JPH10172535A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a post made of a lead alloy of a lead-acid battery and retard the progress of corrosion of the post made of a lead alloy of the head-acid battery by inserting a core metal made of copper or a copper alloy in a post of the lead-acid battery when the post made of a lead alloy is formed in the lead-acid battery. SOLUTION: When a post of a lead-acid battery is formed in a cast-on-strap process, a lead plated copper core metal 7 and an electrode plate lug 2 of an electrode plate 1 made of copper or a copper alloy are inserted into the specified position of a casting mold 3 made of steel, and a molten lead alloy 4 is poured. A lead-acid battery in which a core metal 7 made of copper or a copper alloy is inserted in the post of the lead-acid battery is obtained. The shape of the core metal 7 is good in a simple rod, a recess is formed in a part being inserted into the lead alloy of the core metal 7, the coming off of the core metal 7 is prevented, a nut hole is formed in a part not inserted, and this part is also used as a connecting component for being connected to batteries or for being connected to a load after the storage battery is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a terminal portion of a lead storage battery.

2. Description of the Related Art Lead-acid batteries are manufactured by melting and pouring lead alloy made of a lead alloy into a mold with a burner to form straps and poles, and simultaneously connecting ears of a group of electrodes. There is a cast-on-strap (hereinafter referred to as COS) method in which an alloy is poured and a strap or pole is formed, and at the same time the ears of the electrode group are connected.

In recent years, computers have become widespread, and CVCFs have come to be used as power supply backups. The load of the CVCF is relatively short, and a large current discharge is required. It is necessary to design the diameter of the pole to be large so that the pole is not melted by a large current discharge. However, this has a disadvantage that the weight of the pole is increased. In addition, when the diameter of the pole is increased, the solidification shrinkage of the lead alloy in the pole is increased, and a void is easily generated in the center of the pole. Starting from this cavity, the corrosion of the pole portion progresses during use of the lead-acid battery, and eventually there is a problem that the discharge cannot be performed and the load is reduced. As a countermeasure, prepare pole poles in which a copper alloy core metal has been inserted in advance into a lead alloy as a separate part, and after forming straps on the electrode plate group, replace the mold (welding jig) with the pole pole of another part. Although a method of welding with a strap is employed, it is a complicated operation.

The present invention is characterized in that a core metal made of copper or a copper alloy is inserted at the time of forming a pole column made of a lead alloy.

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment of the COS system. FIG. 2 shows a conventional COS method. FIG. 2 shows a COS method according to the present invention. 2 and 3, reference numeral 1 denotes an electrode plate group made of lead and a lead alloy, 2 denotes an electrode plate ear made of a lead alloy, 3 denotes a steel COS mold, 4 denotes a molten lead alloy, 5 denotes an electrode column, 6 2 is a strap portion, and 7 in FIG. 2 is a copper cored bar with lead plating. Although the shape of the core metal may be a simple rod shape, in the present embodiment, a concave portion is provided in a portion inserted into the lead alloy of the core metal, and the core metal has a structure to prevent the core metal from coming off,
In addition, a nut hole was provided in a portion where no insert was made, and this portion was formed into a shape that could also be used as a connection component for connection between batteries or connection with a load after the storage battery was completed. FIG. 1 is a sectional view showing a main part of a completed pole according to an embodiment of the present invention. The specific resistance of copper used for the metal core is 1.67 × 10 ⁻⁶ (Ω · cm), and the specific resistance of lead is 20.65 × 10 ⁻⁶ (Ω · cm), which is about 1
/ 10, and the specific gravity of copper is 8.96 (g / c
m ³ ), which is smaller than the specific gravity of lead of 11.35 (g / cm ³ ), so that the weight of the pole portion could be reduced by about 40%. Further, when the pole portion of the present example was cut and polished, and the state inside the pole column was examined, no internal defects such as cavities were found.

As described above, the present invention has an excellent effect that an inexpensive pole column having no internal defects can be formed at a low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a pole completed according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a COS of a conventional lead storage battery.

FIG. 3 is a diagram showing an example of the COS of the lead storage battery according to the present invention.

[Explanation of symbols]

 1. Electrode group made of lead and lead alloy. 2. Electrode ear made of lead alloy. 3. Steel COS mold. 4. Molten lead alloy. 5. Pole section. 6. Strap section. 7. Copper cored bar with lead plating.

Claims (1)

[Claims] 1. A lead-acid battery, characterized in that a core metal made of copper or a copper alloy is inserted at the time of forming the lead column made of a lead alloy.