JPH0322351A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To maintain or improve productivity and obtain high vibration- resistant performance by coating paste on one face or both faces so that the upper end position of the active material paste reaches a half or above of the height size of an expand lattice body upper skeleton or exceeds and completely covers the upper skeleton. CONSTITUTION:Paste is coated on an electrode plate thicker than the lattice thickness so that the upper end position of the active material paste reaches at least a half or above of the height size of an expand lattice body upper skeleton 1 or exceeds and completely covers the upper skeleton 1. The paste is coated thicker than the lattice thickness on one or both sides of the electrode plate. Production efficiency is improved, and the vibration-resistant performance can be improved at a low cost.

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. .

BACKGROUND OF THE INVENTION In recent years, automotive lead-acid batteries have become widely used due to their low cost and other reasons.

Among them, automotive lead-acid batteries are often used for agricultural machinery, construction machinery, and shovel cars for snow removal in cold regions, and these have especially high vibration levels compared to automobiles. Improving the vibration resistance of lead-acid batteries is also an issue that cannot be ignored.

Furthermore, when using these for agriculture or snow removal in cold regions, due to seasonal issues, it may be necessary to leave them for a long time outside of the usage period, or due to the location of construction machinery, etc., and the machine structure, it may be necessary to remove it many times for water replenishment, etc. Considering charging, etc., there is a high demand for canolecium expanded lead-acid batteries with excellent maintenance-free performance, and these maintenance-free lead-acid batteries are now becoming mainstream for these applications.

Among these, automotive lead-acid batteries were originally designed to fit cars with low vibration, and their vibration resistance was not originally at a very high level, as shown in Figure 1, which meets the vibration resistance requirements of cars. The maximum level is about 4G in the vertical direction, which is applied most to the battery. On the other hand, when used for purposes such as those described in item 2, although there is a range, 6
There are some that reach the maximum γG above G. When such extremely high vibrations are applied to the calcium expanded type electrode plate, cracks occur in the active material filled part of the electrode plate lattice upper frame rib 1 and the expanded lattice rib 2, as shown in Figure 2, and eventually cracks occur. It is easy to break and becomes a serious cause of shortening the life of the battery. Therefore, as conventional improvement techniques, there is a method of increasing the grid thickness of the lesium expanded type electrode plate grid (approximately 20 times thicker than the current thickness), and a method of increasing the grid thickness of the electrode plate group inserted in the battery case. Methods have been devised to increase the group pressure in each cell to minimize vibration-induced vibration of the electrode plate group, and the latter technique has mainly been used as a countermeasure.

Problems to be Solved by the Invention However, when the grating thickness of the μsium expanded electrode plate grating is increased by, for example, 20 da, the improvement in vibration resistance is shown in FIG. 3. Figure 3 shows the limit level of vibration resistance performance when vertical vibration is applied in a sweep vibration of 10 to 36 degrees, and it shows that the improvement is only about 1G compared to the improved 1YJ, and it is completely In addition, if we solve the problem and increase the group pressure of the electrode plate group, the vibration resistance level improves by about 2.5G compared to before the improvement, as shown in Figure 3. Polyethylene resin is used as the separator material that makes up the electrode plate group, and as you can see from this resin and the electrode plate, each has poor elasticity. When inserting the plate (proportional to the distance between the plates and the thickness of the plate group) into the battery case cell, the shrinkage effect of the size in the thickness direction of the plate group cannot be obtained, and if you try to insert the plate group with excessive force using mechanical equipment, there is a high probability that the This caused manufacturing defects such as deformation and warping of the end plates of the electrode group, 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 a button on the electrode plate of the expandable method to set the upper end position of the active material paste to at least half the height of the upper frame frame of the expanded lattice body. The electrode plate structure is made by over-pasting from one side or both sides in a scrap-like manner, completely covering the above or beyond the upper frame bone.

Function: Due to the above-described structure, the paste suppresses deterioration such as cracks that occur between the upper frame frame and the expanded lattice frame even in the face of high vibrations without increasing the plate group pressure. It is an extremely efficient structure in terms of productivity as well as improved productivity.

Example Examples according to the present invention are shown in FIGS. 4 to 7.

As described in the section on means for solving the problems, FIG. 4 shows a paste applied to more than half of the height of the upper frame bone 1 of the expanded lattice. The overpaste is thicker than the grid thickness on only one side. By pasting and hardening the boundary between the upper frame bone and the expanded lattice surface where the active material is present, cracking and deterioration of the boundary can be prevented due to vibrations in the vertical direction.

Furthermore, as shown in Fig. 6, if the upper and lower parts of the upper frame bone 1 are solidified in a sandwich-like manner by pasting completely beyond the upper frame bone 1, the effect shown in Fig. 4 will be made even stronger and the boundary portion will be fixed. ,
It looked like it was pressed down.

In the above two methods, one in which only one side is overpasted and the boundary part is fixed, and the other in which both sides are overpasted and the boundary part is fixed are shown in FIGS. 6 and 7.

FIG. 8 shows the level of improvement in vibration resistance when the electrode plates are constructed using the methods shown in FIGS. 4 to 7. Similar to FIG. 3, this represents the vibration resistance performance limit level in 10 to 3617 sweep vibrations in the vertical direction.

Compared to the level 4G before the improvement shown in FIG. 3, all of the structures according to the present invention exceed 4G, and the highest level has an extremely high level of performance of 7.5G. Looking at these trends, it can be seen that the vibration resistance performance of double-sided overpasting is higher than that of single-sided overpasting, and that the vibration resistance performance of double-sided overpasting is higher than that of overpasting on only one side. Comparing this with a structure in which the upper frame bone is completely covered and hidden, and the boundary part is fixed from above and below, it is found that overpaste that is completely covered and hidden beyond the upper frame bone has higher vibration resistance. be.

Based on the above results, when pasting, the electrode plate group pressure can be increased by covering the upper frame bone and pasting from both sides. It is possible to obtain the same extremely high level of vibration resistance. In terms of productivity, which is a problem of the present invention, in the case of the present invention, there is no need to further reduce the electrode group pressure, so the thickness of the separator is adjusted to account for the thicker electrode plate due to the Ohnoyo paste. However, the total thickness of the electrode plate group can be made the same as the thickness before the current improvement, and there is no need to worry about equipment trap μ due to the thickness of the electrode plate group. or,
Regarding the process of overpasting the electrode plate, by increasing the amount of paste during filling and changing the pitch of the thickness adjustment roller, overpaste can be freely applied, and there is no problem with the equipment, and productivity is improved. We can make good batteries.

Effects of the Invention As described above, by adopting the structure of the present invention, when mounted on a vehicle where extremely high vibrations occur, the boundary between the expanded lattice upper frame frame and the expanded lattice body can be reduced. In addition to preventing crack deterioration and breakage phenomena, calcium is extremely efficient, inexpensive, and has excellent vibration resistance, without increasing the plate group pressure and reducing productivity, which was a conventional improvement measure. It is possible to provide maintenance-free lead-acid batteries to markets such as agricultural machinery, construction machinery, and sitable cars for snow removal in cold regions.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the vibration level limit in the range of 5 to 33}Z, measured by measuring the most frequent vibrations in the vertical direction when a general passenger car drives on rough roads, and Figure 2 is the polar plate before improvement. Figure 3 shows the structure of 75D based on two conventional technologies.
Figures 4 to 7 are diagrams illustrating the structure of an expanded electrode plate according to the present invention, which was produced as a prototype using a type 31 battery, and shows the limit state of vibration resistance performance in a sweep of vertical vibration of 1 to 5 Hz. 1... Expanded lattice upper frame bone, 2...
Expanded lattice bones, 3... Expanded lattice ears.

Claims (2)

[Claims] (1) An expanded type electrode plate is provided, and the electrode plate is pasted thicker than the lattice thickness, and the upper end position of the active material paste is at least half the height of the expanded lattice upper frame frame. , or a lead-acid battery characterized by completely covering and covering the upper frame bone. (2) The lead-acid battery according to claim 1, wherein the paste is thicker than the grid thickness on both sides of the electrode plate.