JPH10241651A - Rectangular non-aqueous electrolytic solution battery and manufacture of opening-sealing plate of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of a safety mechanism for preventing blowout/firing caused by misoperations such as short-circuiting, overcharging, and reverse charging, and provide an opening-sealing structure of high productivity and its manufacturing method. SOLUTION: This structure is equipped with a rectangular case 1, which houses a group of electrode plates 11 and electrolytic solution in its interior, an opening-sealing plate 2 which seals an opening part of the rectangular case 1 and is provided with a safety valve, a rivet 5 which is inserted in a center part of the opening-sealing plate 2 and also serves as a terminal, and resin 6 which insulates the opening-sealing plate 2 and the rivet 5. Further, the opening-sealing plate 2, made up of a clad plate wherein metallic foil is attached under pressure to one side of a flat plate-like lid plate 2a, the safety valve 3 which is made up by covering only an under part of a hole part for safety valve provided in the lid plate 2a by metallic foil, or by covering the entire under part of the lid plate, the rectangular case 1 and the opening-sealing plate 2 are laser-welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin rectangular battery, and more particularly to a sealing plate structure and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, with the recent trend toward cordless and portable AV equipment and personal computers, demands for smaller, lighter, and higher energy densities for batteries as power sources for driving the same have been increasing. In particular, a lithium secondary battery is a battery having a high energy density, is expected as a next-generation main battery, and has a large potential market scale. As for the shape, there is an increasing demand for a rectangular shape from the viewpoint of making the communication device thinner or effective use of space.

In a lithium secondary battery using a lithium metal or a carbon material as a negative electrode, in the case of short-circuit, overcharge, reverse charge, etc., gas is generated and accumulated in the battery due to decomposition of an electrolyte or an active material, and the internal pressure of the battery is reduced. There was a sudden rise.

In order to prevent such a sudden increase in the internal pressure of the battery, there is provided an explosion-proof valve which is deformed with an increase in the internal pressure as shown in Japanese Patent Application Laid-Open No. 2-112151.
An explosion-proof device has been proposed in which, when a battery internal pressure value reaches a predetermined value, an explosion-proof valve breaks and gas stored in the battery is discharged outside the battery.

[0005]

However, a battery provided with a sealing plate as described above has a complicated current cut-off mechanism or an explosion-proof structure. Therefore it was difficult. Further, in order to obtain a desired battery, it is necessary to provide a number of inspection steps in the manufacturing process, and the productivity of the battery has been reduced.

An object of the present invention is to provide a sealing plate structure provided with an explosion-proof structure for the purpose of enhancing reliability and a method of manufacturing the same.

[0007]

According to the present invention, there is provided a rectangular case for accommodating an electrode plate group and an electrolytic solution therein, a sealing plate for sealing an opening of the rectangular case and having a safety valve, and a sealing plate. A rivet also serving as a terminal inserted in the center of the sealing plate, and a resin for insulating the rivet from the sealing plate.The sealing plate is constituted by a clad plate obtained by pressing a metal foil on one surface of a flat lid plate. The safety valve is constituted by covering only the lower part of the safety valve hole provided in the cover plate with metal foil, or covering the entire lower surface of the cover plate, and the square case and the sealing plate are laser-welded. It is.

Thus, when the internal pressure of the battery rises due to short-circuiting, overcharging, reverse charging, etc., the metal foil of the safety valve provided on the sealing plate breaks and gas in the battery is discharged, so that the temperature of the battery rises sharply. And an increase in battery internal pressure can be effectively prevented.

[0009] A hole for a safety valve is formed at regular intervals in a metal hoop material constituting a cover plate of a sealing plate, and a metal foil is continuously pressed to close the hole, thereby producing a clad plate. Can be continuously produced and supplied.

At this time, if the hole for the safety valve is elliptical, a small portion of the arc is selectively broken, and the operating pressure of the safety valve can be designed depending on the size of the arc, and the reliability is improved.
Drill holes for rivets at regular intervals in this hoop material,
A resin that secures insulation between the rivet and the sealing plate is molded. Then, insert a nickel-plated iron rivet and washer and crimp the rivet to assemble the sealing plate.

With such a structure, a manufacturing method in which a sealing plate provided with a safety valve is continuously assembled as a hoop material becomes possible, so that productivity and reliability are improved. Inspection of the lower limit operating pressure of the safety valve can be performed continuously with the hoop material. By manufacturing in this way, a highly reliable sealing plate can be manufactured with high productivity.

It is preferable that the resin to be molded be a polyphenylene sulfide resin because the heat resistant temperature increases. By making the periphery of the rivet insertion hole at the center of the sealing plate concave into a concave shape, the internal volume of the battery can be effectively used.

The material may be constituted by an aluminum sealing plate, a nickel-plated iron rivet, and a washer, or may be constituted by a nickel-plated iron sealing plate, an aluminum rivet, and a washer.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the prismatic nonaqueous electrolyte battery of the present invention, an electrode plate group including a positive electrode, a negative electrode, and a separator, a rectangular case made of aluminum for accommodating an electrolyte therein, and an opening of the rectangular case are formed. Sealing, a sealing plate made of a clad plate in which metal foil is crimped at the lower part of the safety valve hole, a rivet also serving as a terminal inserted in the center of the sealing plate, and a resin that insulates the sealing plate and the rivet, The rectangular case and the sealing plate are laser-welded rectangular non-aqueous electrolyte batteries.

A sealing plate provided with a liquid inlet, a rivet insertion hole in the center of the sealing plate having a concave recess, a safety valve hole having an elliptical shape, and a sealing plate. It is also possible to use a clad plate in which a metal foil is pressure-bonded to the entire lower surface of the cover plate, not only the lower part of the safety valve hole of the cover plate.

When the injection port is opened in the sealing plate,
It is preferable that the liquid injection path is provided from the liquid injection port provided at one position of the sealing plate to a space formed by the inside of the corner of the rectangular case and the outside of the elliptical electrode plate group.

In order to ensure electrical conduction between the electrode group and the rivet also serving as a terminal, it is preferable to arrange a metal washer between them.

In the method for producing a sealing plate for a rectangular nonaqueous electrolyte battery according to the present invention, a step of continuously providing a hole for a safety valve in a part of a long thin sheet-like hoop material of aluminum constituting a lid plate of the sealing plate is provided. And a step of crimping a band-shaped aluminum foil so as to cover the hole for the safety valve, a step of continuously providing a hole for inserting a nickel or nickel-plated metal rivet in the center of the hoop material, Molding the insulating resin, inserting the rivet into the hole provided in the central portion, caulking, and transporting the hoop material to the battery assembling process, and cutting and processing each sealing plate. . When the sealing plate has a liquid inlet, a step of continuously providing a liquid inlet between the step of continuously forming the rivet insertion hole and the step of molding the insulating resin in the hoop material is added. When a washer is used, a nickel or nickel-plated metal washer is provided between the step of molding the insulating resin into the hoop material and the step of caulking by inserting the rivet into a hole provided in the center. Is added.

It is also possible that the square case, the cover plate for the sealing plate and the metal foil are made of nickel or nickel-plated iron, and the rivets or washers are made of aluminum.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a prismatic nonaqueous electrolyte battery according to the present invention. Reference numeral 1 denotes an aluminum square case.
Reference numeral 2 denotes a sealing plate, which is made of a clad plate in which an aluminum foil 2b is crimped on an aluminum flat cover plate 2a, and a safety valve 3 is provided. The safety valve 3 is formed by pressing an aluminum foil 2b on the lower surface of the safety valve hole 4 of the cover plate 2a. This sealing plate 2 is a square case 1
And laser welded. Reference numeral 5 also serves as a nickel-plated iron terminal and is provided with a rivet disposed at the center of the sealing plate 2, reference numeral 6 denotes a resin insulating gasket molded on the sealing plate 2, and reference numeral 7 denotes a nickel-plated iron washer. is there. The rivet 5 is inserted into the opening at the center of the sealing plate 2, and after placing a washer 7 at the lower part of the rivet 5, the rivet is caulked to establish an electrical connection between the rivet and the washer, and the lid plate and the rivet are connected. The insulation between them is also secured. Reference numeral 8 denotes an exhaust hole formed in the molded insulating resin. Reference numeral 9 denotes a liquid injection port opened in the cover plate, and reference numeral 10 denotes a space formed by the inside of the corner of the rectangular case and the outside of the elliptical electrode plate group. This is a groove provided to guide the robot toward itself. 11
Is a group of electrode plates obtained by winding a positive electrode plate and a negative electrode plate through a separator and pressing them into an oval shape. Reference numeral 12 denotes an aluminum current collecting lead taken out of the positive electrode plate and welded to the lid plate. Reference numeral 13 denotes a nickel current collecting lead taken out of the negative electrode plate and welded to the washer 7. Therefore, as a battery, a case is a positive electrode and a terminal made of rivets is a negative electrode. In this sealing plate, when gas accumulates in the battery and the internal pressure of the battery rises during short-circuiting, overcharging, reverse charging, etc. of the battery, the aluminum foil 2b provided on the sealing plate
Is broken, and the gas in the battery is exhausted, whereby it is possible to prevent a sharp rise in the internal pressure of the battery.

Hereinafter, a method for manufacturing the sealing plate will be described with reference to a flowchart shown in FIG. In the structure of the sealing plate of the present invention, rather than assembling each sealing plate as a part, it is possible to assemble the hoop material constituting the lid plate of the sealing plate, it is also possible to inspect in this state, A sealing plate can be manufactured continuously.

A hole for a safety valve was continuously formed at predetermined intervals in an aluminum hoop material having a predetermined size, and an aluminum foil was pressed by rolling so as to cover the lower portion of the hole.
Thereby, the safety valve could be continuously formed in the hoop material.

FIG. 3 shows a schematic view of the appearance. The hoop material had a thickness of 0.6 mm, and the aluminum foil had a thickness of 0.030 mm. Next, a pilot hole for securing positioning of the hoop material was opened. In the case of forming a sealing plate in which the periphery of the rivet insertion hole is concavely concave, a predetermined place is drawn in the next step. Next, after a hole for inserting a rivet is formed, an insulating resin is molded around the hole. These steps are also performed continuously with the hoop material.

The safety valve pinhole inspection and the safety valve lower limit operating pressure inspection were performed in the following steps. A sealant is applied to a portion where the rivet and the insulating resin mold are in contact. A coal tar pitch agent was used as a sealing agent. After applying the sealant, rivets and washers are inserted and fixed. Through the above steps, the sealing plate can be continuously manufactured on the hoop material. FIG. 4 shows a schematic diagram of the appearance. This hoop material is supplied to a battery assembling step, and is punched to a predetermined size to form a sealing plate before welding the electrode plate group and the sealing plate.

The prismatic nonaqueous electrolyte battery of the present invention was produced as follows. The positive electrode plate is composed of LiCoO2 as an active material, carbon black as a conductive agent, and an aqueous dispersion of polytetrafluoroethylene as a binder in a solid weight ratio.
A mixture in a ratio of 100: 3: 10 is applied to both sides of an aluminum foil, dried, rolled, and then cut into a predetermined size. A positive electrode lead plate made of aluminum is welded to this.

The negative electrode plate is mainly composed of a carbonaceous material, and is mixed with a styrene-butadiene rubber-based binder in a weight ratio of 100: 5.
Is coated on both sides of a copper foil, dried, rolled, and then cut into a predetermined size. A nickel negative electrode lead is welded to this. The separator is a polyethylene microporous film. The positive electrode plate and the negative electrode plate are wound around a separator to form an electrode plate group having an oblong upper surface.

The lead of the electrode group is welded to the sealing plate and inserted into the rectangular battery case, and the sealing plate and the case are sealed by laser welding. As shown in FIG. 1, the positive electrode lead was laser spot welded to the aluminum sealing plate cover plate, and the negative electrode lead was resistance welded to a nickel-plated iron washer. Next, a predetermined amount of electrolyte is injected from the injection port. In the present embodiment, a pipe with a rubber ring attached to the tip is inserted into the liquid inlet. The pipe has a three-way cock, one connected to the battery, one connected to the vacuum pump, and the other connected to the pump containing the electrolyte.

The pressure inside the battery is reduced by a vacuum pump through a pipe. Next, the cock was switched and the electrolyte was injected by a method of injecting the electrolyte from a pump. Once the inside of the battery is depressurized, the injection of the electrolyte becomes easy. As the electrolyte, a solution prepared by dissolving lithium hexafluorophosphate at a concentration of 1 mol / l as a solute in a solvent obtained by mixing ethylene carbonate (EC) and diethyl carbonate (DEC) at a molar ratio of 1: 3 was used. . (Example 1) A resin mold material for insulating the sealing plate and the rivet will be described. As a resin material, polypropylene (PP) is generally used in nonaqueous electrolyte batteries. Since this resin has good moldability and low cost, it is widely used in coin-type lithium batteries and the like, but deterioration during high-temperature storage of batteries has been a problem. In addition, since the strength is low and the deformation is large, when used for the resin in the caulked sealing portion, 50
Compression is performed until the compression ratio becomes about 70%. Since the sealing plate of the present invention is laser-welded to a case, there is a concern that the sealing plate may be affected by heat. Therefore, it is desired that the resin be relatively thermally stable. When caulking with a rivet, the amount of deformation of the resin is better because the diameter of the rivet is very small, and it is desirable to reduce the compression ratio of the resin to about 30%. In this example, three types of resins, namely, polypropylene (PP), polyethylene terephthalate (PET) and polyphenylene sulfide (PPS) were narrowed down and evaluated by referring to existing data such as resistance to organic solvents from about 20 types of resins. A sealing plate and a battery were prepared using these resins, and a battery leakage test during high-temperature storage was performed to select a resin. Table 1 shows the liquid leakage rate after 1000 cycles of the thermal shock test. In the thermal shock test, the process of storing at -50 ° C for 1 hour and then storing at 100 ° C for 1 hour was defined as one cycle.

[0030]

[Table 1]

As is clear from Table 1, when the PPS resin is used in the sealing plate structure as in the present invention, the leakage resistance is remarkably improved as compared with the conventionally used PP resin. (Embodiment 2) An advantage of a sealing plate in which the periphery of the rivet insertion hole is concavely recessed will be described. There is an increasing demand for ultra-thin batteries in prismatic batteries. As can be predicted from the drawing shown in FIG. 1, the thinner the thinner, the closer the insulating resin of the sealing plate and the laser welded portion 14 are. Therefore, it is necessary to avoid the influence of heat generated at the time of laser sealing on the insulating resin. In order to solve such a problem, the laser beam is irradiated from the upper part of the sealing plate in FIG. Alternatively, as in the present embodiment, the periphery of the rivet insertion hole of the sealing plate is dented and the insulating resin is molded into the dented portion, thereby preventing the reflection of the laser beam from directly hitting the resin. be able to. As a result, thermal deformation of the insulating resin can be prevented, and a highly reliable battery can be produced. A laser sealing test was performed using a sealing plate in which the periphery of the rivet insertion hole was dented into a concave shape, and a sealing plate using a flat lid plate that was not dented in a concave shape. The test battery and the sealing plate were manufactured as described above. The battery was designed so that the distance between the laser sealing part and the resin was 0.6 mm. The results are shown in (Table 2). (Table 2) shows the presence or absence of resin deformation visually and the liquid leakage rate after storage at 85 ° C. for 3 days. In this embodiment, PP is used as the insulating resin.

[0032]

[Table 2]

As is clear from Table 2, when producing a thinner prismatic battery, it is better to use a sealing plate in which the periphery of the rivet insertion hole is concavely concave as in this embodiment. It is possible to manufacture a highly reliable battery which is less affected by laser irradiation light. (Embodiment 3) The hole shape of the safety valve will be described. Thickness 0.
A 6mm aluminum lid plate is made by cladding aluminum foil (thickness 0.03mm) so that a hole for a safety valve is made and a hole is closed. The valve operating pressure is designed based on the hole shape of the safety valve and the thickness of the aluminum foil. In particular, the hole shape has a great influence on the dispersion of the set valve operating pressure. On the other hand, it is necessary to secure a displacement when releasing internal pressure, and when designing a hole shape in a limited space, considering the productivity etc., triangles and stars are inappropriate and circular, oval, It is limited to squares and rectangles. Accordingly, variations in valve operating pressure were evaluated for these four shapes. The results are shown in Table 3.

[0034]

[Table 3]

As is clear from Table 3, in the case of the battery of the present invention, the shape of the hole for the safety valve is preferably designed to be elliptical. (Example 4) As shown in FIG. 1, the liquid injection path for injecting the electrolytic solution extends from the liquid injection port of the sealing plate toward the inside of the corner of the rectangular case and the space outside the oval electrode group. The advantages of the provision will be described. In the present invention, when the liquid is injected after the sealing plate and the case are laser-welded, the liquid is injected from an injection port provided in the sealing plate. The space inside the battery is very small because the electrode plates are densely packed to increase the discharge capacity. Take it.

In particular, when the liquid is injected from the small injection port of the present invention, it takes a very long injection time because the electrode plate group is located directly below the injection port. FIG. 5 is a schematic view of the prismatic battery as viewed from above the sealing plate. The electrode plate group is obtained by winding a positive electrode plate and a negative electrode plate through a separator and shaping the upper electrode plate into an elliptical electrode plate group, and has a shape shown in FIG.

When the electrode group is inserted into the rectangular case, it can be seen that there is a spatial volume inside the corners of the rectangular case shown in FIG. It is conceivable that injection of the liquid into this portion is relatively easy.

In the present invention, as shown in FIG. 1, the organic electrolyte poured from the inlet is directed toward the space formed by the inside of the corner of the rectangular case and the outside of the elliptical electrode plate group. By providing a groove in the insulating resin of the sealing plate to guide
The efficiency of the injection was improved. A comparison was made between the time for injecting a predetermined amount of the electrolyte solution and the case without such a groove. The results are shown in (Table 4).

[0039]

[Table 4]

As is clear from Table 4, providing the liquid introduction groove can increase the liquid injection speed.

(Embodiment 5) The advantage of providing a mark on the metal foil of the safety valve portion will be described. As described above, in order to prevent the battery from bursting or firing, when the battery internal pressure exceeds a certain pressure, the thin portion is broken, and a safety valve for releasing the pressure is provided. In the present invention, a thin portion is provided by forming a hole for a safety valve in an aluminum lid plate having a thickness of 0.6 mm and cladding a 0.03 mm aluminum foil so as to cover the hole. In a battery, a sufficient hole area cannot be ensured, and there is a problem that the operating pressure of the safety valve becomes too high because the hole area is small. In such a case, it is possible to reduce the working pressure by engraving the thin-walled portion and at the same time to enhance the reliability. Table 5 shows the test results when a horseshoe-shaped engraving was applied to an oval thin portion.

[0042]

[Table 5]

As is clear from Table 5, by providing a mark on the thin portion of the safety valve, it is possible to reduce the operating pressure and at the same time to increase the reliability.

Although the engraving is horseshoe-shaped this time, other shapes may be used.

In this embodiment, an example is shown in which the lid plate and the metal foil constituting the rectangular case and the sealing plate are made of aluminum, and the rivets and washers are made of nickel or nickel-plated iron. Similar results were obtained when the lid plate and the metal foil constituting the plate were made of nickel or nickel-plated iron, and the rivets and washers were made of aluminum.

[0046]

As described above, according to the present invention, the reliability of the safety mechanism of the sealing plate when the internal pressure of the rectangular non-aqueous electrolyte secondary battery rises due to malfunction such as short circuit, overcharge, reverse charge, etc. At the same time, it is possible to provide a sealing plate structure with high productivity and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view of a prismatic nonaqueous electrolyte battery according to the present invention.

FIG. 2 is a view showing a flowchart at the time of manufacturing a sealing plate.

FIG. 3 is a schematic view of a long aluminum hoop material in which a hole for a safety valve is continuously opened and an aluminum foil is clad at a lower portion thereof.

FIG. 4 is a schematic view of an appearance in which a sealing plate is continuously manufactured on a hoop material.

FIG. 5 is a schematic view of a liquid injection part viewed from above a sealing plate of a prismatic battery.

[Explanation of symbols]

Reference Signs List 1 square case made of aluminum 2 sealing plate made of aluminum 2a flat cover plate made of aluminum 2b aluminum foil 3 safety valve 4 hole for safety valve 5 rivet also serving as nickel-plated iron terminal 6 resin insulating gasket 7 nickel plating Iron washer 8 Evacuation hole 9 Injection hole opened in sealing plate cover plate 10 Electrolyte introduction groove 11 Electrode plate group 12 Aluminum current collecting lead taken out from positive electrode plate 13 Nickel taken out from negative electrode plate Current collector lead 14 Laser welded part 15 Pilot hole 16 Space inside the corner of rectangular case and outside of elliptical electrode group

Continued on the front page (72) Inventor Takuya Nakajima 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazunori Haraguchi 1006 Okadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Person Takafumi Fujii 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture (72) Inventor Mamoru Iida Mamoru 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Kenji Mizuno Kadoma City, Osaka Prefecture 1006 Kadoma Matsushita Electric Industrial Co., Ltd.

Claims (20)

[Claims] 1. A square case accommodating an electrode plate group and an electrolytic solution therein, a sealing plate sealing an opening of the square case and having a safety valve, and a rivet serving also as a terminal disposed on the sealing plate. A sealing plate and a rivet are provided with a resin insulating gasket, the sealing plate is constituted by a clad plate obtained by pressing a metal foil on one surface of a flat lid plate, and a safety valve of the sealing plate is for a safety valve provided on the lid plate. A rectangular nonaqueous electrolyte battery, wherein the rectangular case and the sealing plate are formed by covering only the lower part of the hole with a metal foil or covering the entire lower surface of the lid plate. 2. The rectangular non-aqueous electrolyte battery according to claim 1, wherein the insulating gasket is a polyphenylene sulfide resin. 3. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the sealing plate is provided with a liquid inlet. 4. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the periphery of the rivet insertion hole at the center of the sealing plate is concavely concave. 5. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the hole for the safety valve is elliptical. 6. The rectangular nonaqueous electrolyte battery according to claim 1, wherein a metal washer for electrically connecting the rivet and a lead plate having the same polarity as the rivet is disposed below the rivet. 7. A battery in which an elliptical electrode group is accommodated in a rectangular case, wherein a liquid injection passage for injecting an electrolyte is provided from a liquid injection port provided at one place of a sealing plate to a corner of the rectangular case. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the battery is provided toward a space formed by the inside of the portion and the outside of the elliptical electrode plate group. 8. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the lid plate and the metal foil constituting the rectangular case and the sealing plate are made of aluminum, and the rivets and washers are made of nickel or nickel-plated iron. 9. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the lid plate and the metal foil constituting the rectangular case and the sealing plate are made of nickel or nickel-plated iron, and the rivets and washers are made of aluminum. 10. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the clad plate in which the metal foil is pressure-bonded so as to cover the hole for the safety valve is stamped in the hole for the safety valve in the metal foil. 11. A method for manufacturing a sealing plate for a rectangular non-aqueous electrolyte battery, wherein a step of continuously providing a safety valve hole in a part of a long thin plate-like hoop material is provided. A step of crimping a band-shaped metal foil, a step of continuously providing a hole for inserting a metal rivet in the center of the hoop material, a step of molding an insulating resin in the hoop material, and a step of providing the center portion of the hoop material. Inserting the rivet into the hole and caulking;
Transferring the hoop material to a battery assembling step, and cutting the hoop material into each sealing plate. A method for producing a sealing plate for a rectangular nonaqueous electrolyte battery. 12. The method for producing a sealing plate for a non-aqueous electrolyte battery according to claim 11, wherein the resin is a polyphenylene sulfide resin. 13. The rectangular non-square non-woven fabric according to claim 11, further comprising a step of continuously providing a liquid inlet between the step of continuously providing a rivet insertion hole and the step of molding an insulating resin in the hoop material. Manufacturing method of sealing plate for water electrolyte battery. 14. A method for manufacturing a sealing plate for a rectangular nonaqueous electrolyte battery according to claim 11, wherein the periphery of the rivet insertion hole provided in the center is concavely recessed. 15. The method for manufacturing a rectangular battery sealing plate according to claim 11, wherein the band-shaped metal foil is pressure-bonded so as to cover only a lower portion of the safety valve hole or to cover the entire lower surface of the sealing plate. 16. The safety valve hole according to claim 11, wherein the hole is oval.
A method for producing a sealing plate for a rectangular nonaqueous electrolyte battery according to the above. 17. A nickel or nickel-plated metal washer is inserted between a step of molding an insulating resin into a hoop material and a step of inserting the rivet into a hole provided in the center and caulking. The method for producing a sealing plate for a rectangular nonaqueous electrolyte battery according to claim 11, further comprising a step. 18. The plug for a square nonaqueous electrolyte battery according to claim 11, wherein the lid plate and the metal foil constituting the rectangular case and the sealing plate are made of aluminum, and the rivets and washers are made of nickel or nickel-plated iron. The method of manufacturing the board. 19. The plug for a square nonaqueous electrolyte battery according to claim 11, wherein the lid plate and the metal foil constituting the rectangular case and the sealing plate are made of nickel or nickel-plated iron, and the rivets and washers are made of aluminum. The method of manufacturing the board. 20. The method for manufacturing a sealing plate for a rectangular nonaqueous electrolyte battery according to claim 11, further comprising a step of continuously engraving a mark on the metal foil in the safety valve hole.