JP2682225B2 - Lattice body for lead-acid battery electrode plate and method for manufacturing electrode plate - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid for a lead storage battery electrode plate and a method for manufacturing a lead storage battery electrode plate using this grid.

2. Description of the Related Art A grid for a lead storage battery electrode plate is composed of a lead frame or a lead alloy outer frame and an inner frame. As shown in the cross section in FIG. 4, the inner bone 1 in the lateral direction is located at the center of the outer peripheral frame bone 2 in the wall thickness direction, and the acute-angled portions 3 in the cross-sectional shape are opposite to each other between adjacent inner bones. Facing the plane. With such a structure, the retention of the active material filled in the lattice is ensured.

However, the strength of the lattice body is decreasing as the thickness of the lattice body is reduced, and the inner bone 1 is deformed by the pressure applied when the lattice body is filled with the active material paste, and the inner bone 1 is deformed. Is pushed down to. As a result, as shown in FIG.
The inner bones are partially exposed on the surface of the electrode plate without sufficiently wrapping around to the back side of the above, and a gap 5 is formed between the inner bones 1 and the filled active material paste 4.

In such an electrode plate, since the inner bone 1 is unevenly distributed in the center of the active material layer, the electrode plate is curved during formation, and the reaction distribution of the active material becomes non-uniform even during battery use. As a result, the charge / discharge cycle life becomes short.

The problem to be solved by the present invention is to prevent the inner bone from being unevenly distributed to one surface side in the active material layer when the active material paste is filled in the lattice.

Means for Solving the Problems In the lattice body according to the present invention, the lateral inner bone is located at the center in the thickness direction of the outer peripheral frame bone at the connection portion with the outer peripheral frame bone, and the center line of the lattice body It is characterized in that it is provided in an arch shape so as to be convex.

This grid is filled with the active material paste from the side where the inner bones are convex.

Operation In the lattice body according to the present invention, since the internal bone has an arched shape in which the internal bone is convex on the center line of the lattice body which is most deformed under the pressure when the active material paste is filled, the internal bone is not deformed. Stops halfway without reaching the other side. And
The filled pace wraps around to the back of the inner bone.

Example FIG. 1 shows a plan view and a sectional view of a lattice. (B)
FIG. 3A is a cross-sectional view taken along line bb ′ in (a), in which the inner bone 1 in the lateral direction is connected to the outer peripheral frame bone 2 at the outer peripheral frame bone 2;
Is located at the center in the thickness direction of the and has an arched shape that is convex on the center line along the line bb '. (C),
(D) is the cc ′ line and d− in (a), respectively.
It is a cross-sectional view taken along the line d ′, and shows that the inner bone 1 is not located at the center of the frame bone 2 in the thickness direction on the center line but is unevenly distributed on the surface side. The size of the grid is 87 mm long,
The width is 59 mm and the thickness of the frame bone 2 is 1.2 mm.

FIG. 2 shows a state in which the lattice material is filled with the active material paste 4 from the side where the inner bones 1 are convex. The inner bone 1 is deformed by the paste filling pressure and the whole is located in the center of the active material layer. When this electrode plate was formed, the reaction distribution was uniform because the inner bone 1 was in the center of the active material layer, and the electrode plate was not curved.

FIG. 3 shows the results of a lead-acid battery assembled using the electrode plate of the example and the conventional electrode plate shown in FIG. 5 and a charge-discharge cycle life test conducted. The batteries are all 2V-1.6Ah type. The charging / discharging conditions are as follows.

Charging condition 2.45V constant voltage, limiting current 0.3cA charging time 5 hours Discharging condition 0.25cA constant current discharge end voltage 1.7V In the example, it can be seen that the charging / discharging reaction is performed uniformly and the life is extended.

As described above, in the production of the electrode plate using the lattice according to the present invention, the inner bones of the lattice are not exposed on the electrode plate surface and are retained in the active material layer, so that the reaction of the active material A uniform distribution can be used for the electrode plate. As a result, a lead storage battery having a long charge / discharge cycle life can be obtained.

[Brief description of the drawings]

FIG. 1 shows a lattice body of an embodiment according to the present invention, (a) is a plan view, (b) is a sectional view taken along line bb 'of (a),
(C) is a sectional view taken along the line cc ', and (d) is the same d-.
FIG. 2 is a sectional view taken along line d ', FIG. 2 is a sectional view showing a state in which the grid material is filled with an active material paste, FIG. 3 is a curve diagram showing the results of a charge / discharge cycle life test, and FIG. 4 is a conventional grid. FIG. 5 is a sectional view of the body, and FIG. 5 is a sectional view showing a state in which the active material paste is filled in the lattice body. 1 is internal bone, 2 is frame bone, 4 is active material paste

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-114451 (JP, A) JP-A-63-160168 (JP, A)

Claims (2)

(57) [Claims] 1. A lattice body made of lead or lead alloy outer peripheral frame bone and inner bone, wherein the lateral inner bone is located at the center in the thickness direction of the outer peripheral frame bone at the connecting portion with the outer peripheral frame bone. The lead-acid battery lattice is characterized in that it is provided in an arch shape so as to be convex at the center line of the lattice. 2. A lateral inner bone of a lattice body made of lead or lead alloy outer frame and inner bone is located at the center in the thickness direction of the outer frame at the connecting portion with the outer frame. , The arch is provided so as to be convex on the center line of the lattice, and the lattice is filled with the active material paste from the side where the internal bone is convex, and the entire internal bone is covered with the active material layer. A method for manufacturing a lead storage battery electrode plate, which is characterized in that it is located in the center.