CN105914389A - Laser precision welding method for edge sealing of soft-package aluminum shell battery cell - Google Patents

Laser precision welding method for edge sealing of soft-package aluminum shell battery cell Download PDF

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Publication number
CN105914389A
CN105914389A CN201610442921.2A CN201610442921A CN105914389A CN 105914389 A CN105914389 A CN 105914389A CN 201610442921 A CN201610442921 A CN 201610442921A CN 105914389 A CN105914389 A CN 105914389A
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layer
laser
aluminum
nylon
edge sealing
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CN201610442921.2A
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CN105914389B (en
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于艳玲
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Wenzhou Vocational and Technical College
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Wenzhou Vocational and Technical College
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/04Construction or manufacture in general
    • H01M10/0404Machines for assembling batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183Sealing members
    • 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 provides a laser precision welding method for edge sealing of a soft-package aluminum shell battery cell. The method comprises the steps as follows: two to-be-sealed and welded battery cell soft-package aluminum-plastic composite membranes are placed in a manner that PP inner layers are oppositely laminated according to an edge sealing and welding position; a transparent glass layer is added to an upper nylon layer; the gap between the upper nylon layer and the transparent glass layer is filled with a thin-layer cooling liquid to isolate the transparent glass layer from the upper nylon layer; pressure is exerted, so that various layers are in tight contact; a laser beam is utilized to enter from the upper part of the transparent glass layer and is focused on the surface of an upper aluminum layer, so that an upper PP layer and a lower PP layer are melted; irradiation is stopped or the laser beam is moved away; and the melted upper PP layer and lower PP layer are quickly cooled and condensed to achieve firm and tight edge sealing. By laser absorption, fast heating and heat conduction of aluminum foil middle layers, the process effect that the PP layers are melted while nylon outer layers are not melted is achieved; and laser precision welding of the PP inner layers of the upper and lower aluminum-plastic composite membranes is achieved under the added pressure-assisted action. The laser precision welding method has the advantages of small edge sealing width, good sealing quality, high production efficiency and the like.

Description

A kind of laser accurate welding method of Soft Roll aluminum hull battery core edge sealing
Technical field
The invention belongs to laser precision machining field, be specifically related to swashing of a kind of Soft Roll aluminum hull battery core edge sealing Light fine welding method.
Background technology
At present, lithium ion battery applications is more and more extensive, can be roughly divided into packaging shell for standard Three classes, with stainless 18650 cylindrical batteries of column, with the square battery of aluminum hull and stainless steel case with And with the soft-package battery of aluminum plastic film.The lithium battery of plastic-aluminum flexible packing is different from the metal of conventional liquid battery core Shell, once occurs potential safety hazard, conventional liquid battery core easily to explode, and polymer battery core is the most only Can be enraged, any harmful person and the problem of property safety will not be produced.Reason is the plastic-aluminum of Soft Roll Relatively large cushion space can be provided the when of the situations such as film has certain ductility, flatulence, so Will not be the most quick-fried.Secondly, when gas is on the increase, aluminum plastic film stress stretches, gluing between PP Conjunction may be opened tear, will easily explosion threshold values to before first release gas, thus anti- Stop blast.Furthermore, when the gas of soft pack cell increases, the positive/negative plate being easily caused inside separates Open very much so that reaction is slow, even stops, thus prevents blast.Benefit from domestic mobile phone, pen Remembering the quick growth to lithium battery demand such as this computer, mobile terminal product, digital camera, plastic-aluminum is multiple The market closing film goes from strength to strength.
The presently commercially available plastic-aluminum combined membrane structure of battery core Soft Roll is: internal layer polyolefin (PP) base material, in Interbed aluminium foil and outer layer nylon film, i.e. PP layer+aluminium lamination+nylon layer, passes through cementability between every layer Auxiliary agent is combined.Top layer nylon layer is decorative layers, also plays the effect that protection aluminium lamination is not scraped off;Middle For form molding with prevent the aluminium lamination that moisture invades;Internal layer PP resin bed is electrolyte resistance layer.From outward Seeing in sight, that bright face is aluminium lamination, is bag battery core, is nexine, and that face of obfuscation is nylon layer, It it is top layer.Battery core Soft Roll aluminum-plastic composite membrane technical specification includes: outward appearance, thickness, barrier, cold punching Molded property, heat seal strength, water soak resistance energy, electrical insulating property, inner membrance puncture-resistant performance, resistance to electrolysis Liquid stability, electrical property etc..
Soft Roll aluminum hull battery core needs to seal Soft Roll aluminum-plastic composite membrane in the course of processing, and current one As be all to use thermocompression bonding connection, i.e. use and be heated to the blade type pressure head of specified temp and press edge sealing up and down Position, makes the PP internal layer of two-layer aluminum-plastic composite membrane occur fusing to be bonded together by conduction of heat. But existing sealing machine is in Soft Roll capping processes, Soft Roll sealing part is easily made to occur that bubble causes Soft Roll sealing declines affects soft package lithium battery service life;Secondly, existing sealing machine seals at Soft Roll During Kou, easily there are burr in Soft Roll sealing part, affect soft package lithium battery attractive in appearance while also can shadow Ring the bonding of Soft Roll sealing part thus affect its sealing;Furthermore, thermocompression bonding connection relies on and slowly heats up Boosting heat seal, manufacturing process is longer, and due to long-time high-temperature baking effect, makes aluminium lamination brittle, Thus cause sealing property to deteriorate.Finally, existing sealing machine be limited to blade type indenter size and on The edge sealing Welding Problems stated, general edge sealing width design must be bigger, in equal area soft pack cell situation Under accounted for the internal capacity of a part of Soft Roll aluminum hull battery core, cause capacitance loss.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, it is provided that one has edge sealing narrow width, sealing The laser accurate welding method of the Soft Roll aluminum hull battery core edge sealing that quality is good, production efficiency is high.
The present invention is achieved through the following technical solutions:
The laser accurate welding method of a kind of Soft Roll aluminum hull battery core edge sealing, comprises the steps:
(1) will treat that two battery core Soft Roll aluminum-plastic composite membranes that edge sealing welds, according to edge sealing welding position, make PP internal layer is fitted placement relatively, be followed successively by the most from the bottom to top lower nylon layer, lower aluminum layer, lower PP layer, Upper PP layer, upper aluminum layer and upper nylon layer;The thickness wherein descending nylon layer and upper nylon layer is 10~100 The thickness of μm, lower aluminum layer and upper aluminum layer is 10~100 μm, lower PP layer and the thickness of upper PP layer It is 20~150 μm;
Described nylon layer is more than 80% to laser beam transmission rate used in later step (4);
(2) on upper nylon layer, a transparent glass layer is set up, and at upper nylon layer and transparent glass layer Between fill a thin layer cooling liquid, make both isolate;
Described transparent glass layer refers to laser beam transparent used in later step (4), i.e. absorbance More than 90%;Described thin layer cooling liquid also requires that laser beam used in later step (4) saturating Bright, i.e. absorbance is more than 90%;
(3) applying pressure and make the contact of upper and lower battery core Soft Roll aluminum-plastic composite membrane closely, contact stress is more than 1N/cm2
(4) use laser beam incident from the top of transparent glass layer, laser beam transparent transparent glass layer, Thin layer cooling liquid and upper nylon layer, focus on the surface of upper aluminum layer, and upper aluminum layer absorbs laser, and heat passes It is directed at PP layer and lower PP layer, makes PP layer and the fusing of lower PP layer;
(5) stop irradiating or removing laser beam, the upper PP layer of fusing and the lower rapid cooling solidification of PP layer Realize secure rigid edge sealing;
(6) repeat step (4)-(5), make the scanning of laser beam continuous moving can realize continuous path weldering Connect.
Further, step (4) also includes: use another laser beam simultaneously under lower nylon layer Side is incident, nylon layer under laser beam transparent, focuses on the surface of lower aluminum layer, and lower aluminum layer absorbs laser, Conduction of heat, to lower PP layer and upper PP layer, makes lower PP layer and the fusing of upper PP layer;Carry out the most simultaneously Laser Welding.
There is advantages that
1, having not yet to see the report utilizing laser welding to carry out aluminum-plastic composite membrane edge sealing, the present invention adopts With the nylon outer layer of laser transmission top aluminum-plastic composite membrane, act directly on aluminium foil interlayer so that Aluminium foil absorbs laser energy and is rapidly heated, and conduction of heat is to PP internal layer and the bottom plastic-aluminum fitted therewith The PP internal layer of composite membrane, makes the PP internal layer rapid melting of top and the bottom aluminum-plastic composite membrane, simultaneously additional Under pressure effect, it is achieved the firm welding of top and the bottom aluminum-plastic composite membrane PP internal layer.The ingenious utilization of the present invention The physical characteristics of materials of aluminum-plastic composite membrane, nylon outer layer is to common infrared, the laser of visible light wave range The preferable transmissison characteristic (general absorbance is more than 80%) of bundle, and the fusing point (that nylon outer layer is higher As more than 350 degree) fusing point (generally below 200 degree) the deviation feature relatively low with PP internal layer, utilize The absorption laser of aluminium foil interlayer, it is rapidly heated and conduction of heat, it is achieved the fusing of PP layer and nylon outer layer are not The technological effect of fusing, is aided with under impressed pressure effect, it is achieved that top and the bottom aluminum-plastic composite membrane PP internal layer Laser accurate welding.
2, comparing traditional thermocompression bonding connection, the laser accurate welding method heating of the present invention is very quick, Welding efficiency is high, and avoids the technology that the long-time high-temperature baking of conventional thermal pressure welding makes aluminium lamination brittle and ask Topic.
3, the isolation of the ingenious uniform pressure effect that make use of glass plate of the present invention and cooling liquid with Thermolysis, prevents nylon layer self slight absorption laser and is caused heating up by aluminium foil thermal too high Incident adhesion, burn-off phenomenon, and glass sheet press be uniform, it is to avoid sealing produce burr, The problem of bubble, the method is applicable to the laser accurate welding with similar multilayer film combined material, Relevance grade is the widest.
4, the sealing edge quality welded due to the laser accurate of the present invention is high, so that edge sealing width It is greatly reduced, in the case of same size soft pack cell, saves edge sealing area thus promote battery core area (i.e. battery core capacity), and regulate edge sealing width and need not change blade type hot pressing as conventional thermal pressure welding Head, edge sealing width is determined by laser beam spot diameter, easy to adjust, low cost.
5, comparing traditional thermoae plate pressure welding, laser welding measure of precision is high, and production efficiency is high, automatically Change degree is higher.
Accompanying drawing explanation
Fig. 1 is the Welding Structure figure of Soft Roll aluminum hull battery core edge sealing of the present invention.
Detailed description of the invention
The present invention will be further described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
The invention provides the laser accurate welding method of a kind of Soft Roll aluminum hull battery core edge sealing, including as follows Step:
(1) as it is shown in figure 1, on workbench 10, two the battery core Soft Roll aluminum that will treat that edge sealing welds Mould composite membrane according to edge sealing welding position, make PP internal layer relatively fit placement, be followed successively by the most from the bottom to top Lower nylon layer 1, lower aluminum layer 2, lower PP layer 3, upper PP layer 4, upper aluminum layer 5 and upper nylon layer 6; The thickness wherein descending nylon layer 1 and upper nylon layer 6 is 10~100 μm, lower aluminum layer 2 and upper aluminum layer 5 Thickness be 10~100 μm, the thickness of lower PP layer 3 and upper PP layer 4 is 20~150 μm.
Described battery core Soft Roll aluminum-plastic composite membrane is finished product, including internal layer polyolefin (PP) base material, centre Layer aluminium foil and outer layer nylon film, i.e. PP layer+aluminium lamination+nylon layer, helped by cementability between every layer Agent is combined.
Described lower nylon layer 1 and upper nylon layer 6 are to laser beam transmission rate used in later step (4) More than 80%.
(2) on upper nylon layer 6, a transparent glass layer 7 is set up, and at upper nylon layer 6 with transparent Fill a thin layer cooling liquid 8 (such as water) between glassy layer 7, make both isolate;
Described transparent glass layer 7 refers to laser beam transparent used in later step (4), i.e. transmission Rate is more than 90%;Described thin layer cooling liquid 8 also requires that laser used in later step (4) Restraint transparent, i.e. absorbance is more than 90%.
This setup takes full advantage of the uniform pressure effect of transparent glass layer 7 and thin layer is cold But the isolation of liquid 8 and thermolysis, be possible to prevent in post laser irradiation process nylon layer 6 Self slight absorption laser and caused heat up too high incident adhesion, mistake by upper aluminum layer 5 conduction of heat Burn phenomenon;And transparent glass layer 7 pressure is uniform, sealing can be avoided to produce burr, the asking of bubble Topic.
(3) applying pressure and make upper and lower two battery core Soft Roll aluminum-plastic composite membranes contact closely, contact stress is big In 1N/cm2
(4) use laser beam 9 incident from the top of transparent glass layer 7, laser beam transparent clear glass Layer 7, thin layer cooling liquid 8 and upper nylon layer 6, focus on the surface of upper aluminum layer 5, and upper aluminum layer 5 is inhaled Receive laser, conduction of heat supreme PP layer 4 and lower PP layer 3, make PP layer 4 and lower PP layer 3 melt (temperature is more than 185 degree);
(5) stopping irradiating or removing laser beam 9, upper PP layer 4 and the lower PP layer 3 of fusing drop rapidly Temperature solidification realizes secure rigid edge sealing;When using thermoae plate press welding method in prior art, edge sealing width is about It is 3 ± 0.2mm, and in the present invention, laser accurate edge sealing can realize width between 0.2mm~1mm.
(6) repeat step (4)-(5), make the scanning of laser beam continuous moving can realize continuous path weldering Connect.
Preferably, laser accurate welding method of the present invention can also be in the lower section of lower nylon layer 1 Increase a laser beam, the laser welding while of up and down.I.e. step (4) also includes: use another to swash Light beam 9 is simultaneously incident from the lower section of lower nylon layer 1, and laser beam 9, through lower nylon layer 1, focuses on down The surface of aluminium lamination 2, lower aluminum layer 2 absorbs laser, conduction of heat to lower PP layer 3 and upper PP layer 4, makes Lower PP layer 3 and upper PP layer 4 melt.This mode the most simultaneously carrying out Laser Welding, can be notable Accelerate the speed of Soft Roll aluminum hull battery core edge sealing, improve work efficiency.
It is apparent to one skilled in the art that the present invention can change into various ways, such Change and be not regarded as a departure from the scope of the present invention.All such technical staff to described field are aobvious and easy The amendment seen, is included within the scope of present claims.

Claims (2)

1. the laser accurate welding method of a Soft Roll aluminum hull battery core edge sealing, it is characterised in that include as Lower step:
(1) will treat that two battery core Soft Roll aluminum-plastic composite membranes that edge sealing welds, according to edge sealing welding position, make PP internal layer is fitted placement relatively, be followed successively by the most from the bottom to top lower nylon layer (1), lower aluminum layer (2), under PP layer (3), upper PP layer (4), upper aluminum layer (5) and upper nylon layer (6);Wherein descend nylon layer (1) It is 10~100 μm, lower aluminum layer (2) and the thickness of upper aluminum layer (5) with the thickness of upper nylon layer (6) Degree is 10~100 μm, and the thickness of lower PP layer (3) and upper PP layer (4) is 20~150 μm;
Described lower nylon layer (1) and upper nylon layer (6) are to laser beam used in later step (4) Absorbance is more than 80%;
(2) on upper nylon layer (6), a transparent glass layer (7) is set up, and in upper nylon layer (6) And fill a thin layer cooling liquid (8) between transparent glass layer (7), make both isolate;
Described transparent glass layer (7) refers to laser beam transparent used in later step (4), i.e. Absorbance is more than 90%;Described thin layer cooling liquid also requires that used swashing in later step (4) Beam transparent, i.e. absorbance are more than 90%;
(3) applying pressure and make upper and lower two battery core Soft Roll aluminum-plastic composite membranes contact closely, contact stress is big In 1N/cm2
(4) use laser beam (9) incident from the top of transparent glass layer (7), laser beam (9) Through transparent glass layer (7), thin layer cooling liquid (8) and upper nylon layer (6), focus on upper aluminum layer (5) surface, upper aluminum layer (5) absorption laser, conduction of heat supreme PP layer (4) and lower PP layer (3), Make PP layer (4) and lower PP layer (3) fusing;
(5) stop irradiating or removing laser beam (9), the upper PP layer (4) of fusing and lower PP layer (3) Cooling solidification realizes secure rigid edge sealing rapidly;
(6) repeat step (4)-(5), make the scanning of laser beam continuous moving can realize continuous path weldering Connect.
The laser accurate welding method of Soft Roll aluminum hull battery core edge sealing the most according to claim 1, its Being characterised by, step also includes in (4): use another laser beam (9) simultaneously from lower nylon layer (1) Lower section incident, laser beam (9) passes through lower nylon layer (1), focuses on the surface of lower aluminum layer (2), Lower aluminum layer (2) absorbs laser, and conduction of heat, to lower PP layer (3) and upper PP layer (4), makes lower PP Layer (3) and upper PP layer (4) fusing;Carry out Laser Welding the most simultaneously.
CN201610442921.2A 2016-06-17 2016-06-17 A kind of laser accurate welding method of Soft Roll aluminum hull battery core edge sealing Active CN105914389B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108615828A (en) * 2018-03-30 2018-10-02 北京国能电池科技股份有限公司 The lithium ion battery of lithium ion battery encapsulating film, lithium ion battery packaging method and its preparation
WO2021143561A1 (en) * 2020-01-13 2021-07-22 比亚迪股份有限公司 Battery pack and electric vehicle

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CN2762360Y (en) * 2004-12-27 2006-03-01 比亚迪股份有限公司 Plastic nickel sheet injection and lid laser welding type battery sealing structure
CN201608231U (en) * 2009-12-31 2010-10-13 深圳市艾博尔新能源有限公司 9V flexibly-packaged lithium battery
CN202687165U (en) * 2012-06-21 2013-01-23 惠州Tcl金能电池有限公司 Polymer soft package lithium ion battery and structure for preventing aluminum plastic film corner position damage of polymer soft package lithium ion battery
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JP2002198012A (en) * 2000-12-26 2002-07-12 Fdk Corp Sealing device and sealing method of cylindrical cell
JP2004063406A (en) * 2002-07-31 2004-02-26 Sanyo Electric Co Ltd Laser sealing battery, its manufacturing method and laser irradiation apparatus
CN2762360Y (en) * 2004-12-27 2006-03-01 比亚迪股份有限公司 Plastic nickel sheet injection and lid laser welding type battery sealing structure
CN201608231U (en) * 2009-12-31 2010-10-13 深圳市艾博尔新能源有限公司 9V flexibly-packaged lithium battery
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WO2021143561A1 (en) * 2020-01-13 2021-07-22 比亚迪股份有限公司 Battery pack and electric vehicle

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