JPH0546064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cathode absorption type sealed lead acid battery.

There are currently two types of cathode absorption type sealed lead-acid batteries: a gel type in which the electrolyte is gelled, and a retainer type in which a mat made of alkali-containing short fibers is pressed together and impregnated with the electrolyte and retained therein. A characteristic feature of the battery is that there is no fluid free liquid outside the electrode assembly. However, the following problems have occurred in the manufacturing of such batteries.

With the gel type, after the initial charge, the electrolyte is drained and the gel is injected, which increases the number of processing steps. In addition, the area around the injection port becomes dirty due to the discharged electrolyte, so washing with water or the like is required.

The gel does not penetrate uniformly between the electrode plates and traps air bubbles. If these air bubbles exist on the surface of the electrode plate, the contact with the electrolyte (gel layer) is cut off at that portion, impairing battery performance.

With the retainer type, if the electrolyte is injected rapidly in the electrolyte injection process prior to the first charge, the electrolyte will not penetrate into the mat's body due to the gas generated by the chemical reaction.
The required amount of liquid cannot be injected. Also, leakage occurs.

There is a risk that the free liquid inside the battery after injection may leak during use.

Requires man-hours to assemble the mat body into the battery.

The present invention solves the above-mentioned manufacturing problems of conventional products.

Examples will be described below with reference to the drawings.

A battery case 2 that houses the electrode plate group 1 assembled by sandwiching the positive and negative electrode plates between the corrugated perforated plates in the assembly process.
First, the necessary electrolyte solution 3 is injected. [Figure 1 B].
Next, a predetermined amount of spheres 4 of about 30 μm made of alkali-containing glass having acid and oxidation resistance are injected [FIG. 1B]. After that, it comes to rest [Figure 1 C]. FIG. 2 shows the internal state of the electrode plate group viewed from the thickness direction during this operation. Even if there is a corrugated perforated plate 5 that prevents contact between the electrode plates, the liquid first penetrates, and then the injected spheres 4 pass through the liquid part and penetrate into the electrode plate group (Fig. 2B). [Figure 2 b]. Since the sphere 4 has a diameter of about 30 μm, it is arranged so as to absorb the irregularities on the surface of the electrode plate.

Regarding the size of sphere 4, the diameter is 100 μm.
If it is larger than this, it will not be arranged so as to absorb the irregularities on the surface of the electrode plate.

Thereafter, as shown in FIG. 1, the battery undergoes an initial charging process, and a valve body is attached to the liquid injection port, resulting in a completed battery.

The battery according to the present invention can fix the electrolyte without using a gel or a mat and is easy to inject, so that the above-mentioned drawbacks of the prior art can be completely solved.

As described above, according to the present invention, the electrolyte is fixed, there is no leakage, and the electrochemical reaction between the electrode plates and the electrolyte is sufficiently performed, improving battery performance and simplifying the manufacture. It has great industrial value.

[Brief explanation of drawings]

Fig. 1 shows the manufacturing state of a sealed lead-acid battery according to an embodiment of the present invention. It shows the manufacturing state of the battery as seen from the thickness direction of the electrode plate group, and A and B are explanatory diagrams of the penetration state of the electrolyte and the penetration state of the spheres, respectively. 2 is a battery container, 3 is an electrolyte, and 4 is a sphere.

Claims (1)

[Claims] 1. A group of electrode plates assembled with positive and negative electrode plates sandwiched between corrugated porous plates is placed in a battery container, the required amount of electrolyte is injected, and then a spherical or hollow body with acid and oxidation resistance with a diameter of 100 μm or less is placed. A method for producing a sealed lead-acid battery, characterized in that the spheres or hollow bodies are injected into the electrolytic solution in the corrugated porous plate and filled.