KR20130118715A - Method for manufacturing the battery case - Google Patents

Abstract

PURPOSE: A method for manufacturing a battery case is provided to obtain a battery case having a uniform thickness and form an interlocking space in which a cover is interlocked with an inner circumference periphery of the battery case without a separate process. CONSTITUTION: A method for manufacturing a battery case comprises a pressing process and a finishing process. In the pressing process, an original case is manufactured by filling a cavity of a die with a slag and then dropping a punch into the cavity to percussively pressurize the slag. In the finishing process, a punch (24) is used. The punch includes a dice (22) having a dice hole (23), an inserting part (25), and a large diameter part (26) having an outer diameter equal to an inner diameter of an interlocking space of the battery case. The original case is passed through the dice hole while the inserting part is inserted into the original case, so that the interlocking space is formed while the sidewall of the original case has a uniform thickness.

Description

Manufacturing method of battery case {METHOD FOR MANUFACTURING THE BATTERY CASE}

The present invention relates to a method for producing a battery case of a new type battery mainly used in a hybrid car or an electric vehicle. More specifically, in the production of a battery case manufactured by an impact press, the thickness is uniformly finished and It is related with the manufacturing method of the battery case characterized by the manufacture being possible at a process.

In recent years, so-called new batteries such as lithium ion batteries, sodium batteries, and nickel-metal hydride batteries have been employed as batteries used in hybrid cars and electric vehicles. Generally, battery cases constituting these new batteries have an opening at an upper portion thereof. It is a box-shaped or cylindrical bottomed structure, and is manufactured by the method of impact press.

Here, a method of manufacturing a battery case by the method of the impact press will be described with reference to the drawings. FIG. 12 is a view for explaining a method of manufacturing the battery case by the method of the impact press. It is sectional drawing which shows the state in which a battery case is manufactured by an impact press.

In FIG. 12, when the battery case is manufactured by the impact press method, the die 41 in which the cavity 42 is formed and the slag 43 loaded in the cavity 42 in the die 41 are provided. ) And the punch 44 which inserts the tip part into the cavity 42 by lowering the die 41.

Then, first, the slag 43, which is a metal mass such as an aluminum material, which is a raw material of the battery case, is filled in the cavity 42.

Then, in that state, the punch 44 is lowered and the tip portion of the punch 44 is inserted into the cavity 42 to pressurize the slag 43 by impact.

Therefore, as shown in FIG. 13, the slag 43 in the cavity 42 deforms upward in a plastic manner so as to conform to the outer circumference of the punch 44, whereby the battery case 45 Is prepared.

Therefore, when a battery case is manufactured by the method of this impact press, compared with the case of manufacturing by a deep drawing press etc., for example, there exists an advantage that mold is few and material loss is small.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-176588 Patent Document 2: Japanese Patent Application Laid-Open No. 2000-197913 Patent Document 3: Japanese Patent Application Laid-Open No. 2011-222283

However, it has been pointed out that the battery case manufactured by the method of the above-mentioned impact press cannot make the thickness of the side wall uniform.

That is, when the battery case is manufactured by the above-described impact press method, the slag plastically deforms upward along the punch outer circumference due to the impact of the punch. At this time, the thickness becomes thicker as the tape goes upward. A problem arises that the thickness of the upper part becomes thicker than the lower part of the battery case.

In addition, in the manufacture of a new battery, it is necessary to attach a cover to the upper part of the battery case so as to close the upper opening of the battery case after the battery component is charged in the battery case. There is an upward welding method.

Here, if this upward welding method is described, in this method, a step is formed in the inner circumference of the upper part of the battery case by increasing the inner diameter and making the thickness of the side wall thinner with respect to the upper part of the battery case. A fitting space for fitting the lid is formed in the upper inner circumference.

On the other hand, the outer diameter of the lid is made the same as the portion where the thickness is thin, that is, the inner diameter of the fitting space, and the height dimension of the fitting space in the battery case is the same as the thickness dimension of the lid.

Thus, by placing the periphery of the lid on the stepped portion, the lid is fitted to the fitting space so as to prevent the over-overflow of the battery case, and thereafter, the contact portion between the outer periphery of the lid and the upper inner circumference of the battery case main body, It welds from an upper axis by a laser beam, and joins a cover to a battery case by this.

Therefore, in adopting this method, it is necessary to form a fitting space by forming a step portion at the inner circumference of the upper end of the battery case before joining the cover to the battery case. Thus, the battery case is manufactured by the impact press. Thereafter, there is also a problem that a step of forming a stepped portion is required, whereby the manufacturing cost increases.

Therefore, in the method of manufacturing a battery case by an impact press, the present invention makes it possible to obtain a battery case with a uniform thickness, and fits the lid to the upper inner circumference of the battery case without going through a separate step. It is an object of the present invention to provide a method for manufacturing a battery case that enables the fitting space to be formed and prevents an increase in manufacturing cost.

The method for manufacturing a battery case of the present invention according to claim 1 has a bottomed battery case having an upper portion as an opening while having a fitting space in which the lid is fitted by forming a stepped portion where the periphery of the lid is placed, on the inner circumference of the upper end, As a manufacturing method of the battery case manufactured by the method of an impact press,

A press process for producing a case prototype by impact press,

And a finishing step of uniformly finishing the thickness of the case prototype produced in the pressing step with a die,

The said press process uses the die which has a cavity, and the punch for press which is arrange | positioned so that relative movement with respect to the die is possible, and allows the tip part to be inserted in the said cavity by descending,

A slag as a case material is filled in the additive cavity, the punch for the press is lowered, a tip portion of the press punch is inserted in the cavity, the slag is shocked to press, and the slag is plastically deformed to produce a case prototype. and,

The finishing step includes a die having a die hole having the same inner diameter as the outer diameter of the battery case to be manufactured, an insertion portion having an outer diameter substantially the same as the inner diameter of the battery case to be manufactured, and an upper end of the insert portion. By using a punch for dice having a large diameter portion having an outer diameter approximately equal to the inner diameter of the fitting space in the battery case,

By passing the case circle through the die hole in the state in which the insertion portion is inserted into the case circle, thereby producing a battery case in which the thickness of the side wall of the case circle is uniform and a fitting space is formed in the inner circumference of the upper end of the case circle. Doing.

Moreover, the manufacturing method of the battery case of this invention of Claim 2 is formed in the bottom part of the cavity in the die | dye used at the said press process, the recessed part of internal diameter substantially the same as the outer diameter of the battery case to manufacture is formed, It is characterized by the above-mentioned. Doing.

In the manufacturing method of the battery case of this invention, a large diameter part is used for the die | dye punch used when passing the case circular side wall manufactured by an impact press with a dice, and making it uniform thickness, and passing it through a die. By forming, it is possible to form the fitting space which fits a cover in the inner periphery of the upper end part of a case circle when the side wall of a case circle | round | yen is made into uniform thickness.

Therefore, according to this invention of Claim 1, in the method of manufacturing a battery case by an impact press, while being able to make thickness uniform, the fitting space is formed in the upper periphery of the upper end of a battery case without going through a separate process. It is possible to form, and it is possible to suppress the rise of manufacturing cost.

Moreover, in the manufacturing method of the battery case of this invention of Claim 2, in the bottom part of the cavity in the die used in a press offensive, the recessed part of the internal diameter substantially the same as the outer case of the battery case to manufacture is formed, and thereby, When the case circle is passed through the die hole, the lower part of the lower part which is made the same as the outer diameter of the battery case for producing the outer diameter of the lower part of the case circle manufactured by the pressing process and is equal to the outer diameter of the battery case to be manufactured in the case circle. Since the upper portion is allowed to pass through the die hole, the thickness of the side wall of the battery case can be made more uniform.

That is, when the groove of the inner diameter substantially the same as the outer diameter of the battery case manufactured in the bottom part of the cavity in the die used at the press process is not formed, the outer diameter of the lower part of the case circle | round | yen through the press process is a battery to manufacture. Since it is larger than the outer diameter of the case, when the case circle passes through the die hole, the case diameter is reduced by the die hole from the periphery of the bottom surface of the case circle. Deterioration may occur, and in this case, the thickness of the side wall of the battery case cannot be made uniform.

However, in the present invention as set forth in claim 2, in the bottom portion of the cavity in the die used in the furless process, by forming a recess having an inner diameter approximately equal to the outer diameter of the battery case to be manufactured, The upper part of the lower part which is made the same as the outer diameter of the battery case which manufactures the outer diameter of a lower part, and is made to pass through the die | dye hole, and according to this, it is dug in the inner peripheral side near the lower end part of a case circle. This did not occur, and it was confirmed that the thickness of the side wall of the battery case can be made more uniform.

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the battery case manufactured by the Example of the manufacturing method of the battery case of this invention.
2 is a view for explaining a pressing step in the embodiment of the battery case manufacturing method of the present invention.
3 is a view showing a case prototype manufactured in a pressing step in an embodiment of a method for manufacturing a battery case of the present invention.
4 is a view for explaining a die to be used in the finishing step in the embodiment of the battery case manufacturing method of the present invention.
5 is a view for explaining a finishing step in the embodiment of the method for manufacturing a battery case of the present invention.
FIG. 6 is a view for explaining another configuration of the press apparatus used in the pressing step in the embodiment of the battery case manufacturing method of the present invention. FIG.
FIG. 7 is a view showing a state in which case prototypes are manufactured by the press apparatus shown in FIG. 6. FIG.
8 is a view showing a case prototype manufactured by the press device shown in FIG.
9 is a view for explaining the effect of the press device shown in FIG.
FIG. 10 is a view for explaining the effect of the press apparatus shown in FIG. 6; FIG.
FIG. 11 is a view for explaining the effect of the press apparatus shown in FIG. 6; FIG.
12 is a view for explaining a general impact press method.
13 is a view for explaining a general impact press method.

According to the method of manufacturing a battery case of the present invention, a stepped portion in which the periphery of the cover is placed is provided with a fitting space in which the cover is fitted on the inner circumference of the upper end, and a battery case with a bottom having an upper opening as an opening. It is set as the manufacturing method of the battery case manufactured by the method, Comprising: The press process which manufactures a case prototype by an impact press, and the finishing process which uniformly finishes the thickness of the side wall of the case prototype manufactured by the press process by dice. Doing.

In the pressing step, a die having a cavity filled with the material of the battery case and a punch for press which is disposed so as to be relatively movable with respect to the die and which is lowered by inserting and densifying the tip portion in the cavity, In the cavity, slag as a material of the battery case is filled.

Next, the press punch is lowered, the tip portion of the press punch is inserted into the cavity, the slag in the cavity is shocked and the slag is plastically deformed in accordance with the outer periphery of the punch for press. Manufacture. [0029]

Next, in the finishing step, a die having a die hole and a die punch are used to insert the die punch into the case circle, and the case circle is pressed to the die hole side by moving the die punch to the die hole side. The case circle is passed through the die hole, whereby the outer diameter of the die circle is reduced.

The die hole has the same inner diameter as the outer diameter of the battery case to be manufactured, and the die punch includes an insertion portion having an outer diameter substantially the same as the inner diameter of the case body to be manufactured, and a large diameter portion that is extended to the upper end of the insertion portion. The large diameter portion has an outer diameter substantially the same as the inner diameter of the stepped portion in the battery case to be manufactured, whereby the die punch is moved to the die hole side while the insertion portion is inserted into the case circle, and the case circle passes through the die hole. By making the thickness of the side wall of a case circular shape uniform, the step space part is formed in the inner periphery of the upper end part of a case circular shape, and the fitting space which fits a lid can be formed.

Here, the bottom portion of the cavity in the die used in the pressing step may be provided with a recess having an inner diameter substantially the same as the outer diameter of the battery case to be manufactured, whereby when passing the case circle through the die hole, It is possible to prevent the occurrence of dents and to make the thickness of the side wall of the case circular uniform.

Example 1

When explaining the Example of the manufacturing method of the battery case of this invention, the manufacturing method of the battery case of this Example is set as the method of manufacturing the battery case which joins a cover by an upward welding system.

That is, FIG. 1 is a figure for demonstrating the battery case manufactured by the manufacturing method of the battery case of a present Example, and 1 is a battery case in a figure.

And the battery case 1 manufactured by the manufacturing method of the battery case of this Example is made into the thin box shape with the bottom which made the upper part the opening 2, as shown in FIG.

In addition, the upper end part forms the step part 3 on the inner circumferential side by thinning the thickness by a predetermined length in the state of maintaining the outer diameter, that is, increasing the inner diameter, whereby the upper part of the battery case 1 The upper part of the step part 3 in an inner periphery is used as the fitting space 4, and the opening 2 of the upper part of the battery case 1 is fitted by fitting the lid | cover 8 to this fitting space 4. It is supposed to be closed by the cover 8.

That is, when manufacturing a new battery using the battery case 1 manufactured by the manufacturing method of the battery case of a present Example, after charging a battery component in the battery case 1, By placing the periphery of the lid 8 on the stepped portion 3 so that the upper opening 2 is closed, the lid 8 is fitted into the fitting space 4 so that the top opening of the battery case 1 ( 2) is covered with the lid 8, and thereafter, the contact portion of the outer circumference of the lid 8 and the upper inner circumference of the upper case of the battery case 1 is welded from above with a laser beam to cover the lid 8 with the battery case 1 Is performed by

Therefore, in manufacturing the plain case 1, the height dimension of the fitting space 4 is the same as the thickness dimension of the lid 8, and the inner diameter dimension of the fitting space 4 is the lid 8. It should be the same as the outer diameter of.

Next, the manufacturing method of the battery case of the present embodiment will be described. The manufacturing method of the battery case of the present embodiment includes a press step for producing a case prototype by impact press and a thickness of the case prototype manufactured in this press step. It finishes uniformly with a dice, and the finishing process of forming a fitting space in the inner peripheral side of the upper end part of a case circular shape is provided.

First, the press process will be described. In the press process according to the present embodiment, the die as a mold and the punch for pressing are performed as in the case of a general impact press.

That is, in Fig. 2, 11 is a press device for performing an impact press, and in the drawing, 12 is a die, and in this die 12, a cavity 13 having a shape dimension corresponding to the outer diameter of the battery case to be manufactured is formed. It is.

In addition, in the figure, 14 is slag as a material of the electronic case 1, and it is set as the ingot of metals, such as aluminum, and this slag 14 is filled in the said cavity 13.

In the drawing, reference numeral 15 denotes a punch for pressing, and the punch 15 for pressing has an outer diameter that is substantially the same as the inner diameter of the battery case 1 to be manufactured so that the tip portion can be inserted into the cavity 13. have.

In the pressing step of the present embodiment, the slag 14 as a case material is filled in the cavity 13, and the punch 15 is lowered in the state so that the punch 15 is in the cavity 13. By inserting the tip portion of the slag 14, the slag 14 is pressurized.

Thus, similarly to FIG. 13 described above, the slag 14 in the cavity 13 is plastically deformed upward along the outer periphery of the punch 15, thereby forming a circular shape of the battery case 1. A prototype is made.

That is, Fig. 3 is a case circle 5 manufactured in the pressing step, and on the sidewall of the case circle 5, the inner diameter is almost the same as the inner diameter of the battery case 1 to be manufactured, but the outer diameter is upward. Therefore, the taper shape widens outward, and the thickness of the side wall is nonuniform.

Therefore, in the manufacturing method of the battery case of this embodiment, after the case circle 5 is manufactured in the pressing step, in the finishing step, the case circle 5 is passed through a die to make the thickness of the sidewall uniform. I do it.

Here, the dies used in the finishing step will be described. FIG. 4 is a cross-sectional view for explaining the dice used in the present embodiment, and the portion shown in FIG. 21 is the die used in the present embodiment. The part 1 shown by the dotted line is the battery case 1 manufactured via the finishing process.

The die 21 used in the present embodiment has a die main body 22, and the die main body 22 passes through the case main body 5 to reduce the outer diameter of the case main body 5. The die hole 23 is formed, and the inner diameter of this die hole 23 is made the same as the outer diameter of the battery case to manufacture.

Moreover, in the dice | dies 21 in this embodiment, it has a die | dye punch inserted in the said die | dye hole 23. As shown in FIG. That is, in the drawing, 24 is a die punch, and the die punch 24 in the present embodiment includes an inserting portion 25, and the inserting portion 25 performs the case when executing the finishing step. It is supposed to be inserted in the circle (5).

And the said insertion part 25 is made into the outer diameter same as the inner periphery of the said case circular shape 5, Therefore, the outer diameter of the insertion part 25 at the time of inserting the insertion part 25 in the die hole 23, and The clearance with the inner diameter of the said die | dye hole 23 is set to the thickness of the side wall of the battery case 1 to manufacture.

Therefore, in the state which inserted the said insertion part 25 in the case circular shape 5, the case circular shape 5 is pressurized downward by lowering the die | punch 24 for dice | dies, and thereby the case circular shape 5 is diced. When passed through the hole 23, the side wall of the case circle 5 is scraped off by the inner wall of the die hole 23 and the insertion portion 25, and is molded to the thickness of the battery case to be manufactured. In this embodiment, the battery case 1 has a thickness of 0.8 mm.

Next, in the drawing, 26 is the large diameter part. That is, in the present embodiment, the die punch 24 extends the large diameter portion above the insertion portion 25, and the large diameter portion 26 is a fitting space in the battery case 1 to be manufactured ( The outer diameter is almost the same as the inner diameter of 4). Therefore, the fitting space 4 of the battery case 1 manufactured by the clearance of the outer image of the large diameter part 26 and the internal diameter of the said die hole 23 when the large diameter part 26 is inserted in the die hole 23 is produced. ) Side wall thickness.

Therefore, in the state which inserted the said insertion part 25 in the case circular shape 5, the die punch 24 is lowered and it continues descending, and the part of the large diameter part 26 is a die hole 23 When the inside is inserted, the thickness of the side wall at the upper end part of the case circle 5 is scraped off by the inner wall of the die hole 23 and the large diameter part 26, and is a part of the fitting space 4 of the battery case to manufacture. It is molded to the thickness of the side wall of the.

Therefore, according to this embodiment, only the case circular shape 5 is passed through the die hole 23 in the die 21 using the die punch 24, and the thickness of the case circular shape 5 is made uniform. In addition, since the fitting space 4 for fitting the lid can be formed, it is possible to reduce the manufacturing cost by eliminating the need to pass through a separate step to form the stepped portion.

Next, with reference to FIG. 5, the process of performing a finishing process using the dice | dies 21 comprised in this way is shown, FIG. 5 shows the case prototype (by passing the case circular shape 5 through the die hole 23). It is a figure for demonstrating the process of forming the fitting space 4 in the inner periphery of the upper part of the case circle | round | yen 5 with the thickness of the side wall of 5) uniform, and FIG. 5 (a), case circle | round | yen 5 The insertion part 25 of the die punch 24 is inserted in the inside.

In FIG. 5B, by moving the die punch 24 to the die hole 23 side, the die punch 24 is pressed downward by the die punch 24, whereby the case The circular shape 5 is passed through the die hole 23.

Then, as the case circle 5 passes through the die hole 23 and the lower portion of the case circle moves downward, the side wall of the case circle 5 is formed by the die hole 23 and the insertion portion 25. ), The thickness is processed to the thickness of the battery case 1 to be manufactured, and the upper end portion of the case circle 5 extends upward along the outer periphery of the insertion portion 25 with the feeling.

Then, by continuing to move downward of the die press 24, as shown in FIG. 5C, the upper end of the case circle 5 is lowered to the lower end of the large diameter portion 26 in the die press 24. After reaching, further movement downward of the die press is carried out, and as described above, the side wall of the case circle 5 is scraped and processed to a desired dimension, and the upper end of the case circle 5 is sensed. As shown in FIG.5 (d), a part extends upward along the outer periphery of the large diameter part 26. As shown in FIG. [0059]

And further, when the downward movement of the die | dye press 24 continues, and the large diameter part 26 reaches the die hole 23 and passes further through the die hole 23, it will show in B5 (e). Similarly, the lj wall of the case circle 5 which has been extended around the large diameter portion 26 is scraped off by the inner wall of the die hole 23 and the large diameter portion 26, and the thickness thereof fits the battery case to be manufactured. It is machined to the thickness of the side walls of the part of the space 4.

Therefore, after passing the case circular shape 5 all through the die | dye hole 23, the die punch is removed from the case circular shape 5, and the fitting space 4 in which the upper part of the case circular shape 5 was formed By cutting so as to have the same dimensions as the thickness of the fitting to be fitted, it is possible to obtain a battery case having a uniform thickness as shown in FIG.

Thus, according to the manufacturing method of the battery case of this embodiment, in the method of manufacturing a battery case by an impact press, while being able to make thickness uniform, it does not pass through a separate process, and the upper inner periphery of a battery case. It is possible to form a stepped portion in the cross section, to obtain a fitting space, and to suppress an increase in manufacturing cost.

6 is a figure for demonstrating the other structure of the press apparatus used for the press process in this invention, and FIG. 7 is the state which manufactures the case prototype 5 in the press apparatus shown in FIG. 8 is a diagram showing a case prototype 5 manufactured by the press apparatus shown in FIG.

And in the press apparatus 31 shown in FIG. 6, similarly to the press apparatus 11 mentioned above, the die 32, the cavity 33 formed in this die 32, and the punch 36 for a press are In addition, at the bottom of the cavity 33, a recess 34 having an inner diameter substantially equal to the outer diameter of the battery case 1 to be manufactured is formed, and the slag 35 is formed in the recess 34. I charge it.

Further, by pressing the punch 36 for the press 36, the pressing portion 37 is inserted into the recess 34 to press the slag 35 in an impact manner. In this way, the thickness of the side wall of the case circle can be made uniform in the finishing step.

That is, when the case circle | round | yen 5 manufactured by the conventional press apparatus shown in FIG. 2 passes through the die hole 23 in a finishing process, it is enclosed by the side wall of the vicinity of the lower end of the case circle | round | yen 5 (6). This may be formed, and in such a case, the thickness of the side wall cannot be made uniform.

This will be described in detail. FIG. 10 is an enlarged view of FIG. 5A, and as shown in FIG. 10, a die hole 23 in the finishing process of the case prototype 5 manufactured by the conventional press apparatus shown in FIG. 2. ), The case circular (5) is pressed downward by the die press 26 and starts to be inserted into the die hole 23, the case circular (5) by the inner wall of the die hole 23 Since the periphery of the lower end of 5) is pushed upward, as shown in FIG. 11, the recess 6 may be formed in the side wall near the lower end of the case circle 5, and in such a case, The thickness of the side wall cannot be made uniform.

On the other hand, according to the experiment of the present inventors, when the recessed part 34 of the inner diameter substantially the same as the outer diameter of the battery case 1 manufactured is formed in the bottom of the said cavity 33, it is shown in FIG. As described above, since the convex portion 7, which is the same as the outer diameter of the battery case 1, is formed at the lower end portion of the case circle 5, the case circle 5 is passed through the die hole 23. As shown in Fig. 9, the convex portion 7 is inserted into the die hole 23 as it is, and only a portion above the convex portion 7 is pushed upward by the inner wall of the die hole 23, There was no formation of the dents 6 as described above.

Therefore, when the case prototype is manufactured by impact press using the press apparatus 31 shown in FIG. 6, it is possible to make the thickness of the side wall of a battery case uniform more reliably.

However, even in the case of the case prototype 5 manufactured by the press apparatus 11 shown in FIG. 2, since a dent does not necessarily arise in a finishing process, in the manufacturing method of the battery case of this invention, a press process It is not necessary to necessarily use the press apparatus shown in FIG. 6, and you may use the press apparatus shown in FIG.

Industrial availability

According to the present invention, when the battery case for fitting the cover to the battery case body by an upward welding method is manufactured by an impact press, the thickness of the sidewalls can be made uniform, and the fitting space for fitting the cover is separately processed. Since it can be formed without passing through, it is applicable to the first half of the method of manufacturing the battery case which fits a cover to a battery case main body by an upward welding system by an impact press.

1: battery case
2: top cover of battery case
3 step difference
4 fitting space
5: round case
6: depressed
7: pressurizing part
8: cover
11: press device
12: die
13: cavity
14: slag
15: punch for press
21: dice
22: dice body
23: die hole
24: punch for dies
25: insertion part
26: Dae Kyungbu
31: Press apparatus
32: Die
33: Cavity
34: recess
35: slag
36: Punch for Press
37:

Claims (2)

The stepped portion 3 on which the periphery of the lid 8 is placed is formed so that the fitting space 4 into which the lid 8 is fitted is provided on the inner circumference of the upper end, and the bottomed battery case has the top as the lid opening 2. As a manufacturing method of the battery case manufactured by the method of impact press,
A press step of manufacturing the case prototype 5 by an impact press,
And a finishing step of uniformly finishing the thickness of the case prototype 5 produced in the pressing step by means of a die,
The press process,
By using the die 12 having the cavity 13 and the punch 15 for press which is arrange | positioned so that relative movement with respect to the die 12 can be carried out, and the front end part can be inserted in the said cavity 13 by descending. ,
The slag 14 serving as a case material is filled into the cavity 13, the press punch 15 is lowered to insert a tip portion of the press punch 15 into the cavity 13, thereby inserting the slag 14 into the cavity 13. 14) to press the shock shock, plastic deformation of the slag 14 to produce a case prototype (5),
The finishing process,
A die 22 having a die hole 23 having an inner diameter equal to the outer diameter of the battery case 1 to be manufactured;
The inner diameter of the fitting space 4 in the battery case 1 to be manufactured, which is inserted into the insertion portion 25 having an outer diameter approximately equal to the inner diameter of the battery case 1 to be manufactured, and the upper end of the insertion part 25. By using a die punch 24 having a large diameter portion 26 having an outer diameter of approximately
By passing the case circle 5 through the die hole 23 in a state where the inserting portion 25 is inserted into the case case circle 5, the thickness of the side wall of the case circle 5 is uniform and the case circle A battery case (1) comprising a battery case (1) having a fitting space (4) formed in an inner circumference of an upper end of (5). The method of claim 1,
As for the cavity 33 in the die 32 used in the said press process, the recessed part 34 of the internal diameter substantially the same as the outer diameter of the battery case 1 manufactured is formed in the bottom part, The battery characterized by the above-mentioned. Method of manufacture of the case.

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