JPS6217946A - Enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To improve the service life of storage battery by sintering synthetic resin powder into sheet while employing such separator where SiO2 powder is adhered to the fused section of sheet thereby geletinizing the electrolyte uniformly in the battery jar and eliminating shifting of electrolyte. CONSTITUTION:Synthetic resin powder such as polypropylene powder, soft or hard polyethylene powder having the diameter of 10-100mu is sintered into sheet then the surface section of said sheet is fused uniformly to be adhered with 0.05-5wt% of SiO2 powder such as aerosol powder thus to form a separa tor of 0.5-3mm thick having continuous void. Then the separator is arranged between the negative and positive plates and inserted into the battery jar to be impregnated with diluted sulfuric acid electrolyte. Consequently, aerosol powder contained in the separator is dissolved to geletinize the diluted sulfuric acid electrolyte, resulting in an enclosed lead storage battery containing non- fluidized diluted sulfuric acid electrolyte.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in sealed lead-acid batteries.

Techniques involved and their problems Hitherto, a substantially non-fluidized dilute sulfuric acid electrolyte has been used as the electrolyte for sealed lead-acid batteries. The method for making the electrolyte non-fluid is to place a highly liquid-absorbing fine glass fiber mat made mainly of glass fibers with a diameter of 1 or less between the negative and anode plates, and to make the electrolyte fluid. There are methods such as impregnation to such an extent that the mat is not impregnated, a method using a gel electrolyte, and a method using a combination of a fine glass fiber mat and a gel electrolyte. However, the above-mentioned fine glass fiber mat is expensive, and the gel electrolyte has drawbacks in that it is difficult to uniformly inject the gel electrolyte into the battery.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and provides a sealed lead-acid battery that is inexpensive and easy to manufacture.

Structure of the Invention The present invention is a sealed lead-acid battery characterized by using a separator made by sintering synthetic resin powder into a sheet and adhering SiO2 powder to the fused portion of the sheet.

Example First, Voliptetrapyrene powder with a diameter of 10 to 100 microns,
After sintering and forming synthetic resin powder such as soft polyethylene powder or hard polyethylene powder into a sheet, the inner surface of the sheet is uniformly melted, and 0.05 to 5% by weight of Aerosil powder is added to the melted part as SiO2 powder. A separator having a thickness of 0.5 to 3 cm and having continuous pores is formed by adhering. Thereafter, the separator is placed between the negative and anode plates and inserted into the battery case in a conventional manner, and then the separator is impregnated with a dilute sulfuric acid electrolyte.

This causes the Aerosil powder contained in the separator to dissolve and the dilute sulfuric acid electrolyte to gel. By the above method, a sealed lead-acid battery of the present invention having a dilute sulfuric acid electrolyte that is substantially non-fluidized is completed.

FIG. 1 is a diagram showing the relationship between the number of alternate charging and discharging lifetimes of the storage battery of the present invention and the proportion of 5102 powder contained in the separator. When the proportion of 5102 powder is less than 0.05% by weight, the gelling ability of the electrolyte is small and the life is short, and when it exceeds 5% by weight, the gas absorption capacity is reduced and the life is also short.

Therefore, the appropriate proportion of 5io2 powder is 0.05 to 51% by weight.

Figure 2 is a diagram showing the relationship between the number of alternate charging and discharging lifetimes of the storage battery of the present invention and the thickness of the separator. The thickness of the separator is [1,
If it is less than 5 fla, the required amount of electrolyte cannot be maintained and the life will be short; if it exceeds 53 mm, the gas permeability will be poor and the life will be short. Therefore, the thickness of the separator is 0.5 to 3 mm.
is appropriate.

In addition to the paste-type electrode plate, a clad-type electrode plate can also be used as the electrode plate used in the present invention.

Effects of the Invention The present invention is a sealed lead-acid battery using a separator in which synthetic resin powder is sintered into a sheet shape and 5io2 powder is attached to the fused portion of the sheet, and an expensive fine glass fiber mat is not used. Therefore, it is possible to reduce the cost of storage batteries. In addition, a separator in which 5io2 powder, which is a gelling agent, is evenly dispersed in a dry state is placed between the negative and anode plates, and the electrolyte is injected after the separator is inserted into the battery case. The electrolyte can be gelled. Furthermore, since the electrolyte can be uniformly gelled within the battery container, the electrolyte is not unevenly distributed and the life performance of the storage battery is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between the number of alternate charging and discharging lifetimes of the storage battery of the present invention and the proportion of 5102 powder contained in the separator, and FIG. 2 is a diagram showing the relationship between the number of lifetimes and the thickness of the separator.

Claims (1)

[Scope of Claims] 1) A sealed lead-acid battery characterized by using a separator made by sintering synthetic resin powder into a sheet and adhering SiO_2 powder to the fused portion of the sheet. 2) The separator is 0.05-5% by weight of SiO_2
A sealed lead-acid battery according to claim 1, which contains powder. 3) The sealed lead-acid battery according to claims 1 and 2, wherein the separator has a thickness of 0.5 to 3 mm.