JPH0735304Y2 - Sealed lead acid battery - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead acid battery.

[0002]

2. Description of the Related Art There are two types of sealed lead storage batteries of the type in which oxygen gas generated during charging of the storage battery is absorbed by the negative electrode: retainer type and gel type. The retainer type holds the sulfuric acid electrolyte necessary for discharging and separates both electrodes by a mat-shaped separator (glass separator) mainly composed of fine glass fibers inserted between the positive electrode plate and the negative electrode plate. It has been widely used in recent years as a backup power source for portable devices and computers, taking advantage of its features such as no maintenance, no leakage, and position-free.

However, since the glass separator is made of a fine glass fiber having a diameter of about 1 micron manufactured by a special method and formed into a mat, it is considerably expensive as compared with a commonly used separator for a lead storage battery. Nah,
In order to obtain stable battery performance, it is necessary to strongly squeeze and incorporate the electrode plate group, which inevitably increases the manufacturing cost of the battery. Also, the sulfuric acid electrolyte can be retained only by the glass separator inserted between the positive and negative electrode plates, and the electrolytic solution cannot be placed around the electrode plate group like the open type lead acid battery. However, the battery reaction is limited by the amount of the electrolytic solution, and the battery performance is inferior to that of the liquid battery.

On the other hand, the gel type is less expensive than the retainer type, but has a drawback that the battery performance is inferior to that of the retainer type sealed lead acid battery, and the life performance is long because the electrolytic solution separates from the sulfuric acid gel during use. It has the drawback of not being good.

Therefore, in order to eliminate these drawbacks,
A sealed lead-acid battery has been proposed which is neither a retainer type using fine glass fibers nor a gel type using a gel electrolyte. That is, as the electrolyte holding material, granules having high porosity and large specific surface area, for example, silica granules,
Is a sealed lead-acid battery having a structure in which the above granules are filled in the gap between the positive electrode plate and the negative electrode plate and around the electrode plate group. Silica granules are inexpensive materials that are mass produced and sold, and because they have excellent acid resistance and electrolyte retention, they are excellent materials for use as electrolyte retention materials in this type of sealed lead-acid battery. It can be said that there is.

However, in the above sealed lead-acid battery using the granules as an electrolytic solution holder, the granules move to the upper part of the storage battery together with the electrolytic solution and the generated gas discharged from the electrode plate during charging, and the positive electrode plate and the negative electrode. A gap may be formed between the plate and the battery, and the storage battery performance may be degraded.

Therefore, in order to suppress the movement of the granules, a porous thin sheet 13 is placed on the upper part of the granules, and a perforated resin plate 12 having a plurality of holes is further strongly inserted into the battery case. Alternatively, the silica granules are fixed by foaming a phenol resin on the upper part of the powder. An example of this is shown in FIG.

[0008]

However, the method of using a thin porous sheet and a perforated resin plate in combination is complicated and must be strongly inserted into the battery case. Therefore, the perforated resin plate is required to have high dimensional accuracy. There is a drawback that On the other hand, the foamed phenolic resin has open cells inside and high porosity and excellent acid resistance, but a skin layer is formed on the surface of the foamed phenolic resin, which impedes gas and liquid permeation. The disadvantage is that the layers have to be broken, which takes a long time to work.

The present invention eliminates the above-mentioned drawbacks, and an object of the present invention is not to impair the advantages of granules as an electrolyte retaining material, but to improve the mass productivity, leakage resistance, and exhaust performance of a sealed lead-acid battery. Is to provide.

[0010]

[Solution for solving the problem] Therefore, the electrode plate group is stored.
And granules filled in battery internal full that, a necessary and sufficient electrolyte to discharge those held substantially granules
When, as having a function of preventing the exhaust chamber provided in the battery top, granules a filter that isolates the exhaust chamber and an internal storage battery from flowing to the battery exterior, it is mounted on the outlet of the outlet chamber A sealed lead-acid battery, characterized in that, even if the electrolytic solution leaks from the inside of the storage battery through the filter to the exhaust chamber, it does not leak outside the storage battery by accumulating in the exhaust chamber. By solving the above problems, the above problems are solved.

[0011]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view of a main part of a sealed lead-acid battery according to the present invention. The battery case 1 includes a positive electrode plate, a negative electrode plate, and an electrode plate group 2 composed of ribbed separators for keeping the electrode plate spacing constant,
The interior of the storage battery 11 and the granules 3 filling the space are stored. As the granules used here, for example, white carbon (fine powder of hydrous silicon dioxide), diatomaceous earth, fluorite (silica-rich calcium silicate powder) and the like are suitable. Both have a porosity of 80 to 90% and a specific surface area of 10
It is in the range of 300 m / g and is 1-2 of the glass separator.
It has a considerably large specific surface area as compared with m / g.
Granules having a high porosity and a large specific surface area may be used, and white carbon is used this time. Reference numeral 4 denotes a current extracting pole formed on the upper part of the electrode plate group 2. The battery case 1 and the lid 5 are joined by heat or an adhesive material. Reference numeral 6 is an exhaust chamber formed in the lid 5. Reference numeral 8 denotes an exhaust port formed in the exhaust chamber 6. An exhaust valve 9 is attached to the exhaust port 8. The exhaust valve 9 has a structure that opens when the internal pressure of the storage battery rises by about 0.2 atm higher than the external pressure and allows gas to escape to the outside. Although the location of the exhaust port 8 is not particularly limited, it is necessary to prevent the electrolytic solution from leaking to the outside of the storage battery even if the electrolytic solution leaks to the exhaust chamber 6. The inside 11 of the storage battery and the exhaust chamber 6 are separated by a filter 7. The filter 7 has a function of preventing the granules 3 from coming out of the storage battery, and can be attached to the lid 5 by a method such as adhesion or strong insertion. It is essential that the filter 7 has low water flow and ventilation resistance. From the viewpoint of injecting liquid, it is preferable that the filter 3 has hydrophilicity without being treated with water such as silicone resin. The lid 5 is provided with a hole 9 for filling the whole of the battery case with granules, and the hole 9 is sealed with a plug 10 via packing after filling the granules. Even if the electrolytic solution leaks from the inside 11 of the storage battery to the exhaust chamber 6 through the filter 7, the electrolytic solution needs to have an appropriate space volume so that the electrolytic solution does not leak to the outside of the storage battery by being accumulated in the exhaust chamber 6.

Such a storage battery has a pre-made electrode plate group 2
Is inserted into the battery case 1, then the lid 5 with the filter 7 attached is joined, then the granules 3 are filled in the battery case through the hole 9 and then the hole 9 is sealed with the plug 10 and then exhausted. It can be obtained by injecting liquid using the mouth 8 for the first charge and finally attaching the exhaust valve 9.

[0013]

According to the storage battery of the present invention, since the entire interior of the storage battery is filled with granules, the granules do not move due to vibration or the like, and the electrolytic solution is stably held between the electrode plates.
Therefore, there is no deterioration of the storage battery performance due to the movement of the granules.
In addition, in order to prevent the electrolyte from oozing out at the initial stage of use of the storage battery, since the exhaust chamber is provided and the electrolyte is stored there, it is possible to prevent the electrolyte from leaking to the outside of the storage battery. Also, for the liquid injection work, a long time was conventionally required, but by using a filter with low ventilation resistance and low water resistance, the liquid injection work becomes easier,
Work time can be shortened. Furthermore, by filling the whole of the storage battery with granules, the height of the electrode plate group can be made large, and a high-performance battery with large volume efficiency can be manufactured. As described above, the practical value of the present invention, which provides a sealed lead acid battery excellent in mass productivity, liquid leakage resistance, and exhaust property without impairing the advantages of granules as an electrolyte solution holding material, is great.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Battery Case 2 Electrode Plate Group 3 Granules 4 Pole 5 Lid 6 Exhaust Chamber 7 Filter 8 Exhaust Port

Claims (1)

[Scope of utility model registration request] 1. An inside (11) of a storage battery accommodating an electrode plate group.
And granules filled in full required at sufficient electrolyte to charge and discharge
Which are substantially retained in the granules, an exhaust chamber (6) provided above the storage battery, and a filter (7) separating the exhaust chamber (6) and the inside of the storage battery (11) The storage battery has a function of preventing it from flowing out of the storage battery and an exhaust valve (9) attached to the exhaust port (8) of the exhaust chamber (6). A sealed lead acid battery, characterized in that even if it leaks to the exhaust chamber (6) through 7), it does not leak outside the storage battery by accumulating in the exhaust chamber (6).