JPH065116U - Sealed lead acid battery - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a sealed lead-acid battery with excellent mass productivity, liquid leakage resistance, and exhaust performance. [Constitution] In a sealed lead-acid battery comprising granules and an electrode plate group embedded in the granules, the granules holding an electrolytic solution necessary for charging and discharging, one opening formed in a lid and one opening formed in the opening. An injection plug installed, the injection plug has a filter and a pressure valve, and the filter has a function of preventing the granules from leaking to the outside of the storage battery. The pressure valve, which has a function of a safety valve, is installed in the passage inside the liquid injection stopper and outside the storage battery rather than the filter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a sealed lead acid battery.

[0002]

[Prior art]

 There are two types of sealed lead acid batteries, the retainer type and the gel type, in which the negative electrode absorbs oxygen gas generated during charging of the storage battery. In the retainer type, a matte separator (glass separator) mainly composed of fine glass fibers inserted between the positive electrode plate and the negative electrode plate holds the sulfuric acid electrolyte necessary for discharging and maintains the polarity of both electrodes. It has been isolated and has been widely used as a backup power source for portable devices and computers in recent years, taking advantage of features such as no maintenance, no leakage, and position free.

However, the glass separator is a generally used separator for a lead storage battery because it is made of a fine glass fiber having a diameter of about 1 μm manufactured by a special method into a mat-like shape. There is a drawback in that the manufacturing cost of the battery is inevitably high because it is considerably more expensive than the battery and the electrode plates have to be strongly pressed and assembled in order to obtain stable battery performance. In addition, unlike open type liquid lead-acid batteries, there is no flowing electrolyte around the electrode plates, so the battery reaction is limited by the amount of electrolyte, and battery performance is inferior to liquid batteries.

On the other hand, the gel type is less expensive than the retainer type, but has a drawback that the initial capacity and the sealing reaction efficiency are inferior to the retainer type sealed lead-acid battery, and the electrolytic solution is separated from the sulfuric acid gel during use. Therefore, there is a drawback that the life performance is not good.

In order to solve these drawbacks, therefore, there has been proposed a sealed lead-acid battery which is neither a retainer type using fine glass fibers nor a gel type using a gel electrolyte. That is, it is a structure in which condensate particles having a high porosity and a large specific surface area are filled as an electrolyte solution holding material in the space between the positive electrode plate and the negative electrode plate and around the electrode plate group. It can be said that silica granules are excellent materials as granules used for the electrolyte holding material of this type of sealed lead acid battery.

However, in a sealed lead-acid battery that uses granules as an electrolyte holding material, when the granules move inside the storage battery due to vibration or the like, a gap is created between the positive electrode plate and the negative electrode plate, and the performance of the storage battery deteriorates. Leading to. Therefore, in order to suppress the movement of the granules, a thin porous sheet 14 is placed on the upper part of the granules, and a perforated resin plate 13 having a plurality of holes is further strongly inserted into the battery case, or The silica granules are fixed by foaming phenolic resin on top of the granules. An example of this is shown in FIG.

[0007]

[Problems to be solved by the device]

 However, the method of using a thin porous sheet and a perforated resin plate in combination is complicated and has a drawback in that the perforated resin plate is required to have high dimensional accuracy because it is forcibly inserted into a battery case. On the other hand, the inside of the foamed phenolic resin has continuous pores and has a 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. However, there is a drawback that it is necessary to break this skin layer and it takes a long time for the work.

The present invention eliminates the above-mentioned drawbacks, and the object thereof is to maintain the advantages of porous granules as an electrolyte retaining material, and to provide excellent mass productivity, leakage resistance, and exhaustability. It is to provide a sealed lead acid battery.

[0009]

[Means for Solving the Problems]

 Therefore, in a sealed lead-acid battery that has granules and an electrode plate group embedded in the granules and holds the electrolytic solution necessary for charging and discharging in the condyle, one opening formed in the lid and one opening formed in the lid. The injection stopper is equipped with a filter and a pressure valve, and the filter has a function of preventing the granules from leaking to the outside of the storage battery. The pressure valve has the function of a safety valve, and is a passage in the liquid injection plug, and is installed on the outside of the storage battery rather than the filter. By doing so, the above problem is solved.

[0010]

【Example】

The present invention will be described below based on embodiments. FIG. 1 is a sectional view of a main part of a sealed lead-acid battery according to an embodiment of the present invention. The battery case 1 contains a positive electrode plate, a negative electrode plate, and an electrode plate group 2 composed of a separator with ribs for keeping the distance between the electrode plates constant and the filled granules 3. As the granules, for example, white carbon (fine granules of ginsui silicon dioxide), diatomaceous earth, fluorite (silica-rich calcium silicate granules) and the like are preferable. Both porosity 80-90%, the range of specific surface area 10 to 300 m ² / g, Garasusepare - has a fairly large specific surface area compared to 1 to 2 m ² / g of data. Reference numeral 4 is a pole for taking out an electric current formed on the upper part of the electrode plate group. The battery case 1 and the lid 5 are joined by heat or an adhesive which is a well-known means. One opening 6 is provided on the top of the lid 5. Reference numeral 7 is a plug fitted in the opening 6. The stopper 7 has a filter 9 and a pressure valve 8 having a safety valve function. The filter 9 has a function of preventing the granules 3 from leaking to the outside of the storage battery, and is provided in the exhaust passage 12 in the plug body 7. The pressure valve 8 is attached to the exhaust passage 12 in the plug body 7 at a position 12a on the outer side of the storage battery with respect to the filter 9. The filter 9 may be formed integrally with the plug body 7 in advance, or may be fixed by the plug body part after the filter 9 is attached to the opening 6. The particle size of the silica granules is 0.01 to 100μ, while the pore size of the porous filter is distributed in the range of about 0.1 to 200μ. It is preferable that the silica granules have good properties and can easily filter the silica granules. Further, the filter is preferably made of silicone resin or polyethylene resin and is not hydrophilic and has hydrophilicity.

Such a storage battery can be manufactured by the following procedure. First, the electrode plate group 2 is manufactured, and then this is inserted into the battery case 1, and thereafter, the lid having one opening 6 for both filling of granules and injection is joined to the battery case 1. In order to facilitate the filling of the granules, the opening 6 is preferably as large as possible and designed so as not to impede the close working of the pole 4 and the pole fixing sealer 11. Is. Further, since the opening 6 is also used for inserting the plug body 7, a circular shape is preferable. Next, the pole 4 is tightly fixed with a fixing sealer 11 so as to prevent airtight leakage. Then, the granules 3 are filled in the battery case 1 through the opening 6 and the stopper 7 is attached. The electrolyte is defined by the liquid injection stopper 7. After the injection of the electrolytic solution and the completion of the first charge, the rubber valve 8 having a cylindrical bottom is fitted into the valve seat provided in the injection plug. The rubber valve 8 used here is configured to open when the internal pressure of the battery case rises to about 1.2 Kg / cm ² at the time of charging or the like, and let gas escape to the outside. Finally, the cap 10 is attached to complete the process.

According to such a sealed lead-acid battery, mass productivity is far higher than the conventional one in which granules are filled and then fixed with a foamed phenol and a lid is joined. Moreover, as a result of performing a charge / discharge test on the completed storage battery under predetermined conditions, it was confirmed that there was no overflow and proper exhaustion, and that it had the advantages of granules.

[0013]

[Effect of device]

 According to the storage battery according to the present invention, since the whole of the battery case is filled with the granules, the granules do not move due to vibration and the like, the electrolytic solution between the electrode plates is stably held, and the storage battery performance does not deteriorate. Further, since the granule filling work can be performed after the battery case and the lid are joined in advance, the scattering of the granules can be reduced and the working environment can be improved. Moreover, a foaming phenol or the like is not required to fix the condyles, which reduces the number of working steps. Further, since the injection and the exhaust are smoothly performed through the filter, the work time is shortened compared to the conventional storage battery of this kind. The practical value of the present invention is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts of a conventional example.

[Explanation of symbols]

 1 Battery Case 2 Electrode Plate Group 3 Granules 5 Lid 6 Opening 7 Filling Plug 8 Pressure Valve 9 Filter 12 Passage in Filling Plug (

Claims (1)

[Scope of utility model registration request] 1. A sealed lead-acid battery comprising a granule (3) and an electrode plate group (2) embedded in the granule (3), wherein the granule (3) holds an electrolytic solution required for charging and discharging. It comprises one opening (6) formed in the lid (5) and an injection plug (7) attached to the opening (6), and the injection plug (7) is a filter (9) and a pressure valve. The filter (9) has a function of preventing the granules (3) from leaking to the outside of the storage battery, and is provided in the passage (12) portion in the liquid injection stopper (7). The pressure valve (8) has a function of a safety valve, is the passage (12) in the liquid injection stopper (7), and is the filter (9).
The sealed lead-acid battery is characterized in that it is mounted on the outer side (12a) of the storage battery.