JP2001052748A - Non-aqueous electrolyte secondary battery and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide an inexpensive non-aqueous electrolyte secondary battery having high productivity by improving the yield of products, improving hermeticity, and simplifying the number of steps. It is an object of the present invention to provide a manufacturing method thereof. SOLUTION: A power generating element having a gel electrolyte having a high electrolyte retention property is mounted on a predetermined position of one of the laminated films, and the other laminated film is laminated on the laminated film on which the power generating element is mounted, and the laminated film is superimposed. Are sealed almost simultaneously at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat and sealed non-aqueous electrolyte secondary battery, and more particularly to a non-aqueous electrolyte secondary battery in which a power generation element is sealed in a film-like package by fusion of a resin at a peripheral portion. The present invention relates to a battery and a method for manufacturing the battery.

[0002]

2. Description of the Related Art In recent years, with the great progress in electronic technology, portable devices for general users have been reduced in size and weight.
Regarding advances in miniaturization and lightening in terms of battery packaging,
In particular, the materials used for non-aqueous electrolyte sealed batteries are
The transition is from heavy materials such as iron or stainless steel to light materials such as aluminum. For example, as for a laminated film, a film in which an aluminum foil is used as a core material and a synthetic resin layer is arranged on both surfaces thereof is mainly used.

A method for manufacturing a conventional non-aqueous electrolyte secondary battery using such a laminated film will be described. In the conventional manufacturing method, first, the laminated film except for a part of the laminated film peripheral portion is fused and sealed for each battery to make the laminated film into a bag shape. Next, the peripheral edge of the laminated film that is not sealed is an opening, and a positive electrode plate as a power generating element, a negative electrode plate, and a non-aqueous electrolytic solution are inserted into the bag from the opening with the non-aqueous electrolyte. inject. Finally, the opening is sealed with the tip of the electrode terminal protruding from the opening. Through the above steps, a non-aqueous electrolyte secondary battery was manufactured.

[Problems to be solved by the invention]

However, in the conventional method of manufacturing a non-aqueous electrolyte secondary battery described above, the peripheral portion of the laminate film other than the opening is sealed by fusing, the pressure is reduced and liquid injection is performed, and then the opening is fused. In order to perform sealing, it was necessary to perform fusion sealing at the periphery of the laminated film twice or more. By performing the fusion sealing twice or more in this manner, unevenness such as wrinkles is generated on the periphery of the laminate film, particularly on the periphery of the laminate film where the lead end protrudes, and the hermeticity of the nonaqueous electrolyte secondary battery is reduced. There are problems such as a decrease in yield and a remarkable decrease in yield.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and it is an inexpensive non-aqueous electrolyte having high productivity by improving the yield, improving the sealing performance, and reducing the number of steps. An object of the present invention is to provide a secondary battery and a method for manufacturing the secondary battery.

[0006]

Means for Solving the Problems The first invention of the present application for solving the above-mentioned problems comprises a positive electrode, a negative electrode and a separator in a laminate film package in which a fusible resin film is disposed on the inner surface of a metal foil. A non-aqueous electrolyte having a power generating element consisting of a pole group, wherein the peripheral portion of the package is sealed and sealed, and electrode terminals connected to the positive electrode and the negative electrode respectively penetrate from the power generating element to the outside of the peripheral portion. A non-aqueous electrolyte, wherein a part of the power generation element is made of a gel electrolyte having a high electrolyte retention property, and the entire periphery of the package is sealed at substantially the same time. It is a secondary battery.

Therefore, according to the non-aqueous electrolyte secondary battery of the first invention of the present application, since the entire periphery of the package is fused and sealed almost simultaneously, the hermeticity is improved,
There is an advantage that the yield is improved.

Further, the second invention of the present application comprises a non-aqueous electrolyte and an electrode group comprising a positive electrode, a negative electrode and a separator in a laminate film package in which a fusible resin film is disposed on the inner surface of a metal foil. A non-aqueous electrolyte secondary battery having a power generating element, wherein a peripheral portion of the package is fusion-sealed, and an electrode terminal connected to each of a positive electrode and a negative electrode penetrates from the power generating element to the outside of the peripheral portion. A non-aqueous electrolyte secondary, wherein a part of the power generating element is made of a gel electrolyte having a high electrolyte retention property, and an indentation pattern is substantially uniformly dispersed over the entire periphery of the package. Battery.

Therefore, according to the non-aqueous electrolyte secondary battery of the second invention of the present application, since the indentation pattern is substantially uniformly dispersed on the entire periphery of the package, the strength of the entire package is improved, Hermeticity can be improved. Further, a defective product can be reliably found by using a pattern related to a product inspection as an inspection index.
In addition, it is possible to prevent the resin from flowing out during fusion sealing. Further, stress such as thermal expansion of the laminated film can be dispersed, and the sealing performance can be improved.

The third invention of the present application is characterized in that a part of the fusible resin film protrudes from the peripheral portion where the electrode terminal is located.

Therefore, according to the non-aqueous electrolyte secondary battery of the third invention of the present application, since a part of the fusible resin film protrudes from the peripheral portion where the electrode terminal is located, A portion located on the peripheral edge side of the electrode terminal is covered with the fusible resin film, so that the electrode terminal touches the package due to bending or the like, and leakage of current can be prevented. Further, stress concentration at the entire peripheral edge of the package is avoided, and the strength of the entire package is improved. Further, there is an advantage that stress concentration at the peripheral portion of the package where the electrode terminals are located is avoided, sealing performance is improved, and strength is improved. In addition, since the peripheral edge of the package where the electrode terminals are located has a uniform pressure-bonded surface due to the fusible resin film, the hermeticity is improved.

Further, the fourth invention of the present application is directed to a drawing step of drawing a laminated film;
Laminating or winding the positive electrode plate and the negative electrode plate via a highly liquid-retaining gel electrolyte to form a pole group that is a power generation element, and connecting the positive electrode terminal and the negative electrode terminal to the pole group,
In a mode in which the power generating element is included and the electrode terminals are exposed to the outside of the laminate film peripheral portion, a laminating step of laminating the laminated film and the laminate film subjected to the drawing process, and the entire peripheral portion of the laminated laminate film At the same time, and a sealing step of fusing and sealing the non-aqueous electrolyte secondary battery.

Therefore, according to the method for manufacturing a nonaqueous electrolyte secondary battery of the fourth invention of the present application, a drawing step of drawing a laminated film, and a method of holding a separator, a positive electrode plate and a negative electrode plate in an electrolyte retaining property. Laminating or winding through a high gel electrolyte to form a pole group as a power generation element, a connection step of connecting a positive electrode terminal and a negative electrode terminal to the pole group, and including the power generation element, an electrode terminal laminate film A laminating step of laminating the drawn laminated film and the laminated film in such a manner as to be exposed to the outside of the peripheral part, and a sealing step of simultaneously pressing the entire peripheral part of the laminated laminated film and fusing and sealing. Therefore, there is an advantage that a complicated process is not required and productivity and workability are improved. In addition, since a gel electrolyte having a high liquid retention property is employed, the laminated film can be safely sealed and sealed without liquid leakage. In addition, in the sealing step, since the entire peripheral edge portions of the laminated laminate films are simultaneously sealed by fusion, defects at the time of fusion sealing can be prevented, and the yield can be improved.

The fifth invention of the present application is characterized in that the sealing step is performed after reducing the atmosphere to a predetermined pressure.

Therefore, according to the method for manufacturing a non-aqueous electrolyte secondary battery of the sixth invention of the present application, the sealing step is performed after reducing the atmosphere to a predetermined pressure, so that the adhesion between the electrode groups is reduced. And, as a result, battery characteristics are improved.

Further, the sixth invention of the present application is characterized in that the predetermined pressure is set to 0.5 atm or less.

[0017] Battery characteristics improve with reduced pressure. From such a viewpoint, it is preferable that the degree of pressure reduction be higher. However, increasing the degree of decompression requires a great deal of time and large-scale equipment. Therefore, by reducing the predetermined pressure to about 0.5 atm or less, large-scale equipment required for decompression is not required, and the time required for decompression can be shortened, and the cycle time of the production line is shortened. it can. That is, workability and productivity can be improved, and costs can be further reduced to facilitate industrial application.

[0018] In a seventh aspect of the present invention, the sealing step is a step of performing a pressing with a sheet member interposed in a region where the electrode terminal and the entire peripheral portion of the laminated film overlapped with the electrode terminal overlap. Features.

Therefore, according to the method for manufacturing a non-aqueous electrolyte secondary battery of the seventh invention of the present application, the sealing step is performed in a region where the electrode terminals and the entire periphery of the laminated film overlapped are overlapped. Since the pressing step is performed with a sheet member interposed therebetween, there is an advantage that the sealing can be performed safely and securely without applying heat or a mechanical load to the electrode terminals.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-aqueous electrolyte secondary battery according to an embodiment of the present invention and a method for manufacturing the same will be described below with reference to the drawings.

Embodiment FIG. 1 is a cross-sectional view of a laminate film according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention as viewed from below, and FIG. FIG. 2 is a cross-sectional view taken along line AA ′ of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention. First, the configuration of a laminate film of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention will be described with reference to FIG. The laminated film 1 has a triple structure, in which a resin film 2 such as polyethylene terephthalate or nylon having a high strength is disposed on an outer surface as a protective layer, and a fusible resin film 3 such as modified polypropylene is disposed on an inner surface. And a metal foil 4 such as an aluminum foil. Further, the fusible resin film 3 is made of an acid-modified polyolefin, ionomer, ethylene-vinyl acetate copolymer, ethylene-acryl, which has good adhesion to the base material of the laminated film 1, that is, aluminum or aluminum alloy as a core material. It is preferable to use a metal adhesive resin such as an acid copolymer and an ethylene-methacrylic acid copolymer. However, if a metal adhesive layer is provided at a connection portion with a terminal, polypropylene or polyethylene can be used.

Next, the configuration of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 2 and 3, the configuration of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention is such that a positive electrode plate 6, a negative electrode plate 7, a separator 8, It has a power generating element 10 composed of a pole group 9 composed of a gel electrolyte (not shown) having a high liquid retention property. The power generating element 10 is configured by stacking two pole groups 9 inside the package 5. Further, the power generation element 1
0 negative electrode plate 7 is connected to negative electrode terminal 11 and positive electrode plate 6
Is connected to the positive electrode terminal 12. The power generating element 10
Has a gel electrolyte having a high electrolyte retention property, and has an effect of preventing liquid leakage. Further, the gel electrolyte is impregnated in the porous base material of the separator 8, but is not limited to this, since it may be applied or impregnated to at least one of the power generation elements 10. Furthermore, the gel electrolyte used in the nonaqueous electrolyte secondary battery of the present embodiment has, for example, an alkyl skeleton containing fluorine, and is formed by polymerizing from a monomer having a polymerizable functional group as a functional group in a molecular structure. It is assumed that the union is formed in a solid state as a gel skeleton matrix. Further, the polymerizable functional group is a vinyl ketone type or a vinyl type, for example, an acryloyl group, a methacryloyl group, or an allyl group. Since a polymerization product obtained by polymerizing a monomer containing fluorine has an alkane containing fluorine in a skeleton, interaction with a solvent molecule or a solute molecule is small. In addition, it is chemically and electrochemically stable. Further, although an acid ester structure remains in the main skeleton, it is preferable to employ the above-mentioned gel electrolyte because the presence of an appropriate polar group can prevent solvent syneresis. Further, when the gel electrolyte described above is described in more detail, polyethylene oxide, a copolymer of polyethylene oxide, polyacrylonitrile, polyvinylidene fluoride, a copolymer of polyvinylidene fluoride, a copolymer of propylene hexafluoride, polymethyl methacrylate, polyacrylamide, It is preferable to use polycarbonates or cross-linked products having a straight chain or an iso-hetero atom in the polymer molecule having an iso-hetero atom in the polymer molecule.

In addition, a substantially uniform indentation pattern 14 is provided on the peripheral portion 13 of the package 5 in order to improve hermeticity.
Is arranged. The indentation pattern 14 is formed on the peripheral portion 13.
The package is formed on the peripheral portion 13 at the time of sealing the package by a tool end face (not shown) for pressing and sealing the package. That is,
The indentation pattern 14 is formed by transferring a pattern (not shown) applied to the tool end face. The phrase that the impression pattern 14 is substantially uniform means that the same impression pattern 14 as the pattern existing on the tool end face is formed on the peripheral portion 13 by a single sealing process. Therefore, when a composite pattern is formed by pressing the tool a plurality of times, the impression pattern 14 is not substantially uniform. On the other hand, when the intervals (for example, the intervals between dots) between the patterns formed on the tool end surface in advance are non-uniform, the pattern itself on the tool end surface is non-uniform and discontinuous. Perimeter 13
The upper impression pattern 14 may be non-uniform or discontinuous. In this case, as long as only the same indentation pattern 14 as the pattern on the tool end surface exists in the peripheral portion 13, this corresponds to the case where the indentation pattern 14 according to the present invention is substantially uniform. As described above, since the peripheral portion 13 of the package 5 has all the peripheral portions 13 melted and sealed almost at the same time, generation of wrinkles and the like is not recognized, the hermeticity and airtightness are improved, and the yield is improved. It has the effect of being improved.

Next, a method for manufacturing a non-aqueous electrolyte secondary battery according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4. FIG. 4 is a manufacturing process diagram of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention. As shown in FIG. 4, in the method for manufacturing a nonaqueous electrolyte secondary battery according to the embodiment of the present invention, first, in a cutting step 15, the laminate film 1 is cut into a predetermined size, for example, a shape close to a final product. Next, in a drawing step 16, drawing is performed on the laminated film (not shown) cut to a predetermined size.

In the connecting step 17, a gel electrolyte (not shown) having a high electrolyte retention property is applied or impregnated on one surface of the separator 8 contacting the positive electrode plate 6 and one surface of the separator 8 contacting the negative electrode plate 11. After that, the separator 8 and the positive electrode plate 6
After the negative electrode plate 7 is laminated or wound to form the electrode group 9 as the power generation element 10, the electrode group 9 is connected to the positive electrode terminal 12 and the negative electrode terminal 11 (electrode terminal). In this embodiment, the separator 8 is coated or impregnated with the gel electrolyte. However, all or one or more of the separator 8, the positive electrode plate 12, and the negative electrode plate 11 may be coated or impregnated.

Next, in an overlapping step 18, a drawing step 1
The drawn laminated film (not shown) that has passed through 6 is turned downward, and the power generating element 10 is mounted at a predetermined position.
At this time, the positive electrode terminal 12 and the negative electrode terminal 11 connected to the power generating element 10 are
The power generation element 10 is mounted so as to protrude from a part of the power generation element. Thereafter, a non-drawing laminated film cut to a predetermined size without drawing is superposed from above.

Next, in a sealing step 19, the atmosphere of the laminated laminate film (not shown) is reduced in pressure.
At this time, the higher the degree of pressure reduction, the better the battery characteristics. Battery characteristics improve with reduced pressure. From such a viewpoint, it is preferable that the degree of pressure reduction be higher. But,
Increasing the degree of decompression requires a great deal of time and large-scale equipment. Therefore, by reducing the predetermined pressure to 0.5 atm or less, large-scale equipment required for decompression is not required,
There is an advantage that the time required for decompression can be reduced, and the cycle time of the production line can be reduced. That is, workability and productivity can be improved,
Further, the cost can be reduced and industrial application can be facilitated. After the pressure reduction, all the peripheral portions 13 of the laminated laminated films are sealed and sealed almost simultaneously to form a package. Here, "substantially at the same time" means that substantially all the peripheral portions 13 of the laminated films superposed in one step are fused and sealed. The peripheral portion 13 of the laminated laminate film and the peripheral portion 1 of the package
3 indicates the same position.

As described above, in the sealing step 19, all the peripheral portions 13 are fused and sealed substantially simultaneously. By adopting such a process, it is possible to prevent the occurrence of unevenness such as wrinkles, etc., which has occurred when the conventional partial pressure bonding is performed, and to improve the airtightness of the battery. Here, a method of performing the fusion sealing will be described. As a method for performing the fusion sealing, a high frequency method or a heat block method is used. The high frequency method is a method in which high frequency is applied to a metal to generate heat from the metal body itself. In the heat block method, heat is generated from a tool end face (not shown) which presses the peripheral edge 13 of the package peripheral edge 13 to press the tool end face, thereby heating the fusible resin film 3 of the laminated film which is superimposed when the tool end face is pressed. This is a method of melting and sealing. In the present embodiment, since the laminate film 1 has a triple structure and has the above-described structure, it is desirable to adopt a high-frequency method from the viewpoint of not deteriorating the resin film 2 on the upper surface of the laminate film 1. Also,
By providing a pattern (not shown) on the end face of the tool which is pressed against the peripheral portion 13 of the package 5 at the time of the fusion sealing, the impression pattern 14 can be formed on the peripheral portion 13 of the package 5. By forming the indentation pattern 14 on the peripheral edge 13 of the package 5, the hermeticity and airtightness of the package 5 can be further improved. In this case, if the pattern provided on the end face of the tool penetrates the positive electrode terminal 12 or the negative electrode terminal 11 when the indentation pattern 14 is formed, a short circuit occurs in the peripheral portion 13 where the positive electrode terminal 12 and the negative electrode terminal 11 are located. However, a film (not shown) made of a material such as plastic or resin is mounted on the peripheral portion 13 where the positive electrode terminal 12 and the negative electrode terminal 11 where the patterns provided on the tool end face are pressed against each other are applied, and the voltage is applied from the tool end surface. Such problems can be solved by controlling the pressure. Further, the indentation pattern 14 formed by the method for manufacturing a nonaqueous electrolyte secondary battery of the present embodiment is not formed by a film, but is formed by transferring a pattern of a tool end face. Indentation pattern 14 referred to in FIG. The amount of heat (temperature) generated from the metal by the high frequency method is determined by the distance between the high frequency generator and the target metal body, the type of the target metal body, and the strength of the high frequency. When the intensity of the high frequency is constant and the type of the target metal body is the same, the calorific value is inversely proportional to the distance. Therefore, by mounting the film on the peripheral portion 13 where the positive electrode terminal 12 and the negative electrode terminal 11 are located, the peripheral portion 13 on which the film is mounted is different from the other peripheral portions 13.
The distance from the tool end face becomes large as compared with, the temperature is controlled, and the temperature becomes low as compared with other peripheral portions 13. As a result, the melting rate of the fusion resin film 3 is controlled, the load applied to the positive electrode terminal 12 and the negative electrode terminal 11 is reduced, and the fusion sealing can be performed safely and reliably. When the heat block method is adopted, it is preferable that the film has low thermal conductivity in the sense that the laminated film 1, the positive electrode terminal 12, and the negative electrode terminal 11 are not deteriorated. When the film is used to cover two or more electrode terminals (not shown), it is preferable to use an insulating film in order to prevent a short circuit due to current conduction between the two electrodes, particularly the positive electrode and the negative electrode.

Next, the pressure is released in the cutting step 20, and the periphery of the package is cut at a predetermined position. Further, by cutting other than the peripheral portion where the positive electrode terminal 12 and the negative electrode terminal 11 are located, the fusible resin film 3 protruding to the outside of the peripheral portion 13 by crimping is used.
To cover the root of the As a result, the positive terminal 1
This avoids stress concentration at the peripheral edge 13 located at the root of the negative electrode terminal 2 and the negative electrode terminal 11, and improves the strength of the package 5. Further, the non-aqueous electrolyte secondary battery according to the present embodiment has a cutting step 2
It is charged after going through 0.

In the non-aqueous electrolyte secondary battery and the method of manufacturing the same according to the embodiment of the present invention, the laminated film that has been subjected to the drawing process and the laminated film that has not been subjected to the drawing process are superimposed on each other, and the process is sequentially advanced. However, the method for manufacturing a non-aqueous electrolyte secondary battery of the present invention can be performed even when the drawn laminate films are overlapped with each other. Further, a cutting step 15 for cutting the laminate film into a predetermined dimension and a drawing step 16 for the laminate film
May be reversed, the laminated film before cutting may be subjected to a drawing process, and then the laminated film may be cut into a predetermined size and the process may be sequentially performed. Further, after the drawing process is performed on one of the long laminated films, the power generation element 10 obtained in the connecting step 17 is mounted on a predetermined position of the one of the laminated films, and the other long laminated film (the drawn film) is formed. (With or without drawing). Thereafter, the packaged laminated film can be cut into a predetermined size through a sealing step 19.

In addition, the non-aqueous electrolyte of the above-described embodiment of the present invention
Another configuration example of the power generation element that is one component of the degraded secondary battery
Will be described with reference to FIG. FIG. 5 is shown in FIG. 1 described above.
A-A ′ cut of the non-aqueous electrolyte secondary battery according to the embodiment of the present invention
FIG. Power generating element 10 consisting of pole group 9
The positive electrode plate 6 includes a positive electrode current collector 21 such as aluminum and a positive electrode active material.
22, and the negative electrode plate 7 is made of a negative electrode current collector 23 such as copper.
And the negative electrode active material 24. In addition, the positive electrode active material
Examples of 22 include the following battery electrode materials. Immediately
, CuO, Cu₂O, Ag₂O, CuS, CuSO₄
Group I metal compounds such as TiS₂, SiO₂, SnO
Which group IV metal compound, V₂O₅, V₆O_{1 2}, V
O_x, Nb₂O₅, Bi₂O₃, Sb₂O₃V group such as
Metal compound, CrO₃, Cr₂O₃, MoO₃, MoS
₂, WO₃, SeO₂Group VI metal compounds such as MnO
₂, Mn₂O₃Group VII metal compounds such as Fe
₂O₃, FeO, Fe₃O₄, Ni₂O₃, NiO, C
oO₃VIII group metal compound such as CoO,
General formula LixMX₂, LixMNyX2 (M and N are from I
Group VIII metals, X is chalcogenation of oxygen, sulfur, etc.
Show compound. ). For example, lithium-co
Baltic complex oxide or lithium-manganese complex
Metal compounds such as oxides, disulfides,
Roll, polyaniline, polyparaphenylene, polyace
Conductive polymer compounds such as Tylene and polyacene-based materials,
Pseudo-graphite structure carbon materials, etc.
It is not specified. Further, as the negative electrode active material 24,
Include the following battery electrode materials. That is, carbon
Such as carbonaceous materials, especially graphite materials,
Analysis result of raw material by X-ray diffraction or the like; Lattice spacing (d002) 3.33 to 3.05Å Size of crystallite in a-axis direction La 200Å or more Size of crystallite in c-axis direction Lc 200Å or more True density 2.00 to 2.25 g / cm³  In addition, anisotropic pitch is fired at a temperature of 2000 ° C or more.
Graphite material, desirably the above graphite material is Lc <10
0nm short fibrous carbon fiber or mesocarbon microphone
Robbies, but of course limited to these ranges
Not something. ] Metal oxides such as tin oxide and silicon oxide,
For the purpose of improving negative electrode characteristics
And materials modified by adding boron or boron.
The negative electrode active material 24 includes lithium metal, lithium
Luminium, lithium-lead, lithium-tin, lithium
-Aluminum-tin, lithium-gallium and wood
Although alloys containing lithium metal such as alloys are also used,
It is not limited to these. Also lithium metal
And lithium alloys, lithium-containing organic compounds
Or by electrochemical reduction in advance,
It is also possible to insert lithium in the carbonaceous material in advance.
is there. Even if the power generating element 10 has the above configuration, the present embodiment
The same effect as the non-aqueous electrolyte secondary battery can be obtained.
You. In addition, a non-aqueous electrolyte containing the power generating element shown in FIG.
The secondary battery is also the non-aqueous electrolyte of the present embodiment of the present invention described above.
Can be manufactured by a method for manufacturing a quality secondary battery.

[0032]

The non-aqueous electrolyte secondary battery of the present invention described above has high airtightness and can prevent short-circuit and liquid leakage due to vibration, impact, bending and the like. In addition, there is an advantage that manufacturing is easy, safety, workability, and productivity are high, and costs are reduced due to fewer steps. In addition, since the entire peripheral edge portion is sealed at substantially the same time, the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminate film according to an embodiment.

FIG. 2 is a sectional view of the nonaqueous electrolyte secondary battery according to the embodiment;

FIG. 3 is a cross-sectional view of the non-aqueous electrolyte secondary battery according to the embodiment, taken along line AA ′.
Sectional view

FIG. 4 is a method for manufacturing a non-aqueous electrolyte secondary battery according to an embodiment.

FIG. 5 is AA ′ of the non-aqueous electrolyte secondary battery according to the embodiment;
Sectional view

[Explanation of symbols]

 1. 1. Laminated film Resin film 3. 3. Fusing resin film Metal foil 5. Package 6. Positive electrode plate 7. Negative electrode plate 8. Separator 9. Pole group 10. Power generation element 11. Negative electrode terminal 12. Positive electrode terminal 13. Peripheral part 14. Indentation pattern 15. Cutting process 16. Drawing process 17. Connection process 18. Stacking step 19. Sealing step 20. Cutting step 21. Positive electrode current collector 22. Positive electrode active material 23. Negative electrode current collector 24. Negative electrode active material

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeyoshi Nosaka 2-3-1, Kosobe-cho, Takatsuki-shi, Osaka F-term in Yuasa Corporation (Reference) 5H011 AA09 AA17 CC02 CC06 CC10 DD03 DD06 DD13 EE04 FF02 KK04 5H029 AJ14 AJ15 AK02 AK03 AK05 AL06 AL07 AL12 AM00 AM01 BJ04 BJ12 BJ14 CJ03 CJ05 CJ28 DJ02 DJ04 DJ05 EJ01 EJ12 HJ15

Claims (7)

[Claims] An electric power generating element comprising a positive electrode, a negative electrode and a separator is provided in a laminate film package in which a fusible resin film is disposed on the inner surface of a metal foil. A non-aqueous electrolyte secondary battery in a mode in which an electrode terminal that is sealed and connected to each of a positive electrode and a negative electrode penetrates from the power generating element to the outside of the peripheral portion, and a part of the non-aqueous electrolyte in the power generating element is electrolyzed. A non-aqueous electrolyte secondary battery comprising a gel electrolyte having a high liquid retention property, wherein the entire periphery of the package is fused and sealed substantially simultaneously. 2. A laminated film package in which a fusible resin film is disposed on the inner surface of a metal foil, a power generation element comprising a positive electrode group composed of a positive electrode, a negative electrode, and a separator. A non-aqueous electrolyte secondary battery in a mode in which an electrode terminal that is sealed and connected to each of a positive electrode and a negative electrode penetrates from the power generating element to the outside of the peripheral portion, and a part of the non-aqueous electrolyte in the power generating element is electrolyzed. A non-aqueous electrolyte secondary battery comprising a gel electrolyte having a high liquid retention property, wherein an indentation pattern is substantially uniformly dispersed over the entire periphery of the package. 3. The non-aqueous electrolyte secondary according to claim 1, wherein a part of the fusible resin film protrudes from the peripheral portion where the electrode terminal is located. battery. 4. A drawing process of drawing a laminate film, and laminating or winding a separator, a positive electrode plate and a negative electrode plate through a gel electrolyte having a high electrolyte retention property to form an electrode group as a power generating element. Then, a connection step of connecting the positive electrode terminal and the negative electrode terminal and the electrode group, and the power generation element is included, in a mode of exposing the electrode terminals to the outside of the laminate film peripheral portion, a laminated film subjected to drawing processing, A method for manufacturing a non-aqueous electrolyte secondary battery, comprising: a laminating step of laminating a laminated film; and a sealing step of simultaneously pressing the entire periphery of the laminated laminating film and fusing and sealing the laminated film. 5. The method for producing a non-aqueous electrolyte secondary battery according to claim 4, wherein the sealing step is performed after reducing the atmosphere to a predetermined pressure. 6. The method according to claim 5, wherein the predetermined pressure is 0.5 atm or less. 7. The method according to claim 4, wherein said sealing step is a step of performing a pressing with a sheet member interposed in a region where the electrode terminals and the entire peripheral portion of the laminated film overlapped. 3. The method for producing a non-aqueous electrolyte secondary battery described in 1. above.