JP2000323107A - Manufacture of sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of sealed battery capable of seating a battery lid in a neck part of a battery case in the accurate posture at the time of caulking an opening edge of the battery case to the battery lid connected to a power generating element through a lead. SOLUTION: A sealed battery is manufactured by housing a power generating element 12 in a main body part 13 formed into a cylindrical shape with a bottom, and caulking an opening edge 16 of a battery case 10 loaded with a battery lid 20 in a neck part 14 thereof to the battery lid. In this case, a caulking device 35 having a projecting pushing part 37 at the center part and having a caulking part 3b in the peripheral edge part thereof is moved to a battery lid 20, and the battery lid 20 is pushed to the neck part 14 by the projecting pushing part. In the condition that the pushing part is moved backward, the opening edge 16 of the battery case projected from the battery lid 20 is folded inward in the radial direction by the caulking part 16 so as to be caulked to the battery lid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealed battery in which a battery cover is crimped to an opening of a cylindrical battery case.

[0002]

2. Description of the Related Art The above-mentioned sealed type battery is manufactured by various methods. One of the methods is a metal body having a hollow body and a power generation element. There is a method in which a (neck portion) is formed, a battery cover is placed on the neck portion, and then the opening edge of the battery case is bent to be caulked to the battery cover. That is, as shown in FIG. 5, a battery case 50 having a cylindrical shape with a bottom has a power generating element 5 formed by winding a plurality of positive and negative plates with a separator interposed therebetween in a roll shape.
1 is housed in the main body. On the other hand, the battery lid 55 is connected to the negative electrode plate of the power generating element 51 by a current collecting element (lead) 56, and an insulating member 57 is fitted on the bottom surface side. When attaching the battery lid 55 to the battery case 50, the caulking (drawing) member 60 is advanced to deform a portion slightly lower than the opening edge 53 of the battery case 50 radially inward to form the neck portion 52. , Insulating member 5
After the battery cover 55 fitted with 7 is installed in the opening of the battery case 50, the caulking member 61 is lowered to bend the opening edge 53 inward and to caulk the surface of the battery cover 55.

[0003]

However, since the battery lid 55 is connected to the power generating element 51 by a large number of resilient repulsive leads 56 and tends to rise from the neck 52,
The user does not always sit on the neck portion 52 correctly, and the caulking operation is not always easy. In particular, as shown in FIG. 5, when the caulking member 60 descends while the battery cover 55 is largely inclined, not only is the battery cover 55 not correctly attached to the battery case 50 but also the worst case despite the presence of the insulating member 57. In such a case, the battery cover 55 serving as the positive electrode may come into contact with the battery case 50 serving as the negative electrode to cause a short circuit (short circuit). Japanese Patent No. 2863591 discloses a method of manufacturing a sealed battery, in which a periphery of a battery cover is first restrained and positioned in a radial direction, and then an opening edge of a battery case is bent to the surface of the battery cover. However, it does not mention the inclination of the battery lid.

[0004] The present invention has been made in view of the above circumstances, and when the battery cover is attached to the opening of the battery case to the battery cover connected to the power generation element by a large number of resilient leads, the battery cover is attached to the battery case. It is an object of the present invention to provide a method of manufacturing a sealed battery in which an opening edge can be swaged while being seated in a correct posture on a neck portion of the battery.

[0005]

In order to achieve the above object, according to the present invention, a main body forming a storage chamber at one end side is provided with:
A battery case having a cylindrical opening at the other end and a neck connecting the opening and the main body, a battery element housed in the main body of the battery case, and caulking to the opening of the battery case. A method of manufacturing a sealed battery comprising: a battery lid having one terminal connected to the battery element by a conductive member; and 1) urging the battery lid against the conductive member to apply the battery cover to the neck of the battery case. And (2) a step of caulking and sealing the opening edge of the battery case with the battery lid in contact with the neck of the battery case.

According to the method for manufacturing a sealed battery according to the present invention, when the opening edge of the battery case is swaged to the battery cover, the battery cover is securely brought into contact with the neck of the battery case. The battery cover is attached to the opening of the battery case in the correct posture. As a result, it is possible to prevent the battery cover from being attached to the opening of the battery case in an inclined state, and the battery case and the battery cover from being short-circuited.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION 1) Energizing Step A feature of the present invention is that the opening edge of the battery case is caulked to the battery lid in a state in which the lifting and displacement of the battery lid have been corrected. The force step is performed before the caulking step. 2) Caulking Step At the time of caulking the opening edge of the battery case to the battery lid, it is necessary that a neck portion has already been formed in the battery case, and the battery lid has been placed thereon. However, for that,
A battery case having a cylindrical (no neck formed) opening may be prepared, and the neck may be formed by advancing the aperture member radially inward with the battery lid positioned in the opening. Alternatively, a battery case having an already formed neck portion may be prepared, a battery lid may be placed on the neck portion, and then the opening edge portion may be swaged.

3) Battery Case A plurality of protrusions projecting inward in the radial direction or annular protrusions projecting in the same direction can be adopted as a neck of the battery case for placing the battery cover. It can be formed by a diaphragm device that moves in the direction. When caulking the opening edge of the battery case, it is desirable to support the outer peripheral surface of the portion that is retreated in the axial direction from the opening edge, and a diaphragm member for forming the neck is used for that purpose. You can also. 4) The caulking device The main body has a caulking portion, and the pressing portion protrudes from the main body portion in the urging step and presses the battery cover, and does not prevent the caulking portion from caulking the opening edge of the battery case in the caulking step. is necessary. Further, the caulking portion of the main body must not caulk the opening edge of the battery case before the urging of the battery lid by the pressing portion is completed. For this reason, it is desirable that the pressing portion can be moved forward and backward in the moving direction of the caulking device with respect to the main body. Further, it is desirable that the front surface of the main body has a shape that does not interfere with the battery lid when the opening edge is caulked by the caulking portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a cylindrical sealed battery 40 is provided.
A battery case 10 is made of metal and has a bottomed cylindrical battery case 10, and a battery cover 20 attached to the opening 11 and having a generally elliptical cross section. The battery case 10 includes a main body 13 on one end side in which a power generation element 12 similar to the above-described power generation element 51 is housed, an opening edge 16 on the other end side crimped to the battery lid 20, and an opening 11. And a formed neck portion 14. The battery cover 20 has an insulating gasket 22 fitted on the lower surface thereof, and is connected to the positive electrode plate of the power generating element 12 by a number of leads 23.

The cylindrical sealed battery 40 was manufactured by the expansion device 30 and the caulking device 35 as follows. First, a battery case 10 having a bottomed cylindrical shape in which a power generation element 12 is accommodated in a main body 13 is prepared, and as shown in FIG. The device 30 is advanced radially inward. The aperture device 30 has a processing surface 30a having a substantially semicircular cross section on the front surface thereof, so that a plurality of semicircular neck portions projecting radially inward near the opening edge 16 of the battery case 10. 14 are formed. Next, the neck 1
4, the battery lid 20 is placed, and the lead 22 of the positive electrode plate of the power generating element 12 is connected to the lower surface thereof (not shown, the lead of the negative electrode plate is connected to the battery case 10). Battery cover 20
Is fitted on the lower surface side of the main body portion 21 having an elliptical cross section, and the small diameter portion 22a on the power generation element 12 side and the large diameter portion 2 on the opposite side.
2b and a gasket 22 having a flange portion 22c connecting them. In the placed state of the battery cover 20,
The opening edge 16 of the battery case 10 projects above the opening edge of the large diameter portion 22 b of the gasket 22 of the battery lid 20.

Subsequently, in order to caulk the opening edge 16 of the battery case 10 to the battery lid 20, the caulking device 35 is lowered while the expansion device 30 is in an advanced state as shown in FIG. The caulking device 35 includes a main body 36 and a main body 36.
And a spring 38 for urging the pressing member 37. On the lower surface of the main body 36, the battery cover 2 extends from the center to the middle in the radial direction.
A relief concave surface 36a which is curved in the same shape as the upper surface 21a of the main body 21 of the main body 21 is formed.
It is housed in a guide hole 41 formed at the center of the movable member a so as to be movable (advanced and retracted) in the vertical direction, and is urged downward by a spring 38 at the rear to protrude from the relief concave surface 36a. An annular caulking portion 36b formed on the peripheral portion of the lower surface of the main body 36
The radial outer surface is formed at a steep angle, and the inner surface is formed at a gentle angle.

When the caulking device 35 is lowered toward the battery lid 20, the pressing member 37 projecting from the relief concave surface 36a comes into contact with the center of the upper surface 21a of the main body 21 as shown by a two-dot chain line in FIG. Then, the battery cover 20 is pressed downward. Therefore, even if the battery cover 20 is placed on the neck portion 14 in an inclined state, the battery cover 20 is corrected to a horizontal state at this point. As the caulking device 35 descends, the pressing member 37 gradually overcomes the urging force of the spring 38 and retreats in the guide hole 41. The biasing force of the spring 38 is so selected.

Thereafter, as the caulking device 35 further descends, as shown in FIG. 4, the opening edge 16 of the battery case 10 and the gasket 22 protruding upward from the battery lid 20.
The large diameter portion 22b is bent inward in the radial direction by the caulking portion 36b and caulked to the upper surface 21a of the main body 21 of the battery lid 20. At this time, the portion of the battery case 10 where the neck portion 14 is formed tends to expand outward in the radial direction, but such deformation is prevented because the expansion device 30 keeps pressing the neck portion 14. Is done.

At the time of this caulking, as shown in FIG. 4, the pressing member 37 is located at the most retreated position in the guide hole 41, and its front end surface is flush with the deepest portion of the relief concave surface 36a. The upper surface 2 of the main body 21 of the battery cover 20
There is a gap 39 between 1a and the relief concave surface 36a of the second caulking member 35. Therefore, the battery cover 20 and the caulking device 35 do not interfere with each other and hinder the caulking of the opening edge 16 of the battery case 10. The shapes of the relief concave surface 36a and the caulked portion 36b and the positional relationship between them are selected as described above.

When the caulking is completed, the diaphragm device 3
0 is retracted radially outward, and the caulking device 35 is retracted upward. Thus, the cylindrical sealed battery 40 shown in FIG. 1 is manufactured. In this sealed battery 40, the large diameter portion 22b of the gasket 22 is swaged to the main body 21 of the battery lid 20, and the small diameter portion 22a, the flange portion 22b, and the large diameter portion 22c of the gasket 22 are respectively connected to the neck portion 14 of the battery case 10. In addition, the gap between the opening edge 16 and the main body 21 is reliably insulated. Further, the battery lid 20 is fixed to the battery case 10 by a caulking portion formed by bending the opening edge 16 of the battery case 10, and does not detach from the battery case 10 in a small amount.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a sealed battery manufactured according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the steps of the above embodiment.

FIG. 3 is a cross-sectional view showing the steps of the above embodiment.

FIG. 4 is an explanatory sectional view showing a step of the above embodiment.

FIG. 5 is an explanatory sectional view showing an example of a conventional method for manufacturing a sealed battery.

[Explanation of symbols]

10: Battery case 11: Opening 12: Power generation element 13: Main body
14: Neck 16: Opening edge 20: Battery lid 21: Body 22: Insulating member 23: Lead 30: Squeezing device 35: Caulking device 36: Body 37: Pressing member 38: Spring

Claims (2)

[Claims] 1. A battery case having a main body forming a storage chamber at one end, a cylindrical opening at the other end, and a neck connecting the opening to the main body. A method for manufacturing a sealed battery, comprising: a battery element housed in a main body; and a battery lid having a terminal crimped to an opening of the battery case and connected to one of the battery elements by a conductive member. An energizing step of urging the battery cover against the conductive member to abut on the neck of the battery case, and in a state where the battery lid abuts on the neck of the battery case,
Caulking and sealing the opening edge of the battery case. 2. A caulking device used for the caulking, comprising: a main body having a caulking portion for caulking an opening edge of the battery case; and the battery being attached to the main body by being urged by urging means. A pressing portion for pressing the lid against the neck portion of the battery case, wherein the urging step causes the pressing portion to protrude from the main body portion by the urging means so that the battery lid is attached to the neck portion of the battery case. The caulking step comprises caulking an opening edge of the battery case to the battery lid by a caulking portion of the main body in a state where the battery lid is in contact with a neck of the battery case. The method for producing a sealed battery according to claim 1, which is a step.