JP3575282B2 - How to seal storage battery poles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sealing a pole of a storage battery, particularly a sealed lead storage battery, and more particularly to a method of sealing a pole extending upward through a battery case lid in a liquid-tight and air-tight manner.
[0002]
[Prior art and its problems]
The sealed lead-acid battery is required to be completely sealed except for the safety valve so that oxygen gas does not enter the inside from the outside of the battery container. For this reason, as a conventional method for closing the pole, as shown in FIG. 4, the pole 1 is passed through a through hole 4 provided in the lid 2 and protruded upward, and a rubber packing material such as an O (O) ring 11 is used. Is fitted to the pole 1 to cover the gap 6 between the through hole 4 and the pole 1 from above, and the adhesive 10 is filled into the recess 3 provided so as to surround the pole 1 and solidified. As shown in FIG. 5, the pole 1 having a portion having a diameter larger than that of the through hole 4 of the lid 2 is directly penetrated into the through hole 4 without using the O-ring 11 or the like. A method of filling and solidifying has been adopted.
[0003]
However, in the former method, since the O-ring 11 is used, the bonding area between the pole 1 and the lid 2 is reduced, the bonding strength becomes insufficient, and the adhesive is easily peeled off, and the electrolyte leaks. It became easier. Further, the adhesive 10 leaked into the battery from the gap 6 between the through hole 4 and the pole 1 and adhered to the upper part of the electrode plate group, thereby deteriorating the utilization rate of the electrode plate and causing a reduction in battery capacity. Further, there has been a problem that a portion of the pole 1 that is in contact with the O-ring 11 is corroded, or the electrolytic solution is accumulated in the gap 6 and the pole 1 in this portion is corroded. On the other hand, in the latter method, the surface of the pole 1 is damaged by the through hole 4, or the pole 1 is deformed and the pole 1 does not adhere to the through hole 4, and the adhesive 10 leaks into the battery. As in the case of the former method, the battery capacity was reduced, and the electrolyte was accumulated between the pole and the through-hole, and the pole was corroded. Moreover, since the viscosity of the adhesive 10 was high, handling was troublesome, and the adhesive effect between the adhesive 10 and the pole 1 and the lid 2 was insufficient.
[0004]
The present invention has been made in order to solve the above-mentioned problems, in particular, the problem that an electrolyte solution accumulates between an electrode pole and a through-hole and corrodes the electrode pole. An object of the present invention is to provide a highly reliable method for closing a pole of a storage battery, which does not corrode and leak an electrolyte from a pole pole sealing portion.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a method of manufacturing a battery according to the present invention. The fitting 8 is made of the same material as that of the lid 2 and has a height higher than the height of the through-hole 4. It protrudes from the upper surface,
Next, the fitting 8 is pressed downward while being heated, and the fitting 8 is welded to the through-hole 4 and the gap 6 is sealed so that the lower end is below the lower surface of the through-hole 4. It is characterized by the following.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a cross-sectional view of a main part showing a state in which a pole is passed through a through hole of a battery case in an embodiment of the present invention. FIG. FIG. 3 is a cross-sectional view of a main part showing a state where the fitting is fitted in a gap between the pole and FIG. 3 is a cross-sectional view of a main part showing a state where an output terminal is attached to the pole and an adhesive is filled in a concave portion of the lid. is there.
[0008]
Reference numeral 1 denotes a pole, which is gradually narrowed from the base to the tip as shown in the figure, and is a column made of lead or a lead alloy in this embodiment. Reference numeral 2 denotes a lid, which is made of a thermoplastic resin, has a concave portion 3 on the upper surface, and has a through hole 4 on the bottom surface through which the pole 1 penetrates. Reference numeral 5 denotes a battery case made of the same material as that of the lid 2, and accommodates a pole group (not shown) having the poles 1 therein. Reference numeral 8 denotes an annular fitting made of the same material as the lid, the height of which is higher than the height of the through hole 4.
[0009]
The closing of the pole 1 according to the present invention goes through the steps of FIGS. That is, as shown in FIG. 1, the pole 1 protruding upward from the pole group housed in the battery case 5 is made to protrude into the recess 3 of the lid 2 through the through hole 4 of the lid 2. At this time, for example, assuming that the gradient of the peripheral surface of the pole 1 is 1/10 and the diameter of the peripheral surface of the pole 1 facing the through hole 10 is 10 mm, the diameter of the through hole is about 10.6 mm, and A gap 6 is formed between the electrode and the pole 1.
[0010]
Next, the fitting 8 is inserted from the tip of the pole 1 toward the base, and the fitting 8 is fitted into the gap 6 between the through hole 4 and the pole 1. At this time, as shown in FIG. 2, the upper surface of the fitting 8 protrudes from the upper surface of the through hole 4 and at least the upper part of the gap 6 is closed by the fitting 8. Next, the heated jig 7 is applied to the upper surface of the fitting 8, and the fitting 8 is heated to a melting temperature or higher and pressed downward. When the jig 7 reaches the bottom of the recess 3, the pressing by the jig 7 is stopped, and the jig 7 is rotated to uniformly mix the bottom of the recess 7 and the melted resin of the fitting 8.
[0011]
As described above, when the fitting 8 is heated to its melting temperature, that is, the melting temperature of the lid 2, the fitting 8 and the side wall of the through hole 4 are thermally welded and integrated, and the inner surface of the fitting 8 is Closely adhere to the peripheral surface of the pole 1, and the gap 6 is completely sealed.
[0012]
Next, the jig 7 is pulled up from the concave portion 3, and one end of the output terminal 9 is applied to the tip of the pole 1 as shown in FIG. Thereafter, an adhesive 10 is injected into the recess 3, and the entire pole 1 above the through hole 4 including the connection portion between the output terminal 9 and the pole 1 is covered with the adhesive 10 and solidified. Note that the other end of the output terminal 9 is projected from the upper surface of the lid outside the recess 3.
[0013]
When the pole sealing method of the present invention is performed in this manner, the gap 6 is completely sealed, so that the electrolyte does not accumulate and the pole is not corroded. In addition, since there is no need for components such as an O-ring, there is no need for rework due to improper mounting of the O-ring or the like, and the productivity is excellent.
[0014]
In the present embodiment, the shape of the pole is made gradually thinner from the base to the tip. However, the pole may be made slightly thinner, or may have the same diameter from the base to the tip.
[0015]
【The invention's effect】
As described above in detail, according to the present invention, the gap between the through hole and the pole is filled with the fitting, and the fitting and the pole are in close contact with each other, so that the pole does not corrode and the electrolyte does not accumulate. Absent. Further, since the fitting and the lid are welded and the fitting and the pole are in close contact with each other, the adhesive does not leak into the battery. Therefore, a highly reliable storage battery having excellent life performance can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part, showing an embodiment of the present invention, in which a pole is passed through a through hole of a lid.
FIG. 2 is a cross-sectional view of a main part showing a state where a fitting is fitted in a gap between a through hole and a pole.
FIG. 3 is a cross-sectional view of a relevant part in which an adhesive is injected into a concave portion after an output terminal is attached to the tip of a pole.
FIG. 4 is a cross-sectional view of a main part showing a conventional method in which the pole is sealed using an O-ring.
FIG. 5 is a cross-sectional view of a main part showing a conventional method in which a pole is sealed with only an adhesive.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pole 2 Cover 4 Through hole 6 Gap between through hole and pole 8 Fitting

Claims (1)

After penetrating the pole through the through hole of the lid, an annular fitting is inserted into the gap between the through hole and the pole, and the fitting is made of the same material as the lid, and the height is Higher than the height of the through hole, when inserted into the gap, the upper end protrudes from the upper surface of the through hole,
Next, the fitting is pressed downward while heating, the fitting is welded to the through-hole, and the gap is sealed so that the lower end is lower than the lower surface of the through-hole. How to seal poles of storage batteries.

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