JP2003217669A - Method of manufacturing nonaqueous electrolyte battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a nonaqueous electrolyte bat tery with a simple system. <P>SOLUTION: The method of manufacturing a nonaqueous electrolyte battery comprises a process of forming an electrode body, a process of inserting the electrode body, a process of drying the electrode body, and a process of injecting nonaqueous electrolyte. In the method, the process of injecting the nonaqueous electrolyte is a process of injecting the nonaqueous electrolyte into a case in which the pressure reduced in the electrode body drying process is maintained. Accordingly, the nonaqueous electrolyte can be easily injected into the case by the method of manufacturing the nonaqueous electrolyte, and therefore, the nonaqueous electrolyte battery can be manufactured at low costs. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte as an electrolyte.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for a secondary battery which can be made lighter and smaller as a power source for driving a portable device. Among these secondary batteries, non-aqueous electrolyte secondary batteries, especially lithium secondary batteries, are highly expected as batteries having high voltage and high energy density.

In general, a lithium secondary battery has a laminated electrode body in which a strip-shaped positive electrode and a strip-shaped negative electrode are laminated by winding or the like via a separator made of a porous material, and an electrolyte is dissolved in an organic solvent. It is composed of an electrolytic solution and a case containing these.

In addition, in the conventional method for manufacturing a non-aqueous electrolyte secondary battery, high temperature is applied before and after processing the positive electrode and the negative electrode to have a predetermined thickness and width for the purpose of removing water or suppressing re-adsorption to the electrodes. Is being dried. After drying at high temperature, the electrodes are loaded into a dry room such as a dry room. In the loaded dry room, winding, storage in a case, injection of electrolyte solution, hermetic sealing of the case, etc. The main steps of are carried out.

The above-mentioned conventional manufacturing method has a problem that the facility cost of the drying chamber becomes high. That is, a large drying chamber is required in order to carry out the main steps such as winding the electrode, housing in the case, injecting the electrolytic solution, and hermetically sealing the case.

[0006] In order to reduce a large equipment cost due to such a large drying chamber, there is a manufacturing method in which the entire case is heated and dried while the positive electrode and the negative electrode are housed in the case. Furthermore, there is a manufacturing method in which drying is performed in a state where the pressure inside the case is reduced.

However, in the above-mentioned manufacturing method, the case is cooled after being dried, and then the case is evacuated again to inject the non-aqueous electrolyte.

This manufacturing method also has a problem that the manufacturing process is complicated because it is necessary to perform vacuuming after cooling.

[0009]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a simpler method for producing a non-aqueous electrolyte secondary battery.

[0010]

The inventors of the present invention have made the following inventions as a result of earnest research for the purpose of solving the above problems.

That is, the method for producing a non-aqueous electrolyte battery of the present invention comprises an electrode body forming step of forming an electrode body by superposing a positive electrode, a negative electrode, and a separator sandwiched between the positive electrode and the negative electrode, An electrode body inserting step of inserting the electrode body into the case; an electrode body drying step of reducing the pressure inside the case while the electrode body is inserted and drying the electrode body while the inside of the case is being reduced; A non-aqueous electrolyte solution injection step of injecting a non-aqueous electrolyte solution in, a non-aqueous electrolyte solution injection step, wherein the non-aqueous electrolyte solution injection step, the reduced pressure in the electrode body drying step It is characterized in that it is a step of injecting a non-aqueous electrolyte into the maintained case.

In the method of manufacturing the non-aqueous electrolyte battery of the present invention, the non-aqueous electrolyte solution is injected into the depressurized case. Specifically, since the pressure inside the case when injecting the electrolytic solution is kept lower than the atmospheric pressure, a force in the direction from the outside to the inside of the case acts on the non-aqueous electrolytic solution, and the non-aqueous electrolytic solution is injected. Be promoted. That is, in the method for producing a non-aqueous electrolytic solution of the present invention, the non-aqueous electrolytic solution can be injected into the case by the low pressure in the case, so that the non-aqueous electrolytic solution can be simply injected into the case. INDUSTRIAL APPLICABILITY The method for producing a non-aqueous electrolyte solution of the present invention has the advantage that a non-aqueous electrolyte battery can be produced at low cost because the non-aqueous electrolyte solution can be simply injected into the case.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A method for manufacturing a non-aqueous electrolyte battery according to the present invention comprises an electrode body forming step of forming an electrode body by stacking a positive electrode, a negative electrode, and a separator sandwiched between the positive electrode and the negative electrode. And an electrode body inserting step of inserting the electrode body into the case, and an electrode body drying step of reducing the pressure inside the case with the electrode body inserted and drying the electrode body under the reduced pressure inside the case. And a non-aqueous electrolyte injection step of injecting a non-aqueous electrolyte into the case.

In the method for producing a non-aqueous electrolyte battery of the present invention, the electrode body forming step produces an electrode body for the non-aqueous electrolyte battery. In the electrode body inserting step, the electrode body is housed in the case. In the electrode body drying step, the pressure inside the case is reduced, so that the water present in the case is removed. More specifically, the pressure inside the case is reduced, so that the boiling point in the case is lowered and water is evaporated even at a low temperature. In the non-aqueous electrolyte injection step, the non-aqueous electrolyte is injected into the case. By injecting the nonaqueous electrolytic solution into the case, an electrode reaction occurs in the electrode body.

In the method for manufacturing a non-aqueous electrolyte battery of the present invention, the non-aqueous electrolyte injection step injects the non-aqueous electrolyte solution into a case where the reduced pressure in the electrode body drying step is maintained. It is a process.

That is, in the method for manufacturing a non-aqueous electrolyte battery of the present invention, the pressure in the case is low before the non-aqueous electrolyte is injected. When the nonaqueous electrolytic solution is injected into the case, the low pressure causes the nonaqueous electrolytic solution to be sucked into the case. By this suction, the non-aqueous electrolyte is supplied into the case in a short time.

In the manufacturing method of the present invention, since the non-aqueous electrolyte is injected with the pressure inside the case kept low, the case is preferably airtight.

The case has a decompression tube having one end opened in the case and the other end connected to a decompression means for sucking gas inside the case, and a decompression pipe, one end opened in the case and the other end It is preferable to have a liquid injection pipe having a pipe line connected to an electrolytic solution injection means for injecting the non-aqueous electrolytic solution. That is, by providing a conduit in the case, it is possible to hermetically reduce the pressure in the case and inject the non-aqueous electrolyte solution.

It is preferable that the opening at one end of the pressure reducing pipe and the opening at one end of the liquid injection pipe are integrally formed. That is,
By integrally forming the openings at one end of the decompression pipe and the liquid injection pipe, it becomes easy to manage the entry and exit of the substance into and from the case.
Furthermore, the case can be sealed by sealing the integrally formed opening after injecting the non-aqueous electrolyte. This indicates a reduction in the number of work steps required for sealing. Furthermore, since the opening is integrally formed, the substance can enter and leave the case at one place, and the non-aqueous electrolyte injection hole used in the conventional non-aqueous electrolyte battery can be used. You will be able to. That is, no special case is required to carry out the manufacturing method of the present invention.

It is preferable that the non-aqueous electrolyte is injected into the case through the liquid injection pipe in a state where the pressure reducing pipe is sealed.
That is, by sealing the pressure reducing tube, the non-aqueous electrolyte injected into the case can be prevented from entering the inside of the pressure reducing tube, and the loss of the non-aqueous electrolyte can be suppressed.

The decompression pipe and / or the liquid injection pipe is not particularly limited as long as it can be hermetically sealed.
For example, a resin material and a metal material can be used.
It is more preferable that the resin material is inexpensive and has electrical insulation. The resin material of the decompression pipe and / or the liquid injection pipe is capable of compressing the pipe in the radial direction to change the cross-sectional shape of the pipe and fusing and sealing the inner peripheral surface of the compressed and abutting pipe. More preferably, it is made of a thermoplastic resin that can be used. At this time, at least the liquid injection pipe is preferably a resin that does not react with the electrolytic solution.

The larger the pressure difference between the inside and the outside of the case in the electrode body drying step, the better. That is, the greater the pressure difference, the greater the force that acts on the non-aqueous electrolyte during injection. As a result, the non-aqueous electrolyte solution is injected into the case in a short time in the non-aqueous electrolyte solution injection step. The inside of the case in the electrode body drying step is preferably vacuum. The pressure generally called vacuum is 133 Pa
A pressure of (1 torr) or less is shown. That is, it is preferable to reduce the pressure in the case to 133 Pa or less in the electrode body drying step.

In the electrode body drying step, it is preferable to heat the electrode body while the pressure inside the case is reduced. By heating the electrode body, removal of water from the electrode body is promoted. At this time, the heating temperature is preferably equal to or higher than the boiling point of water under reduced pressure. The method of heating the electrode body in the electrode body drying step is not particularly limited as long as it can heat at least the electrode body. For example, a heating method of heating only the electrode body or a heating method of heating the entire case can be used.

The heating temperature in the electrode body drying step is preferably below the temperature at which the electrode body is not destroyed. That is, in a normal non-aqueous electrolyte secondary battery, since the separator disposed between the positive electrode and the negative electrode is made of a microporous resin, if the heating temperature becomes too high, the separator will melt. . As a result, the characteristics of the manufactured non-aqueous electrolyte battery deteriorate.

The non-aqueous electrolyte battery produced by the production method of the present invention is not particularly limited. That is, the production method of the present invention can be applied to the production of a non-aqueous electrolyte secondary battery having a non-aqueous electrolyte that needs to avoid mixing of water.

The method for manufacturing the non-aqueous electrolyte battery of the present invention will be described based on the method for manufacturing a lithium ion secondary battery.

The lithium-ion secondary battery is a lithium-ion secondary battery capable of inserting and extracting lithium ions as a positive electrode active material.
A lithium ion secondary battery having a positive electrode having a metal composite oxide as a positive electrode active material layer and a negative electrode capable of absorbing and releasing lithium ions.

The lithium ion secondary battery of this embodiment is
The shape is not particularly limited, and it can be used as a battery of various shapes such as a coin shape, a cylinder shape, and a square shape. In the present embodiment, description will be made based on a cylindrical lithium ion secondary battery.

The cylindrical lithium ion secondary battery of the present embodiment is an electrolytic solution in which a positive electrode and a negative electrode are formed into a sheet shape, both are laminated via a separator, and a spirally wound electrode body is wound many times to fill a void. It is also stored in a predetermined case. The positive electrode and the positive electrode terminal portion are electrically connected to each other, and the negative electrode and the negative electrode terminal portion are electrically connected to each other.

The spirally wound electrode body comprises a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are formed into a sheet shape, and both are laminated via the separator, and spirally wound.

Here, the form of the electrode body of the non-aqueous electrolyte battery manufactured by using the manufacturing method of the present invention is not particularly limited, and in addition to the cylindrical winding type electrode body, the rectangular winding type. It may be a laminated electrode body in which a spiral electrode body or electrodes are not wound and a plurality of positive electrodes and negative electrodes are laminated with a separator interposed therebetween.

Specifically, the wound electrode body can be formed by attaching the ends of the positive electrode, the negative electrode and the separator to the winding core and winding the positive electrode and the like around the winding core.

Further, it is necessary to connect the positive electrode side and the negative electrode side of the formed electrode body to the positive electrode terminal portion and the negative electrode terminal portion, respectively, but the connection can be performed before or after the electrode body forming step. For example, leads for connecting to the terminal portion may be connected to the positive electrode and the negative electrode before forming the electrode body, or may be connected during or after forming the electrode body.

The positive electrode has, as a positive electrode active material, a lithium-metal composite oxide capable of releasing lithium ions during charging and occluding lithium ions during discharging. The lithium-metal composite oxide has excellent performance of the active material such as excellent diffusion performance of electrons and lithium ions. Therefore, when such a composite oxide of lithium and transition metal is used for the positive electrode active material, high charge / discharge efficiency and good cycle characteristics can be obtained. Further, as the positive electrode, it is preferable to use a positive electrode mixture material obtained by mixing a positive electrode active material, a conductive material, and a binder, which is applied to a current collector.

The positive electrode active material is a lithium-metal composite oxide.
The active material is not particularly limited as long as it is a known material
Can be used. For example, Li_(1-X)NiO₂,
Li _(1-X)MnO₂, Li_(1-X)Mn₂O_Four, Li_(1-X)Co
O₂Or transition metals such as Li, Al, and Cr
Examples thereof include added or replaced materials. The positive electrode activity
Only one substance can be used alone
However, a plurality of substances may be mixed and used. And
X in the illustration of the positive electrode active material represents a number of 0 to 1.

The negative electrode is not particularly limited in its material structure as long as it can absorb lithium ions during charging and release lithium ions during discharging, and known materials can be used. In particular, it is preferable to use a negative electrode mixture material obtained by mixing the negative electrode active material, the conductive material and the binder, which is applied to the current collector. The negative electrode active material is not particularly limited by the kind of the active material, and a known negative electrode active material can be used. Among them, carbon materials such as natural graphite and artificial graphite having high crystallinity are excellent in the performance of the active material, such as excellent storage performance and diffusion performance of lithium ions. Therefore, when such a carbon material is used for the negative electrode active material, high charge / discharge efficiency and good cycle characteristics can be obtained. Furthermore, it is more preferable to use metallic lithium or a lithium alloy as the negative electrode from the viewpoint of battery capacity.

The separator plays a role of electrically insulating the positive electrode and the negative electrode, holding the electrolytic solution, and ensuring the conduction between the positive electrode and the negative electrode, and the material forming the separator has a high insulating property. And preferably has intermolecular gaps or pores that do not hinder the permeation of ions. For example, a microporous film can be used as the separator.

The separator is prepared by dissolving a resin or the like forming the separator in a good solvent on a flat plate and immersing it in a poor solvent by a chemical method such as the above-mentioned resin melt-molded into a film. It can be manufactured by a physical method such as stretching.

It is preferable that the separator has a size larger than the sizes of the positive electrode and the negative electrode in order to ensure the insulation between the positive electrode and the negative electrode.

Subsequently, the wound electrode body is inserted into the case.

The shape and material of the case are not particularly limited in the manufacturing method of the present invention. Generally, a cylindrical shape or a rectangular shape is well known as the shape of the case. Further, the material needs to be a material that is electrochemically stable in relation to the non-aqueous electrolytic solution injected inside.

A gasket is sandwiched between the case and the lid and the positive and negative terminal portions in order to keep the case hermetically sealed and insulated. The gasket ensures electrical insulation between the case and the terminal portion and hermeticity in the case. The gasket can be made of, for example, a polymer such as polypropylene that is chemically and electrically stable with respect to the electrolytic solution.

Then, the pressure inside the case is reduced with the wound electrode body inserted to remove the water content inside the electrode body. At this time, moisture is removed by heating at least the electrode body. By drying the electrode body in the electrode body drying step, a dry case and an electrode body held in the dry case can be obtained.

Subsequently, the non-aqueous electrolyte is injected into the case while the reduced pressure inside the case is maintained.

The non-aqueous electrolytic solution is a solution in which a supporting salt of an electrolyte is dissolved in an organic solvent.

The organic solvent is not particularly limited as long as it is an organic solvent usually used in an electrolytic solution of a lithium ion secondary battery, and examples thereof include carbonate compounds, lactone compounds, ether compounds, sulfolane compounds, dioxolane compounds and ketones. Examples thereof include compounds, nitrile compounds and halogenated hydrocarbon compounds.

Specifically, carbonates such as dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate, ethylene glycol dimethyl carbonate, propylene glycol dimethyl carbonate, ethylene glycol diethyl carbonate, vinylene carbonate, and γ-butyl lactone. Such as lactones, dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, ether such as 1,4-dioxane, sulfolane, sulfolane such as 3-methylsulfolane, dioxolane such as 1.3-dioxolane, 4 -Ketones such as methyl-2-pentanone, nitriles such as acetonitrile, pyropionitrile, pareronitrile and benzonitrile Halogenated hydrocarbons such as 1,2-dichloroethane, other methyl formate,
Examples thereof include dimethylformamide, dimethylformamide, and dimethylsulfoxide. These may be used alone or as a mixture of a plurality of organic solvents selected from them.

Among these organic solvents listed as examples, particularly by using one or more non-aqueous solvent selected from the group consisting of carbonates and ethers, excellent solubility, dielectric constant and viscosity of the electrolyte can be obtained. Also, the charge and discharge efficiency of the battery is high, which is preferable. In addition, those having a high flash point are preferable from the viewpoint of easiness in injecting the electrolytic solution described later. In particular, it is preferable to use an electrolytic solution having a flash point of 70 ° C. or higher. A method of improving the flash point can be achieved by, for example, mixing a phosphoric acid ester.

The type of the supporting salt is not particularly limited, but an inorganic salt selected from LiPF ₆ , LiBF ₄ , LiClO ₄ and LiAsF ₆ , a derivative of the inorganic salt,
LiSO ₃ CF ₃ , LiC (SO ₃ CF ₃ ) ₂ and LiN
It is preferably at least one kind of an organic salt selected from (SO ₃ CF ₃ ) ₃ and a derivative of the organic salt.

By using this supporting salt, the battery performance can be further improved, and the battery performance can be maintained even higher in a temperature range other than room temperature.

The concentration of the supporting salt in the non-aqueous electrolyte is not particularly limited, and it is preferable to appropriately select it in consideration of the types of the supporting salt and the organic solvent according to the use.

Further, in the manufacturing method of the present invention, it is preferable that the step of injecting the non-aqueous electrolyte is performed after the temperature of the electrode body is cooled to a predetermined temperature. Since the viscosity of the electrolytic solution decreases as the temperature increases, the electrolytic solution permeates into the case and the electrode body more quickly when injected at a high temperature. here,
The predetermined temperature is not particularly limited, but is preferably as high as possible from the viewpoint of decreasing the viscosity of the electrolytic solution. However, if the temperature is set too high and is higher than the flash point of the organic solvent used for the electrolytic solution, capital investment for ignition prevention is required. Therefore, the temperature is preferably set lower than the flash point of the organic solvent used. For example, when ethylene carbonate or diethylene carbonate is used as the organic solvent, the temperature is preferably 70 ° C. or lower.

[0053]

EXAMPLES The present invention will be described below with reference to examples.

(Example) As an example of the present invention, a lithium secondary battery was produced. The state of the lithium secondary battery of this example during manufacturing is shown in FIGS. The manufactured lithium secondary battery of the example is shown in FIG.

First, the flat wound electrode body 4 was produced.
The flat wound electrode body 4 is an electrode body formed by winding the sheet-shaped positive electrode 1 and the sheet-shaped negative electrode 2 in a flat shape in a state of being laminated with the separator 3 interposed therebetween.

The positive electrode plate 1 contains 85 parts by weight of lithium manganate as an active material, 10 parts by weight of acetylene black as a conductive material, and 5 parts of polyvinylidene fluoride as a binder.
The mixture 112, which is kneaded with the parts by weight and made into a paste, is applied and pressure-bonded to both surfaces of the current collector 11 of aluminum foil having a thickness of 15 μm. Further, at this time, the positive electrode plate 1 has an uncoated portion 111 on which the mixture 112 is not coated.

Further, the negative electrode plate 2 was prepared by kneading 92.5 parts by weight of carbon as an active material and 7.5 parts by weight of polyvinylidene fluoride as a binder into a paste material.
A current collector 21 of a copper foil having a thickness of 10 μm is applied and pressure-bonded on both sides. Further, at this time, the negative electrode plate 2 has a mixture 21
There is an uncoated portion 211 where 2 is not coated.

Next, the separator 3 which is cut wide so that the mixture 112 of the positive electrode plate 1 and the mixture 212 of the negative electrode plate 2 do not come into direct contact is laminated between the positive electrode plate 1 and the negative electrode plate 2. did. At this time, the uncoated portion 111 of the positive electrode plate 1 and the uncoated portion 211 of the negative electrode plate 2 protrude from the separator 3 in directions opposite to each other. Subsequently, this laminated body was wound into a flat shape to produce a flat wound electrode body 4. As the separator 3, a film obtained by subjecting polyphenylene ether to a porous treatment was used.

The flat wound electrode body 4 has a flat shape in which the outer peripheral shape is wide in the width direction. Further, the flat wound electrode body 4 has a flat hollow portion defined on the innermost peripheral surface of the electrode plate.

Positive electrode 1 and negative electrode 2 of flat wound electrode body 4
The positive electrode terminal 15 and the negative electrode terminal 25 were joined to the uncoated portions 111 and 211, respectively. The positive electrode terminal 15 and the negative electrode terminal 25 have a shaft portion joined to the uncoated portions 111 and 211, and a terminal portion that projects from the battery case 7 and serves as an electrode of a manufactured lithium secondary battery. is doing. The positive electrode terminal 15 is made of aluminum, and the negative electrode terminal 2 is
5 is formed of a copper alloy.

The shaft terminals of the positive electrode terminal 15 and the negative electrode terminal 25 are joined in a state of extending in a direction orthogonal to the protruding direction of the uncoated portions 111 and 211 of the flat wound electrode body 4. Further, the extending directions of the positive electrode terminal 15 and the negative electrode terminal 25 were parallel to the expanding direction of the flat shape of the flat wound electrode body 4.

The flat wound electrode body 4 to which the positive electrode terminal 15 and the negative electrode terminal 25 are joined is housed inside the case 7 with the terminal portions of the positive electrode terminal 15 and the negative electrode terminal 25 exposed to the outside, and is hermetically sealed. Sealed. The case 7 is sealed via a gasket in order to ensure airtightness.

Here, the case 7 includes a battery case 71 and a lid 72.
It consists of and. The lid 72 has a pipe 75 communicating with the inside of the case 7. The pipe 75 has a T shape, one end of which is integrally formed with the lid 72, and the other two ends are connected to external devices. One of the other two ends of the pipe 75 was connected to an electrolyte injection device (not shown) for injecting a non-aqueous electrolyte, and the other was connected to a vacuum pump (not shown).

The case 7 was placed in a heating device (not shown) with the pipe 75 connected to the electrolytic solution injecting device and the vacuum pump. This heating device can heat the flat wound electrode body 4 via the case 7. As the heating device, a device including a heater arranged in a state of being substantially in contact with the outer periphery of the battery case 71 of the case 7 and a control unit for controlling the heater was used.

With the case 7 arranged in the heating device, the operation of the electrolytic solution injecting device is stopped so that the nonaqueous electrolytic solution is not supplied from the electrolytic solution injecting device to the pipe 75. When the operation of the electrolyte injection device is stopped, the pipe 7
Inflow of gas and liquid from the connected end side of the electrolyte injection device of No. 5 was blocked. The inside of the case 7 can be depressurized by operating the vacuum pump with the electrolyte injection device stopped. The pressure reduction in the case 7 by the vacuum pump was performed until the pressure in the case 7 became a vacuum of 133 Pa or less. Further, while the vacuum pump was operating, the heating device was operated to heat the flat wound electrode body 4 together with the case 7. The heating temperature at this time is
It was set to 60 ° C. The inside of the case 7 is evacuated and 6
It was held for 1440 minutes while being heated to 0 ° C. By this holding, the water inside the case 7 could be removed.

After drying the inside of the case 7, the end of the pipe 75 connected to the vacuum pump was compressed while being heated radially inward. Due to this compression, the inner peripheral surface of the pipe 75 was airtightly fused and the pipe 75 was sealed. Due to this sealing, the communication between the case 7 and the vacuum pump was interrupted while the vacuum inside the case 7 was maintained. The pipe 75 whose communication was cut off was cut at the vacuum pump side of the sealed portion.

Subsequently, the electrolyte injection device was operated with one end of the pipe 75 being sealed, and the non-aqueous electrolyte was injected into the pipe 75. Pipe 7 with electrolyte injection device
The nonaqueous electrolytic solution supplied into the case 5 was sucked into the case 7 due to the low pressure (vacuum) in the case 7. By this suction,
The nonaqueous electrolytic solution was injected into the case 7. After the injection of the non-aqueous electrolyte solution was completed, the pipe 75 was heated and pressed inward in the radial direction to be fused. Then, the pipe 75 was cut and sealed.

By the above means, the lithium secondary battery of the example was manufactured.

In the lithium secondary battery manufactured in this example, the non-aqueous electrolytic solution is injected into the decompressed case 7. That is, by maintaining the vacuum state in the case 7 when the flat wound electrode body 4 is dried, a force (negative pressure) in the direction from the outside to the inside of the case 7 works. In this embodiment, since the non-aqueous electrolytic solution is injected into the case 7 by this negative pressure, the non-aqueous electrolytic solution can be injected easily and the lithium secondary battery can be easily manufactured. You can

[0070]

The method for producing a non-aqueous electrolyte battery of the present invention comprises:
The non-aqueous electrolyte is injected into the depressurized case. Specifically, since the pressure inside the case when injecting the electrolytic solution is kept lower than the atmospheric pressure, a force in the direction from the outside to the inside of the case acts on the non-aqueous electrolytic solution, and the non-aqueous electrolytic solution is injected. Be promoted. That is, in the method for producing a non-aqueous electrolytic solution of the present invention, the non-aqueous electrolytic solution can be injected into the case by the low pressure in the case, so that the non-aqueous electrolytic solution can be simply injected into the case. INDUSTRIAL APPLICABILITY The method for producing a non-aqueous electrolyte solution of the present invention has an effect that a non-aqueous electrolyte battery can be produced at low cost because the non-aqueous electrolyte solution can be simply injected into the case.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a flat wound electrode body.

FIG. 2 is a view showing a flat wound electrode body to which electrode terminals are joined.

FIG. 3 is a diagram showing a case in which a flat wound electrode body is enclosed.

FIG. 4 is a view showing a case in which one end of a pipe is sealed.

FIG. 5 is a diagram showing a lithium secondary battery of an example.

[Explanation of symbols]

1 ... Positive electrode plate 11 ... Current collector 111 ...
Uncoated portion 112 ... Mixture 15 ... Positive electrode terminal 2 ... Negative electrode plate 21 ... Current collector 211 ...
Uncoated portion 212 ... Mixture 25 ... Negative electrode terminal 3 ... Separator 4 ... Flat wound electrode body 7 ... Case 71 ... Battery case 72 ...
Lid 75 ... pipe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiichi Habuka             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Hiroshi Ueshima             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 5H029 AJ14 AK03 AL06 AM03 AM05                       AM07 BJ02 CJ02 CJ13 CJ30                       DJ02 HJ15

Claims (5)

[Claims] 1. An electrode body forming step of forming an electrode body by stacking a positive electrode, a negative electrode, and a separator sandwiched between the positive electrode and the negative electrode, and an electrode body for inserting the electrode body into a case. An inserting step, an electrode body drying step of reducing the pressure inside the case with the electrode body inserted, and a step of drying the electrode body with the inside pressure of the case reduced; and a non-aqueous electrolysis inside the case. A non-aqueous electrolyte solution injecting step of injecting a liquid, the non-aqueous electrolyte solution injecting step, wherein the reduced pressure in the electrode body drying step is maintained. A method for manufacturing a non-aqueous electrolyte battery, comprising a step of injecting the non-aqueous electrolyte into the case. 2. The case comprises a decompression pipe having a pipe through which gas discharged from the case passes, and a pipe having the non-aqueous electrolyte injected into the case through the pipe. The method for producing a non-aqueous electrolyte battery according to claim 1, further comprising: 3. The method for manufacturing a non-aqueous electrolyte battery according to claim 2, wherein an opening at one end of the pressure reducing tube and an opening at one end of the liquid injection tube are integrally formed. 4. The production of a non-aqueous electrolyte battery according to claim 2, wherein the non-aqueous electrolyte is injected into the case through the liquid injection pipe in a state where the decompression pipe is sealed. Method. 5. The inside of the case is 1 in the electrode body drying step.
The method for producing a non-aqueous electrolyte battery according to claim 1, wherein the pressure is reduced to 33 Pa or less.