JP2000285879A - Battery and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery capable of holding its performance by preventing the outer air from entering and to provide a method for manufacturing thereof. SOLUTION: In this method for manufacturing a battery, a laminated electrode body is sealed inside a laminated container 30, and the laminated electrode is formed by laminating positive and negative electrodes through an electrolyte layer. The laminated container 30 is sealed by sealed parts 31, 32 and 33. A positive electrode lead wire 21 and a negative electrode lead wire 22 mounted on the laminated electrode are led out from the inside of the laminated container 30 through the sealed part 31. The internal pressure of the laminated container 30 is the same as the external pressure or higher and can prevent the outer air from entering. This battery is manufactured by inserting the laminated electrode body into the laminated container 30 being opened its one side and by sealing the opened side in the atmospheric pressure atmosphere or pressurized atmosphere after the inside is thinned by allowing the interior to be temporarily in the depressurized atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery in which a laminated electrode body in which a positive electrode and a negative electrode are laminated via an electrolyte layer is enclosed in an exterior member, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, cordless and portable electronic devices have been desired, and portable electronic devices that are smaller, lighter, and thinner have been developed one after another. Accordingly, in portable electronic devices, the proportion of the weight and volume of the battery, which is the energy source, is gradually increasing. In addition, portable electronic devices are becoming more multifunctional, and tend to increase power consumption.
As a result, the capacity of the battery is required to be increased, and it is necessary to increase the volume of the battery. Therefore, a more compact battery having a high energy density is required.

As batteries used in portable electronic devices,
A secondary battery such as a lead storage battery or a nickel cadmium battery has been used, but a nickel hydride secondary battery or a lithium ion secondary battery has also been put into practical use. Conventionally, these batteries use an electrolytic solution, and thus have problems such as liquid leakage. Therefore, recently, a gel electrolyte or a solid electrolyte may be used instead of the electrolytic solution. For example, some gel electrolytes are made by impregnating an electrolytic solution with a polymer material, and some solid electrolytes are made of a polymer material having ion conductivity, or an inorganic material such as ceramic or glass having ion conductivity. There is. Batteries using these electrolytes can be further reduced in size, weight and thickness without fear of liquid leakage, and can obtain a high energy density, so that they can be used as power supplies for portable electronic devices. Highly expected.

Conventionally, batteries using these gel electrolytes or solid electrolytes include, for example, a laminate electrode body in which a positive electrode and a negative electrode are laminated via an electrolyte layer, are sealed in an exterior member, and are evacuated to a vacuum atmosphere. It was produced by sealing the exterior member inside. The sealing in a vacuum reduced pressure atmosphere is intended to reduce the size, weight, and thickness of the battery and to improve the volume energy density. Therefore, in these batteries, the internal pressure of the exterior member has been a negative pressure lower than the external pressure.

[0005]

However, in such a conventional battery in which the inside of the exterior member has a negative pressure, the outside air enters the interior of the exterior member from the sealing portion of the exterior member, and the exterior member has a negative pressure. However, there was a problem that the inside of the device could not be kept in a sealed state, and the moisture resistance was poor. As a result, the battery performance deteriorates, and quality reliability cannot be maintained for a long period of time. Further, in order to enhance the sealing property of the exterior member, the number of steps related to sealing of the exterior member is increased, and the productivity and yield are reduced, resulting in an increase in manufacturing cost. These issues are, in particular,
It was remarkable in the battery using the gel electrolyte.

The present invention has been made in view of such a problem, and an object of the present invention is to prevent the invasion of outside air,
An object of the present invention is to provide a battery capable of maintaining battery performance for a long period of time and a method for manufacturing the battery.

[0007]

A battery according to the present invention is characterized in that a laminated electrode body in which a positive electrode and a negative electrode are laminated via an electrolyte layer is sealed in an exterior member, and a pressure inside the exterior member is reduced. Is equal to or higher than the external pressure.

[0008] The method for producing a battery according to the present invention comprises the steps of forming a laminated electrode body in which a positive electrode and a negative electrode are laminated via an electrolyte layer; And enclosing the inside.

In the battery according to the present invention, the internal pressure of the exterior member is equal to or higher than the external pressure, so that outside air is prevented from entering the interior of the exterior member.

In the battery manufacturing method according to the present invention, after the laminated electrode body is formed, it is sealed in the exterior member in an atmospheric pressure atmosphere or a pressurized atmosphere.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, a lithium ion secondary battery will be described as an example.

(First Embodiment) FIG. 1 shows an external configuration of a battery according to a first embodiment of the present invention. FIG. 2 shows the internal structure of the battery shown in FIG. The battery has a laminated electrode body 10, a positive electrode lead wire 21 and a negative electrode lead wire 22 attached to the laminated electrode body 10, and a laminate container 30 as an exterior member for enclosing the laminated electrode body 10 therein. ing.

FIG. 3 is a sectional view of the laminated electrode assembly 10 shown in FIG.
It shows a cross-sectional structure in the direction of the arrow along the -I line.
The laminated electrode body 10 is configured such that the positive electrode 11 and the negative electrode 12
3, and are wound with the positive electrode 11 inside. Between the positive electrode 11 and the negative electrode 12,
Further, a separator 14 is inserted via the electrolyte layer 13.

The positive electrode 11 is, for example, a positive electrode current collector layer 11a.
And a positive electrode active material layer 11b provided on the electrolyte layer 13 side of the positive electrode current collector layer 11a. The positive electrode active material layer 11b may be provided not only on the electrolyte layer 13 side of the positive electrode current collector layer 11a, but also on both surfaces of the positive electrode current collector layer 11a, that is, on the opposite side of the electrolyte layer 13.

The positive electrode current collector layer 11a is made of, for example, a metal foil such as an aluminum (Al) foil, a nickel (Ni) foil, or a stainless steel foil, and is preferably porous. This is because the adhesive strength to the positive electrode active material layer 11b can be increased by making the electrode porous. For example, as the porous metal foil, there are a punching metal, an expanded metal, a metal foil having a large number of openings formed by etching, and the like.
a is preferably constituted by any of these.

The positive electrode active material layer 11b includes, for example, a positive electrode active material and graphite as a conductive agent.
As the positive electrode active material, a metal oxide or sulfide not containing lithium, such as titanium sulfide (TiS ₂ ), molybdenum selenide (MoSe ₂ ) or vanadium oxide (V ₂ O ₅ ), or a lithium composite containing lithium There are oxides or sulfides, specific polymer materials, and the like, and one or more of these are used depending on the intended use of the battery.

In particular, Li _x MO 2 is used as the positive electrode active material.
_{The use of} a lithium composite oxide mainly composed of ₂ is preferable because a high voltage can be generated and the energy density can be increased. In this composition formula, M is 1
It represents more than one kind of transition metal, and specifically, at least one of cobalt (Co), nickel (Ni) and manganese (Mn) is preferable. Further, the value of x varies depending on the charge / discharge state of the battery, and is usually 0.05 ≦ x ≦
1.10. Specific examples of such a lithium composite oxide include LiCoO ₂ , LiNiO ₂ , and LiNi _y.
Co _1-y O ₂ (where 0 <y <1) or LiMn ₂
O _{4 and the} like. Incidentally, here, for example, LiCoO ₂ is used as the positive electrode active material.

The negative electrode 12 is, for example, similar to the positive electrode 11,
It has a negative electrode current collector layer 12a and a negative electrode active material layer 12b provided on the electrolyte layer 13 side of the negative electrode current collector layer 12a. Note that the negative electrode active material layer 12b is
Similarly to b, it may be provided on the opposite side of the negative electrode current collector layer 12a from the electrolyte layer 13. The negative electrode current collector layer 12a
For example, the positive electrode current collector layer 1 is made of a metal foil such as a copper (Cu) foil, a nickel foil, or a stainless steel foil.
It is preferable to be porous like 1a. This is because the adhesive strength with the negative electrode active material layer 12b can be increased.

The negative electrode active material layer 12b contains, for example, one or more of a carbonaceous material, an oxide or a polymer material capable of inserting and extracting lithium metal, a lithium alloy, and lithium ions. It is composed of Examples of the carbonaceous material include a non-graphitizable carbon-based material and a graphite-based carbon material. Specific examples include pyrolytic carbons, cokes, graphites, glassy carbon fibers, carbon fibers, and organic polymer compounds. A fired body or activated carbon may be used. Among them, coke includes pitch coke,
There are needle coke, petroleum coke, and the like. The organic polymer compound fired body is obtained by firing a polymer material such as a phenol resin or a furan resin at an appropriate temperature and carbonizing the material. In addition, tin oxide (S
nO ₂ ) and the like, and the polymer material includes polyacetylene and polypyrrole. Incidentally, here, the negative electrode active material layer 12b is composed of mesocarbon microbeads, carbon and natural graphite.

The electrolyte layer 13 is composed of, for example, an electrolyte salt, a solvent for dissolving the electrolyte salt, and a polymer material. Examples of the electrolyte salt include LiPF ₆ ,
LiBF ₄ , LiAsF ₆ , LiClO ₄ , LiCF ₃
SO ₃ , LiN (SO ₂ CF ₃ ) ₂ , LiC (SO ₂ C
One or more of lithium salts such as F ₃ ) ₃ , LiAlCl _{4 and} LiSiF ₆ are used. As the solvent, for example, one or more of organic solvents such as esters, ethers, and carbonates are used. As the polymer material, for example, polyethylene oxide, polyvinylidene fluoride, polyacrylonitrile, or the like is used.

The separator 14 separates the positive electrode 11 and the negative electrode 12 and prevents a short circuit of current due to contact between the two electrodes.
It allows lithium ions to pass through. The separator 14 is made of, for example, a porous film made of a polyolefin-based material such as polypropylene or polyethylene, or a porous film made of an inorganic material such as a ceramic nonwoven fabric. May be laminated.

Positive lead 21 and negative lead 22
As shown in FIG. 1 and FIG. 2, the laminate container 30 is inserted through a seal portion 31 of the laminate container 30 described later.
From the inside to the outside in the same direction. A part of the positive electrode lead wire 21 is connected to the positive electrode current collector 11a inside the laminate container 30, as shown in FIGS. A part of the negative electrode lead wire 22 is connected to the negative electrode current collector 12a inside the laminate container 30, as also shown in FIGS. These positive electrode lead 21 and negative electrode lead 22
Are, for example, in the form of a thin plate or a mesh, and are each made of a metal material such as aluminum, copper, nickel, or stainless steel.

A positive lead 21 and a negative lead 22
As shown in FIG. 1 and FIG. 2, a coating 23 for improving adhesion is provided corresponding to a portion where a sealing portion 31 of a laminating container 30 described later contacts. The adhesion improving coating 23 improves the adhesion between the positive electrode lead wire 21 and the negative electrode lead wire 22 and the laminate container 30 to prevent outside air from entering the inside of the laminate container 30, and increases the height of the laminate container 30. This is for maintaining the airtightness.

FIG. 4 shows the structure of the adhesion improving film 23 in a partially broken and enlarged view. The coating 23 for improving adhesion is composed of a first coating 23a that directly covers the positive electrode lead wire 21 and a second coating 23b that covers the first coating 23a. First coating 23a
Is for making the positive lead wire 21 or the negative lead wire 22 adhere to the second coating 23b, and is made of a resin material having excellent adhesion to them, such as ethylene methacrylic acid polymer and ethylene acrylic acid. It is composed of a polymer, an ionomer, or a low-density polyethylene having a linear or side chain. The thickness of the first coating 23a is preferably, for example, 10 to 50 μm.

The second coating 23b is for bringing the first coating 23a into close contact with the laminate container 30.
It is made of a resin material having excellent adhesion to them and insulating properties. For example, it is made of a material having a lower melting point than the material constituting the laminate container 30, specifically, low-density polyethylene, high-density polyethylene, or non-stretched polypropylene having a linear or side chain. The thickness of the second coating 23b is, for example, 30 to 10
Preferably, it is 0 μm. Thus, by forming the adhesion improving coating 23 from the first coating 23a and the second coating 23b, the laminate container 30 can be formed regardless of the materials or shapes of the positive electrode lead 21 and the negative electrode lead 22. Adhesion can be easily achieved by heat fusion or the like, and adhesion can be improved.

The second coating 23b is preferably formed so as to completely cover the first coating 23a. Since the first coating 23a may contain a highly water-absorbing substance such as acrylic acid, the corrosion of the positive lead wire 21 and the negative lead wire 22 is prevented, and moisture enters the inside of the laminate container 30. This is to prevent that. Further, it is preferable that the second coating film 23b is formed up to a portion reaching the outside of the laminate container 30. The second coating 23b also has a function as an insulating film, and the positive electrode lead wire 2 formed through an aluminum foil exposed on an end surface of a laminate container 30 described later.
This is to prevent a short circuit between the lead wire 1 and the negative electrode lead wire 22 and secure electrical insulation.

Positive lead 21 and negative lead 22
Also, as shown in FIG. 2 and FIG.
Alternatively, an insulating coating 24 is provided from a portion connected to the negative electrode 12 to a coating 23 for improving adhesion.
The insulating coating 24 contacts the negative electrode 12 or the positive electrode 11 of the opposite polarity when the positive electrode lead 21 or the negative electrode lead 22 is short-circuited, or peels off the positive electrode active material layer 11b or the negative electrode active material layer 12b to form a battery. This is to prevent the reliability from being impaired. The insulating coating 24 is
May be formed separately from the second coating 23b, or may be formed integrally with the second coating 23b. The insulating film 24 may be made of, for example, the same material as the second film 23b, or may be made of another material such as polyimide. It is preferable that the film thickness of the insulating film 24 is, for example, less than 50 μm.

As shown in FIG. 1, the laminate container 30 is formed of, for example, a laminated film in which a polyethylene terephthalate film, an aluminum foil and a polyethylene film are laminated in this order, and the end of the laminated film with the polyethylene film inside. It is formed in a bag shape by seal portions 31, 32, and 33 in which the portions are in close contact. Here, the rectangular laminated film is folded in two, the folded sides are parallel to the lead-out directions of the positive electrode lead 21 and the negative electrode lead 22, and the sealing portions 31, 32, and 33 are provided on the other three sides. Each has a formed structure. These seal portions 31, 32, and 33 are in close contact with each other by, for example, fusion or an adhesive.

The inside of the laminating container 30 has a sealing portion 3
1, 32, 33, the internal pressure is equal to or higher than the external pressure. This is because the sealing portion 3 is provided inside the laminate container 30.
This is to prevent the battery performance from being deteriorated due to the invasion of outside air through 1, 32, and 33. The inside of the laminate container 30 is also in a dry air atmosphere or an inert gas atmosphere. Here, dry air refers to air having a humidity of about 0% and a dew point of −40 ° C. or less. The inert gas includes argon (Ar) gas other than nitrogen gas (N ₂ ) and helium (H
e) Gas, neon (Ne) gas or krypton (K
It is preferable to use one or more of r) gas and the like. This is because water and nitrogen react with lithium and cause deterioration of battery performance.

Although air contains nitrogen gas, there is no problem if the concentration is such that it is contained in air. Also, the inert gas may contain nitrogen gas as long as the reaction with lithium does not cause a problem.

A battery having such a configuration can be manufactured as follows.

FIGS. 5 to 7 show the respective manufacturing steps. First, for example, a positive electrode lead 21 and a negative electrode lead 22 are formed, respectively. For example, as shown in FIG. 5, a wire 41 made of metal processed into a thin plate or a mesh is prepared, and a plurality of first coatings 23a are formed on the wire 41 at appropriate intervals. Thereafter, a plurality of second coatings are formed so as to cover each first coating 23a.
And a plurality of insulating films 24 are formed adjacent to the second films 23b, respectively, and cut into predetermined lengths to form the positive electrode lead 21 and the negative electrode lead 22. Form each.

Next, for example, the positive electrode 11 and the negative electrode 12
Are formed respectively. For example, a binder such as polyvinylidene fluoride and a solvent such as dimethylformamide are mixed with the positive electrode active material and graphite, and the mixture is applied onto the positive electrode current collector layer 11a made of a metal foil, and then dried and roll-pressed. The positive electrode active material layer 11b is formed, and the positive electrode 11 is manufactured. Similarly, for example, a negative electrode active material layer 12b is formed by mixing a binder and a solvent with the negative electrode active material, applying this mixture on a negative electrode current collector layer 12a made of a metal foil, and then drying and roll pressing. Then, the negative electrode 12 is manufactured.

Subsequently, for example, the positive electrode 1 is formed by tab welding.
A part of the positive electrode lead wire 21 is attached to the positive electrode current collector layer 11a with the insulating film 24 corresponding to one edge, and the electrolyte layer 13 is formed on the positive electrode active material layer 11b. Similarly, a part of the negative electrode lead wire 22 is connected to the negative electrode current collector layer 12.
a, and an electrolyte layer 13 is formed on the negative electrode active material layer 12b. Thereafter, the positive electrode 11 and the negative electrode 12 are adhered to each other with the separator 14 interposed therebetween.
To form

After forming the laminated electrode body 10, for example,
As shown in FIG. 6 (A), the rectangular laminated film 42 is folded in two, and as shown in FIG. 6 (B), one side adjacent to the bending side is fused using a pressure roller (not shown). Then, a seal portion 33 is formed in a shaded portion. In addition, as a fusion method, a method of applying heat to the seal portion 33 or propagating ultrasonic waves to perform thermal fusion is simple and preferable.

Next, as shown in FIG. 7A, for example, the side opposite to the bent side is fused in the same manner as the seal part 33, and the seal part 32 is formed in the shaded portion. Subsequently, as shown in FIG. 7B, for example, the laminated electrode body 10 to which the positive electrode lead wire 21 and the negative electrode lead wire 22 are attached is bent from the other open side adjacent to the bent side of the laminated film 42. Insert between.

After inserting the laminated electrode body 10, for example,
The inside of the laminated film 42 is set to a reduced pressure atmosphere of about 10 Torr, and the laminated film 42 is
0, and the thickness is reduced by caulking force under reduced pressure. After that, the laminated film 42 in which the laminated electrode body 10 is inserted is placed in a dry air atmosphere or an inert gas atmosphere at atmospheric pressure or pressure, and the inside of the laminate film 42 is dried at atmospheric pressure or pressure. The atmosphere is an air atmosphere or an inert gas atmosphere. At this time, the shape of the laminated film 42 is almost kept as it is thinned by swaging. The details of the dry air and the inert gas are as described above.

Thereafter, in this dry air atmosphere or an inert gas atmosphere at atmospheric pressure or pressure,
For example, the open side is fused in the same manner as the seal portions 32 and 33, and the seal portion 31 is formed in a shaded portion. Thus, the laminate container 30 is formed, and at the same time, the laminated electrode body 10 is sealed inside the laminate container 30 to form the battery shown in FIG.

Such a battery operates and operates as follows.

In this battery, when charged, for example, lithium ions are released from the positive electrode 11 and occluded in the negative electrode 12 via the electrolyte layer 13 and the separator 14. When the discharge is performed, for example, lithium ions are separated from the negative electrode 12, and the positive electrode 1 is separated via the electrolyte layer 13 and the separator 14.
Occluded in 1. Here, since the internal pressure of the laminate container 30 is equal to or higher than the external pressure, the outside air containing water or the like that reacts with lithium does not easily enter the inside of the laminate container 30. I have. Therefore, high battery performance can be obtained over a long period of time.

As described above, according to the battery of the present embodiment, the internal pressure of the laminate container 30 is set to be equal to or higher than the external pressure. It is possible to prevent outside air including the like from entering the inside of the laminate container 30. Therefore, high battery performance can be maintained for a long time, and battery reliability can be improved. In addition, since intrusion of outside air can be prevented with a simple configuration, the manufacturing process can be simplified, productivity can be improved, and manufacturing cost can be reduced.

Further, since the inside of the laminating container 30 is set to a dry air atmosphere or an inert gas atmosphere, a reaction with lithium can be prevented, and the performance of the battery can be stably maintained. When an inert gas is used, a higher effect can be obtained by using a gas other than nitrogen gas or a gas containing nitrogen gas at a low concentration.

In addition, using the laminate container 30, the adhesion improving coating 2
3, the adhesion between the positive electrode lead wire 21 and the negative electrode lead wire 22 and the laminate container 30 can be improved. Therefore, the sealing property of the laminate container 30 is improved, so that the invasion of the outside air can be prevented. Further, the laminate container 3 can be easily formed by heat fusion or the like.
0 can be brought into close contact, and high adhesion can be easily obtained.

Furthermore, according to the battery manufacturing method according to the present embodiment, the laminated electrode body 10 is sealed in the laminate container 30 in an atmosphere of atmospheric pressure or pressurized dry air or an inert gas atmosphere. As a result, the battery according to the present embodiment can be easily manufactured.

The fact that the battery according to the present embodiment can effectively prevent outside air from entering the inside of the laminate container 30 will be further described based on specific experimental results.

Here, a battery according to the present embodiment in which the pressure inside the laminate container 30 was equal to the pressure outside the laminate container 30 was prepared, and a moisture permeability test was performed. Specifically, a humidity of 95% containing 20 g of silica gel and a temperature of 65% was used.
The battery was left in a container at a temperature of ℃, and the change with time in the weight of the battery was examined. FIG. 8 shows the result. As a comparative example, a battery having the same configuration as that of the present embodiment except that the internal pressure of the laminate container was lower than the external pressure was prepared. A wetness test was performed. The results are also shown in FIG.

As shown in FIG. 8, according to the present embodiment, the increase in weight is 0.02 even after 800 hours or more.
% Or less, according to the comparative example, the increase in weight was at least 0.05% after 800 hours or more, which is more than double that of the present embodiment. That is, it can be seen that the amount of moisture that enters the inside of the laminate container 30 is smaller in the present embodiment, and if the pressure inside the laminate container 30 is equal to the external pressure, the outside air will It can be seen that intrusion can be prevented. Although the case where the internal pressure of the laminate container 30 is equal to the external pressure has been described here, similar results can be obtained when the internal pressure of the laminate container 30 is higher than the external pressure. Can be.

(Second Embodiment) FIG. 9 shows an external configuration of a battery according to a second embodiment of the present invention. In this embodiment, a modified example of the laminate container 50 according to the first embodiment will be described. Therefore, here, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the laminate container 50, a rectangular laminate film is folded in two, the folded side is perpendicular to the lead-out direction of the positive electrode lead wire 21 and the negative electrode lead wire 22, and the sealing portions 51, 52 and 53 are formed respectively. In addition, the pressure, atmosphere, and the like inside the laminate container 50 are the same as those in the first embodiment.

This battery can be manufactured as follows.

FIG. 10 and FIG. 11 show the respective manufacturing steps. First, as in the first embodiment,
The laminated electrode body 10 to which the positive electrode lead 21 and the negative electrode lead 22 are attached is formed. Next, for example, as shown in FIG. 10, the rectangular laminated film 43 is folded in two, and as shown in FIG. 11A, both sides adjacent to the bent sides are pressed using a pressure roller (not shown). The seal portions 52 and 53 are formed at the portions indicated by shading.

Subsequently, as shown in FIG. 11B, for example, the laminated electrode body 10 to which the positive electrode lead wire 21 and the negative electrode lead wire 22 are attached is laminated from the open side opposite to the bent side to the laminate film 43. Insert between
After that, in the same manner as in the first embodiment, the inside of the laminate film 43 is reduced in thickness under a reduced-pressure atmosphere, and the side which is open in an atmosphere or a pressurized dry air atmosphere or an inert gas atmosphere is opened. To form a seal portion 51 in the shaded portion. This allows
The battery shown in FIG. 9 is formed.

In this battery, the pressure and atmosphere inside the laminate container 50 are the same as those in the first embodiment, so that the battery operates in the same manner as the first embodiment. For example, the same effect as in the first embodiment can be obtained.

(Third Embodiment) FIG. 12 shows the appearance of a battery according to a third embodiment of the present invention. In this embodiment, another modification of the laminate container 60 according to the first embodiment will be described. Therefore, here, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the laminate container 60, a rectangular laminated film is folded in two, and a seal portion 61 is formed on a side opposite to the bent side. Then, the seal portion 61 is moved to the center to seal the other two sides. It has a structure in which the parts 62 and 63 are respectively formed. In addition, the pressure, atmosphere, and the like inside the laminate container 50 are the same as those in the first embodiment.

This battery can be manufactured as follows.

FIG. 13 and FIG. 14 show the respective manufacturing steps. First, as in the first embodiment,
The laminated electrode body 10 to which the positive electrode lead 21 and the negative electrode lead 22 are attached is formed. Then, for example, FIG.
(A) As shown in FIG.
4 is folded in two, and as shown in FIG. 13B, a side facing the bent side is fused using a pressure roller (not shown) to form a seal portion 61 in a shaded portion.

Subsequently, as shown in FIG. 14A, for example, the seal portion 61 is moved to the center, and one of the two open sides is fused in the same manner as the seal portion 61. Then, a seal portion 63 is formed in a shaded portion. After the formation of the seal portion 63, as shown in FIG. 14B, for example, the positive electrode lead 21 and the negative electrode lead 22
Is inserted between the laminate films 44 from the remaining open sides. After that, similarly to the first embodiment, the inside of the laminate film 44 is thinned by using a reduced-pressure atmosphere, and the side that is open in a dry air atmosphere or an inert gas atmosphere at atmospheric pressure or pressure is used. To form a seal portion 61 in the shaded portion. As a result, FIG.
Is formed.

Since the pressure and the atmosphere inside the laminate container 60 of this battery are the same as those of the first embodiment, the battery operates in the same manner as the first embodiment, and the operation of the present embodiment is similar to that of the first embodiment. For example, the same effect as in the first embodiment can be obtained.

As described above, the present invention has been described with reference to the respective embodiments. However, the present invention is not limited to the above embodiments, and can be variously modified. For example, in each of the above-described embodiments, the exterior members are laminated containers 30, 50,
Although the case of forming by 60 has been described, it may be formed by other materials. For example, even with a metal film, the same exterior member as in each of the above embodiments can be similarly formed.

In each of the above embodiments, the case where the laminated electrode body 10 is wound with the positive electrode 11 inside is described. However, the laminated electrode body 10 may be wound with the negative electrode 12 inside. Further, as shown in FIG. 15, the laminated electrode body 10 may be folded, and as shown in FIG. 16, a plurality of laminated electrode bodies 10 may be stacked.

In addition, in each of the above embodiments, the case where the electrolyte layer 13 is constituted by the gel electrolyte composed of the electrolyte salt, the solvent and the polymer material has been described.
It may be constituted by another gel electrolyte,
Further, it may be constituted by a solid electrolyte made of a polymer material or an inorganic material having ionic conductivity.

Further, in each of the above embodiments,
Although the case where the separator 14 is provided on the laminated electrode body 10 has been described, the separator 14 may not be provided.

In addition, in each of the above embodiments, the description has been given by taking the lithium ion secondary battery as an example.
The present invention is widely applied to batteries using charge carriers other than lithium ions. Also, not limited to secondary batteries,
The same applies to other batteries such as primary batteries.

Further, in each of the above embodiments,
The case where the inside of the laminate containers 30, 50, 60 is set to a dry air atmosphere or an inert gas atmosphere has been described. There is no need to set the atmosphere, and another atmosphere may be used. If the reaction with nitrogen is not a problem, a nitrogen gas atmosphere or an atmosphere containing nitrogen gas may be used.

[0066]

As described above, according to the battery according to any one of the first to third aspects, the internal pressure of the exterior member is equal to or higher than the external pressure. With this configuration, it is possible to prevent outside air from entering the interior of the exterior member. Therefore, there is an effect that high battery performance can be maintained for a long time, and quality reliability can be improved. In addition, since the intrusion of outside air can be prevented with a simple configuration,
This also has the effect of simplifying the manufacturing process, improving productivity and reducing manufacturing costs.

In particular, according to the battery of the second aspect, the interior of the exterior member is made to have a dry air atmosphere or an inert gas atmosphere, so that the performance of the battery can be more stably maintained. To play.

Further, any one of claims 4 to 6
According to the battery manufacturing method described in the above, since the laminated electrode body is sealed in the exterior member in an atmospheric pressure atmosphere or a pressurized atmosphere, the battery of the present invention can be easily manufactured, There is an effect that the battery of the present invention can be easily realized.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an external configuration of a battery according to a first embodiment of the present invention.

FIG. 2 is a front view showing the internal configuration of the battery shown in FIG.

FIG. 3 is a cross-sectional view taken along a line II in FIG.

FIG. 4 is a front view showing a configuration of the adhesion improving coating shown in FIG. 1 in a partially broken and enlarged manner.

FIG. 5 is a front view illustrating one manufacturing process of the battery illustrated in FIG.

FIG. 6 is a front view illustrating each manufacturing process subsequent to FIG. 5;

FIG. 7 is a front view illustrating each manufacturing process subsequent to FIG. 6;

FIG. 8 is a characteristic diagram showing a result of a moisture resistance test.

FIG. 9 is a front view illustrating an external configuration of a battery according to a second embodiment of the present invention.

FIG. 10 is a front view illustrating one manufacturing process of the battery illustrated in FIG.

FIG. 11 is a front view illustrating each manufacturing process subsequent to FIG. 10;

FIG. 12 is a front view illustrating an external configuration of a battery according to a third embodiment of the present invention.

FIG. 13 is a front view showing each manufacturing process of the battery shown in FIG.

FIG. 14 is a front view illustrating each manufacturing process subsequent to FIG. 13;

FIG. 15 is a sectional view illustrating a modification of the present invention.

FIG. 16 is a sectional view illustrating another modification of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Laminated electrode body, 11 ... Positive electrode, 11a ... Positive electrode current collector layer, 11b ... Positive electrode active material layer, 12 ... Negative electrode, 12a ... Negative electrode current collector layer, 12b ... Negative electrode active material layer, 13 ... Electrolyte layer, 1
4 ... separator, 21 ... positive electrode lead wire, 22 ... negative electrode lead wire, 23 ... coating for improving adhesion, 23a ... first coating,
23b: second coating, 24: insulating coating, 30, 50, 6
0: laminate container (exterior member), 31, 32, 33,
51, 52, 53, 61, 62, 63 ... seal part, 41
… Wires, 42, 43, 44… laminated films

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 5H011 AA09 AA13 AA17 CC02 CC06 CC10 DD13 FF02 GG09 JJ25 5H029 AJ12 AJ14 AK02 AK03 AL06 AL07 AL08 AL12 AM03 AM04 AM05 AM07 BJ04 CJ28 HJ15

Claims (6)

[Claims] 1. A battery in which a stacked electrode body in which a positive electrode and a negative electrode are stacked via an electrolyte layer is sealed in an exterior member, wherein the pressure inside the exterior member is the same as the external pressure or A battery characterized by being higher than the external pressure. 2. The battery according to claim 1, wherein the inside of the exterior member is a dry air atmosphere or an inert gas atmosphere. 3. The battery according to claim 1, wherein the exterior member is formed of a laminate film. 4. A step of forming a laminated electrode body in which a positive electrode and a negative electrode are laminated via an electrolyte layer, and a step of enclosing the laminated electrode body in an exterior member in an atmospheric pressure atmosphere or a pressurized atmosphere. A method for producing a battery, comprising: 5. The method for manufacturing a battery according to claim 4, wherein the laminated electrode body is sealed in an exterior member in a dry air atmosphere or an inert gas atmosphere. 6. The method for producing a battery according to claim 4, wherein the exterior member is formed of a laminate film.