CN103346346A - High-performance long-life lithium battery - Google Patents

High-performance long-life lithium battery Download PDF

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Publication number
CN103346346A
CN103346346A CN2013102331413A CN201310233141A CN103346346A CN 103346346 A CN103346346 A CN 103346346A CN 2013102331413 A CN2013102331413 A CN 2013102331413A CN 201310233141 A CN201310233141 A CN 201310233141A CN 103346346 A CN103346346 A CN 103346346A
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CN
China
Prior art keywords
lithium battery
layer
thickness
service life
composite diaphragm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013102331413A
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Chinese (zh)
Inventor
聂权
邓腾彬
黄珍珍
邓华
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DONGGUAN TIANNAN OPTICAL TECHNOLOGY Co Ltd
Institute of Electronic and Information Engineering of Dongguan UESTC
Original Assignee
DONGGUAN TIANNAN OPTICAL TECHNOLOGY Co Ltd
Institute of Electronic and Information Engineering of Dongguan UESTC
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Application filed by DONGGUAN TIANNAN OPTICAL TECHNOLOGY Co Ltd, Institute of Electronic and Information Engineering of Dongguan UESTC filed Critical DONGGUAN TIANNAN OPTICAL TECHNOLOGY Co Ltd
Priority to CN2013102331413A priority Critical patent/CN103346346A/en
Publication of CN103346346A publication Critical patent/CN103346346A/en
Pending legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a high-performance long-life lithium battery, comprising a laminated core of the lithium battery and a composite packaging layer cladded over the external surface of the laminated core of the lithium battery, wherein the laminated core of the lithium battery comprises an upper composite diaphragm layer, a positive plate layer, a middle composite diaphragm layer, a negative plate layer and a lower composite diaphragm layer which are successively laminated, the positive plate layer and the negative plate layer are respectively provided with a tab extending out from the composite packaging layer, each tab is wrapped by an insulating glue, and the upper part of the insulating glue radially protrudes to form an annular projection. The lithium battery provided by the invention is a secondary lithium battery with the advantages of an ingenious and reasonable structural design, a long life, high specific capacity, a stable structure, abundant raw material resources, good security, no pollution to the environment and a substantially prolonged life of cycle use. Moreover, the integral structure of the lithium battery is simple and compact, manufacturing of the lithium battery is easy, a production period is substantially shortened, production efficiency is improved, and a whole manufacturing process for the lithium battery is simple, can be easily realized, needs low cost, effectively guarantees product quality and is beneficial for wide popularization and application.

Description

The high performance and long service life lithium battery
Technical field
The present invention relates to technical field of lithium batteries, be specifically related to a kind of high performance and long service life lithium battery.
Background technology
Ubiquitous lithium ion battery in the market just, the performance of its performance and lithium ion battery material is closely related.Therefore the development course of lithium ion battery is accompanied by innovation and the breakthrough of battery material, specifically comprises positive and negative electrode material, electrolyte, barrier film etc., and wherein positive and negative electrode material and electrolyte also are the emphasis of Study on Li-ion batteries using to the having the greatest impact of battery.
Modern society generally uses lithium ion battery in people's life, work, the lithium ion battery of selling on the market is varied, and it has different design concepts separately, makes every effort to reach the instructions for use of different user.Though but these lithium ion batteries can roughly satisfy instructions for use, design all not very ingeniously, its volume is big, occurs short circuit easily, influences fail safe and the serviceability of battery, and useful life is short.
Summary of the invention
At above-mentioned deficiency, one of purpose of the present invention is, provides a kind of structural design ingenious, reasonable, and performance is good, and long service life, safe high performance and long service life lithium battery.
For achieving the above object, technical scheme provided by the present invention is: a kind of high performance and long service life lithium battery, the composite packaging layer that it comprises the stacked core body of lithium battery and is coated on this lithium battery laminated cores external surface, described lithium battery laminated cores comprises stacked successively last composite diaphragm layer, anodal lamella, middle composite diaphragm layer, negative pole lamella and following composite diaphragm layer, be respectively equipped with the lug that stretches out described composite packaging layer on described anodal lamella and the negative pole lamella, be coated with insulating cement on this lug, the top radial protrusion of this insulating cement forms an annular projection.Be provided with annular projection, can effectively avoid on the one hand at winding process membrane layer being produced extruding, thereby the stability of the stacked core body of whole lithium battery is improved; Can be concordant with the positive and negative electrode lamella when making the lug welding on the other hand, avoid the lug inflection to increase the thickness of the stacked core body of lithium battery, thereby promote energy content of battery density.Simultaneously can effectively avoid easily causing in encapsulation process the generation of short circuit phenomenon, thereby make that the security performance of whole flexible package lithium cell is effectively improved.
As a kind of improvement of the present invention, described composite packaging layer comprises by basic unit, the bonding layer of polyurethane, soft aluminium foil layer, epoxy adhesive layer and modification cast polypropylene film layer in the order from the inside to the outside stacked nylon successively.Adopt the epoxy adhesive layer, make the peel strength height of soft aluminium foil layer and modification cast polypropylene film layer, high-barrier makes the lithium battery performance keep stable under electrolyte soaks, and heat sealing property is good, and is suitable cold stamping shaped.
As a kind of improvement of the present invention, the thickness of basic unit is 30um～48um in the described nylon, the thickness of the bonding layer of polyurethane is 15um～25um, the thickness of described soft aluminium foil layer is 28um～32um, the thickness of described soft aluminium foil layer is 30um～42um, the thickness of described epoxy adhesive layer is 18um～25um, and the thickness of described modification cast polypropylene film layer is 18um～24um.
As a kind of improvement of the present invention, described anodal lamella mixes by following raw materials by weight percent: anode sizing agent 44～46%: solvent 54～56%, wherein anode sizing agent mixes by following raw materials by weight percent: LiMn2O4 42～57%, nickle cobalt lithium manganate 38～50%, conductive agent 4～5%, binding agent 1～3%.
As a kind of improvement of the present invention, described negative pole lamella mixes by following raw materials by weight percent: cathode size 28～32%: solvent 68～72%, wherein cathode size mixes by following raw materials by weight percent: graphite 90～92%, conductive black 4～5%, binding agent 4～5%.
As a kind of improvement of the present invention, described upward composite diaphragm layer and following composite diaphragm layer be three layers of microporous compound film for being made of Celgard-2300PP, PE and PP all.
As a kind of improvement of the present invention, the double-layered compound film of described middle composite diaphragm layer for being constituted by polypropylene and polyethylene.
As a kind of improvement of the present invention, the length that described lug stretches out from described composite packaging layer is 1.8～2.8mm.
As a kind of improvement of the present invention, the thickness of described anodal lamella is 0.5～0.9mm, and the thickness of described negative pole lamella is 0.08～0.35mm.
As a kind of improvement of the present invention, the described thickness of going up composite diaphragm layer, middle composite diaphragm layer and following composite diaphragm layer is 0.03～0.05mm.
Beneficial effect of the present invention is: structural design of the present invention is ingenious, reasonable, and the life-span is long, specific capacity is high, Stability Analysis of Structures, raw material resources abundant, fail safe is good, and secondary free from environmental pollution buries ion battery, and has improved greatly and recycle the life-span.Overall structure of the present invention is simple, compact in addition, and is easy to manufacture, shortens the production cycle greatly, enhances productivity, and whole production process is succinct, is easy to realize, cost is low and effectively guarantee product quality, is beneficial to wide popularization and application.
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Description of drawings
Fig. 1 is perspective view of the present invention.
Fig. 2 is the sectional structure schematic diagram of the stacked core body of lithium battery among Fig. 1.
Embodiment
Embodiment 1, referring to Fig. 1 and Fig. 2, a kind of high performance and long service life lithium battery that present embodiment provides, the composite packaging layer 2 that it comprises the stacked core body 1 of lithium battery and is coated on stacked core body 1 outer surface of this lithium battery, described lithium battery laminated cores comprises stacked successively last composite diaphragm layer 21, anodal lamella 22, middle composite diaphragm layer 23, negative pole lamella 24 and following composite diaphragm layer 25, be respectively equipped with the lug 3 that stretches out described composite packaging layer 2 on described anodal lamella 22 and the negative pole lamella 24, be coated with insulating cement 4 on this lug 3, the top radial protrusion of this insulating cement 4 forms an annular projection 41.Structural design of the present invention is ingenious, reasonable, and the life-span is long, specific capacity is high, Stability Analysis of Structures, raw material resources abundant, fail safe is good, and secondary free from environmental pollution buries ion battery, and has improved greatly and recycle the life-span.Overall structure of the present invention is simple, compact in addition, and is easy to manufacture, shortens the production cycle greatly, enhances productivity, and whole production process is succinct, is easy to realize, cost is low and effectively guarantee product quality, is beneficial to wide popularization and application.
The thickness of basic unit is 30um～48um in the described nylon, and thickness is preferably 40um.The thickness of the bonding layer of polyurethane is 15um～25um, and thickness is preferably 22um.The thickness of described soft aluminium foil layer is 28um～32um, and thickness is preferably 30um.The thickness of described soft aluminium foil layer is 30um～42um, and thickness is preferably 38um.The thickness of described epoxy adhesive layer is 18um～25um, and thickness is preferably 23um.The thickness of described modification cast polypropylene film layer is 18um～24um, and thickness is preferably 22um.
Described upward composite diaphragm layer 21 and following composite diaphragm layer 25 be three layers of microporous compound film for being made of Celgard-2300PP, PE and PP all.
The double-layered compound film of composite diaphragm layer 23 for being constituted by polypropylene and polyethylene in described.
The length that described lug 3 stretches out from described composite packaging layer 2 is 1.8～2.8mm.Thickness is preferably 22um.
The thickness of described anodal lamella 22 is 0.5～0.9mm, and thickness is preferably 0.7mm.The thickness of described negative pole lamella 24 is 0.08～0.35mm, and thickness is preferably 0.2mm.。
The described thickness of going up composite diaphragm layer 21, middle composite diaphragm layer 23 and following composite diaphragm layer 25 is 0.03～0.05mm, and thickness is preferably 0.04um.
Be provided with annular projection 41, can effectively avoid on the one hand at winding process membrane layer being produced extruding, thereby the stability of the stacked core body 1 of whole lithium battery is improved; Can be concordant with positive and negative electrode lamella 24 when making lug 3 welding on the other hand, avoid lug 3 inflection to increase the thickness of the stacked core body 1 of lithium battery, thereby promote energy content of battery density.Simultaneously can effectively avoid easily causing in encapsulation process the generation of short circuit phenomenon, thereby make that the security performance of whole flexible package lithium cell is effectively improved.
Described composite packaging layer 2 comprises by basic unit, the bonding layer of polyurethane, soft aluminium foil layer, epoxy adhesive layer and modification cast polypropylene film layer in the order from the inside to the outside stacked nylon successively.Adopt the epoxy adhesive layer, make the peel strength height of soft aluminium foil layer and modification cast polypropylene film layer, high-barrier makes the lithium battery performance keep stable under electrolyte soaks, and heat sealing property is good, and is suitable cold stamping shaped.
Described anodal lamella 22 mixes by following raw materials by weight percent: anode sizing agent 44%: solvent 56%, wherein anode sizing agent mixes by following raw materials by weight percent: LiMn2O4 42%, nickle cobalt lithium manganate 50%, conductive agent 5%, binding agent 3%.
Described negative pole lamella 24 mixes by following raw materials by weight percent: cathode size 32%: solvent 68%, wherein cathode size mixes by following raw materials by weight percent: graphite 91%, conductive black 4.5%, binding agent 4.5%.
Embodiment 2, a kind of high performance and long service life lithium battery that present embodiment provides, it is substantially the same manner as Example 1, distinctive points is, described anodal lamella 22 mixes by following raw materials by weight percent: anode sizing agent 46%: solvent 54%, and wherein anode sizing agent mixes by following raw materials by weight percent: LiMn2O4 57%, nickle cobalt lithium manganate 38%, conductive agent 4%, binding agent 1%.
Described negative pole lamella 24 mixes by following raw materials by weight percent: cathode size 28%: solvent 72%, wherein cathode size mixes by following raw materials by weight percent: graphite 92%, conductive black 4%, binding agent 4%.
Embodiment 3, a kind of high performance and long service life lithium battery that present embodiment provides, it is substantially the same manner as Example 1, distinctive points is, described anodal lamella 22 mixes by following raw materials by weight percent: anode sizing agent 45%: solvent 55%, and wherein anode sizing agent mixes by following raw materials by weight percent: LiMn2O4 53%, nickle cobalt lithium manganate 40.5%, conductive agent 4.5%, binding agent 2%.
Described negative pole lamella 24 mixes by following raw materials by weight percent: cathode size 30%: solvent 70%, wherein cathode size mixes by following raw materials by weight percent: graphite 90%, conductive black 5%, binding agent 5%.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the present invention is not limited to above-mentioned embodiment, and any apparent improvement, replacement or modification that every those skilled in the art have done on basis of the present invention all belong to protection scope of the present invention.In addition, although used some specific terms in this specification, these terms do not constitute any restriction to the present invention just for convenience of description.As described in the above embodiment of the present invention, adopt structure same or analogous with it and the battery of other structure of obtaining, all in protection range of the present invention.

Claims (10)

1. high performance and long service life lithium battery, it is characterized in that: the composite packaging layer that it comprises the stacked core body of lithium battery and is coated on this lithium battery laminated cores external surface, described lithium battery laminated cores comprises stacked successively last composite diaphragm layer, anodal lamella, middle composite diaphragm layer, negative pole lamella and following composite diaphragm layer, be respectively equipped with the lug that stretches out described composite packaging layer on described anodal lamella and the negative pole lamella, be coated with insulating cement on this lug, the top radial protrusion of this insulating cement forms an annular projection.
2. high performance and long service life lithium battery according to claim 1, it is characterized in that described composite packaging layer comprises by basic unit, the bonding layer of polyurethane, soft aluminium foil layer, epoxy adhesive layer and modification cast polypropylene film layer in the order from the inside to the outside stacked nylon successively.
3. high performance and long service life lithium battery according to claim 2, it is characterized in that, the thickness of basic unit is 30um～48um in the described nylon, the thickness of the bonding layer of polyurethane is 15um～25um, the thickness of described soft aluminium foil layer is 28um～32um, the thickness of described soft aluminium foil layer is 30um～42um, and the thickness of described epoxy adhesive layer is 18um～25um, and the thickness of described modification cast polypropylene film layer is 18um～24um.
4. high performance and long service life lithium battery according to claim 1, it is characterized in that, described anodal lamella mixes by following raw materials by weight percent: anode sizing agent 44～46%: solvent 54～56%, wherein anode sizing agent mixes by following raw materials by weight percent: LiMn2O4 42～57%, nickle cobalt lithium manganate 38～50%, conductive agent 4～5%, binding agent 1～3%.
5. high performance and long service life lithium battery according to claim 1, it is characterized in that, described negative pole lamella mixes by following raw materials by weight percent: cathode size 28～32%: solvent 68～72%, wherein cathode size mixes by following raw materials by weight percent: graphite 90～92%, conductive black 4～5%, binding agent 4～5%.
6. high performance and long service life lithium battery according to claim 1 is characterized in that, described upward composite diaphragm layer and following composite diaphragm layer be three layers of microporous compound film for being made of Celgard-2300PP, PE and PP all.
7. high performance and long service life lithium battery according to claim 1 is characterized in that, the double-layered compound film of described middle composite diaphragm layer for being made of polypropylene and polyethylene.
8. high performance and long service life lithium battery according to claim 1 is characterized in that, the length that described lug stretches out from described composite packaging layer is 1.8～2.8mm.
9. high performance and long service life lithium battery according to claim 1 is characterized in that, the thickness of described anodal lamella is 0.5～0.9mm, and the thickness of described negative pole lamella is 0.08～0.35mm.
10. high performance and long service life lithium battery according to claim 1 is characterized in that, the described thickness of going up composite diaphragm layer, middle composite diaphragm layer and following composite diaphragm layer is 0.03～0.05mm.
CN2013102331413A 2013-06-13 2013-06-13 High-performance long-life lithium battery Pending CN103346346A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852030A (en) * 2015-04-14 2015-08-19 浙江超威创元实业有限公司 High-capacity and high-safety software package battery core

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002033123A (en) * 2000-07-14 2002-01-31 Yuasa Corp Film package battery
CN101914363A (en) * 2010-07-28 2010-12-15 吕方龙 Lithium cell packaging film and polyurethane adhesive therefor
CN202134604U (en) * 2011-06-20 2012-02-01 曙鹏科技（深圳）有限公司 Cell of lithium battery with flexible package and lithium battery with flexible package
CN102593504A (en) * 2011-01-13 2012-07-18 苏州能斯特新能源有限公司 Long-life lithium iron phosphate/hard carbon flexible package lithium battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002033123A (en) * 2000-07-14 2002-01-31 Yuasa Corp Film package battery
CN101914363A (en) * 2010-07-28 2010-12-15 吕方龙 Lithium cell packaging film and polyurethane adhesive therefor
CN102593504A (en) * 2011-01-13 2012-07-18 苏州能斯特新能源有限公司 Long-life lithium iron phosphate/hard carbon flexible package lithium battery
CN202134604U (en) * 2011-06-20 2012-02-01 曙鹏科技（深圳）有限公司 Cell of lithium battery with flexible package and lithium battery with flexible package

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852030A (en) * 2015-04-14 2015-08-19 浙江超威创元实业有限公司 High-capacity and high-safety software package battery core

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