JPS62126565A - Manufacture of sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To uniformly distribute an adequate amount of electrolyte in plates and retainers by pouring a sulfuric acid containing gel mainly comprising silica into retainers, and performing formation in a container with step constant current. CONSTITUTION:Conventional production and assembly processes are omitted, and non-formed plates are assembled and put into a container. An adequate amount of dilute sulfuric acid is impregnated into plates and retainers, then, a sulfuric acid containing gel mainly comprising silica is poured into the retainers. Formation is performed in the container with step constant current, and controlled in the potential at which closed reaction is undergone in the final stage of the formation. thereby, the electrolyte is uniformly distributed into the plates, and in addition the process is simplified.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing a sealed lead-acid battery.

Conventional Technology In order to improve the charging and discharging performance of sealed lead-acid batteries, it is important to retain as much dilute sulfuric acid as possible and uniformly in the positive and negative electrode plates and the retainer.

However, if it is too large, it will cause free liquid or C leakage, and if it is too small, internal resistance will increase and performance will deteriorate. Therefore, it is necessary to absorb all the free liquid from the retainer by some means. On the other hand, if the retainer is uniformly impregnated with electrolyte, the charge/discharge reaction will concentrate on a part of the plate, and the remaining plate will become sulfated, and the active material in the reaction area will become muddy. Leads to.

Therefore, conventional sealed lead-acid batteries use prefabricated plates at °C.
Either assemble the battery and inject a predetermined amount of electrolyte into it, or inject an excessive amount of electrolyte into the retainer of a cage-type battery assembled using unconverted plates to prevent gassing caused by cell formation. The amount of electrolyte impregnated was adjusted to an appropriate amount by thinning.

Problems to be Solved by the Invention In the sealed lead-acid batteries manufactured by the above-mentioned manufacturing method, the porosity or surface area of the pre-treated plates, the dimensions of the battery case, and the dimensions of the retainer are different, so it is difficult to inject a specified amount of electrolyte. Fluctuations occurred between the cells, resulting in non-uniformity of the liquid, and the sealing reaction efficiency also varied from cell to cell. In addition, in the case of the latter, when carrying out cell formation at °C by impregnating the retainer with an excessive amount of liquid, constant flow formation was carried out regardless of the sealed reaction efficiency, and overcharging was performed until the remaining free liquid disappeared. In such a battery, the sealing reaction is ignored, resulting in overcharging, and it is thought that it is difficult to uniformly disperse the electrolyte in the retainer and electrode plates.

Means for Solving the Problems The present invention improves the above-mentioned drawbacks of the cage-type sealed lead-acid battery, and provides an excellent sealed lead-acid battery in which an appropriate amount of electrolyte is uniformly dispersed in the electrode plates and the retainer. The present invention provides a method for manufacturing.

The method is to omit all the manufacturing and assembly processes of the pre-treated plates in the AT, insert the electrode plates in an uncured state into the assembly-RT tank, and impregnate the electrode plates and retainer with an appropriate amount of dilute sulfuric acid. Then, the force position is controlled.

Function The present invention improves the efficiency of the sealing reaction because the terminal voltage decreases when the electrode plate is impregnated with an appropriate amount of electrolyte, and overcharging in the cell forming process can be minimized and the battery can be terminated at °C. Even if overcharging occurs, the electrolytic solution in the gel can be supplied to the retainer, so that uneven reduction of the electrolyte and less loss of liquid in the retainer in contact with the electrode plates can be avoided. Furthermore, since the container is made of chemical material, the assembly process is extremely simple.

As an example, the theoretical capacity of the positive electrode plate is 13Ah, and the nominal capacity is 114.
In the case of an Ah battery, the appropriate amount of dilute sulfuric acid to be impregnated is 32g. Now, in order to make the formation condition of the positive far east active material good, the formation charge amount is set to 200 yen of the theoretical capacity. Therefore, the overcharge amount is 1004, which is LaAh'9. Generally, when carrying out battery cell formation with an excess amount of liquid, the electrolyte is electrolyzed into H, gas and O, gas, and the liquid decreases, and then O and gas begin to be efficiently absorbed at the negative electrode. This is from the stage when the total chemical conversion amount reaches 1704. However, in the case where the gel is held in a retainer as in the present invention, the 0° gas is difficult to dissipate upward, so that it easily passes through the gel and comes into contact with the Q negative electrode plate, resulting in a sealed reaction at a conversion amount of 1504. Therefore, it costs P to reduce the liquid! The amount of electricity generated is l 3AhX
If the amount of water is 0.5=6.5Ah, it will be 2.24. In other words, the predetermined amount of liquid to be injected before forming the battery is 32a/+2
．． 2rttl=34.2go.

In the conventional method, the above 2.24 water was separately injected to make an excess liquid, or in the method of the present invention, the retainer part was filled with gel. m
When 1 liter of gel is injected, since it contains 2 or more of water, the overcharge amount can be sufficiently compensated for by the supply from the gel. Therefore,
There is no need for any excess liquid, and if the amount of 1501 is used and the constant current is low, the hermetic reaction will become closer to that of too4. FIG. 1 shows the relationship between the chemical formation voltage, current, and battery liquid amount according to the present invention. As is clear from the drawing, there is little liquid loss;
As shown in Fig. 82, the total amount of liquid retained due to the combined use of a gel retainer is larger than that of the conventional system, so the discharge characteristics are also good.

Also, the chemical conversion process and assembly process are simplified.

The first effect of the invention is that it is possible to form a battery case without considering the amount of liquid to be reduced. ′
In @2, a small amount of current can be applied due to the step-by-step constant current formation. Thirdly, the electrolyte can be uniformly dispersed over the electrode plate. Fourthly, the discharge characteristics were improved due to the increase in the total amount of liquid retained. Fifth, the process can be simplified.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram of a battery case formed according to the present invention, and FIG. 2 is a high rate discharge characteristic diagram of a battery according to the present invention (product of the present invention) and a conventional battery (conventional product).

Claims (1)

[Claims] In a sealed lead-acid battery consisting of a positive electrode, a negative electrode, and a retainer whose main components are glass fiber, the electrode plates are assembled in an unprocessed state and inserted into a battery case, and the electrode plates and retainer are impregnated with the appropriate amount of dilute sulfuric acid. Then, after injecting a sulfuric acid-containing gel containing silica as a main component into the retainer, cell formation is carried out using a constant current in stages, and the potential is controlled to a potential that causes a sealing reaction at the final stage of formation. manufacturing method.