JPS58198868A - Manufacturing method of enclosed type lead storage battery - Google Patents

Abstract

PURPOSE:To make the oxygen gas absorbable ever so sufficient at the outer side surface of a cathode plate, by disposing a filling plate between the cathode plate located at the end face of a pole group and a battery jar rib, prior to the injection of an electrolyte, while removing the filling plate after the injection. CONSTITUTION:A cathode plate 3a situated at the end face of a pole group 1 consisting of an anode plate 2, a cathode plate 3 and a separator 4 is made to come into contact with a rib 7 installed in a battery jar 6, then a filling plate 8 is disposed in the clearance between 3a and 7, and inserted into th battery jar 6. Next, while the filling plate 8 is left intact, an electrolyte is injected in the jar and absorbed in porosities of the pole group 1, then the filling plate 8 is removed, thus a lead storage battery is made up upon hermetical sealing. Accordingly, since the electrolyte does not flow in the clearance between the cathode plate 3a and the battery jar rib 7 at the time of injecting the electrolyte, the outer side surface of the cathode plate 3a can be coming into contact with the oxygen gas without any obstruction by the electrolyte so that water decomposition in time of charging a large current can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sealed lead-acid battery, and its purpose is to improve the overcharging performance and rapid charging performance of the sealed lead-acid battery.

Various sealed lead-acid batteries have been proposed that utilize a so-called oxygen cycle in which oxygen gas generated from an anode plate is absorbed by a cathode plate, ionized, and returned to the electrolyte as ice. In this type of sealed lead-acid battery, most of the electrolyte is contained within the electrode group so that oxygen gas can easily come into contact with the cathode plate, so that no electrolyte flows freely.

By the way, in this type of sealed lead-acid battery, the oxygen cycle occurs normally when it is overcharged with a relatively small current, but when it is charged with a large current for a short period of time, the oxygen cycle in the cathode plate is This has the disadvantage that the gas absorption capacity does not follow the amount of oxygen gas generated, and the oxygen gas is discharged from the exhaust valve to the outside of the battery, resulting in the end of its life due to liquid reduction.

The present invention has been made in view of the above points, and is intended to make the outer surface of the cathode plate at the end face of the electrode group play a role in absorbing oxygen gas.

That is, in order to make the outer surface of the cathode plate at the end face of the electrode group play a role in absorbing oxygen gas, it is necessary that the outer surface comes into contact with the oxygen gas. By the way, simply providing a rib on the contact surface of the battery case with the outer surface of the cathode plate and creating a gap between the outer surface and the rib of the battery case will result in the injecting of electrolyte during battery manufacture. The electrolytic solution will enter the gap, and oxygen gas will no longer be able to contact the cathode plate.

The present invention relates to a method of manufacturing such a sealed lead-acid battery, which includes a step of disposing a filling plate in the gap between the cathode plate on the end face and the rib of the battery case before injecting the electrolyte, and a step of disposing a filler plate in the gap between the cathode plate on the end face and the rib of the battery case after injecting the electrolyte. The present invention proposes a step of removing the filling plate.

Hereinafter, the present invention will be explained in detail with reference to the drawings showing one embodiment thereof. That is, FIGS. 1 and 2 are a front sectional view and a side sectional view, respectively, showing the time when the electrode group is housed in the battery case. In the drawing, 1 is a group of electrodes, which includes an anode plate 2, a cathode plate 6,
Separator 4 mainly made of glass fiber with a fiber diameter of 1μ or less
and a strap 5 that connects the plates of the same polarity. Further, 6a is a cathode plate located at the end face of the pole group 1. Further, 6 is a battery case, and a rib 7 is provided on the surface thereof that comes into contact with the cathode plate 6a. Furthermore, 8 is pole group 1
It is a filling plate that also serves as a jig for storing the battery in the battery case 6, and has a shape that substantially matches the shape of the gap between the cathode plate 6a and the battery case rib 7. Its thickness is rib 7
It is formed slightly thinner.

That is, the pole group 1 is housed in the battery case 6 while being compressed by the mechanically moving filling plate 8. Next, the electrolyte is injected without removing the filling plate 8. At this time, the electrolytic solution is injected in such an amount that substantially all of the electrolytic solution is absorbed into the pores of the electrode group and does not flow.

Thereafter, the filling plate 8 is removed and the sealed lead-acid battery is completed through predetermined steps such as covering the battery case 6 with a battery case lid.

Since the sealed lead-acid battery according to the present invention is manufactured as described above, the electrolyte does not flow into the gap between the cathode plate 6a and the rib 7 of the battery case 6 at the time of injection of the electrolyte.

Furthermore, even after the filling plate 8 is removed, the electrolyte once absorbed into the electrode group 1 remains retained in the electrode group because the separator 4 is made of a material with extremely high liquid absorbing properties. In this way, oxygen gas can come into contact with the outer surface of the cathode plate 3a without being hindered by the electrolyte, and therefore oxygen gas can be sufficiently absorbed on the outer surface.

Although one embodiment of the present invention has been described above in detail, various embodiments of the present invention can be considered without departing from the spirit thereof.

For example, in the above embodiment, the filling plate 8 also serves as a jig for storing the electrode group 1 in the battery case 6, and is integrated with the electrode group storage device. The filling plate may be independent.

Further, at this time, the filling plate does not need to be inserted into the gap between the cathode plate and the rib at the same time as the electrode group is stored, and may be inserted before or after the electrode group is stored. Further, the filling plate may be removed after extra electrolyte is injected, initial charging is completed, and the excess electrolyte is removed.

Furthermore, by using a filling plate 8' made of a porous material as shown in FIG. 6 as a filling plate, the excess electrolyte is absorbed into the filling plate 8I, and the outer surface of the cathode plate at the end face of the electrode group is wiped. It is also possible to do so.

According to the present invention, oxygen gas can be sufficiently absorbed on the outer surface of the cathode plate 5 on the end face of the electrode group, and water decomposition is small even when charging with a relatively large current, so that the battery can maintain a long service life. It is also possible to improve voltage fluctuations that occur temporarily due to delays in gas absorption.

As described above, the present invention has great industrial value.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a front sectional view and a side sectional view, respectively, showing the point in time when a pole group is housed in a battery case in an embodiment of the present invention. FIG. 3 is a perspective view of a filling plate in one embodiment of the present invention. Applicant Yuasa Battery Co., Ltd. 6-

Claims (1)

[Scope of Claims] 1) A battery case is used which is equipped with an electrode group in which a cathode plate is disposed on the end face, and a rib is provided on the contact surface of the end face with the cathode plate, and the cathode on the end face is A method for manufacturing a sealed lead-acid battery, comprising the steps of: arranging a filler plate in the gap between the plate and the ribs of the battery case; and removing the filler plate after injecting an electrolyte. 2) Method 0 of manufacturing a sealed lead-acid battery according to claim 1, wherein the filling plate is made of a liquid-absorbing material.