JPS6050A - Sealed alkaline storage battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in an assembled sealing body that integrates a cap that also serves as an anode terminal for a sealed alkaline storage battery and a sealing plate.

Structure of the conventional example and its problems As shown in FIG. 4, the sealing body of this type has an elastic valve body 1 inside which also serves as an anode terminal, and has an exhaust hole 2 in a part of the rising peripheral wall. The cap 3 was integrated by caulking at both ends of a sealing plate 6 having a ventilation hole 4 in the center.

The cap 3 and the sealing plate 5 are usually made of a relatively rigid material such as a stainless steel plate or a nickel-plated steel plate, and the ventilation hole 4. Exhaust hole 2 discharges oxygen gas inside the battery.
When hydrogen gas is abnormally generated, the elastic valve body 1 opens and releases the gas from the vent hole 4 through the exhaust hole 2 to the outside of the battery, thereby maintaining safety.

As shown in FIG. 1, a typical structure of a sealed alkaline storage battery is such that a spiral electrode group 6 is inserted into a battery case 7 which also serves as a cathode terminal, a cap 3 which also serves as an anode terminal, and a sealing plate 6.
An anode lead piece 9 led out from the electrode group inside the battery is spot-welded at a connection point 10 to the sealing plate 5 of the assembled sealing body 8 in which the elastic valve body 1 is incorporated as a safety device between the battery and the cap 3 for electrical conduction. It is used as an anode terminal. Further, the assembly sealing body 8 on the anode side and the battery case 7 on the cathode side are insulated by a ring-shaped insulator 11. An alkaline storage battery with this structure is
Disadvantages of battery systems using alkaline electrolytes due to their creep characteristics include (1) Leakage from minute gaps such as between the exhaust hole 2, the battery case 7 and the insulator 11, and the assembly sealing body 8 and the insulator 11; ■There is some heat generation during abnormalities such as charging/discharging due to large current or polarity short circuit. Therefore, as a measure to prevent this, the upper part of the unit cell should have a liquid-absorbing property as shown in Figure 4, and a camp insertion hole should be made in the center, and a tarring-shaped insulator 12 should be placed, and then the outer periphery of the unit cell should be covered with an exterior covering such as a resin tube. I was captured at 13'
In order to increase the battery capacity density as much as possible, it is effective to increase the reaction area of the electrode group, and as a countermeasure, the height of the electrode group is increased. However, since it is necessary to keep the total height of the battery within a certain standard,
As a matter of course, the height h of the cap 3 which also serves as the anode terminal
l (see Figure 4) must be made low. In this case, the actual protrusion height h2 of the cap 3 above the battery case 7 in FIG. If the outer diameter φ1 of the cap 3 is smaller than the inner diameter φ2 of the cap 3, it is easy to fit the ring-shaped insulator 12 into the camp, but it cannot be held securely, and post-process work for holding it is required, which increases the number of man-hours. becomes. On the other hand, in the case of φ1 < φ2, the insulator 12 is hard to fit into the camp 3, causing cracks or tears, making it difficult to work, and causing problems such as unstable quality. There were also problems with accuracy.

OBJECTS OF THE INVENTION The present invention solves the various problems described above by providing a notch in the cap as an exhaust hole and forming an outward protrusion at the upper end of the notch.

Structure of the Invention According to the present invention, an outward protrusion is formed at the upper end of a notch provided in a cap, and a liquid-absorbing ring-shaped insulator held by the protrusion is fitted into the upper cap. It is characterized by

DESCRIPTION OF EMBODIMENTS FIG. 2 shows an assembled sealing body according to an embodiment of the present invention, in which a slit-shaped notch 14 is optionally provided in a part of the circumferential side wall of a can 130 that also serves as an anode terminal, and An outward protrusion 15 is provided on the outer surface.

This protrusion 15 is connected to the upper end wall of the exhaust hole and the ring-shaped insulator 12.
Also serves as a stopper. Notch 14 and protrusion 15
An enlarged view of is shown in Fig. 3. As is clear from this figure, the protrusion 15 protrudes outward by a length 2 from the circumferential side wall of the cap 3. Therefore, the ring-shaped insulator 12 shown in FIG. 30 When inserted into the circumferential side wall, the thickness h4 of the ring-shaped insulator 12 is h4>h3 with respect to the height h3 from the flange of the cap 3 to the protrusion.
．． Regardless of h4<h3, the ring-shaped insulator can be held by the protrusion 15 of the camp 3.

In this case, the inner diameter φ2 of the ring-shaped insulator 12 is
Although the outer diameter φ3 of the cap 3 including the cap 3 must be smaller than the outer diameter φ3, the dimensional tolerance can be increased compared to the conventional case, and the ring-shaped insulator can be easily installed.

Effects of the Invention As described above, in the present invention, even if the height of the cap is reduced, since the outward protrusion exists as a stopper, the ring-shaped insulator can be inserted and held in the Yayanop reliably, and the exhaust of the cap can be prevented. It is also possible to reliably remove the electrolyte mist that is ejected from the cutout, which is the hole, along with the exhaust gas.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway view showing a typical structure of a sealed alkaline storage battery, Fig. 2 is a sectional view of an assembled sealing body in an embodiment of the present invention, and Fig. 3 is an enlarged view of the cap portion of the sealing body. Fourth
Figure a is a cross-sectional view of a conventional assembled sealing body, and the same figure is a cross-sectional view showing a liquid-absorbing ring-shaped insulator. DESCRIPTION OF SYMBOLS 1... Elastic valve body, 3. Cap, 4... Vent hole, 6... Sealing plate, 12... Ring-shaped insulator with liquid absorption property, 14... - Notch, 15 outward protrusion.

Claims (1)

[Claims] Equipped with an assembled sealing body that integrates a camp that also serves as an anode terminal, a metal sealing plate, and an elastic valve body sandwiched between the two,
An arbitrary notch is provided in the side wall surface rising from the flange of the cap, an outward protrusion is formed at the upper end of the notch, and the liquid-absorbing material held by the protrusion is formed on the upper cap. A sealed alkaline storage battery made by fitting ring-shaped insulators.