JPH04171666A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To obtain a battery having no buckling and high reliability by providing a grid having part of intermediate support bones located on the same plane as at least one of both the surface and back principal planes. CONSTITUTION:A lead alloy-cast grid, which is constituted of big frame bones 1 forming the outer periphery of an electrode plate, fine middle bones 2 intruded to the inside in the thickness direction of the electrode plate from one of both the surface and back principal planes as the electrode plate formed by the frame bones 1, and intermediate support bones 3 bigger than the middle bones 2, is used. The middle bones 2 are invariably floated from the principal plane of a belt and a lattice by the intermediate support bones 3, wide paste is fully intruded and distributed on the back face of the middle bones 2, thus buckling is prevented. The buckling trouble of the electrode plate is reduced, and the reliability of a lead-acid battery is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to lead-acid batteries, and in particular provides a paste plate that is less likely to deform during use by improving the plate grid;
This is a more reliable version of lead-acid batteries.

Conventional technology For lead-acid batteries, a paste mainly composed of lead oxide, sulfuric acid, and water is applied to a grid made of shipboard metal cast in a lattice shape and dried, and this is often used in combination with a separator. .

At this time, the grid is generally made of a thick frame bone that makes up the outer shape of the electrode plate, and a thin frame that is provided at a position slightly moved inward in the thickness direction of the electrode plate from both the front and back main surfaces of the electrode plate formed by the frame bones. It is usually composed of a central bone. The paste is placed flat on a water-absorbent mat-like belt, pressed down from above, and finished by scraping off the top surface with a wiper or the like.

The reason why the backbone is moved slightly in the direction of the thickness of the electrode plate in this way is to ensure that the paste fills both sides of the thin backbone as evenly as possible and that the backbone is sufficiently covered with paste. be. If this basic configuration was used for many years, there would be no practical problems. However, in recent years, serious problems have begun to occur.

The problem that the invention aims to solve is the frequent occurrence of a phenomenon in which the electrode plate is greatly bent during use of the battery, and the etching of the electrode plate breaks the separator, causing a short circuit and shortening the battery life. This is due to the fact that with the recent increase in the electrical load of automobiles and the rise in temperature under the bonnet, there is a tendency to apply relatively hard pastes to make the electrode plates resistant to heavy load discharge. This prevents uniform distribution of the active material to both sides of the backbone when filling the paste,
This is the cause of the large curvature. In other words, the active material, especially in the positive electrode, tends to gradually expand during use.
Its force is strong enough to destroy a sturdy plastic battery case. If such force imbalance occurs due to an imbalance in the paste filling on the front and back sides of the electrode plate, the electrode plate will easily become curved. This trend is also increasing due to the recent heavy use of thin plastic sheet separators.

In particular, in recent years, the use of so-called hybrid batteries has increased, in which the negative electrode uses a lead alloy lattice that does not contain antimony, which generates less hydrogen, and the positive electrode uses a lead alloy lattice that contains antimony, with the aim of making them maintenance-free. Batteries tend to use the above-mentioned thin separators frequently.

The above problems cannot be solved simply by making the backbone thicker. Also, if the paste is changed to a conventional softer paste, the curvature will be reduced, but the active material itself will be damaged and the lifespan will be shortened, so the paste must have an appropriate viscosity.

The present invention aims to solve the problem of short lifespan due to the curvature of electrode plates, which has been increasing due to new trends in applications in recent years, as described above, and is intended to solve the problem of short lifespan due to the curvature of electrode plates. The aim is to provide a grid that can be filled with uniformity (paste filling).

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a thick frame bone forming the outer periphery of the electrode plate and either one of the front and back principal surfaces of the electrode plate formed by the frame bone. It is characterized by the use of a lead alloy cast grid consisting of a thin backbone inserted from one main surface into the inside of the electrode plate in the thickness direction, and an intermediate support bone that is thicker than the above-mentioned backbone, and is highly reliable with no curvature. It gives you a battery of power.

Function Since the present invention has such a structure, the backbone is always suspended from the main surface of the belt lattice by the intermediate supporting bones, so even if paste has a wide range of properties, the paste can be sufficiently penetrated into the back surface of the backside of the backbone and distributed. As a result, bending can be prevented. Furthermore, the support bone of the present invention is not just a reinforcing material, as can be seen from the fact that the bending force is not so small that it can be prevented by slight reinforcement, as already mentioned. In addition, the concept of the conventional backbone is that it is necessary to penetrate the paste into the back side of the backbone, so it is placed on the heald side of the backbone compared to the conventional backbone, and the active material is placed only there. Hard to get around to the back,
In addition, the idea of intentionally creating a part that does not rotate goes beyond the conventional idea, and is different from the idea of thickening some of the middle ribs for reinforcement. Deflects due to paste pressure during filling,
This has succeeded in solving the problem of non-uniformity in the amount of filling on the front and back sides of the backbone, which causes severe curvature of the electrode plate and shortens its lifespan.

EXAMPLES Hereinafter, the features and effects of the configuration of the present invention will be described using examples.

FIG. 1 is an example of a plan view of a grid to which the present invention is applied. 1 is a thick frame bone, 2 is a thin middle bone, 3 is an intermediate support bone of the present invention, and 4 is an ear. FIG. 2 shows an example in which the distance between the intermediate supporting bones is narrower as the electrode plate approaches the ear. FIG. 3 shows an example of a configuration in which the intermediate support bone does not directly contact any of the frame bones. FIG. 4 is a sectional view of the electrode plate, showing the positional relationship in the thickness direction of the container tube. L1 is one main surface of the frame bone, which in this case becomes the surface in contact with the belt when filling with paste□. L2 is the position closest to the bipedal main surface L1 of the midbone and is the outer end position of the midbone. As before, this position is located further inward in the thickness direction than Ll. L3 is the position closest to the above-mentioned surface of the intermediate support bone and is the outer end position of the support bone. L3 is L2 as much as possible
Therefore, the configuration is such that it is located between Ll and L2 or approximately coincides with T, 1. The thickness of the support bone on the side opposite to the heald contact surface does not necessarily have to be the same.

Further, the supporting bone does not require L3 for the entire tube, and may have a rod-like structure with a convex portion provided at an arbitrary position as shown in FIG. On the other hand, it is wise to shift the center of the middle bone to the side opposite to Ll from the center of the frame bone in advance. Note that it is desirable that the middle bone reach the supporting bone or frame bone within at least 50 mm.

Now, the present invention, which has the configuration as described in item 1, makes it possible to sufficiently distribute the paste to the back side, and even if a hard paste that is resistant to heavy loads is applied, it can be uniformly filled, so there is no need for much explanation. The following experiment was conducted to further clarify the effect on curvature in actual use. First, as this example, the first
The combination of the configuration in the figure and the configuration in Figure 4 (2) is A.
The configuration of the figure and the combination of Fig. 4 (2) are designated as B, and C is a lattice containing 2.5% antimony consisting only of frame bones and backbones in which the thickness of the backbone of this example is doubled. A lead-calcium alloy lattice plate was used as the positive electrode, and a lead-calcium alloy lattice plate wrapped in a polyethylene sheet was used as the negative electrode, and 10 bus batteries each were made as a hybrid battery, with a nominal capacity of 5.
0% discharge and 120% charge after discharge in an environment of 70 degrees Celsius (examined repeatedly).

The results are shown in FIG. In the conventional configuration C, trouble occurred after 100 to 200 cycles, even though the backbone was made thicker. The cause of this was a breakage short circuit of the separator due to curvature. On the other hand, A and B of the present invention are 300
It remained normal after rotation, and a disassembly investigation revealed that the bending was extremely slight.

Effects of the Invention As is clear from the above description, the present invention can uniformly fill the paste on both sides of the grid, reduce the problem of bending of the electrode plates, which has been increasing in recent years, and greatly improve the reliability of lead-acid batteries. , its industrial value is extremely large.

[Brief explanation of drawings]

1 to 3 are plan views of grids according to embodiments of the present invention,
4 and 5 are sectional views thereof, and FIG. 6 is a diagram showing its life characteristics. 1...Frame bone, 2...Middle bone, 3...
...Intermediate supporting bone, 4...Ear, Ll...
Circumscribed surface, L2... Outer end position of middle bone, L3...
...The outer end position of the supporting bone. Name of agent: Patent attorney Haruaki Ogata and 2 others”””’
;]]I:: 3-Koma Yasu44-ear 0"■mz'= I;

Claims (1)

[Scope of Claims] (1) Thick frame ribs that form the outer periphery of the electrode plate, and the thickness direction of the electrode plate from either one of the front and back main surfaces of the electrode plate formed by this frame bone. It has a thin midrib extending inside the midrib and an intermediate support bone that is thicker than the midrib, and a portion of the intermediate support bone is attached to at least one of the front and back main surfaces formed by the frame bone. A lead-acid battery with a grid flush with the main surface. (2) The lead-acid battery according to claim 1, wherein the backbone reaches either the frame bone or the intermediate support bone within 50 mm of its circumference. (3) The lead-acid battery according to claim 1, wherein a plurality of the intermediate support bones are provided, and the intervals are narrower as the distance between the intermediate support bones approaches the electrode plate lugs provided on the frame bones. (4) The lead-acid battery according to claim 1, wherein the intermediate support bone is provided so as not to be in direct contact with the frame bone.