CN101656330A - Method for making lithium-ion battery cells - Google Patents

Method for making lithium-ion battery cells Download PDF

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Publication number
CN101656330A
CN101656330A CN200910183502A CN200910183502A CN101656330A CN 101656330 A CN101656330 A CN 101656330A CN 200910183502 A CN200910183502 A CN 200910183502A CN 200910183502 A CN200910183502 A CN 200910183502A CN 101656330 A CN101656330 A CN 101656330A
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negative
plate
positive
lug
plates
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CN200910183502A
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Inventor
孙全
佘沛亮
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Shuangdeng Science & Technology Development Academy Co Ltd Nanjing City
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Shuangdeng Science & Technology Development Academy Co Ltd Nanjing City
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Priority to CN200910183502A priority Critical patent/CN101656330A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a method for making lithium-ion battery cells. The method comprises the following steps: coating active substances on a positive current collector, and punching the positive current collector into single positive plates with lugs; coating active substances on a negative current collector, and rolling and punching the negative current collector with a plurality of lugs to form long negative plates; folding the long negative plates in a Z shape according to the sizes of rated single negative plates to ensure that the adjacent single negative plates with rated sizes are overlapped with each other; coating the positive plates with membranes and inserting the positive plates between every two adjacent negative plates to form cells, or coating the the negative current collector with the membranes before being folded, and then directly inserting the folded positive plates between every two adjacent negative plates to form the cells. The method integrates the advantagesof good coiling technology, high efficiency, good high-power discharge of overlaid plates and the like, and is especially suitable for making high-capacity power lithium-ion battery cells.

Description

A kind of method for making lithium-ion battery cells
Technical field
The invention belongs to technical field of chemical power, be specifically related to a kind of method for making lithium-ion battery cells.
Background technology
The making of lithium ion battery cell mainly contain soft around with the lamination dual mode.Takeup type electricity core is that the both positive and negative polarity pole piece is made strip, and the lug of burn-oning is wrapped barrier film, is rolled into electric core.Winding process efficient height, high conformity.But because the coiling battery pole piece is long, and confluxes by single lug, the distance of electron transfer causes the internal resistance of battery higher, and high-rate discharge ability is relatively poor.So winding process only is fit to do low capacity, low battery power.
Lamination technology is that the both positive and negative polarity pole piece is made sheet, adopts craft or lamination machine with the folded sign indicating number of both positive and negative polarity together, the anodal a slice negative pole of a slice, and the centre separates with barrier film.What the current driving force battery was made main employing is lamination technology, and this is because every pole piece all leaves lug, the current density height of electrode, and suitable high-multiplying power discharge, and can make jumbo battery, capacity can reach ampere-hours up to a hundred.But the lamination process efficiency is low, because at present equipment level is limited, causes the burr that the both positive and negative polarity corner produces in the film-making process more, make electric core after, the corner burr punctures barrier film, causes internal resistance of cell micro-short circuit, the rate of finished products of battery is low, the cost of manufacture height.
Occurred the mode that lamination is reeled at present, relate separately to a kind of manufacture method and a kind of lamination coiled lithium ion battery electricity core of lithium-ion electric core as Chinese patent 200710034993.4 and Chinese patent 200820083400.3, adopting multi-disc positive pole and multi-disc negative pole to be reeled by barrier film separate layer poststack forms, this method can't realize the big production of automation, manual finishing can only be arranged, and the consistency of battery is relatively poor.Chinese patent 200510015494.1 then relates to a kind of folding lithium ion battery polar group and preparation method thereof, and electric core adopts a plurality of positive poles and a slice negative pole, and both positive and negative polarity is respectively drawn a lug by welding manner, and the internal resistance of electric core is higher.
Summary of the invention
The objective of the invention is to overcome existing the coiling and lamination technology shortcoming, a kind of method for making lithium-ion battery cells is provided, this method has concentrated that winding process is good, efficient is high and advantage such as the lamination high-rate discharge ability is good, is particularly useful for the making of large-capacity power type lithium ion electricity core.
Purpose of the present invention can reach by following measure:
A kind of method for making lithium-ion battery cells comprises the steps:
(A) plus plate current-collecting body applies roll-in behind the active material, is die-cut into the positive plate of monolithic band lug;
(B) roll-in behind the negative current collector coating active material punches out a plurality of lugs at interval in the non-applying area that links to each other with the negative current collector applying area, forms the long pole plate of negative pole;
(C) it is folding the long pole plate of negative pole to be zigzag by specified single negative plate size, makes the single negative plate mutual superposition of adjacent norminal size, and wherein each negative plate all has the lug overlaid of lug and adjacent cathode sheet;
(D) positive plate is wrapped insert behind the barrier film and formed electric core between per two adjacent negative plates, perhaps negative current collector is wrapped barrier film earlier before folding, positive plate is directly inserted the electric core of composition between per two adjacent negative plates after folding again; This dual mode can either be realized by manual operations, also can adopt automation equipment to realize simultaneously.The lug overlaid of a plurality of positive plates wherein.
The plus plate current-collecting body that applied active material can be die-cut into " kitchen knife " shape pole piece, and " handle of a knife " is equivalent to the positive plate lug, and " handle of a knife " also can be positioned at the centre position of " kitchen knife ".The negative current collector that applied active material punches out the long pole plate of negative pole that a plurality of lugs form in non-applying area, and its length is required to be the integral multiple of specified single negative plate length or width, is beneficial to Z-shaped folding.
The lug of the positive plate of the electric core of making can be unified in the homonymy of negative plate lug, perhaps also can be unified in an opposite side; The lug of positive plate or negative plate needs each other can be overlapping, and the multilayer lug is mediated back soldering polar ear or terminal.
The undersized of anode pole piece is in the folding back of negative pole zigzag individual layer size (being specified single negative plate size), and the length of preferred single positive plate and width are all than the little 0.4~4mm of specified single negative plate (not comprising lug).After positive plate inserted between the adjacent cathode sheet, only lug partly exposed between the two adjacent negative plates, promptly requires positive plate not expose negative plate, and cathode pole piece wraps up positive plate fully.
Positive plate and negative plate are formed and are wrapped with high temperature gummed tape behind the electric core and fix.
Compare with existing method, the present invention mainly contains following characteristics:
1, electric core only adopts a slice negative plates, leaves a plurality of lugs on the pole plate.
The present invention adopts the long pole plate of a slice negative pole, has avoided lamination technology negative pole to adopt many pole pieces, and the corner burr pierces through barrier film, and electric in-core portion micro-short circuit causes electric core to scrap situation.Leave a plurality of lugs on the pole plate, lug does not need to connect contactless internal resistance by the mode of welding; The multipole ear of negative pole designs, and has shortened the distance of the migration of electronics, and pole plate can be fit to the battery of power type with than high current density discharge very much.And on the winding process negative lug welding pole piece, the quantity of lug only is one, adds that the contact internal resistance of welding is big, causes the internal resistance of battery higher.
2, folding by the long pole plate Z of negative pole font, make the multipole ear of negative pole overlap in folding back.
The long pole plate Z of negative pole font is folding, the consistent size of each lamination, and the multipole ear of the long pole plate of negative pole could overlap like this.If adopt the mode of reeling, the location of cathode pole piece lug is difficulty very, because the length that every volume one encloses required pole piece all can increase, behind the coiling, the lug of electric core often can not overlap, and the lug welding of back segment operation can't be implemented.
3, the size of anode pole piece all folds back individual layer size (being specified single negative plate size) little 0.4~4mm (not comprising lug) than negative pole zigzag at height and Width.
Method for making lithium-ion battery cells of the present invention has concentrated that winding process is good, efficient is high and advantage such as the lamination high-rate discharge ability is good, is particularly useful for the making of large-capacity power type lithium ion electricity core.
Description of drawings
Fig. 1 is the present invention's electricity core anode pole piece schematic diagram;
Fig. 2 is the present invention's electricity core negative plates schematic diagram;
Fig. 3 is the folding schematic diagram of the positive and negative lug homonymy of the present invention's electricity core Z font;
Fig. 4 is the folding schematic diagram of the positive and negative lug contraposition of the present invention's electricity core Z font.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings electric core manufacture method of the present invention is described further.
Embodiment 1:
With the 10Ah lithium manganate battery is example
1, the both positive and negative polarity collector is respectively 22 μ m aluminium foils and 12 μ m aluminium foils.The surface density that applies is respectively 42g/cm 2And 15g/cm 2The composition and the content of anode and cathode slurry see the following form:
Figure G2009101835021D00041
After the both positive and negative polarity collector applies active material, through roll-in, punching molding.Positive pole is die-cut into the shape of the anode pole piece 1 among Fig. 1, and wherein 1 is positive pole ear, the non-applying area in the position of lug, and uncoated active material, 3 is the anode pole piece applying area.The long pole plate of negative pole is die-cut into the shape of negative plates 1 among Fig. 2,2 negative lug wherein, and long pole piece is provided with a plurality of lugs, and 4 is the negative pole applying area.
2, the position of Fig. 2 dotted line is the folding position of negative pole Z font, each folding consistent size.The size of anode pole piece all folds the little 0.5mm of back individual layer size than negative pole zigzag at height and Width.After positive pole is wrapped barrier film, insert the negative pole after the Z font folds, positive pole ear is positioned at the homonymy of negative lug.As Fig. 3, all negative lug 6 and whole positive pole ears 5 compress the back at electric core and all overlap.
3, the 10Ah lithium manganate battery of making by above method, its internal resistance is 2.5~3.0m Ω, 5 multiplying power dischargings can be emitted more than 85% of rated capacity; And electric in-core resistance 3.5~4.0m Ω of coiling form, 5 multiplying power dischargings can only be emitted 60% of rated capacity.The more existing lamination mode of this production program wants simple many in negative pole film-making operation, and the battery short circuit probability will reduce greatly.
Embodiment 2:
With the 8Ah high power lithium iron phosphate cell is example
1, the both positive and negative polarity collector is respectively 22 μ m aluminium foils and 12 μ m aluminium foils.The surface density that applies is respectively 21g/cm 2And 10g/cm 2The composition and the content of anode and cathode slurry see the following form:
After the both positive and negative polarity collector applies active material, through roll-in, punching molding.Positive pole is die-cut into the shape of Fig. 1 anode pole piece 2, and lug is positioned at the centre position of pole piece one side.The long pole plate of negative pole is die-cut into Fig. 2 negative plates 2 shapes, and the long pole plate of negative pole is provided with a plurality of lugs, and lug is positioned at the centre position of each lamination.
2, the position of Fig. 2 dotted line is the folding position of negative pole Z font, each folding consistent size.The size of anode pole piece all folds the little 2mm of back individual layer size than negative pole zigzag at height and Width.After negative pole was wrapped barrier film, the Z font was folding, positive pole was being inserted wherein the contraposition of both positive and negative polarity lug.As Fig. 4, all negative lug and whole positive pole ears compress the back at electric core and all overlap.
3, the 8Ah high power lithium iron phosphate cell of making by above method, its internal resistance is below the 2.0m Ω, 30 multiplying power dischargings can be emitted more than 90% of rated capacity; And electric in-core resistance 2.5~3.0m Ω of coiling form, 30 multiplying power dischargings can only be emitted 70% of rated capacity.The more existing lamination mode of this production program wants simple many in negative pole film-making operation, and the battery short circuit probability will reduce greatly.

Claims (5)

1, a kind of method for making lithium-ion battery cells is characterized in that comprising the steps:
(A) plus plate current-collecting body applies roll-in behind the active material, is die-cut into the positive plate of monolithic band lug;
(B) roll-in behind the negative current collector coating active material punches out a plurality of lugs at interval in the non-applying area that links to each other with the negative current collector applying area, forms the long pole plate of negative pole;
(C) it is folding the long pole plate of negative pole to be zigzag by specified single negative plate size, makes the single negative plate mutual superposition of adjacent norminal size, and wherein each negative plate all has the lug overlaid of lug and adjacent cathode sheet;
(D) positive plate is wrapped insert behind the barrier film and formed electric core between per two adjacent negative plates, perhaps negative current collector is wrapped barrier film earlier before folding, positive plate is directly inserted the electric core of composition between per two adjacent negative plates after folding again; The lug overlaid of a plurality of positive plates wherein.
2, method according to claim 1 is characterized in that the homonymy of the lug of positive plate at the negative plate lug, a perhaps opposite side.
3, method according to claim 1 is characterized in that the length of single positive plate and width are all than the little 0.4~4mm of specified single negative plate.
4, according to claim 1 or 3 described methods, it is characterized in that positive plate inserts between the adjacent cathode sheet after, only lug partly exposes between the two adjacent negative plates.
5, method according to claim 1 is characterized in that positive plate and negative plate are formed to be wrapped with high temperature gummed tape behind the electric core and to fix.
CN200910183502A 2009-09-22 2009-09-22 Method for making lithium-ion battery cells Pending CN101656330A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102024980A (en) * 2010-10-14 2011-04-20 惠州亿纬锂能股份有限公司 Battery cell coiling device
CN102208604A (en) * 2010-03-30 2011-10-05 江苏伊思达电池有限公司 Preparation method of electrode sheet without external tab of coiled lithium ion battery
CN102779968A (en) * 2012-04-01 2012-11-14 深圳市民众能源科技有限公司 Modular battery
CN103050736A (en) * 2011-10-14 2013-04-17 深圳市海盈科技有限公司 Assembly method of lithium ion battery
CN103682460A (en) * 2013-12-19 2014-03-26 深圳市吉阳自动化科技有限公司 Stacking machine and stacking method thereof
WO2014201609A1 (en) * 2013-06-17 2014-12-24 中国科学院物理研究所 Electrode assembly, manufacturing method therefor, and lithium secondary battery
CN104900905A (en) * 2015-06-03 2015-09-09 深圳市迪凯特电池科技有限公司 Laminated lithium ion battery and production process thereof
CN105371758A (en) * 2014-08-19 2016-03-02 有量科技股份有限公司 Electric core detection method
CN105633451A (en) * 2015-12-29 2016-06-01 深圳市优特利电源有限公司 Ultra-thin polymer battery and fabrication method thereof
CN105895966A (en) * 2016-06-13 2016-08-24 合肥国轩高科动力能源有限公司 Preparation method of laminated wound lithium-ion battery roll core
CN105932338A (en) * 2016-06-13 2016-09-07 合肥国轩高科动力能源有限公司 Fast preparation method of laminated lithium-ion roll core
CN106531952A (en) * 2016-12-19 2017-03-22 东莞市科睿思美新能源科技有限公司 Pole piece with tabs
CN109599589A (en) * 2018-12-12 2019-04-09 河北银隆新能源有限公司 Battery core method for making and battery
CN110071331A (en) * 2019-04-25 2019-07-30 四川福来威新能源科技有限公司 A kind of lithium battery and preparation method thereof
CN110571472A (en) * 2019-08-21 2019-12-13 温州大学新材料与产业技术研究院 electrode core body of flexible battery and preparation method and application thereof
CN110970680A (en) * 2018-09-28 2020-04-07 有量科技股份有限公司 Method for disassembling battery core
CN111952679A (en) * 2020-08-06 2020-11-17 郜明文 Battery cell preparation process based on dry film forming
CN112563555A (en) * 2020-12-24 2021-03-26 常德中科多源电力融合技术研究院 Battery winding needle and large-capacity square metal shell lithium ion battery
CN113823825A (en) * 2021-08-29 2021-12-21 西北工业大学 Battery cell, manufacturing method thereof, arc-shaped battery and battery module
CN115312988A (en) * 2022-09-08 2022-11-08 珠海冠宇电池股份有限公司 Multi-tab pole piece, multi-tab battery cell and battery

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102208604A (en) * 2010-03-30 2011-10-05 江苏伊思达电池有限公司 Preparation method of electrode sheet without external tab of coiled lithium ion battery
CN102024980A (en) * 2010-10-14 2011-04-20 惠州亿纬锂能股份有限公司 Battery cell coiling device
CN102024980B (en) * 2010-10-14 2013-09-18 惠州亿纬锂能股份有限公司 Battery cell coiling device
CN103050736A (en) * 2011-10-14 2013-04-17 深圳市海盈科技有限公司 Assembly method of lithium ion battery
CN102779968A (en) * 2012-04-01 2012-11-14 深圳市民众能源科技有限公司 Modular battery
CN102779968B (en) * 2012-04-01 2015-05-20 深圳市民众能源科技有限公司 Modular battery
WO2014201609A1 (en) * 2013-06-17 2014-12-24 中国科学院物理研究所 Electrode assembly, manufacturing method therefor, and lithium secondary battery
CN103682460A (en) * 2013-12-19 2014-03-26 深圳市吉阳自动化科技有限公司 Stacking machine and stacking method thereof
CN105371758A (en) * 2014-08-19 2016-03-02 有量科技股份有限公司 Electric core detection method
CN104900905A (en) * 2015-06-03 2015-09-09 深圳市迪凯特电池科技有限公司 Laminated lithium ion battery and production process thereof
CN105633451A (en) * 2015-12-29 2016-06-01 深圳市优特利电源有限公司 Ultra-thin polymer battery and fabrication method thereof
CN105633451B (en) * 2015-12-29 2018-06-05 深圳市优特利电源有限公司 Ultrathin polymer battery and production method
CN105932338A (en) * 2016-06-13 2016-09-07 合肥国轩高科动力能源有限公司 Fast preparation method of laminated lithium-ion roll core
CN105895966A (en) * 2016-06-13 2016-08-24 合肥国轩高科动力能源有限公司 Preparation method of laminated wound lithium-ion battery roll core
CN106531952A (en) * 2016-12-19 2017-03-22 东莞市科睿思美新能源科技有限公司 Pole piece with tabs
CN110970680A (en) * 2018-09-28 2020-04-07 有量科技股份有限公司 Method for disassembling battery core
CN109599589A (en) * 2018-12-12 2019-04-09 河北银隆新能源有限公司 Battery core method for making and battery
CN110071331A (en) * 2019-04-25 2019-07-30 四川福来威新能源科技有限公司 A kind of lithium battery and preparation method thereof
CN110571472A (en) * 2019-08-21 2019-12-13 温州大学新材料与产业技术研究院 electrode core body of flexible battery and preparation method and application thereof
CN111952679A (en) * 2020-08-06 2020-11-17 郜明文 Battery cell preparation process based on dry film forming
CN111952679B (en) * 2020-08-06 2022-02-25 郜明文 Battery cell preparation process based on dry film forming
CN112563555A (en) * 2020-12-24 2021-03-26 常德中科多源电力融合技术研究院 Battery winding needle and large-capacity square metal shell lithium ion battery
CN113823825A (en) * 2021-08-29 2021-12-21 西北工业大学 Battery cell, manufacturing method thereof, arc-shaped battery and battery module
CN115312988A (en) * 2022-09-08 2022-11-08 珠海冠宇电池股份有限公司 Multi-tab pole piece, multi-tab battery cell and battery
CN115312988B (en) * 2022-09-08 2023-06-06 珠海冠宇电池股份有限公司 Multipolar ear pole piece, multipolar ear cell and battery

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