KR20070069498A - Grid for lead-acid battery - Google Patents

Abstract

A grid for a substrate of a lead storage battery is provided to improve an adhesion between active materials and mesh opening surfaces and to prevent a separation of active materials from a mesh body. The grid for a substrate of a lead storage battery includes a mesh body formed of a mesh wire(2) and a mesh opening(3), which are produced by punching a stretched strip, and a rug for collecting currents at a top of the mesh body, wherein a mesh opening surface(21) of the mesh wire(2) is a round surface, not a flat surface. In the grid, the round surface formed on the mesh opening surface(21) of the mesh wire(2) has a shape in which a central portion is protruded or is concaved. Preferably, the mesh wires(2) are positioned in zigzag on a plane different from each other, not on the same plane.

Description

Substrate for pole plate of lead acid battery {Grid for Lead-acid battery}

1 is a front view of a substrate formed by punching strip strips;

2 is a cross-sectional view taken along the line A-A of FIG. 1 in a conventional substrate.

3 is a cross-sectional view taken along the line A-A in FIG. 1 showing various embodiments of the present invention.

4 is a cross-sectional view taken along the line A-A of FIG. 1 in another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: network

2: mesh wire 21: mesh surface 22: surface portion

    201, 202, 203, ... hypocrisy

    211, 212, 213, ...... Primary

3: mesh wood 4: active material layer

5: lug

10 substrate 12 top frame

13: lower frame 14: left frame

15: right frame

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate used for a pole plate of a lead acid battery, and more particularly, to an improvement of a substrate formed by forming a soft plate by perforation.

In general, lead acid batteries used in automobiles and the like are secondary batteries capable of charging and discharging. As the electrolyte, dilute sulfuric acid (H ₂ SO ₄ ) is used, and lead dioxide (PbO ₂ ) is coated on the positive electrode (+) and sea sponge (Pb) is applied on the negative electrode (-) as an active material of the electrode plate. When connected to electricity, the active material of the positive electrode (+) and the negative electrode (-) is changed (discharged) into lead sulfate (PbSO ₄ ), and if the current is flowed from the outside, the lead sulfate is again converted into lead dioxide (+) and It is based on the principle of changing (charging) sea sponges (-). Among them, the positive electrode and the negative electrode are composed of an active material that generates an electrical signal and a substrate supporting the path and the active material of the electrical signal. The performance and capacity of the lead acid battery change according to the weight of the active material. Varies with size The substrate of the lead acid battery not only supports the active material, but also acts as a passage for the current. All over the world, the design of the substrate has been studied as to whether the current can be best integrated while reducing the weight. However, substrate design has been limited due to limited construction.

In general, the substrate manufacturing process of the lead acid battery includes gravity casting, expanded metal forming, and punching.

Gravity casting is a method in which lead is poured into a substrate mold, cooled, and then separated from the mold. The gravity casting method has a large pore in the mesh constituting the substrate, thereby providing a cause of rapid grid corrosion in a lead acid battery. In addition, there is a limited horizontal and vertical mesh pattern in the construction method, and there are disadvantages in that the productivity does not increase due to the difficulty of having to coat the mold periodically to separate the substrate mold from the substrate.

The expanded method is a method of making a substrate by tearing a crimped strip to form a mesh, and thus has a higher productivity than the gravity casting method because a substrate is made according to supply of continuous strips. However, in the expanded method, the mesh of the board provides the diamond pattern in the continuous production situation, and unlike the gravity casting method, since it does not have a left and right frame, it is vulnerable to growth such as an increase in the grid during use. have. In addition, when the wire is twisted or stretched or stretched, the stress is concentrated on the node where the wire meets and the wire is extended, so the node is easily broken at the node part. The part may break first, resulting in short life.

The method developed to compensate for the disadvantages of gravity casting and expanded methods is the stamping and punching method. It forms a substrate by drilling holes in the strip made by crimping or gravity casting. It has left and right frames, which is an advantage of the gravity casting method, and uses the crimp strip used in the expanded method. It is strong in overgrowth and is made by perforation method, so it has the advantage of reducing the stress of the mesh so that the grid node part does not break during the use of the product. However, the problem in the perforation method is that the hole is formed by reciprocating the strip, so that the active material is placed between the holes so that no part is placed on the substrate, and the active material may be separated from the substrate if frequent vibration is applied during the use of the product. The increased frequency of these defects has the drawback of shortening the life of the product. In order to compensate for this problem, conventionally, the active material is thickly coated on both sides of the substrate to cover the substrate, or the paper is attached to the surface of the electrode plate to form the electrode plate. However, coating the active material on both sides of the substrate or pasting paper has the disadvantage of raising the manufacturing cost and worsening the productivity.

Thus, the inventors of the present invention, in the electrode plate made of a conventional perforated substrate, since the cross section of the mesh forming the mesh of the substrate is rectangular, and the mesh surface of the mesh forms a straight wall surface, the active material filled in the mesh cannot be supported so that the active material is separated from each other. Focusing on the fact that it could not be prevented, by forming the mesh surface into a curved surface instead of forming the mesh surface of the mesh into a straight wall surface, the periphery of the active material filled in the mesh wrapped around the projection of the mesh surface or inserted into a concave portion. By strengthening the binding force and forming the mesh surface into a curved surface, the surface area of the mesh surface was increased to improve the bonding force between the active material and the mesh surface.

The present invention further goes beyond forming a mesh in the same plane, but forming neighboring meshes on different planes so that each mesh is zigzag so that the active materials filled in adjacent meshes are connected to each other. Rather, the active material is wrapped around the mesh intersecting with the protruding recessed wire, thereby stiffening the bond between the active material and the net to prevent the active material from being separated from the net. The present invention will now be described with reference to the accompanying drawings. Same as

The substrate 10 used in the present invention is formed by punching a stretched strip (srtrip (long and narrow plate)) by pressing with a press bar. The substrate 10 manufactured by the perforation method having the compressed strip as described above has fewer pores. As shown in the drawing, not only the corrosion resistance of the substrate 10 is improved, but also the stress of the mesh 2 of the substrate 10 is reduced. Moreover, since the compressed strip is used, the thickness of the substrate 10 can be freely adjusted. The present invention made of such a strip, as shown in FIG. 1, forms a substrate 10, which is a mesh 1 consisting of a mesh 2 and a mesh 3 and a lug 5 collecting current. In FIG. 2, the mesh plane 21 of the mesh 2 is not formed in a plane as shown in FIG. 2, but the mesh plane 21 of the mesh 2 is shown in FIG. 3. It is characterized by being formed into this curved surface. The mesh wire 2 here includes the gastric wires 201, 202, 203, ..., and the hard wires 211, 212, 213, .....

In forming the mesh surface 21 of the mesh wire 2 into a curved surface, as illustrated in (a), (b), (c), etc. of FIG. The cross section of the mesh wire 2 including the part 22 can be formed in arbitrary shapes, such as a circle, a rectangle, and an octagon. In addition, as shown in (a) of the accompanying drawings, the central portion may be recessed to form a concave shape.

Furthermore, the present invention does not form the meshes 2, which are the stomach lines 201, 202, 203, ..., arranged up and down on the same plane as the meshes 2 adjacent to each other, but one is popped up. Another feature is that the neighboring meshes 2 are zigzag on different planes, such as coming out and entering one another.

That is, as shown in the accompanying drawings, which are cross-sectional views showing the electrode plate coated with the active material on the substrate of the present invention, as shown in FIG. One side is higher than the other in the group (211, 212, 213, .....) and the other side is lower, i.e., both sides based on each primary (211, 212, 213, ...) It is characterized in that the hypocrisy installed in the installation so as to form a plane different from each other.

When the active material is applied to the substrate of the present invention configured as described above, as shown in FIG. 4, the active material layer 4 surrounds the hard wires 211, 212, 213,... It forms a body with the active material layer filled in.

As described above, the present invention not only has the advantage of the expanded process having a compact structure of the substrate corrosion resistance by punching the compressed strip, but also the substrate of the upper frame is an advantage of the gravity-casting substrate (12) and the lower frame 13 and the left frame 14 and the right (15) to have a frame has the advantage of gravity casting to limit the growth, in particular, the present invention provides a support force of the active material layer (4) In order to ensure that the mesh surface 21 of the mesh wire 2 is not formed as a planar as shown in Figure 2 of the accompanying drawings, it is formed as a curved surface by forming it as shown in FIG. The mesh surface 21 firmly grips the active material layer, thereby greatly improving the phenomenon in which the active material layer is spaced apart from the substrate.

In addition, the present invention has the effect that the active material layer is placed in a zigzag without interposing the neighboring mesh wire on the same plane so that the active material layer filled in the mesh is connected to the neighboring active material layer to be strongly bonded to the substrate.

Claims (6)

In punching the elongated strip to form a substrate (1) consisting of mesh (2) and mesh (3) and a substrate (10) consisting of lugs (4) collecting current on top of the mesh (1). 2) the mesh surface 21 of the lead plate of the lead-acid battery, characterized in that formed in a curved surface, not formed in a flat surface as shown in FIG. The substrate for lead plates of lead-acid batteries according to claim 1, wherein the curved surface formed on the mesh surface (21) of the mesh line (2) has a shape in which a central portion of the mesh surface (21) protrudes. The substrate for pole plates of lead-acid batteries according to claim 1, wherein the curved surface formed on the mesh surface (21) of the mesh (2) has a shape in which the central portion of the mesh surface (21) is recessed. 4. The mesh according to any one of claims 1 to 3, wherein the meshes are not located on the same plane as neighboring meshes, but one is protruded and the other enters, and the neighboring meshes are zigzag in different planes. A substrate for a pole plate of a lead acid battery, characterized in that it is positioned. The substrate for pole plates of lead acid batteries according to claim 4, wherein the meshes which are placed in a zigzag on different planes are upper and lower lines (201, 202, 203, ...). The substrate for lead plates of lead-acid batteries according to claim 4, wherein the meshes which are arranged in a zigzag on different planes are meridians (211, 212, 213, ...) positioned left and right.

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