JP3317965B2 - Lead storage battery - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery, and more particularly to an improvement in vibration resistance and an improvement in life performance, especially for use under high vibration. .

2. Description of the Related Art In recent years, lead-acid batteries for automobiles have been widely used for reasons such as low cost.

Above all, lead-acid batteries for automobiles are often used for agricultural machinery, construction machinery, and even shovel cars for snow removal in cold regions, and these are extremely high compared to the vibration level of automobiles. The improvement of the anti-vibration performance of the lead storage battery is a problem that cannot be ignored.

Furthermore, when used for agriculture and snow removal in cold regions, etc., due to seasonal problems, considering long-term storage outside of the use period, or using the construction machinery, etc., or removing it many times due to its mechanical structure, Considering charging and the like, there is a high demand for an expandable lead-acid battery using a lead-calcium alloy having excellent maintenance-free performance, and this maintenance-free lead-acid battery is now becoming the mainstream for these applications.

Of these, lead-acid batteries for automobiles are originally designed for low-vibration automobiles, and the level of anti-vibration performance is not so high from the beginning, as shown in Fig. 1, the required level of anti-vibration performance of automobiles. Is about 4G at most in the vertical direction of the battery. On the other hand, when used for the above-mentioned applications, there are some that have a width of 5G or more but have a maximum of 7G. When such an extremely high vibration is applied, the expanded electrode plate cracks in the active material-filled portion of the upper grid bone 1 and the expanded grid bone 2 as shown in FIG. It will break and become a serious cause of shortening the life of the battery. Therefore, as a conventional improvement technique, a method of increasing the grid thickness of the electrode plate (up by about 20% from the current thickness) or a group pressure of the electrode group inserted in the battery case is applied to each cell. A method has been devised to raise the height and minimize the deflection due to the vibration of the electrode group, and the implementation and response have been mainly measured by the latter technology.

Problems to be Solved by the Invention As an example, FIG. 3 shows how the vibration resistance level is improved when the grid thickness of the electrode plate is increased by 20%. Third
The figure shows the limit level of anti-vibration performance when a vertical vibration of 10 to 35 Hz sweep vibration is performed, and only about 1 G is improved compared to before the improvement, which is a complete problem It is not the level that solved.

When the method of increasing the group pressure of the electrode group is adopted, as shown in FIG. 3, compared with the state before the improvement, the vibration resistance level is improved by about 2.5G, but polyethylene resin is used as a separator material constituting the electrode group. As can be seen when considering this resin and electrode plates, each has poor elasticity, so a high electrode plate group pressure (proportional to the battery cell size and electrode plate group thickness) is applied to the battery cell. When inserting, the shrinkage action in the electrode group thickness direction is not obtained, and if you try to insert it with excessive force with mechanical equipment, there is a high probability that the electrode plate end plate is deformed, that is, manufacturing defects such as And extremely low productivity.

As a problem to be solved in these conventional techniques, it is necessary to obtain a high level of vibration resistance while maintaining or improving productivity.

Means for Solving the Problems The present invention, in order to solve the above problems, the upper end position of the active material paste in an expanded electrode plate, one side or so as to completely cover over the upper frame bone of the expanded lattice. It has an electrode plate structure with both sides over-pasted.

Effect The present invention has the above-described configuration, and the paste suppresses deterioration of cracks and the like generated between the upper frame bone and the expanded lattice bone even with high vibration without increasing the electrode plate group pressure, thereby improving the vibration resistance level. The structure is extremely efficient as well as the productivity is improved.

Embodiment An embodiment according to the present invention is shown in FIGS. 5 and 7, and a reference embodiment is shown in FIGS. 4 and 6. FIG. The reference example shown in FIG. 4 is obtained by pasting more than half the height of the upper frame 1 of the expanded lattice. Only one side is over-pasted thicker than the grid thickness. By pasting and solidifying the boundary between the upper frame bone and the expanded lattice surface where the active material is present, crack deterioration of the boundary at vertical vibration can be prevented.

In the present invention, as shown in FIG. 5, by completely pasting the upper frame bone, the boundary portion is further fixed and pressed as compared with the reference example shown in FIG. 4 by pasting. is there.

FIGS. 6 and 7 show the above two methods, in which only one side is over-pasted and the boundary is fixed, whereas both sides are over-pasted and the boundary is fixed.

The electrode plates were constructed by the methods shown in FIGS. 4 to 7, and the limit level of the vibration-proof performance in a 10-35 Hz sweep vibration in the vertical direction was confirmed.

Compared to FIG. 3, the structure according to the present invention all exceeds 4G, compared to the level 4G before the improvement. At the highest level, a very high level of performance of 7.5G is obtained. Looking at these trends, the performance of the double-sided overpaste is higher than the vibration resistance of the single-sided overpaste, respectively, and the over-paste is more than half the height of the expanded lattice upper frame bone. Compared to a structure that completely covers over the upper frame bone and fixes the boundary part from above and below, the vibration resistance performance is higher when the overpaste is completely covered beyond the upper frame bone. is there.

According to the above results, when applying the paste, by covering over the upper frame bone, and by further over-paste from both sides, the same as the one that has been carried out as the prior art, increased electrode plate group pressure An extremely high level of vibration resistance can be obtained. In view of the productivity which is the subject of the present invention, in the case of the present invention, it is not necessary to increase the electrode group pressure, so that the electrode thickness is increased by the overpaste,
The thickness of the electrode group may be adjusted to make the total thickness of the electrode group the same as that before the current improvement, and there is no need to worry about any equipment trouble due to the thickness of the electrode group. In addition, in the process of over-pasting the electrode plate, the over-paste can be freely performed by increasing the amount of paste at the time of filling and changing the pitch of the thickness adjusting roller. A good battery can be made.

Effect of the Invention As described above, with the configuration according to the present invention, under the condition that a vehicle is subjected to extremely high vibration, crack deterioration or fracture at the boundary between the expanded lattice upper frame bone and the expanded lattice body is achieved. This is a calcium-maintenance-free lead that is extremely efficient and inexpensive with excellent anti-vibration performance, without preventing the phenomenon and improving productivity by increasing the electrode plate group pressure, which was a conventional improvement measure. The storage battery can be provided to markets such as shovel cars for agricultural machines, construction machines, or for removing snow in cold regions.

[Brief description of the drawings]

Fig. 1 is a diagram showing the maximum vertical vibration measured on a rough road of a general passenger car, and shows the vibration level limit in the range of 5 to 33Hz. Fig. 2 shows the electrode structure before improvement. FIG. 3 is a diagram showing a prototype of a 75D31 type battery based on the two prior arts, showing the limit state of vibration proof performance in a sweep of a vertical vibration of 10 to 35 Hz, and FIGS. FIG. 3 is a view showing a structure of an expanded electrode plate according to the present invention. 1 ... expanded lattice upper frame bone, 2 ... expanded lattice bone, 3 ... expanded lattice ear.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shoji Karasawa 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-57-15362 (JP, A) JP-A-59- 157952 (JP, A) JP-A-54-154040 (JP, A) JP-A-53-14335 (JP, A) JP-A-64-6373 (JP, A)

Claims (2)

(57) [Claims] An electrode plate of an expanding system is provided, wherein said electrode plate is pasted even thicker than the grid thickness, and the upper end position of the active material paste completely covers over the upper frame bone of the expanded grid body. A lead-acid battery characterized by being hidden. 2. The method according to claim 1, wherein both sides of the electrode plate are covered with the active material paste in a thickness exceeding the grid thickness.
The lead storage battery according to the item.