CN102185160A - Extremely-low impedance heat flat sealing method for forward lamination of large plates and diaphragms - Google Patents
Extremely-low impedance heat flat sealing method for forward lamination of large plates and diaphragms Download PDFInfo
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- CN102185160A CN102185160A CN201110101238XA CN201110101238A CN102185160A CN 102185160 A CN102185160 A CN 102185160A CN 201110101238X A CN201110101238X A CN 201110101238XA CN 201110101238 A CN201110101238 A CN 201110101238A CN 102185160 A CN102185160 A CN 102185160A
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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
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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
- 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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Abstract
The invention discloses an extremely-low impedance heat flat sealing method for the forward lamination of large plates and diaphragms, which belongs to the technical field of lithium battery preparation. The method comprises the following steps of: sequentially laminating a positive plate, the polymer diaphragm, a negative plate, the polymer diaphragm and the positive plate along the uncoiling direction of the diaphragm; and placing the laminated large plates and diaphragms between an upper roller and a lower roller, and performing rolling heat flat sealing by adopting lower hard roller surface heating and upper soft roller surface heating and pressing methods to manufacture a stable monolithic cell unit, wherein contact interfaces between the positive and negative plates and the diaphragms are tightly adhered. The monolithic cell unit manufactured by the method has low conductive impedance and long cycle life, and is safe to use. The method is simple and high in rate of finished products and simultaneously suitable for cells with the positive plate side lengths of less than 300mm.
Description
Technical field
The invention belongs to lithium energy cell preparation technical field, the flat method of closing of the forward stacked super-low impedance heat of particularly a kind of large-scale pole piece barrier film.
Background technology
Be subjected to an urgent demand of fossil energy exhaustion and environmental protection, the novel clean renewable energy resources are arisen at the historic moment, and especially lithium can gain great popularity by power supply.Lithium can receive global concern in electric motor car, mobile power station, communication base station and the application on military weapon by power supply especially.Lithium can be formed by the monomer lithium by power supply in electric core connection in series-parallel.The inner conductive impedance of the electric core of lithium energy has determined charge-discharge performance, cycle life and the fail safe of electric core.The bonding state of the structure of electricity core, manufacture method, pole piece barrier film contact interface all directly affects the inner conductive impedance of the electric core of lithium energy.Traditional electric core, manufacturing method of lithium energy: the one, the cylindrical electrical core or the square electric core of reeling, the 2nd, barrier film is the square electric core of folding Z font lamination continuously.The 3rd, the pole piece barrier film cuts moulding earlier, stacked more square electric core.The common feature of conventional method is the not constraint of contact-making surface of positive/negative plate and barrier film, and the contact internal resistance increase, the electrochemical polarization that cause thus increase the weight of all having a strong impact on battery performance, especially fail safe.The radius of curvature of pole piece changes in the conventional method, thermal contraction, the large-scale pole piece barrier film of barrier film are stacked continuously all is to cause the main cause and the main potential safety hazard of internal short-circuit of battery, polarization after film gauffer, bubble, damage problem.
For this reason, the present invention (1) with lithium can battery large-scale positive/negative plate, membrane for polymer, by the order of positive plate, membrane for polymer, negative plate, membrane for polymer, positive plate along barrier film uncoiling direction stacked (seeing accompanying drawing 1); (2) stacked pole piece barrier film is protected (seeing accompanying drawing 3) with the high-temperature resistance plastice film; (3) the stacked pole piece barrier film that the high-temperature resistance plastice film is protected is placed on following hard roll (or die) and the heating and flat lump together (the seeing accompanying drawing 4) of roll extrusion heat between the soft roll moving up and down of heating.It is very tight to make a pole piece and barrier film contact interface, and highly stable monolithic electricity core unit (seeing accompanying drawing 5).The present invention has overcome the mass defect that the traditional electrical core, manufacturing method causes.
Summary of the invention
The objective of the invention is the technical quality problems that electric core manufacturing exists at traditional lithium energy, the flat method of closing of the forward stacked super-low impedance heat of a kind of large-scale pole piece barrier film is proposed, it is characterized in that: lithium can comprise lithium energy battery positive/negative plate, membrane for polymer by battery battery core, and concrete preparation may further comprise the steps:
1) stacked by the order of positive plate, membrane for polymer, negative plate, membrane for polymer, positive plate along the uncoiling direction of barrier film coiled strip;
2) at an end of the close barrier film uncoiling of the stacked good pole piece barrier film assembly horizontal heat seal 5 ~ 30mm that goes ahead of the rest, negative plate 2 ~ 5mm severing will respectively be grown then before and after the barrier film;
3) the pole piece barrier film that localized heat is lumped together protects in the middle of being placed on two-layer high-temperature resistance plastice film;
4) the stacked pole piece barrier film that step 3) high-temperature resistance plastice film is protected is placed on down hard roll or template and goes up between soft roll or the template; hard roll is heated to 60 ~ 110 ℃ down; on last soft roll, heat simultaneously 60 ~ 110 ℃ and apply downforce 100-210Kg/ ㎡; depress soft roll; top and bottom rolls roll extrusion heat is flat closed for 0.1 ~ 5 second; positive/negative plate and barrier film contact interface are bonded together, make the stable monolithic electricity core unit of contact interface.
The fabric width of described barrier film coiled strip and pole piece size match.
Described hard roll roll surface hardness down is HRC50 ~ 65.
Described soft roll roll surface material is a heat-proof silica gel.
Described barrier film is three layers of composite membrane of two-layer PP therebetween PE.
Described positive/negative plate is square or the rectangle of length of side 300-1000mm.
The every limit of described negative plate size is greater than the every limit of positive plate size 1-3mm.
The invention has the beneficial effects as follows that the present invention adopts down the method for the heating of hard roll (or template) and last soft roll (or template), roll extrusion, stacked good large-scale positive/negative plate and barrier film are placed on hot flat the lumping together of roll extrusion between the soft or hard roll up and down, its positive/negative plate and barrier film contact interface are bonded together very closely, make the stable monolithic electricity core unit of contact interface.Low with the impedance of this monomer of making electricity core, have extended cycle life, safe in utilization.
Description of drawings
Fig. 1 is the stacked schematic diagram of positive plate, negative plate and the membrane for polymer of monolithic electricity core.
Fig. 2 is the monolithic electricity core schematic diagram of partial lateral heat seal end socket.
Fig. 3 is monolithic electricity core protection schematic diagram in the middle of the high-temperature resistance plastice film of partial lateral heat seal end socket.
Fig. 4 is the flat schematic diagram that closes of the top and bottom rolls roll extrusion heat of monolithic electricity core.
Monolithic electricity core schematic diagram after Fig. 5 closes for heat is flat.
Embodiment:
The invention provides hot the putting down of the forward stacked super-low impedance of a kind of large-scale pole piece barrier film and close method, being specifically related to lithium can have the preparation method of large-scale positive/negative plate and the electric core of the flat monolithic that closes of barrier film heat by battery.Above-mentioned lithium can comprise lithium energy battery positive/negative plate (size is according to the decision of lithium energy battery capacity), membrane for polymer (coiled strip fabric width and negative plate size match) by the large-scale pole piece barrier film of battery.The present invention is described in further detail by specific embodiment below in conjunction with accompanying drawing:
1) by the LiFePO 4 of positive plate 3(450mm * 450mm * 0.18mm), the thick inclined to one side polyvinyl fluoride of pvdf of three layers of composite membrane dip-coating 0.002mm of the two-layer PP therebetween PE of membrane for polymer 5(fabric width 456mm), the Delanium of negative plate 4(452mm * 452mm * 0.13mm), the order of membrane for polymer 5, positive plate 31 is the negative plate lug in the direction of the uncoiling of barrier film coiled strip 6 stacked (shown in arrow among Fig. 1) figure; 2 is the positive plate lug;
2) stacked good pole piece barrier film assembly near an end of barrier film uncoiling with the horizontal heat seal of going ahead of the rest of the wide horizontal end socket 7 of 10mm, then the barrier film front and back are respectively grown negative plate 2mm severing (as shown in Figure 2);
3) the pole piece barrier film that localized heat is lumped together is placed on high-temperature resistance plastice film 8 middle the protecting (as shown in Figure 3) behind the two-layer 0.3mm;
4) the stacked pole piece barrier film with 8 protections of step 3) high-temperature resistance plastice film is placed on down between hard roll (roll surface hardness HRC55) and the last soft roll (roll surface material heat-proof silica gel); hard roll roll surface is heated to 100 ℃ down; on last soft roll roll surface, heat simultaneously 90 ℃ and apply downforce 100Kg/ ㎡; depress soft roll; top and bottom rolls roll extrusion heat is flat closed for 0.2 second; positive/negative plate and membrane for polymer contact interface are bonded together (as shown in Figure 4), make the stable square monolithic electricity core unit (as shown in Figure 5) of contact interface.
1) stacked by the order of positive plate (LiFePO 4 of 400mm * 650mm * 0.2mm), membrane for polymer (the thick inclined to one side polyvinyl fluoride of pvdf of three layers of composite membrane dip-coating 0.002mm of the two-layer PP therebetween PE of fabric width 416mm), negative plate (Delanium of 402mm * 653mm * 0.15mm), membrane for polymer, positive plate along the direction of barrier film uncoiling;
2) stacked good pole piece barrier film near an end of barrier film uncoiling with the horizontal heat seal of going ahead of the rest of the wide horizontal end socket of 10mm, then the barrier film front and back are respectively grown negative plate 2mm severing;
3) the pole piece barrier film that localized heat is lumped together is placed on middle the protecting of high-temperature resistance plastice film behind the two-layer 0.3mm;
4) the stacked pole piece barrier film with the protection of step 3) high-temperature resistance plastice film is placed on down between hard roll (roll surface hardness HRC55) and the last soft roll (roll surface material heat-proof silica gel); hard roll roll surface is heated to 110 ℃ down; on last soft roll roll surface, heat simultaneously 95 ℃ and apply downforce 150Kg/ ㎡; depress soft roll; top and bottom rolls roll extrusion heat is flat closed for 0.5 second; positive/negative plate and membrane for polymer contact interface are bonded together, make the stable rectangular monolithic electricity core unit of contact interface.
1) stacked by the order of positive plate (LiFePO 4 of 350mm * 350mm * 0.18mm), membrane for polymer (the thick inclined to one side polyvinyl fluoride of pvdf of three layers of composite membrane dip-coating 0.002mm of the two-layer PP therebetween PE of fabric width 356mm), negative plate (Delanium of 352mm * 352mm * 0.15mm), membrane for polymer, positive plate along the direction of barrier film uncoiling;
2) stacked good pole piece barrier film near an end of barrier film uncoiling with the horizontal heat seal of going ahead of the rest of the wide horizontal end socket of 5mm, then the barrier film front and back are respectively grown negative plate 2mm severing;
3) the pole piece barrier film that localized heat is lumped together is placed on middle the protecting of high-temperature resistance plastice film behind the two-layer 0.3mm;
4) the stacked pole piece barrier film with the protection of step 3) high-temperature resistance plastice film is placed on down between hard roll (roll surface hardness HRC55) and the last soft roll (roll surface material heat-proof silica gel); hard roll roll surface is heated to 70 ℃ down; on last soft roll roll surface, heat simultaneously 85 ℃ and apply downforce 200Kg/ ㎡; depress soft roll; top and bottom rolls roll extrusion heat is flat closed for 2 seconds; positive/negative plate and membrane for polymer contact interface are bonded together, make the stable rectangular monolithic electricity core unit of contact interface.
The flat method of closing of above-mentioned heat is suitable for the following electric core of 300mm equally.
Claims (7)
1. the one kind large-scale forward stacked super-low impedance heat of pole piece barrier film is put down and closed method, it is characterized in that: lithium can comprise lithium energy battery positive/negative plate, membrane for polymer by battery battery core, and concrete preparation may further comprise the steps:
1) stacked by the order of positive plate, membrane for polymer, negative plate, membrane for polymer, positive plate along barrier film coiled strip uncoiling direction;
2) stacked good pole piece barrier film will respectively grow negative plate 2 ~ 5mm severing then at the horizontal heat seal 5 ~ 30mm that goes ahead of the rest near an end of barrier film uncoiling before and after the barrier film;
3) the pole piece barrier film that localized heat is lumped together protects in the middle of being placed on two-layer high-temperature resistance plastice film;
4) the stacked pole piece barrier film that step 3) high-temperature resistance plastice film is protected is placed on down hard roll or template and goes up between soft roll or the template; hard roll is heated to 60 ~ 110 ℃ down; on last soft roll, heat simultaneously 60 ~ 110 ℃ and apply downforce 100-210Kg/ ㎡; depress soft roll; top and bottom rolls roll extrusion heat is flat closed for 0.1 ~ 5 second; positive/negative plate and barrier film contact interface are bonded together, make the stable monolithic electricity core unit of contact interface.
2. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: the fabric width of described barrier film coiled strip and pole piece size match.
3. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: described hard roll roll surface hardness down is HRC50 ~ 65.
4. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: described soft roll roll surface material is a heat-proof silica gel.
5. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: described barrier film is three layers of composite membrane of two-layer PP therebetween PE.
6. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: described positive/negative plate is square or the rectangle of length of side 300-1000mm.
7. close method according to the forward stacked super-low impedance heat of the described large-scale pole piece barrier film of claim 1 is flat, it is characterized in that: the every limit of described negative plate size is greater than the every limit of positive plate size 1-3mm.
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| CN201110101238XA CN102185160B (en) | 2011-04-22 | 2011-04-22 | Extremely-low impedance heat flat sealing method for forward lamination of large plates and diaphragms |
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| CN201110101238XA CN102185160B (en) | 2011-04-22 | 2011-04-22 | Extremely-low impedance heat flat sealing method for forward lamination of large plates and diaphragms |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636882A (en) * | 2015-09-07 | 2018-01-26 | 松下知识产权经营株式会社 | Rechargeable nonaqueous electrolytic battery |
| CN110459813A (en) * | 2019-07-02 | 2019-11-15 | 萨姆蒂萨（天津）数据信息技术有限公司 | A kind of preparation method of lithium battery |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315993A (en) * | 2007-05-28 | 2008-12-03 | 东莞新能源电子科技有限公司 | Method for manufacturing stack type lithium ion battery |
| CN101621133A (en) * | 2008-07-05 | 2010-01-06 | 东莞新能源科技有限公司 | Secondary lithium ion battery and preparation method thereof |
-
2011
- 2011-04-22 CN CN201110101238XA patent/CN102185160B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315993A (en) * | 2007-05-28 | 2008-12-03 | 东莞新能源电子科技有限公司 | Method for manufacturing stack type lithium ion battery |
| CN101621133A (en) * | 2008-07-05 | 2010-01-06 | 东莞新能源科技有限公司 | Secondary lithium ion battery and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636882A (en) * | 2015-09-07 | 2018-01-26 | 松下知识产权经营株式会社 | Rechargeable nonaqueous electrolytic battery |
| CN107636882B (en) * | 2015-09-07 | 2020-04-03 | 松下知识产权经营株式会社 | Nonaqueous electrolyte secondary battery |
| CN110459813A (en) * | 2019-07-02 | 2019-11-15 | 萨姆蒂萨（天津）数据信息技术有限公司 | A kind of preparation method of lithium battery |
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Effective date of registration: 20160113 Address after: 253400, No. 4 small business pioneer park, Lunan Road, Ningjin, Dezhou, Shandong, Taishan Patentee after: DEZHOU XINCHUANG LITHIUM BATTERY CO., LTD. Address before: 102200 No. 11 Huatong Road, Changping science and Technology Park, Beijing, Changping District Patentee before: Beijing Hengxianglineng Power Supply Technology Co., Ltd. |
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Addressee: Beijing Hengxianglineng Power Supply Technology Co., Ltd. Document name: Notification that Application Deemed not to be Proposed |
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Granted publication date: 20130417 Termination date: 20190422 |