JP2000138057A - Solid electrolyte battery its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion of the contact part of an outer member and a lead wire for leading out the lead wire from the outer member. SOLUTION: This solid electrolyte battery has a stacked electrode body 2 with a solid electrolyte laid between a positive electrode and a negative electrode, lead wires 4 respectively connected to the positive electrode and the negative electrode and an outer member for sealing the stacked electrode body 2 while the lead wires 4 being led out. An adhesion improvement film 16 for improving adhesion to the outer member is formed on the lead wires 4 at least where the lead wires 4 come in contact with the outer member when led out from the outer member. The adhesion improvement film 16 is formed out of a first film 17 for directly covering the lead wires 4 and a second film 18 having higher adhesion to the outer member than the first film 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolyte battery using a solid or gel polymer material as an electrolyte and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, cordless and portable electronic devices have been desired, and portable electronic devices that are smaller, lighter, and thinner have been developed one after another. Accordingly, in these electronic devices, the ratio of the battery, which is the energy source, to the entire electronic device increases, and the power consumption tends to increase due to multifunctionalization. As described above, as a result of an increase in the capacity of the secondary battery due to an increase in the capacity of the battery, a demand for a more compact secondary battery having a high energy density is increasing.

Conventionally, lead storage batteries and nickel cadmium batteries have been used as secondary batteries. As new secondary batteries, nickel-metal hydride batteries and lithium-ion batteries have been put to practical use. However, these secondary batteries use a non-aqueous electrolyte, and thus have a problem of liquid leakage.

As an effective solution for the secondary battery, a so-called solid electrolyte battery using a solid or gel-like polymer material as an electrolyte has been proposed. Typical solid electrolyte batteries include a polymer lithium ion secondary battery using a gel electrolyte obtained by mixing a plasticizer into a polymer material, and a polymer solid electrolyte secondary battery using an ion conductive polymer. There is a secondary battery, and an inorganic solid electrolyte secondary battery using ion-conductive ceramics or ion-conductive glass. Since these solid electrolyte secondary batteries have no fear of liquid leakage, can be made smaller, lighter, thinner than before, and have a high energy density,
It is a highly promising secondary battery.

The structure of these solid electrolyte secondary batteries will be described by taking a polymer lithium ion secondary battery as an example. The conventional polymer lithium ion secondary battery 100 is shown in FIG.
As shown in FIG. 5, a laminated electrode body 101, a positive lead wire 102 and a negative lead wire 103 serving as external output terminals,
And a laminate film 104 as an exterior member.

The laminated electrode body 101 includes a positive electrode 107 in which a positive electrode active material layer 106 is formed on a positive electrode current collector 105;
A negative electrode 110 in which a negative electrode active material layer 109 is formed on a negative electrode current collector 108 is stacked with a separator 111 interposed therebetween.
Between the separator 10 and the separator 111
Is formed. In the laminated electrode body 101, a positive electrode lead wire 102 is connected to a positive electrode current collector 105, and a negative electrode lead wire 103 is connected to a negative electrode current collector 108.

After the laminated electrode body 101 is housed, the laminated film 104 is hermetically sealed by heat-sealing a sealing portion 104a serving as a housing opening.

In the conventional polymer lithium ion secondary battery 100 configured as described above, the laminated electrode body 101 is sealed in the laminated film 104 while the positive electrode lead 102 and the negative electrode lead 103 are led out to the outside. .

[0009]

In the above-described conventional polymer lithium ion secondary battery 100, the laminated electrode body 101 is connected to the laminated film 104 while the positive lead wire 102 and the negative lead wire 103 are led out.
When encapsulating the battery, the adhesion between the sealing portion 104a of the laminated film 104 and the positive electrode lead wire 102 and the negative electrode lead wire 103 is poor, and the sealing film 104 is peeled off after encapsulation, so that the airtightness inside the battery cannot be maintained. There is a problem that it is inferior in moisture permeability.

[0010] This is the same in other solid electrolyte secondary batteries, and its improvement is a major issue.

Therefore, the present invention has been proposed in view of such a conventional situation, and when a lead wire is led out from an exterior member, the adhesion at a portion where the lead wire comes into contact with the exterior member is improved. It is an object of the present invention to provide a solid electrolyte battery, and to provide a method for producing the same.

[0012]

A solid electrolyte battery according to the present invention that achieves this object has a structure in which a positive electrode and a negative electrode are laminated,
A laminated electrode body in which a solid electrolyte is disposed between a positive electrode and a negative electrode, a lead wire attached to each of the positive electrode and the negative electrode, and an exterior member that encapsulates the laminated electrode body while leading the lead wire to the outside. . At least a portion of the lead wire that comes into contact with the exterior member when it is led out from the exterior member is provided with a coating for improving adhesion to enhance the adhesion with the exterior member.

Further, the coating for improving adhesion is formed so as to cover the first coating directly covering the lead wire and the first coating, and has better adhesion to the exterior member than the first coating. And a second coating.

In the solid electrolyte battery according to the present invention configured as described above, the coating for improving adhesion is the first coating having excellent adhesion with the lead wire and the first coating having excellent adhesion with the exterior member. Since the lead wire is derived from the exterior member, the lead wire and the exterior member are more closely adhered to each other when the lead wire is derived from the exterior member.

[0015] Further, according to a method of manufacturing a solid electrolyte battery according to the present invention, which achieves this object, a laminated electrode body is sealed in an exterior member, and a lead wire is led out of the exterior member from the laminated electrode body. A method for manufacturing a solid electrolyte battery, comprising: a lead wire manufacturing step of manufacturing a lead wire, a lead wire attaching step of attaching a lead wire to a positive electrode and a negative electrode, respectively, and laminating a positive electrode and a negative electrode to which the lead wire is attached. In addition, a laminated electrode body manufacturing process of preparing a laminated electrode body by disposing a solid electrolyte between a positive electrode and a negative electrode, and a laminated electrode for encapsulating the laminated electrode body in an exterior member while leading a lead wire outside. And a body enclosing step. In the lead wire manufacturing step, a coating for improving the adhesion between the lead wire and the exterior member is formed on at least a portion that comes into contact with the exterior member when the lead wire is led out from the exterior member.

In the lead wire forming step, a first coating directly covering the lead wire and a second coating which is more excellent in adhesion to the package member than the first coating are used as the coating for improving the adhesion.
Is formed so that the second film covers the first film.

According to the method for producing a solid electrolyte battery of the present invention, the coating for improving adhesion is composed of a first coating having excellent adhesion to a lead wire and a second coating having excellent adhesion to an exterior member. Therefore, when the lead wire is led out from the exterior member, the lead wire and the exterior member are more closely adhered to each other.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. Solid electrolyte lithium ion secondary battery 1 shown in the drawings as an embodiment of the present invention
As shown in FIGS. 1 to 3, a laminated electrode body 2 and a lead wire 4 attached to the electrode 3 and serving as an external output terminal
And a laminate film 5 as an exterior member.

As shown in FIGS. 4 and 5, the laminated electrode body 2 has, for example, a positive electrode active material layer 7 made of LiCoO ₂ and graphite formed on a positive electrode current collector 6 made of aluminum foil. 8 and a negative electrode current collector 9 made of, for example, copper foil
Negative electrode 1 having negative electrode active material layer 10 made of mesocarbon microbeads, carbon, and natural graphite formed thereon
1 and the separator 12 are laminated and wound, and between the positive electrode 8 and the separator 12 and between the negative electrode 11 and the separator 12.
And the solid electrolyte layer 13 is formed between them.

As shown in FIG. 6, a positive electrode lead wire 14 made of, for example, aluminum is connected to the positive electrode current collector 6, and a negative electrode lead wire made of, for example, copper is connected to the negative electrode current collector 9. 15 are connected.

FIGS. 5 and 6 schematically show the structure of the laminated electrode assembly 2. A separator and a solid material (not shown) are provided between the wound positive electrode 8 and negative electrode 11. An electrolyte layer is interposed. The positive electrode 8 and the negative electrode 11 each have a current collector on which an active material layer is formed on one side, but may have both sides.

As the positive electrode current collector 6, other than the above-described aluminum foil, for example, a metal foil such as a nickel foil and a stainless steel foil can be used. Further, the negative electrode current collector 9
As, in addition to the copper foil described above, for example, nickel foil,
A metal foil such as a stainless steel foil can be used. These metal foils are preferably porous metal foils. By making the metal foil a porous metal foil, the adhesive strength between the current collector and the active material layer can be increased. As such a porous metal foil, in addition to a punching metal and an expanded metal, a metal foil having a large number of openings formed by an etching process can be used.

In order to form the positive electrode active material layer 7, a metal oxide, a metal sulfide or a specific polymer material is used as the positive electrode active material in addition to the above-described materials, depending on the type of the intended battery. be able to. As the positive electrode active material, for example, metal sulfides or oxides such as TiS ₂ , MoSe ₂ , and V ₂ O ₅ can be used. Also, Li _x MO
₂ (wherein M represents one or more kinds of transition metals, x varies depending on the charge / discharge state of the battery, and is 0.05 to 1.10). You can also. As a transition metal constituting the lithium composite oxide, Co, Ni, Mn, or the like is preferable. A specific example of such a lithium composite oxide is LiC
oO ₂ , LiNiO ₂ , LiNi _y Co _1-y O ₂ (wherein 0
<Y <1. ), LIMn ₂ O _{4 and the} like. The lithium composite oxide as described above can generate a high voltage and is a positive electrode material excellent in energy density.

In order to produce the positive electrode 8, a plurality of these positive electrode active materials may be used together. In producing the positive electrode 8, a known conductive agent or binder may be included.

In order to form the negative electrode active material layer 10, in addition to the materials described above as the negative electrode active material, lithium is doped.
It is preferable to use a material that can be dedoped. Materials that can be doped and undoped with lithium include:
For example, there are non-graphitizable carbon-based materials and graphite-based carbon materials. Specific examples of such carbon materials include pyrolytic carbons, cokes, graphites, glassy carbon fibers, organic polymer compound fired bodies, carbon fibers, and activated carbon. Examples of the coke include pitch coke, needle coke, petroleum coke, and the like. The fired organic polymer compound is obtained by firing a phenol resin, a furan resin or the like at an appropriate temperature and carbonizing the same. In addition to the carbon materials described above, examples of materials that can be doped and dedoped with lithium include polymers such as polyacetylene and polypyrrole and oxides such as SnO ₂ .

In order to produce the negative electrode 11, a plurality of these negative electrode active materials may be used together. Also,
When producing the negative electrode 11, a known conductive agent or binder may be included.

As the separator 12, for example, polypropylene, polyethylene, or a composite thereof can be used.

As the solid electrolyte 13, a gel electrolyte obtained by gelling a polymer material with a plasticizer or a completely solid electrolyte containing no solvent can be used.

Here, to form the gel electrolyte layer,
As the electrolytic solution, for example, esters, ethers, carbonates and the like can be used alone or as one component of a plasticizer.

As the electrolyte contained in the electrolytic solution, an electrolyte used in a normal battery electrolytic solution can be used. Specifically, LiPF ₆ , LiBF ₄ ,
LiAsF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , LiN
(SO ₂ CF ₃ ) ₂ , LiC (SO ₂ CF ₃ ) ₃ , LiAl
Examples thereof include lithium salts such as Cl ₄ and LiSiF ₆ .

As the polymer material gelled by the electrolyte (plasticizer), for example, polyethylene oxide, polyvinylidene fluoride, polyacrylonitrile and the like can be used.

On the other hand, the solid solid electrolyte containing no solvent includes a solid polymer electrolyte using an ion conductive polymer,
Furthermore, an inorganic solid electrolyte using ion-conductive ceramics or ion-conductive glass can be used.

For example, to form a solid polymer electrolyte,
A polymer complex in which an electrolyte is dissolved in a polymer matrix having an ether bond such as polyethylene oxide can be used. At this time, as the electrolyte, an electrolyte which is also used in a normal battery electrolyte can be used, and LiPF ₆ , LiBF ₄ , Li
AsF ₆ , LiClO ₄ , LiCF ₃ SO ₃ , LiN (S
O ₂ CF ₃ ) ₂ , LiC (SO ₂ CF ₃ ) ₃ , LiAlCl
₄ , lithium salts such as LiSiF ₆ can be used.

As the polymer matrix, not only the above-mentioned linear polymer such as polyethylene oxide, but also
Comb-type polymers having a side chain structure, or those having an inorganic polymer structure such as a siloxane structure or a polyphosphazene structure in the main chain can also be used, but, of course, are not limited to these. .

The positive electrode lead wire 14 and the negative electrode lead wire 15 can be made of a metal material such as nickel and stainless steel in addition to the above-mentioned aluminum and copper.
It is processed into a thin plate or mesh.

As shown in FIGS. 1 to 3, for example, the laminated film 5 is formed by laminating polyethylene terephthalate, aluminum foil, and polyethylene in this order.
It is formed from layers. The laminate film 5 is formed in a bag shape by laminating two upper and lower films with the polyethylene side as the inner surface. After storing the laminated electrode body 2, the laminated film 5 is hermetically sealed by heat-sealing a sealing portion 5a serving as a storage port.

In the solid electrolyte lithium ion secondary battery 1 according to the present invention having the above-described configuration, the laminated electrode body 2 is formed on the laminated film 5 while the positive electrode lead 14 and the negative electrode lead 15 are led out. Be enclosed.

In the solid electrolyte lithium ion secondary battery 1 according to the present invention, as shown in FIGS. 4 to 6, the laminated electrode body 2 is wound to reduce the battery thickness and increase the capacity. Although the structure is adopted, the present invention is not limited to this structure. The stacked electrode body 2 may have a folded structure as shown in FIG. In addition, the laminated electrode body 2
In this case, as shown in FIG. 8, a stacked structure may be adopted.

Further, in the laminated electrode body 2, the separator is interposed between the positive electrode 8 and the negative electrode 11 in the above-described example, but in the solid electrolyte lithium ion secondary battery 1, the separator is interposed between the positive electrode 8 and the negative electrode 11. Since the solid electrolyte layer 13 is formed on the first and second electrodes, the possibility of a short circuit therebetween is low. Therefore, the separator 12 may not be disposed between the positive electrode 8 and the negative electrode 11.

FIGS. 7 and 8 schematically show the configuration of the laminated electrode assembly 2. A separator and a solid material (not shown) are provided between the wound positive electrode 8 and negative electrode 11. An electrolyte layer is interposed. In addition, the positive electrode 8 and the negative electrode 11 each have an active material layer formed on one side of the current collector, but may have both sides.

Here, since the positive electrode 8 and the negative electrode 11 are members configured to be the same, they are collectively described as the electrode 3 unless otherwise specifically described. Similarly, the positive electrode lead wire 14 and the negative electrode lead wire 15 are collectively described as the lead wire 4 unless otherwise specifically described.

As described above, in the solid electrolyte lithium ion secondary battery 1, the adhesion between the resin material forming the sealing portion 5 a on the inner surface of the laminate film 5 and the lead wire made of the above-described metal material is performed. However, there is a problem that the airtightness inside the battery cannot be sufficiently maintained due to poor performance.

Therefore, in the solid electrolyte lithium ion secondary battery 1 of the present invention, as shown in FIGS. 1 to 4, when the lead wire 4 is led out from the laminate film 5, A coating 16 for improving adhesion is formed to increase the adhesion of the laminate film 5 to the seal portion 5a.

At this time, the coating 16 for improving the adhesion is formed as shown in FIG.
As shown in FIG. 1, the first coating 1 directly covering the lead wire 4
7 and a laminate film 5 more than the first coat 17.
The second coating 18 has excellent adhesion to the inner surface.

As the first coating 17, a resin material having excellent adhesion to the lead wire 4 and the second coating 18 made of a metal material is used. For example, ethylene methacrylic acid copolymer, ethylene acrylic acid copolymer is used. Polymers, ionomers, low density polyethylene, linear low density polyethylene and the like can be used.

As the second film 18, a resin material made of an insulator having excellent adhesion to the laminate film 5 is used. For example, low-density polyethylene, high-density polyethylene, linear low-density polyethylene, non-stretched Polypropylene or the like can be used. In particular, the solid electrolyte layer 13
Is a gel electrolyte, it is necessary to select a resin material which is not affected by the plasticizer (electrolyte solution) contained in the gel electrolyte.

FIGS. 10 and 11 show the first coating 17.
As shown in (a), since it is formed from a material containing a highly water-absorbing substance such as acrylic acid except for a part,
A second coating 18 is formed to cover the first coating 17.

Further, as shown in FIGS. 1 to 3, the second coating 18 is formed up to the part of the lead wire 4 which is led out of the laminate film 5. As described above, the second coating 18 is a coating made of an insulator, and is formed such that when it is coated on the lead wire 4 at the sealing portion 5a of the laminate film 5, it protrudes outside. Positive electrode lead wire 1 through aluminum material exposed from cut end face 5
4 and the negative electrode lead 15 can be prevented from short-circuiting, and electrical insulation can be maintained.

As described above, according to the solid electrolyte lithium ion secondary battery 1 according to the present invention, when the lead wire 4 is led out of the laminate film 5,
A coating 16 for improving adhesion is formed to increase the adhesion between the first film 17 having excellent adhesion to the lead wire 4 and the adhesion between the first film 17 and the laminate film 5. Since the lead film 4 is formed from the excellent second coating 18, the material, the type, and the shape of the lead wire 4 are not limited, and the lead wire 4 and the laminate film 5 can be easily thermally fused. As the resin material used as the second coating 18, when the laminate film 5 is thermally fused, a resin material having a melting point equal to or lower than that of the resin material on the inner surface of the laminate film 5 is used. Performance can be improved.

Therefore, in the solid electrolyte lithium ion secondary battery 1, the physical strength (peeling strength) between the lead wire 4 and the sealing portion 5a of the laminate film 5 is increased, so that the airtightness inside the battery is kept high. Can improve quality reliability.

In the conventional solid electrolyte lithium ion secondary battery 30, as shown in FIGS. 12 and 13, the positive electrode current collector and the negative electrode current collector constituting the laminated electrode body 31 are respectively provided for external output. When the lead wires 32 serving as terminals are attached, these lead wires 32 come into contact with the opposite polarities of the electrodes or the end faces of the current collectors to short-circuit or peel off the active material on the electrode end faces to improve the reliability of the battery. There was a damaging problem.

To solve this problem, a conventional lead wire 3
2, an insulating tape 34 made of polyimide or the like is wound between a portion attached to the electrode and a portion derived from the laminate film 33. However, in the conventional solid electrolyte lithium ion secondary battery 30, when the commercially available insulating tape 34 itself is thick, the local thickness of the lead wire 32 increases, and when the laminated electrode body 31 is sealed in the laminated film 33, Irregular thickness unevenness such as the convex portion 33a occurs. Also, the insulating tape 34
In this method, the adhesive applied to the bonding portion contains a large amount of a plasticizer, which causes a long-term adverse effect on the electrolyte.

Therefore, as shown in FIGS. 1 to 3, an insulating coating 19 made of an insulator is formed on the lead wire 4 between the portion connected to the electrode 3 and the lead-out portion of the laminate film 5. Have been. As shown in FIGS. 10 and 11B, the insulating film 19 may be made of the same material as the second film 18, that is, the insulating film 19 and the second film 18 may be used.
And may be integrally formed. Further, the insulating coating 19 may be made of another material for the purpose of enhancing the insulating properties, and examples thereof include polyimide and the like in addition to the material used for the second coating 18.

As described above, the lead wire 4 is connected to the negative electrode 11 or the negative electrode current collector 9 having a polarity opposite to that of the positive electrode lead wire 14.
And an insulating film 19 capable of extremely reducing the thickness of the end face of the positive electrode 8 or the positive electrode current collector 6, which is opposite in polarity to the negative electrode lead wire 15, to maintain the insulating property of the end face. Accordingly, when the laminated electrode body 2 is sealed in the laminated film 5, the thickness of the solid electrolyte lithium ion secondary battery 1 can be reduced without generating the irregular thickness unevenness described above.

In a conventional lead wire manufacturing process, as shown in FIG. 14, an insulating tape 34 is attached to the lead wires 32 by an automatic tape attaching machine. As shown in FIG. 15A, the insulating tape 34 is
It is pasted in one roll. Alternatively, as shown in FIG. 15B, the insulating tape 34 is attached to the lead wire 32 so as to overlap. However,
In the lead wire manufacturing process, the cutting function of the automatic tape sticking machine is deteriorated due to adhesion of the adhesive on the insulating tape 34, secondary contamination (deterioration with time due to the environment), etc., and the subsequent winding and bonding to the lead wire 32 is stabilized. In addition, the necessity of a tape replenishing operation or the like necessitates a reduction in the operation rate of the entire manufacturing facility. In addition, in the conventional lead wire manufacturing process, a production technology (productivity, low cost, etc.) for mass production, such as using an insulating tape 34 made of expensive polyimide, is used.
Has not been established.

Therefore, in the lead wire forming step, as shown in FIG.
A coating process for forming the adhesion improving coating 16 and the insulating coating 19 on the longer wire 20 at predetermined intervals is performed.

For example, after the first coating 17 is formed on the wire 20, the second coating 18 and the insulating coating 19 are integrally formed so as to cover the first coating 17. The thickness of the first coating 17 is, for example, 10 to 50 μm, and the thickness of the second coating 18 is
Is, for example, 30 to 100 μm. On the other hand, the thickness of the insulating coating 19 is, for example, less than 50 μm. Note that these thicknesses are not limited to the above-described thicknesses, and may be changed according to the thickness and shape of the lead wire 4 to be manufactured.

In the lead wire manufacturing step, the individual wires 4 are manufactured by cutting the wire 20 on which the coating is formed into a predetermined length.

As described above, in the lead wire manufacturing process, the wire material 20 to be the lead wire 4 is processed into a daisy chain at an arbitrary interval and wound up. Since a pasting machine is not required, the solid electrolyte lithium ion secondary battery 1 can be efficiently manufactured.

Next, a method of manufacturing the solid electrolyte lithium ion secondary battery 1 according to the present invention will be described with reference to an example of manufacturing a polymer lithium ion secondary battery.

The manufacturing process of the polymer lithium ion secondary battery includes a lead wire manufacturing process for manufacturing the above-described lead wire 4, a lead wire mounting process for mounting the lead wire 4 to the positive electrode 8 and the negative electrode 11, respectively. The attached positive electrode 8 and negative electrode 11 are laminated with a separator 12 interposed therebetween, and between the positive electrode 8 and the separator 12 and between the negative electrode 1 and the negative electrode 1.
A laminated electrode body producing step of producing a laminated electrode body 2 in which a solid electrolyte layer 13 is formed between a substrate 1 and a separator 12;
And a step of enclosing the laminated electrode body in the laminate film 5.

First, in the step of preparing a laminated electrode body, a mixing step, a coating step, an electrode material pressing step, a slitter step, a vacuum deposition furnace step, an electrolytic solution vacuum impregnation step, an electrolytic gel coating and a winding step are performed. A lead wire attaching step is performed between the vacuum deposition furnace step and the electrolytic solution vacuum impregnation step.

In the mixing step, as shown in FIG. 17, an electrode material 50 composed of an active material, a conductive material, a binder, a volatile solvent and the like is mixed and prepared by a mixer 51.

In the coating step, as shown in FIG. 18, an electrode material 50 is coated on a metal film 53 serving as a current collector supplied by a supply roll 52.
4 is roll coated. Although the above-described roll coater 54 was used for the application method, the invention is not limited to this, and any method may be used as long as it can be formed uniformly.
The metal film 53 coated with the electrode material 50 is baked and dried while passing through a drying furnace 55 to produce an electrode material 56. The electrode material 56 is wound by a winding roll 57 and sent to the next step.

In the electrode material pressing step, as shown in FIG.
However, in the press device 59, the electrode density is improved by being sandwiched between press rolls 60 and 61 supported opposite to each other and crushed in the same direction. The electrode material 56 that has been subjected to such press processing is taken up by a winding roll 62.
And is sent to the next process.

In the slitter process, as shown in FIG. 20, the electrode material 56 supplied by the supply roll 63 is cut into a desired width by the slitter 64, and the cut electrode tape 65 is taken up by each reel 66. Can be

In the vacuum drying furnace step, as shown in FIG.
By running the electrode tape 65 between the supply reel 68 and the take-up reel 69, the electrode tape 65 is sufficiently dried.

In the lead wire attaching step, as shown in FIG. 22, the lead wire 70 is connected to the electrode tape 65 so that the insulating film formed on the lead wire 70 contacts the end face of the electrode tape 65 supplied by the supply reel 71. Tab welding is performed on the tape 65.

In the electrolytic solution vacuum impregnation step, as shown in FIG.
5 is impregnated with an electrolytic solution in a reduced pressure atmosphere.

In the step of applying and winding the electrolytic gel, as shown in FIG. 24, the polymer material 7 for gelling the electrolytic solution is used.
2 is uniformly coated on both sides of the electrode tape 65, and a positive electrode 73 and a negative electrode 74 are produced.
The separator 75 and the negative electrode 74 are wound in this order to form a laminated electrode body 76. At this time, by selecting a winding method, a laminating method, a folding method, and the like of the laminated electrode body 76, the laminated electrode having a width and a thickness corresponding to the required dimensions and the capacity of the battery is changed. The body 76 can be made.

Next, in the laminated electrode body enclosing step, a bag filling step, a bag pressing step, and a vacuum sealing step are performed.

In the bag filling step, as shown in FIG. 25, a laminated electrode body 76 is housed inside a laminate film 77 as an exterior member.

In the bag pressing step, as shown in FIG. 26, the laminated film 77 containing the laminated electrode body 76 is crushed by press rolls 79 and 80 which are supported opposite to each other in a press device 78 to reduce the thickness. Be transformed into

In the vacuum sealing step, as shown in FIG.
By depressurizing the surroundings while deriving only the electrode, the laminated electrode body 76 is sealed inside the laminated film 77.
As a method for sealing the laminated film 77, a heat fusion bonding method (hot air type, hot plate sealing type, impulse sealing type, high frequency sealing type, ultrasonic sealing) is simple.
As long as the airtightness is high and the moisture permeability is good, an adhesive method or an adhesive application method (hot melt method, cold crew) may be used. In this vacuum sealing step, it is preferable to use a fusion bonding method from the viewpoints of low cost, quality, and workability.

Lastly, as shown in FIG. 28, a charge / discharge process is performed on the manufactured polymer lithium ion secondary battery 82 by a charge / discharge inspection device 83 to check whether normal charge / discharge is repeated.

[0076]

As described above in detail, according to the solid electrolyte battery and the method for manufacturing the same according to the present invention, the lead wire is provided with the coating for improving the adhesion to the exterior member. Since the coating for improving adhesion is formed from the first coating having excellent adhesion with the lead wire and the second coating having excellent adhesion with the exterior member, the lead wire is separated from the exterior member. In deriving, the lead wire and the exterior member become more intimate, so that the airtightness inside the solid electrolyte battery can be maintained at a high level, and a high-quality solid electrolyte battery with improved reliability can be manufactured. Can be.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a configuration of a solid electrolyte lithium ion secondary battery shown as an embodiment of the present invention.

FIG. 2 is a perspective front view illustrating the configuration of a solid electrolyte lithium ion secondary battery.

FIG. 3 is a perspective view showing a main part of a configuration of a solid electrolyte lithium ion secondary battery.

FIG. 4 is a perspective view illustrating a configuration of a stacked electrode body of the solid electrolyte lithium ion secondary battery.

FIG. 5 is a cross-sectional view illustrating a configuration of a stacked electrode body of the solid electrolyte lithium ion secondary battery.

FIG. 6 is a cross-sectional view schematically showing a configuration of a stacked electrode body of the solid electrolyte lithium ion secondary battery.

FIG. 7 is a sectional view showing a folded structure of a laminated electrode body of the solid electrolyte lithium ion secondary battery.

FIG. 8 is a cross-sectional view showing a stacked structure of a stacked electrode body of a solid electrolyte lithium ion secondary battery.

FIG. 9 is a front view illustrating a coating for improving adhesion formed on a lead wire of a solid electrolyte lithium ion secondary battery.

FIG. 10 is a front view illustrating a configuration of a lead wire of a solid electrolyte lithium ion secondary battery.

FIG. 11 (a) is a view of the lead wire A shown in FIG. 10;
11A is a cross-sectional view, and FIG. 11B is a BB cross-sectional view of the lead wire shown in FIG.

FIG. 12 is a transparent front view for explaining the configuration of a conventional solid electrolyte lithium ion secondary battery applied for comparison.

FIG. 13 is a front view illustrating a configuration of a conventional solid electrolyte lithium ion secondary battery applied for comparison.

FIG. 14 is a front view illustrating a configuration of a conventional lead wire applied for comparison.

FIG. 15A is a cross-sectional view illustrating a configuration of a conventional lead wire applied for comparison, and FIG.
FIG. 2B is a cross-sectional view illustrating another configuration of the conventional lead wire applied for comparison.

FIG. 16 is a view for explaining a lead wire manufacturing step in the method for manufacturing a solid electrolyte lithium ion secondary battery according to the present invention.

FIG. 17 is a perspective view showing a mixing step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 18 is a perspective view showing a coating step in a method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 19 is a perspective view showing an electrode material pressing step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 20 is a perspective view showing a slitter process in a method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 21 is a perspective view showing a vacuum drying furnace step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 22 is a perspective view showing a lead wire attaching step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 23 is a perspective view showing an electrolytic solution vacuum impregnation step in the method for producing a solid electrolyte lithium ion secondary battery.

FIG. 24 is a perspective view showing an electrolytic gel coating and winding step in the method for producing a solid electrolyte lithium ion secondary battery.

FIG. 25 is a perspective view showing a bag filling step in the method for producing a solid electrolyte lithium ion secondary battery.

FIG. 26 is a perspective view showing a bag pressing step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 27 is a perspective view showing a vacuum sealing step in the method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 28 is a perspective view showing a charge / discharge step in a method for manufacturing a solid electrolyte lithium ion secondary battery.

FIG. 29 is a cross-sectional view illustrating a configuration of a conventional solid electrolyte lithium ion secondary battery.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solid electrolyte lithium ion secondary battery, 2 laminated electrode bodies, 3 electrodes, 4 lead wires, 5 laminated films, 8 positive electrodes, 11 negative electrodes, 14 positive electrode lead wires, 15
Negative electrode lead wire, 16 coating for improving adhesion, 17 first coating, 18 second coating, 19 insulating coating

Claims (14)

[Claims] 1. A laminated electrode body in which a positive electrode and a negative electrode are laminated, and a solid electrolyte is disposed between the positive electrode and the negative electrode; a lead wire attached to each of the positive electrode and the negative electrode; And an exterior member for enclosing the laminated electrode body while leading out the outside. The lead wire has at least a portion that comes into contact with the exterior member when being led out from the exterior member, and has a close contact with the exterior member. A solid electrolyte battery, wherein a coating for improving adhesion is formed to enhance the adhesiveness. 2. The coating for improving adhesion of a first coating that directly covers the lead wire and a first coating that is formed to cover the first coating, wherein the first coating is formed on the outer member more than the first coating. The solid electrolyte battery according to claim 1, comprising a second coating having excellent adhesion. 3. The solid electrolyte battery according to claim 1, wherein the adhesion improving film is formed up to a portion of the lead wire which is led out of the exterior member. 4. The solid electrolyte battery according to claim 1, wherein said adhesion improving film is formed of an insulator. 5. An insulating coating made of an insulator is formed on at least a part of the lead wire between a portion connected to an electrode and a lead-out portion from the exterior member. The solid electrolyte battery according to claim 1, wherein 6. The solid electrolyte battery according to claim 1, wherein said solid electrolyte is a gel electrolyte. 7. The solid electrolyte battery according to claim 1, wherein the solid electrolyte is a complete solid electrolyte containing no solvent. 8. A method for manufacturing a solid electrolyte battery, wherein a laminated electrode body is sealed in an exterior member, and a lead wire is led out of the exterior electrode member from the laminated electrode body. Producing a lead wire to be produced, a lead wire attaching step of attaching the lead wire to a positive electrode and a negative electrode, and laminating the positive electrode and the negative electrode with the lead wire attached thereto, and between the positive electrode and the negative electrode. A laminated electrode body producing step of disposing a solid electrolyte in the laminated electrode body to produce the laminated electrode body, while leading the laminated electrode body out of the lead wire,
And a step of encapsulating the laminated electrode body in the exterior member.In the lead wire manufacturing step, at least a portion that comes into contact with the exterior member when the lead wire is led out from the exterior member includes the lead wire and A method for producing a solid electrolyte battery, comprising forming an adhesion-enhancing coating for increasing the adhesion to the exterior member. 9. In the lead wire manufacturing step, a first coating directly covering the lead wire is provided as the coating for improving the adhesion, and the first coating is more excellent in adhesion to the exterior member than the first coating. The method for manufacturing a solid electrolyte battery according to claim 8, wherein the second coating is formed so that the second coating covers the first coating. 10. The solid according to claim 8, wherein, in the lead wire forming step, the coating for improving adhesion is formed up to a portion of the lead wire led out of the exterior member. A method for manufacturing an electrolyte battery. 11. The method for manufacturing a solid electrolyte battery according to claim 8, wherein in the lead wire forming step, the coating for improving adhesion is formed from an insulator. 12. An insulating film made of an insulator is formed on at least a part between a portion connected to an electrode and a lead-out portion from the exterior member in the lead wire forming step. A method for manufacturing a solid electrolyte battery according to claim 8. 13. In the lead wire forming step, the adhesion improving film is formed at a predetermined interval on a wire longer than a lead wire provided in each solid electrolyte battery, and the adhesion improving film is 9. The method for manufacturing a solid electrolyte battery according to claim 8, wherein the formed wire is cut to form a lead wire for each solid electrolyte battery. 14. In the lead wire forming step, the adhesion improving film and the insulating film are formed at predetermined intervals on a wire longer than a lead wire provided in each solid electrolyte battery, and the films are formed. 13. The method for manufacturing a solid electrolyte battery according to claim 12, wherein the wire having the formed thereon is cut to obtain a lead wire for the individual solid electrolyte battery.