JPS61248359A - Manufacture of enclosed type lead storage battery - Google Patents

Abstract

PURPOSE:To increase initial charge capacity for obtaining battery performance stably even if the battery is preserved for a long time at high-temperature condition by performing initial charge with electric current more than 0.025CA after supplying an amount of electrolytic solution into the battery excessively in comparison with the quantity of the liquid which can be well absorbed in a positive, a negative plates and a retainer, and thereafter, discharging the battery with low-electric current prior to initial charging process. CONSTITUTION:An amount of electrolytic solution excessive in comparison with the quantity of the liquid to be absorbed in a positive, a negative plate and a retainer, is supplied into a battery and the battery is discharged with low-electric current, so that much quantity of small crystallized PbSO4 is formed in the plate pores to retain sulfuric acid in the form of PbSO4. And further, the battery is charged with electric current more than 0.025CA, which is enough power to build up electric potential of the negative plate instead of high-electric current, to transform PbSO4 into PbO2 and at the same time, to retain much quantity of H2SO4 in the plate. PbO2 being produced during this period is formed in large crystal because the battery is charged with low-electric current, so that the porosity of the positive plate increases. And, since the battery is charged continuously until the free liquid is used up, the activity of the negative plate increases in parallel with gassing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to impregnating an isolating material (hereinafter referred to as "retainer") such as a nonwoven fabric made of glass fiber with an electrolytic solution between negative and anode plates.
The present invention relates to a method for producing a sealed lead-acid battery in which the inside of the battery is free of free liquid.

Until now, there have been insufficient measures to prevent performance deterioration for this type of battery, such as when exporting or storing for a long period of time.

Problems to be Solved by the Invention When this sealed lead-acid battery is left in a high temperature for a long period of time, self-discharge is accelerated, the ready-to-use performance of the electrode plate is impaired, and the initial characteristics are poor. There are cases where the battery will not recover just by charging it. In addition, for high rate discharge, it is necessary to manufacture batteries from electrode plates with special specifications.

Means for Solving the Problems The present invention eliminates the above-mentioned problems. After assembling a battery with chemically formed negative and anode plates, when injecting electrolyte into the battery, the positive and cathode plates and retainer are After injecting excess electrolyte with respect to the amount of liquid that can be absorbed into the tank, discharge with a small current before the initial charging process, and then perform the first photoelectric discharge with a current of 0.025 CA or more to remove excess electrolyte. The electrolyte solution is decomposed into a state in which there is no free liquid.

Before the initial charging process, a large amount of lead sulfate is generated in the electrode plate by discharging with a small current. When photoelectrically charged, a large amount of sulfuric acid is retained in the electrode plate, and the porosity of the anode plate increases. As the activation level of the cathode plate increases, the initial capacity f can be raised and the capacity can be increased compared to the conventional battery capacity l.

Example First, the amount of electrolyte solution is injected in excess of the amount of liquid absorbed by the positive and cathode plates and the retainer. Then, by discharging with a small current, a large number of small crystals of PI) 304 are generated in the pores of the electrode plate and retained in the form of sulfuric acid yyr:pbso4. Furthermore, the Pb30. is converted into Pboz, and a large amount of 1-4≧S~ is retained in the electrode plate.

Since the pbo generated at this time is photoelectrically charged with a small current, it becomes large crystals and the porosity of the anode plate increases. Further, since the amount of photoelectric charge is charged until the free liquid is exhausted, the activity of the cathode plate increases with gassing.

Tables 1 and 2 show a performance comparison between the method of the present invention and the conventional method (! Table 2 shows the same initial capacity of the battery during high rate discharge (when the conventional method is set to 1.0).

It is clear from Tables 1 and 2 that the method of the present invention is superior to the conventional method.

Effects of the Invention As described above, the present invention reduces the
It has great industrial value, such as improved sigma weight, increased porosity, increased initial capacity, and stable battery performance even after long-term storage at high temperatures.

Claims (1)

[Claims] In the manufacturing method of sealed lead-acid batteries, in which a retainer is placed in contact between the positive and negative electrode plates to hold the electrolyte, when pouring the electrolyte into the battery after battery assembly, the positive and negative electrode plates and the retainer are Inject an excess amount of electrolyte with respect to the amount of liquid that can be absorbed, then discharge the battery once with a small current, and then reduce the initial charge to 0.0.
A method for manufacturing a sealed lead-acid battery, which comprises passing a current of 25 CA or more to decompose excess electrolyte and make it free of free liquid.