JPH04144072A - Electrolyte pouring method for sealed type lead-acid battery - Google Patents

Abstract

PURPOSE:To shorten the time for pouring electrolyte by forming a sealed battery in which the spaces between pos. and neg. electrode plates and around a bunch of electrode plates with silica powder, pressurizing it and expanding, pouring electrolyte to the deformed part, and then putting the battery in decompressed state. CONSTITUTION:Electrode plates 1 in such a construction that glass separators are inserted between pos. and neg. electrode plates are embedded in foaming resin 2 attached together into a box form and are arranged in a battery jar 4. Then gaps between the pos. and neg. electrode plates and spaces around a bunch of electrode plates are filled with silica powder 3. After welding a lid 5 to the battery jar 4. this battery is pressurized and expanded. Then electrolyte 8 is poured into a void 9 produced with deformation of the battery jar 4, which is followed by putting the battery in decompressed state. Then the electrode plates 1, separators, and silica powder 3 are deaerated, and the electrolyte having stayed on the silica powder 3 oversurface or void 9 permeates the silica powder 3 either directly or upon passing through the foaming resin 2, and at the same time, the electric jar 4 in expansion returns to the original dimension. Thus electrolyte pouring is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an improvement in a method for pouring electrolyte into a sealed lead-acid battery.

BACKGROUND OF THE INVENTION There are two types of sealed lead-acid batteries that use a negative electrode to absorb oxygen scum generated during battery charging: a retainer type and a gel type. In the retainer type, a mat-shaped separator (glass separator) made of crow fiber is inserted between the positive electrode plate and the negative electrode plate. In recent years, it has become widely used as a power source for portable devices and computers.However, the retainer type is
Due to the high cost of the battery and the inability to hold a sufficient amount of electrolyte, low-rate discharge is limited by the discharge capacity or the amount of electrolyte, which is an obstacle to the widespread use of this type of sealed lead-acid battery. ing.

On the other hand, the gel type has disadvantages in that it is cheaper than the retainer type or its battery performance is inferior to the retainer type.

f# at the time of carbon dioxide as a new electrolyte holder that overcomes these drawbacks of caged and gel-type sealed SQW batteries.
It has been proposed to use (silica) powder. Batteries that use this silica powder, especially granulated products, as an electrolyte holder have superior high-rate discharge performance than conventional retainer-type batteries, and are superior to gel-type batteries in low-density discharge performance. However, when this silica powder is used as an electrolyte holder, problems particularly in the manufacturing process have become apparent.

One of the problems is that it takes a long time to hold the sulfuric acid electrolyte in the silica powder. This is thought to be due to the large size.

Means for Solving the Problems The present invention solves the above-mentioned problems and describes a sealed 4HH storage battery that is highly productive, inexpensive, and has excellent discharge performance. In this case, a bridge plate group consisting of a separator inserted between the positive electrode plate and the negative electrode plate is stored in a battery case, and silica powder is applied to the gap between the positive electrode plate and the negative electrode plate and around the electrode plate group. Filling the body Arrangement 1-1 After welding the battery case and the lid, the battery is pressurized and expanded, and after injecting electrolyte into the deformed part, the battery is depressurized, and the electrolyte is poured into the battery case. The method for electrolyzing a sealed lead-acid battery, which is characterized by plasticity, includes an inner box made of a porous material with open cells that allows air to pass through but not silica powder.

The present invention will be explained below based on examples.

Exception: Gate with diameter size 150" x 370" in -Ca-
After filling positive electrode and negative electrode grid bodies made of 3n alloy with normal positive electrode and negative electrode pastes, respectively, they were aged to produce unformed electrode plates. Then, an element was assembled using 8 positive electrode plates, 0 negative electrode plates, and a glass separator with an average fiber diameter of 7%, 145 L x 1.
A box-shaped piece of foamed resin with a thickness of about 5n+i with open cells bonded to the inner wall of a 60" x 410' nn resin battery case was fabricated at -F for 1°, and the above-mentioned element was assembled. After storing it in this, fix it to the vibrator,
60H2, 7509 silica powder was filled without applying 3G vibration. Next, the lid was welded and the terminal portion was sealed. First, we will explain the liquid injection method according to 6J of this year based on the drawings.

Figures 1 and 2 are schematic cross-sectional views of the main parts of f: for explaining the injection method.
Resin, 3 is silica powder, 1 is a battery container, and 5 is a boiler. When air is introduced through the injection port 6 of a two-capacity battery to raise the internal pressure of the battery by 0.3 K(]/CI' above atmospheric pressure, the battery case 671 expands as shown in Figure 2, and the maximum amount of deformation is It was about 20% of its original size on the sides, and about 5°0 on the bottom of the battery case.The deformation of the battery case was probably different from when pressurization was applied, either because the pressure was stopped and the internal pressure of the battery was returned to atmospheric pressure. When 50p of electrolyte 8 is injected from the electrolyte container 7, the electrolyte first penetrates into the silica powder, but the penetration rate is much slower than the injection rate of the electrolyte, so the electrolyte is absorbed into the silica powder. The powder accumulated in the opening surrounded by the resin, and eventually overflowed and flowed into the gap 9 created by the deformation of the battery case. g, /C1
If you continue to reduce the pressure from the injection port when the temperature reaches 12, the air contained in the silica powder will be degassed overnight due to the electrode plate and separation.
The electrolytic solution that had accumulated on the surface of the silica powder or in the voids 9 penetrated into the silica powder either directly or through the foamed resin 1-2.At the same time, the battery case 4, which had expanded, was returned to its original state as shown in Figure 1. The method C5 Nifu Ri〆 main liquid was completed.

For comparison with the liquid injection method according to the present invention, the time required for this series of liquid injection operations is as shown in FIG. Set up a container, connect one side of the three-way connector to a figure-9 pump, and reduce the pressure to -08g/C1'' at 1-1 to the internal pressure of the battery or atmospheric pressure, then switch the self-container. Measurements were made using the conventionally used H method in which electrolyte is injected using a zoom lens.The base of this term is shown in Table 1.The time for wearing the equipment, etc. was included in the time for each item.

As is clear from Table 1, 1. By using the method according to the present invention, the total time required for dispensing the electrolyte can be reduced to about 1.8 times the conventional method. In the conventional method, the electrolyte did not enter with one evaporation and injection operation, and it was 7 to 10 minutes.
Multiple operations were required.

It has been found from experiments that there is a relationship T=KA2 between the injection time T of electrolyte into silica powder and the permeation distance p. Here, K is a term determined by the viscosity of the electrolytic solution and the pressure difference between the inside and outside of the container containing the silica powder.

Since the method according to the present invention simultaneously injects liquid from the top, bottom and four sides of a rectangular parallelepiped filled with silica powder, it is possible to reduce the amount p required to inject a predetermined amount of electrolyte. On the other hand, in the case of the conventional method, the electrolyte penetrates only from the top surface, p corresponds to the height of the electrode plate group, and it takes a long time to pour the electrolyte.

In addition, if the positive and negative electrode plates of a lead-acid battery generate Pt1CO3 while left unused, this will react with the electrolyte during injection and generate C02. Therefore, in conventional methods, the pressure inside the battery is reduced (and this error occurs).
The efficiency was poor, as the internal pressure increased due to CO2, or the electrolyte that had penetrated from the top was pushed back due to the generation of CO2. In the method according to the present invention, even if CO2 is generated, the internal pressure of the battery will not increase because the battery is constantly depressurized by a vacuum pump during injection, and even if the penetration of electrolyte from the top surface is inhibited, the battery will not increase the internal pressure. Penetration is possible from the bottom.

Effects of the Invention As described above, according to the present invention, the time required for pouring electrolyte into a sealed lead-acid battery in which silica powder is filled and arranged between the positive and negative electrode plates and around the electrode plate group can be significantly shortened. I can do it.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic cross-sectional views of main parts for explaining the liquid injection method according to the present invention, and FIG. 3 is a schematic cross-sectional view of main parts for explaining the liquid injection method according to the conventional method.

Claims (1)

[Claims] 1. Place the electrode plate group, which is made by inserting a separator between the positive electrode plate and the negative electrode plate, into a battery case with an inner box made of a porous material with open cells that allows the electrolyte and air to pass through, but not the silica powder. Store and
Silica powder is filled and arranged in the gap between the positive and negative electrode plates and/or around the electrode plate group, and after welding the battery case and lid, the battery is pressurized and expanded, and electrolyte is injected into the deformed part. A method for injecting electrolyte into a sealed lead-acid battery, which is characterized in that the battery is brought into a reduced pressure state.