JP2001126680A - Sealed lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of fabricating a sealed lead storage battery to prevent the upper cover 3 from being detached owing to vibration when transporting the assembly of the upper cover 3 attached to the middle cover 2. SOLUTION: The upper cover 3 is almost rectangular, including a melted portion 6 of a different thickness, and valve guard portion 7, which is divided by grooves 13 according to the position of the safety valve 5 so as to obtain a connected structure. In this arrangement, the sealed lead storage battery is fabricated by using the cover 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead storage battery.

[0002]

2. Description of the Related Art A general sealed lead storage battery is manufactured by the following steps. That is, the battery case 1 containing the power generation element
Then, the inner lid 2 is welded, an electrolytic solution is injected, and then a battery case is formed. Then, a cap-shaped rubber safety valve 5 is attached to the inner lid 2. Thereafter, as shown in FIG. 3, the upper lid 3 is supplied to the open surface of the housing portion 8 of the inner lid 2, and the upper lid 3 is moved (transported) with the upper lid 3 placed on the inner lid 2, and the welding machine 12 is used. The upper lid 3 and the inner lid 2 are welded.

The housing portion 8 of the inner lid 2 has a shape shown in FIG. That is, the inside of the housing portion 8 is composed of a step portion 9a for supporting the upper lid and a flat portion 9b for installing the safety valve, and has a substantially stepped shape. The safety valve 5 is mounted on the flat surface 9b.

On the other hand, when the conventional upper lid 3 is viewed from the back, FIG.
The welding part 6 and the safety valve holding part 7
The thickness of the welded portion 6 of the upper lid 3 is,
The shape is smaller than the thickness dimension of the safety valve retainer 7. As a result, when the upper lid 3 is formed of a resin, a bow-like warp is formed to protrude upward. After the welding portion 6 of the upper lid 3 and the step portion 9a of the inner lid 2 are opposed to each other, these opposed portions are welded using an ultrasonic welding machine.

However, the above-mentioned bow-shaped upper lid
When 3 is used, after the upper lid 3 is supplied to the housing portion 8 of the inner lid 2, during the movement until they are welded,
There has been a problem that the upper lid 3 is easily detached from the housing portion 8 due to vibration or the like, and is easily displaced.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an
In order to prevent the upper lid 3 from being detached from the housing section 8 due to vibration or the like or from being misaligned during the movement of the upper lid 3 from the supply to the housing section 8 of the inner lid 2 until they are welded.

[0007]

According to the present invention, an inner lid having a plurality of safety valves is welded to a battery case containing a power generating element, and a housing portion of the inner lid is provided. In a sealed lead-acid battery produced by welding an upper lid to an open surface of the above, the upper lid has a welded portion having a different thickness and a safety valve retainer, and the safety valve retainer corresponds to a position of the safety valve. And are formed continuously.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An experiment was conducted using a 12V-38Ah sealed lead-acid battery connected in series with 6 cells and formed into a battery case. In the following (Comparative Examples) and (Examples), the battery case 1 and the inner lid 2 which are conventionally used were used. The housing section 8 of the inner lid 2 is composed of the step section 9a and the flat section 9b as described above (FIG. 4).

An inner lid 2 is welded to a battery case 1 containing a power generating element, and an electrolytic solution is injected, followed by formation of a battery case. A cap-shaped rubber safety valve 5 is attached to the six cells of the inner lid 2.
Attach. Thereafter, as shown in FIG. 3, two types of upper lids 3 having different shapes, which will be described later, are supplied to the open surface of the housing portion 8 of the inner lid 2, and the upper lid 3 is moved (transported) while being placed on the inner lid 2. Then, the upper lid 3 and the inner lid 2 were welded using the welding machine 12.

[0010]

Example (Comparative Example) Upper lid 3 used in Comparative Example
Has a substantially rectangular shape with a length of about 180 mm and a width of about 30 mm, the thickness of the welded part 6 is about 1.5 mm, and the thickness of the safety valve holding part 7 is about 3.0 mm, which is conventionally used (FIG. 2). Other methods for producing a sealed lead-acid battery are as described above.

(Embodiment) Upper lid 3 used in the embodiment
As viewed from the back, as shown in FIG. 1, it has a substantially rectangular shape with a length of about 180 mm and a width of about 30 mm, and is provided with a welding portion 6 and a safety valve holding portion 7. The safety valve holding portions 7 are continuously provided in a state of being divided into six by the groove portion 13, and the number corresponding to the number of the safety valves is formed. The upper cover 3
The thickness of the welded part 6 is about 1.5 mm, and the thickness of the safety valve holding part 7 is about 3
mm. By forming the upper lid 3 in this way,
The occurrence of warpage when molded with resin can be reduced. Other methods for producing a sealed lead-acid battery are as described above.

Each of 12V-38Ah sealed lead-acid batteries is 100
Each of them was prepared and formed into a battery case. After supplying the above two types of upper lids 3 to the housing portion 8 of the inner lid 2, the frequency at which the upper lid 3 comes off due to vibration or the like and the position shifts during movement until welding is measured (Table 1). ). From Table 1, it can be seen that the upper lid 3 of the present invention hardly bends, so that detachment and displacement during movement can be greatly reduced. In addition, since the upper lid 3 is formed by connecting the safety valve holding portions 7 corresponding to the positions of the respective safety valves 5, it is possible to uniformly hold the respective safety valves 5 and to generate gas at the time of overcharging. The variation in the operating pressure of the safety valve 5 was reduced.

[0013]

[Table 1]

[0014]

As described above, the upper lid 3 of the present invention has less warpage, and can greatly reduce the displacement and displacement of the sealed lead-acid battery during the upper lid welding process, and reduce the variation in the operating pressure of each safety valve. can do.

[Brief description of the drawings]

FIG. 1 is a schematic view of an upper lid shape according to the present invention as viewed from a back surface.

FIG. 2 is a schematic view of a conventional upper lid shape viewed from the back.

FIG. 3 is a schematic view of an upper lid welding step of the sealed lead storage battery.

FIG. 4 is a schematic diagram of a sealed lead storage battery structure.

[Explanation of symbols]

1: battery case, 2: inner lid, 3: upper lid, 4: terminal, 5: safety valve, 6: welded part, 7: safety valve holding part, 8: housing part, 9a: step part, 9b: flat part, 12: Welding machine,
13: Groove

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoichi Nomura 2-8-7 Nihonbashi Honcho, Chuo-ku, Tokyo F-term in Shin-Kobe Electric Co., Ltd. 5H011 AA09 AA13 CC02 DD13 DD26 KK01 5H012 AA07 BB02 EE01 EE09 GG01 JJ02 JJ06 5H028 AA01 BB01 BB04 BB05 BB19 CC07 CC10 EE06 HH05

Claims (1)

[Claims] 1. A sealed lead-acid battery produced by welding an inner lid provided with a plurality of safety valves to a battery case containing a power generating element, and welding the upper lid to an open surface of a housing portion of the inner lid. Wherein the upper lid has a welded portion having a different thickness and a safety valve retainer, and the safety valve retainer is formed continuously in correspondence with the position of the safety valve. Storage battery.