JPH09129190A - Cylindrical battery molding equipment - Google Patents

Abstract

(57) [PROBLEMS] To provide a cylindrical battery molding device that can reliably prevent deformation and damage of a battery can when a load is applied to the battery can in an axial direction. provide. A battery can pressing mechanism (1) constituting a molding device (10).
4 includes a receiving member 20, and the receiving member 20 is formed with a tapered receiving surface 28 that supports the bottom portion 12b of the battery can 12. Since the bottom portion 12b of the battery can 12 is placed on the tapered receiving surface 28, the load applied in the axial direction of the battery can 12 is dispersed, and the deformation and damage of the bottom portion 12b can be reliably prevented. it can.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical battery molding apparatus for axially pressing and forming a cylindrical battery can with a bottom.

[0002]

2. Description of the Related Art Generally, a battery can which constitutes a cylindrical battery has a bottomed cylindrical shape, and after a power generator is inserted therein, the battery can projects radially inward near an opening. An annular groove is formed. The annular groove has a function of fixing the sealing component or securing a space for inserting a mold in the caulking process of the opening in a state where the power generator and the sealing component are separated, for example.

After the annular groove is formed in the battery can, a liquid injection operation is performed in the battery can and a sealing component such as a safety valve is inserted. Then, a sealing and crimping process is performed to fold the opening of the battery can inward, whereby a battery is obtained. By the way, in the step of forming the annular groove, it is necessary to apply a load to the battery can in the axial direction.
At this time, if the bottom of the battery can is supported by a flat surface, the bottom is deformed via a moment generated when a force is applied to the battery can in the axial direction.

Therefore, as shown in FIG. 6, the corner radius Rd of the lower mold 2 for supporting the bottom portion 1a of the battery can 1 and the corner radius Rc of the bottom portion 1a have a relation of Rc <Rd. Battery manufacturing method "(Japanese Patent Laid-Open No. 63-24
No. 4550) (hereinafter referred to as Conventional Example 1) and as shown in FIG. 7, a receiving mold 4 supporting a bottom portion 3a of a battery can 3 is provided with a step portion 5, and a corner of the step portion 5 serves as the bottom portion. There is known a "receiving type for processing a cylindrical battery can" (hereinafter referred to as JP-A-7-57703) (hereinafter referred to as Conventional Example 2) configured to support the periphery of 3a.

[0005]

However, in the above-mentioned conventional example 1, the contact angle between the bottom portion 1a of the battery can 1 and the lower mold 2 varies depending on the size of the battery can 1 and the size of the lower mold 2. It has been pointed out that there is a problem in that the deformation of the bottom portion 1a cannot be effectively prevented because it is not constant.

Further, in the above-mentioned conventional example 2, since the corner of the step portion 5 abuts on the bottom portion 3a of the battery can 3, the bottom portion 3a is damaged when an axial load is applied to the battery can 3. There is a problem that it will occur. The present invention solves this type of problem, and when a load is applied to the battery can in the axial direction, the deformation and damage of the battery can can be reliably prevented, and the structure is simple. It is an object to provide a molding device for a cylindrical battery.

[0007]

In order to solve the above problems, the present invention is directed to an axial direction of a battery can with the bottom of the battery can supported by a tapered receiving surface provided on a receiving stand. A pressing force is applied to. Therefore, when an axial load is applied to the battery can, the bottom of the battery can is supported by the tapered receiving surface that is inclined from the diametrical direction of the battery can, so that the load can be applied to the bottom of the battery can. It is possible to disperse and receive at the side portions, and it is possible to reliably avoid deformation and damage of the bottom portion.

Further, the inclination angle θ ° of the tapered receiving surface is 3
If it is less than 0 °, crushing may occur at the bottom of the battery can, while if this inclination angle θ ° is 70 ° or more,
The battery can may be crushed in the radial direction and the bottom may bulge. Therefore, by setting the angle θ ° within the range of 30 ° to 70 °, it becomes possible to surely form a high-quality battery can without deformation and scratches.

[0009]

1 is a schematic configuration diagram of a cylindrical battery molding apparatus 10 according to an embodiment of the present invention. The molding apparatus 10 includes a battery can pressing mechanism 14 for rotating the battery can 12 while pressing the battery can 12 in the axial direction (direction of arrow A),
A groove forming mechanism 18 for forming an annular groove 16 near the opening 12 a of the battery can 12.

The battery can pressing mechanism 14 includes a receiving member 20 for supporting the bottom portion 12b of the battery can 12, a first spring 22 for pressing the receiving member 20 upward, and an opening 12a side of the battery can 12. The mandrel 24 that supports and is rotatable in the arrow X direction and the second spring 26 that presses the mandrel 24 downward are provided. As shown in FIG. 2, the receiving member 2
In No. 0, a tapered receiving surface 28 is formed on the central portion side. The tapered receiving surface 28 is the bottom 12 of the battery can 12.
The diameter is reduced in a direction away from b (direction of arrow A1) and is inclined in the axial direction (direction of arrow A) by an angle θ from the diameter direction of the battery can 12 (direction of arrow B). This angle θ ° is in the range of 30 ° to 70 °, preferably 45 °.
It is set within the range of -60 °.

As shown in FIG. 1, the groove forming mechanism 18 includes
Main body 3 movable in the axial direction (direction of arrow C) of the battery can 12 by a feeding means (not shown) such as a cam or a ball screw.
0 and the roller 3 rotatably supported by the main body 30
2 is provided. The roller 32 has a V-shaped tip, and the roller 32 has a tip angle of 30 ° to 4 °.
The angle is set to 5 °, more preferably about 40 °.

The operation of the molding apparatus 10 thus constructed will be described below. First, the battery can 1 is attached to the tapered receiving surface 28 of the receiving member 20 constituting the battery can pressing mechanism 14.
2 is placed. The power generator 34 is previously inserted into the battery can 12, and the mandrel 24 is engaged with the opening 12a side thereof. Therefore, the battery can 12 is provided with the receiving member 20.
And the first and second springs 2 acting on the mandrel 24
With the compressive force applied in the axial direction via 2, 26,
While being rotated in the direction of the arrow X, the roller 32 that constitutes the groove forming mechanism 18 is integrally formed with the main body portion 30 in the battery can 1.
It moves in the axial direction of 2. As a result, the tip of the roller 32 engages in the vicinity of the opening 12a of the battery can 12, and the annular groove 16 is formed corresponding to the shape of the tip.

Next, the battery can 12 is removed from the molding apparatus 10, and then an electrolytic solution is poured into the battery can 12.
As shown in FIG. 3, the gasket 36 and the sealing member 38
Is incorporated. Further, the opening 12 of the battery can 12
The end on the a side is bent inward and caulked. In this case, in this embodiment, as shown in FIG. 2, the receiving member 20 is formed with a tapered receiving surface 28 for supporting the bottom portion 12b of the battery can 12. Therefore, when a load P (see FIG. 1) acts on the battery can 12 from above and below, the load P is applied to the bottom 12b and the side wall 12c of the battery can 12.
You can receive with dispersed. Therefore, the bottom portion 12b
Unlike the case where the load P acts only on the bottom portion 12b, the bottom portion 12b is not crushed or deformed.

Moreover, since the bottom portion 12b of the battery can 12 is supported by the tapered receiving surface 28, it is possible to reliably prevent the occurrence of scratches and the like when the corners of the stepped portion engage with the bottom portion 12b. It will be possible. As a result, it is possible to obtain an effect that a high-quality battery can 12 that is free from deformation and damage is formed. Next, referring to FIG. 2, the battery can 1 in which the wall thickness t is set to t = 0.3 mm and the corner radius R is set to R = 0.7 mm
2, each receiving member 2 having various inclination angles θ °
The forming process of the annular groove portion 16 was performed by the forming apparatus 10 including 0. The results are shown in Table 1.

[0015]

[Table 1]

However, ⊚: good ○: good ×: not good At that time, when the angle θ ° of the tapered receiving surface 28 is small (θ ° = 10 °), as shown in FIG. A crush 40 has occurred. On the other hand, the angle θ
When ° is larger than necessary (θ ° = 80 °), as shown in FIG. 5, the strength of the battery can 12 cannot withstand the radial component force and is crushed in the radial direction to swell to the bottom 12b. The part 42 has occurred.

On the other hand, when the angle θ ° of the tapered receiving surface 28 is set in the range of 30 ° to 70 °, the battery can 12
The deformation was extremely small and a good molding operation was performed.
In particular, when the angle θ ° is set in the range of 45 ° to 60 °, the bottom portion 12b of the battery can 12 can be maintained at 90 ° as much as possible, and the battery can 12 can be processed at a high temperature. The advantage is that it can be molded to quality.

In the present embodiment, the molding apparatus 10 for forming the annular groove 16 near the opening 12a of the battery can 12.
However, the present invention can be used in all the steps of applying a load to the battery can 12 in the axial direction, such as the sealing and caulking process of the battery can 12 and the total height adjusting process of aligning the heights of the batteries.

[0019]

In the cylindrical battery molding apparatus according to the present invention, a load is applied to the battery can in the axial direction with the bottom of the battery can supported by the tapered receiving surface provided on the pedestal. Therefore, this load can be distributed and received by the bottom portion and the side portion of the battery can, and the deformation and damage of the bottom portion can be reliably avoided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cylindrical battery molding apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional explanatory view of a receiving member which constitutes the molding apparatus.

FIG. 3 is a vertical cross-sectional explanatory view of a battery which has been subjected to a sealing caulking process.

FIG. 4 is an explanatory diagram of a deformed state when the angle θ ° is small.

FIG. 5 is an explanatory diagram of a deformed state when the angle θ ° is too large.

FIG. 6 is an explanatory view of a lower mold for supporting a battery can and a battery can according to a conventional technique.

FIG. 7 is an explanatory view of a battery can and a receiving mold according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Molding apparatus 12 ... Battery can 14 ... Battery can pressing mechanism 16 ... Annular groove part 18 ... Groove part forming mechanism 20 ... Receiving member 22, 26 ... Spring 24 ... Mandrel 28 ... Tapered receiving surface 32 ... Roller

Claims (2)

[Claims] 1. A battery can pressing mechanism for axially pressing a bottomed cylindrical battery can, wherein the battery can pressing mechanism supports the bottom of the battery can and moves away from the bottom. A cylindrical battery forming apparatus, comprising a receiving member provided with a tapered receiving surface that reduces in diameter. 2. The molding apparatus according to claim 1, wherein the tapered receiving surface is inclined in the axial direction by an angle θ ° from the diameter direction of the battery can, and the angle θ ° is 30 ° ≦ θ °. A cylindrical battery molding apparatus characterized by satisfying a relational expression of ≦ 70 °.