JPH0757765A - Manufacture of sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To aim at the mass production of sealed lead-acid battery having the even quality, of which inside space is filled with acid-resistant powder and granule perfectly and evenly, at a low cost. CONSTITUTION:In the manufacturing method of sealed lead-acid battery for filling inside of a battery with acid-resistant powder or acid-resistant granule or both of them together with a plate group, after housing a plate group 3 and the acid-resistant powder or the acid-resistant granule or both of them in a battery jar 1, a cap body 8 is formed directly in an opening part of a battery jar to seal to a space between the cap body 8 and the battery jar simultaneously. The cap body 8 can be also formed by providing a separator 9 at a part or the whole surface of a boundary between the acid-resistant powder or the acid-resistant granule and the cap body 8 before forming the cap body 8.

Description

Detailed Description of the Invention

The present invention relates to an improvement in a method for manufacturing a sealed lead storage battery.

[0001]

2. Description of the Related Art Conventionally, in a sealed lead acid battery, a structure has been proposed in which acid-resistant powder or granules are filled between an electrode plate group, a battery case, and a lid in order to retain an electrolytic solution and eliminate an internal space. ing.
In the manufacturing process, as shown in the example of FIG. 2, after the electrode plate group 3 is stored in the battery case 1, the lead bushing 12 is inserted in advance and the molded lid 2 is inserted in the battery case opening. The lead bushing 12 inserted into the lid body 2 and the cathode column 5 and the anode column 6 of the electrode plate group 3 are externally melt-sealed by heat sealing or adhesive bonding, and then the lid body is further sealed. The acid resistant powder or granules 4 were filled through the opening for attaching the safety valve 13 of No. 2. Since it is structurally extremely difficult to heat-weld or bond the battery case and the lid body 2 after filling powder or the like up to the upper portion of the joint 16 between the battery case 1 and the lid body 2, It is a process that is.

[0002]

However, the conventional storage battery assembling method as described above has the following drawbacks.

(A) A safety valve 13 for the powder 2 and granules 4 on the lid 2.
It is extremely difficult to fill the space portion on the back side of the lid body 2 from the attachment opening portion with a constant density, and it is easy to form a place with a low filling density in the back space portion of the lid body 2 and the storage battery vibrates. When used as a power source for electric vehicles, the powder and granules 4 around the electrode plate group 3 move and the density of the powder near the electrode plate group 3 changes, adversely affecting the characteristics and life of the storage battery. Exert.

(B) A safety valve 13 for the powder 2 and granules 4 on the lid 2.
Since the filling is performed from the attachment opening, the filling process requires a long time, which is not suitable for mass production, resulting in a high cost storage battery.

The present invention has been made to solve the above problems, and provides a sealed lead acid battery of uniform quality in which the space inside the battery is completely and uniformly filled with acid resistant powder or granules. It is an object of the present invention to provide a manufacturing method that can be mass-produced.

[0006]

The present invention is intended to achieve the above object by the following method. First
The manufacturing process of the present invention will be described with reference to the drawings. 1st process: A preformed battery case 1 and an electrode plate group 3
To store. 2nd process ... From the opening of the battery case 1 which finished the 1st process,
The acid-resistant powder or granules or both 4 are filled up to a position lower than the open end face of the battery case 1 and higher than the upper end of the separator 14 of the electrode plate group 3. Third step: The battery case 1 that has completed the second step is mounted on the mold 7. Even if the order of Steps 1 to 3 is changed, the effect does not change. Fourth step: the lid 2 is provided on the opening of the battery case 1 and the upper part of the mold 7.
A mold 8 having a cavity and forming a pair with the mold 7 is mounted for molding. Fifth step: The lid 2 is molded by injecting or injecting a synthetic resin into the cavity from the gate portion 15 of the mold 8 and the opening end of the battery case 1 and the joining portion of the lid 2 are joined together. Seal it.

[0007]

EXAMPLE An example of the present invention will be described with reference to FIG.
After accommodating the electrode plate group 3 in the battery case 1 preformed with a thermoplastic polypropylene resin, the fine powder 4 of silica as an acid resistant powder is filled with the open end of the battery case 1 and the separator 1 of the electrode plate group 3.
Fill up to an intermediate position with the upper end of 4. After that, a flat plate-shaped separator body 9 for preventing the synthetic resin for molding the lid from permeating into the silica fine powder 4 is provided on the entire upper surface of the filled silica fine powder 4. Depending on the packing density of fine silica powder, this separator body 9 may be practically problem-free even if it is omitted. Further, it may be effective to dispose the separator body only on a part of the upper surface of the fine silica powder 4. After that, the battery case 1 is attached to the die 7, and the die 8 is fitted together. Next, low-foam polypropylene resin is injected from the injection gate portion 15 of the mold 8 to mold the lid body 2 and at the same time seal the opening of the battery case 1 and the lid body 2. At the same time, the portion where the cathode pillar 5 and the anode pillar 6 penetrate the lid 2 may be sealed.

[0008]

According to the present invention, the following effects can be obtained,
Its industrial value is great.

(A) Since it is possible to apply a uniform pressure to the powder filled inside the storage battery, there is no decrease in the powder density due to vibration, the performance and life of the storage battery are uniform, and stable long-life characteristics are obtained. .

(B) Since the steps of adhering the battery case and the lid and heat welding and the step of sealing the poles and the lead bushings from the battery manufacturing process can be omitted, the manufacturing cost can be reduced as compared with the conventional method.

(C) Since the powder can be filled from the entire opening end of the battery case in the powder filling step, the time required for the step can be shortened as compared with the case of filling from the conventional safety valve mounting opening. As a result, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a storage battery showing a conventional manufacturing method.

FIG. 2 is a sectional view of an essential part of an embodiment of the present invention.

[Explanation of symbols]

1 Battery Case 2 Lid 3 Electrode Plate Group 4 Acid-Resistant Powder or Granule or Both 5 Cathode Pillar 6 Anode Pillar 7 Mold 8 Mold with Lid Molding Cavity 9 Silica Fine Powder and Lid 2 Separator body 11 Lead bushing 12 Lead bushing 13 Safety valve 14 Separator of electrode plate group 15 Gate part for injecting or injecting resin into the cavity of the mold 8 16 Joint part of battery case 1 and lid body 2

[Procedure amendment]

[Submission date] August 2, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a storage battery showing a conventional manufacturing method.

FIG. 3 is a sectional view of an essential part showing an embodiment of the present invention.

[Explanation of symbols] 1 battery case 2 lid 3 electrode plate group 4 acid resistant powder or granules or both 5 cathode column 6 anode column 7 mold 8 mold with lid molding cavity 9 silica fine powder And lid 2 separator body 11 lead bushing 12 lead bushing 13 safety valve 14 electrode plate group separator 15 gate section for injecting or injecting resin into the cavity of mold 8 16 joint section between battery case 1 and lid 2

Claims (2)

[Claims] 1. A method of manufacturing a sealed lead-acid battery, comprising an electrode group and an acid resistant powder and / or granules filled in the battery case, wherein the electrode group and the acid resistant powder are placed in the battery case. Alternatively, a method for producing a sealed lead-acid battery, characterized in that, after accommodating the granules or both, a lid is directly formed in the opening of the battery case, and the space between the lid and the battery case is sealed at the same time. 2. Before molding the lid, a separate body is placed on a part or the whole of a place which becomes a boundary between the acid-resistant powder and / or granules and the lid, and then the lid is molded. The method for producing a sealed lead-acid battery according to claim 1, characterized in that.