CN109687011A - A kind of laminated lithium ion battery and preparation method thereof - Google Patents
A kind of laminated lithium ion battery and preparation method thereof Download PDFInfo
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- CN109687011A CN109687011A CN201811595421.8A CN201811595421A CN109687011A CN 109687011 A CN109687011 A CN 109687011A CN 201811595421 A CN201811595421 A CN 201811595421A CN 109687011 A CN109687011 A CN 109687011A
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- negative
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- core
- connecting strap
- core packet
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical class [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 210000005069 ears Anatomy 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 41
- 229910052799 carbon Inorganic materials 0.000 claims description 34
- 238000003466 welding Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 14
- 238000003475 lamination Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000007773 negative electrode material Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000011267 electrode slurry Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000002071 nanotube Substances 0.000 claims 1
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 7
- 238000004804 winding Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000005405 multipole Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 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
- H01M10/05—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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
-
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
Abstract
The present invention discloses a kind of laminated lithium ion battery and preparation method thereof, wherein, laminated lithium ion battery includes shell, top cover and the Positive Poles and negative pole being arranged on top cover, shell is in one end enclosuring structure open at one end, the open end of shell passes through top seal, battery core is provided in shell, battery core includes at least two core packets, each core packet is laminated structure, all positive pole ears of each core packet are welded as a whole by positive connecting strap, all negative lugs of each core packet are welded as a whole by negative connecting strap, Positive Poles connection on all positive connecting straps and top cover, negative pole connection on all negative connecting straps and top cover.Laminated lithium ion battery structure of the invention is simple, and capacity is big, has extended cycle life, and security performance is high, is suitble to high power discharge and is easily achieved large-scale production.
Description
Technical field
The present invention relates to battery technology fields more particularly to a kind of laminated lithium ion battery and preparation method thereof.
Background technique
With the development of power and energy-storage battery, it is desirable that battery has higher energy density and excellent high rate performance,
Widespread practice is to reduce block structure by production high capacity large scale battery to improve specific energy, for example, market in industry
On 71173205 rectangular cell of model, using it is unidirectional go out tab winding method make battery core, tab welding layer
About 60 layers of number, is the welding number of plies for capableing of steady production at present.
The battery core of unidirectional multipole ear winding is simple to connection type and welding process requirement, it is easy to accomplish.But due to volume
Around the complexity of structure, there is many places bending and thickness change region in entire pole piece, especially close to core in the longitudinal direction
The low-angle at middle part bends region sum aggregate flow soldering region, due to the uneven and change in shape of winding tension, it is easy to make
At the Folding Deformation of diaphragm and pole piece, positive and negative anodes cannot be contacted effectively, cause reaction dead zone, at the edge of fold when charging
" analysis lithium " phenomenon occurs for place, and the effective active material of battery is caused sufficiently to be reacted, cycle performance of battery decline, while also drawing
Very big security risk is played.And the tab overcurrent of the battery core of unidirectional multi pole ears winding-structure is less, it is difficult to meet fast charge technology.
Currently, common high capacity cell is there are also laminated batteries, laminated batteries have the advantage that relative to winding battery
1, laminated batteries have better cycle characteristics, security feature and energy density, without on length direction
Power influences, and contact of the pole piece with diaphragm is more excellent, interfacial reaction uniformity, and the capacity of active material has obtained abundant hair
It waves, performance has obtained basic improvement；
2, lamination has more uniform consistent current density, excellent internal heat dissipating performance and is more suitable for big function
Rate electric discharge.
But existing laminated batteries still have the disadvantage that the great Rong of similar 7113205 models at present on the market
Battery is measured, due to lamination, tab quantity is doubled than unidirectional tab winding method, and conventional welding is difficult to meet at present
Tab number is about 120 layers of steady production, and welding rear stability is poor, increases production difficulty.In addition, for long circulating lithium ion
Battery, the cementability of electrode are the principal elements for influencing cycle performance of battery, the especially cementability of negative electrode tab, at present frequently with
Method be to increase glue content in cathode formula to improve the cementability of electrode, but increase glue content and reduce to a certain extent
The electric conductivity of motor and the impedance for improving battery, are unfavorable for the cycle performance of battery.
Summary of the invention
One of the embodiment of the present invention is designed to provide a kind of laminated lithium ion battery, and structure is simple, and capacity is big, follows
The ring service life is long, and security performance is high, is suitble to high power discharge and is easily achieved large-scale production.
A kind of another production method for being designed to provide laminated lithium ion battery of the embodiment of the present invention, operation letter
It is single, it is easy to accomplish large-scale production.
For this purpose, the embodiment of the present invention uses following technical scheme:
In a first aspect, a kind of laminated lithium ion battery is provided, including shell, top cover and the anode being arranged on the top cover
Pole and negative pole, the shell are in one end enclosuring structure open at one end, and the open end of the shell is close by the top cover
It seals, battery core is provided in the shell, the battery core includes at least two core packets, and each core packet is laminated structure,
All positive pole ears of each core packet are welded as a whole by positive connecting strap, all negative lugs of each core packet
It being welded as a whole by negative connecting strap, all positive connecting straps are connect with the Positive Poles on the top cover,
All negative connecting straps are connect with the negative pole on the top cover.
As a kind of preferred embodiment of laminated lithium ion battery, the positive plate of the core packet includes plus plate current-collecting body and anode
Material, the position that the plus plate current-collecting body removes the positive pole ear are equipped with conductive carbon layer, and the positive electrode is coated in and is equipped with
On the plus plate current-collecting body of the conductive carbon layer；And/or
The negative electrode tab of the core packet includes negative current collector and negative electrode material, and the negative current collector removes the cathode pole
The position of ear is equipped with conductive carbon layer, and the negative electrode material is coated on the negative current collector equipped with the conductive carbon layer.
As a kind of preferred embodiment of laminated lithium ion battery, the conductive carbon layer is conductive black, carbon nanotube and leads
At least one of electro-graphitic.
As a kind of preferred embodiment of laminated lithium ion battery, the conductive carbon layer is coated in the plus plate current-collecting body or institute
It states on negative current collector.
As a kind of preferred embodiment of laminated lithium ion battery, the positive connecting strap is aluminium connecting band, and the cathode connects
Tape splicing is copper connecting band.
As a kind of preferred embodiment of laminated lithium ion battery, the positive pole ear and the positive connecting strap are equipped with height
Warm glue；And/or the negative lug and the negative connecting strap are equipped with the high-temp glue.
As a kind of preferred embodiment of laminated lithium ion battery, after all positive connecting straps are in parallel even by anode
Contact pin is connect with the Positive Poles on the top cover, after all negative connecting strap is in parallel by negative straps with
Negative pole connection on the top cover.
As a kind of preferred embodiment of laminated lithium ion battery, the battery core includes four core packets, each core
All positive pole ears of packet are welded on one end of the positive connecting strap, and all negative lugs of each core packet are welded on institute
State one end of negative connecting strap, four core packets are respectively the first core packet of sequence setting, the second core packet, third core packet and the
Four core packets；
Wherein, the positive connecting strap of both the first core packet and described second core packet is far from the positive pole ear
One end is connect with the first end of the positive strap, and the anode of both the third core packet and described 4th core packet is even
The one end of tape splicing far from the positive pole ear is connect with the second end of the positive strap；
The one end of the negative connecting strap far from the negative lug of both the first core packet and the second core packet
It is connect with the first end of the negative straps, the negative connecting strap of both the third core packet and described 4th core packet
One end far from the negative lug is connect with the second end of the negative straps；
The middle part of the positive strap and the Positive Poles are welded, the middle part of the negative straps and the cathode
Pole welding.
As a kind of preferred embodiment of laminated lithium ion battery, the battery core includes four core packets, four cores
Packet is emitted in the shell and vertical with the top cover side by side, and the battery core is coated with insulating protective film.
As a kind of preferred embodiment of laminated lithium ion battery, it is intracorporal that four core packets are respectively set in sequence in shell
First core packet, the second core packet, third core packet and the 4th core packet；
The positive connecting strap includes the first positive connecting strap and the second positive connecting strap, first positive connecting strap
All positive pole ears of first end and the first core packet weld, the second end of first positive connecting strap with it is described
All positive pole ear welding of 4th core packet, the institute of the first end of second positive connecting strap and the second core packet
The positive pole ear welding having, all anodes of the second end of second positive connecting strap and the third core packet
Tab welding, first positive connecting strap and the second positive connecting strap parallel connection and the Positive Poles are welded；
The negative connecting strap includes the first negative connecting strap and the second negative connecting strap, first negative connecting strap
All negative lugs of first end and the first core packet are welded, the second end of first negative connecting strap with it is described
All negative lug welding of 4th core packet, the institute of the first end of second negative connecting strap and the second core packet
The negative lug welding having, all cathode of the second end of second negative connecting strap and the third core packet
Tab welding, first negative connecting strap and the second negative connecting strap parallel connection and the negative pole are welded.
Second aspect provides a kind of production method of laminated lithium ion battery, manufactures the laminated lithium ion battery；
All positive pole ears of core packet after making lamination are welded as a whole by positive connecting strap, make all of the core packet
Negative lug is welded as a whole by negative connecting strap；
It connect all positive connecting straps with Positive Poles, connects all negative connecting straps and negative pole
It connects, forms battery core；
The battery core is set to carry out laminated lithium ion battery described in assembling procedure assembled formation.
As a kind of preferred embodiment of production method, toast the laminated lithium ion battery of assembled formation successively
Process, fluid injection process and negative pressure of vacuum formation process.
Conductive carbon is coated on plus plate current-collecting body before the core packet lamination as a kind of preferred embodiment of production method
Layer coats anode sizing agent in conductive carbon layer and forms positive plate, conductive carbon layer coated on negative current collector, in conductive carbon layer
It coats negative electrode slurry and forms negative electrode tab.
Beneficial effects of the present invention: by will connect again with pole after the connection of core Bao Yuxin packet, it can solve lamination multicore
The multi pole ears Welding Problems of packet battery, while the tab number of plies of single core packet is able to satisfy the requirement of current large-scale production, drop again
Low manufacture difficulty, is easy to implement large-scale production, meets the design requirement of the large-sized battery of high capacity, improve battery
Energy density；By setting lamination for core packet, this structural improvement contact interface of positive and negative anodes avoids because of winding
Diaphragm caused by power unevenness and change in shape and pole piece fold improve the cycle performance and security performance of battery, in addition, lamination knot
Structure increases the conveyance capacity of battery, improves the high rate performance of battery.
Detailed description of the invention
Fig. 1 is the decomposition diagram of the laminated lithium ion battery of the embodiment of the present invention.
Fig. 2 is the core packet connection schematic diagram of the laminated lithium ion battery of one embodiment of the invention.
Fig. 3 is the core packet connection schematic diagram of the laminated lithium ion battery of another embodiment of the present invention.
In figure:
1, shell；2, top cover；3, Positive Poles；4, negative pole；5, battery core；51, core packet；511, the first core packet；512,
Second core packet；513, third core packet；514, the 4th core packet；52, positive connecting strap；521, the first positive connecting strap；522, second
Positive connecting strap；53, negative connecting strap；54, positive strap；55, negative straps；56, insulating protective film.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing.
In the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", " fixation " are answered
It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection,
It can be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
Logical or two elements interaction relationship.For the ordinary skill in the art, can be understood with concrete condition above-mentioned
The concrete meaning of term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Shown in referring to Fig.1, the laminated lithium ion battery of the embodiment of the present invention includes shell 1, top cover 2 and is arranged on the top
Positive Poles 3 and negative pole 4 on lid 2, the shell 1 are in one end enclosuring structure open at one end, the open end of the shell 1
It is sealed by the top cover 2, battery core 5 is provided in the shell 1, the battery core 5 includes at least two core packets 51, each described
Core packet 51 is laminated structure, and all positive pole ears of each core packet 51 are welded as a whole by positive connecting strap 52,
All negative lugs of each core packet 51 are welded as a whole by negative connecting strap 53, all positive connecting straps 52
It is connect with the Positive Poles 3 on the top cover 2, it is described negative on all negative connecting straps 53 and the top cover 2
Pole pole 4 connects.By connecting again with pole after connecting core packet 51 with core packet 51,51 battery of lamination multicore packet can solve
Multi pole ears Welding Problems, while the tab number of plies of single core packet 51 is able to satisfy the requirement of current large-scale production again, reduces system
Difficulty is made, large-scale production is easy to implement, meets the design requirement of the large-sized battery of high capacity, the energy for improving battery is close
Degree；By setting lamination for core packet 51, this structural improvement contact interface of positive and negative anodes, avoid because winding tension not
Diaphragm and pole piece fold caused by equal and change in shape, improve the cycle performance and security performance of battery, in addition, lamination increases
The big conveyance capacity of battery, improves the high rate performance of battery.
In one embodiment, as depicted in figs. 1 and 2, battery core 5 includes four core packets 51, and four core packets 51 are emitted on shell side by side
In body 1, and it is vertical with top cover 2, one layer of insulating protective film 56 is wrapped in battery core 5.
Pass through the positive pole in positive strap 54 and the top cover 2 after all 52 parallel connections of the positive connecting strap
Column 3 connects, and passes through the cathode pole on negative straps 55 and the top cover 2 after all 53 parallel connections of the negative connecting strap
Column 4 connects.
Specifically, all positive pole ears of each core packet 51 are welded on one end of the positive connecting strap 52, each
All negative lugs of the core packet 51 are welded on one end of the negative connecting strap 53, and four core packets 51 are respectively sequence
The first core packet 511, the second core packet 512, third core packet 513 and the 4th core packet 514 being arranged.
Wherein, the positive connecting strap 52 of both the first core packet 511 and described second core packet 512 far from it is described just
One end of pole tab is connect with the first end of the positive strap 54, the third core packet 513 and the 4th core packet 514
The positive connecting strap 52 of the two is connect far from one end of the positive pole ear with the second end of the positive strap 54, institute
The one end of the negative connecting strap 53 far from the negative lug for stating both the first core packet 511 and the second core packet 512 is equal
It is connect with the first end of the negative straps 55, the cathode of 514 the two of the third core packet 513 and the 4th core packet
The one end of connecting band 53 far from the negative lug is connect with the second end of the negative straps 55, the positive strap 54
Middle part and the Positive Poles 3 weld, the middle part of the negative straps 55 and the negative pole 4 are welded, and stick height
Warm glue forms battery core 5.
As shown in figure 3, in other embodiments, the core packet 51 on both sides can also be connected and form one group, by the two of middle part
A connection of core packet 51 forms one group, connect again with pole after two groups of parallel connections.
Specifically, the positive connecting strap 52 includes the first positive connecting strap 521 and the second positive connecting strap 522, described
All positive pole ears of the first end of first positive connecting strap 521 and the first core packet 511 weld, and described first just
All positive pole ears of the second end of pole connecting band 521 and the 4th core packet 514 weld, the second anode connection
It is welded with 522 first end and all positive pole ears of the second core packet 512, second positive connecting strap 522
Second end and all positive pole ears of the third core packet 513 weld, first positive connecting strap 521 and described
It is welded after the connection of second positive connecting strap 522 with the Positive Poles 3.
The negative connecting strap 53 includes the first negative connecting strap and the second negative connecting strap, first negative connecting strap
First end and all negative lugs of the first core packet 511 weld, the second end of first negative connecting strap
It is welded with all negative lugs of the 4th core packet 514, the first end of second negative connecting strap and described the
All negative lug welding of two core packets 512, the second end of second negative connecting strap and the third core packet 513
All negative lugs welding, after first negative connecting strap and second negative connecting strap connection with it is described negative
Pole pole 4 welds.
Before welding, the first positive connecting strap 521, the second positive connecting strap 522, the first negative connecting strap and the second cathode
The both ends of this four connecting bands of connecting band bend 90 degree, so that core packet 51 (and battery core 5) and top cover 2 enter shell in 90 degree.
This structure eliminates the use of connection sheet, reduces connection difficulty, simplifies connection structure, can promote production effect
Rate, while pad is reduced, and then improve the quality after molding of battery core 5.
In one embodiment, the positive plate of the core packet 51 includes plus plate current-collecting body and positive electrode, the plus plate current-collecting body
Surface remove the positive pole ear position be equipped with conductive carbon layer, the positive electrode be coated in equipped with conductive carbon layer anode
On collector.Optionally, the negative electrode tab of the core packet 51 includes negative current collector and negative electrode material, the table of the negative current collector
The position that face removes the negative lug is equipped with conductive carbon layer, and the negative electrode material is coated in the cathode equipped with the conductive carbon layer
On collector.Wherein, positive electrode is the material being formed in conductive carbon layer after anode sizing agent is operated by coating, baking etc.
Layer, negative electrode material are the material layers being formed in conductive carbon layer after negative electrode slurry is operated by coating, baking etc..
By presetting one layer of conductive carbon layer outside positive and negative electrode collector, can be improved positive and negative plate cementability and
Electric conductivity, and due to the open structure of conductive carbon layer, to electrode material (i.e. positive electrode and negative electrode material) in cyclic process
Expansion brings cushion space, and the expansion picking of electrode material has been effectively relieved, has been conducive to cycle performance.
Optionally, the conductive carbon layer is at least one of conductive black, carbon nanotube and electrically conductive graphite.
Optionally, the conductive carbon layer is coated on the plus plate current-collecting body or the negative current collector.
In one embodiment, the positive pole ear and the positive connecting strap 52 are equipped with high-temp glue；The negative lug and
The negative connecting strap 53 is equipped with the high-temp glue.By the way that high-temp glue is arranged, it can insulate, prevent to tab and connecting band
It is only short-circuit, while high-temp glue avoids battery charge and discharge process from causing adhesive tape to fall off or melt because of the rising of tab temperature.
The embodiment of the present invention also provides a kind of production method of laminated lithium ion battery, comprising the following steps:
Step S10, ingredient:
The anode sizing agent with NMP (methyl pyrrolidone) for solvent is prepared, material requested has: bonding agent 2%~5%, just
Bonding agent, positive electrode and conductive agent are uniformly dispersed by pole material 90%~97%, conductive agent 1%~5% in a solvent, shape
At this anode sizing agent；
The negative electrode slurry taken water as a solvent is prepared, material requested has: graphite 90%~97%, sodium carboxymethylcellulose 1%
~3%, conductive agent 1%~3%, butadiene-styrene rubber 1%~4%, by sodium carboxymethylcellulose, graphite, conductive agent and butadiene-styrene rubber
It is uniformly dispersed in a solvent, forms negative electrode slurry；
Step S20, it is coated with:
Tab region coating conductive carbon layer will be removed on plus plate current-collecting body and negative current collector, by the anode sizing agent after sieving
It is uniformly coated on the plus plate current-collecting body and negative current collector equipped with conductive carbon layer with negative electrode slurry, and reserves uncoated area
It toasts to form positive and negative plate subsequently into coating machine oven as tab region in domain；
Step S30, roll-in:
Positive and negative plate after coating baking is subjected to roll-in, the compacted density of roll-in to positive plate is 1.95~2.45g/
㎝3Compacted density with negative electrode tab is 1.25~1.65g/ ㎝3；
Step S40, tab forms:
Positive and negative plate is die-cut to the rectangular sheet with a tab respectively；
Step S50, lamination:
With diaphragm by the positive and negative plate being die cut according to cathode/diaphragm/anode/diaphragm/cathode/diaphragm/anode/every
Film ... anode/diaphragm/cathode/diaphragm mode is stacked together, and blend compounds band ties up fixation and forms core packet 51；
Step S60, it welds:
The positive and negative electrode tab of core packet 51 is welded together with positive connecting strap 52, negative connecting strap 53 respectively, wherein just
Pole connecting band 52 is aluminium strip, and 53 copper strips of negative connecting strap is in parallel by 2 core packets 51, positive connecting strap 52 and negative connecting strap
53 are welded on one end of positive strap 54 and negative straps 55 again respectively, positive strap 54 and negative straps 55 it is another
2 core packets 51 for being welded with connecting band (referring to Fig.1 with 2) is welded in one end parallel connection；Tab and connecting band stick high-temp glue, anode connection
The middle section of piece 54 and negative straps 55 welds together with the Positive Poles 3 of top cover 2 and negative pole 4 respectively, and pastes
Upper high-temp glue forms battery core 5；
Step S70, it assembles:
The battery core 5 being welded is bent in positive connecting strap 52 and 53 part of negative connecting strap, keeps 4 core packets 51 arranged side by side
Discharge, it is in 90 ° with top cover 2, and one layer of insulating protective film 56 is wrapped outside battery core 5；After entering shell 1 together with gasket, top
Lid 2 and shell 1 weld, and complete assembling；
Step S80, baking, fluid injection:
Battery after assembling toasted at high temperature, fluid injection；
Step S90, negative pressure is melted into:
Battery after fluid injection infiltrates electrolyte adequately inside pole piece, and carry out under vacuum conditions by standing
Chemical conversion, vacuum chemical conversion can make chemical conversion generate gas be discharged in time, avoid being discharged not in time because of gas make positive and negative anodes interface without
Method comes into full contact with, and influences the formation of SEI film, and then influence the cycle performance of battery；
Step S100, sealing, aging, partial volume:
Cell sealing after chemical conversion simultaneously passes through high temperature ageing, and carries out partial volume and laminated lithium ion battery, the mesh of aging is made
Be to keep SEI film more stable, stable SEI film is conducive to the cycle performance of battery.
Optionally, this laminated lithium ion battery can be LFP (LiFePO4), NCM (nickle cobalt lithium manganate), LCO (cobalt acid
Lithium), LMO (LiMn2O4), the systems battery such as NCA (nickel cobalt aluminium), it is preferable that laminated lithium ion battery LFP.
In a specific embodiment of the invention, for making capacity as the laminated lithium ion battery of 256Ah.
Step S10, ingredient:
PVDF, LFP, SP are uniformly dispersed in NMP according to the ratio of 2.5%:95.0%:2.5%, form anode slurry
Material；
Graphite, SP, CMC and SBR are uniformly dispersed in water according to 95.0%:2.0%:1.2%:1.8%, form cathode
Slurry；
Step S20, it is coated with:
It is 300g/m that positive and negative electrode slurry after sieving is pressed surface density respectively3And 147g/m3It is uniformly coated on and applies respectively
Have on the 12 μm of aluminium foils (i.e. plus plate current-collecting body) and 8 μm of copper foils (i.e. negative current collector) of conductive carbon layer, and reserves uncoated region
As tab area, toasted subsequently into coating machine oven；
Step S30, roll-in:
Positive and negative plate after coating baking is subjected to roll-in, roll-in compacted density is respectively 2.25g/ ㎝3And 1.55g/
㎝3；
Step S40, pole piece makes:
Positive and negative plate is die-cut to the rectangular sheet with a tab respectively, wherein positive plate size are as follows: 166*174 ㎜,
Negative electrode tab size are as follows: 169*178 ㎜, positive pole ear size are as follows: 40*20 ㎜, negative lug size are as follows: 40*18 ㎜；
Step S50, lamination:
With 20 μm of diaphragms by the positive plate 55 being die cut, negative electrode tab 56 according to cathode/diaphragm/anode/diaphragm/negative
Pole/diaphragm/anode/diaphragm ... anode/diaphragm/cathode/diaphragm mode is stacked together, and blend compounds band ties up fixation and forms core
Packet 51；
Step S60, it welds:
The positive and negative electrode tab of core packet 51 is used aluminium connecting band (i.e. positive connecting strap 52), copper connecting band respectively, and (i.e. cathode connects
Tape splicing 53) weld together, all positive pole ears are welded on one end of positive connecting strap 52, and all negative lugs are welded on
4 core packets 51 are divided into two groups of left and right by one end of negative connecting strap 53, and every group there are two core packets 51, referring to shown in Fig. 2, first
Core packet 511 and the second core packet 512 form one group, and third core packet 513 and the 4th core packet 514 form one group, positive strap 54
The positive connecting strap 52 of first end and the first core packet 511 and the second core packet 512 is welded far from one end of positive pole ear, anode connection
The second end and third core packet 513 of piece 54 and the positive connecting strap 52 of the 4th core packet 514 are welded far from one end of positive pole ear, just
The middle part of pole connection sheet 54 and Positive Poles 3 are welded；The first end of negative straps 55 and the first core packet 511 and the second core packet
512 negative connecting strap 53 is welded far from one end of negative lug, the second ends of negative straps 55 and third core packet 513 and the
The negative connecting strap 53 of four core packets 514 is welded far from one end of negative lug, and the middle part of negative straps 55 and negative pole 4 are welded
It connects；Tab, connecting band and connection sheet stick high-temp glue, form battery core 5.
Wherein, positive strap 54 is aluminium connection sheet, and negative straps 55 are copper connection sheet.
Step S70, it assembles:
The battery core 5 being welded connects band part with copper in aluminium connecting band and is bent, and discharges 4 core packets 51 side by side, with
Top cover 2 is in 90 °, and one layer of insulating protective film 56 is wrapped outside battery core 5；In the shell 1 entered together with gasket, top cover 2 with
Shell 1 welds, and completes assembling；
Step S80, baking, fluid injection:
Battery after assembling toasted at high temperature, fluid injection；
Step S90, negative pressure is melted into:
Battery after fluid injection is melted under vacuum conditions by standing；
Step S100, sealing, aging, partial volume:
Cell sealing after chemical conversion simultaneously passes through high temperature ageing, and carries out partial volume and 71173205 sides that capacity is 256Ah are made
Shape ferric phosphate lithium cell.
Above embodiments are only used to illustrate detailed protocol of the invention, and the invention is not limited to above-mentioned detailed protocols, i.e.,
Do not mean that the present invention must rely on above-mentioned detailed protocol and could implement.It should be clear to those skilled in the art, right
Any improvement of the invention, the addition of equivalence replacement and auxiliary element to each raw material of product of the present invention, the selection of concrete mode
Deng all of which fall within the scope of protection and disclosure of the present invention.
Claims (13)
1. a kind of laminated lithium ion battery, including shell, top cover and the Positive Poles and negative pole being arranged on the top cover,
The shell is in one end enclosuring structure open at one end, and the open end of the shell passes through the top seal, which is characterized in that institute
It states and is provided with battery core in shell, the battery core includes at least two core packets, and each core packet is laminated structure, Mei Gesuo
All positive pole ears for stating core packet are welded as a whole by positive connecting strap, and all negative lugs of each core packet pass through negative
Pole connecting band is welded as a whole, and all positive connecting straps are connect with the Positive Poles on the top cover, all
The negative connecting strap is connect with the negative pole on the top cover.
2. laminated lithium ion battery according to claim 1, which is characterized in that the positive plate of the core packet includes anode collection
Fluid and positive electrode, the position that the plus plate current-collecting body removes the positive pole ear are equipped with conductive carbon layer, the positive electrode
Coated on the plus plate current-collecting body equipped with the conductive carbon layer；And/or
The negative electrode tab of the core packet includes negative current collector and negative electrode material, and the negative current collector removes the negative lug
Position is equipped with conductive carbon layer, and the negative electrode material is coated on the negative current collector equipped with the conductive carbon layer.
3. laminated lithium ion battery according to claim 2, which is characterized in that the conductive carbon layer is conductive black, carbon
At least one of nanotube and electrically conductive graphite.
4. laminated lithium ion battery according to claim 2, which is characterized in that the conductive carbon layer is coated in the anode
On collector or the negative current collector.
5. laminated lithium ion battery according to claim 1, which is characterized in that the positive connecting strap is aluminium connecting band,
The negative connecting strap is copper connecting band.
6. laminated lithium ion battery according to claim 1, which is characterized in that the positive pole ear and the anode connection
It takes and is equipped with high-temp glue；And/or the negative lug and the negative connecting strap are equipped with the high-temp glue.
7. laminated lithium ion battery according to any one of claims 1 to 6, which is characterized in that all anodes are even
It is connect by positive strap with the Positive Poles on the top cover after tape splicing is in parallel, all negative connecting straps are simultaneously
It is connect by negative straps with the negative pole on the top cover after connection.
8. laminated lithium ion battery according to claim 7, which is characterized in that the battery core includes four core packets,
All positive pole ears of each core packet are welded on one end of the positive connecting strap, all cathode poles of each core packet
Ear is welded on one end of the negative connecting strap, and four core packets are respectively the first core packet of sequence setting, the second core packet, the
Three core packets and the 4th core packet；
Wherein, the one end of the positive connecting strap far from the positive pole ear of both the first core packet and described second core packet
It is connect with the first end of the positive strap, the positive connecting strap of both the third core packet and described 4th core packet
One end far from the positive pole ear is connect with the second end of the positive strap；
The one end of the negative connecting strap far from the negative lug of both the first core packet and the second core packet with
The negative connecting strap of both the first end connection of the negative straps, the third core packet and the 4th core packet is separate
One end of the negative lug is connect with the second end of the negative straps；
The middle part of the positive strap and the Positive Poles are welded, the middle part of the negative straps and the negative pole
Welding.
9. laminated lithium ion battery according to any one of claims 1 to 6, which is characterized in that the battery core includes four
The core packet, four core packets are emitted in the shell and vertical with the top cover side by side, and the battery core is coated with
Insulating protective film.
10. laminated lithium ion battery according to claim 9, which is characterized in that four core packets are respectively sequentially set
It sets in the intracorporal first core packet of shell, the second core packet, third core packet and the 4th core packet；
The positive connecting strap include the first positive connecting strap and the second positive connecting strap, the first of first positive connecting strap
End and all positive pole ears of the first core packet weld, the second end of first positive connecting strap and the described 4th
All positive pole ear welding of core packet, the first end of second positive connecting strap are all with the second core packet
The positive pole ear welding, all positive pole ears of the second end of second positive connecting strap and the third core packet
Welding, first positive connecting strap and the second positive connecting strap parallel connection and the Positive Poles are welded；
The negative connecting strap include the first negative connecting strap and the second negative connecting strap, the first of first negative connecting strap
End and all negative lugs of the first core packet are welded, the second end of first negative connecting strap and the described 4th
All negative lug welding of core packet, the first end of second negative connecting strap are all with the second core packet
The negative lug welding, all negative lugs of the second end of second negative connecting strap and the third core packet
Welding, first negative connecting strap and the second negative connecting strap parallel connection and the negative pole are welded.
11. a kind of production method of laminated lithium ion battery, which is characterized in that manufacture is as described in any one of claims 1 to 10
Laminated lithium ion battery；
All positive pole ears of core packet after making lamination are welded as a whole by positive connecting strap, make all cathode of the core packet
Tab is welded as a whole by negative connecting strap；
It connect all positive connecting straps with Positive Poles, connect all negative connecting straps with negative pole,
Form battery core；
The battery core is set to carry out laminated lithium ion battery described in assembling procedure assembled formation.
12. production method according to claim 11, which is characterized in that make the laminated lithium ion battery of assembled formation
Successively carry out roasting procedure, fluid injection process and negative pressure of vacuum formation process.
13. production method according to claim 11, which is characterized in that before the core packet lamination, in plus plate current-collecting body
Upper coating conductive carbon layer coats anode sizing agent in conductive carbon layer and forms positive plate, conductive carbon layer is coated on negative current collector,
Negative electrode slurry is coated in conductive carbon layer forms negative electrode tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595421.8A CN109687011B (en) | 2018-12-25 | Laminated lithium ion battery and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595421.8A CN109687011B (en) | 2018-12-25 | Laminated lithium ion battery and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN109687011A true CN109687011A (en) | 2019-04-26 |
| CN109687011B CN109687011B (en) | 2024-05-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111403820A (en) * | 2020-03-27 | 2020-07-10 | 湖北亿纬动力有限公司 | Core pack and manufacturing method thereof, single battery and manufacturing method and module thereof |
| CN111769289A (en) * | 2020-06-18 | 2020-10-13 | 合肥国轩高科动力能源有限公司 | Welding method of flexible current collector |
| CN112599934A (en) * | 2020-12-17 | 2021-04-02 | 合肥国轩高科动力能源有限公司 | Method for assembling winding core of lithium battery |
| CN113707972A (en) * | 2021-09-22 | 2021-11-26 | 合肥国轩高科动力能源有限公司 | CTP high-integration lithium ion battery and manufacturing method thereof |
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| CN103178292A (en) * | 2013-02-05 | 2013-06-26 | 中聚电池研究院有限公司 | Lithium ion battery and assembly method thereof |
| CN203071159U (en) * | 2013-02-27 | 2013-07-17 | 湖南桑顿新能源有限公司 | Plastic casing lithium ion secondary battery with multiple cell wraps |
| CN209312934U (en) * | 2018-12-25 | 2019-08-27 | 湖北金泉新材料有限责任公司 | A kind of laminated lithium ion battery |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103178292A (en) * | 2013-02-05 | 2013-06-26 | 中聚电池研究院有限公司 | Lithium ion battery and assembly method thereof |
| CN203071159U (en) * | 2013-02-27 | 2013-07-17 | 湖南桑顿新能源有限公司 | Plastic casing lithium ion secondary battery with multiple cell wraps |
| CN209312934U (en) * | 2018-12-25 | 2019-08-27 | 湖北金泉新材料有限责任公司 | A kind of laminated lithium ion battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111403820A (en) * | 2020-03-27 | 2020-07-10 | 湖北亿纬动力有限公司 | Core pack and manufacturing method thereof, single battery and manufacturing method and module thereof |
| CN111769289A (en) * | 2020-06-18 | 2020-10-13 | 合肥国轩高科动力能源有限公司 | Welding method of flexible current collector |
| CN111769289B (en) * | 2020-06-18 | 2023-04-07 | 合肥国轩高科动力能源有限公司 | Welding method of flexible current collector |
| CN112599934A (en) * | 2020-12-17 | 2021-04-02 | 合肥国轩高科动力能源有限公司 | Method for assembling winding core of lithium battery |
| CN112599934B (en) * | 2020-12-17 | 2022-04-19 | 合肥国轩高科动力能源有限公司 | Method for assembling winding core of lithium battery |
| CN114512774A (en) * | 2020-12-17 | 2022-05-17 | 合肥国轩高科动力能源有限公司 | Method for assembling winding core of lithium battery |
| CN113707972A (en) * | 2021-09-22 | 2021-11-26 | 合肥国轩高科动力能源有限公司 | CTP high-integration lithium ion battery and manufacturing method thereof |
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