JP2000268884A - Lithium battery vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sense leakage of an organic electrolytic solution or a gas generated from an organic solvent likely to cause inflammation or explosion continuously, simply, and certainly. SOLUTION: In at least part of a vessel 1 or outside thereof, a leak sensor is provided to work with a laminate body 11 consisting of a sensor layer 11a and a pair of electrode layers 11b and 11c pinching the sensor layer 11a, wherein the sensor layer 11a contains highpolymers as a precursor of solid electrolyte and functions as an electrolyte when wetted and swollen with an organic solvent in an organic electrolytic solution to result in a change of its electroconductivity from before its being wetted and swollen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for a lithium battery using a non-aqueous organic electrolyte as an electrolyte.

[0002]

2. Description of the Related Art A lithium secondary battery has a high energy density and energy efficiency, and can provide a higher voltage than a battery of another type in a single cell. For example, research has been conducted on small or ultra-compact power supplies for use in mobile phones and notebook computers, but recently, for example, power supplies for electric vehicles and hybrid vehicles, or in general households, shops, small factories, etc. Is expected to be used for larger batteries for small-scale power storage.

As a lithium secondary battery for such a large battery, for example, a negative electrode having a negative electrode active material such as natural graphite, which can be doped or dedoped with lithium ions, and a transition metal containing or not containing lithium, for example. A combination of a positive electrode using an oxide of the above as a positive electrode active material and a non-aqueous organic electrolytic solution obtained by dissolving a lithium salt as an electrolyte in a non-aqueous organic solvent is suitably used.

[0004] The above-mentioned lithium secondary battery has the above-mentioned high energy density and high energy efficiency, which are the inherent characteristics of a normal lithium secondary battery, and has a higher energy efficiency than a case where metallic lithium is used for the negative electrode. In addition, they exhibit high safety and a long cycle life because they do not generate precipitates such as so-called dendrites even after repeated charging and discharging.

However, since the characteristics of lithium secondary batteries are greatly deteriorated due to moisture, it is needless to say that the water-containing components at the time of manufacture are reduced, and that even during use, it is necessary to surely prevent the penetration of moisture from outside the container. . In addition, since the organic solvent is used for the electrolytic solution, the composition of the electrolytic solution is deviated when the organic solvent is volatilized and escapes to the outside of the container. If sparks at the time of wiring short-circuit come into contact with the flammable organic solvent gas, there is a risk of ignition or explosion.Therefore, the lithium secondary battery container must be sure to prevent both moisture and organic solvent from permeating. It is required to be able to.

[0006]

However, in the above-mentioned electric vehicles and hybrid vehicles, if a container is slightly damaged due to, for example, a light contact accident,
As described above, the organic electrolyte containing the flammable organic solvent or the gas of the flammable organic solvent vaporized from the organic electrolyte may leak from the damaged portion.

Further, the amount of leakage increases as the size of the lithium secondary battery increases. Therefore, if the operation is continued without knowing it, sparks or the like at the time of short-circuiting of the wiring may come into contact and cause ignition or explosion. It is considered necessary to detect such a liquid leak or gas leak. However, at present, a simple and reliable means for continuously detecting the above-mentioned liquid leakage gas leakage has not been developed, which is an obstacle to using a lithium secondary battery as a power supply for electric vehicles and the like. It is one.

On the other hand, in the case of a battery for power storage, since it is used by standing at one place, there is little possibility that the container may be damaged such as liquid leakage or gas leakage as described above.
Nevertheless, this does not mean that no damage is caused. For example, there is a possibility that the container may be damaged during transportation of the battery or due to an earthquake, and liquid leakage and gas leakage may gradually occur. Also in this case, since such a liquid leak or a gas leak cannot be detected, if the battery is continuously used, a spark or the like at the time of short-circuiting of the wiring may come into contact, resulting in ignition or explosion.

An object of the present invention is to provide a means for continuously, simply and reliably detecting leakage of an organic electrolytic solution, gas leakage of a vaporized organic solvent, etc. which causes ignition or explosion as described above. To provide a new container for a lithium battery.

[0010]

Means for Solving the Problems In order to solve the above problems, the present inventors have paid attention to a solid electrolyte, which has recently been researched and developed as an electrolyte for a lithium battery. A solid electrolyte is a solid polymer formed by swelling a specific polymer such as polyacrylonitrile (PAN) with an organic solvent having a high relative dielectric constant such as propylene carbonate contained in a normal organic electrolyte. It utilizes the fact that it produces high ionic conductivity that can be used as an electrolyte, and its application to a small lithium battery is being studied.

Recently, the inventors have found that the polymer such as PAN, which can be said to be the precursor of the polymer solid electrolyte, has low conductivity and almost insulative properties before swelling the organic solvent, like a normal polymer. Although exhibiting the property, when the organic solvent is swollen, the electrical conductivity sharply rises, and as described above, the phenomenon showing high ionic conductivity that can be used as an electrolyte, the above-described leakage of the organic electrolytic solution, the vaporization of the organic solvent vaporized gas The use as a sensor to continuously detect gas leakage was studied.

As a result, a laminate is prepared in which the above-mentioned polymer layer as a solid electrolyte precursor is sandwiched between a pair of electrode layers, and the conductivity of the laminate is maintained between the pair of electrode layers. It has been found that if the measurement is carried out, it is possible to easily and reliably detect whether or not the organic solvent in the organic electrolyte solution exists in the atmosphere where the laminate is placed. Then, as a result of further studying how to arrange this laminate in a container as a leak detection sensor for an organic solvent, the present invention was completed.

Therefore, the container for a lithium battery of the present invention comprises at least a part of the container or the outside of the container.
A layer containing a polymer as a solid electrolyte precursor, which functions as an electrolyte when swelled by an organic solvent in the organic electrolyte and changes in conductivity before swelling, and a pair of electrode layers sandwiching this layer And a leakage detection sensor is formed of a laminate having the following.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 (a) and 1 (b) which show an embodiment of the present invention. As shown in these figures, the lithium battery container 1 of this example is
For example, it is used to form a large-sized lithium secondary battery having a capacity of 50 to 1000 Ah, and the whole is formed in a flexible bag type in a laminate 11 as a leak detection sensor. .

As described above, the laminated body 11 includes a layer (hereinafter, referred to as a “sensor layer”) 11 a containing a polymer as a solid electrolyte precursor, and a pair of electrode layers 11 b sandwiching the sensor layer 11 a. , 11c. The sensor layer 11 of the laminate 11
As the polymer that is a precursor of the solid electrolyte contained in a, the above-mentioned PAN is preferably used, and polyethylene oxide (PEO), polyvinyl pyrrolidone (PVP), polyvinylidene chloride (PVdC), Polyvinylidene fluoride (PVdF) and polytetraethylene glycol diacrylate (PEGDA) can also be used.

These can be used alone or in combination of two or more having compatibility.
Further, the sensor layer 11a may be formed of a mixture of the above polymer and another polymer having compatibility with the polymer, but in consideration of the function of detecting leakage of the organic solvent described above, It is preferable to form the above polymer alone (one or two or more).

The thickness of the sensor layer 11a is not particularly limited, but is preferably about 5 to 20 μm.
More preferably, it is about 0 to 15 μm. If the thickness of the sensor layer 11a is less than the above range, the conductivity of the layer in a state where the organic solvent is not swollen increases, and the difference from the swollen state becomes small, so that the accuracy of detection may decrease. There is. Conversely, when the value exceeds the above range, the conductivity of the sensor layer 11a in a state in which the organic solvent is swollen is reduced, and the difference from the state in which the organic solvent is not swollen is reduced. May decrease.

As the conductive material for forming the electrode layers 11b and 11c, a metal is preferably used because it has an effect of preventing the permeation of moisture and an organic solvent and suppressing the deterioration of the battery. Is done. Examples of the metal include aluminum, nickel, stainless steel, titanium, and the like, which have excellent resistance to organic electrolytes. In particular, the overall lithium battery container 1, and thus the large lithium secondary battery as described above, is generally used. In consideration of weight reduction, aluminum is particularly preferably used among the above.

The thickness of the electrode layers 11b and 11c is not particularly limited, but the outer electrode layer 11b in particular keeps the shape of the battery container 1 and reliably prevents moisture from entering the inside from the outside of the container. About 100-6
It is preferably about 00 μm. However, the electrode layer 11
outside the electrode layer 11b, while protecting the electrode layer 11b,
Maintaining the shape of the battery container 1 while ensuring the flexibility of the bag body,
In addition, a surface layer made of a resin such as polyethylene terephthalate (PET) may be laminated in order to print the name, product name, rating, precautionary statement, etc. of the lithium secondary battery. In this case, the electrode layer 11b Has a thickness of 1
It may be 00 μm or less.

Further, the inner electrode layer 11c is
In a normal state where the sensor layer 1 is not damaged,
1a is preferably about 5 to 20 μm in order to prevent swelling by contact with the gas of the electrolytic solution or organic solvent in the battery container 1. In the normal state where the battery case 1 is not damaged, the organic solvent in the electrolytic solution permeates the battery case 1 to swell the sensor layer 11a inside the electrode layer 11c as described above, or In order to more reliably prevent leakage to the outside of the container, a layer of an olefin-based resin such as polyethylene or polypropylene having an excellent property of preventing the permeation of the organic solvent may be laminated. However, the olefin-based resin layer is, as described above, an electrode layer 11 formed of a metal such as aluminum.
Since the thermal adhesiveness with c is not so good, it is preferable to laminate not directly on the inside of the electrode layer 11c but via an adhesive layer made of a resin such as PET, which has excellent thermal adhesiveness of both layers, for example. preferable.

At least one of the resin layers among the layers constituting the laminate 11 contains, for example, a combined system of hydrotalcite and magnesium sulfate as a collecting agent for collecting moisture and Lewis acid. Is also good. Further, a resin layer containing the above-described collecting agent for collecting moisture and Lewis acid may be stacked further inside the innermost layer of the stacked body. The layer of such a resin is preferably formed of an olefin-based resin in consideration of the resistance to an organic electrolytic solution.

When the above-mentioned hydrotalcite and magnesium sulfate are used in combination, the amount of the collector is about 1 to 50 parts by weight based on 100 parts by weight of the resin constituting the layer. Is preferred. If the amount of the collecting agent is less than the above range, the effect of collecting the moisture and Lewis acid may be insufficient due to the addition of the collecting agent. In this case, the flexibility of the battery container 1 may be reduced.

The laminate 11 having the above-described layers is continuously manufactured by, for example, a conventionally known heat laminating method. Further, the battery container 1 is formed by cutting the laminate 11 into a predetermined developed shape, assembling the laminate into a three-dimensional shape, and thermally bonding the joints. In the formed battery case 1, for example, if a part of the battery case 1 is damaged due to the above-mentioned contact accident or the like, the organic electrolytic solution or the vaporized organic electrolytic solution is formed by the inner electrode layer 11c at the place where the damage occurred. The sensor layer 11a, which has been shielded from the organic solvent gas, swells in contact with these liquids and gases, and its electrical conductivity increases as described above.

If the increase in conductivity is detected by the pair of electrode layers 11b and 11c, it is detected that a liquid leak or a gas leak has occurred, thereby preventing the danger of ignition or explosion. It is possible to do. In the battery case 1, there are various methods for detecting a change in conductivity due to swelling of the sensor layer 11a by the pair of electrode layers 11b and 11c.
When the conductivity between b and 11c (that is, the conductivity of the sensor layer 11a) exceeds a preset threshold,
For example, it is preferable to provide a circuit for turning on a warning lamp or emitting a warning sound as a means for intuitively informing a user of a liquid leak or a gas leak.

In the lithium secondary battery of the example shown in the figure using the battery container 1, an electrode laminate 2 impregnated with a non-aqueous organic electrolyte is accommodated in the battery container 1. Only the connection terminals 3 that are electrically connected to the respective electrodes constituting the electrode laminate 2 are sealed by heat sealing or the like in a state of protruding upward. Among them, as the electrode laminate 2 and the non-aqueous organic electrolytic solution, any of those similar to conventional lithium secondary batteries can be used.

That is, the electrode laminate 2 is configured by alternately laminating a plurality of sheet-like positive electrodes and cathodes via a porous separator, and the positive electrode and the cathode are respectively
It is formed by applying a paste containing a powder of a positive electrode active material or a negative electrode active material and a resin binder to one or both surfaces of a metal foil as a current collector, followed by drying and pressing.

As the metal foil, any of various metal foils having excellent conductivity and excellent resistance to an organic electrolyte can be used. Examples of such a metal include aluminum, nickel, copper, stainless steel, titanium, and the like. In view of the performance of the lithium secondary battery 2 in particular, a combination of aluminum for the positive electrode and copper for the negative electrode is preferably used. . The size and shape of the metal foil are appropriately set according to the shape, structure and size of the lithium secondary battery 2.

As the positive electrode active material, for example, a general formula: LiAl _x Co _y Ni _1-xy O ₂ [0 ≦ x ≦ 0.3, 0 ≦ y ≦ 1, 0 ≦ x + y ≦ 1] or a general formula: Examples thereof include oxides of transition metals containing or not containing lithium, such as LiCr _n Mn _2-n O ₄ [0 ≦ n ≦ 2], sulfides such as iron sulfide, and selenides. On the other hand, as the negative electrode active material, for example, porous carbon capable of reversibly doping and undoping lithium ions, such as coke, fired resin, carbon fiber, pyrolytic carbon, natural graphite, and mesophase spheres, is preferably used. In addition, an oxide of a transition metal such as Li _4/3 Ti _5/3 O ₄ can also be used.

As the resin binder, for example, fluororesins such as polyvinylidene fluoride (PVdF), polytetrafluoroethylene (PTFE) and fluororubber are preferably used because of their excellent resistance to non-aqueous organic electrolytes. You. As the organic electrolyte, for example, propylene carbonate or ethylene carbonate, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, tetrahydrofuran, or the like has a high relative dielectric constant and swells the sensor layer 11a. At that time, to an organic solvent that can reduce its conductivity,
A liquid in which lithium ions such as LiClO ₄ , LiBF ₄ , LiPF ₆ , and LiAsF ₆ or a solid electrolyte having lithium ion conductivity are dissolved or dispersed is used.

Although only one connection terminal 3 is shown in the drawing, it is needless to say that two connection terminals 3 are provided for both positive and negative electrodes. In the case of the drawing, another connection terminal is arranged behind the connection terminal 3 shown in the figure. In addition, in the battery container 1, together with the electrode laminate 2, the organic electrolyte, and the connection terminal 3, a trapping agent for trapping moisture and Lewis acid, such as the above-described hydrotalcite or magnesium sulfate, is sealed. Is also good.

The above-described positive electrode active material used in the above-mentioned lithium secondary battery greatly expands during charge and discharge.
It is known to shrink, the positive electrode active material powder, using a resin binder as described above, in the positive electrode of the structure bonded to the surface of the metal foil as a current collector, the bonding structure, By repeating the above expansion and contraction, the resistance value is loosened and the resistance value is increased, whereby the cycle life of charge and discharge may be shortened.

The expansion and contraction are caused by the electrode laminate 2 described above.
In this case, the electrode laminate 2 and the lithium secondary battery appear as expansion and contraction mainly in the directions indicated by black arrows in the figure. Therefore, in the lithium secondary battery shown in the figure provided with the flexible bag-type battery container 1 as described above, the expansion and shrinkage are suppressed to prevent the loosening of the positive electrode and the reduction in the cycle life associated therewith. For this purpose, for example, as shown in the figure, it is preferable to use the lithium secondary battery in a state where the lithium secondary battery is housed in a box 4 having a slightly larger inner dimension than the battery container 1 or in a hole. This way,
The rigidity of the box body 4 and the holes function as the pressing means for suppressing the expansion of the electrode laminate 2, so that the above-described loosening of the positive electrode is suppressed, and a decrease in the cycle life of the battery is prevented.

The upper opening of the box 4 should be made to protrude upward only by the connection terminal 23 and be closed by the lid 41, as shown by the two-dot chain line in the figure. This is preferable in terms of delaying ignition or the like when occurrence occurs. For example, in the case of an electric vehicle or the like, the portion serving as the box body 4 may be previously incorporated in a structure such as a chassis or a body. In addition, for small-scale power storage in households, stores, small factories, etc.,
The above-mentioned hole may be formed in the building, under the floor, on the wall surface or in the attic.

As the pressing means for suppressing the expansion of the electrode laminate 2, for example, a combination of a thin leaf spring disclosed in Japanese Patent Application Laid-Open No. Hei 10-334879 and a flat pressing plate slightly thicker than that is used. May be used. Such a pressing means may be used by inserting it into the gap between the lithium secondary battery and the box or the hole. In this case, since the thin leaf spring also functions as a buffer, the structure of the box is particularly simplified. There is an advantage that can be made.

As another pressing means, for example, a means combining a pressing plate with a coil spring or a disc spring, or a means combining active parts such as an air cylinder or a motor, although the apparatus is large-scale, is also used. It is possible. Alternatively, the lithium secondary battery is not arranged vertically as shown in the figure, but is arranged horizontally so that the electrodes constituting the electrode stack 2 are oriented horizontally, and a weight is placed thereon as a pressing means. May be.

The bag-type battery container 1 has a sensor layer 11a and an electrode layer 11b sandwiching the sensor layer 11a, as shown in FIG.
It is not necessary to be formed by the laminate 11 with 11c,
Only a part thereof, for example, only a portion where the corner of the electrode laminate 2 is likely to be broken by hitting the corner may be formed by the laminate 11 as a leak detection sensor. Other parts are, for example, an olefin-based resin layer having excellent organic solvent permeation resistance as described above on the inner side in contact with the organic electrolyte solution, and water permeation prevention on the outer side thereof through an adhesive layer such as PET. It may be formed by stacking three layers of a metal layer such as aluminum having excellent properties, and further forming a four-layer structure in which a surface layer such as PET is stacked on the outside thereof.

The entire bag-type battery container 1 is formed of the above-described four-layered laminated body or the like, and the sensor layer 11a and the electrode sandwiching the sensor layer 11a are disposed at the outside of the bag-like battery container 1 at the above-mentioned fragile locations. The laminate 11 with the layers 11b and 11c may be arranged as a leak detection sensor. Further, in the case where the laminate 11 as the leak detection sensor is disposed outside the container in this manner, the advantage of reducing the weight of the battery is eliminated by forming the container into a flexible bag type as described above. However, the container itself may be formed of a rigid box as in the prior art, or disclosed in Japanese Patent Application Laid-Open No. 10-334879.
A configuration of a box body in which a pressing means is disposed may be adopted.

Various other design changes can be made without changing the gist of the present invention.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. Example 1 <Production of bag-type container>
A three-layer structure having a layer configuration shown in FIG. 1B, in which an aluminum electrode layer 11b of μm, a sensor layer 11a of PAN having a thickness of 12 μm, and an electrode layer 11c of aluminum having a thickness of 9 μm are laminated in this order. The laminated body 11 was produced.

The laminated body 11 cut into a predetermined developed shape is assembled in a three-dimensional shape such that the electrode layer 11c is on the inner side, and the joints are thermally bonded to form a substantially box shown in FIG. 25cm long, 22cm wide, 25c high
m was prepared. <Preparation of positive electrode> LiCoO ₂ powder 1 as positive electrode active material
00 parts by weight, 10 parts by weight of graphite, PVdF10
Parts by weight, and N-methyl-2-pyrrolidone was added to form a paste.
mm aluminum foil on both sides and dried. Then roll cut and cut, 0.18m thick
m, a positive electrode having a length of 200 mm and a width of 200 mm was prepared.

<Preparation of Negative Electrode> 20 parts by weight of PVdF was mixed with 100 parts by weight of flaky natural graphite powder as an anode active material, and N-methyl-2-pyrrolidone was added to form a paste. It was applied to both sides of a copper foil of 0.02 mm and dried. Then roll cut and then cut, thickness 0.28mm, length 200mm, width 2
A 00 mm negative electrode was produced.

<Manufacture of Lithium Secondary Battery> The positive electrode and the negative electrode prepared as described above were
m, 200 mm wide polypropylene microporous membrane as separator, positive electrode-separator-negative electrode-separator -...
In this order, a total of 360 sheets were laminated to obtain an electrode laminate 2. Next, when the electrode laminate 2 was accommodated in the battery container 1, a mixture of ethylene carbonate and diethyl carbonate at a volume ratio of 1: 1 was added to the mixture as an electrolyte using LiPF _4.
A non-aqueous organic electrolytic solution (electrolyte concentration: 1 M) in which is dissolved is injected and impregnated under a reduced pressure of 400 mmHg for 96 hours, and a positive electrode connecting terminal 3 is connected to each positive electrode constituting the electrode laminate 2, The connection terminal 3 for a negative electrode was connected to the negative electrode, respectively.

Finally, the mouth of the bag-shaped container 1 was sealed by heat sealing using polyethylene as an insulating resin with the connection terminals 3 protruding upward, thereby producing a lithium secondary battery. . <Battery characteristics test> The lithium secondary battery manufactured above was
Formed by an aluminum plate with a thickness of 4 mm, which itself also serves as a pressing means, the inner dimension is 26 cm long, 23 cm wide,
It was accommodated in a box 4 having a depth of 26 cm.

In this storage state, the battery container 1
A pair of electrode layers 11b and 11c of the laminated body 11 constituting
While measuring the electrical conductivity between the lithium secondary batteries, the initial current density of the above lithium secondary battery was 0.15 mA / cm ² , and the upper limit voltage was 4.
After performing a constant current and constant voltage charge at a charge condition of 1 V for 8 to 10 hours and a constant current discharge to 3.0 V under a discharge condition of a current density of 0.15 mA / cm ² , 120 cycles were repeated. , Cycle start is 10
^-6 S / cm, the end time was 3 × 10 ^-6 S / cm, and there was almost no change in the middle.

From this, it is ensured that the sensor layer 11a swells in contact with the gas of the electrolytic solution or the organic solvent by the inner electrode layer 11c in the normal use state where the battery case 1 is not damaged. It was found that no malfunction occurred because of the prevention. Then, a hole having a diameter of 0.05 mm was made to penetrate the battery container 1 only at one location using a needle, and again the conductivity between the pair of electrode layers 11b and 11c was measured. When the cycle was repeated under the conditions, the conductivity started to increase sharply immediately after the restart of the cycle, and the electrical conductivity started 30 cycles after the restart (15 times from the beginning).
In the 0th cycle), it increased to 0.00005 S / cm.

FIG. 2 shows the above results. From the results in the figure,
For example, conductivity 0.00001 to 0.00002 S / c
It has been confirmed that by providing a threshold value at a position of about m, it is possible to detect leaking of the electrolytic solution and gas leaking of the vaporized organic solvent at an early stage.

[0047]

As described in detail above, according to the present invention,
The present invention has a specific operation and effect that a lithium battery container capable of continuously and easily and reliably detecting leakage of an organic electrolytic solution, gas leakage of an organic solvent, and the like, which may cause ignition or explosion.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an example of a lithium secondary battery using an example of an embodiment of a lithium battery container of the present invention, and FIG. It is an expanded sectional view of the laminated body which comprises.

FIG. 2 shows a charge / discharge cycle according to an embodiment of the present invention;
4 is a graph showing a relationship between a change in conductivity between a pair of electrodes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lithium battery container 11 Laminated body (leakage detection sensor) 11a Sensor layer 11b, 11c Electrode layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Ujiie 3-3-22 Nakanoshima, Kita-ku, Osaka City Inside Kansai Electric Power Co., Inc. (72) Eriko Yagasaki 3-2-2, Nakanoshima, Kita-ku, Osaka Kansai F-term (Reference) in Electric Power Co., Ltd. 5H011 AA12 CC01 CC06 CC10 FF02 5H029 AJ12 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 DJ02 EJ01 EJ12 5H030 AA07 AS08 FF41

Claims (4)

[Claims] 1. A container for a lithium battery using a non-aqueous organic electrolytic solution, wherein at least a part of the container or the outside of the container is used as an electrolyte when swollen by an organic solvent in the organic electrolytic solution. A layer containing a polymer as a precursor of a solid electrolyte, and a layer containing a pair of electrode layers sandwiching this layer,
A lithium battery container comprising a leak detection sensor. 2. The polymer as a precursor of the solid electrolyte, wherein the polymer is at least one selected from the group consisting of polyethylene oxide, polyacrylonitrile, polyvinylpyrrolidone, polyvinylidene chloride, polyvinylidene fluoride, and polytetraethylene glycol diacrylate. The lithium battery container according to claim 1, wherein 3. The lithium battery container according to claim 1, wherein the whole is formed in a flexible bag shape from the laminate. 4. The lithium battery container according to claim 1, which is used for a large lithium secondary battery having a capacity of 50 to 1000 Ah.