JPS61121262A - Sealed type lead storage battery - Google Patents

Abstract

PURPOSE:To reduce the number of components and prevent the leakage of an electrolytic liquid into the outside by providing a partition on the external circumference of an exhaust port closed by a valve, specifying the value of the gap between the partition and a top cover, and providing a groove on the external circumference of the partition. CONSTITUTION:A sealed type lead storage battery is formed by providing an inner cover 8 with an exhaust port 3 closed by a cap type valve 2 and a top cove 1 covering this exhaust port, also an annular partition 4 with a plane section 10 at the upper section on the external circumference of the exhaust port 3, setting the gap 6 between this partition 4 and top cover 1 to less than 1.5mm, and providing a groove 5 as the electrolytic liquid collector on the external circumference of the partition 4. As a result, the splash of the electrolytic liquid that is going to be leaked along with the generation of gas at charge can be collected on the external circumference of the exhaust port 3 and can be prevented from passing off the partition 4 and being leaked into the outside. That is, the leakage of the electrolytic liquid can be suppressed with simple structure without using an electrolytic liquid absorption mat and such.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a sealed lead acid battery.

BACKGROUND OF THE INVENTION Conventionally, a closed lid with a substantially flat upper surface includes an inner lid 8 having an exhaust port 3 closed by a cap-shaped valve 2 shown in FIG. 6, and an upper lid 7'CI for covering the exhaust port portion. A method for preventing the electrolyte from scattering or leaking to the outside of a known lead-acid storage battery is to place a flat liquid-absorbing mat 11 made of kraft paper in the space outside the exhaust port 3. position,
The problem that the invention seeks to solve is that the electrolyte is absorbed by the mat by sandwiching it between the upper lid 1 and the inner lid step outside the exhaust port 3, thereby preventing damage to surrounding equipment. However, this configuration requires a liquid-absorbing mat, which increases the number of parts and man-hours, which increases the cost.

The present invention is intended to improve the above-mentioned conventional problems, and aims to provide a sealed lead-acid battery at low cost, which can prevent leakage of electrolyte to the outside with a simple structure.

Means for Solving the Problems In order to achieve the above object, the present invention provides a sealed lead-acid battery comprising an inner lid having an exhaust port closed by a valve, and an upper lid for covering the exhaust port portion. A partition wall having a flat portion on the upper part is provided on the outer periphery of the exhaust port, and between this partition wall and the top lid, 1. s, provide a gap within 71m, and
A special feature characterized by the provision of grooves on the outer periphery.With this configuration, leakage of electrolyte to the outside of the battery can be prevented without using a liquid-absorbing material such as a liquid-absorbing mat to prevent liquid leakage. Liquid can be prevented.

Example An embodiment of the present invention will be described below with reference to the drawings.

Note that the same reference numerals are given to the parts having the same configuration as in the conventional example, and the explanation thereof will be omitted.

FIG. 1 shows the structure of a sealed lead-acid battery according to an embodiment of the present invention, and FIG. 2 shows a sectional view of the main parts thereof. In FIGS. 1 and 2, there is an inner lid 8 having an exhaust port 3 closed with a camp-shaped valve 2, and an upper lid 1 for covering this exhaust port portion.
are provided.

In the recess in the center of the inner lid 8 where the exhaust port is provided, an annular partition wall 4 having a flat part 10 on the upper part is provided on the outer periphery 9 of the exhaust port 3. In addition to providing a gap 6 within the range of 100 to 100 cm, liquid is placed on the outer periphery of the partition wall 4! It has a structure in which a groove 5 is provided as a groove. With this configuration, when charging, the electrolyte droplets 7 that are about to leak out together with the gas due to gas generation from the electrode plates are absorbed into the exhaust port 3 along with the gas.
However, due to the venturi action between the valve 2 and the exhaust port 3, the gas condenses and accumulates on the outer periphery 9 of the exhaust port 3. If the battery is inverted, etc., this droplet 7 will pass through the partition wall 4 and attempt to further leak to the outside, but the liquid droplet 7 will leak between the partition wall 4 and the top lid 1.
Due to the narrow gap 6 within 1.5 mm provided between
The droplets 7 are held under the influence of surface tension. The dimensions of the gap here are determined by placing two synthetic resin plates 10 diagonally facing each other as shown in FIG. Set it aside, and put the synthetic resin plate 1
Inject the electrolyte from the top of the tube. Then, it was determined from the gap that could hold the electrolyte at that time. The relationship is shown in FIG. From this figure 4, the gap size is 1.5 + 11111
It was found that it is possible to retain the electrolyte within
It was also found that when the gap exceeds 1.6 mark, it is possible to hold the electrolyte for a short time, but it is not possible to hold it for a long time. A groove 5 provided on the outer periphery of the partition wall 4 is provided to prevent droplets 7 held in the gap between the partition wall 4 and the upper lid 1 from leaking to the outside through the upper lid 1 and the inner lid 8. It functions as a liquid pool. This prevents leakage of the electrolytic solution, and furthermore, it is possible to omit a liquid-absorbing material such as a liquid-absorbing mat for preventing liquid leakage, thereby reducing the number of parts and the number of man-hours.

Effects of the Invention As described above, the sealed lead-acid battery of the present invention prevents electrolyte from leaking to the outside, and can also eliminate the conventional liquid absorbing material for preventing leakage, and reduce the number of work steps. It is possible to provide an inexpensive sealed lead-acid battery.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a sealed lead-acid battery according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a test jig for determining the gap, and Fig. 4 is a FIG. 6 is a characteristic diagram showing the relationship between gap size and width for obtaining surface tension, and is a partially cutaway perspective view of a conventional sealed lead acid battery. 1... Upper lid, 2... Cap-shaped valve,
3... Exhaust port, 4... Bulkhead, 5...
... Groove, 6 ... Gap, 8 ... Inner lid, 1o ... Upper flat part of partition wall. Name of agent: Patent attorney Toshio Nakao and one other person (Figure 3, Figure 4) (Wlm)

Claims (1)

[Claims] A sealed lead-acid battery comprising an inner lid having an exhaust port closed by a valve and an upper lid for covering the exhaust port portion, wherein a partition wall having a flat portion at the top is provided around the outer periphery of the exhaust port. , a sealed lead-acid battery that has a gap of 1.5 mm or less between the partition wall and the top lid, and a groove on the outer periphery of the partition wall.