JP3632062B2 - Thin polymer battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thin polymer battery, and more particularly, to an outer structure of a thin battery, that is, a structure of an outer covering material (outer covering material).
[0002]
[Prior art]
The development of the electronics field in recent years is remarkable, and the demand for downsizing, weight reduction, and high performance of electronic devices is remarkable. For a battery called the heart of an electronic device, development of a battery having a large energy density per unit volume or unit weight and having a long life is desired. Under such circumstances, the application of lithium ion secondary batteries to mobile phones, small OA devices, small communication devices and the like is expected.
[0003]
Conventionally, various types of primary batteries or secondary batteries for power supply are mounted on small electronic devices such as handy-type video cameras, cordless phones, and mobile phones. When a secondary battery that can be recharged and used repeatedly is mounted on these electronic devices, etc., one or more secondary batteries are placed in a single case in order to facilitate attachment / detachment to / from the electronic device or charger. The battery device stored in is used.
The battery device (not shown) includes, for example, a battery container made of a plastic material or the like and formed in a generally rectangular shape, and one or a plurality of rechargeable secondary batteries housed in the battery container. It is made up of.
[0004]
Such a battery device has an anode terminal and a cathode terminal for mounting on an electronic device or the like, a charging device, and the like, and is stored in a secondary battery when mounted on an electronic device or the like. Electric power is supplied from an anode terminal and a cathode terminal to an electronic device or the like.
As shown in FIG. 10, the secondary battery is formed by packing positive electrode plates 11 and negative electrode plates 12 with separators 13 and alternately superposing them.
[0005]
Then, the laminate composed of the positive electrode plate 11, the negative electrode plate 12, and the bag-like separator 13 is inserted into a generally rectangular battery case (not shown), and an electrolyte solution is injected therein, or a polymer solid electrolyte is previously provided. After the gel electrolyte is formed between the positive electrode plate 11 and the negative electrode plate 12, it is inserted into a battery case to function as a secondary battery. The current is taken out at the positive terminal 14a and the negative terminal 14b.
For example, as shown in FIG. 11, the positive electrode plate 11 has a composite oxide of lithium and transition metal such as LiV ₂ O ₅ , LiCoO ₂ , and the like on both sides of a current collector 21 made of an aluminum foil having a rectangular shape and a thickness of about 20 μm. LiNiO ₂ , LiMn ₂ O ₄ or the like is applied as the positive electrode active material 22 and dried.
[0006]
On the other hand, the negative electrode plate 12 is made of, for example, carbon that can be doped / undoped with lithium ions, such as carbon having a graphite structure or soft, on both sides of a current collector 23 made of a copper foil having a rectangular shape of about 10 μm as shown in FIG. Carbon such as graphitized carbon material is applied and dried as the negative electrode active material 24. For the separator 13, for example, a porous polyethylene film or a porous polypropylene film having a thickness of about 25 μm is used in a bag shape.
[0007]
In FIG. 11, as the electrolyte 25, for example, a nonaqueous electrolytic solution in which LiPF ₆ is dissolved in a mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC), or LiBF ₄ or LiN (CF ₃ SO ₂ ) in the solvent. A non-aqueous electrolyte solution in which ₂ is dissolved is used, or a polymer gel electrolyte obtained by gelling them is used.
A combination of positive electrode plate 11 / electrolyte 25 / separator 13 / electrolyte 25 / negative electrode plate 12 as shown in FIG. 11 is called a battery power generation element.
[0008]
As mentioned at the beginning, in recent years, battery power sources are increasingly required to have high energy density per weight, high energy density per volume, long life, and high reliability. Thin batteries have been proposed. Conventionally, in order to reduce the thickness of thin batteries as much as possible, a flat power generating element is externally liquid-tight and air-tightly covered with a laminate film (covering material) having a metal foil and a heat-sealing resin film. When a battery power generation element using a non-aqueous electrolyte is externally mounted, performance deterioration and safety deterioration due to the ingress of moisture, oxygen, nitrogen in the outside air to the power generation element, or leakage of the electrolyte to the outside air is large. Therefore, many proposals have been made.
[0009]
FIG. 12 is a cross-sectional view showing a conventional flat-type thin battery exterior structure (exterior example using a laminate film), and FIG. 13 is a cross-sectional view showing a laminated structure of an envelope material. In this thin battery, an ionomer film 2 is laminated on the back surface of a stainless steel substrate 1, and a conductive glass substrate 3 and a power generation element are placed on the ionomer film 2 via a positive lead body 9. An aluminum foil laminate film 7 is coated on the power generation element via a negative electrode side lead body 8. The power generation element includes a positive electrode 4, a solid electrolyte 5, and a negative electrode 6.
[0010]
As shown in FIG. 13, the aluminum foil laminate film 7 is obtained by laminating an ionomer film 7b as a heat-fusible resin film on the inner surface of an aluminum foil 7a and laminating a polyester film 7c as a protective film for the aluminum foil 7a on the outer surface. (Japanese Patent Laid-Open No. 60-211762).
[0011]
Thus, in the thin battery of FIG. 12, a polyester heat-sealing film is laminated on the back surface of the functional element substrate, and after placing the battery power generation element, the inner surface is covered with the ionomer heat-sealing resin film. The heat-sealing film laminated on the metal foil and the heat-fusible resin film of the metal foil laminate film are heat-sealed and sealed.
[0012]
[Problems to be solved by the invention]
However, the thin battery disclosed in Japanese Patent Application Laid-Open No. 60-211762 has a drawback of short-circuiting even if the fusion part is securely fused. In other words, when pinholes occur in the heat-sealable resin film on the inner surface, there is a drawback that an electrical short circuit occurs between the metal foil and the current collector or terminal, and in the worst case, it ignites. there were. In addition, when the enveloping material is heat-sealed, there is a drawback that the terminal comes into contact with the metal foil at the seal edge portion and short-circuits.
The present invention has been made in view of such problems.
[0013]
The present inventor considered that another film may be interposed between the metal foil and the heat-fusible resin film in order to eliminate the short circuit. Therefore, when a nylon or ethylene-vinyl alcohol polymer was interposed, the battery life decreased. Such a result is attributed to the hygroscopicity of nylon and ethylene-vinyl alcohol polymer, and therefore it has been found that these films cannot be used in lithium batteries that dislike moisture.
[0014]
By the way, it is known that polyester (polyester-based heat-fusible resin) has no hygroscopic property and is excellent in solvent resistance against a solvent used in an electrolyte. However, since polyester has poor adhesion to a metal foil, an adhesive must be interposed at the interface between the polyester film and the metal foil. However, it is generally known that polyester swells with a non-aqueous electrolyte, and even though the electrolyte of a thin polymer battery is a liquid or gel, an electrolyte component is present, so that an adhesive is interposed between them. There was a risk of peeling.
[0015]
Accordingly, an object of the present invention is to provide a thin polymer battery, even when pinholes are generated in the heat-resistant resin film on the outer side of the metal foil of the outer packaging material, the metal foil is exposed to the outside air to cause a short circuit with the terminal or the outside air. Can prevent the short circuit between the metal foil and the current collector even when the inner element of the battery does not enter and there is a pinhole in the inner heat-fusible resin. At the same time, it is an object of the present invention to provide an outer covering material that is prevented from being affected by the electrolytic solution components of the liquid and gel electrolyte.
[0016]
[Means for Solving the Problems]
In the present invention, two outer enveloping materials, one outer enveloping material folded in two, or one outer enveloping material folded in two in a bag shape, each sandwiching the battery internal element in a thin polymer battery was sealed by bonding together the outer encapsulant around the outer dressings, for example, as shown in FIG. 7, the outer encapsulant has a protective layer, an adhesive layer, a barrier metal layer, the adhesive The adhesive layer, the short prevention layer, and the adhesion layer are laminated in this order . In particular, the adhesion layer is a two-layer structure in which linear low density polyethylene (LLDPE) and ionomer are sequentially laminated from the short prevention layer side. It shall consist of
[0017]
That is, the envelope material 31 shown in (1) is a protective layer 41 for maintaining strength from the outside, (2) the barrier metal layer 43 of the underlying metal foil, and (3) the protective layer 41 and the barrier metal layer 43. Adhesive layer 42a (outside adhesive layer) for improving adhesiveness , (4) short prevention layer 44 inside barrier metal layer 43, (5) improvement in adhesion between barrier metal layer 43 and short prevention layer 44 And (6) an adhesion layer inside the short prevention layer 44 for improving the electrolytic solution resistance.
[0018]
Moreover, in the said envelope material 31, as shown, for example in FIG.
(1) The protective layer 41 is made of a polyethylene terephthalate film (51) which is a heat resistant resin film.
(2) The adhesive layers 42a and 42b are ionomer films (52, 54) which are heat-fusible resin films.
(3) The barrier metal layer 43 is made of aluminum foil 53.
(4) The short prevention layer 44 is formed of a polyethylene terephthalate film (55).
[0019]
The adhesion layer (see FIGS. 7 and 8) has a two-layer structure including a first adhesion layer 45 and a second adhesion layer 46, for example. The first adhesion layer 45 is a linear low density polyethylene (LLDPE) 56 having good adhesion to the short-circuit prevention layer 44 made of polyethylene terephthalate 51 and good resistance to electrolyte, and the second adhesion layer 46 is made of LLDPE. The ionomer 57 has good adhesion and resistance to electrolyte solution and good adhesion to the terminal metal. As described above, the outer covering material 31 shown in FIG. 7 has a laminated structure including seven layers, for example, a protective layer 41 (outermost layer) to a second adhesion layer 46 (innermost layer).
[0020]
That is, in the polymer battery according to claim 1 (see FIGS. 2, 7 and 11), the positive electrode plate 11 and the negative electrode plate 12 are alternately opposed to each other through the electrolyte layer 25 and the separator 13 which may be omitted. In the battery configured by sandwiching the stacked battery internal elements with the outer envelope material 31 and fusing the outer envelope materials around the outer envelope material 31 to seal the internal battery elements, The packaging material 31 includes a protective layer 41, an adhesive layer 42 a, a barrier metal layer 43, an adhesive layer 42 b, a short prevention layer 44, an adhesion layer ( linear low density polyethylene (LLDPE) layer and ionomer layer) from the outer layer side. It is characterized by being in the form of stacking in this order.
[0021]
The polymer battery according to claim 2 is the polymer battery according to claim 1, wherein the battery internal element is sandwiched between two outer enveloping materials, and the outer enveloping material is fused around the outer enveloping material. It is sealed.
[0022]
A polymer battery according to a third aspect is the polymer battery according to the first aspect, wherein the inner battery element is sandwiched between two outer enveloping materials and the outer enveloping materials are fused together at three sides of the outer enveloping material. The battery internal element is sealed.
[0023]
The polymer battery according to claim 4 is characterized in that, in claim 2 or 3, the protective layer is a heat resistant film.
[0024]
The polymer battery according to claim 5 is characterized in that, in claim 4, the heat-resistant film of the protective layer is a polyethylene terephthalate film.
[0025]
The polymer battery according to claim 6 is characterized in that the adhesive layer between the protective layer and the barrier metal layer is an ionomer in claim 2 or 3.
[0026]
A polymer battery according to a seventh aspect is characterized in that the barrier metal layer is an aluminum foil in the first aspect.
[0027]
The polymer battery according to an eighth aspect is characterized in that the adhesive layer between the barrier metal layer and the short-circuit preventing layer is an ionomer in the second or third aspect.
[0028]
The polymer battery according to claim 9 is the polymer battery according to claim 2 or 3, wherein the short prevention layer is a heat resistant film.
[0029]
The polymer battery according to claim 10 is characterized in that, in claim 9, the heat-resistant film of the short prevention layer is a polyethylene terephthalate film.
[0030]
As described above, the polymer battery of the present invention is characterized in that the adhesion layer has two layers.
[0031]
As described above, the polymer battery of the present invention is characterized in that the adhesion layer is composed of two layers of linear low density polyethylene (LLDPE) and ionomer.
[0032]
A polymer battery according to an eleventh aspect of the present invention is the polymer battery according to the first aspect, in which the battery inner element is a single outer cover that is fused and folded into a cylindrical shape between the outermost surface and the innermost surface of the outer envelope material. The battery is characterized in that it is sandwiched between the packaging materials, and the outer packaging materials are fused together at two sides of the outer packaging material to seal the battery internal elements.
[0033]
A polymer battery according to a twelfth aspect is characterized in that the adhesive layer on the outer side of the outer covering material is an ionomer in the eleventh aspect.
[0034]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
Example 1 (Claims 1 and 2)
1 is a perspective view showing the structure of the battery, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. In this battery, the battery internal element shown in FIG. 10 is sandwiched between two outer enveloping materials 31, 31, and these outer enveloping materials 31, 31 are fused around them (32 is a fusion part, 33 Is formed by sealing the battery internal elements. The current is taken out at the positive terminal 14a and the negative terminal 14b.
[0035]
For example, as shown in FIG. 11, the positive electrode plate 11 is a composite oxide of lithium and transition metal such as LiV ₂ O ₅ , LiCoO ₂ , LiNiO on both surfaces of a current collector 21 made of aluminum foil having a rectangular shape and a thickness of about 20 μm. ₂ or LiMn ₂ O ₄ or the like is applied and dried as the positive electrode active material 22.
[0036]
On the other hand, the negative electrode plate 12 is, for example, carbon that can be doped / undoped with lithium ions, such as carbon having a graphite structure or soft graphite, on both sides of a current collector 23 made of a copper foil having a rectangular shape and a thickness of about 10 μm as shown in FIG. Carbon such as carbonized carbon material is applied and dried as the negative electrode active material 24.
[0037]
In FIG. 11, for example, a porous polyethylene film or a porous polypropylene film having a thickness of about 25 μm is used as the separator 13 in a bag shape. The electrolyte 25 is, for example, a nonaqueous electrolytic solution obtained by dissolving LiPF _{6 in} a mixed solvent of ethylene carbonate (EC) and dimethyl carbonate (DMC), or LiBF ₄ or LiN (CF ₃ SO ₂ ) ₂ dissolved in the solvent. Nonaqueous electrolytes are used, or polymer gel electrolytes obtained by gelling them are used.
[0038]
In this embodiment, a battery power generation element having a combined structure of positive electrode plate 11 / electrolyte 25 / separator 13 / electrolyte 25 / negative electrode plate 12 is sandwiched between outer enveloping materials 31 and 31, and around the outer enveloping materials 31 and 31. A battery is constructed by fusing them to seal the internal elements of the battery.
[0039]
FIG. 7 is a cross-sectional view showing the laminated structure of the outer envelope material 31 having a seven-layer structure, and shows the function of each layer. FIG. 8 is a cross-sectional view showing an example of a material forming each layer of the envelope material 31. 7 includes a protective layer 41, an adhesive layer 42a, a barrier metal layer 43, an adhesive layer 42b, a short prevention layer 44, and an adhesion layer (first adhesion layer 45 and second adhesion layer 46) from the outside. It is the form which laminated | stacked in order of 2 layers.
[0040]
Specifically, using FIG. 7 and FIG. 8, the protective layer 41 is a heat-resistant film having a thickness of 20 μm and is made of polyethylene terephthalate 51. The adhesive layer 42a at the interface between the protective layer 41 and the barrier metal layer 43 is made of an ionomer 52 that is a heat-sealing resin film. The barrier metal layer 43 is an aluminum foil 53 having a thickness of 30 to 100 μm. The adhesive layer 42 b at the interface between the barrier metal layer 43 and the short prevention layer 44 is made of an ionomer 54. The short prevention layer 44 is a heat resistant film and is made of polyethylene terephthalate 55.
[0041]
The first adhesion layer 45 is made of linear low density polyethylene (LLDPE) 56, and the second adhesion layer 46 is made of ionomer 57. The fusing surface 33 (see FIG. 2) is made of ionomers (ionomers 57, 57), so that the fusing force is high and uniform. Further, the adhesion between the ionomer 57 and the positive electrode terminal 14a and the negative electrode terminal 14b (both made of Ni) is also good.
[0042]
Example 2 (Claim 3)
3 is a perspective view showing the battery structure, and FIG. 4 is a cross-sectional view taken along the line BB ′ of FIG. In this battery, the inner element of the battery is sandwiched between one outer envelope material 31 folded in two, and the outer envelope materials are fused together at the fusion portions 32 on the three sides of the outer envelope material 31. It is constructed by sealing the element.
[0043]
Example 3 (Claim 13)
FIG. 5 is a perspective view showing the battery structure, and FIG. 6 is a cross-sectional view taken along the line CC ′ of FIG. In this battery, the outermost surface (protective layer 41 made of polyethylene terephthalate 51) and the innermost surface (second adhesion layer 46 made of ionomer 57) are fused to form a cylindrical shape. The internal battery element is sandwiched between the folded enveloping material 31 and the external enveloping material 31 is fused on two sides of the external enveloping material 31 to seal the internal battery element. Since the adhesiveness between the polyethylene terephthalate 51 and the ionomer 57 is relatively good, it is possible to form the fused surface 33 in a good fused state by fusing them. Note that, as shown in FIG. 9, if the ionomer 61 is laminated on the polyethylene terephthalate 51 (protective layer 41), the outer enveloping material can be fused by bonding of the ionomers. The adhesive force is further increased.
[0044]
In the examples, polyethylene terephthalate was used for the protective layer, but OPP (stretched polypropylene) or NY (polyamide) may be used.
OPP or PAN (polyacrylonitrile) may be used for the short prevention layer, or EMAA may be used for the adhesion layer. Further, PP, PE, CPP, EMA, EVA and the like can be used in consideration of hygroscopicity, swelling property, electrolytic solution resistance, adhesiveness and layer structure.
Furthermore, Ni foil can also be used as a barrier metal layer. Moreover, although the separator was used in the Example of this invention, even if a separator is abbreviate | omitted, there will be no influence on the effect by this invention.
[0045]
【The invention's effect】
As described above, according to the poor invention, the following effects can be obtained.
(1) Claims 1 to 3, 11
A battery internal element formed by alternately stacking a positive electrode plate and a negative electrode plate with an electrolyte layer and an optional separator interposed therebetween is sandwiched between outer envelope materials, and the outer envelope material is surrounded by the outer envelope material. In a battery constructed by fusing together and sealing battery internal elements, the outer enveloping material is protected from the outside by a protective layer (outer protective layer), an adhesive layer, a barrier metal layer, an adhesive layer, and a short prevention layer. Since the structure is formed by stacking the adhesion layers in order, the battery internal element is formed by sealing the battery internal element by sandwiching the outer envelope material around the outer envelope material and sealing the battery internal element. Can be prevented.
[0046]
(2) Claim 5
Moreover, since the outer protective layer of the outer covering material is formed of a polyethylene terephthalate film that is a heat-resistant resin film, the strength as a battery is increased.
[0047]
(3) Claims 6 to 10
In order to improve the adhesion between the barrier metal layer of the underlying metal foil and the protective layer, an ionomer adhesive layer, which is a heat-fusible resin film, is provided. Even when a pinhole is generated in the film, the metal foil is not exposed to the outside air, causing a short circuit with the terminal, and no entry of outside air or advancement of the battery internal element occurs. Moreover, since the adhesiveness between polyethylene terephthalate and ionomer is good, the safety of the battery is improved.
In addition, when a short-circuit prevention layer made of polyethylene terephthalate is provided inside the barrier metal layer and an ionomer is placed as an adhesive layer between the barrier metal layer and the short-circuit prevention layer, pinholes are generated in the inner heat-fusible resin. In addition, a short circuit between the metal foil and the current collector can be prevented.
[0048]
(4) Claims 1 to 11
In the battery of the present invention, the outer packaging material is selected in consideration of the electrolytic solution resistance / adhesiveness and the hygroscopicity / swelling property, which are negative factors depending on the internal elements of the battery, and the heat resistant resin material and the fusible resin. To achieve a compact battery, a thin battery with a 7-layer laminated structure that is combined with the optimum layer structure according to the material, and by fusing the envelope materials together and sealing the battery internal elements The flat power generation element was packaged in a liquid-tight and air-tight manner with an outer covering material having a metal foil and a heat-sealing resin film. For this reason, when a battery power generation element using a non-aqueous electrolyte is packaged, unlike conventional batteries, moisture, oxygen, and nitrogen in the outside air can enter the power generation element, and electrolyte leakage outside the battery can occur. Since it can be accurately prevented, there is no performance degradation and no reduction in safety due to these, and both the energy density per weight and the energy density per volume are increased, and a long life and high reliability are obtained.
[0049]
(5) Claims 1 to 11
Good adhesion with polyethylene terephthalate short-circuit prevention layer, and good adhesion between the first adhesion layer made of linear low density polyethylene (LLDPE) with good electrolytic solution resistance and LLDPE and electrolytic solution resistance, And since the said adhesion layer was comprised by using the ionomer with favorable adhesiveness with a terminal metal as a 2nd adhesion layer, a high performance battery is obtained.
[0050]
(5) Claim 11
A battery is formed by folding a single envelope material into a cylindrical shape and sandwiching a battery internal element, and sealing the battery internal element by fusing two sides (the outermost surface and the innermost surface) of the envelope material. Since it comprised, the workability | operativity of battery manufacture improves.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a structure of a battery according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA ′ of FIG.
FIG. 3 is a perspective view showing the structure of a battery according to another embodiment.
4 is a cross-sectional view taken along line BB ′ of FIG.
FIG. 5 is a perspective view showing the structure of a battery according to another embodiment.
6 is a cross-sectional view taken along the line CC ′ of FIG.
FIG. 7 is a cross-sectional view showing the laminated structure of the envelope material constituting the battery according to the present invention, and showing the function of each layer.
8 is a cross-sectional view showing an example of a material for forming each layer of the envelope material of FIG.
FIG. 9 is a cross-sectional view showing another example of the outer covering material.
FIG. 10 is a perspective view showing a structure of a conventional secondary battery.
11 is a schematic cross-sectional view showing a battery power generation element of the secondary battery of FIG.
FIG. 12 is a cross-sectional view showing an exterior structure of a conventional flat thin battery.
13 is a cross-sectional view showing a laminated structure of an envelope material constituting the battery of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stainless steel board | substrate 2 Ionomer film 3 Conductive glass board | substrate 4 Positive electrode 5 Solid electrolyte 6 Negative electrode 7 Aluminum foil laminated film 7a Aluminum foil 7b Ionomer film 7c Polyester film 8 Negative electrode side lead body 9 Positive electrode side lead body 11 Positive electrode plate 12 Negative electrode plate 13 Separator 14a Positive electrode terminal 14b Negative electrode terminal 21 Current collector 22 Positive electrode active material 23 Current collector 24 Negative electrode active material 25 Electrolyte 31 Outer enveloping material 32 Fusing part 33 Fusing surface 41 Protective layers 42a and 42b Adhesive layer 43 Barrier Metal layer 44 Short prevention layer 45 First adhesion layer 46 Second adhesion layer 51 Polyethylene terephthalate 52, 54 Ionomer 53 Aluminum foil 55 Polyethylene terephthalate 56 Linear low density polyethylene (LLDPE)
57,61 Ionomer

Claims (12)

A battery internal element formed by alternately stacking a positive electrode plate and a negative electrode plate with an electrolyte layer and an optional separator interposed therebetween is sandwiched between outer envelope materials, and the outer envelope material is surrounded by the outer envelope material. In a battery constructed by fusing together and sealing the battery internal elements, the outer enveloping material is formed of a protective layer, an adhesive layer, a barrier metal layer, an adhesive layer, an anti-shorting layer, an adhesion layer from the outside. It is a form that is laminated in order ,
The thin polymer battery is characterized in that the adhesion layer is composed of two layers in which linear low density polyethylene (LLDPE) and an ionomer are sequentially laminated from the short-circuit prevention layer side. 2. The thin polymer battery according to claim 1, wherein the battery inner element is sandwiched between two outer enveloping materials, and the outer enveloping materials are fused around the outer enveloping material to seal the battery inner element. . The battery inner element is sealed by sandwiching the battery inner element between two outer enveloping materials folded in two, and fusing the outer enveloping materials on three sides of the outer enveloping material. 2. The thin polymer battery according to 1. The thin polymer battery according to claim 2 or 3, wherein the protective layer is a heat resistant film. The thin polymer battery according to claim 4, wherein the heat-resistant film of the protective layer is a polyethylene terephthalate film. 4. The thin polymer battery according to claim 2, wherein the adhesive layer between the protective layer and the barrier metal layer is an ionomer. 2. The thin polymer battery according to claim 1, wherein the barrier metal layer is an aluminum foil. 4. The thin polymer battery according to claim 2, wherein the adhesive between the barrier metal layer and the short prevention layer is an ionomer. 4. The thin polymer battery according to claim 2, wherein the short prevention layer is a heat resistant film. 10. The thin polymer battery according to claim 9, wherein the heat resistant film of the short prevention layer is polyethylene terephthalate. The battery inner element is sandwiched between one outer enveloping material that is fused between the outermost surface of the outer enveloping material and the innermost surface and folded into a cylindrical shape, and the outer enveloping material is surrounded by two sides of the outer enveloping material The thin polymer battery according to claim 1, wherein the battery material is formed by fusing the packaging materials together to seal the battery internal element. The thin polymer battery according to claim 11, wherein the adhesive layer on the outer side of the envelope material is an ionomer.

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