JP4449109B2 - Non-aqueous electrolyte secondary battery and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND 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 and encapsulated in a film-like package by fusion of resin at the peripheral edge, and a method for manufacturing the same. It is.
[0002]
[Prior art]
In recent years, portable devices for general users have been reduced in size and weight due to great advances in electronic technology.
Regarding the progress of miniaturization and weight reduction in terms of battery packaging, the material used in non-aqueous electrolyte sealed batteries has been changed from heavy materials such as iron or stainless steel to light materials such as aluminum. Yes. For example, as for the laminate film, the one in which an aluminum foil is used as a core material and a synthetic resin layer is disposed on both surfaces thereof is the mainstream.
[0003]
Next, a conventional method for producing a nonaqueous electrolyte secondary battery using the laminate film will be described.
In the conventional manufacturing method, first, the laminate film is formed into a bag shape by fusing and sealing the other laminate film periphery except for a part of the laminate film periphery for each battery.
Next, the periphery of the laminated film that is not fused and sealed is used as an opening, and a pole group consisting of a positive electrode plate, a negative electrode plate, and a separator, which are power generation elements, is inserted into the bag through the opening and a non-aqueous electrolyte is added inject.
Finally, the opening is sealed with the tip of the electrode terminal protruding from the opening.
The non-aqueous electrolyte secondary battery has been manufactured through the above steps.
[Problems to be solved by the invention]
[0004]
However, in the above conventional method for producing a nonaqueous electrolyte secondary battery, the peripheral edge of the laminate film other than the opening is fused and then the opening is fused after pressure reduction or liquid injection. For this reason, it has been necessary to perform fusion sealing at the periphery of the laminate film twice or more. By performing the fusion sealing twice or more in this way, unevenness such as wrinkles occurs at the peripheral edge of the laminate film, particularly the peripheral edge of the laminate film from which the lead tip protrudes, and the sealing performance of the nonaqueous electrolyte secondary battery is improved. There are problems such as a decrease in yield and a significant decrease in yield.
[0005]
The present invention has been made in view of the above problems in the prior art, and improves the yield, improves the sealing performance, and reduces the number of processes, thereby reducing the number of steps and increasing the productivity of an inexpensive nonaqueous electrolyte secondary battery. And its manufacturing method.
[0006]
[Means for Solving the Problems]
The first invention of the present application that solves the above-mentioned problems has a power generation element comprising a pole group composed of a positive electrode, a negative electrode, and a separator in a laminate film package in which a fusible resin film is arranged on the inner surface of a metal foil. A nonaqueous electrolyte secondary battery in which a peripheral portion of such a package is fused and sealed, and electrode terminals connected to each of a positive electrode and a negative electrode penetrate from the power generation element to the outside of the peripheral portion, In the non-aqueous electrolyte secondary battery, a part of the element is made of a gel electrolyte having a high electrolytic solution retention property, and the entire peripheral edge of the package is fused and sealed almost simultaneously.
[0007]
Therefore, according to the nonaqueous electrolyte secondary battery of the first invention of the present application, since the entire peripheral edge portion of the package is fused and sealed at the same time, there is an advantage that the sealing performance is improved and the yield is improved. is there.
[0008]
Further, the second invention of the present application provides a power generation element composed of a non-aqueous electrolyte and a pole group composed of 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 nonaqueous electrolyte secondary battery in which the peripheral portion of the package is fused and sealed, and the electrode terminals connected to each of the positive electrode and the negative electrode penetrate from the power generation element to the outside of the peripheral portion, A non-aqueous electrolyte secondary battery in which a part of the power generation element is made of a gel electrolyte having a high electrolyte retention property, and an indentation pattern is distributed substantially uniformly on the entire periphery of the package. .
[0009]
Therefore, according to the nonaqueous electrolyte secondary battery of the second invention of the present application, since the indentation pattern is distributed substantially uniformly on the entire periphery of the package, the strength of the entire package is improved, and the sealing property is improved. Can be improved. In addition, a defective product can be reliably found by using a pattern related to product inspection as an inspection index.
Moreover, the outflow of resin at the time of fusion sealing can be prevented. Furthermore, stress such as thermal expansion of the laminate film can be dispersed, and the sealing performance can be improved.
[0010]
The third invention of the present application is characterized in that a part of the fusible resin film protrudes from the peripheral edge where the electrode terminal is located.
[0011]
Therefore, according to the nonaqueous electrolyte secondary battery of the third invention of the present application, since the 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 is covered with the fusible resin film, and it is possible to prevent the electrode terminal from touching the package by bending or the like and leaking current.
Further, stress concentration on the entire peripheral edge of the package is avoided, and the strength of the entire package is improved.
Furthermore, there is an advantage that stress concentration at the peripheral portion of the package where the electrode terminal is located is avoided, the sealing property is improved, and the strength is improved.
Moreover, since the peripheral part of the package in which an electrode terminal is located has a uniform crimping | compression-bonding surface with the said meltable resin film, airtightness is improved.
[0012]
The fourth invention of the present application is a drawing process for drawing a laminate film,
A step of laminating or winding the separator, the positive electrode plate and the negative electrode plate via a highly liquid-retaining gel electrolyte to form a pole group which is a power generation element, and connecting the positive electrode terminal and the negative electrode terminal to the pole group; ,
In an aspect in which the power generation element is included and the electrode terminals are exposed to the outside of the peripheral portion of the laminate film, the laminating step of superimposing the laminate film and the laminate film subjected to drawing processing,
A sealing process in which all the peripheral edges of the laminated laminate film are simultaneously pressed and fused and sealed;
It is a manufacturing method of the nonaqueous electrolyte secondary battery characterized by comprising.
[0013]
Therefore, according to the method for manufacturing a nonaqueous electrolyte secondary battery of the fourth invention of the present application, a drawing process for drawing the laminate film,
A connecting step of laminating or winding a separator, a positive electrode plate, and a negative electrode plate via a gel electrolyte having high electrolyte retention, forming a pole group that is a power generation element, and connecting the positive electrode terminal and the negative electrode terminal to the pole group When,
In an aspect that includes the power generation element and is exposed to the outside of the peripheral portion of the electrode terminal laminate film, an overlapping step of superimposing the laminate film and the laminate film subjected to drawing processing,
A sealing step of simultaneously pressing all the peripheral edges of the laminated laminate film, and fusing and sealing;
Therefore, there is an advantage that productivity and workability are improved without requiring a complicated process.
Further, since the gel electrolyte having a high liquid retaining property is employed, the laminate film can be safely sealed by fusion without leaking.
In addition, since all the peripheral edge portions of the laminated laminate film are simultaneously fused and sealed in the sealing step, it is possible to prevent defects at the time of fusion sealing and improve the yield.
[0014]
The fifth invention of the present application is characterized in that the sealing step is performed after reducing the atmosphere to a predetermined pressure.
[0015]
Therefore, according to the nonaqueous electrolyte secondary battery manufacturing method of the sixth invention of the present application, since the sealing step is performed after reducing the atmosphere to a predetermined atmospheric pressure, the adhesion between the electrode groups is improved, As a result, battery characteristics are improved.
[0016]
The sixth invention of the present application is characterized in that the predetermined atmospheric pressure is 0.5 atmospheric pressure or less.
[0017]
Battery characteristics improve with reduced pressure. From such a viewpoint, it is preferable that the degree of decompression is higher.
However, when the degree of decompression is increased, much time and large-scale equipment are required.
Therefore, by setting the specified atmospheric pressure to about 0.5 atm or less, it is possible to reduce the time required for decompression without requiring large-scale equipment required for decompression, and shorten the cycle time of the production line. it can. That is, workability and productivity can be improved, and the cost can be further reduced to facilitate industrial application.
[0018]
In addition, the seventh application of the present application is characterized in that the sealing step is a step of pressing with a sheet member interposed in a polymerization region with the entire peripheral edge of the laminated film overlapped with the electrode terminal. .
[0019]
Therefore, according to the method for manufacturing a non-aqueous electrolyte secondary battery of the seventh invention of the present application, the sealing step includes a sheet member in a polymerization region with the entire peripheral edge of the laminate film overlapped with the electrode terminal. Since it is characterized by the step of performing the intervening pressing, there is an advantage that the sealing can be performed safely and reliably without applying heat or mechanical load to the electrode terminal.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a nonaqueous electrolyte secondary battery and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings.
[0021]
Embodiment
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 the bottom, and FIG. 3 is an embodiment of the present invention. It is AA 'sectional drawing of a nonaqueous electrolyte secondary battery.
First, the structure of the laminate film of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention will be described with reference to FIG.
The laminate film 1 has a triple structure, a resin film 2 such as high-strength polyethylene terephthalate or nylon is arranged on the outer surface as a protective layer, a fusible resin film 3 such as modified polypropylene is arranged on the inner surface, and a core material It is comprised by arrange | positioning metal foil 4, such as aluminum foil.
Also, the fusible resin film 3 is an acid-modified polyolefin, ionomer, ethylene-vinyl acetate copolymer, ethylene-acrylic having good adhesion to the base material of the laminate 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, it is possible to use polypropylene or polyethylene as long as a metal adhesive layer is provided at the connection portion with the terminal.
[0022]
Next, with reference to FIG.2 and FIG.3, the structure of the nonaqueous electrolyte secondary battery of embodiment of this invention is demonstrated.
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 and an electrolysis are provided in a laminate film package (hereinafter, package 5). It has the electric power generation element 10 which consists of the pole group 9 comprised with a gel electrolyte (not shown) with high liquid retainability.
Further, the power generation element 10 is configured by stacking two pole groups 9 inside the package 5. Further, the negative electrode plate 7 of the power generation element 10 is connected to the negative electrode terminal 11, and the positive electrode plate 6 is connected to the positive electrode terminal 12. In addition, the electric power generation element 10 has a gel electrolyte having a high electrolytic solution retention property, and has an effect of preventing leakage. Further, the gel electrolyte is impregnated in the porous substrate of the separator 8, but it is not limited to this because it may be applied or impregnated in one or more elements of the power generation element 10.
Furthermore, the gel electrolyte used in the non-aqueous electrolyte secondary battery of the present embodiment has, for example, a heavy polymer formed by polymerizing from a monomer having an alkyl skeleton containing fluorine and having a polymerizable functional group in the molecular structure as a functional group. Assume that the coalescence is formed in a solid form as a gel skeleton matrix. In addition, 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. A polymerization product obtained by polymerizing a monomer containing fluorine has an alkane containing fluorine in the skeleton, and therefore has little interaction with solvent molecules and solute molecules. In addition, it is chemically and electrochemically stable. Further, although the acid ester structure remains in the main skeleton, it is preferable to employ the above gel electrolyte because the syneresis of the solvent can be prevented by the presence of an appropriate polar group.
Further, the above gel electrolyte will be described in more detail. Polyethylene oxide, polyethylene oxide copolymer, polyacrylonitrile, polyvinylidene fluoride, polyvinylidene fluoride copolymer, propylene hexafluoride copolymer, polymethyl methacrylate, polyacrylamide, It is preferable to use a polycarbonate or a crosslinked product having a straight-chain or equihetero atom in the polymer molecule having an equihetero atom in the polymer molecule.
[0023]
In addition, a substantially uniform indentation pattern 14 is arranged on the peripheral portion 13 of the package 5 in order to improve the sealing performance.
The indentation pattern 14 is formed on the peripheral edge 13 when the package is sealed by a tool end face (not shown) that presses and seals the peripheral edge 13. That is, the indentation pattern 14 is formed by transferring a pattern (not shown) provided on the tool end face.
Here, the indentation pattern 14 being substantially uniform means that the same indentation pattern 14 as the pattern existing on the tool end face is formed on the peripheral edge portion 13 by a single sealing step. Therefore, the indentation pattern 14 is not substantially uniform when a composite pattern is formed by pressing with a tool a plurality of times.
On the other hand, when the spacing between patterns (for example, dot spacing) formed in advance on the tool end surface is non-uniform, the pattern on the tool end surface is non-uniform and discontinuous. The indentation pattern 14 on the peripheral edge 13 may be non-uniform and discontinuous.
In this case, as long as only the same indentation pattern 14 as the pattern on the tool end face exists in the peripheral edge portion 13, this corresponds to the case where the indentation pattern 14 according to the present invention is substantially uniform.
As described above, the peripheral edge portion 13 of the package 5 is obtained by melting and sealing all the peripheral edge portions 13 substantially at the same time, so that the generation of wrinkles is not observed, the hermeticity and airtightness are improved, and the yield is improved. There is an improved effect.
[0024]
Next, a method for manufacturing a nonaqueous 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 the cutting step 15, the laminate film 1 is cut into a predetermined size, for example, a shape close to the final product.
Next, in a drawing process 16, drawing is performed on a laminate film (not shown) cut to a predetermined size.
[0025]
In addition, after applying or impregnating a gel electrolyte (not shown) having a high electrolyte solution retention property to one surface of the separator 8 that contacts the positive electrode plate 6 and one surface of the separator 8 that contacts the negative electrode plate 11 in the connecting step 17, After the separator 8, the positive electrode plate 6, and the negative electrode plate 7 are stacked or wound to form the electrode group 9 that is 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 the present embodiment, the separator 8 is applied or impregnated with the gel electrolyte, but all or one or more of the separator 8, the positive electrode plate 12, and the negative electrode plate 11 may be applied or impregnated.
[0026]
Next, in the stacking step 18, the drawn laminate film (not shown) that has undergone the drawing step 16 is placed on the lower surface, and the power generating element 10 is mounted at a predetermined position. At that time, the power generation element 10 is mounted in such a manner that the positive electrode terminal 12 and the negative electrode terminal 11 connected to the power generation element 10 protrude to a part of the peripheral edge portion 13 of the squeezed laminated film. Thereafter, a non-drawing laminate film cut to a predetermined size that has not been drawn is overlaid from above.
[0027]
Next, in the sealing step 19, the atmosphere of the laminated film (not shown) that is superimposed is reduced in pressure.
At that time, the higher the degree of vacuum, the better the battery characteristics. Battery characteristics improve with reduced pressure. From such a viewpoint, it is preferable that the degree of decompression is higher.
However, when the degree of decompression is increased, much time and large-scale equipment are required.
Therefore, by setting the predetermined atmospheric pressure to 0.5 atmospheric pressure or less, large-scale equipment required for decompression is not required, the time required for decompression can be shortened, and the cycle time of the production line can be shortened. There is an advantage that can be realized. That is, workability and productivity can be improved, and the cost can be further reduced to facilitate industrial application.
After decompression, all the peripheral edge portions 13 of the laminated laminate film are fused and sealed almost simultaneously to form a package.
The term “substantially simultaneous” as used herein means that all the peripheral edge portions 13 of the laminated film substantially overlapped in one step are fusion-sealed.
In addition, the peripheral edge portion 13 of the laminated film and the peripheral edge portion 13 of the package indicate the same position.
[0028]
In this way, in the sealing step 19, all the peripheral edge portions 13 are fused and sealed almost simultaneously. By setting it as such a process, generation | occurrence | production of the nonuniformity of the wrinkles etc. which had arisen at the time of the conventional partial pressure bonding sequentially can be prevented, and the airtightness of the battery can be improved.
Here, a method for 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 heat is generated from the metal body itself by applying a high frequency to the metal. The heat block method generates heat from a tool end surface (not shown) that presses the peripheral edge portion 13 of the peripheral edge portion 13 of the package, heats the fusible resin film 3 of the laminated film that is stacked when the tool end surface 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 also in the sense that the resin film 2 on the top surface of the laminate film 1 is not deteriorated.
Further, by providing a pattern (not shown) on the tool end surface pressed against the peripheral edge portion 13 of the package 5 at the time of fusion sealing, the indentation pattern 14 can be formed on the peripheral edge portion 13 of the package 5. By forming the indentation pattern 14 on the peripheral edge portion 13 of the package 5, the hermeticity and airtightness of the package 5 can be further improved.
In this case, the peripheral portion 13 where the positive electrode terminal 12 and the negative electrode terminal 11 are located causes a short circuit if the pattern provided on the tool end surface penetrates the positive electrode terminal 12 or the negative electrode terminal 11 when forming the indentation pattern 14. However, a film (not shown) made of a material such as plastic or resin is mounted on the peripheral edge portion 13 where the positive electrode terminal 12 and the negative electrode terminal 11 on which the pattern provided on the tool end surface is pressed, and is applied from the tool end surface. Such problems can be solved by controlling the pressure. Further, the indentation pattern 14 formed by the nonaqueous electrolyte secondary battery manufacturing method of the present embodiment is not formed by a film, but a pattern formed by transferring the pattern of the tool end surface is here. Is an indentation pattern 14.
The amount of heat generated from the metal (temperature) 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 strength of the high frequency is constant and the types of the target metal bodies are the same, the calorific value is in inverse proportion 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 has a larger distance from the tool end surface than the other peripheral portions 13. The temperature is controlled and the temperature is lower than that of the other peripheral edge portion 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.
Moreover, when employ | adopting a heat block system, it is desirable to make the said film low thermal conductivity also in the meaning which does not degrade the laminate film 1, the positive electrode terminal 12, and the negative electrode terminal 11. FIG.
Moreover, when using in the aspect which coat | covers a film to two or more electrode terminals (not shown), it is preferable to employ | adopt an insulating film especially in order to prevent the short circuit by the electricity supply between 2 poles of a positive electrode and a negative electrode.
[0029]
Next, the decompression is released in the cutting step 20, and the peripheral edge of the package is cut at a predetermined position.
In addition, by cutting the portion 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 pressure bonding covers the base of the positive electrode terminal 12 and the negative electrode terminal 11. It becomes an aspect. As a result, stress concentration at the peripheral portion 13 located at the base of the positive electrode terminal 12 and the negative electrode terminal 11 is avoided, and the strength of the package 5 is improved.
Further, the nonaqueous electrolyte secondary battery of the present embodiment is charged after passing through the cutting step 20.
[0030]
In the non-aqueous electrolyte secondary battery and the manufacturing method thereof according to the embodiment of the present invention, the laminated film that has been subjected to drawing processing and the laminated film that has not been subjected to drawing processing are overlapped and the steps are sequentially performed. However, the method for producing a nonaqueous electrolyte secondary battery of the present invention can also be performed by laminating laminated films that have been drawn.
Also, the process sequence of the cutting process 15 for cutting the laminate film to a predetermined dimension and the drawing process 16 for the laminate film are reversed, the drawing process is performed on the laminate film before cutting, and then the laminate film is cut to a predetermined dimension. Then, the process may proceed sequentially.
Further, after drawing one long laminate film, the power generation element 10 obtained in the connecting step 17 is mounted at a predetermined position of the one laminate film, and the other long laminate film (drawing With processing or without drawing). Then, it is also possible to cut | disconnect the laminated film used as the package to the predetermined dimension through the sealing process 19. FIG.
[0031]
Further, another configuration example of the power generation element which is one component of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention described above will be described with reference to FIG.
FIG. 5 is a cross-sectional view of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention shown in FIG.
Among the power generation elements 10 constituted by the pole group 9, the positive electrode plate 6 is composed of a positive electrode current collector 21 such as aluminum and a positive electrode active material 22, and the negative electrode plate 7 is composed of a negative electrode current collector 23 such as copper and a negative electrode. And an active material 24.
Examples of the positive electrode active material 22 include the following battery electrode materials.
That is, CuO, Cu₂O, Ag₂O, CuS, CuSO₄Group I metal compounds such as TiS₂, SiO₂, Group IV metal compounds such as SnO, V₂O₅, V₆O₁₂, VO_x, Nb₂O₅, Bi₂O₃, Sb₂O₃Group V metal compounds such as CrO₃, Cr₂O₃, MoO₃, MoS₂, WO₃, SeO₂Group VI metal compounds such as MnO₂, Mn₂O₃Group VII metal compounds such as Fe₂O₃, FeO, Fe₃O₄, Ni₂O₃, NiO, CoO₃, Group VIII metal compounds such as CoO, or the general formula LixMX₂LixMNyX2 (M and N are metals of Group I to VIII, X is a chalcogen compound such as oxygen and sulfur). For example, metal compounds such as lithium-cobalt composite oxide or lithium-manganese composite oxide, and conductive polymer compounds such as disulfide, polypyrrole, polyaniline, polyparaphenylene, polyacetylene, and polyacene materials, pseudo graphite Although it is a structural carbon material etc., it is not limited to these.
Further, examples of the negative electrode active material 24 include the following battery electrode materials.
That is, carbonaceous materials such as carbon, especially graphite materials,
[For example, the carbonaceous material is analyzed by X-ray diffraction or the like;
Lattice spacing (d002) 3.33 to 3.05 mm
a-axis direction crystallite size La 200 or more
c-axis direction crystallite size Lc 200ｃ or more
True density 2.00 to 2.25 g / cm³
Further, a graphite powder obtained by firing an anisotropic pitch at a temperature of 2000 ° C. or higher, desirably, the graphite material is a short fibrous carbon fiber or mesocarbon microbead having Lc <100 nm. It is not limited to. ] Metal oxides such as tin oxide and silicon oxide, and materials modified by adding phosphorus or boron to the above electrochemically active substance for the purpose of improving the negative electrode characteristics. The negative electrode active material 24 may be lithium metal-containing alloys such as lithium metal, lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy, but is not limited thereto. Is not to be done. It is also possible to insert lithium into the carbonaceous material in advance by using lithium metal, a lithium alloy, or an organic compound containing lithium in advance, or by electrochemical reduction in advance.
Even when the power generation element 10 is configured as described above, the same effects as those of the nonaqueous electrolyte secondary battery of the present embodiment can be obtained.
Further, the non-aqueous electrolyte secondary battery including the power generation element shown in FIG. 5 can also be manufactured by the method for manufacturing the non-aqueous electrolyte secondary battery of the present embodiment described above.
[0032]
【The invention's effect】
The non-aqueous electrolyte secondary battery of the present invention described above has high airtightness, and can prevent a short circuit or leakage due to vibration, impact, bending, or the like. In addition, manufacturing is easy, safety, workability, and productivity are high, and there are advantages in that costs are reduced because there are fewer steps. In addition, since the entire peripheral edge is fused and sealed almost simultaneously, the yield can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a laminate film of 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 taken along the line A-A ′ of the nonaqueous electrolyte secondary battery according to the embodiment.
FIG. 4 shows a method for manufacturing a nonaqueous electrolyte secondary battery according to an embodiment.
FIG. 5 is a cross-sectional view taken along the line A-A ′ of the nonaqueous electrolyte secondary battery according to the embodiment.
[Explanation of symbols]
1. Laminate film
2. Resin film
3. Fusible resin film
4). Metal foil
5. package
6). Positive plate
7). Negative electrode plate
8). Separator
9. Polar group
10. Power generation element
11. Negative terminal
12 Positive terminal
13. Peripheral part
14 Indentation pattern
15. Cutting process
16. Drawing process
17. Connection process
18. Overlapping process
19. Sealing process
20. Cutting process
21. Positive electrode current collector
22. Cathode active material
23. Negative electrode current collector
24. Negative electrode active material

Claims (5)

A laminate film package in which a fusible resin film is disposed on the inner surface of a metal foil has a power generation element composed of an electrode group composed of a positive electrode, a negative electrode, and a separator, and the peripheral portion of the package is fused and sealed. And an electrode terminal connected to each of the negative electrodes is a non-aqueous electrolyte secondary battery having a form that penetrates from the power generation element to the outside of the peripheral portion, and a part of the power generation element has high electrolyte retention A non-aqueous electrolyte secondary battery comprising a gel electrolyte, wherein all peripheral edges of the package are fused and sealed substantially simultaneously, and an indentation pattern is distributed substantially uniformly on the entire peripheral edge of the package. The non-aqueous electrolyte secondary battery according to claim 1, wherein a part is characterized by comprising in a manner that projection of the fusible resin film in the periphery of the electrode terminal is located. A drawing process for drawing a laminate film, and a separator, a positive electrode plate, and a negative electrode plate are laminated or wound through a gel electrolyte having a high electrolyte holding property to form a pole group as a power generation element, and a positive electrode terminal and A connecting step of connecting a negative electrode terminal and the electrode group, and laminating the laminated film and the laminated film that have been subjected to drawing processing in such a manner that the power generation element is included and the electrode terminal is exposed outside the peripheral edge of the laminated film. and superimposing step of combining, the sealing step of simultaneously pressing the entire periphery of the superposed laminated film, fused sealed mouth, Tona is, the sealing step, the entire periphery of the laminate film superimposed to the electrode terminal A method for producing a non-aqueous electrolyte secondary battery, characterized in that the step of pressing with a sheet member interposed is performed in a polymerization region with the portion . The method for producing a nonaqueous electrolyte secondary battery according to claim 3 , wherein the sealing step is performed after reducing the atmosphere to a predetermined pressure. The method for producing a non-aqueous electrolyte secondary battery according to claim 4 , wherein the predetermined atmospheric pressure is 0.5 atmospheric pressure or less.

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