JP2002216717A - Sealed lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed lead-acid battery enhancing the life and reliability of the battery by more certainly sealing a seal port of a terminal part in a relatively simple constitution. SOLUTION: In the sealed lead-acid battery, a thread part of a bolt connected and fixed to a pole of a battery is penetrated from an opening part of the battery jar or the lid to the outside of the battery to become a terminal and airtight is retained by attaching and tightening a nut to the thread part between an upper surface of the pole and a lower surface at a periphery of the opening through a packing such as an O-ring. A resin having an acid-resistance, a heat- resistance and a good adhesiveness to lead or a lead alloy is coated or sprayed on a metal surface of the pole to which at least the packing is butted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a terminal sealing method for a sealed lead-acid battery.

[0002]

2. Description of the Related Art As a typical method of sealing a terminal portion, there are a method of filling a sealing agent and a method of using packing. The method using the plugging agent has a disadvantage that if the adhesion to the lead or lead alloy pole is not perfect, the sealing effect is lost due to the intrusion of the electrolyte or the oxidation of the pole surface. In the method using a packing such as an O-ring,
If the electrolyte solution stays in the space where it is not completely adhered, there is a problem that it may be difficult to ensure sufficient battery characteristics and high reliability, for example, the pole may be corroded.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to make the sealing of the terminals of a sealed lead-acid battery more reliable with a relatively simple structure, and to improve the life and reliability of the battery.

[0004]

According to the first aspect of the present invention,
A screw portion of a bolt connected and fixed to the battery pole penetrates outside of the battery from the opening of the battery case or the lid to serve as a terminal. In a sealed lead-acid storage battery which is configured to maintain airtightness by attaching and tightening a nut to the screw portion through, at least the metal surface of the pole with which the packing comes into contact has acid resistance and heat resistance. And a resin having good adhesion to lead or a lead alloy is applied or sprayed.

According to a second aspect of the present invention, there is provided the sealed lead-acid battery according to the first aspect, wherein the resin is any one of urethane, hyad and polyolefin (hot melt) having a low melting point.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In a sealed lead-acid battery of the present invention, a screw portion of a bolt connected and fixed to a pole of a battery is penetrated to the outside of the battery from an opening of a battery case or a lid to form a terminal. In a sealed lead-acid battery in which terminals are hermetically sealed by tightening a nut attached to a screw portion via a packing such as an O-ring between the lower surface and at least the metal surface of a pole on which the packing abuts To
A resin having acid resistance and heat resistance and good adhesion to lead or a lead alloy is applied or sprayed. Further, it is more effective to apply or spray the same resin on the side surface of the pole and the lower surface around the opening in addition to the upper surface of the pole where the packing comes into contact. It is to be noted that urethane, high-add or low-melting-point polyolefin (hot melt) is suitable for these resins. With such a configuration, the sealing of the terminal portion of the sealed lead-acid battery can be made more reliable, and the life and reliability of the battery can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the sealed lead-acid battery of the present invention will be described below. FIG. 1 is a sectional view showing a main part of an embodiment of the sealed lead-acid battery according to the present invention. The O-ring 3 is used as a packing between the pole 1 and the lid 2 of the battery, and the nut 10 mounted on the screw portion 6 fixedly connected to the pole 1 is pressed by pressing the nut to maintain airtightness. In the present invention, the upper surface of the pole 1 with which the O-ring 3 as a packing comes into contact has acid resistance and heat resistance, and has good adhesion to lead or a lead alloy in the present invention. Resin 4 was applied in the form of a thin film layer. At this time, low melting point polyolefin (hot melt) was used as the resin 4. The bolt 5 is connected and fixed by being cast into and embedded in the pole 1 of the battery. The screw 6 of the bolt 5 is passed through the opening 7 of the lid 2 to the outside of the battery, and the terminal 8 is
Is a structure that forms

A cylindrical hanging frame 9 is provided on the lower surface around the opening 7, the pole 1 is inserted into the hanging frame 9, and the screw 6 is inserted through the O-ring 3 from the opening 7 to the outside of the battery. Then, a nut 10 is attached to the screw portion 6 and tightened, so that the gap between the upper surface of the pole 1 and the lower surface around the opening 7 is in contact with the thin film layer of the resin 4 which is in close contact with the upper surface of the pole 1. Pressure is applied via the O-ring 3, and sufficient airtightness can be maintained.

FIG. 2 is a sectional view of a principal part showing another embodiment of the sealed lead-acid battery of the present invention. In this embodiment, a thin film layer of a resin 4 is provided not only on the upper surface of the pole 1 but also on the side surfaces thereof. Things.

FIG. 3 is a sectional view showing a main part of another embodiment of the sealed lead-acid battery according to the present invention.
, The lower surface around the opening 7 of the lid 2 and the inner surface of the hanging frame 9.

In the present invention, a resin 4 having acid resistance and heat resistance and having good adhesion to lead or a lead alloy is applied or sprayed on at least the metal surface of the pole 1 with which the packing comes into contact, to form a thin film layer. Since the packing is provided, the packing is compressed and closely adhered between the upper surface of the pole 1 and the lower surface of the periphery of the opening 7 by tightening and mounting the nut 10, so that airtightness is maintained at least in the packing contact portion, Since there is no possibility of pole corrosion due to intrusion of the electrolytic solution throughout the life, there is no possibility that the pole surface is corroded to cause airtight leakage, and sufficient battery characteristics and high reliability can be ensured.

[0012]

As described above, according to the present invention, the sealing of the terminals of a sealed lead-acid battery can be made more reliable with a relatively simple structure, and the life and reliability of the battery can be improved. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of a sealed lead-acid battery according to the present invention.

FIG. 2 is a sectional view of a main part showing another embodiment of the sealed lead-acid battery of the present invention.

FIG. 3 is a sectional view showing a main part of another embodiment of the sealed lead-acid battery of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pole 2 Lid 3 O ring 4 Resin 5 Bolt 6 Screw part 7 Opening 8 Terminal 9 Hanging frame 10 Nut

Claims (2)

[Claims] 1. A screw portion of a bolt connected and fixed to a pole of a battery penetrates from the opening of a battery case or a lid to the outside of the battery to serve as a terminal, and is provided between a top surface of the pole and a lower surface around the opening. In a sealed lead-acid battery, which is configured to maintain airtightness by mounting and tightening a nut on the screw portion via a packing such as a ring, at least the metal surface of the pole contacted with the packing has acid resistance and A sealed lead-acid battery characterized by being coated or sprayed with a resin having heat resistance and good adhesion to lead or a lead alloy. 2. The sealed lead-acid battery according to claim 1, wherein said resin is any one of urethane, hyad or polyolefin (hot melt) having a low melting point.