JP2011113718A - Winding-type all-solid battery, and manufacturing method of winding-type all-solid battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding-type all-solid battery hardly short-circuiting and excellent in shape maintenance properties. <P>SOLUTION: The winding-type all-solid battery is made by winding, around a core material with a groove, a battery element laminate having: a battery element composed by laminating a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer; and a separator laminated at least either outside the positive electrode layer or outside the negative electrode layer of the battery element. An end part at a winding center side of the battery element laminate is fixed inside the groove of the core material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wound type all-solid-state battery that is not easily short-circuited and has excellent shape maintainability.

  Among various batteries, lithium batteries, which are lightweight and have the advantages of high output and high energy density, are widely used as power sources for small portable electronic devices and portable information terminals, and support the current information society. Further, lithium batteries are attracting attention as power sources for electric vehicles and hybrid vehicles, and further higher energy density, improved safety, and larger size are required.

  The lithium battery currently on the market uses an organic electrolyte that uses a flammable organic solvent as a solvent. Improvement is required. In contrast, an all-solid lithium battery, in which the liquid electrolyte is changed to a solid electrolyte and the battery is all solid, does not use a flammable organic solvent in the battery, so the safety device can be simplified, and manufacturing costs and production can be simplified. It is considered to be excellent in performance.

  In such an all solid lithium battery, as described above, a wound battery and a stacked battery have been studied in order to increase the energy density. However, safety measures for all-solid-state lithium batteries are not yet sufficient. For example, in a wound-type all-solid-state lithium battery in which a battery element laminate in which electrodes and a solid electrolyte are laminated is wound, There is a possibility that a short circuit may occur in a region where stress is easily applied, and countermeasures for the short circuit are being studied. For example, in Patent Document 1, a battery element stack in which electrode layers and the like are stacked in a specific order on a substrate is wound into a flat plate shape so that the substrate side is on the inside, thereby generating a short circuit at a bent portion. A wound all-solid battery that enables a reduction in probability is disclosed. However, there is a problem that a short circuit occurs at the end of the battery element laminate on the winding center side because the end on the winding center side that is the starting portion of the battery element laminate is not fixed anywhere. .

JP 2004-319449 A

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide a wound all-solid battery that is difficult to short-circuit and has excellent shape maintainability.

  In order to achieve the above object, in the present invention, a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer A battery-type laminated body in which a battery element laminate having a battery element laminated with a separator laminated on the outside of the positive electrode layer or the negative electrode layer of the battery element is wound around a core material having a groove A winding type all solid state battery is provided, wherein an end of the battery element laminate on the winding center side is fixed in a groove of the core material.

  According to the present invention, the end of the battery element laminate on the winding center side is fixed in the groove of the core material, so that the starting portion of the battery element laminate is firmly fixed to the core material. can do. Thereby, it becomes difficult to receive the influence of the stress inside a battery with respect to the edge part by the side of the winding center of the said battery element laminated body, and it is hard to generate | occur | produce a short circuit. In addition, the shape of the wound all-solid battery can be maintained and the production of the wound all-solid battery can be facilitated.

  In the said invention, it is preferable that the width | variety of the groove | channel of the said core material is the same width as the film thickness of the said battery element laminated body. This is because the end portion on the winding center side of the battery element laminate is more firmly fixed in the groove of the core material, and a short circuit can be more unlikely to occur.

  In the present invention, a core material having a groove, a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, And a battery element laminate having a separator, a fitting step of fitting the end of the battery element laminate into the groove of the core material, and the battery element laminate to the core material A winding type all-solid-state battery manufacturing method characterized by comprising a winding step of winding.

  According to the present invention, the end of the battery element laminate is fitted into the groove of the core material, and the battery element laminate is wound around the core material, so that it is difficult to short-circuit and has excellent shape maintainability. A wound type all-solid battery can be obtained.

  In this invention, there exists an effect that the winding type all-solid-state battery which is hard to be short-circuited and was excellent in the shape maintenance property can be obtained.

It is a schematic sectional drawing which shows an example of the winding type all-solid-state battery in this invention. It is a schematic sectional drawing which shows an example of the groove | channel of the core material in this invention. It is a schematic sectional drawing which shows an example of the edge part of the battery element laminated body in this invention. It is a schematic perspective view which shows an example of the manufacturing method of the winding type all-solid-state battery in this invention.

  Hereinafter, the wound type all-solid battery and the method for producing the wound type all solid battery of the present invention will be described in detail.

A. First, the wound type all solid state battery of the present invention will be described. The wound all-solid battery of the present invention includes a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer. A wound all-solid battery in which a battery element laminate having a battery element and a separator laminated on the outside of the positive electrode layer or the negative electrode layer of the battery element is wound around a core material having a groove. And the edge part by the side of winding center of the said battery element laminated body is being fixed in the groove | channel of the said core material, It is characterized by the above-mentioned.

  FIG. 1 is a schematic cross-sectional view showing an example of a wound all-solid battery of the present invention. A wound all-solid battery 20 shown in FIG. 1A includes a core material 13 and a wound body 14 housed in a battery case 15. Further, the wound body 14 includes a positive electrode layer 1 containing a positive electrode active material and a negative electrode layer 2 containing a negative electrode active material, as shown in FIG. 1 (b) which is an enlarged view of a portion A in FIG. 1 (a). And a battery element laminate 12 having a battery element 10 in which a solid electrolyte layer 3 formed between the positive electrode layer 1 and the negative electrode layer 2 is laminated, and a separator 11 laminated outside the negative electrode layer 2. It is wound around the core material 13. In the present invention, as shown in FIG. 1B, the main feature is that the end of the battery element laminate 12 on the winding center side is fixed in the groove 16 of the core member 13.

  According to the present invention, the winding center side end of the battery element laminate is fixed in the groove of the core material, so that the winding start portion of the battery element laminate is cored. Can be firmly fixed to the material. Thereby, it becomes difficult to receive the influence of the stress inside a battery with respect to the edge part by the side of the winding center of the said battery element laminated body, and it is hard to generate | occur | produce a short circuit. In addition, the shape of the wound all-solid battery can be maintained and the production of the wound all-solid battery can be facilitated.

  The wound all solid battery of the present invention has at least a core material and a battery element laminate. Hereinafter, the wound all solid state battery of the present invention will be described for each configuration.

1. Core Material First, the core material in the present invention will be described. The core material in the present invention has a groove. When the core material has the groove, the battery element laminate including the battery element and the separator can be fitted into the groove of the core material and fixed to the core material.

The groove | channel of the core material in this invention is formed in the axial direction of the outer periphery of a core material. The groove | channel of the said core material may be formed in the whole surface of a core material, and may be formed partially.
Further, as shown in FIG. 2 (a), the groove of the core material may be formed in parallel to a line connecting the center of the groove and the center of the outer periphery of the core material. As shown in the figure, the groove of the core material may be formed with a predetermined angle with respect to a line connecting the center of the groove and the center of the outer periphery of the core material. As shown in FIG. 2 (b), the groove of the core material is formed obliquely, so that the radius of curvature of the end portion on the winding center side of the battery element laminate is increased, and a short circuit can be prevented. It becomes easy to wind the battery element laminate on the core material.

  The depth of the groove of the core material in the present invention is not particularly limited as long as it can fit the battery element laminate, and varies depending on the type of the intended wound all-solid battery. However, it is usually preferable to be in the range of 0.05 mm to 100 mm, especially in the range of 0.1 mm to 10 mm.

In addition, the width of the groove of the core material in the present invention is not particularly limited as long as it can fit the battery element laminate, but the width of the battery element laminate of the wound all-solid battery used is not limited. The width is preferably the same as the film thickness. Here, the “same width” is within a range of 1 to 1.3, preferably within a range of 1.05 to 1.15, when the thickness of the battery element laminate is 1. And
Thus, by setting it as the same width | variety, the edge part by the side of winding center of a battery element laminated body is firmly fixed in the groove | channel of a core material, and it can make it more difficult to produce a short circuit.

  If the width of the groove is narrower than the film thickness of the battery element laminate, a short circuit is likely to occur between the positive electrode layer and the negative electrode layer. On the other hand, if the width of the groove is wider than the film thickness of the battery element laminate, the battery element laminate is It shifts in the groove of the core material and cannot be fixed.

  The method for forming the groove as described above in the core material in the present invention is not particularly limited. For example, a method for cutting the core material and a mold having a shape capable of forming a groove in the core material are used. And a method of forming by injection molding.

  As a method of fixing the end portion on the winding center side of the battery element laminate in the groove of the core member in the present invention, the end portion on the winding center side of the battery element laminate is removed from the groove of the core member. There is no particular limitation as long as it is a method of fixing in the groove of the core material. For example, a method of directly sandwiching an end of the battery element laminate on the winding center side into a groove of a core material having a width slightly narrower than the thickness of the battery element laminate, an end of the battery element and the separator on the winding center side A method of fixing the part and the groove of the core material with an adhesive can be exemplified.

  The core material in the present invention is not particularly limited as long as it has insulating properties. For example, polyethylene (PE), polyamide (PA), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate ( Polymer resin such as PEN).

  In addition, examples of the shape of the core material in the present invention include a flat plate shape and a cylindrical shape. The shape, size, and the like of the core material are preferably selected as appropriate according to the use of the wound all-solid battery.

2. Battery Element Laminate Next, the battery element laminate in the present invention will be described. The battery element laminate in the present invention includes a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a battery in which a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer is laminated. It has an element and the separator laminated | stacked on at least one of the outer side of the positive electrode layer of the said battery element, or the outer side of a negative electrode layer.

The end of the battery element laminate on the winding center side is fixed to the groove of the core material described above, and the other part is wound around the core material, whereby the winding of the present invention is performed. Type all-solid-state battery.
Here, the end portion on the winding center side may be fitted over the entire width in the groove of the core member, or may be partially fitted. In the case of being partially fitted, a method may be employed in which a convex portion for fitting is formed at the end on the winding center side and this is fitted.

  Moreover, you may provide the fitting member for fixing in the groove | channel of the said core material in the edge part of the winding center side of the said battery element laminated body. Specifically, as shown in FIG. 3, a positive electrode layer 1 containing a positive electrode active material, a negative electrode layer 2 containing a negative electrode active material, and a solid electrolyte formed between the positive electrode layer 1 and the negative electrode layer 2 The end of the battery element laminate 12 having the battery element 10 in which the layer 3 is laminated and the separator 11 laminated on the outside of the negative electrode layer 2 is covered with the fitting member 17, and the fitting member 17 is placed in the groove 16 of the core member 13. The example which fixes the battery element laminated body 12 to the core material 13 by fitting in can be given.

  Hereinafter, each member of such a battery element laminate will be described.

(1) Battery element The battery element in the present invention comprises a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer. Laminated.

(A) Positive electrode layer The positive electrode layer in the present invention is a layer containing at least a positive electrode active material, and may contain at least one of a solid electrolyte material, a conductive material, and a binder as necessary. . Especially, in this invention, it is preferable that a positive electrode layer contains sulfide type solid electrolyte material as a solid electrolyte material. It is because it can be set as the winding type all-solid-state battery excellent in the output characteristic.

i) Cathode Active Material The cathode active material used in the present invention is not particularly limited as long as it is generally used as a cathode active material for a wound all-solid battery. Mention may be made of substances. By using the oxide positive electrode active material, a wound type all-solid battery having a high energy density can be obtained.
Examples of the oxide positive electrode active material used in the present invention include a general formula Li _x M _y O _z (M is a transition metal element, x = 0.02 to 2.2, y = 1 to 2, z = The positive electrode active material represented by 1.4-4) can be mentioned. In the above general formula, M is preferably at least one selected from the group consisting of Co, Mn, Ni, V, Fe and Si, and is at least one selected from the group consisting of Co, Ni and Mn. It is more preferable.
As such an oxide positive electrode active material, specifically, LiCoO ₂ , LiMnO ₂ , LiNiO ₂ , LiVO ₂ , LiNi _1/3 Co _1/3 Mn _1/3 O ₂ , LiMn ₂ O ₄ , Li ( Ni _0.5 Mn _1.5 ) O ₄ , Li ₂ FeSiO _4, Li ₂ MnSiO _{4 and the} like can be mentioned.
Examples of the oxide positive electrode active material other than the above general formula Li _x M _y O _z include olivine-type positive electrode active materials such as LiFePO ₄ and LiMnPO ₄ .
Examples of the positive electrode active material other than the oxide positive electrode active material include chalcogenides such as Cu ₂ Mo ₆ S ₈ , FeS, CoS, and NiS.
Among them, as the positive electrode active material used in the present _invention, LiCoO 2, LiNiO ₂ are preferable, LiCoO ₂ is preferable. This is because it has good characteristics as an active material for the positive electrode and is widely used.

Examples of the shape of the positive electrode active material used in the present invention include particles, and among them, a true spherical shape or an elliptical spherical shape is preferable. Moreover, when a positive electrode active material is a particulate form, it is preferable that the average particle diameter exists in the range of 0.1 micrometer-50 micrometers, for example. The average particle diameter may be a value calculated by a laser diffraction particle size distribution meter or a value measured based on image analysis using an electron microscope such as SEM.
Further, the content of the positive electrode active material in the positive electrode layer is, for example, preferably in the range of 10% by mass to 99% by mass, and more preferably in the range of 20% by mass to 90% by mass.

ii) Solid electrolyte material The positive electrode layer in the present invention preferably contains a solid electrolyte material in addition to the positive electrode active material described above. This is because ion conductivity in the positive electrode layer is improved. The solid electrolyte material used in the present invention is not particularly limited as long as it has ionic conductivity and insulating properties, but a sulfide-based solid electrolyte material is particularly preferable. It is because it can be set as the winding type all-solid-state battery excellent in the output characteristic.

The sulfide-based solid electrolyte material used in the present invention is not particularly limited as long as it contains sulfur (S), has ionic conductivity, and has insulating properties. Here, when the wound type all-solid battery of the present invention is a wound type all-solid lithium battery, for example, Li ₂ S and Group 13 to Group 15 elements are used as the sulfide-based solid electrolyte material to be used. And a raw material composition containing the sulfide. Examples of a method for synthesizing a sulfide-based solid electrolyte material using such a raw material composition include an amorphization method. Examples of the amorphization method include a mechanical milling method and a melt quenching method, and among them, the mechanical milling method is preferable. This is because processing at room temperature is possible, and the manufacturing process can be simplified.

In addition, examples of the shape of the sulfide-based solid electrolyte material used in the present invention include a particle shape, and among them, a spherical shape or an elliptical shape is preferable.
When the sulfide-based solid electrolyte material is in the form of particles, the average particle diameter thereof is preferably in the range of 1 nm to 100 μm, and more preferably in the range of 0.1 μm to 50 μm. The average particle diameter may be a value calculated by a laser diffraction particle size distribution meter or a value measured based on image analysis using an electron microscope such as SEM.
Further, the content of the sulfide-based solid electrolyte material in the positive electrode layer is, for example, preferably in the range of 1% by mass to 90% by mass, and more preferably in the range of 10% by mass to 80% by mass.

iii) Positive electrode layer The positive electrode layer in the present invention may further contain a conductive material. By adding a conductive material, the conductivity of the positive electrode layer can be improved. The conductive material used in the present invention is not particularly limited as long as it has desired conductivity, and examples thereof include a conductive material made of a carbon material. Specific examples include acetylene black, ketjen black, and carbon fiber.
The positive electrode layer in the present invention may further contain a binder. By adding the binder, flexibility and flexibility can be imparted to the positive electrode layer. Examples of the binder used in the present invention include fluorine-containing resins such as polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE).
In addition, the thickness of the positive electrode layer in the present invention varies depending on the type of the intended wound all-solid battery, and is appropriately determined according to the purpose.

(B) Negative electrode layer The negative electrode layer in the present invention is a layer containing at least a negative electrode active material, and may contain at least one of a solid electrolyte material, a conductive material and a binder as necessary. . Especially, in this invention, it is preferable that a negative electrode layer contains sulfide type solid electrolyte material as a solid electrolyte material. It is because it can be set as the winding type all-solid-state battery excellent in the output characteristic.

Examples of the negative electrode active material used in the present invention include a metal active material and a carbon active material. Examples of the metal active material include In, Al, Si, and Sn. On the other hand, examples of the carbon active material include mesocarbon microbeads (MCMB), highly oriented graphite (HOPG), hard carbon, and soft carbon. Other examples of the negative electrode active material used in the present invention include lithium transition metal oxides such as Li ₄ Ti ₅ O ₁₂ and metal alloys such as La ₃ Ni ₂ Sn ₇ .

The shape of the negative electrode active material used in the present invention may be foil or particulate. When the shape of the negative electrode active material is in the form of particles, the average particle size is preferably in the range of 0.1 μm to 50 μm, for example. The average particle diameter may be a value calculated by a laser diffraction particle size distribution meter or a value measured based on image analysis using an electron microscope such as SEM.
Further, the content of the negative electrode active material in the negative electrode layer is, for example, preferably in the range of 10% by mass to 99% by mass, and more preferably in the range of 20% by mass to 90% by mass.

The solid electrolyte material, the conductive material and the binder used for the negative electrode layer in the present invention are the same as those described in the above “(a) positive electrode layer”, so description thereof is omitted here. .
Moreover, the thickness of the negative electrode layer varies depending on the type of the intended wound all-solid battery, and is appropriately determined according to the purpose.

(C) Solid electrolyte layer The solid electrolyte layer in the present invention is a layer formed between the positive electrode layer and the negative electrode layer. The solid electrolyte material used for the solid electrolyte layer is not particularly limited as long as it has ionic conductivity and insulating properties. Among them, a sulfide-based solid electrolyte material is preferable. It is because it can be set as the winding type all-solid-state battery excellent in the output characteristic. Furthermore, it is preferable that the content of the sulfide-based solid electrolyte material in the solid electrolyte layer is large, and it is particularly preferable that the solid electrolyte layer is composed only of the sulfide-based solid electrolyte material. It is because it can be set as the winding type all-solid-state battery which was more excellent in output characteristics. Since the solid electrolyte material used for the solid electrolyte layer is the same as the contents described in the above “(a) positive electrode layer”, description thereof is omitted here.
In addition, the thickness of the solid electrolyte layer in the present invention is, for example, preferably in the range of 0.1 μm to 1000 μm, and more preferably in the range of 0.1 μm to 300 μm.

(D) Other structure The battery element in this invention has at least the positive electrode layer, the negative electrode layer, and the solid electrolyte layer which were mentioned above. Furthermore, it usually has a positive electrode current collector that collects current from the positive electrode layer and a negative electrode current collector that collects current from the negative electrode layer. Examples of the material for the positive electrode current collector include SUS, aluminum, nickel, iron, titanium, and carbon. Among them, SUS and aluminum are preferable. On the other hand, examples of the material for the negative electrode current collector include SUS, copper, nickel, and carbon. Among them, SUS and copper are preferable.
In addition, the thickness and shape of the positive electrode current collector and the negative electrode current collector are preferably selected as appropriate according to the use of the wound all-solid battery.

(E) Battery Element The method for forming a battery element in the present invention is not particularly limited as long as a desired battery element can be obtained, and a method similar to a general battery element forming method may be used. it can. As an example of the method for forming the battery element, a material for forming the positive electrode active material layer, a material for forming the solid electrolyte layer, a method for sequentially pressing the material for forming the negative electrode active material layer, and the like can be given.

(2) Separator Next, the separator in the present invention will be described. The separator in the present invention is laminated on at least one of the positive electrode layer and the negative electrode layer of the battery element. In the present invention, since the battery element laminate includes a separator, a short circuit between the positive electrode layer and the negative electrode layer of the battery element can be prevented, and a highly safe wound all-solid battery can be obtained.

The separator in the present invention is not particularly limited as long as it has insulating properties, and examples thereof include porous films such as polyethylene and polypropylene; and nonwoven fabrics such as resin nonwoven fabric and glass fiber nonwoven fabric.
The thickness of the separator is determined in consideration of the degree of insulation, for example, depending on the material.

(3) Battery Element Laminate The method for forming the battery element laminate in the present invention is not particularly limited as long as a desired battery element laminate can be obtained. For example, the above “(1) Battery element” And a method of forming a battery element by the method described in the above and laminating a separator on the outside of the positive electrode layer of the battery element.

3. Winding type all solid state battery The winding type all solid state battery of the present invention has at least the core material and the battery element laminate. Furthermore, it usually has a battery case in which the core material and the battery element laminate are stored. As the battery case used in the present invention, a general wound type all-solid battery case can be used. Specifically, for example, a battery case made of SUS can be used.

  The wound type all-solid battery of the present invention may be a primary battery or a secondary battery, and among these, a secondary battery is preferable. This is because it can be charged and discharged repeatedly and is efficient. Moreover, as a use of the said winding type all-solid-state battery, it can use, for example as a vehicle-mounted battery.

  The method for producing the wound all-solid battery of the present invention is not particularly limited as long as it is a method capable of obtaining the above-described wound all-solid battery. A manufacturing method can be mentioned.

B. Next, a method for manufacturing a wound all-solid battery of the present invention will be described. The method for producing a wound type all-solid battery of the present invention includes a core material having a groove, a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and between the positive electrode layer and the negative electrode layer. A battery element laminate having a formed solid electrolyte layer and a separator, and a fitting step for fitting the end of the battery element laminate into the groove of the core material; and the battery element And a winding step of winding the laminated body on the core material.

  FIG. 4 is a schematic perspective view showing an example of a method for manufacturing a wound all-solid battery of the present invention. First, as shown to Fig.4 (a), the battery element laminated body 12 and the core material 13 are prepared, and the edge part of the battery element laminated body 12 is engage | inserted in the groove | channel 16 of the core material 13 (insertion process). Next, as shown in FIG. 4 (b), the battery element laminate 12 whose end is fixed in the groove 16 of the core material 13 is wound around the core material 13 (winding step), and the winding of the present invention is performed. A type all-solid battery is obtained.

Thus, according to the present invention, the end of the battery element laminate is fitted and fixed in the groove of the core material, and the battery element laminate is wound around the core material, thereby short-circuiting. Therefore, it is possible to obtain a wound all-solid battery that is difficult to form and has excellent shape maintainability.
Hereinafter, the manufacturing method of the winding type all-solid-state battery of this invention is demonstrated for every process.

1. Fitting process First, the fitting process of the present invention will be described. The fitting step in the present invention is a step of fitting in order to fix the end of the battery element laminate in the groove of the core material.

  In this step, a core material having a groove, a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, and A battery element laminate having a separator is prepared.

(1) Core material The core material in this invention has a groove | channel. The details of the core material are the same as the contents described in the above-mentioned “A. Winding type all-solid-state battery”, and thus description thereof is omitted here.

(2) Battery element laminate The battery element laminate in the present invention includes a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte formed between the positive electrode layer and the negative electrode layer. It has a layer and a separator. The details of the battery element laminate are the same as the contents described in “A. Winding-type all-solid-state battery”, and thus the description thereof is omitted here.

(3) Fixing method In this invention, the edge part of a battery element laminated body is inserted and fixed in the groove | channel of a core material. In the present invention, the method of fixing the end of the battery element laminate in the groove of the core material is the same as the content described in the above-mentioned “A. Is omitted.

2. Winding Step Next, the winding step of the present invention will be described. The winding process in this invention is a process of winding the said battery element laminated body to the said core material.

  The winding method of the battery element laminate in this step is particularly limited as long as the desired wound body can be obtained while the end of the battery element laminate is fixed in the groove of the core material. Instead, for example, a method of winding a battery element laminate on a core material using a general known winding machine can be exemplified.

  In the present invention, the number of windings of the battery element laminate on the core material is preferably selected as appropriate according to the use of the wound all-solid battery.

3. Other Steps In the present invention, in addition to the fitting step and the winding step, which are indispensable steps in the present invention, a wound body obtained by winding the battery element laminate on the core material is usually used as a battery case or the like. It has a battery assembly process and the like to be inserted into a battery.
Since these steps are the same as those in a general wound-type all-solid battery, description thereof is omitted here.

4). Winding type all-solid-state battery The usage of the winding type all-solid battery obtained by the present invention is the same as that described in the above-mentioned "A. .

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and exhibits the same function and effect. Are included in the technical scope.

  Hereinafter, the present invention will be described in more detail with reference to examples.

[Example 1]
First, Li ₂ S and _{P 2 S 5, Li 2 S} : P 2 S 5 = 70: 30 mixture to sulfide-based solid electrolyte material such that the (molar _{ratio) (Li 2 S-P 2} S 5 Material) was produced, and the solid electrolyte layer was formed by pressing the sulfide-based solid electrolyte material at a pressure of 1.0 ton / cm ² .
Next, LiCoO ₂ and Li ₂ S—P ₂ S ₅ materials are mixed so that LiCoO ₂ : Li ₂ S—P ₂ S ₅ material = 7: 3 (mass ratio) to produce a positive electrode mixture. The positive electrode layer was formed by pressing the positive electrode mixture at a pressure of 1.0 ton / cm ² .
Further, carbon graphite and _Li 2 _S-P 2 _{S 5} material, carbon _graphite: Li 2 _S-P 2 _{S 5} material = 1: 1 were mixed so that the mass ratio to prepare a negative electrode mixture member, A negative electrode layer was formed by pressing the negative electrode mixture at a pressure of 4.0 ton / cm ² .
Further, a polyethylene separator, a negative electrode layer, a solid electrolyte layer, and a positive electrode layer were laminated in this order, and the end of the obtained battery element laminate was fixed in the groove of the core material.
Using the battery element laminate and the core material, the wound body was formed by winding with a winding machine. Finally, the wound body was compressed with a press machine and stored in a battery case made of SUS to obtain a wound type all-solid battery.

[Comparative Example 1]
An electrode laminate was obtained in the same manner as in Example 1 except that the end of the battery element laminate was not fixed in the groove of the core material.

[Evaluation]
When a short-circuit generation test was performed using the wound type all solid state battery obtained in Example 1 and Comparative Example 1, the wound type all solid state battery obtained in Example 1 was less likely to cause a short circuit. Was confirmed.

DESCRIPTION OF SYMBOLS 1 ... Positive electrode layer 2 ... Negative electrode layer 3 ... Solid electrolyte layer 10 ... Battery element 11 ... Separator 12 ... Battery element laminated body 13 ... Core material 14 ... Winding body 15 ... Battery case 16 ... Groove 17 ... Inserting member 20 ... Winding Type all-solid-state battery

Claims (3)

A battery element in which a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer;
A battery type all-solid battery in which a battery element laminate having a separator laminated on at least one of a positive electrode layer and a negative electrode layer outside the battery element is wound around a core material having a groove. ,
An end of the battery element stack on the winding center side is fixed in a groove of the core material.   The wound all solid state battery according to claim 1, wherein the width of the groove of the core material is the same width as the film thickness of the battery element laminate. A battery element having a core material having a groove, a positive electrode layer containing a positive electrode active material, a negative electrode layer containing a negative electrode active material, a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, and a separator Prepare the laminate and
A fitting step for fitting in order to fix the end of the battery element laminate in the groove of the core material;
And a winding step of winding the battery element laminate on the core material.

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