JPS6251168A - Manufacture of sealed alkaline storage battery - Google Patents

Abstract

PURPOSE:To secure the level of partial charge of the negative plate by adding a compound which undergoes anodic oxidation during charging while pouring an electrolyte into a sealed alkaline storage battery. CONSTITUTION:A compound which undergoes anodic oxidation during charging is added while an electrolyte being poured into a battery containing an anode plate the level of partial charge of which is not secured. For example, ethylene glycol used as the above compound is oxidized into oxalic acid through glycol aldehyde, glyoxal, glycolic acid and glyoxylic acid. Since the level of charge of the anode plate coincides with the degree of charging although the level of charge of the cathode electrode decreases during the initial stage of charging, the difference between the levels of charge of the cathode and the anode plates corresponds to the level of partial charge. Therefore, it is possible to secure the level of partial charge of the anode plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing sealed alkaline storage batteries, particularly nickel-cadmium storage batteries (hereinafter referred to as "nickel-cadmium batteries").

Conventional technology Conventionally, methods for securing a partially charged portion (hereinafter referred to as "partially charged") in the cathode plate include methods in which the formation process is performed by performing chemical charging → chemical discharging → partial charging, or chemical charging → partial charging. Charge by discharging I;
- Also, when assembling without performing chemical conversion, a reduced substance was added to the electrode plate in advance.

Problems to be Solved by the Invention When securing conventional partial filling by chemical formation, there are significant disadvantages in terms of equipment and cost. Furthermore, when assembled without chemical conversion, reduced products such as metal cadmium powder have the disadvantage of being expensive.

Means for solving the problem In order to solve the above problem, when pouring electrolyte into a battery assembled using a cathode plate that does not have a partial charge capacity, it is necessary to add an additive that causes anodization during charging. By investing,
This ensures a partial charge on the cathode plate.

When an additive to be anodized, for example, ethylene glycol (hereinafter referred to as "EG") is oxidized, it is oxidized to glyfuraldehyde, glyoxal, glycolic acid, glyoxylic acid, and then to oxalic acid. Therefore, in the initial charging, the charge that charges the anode is used to oxidize gG,
The amount of charge on the anode decreases. However, since the amount of charge on the cathode plate is equal to the amount of charge, the cathode plate is charged.

EXAMPLE An example of the present invention will be described. Target model is N1200
The test was carried out using an SO type 2-cadmium battery.

The anode plate was made by charging a 315 x 355 mg sintered plate 1 ζ impregnated with about 771 active materials at 3.7 A for 15 hours.
．． Five people completely discharged the battery. Wash this electrode plate with water for 1 hour,
It was dried at 0°C for 2 hours and cut into 170×3tam veneers.

The cathode plate was made by impregnating a sintered plate of 315 x 395 am with about 103p of active material and charging it at 6.5A for 15 hours.
．． Fully discharged at 5A. Wash this electrode plate with water for 1 hour,
It was dried for 2 hours at 0°C and cut into 190x34 veneers.

Figure 1 shows the decrease in anode capacity when the amount of EG added to a battery assembled using these anode and cathode plates was varied.

Effect of the invention From Figure 1, by adding g G 0.351- about 4
It was found that 1 tfiL of partial charge of 50 mAh was secured, and as a result of examining the amount of partial charge by over-discharging, it was possible to secure approximately the same amount of partial charge.

[Brief explanation of the drawing]

FIG. 1 shows that in one embodiment of the present invention, E
FIG. 3 is a relational diagram showing the amount of cathode partial charge secured by anodizing G. FIG.

Claims (1)

[Claims] A method for manufacturing a sealed alkaline storage battery, which is anodized and is characterized by adding an additive that reacts with the electrolyte to form a salt, and securing a partially charged portion during initial charging and discharging.