JP2982554B2 - Lead storage battery - Google Patents

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 electrode plate thereof, which is suitable for an electrode plate using a lead alloy lattice obtained by a continuous casting method.

[0002]

2. Description of the Related Art Generally, an electrode plate used for a lead-acid battery is:
A lead alloy lattice as shown in FIG. 6 is cast by a pair of split molds engraving the lattice shape (book mold casting).
Then, this lattice body is filled with a paste-like active material kneaded with lead oxide, sulfuric acid and water as main components, and is manufactured through a ripening and drying process. FIG. 7 shows a cross section of this electrode plate. There are a frame bone 1 forming the outer shape of the electrode plate and an inner bone 2 thinner than the frame bone 1, and the inner bone 2 is a frame bone. 1 in the center in the thickness direction. The filling of the paste-like active material is performed by filling the lead alloy lattice placed on a flat belt so that the paste-like active material is pressed down from above, and then molding by a brush or the like. Since the active material 3 is located at the center in the thickness direction of the frame bone 1, the active material 3 is uniformly held on both surfaces of the inner bone 2. On the other hand, for the purpose of cost reduction, it has been proposed to manufacture a lead alloy lattice by a continuous casting method. For example, a drum in which a grid shape is engraved on the peripheral surface is rotated, a molten metal of a lead alloy is injected at a predetermined position, and a section until the molten metal is solidified covers the drum peripheral surface by an appropriate means. In such a continuous casting method, the cross-sectional shape of the manufactured lead alloy lattice is usually as shown in FIG. That is, the inner bone 2 having a thickness smaller than that of the frame bone 1 is arranged to be offset to one side in the thickness direction of the frame bone 1. When such a lead alloy lattice is filled with the paste-like active material, the active material is not sufficiently held on the surface opposite to the surface on which the inner bone 2 is biased, and easily falls off. As a result, the battery life is shortened and reliability is poor.

[0003]

An object of the present invention is to provide a lead alloy lattice in which an inner bone thinner than a frame bone is arranged on one side in the thickness direction of the frame bone. It is an object of the present invention to secure the battery life by preventing the active material from falling off in the electrode plate having the body holding the active material.

[0004]

In order to solve the above-mentioned problems, a lead-acid battery according to the present invention comprises inner bones 102, 202 having a thickness smaller than that of the frame bones 101, 201.
Is characterized in that an electrode plate filled with an active material 3 is provided by superimposing two lead alloy lattices which are arranged offset on one side in the thickness direction. There are various types of superposition of the two lead alloy lattices,
2 (see FIGS. 1 and 2) with inner surfaces 102 and 2 of two lead alloy lattices
02 (see FIG. 2), inner bone 10
A superposition (see FIG. 3) in which the side on which the 2,202 is biased is on the outside can be performed. At least a part of the superposed surface of the two lead alloy lattices may be formed to be flat and closely adhered. Further, two lead alloy lattices having different alloy compositions may be used.
For example, the alloy composition of one lead alloy lattice is a Pb-Sb alloy, and the alloy composition of the other lead alloy lattice is a Pb-Ca alloy.

[0005]

In the lead storage battery according to the present invention, two lead alloy lattices are stacked and the paste-like active material is filled like a single lattice, so that the inner bone is in the thickness direction of the frame bone. Is placed at the center or both surfaces, and the active material can be held well. At the same time, the two lead alloy lattices are integrated by the filled active material. If the superposed surfaces of the two lead alloy lattices are formed flat and are brought into close contact with each other, the superposition is stabilized. If the alloy compositions of the two lead alloy lattices are different, a lead-acid battery having battery characteristics unique to each alloy composition can be obtained. When two lead alloy grids are superimposed, the thickness of the electrode plate becomes thicker as it is, but according to the continuous casting method, a thin lead alloy grid that cannot be obtained by book mold casting can be cast. Therefore, a lead alloy lattice having a thickness of half the normal thickness is manufactured by a continuous casting method, and by stacking two of them, an electrode plate having the same thickness as the conventional electrode plate can be obtained.

[0006]

【Example】

Example 1 (see FIG. 1) By the continuous casting method, the thickness of the frame bones 101 and 201 is set to 0.
A lead alloy (Pb-1.5% Sb) lattice body having a thickness of 75 mm and a thickness of 0.75 mm for the inner bones 102 and 202 is manufactured. The inner bone is
It is located on one side in the thickness direction of the frame bone, and on the side on which the frame bone is offset, the surfaces of the frame bone and the inner bone are flat and flush with each other. The bones have a triangular cross-section, with each base lying on the same plane.) Two such lattices are superimposed with the side on which the inner bone is biased inward. The overlapping surface is flat because both the frame bone and the inner bone are flat, and the thickness of the frame bone is 1.5 mm and the thickness of the inner bone is 1.0 mm. It is configured like a single lattice. The grid body was filled with a paste-like active material to form an anode plate, which was combined with a cathode plate manufactured by a conventional method to form a 55D23 type lead storage battery. In this embodiment, the entire surface of the superimposed surface of the two lattices is flattened so as to be on the same plane. Can be performed stably.

Embodiment 2 (see FIG. 2) The superposition of two lattices is the same as in Embodiment 1,
The inner bones 102 and 202 do not overlap, and each functions independently as an inner bone in a displaced arrangement. Frame bone 10
Numerals 1,201 are in close contact with each other on the overlapping surface and function as one frame bone. Hereinafter, a lead storage battery was formed in the same manner as in Example 1.

Embodiment 3 (See FIG. 3) Two lattices are superposed with the side on which the inner bone is biased outward. The frame bones 101 and 201 are in close contact with each other on the overlapping surface, and form one frame bone. Inner bone 10
Although they overlap, they do not adhere to each other, and a gap is formed between them. On both surfaces of the superimposed lattice body, the frame bone and the inner bone are located on the same plane. Hereinafter, a lead storage battery was formed in the same manner as in Example 1.

Example 4 In Example 1, the composition of one of the lead alloys in the superposed lattice was Pb-1.5% Sb, and the composition of the other lead alloy was Pb-
It was set to 0.1% Ca.

Conventional example (see FIG. 5) Grid body (lead alloy composition: Pb-1.5) by a continuous casting method
% Sb, thickness of the frame bone: 1.5 mm, thickness of the inner bone: 1.0 mm, and the inner bone 2 is arranged on one side in the thickness direction of the frame bone 1) to form an anode plate. Hereinafter, it is similar to the first embodiment.

Comparative Example (See FIGS. 6 and 7) A grid body (lead alloy composition: P
b-1.5% Sb, frame bone thickness: 1.5 mm, internal bone thickness:
The anode plate was constructed using 1.0 mm, and the inner bone was disposed at the center in the thickness direction of the frame bone. Hereinafter, it is similar to the first embodiment.

Each of the lead storage batteries of the above embodiment, conventional example and comparative example was subjected to a 75 ° C. light load life test (SAE life test). As shown in FIG. 4, the lead-acid batteries of Examples 1 to 3 have a life of 3500 cycles or more compared to the life of the lead-acid battery of Conventional Example 2 for 1600 cycles of charge and discharge. It is equal to or longer than the life of the lead-acid battery of the comparative example using the grid body cast by the method. Further, the lead storage battery of Example 4 in which the alloy compositions of the two lattices were different had a life of 4000 cycles or more, and a great effect was obtained.

[0013]

As described above, the lead storage battery according to the present invention has a lead alloy lattice body in which an inner bone thinner than a frame bone is arranged on one side in the thickness direction of the frame bone. , The life performance can be ensured. The usefulness of the present invention is high in that a lead alloy lattice by a continuous casting method, which is inexpensive to manufacture, can be employed without concern about life performance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electrode plate in a lead storage battery according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of an electrode plate in a lead storage battery according to another embodiment of the present invention.

FIG. 3 is a sectional view of a main part of an electrode plate in a lead-acid battery according to still another embodiment of the present invention.

FIG. 4 is a curve diagram showing a result of a life test of a lead storage battery.

FIG. 5 is a sectional view of a main part of an electrode plate using a conventional grid body by a continuous casting method.

FIG. 6 is a plan view of a lattice body formed by book mold casting.

7 is a cross-sectional view of a main part of an electrode plate of a comparative example using the lattice body of FIG. 6;

[Explanation of symbols]

 101 and 201 are frame bones 102 and 202 are inner bones 3 are active materials

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01M 4/73 H01M 4/68 H01M 4/14

Claims (6)

(57) [Claims] 1. An electrode plate comprising two lead alloy lattices superposed on each other and filled with an active material, wherein the lead alloy lattice has an inner bone thinner than its frame bone. Characterized in that the two lead alloy lattices are superposed on one side in the thickness direction of the bone, and the superposition of the two lead alloy lattices is performed with the surface on the side where the internal bone is deviated inside. Lead-acid battery. 2. The two lead alloy lattices are superimposed on each other.
The lead alloy lattice body has an inner bone having a thickness smaller than that of the frame bone.
It is arranged offset to one side of the thickness direction of the bone, characterized in that said two superposition of lead alloy grid have been conducted a surface on the side that is offset inner bone on the outside When
Lead-acid batteries to be. 3. The lead-acid battery according to claim 1, wherein the positions of the inner bones of the two lead alloy lattices are shifted when they are superposed. 4. according to any one of claims 1 to 3 overlapping surfaces of the two lead alloy grid is characterized by being configured to at least partly formed flat contact Lead-acid battery. 5. The two lead alloy grid is a lead acid battery according to any one of claims 1 to 4, characterized in that the alloy composition is different. 6. The alloy of one of the lead alloy lattices has a Pb-S alloy composition.
The alloy composition of the b-based alloy and the other lead alloy lattice is Pb-Ca
The lead-acid battery according to claim 5, wherein the lead-acid battery is a system alloy.