CN101542773A - Lead member, production method thereof and nonaqueous electrolytic electricity storage device - Google Patents

Lead member, production method thereof and nonaqueous electrolytic electricity storage device Download PDF

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Publication number
CN101542773A
CN101542773A CNA2008800001863A CN200880000186A CN101542773A CN 101542773 A CN101542773 A CN 101542773A CN A2008800001863 A CNA2008800001863 A CN A2008800001863A CN 200880000186 A CN200880000186 A CN 200880000186A CN 101542773 A CN101542773 A CN 101542773A
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China
Prior art keywords
nonaqueous electrolytic
storage device
conductor
electricity storage
lead member
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CNA2008800001863A
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Chinese (zh)
Inventor
宫泽圭太郎
福田丰
花房幸司
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Publication of CN101542773A publication Critical patent/CN101542773A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/10—Sealing, e.g. of lead-in wires
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • 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
    • H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

A lead member for use in a nonaqueous electrolytic electricity storage device which can prevent intrusion of moisture while exhibiting good bendability. A method for producing such a lead member and a nonaqueous electrolytic electricity storage device are also provided. Lead members (21a, 21b) for use in a nonaqueous electrolytic electricity storage device where an electrode body consisting of a positive electrode (11a) and a negative electrode (11b) and a nonaqueous electrolyte medium (13) are contained in an enclosure bag (6) made of a multilayer film (10) including a metal foil layer (8) comprise lead conductors (22a, 22b) connected with the electrode body, and insulators (23a, 23b) bonded to the lead conductors (22a, 22b) and then bonded to the inner surface of the enclosure bag (6). The insulators (23a, 23b) are formed by joining single layer resin films (crosslinked film (25)) of 20-40 [mu]m thick together while sandwiching the lead conductors (22a, 22b) and their entirety is crosslinked.

Description

Lead member and manufacture method thereof, nonaqueous electrolytic electricity storage device
Technical field
Lead member that the present invention relates in nonaqueous electrolytic electricity storage device, use and manufacture method thereof, use the nonaqueous electrolytic electricity storage device of this lead member.
Background technology
Current, in the miniaturization that requires electronic equipment, require battery miniaturization, lightweight as power supply.In addition, also have the requirement of high-energy-densityization, energy-efficientization, as the technology that satisfies above-mentioned requirements, more and more higher for the expectation of nonaqueous electrolytic batteries such as lithium ion battery.As the known following structure of nonaqueous electrolytic battery, positive pole, negative pole and electrolyte are contained in the encapsulation bag that is made of the plural layers that comprise metal foil layer, to lead to outside (for example, with reference to patent documentation 1) with the leading-in conductor that anodal, the battery lead plate of negative pole are connected.
Fig. 4 (A), Fig. 4 (B) and Fig. 5 are the figure that is illustrated in the summary of disclosed nonaqueous electrolytic battery in the above-mentioned patent documentation 1.This nonaqueous electrolytic battery forms with slim structure, the extension of pair of lead wires 1a, 1b is covered by insulator 3a, 3b respectively, and lead to the outside from the hermetic unit 14 of encapsulation bag 6.Encapsulation bag 6 is to utilize heat seal to carry out thermal welding by the hermetic unit 14 with circumference to form bag shape.Sealing contains positive pole, negative pole, barrier film etc. in encapsulation bag 6, and electrolyte (for example, lithium compound) is dissolved in the non-water kind solvent (for example, organic solvent) and the nonaqueous electrolytic medium of formation.
The a-a of Fig. 4 (A) presentation graphs 5 vows and looks section.The nonaqueous electrolytic battery has following structure, anodal 11a and negative pole 11b, barrier film 12, nonaqueous electrolytic medium 13 etc. are housed in the encapsulation bag 6 that forms bag shape, make lead-in wire (lead member) 1a, the 1b that are connected with anodal 11a, negative pole 11b lead to the outside under sealing state.Encapsulation bag 6 is to use the higher plural layers of sealing 10 and forms, and these plural layers 10 are pasted with the metal foil layer 8 that is made of metals such as aluminium at least with sandwich-like between innermost layer film 7 and outermost layer film 9.
In addition, at the hermetic unit 14 of the periphery of 2 plural layers 10 that are cut to rectangle, with frit seal and the encapsulation bag 6 of shape pouch each other between the innermost layer film 7.Leading-in conductor 2a, the 2b of the lead-in wire that is connected with anodal 11a, negative pole 11b covered by insulator 3a, 3b, so that its extension can electric short circuit not take place with the metal foil layer 8 of plural layers 10.The regulation edge portion of insulator 3a, 3b and encapsulation bag 6 is bonding and seal.
Cover insulator 3a, the 3b of the extension of this leading-in conductor 2a, 2b, b-b as Fig. 4 (A) vows that pseudosection is shown in Fig. 4 (B), be will be for example thermoplastic layer 4 and cross-linked layer 5 bonding and form by 2 layers, this thermoplastic layer 4 utilizes the thermoplastic resin membrane be made of vistanexes such as anhydrous maleic acid sex change low density polyethylene (LDPE) or anhydrous maleic acid sex change low density polypropylenes to form, and crosslinked resin film that crosslinked vistanexes such as low density polyethylene (LDPE) constitute forms by having carried out in cross-linked layer 5 utilizations.
Seal bondingly with the extension of leading-in conductor 2a, the 2b of lead-in wire thermoplastic layer's 4 heat welded of insulator 3a, 3b in advance, subsequently this insulator 3a, 3b are sandwiched the outlet of encapsulation bag 6.Then, by hermetic unit 14 sealings of heat seal with the periphery of plural layers 10.The material that is difficult for melting deformation under the temperature of the cross-linked layer 5 of insulator 3a, 3b during by this heat seal forms, therefore cross-linked layer 5 also remains between leading-in conductor 2a, the 2b and the metal foil layer 8 in the plural layers of lead-in wire behind heat seal, thereby need not to worry electric short circuit between leading-in conductor 2a, 2b and the metal foil layer 8.
In addition, anodal 11a and negative pole 11b constitute on metal bases such as metal forming that is called collector body or expanding metal and are formed with active material layer, will be connected with leading-in conductor 2a, 2b as the battery lead plate of electrode base material.In this connects, can utilize spot welding or ultrasonic bonding etc.
Patent documentation 1: Japanese publication, the spy opens the 2001-102016 communique
Summary of the invention
Being arranged on insulator 3a, 3b on the extension of leading-in conductor 2a, 2b, usually as shown in Figure 4, is to form by thermoplastic resin membrane that will form thermoplastic layer 4 and the crosslinked resin film applying that forms cross-linked layer 5.Above-mentioned resin film is difficult to than the unfertile land extrusion modling, will paste with thermoplastic resin membrane and crosslinked resin film that the thickness about 50 μ m forms usually, but thickness adds up to about 100 μ m.If the thickness of insulator is thicker, then make flexibility deficiency sometimes as lead-in wire, perhaps between the end of insulator and plural layers, produce the gap, and make the sealing between lead-in wire and the encapsulation bag insufficient, moisture is invaded to the encapsulation bag.
In addition, following technology is also disclosed in above-mentioned patent documentation 1, after pasting the monolayer thermoplastic resin film by thermal welding on the leading-in conductor, shine transmission apart from the electron ray that is controlled to be less than film thickness from this thermoplastic resin membrane's the outside, thereby the formation cross-linked layer, but do not have to describe at thermoplastic resin membrane's thickness.
The objective of the invention is to, a kind of lead member that is used for nonaqueous electrolytic electricity storage device and manufacture method thereof, nonaqueous electrolytic electricity storage device are provided, the bendability of this lead member is good, can prevent the intrusion of moisture.
The lead member that the present invention relates to, it is used for nonaqueous electrolytic electricity storage device, this nonaqueous electrolytic electricity storage device is in the encapsulation bag that is made of the plural layers that comprise metal foil layer, contain electrode body and nonaqueous electrolytic medium, it is characterized in that, this lead member has: leading-in conductor, and it is connected with the aforementioned electric polar body; And insulator, itself and this leading-in conductor is bonding, and it is bonding with the inner surface of aforementioned encapsulation bag, the aforementioned dielectric body is by the single-layer resin film that makes thickness be less than or equal to 40 μ m more than or equal to 20 μ m aforementioned leading-in conductor to be clipped in the middle and bonding formation, carries out crosslinked to the integral body of aforementioned dielectric body.
In addition, in the manufacture method of the lead member that the present invention relates to, aforementioned lead member is used for nonaqueous electrolytic electricity storage device, this nonaqueous electrolytic electricity storage device is in the encapsulation bag that is made of the plural layers that comprise metal foil layer, contain electrode body and nonaqueous electrolytic medium, it is characterized in that, with leading-in conductor that the aforementioned electric polar body is connected on, bonding and the coated insulation body in the mode that aforementioned leading-in conductor is clipped in the middle, by the irradiation of ionizing radiation aforementioned dielectric body integral body is carried out crosslinkedly then, this insulator is made of thickness is less than or equal to 40 μ m more than or equal to 20 μ m single-layer resin film.
In addition, the nonaqueous electrolytic electricity storage device that the present invention relates to, it contains electrode body and nonaqueous electrolytic medium in the encapsulation bag that is made of the plural layers that comprise metal foil layer, it is characterized in that having the lead member that the invention described above relates to.
The effect of invention
According to the present invention, can make the thickness attenuation of the insulator of lead member, compared with prior art, can improve the flexibility of lead member.In addition because make insulator and leading-in conductor cementability good in, can be by the crosslinked thermal endurance that improves insulator, therefore can suppress the change of shape of insulator.Therefore, can connect airtight with the film that encapsulates bag well.Thus, because draw the sealing raising of the part of lead member from the encapsulation bag, therefore can prevent the intrusion of moisture.And, when forming the resin film of insulator, do not need bondingly with thermoplastic layer and cross-linked layer, therefore can reduce by pasting peeling off of producing at the interface or possibility that micro-crack causes reliability to reduce.In addition, can realize miniaturization, the slimming of electrical storage device.
Description of drawings
Fig. 1 is the oblique view of summary of an example of expression nonaqueous electrolytic battery involved in the present invention.
Fig. 2 is the figure of summary of the lead member of expression nonaqueous electrolytic battery involved in the present invention, is that the a-a of Fig. 1 vows pseudosection.
Fig. 3 is the figure of summary of the manufacture method of expression lead member involved in the present invention.
Fig. 4 is the figure of expression prior art, is that the a-a of Fig. 5 vows pseudosection.
Fig. 5 is the oblique view of summary of an example of the existing nonaqueous electrolytic battery of expression.
The explanation of label
6 ... the encapsulation bag, 7 ... the innermost layer film, 8 ... metal foil layer, 9 ... the outermost layer film, 10 ... plural layers, 11a ... anodal, 11b ... negative pole, 12 ... barrier film, 13 ... the nonaqueous electrolytic medium, 14 ... hermetic unit, 21a, 21b ... lead member, 22a, 22b ... leading-in conductor, 23 ... the resin film sheet, 23a, 23b ... insulator, 25 ... crosslinked film
Embodiment
The example of embodiments of the present invention is described with reference to the accompanying drawings.Nonaqueous electrolytic battery involved in the present invention, as among Fig. 1 as shown in the example, adopt slim structure, the extension of leading-in conductor 22a, the 22b of pair of lead wires parts 21a, 21b is covered by insulator 23a, 23b respectively, lead to the outside from the hermetic unit 14 of encapsulation bag 6, roughly the same from saying in appearance with existing nonaqueous electrolytic battery.
As the encapsulation bag 6 of the encapsulation bag of accommodating electrode body, nonaqueous electrolytic medium etc., for example form hermetic unit 14 and make pouch by 2 films are carried out heat seal at their circumference.Positive pole, negative pole, barrier film etc. are accommodated in sealing in encapsulation bag 6, and electrolyte (for example lithium compound) is dissolved in the nonaqueous electrolytic medium (electrolyte) that forms in the non-water kind solvent (for example, organic solvent). Lead member 21a, 21b are drawn from hermetic unit 14, and to be electrically connected with the outside, this extension covers insulation by insulator 23a, 23b, with not can with electric contact of metal foil layer in the plural layers that form encapsulation bag 6.
Fig. 2 is the figure of the summary of expression nonaqueous electrolytic battery involved in the present invention, show leading-in conductor 22a, the 22b of lead member 21a, 21b are covered by insulator 23a, 23b, and lead to outside structure from the part of the hermetic unit 14 of encapsulation bag 6 shown in Figure 1.Explanation in the same manner in encapsulation bag 6 and the earlier figures 4, form by plural layers 10, can improve for the sealing that is housed in the electrolyte in the encapsulation bag 6, wherein, these plural layers 10 are by between innermost layer film 7 and outermost layer film 9, paste at least the metal foil layer 8 that is made of metals such as aluminium and form with sandwich-like.
In addition, the plural layers 10 of encapsulation bag 6 are made of for example 3～5 layers duplexer, for its innermost layer film 7, as can and not being applicable to the material that prevents that electrolyte from spilling from hermetic unit 14 by the electrolyte dissolving, use vistanex (for example, anhydrous maleic acid sex change low density polyethylene (LDPE), anhydrous maleic acid sex change low density polypropylene).Outermost layer film 9 is waited by polyethylene terephthalate (be called for short PET) and forms, and is used to protect the metal foil layer 8 of inboard not to be subjected to outer damage.
As the electrolyte that is housed in the encapsulation bag 6, use in organic solvents such as propene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxy ethane, oxolane dissolving LiCLO 4, LiBF 4, LiPF 6, LiAsF 6The nonaqueous electrolyte that forms Deng electrolyte, or lithium-ion-conducting solid electrolyte etc.
Electrode body has the structure that forms active material layer on the metal base of metal forming that is called collector body or expanding metal by constituting across barrier film 12 relative anodal 11a and negative pole 11b.Anodal 11a constitutes on the electrodes conduct body that aluminium foil is made, and forms by LiCoO 2Etc. the reproducibility oxide powder, as the carbon dust of conductor agent and the active material that constitutes as the adhesive of binding agent.Negative pole 11b constitutes on the electrodes conduct body that is made of Copper Foil, forms by carbon dust and the active material that constitutes as the adhesive of binding agent.Be configured in the barrier film 12 between anodal 11a and the negative pole 11b, form by the TPO perforated membrane that has electric insulating quality and have an ionic conductivity.
On anodal 11a, negative pole 11b, connect leading-in conductor 22a, the 22b of lead member and the electric outside that leads to by spot welding or ultrasonic bonding etc.The leading-in conductor 22a that is connected with anodal 11a is preferably formed by the aluminium identical with battery lead plate, titanium or their alloy, to prevent because of becoming positive high potential, causes dissolving owing to contacting with electrolyte.For the leading-in conductor 22b that is connected with negative pole 11b, because can separate out lithium owing to overcharging, owing to making current potential, overdischarge uprises, therefore preferably form, be difficult for being difficult for forming alloy with lithium and being difficult for dissolving at high potential by the lithium burn into by the copper identical, nickel or their alloy with battery lead plate.
Insulator 23a, 23b with the extension of leading-in conductor 22a, the 22b of lead member covers form by pasting individual layer crosslinked film 25.Crosslinked film 25 integral body on whole thickness direction has been carried out crosslinked.Crosslinked degree defines with gel fraction, if gel fraction more than or equal to 20%, then can think taken place crosslinked.Under the situation of crosslinked film 25, not needing gel fraction is 100%.If gel fraction is 70%, then can think crosslinked fully.The inside part of this crosslinked film 25 and leading-in conductor 22a, 22b are bonding and integrated, and Outboard Sections is bonding with the innermost layer film 7 of encapsulation bag 6, with the extension sealing of leading-in conductor 22a, 22b.
More than, with the nonaqueous electrolytic battery is that example is illustrated, but, also have the structure that uses electrode body and nonaqueous electrolytic medium in the same manner, so the present invention also is applicable to the double charge layer capacitor that the nonaqueous electrolytic capacitor is such with secondary cell for double charge layer capacitor.Therefore, in the present invention, with comprise nonaqueous electrolytic battery and nonaqueous electrolytic capacitor at interior nonaqueous electrolytic electricity storage device as object.
Nonaqueous electrolytic capacitor (diagram omit) also constitutes, and the pair of electrodes body (according to voltage application, and being divided into positive pole and negative pole) that disposes across barrier film be impregnated in the nonaqueous electrolyte, is housed in the encapsulation bag etc.As the employed representative electrolyte of nonaqueous electrolyte, for example can enumerate propene carbonate etc.The electrode material of electrode body uses activated carbon or carbon fiber, carries out activation processing with increasing specific surface area, mixes with electric conducting material or cross-linked material then and with tabular moulding.Subsequently, should tabular activated carbon engage with metal base and make electrode body, the leading-in conductor of above-mentioned lead member is connected with metal base.
Fig. 3 is the figure of an example of the explanation summary of above-mentioned lead member 21a, 21b and manufacture method thereof, and Fig. 3 (A) expression is covered the outward appearance under the state of extension of leading-in conductor 22a, 22b by insulator 23a, 23b.This lead member 21a, 21b can be by the method manufacturings shown in Fig. 3 (B)～Fig. 3 (D).
At first, shown in Fig. 3 (B), for example utilize insulator 23a, 23b clamping and cladding thickness to be flat leading-in conductor 22a about for 5.0mm of 0.1mm, width, the two sides of 22b.As the base material of insulator 23a, 23b, used thickness is less than or equal to the rectangle resin film sheet 23 of 40 μ m.As this resin film sheet 23, for example use thermoplastic polyolefin resin's film etc., preferably use in sour sex change polypropylene film or the sour sex change low-density polyethylene film, fusing point is the material of 120 ℃～160 ℃ of degree.Subsequently, shown in Fig. 3 (C),, for example be heated to about 150 ℃ by heater H on one side at resin film sheet 23, to the surface of leading-in conductor 22a, 22b push on one side, thereby undertaken bonding integrated by thermal welding.
Then, shown in Fig. 3 (D), to ionizing radiation E such as the surface irradiation electron ray of the bonding resin film sheet 23 of leading-in conductor 22a, 22b or gamma-rays and carry out crosslinked.By irradiation ionizing radiation E, make resin film sheet 23 on its whole thickness, carry out crosslinked and become crosslinked film 25, the bonding force to leading-in conductor 22a, 22b is improved.Can think that the heating when crosslinked film 25 is by radiation exposure produces annealing effect, bonding force is improved.
For the irradiation of ionizing radiation E, need sufficient exposure so that resin film sheet 23 is whole crosslinked, if but excessively irradiation then can cause resin aging can make bonding force and cohesiveness descend.Crosslinked by integral body being carried out with the degree that excessively irradiation does not take place, to compare with partial cross-linked, the illuminate condition scope that can access qualified product is wideer, improves rate of finished products.
In addition, resin film sheet 23 is being carried out to add crosslinking coagent in advance when crosslinked.
As crosslinking coagent, ester class that can the acid of illustration acrylic or methacrylic, divinyl compound, the ester class of allyl alcohol and acrylic or methacrylic acid etc.Specifically can enumerate following material etc., that is: the ester class of acrylic or methacrylic acid such as glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, ethylene glycol dimethacrylate, trimethylol-propane trimethacrylate; Divinyl compounds such as divinylbenzene, divinyl pyridine; And maleic acid diaryl ester, fumaric acid diaryl ester, triallyl cyanurate, triallyl isocyanurate etc., the ester class of allyl alcohol and acrylic or methacrylic acid.
For the addition of crosslinking coagent, though the big more then degree of cross linking of addition is high more, because the heat-resistant aging variation so need to select optimum value, is advisable to be less than or equal to 23 weight %.
In the present embodiment, use triallyl isocyanurate (TAIC (registered trade mark) that " Japan changes into (strain) " makes etc.), its addition is 0.5～10 weight %.
In addition, for the illuminate condition of ionizing radiation E, if represent with absorbed dose then be 50～200kGy.With 100kGy is that central value is shone, and also can have ± width of 30kGy degree.
If crosslinking coagent uses triallyl isocyanurate, then may be at the unreacted triallyl isocyanurate of the interface of metal and film emersion (oily), and make bonding force descend (the particularly few and residual situation that triallyl isocyanurate is arranged of exposure).Therefore, use the crosslinking coagent of non-oily to get final product.For example, ((solidifying point is 45～55 ℃ to three (2-acryloxy ethyl) chlorinated isocyanurates can to enumerate the FA-731A of " Hitachi changes into (strain) ".Be solid at normal temperatures)).The addition of FA-731A is 5～20% degree, preferred 10～15%.If surpass 20% then be difficult to mix.Under the situation of less than 5%, to compare gel fraction less with triallyl isocyanurate.
Even be liquid crosslinking coagent at normal temperatures, if molecular weight big (oligomer, prepolymer) then also can reduce to moving of surface.For example, prepolymer can example illustrate polypropylene glycol #700 acrylate (FA-P270A of " Hitachi changes into (strain) ").
The crosslinked film 25 of above-mentioned insulator 23a, 23b, ground same as the prior art, bonding well and leading-in conductor is sealed with the surface of leading-in conductor 22a, 22b.In addition,, suppress the change of shape of insulator 23a, 23b by the crosslinked thermal endurance that can improve insulator, can sealing well with the innermost layer film thermal welding of encapsulation bag.
In the present invention, as mentioned above, insulator 23a, 23b form by pasting single-layer resin film (crosslinked film 25), therefore with existing with the thermoplastic resin membrane with pass through crosslinked bonding the comparing of resin film, can reduce the thickness of insulator.Can make the thickness of single-layer resin film be less than or equal to 40 μ m.Therefore, the length of the part that is bonded of 2 resin films is less than or equal to 80 μ m.But if the thickness of single-layer resin film is less than or equal to 20 μ m, then the metallic bur power of leading-in conductor may puncture insulator, in addition, from the property easy to manufacture aspect of resin film, is preferably greater than or equals 20 μ m.
In addition, by form the insulator of lead member by single-layer resin film (crosslinked film 25), can save existing with 2 operations that resin film is bonding.Its result can reduce cost, and can eliminate simultaneously by pasting peeling off at the interface, possibility that micro-crack causes reliability to reduce.In addition, be less than or equal to 40 μ m, can improve the flexibility of lead member, thus, can improve the setting to electronic equipment, the degree of freedom that is electrically connected, can realize miniaturization, the slimming of electrical storage device simultaneously by the thickness that makes insulator.
The present invention at length and with reference to specific implementations is illustrated, but it will be apparent to one skilled in the art that and under the situation that does not break away from the spirit and scope of the present invention, to carry out various changes or modification.

Claims (3)

1. lead member, it is used for nonaqueous electrolytic electricity storage device, and this nonaqueous electrolytic electricity storage device contains electrode body and nonaqueous electrolytic medium in the encapsulation bag that is made of the plural layers that comprise metal foil layer,
It is characterized in that,
This lead member has: leading-in conductor, and it is connected with the aforementioned electric polar body; And insulator, itself and this leading-in conductor is bonding, and bonding with the inner surface of aforementioned encapsulation bag,
The aforementioned dielectric body is by the single-layer resin film that makes thickness be less than or equal to 40 μ m more than or equal to 20 μ m aforementioned leading-in conductor to be clipped in the middle and bonding formation, carries out crosslinked to the integral body of aforementioned dielectric body.
2. the manufacture method of a lead member, aforementioned lead member is used for nonaqueous electrolytic electricity storage device, and this nonaqueous electrolytic electricity storage device contains electrode body and nonaqueous electrolytic medium in the encapsulation bag that is made of the plural layers that comprise metal foil layer,
It is characterized in that,
With leading-in conductor that the aforementioned electric polar body is connected on, bonding and the coated insulation body in the mode that aforementioned leading-in conductor is clipped in the middle, by the irradiation of ionizing radiation aforementioned dielectric body integral body is carried out crosslinkedly then, this insulator is made of thickness is less than or equal to 40 μ m more than or equal to 20 μ m single-layer resin film.
3. nonaqueous electrolytic electricity storage device, it contains electrode body and nonaqueous electrolytic medium in the encapsulation bag that is made of the plural layers that comprise metal foil layer,
It is characterized in that,
Has the described lead member of claim 1.
CNA2008800001863A 2007-07-19 2008-07-16 Lead member, production method thereof and nonaqueous electrolytic electricity storage device Pending CN101542773A (en)

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TWI389373B (en) 2013-03-11
TW200908420A (en) 2009-02-16

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