CN104810561B - A kind of preparation method of electric core of lithium ion power battery - Google Patents

A kind of preparation method of electric core of lithium ion power battery Download PDF

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Publication number
CN104810561B
CN104810561B CN201410102684.6A CN201410102684A CN104810561B CN 104810561 B CN104810561 B CN 104810561B CN 201410102684 A CN201410102684 A CN 201410102684A CN 104810561 B CN104810561 B CN 104810561B
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Prior art keywords
diaphragm
negative plate
positive
battery core
positive plate
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CN201410102684.6A
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CN104810561A (en
Inventor
吕豪杰
金荣在
李青柱
高新宝
陈军
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Wanxiang A123 Systems Asia Co Ltd
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Wanxiang Group Corp
Wanxiang A123 Systems Asia Co Ltd
Wanxiang Electric Vehicle Co Ltd
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    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a kind of preparation methods of electric core of lithium ion power battery, battery core is made of positive plate, diaphragm, negative plate, battery core includes the positive plate of 2 and 2 or more, diaphragm is equipped between adjacent positive piece, lamination forms positive plate group, battery core includes the negative plate of 2 and 2 or more, and diaphragm is equipped between adjacent cathode piece, and lamination forms negative plate group；The centre and both sides of positive plate group and negative plate group set one layer of diaphragm respectively again, and winding is fabricated to battery core.The battery core production method that the present invention is combined using lamination winding, have the small internal resistance of cell, good heavy current, multiplying power discharging temperature and rise low lamination advantage, battery core is fabricated to by winding method simultaneously, solves the disadvantage that it is more serious to play drum for pole piece edge in cyclic process.

Description

A kind of preparation method of electric core of lithium ion power battery
Technical field
The present invention relates to lithium-ion-power cell manufacturing field, more particularly, to a kind of system of electric core of lithium ion power battery Preparation Method.
Background technology
Lithium-ion-power cell has voltage high, and energy density is big, and good cycle, self discharge is small, memory-less effect, work Make the advantages that temperature range is wide.
The structure of general lithium-ion-power cell can be mainly divided into two major class：1st, with Z-shaped laminar, by multi-disc just The battery core that pole piece, diaphragm, multi-disc negative plate are alternate and are formed, then connects external terminal, is put into aluminum plastic film, makes battery. 2nd, with coiling form, a positive plate, diaphragm, a negative plate winding is made into battery core, external terminal is then connected, is put into aluminium In plastic film or hard shell, battery is made.The battery made of Z-shaped lamination process, has that the internal resistance of cell is small, heavy-current discharge performance Good, multiplying power discharging temperature rises low advantage, but there are pole piece edges in low production efficiency, unsuitable hard shell battery, cyclic process Play the shortcomings of drum is more serious.The battery made of winding method has high production efficiency, cyclic process pole piece stabilization, battery The advantages that strong applicability, but there are the shortcomings of the internal resistance of cell is high, heavy-current discharge performance is poor, the raising of multiplying power discharging temperature.
In patent CN102208679A, by way of being left white in positive and negative electrode pole piece bending part, while multi pole ears side is used Formula makes lithium-ion-power cell using winding method.The battery made of the method can improve the same of production efficiency When, take into account heavy-current discharge；But it is left white that dimension control is more difficult, blank space collector is fragile in winding process there are pole piece The shortcomings that damage.
Invention content
The present invention is part in order to overcome the above-mentioned deficiencies of the prior art, and it is unknown to provide that a kind of internal resistance is small, edge plays drum The preparation method of aobvious electric core of lithium ion power battery.
To achieve these goals, the present invention uses following technical scheme：
A kind of preparation method of electric core of lithium ion power battery, battery core are made of positive plate, diaphragm, negative plate, battery core packet Containing the positive plate of 2 and 2 or more, diaphragm is equipped between adjacent positive piece, lamination forms positive plate group, and battery core includes 2 and 2 Above negative plate, diaphragm is equipped between adjacent cathode piece, and lamination forms negative plate group；The centre of positive plate group and negative plate group and Both sides set one layer of diaphragm respectively again, and winding is fabricated to battery core.
The present invention has that the internal resistance of cell is small, heavy-current discharge performance using the battery core production method that is combined of lamination winding Good, multiplying power discharging temperature rises low lamination advantage, while is fabricated to battery core by winding method, solves pole piece edge in cyclic process Play the shortcomings that drum is more serious.In addition, the battery core that multiple pole piece layer poststacks are wound into, because the length of single pole piece can be shorter, Therefore this structure can be applicable in large volume of battery core, so the electric core of lithium ion power battery that the present invention makes is adapted to Soft Roll With a variety of type batteries of hard shell, technology versatility is enhanced.
Preferably, diaphragm grows positive plate both sides of the edge 0.3mm~1.5mm, diaphragm grows negative plate both sides of the edge 0.3mm~1.5mm.Membrane tension, diaphragm and positive and negative plate Edge Distance are controlled, slows down pole piece edge in cyclic process and plays drum Degree.
Preferably, the positive and negative plate is made using punching mode.
Preferably, the lug direction of all positive plates is same direction, it is welded as a whole；The lug side of all negative plates To for same direction, it is welded as a whole.
Preferably, the lug direction of positive plate and the lug direction of negative plate are same direction.
Preferably, the lug direction of positive plate and the lug direction of negative plate are opposite direction.
Advantageous effect：
（1）Lithium-ion-power cell is made using spooled laminations mode, production efficiency can be greatly improved.
（2）The battery made of this mode, the internal resistance of cell is low, meets big multiplying power discharging requirement, and multiplying power discharging temperature rises low.
（3）By spooled laminations mode, membrane tension, diaphragm and positive and negative plate Edge Distance are controlled, slows down cyclic process Play drum degree in middle pole piece edge.
（4）Lithium-ion-power cell is made using spooled laminations mode, is adapted to Soft Roll and a variety of type electricity of hard shell Pond enhances technology versatility.
Specific embodiment
The present invention will be further described With reference to embodiment.
Embodiment 1：
Prepare positive plate：Mix the LiFePO4 of 90 parts by weight（LiFePO4）, the conductive black SP of 4 parts by weight, 1 weight The carbon phase grown carbon fiber of part（VGCF）And 5 parts by weight Kynoar, and add 85 parts by weight N-N dimethyl pyrazoles Pyrrolidone stirs to form slurries, is uniformly coated on anode base flow body rolling aluminum foil, is rolled, rushed with roller after dry Positive plate is made in piece.
Prepare negative plate：Mix the Delanium of 95 parts by weight, the conductive black SP of 1 parts by weight, the carboxylic first of 1.5 parts by weight The butadiene-styrene rubber (SBR) of base sodium cellulosate (CMC) and 2.5 parts by weight, and the deionized water for adding 150 parts by weight stirs to be formed Slurries are uniformly coated on cathode base flow body electrolytic copper foil, are rolled after dry with roller, punching, negative plate is made.
Prepare diaphragm：Diaphragm uses thickness as 30 microns of polypropylene screen（PP）, 280 cm of air permeability3/ sec, porosity 42%。
Prepare electrolyte：Electrolyte using 1.3mol/L lithium hexafluoro phosphate be dissolved into dimethyl carbonate, methyl ethyl carbonate, Ethylene carbonate, propylene carbonate ester ORGANIC SOLVENT MIXTURES in, wherein dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate, The volume ratio of propylene carbonate ester is（40:40:13:7）.
Prepare shell：Shell uses aluminum plastic film, and aluminum plastic film uses thickness to have nylon layer, adhesive layer, PP for 152 microns Layer, adhesive layer, aluminium foil, adhesive layer, PP shape sandwich layer by layer.
Prepare battery：3 above-mentioned positive plates are selected, diaphragm is equipped between adjacent positive piece, lamination forms positive plate group.It selects 3 above-mentioned negative plates, diaphragm is equipped between adjacent cathode piece, and lamination forms negative plate group；The centre of positive plate group and negative plate group One layer of diaphragm is set respectively again with both sides, then winding is fabricated to battery core.Diaphragm grows positive plate both sides of the edge 0.3mm, diaphragm Grow negative plate both sides of the edge 0.3mm.The lug direction of all positive plates is same direction, is welded as a whole；All negative plates Lug direction for same direction, be welded as a whole.The lug direction of positive plate and the lug direction of negative plate are same direction. Then aluminum plastic film heat-sealing is carried out, injects electrolyte, heat-sealing sealing；It carries out shelving-preliminary filling-evacuation-chemical conversion-partial volume successively, be made 20Ah lithium-ion-power cells.
Embodiment 2：
Positive plate, negative plate, diaphragm, electrolyte, shell are prepared using the preparation method identical with embodiment 1.
Prepare battery：2 above-mentioned positive plates are selected, diaphragm is equipped between adjacent positive piece, lamination forms positive plate group.It selects 2 above-mentioned negative plates, diaphragm is equipped between adjacent cathode piece, and lamination forms negative plate group；The centre of positive plate group and negative plate group One layer of diaphragm is set respectively again with both sides, winding is fabricated to battery core.Diaphragm grows positive plate both sides of the edge 1.5mm, and diaphragm is grown Negative plate both sides of the edge 1.5mm.The lug direction of all positive plates is same direction, is welded as a whole；The pole of all negative plates Ear direction is same direction, is welded as a whole.The lug direction of positive plate and the lug direction of negative plate are opposite direction.Then Aluminum plastic film heat-sealing is carried out, injects electrolyte, heat-sealing sealing；It carries out shelving-preliminary filling-evacuation-chemical conversion-partial volume successively, 20Ah is made Lithium-ion-power cell.
Comparative example 1：
Positive plate, negative plate, diaphragm, electrolyte, shell are prepared using the preparation method identical with embodiment 1.
Prepare battery：Select 3 above-mentioned positive plates, 3 above-mentioned negative plates, with Z-shaped laminar, by positive plate, every The alternate lamination of film, negative plate forms battery core, soldering polar ear, and positive and negative lug is equidirectional；Then aluminum plastic film heat-sealing, injection are carried out Electrolyte, heat-sealing sealing；It carries out shelving-preliminary filling-evacuation-chemical conversion-partial volume successively, 20Ah lithium-ion-power cells is made.
Comparative example 2：
Positive plate, negative plate, diaphragm, electrolyte, shell are prepared using the preparation method identical with embodiment 1.
Prepare battery：Select the above-mentioned positive plate of monolithic, the above-mentioned negative plate of monolithic, in a manner of convoluted, by positive plate, every The alternate winding of film, negative plate forms battery core, and positive and negative lug is equidirectional；Then aluminum plastic film heat-sealing is carried out, injects electrolyte, envelope Mouthful；It carries out shelving-preliminary filling-evacuation-chemical conversion-partial volume successively, 20Ah lithium-ion-power cells is made.
Table 1 is that the battery core production efficiency of above-mentioned comparative example and above-described embodiment, battery AC internal Resistance, multiplying power discharging capacity are protected Holdup, multiplying power discharging battery Wen Sheng, circulating battery play drum degree comparing result.

Claims (6)

1. a kind of preparation method of electric core of lithium ion power battery, battery core are made of positive plate, diaphragm, negative plate, feature exists In battery core includes the positive plate of 2 and 2 or more, and diaphragm is equipped between adjacent positive piece, and lamination forms positive plate group, battery core packet Containing the negative plate of 2 and 2 or more, diaphragm is equipped between adjacent cathode piece, lamination forms negative plate group；Positive plate group and negative plate The centre and both sides of group set one layer of diaphragm respectively again, and winding is fabricated to battery core.
2. the preparation method of a kind of electric core of lithium ion power battery according to claim 1, which is characterized in that diaphragm is grown Positive plate both sides of the edge 0.3mm~1.5mm, diaphragm grow negative plate both sides of the edge 0.3mm~1.5mm.
3. a kind of preparation method of electric core of lithium ion power battery according to claim 1, which is characterized in that it is described just, Negative plate is made using punching mode.
A kind of 4. preparation method of electric core of lithium ion power battery according to claim 1, which is characterized in that all anodes The lug direction of piece is same direction, is welded as a whole；The lug direction of all negative plates is same direction, is welded as a whole.
5. the preparation method of a kind of electric core of lithium ion power battery according to claim 4, which is characterized in that positive plate Lug direction and the lug direction of negative plate are same direction.
6. the preparation method of a kind of electric core of lithium ion power battery according to claim 4, which is characterized in that positive plate Lug direction and the lug direction of negative plate are opposite direction.
CN201410102684.6A 2014-03-20 2014-03-20 A kind of preparation method of electric core of lithium ion power battery Active CN104810561B (en)

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JP2023533089A (en) 2020-06-02 2023-08-02 寧徳時代新能源科技股▲分▼有限公司 Electrode assembly and its associated battery, device, manufacturing method, and manufacturing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1540792A (en) * 2003-10-31 2004-10-27 中信国安盟固利电源技术有限公司 Method for making core of soft packaged lithium ion dynamic battery
CN102208679A (en) * 2011-05-09 2011-10-05 上海唐一新能源科技有限公司 Wound continuous laminated square lithium ion power battery

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101867058B (en) * 2010-07-09 2012-04-04 湖南科霸汽车动力电池有限责任公司 Manufacturing method for electric core
CN102231433A (en) * 2011-05-25 2011-11-02 万向电动汽车有限公司 Lithium ion battery
CN102361068A (en) * 2011-10-24 2012-02-22 深圳市格瑞普电池有限公司 Pole piece for lithium ion battery, laminated lithium ion battery and preparation method of laminated lithium ion battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1540792A (en) * 2003-10-31 2004-10-27 中信国安盟固利电源技术有限公司 Method for making core of soft packaged lithium ion dynamic battery
CN102208679A (en) * 2011-05-09 2011-10-05 上海唐一新能源科技有限公司 Wound continuous laminated square lithium ion power battery

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Address after: 311215 Xiaoshan economic and Technological Development Zone, Zhejiang District, No. two road, building No. 855, No.

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Patentee before: Wanxiang A123 Co.,Ltd.

Patentee before: WANXIANG EV Co.,Ltd.

Patentee before: WANXIANG GROUP Co.,Ltd.