JPH07201333A - Lead acid battery grid - Google Patents

Abstract

PURPOSE:To improve the welding condition of an ear part and a strap by forming an ear part consisting of lead-tin-based alloy layers on both sides in the upper part of a grid body. CONSTITUTION:A thin film 3 of a Pb-Sn alloy is layered on both sides of an ear part 2 formed in the upper part of an expanded grid body 1 wherein the thin film has the same surface as the surface of the grid body 1. As a result, at the time when the grid body l is filled with an active material, even if the ear part 2 is masked with a planking plate, the alloy layer 3 is prevented from wearing and peeling due to the convergence of friction force on the alloy layer 3 formed on the surface 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery, and more particularly to an ear portion of its lattice.

[0002]

2. Description of the Related Art Generally, in lead-acid batteries, lead-calcium-
The ears of the lattice made of tin (Pb-Ca-Sn) alloy are connected by the strap made of lead-tin (Pb-Sn) alloy. However, since the welding of the ears and the strap is a joint between different alloys, the weldability of these is poor and a gap is apt to be formed at the boundary between them due to corrosion.

When a large current flows through the lead storage battery in this state, a spark is generated between the ear portion and the strap of the lattice body, and the spark may ignite the hydrogen gas stored in the battery to explode the battery. there were.

Therefore, in order to improve the weldability between the latticed ear portion and the strap, a thin film layer of a lead-tin (Pb-Sn) -based alloy having a low melting point and easily compatible with the strap is provided on the surface of the ear portion. Then, the weldability between the ear and the strap was improved.

[0005]

However, Pb-
When a thin film of Pb-Sn alloy is applied to the ears of the Ca-Sn alloy lattice, first, Pb- for producing the lattice is used.
A thin film piece of Pb-Sn alloy was placed on the upper surface of a portion of the Ca-Sn alloy flat plate forming the ear portion and rolled. For this reason, the surface of the ear portion to which the thin film is applied has a height higher than that of the surface of the lattice member to which the thin film is not applied, and is in a raised state.

When the lattice body is filled with the active material, the ear portion is masked with a covering plate to prevent the active material from adhering to the ear portion. The applied thin film may be worn by the friction with the floor plate or may be removed from the upper surface of the ear.

Therefore, the desired effect may not be obtained by applying the thin film to the ears, and the welding state between the ears and the strap is deteriorated as shown in FIG.

The present invention is intended to solve such a problem and prevents the thin film of the Pb-Sn alloy, which is applied to the ear portion of the lattice member to enhance the weldability with the strap, from being worn or removed. Thus, the present invention provides a lattice body capable of improving the welded state of the ear portion and the strap.

[0009]

In order to solve the above-mentioned problems, the lead-acid battery lattice of the present invention is a lattice having an ear portion on the top, and the intermediate layer has the same composition as the lattice. It is a lead alloy and the ears are composed of three layers, the layers on both sides are made of a lead-tin (Pb-Sn) alloy, and the surfaces of the layers on both sides are flush with the surface of the lattice. It is an eggplant.

[0010]

In the lead-acid battery grid of the present invention, since the Pb-Sn alloy layer that is flush with the surface of the grid is provided on the surface of the ear, the Pb-Sn alloy layer on the surface of the ear is It is not raised above the lattice part.

Therefore, even when the ears are masked with the floor plate when the lattice body is filled with the active material, the friction is concentrated on the alloy layers applied to the surfaces of the ears and the alloy layers are not worn or removed. Without the alloy layer that is surely applied to the ears,
It is possible to excellently weld a strap made of a b-Sn alloy.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 (A) is a front view of an expanded grid for a lead storage battery according to the present invention, and FIG. 1 (B) is a side sectional view of the grid.

1 is 0.07% by weight of Ca and 0.2% of Sn
An expanded lattice body made of a Pb-Ca-Sn alloy containing 5% by weight, 2 is an ear portion, 3 is an ear portion, and is a thin film of a Pb-Sn alloy whose surface is flush with the surface of the lattice body. , Sn in an amount of 50% by weight.

Next, a method of manufacturing this lattice will be described. First, as shown in FIG. 2, a sheet 4 made of a Pb-Ca-Sn alloy and having a thickness of 0.7 mm is manufactured. In this sheet, the thickness of the central portion that forms the ears in a later step is thinner than the other portions, and both surfaces of the central portion are concave.

Then, P is formed in the recessed portions on both sides of the central portion.
Rolled b-Sn alloy foil to form the same surface as the sheet surface P
A b-Sn alloy layer is formed. Then, the sheet is subjected to an expanding process to obtain a lattice, and then the central portion of the sheet provided with the Pb-Sn alloy layer is masked with a floor plate to fill the lattice with a predetermined active material. Then, the central portion of the sheet is cut into a predetermined shape to prepare an electrode plate, and a plurality of the electrode plates are superposed on each other, and Pb containing 2.5% by weight of Sn in the upper portion of the ear portion.
-The strap 5 made of Sn alloy is formed.

As a result, as shown in FIG. 3, when the latticed ear portions of the present invention are connected by straps, the thin film applied to the surface of the ear portions is worn or removed by friction with the floor plate. It was possible to make a good connection between the ear and the strap.

[0018]

As described above, the lead-acid battery lattice of the present invention is a lattice having an ear portion on the upper portion, and the ear portion is composed of three layers, and the layers on both sides are lead-tin ( Since the surfaces of these layers are made of Pb-Sn) -based alloy and are flush with the surface of the lattice, even when the lattice is filled with the active material, the ears may be masked with a floor plate. Friction is not concentrated on the alloy layer formed on the surface of the portion and the alloy layer is not worn or removed.

Therefore, the ears and the strap made of the Pb-Sn alloy can be welded well by the Pb-Sn alloy layer which is surely applied to the ears.

[Brief description of drawings]

FIG. 1A is a front view of an expanded lattice of the present invention, and FIG. 1B is a side sectional view of the lattice.

FIG. 2 is a diagram showing a state at the time of manufacturing the same lattice body.

FIG. 3 is a diagram showing a welding state of an ear portion and a strap of the lattice body.

FIG. 4 is a diagram showing a welding state of an ear portion and a strap of a conventional lattice body.

[Explanation of symbols]

 1 Expanded Lattice Body 2 Ears 3 Thin Film Made of Pb-Sn Alloy 4 Pb-Ca-Sn Alloy Sheet 5 Strap

Claims (1)

[Claims] 1. A lattice having an ear portion on an upper portion thereof, wherein the ear portion is composed of three layers, and layers on both sides are lead-tin (Pb-).
A lead-acid battery grid that is made of Sn) -based alloy and the surface of these layers is flush with the surface of the grid.