JP2000188114A - Manufacture of nonaqueous electrolyte battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To productively manufacture a nonaqueous electrolyte battery. SOLUTION: In a manufacturing method for a nonaqueous electrolyte battery equipped with an electrode forming body having an insulating electrolyte penetrating body placed between a positive electrode and a negative electrode, the insulating electrolyte penetrating body is formed by either a crystalline polymer having a fusing point of 150 deg.C or a noncrystal polymer having a glass transition temperature of 150 deg.C, the insulating electrolyte penetrating body is dried at a temperature of at least 80 deg.C, and the electrode forming body having the dried insulating electrolyte penetrating body is immersed in nonaqueous electrolyte. In this manufacturing method, the insulating electrolyte penetrating body can be dried in a short time without lowering its performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a separator for separating a positive electrode and a negative electrode, and a method for manufacturing a non-aqueous electrolyte battery provided with at least one of a porous film formed on at least one surface of the positive electrode and the negative electrode. In particular, it relates to a method for manufacturing a lithium battery.

[0002]

2. Description of the Related Art In recent years, high performance secondary batteries have been actively developed as batteries for portable electronic devices and automobiles. Such a secondary battery is required to have a large capacity and a high output while being small and lightweight, that is, a high energy density and a high output density. Also, since secondary batteries store high energy, it is important to ensure safety. Further, in order to widely spread the secondary battery in the market, it is important to improve the productivity.

[0003] As such a secondary battery, there is a lithium secondary battery including a positive electrode and a negative electrode capable of releasing and occluding lithium ions, and an electrolytic solution interposed between the electrodes. In particular, for a lithium ion secondary battery in which a negative electrode active material made of a carbon material is used for the negative electrode,
Because of its long service life and high safety, it is expected to be used for batteries of portable electronic devices and automobiles as being practically excellent.

[0004] In many batteries, an insulating and porous separator as disclosed in JP-A-7-65816 is interposed between a positive electrode and a negative electrode as an insulating electrolyte permeable material. There is also a battery in which a porous film is integrally formed on at least one surface of a positive electrode and a negative electrode. Such a separator or porous film can prevent a short circuit between the positive electrode and the negative electrode while allowing the electrolyte (supporting salt) to move between the positive electrode and the negative electrode.

In a non-aqueous electrolyte battery such as a lithium secondary battery or a lithium primary battery, in which the active material of the electrode easily reacts with water, if water exists in the electrode, the water reacts with the active material. However, there is a possibility that the battery performance is reduced. Therefore, when manufacturing a non-aqueous electrolyte battery, it is preferable to manufacture the battery so that water is not present in the electrodes as much as possible.

Therefore, when manufacturing a battery provided with an insulating electrolyte permeable material, conventionally, the electrode is dried in a high-temperature atmosphere using a vacuum dryer or the like, and then the electrode and the insulating electrolyte permeable material are dried in a dry room. It was wound or laminated and assembled in the battery case. Thus, the battery can be manufactured so that the electrode does not contain moisture.

[0007]

On the other hand, if the insulating electrolyte permeable body contains moisture, the moisture may move to the electrode and react with the active material of the electrode. Therefore, when manufacturing a non-aqueous electrolyte battery, it is preferable to manufacture the battery by drying the insulative electrolyte permeation material in the same manner as the electrodes so that moisture is not present in the insulative electrolyte permeation material as much as possible.

However, since the conventional insulating electrolyte permeable material is made of polyethylene or the like, if it is dried at a high temperature, there is a problem that its performance is reduced due to shrinkage and melting. Therefore, the insulative electrolyte permeable body made of polyethylene or the like must be dried at a relatively low temperature. However, since the insulating electrolyte permeation body is porous, it is difficult to dry, and it takes time to dry at a relatively low temperature. As a result, it takes a lot of time to manufacture the battery, and it becomes impossible to manufacture a nonaqueous electrolyte battery with high productivity.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of manufacturing a nonaqueous electrolyte battery capable of manufacturing a nonaqueous electrolyte battery with high productivity.

[0010]

A method for manufacturing a non-aqueous electrolyte battery according to the present invention comprises a positive electrode, a negative electrode, and an insulating electrolyte permeant disposed between the positive electrode and the negative electrode and permeable to a non-aqueous electrolyte. The method of manufacturing a non-aqueous electrolyte battery provided with an electrode structure having the following structure: the insulating electrolyte permeable body is made of a crystalline polymer having a melting point of at least 150 ° C and at least 15
The insulating electrolyte permeable material is formed from at least one of amorphous polymers having a glass transition temperature of 0 ° C, and the insulating electrolyte permeable material is dried at a temperature of at least 80 ° C, and the dried insulating electrolyte permeable material is dried. And dipping the electrode assembly having the above structure in the non-aqueous electrolyte.

In the method of manufacturing a non-aqueous electrolyte battery, the insulating electrolyte permeant may include at least one of a crystalline polymer having a melting point of at least 150 ° C. and an amorphous polymer having a glass transition temperature of at least 150 ° C. Since it is formed from a polymer, even if the insulating electrolyte permeable material is dried at a temperature of at least 80 ° C., no shrinkage or melting occurs. Incidentally, conventional polyethylene shrinks at 80 ° C. Further, at a high temperature of at least 80 ° C., the moisture easily evaporates, so that the insulative electrolyte permeant can be dried very effectively, and can be dried in a short time. Therefore, according to the present invention, the insulating electrolyte permeable body can be dried in a short time without deteriorating its performance.

In the present invention, since the electrode assembly having the insulating electrolyte permeable material thus dried is immersed in a non-aqueous electrolyte, the non-aqueous electrolyte is not required to be maintained under the dry condition. The liquid prevents moisture from adhering to the insulating electrolyte permeable body (electrode structure). Further, the present invention is characterized in that the electrode structure in a state where the insulating electrolyte permeable body is disposed between the positive electrode and the negative electrode is exposed to an atmosphere of at least 80 ° C., and the electrode structure is dried. According to this, the positive electrode, the negative electrode, and the insulating electrolyte permeable body can be dried at the same time.

Further, the present invention is characterized in that the battery is dried as described above in a state where the electrode assembly is housed in a battery case. According to this, the battery case can be dried at the same time. As a result, the insulative electrolyte permeant or the electrode structure can be dried in a short time, so that a non-aqueous electrolyte battery can be manufactured with high productivity.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the insulating electrolyte permeable body may be a separator provided between a positive electrode and a negative electrode, or a porous material formed on at least one surface of the positive electrode and the negative electrode. It may be a porous film. The polymer used for such an insulating electrolyte permeant may be any one of a crystalline polymer having a melting point of 150 ° C. or higher and an amorphous polymer having a glass transition temperature of 150 ° C. or higher. Is not particularly limited, and a known polymer material can be used.

For example, polybenzimidazole, polyimide, polyetherimide, polyamideimide, polyphenylene ether (polyphenylene oxide), polyarylate, polyacetal, polyphenylene sulfide, polyether sulfone, polysulfone, polyether ketone, polybutylene terephthalate, polyethylene It is preferable to use at least one of terephthalate, polyethylene naphthalate, ethylene-cycloolefin copolymer, polyvinylidene fluoride and its copolymer. At a temperature of 150 ° C. or higher, these polymer materials are heat-resistant polymers that hardly undergo deformation such as heat shrinkage and hardly cause oxidative decomposition. Therefore, if these thermoplastic polymers are used as the material of the insulative electrolyte permeant, a material having extremely high heat resistance at a drying temperature of 80 ° C. or higher can be obtained, and the shutdown function can be effectively operated. You get what you can. Further, since these polymer materials are also thermoplastic polymers, an insulating electrolyte permeable body can be easily formed.

Further, in order to further improve the mechanical strength of the insulating electrolyte permeable body, inorganic fibers such as glass fiber and carbon fiber, and polymer fibers such as aramid, polyphenylene sulfide, and polyester may be added. The thickness of the insulating electrolyte permeable material is appropriately selected so as to obtain desired battery performance. Further, a plurality of types of insulating electrolyte permeants made of different heat resistant polymers among the above heat resistant polymers may be used in combination.

The method for forming the insulative electrolyte permeable body is not particularly limited, but for example, the following embodiment can be used. That is, for the separator interposed between the positive electrode and the negative electrode, the formation method of the following Example 1 can be used, and for the porous film formed on at least one surface of the positive electrode and the negative electrode, The forming method of Example 2 can be used.

On the other hand, at least 8
Means for drying at a temperature of 0 ° C. is not particularly limited, and a known drying means can be used.
For example, a hot air drier, a thermostat, a vacuum drier, or the like can be used. The drying time is not particularly limited, either, and is appropriately selected before drying according to the amount of water contained in the electrode and the insulating electrolyte permeable material.

On the other hand, since the insulating electrolyte permeable body retains the heat obtained at the time of drying until the insulating electrolyte permeable body is immersed in the electrolytic solution, the insulating electrolyte permeable body is in an atmosphere containing moisture such as air. Even when exposed to water, it is possible to prevent moisture from adhering to them due to the retained heat. In particular, during this time, if the atmosphere of the insulating electrolyte permeable body is in a dry state, the adhesion of moisture to the insulating electrolyte permeable body is completely prevented. Therefore, the operation of immersing the electrode assembly in the electrolytic solution is preferably performed continuously in a device where the electrode assembly is dried or in a dry room.

After drying the insulating electrolyte permeable material,
If the battery cannot be immediately assembled in the battery case, it may be immersed separately from the battery case in an electrolyte tank containing a non-aqueous electrolyte. During this time, even if the electrolytic solution tank is placed in an atmosphere containing moisture, the non-aqueous electrolytic solution in the electrolytic solution tank prevents moisture contained in the atmosphere from adhering to the insulating electrolyte permeable body. . That is, in the electrolyte prepared outside the battery case, it is possible to keep the insulating electrolyte permeable body from adhering moisture. Therefore, when storing the dried electrode assembly outside the battery case without using it immediately, it is necessary to store the electrode assembly in a dry environment so that moisture does not adhere to the electrode assembly. Will be able to do it.

After that, the electrode structure having the insulating electrolyte permeable body is assembled into the battery case while the atmosphere is kept in a dry state, and the non-aqueous electrolyte solution is injected into the battery case. Alternatively, the electrode structure may be assembled to the battery case after the non-aqueous electrolyte is injected into the battery case. In the present invention, the electrode structure in a state where the insulating electrolyte permeable body is disposed between the positive electrode and the negative electrode is exposed to a temperature atmosphere of at least 80 ° C., and the positive electrode of the electrode structure, the negative electrode, It is preferable that the insulating electrolyte permeants are simultaneously dried. By drying the insulating electrolyte permeable body at the same time as the electrodes, the insulating electrolyte permeable body can be efficiently dried. That is, the electrode drying step does not need to be performed separately from the insulating electrolyte permeation body drying step, so that the battery manufacturing time can be further shortened, and the battery productivity can be improved.

Further, in the present invention, it is preferable that a battery case accommodating the electrode assembly is provided, and the electrode assembly be dried while the electrode assembly is accommodated in the battery case. According to this method, the inside of the battery case can be dried at the same time, so that the insulating electrolyte permeable body can be efficiently dried. That is, the step of drying the inside of the battery case does not have to be performed separately from the step of drying the insulative electrolyte permeable body and the electrode, so that the battery manufacturing time can be further shortened and the productivity of the battery is improved. be able to.

The type of the non-aqueous electrolyte battery manufactured in the present invention is not particularly limited, and any known non-aqueous electrolyte battery can be manufactured. In particular, a non-aqueous electrolyte battery, such as a lithium battery such as a lithium primary battery or a lithium secondary battery, which may not be able to obtain excellent battery performance when moisture is present in the electrode, is preferable. As the lithium secondary battery, lithium (Li)
And a positive electrode capable of releasing the Li in the form of ions at the time of charging, absorbing the Li ions at the time of discharging, and a carbon material, absorbing the Li ions at the time of charging, and discharging the Li ions at the time of discharging. It is preferable that the lithium ion secondary battery includes a negative electrode that can be released and a non-aqueous electrolyte prepared by dissolving a supporting salt containing Li in an organic solvent.

In this case, a known positive electrode active material can be used as the positive electrode active material, but it is preferable to use a composite oxide of lithium and a transition metal such as LiMn ₂ O ₄ . A known carbon material can be used as the carbon material of the negative electrode, and among them, a material made of natural graphite or artificial graphite having high crystallinity is preferable. By using such a highly crystalline carbon material, the efficiency of inserting and extracting lithium ions in the negative electrode can be improved.
Further, an oxide, a sulfide, or the like may be used as an active material in addition to the carbon material.

Further, it is preferable to use an electrode in which an active material layer containing an active material is formed on a current collector for both the positive electrode and the negative electrode. Known nonaqueous electrolytes can also be used. In particular, it is preferable to use a non-aqueous electrolyte in which a lithium salt such as LiPF ₆ is dissolved in an organic carbonate-based organic solvent such as ethylene carbonate.

The structure of the electrode is not particularly limited either. For example, a plate-like positive electrode plate and a negative electrode plate are alternately laminated (laminated type), or a band-like positive electrode plate and a negative electrode plate are stacked. Any known structure such as a wound type (winding type) may be used. In such a laminated battery or a wound battery, before the electrodes are laminated or wound together with the insulating electrolyte permeable material, both are together at a temperature of 80 ° C. or higher and a temperature lower than the melting point or the glass transition temperature. May be immersed in an electrolytic solution after lamination or winding, but after laminating or winding the electrode together with the insulating electrolyte permeable body, the electrode and the insulating electrolyte permeable body are at 80 ° C. or higher, and It is preferable to dry at a temperature lower than the melting point or the glass transition temperature and then immerse in an electrolyte solution. By performing the drying in this manner, the electrode and the insulating electrolyte permeable body can be efficiently dried.

[0027]

The present invention will be described below in detail with reference to examples. (Example 1) In this example, a wound lithium ion secondary battery in which a separator was interposed between a positive electrode and a negative electrode as an insulative electrolyte permeable material was manufactured as follows. [Formation of Separator] A separator composed of polyphenylene ether and having dense pores having a small pore diameter was formed as follows. Note that polyphenylene ether is an amorphous thermoplastic polymer having a glass transition temperature of 150 ° C. or higher.

First, polyphenylene ether (NOLYL PPO534, manufactured by GE Plastics) was prepared.
This polyphenylene ether / lithium bistrifluoromethylsulfonylimide was dissolved in NMP at a predetermined ratio to obtain a mixture. Further, a polyester film was prepared as a substrate, and the mixture was applied to the polyester film at a predetermined thickness using a blade coater to form a mixture layer on the substrate.

Next, the mixture layer was immersed in isopropyl alcohol for a predetermined period of time together with the substrate. In addition, isopropyl alcohol is a poor solvent for polyphenylene ether.
As a result, polyphenylene ether was precipitated in the mixture layer. At this time, the mixture layer was separated from the substrate. Subsequently, the mixture layer was dried using a hot air drier. As a result, the solvent in the mixture layer was evaporated, and the mixture layer became porous. Thus, a porous separator made of polyphenylene ether was obtained. [Production of Lithium Secondary Battery] While the separator was formed as described above, the positive electrode was formed as follows.

First, LiMn ₂ O ₄ powder was prepared as a positive electrode active material. In addition, graphite powder (KS-15, manufactured by Lonza) was prepared as a conductive material, and polyvinylidene fluoride (PVDF) was prepared as a binder. N-methyl-2-pyrrolidone (NMP) was prepared as a dispersion solvent.
These LiMn ₂ O ₄ powder, carbon powder and PVDF were added to NMP at a predetermined ratio and mixed well to obtain a slurry-like positive electrode mixture. Next, a sheet-shaped positive electrode current collector made of aluminum was prepared, and a positive electrode mixture was applied on the surface of the positive electrode current collector at a predetermined coating thickness. The coated positive electrode mixture was sufficiently dried in a high-temperature bath, and then pressed to a predetermined density to form a positive electrode active material layer.

Thus, a positive electrode comprising the positive electrode current collector and the positive electrode active material layer formed on the surface of the positive electrode current collector was formed. On the other hand, a negative electrode was formed as follows.
First, mesophase carbon microbead (MCMB) powder was prepared as a negative electrode active material, and this MCMB and PVDF as a binder were added to NMP at a predetermined ratio to NMP, and mixed well to obtain a slurry-like negative electrode mixture. . Then
A plate-shaped negative electrode current collector made of copper was prepared, and a negative electrode mixture was applied on the surface of the negative electrode current collector at a predetermined coating thickness. The applied negative electrode mixture was sufficiently dried in a high-temperature bath, and then pressed to a predetermined density to form a negative electrode active material layer. Thus, a negative electrode including the negative electrode current collector and the negative electrode active material layer formed on the surface of the negative electrode current collector was formed.

The positive electrode and the negative electrode obtained as described above were overlapped with the previously formed separator interposed therebetween, and were wound a predetermined number of times to form an electrode wound body. The wound electrode body was inserted into a cylindrical bottomed battery case and assembled. Meanwhile, an electrolytic solution was prepared as follows. Ethylene carbonate and diethyl carbonate were mixed at a predetermined ratio, respectively, to obtain an organic solvent. LiPF is used as a supporting salt in this organic solvent.
₆ was dissolved at a concentration of 1 mol / liter to prepare an electrolytic solution.

Next, a battery was assembled according to the procedure shown in FIG. First, a vacuum dryer provided with a vacuum chamber capable of maintaining a high vacuum and capable of heating the inside of the vacuum chamber at a temperature of 120 ° C. or higher was prepared, and a battery case with an electrode wound body was installed in the vacuum chamber. After the inside of the vacuum chamber was evacuated to 1 Torr or less, the inside of the vacuum chamber was heated to 120 ° C., and the wound electrode body was dried together with the battery case for 8 hours.

Subsequently, dry air was introduced into the vacuum chamber to bring the inside of the vacuum chamber to normal pressure, and then the previously prepared electrolytic solution was injected into the battery case. A cover was attached to the battery case, and caulking was performed to seal the inside of the battery case. Thus, a wound lithium secondary battery in which the separator was interposed between the positive electrode and the negative electrode was completed. Comparative Example 1 As a separator, a separator made of polyethylene (product No. SE manufactured by Tonen Tapils Co., Ltd.)
A wound lithium secondary battery was produced in the same manner as in Example 1 except that TERA E25MMS) was used. Comparative Example 2 A positive electrode and a negative electrode were formed and an electrolyte was prepared in the same manner as in Example 1. Next, using the same separator as in Comparative Example 1, a battery was assembled according to the flow of the procedure shown in FIG.

The same vacuum dryer as that used in Example 1 was prepared, and the positive electrode and the negative electrode were set in a vacuum chamber. After the inside of the vacuum chamber was evacuated to 1 Torr or less, the inside of the vacuum chamber was heated to 120 ° C., and the positive electrode and the negative electrode were dried for 8 hours. Then, in the dry room,
A predetermined number of turns of the positive electrode, the negative electrode, and the separator were wound so that the separator was interposed between the positive electrode and the negative electrode, to form an electrode wound body.

After inserting this electrode wound body into a cylindrical bottomed battery case, the previously prepared electrolytic solution was injected into the battery case. Finally, a lid was attached to the battery case, and caulking was performed to seal the inside of the battery case. Thus, a wound lithium secondary battery in which the separator was interposed between the positive electrode and the negative electrode was completed. (Example 2) In this example, a wound lithium ion secondary battery in which a porous film was formed on the surface of a negative electrode as an insulative electrolyte permeant was manufactured as follows.

The positive electrode was formed in the same manner as in Example 1.
On the other hand, the negative electrode was formed as follows. First, MCMB powder was prepared as a carbon material, and mixed well with PVDF at a predetermined ratio with a predetermined amount of NMP to obtain a paste-like negative electrode mixture. Next, this negative electrode mixture was applied to a copper foil using a blade coater. The applied negative electrode mixture was dried in a high-temperature bath to volatilize and remove NMP in the mixture, thereby solidifying the mixture. Lastly, the solidified negative electrode mixture was press-formed so as to have a predetermined density to form a negative electrode active material layer.

Next, polyphenylene ether / lithium bistrifluoromethylsulfonylimide was dissolved in NMP to obtain a mixture. This mixture was applied on the surface of the negative electrode active material layer using a blade coater to form a mixture layer on the negative electrode active material layer. This mixture layer was immersed in an isopropyl alcohol solution for a predetermined time, together with the negative electrode active material layer and the current collector. As a result, polyphenylene ether was uniformly deposited in the mixture layer.

This mixture layer was dried using a hot air drier. As a result, the deposited polyphenylene ether was left as a porous film on the negative electrode active material layer. Thus, a negative electrode having a porous coating integrally was formed. The positive electrode and the negative electrode obtained above were overlapped so that a porous film was sandwiched between them, and a predetermined number of turns were formed to form an electrode wound body. The wound electrode body was inserted into a cylindrical bottomed battery case and assembled.

On the other hand, an electrolytic solution was prepared in the same manner as in Example 1. Next, the same vacuum dryer as the vacuum dryer used in Example 1 was prepared, and the battery case to which the electrode winding body was attached was placed in a vacuum chamber. After the inside of the vacuum chamber was evacuated to 1 Torr or less, the inside of the vacuum chamber was heated to 120 ° C., and the wound electrode body was dried together with the battery case for 8 hours.

Subsequently, dry air was introduced into the vacuum chamber to bring the inside of the vacuum chamber to normal pressure, and then the previously prepared electrolytic solution was injected into the battery case. A cover was attached to the battery case, and caulking was performed to seal the inside of the battery case. Thus, a wound lithium ion secondary battery in which a porous film was formed on the surface of the negative electrode was completed. [Evaluation of Battery] As described above, Examples 1 and 2
The internal resistance between the positive electrode and the negative electrode was measured for each of the lithium ion secondary batteries produced in Comparative Examples 1 and 2.

As a result, in each of the batteries of Example 1 and Example 2, the value of the internal resistance did not change, and the insulation was maintained. On the other hand, in the batteries of Comparative Example 1 and Comparative Example 2, the internal resistance was reduced and the batteries were short-circuited. When the battery of Comparative Example 1 was disassembled, it was found that the separator had shrunk. Therefore, it was found that the lithium ion secondary batteries manufactured in Comparative Examples 1 and 2 did not have excellent battery performance.

Next, each of the positive electrode active material layer, the negative electrode active material layer and a part of the separator was sampled from each of the lithium ion secondary batteries prepared in Example 1 and Comparative Example 2, and was subjected to Karl Fischer The amount of water contained in each sample was measured by the method. Based on the measurement result, the water content of one 18650 type battery was converted into a value.
The battery of Comparative Example 2 contained 8 mg of water,
It was found that a water content of 0.6 mg was contained.

From the above results, in the method of manufacturing the batteries of Examples 1 and 2, the insulative electrolyte permeable material did not shrink or melt, and the positive electrode, the negative electrode and the insulative electrolyte permeable material were sufficiently dried. You can see that it can be done. Therefore, the drying can be performed in an extremely short time as compared with the method of manufacturing the battery of the comparative example. Also, there is no increase in the number of steps.

Accordingly, it can be seen that the non-aqueous electrolyte batteries having the excellent battery performance can be manufactured with high productivity by the non-aqueous electrolyte battery manufacturing methods of Example 1 and Example 2.

[Brief description of the drawings]

FIG. 1 is a flowchart schematically showing a flow of a procedure of assembling a battery in a first embodiment.

FIG. 2 is a flowchart schematically showing a flow of a procedure of assembling a battery in Comparative Example 2.

Continuation of front page (72) Inventor Manabu Yamada 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 5H003 AA08 BA01 BA02 BB32 BC05 BD01 5H014 AA02 BB01 BB03 BB05 BB08 CC01 HH08 5H021 AA06 BB01 BB04 BB12 BB13 BB17 CC04 CC17 EE01 EE02 EE21 HH06 5H024 AA02 AA12 BB02 BB03 BB10 BB18 CC02 CC04 CC12 CC20 DD09 DD17 EE09 FF11 FF19 HH11 5H029 AJ14 AK03 AL06 AM01 AM02 AM06 AM07 BJ02 CJBJJ BJ02 C07 DJ08 DJ13 EJ01 EJ04 EJ05 EJ12 HJ14

Claims (3)

[Claims] 1. Production of a non-aqueous electrolyte battery provided with an electrode structure having a positive electrode, a negative electrode, and an insulating electrolyte permeant disposed between the positive electrode and the negative electrode and permeable to a non-aqueous electrolyte. The method of claim 1, wherein the insulating electrolyte permeable body is formed from at least one of a crystalline polymer having a melting point of at least 150 ° C. and an amorphous polymer having a glass transition temperature of at least 150 ° C. A method for producing a non-aqueous electrolyte battery, comprising: drying a porous electrolyte permeable body at a temperature of at least 80 ° C .; and immersing the electrode assembly having the dried insulating electrolyte permeable body in the non-aqueous electrolyte. . 2. The method according to claim 1, further comprising: exposing the electrode assembly in a state where the insulating electrolyte permeable body is disposed between the positive electrode and the negative electrode to an atmosphere of at least 80 ° C .; 2. The non-aqueous electrolyte battery according to claim 1, wherein the insulating electrolyte permeable body is dried at the same time. 3. The battery pack according to claim 2, further comprising a battery case accommodating the electrode assembly, wherein the electrode assembly is dried while the electrode assembly is accommodated in the battery case. Of manufacturing a non-aqueous electrolyte battery.