JP4300605B2 - Non-aqueous electrolyte battery and manufacturing method thereof - Google Patents

Description

【００５７】
比較例１、２の結果より、深さ量３ｍｍ以上でＲを全て１ｍｍとしたサンプルでは深絞り、及びパッケージングで外装材が破断するという結果が得られた。
【００５８】
比較例４では５ｍｍの深絞りまで破断が発生せず、パッケージも良好であったが、実施例１と比較して外形寸法のばらつきが大きくなった。また、比較例５では深絞りによる破断がいくらか発生し、パッケージング後、全てコーナー部で破断した。
【００５９】
比較例３−１では、コーナー部に皺が発生するものがあった。
【００６０】
比較例３−２と比較例３−３では、パッケージ後全てコーナー部で皺が発生し、外形寸法も商品としての公差を満足できないレベルまで大きくばらついた。
【００６１】
以上テストの結果より、本発明による形状を有し、外装材として軟質アルミニウムの外側面にナイロン、内側面にＣＰＰ（キャストポリプロピレン）を設けたアルミ・ラミネートフィルムを用いた深絞り成形品は、深絞りの深さ２ｍｍの場合、深絞り成形をしない外装材に比較して、皺の発生が無い状態で、良好な外形寸法を実現することが可能であることが証明された。またその外形寸法は、特に容積の制約がある電池の外装材として、最も効率の高いレベルであることも証明された。
【００６２】
【発明の効果】
以上の説明からも明らかなように、本発明により得られる非水電解質電池は、外観に皺が無く、内部空間が必要最小限であるため単位体積当たりの容量が大きく、外径寸法のバラツキが少なく、端子も厚み方向で片側に寄せることができるので電池装着時に機器側の余分なスペースも最小限となる。
【図面の簡単な説明】
【図１】本発明が適用される固体電解質電池の一構成例を示す分解斜視図である。
【図２】本発明が適用される固体電解質電池の一構成例を示す概略斜視図である。
【図３】ポンチとダイスによる深絞り成形の様子を示す模式図である。
【図４】深絞り成形状態を示す概略断面図である。
【符号の説明】
１ 素電池、２ 外装材、３ 負極端子リード、４ 正極端子リード、５ ポンチ、６ ダイス[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nonaqueous electrolyte battery in which a unit cell is accommodated in an exterior material made of a laminate film, and further relates to a method for manufacturing the same.
[0002]
[Prior art]
In recent years, electronic devices such as mobile phones and notebook computers have become cordless and portable, and thin, small, and lightweight portable electronic devices have been developed one after another. In addition, the amount of power used has increased due to diversification of devices, and there has been an increasing demand for higher capacities of batteries, particularly secondary batteries, which are energy sources for these electronic devices.
[0003]
Secondary batteries that have been used conventionally include lead-acid batteries and nickel-cadmium batteries, and nickel-hydrogen batteries and lithium-ion batteries have been put to practical use as new secondary batteries. However, since these secondary batteries use liquid as an electrolyte, there is a problem of leakage from the battery.
[0004]
Therefore, a polymer lithium ion secondary battery using a polymer gel swollen by an electrolytic solution as an electrolyte has been developed to solve such problems. With the development of this polymer lithium ion secondary battery, there is no risk of liquid leakage from the battery, and a secondary battery that is small, light, thin, and has a high energy density can be realized.
[0005]
The configuration of the polymer lithium ion secondary battery will be described. For example, an active material made of LiCoO ₂ and graphite is laminated on a positive electrode current collector made of an aluminum thin plate, and carbon is placed on the negative electrode current collector made of a copper thin plate. , Coke, graphite and other active materials are laminated to form an electrode. A separator, which is a thin film having pores, is sandwiched between polypropylene, polyethylene, and the like, and between these electrodes and separators, such as polyacrylonitrile (PAN), polyethylene oxide (PEO), and polyvinylidene fluoride (PVDF). It has a sandwich structure filled with various polymer gel electrolytes.
[0006]
These unit cells (unit cells) in a sandwich structure are packaged with a packaging material composed of a soft metal film such as aluminum foil and a plastic film such as nylon, polyethylene, polypropylene, and polyethylene terephthalate as a container for encapsulation. The
[0007]
[Problems to be solved by the invention]
By the way, a polymer battery using an ion conductive polymer is rolled up with a long positive electrode plate with terminals and a negative electrode plate with terminals to make flat and thick battery elements, and heat seal like an aluminum laminate pack. When trying to enclose in a type of exterior material, conventionally, the sheet-shaped exterior material is folded in half, and the other 3 sides are heat-sealed in vacuum and sealed so that one side of the battery element hits the crease between them. In addition, a method is adopted in which the battery is configured such that the positive and negative electrode terminals come out of the exterior material.
[0008]
However, in the configuration as described above, if the fusion margin of the three sides to be thermally fused is too close to the battery element, wrinkles are generated at the corners of two adjacent sides depending on the thickness of the battery element, and thermal fusion is not possible. It has become complete.
[0009]
On the other hand, if the gap is sufficiently provided between the element and the fusion allowance, there is a problem that the outer dimension of the battery itself becomes unnecessarily large.
[0010]
Therefore, there is an attempt to form such an exterior material using a punch and a die to obtain a volume in which the battery element can be accommodated, but usually the molding surface has a large taper. It cannot be said that the shape fits tightly. Rather, the space formed by the taper is heat-sealed in a vacuum, and then pressed against the atmospheric pressure to cause shrinkage defects in the outer shape of the battery.
[0011]
In addition, the aluminum laminate pack has a resin that is resistant to the corrosive substances contained in the battery element attached inside. However, such a material has poor stretchability, and when it is molded as described above, the interface with aluminum easily peels off, and the corrosive substance of the battery element causes a chemical reaction with aluminum to cause cracking due to corrosion. There arises a problem that long-term stability as an exterior material cannot be maintained.
[0012]
Also, not only for aluminum laminate packs, but in the processing of materials that generally involve plastic deformation, it is common to apply a lubricant with the expectation of smooth slipping between the punch, the die, and the wrinkle control and the material. However, if oil remains in the outer packaging material of the battery element, this causes an electrochemical reaction, which causes the battery to swell or rupture. Further, even a small amount of remaining oil deteriorates the peel strength on the heat seal surface and hinders complete sealing, so that the oil used for lubrication must be completely removed. However, after molding, removing the oil while maintaining the form of the exterior material has a risk of material deformation when using a wiping method, and with a cleaning method using an organic solvent, there is a risk of resin dissolution, Since an expensive drying process is involved, a molding method using as little lubricant as possible is desired.
[0013]
The present invention has been proposed in view of the above-described conventional circumstances, and even if the heat-sealing allowance by heat sealing is sufficiently close, complete heat-sealing can be performed without any problem, and external dimensions are required. It aims at providing the nonaqueous electrolyte battery which can be made small to the minimum, and also aims at providing the manufacturing method.
[0014]
[Means for Solving the Problems]
In order to achieve the above-described object, the nonaqueous electrolyte battery of the present invention is a nonaqueous electrolyte battery in which a battery element is housed in an exterior material made of a laminate film. The exterior material is made of nylon, aluminum, and cast polypropylene. The structure is laminated in order, cast polypropylene is on the battery element side, rectangular deep drawing is performed so that the deep drawing amount T is 2 mm, and a space for accommodating the battery element is formed, On the inner surface of the deep-drawn exterior material, the radius of curvature of the ridge corresponding to two sides of one set of two sides parallel to each other is 1 mm, and the rising angle θ of each side portion Is set to 85 ° to 90 °.
[0015]
The manufacturing method of the present invention, deep-drawn by the exterior material made of a laminate film, the manufacturing method of the nonaqueous electrolyte battery is sealed by housing the battery element in the space thus formed, nylon, aluminum and a cast polypropylene upon performing rectangular deep drawing Ategai the punch and die in the outer package made of laminated films and the laminated structure sequentially, 2 mm or less the radius of curvature of the corners of the punch, parallel to each other 2 The curvature radius of the ridge corresponding to the two sides of one set of the sides of the set is set to 1 mm , the rising angle θ of each side portion is set to 85 ° to 90 °, and cast polypropylene is on the battery element side. It is characterized by performing a rectangular deep drawing with a deep drawing amount T of 2 mm .
[0016]
With the above settings, good deep drawing can be performed without using a lubricant, and the outer dimensions of the battery can be reduced to the minimum necessary. In addition, no wrinkles occur during sealing or the like.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of a nonaqueous electrolyte battery to which the present invention is applied will be described with reference to the drawings.
[0018]
The nonaqueous electrolyte battery of the present invention is, for example, a solid electrolyte battery or a gel electrolyte battery. As shown in FIGS. 1 and 2, the solid electrolyte or gel is interposed between the positive electrode active material layer and the negative electrode active material layer. The battery element 1 provided with the electrolyte electrolyte is accommodated in an exterior material 2 made of a laminate film, and the periphery is sealed by heat welding.
[0019]
The unit cell 1 is provided with a negative terminal lead 3 electrically connected to the negative electrode constituting the battery element 1 and a positive terminal lead 4 electrically connected to the positive electrode. The positive terminal lead 4 is drawn out of the exterior material 2.
[0020]
The exterior material 2 used in the present invention has a structure in which a plastic film is bonded to a soft metal thin film, and the plastic film is intended to be sealed by thermal fusion when the battery element 1 is sealed. Polyethylene, polypropylene, polyethylene terephthalate, and the like are used, and any raw material may be used as long as it is a thermoplastic plastic material. Further, the plastic film may be bonded to only one side or both sides of the soft metal thin film. The thickness of the soft metal thin film is 20 to 100 μm.
[0021]
The exterior material 2 is subjected to rectangular deep drawing, which will be described below. In the following description, the shape of the punch used at the time of molding will be mainly described. However, the shape of this punch is reflected in the inner surface shape of the exterior material 2, and the radius of curvature thereof is determined.
[0022]
The heat seal type exterior material 2 according to the present invention is provided with an overhanging portion having a size enough to accommodate the battery element 1 in advance by a deep drawing process, and the shape of the overhanging portion is unique utilizing the characteristics of the shape of the battery element 1. Having the shape solves the above problem.
[0023]
More specifically, as shown in FIG. 3 and FIG. 4, the thickness of the battery element 1 is deep-drawn using a heat seal type exterior material 2 in which a soft material is laminated with a resin. At this time, one side of the deep-drawn depression is valley-folded, and two sides of the remaining three sides that are parallel to the valley fold line have predetermined dimensions on the punch 5 side and the die 6 side. The clearance between the punch 5 protruding from the strip 7 and the die 6 is set to a deep drawing angle of 85 ° to 90 °.
[0024]
Further, the ridge including two sides parallel to the valley fold line has a curvature R ₃ corresponding to half of the thickness of the battery element 1 (that is, the deep drawing amount T) on the punch side, following the shape of the battery element 1. provided deep drawing is Ru is molded. The clearance is set so that the deep drawing angle is 90 ° or less.
[0025]
Further, the corner where the two sides of the punch intersect is set to a curvature R ₁ = 2 mm or less in a three-dimensional shape, and the corner R where the two sides on the die side intersect is also set to a curvature R _{2 of the} three-dimensional shape.
[0026]
The depth at which deep drawing can be effectively performed under these conditions is 5 mm or less, and in particular, by setting the depth to 2 mm, there is almost no variation in external dimensions , and there is no need to use an oil lubricant or the like in deep drawing, and molding. The present inventors have found a condition in which the inner surface of the outer packaging material is not particularly peeled off from the corrosion-resistant resin and aluminum.
[0027]
Usually, in deep drawing using an aluminum laminate material, the larger the amount of deep drawing and the smaller the curvature of the punch, the more the material breaks and breaks during molding. In particular, there are many cases in which holes are formed at the corners and peeling of the inner resin occurs, resulting in material breakage or an unsuitable finish as a battery exterior material.
[0028]
However, in the deep-drawn molded product made according to the dimensional relationship of the present invention, a three-dimensional curvature R ₁ is set at the corner portion, and two opposite sides R of the four sides have a curvature R less than half of the deep drawing amount T. By stipulating ₃ , the plastic deformation of the material of the corner portion is smoothed even at a deep drawing angle of approximately 85 ° to 90 °, and the drawing depth is 2 mm or more that can be broken by normal experience. However, plastic deformation proceeds in a state where there is no material fracture. Further, by setting the drawing depth to about 2 mm, there is almost no variation in the external dimensions after housing the battery element as compared with the case of a deeper drawing depth. This is due to the result of devising the R dimension of the four sides of the punch and the R dimension of the corner part.
[0029]
On the other hand, when the battery element 1 is a solid electrolyte battery or a gel electrolyte battery, for example, silicon gel, acrylic gel, acrylonitrile gel, polyphosphazene are used as the polymer material used for the polymer solid electrolyte. Modified polymers, polyethylene oxides, polypropylene oxides, and their composite polymers, cross-linked polymers, modified polymers, etc. or fluoropolymers such as poly (vinylidene fluoride), poly (vinylidene fluoride-co-hexafluoropropylene), poly ( Various types of vinylidene fluoride-co-tetrafluoroethylene), poly (vinylidene fluoride-co-trifluoroethylene), and the like can be used, but of course, the present invention is not limited thereto.
[0030]
For the solid electrolyte or gel electrolyte laminated on the positive electrode active material layer or the negative electrode active material layer, a solution comprising a polymer compound, an electrolyte salt, and a solvent (or a plasticizer in the case of a gel electrolyte) is used as the positive electrode active material. A layer or a negative electrode active material layer is impregnated, and the solvent is removed and solidified. Part of the solid electrolyte or the gel electrolyte laminated on the positive electrode active material layer or the negative electrode active material layer is impregnated into the positive electrode active material layer or the negative electrode active material layer to be solidified. In the case of a crosslinked system, it is then solidified by crosslinking with light or heat.
[0031]
The gel electrolyte is composed of a plasticizer containing a lithium salt and a matrix polymer of 2 wt% to 30 wt%. At this time, esters, ethers, carbonates and the like can be used alone or as one component of a plasticizer.
[0032]
In preparing the gel electrolyte, various polymers used to form the gel electrolyte can be used as the matrix polymer for gelling such carbonates. From the viewpoint of redox stability, For example, it is desirable to use a fluorine-based polymer such as poly (vinylidene fluoride) or poly (vinylidene fluoride-co-hexafluoropropylene).
[0033]
The polymer solid electrolyte is composed of a lithium salt and a polymer compound that dissolves the lithium salt. Examples of the polymer compound include ether polymers such as poly (ethylene oxide) and cross-linked polymers, poly (methacrylate) esters, and acrylates. Fluorine polymers such as poly (vinylidene fluoride) and poly (vinylidene fluoride-co-hexafluoropropylene) can be used singly or in combination. For example, poly (vinylidene) can be used because of redox stability. Fluoropolymers such as (fluoride) and poly (vinylidene fluoride-co-hexafluoropropylene) are preferably used.
[0034]
As a lithium salt to be contained in such a gel electrolyte or a polymer solid electrolyte, a lithium salt used in a normal battery electrolyte can be used. Examples of the lithium compound (salt) include the following. However, it is not limited to these.
[0035]
For example, lithium chloride lithium bromide, lithium iodide, lithium chlorate, lithium perchlorate, lithium bromate, lithium iodate, lithium nitrate, lithium tetrafluoroborate, lithium hexafluorophosphate, lithium acetate, bis (trifluoromethane Examples thereof include sulfonyl) imidolithium, LiAsF ₆ , LiCF ₃ SO ₃ , LiC (SO ₂ CF ₃ ) ₃ , LiAlCl ₄ , and LiSiF ₆ .
[0036]
These lithium compounds may be used alone or in combination, and among them, LiPF ₆ and LiBF ₄ are desirable from the viewpoint of oxidation stability.
[0037]
As a concentration for dissolving the lithium salt, a gel electrolyte can be used at 0.1 to 3.0 mol in the plasticizer, but preferably 0.5 to 2.0 mol / liter.
[0038]
The battery of the present invention can be configured in the same manner as a conventional lithium ion battery except that the gel electrolyte or solid electrolyte as described above is used.
[0039]
That is, as a negative electrode material for constituting a lithium ion battery, a material capable of doping and dedoping lithium can be used. A constituent material of such a negative electrode, for example, a non-graphitizable carbon material or a carbon material such as a graphite material can be used. More specifically, pyrolytic carbons, cokes (pitch coke, needle coke, petroleum coke), graphites, glassy carbons, organic polymer compound fired bodies (phenol resin, furan resin, etc.) at an appropriate temperature. Carbon materials such as those obtained by firing and carbonization), carbon fibers, activated carbon, and the like can be used. In addition, as a material capable of doping and dedoping lithium, a polymer such as polyacetylene or polypyrrole or an oxide such as SnO ₂ can be used. In forming the negative electrode from such a material, a known binder or the like can be added.
[0040]
The positive electrode can be configured using a metal oxide, a metal sulfide, or a specific polymer as the positive electrode active material, depending on the type of the target battery. For example, in the case of constituting a lithium ion battery, the positive electrode active material may be a metal sulfide or oxide not containing lithium, such as TiS ₂ , MoS ₂ , NbSe ₂ , V ₂ O ₅ , LiMO ₂ (wherein M is one kind) The above transition metals are represented, and x varies depending on the charge / discharge state of the battery and is usually 0.05 or more and 1.10 or less. As the transition metal M constituting this lithium composite oxide, Co, Ni, Mn and the like are preferable. Specific examples of such a lithium composite oxide include LiCoO ₂ , LiNiO ₂ , LiNi _y Co _1-y O ₂ (where 0 <y <1), LiMn ₂ O _{4 and the} like. . These lithium composite oxides can generate a high voltage and become a positive electrode active material excellent in energy density. A plurality of these positive electrode active materials may be used in combination for the positive electrode. Moreover, when forming a positive electrode using the above positive electrode active material, a well-known electrically conductive agent, a binder, etc. can be added.
[0041]
Examples of the structure of the battery element 1 include a stacking type, a winding type, a folding type, and the like, which can be arbitrarily selected. A take-up type in which is a circular arc is preferable.
[0042]
【Example】
Next, specific examples and comparative examples to which the present invention is applied will be described based on experimental results.
[0043]
Actually, in order to explain the effect of the present invention, exterior materials in the following examples and comparative examples were prepared, and aluminum mock-ups having the same external dimensions as battery elements were prepared as test contents. did.
[0044]
The dimensions are 52 mm in length and 33 mm in width. The thickness is 2 mm, 5 mm, and 6 mm. Each of the four sides of 52 mm in length is half the thickness, and the four sides of 33 mm in width are chamfered (substantially C0 .2 mm).
[0045]
Using this mock-up, a packaging test by heat fusion in a vacuum was performed in the same way as an actual battery. The fusion allowance at this time was all 5 mm.
[0046]
Example 1
An aluminum laminate film of 25 μm nylon, 40 μm soft aluminum, and 30 μm CPP (cast polypropylene) was used as a laminate exterior material using a soft material, and the CPP was molded so as to be on the battery element side.
[0047]
The dimensions of deep drawing, vertical 53 mm, lateral 33 mm, and depth 2 mm, 2 mm and R of the corner portion, all four sides of R was 1 mm.
[0048]
An example sample 1 was prepared under these dimensions and the deep drawing conditions defined in the claims.
[0049]
Comparative Example 4
A comparative sample 4 was prepared in which the same material and vertical and horizontal dimensions, depth of 5 mm, vertical 53 mm R were 2.5 mm, horizontal 33 mm R was 1 mm, and corner corner R was 2 mm.
[0050]
Comparative Example 5
A comparative sample 5 was prepared in which the same material and vertical and horizontal dimensions, depth of 6 mm, vertical 53 mm R were 3.0 mm, horizontal 33 mm R was 1 mm, and corner R was 2 mm.
[0051]
Comparative Example 1
A comparative example sample 1 was prepared in which the same materials and vertical and horizontal dimensions as in Example 1 were used, the depth was 3 mm, the vertical and horizontal R were all 1 mm, and the corner R was 2 mm.
[0052]
Comparative Example 2
A comparative sample 2 was prepared in which the same material and vertical and horizontal dimensions as in Example 1 were used, the depth was 5 mm, the vertical and horizontal R were all 1 mm, and the corner R was 2 mm.
[0053]
Comparative Examples 3-1, 3-2, 3-3
Samples 3-1, 3-2, and 3-3 of mock-up T2mm, 5mm, and 6mm that are prepared in Examples 1, 2, and 3 are prepared using the same aluminum laminate film as in the examples without deep drawing. Created.
[0054]
The number of test samples was 20 each, and the problems that occurred in the deep drawing process, the problems that occurred in the packaging, and the variations in the finished external dimensions were summarized in Table 1 below.
[0056]
[Table 1]

[0057]
From the results of Comparative Examples 1 and 2, in the sample in which the depth amount was 3 mm or more and R was all 1 mm, the result was that the exterior material was broken by deep drawing and packaging.
[0058]
In Comparative Example 4, breakage did not occur up to 5 mm deep drawing, and the package was good, but the variation in outer dimensions was larger than that in Example 1. Further, in Comparative Example 5 , some rupture due to deep drawing occurred, and after packaging, all ruptured at the corners.
[0059]
In Comparative Example 3-1, there was a case where wrinkles occurred at the corner.
[0060]
In Comparative Example 3-2 and Comparative Example 3-3, wrinkles occurred at all corners after packaging, and the outer dimensions greatly varied to a level that could not satisfy the tolerance as a product.
[0061]
From the above test results, have a shape according to the present invention, nylon on the outer surface of the soft aluminum as an exterior material, deep drawing molded article using an aluminum-laminated film having a CPP (cast polypropylene) on the inner surface, the depth In the case of a drawing depth of 2 mm , it has been proved that it is possible to realize a good external dimension in a state where no wrinkles are generated as compared with an exterior material that is not subjected to deep drawing. In addition, it has been proved that the outer dimensions are the most efficient level as a battery outer packaging material having a volume limitation.
[0062]
【The invention's effect】
As is clear from the above description, the nonaqueous electrolyte battery obtained by the present invention has no flaws in the appearance and the internal space is the minimum necessary, so the capacity per unit volume is large and the variation in the outer diameter size is large. Since there are few terminals and the terminal can be moved to one side in the thickness direction, the extra space on the device side is minimized when the battery is mounted.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a configuration example of a solid electrolyte battery to which the present invention is applied.
FIG. 2 is a schematic perspective view showing a configuration example of a solid electrolyte battery to which the present invention is applied.
FIG. 3 is a schematic view showing a state of deep drawing using a punch and a die.
FIG. 4 is a schematic sectional view showing a deep drawing state.
[Explanation of symbols]
1 unit cell, 2 exterior material, 3 negative terminal lead, 4 positive terminal lead, 5 punch, 6 dice

Claims (7)

In a non-aqueous electrolyte battery in which a battery element is housed in an exterior material made of a laminate film,
The exterior material has a structure in which nylon, aluminum, and cast polypropylene are sequentially bonded, and the cast polypropylene is on the battery element side, and is subjected to rectangular deep drawing so that the deep drawing amount T is 2 mm. A space for accommodating the element is formed,
On the inner surface of the deep-drawn exterior material, the radius of curvature of the ridge corresponding to two sides of one set of the two sets of sides parallel to each other is 1 mm, and the rising angle θ of each side portion is A nonaqueous electrolyte battery characterized by being set to 85 ° to 90 °. The non-aqueous electrolyte battery according to claim 1, wherein the exterior material is made of the aluminum , the nylon, and the cast polypropylene , and the aluminum has a thickness of 20 to 100 μm. The electrolyte constituting the battery element includes a matrix polymer containing any of poly (vinylidene fluoride) and poly (vinylidene fluoride-co-hexafluoropropylene) and a lithium salt of LiPF ₆ or LiBF _4. The nonaqueous electrolyte battery according to claim 1, which is a gel electrolyte or a solid electrolyte.   2. The nonaqueous electrolyte battery according to claim 1, wherein the negative electrode constituting the battery element is a negative electrode containing a material capable of doping and dedoping lithium.   5. The nonaqueous electrolyte battery according to claim 4, wherein the material capable of doping and dedoping lithium is a carbon material.   The nonaqueous electrolyte battery according to claim 1, wherein the positive electrode constituting the battery element is a positive electrode containing a composite oxide of lithium and a transition metal. In the manufacturing method of a non-aqueous electrolyte battery that performs deep drawing on an exterior material made of a laminate film, and houses and seals battery elements in the space formed thereby,
When performing rectangular deep drawing molding by applying punches and dies to an exterior material made of a laminate film made of nylon, aluminum and cast polypropylene laminated in order,
The radius of curvature of the corner of the punch is 2 mm or less, the radius of curvature of the ridge corresponding to two sides of one set of two sets of parallel sides is 1 mm, and the rising angle θ of each side is 85 ° to 90 °. A method for producing a non-aqueous electrolyte battery, characterized in that a rectangular deep drawing with a deep drawing amount T of 2 mm is performed such that cast polypropylene is on the battery element side.

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