JPS6040140B2 - Storage battery pole sealing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sealing a pole of a storage battery, particularly a sealed storage battery, and a method for extremely easily sealing a pole that extends upwardly through a battery case lid in a liquid-tight and airtight manner. It is characterized by:

Conventionally, sealed storage batteries have been completely sealed except for the safety valve to prevent self-discharge due to oxygen gas flowing into the battery from outside the battery container and to prevent dilute sulfuric acid, which is an electrolyte, from flowing out of the battery container. is required.

Therefore, as shown in FIG. 5, the method for sealing the pole pillar part is to pass the terminal pole pole 3 through the pole pole penetration entrance part 2 provided on the lid 1 and protrude upward, and then use rubber packing or the like. The sealing material 4 is joined to the pole post 3 to cover the gap between the closing part 2 and the pole post 3 from above, and the adhesive 6 is injected into the recess 5 provided to surround the pole post and solidified. As shown in FIG. 6, a method has been adopted in which a highly viscous adhesive 7 is directly injected into the recess 5 and solidified without using a filler 4. However, in the former method, the process is complicated and sealing materials such as rubber packing are used, which reduces the adhesive area between the pole and the lid, resulting in insufficient adhesive strength and the adhesive peeling. There is a problem in that there is a high probability that dilute sulfuric acid, which is an electrolytic solution, will leak.

On the other hand, in the latter method, handling of the adhesive during the sealing process is troublesome, and there is a problem that a sufficient adhesion effect between the adhesive 7 and the pole pillar 3 and the lid 1 cannot be obtained. That is, the adhesive used to fix the storage battery lid and the pole pole has an adhesive mechanism that utilizes an anchoring effect and physical bonding, rather than the generally known chemical bonding. Adhesives with a strong anchoring effect cannot be used as they are because they degrade the synthetic resin of the lid, and for adhesives that use physical bonding, wettability with the adherend is important, and the lower the viscosity, the better the adhesive. It is powerful. Therefore, it is necessary to pay sufficient attention to its selection. However, if you use an adhesive with a low viscosity because you are expecting a strong adhesive force, the entrance part 2 and pole pillar 3 provided on the lid 1 will be damaged.
Excess adhesive leaks into the battery through the gaps between the electrodes and covers the separator or the upper part of the electrode plate group, resulting in problems such as deterioration of the utilization rate of the electrode plates and a decrease in battery capacity.
The present invention solves the problems of such a pole column sealing method,
To provide a pole pillar sealing method that can seal a pole part with good workability.

To describe the present invention in more detail, a cap larger than the pole is provided at the bottom of the recess provided in the lid made of thermoplastic synthetic resin, and after the pole is passed through the pole, the periphery of the cap is inserted. The resin is heated and melted using a heating jig, etc., and this molten resin closes the gap between the pole pillar and the entrance part, and further covers the outside of the molten resin and the end of the pole pillar that protrudes upward to seal them. This is a method for sealing storage battery poles by filling the recesses with adhesive.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sealed storage battery in which the poles are sealed using the pole-column sealing method according to an embodiment of the present invention, in which 8 is a battery case made of thermoplastic synthetic resin and is welded to the lid 1, and 9 is a pole. This is a group of boards. In order to seal the pole column 3 to the lid, the sealing process shown in FIGS. 2 to 4 is performed.

That is, a lid 1 made of thermoplastic synthetic resin is provided with an opening 2 having a diameter d' that is 1 to 2 degrees larger than the diameter d of the pole post 3, and an annular rib 10 is provided around the periphery of this closed portion. The thickness t' is 1.5 to 2 times thicker than the average thickness t. From this state shown in FIG. 2, the heated metal cylindrical welding jig 11 is pushed down to heat and melt the annular rib 10.

The inner surface of the tip of the jig 11 has a taper of 30 to 450 degrees and becomes sharper toward the tip, and when the rib 10 is placed on the rib and heated, the rib 10 melts and deforms according to the shape of the tip of the jig. , is brought into close contact with the pole pillar 3. A cylindrical space 12 having a diameter d'' larger than the diameter d of the pole column is formed in the jig 11 to accommodate the upper part of the pole column.After this state shown in FIG. 3, Remove the jig 11, weld the external lead-out terminal piece 13 to the upper end of the pole post 3, and then fill the recess 5 with the permeable adhesive 7 to cover the outer surface of the welded rib 10. The pole part can be sealed without leaking into the battery through the gap between the pole pole 3 and the gate part 2.

The feature of the pole column sealing method of the present invention is that it does not use any sealing material such as rubber packing, and the periphery of the closing part provided on the lid is heated and melted, and the molten resin is used to fill the gap between the pole column and the closing part. The purpose is to block the In other words, the green resin around the opening of the lid is heated and melted by the heating jig and caused to flow toward the pole column, but the pole column is thermally at a much lower temperature than the jig, so it flows. The molten resin cools and solidifies when it comes into contact with the pole pillars, and can close the gap without flowing into the battery. Therefore, the gap between the pole pole and the entrance can be closed much more easily than before, and even if the recess is filled with adhesive, the gap between the pole pole and the opening is closed, so it can be glued into the lightning tank. The pole part can be sealed without the agent dripping. Brief explanation of the drawings: Figure 1 is a sectional view showing a sealed storage battery in which the pole part is sealed in an embodiment of the present invention, and Figures 2 to 4 are sectional views of essential parts showing the process of sealing the pole part. FIGS. 5 and 6 are cross-sectional views showing a pole-column sealing structure in a conventional storage battery.

DESCRIPTION OF SYMBOLS 1... Lid made of thermoplastic synthetic resin, 2... Opening section, 3... Pole column, 5... Hollow, 7... Adhesive, 1
0... Rib, 11... Heat welding jig.

Figure 5 Figure 6 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. An opening larger than the pole is provided at the bottom of the recess provided in the lid made of thermoplastic synthetic resin, and after the pole is passed through the opening, the resin around the periphery of the opening is is heated and melted, and the gap between the pole column and the opening is closed with this molten resin.
A method for sealing a pole of a storage battery, further comprising filling the recess with an adhesive to seal the pole. 2. The method for sealing a pole column of a storage battery according to claim 1, wherein an annular rib that stands up upward is provided on the periphery of the opening provided in the lid.