JP3040787U - Assembled reel for lithium tape - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve accuracy and workability while maintaining a single weight of a lithium metal or a lithium alloy per reel. To provide reels for tape. An assembly type is adopted as a cylindrical portion c around which a square thick tape of lithium metal or lithium alloy is wound.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a reel for a lithium tape used for manufacturing a product for a negative electrode of a lithium battery. More specifically, it is easy to wind a thick tape made of lithium metal or a lithium alloy and having a square cross section. The present invention also relates to a lithium tape prefabricated reel that can prevent damage, winding misalignment, winding disorder, winding sag, etc. during transportation of a wound tape.

[0002]

[Prior art]

 Conventionally, the lithium metal or lithium alloy used to manufacture products for negative electrodes of lithium batteries is used in coin-type batteries, and the lithium metal or lithium alloy ingot is formed into a tape by a molding machine such as an extruder. The tape 1 was formed and wound on a reel 2 by a winding machine as shown in FIG. Then, in the battery manufacturer, as shown in FIG. 1 (b), the tape 1 was rewound from the reel 2 and the tape 1 was punched out into a coin shape to be used as a negative electrode for a lithium battery.

However, in this method, the lithium metal or the lithium alloy after punching causes a loss, and the processing cost for this loss is incurred, resulting in poor economic efficiency.

Therefore, in consideration of economic efficiency, as shown in FIGS. 2A and 2B, the thick metal tape 3 of lithium metal or lithium alloy extruded in a rectangular cross section is wound around the reel 2. After that, as shown in FIG. 2 (b), a necessary amount of the thick tape 3 unwound from the reel 2 is cut by a cutter 4 and crushed by a crushing jig 5 to obtain a coin type product. A method of molding is practiced.

Usually, when lithium metal or a lithium alloy is pressed and molded, the same volume as that of a conventional punched lithium metal or a lithium alloy is required and a clean circular shape is obtained after the pressing. For the reason that it is required, it is required to use a thick tape having a rectangular cross section, which is narrower in width and larger in thickness than the conventional lithium metal or lithium alloy tape for punching, as described above.

However, as shown in FIG. 2 (a), the thick tape 3 of lithium metal or lithium alloy having a square cross section is replaced with a conventional lithium metal or lithium alloy tape for punching. When wound on the reel 2 in use, the width is narrow and the thickness is large, so the unit weight of lithium metal or lithium alloy per reel (weight of lithium metal or lithium alloy per reel) becomes small. There is a problem.

In order to solve the above problem, as shown in FIG. 3 (a), the crushing lithium metal or lithium alloy tape is wound on a traverse winding (JP-A-7-246420), As shown in FIG. 4, it has been proposed to wind several reels on one reel in multiple rows (Japanese Patent Laid-Open No. 7-282804).

However, when a thick square metal tape of lithium metal or a lithium alloy is wound by traverse winding, the tape is twisted to reduce the accuracy of thickness and width, and the volume of the lithium metal or lithium alloy after cutting varies. May occur. If several reels are wound on one reel in multi-rows, the wound tape may be disturbed during winding, and the wound tape may come into contact with the wound tape, making it impossible to wind. There is a work problem.

[0009]

[Problems to be solved by the device]

 The present invention solves these problems of the prior art, and can improve accuracy and workability while maintaining the unit weight of lithium metal or lithium alloy per reel. The purpose is to provide a reel for thick tape with a square cross section.

[0010]

Means for Solving the Problems As a result of various studies by the present inventor, by adopting an assembling type cylindrical portion around which a square thick wall tape of lithium metal or lithium alloy is wound, I came to solve the problem.

That is, the reel for lithium tape of the present invention is wound with a thick tape made of lithium metal or a lithium alloy and having a square cross section (hereinafter, abbreviated as “square thick tape” in some cases). A reel for a lithium tape comprising a cylindrical portion and a disk-shaped member that is detachably fixed to both ends of the cylindrical portion, wherein the cylindrical portion is an assembly type.

[0012]

[Embodiment of the invention]

 Hereinafter, the present invention will be described with reference to the drawings. FIG. 6 is a sectional view showing the basic structure of the reel for lithium tape of the present invention. As shown in the figure, the cylindrical portion c of the reel for lithium tape of the present invention is an assembling type, and a plurality of components c0, c1, ... It is preferably composed of Further, as shown in FIGS. 6 and 7 (1) and (2), the component is formed of two cylinders having the same central axis but different diameters, and the prefabricated cylindrical portion c has a diameter of the component. It is desirable that the small cylinders are inserted into the large diameter cylinder of another part one by one and assembled.

The two disk-shaped members a and b need to be detachably fixed to both ends of the assembly-type cylindrical portion c, and therefore fixing means such as screwing is preferable.

The thick metal tape having a square cross section of lithium metal or lithium alloy used here can be obtained by extruding an ingot with a molding machine such as an extruder. The thickness and width of the thick square tape are not particularly limited, but the width is preferably such that it can be wound onto the outside of each component that constitutes the prefabricated cylindrical portion. At the same time, when the tape is cut and crushed to obtain a product, it is necessary that the quantity and the shape are within a range that is satisfactory as the negative electrode of the coin-type lithium battery.

Further, a lithium aluminum alloy is preferably used as the lithium alloy, and the aluminum concentration thereof is preferably 900 ppm or more, more preferably 900 to 1200 ppm.

[0016]

【Example】

Hereinafter, the present invention will be described based on examples and the like. Embodiment 1 FIG. 6 is a sectional view showing the basic structure of a reel for a lithium tape according to the present invention, in which a cylindrical portion c is an assembly type. On the other hand, FIG. 5 is a cross-sectional view showing the structure of a conventional general lithium tape reel.

When a thick tape made of lithium metal or a lithium alloy and having a square cross-section is wound around the reel 2 of the present invention shown in FIG. 6, as shown in FIGS. The part c is disassembled into parts c0, c1, ..., Cx, and the thick square tape 3 is wound around the outside of the part c1 as shown in FIG. 7, for example. Similarly, the thick rectangular tape 3 is also wound on the outer sides of c0, c2, ..., Cx (FIG. 8 (1)) and each is combined (FIG. 8 (2)).

As shown in FIG. 8 (3), a method of fixing the assembly type cylindrical portion c of FIG. 8 (2) and a method of fixing the cylindrical portion c to the disk-shaped members a and b are as follows. A method in which a and b sandwiching the above are fastened with a screw d to fix the whole is conceivable. Here, the disk-shaped members a and b have a diameter of 45 cm, the prefabricated cylindrical part c has an outer diameter of 7 cm, an inner diameter of 6 cm, a height of 5 cm, and the square thick tape 3 has a thickness of 4 mm and a width of 4 mm. It was

When the square thick tape 3 is rewound from the prefabricated reel 2 and used, the screw d is loosened and removed, the cylindrical portion c is disassembled, and each reel is rewound one by one for use.

Generally, when transporting a reel for a lithium tape for use, the thick square tape wound up due to vibration or the like causes winding misalignment or dripping, which makes it difficult to use during use (rewinding). Or it may become unusable. For example, in the case of a conventional non-assembled reel in which a square thick tape is wound in multiple rows as shown in FIG. 4, a cushion material f'as shown in FIG. 9 (1) is used. By inserting as in (2), the vibration of the square thick tape 3 is suppressed, and the above inconvenience is prevented. On the other hand, in the case of the reel of the present invention, when the cushioning material f having the shape shown in FIG. 10 (1) is fitted as shown in FIGS. 10 (2) to 10 (3), the square thick tape 3 vibrates. Is suppressed and prevented. Embodiment 2 As a method of fixing the prefabricated cylindrical part c and the disk-shaped members a and b, as shown in FIG. 11, the joints of the respective parts c0, c1, ..., Cx and the disk-shaped members a and b are There is also a method of cutting each screw at the joint and fixing each. In this case, as shown in FIG. 11, a hole having a desired diameter can be provided at the center of the disk-shaped members a and b.

At the time of winding the thick square tape, there is a method of winding the preassembled cylindrical portion c in a disassembled state as in Example 1, and then assembling it. As another method, the preassembled cylindrical portion c is used. It is also possible to wind without disassembling.

At this time, at the time of use, two kinds of methods can be selected at the time of use: a method of disassembling the assembling type cylindrical portion c as in Embodiment 1 and a method of using the assembling type without disassembling as in the conventional method. There is an advantage that you can. Further, when the disc-shaped members a and b are used as they are assembled, there is an advantage that the diameters of the rewinding shafts can be changed by replacing the disc-shaped members a and b with those having different center holes.

[0023]

[Effect of the invention]

 As described above, in the reel for lithium tape of the present invention, the preassembled cylindrical portion is disassembled, and each disassembled part is wound with thick tape having a square cross section made of lithium metal or lithium alloy, and then By combining the parts in which these tapes are wound, the wound tape will be disturbed during winding, as in the past, and the wound tape will be touched, scratched, or unwound. Disappears.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a state in which a conventional lithium metal or lithium alloy tape is wound on a reel, and FIG. 1B is a view showing a step of manufacturing a negative electrode product of a lithium battery using the tape.

FIG. 2 is a perspective view (a) showing a conventional thick metal tape having a rectangular cross section of lithium metal or a lithium alloy wound on a reel, and a process of manufacturing a negative electrode product for a lithium battery using the tape. The figure shown (b).

FIG. 3 is a cross-sectional view (a) showing a conventional thick tape having a rectangular cross section of lithium metal or a lithium alloy wound on a reel in a traverse winding, and a negative electrode product of a lithium battery is manufactured using the tape. The perspective view (b) which shows the process to do.

FIG. 4 is a cross-sectional view (a) showing a conventional thick metal tape having a rectangular cross section of lithium metal or a lithium alloy wound in multiple rows on one reel and a lithium battery using the tape. The perspective view (b) which shows the process of manufacturing the product for negative electrodes.

FIG. 5 is a sectional view showing the configuration of a conventional general reel.

FIG. 6 is a sectional view showing the structure of a basic reel of the present invention.

FIG. 7 is a perspective view showing one component of the assembling cylindrical portion according to the present invention and a cross-sectional view showing how to wind a thick tape having a rectangular section of lithium metal or lithium alloy on the component.

FIG. 8 is a cross-sectional view showing a method of assembling the reeled parts of the thick tape having a square section of lithium metal or lithium alloy according to the present invention.

FIG. 9 is a view showing a conventional cushioning material applicable to the reel having the conventional structure shown in FIG. 4 and a method of inserting the cushioning material into the reel.

FIG. 10 is a view showing a cushion material applicable to the reel of the present invention and a method of applying the cushion material to the reel.

FIG. 11 is a cross-sectional view showing how to assemble the reel of the present invention.

[Explanation of symbols]

1: Lithium metal or lithium alloy tape, 2: Reel, 3: Thick tape with a rectangular cross section of lithium metal or lithium alloy, 4: Cutter, 5: Crushing jig, a,
b: disk-shaped member, c ': cylindrical portion, c: prefabricated cylindrical portion, c
0, c1, c2, ..., Cx: Each part of the assembly type cylindrical portion, d: screw, e: nut, f, f ': cushion material.

Claims (3)

[Utility model registration claims] 1. A lithium tape comprising a cylindrical portion around which a thick tape made of lithium metal or a lithium alloy and having an angular cross section is wound, and disk-shaped members detachably fixed to both ends of the cylindrical portion. A reel for a lithium tape, wherein the cylindrical portion is an assembly type. 2. The reel according to claim 1, wherein the prefabricated cylindrical part is composed of a plurality of parts that are disassembled in a plane parallel to a surface of an end thereof. 3. The component is formed of two cylinders having the same central axis and different diameters, and the prefabricated cylindrical portion comprises:
3. The reel according to claim 2, wherein a cylinder having a small diameter of the component is sequentially inserted into a cylinder having a large diameter of another component to be assembled.