |
Family
ID=58949604
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710006902.XA Pending CN106784587A (en) | 2017-01-05 | 2017-01-05 | A kind of lithium battery group |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114194759A (en) * | 2021-11-16 | 2022-03-18 | 梦淘(广州)电子商务有限公司 | Lithium cell centre gripping transfer device and lithium cell production line |
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