JPH03156856A - Lead storage battery - Google Patents

Abstract

PURPOSE:To increase vibration resistance by specifying the contact area of the upper frame bone of an expanded grid made of a lead-calcium base alloy with a net-shaped grid bone hung down from the upper frame bone in a specified ratio based on the end area along the length of the upper frame bone. CONSTITUTION:The contact area of the upper frame bone 1 of an expanded grid with the expanded grid 2 hung down from the upper frame bone is specified to 50% or more based on the end area along the length of the upper frame bone. This is obtained by adjusting the dimension of the contact part l' of the upper frame bone 1 and the grid bone 2 so as to keep the relation of LX1/2<=nXl'. This adjustment is simply achieved by only the dimensional adjustment of cutting blades, especially the first blade for forming an expanded form. Thereby, vibration resistance is increased.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a lead-acid battery, and its purpose is to improve vibration resistance and extend life performance, especially when used under high vibration conditions. .

2. Description of the Related Art In recent years, lead-acid batteries have been widely used as starting power sources for automobiles due to their low cost and other reasons.

Among them, automotive lead-acid batteries are used for agricultural machinery, construction machinery, and even shovel cars for removing snow in cold regions. These vibration levels are extremely high compared to general passenger cars. Therefore, improving the vibration resistance of lead-acid batteries is an issue that cannot be ignored.

Furthermore, when used for agriculture or snow removal in cold regions, due to seasonal issues, they are often left for long periods outside of the period of use. Furthermore, due to the location where the construction machine is used and the structure of the machine, it is too time consuming to take it apart and replenish water, charge it, etc. many times. Therefore, there is a high demand for a lead-acid battery using an expanded lattice made of a lead-calcium alloy with excellent maintenance-free performance, and this maintenance-free lead-acid battery is now becoming mainstream for these applications.

Among these, automotive lead-acid batteries are originally designed for cars with low vibration, and their vibration resistance is not originally at a very high level. The level is about 4G at most in the vertical direction, which is applied most to the battery. On the other hand, when used for the above purposes, although there is a range, 6
There are some that exceed G and reach up to 7 G. When such extremely high vibrations are applied, the electrode plate using the expanded lead-calcium alloy lattice will crack at the boundary between the lattice upper frame frame part 1 and the active material filling part 2, as shown in Figure 2. Eventually, this part breaks, which is a serious cause of shortening the life of the battery.

Therefore, in conventional expanded grids made of lead-calcium alloys, methods have been developed to increase the thickness of the grid (approximately 20% more than the current thickness), and to reduce the group pressure of the electrode plates inserted in the battery case. Methods have been devised to increase the height of each cell to minimize vibration-induced deflection of the electrode plate group, and efforts have been made mainly to implement and deal with the latter technique.

Problems to be Solved by the Invention However, when the lattice thickness of the expanded lattice body made of a lead-calcium alloy is increased by, for example, 20%, the improvement in the vibration resistance level is shown in FIG. Figure 3 shows the limit level of vibration resistance performance when vertical vibration is applied with a sweep vibration of 1o~35H2, and it is found that the limit level of vibration resistance performance is improved by only about 1G compared to before the improvement. It is not at the level where the problems have been solved.

In addition, when we adopted a method of increasing the group pressure of the electrode plate group, as shown in Figure 3, the vibration resistance level improved by about 215G compared to before the improvement, but polyethylene resin was used as the separator material that makes up the electrode plate group. As you can see, considering this resin and the electrode plate, each has poor elasticity, so the electrode plate group pressure (proportional to the cell-to-cell dimension and electrode group thickness) is high when it is inserted into the battery case cell. When doing so, it is not possible to obtain a contraction effect in the dimension of the electrode plate group in the thickness direction. If an attempt is made to forcefully insert this with excessive force using mechanical equipment, there is a high probability that manufacturing defects such as deformation or clogging of the end plate of the electrode group will occur, resulting in extremely poor productivity.

A problem that must be solved in these conventional techniques is the need to maintain or improve productivity while achieving a high level of vibration resistance.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an upper frame rib of an expanded lattice body made of a lead-lucium alloy, and a rope-like lattice body hanging from the upper frame bone. The present invention is characterized in that the contact surface constitutes an expanded lattice body whose contact surface is larger than sob with respect to the end area along the length direction of the upper frame bone.

Effect The present invention has the above-mentioned structure, so that deterioration such as cracks that occur at the boundary between the upper frame bone and the expanded lattice bone can be prevented even under high vibrations without increasing the plate group pressure. In addition to improving the vibration resistance level, it is possible to create an extremely efficient structure in terms of productivity.

Example An embodiment according to the present invention is shown in FIGS. 4 and 6.

The contact surface between the upper frame bone 1 of the expanded lattice body and the expanded lattice bone 2 hanging down from the upper frame bone is 50 inches or more with respect to the end area along the length direction of the upper frame bone. It is shown in Figure 4. This is the upper frame bone 1 of the expanded lattice.
The dimension of the contact portion l' between the lattice frame 2 and the expanded lattice rib 2 is adjusted so that the relationship LXi≦n×β' is satisfied with respect to the length L of the lattice body. Such dimensional adjustments can be easily made by simply adjusting the dimensions of the cutting blades, especially the first blades, which are not required to form the expanded shape.

By adjusting the dimensions of the contact portion in this way, the effect shown in FIG. 6 can be obtained. This is the result of a vibration test on a 75D31 type lead-acid battery, and shows the vibration limit level according to the ratio of the dimensions of the contact portion between the upper frame rib 1 and the expanded lattice rib 2 of the expanded lattice body under the above conditions.

In FIG. 5, the size ratio of the contact portion to the cross-sectional area of the upper frame tube is 30%, which is the conventional size ratio, and this ratio is successively increased to 40% and 50%.

When changing it to 60%, the shooting limit level was improved,
As the ratio of contact area increases, it improves in proportion to approximately 5
It shows a tendency to remain flat around the 0 section. From this result, by setting the contact surface of the contact part to a ratio of approximately 60 inches or more to that of the upper frame bone, the improvement in vibration resistance by adjusting the contact part dimensions can be maximized. Become.

Effects of the Invention As described above, by adopting the structure of the present invention, the ratio of the dimension of the contact area between the upper frame rib of the expanded lattice body and the expanded lattice bone can be reduced to 50 when mounted on a vehicle subject to extremely high vibrations. % or higher, it is possible to achieve extremely high production efficiency, low cost, and excellent vibration resistance without increasing the plate group pressure, which was a conventional improvement measure, and reducing productivity. In addition, it is possible to provide calcium-maintenance-free lead-acid batteries to markets such as agricultural machinery and construction machinery.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the vibration level limit measured by measuring the vertical vibration of a general passenger car when driving on rough roads, Figure 2 is a diagram showing a typical electrode plate structure, and Figure 3 is a diagram showing the vertical vibration 10 ~3
Figure 4 is a diagram showing the limit state of vibration resistance performance in the sweep of 6 electric currents, Figure 4 is a diagram showing the upper frame portion of the lattice body in the present invention, and Figure 6 is a diagram showing the polar plate structure according to the present invention and the conventional structure. It is a figure which shows the comparison result of the vibration-resistant limit of. 1... Expanded lattice upper frame bone, 2...
... Expanded lattice bones, 3... Expanded lattice ears, L... Lattice width, l'... Dimensional width where the lattice bones are in contact with the upper frame bone.

Claims (1)

[Claims] (1) An electrode plate having an expanded lattice made of a lead-calcium alloy is provided, and the expanded lattice has a contact surface between the upper frame bone and the rope-like lattice bone hanging from the upper frame bone. At least 50% of the end area along the length of the bone
A lead-acid battery characterized by having the above characteristics.